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1 Consider compiling test.c, with this content:
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2 VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV
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3 #include "test.h"
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4
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5 int
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6 main (int argc, char **argv)
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7 {
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8 int a = PLUS (1,2);
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9 int b = PLUS (3,4);
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10 return 0;
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11 }
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12 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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13
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14 ...where test.h has this content:
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15 VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV
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16 extern int foo ();
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17
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18 #define PLUS(A, B) A + B
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19 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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20
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21
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22 The undocumented -fdump-internal-locations option outputs this information
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23 to stderr, showing what each location_t value means. Source code
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24 lines are quoted, showing both per-line location_t values and
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25 per-line&column location_t values (written vertically under the
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26 corresponding character of source code).
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27
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28 VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV
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29 RESERVED LOCATIONS
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30 location_t interval: 0 <= loc < 2
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31
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32 ORDINARY MAP: 0
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33 location_t interval: 32 <= loc < 64
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34 file: test.c
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35 starting at line: 1
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36 column and range bits: 12
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37 column bits: 7
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38 range bits: 5
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39 reason: 0 (LC_ENTER)
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40 included from location: 0
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41 test.c: 1|loc: 32|#include "test.h"
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42 |69269258258148147
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43 |46802468024680246
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44
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45 ORDINARY MAP: 1
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46 location_t interval: 64 <= loc < 96
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47 file: <built-in>
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48 starting at line: 0
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49 column and range bits: 0
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50 column bits: 0
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51 range bits: 0
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52 reason: 2 (LC_RENAME)
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53 included from location: 0
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54
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55 ORDINARY MAP: 2
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56 location_t interval: 96 <= loc < 128
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57 file: <command-line>
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58 starting at line: 0
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59 column and range bits: 0
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60 column bits: 0
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61 range bits: 0
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62 reason: 2 (LC_RENAME)
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63 included from location: 0
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64
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65 ORDINARY MAP: 3
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66 location_t interval: 128 <= loc < 250240
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67 file: /usr/include/stdc-predef.h
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68 starting at line: 1
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69 column and range bits: 12
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70 column bits: 7
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71 range bits: 5
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72 reason: 0 (LC_ENTER)
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73 included from location: 127 (in ordinary map 2)
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74 (contents of /usr/include/stdc-predef.h snipped for brevity)
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75
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76 ORDINARY MAP: 4
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77 location_t interval: 250240 <= loc < 250272
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78 file: <command-line>
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79 starting at line: 32
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80 column and range bits: 12
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81 column bits: 7
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82 range bits: 5
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83 reason: 1 (LC_LEAVE)
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84 included from location: 0
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85
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86 ORDINARY MAP: 5
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87 location_t interval: 250272 <= loc < 254368
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88 file: test.c
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89 starting at line: 1
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90 column and range bits: 12
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91 column bits: 7
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92 range bits: 5
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93 reason: 2 (LC_RENAME)
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94 included from location: 0
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95 test.c: 1|loc:250272|#include "test.h"
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96 |00000000000000000
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97 |33344445556667778
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98 |03603692692582581
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99 |46802468024680246
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100
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101 ORDINARY MAP: 6
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102 location_t interval: 254368 <= loc < 266720
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103 file: test.h
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104 starting at line: 1
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105 column and range bits: 12
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106 column bits: 7
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107 range bits: 5
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108 reason: 0 (LC_ENTER)
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109 included from location: 250272 (in ordinary map 5)
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110 test.h: 1|loc:254368|extern int foo ();
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111 |444444444444444444
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112 |444455566677788899
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113 |036926925825814814
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114 |024680246802468024
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115 test.h: 2|loc:258464|
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116 |
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117 |
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118 |
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119 |
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120 test.h: 3|loc:262560|#define PLUS(A, B) A + B
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121 |222222222222233333333333
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122 |566677788899900011122223
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123 |925825814814704703603692
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124 |246802468024680246802468
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125 test.h: 4|loc:266656|
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126 |
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127 |
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128 |
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129 |
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130
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131 ORDINARY MAP: 7
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132 location_t interval: 266720 <= loc < 299520
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133 file: test.c
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134 starting at line: 2
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135 column and range bits: 12
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136 column bits: 7
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137 range bits: 5
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138 reason: 1 (LC_LEAVE)
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139 included from location: 0
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140 test.c: 2|loc:266720|
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141 |
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142 |
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143 |
