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/BasicBlock.h"
  10 #include "llvm/Function.h"
  11 #include "llvm/SymbolTable.h"
  12 #include "llvm/Type.h"
  13 #include <algorithm>  // find
  14
  15 //===----------------------------------------------------------------------===//
  16 //                            TerminatorInst Class
  17 //===----------------------------------------------------------------------===//
  18
  19 TerminatorInst::TerminatorInst(Instruction::TermOps iType)
  20   : Instruction(Type::VoidTy, iType, "") {
  21 }
  22
  23 TerminatorInst::TerminatorInst(const Type *Ty, Instruction::TermOps iType,
  24                                const std::string &Name = "")
  25   : Instruction(Ty, iType, Name) {
  26 }
  27
  28
  29 //===----------------------------------------------------------------------===//
  30 //                               PHINode Class
  31 //===----------------------------------------------------------------------===//
  32
  33 PHINode::PHINode(const Type *Ty, const std::string &name)
  34   : Instruction(Ty, Instruction::PHINode, name) {
  35 }
  36
  37 PHINode::PHINode(const PHINode &PN)
  38   : Instruction(PN.getType(), Instruction::PHINode) {
  39   Operands.reserve(PN.Operands.size());
  40   for (unsigned i = 0; i < PN.Operands.size(); i+=2) {
  41     Operands.push_back(Use(PN.Operands[i], this));
  42     Operands.push_back(Use(PN.Operands[i+1], this));
  43   }
  44 }
  45
  46 void PHINode::addIncoming(Value *D, BasicBlock *BB) {
  47   assert(getType() == D->getType() &&
  48          "All operands to PHI node must be the same type as the PHI node!");
  49   Operands.push_back(Use(D, this));
  50   Operands.push_back(Use(BB, this));
  51 }
  52
  53 // removeIncomingValue - Remove an incoming value.  This is useful if a
  54 // predecessor basic block is deleted.
  55 Value *PHINode::removeIncomingValue(const BasicBlock *BB) {
  56   op_iterator Idx = find(Operands.begin(), Operands.end(), (const Value*)BB);
  57   assert(Idx != Operands.end() && "BB not in PHI node!");
  58   --Idx;  // Back up to value prior to Basic block
  59   Value *Removed = *Idx;
  60   Operands.erase(Idx, Idx+2);  // Erase Value and BasicBlock
  61   return Removed;
  62 }