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 2, 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 COPYING.  If not, write to the Free
  18 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301, USA.
  20
  21 See dbgcnt.def for usage information.  */
  22
  23 #include "config.h"
  24 #include "system.h"
  25 #include "coretypes.h"
  26 #include "errors.h"
  27
  28 #include "dbgcnt.h"
  29
  30 struct string2counter_map {
  31   const char *name;
  32   enum debug_counter counter;
  33 };
  34
  35 #define DEBUG_COUNTER(a) { #a , a },
  36
  37 static struct string2counter_map map[debug_counter_number_of_counters] =
  38 {
  39 #include "dbgcnt.def"
  40 };
  41 #undef DEBUG_COUNTER
  42
  43 #define DEBUG_COUNTER(a) UINT_MAX,
  44 static unsigned int limit[debug_counter_number_of_counters] =
  45 {
  46 #include "dbgcnt.def"
  47 };
  48 #undef DEBUG_COUNTER
  49
  50 static unsigned int count[debug_counter_number_of_counters];
  51
  52 bool
  53 dbg_cnt_is_enabled (enum debug_counter index)
  54 {
  55   return count[index] <= limit[index];
  56 }
  57
  58 bool
  59 dbg_cnt (enum debug_counter index)
  60 {
  61   count[index]++;
  62   return dbg_cnt_is_enabled (index);
  63 }
  64
  65
  66 static void
  67 dbg_cnt_set_limit_by_index (enum debug_counter index, int value)
  68 {
  69   limit[index] = value;
  70
  71   fprintf (stderr, "dbg_cnt '%s' set to %d\n", map[index].name, value);
  72 }
  73
  74 static bool
  75 dbg_cnt_set_limit_by_name (const char *name, int len, int value)
  76 {
  77   int i;
  78   for (i = debug_counter_number_of_counters - 1; i >= 0; i--)
  79     if (!strncmp (map[i].name, name, len))
  80       break;
  81
  82   if (i < 0)
  83     return false;
  84
  85   dbg_cnt_set_limit_by_index (i, value);
  86   return true;
  87 }
  88
  89
  90 /* Process a single "name:value" pair.
  91    Returns NULL if there's no valid pair is found.
  92    Otherwise returns a pointer to the end of the pair. */
  93
  94 static const char *
  95 dbg_cnt_process_single_pair (const char *arg)
  96 {
  97    char *colon = strchr (arg, ':');
  98    char *endptr = NULL;
  99    int value;
 100
 101    if (colon == NULL)
 102      return NULL;
 103
 104    value = strtol (colon + 1, &endptr, 10);
 105
 106    if (endptr != NULL && endptr != colon + 1
 107        && dbg_cnt_set_limit_by_name (arg, colon - arg, value))
 108      return endptr;
 109
 110    return NULL;
 111 }
 112
 113 void
 114 dbg_cnt_process_opt (const char *arg)
 115 {
 116    const char *start = arg;
 117    const char *next;
 118    do {
 119      next = dbg_cnt_process_single_pair (arg);
 120      if (next == NULL)
 121        break;
 122    } while (*next == ',' && (arg = next + 1));
 123
 124    if (next == NULL || *next != 0)
 125      {
 126        char *buffer = alloca (arg - start + 2);
 127        sprintf (buffer, "%*c", (int)(1 + (arg - start)), '^');
 128        error ("Can not find a valid counter:value pair:");
 129        error ("-fdbg-cnt=%s", start);
 130        error ("          %s", buffer);
 131      }
 132 }
 133
 134 /* Print name, limit and count of all counters.   */
 135
 136 void dbg_cnt_list_all_counters (void)
 137 {
 138   int i;
 139   printf ("  %-30s %-5s %-5s\n", "counter name",  "limit", "value");
 140   printf ("----------------------------------------------\n");
 141   for (i = 0; i < debug_counter_number_of_counters; i++)
 142     printf ("  %-30s %5d %5u\n",
 143             map[i].name, limit[map[i].counter], count[map[i].counter]);
 144   printf ("\n");
 145 }