Squashed 'src/leveldb/' changes from f545dfabff4c2e9836efed094dba99a34fbc6b88..f8ae182c1e5176d12e816fb2217ae33a5472fdd7

f8ae182c1e5176d12e816fb2217ae33a5472fdd7 Adds unicode support to Windows environment.
92ae82c78f225de84040c51e07fd0b4a61caed99 Increase maximum read-only mmap()s used from 1000 to 4096 on 64-bit systems
d42e63d49d9df05b12cd00af4ffc5f2b3edf7e21 Do not crash if filesystem can't fsync
bf2c2090b7ee12c5d85b85f08649b6e685f8715f Add filename to corruption errors
0c40829872a9f00f38e11dc370ff8adb3e19f25b Remove redundant PROJECT_SOURCE_DIR usage from CMake config.
5abdf4c019e51fce59d34c21b13bf4e0a948828a Fix installed target definition.
cf4d9ab23de7ec36b8e00536b7450f02c639cd87 Test CMake installation on Travis.
95d0ba1cb046bfd76619b8b80e14ee1b2897d219 Renamed local variable in DBImpl::Write.
657ba514298a726c7533f3106d3778062b59d75f Added return in Version::Get::State::Match to quiet warning.
370d532a00581ca79c87af7d7811e56de0ca52a8 Using CMake's check_cxx_compiler_flag to check support for -Wthread-safety.
45ee61579c1eb3accd6c88c922ec468dd61beea8 Update Travis CI configuration.
60db170a43a373d734c5b9f19693d36c75251c39 Fix tsan problem in env_test.
21304d41f77990b8edabbdab33b222bd5ceb5f18 Merge pull request #698 from neal-zhu:master
5e921896eedf87b0fb06bc8a1fd0991b9ac64131 drop fileds in State that are duplicates of fileds in Saver and fix typo
53e280b56866ac4c90a9f5fcfe02ebdfd4a19832 Simplify unlocking in DeleteObsoleteFiles.
046216a7ca6fb17a40cf8aa5598d90c825212a3d Add "leveldb" subdirectory to public include paths.
9ee91ac747ddf26f484d54f9aa474ccc4a2e0359 Ending sentences with periods in README.md.
e0d5f83a4f80060fe5b5d80025f0ad049bca430e Align EnvPosix and EnvWindows.
69061b464ab1da287da9b7ffec1ed911b754403b Disable exceptions and RTTI in CMake configuration.
107a75b62c19cce901ce10619b63c4b7acc9a0be cache Saver in State object
76ca1162768e5c89f1a49946a1f286c702ae27ae fix bug(uninitialized options pointer in State)
f668239bb262609146496b854e1ec3cea9cd1a83 remove TODO in Version::ForEachOverlapping
177cd08629883c409f7a01f90f7084bc5518f1ef format
8fa7a937ee8f38d8869357b0f27f120c5c58f4c9 fix bug
6a90bb91ee72642241fdbeefa673f88370c7b245 use ForEachOverlapping to impl Get
4cb80b7ddce6ff6089b15d8cfebf746fc1572477 Merge pull request #386 from ivanabc:master
72a38ff7f206b3924ac009a12a1838d6a0bdab03 Replace "> >" with ">>"
863f185970eff21e826e5fe1164a6215a515c23b unsigned char -> uint8_t
a3b71c1ff65e30ced00e85ebbca9ae5786af6626 Use GCC 9 on Travis CI
ae49533210e96bdee9c9479a7fa547f375a39c8b Add explicit typecasts to avoid compiler warning.
63d5315e1c224e52da8ec68d118c5b73ba2a63fc Merge branch 'master' into master
c00e177f3613068eda4bff4abfbd3bd4165a86e8 Guard DBImpl::versions_ by mutex_.
1d0b101165ddd34f26cc5c62b76f2a2e0d622483 Converted two for-loops to while-loops.
28e6d238be73e743c963fc0a26395b783a7565e2 Switch to using C++ 11 override specifier.
85cd40d108d8f8d91f58fd263c0f8428d11c34d5 Added unit test for InternalKey::DecodeFrom with empty string.
1aae5c9f29ea43ceca745efae012c4aa731e9374 Merge pull request #411 from proller:assert1
b7b86baec9ce47569affc5db54a20a6cc520e0f0 Using std::ostringstream in key DebugString.
3e6c000e18519cb22e0a44d0dea45b34daee4ee1 Merge pull request #457 from jellor:patch-2
1d94fe2f4d1dfdf1a6312bf4b36efcbe0c1bf576 Merge branch 'master' into patch-2
27dc99fb2642cadc87c9aaec82c54a2c725ee0d6 Fix EnvPosix tests on Travis CI.
9521545b062841409cf66eff0655feff09d9fd82 Formatting changes for prior O_CLOEXEC fix.
900f7d37eb3224059dd37afc6614d3158ddaeb8d Merge pull request #624 from adam-azarchs:master
a7528a5d2bd29126b60a277b528ed606b67c1771 Clean up util/coding.{h,cc}.
142035edd4b1ab431c0ecbd547d4a77f1eca0667 Initialize Stats::start_ before first use in Stats::Start().
e22b1cec6e1e0e2dec4c93b658acbfc56fb692c0 Merge pull request #365 from allangj:c-strict-prototypes
cd1ec032cd276409ba403cab4d0b2548dd26b890 Add argument definition for void c functions.
4bd052d7e8b0469b2b87664388e2a99cb212ecdb Consolidate benchmark code to benchmarks/.
506b1722ef1a58d87325575d9bbcd3c8869381c7 Convert missed virtual -> override in db_test.cc.
24424a1ef2c284f4ec30544a3458023362cbeacd Style cleanup.
9a56c49ed415df1b72ba1c84c8e7ed00de497f68 Merge pull request #679 from smartxworks:optimize-readseq
abf441b657c7e75091e2bd59449df6849358b812 Merge pull request #278 from wankai:master
78b39d68c15ba020c0d60a3906fb66dbf1697595 Bump the version number from 1.21 to 1.22.
9bd23c767601a2420478eec158927882b879bada Correct class/structure declaration order.
c784d63b931d07895833fb80185b10d44ad63cce Moved port/README to port/README.md.
297e66afc1dda3f3d7a7cc2022030164c302cb7a Format all files IAW the Google C++ Style Guide.
3724030179716fd8d95cf79339884c49afade8f9 Update Travis CI configuration.
d3d1c8a0f40a7eaa12a5bb702fa01786b7c3a646 don't check current key in DBIter::Next()
3dc9202f78a3eb30ee8c0267e4e4be2e3f986e45 [leveldb] Specifically export the WriteBatch::Handler inner class for Windows link
2ccb45c33aecd8b15000c0c622f45eb119b6b478 Check for possibly invalid offset in test.
7b1174519044339f07a023dc445b0d36425bd6db Changed Windows specific highlighting from bash to cmd.
2f008ac19ec783e4d0ba2161320241c99e9897e1 Initialize class members to default values in constructors.
ffabb1ae86cc4eb4516a7c0824c878c3b2d19e5d Merge pull request #665 from cheng-chang:coding
7da571cf2b954a107fa060698bfbfbba8e8318f8 Merge pull request #669 from pavel-pimenov:fix-readme-windows-mkdir
df4a323aafbf65996fec23de8b2dbb9d7e27ae11 Merge pull request #472 from zhoudayang:patch-1
5a2a472741f36ecf5b994439da5a64c6ab90c47f Fixed missing std namespaces and make_unique.
08e771901f454ac32643bd8e8cb2bcfa08026c0c Simplify issue320_test.
65e86f75ea30e44bc65327f92a16328684269acb Fix formatting of recent snapshot compaction fix.
7711e76766231bf93e0487c4530b2655e8c4c0b1 Merge pull request #339 from richcole-at-amazon:master
71ed7c401ec1b1e38d6f7cb9eb2fcff93c24d1f1 Fixed typo in comment in version_set.h.
09fa8868dbe0cb2701f0560c59ebb63cc17f1271 Align version/soversion CMake setup closer with other repositories.
20fb601aa9f68ff0aa147df22524b7d01758552b Fix snapshot compaction bug
37300aa54b8256dd2edfd504942eb2bd20823647 Restore soname versioning with CMake build
952be04df6edb936b8f7d0f652861100a7f61e97 Fix mkdir (windows)
56178ddaf4d3ba6c8d1cfb218610b1be3f5aa710 Update the version to 1.21 in preparation for a new release.
35619d248d909b197f68226c7d0a9ff947b82e8a Project import generated by Copybara.
416344de2fdffb3f17c565b984885d0122bfa1e9 leveldb: Register in copybara whitelist.
da94ac67e91679842a56a876f0b19b429d72de25 leveldb: Minor cleanup in ports.
bd24b963060861518c6648925f9708178562c992 leveldb: Silence unused argument warnings in MSVC.
6188a54ce95b47cc6bd398d7f2eb45d061857e45 leveldb: Add tests for empty keys and values.
cf1b5f473259e46c667f3fb5a28bcd884ee3a102 Remove unnecessary bit operation.
7035af5fc36657447054617759854a726d31dbe0 Two small fixes for the Windows implementation (#661)
6571279d6de21fe33caa31b2ea4170d34b15b10e fix a typo in the comment of skiplist_test.cc (#664)
15e227896621d01ebad4c5d4b3cc82a7a9b5b30b Use override consistently in leveldb::test::ErrorEnv.
ea49b27d062c4bc998616cef7944f7f9088a327d Switch corruption_test to use InMemEnv.
ce399ac28af7023b1aff0ede4986cb6d89b3c0b5 Always copy bytes to scratch buffer when reading w/MemEnv.
201f77d137f30ea46e789a2ad60e9119b6f990fc Inline defaults in options.
9ce30510d482f5b2fa2965201453f0fc914f700c Deleted dangling reference to deleted atomic_pointer.h.
7d8e41e49b8fddda66a2c5f0a6a47f1a916e8d26 leveldb: Replace AtomicPointer with std::atomic.
dd906262fd364c08a652dfa914f9995f6b7608a9 Make InMemoryEnv more consistent with filesystem based Env's.
cf1d1ab255de2a741695aec53d83e4f808f9e819 leveldb: Remove unused file port/win/stdint.h.
a20508dc6a18a34e05a6fc476a8d587fa9bb6608 Fix typo (#565)
04470825ac96cab0d9d16e4ed410349d082fbf82 Add AppVeyor (Windows CI) badge to README.
ed76289b259d42d0a57c147e791e2c235ed28805 Align windows_logger with posix_logger.
808e59ec6a160244960cda64b393968ffbdae72c Improve CI configuration.
c69d33b0ec3dad2a8063ad66da9d51a1d6309f4e Added native support for Windows.
75fceae7003e217e16b04433831da7528ae56881 Add O_CLOEXEC to open calls.
fe4494804f5e3a2e25485d32aeb0eb7d2f25732e leveldb: Make WriteBatch::ApproximateSize() const.
296de8d5b8e4e57bd1e46c981114dfbe58a8c4fa leveldb: Fix PosixWritableFile::Sync() on Apple systems.
b70493ca8586285b49e9888e2b528f71806bdc6e Fix fdatasync() feature detection in opensource build.
af7abf06ea061222c2c34d98e1995c5a901f374f Add back space to POSIX Logger.
58d70545af9ec7f30821f973b604f8e2a2f9ebdb Update Travis CI configuration.
1cb384088184be9840bd59b4040503a9fa9aee66 Clean up env_posix.cc.
a7dc502e9f11c2e5c911ba45b999676c43eaa51f Rework once initialization in env_posix.cc.
c43565dd398b2233db8eb49ba05234d62fb42e03 C++11 cleanup for util/mutexlock.h.
0145a94ab6bec48e596df499e8f6103e138a74ab Update .gitignore.
73d5834eceee8efa9a8ccfec77dc096a9e8ba18a Rework threading in env_posix.cc.
05709fb43eea34936c9f535edcb74d5e91a0b495 Remove InitOnce from the port API.
bb88f25115d20a6d73dfb6b16cc298db2f66948b Clean up PosixWritableFile in env_posix.cc.
7b945f200339aa47c24788d3ee9910c09c513843 Clean up posix_logger.h.
89af27bde59fbbb3025653812b45fec10a655cb7 Remove ssize_t from code that is not POSIX-specific.
03064cbbb2c00c3e6e41a78e8111d14a020f7d6f Simplify Limiter in env_posix.cc.
9b44da73d9b1d839c437e3fdaaa14ea08260dce4 Clarify comments for leveldb::Env file reading methods.
0ef2310f67f0c0b4ba3e6ad86d8138440af30d67 Remove GCC on OSX from the Travis CI matrix.
16a2b8bb3af5b1f54676256e55a5d3f0ec02da42 Expose WriteBatch::Append in the C API.
f7b0e1d901da26ac5ce6ad7f0a9806ce1440197e Expose WriteBatch::Append().
6caf73ad9dae0ee91873bcb39554537b85163770 Clean up Iterator.
6a6bdafcf10f5d4bef1ca52697c38d10c28b1a8b Corrected typo in docs: "cache" to "block_cache".
18683981505dc374ce29211c80a9552f8f2f4571 Clean up SnapshotImpl.
e7840de9f3db1a5eddedfecbbbc1ff72a4c2631a Fix documentation for log file growth.
bc23e00f955eadb9e26f8ce07c1c664e7b985ff0 Update default log file size in doc.
4de9594f6fbfd69043239a5705b5f32065f02d34 Add move constructor to Status.
d177a0263cce4344d05188521ad53459c369b940 Replace port_posix with port_stdcxx.
14cce848e7b8a040a8f457d5a796722a55e19597 Fix sign mismatch warnings in GCC.
8046a51b21114d3575421bfc78b1d98b1678720a Add forgotten <limits> header to util/logging.cc.
a0008deb679480fd30e845d7e52421af72160c2c Reimplement ConsumeDecimalNumber.
1f7dd5d5f6822f2b0b9f9e4c7d87d4535c122c0e Add tests for ConsumeDecimalNumber.
1cc8b10b8232e174d5bd1313959825727e03faa7 Document the building process.
09217fd0677a4fd9713c7a4d774c494a7d3c1f15 Replace NULL with nullptr in C++ files.
6a3b915166fce75aaf9ac209114a3ad9caa34171 Remove PLATFORM_IS_LITTLE_ENDIAN from port/posix.h.
260655b4c294991fe03bf6ab8b6d722ccfc41d32 Define LEVELDB_HAS_PORT_CONFIG_H for old compilers.
6fa45666703add49f77652b2eadd874d49aedaf6 Rename CMake project / targets from Leveldb to leveldb.
0db30413a4cfa8c980e675ba5cb96717d688af92 leveldb: Add more thread safety annotations.
04f39105c5a418905da8b7657ca244d672c99d3b Take <atomic> for granted in port/atomic_pointer.h.
74f032ff6f2465160366d865b1bb89a45dc2046b leveldb: Require C++11.
8e75db8623703cdc25ec3cd06f82129296672489 Remove build configuration for make.
df9a841a4fc9a04c7713542d75f50e749fb64b7b Add export.h to CMakeLists.txt
50fbc87e8c62a816d6afd4740e0652a13ac6dc3e Replace SIZE_MAX with std::numeric_limits.
739c25100e46576cdcdfff2d6f43f9f7008103c7 Add CMake build support.
0fa5a4f7b1ad9dc16b705bcad1f3ca913f187325 Extend thread safety annotations.
8143c12f3fc483b1ba61cdce11f9c1faf6d01bea Fix includes in util/testharness.h.
aece2068d7375f987685b8b145288c5557f9ce50 Remove extern from function declarations.
ddab751002588fe58955357d68d12b062e038d0d Add tests for {Old}InfoLogFileName().
7fd7c0072159abbca2660d91fc0667d5c17c4d16 Remove unused function ExtractValueType.
594cc987af2e0af6417c4ac2b947ee8cdad59e5e Bypass OSMemoryBarrier() warning on Mac.
49f35d3fc940a1e2d599d6ee3306eeb31a205e4b leveldb: Update Travis CI configuration for open source build.
623d014a54f8cf9b74ad6aaba9181ca1e65c43a1 Expose Env::GetTempDirectory() for use in C test.
8c8024ea33d8efc8c415597fb7fa1745002961d6 Switch HAVE_ library detection macros to 0/1.
41172a24016bc29fc795ed504737392587f54e3d Enable thread safety annotations in open source version.
47cb9e2a211e1d7157078ba7bab536beb29e56dc Add leveldb_options_set_max_file_size to the C API.
b5d4a22e64c7a6615b412f464026c808b58b1d34 Fixed style guide link in CONTRIBUTING.md
3da4d8b9899257386aeb5ffa345a6477c62ff7bf Deleted unused assignments in Reader.
0509414f858ae7c7225e29f3659a709afb324355 leveldb::DestroyDB will now delete empty directories.
23162ca1c6d891a9c5fe0e0fab1193cd54ed1b4f Fix typo (forgotten reference operator) in test.
5c39524f3639e6bf6ab49215152d24273e662986 Replace SSE-optimized CRC32C in POSIX port with external library.
ca216e493f32278f50a823811ab95f64cf0f839b leveldb: Rename SNAPPY to HAVE_SNAPPY.
25767d066ca995c055f04b78a31a6e518087e667 leveldb: Remove *_unlocked feature detection from POSIX port.
4a7e7f50dcf661cfffe71737650b0fb18e195d18 Add LEVELDB_EXPORT macro to export public symbols.
542590d2a8eee3838f40b01405baa6d2f6f8c700 leveldb: Include <algorithm> in util/env_test.cc.
8ae7998aabae4f208d77afcb930dafabade1b28d Fix FD leak in POSIX Env.
d9a9e02edf2b8187aa481416b36c49710026ab37 leveldb: Add tests for CL 170769101.
4447f9caced2bd09585c90f1b203c3aa8f4bbc40 Remove handling for unused LRUHandle representation special case.
2372ac574fdeb1235e70cdd86a2681d1ce05cf65 Fix file writing bug in CL 170738066.
1c75e88055e06da2939f9f4bd294625b76792815 Fix use of uninitialized value in LRUHandle.
7e12c00ecf1bb725e212618e7026e4d34d6cd3bb Fix issue 474: a race between the f*_unlocked() STDIO calls in env_posix.cc and concurrent application calls to fflush(NULL).
bcd9a8ea4a8aad23a3e101a23c61615bab2a093f Use portable CRC32C from google/crc32c.
ea0a7586b8615fd39c6b8f5a8a21a1f242129c2f Remove confusing and unnecessary if.
141e7671359d5e6c65ff70460774b53b94371df1 Simplify Table::Open() flow and remove a delete call.
09a3c8e7417547829b94bcdaa62cdf9e896f29a9 Switched variable type from int to uint64_t in ConsumeDecimalNumber.
2964b803b857932ff7499d7bebb61dc5514dab7c leveldb: Fix alignment code in SSE4.2-optimized CRC32C.
02f43c0fcde39823830493503e8a3f72fed43d24 Remove dead code.
0b402e96a76b19cd98e82402de636449a2613228 Use __APPLE__ instead of OS_MACOS. The former is compiler-provided.
8415f00eeedd96934d3578572d3802900e61a556 leveldb: Report missing CURRENT manifest file as database corruption.
69e2bd224b7f11e021527cb95bab18f1ee6e1b3b LevelDB: Add WriteBatch::ApproximateSize().
471f0b84ec3420c7565511eb6e2fee8e0a0550e8 fix comment
5b817400a0a5afe3badbb8859706a571882ababc fix comment
7d060117fa0d5cab7cb15b0cf127533bea9ffbc7 broken db: fix assertion in leveldb::InternalKey::Encode, mark base as corrupt
2883fcd849ca7b479d8a2f4fc929f0b6c7b9e372 set const property
e5f0a51fa44115fb083c1e71d5ddcd07a7aba719 reduce lock's range in DeleteObsoleteFiles
dd598676cd655dc2a2aaef47715ce18175d4a550 block_builder header file dependency fixed
REVERT: f545dfabff4c2e9836efed094dba99a34fbc6b88 Merge #18: Use utf-8 to decode filename
REVERT: f8e797a058b7a3993314e985dfdff8124214ba99 Use utf-8 to decode filename
REVERT: 2fc114812a04e6b88852fa37eedc556a464241f7 Merge #14: Fixes to allow building with msvc.
REVERT: 524b7e36a8e3bce6fcbcd1b5df09024283f325ba Merge #19: Increase maximum read-only mmap()s used from 1000 to 4096 on 64-bit systems
REVERT: 4874cb8d3e1dc7b9026b9faf51b9282c91f8ef40 Increase maximum number of read-only mmap()s used from 1000 to 4096 on 64 bit systems.
REVERT: 64052c76c567cff3dad32d1db0ef969d97b5882f Merge #15: Add filename to corruption errors
REVERT: 135ed0fb4e5d6440b174c4b80c147e915dd58969 Add filename to corruption errors
REVERT: d6eab93138884ee6c466fad5dadf2a1bfeb7cffd Fixes to allow building with msvc.
REVERT: c521b3ac654cfbe009c575eacf7e5a6e189bb5bb Merge #11: fixup define checks. Cleans up some oopses from #5.
REVERT: 8b1cd3753b184341e837b30383832645135d3d73 fixup define checks. Cleans up some oopses from #5.
REVERT: 6b1508d6d58caabf76cec2688b3428c9070b7bc9 Merge #6: Fixes typo
REVERT: fceb805426c66c8b79e2d75b83b4a35c57ad3a6e Merge #10: Clean up compile-time warnings (gcc 7.1)
REVERT: 0ec2a343f3be66ef6e25f9b9badc0256ac0911b7 Clean up compile-time warnings (gcc 7.1)
REVERT: d4c268a3571a66b3712ad24dfaf4b9f9671bcdf2 Merge #5: Move helper functions out of sse4.2 object
REVERT: 8d4eb0847041a26377dc99b1c4fb5c22d4841d5e Add HasAcceleratedCRC32C to port_win.h
REVERT: 77cfbfd250a690978a3b81d364054039467ed549 crc32: move helper functions out of port_posix_sse.cc
REVERT: 4c1e9e01688864a32217e541102fa8d2df9a3d59 silence compiler warnings about uninitialized variables
REVERT: 4953164851d1bc2fc653f60a98df5aa5c1dfcebd Merge #2: Prefer std::atomic over MemoryBarrier
REVERT: 2953978ef8cd8f0babcac86a52f5c688a5ad8fa8 Fixes typo
REVERT: f134284a1ce6e8e3ccc375a0a44300d9a87c51ab Merge #1: Merge upstream LevelDB 1.20
REVERT: 196962ff01c39b4705d8117df5c3f8c205349950 Add AcceleratedCRC32C to port_win.h
REVERT: ba8a445fdaa7cf3cb888a151e055330483b946f6 Prefer std::atomic over MemoryBarrier
REVERT: 1bdf1c34c5d903e466673a15103124568d995db4 Merge upstream LevelDB v1.20
REVERT: d31721eb0a115ac55506bb6735034bf915adc914 Merge #17: Fixed file sharing errors
REVERT: fecd449021504dc647c1a1226d72ab0d5efb84ad Fixed file sharing error in Win32Env::GetFileSize(), Win32SequentialFile::_Init(), Win32RandomAccessFile::_Init() Fixed error checking in Win32SequentialFile::_Init()
REVERT: 5b7510f1b79d9af1c5fe272a4587517a2579d3b7 Merge #14: Merge upstream LevelDB 1.19
REVERT: 0d969fd5708c9fd559d63be28664e1e840beb8ca Merge #16: [LevelDB] Do no crash if filesystem can't fsync
REVERT: c8c029b5b5793d3c9afef34afa53d10a910adf4e [LevelDB] Do no crash if filesystem can't fsync
REVERT: a31c8aa408d5594830f7cb20ead1ef1dff51b79e Add NewAppendableFile for win32 environment
REVERT: d40bc3fa5aaa5438d4d8f55ee83e6b3cd161ce02 Merge #13: Typo
REVERT: ebbd772d33d8596e5765a4d1251308d732d61355 Typo
REVERT: 1913d718ef8b07288229a75553862fcb343bf3ab Merge upstream LevelDB 1.19
REVERT: 20ca81f08fb7fa108923a091668e447dcf5c6b9d Merge pull request #9
REVERT: 7aa105e1a34e6e52b1e0de16d9d659a2af26fa0a leveldb: Win32WritableFile without memory mapping
REVERT: 7d41e6f89ff04ce9e6a742932924796f69c6e23d Merge upstream LevelDB 1.18
REVERT: 42dcc7edfc98c50038e4604fa630c626db17bf42 Merge upstream LevelDB 1.17.
REVERT: e991315d7fe4ca84a98902578106cbffa3dcccfd Merge upstream LevelDB 1.15.
REVERT: 02ac9f170b1c47e2c613cd47b8d7da45743af575 Merge upstream LevelDB 1.14.
REVERT: 936b4613ea4551992e6096b1e05eeefc09a20e3b Merge upstream LevelDB 1.13.
REVERT: be1b0ff1fcd6ad820a7fd111ac671fb51cc68001 On Mac OS X fsync does not guarantee write to disk. Use fcntl F_FULLFSYNC instead.
REVERT: a02ddf9b14d145e88185ee209ab8b01d8826663a Added GNU/kFreeBSD kernel name (TARGET_OS)
REVERT: 848746862caf337254a8a3e3a6bd3fa355db4fc8 CondVar::SignalAll was broken, leading to deadlocks on Windows builds. http://code.google.com/p/leveldb/issues/detail?id=149
REVERT: f6d84d1baf74a15ee8a0f73a81c647058bf816e9 Allow files to be opened for reading multiple times
REVERT: cb8e3f7adfaa48e09fb7a467086d69e4b6f948bd Checking whether closing succeeds
REVERT: d5317e8eda06d8dbbf04f08866c92323ccdbb43f Print actual Win32 error that occurred on file creation failure.
REVERT: 907f3084998fa4ce96b7abc6d9b12c7aa7b81c8c Port leveldb to MinGW32
REVERT: 9def2bfbf18dfbc0c3c95e90c91f043a6de3c1cb Mingw support for Windows LevelDB port
REVERT: 0a7b0748c71e64fd920eed94c26d69bc9ae77870 Pre-Vista leveldb::port::InitOnce implementation
REVERT: 31a2b09985842c833fbbd81e17f207c377217754 Native Windows LevelDB port
REVERT: 058a0357cd9650b214a199f81669a07d3eb4a298 Remove Snappy support

git-subtree-dir: src/leveldb
git-subtree-split: f8ae182c1e5176d12e816fb2217ae33a5472fdd7

.appveyor.yml

@@ -0,0 +1,35 @@
+# Build matrix / environment variables are explained on:
+# https://www.appveyor.com/docs/appveyor-yml/
+# This file can be validated on: https://ci.appveyor.com/tools/validate-yaml
+
+version: "{build}"
+
+environment:
+  matrix:
+    # AppVeyor currently has no custom job name feature.
+    # http://help.appveyor.com/discussions/questions/1623-can-i-provide-a-friendly-name-for-jobs
+    - JOB: Visual Studio 2017
+      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      CMAKE_GENERATOR: Visual Studio 15 2017
+
+platform:
+  - x86
+  - x64
+
+configuration:
+  - RelWithDebInfo
+  - Debug
+
+build_script:
+  - git submodule update --init --recursive
+  - mkdir build
+  - cd build
+  - if "%platform%"=="x64" set CMAKE_GENERATOR=%CMAKE_GENERATOR% Win64
+  - cmake --version
+  - cmake .. -G "%CMAKE_GENERATOR%"
+      -DCMAKE_CONFIGURATION_TYPES="%CONFIGURATION%"
+  - cmake --build . --config "%CONFIGURATION%"
+  - cd ..
+
+test_script:
+  - cd build && ctest --verbose --build-config "%CONFIGURATION%" && cd ..

.clang-format

@@ -0,0 +1,18 @@
+# Run manually to reformat a file:
+# clang-format -i --style=file <file>
+# find . -iname '*.cc' -o -iname '*.h' -o -iname '*.h.in' | xargs clang-format -i --style=file
+BasedOnStyle: Google
+DerivePointerAlignment: false
+
+# Public headers are in a different location in the internal Google repository.
+# Order them so that when imported to the authoritative repository they will be
+# in correct alphabetical order.
+IncludeCategories:
+  - Regex:           '^(<|"(benchmarks|db|helpers)/)'
+    Priority:        1
+  - Regex:           '^"(leveldb)/'
+    Priority:        2
+  - Regex:           '^(<|"(issues|port|table|third_party|util)/)'
+    Priority:        3
+  - Regex:           '.*'
+    Priority:        4

.gitignore

@@ -1,13 +1,8 @@
-build_config.mk
+# Editors.
-*.a
+*.sw*
-*.o
+.vscode
-*.dylib*
+.DS_Store
-*.so
+
-*.so.*
+# Build directory.
-*_test
+build/
-db_bench
+out/
-leveldbutil
-Release
-Debug
-Benchmark
-vs2010.*

.travis.yml

@@ -1,13 +1,82 @@
+# Build matrix / environment variables are explained on:
+# http://about.travis-ci.org/docs/user/build-configuration/
+# This file can be validated on: http://lint.travis-ci.org/
+
 language: cpp
+dist: bionic
+osx_image: xcode10.3
+
 compiler:
-- clang
 - gcc
+- clang
 os:
 - linux
 - osx
-sudo: false
+
-before_install:
+env:
-- echo $LANG
+- BUILD_TYPE=Debug
-- echo $LC_ALL
+- BUILD_TYPE=RelWithDebInfo
+
+addons:
+  apt:
+    sources:
+    - sourceline: 'deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic-9 main'
+      key_url: 'https://apt.llvm.org/llvm-snapshot.gpg.key'
+    - sourceline: 'ppa:ubuntu-toolchain-r/test'
+    packages:
+    - clang-9
+    - cmake
+    - gcc-9
+    - g++-9
+    - libgoogle-perftools-dev
+    - libkyotocabinet-dev
+    - libsnappy-dev
+    - libsqlite3-dev
+    - ninja-build
+  homebrew:
+    packages:
+    - cmake
+    - crc32c
+    - gcc@9
+    - gperftools
+    - kyoto-cabinet
+    - llvm@9
+    - ninja
+    - snappy
+    - sqlite3
+    update: true
+
+install:
+# The following Homebrew packages aren't linked by default, and need to be
+# prepended to the path explicitly.
+- if [ "$TRAVIS_OS_NAME" = "osx" ]; then
+    export PATH="$(brew --prefix llvm)/bin:$PATH";
+  fi
+# /usr/bin/gcc points to an older compiler on both Linux and macOS.
+- if [ "$CXX" = "g++" ]; then export CXX="g++-9" CC="gcc-9"; fi
+# /usr/bin/clang points to an older compiler on both Linux and macOS.
+#
+# Homebrew's llvm package doesn't ship a versioned clang++ binary, so the values
+# below don't work on macOS. Fortunately, the path change above makes the
+# default values (clang and clang++) resolve to the correct compiler on macOS.
+- if [ "$TRAVIS_OS_NAME" = "linux" ]; then
+    if [ "$CXX" = "clang++" ]; then export CXX="clang++-9" CC="clang-9"; fi;
+  fi
+- echo ${CC}
+- echo ${CXX}
+- ${CXX} --version
+- cmake --version
+
+before_script:
+- mkdir -p build && cd build
+- cmake .. -G Ninja -DCMAKE_BUILD_TYPE=$BUILD_TYPE
+    -DCMAKE_INSTALL_PREFIX=$HOME/.local
+- cmake --build .
+- cd ..
+
 script:
-- make -j 4 check
+- cd build && ctest --verbose && cd ..
+- "if [ -f build/db_bench ] ; then build/db_bench ; fi"
+- "if [ -f build/db_bench_sqlite3 ] ; then build/db_bench_sqlite3 ; fi"
+- "if [ -f build/db_bench_tree_db ] ; then build/db_bench_tree_db ; fi"
+- cd build && cmake --build . --target install

CMakeLists.txt

@@ -0,0 +1,465 @@
+# Copyright 2017 The LevelDB Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file. See the AUTHORS file for names of contributors.
+
+cmake_minimum_required(VERSION 3.9)
+# Keep the version below in sync with the one in db.h
+project(leveldb VERSION 1.22.0 LANGUAGES C CXX)
+
+# This project can use C11, but will gracefully decay down to C89.
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_C_STANDARD_REQUIRED OFF)
+set(CMAKE_C_EXTENSIONS OFF)
+
+# This project requires C++11.
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+
+if (WIN32)
+  set(LEVELDB_PLATFORM_NAME LEVELDB_PLATFORM_WINDOWS)
+  # TODO(cmumford): Make UNICODE configurable for Windows.
+  add_definitions(-D_UNICODE -DUNICODE)
+else (WIN32)
+  set(LEVELDB_PLATFORM_NAME LEVELDB_PLATFORM_POSIX)
+endif (WIN32)
+
+option(LEVELDB_BUILD_TESTS "Build LevelDB's unit tests" ON)
+option(LEVELDB_BUILD_BENCHMARKS "Build LevelDB's benchmarks" ON)
+option(LEVELDB_INSTALL "Install LevelDB's header and library" ON)
+
+include(TestBigEndian)
+test_big_endian(LEVELDB_IS_BIG_ENDIAN)
+
+include(CheckIncludeFile)
+check_include_file("unistd.h" HAVE_UNISTD_H)
+
+include(CheckLibraryExists)
+check_library_exists(crc32c crc32c_value "" HAVE_CRC32C)
+check_library_exists(snappy snappy_compress "" HAVE_SNAPPY)
+check_library_exists(tcmalloc malloc "" HAVE_TCMALLOC)
+
+include(CheckCXXSymbolExists)
+# Using check_cxx_symbol_exists() instead of check_c_symbol_exists() because
+# we're including the header from C++, and feature detection should use the same
+# compiler language that the project will use later. Principles aside, some
+# versions of do not expose fdatasync() in <unistd.h> in standard C mode
+# (-std=c11), but do expose the function in standard C++ mode (-std=c++11).
+check_cxx_symbol_exists(fdatasync "unistd.h" HAVE_FDATASYNC)
+check_cxx_symbol_exists(F_FULLFSYNC "fcntl.h" HAVE_FULLFSYNC)
+check_cxx_symbol_exists(O_CLOEXEC "fcntl.h" HAVE_O_CLOEXEC)
+
+if(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+  # Disable C++ exceptions.
+  string(REGEX REPLACE "/EH[a-z]+" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /EHs-c-")
+  add_definitions(-D_HAS_EXCEPTIONS=0)
+
+  # Disable RTTI.
+  string(REGEX REPLACE "/GR" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /GR-")
+else(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+  # Enable strict prototype warnings for C code in clang and gcc.
+  if(NOT CMAKE_C_FLAGS MATCHES "-Wstrict-prototypes")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wstrict-prototypes")
+  endif(NOT CMAKE_C_FLAGS MATCHES "-Wstrict-prototypes")
+
+  # Disable C++ exceptions.
+  string(REGEX REPLACE "-fexceptions" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-exceptions")
+
+  # Disable RTTI.
+  string(REGEX REPLACE "-frtti" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti")
+endif(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+
+# Test whether -Wthread-safety is available. See
+# https://clang.llvm.org/docs/ThreadSafetyAnalysis.html
+include(CheckCXXCompilerFlag)
+check_cxx_compiler_flag(-Wthread-safety HAVE_CLANG_THREAD_SAFETY)
+
+include(CheckCXXSourceCompiles)
+
+# Test whether C++17 __has_include is available.
+check_cxx_source_compiles("
+#if defined(__has_include) &&  __has_include(<string>)
+#include <string>
+#endif
+int main() { std::string str; return 0; }
+" HAVE_CXX17_HAS_INCLUDE)
+
+set(LEVELDB_PUBLIC_INCLUDE_DIR "include/leveldb")
+set(LEVELDB_PORT_CONFIG_DIR "include/port")
+
+configure_file(
+  "port/port_config.h.in"
+  "${PROJECT_BINARY_DIR}/${LEVELDB_PORT_CONFIG_DIR}/port_config.h"
+)
+
+include_directories(
+  "${PROJECT_BINARY_DIR}/include"
+  "."
+)
+
+if(BUILD_SHARED_LIBS)
+  # Only export LEVELDB_EXPORT symbols from the shared library.
+  add_compile_options(-fvisibility=hidden)
+endif(BUILD_SHARED_LIBS)
+
+# Must be included before CMAKE_INSTALL_INCLUDEDIR is used.
+include(GNUInstallDirs)
+
+add_library(leveldb "")
+target_sources(leveldb
+  PRIVATE
+    "${PROJECT_BINARY_DIR}/${LEVELDB_PORT_CONFIG_DIR}/port_config.h"
+    "db/builder.cc"
+    "db/builder.h"
+    "db/c.cc"
+    "db/db_impl.cc"
+    "db/db_impl.h"
+    "db/db_iter.cc"
+    "db/db_iter.h"
+    "db/dbformat.cc"
+    "db/dbformat.h"
+    "db/dumpfile.cc"
+    "db/filename.cc"
+    "db/filename.h"
+    "db/log_format.h"
+    "db/log_reader.cc"
+    "db/log_reader.h"
+    "db/log_writer.cc"
+    "db/log_writer.h"
+    "db/memtable.cc"
+    "db/memtable.h"
+    "db/repair.cc"
+    "db/skiplist.h"
+    "db/snapshot.h"
+    "db/table_cache.cc"
+    "db/table_cache.h"
+    "db/version_edit.cc"
+    "db/version_edit.h"
+    "db/version_set.cc"
+    "db/version_set.h"
+    "db/write_batch_internal.h"
+    "db/write_batch.cc"
+    "port/port_stdcxx.h"
+    "port/port.h"
+    "port/thread_annotations.h"
+    "table/block_builder.cc"
+    "table/block_builder.h"
+    "table/block.cc"
+    "table/block.h"
+    "table/filter_block.cc"
+    "table/filter_block.h"
+    "table/format.cc"
+    "table/format.h"
+    "table/iterator_wrapper.h"
+    "table/iterator.cc"
+    "table/merger.cc"
+    "table/merger.h"
+    "table/table_builder.cc"
+    "table/table.cc"
+    "table/two_level_iterator.cc"
+    "table/two_level_iterator.h"
+    "util/arena.cc"
+    "util/arena.h"
+    "util/bloom.cc"
+    "util/cache.cc"
+    "util/coding.cc"
+    "util/coding.h"
+    "util/comparator.cc"
+    "util/crc32c.cc"
+    "util/crc32c.h"
+    "util/env.cc"
+    "util/filter_policy.cc"
+    "util/hash.cc"
+    "util/hash.h"
+    "util/logging.cc"
+    "util/logging.h"
+    "util/mutexlock.h"
+    "util/no_destructor.h"
+    "util/options.cc"
+    "util/random.h"
+    "util/status.cc"
+
+  # Only CMake 3.3+ supports PUBLIC sources in targets exported by "install".
+  $<$<VERSION_GREATER:CMAKE_VERSION,3.2>:PUBLIC>
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/c.h"
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/cache.h"
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/comparator.h"
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/db.h"
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/dumpfile.h"
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/env.h"
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/export.h"
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/filter_policy.h"
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/iterator.h"
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/options.h"
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/slice.h"
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/status.h"
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/table_builder.h"
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/table.h"
+    "${LEVELDB_PUBLIC_INCLUDE_DIR}/write_batch.h"
+)
+
+if (WIN32)
+  target_sources(leveldb
+    PRIVATE
+      "util/env_windows.cc"
+      "util/windows_logger.h"
+  )
+else (WIN32)
+  target_sources(leveldb
+    PRIVATE
+      "util/env_posix.cc"
+      "util/posix_logger.h"
+  )
+endif (WIN32)
+
+# MemEnv is not part of the interface and could be pulled to a separate library.
+target_sources(leveldb
+  PRIVATE
+    "helpers/memenv/memenv.cc"
+    "helpers/memenv/memenv.h"
+)
+
+target_include_directories(leveldb
+  PUBLIC
+    $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>
+    $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+)
+
+set_target_properties(leveldb
+  PROPERTIES VERSION ${PROJECT_VERSION} SOVERSION ${PROJECT_VERSION_MAJOR})
+
+target_compile_definitions(leveldb
+  PRIVATE
+    # Used by include/export.h when building shared libraries.
+    LEVELDB_COMPILE_LIBRARY
+    # Used by port/port.h.
+    ${LEVELDB_PLATFORM_NAME}=1
+)
+if (NOT HAVE_CXX17_HAS_INCLUDE)
+  target_compile_definitions(leveldb
+    PRIVATE
+      LEVELDB_HAS_PORT_CONFIG_H=1
+  )
+endif(NOT HAVE_CXX17_HAS_INCLUDE)
+
+if(BUILD_SHARED_LIBS)
+  target_compile_definitions(leveldb
+    PUBLIC
+      # Used by include/export.h.
+      LEVELDB_SHARED_LIBRARY
+  )
+endif(BUILD_SHARED_LIBS)
+
+if(HAVE_CLANG_THREAD_SAFETY)
+  target_compile_options(leveldb
+    PUBLIC
+      -Werror -Wthread-safety)
+endif(HAVE_CLANG_THREAD_SAFETY)
+
+if(HAVE_CRC32C)
+  target_link_libraries(leveldb crc32c)
+endif(HAVE_CRC32C)
+if(HAVE_SNAPPY)
+  target_link_libraries(leveldb snappy)
+endif(HAVE_SNAPPY)
+if(HAVE_TCMALLOC)
+  target_link_libraries(leveldb tcmalloc)
+endif(HAVE_TCMALLOC)
+
+# Needed by port_stdcxx.h
+find_package(Threads REQUIRED)
+target_link_libraries(leveldb Threads::Threads)
+
+add_executable(leveldbutil
+  "db/leveldbutil.cc"
+)
+target_link_libraries(leveldbutil leveldb)
+
+if(LEVELDB_BUILD_TESTS)
+  enable_testing()
+
+  function(leveldb_test test_file)
+    get_filename_component(test_target_name "${test_file}" NAME_WE)
+
+    add_executable("${test_target_name}" "")
+    target_sources("${test_target_name}"
+      PRIVATE
+        "${PROJECT_BINARY_DIR}/${LEVELDB_PORT_CONFIG_DIR}/port_config.h"
+        "util/testharness.cc"
+        "util/testharness.h"
+        "util/testutil.cc"
+        "util/testutil.h"
+
+        "${test_file}"
+    )
+    target_link_libraries("${test_target_name}" leveldb)
+    target_compile_definitions("${test_target_name}"
+      PRIVATE
+        ${LEVELDB_PLATFORM_NAME}=1
+    )
+    if (NOT HAVE_CXX17_HAS_INCLUDE)
+      target_compile_definitions("${test_target_name}"
+        PRIVATE
+          LEVELDB_HAS_PORT_CONFIG_H=1
+      )
+    endif(NOT HAVE_CXX17_HAS_INCLUDE)
+
+    add_test(NAME "${test_target_name}" COMMAND "${test_target_name}")
+  endfunction(leveldb_test)
+
+  leveldb_test("db/c_test.c")
+  leveldb_test("db/fault_injection_test.cc")
+
+  leveldb_test("issues/issue178_test.cc")
+  leveldb_test("issues/issue200_test.cc")
+  leveldb_test("issues/issue320_test.cc")
+
+  leveldb_test("util/env_test.cc")
+  leveldb_test("util/status_test.cc")
+  leveldb_test("util/no_destructor_test.cc")
+
+  if(NOT BUILD_SHARED_LIBS)
+    leveldb_test("db/autocompact_test.cc")
+    leveldb_test("db/corruption_test.cc")
+    leveldb_test("db/db_test.cc")
+    leveldb_test("db/dbformat_test.cc")
+    leveldb_test("db/filename_test.cc")
+    leveldb_test("db/log_test.cc")
+    leveldb_test("db/recovery_test.cc")
+    leveldb_test("db/skiplist_test.cc")
+    leveldb_test("db/version_edit_test.cc")
+    leveldb_test("db/version_set_test.cc")
+    leveldb_test("db/write_batch_test.cc")
+
+    leveldb_test("helpers/memenv/memenv_test.cc")
+
+    leveldb_test("table/filter_block_test.cc")
+    leveldb_test("table/table_test.cc")
+
+    leveldb_test("util/arena_test.cc")
+    leveldb_test("util/bloom_test.cc")
+    leveldb_test("util/cache_test.cc")
+    leveldb_test("util/coding_test.cc")
+    leveldb_test("util/crc32c_test.cc")
+    leveldb_test("util/hash_test.cc")
+    leveldb_test("util/logging_test.cc")
+
+    # TODO(costan): This test also uses
+    #               "util/env_{posix|windows}_test_helper.h"
+    if (WIN32)
+      leveldb_test("util/env_windows_test.cc")
+    else (WIN32)
+      leveldb_test("util/env_posix_test.cc")
+    endif (WIN32)
+  endif(NOT BUILD_SHARED_LIBS)
+endif(LEVELDB_BUILD_TESTS)
+
+if(LEVELDB_BUILD_BENCHMARKS)
+  function(leveldb_benchmark bench_file)
+    get_filename_component(bench_target_name "${bench_file}" NAME_WE)
+
+    add_executable("${bench_target_name}" "")
+    target_sources("${bench_target_name}"
+      PRIVATE
+        "${PROJECT_BINARY_DIR}/${LEVELDB_PORT_CONFIG_DIR}/port_config.h"
+        "util/histogram.cc"
+        "util/histogram.h"
+        "util/testharness.cc"
+        "util/testharness.h"
+        "util/testutil.cc"
+        "util/testutil.h"
+
+        "${bench_file}"
+    )
+    target_link_libraries("${bench_target_name}" leveldb)
+    target_compile_definitions("${bench_target_name}"
+      PRIVATE
+        ${LEVELDB_PLATFORM_NAME}=1
+    )
+    if (NOT HAVE_CXX17_HAS_INCLUDE)
+      target_compile_definitions("${bench_target_name}"
+        PRIVATE
+          LEVELDB_HAS_PORT_CONFIG_H=1
+      )
+    endif(NOT HAVE_CXX17_HAS_INCLUDE)
+  endfunction(leveldb_benchmark)
+
+  if(NOT BUILD_SHARED_LIBS)
+    leveldb_benchmark("benchmarks/db_bench.cc")
+  endif(NOT BUILD_SHARED_LIBS)
+
+  check_library_exists(sqlite3 sqlite3_open "" HAVE_SQLITE3)
+  if(HAVE_SQLITE3)
+    leveldb_benchmark("benchmarks/db_bench_sqlite3.cc")
+    target_link_libraries(db_bench_sqlite3 sqlite3)
+  endif(HAVE_SQLITE3)
+
+  # check_library_exists is insufficient here because the library names have
+  # different manglings when compiled with clang or gcc, at least when installed
+  # with Homebrew on Mac.
+  set(OLD_CMAKE_REQURED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
+  list(APPEND CMAKE_REQUIRED_LIBRARIES kyotocabinet)
+  check_cxx_source_compiles("
+#include <kcpolydb.h>
+
+int main() {
+  kyotocabinet::TreeDB* db = new kyotocabinet::TreeDB();
+  delete db;
+  return 0;
+}
+  "  HAVE_KYOTOCABINET)
+  set(CMAKE_REQUIRED_LIBRARIES ${OLD_CMAKE_REQURED_LIBRARIES})
+  if(HAVE_KYOTOCABINET)
+    leveldb_benchmark("benchmarks/db_bench_tree_db.cc")
+    target_link_libraries(db_bench_tree_db kyotocabinet)
+  endif(HAVE_KYOTOCABINET)
+endif(LEVELDB_BUILD_BENCHMARKS)
+
+if(LEVELDB_INSTALL)
+  install(TARGETS leveldb
+    EXPORT leveldbTargets
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  )
+  install(
+    FILES
+      "${LEVELDB_PUBLIC_INCLUDE_DIR}/c.h"
+      "${LEVELDB_PUBLIC_INCLUDE_DIR}/cache.h"
+      "${LEVELDB_PUBLIC_INCLUDE_DIR}/comparator.h"
+      "${LEVELDB_PUBLIC_INCLUDE_DIR}/db.h"
+      "${LEVELDB_PUBLIC_INCLUDE_DIR}/dumpfile.h"
+      "${LEVELDB_PUBLIC_INCLUDE_DIR}/env.h"
+      "${LEVELDB_PUBLIC_INCLUDE_DIR}/export.h"
+      "${LEVELDB_PUBLIC_INCLUDE_DIR}/filter_policy.h"
+      "${LEVELDB_PUBLIC_INCLUDE_DIR}/iterator.h"
+      "${LEVELDB_PUBLIC_INCLUDE_DIR}/options.h"
+      "${LEVELDB_PUBLIC_INCLUDE_DIR}/slice.h"
+      "${LEVELDB_PUBLIC_INCLUDE_DIR}/status.h"
+      "${LEVELDB_PUBLIC_INCLUDE_DIR}/table_builder.h"
+      "${LEVELDB_PUBLIC_INCLUDE_DIR}/table.h"
+      "${LEVELDB_PUBLIC_INCLUDE_DIR}/write_batch.h"
+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/leveldb
+  )
+
+  include(CMakePackageConfigHelpers)
+  write_basic_package_version_file(
+      "${PROJECT_BINARY_DIR}/leveldbConfigVersion.cmake"
+      COMPATIBILITY SameMajorVersion
+  )
+  install(
+    EXPORT leveldbTargets
+    NAMESPACE leveldb::
+    DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/leveldb"
+  )
+  install(
+    FILES
+      "cmake/leveldbConfig.cmake"
+      "${PROJECT_BINARY_DIR}/leveldbConfigVersion.cmake"
+    DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/leveldb"
+  )
+endif(LEVELDB_INSTALL)

CONTRIBUTING.md

@@ -32,5 +32,5 @@ the CLA.
 ## Writing Code ##
 
 If your contribution contains code, please make sure that it follows
-[the style guide](http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml).
+[the style guide](http://google.github.io/styleguide/cppguide.html).
 Otherwise we will have to ask you to make changes, and that's no fun for anyone.

Makefile

@@ -1,424 +0,0 @@
-# Copyright (c) 2011 The LevelDB Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file. See the AUTHORS file for names of contributors.
-
-#-----------------------------------------------
-# Uncomment exactly one of the lines labelled (A), (B), and (C) below
-# to switch between compilation modes.
-
-# (A) Production use (optimized mode)
-OPT ?= -O2 -DNDEBUG
-# (B) Debug mode, w/ full line-level debugging symbols
-# OPT ?= -g2
-# (C) Profiling mode: opt, but w/debugging symbols
-# OPT ?= -O2 -g2 -DNDEBUG
-#-----------------------------------------------
-
-# detect what platform we're building on
-$(shell CC="$(CC)" CXX="$(CXX)" TARGET_OS="$(TARGET_OS)" \
-    ./build_detect_platform build_config.mk ./)
-# this file is generated by the previous line to set build flags and sources
-include build_config.mk
-
-TESTS = \
-	db/autocompact_test \
-	db/c_test \
-	db/corruption_test \
-	db/db_test \
-	db/dbformat_test \
-	db/fault_injection_test \
-	db/filename_test \
-	db/log_test \
-	db/recovery_test \
-	db/skiplist_test \
-	db/version_edit_test \
-	db/version_set_test \
-	db/write_batch_test \
-	helpers/memenv/memenv_test \
-	issues/issue178_test \
-	issues/issue200_test \
-	table/filter_block_test \
-	table/table_test \
-	util/arena_test \
-	util/bloom_test \
-	util/cache_test \
-	util/coding_test \
-	util/crc32c_test \
-	util/env_posix_test \
-	util/env_test \
-	util/hash_test
-
-UTILS = \
-	db/db_bench \
-	db/leveldbutil
-
-# Put the object files in a subdirectory, but the application at the top of the object dir.
-PROGNAMES := $(notdir $(TESTS) $(UTILS))
-
-# On Linux may need libkyotocabinet-dev for dependency.
-BENCHMARKS = \
-	doc/bench/db_bench_sqlite3 \
-	doc/bench/db_bench_tree_db
-
-CFLAGS += -I. -I./include $(PLATFORM_CCFLAGS) $(OPT)
-CXXFLAGS += -I. -I./include $(PLATFORM_CXXFLAGS) $(OPT)
-
-LDFLAGS += $(PLATFORM_LDFLAGS)
-LIBS += $(PLATFORM_LIBS)
-
-SIMULATOR_OUTDIR=out-ios-x86
-DEVICE_OUTDIR=out-ios-arm
-
-ifeq ($(PLATFORM), IOS)
-# Note: iOS should probably be using libtool, not ar.
-AR=xcrun ar
-SIMULATORSDK=$(shell xcrun -sdk iphonesimulator --show-sdk-path)
-DEVICESDK=$(shell xcrun -sdk iphoneos --show-sdk-path)
-DEVICE_CFLAGS = -isysroot "$(DEVICESDK)" -arch armv6 -arch armv7 -arch armv7s -arch arm64
-SIMULATOR_CFLAGS = -isysroot "$(SIMULATORSDK)" -arch i686 -arch x86_64
-STATIC_OUTDIR=out-ios-universal
-else
-STATIC_OUTDIR=out-static
-SHARED_OUTDIR=out-shared
-STATIC_PROGRAMS := $(addprefix $(STATIC_OUTDIR)/, $(PROGNAMES))
-SHARED_PROGRAMS := $(addprefix $(SHARED_OUTDIR)/, db_bench)
-endif
-
-STATIC_LIBOBJECTS := $(addprefix $(STATIC_OUTDIR)/, $(SOURCES:.cc=.o))
-STATIC_MEMENVOBJECTS := $(addprefix $(STATIC_OUTDIR)/, $(MEMENV_SOURCES:.cc=.o))
-
-DEVICE_LIBOBJECTS := $(addprefix $(DEVICE_OUTDIR)/, $(SOURCES:.cc=.o))
-DEVICE_MEMENVOBJECTS := $(addprefix $(DEVICE_OUTDIR)/, $(MEMENV_SOURCES:.cc=.o))
-
-SIMULATOR_LIBOBJECTS := $(addprefix $(SIMULATOR_OUTDIR)/, $(SOURCES:.cc=.o))
-SIMULATOR_MEMENVOBJECTS := $(addprefix $(SIMULATOR_OUTDIR)/, $(MEMENV_SOURCES:.cc=.o))
-
-SHARED_LIBOBJECTS := $(addprefix $(SHARED_OUTDIR)/, $(SOURCES:.cc=.o))
-SHARED_MEMENVOBJECTS := $(addprefix $(SHARED_OUTDIR)/, $(MEMENV_SOURCES:.cc=.o))
-
-TESTUTIL := $(STATIC_OUTDIR)/util/testutil.o
-TESTHARNESS := $(STATIC_OUTDIR)/util/testharness.o $(TESTUTIL)
-
-STATIC_TESTOBJS := $(addprefix $(STATIC_OUTDIR)/, $(addsuffix .o, $(TESTS)))
-STATIC_UTILOBJS := $(addprefix $(STATIC_OUTDIR)/, $(addsuffix .o, $(UTILS)))
-STATIC_ALLOBJS := $(STATIC_LIBOBJECTS) $(STATIC_MEMENVOBJECTS) $(STATIC_TESTOBJS) $(STATIC_UTILOBJS) $(TESTHARNESS)
-DEVICE_ALLOBJS := $(DEVICE_LIBOBJECTS) $(DEVICE_MEMENVOBJECTS)
-SIMULATOR_ALLOBJS := $(SIMULATOR_LIBOBJECTS) $(SIMULATOR_MEMENVOBJECTS)
-
-default: all
-
-# Should we build shared libraries?
-ifneq ($(PLATFORM_SHARED_EXT),)
-
-# Many leveldb test apps use non-exported API's. Only build a subset for testing.
-SHARED_ALLOBJS := $(SHARED_LIBOBJECTS) $(SHARED_MEMENVOBJECTS) $(TESTHARNESS)
-
-ifneq ($(PLATFORM_SHARED_VERSIONED),true)
-SHARED_LIB1 = libleveldb.$(PLATFORM_SHARED_EXT)
-SHARED_LIB2 = $(SHARED_LIB1)
-SHARED_LIB3 = $(SHARED_LIB1)
-SHARED_LIBS = $(SHARED_LIB1)
-SHARED_MEMENVLIB = $(SHARED_OUTDIR)/libmemenv.a
-else
-# Update db.h if you change these.
-SHARED_VERSION_MAJOR = 1
-SHARED_VERSION_MINOR = 20
-SHARED_LIB1 = libleveldb.$(PLATFORM_SHARED_EXT)
-SHARED_LIB2 = $(SHARED_LIB1).$(SHARED_VERSION_MAJOR)
-SHARED_LIB3 = $(SHARED_LIB1).$(SHARED_VERSION_MAJOR).$(SHARED_VERSION_MINOR)
-SHARED_LIBS = $(SHARED_OUTDIR)/$(SHARED_LIB1) $(SHARED_OUTDIR)/$(SHARED_LIB2) $(SHARED_OUTDIR)/$(SHARED_LIB3)
-$(SHARED_OUTDIR)/$(SHARED_LIB1): $(SHARED_OUTDIR)/$(SHARED_LIB3)
-	ln -fs $(SHARED_LIB3) $(SHARED_OUTDIR)/$(SHARED_LIB1)
-$(SHARED_OUTDIR)/$(SHARED_LIB2): $(SHARED_OUTDIR)/$(SHARED_LIB3)
-	ln -fs $(SHARED_LIB3) $(SHARED_OUTDIR)/$(SHARED_LIB2)
-SHARED_MEMENVLIB = $(SHARED_OUTDIR)/libmemenv.a
-endif
-
-$(SHARED_OUTDIR)/$(SHARED_LIB3): $(SHARED_LIBOBJECTS)
-	$(CXX) $(LDFLAGS) $(PLATFORM_SHARED_LDFLAGS)$(SHARED_LIB2) $(SHARED_LIBOBJECTS) -o $(SHARED_OUTDIR)/$(SHARED_LIB3) $(LIBS)
-
-endif  # PLATFORM_SHARED_EXT
-
-all: $(SHARED_LIBS) $(SHARED_PROGRAMS) $(STATIC_OUTDIR)/libleveldb.a $(STATIC_OUTDIR)/libmemenv.a $(STATIC_PROGRAMS)
-
-check: $(STATIC_PROGRAMS)
-	for t in $(notdir $(TESTS)); do echo "***** Running $$t"; $(STATIC_OUTDIR)/$$t || exit 1; done
-
-clean:
-	-rm -rf out-static out-shared out-ios-x86 out-ios-arm out-ios-universal
-	-rm -f build_config.mk
-	-rm -rf ios-x86 ios-arm
-
-$(STATIC_OUTDIR):
-	mkdir $@
-
-$(STATIC_OUTDIR)/db: | $(STATIC_OUTDIR)
-	mkdir $@
-
-$(STATIC_OUTDIR)/helpers/memenv: | $(STATIC_OUTDIR)
-	mkdir -p $@
-
-$(STATIC_OUTDIR)/port: | $(STATIC_OUTDIR)
-	mkdir $@
-
-$(STATIC_OUTDIR)/table: | $(STATIC_OUTDIR)
-	mkdir $@
-
-$(STATIC_OUTDIR)/util: | $(STATIC_OUTDIR)
-	mkdir $@
-
-.PHONY: STATIC_OBJDIRS
-STATIC_OBJDIRS: \
-	$(STATIC_OUTDIR)/db \
-	$(STATIC_OUTDIR)/port \
-	$(STATIC_OUTDIR)/table \
-	$(STATIC_OUTDIR)/util \
-	$(STATIC_OUTDIR)/helpers/memenv
-
-$(SHARED_OUTDIR):
-	mkdir $@
-
-$(SHARED_OUTDIR)/db: | $(SHARED_OUTDIR)
-	mkdir $@
-
-$(SHARED_OUTDIR)/helpers/memenv: | $(SHARED_OUTDIR)
-	mkdir -p $@
-
-$(SHARED_OUTDIR)/port: | $(SHARED_OUTDIR)
-	mkdir $@
-
-$(SHARED_OUTDIR)/table: | $(SHARED_OUTDIR)
-	mkdir $@
-
-$(SHARED_OUTDIR)/util: | $(SHARED_OUTDIR)
-	mkdir $@
-
-.PHONY: SHARED_OBJDIRS
-SHARED_OBJDIRS: \
-	$(SHARED_OUTDIR)/db \
-	$(SHARED_OUTDIR)/port \
-	$(SHARED_OUTDIR)/table \
-	$(SHARED_OUTDIR)/util \
-	$(SHARED_OUTDIR)/helpers/memenv
-
-$(DEVICE_OUTDIR):
-	mkdir $@
-
-$(DEVICE_OUTDIR)/db: | $(DEVICE_OUTDIR)
-	mkdir $@
-
-$(DEVICE_OUTDIR)/helpers/memenv: | $(DEVICE_OUTDIR)
-	mkdir -p $@
-
-$(DEVICE_OUTDIR)/port: | $(DEVICE_OUTDIR)
-	mkdir $@
-
-$(DEVICE_OUTDIR)/table: | $(DEVICE_OUTDIR)
-	mkdir $@
-
-$(DEVICE_OUTDIR)/util: | $(DEVICE_OUTDIR)
-	mkdir $@
-
-.PHONY: DEVICE_OBJDIRS
-DEVICE_OBJDIRS: \
-	$(DEVICE_OUTDIR)/db \
-	$(DEVICE_OUTDIR)/port \
-	$(DEVICE_OUTDIR)/table \
-	$(DEVICE_OUTDIR)/util \
-	$(DEVICE_OUTDIR)/helpers/memenv
-
-$(SIMULATOR_OUTDIR):
-	mkdir $@
-
-$(SIMULATOR_OUTDIR)/db: | $(SIMULATOR_OUTDIR)
-	mkdir $@
-
-$(SIMULATOR_OUTDIR)/helpers/memenv: | $(SIMULATOR_OUTDIR)
-	mkdir -p $@
-
-$(SIMULATOR_OUTDIR)/port: | $(SIMULATOR_OUTDIR)
-	mkdir $@
-
-$(SIMULATOR_OUTDIR)/table: | $(SIMULATOR_OUTDIR)
-	mkdir $@
-
-$(SIMULATOR_OUTDIR)/util: | $(SIMULATOR_OUTDIR)
-	mkdir $@
-
-.PHONY: SIMULATOR_OBJDIRS
-SIMULATOR_OBJDIRS: \
-	$(SIMULATOR_OUTDIR)/db \
-	$(SIMULATOR_OUTDIR)/port \
-	$(SIMULATOR_OUTDIR)/table \
-	$(SIMULATOR_OUTDIR)/util \
-	$(SIMULATOR_OUTDIR)/helpers/memenv
-
-$(STATIC_ALLOBJS): | STATIC_OBJDIRS
-$(DEVICE_ALLOBJS): | DEVICE_OBJDIRS
-$(SIMULATOR_ALLOBJS): | SIMULATOR_OBJDIRS
-$(SHARED_ALLOBJS): | SHARED_OBJDIRS
-
-ifeq ($(PLATFORM), IOS)
-$(DEVICE_OUTDIR)/libleveldb.a: $(DEVICE_LIBOBJECTS)
-	rm -f $@
-	$(AR) -rs $@ $(DEVICE_LIBOBJECTS)
-
-$(SIMULATOR_OUTDIR)/libleveldb.a: $(SIMULATOR_LIBOBJECTS)
-	rm -f $@
-	$(AR) -rs $@ $(SIMULATOR_LIBOBJECTS)
-
-$(DEVICE_OUTDIR)/libmemenv.a: $(DEVICE_MEMENVOBJECTS)
-	rm -f $@
-	$(AR) -rs $@ $(DEVICE_MEMENVOBJECTS)
-
-$(SIMULATOR_OUTDIR)/libmemenv.a: $(SIMULATOR_MEMENVOBJECTS)
-	rm -f $@
-	$(AR) -rs $@ $(SIMULATOR_MEMENVOBJECTS)
-
-# For iOS, create universal object libraries to be used on both the simulator and
-# a device.
-$(STATIC_OUTDIR)/libleveldb.a: $(STATIC_OUTDIR) $(DEVICE_OUTDIR)/libleveldb.a $(SIMULATOR_OUTDIR)/libleveldb.a
-	lipo -create $(DEVICE_OUTDIR)/libleveldb.a $(SIMULATOR_OUTDIR)/libleveldb.a -output $@
-
-$(STATIC_OUTDIR)/libmemenv.a: $(STATIC_OUTDIR) $(DEVICE_OUTDIR)/libmemenv.a $(SIMULATOR_OUTDIR)/libmemenv.a
-	lipo -create $(DEVICE_OUTDIR)/libmemenv.a $(SIMULATOR_OUTDIR)/libmemenv.a -output $@
-else
-$(STATIC_OUTDIR)/libleveldb.a:$(STATIC_LIBOBJECTS)
-	rm -f $@
-	$(AR) -rs $@ $(STATIC_LIBOBJECTS)
-
-$(STATIC_OUTDIR)/libmemenv.a:$(STATIC_MEMENVOBJECTS)
-	rm -f $@
-	$(AR) -rs $@ $(STATIC_MEMENVOBJECTS)
-endif
-
-$(SHARED_MEMENVLIB):$(SHARED_MEMENVOBJECTS)
-	rm -f $@
-	$(AR) -rs $@ $(SHARED_MEMENVOBJECTS)
-
-$(STATIC_OUTDIR)/db_bench:db/db_bench.cc $(STATIC_LIBOBJECTS) $(TESTUTIL)
-	$(CXX) $(LDFLAGS) $(CXXFLAGS) db/db_bench.cc $(STATIC_LIBOBJECTS) $(TESTUTIL) -o $@ $(LIBS)
-
-$(STATIC_OUTDIR)/db_bench_sqlite3:doc/bench/db_bench_sqlite3.cc $(STATIC_LIBOBJECTS) $(TESTUTIL)
-	$(CXX) $(LDFLAGS) $(CXXFLAGS) doc/bench/db_bench_sqlite3.cc $(STATIC_LIBOBJECTS) $(TESTUTIL) -o $@ -lsqlite3 $(LIBS)
-
-$(STATIC_OUTDIR)/db_bench_tree_db:doc/bench/db_bench_tree_db.cc $(STATIC_LIBOBJECTS) $(TESTUTIL)
-	$(CXX) $(LDFLAGS) $(CXXFLAGS) doc/bench/db_bench_tree_db.cc $(STATIC_LIBOBJECTS) $(TESTUTIL) -o $@ -lkyotocabinet $(LIBS)
-
-$(STATIC_OUTDIR)/leveldbutil:db/leveldbutil.cc $(STATIC_LIBOBJECTS)
-	$(CXX) $(LDFLAGS) $(CXXFLAGS) db/leveldbutil.cc $(STATIC_LIBOBJECTS) -o $@ $(LIBS)
-
-$(STATIC_OUTDIR)/arena_test:util/arena_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) $(LDFLAGS) $(CXXFLAGS) util/arena_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS) -o $@ $(LIBS)
-
-$(STATIC_OUTDIR)/autocompact_test:db/autocompact_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) $(LDFLAGS) $(CXXFLAGS) db/autocompact_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS) -o $@ $(LIBS)
-
-$(STATIC_OUTDIR)/bloom_test:util/bloom_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) $(LDFLAGS) $(CXXFLAGS) util/bloom_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS) -o $@ $(LIBS)
-
-$(STATIC_OUTDIR)/c_test:$(STATIC_OUTDIR)/db/c_test.o $(STATIC_LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) $(LDFLAGS) $(STATIC_OUTDIR)/db/c_test.o $(STATIC_LIBOBJECTS) $(TESTHARNESS) -o $@ $(LIBS)
-
-$(STATIC_OUTDIR)/cache_test:util/cache_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) $(LDFLAGS) $(CXXFLAGS) util/cache_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS) -o $@ $(LIBS)
-
-$(STATIC_OUTDIR)/coding_test:util/coding_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) $(LDFLAGS) $(CXXFLAGS) util/coding_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS) -o $@ $(LIBS)
-
-$(STATIC_OUTDIR)/corruption_test:db/corruption_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) $(LDFLAGS) $(CXXFLAGS) db/corruption_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS) -o $@ $(LIBS)
-
-$(STATIC_OUTDIR)/crc32c_test:util/crc32c_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) $(LDFLAGS) $(CXXFLAGS) util/crc32c_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS) -o $@ $(LIBS)
-
-$(STATIC_OUTDIR)/db_test:db/db_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) $(LDFLAGS) $(CXXFLAGS) db/db_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS) -o $@ $(LIBS)
-
-$(STATIC_OUTDIR)/dbformat_test:db/dbformat_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) $(LDFLAGS) $(CXXFLAGS) db/dbformat_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS) -o $@ $(LIBS)
-
-$(STATIC_OUTDIR)/env_posix_test:util/env_posix_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) $(LDFLAGS) $(CXXFLAGS) util/env_posix_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS) -o $@ $(LIBS)
-
-$(STATIC_OUTDIR)/env_test:util/env_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) $(LDFLAGS) $(CXXFLAGS) util/env_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS) -o $@ $(LIBS)
-
-$(STATIC_OUTDIR)/fault_injection_test:db/fault_injection_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) $(LDFLAGS) $(CXXFLAGS) db/fault_injection_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS) -o $@ $(LIBS)
-
-$(STATIC_OUTDIR)/filename_test:db/filename_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) $(LDFLAGS) $(CXXFLAGS) db/filename_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS) -o $@ $(LIBS)
-
-$(STATIC_OUTDIR)/filter_block_test:table/filter_block_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) $(LDFLAGS) $(CXXFLAGS) table/filter_block_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS) -o $@ $(LIBS)
-
-$(STATIC_OUTDIR)/hash_test:util/hash_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) $(LDFLAGS) $(CXXFLAGS) util/hash_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS) -o $@ $(LIBS)
-
-$(STATIC_OUTDIR)/issue178_test:issues/issue178_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) $(LDFLAGS) $(CXXFLAGS) issues/issue178_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS) -o $@ $(LIBS)
-
-$(STATIC_OUTDIR)/issue200_test:issues/issue200_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) $(LDFLAGS) $(CXXFLAGS) issues/issue200_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS) -o $@ $(LIBS)
-
-$(STATIC_OUTDIR)/log_test:db/log_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) $(LDFLAGS) $(CXXFLAGS) db/log_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS) -o $@ $(LIBS)
-
-$(STATIC_OUTDIR)/recovery_test:db/recovery_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) $(LDFLAGS) $(CXXFLAGS) db/recovery_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS) -o $@ $(LIBS)
-
-$(STATIC_OUTDIR)/table_test:table/table_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) $(LDFLAGS) $(CXXFLAGS) table/table_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS) -o $@ $(LIBS)
-
-$(STATIC_OUTDIR)/skiplist_test:db/skiplist_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) $(LDFLAGS) $(CXXFLAGS) db/skiplist_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS) -o $@ $(LIBS)
-
-$(STATIC_OUTDIR)/version_edit_test:db/version_edit_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) $(LDFLAGS) $(CXXFLAGS) db/version_edit_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS) -o $@ $(LIBS)
-
-$(STATIC_OUTDIR)/version_set_test:db/version_set_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) $(LDFLAGS) $(CXXFLAGS) db/version_set_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS) -o $@ $(LIBS)
-
-$(STATIC_OUTDIR)/write_batch_test:db/write_batch_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS)
-	$(CXX) $(LDFLAGS) $(CXXFLAGS) db/write_batch_test.cc $(STATIC_LIBOBJECTS) $(TESTHARNESS) -o $@ $(LIBS)
-
-$(STATIC_OUTDIR)/memenv_test:$(STATIC_OUTDIR)/helpers/memenv/memenv_test.o $(STATIC_OUTDIR)/libmemenv.a $(STATIC_OUTDIR)/libleveldb.a $(TESTHARNESS)
-	$(XCRUN) $(CXX) $(LDFLAGS) $(STATIC_OUTDIR)/helpers/memenv/memenv_test.o $(STATIC_OUTDIR)/libmemenv.a $(STATIC_OUTDIR)/libleveldb.a $(TESTHARNESS) -o $@ $(LIBS)
-
-$(SHARED_OUTDIR)/db_bench:$(SHARED_OUTDIR)/db/db_bench.o $(SHARED_LIBS) $(TESTUTIL)
-	$(XCRUN) $(CXX) $(LDFLAGS) $(CXXFLAGS) $(PLATFORM_SHARED_CFLAGS) $(SHARED_OUTDIR)/db/db_bench.o $(TESTUTIL) $(SHARED_OUTDIR)/$(SHARED_LIB3) -o $@ $(LIBS)
-
-.PHONY: run-shared
-run-shared: $(SHARED_OUTDIR)/db_bench
-	LD_LIBRARY_PATH=$(SHARED_OUTDIR) $(SHARED_OUTDIR)/db_bench
-
-$(SIMULATOR_OUTDIR)/%.o: %.cc
-	xcrun -sdk iphonesimulator $(CXX) $(CXXFLAGS) $(SIMULATOR_CFLAGS) -c $< -o $@
-
-$(DEVICE_OUTDIR)/%.o: %.cc
-	xcrun -sdk iphoneos $(CXX) $(CXXFLAGS) $(DEVICE_CFLAGS) -c $< -o $@
-
-$(SIMULATOR_OUTDIR)/%.o: %.c
-	xcrun -sdk iphonesimulator $(CC) $(CFLAGS) $(SIMULATOR_CFLAGS) -c $< -o $@
-
-$(DEVICE_OUTDIR)/%.o: %.c
-	xcrun -sdk iphoneos $(CC) $(CFLAGS) $(DEVICE_CFLAGS) -c $< -o $@
-
-$(STATIC_OUTDIR)/%.o: %.cc
-	$(CXX) $(CXXFLAGS) -c $< -o $@
-
-$(STATIC_OUTDIR)/%.o: %.c
-	$(CC) $(CFLAGS) -c $< -o $@
-
-$(SHARED_OUTDIR)/%.o: %.cc
-	$(CXX) $(CXXFLAGS) $(PLATFORM_SHARED_CFLAGS) -c $< -o $@
-
-$(SHARED_OUTDIR)/%.o: %.c
-	$(CC) $(CFLAGS) $(PLATFORM_SHARED_CFLAGS) -c $< -o $@
-
-$(STATIC_OUTDIR)/port/port_posix_sse.o: port/port_posix_sse.cc
-	$(CXX) $(CXXFLAGS) $(PLATFORM_SSEFLAGS) -c $< -o $@
-
-$(SHARED_OUTDIR)/port/port_posix_sse.o: port/port_posix_sse.cc
-	$(CXX) $(CXXFLAGS) $(PLATFORM_SHARED_CFLAGS) $(PLATFORM_SSEFLAGS) -c $< -o $@

README.md

@@ -1,10 +1,12 @@
 **LevelDB is a fast key-value storage library written at Google that provides an ordered mapping from string keys to string values.**
 
 [![Build Status](https://travis-ci.org/google/leveldb.svg?branch=master)](https://travis-ci.org/google/leveldb)
+[![Build status](https://ci.appveyor.com/api/projects/status/g2j5j4rfkda6eyw5/branch/master?svg=true)](https://ci.appveyor.com/project/pwnall/leveldb)
 
 Authors: Sanjay Ghemawat (sanjay@google.com) and Jeff Dean (jeff@google.com)
 
 # Features
+
   * Keys and values are arbitrary byte arrays.
   * Data is stored sorted by key.
   * Callers can provide a custom comparison function to override the sort order.
@@ -16,15 +18,55 @@ Authors: Sanjay Ghemawat (sanjay@google.com) and Jeff Dean (jeff@google.com)
   * External activity (file system operations etc.) is relayed through a virtual interface so users can customize the operating system interactions.
 
