| //===- ValueMapper.cpp - Interface shared by lib/Transforms/Utils ---------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file was developed by the LLVM research group and 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 "ValueMapper.h" |
| #include "llvm/Constants.h" |
| #include "llvm/Instruction.h" |
| |
| namespace llvm { |
| |
| Value *MapValue(const Value *V, std::map<const Value*, Value*> &VM) { |
| Value *&VMSlot = VM[V]; |
| if (VMSlot) return VMSlot; // Does it exist in the map yet? |
| |
| // Global values do not need to be seeded into the ValueMap if they are using |
| // the identity mapping. |
| if (isa<GlobalValue>(V)) |
| return VMSlot = const_cast<Value*>(V); |
| |
| if (Constant *C = const_cast<Constant*>(dyn_cast<Constant>(V))) { |
| if (isa<ConstantIntegral>(C) || isa<ConstantFP>(C) || |
| isa<ConstantPointerNull>(C)) |
| return VMSlot = C; // Primitive constants map directly |
| else if (ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(C)) { |
| GlobalValue *MV = cast<GlobalValue>(MapValue((Value*)CPR->getValue(),VM)); |
| return VMSlot = ConstantPointerRef::get(MV); |
| } else if (ConstantArray *CA = dyn_cast<ConstantArray>(C)) { |
| const std::vector<Use> &Vals = CA->getValues(); |
| for (unsigned i = 0, e = Vals.size(); i != e; ++i) { |
| Value *MV = MapValue(Vals[i], VM); |
| if (MV != Vals[i]) { |
| // This array must contain a reference to a global, make a new array |
| // and return it. |
| // |
| std::vector<Constant*> Values; |
| Values.reserve(Vals.size()); |
| for (unsigned j = 0; j != i; ++j) |
| Values.push_back(cast<Constant>(Vals[j])); |
| Values.push_back(cast<Constant>(MV)); |
| for (++i; i != e; ++i) |
| Values.push_back(cast<Constant>(MapValue(Vals[i], VM))); |
| return VMSlot = ConstantArray::get(CA->getType(), Values); |
| } |
| } |
| return VMSlot = C; |
| |
| } else if (ConstantStruct *CS = dyn_cast<ConstantStruct>(C)) { |
| const std::vector<Use> &Vals = CS->getValues(); |
| for (unsigned i = 0, e = Vals.size(); i != e; ++i) { |
| Value *MV = MapValue(Vals[i], VM); |
| if (MV != Vals[i]) { |
| // This struct must contain a reference to a global, make a new struct |
| // and return it. |
| // |
| std::vector<Constant*> Values; |
| Values.reserve(Vals.size()); |
| for (unsigned j = 0; j != i; ++j) |
| Values.push_back(cast<Constant>(Vals[j])); |
| Values.push_back(cast<Constant>(MV)); |
| for (++i; i != e; ++i) |
| Values.push_back(cast<Constant>(MapValue(Vals[i], VM))); |
| return VMSlot = ConstantStruct::get(CS->getType(), Values); |
| } |
| } |
| return VMSlot = C; |
| |
| } else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) { |
| if (CE->getOpcode() == Instruction::Cast) { |
| Constant *MV = cast<Constant>(MapValue(CE->getOperand(0), VM)); |
| return VMSlot = ConstantExpr::getCast(MV, CE->getType()); |
| } else if (CE->getOpcode() == Instruction::GetElementPtr) { |
| std::vector<Constant*> Idx; |
| Constant *MV = cast<Constant>(MapValue(CE->getOperand(0), VM)); |
| for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i) |
| Idx.push_back(cast<Constant>(MapValue(CE->getOperand(i), VM))); |
| return VMSlot = ConstantExpr::getGetElementPtr(MV, Idx); |
| } else if (CE->getOpcode() == Instruction::Shl || |
| CE->getOpcode() == Instruction::Shr) { |
| assert(CE->getNumOperands() == 2 && "Must be a shift!"); |
| Constant *MV1 = cast<Constant>(MapValue(CE->getOperand(0), VM)); |
| Constant *MV2 = cast<Constant>(MapValue(CE->getOperand(1), VM)); |
| return VMSlot = ConstantExpr::getShift(CE->getOpcode(), MV1, MV2); |
| } else { |
| assert(CE->getNumOperands() == 2 && "Must be binary operator?"); |
| Constant *MV1 = cast<Constant>(MapValue(CE->getOperand(0), VM)); |
| Constant *MV2 = cast<Constant>(MapValue(CE->getOperand(1), VM)); |
| return VMSlot = ConstantExpr::get(CE->getOpcode(), MV1, MV2); |
| } |
| |
| } else { |
| assert(0 && "Unknown type of constant!"); |
| } |
| } |
| |
| V->dump(); |
| assert(0 && "Unknown value type: why didn't it get resolved?!"); |
| return 0; |
| } |
| |
| } // End llvm namespace |