smatch_extra.c

   1 /*
   2  * sparse/smatch_extra.c
   3  *
   4  * Copyright (C) 2008 Dan Carpenter.
   5  *
   6  * Licensed under the Open Software License version 1.1
   7  *
   8  */
   9
  10 /*
  11  * smatch_extra.c is supposed to track the value of every variable.
  12  *
  13  */
  14
  15 #include <stdlib.h>
  16 #include <errno.h>
  17 #ifndef __USE_ISOC99
  18 #define __USE_ISOC99
  19 #endif
  20 #include <limits.h>
  21 #include "parse.h"
  22 #include "smatch.h"
  23 #include "smatch_slist.h"
  24 #include "smatch_extra.h"
  25
  26 static int my_id;
  27
  28 struct string_list *__ignored_macros = NULL;
  29 static int in_warn_on_macro()
  30 {
  31         struct statement *stmt;
  32         char *tmp;
  33         char *macro;
  34
  35         stmt = get_current_statement();
  36         macro = get_macro_name(stmt->pos);
  37         if (!macro)
  38                 return 0;
  39
  40         FOR_EACH_PTR(__ignored_macros, tmp) {
  41                 if (!strcmp(tmp, macro))
  42                         return 1;
  43         } END_FOR_EACH_PTR(tmp);
  44         return 0;
  45 }
  46
  47 typedef void (mod_hook)(const char *name, struct symbol *sym, struct smatch_state *state);
  48 DECLARE_PTR_LIST(void_fn_list, mod_hook *);
  49 static struct void_fn_list *extra_mod_hooks;
  50 void add_extra_mod_hook(mod_hook *fn)
  51 {
  52         mod_hook **p = malloc(sizeof(mod_hook *));
  53         *p = fn;
  54         add_ptr_list(&extra_mod_hooks, p);
  55 }
  56
  57 void call_extra_mod_hooks(const char *name, struct symbol *sym, struct smatch_state *state)
  58 {
  59         mod_hook **fn;
  60
  61         FOR_EACH_PTR(extra_mod_hooks, fn) {
  62                 (*fn)(name, sym, state);
  63         } END_FOR_EACH_PTR(fn);
  64 }
  65
  66 struct sm_state *set_extra_mod(const char *name, struct symbol *sym, struct smatch_state *state)
  67 {
  68         if (in_warn_on_macro())
  69                 return NULL;
  70         remove_from_equiv(name, sym);
  71         call_extra_mod_hooks(name, sym, state);
  72         return set_state(SMATCH_EXTRA, name, sym, state);
  73 }
  74
  75 struct sm_state *set_extra_expr_mod(struct expression *expr, struct smatch_state *state)
  76 {
  77         struct symbol *sym;
  78         char *name;
  79         struct sm_state *ret = NULL;
  80
  81         expr = strip_expr(expr);
  82         name = expr_to_var_sym(expr, &sym);
  83         if (!name || !sym)
  84                 goto free;
  85         ret = set_extra_mod(name, sym, state);
  86 free:
  87         free_string(name);
  88         return ret;
  89 }
  90
  91 void set_extra_nomod(const char *name, struct symbol *sym, struct smatch_state *state)
  92 {
  93         struct relation *rel;
  94         struct smatch_state *orig_state;
  95
  96         orig_state = get_state(SMATCH_EXTRA, name, sym);
  97
  98         if (!estate_related(orig_state)) {
  99                 set_state(SMATCH_EXTRA, name, sym, state);
 100                 return;
 101         }
 102
 103         set_related(state, estate_related(orig_state));
 104         FOR_EACH_PTR(estate_related(orig_state), rel) {
 105                 if (option_debug_related)
 106                         sm_msg("updating related %s to %s", rel->name, state->name);
 107                 set_state(SMATCH_EXTRA, rel->name, rel->sym, state);
 108         } END_FOR_EACH_PTR(rel);
 109 }
 110
 111 /*
 112  * This is for return_implies_state() hooks which modify a SMATCH_EXTRA state
 113  */
 114 void set_extra_expr_nomod(struct expression *expr, struct smatch_state *state)
 115 {
 116         char *name;
 117         struct symbol *sym;
 118
 119         name = expr_to_var_sym(expr, &sym);
 120         if (!name || !sym)
 121                 goto free;
 122         set_extra_nomod(name, sym, state);
 123 free:
 124         free_string(name);
 125
 126 }
 127
 128 static void set_extra_true_false(const char *name, struct symbol *sym,
 129                         struct smatch_state *true_state,
 130                         struct smatch_state *false_state)
 131 {
 132         struct relation *rel;
 133         struct smatch_state *orig_state;
 134
 135         if (in_warn_on_macro())
 136                 return;
 137
 138         orig_state = get_state(SMATCH_EXTRA, name, sym);
 139
 140         if (!estate_related(orig_state)) {
 141                 set_true_false_states(SMATCH_EXTRA, name, sym, true_state, false_state);
 142                 return;
 143         }
 144
 145         if (true_state)
 146                 set_related(true_state, estate_related(orig_state));
 147         if (false_state)
 148                 set_related(false_state, estate_related(orig_state));
 149
 150         FOR_EACH_PTR(estate_related(orig_state), rel) {
 151                 set_true_false_states(SMATCH_EXTRA, rel->name, rel->sym,
 152                                 true_state, false_state);
 153         } END_FOR_EACH_PTR(rel);
 154 }
 155
 156 static void set_extra_expr_true_false(struct expression *expr,
 157                 struct smatch_state *true_state,
 158                 struct smatch_state *false_state)
 159 {
 160         char *name;
 161         struct symbol *sym;
 162
 163         expr = strip_expr(expr);
 164         name = expr_to_var_sym(expr, &sym);
 165         if (!name || !sym)
 166                 goto free;
 167         set_extra_true_false(name, sym, true_state, false_state);
 168 free:
 169         free_string(name);
 170 }
 171
 172 static struct sm_state *handle_canonical_while_count_down(struct statement *loop)
 173 {
 174         struct expression *iter_var;
 175         struct expression *condition;
 176         struct sm_state *sm;
 177         struct smatch_state *estate;
 178         sval_t start;
 179
 180         condition = strip_expr(loop->iterator_pre_condition);
 181         if (!condition)
 182                 return NULL;
 183         if (condition->type != EXPR_PREOP && condition->type != EXPR_POSTOP)
 184                 return NULL;
 185         if (condition->op != SPECIAL_DECREMENT)
 186                 return NULL;
 187
 188         iter_var = condition->unop;
 189         sm = get_sm_state_expr(SMATCH_EXTRA, iter_var);
 190         if (!sm)
 191                 return NULL;
 192         if (sval_cmp_val(estate_min(sm->state), 0) < 0)
 193                 return NULL;
 194         start = estate_max(sm->state);
 195         if  (sval_cmp_val(start, 0) <= 0)
 196                 return NULL;
 197         if (!sval_is_max(start))
