[clang] 9c89b29 - -fsanitize=function: fix MSVC hashing to sugared type (#66816)
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cfe-commits at lists.llvm.org
Mon Oct 2 10:09:44 PDT 2023
Author: Matheus Izvekov
Date: 2023-10-02T19:09:39+02:00
New Revision: 9c89b29555a7ccfc3942340f558c3bbea8d10532
URL: https://github.com/llvm/llvm-project/commit/9c89b29555a7ccfc3942340f558c3bbea8d10532
DIFF: https://github.com/llvm/llvm-project/commit/9c89b29555a7ccfc3942340f558c3bbea8d10532.diff
LOG: -fsanitize=function: fix MSVC hashing to sugared type (#66816)
Hashing the sugared type instead of the canonical type meant that
a simple example like this would always fail under MSVC:
```
static auto l() {}
int main() {
auto a = l;
a();
}
```
`clang --target=x86_64-pc-windows-msvc -fno-exceptions
-fsanitize=function -g -O0 -fuse-ld=lld -o test.exe test.cc`
produces:
```
test.cc:4:3: runtime error: call to function l through pointer to incorrect function type 'void (*)()'
```
Added:
Modified:
clang/include/clang/AST/Mangle.h
clang/lib/AST/Expr.cpp
clang/lib/AST/ItaniumMangle.cpp
clang/lib/AST/MicrosoftMangle.cpp
clang/lib/CodeGen/CGBlocks.cpp
clang/lib/CodeGen/CGOpenMPRuntime.cpp
clang/lib/CodeGen/CGVTables.cpp
clang/lib/CodeGen/CodeGenFunction.cpp
clang/lib/CodeGen/CodeGenModule.cpp
clang/lib/CodeGen/CodeGenTBAA.cpp
clang/test/CodeGen/ubsan-function-sugared.cpp
clang/unittests/AST/DeclTest.cpp
Removed:
################################################################################
diff --git a/clang/include/clang/AST/Mangle.h b/clang/include/clang/AST/Mangle.h
index c04bcc7f01cb4e6..e586b0cec43dfd6 100644
--- a/clang/include/clang/AST/Mangle.h
+++ b/clang/include/clang/AST/Mangle.h
@@ -178,8 +178,8 @@ class MangleContext {
/// or type uniquing.
/// TODO: Extend this to internal types by generating names that are unique
/// across translation units so it can be used with LTO.
- virtual void mangleTypeName(QualType T, raw_ostream &,
- bool NormalizeIntegers = false) = 0;
+ virtual void mangleCanonicalTypeName(QualType T, raw_ostream &,
+ bool NormalizeIntegers = false) = 0;
/// @}
};
diff --git a/clang/lib/AST/Expr.cpp b/clang/lib/AST/Expr.cpp
index a718d320a462960..99e89aeafc24217 100644
--- a/clang/lib/AST/Expr.cpp
+++ b/clang/lib/AST/Expr.cpp
@@ -661,7 +661,7 @@ std::string SYCLUniqueStableNameExpr::ComputeName(ASTContext &Context,
std::string Buffer;
Buffer.reserve(128);
llvm::raw_string_ostream Out(Buffer);
- Ctx->mangleTypeName(Ty, Out);
+ Ctx->mangleCanonicalTypeName(Ty, Out);
return Out.str();
}
diff --git a/clang/lib/AST/ItaniumMangle.cpp b/clang/lib/AST/ItaniumMangle.cpp
index a2a001e1214bdd1..23ec35cae4b7b40 100644
--- a/clang/lib/AST/ItaniumMangle.cpp
+++ b/clang/lib/AST/ItaniumMangle.cpp
@@ -112,8 +112,8 @@ class ItaniumMangleContextImpl : public ItaniumMangleContext {
void mangleCXXRTTI(QualType T, raw_ostream &) override;
void mangleCXXRTTIName(QualType T, raw_ostream &,
bool NormalizeIntegers) override;
- void mangleTypeName(QualType T, raw_ostream &,
- bool NormalizeIntegers) override;
+ void mangleCanonicalTypeName(QualType T, raw_ostream &,
+ bool NormalizeIntegers) override;
void mangleCXXCtorComdat(const CXXConstructorDecl *D, raw_ostream &) override;
void mangleCXXDtorComdat(const CXXDestructorDecl *D, raw_ostream &) override;
@@ -7132,8 +7132,8 @@ void ItaniumMangleContextImpl::mangleCXXRTTIName(
Mangler.mangleType(Ty);
}
-void ItaniumMangleContextImpl::mangleTypeName(QualType Ty, raw_ostream &Out,
- bool NormalizeIntegers = false) {
+void ItaniumMangleContextImpl::mangleCanonicalTypeName(
+ QualType Ty, raw_ostream &Out, bool NormalizeIntegers = false) {
mangleCXXRTTIName(Ty, Out, NormalizeIntegers);
}
diff --git a/clang/lib/AST/MicrosoftMangle.cpp b/clang/lib/AST/MicrosoftMangle.cpp
index 7db18cf14eb40b6..f6d8cdee8443d59 100644
--- a/clang/lib/AST/MicrosoftMangle.cpp
+++ b/clang/lib/AST/MicrosoftMangle.cpp
@@ -196,8 +196,8 @@ class MicrosoftMangleContextImpl : public MicrosoftMangleContext {
mangleCXXRTTICompleteObjectLocator(const CXXRecordDecl *Derived,
ArrayRef<const CXXRecordDecl *> BasePath,
raw_ostream &Out) override;
- void mangleTypeName(QualType T, raw_ostream &,
- bool NormalizeIntegers) override;
+ void mangleCanonicalTypeName(QualType T, raw_ostream &,
+ bool NormalizeIntegers) override;
void mangleReferenceTemporary(const VarDecl *, unsigned ManglingNumber,
raw_ostream &) override;
void mangleStaticGuardVariable(const VarDecl *D, raw_ostream &Out) override;
@@ -3842,13 +3842,13 @@ void MicrosoftMangleContextImpl::mangleSEHFinallyBlock(
Mangler.mangleName(EnclosingDecl);
}
-void MicrosoftMangleContextImpl::mangleTypeName(
+void MicrosoftMangleContextImpl::mangleCanonicalTypeName(
QualType T, raw_ostream &Out, bool NormalizeIntegers = false) {
// This is just a made up unique string for the purposes of tbaa. undname
// does *not* know how to demangle it.
