mirrors/bitcoin
1
0
Fork 0
mirror of https://github.com/bitcoin/bitcoin.git synced 2024-11-19 01:42:58 +01:00
Code Issues Projects Releases Wiki Activity

build: Minimize I/O operations in GenerateHeaderFromRaw.cmake

Browse Source 
Replaced multiple file writes with a single string template write.
The raw content is first grouped into 8 byte chunks, followed by another regex replace which wraps them in `std::byte`.

Tested the output with `diff -w` and they're the same - only whitespace differences because slightly different source formatting.

Tested the performance with:
> time cmake -DRAW_SOURCE_PATH=src/bench/data/block413567.raw -DHEADER_PATH=build/after/block413567.raw.h -DRAW_NAMESPACE=benchmark::data -P cmake/script/GenerateHeaderFromRaw.cmake

Before:
> 15.41s user 23.06s system 97% cpu 39.593 total
After:
> 0.77s user 0.06s system 97% cpu 0.849 total
This commit is contained in:
Lőrinc 2024-09-12 19:58:14 +02:00
parent e46bebb444
commit aa003d1568
1 changed files with 15 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
cmake/script/GenerateHeaderFromRaw.cmake
View File

@ -2,26 +2,22 @@
# Distributed under the MIT software license, see the accompanying
# file COPYING or https://opensource.org/license/mit/.
cmake_path(GET RAW_SOURCE_PATH STEM raw_source_basename)
file(READ ${RAW_SOURCE_PATH} hex_content HEX)
string(REGEX MATCHALL "([A-Za-z0-9][A-Za-z0-9])" bytes "${hex_content}")
string(REGEX REPLACE "................" "\\0\n" formatted_bytes "${hex_content}")
string(REGEX REPLACE "[^\n][^\n]" "std::byte{0x\\0}, " formatted_bytes "${formatted_bytes}")
file(WRITE ${HEADER_PATH} "#include <cstddef>\n")
file(APPEND ${HEADER_PATH} "#include <span>\n")
file(APPEND ${HEADER_PATH} "namespace ${RAW_NAMESPACE} {\n")
get_filename_component(raw_source_basename ${RAW_SOURCE_PATH} NAME_WE)
file(APPEND ${HEADER_PATH} "inline constexpr std::byte detail_${raw_source_basename}_raw[]{\n")
set(header_content
"#include <cstddef>
#include <span>
set(i 0)
foreach(byte ${bytes})
math(EXPR i "${i} + 1")
math(EXPR remainder "${i} % 8")
if(remainder EQUAL 0)
file(APPEND ${HEADER_PATH} "std::byte{0x${byte}},\n")
else()
file(APPEND ${HEADER_PATH} "std::byte{0x${byte}}, ")
endif()
endforeach()
namespace ${RAW_NAMESPACE} {
inline constexpr std::byte detail_${raw_source_basename}_raw[] {
${formatted_bytes}
};
file(APPEND ${HEADER_PATH} "\n};\n")
file(APPEND ${HEADER_PATH} "inline constexpr std::span ${raw_source_basename}{detail_${raw_source_basename}_raw};\n")
file(APPEND ${HEADER_PATH} "}")
inline constexpr std::span ${raw_source_basename}{detail_${raw_source_basename}_raw};
}
")
file(WRITE ${HEADER_PATH} "${header_content}")