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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT COMPILER COMPONENTS --
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4 -- --
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5 -- L I B . X R E F --
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6 -- --
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7 -- S p e c --
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8 -- --
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131
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9 -- Copyright (C) 1998-2018, Free Software Foundation, Inc. --
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111
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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17 -- for more details. You should have received a copy of the GNU General --
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18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
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19 -- http://www.gnu.org/licenses for a complete copy of the license. --
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20 -- --
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21 -- GNAT was originally developed by the GNAT team at New York University. --
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22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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23 -- --
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24 ------------------------------------------------------------------------------
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25
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26 -- This package contains for collecting and outputting cross-reference
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27 -- information.
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28
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131
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29 with Einfo; use Einfo;
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30 with SPARK_Xrefs;
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111
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31
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32 package Lib.Xref is
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33
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34 -------------------------------------------------------
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35 -- Format of Cross-Reference Information in ALI File --
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36 -------------------------------------------------------
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37
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38 -- Cross-reference sections follow the dependency section (D lines) in
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39 -- an ALI file, so that they need not be read by gnatbind, gnatmake etc.
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40
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41 -- A cross reference section has a header of the form
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42
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43 -- X dependency-number filename
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44
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45 -- This header precedes xref information (entities/references from
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46 -- the unit), identified by dependency number and file name. The
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47 -- dependency number is the index into the generated D lines and
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48 -- is ones origin (e.g. 2 = reference to second generated D line).
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49
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50 -- Note that the filename here will reflect the original name if
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51 -- a Source_Reference pragma was encountered (since all line number
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52 -- references will be with respect to the original file).
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53
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54 -- The lines following the header look like
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55
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56 -- line type col level entity renameref instref typeref overref ref ref
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57
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58 -- line is the line number of the referenced entity. The name of
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59 -- the entity starts in column col. Columns are numbered from one,
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60 -- and if horizontal tab characters are present, the column number
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61 -- is computed assuming standard 1,9,17,.. tab stops. For example,
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62 -- if the entity is the first token on the line, and is preceded
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63 -- by space-HT-space, then the column would be column 10.
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64
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65 -- type is a single letter identifying the type of the entity. See
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66 -- next section (Cross-Reference Entity Identifiers) for a full list
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67 -- of the characters used).
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68
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69 -- col is the column number of the referenced entity
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70
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71 -- level is a single character that separates the col and entity
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72 -- fields. It is an asterisk (*) for a top level library entity that
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73 -- is publicly visible, as well for an entity declared in the visible
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74 -- part of a generic package, the plus sign (+) for a C/C++ static
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75 -- entity, and space otherwise.
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76
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77 -- entity is the name of the referenced entity, with casing in
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78 -- the canonical casing for the source file where it is defined.
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79
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80 -- renameref provides information on renaming. If the entity is
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81 -- a package, object or overloadable entity which is declared by
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82 -- a renaming declaration, and the renaming refers to an entity
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83 -- with a simple identifier or expanded name, then renameref has
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84 -- the form:
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85
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86 -- =line:col
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87
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88 -- Here line:col give the reference to the identifier that appears
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89 -- in the renaming declaration. Note that we never need a file entry,
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90 -- since this identifier is always in the current file in which the
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91 -- entity is declared. Currently, renameref appears only for the
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92 -- simple renaming case. If the renaming reference is a complex
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93 -- expressions, then renameref is omitted. Here line/col give
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94 -- line/column as defined above.
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95
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96 -- instref is only present for package and subprogram instances. The
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97 -- information in instref is the location of the point of declaration
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98 -- of the generic parent unit. This part has the form:
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99
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100 -- [file|line]
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101
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102 -- without column information, on the reasonable assumption that
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103 -- there is only one unit per line (the same assumption is made in
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104 -- references to entities declared within instances, see below).
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105
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106 -- typeref is the reference for a related type. This part is
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107 -- optional. It is present for the following cases:
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108
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109 -- derived types (points to the parent type) LR=<>
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110 -- access types (points to designated type) LR=()
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111 -- array types (points to component type) LR=()
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112 -- subtypes (points to ancestor type) LR={}
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113 -- functions (points to result type) LR={}
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114 -- enumeration literals (points to enum type) LR={}
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115 -- objects and components (points to type) LR={}
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116
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117 -- For a type that implements multiple interfaces, there is an
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118 -- entry of the form LR=<> for each of the interfaces appearing
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119 -- in the type declaration. In the data structures of ali.ads,
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120 -- the type that the entity extends (or the first interface if
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121 -- there is no such type) is stored in Xref_Entity_Record.Tref*,
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122 -- additional interfaces are stored in the list of references
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123 -- with a special type of Interface_Reference.
