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Emit an lvalue dynamic_cast even if the result is not used. Another 

part (or possibly all) of PR7132.

llvm-svn: 103810
This commit is contained in:
Douglas Gregor 2010-05-14 21:31:02 +00:00
parent 6bca984b54
commit 1c073f47da
2 changed files with 16 additions and 2 deletions
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16
clang/lib/CodeGen/CGExprAgg.cpp
View File

@ -178,7 +178,7 @@ void AggExprEmitter::EmitFinalDestCopy(const Expr *E, LValue Src, bool Ignore) {
//===----------------------------------------------------------------------===//
void AggExprEmitter::VisitCastExpr(CastExpr *E) {
if (!DestPtr) {
if (!DestPtr && E->getCastKind() != CastExpr::CK_Dynamic) {
Visit(E->getSubExpr());
return;
}
@ -186,6 +186,20 @@ void AggExprEmitter::VisitCastExpr(CastExpr *E) {
switch (E->getCastKind()) {
default: assert(0 && "Unhandled cast kind!");
case CastExpr::CK_Dynamic: {
assert(isa<CXXDynamicCastExpr>(E) && "CK_Dynamic without a dynamic_cast?");
LValue LV = CGF.EmitCheckedLValue(E->getSubExpr());
// FIXME: Do we also need to handle property references here?
if (LV.isSimple())
CGF.EmitDynamicCast(LV.getAddress(), cast<CXXDynamicCastExpr>(E));
else
CGF.CGM.ErrorUnsupported(E, "non-simple lvalue dynamic_cast");
if (DestPtr)
CGF.CGM.ErrorUnsupported(E, "lvalue dynamic_cast with a destination");
break;
}
case CastExpr::CK_ToUnion: {
// GCC union extension
QualType PtrTy =

2
clang/test/CodeGenCXX/dynamic-cast.cpp
View File

@ -10,7 +10,7 @@ const B& f(A *a) {
// CHECK: call i8* @__dynamic_cast
// CHECK: br i1
// CHECK: invoke void @__cxa_bad_cast() noreturn
return dynamic_cast<const B&>(*a);
dynamic_cast<const B&>(*a);
} catch (std::bad_cast&) {
// CHECK: call i8* @llvm.eh.exception
// CHECK: {{call.*llvm.eh.selector.*_ZTISt8bad_cast}}