gcc/dbgcnt.c

   1 /* Debug counter for debugging support
   2    Copyright (C) 2006, 2007, 2008, 2009, 2010, 2012
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.
  20
  21 See dbgcnt.def for usage information.  */
  22
  23 #include "config.h"
  24 #include "system.h"
  25 #include "coretypes.h"
  26 #include "diagnostic-core.h"
  27 #include "dumpfile.h"
  28
  29 #include "dbgcnt.h"
  30
  31 struct string2counter_map {
  32   const char *name;
  33   enum debug_counter counter;
  34 };
  35
  36 #define DEBUG_COUNTER(a) { #a , a },
  37
  38 static struct string2counter_map map[debug_counter_number_of_counters] =
  39 {
  40 #include "dbgcnt.def"
  41 };
  42 #undef DEBUG_COUNTER
  43
  44 #define DEBUG_COUNTER(a) UINT_MAX,
  45 static unsigned int limit[debug_counter_number_of_counters] =
  46 {
  47 #include "dbgcnt.def"
  48 };
  49 #undef DEBUG_COUNTER
  50
  51 static unsigned int count[debug_counter_number_of_counters];
  52
  53 bool
  54 dbg_cnt_is_enabled (enum debug_counter index)
  55 {
  56   return count[index] <= limit[index];
  57 }
  58
  59 bool
  60 dbg_cnt (enum debug_counter index)
  61 {
  62   count[index]++;
  63   if (dump_file && count[index] == limit[index])
  64     fprintf (dump_file, "***dbgcnt: limit reached for %s.***\n",
  65              map[index].name);
  66
  67   return dbg_cnt_is_enabled (index);
  68 }
  69
  70
  71 static void
  72 dbg_cnt_set_limit_by_index (enum debug_counter index, int value)
  73 {
  74   limit[index] = value;
  75
  76   fprintf (stderr, "dbg_cnt '%s' set to %d\n", map[index].name, value);
  77 }
  78
  79 static bool
  80 dbg_cnt_set_limit_by_name (const char *name, int len, int value)
  81 {
  82   int i;
  83   for (i = debug_counter_number_of_counters - 1; i >= 0; i--)
  84     if (strncmp (map[i].name, name, len) == 0
  85         && map[i].name[len] == '\0')
  86       break;
  87
  88   if (i < 0)
  89     return false;
  90
  91   dbg_cnt_set_limit_by_index ((enum debug_counter) i, value);
  92   return true;
  93 }
  94
  95
  96 /* Process a single "name:value" pair.
  97    Returns NULL if there's no valid pair is found.
  98    Otherwise returns a pointer to the end of the pair. */
  99
 100 static const char *
 101 dbg_cnt_process_single_pair (const char *arg)
 102 {
 103    const char *colon = strchr (arg, ':');
 104    char *endptr = NULL;
 105    int value;
 106
 107    if (colon == NULL)
 108      return NULL;
 109
 110    value = strtol (colon + 1, &endptr, 10);
 111
 112    if (endptr != NULL && endptr != colon + 1
 113        && dbg_cnt_set_limit_by_name (arg, colon - arg, value))
 114      return endptr;
 115
 116    return NULL;
 117 }
 118
 119 void
 120 dbg_cnt_process_opt (const char *arg)
 121 {
 122    const char *start = arg;
 123    const char *next;
 124    do {
 125      next = dbg_cnt_process_single_pair (arg);
 126      if (next == NULL)
 127        break;
 128    } while (*next == ',' && (arg = next + 1));
 129
 130    if (next == NULL || *next != 0)
 131      {
 132        char *buffer = XALLOCAVEC (char, arg - start + 2);
 133        sprintf (buffer, "%*c", (int)(1 + (arg - start)), '^');
 134        error ("cannot find a valid counter:value pair:");
 135        error ("-fdbg-cnt=%s", start);
 136        error ("          %s", buffer);
 137      }
 138 }
 139
 140 /* Print name, limit and count of all counters.   */
 141
 142 void
 143 dbg_cnt_list_all_counters (void)
 144 {
 145   int i;
 146   printf ("  %-30s %-5s %-5s\n", "counter name",  "limit", "value");
 147   printf ("----------------------------------------------\n");
 148   for (i = 0; i < debug_counter_number_of_counters; i++)
 149     printf ("  %-30s %5d %5u\n",
 150             map[i].name, limit[map[i].counter], count[map[i].counter]);
 151   printf ("\n");
 152 }