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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
245 lines
6.4 KiB
C++
245 lines
6.4 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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// [iterator.assoc.types], associated types
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// [incrementable.traits], incrementable traits
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using std::incrementable_traits;
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using std::iter_difference_t;
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using std::indirectly_readable_traits;
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using std::iter_value_t;
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// [iterator.traits], iterator traits
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using std::iterator_traits;
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using std::iter_reference_t;
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namespace ranges {
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// [iterator.cust], customization point objects
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inline namespace __cpo {
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// [iterator.cust.move], ranges::iter_move
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using std::ranges::__cpo::iter_move;
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// [iterator.cust.swap], ranges::iter_swap
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using std::ranges::__cpo::iter_swap;
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} // namespace __cpo
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} // namespace ranges
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using std::iter_rvalue_reference_t;
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// [iterator.concepts], iterator concepts
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// [iterator.concept.readable], concept indirectly_readable
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using std::indirectly_readable;
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using std::iter_common_reference_t;
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// [iterator.concept.writable], concept indirectly_writable
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using std::indirectly_writable;
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// [iterator.concept.winc], concept weakly_incrementable
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using std::weakly_incrementable;
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// [iterator.concept.inc], concept incrementable
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using std::incrementable;
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// [iterator.concept.iterator], concept input_or_output_iterator
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using std::input_or_output_iterator;
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// [iterator.concept.sentinel], concept sentinel_for
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using std::sentinel_for;
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// [iterator.concept.sizedsentinel], concept sized_sentinel_for
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using std::disable_sized_sentinel_for;
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using std::sized_sentinel_for;
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// [iterator.concept.input], concept input_iterator
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using std::input_iterator;
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// [iterator.concept.output], concept output_iterator
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using std::output_iterator;
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// [iterator.concept.forward], concept forward_iterator
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using std::forward_iterator;
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// [iterator.concept.bidir], concept bidirectional_iterator
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using std::bidirectional_iterator;
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// [iterator.concept.random.access], concept random_access_iterator
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using std::random_access_iterator;
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// [iterator.concept.contiguous], concept contiguous_iterator
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using std::contiguous_iterator;
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// [indirectcallable], indirect callable requirements
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// [indirectcallable.indirectinvocable], indirect callables
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using std::indirectly_unary_invocable;
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using std::indirectly_regular_unary_invocable;
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using std::indirect_unary_predicate;
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using std::indirect_binary_predicate;
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using std::indirect_equivalence_relation;
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using std::indirect_strict_weak_order;
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using std::indirect_result_t;
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// [projected], projected
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using std::projected;
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// [alg.req], common algorithm requirements
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// [alg.req.ind.move], concept indirectly_movable
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using std::indirectly_movable;
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using std::indirectly_movable_storable;
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// [alg.req.ind.copy], concept indirectly_copyable
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using std::indirectly_copyable;
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using std::indirectly_copyable_storable;
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// [alg.req.ind.swap], concept indirectly_swappable
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using std::indirectly_swappable;
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// [alg.req.ind.cmp], concept indirectly_comparable
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using std::indirectly_comparable;
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// [alg.req.permutable], concept permutable
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using std::permutable;
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// [alg.req.mergeable], concept mergeable
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using std::mergeable;
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// [alg.req.sortable], concept sortable
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using std::sortable;
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// [iterator.primitives], primitives
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// [std.iterator.tags], iterator tags
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using std::bidirectional_iterator_tag;
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using std::contiguous_iterator_tag;
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using std::forward_iterator_tag;
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using std::input_iterator_tag;
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using std::output_iterator_tag;
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using std::random_access_iterator_tag;
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// [iterator.operations], iterator operations
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using std::advance;
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using std::distance;
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using std::next;
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using std::prev;
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// [range.iter.ops], range iterator operations
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namespace ranges {
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// [range.iter.op.advance], ranges::advance
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using std::ranges::advance;
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// [range.iter.op.distance], ranges::distance
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using std::ranges::distance;
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// [range.iter.op.next], ranges::next
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using std::ranges::next;
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// [range.iter.op.prev], ranges::prev
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using std::ranges::prev;
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} // namespace ranges
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// [predef.iterators], predefined iterators and sentinels
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// [reverse.iterators], reverse iterators
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using std::reverse_iterator;
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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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using std::operator>;
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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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using std::operator-;
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using std::operator+;
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using std::make_reverse_iterator;
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// using std::disable_sized_sentinel_for;
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// [insert.iterators], insert iterators
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using std::back_insert_iterator;
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using std::back_inserter;
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using std::front_insert_iterator;
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using std::front_inserter;
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using std::insert_iterator;
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using std::inserter;
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// [const.iterators], constant iterators and sentinels
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// [const.iterators.alias], alias templates
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// using std::const_iterator;
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// using std::const_sentinel;
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// using std::iter_const_reference_t;
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// [const.iterators.iterator], class template basic_const_iterator
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// using std::basic_const_iterator;
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// using std::common_type;
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// using std::make_const_iterator;
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// [move.iterators], move iterators and sentinels
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using std::move_iterator;
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using std::make_move_iterator;
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using std::move_sentinel;
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using std::common_iterator;
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// [default.sentinel], default sentinel
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using std::default_sentinel;
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using std::default_sentinel_t;
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// [iterators.counted], counted iterators
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using std::counted_iterator;
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// [unreachable.sentinel], unreachable sentinel
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using std::unreachable_sentinel;
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using std::unreachable_sentinel_t;
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// [stream.iterators], stream iterators
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using std::istream_iterator;
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using std::ostream_iterator;
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using std::istreambuf_iterator;
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using std::ostreambuf_iterator;
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// [iterator.range], range access
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using std::begin;
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using std::cbegin;
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using std::cend;
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using std::crbegin;
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using std::crend;
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using std::end;
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using std::rbegin;
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using std::rend;
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using std::empty;
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using std::size;
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using std::ssize;
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using std::data;
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// [depr.iterator]
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using std::iterator;
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} // namespace std
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