| //===- ValueMapper.cpp - Interface shared by lib/Transforms/Utils ---------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file defines the MapValue function, which is shared by various parts of |
| // the lib/Transforms/Utils library. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/Transforms/Utils/ValueMapper.h" |
| #include "llvm/Type.h" |
| #include "llvm/Constants.h" |
| #include "llvm/Function.h" |
| #include "llvm/Metadata.h" |
| #include "llvm/ADT/SmallVector.h" |
| using namespace llvm; |
| |
| Value *llvm::MapValue(const Value *V, ValueToValueMapTy &VM, |
| bool ModuleLevelChanges) { |
| Value *&VMSlot = VM[V]; |
| if (VMSlot) return VMSlot; // Does it exist in the map yet? |
| |
| // NOTE: VMSlot can be invalidated by any reference to VM, which can grow the |
| // DenseMap. This includes any recursive calls to MapValue. |
| |
| // Global values do not need to be seeded into the VM if they |
| // are using the identity mapping. |
| if (isa<GlobalValue>(V) || isa<InlineAsm>(V) || isa<MDString>(V) || |
| (isa<MDNode>(V) && !cast<MDNode>(V)->isFunctionLocal() && |
| !ModuleLevelChanges)) |
| return VMSlot = const_cast<Value*>(V); |
| |
| if (const MDNode *MD = dyn_cast<MDNode>(V)) { |
| // Start by assuming that we'll use the identity mapping. |
| VMSlot = const_cast<Value*>(V); |
| |
| // Check all operands to see if any need to be remapped. |
| for (unsigned i = 0, e = MD->getNumOperands(); i != e; ++i) { |
| Value *OP = MD->getOperand(i); |
| if (!OP || MapValue(OP, VM, ModuleLevelChanges) == OP) continue; |
| |
| // Ok, at least one operand needs remapping. |
| MDNode *Dummy = MDNode::getTemporary(V->getContext(), 0, 0); |
| VM[V] = Dummy; |
| SmallVector<Value*, 4> Elts; |
| Elts.reserve(MD->getNumOperands()); |
| for (i = 0; i != e; ++i) |
| Elts.push_back(MD->getOperand(i) ? |
| MapValue(MD->getOperand(i), VM, ModuleLevelChanges) : 0); |
| MDNode *NewMD = MDNode::get(V->getContext(), Elts.data(), Elts.size()); |
| Dummy->replaceAllUsesWith(NewMD); |
| MDNode::deleteTemporary(Dummy); |
| return VM[V] = NewMD; |
| } |
| |
| // No operands needed remapping; keep the identity map. |
| return const_cast<Value*>(V); |
| } |
| |
| Constant *C = const_cast<Constant*>(dyn_cast<Constant>(V)); |
| if (C == 0) |
| return 0; |
| |
| if (isa<ConstantInt>(C) || isa<ConstantFP>(C) || |
| isa<ConstantPointerNull>(C) || isa<ConstantAggregateZero>(C) || |
| isa<UndefValue>(C)) |
| return VMSlot = C; // Primitive constants map directly |
| |
| if (ConstantArray *CA = dyn_cast<ConstantArray>(C)) { |
| for (User::op_iterator b = CA->op_begin(), i = b, e = CA->op_end(); |
| i != e; ++i) { |
| Value *MV = MapValue(*i, VM, ModuleLevelChanges); |
| if (MV != *i) { |
| // This array must contain a reference to a global, make a new array |
| // and return it. |
| // |
| std::vector<Constant*> Values; |
| Values.reserve(CA->getNumOperands()); |
| for (User::op_iterator j = b; j != i; ++j) |
| Values.push_back(cast<Constant>(*j)); |
| Values.push_back(cast<Constant>(MV)); |
| for (++i; i != e; ++i) |
| Values.push_back(cast<Constant>(MapValue(*i, VM, |
| ModuleLevelChanges))); |
