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102 lines
3.8 KiB
C++
102 lines
3.8 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/ConstPoolVals.h"
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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 vector<ConstPoolVal*> &Idx,
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bool AllowStructLeaf = false) {
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if (!Ptr->isPointerType()) return 0; // Type isn't a pointer type!
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// Get the type pointed to...
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Ptr = ((const PointerType*)Ptr)->getValueType();
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if (Ptr->isStructType()) {
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unsigned CurIDX = 0;
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while (Ptr->isStructType()) {
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if (Idx.size() == CurIDX)
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return AllowStructLeaf ? Ptr : 0; // Can't load a whole structure!?!?
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if (Idx[CurIDX]->getType() != Type::UByteTy) return 0; // Illegal idx
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unsigned NextIdx = ((ConstPoolUInt*)Idx[CurIDX++])->getValue();
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const StructType *ST = (const StructType *)Ptr;
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Ptr = ST->getElementTypes()[NextIdx];
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}
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return Ptr;
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} else if (Ptr->isArrayType()) {
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assert(0 && "Loading from arrays not implemented yet!");
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} else {
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return (Idx.size() == 0) ? Ptr : 0; // Load directly through ptr
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}
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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 vector<ConstPoolVal*> &Idx,
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const string &Name = "")
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: MemAccessInst(getIndexedType(Ptr->getType(), Idx), Load, Idx, 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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//===----------------------------------------------------------------------===//
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// StoreInst Implementation
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//===----------------------------------------------------------------------===//
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StoreInst::StoreInst(Value *Val, Value *Ptr, const vector<ConstPoolVal*> &Idx,
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const string &Name = "")
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: MemAccessInst(Type::VoidTy, Store, Idx, 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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//===----------------------------------------------------------------------===//
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// GetElementPtrInst Implementation
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//===----------------------------------------------------------------------===//
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GetElementPtrInst::GetElementPtrInst(Value *Ptr,
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const vector<ConstPoolVal*> &Idx,
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const string &Name = "")
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: MemAccessInst(PointerType::get(getIndexedType(Ptr->getType(), Idx, true)),
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GetElementPtr, Idx, 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())->getValueType()->isStructType();
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}
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