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Expand the pass to unify all of the unwind blocks as well

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8456 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2003-09-10 20:34:51 +00:00
parent d0b52cf3e7
commit f46057be77
2 changed files with 42 additions and 17 deletions
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25
include/llvm/Transforms/Utils/UnifyFunctionExitNodes.h
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@ -1,9 +1,10 @@
//===-- UnifyFunctionExitNodes.h - Ensure fn's have one return ---*- C++ -*--=//
//===-- UnifyFunctionExitNodes.h - Ensure fn's have one return --*- C++ -*-===//
//
// This pass is used to ensure that functions have at most one return
// instruction in them. Additionally, it keeps track of which node is the new
// exit node of the CFG. If there are no exit nodes in the CFG, the getExitNode
// method will return a null pointer.
// This pass is used to ensure that functions have at most one return and one
// unwind instruction in them. Additionally, it keeps track of which node is
// the new exit node of the CFG. If there are no return or unwind instructions
// in the function, the getReturnBlock/getUnwindBlock methods will return a null
// pointer.
//
//===----------------------------------------------------------------------===//
@ -13,22 +14,22 @@
#include "llvm/Pass.h"
struct UnifyFunctionExitNodes : public FunctionPass {
BasicBlock *ExitNode;
BasicBlock *ReturnBlock, *UnwindBlock;
public:
UnifyFunctionExitNodes() : ExitNode(0) {}
UnifyFunctionExitNodes() : ReturnBlock(0), UnwindBlock(0) {}
// We can preserve non-critical-edgeness when we unify function exit nodes
virtual void getAnalysisUsage(AnalysisUsage &AU) const;
// getExitNode - Return the new single (or nonexistant) exit node of the CFG.
// getReturn|UnwindBlock - Return the new single (or nonexistant) return or
// unwind basic blocks in the CFG.
//
BasicBlock *getExitNode() const { return ExitNode; }
BasicBlock *getReturnBlock() const { return ReturnBlock; }
BasicBlock *getUnwindBlock() const { return UnwindBlock; }
virtual bool runOnFunction(Function &F);
};
static inline Pass *createUnifyFunctionExitNodesPass() {
return new UnifyFunctionExitNodes();
}
Pass *createUnifyFunctionExitNodesPass();
#endif