ed9584457d
Follow-up to https://github.com/llvm/llvm-project/pull/96932 Adds XFAILed test where LLDB incorrectly infers the alignment of a derived class whose bases are overlapping due to [[no_unique_address]]. Specifically, the `InferAlignment` code-path of the `ItaniumRecordLayoutBuilder` assumes that overlapping base offsets imply a packed structure and thus sets alignment to 1. See discussion in https://github.com/llvm/llvm-project/pull/93809. Also adds test where LLDB correctly infers an alignment of `1` when a packed base class is overlapping with other bases. Lastly, there were a couple of `alignof` inconsistencies which I encapsulated in an XFAIL-ed `packed-alignof.cpp`.
31 lines
757 B
C++
31 lines
757 B
C++
// XFAIL: *
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// RUN: %clangxx_host -gdwarf -o %t %s
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// RUN: %lldb %t \
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// RUN: -o "expr alignof(OverlappingDerived)" \
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// RUN: -o "expr sizeof(OverlappingDerived)" \
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// RUN: -o exit | FileCheck %s
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struct Empty {};
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struct OverlappingBase {
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[[no_unique_address]] Empty e;
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};
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static_assert(sizeof(OverlappingBase) == 1);
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static_assert(alignof(OverlappingBase) == 1);
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struct Base {
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int mem;
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};
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struct OverlappingDerived : Base, OverlappingBase {};
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static_assert(alignof(OverlappingDerived) == 4);
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static_assert(sizeof(OverlappingDerived) == 4);
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// CHECK: (lldb) expr alignof(OverlappingDerived)
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// CHECK-NEXT: ${{.*}} = 4
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// CHECK: (lldb) expr sizeof(OverlappingDerived)
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// CHECK-NEXT: ${{.*}} = 4
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int main() { OverlappingDerived d; }
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