 # Documentation
+
   [LevelDB library documentation](https://github.com/google/leveldb/blob/master/doc/index.md) is online and bundled with the source code.
 
-
 # Limitations
+
   * This is not a SQL database.  It does not have a relational data model, it does not support SQL queries, and it has no support for indexes.
   * Only a single process (possibly multi-threaded) can access a particular database at a time.
   * There is no client-server support builtin to the library.  An application that needs such support will have to wrap their own server around the library.
 
+# Building
+
+This project supports [CMake](https://cmake.org/) out of the box.
+
+### Build for POSIX
+
+Quick start:
+
+```bash
+mkdir -p build && cd build
+cmake -DCMAKE_BUILD_TYPE=Release .. && cmake --build .
+```
+
+### Building for Windows
+
+First generate the Visual Studio 2017 project/solution files:
+
+```cmd
+mkdir build
+cd build
+cmake -G "Visual Studio 15" ..
+```
+The default default will build for x86. For 64-bit run:
+
+```cmd
+cmake -G "Visual Studio 15 Win64" ..
+```
+
+To compile the Windows solution from the command-line:
+
+```cmd
+devenv /build Debug leveldb.sln
+```
+
+or open leveldb.sln in Visual Studio and build from within.
+
+Please see the CMake documentation and `CMakeLists.txt` for more advanced usage.
+
 # Contributing to the leveldb Project
+
 The leveldb project welcomes contributions. leveldb's primary goal is to be
 a reliable and fast key/value store. Changes that are in line with the
 features/limitations outlined above, and meet the requirements below,
@@ -32,10 +74,10 @@ will be considered.
 
 Contribution requirements:
 
-1. **POSIX only**. We _generally_ will only accept changes that are both
+1. **Tested platforms only**. We _generally_ will only accept changes for
-   compiled, and tested on a POSIX platform - usually Linux. Very small
+   platforms that are compiled and tested. This means POSIX (for Linux and
-   changes will sometimes be accepted, but consider that more of an
+   macOS) or Windows. Very small changes will sometimes be accepted, but
-   exception than the rule.
+   consider that more of an exception than the rule.
 
 2. **Stable API**. We strive very hard to maintain a stable API. Changes that
    require changes for projects using leveldb _might_ be rejected without
@@ -44,7 +86,16 @@ Contribution requirements:
 3. **Tests**: All changes must be accompanied by a new (or changed) test, or
    a sufficient explanation as to why a new (or changed) test is not required.
 
+4. **Consistent Style**: This project conforms to the
+   [Google C++ Style Guide](https://google.github.io/styleguide/cppguide.html).
+   To ensure your changes are properly formatted please run:
+
+   ```
+   clang-format -i --style=file <file>
+   ```
+
 ## Submitting a Pull Request
+
 Before any pull request will be accepted the author must first sign a
 Contributor License Agreement (CLA) at https://cla.developers.google.com/.
 
@@ -138,37 +189,37 @@ uncompressed blocks in memory, the read performance improves again:
 See [doc/index.md](doc/index.md) for more explanation. See
 [doc/impl.md](doc/impl.md) for a brief overview of the implementation.
 
-The public interface is in include/*.h.  Callers should not include or
+The public interface is in include/leveldb/*.h.  Callers should not include or
 rely on the details of any other header files in this package.  Those
 internal APIs may be changed without warning.
 
 Guide to header files:
 
-* **include/db.h**: Main interface to the DB: Start here
+* **include/leveldb/db.h**: Main interface to the DB: Start here.
 
-* **include/options.h**: Control over the behavior of an entire database,
+* **include/leveldb/options.h**: Control over the behavior of an entire database,
 and also control over the behavior of individual reads and writes.
 
-* **include/comparator.h**: Abstraction for user-specified comparison function.
+* **include/leveldb/comparator.h**: Abstraction for user-specified comparison function.
 If you want just bytewise comparison of keys, you can use the default
 comparator, but clients can write their own comparator implementations if they
-want custom ordering (e.g. to handle different character encodings, etc.)
+want custom ordering (e.g. to handle different character encodings, etc.).
 
-* **include/iterator.h**: Interface for iterating over data. You can get
+* **include/leveldb/iterator.h**: Interface for iterating over data. You can get
 an iterator from a DB object.
 
-* **include/write_batch.h**: Interface for atomically applying multiple
+* **include/leveldb/write_batch.h**: Interface for atomically applying multiple
 updates to a database.
 
-* **include/slice.h**: A simple module for maintaining a pointer and a
+* **include/leveldb/slice.h**: A simple module for maintaining a pointer and a
 length into some other byte array.
 
-* **include/status.h**: Status is returned from many of the public interfaces
+* **include/leveldb/status.h**: Status is returned from many of the public interfaces
 and is used to report success and various kinds of errors.
 
-* **include/env.h**:
+* **include/leveldb/env.h**:
 Abstraction of the OS environment.  A posix implementation of this interface is
-in util/env_posix.cc
+in util/env_posix.cc.
 
-* **include/table.h, include/table_builder.h**: Lower-level modules that most
+* **include/leveldb/table.h, include/leveldb/table_builder.h**: Lower-level modules that most
-clients probably won't use directly
+clients probably won't use directly.

WINDOWS.md

@@ -1,39 +0,0 @@
-# Building LevelDB On Windows
-
-## Prereqs 
-
-Install the [Windows Software Development Kit version 7.1](http://www.microsoft.com/downloads/dlx/en-us/listdetailsview.aspx?FamilyID=6b6c21d2-2006-4afa-9702-529fa782d63b).
-
-Download and extract the [Snappy source distribution](http://snappy.googlecode.com/files/snappy-1.0.5.tar.gz)
-
-1. Open the "Windows SDK 7.1 Command Prompt" :
-   Start Menu -> "Microsoft Windows SDK v7.1" > "Windows SDK 7.1 Command Prompt"
-2. Change the directory to the leveldb project
-
-## Building the Static lib 
-
-* 32 bit Version 
-
-        setenv /x86
-        msbuild.exe /p:Configuration=Release /p:Platform=Win32 /p:Snappy=..\snappy-1.0.5
-
-* 64 bit Version 
-
-        setenv /x64
-        msbuild.exe /p:Configuration=Release /p:Platform=x64 /p:Snappy=..\snappy-1.0.5
-
-
-## Building and Running the Benchmark app
-
-* 32 bit Version 
-
-	    setenv /x86
-	    msbuild.exe /p:Configuration=Benchmark /p:Platform=Win32 /p:Snappy=..\snappy-1.0.5
-		Benchmark\leveldb.exe
-
-* 64 bit Version 
-
-	    setenv /x64
-	    msbuild.exe /p:Configuration=Benchmark /p:Platform=x64 /p:Snappy=..\snappy-1.0.5
-	    x64\Benchmark\leveldb.exe
-

benchmarks/db_bench.cc

@@ -2,14 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 
-#include <sys/types.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include "db/db_impl.h"
+#include <sys/types.h>
-#include "db/version_set.h"
+
 #include "leveldb/cache.h"
 #include "leveldb/db.h"
 #include "leveldb/env.h"
+#include "leveldb/filter_policy.h"
 #include "leveldb/write_batch.h"
 #include "port/port.h"
 #include "util/crc32c.h"
@@ -35,7 +35,6 @@
 //      seekrandom    -- N random seeks
 //      open          -- cost of opening a DB
 //      crc32c        -- repeated crc32c of 4K of data
-//      acquireload   -- load N*1000 times
 //   Meta operations:
 //      compact     -- Compact the entire DB
 //      stats       -- Print DB stats
@@ -57,9 +56,7 @@ static const char* FLAGS_benchmarks =
     "fill100K,"
     "crc32c,"
     "snappycomp,"
-    "snappyuncomp,"
+    "snappyuncomp,";
-    "acquireload,"
-    ;
 
 // Number of key/values to place in database
 static int FLAGS_num = 1000000;
@@ -112,12 +109,12 @@ static bool FLAGS_use_existing_db = false;
 static bool FLAGS_reuse_logs = false;
 
 // Use the db with the following name.
-static const char* FLAGS_db = NULL;
+static const char* FLAGS_db = nullptr;
 
 namespace leveldb {
 
 namespace {
-leveldb::Env* g_env = NULL;
+leveldb::Env* g_env = nullptr;
 
 // Helper for quickly generating random data.
 class RandomGenerator {
@@ -158,7 +155,7 @@ static Slice TrimSpace(Slice s) {
     start++;
   }
   size_t limit = s.size();
-  while (limit > start && isspace(s[limit-1])) {
+  while (limit > start && isspace(s[limit - 1])) {
     limit--;
   }
   return Slice(s.data() + start, limit - start);
@@ -190,14 +187,12 @@ class Stats {
 
   void Start() {
     next_report_ = 100;
-    last_op_finish_ = start_;
     hist_.Clear();
     done_ = 0;
     bytes_ = 0;
     seconds_ = 0;
-    start_ = g_env->NowMicros();
-    finish_ = start_;
     message_.clear();
+    start_ = finish_ = last_op_finish_ = g_env->NowMicros();
   }
 
   void Merge(const Stats& other) {
@@ -217,9 +212,7 @@ class Stats {
     seconds_ = (finish_ - start_) * 1e-6;
   }
 
-  void AddMessage(Slice msg) {
+  void AddMessage(Slice msg) { AppendWithSpace(&message_, msg); }
-    AppendWithSpace(&message_, msg);
-  }
 
   void FinishedSingleOp() {
     if (FLAGS_histogram) {
@@ -235,21 +228,26 @@ class Stats {
 
     done_++;
     if (done_ >= next_report_) {
-      if      (next_report_ < 1000)   next_report_ += 100;
+      if (next_report_ < 1000)
-      else if (next_report_ < 5000)   next_report_ += 500;
+        next_report_ += 100;
-      else if (next_report_ < 10000)  next_report_ += 1000;
+      else if (next_report_ < 5000)
-      else if (next_report_ < 50000)  next_report_ += 5000;
+        next_report_ += 500;
-      else if (next_report_ < 100000) next_report_ += 10000;
+      else if (next_report_ < 10000)
-      else if (next_report_ < 500000) next_report_ += 50000;
+        next_report_ += 1000;
-      else                            next_report_ += 100000;
+      else if (next_report_ < 50000)
+        next_report_ += 5000;
+      else if (next_report_ < 100000)
+        next_report_ += 10000;
+      else if (next_report_ < 500000)
+        next_report_ += 50000;
+      else
+        next_report_ += 100000;
       fprintf(stderr, "... finished %d ops%30s\r", done_, "");
       fflush(stderr);
     }
   }
 
-  void AddBytes(int64_t n) {
+  void AddBytes(int64_t n) { bytes_ += n; }
-    bytes_ += n;
-  }
 
   void Report(const Slice& name) {
     // Pretend at least one op was done in case we are running a benchmark
@@ -268,11 +266,8 @@ class Stats {
     }
     AppendWithSpace(&extra, message_);
 
-    fprintf(stdout, "%-12s : %11.3f micros/op;%s%s\n",
+    fprintf(stdout, "%-12s : %11.3f micros/op;%s%s\n", name.ToString().c_str(),
-            name.ToString().c_str(),
+            seconds_ * 1e6 / done_, (extra.empty() ? "" : " "), extra.c_str());
-            seconds_ * 1e6 / done_,
-            (extra.empty() ? "" : " "),
-            extra.c_str());
     if (FLAGS_histogram) {
       fprintf(stdout, "Microseconds per op:\n%s\n", hist_.ToString().c_str());
     }
@@ -283,8 +278,8 @@ class Stats {
 // State shared by all concurrent executions of the same benchmark.
 struct SharedState {
   port::Mutex mu;
-  port::CondVar cv;
+  port::CondVar cv GUARDED_BY(mu);
-  int total;
+  int total GUARDED_BY(mu);
 
   // Each thread goes through the following states:
   //    (1) initializing
@@ -292,11 +287,12 @@ struct SharedState {
   //    (3) running
   //    (4) done
 
-  int num_initialized;
+  int num_initialized GUARDED_BY(mu);
-  int num_done;
+  int num_done GUARDED_BY(mu);
-  bool start;
+  bool start GUARDED_BY(mu);
 
-  SharedState() : cv(&mu) { }
+  SharedState(int total)
+      : cv(&mu), total(total), num_initialized(0), num_done(0), start(false) {}
 };
 
 // Per-thread state for concurrent executions of the same benchmark.
@@ -306,10 +302,7 @@ struct ThreadState {
   Stats stats;
   SharedState* shared;
 
-  ThreadState(int index)
+  ThreadState(int index) : tid(index), rand(1000 + index), shared(nullptr) {}
-      : tid(index),
-        rand(1000 + index) {
-  }
 };
 
 }  // namespace
@@ -335,20 +328,20 @@ class Benchmark {
             static_cast<int>(FLAGS_value_size * FLAGS_compression_ratio + 0.5));
     fprintf(stdout, "Entries:    %d\n", num_);
     fprintf(stdout, "RawSize:    %.1f MB (estimated)\n",
-            ((static_cast<int64_t>(kKeySize + FLAGS_value_size) * num_)
+            ((static_cast<int64_t>(kKeySize + FLAGS_value_size) * num_) /
-             / 1048576.0));
+             1048576.0));
     fprintf(stdout, "FileSize:   %.1f MB (estimated)\n",
-            (((kKeySize + FLAGS_value_size * FLAGS_compression_ratio) * num_)
+            (((kKeySize + FLAGS_value_size * FLAGS_compression_ratio) * num_) /
-             / 1048576.0));
+             1048576.0));
     PrintWarnings();
     fprintf(stdout, "------------------------------------------------\n");
   }
 
   void PrintWarnings() {
 #if defined(__GNUC__) && !defined(__OPTIMIZE__)
-    fprintf(stdout,
+    fprintf(
-            "WARNING: Optimization is disabled: benchmarks unnecessarily slow\n"
+        stdout,
-            );
+        "WARNING: Optimization is disabled: benchmarks unnecessarily slow\n");
 #endif
 #ifndef NDEBUG
     fprintf(stdout,
@@ -366,22 +359,22 @@ class Benchmark {
   }
 
   void PrintEnvironment() {
-    fprintf(stderr, "LevelDB:    version %d.%d\n",
+    fprintf(stderr, "LevelDB:    version %d.%d\n", kMajorVersion,
-            kMajorVersion, kMinorVersion);
+            kMinorVersion);
 
 #if defined(__linux)
-    time_t now = time(NULL);
+    time_t now = time(nullptr);
     fprintf(stderr, "Date:       %s", ctime(&now));  // ctime() adds newline
 
     FILE* cpuinfo = fopen("/proc/cpuinfo", "r");
-    if (cpuinfo != NULL) {
+    if (cpuinfo != nullptr) {
       char line[1000];
       int num_cpus = 0;
       std::string cpu_type;
       std::string cache_size;
-      while (fgets(line, sizeof(line), cpuinfo) != NULL) {
+      while (fgets(line, sizeof(line), cpuinfo) != nullptr) {
         const char* sep = strchr(line, ':');
-        if (sep == NULL) {
+        if (sep == nullptr) {
           continue;
         }
         Slice key = TrimSpace(Slice(line, sep - 1 - line));
@@ -402,11 +395,11 @@ class Benchmark {
 
  public:
   Benchmark()
-  : cache_(FLAGS_cache_size >= 0 ? NewLRUCache(FLAGS_cache_size) : NULL),
+      : cache_(FLAGS_cache_size >= 0 ? NewLRUCache(FLAGS_cache_size) : nullptr),
         filter_policy_(FLAGS_bloom_bits >= 0
                            ? NewBloomFilterPolicy(FLAGS_bloom_bits)
-                   : NULL),
+                           : nullptr),
-    db_(NULL),
+        db_(nullptr),
         num_(FLAGS_num),
         value_size_(FLAGS_value_size),
         entries_per_batch_(1),
@@ -435,12 +428,12 @@ class Benchmark {
     Open();
 
     const char* benchmarks = FLAGS_benchmarks;
-    while (benchmarks != NULL) {
+    while (benchmarks != nullptr) {
       const char* sep = strchr(benchmarks, ',');
       Slice name;
-      if (sep == NULL) {
+      if (sep == nullptr) {
         name = benchmarks;
-        benchmarks = NULL;
+        benchmarks = nullptr;
       } else {
         name = Slice(benchmarks, sep - benchmarks);
         benchmarks = sep + 1;
@@ -453,7 +446,7 @@ class Benchmark {
       entries_per_batch_ = 1;
       write_options_ = WriteOptions();
 
-      void (Benchmark::*method)(ThreadState*) = NULL;
+      void (Benchmark::*method)(ThreadState*) = nullptr;
       bool fresh_db = false;
       int num_threads = FLAGS_threads;
 
@@ -510,8 +503,6 @@ class Benchmark {
         method = &Benchmark::Compact;
       } else if (name == Slice("crc32c")) {
         method = &Benchmark::Crc32c;
-      } else if (name == Slice("acquireload")) {
-        method = &Benchmark::AcquireLoad;
       } else if (name == Slice("snappycomp")) {
         method = &Benchmark::SnappyCompress;
       } else if (name == Slice("snappyuncomp")) {
@@ -523,7 +514,7 @@ class Benchmark {
       } else if (name == Slice("sstables")) {
         PrintStats("leveldb.sstables");
       } else {
-        if (name != Slice()) {  // No error message for empty name
+        if (!name.empty()) {  // No error message for empty name
           fprintf(stderr, "unknown benchmark '%s'\n", name.ToString().c_str());
         }
       }
@@ -532,16 +523,16 @@ class Benchmark {
         if (FLAGS_use_existing_db) {
           fprintf(stdout, "%-12s : skipped (--use_existing_db is true)\n",
                   name.ToString().c_str());
-          method = NULL;
+          method = nullptr;
         } else {
           delete db_;
-          db_ = NULL;
+          db_ = nullptr;
           DestroyDB(FLAGS_db, Options());
           Open();
         }
       }
 
-      if (method != NULL) {
+      if (method != nullptr) {
         RunBenchmark(num_threads, name, method);
       }
     }
@@ -585,11 +576,7 @@ class Benchmark {
 
   void RunBenchmark(int n, Slice name,
                     void (Benchmark::*method)(ThreadState*)) {
-    SharedState shared;
+    SharedState shared(n);
-    shared.total = n;
-    shared.num_initialized = 0;
-    shared.num_done = 0;
-    shared.start = false;
 
     ThreadArg* arg = new ThreadArg[n];
     for (int i = 0; i < n; i++) {
@@ -643,22 +630,6 @@ class Benchmark {
     thread->stats.AddMessage(label);
   }
 
-  void AcquireLoad(ThreadState* thread) {
-    int dummy;
-    port::AtomicPointer ap(&dummy);
-    int count = 0;
-    void *ptr = NULL;
-    thread->stats.AddMessage("(each op is 1000 loads)");
-    while (count < 100000) {
-      for (int i = 0; i < 1000; i++) {
-        ptr = ap.Acquire_Load();
-      }
-      count++;
-      thread->stats.FinishedSingleOp();
-    }
-    if (ptr == NULL) exit(1); // Disable unused variable warning.
-  }
-
   void SnappyCompress(ThreadState* thread) {
     RandomGenerator gen;
     Slice input = gen.Generate(Options().block_size);
@@ -707,7 +678,7 @@ class Benchmark {
   }
 
   void Open() {
-    assert(db_ == NULL);
+    assert(db_ == nullptr);
     Options options;
     options.env = g_env;
     options.create_if_missing = !FLAGS_use_existing_db;
@@ -733,13 +704,9 @@ class Benchmark {
     }
   }
 
-  void WriteSeq(ThreadState* thread) {
+  void WriteSeq(ThreadState* thread) { DoWrite(thread, true); }
-    DoWrite(thread, true);
-  }
 
-  void WriteRandom(ThreadState* thread) {
+  void WriteRandom(ThreadState* thread) { DoWrite(thread, false); }
-    DoWrite(thread, false);
-  }
 
   void DoWrite(ThreadState* thread, bool seq) {
     if (num_ != FLAGS_num) {
@@ -755,7 +722,7 @@ class Benchmark {
     for (int i = 0; i < num_; i += entries_per_batch_) {
       batch.Clear();
       for (int j = 0; j < entries_per_batch_; j++) {
-        const int k = seq ? i+j : (thread->rand.Next() % FLAGS_num);
+        const int k = seq ? i + j : (thread->rand.Next() % FLAGS_num);
         char key[100];
         snprintf(key, sizeof(key), "%016d", k);
         batch.Put(key, gen.Generate(value_size_));
@@ -865,7 +832,7 @@ class Benchmark {
     for (int i = 0; i < num_; i += entries_per_batch_) {
       batch.Clear();
       for (int j = 0; j < entries_per_batch_; j++) {
-        const int k = seq ? i+j : (thread->rand.Next() % FLAGS_num);
+        const int k = seq ? i + j : (thread->rand.Next() % FLAGS_num);
         char key[100];
         snprintf(key, sizeof(key), "%016d", k);
         batch.Delete(key);
@@ -879,13 +846,9 @@ class Benchmark {
     }
   }
 
-  void DeleteSeq(ThreadState* thread) {
+  void DeleteSeq(ThreadState* thread) { DoDelete(thread, true); }
-    DoDelete(thread, true);
-  }
 
-  void DeleteRandom(ThreadState* thread) {
+  void DeleteRandom(ThreadState* thread) { DoDelete(thread, false); }
-    DoDelete(thread, false);
-  }
 
   void ReadWhileWriting(ThreadState* thread) {
     if (thread->tid > 0) {
@@ -917,9 +880,7 @@ class Benchmark {
     }
   }
 
-  void Compact(ThreadState* thread) {
+  void Compact(ThreadState* thread) { db_->CompactRange(nullptr, nullptr); }
-    db_->CompactRange(NULL, NULL);
-  }
 
   void PrintStats(const char* key) {
     std::string stats;
@@ -1008,7 +969,7 @@ int main(int argc, char** argv) {
   leveldb::g_env = leveldb::Env::Default();
 
   // Choose a location for the test database if none given with --db=<path>
-  if (FLAGS_db == NULL) {
+  if (FLAGS_db == nullptr) {
     leveldb::g_env->GetTestDirectory(&default_db_path);
     default_db_path += "/dbbench";
     FLAGS_db = default_db_path.c_str();

benchmarks/db_bench_sqlite3.cc

@@ -2,9 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 
+#include <sqlite3.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <sqlite3.h>
+
 #include "util/histogram.h"
 #include "util/random.h"
 #include "util/testutil.h"
@@ -38,8 +39,7 @@ static const char* FLAGS_benchmarks =
     "fillrand100K,"
     "fillseq100K,"
     "readseq,"
-    "readrand100K,"
+    "readrand100K,";
-    ;
 
 // Number of key/values to place in database
 static int FLAGS_num = 1000000;
@@ -76,10 +76,9 @@ static bool FLAGS_transaction = true;
 static bool FLAGS_WAL_enabled = true;
 
 // Use the db with the following name.
-static const char* FLAGS_db = NULL;
+static const char* FLAGS_db = nullptr;
 
-inline
+inline static void ExecErrorCheck(int status, char* err_msg) {
-static void ExecErrorCheck(int status, char *err_msg) {
   if (status != SQLITE_OK) {
     fprintf(stderr, "SQL error: %s\n", err_msg);
     sqlite3_free(err_msg);
@@ -87,27 +86,25 @@ static void ExecErrorCheck(int status, char *err_msg) {
   }
 }
 
-inline
+inline static void StepErrorCheck(int status) {
-static void StepErrorCheck(int status) {
   if (status != SQLITE_DONE) {
     fprintf(stderr, "SQL step error: status = %d\n", status);
     exit(1);
   }
 }
 
-inline
+inline static void ErrorCheck(int status) {
-static void ErrorCheck(int status) {
   if (status != SQLITE_OK) {
     fprintf(stderr, "sqlite3 error: status = %d\n", status);
     exit(1);
   }
 }
 
-inline
+inline static void WalCheckpoint(sqlite3* db_) {
-static void WalCheckpoint(sqlite3* db_) {
   // Flush all writes to disk
   if (FLAGS_WAL_enabled) {
-    sqlite3_wal_checkpoint_v2(db_, NULL, SQLITE_CHECKPOINT_FULL, NULL, NULL);
+    sqlite3_wal_checkpoint_v2(db_, nullptr, SQLITE_CHECKPOINT_FULL, nullptr,
+                              nullptr);
   }
 }
 
@@ -152,7 +149,7 @@ static Slice TrimSpace(Slice s) {
     start++;
   }
   int limit = s.size();
-  while (limit > start && isspace(s[limit-1])) {
+  while (limit > start && isspace(s[limit - 1])) {
     limit--;
   }
   return Slice(s.data() + start, limit - start);
@@ -185,17 +182,17 @@ class Benchmark {
     fprintf(stdout, "Values:     %d bytes each\n", FLAGS_value_size);
     fprintf(stdout, "Entries:    %d\n", num_);
     fprintf(stdout, "RawSize:    %.1f MB (estimated)\n",
-            ((static_cast<int64_t>(kKeySize + FLAGS_value_size) * num_)
+            ((static_cast<int64_t>(kKeySize + FLAGS_value_size) * num_) /
-             / 1048576.0));
+             1048576.0));
     PrintWarnings();
     fprintf(stdout, "------------------------------------------------\n");
   }
 
   void PrintWarnings() {
 #if defined(__GNUC__) && !defined(__OPTIMIZE__)
-    fprintf(stdout,
+    fprintf(
-            "WARNING: Optimization is disabled: benchmarks unnecessarily slow\n"
+        stdout,
-            );
+        "WARNING: Optimization is disabled: benchmarks unnecessarily slow\n");
 #endif
 #ifndef NDEBUG
     fprintf(stdout,
@@ -207,18 +204,18 @@ class Benchmark {
     fprintf(stderr, "SQLite:     version %s\n", SQLITE_VERSION);
 
 #if defined(__linux)
-    time_t now = time(NULL);
+    time_t now = time(nullptr);
     fprintf(stderr, "Date:       %s", ctime(&now));  // ctime() adds newline
 
     FILE* cpuinfo = fopen("/proc/cpuinfo", "r");
-    if (cpuinfo != NULL) {
+    if (cpuinfo != nullptr) {
       char line[1000];
       int num_cpus = 0;
       std::string cpu_type;
       std::string cache_size;
-      while (fgets(line, sizeof(line), cpuinfo) != NULL) {
+      while (fgets(line, sizeof(line), cpuinfo) != nullptr) {
         const char* sep = strchr(line, ':');
-        if (sep == NULL) {
+        if (sep == nullptr) {
           continue;
         }
         Slice key = TrimSpace(Slice(line, sep - 1 - line));
@@ -261,13 +258,20 @@ class Benchmark {
 
     done_++;
     if (done_ >= next_report_) {
-      if      (next_report_ < 1000)   next_report_ += 100;
+      if (next_report_ < 1000)
-      else if (next_report_ < 5000)   next_report_ += 500;
+        next_report_ += 100;
-      else if (next_report_ < 10000)  next_report_ += 1000;
+      else if (next_report_ < 5000)
-      else if (next_report_ < 50000)  next_report_ += 5000;
+        next_report_ += 500;
-      else if (next_report_ < 100000) next_report_ += 10000;
+      else if (next_report_ < 10000)
-      else if (next_report_ < 500000) next_report_ += 50000;
+        next_report_ += 1000;
-      else                            next_report_ += 100000;
+      else if (next_report_ < 50000)
+        next_report_ += 5000;
+      else if (next_report_ < 100000)
+        next_report_ += 10000;
+      else if (next_report_ < 500000)
+        next_report_ += 50000;
+      else
+        next_report_ += 100000;
       fprintf(stderr, "... finished %d ops%30s\r", done_, "");
       fflush(stderr);
     }
@@ -291,10 +295,8 @@ class Benchmark {
       }
     }
 
-    fprintf(stdout, "%-12s : %11.3f micros/op;%s%s\n",
+    fprintf(stdout, "%-12s : %11.3f micros/op;%s%s\n", name.ToString().c_str(),
-            name.ToString().c_str(),
+            (finish - start_) * 1e6 / done_, (message_.empty() ? "" : " "),
-            (finish - start_) * 1e6 / done_,
-            (message_.empty() ? "" : " "),
             message_.c_str());
     if (FLAGS_histogram) {
       fprintf(stdout, "Microseconds per op:\n%s\n", hist_.ToString().c_str());
@@ -303,17 +305,11 @@ class Benchmark {
   }
 
  public:
-  enum Order {
+  enum Order { SEQUENTIAL, RANDOM };
-    SEQUENTIAL,
+  enum DBState { FRESH, EXISTING };
-    RANDOM
-  };
-  enum DBState {
-    FRESH,
-    EXISTING
-  };
 
   Benchmark()
-  : db_(NULL),
+      : db_(nullptr),
         db_num_(0),
         num_(FLAGS_num),
         reads_(FLAGS_reads < 0 ? FLAGS_num : FLAGS_reads),
@@ -345,12 +341,12 @@ class Benchmark {
     Open();
 
     const char* benchmarks = FLAGS_benchmarks;
-    while (benchmarks != NULL) {
+    while (benchmarks != nullptr) {
       const char* sep = strchr(benchmarks, ',');
       Slice name;
-      if (sep == NULL) {
+      if (sep == nullptr) {
         name = benchmarks;
-        benchmarks = NULL;
+        benchmarks = nullptr;
       } else {
         name = Slice(benchmarks, sep - benchmarks);
         benchmarks = sep + 1;
@@ -415,20 +411,18 @@ class Benchmark {
   }
 
   void Open() {
-    assert(db_ == NULL);
+    assert(db_ == nullptr);
 
     int status;
     char file_name[100];
-    char* err_msg = NULL;
+    char* err_msg = nullptr;
     db_num_++;
 
     // Open database
     std::string tmp_dir;
     Env::Default()->GetTestDirectory(&tmp_dir);
-    snprintf(file_name, sizeof(file_name),
+    snprintf(file_name, sizeof(file_name), "%s/dbbench_sqlite3-%d.db",
-             "%s/dbbench_sqlite3-%d.db",
+             tmp_dir.c_str(), db_num_);
-             tmp_dir.c_str(),
-             db_num_);
     status = sqlite3_open(file_name, &db_);
     if (status) {
       fprintf(stderr, "open error: %s\n", sqlite3_errmsg(db_));
@@ -439,7 +433,7 @@ class Benchmark {
     char cache_size[100];
     snprintf(cache_size, sizeof(cache_size), "PRAGMA cache_size = %d",
              FLAGS_num_pages);
-    status = sqlite3_exec(db_, cache_size, NULL, NULL, &err_msg);
+    status = sqlite3_exec(db_, cache_size, nullptr, nullptr, &err_msg);
     ExecErrorCheck(status, err_msg);
 
     // FLAGS_page_size is defaulted to 1024
@@ -447,7 +441,7 @@ class Benchmark {
       char page_size[100];
       snprintf(page_size, sizeof(page_size), "PRAGMA page_size = %d",
                FLAGS_page_size);
-      status = sqlite3_exec(db_, page_size, NULL, NULL, &err_msg);
+      status = sqlite3_exec(db_, page_size, nullptr, nullptr, &err_msg);
       ExecErrorCheck(status, err_msg);
     }
 
@@ -457,9 +451,10 @@ class Benchmark {
 
       // LevelDB's default cache size is a combined 4 MB
       std::string WAL_checkpoint = "PRAGMA wal_autocheckpoint = 4096";
-      status = sqlite3_exec(db_, WAL_stmt.c_str(), NULL, NULL, &err_msg);
+      status = sqlite3_exec(db_, WAL_stmt.c_str(), nullptr, nullptr, &err_msg);
       ExecErrorCheck(status, err_msg);
-      status = sqlite3_exec(db_, WAL_checkpoint.c_str(), NULL, NULL, &err_msg);
+      status =
+          sqlite3_exec(db_, WAL_checkpoint.c_str(), nullptr, nullptr, &err_msg);
       ExecErrorCheck(status, err_msg);
     }
 
@@ -467,16 +462,17 @@ class Benchmark {
     std::string locking_stmt = "PRAGMA locking_mode = EXCLUSIVE";
     std::string create_stmt =
         "CREATE TABLE test (key blob, value blob, PRIMARY KEY(key))";
-    std::string stmt_array[] = { locking_stmt, create_stmt };
+    std::string stmt_array[] = {locking_stmt, create_stmt};
     int stmt_array_length = sizeof(stmt_array) / sizeof(std::string);
     for (int i = 0; i < stmt_array_length; i++) {
-      status = sqlite3_exec(db_, stmt_array[i].c_str(), NULL, NULL, &err_msg);
+      status =
+          sqlite3_exec(db_, stmt_array[i].c_str(), nullptr, nullptr, &err_msg);
       ExecErrorCheck(status, err_msg);
     }
   }
 
-  void Write(bool write_sync, Order order, DBState state,
+  void Write(bool write_sync, Order order, DBState state, int num_entries,
-             int num_entries, int value_size, int entries_per_batch) {
+             int value_size, int entries_per_batch) {
     // Create new database if state == FRESH
     if (state == FRESH) {
       if (FLAGS_use_existing_db) {
@@ -484,7 +480,7 @@ class Benchmark {
         return;
       }
       sqlite3_close(db_);
-      db_ = NULL;
+      db_ = nullptr;
       Open();
       Start();
     }
@@ -495,7 +491,7 @@ class Benchmark {
       message_ = msg;
     }
 
-    char* err_msg = NULL;
+    char* err_msg = nullptr;
     int status;
 
     sqlite3_stmt *replace_stmt, *begin_trans_stmt, *end_trans_stmt;
@@ -504,20 +500,20 @@ class Benchmark {
     std::string end_trans_str = "END TRANSACTION;";
 
     // Check for synchronous flag in options
-    std::string sync_stmt = (write_sync) ? "PRAGMA synchronous = FULL" :
+    std::string sync_stmt =
-                                           "PRAGMA synchronous = OFF";
+        (write_sync) ? "PRAGMA synchronous = FULL" : "PRAGMA synchronous = OFF";
-    status = sqlite3_exec(db_, sync_stmt.c_str(), NULL, NULL, &err_msg);
+    status = sqlite3_exec(db_, sync_stmt.c_str(), nullptr, nullptr, &err_msg);
     ExecErrorCheck(status, err_msg);
 
     // Preparing sqlite3 statements
-    status = sqlite3_prepare_v2(db_, replace_str.c_str(), -1,
+    status = sqlite3_prepare_v2(db_, replace_str.c_str(), -1, &replace_stmt,
-                                &replace_stmt, NULL);
+                                nullptr);
     ErrorCheck(status);
     status = sqlite3_prepare_v2(db_, begin_trans_str.c_str(), -1,
-                                &begin_trans_stmt, NULL);
+                                &begin_trans_stmt, nullptr);
     ErrorCheck(status);
-    status = sqlite3_prepare_v2(db_, end_trans_str.c_str(), -1,
+    status = sqlite3_prepare_v2(db_, end_trans_str.c_str(), -1, &end_trans_stmt,
-                                &end_trans_stmt, NULL);
+                                nullptr);
     ErrorCheck(status);
 
     bool transaction = (entries_per_batch > 1);
@@ -535,16 +531,16 @@ class Benchmark {
         const char* value = gen_.Generate(value_size).data();
 
         // Create values for key-value pair
-        const int k = (order == SEQUENTIAL) ? i + j :
+        const int k =
-                      (rand_.Next() % num_entries);
+            (order == SEQUENTIAL) ? i + j : (rand_.Next() % num_entries);
         char key[100];
         snprintf(key, sizeof(key), "%016d", k);
 
         // Bind KV values into replace_stmt
         status = sqlite3_bind_blob(replace_stmt, 1, key, 16, SQLITE_STATIC);
         ErrorCheck(status);
-        status = sqlite3_bind_blob(replace_stmt, 2, value,
+        status = sqlite3_bind_blob(replace_stmt, 2, value, value_size,
-                                   value_size, SQLITE_STATIC);
+                                   SQLITE_STATIC);
         ErrorCheck(status);
 
         // Execute replace_stmt
@@ -588,12 +584,12 @@ class Benchmark {
 
     // Preparing sqlite3 statements
     status = sqlite3_prepare_v2(db_, begin_trans_str.c_str(), -1,
-                                &begin_trans_stmt, NULL);
+                                &begin_trans_stmt, nullptr);
     ErrorCheck(status);
-    status = sqlite3_prepare_v2(db_, end_trans_str.c_str(), -1,
+    status = sqlite3_prepare_v2(db_, end_trans_str.c_str(), -1, &end_trans_stmt,
-                                &end_trans_stmt, NULL);
+                                nullptr);
     ErrorCheck(status);
-    status = sqlite3_prepare_v2(db_, read_str.c_str(), -1, &read_stmt, NULL);
+    status = sqlite3_prepare_v2(db_, read_str.c_str(), -1, &read_stmt, nullptr);
     ErrorCheck(status);
 
     bool transaction = (entries_per_batch > 1);
@@ -618,7 +614,8 @@ class Benchmark {
         ErrorCheck(status);
 
         // Execute read statement
-        while ((status = sqlite3_step(read_stmt)) == SQLITE_ROW) {}
+        while ((status = sqlite3_step(read_stmt)) == SQLITE_ROW) {
+        }
         StepErrorCheck(status);
 
         // Reset SQLite statement for another use
@@ -648,10 +645,10 @@ class Benchmark {
 
   void ReadSequential() {
     int status;
-    sqlite3_stmt *pStmt;
+    sqlite3_stmt* pStmt;
     std::string read_str = "SELECT * FROM test ORDER BY key";
 
-    status = sqlite3_prepare_v2(db_, read_str.c_str(), -1, &pStmt, NULL);
+    status = sqlite3_prepare_v2(db_, read_str.c_str(), -1, &pStmt, nullptr);
     ErrorCheck(status);
     for (int i = 0; i < reads_ && SQLITE_ROW == sqlite3_step(pStmt); i++) {
       bytes_ += sqlite3_column_bytes(pStmt, 1) + sqlite3_column_bytes(pStmt, 2);
@@ -661,7 +658,6 @@ class Benchmark {
     status = sqlite3_finalize(pStmt);
     ErrorCheck(status);
   }
-
 };
 
 }  // namespace leveldb
@@ -706,7 +702,7 @@ int main(int argc, char** argv) {
   }
 
   // Choose a location for the test database if none given with --db=<path>
-  if (FLAGS_db == NULL) {
+  if (FLAGS_db == nullptr) {
     leveldb::Env::Default()->GetTestDirectory(&default_db_path);
     default_db_path += "/dbbench";
     FLAGS_db = default_db_path.c_str();

benchmarks/db_bench_tree_db.cc

@@ -2,9 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 
+#include <kcpolydb.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <kcpolydb.h>
+
 #include "util/histogram.h"
 #include "util/random.h"
 #include "util/testutil.h"
@@ -34,8 +35,7 @@ static const char* FLAGS_benchmarks =
     "fillrand100K,"
     "fillseq100K,"
     "readseq100K,"
-    "readrand100K,"
+    "readrand100K,";
-    ;
 
 // Number of key/values to place in database
 static int FLAGS_num = 1000000;
@@ -69,11 +69,9 @@ static bool FLAGS_use_existing_db = false;
 static bool FLAGS_compression = true;
 
 // Use the db with the following name.
-static const char* FLAGS_db = NULL;
+static const char* FLAGS_db = nullptr;
 
-inline
+inline static void DBSynchronize(kyotocabinet::TreeDB* db_) {
-static void DBSynchronize(kyotocabinet::TreeDB* db_)
-{
   // Synchronize will flush writes to disk
   if (!db_->synchronize()) {
     fprintf(stderr, "synchronize error: %s\n", db_->error().name());
@@ -121,7 +119,7 @@ static Slice TrimSpace(Slice s) {
     start++;
   }
   int limit = s.size();
-  while (limit > start && isspace(s[limit-1])) {
+  while (limit > start && isspace(s[limit - 1])) {
     limit--;
   }
   return Slice(s.data() + start, limit - start);
@@ -157,20 +155,20 @@ class Benchmark {
             static_cast<int>(FLAGS_value_size * FLAGS_compression_ratio + 0.5));
     fprintf(stdout, "Entries:    %d\n", num_);
     fprintf(stdout, "RawSize:    %.1f MB (estimated)\n",
-            ((static_cast<int64_t>(kKeySize + FLAGS_value_size) * num_)
+            ((static_cast<int64_t>(kKeySize + FLAGS_value_size) * num_) /
-             / 1048576.0));
+             1048576.0));
     fprintf(stdout, "FileSize:   %.1f MB (estimated)\n",
-            (((kKeySize + FLAGS_value_size * FLAGS_compression_ratio) * num_)
+            (((kKeySize + FLAGS_value_size * FLAGS_compression_ratio) * num_) /
-             / 1048576.0));
+             1048576.0));
     PrintWarnings();
     fprintf(stdout, "------------------------------------------------\n");
   }
 
   void PrintWarnings() {
 #if defined(__GNUC__) && !defined(__OPTIMIZE__)
-    fprintf(stdout,
+    fprintf(
-            "WARNING: Optimization is disabled: benchmarks unnecessarily slow\n"
+        stdout,
-            );
+        "WARNING: Optimization is disabled: benchmarks unnecessarily slow\n");
 #endif
 #ifndef NDEBUG
     fprintf(stdout,
@@ -183,18 +181,18 @@ class Benchmark {
             kyotocabinet::VERSION, kyotocabinet::LIBVER, kyotocabinet::LIBREV);
 
 #if defined(__linux)
-    time_t now = time(NULL);
+    time_t now = time(nullptr);
     fprintf(stderr, "Date:           %s", ctime(&now));  // ctime() adds newline
 
     FILE* cpuinfo = fopen("/proc/cpuinfo", "r");
-    if (cpuinfo != NULL) {
+    if (cpuinfo != nullptr) {
       char line[1000];
       int num_cpus = 0;
       std::string cpu_type;
       std::string cache_size;
-      while (fgets(line, sizeof(line), cpuinfo) != NULL) {
+      while (fgets(line, sizeof(line), cpuinfo) != nullptr) {
         const char* sep = strchr(line, ':');
-        if (sep == NULL) {
+        if (sep == nullptr) {
           continue;
         }
         Slice key = TrimSpace(Slice(line, sep - 1 - line));
@@ -237,13 +235,20 @@ class Benchmark {
 
     done_++;
     if (done_ >= next_report_) {
-      if      (next_report_ < 1000)   next_report_ += 100;
+      if (next_report_ < 1000)
-      else if (next_report_ < 5000)   next_report_ += 500;
+        next_report_ += 100;
-      else if (next_report_ < 10000)  next_report_ += 1000;
+      else if (next_report_ < 5000)
-      else if (next_report_ < 50000)  next_report_ += 5000;
+        next_report_ += 500;
-      else if (next_report_ < 100000) next_report_ += 10000;
+      else if (next_report_ < 10000)
-      else if (next_report_ < 500000) next_report_ += 50000;
+        next_report_ += 1000;
-      else                            next_report_ += 100000;
+      else if (next_report_ < 50000)
+        next_report_ += 5000;
+      else if (next_report_ < 100000)
+        next_report_ += 10000;
+      else if (next_report_ < 500000)
+        next_report_ += 50000;
+      else
+        next_report_ += 100000;
       fprintf(stderr, "... finished %d ops%30s\r", done_, "");
       fflush(stderr);
     }
@@ -267,10 +272,8 @@ class Benchmark {
       }
     }
 
-    fprintf(stdout, "%-12s : %11.3f micros/op;%s%s\n",
+    fprintf(stdout, "%-12s : %11.3f micros/op;%s%s\n", name.ToString().c_str(),
-            name.ToString().c_str(),
+            (finish - start_) * 1e6 / done_, (message_.empty() ? "" : " "),
-            (finish - start_) * 1e6 / done_,
-            (message_.empty() ? "" : " "),
             message_.c_str());
     if (FLAGS_histogram) {
       fprintf(stdout, "Microseconds per op:\n%s\n", hist_.ToString().c_str());
@@ -279,17 +282,11 @@ class Benchmark {
   }
 
  public:
-  enum Order {
+  enum Order { SEQUENTIAL, RANDOM };
-    SEQUENTIAL,
+  enum DBState { FRESH, EXISTING };
-    RANDOM
-  };
-  enum DBState {
-    FRESH,
-    EXISTING
-  };
 
   Benchmark()
-  : db_(NULL),
+      : db_(nullptr),
         num_(FLAGS_num),
         reads_(FLAGS_reads < 0 ? FLAGS_num : FLAGS_reads),
         bytes_(0),
@@ -321,12 +318,12 @@ class Benchmark {
     Open(false);
 
     const char* benchmarks = FLAGS_benchmarks;
-    while (benchmarks != NULL) {
+    while (benchmarks != nullptr) {
       const char* sep = strchr(benchmarks, ',');
       Slice name;
-      if (sep == NULL) {
+      if (sep == nullptr) {
         name = benchmarks;
-        benchmarks = NULL;
+        benchmarks = nullptr;
       } else {
         name = Slice(benchmarks, sep - benchmarks);
         benchmarks = sep + 1;
@@ -387,7 +384,7 @@ class Benchmark {
 
  private:
   void Open(bool sync) {
-    assert(db_ == NULL);
+    assert(db_ == nullptr);
 
     // Initialize db_
     db_ = new kyotocabinet::TreeDB();
@@ -395,16 +392,14 @@ class Benchmark {
     db_num_++;
     std::string test_dir;
     Env::Default()->GetTestDirectory(&test_dir);
-    snprintf(file_name, sizeof(file_name),
+    snprintf(file_name, sizeof(file_name), "%s/dbbench_polyDB-%d.kct",
-             "%s/dbbench_polyDB-%d.kct",
+             test_dir.c_str(), db_num_);
-             test_dir.c_str(),
-             db_num_);
 
     // Create tuning options and open the database
-    int open_options = kyotocabinet::PolyDB::OWRITER |
+    int open_options =
-                       kyotocabinet::PolyDB::OCREATE;
+        kyotocabinet::PolyDB::OWRITER | kyotocabinet::PolyDB::OCREATE;
-    int tune_options = kyotocabinet::TreeDB::TSMALL |
+    int tune_options =
-        kyotocabinet::TreeDB::TLINEAR;
+        kyotocabinet::TreeDB::TSMALL | kyotocabinet::TreeDB::TLINEAR;
     if (FLAGS_compression) {
       tune_options |= kyotocabinet::TreeDB::TCOMPRESS;
       db_->tune_compressor(&comp_);
@@ -412,7 +407,7 @@ class Benchmark {
     db_->tune_options(tune_options);
     db_->tune_page_cache(FLAGS_cache_size);
     db_->tune_page(FLAGS_page_size);
-    db_->tune_map(256LL<<20);
+    db_->tune_map(256LL << 20);
     if (sync) {
       open_options |= kyotocabinet::PolyDB::OAUTOSYNC;
     }
@@ -421,8 +416,8 @@ class Benchmark {
     }
   }
 
-  void Write(bool sync, Order order, DBState state,
+  void Write(bool sync, Order order, DBState state, int num_entries,
-             int num_entries, int value_size, int entries_per_batch) {
+             int value_size, int entries_per_batch) {
     // Create new database if state == FRESH
     if (state == FRESH) {
       if (FLAGS_use_existing_db) {
@@ -430,7 +425,7 @@ class Benchmark {
         return;
       }
       delete db_;
-      db_ = NULL;
+      db_ = nullptr;
       Open(sync);
       Start();  // Do not count time taken to destroy/open
     }
@@ -442,8 +437,7 @@ class Benchmark {
     }
 
     // Write to database
-    for (int i = 0; i < num_entries; i++)
+    for (int i = 0; i < num_entries; i++) {
-    {
       const int k = (order == SEQUENTIAL) ? i : (rand_.Next() % num_entries);
       char key[100];
       snprintf(key, sizeof(key), "%016d", k);
@@ -516,7 +510,7 @@ int main(int argc, char** argv) {
   }
 
   // Choose a location for the test database if none given with --db=<path>
-  if (FLAGS_db == NULL) {
+  if (FLAGS_db == nullptr) {
     leveldb::Env::Default()->GetTestDirectory(&default_db_path);
     default_db_path += "/dbbench";
     FLAGS_db = default_db_path.c_str();

build_detect_platform

@@ -1,259 +0,0 @@
-#!/bin/sh
-#
-# Detects OS we're compiling on and outputs a file specified by the first
-# argument, which in turn gets read while processing Makefile.
-#
-# The output will set the following variables:
-#   CC                          C Compiler path
-#   CXX                         C++ Compiler path
-#   PLATFORM_LDFLAGS            Linker flags
-#   PLATFORM_LIBS               Libraries flags
-#   PLATFORM_SHARED_EXT         Extension for shared libraries
-#   PLATFORM_SHARED_LDFLAGS     Flags for building shared library
-#                               This flag is embedded just before the name
-#                               of the shared library without intervening spaces
-#   PLATFORM_SHARED_CFLAGS      Flags for compiling objects for shared library
-#   PLATFORM_CCFLAGS            C compiler flags
-#   PLATFORM_CXXFLAGS           C++ compiler flags.  Will contain:
-#   PLATFORM_SHARED_VERSIONED   Set to 'true' if platform supports versioned
-#                               shared libraries, empty otherwise.
-#
-# The PLATFORM_CCFLAGS and PLATFORM_CXXFLAGS might include the following:
-#
-#       -DLEVELDB_ATOMIC_PRESENT     if <atomic> is present
-#       -DLEVELDB_PLATFORM_POSIX     for Posix-based platforms
-#       -DSNAPPY                     if the Snappy library is present
-#
-
-OUTPUT=$1
-PREFIX=$2
-if test -z "$OUTPUT" || test -z "$PREFIX"; then
-  echo "usage: $0 <output-filename> <directory_prefix>" >&2
-  exit 1
-fi
-
-# Delete existing output, if it exists
-rm -f $OUTPUT
-touch $OUTPUT
-
-if test -z "$CC"; then
-    CC=cc
-fi
-
-if test -z "$CXX"; then
-    CXX=g++
-fi
-
-if test -z "$TMPDIR"; then
-    TMPDIR=/tmp
-fi
-
-# Detect OS
-if test -z "$TARGET_OS"; then
-    TARGET_OS=`uname -s`
-fi
-
-COMMON_FLAGS=
-CROSS_COMPILE=
-PLATFORM_CCFLAGS=
-PLATFORM_CXXFLAGS=
-PLATFORM_LDFLAGS=
-PLATFORM_LIBS=
-PLATFORM_SHARED_EXT="so"
-PLATFORM_SHARED_LDFLAGS="-shared -Wl,-soname -Wl,"
-PLATFORM_SHARED_CFLAGS="-fPIC"
-PLATFORM_SHARED_VERSIONED=true
-PLATFORM_SSEFLAGS=
-
-MEMCMP_FLAG=
-if [ "$CXX" = "g++" ]; then
-    # Use libc's memcmp instead of GCC's memcmp.  This results in ~40%
-    # performance improvement on readrandom under gcc 4.4.3 on Linux/x86.
-    MEMCMP_FLAG="-fno-builtin-memcmp"
-fi
-
-case "$TARGET_OS" in
-    CYGWIN_*)
-        PLATFORM=OS_LINUX
-        COMMON_FLAGS="$MEMCMP_FLAG -lpthread -DOS_LINUX -DCYGWIN"
-        PLATFORM_LDFLAGS="-lpthread"
-        PORT_FILE=port/port_posix.cc
-        PORT_SSE_FILE=port/port_posix_sse.cc
-        ;;
-    Darwin)
-        PLATFORM=OS_MACOSX
-        COMMON_FLAGS="$MEMCMP_FLAG -DOS_MACOSX"
-        PLATFORM_SHARED_EXT=dylib
-        [ -z "$INSTALL_PATH" ] && INSTALL_PATH=`pwd`
-        PLATFORM_SHARED_LDFLAGS="-dynamiclib -install_name $INSTALL_PATH/"
-        PORT_FILE=port/port_posix.cc
-        PORT_SSE_FILE=port/port_posix_sse.cc
-        ;;
-    Linux)
-        PLATFORM=OS_LINUX
-        COMMON_FLAGS="$MEMCMP_FLAG -pthread -DOS_LINUX"
-        PLATFORM_LDFLAGS="-pthread"
-        PORT_FILE=port/port_posix.cc
-        PORT_SSE_FILE=port/port_posix_sse.cc
-        ;;
-    SunOS)
-        PLATFORM=OS_SOLARIS
-        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_SOLARIS"
-        PLATFORM_LIBS="-lpthread -lrt"
-        PORT_FILE=port/port_posix.cc
-        PORT_SSE_FILE=port/port_posix_sse.cc
-        ;;
-    FreeBSD)
-        PLATFORM=OS_FREEBSD
-        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_FREEBSD"
-        PLATFORM_LIBS="-lpthread"
-        PORT_FILE=port/port_posix.cc
-        PORT_SSE_FILE=port/port_posix_sse.cc
-        ;;
-    GNU/kFreeBSD)
-        PLATFORM=OS_KFREEBSD
-        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_KFREEBSD"
-        PLATFORM_LIBS="-lpthread"
-        PORT_FILE=port/port_posix.cc
-        ;;
-    NetBSD)
-        PLATFORM=OS_NETBSD
-        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_NETBSD"
-        PLATFORM_LIBS="-lpthread -lgcc_s"
-        PORT_FILE=port/port_posix.cc
-        PORT_SSE_FILE=port/port_posix_sse.cc
-        ;;
-    OpenBSD)
-        PLATFORM=OS_OPENBSD
-        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_OPENBSD"
-        PLATFORM_LDFLAGS="-pthread"
-        PORT_FILE=port/port_posix.cc
-        PORT_SSE_FILE=port/port_posix_sse.cc
-        ;;
-    DragonFly)
-        PLATFORM=OS_DRAGONFLYBSD
-        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_DRAGONFLYBSD"
-        PLATFORM_LIBS="-lpthread"
-        PORT_FILE=port/port_posix.cc
-        PORT_SSE_FILE=port/port_posix_sse.cc
-        ;;
-    OS_ANDROID_CROSSCOMPILE)
-        PLATFORM=OS_ANDROID
-        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_ANDROID -DLEVELDB_PLATFORM_POSIX"
-        PLATFORM_LDFLAGS=""  # All pthread features are in the Android C library
-        PORT_FILE=port/port_posix.cc
-        PORT_SSE_FILE=port/port_posix_sse.cc
-        CROSS_COMPILE=true
-        ;;
-    HP-UX)
-        PLATFORM=OS_HPUX
-        COMMON_FLAGS="$MEMCMP_FLAG -D_REENTRANT -DOS_HPUX"
-        PLATFORM_LDFLAGS="-pthread"
-        PORT_FILE=port/port_posix.cc
-        PORT_SSE_FILE=port/port_posix_sse.cc
-        # man ld: +h internal_name
-        PLATFORM_SHARED_LDFLAGS="-shared -Wl,+h -Wl,"
-        ;;
-    IOS)
-        PLATFORM=IOS
-        COMMON_FLAGS="$MEMCMP_FLAG -DOS_MACOSX"
-        [ -z "$INSTALL_PATH" ] && INSTALL_PATH=`pwd`
-        PORT_FILE=port/port_posix.cc
-        PORT_SSE_FILE=port/port_posix_sse.cc
-        PLATFORM_SHARED_EXT=
-        PLATFORM_SHARED_LDFLAGS=
-        PLATFORM_SHARED_CFLAGS=
-        PLATFORM_SHARED_VERSIONED=
-        ;;
-    OS_WINDOWS_CROSSCOMPILE | NATIVE_WINDOWS)
-        PLATFORM=OS_WINDOWS
-        COMMON_FLAGS="-fno-builtin-memcmp -D_REENTRANT -DOS_WINDOWS -DLEVELDB_PLATFORM_WINDOWS -DWINVER=0x0500 -D__USE_MINGW_ANSI_STDIO=1"
-        PLATFORM_SOURCES="util/env_win.cc"
-        PLATFORM_LIBS="-lshlwapi"
-        PORT_FILE=port/port_win.cc
-        CROSS_COMPILE=true
-        ;;
-    *)
-        echo "Unknown platform!" >&2
-        exit 1
-esac
-
-# We want to make a list of all cc files within util, db, table, and helpers
-# except for the test and benchmark files. By default, find will output a list
-# of all files matching either rule, so we need to append -print to make the
-# prune take effect.
-DIRS="$PREFIX/db $PREFIX/util $PREFIX/table"
-
-set -f # temporarily disable globbing so that our patterns aren't expanded
-PRUNE_TEST="-name *test*.cc -prune"
-PRUNE_BENCH="-name *_bench.cc -prune"
-PRUNE_TOOL="-name leveldbutil.cc -prune"
-PORTABLE_FILES=`find $DIRS $PRUNE_TEST -o $PRUNE_BENCH -o $PRUNE_TOOL -o -name '*.cc' -print | sort | sed "s,^$PREFIX/,," | tr "\n" " "`
-
-set +f # re-enable globbing
-
-# The sources consist of the portable files, plus the platform-specific port
-# file.
-echo "SOURCES=$PORTABLE_FILES $PORT_FILE $PORT_SSE_FILE" >> $OUTPUT
-echo "MEMENV_SOURCES=helpers/memenv/memenv.cc" >> $OUTPUT
-
-if [ "$CROSS_COMPILE" = "true" ]; then
-    # Cross-compiling; do not try any compilation tests.
-    true
-else
-    CXXOUTPUT="${TMPDIR}/leveldb_build_detect_platform-cxx.$$"
-
-    # If -std=c++0x works, use <atomic> as fallback for when memory barriers
-    # are not available.
-    $CXX $CXXFLAGS -std=c++0x -x c++ - -o $CXXOUTPUT 2>/dev/null  <<EOF
-      #include <atomic>
-      int main() {}
-EOF
-    if [ "$?" = 0 ]; then
-        COMMON_FLAGS="$COMMON_FLAGS -DLEVELDB_PLATFORM_POSIX -DLEVELDB_ATOMIC_PRESENT"
-        PLATFORM_CXXFLAGS="-std=c++0x"
-    else
-        COMMON_FLAGS="$COMMON_FLAGS -DLEVELDB_PLATFORM_POSIX"
-    fi
-
-    # Test whether tcmalloc is available
-    $CXX $CXXFLAGS -x c++ - -o $CXXOUTPUT -ltcmalloc 2>/dev/null  <<EOF
-      int main() {}
-EOF
-    if [ "$?" = 0 ]; then
-        PLATFORM_LIBS="$PLATFORM_LIBS -ltcmalloc"
-    fi
-
-    rm -f $CXXOUTPUT 2>/dev/null
-
-    # Test if gcc SSE 4.2 is supported
-    $CXX $CXXFLAGS -x c++ - -o $CXXOUTPUT -msse4.2 2>/dev/null  <<EOF
-      int main() {}
-EOF
-    if [ "$?" = 0 ]; then
-        PLATFORM_SSEFLAGS="-msse4.2"
-    fi
-
-    rm -f $CXXOUTPUT 2>/dev/null
-fi
-
-# Use the SSE 4.2 CRC32C intrinsics iff runtime checks indicate compiler supports them.
-if [ -n "$PLATFORM_SSEFLAGS" ]; then
-    PLATFORM_SSEFLAGS="$PLATFORM_SSEFLAGS -DLEVELDB_PLATFORM_POSIX_SSE"
-fi
-
-PLATFORM_CCFLAGS="$PLATFORM_CCFLAGS $COMMON_FLAGS"
-PLATFORM_CXXFLAGS="$PLATFORM_CXXFLAGS $COMMON_FLAGS"
-
-echo "CC=$CC" >> $OUTPUT
-echo "CXX=$CXX" >> $OUTPUT
-echo "PLATFORM=$PLATFORM" >> $OUTPUT
-echo "PLATFORM_LDFLAGS=$PLATFORM_LDFLAGS" >> $OUTPUT
-echo "PLATFORM_LIBS=$PLATFORM_LIBS" >> $OUTPUT
-echo "PLATFORM_CCFLAGS=$PLATFORM_CCFLAGS" >> $OUTPUT
-echo "PLATFORM_CXXFLAGS=$PLATFORM_CXXFLAGS" >> $OUTPUT
-echo "PLATFORM_SSEFLAGS=$PLATFORM_SSEFLAGS" >> $OUTPUT
-echo "PLATFORM_SHARED_CFLAGS=$PLATFORM_SHARED_CFLAGS" >> $OUTPUT
-echo "PLATFORM_SHARED_EXT=$PLATFORM_SHARED_EXT" >> $OUTPUT
-echo "PLATFORM_SHARED_LDFLAGS=$PLATFORM_SHARED_LDFLAGS" >> $OUTPUT
-echo "PLATFORM_SHARED_VERSIONED=$PLATFORM_SHARED_VERSIONED" >> $OUTPUT

cmake/leveldbConfig.cmake

@@ -0,0 +1 @@
+include("${CMAKE_CURRENT_LIST_DIR}/leveldbTargets.cmake")

db/autocompact_test.cc

@@ -2,9 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 
-#include "leveldb/db.h"
 #include "db/db_impl.h"
 #include "leveldb/cache.h"
+#include "leveldb/db.h"
 #include "util/testharness.h"
 #include "util/testutil.h"
 
