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.
50 lines
2.2 KiB
C++
50 lines
2.2 KiB
C++
// RUN: rm -rf %t
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// RUN: mkdir %t
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// RUN: split-file %s %t
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//
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// RUN: %clang_cc1 -std=c++20 -emit-module-interface %t/var_def.cppm -o %t/var_def.pcm
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// RUN: %clang_cc1 -std=c++20 -emit-module-interface -fprebuilt-module-path=%t %t/reexport1.cppm -o %t/reexport1.pcm
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// RUN: %clang_cc1 -std=c++20 -emit-module-interface -fprebuilt-module-path=%t %t/reexport2.cppm -o %t/reexport2.pcm
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// RUN: %clang_cc1 -std=c++20 -fprebuilt-module-path=%t %t/use.cppm -fsyntax-only -verify
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// RUN: %clang_cc1 -std=c++20 -emit-reduced-module-interface %t/var_def.cppm -o %t/var_def.pcm
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// RUN: %clang_cc1 -std=c++20 -emit-reduced-module-interface -fprebuilt-module-path=%t %t/reexport1.cppm -o %t/reexport1.pcm
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// RUN: %clang_cc1 -std=c++20 -emit-reduced-module-interface -fprebuilt-module-path=%t %t/reexport2.cppm -o %t/reexport2.pcm
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// RUN: %clang_cc1 -std=c++20 -fprebuilt-module-path=%t %t/use.cppm -fsyntax-only -verify
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//--- use.cppm
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import reexport1;
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import reexport2;
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auto foo = zero<Int>;
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auto bar = zero<int*>;
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auto baz = zero<int>;
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template <class T> constexpr T zero = 0; // expected-error-re {{declaration{{.*}}in the global module follows declaration in module var_def}}
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// expected-note@* {{previous}}
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template <> constexpr Int zero<Int> = {0}; // expected-error-re {{declaration{{.*}}in the global module follows declaration in module var_def}}
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// expected-note@* {{previous}}
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template <class T> constexpr T* zero<T*> = nullptr; // expected-error-re {{declaration{{.*}}in the global module follows declaration in module var_def}}
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// expected-note@* {{previous}}
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template <> constexpr int** zero<int**> = nullptr; // ok, new specialization.
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template <class T> constexpr T** zero<T**> = nullptr; // ok, new partial specilization.
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//--- var_def.cppm
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export module var_def;
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export template <class T> constexpr T zero = 0;
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export struct Int {
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int value;
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};
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export template <> constexpr Int zero<Int> = {0};
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export template <class T> constexpr T* zero<T*> = nullptr;
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//--- reexport1.cppm
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export module reexport1;
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export import var_def;
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//--- reexport2.cppm
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export module reexport2;
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export import var_def;
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