 198                 start.value--;
 199
 200         if (condition->type == EXPR_PREOP) {
 201                 estate = alloc_estate_range(sval_type_val(start.type, 1), start);
 202                 if (estate_has_hard_max(sm->state))
 203                         estate_set_hard_max(estate);
 204                 set_extra_expr_mod(iter_var, estate);
 205         }
 206         if (condition->type == EXPR_POSTOP) {
 207                 estate = alloc_estate_range(sval_type_val(start.type, 0), start);
 208                 if (estate_has_hard_max(sm->state))
 209                         estate_set_hard_max(estate);
 210                 set_extra_expr_mod(iter_var, estate);
 211         }
 212         return get_sm_state_expr(SMATCH_EXTRA, iter_var);
 213 }
 214
 215 static struct sm_state *handle_canonical_for_inc(struct expression *iter_expr,
 216                                                 struct expression *condition)
 217 {
 218         struct expression *iter_var;
 219         struct sm_state *sm;
 220         struct smatch_state *estate;
 221         sval_t start, end, dummy;
 222
 223         iter_var = iter_expr->unop;
 224         sm = get_sm_state_expr(SMATCH_EXTRA, iter_var);
 225         if (!sm)
 226                 return NULL;
 227         if (!estate_get_single_value(sm->state, &start))
 228                 return NULL;
 229         if (get_implied_max(condition->right, &end))
 230                 end = sval_cast(get_type(iter_var), end);
 231         else
 232                 end = sval_type_max(get_type(iter_var));
 233
 234         if (get_sm_state_expr(SMATCH_EXTRA, condition->left) != sm)
 235                 return NULL;
 236
 237         switch (condition->op) {
 238         case SPECIAL_NOTEQUAL:
 239         case '<':
 240                 if (!sval_is_min(end))
 241                         end.value--;
 242                 break;
 243         case SPECIAL_LTE:
 244                 break;
 245         default:
 246                 return NULL;
 247         }
 248         if (sval_cmp(end, start) < 0)
 249                 return NULL;
 250         estate = alloc_estate_range(start, end);
 251         if (get_hard_max(condition->right, &dummy))
 252                 estate_set_hard_max(estate);
 253         set_extra_expr_mod(iter_var, estate);
 254         return get_sm_state_expr(SMATCH_EXTRA, iter_var);
 255 }
 256
 257 static struct sm_state *handle_canonical_for_dec(struct expression *iter_expr,
 258                                                 struct expression *condition)
 259 {
 260         struct expression *iter_var;
 261         struct sm_state *sm;
 262         struct smatch_state *estate;
 263         sval_t start, end;
 264
 265         iter_var = iter_expr->unop;
 266         sm = get_sm_state_expr(SMATCH_EXTRA, iter_var);
 267         if (!sm)
 268                 return NULL;
 269         if (!estate_get_single_value(sm->state, &start))
 270                 return NULL;
 271         if (!get_implied_min(condition->right, &end))
 272                 end = sval_type_min(get_type(iter_var));
 273         if (get_sm_state_expr(SMATCH_EXTRA, condition->left) != sm)
 274                 return NULL;
 275
 276         switch (condition->op) {
 277         case SPECIAL_NOTEQUAL:
 278         case '>':
 279                 if (!sval_is_min(end) && !sval_is_max(end))
 280                         end.value++;
 281                 break;
 282         case SPECIAL_GTE:
 283                 break;
 284         default:
 285                 return NULL;
 286         }
 287         if (sval_cmp(end, start) > 0)
 288                 return NULL;
 289         estate = alloc_estate_range(end, start);
 290         estate_set_hard_max(estate);
 291         set_extra_expr_mod(iter_var, estate);
 292         return get_sm_state_expr(SMATCH_EXTRA, iter_var);
 293 }
 294
 295 static struct sm_state *handle_canonical_for_loops(struct statement *loop)
 296 {
 297         struct expression *iter_expr;
 298         struct expression *condition;
 299
 300         if (!loop->iterator_post_statement)
 301                 return NULL;
 302         if (loop->iterator_post_statement->type != STMT_EXPRESSION)
 303                 return NULL;
 304         iter_expr = loop->iterator_post_statement->expression;
 305         if (!loop->iterator_pre_condition)
 306                 return NULL;
 307         if (loop->iterator_pre_condition->type != EXPR_COMPARE)
 308                 return NULL;
 309         condition = loop->iterator_pre_condition;
 310
 311         if (iter_expr->op == SPECIAL_INCREMENT)
 312                 return handle_canonical_for_inc(iter_expr, condition);
 313         if (iter_expr->op == SPECIAL_DECREMENT)
 314                 return handle_canonical_for_dec(iter_expr, condition);
 315         return NULL;
 316 }
 317
 318 struct sm_state *__extra_handle_canonical_loops(struct statement *loop, struct state_list **slist)
 319 {
 320         struct sm_state *ret;
 321
 322         __push_fake_cur_slist();
 323         if (!loop->iterator_post_statement)
 324                 ret = handle_canonical_while_count_down(loop);
 325         else
 326                 ret = handle_canonical_for_loops(loop);
 327         *slist = __pop_fake_cur_slist();
 328         return ret;
 329 }
 330
 331 int __iterator_unchanged(struct sm_state *sm)
 332 {
 333         if (!sm)
 334                 return 0;
 335         if (get_sm_state(my_id, sm->name, sm->sym) == sm)
 336                 return 1;
 337         return 0;
 338 }
 339
 340 static void while_count_down_after(struct sm_state *sm, struct expression *condition)
 341 {
 342         sval_t after_value;
 343
 344         /* paranoid checking.  prolly not needed */
 345         condition = strip_expr(condition);
 346         if (!condition)
 347                 return;
 348         if (condition->type != EXPR_PREOP && condition->type != EXPR_POSTOP)
 349                 return;
 350         if (condition->op != SPECIAL_DECREMENT)
 351                 return;
 352         after_value = estate_min(sm->state);
 353         after_value.value--;
 354         set_extra_mod(sm->name, sm->sym, alloc_estate_sval(after_value));
 355 }
 356
 357 void __extra_pre_loop_hook_after(struct sm_state *sm,
 358                                 struct statement *iterator,
 359                                 struct expression *condition)
 360 {
 361         struct expression *iter_expr;
 362         sval_t limit;
 363         struct smatch_state *state;
 364
 365         if (!iterator) {
