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annotate lib/CodeGen/AsmPrinter/DIEHash.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 7d135dc70f03
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1 //===-- llvm/CodeGen/DIEHash.h - Dwarf Hashing Framework -------*- 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 support for DWARF4 hashing of DIEs.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DIEHASH_H
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15 #define LLVM_LIB_CODEGEN_ASMPRINTER_DIEHASH_H
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16
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17 #include "llvm/ADT/DenseMap.h"
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18 #include "llvm/CodeGen/DIE.h"
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19 #include "llvm/Support/MD5.h"
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20
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21 namespace llvm {
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22
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23 class AsmPrinter;
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24 class CompileUnit;
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25
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26 /// \brief An object containing the capability of hashing and adding hash
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27 /// attributes onto a DIE.
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28 class DIEHash {
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29 // Collection of all attributes used in hashing a particular DIE.
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30 struct DIEAttrs {
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31 DIEValue DW_AT_name;
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32 DIEValue DW_AT_accessibility;
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33 DIEValue DW_AT_address_class;
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34 DIEValue DW_AT_allocated;
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35 DIEValue DW_AT_artificial;
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36 DIEValue DW_AT_associated;
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37 DIEValue DW_AT_binary_scale;
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38 DIEValue DW_AT_bit_offset;
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39 DIEValue DW_AT_bit_size;
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40 DIEValue DW_AT_bit_stride;
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41 DIEValue DW_AT_byte_size;
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42 DIEValue DW_AT_byte_stride;
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43 DIEValue DW_AT_const_expr;
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44 DIEValue DW_AT_const_value;
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45 DIEValue DW_AT_containing_type;
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46 DIEValue DW_AT_count;
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47 DIEValue DW_AT_data_bit_offset;
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48 DIEValue DW_AT_data_location;
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49 DIEValue DW_AT_data_member_location;
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50 DIEValue DW_AT_decimal_scale;
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51 DIEValue DW_AT_decimal_sign;
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52 DIEValue DW_AT_default_value;
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53 DIEValue DW_AT_digit_count;
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54 DIEValue DW_AT_discr;
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55 DIEValue DW_AT_discr_list;
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56 DIEValue DW_AT_discr_value;
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57 DIEValue DW_AT_encoding;
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58 DIEValue DW_AT_enum_class;
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59 DIEValue DW_AT_endianity;
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60 DIEValue DW_AT_explicit;
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61 DIEValue DW_AT_is_optional;
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62 DIEValue DW_AT_location;
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63 DIEValue DW_AT_lower_bound;
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64 DIEValue DW_AT_mutable;
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65 DIEValue DW_AT_ordering;
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66 DIEValue DW_AT_picture_string;
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67 DIEValue DW_AT_prototyped;
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68 DIEValue DW_AT_small;
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69 DIEValue DW_AT_segment;
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70 DIEValue DW_AT_string_length;
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71 DIEValue DW_AT_threads_scaled;
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72 DIEValue DW_AT_upper_bound;
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73 DIEValue DW_AT_use_location;
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74 DIEValue DW_AT_use_UTF8;
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75 DIEValue DW_AT_variable_parameter;
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76 DIEValue DW_AT_virtuality;
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77 DIEValue DW_AT_visibility;
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78 DIEValue DW_AT_vtable_elem_location;
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79 DIEValue DW_AT_type;
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80
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81 // Insert any additional ones here...
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82 };
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84 public:
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85 DIEHash(AsmPrinter *A = nullptr) : AP(A) {}
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86
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87 /// \brief Computes the ODR signature.
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88 uint64_t computeDIEODRSignature(const DIE &Die);
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89
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90 /// \brief Computes the CU signature.
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91 uint64_t computeCUSignature(const DIE &Die);
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92
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93 /// \brief Computes the type signature.
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94 uint64_t computeTypeSignature(const DIE &Die);
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95
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96 // Helper routines to process parts of a DIE.
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97 private:
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98 /// \brief Adds the parent context of \param Die to the hash.
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99 void addParentContext(const DIE &Die);
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100
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101 /// \brief Adds the attributes of \param Die to the hash.
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102 void addAttributes(const DIE &Die);
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103
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104 /// \brief Computes the full DWARF4 7.27 hash of the DIE.
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105 void computeHash(const DIE &Die);
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106
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107 // Routines that add DIEValues to the hash.
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108 public:
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109 /// \brief Adds \param Value to the hash.
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110 void update(uint8_t Value) { Hash.update(Value); }
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111
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112 /// \brief Encodes and adds \param Value to the hash as a ULEB128.
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113 void addULEB128(uint64_t Value);
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114
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115 /// \brief Encodes and adds \param Value to the hash as a SLEB128.
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116 void addSLEB128(int64_t Value);
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117
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118 private:
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119 /// \brief Adds \param Str to the hash and includes a NULL byte.
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120 void addString(StringRef Str);
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121
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122 /// \brief Collects the attributes of DIE \param Die into the \param Attrs
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123 /// structure.
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124 void collectAttributes(const DIE &Die, DIEAttrs &Attrs);
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125
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126 /// \brief Hashes the attributes in \param Attrs in order.
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127 void hashAttributes(const DIEAttrs &Attrs, dwarf::Tag Tag);
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128
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129 /// \brief Hashes the data in a block like DIEValue, e.g. DW_FORM_block or
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130 /// DW_FORM_exprloc.
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131 void hashBlockData(const DIE::const_value_range &Values);
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132
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133 /// \brief Hashes the contents pointed to in the .debug_loc section.
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134 void hashLocList(const DIELocList &LocList);
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135
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136 /// \brief Hashes an individual attribute.
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137 void hashAttribute(DIEValue Value, dwarf::Tag Tag);
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138
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139 /// \brief Hashes an attribute that refers to another DIE.
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140 void hashDIEEntry(dwarf::Attribute Attribute, dwarf::Tag Tag,
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141 const DIE &Entry);
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142
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143 /// \brief Hashes a reference to a named type in such a way that is
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144 /// independent of whether that type is described by a declaration or a
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145 /// definition.
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146 void hashShallowTypeReference(dwarf::Attribute Attribute, const DIE &Entry,
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147 StringRef Name);
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148
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149 /// \brief Hashes a reference to a previously referenced type DIE.
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150 void hashRepeatedTypeReference(dwarf::Attribute Attribute,
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151 unsigned DieNumber);
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152
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153 void hashNestedType(const DIE &Die, StringRef Name);
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154
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155 private:
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156 MD5 Hash;
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157 AsmPrinter *AP;
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158 DenseMap<const DIE *, unsigned> Numbering;
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159 };
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160 }
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161
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162 #endif