@@ -12,11 +12,6 @@ namespace leveldb {
 
 class AutoCompactTest {
  public:
-  std::string dbname_;
-  Cache* tiny_cache_;
-  Options options_;
-  DB* db_;
-
   AutoCompactTest() {
     dbname_ = test::TmpDir() + "/autocompact_test";
     tiny_cache_ = NewLRUCache(100);
@@ -47,6 +42,12 @@ class AutoCompactTest {
   }
 
   void DoReads(int n);
+
+ private:
+  std::string dbname_;
+  Cache* tiny_cache_;
+  Options options_;
+  DB* db_;
 };
 
 static const int kValueSize = 200 * 1024;
@@ -81,17 +82,16 @@ void AutoCompactTest::DoReads(int n) {
     ASSERT_LT(read, 100) << "Taking too long to compact";
     Iterator* iter = db_->NewIterator(ReadOptions());
     for (iter->SeekToFirst();
-         iter->Valid() && iter->key().ToString() < limit_key;
+         iter->Valid() && iter->key().ToString() < limit_key; iter->Next()) {
-         iter->Next()) {
       // Drop data
     }
     delete iter;
     // Wait a little bit to allow any triggered compactions to complete.
     Env::Default()->SleepForMicroseconds(1000000);
     uint64_t size = Size(Key(0), Key(n));
-    fprintf(stderr, "iter %3d => %7.3f MB [other %7.3f MB]\n",
+    fprintf(stderr, "iter %3d => %7.3f MB [other %7.3f MB]\n", read + 1,
-            read+1, size/1048576.0, Size(Key(n), Key(kCount))/1048576.0);
+            size / 1048576.0, Size(Key(n), Key(kCount)) / 1048576.0);
-    if (size <= initial_size/10) {
+    if (size <= initial_size / 10) {
       break;
     }
   }
@@ -100,19 +100,13 @@ void AutoCompactTest::DoReads(int n) {
   // is pretty much unchanged.
   const int64_t final_other_size = Size(Key(n), Key(kCount));
   ASSERT_LE(final_other_size, initial_other_size + 1048576);
-  ASSERT_GE(final_other_size, initial_other_size/5 - 1048576);
+  ASSERT_GE(final_other_size, initial_other_size / 5 - 1048576);
 }
 
-TEST(AutoCompactTest, ReadAll) {
+TEST(AutoCompactTest, ReadAll) { DoReads(kCount); }
-  DoReads(kCount);
-}
 
-TEST(AutoCompactTest, ReadHalf) {
+TEST(AutoCompactTest, ReadHalf) { DoReads(kCount / 2); }
-  DoReads(kCount/2);
-}
 
 }  // namespace leveldb
 
-int main(int argc, char** argv) {
+int main(int argc, char** argv) { return leveldb::test::RunAllTests(); }
-  return leveldb::test::RunAllTests();
-}

db/builder.cc

@@ -4,8 +4,8 @@
 
 #include "db/builder.h"
 
-#include "db/filename.h"
 #include "db/dbformat.h"
+#include "db/filename.h"
 #include "db/table_cache.h"
 #include "db/version_edit.h"
 #include "leveldb/db.h"
@@ -14,12 +14,8 @@
 
 namespace leveldb {
 
-Status BuildTable(const std::string& dbname,
+Status BuildTable(const std::string& dbname, Env* env, const Options& options,
-                  Env* env,
+                  TableCache* table_cache, Iterator* iter, FileMetaData* meta) {
-                  const Options& options,
-                  TableCache* table_cache,
-                  Iterator* iter,
-                  FileMetaData* meta) {
   Status s;
   meta->file_size = 0;
   iter->SeekToFirst();
@@ -41,15 +37,11 @@ Status BuildTable(const std::string& dbname,
     }
 
     // Finish and check for builder errors
-    if (s.ok()) {
     s = builder->Finish();
     if (s.ok()) {
       meta->file_size = builder->FileSize();
       assert(meta->file_size > 0);
     }
-    } else {
-      builder->Abandon();
-    }
     delete builder;
 
     // Finish and check for file errors
@@ -60,12 +52,11 @@ Status BuildTable(const std::string& dbname,
       s = file->Close();
     }
     delete file;
-    file = NULL;
+    file = nullptr;
 
     if (s.ok()) {
       // Verify that the table is usable
-      Iterator* it = table_cache->NewIterator(ReadOptions(),
+      Iterator* it = table_cache->NewIterator(ReadOptions(), meta->number,
-                                              meta->number,
                                               meta->file_size);
       s = it->status();
       delete it;

db/builder.h

@@ -22,12 +22,8 @@ class VersionEdit;
 // *meta will be filled with metadata about the generated table.
 // If no data is present in *iter, meta->file_size will be set to
 // zero, and no Table file will be produced.
-extern Status BuildTable(const std::string& dbname,
+Status BuildTable(const std::string& dbname, Env* env, const Options& options,
-                         Env* env,
+                  TableCache* table_cache, Iterator* iter, FileMetaData* meta);
-                         const Options& options,
-                         TableCache* table_cache,
-                         Iterator* iter,
-                         FileMetaData* meta);
 
 }  // namespace leveldb
 

db/c.cc

@@ -4,10 +4,9 @@
 
 #include "leveldb/c.h"
 
-#include <stdlib.h>
+#include <cstdint>
-#ifndef WIN32
+#include <cstdlib>
-#include <unistd.h>
+
-#endif
 #include "leveldb/cache.h"
 #include "leveldb/comparator.h"
 #include "leveldb/db.h"
@@ -45,69 +44,72 @@ using leveldb::WriteOptions;
 
 extern "C" {
 
-struct leveldb_t              { DB*               rep; };
+struct leveldb_t {
-struct leveldb_iterator_t     { Iterator*         rep; };
+  DB* rep;
-struct leveldb_writebatch_t   { WriteBatch        rep; };
+};
-struct leveldb_snapshot_t     { const Snapshot*   rep; };
+struct leveldb_iterator_t {
-struct leveldb_readoptions_t  { ReadOptions       rep; };
+  Iterator* rep;
-struct leveldb_writeoptions_t { WriteOptions      rep; };
+};
-struct leveldb_options_t      { Options           rep; };
+struct leveldb_writebatch_t {
-struct leveldb_cache_t        { Cache*            rep; };
+  WriteBatch rep;
-struct leveldb_seqfile_t      { SequentialFile*   rep; };
+};
-struct leveldb_randomfile_t   { RandomAccessFile* rep; };
+struct leveldb_snapshot_t {
-struct leveldb_writablefile_t { WritableFile*     rep; };
+  const Snapshot* rep;
-struct leveldb_logger_t       { Logger*           rep; };
+};
-struct leveldb_filelock_t     { FileLock*         rep; };
+struct leveldb_readoptions_t {
+  ReadOptions rep;
+};
+struct leveldb_writeoptions_t {
+  WriteOptions rep;
+};
+struct leveldb_options_t {
+  Options rep;
+};
+struct leveldb_cache_t {
+  Cache* rep;
+};
+struct leveldb_seqfile_t {
+  SequentialFile* rep;
+};
+struct leveldb_randomfile_t {
+  RandomAccessFile* rep;
+};
+struct leveldb_writablefile_t {
+  WritableFile* rep;
+};
+struct leveldb_logger_t {
+  Logger* rep;
+};
+struct leveldb_filelock_t {
+  FileLock* rep;
+};
 
 struct leveldb_comparator_t : public Comparator {
-  void* state_;
+  ~leveldb_comparator_t() override { (*destructor_)(state_); }
-  void (*destructor_)(void*);
-  int (*compare_)(
-      void*,
-      const char* a, size_t alen,
-      const char* b, size_t blen);
-  const char* (*name_)(void*);
 
-  virtual ~leveldb_comparator_t() {
+  int Compare(const Slice& a, const Slice& b) const override {
-    (*destructor_)(state_);
-  }
-
-  virtual int Compare(const Slice& a, const Slice& b) const {
     return (*compare_)(state_, a.data(), a.size(), b.data(), b.size());
   }
 
-  virtual const char* Name() const {
+  const char* Name() const override { return (*name_)(state_); }
-    return (*name_)(state_);
-  }
 
   // No-ops since the C binding does not support key shortening methods.
-  virtual void FindShortestSeparator(std::string*, const Slice&) const { }
+  void FindShortestSeparator(std::string*, const Slice&) const override {}
-  virtual void FindShortSuccessor(std::string* key) const { }
+  void FindShortSuccessor(std::string* key) const override {}
+
+  void* state_;
+  void (*destructor_)(void*);
+  int (*compare_)(void*, const char* a, size_t alen, const char* b,
+                  size_t blen);
+  const char* (*name_)(void*);
 };
 
 struct leveldb_filterpolicy_t : public FilterPolicy {
-  void* state_;
+  ~leveldb_filterpolicy_t() override { (*destructor_)(state_); }
-  void (*destructor_)(void*);
-  const char* (*name_)(void*);
-  char* (*create_)(
-      void*,
-      const char* const* key_array, const size_t* key_length_array,
-      int num_keys,
-      size_t* filter_length);
-  unsigned char (*key_match_)(
-      void*,
-      const char* key, size_t length,
-      const char* filter, size_t filter_length);
 
-  virtual ~leveldb_filterpolicy_t() {
+  const char* Name() const override { return (*name_)(state_); }
-    (*destructor_)(state_);
-  }
 
-  virtual const char* Name() const {
+  void CreateFilter(const Slice* keys, int n, std::string* dst) const override {
-    return (*name_)(state_);
-  }
-
-  virtual void CreateFilter(const Slice* keys, int n, std::string* dst) const {
     std::vector<const char*> key_pointers(n);
     std::vector<size_t> key_sizes(n);
     for (int i = 0; i < n; i++) {
@@ -120,10 +122,19 @@ struct leveldb_filterpolicy_t : public FilterPolicy {
     free(filter);
   }
 
-  virtual bool KeyMayMatch(const Slice& key, const Slice& filter) const {
+  bool KeyMayMatch(const Slice& key, const Slice& filter) const override {
-    return (*key_match_)(state_, key.data(), key.size(),
+    return (*key_match_)(state_, key.data(), key.size(), filter.data(),
-                         filter.data(), filter.size());
+                         filter.size());
   }
+
+  void* state_;
+  void (*destructor_)(void*);
+  const char* (*name_)(void*);
+  char* (*create_)(void*, const char* const* key_array,
+                   const size_t* key_length_array, int num_keys,
+                   size_t* filter_length);
+  uint8_t (*key_match_)(void*, const char* key, size_t length,
+                        const char* filter, size_t filter_length);
 };
 
 struct leveldb_env_t {
@@ -132,10 +143,10 @@ struct leveldb_env_t {
 };
 
 static bool SaveError(char** errptr, const Status& s) {
-  assert(errptr != NULL);
+  assert(errptr != nullptr);
   if (s.ok()) {
     return false;
-  } else if (*errptr == NULL) {
+  } else if (*errptr == nullptr) {
     *errptr = strdup(s.ToString().c_str());
   } else {
     // TODO(sanjay): Merge with existing error?
@@ -151,13 +162,11 @@ static char* CopyString(const std::string& str) {
   return result;
 }
 
-leveldb_t* leveldb_open(
+leveldb_t* leveldb_open(const leveldb_options_t* options, const char* name,
-    const leveldb_options_t* options,
-    const char* name,
                         char** errptr) {
   DB* db;
   if (SaveError(errptr, DB::Open(options->rep, std::string(name), &db))) {
-    return NULL;
+    return nullptr;
   }
   leveldb_t* result = new leveldb_t;
   result->rep = db;
@@ -169,40 +178,27 @@ void leveldb_close(leveldb_t* db) {
   delete db;
 }
 
-void leveldb_put(
+void leveldb_put(leveldb_t* db, const leveldb_writeoptions_t* options,
-    leveldb_t* db,
+                 const char* key, size_t keylen, const char* val, size_t vallen,
-    const leveldb_writeoptions_t* options,
-    const char* key, size_t keylen,
-    const char* val, size_t vallen,
                  char** errptr) {
   SaveError(errptr,
             db->rep->Put(options->rep, Slice(key, keylen), Slice(val, vallen)));
 }
 
-void leveldb_delete(
+void leveldb_delete(leveldb_t* db, const leveldb_writeoptions_t* options,
-    leveldb_t* db,
+                    const char* key, size_t keylen, char** errptr) {
-    const leveldb_writeoptions_t* options,
-    const char* key, size_t keylen,
-    char** errptr) {
   SaveError(errptr, db->rep->Delete(options->rep, Slice(key, keylen)));
 }
 
-
+void leveldb_write(leveldb_t* db, const leveldb_writeoptions_t* options,
-void leveldb_write(
+                   leveldb_writebatch_t* batch, char** errptr) {
-    leveldb_t* db,
-    const leveldb_writeoptions_t* options,
-    leveldb_writebatch_t* batch,
-    char** errptr) {
   SaveError(errptr, db->rep->Write(options->rep, &batch->rep));
 }
 
-char* leveldb_get(
+char* leveldb_get(leveldb_t* db, const leveldb_readoptions_t* options,
-    leveldb_t* db,
+                  const char* key, size_t keylen, size_t* vallen,
-    const leveldb_readoptions_t* options,
-    const char* key, size_t keylen,
-    size_t* vallen,
                   char** errptr) {
-  char* result = NULL;
+  char* result = nullptr;
   std::string tmp;
   Status s = db->rep->Get(options->rep, Slice(key, keylen), &tmp);
   if (s.ok()) {
@@ -218,44 +214,39 @@ char* leveldb_get(
 }
 
 leveldb_iterator_t* leveldb_create_iterator(
-    leveldb_t* db,
+    leveldb_t* db, const leveldb_readoptions_t* options) {
-    const leveldb_readoptions_t* options) {
   leveldb_iterator_t* result = new leveldb_iterator_t;
   result->rep = db->rep->NewIterator(options->rep);
   return result;
 }
 
-const leveldb_snapshot_t* leveldb_create_snapshot(
+const leveldb_snapshot_t* leveldb_create_snapshot(leveldb_t* db) {
-    leveldb_t* db) {
   leveldb_snapshot_t* result = new leveldb_snapshot_t;
   result->rep = db->rep->GetSnapshot();
   return result;
 }
 
-void leveldb_release_snapshot(
+void leveldb_release_snapshot(leveldb_t* db,
-    leveldb_t* db,
                               const leveldb_snapshot_t* snapshot) {
   db->rep->ReleaseSnapshot(snapshot->rep);
   delete snapshot;
 }
 
-char* leveldb_property_value(
+char* leveldb_property_value(leveldb_t* db, const char* propname) {
-    leveldb_t* db,
-    const char* propname) {
   std::string tmp;
   if (db->rep->GetProperty(Slice(propname), &tmp)) {
     // We use strdup() since we expect human readable output.
     return strdup(tmp.c_str());
   } else {
-    return NULL;
+    return nullptr;
   }
 }
 
-void leveldb_approximate_sizes(
+void leveldb_approximate_sizes(leveldb_t* db, int num_ranges,
-    leveldb_t* db,
+                               const char* const* range_start_key,
-    int num_ranges,
+                               const size_t* range_start_key_len,
-    const char* const* range_start_key, const size_t* range_start_key_len,
+                               const char* const* range_limit_key,
-    const char* const* range_limit_key, const size_t* range_limit_key_len,
+                               const size_t* range_limit_key_len,
                                uint64_t* sizes) {
   Range* ranges = new Range[num_ranges];
   for (int i = 0; i < num_ranges; i++) {
@@ -266,27 +257,22 @@ void leveldb_approximate_sizes(
   delete[] ranges;
 }
 
-void leveldb_compact_range(
+void leveldb_compact_range(leveldb_t* db, const char* start_key,
-    leveldb_t* db,
+                           size_t start_key_len, const char* limit_key,
-    const char* start_key, size_t start_key_len,
+                           size_t limit_key_len) {
-    const char* limit_key, size_t limit_key_len) {
   Slice a, b;
   db->rep->CompactRange(
-      // Pass NULL Slice if corresponding "const char*" is NULL
+      // Pass null Slice if corresponding "const char*" is null
-      (start_key ? (a = Slice(start_key, start_key_len), &a) : NULL),
+      (start_key ? (a = Slice(start_key, start_key_len), &a) : nullptr),
-      (limit_key ? (b = Slice(limit_key, limit_key_len), &b) : NULL));
+      (limit_key ? (b = Slice(limit_key, limit_key_len), &b) : nullptr));
 }
 
-void leveldb_destroy_db(
+void leveldb_destroy_db(const leveldb_options_t* options, const char* name,
-    const leveldb_options_t* options,
-    const char* name,
                         char** errptr) {
   SaveError(errptr, DestroyDB(name, options->rep));
 }
 
-void leveldb_repair_db(
+void leveldb_repair_db(const leveldb_options_t* options, const char* name,
-    const leveldb_options_t* options,
-    const char* name,
                        char** errptr) {
   SaveError(errptr, RepairDB(name, options->rep));
 }
@@ -296,7 +282,7 @@ void leveldb_iter_destroy(leveldb_iterator_t* iter) {
   delete iter;
 }
 
-unsigned char leveldb_iter_valid(const leveldb_iterator_t* iter) {
+uint8_t leveldb_iter_valid(const leveldb_iterator_t* iter) {
   return iter->rep->Valid();
 }
 
@@ -312,13 +298,9 @@ void leveldb_iter_seek(leveldb_iterator_t* iter, const char* k, size_t klen) {
   iter->rep->Seek(Slice(k, klen));
 }
 
-void leveldb_iter_next(leveldb_iterator_t* iter) {
+void leveldb_iter_next(leveldb_iterator_t* iter) { iter->rep->Next(); }
-  iter->rep->Next();
-}
 
-void leveldb_iter_prev(leveldb_iterator_t* iter) {
+void leveldb_iter_prev(leveldb_iterator_t* iter) { iter->rep->Prev(); }
-  iter->rep->Prev();
-}
 
 const char* leveldb_iter_key(const leveldb_iterator_t* iter, size_t* klen) {
   Slice s = iter->rep->key();
@@ -340,41 +322,34 @@ leveldb_writebatch_t* leveldb_writebatch_create() {
   return new leveldb_writebatch_t;
 }
 
-void leveldb_writebatch_destroy(leveldb_writebatch_t* b) {
+void leveldb_writebatch_destroy(leveldb_writebatch_t* b) { delete b; }
-  delete b;
-}
 
-void leveldb_writebatch_clear(leveldb_writebatch_t* b) {
+void leveldb_writebatch_clear(leveldb_writebatch_t* b) { b->rep.Clear(); }
-  b->rep.Clear();
-}
 
-void leveldb_writebatch_put(
+void leveldb_writebatch_put(leveldb_writebatch_t* b, const char* key,
-    leveldb_writebatch_t* b,
+                            size_t klen, const char* val, size_t vlen) {
-    const char* key, size_t klen,
-    const char* val, size_t vlen) {
   b->rep.Put(Slice(key, klen), Slice(val, vlen));
 }
 
-void leveldb_writebatch_delete(
+void leveldb_writebatch_delete(leveldb_writebatch_t* b, const char* key,
-    leveldb_writebatch_t* b,
+                               size_t klen) {
-    const char* key, size_t klen) {
   b->rep.Delete(Slice(key, klen));
 }
 
-void leveldb_writebatch_iterate(
+void leveldb_writebatch_iterate(const leveldb_writebatch_t* b, void* state,
-    leveldb_writebatch_t* b,
+                                void (*put)(void*, const char* k, size_t klen,
-    void* state,
+                                            const char* v, size_t vlen),
-    void (*put)(void*, const char* k, size_t klen, const char* v, size_t vlen),
+                                void (*deleted)(void*, const char* k,
-    void (*deleted)(void*, const char* k, size_t klen)) {
+                                                size_t klen)) {
   class H : public WriteBatch::Handler {
    public:
     void* state_;
     void (*put_)(void*, const char* k, size_t klen, const char* v, size_t vlen);
     void (*deleted_)(void*, const char* k, size_t klen);
-    virtual void Put(const Slice& key, const Slice& value) {
+    void Put(const Slice& key, const Slice& value) override {
       (*put_)(state_, key.data(), key.size(), value.data(), value.size());
     }
-    virtual void Delete(const Slice& key) {
+    void Delete(const Slice& key) override {
       (*deleted_)(state_, key.data(), key.size());
     }
   };
@@ -385,47 +360,43 @@ void leveldb_writebatch_iterate(
   b->rep.Iterate(&handler);
 }
 
-leveldb_options_t* leveldb_options_create() {
+void leveldb_writebatch_append(leveldb_writebatch_t* destination,
-  return new leveldb_options_t;
+                               const leveldb_writebatch_t* source) {
+  destination->rep.Append(source->rep);
 }
 
-void leveldb_options_destroy(leveldb_options_t* options) {
+leveldb_options_t* leveldb_options_create() { return new leveldb_options_t; }
-  delete options;
-}
 
-void leveldb_options_set_comparator(
+void leveldb_options_destroy(leveldb_options_t* options) { delete options; }
-    leveldb_options_t* opt,
+
+void leveldb_options_set_comparator(leveldb_options_t* opt,
                                     leveldb_comparator_t* cmp) {
   opt->rep.comparator = cmp;
 }
 
-void leveldb_options_set_filter_policy(
+void leveldb_options_set_filter_policy(leveldb_options_t* opt,
-    leveldb_options_t* opt,
                                        leveldb_filterpolicy_t* policy) {
   opt->rep.filter_policy = policy;
 }
 
-void leveldb_options_set_create_if_missing(
+void leveldb_options_set_create_if_missing(leveldb_options_t* opt, uint8_t v) {
-    leveldb_options_t* opt, unsigned char v) {
   opt->rep.create_if_missing = v;
 }
 
-void leveldb_options_set_error_if_exists(
+void leveldb_options_set_error_if_exists(leveldb_options_t* opt, uint8_t v) {
-    leveldb_options_t* opt, unsigned char v) {
   opt->rep.error_if_exists = v;
 }
 
-void leveldb_options_set_paranoid_checks(
+void leveldb_options_set_paranoid_checks(leveldb_options_t* opt, uint8_t v) {
-    leveldb_options_t* opt, unsigned char v) {
   opt->rep.paranoid_checks = v;
 }
 
 void leveldb_options_set_env(leveldb_options_t* opt, leveldb_env_t* env) {
-  opt->rep.env = (env ? env->rep : NULL);
+  opt->rep.env = (env ? env->rep : nullptr);
 }
 
 void leveldb_options_set_info_log(leveldb_options_t* opt, leveldb_logger_t* l) {
-  opt->rep.info_log = (l ? l->rep : NULL);
+  opt->rep.info_log = (l ? l->rep : nullptr);
 }
 
 void leveldb_options_set_write_buffer_size(leveldb_options_t* opt, size_t s) {
@@ -448,17 +419,18 @@ void leveldb_options_set_block_restart_interval(leveldb_options_t* opt, int n) {
   opt->rep.block_restart_interval = n;
 }
 
+void leveldb_options_set_max_file_size(leveldb_options_t* opt, size_t s) {
+  opt->rep.max_file_size = s;
+}
+
 void leveldb_options_set_compression(leveldb_options_t* opt, int t) {
   opt->rep.compression = static_cast<CompressionType>(t);
 }
 
 leveldb_comparator_t* leveldb_comparator_create(
-    void* state,
+    void* state, void (*destructor)(void*),
-    void (*destructor)(void*),
+    int (*compare)(void*, const char* a, size_t alen, const char* b,
-    int (*compare)(
+                   size_t blen),
-        void*,
-        const char* a, size_t alen,
-        const char* b, size_t blen),
     const char* (*name)(void*)) {
   leveldb_comparator_t* result = new leveldb_comparator_t;
   result->state_ = state;
@@ -468,21 +440,14 @@ leveldb_comparator_t* leveldb_comparator_create(
   return result;
 }
 
-void leveldb_comparator_destroy(leveldb_comparator_t* cmp) {
+void leveldb_comparator_destroy(leveldb_comparator_t* cmp) { delete cmp; }
-  delete cmp;
-}
 
 leveldb_filterpolicy_t* leveldb_filterpolicy_create(
-    void* state,
+    void* state, void (*destructor)(void*),
-    void (*destructor)(void*),
+    char* (*create_filter)(void*, const char* const* key_array,
-    char* (*create_filter)(
+                           const size_t* key_length_array, int num_keys,
-        void*,
-        const char* const* key_array, const size_t* key_length_array,
-        int num_keys,
                            size_t* filter_length),
-    unsigned char (*key_may_match)(
+    uint8_t (*key_may_match)(void*, const char* key, size_t length,
-        void*,
-        const char* key, size_t length,
                              const char* filter, size_t filter_length),
     const char* (*name)(void*)) {
   leveldb_filterpolicy_t* result = new leveldb_filterpolicy_t;
@@ -503,7 +468,8 @@ leveldb_filterpolicy_t* leveldb_filterpolicy_create_bloom(int bits_per_key) {
   // they delegate to a NewBloomFilterPolicy() instead of user
   // supplied C functions.
   struct Wrapper : public leveldb_filterpolicy_t {
-    const FilterPolicy* rep_;
+    static void DoNothing(void*) {}
+
     ~Wrapper() { delete rep_; }
     const char* Name() const { return rep_->Name(); }
     void CreateFilter(const Slice* keys, int n, std::string* dst) const {
@@ -512,11 +478,12 @@ leveldb_filterpolicy_t* leveldb_filterpolicy_create_bloom(int bits_per_key) {
     bool KeyMayMatch(const Slice& key, const Slice& filter) const {
       return rep_->KeyMayMatch(key, filter);
     }
-    static void DoNothing(void*) { }
+
+    const FilterPolicy* rep_;
   };
   Wrapper* wrapper = new Wrapper;
   wrapper->rep_ = NewBloomFilterPolicy(bits_per_key);
-  wrapper->state_ = NULL;
+  wrapper->state_ = nullptr;
   wrapper->destructor_ = &Wrapper::DoNothing;
   return wrapper;
 }
@@ -525,37 +492,29 @@ leveldb_readoptions_t* leveldb_readoptions_create() {
   return new leveldb_readoptions_t;
 }
 
-void leveldb_readoptions_destroy(leveldb_readoptions_t* opt) {
+void leveldb_readoptions_destroy(leveldb_readoptions_t* opt) { delete opt; }
-  delete opt;
-}
 
-void leveldb_readoptions_set_verify_checksums(
+void leveldb_readoptions_set_verify_checksums(leveldb_readoptions_t* opt,
-    leveldb_readoptions_t* opt,
+                                              uint8_t v) {
-    unsigned char v) {
   opt->rep.verify_checksums = v;
 }
 
-void leveldb_readoptions_set_fill_cache(
+void leveldb_readoptions_set_fill_cache(leveldb_readoptions_t* opt, uint8_t v) {
-    leveldb_readoptions_t* opt, unsigned char v) {
   opt->rep.fill_cache = v;
 }
 
-void leveldb_readoptions_set_snapshot(
+void leveldb_readoptions_set_snapshot(leveldb_readoptions_t* opt,
-    leveldb_readoptions_t* opt,
                                       const leveldb_snapshot_t* snap) {
-  opt->rep.snapshot = (snap ? snap->rep : NULL);
+  opt->rep.snapshot = (snap ? snap->rep : nullptr);
 }
 
 leveldb_writeoptions_t* leveldb_writeoptions_create() {
   return new leveldb_writeoptions_t;
 }
 
-void leveldb_writeoptions_destroy(leveldb_writeoptions_t* opt) {
+void leveldb_writeoptions_destroy(leveldb_writeoptions_t* opt) { delete opt; }
-  delete opt;
-}
 
-void leveldb_writeoptions_set_sync(
+void leveldb_writeoptions_set_sync(leveldb_writeoptions_t* opt, uint8_t v) {
-    leveldb_writeoptions_t* opt, unsigned char v) {
   opt->rep.sync = v;
 }
 
@@ -582,16 +541,22 @@ void leveldb_env_destroy(leveldb_env_t* env) {
   delete env;
 }
 
-void leveldb_free(void* ptr) {
+char* leveldb_env_get_test_directory(leveldb_env_t* env) {
-  free(ptr);
+  std::string result;
+  if (!env->rep->GetTestDirectory(&result).ok()) {
+    return nullptr;
+  }
+
+  char* buffer = static_cast<char*>(malloc(result.size() + 1));
+  memcpy(buffer, result.data(), result.size());
+  buffer[result.size()] = '\0';
+  return buffer;
 }
 
-int leveldb_major_version() {
+void leveldb_free(void* ptr) { free(ptr); }
-  return kMajorVersion;
-}
 
-int leveldb_minor_version() {
+int leveldb_major_version() { return kMajorVersion; }
-  return kMinorVersion;
+
-}
+int leveldb_minor_version() { return kMinorVersion; }
 
 }  // end extern "C"

db/c_test.c

@@ -8,24 +8,14 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <sys/types.h>
-#include <unistd.h>
 
 const char* phase = "";
-static char dbname[200];
 
 static void StartPhase(const char* name) {
   fprintf(stderr, "=== Test %s\n", name);
   phase = name;
 }
 
-static const char* GetTempDir(void) {
-    const char* ret = getenv("TEST_TMPDIR");
-    if (ret == NULL || ret[0] == '\0')
-        ret = "/tmp";
-    return ret;
-}
-
 #define CheckNoError(err)                                               \
   if ((err) != NULL) {                                                  \
     fprintf(stderr, "%s:%d: %s: %s\n", __FILE__, __LINE__, phase, (err)); \
@@ -130,7 +120,7 @@ static const char* CmpName(void* arg) {
 }
 
 // Custom filter policy
-static unsigned char fake_filter_result = 1;
+static uint8_t fake_filter_result = 1;
 static void FilterDestroy(void* arg) { }
 static const char* FilterName(void* arg) {
   return "TestFilter";
@@ -145,9 +135,7 @@ static char* FilterCreate(
   memcpy(result, "fake", 4);
   return result;
 }
-unsigned char FilterKeyMatch(
+uint8_t FilterKeyMatch(void* arg, const char* key, size_t length,
-    void* arg,
-    const char* key, size_t length,
                        const char* filter, size_t filter_length) {
   CheckCondition(filter_length == 4);
   CheckCondition(memcmp(filter, "fake", 4) == 0);
@@ -162,21 +150,19 @@ int main(int argc, char** argv) {
   leveldb_options_t* options;
   leveldb_readoptions_t* roptions;
   leveldb_writeoptions_t* woptions;
+  char* dbname;
   char* err = NULL;
   int run = -1;
 
   CheckCondition(leveldb_major_version() >= 1);
   CheckCondition(leveldb_minor_version() >= 1);
 
-  snprintf(dbname, sizeof(dbname),
-           "%s/leveldb_c_test-%d",
-           GetTempDir(),
-           ((int) geteuid()));
-
   StartPhase("create_objects");
   cmp = leveldb_comparator_create(NULL, CmpDestroy, CmpCompare, CmpName);
   env = leveldb_create_default_env();
   cache = leveldb_cache_create_lru(100000);
+  dbname = leveldb_env_get_test_directory(env);
+  CheckCondition(dbname != NULL);
 
   options = leveldb_options_create();
   leveldb_options_set_comparator(options, cmp);
@@ -189,6 +175,7 @@ int main(int argc, char** argv) {
   leveldb_options_set_max_open_files(options, 10);
   leveldb_options_set_block_size(options, 1024);
   leveldb_options_set_block_restart_interval(options, 8);
+  leveldb_options_set_max_file_size(options, 3 << 20);
   leveldb_options_set_compression(options, leveldb_no_compression);
 
   roptions = leveldb_readoptions_create();
@@ -239,12 +226,18 @@ int main(int argc, char** argv) {
     leveldb_writebatch_clear(wb);
     leveldb_writebatch_put(wb, "bar", 3, "b", 1);
     leveldb_writebatch_put(wb, "box", 3, "c", 1);
-    leveldb_writebatch_delete(wb, "bar", 3);
+
+    leveldb_writebatch_t* wb2 = leveldb_writebatch_create();
+    leveldb_writebatch_delete(wb2, "bar", 3);
+    leveldb_writebatch_append(wb, wb2);
+    leveldb_writebatch_destroy(wb2);
+
     leveldb_write(db, woptions, wb, &err);
     CheckNoError(err);
     CheckGet(db, roptions, "foo", "hello");
     CheckGet(db, roptions, "bar", NULL);
     CheckGet(db, roptions, "box", "c");
+
     int pos = 0;
     leveldb_writebatch_iterate(wb, &pos, CheckPut, CheckDel);
     CheckCondition(pos == 3);
@@ -381,6 +374,7 @@ int main(int argc, char** argv) {
   leveldb_options_destroy(options);
   leveldb_readoptions_destroy(roptions);
   leveldb_writeoptions_destroy(woptions);
+  leveldb_free(dbname);
   leveldb_cache_destroy(cache);
   leveldb_comparator_destroy(cmp);
   leveldb_env_destroy(env);

db/corruption_test.cc

@@ -2,20 +2,16 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 
-#include "leveldb/db.h"
-
-#include <errno.h>
-#include <fcntl.h>
-#include <sys/stat.h>
 #include <sys/types.h>
-#include "leveldb/cache.h"
+
-#include "leveldb/env.h"
-#include "leveldb/table.h"
-#include "leveldb/write_batch.h"
 #include "db/db_impl.h"
 #include "db/filename.h"
 #include "db/log_format.h"
 #include "db/version_set.h"
+#include "leveldb/cache.h"
+#include "leveldb/db.h"
+#include "leveldb/table.h"
+#include "leveldb/write_batch.h"
 #include "util/logging.h"
 #include "util/testharness.h"
 #include "util/testutil.h"
@@ -26,20 +22,14 @@ static const int kValueSize = 1000;
 
 class CorruptionTest {
  public:
-  test::ErrorEnv env_;
+  CorruptionTest()
-  std::string dbname_;
+      : db_(nullptr),
-  Cache* tiny_cache_;
+        dbname_("/memenv/corruption_test"),
-  Options options_;
+        tiny_cache_(NewLRUCache(100)) {
-  DB* db_;
-
-  CorruptionTest() {
-    tiny_cache_ = NewLRUCache(100);
     options_.env = &env_;
     options_.block_cache = tiny_cache_;
-    dbname_ = test::TmpDir() + "/corruption_test";
     DestroyDB(dbname_, options_);
 
-    db_ = NULL;
     options_.create_if_missing = true;
     Reopen();
     options_.create_if_missing = false;
@@ -47,23 +37,20 @@ class CorruptionTest {
 
   ~CorruptionTest() {
     delete db_;
-     DestroyDB(dbname_, Options());
     delete tiny_cache_;
   }
 
   Status TryReopen() {
     delete db_;
-    db_ = NULL;
+    db_ = nullptr;
     return DB::Open(options_, dbname_, &db_);
   }
 
-  void Reopen() {
+  void Reopen() { ASSERT_OK(TryReopen()); }
-    ASSERT_OK(TryReopen());
-  }
 
   void RepairDB() {
     delete db_;
-    db_ = NULL;
+    db_ = nullptr;
     ASSERT_OK(::leveldb::RepairDB(dbname_, options_));
   }
 
@@ -71,7 +58,7 @@ class CorruptionTest {
     std::string key_space, value_space;
     WriteBatch batch;
     for (int i = 0; i < n; i++) {
-      //if ((i % 100) == 0) fprintf(stderr, "@ %d of %d\n", i, n);
+      // if ((i % 100) == 0) fprintf(stderr, "@ %d of %d\n", i, n);
       Slice key = Key(i, &key_space);
       batch.Clear();
       batch.Put(key, Value(i, &value_space));
@@ -100,8 +87,7 @@ class CorruptionTest {
         // Ignore boundary keys.
         continue;
       }
-      if (!ConsumeDecimalNumber(&in, &key) ||
+      if (!ConsumeDecimalNumber(&in, &key) || !in.empty() ||
-          !in.empty() ||
           key < next_expected) {
         bad_keys++;
         continue;
@@ -126,14 +112,13 @@ class CorruptionTest {
   void Corrupt(FileType filetype, int offset, int bytes_to_corrupt) {
     // Pick file to corrupt
     std::vector<std::string> filenames;
-    ASSERT_OK(env_.GetChildren(dbname_, &filenames));
+    ASSERT_OK(env_.target()->GetChildren(dbname_, &filenames));
     uint64_t number;
     FileType type;
     std::string fname;
     int picked_number = -1;
     for (size_t i = 0; i < filenames.size(); i++) {
-      if (ParseFileName(filenames[i], &number, &type) &&
+      if (ParseFileName(filenames[i], &number, &type) && type == filetype &&
-          type == filetype &&
           int(number) > picked_number) {  // Pick latest file
         fname = dbname_ + "/" + filenames[i];
         picked_number = number;
@@ -141,35 +126,32 @@ class CorruptionTest {
     }
     ASSERT_TRUE(!fname.empty()) << filetype;
 
-    struct stat sbuf;
+    uint64_t file_size;
-    if (stat(fname.c_str(), &sbuf) != 0) {
+    ASSERT_OK(env_.target()->GetFileSize(fname, &file_size));
-      const char* msg = strerror(errno);
-      ASSERT_TRUE(false) << fname << ": " << msg;
-    }
 
     if (offset < 0) {
       // Relative to end of file; make it absolute
-      if (-offset > sbuf.st_size) {
+      if (-offset > file_size) {
         offset = 0;
       } else {
-        offset = sbuf.st_size + offset;
+        offset = file_size + offset;
       }
     }
-    if (offset > sbuf.st_size) {
+    if (offset > file_size) {
-      offset = sbuf.st_size;
+      offset = file_size;
     }
-    if (offset + bytes_to_corrupt > sbuf.st_size) {
+    if (offset + bytes_to_corrupt > file_size) {
-      bytes_to_corrupt = sbuf.st_size - offset;
+      bytes_to_corrupt = file_size - offset;
     }
 
     // Do it
     std::string contents;
-    Status s = ReadFileToString(Env::Default(), fname, &contents);
+    Status s = ReadFileToString(env_.target(), fname, &contents);
     ASSERT_TRUE(s.ok()) << s.ToString();
     for (int i = 0; i < bytes_to_corrupt; i++) {
       contents[i + offset] ^= 0x80;
     }
-    s = WriteStringToFile(Env::Default(), contents, fname);
+    s = WriteStringToFile(env_.target(), contents, fname);
     ASSERT_TRUE(s.ok()) << s.ToString();
   }
 
@@ -197,6 +179,14 @@ class CorruptionTest {
     Random r(k);
     return test::RandomString(&r, kValueSize, storage);
   }
+
+  test::ErrorEnv env_;
+  Options options_;
+  DB* db_;
+
+ private:
+  std::string dbname_;
+  Cache* tiny_cache_;
 };
 
 TEST(CorruptionTest, Recovery) {
@@ -237,8 +227,8 @@ TEST(CorruptionTest, TableFile) {
   Build(100);
   DBImpl* dbi = reinterpret_cast<DBImpl*>(db_);
   dbi->TEST_CompactMemTable();
-  dbi->TEST_CompactRange(0, NULL, NULL);
+  dbi->TEST_CompactRange(0, nullptr, nullptr);
-  dbi->TEST_CompactRange(1, NULL, NULL);
+  dbi->TEST_CompactRange(1, nullptr, nullptr);
 
   Corrupt(kTableFile, 100, 1);
   Check(90, 99);
@@ -251,8 +241,8 @@ TEST(CorruptionTest, TableFileRepair) {
   Build(100);
   DBImpl* dbi = reinterpret_cast<DBImpl*>(db_);
   dbi->TEST_CompactMemTable();
-  dbi->TEST_CompactRange(0, NULL, NULL);
+  dbi->TEST_CompactRange(0, nullptr, nullptr);
-  dbi->TEST_CompactRange(1, NULL, NULL);
+  dbi->TEST_CompactRange(1, nullptr, nullptr);
 
   Corrupt(kTableFile, 100, 1);
   RepairDB();
@@ -302,7 +292,7 @@ TEST(CorruptionTest, CorruptedDescriptor) {
   ASSERT_OK(db_->Put(WriteOptions(), "foo", "hello"));
   DBImpl* dbi = reinterpret_cast<DBImpl*>(db_);
   dbi->TEST_CompactMemTable();
-  dbi->TEST_CompactRange(0, NULL, NULL);
+  dbi->TEST_CompactRange(0, nullptr, nullptr);
 
   Corrupt(kDescriptorFile, 0, 1000);
   Status s = TryReopen();
@@ -343,7 +333,7 @@ TEST(CorruptionTest, CompactionInputErrorParanoid) {
     Corrupt(kTableFile, 100, 1);
     env_.SleepForMicroseconds(100000);
   }
-  dbi->CompactRange(NULL, NULL);
+  dbi->CompactRange(nullptr, nullptr);
 
   // Write must fail because of corrupted table
   std::string tmp1, tmp2;
@@ -369,6 +359,4 @@ TEST(CorruptionTest, UnrelatedKeys) {
 
 }  // namespace leveldb
 
-int main(int argc, char** argv) {
+int main(int argc, char** argv) { return leveldb::test::RunAllTests(); }
-  return leveldb::test::RunAllTests();
-}

db/db_impl.h

@@ -5,8 +5,11 @@
 #ifndef STORAGE_LEVELDB_DB_DB_IMPL_H_
 #define STORAGE_LEVELDB_DB_DB_IMPL_H_
 
+#include <atomic>
 #include <deque>
 #include <set>
+#include <string>
+
 #include "db/dbformat.h"
 #include "db/log_writer.h"
 #include "db/snapshot.h"
@@ -26,21 +29,25 @@ class VersionSet;
 class DBImpl : public DB {
  public:
   DBImpl(const Options& options, const std::string& dbname);
-  virtual ~DBImpl();
+
+  DBImpl(const DBImpl&) = delete;
+  DBImpl& operator=(const DBImpl&) = delete;
+
+  ~DBImpl() override;
 
   // Implementations of the DB interface
-  virtual Status Put(const WriteOptions&, const Slice& key, const Slice& value);
+  Status Put(const WriteOptions&, const Slice& key,
-  virtual Status Delete(const WriteOptions&, const Slice& key);
+             const Slice& value) override;
-  virtual Status Write(const WriteOptions& options, WriteBatch* updates);
+  Status Delete(const WriteOptions&, const Slice& key) override;
-  virtual Status Get(const ReadOptions& options,
+  Status Write(const WriteOptions& options, WriteBatch* updates) override;
-                     const Slice& key,
+  Status Get(const ReadOptions& options, const Slice& key,
-                     std::string* value);
+             std::string* value) override;
-  virtual Iterator* NewIterator(const ReadOptions&);
+  Iterator* NewIterator(const ReadOptions&) override;
-  virtual const Snapshot* GetSnapshot();
+  const Snapshot* GetSnapshot() override;
-  virtual void ReleaseSnapshot(const Snapshot* snapshot);
+  void ReleaseSnapshot(const Snapshot* snapshot) override;
-  virtual bool GetProperty(const Slice& property, std::string* value);
+  bool GetProperty(const Slice& property, std::string* value) override;
-  virtual void GetApproximateSizes(const Range* range, int n, uint64_t* sizes);
+  void GetApproximateSizes(const Range* range, int n, uint64_t* sizes) override;
-  virtual void CompactRange(const Slice* begin, const Slice* end);
+  void CompactRange(const Slice* begin, const Slice* end) override;
 
   // Extra methods (for testing) that are not in the public DB interface
 
@@ -69,6 +76,31 @@ class DBImpl : public DB {
   struct CompactionState;
   struct Writer;
 
+  // Information for a manual compaction
+  struct ManualCompaction {
+    int level;
+    bool done;
+    const InternalKey* begin;  // null means beginning of key range
+    const InternalKey* end;    // null means end of key range
+    InternalKey tmp_storage;   // Used to keep track of compaction progress
+  };
+
+  // Per level compaction stats.  stats_[level] stores the stats for
+  // compactions that produced data for the specified "level".
+  struct CompactionStats {
+    CompactionStats() : micros(0), bytes_read(0), bytes_written(0) {}
+
+    void Add(const CompactionStats& c) {
+      this->micros += c.micros;
+      this->bytes_read += c.bytes_read;
+      this->bytes_written += c.bytes_written;
+    }
+
+    int64_t micros;
+    int64_t bytes_read;
+    int64_t bytes_written;
+  };
+
   Iterator* NewInternalIterator(const ReadOptions&,
                                 SequenceNumber* latest_snapshot,
                                 uint32_t* seed);
@@ -84,7 +116,7 @@ class DBImpl : public DB {
   void MaybeIgnoreError(Status* s) const;
 
   // Delete any unneeded files and stale in-memory entries.
-  void DeleteObsoleteFiles();
+  void DeleteObsoleteFiles() EXCLUSIVE_LOCKS_REQUIRED(mutex_);
 
   // Compact the in-memory write buffer to disk.  Switches to a new
   // log-file/memtable and writes a new descriptor iff successful.
@@ -100,7 +132,8 @@ class DBImpl : public DB {
 
   Status MakeRoomForWrite(bool force /* compact even if there is room? */)
       EXCLUSIVE_LOCKS_REQUIRED(mutex_);
-  WriteBatch* BuildBatchGroup(Writer** last_writer);
+  WriteBatch* BuildBatchGroup(Writer** last_writer)
+      EXCLUSIVE_LOCKS_REQUIRED(mutex_);
 
   void RecordBackgroundError(const Status& s);
 
@@ -118,90 +151,63 @@ class DBImpl : public DB {
   Status InstallCompactionResults(CompactionState* compact)
       EXCLUSIVE_LOCKS_REQUIRED(mutex_);
 
+  const Comparator* user_comparator() const {
+    return internal_comparator_.user_comparator();
+  }
+
   // Constant after construction
   Env* const env_;
   const InternalKeyComparator internal_comparator_;
   const InternalFilterPolicy internal_filter_policy_;
   const Options options_;  // options_.comparator == &internal_comparator_
-  bool owns_info_log_;
+  const bool owns_info_log_;
-  bool owns_cache_;
+  const bool owns_cache_;
   const std::string dbname_;
 
   // table_cache_ provides its own synchronization
-  TableCache* table_cache_;
+  TableCache* const table_cache_;
 
-  // Lock over the persistent DB state.  Non-NULL iff successfully acquired.
+  // Lock over the persistent DB state.  Non-null iff successfully acquired.
   FileLock* db_lock_;
 
   // State below is protected by mutex_
   port::Mutex mutex_;
-  port::AtomicPointer shutting_down_;
+  std::atomic<bool> shutting_down_;
-  port::CondVar bg_cv_;          // Signalled when background work finishes
+  port::CondVar background_work_finished_signal_ GUARDED_BY(mutex_);
   MemTable* mem_;
-  MemTable* imm_;                // Memtable being compacted
+  MemTable* imm_ GUARDED_BY(mutex_);  // Memtable being compacted
-  port::AtomicPointer has_imm_;  // So bg thread can detect non-NULL imm_
+  std::atomic<bool> has_imm_;         // So bg thread can detect non-null imm_
   WritableFile* logfile_;
-  uint64_t logfile_number_;
+  uint64_t logfile_number_ GUARDED_BY(mutex_);
   log::Writer* log_;
-  uint32_t seed_;                // For sampling.
+  uint32_t seed_ GUARDED_BY(mutex_);  // For sampling.
 
   // Queue of writers.
-  std::deque<Writer*> writers_;
+  std::deque<Writer*> writers_ GUARDED_BY(mutex_);
-  WriteBatch* tmp_batch_;
+  WriteBatch* tmp_batch_ GUARDED_BY(mutex_);
 
-  SnapshotList snapshots_;
+  SnapshotList snapshots_ GUARDED_BY(mutex_);
 
   // Set of table files to protect from deletion because they are
   // part of ongoing compactions.
-  std::set<uint64_t> pending_outputs_;
+  std::set<uint64_t> pending_outputs_ GUARDED_BY(mutex_);
 
   // Has a background compaction been scheduled or is running?
-  bool bg_compaction_scheduled_;
+  bool background_compaction_scheduled_ GUARDED_BY(mutex_);
 
-  // Information for a manual compaction
+  ManualCompaction* manual_compaction_ GUARDED_BY(mutex_);
-  struct ManualCompaction {
-    int level;
-    bool done;
-    const InternalKey* begin;   // NULL means beginning of key range
-    const InternalKey* end;     // NULL means end of key range
-    InternalKey tmp_storage;    // Used to keep track of compaction progress
-  };
-  ManualCompaction* manual_compaction_;
 
-  VersionSet* versions_;
+  VersionSet* const versions_ GUARDED_BY(mutex_);
 
   // Have we encountered a background error in paranoid mode?
-  Status bg_error_;
+  Status bg_error_ GUARDED_BY(mutex_);
 
-  // Per level compaction stats.  stats_[level] stores the stats for
+  CompactionStats stats_[config::kNumLevels] GUARDED_BY(mutex_);
-  // compactions that produced data for the specified "level".
-  struct CompactionStats {
-    int64_t micros;
-    int64_t bytes_read;
-    int64_t bytes_written;
-
-    CompactionStats() : micros(0), bytes_read(0), bytes_written(0) { }
-
-    void Add(const CompactionStats& c) {
-      this->micros += c.micros;
-      this->bytes_read += c.bytes_read;
-      this->bytes_written += c.bytes_written;
-    }
-  };
-  CompactionStats stats_[config::kNumLevels];
-
-  // No copying allowed
-  DBImpl(const DBImpl&);
-  void operator=(const DBImpl&);
-
-  const Comparator* user_comparator() const {
-    return internal_comparator_.user_comparator();
-  }
 };
 
 // Sanitize db options.  The caller should delete result.info_log if
 // it is not equal to src.info_log.
-extern Options SanitizeOptions(const std::string& db,
+Options SanitizeOptions(const std::string& db,
                         const InternalKeyComparator* icmp,
                         const InternalFilterPolicy* ipolicy,
                         const Options& src);

db/db_iter.cc

@@ -4,9 +4,9 @@
 
 #include "db/db_iter.h"
 
-#include "db/filename.h"
 #include "db/db_impl.h"
 #include "db/dbformat.h"
+#include "db/filename.h"
 #include "leveldb/env.h"
 #include "leveldb/iterator.h"
 #include "port/port.h"
@@ -36,17 +36,14 @@ namespace {
 // combines multiple entries for the same userkey found in the DB
 // representation into a single entry while accounting for sequence
 // numbers, deletion markers, overwrites, etc.
-class DBIter: public Iterator {
+class DBIter : public Iterator {
  public:
   // Which direction is the iterator currently moving?
   // (1) When moving forward, the internal iterator is positioned at
   //     the exact entry that yields this->key(), this->value()
   // (2) When moving backwards, the internal iterator is positioned
   //     just before all entries whose user key == this->key().
-  enum Direction {
+  enum Direction { kForward, kReverse };
-    kForward,
-    kReverse
-  };
 
   DBIter(DBImpl* db, const Comparator* cmp, Iterator* iter, SequenceNumber s,
          uint32_t seed)
@@ -57,21 +54,22 @@ class DBIter: public Iterator {
         direction_(kForward),
         valid_(false),
         rnd_(seed),
-        bytes_counter_(RandomPeriod()) {
+        bytes_until_read_sampling_(RandomCompactionPeriod()) {}
-  }
+
-  virtual ~DBIter() {
+  DBIter(const DBIter&) = delete;
-    delete iter_;
+  DBIter& operator=(const DBIter&) = delete;
-  }
+
-  virtual bool Valid() const { return valid_; }
+  ~DBIter() override { delete iter_; }
-  virtual Slice key() const {
+  bool Valid() const override { return valid_; }
+  Slice key() const override {
     assert(valid_);
     return (direction_ == kForward) ? ExtractUserKey(iter_->key()) : saved_key_;
   }
-  virtual Slice value() const {
+  Slice value() const override {
     assert(valid_);
     return (direction_ == kForward) ? iter_->value() : saved_value_;
   }
-  virtual Status status() const {
+  Status status() const override {
     if (status_.ok()) {
       return iter_->status();
     } else {
@@ -79,11 +77,11 @@ class DBIter: public Iterator {
     }
   }
 
-  virtual void Next();
+  void Next() override;
-  virtual void Prev();
+  void Prev() override;
-  virtual void Seek(const Slice& target);
+  void Seek(const Slice& target) override;
-  virtual void SeekToFirst();
+  void SeekToFirst() override;
-  virtual void SeekToLast();
+  void SeekToLast() override;
 
  private:
   void FindNextUserEntry(bool skipping, std::string* skip);
@@ -103,38 +101,35 @@ class DBIter: public Iterator {
     }
   }
 
-  // Pick next gap with average value of config::kReadBytesPeriod.
+  // Picks the number of bytes that can be read until a compaction is scheduled.
-  ssize_t RandomPeriod() {
+  size_t RandomCompactionPeriod() {
-    return rnd_.Uniform(2*config::kReadBytesPeriod);
+    return rnd_.Uniform(2 * config::kReadBytesPeriod);
   }
 
   DBImpl* db_;
   const Comparator* const user_comparator_;
   Iterator* const iter_;
   SequenceNumber const sequence_;
-
   Status status_;
   std::string saved_key_;    // == current key when direction_==kReverse
   std::string saved_value_;  // == current raw value when direction_==kReverse
   Direction direction_;
   bool valid_;
-
   Random rnd_;
-  ssize_t bytes_counter_;
+  size_t bytes_until_read_sampling_;
-
-  // No copying allowed
-  DBIter(const DBIter&);
-  void operator=(const DBIter&);
 };
 
 inline bool DBIter::ParseKey(ParsedInternalKey* ikey) {
   Slice k = iter_->key();
-  ssize_t n = k.size() + iter_->value().size();
+
-  bytes_counter_ -= n;
+  size_t bytes_read = k.size() + iter_->value().size();
-  while (bytes_counter_ < 0) {
+  while (bytes_until_read_sampling_ < bytes_read) {
-    bytes_counter_ += RandomPeriod();
+    bytes_until_read_sampling_ += RandomCompactionPeriod();
     db_->RecordReadSample(k);
   }
+  assert(bytes_until_read_sampling_ >= bytes_read);
+  bytes_until_read_sampling_ -= bytes_read;
+
   if (!ParseInternalKey(k, ikey)) {
     status_ = Status::Corruption("corrupted internal key in DBIter");
     return false;
@@ -165,6 +160,15 @@ void DBIter::Next() {
   } else {
     // Store in saved_key_ the current key so we skip it below.
     SaveKey(ExtractUserKey(iter_->key()), &saved_key_);
+
+    // iter_ is pointing to current key. We can now safely move to the next to
+    // avoid checking current key.
+    iter_->Next();
+    if (!iter_->Valid()) {
+      valid_ = false;
+      saved_key_.clear();
+      return;
+    }
   }
 
   FindNextUserEntry(true, &saved_key_);
@@ -218,8 +222,8 @@ void DBIter::Prev() {
         ClearSavedValue();
         return;
       }
-      if (user_comparator_->Compare(ExtractUserKey(iter_->key()),
+      if (user_comparator_->Compare(ExtractUserKey(iter_->key()), saved_key_) <
-                                    saved_key_) < 0) {
+          0) {
         break;
       }
     }
@@ -275,8 +279,8 @@ void DBIter::Seek(const Slice& target) {
   direction_ = kForward;
   ClearSavedValue();
   saved_key_.clear();
-  AppendInternalKey(
+  AppendInternalKey(&saved_key_,
-      &saved_key_, ParsedInternalKey(target, sequence_, kValueTypeForSeek));
+                    ParsedInternalKey(target, sequence_, kValueTypeForSeek));
   iter_->Seek(saved_key_);
   if (iter_->Valid()) {
     FindNextUserEntry(false, &saved_key_ /* temporary storage */);
@@ -305,11 +309,8 @@ void DBIter::SeekToLast() {
 
 }  // anonymous namespace
 
-Iterator* NewDBIterator(
+Iterator* NewDBIterator(DBImpl* db, const Comparator* user_key_comparator,
-    DBImpl* db,
+                        Iterator* internal_iter, SequenceNumber sequence,
-    const Comparator* user_key_comparator,
-    Iterator* internal_iter,
-    SequenceNumber sequence,
                         uint32_t seed) {
   return new DBIter(db, user_key_comparator, internal_iter, sequence, seed);
 }

db/db_iter.h

@@ -6,8 +6,9 @@
 #define STORAGE_LEVELDB_DB_DB_ITER_H_
 
 #include <stdint.h>
-#include "leveldb/db.h"
+
 #include "db/dbformat.h"
+#include "leveldb/db.h"
 
 namespace leveldb {
 
@@ -16,11 +17,8 @@ class DBImpl;
 // Return a new iterator that converts internal keys (yielded by
 // "*internal_iter") that were live at the specified "sequence" number
 // into appropriate user keys.
-extern Iterator* NewDBIterator(
+Iterator* NewDBIterator(DBImpl* db, const Comparator* user_key_comparator,
-    DBImpl* db,
+                        Iterator* internal_iter, SequenceNumber sequence,
-    const Comparator* user_key_comparator,
-    Iterator* internal_iter,
-    SequenceNumber sequence,
                         uint32_t seed);
 
 }  // namespace leveldb

db/dbformat.cc

@@ -2,8 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 
-#include <stdio.h>
 #include "db/dbformat.h"
+
+#include <stdio.h>
+
+#include <sstream>
+
 #include "port/port.h"
 #include "util/coding.h"
 
@@ -21,26 +25,20 @@ void AppendInternalKey(std::string* result, const ParsedInternalKey& key) {
 }
 
 std::string ParsedInternalKey::DebugString() const {
-  char buf[50];
+  std::ostringstream ss;
-  snprintf(buf, sizeof(buf), "' @ %llu : %d",
+  ss << '\'' << EscapeString(user_key.ToString()) << "' @ " << sequence << " : "
-           (unsigned long long) sequence,
+     << static_cast<int>(type);
-           int(type));
+  return ss.str();
-  std::string result = "'";
-  result += EscapeString(user_key.ToString());
-  result += buf;
-  return result;
 }
 
 std::string InternalKey::DebugString() const {
-  std::string result;
   ParsedInternalKey parsed;
   if (ParseInternalKey(rep_, &parsed)) {
-    result = parsed.DebugString();
+    return parsed.DebugString();
-  } else {
-    result = "(bad)";
-    result.append(EscapeString(rep_));
   }
-  return result;
+  std::ostringstream ss;
+  ss << "(bad)" << EscapeString(rep_);
+  return ss.str();
 }
 
 const char* InternalKeyComparator::Name() const {
@@ -65,8 +63,7 @@ int InternalKeyComparator::Compare(const Slice& akey, const Slice& bkey) const {
   return r;
 }
 
-void InternalKeyComparator::FindShortestSeparator(
+void InternalKeyComparator::FindShortestSeparator(std::string* start,
-      std::string* start,
                                                   const Slice& limit) const {
   // Attempt to shorten the user portion of the key
   Slice user_start = ExtractUserKey(*start);
@@ -77,7 +74,8 @@ void InternalKeyComparator::FindShortestSeparator(
       user_comparator_->Compare(user_start, tmp) < 0) {
     // User key has become shorter physically, but larger logically.
     // Tack on the earliest possible number to the shortened user key.
-    PutFixed64(&tmp, PackSequenceAndType(kMaxSequenceNumber,kValueTypeForSeek));
+    PutFixed64(&tmp,
+               PackSequenceAndType(kMaxSequenceNumber, kValueTypeForSeek));
     assert(this->Compare(*start, tmp) < 0);
     assert(this->Compare(tmp, limit) < 0);
     start->swap(tmp);
@@ -92,15 +90,14 @@ void InternalKeyComparator::FindShortSuccessor(std::string* key) const {
       user_comparator_->Compare(user_key, tmp) < 0) {
     // User key has become shorter physically, but larger logically.
     // Tack on the earliest possible number to the shortened user key.
-    PutFixed64(&tmp, PackSequenceAndType(kMaxSequenceNumber,kValueTypeForSeek));
+    PutFixed64(&tmp,
+               PackSequenceAndType(kMaxSequenceNumber, kValueTypeForSeek));
     assert(this->Compare(*key, tmp) < 0);
     key->swap(tmp);
   }
 }
 
-const char* InternalFilterPolicy::Name() const {
+const char* InternalFilterPolicy::Name() const { return user_policy_->Name(); }
-  return user_policy_->Name();
-}
 
 void InternalFilterPolicy::CreateFilter(const Slice* keys, int n,
                                         std::string* dst) const {

db/dbformat.h

@@ -5,7 +5,10 @@
 #ifndef STORAGE_LEVELDB_DB_DBFORMAT_H_
 #define STORAGE_LEVELDB_DB_DBFORMAT_H_
 
-#include <stdio.h>
+#include <cstddef>
+#include <cstdint>
+#include <string>
+
 #include "leveldb/comparator.h"
 #include "leveldb/db.h"
 #include "leveldb/filter_policy.h"
@@ -48,10 +51,7 @@ class InternalKey;
 // Value types encoded as the last component of internal keys.
 // DO NOT CHANGE THESE ENUM VALUES: they are embedded in the on-disk
 // data structures.
-enum ValueType {
+enum ValueType { kTypeDeletion = 0x0, kTypeValue = 0x1 };
-  kTypeDeletion = 0x0,
-  kTypeValue = 0x1
-};
 // kValueTypeForSeek defines the ValueType that should be passed when
 // constructing a ParsedInternalKey object for seeking to a particular
 // sequence number (since we sort sequence numbers in decreasing order
@@ -64,17 +64,16 @@ typedef uint64_t SequenceNumber;
 
 // We leave eight bits empty at the bottom so a type and sequence#
 // can be packed together into 64-bits.
-static const SequenceNumber kMaxSequenceNumber =
+static const SequenceNumber kMaxSequenceNumber = ((0x1ull << 56) - 1);
-    ((0x1ull << 56) - 1);
 
 struct ParsedInternalKey {
   Slice user_key;
   SequenceNumber sequence;
   ValueType type;
 
-  ParsedInternalKey() { }  // Intentionally left uninitialized (for speed)
+  ParsedInternalKey() {}  // Intentionally left uninitialized (for speed)
   ParsedInternalKey(const Slice& u, const SequenceNumber& seq, ValueType t)
-      : user_key(u), sequence(seq), type(t) { }
+      : user_key(u), sequence(seq), type(t) {}
   std::string DebugString() const;
 };
 
@@ -84,15 +83,13 @@ inline size_t InternalKeyEncodingLength(const ParsedInternalKey& key) {
 }
 
 // Append the serialization of "key" to *result.
-extern void AppendInternalKey(std::string* result,
+void AppendInternalKey(std::string* result, const ParsedInternalKey& key);
-                              const ParsedInternalKey& key);
 
 // Attempt to parse an internal key from "internal_key".  On success,
 // stores the parsed data in "*result", and returns true.
 //
 // On error, returns false, leaves "*result" in an undefined state.
-extern bool ParseInternalKey(const Slice& internal_key,
+bool ParseInternalKey(const Slice& internal_key, ParsedInternalKey* result);
-                             ParsedInternalKey* result);
 
 // Returns the user key portion of an internal key.
 inline Slice ExtractUserKey(const Slice& internal_key) {
@@ -100,27 +97,19 @@ inline Slice ExtractUserKey(const Slice& internal_key) {
   return Slice(internal_key.data(), internal_key.size() - 8);
 }
 
-inline ValueType ExtractValueType(const Slice& internal_key) {
-  assert(internal_key.size() >= 8);
-  const size_t n = internal_key.size();
-  uint64_t num = DecodeFixed64(internal_key.data() + n - 8);
-  unsigned char c = num & 0xff;
-  return static_cast<ValueType>(c);
-}
-
 // A comparator for internal keys that uses a specified comparator for
 // the user key portion and breaks ties by decreasing sequence number.
 class InternalKeyComparator : public Comparator {
  private:
   const Comparator* user_comparator_;
+
  public:
-  explicit InternalKeyComparator(const Comparator* c) : user_comparator_(c) { }
+  explicit InternalKeyComparator(const Comparator* c) : user_comparator_(c) {}
-  virtual const char* Name() const;
+  const char* Name() const override;
-  virtual int Compare(const Slice& a, const Slice& b) const;
+  int Compare(const Slice& a, const Slice& b) const override;
-  virtual void FindShortestSeparator(
+  void FindShortestSeparator(std::string* start,
-      std::string* start,
+                             const Slice& limit) const override;
-      const Slice& limit) const;
+  void FindShortSuccessor(std::string* key) const override;
-  virtual void FindShortSuccessor(std::string* key) const;
 
   const Comparator* user_comparator() const { return user_comparator_; }
 
@@ -131,11 +120,12 @@ class InternalKeyComparator : public Comparator {
 class InternalFilterPolicy : public FilterPolicy {
  private:
   const FilterPolicy* const user_policy_;
+
  public:
-  explicit InternalFilterPolicy(const FilterPolicy* p) : user_policy_(p) { }
+  explicit InternalFilterPolicy(const FilterPolicy* p) : user_policy_(p) {}
-  virtual const char* Name() const;
+  const char* Name() const override;
-  virtual void CreateFilter(const Slice* keys, int n, std::string* dst) const;
+  void CreateFilter(const Slice* keys, int n, std::string* dst) const override;
-  virtual bool KeyMayMatch(const Slice& key, const Slice& filter) const;
+  bool KeyMayMatch(const Slice& key, const Slice& filter) const override;
 };
 
 // Modules in this directory should keep internal keys wrapped inside
@@ -144,13 +134,18 @@ class InternalFilterPolicy : public FilterPolicy {
 class InternalKey {
  private:
   std::string rep_;
+
  public:
-  InternalKey() { }   // Leave rep_ as empty to indicate it is invalid
+  InternalKey() {}  // Leave rep_ as empty to indicate it is invalid
   InternalKey(const Slice& user_key, SequenceNumber s, ValueType t) {
     AppendInternalKey(&rep_, ParsedInternalKey(user_key, s, t));
   }
 
-  void DecodeFrom(const Slice& s) { rep_.assign(s.data(), s.size()); }
+  bool DecodeFrom(const Slice& s) {
+    rep_.assign(s.data(), s.size());
+    return !rep_.empty();
+  }
+
   Slice Encode() const {
     assert(!rep_.empty());
     return rep_;
@@ -168,8 +163,8 @@ class InternalKey {
   std::string DebugString() const;
 };
 
-inline int InternalKeyComparator::Compare(
+inline int InternalKeyComparator::Compare(const InternalKey& a,
-    const InternalKey& a, const InternalKey& b) const {
+                                          const InternalKey& b) const {
   return Compare(a.Encode(), b.Encode());
 }
 
@@ -178,11 +173,11 @@ inline bool ParseInternalKey(const Slice& internal_key,
   const size_t n = internal_key.size();
   if (n < 8) return false;
   uint64_t num = DecodeFixed64(internal_key.data() + n - 8);
-  unsigned char c = num & 0xff;
+  uint8_t c = num & 0xff;
   result->sequence = num >> 8;
   result->type = static_cast<ValueType>(c);
   result->user_key = Slice(internal_key.data(), n - 8);
-  return (c <= static_cast<unsigned char>(kTypeValue));
+  return (c <= static_cast<uint8_t>(kTypeValue));
 }
 
 // A helper class useful for DBImpl::Get()
@@ -192,6 +187,9 @@ class LookupKey {
   // the specified sequence number.
   LookupKey(const Slice& user_key, SequenceNumber sequence);
 
+  LookupKey(const LookupKey&) = delete;
+  LookupKey& operator=(const LookupKey&) = delete;
+
   ~LookupKey();
 
   // Return a key suitable for lookup in a MemTable.
@@ -215,10 +213,6 @@ class LookupKey {
   const char* kstart_;
   const char* end_;
   char space_[200];  // Avoid allocation for short keys
-
-  // No copying allowed
-  LookupKey(const LookupKey&);
-  void operator=(const LookupKey&);
 };
 
 inline LookupKey::~LookupKey() {

db/dbformat_test.cc

@@ -8,8 +8,7 @@
 
 namespace leveldb {
 
-static std::string IKey(const std::string& user_key,
+static std::string IKey(const std::string& user_key, uint64_t seq,
-                        uint64_t seq,
                         ValueType vt) {
   std::string encoded;
   AppendInternalKey(&encoded, ParsedInternalKey(user_key, seq, vt));
@@ -28,9 +27,7 @@ static std::string ShortSuccessor(const std::string& s) {
   return result;
 }
 
-static void TestKey(const std::string& key,
+static void TestKey(const std::string& key, uint64_t seq, ValueType vt) {
-                    uint64_t seq,
-                    ValueType vt) {
   std::string encoded = IKey(key, seq, vt);
 
   Slice in(encoded);
@@ -44,16 +41,22 @@ static void TestKey(const std::string& key,
   ASSERT_TRUE(!ParseInternalKey(Slice("bar"), &decoded));
 }
 
-class FormatTest { };
+class FormatTest {};
 
 TEST(FormatTest, InternalKey_EncodeDecode) {
-  const char* keys[] = { "", "k", "hello", "longggggggggggggggggggggg" };
+  const char* keys[] = {"", "k", "hello", "longggggggggggggggggggggg"};
-  const uint64_t seq[] = {
+  const uint64_t seq[] = {1,
-    1, 2, 3,
+                          2,
-    (1ull << 8) - 1, 1ull << 8, (1ull << 8) + 1,
+                          3,
-    (1ull << 16) - 1, 1ull << 16, (1ull << 16) + 1,
+                          (1ull << 8) - 1,
-    (1ull << 32) - 1, 1ull << 32, (1ull << 32) + 1
+                          1ull << 8,
-  };
+                          (1ull << 8) + 1,
+                          (1ull << 16) - 1,
+                          1ull << 16,
+                          (1ull << 16) + 1,
+                          (1ull << 32) - 1,
+                          1ull << 32,
+                          (1ull << 32) + 1};
   for (int k = 0; k < sizeof(keys) / sizeof(keys[0]); k++) {
     for (int s = 0; s < sizeof(seq) / sizeof(seq[0]); s++) {
       TestKey(keys[k], seq[s], kTypeValue);
@@ -62,40 +65,44 @@ TEST(FormatTest, InternalKey_EncodeDecode) {
   }
 }
 
+TEST(FormatTest, InternalKey_DecodeFromEmpty) {
+  InternalKey internal_key;
+
+  ASSERT_TRUE(!internal_key.DecodeFrom(""));
+}
+
 TEST(FormatTest, InternalKeyShortSeparator) {
   // When user keys are same
   ASSERT_EQ(IKey("foo", 100, kTypeValue),
-            Shorten(IKey("foo", 100, kTypeValue),
+            Shorten(IKey("foo", 100, kTypeValue), IKey("foo", 99, kTypeValue)));
-                    IKey("foo", 99, kTypeValue)));
+  ASSERT_EQ(
-  ASSERT_EQ(IKey("foo", 100, kTypeValue),
+      IKey("foo", 100, kTypeValue),
-            Shorten(IKey("foo", 100, kTypeValue),
+      Shorten(IKey("foo", 100, kTypeValue), IKey("foo", 101, kTypeValue)));
-                    IKey("foo", 101, kTypeValue)));
+  ASSERT_EQ(
-  ASSERT_EQ(IKey("foo", 100, kTypeValue),
+      IKey("foo", 100, kTypeValue),
-            Shorten(IKey("foo", 100, kTypeValue),
+      Shorten(IKey("foo", 100, kTypeValue), IKey("foo", 100, kTypeValue)));
-                    IKey("foo", 100, kTypeValue)));
+  ASSERT_EQ(
-  ASSERT_EQ(IKey("foo", 100, kTypeValue),
+      IKey("foo", 100, kTypeValue),
-            Shorten(IKey("foo", 100, kTypeValue),
+      Shorten(IKey("foo", 100, kTypeValue), IKey("foo", 100, kTypeDeletion)));
-                    IKey("foo", 100, kTypeDeletion)));
 
   // When user keys are misordered
   ASSERT_EQ(IKey("foo", 100, kTypeValue),
-            Shorten(IKey("foo", 100, kTypeValue),
+            Shorten(IKey("foo", 100, kTypeValue), IKey("bar", 99, kTypeValue)));
-                    IKey("bar", 99, kTypeValue)));
 
   // When user keys are different, but correctly ordered
-  ASSERT_EQ(IKey("g", kMaxSequenceNumber, kValueTypeForSeek),
+  ASSERT_EQ(
-            Shorten(IKey("foo", 100, kTypeValue),
+      IKey("g", kMaxSequenceNumber, kValueTypeForSeek),
-                    IKey("hello", 200, kTypeValue)));
+      Shorten(IKey("foo", 100, kTypeValue), IKey("hello", 200, kTypeValue)));
 
   // When start user key is prefix of limit user key
-  ASSERT_EQ(IKey("foo", 100, kTypeValue),
+  ASSERT_EQ(
-            Shorten(IKey("foo", 100, kTypeValue),
+      IKey("foo", 100, kTypeValue),
-                    IKey("foobar", 200, kTypeValue)));
+      Shorten(IKey("foo", 100, kTypeValue), IKey("foobar", 200, kTypeValue)));
 
   // When limit user key is prefix of start user key
-  ASSERT_EQ(IKey("foobar", 100, kTypeValue),
+  ASSERT_EQ(
-            Shorten(IKey("foobar", 100, kTypeValue),
+      IKey("foobar", 100, kTypeValue),
-                    IKey("foo", 200, kTypeValue)));
+      Shorten(IKey("foobar", 100, kTypeValue), IKey("foo", 200, kTypeValue)));
 }
 
 TEST(FormatTest, InternalKeyShortestSuccessor) {
@@ -105,8 +112,20 @@ TEST(FormatTest, InternalKeyShortestSuccessor) {
             ShortSuccessor(IKey("\xff\xff", 100, kTypeValue)));
 }
 
+TEST(FormatTest, ParsedInternalKeyDebugString) {
+  ParsedInternalKey key("The \"key\" in 'single quotes'", 42, kTypeValue);
+
+  ASSERT_EQ("'The \"key\" in 'single quotes'' @ 42 : 1", key.DebugString());
+}
+
+TEST(FormatTest, InternalKeyDebugString) {
+  InternalKey key("The \"key\" in 'single quotes'", 42, kTypeValue);
+  ASSERT_EQ("'The \"key\" in 'single quotes'' @ 42 : 1", key.DebugString());
+
+  InternalKey invalid_key;
+  ASSERT_EQ("(bad)", invalid_key.DebugString());
+}
+
 }  // namespace leveldb
 
-int main(int argc, char** argv) {
+int main(int argc, char** argv) { return leveldb::test::RunAllTests(); }
-  return leveldb::test::RunAllTests();
-}

db/dumpfile.cc

@@ -2,7 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 
+#include "leveldb/dumpfile.h"
+
 #include <stdio.h>
+
 #include "db/dbformat.h"
 #include "db/filename.h"
 #include "db/log_reader.h"
@@ -35,8 +38,7 @@ bool GuessType(const std::string& fname, FileType* type) {
 // Notified when log reader encounters corruption.
 class CorruptionReporter : public log::Reader::Reporter {
  public:
-  WritableFile* dst_;
+  void Corruption(size_t bytes, const Status& status) override {
-  virtual void Corruption(size_t bytes, const Status& status) {
     std::string r = "corruption: ";
     AppendNumberTo(&r, bytes);
     r += " bytes; ";
@@ -44,6 +46,8 @@ class CorruptionReporter : public log::Reader::Reporter {
     r.push_back('\n');
     dst_->Append(r);
   }
+
+  WritableFile* dst_;
 };
 
 // Print contents of a log file. (*func)() is called on every record.
@@ -70,8 +74,7 @@ Status PrintLogContents(Env* env, const std::string& fname,
 // Called on every item found in a WriteBatch.
 class WriteBatchItemPrinter : public WriteBatch::Handler {
  public:
-  WritableFile* dst_;
+  void Put(const Slice& key, const Slice& value) override {
-  virtual void Put(const Slice& key, const Slice& value) {
     std::string r = "  put '";
     AppendEscapedStringTo(&r, key);
     r += "' '";
@@ -79,14 +82,15 @@ class WriteBatchItemPrinter : public WriteBatch::Handler {
     r += "'\n";
     dst_->Append(r);
   }
-  virtual void Delete(const Slice& key) {
+  void Delete(const Slice& key) override {
     std::string r = "  del '";
     AppendEscapedStringTo(&r, key);
     r += "'\n";
     dst_->Append(r);
   }
-};
 
+  WritableFile* dst_;
+};
 
 // Called on every log record (each one of which is a WriteBatch)
 // found in a kLogFile.
@@ -142,8 +146,8 @@ Status DumpDescriptor(Env* env, const std::string& fname, WritableFile* dst) {
 
 Status DumpTable(Env* env, const std::string& fname, WritableFile* dst) {
   uint64_t file_size;
-  RandomAccessFile* file = NULL;
+  RandomAccessFile* file = nullptr;
-  Table* table = NULL;
+  Table* table = nullptr;
   Status s = env->GetFileSize(fname, &file_size);
   if (s.ok()) {
     s = env->NewRandomAccessFile(fname, &file);
@@ -213,9 +217,12 @@ Status DumpFile(Env* env, const std::string& fname, WritableFile* dst) {
     return Status::InvalidArgument(fname + ": unknown file type");
   }
   switch (ftype) {
-    case kLogFile:         return DumpLog(env, fname, dst);
+    case kLogFile:
-    case kDescriptorFile:  return DumpDescriptor(env, fname, dst);
+      return DumpLog(env, fname, dst);
-    case kTableFile:       return DumpTable(env, fname, dst);
+    case kDescriptorFile:
+      return DumpDescriptor(env, fname, dst);
+    case kTableFile:
+      return DumpTable(env, fname, dst);
     default:
       break;
   }

db/fault_injection_test.cc

@@ -6,18 +6,20 @@
 // the last "sync". It then checks for data loss errors by purposely dropping
 // file data (or entire files) not protected by a "sync".
 
