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.
87 lines
2.7 KiB
C++
87 lines
2.7 KiB
C++
// RUN: rm -rf %t
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// RUN: split-file %s %t
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// RUN: cd %t
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//
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// RUN: %clang_cc1 -std=c++20 %t/A-B.cppm -I%t -emit-module-interface -o %t/A-B.pcm
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// RUN: %clang_cc1 -std=c++20 %t/A-C.cppm -I%t -emit-module-interface -o %t/A-C.pcm
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// RUN: %clang_cc1 -std=c++20 %t/A.cppm -emit-module-interface -fprebuilt-module-path=%t -o %t/A.pcm
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// RUN: %clang_cc1 -std=c++20 -fprebuilt-module-path=%t %t/Use.cpp -verify -fsyntax-only
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// Test again with reduced BMI.
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//
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// RUN: %clang_cc1 -std=c++20 %t/A-B.cppm -I%t -emit-reduced-module-interface -o %t/A-B.pcm
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// RUN: %clang_cc1 -std=c++20 %t/A-C.cppm -I%t -emit-reduced-module-interface -o %t/A-C.pcm
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// RUN: %clang_cc1 -std=c++20 %t/A.cppm -emit-reduced-module-interface -fprebuilt-module-path=%t -o %t/A.pcm
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// RUN: %clang_cc1 -std=c++20 -fprebuilt-module-path=%t %t/Use.cpp -verify -fsyntax-only
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//--- foo.h
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template <typename U, typename T>
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class pair {};
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template <typename U>
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class allocator {};
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template <typename T>
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class my_traits {};
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template <class _Key, class _Tp,
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class _Alloc = allocator<pair<const _Key, _Tp> > >
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class unordered_map
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{
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public:
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unordered_map() {}
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};
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template<bool, class = void> struct my_enable_if {};
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template<class T> struct my_enable_if<true, T> { using type = T; };
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template<bool B, class T = void> using my_enable_if_t = typename my_enable_if<B, T>::type;
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template<class _InputIterator,
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class _Allocator = allocator<my_traits<_InputIterator>>,
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class = my_enable_if_t<_InputIterator::value>>
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unordered_map(_InputIterator, _InputIterator, _Allocator = _Allocator())
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-> unordered_map<my_traits<_InputIterator>, my_traits<_InputIterator>, _Allocator>;
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template <class _CharT,
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class _Traits = my_traits<_CharT>,
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class _Allocator = allocator<_CharT> >
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class basic_string;
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typedef basic_string<char, my_traits<char>, allocator<char> > string;
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template<class _CharT, class _Traits, class _Allocator>
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class basic_string
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{
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public:
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basic_string();
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template<class _InputIterator, class = my_enable_if_t<_InputIterator::value> >
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basic_string(_InputIterator __first, _InputIterator __last, const _Allocator& __a);
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void resize(unsigned __n, _CharT __c);
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};
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extern template void basic_string<char>::resize(unsigned, char);
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//--- A-B.cppm
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module;
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#include "foo.h"
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export module A:B;
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export using ::string;
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//--- A-C.cppm
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module;
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#include "foo.h"
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export module A:C;
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//--- A.cppm
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export module A;
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export import :B;
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export import :C;
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//--- Use.cpp
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import A;
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string s;
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::unordered_map<int, int> mime_map; // expected-error {{missing '#include'; 'unordered_map' must be declared before it is used}}
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// expected-note@* {{declaration here is not visible}}
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