 366                 while_count_down_after(sm, condition);
 367                 return;
 368         }
 369
 370         iter_expr = iterator->expression;
 371
 372         if (condition->type != EXPR_COMPARE)
 373                 return;
 374         if (iter_expr->op == SPECIAL_INCREMENT) {
 375                 limit = sval_binop(estate_max(sm->state), '+',
 376                                    sval_type_val(estate_type(sm->state), 1));
 377         } else {
 378                 limit = sval_binop(estate_min(sm->state), '-',
 379                                    sval_type_val(estate_type(sm->state), 1));
 380         }
 381         if (!estate_has_hard_max(sm->state) && !__has_breaks()) {
 382                 if (iter_expr->op == SPECIAL_INCREMENT)
 383                         state = alloc_estate_range(estate_min(sm->state), limit);
 384                 else
 385                         state = alloc_estate_range(limit, estate_max(sm->state));
 386         } else {
 387                 state = alloc_estate_sval(limit);
 388         }
 389         if (!estate_has_hard_max(sm->state))
 390                 estate_clear_hard_max(state);
 391         set_extra_mod(sm->name, sm->sym, state);
 392 }
 393
 394 static struct state_list *unmatched_slist;
 395 static struct smatch_state *unmatched_state(struct sm_state *sm)
 396 {
 397         struct smatch_state *state;
 398
 399         if (unmatched_slist) {
 400                 state = get_state_slist(unmatched_slist, SMATCH_EXTRA, sm->name, sm->sym);
 401                 if (state)
 402                         return state;
 403         }
 404         return alloc_estate_whole(estate_type(sm->state));
 405 }
 406
 407 static void clear_the_pointed_at(struct expression *expr, struct state_list *slist)
 408 {
 409         char *name;
 410         struct symbol *sym;
 411         struct sm_state *tmp;
 412
 413         name = expr_to_var_sym(expr, &sym);
 414         if (!name || !sym)
 415                 goto free;
 416
 417         FOR_EACH_PTR(slist, tmp) {
 418                 if (tmp->name[0] != '*')
 419                         continue;
 420                 if (tmp->sym != sym)
 421                         continue;
 422                 if (strcmp(tmp->name + 1, name) != 0)
 423                         continue;
 424                 set_extra_mod(tmp->name, tmp->sym, alloc_estate_whole(estate_type(tmp->state)));
 425         } END_FOR_EACH_PTR(tmp);
 426
 427 free:
 428         free_string(name);
 429 }
 430
 431 static void match_function_call(struct expression *expr)
 432 {
 433         struct expression *arg;
 434         struct expression *tmp;
 435         struct state_list *slist;
 436
 437         slist = get_all_states(SMATCH_EXTRA);
 438
 439         FOR_EACH_PTR(expr->args, arg) {
 440                 tmp = strip_expr(arg);
 441                 if (tmp->type == EXPR_PREOP && tmp->op == '&')
 442                         set_extra_expr_mod(tmp->unop, alloc_estate_whole(get_type(tmp->unop)));
 443                 else
 444                         clear_the_pointed_at(tmp, slist);
 445         } END_FOR_EACH_PTR(arg);
 446
 447         free_slist(&slist);
 448 }
 449
 450 static int types_equiv_or_pointer(struct symbol *one, struct symbol *two)
 451 {
 452         if (!one || !two)
 453                 return 0;
 454         if (one->type == SYM_PTR && two->type == SYM_PTR)
 455                 return 1;
 456         return types_equiv(one, two);
 457 }
 458
 459 static void match_vanilla_assign(struct expression *left, struct expression *right)
 460 {
 461         struct range_list *rl = NULL;
 462         struct symbol *right_sym;
 463         struct symbol *left_type;
 464         struct symbol *right_type;
 465         char *right_name = NULL;
 466         struct symbol *sym;
 467         char *name;
 468         sval_t tmp;
 469         struct smatch_state *state;
 470
 471         name = expr_to_var_sym(left, &sym);
 472         if (!name)
 473                 return;
 474
 475         left_type = get_type(left);
 476         right_type = get_type(right);
 477
 478         right_name = expr_to_var_sym(right, &right_sym);
 479         if (right_name && right_sym &&
 480             types_equiv_or_pointer(left_type, right_type)) {
 481                 set_equiv(left, right);
 482                 goto free;
 483         }
 484
 485         if (get_implied_rl(right, &rl)) {
 486                 rl = cast_rl(left_type, rl);
 487                 state = alloc_estate_rl(rl);
 488                 if (get_hard_max(right, &tmp))
 489                         estate_set_hard_max(state);
 490         } else {
 491                 rl = alloc_whole_rl(right_type);
 492                 rl = cast_rl(left_type, rl);
 493                 state = alloc_estate_rl(rl);
 494         }
 495         set_extra_mod(name, sym, state);
 496 free:
 497         free_string(right_name);
 498 }
 499
 500 static int op_remove_assign(int op)
 501 {
 502         switch (op) {
 503         case SPECIAL_ADD_ASSIGN:
 504                 return '+';
 505         case SPECIAL_SUB_ASSIGN:
 506                 return '-';
 507         case SPECIAL_MUL_ASSIGN:
 508                 return '*';
 509         case SPECIAL_DIV_ASSIGN:
 510                 return '/';
 511         case SPECIAL_MOD_ASSIGN:
 512                 return '%';
 513         case SPECIAL_AND_ASSIGN:
 514                 return '&';
 515         case SPECIAL_OR_ASSIGN:
 516                 return '|';
 517         case SPECIAL_XOR_ASSIGN:
 518                 return '^';
 519         case SPECIAL_SHL_ASSIGN:
 520                 return SPECIAL_LEFTSHIFT;
 521         case SPECIAL_SHR_ASSIGN:
 522                 return SPECIAL_RIGHTSHIFT;
 523         default:
 524                 return op;
 525         }
 526 }
 527
 528 static void match_assign(struct expression *expr)
 529 {
 530         struct range_list *rl = NULL;
 531         struct expression *left;
 532         struct expression *right;
 533         struct expression *binop_expr;
 534         struct symbol *left_type;
 535         struct symbol *right_type;
 536         struct symbol *sym;
 537         char *name;
 538         sval_t left_min, left_max;
 539         sval_t right_min, right_max;
 540         sval_t res_min, res_max;
 541
 542         left = strip_expr(expr->left);
 543
 544         right = strip_expr(expr->right);
 545         while (right->type == EXPR_ASSIGNMENT && right->op == '=')
 546                 right = strip_expr(right->left);
 547