-#include "leveldb/db.h"
-
 #include <map>
 #include <set>
+
 #include "db/db_impl.h"
 #include "db/filename.h"
 #include "db/log_format.h"
 #include "db/version_set.h"
 #include "leveldb/cache.h"
+#include "leveldb/db.h"
 #include "leveldb/env.h"
 #include "leveldb/table.h"
 #include "leveldb/write_batch.h"
+#include "port/port.h"
+#include "port/thread_annotations.h"
 #include "util/logging.h"
 #include "util/mutexlock.h"
 #include "util/testharness.h"
@@ -34,7 +36,7 @@ class FaultInjectionTestEnv;
 namespace {
 
 // Assume a filename, and not a directory name like "/foo/bar/"
-static std::string GetDirName(const std::string filename) {
+static std::string GetDirName(const std::string& filename) {
   size_t found = filename.find_last_of("/\\");
   if (found == std::string::npos) {
     return "";
@@ -54,8 +56,7 @@ Status Truncate(const std::string& filename, uint64_t length) {
 
   SequentialFile* orig_file;
   Status s = env->NewSequentialFile(filename, &orig_file);
-  if (!s.ok())
+  if (!s.ok()) return s;
-    return s;
 
   char* scratch = new char[length];
   leveldb::Slice result;
@@ -83,15 +84,15 @@ Status Truncate(const std::string& filename, uint64_t length) {
 
 struct FileState {
   std::string filename_;
-  ssize_t pos_;
+  int64_t pos_;
-  ssize_t pos_at_last_sync_;
+  int64_t pos_at_last_sync_;
-  ssize_t pos_at_last_flush_;
+  int64_t pos_at_last_flush_;
 
   FileState(const std::string& filename)
       : filename_(filename),
         pos_(-1),
         pos_at_last_sync_(-1),
-        pos_at_last_flush_(-1) { }
+        pos_at_last_flush_(-1) {}
 
   FileState() : pos_(-1), pos_at_last_sync_(-1), pos_at_last_flush_(-1) {}
 
@@ -106,14 +107,14 @@ struct FileState {
 // is written to or sync'ed.
 class TestWritableFile : public WritableFile {
  public:
-  TestWritableFile(const FileState& state,
+  TestWritableFile(const FileState& state, WritableFile* f,
-                   WritableFile* f,
                    FaultInjectionTestEnv* env);
-  virtual ~TestWritableFile();
+  ~TestWritableFile() override;
-  virtual Status Append(const Slice& data);
+  Status Append(const Slice& data) override;
-  virtual Status Close();
+  Status Close() override;
-  virtual Status Flush();
+  Status Flush() override;
-  virtual Status Sync();
+  Status Sync() override;
+  std::string GetName() const override { return ""; }
 
  private:
   FileState state_;
@@ -126,14 +127,15 @@ class TestWritableFile : public WritableFile {
 
 class FaultInjectionTestEnv : public EnvWrapper {
  public:
-  FaultInjectionTestEnv() : EnvWrapper(Env::Default()), filesystem_active_(true) {}
+  FaultInjectionTestEnv()
-  virtual ~FaultInjectionTestEnv() { }
+      : EnvWrapper(Env::Default()), filesystem_active_(true) {}
-  virtual Status NewWritableFile(const std::string& fname,
+  ~FaultInjectionTestEnv() override = default;
-                                 WritableFile** result);
+  Status NewWritableFile(const std::string& fname,
-  virtual Status NewAppendableFile(const std::string& fname,
+                         WritableFile** result) override;
-                                   WritableFile** result);
+  Status NewAppendableFile(const std::string& fname,
-  virtual Status DeleteFile(const std::string& f);
+                           WritableFile** result) override;
-  virtual Status RenameFile(const std::string& s, const std::string& t);
+  Status DeleteFile(const std::string& f) override;
+  Status RenameFile(const std::string& s, const std::string& t) override;
 
   void WritableFileClosed(const FileState& state);
   Status DropUnsyncedFileData();
@@ -146,24 +148,26 @@ class FaultInjectionTestEnv : public EnvWrapper {
   // system reset. Setting to inactive will freeze our saved filesystem state so
   // that it will stop being recorded. It can then be reset back to the state at
   // the time of the reset.
-  bool IsFilesystemActive() const { return filesystem_active_; }
+  bool IsFilesystemActive() LOCKS_EXCLUDED(mutex_) {
-  void SetFilesystemActive(bool active) { filesystem_active_ = active; }
+    MutexLock l(&mutex_);
+    return filesystem_active_;
+  }
+  void SetFilesystemActive(bool active) LOCKS_EXCLUDED(mutex_) {
+    MutexLock l(&mutex_);
+    filesystem_active_ = active;
+  }
 
  private:
   port::Mutex mutex_;
-  std::map<std::string, FileState> db_file_state_;
+  std::map<std::string, FileState> db_file_state_ GUARDED_BY(mutex_);
-  std::set<std::string> new_files_since_last_dir_sync_;
+  std::set<std::string> new_files_since_last_dir_sync_ GUARDED_BY(mutex_);
-  bool filesystem_active_;  // Record flushes, syncs, writes
+  bool filesystem_active_ GUARDED_BY(mutex_);  // Record flushes, syncs, writes
 };
 
-TestWritableFile::TestWritableFile(const FileState& state,
+TestWritableFile::TestWritableFile(const FileState& state, WritableFile* f,
-                                   WritableFile* f,
                                    FaultInjectionTestEnv* env)
-    : state_(state),
+    : state_(state), target_(f), writable_file_opened_(true), env_(env) {
-      target_(f),
+  assert(f != nullptr);
-      writable_file_opened_(true),
-      env_(env) {
-  assert(f != NULL);
 }
 
 TestWritableFile::~TestWritableFile() {
@@ -265,10 +269,11 @@ Status FaultInjectionTestEnv::NewAppendableFile(const std::string& fname,
 Status FaultInjectionTestEnv::DropUnsyncedFileData() {
   Status s;
   MutexLock l(&mutex_);
-  for (std::map<std::string, FileState>::const_iterator it =
+  for (const auto& kvp : db_file_state_) {
-           db_file_state_.begin();
+    if (!s.ok()) {
-       s.ok() && it != db_file_state_.end(); ++it) {
+      break;
-    const FileState& state = it->second;
+    }
+    const FileState& state = kvp.second;
     if (!state.IsFullySynced()) {
       s = state.DropUnsyncedData();
     }
@@ -328,7 +333,6 @@ void FaultInjectionTestEnv::ResetState() {
   // Since we are not destroying the database, the existing files
   // should keep their recorded synced/flushed state. Therefore
   // we do not reset db_file_state_ and new_files_since_last_dir_sync_.
-  MutexLock l(&mutex_);
   SetFilesystemActive(true);
 }
 
@@ -338,12 +342,14 @@ Status FaultInjectionTestEnv::DeleteFilesCreatedAfterLastDirSync() {
   std::set<std::string> new_files(new_files_since_last_dir_sync_.begin(),
                                   new_files_since_last_dir_sync_.end());
   mutex_.Unlock();
-  Status s;
+  Status status;
-  std::set<std::string>::const_iterator it;
+  for (const auto& new_file : new_files) {
-  for (it = new_files.begin(); s.ok() && it != new_files.end(); ++it) {
+    Status delete_status = DeleteFile(new_file);
-    s = DeleteFile(*it);
+    if (!delete_status.ok() && status.ok()) {
+      status = std::move(delete_status);
     }
-  return s;
+  }
+  return status;
 }
 
 void FaultInjectionTestEnv::WritableFileClosed(const FileState& state) {
@@ -352,7 +358,7 @@ void FaultInjectionTestEnv::WritableFileClosed(const FileState& state) {
 }
 
 Status FileState::DropUnsyncedData() const {
-  ssize_t sync_pos = pos_at_last_sync_ == -1 ? 0 : pos_at_last_sync_;
+  int64_t sync_pos = pos_at_last_sync_ == -1 ? 0 : pos_at_last_sync_;
   return Truncate(filename_, sync_pos);
 }
 
@@ -370,7 +376,7 @@ class FaultInjectionTest {
   FaultInjectionTest()
       : env_(new FaultInjectionTestEnv),
         tiny_cache_(NewLRUCache(100)),
-        db_(NULL) {
+        db_(nullptr) {
     dbname_ = test::TmpDir() + "/fault_test";
     DestroyDB(dbname_, Options());  // Destroy any db from earlier run
     options_.reuse_logs = true;
@@ -387,9 +393,7 @@ class FaultInjectionTest {
     delete env_;
   }
 
-  void ReuseLogs(bool reuse) {
+  void ReuseLogs(bool reuse) { options_.reuse_logs = reuse; }
-    options_.reuse_logs = reuse;
-  }
 
   void Build(int start_idx, int num_vals) {
     std::string key_space, value_space;
@@ -449,19 +453,18 @@ class FaultInjectionTest {
 
   Status OpenDB() {
     delete db_;
-    db_ = NULL;
+    db_ = nullptr;
     env_->ResetState();
     return DB::Open(options_, dbname_, &db_);
   }
 
   void CloseDB() {
     delete db_;
-    db_ = NULL;
+    db_ = nullptr;
   }
 
   void DeleteAllData() {
     Iterator* iter = db_->NewIterator(ReadOptions());
-    WriteOptions options;
     for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
       ASSERT_OK(db_->Delete(WriteOptions(), iter->key()));
     }
@@ -485,23 +488,22 @@ class FaultInjectionTest {
   void PartialCompactTestPreFault(int num_pre_sync, int num_post_sync) {
     DeleteAllData();
     Build(0, num_pre_sync);
-    db_->CompactRange(NULL, NULL);
+    db_->CompactRange(nullptr, nullptr);
     Build(num_pre_sync, num_post_sync);
   }
 
   void PartialCompactTestReopenWithFault(ResetMethod reset_method,
-                                         int num_pre_sync,
+                                         int num_pre_sync, int num_post_sync) {
-                                         int num_post_sync) {
     env_->SetFilesystemActive(false);
     CloseDB();
     ResetDBState(reset_method);
     ASSERT_OK(OpenDB());
     ASSERT_OK(Verify(0, num_pre_sync, FaultInjectionTest::VAL_EXPECT_NO_ERROR));
-    ASSERT_OK(Verify(num_pre_sync, num_post_sync, FaultInjectionTest::VAL_EXPECT_ERROR));
+    ASSERT_OK(Verify(num_pre_sync, num_post_sync,
+                     FaultInjectionTest::VAL_EXPECT_ERROR));
   }
 
-  void NoWriteTestPreFault() {
+  void NoWriteTestPreFault() {}
-  }
 
   void NoWriteTestReopenWithFault(ResetMethod reset_method) {
     CloseDB();
@@ -517,8 +519,7 @@ class FaultInjectionTest {
       int num_post_sync = rnd.Uniform(kMaxNumValues);
 
       PartialCompactTestPreFault(num_pre_sync, num_post_sync);
-      PartialCompactTestReopenWithFault(RESET_DROP_UNSYNCED_DATA,
+      PartialCompactTestReopenWithFault(RESET_DROP_UNSYNCED_DATA, num_pre_sync,
-                                        num_pre_sync,
                                         num_post_sync);
 
       NoWriteTestPreFault();
@@ -528,8 +529,7 @@ class FaultInjectionTest {
       // No new files created so we expect all values since no files will be
       // dropped.
       PartialCompactTestReopenWithFault(RESET_DELETE_UNSYNCED_FILES,
-                                        num_pre_sync + num_post_sync,
+                                        num_pre_sync + num_post_sync, 0);
-                                        0);
 
       NoWriteTestPreFault();
       NoWriteTestReopenWithFault(RESET_DELETE_UNSYNCED_FILES);
@@ -549,6 +549,4 @@ TEST(FaultInjectionTest, FaultTestWithLogReuse) {
 
 }  // namespace leveldb
 
-int main(int argc, char** argv) {
+int main(int argc, char** argv) { return leveldb::test::RunAllTests(); }
-  return leveldb::test::RunAllTests();
-}

db/filename.cc

@@ -2,9 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 
+#include "db/filename.h"
+
 #include <ctype.h>
 #include <stdio.h>
-#include "db/filename.h"
+
 #include "db/dbformat.h"
 #include "leveldb/env.h"
 #include "util/logging.h"
@@ -12,31 +14,30 @@
 namespace leveldb {
 
 // A utility routine: write "data" to the named file and Sync() it.
-extern Status WriteStringToFileSync(Env* env, const Slice& data,
+Status WriteStringToFileSync(Env* env, const Slice& data,
                              const std::string& fname);
 
-static std::string MakeFileName(const std::string& name, uint64_t number,
+static std::string MakeFileName(const std::string& dbname, uint64_t number,
                                 const char* suffix) {
   char buf[100];
   snprintf(buf, sizeof(buf), "/%06llu.%s",
-           static_cast<unsigned long long>(number),
+           static_cast<unsigned long long>(number), suffix);
-           suffix);
+  return dbname + buf;
-  return name + buf;
 }
 
-std::string LogFileName(const std::string& name, uint64_t number) {
+std::string LogFileName(const std::string& dbname, uint64_t number) {
   assert(number > 0);
-  return MakeFileName(name, number, "log");
+  return MakeFileName(dbname, number, "log");
 }
 
-std::string TableFileName(const std::string& name, uint64_t number) {
+std::string TableFileName(const std::string& dbname, uint64_t number) {
   assert(number > 0);
-  return MakeFileName(name, number, "ldb");
+  return MakeFileName(dbname, number, "ldb");
 }
 
-std::string SSTTableFileName(const std::string& name, uint64_t number) {
+std::string SSTTableFileName(const std::string& dbname, uint64_t number) {
   assert(number > 0);
-  return MakeFileName(name, number, "sst");
+  return MakeFileName(dbname, number, "sst");
 }
 
 std::string DescriptorFileName(const std::string& dbname, uint64_t number) {
@@ -51,9 +52,7 @@ std::string CurrentFileName(const std::string& dbname) {
   return dbname + "/CURRENT";
 }
 
-std::string LockFileName(const std::string& dbname) {
+std::string LockFileName(const std::string& dbname) { return dbname + "/LOCK"; }
-  return dbname + "/LOCK";
-}
 
 std::string TempFileName(const std::string& dbname, uint64_t number) {
   assert(number > 0);
@@ -69,7 +68,6 @@ std::string OldInfoLogFileName(const std::string& dbname) {
   return dbname + "/LOG.old";
 }
 
-
 // Owned filenames have the form:
 //    dbname/CURRENT
 //    dbname/LOCK
@@ -77,10 +75,9 @@ std::string OldInfoLogFileName(const std::string& dbname) {
 //    dbname/LOG.old
 //    dbname/MANIFEST-[0-9]+
 //    dbname/[0-9]+.(log|sst|ldb)
-bool ParseFileName(const std::string& fname,
+bool ParseFileName(const std::string& filename, uint64_t* number,
-                   uint64_t* number,
                    FileType* type) {
-  Slice rest(fname);
+  Slice rest(filename);
   if (rest == "CURRENT") {
     *number = 0;
     *type = kCurrentFile;

db/filename.h

@@ -8,7 +8,9 @@
 #define STORAGE_LEVELDB_DB_FILENAME_H_
 
 #include <stdint.h>
+
 #include <string>
+
 #include "leveldb/slice.h"
 #include "leveldb/status.h"
 #include "port/port.h"
@@ -30,56 +32,53 @@ enum FileType {
 // Return the name of the log file with the specified number
 // in the db named by "dbname".  The result will be prefixed with
 // "dbname".
-extern std::string LogFileName(const std::string& dbname, uint64_t number);
+std::string LogFileName(const std::string& dbname, uint64_t number);
 
 // Return the name of the sstable with the specified number
 // in the db named by "dbname".  The result will be prefixed with
 // "dbname".
-extern std::string TableFileName(const std::string& dbname, uint64_t number);
+std::string TableFileName(const std::string& dbname, uint64_t number);
 
 // Return the legacy file name for an sstable with the specified number
 // in the db named by "dbname". The result will be prefixed with
 // "dbname".
-extern std::string SSTTableFileName(const std::string& dbname, uint64_t number);
+std::string SSTTableFileName(const std::string& dbname, uint64_t number);
 
 // Return the name of the descriptor file for the db named by
 // "dbname" and the specified incarnation number.  The result will be
 // prefixed with "dbname".
-extern std::string DescriptorFileName(const std::string& dbname,
+std::string DescriptorFileName(const std::string& dbname, uint64_t number);
-                                      uint64_t number);
 
 // Return the name of the current file.  This file contains the name
 // of the current manifest file.  The result will be prefixed with
 // "dbname".
-extern std::string CurrentFileName(const std::string& dbname);
+std::string CurrentFileName(const std::string& dbname);
 
 // Return the name of the lock file for the db named by
 // "dbname".  The result will be prefixed with "dbname".
-extern std::string LockFileName(const std::string& dbname);
+std::string LockFileName(const std::string& dbname);
 
 // Return the name of a temporary file owned by the db named "dbname".
 // The result will be prefixed with "dbname".
-extern std::string TempFileName(const std::string& dbname, uint64_t number);
+std::string TempFileName(const std::string& dbname, uint64_t number);
 
 // Return the name of the info log file for "dbname".
-extern std::string InfoLogFileName(const std::string& dbname);
+std::string InfoLogFileName(const std::string& dbname);
 
 // Return the name of the old info log file for "dbname".
-extern std::string OldInfoLogFileName(const std::string& dbname);
+std::string OldInfoLogFileName(const std::string& dbname);
 
 // If filename is a leveldb file, store the type of the file in *type.
 // The number encoded in the filename is stored in *number.  If the
 // filename was successfully parsed, returns true.  Else return false.
-extern bool ParseFileName(const std::string& filename,
+bool ParseFileName(const std::string& filename, uint64_t* number,
-                          uint64_t* number,
                    FileType* type);
 
 // Make the CURRENT file point to the descriptor file with the
 // specified number.
-extern Status SetCurrentFile(Env* env, const std::string& dbname,
+Status SetCurrentFile(Env* env, const std::string& dbname,
                       uint64_t descriptor_number);
 
-
 }  // namespace leveldb
 
 #endif  // STORAGE_LEVELDB_DB_FILENAME_H_

db/filename_test.cc

@@ -11,7 +11,7 @@
 
 namespace leveldb {
 
-class FileNameTest { };
+class FileNameTest {};
 
 TEST(FileNameTest, Parse) {
   Slice db;
@@ -24,17 +24,17 @@ TEST(FileNameTest, Parse) {
     uint64_t number;
     FileType type;
   } cases[] = {
-    { "100.log",            100,   kLogFile },
+      {"100.log", 100, kLogFile},
-    { "0.log",              0,     kLogFile },
+      {"0.log", 0, kLogFile},
-    { "0.sst",              0,     kTableFile },
+      {"0.sst", 0, kTableFile},
-    { "0.ldb",              0,     kTableFile },
+      {"0.ldb", 0, kTableFile},
-    { "CURRENT",            0,     kCurrentFile },
+      {"CURRENT", 0, kCurrentFile},
-    { "LOCK",               0,     kDBLockFile },
+      {"LOCK", 0, kDBLockFile},
-    { "MANIFEST-2",         2,     kDescriptorFile },
+      {"MANIFEST-2", 2, kDescriptorFile},
-    { "MANIFEST-7",         7,     kDescriptorFile },
+      {"MANIFEST-7", 7, kDescriptorFile},
-    { "LOG",                0,     kInfoLogFile },
+      {"LOG", 0, kInfoLogFile},
-    { "LOG.old",            0,     kInfoLogFile },
+      {"LOG.old", 0, kInfoLogFile},
-    { "18446744073709551615.log", 18446744073709551615ull, kLogFile },
+      {"18446744073709551615.log", 18446744073709551615ull, kLogFile},
   };
   for (int i = 0; i < sizeof(cases) / sizeof(cases[0]); i++) {
     std::string f = cases[i].fname;
@@ -44,8 +44,7 @@ TEST(FileNameTest, Parse) {
   }
 
   // Errors
-  static const char* errors[] = {
+  static const char* errors[] = {"",
-    "",
                                  "foo",
                                  "foo-dx-100.log",
                                  ".log",
@@ -66,8 +65,7 @@ TEST(FileNameTest, Parse) {
                                  "184467440737095516150.log",
                                  "100",
                                  "100.",
-    "100.lop"
+                                 "100.lop"};
-  };
   for (int i = 0; i < sizeof(errors) / sizeof(errors[0]); i++) {
     std::string f = errors[i];
     ASSERT_TRUE(!ParseFileName(f, &number, &type)) << f;
@@ -114,10 +112,20 @@ TEST(FileNameTest, Construction) {
   ASSERT_TRUE(ParseFileName(fname.c_str() + 4, &number, &type));
   ASSERT_EQ(999, number);
   ASSERT_EQ(kTempFile, type);
+
+  fname = InfoLogFileName("foo");
+  ASSERT_EQ("foo/", std::string(fname.data(), 4));
+  ASSERT_TRUE(ParseFileName(fname.c_str() + 4, &number, &type));
+  ASSERT_EQ(0, number);
+  ASSERT_EQ(kInfoLogFile, type);
+
+  fname = OldInfoLogFileName("foo");
+  ASSERT_EQ("foo/", std::string(fname.data(), 4));
+  ASSERT_TRUE(ParseFileName(fname.c_str() + 4, &number, &type));
+  ASSERT_EQ(0, number);
+  ASSERT_EQ(kInfoLogFile, type);
 }
 
 }  // namespace leveldb
 
-int main(int argc, char** argv) {
+int main(int argc, char** argv) { return leveldb::test::RunAllTests(); }
-  return leveldb::test::RunAllTests();
-}

db/leveldbutil.cc

@@ -3,6 +3,7 @@
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 
 #include <stdio.h>
+
 #include "leveldb/dumpfile.h"
 #include "leveldb/env.h"
 #include "leveldb/status.h"
@@ -12,14 +13,14 @@ namespace {
 
 class StdoutPrinter : public WritableFile {
  public:
-  virtual Status Append(const Slice& data) {
+  Status Append(const Slice& data) override {
     fwrite(data.data(), 1, data.size(), stdout);
     return Status::OK();
   }
-  virtual Status Close() { return Status::OK(); }
+  Status Close() override { return Status::OK(); }
-  virtual Status Flush() { return Status::OK(); }
+  Status Flush() override { return Status::OK(); }
-  virtual Status Sync() { return Status::OK(); }
+  Status Sync() override { return Status::OK(); }
-  virtual std::string GetName() const { return "[stdout]"; }
+  std::string GetName() const override { return "[stdout]"; }
 };
 
 bool HandleDumpCommand(Env* env, char** files, int num) {
@@ -39,11 +40,9 @@ bool HandleDumpCommand(Env* env, char** files, int num) {
 }  // namespace leveldb
 
 static void Usage() {
-  fprintf(
+  fprintf(stderr,
-      stderr,
           "Usage: leveldbutil command...\n"
-      "   dump files...         -- dump contents of specified files\n"
+          "   dump files...         -- dump contents of specified files\n");
-      );
 }
 
 int main(int argc, char** argv) {
@@ -55,7 +54,7 @@ int main(int argc, char** argv) {
   } else {
     std::string command = argv[1];
     if (command == "dump") {
-      ok = leveldb::HandleDumpCommand(env, argv+2, argc-2);
+      ok = leveldb::HandleDumpCommand(env, argv + 2, argc - 2);
     } else {
       Usage();
       ok = false;

db/log_reader.cc

@@ -5,6 +5,7 @@
 #include "db/log_reader.h"
 
 #include <stdio.h>
+
 #include "leveldb/env.h"
 #include "util/coding.h"
 #include "util/crc32c.h"
@@ -12,8 +13,7 @@
 namespace leveldb {
 namespace log {
 
-Reader::Reporter::~Reporter() {
+Reader::Reporter::~Reporter() = default;
-}
 
 Reader::Reader(SequentialFile* file, Reporter* reporter, bool checksum,
                uint64_t initial_offset)
@@ -26,20 +26,16 @@ Reader::Reader(SequentialFile* file, Reporter* reporter, bool checksum,
       last_record_offset_(0),
       end_of_buffer_offset_(0),
       initial_offset_(initial_offset),
-      resyncing_(initial_offset > 0) {
+      resyncing_(initial_offset > 0) {}
-}
 
-Reader::~Reader() {
+Reader::~Reader() { delete[] backing_store_; }
-  delete[] backing_store_;
-}
 
 bool Reader::SkipToInitialBlock() {
-  size_t offset_in_block = initial_offset_ % kBlockSize;
+  const size_t offset_in_block = initial_offset_ % kBlockSize;
   uint64_t block_start_location = initial_offset_ - offset_in_block;
 
   // Don't search a block if we'd be in the trailer
   if (offset_in_block > kBlockSize - 6) {
-    offset_in_block = 0;
     block_start_location += kBlockSize;
   }
 
@@ -99,9 +95,7 @@ bool Reader::ReadRecord(Slice* record, std::string* scratch) {
           // it could emit an empty kFirstType record at the tail end
           // of a block followed by a kFullType or kFirstType record
           // at the beginning of the next block.
-          if (scratch->empty()) {
+          if (!scratch->empty()) {
-            in_fragmented_record = false;
-          } else {
             ReportCorruption(scratch->size(), "partial record without end(1)");
           }
         }
@@ -117,9 +111,7 @@ bool Reader::ReadRecord(Slice* record, std::string* scratch) {
           // it could emit an empty kFirstType record at the tail end
           // of a block followed by a kFullType or kFirstType record
           // at the beginning of the next block.
-          if (scratch->empty()) {
+          if (!scratch->empty()) {
-            in_fragmented_record = false;
-          } else {
             ReportCorruption(scratch->size(), "partial record without end(2)");
           }
         }
@@ -181,16 +173,14 @@ bool Reader::ReadRecord(Slice* record, std::string* scratch) {
   return false;
 }
 
-uint64_t Reader::LastRecordOffset() {
+uint64_t Reader::LastRecordOffset() { return last_record_offset_; }
-  return last_record_offset_;
-}
 
 void Reader::ReportCorruption(uint64_t bytes, const char* reason) {
   ReportDrop(bytes, Status::Corruption(reason, file_->GetName()));
 }
 
 void Reader::ReportDrop(uint64_t bytes, const Status& reason) {
-  if (reporter_ != NULL &&
+  if (reporter_ != nullptr &&
       end_of_buffer_offset_ - buffer_.size() - bytes >= initial_offset_) {
     reporter_->Corruption(static_cast<size_t>(bytes), reason);
   }

db/log_reader.h

@@ -32,7 +32,7 @@ class Reader {
   // Create a reader that will return log records from "*file".
   // "*file" must remain live while this Reader is in use.
   //
-  // If "reporter" is non-NULL, it is notified whenever some data is
+  // If "reporter" is non-null, it is notified whenever some data is
   // dropped due to a detected corruption.  "*reporter" must remain
   // live while this Reader is in use.
   //
@@ -43,6 +43,9 @@ class Reader {
   Reader(SequentialFile* file, Reporter* reporter, bool checksum,
          uint64_t initial_offset);
 
+  Reader(const Reader&) = delete;
+  Reader& operator=(const Reader&) = delete;
+
   ~Reader();
 
   // Read the next record into *record.  Returns true if read
@@ -58,26 +61,6 @@ class Reader {
   uint64_t LastRecordOffset();
 
  private:
-  SequentialFile* const file_;
-  Reporter* const reporter_;
-  bool const checksum_;
-  char* const backing_store_;
-  Slice buffer_;
-  bool eof_;   // Last Read() indicated EOF by returning < kBlockSize
-
-  // Offset of the last record returned by ReadRecord.
-  uint64_t last_record_offset_;
-  // Offset of the first location past the end of buffer_.
-  uint64_t end_of_buffer_offset_;
-
-  // Offset at which to start looking for the first record to return
-  uint64_t const initial_offset_;
-
-  // True if we are resynchronizing after a seek (initial_offset_ > 0). In
-  // particular, a run of kMiddleType and kLastType records can be silently
-  // skipped in this mode
-  bool resyncing_;
-
   // Extend record types with the following special values
   enum {
     kEof = kMaxRecordType + 1,
@@ -102,9 +85,25 @@ class Reader {
   void ReportCorruption(uint64_t bytes, const char* reason);
   void ReportDrop(uint64_t bytes, const Status& reason);
 
-  // No copying allowed
+  SequentialFile* const file_;
-  Reader(const Reader&);
+  Reporter* const reporter_;
-  void operator=(const Reader&);
+  bool const checksum_;
+  char* const backing_store_;
+  Slice buffer_;
+  bool eof_;  // Last Read() indicated EOF by returning < kBlockSize
+
+  // Offset of the last record returned by ReadRecord.
+  uint64_t last_record_offset_;
+  // Offset of the first location past the end of buffer_.
+  uint64_t end_of_buffer_offset_;
+
+  // Offset at which to start looking for the first record to return
+  uint64_t const initial_offset_;
+
+  // True if we are resynchronizing after a seek (initial_offset_ > 0). In
+  // particular, a run of kMiddleType and kLastType records can be silently
+  // skipped in this mode
+  bool resyncing_;
 };
 
 }  // namespace log

db/log_test.cc

@@ -37,87 +37,12 @@ static std::string RandomSkewedString(int i, Random* rnd) {
 }
 
 class LogTest {
- private:
-  class StringDest : public WritableFile {
  public:
-    std::string contents_;
+  LogTest()
-
+      : reading_(false),
-    virtual Status Close() { return Status::OK(); }
-    virtual Status Flush() { return Status::OK(); }
-    virtual Status Sync() { return Status::OK(); }
-    virtual Status Append(const Slice& slice) {
-      contents_.append(slice.data(), slice.size());
-      return Status::OK();
-    }
-  };
-
-  class StringSource : public SequentialFile {
-   public:
-    Slice contents_;
-    bool force_error_;
-    bool returned_partial_;
-    StringSource() : force_error_(false), returned_partial_(false) { }
-
-    virtual Status Read(size_t n, Slice* result, char* scratch) {
-      ASSERT_TRUE(!returned_partial_) << "must not Read() after eof/error";
-
-      if (force_error_) {
-        force_error_ = false;
-        returned_partial_ = true;
-        return Status::Corruption("read error");
-      }
-
-      if (contents_.size() < n) {
-        n = contents_.size();
-        returned_partial_ = true;
-      }
-      *result = Slice(contents_.data(), n);
-      contents_.remove_prefix(n);
-      return Status::OK();
-    }
-
-    virtual Status Skip(uint64_t n) {
-      if (n > contents_.size()) {
-        contents_.clear();
-        return Status::NotFound("in-memory file skipped past end");
-      }
-
-      contents_.remove_prefix(n);
-
-      return Status::OK();
-    }
-  };
-
-  class ReportCollector : public Reader::Reporter {
-   public:
-    size_t dropped_bytes_;
-    std::string message_;
-
-    ReportCollector() : dropped_bytes_(0) { }
-    virtual void Corruption(size_t bytes, const Status& status) {
-      dropped_bytes_ += bytes;
-      message_.append(status.ToString());
-    }
-  };
-
-  StringDest dest_;
-  StringSource source_;
-  ReportCollector report_;
-  bool reading_;
-  Writer* writer_;
-  Reader* reader_;
-
-  // Record metadata for testing initial offset functionality
-  static size_t initial_offset_record_sizes_[];
-  static uint64_t initial_offset_last_record_offsets_[];
-  static int num_initial_offset_records_;
-
- public:
-  LogTest() : reading_(false),
         writer_(new Writer(&dest_)),
-              reader_(new Reader(&source_, &report_, true/*checksum*/,
+        reader_(new Reader(&source_, &report_, true /*checksum*/,
-                      0/*initial_offset*/)) {
+                           0 /*initial_offset*/)) {}
-  }
 
   ~LogTest() {
     delete writer_;
@@ -134,9 +59,7 @@ class LogTest {
     writer_->AddRecord(Slice(msg));
   }
 
-  size_t WrittenBytes() const {
+  size_t WrittenBytes() const { return dest_.contents_.size(); }
-    return dest_.contents_.size();
-  }
 
   std::string Read() {
     if (!reading_) {
@@ -166,22 +89,16 @@ class LogTest {
 
   void FixChecksum(int header_offset, int len) {
     // Compute crc of type/len/data
-    uint32_t crc = crc32c::Value(&dest_.contents_[header_offset+6], 1 + len);
+    uint32_t crc = crc32c::Value(&dest_.contents_[header_offset + 6], 1 + len);
     crc = crc32c::Mask(crc);
     EncodeFixed32(&dest_.contents_[header_offset], crc);
   }
 
-  void ForceError() {
+  void ForceError() { source_.force_error_ = true; }
-    source_.force_error_ = true;
-  }
 
-  size_t DroppedBytes() const {
+  size_t DroppedBytes() const { return report_.dropped_bytes_; }
-    return report_.dropped_bytes_;
-  }
 
-  std::string ReportMessage() const {
+  std::string ReportMessage() const { return report_.message_; }
-    return report_.message_;
-  }
 
   // Returns OK iff recorded error message contains "msg"
   std::string MatchError(const std::string& msg) const {
@@ -202,14 +119,14 @@ class LogTest {
 
   void StartReadingAt(uint64_t initial_offset) {
     delete reader_;
-    reader_ = new Reader(&source_, &report_, true/*checksum*/, initial_offset);
+    reader_ = new Reader(&source_, &report_, true /*checksum*/, initial_offset);
   }
 
   void CheckOffsetPastEndReturnsNoRecords(uint64_t offset_past_end) {
     WriteInitialOffsetLog();
     reading_ = true;
     source_.contents_ = Slice(dest_.contents_);
-    Reader* offset_reader = new Reader(&source_, &report_, true/*checksum*/,
+    Reader* offset_reader = new Reader(&source_, &report_, true /*checksum*/,
                                        WrittenBytes() + offset_past_end);
     Slice record;
     std::string scratch;
@@ -222,8 +139,8 @@ class LogTest {
     WriteInitialOffsetLog();
     reading_ = true;
     source_.contents_ = Slice(dest_.contents_);
-    Reader* offset_reader = new Reader(&source_, &report_, true/*checksum*/,
+    Reader* offset_reader =
-                                       initial_offset);
+        new Reader(&source_, &report_, true /*checksum*/, initial_offset);
 
     // Read all records from expected_record_offset through the last one.
     ASSERT_LT(expected_record_offset, num_initial_offset_records_);
@@ -240,36 +157,110 @@ class LogTest {
     }
     delete offset_reader;
   }
+
+ private:
+  class StringDest : public WritableFile {
+   public:
+    Status Close() override { return Status::OK(); }
+    Status Flush() override { return Status::OK(); }
+    Status Sync() override { return Status::OK(); }
+    Status Append(const Slice& slice) override {
+      contents_.append(slice.data(), slice.size());
+      return Status::OK();
+    }
+    std::string GetName() const override { return ""; }
+
+    std::string contents_;
+  };
+
+  class StringSource : public SequentialFile {
+   public:
+    StringSource() : force_error_(false), returned_partial_(false) {}
+
+    Status Read(size_t n, Slice* result, char* scratch) override {
+      ASSERT_TRUE(!returned_partial_) << "must not Read() after eof/error";
+
+      if (force_error_) {
+        force_error_ = false;
+        returned_partial_ = true;
+        return Status::Corruption("read error");
+      }
+
+      if (contents_.size() < n) {
+        n = contents_.size();
+        returned_partial_ = true;
+      }
+      *result = Slice(contents_.data(), n);
+      contents_.remove_prefix(n);
+      return Status::OK();
+    }
+
+    Status Skip(uint64_t n) override {
+      if (n > contents_.size()) {
+        contents_.clear();
+        return Status::NotFound("in-memory file skipped past end");
+      }
+
+      contents_.remove_prefix(n);
+
+      return Status::OK();
+    }
+    std::string GetName() const { return ""; }
+
+    Slice contents_;
+    bool force_error_;
+    bool returned_partial_;
+  };
+
+  class ReportCollector : public Reader::Reporter {
+   public:
+    ReportCollector() : dropped_bytes_(0) {}
+    void Corruption(size_t bytes, const Status& status) override {
+      dropped_bytes_ += bytes;
+      message_.append(status.ToString());
+    }
+
+    size_t dropped_bytes_;
+    std::string message_;
+  };
+
+  // Record metadata for testing initial offset functionality
+  static size_t initial_offset_record_sizes_[];
+  static uint64_t initial_offset_last_record_offsets_[];
+  static int num_initial_offset_records_;
+
+  StringDest dest_;
+  StringSource source_;
+  ReportCollector report_;
+  bool reading_;
+  Writer* writer_;
+  Reader* reader_;
 };
 
-size_t LogTest::initial_offset_record_sizes_[] =
+size_t LogTest::initial_offset_record_sizes_[] = {
-    {10000,  // Two sizable records in first block
+    10000,  // Two sizable records in first block
     10000,
     2 * log::kBlockSize - 1000,  // Span three blocks
     1,
     13716,                          // Consume all but two bytes of block 3.
     log::kBlockSize - kHeaderSize,  // Consume the entirety of block 4.
-    };
+};
 
-uint64_t LogTest::initial_offset_last_record_offsets_[] =
+uint64_t LogTest::initial_offset_last_record_offsets_[] = {
-    {0,
+    0,
     kHeaderSize + 10000,
     2 * (kHeaderSize + 10000),
-     2 * (kHeaderSize + 10000) +
+    2 * (kHeaderSize + 10000) + (2 * log::kBlockSize - 1000) + 3 * kHeaderSize,
-         (2 * log::kBlockSize - 1000) + 3 * kHeaderSize,
+    2 * (kHeaderSize + 10000) + (2 * log::kBlockSize - 1000) + 3 * kHeaderSize +
-     2 * (kHeaderSize + 10000) +
+        kHeaderSize + 1,
-         (2 * log::kBlockSize - 1000) + 3 * kHeaderSize
-         + kHeaderSize + 1,
     3 * log::kBlockSize,
-    };
+};
 
 // LogTest::initial_offset_last_record_offsets_ must be defined before this.
 int LogTest::num_initial_offset_records_ =
-    sizeof(LogTest::initial_offset_last_record_offsets_)/sizeof(uint64_t);
+    sizeof(LogTest::initial_offset_last_record_offsets_) / sizeof(uint64_t);
 
-TEST(LogTest, Empty) {
+TEST(LogTest, Empty) { ASSERT_EQ("EOF", Read()); }
-  ASSERT_EQ("EOF", Read());
-}
 
 TEST(LogTest, ReadWrite) {
   Write("foo");
@@ -306,7 +297,7 @@ TEST(LogTest, Fragmentation) {
 
 TEST(LogTest, MarginalTrailer) {
   // Make a trailer that is exactly the same length as an empty record.
-  const int n = kBlockSize - 2*kHeaderSize;
+  const int n = kBlockSize - 2 * kHeaderSize;
   Write(BigString("foo", n));
   ASSERT_EQ(kBlockSize - kHeaderSize, WrittenBytes());
   Write("");
@@ -319,7 +310,7 @@ TEST(LogTest, MarginalTrailer) {
 
 TEST(LogTest, MarginalTrailer2) {
   // Make a trailer that is exactly the same length as an empty record.
-  const int n = kBlockSize - 2*kHeaderSize;
+  const int n = kBlockSize - 2 * kHeaderSize;
   Write(BigString("foo", n));
   ASSERT_EQ(kBlockSize - kHeaderSize, WrittenBytes());
   Write("bar");
@@ -331,7 +322,7 @@ TEST(LogTest, MarginalTrailer2) {
 }
 
 TEST(LogTest, ShortTrailer) {
-  const int n = kBlockSize - 2*kHeaderSize + 4;
+  const int n = kBlockSize - 2 * kHeaderSize + 4;
   Write(BigString("foo", n));
   ASSERT_EQ(kBlockSize - kHeaderSize + 4, WrittenBytes());
   Write("");
@@ -343,7 +334,7 @@ TEST(LogTest, ShortTrailer) {
 }
 
 TEST(LogTest, AlignedEof) {
-  const int n = kBlockSize - 2*kHeaderSize + 4;
+  const int n = kBlockSize - 2 * kHeaderSize + 4;
   Write(BigString("foo", n));
   ASSERT_EQ(kBlockSize - kHeaderSize + 4, WrittenBytes());
   ASSERT_EQ(BigString("foo", n), Read());
@@ -492,7 +483,7 @@ TEST(LogTest, SkipIntoMultiRecord) {
   // If initial_offset points to a record after first(R1) but before first(R2)
   // incomplete fragment errors are not actual errors, and must be suppressed
   // until a new first or full record is encountered.
-  Write(BigString("foo", 3*kBlockSize));
+  Write(BigString("foo", 3 * kBlockSize));
   Write("correct");
   StartReadingAt(kBlockSize);
 
@@ -514,44 +505,30 @@ TEST(LogTest, ErrorJoinsRecords) {
   Write("correct");
 
   // Wipe the middle block
-  for (int offset = kBlockSize; offset < 2*kBlockSize; offset++) {
+  for (int offset = kBlockSize; offset < 2 * kBlockSize; offset++) {
     SetByte(offset, 'x');
   }
 
   ASSERT_EQ("correct", Read());
   ASSERT_EQ("EOF", Read());
   const size_t dropped = DroppedBytes();
-  ASSERT_LE(dropped, 2*kBlockSize + 100);
+  ASSERT_LE(dropped, 2 * kBlockSize + 100);
-  ASSERT_GE(dropped, 2*kBlockSize);
+  ASSERT_GE(dropped, 2 * kBlockSize);
 }
 
-TEST(LogTest, ReadStart) {
+TEST(LogTest, ReadStart) { CheckInitialOffsetRecord(0, 0); }
-  CheckInitialOffsetRecord(0, 0);
-}
 
-TEST(LogTest, ReadSecondOneOff) {
+TEST(LogTest, ReadSecondOneOff) { CheckInitialOffsetRecord(1, 1); }
-  CheckInitialOffsetRecord(1, 1);
-}
 
-TEST(LogTest, ReadSecondTenThousand) {
+TEST(LogTest, ReadSecondTenThousand) { CheckInitialOffsetRecord(10000, 1); }
-  CheckInitialOffsetRecord(10000, 1);
-}
 
-TEST(LogTest, ReadSecondStart) {
+TEST(LogTest, ReadSecondStart) { CheckInitialOffsetRecord(10007, 1); }
-  CheckInitialOffsetRecord(10007, 1);
-}
 
-TEST(LogTest, ReadThirdOneOff) {
+TEST(LogTest, ReadThirdOneOff) { CheckInitialOffsetRecord(10008, 2); }
-  CheckInitialOffsetRecord(10008, 2);
-}
 
-TEST(LogTest, ReadThirdStart) {
+TEST(LogTest, ReadThirdStart) { CheckInitialOffsetRecord(20014, 2); }
-  CheckInitialOffsetRecord(20014, 2);
-}
 
-TEST(LogTest, ReadFourthOneOff) {
+TEST(LogTest, ReadFourthOneOff) { CheckInitialOffsetRecord(20015, 3); }
-  CheckInitialOffsetRecord(20015, 3);
-}
 
 TEST(LogTest, ReadFourthFirstBlockTrailer) {
   CheckInitialOffsetRecord(log::kBlockSize - 4, 3);
@@ -575,17 +552,11 @@ TEST(LogTest, ReadInitialOffsetIntoBlockPadding) {
   CheckInitialOffsetRecord(3 * log::kBlockSize - 3, 5);
 }
 
-TEST(LogTest, ReadEnd) {
+TEST(LogTest, ReadEnd) { CheckOffsetPastEndReturnsNoRecords(0); }
-  CheckOffsetPastEndReturnsNoRecords(0);
-}
 
-TEST(LogTest, ReadPastEnd) {
+TEST(LogTest, ReadPastEnd) { CheckOffsetPastEndReturnsNoRecords(5); }
-  CheckOffsetPastEndReturnsNoRecords(5);
-}
 
 }  // namespace log
 }  // namespace leveldb
 
-int main(int argc, char** argv) {
+int main(int argc, char** argv) { return leveldb::test::RunAllTests(); }
-  return leveldb::test::RunAllTests();
-}

db/log_writer.cc

@@ -5,6 +5,7 @@
 #include "db/log_writer.h"
 
 #include <stdint.h>
+
 #include "leveldb/env.h"
 #include "util/coding.h"
 #include "util/crc32c.h"
@@ -19,9 +20,7 @@ static void InitTypeCrc(uint32_t* type_crc) {
   }
 }
 
-Writer::Writer(WritableFile* dest)
+Writer::Writer(WritableFile* dest) : dest_(dest), block_offset_(0) {
-    : dest_(dest),
-      block_offset_(0) {
   InitTypeCrc(type_crc_);
 }
 
@@ -30,8 +29,7 @@ Writer::Writer(WritableFile* dest, uint64_t dest_length)
   InitTypeCrc(type_crc_);
 }
 
-Writer::~Writer() {
+Writer::~Writer() = default;
-}
 
 Status Writer::AddRecord(const Slice& slice) {
   const char* ptr = slice.data();
@@ -49,7 +47,7 @@ Status Writer::AddRecord(const Slice& slice) {
       // Switch to a new block
       if (leftover > 0) {
         // Fill the trailer (literal below relies on kHeaderSize being 7)
-        assert(kHeaderSize == 7);
+        static_assert(kHeaderSize == 7, "");
         dest_->Append(Slice("\x00\x00\x00\x00\x00\x00", leftover));
       }
       block_offset_ = 0;
@@ -81,30 +79,31 @@ Status Writer::AddRecord(const Slice& slice) {
   return s;
 }
 
-Status Writer::EmitPhysicalRecord(RecordType t, const char* ptr, size_t n) {
+Status Writer::EmitPhysicalRecord(RecordType t, const char* ptr,
-  assert(n <= 0xffff);  // Must fit in two bytes
+                                  size_t length) {
-  assert(block_offset_ + kHeaderSize + n <= kBlockSize);
+  assert(length <= 0xffff);  // Must fit in two bytes
+  assert(block_offset_ + kHeaderSize + length <= kBlockSize);
 
   // Format the header
   char buf[kHeaderSize];
-  buf[4] = static_cast<char>(n & 0xff);
+  buf[4] = static_cast<char>(length & 0xff);
-  buf[5] = static_cast<char>(n >> 8);
+  buf[5] = static_cast<char>(length >> 8);
   buf[6] = static_cast<char>(t);
 
   // Compute the crc of the record type and the payload.
-  uint32_t crc = crc32c::Extend(type_crc_[t], ptr, n);
+  uint32_t crc = crc32c::Extend(type_crc_[t], ptr, length);
   crc = crc32c::Mask(crc);  // Adjust for storage
   EncodeFixed32(buf, crc);
 
   // Write the header and the payload
   Status s = dest_->Append(Slice(buf, kHeaderSize));
   if (s.ok()) {
-    s = dest_->Append(Slice(ptr, n));
+    s = dest_->Append(Slice(ptr, length));
     if (s.ok()) {
       s = dest_->Flush();
     }
   }
-  block_offset_ += kHeaderSize + n;
+  block_offset_ += kHeaderSize + length;
   return s;
 }
 

db/log_writer.h

@@ -6,6 +6,7 @@
 #define STORAGE_LEVELDB_DB_LOG_WRITER_H_
 
 #include <stdint.h>
+
 #include "db/log_format.h"
 #include "leveldb/slice.h"
 #include "leveldb/status.h"
@@ -28,11 +29,16 @@ class Writer {
   // "*dest" must remain live while this Writer is in use.
   Writer(WritableFile* dest, uint64_t dest_length);
 
+  Writer(const Writer&) = delete;
+  Writer& operator=(const Writer&) = delete;
+
   ~Writer();
 
   Status AddRecord(const Slice& slice);
 
  private:
+  Status EmitPhysicalRecord(RecordType type, const char* ptr, size_t length);
+
   WritableFile* dest_;
   int block_offset_;  // Current offset in block
 
@@ -40,12 +46,6 @@ class Writer {
   // pre-computed to reduce the overhead of computing the crc of the
   // record type stored in the header.
   uint32_t type_crc_[kMaxRecordType + 1];
-
-  Status EmitPhysicalRecord(RecordType type, const char* ptr, size_t length);
-
-  // No copying allowed
-  Writer(const Writer&);
-  void operator=(const Writer&);
 };
 
 }  // namespace log

db/memtable.cc

@@ -18,20 +18,15 @@ static Slice GetLengthPrefixedSlice(const char* data) {
   return Slice(p, len);
 }
 
-MemTable::MemTable(const InternalKeyComparator& cmp)
+MemTable::MemTable(const InternalKeyComparator& comparator)
-    : comparator_(cmp),
+    : comparator_(comparator), refs_(0), table_(comparator_, &arena_) {}
-      refs_(0),
-      table_(comparator_, &arena_) {
-}
 
-MemTable::~MemTable() {
+MemTable::~MemTable() { assert(refs_ == 0); }
-  assert(refs_ == 0);
-}
 
 size_t MemTable::ApproximateMemoryUsage() { return arena_.MemoryUsage(); }
 
-int MemTable::KeyComparator::operator()(const char* aptr, const char* bptr)
+int MemTable::KeyComparator::operator()(const char* aptr,
-    const {
+                                        const char* bptr) const {
   // Internal keys are encoded as length-prefixed strings.
   Slice a = GetLengthPrefixedSlice(aptr);
   Slice b = GetLengthPrefixedSlice(bptr);
@@ -48,39 +43,37 @@ static const char* EncodeKey(std::string* scratch, const Slice& target) {
   return scratch->data();
 }
 
-class MemTableIterator: public Iterator {
+class MemTableIterator : public Iterator {
  public:
-  explicit MemTableIterator(MemTable::Table* table) : iter_(table) { }
+  explicit MemTableIterator(MemTable::Table* table) : iter_(table) {}
 
-  virtual bool Valid() const { return iter_.Valid(); }
+  MemTableIterator(const MemTableIterator&) = delete;
-  virtual void Seek(const Slice& k) { iter_.Seek(EncodeKey(&tmp_, k)); }
+  MemTableIterator& operator=(const MemTableIterator&) = delete;
-  virtual void SeekToFirst() { iter_.SeekToFirst(); }
+
-  virtual void SeekToLast() { iter_.SeekToLast(); }
+  ~MemTableIterator() override = default;
-  virtual void Next() { iter_.Next(); }
+
-  virtual void Prev() { iter_.Prev(); }
+  bool Valid() const override { return iter_.Valid(); }
-  virtual Slice key() const { return GetLengthPrefixedSlice(iter_.key()); }
+  void Seek(const Slice& k) override { iter_.Seek(EncodeKey(&tmp_, k)); }
-  virtual Slice value() const {
+  void SeekToFirst() override { iter_.SeekToFirst(); }
+  void SeekToLast() override { iter_.SeekToLast(); }
+  void Next() override { iter_.Next(); }
+  void Prev() override { iter_.Prev(); }
+  Slice key() const override { return GetLengthPrefixedSlice(iter_.key()); }
+  Slice value() const override {
     Slice key_slice = GetLengthPrefixedSlice(iter_.key());
     return GetLengthPrefixedSlice(key_slice.data() + key_slice.size());
   }
 
-  virtual Status status() const { return Status::OK(); }
+  Status status() const override { return Status::OK(); }
 
  private:
   MemTable::Table::Iterator iter_;
   std::string tmp_;  // For passing to EncodeKey
-
-  // No copying allowed
-  MemTableIterator(const MemTableIterator&);
-  void operator=(const MemTableIterator&);
 };
 
-Iterator* MemTable::NewIterator() {
+Iterator* MemTable::NewIterator() { return new MemTableIterator(&table_); }
-  return new MemTableIterator(&table_);
-}
 
-void MemTable::Add(SequenceNumber s, ValueType type,
+void MemTable::Add(SequenceNumber s, ValueType type, const Slice& key,
-                   const Slice& key,
                    const Slice& value) {
   // Format of an entry is concatenation of:
   //  key_size     : varint32 of internal_key.size()
@@ -90,9 +83,9 @@ void MemTable::Add(SequenceNumber s, ValueType type,
   size_t key_size = key.size();
   size_t val_size = value.size();
   size_t internal_key_size = key_size + 8;
-  const size_t encoded_len =
+  const size_t encoded_len = VarintLength(internal_key_size) +
-      VarintLength(internal_key_size) + internal_key_size +
+                             internal_key_size + VarintLength(val_size) +
-      VarintLength(val_size) + val_size;
+                             val_size;
   char* buf = arena_.Allocate(encoded_len);
   char* p = EncodeVarint32(buf, internal_key_size);
   memcpy(p, key.data(), key_size);
@@ -121,10 +114,9 @@ bool MemTable::Get(const LookupKey& key, std::string* value, Status* s) {
     // all entries with overly large sequence numbers.
     const char* entry = iter.key();
     uint32_t key_length;
-    const char* key_ptr = GetVarint32Ptr(entry, entry+5, &key_length);
+    const char* key_ptr = GetVarint32Ptr(entry, entry + 5, &key_length);
     if (comparator_.comparator.user_comparator()->Compare(
-            Slice(key_ptr, key_length - 8),
+            Slice(key_ptr, key_length - 8), key.user_key()) == 0) {
-            key.user_key()) == 0) {
       // Correct user key
       const uint64_t tag = DecodeFixed64(key_ptr + key_length - 8);
       switch (static_cast<ValueType>(tag & 0xff)) {

db/memtable.h

@@ -6,15 +6,15 @@
 #define STORAGE_LEVELDB_DB_MEMTABLE_H_
 
 #include <string>
-#include "leveldb/db.h"
+
 #include "db/dbformat.h"
 #include "db/skiplist.h"
+#include "leveldb/db.h"
 #include "util/arena.h"
 
 namespace leveldb {
 
 class InternalKeyComparator;
-class Mutex;
 class MemTableIterator;
 
 class MemTable {
@@ -23,6 +23,9 @@ class MemTable {
   // is zero and the caller must call Ref() at least once.
   explicit MemTable(const InternalKeyComparator& comparator);
 
+  MemTable(const MemTable&) = delete;
+  MemTable& operator=(const MemTable&) = delete;
+
   // Increase reference count.
   void Ref() { ++refs_; }
 
@@ -50,8 +53,7 @@ class MemTable {
   // Add an entry into memtable that maps key to value at the
   // specified sequence number and with the specified type.
   // Typically value will be empty if type==kTypeDeletion.
-  void Add(SequenceNumber seq, ValueType type,
+  void Add(SequenceNumber seq, ValueType type, const Slice& key,
-           const Slice& key,
            const Slice& value);
 
   // If memtable contains a value for key, store it in *value and return true.
@@ -61,26 +63,23 @@ class MemTable {
   bool Get(const LookupKey& key, std::string* value, Status* s);
 
  private:
-  ~MemTable();  // Private since only Unref() should be used to delete it
-
-  struct KeyComparator {
-    const InternalKeyComparator comparator;
-    explicit KeyComparator(const InternalKeyComparator& c) : comparator(c) { }
-    int operator()(const char* a, const char* b) const;
-  };
   friend class MemTableIterator;
   friend class MemTableBackwardIterator;
 
+  struct KeyComparator {
+    const InternalKeyComparator comparator;
+    explicit KeyComparator(const InternalKeyComparator& c) : comparator(c) {}
+    int operator()(const char* a, const char* b) const;
+  };
+
   typedef SkipList<const char*, KeyComparator> Table;
 
+  ~MemTable();  // Private since only Unref() should be used to delete it
+
   KeyComparator comparator_;
   int refs_;
   Arena arena_;
   Table table_;
-
-  // No copying allowed
-  MemTable(const MemTable&);
-  void operator=(const MemTable&);
 };
 
 }  // namespace leveldb

db/recovery_test.cc

@@ -17,7 +17,7 @@ namespace leveldb {
 
 class RecoveryTest {
  public:
-  RecoveryTest() : env_(Env::Default()), db_(NULL) {
+  RecoveryTest() : env_(Env::Default()), db_(nullptr) {
     dbname_ = test::TmpDir() + "/recovery_test";
     DestroyDB(dbname_, Options());
     Open();
@@ -44,22 +44,26 @@ class RecoveryTest {
 
   void Close() {
     delete db_;
-    db_ = NULL;
+    db_ = nullptr;
   }
 
-  void Open(Options* options = NULL) {
+  Status OpenWithStatus(Options* options = nullptr) {
     Close();
     Options opts;
-    if (options != NULL) {
+    if (options != nullptr) {
       opts = *options;
     } else {
       opts.reuse_logs = true;  // TODO(sanjay): test both ways
       opts.create_if_missing = true;
     }
-    if (opts.env == NULL) {
+    if (opts.env == nullptr) {
       opts.env = env_;
     }
-    ASSERT_OK(DB::Open(opts, dbname_, &db_));
+    return DB::Open(opts, dbname_, &db_);
+  }
+
+  void Open(Options* options = nullptr) {
+    ASSERT_OK(OpenWithStatus(options));
     ASSERT_EQ(1, NumLogs());
   }
 
@@ -67,7 +71,7 @@ class RecoveryTest {
     return db_->Put(WriteOptions(), k, v);
   }
 
-  std::string Get(const std::string& k, const Snapshot* snapshot = NULL) {
+  std::string Get(const std::string& k, const Snapshot* snapshot = nullptr) {
     std::string result;
     Status s = db_->Get(ReadOptions(), k, &result);
     if (s.IsNotFound()) {
@@ -82,17 +86,18 @@ class RecoveryTest {
     std::string current;
     ASSERT_OK(ReadFileToString(env_, CurrentFileName(dbname_), &current));
     size_t len = current.size();
-    if (len > 0 && current[len-1] == '\n') {
+    if (len > 0 && current[len - 1] == '\n') {
       current.resize(len - 1);
     }
     return dbname_ + "/" + current;
   }
 
-  std::string LogName(uint64_t number) {
+  std::string LogName(uint64_t number) { return LogFileName(dbname_, number); }
-    return LogFileName(dbname_, number);
-  }
 
   size_t DeleteLogFiles() {
+    // Linux allows unlinking open files, but Windows does not.
+    // Closing the db allows for file deletion.
+    Close();
     std::vector<uint64_t> logs = GetFiles(kLogFile);
     for (size_t i = 0; i < logs.size(); i++) {
       ASSERT_OK(env_->DeleteFile(LogName(logs[i]))) << LogName(logs[i]);
@@ -100,9 +105,9 @@ class RecoveryTest {
     return logs.size();
   }
 
-  uint64_t FirstLogFile() {
+  void DeleteManifestFile() { ASSERT_OK(env_->DeleteFile(ManifestFileName())); }
-    return GetFiles(kLogFile)[0];
+
-  }
+  uint64_t FirstLogFile() { return GetFiles(kLogFile)[0]; }
 
   std::vector<uint64_t> GetFiles(FileType t) {
     std::vector<std::string> filenames;
@@ -118,13 +123,9 @@ class RecoveryTest {
     return result;
   }
 
-  int NumLogs() {
+  int NumLogs() { return GetFiles(kLogFile).size(); }
-    return GetFiles(kLogFile).size();
-  }
 
