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.
112 lines
2.7 KiB
C++
112 lines
2.7 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++20 %t/a.cppm -emit-module-interface -o %t/a.pcm
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// RUN: %clang_cc1 -std=c++20 %t/b.cppm -emit-module-interface -o %t/b.pcm
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// RUN: %clang_cc1 -std=c++20 %t/c.cppm -emit-module-interface \
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// RUN: -fprebuilt-module-path=%t -o %t/c.pcm
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// RUN: %clang_cc1 -std=c++20 %t/use.cpp -fprebuilt-module-path=%t \
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// RUN: -fsyntax-only -verify
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// Test again with reduced BMI.
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// 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++20 %t/a.cppm -emit-reduced-module-interface -o %t/a.pcm
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// RUN: %clang_cc1 -std=c++20 %t/b.cppm -emit-reduced-module-interface -o %t/b.pcm
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// RUN: %clang_cc1 -std=c++20 %t/c.cppm -emit-reduced-module-interface \
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// RUN: -fprebuilt-module-path=%t -o %t/c.pcm
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// RUN: %clang_cc1 -std=c++20 %t/use.cpp -fprebuilt-module-path=%t \
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// RUN: -fsyntax-only -verify
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//--- foo.h
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#ifndef FOO_H
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#define FOO_H
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template<class _Tp>
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concept __has_member_value_type = requires { typename _Tp::value_type; };
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template<class _Tp>
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concept __has_member_element_type = requires { typename _Tp::element_type; };
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template <class _Tp>
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inline constexpr bool is_object_v = __is_object(_Tp);
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template<class> struct __cond_value_type {};
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template<class _Tp>
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requires is_object_v<_Tp>
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struct __cond_value_type<_Tp> { using value_type = bool; };
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template<class> struct indirectly_readable_traits {
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static constexpr int value = false;
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};
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#endif
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//--- foo.member_value_type.h
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#include "foo.h"
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template<__has_member_value_type _Tp>
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struct indirectly_readable_traits<_Tp> : __cond_value_type<typename _Tp::value_type> {
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static constexpr int value = false;
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};
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//--- foo.memeber_element_type.h
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#include "foo.h"
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template<__has_member_element_type _Tp>
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struct indirectly_readable_traits<_Tp> : __cond_value_type<typename _Tp::element_type> {
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static constexpr int value = false;
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};
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template<__has_member_value_type _Tp>
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requires __has_member_element_type<_Tp>
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struct indirectly_readable_traits<_Tp> {
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static constexpr int value = true;
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};
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//--- foo.a.h
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#include "foo.h"
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#include "foo.member_value_type.h"
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#include "foo.memeber_element_type.h"
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template <typename T>
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using AType = indirectly_readable_traits<T>;
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//--- a.cppm
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module;
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#include "foo.a.h"
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export module a;
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export using ::AType;
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//--- b.cppm
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module;
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#include "foo.h"
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#include "foo.memeber_element_type.h"
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export module b;
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//--- c.cppm
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export module c;
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export import a;
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export import b;
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//--- use.cpp
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// expected-no-diagnostics
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import c;
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template <typename T>
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class U {
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public:
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using value_type = T;
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using element_type = T;
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};
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template <typename T>
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class V {
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public:
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};
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static_assert(!AType<V<int*>>::value);
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static_assert(AType<U<int**>>::value);
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