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 "ValueMapper.h"
16 #include "llvm/Type.h"
17 #include "llvm/Constants.h"
18 #include "llvm/Function.h"
19 #include "llvm/Metadata.h"
20 #include "llvm/ADT/SmallVector.h"
23 Value *llvm::MapValue(const Value *V, ValueToValueMapTy &VM) {
24 Value *&VMSlot = VM[V];
25 if (VMSlot) return VMSlot; // Does it exist in the map yet?
27 // NOTE: VMSlot can be invalidated by any reference to VM, which can grow the
28 // DenseMap. This includes any recursive calls to MapValue.
30 // Global values and non-function-local metadata do not need to be seeded into
31 // the VM if they are using the identity mapping.
32 if (isa<GlobalValue>(V) || isa<InlineAsm>(V) || isa<MDString>(V) ||
33 (isa<MDNode>(V) && !cast<MDNode>(V)->isFunctionLocal()))
34 return VMSlot = const_cast<Value*>(V);
36 if (const MDNode *MD = dyn_cast<MDNode>(V)) {
37 SmallVector<Value*, 4> Elts;
38 for (unsigned i = 0, e = MD->getNumOperands(); i != e; ++i)
39 Elts.push_back(MD->getOperand(i) ? MapValue(MD->getOperand(i), VM) : 0);
40 return VM[V] = MDNode::get(V->getContext(), Elts.data(), Elts.size());
43 Constant *C = const_cast<Constant*>(dyn_cast<Constant>(V));
46 if (isa<ConstantInt>(C) || isa<ConstantFP>(C) ||
47 isa<ConstantPointerNull>(C) || isa<ConstantAggregateZero>(C) ||
49 return VMSlot = C; // Primitive constants map directly
51 if (ConstantArray *CA = dyn_cast<ConstantArray>(C)) {
52 for (User::op_iterator b = CA->op_begin(), i = b, e = CA->op_end();
54 Value *MV = MapValue(*i, VM);
56 // This array must contain a reference to a global, make a new array
59 std::vector<Constant*> Values;
60 Values.reserve(CA->getNumOperands());
61 for (User::op_iterator j = b; j != i; ++j)
62 Values.push_back(cast<Constant>(*j));
63 Values.push_back(cast<Constant>(MV));
64 for (++i; i != e; ++i)
65 Values.push_back(cast<Constant>(MapValue(*i, VM)));
66 return VM[V] = ConstantArray::get(CA->getType(), Values);
72 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(C)) {
73 for (User::op_iterator b = CS->op_begin(), i = b, e = CS->op_end();
75 Value *MV = MapValue(*i, VM);
77 // This struct must contain a reference to a global, make a new struct
80 std::vector<Constant*> Values;
81 Values.reserve(CS->getNumOperands());
82 for (User::op_iterator j = b; j != i; ++j)
83 Values.push_back(cast<Constant>(*j));
84 Values.push_back(cast<Constant>(MV));
85 for (++i; i != e; ++i)
86 Values.push_back(cast<Constant>(MapValue(*i, VM)));
87 return VM[V] = ConstantStruct::get(CS->getType(), Values);
93 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
94 std::vector<Constant*> Ops;
95 for (User::op_iterator i = CE->op_begin(), e = CE->op_end(); i != e; ++i)
96 Ops.push_back(cast<Constant>(MapValue(*i, VM)));
97 return VM[V] = CE->getWithOperands(Ops);
100 if (ConstantVector *CV = dyn_cast<ConstantVector>(C)) {
101 for (User::op_iterator b = CV->op_begin(), i = b, e = CV->op_end();
103 Value *MV = MapValue(*i, VM);
105 // This vector value must contain a reference to a global, make a new
106 // vector constant and return it.
108 std::vector<Constant*> Values;
109 Values.reserve(CV->getNumOperands());
110 for (User::op_iterator j = b; j != i; ++j)
111 Values.push_back(cast<Constant>(*j));
112 Values.push_back(cast<Constant>(MV));
113 for (++i; i != e; ++i)
114 Values.push_back(cast<Constant>(MapValue(*i, VM)));
115 return VM[V] = ConstantVector::get(Values);
121 BlockAddress *BA = cast<BlockAddress>(C);
122 Function *F = cast<Function>(MapValue(BA->getFunction(), VM));
123 BasicBlock *BB = cast_or_null<BasicBlock>(MapValue(BA->getBasicBlock(),VM));
124 return VM[V] = BlockAddress::get(F, BB ? BB : BA->getBasicBlock());
127 /// RemapInstruction - Convert the instruction operands from referencing the
128 /// current values into those specified by VMap.
130 void llvm::RemapInstruction(Instruction *I, ValueToValueMapTy &VMap) {
131 for (User::op_iterator op = I->op_begin(), E = I->op_end(); op != E; ++op) {
132 Value *V = MapValue(*op, VMap);
133 assert(V && "Referenced value not in value map!");