forked from OSchip/llvm-project
121 lines
4.8 KiB
C++
121 lines
4.8 KiB
C++
//===- ValueMapper.cpp - Interface shared by lib/Transforms/Utils ---------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the MapValue function, which is shared by various parts of
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// the lib/Transforms/Utils library.
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//
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//===----------------------------------------------------------------------===//
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#include "ValueMapper.h"
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#include "llvm/Constants.h"
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#include "llvm/Instruction.h"
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using namespace llvm;
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Value *llvm::MapValue(const Value *V, std::map<const Value*, Value*> &VM) {
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Value *&VMSlot = VM[V];
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if (VMSlot) return VMSlot; // Does it exist in the map yet?
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// Global values do not need to be seeded into the ValueMap if they are using
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// the identity mapping.
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if (isa<GlobalValue>(V))
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return VMSlot = const_cast<Value*>(V);
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if (Constant *C = const_cast<Constant*>(dyn_cast<Constant>(V))) {
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if (isa<ConstantIntegral>(C) || isa<ConstantFP>(C) ||
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isa<ConstantPointerNull>(C) || isa<ConstantAggregateZero>(C))
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return VMSlot = C; // Primitive constants map directly
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else if (ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(C)) {
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GlobalValue *MV = cast<GlobalValue>(MapValue((Value*)CPR->getValue(),VM));
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return VMSlot = ConstantPointerRef::get(MV);
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} else if (ConstantArray *CA = dyn_cast<ConstantArray>(C)) {
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const std::vector<Use> &Vals = CA->getValues();
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for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
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Value *MV = MapValue(Vals[i], VM);
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if (MV != Vals[i]) {
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// This array must contain a reference to a global, make a new array
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// and return it.
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//
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std::vector<Constant*> Values;
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Values.reserve(Vals.size());
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for (unsigned j = 0; j != i; ++j)
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Values.push_back(cast<Constant>(Vals[j]));
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Values.push_back(cast<Constant>(MV));
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for (++i; i != e; ++i)
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Values.push_back(cast<Constant>(MapValue(Vals[i], VM)));
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return VMSlot = ConstantArray::get(CA->getType(), Values);
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}
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}
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return VMSlot = C;
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} else if (ConstantStruct *CS = dyn_cast<ConstantStruct>(C)) {
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const std::vector<Use> &Vals = CS->getValues();
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for (unsigned i = 0, e = Vals.size(); i != e; ++i) {
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Value *MV = MapValue(Vals[i], VM);
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if (MV != Vals[i]) {
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// This struct must contain a reference to a global, make a new struct
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// and return it.
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//
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std::vector<Constant*> Values;
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Values.reserve(Vals.size());
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for (unsigned j = 0; j != i; ++j)
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Values.push_back(cast<Constant>(Vals[j]));
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Values.push_back(cast<Constant>(MV));
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for (++i; i != e; ++i)
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Values.push_back(cast<Constant>(MapValue(Vals[i], VM)));
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return VMSlot = ConstantStruct::get(CS->getType(), Values);
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}
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}
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return VMSlot = C;
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} else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
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if (CE->getOpcode() == Instruction::Cast) {
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Constant *MV = cast<Constant>(MapValue(CE->getOperand(0), VM));
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return VMSlot = ConstantExpr::getCast(MV, CE->getType());
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} else if (CE->getOpcode() == Instruction::GetElementPtr) {
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std::vector<Constant*> Idx;
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Constant *MV = cast<Constant>(MapValue(CE->getOperand(0), VM));
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for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i)
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Idx.push_back(cast<Constant>(MapValue(CE->getOperand(i), VM)));
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return VMSlot = ConstantExpr::getGetElementPtr(MV, Idx);
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} else {
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assert(CE->getNumOperands() == 2 && "Must be binary operator?");
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Constant *MV1 = cast<Constant>(MapValue(CE->getOperand(0), VM));
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Constant *MV2 = cast<Constant>(MapValue(CE->getOperand(1), VM));
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return VMSlot = ConstantExpr::get(CE->getOpcode(), MV1, MV2);
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}
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} else {
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assert(0 && "Unknown type of constant!");
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}
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}
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V->dump();
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assert(0 && "Unknown value type: why didn't it get resolved?!");
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return 0;
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}
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/// RemapInstruction - Convert the instruction operands from referencing the
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/// current values into those specified by ValueMap.
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///
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void llvm::RemapInstruction(Instruction *I,
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std::map<const Value *, Value*> &ValueMap) {
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for (unsigned op = 0, E = I->getNumOperands(); op != E; ++op) {
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const Value *Op = I->getOperand(op);
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Value *V = MapValue(Op, ValueMap);
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#ifndef NDEBUG
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if (!V) {
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std::cerr << "Val = \n" << Op << "Addr = " << (void*)Op;
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std::cerr << "\nInst = " << I;
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}
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#endif
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assert(V && "Referenced value not in value map!");
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I->setOperand(op, V);
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}
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}
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