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124
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125 -- For an array type, there is an entry of the form LR=<> for each
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126 -- of the index types appearing in the type declaration. The index
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127 -- types follow the entry for the component type. In the data
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128 -- structures of ali.ads, however, the list of index types are
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129 -- output in the list of references with a special Rtype set to
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130 -- Array_Index_Reference.
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131
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132 -- In the above list LR shows the brackets used in the output which
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133 -- has one of the two following forms:
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134
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135 -- L file | line type col R user entity
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136 -- L name-in-lower-case R standard entity
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137
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138 -- For the form for a user entity, file is the dependency number
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139 -- of the file containing the declaration of the related type.
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140 -- This number and the following vertical bar are omitted if the
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141 -- relevant type is defined in the same file as the current entity.
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142 -- The line, type, col are defined as previously described, and
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143 -- specify the location of the relevant type declaration in the
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144 -- referenced file. For the standard entity form, the name between
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145 -- the brackets is the normal name of the entity in lower case.
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146
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147 -- overref is present for overriding operations (procedures and
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148 -- functions), and provides information on the operation that it
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149 -- overrides. This information has the format:
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150
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151 -- '<' file | line 'o' col '>'
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152
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153 -- file is the dependency number of the file containing the
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154 -- declaration of the overridden operation. It and the following
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155 -- vertical bar are omitted if the file is the same as that of
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156 -- the overriding operation.
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157
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158 -- There may be zero or more ref entries on each line
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159
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160 -- file | line type col [...]
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161
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162 -- file is the dependency number of the file with the reference.
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163 -- It and the following vertical bar are omitted if the file is
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164 -- the same as the previous ref, and the refs for the current
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165 -- file are first (and do not need a bar).
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166
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167 -- line is the line number of the reference
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168
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169 -- col is the column number of the reference, as defined above
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170
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171 -- type is one of
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172 -- b = body entity
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173 -- c = completion of private or incomplete type
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174 -- d = discriminant of type
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175 -- D = object definition
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176 -- e = end of spec
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177 -- E = first private entity
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178 -- H = abstract type
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179 -- i = implicit reference
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180 -- k = implicit reference to parent unit in child unit
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181 -- l = label on END line
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182 -- m = modification
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183 -- o = own variable reference (SPARK only)
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184 -- p = primitive operation
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185 -- P = overriding primitive operation
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186 -- r = reference
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187 -- R = subprogram reference in dispatching call
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188 -- s = subprogram reference in a static call
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189 -- t = end of body
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190 -- w = WITH line
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191 -- x = type extension
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192 -- z = generic formal parameter
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193 -- > = subprogram IN parameter
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194 -- = = subprogram IN OUT parameter
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195 -- < = subprogram OUT parameter
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196 -- ^ = subprogram ACCESS parameter
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197
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198 -- b is used for spec entities that are repeated in a body,
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199 -- including the unit (subprogram, package, task, protected body,
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200 -- protected entry) name itself, and in the case of a subprogram,
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201 -- the formals. This letter is also used for the occurrence of
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202 -- entry names in accept statements. Such entities are not
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203 -- considered to be definitions for cross-referencing purposes,
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204 -- but rather are considered to be references to the corresponding
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205 -- spec entities, marked with this special type.
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206
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207 -- c is similar to b but is used to mark the completion of a
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208 -- private or incomplete type. As with b, the completion is not
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209 -- regarded as a separate definition, but rather a reference to
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210 -- the initial declaration, marked with this special type.
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211
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212 -- d is used to identify a discriminant of a type. If this is
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213 -- an incomplete or private type with discriminants, the entry
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214 -- denotes the occurrence of the discriminant in the partial view
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215 -- which is also the point of definition of the discriminant. The
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216 -- occurrence of the same discriminant in the full view is a
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217 -- regular reference to it.
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218
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219 -- e is used to identify the end of a construct in the following
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220 -- cases:
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221
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222 -- Block Statement end [block_IDENTIFIER];
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223 -- Loop Statement end loop [loop_IDENTIFIER];
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224 -- Package Specification end [[PARENT_UNIT_NAME .] IDENTIFIER];
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225 -- Task Definition end [task_IDENTIFIER];
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226 -- Protected Definition end [protected_IDENTIFIER];
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227 -- Record Definition end record;
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228 -- Enumeration Definition );
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229
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230 -- Note that 'e' entries are special in that they appear even
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231 -- in referencing units (normally xref entries appear only for
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232 -- references in the extended main source unit (see Lib) to which
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233 -- the ali applies. But 'e' entries are really structural and
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234 -- simply indicate where packages end. This information can be
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235 -- used to reconstruct scope information for any entities
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236 -- referenced from within the package. The line/column values
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237 -- for these entries point to the semicolon ending the construct.
