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//===- ValueMapper.cpp - Interface shared by lib/Transforms/Utils ---------===//
//
// 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"
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 {
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;
}
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