gcc/dbgcnt.c

   1 /* Debug counter for debugging support
   2    Copyright (C) 2006-2017 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 "dumpfile.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   if (dump_file && count[index] == limit[index])
  63     fprintf (dump_file, "***dbgcnt: limit reached for %s.***\n",
  64              map[index].name);
  65
  66   return dbg_cnt_is_enabled (index);
  67 }
  68
  69
  70 static void
  71 dbg_cnt_set_limit_by_index (enum debug_counter index, int value)
  72 {
  73   limit[index] = value;
  74
  75   fprintf (stderr, "dbg_cnt '%s' set to %d\n", map[index].name, value);
  76 }
  77
  78 static bool
  79 dbg_cnt_set_limit_by_name (const char *name, int len, int value)
  80 {
  81   int i;
  82   for (i = debug_counter_number_of_counters - 1; i >= 0; i--)
  83     if (strncmp (map[i].name, name, len) == 0
  84         && map[i].name[len] == '\0')
  85       break;
  86
  87   if (i < 0)
  88     return false;
  89
  90   dbg_cnt_set_limit_by_index ((enum debug_counter) i, value);
  91   return true;
  92 }
  93
  94
  95 /* Process a single "name:value" pair.
  96    Returns NULL if there's no valid pair is found.
  97    Otherwise returns a pointer to the end of the pair. */
  98
  99 static const char *
 100 dbg_cnt_process_single_pair (const char *arg)
 101 {
 102    const char *colon = strchr (arg, ':');
 103    char *endptr = NULL;
 104    int value;
 105
 106    if (colon == NULL)
 107      return NULL;
 108
 109    value = strtol (colon + 1, &endptr, 10);
 110
 111    if (endptr != NULL && endptr != colon + 1
 112        && dbg_cnt_set_limit_by_name (arg, colon - arg, value))
 113      return endptr;
 114
 115    return NULL;
 116 }
 117
 118 void
 119 dbg_cnt_process_opt (const char *arg)
 120 {
 121    const char *start = arg;
 122    const char *next;
 123    do {
 124      next = dbg_cnt_process_single_pair (arg);
 125      if (next == NULL)
 126        break;
 127    } while (*next == ',' && (arg = next + 1));
 128
 129    if (next == NULL || *next != 0)
 130      {
 131        char *buffer = XALLOCAVEC (char, arg - start + 2);
 132        sprintf (buffer, "%*c", (int)(1 + (arg - start)), '^');
 133        error ("cannot find a valid counter:value pair:");
 134        error ("-fdbg-cnt=%s", start);
 135        error ("          %s", buffer);
 136      }
 137 }
 138
 139 /* Print name, limit and count of all counters.   */
 140
 141 void
 142 dbg_cnt_list_all_counters (void)
 143 {
 144   int i;
 145   printf ("  %-30s %-5s %-5s\n", "counter name",  "limit", "value");
 146   printf ("----------------------------------------------\n");
 147   for (i = 0; i < debug_counter_number_of_counters; i++)
 148     printf ("  %-30s %5d %5u\n",
 149             map[i].name, limit[map[i].counter], count[map[i].counter]);
 150   printf ("\n");
 151 }