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annotate lib/IR/AttributeImpl.h @ 95:afa8332a0e37 LLVM3.8

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LLVM 3.8
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Tue, 13 Oct 2015 17:48:58 +0900
parents 60c9769439b8
children 1172e4bd9c6f
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1 //===-- AttributeImpl.h - Attribute Internals -------------------*- C++ -*-===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 ///
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10 /// \file
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11 /// \brief This file defines various helper methods and classes used by
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12 /// LLVMContextImpl for creating and managing attributes.
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13 ///
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14 //===----------------------------------------------------------------------===//
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15
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16 #ifndef LLVM_LIB_IR_ATTRIBUTEIMPL_H
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17 #define LLVM_LIB_IR_ATTRIBUTEIMPL_H
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18
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19 #include "llvm/ADT/FoldingSet.h"
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20 #include "llvm/IR/Attributes.h"
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21 #include "llvm/Support/TrailingObjects.h"
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22 #include <string>
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23
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24 namespace llvm {
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25
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26 class Constant;
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27 class LLVMContext;
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28
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29 //===----------------------------------------------------------------------===//
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30 /// \class
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31 /// \brief This class represents a single, uniqued attribute. That attribute
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32 /// could be a single enum, a tuple, or a string.
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33 class AttributeImpl : public FoldingSetNode {
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34 unsigned char KindID; ///< Holds the AttrEntryKind of the attribute
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35
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36 // AttributesImpl is uniqued, these should not be publicly available.
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37 void operator=(const AttributeImpl &) = delete;
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38 AttributeImpl(const AttributeImpl &) = delete;
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39
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40 protected:
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41 enum AttrEntryKind {
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42 EnumAttrEntry,
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43 IntAttrEntry,
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44 StringAttrEntry
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45 };
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46
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47 AttributeImpl(AttrEntryKind KindID) : KindID(KindID) {}
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48
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49 public:
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50 virtual ~AttributeImpl();
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51
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52 bool isEnumAttribute() const { return KindID == EnumAttrEntry; }
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53 bool isIntAttribute() const { return KindID == IntAttrEntry; }
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54 bool isStringAttribute() const { return KindID == StringAttrEntry; }
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55
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56 bool hasAttribute(Attribute::AttrKind A) const;
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57 bool hasAttribute(StringRef Kind) const;
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58
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59 Attribute::AttrKind getKindAsEnum() const;
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60 uint64_t getValueAsInt() const;
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61
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62 StringRef getKindAsString() const;
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63 StringRef getValueAsString() const;
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64
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65 /// \brief Used when sorting the attributes.
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66 bool operator<(const AttributeImpl &AI) const;
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67
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68 void Profile(FoldingSetNodeID &ID) const {
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69 if (isEnumAttribute())
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70 Profile(ID, getKindAsEnum(), 0);
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71 else if (isIntAttribute())
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72 Profile(ID, getKindAsEnum(), getValueAsInt());
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73 else
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74 Profile(ID, getKindAsString(), getValueAsString());
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75 }
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76 static void Profile(FoldingSetNodeID &ID, Attribute::AttrKind Kind,
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77 uint64_t Val) {
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78 ID.AddInteger(Kind);
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79 if (Val) ID.AddInteger(Val);
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80 }
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81 static void Profile(FoldingSetNodeID &ID, StringRef Kind, StringRef Values) {
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82 ID.AddString(Kind);
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83 if (!Values.empty()) ID.AddString(Values);
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84 }
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85
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86 // FIXME: Remove this!
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87 static uint64_t getAttrMask(Attribute::AttrKind Val);
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88 };
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89
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90 //===----------------------------------------------------------------------===//
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91 /// \class
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92 /// \brief A set of classes that contain the value of the
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93 /// attribute object. There are three main categories: enum attribute entries,
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94 /// represented by Attribute::AttrKind; alignment attribute entries; and string
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95 /// attribute enties, which are for target-dependent attributes.
