src/llvm/lib/IR/AttributeImpl.h

   1 //===-- AttributeImpl.h - Attribute Internals -------------------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 ///
  10 /// \file
  11 /// \brief This file defines various helper methods and classes used by
  12 /// LLVMContextImpl for creating and managing attributes.
  13 ///
  14 //===----------------------------------------------------------------------===//
  15
  16 #ifndef LLVM_LIB_IR_ATTRIBUTEIMPL_H
  17 #define LLVM_LIB_IR_ATTRIBUTEIMPL_H
  18
  19 #include "llvm/ADT/FoldingSet.h"
  20 #include "llvm/IR/Attributes.h"
  21 #include <string>
  22
  23 namespace llvm {
  24
  25 class Constant;
  26 class LLVMContext;
  27
  28 //===----------------------------------------------------------------------===//
  29 /// \class
  30 /// \brief This class represents a single, uniqued attribute. That attribute
  31 /// could be a single enum, a tuple, or a string.
  32 class AttributeImpl : public FoldingSetNode {
  33   unsigned char KindID; ///< Holds the AttrEntryKind of the attribute
  34
  35   // AttributesImpl is uniqued, these should not be publicly available.
  36   void operator=(const AttributeImpl &) LLVM_DELETED_FUNCTION;
  37   AttributeImpl(const AttributeImpl &) LLVM_DELETED_FUNCTION;
  38
  39 protected:
  40   enum AttrEntryKind {
  41     EnumAttrEntry,
  42     IntAttrEntry,
  43     StringAttrEntry
  44   };
  45
  46   AttributeImpl(AttrEntryKind KindID) : KindID(KindID) {}
  47
  48 public:
  49   virtual ~AttributeImpl();
  50
  51   bool isEnumAttribute() const { return KindID == EnumAttrEntry; }
  52   bool isIntAttribute() const { return KindID == IntAttrEntry; }
  53   bool isStringAttribute() const { return KindID == StringAttrEntry; }
  54
  55   bool hasAttribute(Attribute::AttrKind A) const;
  56   bool hasAttribute(StringRef Kind) const;
  57
  58   Attribute::AttrKind getKindAsEnum() const;
  59   uint64_t getValueAsInt() const;
  60
  61   StringRef getKindAsString() const;
  62   StringRef getValueAsString() const;
  63
  64   /// \brief Used when sorting the attributes.
  65   bool operator<(const AttributeImpl &AI) const;
  66
  67   void Profile(FoldingSetNodeID &ID) const {
  68     if (isEnumAttribute())
  69       Profile(ID, getKindAsEnum(), 0);
  70     else if (isIntAttribute())
  71       Profile(ID, getKindAsEnum(), getValueAsInt());
  72     else
  73       Profile(ID, getKindAsString(), getValueAsString());
  74   }
  75   static void Profile(FoldingSetNodeID &ID, Attribute::AttrKind Kind,
  76                       uint64_t Val) {
  77     ID.AddInteger(Kind);
  78     if (Val) ID.AddInteger(Val);
  79   }
  80   static void Profile(FoldingSetNodeID &ID, StringRef Kind, StringRef Values) {
  81     ID.AddString(Kind);
  82     if (!Values.empty()) ID.AddString(Values);
  83   }
  84
  85   // FIXME: Remove this!
  86   static uint64_t getAttrMask(Attribute::AttrKind Val);
  87 };
  88
  89 //===----------------------------------------------------------------------===//
  90 /// \class
  91 /// \brief A set of classes that contain the value of the
  92 /// attribute object. There are three main categories: enum attribute entries,
  93 /// represented by Attribute::AttrKind; alignment attribute entries; and string
  94 /// attribute enties, which are for target-dependent attributes.
