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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
118 lines
3.1 KiB
C++
118 lines
3.1 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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#ifndef _LIBCPP_HAS_NO_LOCALIZATION
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// [re.const], regex constants
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namespace regex_constants {
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using std::regex_constants::error_type;
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using std::regex_constants::match_flag_type;
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using std::regex_constants::syntax_option_type;
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// regex_constants is a bitmask type.
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// [bitmask.types] specified operators
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using std::regex_constants::operator&;
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using std::regex_constants::operator&=;
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using std::regex_constants::operator^;
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using std::regex_constants::operator^=;
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using std::regex_constants::operator|;
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using std::regex_constants::operator|=;
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using std::regex_constants::operator~;
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} // namespace regex_constants
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// [re.badexp], class regex_error
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using std::regex_error;
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// [re.traits], class template regex_traits
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using std::regex_traits;
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// [re.regex], class template basic_regex
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using std::basic_regex;
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using std::regex;
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# ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
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using std::wregex;
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# endif
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// [re.regex.swap], basic_regex swap
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using std::swap;
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// [re.submatch], class template sub_match
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using std::sub_match;
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using std::csub_match;
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using std::ssub_match;
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# ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
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using std::wcsub_match;
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using std::wssub_match;
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# endif
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// [re.submatch.op], sub_match non-member operators
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using std::operator==;
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using std::operator<=>;
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using std::operator<<;
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// [re.results], class template match_results
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using std::match_results;
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using std::cmatch;
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using std::smatch;
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# ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
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using std::wcmatch;
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using std::wsmatch;
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# endif
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// match_results comparisons
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// [re.results.swap], match_results swap
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// [re.alg.match], function template regex_match
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using std::regex_match;
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// [re.alg.search], function template regex_search
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using std::regex_search;
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// [re.alg.replace], function template regex_replace
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using std::regex_replace;
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// [re.regiter], class template regex_iterator
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using std::regex_iterator;
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using std::cregex_iterator;
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using std::sregex_iterator;
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# ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
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using std::wcregex_iterator;
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using std::wsregex_iterator;
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# endif
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// [re.tokiter], class template regex_token_iterator
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using std::regex_token_iterator;
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using std::cregex_token_iterator;
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using std::sregex_token_iterator;
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# ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
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using std::wcregex_token_iterator;
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using std::wsregex_token_iterator;
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# endif
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namespace pmr {
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using std::pmr::match_results;
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using std::pmr::cmatch;
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using std::pmr::smatch;
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# ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
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using std::pmr::wcmatch;
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using std::pmr::wsmatch;
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# endif
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} // namespace pmr
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#endif // _LIBCPP_HAS_NO_LOCALIZATION
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} // namespace std
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