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4d4c70c91c
This patch is based on the suggestion by @ChuanqiXu on discourse (https://discourse.llvm.org/t/alternatives-to-the-implementation-of-std-modules/71958) Instead of making a module partition per header every header gets an inc file which contains the exports per header. The std module then includes all public headers and these inc files. The one file per header is useful for testing purposes. The CI tests whether the exports of a header's module partition matches the "public" named declarations in the header. With one file per header this can still be done. The patch improves compilation time of files using "import std;" and the size of the std module. A comparision of the compilation speed using a libc++ test build/bin/llvm-lit -a -Dstd=c++23 -Denable_modules=std libcxx/test/std/modules/std.pass.cpp Which boils down to import std; int main(int, char**) { std::println("Hello modular world"); return 0; } and has -ftime-report enabled Before ===-------------------------------------------------------------------------=== Clang front-end time report ===-------------------------------------------------------------------------=== Total Execution Time: 8.6585 seconds (8.6619 wall clock) ---User Time--- --System Time-- --User+System-- ---Wall Time--- --- Name --- 4.5041 ( 57.2%) 0.4264 ( 54.4%) 4.9305 ( 56.9%) 4.9331 ( 57.0%) Clang front-end timer 3.2037 ( 40.7%) 0.2408 ( 30.7%) 3.4445 ( 39.8%) 3.4452 ( 39.8%) Reading modules 0.1665 ( 2.1%) 0.1170 ( 14.9%) 0.2835 ( 3.3%) 0.2837 ( 3.3%) Loading .../build/test/__config_module__/CMakeFiles/std.dir/std.pcm 7.8744 (100.0%) 0.7842 (100.0%) 8.6585 (100.0%) 8.6619 (100.0%) Total After ===-------------------------------------------------------------------------=== Clang front-end time report ===-------------------------------------------------------------------------=== Total Execution Time: 1.2420 seconds (1.2423 wall clock) ---User Time--- --System Time-- --User+System-- ---Wall Time--- --- Name --- 0.8892 ( 84.6%) 0.1698 ( 88.8%) 1.0590 ( 85.3%) 1.0590 ( 85.2%) Clang front-end timer 0.1533 ( 14.6%) 0.0168 ( 8.8%) 0.1701 ( 13.7%) 0.1704 ( 13.7%) Reading modules 0.0082 ( 0.8%) 0.0047 ( 2.5%) 0.0129 ( 1.0%) 0.0129 ( 1.0%) Loading .../build/test/__config_module__/CMakeFiles/std.dir/std.pcm 1.0507 (100.0%) 0.1913 (100.0%) 1.2420 (100.0%) 1.2423 (100.0%) Total Using "include <print>" instead of "import module;" ===-------------------------------------------------------------------------=== Clang front-end time report ===-------------------------------------------------------------------------=== Total Execution Time: 2.1507 seconds (2.1517 wall clock) ---User Time--- --System Time-- --User+System-- ---Wall Time--- --- Name --- 1.9714 (100.0%) 0.1793 (100.0%) 2.1507 (100.0%) 2.1517 (100.0%) Clang front-end timer 1.9714 (100.0%) 0.1793 (100.0%) 2.1507 (100.0%) 2.1517 (100.0%) Total It's possible to use the std module in external projects (https://libcxx.llvm.org/Modules.html#using-in-external-projects) Tested this with a private project to validate the size of the generated files: Before $ du -sch std-* 448M std-build 508K std-src 120K std-subbuild 449M total After $ du -sch std-* 29M std-build 1004K std-src 132K std-subbuild 30M total Reviewed By: ldionne, #libc Differential Revision: https://reviews.llvm.org/D156907
51 lines
1.4 KiB
C++
51 lines
1.4 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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export namespace std {
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// signed
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using std::int8_t _LIBCPP_USING_IF_EXISTS;
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using std::int16_t _LIBCPP_USING_IF_EXISTS;
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using std::int32_t _LIBCPP_USING_IF_EXISTS;
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using std::int64_t _LIBCPP_USING_IF_EXISTS;
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using std::int_fast16_t;
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using std::int_fast32_t;
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using std::int_fast64_t;
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using std::int_fast8_t;
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using std::int_least16_t;
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using std::int_least32_t;
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using std::int_least64_t;
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using std::int_least8_t;
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using std::intmax_t;
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using std::intptr_t _LIBCPP_USING_IF_EXISTS;
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// unsigned
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using std::uint8_t _LIBCPP_USING_IF_EXISTS;
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using std::uint16_t _LIBCPP_USING_IF_EXISTS;
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using std::uint32_t _LIBCPP_USING_IF_EXISTS;
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using std::uint64_t _LIBCPP_USING_IF_EXISTS;
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using std::uint_fast16_t;
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using std::uint_fast32_t;
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using std::uint_fast64_t;
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using std::uint_fast8_t;
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using std::uint_least16_t;
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using std::uint_least32_t;
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using std::uint_least64_t;
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using std::uint_least8_t;
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using std::uintmax_t;
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using std::uintptr_t _LIBCPP_USING_IF_EXISTS;
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} // namespace std
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