Add support for the unreachable instruction

llvm-svn: 17039

2 files changed, 5 insertions, 3 deletions

diff --git a/llvm/include/llvm/Support/InstVisitor.h b/llvm/include/llvm/Support/InstVisitor.h
index c8e7cf98d05..a9b3b715065 100644
--- a/llvm/include/llvm/Support/InstVisitor.h
+++ b/llvm/include/llvm/Support/InstVisitor.h
@@ -156,6 +156,7 @@ struct InstVisitor {
   RetTy visitSwitchInst(SwitchInst &I)              { DELEGATE(TerminatorInst);}
   RetTy visitInvokeInst(InvokeInst &I)              { DELEGATE(TerminatorInst);}
   RetTy visitUnwindInst(UnwindInst &I)              { DELEGATE(TerminatorInst);}
+  RetTy visitUnreachableInst(UnreachableInst &I)    { DELEGATE(TerminatorInst);}
   RetTy visitSetCondInst(SetCondInst &I)            { DELEGATE(BinaryOperator);}
   RetTy visitMallocInst(MallocInst &I)              { DELEGATE(AllocationInst);}
   RetTy visitAllocaInst(AllocaInst &I)              { DELEGATE(AllocationInst);}
diff --git a/llvm/include/llvm/Transforms/Utils/UnifyFunctionExitNodes.h b/llvm/include/llvm/Transforms/Utils/UnifyFunctionExitNodes.h
index 590d51034bd..6202f85792e 100644
--- a/llvm/include/llvm/Transforms/Utils/UnifyFunctionExitNodes.h
+++ b/llvm/include/llvm/Transforms/Utils/UnifyFunctionExitNodes.h
@@ -23,18 +23,19 @@
 namespace llvm {
 
 struct UnifyFunctionExitNodes : public FunctionPass {
-  BasicBlock *ReturnBlock, *UnwindBlock;
+  BasicBlock *ReturnBlock, *UnwindBlock, *UnreachableBlock;
 public:
   UnifyFunctionExitNodes() : ReturnBlock(0), UnwindBlock(0) {}
 
   // We can preserve non-critical-edgeness when we unify function exit nodes
   virtual void getAnalysisUsage(AnalysisUsage &AU) const;
 
-  // getReturn|UnwindBlock - Return the new single (or nonexistant) return or
-  // unwind basic blocks in the CFG.
+  // getReturn|Unwind|UnreachableBlock - Return the new single (or nonexistant)
+  // return, unwind, or unreachable  basic blocks in the CFG.
   //
   BasicBlock *getReturnBlock() const { return ReturnBlock; }
   BasicBlock *getUnwindBlock() const { return UnwindBlock; }
+  BasicBlock *getUnreachableBlock() const { return UnreachableBlock; }
 
   virtual bool runOnFunction(Function &F);
 };