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//===-- iMemory.cpp - Implement Memory instructions --------------*- C++ -*--=//
//
// This file implements the various memory related classes defined in iMemory.h
//
//===----------------------------------------------------------------------===//
#include "llvm/iMemory.h"
//===----------------------------------------------------------------------===//
// MemAccessInst Implementation
//===----------------------------------------------------------------------===//
// getIndexedType - Returns the type of the element that would be loaded with
// a load instruction with the specified parameters.
//
// A null type is returned if the indices are invalid for the specified
// pointer type.
//
const Type* MemAccessInst::getIndexedType(const Type *Ptr,
const vector<Value*> &Idx,
bool AllowCompositeLeaf = false) {
if (!Ptr->isPointerType()) return 0; // Type isn't a pointer type!
// Get the type pointed to...
Ptr = cast<PointerType>(Ptr)->getElementType();
unsigned CurIDX = 0;
while (const CompositeType *ST = dyn_cast<CompositeType>(Ptr)) {
if (Idx.size() == CurIDX)
return AllowCompositeLeaf ? Ptr : 0; // Can't load a whole structure!?!?
Value *Index = Idx[CurIDX++];
if (!ST->indexValid(Index)) return 0;
Ptr = ST->getTypeAtIndex(Index);
}
return CurIDX == Idx.size() ? Ptr : 0;
}
#if 1
#include "llvm/ConstantVals.h"
const vector<Constant*> MemAccessInst::getIndicesBROKEN() const {
cerr << "MemAccessInst::getIndices() does not do what you want it to. Talk"
<< " to Chris about this. We can phase it out after the paper.\n";
vector<Constant*> RetVal;
// THIS CODE WILL FAIL IF A NON CONSTANT INDEX IS USED AS AN ARRAY INDEX
// THIS IS WHY YOU SHOULD NOT USE THIS FUNCTION ANY MORE!!!
for (unsigned i = getFirstIndexOperandNumber(); i < getNumOperands(); ++i)
RetVal.push_back(cast<Constant>(getOperand(i)));
return RetVal;
}
#endif
//===----------------------------------------------------------------------===//
// LoadInst Implementation
//===----------------------------------------------------------------------===//
LoadInst::LoadInst(Value *Ptr, const vector<Value*> &Idx,
const string &Name = "")
: MemAccessInst(getIndexedType(Ptr->getType(), Idx), Load, Name) {
assert(getIndexedType(Ptr->getType(), Idx) && "Load operands invalid!");
Operands.reserve(1+Idx.size());
Operands.push_back(Use(Ptr, this));
for (unsigned i = 0, E = Idx.size(); i != E; ++i)
Operands.push_back(Use(Idx[i], this));
}
LoadInst::LoadInst(Value *Ptr, const string &Name = "")
: MemAccessInst(cast<PointerType>(Ptr->getType())->getElementType(),
Load, Name) {
Operands.reserve(1);
Operands.push_back(Use(Ptr, this));
}
//===----------------------------------------------------------------------===//
// StoreInst Implementation
//===----------------------------------------------------------------------===//
StoreInst::StoreInst(Value *Val, Value *Ptr, const vector<Value*> &Idx,
const string &Name = "")
: MemAccessInst(Type::VoidTy, Store, Name) {
assert(getIndexedType(Ptr->getType(), Idx) && "Store operands invalid!");
Operands.reserve(2+Idx.size());
Operands.push_back(Use(Val, this));
Operands.push_back(Use(Ptr, this));
for (unsigned i = 0, E = Idx.size(); i != E; ++i)
Operands.push_back(Use(Idx[i], this));
}
StoreInst::StoreInst(Value *Val, Value *Ptr, const string &Name = "")
: MemAccessInst(Type::VoidTy, Store, Name) {
Operands.reserve(2);
Operands.push_back(Use(Val, this));
Operands.push_back(Use(Ptr, this));
}
//===----------------------------------------------------------------------===//
// GetElementPtrInst Implementation
//===----------------------------------------------------------------------===//
GetElementPtrInst::GetElementPtrInst(Value *Ptr, const vector<Value*> &Idx,
const string &Name = "")
: MemAccessInst(PointerType::get(getIndexedType(Ptr->getType(), Idx, true)),
GetElementPtr, Name) {
assert(getIndexedType(Ptr->getType(), Idx, true) && "gep operands invalid!");
Operands.reserve(1+Idx.size());
Operands.push_back(Use(Ptr, this));
for (unsigned i = 0, E = Idx.size(); i != E; ++i)
Operands.push_back(Use(Idx[i], this));
}
bool GetElementPtrInst::isStructSelector() const {
return ((PointerType*)Operands[0]->getType())->getElementType()->isStructType();
}
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