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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"
static inline const Type *checkType(const Type *Ty) {
assert(Ty && "Invalid indices for type!");
return Ty;
}
//===----------------------------------------------------------------------===//
// 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 std::vector<Value*> &Idx,
bool AllowCompositeLeaf = false) {
if (!Ptr->isPointerType()) return 0; // Type isn't a pointer type!
// Handle the special case of the empty set index set...
if (Idx.empty()) return cast<PointerType>(Ptr)->getElementType();
unsigned CurIDX = 0;
while (const CompositeType *CT = dyn_cast<CompositeType>(Ptr)) {
if (Idx.size() == CurIDX) {
if (AllowCompositeLeaf || CT->isFirstClassType()) return Ptr;
return 0; // Can't load a whole structure or array!?!?
}
Value *Index = Idx[CurIDX++];
if (!CT->indexValid(Index)) return 0;
Ptr = CT->getTypeAtIndex(Index);
}
return CurIDX == Idx.size() ? Ptr : 0;
}
//===----------------------------------------------------------------------===//
// LoadInst Implementation
//===----------------------------------------------------------------------===//
LoadInst::LoadInst(Value *Ptr, const std::vector<Value*> &Idx,
const std::string &Name = "")
: MemAccessInst(checkType(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 std::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 std::vector<Value*> &Idx,
const std::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 std::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 std::vector<Value*> &Idx,
const std::string &Name = "")
: MemAccessInst(PointerType::get(checkType(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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