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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15334 91177308-0d34-0410-b5e6-96231b3b80d8
65 lines
2.3 KiB
C++
65 lines
2.3 KiB
C++
//===-- InstrTypes.cpp - Implement Instruction subclasses -------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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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/Instructions.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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using namespace llvm;
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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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TerminatorInst::TerminatorInst(Instruction::TermOps iType, BasicBlock *IAE)
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: Instruction(Type::VoidTy, iType, "", IAE) {
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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::PHI) {
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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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// 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(unsigned Idx, bool DeletePHIIfEmpty) {
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assert(Idx*2 < Operands.size() && "BB not in PHI node!");
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Value *Removed = Operands[Idx*2];
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Operands.erase(Operands.begin()+Idx*2, // Erase Value and BasicBlock
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Operands.begin()+Idx*2+2);
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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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