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 ValueToValueMapTy::iterator VMI = VM.find(V);
28 // Global values and non-function-local metadata do not need to be seeded into
29 // the ValueMap if they are using the identity mapping.
30 if (isa<GlobalValue>(V) || isa<InlineAsm>(V) || isa<MDString>(V) ||
31 (isa<MDNode>(V) && !cast<MDNode>(V)->isFunctionLocal()))
32 return VM[V] = const_cast<Value*>(V);
34 if (const MDNode *MD = dyn_cast<MDNode>(V)) {
35 SmallVector<Value*, 4> Elts;
36 for (unsigned i = 0, e = MD->getNumOperands(); i != e; ++i)
37 Elts.push_back(MD->getOperand(i) ? MapValue(MD->getOperand(i), VM) : 0);
38 return VM[V] = MDNode::get(V->getContext(), Elts.data(), Elts.size());
41 Constant *C = const_cast<Constant*>(dyn_cast<Constant>(V));
44 if (isa<ConstantInt>(C) || isa<ConstantFP>(C) ||
45 isa<ConstantPointerNull>(C) || isa<ConstantAggregateZero>(C) ||
46 isa<UndefValue>(C) || isa<MDString>(C))
47 return VM[V] = C; // Primitive constants map directly
49 if (ConstantArray *CA = dyn_cast<ConstantArray>(C)) {
50 for (User::op_iterator b = CA->op_begin(), i = b, e = CA->op_end();
52 Value *MV = MapValue(*i, VM);
54 // This array must contain a reference to a global, make a new array
57 std::vector<Constant*> Values;
58 Values.reserve(CA->getNumOperands());
59 for (User::op_iterator j = b; j != i; ++j)
60 Values.push_back(cast<Constant>(*j));
61 Values.push_back(cast<Constant>(MV));
62 for (++i; i != e; ++i)
63 Values.push_back(cast<Constant>(MapValue(*i, VM)));
64 return VM[V] = ConstantArray::get(CA->getType(), Values);
70 if (ConstantStruct *CS = dyn_cast<ConstantStruct>(C)) {
71 for (User::op_iterator b = CS->op_begin(), i = b, e = CS->op_end();
73 Value *MV = MapValue(*i, VM);
75 // This struct must contain a reference to a global, make a new struct
78 std::vector<Constant*> Values;
79 Values.reserve(CS->getNumOperands());
80 for (User::op_iterator j = b; j != i; ++j)
81 Values.push_back(cast<Constant>(*j));
82 Values.push_back(cast<Constant>(MV));
83 for (++i; i != e; ++i)
84 Values.push_back(cast<Constant>(MapValue(*i, VM)));
85 return VM[V] = ConstantStruct::get(CS->getType(), Values);
91 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
92 std::vector<Constant*> Ops;
93 for (User::op_iterator i = CE->op_begin(), e = CE->op_end(); i != e; ++i)
94 Ops.push_back(cast<Constant>(MapValue(*i, VM)));
95 return VM[V] = CE->getWithOperands(Ops);
98 if (ConstantVector *CV = dyn_cast<ConstantVector>(C)) {
99 for (User::op_iterator b = CV->op_begin(), i = b, e = CV->op_end();
101 Value *MV = MapValue(*i, VM);
103 // This vector value must contain a reference to a global, make a new
104 // vector constant and return it.
106 std::vector<Constant*> Values;
107 Values.reserve(CV->getNumOperands());
108 for (User::op_iterator j = b; j != i; ++j)
109 Values.push_back(cast<Constant>(*j));
110 Values.push_back(cast<Constant>(MV));
111 for (++i; i != e; ++i)
112 Values.push_back(cast<Constant>(MapValue(*i, VM)));
113 return VM[V] = ConstantVector::get(Values);
119 BlockAddress *BA = cast<BlockAddress>(C);
120 Function *F = cast<Function>(MapValue(BA->getFunction(), VM));
121 BasicBlock *BB = cast_or_null<BasicBlock>(MapValue(BA->getBasicBlock(),VM));
122 return VM[V] = BlockAddress::get(F, BB ? BB : BA->getBasicBlock());
125 /// RemapInstruction - Convert the instruction operands from referencing the
126 /// current values into those specified by ValueMap.
128 void llvm::RemapInstruction(Instruction *I, ValueToValueMapTy &ValueMap) {
129 for (User::op_iterator op = I->op_begin(), E = I->op_end(); op != E; ++op) {
130 Value *V = MapValue(*op, ValueMap);
131 assert(V && "Referenced value not in value map!");