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`.
44 lines
1.0 KiB
C++
44 lines
1.0 KiB
C++
// XFAIL: *
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//
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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(base)" \
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// RUN: -o "expr alignof(packed_base)" \
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// RUN: -o "expr alignof(derived)" \
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// RUN: -o "expr sizeof(derived)" \
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// RUN: -o exit | FileCheck %s
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struct __attribute__((packed)) packed {
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int x;
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char y;
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int z;
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} g_packed_struct;
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// LLDB incorrectly calculates alignof(base)
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struct foo {};
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struct base : foo { int x; };
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static_assert(alignof(base) == 4);
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// CHECK: (lldb) expr alignof(base)
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// CHECK-NEXT: ${{.*}} = 4
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// LLDB incorrectly calculates alignof(packed_base)
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struct __attribute__((packed)) packed_base { int x; };
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static_assert(alignof(packed_base) == 1);
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// CHECK: (lldb) expr alignof(packed_base)
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// CHECK-NEXT: ${{.*}} = 1
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struct derived : packed, packed_base {
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short s;
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} g_derived;
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static_assert(alignof(derived) == 2);
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static_assert(sizeof(derived) == 16);
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// CHECK: (lldb) expr alignof(derived)
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// CHECK-NEXT: ${{.*}} = 2
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// CHECK: (lldb) expr sizeof(derived)
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// CHECK-NEXT: ${{.*}} = 16
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int main() {}
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