 548         if (is_condition(expr->right))
 549                 return; /* handled in smatch_condition.c */
 550         if (expr->op == '=' && right->type == EXPR_CALL)
 551                 return; /* handled in smatch_function_hooks.c */
 552         if (expr->op == '=') {
 553                 match_vanilla_assign(left, right);
 554                 return;
 555         }
 556
 557         name = expr_to_var_sym(left, &sym);
 558         if (!name)
 559                 return;
 560
 561         left_type = get_type(left);
 562         right_type = get_type(right);
 563
 564         res_min = sval_type_min(right_type);
 565         res_max = sval_type_max(right_type);
 566
 567         switch (expr->op) {
 568         case SPECIAL_ADD_ASSIGN:
 569                 get_absolute_max(left, &left_max);
 570                 get_absolute_max(right, &right_max);
 571                 if (sval_binop_overflows(left_max, '+', right_max))
 572                         break;
 573                 if (get_implied_min(left, &left_min) &&
 574                     !sval_is_negative_min(left_min) &&
 575                     get_implied_min(right, &right_min) &&
 576                     !sval_is_negative_min(right_min)) {
 577                         res_min = sval_binop(left_min, '+', right_min);
 578                         res_min = sval_cast(right_type, res_min);
 579                 }
 580                 if (inside_loop())  /* we are assuming loops don't lead to wrapping */
 581                         break;
 582                 res_max = sval_binop(left_max, '+', right_max);
 583                 res_max = sval_cast(right_type, res_max);
 584                 break;
 585         case SPECIAL_SUB_ASSIGN:
 586                 if (get_implied_max(left, &left_max) &&
 587                     !sval_is_max(left_max) &&
 588                     get_implied_min(right, &right_min) &&
 589                     !sval_is_min(right_min)) {
 590                         res_max = sval_binop(left_max, '-', right_min);
 591                         res_max = sval_cast(right_type, res_max);
 592                 }
 593                 if (inside_loop())
 594                         break;
 595                 if (get_implied_min(left, &left_min) &&
 596                     !sval_is_min(left_min) &&
 597                     get_implied_max(right, &right_max) &&
 598                     !sval_is_max(right_max)) {
 599                         res_min = sval_binop(left_min, '-', right_max);
 600                         res_min = sval_cast(right_type, res_min);
 601                 }
 602                 break;
 603         case SPECIAL_AND_ASSIGN:
 604         case SPECIAL_MOD_ASSIGN:
 605                 binop_expr = binop_expression(expr->left,
 606                                               op_remove_assign(expr->op),
 607                                               expr->right);
 608                 if (get_implied_rl(binop_expr, &rl)) {
 609                         rl = cast_rl(left_type, rl);
 610                         set_extra_mod(name, sym, alloc_estate_rl(rl));
 611                         goto free;
 612                 }
 613         }
 614         rl = cast_rl(left_type, alloc_rl(res_min, res_max));
 615         set_extra_mod(name, sym, alloc_estate_rl(rl));
 616 free:
 617         free_string(name);
 618 }
 619
 620 static void reset_struct_members(struct sm_state *sm)
 621 {
 622         if (!estate_rl(sm->state))
 623                 return;
 624         set_extra_mod(sm->name, sm->sym, alloc_estate_whole(estate_type(sm->state)));
 625 }
 626
 627 static struct smatch_state *increment_state(struct smatch_state *state)
 628 {
 629         sval_t min = estate_min(state);
 630         sval_t max = estate_max(state);
 631
 632         if (!estate_rl(state))
 633                 return NULL;
 634
 635         if (inside_loop())
 636                 max = sval_type_max(max.type);
 637
 638         if (!sval_is_min(min) && !sval_is_max(min))
 639                 min.value++;
 640         if (!sval_is_min(max) && !sval_is_max(max))
 641                 max.value++;
 642         return alloc_estate_range(min, max);
 643 }
 644
 645 static struct smatch_state *decrement_state(struct smatch_state *state)
 646 {
 647         sval_t min = estate_min(state);
 648         sval_t max = estate_max(state);
 649
 650         if (!estate_rl(state))
 651                 return NULL;
 652
 653         if (inside_loop())
 654                 min = sval_type_min(min.type);
 655
 656         if (!sval_is_min(min) && !sval_is_max(min))
 657                 min.value--;
 658         if (!sval_is_min(max) && !sval_is_max(max))
 659                 max.value--;
 660         return alloc_estate_range(min, max);
 661 }
 662
 663 static void unop_expr(struct expression *expr)
 664 {
 665         struct smatch_state *state;
 666
 667         if (expr->smatch_flags & Handled)
 668                 return;
 669
 670         switch (expr->op) {
 671         case SPECIAL_INCREMENT:
 672                 state = get_state_expr(SMATCH_EXTRA, expr->unop);
 673                 state = increment_state(state);
 674                 if (!state)
 675                         state = alloc_estate_whole(get_type(expr));
 676                 set_extra_expr_mod(expr->unop, state);
 677                 break;
 678         case SPECIAL_DECREMENT:
 679                 state = get_state_expr(SMATCH_EXTRA, expr->unop);
 680                 state = decrement_state(state);
 681                 if (!state)
 682                         state = alloc_estate_whole(get_type(expr));
 683                 set_extra_expr_mod(expr->unop, state);
 684                 break;
 685         default:
 686                 return;
 687         }
 688 }
 689
 690 static void asm_expr(struct statement *stmt)
 691 {
 692
 693         struct expression *expr;
 694         struct symbol *type;
 695         int state = 0;
 696
 697         FOR_EACH_PTR(stmt->asm_outputs, expr) {
 698                 switch (state) {
 699                 case 0: /* identifier */
 700                 case 1: /* constraint */
 701                         state++;
 702                         continue;
 703                 case 2: /* expression */
 704                         state = 0;
 705                         type = get_type(strip_expr(expr));
 706                         set_extra_expr_mod(expr, alloc_estate_whole(type));
 707                         continue;
 708                 }
 709         } END_FOR_EACH_PTR(expr);
 710 }
 711