MicrosoftCXXNameMangler Mangler(*this, Out);
Mangler.getStream() << '?';
- Mangler.mangleType(T, SourceRange());
+ Mangler.mangleType(T.getCanonicalType(), SourceRange());
}
void MicrosoftMangleContextImpl::mangleReferenceTemporary(
diff --git a/clang/lib/CodeGen/CGBlocks.cpp b/clang/lib/CodeGen/CGBlocks.cpp
index aa3e730d28efae5..27f525ee35edbf9 100644
--- a/clang/lib/CodeGen/CGBlocks.cpp
+++ b/clang/lib/CodeGen/CGBlocks.cpp
@@ -1710,7 +1710,7 @@ static std::string getBlockCaptureStr(const CGBlockInfo::Capture &Cap,
Str += "c";
SmallString<256> TyStr;
llvm::raw_svector_ostream Out(TyStr);
- CGM.getCXXABI().getMangleContext().mangleTypeName(CaptureTy, Out);
+ CGM.getCXXABI().getMangleContext().mangleCanonicalTypeName(CaptureTy, Out);
Str += llvm::to_string(TyStr.size()) + TyStr.c_str();
break;
}
diff --git a/clang/lib/CodeGen/CGOpenMPRuntime.cpp b/clang/lib/CodeGen/CGOpenMPRuntime.cpp
index 8faee62566f81e2..45ed7fe052dec26 100644
--- a/clang/lib/CodeGen/CGOpenMPRuntime.cpp
+++ b/clang/lib/CodeGen/CGOpenMPRuntime.cpp
@@ -9069,7 +9069,7 @@ void CGOpenMPRuntime::emitUserDefinedMapper(const OMPDeclareMapperDecl *D,
llvm::FunctionType *FnTy = CGM.getTypes().GetFunctionType(FnInfo);
SmallString<64> TyStr;
llvm::raw_svector_ostream Out(TyStr);
- CGM.getCXXABI().getMangleContext().mangleTypeName(Ty, Out);
+ CGM.getCXXABI().getMangleContext().mangleCanonicalTypeName(Ty, Out);
std::string Name = getName({"omp_mapper", TyStr, D->getName()});
auto *Fn = llvm::Function::Create(FnTy, llvm::GlobalValue::InternalLinkage,
Name, &CGM.getModule());
diff --git a/clang/lib/CodeGen/CGVTables.cpp b/clang/lib/CodeGen/CGVTables.cpp
index 2f1ac37b3af77aa..d782da2103b4c79 100644
--- a/clang/lib/CodeGen/CGVTables.cpp
+++ b/clang/lib/CodeGen/CGVTables.cpp
@@ -1316,6 +1316,7 @@ void CodeGenModule::EmitVTableTypeMetadata(const CXXRecordDecl *RD,
AP.second.AddressPointIndex));
// Sort the address points for determinism.
+ // FIXME: It's more efficient to mangle the types before sorting.
