f21ead0675
Following of https://github.com/llvm/llvm-project/pull/76930 This follows the idea of "only writes what we writes", which I think is the most natural and efficient way to implement this optimization. We start writing the BMI from the first declaration in module purview instead of the global module fragment, so that everything in the GMF untouched won't be written in the BMI naturally. The exception is, as I said in https://github.com/llvm/llvm-project/pull/76930, when we write a declaration we need to write its decl context, and when we write the decl context, we need to write everything from it. So when we see `std::vector`, we basically need to write everything under namespace std. This violates our intention. To fix this, this patch delays the writing of namespace in the GMF. From my local measurement, the size of the BMI decrease to 90M from 112M for a local modules build. I think this is significant. This feature will be covered under the experimental reduced BMI so that it won't affect any existing users. So I'd like to land this when the CI gets green. Documents will be added seperately.
87 lines
1.6 KiB
C++
87 lines
1.6 KiB
C++
// RUN: rm -rf %t
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// RUN: mkdir -p %t
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// RUN: split-file %s %t
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//
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// RUN: %clang_cc1 -std=c++23 -emit-module-interface %t/a.cppm -o %t/a.pcm
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// RUN: %clang_cc1 -std=c++23 %t/b.cpp -fmodule-file=a=%t/a.pcm -fsyntax-only -verify
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// RUN: %clang_cc1 -std=c++23 -emit-reduced-module-interface %t/a.cppm -o %t/a.pcm
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// RUN: %clang_cc1 -std=c++23 %t/b.cpp -fmodule-file=a=%t/a.pcm -fsyntax-only -verify
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//--- foo.h
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class TypeA {};
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template<class _Tp, class _Up>
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concept __comparable = requires (_Tp &&__t, _Up &&__u) {
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__t == __u;
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};
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namespace ranges {
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namespace __end {
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template <class _Tp>
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concept __member_end =
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requires(_Tp&& __t) {
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{ __t.end() } -> __comparable<TypeA>;
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};
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struct __fn {
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template <class _Tp>
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requires __member_end<_Tp>
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constexpr auto operator()(_Tp&& __t) const
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{
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return true;
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}
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void operator()(auto&&) const = delete;
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};
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}
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inline namespace __cpo {
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inline constexpr auto end = __end::__fn{};
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}
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}
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template <class _Tp>
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concept range = requires(_Tp& __t) {
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ranges::end(__t);
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};
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template <class T>
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class a {
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public:
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a(T*) {}
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TypeA end() { return {}; }
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};
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template <class T>
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class a_view {
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public:
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template <class U>
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a_view(a<U>) {}
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};
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template <range _Range>
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a_view(_Range) -> a_view<int>;
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constexpr bool operator==(TypeA, TypeA) {
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return true;
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}
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//--- a.cppm
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module;
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#include "foo.h"
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export module a;
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export using ::a;
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export using ::a_view;
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// We need to mention the 'operator==' explicitly to make sure it won't be
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// discarded.
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export using ::operator==;
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//--- b.cpp
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// expected-no-diagnostics
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import a;
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void use() {
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auto _ = a{"char"};
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auto __ = a_view{_};
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}
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