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96
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97 class EnumAttributeImpl : public AttributeImpl {
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98 virtual void anchor();
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99 Attribute::AttrKind Kind;
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100
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101 protected:
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102 EnumAttributeImpl(AttrEntryKind ID, Attribute::AttrKind Kind)
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103 : AttributeImpl(ID), Kind(Kind) {}
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104
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105 public:
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106 EnumAttributeImpl(Attribute::AttrKind Kind)
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107 : AttributeImpl(EnumAttrEntry), Kind(Kind) {}
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108
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109 Attribute::AttrKind getEnumKind() const { return Kind; }
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110 };
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111
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112 class IntAttributeImpl : public EnumAttributeImpl {
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113 void anchor() override;
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114 uint64_t Val;
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115
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116 public:
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117 IntAttributeImpl(Attribute::AttrKind Kind, uint64_t Val)
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118 : EnumAttributeImpl(IntAttrEntry, Kind), Val(Val) {
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119 assert((Kind == Attribute::Alignment || Kind == Attribute::StackAlignment ||
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120 Kind == Attribute::Dereferenceable ||
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121 Kind == Attribute::DereferenceableOrNull) &&
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122 "Wrong kind for int attribute!");
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123 }
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124
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125 uint64_t getValue() const { return Val; }
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126 };
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127
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128 class StringAttributeImpl : public AttributeImpl {
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129 virtual void anchor();
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130 std::string Kind;
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131 std::string Val;
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132
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133 public:
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134 StringAttributeImpl(StringRef Kind, StringRef Val = StringRef())
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135 : AttributeImpl(StringAttrEntry), Kind(Kind), Val(Val) {}
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136
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137 StringRef getStringKind() const { return Kind; }
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138 StringRef getStringValue() const { return Val; }
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139 };
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140
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141 //===----------------------------------------------------------------------===//
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142 /// \class
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143 /// \brief This class represents a group of attributes that apply to one
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144 /// element: function, return type, or parameter.
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145 class AttributeSetNode final
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146 : public FoldingSetNode,
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147 private TrailingObjects<AttributeSetNode, Attribute> {
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148 friend TrailingObjects;
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149
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150 unsigned NumAttrs; ///< Number of attributes in this node.
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151
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152 AttributeSetNode(ArrayRef<Attribute> Attrs) : NumAttrs(Attrs.size()) {
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153 // There's memory after the node where we can store the entries in.
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154 std::copy(Attrs.begin(), Attrs.end(), getTrailingObjects<Attribute>());
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155 }
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156
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157 // AttributesSetNode is uniqued, these should not be publicly available.
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158 void operator=(const AttributeSetNode &) = delete;
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159 AttributeSetNode(const AttributeSetNode &) = delete;
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160 public:
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161 static AttributeSetNode *get(LLVMContext &C, ArrayRef<Attribute> Attrs);
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162
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163 bool hasAttribute(Attribute::AttrKind Kind) const;
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164 bool hasAttribute(StringRef Kind) const;
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165 bool hasAttributes() const { return NumAttrs != 0; }
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166
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167 Attribute getAttribute(Attribute::AttrKind Kind) const;
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168 Attribute getAttribute(StringRef Kind) const;
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169
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170 unsigned getAlignment() const;
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171 unsigned getStackAlignment() const;
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172 uint64_t getDereferenceableBytes() const;
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173 uint64_t getDereferenceableOrNullBytes() const;
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174 std::string getAsString(bool InAttrGrp) const;
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175
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176 typedef const Attribute *iterator;
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177 iterator begin() const { return getTrailingObjects<Attribute>(); }
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178 iterator end() const { return begin() + NumAttrs; }
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179
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180 void Profile(FoldingSetNodeID &ID) const {
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181 Profile(ID, makeArrayRef(begin(), end()));
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182 }
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183 static void Profile(FoldingSetNodeID &ID, ArrayRef<Attribute> AttrList) {
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184 for (unsigned I = 0, E = AttrList.size(); I != E; ++I)
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185 AttrList[I].Profile(ID);
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186 }
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187 };
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188
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189 typedef std::pair<unsigned, AttributeSetNode *> IndexAttrPair;
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190
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191 //===----------------------------------------------------------------------===//
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192 /// \class
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193 /// \brief This class represents a set of attributes that apply to the function,
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194 /// return type, and parameters.