 712 static void delete_state_tracker(struct tracker *t)
 713 {
 714         remove_from_equiv(t->name, t->sym);
 715         delete_state(t->owner, t->name, t->sym);
 716 }
 717
 718 static void scoped_state_extra(const char *name, struct symbol *sym)
 719 {
 720         struct tracker *t;
 721
 722         t = alloc_tracker(SMATCH_EXTRA, name, sym);
 723         add_scope_hook((scope_hook *)&delete_state_tracker, t);
 724 }
 725
 726 static void match_declarations(struct symbol *sym)
 727 {
 728         const char *name;
 729
 730         if (sym->ident) {
 731                 name = sym->ident->name;
 732                 if (!sym->initializer) {
 733                         set_state(SMATCH_EXTRA, name, sym, alloc_estate_whole(get_real_base_type(sym)));
 734                         scoped_state_extra(name, sym);
 735                 }
 736         }
 737 }
 738
 739 static void check_dereference(struct expression *expr)
 740 {
 741         set_extra_expr_nomod(expr, alloc_estate_range(valid_ptr_min_sval, valid_ptr_max_sval));
 742 }
 743
 744 static void match_dereferences(struct expression *expr)
 745 {
 746         if (expr->type != EXPR_PREOP)
 747                 return;
 748         check_dereference(expr->unop);
 749 }
 750
 751 static void match_pointer_as_array(struct expression *expr)
 752 {
 753         if (!is_array(expr))
 754                 return;
 755         check_dereference(expr->unop->left);
 756 }
 757
 758 static void set_param_dereferenced(struct expression *arg, char *unused)
 759 {
 760         check_dereference(arg);
 761 }
 762
 763 static void match_function_def(struct symbol *sym)
 764 {
 765         struct symbol *arg;
 766
 767         FOR_EACH_PTR(sym->ctype.base_type->arguments, arg) {
 768                 if (!arg->ident)
 769                         continue;
 770                 set_state(my_id, arg->ident->name, arg, alloc_estate_whole(get_real_base_type(arg)));
 771         } END_FOR_EACH_PTR(arg);
 772 }
 773
 774 static int match_func_comparison(struct expression *expr)
 775 {
 776         struct expression *left = strip_expr(expr->left);
 777         struct expression *right = strip_expr(expr->right);
 778         sval_t sval;
 779
 780         if (left->type == EXPR_CALL) {
 781                 if (!get_implied_value(right, &sval))
 782                         return 1;
 783                 function_comparison(expr->op, left, sval, 1);
 784                 return 1;
 785         }
 786
 787         if (right->type == EXPR_CALL) {
 788                 if (!get_implied_value(left, &sval))
 789                         return 1;
 790                 function_comparison(expr->op, right, sval, 0);
 791                 return 1;
 792         }
 793
 794         return 0;
 795 }
 796
 797 static sval_t add_one(sval_t sval)
 798 {
 799         sval.value++;
 800         return sval;
 801 }
 802
 803 static sval_t sub_one(sval_t sval)
 804 {
 805         sval.value--;
 806         return sval;
 807 }
 808
 809 static void match_comparison(struct expression *expr)
 810 {
 811         struct expression *left = strip_expr(expr->left);
 812         struct expression *right = strip_expr(expr->right);
 813         struct symbol *type;
 814         struct range_list *left_orig;
 815         struct range_list *left_true;
 816         struct range_list *left_false;
 817         struct range_list *right_orig;
 818         struct range_list *right_true;
 819         struct range_list *right_false;
 820         struct smatch_state *left_true_state;
 821         struct smatch_state *left_false_state;
 822         struct smatch_state *right_true_state;
 823         struct smatch_state *right_false_state;
 824         sval_t min, max, dummy;
 825         int left_postop = 0;
 826         int right_postop = 0;
 827
 828         if (match_func_comparison(expr))
 829                 return;
 830
 831         if (left->op == SPECIAL_INCREMENT || left->op == SPECIAL_DECREMENT) {
 832                 if (left->type == EXPR_POSTOP) {
 833                         left->smatch_flags |= Handled;
 834                         left_postop = left->op;
 835                 }
 836                 left = strip_expr(left->unop);
 837         }
 838         while (left->type == EXPR_ASSIGNMENT)
 839                 left = strip_expr(left->left);
 840
 841         if (right->op == SPECIAL_INCREMENT || right->op == SPECIAL_DECREMENT) {
 842                 if (right->type == EXPR_POSTOP) {
 843                         right->smatch_flags |= Handled;
 844                         right_postop = right->op;
 845                 }
 846                 right = strip_expr(right->unop);
 847         }
 848
 849         type = get_type(expr);
 850         if (!type)
 851                 type = &llong_ctype;
 852
 853         if (get_implied_rl(left, &left_orig)) {
 854                 left_orig = cast_rl(type, left_orig);
 855         } else {
 856                 min = sval_type_min(get_type(left));
 857                 max = sval_type_max(get_type(left));
 858                 left_orig = cast_rl(type, alloc_rl(min, max));
 859         }
 860
 861         if (get_implied_rl(right, &right_orig)) {
 862                 right_orig = cast_rl(type, right_orig);
 863         } else {
 864                 min = sval_type_min(get_type(right));
 865                 max = sval_type_max(get_type(right));
 866                 right_orig = cast_rl(type, alloc_rl(min, max));
 867         }
 868         min = sval_type_min(type);
 869         max = sval_type_max(type);
 870
 871         left_true = clone_rl(left_orig);
 872         left_false = clone_rl(left_orig);
 873         right_true = clone_rl(right_orig);
 874         right_false = clone_rl(right_orig);
 875
 876         switch (expr->op) {
 877         case '<':
 878         case SPECIAL_UNSIGNED_LT:
 879                 left_true = remove_range(left_orig, rl_max(right_orig), max);
 880                 if (!sval_is_min(rl_min(right_orig))) {
 881                         left_false = remove_range(left_orig, min, sub_one(rl_min(right_orig)));
 882                 }
 883
 884                 right_true = remove_range(right_orig, min, rl_min(left_orig));
 885                 if (!sval_is_max(rl_max(left_orig)))
 886                         right_false = remove_range(right_orig, add_one(rl_max(left_orig)), max);
 887                 break;
 888         case SPECIAL_UNSIGNED_LTE:
 889         case SPECIAL_LTE:
 890                 if (!sval_is_max(rl_max(right_orig)))
 891                         left_true = remove_range(left_orig, add_one(rl_max(right_orig)), max);
