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release/21.x: [clang][PAC] Fix PAC codegen for final class dynamic_cast optimization (#152227) #152586

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Merged
tru merged 1 commit into from
Aug 8, 2025
Merged

release/21.x: [clang][PAC] Fix PAC codegen for final class dynamic_cast optimization (#152227) #152586

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3 changes: 2 additions & 1 deletion clang/lib/CodeGen/CGExprCXX.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2313,7 +2313,8 @@ llvm::Value *CodeGenFunction::EmitDynamicCast(Address ThisAddr,
bool IsExact = !IsDynamicCastToVoid &&
CGM.getCodeGenOpts().OptimizationLevel > 0 &&
DestRecordTy->getAsCXXRecordDecl()->isEffectivelyFinal() &&
CGM.getCXXABI().shouldEmitExactDynamicCast(DestRecordTy);
CGM.getCXXABI().shouldEmitExactDynamicCast(DestRecordTy) &&
!getLangOpts().PointerAuthCalls;

// C++ [expr.dynamic.cast]p4:
// If the value of v is a null pointer value in the pointer case, the result
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1 change: 1 addition & 0 deletions clang/test/CodeGenCXX/dynamic-cast-exact-disabled.cpp
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Expand Up @@ -3,6 +3,7 @@
// RUN: %clang_cc1 -I%S %s -triple x86_64-apple-darwin10 -O1 -fvisibility=hidden -emit-llvm -std=c++11 -o - | FileCheck %s --check-prefixes=CHECK,INEXACT
// RUN: %clang_cc1 -I%S %s -triple x86_64-apple-darwin10 -O1 -fapple-kext -emit-llvm -std=c++11 -o - | FileCheck %s --check-prefixes=CHECK,INEXACT
// RUN: %clang_cc1 -I%S %s -triple x86_64-apple-darwin10 -O1 -fno-assume-unique-vtables -emit-llvm -std=c++11 -o - | FileCheck %s --check-prefixes=CHECK,INEXACT
// RUN: %clang_cc1 -I%S %s -triple arm64e-apple-darwin10 -O1 -fptrauth-calls -emit-llvm -std=c++11 -o - | FileCheck %s --check-prefixes=CHECK,INEXACT

struct A { virtual ~A(); };
struct B final : A { };
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