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195 class AttributeSetImpl final
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196 : public FoldingSetNode,
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197 private TrailingObjects<AttributeSetImpl, IndexAttrPair> {
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198 friend class AttributeSet;
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199 friend TrailingObjects;
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200
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201 private:
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202 LLVMContext &Context;
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203 unsigned NumAttrs; ///< Number of entries in this set.
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204
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205 // Helper fn for TrailingObjects class.
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206 size_t numTrailingObjects(OverloadToken<IndexAttrPair>) { return NumAttrs; }
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207
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208 /// \brief Return a pointer to the IndexAttrPair for the specified slot.
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209 const IndexAttrPair *getNode(unsigned Slot) const {
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210 return getTrailingObjects<IndexAttrPair>() + Slot;
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211 }
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212
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213 // AttributesSet is uniqued, these should not be publicly available.
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214 void operator=(const AttributeSetImpl &) = delete;
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215 AttributeSetImpl(const AttributeSetImpl &) = delete;
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216 public:
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217 AttributeSetImpl(LLVMContext &C,
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218 ArrayRef<std::pair<unsigned, AttributeSetNode *> > Attrs)
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219 : Context(C), NumAttrs(Attrs.size()) {
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220
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221 #ifndef NDEBUG
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222 if (Attrs.size() >= 2) {
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223 for (const std::pair<unsigned, AttributeSetNode *> *i = Attrs.begin() + 1,
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224 *e = Attrs.end();
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225 i != e; ++i) {
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226 assert((i-1)->first <= i->first && "Attribute set not ordered!");
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227 }
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228 }
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229 #endif
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230 // There's memory after the node where we can store the entries in.
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231 std::copy(Attrs.begin(), Attrs.end(), getTrailingObjects<IndexAttrPair>());
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232 }
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233
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234 /// \brief Get the context that created this AttributeSetImpl.
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235 LLVMContext &getContext() { return Context; }
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236
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237 /// \brief Return the number of attributes this AttributeSet contains.
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238 unsigned getNumAttributes() const { return NumAttrs; }
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239
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240 /// \brief Get the index of the given "slot" in the AttrNodes list. This index
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241 /// is the index of the return, parameter, or function object that the
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242 /// attributes are applied to, not the index into the AttrNodes list where the
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243 /// attributes reside.
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244 unsigned getSlotIndex(unsigned Slot) const {
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245 return getNode(Slot)->first;
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246 }
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247
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248 /// \brief Retrieve the attributes for the given "slot" in the AttrNode list.
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249 /// \p Slot is an index into the AttrNodes list, not the index of the return /
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250 /// parameter/ function which the attributes apply to.
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251 AttributeSet getSlotAttributes(unsigned Slot) const {
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252 return AttributeSet::get(Context, *getNode(Slot));
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253 }
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254
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255 /// \brief Retrieve the attribute set node for the given "slot" in the
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256 /// AttrNode list.
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257 AttributeSetNode *getSlotNode(unsigned Slot) const {
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258 return getNode(Slot)->second;
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259 }
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260
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261 typedef AttributeSetNode::iterator iterator;
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262 iterator begin(unsigned Slot) const { return getSlotNode(Slot)->begin(); }
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263 iterator end(unsigned Slot) const { return getSlotNode(Slot)->end(); }
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264
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265 void Profile(FoldingSetNodeID &ID) const {
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266 Profile(ID, makeArrayRef(getNode(0), getNumAttributes()));
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267 }
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268 static void Profile(FoldingSetNodeID &ID,
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269 ArrayRef<std::pair<unsigned, AttributeSetNode*> > Nodes) {
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270 for (unsigned i = 0, e = Nodes.size(); i != e; ++i) {
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271 ID.AddInteger(Nodes[i].first);
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272 ID.AddPointer(Nodes[i].second);
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273 }
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274 }
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275
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276 // FIXME: This atrocity is temporary.
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277 uint64_t Raw(unsigned Index) const;
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278
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279 void dump() const;
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280 };
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281
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282 } // end llvm namespace
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283
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284 #endif