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144 |
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145 test.c: 3|loc:270816|int
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146 |000
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147 |889
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148 |481
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149 |802
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150 test.c: 4|loc:274912|main (int argc, char **argv)
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151 |4455555555555555555555555555
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152 |9900011122223334445556667778
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153 |4704703603692692582581481470
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154 |4680246802468024680246802468
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155 test.c: 5|loc:279008|{
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156 |9
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157 |0
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158 |4
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159 |0
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160 test.c: 6|loc:283104| int a = PLUS (1,2);
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161 |333333333333333333333
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162 |112222333444555666777
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163 |360369269258258148147
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164 |680246802468024680246
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165 test.c: 7|loc:287200| int b = PLUS (3,4);
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166 |777777777777777777777
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167 |222333444555666777888
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168 |369269258258148147047
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169 |246802468024680246802
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170 test.c: 8|loc:291296| return 0;
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171 |11111111111
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172 |33344455566
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173 |26925825814
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174 |80246802468
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175 test.c: 9|loc:295392|}
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176 |5
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177 |4
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178 |2
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179 |4
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180 test.c: 10|loc:299488|
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181 |
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182 |
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183 |
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184 |
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185
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186 UNALLOCATED LOCATIONS
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187 location_t interval: 299520 <= loc < 2147483632
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188
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189 MACRO 3: PLUS (7 tokens)
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190 location_t interval: 2147483632 <= loc < 2147483639
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191 test.c:7:11: note: expansion point is location 287555
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192 7 | int b = PLUS (3,4);
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193 | ^~~~
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194 map->start_location: 2147483632
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195 macro_locations:
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196 0: 287744, 263200
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197 test.c:7:17: note: token 0 has x-location == 287744
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198 7 | int b = PLUS (3,4);
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199 | ^
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200 test.c:7:17: note: token 0 has y-location == 263200
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201 1: 263264, 263264
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202 In file included from test.c:1:
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203 test.h:3:22: note: token 1 has x-location == y-location == 263264
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204 3 | #define PLUS(A, B) A + B
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205 | ^
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206 2: 287808, 263328
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207 test.c:7:19: note: token 2 has x-location == 287808
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208 7 | int b = PLUS (3,4);
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209 | ^
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210 test.c:7:19: note: token 2 has y-location == 263328
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211 3: 0, 0
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212 cc1: note: token 3 has x-location == y-location == 0
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213 4: 0, 0
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214 cc1: note: token 4 has x-location == y-location == 0
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215 5: 0, 0
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216 cc1: note: token 5 has x-location == y-location == 0
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217 6: 0, 0
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218 cc1: note: token 6 has x-location == y-location == 0
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219
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220 MACRO 2: PLUS (7 tokens)
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221 location_t interval: 2147483639 <= loc < 2147483646
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222 test.c:6:11: note: expansion point is location 283459
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223 6 | int a = PLUS (1,2);
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224 | ^~~~
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225 map->start_location: 2147483639
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226 macro_locations:
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227 0: 283648, 263200
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228 test.c:6:17: note: token 0 has x-location == 283648
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229 6 | int a = PLUS (1,2);
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230 | ^
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231 test.c:6:17: note: token 0 has y-location == 263200
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232 1: 263264, 263264
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233 In file included from test.c:1:
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234 test.h:3:22: note: token 1 has x-location == y-location == 263264
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235 3 | #define PLUS(A, B) A + B
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236 | ^
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237 2: 283712, 263328
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238 test.c:6:19: note: token 2 has x-location == 283712
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239 6 | int a = PLUS (1,2);
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240 | ^
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241 test.c:6:19: note: token 2 has y-location == 263328
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242 3: 0, 0
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243 cc1: note: token 3 has x-location == y-location == 0
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244 4: 0, 0
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245 cc1: note: token 4 has x-location == y-location == 0
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246 5: 0, 0
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247 cc1: note: token 5 has x-location == y-location == 0
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248 6: 0, 0
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249 cc1: note: token 6 has x-location == y-location == 0
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250
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251 MACRO 1: __GCC_IEC_559_COMPLEX (1 tokens)
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252 location_t interval: 2147483646 <= loc < 2147483647
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253 In file included from <command-line>:31:
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254 /usr/include/stdc-predef.h:45:6: note: expansion point is location 180564
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255 45 | # if __GCC_IEC_559_COMPLEX > 0
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256 | ^~~~~~~~~~~~~~~~~~~~~
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257 map->start_location: 2147483646
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258 macro_locations:
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259 0: 1, 1
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260 <built-in>: note: token 0 has x-location == y-location == 1
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261
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262 MACRO 0: __GCC_IEC_559 (1 tokens)
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263 location_t interval: 2147483647 <= loc < 2147483648
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264 /usr/include/stdc-predef.h:37:6: note: expansion point is location 147788
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265 37 | # if __GCC_IEC_559 > 0
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266 | ^~~~~~~~~~~~~
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267 map->start_location: 2147483647
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268 macro_locations:
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269 0: 1, 1
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270 <built-in>: note: token 0 has x-location == y-location == 1
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271
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272 MAX_LOCATION_T
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273 location_t interval: 2147483647 <= loc < 2147483648
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274
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275 AD-HOC LOCATIONS
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276 location_t interval: 2147483648 <= loc < 4294967295
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277 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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