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238
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239 -- i is used to identify a reference to the entity in a generic
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240 -- actual or in a default in a call. The node that denotes the
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241 -- entity does not come from source, but it has the Sloc of the
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242 -- source node that generates the implicit reference, and it is
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243 -- useful to record this one.
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244
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245 -- k is another non-standard reference type, used to record a
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246 -- reference from a child unit to its parent. For various cross-
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247 -- referencing tools, we need a pointer from the xref entries for
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248 -- the child to the parent. This is the opposite way round from
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249 -- normal xref entries, since the reference is *from* the child
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250 -- unit *to* the parent unit, yet appears in the xref entries for
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251 -- the child. Consider this example:
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252 --
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253 -- package q is
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254 -- end;
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255 -- package q.r is
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256 -- end q.r;
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257 --
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258 -- The ali file for q-r.ads has these entries
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259 --
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260 -- D q.ads
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261 -- D q-r.ads
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262 -- D system.ads
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263 -- X 1 q.ads
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264 -- 1K9*q 2e4 2|1r9 2r5
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265 -- X 2 q-r.ads
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266 -- 1K11*r 1|1k9 2|2l7 2e8
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267 --
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268 -- Here the 2|1r9 entry appearing in the section for the parent
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269 -- is the normal reference from the child to the parent. The 1k9
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270 -- entry in the section for the child duplicates this information
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271 -- but appears in the child rather than the parent.
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272
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273 -- l is used to identify the occurrence in the source of the name
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274 -- on an end line. This is just a syntactic reference which can be
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275 -- ignored for semantic purposes (e.g. a call graph construction).
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276 -- Again, in the case of an accept there can be multiple l lines.
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277
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278 -- o is used for variables referenced from a SPARK 'own'
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279 -- definition. In the SPARK language, it is allowed to use a
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280 -- variable before its actual declaration.
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281
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282 -- p is used to mark a primitive operation of the given entity.
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283 -- For example, if we have a type Tx, and a primitive operation
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284 -- Pq of this type, then an entry in the list of references to
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285 -- Tx will point to the declaration of Pq. Note that this entry
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286 -- type is unusual because it an implicit rather than explicit,
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287 -- and the name of the reference does not match the name of the
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288 -- entity for which a reference is generated. These entries are
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289 -- generated only for entities declared in the extended main
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290 -- source unit (main unit itself, its separate spec (if any).
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291 -- and all subunits (considered recursively).
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292
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293 -- If the primitive operation overrides an inherited primitive
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294 -- operation of the parent type, the letter 'P' is used in the
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295 -- corresponding entry.
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296
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297 -- R is used to mark a dispatching call. The reference is to
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298 -- the specification of the primitive operation of the root
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299 -- type when the call has a controlling argument in its class.
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300
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301 -- s is used to mark a static subprogram call. The reference is
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302 -- to the specification of the subprogram being called.
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303
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304 -- t is similar to e. It identifies the end of a corresponding
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305 -- body (such a reference always links up with a b reference)
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306
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307 -- Subprogram Body end [DESIGNATOR];
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308 -- Package Body end [[PARENT_UNIT_NAME .] IDENTIFIER];
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309 -- Task Body end [task_IDENTIFIER];
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310 -- Entry Body end [entry_IDENTIFIER];
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311 -- Protected Body end [protected_IDENTIFIER]
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312 -- Accept Statement end [entry_IDENTIFIER]];
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313
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314 -- Note that in the case of accept statements, there can
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315 -- be multiple b and t entries for the same entity.
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316
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317 -- x is used to identify the reference as the entity from which a
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318 -- tagged type is extended. This allows immediate access to the
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319 -- parent of a tagged type.
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320
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321 -- z is used on the cross-reference line for a generic unit,
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322 -- to mark the definition of a generic formal of the unit. This
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323 -- entry type is similar to 'k' and 'p' in that it is an implicit
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324 -- reference for an entity with a different name.
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325
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326 -- The characters >, <. =, and ^ are used on the cross-reference
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327 -- line for a subprogram, to denote formal parameters and their
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328 -- modes. As with the 'z' and 'p' entries, each such entry is
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329 -- an implicit reference to an entity with a different name.
