1 //===- ValueMapper.cpp - Interface shared by lib/Transforms/Utils ---------===//
3 // This file defines the MapValue function, which is shared by various parts of
4 // the lib/Transforms/Utils library.
6 //===----------------------------------------------------------------------===//
8 #include "ValueMapper.h"
9 #include "llvm/Constants.h"
10 #include "llvm/Instruction.h"
12 Value *MapValue(const Value *V, std::map<const Value*, Value*> &VM) {
13 Value *&VMSlot = VM[V];
14 if (VMSlot) return VMSlot; // Does it exist in the map yet?
16 if (Constant *C = const_cast<Constant*>(dyn_cast<Constant>(V))) {
17 if (isa<ConstantIntegral>(C) || isa<ConstantFP>(C) ||
18 isa<ConstantPointerNull>(C))
19 return VMSlot = C; // Primitive constants map directly
20 else if (ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(C)) {
21 GlobalValue *MV = cast<GlobalValue>(MapValue((Value*)CPR->getValue(),VM));
22 return VMSlot = ConstantPointerRef::get(MV);
23 } else if (ConstantArray *CA = dyn_cast<ConstantArray>(C)) {
24 const std::vector<Use> &Vals = CA->getValues();
25 for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
26 Value *MV = MapValue(Vals[i], VM);
28 // This array must contain a reference to a global, make a new array
31 std::vector<Constant*> Values;
32 Values.reserve(Vals.size());
33 for (unsigned j = 0; j != i; ++j)
34 Values.push_back(cast<Constant>(Vals[j]));
35 Values.push_back(cast<Constant>(MV));
36 for (++i; i != e; ++i)
37 Values.push_back(cast<Constant>(MapValue(Vals[i], VM)));
38 return VMSlot = ConstantArray::get(CA->getType(), Values);
43 } else if (ConstantStruct *CS = dyn_cast<ConstantStruct>(C)) {
44 const std::vector<Use> &Vals = CS->getValues();
45 for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
46 Value *MV = MapValue(Vals[i], VM);
48 // This struct must contain a reference to a global, make a new struct
51 std::vector<Constant*> Values;
52 Values.reserve(Vals.size());
53 for (unsigned j = 0; j != i; ++j)
54 Values.push_back(cast<Constant>(Vals[j]));
55 Values.push_back(cast<Constant>(MV));
56 for (++i; i != e; ++i)
57 Values.push_back(cast<Constant>(MapValue(Vals[i], VM)));
58 return VMSlot = ConstantStruct::get(CS->getType(), Values);
63 } else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
64 if (CE->getOpcode() == Instruction::Cast) {
65 Constant *MV = cast<Constant>(MapValue(CE->getOperand(0), VM));
66 return VMSlot = ConstantExpr::getCast(MV, CE->getType());
67 } else if (CE->getOpcode() == Instruction::GetElementPtr) {
68 std::vector<Constant*> Idx;
69 Constant *MV = cast<Constant>(MapValue(CE->getOperand(0), VM));
70 for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i)
71 Idx.push_back(cast<Constant>(MapValue(CE->getOperand(i), VM)));
72 return VMSlot = ConstantExpr::getGetElementPtr(MV, Idx);
74 assert(CE->getNumOperands() == 2 && "Must be binary operator?");
75 Constant *MV1 = cast<Constant>(MapValue(CE->getOperand(0), VM));
76 Constant *MV2 = cast<Constant>(MapValue(CE->getOperand(1), VM));
77 return VMSlot = ConstantExpr::get(CE->getOpcode(), MV1, MV2);
81 assert(0 && "Unknown type of constant!");
86 assert(0 && "Unknown value type: why didn't it get resolved?!");