| //===- 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/GlobalValue.h" |
| #include "llvm/Instruction.h" |
| #include <iostream> |
| |
| using namespace llvm; |
| |
| Value *llvm::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) || isa<ConstantAggregateZero>(C)) |
| return VMSlot = C; // Primitive constants map directly |
| else if (ConstantArray *CA = dyn_cast<ConstantArray>(C)) { |
| for (unsigned i = 0, e = CA->getNumOperands(); i != e; ++i) { |
| Value *MV = MapValue(CA->getOperand(i), VM); |
| if (MV != CA->getOperand(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 (unsigned j = 0; j != i; ++j) |
| Values.push_back(CA->getOperand(j)); |
| Values.push_back(cast<Constant>(MV)); |
| for (++i; i != e; ++i) |
| Values.push_back(cast<Constant>(MapValue(CA->getOperand(i), VM))); |
| return VMSlot = ConstantArray::get(CA->getType(), Values); |
| } |
| } |
| return VMSlot = C; |
| |
| } else if (ConstantStruct *CS = dyn_cast<ConstantStruct>(C)) { |
| for (unsigned i = 0, e = CS->getNumOperands(); i != e; ++i) { |
| Value *MV = MapValue(CS->getOperand(i), VM); |
| if (MV != CS->getOperand(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 (unsigned j = 0; j != i; ++j) |
| Values.push_back(CS->getOperand(j)); |
| Values.push_back(cast<Constant>(MV)); |
| for (++i; i != e; ++i) |
| Values.push_back(cast<Constant>(MapValue(CS->getOperand(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::Select) { |
| Constant *MV1 = cast<Constant>(MapValue(CE->getOperand(0), VM)); |
| Constant *MV2 = cast<Constant>(MapValue(CE->getOperand(1), VM)); |
| Constant *MV3 = cast<Constant>(MapValue(CE->getOperand(2), VM)); |
| return VMSlot = ConstantExpr::getSelect(MV1, MV2, MV3); |
| } 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; |
| } |
| |
| /// RemapInstruction - Convert the instruction operands from referencing the |
| /// current values into those specified by ValueMap. |
| /// |
| void llvm::RemapInstruction(Instruction *I, |
| std::map<const Value *, Value*> &ValueMap) { |
| for (unsigned op = 0, E = I->getNumOperands(); op != E; ++op) { |
| const Value *Op = I->getOperand(op); |
| Value *V = MapValue(Op, ValueMap); |
| #ifndef NDEBUG |
| if (!V) { |
| std::cerr << "Val = \n" << *Op << "Addr = " << (void*)Op; |
| std::cerr << "\nInst = " << *I; |
| } |
| #endif |
| assert(V && "Referenced value not in value map!"); |
| I->setOperand(op, V); |
| } |
| } |