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132 lines
4.7 KiB
C++
132 lines
4.7 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/Constants.h"
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#include "llvm/DerivedTypes.h"
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AllocationInst::AllocationInst(const Type *Ty, Value *ArraySize, unsigned iTy,
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const std::string &Name, Instruction *InsertBef)
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: Instruction(PointerType::get(Ty), iTy, Name, InsertBef) {
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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 getOperand(0) != ConstantUInt::get(Type::UIntTy, 1);
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}
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const Type *AllocationInst::getAllocatedType() const {
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return getType()->getElementType();
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}
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AllocaInst::AllocaInst(const AllocaInst &AI)
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: AllocationInst(AI.getType()->getElementType(), (Value*)AI.getOperand(0),
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Instruction::Alloca) {
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}
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MallocInst::MallocInst(const MallocInst &MI)
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: AllocationInst(MI.getType()->getElementType(), (Value*)MI.getOperand(0),
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Instruction::Malloc) {
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}
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//===----------------------------------------------------------------------===//
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// FreeInst Implementation
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//===----------------------------------------------------------------------===//
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FreeInst::FreeInst(Value *Ptr, Instruction *InsertBefore)
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: Instruction(Type::VoidTy, Free, "", InsertBefore) {
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assert(isa<PointerType>(Ptr->getType()) && "Can't free nonpointer!");
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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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// LoadInst Implementation
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//===----------------------------------------------------------------------===//
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LoadInst::LoadInst(Value *Ptr, const std::string &Name, Instruction *InsertBef)
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: Instruction(cast<PointerType>(Ptr->getType())->getElementType(),
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Load, Name, InsertBef) {
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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, Instruction *InsertBefore)
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: Instruction(Type::VoidTy, Store, "", InsertBefore) {
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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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// checkType - Simple wrapper function to give a better assertion failure
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// message on bad indexes for a gep instruction.
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//
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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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GetElementPtrInst::GetElementPtrInst(Value *Ptr, const std::vector<Value*> &Idx,
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const std::string &Name, Instruction *InBe)
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: Instruction(PointerType::get(checkType(getIndexedType(Ptr->getType(),
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Idx, true))),
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GetElementPtr, Name, InBe) {
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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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// 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* GetElementPtrInst::getIndexedType(const Type *Ptr,
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const std::vector<Value*> &Idx,
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bool AllowCompositeLeaf) {
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if (!isa<PointerType>(Ptr)) 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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