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//===-- 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. It also holds onto the return instruction of the last
// unified function.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_XFORMS_UNIFY_FUNCTION_EXIT_NODES_H
#define LLVM_XFORMS_UNIFY_FUNCTION_EXIT_NODES_H
#include "llvm/Pass.h"
struct UnifyFunctionExitNodes : public FunctionPass {
BasicBlock *ExitNode;
public:
static AnalysisID ID; // Pass ID
UnifyFunctionExitNodes(AnalysisID id = ID) : ExitNode(0) { assert(ID == id); }
// UnifyAllExitNodes - Unify all exit nodes of the CFG by creating a new
// BasicBlock, and converting all returns to unconditional branches to this
// new basic block. The singular exit node is returned in ExitNode.
//
// If there are no return stmts in the function, a null pointer is returned.
//
static bool doit(Function *F, BasicBlock *&ExitNode);
virtual bool runOnFunction(Function *F) {
return doit(F, ExitNode);
}
BasicBlock *getExitNode() const { return ExitNode; }
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addProvided(ID); // Provide self!
}
};
static inline Pass *createUnifyFunctionExitNodesPass() {
return new UnifyFunctionExitNodes();
}
#endif
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