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330
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331 -- [..] is used for generic instantiation references. These
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332 -- references are present only if the entity in question is
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333 -- a generic entity, and in that case the [..] contains the
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334 -- reference for the instantiation. In the case of nested
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335 -- instantiations, this can be nested [...[...[...]]] etc. The
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336 -- reference is of the form [file|line] no column is present since
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337 -- it is assumed that only one instantiation appears on a single
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338 -- source line. Note that the appearance of file numbers in such
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339 -- references follows the normal rules (present only if needed,
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340 -- and resets the current file for subsequent references).
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341
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342 -- Examples:
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343
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344 -- 44B5*Flag_Type{boolean} 5r23 6m45 3|9r35 11r56
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345
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346 -- This line gives references for the publicly visible Boolean
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347 -- type Flag_Type declared on line 44, column 5. There are four
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348 -- references
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349
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350 -- a reference on line 5, column 23 of the current file
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351
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352 -- a modification on line 6, column 45 of the current file
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353
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354 -- a reference on line 9, column 35 of unit number 3
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355
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356 -- a reference on line 11, column 56 of unit number 3
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357
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358 -- 2U13 p3=2:35 5b13 8r4 12r13 12t15
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359
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360 -- This line gives references for the non-publicly visible
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361 -- procedure p3 declared on line 2, column 13. This procedure
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362 -- renames the procedure whose identifier reference is at
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363 -- line 2 column 35. There are four references:
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364
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365 -- the corresponding body entity at line 5, column 13,
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366 -- of the current file.
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367
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368 -- a reference (e.g. a call) at line 8 column 4 of the
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369 -- current file.
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370
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371 -- the END line of the body has an explicit reference to
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372 -- the name of the procedure at line 12, column 13.
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373
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374 -- the body ends at line 12, column 15, just past this label
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375
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376 -- 16I9*My_Type<2|4I9> 18r8
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377
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378 -- This line gives references for the publicly visible Integer
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379 -- derived type My_Type declared on line 16, column 9. It also
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380 -- gives references to the parent type declared in the unit
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381 -- number 2 on line 4, column 9. There is one reference:
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382
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383 -- a reference (e.g. a variable declaration) at line 18 column
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384 -- 4 of the current file.
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385
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|
386 -- 10I3*Genv{integer} 3|4I10[6|12]
|
|
|
387
|
|
|
388 -- This line gives a reference for the entity Genv in a generic
|
|
|
389 -- package. The reference in file 3, line 4, col 10, refers to an
|
|
|
390 -- instance of the generic where the instantiation can be found in
|
|
|
391 -- file 6 at line 12.
|
|
|
392
|
|
|
393 -- Continuation lines are used if the reference list gets too long,
|
|
|
394 -- a continuation line starts with a period, and then has references
|
|
|
395 -- continuing from the previous line. The references are sorted first
|
|
|
396 -- by unit, then by position in the source.
|
|
|
397
|
|
|
398 -- Note on handling of generic entities. The cross-reference is oriented
|
|
|
399 -- towards source references, so the entities in a generic instantiation
|
|
|
400 -- are not considered distinct from the entities in the template. All
|
|
|
401 -- definitions and references from generic instantiations are suppressed,
|
|
|
402 -- since they will be generated from the template. Any references to
|
|
|
403 -- entities in a generic instantiation from outside the instantiation
|
|
|
404 -- are considered to be references to the original template entity.
|
|
|
405
|
|
|
406 ----------------------------------------
|
|
|
407 -- Cross-Reference Entity Identifiers --
|
|
|
408 ----------------------------------------
|
|
|
409
|
|
|
410 -- In the cross-reference section of the ali file, entity types are
|
|
|
411 -- identified by a single letter, indicating the entity type. The following
|
|
|
412 -- table indicates the letter. A space for an entry is used for entities
|
|
|
413 -- that do not appear in the cross-reference table.
|
|
|
414
|
|
|
415 -- For objects, the character * appears in this table. In the xref listing,
|
|
|
416 -- this character is replaced by the lower case letter that corresponds to
|
|
|
417 -- the type of the object. For example, if a variable is of a Float type,
|
|
|
418 -- then, since the type is represented by an upper case F, the object would
|
|
|
419 -- be represented by a lower case f.
|
|
|
420
|
|
|
421 -- A special exception is the case of booleans, whose entities are normal
|
|
|
422 -- E_Enumeration_Type or E_Enumeration_Subtype entities, but which appear
|
|
|
423 -- as B/b in the xref lines, rather than E/e.
