llvm-6502/lib/Transforms/Utils/ValueMapper.cpp
2007-11-09 12:27:04 +00:00

119 lines
4.6 KiB
C++

//===- 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 "llvm/Transforms/Utils/ValueMapper.h"
#include "llvm/Constants.h"
#include "llvm/GlobalValue.h"
#include "llvm/Instruction.h"
using namespace llvm;
Value *llvm::MapValue(const Value *V, ValueMapTy &VM) {
Value *&VMSlot = VM[V];
if (VMSlot) return VMSlot; // Does it exist in the map yet?
// NOTE: VMSlot can be invalidated by any reference to VM, which can grow the
// DenseMap. This includes any recursive calls to MapValue.
// Global values do not need to be seeded into the ValueMap if they are using
// the identity mapping.
if (isa<GlobalValue>(V) || isa<InlineAsm>(V))
return VMSlot = const_cast<Value*>(V);
if (Constant *C = const_cast<Constant*>(dyn_cast<Constant>(V))) {
if (isa<ConstantInt>(C) || isa<ConstantFP>(C) ||
isa<ConstantPointerNull>(C) || isa<ConstantAggregateZero>(C) ||
isa<UndefValue>(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 VM[V] = ConstantArray::get(CA->getType(), Values);
}
}
return VM[V] = 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 VM[V] = ConstantStruct::get(CS->getType(), Values);
}
}
return VM[V] = C;
} else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
std::vector<Constant*> Ops;
for (unsigned i = 0, e = CE->getNumOperands(); i != e; ++i)
Ops.push_back(cast<Constant>(MapValue(CE->getOperand(i), VM)));
return VM[V] = CE->getWithOperands(Ops);
} else if (ConstantVector *CP = dyn_cast<ConstantVector>(C)) {
for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i) {
Value *MV = MapValue(CP->getOperand(i), VM);
if (MV != CP->getOperand(i)) {
// This vector value must contain a reference to a global, make a new
// vector constant and return it.
//
std::vector<Constant*> Values;
Values.reserve(CP->getNumOperands());
for (unsigned j = 0; j != i; ++j)
Values.push_back(CP->getOperand(j));
Values.push_back(cast<Constant>(MV));
for (++i; i != e; ++i)
Values.push_back(cast<Constant>(MapValue(CP->getOperand(i), VM)));
return VM[V] = ConstantVector::get(Values);
}
}
return VM[V] = C;
} else {
assert(0 && "Unknown type of constant!");
}
}
return 0;
}
/// RemapInstruction - Convert the instruction operands from referencing the
/// current values into those specified by ValueMap.
///
void llvm::RemapInstruction(Instruction *I, ValueMapTy &ValueMap) {
for (unsigned op = 0, E = I->getNumOperands(); op != E; ++op) {
const Value *Op = I->getOperand(op);
Value *V = MapValue(Op, ValueMap);
assert(V && "Referenced value not in value map!");
I->setOperand(op, V);
}
}