sim/igen/filter.c

   1 /* The IGEN simulator generator for GDB, the GNU Debugger.
   2
   3    Copyright 2002-2024 Free Software Foundation, Inc.
   4
   5    Contributed by Andrew Cagney.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22
  23 #include <stdio.h>
  24 #include <string.h>
  25
  26 #include "misc.h"
  27 #include "lf.h"
  28 #include "filter.h"
  29
  30 struct _filter
  31 {
  32   char *member;
  33   filter *next;
  34 };
  35
  36
  37 void
  38 filter_parse (filter **filters, const char *filt)
  39 {
  40   while (strlen (filt) > 0)
  41     {
  42       filter *new_filter;
  43       filter **last;
  44       /* break out a member of the filter list */
  45       const char *flag = filt;
  46       unsigned /*size_t */ len;
  47       filt = strchr (filt, ',');
  48       if (filt == NULL)
  49         {
  50           filt = strchr (flag, '\0');
  51           len = strlen (flag);
  52         }
  53       else
  54         {
  55           len = filt - flag;
  56           filt = filt + 1;
  57         }
  58       /* find an insertion point - sorted order */
  59       last = filters;
  60       while (*last != NULL && strncmp (flag, (*last)->member, len) > 0)
  61         last = &(*last)->next;
  62       if (*last != NULL
  63           && strncmp (flag, (*last)->member, len) == 0
  64           && strlen ((*last)->member) == len)
  65         continue;               /* duplicate */
  66       /* create an entry for that member */
  67       new_filter = ZALLOC (filter);
  68       new_filter->member = NZALLOC (char, len + 1);
  69       strncpy (new_filter->member, flag, len);
  70       /* insert it */
  71       new_filter->next = *last;
  72       *last = new_filter;
  73     }
  74 }
  75
  76
  77 void
  78 filter_add (filter **set, const filter *add)
  79 {
  80   while (add != NULL)
  81     {
  82       int cmp;
  83       if (*set == NULL)
  84         cmp = 1;                /* set->member > add->member */
  85       else
  86         cmp = strcmp ((*set)->member, add->member);
  87       if (cmp > 0)
  88         {
  89           /* insert it here */
  90           filter *new = ZALLOC (filter);
  91           new->member = NZALLOC (char, strlen (add->member) + 1);
  92           strcpy (new->member, add->member);
  93           new->next = *set;
  94           *set = new;
  95           add = add->next;
  96         }
  97       else if (cmp == 0)
  98         {
  99           /* already in set */
 100           add = add->next;
 101         }
 102       else                      /* cmp < 0 */
 103         {
 104           /* not reached insertion point */
 105           set = &(*set)->next;
 106         }
 107     }
 108 }
 109
 110
 111 int
 112 filter_is_subset (const filter *superset, const filter *subset)
 113 {
 114   while (1)
 115     {
 116       int cmp;
 117       if (subset == NULL)
 118         return 1;
 119       if (superset == NULL)
 120         return 0;               /* subset isn't finished */
 121       cmp = strcmp (subset->member, superset->member);
 122       if (cmp < 0)
 123         return 0;               /* not found */
 124       else if (cmp == 0)
 125         subset = subset->next;  /* found */
 126       else if (cmp > 0)
 127         superset = superset->next;      /* later in list? */
 128     }
 129 }
 130
 131
 132 int
 133 filter_is_common (const filter *l, const filter *r)
 134 {
 135   while (1)
 136     {
 137       int cmp;
 138       if (l == NULL)
 139         return 0;
 140       if (r == NULL)
 141         return 0;
 142       cmp = strcmp (l->member, r->member);
 143       if (cmp < 0)
 144         l = l->next;
 145       else if (cmp == 0)
 146         return 1;               /* common member */
 147       else if (cmp > 0)
 148         r = r->next;
 149     }
 150 }
 151
 152
 153 int
 154 filter_is_member (const filter *filt, const char *flag)
 155 {
 156   int index = 1;
 157   while (filt != NULL)
 158     {
 159       if (strcmp (flag, filt->member) == 0)
 160         return index;
 161       filt = filt->next;
