Add CodeGen support for indirect goto.

 - Follows emission scheme used by llvm-gcc, i.e. invent an id for
   each label whose address is taken and replace each indirect goto by
   a switch to each possible target.
 - Currently we emit a switch for each indirect goto instead of
   merging them as llvm-gcc does.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@54318 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/CodeGen/CGExprScalar.cpp b/lib/CodeGen/CGExprScalar.cpp
index c44af4b8f1..e8adc59e9f 100644
--- a/lib/CodeGen/CGExprScalar.cpp
+++ b/lib/CodeGen/CGExprScalar.cpp
@@ -117,6 +117,12 @@ public:
   Value *VisitSizeOfAlignOfTypeExpr(const SizeOfAlignOfTypeExpr *E) {
     return EmitSizeAlignOf(E->getArgumentType(), E->getType(), E->isSizeOf());
   }
+  Value *VisitAddrLabelExpr(const AddrLabelExpr *E) {
+    Value *V = llvm::ConstantInt::get(llvm::Type::Int32Ty,
+                                      CGF.GetIDForAddrOfLabel(E->getLabel()));
+    return Builder.CreateIntToPtr(V, 
+                                  llvm::PointerType::getUnqual(llvm::Type::Int8Ty));
+  }
     
   // l-values.
   Value *VisitDeclRefExpr(DeclRefExpr *E) {