-  int NumTables() {
+  int NumTables() { return GetFiles(kTableFile).size(); }
-    return GetFiles(kTableFile).size();
-  }
 
   uint64_t FileSize(const std::string& fname) {
     uint64_t result;
@@ -132,9 +133,7 @@ class RecoveryTest {
     return result;
   }
 
-  void CompactMemTable() {
+  void CompactMemTable() { dbfull()->TEST_CompactMemTable(); }
-    dbfull()->TEST_CompactMemTable();
-  }
 
   // Directly construct a log file that sets key to val.
   void MakeLogFile(uint64_t lognum, SequenceNumber seq, Slice key, Slice val) {
@@ -186,7 +185,7 @@ TEST(RecoveryTest, LargeManifestCompacted) {
     uint64_t len = FileSize(old_manifest);
     WritableFile* file;
     ASSERT_OK(env()->NewAppendableFile(old_manifest, &file));
-    std::string zeroes(3*1048576 - static_cast<size_t>(len), 0);
+    std::string zeroes(3 * 1048576 - static_cast<size_t>(len), 0);
     ASSERT_OK(file->Append(zeroes));
     ASSERT_OK(file->Flush());
     delete file;
@@ -259,7 +258,7 @@ TEST(RecoveryTest, MultipleMemTables) {
   // Force creation of multiple memtables by reducing the write buffer size.
   Options opt;
   opt.reuse_logs = true;
-  opt.write_buffer_size = (kNum*100) / 2;
+  opt.write_buffer_size = (kNum * 100) / 2;
   Open(&opt);
   ASSERT_LE(2, NumTables());
   ASSERT_EQ(1, NumLogs());
@@ -278,16 +277,16 @@ TEST(RecoveryTest, MultipleLogFiles) {
 
   // Make a bunch of uncompacted log files.
   uint64_t old_log = FirstLogFile();
-  MakeLogFile(old_log+1, 1000, "hello", "world");
+  MakeLogFile(old_log + 1, 1000, "hello", "world");
-  MakeLogFile(old_log+2, 1001, "hi", "there");
+  MakeLogFile(old_log + 2, 1001, "hi", "there");
-  MakeLogFile(old_log+3, 1002, "foo", "bar2");
+  MakeLogFile(old_log + 3, 1002, "foo", "bar2");
 
   // Recover and check that all log files were processed.
   Open();
   ASSERT_LE(1, NumTables());
   ASSERT_EQ(1, NumLogs());
   uint64_t new_log = FirstLogFile();
-  ASSERT_LE(old_log+3, new_log);
+  ASSERT_LE(old_log + 3, new_log);
   ASSERT_EQ("bar2", Get("foo"));
   ASSERT_EQ("world", Get("hello"));
   ASSERT_EQ("there", Get("hi"));
@@ -305,7 +304,7 @@ TEST(RecoveryTest, MultipleLogFiles) {
 
   // Check that introducing an older log file does not cause it to be re-read.
   Close();
-  MakeLogFile(old_log+1, 2000, "hello", "stale write");
+  MakeLogFile(old_log + 1, 2000, "hello", "stale write");
   Open();
   ASSERT_LE(1, NumTables());
   ASSERT_EQ(1, NumLogs());
@@ -317,8 +316,15 @@ TEST(RecoveryTest, MultipleLogFiles) {
   ASSERT_EQ("there", Get("hi"));
 }
 
+TEST(RecoveryTest, ManifestMissing) {
+  ASSERT_OK(Put("foo", "bar"));
+  Close();
+  DeleteManifestFile();
+
+  Status status = OpenWithStatus();
+  ASSERT_TRUE(status.IsCorruption());
+}
+
 }  // namespace leveldb
 
-int main(int argc, char** argv) {
+int main(int argc, char** argv) { return leveldb::test::RunAllTests(); }
-  return leveldb::test::RunAllTests();
-}

db/repair.cc

@@ -54,7 +54,7 @@ class Repairer {
         owns_cache_(options_.block_cache != options.block_cache),
         next_file_number_(1) {
     // TableCache can be small since we expect each table to be opened once.
-    table_cache_ = new TableCache(dbname_, &options_, 10);
+    table_cache_ = new TableCache(dbname_, options_, 10);
   }
 
   ~Repairer() {
@@ -84,9 +84,7 @@ class Repairer {
           "recovered %d files; %llu bytes. "
           "Some data may have been lost. "
           "****",
-          dbname_.c_str(),
+          dbname_.c_str(), static_cast<int>(tables_.size()), bytes);
-          static_cast<int>(tables_.size()),
-          bytes);
     }
     return status;
   }
@@ -97,22 +95,6 @@ class Repairer {
     SequenceNumber max_sequence;
   };
 
-  std::string const dbname_;
-  Env* const env_;
-  InternalKeyComparator const icmp_;
-  InternalFilterPolicy const ipolicy_;
-  Options const options_;
-  bool owns_info_log_;
-  bool owns_cache_;
-  TableCache* table_cache_;
-  VersionEdit edit_;
-
-  std::vector<std::string> manifests_;
-  std::vector<uint64_t> table_numbers_;
-  std::vector<uint64_t> logs_;
-  std::vector<TableInfo> tables_;
-  uint64_t next_file_number_;
-
   Status FindFiles() {
     std::vector<std::string> filenames;
     Status status = env_->GetChildren(dbname_, &filenames);
@@ -152,8 +134,7 @@ class Repairer {
       Status status = ConvertLogToTable(logs_[i]);
       if (!status.ok()) {
         Log(options_.info_log, "Log #%llu: ignoring conversion error: %s",
-            (unsigned long long) logs_[i],
+            (unsigned long long)logs_[i], status.ToString().c_str());
-            status.ToString().c_str());
       }
       ArchiveFile(logname);
     }
@@ -164,11 +145,10 @@ class Repairer {
       Env* env;
       Logger* info_log;
       uint64_t lognum;
-      virtual void Corruption(size_t bytes, const Status& s) {
+      void Corruption(size_t bytes, const Status& s) override {
         // We print error messages for corruption, but continue repairing.
         Log(info_log, "Log #%llu: dropping %d bytes; %s",
-            (unsigned long long) lognum,
+            (unsigned long long)lognum, static_cast<int>(bytes),
-            static_cast<int>(bytes),
             s.ToString().c_str());
       }
     };
@@ -190,8 +170,8 @@ class Repairer {
     // corruptions cause entire commits to be skipped instead of
     // propagating bad information (like overly large sequence
     // numbers).
-    log::Reader reader(lfile, &reporter, false/*do not checksum*/,
+    log::Reader reader(lfile, &reporter, false /*do not checksum*/,
-                       0/*initial_offset*/);
+                       0 /*initial_offset*/);
 
     // Read all the records and add to a memtable
     std::string scratch;
@@ -202,8 +182,8 @@ class Repairer {
     int counter = 0;
     while (reader.ReadRecord(&record, &scratch)) {
       if (record.size() < 12) {
-        reporter.Corruption(
+        reporter.Corruption(record.size(),
-            record.size(), Status::Corruption("log record too small", logname));
+                            Status::Corruption("log record too small", logname));
         continue;
       }
       WriteBatchInternal::SetContents(&batch, record);
@@ -212,8 +192,7 @@ class Repairer {
         counter += WriteBatchInternal::Count(&batch);
       } else {
         Log(options_.info_log, "Log #%llu: ignoring %s",
-            (unsigned long long) log,
+            (unsigned long long)log, status.ToString().c_str());
-            status.ToString().c_str());
         status = Status::OK();  // Keep going with rest of file
       }
     }
@@ -227,16 +206,14 @@ class Repairer {
     status = BuildTable(dbname_, env_, options_, table_cache_, iter, &meta);
     delete iter;
     mem->Unref();
-    mem = NULL;
+    mem = nullptr;
     if (status.ok()) {
       if (meta.file_size > 0) {
         table_numbers_.push_back(meta.number);
       }
     }
     Log(options_.info_log, "Log #%llu: %d ops saved to Table #%llu %s",
-        (unsigned long long) log,
+        (unsigned long long)log, counter, (unsigned long long)meta.number,
-        counter,
-        (unsigned long long) meta.number,
         status.ToString().c_str());
     return status;
   }
@@ -272,8 +249,7 @@ class Repairer {
       ArchiveFile(TableFileName(dbname_, number));
       ArchiveFile(SSTTableFileName(dbname_, number));
       Log(options_.info_log, "Table #%llu: dropped: %s",
-          (unsigned long long) t.meta.number,
+          (unsigned long long)t.meta.number, status.ToString().c_str());
-          status.ToString().c_str());
       return;
     }
 
@@ -287,8 +263,7 @@ class Repairer {
       Slice key = iter->key();
       if (!ParseInternalKey(key, &parsed)) {
         Log(options_.info_log, "Table #%llu: unparsable key %s",
-            (unsigned long long) t.meta.number,
+            (unsigned long long)t.meta.number, EscapeString(key).c_str());
-            EscapeString(key).c_str());
         continue;
       }
 
@@ -307,9 +282,7 @@ class Repairer {
     }
     delete iter;
     Log(options_.info_log, "Table #%llu: %d entries %s",
-        (unsigned long long) t.meta.number,
+        (unsigned long long)t.meta.number, counter, status.ToString().c_str());
-        counter,
-        status.ToString().c_str());
 
     if (status.ok()) {
       tables_.push_back(t);
@@ -350,20 +323,20 @@ class Repairer {
       }
     }
     delete builder;
-    builder = NULL;
+    builder = nullptr;
 
     if (s.ok()) {
       s = file->Close();
     }
     delete file;
-    file = NULL;
+    file = nullptr;
 
     if (counter > 0 && s.ok()) {
       std::string orig = TableFileName(dbname_, t.meta.number);
       s = env_->RenameFile(copy, orig);
       if (s.ok()) {
         Log(options_.info_log, "Table #%llu: %d entries repaired",
-            (unsigned long long) t.meta.number, counter);
+            (unsigned long long)t.meta.number, counter);
         tables_.push_back(t);
       }
     }
@@ -395,11 +368,11 @@ class Repairer {
     for (size_t i = 0; i < tables_.size(); i++) {
       // TODO(opt): separate out into multiple levels
       const TableInfo& t = tables_[i];
-      edit_.AddFile(0, t.meta.number, t.meta.file_size,
+      edit_.AddFile(0, t.meta.number, t.meta.file_size, t.meta.smallest,
-                    t.meta.smallest, t.meta.largest);
+                    t.meta.largest);
     }
 
-    //fprintf(stderr, "NewDescriptor:\n%s\n", edit_.DebugString().c_str());
+    // fprintf(stderr, "NewDescriptor:\n%s\n", edit_.DebugString().c_str());
     {
       log::Writer log(file);
       std::string record;
@@ -410,7 +383,7 @@ class Repairer {
       status = file->Close();
     }
     delete file;
-    file = NULL;
+    file = nullptr;
 
     if (!status.ok()) {
       env_->DeleteFile(tmp);
@@ -438,18 +411,34 @@ class Repairer {
     //    dir/lost/foo
     const char* slash = strrchr(fname.c_str(), '/');
     std::string new_dir;
-    if (slash != NULL) {
+    if (slash != nullptr) {
       new_dir.assign(fname.data(), slash - fname.data());
     }
     new_dir.append("/lost");
     env_->CreateDir(new_dir);  // Ignore error
     std::string new_file = new_dir;
     new_file.append("/");
-    new_file.append((slash == NULL) ? fname.c_str() : slash + 1);
+    new_file.append((slash == nullptr) ? fname.c_str() : slash + 1);
     Status s = env_->RenameFile(fname, new_file);
-    Log(options_.info_log, "Archiving %s: %s\n",
+    Log(options_.info_log, "Archiving %s: %s\n", fname.c_str(),
-        fname.c_str(), s.ToString().c_str());
+        s.ToString().c_str());
   }
+
+  const std::string dbname_;
+  Env* const env_;
+  InternalKeyComparator const icmp_;
+  InternalFilterPolicy const ipolicy_;
+  const Options options_;
+  bool owns_info_log_;
+  bool owns_cache_;
+  TableCache* table_cache_;
+  VersionEdit edit_;
+
+  std::vector<std::string> manifests_;
+  std::vector<uint64_t> table_numbers_;
+  std::vector<uint64_t> logs_;
+  std::vector<TableInfo> tables_;
+  uint64_t next_file_number_;
 };
 }  // namespace
 

db/skiplist.h

@@ -27,9 +27,10 @@
 //
 // ... prev vs. next pointer ordering ...
 
-#include <assert.h>
+#include <atomic>
-#include <stdlib.h>
+#include <cassert>
-#include "port/port.h"
+#include <cstdlib>
+
 #include "util/arena.h"
 #include "util/random.h"
 
@@ -37,7 +38,7 @@ namespace leveldb {
 
 class Arena;
 
-template<typename Key, class Comparator>
+template <typename Key, class Comparator>
 class SkipList {
  private:
   struct Node;
@@ -48,6 +49,9 @@ class SkipList {
   // must remain allocated for the lifetime of the skiplist object.
   explicit SkipList(Comparator cmp, Arena* arena);
 
+  SkipList(const SkipList&) = delete;
+  SkipList& operator=(const SkipList&) = delete;
+
   // Insert key into the list.
   // REQUIRES: nothing that compares equal to key is currently in the list.
   void Insert(const Key& key);
@@ -97,24 +101,10 @@ class SkipList {
  private:
   enum { kMaxHeight = 12 };
 
-  // Immutable after construction
-  Comparator const compare_;
-  Arena* const arena_;    // Arena used for allocations of nodes
-
-  Node* const head_;
-
-  // Modified only by Insert().  Read racily by readers, but stale
-  // values are ok.
-  port::AtomicPointer max_height_;   // Height of the entire list
-
   inline int GetMaxHeight() const {
-    return static_cast<int>(
+    return max_height_.load(std::memory_order_relaxed);
-        reinterpret_cast<intptr_t>(max_height_.NoBarrier_Load()));
   }
 
-  // Read/written only by Insert().
-  Random rnd_;
-
   Node* NewNode(const Key& key, int height);
   int RandomHeight();
   bool Equal(const Key& a, const Key& b) const { return (compare_(a, b) == 0); }
@@ -123,9 +113,9 @@ class SkipList {
   bool KeyIsAfterNode(const Key& key, Node* n) const;
 
   // Return the earliest node that comes at or after key.
-  // Return NULL if there is no such node.
+  // Return nullptr if there is no such node.
   //
-  // If prev is non-NULL, fills prev[level] with pointer to previous
+  // If prev is non-null, fills prev[level] with pointer to previous
   // node at "level" for every level in [0..max_height_-1].
   Node* FindGreaterOrEqual(const Key& key, Node** prev) const;
 
@@ -137,15 +127,24 @@ class SkipList {
   // Return head_ if list is empty.
   Node* FindLast() const;
 
-  // No copying allowed
+  // Immutable after construction
-  SkipList(const SkipList&);
+  Comparator const compare_;
-  void operator=(const SkipList&);
+  Arena* const arena_;  // Arena used for allocations of nodes
+
+  Node* const head_;
+
+  // Modified only by Insert().  Read racily by readers, but stale
+  // values are ok.
+  std::atomic<int> max_height_;  // Height of the entire list
+
+  // Read/written only by Insert().
+  Random rnd_;
 };
 
 // Implementation details follow
-template<typename Key, class Comparator>
+template <typename Key, class Comparator>
-struct SkipList<Key,Comparator>::Node {
+struct SkipList<Key, Comparator>::Node {
-  explicit Node(const Key& k) : key(k) { }
+  explicit Node(const Key& k) : key(k) {}
 
   Key const key;
 
@@ -155,92 +154,92 @@ struct SkipList<Key,Comparator>::Node {
     assert(n >= 0);
     // Use an 'acquire load' so that we observe a fully initialized
     // version of the returned Node.
-    return reinterpret_cast<Node*>(next_[n].Acquire_Load());
+    return next_[n].load(std::memory_order_acquire);
   }
   void SetNext(int n, Node* x) {
     assert(n >= 0);
     // Use a 'release store' so that anybody who reads through this
     // pointer observes a fully initialized version of the inserted node.
-    next_[n].Release_Store(x);
+    next_[n].store(x, std::memory_order_release);
   }
 
   // No-barrier variants that can be safely used in a few locations.
   Node* NoBarrier_Next(int n) {
     assert(n >= 0);
-    return reinterpret_cast<Node*>(next_[n].NoBarrier_Load());
+    return next_[n].load(std::memory_order_relaxed);
   }
   void NoBarrier_SetNext(int n, Node* x) {
     assert(n >= 0);
-    next_[n].NoBarrier_Store(x);
+    next_[n].store(x, std::memory_order_relaxed);
   }
 
  private:
   // Array of length equal to the node height.  next_[0] is lowest level link.
-  port::AtomicPointer next_[1];
+  std::atomic<Node*> next_[1];
 };
 
-template<typename Key, class Comparator>
+template <typename Key, class Comparator>
-typename SkipList<Key,Comparator>::Node*
+typename SkipList<Key, Comparator>::Node* SkipList<Key, Comparator>::NewNode(
-SkipList<Key,Comparator>::NewNode(const Key& key, int height) {
+    const Key& key, int height) {
-  char* mem = arena_->AllocateAligned(
+  char* const node_memory = arena_->AllocateAligned(
-      sizeof(Node) + sizeof(port::AtomicPointer) * (height - 1));
+      sizeof(Node) + sizeof(std::atomic<Node*>) * (height - 1));
-  return new (mem) Node(key);
+  return new (node_memory) Node(key);
 }
 
-template<typename Key, class Comparator>
+template <typename Key, class Comparator>
-inline SkipList<Key,Comparator>::Iterator::Iterator(const SkipList* list) {
+inline SkipList<Key, Comparator>::Iterator::Iterator(const SkipList* list) {
   list_ = list;
-  node_ = NULL;
+  node_ = nullptr;
 }
 
-template<typename Key, class Comparator>
+template <typename Key, class Comparator>
-inline bool SkipList<Key,Comparator>::Iterator::Valid() const {
+inline bool SkipList<Key, Comparator>::Iterator::Valid() const {
-  return node_ != NULL;
+  return node_ != nullptr;
 }
 
-template<typename Key, class Comparator>
+template <typename Key, class Comparator>
-inline const Key& SkipList<Key,Comparator>::Iterator::key() const {
+inline const Key& SkipList<Key, Comparator>::Iterator::key() const {
   assert(Valid());
   return node_->key;
 }
 
-template<typename Key, class Comparator>
+template <typename Key, class Comparator>
-inline void SkipList<Key,Comparator>::Iterator::Next() {
+inline void SkipList<Key, Comparator>::Iterator::Next() {
   assert(Valid());
   node_ = node_->Next(0);
 }
 
-template<typename Key, class Comparator>
+template <typename Key, class Comparator>
-inline void SkipList<Key,Comparator>::Iterator::Prev() {
+inline void SkipList<Key, Comparator>::Iterator::Prev() {
   // Instead of using explicit "prev" links, we just search for the
   // last node that falls before key.
   assert(Valid());
   node_ = list_->FindLessThan(node_->key);
   if (node_ == list_->head_) {
-    node_ = NULL;
+    node_ = nullptr;
   }
 }
 
-template<typename Key, class Comparator>
+template <typename Key, class Comparator>
-inline void SkipList<Key,Comparator>::Iterator::Seek(const Key& target) {
+inline void SkipList<Key, Comparator>::Iterator::Seek(const Key& target) {
-  node_ = list_->FindGreaterOrEqual(target, NULL);
+  node_ = list_->FindGreaterOrEqual(target, nullptr);
 }
 
-template<typename Key, class Comparator>
+template <typename Key, class Comparator>
-inline void SkipList<Key,Comparator>::Iterator::SeekToFirst() {
+inline void SkipList<Key, Comparator>::Iterator::SeekToFirst() {
   node_ = list_->head_->Next(0);
 }
 
-template<typename Key, class Comparator>
+template <typename Key, class Comparator>
-inline void SkipList<Key,Comparator>::Iterator::SeekToLast() {
+inline void SkipList<Key, Comparator>::Iterator::SeekToLast() {
   node_ = list_->FindLast();
   if (node_ == list_->head_) {
-    node_ = NULL;
+    node_ = nullptr;
   }
 }
 
-template<typename Key, class Comparator>
+template <typename Key, class Comparator>
-int SkipList<Key,Comparator>::RandomHeight() {
+int SkipList<Key, Comparator>::RandomHeight() {
   // Increase height with probability 1 in kBranching
   static const unsigned int kBranching = 4;
   int height = 1;
@@ -252,15 +251,16 @@ int SkipList<Key,Comparator>::RandomHeight() {
   return height;
 }
 
-template<typename Key, class Comparator>
+template <typename Key, class Comparator>
-bool SkipList<Key,Comparator>::KeyIsAfterNode(const Key& key, Node* n) const {
+bool SkipList<Key, Comparator>::KeyIsAfterNode(const Key& key, Node* n) const {
-  // NULL n is considered infinite
+  // null n is considered infinite
-  return (n != NULL) && (compare_(n->key, key) < 0);
+  return (n != nullptr) && (compare_(n->key, key) < 0);
 }
 
-template<typename Key, class Comparator>
+template <typename Key, class Comparator>
-typename SkipList<Key,Comparator>::Node* SkipList<Key,Comparator>::FindGreaterOrEqual(const Key& key, Node** prev)
+typename SkipList<Key, Comparator>::Node*
-    const {
+SkipList<Key, Comparator>::FindGreaterOrEqual(const Key& key,
+                                              Node** prev) const {
   Node* x = head_;
   int level = GetMaxHeight() - 1;
   while (true) {
@@ -269,7 +269,7 @@ typename SkipList<Key,Comparator>::Node* SkipList<Key,Comparator>::FindGreaterOr
       // Keep searching in this list
       x = next;
     } else {
-      if (prev != NULL) prev[level] = x;
+      if (prev != nullptr) prev[level] = x;
       if (level == 0) {
         return next;
       } else {
@@ -280,15 +280,15 @@ typename SkipList<Key,Comparator>::Node* SkipList<Key,Comparator>::FindGreaterOr
   }
 }
 
-template<typename Key, class Comparator>
+template <typename Key, class Comparator>
-typename SkipList<Key,Comparator>::Node*
+typename SkipList<Key, Comparator>::Node*
-SkipList<Key,Comparator>::FindLessThan(const Key& key) const {
+SkipList<Key, Comparator>::FindLessThan(const Key& key) const {
   Node* x = head_;
   int level = GetMaxHeight() - 1;
   while (true) {
     assert(x == head_ || compare_(x->key, key) < 0);
     Node* next = x->Next(level);
-    if (next == NULL || compare_(next->key, key) >= 0) {
+    if (next == nullptr || compare_(next->key, key) >= 0) {
       if (level == 0) {
         return x;
       } else {
@@ -301,14 +301,14 @@ SkipList<Key,Comparator>::FindLessThan(const Key& key) const {
   }
 }
 
-template<typename Key, class Comparator>
+template <typename Key, class Comparator>
-typename SkipList<Key,Comparator>::Node* SkipList<Key,Comparator>::FindLast()
+typename SkipList<Key, Comparator>::Node* SkipList<Key, Comparator>::FindLast()
     const {
   Node* x = head_;
   int level = GetMaxHeight() - 1;
   while (true) {
     Node* next = x->Next(level);
-    if (next == NULL) {
+    if (next == nullptr) {
       if (level == 0) {
         return x;
       } else {
@@ -321,43 +321,41 @@ typename SkipList<Key,Comparator>::Node* SkipList<Key,Comparator>::FindLast()
   }
 }
 
-template<typename Key, class Comparator>
+template <typename Key, class Comparator>
-SkipList<Key,Comparator>::SkipList(Comparator cmp, Arena* arena)
+SkipList<Key, Comparator>::SkipList(Comparator cmp, Arena* arena)
     : compare_(cmp),
       arena_(arena),
       head_(NewNode(0 /* any key will do */, kMaxHeight)),
-      max_height_(reinterpret_cast<void*>(1)),
+      max_height_(1),
       rnd_(0xdeadbeef) {
   for (int i = 0; i < kMaxHeight; i++) {
-    head_->SetNext(i, NULL);
+    head_->SetNext(i, nullptr);
   }
 }
 
-template<typename Key, class Comparator>
+template <typename Key, class Comparator>
-void SkipList<Key,Comparator>::Insert(const Key& key) {
+void SkipList<Key, Comparator>::Insert(const Key& key) {
   // TODO(opt): We can use a barrier-free variant of FindGreaterOrEqual()
   // here since Insert() is externally synchronized.
   Node* prev[kMaxHeight];
   Node* x = FindGreaterOrEqual(key, prev);
 
   // Our data structure does not allow duplicate insertion
-  assert(x == NULL || !Equal(key, x->key));
+  assert(x == nullptr || !Equal(key, x->key));
 
   int height = RandomHeight();
   if (height > GetMaxHeight()) {
     for (int i = GetMaxHeight(); i < height; i++) {
       prev[i] = head_;
     }
-    //fprintf(stderr, "Change height from %d to %d\n", max_height_, height);
-
     // It is ok to mutate max_height_ without any synchronization
     // with concurrent readers.  A concurrent reader that observes
     // the new value of max_height_ will see either the old value of
-    // new level pointers from head_ (NULL), or a new value set in
+    // new level pointers from head_ (nullptr), or a new value set in
     // the loop below.  In the former case the reader will
-    // immediately drop to the next level since NULL sorts after all
+    // immediately drop to the next level since nullptr sorts after all
     // keys.  In the latter case the reader will use the new node.
-    max_height_.NoBarrier_Store(reinterpret_cast<void*>(height));
+    max_height_.store(height, std::memory_order_relaxed);
   }
 
   x = NewNode(key, height);
@@ -369,10 +367,10 @@ void SkipList<Key,Comparator>::Insert(const Key& key) {
   }
 }
 
-template<typename Key, class Comparator>
+template <typename Key, class Comparator>
-bool SkipList<Key,Comparator>::Contains(const Key& key) const {
+bool SkipList<Key, Comparator>::Contains(const Key& key) const {
-  Node* x = FindGreaterOrEqual(key, NULL);
+  Node* x = FindGreaterOrEqual(key, nullptr);
-  if (x != NULL && Equal(key, x->key)) {
+  if (x != nullptr && Equal(key, x->key)) {
     return true;
   } else {
     return false;

db/skiplist_test.cc

@@ -3,8 +3,13 @@
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 
 #include "db/skiplist.h"
+
+#include <atomic>
 #include <set>
+
 #include "leveldb/env.h"
+#include "port/port.h"
+#include "port/thread_annotations.h"
 #include "util/arena.h"
 #include "util/hash.h"
 #include "util/random.h"
@@ -26,7 +31,7 @@ struct Comparator {
   }
 };
 
-class SkipTest { };
+class SkipTest {};
 
 TEST(SkipTest, Empty) {
   Arena arena;
@@ -112,8 +117,7 @@ TEST(SkipTest, InsertAndLookup) {
 
     // Compare against model iterator
     for (std::set<Key>::reverse_iterator model_iter = keys.rbegin();
-         model_iter != keys.rend();
+         model_iter != keys.rend(); ++model_iter) {
-         ++model_iter) {
       ASSERT_TRUE(iter.Valid());
       ASSERT_EQ(*model_iter, iter.key());
       iter.Prev();
@@ -126,7 +130,7 @@ TEST(SkipTest, InsertAndLookup) {
 // concurrent readers (with no synchronization other than when a
 // reader's iterator is created), the reader always observes all the
 // data that was present in the skip list when the iterator was
-// constructor.  Because insertions are happening concurrently, we may
+// constructed.  Because insertions are happening concurrently, we may
 // also observe new values that were inserted since the iterator was
 // constructed, but we should never miss any values that were present
 // at iterator construction time.
@@ -155,12 +159,12 @@ class ConcurrentTest {
   static uint64_t hash(Key key) { return key & 0xff; }
 
   static uint64_t HashNumbers(uint64_t k, uint64_t g) {
-    uint64_t data[2] = { k, g };
+    uint64_t data[2] = {k, g};
     return Hash(reinterpret_cast<char*>(data), sizeof(data), 0);
   }
 
   static Key MakeKey(uint64_t k, uint64_t g) {
-    assert(sizeof(Key) == sizeof(uint64_t));
+    static_assert(sizeof(Key) == sizeof(uint64_t), "");
     assert(k <= K);  // We sometimes pass K to seek to the end of the skiplist
     assert(g <= 0xffffffffu);
     return ((k << 40) | (g << 8) | (HashNumbers(k, g) & 0xff));
@@ -186,13 +190,11 @@ class ConcurrentTest {
 
   // Per-key generation
   struct State {
-    port::AtomicPointer generation[K];
+    std::atomic<int> generation[K];
-    void Set(int k, intptr_t v) {
+    void Set(int k, int v) {
-      generation[k].Release_Store(reinterpret_cast<void*>(v));
+      generation[k].store(v, std::memory_order_release);
-    }
-    intptr_t Get(int k) {
-      return reinterpret_cast<intptr_t>(generation[k].Acquire_Load());
     }
+    int Get(int k) { return generation[k].load(std::memory_order_acquire); }
 
     State() {
       for (int k = 0; k < K; k++) {
@@ -211,7 +213,7 @@ class ConcurrentTest {
   SkipList<Key, Comparator> list_;
 
  public:
-  ConcurrentTest() : list_(Comparator(), &arena_) { }
+  ConcurrentTest() : list_(Comparator(), &arena_) {}
 
   // REQUIRES: External synchronization
   void WriteStep(Random* rnd) {
@@ -250,11 +252,9 @@ class ConcurrentTest {
         // Note that generation 0 is never inserted, so it is ok if
         // <*,0,*> is missing.
         ASSERT_TRUE((gen(pos) == 0) ||
-                    (gen(pos) > static_cast<Key>(initial_state.Get(key(pos))))
+                    (gen(pos) > static_cast<Key>(initial_state.Get(key(pos)))))
-                    ) << "key: " << key(pos)
+            << "key: " << key(pos) << "; gen: " << gen(pos)
-                      << "; gen: " << gen(pos)
+            << "; initgen: " << initial_state.Get(key(pos));
-                      << "; initgen: "
-                      << initial_state.Get(key(pos));
 
         // Advance to next key in the valid key space
         if (key(pos) < key(current)) {
@@ -298,21 +298,14 @@ class TestState {
  public:
   ConcurrentTest t_;
   int seed_;
-  port::AtomicPointer quit_flag_;
+  std::atomic<bool> quit_flag_;
 
-  enum ReaderState {
+  enum ReaderState { STARTING, RUNNING, DONE };
-    STARTING,
-    RUNNING,
-    DONE
-  };
 
   explicit TestState(int s)
-      : seed_(s),
+      : seed_(s), quit_flag_(false), state_(STARTING), state_cv_(&mu_) {}
-        quit_flag_(NULL),
-        state_(STARTING),
-        state_cv_(&mu_) {}
 
-  void Wait(ReaderState s) {
+  void Wait(ReaderState s) LOCKS_EXCLUDED(mu_) {
     mu_.Lock();
     while (state_ != s) {
       state_cv_.Wait();
@@ -320,7 +313,7 @@ class TestState {
     mu_.Unlock();
   }
 
-  void Change(ReaderState s) {
+  void Change(ReaderState s) LOCKS_EXCLUDED(mu_) {
     mu_.Lock();
     state_ = s;
     state_cv_.Signal();
@@ -329,8 +322,8 @@ class TestState {
 
  private:
   port::Mutex mu_;
-  ReaderState state_;
+  ReaderState state_ GUARDED_BY(mu_);
-  port::CondVar state_cv_;
+  port::CondVar state_cv_ GUARDED_BY(mu_);
 };
 
 static void ConcurrentReader(void* arg) {
@@ -338,7 +331,7 @@ static void ConcurrentReader(void* arg) {
   Random rnd(state->seed_);
   int64_t reads = 0;
   state->Change(TestState::RUNNING);
-  while (!state->quit_flag_.Acquire_Load()) {
+  while (!state->quit_flag_.load(std::memory_order_acquire)) {
     state->t_.ReadStep(&rnd);
     ++reads;
   }
@@ -360,7 +353,7 @@ static void RunConcurrent(int run) {
     for (int i = 0; i < kSize; i++) {
       state.t_.WriteStep(&rnd);
     }
-    state.quit_flag_.Release_Store(&state);  // Any non-NULL arg will do
+    state.quit_flag_.store(true, std::memory_order_release);
     state.Wait(TestState::DONE);
   }
 }
@@ -373,6 +366,4 @@ TEST(SkipTest, Concurrent5) { RunConcurrent(5); }
 
 }  // namespace leveldb
 
-int main(int argc, char** argv) {
+int main(int argc, char** argv) { return leveldb::test::RunAllTests(); }
-  return leveldb::test::RunAllTests();
-}

db/snapshot.h

@@ -16,50 +16,78 @@ class SnapshotList;
 // Each SnapshotImpl corresponds to a particular sequence number.
 class SnapshotImpl : public Snapshot {
  public:
-  SequenceNumber number_;  // const after creation
+  SnapshotImpl(SequenceNumber sequence_number)
+      : sequence_number_(sequence_number) {}
+
+  SequenceNumber sequence_number() const { return sequence_number_; }
 
  private:
   friend class SnapshotList;
 
-  // SnapshotImpl is kept in a doubly-linked circular list
+  // SnapshotImpl is kept in a doubly-linked circular list. The SnapshotList
+  // implementation operates on the next/previous fields direcly.
   SnapshotImpl* prev_;
   SnapshotImpl* next_;
 
-  SnapshotList* list_;                 // just for sanity checks
+  const SequenceNumber sequence_number_;
+
+#if !defined(NDEBUG)
+  SnapshotList* list_ = nullptr;
+#endif  // !defined(NDEBUG)
 };
 
 class SnapshotList {
  public:
-  SnapshotList() {
+  SnapshotList() : head_(0) {
-    list_.prev_ = &list_;
+    head_.prev_ = &head_;
-    list_.next_ = &list_;
+    head_.next_ = &head_;
   }
 
-  bool empty() const { return list_.next_ == &list_; }
+  bool empty() const { return head_.next_ == &head_; }
-  SnapshotImpl* oldest() const { assert(!empty()); return list_.next_; }
+  SnapshotImpl* oldest() const {
-  SnapshotImpl* newest() const { assert(!empty()); return list_.prev_; }
+    assert(!empty());
-
+    return head_.next_;
-  const SnapshotImpl* New(SequenceNumber seq) {
+  }
-    SnapshotImpl* s = new SnapshotImpl;
+  SnapshotImpl* newest() const {
-    s->number_ = seq;
+    assert(!empty());
-    s->list_ = this;
+    return head_.prev_;
-    s->next_ = &list_;
-    s->prev_ = list_.prev_;
-    s->prev_->next_ = s;
-    s->next_->prev_ = s;
-    return s;
   }
 
-  void Delete(const SnapshotImpl* s) {
+  // Creates a SnapshotImpl and appends it to the end of the list.
-    assert(s->list_ == this);
+  SnapshotImpl* New(SequenceNumber sequence_number) {
-    s->prev_->next_ = s->next_;
+    assert(empty() || newest()->sequence_number_ <= sequence_number);
-    s->next_->prev_ = s->prev_;
+
-    delete s;
+    SnapshotImpl* snapshot = new SnapshotImpl(sequence_number);
+
+#if !defined(NDEBUG)
+    snapshot->list_ = this;
+#endif  // !defined(NDEBUG)
+    snapshot->next_ = &head_;
+    snapshot->prev_ = head_.prev_;
+    snapshot->prev_->next_ = snapshot;
+    snapshot->next_->prev_ = snapshot;
+    return snapshot;
+  }
+
+  // Removes a SnapshotImpl from this list.
+  //
+  // The snapshot must have been created by calling New() on this list.
+  //
+  // The snapshot pointer should not be const, because its memory is
+  // deallocated. However, that would force us to change DB::ReleaseSnapshot(),
+  // which is in the API, and currently takes a const Snapshot.
+  void Delete(const SnapshotImpl* snapshot) {
+#if !defined(NDEBUG)
+    assert(snapshot->list_ == this);
+#endif  // !defined(NDEBUG)
+    snapshot->prev_->next_ = snapshot->next_;
+    snapshot->next_->prev_ = snapshot->prev_;
+    delete snapshot;
   }
 
  private:
   // Dummy head of doubly-linked list of snapshots
-  SnapshotImpl list_;
+  SnapshotImpl head_;
 };
 
 }  // namespace leveldb

db/table_cache.cc

@@ -29,18 +29,14 @@ static void UnrefEntry(void* arg1, void* arg2) {
   cache->Release(h);
 }
 
-TableCache::TableCache(const std::string& dbname,
+TableCache::TableCache(const std::string& dbname, const Options& options,
-                       const Options* options,
                        int entries)
-    : env_(options->env),
+    : env_(options.env),
       dbname_(dbname),
       options_(options),
-      cache_(NewLRUCache(entries)) {
+      cache_(NewLRUCache(entries)) {}
-}
 
-TableCache::~TableCache() {
+TableCache::~TableCache() { delete cache_; }
-  delete cache_;
-}
 
 Status TableCache::FindTable(uint64_t file_number, uint64_t file_size,
                              Cache::Handle** handle) {
@@ -49,10 +45,10 @@ Status TableCache::FindTable(uint64_t file_number, uint64_t file_size,
   EncodeFixed64(buf, file_number);
   Slice key(buf, sizeof(buf));
   *handle = cache_->Lookup(key);
-  if (*handle == NULL) {
+  if (*handle == nullptr) {
     std::string fname = TableFileName(dbname_, file_number);
-    RandomAccessFile* file = NULL;
+    RandomAccessFile* file = nullptr;
-    Table* table = NULL;
+    Table* table = nullptr;
     s = env_->NewRandomAccessFile(fname, &file);
     if (!s.ok()) {
       std::string old_fname = SSTTableFileName(dbname_, file_number);
@@ -61,11 +57,11 @@ Status TableCache::FindTable(uint64_t file_number, uint64_t file_size,
       }
     }
     if (s.ok()) {
-      s = Table::Open(*options_, file, file_size, &table);
+      s = Table::Open(options_, file, file_size, &table);
     }
 
     if (!s.ok()) {
-      assert(table == NULL);
+      assert(table == nullptr);
       delete file;
       // We do not cache error results so that if the error is transient,
       // or somebody repairs the file, we recover automatically.
@@ -80,14 +76,13 @@ Status TableCache::FindTable(uint64_t file_number, uint64_t file_size,
 }
 
 Iterator* TableCache::NewIterator(const ReadOptions& options,
-                                  uint64_t file_number,
+                                  uint64_t file_number, uint64_t file_size,
-                                  uint64_t file_size,
                                   Table** tableptr) {
-  if (tableptr != NULL) {
+  if (tableptr != nullptr) {
-    *tableptr = NULL;
+    *tableptr = nullptr;
   }
 
-  Cache::Handle* handle = NULL;
+  Cache::Handle* handle = nullptr;
   Status s = FindTable(file_number, file_size, &handle);
   if (!s.ok()) {
     return NewErrorIterator(s);
@@ -96,23 +91,21 @@ Iterator* TableCache::NewIterator(const ReadOptions& options,
   Table* table = reinterpret_cast<TableAndFile*>(cache_->Value(handle))->table;
   Iterator* result = table->NewIterator(options);
   result->RegisterCleanup(&UnrefEntry, cache_, handle);
-  if (tableptr != NULL) {
+  if (tableptr != nullptr) {
     *tableptr = table;
   }
   return result;
 }
 
-Status TableCache::Get(const ReadOptions& options,
+Status TableCache::Get(const ReadOptions& options, uint64_t file_number,
-                       uint64_t file_number,
+                       uint64_t file_size, const Slice& k, void* arg,
-                       uint64_t file_size,
+                       void (*handle_result)(void*, const Slice&,
-                       const Slice& k,
+                                             const Slice&)) {
-                       void* arg,
+  Cache::Handle* handle = nullptr;
-                       void (*saver)(void*, const Slice&, const Slice&)) {
-  Cache::Handle* handle = NULL;
   Status s = FindTable(file_number, file_size, &handle);
   if (s.ok()) {
     Table* t = reinterpret_cast<TableAndFile*>(cache_->Value(handle))->table;
-    s = t->InternalGet(options, k, arg, saver);
+    s = t->InternalGet(options, k, arg, handle_result);
     cache_->Release(handle);
   }
   return s;

db/table_cache.h

@@ -7,8 +7,10 @@
 #ifndef STORAGE_LEVELDB_DB_TABLE_CACHE_H_
 #define STORAGE_LEVELDB_DB_TABLE_CACHE_H_
 
-#include <string>
 #include <stdint.h>
+
+#include <string>
+
 #include "db/dbformat.h"
 #include "leveldb/cache.h"
 #include "leveldb/table.h"
@@ -20,40 +22,35 @@ class Env;
 
 class TableCache {
  public:
-  TableCache(const std::string& dbname, const Options* options, int entries);
+  TableCache(const std::string& dbname, const Options& options, int entries);
   ~TableCache();
 
   // Return an iterator for the specified file number (the corresponding
   // file length must be exactly "file_size" bytes).  If "tableptr" is
-  // non-NULL, also sets "*tableptr" to point to the Table object
+  // non-null, also sets "*tableptr" to point to the Table object
-  // underlying the returned iterator, or NULL if no Table object underlies
+  // underlying the returned iterator, or to nullptr if no Table object
-  // the returned iterator.  The returned "*tableptr" object is owned by
+  // underlies the returned iterator.  The returned "*tableptr" object is owned
-  // the cache and should not be deleted, and is valid for as long as the
+  // by the cache and should not be deleted, and is valid for as long as the
   // returned iterator is live.
-  Iterator* NewIterator(const ReadOptions& options,
+  Iterator* NewIterator(const ReadOptions& options, uint64_t file_number,
-                        uint64_t file_number,
+                        uint64_t file_size, Table** tableptr = nullptr);
-                        uint64_t file_size,
-                        Table** tableptr = NULL);
 
   // If a seek to internal key "k" in specified file finds an entry,
   // call (*handle_result)(arg, found_key, found_value).
-  Status Get(const ReadOptions& options,
+  Status Get(const ReadOptions& options, uint64_t file_number,
-             uint64_t file_number,
+             uint64_t file_size, const Slice& k, void* arg,
-             uint64_t file_size,
-             const Slice& k,
-             void* arg,
              void (*handle_result)(void*, const Slice&, const Slice&));
 
   // Evict any entry for the specified file number
   void Evict(uint64_t file_number);
 
  private:
+  Status FindTable(uint64_t file_number, uint64_t file_size, Cache::Handle**);
+
   Env* const env_;
   const std::string dbname_;
-  const Options* options_;
+  const Options& options_;
   Cache* cache_;
-
-  Status FindTable(uint64_t file_number, uint64_t file_size, Cache::Handle**);
 };
 
 }  // namespace leveldb

db/version_edit.cc

@@ -66,12 +66,10 @@ void VersionEdit::EncodeTo(std::string* dst) const {
     PutLengthPrefixedSlice(dst, compact_pointers_[i].second.Encode());
   }
 
-  for (DeletedFileSet::const_iterator iter = deleted_files_.begin();
+  for (const auto& deleted_file_kvp : deleted_files_) {
-       iter != deleted_files_.end();
-       ++iter) {
     PutVarint32(dst, kDeletedFile);
-    PutVarint32(dst, iter->first);   // level
+    PutVarint32(dst, deleted_file_kvp.first);   // level
-    PutVarint64(dst, iter->second);  // file number
+    PutVarint64(dst, deleted_file_kvp.second);  // file number
   }
 
   for (size_t i = 0; i < new_files_.size(); i++) {
@@ -88,8 +86,7 @@ void VersionEdit::EncodeTo(std::string* dst) const {
 static bool GetInternalKey(Slice* input, InternalKey* dst) {
   Slice str;
   if (GetLengthPrefixedSlice(input, &str)) {
-    dst->DecodeFrom(str);
+    return dst->DecodeFrom(str);
-    return true;
   } else {
     return false;
   }
@@ -97,8 +94,7 @@ static bool GetInternalKey(Slice* input, InternalKey* dst) {
 
 static bool GetLevel(Slice* input, int* level) {
   uint32_t v;
-  if (GetVarint32(input, &v) &&
+  if (GetVarint32(input, &v) && v < config::kNumLevels) {
-      v < config::kNumLevels) {
     *level = v;
     return true;
   } else {
@@ -109,7 +105,7 @@ static bool GetLevel(Slice* input, int* level) {
 Status VersionEdit::DecodeFrom(const Slice& src) {
   Clear();
   Slice input = src;
-  const char* msg = NULL;
+  const char* msg = nullptr;
   uint32_t tag;
 
   // Temporary storage for parsing
@@ -119,7 +115,7 @@ Status VersionEdit::DecodeFrom(const Slice& src) {
   Slice str;
   InternalKey key;
 
-  while (msg == NULL && GetVarint32(&input, &tag)) {
+  while (msg == nullptr && GetVarint32(&input, &tag)) {
     switch (tag) {
       case kComparator:
         if (GetLengthPrefixedSlice(&input, &str)) {
@@ -163,8 +159,7 @@ Status VersionEdit::DecodeFrom(const Slice& src) {
         break;
 
       case kCompactPointer:
-        if (GetLevel(&input, &level) &&
+        if (GetLevel(&input, &level) && GetInternalKey(&input, &key)) {
-            GetInternalKey(&input, &key)) {
           compact_pointers_.push_back(std::make_pair(level, key));
         } else {
           msg = "compaction pointer";
@@ -172,8 +167,7 @@ Status VersionEdit::DecodeFrom(const Slice& src) {
         break;
 
       case kDeletedFile:
-        if (GetLevel(&input, &level) &&
+        if (GetLevel(&input, &level) && GetVarint64(&input, &number)) {
-            GetVarint64(&input, &number)) {
           deleted_files_.insert(std::make_pair(level, number));
         } else {
           msg = "deleted file";
@@ -181,8 +175,7 @@ Status VersionEdit::DecodeFrom(const Slice& src) {
         break;
 
       case kNewFile:
-        if (GetLevel(&input, &level) &&
+        if (GetLevel(&input, &level) && GetVarint64(&input, &f.number) &&
-            GetVarint64(&input, &f.number) &&
             GetVarint64(&input, &f.file_size) &&
             GetInternalKey(&input, &f.smallest) &&
             GetInternalKey(&input, &f.largest)) {
@@ -198,12 +191,12 @@ Status VersionEdit::DecodeFrom(const Slice& src) {
     }
   }
 
-  if (msg == NULL && !input.empty()) {
+  if (msg == nullptr && !input.empty()) {
     msg = "invalid tag";
   }
 
   Status result;
-  if (msg != NULL) {
+  if (msg != nullptr) {
     result = Status::Corruption("VersionEdit", msg);
   }
   return result;
@@ -238,13 +231,11 @@ std::string VersionEdit::DebugString() const {
     r.append(" ");
     r.append(compact_pointers_[i].second.DebugString());
   }
-  for (DeletedFileSet::const_iterator iter = deleted_files_.begin();
+  for (const auto& deleted_files_kvp : deleted_files_) {
-       iter != deleted_files_.end();
-       ++iter) {
     r.append("\n  DeleteFile: ");
-    AppendNumberTo(&r, iter->first);
+    AppendNumberTo(&r, deleted_files_kvp.first);
     r.append(" ");
-    AppendNumberTo(&r, iter->second);
+    AppendNumberTo(&r, deleted_files_kvp.second);
   }
   for (size_t i = 0; i < new_files_.size(); i++) {
     const FileMetaData& f = new_files_[i].second;

db/version_edit.h

@@ -8,6 +8,7 @@
 #include <set>
 #include <utility>
 #include <vector>
+
 #include "db/dbformat.h"
 
 namespace leveldb {
@@ -15,20 +16,20 @@ namespace leveldb {
 class VersionSet;
 
 struct FileMetaData {
+  FileMetaData() : refs(0), allowed_seeks(1 << 30), file_size(0) {}
+
   int refs;
   int allowed_seeks;  // Seeks allowed until compaction
   uint64_t number;
   uint64_t file_size;    // File size in bytes
   InternalKey smallest;  // Smallest internal key served by table
   InternalKey largest;   // Largest internal key served by table
-
-  FileMetaData() : refs(0), allowed_seeks(1 << 30), file_size(0) { }
 };
 
 class VersionEdit {
  public:
   VersionEdit() { Clear(); }
-  ~VersionEdit() { }
+  ~VersionEdit() = default;
 
   void Clear();
 
@@ -59,10 +60,8 @@ class VersionEdit {
   // Add the specified file at the specified number.
   // REQUIRES: This version has not been saved (see VersionSet::SaveTo)
   // REQUIRES: "smallest" and "largest" are smallest and largest keys in file
-  void AddFile(int level, uint64_t file,
+  void AddFile(int level, uint64_t file, uint64_t file_size,
-               uint64_t file_size,
+               const InternalKey& smallest, const InternalKey& largest) {
-               const InternalKey& smallest,
-               const InternalKey& largest) {
     FileMetaData f;
     f.number = file;
     f.file_size = file_size;
@@ -84,7 +83,7 @@ class VersionEdit {
  private:
   friend class VersionSet;
 
-  typedef std::set< std::pair<int, uint64_t> > DeletedFileSet;
+  typedef std::set<std::pair<int, uint64_t>> DeletedFileSet;
 
   std::string comparator_;
   uint64_t log_number_;
@@ -97,9 +96,9 @@ class VersionEdit {
   bool has_next_file_number_;
   bool has_last_sequence_;
 
-  std::vector< std::pair<int, InternalKey> > compact_pointers_;
+  std::vector<std::pair<int, InternalKey>> compact_pointers_;
   DeletedFileSet deleted_files_;
-  std::vector< std::pair<int, FileMetaData> > new_files_;
+  std::vector<std::pair<int, FileMetaData>> new_files_;
 };
 
 }  // namespace leveldb

db/version_edit_test.cc

@@ -17,7 +17,7 @@ static void TestEncodeDecode(const VersionEdit& edit) {
   ASSERT_EQ(encoded, encoded2);
 }
 
-class VersionEditTest { };
+class VersionEditTest {};
 
 TEST(VersionEditTest, EncodeDecode) {
   static const uint64_t kBig = 1ull << 50;
@@ -41,6 +41,4 @@ TEST(VersionEditTest, EncodeDecode) {
 
 }  // namespace leveldb
 
-int main(int argc, char** argv) {
+int main(int argc, char** argv) { return leveldb::test::RunAllTests(); }
-  return leveldb::test::RunAllTests();
-}

db/version_set.cc

@@ -4,8 +4,10 @@
 
 #include "db/version_set.h"
 
-#include <algorithm>
 #include <stdio.h>
+
+#include <algorithm>
+
 #include "db/filename.h"
 #include "db/log_reader.h"
 #include "db/log_writer.h"
@@ -84,8 +86,7 @@ Version::~Version() {
 }
 
 int FindFile(const InternalKeyComparator& icmp,
-             const std::vector<FileMetaData*>& files,
+             const std::vector<FileMetaData*>& files, const Slice& key) {
-             const Slice& key) {
   uint32_t left = 0;
   uint32_t right = files.size();
   while (left < right) {
@@ -104,22 +105,21 @@ int FindFile(const InternalKeyComparator& icmp,
   return right;
 }
 
-static bool AfterFile(const Comparator* ucmp,
+static bool AfterFile(const Comparator* ucmp, const Slice* user_key,
-                      const Slice* user_key, const FileMetaData* f) {
+                      const FileMetaData* f) {
-  // NULL user_key occurs before all keys and is therefore never after *f
+  // null user_key occurs before all keys and is therefore never after *f
-  return (user_key != NULL &&
+  return (user_key != nullptr &&
           ucmp->Compare(*user_key, f->largest.user_key()) > 0);
 }
 
-static bool BeforeFile(const Comparator* ucmp,
+static bool BeforeFile(const Comparator* ucmp, const Slice* user_key,
-                       const Slice* user_key, const FileMetaData* f) {
+                       const FileMetaData* f) {
-  // NULL user_key occurs after all keys and is therefore never before *f
+  // null user_key occurs after all keys and is therefore never before *f
-  return (user_key != NULL &&
+  return (user_key != nullptr &&
           ucmp->Compare(*user_key, f->smallest.user_key()) < 0);
 }
 
-bool SomeFileOverlapsRange(
+bool SomeFileOverlapsRange(const InternalKeyComparator& icmp,
-    const InternalKeyComparator& icmp,
                            bool disjoint_sorted_files,
                            const std::vector<FileMetaData*>& files,
                            const Slice* smallest_user_key,
@@ -141,10 +141,11 @@ bool SomeFileOverlapsRange(
 
   // Binary search over file list
   uint32_t index = 0;
-  if (smallest_user_key != NULL) {
+  if (smallest_user_key != nullptr) {
     // Find the earliest possible internal key for smallest_user_key
-    InternalKey small(*smallest_user_key, kMaxSequenceNumber,kValueTypeForSeek);
+    InternalKey small_key(*smallest_user_key, kMaxSequenceNumber,
-    index = FindFile(icmp, files, small.Encode());
+                          kValueTypeForSeek);
+    index = FindFile(icmp, files, small_key.Encode());
   }
 
   if (index >= files.size()) {
@@ -164,25 +165,21 @@ class Version::LevelFileNumIterator : public Iterator {
  public:
   LevelFileNumIterator(const InternalKeyComparator& icmp,
                        const std::vector<FileMetaData*>* flist)
-      : icmp_(icmp),
+      : icmp_(icmp), flist_(flist), index_(flist->size()) {  // Marks as invalid
-        flist_(flist),
-        index_(flist->size()) {        // Marks as invalid
   }
-  virtual bool Valid() const {
+  bool Valid() const override { return index_ < flist_->size(); }
-    return index_ < flist_->size();
+  void Seek(const Slice& target) override {
-  }
-  virtual void Seek(const Slice& target) {
     index_ = FindFile(icmp_, *flist_, target);
   }
-  virtual void SeekToFirst() { index_ = 0; }
+  void SeekToFirst() override { index_ = 0; }
-  virtual void SeekToLast() {
+  void SeekToLast() override {
     index_ = flist_->empty() ? 0 : flist_->size() - 1;
   }
-  virtual void Next() {
+  void Next() override {
     assert(Valid());
     index_++;
   }
-  virtual void Prev() {
+  void Prev() override {
     assert(Valid());
     if (index_ == 0) {
       index_ = flist_->size();  // Marks as invalid
@@ -190,17 +187,18 @@ class Version::LevelFileNumIterator : public Iterator {
       index_--;
     }
   }
-  Slice key() const {
+  Slice key() const override {
     assert(Valid());
     return (*flist_)[index_]->largest.Encode();
   }
-  Slice value() const {
+  Slice value() const override {
     assert(Valid());
     EncodeFixed64(value_buf_, (*flist_)[index_]->number);
-    EncodeFixed64(value_buf_+8, (*flist_)[index_]->file_size);
+    EncodeFixed64(value_buf_ + 8, (*flist_)[index_]->file_size);
     return Slice(value_buf_, sizeof(value_buf_));
   }
-  virtual Status status() const { return Status::OK(); }
+  Status status() const override { return Status::OK(); }
+
  private:
   const InternalKeyComparator icmp_;
   const std::vector<FileMetaData*>* const flist_;
@@ -210,16 +208,14 @@ class Version::LevelFileNumIterator : public Iterator {
   mutable char value_buf_[16];
 };
 
-static Iterator* GetFileIterator(void* arg,
+static Iterator* GetFileIterator(void* arg, const ReadOptions& options,
-                                 const ReadOptions& options,
                                  const Slice& file_value) {
   TableCache* cache = reinterpret_cast<TableCache*>(arg);
   if (file_value.size() != 16) {
     return NewErrorIterator(
         Status::Corruption("FileReader invoked with unexpected value"));
   } else {
-    return cache->NewIterator(options,
+    return cache->NewIterator(options, DecodeFixed64(file_value.data()),
-                              DecodeFixed64(file_value.data()),
                               DecodeFixed64(file_value.data() + 8));
   }
 }
@@ -227,16 +223,15 @@ static Iterator* GetFileIterator(void* arg,
 Iterator* Version::NewConcatenatingIterator(const ReadOptions& options,
                                             int level) const {
   return NewTwoLevelIterator(
-      new LevelFileNumIterator(vset_->icmp_, &files_[level]),
+      new LevelFileNumIterator(vset_->icmp_, &files_[level]), &GetFileIterator,
-      &GetFileIterator, vset_->table_cache_, options);
+      vset_->table_cache_, options);
 }
 
 void Version::AddIterators(const ReadOptions& options,
                            std::vector<Iterator*>* iters) {
   // Merge all level zero files together since they may overlap
   for (size_t i = 0; i < files_[0].size(); i++) {
-    iters->push_back(
+    iters->push_back(vset_->table_cache_->NewIterator(
-        vset_->table_cache_->NewIterator(
         options, files_[0][i]->number, files_[0][i]->file_size));
   }
 
@@ -264,7 +259,7 @@ struct Saver {
   Slice user_key;
   std::string* value;
 };
-}
+}  // namespace
 static void SaveValue(void* arg, const Slice& ikey, const Slice& v) {
   Saver* s = reinterpret_cast<Saver*>(arg);
   ParsedInternalKey parsed_key;
@@ -284,10 +279,8 @@ static bool NewestFirst(FileMetaData* a, FileMetaData* b) {
   return a->number > b->number;
 }
 
-void Version::ForEachOverlapping(Slice user_key, Slice internal_key,
+void Version::ForEachOverlapping(Slice user_key, Slice internal_key, void* arg,
-                                 void* arg,
                                  bool (*func)(void*, int, FileMetaData*)) {
-  // TODO(sanjay): Change Version::Get() to use this function.
   const Comparator* ucmp = vset_->icmp_.user_comparator();
 
   // Search level-0 in order from newest to oldest.
@@ -329,110 +322,89 @@ void Version::ForEachOverlapping(Slice user_key, Slice internal_key,
   }
 }
 
-Status Version::Get(const ReadOptions& options,
+Status Version::Get(const ReadOptions& options, const LookupKey& k,
-                    const LookupKey& k,
+                    std::string* value, GetStats* stats) {
-                    std::string* value,
+  stats->seek_file = nullptr;
-                    GetStats* stats) {
-  Slice ikey = k.internal_key();
-  Slice user_key = k.user_key();
-  const Comparator* ucmp = vset_->icmp_.user_comparator();
-  Status s;
-
-  stats->seek_file = NULL;
   stats->seek_file_level = -1;
-  FileMetaData* last_file_read = NULL;
-  int last_file_read_level = -1;
-
-  // We can search level-by-level since entries never hop across
-  // levels.  Therefore we are guaranteed that if we find data
-  // in an smaller level, later levels are irrelevant.
-  std::vector<FileMetaData*> tmp;
-  FileMetaData* tmp2;
-  for (int level = 0; level < config::kNumLevels; level++) {
-    size_t num_files = files_[level].size();
-    if (num_files == 0) continue;
-
-    // Get the list of files to search in this level
-    FileMetaData* const* files = &files_[level][0];
-    if (level == 0) {
-      // Level-0 files may overlap each other.  Find all files that
-      // overlap user_key and process them in order from newest to oldest.
-      tmp.reserve(num_files);
-      for (uint32_t i = 0; i < num_files; i++) {
-        FileMetaData* f = files[i];
-        if (ucmp->Compare(user_key, f->smallest.user_key()) >= 0 &&
-            ucmp->Compare(user_key, f->largest.user_key()) <= 0) {
-          tmp.push_back(f);
-        }
-      }
-      if (tmp.empty()) continue;
-
-      std::sort(tmp.begin(), tmp.end(), NewestFirst);
-      files = &tmp[0];
-      num_files = tmp.size();
-    } else {
-      // Binary search to find earliest index whose largest key >= ikey.
-      uint32_t index = FindFile(vset_->icmp_, files_[level], ikey);
-      if (index >= num_files) {
-        files = NULL;
-        num_files = 0;
-      } else {
-        tmp2 = files[index];
-        if (ucmp->Compare(user_key, tmp2->smallest.user_key()) < 0) {
-          // All of "tmp2" is past any data for user_key
-          files = NULL;
-          num_files = 0;
-        } else {
-          files = &tmp2;
-          num_files = 1;
-        }
-      }
-    }
-
-    for (uint32_t i = 0; i < num_files; ++i) {
-      if (last_file_read != NULL && stats->seek_file == NULL) {
-        // We have had more than one seek for this read.  Charge the 1st file.
-        stats->seek_file = last_file_read;
-        stats->seek_file_level = last_file_read_level;
-      }
-
-      FileMetaData* f = files[i];
-      last_file_read = f;
-      last_file_read_level = level;
 
+  struct State {
     Saver saver;
-      saver.state = kNotFound;
+    GetStats* stats;
-      saver.ucmp = ucmp;
+    const ReadOptions* options;
-      saver.user_key = user_key;
+    Slice ikey;
-      saver.value = value;
+    FileMetaData* last_file_read;
-      s = vset_->table_cache_->Get(options, f->number, f->file_size,
+    int last_file_read_level;
-                                   ikey, &saver, SaveValue);
+
-      if (!s.ok()) {
+    VersionSet* vset;
-        return s;
+    Status s;
-      }
+    bool found;
-      switch (saver.state) {
+
-        case kNotFound:
+    static bool Match(void* arg, int level, FileMetaData* f) {
-          break;      // Keep searching in other files
+      State* state = reinterpret_cast<State*>(arg);
-        case kFound:
+
-          return s;
+      if (state->stats->seek_file == nullptr &&
-        case kDeleted:
+          state->last_file_read != nullptr) {
-          s = Status::NotFound(Slice());  // Use empty error message for speed
+        // We have had more than one seek for this read.  Charge the 1st file.
-          return s;
+        state->stats->seek_file = state->last_file_read;
-        case kCorrupt:
+        state->stats->seek_file_level = state->last_file_read_level;
-          s = Status::Corruption("corrupted key for ", user_key);
-          return s;
-      }
-    }
       }
 
-  return Status::NotFound(Slice());  // Use an empty error message for speed
+      state->last_file_read = f;
+      state->last_file_read_level = level;
+
+      state->s = state->vset->table_cache_->Get(*state->options, f->number,
+                                                f->file_size, state->ikey,
+                                                &state->saver, SaveValue);
+      if (!state->s.ok()) {
+        state->found = true;
+        return false;
+      }
+      switch (state->saver.state) {
+        case kNotFound:
+          return true;  // Keep searching in other files
+        case kFound:
+          state->found = true;
+          return false;
+        case kDeleted:
+          return false;
+        case kCorrupt:
+          state->s =
+              Status::Corruption("corrupted key for ", state->saver.user_key);
+          state->found = true;
+          return false;
+      }
+
+      // Not reached. Added to avoid false compilation warnings of
+      // "control reaches end of non-void function".
+      return false;
+    }
+  };
+
+  State state;
+  state.found = false;
+  state.stats = stats;
+  state.last_file_read = nullptr;
+  state.last_file_read_level = -1;
+
+  state.options = &options;
+  state.ikey = k.internal_key();
+  state.vset = vset_;
+
+  state.saver.state = kNotFound;
+  state.saver.ucmp = vset_->icmp_.user_comparator();
+  state.saver.user_key = k.user_key();
+  state.saver.value = value;
+
+  ForEachOverlapping(state.saver.user_key, state.ikey, &state, &State::Match);
+
+  return state.found ? state.s : Status::NotFound(Slice());
 }
 
 bool Version::UpdateStats(const GetStats& stats) {
   FileMetaData* f = stats.seek_file;
-  if (f != NULL) {
+  if (f != nullptr) {
     f->allowed_seeks--;
-    if (f->allowed_seeks <= 0 && file_to_compact_ == NULL) {
+    if (f->allowed_seeks <= 0 && file_to_compact_ == nullptr) {
       file_to_compact_ = f;
       file_to_compact_level_ = stats.seek_file_level;
       return true;
@@ -479,9 +451,7 @@ bool Version::RecordReadSample(Slice internal_key) {
   return false;
 }
 
-void Version::Ref() {
+void Version::Ref() { ++refs_; }
-  ++refs_;
-}
 
 void Version::Unref() {
   assert(this != &vset_->dummy_versions_);
@@ -492,15 +462,13 @@ void Version::Unref() {
   }
 }
 
-bool Version::OverlapInLevel(int level,
+bool Version::OverlapInLevel(int level, const Slice* smallest_user_key,
-                             const Slice* smallest_user_key,
                              const Slice* largest_user_key) {
   return SomeFileOverlapsRange(vset_->icmp_, (level > 0), files_[level],
                                smallest_user_key, largest_user_key);
 }
 
-int Version::PickLevelForMemTableOutput(
+int Version::PickLevelForMemTableOutput(const Slice& smallest_user_key,
-    const Slice& smallest_user_key,
                                         const Slice& largest_user_key) {
   int level = 0;
   if (!OverlapInLevel(0, &smallest_user_key, &largest_user_key)) {
@@ -528,40 +496,39 @@ int Version::PickLevelForMemTableOutput(
 }
 
 // Store in "*inputs" all files in "level" that overlap [begin,end]
-void Version::GetOverlappingInputs(
+void Version::GetOverlappingInputs(int level, const InternalKey* begin,
-    int level,
-    const InternalKey* begin,
                                    const InternalKey* end,
                                    std::vector<FileMetaData*>* inputs) {
   assert(level >= 0);
   assert(level < config::kNumLevels);
   inputs->clear();
   Slice user_begin, user_end;
-  if (begin != NULL) {
+  if (begin != nullptr) {
     user_begin = begin->user_key();
   }
-  if (end != NULL) {
+  if (end != nullptr) {
     user_end = end->user_key();
   }
   const Comparator* user_cmp = vset_->icmp_.user_comparator();
-  for (size_t i = 0; i < files_[level].size(); ) {
+  for (size_t i = 0; i < files_[level].size();) {
     FileMetaData* f = files_[level][i++];
     const Slice file_start = f->smallest.user_key();
     const Slice file_limit = f->largest.user_key();
-    if (begin != NULL && user_cmp->Compare(file_limit, user_begin) < 0) {
+    if (begin != nullptr && user_cmp->Compare(file_limit, user_begin) < 0) {
       // "f" is completely before specified range; skip it
-    } else if (end != NULL && user_cmp->Compare(file_start, user_end) > 0) {
+    } else if (end != nullptr && user_cmp->Compare(file_start, user_end) > 0) {
       // "f" is completely after specified range; skip it
     } else {
       inputs->push_back(f);
       if (level == 0) {
         // Level-0 files may overlap each other.  So check if the newly
         // added file has expanded the range.  If so, restart search.
-        if (begin != NULL && user_cmp->Compare(file_start, user_begin) < 0) {
+        if (begin != nullptr && user_cmp->Compare(file_start, user_begin) < 0) {
           user_begin = file_start;
           inputs->clear();
           i = 0;
-        } else if (end != NULL && user_cmp->Compare(file_limit, user_end) > 0) {
+        } else if (end != nullptr &&
+                   user_cmp->Compare(file_limit, user_end) > 0) {
           user_end = file_limit;
           inputs->clear();
           i = 0;
@@ -629,9 +596,7 @@ class VersionSet::Builder {
 
  public:
   // Initialize a builder with the files from *base and other info from *vset
-  Builder(VersionSet* vset, Version* base)
+  Builder(VersionSet* vset, Version* base) : vset_(vset), base_(base) {
-      : vset_(vset),
-        base_(base) {
     base_->Ref();
     BySmallestKey cmp;
     cmp.internal_comparator = &vset_->icmp_;
@@ -645,8 +610,8 @@ class VersionSet::Builder {
       const FileSet* added = levels_[level].added_files;
       std::vector<FileMetaData*> to_unref;
       to_unref.reserve(added->size());
-      for (FileSet::const_iterator it = added->begin();
+      for (FileSet::const_iterator it = added->begin(); it != added->end();
-          it != added->end(); ++it) {
+           ++it) {
         to_unref.push_back(*it);
       }
       delete added;
@@ -671,12 +636,9 @@ class VersionSet::Builder {
     }
 
