gcc/dbgcnt.c

   1 /* Debug counter for debugging support
   2    Copyright (C) 2006, 2007 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.
  19
  20 See dbgcnt.def for usage information.  */
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "errors.h"
  26
  27 #include "dbgcnt.h"
  28
  29 struct string2counter_map {
  30   const char *name;
  31   enum debug_counter counter;
  32 };
  33
  34 #define DEBUG_COUNTER(a) { #a , a },
  35
  36 static struct string2counter_map map[debug_counter_number_of_counters] =
  37 {
  38 #include "dbgcnt.def"
  39 };
  40 #undef DEBUG_COUNTER
  41
  42 #define DEBUG_COUNTER(a) UINT_MAX,
  43 static unsigned int limit[debug_counter_number_of_counters] =
  44 {
  45 #include "dbgcnt.def"
  46 };
  47 #undef DEBUG_COUNTER
  48
  49 static unsigned int count[debug_counter_number_of_counters];
  50
  51 bool
  52 dbg_cnt_is_enabled (enum debug_counter index)
  53 {
  54   return count[index] <= limit[index];
  55 }
  56
  57 bool
  58 dbg_cnt (enum debug_counter index)
  59 {
  60   count[index]++;
  61   return dbg_cnt_is_enabled (index);
  62 }
  63
  64
  65 static void
  66 dbg_cnt_set_limit_by_index (enum debug_counter index, int value)
  67 {
  68   limit[index] = value;
  69
  70   fprintf (stderr, "dbg_cnt '%s' set to %d\n", map[index].name, value);
  71 }
  72
  73 static bool
  74 dbg_cnt_set_limit_by_name (const char *name, int len, int value)
  75 {
  76   int i;
  77   for (i = debug_counter_number_of_counters - 1; i >= 0; i--)
  78     if (!strncmp (map[i].name, name, len))
  79       break;
  80
  81   if (i < 0)
  82     return false;
  83
  84   dbg_cnt_set_limit_by_index (i, value);
  85   return true;
  86 }
  87
  88
  89 /* Process a single "name:value" pair.
  90    Returns NULL if there's no valid pair is found.
  91    Otherwise returns a pointer to the end of the pair. */
  92
  93 static const char *
  94 dbg_cnt_process_single_pair (const char *arg)
  95 {
  96    char *colon = strchr (arg, ':');
  97    char *endptr = NULL;
  98    int value;
  99
 100    if (colon == NULL)
 101      return NULL;
 102
 103    value = strtol (colon + 1, &endptr, 10);
 104
 105    if (endptr != NULL && endptr != colon + 1
 106        && dbg_cnt_set_limit_by_name (arg, colon - arg, value))
 107      return endptr;
 108
 109    return NULL;
 110 }
 111
 112 void
 113 dbg_cnt_process_opt (const char *arg)
 114 {
 115    const char *start = arg;
 116    const char *next;
 117    do {
 118      next = dbg_cnt_process_single_pair (arg);
 119      if (next == NULL)
 120        break;
 121    } while (*next == ',' && (arg = next + 1));
 122
 123    if (next == NULL || *next != 0)
 124      {
 125        char *buffer = alloca (arg - start + 2);
 126        sprintf (buffer, "%*c", (int)(1 + (arg - start)), '^');
 127        error ("Can not find a valid counter:value pair:");
 128        error ("-fdbg-cnt=%s", start);
 129        error ("          %s", buffer);
 130      }
 131 }
 132
 133 /* Print name, limit and count of all counters.   */
 134
 135 void dbg_cnt_list_all_counters (void)
 136 {
 137   int i;
 138   printf ("  %-30s %-5s %-5s\n", "counter name",  "limit", "value");
 139   printf ("----------------------------------------------\n");
 140   for (i = 0; i < debug_counter_number_of_counters; i++)
 141     printf ("  %-30s %5d %5u\n",
 142             map[i].name, limit[map[i].counter], count[map[i].counter]);
 143   printf ("\n");
 144 }