1 //===- ValueMapper.cpp - Interface shared by lib/Transforms/Utils ---------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the MapValue function, which is shared by various parts of
11 // the lib/Transforms/Utils library.
13 //===----------------------------------------------------------------------===//
15 #include "ValueMapper.h"
16 #include "llvm/Constants.h"
17 #include "llvm/Instruction.h"
22 Value *llvm::MapValue(const Value *V, std::map<const Value*, Value*> &VM) {
23 Value *&VMSlot = VM[V];
24 if (VMSlot) return VMSlot; // Does it exist in the map yet?
26 // Global values do not need to be seeded into the ValueMap if they are using
27 // the identity mapping.
28 if (isa<GlobalValue>(V))
29 return VMSlot = const_cast<Value*>(V);
31 if (Constant *C = const_cast<Constant*>(dyn_cast<Constant>(V))) {
32 if (isa<ConstantIntegral>(C) || isa<ConstantFP>(C) ||
33 isa<ConstantPointerNull>(C) || isa<ConstantAggregateZero>(C))
34 return VMSlot = C; // Primitive constants map directly
35 else if (ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(C)) {
36 GlobalValue *MV = cast<GlobalValue>(MapValue((Value*)CPR->getValue(),VM));
37 return VMSlot = ConstantPointerRef::get(MV);
38 } else if (ConstantArray *CA = dyn_cast<ConstantArray>(C)) {
39 const std::vector<Use> &Vals = CA->getValues();
40 for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
41 Value *MV = MapValue(Vals[i], VM);
43 // This array must contain a reference to a global, make a new array
46 std::vector<Constant*> Values;
47 Values.reserve(Vals.size());
48 for (unsigned j = 0; j != i; ++j)
49 Values.push_back(cast<Constant>(Vals[j]));
50 Values.push_back(cast<Constant>(MV));
51 for (++i; i != e; ++i)
52 Values.push_back(cast<Constant>(MapValue(Vals[i], VM)));
53 return VMSlot = ConstantArray::get(CA->getType(), Values);
58 } else if (ConstantStruct *CS = dyn_cast<ConstantStruct>(C)) {
59 const std::vector<Use> &Vals = CS->getValues();
60 for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
61 Value *MV = MapValue(Vals[i], VM);
63 // This struct must contain a reference to a global, make a new struct
66 std::vector<Constant*> Values;
67 Values.reserve(Vals.size());
68 for (unsigned j = 0; j != i; ++j)
69 Values.push_back(cast<Constant>(Vals[j]));
70 Values.push_back(cast<Constant>(MV));
71 for (++i; i != e; ++i)
72 Values.push_back(cast<Constant>(MapValue(Vals[i], VM)));
73 return VMSlot = ConstantStruct::get(CS->getType(), Values);
78 } else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
79 if (CE->getOpcode() == Instruction::Cast) {
80 Constant *MV = cast<Constant>(MapValue(CE->getOperand(0), VM));
81 return VMSlot = ConstantExpr::getCast(MV, CE->getType());
82 } else if (CE->getOpcode() == Instruction::GetElementPtr) {
83 std::vector<Constant*> Idx;
84 Constant *MV = cast<Constant>(MapValue(CE->getOperand(0), VM));
85 for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i)
86 Idx.push_back(cast<Constant>(MapValue(CE->getOperand(i), VM)));
87 return VMSlot = ConstantExpr::getGetElementPtr(MV, Idx);
89 assert(CE->getNumOperands() == 2 && "Must be binary operator?");
90 Constant *MV1 = cast<Constant>(MapValue(CE->getOperand(0), VM));
91 Constant *MV2 = cast<Constant>(MapValue(CE->getOperand(1), VM));
92 return VMSlot = ConstantExpr::get(CE->getOpcode(), MV1, MV2);
96 assert(0 && "Unknown type of constant!");
101 assert(0 && "Unknown value type: why didn't it get resolved?!");
105 /// RemapInstruction - Convert the instruction operands from referencing the
106 /// current values into those specified by ValueMap.
108 void llvm::RemapInstruction(Instruction *I,
109 std::map<const Value *, Value*> &ValueMap) {
110 for (unsigned op = 0, E = I->getNumOperands(); op != E; ++op) {
111 const Value *Op = I->getOperand(op);
112 Value *V = MapValue(Op, ValueMap);
115 std::cerr << "Val = \n" << Op << "Addr = " << (void*)Op;
116 std::cerr << "\nInst = " << I;
119 assert(V && "Referenced value not in value map!");
120 I->setOperand(op, V);