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
26 lines
1.1 KiB
C++
26 lines
1.1 KiB
C++
// RUN: %clang_cc1 -fno-rtti-data -O1 -disable-llvm-passes %s -emit-llvm -o - -triple x86_64-windows-msvc | FileCheck %s
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// Even though Foo<int> has an extern template declaration, we have to emit our
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// own copy the vftable when emitting the available externally constructor.
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// CHECK: @"??_7?$Foo@H@@6B@" = linkonce_odr unnamed_addr constant { [1 x ptr] } { [1 x ptr] [
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// CHECK-SAME: ptr @"??_E?$Foo@H@@UEAAPEAXI@Z"
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// CHECK-SAME: ] }, comdat
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// CHECK-LABEL: define dso_local noundef ptr @"?f@@YAPEAU?$Foo@H@@XZ"()
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// CHECK: call noundef ptr @"??0?$Foo@H@@QEAA@XZ"(ptr {{[^,]*}} %{{.*}})
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// CHECK: define available_externally dso_local noundef ptr @"??0?$Foo@H@@QEAA@XZ"(ptr {{[^,]*}} returned align 8 dereferenceable(8) %this)
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// CHECK: store {{.*}} @"??_7?$Foo@H@@6B@"
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// CHECK: define linkonce_odr dso_local noundef ptr @"??_G?$Foo@H@@UEAAPEAXI@Z"(ptr {{[^,]*}} %this, i32 noundef %should_call_delete)
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struct Base {
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virtual ~Base();
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};
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template <typename T> struct Foo : Base {
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Foo() {}
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};
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extern template class Foo<int>;
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Foo<int> *f() { return new Foo<int>(); }
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