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.
52 lines
1.5 KiB
C++
52 lines
1.5 KiB
C++
// Tests that the declaration won't get emitted after being merged.
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//
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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 -triple %itanium_abi_triple %t/A.cppm -emit-module-interface -o %t/A.pcm
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// RUN: %clang_cc1 -std=c++20 -triple %itanium_abi_triple %t/B.cppm -emit-module-interface -o %t/B.pcm \
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// RUN: -fprebuilt-module-path=%t
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// RUN: %clang_cc1 -std=c++20 -triple %itanium_abi_triple %t/B.pcm -S -emit-llvm -o - \
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// RUN: -fprebuilt-module-path=%t | FileCheck %t/B.cppm
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// Test again with reduced BMI. Note that we need to generate full BMI for B.cppm
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// since it is required to generate backend codes.
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// RUN: rm %t/A.pcm %t/B.pcm
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// RUN: %clang_cc1 -std=c++20 -triple %itanium_abi_triple %t/A.cppm -emit-reduced-module-interface -o %t/A.pcm
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// RUN: %clang_cc1 -std=c++20 -triple %itanium_abi_triple %t/B.cppm -emit-module-interface -o %t/B.pcm \
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// RUN: -fprebuilt-module-path=%t
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// RUN: %clang_cc1 -std=c++20 -triple %itanium_abi_triple %t/B.pcm -S -emit-llvm -o - \
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// RUN: -fprebuilt-module-path=%t | FileCheck %t/B.cppm
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//--- foo.h
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template <class T>
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class foo {
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public:
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T value;
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T GetValue() { return value; }
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};
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template class foo<int>;
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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 ::foo;
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//--- B.cppm
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module;
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#include "foo.h"
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export module B;
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import A;
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export using ::foo;
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export int B() {
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foo<int> f;
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return f.GetValue();
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}
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// CHECK-NOT: define{{.*}}@_ZN3fooIiE8GetValueEv
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