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