debug/pcprofiledump.c

   1 /* Dump information generated by PC profiling.
   2    Copyright (C) 1999, 2002 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 /* This is mainly an example.  It shows how programs which want to use
  22    the information should read the file.  */
  23 #ifdef HAVE_CONFIG_H
  24 # include <config.h>
  25 #endif
  26
  27 #include <argp.h>
  28 #include <byteswap.h>
  29 #include <errno.h>
  30 #include <error.h>
  31 #include <fcntl.h>
  32 #include <inttypes.h>
  33 #include <libintl.h>
  34 #include <stdlib.h>
  35 #include <string.h>
  36 #include <unistd.h>
  37
  38 #include "../version.h"
  39
  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 /* Data structure to communicate with argp functions.  */
  69 static struct argp argp =
  70 {
  71   options, parse_opt, args_doc, doc, NULL, more_help
  72 };
  73
  74
  75 int
  76 main (int argc, char *argv[])
  77 {
  78   int fd;
  79   int remaining;
  80   int must_swap;
  81   uint32_t word;
  82
  83   /* Parse and process arguments.  */
  84   argp_parse (&argp, argc, argv, 0, &remaining, NULL);
  85
  86   if (remaining == argc)
  87     fd = STDIN_FILENO;
  88   else if (remaining + 1 != argc)
  89     {
  90       argp_help (&argp, stdout, ARGP_HELP_SEE | ARGP_HELP_EXIT_ERR,
  91                  program_invocation_short_name);
  92       exit (1);
  93     }
  94   else
  95     {
  96       /* Open the given file.  */
  97       fd = open (argv[remaining], O_RDONLY);
  98
  99       if (fd == -1)
 100         error (EXIT_FAILURE, errno, _("cannot open input file"));
 101     }
 102
 103   /* Read the first 4-byte word.  It contains the information about
 104      the word size and the endianess.  */
 105   if (TEMP_FAILURE_RETRY (read (fd, &word, 4)) != 4)
 106     error (EXIT_FAILURE, errno, _("cannot read header"));
 107
 108   /* Check whether we have to swap the byte order.  */
 109   must_swap = (word & 0xfffffff0) == bswap_32 (0xdeb00000);
 110   if (must_swap)
 111     word = bswap_32 (word);
 112
 113   /* We have two loops, one for 32 bit pointers, one for 64 bit pointers.  */
 114   if (word == 0xdeb00004)
 115     {
 116       union
 117       {
 118         uint32_t ptrs[2];
 119         char bytes[8];
 120       } pair;
 121
 122       while (1)
 123         {
 124           size_t len = sizeof (pair);
 125           size_t n;
 126
 127           while (len > 0
 128                  && (n = TEMP_FAILURE_RETRY (read (fd, &pair.bytes[8 - len],
 129                                                    len))) != 0)
 130             len -= n;
 131
 132           if (len != 0)
 133             /* Nothing to read.  */
 134             break;
 135
 136           printf ("this = %#010" PRIx32 ", caller = %#010" PRIx32 "\n",
 137                   must_swap ? bswap_32 (pair.ptrs[0]) : pair.ptrs[0],
 138                   must_swap ? bswap_32 (pair.ptrs[1]) : pair.ptrs[1]);
 139         }
 140     }
 141   else if (word == 0xdeb00008)
 142     {
 143       union
 144       {
 145         uint64_t ptrs[2];
 146         char bytes[16];
 147       } pair;
 148
 149       while (1)
 150         {
 151           size_t len = sizeof (pair);
 152           size_t n;
 153
 154           while (len > 0
 155                  && (n = TEMP_FAILURE_RETRY (read (fd, &pair.bytes[8 - len],
 156                                                    len))) != 0)
 157             len -= n;
 158
 159           if (len != 0)
 160             /* Nothing to read.  */
 161             break;
 162
 163           printf ("this = %#018" PRIx64 ", caller = %#018" PRIx64 "\n",
 164                   must_swap ? bswap_64 (pair.ptrs[0]) : pair.ptrs[0],
 165                   must_swap ? bswap_64 (pair.ptrs[1]) : pair.ptrs[1]);
 166         }
 167     }
 168   else
 169     /* This should not happen.  */
 170     error (EXIT_FAILURE, 0, _("invalid pointer size"));
 171
 172   /* Clean up.  */
 173   close (fd);
 174
 175   return 0;
 176 }
 177
 178 static error_t
 179 parse_opt (int key, char *arg, struct argp_state *state)
 180 {
 181   switch (key)
 182     {
 183     case 'u':
 184       setbuf (stdout, NULL);
 185       break;
 186     default:
 187       return ARGP_ERR_UNKNOWN;
 188     }
 189   return 0;
 190 }
 191
 192 static char *
 193 more_help (int key, const char *text, void *input)
 194 {
 195   switch (key)
 196     {
 197     case ARGP_KEY_HELP_EXTRA:
 198       /* We print some extra information.  */
 199       return strdup (gettext ("\
 200 Report bugs using the `glibcbug' script to <bugs@gnu.org>.\n"));
 201     default:
 202       break;
 203     }
 204   return (char *) text;
 205 }