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)
  19   : Instruction(Type::VoidTy, iType, "") {
  20 }
  21
  22 TerminatorInst::TerminatorInst(const Type *Ty, Instruction::TermOps iType,
  23                                const std::string &Name)
  24   : Instruction(Ty, iType, Name) {
  25 }
  26
  27
  28 //===----------------------------------------------------------------------===//
  29 //                               PHINode Class
  30 //===----------------------------------------------------------------------===//
  31
  32 PHINode::PHINode(const Type *Ty, const std::string &name)
  33   : Instruction(Ty, Instruction::PHINode, name) {
  34 }
  35
  36 PHINode::PHINode(const PHINode &PN)
  37   : Instruction(PN.getType(), Instruction::PHINode) {
  38   Operands.reserve(PN.Operands.size());
  39   for (unsigned i = 0; i < PN.Operands.size(); i+=2) {
  40     Operands.push_back(Use(PN.Operands[i], this));
  41     Operands.push_back(Use(PN.Operands[i+1], this));
  42   }
  43 }
  44
  45 void PHINode::addIncoming(Value *D, BasicBlock *BB) {
  46   assert(getType() == D->getType() &&
  47          "All operands to PHI node must be the same type as the PHI node!");
  48   Operands.push_back(Use(D, this));
  49   Operands.push_back(Use(BB, this));
  50 }
  51
  52 // removeIncomingValue - Remove an incoming value.  This is useful if a
  53 // predecessor basic block is deleted.
  54 Value *PHINode::removeIncomingValue(const BasicBlock *BB) {
  55   op_iterator Idx = find(Operands.begin(), Operands.end(), (const Value*)BB);
  56   assert(Idx != Operands.end() && "BB not in PHI node!");
  57   --Idx;  // Back up to value prior to Basic block
  58   Value *Removed = *Idx;
  59   Operands.erase(Idx, Idx+2);  // Erase Value and BasicBlock
  60   return Removed;
  61 }