forked from OSchip/llvm-project
90 lines
3.6 KiB
C++
90 lines
3.6 KiB
C++
//===- ValueMapper.cpp - Interface shared by lib/Transforms/Utils ---------===//
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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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Value *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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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))
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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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