llvm::sort(AddressPoints, [this](const AddressPoint &AP1,
const AddressPoint &AP2) {
if (&AP1 == &AP2)
@@ -1323,13 +1324,13 @@ void CodeGenModule::EmitVTableTypeMetadata(const CXXRecordDecl *RD,
std::string S1;
llvm::raw_string_ostream O1(S1);
- getCXXABI().getMangleContext().mangleTypeName(
+ getCXXABI().getMangleContext().mangleCanonicalTypeName(
QualType(AP1.first->getTypeForDecl(), 0), O1);
O1.flush();
std::string S2;
llvm::raw_string_ostream O2(S2);
- getCXXABI().getMangleContext().mangleTypeName(
+ getCXXABI().getMangleContext().mangleCanonicalTypeName(
QualType(AP2.first->getTypeForDecl(), 0), O2);
O2.flush();
diff --git a/clang/lib/CodeGen/CodeGenFunction.cpp b/clang/lib/CodeGen/CodeGenFunction.cpp
index 3eb4cb8756c731c..9b21f428b0af7f5 100644
--- a/clang/lib/CodeGen/CodeGenFunction.cpp
+++ b/clang/lib/CodeGen/CodeGenFunction.cpp
@@ -576,7 +576,7 @@ CodeGenFunction::getUBSanFunctionTypeHash(QualType Ty) const {
Ty = getContext().getFunctionTypeWithExceptionSpec(Ty, EST_None);
std::string Mangled;
llvm::raw_string_ostream Out(Mangled);
- CGM.getCXXABI().getMangleContext().mangleTypeName(Ty, Out, false);
+ CGM.getCXXABI().getMangleContext().mangleCanonicalTypeName(Ty, Out, false);
return llvm::ConstantInt::get(
CGM.Int32Ty, static_cast<uint32_t>(llvm::xxh3_64bits(Mangled)));
}
diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index 93c3f8d6efbaade..2dd756919876918 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -2006,7 +2006,7 @@ llvm::ConstantInt *CodeGenModule::CreateKCFITypeId(QualType T) {
std::string OutName;
llvm::raw_string_ostream Out(OutName);
- getCXXABI().getMangleContext().mangleTypeName(
+ getCXXABI().getMangleContext().mangleCanonicalTypeName(
T, Out, getCodeGenOpts().SanitizeCfiICallNormalizeIntegers);
if (getCodeGenOpts().SanitizeCfiICallNormalizeIntegers)
@@ -7203,7 +7203,7 @@ CodeGenModule::CreateMetadataIdentifierImpl(QualType T, MetadataTypeMap &Map,
if (isExternallyVisible(T->getLinkage())) {
std::string OutName;
llvm::raw_string_ostream Out(OutName);
- getCXXABI().getMangleContext().mangleTypeName(
+ getCXXABI().getMangleContext().mangleCanonicalTypeName(
T, Out, getCodeGenOpts().SanitizeCfiICallNormalizeIntegers);
if (getCodeGenOpts().SanitizeCfiICallNormalizeIntegers)
diff --git a/clang/lib/CodeGen/CodeGenTBAA.cpp b/clang/lib/CodeGen/CodeGenTBAA.cpp
index 395ed7b1d703a5e..8705d3d65f1a573 100644
--- a/clang/lib/CodeGen/CodeGenTBAA.cpp
+++ b/clang/lib/CodeGen/CodeGenTBAA.cpp
@@ -205,7 +205,7 @@ llvm::MDNode *CodeGenTBAA::getTypeInfoHelper(const Type *Ty) {
SmallString<256> OutName;
llvm::raw_svector_ostream Out(OutName);
- MContext.mangleTypeName(QualType(ETy, 0), Out);
+ MContext.mangleCanonicalTypeName(QualType(ETy, 0), Out);
return createScalarTypeNode(OutName, getChar(), Size);
}
@@ -391,7 +391,7 @@ llvm::MDNode *CodeGenTBAA::getBaseTypeInfoHelper(const Type *Ty) {
if (Features.CPlusPlus) {
// Don't use the mangler for C code.
llvm::raw_svector_ostream Out(OutName);
- MContext.mangleTypeName(QualType(Ty, 0), Out);
+ MContext.mangleCanonicalTypeName(QualType(Ty, 0), Out);
} else {
OutName = RD->getName();
}
diff --git a/clang/test/CodeGen/ubsan-function-sugared.cpp b/clang/test/CodeGen/ubsan-function-sugared.cpp
index 238bf31f4aba6d1..fb2487c024ba903 100644
--- a/clang/test/CodeGen/ubsan-function-sugared.cpp
+++ b/clang/test/CodeGen/ubsan-function-sugared.cpp
@@ -40,5 +40,4 @@ void caller() {
}
// GNU: ![[FUNCSAN]] = !{i32 -1056584962, i32 905068220}
-// FIXME: Wrong hash
-// MSVC: ![[FUNCSAN]] = !{i32 -1056584962, i32 165986058}
+// MSVC: ![[FUNCSAN]] = !{i32 -1056584962, i32 -1600339357}
diff --git a/clang/unittests/AST/DeclTest.cpp b/clang/unittests/AST/DeclTest.cpp
index d2977b0cb55b64a..474d3dadb5a52c6 100644
--- a/clang/unittests/AST/DeclTest.cpp
+++ b/clang/unittests/AST/DeclTest.cpp
@@ -135,8 +135,8 @@ TEST(Decl, MangleDependentSizedArray) {
std::unique_ptr<ItaniumMangleContext> MC(
ItaniumMangleContext::create(Ctx, Diags));
- MC->mangleTypeName(DeclA->getType(), OS_A);
- MC->mangleTypeName(DeclB->getType(), OS_B);
+ MC->mangleCanonicalTypeName(DeclA->getType(), OS_A);
+ MC->mangleCanonicalTypeName(DeclB->getType(), OS_B);
ASSERT_TRUE(0 == MangleA.compare("_ZTSA_i"));
ASSERT_TRUE(0 == MangleB.compare("_ZTSAT0__T_"));
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