libcpp/location-example.txt

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