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[clang][bytecode] Fix a crash in __builtin_object_size() #160519

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Merged
merged 1 commit into from
Oct 7, 2025
Merged

[clang][bytecode] Fix a crash in __builtin_object_size() #160519

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12 changes: 8 additions & 4 deletions clang/lib/AST/ByteCode/InterpBuiltin.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2449,10 +2449,14 @@ static bool interp__builtin_object_size(InterpState &S, CodePtr OpPC,
if (Ptr.isBaseClass())
ByteOffset = computePointerOffset(ASTCtx, Ptr.getBase()) -
computePointerOffset(ASTCtx, Ptr);
else
ByteOffset =
computePointerOffset(ASTCtx, Ptr) -
computePointerOffset(ASTCtx, Ptr.expand().atIndex(0).narrow());
else {
if (Ptr.inArray())
ByteOffset =
computePointerOffset(ASTCtx, Ptr) -
computePointerOffset(ASTCtx, Ptr.expand().atIndex(0).narrow());
else
ByteOffset = 0;
}
} else
ByteOffset = computePointerOffset(ASTCtx, Ptr);

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3 changes: 2 additions & 1 deletion clang/test/AST/ByteCode/builtin-object-size.cpp
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Expand Up @@ -17,7 +17,8 @@ static_assert(__builtin_object_size(&arrf, 0) == (sizeof(float)*2), "");
static_assert(__builtin_object_size(&arrf[1], 0) == sizeof(float), "");
static_assert(__builtin_object_size(&arrf[2], 0) == 0, "");


constexpr struct { int a; int b; } F{};
static_assert(__builtin_object_size(&F.a, 3) == sizeof(int));

struct S {
int a;
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