     // Delete files
-    const VersionEdit::DeletedFileSet& del = edit->deleted_files_;
+    for (const auto& deleted_file_set_kvp : edit->deleted_files_) {
-    for (VersionEdit::DeletedFileSet::const_iterator iter = del.begin();
+      const int level = deleted_file_set_kvp.first;
-         iter != del.end();
+      const uint64_t number = deleted_file_set_kvp.second;
-         ++iter) {
-      const int level = iter->first;
-      const uint64_t number = iter->second;
       levels_[level].deleted_files.insert(number);
     }
 
@@ -699,7 +661,7 @@ class VersionSet::Builder {
       // same as the compaction of 40KB of data.  We are a little
       // conservative and allow approximately one seek for every 16KB
       // of data before triggering a compaction.
-      f->allowed_seeks = (f->file_size / 16384);
+      f->allowed_seeks = static_cast<int>((f->file_size / 16384U));
       if (f->allowed_seeks < 100) f->allowed_seeks = 100;
 
       levels_[level].deleted_files.erase(f->number);
@@ -717,20 +679,17 @@ class VersionSet::Builder {
       const std::vector<FileMetaData*>& base_files = base_->files_[level];
       std::vector<FileMetaData*>::const_iterator base_iter = base_files.begin();
       std::vector<FileMetaData*>::const_iterator base_end = base_files.end();
-      const FileSet* added = levels_[level].added_files;
+      const FileSet* added_files = levels_[level].added_files;
-      v->files_[level].reserve(base_files.size() + added->size());
+      v->files_[level].reserve(base_files.size() + added_files->size());
-      for (FileSet::const_iterator added_iter = added->begin();
+      for (const auto& added_file : *added_files) {
-           added_iter != added->end();
-           ++added_iter) {
         // Add all smaller files listed in base_
-        for (std::vector<FileMetaData*>::const_iterator bpos
+        for (std::vector<FileMetaData*>::const_iterator bpos =
-                 = std::upper_bound(base_iter, base_end, *added_iter, cmp);
+                 std::upper_bound(base_iter, base_end, added_file, cmp);
-             base_iter != bpos;
+             base_iter != bpos; ++base_iter) {
-             ++base_iter) {
           MaybeAddFile(v, level, *base_iter);
         }
 
-        MaybeAddFile(v, level, *added_iter);
+        MaybeAddFile(v, level, added_file);
       }
 
       // Add remaining base files
@@ -742,7 +701,7 @@ class VersionSet::Builder {
       // Make sure there is no overlap in levels > 0
       if (level > 0) {
         for (uint32_t i = 1; i < v->files_[level].size(); i++) {
-          const InternalKey& prev_end = v->files_[level][i-1]->largest;
+          const InternalKey& prev_end = v->files_[level][i - 1]->largest;
           const InternalKey& this_begin = v->files_[level][i]->smallest;
           if (vset_->icmp_.Compare(prev_end, this_begin) >= 0) {
             fprintf(stderr, "overlapping ranges in same level %s vs. %s\n",
@@ -763,7 +722,7 @@ class VersionSet::Builder {
       std::vector<FileMetaData*>* files = &v->files_[level];
       if (level > 0 && !files->empty()) {
         // Must not overlap
-        assert(vset_->icmp_.Compare((*files)[files->size()-1]->largest,
+        assert(vset_->icmp_.Compare((*files)[files->size() - 1]->largest,
                                     f->smallest) < 0);
       }
       f->refs++;
@@ -772,8 +731,7 @@ class VersionSet::Builder {
   }
 };
 
-VersionSet::VersionSet(const std::string& dbname,
+VersionSet::VersionSet(const std::string& dbname, const Options* options,
-                       const Options* options,
                        TableCache* table_cache,
                        const InternalKeyComparator* cmp)
     : env_(options->env),
@@ -786,10 +744,10 @@ VersionSet::VersionSet(const std::string& dbname,
       last_sequence_(0),
       log_number_(0),
       prev_log_number_(0),
-      descriptor_file_(NULL),
+      descriptor_file_(nullptr),
-      descriptor_log_(NULL),
+      descriptor_log_(nullptr),
       dummy_versions_(this),
-      current_(NULL) {
+      current_(nullptr) {
   AppendVersion(new Version(this));
 }
 
@@ -804,7 +762,7 @@ void VersionSet::AppendVersion(Version* v) {
   // Make "v" current
   assert(v->refs_ == 0);
   assert(v != current_);
-  if (current_ != NULL) {
+  if (current_ != nullptr) {
     current_->Unref();
   }
   current_ = v;
@@ -844,10 +802,10 @@ Status VersionSet::LogAndApply(VersionEdit* edit, port::Mutex* mu) {
   // a temporary file that contains a snapshot of the current version.
   std::string new_manifest_file;
   Status s;
-  if (descriptor_log_ == NULL) {
+  if (descriptor_log_ == nullptr) {
     // No reason to unlock *mu here since we only hit this path in the
     // first call to LogAndApply (when opening the database).
-    assert(descriptor_file_ == NULL);
+    assert(descriptor_file_ == nullptr);
     new_manifest_file = DescriptorFileName(dbname_, manifest_file_number_);
     edit->SetNextFile(next_file_number_);
     s = env_->NewWritableFile(new_manifest_file, &descriptor_file_);
@@ -893,8 +851,8 @@ Status VersionSet::LogAndApply(VersionEdit* edit, port::Mutex* mu) {
     if (!new_manifest_file.empty()) {
       delete descriptor_log_;
       delete descriptor_file_;
-      descriptor_log_ = NULL;
+      descriptor_log_ = nullptr;
-      descriptor_file_ = NULL;
+      descriptor_file_ = nullptr;
       env_->DeleteFile(new_manifest_file);
     }
   }
@@ -902,10 +860,10 @@ Status VersionSet::LogAndApply(VersionEdit* edit, port::Mutex* mu) {
   return s;
 }
 
-Status VersionSet::Recover(bool *save_manifest) {
+Status VersionSet::Recover(bool* save_manifest) {
   struct LogReporter : public log::Reader::Reporter {
     Status* status;
-    virtual void Corruption(size_t bytes, const Status& s) {
+    void Corruption(size_t bytes, const Status& s) override {
       if (this->status->ok()) *this->status = s;
     }
   };
@@ -916,7 +874,7 @@ Status VersionSet::Recover(bool *save_manifest) {
   if (!s.ok()) {
     return s;
   }
-  if (current.empty() || current[current.size()-1] != '\n') {
+  if (current.empty() || current[current.size() - 1] != '\n') {
     return Status::Corruption("CURRENT file does not end with newline");
   }
   current.resize(current.size() - 1);
@@ -925,6 +883,10 @@ Status VersionSet::Recover(bool *save_manifest) {
   SequentialFile* file;
   s = env_->NewSequentialFile(dscname, &file);
   if (!s.ok()) {
+    if (s.IsNotFound()) {
+      return Status::Corruption("CURRENT points to a non-existent file",
+                                s.ToString());
+    }
     return s;
   }
 
@@ -941,7 +903,8 @@ Status VersionSet::Recover(bool *save_manifest) {
   {
     LogReporter reporter;
     reporter.status = &s;
-    log::Reader reader(file, &reporter, true/*checksum*/, 0/*initial_offset*/);
+    log::Reader reader(file, &reporter, true /*checksum*/,
+                       0 /*initial_offset*/);
     Slice record;
     std::string scratch;
     while (reader.ReadRecord(&record, &scratch) && s.ok()) {
@@ -982,7 +945,7 @@ Status VersionSet::Recover(bool *save_manifest) {
     }
   }
   delete file;
-  file = NULL;
+  file = nullptr;
 
   if (s.ok()) {
     if (!have_next_file) {
@@ -1040,12 +1003,12 @@ bool VersionSet::ReuseManifest(const std::string& dscname,
     return false;
   }
 
-  assert(descriptor_file_ == NULL);
+  assert(descriptor_file_ == nullptr);
-  assert(descriptor_log_ == NULL);
+  assert(descriptor_log_ == nullptr);
   Status r = env_->NewAppendableFile(dscname, &descriptor_file_);
   if (!r.ok()) {
     Log(options_->info_log, "Reuse MANIFEST: %s\n", r.ToString().c_str());
-    assert(descriptor_file_ == NULL);
+    assert(descriptor_file_ == nullptr);
     return false;
   }
 
@@ -1066,7 +1029,7 @@ void VersionSet::Finalize(Version* v) {
   int best_level = -1;
   double best_score = -1;
 
-  for (int level = 0; level < config::kNumLevels-1; level++) {
+  for (int level = 0; level < config::kNumLevels - 1; level++) {
     double score;
     if (level == 0) {
       // We treat level-0 specially by bounding the number of files
@@ -1137,16 +1100,12 @@ int VersionSet::NumLevelFiles(int level) const {
 
 const char* VersionSet::LevelSummary(LevelSummaryStorage* scratch) const {
   // Update code if kNumLevels changes
-  assert(config::kNumLevels == 7);
+  static_assert(config::kNumLevels == 7, "");
   snprintf(scratch->buffer, sizeof(scratch->buffer),
-           "files[ %d %d %d %d %d %d %d ]",
+           "files[ %d %d %d %d %d %d %d ]", int(current_->files_[0].size()),
-           int(current_->files_[0].size()),
+           int(current_->files_[1].size()), int(current_->files_[2].size()),
-           int(current_->files_[1].size()),
+           int(current_->files_[3].size()), int(current_->files_[4].size()),
-           int(current_->files_[2].size()),
+           int(current_->files_[5].size()), int(current_->files_[6].size()));
-           int(current_->files_[3].size()),
-           int(current_->files_[4].size()),
-           int(current_->files_[5].size()),
-           int(current_->files_[6].size()));
   return scratch->buffer;
 }
 
@@ -1172,7 +1131,7 @@ uint64_t VersionSet::ApproximateOffsetOf(Version* v, const InternalKey& ikey) {
         Table* tableptr;
         Iterator* iter = table_cache_->NewIterator(
             ReadOptions(), files[i]->number, files[i]->file_size, &tableptr);
-        if (tableptr != NULL) {
+        if (tableptr != nullptr) {
           result += tableptr->ApproximateOffsetOf(ikey.Encode());
         }
         delete iter;
@@ -1183,8 +1142,7 @@ uint64_t VersionSet::ApproximateOffsetOf(Version* v, const InternalKey& ikey) {
 }
 
 void VersionSet::AddLiveFiles(std::set<uint64_t>* live) {
-  for (Version* v = dummy_versions_.next_;
+  for (Version* v = dummy_versions_.next_; v != &dummy_versions_;
-       v != &dummy_versions_;
        v = v->next_) {
     for (int level = 0; level < config::kNumLevels; level++) {
       const std::vector<FileMetaData*>& files = v->files_[level];
@@ -1207,7 +1165,7 @@ int64_t VersionSet::MaxNextLevelOverlappingBytes() {
   for (int level = 1; level < config::kNumLevels - 1; level++) {
     for (size_t i = 0; i < current_->files_[level].size(); i++) {
       const FileMetaData* f = current_->files_[level][i];
-      current_->GetOverlappingInputs(level+1, &f->smallest, &f->largest,
+      current_->GetOverlappingInputs(level + 1, &f->smallest, &f->largest,
                                      &overlaps);
       const int64_t sum = TotalFileSize(overlaps);
       if (sum > result) {
@@ -1222,8 +1180,7 @@ int64_t VersionSet::MaxNextLevelOverlappingBytes() {
 // *smallest, *largest.
 // REQUIRES: inputs is not empty
 void VersionSet::GetRange(const std::vector<FileMetaData*>& inputs,
-                          InternalKey* smallest,
+                          InternalKey* smallest, InternalKey* largest) {
-                          InternalKey* largest) {
   assert(!inputs.empty());
   smallest->Clear();
   largest->Clear();
@@ -1248,8 +1205,7 @@ void VersionSet::GetRange(const std::vector<FileMetaData*>& inputs,
 // REQUIRES: inputs is not empty
 void VersionSet::GetRange2(const std::vector<FileMetaData*>& inputs1,
                            const std::vector<FileMetaData*>& inputs2,
-                           InternalKey* smallest,
+                           InternalKey* smallest, InternalKey* largest) {
-                           InternalKey* largest) {
   std::vector<FileMetaData*> all = inputs1;
   all.insert(all.end(), inputs2.begin(), inputs2.end());
   GetRange(all, smallest, largest);
@@ -1271,8 +1227,8 @@ Iterator* VersionSet::MakeInputIterator(Compaction* c) {
       if (c->level() + which == 0) {
         const std::vector<FileMetaData*>& files = c->inputs_[which];
         for (size_t i = 0; i < files.size(); i++) {
-          list[num++] = table_cache_->NewIterator(
+          list[num++] = table_cache_->NewIterator(options, files[i]->number,
-              options, files[i]->number, files[i]->file_size);
+                                                  files[i]->file_size);
         }
       } else {
         // Create concatenating iterator for the files from this level
@@ -1295,11 +1251,11 @@ Compaction* VersionSet::PickCompaction() {
   // We prefer compactions triggered by too much data in a level over
   // the compactions triggered by seeks.
   const bool size_compaction = (current_->compaction_score_ >= 1);
-  const bool seek_compaction = (current_->file_to_compact_ != NULL);
+  const bool seek_compaction = (current_->file_to_compact_ != nullptr);
   if (size_compaction) {
     level = current_->compaction_level_;
     assert(level >= 0);
-    assert(level+1 < config::kNumLevels);
+    assert(level + 1 < config::kNumLevels);
     c = new Compaction(options_, level);
 
     // Pick the first file that comes after compact_pointer_[level]
@@ -1320,7 +1276,7 @@ Compaction* VersionSet::PickCompaction() {
     c = new Compaction(options_, level);
     c->inputs_[0].push_back(current_->file_to_compact_);
   } else {
-    return NULL;
+    return nullptr;
   }
 
   c->input_version_ = current_;
@@ -1342,12 +1298,94 @@ Compaction* VersionSet::PickCompaction() {
   return c;
 }
 
+// Finds the largest key in a vector of files. Returns true if files it not
+// empty.
+bool FindLargestKey(const InternalKeyComparator& icmp,
+                    const std::vector<FileMetaData*>& files,
+                    InternalKey* largest_key) {
+  if (files.empty()) {
+    return false;
+  }
+  *largest_key = files[0]->largest;
+  for (size_t i = 1; i < files.size(); ++i) {
+    FileMetaData* f = files[i];
+    if (icmp.Compare(f->largest, *largest_key) > 0) {
+      *largest_key = f->largest;
+    }
+  }
+  return true;
+}
+
+// Finds minimum file b2=(l2, u2) in level file for which l2 > u1 and
+// user_key(l2) = user_key(u1)
+FileMetaData* FindSmallestBoundaryFile(
+    const InternalKeyComparator& icmp,
+    const std::vector<FileMetaData*>& level_files,
+    const InternalKey& largest_key) {
+  const Comparator* user_cmp = icmp.user_comparator();
+  FileMetaData* smallest_boundary_file = nullptr;
+  for (size_t i = 0; i < level_files.size(); ++i) {
+    FileMetaData* f = level_files[i];
+    if (icmp.Compare(f->smallest, largest_key) > 0 &&
+        user_cmp->Compare(f->smallest.user_key(), largest_key.user_key()) ==
+            0) {
+      if (smallest_boundary_file == nullptr ||
+          icmp.Compare(f->smallest, smallest_boundary_file->smallest) < 0) {
+        smallest_boundary_file = f;
+      }
+    }
+  }
+  return smallest_boundary_file;
+}
+
+// Extracts the largest file b1 from |compaction_files| and then searches for a
+// b2 in |level_files| for which user_key(u1) = user_key(l2). If it finds such a
+// file b2 (known as a boundary file) it adds it to |compaction_files| and then
+// searches again using this new upper bound.
+//
+// If there are two blocks, b1=(l1, u1) and b2=(l2, u2) and
+// user_key(u1) = user_key(l2), and if we compact b1 but not b2 then a
+// subsequent get operation will yield an incorrect result because it will
+// return the record from b2 in level i rather than from b1 because it searches
+// level by level for records matching the supplied user key.
+//
+// parameters:
+//   in     level_files:      List of files to search for boundary files.
+//   in/out compaction_files: List of files to extend by adding boundary files.
+void AddBoundaryInputs(const InternalKeyComparator& icmp,
+                       const std::vector<FileMetaData*>& level_files,
+                       std::vector<FileMetaData*>* compaction_files) {
+  InternalKey largest_key;
+
+  // Quick return if compaction_files is empty.
+  if (!FindLargestKey(icmp, *compaction_files, &largest_key)) {
+    return;
+  }
+
+  bool continue_searching = true;
+  while (continue_searching) {
+    FileMetaData* smallest_boundary_file =
+        FindSmallestBoundaryFile(icmp, level_files, largest_key);
+
+    // If a boundary file was found advance largest_key, otherwise we're done.
+    if (smallest_boundary_file != NULL) {
+      compaction_files->push_back(smallest_boundary_file);
+      largest_key = smallest_boundary_file->largest;
+    } else {
+      continue_searching = false;
+    }
+  }
+}
+
 void VersionSet::SetupOtherInputs(Compaction* c) {
   const int level = c->level();
   InternalKey smallest, largest;
+
+  AddBoundaryInputs(icmp_, current_->files_[level], &c->inputs_[0]);
   GetRange(c->inputs_[0], &smallest, &largest);
 
-  current_->GetOverlappingInputs(level+1, &smallest, &largest, &c->inputs_[1]);
+  current_->GetOverlappingInputs(level + 1, &smallest, &largest,
+                                 &c->inputs_[1]);
 
   // Get entire range covered by compaction
   InternalKey all_start, all_limit;
@@ -1358,6 +1396,7 @@ void VersionSet::SetupOtherInputs(Compaction* c) {
   if (!c->inputs_[1].empty()) {
     std::vector<FileMetaData*> expanded0;
     current_->GetOverlappingInputs(level, &all_start, &all_limit, &expanded0);
+    AddBoundaryInputs(icmp_, current_->files_[level], &expanded0);
     const int64_t inputs0_size = TotalFileSize(c->inputs_[0]);
     const int64_t inputs1_size = TotalFileSize(c->inputs_[1]);
     const int64_t expanded0_size = TotalFileSize(expanded0);
@@ -1367,18 +1406,14 @@ void VersionSet::SetupOtherInputs(Compaction* c) {
       InternalKey new_start, new_limit;
       GetRange(expanded0, &new_start, &new_limit);
       std::vector<FileMetaData*> expanded1;
-      current_->GetOverlappingInputs(level+1, &new_start, &new_limit,
+      current_->GetOverlappingInputs(level + 1, &new_start, &new_limit,
                                      &expanded1);
       if (expanded1.size() == c->inputs_[1].size()) {
         Log(options_->info_log,
             "Expanding@%d %d+%d (%ld+%ld bytes) to %d+%d (%ld+%ld bytes)\n",
-            level,
+            level, int(c->inputs_[0].size()), int(c->inputs_[1].size()),
-            int(c->inputs_[0].size()),
+            long(inputs0_size), long(inputs1_size), int(expanded0.size()),
-            int(c->inputs_[1].size()),
+            int(expanded1.size()), long(expanded0_size), long(inputs1_size));
-            long(inputs0_size), long(inputs1_size),
-            int(expanded0.size()),
-            int(expanded1.size()),
-            long(expanded0_size), long(inputs1_size));
         smallest = new_start;
         largest = new_limit;
         c->inputs_[0] = expanded0;
@@ -1395,13 +1430,6 @@ void VersionSet::SetupOtherInputs(Compaction* c) {
                                    &c->grandparents_);
   }
 
-  if (false) {
-    Log(options_->info_log, "Compacting %d '%s' .. '%s'",
-        level,
-        smallest.DebugString().c_str(),
-        largest.DebugString().c_str());
-  }
-
   // Update the place where we will do the next compaction for this level.
   // We update this immediately instead of waiting for the VersionEdit
   // to be applied so that if the compaction fails, we will try a different
@@ -1410,14 +1438,12 @@ void VersionSet::SetupOtherInputs(Compaction* c) {
   c->edit_.SetCompactPointer(level, largest);
 }
 
-Compaction* VersionSet::CompactRange(
+Compaction* VersionSet::CompactRange(int level, const InternalKey* begin,
-    int level,
-    const InternalKey* begin,
                                      const InternalKey* end) {
   std::vector<FileMetaData*> inputs;
   current_->GetOverlappingInputs(level, begin, end, &inputs);
   if (inputs.empty()) {
-    return NULL;
+    return nullptr;
   }
 
   // Avoid compacting too much in one shot in case the range is large.
@@ -1448,7 +1474,7 @@ Compaction* VersionSet::CompactRange(
 Compaction::Compaction(const Options* options, int level)
     : level_(level),
       max_output_file_size_(MaxFileSizeForLevel(options, level)),
-      input_version_(NULL),
+      input_version_(nullptr),
       grandparent_index_(0),
       seen_key_(false),
       overlapped_bytes_(0) {
@@ -1458,7 +1484,7 @@ Compaction::Compaction(const Options* options, int level)
 }
 
 Compaction::~Compaction() {
-  if (input_version_ != NULL) {
+  if (input_version_ != nullptr) {
     input_version_->Unref();
   }
 }
@@ -1486,7 +1512,7 @@ bool Compaction::IsBaseLevelForKey(const Slice& user_key) {
   const Comparator* user_cmp = input_version_->vset_->icmp_.user_comparator();
   for (int lvl = level_ + 2; lvl < config::kNumLevels; lvl++) {
     const std::vector<FileMetaData*>& files = input_version_->files_[lvl];
-    for (; level_ptrs_[lvl] < files.size(); ) {
+    while (level_ptrs_[lvl] < files.size()) {
       FileMetaData* f = files[level_ptrs_[lvl]];
       if (user_cmp->Compare(user_key, f->largest.user_key()) <= 0) {
         // We've advanced far enough
@@ -1508,7 +1534,8 @@ bool Compaction::ShouldStopBefore(const Slice& internal_key) {
   const InternalKeyComparator* icmp = &vset->icmp_;
   while (grandparent_index_ < grandparents_.size() &&
          icmp->Compare(internal_key,
-                    grandparents_[grandparent_index_]->largest.Encode()) > 0) {
+                       grandparents_[grandparent_index_]->largest.Encode()) >
+             0) {
     if (seen_key_) {
       overlapped_bytes_ += grandparents_[grandparent_index_]->file_size;
     }
@@ -1526,9 +1553,9 @@ bool Compaction::ShouldStopBefore(const Slice& internal_key) {
 }
 
 void Compaction::ReleaseInputs() {
-  if (input_version_ != NULL) {
+  if (input_version_ != nullptr) {
     input_version_->Unref();
-    input_version_ = NULL;
+    input_version_ = nullptr;
   }
 }
 

db/version_set.h

@@ -18,6 +18,7 @@
 #include <map>
 #include <set>
 #include <vector>
+
 #include "db/dbformat.h"
 #include "db/version_edit.h"
 #include "port/port.h"
@@ -25,7 +26,9 @@
 
 namespace leveldb {
 
-namespace log { class Writer; }
+namespace log {
+class Writer;
+}
 
 class Compaction;
 class Iterator;
@@ -39,18 +42,16 @@ class WritableFile;
 // Return the smallest index i such that files[i]->largest >= key.
 // Return files.size() if there is no such file.
 // REQUIRES: "files" contains a sorted list of non-overlapping files.
-extern int FindFile(const InternalKeyComparator& icmp,
+int FindFile(const InternalKeyComparator& icmp,
-                    const std::vector<FileMetaData*>& files,
+             const std::vector<FileMetaData*>& files, const Slice& key);
-                    const Slice& key);
 
 // Returns true iff some file in "files" overlaps the user key range
 // [*smallest,*largest].
-// smallest==NULL represents a key smaller than all keys in the DB.
+// smallest==nullptr represents a key smaller than all keys in the DB.
-// largest==NULL represents a key largest than all keys in the DB.
+// largest==nullptr represents a key largest than all keys in the DB.
 // REQUIRES: If disjoint_sorted_files, files[] contains disjoint ranges
 //           in sorted order.
-extern bool SomeFileOverlapsRange(
+bool SomeFileOverlapsRange(const InternalKeyComparator& icmp,
-    const InternalKeyComparator& icmp,
                            bool disjoint_sorted_files,
                            const std::vector<FileMetaData*>& files,
                            const Slice* smallest_user_key,
@@ -58,11 +59,6 @@ extern bool SomeFileOverlapsRange(
 
 class Version {
  public:
-  // Append to *iters a sequence of iterators that will
-  // yield the contents of this Version when merged together.
-  // REQUIRES: This version has been saved (see VersionSet::SaveTo)
-  void AddIterators(const ReadOptions&, std::vector<Iterator*>* iters);
-
   // Lookup the value for key.  If found, store it in *val and
   // return OK.  Else return a non-OK status.  Fills *stats.
   // REQUIRES: lock is not held
@@ -70,6 +66,12 @@ class Version {
     FileMetaData* seek_file;
     int seek_file_level;
   };
+
+  // Append to *iters a sequence of iterators that will
+  // yield the contents of this Version when merged together.
+  // REQUIRES: This version has been saved (see VersionSet::SaveTo)
+  void AddIterators(const ReadOptions&, std::vector<Iterator*>* iters);
+
   Status Get(const ReadOptions&, const LookupKey& key, std::string* val,
              GetStats* stats);
 
@@ -91,16 +93,15 @@ class Version {
 
   void GetOverlappingInputs(
       int level,
-      const InternalKey* begin,         // NULL means before all keys
+      const InternalKey* begin,  // nullptr means before all keys
-      const InternalKey* end,           // NULL means after all keys
+      const InternalKey* end,    // nullptr means after all keys
       std::vector<FileMetaData*>* inputs);
 
   // Returns true iff some file in the specified level overlaps
   // some part of [*smallest_user_key,*largest_user_key].
-  // smallest_user_key==NULL represents a key smaller than all keys in the DB.
+  // smallest_user_key==nullptr represents a key smaller than all the DB's keys.
-  // largest_user_key==NULL represents a key largest than all keys in the DB.
+  // largest_user_key==nullptr represents a key largest than all the DB's keys.
-  bool OverlapInLevel(int level,
+  bool OverlapInLevel(int level, const Slice* smallest_user_key,
-                      const Slice* smallest_user_key,
                       const Slice* largest_user_key);
 
   // Return the level at which we should place a new memtable compaction
@@ -118,6 +119,22 @@ class Version {
   friend class VersionSet;
 
   class LevelFileNumIterator;
+
+  explicit Version(VersionSet* vset)
+      : vset_(vset),
+        next_(this),
+        prev_(this),
+        refs_(0),
+        file_to_compact_(nullptr),
+        file_to_compact_level_(-1),
+        compaction_score_(-1),
+        compaction_level_(-1) {}
+
+  Version(const Version&) = delete;
+  Version& operator=(const Version&) = delete;
+
+  ~Version();
+
   Iterator* NewConcatenatingIterator(const ReadOptions&, int level) const;
 
   // Call func(arg, level, f) for every file that overlaps user_key in
@@ -125,8 +142,7 @@ class Version {
   // false, makes no more calls.
   //
   // REQUIRES: user portion of internal_key == user_key.
-  void ForEachOverlapping(Slice user_key, Slice internal_key,
+  void ForEachOverlapping(Slice user_key, Slice internal_key, void* arg,
-                          void* arg,
                           bool (*func)(void*, int, FileMetaData*));
 
   VersionSet* vset_;  // VersionSet to which this Version belongs
@@ -146,28 +162,15 @@ class Version {
   // are initialized by Finalize().
   double compaction_score_;
   int compaction_level_;
-
-  explicit Version(VersionSet* vset)
-      : vset_(vset), next_(this), prev_(this), refs_(0),
-        file_to_compact_(NULL),
-        file_to_compact_level_(-1),
-        compaction_score_(-1),
-        compaction_level_(-1) {
-  }
-
-  ~Version();
-
-  // No copying allowed
-  Version(const Version&);
-  void operator=(const Version&);
 };
 
 class VersionSet {
  public:
-  VersionSet(const std::string& dbname,
+  VersionSet(const std::string& dbname, const Options* options,
-             const Options* options,
+             TableCache* table_cache, const InternalKeyComparator*);
-             TableCache* table_cache,
+  VersionSet(const VersionSet&) = delete;
-             const InternalKeyComparator*);
+  VersionSet& operator=(const VersionSet&) = delete;
+
   ~VersionSet();
 
   // Apply *edit to the current version to form a new descriptor that
@@ -179,7 +182,7 @@ class VersionSet {
       EXCLUSIVE_LOCKS_REQUIRED(mu);
 
   // Recover the last saved descriptor from persistent storage.
-  Status Recover(bool *save_manifest);
+  Status Recover(bool* save_manifest);
 
   // Return the current version.
   Version* current() const { return current_; }
@@ -225,18 +228,16 @@ class VersionSet {
   uint64_t PrevLogNumber() const { return prev_log_number_; }
 
   // Pick level and inputs for a new compaction.
-  // Returns NULL if there is no compaction to be done.
+  // Returns nullptr if there is no compaction to be done.
   // Otherwise returns a pointer to a heap-allocated object that
   // describes the compaction.  Caller should delete the result.
   Compaction* PickCompaction();
 
   // Return a compaction object for compacting the range [begin,end] in
-  // the specified level.  Returns NULL if there is nothing in that
+  // the specified level.  Returns nullptr if there is nothing in that
   // level that overlaps the specified range.  Caller should delete
   // the result.
-  Compaction* CompactRange(
+  Compaction* CompactRange(int level, const InternalKey* begin,
-      int level,
-      const InternalKey* begin,
                            const InternalKey* end);
 
   // Return the maximum overlapping data (in bytes) at next level for any
@@ -250,7 +251,7 @@ class VersionSet {
   // Returns true iff some level needs a compaction.
   bool NeedsCompaction() const {
     Version* v = current_;
-    return (v->compaction_score_ >= 1) || (v->file_to_compact_ != NULL);
+    return (v->compaction_score_ >= 1) || (v->file_to_compact_ != nullptr);
   }
 
   // Add all files listed in any live version to *live.
@@ -278,14 +279,12 @@ class VersionSet {
 
   void Finalize(Version* v);
 
-  void GetRange(const std::vector<FileMetaData*>& inputs,
+  void GetRange(const std::vector<FileMetaData*>& inputs, InternalKey* smallest,
-                InternalKey* smallest,
                 InternalKey* largest);
 
   void GetRange2(const std::vector<FileMetaData*>& inputs1,
                  const std::vector<FileMetaData*>& inputs2,
-                 InternalKey* smallest,
+                 InternalKey* smallest, InternalKey* largest);
-                 InternalKey* largest);
 
   void SetupOtherInputs(Compaction* c);
 
@@ -314,10 +313,6 @@ class VersionSet {
   // Per-level key at which the next compaction at that level should start.
   // Either an empty string, or a valid InternalKey.
   std::string compact_pointer_[config::kNumLevels];
-
-  // No copying allowed
-  VersionSet(const VersionSet&);
-  void operator=(const VersionSet&);
 };
 
 // A Compaction encapsulates information about a compaction.

db/version_set_test.cc

@@ -11,10 +11,7 @@ namespace leveldb {
 
 class FindFileTest {
  public:
-  std::vector<FileMetaData*> files_;
+  FindFileTest() : disjoint_sorted_files_(true) {}
-  bool disjoint_sorted_files_;
-
-  FindFileTest() : disjoint_sorted_files_(true) { }
 
   ~FindFileTest() {
     for (int i = 0; i < files_.size(); i++) {
@@ -40,20 +37,25 @@ class FindFileTest {
 
   bool Overlaps(const char* smallest, const char* largest) {
     InternalKeyComparator cmp(BytewiseComparator());
-    Slice s(smallest != NULL ? smallest : "");
+    Slice s(smallest != nullptr ? smallest : "");
-    Slice l(largest != NULL ? largest : "");
+    Slice l(largest != nullptr ? largest : "");
     return SomeFileOverlapsRange(cmp, disjoint_sorted_files_, files_,
-                                 (smallest != NULL ? &s : NULL),
+                                 (smallest != nullptr ? &s : nullptr),
-                                 (largest != NULL ? &l : NULL));
+                                 (largest != nullptr ? &l : nullptr));
   }
+
+  bool disjoint_sorted_files_;
+
+ private:
+  std::vector<FileMetaData*> files_;
 };
 
 TEST(FindFileTest, Empty) {
   ASSERT_EQ(0, Find("foo"));
-  ASSERT_TRUE(! Overlaps("a", "z"));
+  ASSERT_TRUE(!Overlaps("a", "z"));
-  ASSERT_TRUE(! Overlaps(NULL, "z"));
+  ASSERT_TRUE(!Overlaps(nullptr, "z"));
-  ASSERT_TRUE(! Overlaps("a", NULL));
+  ASSERT_TRUE(!Overlaps("a", nullptr));
-  ASSERT_TRUE(! Overlaps(NULL, NULL));
+  ASSERT_TRUE(!Overlaps(nullptr, nullptr));
 }
 
 TEST(FindFileTest, Single) {
@@ -65,8 +67,8 @@ TEST(FindFileTest, Single) {
   ASSERT_EQ(1, Find("q1"));
   ASSERT_EQ(1, Find("z"));
 
-  ASSERT_TRUE(! Overlaps("a", "b"));
+  ASSERT_TRUE(!Overlaps("a", "b"));
-  ASSERT_TRUE(! Overlaps("z1", "z2"));
+  ASSERT_TRUE(!Overlaps("z1", "z2"));
   ASSERT_TRUE(Overlaps("a", "p"));
   ASSERT_TRUE(Overlaps("a", "q"));
   ASSERT_TRUE(Overlaps("a", "z"));
@@ -78,15 +80,14 @@ TEST(FindFileTest, Single) {
   ASSERT_TRUE(Overlaps("q", "q"));
   ASSERT_TRUE(Overlaps("q", "q1"));
 
-  ASSERT_TRUE(! Overlaps(NULL, "j"));
+  ASSERT_TRUE(!Overlaps(nullptr, "j"));
-  ASSERT_TRUE(! Overlaps("r", NULL));
+  ASSERT_TRUE(!Overlaps("r", nullptr));
-  ASSERT_TRUE(Overlaps(NULL, "p"));
+  ASSERT_TRUE(Overlaps(nullptr, "p"));
-  ASSERT_TRUE(Overlaps(NULL, "p1"));
+  ASSERT_TRUE(Overlaps(nullptr, "p1"));
-  ASSERT_TRUE(Overlaps("q", NULL));
+  ASSERT_TRUE(Overlaps("q", nullptr));
-  ASSERT_TRUE(Overlaps(NULL, NULL));
+  ASSERT_TRUE(Overlaps(nullptr, nullptr));
 }
 
-
 TEST(FindFileTest, Multiple) {
   Add("150", "200");
   Add("200", "250");
@@ -110,10 +111,10 @@ TEST(FindFileTest, Multiple) {
   ASSERT_EQ(3, Find("450"));
   ASSERT_EQ(4, Find("451"));
 
-  ASSERT_TRUE(! Overlaps("100", "149"));
+  ASSERT_TRUE(!Overlaps("100", "149"));
-  ASSERT_TRUE(! Overlaps("251", "299"));
+  ASSERT_TRUE(!Overlaps("251", "299"));
-  ASSERT_TRUE(! Overlaps("451", "500"));
+  ASSERT_TRUE(!Overlaps("451", "500"));
-  ASSERT_TRUE(! Overlaps("351", "399"));
+  ASSERT_TRUE(!Overlaps("351", "399"));
 
   ASSERT_TRUE(Overlaps("100", "150"));
   ASSERT_TRUE(Overlaps("100", "200"));
@@ -130,25 +131,25 @@ TEST(FindFileTest, MultipleNullBoundaries) {
   Add("200", "250");
   Add("300", "350");
   Add("400", "450");
-  ASSERT_TRUE(! Overlaps(NULL, "149"));
+  ASSERT_TRUE(!Overlaps(nullptr, "149"));
-  ASSERT_TRUE(! Overlaps("451", NULL));
+  ASSERT_TRUE(!Overlaps("451", nullptr));
-  ASSERT_TRUE(Overlaps(NULL, NULL));
+  ASSERT_TRUE(Overlaps(nullptr, nullptr));
-  ASSERT_TRUE(Overlaps(NULL, "150"));
+  ASSERT_TRUE(Overlaps(nullptr, "150"));
-  ASSERT_TRUE(Overlaps(NULL, "199"));
+  ASSERT_TRUE(Overlaps(nullptr, "199"));
-  ASSERT_TRUE(Overlaps(NULL, "200"));
+  ASSERT_TRUE(Overlaps(nullptr, "200"));
-  ASSERT_TRUE(Overlaps(NULL, "201"));
+  ASSERT_TRUE(Overlaps(nullptr, "201"));
-  ASSERT_TRUE(Overlaps(NULL, "400"));
+  ASSERT_TRUE(Overlaps(nullptr, "400"));
-  ASSERT_TRUE(Overlaps(NULL, "800"));
+  ASSERT_TRUE(Overlaps(nullptr, "800"));
-  ASSERT_TRUE(Overlaps("100", NULL));
+  ASSERT_TRUE(Overlaps("100", nullptr));
-  ASSERT_TRUE(Overlaps("200", NULL));
+  ASSERT_TRUE(Overlaps("200", nullptr));
-  ASSERT_TRUE(Overlaps("449", NULL));
+  ASSERT_TRUE(Overlaps("449", nullptr));
-  ASSERT_TRUE(Overlaps("450", NULL));
+  ASSERT_TRUE(Overlaps("450", nullptr));
 }
 
 TEST(FindFileTest, OverlapSequenceChecks) {
   Add("200", "200", 5000, 3000);
-  ASSERT_TRUE(! Overlaps("199", "199"));
+  ASSERT_TRUE(!Overlaps("199", "199"));
-  ASSERT_TRUE(! Overlaps("201", "300"));
+  ASSERT_TRUE(!Overlaps("201", "300"));
   ASSERT_TRUE(Overlaps("200", "200"));
   ASSERT_TRUE(Overlaps("190", "200"));
   ASSERT_TRUE(Overlaps("200", "210"));
@@ -158,8 +159,8 @@ TEST(FindFileTest, OverlappingFiles) {
   Add("150", "600");
   Add("400", "500");
   disjoint_sorted_files_ = false;
-  ASSERT_TRUE(! Overlaps("100", "149"));
+  ASSERT_TRUE(!Overlaps("100", "149"));
-  ASSERT_TRUE(! Overlaps("601", "700"));
+  ASSERT_TRUE(!Overlaps("601", "700"));
   ASSERT_TRUE(Overlaps("100", "150"));
   ASSERT_TRUE(Overlaps("100", "200"));
   ASSERT_TRUE(Overlaps("100", "300"));
@@ -172,8 +173,160 @@ TEST(FindFileTest, OverlappingFiles) {
   ASSERT_TRUE(Overlaps("600", "700"));
 }
 
+void AddBoundaryInputs(const InternalKeyComparator& icmp,
+                       const std::vector<FileMetaData*>& level_files,
+                       std::vector<FileMetaData*>* compaction_files);
+
+class AddBoundaryInputsTest {
+ public:
+  std::vector<FileMetaData*> level_files_;
+  std::vector<FileMetaData*> compaction_files_;
+  std::vector<FileMetaData*> all_files_;
+  InternalKeyComparator icmp_;
+
+  AddBoundaryInputsTest() : icmp_(BytewiseComparator()) {}
+
+  ~AddBoundaryInputsTest() {
+    for (size_t i = 0; i < all_files_.size(); ++i) {
+      delete all_files_[i];
+    }
+    all_files_.clear();
+  }
+
+  FileMetaData* CreateFileMetaData(uint64_t number, InternalKey smallest,
+                                   InternalKey largest) {
+    FileMetaData* f = new FileMetaData();
+    f->number = number;
+    f->smallest = smallest;
+    f->largest = largest;
+    all_files_.push_back(f);
+    return f;
+  }
+};
+
+TEST(AddBoundaryInputsTest, TestEmptyFileSets) {
+  AddBoundaryInputs(icmp_, level_files_, &compaction_files_);
+  ASSERT_TRUE(compaction_files_.empty());
+  ASSERT_TRUE(level_files_.empty());
+}
+
+TEST(AddBoundaryInputsTest, TestEmptyLevelFiles) {
+  FileMetaData* f1 =
+      CreateFileMetaData(1, InternalKey("100", 2, kTypeValue),
+                         InternalKey(InternalKey("100", 1, kTypeValue)));
+  compaction_files_.push_back(f1);
+
+  AddBoundaryInputs(icmp_, level_files_, &compaction_files_);
+  ASSERT_EQ(1, compaction_files_.size());
+  ASSERT_EQ(f1, compaction_files_[0]);
+  ASSERT_TRUE(level_files_.empty());
+}
+
+TEST(AddBoundaryInputsTest, TestEmptyCompactionFiles) {
+  FileMetaData* f1 =
+      CreateFileMetaData(1, InternalKey("100", 2, kTypeValue),
+                         InternalKey(InternalKey("100", 1, kTypeValue)));
+  level_files_.push_back(f1);
+
+  AddBoundaryInputs(icmp_, level_files_, &compaction_files_);
+  ASSERT_TRUE(compaction_files_.empty());
+  ASSERT_EQ(1, level_files_.size());
+  ASSERT_EQ(f1, level_files_[0]);
+}
+
+TEST(AddBoundaryInputsTest, TestNoBoundaryFiles) {
+  FileMetaData* f1 =
+      CreateFileMetaData(1, InternalKey("100", 2, kTypeValue),
+                         InternalKey(InternalKey("100", 1, kTypeValue)));
+  FileMetaData* f2 =
+      CreateFileMetaData(1, InternalKey("200", 2, kTypeValue),
+                         InternalKey(InternalKey("200", 1, kTypeValue)));
+  FileMetaData* f3 =
+      CreateFileMetaData(1, InternalKey("300", 2, kTypeValue),
+                         InternalKey(InternalKey("300", 1, kTypeValue)));
+
+  level_files_.push_back(f3);
+  level_files_.push_back(f2);
+  level_files_.push_back(f1);
+  compaction_files_.push_back(f2);
+  compaction_files_.push_back(f3);
+
+  AddBoundaryInputs(icmp_, level_files_, &compaction_files_);
+  ASSERT_EQ(2, compaction_files_.size());
+}
+
+TEST(AddBoundaryInputsTest, TestOneBoundaryFiles) {
+  FileMetaData* f1 =
+      CreateFileMetaData(1, InternalKey("100", 3, kTypeValue),
+                         InternalKey(InternalKey("100", 2, kTypeValue)));
+  FileMetaData* f2 =
+      CreateFileMetaData(1, InternalKey("100", 1, kTypeValue),
+                         InternalKey(InternalKey("200", 3, kTypeValue)));
+  FileMetaData* f3 =
+      CreateFileMetaData(1, InternalKey("300", 2, kTypeValue),
+                         InternalKey(InternalKey("300", 1, kTypeValue)));
+
+  level_files_.push_back(f3);
+  level_files_.push_back(f2);
+  level_files_.push_back(f1);
+  compaction_files_.push_back(f1);
+
+  AddBoundaryInputs(icmp_, level_files_, &compaction_files_);
+  ASSERT_EQ(2, compaction_files_.size());
+  ASSERT_EQ(f1, compaction_files_[0]);
+  ASSERT_EQ(f2, compaction_files_[1]);
+}
+
+TEST(AddBoundaryInputsTest, TestTwoBoundaryFiles) {
+  FileMetaData* f1 =
+      CreateFileMetaData(1, InternalKey("100", 6, kTypeValue),
+                         InternalKey(InternalKey("100", 5, kTypeValue)));
+  FileMetaData* f2 =
+      CreateFileMetaData(1, InternalKey("100", 2, kTypeValue),
+                         InternalKey(InternalKey("300", 1, kTypeValue)));
+  FileMetaData* f3 =
+      CreateFileMetaData(1, InternalKey("100", 4, kTypeValue),
+                         InternalKey(InternalKey("100", 3, kTypeValue)));
+
+  level_files_.push_back(f2);
+  level_files_.push_back(f3);
+  level_files_.push_back(f1);
+  compaction_files_.push_back(f1);
+
+  AddBoundaryInputs(icmp_, level_files_, &compaction_files_);
+  ASSERT_EQ(3, compaction_files_.size());
+  ASSERT_EQ(f1, compaction_files_[0]);
+  ASSERT_EQ(f3, compaction_files_[1]);
+  ASSERT_EQ(f2, compaction_files_[2]);
+}
+
+TEST(AddBoundaryInputsTest, TestDisjoinFilePointers) {
+  FileMetaData* f1 =
+      CreateFileMetaData(1, InternalKey("100", 6, kTypeValue),
+                         InternalKey(InternalKey("100", 5, kTypeValue)));
+  FileMetaData* f2 =
+      CreateFileMetaData(1, InternalKey("100", 6, kTypeValue),
+                         InternalKey(InternalKey("100", 5, kTypeValue)));
+  FileMetaData* f3 =
+      CreateFileMetaData(1, InternalKey("100", 2, kTypeValue),
+                         InternalKey(InternalKey("300", 1, kTypeValue)));
+  FileMetaData* f4 =
+      CreateFileMetaData(1, InternalKey("100", 4, kTypeValue),
+                         InternalKey(InternalKey("100", 3, kTypeValue)));
+
+  level_files_.push_back(f2);
+  level_files_.push_back(f3);
+  level_files_.push_back(f4);
+
+  compaction_files_.push_back(f1);
+
+  AddBoundaryInputs(icmp_, level_files_, &compaction_files_);
+  ASSERT_EQ(3, compaction_files_.size());
+  ASSERT_EQ(f1, compaction_files_[0]);
+  ASSERT_EQ(f4, compaction_files_[1]);
+  ASSERT_EQ(f3, compaction_files_[2]);
+}
+
 }  // namespace leveldb
 
-int main(int argc, char** argv) {
+int main(int argc, char** argv) { return leveldb::test::RunAllTests(); }
-  return leveldb::test::RunAllTests();
-}

db/write_batch.cc

@@ -15,10 +15,10 @@
 
 #include "leveldb/write_batch.h"
 
-#include "leveldb/db.h"
 #include "db/dbformat.h"
 #include "db/memtable.h"
 #include "db/write_batch_internal.h"
+#include "leveldb/db.h"
 #include "util/coding.h"
 
 namespace leveldb {
@@ -26,19 +26,19 @@ namespace leveldb {
 // WriteBatch header has an 8-byte sequence number followed by a 4-byte count.
 static const size_t kHeader = 12;
 
-WriteBatch::WriteBatch() {
+WriteBatch::WriteBatch() { Clear(); }
-  Clear();
-}
 
-WriteBatch::~WriteBatch() { }
+WriteBatch::~WriteBatch() = default;
 
-WriteBatch::Handler::~Handler() { }
+WriteBatch::Handler::~Handler() = default;
 
 void WriteBatch::Clear() {
   rep_.clear();
   rep_.resize(kHeader);
 }
 
+size_t WriteBatch::ApproximateSize() const { return rep_.size(); }
+
 Status WriteBatch::Iterate(Handler* handler) const {
   Slice input(rep_);
   if (input.size() < kHeader) {
@@ -108,25 +108,28 @@ void WriteBatch::Delete(const Slice& key) {
   PutLengthPrefixedSlice(&rep_, key);
 }
 
+void WriteBatch::Append(const WriteBatch& source) {
+  WriteBatchInternal::Append(this, &source);
+}
+
 namespace {
 class MemTableInserter : public WriteBatch::Handler {
  public:
   SequenceNumber sequence_;
   MemTable* mem_;
 
-  virtual void Put(const Slice& key, const Slice& value) {
+  void Put(const Slice& key, const Slice& value) override {
     mem_->Add(sequence_, kTypeValue, key, value);
     sequence_++;
   }
-  virtual void Delete(const Slice& key) {
+  void Delete(const Slice& key) override {
     mem_->Add(sequence_, kTypeDeletion, key, Slice());
     sequence_++;
   }
 };
 }  // namespace
 
-Status WriteBatchInternal::InsertInto(const WriteBatch* b,
+Status WriteBatchInternal::InsertInto(const WriteBatch* b, MemTable* memtable) {
-                                      MemTable* memtable) {
   MemTableInserter inserter;
   inserter.sequence_ = WriteBatchInternal::Sequence(b);
   inserter.mem_ = memtable;

db/write_batch_internal.h

@@ -29,13 +29,9 @@ class WriteBatchInternal {
   // this batch.
   static void SetSequence(WriteBatch* batch, SequenceNumber seq);
 
-  static Slice Contents(const WriteBatch* batch) {
+  static Slice Contents(const WriteBatch* batch) { return Slice(batch->rep_); }
-    return Slice(batch->rep_);
-  }
 
-  static size_t ByteSize(const WriteBatch* batch) {
+  static size_t ByteSize(const WriteBatch* batch) { return batch->rep_.size(); }
-    return batch->rep_.size();
-  }
 
   static void SetContents(WriteBatch* batch, const Slice& contents);
 
@@ -46,5 +42,4 @@ class WriteBatchInternal {
 
 }  // namespace leveldb
 
-
 #endif  // STORAGE_LEVELDB_DB_WRITE_BATCH_INTERNAL_H_

db/write_batch_test.cc

@@ -52,7 +52,7 @@ static std::string PrintContents(WriteBatch* b) {
   return state;
 }
 
-class WriteBatchTest { };
+class WriteBatchTest {};
 
 TEST(WriteBatchTest, Empty) {
   WriteBatch batch;
@@ -68,7 +68,8 @@ TEST(WriteBatchTest, Multiple) {
   WriteBatchInternal::SetSequence(&batch, 100);
   ASSERT_EQ(100, WriteBatchInternal::Sequence(&batch));
   ASSERT_EQ(3, WriteBatchInternal::Count(&batch));
-  ASSERT_EQ("Put(baz, boo)@102"
+  ASSERT_EQ(
+      "Put(baz, boo)@102"
       "Delete(box)@101"
       "Put(foo, bar)@100",
       PrintContents(&batch));
@@ -81,8 +82,9 @@ TEST(WriteBatchTest, Corruption) {
   WriteBatchInternal::SetSequence(&batch, 200);
   Slice contents = WriteBatchInternal::Contents(&batch);
   WriteBatchInternal::SetContents(&batch,
-                                  Slice(contents.data(),contents.size()-1));
+                                  Slice(contents.data(), contents.size() - 1));
-  ASSERT_EQ("Put(foo, bar)@200"
+  ASSERT_EQ(
+      "Put(foo, bar)@200"
       "ParseError()",
       PrintContents(&batch));
 }
@@ -91,30 +93,45 @@ TEST(WriteBatchTest, Append) {
   WriteBatch b1, b2;
   WriteBatchInternal::SetSequence(&b1, 200);
   WriteBatchInternal::SetSequence(&b2, 300);
-  WriteBatchInternal::Append(&b1, &b2);
+  b1.Append(b2);
-  ASSERT_EQ("",
+  ASSERT_EQ("", PrintContents(&b1));
-            PrintContents(&b1));
   b2.Put("a", "va");
-  WriteBatchInternal::Append(&b1, &b2);
+  b1.Append(b2);
-  ASSERT_EQ("Put(a, va)@200",
+  ASSERT_EQ("Put(a, va)@200", PrintContents(&b1));
-            PrintContents(&b1));
   b2.Clear();
   b2.Put("b", "vb");
-  WriteBatchInternal::Append(&b1, &b2);
+  b1.Append(b2);
-  ASSERT_EQ("Put(a, va)@200"
+  ASSERT_EQ(
+      "Put(a, va)@200"
       "Put(b, vb)@201",
       PrintContents(&b1));
   b2.Delete("foo");
-  WriteBatchInternal::Append(&b1, &b2);
+  b1.Append(b2);
-  ASSERT_EQ("Put(a, va)@200"
+  ASSERT_EQ(
+      "Put(a, va)@200"
       "Put(b, vb)@202"
       "Put(b, vb)@201"
       "Delete(foo)@203",
       PrintContents(&b1));
 }
 
+TEST(WriteBatchTest, ApproximateSize) {
+  WriteBatch batch;
+  size_t empty_size = batch.ApproximateSize();
+
+  batch.Put(Slice("foo"), Slice("bar"));
+  size_t one_key_size = batch.ApproximateSize();
+  ASSERT_LT(empty_size, one_key_size);
+
+  batch.Put(Slice("baz"), Slice("boo"));
+  size_t two_keys_size = batch.ApproximateSize();
+  ASSERT_LT(one_key_size, two_keys_size);
+
+  batch.Delete(Slice("box"));
+  size_t post_delete_size = batch.ApproximateSize();
+  ASSERT_LT(two_keys_size, post_delete_size);
+}
+
 }  // namespace leveldb
 
-int main(int argc, char** argv) {
+int main(int argc, char** argv) { return leveldb::test::RunAllTests(); }
-  return leveldb::test::RunAllTests();
-}

doc/benchmark.html

@@ -90,9 +90,9 @@ div.bsql {
 <h4>Benchmark Source Code</h4>
 <p>We wrote benchmark tools for SQLite and Kyoto TreeDB based on LevelDB's <span class="code">db_bench</span>. The code for each of the benchmarks resides here:</p>
 <ul>
-	<li> <b>LevelDB:</b> <a href="http://code.google.com/p/leveldb/source/browse/trunk/db/db_bench.cc">db/db_bench.cc</a>.</li>
+	<li> <b>LevelDB:</b> <a href="https://github.com/google/leveldb/blob/master/benchmarks/db_bench.cc">benchmarks/db_bench.cc</a>.</li>
-	<li> <b>SQLite:</b> <a href="http://code.google.com/p/leveldb/source/browse/#svn%2Ftrunk%2Fdoc%2Fbench%2Fdb_bench_sqlite3.cc">doc/bench/db_bench_sqlite3.cc</a>.</li>
+	<li> <b>SQLite:</b> <a href="https://github.com/google/leveldb/blob/master/benchmarks/db_bench_sqlite3.cc">benchmarks/db_bench_sqlite3.cc</a>.</li>
-	<li> <b>Kyoto TreeDB:</b> <a href="http://code.google.com/p/leveldb/source/browse/#svn%2Ftrunk%2Fdoc%2Fbench%2Fdb_bench_tree_db.cc">doc/bench/db_bench_tree_db.cc</a>.</li>
+	<li> <b>Kyoto TreeDB:</b> <a href="https://github.com/google/leveldb/blob/master/benchmarks/db_bench_tree_db.cc">benchmarks/db_bench_tree_db.cc</a>.</li>
 </ul>
 
 <h4>Custom Build Specifications</h4>

doc/impl.md

@@ -64,13 +64,15 @@ Other files used for miscellaneous purposes may also be present (LOCK, *.dbtmp).
 
 ## Level 0
 
-When the log file grows above a certain size (1MB by default):
+When the log file grows above a certain size (4MB by default):
-Create a brand new memtable and log file and direct future updates here
+Create a brand new memtable and log file and direct future updates here.
+
 In the background:
-Write the contents of the previous memtable to an sstable
+
-Discard the memtable
+1. Write the contents of the previous memtable to an sstable.
-Delete the old log file and the old memtable
+2. Discard the memtable.
-Add the new sstable to the young (level-0) level.
+3. Delete the old log file and the old memtable.
+4. Add the new sstable to the young (level-0) level.
 
 ## Compactions
 

doc/index.md

@@ -307,7 +307,7 @@ version numbers found in the keys to decide how to interpret them.
 ## Performance
 
 Performance can be tuned by changing the default values of the types defined in
-`include/leveldb/options.h`.
+`include/options.h`.
 
 ### Block size
 
@@ -338,19 +338,19 @@ options.compression = leveldb::kNoCompression;
 ### Cache
 
 The contents of the database are stored in a set of files in the filesystem and
-each file stores a sequence of compressed blocks. If options.cache is non-NULL,
+each file stores a sequence of compressed blocks. If options.block_cache is
-it is used to cache frequently used uncompressed block contents.
+non-NULL, it is used to cache frequently used uncompressed block contents.
 
 ```c++
 #include "leveldb/cache.h"
 
 leveldb::Options options;
-options.cache = leveldb::NewLRUCache(100 * 1048576);  // 100MB cache
+options.block_cache = leveldb::NewLRUCache(100 * 1048576);  // 100MB cache
 leveldb::DB* db;
 leveldb::DB::Open(options, name, &db);
 ... use the db ...
 delete db
-delete options.cache;
+delete options.block_cache;
 ```
 
 Note that the cache holds uncompressed data, and therefore it should be sized

helpers/memenv/memenv.cc

@@ -4,14 +4,18 @@
 
 #include "helpers/memenv/memenv.h"
 
+#include <string.h>
+
+#include <limits>
+#include <map>
+#include <string>
+#include <vector>
+
 #include "leveldb/env.h"
 #include "leveldb/status.h"
 #include "port/port.h"
+#include "port/thread_annotations.h"
 #include "util/mutexlock.h"
-#include <map>
-#include <string.h>
-#include <string>
-#include <vector>
 
 namespace leveldb {
 
@@ -23,6 +27,10 @@ class FileState {
   // and the caller must call Ref() at least once.
   FileState() : refs_(0), size_(0) {}
 
+  // No copying allowed.
+  FileState(const FileState&) = delete;
+  FileState& operator=(const FileState&) = delete;
+
   // Increase the reference count.
   void Ref() {
     MutexLock lock(&refs_mutex_);
@@ -47,9 +55,22 @@ class FileState {
     }
   }
 
-  uint64_t Size() const { return size_; }
+  uint64_t Size() const {
+    MutexLock lock(&blocks_mutex_);
+    return size_;
+  }
+
+  void Truncate() {
+    MutexLock lock(&blocks_mutex_);
+    for (char*& block : blocks_) {
+      delete[] block;
+    }
+    blocks_.clear();
+    size_ = 0;
+  }
 
   Status Read(uint64_t offset, size_t n, Slice* result, char* scratch) const {
+    MutexLock lock(&blocks_mutex_);
     if (offset > size_) {
       return Status::IOError("Offset greater than file size.");
     }
@@ -62,16 +83,9 @@ class FileState {
       return Status::OK();
     }
 
-    assert(offset / kBlockSize <= SIZE_MAX);
+    assert(offset / kBlockSize <= std::numeric_limits<size_t>::max());
     size_t block = static_cast<size_t>(offset / kBlockSize);
     size_t block_offset = offset % kBlockSize;
-
-    if (n <= kBlockSize - block_offset) {
-      // The requested bytes are all in the first block.
-      *result = Slice(blocks_[block] + block_offset, n);
-      return Status::OK();
-    }
-
     size_t bytes_to_copy = n;
     char* dst = scratch;
 
@@ -96,6 +110,7 @@ class FileState {
     const char* src = data.data();
     size_t src_len = data.size();
 
+    MutexLock lock(&blocks_mutex_);
     while (src_len > 0) {
       size_t avail;
       size_t offset = size_ % kBlockSize;
@@ -122,28 +137,17 @@ class FileState {
   }
 
  private:
-  // Private since only Unref() should be used to delete it.
+  enum { kBlockSize = 8 * 1024 };
-  ~FileState() {
-    for (std::vector<char*>::iterator i = blocks_.begin(); i != blocks_.end();
-         ++i) {
-      delete [] *i;
-    }
-  }
 
-  // No copying allowed.
+  // Private since only Unref() should be used to delete it.
-  FileState(const FileState&);
+  ~FileState() { Truncate(); }
-  void operator=(const FileState&);
 
   port::Mutex refs_mutex_;
-  int refs_;  // Protected by refs_mutex_;
+  int refs_ GUARDED_BY(refs_mutex_);
 
-  // The following fields are not protected by any mutex. They are only mutable
+  mutable port::Mutex blocks_mutex_;
-  // while the file is being written, and concurrent access is not allowed
+  std::vector<char*> blocks_ GUARDED_BY(blocks_mutex_);
-  // to writable files.
+  uint64_t size_ GUARDED_BY(blocks_mutex_);
-  std::vector<char*> blocks_;
-  uint64_t size_;
-
-  enum { kBlockSize = 8 * 1024 };
 };
 
 class SequentialFileImpl : public SequentialFile {
@@ -152,11 +156,9 @@ class SequentialFileImpl : public SequentialFile {
     file_->Ref();
   }
 
-  ~SequentialFileImpl() {
+  ~SequentialFileImpl() override { file_->Unref(); }
-    file_->Unref();
-  }
 
-  virtual Status Read(size_t n, Slice* result, char* scratch) {
+  Status Read(size_t n, Slice* result, char* scratch) override {
     Status s = file_->Read(pos_, n, result, scratch);
     if (s.ok()) {
       pos_ += result->size();
@@ -164,7 +166,7 @@ class SequentialFileImpl : public SequentialFile {
     return s;
   }
 
-  virtual Status Skip(uint64_t n) {
+  Status Skip(uint64_t n) override {
     if (pos_ > file_->Size()) {
       return Status::IOError("pos_ > file_->Size()");
     }
@@ -176,7 +178,7 @@ class SequentialFileImpl : public SequentialFile {
     return Status::OK();
   }
 
-  virtual std::string GetName() const { return "[memenv]"; }
+  virtual std::string GetName() const override { return "[memenv]"; }
  private:
   FileState* file_;
   uint64_t pos_;
@@ -184,68 +186,58 @@ class SequentialFileImpl : public SequentialFile {
 
 class RandomAccessFileImpl : public RandomAccessFile {
  public:
-  explicit RandomAccessFileImpl(FileState* file) : file_(file) {
+  explicit RandomAccessFileImpl(FileState* file) : file_(file) { file_->Ref(); }
-    file_->Ref();
-  }
 
-  ~RandomAccessFileImpl() {
+  ~RandomAccessFileImpl() override { file_->Unref(); }
-    file_->Unref();
-  }
 
-  virtual Status Read(uint64_t offset, size_t n, Slice* result,
+  Status Read(uint64_t offset, size_t n, Slice* result,
-                      char* scratch) const {
+              char* scratch) const override {
     return file_->Read(offset, n, result, scratch);
   }
 
-  virtual std::string GetName() const { return "[memenv]"; }
+  virtual std::string GetName() const override { return "[memenv]"; }
  private:
   FileState* file_;
 };
 
 class WritableFileImpl : public WritableFile {
  public:
-  WritableFileImpl(FileState* file) : file_(file) {
+  WritableFileImpl(FileState* file) : file_(file) { file_->Ref(); }
-    file_->Ref();
-  }
 
-  ~WritableFileImpl() {
+  ~WritableFileImpl() override { file_->Unref(); }
-    file_->Unref();
-  }
 
-  virtual Status Append(const Slice& data) {
+  Status Append(const Slice& data) override { return file_->Append(data); }
-    return file_->Append(data);
-  }
 
-  virtual Status Close() { return Status::OK(); }
+  Status Close() override { return Status::OK(); }
-  virtual Status Flush() { return Status::OK(); }
+  Status Flush() override { return Status::OK(); }
-  virtual Status Sync() { return Status::OK(); }
+  Status Sync() override { return Status::OK(); }
 
-  virtual std::string GetName() const { return "[memenv]"; }
+  virtual std::string GetName() const override { return "[memenv]"; }
  private:
   FileState* file_;
 };
 
 class NoOpLogger : public Logger {
  public:
-  virtual void Logv(const char* format, va_list ap) { }
+  void Logv(const char* format, va_list ap) override {}
 };
 
 class InMemoryEnv : public EnvWrapper {
  public:
-  explicit InMemoryEnv(Env* base_env) : EnvWrapper(base_env) { }
+  explicit InMemoryEnv(Env* base_env) : EnvWrapper(base_env) {}
 
-  virtual ~InMemoryEnv() {
+  ~InMemoryEnv() override {
-    for (FileSystem::iterator i = file_map_.begin(); i != file_map_.end(); ++i){
+    for (const auto& kvp : file_map_) {
-      i->second->Unref();
+      kvp.second->Unref();
     }
   }
 
   // Partial implementation of the Env interface.
-  virtual Status NewSequentialFile(const std::string& fname,
+  Status NewSequentialFile(const std::string& fname,
-                                   SequentialFile** result) {
+                           SequentialFile** result) override {
     MutexLock lock(&mutex_);
     if (file_map_.find(fname) == file_map_.end()) {
-      *result = NULL;
+      *result = nullptr;
       return Status::IOError(fname, "File not found");
     }
 
@@ -253,11 +245,11 @@ class InMemoryEnv : public EnvWrapper {
     return Status::OK();
   }
 
-  virtual Status NewRandomAccessFile(const std::string& fname,
+  Status NewRandomAccessFile(const std::string& fname,
-                                     RandomAccessFile** result) {
+                             RandomAccessFile** result) override {
     MutexLock lock(&mutex_);
     if (file_map_.find(fname) == file_map_.end()) {
-      *result = NULL;
+      *result = nullptr;
       return Status::IOError(fname, "File not found");
     }
 
@@ -265,27 +257,32 @@ class InMemoryEnv : public EnvWrapper {
     return Status::OK();
   }
 
-  virtual Status NewWritableFile(const std::string& fname,
+  Status NewWritableFile(const std::string& fname,
-                                 WritableFile** result) {
+                         WritableFile** result) override {
     MutexLock lock(&mutex_);
-    if (file_map_.find(fname) != file_map_.end()) {
+    FileSystem::iterator it = file_map_.find(fname);
-      DeleteFileInternal(fname);
-    }
 
-    FileState* file = new FileState();
+    FileState* file;
+    if (it == file_map_.end()) {
+      // File is not currently open.
+      file = new FileState();
       file->Ref();
       file_map_[fname] = file;
+    } else {
+      file = it->second;
+      file->Truncate();
+    }
 
     *result = new WritableFileImpl(file);
     return Status::OK();
   }
 
-  virtual Status NewAppendableFile(const std::string& fname,
+  Status NewAppendableFile(const std::string& fname,
-                                   WritableFile** result) {
+                           WritableFile** result) override {
     MutexLock lock(&mutex_);
     FileState** sptr = &file_map_[fname];
     FileState* file = *sptr;
-    if (file == NULL) {
+    if (file == nullptr) {
       file = new FileState();
       file->Ref();
     }
@@ -293,18 +290,18 @@ class InMemoryEnv : public EnvWrapper {
     return Status::OK();
   }
 
-  virtual bool FileExists(const std::string& fname) {
+  bool FileExists(const std::string& fname) override {
     MutexLock lock(&mutex_);
     return file_map_.find(fname) != file_map_.end();
   }
 
-  virtual Status GetChildren(const std::string& dir,
+  Status GetChildren(const std::string& dir,
-                             std::vector<std::string>* result) {
+                     std::vector<std::string>* result) override {
     MutexLock lock(&mutex_);
     result->clear();
 
-    for (FileSystem::iterator i = file_map_.begin(); i != file_map_.end(); ++i){
+    for (const auto& kvp : file_map_) {
-      const std::string& filename = i->first;
+      const std::string& filename = kvp.first;
 
       if (filename.size() >= dir.size() + 1 && filename[dir.size()] == '/' &&
           Slice(filename).starts_with(Slice(dir))) {
@@ -315,7 +312,8 @@ class InMemoryEnv : public EnvWrapper {
     return Status::OK();
   }
 
-  void DeleteFileInternal(const std::string& fname) {
+  void DeleteFileInternal(const std::string& fname)
+      EXCLUSIVE_LOCKS_REQUIRED(mutex_) {
     if (file_map_.find(fname) == file_map_.end()) {
       return;
     }
@@ -324,7 +322,7 @@ class InMemoryEnv : public EnvWrapper {
     file_map_.erase(fname);
   }
 
-  virtual Status DeleteFile(const std::string& fname) {
+  Status DeleteFile(const std::string& fname) override {
     MutexLock lock(&mutex_);
     if (file_map_.find(fname) == file_map_.end()) {
       return Status::IOError(fname, "File not found");
@@ -334,15 +332,11 @@ class InMemoryEnv : public EnvWrapper {
     return Status::OK();
   }
 
-  virtual Status CreateDir(const std::string& dirname) {
+  Status CreateDir(const std::string& dirname) override { return Status::OK(); }
-    return Status::OK();
-  }
 
-  virtual Status DeleteDir(const std::string& dirname) {
+  Status DeleteDir(const std::string& dirname) override { return Status::OK(); }
-    return Status::OK();
-  }
 
-  virtual Status GetFileSize(const std::string& fname, uint64_t* file_size) {
+  Status GetFileSize(const std::string& fname, uint64_t* file_size) override {
     MutexLock lock(&mutex_);
     if (file_map_.find(fname) == file_map_.end()) {
       return Status::IOError(fname, "File not found");
@@ -352,8 +346,8 @@ class InMemoryEnv : public EnvWrapper {
     return Status::OK();
   }
 
-  virtual Status RenameFile(const std::string& src,
+  Status RenameFile(const std::string& src,
-                            const std::string& target) {
+                    const std::string& target) override {
     MutexLock lock(&mutex_);
     if (file_map_.find(src) == file_map_.end()) {
       return Status::IOError(src, "File not found");
@@ -365,22 +359,22 @@ class InMemoryEnv : public EnvWrapper {
     return Status::OK();
   }
 
-  virtual Status LockFile(const std::string& fname, FileLock** lock) {
+  Status LockFile(const std::string& fname, FileLock** lock) override {
     *lock = new FileLock;
     return Status::OK();
   }
 
-  virtual Status UnlockFile(FileLock* lock) {
+  Status UnlockFile(FileLock* lock) override {
     delete lock;
     return Status::OK();
   }
 
-  virtual Status GetTestDirectory(std::string* path) {
+  Status GetTestDirectory(std::string* path) override {
     *path = "/test";
     return Status::OK();
   }
 
-  virtual Status NewLogger(const std::string& fname, Logger** result) {
+  Status NewLogger(const std::string& fname, Logger** result) override {
     *result = new NoOpLogger;
     return Status::OK();
   }
@@ -388,14 +382,13 @@ class InMemoryEnv : public EnvWrapper {
  private:
   // Map from filenames to FileState objects, representing a simple file system.
   typedef std::map<std::string, FileState*> FileSystem;
+
   port::Mutex mutex_;
-  FileSystem file_map_;  // Protected by mutex_.
+  FileSystem file_map_ GUARDED_BY(mutex_);
 };
 
 }  // namespace
 
-Env* NewMemEnv(Env* base_env) {
+Env* NewMemEnv(Env* base_env) { return new InMemoryEnv(base_env); }
-  return new InMemoryEnv(base_env);
-}
 
 }  // namespace leveldb

helpers/memenv/memenv.h

@@ -5,6 +5,8 @@
 #ifndef STORAGE_LEVELDB_HELPERS_MEMENV_MEMENV_H_
 #define STORAGE_LEVELDB_HELPERS_MEMENV_MEMENV_H_
 
+#include "leveldb/export.h"
+
 namespace leveldb {
 
 class Env;
@@ -13,7 +15,7 @@ class Env;
 // all non-file-storage tasks to base_env. The caller must delete the result
 // when it is no longer needed.
 // *base_env must remain live while the result is in use.
-Env* NewMemEnv(Env* base_env);
+LEVELDB_EXPORT Env* NewMemEnv(Env* base_env);
 
 }  // namespace leveldb
 

helpers/memenv/memenv_test.cc

@@ -4,25 +4,22 @@
 
 #include "helpers/memenv/memenv.h"
 
+#include <string>
+#include <vector>
+
 #include "db/db_impl.h"
 #include "leveldb/db.h"
 #include "leveldb/env.h"
 #include "util/testharness.h"
-#include <string>
-#include <vector>
 
 namespace leveldb {
 
 class MemEnvTest {
  public:
-  Env* env_;
+  MemEnvTest() : env_(NewMemEnv(Env::Default())) {}
+  ~MemEnvTest() { delete env_; }
 
-  MemEnvTest()
+  Env* env_;
-      : env_(NewMemEnv(Env::Default())) {
-  }
-  ~MemEnvTest() {
-    delete env_;
-  }
 };
 
 TEST(MemEnvTest, Basics) {
@@ -188,7 +185,30 @@ TEST(MemEnvTest, LargeWrite) {
   }
   ASSERT_TRUE(write_data == read_data);
   delete seq_file;
-  delete [] scratch;
+  delete[] scratch;
+}
+
+TEST(MemEnvTest, OverwriteOpenFile) {
+  const char kWrite1Data[] = "Write #1 data";
+  const size_t kFileDataLen = sizeof(kWrite1Data) - 1;
+  const std::string kTestFileName = test::TmpDir() + "/leveldb-TestFile.dat";
+
+  ASSERT_OK(WriteStringToFile(env_, kWrite1Data, kTestFileName));
+
+  RandomAccessFile* rand_file;
+  ASSERT_OK(env_->NewRandomAccessFile(kTestFileName, &rand_file));
+
+  const char kWrite2Data[] = "Write #2 data";
+  ASSERT_OK(WriteStringToFile(env_, kWrite2Data, kTestFileName));
+
+  // Verify that overwriting an open file will result in the new file data
+  // being read from files opened before the write.
+  Slice result;
+  char scratch[kFileDataLen];
+  ASSERT_OK(rand_file->Read(0, kFileDataLen, &result, scratch));
+  ASSERT_EQ(0, result.compare(kWrite2Data));
+
+  delete rand_file;
 }
 
 TEST(MemEnvTest, DBTest) {
@@ -236,6 +256,4 @@ TEST(MemEnvTest, DBTest) {
 
 }  // namespace leveldb
 
-int main(int argc, char** argv) {
+int main(int argc, char** argv) { return leveldb::test::RunAllTests(); }
-  return leveldb::test::RunAllTests();
-}

include/leveldb/c.h

@@ -32,7 +32,7 @@
   On failure, leveldb frees the old value of *errptr and
   set *errptr to a malloc()ed error message.
 