|
|
|
424
|
|
|
425 -- For private types, the character + appears in the table. In this case
|
|
|
426 -- the kind of the underlying type is used, if available, to determine the
|
|
|
427 -- character to use in the xref listing. The listing will still include a
|
|
|
428 -- '+' for a generic private type, for example, but will retain the '*' for
|
|
|
429 -- an object or formal parameter of such a type.
|
|
|
430
|
|
|
431 -- For subprograms, the characters 'U' and 'V' appear in the table,
|
|
|
432 -- indicating procedures and functions. If the operation is abstract,
|
|
|
433 -- these letters are replaced in the xref by 'x' and 'y' respectively.
|
|
|
434
|
|
|
435 Xref_Entity_Letters : constant array (Entity_Kind) of Character :=
|
|
|
436 (E_Abstract_State => '@',
|
|
|
437 E_Access_Attribute_Type => 'P',
|
|
|
438 E_Access_Protected_Subprogram_Type => 'P',
|
|
|
439 E_Access_Subprogram_Type => 'P',
|
|
|
440 E_Access_Subtype => 'P',
|
|
|
441 E_Access_Type => 'P',
|
|
|
442 E_Allocator_Type => ' ',
|
|
|
443 E_Anonymous_Access_Protected_Subprogram_Type => ' ',
|
|
|
444 E_Anonymous_Access_Subprogram_Type => ' ',
|
|
|
445 E_Anonymous_Access_Type => ' ',
|
|
|
446 E_Array_Subtype => 'A',
|
|
|
447 E_Array_Type => 'A',
|
|
|
448 E_Block => 'q',
|
|
|
449 E_Class_Wide_Subtype => 'C',
|
|
|
450 E_Class_Wide_Type => 'C',
|
|
|
451 E_Component => '*',
|
|
|
452 E_Constant => '*',
|
|
|
453 E_Decimal_Fixed_Point_Subtype => 'D',
|
|
|
454 E_Decimal_Fixed_Point_Type => 'D',
|
|
|
455 E_Discriminant => '*',
|
|
|
456 E_Entry => 'Y',
|
|
|
457 E_Entry_Family => 'Y',
|
|
|
458 E_Entry_Index_Parameter => '*',
|
|
|
459 E_Enumeration_Literal => 'n',
|
|
|
460 E_Enumeration_Subtype => 'E', -- B for boolean
|
|
|
461 E_Enumeration_Type => 'E', -- B for boolean
|
|
|
462 E_Exception => 'X',
|
|
|
463 E_Exception_Type => ' ',
|
|
|
464 E_Floating_Point_Subtype => 'F',
|
|
|
465 E_Floating_Point_Type => 'F',
|
|
|
466 E_Function => 'V',
|
|
|
467 E_General_Access_Type => 'P',
|
|
|
468 E_Generic_Function => 'v',
|
|
|
469 E_Generic_In_Out_Parameter => '*',
|
|
|
470 E_Generic_In_Parameter => '*',
|
|
|
471 E_Generic_Package => 'k',
|
|
|
472 E_Generic_Procedure => 'u',
|
|
|
473 E_Label => 'L',
|
|
|
474 E_Limited_Private_Subtype => '+',
|
|
|
475 E_Limited_Private_Type => '+',
|
|
|
476 E_Loop => 'l',
|
|
|
477 E_Loop_Parameter => '*',
|
|
|
478 E_In_Out_Parameter => '*',
|
|
|
479 E_In_Parameter => '*',
|
|
|
480 E_Incomplete_Subtype => '+',
|
|
|
481 E_Incomplete_Type => '+',
|
|
|
482 E_Modular_Integer_Subtype => 'M',
|
|
|
483 E_Modular_Integer_Type => 'M',
|
|
|
484 E_Named_Integer => 'N',
|
|
|
485 E_Named_Real => 'N',
|
|
|
486 E_Operator => 'V',
|
|
|
487 E_Ordinary_Fixed_Point_Subtype => 'O',
|
|
|
488 E_Ordinary_Fixed_Point_Type => 'O',
|
|
|
489 E_Out_Parameter => '*',
|
|
|
490 E_Package => 'K',
|
|
|
491 E_Private_Subtype => '+',
|
|
|
492 E_Private_Type => '+',
|
|
|
493 E_Procedure => 'U',
|
|
|
494 E_Protected_Subtype => 'W',
|
|
|
495 E_Protected_Type => 'W',
|
|
|
496 E_Record_Subtype => 'R',
|
|
|
497 E_Record_Subtype_With_Private => 'R',
|
|
|
498 E_Record_Type => 'R',
|
|
|
499 E_Record_Type_With_Private => 'R',
|
|
|
500 E_Return_Statement => ' ',
|
|
|
501 E_Signed_Integer_Subtype => 'I',
|
|
|
502 E_Signed_Integer_Type => 'I',
|
|
|
503 E_String_Literal_Subtype => ' ',
|
|
|
504 E_Subprogram_Type => ' ',
|
|
|
505 E_Task_Subtype => 'T',
|
|
|
506 E_Task_Type => 'T',
|
|
|
507 E_Variable => '*',
|
|
|
508 E_Void => ' ',
|
|
|
509
|
|
|
510 -- The following entities are not ones to which we gather the cross-
|
|
|
511 -- references, since it does not make sense to do so (e.g. references
|
|
|
512 -- to a package are to the spec, not the body). Indeed the occurrence of
|
|
|
513 -- the body entity is considered to be a reference to the spec entity.
