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//===-- UnifyMethodExitNodes.h - Ensure methods have one return --*- C++ -*--=//
//
// This pass is used to ensure that methods have at most one return instruction
// in them. It also holds onto the return instruction of the last unified
// method.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_XFORMS_UNIFY_METHOD_EXIT_NODES_H
#define LLVM_XFORMS_UNIFY_METHOD_EXIT_NODES_H
#include "llvm/Pass.h"
struct UnifyMethodExitNodes : public MethodPass {
BasicBlock *ExitNode;
public:
static AnalysisID ID; // Pass ID
UnifyMethodExitNodes(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 Method, a null pointer is returned.
//
static bool doit(Method *M, BasicBlock *&ExitNode);
virtual bool runOnMethod(Method *M) {
return doit(M, ExitNode);
}
BasicBlock *getExitNode() const { return ExitNode; }
virtual void getAnalysisUsageInfo(Pass::AnalysisSet &Required,
Pass::AnalysisSet &Destroyed,
Pass::AnalysisSet &Provided) {
// FIXME: Should invalidate CFG
Provided.push_back(ID); // Provide self!
}
};
#endif
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