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annotate include/llvm/MC/MCSymbol.h @ 77:54457678186b

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LLVM 3.6
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Mon, 08 Sep 2014 22:06:00 +0900
parents e4204d083e25
children 60c9769439b8
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1 //===- MCSymbol.h - Machine Code Symbols ------------------------*- 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 // This file contains the declaration of the MCSymbol class.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #ifndef LLVM_MC_MCSYMBOL_H
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15 #define LLVM_MC_MCSYMBOL_H
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16
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17 #include "llvm/ADT/StringRef.h"
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18 #include "llvm/Support/Compiler.h"
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19
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20 namespace llvm {
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21 class MCExpr;
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22 class MCSection;
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23 class MCContext;
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24 class raw_ostream;
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25
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26 /// MCSymbol - Instances of this class represent a symbol name in the MC file,
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27 /// and MCSymbols are created and unique'd by the MCContext class. MCSymbols
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28 /// should only be constructed with valid names for the object file.
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29 ///
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30 /// If the symbol is defined/emitted into the current translation unit, the
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31 /// Section member is set to indicate what section it lives in. Otherwise, if
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32 /// it is a reference to an external entity, it has a null section.
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33 class MCSymbol {
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34 // Special sentinal value for the absolute pseudo section.
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35 //
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36 // FIXME: Use a PointerInt wrapper for this?
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37 static const MCSection *AbsolutePseudoSection;
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38
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39 /// Name - The name of the symbol. The referred-to string data is actually
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40 /// held by the StringMap that lives in MCContext.
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41 StringRef Name;
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42
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43 /// Section - The section the symbol is defined in. This is null for
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44 /// undefined symbols, and the special AbsolutePseudoSection value for
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45 /// absolute symbols.
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46 const MCSection *Section;
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47
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48 /// Value - If non-null, the value for a variable symbol.
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49 const MCExpr *Value;
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50
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51 /// IsTemporary - True if this is an assembler temporary label, which
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52 /// typically does not survive in the .o file's symbol table. Usually
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53 /// "Lfoo" or ".foo".
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54 unsigned IsTemporary : 1;
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55
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56 /// IsUsed - True if this symbol has been used.
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57 mutable unsigned IsUsed : 1;
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58
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59 private: // MCContext creates and uniques these.
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60 friend class MCExpr;
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61 friend class MCContext;
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62 MCSymbol(StringRef name, bool isTemporary)
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63 : Name(name), Section(nullptr), Value(nullptr),
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64 IsTemporary(isTemporary), IsUsed(false) {}
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65
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66 MCSymbol(const MCSymbol&) LLVM_DELETED_FUNCTION;
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67 void operator=(const MCSymbol&) LLVM_DELETED_FUNCTION;
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68 public:
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69 /// getName - Get the symbol name.
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70 StringRef getName() const { return Name; }
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71
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72 /// @name Accessors
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73 /// @{
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74
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75 /// isTemporary - Check if this is an assembler temporary symbol.
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76 bool isTemporary() const { return IsTemporary; }
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77
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78 /// isUsed - Check if this is used.
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79 bool isUsed() const { return IsUsed; }
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80 void setUsed(bool Value) const { IsUsed = Value; }
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81
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82 /// @}
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83 /// @name Associated Sections
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84 /// @{
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85
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86 /// isDefined - Check if this symbol is defined (i.e., it has an address).
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87 ///
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88 /// Defined symbols are either absolute or in some section.
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89 bool isDefined() const {
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90 return Section != nullptr;
0
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91 }
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92
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93 /// isInSection - Check if this symbol is defined in some section (i.e., it
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94 /// is defined but not absolute).
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95 bool isInSection() const {
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96 return isDefined() && !isAbsolute();
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97 }
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98
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99 /// isUndefined - Check if this symbol undefined (i.e., implicitly defined).
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100 bool isUndefined() const {
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101 return !isDefined();
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102 }
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103
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104 /// isAbsolute - Check if this is an absolute symbol.
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105 bool isAbsolute() const {
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106 return Section == AbsolutePseudoSection;
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107 }
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108
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109 /// getSection - Get the section associated with a defined, non-absolute
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110 /// symbol.
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111 const MCSection &getSection() const {
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112 assert(isInSection() && "Invalid accessor!");
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113 return *Section;
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114 }
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115
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116 /// setSection - Mark the symbol as defined in the section \p S.
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117 void setSection(const MCSection &S) { Section = &S; }
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118
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119 /// setUndefined - Mark the symbol as undefined.
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120 void setUndefined() {
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121 Section = nullptr;
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122 }
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123
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124 /// setAbsolute - Mark the symbol as absolute.
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125 void setAbsolute() { Section = AbsolutePseudoSection; }
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126
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127 /// @}
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128 /// @name Variable Symbols
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129 /// @{
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130
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131 /// isVariable - Check if this is a variable symbol.
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132 bool isVariable() const {
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133 return Value != nullptr;
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134 }
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135
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136 /// getVariableValue() - Get the value for variable symbols.
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137 const MCExpr *getVariableValue() const {
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138 assert(isVariable() && "Invalid accessor!");
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139 IsUsed = true;
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140 return Value;
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141 }
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142
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143 // AliasedSymbol() - If this is an alias (a = b), return the symbol
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144 // we ultimately point to. For a non-alias, this just returns the symbol
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145 // itself.
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146 const MCSymbol &AliasedSymbol() const;
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147
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148 void setVariableValue(const MCExpr *Value);
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149
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150 /// @}
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151
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152 /// print - Print the value to the stream \p OS.
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153 void print(raw_ostream &OS) const;
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154
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155 /// dump - Print the value to stderr.
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156 void dump() const;
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157 };
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158
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159 inline raw_ostream &operator<<(raw_ostream &OS, const MCSymbol &Sym) {
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160 Sym.print(OS);
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161 return OS;
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162 }
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163 } // end namespace llvm
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164
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165 #endif