-  (4) Bools have the type unsigned char (0 == false; rest == true)
+  (4) Bools have the type uint8_t (0 == false; rest == true)
 
   (5) All of the pointer arguments must be non-NULL.
 */
@@ -48,6 +48,8 @@ extern "C" {
 #include <stddef.h>
 #include <stdint.h>
 
+#include "leveldb/export.h"
+
 /* Exported types */
 
 typedef struct leveldb_t leveldb_t;
@@ -69,204 +71,182 @@ typedef struct leveldb_writeoptions_t  leveldb_writeoptions_t;
 
 /* DB operations */
 
-extern leveldb_t* leveldb_open(
+LEVELDB_EXPORT leveldb_t* leveldb_open(const leveldb_options_t* options,
-    const leveldb_options_t* options,
+                                       const char* name, char** errptr);
-    const char* name,
-    char** errptr);
 
-extern void leveldb_close(leveldb_t* db);
+LEVELDB_EXPORT void leveldb_close(leveldb_t* db);
 
-extern void leveldb_put(
+LEVELDB_EXPORT void leveldb_put(leveldb_t* db,
-    leveldb_t* db,
                                 const leveldb_writeoptions_t* options,
-    const char* key, size_t keylen,
+                                const char* key, size_t keylen, const char* val,
-    const char* val, size_t vallen,
+                                size_t vallen, char** errptr);
-    char** errptr);
 
-extern void leveldb_delete(
+LEVELDB_EXPORT void leveldb_delete(leveldb_t* db,
-    leveldb_t* db,
                                    const leveldb_writeoptions_t* options,
                                    const char* key, size_t keylen,
                                    char** errptr);
 
-extern void leveldb_write(
+LEVELDB_EXPORT void leveldb_write(leveldb_t* db,
-    leveldb_t* db,
                                   const leveldb_writeoptions_t* options,
-    leveldb_writebatch_t* batch,
+                                  leveldb_writebatch_t* batch, char** errptr);
-    char** errptr);
 
 /* Returns NULL if not found.  A malloc()ed array otherwise.
    Stores the length of the array in *vallen. */
-extern char* leveldb_get(
+LEVELDB_EXPORT char* leveldb_get(leveldb_t* db,
-    leveldb_t* db,
                                  const leveldb_readoptions_t* options,
-    const char* key, size_t keylen,
+                                 const char* key, size_t keylen, size_t* vallen,
-    size_t* vallen,
                                  char** errptr);
 
-extern leveldb_iterator_t* leveldb_create_iterator(
+LEVELDB_EXPORT leveldb_iterator_t* leveldb_create_iterator(
-    leveldb_t* db,
+    leveldb_t* db, const leveldb_readoptions_t* options);
-    const leveldb_readoptions_t* options);
 
-extern const leveldb_snapshot_t* leveldb_create_snapshot(
+LEVELDB_EXPORT const leveldb_snapshot_t* leveldb_create_snapshot(leveldb_t* db);
-    leveldb_t* db);
 
-extern void leveldb_release_snapshot(
+LEVELDB_EXPORT void leveldb_release_snapshot(
-    leveldb_t* db,
+    leveldb_t* db, const leveldb_snapshot_t* snapshot);
-    const leveldb_snapshot_t* snapshot);
 
 /* Returns NULL if property name is unknown.
    Else returns a pointer to a malloc()-ed null-terminated value. */
-extern char* leveldb_property_value(
+LEVELDB_EXPORT char* leveldb_property_value(leveldb_t* db,
-    leveldb_t* db,
                                             const char* propname);
 
-extern void leveldb_approximate_sizes(
+LEVELDB_EXPORT void leveldb_approximate_sizes(
-    leveldb_t* db,
+    leveldb_t* db, int num_ranges, const char* const* range_start_key,
-    int num_ranges,
+    const size_t* range_start_key_len, const char* const* range_limit_key,
-    const char* const* range_start_key, const size_t* range_start_key_len,
+    const size_t* range_limit_key_len, uint64_t* sizes);
-    const char* const* range_limit_key, const size_t* range_limit_key_len,
-    uint64_t* sizes);
 
-extern void leveldb_compact_range(
+LEVELDB_EXPORT void leveldb_compact_range(leveldb_t* db, const char* start_key,
-    leveldb_t* db,
+                                          size_t start_key_len,
-    const char* start_key, size_t start_key_len,
+                                          const char* limit_key,
-    const char* limit_key, size_t limit_key_len);
+                                          size_t limit_key_len);
 
 /* Management operations */
 
-extern void leveldb_destroy_db(
+LEVELDB_EXPORT void leveldb_destroy_db(const leveldb_options_t* options,
-    const leveldb_options_t* options,
+                                       const char* name, char** errptr);
-    const char* name,
-    char** errptr);
 
-extern void leveldb_repair_db(
+LEVELDB_EXPORT void leveldb_repair_db(const leveldb_options_t* options,
-    const leveldb_options_t* options,
+                                      const char* name, char** errptr);
-    const char* name,
-    char** errptr);
 
 /* Iterator */
 
-extern void leveldb_iter_destroy(leveldb_iterator_t*);
+LEVELDB_EXPORT void leveldb_iter_destroy(leveldb_iterator_t*);
-extern unsigned char leveldb_iter_valid(const leveldb_iterator_t*);
+LEVELDB_EXPORT uint8_t leveldb_iter_valid(const leveldb_iterator_t*);
-extern void leveldb_iter_seek_to_first(leveldb_iterator_t*);
+LEVELDB_EXPORT void leveldb_iter_seek_to_first(leveldb_iterator_t*);
-extern void leveldb_iter_seek_to_last(leveldb_iterator_t*);
+LEVELDB_EXPORT void leveldb_iter_seek_to_last(leveldb_iterator_t*);
-extern void leveldb_iter_seek(leveldb_iterator_t*, const char* k, size_t klen);
+LEVELDB_EXPORT void leveldb_iter_seek(leveldb_iterator_t*, const char* k,
-extern void leveldb_iter_next(leveldb_iterator_t*);
+                                      size_t klen);
-extern void leveldb_iter_prev(leveldb_iterator_t*);
+LEVELDB_EXPORT void leveldb_iter_next(leveldb_iterator_t*);
-extern const char* leveldb_iter_key(const leveldb_iterator_t*, size_t* klen);
+LEVELDB_EXPORT void leveldb_iter_prev(leveldb_iterator_t*);
-extern const char* leveldb_iter_value(const leveldb_iterator_t*, size_t* vlen);
+LEVELDB_EXPORT const char* leveldb_iter_key(const leveldb_iterator_t*,
-extern void leveldb_iter_get_error(const leveldb_iterator_t*, char** errptr);
+                                            size_t* klen);
+LEVELDB_EXPORT const char* leveldb_iter_value(const leveldb_iterator_t*,
+                                              size_t* vlen);
+LEVELDB_EXPORT void leveldb_iter_get_error(const leveldb_iterator_t*,
+                                           char** errptr);
 
 /* Write batch */
 
-extern leveldb_writebatch_t* leveldb_writebatch_create();
+LEVELDB_EXPORT leveldb_writebatch_t* leveldb_writebatch_create(void);
-extern void leveldb_writebatch_destroy(leveldb_writebatch_t*);
+LEVELDB_EXPORT void leveldb_writebatch_destroy(leveldb_writebatch_t*);
-extern void leveldb_writebatch_clear(leveldb_writebatch_t*);
+LEVELDB_EXPORT void leveldb_writebatch_clear(leveldb_writebatch_t*);
-extern void leveldb_writebatch_put(
+LEVELDB_EXPORT void leveldb_writebatch_put(leveldb_writebatch_t*,
-    leveldb_writebatch_t*,
                                            const char* key, size_t klen,
                                            const char* val, size_t vlen);
-extern void leveldb_writebatch_delete(
+LEVELDB_EXPORT void leveldb_writebatch_delete(leveldb_writebatch_t*,
-    leveldb_writebatch_t*,
                                               const char* key, size_t klen);
-extern void leveldb_writebatch_iterate(
+LEVELDB_EXPORT void leveldb_writebatch_iterate(
-    leveldb_writebatch_t*,
+    const leveldb_writebatch_t*, void* state,
-    void* state,
     void (*put)(void*, const char* k, size_t klen, const char* v, size_t vlen),
     void (*deleted)(void*, const char* k, size_t klen));
+LEVELDB_EXPORT void leveldb_writebatch_append(
+    leveldb_writebatch_t* destination, const leveldb_writebatch_t* source);
 
 /* Options */
 
-extern leveldb_options_t* leveldb_options_create();
+LEVELDB_EXPORT leveldb_options_t* leveldb_options_create(void);
-extern void leveldb_options_destroy(leveldb_options_t*);
+LEVELDB_EXPORT void leveldb_options_destroy(leveldb_options_t*);
-extern void leveldb_options_set_comparator(
+LEVELDB_EXPORT void leveldb_options_set_comparator(leveldb_options_t*,
-    leveldb_options_t*,
                                                    leveldb_comparator_t*);
-extern void leveldb_options_set_filter_policy(
+LEVELDB_EXPORT void leveldb_options_set_filter_policy(leveldb_options_t*,
-    leveldb_options_t*,
                                                       leveldb_filterpolicy_t*);
-extern void leveldb_options_set_create_if_missing(
+LEVELDB_EXPORT void leveldb_options_set_create_if_missing(leveldb_options_t*,
-    leveldb_options_t*, unsigned char);
+                                                          uint8_t);
-extern void leveldb_options_set_error_if_exists(
+LEVELDB_EXPORT void leveldb_options_set_error_if_exists(leveldb_options_t*,
-    leveldb_options_t*, unsigned char);
+                                                        uint8_t);
-extern void leveldb_options_set_paranoid_checks(
+LEVELDB_EXPORT void leveldb_options_set_paranoid_checks(leveldb_options_t*,
-    leveldb_options_t*, unsigned char);
+                                                        uint8_t);
-extern void leveldb_options_set_env(leveldb_options_t*, leveldb_env_t*);
+LEVELDB_EXPORT void leveldb_options_set_env(leveldb_options_t*, leveldb_env_t*);
-extern void leveldb_options_set_info_log(leveldb_options_t*, leveldb_logger_t*);
+LEVELDB_EXPORT void leveldb_options_set_info_log(leveldb_options_t*,
-extern void leveldb_options_set_write_buffer_size(leveldb_options_t*, size_t);
+                                                 leveldb_logger_t*);
-extern void leveldb_options_set_max_open_files(leveldb_options_t*, int);
+LEVELDB_EXPORT void leveldb_options_set_write_buffer_size(leveldb_options_t*,
-extern void leveldb_options_set_cache(leveldb_options_t*, leveldb_cache_t*);
+                                                          size_t);
-extern void leveldb_options_set_block_size(leveldb_options_t*, size_t);
+LEVELDB_EXPORT void leveldb_options_set_max_open_files(leveldb_options_t*, int);
-extern void leveldb_options_set_block_restart_interval(leveldb_options_t*, int);
+LEVELDB_EXPORT void leveldb_options_set_cache(leveldb_options_t*,
+                                              leveldb_cache_t*);
+LEVELDB_EXPORT void leveldb_options_set_block_size(leveldb_options_t*, size_t);
+LEVELDB_EXPORT void leveldb_options_set_block_restart_interval(
+    leveldb_options_t*, int);
+LEVELDB_EXPORT void leveldb_options_set_max_file_size(leveldb_options_t*,
+                                                      size_t);
 
-enum {
+enum { leveldb_no_compression = 0, leveldb_snappy_compression = 1 };
-  leveldb_no_compression = 0,
+LEVELDB_EXPORT void leveldb_options_set_compression(leveldb_options_t*, int);
-  leveldb_snappy_compression = 1
-};
-extern void leveldb_options_set_compression(leveldb_options_t*, int);
 
 /* Comparator */
 
-extern leveldb_comparator_t* leveldb_comparator_create(
+LEVELDB_EXPORT leveldb_comparator_t* leveldb_comparator_create(
-    void* state,
+    void* state, void (*destructor)(void*),
-    void (*destructor)(void*),
+    int (*compare)(void*, const char* a, size_t alen, const char* b,
-    int (*compare)(
+                   size_t blen),
-        void*,
-        const char* a, size_t alen,
-        const char* b, size_t blen),
     const char* (*name)(void*));
-extern void leveldb_comparator_destroy(leveldb_comparator_t*);
+LEVELDB_EXPORT void leveldb_comparator_destroy(leveldb_comparator_t*);
 
 /* Filter policy */
 
-extern leveldb_filterpolicy_t* leveldb_filterpolicy_create(
+LEVELDB_EXPORT leveldb_filterpolicy_t* leveldb_filterpolicy_create(
-    void* state,
+    void* state, void (*destructor)(void*),
-    void (*destructor)(void*),
+    char* (*create_filter)(void*, const char* const* key_array,
-    char* (*create_filter)(
+                           const size_t* key_length_array, int num_keys,
-        void*,
-        const char* const* key_array, const size_t* key_length_array,
-        int num_keys,
                            size_t* filter_length),
-    unsigned char (*key_may_match)(
+    uint8_t (*key_may_match)(void*, const char* key, size_t length,
-        void*,
-        const char* key, size_t length,
                              const char* filter, size_t filter_length),
     const char* (*name)(void*));
-extern void leveldb_filterpolicy_destroy(leveldb_filterpolicy_t*);
+LEVELDB_EXPORT void leveldb_filterpolicy_destroy(leveldb_filterpolicy_t*);
 
-extern leveldb_filterpolicy_t* leveldb_filterpolicy_create_bloom(
+LEVELDB_EXPORT leveldb_filterpolicy_t* leveldb_filterpolicy_create_bloom(
     int bits_per_key);
 
 /* Read options */
 
-extern leveldb_readoptions_t* leveldb_readoptions_create();
+LEVELDB_EXPORT leveldb_readoptions_t* leveldb_readoptions_create(void);
-extern void leveldb_readoptions_destroy(leveldb_readoptions_t*);
+LEVELDB_EXPORT void leveldb_readoptions_destroy(leveldb_readoptions_t*);
-extern void leveldb_readoptions_set_verify_checksums(
+LEVELDB_EXPORT void leveldb_readoptions_set_verify_checksums(
-    leveldb_readoptions_t*,
+    leveldb_readoptions_t*, uint8_t);
-    unsigned char);
+LEVELDB_EXPORT void leveldb_readoptions_set_fill_cache(leveldb_readoptions_t*,
-extern void leveldb_readoptions_set_fill_cache(
+                                                       uint8_t);
-    leveldb_readoptions_t*, unsigned char);
+LEVELDB_EXPORT void leveldb_readoptions_set_snapshot(leveldb_readoptions_t*,
-extern void leveldb_readoptions_set_snapshot(
-    leveldb_readoptions_t*,
                                                      const leveldb_snapshot_t*);
 
 /* Write options */
 
-extern leveldb_writeoptions_t* leveldb_writeoptions_create();
+LEVELDB_EXPORT leveldb_writeoptions_t* leveldb_writeoptions_create(void);
-extern void leveldb_writeoptions_destroy(leveldb_writeoptions_t*);
+LEVELDB_EXPORT void leveldb_writeoptions_destroy(leveldb_writeoptions_t*);
-extern void leveldb_writeoptions_set_sync(
+LEVELDB_EXPORT void leveldb_writeoptions_set_sync(leveldb_writeoptions_t*,
-    leveldb_writeoptions_t*, unsigned char);
+                                                  uint8_t);
 
 /* Cache */
 
-extern leveldb_cache_t* leveldb_cache_create_lru(size_t capacity);
+LEVELDB_EXPORT leveldb_cache_t* leveldb_cache_create_lru(size_t capacity);
-extern void leveldb_cache_destroy(leveldb_cache_t* cache);
+LEVELDB_EXPORT void leveldb_cache_destroy(leveldb_cache_t* cache);
 
 /* Env */
 
-extern leveldb_env_t* leveldb_create_default_env();
+LEVELDB_EXPORT leveldb_env_t* leveldb_create_default_env(void);
-extern void leveldb_env_destroy(leveldb_env_t*);
+LEVELDB_EXPORT void leveldb_env_destroy(leveldb_env_t*);
+
+/* If not NULL, the returned buffer must be released using leveldb_free(). */
+LEVELDB_EXPORT char* leveldb_env_get_test_directory(leveldb_env_t*);
 
 /* Utility */
 
@@ -275,13 +255,13 @@ extern void leveldb_env_destroy(leveldb_env_t*);
    in this file.  Note that in certain cases (typically on Windows), you
    may need to call this routine instead of free(ptr) to dispose of
    malloc()-ed memory returned by this library. */
-extern void leveldb_free(void* ptr);
+LEVELDB_EXPORT void leveldb_free(void* ptr);
 
 /* Return the major version number for this release. */
-extern int leveldb_major_version();
+LEVELDB_EXPORT int leveldb_major_version(void);
 
 /* Return the minor version number for this release. */
-extern int leveldb_minor_version();
+LEVELDB_EXPORT int leveldb_minor_version(void);
 
 #ifdef __cplusplus
 } /* end extern "C" */

include/leveldb/cache.h

@@ -19,26 +19,31 @@
 #define STORAGE_LEVELDB_INCLUDE_CACHE_H_
 
 #include <stdint.h>
+
+#include "leveldb/export.h"
 #include "leveldb/slice.h"
 
 namespace leveldb {
 
-class Cache;
+class LEVELDB_EXPORT Cache;
 
 // Create a new cache with a fixed size capacity.  This implementation
 // of Cache uses a least-recently-used eviction policy.
-extern Cache* NewLRUCache(size_t capacity);
+LEVELDB_EXPORT Cache* NewLRUCache(size_t capacity);
 
-class Cache {
+class LEVELDB_EXPORT Cache {
  public:
-  Cache() { }
+  Cache() = default;
+
+  Cache(const Cache&) = delete;
+  Cache& operator=(const Cache&) = delete;
 
   // Destroys all existing entries by calling the "deleter"
   // function that was passed to the constructor.
   virtual ~Cache();
 
   // Opaque handle to an entry stored in the cache.
-  struct Handle { };
+  struct Handle {};
 
   // Insert a mapping from key->value into the cache and assign it
   // the specified charge against the total cache capacity.
@@ -52,7 +57,7 @@ class Cache {
   virtual Handle* Insert(const Slice& key, void* value, size_t charge,
                          void (*deleter)(const Slice& key, void* value)) = 0;
 
-  // If the cache has no mapping for "key", returns NULL.
+  // If the cache has no mapping for "key", returns nullptr.
   //
   // Else return a handle that corresponds to the mapping.  The caller
   // must call this->Release(handle) when the returned mapping is no
@@ -99,10 +104,6 @@ class Cache {
 
   struct Rep;
   Rep* rep_;
-
-  // No copying allowed
-  Cache(const Cache&);
-  void operator=(const Cache&);
 };
 
 }  // namespace leveldb

include/leveldb/comparator.h

@@ -7,6 +7,8 @@
 
 #include <string>
 
+#include "leveldb/export.h"
+
 namespace leveldb {
 
 class Slice;
@@ -15,7 +17,7 @@ class Slice;
 // used as keys in an sstable or a database.  A Comparator implementation
 // must be thread-safe since leveldb may invoke its methods concurrently
 // from multiple threads.
-class Comparator {
+class LEVELDB_EXPORT Comparator {
  public:
   virtual ~Comparator();
 
@@ -43,8 +45,7 @@ class Comparator {
   // If *start < limit, changes *start to a short string in [start,limit).
   // Simple comparator implementations may return with *start unchanged,
   // i.e., an implementation of this method that does nothing is correct.
-  virtual void FindShortestSeparator(
+  virtual void FindShortestSeparator(std::string* start,
-      std::string* start,
                                      const Slice& limit) const = 0;
 
   // Changes *key to a short string >= *key.
@@ -56,7 +57,7 @@ class Comparator {
 // Return a builtin comparator that uses lexicographic byte-wise
 // ordering.  The result remains the property of this module and
 // must not be deleted.
-extern const Comparator* BytewiseComparator();
+LEVELDB_EXPORT const Comparator* BytewiseComparator();
 
 }  // namespace leveldb
 

include/leveldb/db.h

@@ -7,14 +7,16 @@
 
 #include <stdint.h>
 #include <stdio.h>
+
+#include "leveldb/export.h"
 #include "leveldb/iterator.h"
 #include "leveldb/options.h"
 
 namespace leveldb {
 
-// Update Makefile if you change these
+// Update CMakeLists.txt if you change these
 static const int kMajorVersion = 1;
-static const int kMinorVersion = 20;
+static const int kMinorVersion = 22;
 
 struct Options;
 struct ReadOptions;
@@ -24,42 +26,44 @@ class WriteBatch;
 // Abstract handle to particular state of a DB.
 // A Snapshot is an immutable object and can therefore be safely
 // accessed from multiple threads without any external synchronization.
-class Snapshot {
+class LEVELDB_EXPORT Snapshot {
  protected:
   virtual ~Snapshot();
 };
 
 // A range of keys
-struct Range {
+struct LEVELDB_EXPORT Range {
+  Range() = default;
+  Range(const Slice& s, const Slice& l) : start(s), limit(l) {}
+
   Slice start;  // Included in the range
   Slice limit;  // Not included in the range
-
-  Range() { }
-  Range(const Slice& s, const Slice& l) : start(s), limit(l) { }
 };
 
 // A DB is a persistent ordered map from keys to values.
 // A DB is safe for concurrent access from multiple threads without
 // any external synchronization.
-class DB {
+class LEVELDB_EXPORT DB {
  public:
   // Open the database with the specified "name".
   // Stores a pointer to a heap-allocated database in *dbptr and returns
   // OK on success.
-  // Stores NULL in *dbptr and returns a non-OK status on error.
+  // Stores nullptr in *dbptr and returns a non-OK status on error.
   // Caller should delete *dbptr when it is no longer needed.
-  static Status Open(const Options& options,
+  static Status Open(const Options& options, const std::string& name,
-                     const std::string& name,
                      DB** dbptr);
 
-  DB() { }
+  DB() = default;
+
+  DB(const DB&) = delete;
+  DB& operator=(const DB&) = delete;
+
   virtual ~DB();
 
   // Set the database entry for "key" to "value".  Returns OK on success,
   // and a non-OK status on error.
   // Note: consider setting options.sync = true.
-  virtual Status Put(const WriteOptions& options,
+  virtual Status Put(const WriteOptions& options, const Slice& key,
-                     const Slice& key,
                      const Slice& value) = 0;
 
   // Remove the database entry (if any) for "key".  Returns OK on
@@ -80,8 +84,8 @@ class DB {
   // a status for which Status::IsNotFound() returns true.
   //
   // May return some other Status on an error.
-  virtual Status Get(const ReadOptions& options,
+  virtual Status Get(const ReadOptions& options, const Slice& key,
-                     const Slice& key, std::string* value) = 0;
+                     std::string* value) = 0;
 
   // Return a heap-allocated iterator over the contents of the database.
   // The result of NewIterator() is initially invalid (caller must
@@ -136,27 +140,27 @@ class DB {
   // needed to access the data.  This operation should typically only
   // be invoked by users who understand the underlying implementation.
   //
-  // begin==NULL is treated as a key before all keys in the database.
+  // begin==nullptr is treated as a key before all keys in the database.
-  // end==NULL is treated as a key after all keys in the database.
+  // end==nullptr is treated as a key after all keys in the database.
   // Therefore the following call will compact the entire database:
-  //    db->CompactRange(NULL, NULL);
+  //    db->CompactRange(nullptr, nullptr);
   virtual void CompactRange(const Slice* begin, const Slice* end) = 0;
-
- private:
-  // No copying allowed
-  DB(const DB&);
-  void operator=(const DB&);
 };
 
 // Destroy the contents of the specified database.
 // Be very careful using this method.
-Status DestroyDB(const std::string& name, const Options& options);
+//
+// Note: For backwards compatibility, if DestroyDB is unable to list the
+// database files, Status::OK() will still be returned masking this failure.
+LEVELDB_EXPORT Status DestroyDB(const std::string& name,
+                                const Options& options);
 
 // If a DB cannot be opened, you may attempt to call this method to
 // resurrect as much of the contents of the database as possible.
 // Some data may be lost, so be careful when calling this function
 // on a database that contains important information.
-Status RepairDB(const std::string& dbname, const Options& options);
+LEVELDB_EXPORT Status RepairDB(const std::string& dbname,
+                               const Options& options);
 
 }  // namespace leveldb
 

include/leveldb/dumpfile.h

@@ -6,7 +6,9 @@
 #define STORAGE_LEVELDB_INCLUDE_DUMPFILE_H_
 
 #include <string>
+
 #include "leveldb/env.h"
+#include "leveldb/export.h"
 #include "leveldb/status.h"
 
 namespace leveldb {
@@ -18,7 +20,8 @@ namespace leveldb {
 //
 // Returns a non-OK result if fname does not name a leveldb storage
 // file, or if the file cannot be read.
-Status DumpFile(Env* env, const std::string& fname, WritableFile* dst);
+LEVELDB_EXPORT Status DumpFile(Env* env, const std::string& fname,
+                               WritableFile* dst);
 
 }  // namespace leveldb
 

include/leveldb/env.h

@@ -13,12 +13,36 @@
 #ifndef STORAGE_LEVELDB_INCLUDE_ENV_H_
 #define STORAGE_LEVELDB_INCLUDE_ENV_H_
 
-#include <string>
-#include <vector>
 #include <stdarg.h>
 #include <stdint.h>
+
+#include <string>
+#include <vector>
+
+#include "leveldb/export.h"
 #include "leveldb/status.h"
 
+#if defined(_WIN32)
+// The leveldb::Env class below contains a DeleteFile method.
+// At the same time, <windows.h>, a fairly popular header
+// file for Windows applications, defines a DeleteFile macro.
+//
+// Without any intervention on our part, the result of this
+// unfortunate coincidence is that the name of the
+// leveldb::Env::DeleteFile method seen by the compiler depends on
+// whether <windows.h> was included before or after the LevelDB
+// headers.
+//
+// To avoid headaches, we undefined DeleteFile (if defined) and
+// redefine it at the bottom of this file. This way <windows.h>
+// can be included before this file (or not at all) and the
+// exported method will always be leveldb::Env::DeleteFile.
+#if defined(DeleteFile)
+#undef DeleteFile
+#define LEVELDB_DELETEFILE_UNDEFINED
+#endif  // defined(DeleteFile)
+#endif  // defined(_WIN32)
+
 namespace leveldb {
 
 class FileLock;
@@ -28,9 +52,13 @@ class SequentialFile;
 class Slice;
 class WritableFile;
 
-class Env {
+class LEVELDB_EXPORT Env {
  public:
-  Env() { }
+  Env() = default;
+
+  Env(const Env&) = delete;
+  Env& operator=(const Env&) = delete;
+
   virtual ~Env();
 
   // Return a default environment suitable for the current operating
@@ -40,20 +68,22 @@ class Env {
   // The result of Default() belongs to leveldb and must never be deleted.
   static Env* Default();
 
-  // Create a brand new sequentially-readable file with the specified name.
+  // Create an object that sequentially reads the file with the specified name.
   // On success, stores a pointer to the new file in *result and returns OK.
-  // On failure stores NULL in *result and returns non-OK.  If the file does
+  // On failure stores nullptr in *result and returns non-OK.  If the file does
-  // not exist, returns a non-OK status.
+  // not exist, returns a non-OK status.  Implementations should return a
+  // NotFound status when the file does not exist.
   //
   // The returned file will only be accessed by one thread at a time.
   virtual Status NewSequentialFile(const std::string& fname,
                                    SequentialFile** result) = 0;
 
-  // Create a brand new random access read-only file with the
+  // Create an object supporting random-access reads from the file with the
   // specified name.  On success, stores a pointer to the new file in
-  // *result and returns OK.  On failure stores NULL in *result and
+  // *result and returns OK.  On failure stores nullptr in *result and
   // returns non-OK.  If the file does not exist, returns a non-OK
-  // status.
+  // status.  Implementations should return a NotFound status when the file does
+  // not exist.
   //
   // The returned file may be concurrently accessed by multiple threads.
   virtual Status NewRandomAccessFile(const std::string& fname,
@@ -62,7 +92,7 @@ class Env {
   // Create an object that writes to a new file with the specified
   // name.  Deletes any existing file with the same name and creates a
   // new file.  On success, stores a pointer to the new file in
-  // *result and returns OK.  On failure stores NULL in *result and
+  // *result and returns OK.  On failure stores nullptr in *result and
   // returns non-OK.
   //
   // The returned file will only be accessed by one thread at a time.
@@ -72,7 +102,7 @@ class Env {
   // Create an object that either appends to an existing file, or
   // writes to a new file (if the file does not exist to begin with).
   // On success, stores a pointer to the new file in *result and
-  // returns OK.  On failure stores NULL in *result and returns
+  // returns OK.  On failure stores nullptr in *result and returns
   // non-OK.
   //
   // The returned file will only be accessed by one thread at a time.
@@ -110,7 +140,7 @@ class Env {
                             const std::string& target) = 0;
 
   // Lock the specified file.  Used to prevent concurrent access to
-  // the same db by multiple processes.  On failure, stores NULL in
+  // the same db by multiple processes.  On failure, stores nullptr in
   // *lock and returns non-OK.
   //
   // On success, stores a pointer to the object that represents the
@@ -136,16 +166,14 @@ class Env {
   // added to the same Env may run concurrently in different threads.
   // I.e., the caller may not assume that background work items are
   // serialized.
-  virtual void Schedule(
+  virtual void Schedule(void (*function)(void* arg), void* arg) = 0;
-      void (*function)(void* arg),
-      void* arg) = 0;
 
   // Start a new thread, invoking "function(arg)" within the new thread.
   // When "function(arg)" returns, the thread will be destroyed.
   virtual void StartThread(void (*function)(void* arg), void* arg) = 0;
 
   // *path is set to a temporary directory that can be used for testing. It may
-  // or many not have just been created. The directory may or may not differ
+  // or may not have just been created. The directory may or may not differ
   // between runs of the same process, but subsequent calls will return the
   // same directory.
   virtual Status GetTestDirectory(std::string* path) = 0;
@@ -159,17 +187,16 @@ class Env {
 
   // Sleep/delay the thread for the prescribed number of micro-seconds.
   virtual void SleepForMicroseconds(int micros) = 0;
-
- private:
-  // No copying allowed
-  Env(const Env&);
-  void operator=(const Env&);
 };
 
 // A file abstraction for reading sequentially through a file
-class SequentialFile {
+class LEVELDB_EXPORT SequentialFile {
  public:
-  SequentialFile() { }
+  SequentialFile() = default;
+
+  SequentialFile(const SequentialFile&) = delete;
+  SequentialFile& operator=(const SequentialFile&) = delete;
+
   virtual ~SequentialFile();
 
   // Read up to "n" bytes from the file.  "scratch[0..n-1]" may be
@@ -193,17 +220,16 @@ class SequentialFile {
 
   // Get a name for the file, only for error reporting
   virtual std::string GetName() const = 0;
-
- private:
-  // No copying allowed
-  SequentialFile(const SequentialFile&);
-  void operator=(const SequentialFile&);
 };
 
 // A file abstraction for randomly reading the contents of a file.
-class RandomAccessFile {
+class LEVELDB_EXPORT RandomAccessFile {
  public:
-  RandomAccessFile() { }
+  RandomAccessFile() = default;
+
+  RandomAccessFile(const RandomAccessFile&) = delete;
+  RandomAccessFile& operator=(const RandomAccessFile&) = delete;
+
   virtual ~RandomAccessFile();
 
   // Read up to "n" bytes from the file starting at "offset".
@@ -220,19 +246,18 @@ class RandomAccessFile {
 
   // Get a name for the file, only for error reporting
   virtual std::string GetName() const = 0;
-
- private:
-  // No copying allowed
-  RandomAccessFile(const RandomAccessFile&);
-  void operator=(const RandomAccessFile&);
 };
 
 // A file abstraction for sequential writing.  The implementation
 // must provide buffering since callers may append small fragments
 // at a time to the file.
-class WritableFile {
+class LEVELDB_EXPORT WritableFile {
  public:
-  WritableFile() { }
+  WritableFile() = default;
+
+  WritableFile(const WritableFile&) = delete;
+  WritableFile& operator=(const WritableFile&) = delete;
+
   virtual ~WritableFile();
 
   virtual Status Append(const Slice& data) = 0;
@@ -242,119 +267,130 @@ class WritableFile {
 
   // Get a name for the file, only for error reporting
   virtual std::string GetName() const = 0;
-
- private:
-  // No copying allowed
-  WritableFile(const WritableFile&);
-  void operator=(const WritableFile&);
 };
 
 // An interface for writing log messages.
-class Logger {
+class LEVELDB_EXPORT Logger {
  public:
-  Logger() { }
+  Logger() = default;
+
+  Logger(const Logger&) = delete;
+  Logger& operator=(const Logger&) = delete;
+
   virtual ~Logger();
 
   // Write an entry to the log file with the specified format.
   virtual void Logv(const char* format, va_list ap) = 0;
-
- private:
-  // No copying allowed
-  Logger(const Logger&);
-  void operator=(const Logger&);
 };
 
-
 // Identifies a locked file.
-class FileLock {
+class LEVELDB_EXPORT FileLock {
  public:
-  FileLock() { }
+  FileLock() = default;
+
+  FileLock(const FileLock&) = delete;
+  FileLock& operator=(const FileLock&) = delete;
+
   virtual ~FileLock();
- private:
-  // No copying allowed
-  FileLock(const FileLock&);
-  void operator=(const FileLock&);
 };
 
-// Log the specified data to *info_log if info_log is non-NULL.
+// Log the specified data to *info_log if info_log is non-null.
-extern void Log(Logger* info_log, const char* format, ...)
+void Log(Logger* info_log, const char* format, ...)
-#   if defined(__GNUC__) || defined(__clang__)
+#if defined(__GNUC__) || defined(__clang__)
-    __attribute__((__format__ (__printf__, 2, 3)))
+    __attribute__((__format__(__printf__, 2, 3)))
-#   endif
+#endif
     ;
 
 // A utility routine: write "data" to the named file.
-extern Status WriteStringToFile(Env* env, const Slice& data,
+LEVELDB_EXPORT Status WriteStringToFile(Env* env, const Slice& data,
                                         const std::string& fname);
 
 // A utility routine: read contents of named file into *data
-extern Status ReadFileToString(Env* env, const std::string& fname,
+LEVELDB_EXPORT Status ReadFileToString(Env* env, const std::string& fname,
                                        std::string* data);
 
 // An implementation of Env that forwards all calls to another Env.
 // May be useful to clients who wish to override just part of the
 // functionality of another Env.
-class EnvWrapper : public Env {
+class LEVELDB_EXPORT EnvWrapper : public Env {
  public:
-  // Initialize an EnvWrapper that delegates all calls to *t
+  // Initialize an EnvWrapper that delegates all calls to *t.
-  explicit EnvWrapper(Env* t) : target_(t) { }
+  explicit EnvWrapper(Env* t) : target_(t) {}
   virtual ~EnvWrapper();
 
-  // Return the target to which this Env forwards all calls
+  // Return the target to which this Env forwards all calls.
   Env* target() const { return target_; }
 
-  // The following text is boilerplate that forwards all methods to target()
+  // The following text is boilerplate that forwards all methods to target().
-  Status NewSequentialFile(const std::string& f, SequentialFile** r) {
+  Status NewSequentialFile(const std::string& f, SequentialFile** r) override {
     return target_->NewSequentialFile(f, r);
   }
-  Status NewRandomAccessFile(const std::string& f, RandomAccessFile** r) {
+  Status NewRandomAccessFile(const std::string& f,
+                             RandomAccessFile** r) override {
     return target_->NewRandomAccessFile(f, r);
   }
-  Status NewWritableFile(const std::string& f, WritableFile** r) {
+  Status NewWritableFile(const std::string& f, WritableFile** r) override {
     return target_->NewWritableFile(f, r);
   }
-  Status NewAppendableFile(const std::string& f, WritableFile** r) {
+  Status NewAppendableFile(const std::string& f, WritableFile** r) override {
     return target_->NewAppendableFile(f, r);
   }
-  bool FileExists(const std::string& f) { return target_->FileExists(f); }
+  bool FileExists(const std::string& f) override {
-  Status GetChildren(const std::string& dir, std::vector<std::string>* r) {
+    return target_->FileExists(f);
+  }
+  Status GetChildren(const std::string& dir,
+                     std::vector<std::string>* r) override {
     return target_->GetChildren(dir, r);
   }
-  Status DeleteFile(const std::string& f) { return target_->DeleteFile(f); }
+  Status DeleteFile(const std::string& f) override {
-  Status CreateDir(const std::string& d) { return target_->CreateDir(d); }
+    return target_->DeleteFile(f);
-  Status DeleteDir(const std::string& d) { return target_->DeleteDir(d); }
+  }
-  Status GetFileSize(const std::string& f, uint64_t* s) {
+  Status CreateDir(const std::string& d) override {
+    return target_->CreateDir(d);
+  }
+  Status DeleteDir(const std::string& d) override {
+    return target_->DeleteDir(d);
+  }
+  Status GetFileSize(const std::string& f, uint64_t* s) override {
     return target_->GetFileSize(f, s);
   }
-  Status RenameFile(const std::string& s, const std::string& t) {
+  Status RenameFile(const std::string& s, const std::string& t) override {
     return target_->RenameFile(s, t);
   }
-  Status LockFile(const std::string& f, FileLock** l) {
+  Status LockFile(const std::string& f, FileLock** l) override {
     return target_->LockFile(f, l);
   }
-  Status UnlockFile(FileLock* l) { return target_->UnlockFile(l); }
+  Status UnlockFile(FileLock* l) override { return target_->UnlockFile(l); }
-  void Schedule(void (*f)(void*), void* a) {
+  void Schedule(void (*f)(void*), void* a) override {
     return target_->Schedule(f, a);
   }
-  void StartThread(void (*f)(void*), void* a) {
+  void StartThread(void (*f)(void*), void* a) override {
     return target_->StartThread(f, a);
   }
-  virtual Status GetTestDirectory(std::string* path) {
+  Status GetTestDirectory(std::string* path) override {
     return target_->GetTestDirectory(path);
   }
-  virtual Status NewLogger(const std::string& fname, Logger** result) {
+  Status NewLogger(const std::string& fname, Logger** result) override {
     return target_->NewLogger(fname, result);
   }
-  uint64_t NowMicros() {
+  uint64_t NowMicros() override { return target_->NowMicros(); }
-    return target_->NowMicros();
+  void SleepForMicroseconds(int micros) override {
-  }
-  void SleepForMicroseconds(int micros) {
     target_->SleepForMicroseconds(micros);
   }
+
  private:
   Env* target_;
 };
 
 }  // namespace leveldb
 
+// Redefine DeleteFile if necessary.
+#if defined(_WIN32) && defined(LEVELDB_DELETEFILE_UNDEFINED)
+#if defined(UNICODE)
+#define DeleteFile DeleteFileW
+#else
+#define DeleteFile DeleteFileA
+#endif  // defined(UNICODE)
+#endif  // defined(_WIN32) && defined(LEVELDB_DELETEFILE_UNDEFINED)
+
 #endif  // STORAGE_LEVELDB_INCLUDE_ENV_H_

include/leveldb/export.h

@@ -0,0 +1,33 @@
+// Copyright (c) 2017 The LevelDB Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+
+#ifndef STORAGE_LEVELDB_INCLUDE_EXPORT_H_
+#define STORAGE_LEVELDB_INCLUDE_EXPORT_H_
+
+#if !defined(LEVELDB_EXPORT)
+
+#if defined(LEVELDB_SHARED_LIBRARY)
+#if defined(_WIN32)
+
+#if defined(LEVELDB_COMPILE_LIBRARY)
+#define LEVELDB_EXPORT __declspec(dllexport)
+#else
+#define LEVELDB_EXPORT __declspec(dllimport)
+#endif  // defined(LEVELDB_COMPILE_LIBRARY)
+
+#else  // defined(_WIN32)
+#if defined(LEVELDB_COMPILE_LIBRARY)
+#define LEVELDB_EXPORT __attribute__((visibility("default")))
+#else
+#define LEVELDB_EXPORT
+#endif
+#endif  // defined(_WIN32)
+
+#else  // defined(LEVELDB_SHARED_LIBRARY)
+#define LEVELDB_EXPORT
+#endif
+
+#endif  // !defined(LEVELDB_EXPORT)
+
+#endif  // STORAGE_LEVELDB_INCLUDE_EXPORT_H_

include/leveldb/filter_policy.h

@@ -18,11 +18,13 @@
 
 #include <string>
 
+#include "leveldb/export.h"
+
 namespace leveldb {
 
 class Slice;
 
-class FilterPolicy {
+class LEVELDB_EXPORT FilterPolicy {
  public:
   virtual ~FilterPolicy();
 
@@ -38,8 +40,8 @@ class FilterPolicy {
   //
   // Warning: do not change the initial contents of *dst.  Instead,
   // append the newly constructed filter to *dst.
-  virtual void CreateFilter(const Slice* keys, int n, std::string* dst)
+  virtual void CreateFilter(const Slice* keys, int n,
-      const = 0;
+                            std::string* dst) const = 0;
 
   // "filter" contains the data appended by a preceding call to
   // CreateFilter() on this class.  This method must return true if
@@ -63,8 +65,8 @@ class FilterPolicy {
 // ignores trailing spaces, it would be incorrect to use a
 // FilterPolicy (like NewBloomFilterPolicy) that does not ignore
 // trailing spaces in keys.
-extern const FilterPolicy* NewBloomFilterPolicy(int bits_per_key);
+LEVELDB_EXPORT const FilterPolicy* NewBloomFilterPolicy(int bits_per_key);
 
-}
+}  // namespace leveldb
 
 #endif  // STORAGE_LEVELDB_INCLUDE_FILTER_POLICY_H_

include/leveldb/iterator.h

@@ -15,14 +15,19 @@
 #ifndef STORAGE_LEVELDB_INCLUDE_ITERATOR_H_
 #define STORAGE_LEVELDB_INCLUDE_ITERATOR_H_
 
+#include "leveldb/export.h"
 #include "leveldb/slice.h"
 #include "leveldb/status.h"
 
 namespace leveldb {
 
-class Iterator {
+class LEVELDB_EXPORT Iterator {
  public:
   Iterator();
+
+  Iterator(const Iterator&) = delete;
+  Iterator& operator=(const Iterator&) = delete;
+
   virtual ~Iterator();
 
   // An iterator is either positioned at a key/value pair, or
@@ -72,28 +77,35 @@ class Iterator {
   //
   // Note that unlike all of the preceding methods, this method is
   // not abstract and therefore clients should not override it.
-  typedef void (*CleanupFunction)(void* arg1, void* arg2);
+  using CleanupFunction = void (*)(void* arg1, void* arg2);
   void RegisterCleanup(CleanupFunction function, void* arg1, void* arg2);
 
  private:
-  struct Cleanup {
+  // Cleanup functions are stored in a single-linked list.
+  // The list's head node is inlined in the iterator.
+  struct CleanupNode {
+    // True if the node is not used. Only head nodes might be unused.
+    bool IsEmpty() const { return function == nullptr; }
+    // Invokes the cleanup function.
+    void Run() {
+      assert(function != nullptr);
+      (*function)(arg1, arg2);
+    }
+
+    // The head node is used if the function pointer is not null.
     CleanupFunction function;
     void* arg1;
     void* arg2;
-    Cleanup* next;
+    CleanupNode* next;
   };
-  Cleanup cleanup_;
+  CleanupNode cleanup_head_;
-
-  // No copying allowed
-  Iterator(const Iterator&);
-  void operator=(const Iterator&);
 };
 
 // Return an empty iterator (yields nothing).
-extern Iterator* NewEmptyIterator();
+LEVELDB_EXPORT Iterator* NewEmptyIterator();
 
 // Return an empty iterator with the specified status.
-extern Iterator* NewErrorIterator(const Status& status);
+LEVELDB_EXPORT Iterator* NewErrorIterator(const Status& status);
 
 }  // namespace leveldb
 

include/leveldb/options.h

@@ -7,6 +7,8 @@
 
 #include <stddef.h>
 
+#include "leveldb/export.h"
+
 namespace leveldb {
 
 class Cache;
@@ -28,7 +30,10 @@ enum CompressionType {
 };
 
 // Options to control the behavior of a database (passed to DB::Open)
-struct Options {
+struct LEVELDB_EXPORT Options {
+  // Create an Options object with default values for all fields.
+  Options();
+
   // -------------------
   // Parameters that affect behavior
 
@@ -41,20 +46,17 @@ struct Options {
   const Comparator* comparator;
 
   // If true, the database will be created if it is missing.
-  // Default: false
+  bool create_if_missing = false;
-  bool create_if_missing;
 
   // If true, an error is raised if the database already exists.
-  // Default: false
+  bool error_if_exists = false;
-  bool error_if_exists;
 
   // If true, the implementation will do aggressive checking of the
   // data it is processing and will stop early if it detects any
   // errors.  This may have unforeseen ramifications: for example, a
   // corruption of one DB entry may cause a large number of entries to
   // become unreadable or for the entire DB to become unopenable.
-  // Default: false
+  bool paranoid_checks = false;
-  bool paranoid_checks;
 
   // Use the specified object to interact with the environment,
   // e.g. to read/write files, schedule background work, etc.
@@ -62,10 +64,9 @@ struct Options {
   Env* env;
 
   // Any internal progress/error information generated by the db will
-  // be written to info_log if it is non-NULL, or to a file stored
+  // be written to info_log if it is non-null, or to a file stored
-  // in the same directory as the DB contents if info_log is NULL.
+  // in the same directory as the DB contents if info_log is null.
-  // Default: NULL
+  Logger* info_log = nullptr;
-  Logger* info_log;
 
   // -------------------
   // Parameters that affect performance
@@ -78,39 +79,30 @@ struct Options {
   // so you may wish to adjust this parameter to control memory usage.
   // Also, a larger write buffer will result in a longer recovery time
   // the next time the database is opened.
-  //
+  size_t write_buffer_size = 4 * 1024 * 1024;
-  // Default: 4MB
-  size_t write_buffer_size;
 
   // Number of open files that can be used by the DB.  You may need to
   // increase this if your database has a large working set (budget
   // one open file per 2MB of working set).
-  //
+  int max_open_files = 1000;
-  // Default: 1000
-  int max_open_files;
 
   // Control over blocks (user data is stored in a set of blocks, and
   // a block is the unit of reading from disk).
 
-  // If non-NULL, use the specified cache for blocks.
+  // If non-null, use the specified cache for blocks.
-  // If NULL, leveldb will automatically create and use an 8MB internal cache.
+  // If null, leveldb will automatically create and use an 8MB internal cache.
-  // Default: NULL
+  Cache* block_cache = nullptr;
-  Cache* block_cache;
 
   // Approximate size of user data packed per block.  Note that the
   // block size specified here corresponds to uncompressed data.  The
   // actual size of the unit read from disk may be smaller if
   // compression is enabled.  This parameter can be changed dynamically.
-  //
+  size_t block_size = 4 * 1024;
-  // Default: 4K
-  size_t block_size;
 
   // Number of keys between restart points for delta encoding of keys.
   // This parameter can be changed dynamically.  Most clients should
   // leave this parameter alone.
-  //
+  int block_restart_interval = 16;
-  // Default: 16
-  int block_restart_interval;
 
   // Leveldb will write up to this amount of bytes to a file before
   // switching to a new one.
@@ -120,9 +112,7 @@ struct Options {
   // compactions and hence longer latency/performance hiccups.
   // Another reason to increase this parameter might be when you are
   // initially populating a large database.
-  //
+  size_t max_file_size = 2 * 1024 * 1024;
-  // Default: 2MB
-  size_t max_file_size;
 
   // Compress blocks using the specified compression algorithm.  This
   // parameter can be changed dynamically.
@@ -138,53 +128,43 @@ struct Options {
   // worth switching to kNoCompression.  Even if the input data is
   // incompressible, the kSnappyCompression implementation will
   // efficiently detect that and will switch to uncompressed mode.
-  CompressionType compression;
+  CompressionType compression = kSnappyCompression;
 
   // EXPERIMENTAL: If true, append to existing MANIFEST and log files
   // when a database is opened.  This can significantly speed up open.
   //
   // Default: currently false, but may become true later.
-  bool reuse_logs;
+  bool reuse_logs = false;
 
-  // If non-NULL, use the specified filter policy to reduce disk reads.
+  // If non-null, use the specified filter policy to reduce disk reads.
   // Many applications will benefit from passing the result of
   // NewBloomFilterPolicy() here.
-  //
+  const FilterPolicy* filter_policy = nullptr;
-  // Default: NULL
-  const FilterPolicy* filter_policy;
-
-  // Create an Options object with default values for all fields.
-  Options();
 };
 
 // Options that control read operations
-struct ReadOptions {
+struct LEVELDB_EXPORT ReadOptions {
+  ReadOptions() = default;
+
   // If true, all data read from underlying storage will be
   // verified against corresponding checksums.
-  // Default: false
+  bool verify_checksums = false;
-  bool verify_checksums;
 
   // Should the data read for this iteration be cached in memory?
   // Callers may wish to set this field to false for bulk scans.
-  // Default: true
+  bool fill_cache = true;
-  bool fill_cache;
 
-  // If "snapshot" is non-NULL, read as of the supplied snapshot
+  // If "snapshot" is non-null, read as of the supplied snapshot
   // (which must belong to the DB that is being read and which must
-  // not have been released).  If "snapshot" is NULL, use an implicit
+  // not have been released).  If "snapshot" is null, use an implicit
   // snapshot of the state at the beginning of this read operation.
-  // Default: NULL
+  const Snapshot* snapshot = nullptr;
-  const Snapshot* snapshot;
-
-  ReadOptions()
-      : verify_checksums(false),
-        fill_cache(true),
-        snapshot(NULL) {
-  }
 };
 
 // Options that control write operations
-struct WriteOptions {
+struct LEVELDB_EXPORT WriteOptions {
+  WriteOptions() = default;
+
   // If true, the write will be flushed from the operating system
   // buffer cache (by calling WritableFile::Sync()) before the write
   // is considered complete.  If this flag is true, writes will be
@@ -199,13 +179,7 @@ struct WriteOptions {
   // crash semantics as the "write()" system call.  A DB write
   // with sync==true has similar crash semantics to a "write()"
   // system call followed by "fsync()".
-  //
+  bool sync = false;
-  // Default: false
-  bool sync;
-
-  WriteOptions()
-      : sync(false) {
-  }
 };
 
 }  // namespace leveldb

include/leveldb/slice.h

@@ -18,23 +18,30 @@
 #include <assert.h>
 #include <stddef.h>
 #include <string.h>
+
 #include <string>
 
+#include "leveldb/export.h"
+
 namespace leveldb {
 
-class Slice {
+class LEVELDB_EXPORT Slice {
  public:
   // Create an empty slice.
-  Slice() : data_(""), size_(0) { }
+  Slice() : data_(""), size_(0) {}
 
   // Create a slice that refers to d[0,n-1].
-  Slice(const char* d, size_t n) : data_(d), size_(n) { }
+  Slice(const char* d, size_t n) : data_(d), size_(n) {}
 
   // Create a slice that refers to the contents of "s"
-  Slice(const std::string& s) : data_(s.data()), size_(s.size()) { }
+  Slice(const std::string& s) : data_(s.data()), size_(s.size()) {}
 
   // Create a slice that refers to s[0,strlen(s)-1]
-  Slice(const char* s) : data_(s), size_(strlen(s)) { }
+  Slice(const char* s) : data_(s), size_(strlen(s)) {}
+
+  // Intentionally copyable.
+  Slice(const Slice&) = default;
+  Slice& operator=(const Slice&) = default;
 
   // Return a pointer to the beginning of the referenced data
   const char* data() const { return data_; }
@@ -53,7 +60,10 @@ class Slice {
   }
 
   // Change this slice to refer to an empty array
-  void clear() { data_ = ""; size_ = 0; }
+  void clear() {
+    data_ = "";
+    size_ = 0;
+  }
 
   // Drop the first "n" bytes from this slice.
   void remove_prefix(size_t n) {
@@ -73,15 +83,12 @@ class Slice {
 
   // Return true iff "x" is a prefix of "*this"
   bool starts_with(const Slice& x) const {
-    return ((size_ >= x.size_) &&
+    return ((size_ >= x.size_) && (memcmp(data_, x.data_, x.size_) == 0));
-            (memcmp(data_, x.data_, x.size_) == 0));
   }
 
  private:
   const char* data_;
   size_t size_;
-
-  // Intentionally copyable
 };
 
 inline bool operator==(const Slice& x, const Slice& y) {
@@ -89,21 +96,20 @@ inline bool operator==(const Slice& x, const Slice& y) {
           (memcmp(x.data(), y.data(), x.size()) == 0));
 }
 
-inline bool operator!=(const Slice& x, const Slice& y) {
+inline bool operator!=(const Slice& x, const Slice& y) { return !(x == y); }
-  return !(x == y);
-}
 
 inline int Slice::compare(const Slice& b) const {
   const size_t min_len = (size_ < b.size_) ? size_ : b.size_;
   int r = memcmp(data_, b.data_, min_len);
   if (r == 0) {
-    if (size_ < b.size_) r = -1;
+    if (size_ < b.size_)
-    else if (size_ > b.size_) r = +1;
+      r = -1;
+    else if (size_ > b.size_)
+      r = +1;
   }
   return r;
 }
 
 }  // namespace leveldb
 
-
 #endif  // STORAGE_LEVELDB_INCLUDE_SLICE_H_

include/leveldb/status.h

@@ -13,20 +13,25 @@
 #ifndef STORAGE_LEVELDB_INCLUDE_STATUS_H_
 #define STORAGE_LEVELDB_INCLUDE_STATUS_H_
 
+#include <algorithm>
 #include <string>
+
+#include "leveldb/export.h"
 #include "leveldb/slice.h"
 
 namespace leveldb {
 
-class Status {
+class LEVELDB_EXPORT Status {
  public:
   // Create a success status.
-  Status() : state_(NULL) { }
+  Status() noexcept : state_(nullptr) {}
   ~Status() { delete[] state_; }
 
-  // Copy the specified status.
+  Status(const Status& rhs);
-  Status(const Status& s);
+  Status& operator=(const Status& rhs);
-  void operator=(const Status& s);
+
+  Status(Status&& rhs) noexcept : state_(rhs.state_) { rhs.state_ = nullptr; }
+  Status& operator=(Status&& rhs) noexcept;
 
   // Return a success status.
   static Status OK() { return Status(); }
@@ -49,7 +54,7 @@ class Status {
   }
 
   // Returns true iff the status indicates success.
-  bool ok() const { return (state_ == NULL); }
+  bool ok() const { return (state_ == nullptr); }
 
   // Returns true iff the status indicates a NotFound error.
   bool IsNotFound() const { return code() == kNotFound; }
@@ -71,13 +76,6 @@ class Status {
   std::string ToString() const;
 
  private:
-  // OK status has a NULL state_.  Otherwise, state_ is a new[] array
-  // of the following form:
-  //    state_[0..3] == length of message
-  //    state_[4]    == code
-  //    state_[5..]  == message
-  const char* state_;
-
   enum Code {
     kOk = 0,
     kNotFound = 1,
@@ -88,23 +86,35 @@ class Status {
   };
 
   Code code() const {
-    return (state_ == NULL) ? kOk : static_cast<Code>(state_[4]);
+    return (state_ == nullptr) ? kOk : static_cast<Code>(state_[4]);
   }
 
   Status(Code code, const Slice& msg, const Slice& msg2);
   static const char* CopyState(const char* s);
+
+  // OK status has a null state_.  Otherwise, state_ is a new[] array
+  // of the following form:
+  //    state_[0..3] == length of message
+  //    state_[4]    == code
+  //    state_[5..]  == message
+  const char* state_;
 };
 
-inline Status::Status(const Status& s) {
+inline Status::Status(const Status& rhs) {
-  state_ = (s.state_ == NULL) ? NULL : CopyState(s.state_);
+  state_ = (rhs.state_ == nullptr) ? nullptr : CopyState(rhs.state_);
 }
-inline void Status::operator=(const Status& s) {
+inline Status& Status::operator=(const Status& rhs) {
-  // The following condition catches both aliasing (when this == &s),
+  // The following condition catches both aliasing (when this == &rhs),
-  // and the common case where both s and *this are ok.
+  // and the common case where both rhs and *this are ok.
-  if (state_ != s.state_) {
+  if (state_ != rhs.state_) {
     delete[] state_;
-    state_ = (s.state_ == NULL) ? NULL : CopyState(s.state_);
+    state_ = (rhs.state_ == nullptr) ? nullptr : CopyState(rhs.state_);
   }
+  return *this;
+}
+inline Status& Status::operator=(Status&& rhs) noexcept {
+  std::swap(state_, rhs.state_);
+  return *this;
 }
 
 }  // namespace leveldb

include/leveldb/table.h

@@ -6,6 +6,8 @@
 #define STORAGE_LEVELDB_INCLUDE_TABLE_H_
 
 #include <stdint.h>
+
+#include "leveldb/export.h"
 #include "leveldb/iterator.h"
 
 namespace leveldb {
@@ -21,7 +23,7 @@ class TableCache;
 // A Table is a sorted map from strings to strings.  Tables are
 // immutable and persistent.  A Table may be safely accessed from
 // multiple threads without external synchronization.
-class Table {
+class LEVELDB_EXPORT Table {
  public:
   // Attempt to open the table that is stored in bytes [0..file_size)
   // of "file", and read the metadata entries necessary to allow
@@ -30,15 +32,16 @@ class Table {
   // If successful, returns ok and sets "*table" to the newly opened
   // table.  The client should delete "*table" when no longer needed.
   // If there was an error while initializing the table, sets "*table"
-  // to NULL and returns a non-ok status.  Does not take ownership of
+  // to nullptr and returns a non-ok status.  Does not take ownership of
   // "*source", but the client must ensure that "source" remains live
   // for the duration of the returned table's lifetime.
   //
   // *file must remain live while this Table is in use.
-  static Status Open(const Options& options,
+  static Status Open(const Options& options, RandomAccessFile* file,
-                     RandomAccessFile* file,
+                     uint64_t file_size, Table** table);
-                     uint64_t file_size,
+
-                     Table** table);
+  Table(const Table&) = delete;
+  Table& operator=(const Table&) = delete;
 
   ~Table();
 
@@ -56,28 +59,24 @@ class Table {
   uint64_t ApproximateOffsetOf(const Slice& key) const;
 
  private:
+  friend class TableCache;
   struct Rep;
-  Rep* rep_;
 
-  explicit Table(Rep* rep) { rep_ = rep; }
   static Iterator* BlockReader(void*, const ReadOptions&, const Slice&);
 
+  explicit Table(Rep* rep) : rep_(rep) {}
+
   // Calls (*handle_result)(arg, ...) with the entry found after a call
   // to Seek(key).  May not make such a call if filter policy says
   // that key is not present.
-  friend class TableCache;
+  Status InternalGet(const ReadOptions&, const Slice& key, void* arg,
-  Status InternalGet(
+                     void (*handle_result)(void* arg, const Slice& k,
-      const ReadOptions&, const Slice& key,
+                                           const Slice& v));
-      void* arg,
-      void (*handle_result)(void* arg, const Slice& k, const Slice& v));
-
 
   void ReadMeta(const Footer& footer);
   void ReadFilter(const Slice& filter_handle_value);
 
-  // No copying allowed
+  Rep* const rep_;
-  Table(const Table&);
-  void operator=(const Table&);
 };
 
 }  // namespace leveldb

include/leveldb/table_builder.h

@@ -14,6 +14,8 @@
 #define STORAGE_LEVELDB_INCLUDE_TABLE_BUILDER_H_
 
 #include <stdint.h>
+
+#include "leveldb/export.h"
 #include "leveldb/options.h"
 #include "leveldb/status.h"
 
@@ -23,13 +25,16 @@ class BlockBuilder;
 class BlockHandle;
 class WritableFile;
 
-class TableBuilder {
+class LEVELDB_EXPORT TableBuilder {
  public:
   // Create a builder that will store the contents of the table it is
   // building in *file.  Does not close the file.  It is up to the
   // caller to close the file after calling Finish().
   TableBuilder(const Options& options, WritableFile* file);
 
+  TableBuilder(const TableBuilder&) = delete;
+  TableBuilder& operator=(const TableBuilder&) = delete;
+
   // REQUIRES: Either Finish() or Abandon() has been called.
   ~TableBuilder();
 
@@ -81,10 +86,6 @@ class TableBuilder {
 
   struct Rep;
   Rep* rep_;
-
-  // No copying allowed
-  TableBuilder(const TableBuilder&);
-  void operator=(const TableBuilder&);
 };
 
 }  // namespace leveldb

include/leveldb/write_batch.h

@@ -22,15 +22,29 @@
 #define STORAGE_LEVELDB_INCLUDE_WRITE_BATCH_H_
 
 #include <string>
+
+#include "leveldb/export.h"
 #include "leveldb/status.h"
 
 namespace leveldb {
 
 class Slice;
 
-class WriteBatch {
+class LEVELDB_EXPORT WriteBatch {
  public:
+  class LEVELDB_EXPORT Handler {
+   public:
+    virtual ~Handler();
+    virtual void Put(const Slice& key, const Slice& value) = 0;
+    virtual void Delete(const Slice& key) = 0;
+  };
+
   WriteBatch();
+
+  // Intentionally copyable.
+  WriteBatch(const WriteBatch&) = default;
+  WriteBatch& operator=(const WriteBatch&) = default;
+
   ~WriteBatch();
 
   // Store the mapping "key->value" in the database.
@@ -42,21 +56,26 @@ class WriteBatch {
   // Clear all updates buffered in this batch.
   void Clear();
 
+  // The size of the database changes caused by this batch.
+  //
+  // This number is tied to implementation details, and may change across
+  // releases. It is intended for LevelDB usage metrics.
+  size_t ApproximateSize() const;
+
+  // Copies the operations in "source" to this batch.
+  //
+  // This runs in O(source size) time. However, the constant factor is better
+  // than calling Iterate() over the source batch with a Handler that replicates
+  // the operations into this batch.
+  void Append(const WriteBatch& source);
+
   // Support for iterating over the contents of a batch.
-  class Handler {
-   public:
-    virtual ~Handler();
-    virtual void Put(const Slice& key, const Slice& value) = 0;
-    virtual void Delete(const Slice& key) = 0;
-  };
   Status Iterate(Handler* handler) const;
 
  private:
   friend class WriteBatchInternal;
 
   std::string rep_;  // See comment in write_batch.cc for the format of rep_
-
-  // Intentionally copyable
 };
 
 }  // namespace leveldb

issues/issue178_test.cc

@@ -3,9 +3,9 @@
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 
 // Test for issue 178: a manual compaction causes deleted data to reappear.
+#include <cstdlib>
 #include <iostream>
 #include <sstream>
-#include <cstdlib>
 
 #include "leveldb/db.h"
 #include "leveldb/write_batch.h"
@@ -21,11 +21,9 @@ std::string Key1(int i) {
   return buf;
 }
 
-std::string Key2(int i) {
+std::string Key2(int i) { return Key1(i) + "_xxx"; }
-  return Key1(i) + "_xxx";
-}
 
-class Issue178 { };
+class Issue178 {};
 
 TEST(Issue178, Test) {
   // Get rid of any state from an old run.
@@ -87,6 +85,4 @@ TEST(Issue178, Test) {
 
 }  // anonymous namespace
 
-int main(int argc, char** argv) {
+int main(int argc, char** argv) { return leveldb::test::RunAllTests(); }
-  return leveldb::test::RunAllTests();
-}

issues/issue200_test.cc

@@ -11,14 +11,14 @@
 
 namespace leveldb {
 
-class Issue200 { };
+class Issue200 {};
 
 TEST(Issue200, Test) {
   // Get rid of any state from an old run.
   std::string dbpath = test::TmpDir() + "/leveldb_issue200_test";
   DestroyDB(dbpath, Options());
 
-  DB *db;
+  DB* db;
   Options options;
   options.create_if_missing = true;
   ASSERT_OK(DB::Open(options, dbpath, &db));
@@ -31,7 +31,7 @@ TEST(Issue200, Test) {
   ASSERT_OK(db->Put(write_options, "5", "f"));
 
   ReadOptions read_options;
-  Iterator *iter = db->NewIterator(read_options);
+  Iterator* iter = db->NewIterator(read_options);
 
   // Add an element that should not be reflected in the iterator.
   ASSERT_OK(db->Put(write_options, "25", "cd"));
@@ -54,6 +54,4 @@ TEST(Issue200, Test) {
 
 }  // namespace leveldb
 
-int main(int argc, char** argv) {
+int main(int argc, char** argv) { return leveldb::test::RunAllTests(); }
-  return leveldb::test::RunAllTests();
-}

issues/issue320_test.cc

@@ -0,0 +1,128 @@
+// Copyright (c) 2019 The LevelDB Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+
+#include <cstdint>
+#include <cstdlib>
+#include <iostream>
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "leveldb/db.h"
+#include "leveldb/write_batch.h"
+#include "util/testharness.h"
+
+namespace leveldb {
+
+namespace {
+
+// Creates a random number in the range of [0, max).
+int GenerateRandomNumber(int max) { return std::rand() % max; }
+
+std::string CreateRandomString(int32_t index) {
+  static const size_t len = 1024;
+  char bytes[len];
+  size_t i = 0;
+  while (i < 8) {
+    bytes[i] = 'a' + ((index >> (4 * i)) & 0xf);
+    ++i;
+  }
+  while (i < sizeof(bytes)) {
+    bytes[i] = 'a' + GenerateRandomNumber(26);
+    ++i;
+  }
+  return std::string(bytes, sizeof(bytes));
+}
+
+}  // namespace
+
+class Issue320 {};
+
+TEST(Issue320, Test) {
+  std::srand(0);
+
+  bool delete_before_put = false;
+  bool keep_snapshots = true;
+
+  std::vector<std::unique_ptr<std::pair<std::string, std::string>>> test_map(
+      10000);
+  std::vector<Snapshot const*> snapshots(100, nullptr);
+
+  DB* db;
+  Options options;
+  options.create_if_missing = true;
+
+  std::string dbpath = test::TmpDir() + "/leveldb_issue320_test";
+  ASSERT_OK(DB::Open(options, dbpath, &db));
+
+  uint32_t target_size = 10000;
+  uint32_t num_items = 0;
+  uint32_t count = 0;
+  std::string key;
+  std::string value, old_value;
+
+  WriteOptions writeOptions;
+  ReadOptions readOptions;
+  while (count < 200000) {
+    if ((++count % 1000) == 0) {
+      std::cout << "count: " << count << std::endl;
+    }
+
+    int index = GenerateRandomNumber(test_map.size());
+    WriteBatch batch;
+
+    if (test_map[index] == nullptr) {
+      num_items++;
+      test_map[index].reset(new std::pair<std::string, std::string>(
+          CreateRandomString(index), CreateRandomString(index)));
+      batch.Put(test_map[index]->first, test_map[index]->second);
+    } else {
+      ASSERT_OK(db->Get(readOptions, test_map[index]->first, &old_value));
+      if (old_value != test_map[index]->second) {
+        std::cout << "ERROR incorrect value returned by Get" << std::endl;
+        std::cout << "  count=" << count << std::endl;
+        std::cout << "  old value=" << old_value << std::endl;
+        std::cout << "  test_map[index]->second=" << test_map[index]->second
+                  << std::endl;
+        std::cout << "  test_map[index]->first=" << test_map[index]->first
+                  << std::endl;
+        std::cout << "  index=" << index << std::endl;
+        ASSERT_EQ(old_value, test_map[index]->second);
+      }
+
+      if (num_items >= target_size && GenerateRandomNumber(100) > 30) {
+        batch.Delete(test_map[index]->first);
+        test_map[index] = nullptr;
+        --num_items;
+      } else {
+        test_map[index]->second = CreateRandomString(index);
+        if (delete_before_put) batch.Delete(test_map[index]->first);
+        batch.Put(test_map[index]->first, test_map[index]->second);
+      }
+    }
+
+    ASSERT_OK(db->Write(writeOptions, &batch));
+
+    if (keep_snapshots && GenerateRandomNumber(10) == 0) {
+      int i = GenerateRandomNumber(snapshots.size());
+      if (snapshots[i] != nullptr) {
+        db->ReleaseSnapshot(snapshots[i]);
+      }
+      snapshots[i] = db->GetSnapshot();
+    }
+  }
+
+  for (Snapshot const* snapshot : snapshots) {
+    if (snapshot) {
+      db->ReleaseSnapshot(snapshot);
+    }
+  }
+
+  delete db;
+  DestroyDB(dbpath, options);
+}
+
+}  // namespace leveldb
+
+int main(int argc, char** argv) { return leveldb::test::RunAllTests(); }

port/README.md

@@ -5,6 +5,6 @@ Code in the rest of the package includes "port.h" from this directory.
 "port.h" in turn includes a platform specific "port_<platform>.h" file
 that provides the platform specific implementation.
 