|
|
|
514
|
|
|
515 E_Package_Body => ' ',
|
|
|
516 E_Protected_Body => ' ',
|
|
|
517 E_Protected_Object => ' ',
|
|
|
518 E_Subprogram_Body => ' ',
|
|
|
519 E_Task_Body => ' ');
|
|
|
520
|
|
|
521 -- The following table is for information purposes. It shows the use of
|
|
|
522 -- each character appearing as an entity type.
|
|
|
523
|
|
|
524 -- letter lower case usage UPPER CASE USAGE
|
|
|
525
|
|
|
526 -- a array object (except string) array type (except string)
|
|
|
527 -- b Boolean object Boolean type
|
|
|
528 -- c class-wide object class-wide type
|
|
|
529 -- d decimal fixed-point object decimal fixed-point type
|
|
|
530 -- e non-Boolean enumeration object non_Boolean enumeration type
|
|
|
531 -- f floating-point object floating-point type
|
|
|
532 -- g C/C++ macro C/C++ fun-like macro
|
|
|
533 -- h Interface (Ada 2005) Abstract type
|
|
|
534 -- i signed integer object signed integer type
|
|
|
535 -- j C++ class object C++ class
|
|
|
536 -- k generic package package
|
|
|
537 -- l label on loop label on statement
|
|
|
538 -- m modular integer object modular integer type
|
|
|
539 -- n enumeration literal named number
|
|
|
540 -- o ordinary fixed-point object ordinary fixed-point type
|
|
|
541 -- p access object access type
|
|
|
542 -- q label on block C/C++ include file
|
|
|
543 -- r record object record type
|
|
|
544 -- s string object string type
|
|
|
545 -- t task object task type
|
|
|
546 -- u generic procedure procedure
|
|
|
547 -- v generic function or operator function or operator
|
|
|
548 -- w protected object protected type
|
|
|
549 -- x abstract procedure exception
|
|
|
550 -- y abstract function entry or entry family
|
|
|
551 -- z generic formal parameter (unused)
|
|
|
552
|
|
|
553 ---------------------------------------------------
|
|
|
554 -- Handling of Imported and Exported Subprograms --
|
|
|
555 ---------------------------------------------------
|
|
|
556
|
|
|
557 -- If a pragma Import or Interface applies to a subprogram, the pragma is
|
|
|
558 -- the completion of the subprogram. This is noted in the ALI file by
|
|
|
559 -- making the occurrence of the subprogram in the pragma into a body
|
|
|
560 -- reference ('b') and by including the external name of the subprogram and
|
|
|
561 -- its language, bracketed by '<' and '>' in that reference. For example:
|
|
|
562
|
|
|
563 -- 3U13*imported_proc 4b<c,there>21
|
|
|
564
|
|
|
565 -- indicates that procedure imported_proc, declared at line 3, has a pragma
|
|
|
566 -- Import at line 4, that its body is in C, and that the link name as given
|
|
|
567 -- in the pragma is "there".
|
|
|
568
|
|
|
569 -- If a pragma Export applies to a subprogram exported to a foreign
|
|
|
570 -- language (ie. the pragma has convention different from Ada), then the
|
|
|
571 -- pragma is annotated in the ALI file by making the occurrence of the
|
|
|
572 -- subprogram in the pragma into an implicit reference ('i') and by
|
|
|
573 -- including the external name of the subprogram and its language,
|
|
|
574 -- bracketed by '<' and '>' in that reference. For example:
|
|
|
575
|
|
|
576 -- 3U13*exported_proc 4i<c,here>21
|
|
|
577
|
|
|
578 -- indicates that procedure exported_proc, declared at line 3, has a pragma
|
|
|
579 -- Export at line 4, that its body is exported to C, and that the link name
|
|
|
580 -- as given in the pragma is "here".