 892                 left_false = remove_range(left_orig, min, rl_min(right_orig));
 893
 894                 if (!sval_is_min(rl_min(left_orig)))
 895                         right_true = remove_range(right_orig, min, sub_one(rl_min(left_orig)));
 896                 right_false = remove_range(right_orig, rl_max(left_orig), max);
 897
 898                 if (sval_cmp(rl_min(left_orig), rl_min(right_orig)) == 0)
 899                         left_false = remove_range(left_false, rl_min(left_orig), rl_min(left_orig));
 900                 if (sval_cmp(rl_max(left_orig), rl_max(right_orig)) == 0)
 901                         right_false = remove_range(right_false, rl_max(left_orig), rl_max(left_orig));
 902                 break;
 903         case SPECIAL_EQUAL:
 904                 if (!sval_is_max(rl_max(right_orig))) {
 905                         left_true = remove_range(left_true, add_one(rl_max(right_orig)), max);
 906                 }
 907                 if (!sval_is_min(rl_min(right_orig))) {
 908                         left_true = remove_range(left_true, min, sub_one(rl_min(right_orig)));
 909                 }
 910                 if (sval_cmp(rl_min(right_orig), rl_max(right_orig)) == 0)
 911                         left_false = remove_range(left_orig, rl_min(right_orig), rl_min(right_orig));
 912
 913                 if (!sval_is_max(rl_max(left_orig)))
 914                         right_true = remove_range(right_true, add_one(rl_max(left_orig)), max);
 915                 if (!sval_is_min(rl_min(left_orig)))
 916                         right_true = remove_range(right_true, min, sub_one(rl_min(left_orig)));
 917                 if (sval_cmp(rl_min(left_orig), rl_max(left_orig)) == 0)
 918                         right_false = remove_range(right_orig, rl_min(left_orig), rl_min(left_orig));
 919                 break;
 920         case SPECIAL_UNSIGNED_GTE:
 921         case SPECIAL_GTE:
 922                 if (!sval_is_min(rl_min(right_orig)))
 923                         left_true = remove_range(left_orig, min, sub_one(rl_min(right_orig)));
 924                 left_false = remove_range(left_orig, rl_max(right_orig), max);
 925
 926                 if (!sval_is_max(rl_max(left_orig)))
 927                         right_true = remove_range(right_orig, add_one(rl_max(left_orig)), max);
 928                 right_false = remove_range(right_orig, min, rl_min(left_orig));
 929
 930                 if (sval_cmp(rl_min(left_orig), rl_min(right_orig)) == 0)
 931                         right_false = remove_range(right_false, rl_min(left_orig), rl_min(left_orig));
 932                 if (sval_cmp(rl_max(left_orig), rl_max(right_orig)) == 0)
 933                         left_false = remove_range(left_false, rl_max(left_orig), rl_max(left_orig));
 934                 break;
 935         case '>':
 936         case SPECIAL_UNSIGNED_GT:
 937                 left_true = remove_range(left_orig, min, rl_min(right_orig));
 938                 if (!sval_is_max(rl_max(right_orig)))
 939                         left_false = remove_range(left_orig, add_one(rl_max(right_orig)), max);
 940
 941                 right_true = remove_range(right_orig, rl_max(left_orig), max);
 942                 if (!sval_is_min(rl_min(left_orig)))
 943                         right_false = remove_range(right_orig, min, sub_one(rl_min(left_orig)));
 944                 break;
 945         case SPECIAL_NOTEQUAL:
 946                 if (!sval_is_max(rl_max(right_orig)))
 947                         left_false = remove_range(left_false, add_one(rl_max(right_orig)), max);
 948                 if (!sval_is_min(rl_min(right_orig)))
 949                         left_false = remove_range(left_false, min, sub_one(rl_min(right_orig)));
 950                 if (sval_cmp(rl_min(right_orig), rl_max(right_orig)) == 0)
 951                         left_true = remove_range(left_orig, rl_min(right_orig), rl_min(right_orig));
 952
 953                 if (!sval_is_max(rl_max(left_orig)))
 954                         right_false = remove_range(right_false, add_one(rl_max(left_orig)), max);
 955                 if (!sval_is_min(rl_min(left_orig)))
 956                         right_false = remove_range(right_false, min, sub_one(rl_min(left_orig)));
 957                 if (sval_cmp(rl_min(left_orig), rl_max(left_orig)) == 0)
 958                         right_true = remove_range(right_orig, rl_min(left_orig), rl_min(left_orig));
 959                 break;
 960         default:
 961                 return;
 962         }
 963
 964         left_true = rl_truncate_cast(get_type(left), left_true);
 965         left_false = rl_truncate_cast(get_type(left), left_false);
 966         right_true = rl_truncate_cast(get_type(right), right_true);
 967         right_false = rl_truncate_cast(get_type(right), right_false);
 968
 969         left_true_state = alloc_estate_rl(left_true);
 970         left_false_state = alloc_estate_rl(left_false);
 971         right_true_state = alloc_estate_rl(right_true);
 972         right_false_state = alloc_estate_rl(right_false);
 973
 974         switch (expr->op) {
 975         case '<':
 976         case SPECIAL_UNSIGNED_LT:
 977         case SPECIAL_UNSIGNED_LTE:
 978         case SPECIAL_LTE:
 979                 if (get_hard_max(right, &dummy))
 980                         estate_set_hard_max(left_true_state);
 981                 if (get_hard_max(left, &dummy))
 982                         estate_set_hard_max(right_false_state);
 983                 break;
 984         case '>':
 985         case SPECIAL_UNSIGNED_GT:
 986         case SPECIAL_UNSIGNED_GTE:
 987         case SPECIAL_GTE:
 988                 if (get_hard_max(left, &dummy))
 989                         estate_set_hard_max(right_true_state);
 990                 if (get_hard_max(right, &dummy))
 991                         estate_set_hard_max(left_false_state);
 992                 break;
 993         }
 994
 995         if (get_hard_max(left, &dummy)) {
 996                 estate_set_hard_max(left_true_state);
 997                 estate_set_hard_max(left_false_state);
 998         }
 999         if (get_hard_max(right, &dummy)) {
1000                 estate_set_hard_max(right_true_state);
1001                 estate_set_hard_max(right_false_state);
1002         }
1003
1004         if (left_postop == SPECIAL_INCREMENT) {
1005                 left_true_state = increment_state(left_true_state);
1006                 left_false_state = increment_state(left_false_state);