  95
  96 class EnumAttributeImpl : public AttributeImpl {
  97   virtual void anchor();
  98   Attribute::AttrKind Kind;
  99
 100 protected:
 101   EnumAttributeImpl(AttrEntryKind ID, Attribute::AttrKind Kind)
 102       : AttributeImpl(ID), Kind(Kind) {}
 103
 104 public:
 105   EnumAttributeImpl(Attribute::AttrKind Kind)
 106       : AttributeImpl(EnumAttrEntry), Kind(Kind) {}
 107
 108   Attribute::AttrKind getEnumKind() const { return Kind; }
 109 };
 110
 111 class IntAttributeImpl : public EnumAttributeImpl {
 112   void anchor() override;
 113   uint64_t Val;
 114
 115 public:
 116   IntAttributeImpl(Attribute::AttrKind Kind, uint64_t Val)
 117       : EnumAttributeImpl(IntAttrEntry, Kind), Val(Val) {
 118     assert(
 119         (Kind == Attribute::Alignment || Kind == Attribute::StackAlignment ||
 120          Kind == Attribute::Dereferenceable) &&
 121         "Wrong kind for int attribute!");
 122   }
 123
 124   uint64_t getValue() const { return Val; }
 125 };
 126
 127 class StringAttributeImpl : public AttributeImpl {
 128   virtual void anchor();
 129   std::string Kind;
 130   std::string Val;
 131
 132 public:
 133   StringAttributeImpl(StringRef Kind, StringRef Val = StringRef())
 134       : AttributeImpl(StringAttrEntry), Kind(Kind), Val(Val) {}
 135
 136   StringRef getStringKind() const { return Kind; }
 137   StringRef getStringValue() const { return Val; }
 138 };
 139
 140 //===----------------------------------------------------------------------===//
 141 /// \class
 142 /// \brief This class represents a group of attributes that apply to one
 143 /// element: function, return type, or parameter.
 144 class AttributeSetNode : public FoldingSetNode {
 145   unsigned NumAttrs; ///< Number of attributes in this node.
 146
 147   AttributeSetNode(ArrayRef<Attribute> Attrs) : NumAttrs(Attrs.size()) {
 148     // There's memory after the node where we can store the entries in.
 149     std::copy(Attrs.begin(), Attrs.end(),
 150               reinterpret_cast<Attribute *>(this + 1));
 151   }
 152
 153   // AttributesSetNode is uniqued, these should not be publicly available.
 154   void operator=(const AttributeSetNode &) LLVM_DELETED_FUNCTION;
 155   AttributeSetNode(const AttributeSetNode &) LLVM_DELETED_FUNCTION;
 156 public:
 157   static AttributeSetNode *get(LLVMContext &C, ArrayRef<Attribute> Attrs);
 158
 159   bool hasAttribute(Attribute::AttrKind Kind) const;
 160   bool hasAttribute(StringRef Kind) const;
 161   bool hasAttributes() const { return NumAttrs != 0; }
 162
 163   Attribute getAttribute(Attribute::AttrKind Kind) const;
 164   Attribute getAttribute(StringRef Kind) const;
 165
 166   unsigned getAlignment() const;
 167   unsigned getStackAlignment() const;
 168   uint64_t getDereferenceableBytes() const;
 169   std::string getAsString(bool InAttrGrp) const;
 170
 171   typedef const Attribute *iterator;
 172   iterator begin() const { return reinterpret_cast<iterator>(this + 1); }
 173   iterator end() const { return begin() + NumAttrs; }
 174
 175   void Profile(FoldingSetNodeID &ID) const {
 176     Profile(ID, makeArrayRef(begin(), end()));
 177   }
 178   static void Profile(FoldingSetNodeID &ID, ArrayRef<Attribute> AttrList) {
 179     for (unsigned I = 0, E = AttrList.size(); I != E; ++I)
 180       AttrList[I].Profile(ID);
 181   }
 182 };
 183
 184 //===----------------------------------------------------------------------===//
 185 /// \class
 186 /// \brief This class represents a set of attributes that apply to the function,
 187 /// return type, and parameters.