 162       index++;
 163     }
 164   return 0;
 165 }
 166
 167
 168 int
 169 is_filtered_out (const filter *filters, const char *flags)
 170 {
 171   while (strlen (flags) > 0)
 172     {
 173       int present;
 174       const filter *filt = filters;
 175       /* break the string up */
 176       const char *end = strchr (flags, ',');
 177       const char *next;
 178       unsigned /*size_t */ len;
 179       if (end == NULL)
 180         {
 181           end = strchr (flags, '\0');
 182           next = end;
 183         }
 184       else
 185         {
 186           next = end + 1;
 187         }
 188       len = end - flags;
 189       /* check that it is present */
 190       present = 0;
 191       filt = filters;
 192       while (filt != NULL)
 193         {
 194           if (strncmp (flags, filt->member, len) == 0
 195               && strlen (filt->member) == len)
 196             {
 197               present = 1;
 198               break;
 199             }
 200           filt = filt->next;
 201         }
 202       if (!present)
 203         return 1;
 204       flags = next;
 205     }
 206   return 0;
 207 }
 208
 209
 210 const char *
 211 filter_next (const filter *set, const char *member)
 212 {
 213   while (set != NULL)
 214     {
 215       if (strcmp (set->member, member) > 0)
 216         return set->member;
 217       set = set->next;
 218     }
 219   return NULL;
 220 }
 221
 222
 223 void
 224 dump_filter (lf *file,
 225              const char *prefix,
 226              const filter *set,
 227              const char *suffix)
 228 {
 229   const char *member;
 230   lf_printf (file, "%s", prefix);
 231   member = filter_next (set, "");
 232   if (member != NULL)
 233     {
 234       while (1)
 235         {
 236           lf_printf (file, "%s", member);
 237           member = filter_next (set, member);
 238           if (member == NULL)
 239             break;
 240           lf_printf (file, ",");
 241         }
 242     }
 243   lf_printf (file, "%s", suffix);
 244 }
 245
 246
 247 #ifdef MAIN
 248 int
 249 main (int argc, char **argv)
 250 {
 251   filter *subset = NULL;
 252   filter *superset = NULL;
 253   lf *l;
 254   int i;
 255   if (argc < 2)
 256     {
 257       printf ("Usage: filter <subset> <filter> ...\n");
 258       exit (1);
 259     }
 260
 261   /* load the filter up */
 262   filter_parse (&subset, argv[1]);
 263   for (i = 2; i < argc; i++)
 264     filter_parse (&superset, argv[i]);
 265
 266   /* dump various info */
 267   l = lf_open ("-", "stdout", lf_omit_references, lf_is_text, "tmp-filter");
 268
 269   /* subset */
 270   {
 271     dump_filter (l, "{", subset, " }");
 272     if (filter_is_subset (superset, subset))
 273       lf_printf (l, " subset of ");
 274     else
 275       lf_printf (l, " !subset of ");
 276     dump_filter (l, "{", superset, " }");
 277     lf_printf (l, "\n");
 278   }
 279   /* intersection */
 280   {
 281     dump_filter (l, "{", subset, " }");
 282     if (filter_is_common (subset, superset))
 283       lf_printf (l, " intersects ");
 284     else
 285       lf_printf (l, " !intersects ");
 286     dump_filter (l, "{", superset, " }");
 287     lf_printf (l, "\n");
 288   }
 289   /* membership */
 290   {
 291     filter *memb = subset;
 292     while (memb != NULL)
 293       {
 294         lf_printf (l, "%s", memb->member);
 295         if (filter_is_member (superset, memb->member))
 296           lf_printf (l, " in ");
 297         else
 298           lf_printf (l, " !in ");
 299         dump_filter (l, "{", superset, " }");
 300         lf_printf (l, "\n");
 301         memb = memb->next;
 302       }
 303   }
 304   /* addition */
 305   {
 306     filter *add = NULL;
 307     filter_add (&add, superset);
 308     filter_add (&add, subset);
 309     dump_filter (l, "{", add, " }");
 310     lf_printf (l, " = ");
 311     dump_filter (l, "{", subset, " }");
 312     lf_printf (l, " + ");
 313     dump_filter (l, "{", superset, " }");
 314     lf_printf (l, "\n");
 315   }
 316
 317   return 0;
 318 }
 319 #endif