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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8456 91177308-0d34-0410-b5e6-96231b3b80d8
36 lines
1.2 KiB
C++
36 lines
1.2 KiB
C++
//===-- UnifyFunctionExitNodes.h - Ensure fn's have one return --*- C++ -*-===//
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//
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// This pass is used to ensure that functions have at most one return and one
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// unwind instruction in them. Additionally, it keeps track of which node is
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// the new exit node of the CFG. If there are no return or unwind instructions
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// in the function, the getReturnBlock/getUnwindBlock methods will return a null
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// pointer.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_UNIFYFUNCTIONEXITNODES_H
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#define LLVM_TRANSFORMS_UNIFYFUNCTIONEXITNODES_H
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#include "llvm/Pass.h"
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struct UnifyFunctionExitNodes : public FunctionPass {
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BasicBlock *ReturnBlock, *UnwindBlock;
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public:
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UnifyFunctionExitNodes() : ReturnBlock(0), UnwindBlock(0) {}
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// We can preserve non-critical-edgeness when we unify function exit nodes
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virtual void getAnalysisUsage(AnalysisUsage &AU) const;
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// getReturn|UnwindBlock - Return the new single (or nonexistant) return or
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// unwind basic blocks in the CFG.
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//
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BasicBlock *getReturnBlock() const { return ReturnBlock; }
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BasicBlock *getUnwindBlock() const { return UnwindBlock; }
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virtual bool runOnFunction(Function &F);
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};
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Pass *createUnifyFunctionExitNodesPass();
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#endif
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