[clang][PAC] Fix PAC codegen for final class dynamic_cast optimization (#152227) #152271
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#152227) The codegen for the final class dynamic_cast optimization fails to consider pointer authentication. This change resolves this be simply disabling the optimization when pointer authentication enabled.
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@llvm/pr-subscribers-clang-codegen @llvm/pr-subscribers-clang Author: Oliver Hunt (ojhunt) ChangesThe codegen for the final class dynamic_cast optimization fails to consider pointer authentication. This change resolves this be simply disabling the optimization when pointer authentication enabled. Full diff: https://github.com/llvm/llvm-project/pull/152271.diff 2 Files Affected:
diff --git a/clang/lib/CodeGen/CGExprCXX.cpp b/clang/lib/CodeGen/CGExprCXX.cpp
index 359e30cb8f5cd..912b1d72c7e23 100644
--- a/clang/lib/CodeGen/CGExprCXX.cpp
+++ b/clang/lib/CodeGen/CGExprCXX.cpp
@@ -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
diff --git a/clang/test/CodeGenCXX/dynamic-cast-exact-disabled.cpp b/clang/test/CodeGenCXX/dynamic-cast-exact-disabled.cpp
index 9a8ce1997a7f9..19c2a9bd0497e 100644
--- a/clang/test/CodeGenCXX/dynamic-cast-exact-disabled.cpp
+++ b/clang/test/CodeGenCXX/dynamic-cast-exact-disabled.cpp
@@ -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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/cherry-pick 7268478 |
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/pull-request #152586 |
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The codegen for the final class dynamic_cast optimization fails to consider pointer authentication. This change resolves this be simply disabling the optimization when pointer authentication enabled.