|
|
|
581
|
|
|
582 -------------------------
|
|
|
583 -- Deferred_References --
|
|
|
584 -------------------------
|
|
|
585
|
|
|
586 -- Normally we generate references as we go along, but as discussed in
|
|
|
587 -- Sem_Util.Is_LHS, and Sem_Ch8.Find_Direct_Name/Find_Selected_Component,
|
|
|
588 -- we have one case where that is tricky, which is when we have something
|
|
|
589 -- like X.A := 3, where we don't know until we know the type of X whether
|
|
|
590 -- this is a reference (if X is an access type, so what we really have is
|
|
|
591 -- X.all.A := 3) or a modification, where X is not an access type.
|
|
|
592
|
|
|
593 -- What we do in such cases is to gather nodes, where we would have liked
|
|
|
594 -- to call Generate_Reference but we couldn't because we didn't know enough
|
|
|
595 -- into this table, Then we deal with generating references later on when
|
|
|
596 -- we have sufficient information to do it right.
|
|
|
597
|
|
|
598 type Deferred_Reference_Entry is record
|
|
|
599 E : Entity_Id;
|
|
|
600 N : Node_Id;
|
|
|
601 end record;
|
|
|
602 -- One entry, E, N are as required for Generate_Reference call
|
|
|
603
|
|
|
604 package Deferred_References is new Table.Table (
|
|
|
605 Table_Component_Type => Deferred_Reference_Entry,
|
|
|
606 Table_Index_Type => Int,
|
|
|
607 Table_Low_Bound => 0,
|
|
|
608 Table_Initial => 512,
|
|
|
609 Table_Increment => 200,
|
|
|
610 Table_Name => "Name_Deferred_References");
|
|
|
611
|
|
|
612 procedure Process_Deferred_References;
|
|
|
613 -- This procedure is called from Frontend to process these table entries.
|
|
|
614 -- It is also called from Sem_Warn.
|
|
|
615
|
|
|
616 function Has_Deferred_Reference (Ent : Entity_Id) return Boolean;
|
|
|
617 -- Determine whether arbitrary entity Ent has a pending reference in order
|
|
|
618 -- to suppress premature warnings about useless assignments. See comments
|
|
|
619 -- in Analyze_Assignment in sem_ch5.adb.
|
|
|
620
|
|
|
621 -----------------------------
|
|
|
622 -- SPARK Xrefs Information --
|
|
|
623 -----------------------------
|
|
|
624
|
|
|
625 -- This package defines procedures for collecting SPARK cross-reference
|
|
|
626 -- information and printing in ALI files.
|
|
|
627
|
|
|
628 package SPARK_Specific is
|
|
|
629
|
|
|
630 function Enclosing_Subprogram_Or_Library_Package
|
|
|
631 (N : Node_Id) return Entity_Id;
|
|
|
632 -- Return the closest enclosing subprogram or library-level package.
|
|
|
633 -- This ensures that GNATprove can distinguish local variables from
|
|
|
634 -- global variables.
|
|
131
|
635 --
|
|
|
636 -- ??? This routine should only be used for processing related to
|
|
|
637 -- cross-references, where it might return wrong result but must avoid
|
|
|
638 -- crashes on ill-formed source code. It is wrong to use it where exact
|
|
|
639 -- result is needed.
|
|
111
|
640
|
|
|
641 procedure Generate_Dereference
|
|
|
642 (N : Node_Id;
|
|
|
643 Typ : Character := 'r');
|
|
|
644 -- This procedure is called to record a dereference. N is the location
|
|
|
645 -- of the dereference.
|
|
|
646
|
|
|
647 generic
|
|
131
|
648 with procedure Process
|
|
|
649 (Index : Int;
|
|
|
650 Xref : SPARK_Xrefs.SPARK_Xref_Record);
|
|
|
651 procedure Iterate_SPARK_Xrefs;
|
|
|
652 -- Call Process on cross-references relevant to the SPARK backend with
|
|
|
653 -- parameter Xref holding the relevant subset of the xref entry and
|
|
|
654 -- Index holding the position in the original tables with references
|
|
|
655 -- (if positive) or dereferences (if negative).
|
|
111
|
656
|
|
|
657 end SPARK_Specific;
|
|
|
658
|
|
|
659 -----------------
|
|
|
660 -- Subprograms --
|
|
|
661 -----------------
|
|
|
662
|
|
|
663 procedure Generate_Definition (E : Entity_Id);
|
|
|
664 -- Records the definition of an entity
|
|
|
665
|
|
|
666 procedure Generate_Operator_Reference
|
|
|
667 (N : Node_Id;
|
|
|
668 T : Entity_Id);
|
|
|
669 -- Node N is an operator node, whose entity has been set. If this entity
|
|
|
670 -- is a user defined operator (i.e. an operator not defined in package
|
|
|
671 -- Standard), then a reference to the operator is recorded at node N.
