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"
20 Value *llvm::MapValue(const Value *V, std::map<const Value*, Value*> &VM) {
21 Value *&VMSlot = VM[V];
22 if (VMSlot) return VMSlot; // Does it exist in the map yet?
24 // Global values do not need to be seeded into the ValueMap if they are using
25 // the identity mapping.
26 if (isa<GlobalValue>(V))
27 return VMSlot = const_cast<Value*>(V);
29 if (Constant *C = const_cast<Constant*>(dyn_cast<Constant>(V))) {
30 if (isa<ConstantIntegral>(C) || isa<ConstantFP>(C) ||
31 isa<ConstantPointerNull>(C))
32 return VMSlot = C; // Primitive constants map directly
33 else if (ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(C)) {
34 GlobalValue *MV = cast<GlobalValue>(MapValue((Value*)CPR->getValue(),VM));
35 return VMSlot = ConstantPointerRef::get(MV);
36 } else if (ConstantArray *CA = dyn_cast<ConstantArray>(C)) {
37 const std::vector<Use> &Vals = CA->getValues();
38 for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
39 Value *MV = MapValue(Vals[i], VM);
41 // This array must contain a reference to a global, make a new array
44 std::vector<Constant*> Values;
45 Values.reserve(Vals.size());
46 for (unsigned j = 0; j != i; ++j)
47 Values.push_back(cast<Constant>(Vals[j]));
48 Values.push_back(cast<Constant>(MV));
49 for (++i; i != e; ++i)
50 Values.push_back(cast<Constant>(MapValue(Vals[i], VM)));
51 return VMSlot = ConstantArray::get(CA->getType(), Values);
56 } else if (ConstantStruct *CS = dyn_cast<ConstantStruct>(C)) {
57 const std::vector<Use> &Vals = CS->getValues();
58 for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
59 Value *MV = MapValue(Vals[i], VM);
61 // This struct must contain a reference to a global, make a new struct
64 std::vector<Constant*> Values;
65 Values.reserve(Vals.size());
66 for (unsigned j = 0; j != i; ++j)
67 Values.push_back(cast<Constant>(Vals[j]));
68 Values.push_back(cast<Constant>(MV));
69 for (++i; i != e; ++i)
70 Values.push_back(cast<Constant>(MapValue(Vals[i], VM)));
71 return VMSlot = ConstantStruct::get(CS->getType(), Values);
76 } else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
77 if (CE->getOpcode() == Instruction::Cast) {
78 Constant *MV = cast<Constant>(MapValue(CE->getOperand(0), VM));
79 return VMSlot = ConstantExpr::getCast(MV, CE->getType());
80 } else if (CE->getOpcode() == Instruction::GetElementPtr) {
81 std::vector<Constant*> Idx;
82 Constant *MV = cast<Constant>(MapValue(CE->getOperand(0), VM));
83 for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i)
84 Idx.push_back(cast<Constant>(MapValue(CE->getOperand(i), VM)));
85 return VMSlot = ConstantExpr::getGetElementPtr(MV, Idx);
87 assert(CE->getNumOperands() == 2 && "Must be binary operator?");
88 Constant *MV1 = cast<Constant>(MapValue(CE->getOperand(0), VM));
89 Constant *MV2 = cast<Constant>(MapValue(CE->getOperand(1), VM));
90 return VMSlot = ConstantExpr::get(CE->getOpcode(), MV1, MV2);
94 assert(0 && "Unknown type of constant!");
99 assert(0 && "Unknown value type: why didn't it get resolved?!");