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 void PHINode::addIncoming(Value *D, BasicBlock *BB) {
37 assert(getType() == D->getType() &&
38 "All operands to PHI node must be the same type as the PHI node!");
39 Operands.push_back(Use(D, this));
40 Operands.push_back(Use(BB, this));
43 // removeIncomingValue - Remove an incoming value. This is useful if a
44 // predecessor basic block is deleted.
45 Value *PHINode::removeIncomingValue(const BasicBlock *BB,
46 bool DeletePHIIfEmpty) {
47 op_iterator Idx = find(Operands.begin(), Operands.end(), (const Value*)BB);
48 assert(Idx != Operands.end() && "BB not in PHI node!");
49 --Idx; // Back up to value prior to Basic block
50 Value *Removed = *Idx;
51 Operands.erase(Idx, Idx+2); // Erase Value and BasicBlock
53 // If the PHI node is dead, because it has zero entries, nuke it now.
54 if (getNumOperands() == 0 && DeletePHIIfEmpty) {
55 // If anyone is using this PHI, make them use a dummy value instead...
56 replaceAllUsesWith(Constant::getNullValue(getType()));
57 getParent()->getInstList().erase(this);