 188 class AttributeSetImpl : public FoldingSetNode {
 189   friend class AttributeSet;
 190
 191   LLVMContext &Context;
 192
 193   typedef std::pair<unsigned, AttributeSetNode*> IndexAttrPair;
 194   unsigned NumAttrs; ///< Number of entries in this set.
 195
 196   /// \brief Return a pointer to the IndexAttrPair for the specified slot.
 197   const IndexAttrPair *getNode(unsigned Slot) const {
 198     return reinterpret_cast<const IndexAttrPair *>(this + 1) + Slot;
 199   }
 200
 201   // AttributesSet is uniqued, these should not be publicly available.
 202   void operator=(const AttributeSetImpl &) LLVM_DELETED_FUNCTION;
 203   AttributeSetImpl(const AttributeSetImpl &) LLVM_DELETED_FUNCTION;
 204 public:
 205   AttributeSetImpl(LLVMContext &C,
 206                    ArrayRef<std::pair<unsigned, AttributeSetNode *> > Attrs)
 207       : Context(C), NumAttrs(Attrs.size()) {
 208 #ifndef NDEBUG
 209     if (Attrs.size() >= 2) {
 210       for (const std::pair<unsigned, AttributeSetNode *> *i = Attrs.begin() + 1,
 211                                                          *e = Attrs.end();
 212            i != e; ++i) {
 213         assert((i-1)->first <= i->first && "Attribute set not ordered!");
 214       }
 215     }
 216 #endif
 217     // There's memory after the node where we can store the entries in.
 218     std::copy(Attrs.begin(), Attrs.end(),
 219               reinterpret_cast<IndexAttrPair *>(this + 1));
 220   }
 221
 222   /// \brief Get the context that created this AttributeSetImpl.
 223   LLVMContext &getContext() { return Context; }
 224
 225   /// \brief Return the number of attributes this AttributeSet contains.
 226   unsigned getNumAttributes() const { return NumAttrs; }
 227
 228   /// \brief Get the index of the given "slot" in the AttrNodes list. This index
 229   /// is the index of the return, parameter, or function object that the
 230   /// attributes are applied to, not the index into the AttrNodes list where the
 231   /// attributes reside.
 232   unsigned getSlotIndex(unsigned Slot) const {
 233     return getNode(Slot)->first;
 234   }
 235
 236   /// \brief Retrieve the attributes for the given "slot" in the AttrNode list.
 237   /// \p Slot is an index into the AttrNodes list, not the index of the return /
 238   /// parameter/ function which the attributes apply to.
 239   AttributeSet getSlotAttributes(unsigned Slot) const {
 240     return AttributeSet::get(Context, *getNode(Slot));
 241   }
 242
 243   /// \brief Retrieve the attribute set node for the given "slot" in the
 244   /// AttrNode list.
 245   AttributeSetNode *getSlotNode(unsigned Slot) const {
 246     return getNode(Slot)->second;
 247   }
 248
 249   typedef AttributeSetNode::iterator iterator;
 250   iterator begin(unsigned Slot) const { return getSlotNode(Slot)->begin(); }
 251   iterator end(unsigned Slot) const { return getSlotNode(Slot)->end(); }
 252
 253   void Profile(FoldingSetNodeID &ID) const {
 254     Profile(ID, makeArrayRef(getNode(0), getNumAttributes()));
 255   }
 256   static void Profile(FoldingSetNodeID &ID,
 257                       ArrayRef<std::pair<unsigned, AttributeSetNode*> > Nodes) {
 258     for (unsigned i = 0, e = Nodes.size(); i != e; ++i) {
 259       ID.AddInteger(Nodes[i].first);
 260       ID.AddPointer(Nodes[i].second);
 261     }
 262   }
 263
 264   // FIXME: This atrocity is temporary.
 265   uint64_t Raw(unsigned Index) const;
 266
 267   void dump() const;
 268 };
 269
 270 } // end llvm namespace
 271
 272 #endif