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build: Minimize I/O operations in GenerateHeaderFromJson.cmake

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Tested the performance with:
>  time cmake -DJSON_SOURCE_PATH=src/secp256k1/src/wycheproof/ecdsa_secp256k1_sha256_bitcoin_test.json -DHEADER_PATH=build/after/ecdsa_secp256k1_sha256_bitcoin_test.json -P cmake/script/GenerateHeaderFromJson.cmake

Before:
> 3.57s user 6.01s system 94% cpu 10.136 total

After:
> 0.17s user 0.01s system 98% cpu 0.187 total
This commit is contained in:
Lőrinc 2024-09-12 20:51:48 +02:00
parent aa003d1568
commit 2a581144f2
1 changed files with 14 additions and 18 deletions
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32
cmake/script/GenerateHeaderFromJson.cmake
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@ -2,25 +2,21 @@
# Distributed under the MIT software license, see the accompanying
# file COPYING or https://opensource.org/license/mit/.
cmake_path(GET JSON_SOURCE_PATH STEM json_source_basename)
file(READ ${JSON_SOURCE_PATH} hex_content HEX)
string(REGEX MATCHALL "([A-Za-z0-9][A-Za-z0-9])" bytes "${hex_content}")
string(REGEX REPLACE "................" "\\0\n" formatted_bytes "${hex_content}")
string(REGEX REPLACE "[^\n][^\n]" "0x\\0, " formatted_bytes "${formatted_bytes}")
file(WRITE ${HEADER_PATH} "#include <string_view>\n")
file(APPEND ${HEADER_PATH} "namespace json_tests{\n")
get_filename_component(json_source_basename ${JSON_SOURCE_PATH} NAME_WE)
file(APPEND ${HEADER_PATH} "inline constexpr char detail_${json_source_basename}_bytes[]{\n")
set(header_content
"#include <string_view>
set(i 0)
foreach(byte ${bytes})
math(EXPR i "${i} + 1")
math(EXPR remainder "${i} % 8")
if(remainder EQUAL 0)
file(APPEND ${HEADER_PATH} "0x${byte},\n")
else()
file(APPEND ${HEADER_PATH} "0x${byte}, ")
endif()
endforeach()
namespace json_tests {
inline constexpr char detail_${json_source_basename}_bytes[] {
${formatted_bytes}
};
file(APPEND ${HEADER_PATH} "\n};\n")
file(APPEND ${HEADER_PATH} "inline constexpr std::string_view ${json_source_basename}{std::begin(detail_${json_source_basename}_bytes), std::end(detail_${json_source_basename}_bytes)};")
file(APPEND ${HEADER_PATH} "\n}")
inline constexpr std::string_view ${json_source_basename}{std::begin(detail_${json_source_basename}_bytes), std::end(detail_${json_source_basename}_bytes)};
}
")
file(WRITE ${HEADER_PATH} "${header_content}")