lib/VMCore/iMemory.cpp

   1 //===-- iMemory.cpp - Implement Memory instructions --------------*- C++ -*--=//
   2 //
   3 // This file implements the various memory related classes defined in iMemory.h
   4 //
   5 //===----------------------------------------------------------------------===//
   6
   7 #include "llvm/iMemory.h"
   8 #include "llvm/ConstantVals.h"
   9
  10 static inline const Type *checkType(const Type *Ty) {
  11   assert(Ty && "Invalid indices for type!");
  12   return Ty;
  13 }
  14
  15 AllocationInst::AllocationInst(const Type *Ty, Value *ArraySize, unsigned iTy,
  16                                const std::string &Name = "")
  17   : Instruction(Ty, iTy, Name) {
  18   assert(Ty->isPointerType() && "Can't allocate a non pointer type!");
  19
  20   // ArraySize defaults to 1.
  21   if (!ArraySize) ArraySize = ConstantUInt::get(Type::UIntTy, 1);
  22
  23   Operands.reserve(1);
  24   assert(ArraySize->getType() == Type::UIntTy &&
  25          "Malloc/Allocation array size != UIntTy!");
  26
  27   Operands.push_back(Use(ArraySize, this));
  28 }
  29
  30 bool AllocationInst::isArrayAllocation() const {
  31   return getNumOperands() == 1 &&
  32          getOperand(0) != ConstantUInt::get(Type::UIntTy, 1);
  33 }
  34
  35 //===----------------------------------------------------------------------===//
  36 //                        MemAccessInst Implementation
  37 //===----------------------------------------------------------------------===//
  38
  39 // getIndexedType - Returns the type of the element that would be loaded with
  40 // a load instruction with the specified parameters.
  41 //
  42 // A null type is returned if the indices are invalid for the specified
  43 // pointer type.
  44 //
  45 const Type* MemAccessInst::getIndexedType(const Type *Ptr,
  46                                           const std::vector<Value*> &Idx,
  47                                           bool AllowCompositeLeaf = false) {
  48   if (!Ptr->isPointerType()) return 0;   // Type isn't a pointer type!
  49
  50   // Handle the special case of the empty set index set...
  51   if (Idx.empty()) return cast<PointerType>(Ptr)->getElementType();
  52
  53   unsigned CurIDX = 0;
  54   while (const CompositeType *CT = dyn_cast<CompositeType>(Ptr)) {
  55     if (Idx.size() == CurIDX) {
  56       if (AllowCompositeLeaf || CT->isFirstClassType()) return Ptr;
  57       return 0;   // Can't load a whole structure or array!?!?
  58     }
  59
  60     Value *Index = Idx[CurIDX++];
  61     if (!CT->indexValid(Index)) return 0;
  62     Ptr = CT->getTypeAtIndex(Index);
  63   }
  64   return CurIDX == Idx.size() ? Ptr : 0;
  65 }
  66
  67
  68 //===----------------------------------------------------------------------===//
  69 //                           LoadInst Implementation
  70 //===----------------------------------------------------------------------===//
  71
  72 LoadInst::LoadInst(Value *Ptr, const std::vector<Value*> &Idx,
  73                    const std::string &Name = "")
  74   : MemAccessInst(checkType(getIndexedType(Ptr->getType(), Idx)), Load, Name) {
  75   assert(getIndexedType(Ptr->getType(), Idx) && "Load operands invalid!");
  76   Operands.reserve(1+Idx.size());
  77   Operands.push_back(Use(Ptr, this));
  78
  79   for (unsigned i = 0, E = Idx.size(); i != E; ++i)
  80     Operands.push_back(Use(Idx[i], this));
  81
  82 }
  83
  84 LoadInst::LoadInst(Value *Ptr, const std::string &Name = "")
  85   : MemAccessInst(cast<PointerType>(Ptr->getType())->getElementType(),
  86                   Load, Name) {
  87   Operands.reserve(1);
  88   Operands.push_back(Use(Ptr, this));
  89 }
  90
  91
  92 //===----------------------------------------------------------------------===//
  93 //                           StoreInst Implementation
  94 //===----------------------------------------------------------------------===//
  95
  96 StoreInst::StoreInst(Value *Val, Value *Ptr, const std::vector<Value*> &Idx)
  97   : MemAccessInst(Type::VoidTy, Store, "") {
  98   assert(getIndexedType(Ptr->getType(), Idx) && "Store operands invalid!");
  99
 100   Operands.reserve(2+Idx.size());
 101   Operands.push_back(Use(Val, this));
 102   Operands.push_back(Use(Ptr, this));
 103
 104   for (unsigned i = 0, E = Idx.size(); i != E; ++i)
 105     Operands.push_back(Use(Idx[i], this));
 106 }
 107
 108 StoreInst::StoreInst(Value *Val, Value *Ptr)
 109   : MemAccessInst(Type::VoidTy, Store, "") {
 110
 111   Operands.reserve(2);
 112   Operands.push_back(Use(Val, this));
 113   Operands.push_back(Use(Ptr, this));
 114 }
 115
 116
 117 //===----------------------------------------------------------------------===//
 118 //                       GetElementPtrInst Implementation
 119 //===----------------------------------------------------------------------===//
 120
 121 GetElementPtrInst::GetElementPtrInst(Value *Ptr, const std::vector<Value*> &Idx,
 122                                      const std::string &Name = "")
 123   : MemAccessInst(PointerType::get(checkType(getIndexedType(Ptr->getType(),
 124                                                             Idx, true))),
 125                   GetElementPtr, Name) {
 126   assert(getIndexedType(Ptr->getType(), Idx, true) && "gep operands invalid!");
 127   Operands.reserve(1+Idx.size());
 128   Operands.push_back(Use(Ptr, this));
 129
 130   for (unsigned i = 0, E = Idx.size(); i != E; ++i)
 131     Operands.push_back(Use(Idx[i], this));
 132 }