debug/pcprofiledump.c

   1 /* Dump information generated by PC profiling.
   2    Copyright (C) 1999-2022 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 /* This is mainly an example.  It shows how programs which want to use
  20    the information should read the file.  */
  21 #ifdef HAVE_CONFIG_H
  22 # include <config.h>
  23 #endif
  24
  25 #include <argp.h>
  26 #include <byteswap.h>
  27 #include <errno.h>
  28 #include <error.h>
  29 #include <fcntl.h>
  30 #include <inttypes.h>
  31 #include <libintl.h>
  32 #include <stdlib.h>
  33 #include <string.h>
  34 #include <unistd.h>
  35 #include <stdint.h>
  36
  37 #include "../version.h"
  38
  39 #define PACKAGE _libc_intl_domainname
  40
  41 #ifndef _
  42 # define _(Str) gettext (Str)
  43 #endif
  44
  45 #ifndef N_
  46 # define N_(Str) Str
  47 #endif
  48
  49 /* Definitions of arguments for argp functions.  */
  50 static const struct argp_option options[] =
  51 {
  52   { "unbuffered", 'u', NULL, 0, N_("Don't buffer output") },
  53   { NULL, 0, NULL, 0, NULL }
  54 };
  55
  56 /* Short description of program.  */
  57 static const char doc[] = N_("Dump information generated by PC profiling.");
  58
  59 /* Strings for arguments in help texts.  */
  60 static const char args_doc[] = N_("[FILE]");
  61
  62 /* Function to print some extra text in the help message.  */
  63 static char *more_help (int key, const char *text, void *input);
  64
  65 /* Prototype for option handler.  */
  66 static error_t parse_opt (int key, char *arg, struct argp_state *state);
  67
  68 /* Name and version of program.  */
  69 static void print_version (FILE *stream, struct argp_state *state);
  70 void (*argp_program_version_hook) (FILE *, struct argp_state *) = print_version;
  71
  72 /* Data structure to communicate with argp functions.  */
  73 static struct argp argp =
  74 {
  75   options, parse_opt, args_doc, doc, NULL, more_help
  76 };
  77
  78
  79 int
  80 main (int argc, char *argv[])
  81 {
  82   /* Set locale via LC_ALL.  */
  83   setlocale (LC_ALL, "");
  84
  85   /* Set the text message domain.  */
  86   textdomain (PACKAGE);
  87
  88   /* Parse and process arguments.  */
  89   int remaining;
  90   argp_parse (&argp, argc, argv, 0, &remaining, NULL);
  91
  92   int fd;
  93   if (remaining == argc)
  94     fd = STDIN_FILENO;
  95   else if (remaining + 1 != argc)
  96     {
  97       argp_help (&argp, stdout, ARGP_HELP_SEE | ARGP_HELP_EXIT_ERR,
  98                  program_invocation_short_name);
  99       exit (1);
 100     }
 101   else
 102     {
 103       /* Open the given file.  */
 104       fd = open (argv[remaining], O_RDONLY);
 105
 106       if (fd == -1)
 107         error (EXIT_FAILURE, errno, _("cannot open input file"));
 108     }
 109
 110   /* Read the first 4-byte word.  It contains the information about
 111      the word size and the endianess.  */
 112   uint32_t word;
 113   if (TEMP_FAILURE_RETRY (read (fd, &word, 4)) != 4)
 114     error (EXIT_FAILURE, errno, _("cannot read header"));
 115
 116   /* Check whether we have to swap the byte order.  */
 117   int must_swap = (word & 0x0fffffff) == bswap_32 (0xdeb00000);
 118   if (must_swap)
 119     word = bswap_32 (word);
 120
 121   /* We have two loops, one for 32 bit pointers, one for 64 bit pointers.  */
 122   if (word == 0xdeb00004)
 123     {
 124       union
 125       {
 126         uint32_t ptrs[2];
 127         char bytes[8];
 128       } pair;
 129
 130       while (1)
 131         {
 132           size_t len = sizeof (pair);
 133           size_t n;
 134
 135           while (len > 0
 136                  && (n = TEMP_FAILURE_RETRY (read (fd, &pair.bytes[8 - len],
 137                                                    len))) != 0)
 138             len -= n;
 139
 140           if (len != 0)
 141             /* Nothing to read.  */
 142             break;
 143
 144           printf ("this = %#010" PRIx32 ", caller = %#010" PRIx32 "\n",
 145                   must_swap ? bswap_32 (pair.ptrs[0]) : pair.ptrs[0],
 146                   must_swap ? bswap_32 (pair.ptrs[1]) : pair.ptrs[1]);
 147         }
 148     }
 149   else if (word == 0xdeb00008)
 150     {
 151       union
 152       {
 153         uint64_t ptrs[2];
 154         char bytes[16];
 155       } pair;
 156
 157       while (1)
 158         {
 159           size_t len = sizeof (pair);
 160           size_t n;
 161
 162           while (len > 0
 163                  && (n = TEMP_FAILURE_RETRY (read (fd, &pair.bytes[8 - len],
 164                                                    len))) != 0)
 165             len -= n;
 166
 167           if (len != 0)
 168             /* Nothing to read.  */
 169             break;
 170
 171           printf ("this = %#018" PRIx64 ", caller = %#018" PRIx64 "\n",
 172                   must_swap ? bswap_64 (pair.ptrs[0]) : pair.ptrs[0],
 173                   must_swap ? bswap_64 (pair.ptrs[1]) : pair.ptrs[1]);
 174         }
 175     }
 176   else
 177     /* This should not happen.  */
 178     error (EXIT_FAILURE, 0, _("invalid pointer size"));
 179
 180   /* Clean up.  */
 181   close (fd);
 182
 183   return 0;
 184 }
 185
 186 static error_t
 187 parse_opt (int key, char *arg, struct argp_state *state)
 188 {
 189   switch (key)
 190     {
 191     case 'u':
 192       setbuf (stdout, NULL);
 193       break;
 194     default:
 195       return ARGP_ERR_UNKNOWN;
 196     }
 197   return 0;
 198 }
 199
 200 static char *
 201 more_help (int key, const char *text, void *input)
 202 {
 203   char *tp = NULL;
 204   switch (key)
 205     {
 206     case ARGP_KEY_HELP_EXTRA:
 207       /* We print some extra information.  */
 208       if (asprintf (&tp, gettext ("\
 209 For bug reporting instructions, please see:\n\
 210 %s.\n"), REPORT_BUGS_TO) < 0)
 211         return NULL;
 212       return tp;
 213     default:
 214       break;
 215     }
 216   return (char *) text;
 217 }
 218
 219 /* Print the version information.  */
 220 static void
 221 print_version (FILE *stream, struct argp_state *state)
 222 {
 223   fprintf (stream, "pcprofiledump %s%s\n", PKGVERSION, VERSION);
 224   fprintf (stream, gettext ("\
 225 Copyright (C) %s Free Software Foundation, Inc.\n\
 226 This is free software; see the source for copying conditions.  There is NO\n\
 227 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\
 228 "), "2022");
 229   fprintf (stream, gettext ("Written by %s.\n"), "Ulrich Drepper");
 230 }