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109 lines
3.9 KiB
C++
109 lines
3.9 KiB
C++
//===-- llvm/iPHINode.h - PHI instruction definition -------------*- C++ -*--=//
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//
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// This file defines the PHINode class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_IPHINODE_H
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#define LLVM_IPHINODE_H
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#include "llvm/Instruction.h"
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class BasicBlock;
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//===----------------------------------------------------------------------===//
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// PHINode Class
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//===----------------------------------------------------------------------===//
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// PHINode - The PHINode class is used to represent the magical mystical PHI
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// node, that can not exist in nature, but can be synthesized in a computer
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// scientist's overactive imagination.
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//
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class PHINode : public Instruction {
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PHINode(const PHINode &PN);
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public:
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PHINode(const Type *Ty, const std::string &Name = "",
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Instruction *InsertBefore = 0)
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: Instruction(Ty, Instruction::PHINode, Name, InsertBefore) {
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}
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virtual Instruction *clone() const { return new PHINode(*this); }
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/// getNumIncomingValues - Return the number of incoming edges the PHI node
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/// has
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unsigned getNumIncomingValues() const { return Operands.size()/2; }
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/// getIncomingValue - Return incoming value #x
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Value *getIncomingValue(unsigned i) const {
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assert(i*2 < Operands.size() && "Invalid value number!");
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return Operands[i*2];
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}
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void setIncomingValue(unsigned i, Value *V) {
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assert(i*2 < Operands.size() && "Invalid value number!");
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Operands[i*2] = V;
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}
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inline unsigned getOperandNumForIncomingValue(unsigned i) {
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return i*2;
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}
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/// getIncomingBlock - Return incoming basic block #x
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BasicBlock *getIncomingBlock(unsigned i) const {
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assert(i*2+1 < Operands.size() && "Invalid value number!");
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return (BasicBlock*)Operands[i*2+1].get();
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}
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void setIncomingBlock(unsigned i, BasicBlock *BB) {
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assert(i*2+1 < Operands.size() && "Invalid value number!");
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Operands[i*2+1] = (Value*)BB;
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}
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unsigned getOperandNumForIncomingBlock(unsigned i) {
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return i*2+1;
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}
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/// addIncoming - Add an incoming value to the end of the PHI list
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void addIncoming(Value *D, BasicBlock *BB) {
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assert(getType() == D->getType() &&
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"All operands to PHI node must be the same type as the PHI node!");
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Operands.push_back(Use(D, this));
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Operands.push_back(Use((Value*)BB, this));
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}
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/// removeIncomingValue - Remove an incoming value. This is useful if a
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/// predecessor basic block is deleted. The value removed is returned.
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///
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/// If the last incoming value for a PHI node is removed (and DeletePHIIfEmpty
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/// is true), the PHI node is destroyed and any uses of it are replaced with
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/// dummy values. The only time there should be zero incoming values to a PHI
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/// node is when the block is dead, so this strategy is sound.
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///
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Value *removeIncomingValue(unsigned Idx, bool DeletePHIIfEmpty = true);
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Value *removeIncomingValue(const BasicBlock *BB, bool DeletePHIIfEmpty =true){
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int Idx = getBasicBlockIndex(BB);
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assert(Idx >= 0 && "Invalid basic block argument to remove!");
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return removeIncomingValue(Idx, DeletePHIIfEmpty);
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}
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/// getBasicBlockIndex - Return the first index of the specified basic
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/// block in the value list for this PHI. Returns -1 if no instance.
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///
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int getBasicBlockIndex(const BasicBlock *BB) const {
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for (unsigned i = 0; i < Operands.size()/2; ++i)
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if (getIncomingBlock(i) == BB) return i;
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return -1;
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}
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Value *getIncomingValueForBlock(const BasicBlock *BB) const {
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return getIncomingValue(getBasicBlockIndex(BB));
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}
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/// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const PHINode *) { return true; }
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static inline bool classof(const Instruction *I) {
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return I->getOpcode() == Instruction::PHINode;
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}
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static inline bool classof(const Value *V) {
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return isa<Instruction>(V) && classof(cast<Instruction>(V));
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}
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};
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#endif
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