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incoming value is removed! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4078 91177308-0d34-0410-b5e6-96231b3b80d8
61 lines
2.3 KiB
C++
61 lines
2.3 KiB
C++
//===-- InstrTypes.cpp - Implement Instruction subclasses -------*- C++ -*-===//
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//
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// This file implements
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/iOther.h"
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#include "llvm/iPHINode.h"
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#include "llvm/Function.h"
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#include "llvm/SymbolTable.h"
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#include "llvm/Constant.h"
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#include "llvm/Type.h"
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#include <algorithm> // find
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//===----------------------------------------------------------------------===//
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// TerminatorInst Class
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//===----------------------------------------------------------------------===//
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TerminatorInst::TerminatorInst(Instruction::TermOps iType, Instruction *IB)
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: Instruction(Type::VoidTy, iType, "", IB) {
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}
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//===----------------------------------------------------------------------===//
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// PHINode Class
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//===----------------------------------------------------------------------===//
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PHINode::PHINode(const PHINode &PN)
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: Instruction(PN.getType(), Instruction::PHINode) {
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Operands.reserve(PN.Operands.size());
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for (unsigned i = 0; i < PN.Operands.size(); i+=2) {
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Operands.push_back(Use(PN.Operands[i], this));
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Operands.push_back(Use(PN.Operands[i+1], this));
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}
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}
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void PHINode::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(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.
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Value *PHINode::removeIncomingValue(const BasicBlock *BB,
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bool DeletePHIIfEmpty) {
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op_iterator Idx = find(Operands.begin(), Operands.end(), (const Value*)BB);
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assert(Idx != Operands.end() && "BB not in PHI node!");
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--Idx; // Back up to value prior to Basic block
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Value *Removed = *Idx;
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Operands.erase(Idx, Idx+2); // Erase Value and BasicBlock
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// If the PHI node is dead, because it has zero entries, nuke it now.
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if (getNumOperands() == 0 && DeletePHIIfEmpty) {
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// If anyone is using this PHI, make them use a dummy value instead...
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replaceAllUsesWith(Constant::getNullValue(getType()));
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getParent()->getInstList().erase(this);
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}
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return Removed;
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}
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