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annotate lib/CodeGen/AsmPrinter/DIEHash.h @ 33:e4204d083e25 LLVM3.5

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LLVM 3.5
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 14:32:10 +0900
parents 95c75e76d11b
children 54457678186b
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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 #include "DIE.h"
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15 #include "llvm/ADT/DenseMap.h"
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16 #include "llvm/Support/MD5.h"
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17
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18 namespace llvm {
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19
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20 class CompileUnit;
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21
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22 /// \brief An object containing the capability of hashing and adding hash
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23 /// attributes onto a DIE.
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24 class DIEHash {
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25 // The entry for a particular attribute.
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26 struct AttrEntry {
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27 const DIEValue *Val;
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28 const DIEAbbrevData *Desc;
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29 };
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30
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31 // Collection of all attributes used in hashing a particular DIE.
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32 struct DIEAttrs {
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33 AttrEntry DW_AT_name;
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34 AttrEntry DW_AT_accessibility;
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35 AttrEntry DW_AT_address_class;
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36 AttrEntry DW_AT_allocated;
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37 AttrEntry DW_AT_artificial;
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38 AttrEntry DW_AT_associated;
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39 AttrEntry DW_AT_binary_scale;
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40 AttrEntry DW_AT_bit_offset;
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41 AttrEntry DW_AT_bit_size;
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42 AttrEntry DW_AT_bit_stride;
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43 AttrEntry DW_AT_byte_size;
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44 AttrEntry DW_AT_byte_stride;
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45 AttrEntry DW_AT_const_expr;
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46 AttrEntry DW_AT_const_value;
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47 AttrEntry DW_AT_containing_type;
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48 AttrEntry DW_AT_count;
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49 AttrEntry DW_AT_data_bit_offset;
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50 AttrEntry DW_AT_data_location;
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51 AttrEntry DW_AT_data_member_location;
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52 AttrEntry DW_AT_decimal_scale;
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53 AttrEntry DW_AT_decimal_sign;
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54 AttrEntry DW_AT_default_value;
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55 AttrEntry DW_AT_digit_count;
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56 AttrEntry DW_AT_discr;
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57 AttrEntry DW_AT_discr_list;
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58 AttrEntry DW_AT_discr_value;
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59 AttrEntry DW_AT_encoding;
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60 AttrEntry DW_AT_enum_class;
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61 AttrEntry DW_AT_endianity;
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62 AttrEntry DW_AT_explicit;
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63 AttrEntry DW_AT_is_optional;
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64 AttrEntry DW_AT_location;
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65 AttrEntry DW_AT_lower_bound;
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66 AttrEntry DW_AT_mutable;
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67 AttrEntry DW_AT_ordering;
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68 AttrEntry DW_AT_picture_string;
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69 AttrEntry DW_AT_prototyped;
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70 AttrEntry DW_AT_small;
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71 AttrEntry DW_AT_segment;
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72 AttrEntry DW_AT_string_length;
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73 AttrEntry DW_AT_threads_scaled;
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74 AttrEntry DW_AT_upper_bound;
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75 AttrEntry DW_AT_use_location;
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76 AttrEntry DW_AT_use_UTF8;
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77 AttrEntry DW_AT_variable_parameter;
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78 AttrEntry DW_AT_virtuality;
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79 AttrEntry DW_AT_visibility;
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80 AttrEntry DW_AT_vtable_elem_location;
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81 AttrEntry DW_AT_type;
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82
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83 // Insert any additional ones here...
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84 };
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85
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86 public:
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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 private:
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109 /// \brief Encodes and adds \param Value to the hash as a ULEB128.
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110 void addULEB128(uint64_t Value);
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111
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112 /// \brief Encodes and adds \param Value to the hash as a SLEB128.
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113 void addSLEB128(int64_t Value);
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114
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115 /// \brief Adds \param Str to the hash and includes a NULL byte.
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116 void addString(StringRef Str);
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117
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118 /// \brief Collects the attributes of DIE \param Die into the \param Attrs
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119 /// structure.
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120 void collectAttributes(const DIE &Die, DIEAttrs &Attrs);
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121
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122 /// \brief Hashes the attributes in \param Attrs in order.
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123 void hashAttributes(const DIEAttrs &Attrs, dwarf::Tag Tag);
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124
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125 /// \brief Hashes an individual attribute.
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126 void hashAttribute(AttrEntry Attr, dwarf::Tag Tag);
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127
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128 /// \brief Hashes an attribute that refers to another DIE.
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129 void hashDIEEntry(dwarf::Attribute Attribute, dwarf::Tag Tag,
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130 const DIE &Entry);
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131
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132 /// \brief Hashes a reference to a named type in such a way that is
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133 /// independent of whether that type is described by a declaration or a
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134 /// definition.
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135 void hashShallowTypeReference(dwarf::Attribute Attribute, const DIE &Entry,
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136 StringRef Name);
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137
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138 /// \brief Hashes a reference to a previously referenced type DIE.
33
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139 void hashRepeatedTypeReference(dwarf::Attribute Attribute,
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140 unsigned DieNumber);
0
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141
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142 void hashNestedType(const DIE &Die, StringRef Name);
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143
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144 private:
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145 MD5 Hash;
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146 DenseMap<const DIE *, unsigned> Numbering;
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147 };
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148 }