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(Instruction::TermOps iType)
  19   : Instruction(Type::VoidTy, iType, "") {
  20 }
  21
  22 TerminatorInst::TerminatorInst(const Type *Ty, Instruction::TermOps iType,
  23                                const string &Name = "")
  24   : Instruction(Ty, iType, Name) {
  25 }
  26
  27
  28 //===----------------------------------------------------------------------===//
  29 //                            MethodArgument Class
  30 //===----------------------------------------------------------------------===//
  31
  32 // Specialize setName to take care of symbol table majik
  33 void MethodArgument::setName(const string &name, SymbolTable *ST) {
  34   Method *P;
  35   assert((ST == 0 || (!getParent() || ST == getParent()->getSymbolTable())) &&
  36          "Invalid symtab argument!");
  37   if ((P = getParent()) && hasName()) P->getSymbolTable()->remove(this);
  38   Value::setName(name);
  39   if (P && hasName()) P->getSymbolTable()->insert(this);
  40 }
  41
  42
  43 //===----------------------------------------------------------------------===//
  44 //                               PHINode Class
  45 //===----------------------------------------------------------------------===//
  46
  47 PHINode::PHINode(const Type *Ty, const string &name)
  48   : Instruction(Ty, Instruction::PHINode, name) {
  49 }
  50
  51 PHINode::PHINode(const PHINode &PN)
  52   : Instruction(PN.getType(), Instruction::PHINode) {
  53   Operands.reserve(PN.Operands.size());
  54   for (unsigned i = 0; i < PN.Operands.size(); i+=2) {
  55     Operands.push_back(Use(PN.Operands[i], this));
  56     Operands.push_back(Use(PN.Operands[i+1], this));
  57   }
  58 }
  59
  60 void PHINode::addIncoming(Value *D, BasicBlock *BB) {
  61   Operands.push_back(Use(D, this));
  62   Operands.push_back(Use(BB, this));
  63 }
  64
  65 // removeIncomingValue - Remove an incoming value.  This is useful if a
  66 // predecessor basic block is deleted.
  67 Value *PHINode::removeIncomingValue(const BasicBlock *BB) {
  68   op_iterator Idx = find(Operands.begin(), Operands.end(), (const Value*)BB);
  69   assert(Idx != Operands.end() && "BB not in PHI node!");
  70   --Idx;  // Back up to value prior to Basic block
  71   Value *Removed = *Idx;
  72   Operands.erase(Idx, Idx+2);  // Erase Value and BasicBlock
  73   return Removed;
  74 }