bitcoin/cmake/script/GenerateHeaderFromRaw.cmake
Lőrinc aa003d1568 build: Minimize I/O operations in GenerateHeaderFromRaw.cmake
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
2024-09-12 22:08:15 +02:00

23 lines
771 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 RAW_SOURCE_PATH STEM raw_source_basename)
file(READ ${RAW_SOURCE_PATH} hex_content HEX)
string(REGEX REPLACE "................" "\\0\n" formatted_bytes "${hex_content}")
string(REGEX REPLACE "[^\n][^\n]" "std::byte{0x\\0}, " formatted_bytes "${formatted_bytes}")
set(header_content
"#include <cstddef>
#include <span>
namespace ${RAW_NAMESPACE} {
inline constexpr std::byte detail_${raw_source_basename}_raw[] {
${formatted_bytes}
};
inline constexpr std::span ${raw_source_basename}{detail_${raw_source_basename}_raw};
}
")
file(WRITE ${HEADER_PATH} "${header_content}")