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 source_location value means.  Source code
  24 lines are quoted, showing both per-line source_location values and
  25 per-line&column source_location values (written vertically under the
  26 corresponding character of source code).
  27
  28 VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV
  29 RESERVED LOCATIONS
  30   source_location interval: 0 <= loc < 2
  31
  32 ORDINARY MAP: 0
  33   source_location interval: 32 <= loc < 64
  34   file: test.c
  35   starting at line: 1
  36   column bits: 12
  37   range bits: 5
  38 test.c:  1|loc:   32|#include "test.h"
  39                     |69269258258148147
  40                     |46802468024680246
  41
  42 ORDINARY MAP: 1
  43   source_location interval: 64 <= loc < 96
  44   file: <built-in>
  45   starting at line: 0
  46   column bits: 0
  47   range bits: 0
  48
  49 ORDINARY MAP: 2
  50   source_location interval: 96 <= loc < 128
  51   file: <command-line>
  52   starting at line: 0
  53   column bits: 0
  54   range bits: 0
  55
  56 ORDINARY MAP: 3
  57   source_location interval: 128 <= loc < 160128
  58   file: /usr/include/stdc-predef.h
  59   starting at line: 1
  60   column bits: 12
  61   range bits: 5
  62 (contents of /usr/include/stdc-predef.h snipped for brevity)
  63
  64 ORDINARY MAP: 4
  65   source_location interval: 160128 <= loc < 160160
  66   file: <command-line>
  67   starting at line: 32
  68   column bits: 12
  69   range bits: 5
  70
  71 ORDINARY MAP: 5
  72   source_location interval: 160160 <= loc < 164256
  73   file: test.c
  74   starting at line: 1
  75   column bits: 12
  76   range bits: 5
  77 test.c:  1|loc:160160|#include "test.h"
  78                     |00000000000000000
  79                     |12223334445556667
  80                     |92582581481470470
  81                     |24680246802468024
  82
  83 ORDINARY MAP: 6
  84   source_location interval: 164256 <= loc < 173280
  85   file: test.h
  86   starting at line: 1
  87   column bits: 12
  88   range bits: 5
  89 test.h:  1|loc:164256|extern int foo ();
  90                     |444444444444444444
  91                     |233344455566677788
  92                     |825814814704703603
  93                     |802468024680246802
  94 test.h:  2|loc:168352|
  95                     |
  96                     |
  97                     |
  98                     |
  99 test.h:  3|loc:172448|#define PLUS(A, B) A + B
 100                     |222222222222222223333333
 101                     |455566677788889990001112
 102                     |814704703603692692582581
 103                     |024680246802468024680246
 104
 105 ORDINARY MAP: 7
 106   source_location interval: 173280 <= loc < 202016
 107   file: test.c
 108   starting at line: 2
 109   column bits: 12
 110   range bits: 5
 111 test.c:  2|loc:173280|
 112                     |
 113                     |
 114                     |
 115                     |
 116 test.c:  3|loc:177376|int
 117                     |777
 118                     |444
 119                     |047
 120                     |802
 121 test.c:  4|loc:181472|main (int argc, char **argv)
 122                     |1111111111111111222222222222
 123                     |5556666777888999000111222333
 124                     |0360369269258258148147047036
 125                     |4680246802468024680246802468
 126 test.c:  5|loc:185568|{
 127                     |5
 128                     |6
 129                     |0
 130                     |0
 131 test.c:  6|loc:189664|  int a = PLUS (1,2);
 132                     |999999999900000000000
 133                     |677788899900011122233
 134                     |926925825814814704703
 135                     |680246802468024680246
 136 test.c:  7|loc:193760|  int b = PLUS (3,4);
 137                     |333333344444444444444
 138                     |788899900011122233344
 139                     |925825814814704703603
 140                     |246802468024680246802
 141 test.c:  8|loc:197856|  return 0;
 142                     |77778888888
 143                     |89990001112
 144                     |82581481470
 145                     |80246802468
 146 test.c:  9|loc:201952|}
 147                     |1
 148                     |9
 149                     |8
 150                     |4
 151
 152 UNALLOCATED LOCATIONS
 153   source_location interval: 202016 <= loc < 2147483633
 154
 155 MACRO 1: PLUS (7 tokens)
 156   source_location interval: 2147483633 <= loc < 2147483640
 157 test.c:7:11: note: expansion point is location 194115
 158    int b = PLUS (3,4);
 159            ^~~~
 160
 161   map->start_location: 2147483633
 162   macro_locations:
 163     0: 194304, 173088
 164 test.c:7:17: note: token 0 has x-location == 194304
 165    int b = PLUS (3,4);
 166                  ^
 167
 168 test.c:7:17: note: token 0 has y-location == 173088
 169     1: 173152, 173152
 170 In file included from test.c:1:0:
 171 test.h:3:22: note: token 1 has x-location == y-location == 173152
 172  #define PLUS(A, B) A + B
 173                       ^
 174
 175     2: 194368, 173216
 176 test.c:7:19: note: token 2 has x-location == 194368
 177    int b = PLUS (3,4);
 178                    ^
 179
 180 test.c:7:19: note: token 2 has y-location == 173216
 181     3: 0, 2947526575
 182 cc1: note: token 3 has x-location == 0
 183 cc1: note: token 3 has y-location == 2947526575
 184     4: 2947526575, 2947526575
 185 x-location == y-location == 2947526575 encodes token # 800042942
 186     5: 2947526575, 2947526575
 187 x-location == y-location == 2947526575 encodes token # 800042942
 188     6: 2947526575, 2947526575
 189 x-location == y-location == 2947526575 encodes token # 800042942
 190
 191 MACRO 0: PLUS (7 tokens)
 192   source_location interval: 2147483640 <= loc < 2147483647
 193 test.c:6:11: note: expansion point is location 190019
 194    int a = PLUS (1,2);
 195            ^~~~
 196
 197   map->start_location: 2147483640
 198   macro_locations:
 199     0: 190208, 173088
 200 test.c:6:17: note: token 0 has x-location == 190208
 201    int a = PLUS (1,2);
 202                  ^
 203
 204 test.c:6:17: note: token 0 has y-location == 173088
 205     1: 173152, 173152
 206 In file included from test.c:1:0:
 207 test.h:3:22: note: token 1 has x-location == y-location == 173152
 208  #define PLUS(A, B) A + B
 209                       ^
 210
 211     2: 190272, 173216
 212 test.c:6:19: note: token 2 has x-location == 190272
 213    int a = PLUS (1,2);
 214                    ^
 215
 216 test.c:6:19: note: token 2 has y-location == 173216
 217     3: 0, 2947526575
 218 cc1: note: token 3 has x-location == 0
 219 cc1: note: token 3 has y-location == 2947526575
 220     4: 2947526575, 2947526575
 221 x-location == y-location == 2947526575 encodes token # 800042935
 222     5: 2947526575, 2947526575
 223 x-location == y-location == 2947526575 encodes token # 800042935
 224     6: 2947526575, 2947526575
 225 x-location == y-location == 2947526575 encodes token # 800042935
 226
 227 MAX_SOURCE_LOCATION
 228   source_location interval: 2147483647 <= loc < 2147483648
 229
 230 AD-HOC LOCATIONS
 231   source_location interval: 2147483648 <= loc < 4294967295
 232 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^