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: 2 <= loc < 3
  34   file: test.c
  35   starting at line: 1
  36   column bits: 7
  37 test.c:  1|loc:    2|#include "test.h"
  38                     |00000001111111111
  39                     |34567890123456789
  40
  41 ORDINARY MAP: 1
  42   source_location interval: 3 <= loc < 4
  43   file: <built-in>
  44   starting at line: 0
  45   column bits: 0
  46
  47 ORDINARY MAP: 2
  48   source_location interval: 4 <= loc < 5
  49   file: <command-line>
  50   starting at line: 0
  51   column bits: 0
  52
  53 ORDINARY MAP: 3
  54   source_location interval: 5 <= loc < 5005
  55   file: /usr/include/stdc-predef.h
  56   starting at line: 1
  57   column bits: 7
  58 (contents of /usr/include/stdc-predef.h snipped for brevity)
  59
  60 ORDINARY MAP: 4
  61   source_location interval: 5005 <= loc < 5006
  62   file: <command-line>
  63   starting at line: 1
  64   column bits: 7
  65
  66 ORDINARY MAP: 5
  67   source_location interval: 5006 <= loc < 5134
  68   file: test.c
  69   starting at line: 1
  70   column bits: 7
  71 test.c:  1|loc: 5006|#include "test.h"
  72                     |55555555555555555
  73                     |00000000000000000
  74                     |00011111111112222
  75                     |78901234567890123
  76
  77 ORDINARY MAP: 6
  78   source_location interval: 5134 <= loc < 5416
  79   file: test.h
  80   starting at line: 1
  81   column bits: 7
  82 test.h:  1|loc: 5134|extern int foo ();
  83                     |555555555555555555
  84                     |111111111111111111
  85                     |333334444444444555
  86                     |567890123456789012
  87 test.h:  2|loc: 5262|
  88                     |
  89                     |
  90                     |
  91                     |
  92 test.h:  3|loc: 5390|#define PLUS(A, B) A + B
  93                     |555555555555555555555555
  94                     |333333333444444444444444
  95                     |999999999000000000011111
  96                     |123456789012345678901234
  97
  98 ORDINARY MAP: 7
  99   source_location interval: 5416 <= loc < 6314
 100   file: test.c
 101   starting at line: 2
 102   column bits: 7
 103 test.c:  2|loc: 5416|
 104                     |
 105                     |
 106                     |
 107                     |
 108 test.c:  3|loc: 5544|int
 109                     |555
 110                     |555
 111                     |444
 112                     |567
 113 test.c:  4|loc: 5672|main (int argc, char **argv)
 114                     |5555555555555555555555555555
 115                     |6666666666666666666666666667
 116                     |7777777888888888899999999990
 117                     |3456789012345678901234567890
 118 test.c:  5|loc: 5800|{
 119                     |5
 120                     |8
 121                     |0
 122                     |1
 123 test.c:  6|loc: 5928|  int a = PLUS (1,2);
 124                     |555555555555555555555
 125                     |999999999999999999999
 126                     |233333333334444444444
 127                     |901234567890123456789
 128 test.c:  7|loc: 6056|  int b = PLUS (3,4);
 129                     |666666666666666666666
 130                     |000000000000000000000
 131                     |555666666666677777777
 132                     |789012345678901234567
 133 test.c:  8|loc: 6184|  return 0;
 134                     |66666666666
 135                     |11111111111
 136                     |88888999999
 137                     |56789012345
 138 test.c:  9|loc: 6312|}
 139                     |6
 140                     |3
 141                     |1
 142                     |3
 143
 144 UNALLOCATED LOCATIONS
 145   source_location interval: 6314 <= loc < 2147483633
 146
 147 MACRO 1: PLUS (7 tokens)
 148   source_location interval: 2147483633 <= loc < 2147483640
 149 test.c:7:11: note: expansion point is location 6067
 150    int b = PLUS (3,4);
 151            ^
 152   map->start_location: 2147483633
 153   macro_locations:
 154     0: 6073, 5410
 155 test.c:7:17: note: token 0 has x-location == 6073
 156    int b = PLUS (3,4);
 157                  ^
 158 test.c:7:17: note: token 0 has y-location == 5410
 159     1: 5412, 5412
 160 In file included from test.c:1:0:
 161 test.h:3:22: note: token 1 has x-location == y-location == 5412
 162  #define PLUS(A, B) A + B
 163                       ^
 164     2: 6075, 5414
 165 test.c:7:19: note: token 2 has x-location == 6075
 166    int b = PLUS (3,4);
 167                    ^
 168 test.c:7:19: note: token 2 has y-location == 5414
 169     3: 0, 2947526575
 170 cc1: note: token 3 has x-location == 0
 171 cc1: note: token 3 has y-location == 2947526575
 172     4: 2947526575, 2947526575
 173 x-location == y-location == 2947526575 encodes token # 800042942
 174     5: 2947526575, 2947526575
 175 x-location == y-location == 2947526575 encodes token # 800042942
 176     6: 2947526575, 2947526575
 177 x-location == y-location == 2947526575 encodes token # 800042942
 178
 179 MACRO 0: PLUS (7 tokens)
 180   source_location interval: 2147483640 <= loc < 2147483647
 181 test.c:6:11: note: expansion point is location 5939
 182    int a = PLUS (1,2);
 183            ^
 184   map->start_location: 2147483640
 185   macro_locations:
 186     0: 5945, 5410
 187 test.c:6:17: note: token 0 has x-location == 5945
 188    int a = PLUS (1,2);
 189                  ^
 190 test.c:6:17: note: token 0 has y-location == 5410
 191     1: 5412, 5412
 192 In file included from test.c:1:0:
 193 test.h:3:22: note: token 1 has x-location == y-location == 5412
 194  #define PLUS(A, B) A + B
 195                       ^
 196     2: 5947, 5414
 197 test.c:6:19: note: token 2 has x-location == 5947
 198    int a = PLUS (1,2);
 199                    ^
 200 test.c:6:19: note: token 2 has y-location == 5414
 201     3: 0, 2947526575
 202 cc1: note: token 3 has x-location == 0
 203 cc1: note: token 3 has y-location == 2947526575
 204     4: 2947526575, 2947526575
 205 x-location == y-location == 2947526575 encodes token # 800042935
 206     5: 2947526575, 2947526575
 207 x-location == y-location == 2947526575 encodes token # 800042935
 208     6: 2947526575, 2947526575
 209 x-location == y-location == 2947526575 encodes token # 800042935
 210
 211 MAX_SOURCE_LOCATION
 212   source_location interval: 2147483647 <= loc < 2147483648
 213
 214 AD-HOC LOCATIONS
 215   source_location interval: 2147483648 <= loc < 4294967295
 216 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^