bitcoin/cmake/script/GenerateHeaderFromJson.cmake
Lőrinc 2a581144f2 build: Minimize I/O operations in GenerateHeaderFromJson.cmake
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
2024-09-12 22:08:15 +02:00

22 lines
814 B
CMake

# Copyright (c) 2023-present The Bitcoin Core developers
# 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 ${JSON_SOURCE_PATH} hex_content HEX)
string(REGEX REPLACE "................" "\\0\n" formatted_bytes "${hex_content}")
string(REGEX REPLACE "[^\n][^\n]" "0x\\0, " formatted_bytes "${formatted_bytes}")
set(header_content
"#include <string_view>
namespace json_tests {
inline constexpr char detail_${json_source_basename}_bytes[] {
${formatted_bytes}
};
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}")