| return VM[V] = ConstantArray::get(CA->getType(), Values); |
| } |
| } |
| return VM[V] = C; |
| } |
| |
| if (ConstantStruct *CS = dyn_cast<ConstantStruct>(C)) { |
| for (User::op_iterator b = CS->op_begin(), i = b, e = CS->op_end(); |
| i != e; ++i) { |
| Value *MV = MapValue(*i, VM, ModuleLevelChanges); |
| if (MV != *i) { |
| // This struct must contain a reference to a global, make a new struct |
| // and return it. |
| // |
| std::vector<Constant*> Values; |
| Values.reserve(CS->getNumOperands()); |
| for (User::op_iterator j = b; j != i; ++j) |
| Values.push_back(cast<Constant>(*j)); |
| Values.push_back(cast<Constant>(MV)); |
| for (++i; i != e; ++i) |
| Values.push_back(cast<Constant>(MapValue(*i, VM, |
| ModuleLevelChanges))); |
| return VM[V] = ConstantStruct::get(CS->getType(), Values); |
| } |
| } |
| return VM[V] = C; |
| } |
| |
| if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) { |
| std::vector<Constant*> Ops; |
| for (User::op_iterator i = CE->op_begin(), e = CE->op_end(); i != e; ++i) |
| Ops.push_back(cast<Constant>(MapValue(*i, VM, ModuleLevelChanges))); |
| return VM[V] = CE->getWithOperands(Ops); |
| } |
| |
| if (ConstantVector *CV = dyn_cast<ConstantVector>(C)) { |
| for (User::op_iterator b = CV->op_begin(), i = b, e = CV->op_end(); |
| i != e; ++i) { |
| Value *MV = MapValue(*i, VM, ModuleLevelChanges); |
| if (MV != *i) { |
| // This vector value must contain a reference to a global, make a new |
| // vector constant and return it. |
| // |
| std::vector<Constant*> Values; |
| Values.reserve(CV->getNumOperands()); |
| for (User::op_iterator j = b; j != i; ++j) |
| Values.push_back(cast<Constant>(*j)); |
| Values.push_back(cast<Constant>(MV)); |
| for (++i; i != e; ++i) |
| Values.push_back(cast<Constant>(MapValue(*i, VM, |
| ModuleLevelChanges))); |
| return VM[V] = ConstantVector::get(Values); |
| } |
| } |
| return VM[V] = C; |
| } |
| |
| BlockAddress *BA = cast<BlockAddress>(C); |
| Function *F = cast<Function>(MapValue(BA->getFunction(), VM, |
| ModuleLevelChanges)); |
| BasicBlock *BB = cast_or_null<BasicBlock>(MapValue(BA->getBasicBlock(),VM, |
| ModuleLevelChanges)); |
| return VM[V] = BlockAddress::get(F, BB ? BB : BA->getBasicBlock()); |
| } |
| |
| /// RemapInstruction - Convert the instruction operands from referencing the |
| /// current values into those specified by VMap. |
| /// |
| void llvm::RemapInstruction(Instruction *I, ValueToValueMapTy &VMap, |
| bool ModuleLevelChanges) { |
| // Remap operands. |
| for (User::op_iterator op = I->op_begin(), E = I->op_end(); op != E; ++op) { |
| Value *V = MapValue(*op, VMap, ModuleLevelChanges); |
| assert(V && "Referenced value not in value map!"); |
| *op = V; |
| } |
| |
| // Remap attached metadata. |
| SmallVector<std::pair<unsigned, MDNode *>, 4> MDs; |
| I->getAllMetadata(MDs); |
| for (SmallVectorImpl<std::pair<unsigned, MDNode *> >::iterator |
| MI = MDs.begin(), ME = MDs.end(); MI != ME; ++MI) { |
| Value *Old = MI->second; |
| Value *New = MapValue(Old, VMap, ModuleLevelChanges); |
| if (New != Old) |
| I->setMetadata(MI->first, cast<MDNode>(New)); |
| } |
| } |