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138 lines
4.9 KiB
C++
138 lines
4.9 KiB
C++
//===-- iMemory.cpp - Implement Memory instructions --------------*- C++ -*--=//
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//
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// This file implements the various memory related classes defined in iMemory.h
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/iMemory.h"
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#include "llvm/ConstantVals.h"
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static inline const Type *checkType(const Type *Ty) {
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assert(Ty && "Invalid indices for type!");
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return Ty;
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}
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AllocationInst::AllocationInst(const Type *Ty, Value *ArraySize, unsigned iTy,
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const std::string &Name = "")
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: Instruction(Ty, iTy, Name) {
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assert(Ty->isPointerType() && "Can't allocate a non pointer type!");
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// ArraySize defaults to 1.
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if (!ArraySize) ArraySize = ConstantUInt::get(Type::UIntTy, 1);
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Operands.reserve(1);
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assert(ArraySize->getType() == Type::UIntTy &&
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"Malloc/Allocation array size != UIntTy!");
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Operands.push_back(Use(ArraySize, this));
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}
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bool AllocationInst::isArrayAllocation() const {
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return getNumOperands() == 1 &&
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getOperand(0) != ConstantUInt::get(Type::UIntTy, 1);
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}
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//===----------------------------------------------------------------------===//
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// MemAccessInst Implementation
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//===----------------------------------------------------------------------===//
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// getIndexedType - Returns the type of the element that would be loaded with
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// a load instruction with the specified parameters.
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//
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// A null type is returned if the indices are invalid for the specified
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// pointer type.
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//
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const Type* MemAccessInst::getIndexedType(const Type *Ptr,
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const std::vector<Value*> &Idx,
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bool AllowCompositeLeaf = false) {
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if (!Ptr->isPointerType()) return 0; // Type isn't a pointer type!
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// Handle the special case of the empty set index set...
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if (Idx.empty()) return cast<PointerType>(Ptr)->getElementType();
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unsigned CurIDX = 0;
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while (const CompositeType *CT = dyn_cast<CompositeType>(Ptr)) {
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if (Idx.size() == CurIDX) {
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if (AllowCompositeLeaf || CT->isFirstClassType()) return Ptr;
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return 0; // Can't load a whole structure or array!?!?
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}
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Value *Index = Idx[CurIDX++];
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if (!CT->indexValid(Index)) return 0;
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Ptr = CT->getTypeAtIndex(Index);
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}
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return CurIDX == Idx.size() ? Ptr : 0;
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}
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//===----------------------------------------------------------------------===//
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// LoadInst Implementation
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//===----------------------------------------------------------------------===//
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LoadInst::LoadInst(Value *Ptr, const std::vector<Value*> &Idx,
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const std::string &Name = "")
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: MemAccessInst(checkType(getIndexedType(Ptr->getType(), Idx)), Load, Name) {
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assert(getIndexedType(Ptr->getType(), Idx) && "Load operands invalid!");
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Operands.reserve(1+Idx.size());
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Operands.push_back(Use(Ptr, this));
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for (unsigned i = 0, E = Idx.size(); i != E; ++i)
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Operands.push_back(Use(Idx[i], this));
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}
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LoadInst::LoadInst(Value *Ptr, const std::string &Name = "")
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: MemAccessInst(cast<PointerType>(Ptr->getType())->getElementType(),
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Load, Name) {
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Operands.reserve(1);
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Operands.push_back(Use(Ptr, this));
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}
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//===----------------------------------------------------------------------===//
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// StoreInst Implementation
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//===----------------------------------------------------------------------===//
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StoreInst::StoreInst(Value *Val, Value *Ptr, const std::vector<Value*> &Idx,
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const std::string &Name = "")
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: MemAccessInst(Type::VoidTy, Store, Name) {
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assert(getIndexedType(Ptr->getType(), Idx) && "Store operands invalid!");
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Operands.reserve(2+Idx.size());
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Operands.push_back(Use(Val, this));
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Operands.push_back(Use(Ptr, this));
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for (unsigned i = 0, E = Idx.size(); i != E; ++i)
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Operands.push_back(Use(Idx[i], this));
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}
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StoreInst::StoreInst(Value *Val, Value *Ptr, const std::string &Name = "")
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: MemAccessInst(Type::VoidTy, Store, Name) {
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Operands.reserve(2);
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Operands.push_back(Use(Val, this));
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Operands.push_back(Use(Ptr, this));
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}
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//===----------------------------------------------------------------------===//
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// GetElementPtrInst Implementation
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//===----------------------------------------------------------------------===//
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GetElementPtrInst::GetElementPtrInst(Value *Ptr, const std::vector<Value*> &Idx,
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const std::string &Name = "")
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: MemAccessInst(PointerType::get(checkType(getIndexedType(Ptr->getType(),
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Idx, true))),
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GetElementPtr, Name) {
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assert(getIndexedType(Ptr->getType(), Idx, true) && "gep operands invalid!");
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Operands.reserve(1+Idx.size());
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Operands.push_back(Use(Ptr, this));
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for (unsigned i = 0, E = Idx.size(); i != E; ++i)
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Operands.push_back(Use(Idx[i], this));
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}
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bool GetElementPtrInst::isStructSelector() const {
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return ((PointerType*)Operands[0]->getType())->getElementType()->isStructType();
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}
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