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[Clang][Backport] Fix handling of reference types in tryEvaluateBuiltinObjectSize (#138247) #139579

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Merged
merged 1 commit into from
May 13, 2025
+17 −3
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[Clang][Backport] Fix handling of reference types in tryEvaluateBuiltinObjectSize (#138247) #139579

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8 changes: 5 additions & 3 deletions clang/lib/AST/ExprConstant.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -12710,11 +12710,13 @@ static bool determineEndOffset(EvalInfo &Info, SourceLocation ExprLoc,
bool DetermineForCompleteObject = refersToCompleteObject(LVal);

auto CheckedHandleSizeof = [&](QualType Ty, CharUnits &Result) {
if (Ty.isNull() || Ty->isIncompleteType() || Ty->isFunctionType())
if (Ty.isNull())
return false;

if (Ty->isReferenceType())
Ty = Ty.getNonReferenceType();
Ty = Ty.getNonReferenceType();

if (Ty->isIncompleteType() || Ty->isFunctionType())
return false;

return HandleSizeof(Info, ExprLoc, Ty, Result);
};
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12 changes: 12 additions & 0 deletions clang/test/SemaCXX/builtin-object-size-cxx14.cpp
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@@ -1,5 +1,7 @@
// RUN: %clang_cc1 -fsyntax-only -verify=expected,cxx14 -std=c++14 %s
// RUN: %clang_cc1 -fsyntax-only -verify -std=c++2a %s
// RUN: %clang_cc1 -fsyntax-only -verify -std=c++2b %s


typedef __SIZE_TYPE__ size_t;

Expand Down Expand Up @@ -119,3 +121,13 @@ constexpr int bos_new() { // cxx14-error {{constant expression}}
void *p = new int; // cxx14-note {{until C++20}}
return __builtin_object_size(p, 0);
}


namespace GH129397 {

struct incomplete;
void test(incomplete &ref) {
__builtin_object_size(&ref, 1);
}

}
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