-See port_posix.h for an example of what must be provided in a platform
+See port_stdcxx.h for an example of what must be provided in a platform
 specific header file.
 

port/atomic_pointer.h

@@ -1,245 +0,0 @@
-// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file. See the AUTHORS file for names of contributors.
-
-// AtomicPointer provides storage for a lock-free pointer.
-// Platform-dependent implementation of AtomicPointer:
-// - If the platform provides a cheap barrier, we use it with raw pointers
-// - If <atomic> is present (on newer versions of gcc, it is), we use
-//   a <atomic>-based AtomicPointer.  However we prefer the memory
-//   barrier based version, because at least on a gcc 4.4 32-bit build
-//   on linux, we have encountered a buggy <atomic> implementation.
-//   Also, some <atomic> implementations are much slower than a memory-barrier
-//   based implementation (~16ns for <atomic> based acquire-load vs. ~1ns for
-//   a barrier based acquire-load).
-// This code is based on atomicops-internals-* in Google's perftools:
-// http://code.google.com/p/google-perftools/source/browse/#svn%2Ftrunk%2Fsrc%2Fbase
-
-#ifndef PORT_ATOMIC_POINTER_H_
-#define PORT_ATOMIC_POINTER_H_
-
-#include <stdint.h>
-#ifdef LEVELDB_ATOMIC_PRESENT
-#include <atomic>
-#endif
-#ifdef OS_WIN
-#include <windows.h>
-#endif
-#ifdef OS_MACOSX
-#include <libkern/OSAtomic.h>
-#endif
-
-#if defined(_M_X64) || defined(__x86_64__)
-#define ARCH_CPU_X86_FAMILY 1
-#elif defined(_M_IX86) || defined(__i386__) || defined(__i386)
-#define ARCH_CPU_X86_FAMILY 1
-#elif defined(__ARMEL__)
-#define ARCH_CPU_ARM_FAMILY 1
-#elif defined(__aarch64__)
-#define ARCH_CPU_ARM64_FAMILY 1
-#elif defined(__ppc__) || defined(__powerpc__) || defined(__powerpc64__)
-#define ARCH_CPU_PPC_FAMILY 1
-#elif defined(__mips__)
-#define ARCH_CPU_MIPS_FAMILY 1
-#endif
-
-namespace leveldb {
-namespace port {
-
-// AtomicPointer based on <cstdatomic> if available
-#if defined(LEVELDB_ATOMIC_PRESENT)
-class AtomicPointer {
- private:
-  std::atomic<void*> rep_;
- public:
-  AtomicPointer() { }
-  explicit AtomicPointer(void* v) : rep_(v) { }
-  inline void* Acquire_Load() const {
-    return rep_.load(std::memory_order_acquire);
-  }
-  inline void Release_Store(void* v) {
-    rep_.store(v, std::memory_order_release);
-  }
-  inline void* NoBarrier_Load() const {
-    return rep_.load(std::memory_order_relaxed);
-  }
-  inline void NoBarrier_Store(void* v) {
-    rep_.store(v, std::memory_order_relaxed);
-  }
-};
-
-#else
-
-// Define MemoryBarrier() if available
-// Windows on x86
-#if defined(OS_WIN) && defined(COMPILER_MSVC) && defined(ARCH_CPU_X86_FAMILY)
-// windows.h already provides a MemoryBarrier(void) macro
-// http://msdn.microsoft.com/en-us/library/ms684208(v=vs.85).aspx
-#define LEVELDB_HAVE_MEMORY_BARRIER
-
-// Mac OS
-#elif defined(OS_MACOSX)
-inline void MemoryBarrier() {
-  OSMemoryBarrier();
-}
-#define LEVELDB_HAVE_MEMORY_BARRIER
-
-// Gcc on x86
-#elif defined(ARCH_CPU_X86_FAMILY) && defined(__GNUC__)
-inline void MemoryBarrier() {
-  // See http://gcc.gnu.org/ml/gcc/2003-04/msg01180.html for a discussion on
-  // this idiom. Also see http://en.wikipedia.org/wiki/Memory_ordering.
-  __asm__ __volatile__("" : : : "memory");
-}
-#define LEVELDB_HAVE_MEMORY_BARRIER
-
-// Sun Studio
-#elif defined(ARCH_CPU_X86_FAMILY) && defined(__SUNPRO_CC)
-inline void MemoryBarrier() {
-  // See http://gcc.gnu.org/ml/gcc/2003-04/msg01180.html for a discussion on
-  // this idiom. Also see http://en.wikipedia.org/wiki/Memory_ordering.
-  asm volatile("" : : : "memory");
-}
-#define LEVELDB_HAVE_MEMORY_BARRIER
-
-// ARM Linux
-#elif defined(ARCH_CPU_ARM_FAMILY) && defined(__linux__)
-typedef void (*LinuxKernelMemoryBarrierFunc)(void);
-// The Linux ARM kernel provides a highly optimized device-specific memory
-// barrier function at a fixed memory address that is mapped in every
-// user-level process.
-//
-// This beats using CPU-specific instructions which are, on single-core
-// devices, un-necessary and very costly (e.g. ARMv7-A "dmb" takes more
-// than 180ns on a Cortex-A8 like the one on a Nexus One). Benchmarking
-// shows that the extra function call cost is completely negligible on
-// multi-core devices.
-//
-inline void MemoryBarrier() {
-  (*(LinuxKernelMemoryBarrierFunc)0xffff0fa0)();
-}
-#define LEVELDB_HAVE_MEMORY_BARRIER
-
-// ARM64
-#elif defined(ARCH_CPU_ARM64_FAMILY)
-inline void MemoryBarrier() {
-  asm volatile("dmb sy" : : : "memory");
-}
-#define LEVELDB_HAVE_MEMORY_BARRIER
-
-// PPC
-#elif defined(ARCH_CPU_PPC_FAMILY) && defined(__GNUC__)
-inline void MemoryBarrier() {
-  // TODO for some powerpc expert: is there a cheaper suitable variant?
-  // Perhaps by having separate barriers for acquire and release ops.
-  asm volatile("sync" : : : "memory");
-}
-#define LEVELDB_HAVE_MEMORY_BARRIER
-
-// MIPS
-#elif defined(ARCH_CPU_MIPS_FAMILY) && defined(__GNUC__)
-inline void MemoryBarrier() {
-  __asm__ __volatile__("sync" : : : "memory");
-}
-#define LEVELDB_HAVE_MEMORY_BARRIER
-
-#endif
-
-// AtomicPointer built using platform-specific MemoryBarrier()
-#if defined(LEVELDB_HAVE_MEMORY_BARRIER)
-class AtomicPointer {
- private:
-  void* rep_;
- public:
-  AtomicPointer() { }
-  explicit AtomicPointer(void* p) : rep_(p) {}
-  inline void* NoBarrier_Load() const { return rep_; }
-  inline void NoBarrier_Store(void* v) { rep_ = v; }
-  inline void* Acquire_Load() const {
-    void* result = rep_;
-    MemoryBarrier();
-    return result;
-  }
-  inline void Release_Store(void* v) {
-    MemoryBarrier();
-    rep_ = v;
-  }
-};
-
-// Atomic pointer based on sparc memory barriers
-#elif defined(__sparcv9) && defined(__GNUC__)
-class AtomicPointer {
- private:
-  void* rep_;
- public:
-  AtomicPointer() { }
-  explicit AtomicPointer(void* v) : rep_(v) { }
-  inline void* Acquire_Load() const {
-    void* val;
-    __asm__ __volatile__ (
-        "ldx [%[rep_]], %[val] \n\t"
-         "membar #LoadLoad|#LoadStore \n\t"
-        : [val] "=r" (val)
-        : [rep_] "r" (&rep_)
-        : "memory");
-    return val;
-  }
-  inline void Release_Store(void* v) {
-    __asm__ __volatile__ (
-        "membar #LoadStore|#StoreStore \n\t"
-        "stx %[v], [%[rep_]] \n\t"
-        :
-        : [rep_] "r" (&rep_), [v] "r" (v)
-        : "memory");
-  }
-  inline void* NoBarrier_Load() const { return rep_; }
-  inline void NoBarrier_Store(void* v) { rep_ = v; }
-};
-
-// Atomic pointer based on ia64 acq/rel
-#elif defined(__ia64) && defined(__GNUC__)
-class AtomicPointer {
- private:
-  void* rep_;
- public:
-  AtomicPointer() { }
-  explicit AtomicPointer(void* v) : rep_(v) { }
-  inline void* Acquire_Load() const {
-    void* val    ;
-    __asm__ __volatile__ (
-        "ld8.acq %[val] = [%[rep_]] \n\t"
-        : [val] "=r" (val)
-        : [rep_] "r" (&rep_)
-        : "memory"
-        );
-    return val;
-  }
-  inline void Release_Store(void* v) {
-    __asm__ __volatile__ (
-        "st8.rel [%[rep_]] = %[v]  \n\t"
-        :
-        : [rep_] "r" (&rep_), [v] "r" (v)
-        : "memory"
-        );
-  }
-  inline void* NoBarrier_Load() const { return rep_; }
-  inline void NoBarrier_Store(void* v) { rep_ = v; }
-};
-
-// We have neither MemoryBarrier(), nor <atomic>
-#else
-#error Please implement AtomicPointer for this platform.
-
-#endif
-#endif
-
-#undef LEVELDB_HAVE_MEMORY_BARRIER
-#undef ARCH_CPU_X86_FAMILY
-#undef ARCH_CPU_ARM_FAMILY
-#undef ARCH_CPU_ARM64_FAMILY
-#undef ARCH_CPU_PPC_FAMILY
-
-}  // namespace port
-}  // namespace leveldb
-
-#endif  // PORT_ATOMIC_POINTER_H_

port/port.h

@@ -10,12 +10,10 @@
 // Include the appropriate platform specific file below.  If you are
 // porting to a new platform, see "port_example.h" for documentation
 // of what the new port_<platform>.h file must provide.
-#if defined(LEVELDB_PLATFORM_POSIX)
+#if defined(LEVELDB_PLATFORM_POSIX) || defined(LEVELDB_PLATFORM_WINDOWS)
-#  include "port/port_posix.h"
+#include "port/port_stdcxx.h"
 #elif defined(LEVELDB_PLATFORM_CHROMIUM)
-#  include "port/port_chromium.h"
+#include "port/port_chromium.h"
-#elif defined(LEVELDB_PLATFORM_WINDOWS)
-#  include "port/port_win.h"
 #endif
 
 #endif  // STORAGE_LEVELDB_PORT_PORT_H_

port/port_config.h.in

@@ -0,0 +1,39 @@
+// Copyright 2017 The LevelDB Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+
+#ifndef STORAGE_LEVELDB_PORT_PORT_CONFIG_H_
+#define STORAGE_LEVELDB_PORT_PORT_CONFIG_H_
+
+// Define to 1 if you have a definition for fdatasync() in <unistd.h>.
+#if !defined(HAVE_FDATASYNC)
+#cmakedefine01 HAVE_FDATASYNC
+#endif  // !defined(HAVE_FDATASYNC)
+
+// Define to 1 if you have a definition for F_FULLFSYNC in <fcntl.h>.
+#if !defined(HAVE_FULLFSYNC)
+#cmakedefine01 HAVE_FULLFSYNC
+#endif  // !defined(HAVE_FULLFSYNC)
+
+// Define to 1 if you have a definition for O_CLOEXEC in <fcntl.h>.
+#if !defined(HAVE_O_CLOEXEC)
+#cmakedefine01 HAVE_O_CLOEXEC
+#endif  // !defined(HAVE_O_CLOEXEC)
+
+// Define to 1 if you have Google CRC32C.
+#if !defined(HAVE_CRC32C)
+#cmakedefine01 HAVE_CRC32C
+#endif  // !defined(HAVE_CRC32C)
+
+// Define to 1 if you have Google Snappy.
+#if !defined(HAVE_SNAPPY)
+#cmakedefine01 HAVE_SNAPPY
+#endif  // !defined(HAVE_SNAPPY)
+
+// Define to 1 if your processor stores words with the most significant byte
+// first (like Motorola and SPARC, unlike Intel and VAX).
+#if !defined(LEVELDB_IS_BIG_ENDIAN)
+#cmakedefine01 LEVELDB_IS_BIG_ENDIAN
+#endif  // !defined(LEVELDB_IS_BIG_ENDIAN)
+
+#endif  // STORAGE_LEVELDB_PORT_PORT_CONFIG_H_

port/port_example.h

@@ -10,6 +10,8 @@
 #ifndef STORAGE_LEVELDB_PORT_PORT_EXAMPLE_H_
 #define STORAGE_LEVELDB_PORT_PORT_EXAMPLE_H_
 
+#include "port/thread_annotations.h"
+
 namespace leveldb {
 namespace port {
 
@@ -23,23 +25,23 @@ static const bool kLittleEndian = true /* or some other expression */;
 // ------------------ Threading -------------------
 
 // A Mutex represents an exclusive lock.
-class Mutex {
+class LOCKABLE Mutex {
  public:
   Mutex();
   ~Mutex();
 
   // Lock the mutex.  Waits until other lockers have exited.
   // Will deadlock if the mutex is already locked by this thread.
-  void Lock();
+  void Lock() EXCLUSIVE_LOCK_FUNCTION();
 
   // Unlock the mutex.
   // REQUIRES: This mutex was locked by this thread.
-  void Unlock();
+  void Unlock() UNLOCK_FUNCTION();
 
   // Optionally crash if this thread does not hold this mutex.
   // The implementation must be fast, especially if NDEBUG is
   // defined.  The implementation is allowed to skip all checks.
-  void AssertHeld();
+  void AssertHeld() ASSERT_EXCLUSIVE_LOCK();
 };
 
 class CondVar {
@@ -60,56 +62,17 @@ class CondVar {
   void SignallAll();
 };
 
-// Thread-safe initialization.
-// Used as follows:
-//      static port::OnceType init_control = LEVELDB_ONCE_INIT;
-//      static void Initializer() { ... do something ...; }
-//      ...
-//      port::InitOnce(&init_control, &Initializer);
-typedef intptr_t OnceType;
-#define LEVELDB_ONCE_INIT 0
-extern void InitOnce(port::OnceType*, void (*initializer)());
-
-// A type that holds a pointer that can be read or written atomically
-// (i.e., without word-tearing.)
-class AtomicPointer {
- private:
-  intptr_t rep_;
- public:
-  // Initialize to arbitrary value
-  AtomicPointer();
-
-  // Initialize to hold v
-  explicit AtomicPointer(void* v) : rep_(v) { }
-
-  // Read and return the stored pointer with the guarantee that no
-  // later memory access (read or write) by this thread can be
-  // reordered ahead of this read.
-  void* Acquire_Load() const;
-
-  // Set v as the stored pointer with the guarantee that no earlier
-  // memory access (read or write) by this thread can be reordered
-  // after this store.
-  void Release_Store(void* v);
-
-  // Read the stored pointer with no ordering guarantees.
-  void* NoBarrier_Load() const;
-
-  // Set va as the stored pointer with no ordering guarantees.
-  void NoBarrier_Store(void* v);
-};
-
 // ------------------ Compression -------------------
 
 // Store the snappy compression of "input[0,input_length-1]" in *output.
 // Returns false if snappy is not supported by this port.
-extern bool Snappy_Compress(const char* input, size_t input_length,
+bool Snappy_Compress(const char* input, size_t input_length,
                      std::string* output);
 
 // If input[0,input_length-1] looks like a valid snappy compressed
 // buffer, store the size of the uncompressed data in *result and
 // return true.  Else return false.
-extern bool Snappy_GetUncompressedLength(const char* input, size_t length,
+bool Snappy_GetUncompressedLength(const char* input, size_t length,
                                   size_t* result);
 
 // Attempt to snappy uncompress input[0,input_length-1] into *output.
@@ -119,7 +82,7 @@ extern bool Snappy_GetUncompressedLength(const char* input, size_t length,
 // REQUIRES: at least the first "n" bytes of output[] must be writable
 // where "n" is the result of a successful call to
 // Snappy_GetUncompressedLength.
-extern bool Snappy_Uncompress(const char* input_data, size_t input_length,
+bool Snappy_Uncompress(const char* input_data, size_t input_length,
                        char* output);
 
 // ------------------ Miscellaneous -------------------
@@ -127,11 +90,7 @@ extern bool Snappy_Uncompress(const char* input_data, size_t input_length,
 // If heap profiling is not supported, returns false.
 // Else repeatedly calls (*func)(arg, data, n) and then returns true.
 // The concatenation of all "data[0,n-1]" fragments is the heap profile.
-extern bool GetHeapProfile(void (*func)(void*, const char*, int), void* arg);
+bool GetHeapProfile(void (*func)(void*, const char*, int), void* arg);
-
-// Determine whether a working accelerated crc32 implementation exists
-// Returns true if AcceleratedCRC32C is safe to call
-bool HasAcceleratedCRC32C();
 
 // Extend the CRC to include the first n bytes of buf.
 //

port/port_posix.cc

@@ -1,67 +0,0 @@
-// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file. See the AUTHORS file for names of contributors.
-
-#include "port/port_posix.h"
-
-#include <cstdlib>
-#include <stdio.h>
-#include <string.h>
-
-#if (defined(__x86_64__) || defined(__i386__)) && defined(__GNUC__)
-#include <cpuid.h>
-#endif
-
-namespace leveldb {
-namespace port {
-
-static void PthreadCall(const char* label, int result) {
-  if (result != 0) {
-    fprintf(stderr, "pthread %s: %s\n", label, strerror(result));
-    abort();
-  }
-}
-
-Mutex::Mutex() { PthreadCall("init mutex", pthread_mutex_init(&mu_, NULL)); }
-
-Mutex::~Mutex() { PthreadCall("destroy mutex", pthread_mutex_destroy(&mu_)); }
-
-void Mutex::Lock() { PthreadCall("lock", pthread_mutex_lock(&mu_)); }
-
-void Mutex::Unlock() { PthreadCall("unlock", pthread_mutex_unlock(&mu_)); }
-
-CondVar::CondVar(Mutex* mu)
-    : mu_(mu) {
-    PthreadCall("init cv", pthread_cond_init(&cv_, NULL));
-}
-
-CondVar::~CondVar() { PthreadCall("destroy cv", pthread_cond_destroy(&cv_)); }
-
-void CondVar::Wait() {
-  PthreadCall("wait", pthread_cond_wait(&cv_, &mu_->mu_));
-}
-
-void CondVar::Signal() {
-  PthreadCall("signal", pthread_cond_signal(&cv_));
-}
-
-void CondVar::SignalAll() {
-  PthreadCall("broadcast", pthread_cond_broadcast(&cv_));
-}
-
-void InitOnce(OnceType* once, void (*initializer)()) {
-  PthreadCall("once", pthread_once(once, initializer));
-}
-
-bool HasAcceleratedCRC32C() {
-#if (defined(__x86_64__) || defined(__i386__)) && defined(__GNUC__)
-  unsigned int eax, ebx, ecx, edx;
-  __get_cpuid(1, &eax, &ebx, &ecx, &edx);
-  return (ecx & (1 << 20)) != 0;
-#else
-  return false;
-#endif
-}
-
-}  // namespace port
-}  // namespace leveldb

port/port_posix.h

@@ -1,161 +0,0 @@
-// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file. See the AUTHORS file for names of contributors.
-//
-// See port_example.h for documentation for the following types/functions.
-
-#ifndef STORAGE_LEVELDB_PORT_PORT_POSIX_H_
-#define STORAGE_LEVELDB_PORT_PORT_POSIX_H_
-
-#undef PLATFORM_IS_LITTLE_ENDIAN
-#if defined(OS_MACOSX)
-  #include <machine/endian.h>
-  #if defined(__DARWIN_LITTLE_ENDIAN) && defined(__DARWIN_BYTE_ORDER)
-    #define PLATFORM_IS_LITTLE_ENDIAN \
-        (__DARWIN_BYTE_ORDER == __DARWIN_LITTLE_ENDIAN)
-  #endif
-#elif defined(OS_SOLARIS)
-  #include <sys/isa_defs.h>
-  #ifdef _LITTLE_ENDIAN
-    #define PLATFORM_IS_LITTLE_ENDIAN true
-  #else
-    #define PLATFORM_IS_LITTLE_ENDIAN false
-  #endif
-#elif defined(OS_FREEBSD) || defined(OS_OPENBSD) ||\
-      defined(OS_NETBSD) || defined(OS_DRAGONFLYBSD)
-  #include <sys/types.h>
-  #include <sys/endian.h>
-  #define PLATFORM_IS_LITTLE_ENDIAN (_BYTE_ORDER == _LITTLE_ENDIAN)
-#elif defined(OS_HPUX)
-  #define PLATFORM_IS_LITTLE_ENDIAN false
-#elif defined(OS_ANDROID)
-  // Due to a bug in the NDK x86 <sys/endian.h> definition,
-  // _BYTE_ORDER must be used instead of __BYTE_ORDER on Android.
-  // See http://code.google.com/p/android/issues/detail?id=39824
-  #include <endian.h>
-  #define PLATFORM_IS_LITTLE_ENDIAN  (_BYTE_ORDER == _LITTLE_ENDIAN)
-#else
-  #include <endian.h>
-#endif
-
-#include <pthread.h>
-#ifdef SNAPPY
-#include <snappy.h>
-#endif
-#include <stdint.h>
-#include <string>
-#include "port/atomic_pointer.h"
-
-#ifndef PLATFORM_IS_LITTLE_ENDIAN
-#define PLATFORM_IS_LITTLE_ENDIAN (__BYTE_ORDER == __LITTLE_ENDIAN)
-#endif
-
-#if defined(OS_MACOSX) || defined(OS_SOLARIS) || defined(OS_FREEBSD) ||\
-    defined(OS_NETBSD) || defined(OS_OPENBSD) || defined(OS_DRAGONFLYBSD) ||\
-    defined(OS_ANDROID) || defined(OS_HPUX) || defined(CYGWIN)
-// Use fread/fwrite/fflush on platforms without _unlocked variants
-#define fread_unlocked fread
-#define fwrite_unlocked fwrite
-#define fflush_unlocked fflush
-#endif
-
-#if defined(OS_FREEBSD) ||\
-    defined(OS_OPENBSD) || defined(OS_DRAGONFLYBSD)
-// Use fsync() on platforms without fdatasync()
-#define fdatasync fsync
-#endif
-
-#if defined(OS_MACOSX)
-#define fdatasync(fd) fcntl(fd, F_FULLFSYNC, 0)
-#endif
-
-#if defined(OS_ANDROID) && __ANDROID_API__ < 9
-// fdatasync() was only introduced in API level 9 on Android. Use fsync()
-// when targetting older platforms.
-#define fdatasync fsync
-#endif
-
-namespace leveldb {
-namespace port {
-
-static const bool kLittleEndian = PLATFORM_IS_LITTLE_ENDIAN;
-#undef PLATFORM_IS_LITTLE_ENDIAN
-
-class CondVar;
-
-class Mutex {
- public:
-  Mutex();
-  ~Mutex();
-
-  void Lock();
-  void Unlock();
-  void AssertHeld() { }
-
- private:
-  friend class CondVar;
-  pthread_mutex_t mu_;
-
-  // No copying
-  Mutex(const Mutex&);
-  void operator=(const Mutex&);
-};
-
-class CondVar {
- public:
-  explicit CondVar(Mutex* mu);
-  ~CondVar();
-  void Wait();
-  void Signal();
-  void SignalAll();
- private:
-  pthread_cond_t cv_;
-  Mutex* mu_;
-};
-
-typedef pthread_once_t OnceType;
-#define LEVELDB_ONCE_INIT PTHREAD_ONCE_INIT
-extern void InitOnce(OnceType* once, void (*initializer)());
-
-inline bool Snappy_Compress(const char* input, size_t length,
-                            ::std::string* output) {
-#ifdef SNAPPY
-  output->resize(snappy::MaxCompressedLength(length));
-  size_t outlen;
-  snappy::RawCompress(input, length, &(*output)[0], &outlen);
-  output->resize(outlen);
-  return true;
-#endif
-
-  return false;
-}
-
-inline bool Snappy_GetUncompressedLength(const char* input, size_t length,
-                                         size_t* result) {
-#ifdef SNAPPY
-  return snappy::GetUncompressedLength(input, length, result);
-#else
-  return false;
-#endif
-}
-
-inline bool Snappy_Uncompress(const char* input, size_t length,
-                              char* output) {
-#ifdef SNAPPY
-  return snappy::RawUncompress(input, length, output);
-#else
-  return false;
-#endif
-}
-
-inline bool GetHeapProfile(void (*func)(void*, const char*, int), void* arg) {
-  return false;
-}
-
-bool HasAcceleratedCRC32C();
-uint32_t AcceleratedCRC32C(uint32_t crc, const char* buf, size_t size);
-
-} // namespace port
-} // namespace leveldb
-
-#endif  // STORAGE_LEVELDB_PORT_PORT_POSIX_H_

port/port_posix_sse.cc

@@ -1,110 +0,0 @@
-// Copyright 2016 The LevelDB Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file. See the AUTHORS file for names of contributors.
-//
-// A portable implementation of crc32c, optimized to handle
-// four bytes at a time.
-//
-// In a separate source file to allow this accelerated CRC32C function to be
-// compiled with the appropriate compiler flags to enable x86 SSE 4.2
-// instructions.
-
-#include <stdint.h>
-#include <string.h>
-#include "port/port.h"
-
-#if defined(LEVELDB_PLATFORM_POSIX_SSE)
-
-#if defined(_MSC_VER)
-#include <intrin.h>
-#elif defined(__GNUC__) && defined(__SSE4_2__)
-#include <nmmintrin.h>
-#endif
-
-#endif  // defined(LEVELDB_PLATFORM_POSIX_SSE)
-
-namespace leveldb {
-namespace port {
-
-#if defined(LEVELDB_PLATFORM_POSIX_SSE)
-
-// Used to fetch a naturally-aligned 32-bit word in little endian byte-order
-static inline uint32_t LE_LOAD32(const uint8_t *p) {
-  // SSE is x86 only, so ensured that |p| is always little-endian.
-  uint32_t word;
-  memcpy(&word, p, sizeof(word));
-  return word;
-}
-
-#if defined(_M_X64) || defined(__x86_64__)  // LE_LOAD64 is only used on x64.
-
-// Used to fetch a naturally-aligned 64-bit word in little endian byte-order
-static inline uint64_t LE_LOAD64(const uint8_t *p) {
-  uint64_t dword;
-  memcpy(&dword, p, sizeof(dword));
-  return dword;
-}
-
-#endif  // defined(_M_X64) || defined(__x86_64__)
-
-#endif  // defined(LEVELDB_PLATFORM_POSIX_SSE)
-
-// For further improvements see Intel publication at:
-// http://download.intel.com/design/intarch/papers/323405.pdf
-uint32_t AcceleratedCRC32C(uint32_t crc, const char* buf, size_t size) {
-#if !defined(LEVELDB_PLATFORM_POSIX_SSE)
-  return 0;
-#else
-
-  const uint8_t *p = reinterpret_cast<const uint8_t *>(buf);
-  const uint8_t *e = p + size;
-  uint32_t l = crc ^ 0xffffffffu;
-
-#define STEP1 do {                              \
-    l = _mm_crc32_u8(l, *p++);                  \
-} while (0)
-#define STEP4 do {                              \
-    l = _mm_crc32_u32(l, LE_LOAD32(p));         \
-    p += 4;                                     \
-} while (0)
-#define STEP8 do {                              \
-    l = _mm_crc32_u64(l, LE_LOAD64(p));         \
-    p += 8;                                     \
-} while (0)
-
-  if (size > 16) {
-    // Process unaligned bytes
-    for (unsigned int i = reinterpret_cast<uintptr_t>(p) % 8; i; --i) {
-      STEP1;
-    }
-
-    // _mm_crc32_u64 is only available on x64.
-#if defined(_M_X64) || defined(__x86_64__)
-    // Process 8 bytes at a time
-    while ((e-p) >= 8) {
-      STEP8;
-    }
-    // Process 4 bytes at a time
-    if ((e-p) >= 4) {
-      STEP4;
-    }
-#else  // !(defined(_M_X64) || defined(__x86_64__))
-    // Process 4 bytes at a time
-    while ((e-p) >= 4) {
-      STEP4;
-    }
-#endif  // defined(_M_X64) || defined(__x86_64__)
-  }
-  // Process the last few bytes
-  while (p != e) {
-    STEP1;
-  }
-#undef STEP8
-#undef STEP4
-#undef STEP1
-  return l ^ 0xffffffffu;
-#endif  // defined(LEVELDB_PLATFORM_POSIX_SSE)
-}
-
-}  // namespace port
-}  // namespace leveldb

port/port_stdcxx.h

@@ -0,0 +1,153 @@
+// Copyright (c) 2018 The LevelDB Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+
+#ifndef STORAGE_LEVELDB_PORT_PORT_STDCXX_H_
+#define STORAGE_LEVELDB_PORT_PORT_STDCXX_H_
+
+// port/port_config.h availability is automatically detected via __has_include
+// in newer compilers. If LEVELDB_HAS_PORT_CONFIG_H is defined, it overrides the
+// configuration detection.
+#if defined(LEVELDB_HAS_PORT_CONFIG_H)
+
+#if LEVELDB_HAS_PORT_CONFIG_H
+#include "port/port_config.h"
+#endif  // LEVELDB_HAS_PORT_CONFIG_H
+
+#elif defined(__has_include)
+
+#if __has_include("port/port_config.h")
+#include "port/port_config.h"
+#endif  // __has_include("port/port_config.h")
+
+#endif  // defined(LEVELDB_HAS_PORT_CONFIG_H)
+
+#if HAVE_CRC32C
+#include <crc32c/crc32c.h>
+#endif  // HAVE_CRC32C
+#if HAVE_SNAPPY
+#include <snappy.h>
+#endif  // HAVE_SNAPPY
+
+#include <cassert>
+#include <condition_variable>  // NOLINT
+#include <cstddef>
+#include <cstdint>
+#include <mutex>  // NOLINT
+#include <string>
+
+#include "port/thread_annotations.h"
+
+namespace leveldb {
+namespace port {
+
+static const bool kLittleEndian = !LEVELDB_IS_BIG_ENDIAN;
+
+class CondVar;
+
+// Thinly wraps std::mutex.
+class LOCKABLE Mutex {
+ public:
+  Mutex() = default;
+  ~Mutex() = default;
+
+  Mutex(const Mutex&) = delete;
+  Mutex& operator=(const Mutex&) = delete;
+
+  void Lock() EXCLUSIVE_LOCK_FUNCTION() { mu_.lock(); }
+  void Unlock() UNLOCK_FUNCTION() { mu_.unlock(); }
+  void AssertHeld() ASSERT_EXCLUSIVE_LOCK() {}
+
+ private:
+  friend class CondVar;
+  std::mutex mu_;
+};
+
+// Thinly wraps std::condition_variable.
+class CondVar {
+ public:
+  explicit CondVar(Mutex* mu) : mu_(mu) { assert(mu != nullptr); }
+  ~CondVar() = default;
+
+  CondVar(const CondVar&) = delete;
+  CondVar& operator=(const CondVar&) = delete;
+
+  void Wait() {
+    std::unique_lock<std::mutex> lock(mu_->mu_, std::adopt_lock);
+    cv_.wait(lock);
+    lock.release();
+  }
+  void Signal() { cv_.notify_one(); }
+  void SignalAll() { cv_.notify_all(); }
+
+ private:
+  std::condition_variable cv_;
+  Mutex* const mu_;
+};
+
+inline bool Snappy_Compress(const char* input, size_t length,
+                            std::string* output) {
+#if HAVE_SNAPPY
+  output->resize(snappy::MaxCompressedLength(length));
+  size_t outlen;
+  snappy::RawCompress(input, length, &(*output)[0], &outlen);
+  output->resize(outlen);
+  return true;
+#else
+  // Silence compiler warnings about unused arguments.
+  (void)input;
+  (void)length;
+  (void)output;
+#endif  // HAVE_SNAPPY
+
+  return false;
+}
+
+inline bool Snappy_GetUncompressedLength(const char* input, size_t length,
+                                         size_t* result) {
+#if HAVE_SNAPPY
+  return snappy::GetUncompressedLength(input, length, result);
+#else
+  // Silence compiler warnings about unused arguments.
+  (void)input;
+  (void)length;
+  (void)result;
+  return false;
+#endif  // HAVE_SNAPPY
+}
+
+inline bool Snappy_Uncompress(const char* input, size_t length, char* output) {
+#if HAVE_SNAPPY
+  return snappy::RawUncompress(input, length, output);
+#else
+  // Silence compiler warnings about unused arguments.
+  (void)input;
+  (void)length;
+  (void)output;
+  return false;
+#endif  // HAVE_SNAPPY
+}
+
+inline bool GetHeapProfile(void (*func)(void*, const char*, int), void* arg) {
+  // Silence compiler warnings about unused arguments.
+  (void)func;
+  (void)arg;
+  return false;
+}
+
+inline uint32_t AcceleratedCRC32C(uint32_t crc, const char* buf, size_t size) {
+#if HAVE_CRC32C
+  return ::crc32c::Extend(crc, reinterpret_cast<const uint8_t*>(buf), size);
+#else
+  // Silence compiler warnings about unused arguments.
+  (void)crc;
+  (void)buf;
+  (void)size;
+  return 0;
+#endif  // HAVE_CRC32C
+}
+
+}  // namespace port
+}  // namespace leveldb
+
+#endif  // STORAGE_LEVELDB_PORT_PORT_STDCXX_H_

port/port_win.cc

@@ -1,158 +0,0 @@
-// LevelDB Copyright (c) 2011 The LevelDB Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file. See the AUTHORS file for names of contributors.
-//
-// See port_example.h for documentation for the following types/functions.
-
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are met:
-// 
-//  * Redistributions of source code must retain the above copyright
-//    notice, this list of conditions and the following disclaimer.
-//  * Redistributions in binary form must reproduce the above copyright
-//    notice, this list of conditions and the following disclaimer in the
-//    documentation and/or other materials provided with the distribution.
-//  * Neither the name of the University of California, Berkeley nor the
-//    names of its contributors may be used to endorse or promote products
-//    derived from this software without specific prior written permission.
-// 
-// THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
-// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-// DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
-// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
-// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-//
-
-#include "port/port_win.h"
-
-#include <windows.h>
-#include <cassert>
-#include <intrin.h>
-
-namespace leveldb {
-namespace port {
-
-Mutex::Mutex() :
-    cs_(NULL) {
-  assert(!cs_);
-  cs_ = static_cast<void *>(new CRITICAL_SECTION());
-  ::InitializeCriticalSection(static_cast<CRITICAL_SECTION *>(cs_));
-  assert(cs_);
-}
-
-Mutex::~Mutex() {
-  assert(cs_);
-  ::DeleteCriticalSection(static_cast<CRITICAL_SECTION *>(cs_));
-  delete static_cast<CRITICAL_SECTION *>(cs_);
-  cs_ = NULL;
-  assert(!cs_);
-}
-
-void Mutex::Lock() {
-  assert(cs_);
-  ::EnterCriticalSection(static_cast<CRITICAL_SECTION *>(cs_));
-}
-
-void Mutex::Unlock() {
-  assert(cs_);
-  ::LeaveCriticalSection(static_cast<CRITICAL_SECTION *>(cs_));
-}
-
-void Mutex::AssertHeld() {
-  assert(cs_);
-  assert(1);
-}
-
-CondVar::CondVar(Mutex* mu) :
-    waiting_(0), 
-    mu_(mu), 
-    sem1_(::CreateSemaphore(NULL, 0, 10000, NULL)), 
-    sem2_(::CreateSemaphore(NULL, 0, 10000, NULL)) {
-  assert(mu_);
-}
-
-CondVar::~CondVar() {
-  ::CloseHandle(sem1_);
-  ::CloseHandle(sem2_);
-}
-
-void CondVar::Wait() {
-  mu_->AssertHeld();
-
-  wait_mtx_.Lock();
-  ++waiting_;
-  wait_mtx_.Unlock();
-
-  mu_->Unlock();
-
-  // initiate handshake
-  ::WaitForSingleObject(sem1_, INFINITE);
-  ::ReleaseSemaphore(sem2_, 1, NULL);
-  mu_->Lock();
-}
-
-void CondVar::Signal() {
-  wait_mtx_.Lock();
-  if (waiting_ > 0) {
-    --waiting_;
-
-    // finalize handshake
-    ::ReleaseSemaphore(sem1_, 1, NULL);
-    ::WaitForSingleObject(sem2_, INFINITE);
-  }
-  wait_mtx_.Unlock();
-}
-
-void CondVar::SignalAll() {
-  wait_mtx_.Lock();
-  ::ReleaseSemaphore(sem1_, waiting_, NULL);
-  while(waiting_ > 0) {
-    --waiting_;
-    ::WaitForSingleObject(sem2_, INFINITE);
-  }
-  wait_mtx_.Unlock();
-}
-
-AtomicPointer::AtomicPointer(void* v) {
-  Release_Store(v);
-}
-
-void InitOnce(OnceType* once, void (*initializer)()) {
-  once->InitOnce(initializer);
-}
-
-void* AtomicPointer::Acquire_Load() const {
-  void * p = NULL;
-  InterlockedExchangePointer(&p, rep_);
-  return p;
-}
-
-void AtomicPointer::Release_Store(void* v) {
-  InterlockedExchangePointer(&rep_, v);
-}
-
-void* AtomicPointer::NoBarrier_Load() const {
-  return rep_;
-}
-
-void AtomicPointer::NoBarrier_Store(void* v) {
-  rep_ = v;
-}
-
-bool HasAcceleratedCRC32C() {
-#if defined(__x86_64__) || defined(__i386__)
-  int cpu_info[4];
-  __cpuid(cpu_info, 1);
-  return (cpu_info[2] & (1 << 20)) != 0;
-#else
-  return false;
-#endif
-}
-
-}
-}

port/port_win.h

@@ -1,184 +0,0 @@
-// LevelDB Copyright (c) 2011 The LevelDB Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file. See the AUTHORS file for names of contributors.
-//
-// See port_example.h for documentation for the following types/functions.
-
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are met:
-// 
-//  * Redistributions of source code must retain the above copyright
-//    notice, this list of conditions and the following disclaimer.
-//  * Redistributions in binary form must reproduce the above copyright
-//    notice, this list of conditions and the following disclaimer in the
-//    documentation and/or other materials provided with the distribution.
-//  * Neither the name of the University of California, Berkeley nor the
-//    names of its contributors may be used to endorse or promote products
-//    derived from this software without specific prior written permission.
-// 
-// THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
-// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-// DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
-// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
-// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-//
-
-#ifndef STORAGE_LEVELDB_PORT_PORT_WIN_H_
-#define STORAGE_LEVELDB_PORT_PORT_WIN_H_
-
-#ifdef _MSC_VER
-#if !(_MSC_VER >= 1900)
-#define snprintf _snprintf
-#endif
-#define close _close
-#define fread_unlocked _fread_nolock
-#ifdef _WIN64
-#define ssize_t int64_t
-#else
-#define ssize_t int32_t
-#endif
-#endif
-
-#include <string>
-#include <stdint.h>
-#ifdef SNAPPY
-#include <snappy.h>
-#endif
-
-namespace leveldb {
-namespace port {
-
-// Windows is little endian (for now :p)
-static const bool kLittleEndian = true;
-
-class CondVar;
-
-class Mutex {
- public:
-  Mutex();
-  ~Mutex();
-
-  void Lock();
-  void Unlock();
-  void AssertHeld();
-
- private:
-  friend class CondVar;
-  // critical sections are more efficient than mutexes
-  // but they are not recursive and can only be used to synchronize threads within the same process
-  // we use opaque void * to avoid including windows.h in port_win.h
-  void * cs_;
-
-  // No copying
-  Mutex(const Mutex&);
-  void operator=(const Mutex&);
-};
-
-// the Win32 API offers a dependable condition variable mechanism, but only starting with
-// Windows 2008 and Vista
-// no matter what we will implement our own condition variable with a semaphore
-// implementation as described in a paper written by Andrew D. Birrell in 2003
-class CondVar {
- public:
-  explicit CondVar(Mutex* mu);
-  ~CondVar();
-  void Wait();
-  void Signal();
-  void SignalAll();
- private:
-  Mutex* mu_;
-  
-  Mutex wait_mtx_;
-  long waiting_;
-  
-  void * sem1_;
-  void * sem2_;
-  
-  
-};
-
-class OnceType {
-public:
-//    OnceType() : init_(false) {}
-    OnceType(const OnceType &once) : init_(once.init_) {}
-    OnceType(bool f) : init_(f) {}
-    void InitOnce(void (*initializer)()) {
-        mutex_.Lock();
-        if (!init_) {
-            init_ = true;
-            initializer();
-        }
-        mutex_.Unlock();
-    }
-
-private:
-    bool init_;
-    Mutex mutex_;
-};
-
-#define LEVELDB_ONCE_INIT false
-extern void InitOnce(port::OnceType*, void (*initializer)());
-
-// Storage for a lock-free pointer
-class AtomicPointer {
- private:
-  void * rep_;
- public:
-  AtomicPointer() : rep_(NULL) { }
-  explicit AtomicPointer(void* v); 
-  void* Acquire_Load() const;
-
-  void Release_Store(void* v);
-
-  void* NoBarrier_Load() const;
-
-  void NoBarrier_Store(void* v);
-};
-
-inline bool Snappy_Compress(const char* input, size_t length,
-                            ::std::string* output) {
-#ifdef SNAPPY
-  output->resize(snappy::MaxCompressedLength(length));
-  size_t outlen;
-  snappy::RawCompress(input, length, &(*output)[0], &outlen);
-  output->resize(outlen);
-  return true;
-#endif
-
-  return false;
-}
-
-inline bool Snappy_GetUncompressedLength(const char* input, size_t length,
-                                         size_t* result) {
-#ifdef SNAPPY
-  return snappy::GetUncompressedLength(input, length, result);
-#else
-  return false;
-#endif
-}
-
-inline bool Snappy_Uncompress(const char* input, size_t length,
-                              char* output) {
-#ifdef SNAPPY
-  return snappy::RawUncompress(input, length, output);
-#else
-  return false;
-#endif
-}
-
-inline bool GetHeapProfile(void (*func)(void*, const char*, int), void* arg) {
-  return false;
-}
-
-bool HasAcceleratedCRC32C();
-uint32_t AcceleratedCRC32C(uint32_t crc, const char* buf, size_t size);
-
-}
-}
-
-#endif  // STORAGE_LEVELDB_PORT_PORT_WIN_H_

port/thread_annotations.h

@@ -5,56 +5,104 @@
 #ifndef STORAGE_LEVELDB_PORT_THREAD_ANNOTATIONS_H_
 #define STORAGE_LEVELDB_PORT_THREAD_ANNOTATIONS_H_
 
-// Some environments provide custom macros to aid in static thread-safety
+// Use Clang's thread safety analysis annotations when available. In other
-// analysis.  Provide empty definitions of such macros unless they are already
+// environments, the macros receive empty definitions.
-// defined.
+// Usage documentation: https://clang.llvm.org/docs/ThreadSafetyAnalysis.html
+
+#if !defined(THREAD_ANNOTATION_ATTRIBUTE__)
+
+#if defined(__clang__)
+
+#define THREAD_ANNOTATION_ATTRIBUTE__(x) __attribute__((x))
+#else
+#define THREAD_ANNOTATION_ATTRIBUTE__(x)  // no-op
+#endif
+
+#endif  // !defined(THREAD_ANNOTATION_ATTRIBUTE__)
+
+#ifndef GUARDED_BY
+#define GUARDED_BY(x) THREAD_ANNOTATION_ATTRIBUTE__(guarded_by(x))
+#endif
+
+#ifndef PT_GUARDED_BY
+#define PT_GUARDED_BY(x) THREAD_ANNOTATION_ATTRIBUTE__(pt_guarded_by(x))
+#endif
+
+#ifndef ACQUIRED_AFTER
+#define ACQUIRED_AFTER(...) \
+  THREAD_ANNOTATION_ATTRIBUTE__(acquired_after(__VA_ARGS__))
+#endif
+
+#ifndef ACQUIRED_BEFORE
+#define ACQUIRED_BEFORE(...) \
+  THREAD_ANNOTATION_ATTRIBUTE__(acquired_before(__VA_ARGS__))
+#endif
 
 #ifndef EXCLUSIVE_LOCKS_REQUIRED
-#define EXCLUSIVE_LOCKS_REQUIRED(...)
+#define EXCLUSIVE_LOCKS_REQUIRED(...) \
+  THREAD_ANNOTATION_ATTRIBUTE__(exclusive_locks_required(__VA_ARGS__))
 #endif
 
 #ifndef SHARED_LOCKS_REQUIRED
-#define SHARED_LOCKS_REQUIRED(...)
+#define SHARED_LOCKS_REQUIRED(...) \
+  THREAD_ANNOTATION_ATTRIBUTE__(shared_locks_required(__VA_ARGS__))
 #endif
 
 #ifndef LOCKS_EXCLUDED
-#define LOCKS_EXCLUDED(...)
+#define LOCKS_EXCLUDED(...) \
+  THREAD_ANNOTATION_ATTRIBUTE__(locks_excluded(__VA_ARGS__))
 #endif
 
 #ifndef LOCK_RETURNED
-#define LOCK_RETURNED(x)
+#define LOCK_RETURNED(x) THREAD_ANNOTATION_ATTRIBUTE__(lock_returned(x))
 #endif
 
 #ifndef LOCKABLE
-#define LOCKABLE
+#define LOCKABLE THREAD_ANNOTATION_ATTRIBUTE__(lockable)
 #endif
 
 #ifndef SCOPED_LOCKABLE
-#define SCOPED_LOCKABLE
+#define SCOPED_LOCKABLE THREAD_ANNOTATION_ATTRIBUTE__(scoped_lockable)
 #endif
 
 #ifndef EXCLUSIVE_LOCK_FUNCTION
-#define EXCLUSIVE_LOCK_FUNCTION(...)
+#define EXCLUSIVE_LOCK_FUNCTION(...) \
+  THREAD_ANNOTATION_ATTRIBUTE__(exclusive_lock_function(__VA_ARGS__))
 #endif
 
 #ifndef SHARED_LOCK_FUNCTION
-#define SHARED_LOCK_FUNCTION(...)
+#define SHARED_LOCK_FUNCTION(...) \
+  THREAD_ANNOTATION_ATTRIBUTE__(shared_lock_function(__VA_ARGS__))
 #endif
 
 #ifndef EXCLUSIVE_TRYLOCK_FUNCTION
-#define EXCLUSIVE_TRYLOCK_FUNCTION(...)
+#define EXCLUSIVE_TRYLOCK_FUNCTION(...) \
+  THREAD_ANNOTATION_ATTRIBUTE__(exclusive_trylock_function(__VA_ARGS__))
 #endif
 
 #ifndef SHARED_TRYLOCK_FUNCTION
-#define SHARED_TRYLOCK_FUNCTION(...)
+#define SHARED_TRYLOCK_FUNCTION(...) \
+  THREAD_ANNOTATION_ATTRIBUTE__(shared_trylock_function(__VA_ARGS__))
 #endif
 
 #ifndef UNLOCK_FUNCTION
-#define UNLOCK_FUNCTION(...)
+#define UNLOCK_FUNCTION(...) \
+  THREAD_ANNOTATION_ATTRIBUTE__(unlock_function(__VA_ARGS__))
 #endif
 
 #ifndef NO_THREAD_SAFETY_ANALYSIS
-#define NO_THREAD_SAFETY_ANALYSIS
+#define NO_THREAD_SAFETY_ANALYSIS \
+  THREAD_ANNOTATION_ATTRIBUTE__(no_thread_safety_analysis)
+#endif
+
+#ifndef ASSERT_EXCLUSIVE_LOCK
+#define ASSERT_EXCLUSIVE_LOCK(...) \
+  THREAD_ANNOTATION_ATTRIBUTE__(assert_exclusive_lock(__VA_ARGS__))
+#endif
+
+#ifndef ASSERT_SHARED_LOCK
+#define ASSERT_SHARED_LOCK(...) \
+  THREAD_ANNOTATION_ATTRIBUTE__(assert_shared_lock(__VA_ARGS__))
 #endif
 
 #endif  // STORAGE_LEVELDB_PORT_THREAD_ANNOTATIONS_H_

port/win/stdint.h

@@ -1,24 +0,0 @@
-// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file. See the AUTHORS file for names of contributors.
-
-// MSVC didn't ship with this file until the 2010 version.
-
-#ifndef STORAGE_LEVELDB_PORT_WIN_STDINT_H_
-#define STORAGE_LEVELDB_PORT_WIN_STDINT_H_
-
-#if !defined(_MSC_VER)
-#error This file should only be included when compiling with MSVC.
-#endif
-
-// Define C99 equivalent types.
-typedef signed char           int8_t;
-typedef signed short          int16_t;
-typedef signed int            int32_t;
-typedef signed long long      int64_t;
-typedef unsigned char         uint8_t;
-typedef unsigned short        uint16_t;
-typedef unsigned int          uint32_t;
-typedef unsigned long long    uint64_t;
-
-#endif  // STORAGE_LEVELDB_PORT_WIN_STDINT_H_

table/block.cc

@@ -6,8 +6,10 @@
 
 #include "table/block.h"
 
-#include <vector>
 #include <algorithm>
+#include <cstdint>
+#include <vector>
+
 #include "leveldb/comparator.h"
 #include "table/format.h"
 #include "util/coding.h"
@@ -27,7 +29,7 @@ Block::Block(const BlockContents& contents)
   if (size_ < sizeof(uint32_t)) {
     size_ = 0;  // Error marker
   } else {
-    size_t max_restarts_allowed = (size_-sizeof(uint32_t)) / sizeof(uint32_t);
+    size_t max_restarts_allowed = (size_ - sizeof(uint32_t)) / sizeof(uint32_t);
     if (NumRestarts() > max_restarts_allowed) {
       // The size is too small for NumRestarts()
       size_ = 0;
@@ -48,27 +50,26 @@ Block::~Block() {
 // and the length of the value in "*shared", "*non_shared", and
 // "*value_length", respectively.  Will not dereference past "limit".
 //
-// If any errors are detected, returns NULL.  Otherwise, returns a
+// If any errors are detected, returns nullptr.  Otherwise, returns a
 // pointer to the key delta (just past the three decoded values).
 static inline const char* DecodeEntry(const char* p, const char* limit,
-                                      uint32_t* shared,
+                                      uint32_t* shared, uint32_t* non_shared,
-                                      uint32_t* non_shared,
                                       uint32_t* value_length) {
-  if (limit - p < 3) return NULL;
+  if (limit - p < 3) return nullptr;
-  *shared = reinterpret_cast<const unsigned char*>(p)[0];
+  *shared = reinterpret_cast<const uint8_t*>(p)[0];
-  *non_shared = reinterpret_cast<const unsigned char*>(p)[1];
+  *non_shared = reinterpret_cast<const uint8_t*>(p)[1];
-  *value_length = reinterpret_cast<const unsigned char*>(p)[2];
+  *value_length = reinterpret_cast<const uint8_t*>(p)[2];
   if ((*shared | *non_shared | *value_length) < 128) {
     // Fast path: all three values are encoded in one byte each
     p += 3;
   } else {
-    if ((p = GetVarint32Ptr(p, limit, shared)) == NULL) return NULL;
+    if ((p = GetVarint32Ptr(p, limit, shared)) == nullptr) return nullptr;
-    if ((p = GetVarint32Ptr(p, limit, non_shared)) == NULL) return NULL;
+    if ((p = GetVarint32Ptr(p, limit, non_shared)) == nullptr) return nullptr;
-    if ((p = GetVarint32Ptr(p, limit, value_length)) == NULL) return NULL;
+    if ((p = GetVarint32Ptr(p, limit, value_length)) == nullptr) return nullptr;
   }
 
   if (static_cast<uint32_t>(limit - p) < (*non_shared + *value_length)) {
-    return NULL;
+    return nullptr;
   }
   return p;
 }
@@ -112,9 +113,7 @@ class Block::Iter : public Iterator {
   }
 
  public:
-  Iter(const Comparator* comparator,
+  Iter(const Comparator* comparator, const char* data, uint32_t restarts,
-       const char* data,
-       uint32_t restarts,
        uint32_t num_restarts)
       : comparator_(comparator),
         data_(data),
@@ -125,23 +124,23 @@ class Block::Iter : public Iterator {
     assert(num_restarts_ > 0);
   }
 
-  virtual bool Valid() const { return current_ < restarts_; }
+  bool Valid() const override { return current_ < restarts_; }
-  virtual Status status() const { return status_; }
+  Status status() const override { return status_; }
-  virtual Slice key() const {
+  Slice key() const override {
     assert(Valid());
     return key_;
   }
-  virtual Slice value() const {
+  Slice value() const override {
     assert(Valid());
     return value_;
   }
 
-  virtual void Next() {
+  void Next() override {
     assert(Valid());
     ParseNextKey();
   }
 
-  virtual void Prev() {
+  void Prev() override {
     assert(Valid());
 
     // Scan backwards to a restart point before current_
@@ -162,7 +161,7 @@ class Block::Iter : public Iterator {
     } while (ParseNextKey() && NextEntryOffset() < original);
   }
 
-  virtual void Seek(const Slice& target) {
+  void Seek(const Slice& target) override {
     // Binary search in restart array to find the last restart point
     // with a key < target
     uint32_t left = 0;
@@ -171,10 +170,10 @@ class Block::Iter : public Iterator {
       uint32_t mid = (left + right + 1) / 2;
       uint32_t region_offset = GetRestartPoint(mid);
       uint32_t shared, non_shared, value_length;
-      const char* key_ptr = DecodeEntry(data_ + region_offset,
+      const char* key_ptr =
-                                        data_ + restarts_,
+          DecodeEntry(data_ + region_offset, data_ + restarts_, &shared,
-                                        &shared, &non_shared, &value_length);
+                      &non_shared, &value_length);
-      if (key_ptr == NULL || (shared != 0)) {
+      if (key_ptr == nullptr || (shared != 0)) {
         CorruptionError();
         return;
       }
@@ -202,12 +201,12 @@ class Block::Iter : public Iterator {
     }
   }
 
-  virtual void SeekToFirst() {
+  void SeekToFirst() override {
     SeekToRestartPoint(0);
     ParseNextKey();
   }
 
-  virtual void SeekToLast() {
+  void SeekToLast() override {
     SeekToRestartPoint(num_restarts_ - 1);
     while (ParseNextKey() && NextEntryOffset() < restarts_) {
       // Keep skipping
@@ -237,7 +236,7 @@ class Block::Iter : public Iterator {
     // Decode next entry
     uint32_t shared, non_shared, value_length;
     p = DecodeEntry(p, limit, &shared, &non_shared, &value_length);
-    if (p == NULL || key_.size() < shared) {
+    if (p == nullptr || key_.size() < shared) {
       CorruptionError();
       return false;
     } else {
@@ -253,7 +252,7 @@ class Block::Iter : public Iterator {
   }
 };
 
-Iterator* Block::NewIterator(const Comparator* cmp) {
+Iterator* Block::NewIterator(const Comparator* comparator) {
   if (size_ < sizeof(uint32_t)) {
     return NewErrorIterator(Status::Corruption("bad block contents"));
   }
@@ -261,7 +260,7 @@ Iterator* Block::NewIterator(const Comparator* cmp) {
   if (num_restarts == 0) {
     return NewEmptyIterator();
   } else {
-    return new Iter(cmp, data_, restart_offset_, num_restarts);
+    return new Iter(comparator, data_, restart_offset_, num_restarts);
   }
 }
 

table/block.h

@@ -7,6 +7,7 @@
 
 #include <stddef.h>
 #include <stdint.h>
+
 #include "leveldb/iterator.h"
 
 namespace leveldb {
@@ -19,24 +20,23 @@ class Block {
   // Initialize the block with the specified contents.
   explicit Block(const BlockContents& contents);
 
+  Block(const Block&) = delete;
+  Block& operator=(const Block&) = delete;
+
   ~Block();
 
   size_t size() const { return size_; }
   Iterator* NewIterator(const Comparator* comparator);
 
  private:
+  class Iter;
+
   uint32_t NumRestarts() const;
 
   const char* data_;
   size_t size_;
   uint32_t restart_offset_;  // Offset in data_ of restart array
   bool owned_;               // Block owns data_[]
-
-  // No copying allowed
-  Block(const Block&);
-  void operator=(const Block&);
-
-  class Iter;
 };
 
 }  // namespace leveldb

table/block_builder.cc

@@ -28,19 +28,18 @@
 
 #include "table/block_builder.h"
 
-#include <algorithm>
 #include <assert.h>
+
+#include <algorithm>
+
 #include "leveldb/comparator.h"
-#include "leveldb/table_builder.h"
+#include "leveldb/options.h"
 #include "util/coding.h"
 
 namespace leveldb {
 
 BlockBuilder::BlockBuilder(const Options* options)
-    : options_(options),
+    : options_(options), restarts_(), counter_(0), finished_(false) {
-      restarts_(),
-      counter_(0),
-      finished_(false) {
   assert(options->block_restart_interval >= 1);
   restarts_.push_back(0);  // First restart point is at offset 0
 }

table/block_builder.h

@@ -5,9 +5,10 @@
 #ifndef STORAGE_LEVELDB_TABLE_BLOCK_BUILDER_H_
 #define STORAGE_LEVELDB_TABLE_BLOCK_BUILDER_H_
 
+#include <stdint.h>
+
 #include <vector>
 
-#include <stdint.h>
 #include "leveldb/slice.h"
 
 namespace leveldb {
@@ -18,6 +19,9 @@ class BlockBuilder {
  public:
   explicit BlockBuilder(const Options* options);
 
+  BlockBuilder(const BlockBuilder&) = delete;
+  BlockBuilder& operator=(const BlockBuilder&) = delete;
+
   // Reset the contents as if the BlockBuilder was just constructed.
   void Reset();
 
@@ -35,9 +39,7 @@ class BlockBuilder {
   size_t CurrentSizeEstimate() const;
 
   // Return true iff no entries have been added since the last Reset()
-  bool empty() const {
+  bool empty() const { return buffer_.empty(); }
-    return buffer_.empty();
-  }
 
  private:
   const Options* options_;
@@ -46,10 +48,6 @@ class BlockBuilder {
   int counter_;                     // Number of entries emitted since restart
   bool finished_;                   // Has Finish() been called?
   std::string last_key_;
-
-  // No copying allowed
-  BlockBuilder(const BlockBuilder&);
-  void operator=(const BlockBuilder&);
 };
 
 }  // namespace leveldb

table/filter_block.cc

@@ -16,8 +16,7 @@ static const size_t kFilterBaseLg = 11;
 static const size_t kFilterBase = 1 << kFilterBaseLg;
 
 FilterBlockBuilder::FilterBlockBuilder(const FilterPolicy* policy)
-    : policy_(policy) {
+    : policy_(policy) {}
-}
 
 void FilterBlockBuilder::StartBlock(uint64_t block_offset) {
   uint64_t filter_index = (block_offset / kFilterBase);
@@ -62,7 +61,7 @@ void FilterBlockBuilder::GenerateFilter() {
   tmp_keys_.resize(num_keys);
   for (size_t i = 0; i < num_keys; i++) {
     const char* base = keys_.data() + start_[i];
-    size_t length = start_[i+1] - start_[i];
+    size_t length = start_[i + 1] - start_[i];
     tmp_keys_[i] = Slice(base, length);
   }
 
@@ -77,14 +76,10 @@ void FilterBlockBuilder::GenerateFilter() {
 
 FilterBlockReader::FilterBlockReader(const FilterPolicy* policy,
                                      const Slice& contents)
-    : policy_(policy),
+    : policy_(policy), data_(nullptr), offset_(nullptr), num_(0), base_lg_(0) {
-      data_(NULL),
-      offset_(NULL),
-      num_(0),
-      base_lg_(0) {
   size_t n = contents.size();
   if (n < 5) return;  // 1 byte for base_lg_ and 4 for start of offset array
-  base_lg_ = contents[n-1];
+  base_lg_ = contents[n - 1];
   uint32_t last_word = DecodeFixed32(contents.data() + n - 5);
   if (last_word > n - 5) return;
   data_ = contents.data();
@@ -95,8 +90,8 @@ FilterBlockReader::FilterBlockReader(const FilterPolicy* policy,
 bool FilterBlockReader::KeyMayMatch(uint64_t block_offset, const Slice& key) {
   uint64_t index = block_offset >> base_lg_;
   if (index < num_) {
-    uint32_t start = DecodeFixed32(offset_ + index*4);
+    uint32_t start = DecodeFixed32(offset_ + index * 4);
-    uint32_t limit = DecodeFixed32(offset_ + index*4 + 4);
+    uint32_t limit = DecodeFixed32(offset_ + index * 4 + 4);
     if (start <= limit && limit <= static_cast<size_t>(offset_ - data_)) {
       Slice filter = Slice(data_ + start, limit - start);
       return policy_->KeyMayMatch(key, filter);
@@ -108,4 +103,4 @@ bool FilterBlockReader::KeyMayMatch(uint64_t block_offset, const Slice& key) {
   return true;  // Errors are treated as potential matches
 }
 
-}
+}  // namespace leveldb

table/filter_block.h

@@ -11,8 +11,10 @@
 
 #include <stddef.h>
 #include <stdint.h>
+
 #include <string>
 #include <vector>
+
 #include "leveldb/slice.h"
 #include "util/hash.h"
 
@@ -30,6 +32,9 @@ class FilterBlockBuilder {
  public:
   explicit FilterBlockBuilder(const FilterPolicy*);
 
+  FilterBlockBuilder(const FilterBlockBuilder&) = delete;
+  FilterBlockBuilder& operator=(const FilterBlockBuilder&) = delete;
+
   void StartBlock(uint64_t block_offset);
   void AddKey(const Slice& key);
   Slice Finish();
@@ -43,10 +48,6 @@ class FilterBlockBuilder {
   std::string result_;           // Filter data computed so far
   std::vector<Slice> tmp_keys_;  // policy_->CreateFilter() argument
   std::vector<uint32_t> filter_offsets_;
-
-  // No copying allowed
-  FilterBlockBuilder(const FilterBlockBuilder&);
-  void operator=(const FilterBlockBuilder&);
 };
 
 class FilterBlockReader {
@@ -63,6 +64,6 @@ class FilterBlockReader {
   size_t base_lg_;      // Encoding parameter (see kFilterBaseLg in .cc file)
 };
 
-}
+}  // namespace leveldb
 
 #endif  // STORAGE_LEVELDB_TABLE_FILTER_BLOCK_H_