There is no such thing as typeinfo for a cv-qualified type. Assert

that this is true when mangling, then fix up the various places in
Sema and/or CodeGen that need to remove qualifiers. Addresses a
linking issue when building LLVM with Clang.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@92064 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/CGException.cpp

@@ -367,7 +367,9 @@ void CodeGenFunction::EmitStartEHSpec(const Decl *D) {
 
   for (unsigned i = 0; i < Proto->getNumExceptions(); ++i) {
     QualType Ty = Proto->getExceptionType(i);
-    llvm::Value *EHType = CGM.GetAddrOfRTTIDescriptor(Ty.getNonReferenceType());
+    QualType ExceptType
+      = Ty.getNonReferenceType().getUnqualifiedType();
+    llvm::Value *EHType = CGM.GetAddrOfRTTIDescriptor(ExceptType);
     SelectorArgs.push_back(EHType);
   }
   if (Proto->getNumExceptions())
@@ -506,8 +508,11 @@ void CodeGenFunction::EmitCXXTryStmt(const CXXTryStmt &S) {
     const CXXCatchStmt *C = S.getHandler(i);
     VarDecl *CatchParam = C->getExceptionDecl();
     if (CatchParam) {
+      // C++ [except.handle]p3 indicates that top-level cv-qualifiers
+      // are ignored.
+      QualType CaughtType = C->getCaughtType().getNonReferenceType();
       llvm::Value *EHTypeInfo
-        = CGM.GetAddrOfRTTIDescriptor(C->getCaughtType().getNonReferenceType());
+        = CGM.GetAddrOfRTTIDescriptor(CaughtType.getUnqualifiedType());
       SelectorArgs.push_back(EHTypeInfo);
     } else {
       // null indicates catch all

lib/CodeGen/CGExprCXX.cpp

@@ -548,8 +548,10 @@ llvm::Value *CodeGenFunction::EmitDynamicCast(llvm::Value *V,
     assert(SrcTy->isRecordType() && "Src type must be record type!");
     assert(DestTy->isRecordType() && "Dest type must be record type!");
     
-    llvm::Value *SrcArg = CGM.GetAddrOfRTTIDescriptor(SrcTy);
+    llvm::Value *SrcArg
-    llvm::Value *DestArg = CGM.GetAddrOfRTTIDescriptor(DestTy);
+      = CGM.GetAddrOfRTTIDescriptor(SrcTy.getUnqualifiedType());
+    llvm::Value *DestArg
+      = CGM.GetAddrOfRTTIDescriptor(DestTy.getUnqualifiedType());
     
     V = Builder.CreateBitCast(V, PtrToInt8Ty);
     V = Builder.CreateCall4(CGM.CreateRuntimeFunction(FTy, "__dynamic_cast"),

lib/CodeGen/Mangle.cpp

@@ -1586,6 +1586,7 @@ void MangleContext::mangleCXXCtorVtable(const CXXRecordDecl *RD, int64_t Offset,
 void MangleContext::mangleCXXRTTI(QualType Ty,
                                   llvm::SmallVectorImpl<char> &Res) {
   // <special-name> ::= TI <type>  # typeinfo structure
+  assert(!Ty.hasQualifiers() && "RTTI info cannot have top-level qualifiers");
   CXXNameMangler Mangler(*this, Res);
   Mangler.getStream() << "_ZTI";
   Mangler.mangleType(Ty);

lib/Sema/SemaExprCXX.cpp

@@ -137,8 +137,15 @@ Sema::ActOnCXXThrow(SourceLocation OpLoc, ExprArg E) {
 /// CheckCXXThrowOperand - Validate the operand of a throw.
 bool Sema::CheckCXXThrowOperand(SourceLocation ThrowLoc, Expr *&E) {
   // C++ [except.throw]p3:
-  //   [...] adjusting the type from "array of T" or "function returning T"
+  //   A throw-expression initializes a temporary object, called the exception
-  //   to "pointer to T" or "pointer to function returning T", [...]
+  //   object, the type of which is determined by removing any top-level
+  //   cv-qualifiers from the static type of the operand of throw and adjusting
+  //   the type from "array of T" or "function returning T" to "pointer to T" 
+  //   or "pointer to function returning T", [...]
+  if (E->getType().hasQualifiers())
+    ImpCastExprToType(E, E->getType().getUnqualifiedType(), CastExpr::CK_NoOp,
+                      E->isLvalue(Context) == Expr::LV_Valid);
+  
   DefaultFunctionArrayConversion(E);
 
   //   If the type of the exception would be an incomplete type or a pointer

test/CodeGenCXX/try-catch.cpp

@@ -0,0 +1,13 @@
+// RUN: %clang_cc1 %s -triple=x86_64-apple-darwin10 -emit-llvm -o - -fexceptions | FileCheck %s
+
+struct X { };
+
+const X g();
+
+void f() {
+  try {
+    throw g();
+    // CHECK: @_ZTI1X to i8
+  } catch (const X x) {
+  }
+}