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/BasicBlock.h"
   9 #include "llvm/Method.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(unsigned iType)
  19   : Instruction(Type::VoidTy, iType, "") {
  20 }
  21
  22
  23 //===----------------------------------------------------------------------===//
  24 //                            MethodArgument Class
  25 //===----------------------------------------------------------------------===//
  26
  27 // Specialize setName to take care of symbol table majik
  28 void MethodArgument::setName(const string &name, SymbolTable *ST) {
  29   Method *P;
  30   assert((ST == 0 || (!getParent() || ST == getParent()->getSymbolTable())) &&
  31          "Invalid symtab argument!");
  32   if ((P = getParent()) && hasName()) P->getSymbolTable()->remove(this);
  33   Value::setName(name);
  34   if (P && hasName()) P->getSymbolTable()->insert(this);
  35 }
  36
  37
  38 //===----------------------------------------------------------------------===//
  39 //                               PHINode Class
  40 //===----------------------------------------------------------------------===//
  41
  42 PHINode::PHINode(const Type *Ty, const string &name)
  43   : Instruction(Ty, Instruction::PHINode, name) {
  44 }
  45
  46 PHINode::PHINode(const PHINode &PN)
  47   : Instruction(PN.getType(), Instruction::PHINode) {
  48   Operands.reserve(PN.Operands.size());
  49   for (unsigned i = 0; i < PN.Operands.size(); i+=2) {
  50     Operands.push_back(Use(PN.Operands[i], this));
  51     Operands.push_back(Use(PN.Operands[i+1], this));
  52   }
  53 }
  54
  55 void PHINode::addIncoming(Value *D, BasicBlock *BB) {
  56   Operands.push_back(Use(D, this));
  57   Operands.push_back(Use(BB, this));
  58 }
  59
  60 // removeIncomingValue - Remove an incoming value.  This is useful if a
  61 // predecessor basic block is deleted.
  62 Value *PHINode::removeIncomingValue(const BasicBlock *BB) {
  63   op_iterator Idx = find(Operands.begin(), Operands.end(), (const Value*)BB);
  64   assert(Idx != Operands.end() && "BB not in PHI node!");
  65   --Idx;  // Back up to value prior to Basic block
  66   Value *Removed = *Idx;
  67   Operands.erase(Idx, Idx+2);  // Erase Value and BasicBlock
  68   return Removed;
  69 }