da00c60dae
Close https://github.com/llvm/llvm-project/issues/71034 See https://discourse.llvm.org/t/rfc-c-20-modules-introduce-thin-bmi-and-decls-hash/74755 This patch introduces reduced BMI, which doesn't contain the definitions of functions and variables if its definitions won't contribute to the ABI. Testing is a big part of the patch. We want to make sure the reduced BMI contains the same behavior with the existing and relatively stable fatBMI. This is pretty helpful for further reduction. The user interfaces part it left to following patches to ease the reviewing.
83 lines
1.5 KiB
C++
83 lines
1.5 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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//--- 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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