842b57b775
Whereas it is UB in terms of the standard to delete an array of objects via pointer whose static type doesn't match its dynamic type, MSVC supports an extension allowing to do it. Aside from array deletion not working correctly in the mentioned case, currently not having this extension implemented causes clang to generate code that is not compatible with the code generated by MSVC, because clang always puts scalar deleting destructor to the vftable. This PR aims to resolve these problems. It was reverted due to link time errors in chromium with sanitizer coverage enabled, which is fixed by https://github.com/llvm/llvm-project/pull/131929 . The second commit of this PR also contains a fix for a runtime failure in chromium reported in https://github.com/llvm/llvm-project/pull/126240#issuecomment-2730216384 . Fixes https://github.com/llvm/llvm-project/issues/19772
65 lines
3.3 KiB
C++
65 lines
3.3 KiB
C++
// RUN: %clang_cc1 -std=c++20 %s -emit-llvm -o - -triple x86_64-linux | FileCheck %s --check-prefix=ITANIUM --implicit-check-not=DoNotEmit
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// RUN: %clang_cc1 -std=c++20 %s -emit-llvm -o - -triple x86_64-windows | FileCheck %s --check-prefix=MSABI --implicit-check-not=DoNotEmit
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// FIXME: The MSVC ABI rule in use here was discussed with MS folks prior to
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// them implementing virtual consteval functions, but we do not know for sure
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// if this is the ABI rule they will use.
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// ITANIUM-DAG: @_ZTV1A = {{.*}} constant { [2 x ptr] } {{.*}} null, {{.*}} @_ZTI1A
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// MSABI-DAG: @[[A_VFTABLE:.*]] = {{.*}} constant { [1 x ptr] } {{.*}} @"??_R4A@@6B@"
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struct A {
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virtual consteval void DoNotEmit_f() {}
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};
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// ITANIUM-DAG: @a = {{.*}}global %struct.A { {{.*}} @_ZTV1A,
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// MSABI-DAG: @"?a@@3UA@@A" = {{.*}}global %struct.A { ptr @"??_7A@@6B@" }
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A a;
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// ITANIUM-DAG: @_ZTV1B = {{.*}} constant { [4 x ptr] } {{.*}} null, ptr @_ZTI1B, ptr @_ZN1B1fEv, ptr @_ZN1B1hEv
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// MSABI-DAG: @[[B_VFTABLE:.*]] = {{.*}} constant { [3 x ptr] } {{.*}} @"??_R4B@@6B@", ptr @"?f@B@@UEAAXXZ", ptr @"?h@B@@UEAAXXZ"
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struct B {
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virtual void f() {}
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virtual consteval void DoNotEmit_g() {}
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virtual void h() {}
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};
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// ITANIUM-DAG: @b = {{.*}}global %struct.B { {{.*}} @_ZTV1B,
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// MSABI-DAG: @"?b@@3UB@@A" = {{.*}}global %struct.B { ptr @"??_7B@@6B@" }
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B b;
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// ITANIUM-DAG: @_ZTV1C = {{.*}} constant { [4 x ptr] } {{.*}} null, ptr @_ZTI1C, ptr @_ZN1CD1Ev, ptr @_ZN1CD0Ev
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// MSABI-DAG: @[[C_VFTABLE:.*]] = {{.*}} constant { [2 x ptr] } {{.*}} @"??_R4C@@6B@", ptr @"??_EC@@UEAAPEAXI@Z"
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struct C {
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virtual ~C() = default;
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virtual consteval C &operator=(const C&) = default;
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};
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// ITANIUM-DAG: @c = {{.*}}global %struct.C { {{.*}} @_ZTV1C,
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// MSABI-DAG: @"?c@@3UC@@A" = {{.*}}global %struct.C { ptr @"??_7C@@6B@" }
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C c;
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// ITANIUM-DAG: @_ZTV1D = {{.*}} constant { [4 x ptr] } {{.*}} null, ptr @_ZTI1D, ptr @_ZN1DD1Ev, ptr @_ZN1DD0Ev
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// MSABI-DAG: @[[D_VFTABLE:.*]] = {{.*}} constant { [2 x ptr] } {{.*}} @"??_R4D@@6B@", ptr @"??_ED@@UEAAPEAXI@Z"
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struct D : C {};
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// ITANIUM-DAG: @d = {{.*}}global { ptr } { {{.*}} @_ZTV1D,
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// MSABI-DAG: @"?d@@3UD@@A" = {{.*}}global { ptr } { ptr @"??_7D@@6B@" }
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D d;
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// ITANIUM-DAG: @_ZTV1E = {{.*}} constant { [3 x ptr] } {{.*}} null, ptr @_ZTI1E, ptr @_ZN1E1fEv
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// MSABI-DAG: @[[E_VFTABLE:.*]] = {{.*}} constant { [2 x ptr] } {{.*}} @"??_R4E@@6B@", ptr @"?f@E@@UEAAXXZ"
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struct E { virtual void f() {} };
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// ITANIUM-DAG: @e = {{.*}}global %struct.E { {{.*}} @_ZTV1E,
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// MSABI-DAG: @"?e@@3UE@@A" = {{.*}}global %struct.E { ptr @"??_7E@@6B@" }
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E e;
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// ITANIUM-DAG: @_ZTV1F = {{.*}} constant { [3 x ptr] } {{.*}} null, ptr @_ZTI1F, ptr @_ZN1E1fEv
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// MSABI-DAG: @[[F_VFTABLE:.*]] = {{.*}} constant { [2 x ptr] } {{.*}} @"??_R4F@@6B@", ptr @"?f@E@@UEAAXXZ"
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struct F : E { virtual consteval void DoNotEmit_g(); };
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// ITANIUM-DAG: @f = {{.*}}global { ptr } { {{.*}} @_ZTV1F,
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// MSABI-DAG: @"?f@@3UF@@A" = {{.*}}global { ptr } { ptr @"??_7F@@6B@" }
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F f;
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// MSABI-DAG: @"??_7A@@6B@" = {{.*}} alias {{.*}} @[[A_VFTABLE]],
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// MSABI-DAG: @"??_7B@@6B@" = {{.*}} alias {{.*}} @[[B_VFTABLE]],
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// MSABI-DAG: @"??_7C@@6B@" = {{.*}} alias {{.*}} @[[C_VFTABLE]],
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// MSABI-DAG: @"??_7D@@6B@" = {{.*}} alias {{.*}} @[[D_VFTABLE]],
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// MSABI-DAG: @"??_7E@@6B@" = {{.*}} alias {{.*}} @[[E_VFTABLE]],
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// MSABI-DAG: @"??_7F@@6B@" = {{.*}} alias {{.*}} @[[F_VFTABLE]],
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