gcc/dbgcnt.c

   1 /* Debug counter for debugging support
   2    Copyright (C) 2006, 2007, 2008, 2009, 2010 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 "diagnostic-core.h"
  26 #include "toplev.h"
  27 #include "tm.h"
  28 #include "rtl.h"
  29 #include "output.h"
  30
  31 #include "dbgcnt.h"
  32
  33 struct string2counter_map {
  34   const char *name;
  35   enum debug_counter counter;
  36 };
  37
  38 #define DEBUG_COUNTER(a) { #a , a },
  39
  40 static struct string2counter_map map[debug_counter_number_of_counters] =
  41 {
  42 #include "dbgcnt.def"
  43 };
  44 #undef DEBUG_COUNTER
  45
  46 #define DEBUG_COUNTER(a) UINT_MAX,
  47 static unsigned int limit[debug_counter_number_of_counters] =
  48 {
  49 #include "dbgcnt.def"
  50 };
  51 #undef DEBUG_COUNTER
  52
  53 static unsigned int count[debug_counter_number_of_counters];
  54
  55 bool
  56 dbg_cnt_is_enabled (enum debug_counter index)
  57 {
  58   return count[index] <= limit[index];
  59 }
  60
  61 bool
  62 dbg_cnt (enum debug_counter index)
  63 {
  64   count[index]++;
  65   if (dump_file && count[index] == limit[index])
  66     fprintf (dump_file, "***dbgcnt: limit reached for %s.***\n",
  67              map[index].name);
  68
  69   return dbg_cnt_is_enabled (index);
  70 }
  71
  72
  73 static void
  74 dbg_cnt_set_limit_by_index (enum debug_counter index, int value)
  75 {
  76   limit[index] = value;
  77
  78   fprintf (stderr, "dbg_cnt '%s' set to %d\n", map[index].name, value);
  79 }
  80
  81 static bool
  82 dbg_cnt_set_limit_by_name (const char *name, int len, int value)
  83 {
  84   int i;
  85   for (i = debug_counter_number_of_counters - 1; i >= 0; i--)
  86     if (strncmp (map[i].name, name, len) == 0
  87         && map[i].name[len] == '\0')
  88       break;
  89
  90   if (i < 0)
  91     return false;
  92
  93   dbg_cnt_set_limit_by_index ((enum debug_counter) i, value);
  94   return true;
  95 }
  96
  97
  98 /* Process a single "name:value" pair.
  99    Returns NULL if there's no valid pair is found.
 100    Otherwise returns a pointer to the end of the pair. */
 101
 102 static const char *
 103 dbg_cnt_process_single_pair (const char *arg)
 104 {
 105    const char *colon = strchr (arg, ':');
 106    char *endptr = NULL;
 107    int value;
 108
 109    if (colon == NULL)
 110      return NULL;
 111
 112    value = strtol (colon + 1, &endptr, 10);
 113
 114    if (endptr != NULL && endptr != colon + 1
 115        && dbg_cnt_set_limit_by_name (arg, colon - arg, value))
 116      return endptr;
 117
 118    return NULL;
 119 }
 120
 121 void
 122 dbg_cnt_process_opt (const char *arg)
 123 {
 124    const char *start = arg;
 125    const char *next;
 126    do {
 127      next = dbg_cnt_process_single_pair (arg);
 128      if (next == NULL)
 129        break;
 130    } while (*next == ',' && (arg = next + 1));
 131
 132    if (next == NULL || *next != 0)
 133      {
 134        char *buffer = XALLOCAVEC (char, arg - start + 2);
 135        sprintf (buffer, "%*c", (int)(1 + (arg - start)), '^');
 136        error ("Can not find a valid counter:value pair:");
 137        error ("-fdbg-cnt=%s", start);
 138        error ("          %s", buffer);
 139      }
 140 }
 141
 142 /* Print name, limit and count of all counters.   */
 143
 144 void
 145 dbg_cnt_list_all_counters (void)
 146 {
 147   int i;
 148   printf ("  %-30s %-5s %-5s\n", "counter name",  "limit", "value");
 149   printf ("----------------------------------------------\n");
 150   for (i = 0; i < debug_counter_number_of_counters; i++)
 151     printf ("  %-30s %5d %5u\n",
 152             map[i].name, limit[map[i].counter], count[map[i].counter]);
 153   printf ("\n");
 154 }