46e848a23b
Adds test that checks whether LLDB correctly infers the alignment of packed structures. Specifically, the `InferAlignment` code-path of the `ItaniumRecordLayoutBuilder` where it assumes that overlapping field offsets imply a packed structure and thus sets alignment to `1`. See discussion in https://github.com/llvm/llvm-project/pull/93809. While here, also added a test-case where we check alignment of a class whose base has an explicit `DW_AT_alignment (those don't get transitively propagated in DWARF, but don't seem like a problem for LLDB). Lastly, also added an XFAIL-ed tests where the aforementioned `InferAlignment` kicks in for overlapping fields (but in this case incorrectly since the structure isn't actually packed).
25 lines
595 B
C++
25 lines
595 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(OverlappingFields)" \
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// RUN: -o "expr sizeof(OverlappingFields)" \
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// RUN: -o exit | FileCheck %s
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// CHECK: (lldb) expr alignof(OverlappingFields)
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// CHECK-NEXT: ${{.*}} = 4
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// CHECK: (lldb) expr sizeof(OverlappingFields)
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// CHECK-NEXT: ${{.*}} = 8
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struct Empty {};
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struct OverlappingFields {
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char y;
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[[no_unique_address]] Empty e;
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int z;
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} g_overlapping_struct;
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static_assert(alignof(OverlappingFields) == 4);
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static_assert(sizeof(OverlappingFields) == 8);
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int main() {}
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