lib/VMCore/InstrTypes.cpp

   1 //===-- InstrTypes.cpp - Implement Instruction subclasses -------*- C++ -*-===//
   2 //
   3 // This file implements
   4 //
   5 //===----------------------------------------------------------------------===//
   6
   7 #include "llvm/iOther.h"
   8 #include "llvm/iPHINode.h"
   9 #include "llvm/Function.h"
  10 #include "llvm/SymbolTable.h"
  11 #include "llvm/Type.h"
  12 #include <algorithm>  // find
  13
  14 //===----------------------------------------------------------------------===//
  15 //                            TerminatorInst Class
  16 //===----------------------------------------------------------------------===//
  17
  18 TerminatorInst::TerminatorInst(Instruction::TermOps iType, Instruction *IB)
  19   : Instruction(Type::VoidTy, iType, "", IB) {
  20 }
  21
  22 //===----------------------------------------------------------------------===//
  23 //                               PHINode Class
  24 //===----------------------------------------------------------------------===//
  25
  26 PHINode::PHINode(const PHINode &PN)
  27   : Instruction(PN.getType(), Instruction::PHINode) {
  28   Operands.reserve(PN.Operands.size());
  29   for (unsigned i = 0; i < PN.Operands.size(); i+=2) {
  30     Operands.push_back(Use(PN.Operands[i], this));
  31     Operands.push_back(Use(PN.Operands[i+1], this));
  32   }
  33 }
  34
  35 void PHINode::addIncoming(Value *D, BasicBlock *BB) {
  36   assert(getType() == D->getType() &&
  37          "All operands to PHI node must be the same type as the PHI node!");
  38   Operands.push_back(Use(D, this));
  39   Operands.push_back(Use(BB, this));
  40 }
  41
  42 // removeIncomingValue - Remove an incoming value.  This is useful if a
  43 // predecessor basic block is deleted.
  44 Value *PHINode::removeIncomingValue(const BasicBlock *BB) {
  45   op_iterator Idx = find(Operands.begin(), Operands.end(), (const Value*)BB);
  46   assert(Idx != Operands.end() && "BB not in PHI node!");
  47   --Idx;  // Back up to value prior to Basic block
  48   Value *Removed = *Idx;
  49   Operands.erase(Idx, Idx+2);  // Erase Value and BasicBlock
  50   return Removed;
  51 }