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