|
|
|
672 -- T is the operand type of the operator. A reference to the operator is an
|
|
|
673 -- implicit reference to the type, and that needs to be recorded to avoid
|
|
|
674 -- spurious warnings on unused entities, when the operator is a renaming of
|
|
|
675 -- a predefined operator.
|
|
|
676
|
|
|
677 procedure Generate_Reference
|
|
|
678 (E : Entity_Id;
|
|
|
679 N : Node_Id;
|
|
|
680 Typ : Character := 'r';
|
|
|
681 Set_Ref : Boolean := True;
|
|
|
682 Force : Boolean := False);
|
|
|
683 -- This procedure is called to record a reference. N is the location of the
|
|
|
684 -- reference and E is the referenced entity. Typ is one of:
|
|
|
685 --
|
|
|
686 -- a character already described in the description of ref entries above
|
|
|
687 -- ' ' for dummy reference (see below)
|
|
|
688 --
|
|
|
689 -- Note: all references to incomplete or private types are to the original
|
|
|
690 -- (incomplete or private type) declaration. The full declaration is
|
|
|
691 -- treated as a reference with type 'c'.
|
|
|
692 --
|
|
|
693 -- Note: all references to packages or subprograms are to the entity for
|
|
|
694 -- the spec. The entity in the body is treated as a reference with type
|
|
|
695 -- 'b'. Similar handling for references to subprogram formals.
|
|
|
696 --
|
|
|
697 -- The call has no effect if N is not in the extended main source unit.
|
|
|
698 -- This check is omitted for type 'e' references (where it is useful to
|
|
|
699 -- have structural scoping information for other than the main source),
|
|
|
700 -- and for 'p' (since we want to pick up inherited primitive operations
|
|
|
701 -- that are defined in other packages).
|
|
|
702 --
|
|
|
703 -- The call also has no effect if any of the following conditions hold:
|
|
|
704 --
|
|
|
705 -- cross-reference collection is disabled
|
|
|
706 -- entity does not come from source (and Force is False)
|
|
|
707 -- reference does not come from source (and Force is False)
|
|
|
708 -- the entity is not one for which xrefs are appropriate
|
|
|
709 -- the type letter is blank
|
|
|
710 -- the node N is not an identifier, defining identifier, or expanded name
|
|
|
711 -- the type is 'p' and the entity is not in the extended main source
|
|
|
712 --
|
|
|
713 -- If all these conditions are met, then the Is_Referenced flag of E is set
|
|
|
714 -- (unless Set_Ref is False) and a cross-reference entry is recorded for
|
|
|
715 -- later output when Output_References is called.
|
|
|
716 --
|
|
|
717 -- Note: the dummy space entry is for the convenience of some callers,
|
|
|
718 -- who find it easier to pass a space to suppress the entry than to do
|
|
|
719 -- a specific test. The call has no effect if the type is a space.
|
|
|
720 --
|
|
|
721 -- The parameter Set_Ref is normally True, and indicates that in addition
|
|
|
722 -- to generating a cross-reference, the Referenced flag of the specified
|
|
|
723 -- entity should be set. If this parameter is False, then setting of the
|
|
|
724 -- Referenced flag is inhibited.
|
|
|
725 --
|
|
|
726 -- The parameter Force is set to True to force a reference to be generated
|
|
|
727 -- even if Comes_From_Source is false. This is used for certain implicit
|
|
|
728 -- references, and also for end label references.
|
|
|
729
|
|
|
730 procedure Generate_Reference_To_Formals (E : Entity_Id);
|
|
|
731 -- Add a reference to the definition of each formal on the line for
|
|
|
732 -- a subprogram or an access_to_subprogram type.
|
|
|
733
|
|
|
734 procedure Generate_Reference_To_Generic_Formals (E : Entity_Id);
|
|
|
735 -- Add a reference to the definition of each generic formal on the line
|
|
|
736 -- for a generic unit.
|
|
|
737
|
|
|
738 procedure Output_References;
|
|
|
739 -- Output references to the current ali file
|
|
|
740
|
|
|
741 procedure Initialize;
|
|
|
742 -- Initialize internal tables
|
|
|
743
|
|
|
744 end Lib.Xref;
|
