1 //===- ValueMapper.cpp - Interface shared by lib/Transforms/Utils ---------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // 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 "llvm/Transforms/Utils/ValueMapper.h"
16 #include "llvm/DerivedTypes.h" // For getNullValue(Type::Int32Ty)
17 #include "llvm/Constants.h"
18 #include "llvm/Function.h"
19 #include "llvm/IntrinsicInst.h"
20 #include "llvm/Metadata.h"
21 #include "llvm/ADT/SmallVector.h"
22 #include "llvm/Support/ErrorHandling.h"
25 Value *llvm::MapValue(const Value *V, ValueMapTy &VM) {
26 Value *&VMSlot = VM[V];
27 if (VMSlot) return VMSlot; // Does it exist in the map yet?
29 // NOTE: VMSlot can be invalidated by any reference to VM, which can grow the
30 // DenseMap. This includes any recursive calls to MapValue.
32 // Global values and non-function-local metadata do not need to be seeded into
33 // the ValueMap if they are using the identity mapping.
34 if (isa<GlobalValue>(V) || isa<InlineAsm>(V) || isa<MDString>(V) ||
35 (isa<MDNode>(V) && !dyn_cast<MDNode>(V)->isFunctionLocal()))
36 return VMSlot = const_cast<Value*>(V);
39 const MDNode *MD = dyn_cast<MDNode>(V);
40 SmallVector<Value*, 4> Elts;
41 for (unsigned i = 0; i != MD->getNumOperands(); i++)
42 Elts.push_back(MD->getOperand(i) ? MapValue(MD->getOperand(i), VM) : NULL);
43 return VM[V] = MDNode::get(V->getContext(), Elts.data(), Elts.size());
46 Constant *C = const_cast<Constant*>(dyn_cast<Constant>(V));
49 if (isa<ConstantInt>(C) || isa<ConstantFP>(C) ||
50 isa<ConstantPointerNull>(C) || isa<ConstantAggregateZero>(C) ||
51 isa<UndefValue>(C) || isa<MDString>(C))
52 return VMSlot = C; // Primitive constants map directly
54 if (ConstantArray *CA = dyn_cast<ConstantArray>(C)) {
55 for (User::op_iterator b = CA->op_begin(), i = b, e = CA->op_end();
57 Value *MV = MapValue(*i, VM);
59 // This array must contain a reference to a global, make a new array
62 std::vector<Constant*> Values;
63 Values.reserve(CA->getNumOperands());
64 for (User::op_iterator j = b; j != i; ++j)
65 Values.push_back(cast<Constant>(*j));
66 Values.push_back(cast<Constant>(MV));
67 for (++i; i != e; ++i)
68 Values.push_back(cast<Constant>(MapValue(*i, VM)));
69 return VM[V] = ConstantArray::get(CA->getType(), Values);
75 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(C)) {
76 for (User::op_iterator b = CS->op_begin(), i = b, e = CS->op_end();
78 Value *MV = MapValue(*i, VM);
80 // This struct must contain a reference to a global, make a new struct
83 std::vector<Constant*> Values;
84 Values.reserve(CS->getNumOperands());
85 for (User::op_iterator j = b; j != i; ++j)
86 Values.push_back(cast<Constant>(*j));
87 Values.push_back(cast<Constant>(MV));
88 for (++i; i != e; ++i)
89 Values.push_back(cast<Constant>(MapValue(*i, VM)));
90 return VM[V] = ConstantStruct::get(CS->getType(), Values);
96 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
97 std::vector<Constant*> Ops;
98 for (User::op_iterator i = CE->op_begin(), e = CE->op_end(); i != e; ++i)
99 Ops.push_back(cast<Constant>(MapValue(*i, VM)));
100 return VM[V] = CE->getWithOperands(Ops);
103 if (ConstantVector *CV = dyn_cast<ConstantVector>(C)) {
104 for (User::op_iterator b = CV->op_begin(), i = b, e = CV->op_end();
106 Value *MV = MapValue(*i, VM);
108 // This vector value must contain a reference to a global, make a new
109 // vector constant and return it.
111 std::vector<Constant*> Values;
112 Values.reserve(CV->getNumOperands());
113 for (User::op_iterator j = b; j != i; ++j)
114 Values.push_back(cast<Constant>(*j));
115 Values.push_back(cast<Constant>(MV));
116 for (++i; i != e; ++i)
117 Values.push_back(cast<Constant>(MapValue(*i, VM)));
118 return VM[V] = ConstantVector::get(Values);
124 if (BlockAddress *BA = dyn_cast<BlockAddress>(C)) {
125 Function *F = cast<Function>(MapValue(BA->getFunction(), VM));
126 BasicBlock *BB = cast_or_null<BasicBlock>(MapValue(BA->getBasicBlock(),VM));
127 return VM[V] = BlockAddress::get(F, BB ? BB : BA->getBasicBlock());
130 llvm_unreachable("Unknown type of constant!");
134 /// RemapInstruction - Convert the instruction operands from referencing the
135 /// current values into those specified by ValueMap.
137 void llvm::RemapInstruction(Instruction *I, ValueMapTy &ValueMap) {
138 for (User::op_iterator op = I->op_begin(), E = I->op_end(); op != E; ++op) {
139 Value *V = MapValue(*op, ValueMap);
140 assert(V && "Referenced value not in value map!");