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//===-- UnifyFunctionExitNodes.h - Ensure fn's have one return --*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// 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.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TRANSFORMS_UNIFYFUNCTIONEXITNODES_H
#define LLVM_TRANSFORMS_UNIFYFUNCTIONEXITNODES_H
#include "llvm/Pass.h"
namespace llvm {
struct UnifyFunctionExitNodes : public FunctionPass {
BasicBlock *ReturnBlock, *UnwindBlock, *UnreachableBlock;
public:
static const char ID; // Pass identifcation, replacement for typeid
UnifyFunctionExitNodes() : FunctionPass((intptr_t)&ID),
ReturnBlock(0), UnwindBlock(0) {}
// We can preserve non-critical-edgeness when we unify function exit nodes
virtual void getAnalysisUsage(AnalysisUsage &AU) const;
// 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);
// Force linking the impl of this class into anything that uses this header.
static int stub;
};
Pass *createUnifyFunctionExitNodesPass();
static IncludeFile
UNIFY_FUNCTION_EXIT_NODES_INCLUDE_FILE(&UnifyFunctionExitNodes::stub);
} // End llvm namespace
#endif
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