1007         }
1008         if (left_postop == SPECIAL_DECREMENT) {
1009                 left_true_state = decrement_state(left_true_state);
1010                 left_false_state = decrement_state(left_false_state);
1011         }
1012         if (right_postop == SPECIAL_INCREMENT) {
1013                 right_true_state = increment_state(right_true_state);
1014                 right_false_state = increment_state(right_false_state);
1015         }
1016         if (right_postop == SPECIAL_DECREMENT) {
1017                 right_true_state = decrement_state(right_true_state);
1018                 right_false_state = decrement_state(right_false_state);
1019         }
1020
1021         set_extra_expr_true_false(left, left_true_state, left_false_state);
1022         set_extra_expr_true_false(right, right_true_state, right_false_state);
1023 }
1024
1025 /* this is actually hooked from smatch_implied.c...  it's hacky, yes */
1026 void __extra_match_condition(struct expression *expr)
1027 {
1028         struct symbol *sym;
1029         char *name;
1030         struct smatch_state *pre_state;
1031         struct smatch_state *true_state;
1032         struct smatch_state *false_state;
1033
1034         expr = strip_expr(expr);
1035         switch (expr->type) {
1036         case EXPR_CALL:
1037                 function_comparison(SPECIAL_NOTEQUAL, expr, ll_to_sval(0), 1);
1038                 return;
1039         case EXPR_PREOP:
1040         case EXPR_SYMBOL:
1041         case EXPR_DEREF: {
1042                 sval_t zero;
1043
1044                 zero = sval_blank(expr);
1045                 zero.value = 0;
1046
1047                 name = expr_to_var_sym(expr, &sym);
1048                 if (!name)
1049                         return;
1050                 pre_state = get_state(my_id, name, sym);
1051                 true_state = estate_filter_sval(pre_state, zero);
1052                 if (possibly_true(expr, SPECIAL_EQUAL, zero_expr()))
1053                         false_state = alloc_estate_sval(zero);
1054                 else
1055                         false_state = alloc_estate_empty();
1056                 set_extra_true_false(name, sym, true_state, false_state);
1057                 free_string(name);
1058                 return;
1059         }
1060         case EXPR_COMPARE:
1061                 match_comparison(expr);
1062                 return;
1063         case EXPR_ASSIGNMENT:
1064                 __extra_match_condition(expr->left);
1065                 return;
1066         }
1067 }
1068
1069 /* returns 1 if it is not possible for expr to be value, otherwise returns 0 */
1070 int implied_not_equal(struct expression *expr, long long val)
1071 {
1072         return !possibly_false(expr, SPECIAL_NOTEQUAL, value_expr(val));
1073 }
1074
1075 static void struct_member_callback(struct expression *call, int param, char *printed_name, struct smatch_state *state)
1076 {
1077         if (estate_is_whole(state))
1078                 return;
1079         sql_insert_caller_info(call, PARAM_VALUE, param, printed_name, state->name);
1080 }
1081
1082 static void db_limited_before(void)
1083 {
1084         unmatched_slist = clone_slist(__get_cur_slist());
1085 }
1086
1087 static void db_limited_after(void)
1088 {
1089         free_slist(&unmatched_slist);
1090 }
1091
1092 static void db_param_limit_filter(struct expression *expr, int param, char *key, char *value)
1093 {
1094         struct expression *arg;
1095         char *name;
1096         struct symbol *sym;
1097         struct sm_state *sm;
1098         struct symbol *type;
1099         struct range_list *rl;
1100         struct range_list *limit;
1101         struct range_list *new;
1102
1103         while (expr->type == EXPR_ASSIGNMENT)
1104                 expr = strip_expr(expr->right);
1105         if (expr->type != EXPR_CALL)
1106                 return;
1107
1108         arg = get_argument_from_call_expr(expr->args, param);
1109         if (!arg)
1110                 return;
1111
1112         name = get_variable_from_key(arg, key, &sym);
1113         if (!name || !sym)
1114                 goto free;
1115
1116         sm = get_sm_state(SMATCH_EXTRA, name, sym);
1117         type = get_member_type_from_key(arg, key);
1118         if (sm)
1119                 rl = estate_rl(sm->state);
1120         else
1121                 rl = alloc_whole_rl(type);
1122
1123         str_to_rl(type, value, &limit);
1124         new = rl_intersection(rl, limit);
1125
1126         /* We want to preserve the implications here */
1127         if (sm && rl_equiv(estate_rl(sm->state), new))
1128                 __set_sm(sm);
1129         else
1130                 set_extra_nomod(name, sym, alloc_estate_rl(new));
1131
1132 free:
1133         free_string(name);
1134 }
1135
1136 static void db_param_add(struct expression *expr, int param, char *key, char *value)
1137 {
1138         struct expression *arg;
1139         char *name;
1140         struct symbol *sym;
1141         struct symbol *type;
1142         struct smatch_state *state;
1143         struct range_list *added = NULL;
1144         struct range_list *new;
1145
1146         while (expr->type == EXPR_ASSIGNMENT)
1147                 expr = strip_expr(expr->right);
1148         if (expr->type != EXPR_CALL)
1149                 return;
1150
1151         arg = get_argument_from_call_expr(expr->args, param);
1152         if (!arg)
1153                 return;
1154         name = get_variable_from_key(arg, key, &sym);
1155         if (!name || !sym)
1156                 goto free;
1157
1158         type = get_member_type_from_key(arg, key);
1159         state = get_state(SMATCH_EXTRA, name, sym);
1160         if (state) {
1161                 str_to_rl(type, value, &added);
1162                 new = rl_union(estate_rl(state), added);
1163         } else {
1164                 new = alloc_whole_rl(type);
1165         }
1166
1167         set_extra_mod(name, sym, alloc_estate_rl(new));
1168 free:
1169         free_string(name);
1170 }
1171
1172 static void db_returned_states_param(struct expression *expr, int param, char *key, char *value)
1173 {
1174         struct expression *arg;
1175         struct symbol *type;
1176         struct range_list *rl;
1177         char member_name[256];
1178         char *name;
1179         struct symbol *sym;
1180
1181         while (expr->type == EXPR_ASSIGNMENT)
1182                 expr = strip_expr(expr->right);
1183         if (expr->type != EXPR_CALL)
1184                 return;
