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Cleanup implementation a bit + comments

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2527 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2002-05-07 18:51:44 +00:00
parent b444a1fff4
commit 96bcfc30dc
1 changed files with 7 additions and 19 deletions
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26
include/llvm/Transforms/Utils/UnifyFunctionExitNodes.h
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@ -1,8 +1,9 @@
//===-- 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.
// 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.
//
//===----------------------------------------------------------------------===//
@ -17,26 +18,13 @@ public:
static AnalysisID ID; // Pass ID
UnifyFunctionExitNodes(AnalysisID id = ID) : ExitNode(0) { assert(ID == id); }
virtual const char *getPassName() const { return "Unify Function Exit Nodes";}
// 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.
// getExitNode - Return the new single (or nonexistant) exit node of the CFG.
//
// 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!
}
virtual const char *getPassName() const { return "Unify Function Exit Nodes";}
virtual bool runOnFunction(Function *F);
virtual void getAnalysisUsage(AnalysisUsage &AU) const { AU.addProvided(ID); }
};
static inline Pass *createUnifyFunctionExitNodesPass() {