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//===-- InstrTypes.cpp - Implement Instruction subclasses -------*- C++ -*-===//
//
// This file implements
//
//===----------------------------------------------------------------------===//
#include "llvm/iOther.h"
#include "llvm/iPHINode.h"
#include "llvm/Function.h"
#include "llvm/SymbolTable.h"
#include "llvm/Constant.h"
#include "llvm/Type.h"
#include <algorithm> // find
//===----------------------------------------------------------------------===//
// TerminatorInst Class
//===----------------------------------------------------------------------===//
TerminatorInst::TerminatorInst(Instruction::TermOps iType, Instruction *IB)
: Instruction(Type::VoidTy, iType, "", IB) {
}
//===----------------------------------------------------------------------===//
// PHINode Class
//===----------------------------------------------------------------------===//
PHINode::PHINode(const PHINode &PN)
: Instruction(PN.getType(), Instruction::PHINode) {
Operands.reserve(PN.Operands.size());
for (unsigned i = 0; i < PN.Operands.size(); i+=2) {
Operands.push_back(Use(PN.Operands[i], this));
Operands.push_back(Use(PN.Operands[i+1], this));
}
}
void PHINode::addIncoming(Value *D, BasicBlock *BB) {
assert(getType() == D->getType() &&
"All operands to PHI node must be the same type as the PHI node!");
Operands.push_back(Use(D, this));
Operands.push_back(Use(BB, this));
}
// removeIncomingValue - Remove an incoming value. This is useful if a
// predecessor basic block is deleted.
Value *PHINode::removeIncomingValue(const BasicBlock *BB,
bool DeletePHIIfEmpty) {
op_iterator Idx = find(Operands.begin(), Operands.end(), (const Value*)BB);
assert(Idx != Operands.end() && "BB not in PHI node!");
--Idx; // Back up to value prior to Basic block
Value *Removed = *Idx;
Operands.erase(Idx, Idx+2); // Erase Value and BasicBlock
// If the PHI node is dead, because it has zero entries, nuke it now.
if (getNumOperands() == 0 && DeletePHIIfEmpty) {
// If anyone is using this PHI, make them use a dummy value instead...
replaceAllUsesWith(Constant::getNullValue(getType()));
getParent()->getInstList().erase(this);
}
return Removed;
}
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