1 //===-- InstrTypes.cpp - Implement Instruction subclasses -------*- C++ -*-===//
3 // This file implements
5 //===----------------------------------------------------------------------===//
7 #include "llvm/iOther.h"
8 #include "llvm/iPHINode.h"
9 #include "llvm/Function.h"
10 #include "llvm/SymbolTable.h"
11 #include "llvm/Constant.h"
12 #include "llvm/Type.h"
13 #include <algorithm> // find
15 //===----------------------------------------------------------------------===//
16 // TerminatorInst Class
17 //===----------------------------------------------------------------------===//
19 TerminatorInst::TerminatorInst(Instruction::TermOps iType, Instruction *IB)
20 : Instruction(Type::VoidTy, iType, "", IB) {
23 //===----------------------------------------------------------------------===//
25 //===----------------------------------------------------------------------===//
27 PHINode::PHINode(const PHINode &PN)
28 : Instruction(PN.getType(), Instruction::PHINode) {
29 Operands.reserve(PN.Operands.size());
30 for (unsigned i = 0; i < PN.Operands.size(); i+=2) {
31 Operands.push_back(Use(PN.Operands[i], this));
32 Operands.push_back(Use(PN.Operands[i+1], this));
36 // removeIncomingValue - Remove an incoming value. This is useful if a
37 // predecessor basic block is deleted.
38 Value *PHINode::removeIncomingValue(unsigned Idx, bool DeletePHIIfEmpty) {
39 assert(Idx*2 < Operands.size() && "BB not in PHI node!");
40 Value *Removed = Operands[Idx*2];
41 Operands.erase(Operands.begin()+Idx*2, // Erase Value and BasicBlock
42 Operands.begin()+Idx*2+2);
44 // If the PHI node is dead, because it has zero entries, nuke it now.
45 if (getNumOperands() == 0 && DeletePHIIfEmpty) {
46 // If anyone is using this PHI, make them use a dummy value instead...
47 replaceAllUsesWith(Constant::getNullValue(getType()));
48 getParent()->getInstList().erase(this);