1185         arg = get_argument_from_call_expr(expr->args, param);
1186         arg = strip_expr(arg);
1187         if (!arg)
1188                 return;
1189
1190         if (strcmp(key, "*$$") == 0) {
1191                 struct symbol *sym;
1192                 char buf[256];
1193                 char *name;
1194
1195                 if (arg->type == EXPR_PREOP && arg->op == '&') {
1196                         arg = strip_expr(arg->unop);
1197                         name = expr_to_var_sym(arg, &sym);
1198                 } else {
1199                         char *tmp = expr_to_var_sym(arg, &sym);
1200
1201                         if (!tmp)
1202                                 return;
1203                         snprintf(buf, sizeof(buf), "*%s", tmp);
1204                         name = alloc_string(buf);
1205                         free_string(tmp);
1206                 }
1207                 if (!name || !sym) {
1208                         free_string(name);
1209                         return;
1210                 }
1211                 type = get_type(arg);
1212                 str_to_rl(type, value, &rl);
1213                 set_extra_mod(name, sym, alloc_estate_rl(rl));
1214                 free_string(name);
1215                 return;
1216         }
1217
1218         if (arg->type == EXPR_PREOP && arg->op == '&') {
1219                 arg = strip_expr(arg->unop);
1220                 name = expr_to_var_sym(arg, &sym);
1221                 if (!name || !sym)
1222                         goto free;
1223                 snprintf(member_name, sizeof(member_name), "%s.%s", name, key + 4);
1224         } else {
1225                 name = expr_to_var_sym(arg, &sym);
1226                 if (!name || !sym)
1227                         goto free;
1228                 snprintf(member_name, sizeof(member_name), "%s%s", name, key + 2);
1229         }
1230         type = get_member_type_from_key(arg, key);
1231         if (!type)
1232                 goto free;
1233         str_to_rl(type, value, &rl);
1234         set_extra_mod(member_name, sym, alloc_estate_rl(rl));
1235 free:
1236         free_string(name);
1237 }
1238
1239 static void db_returned_member_info(struct expression *expr, int param, char *key, char *value)
1240 {
1241         struct symbol *type;
1242         struct symbol *sym;
1243         char *name;
1244         char member_name[256];
1245         struct range_list *rl;
1246
1247         if (expr->type != EXPR_ASSIGNMENT)
1248                 return;
1249
1250         name = expr_to_var_sym(expr->left, &sym);
1251         if (!name || !sym)
1252                 goto free;
1253         snprintf(member_name, sizeof(member_name), "%s%s", name, key + 2);
1254         type = get_member_type_from_key(expr->left, key);
1255         if (!type)
1256                 return;
1257         str_to_rl(type, value, &rl);
1258         set_extra_mod(member_name, sym, alloc_estate_rl(rl));
1259
1260 free:
1261         free_string(name);
1262 }
1263
1264 static void returned_member_callback(int return_id, char *return_ranges, char *printed_name, struct smatch_state *state)
1265 {
1266         if (estate_is_whole(state))
1267                 return;
1268
1269         sql_insert_return_states(return_id, return_ranges, RETURN_VALUE, -1,
1270                         printed_name, state->name);
1271 }
1272
1273 static void match_call_info(struct expression *expr)
1274 {
1275         struct range_list *rl = NULL;
1276         struct expression *arg;
1277         struct symbol *type;
1278         int i = 0;
1279
1280         FOR_EACH_PTR(expr->args, arg) {
1281                 type = get_arg_type(expr->fn, i);
1282
1283                 if (get_implied_rl(arg, &rl))
1284                         rl = cast_rl(type, rl);
1285                 else
1286                         rl = cast_rl(type, alloc_whole_rl(get_type(arg)));
1287
1288                 sql_insert_caller_info(expr, PARAM_VALUE, i, "$$", show_rl(rl));
1289                 i++;
1290         } END_FOR_EACH_PTR(arg);
1291 }
1292
1293 static void set_param_value(const char *name, struct symbol *sym, char *key, char *value)
1294 {
1295         struct range_list *rl = NULL;
1296         struct smatch_state *state;
1297         struct symbol *type;
1298         char fullname[256];
1299
1300         if (strcmp(key, "*$$") == 0)
1301                 snprintf(fullname, sizeof(fullname), "*%s", name);
1302         else if (strncmp(key, "$$", 2) == 0)
1303                 snprintf(fullname, 256, "%s%s", name, key + 2);
1304         else
1305                 return;
1306
1307         type = get_member_type_from_key(symbol_expression(sym), key);
1308         str_to_rl(type, value, &rl);
1309         state = alloc_estate_rl(rl);
1310         set_state(SMATCH_EXTRA, fullname, sym, state);
1311 }
1312
1313 void register_smatch_extra(int id)
1314 {
1315         my_id = id;
1316
1317         add_merge_hook(my_id, &merge_estates);
1318         add_unmatched_state_hook(my_id, &unmatched_state);
1319         add_hook(&match_function_def, FUNC_DEF_HOOK);
1320         add_hook(&match_declarations, DECLARATION_HOOK);
1321         add_definition_db_callback(set_param_value, PARAM_VALUE);
1322         add_db_return_states_callback(RETURN_VALUE, &db_returned_member_info);
1323         add_db_return_states_callback(PARAM_VALUE, &db_returned_states_param);
1324         add_db_return_states_before(&db_limited_before);
1325         add_db_return_states_callback(LIMITED_VALUE, &db_param_limit_filter);
1326         add_db_return_states_callback(FILTER_VALUE, &db_param_limit_filter);
1327         add_db_return_states_callback(ADDED_VALUE, &db_param_add);
1328         add_db_return_states_after(&db_limited_after);
1329 }
1330
1331 void register_smatch_extra_late(int id)
1332 {
1333         add_hook(&match_dereferences, DEREF_HOOK);
1334         add_hook(&match_pointer_as_array, OP_HOOK);
1335         add_db_fn_call_callback(DEREFERENCE, &set_param_dereferenced);
1336         add_indirect_modification_hook(SMATCH_EXTRA, reset_struct_members);
1337         if (option_no_db)
1338                 add_hook(&match_function_call, FUNCTION_CALL_HOOK);
1339         add_hook(&match_assign, ASSIGNMENT_HOOK);
1340         add_hook(&unop_expr, OP_HOOK);
1341         add_hook(&asm_expr, ASM_HOOK);
1342
1343         add_hook(&match_call_info, FUNCTION_CALL_HOOK);
1344         add_member_info_callback(my_id, struct_member_callback);
1345         add_returned_member_callback(my_id, returned_member_callback);
1346 }