smatch_db.c

   1 /*
   2  * smatch/smatch_db.c
   3  *
   4  * Copyright (C) 2010 Dan Carpenter.
   5  *
   6  * Licensed under the Open Software License version 1.1
   7  *
   8  */
   9
  10 #include <string.h>
  11 #include <errno.h>
  12 #include <sqlite3.h>
  13 #include "smatch.h"
  14 #include "smatch_slist.h"
  15 #include "smatch_extra.h"
  16
  17 #define sql_insert(table, values...)                                            \
  18 do {                                                                            \
  19         if (option_info) {                                                      \
  20                 sm_prefix();                                                    \
  21                 sm_printf("SQL: insert into " #table " values (" values);       \
  22                 sm_printf(");\n");                                              \
  23         }                                                                       \
  24 } while (0)
  25
  26 static sqlite3 *db;
  27
  28 struct def_callback {
  29         int hook_type;
  30         void (*callback)(const char *name, struct symbol *sym, char *key, char *value);
  31 };
  32 ALLOCATOR(def_callback, "definition db hook callbacks");
  33 DECLARE_PTR_LIST(callback_list, struct def_callback);
  34 static struct callback_list *callbacks;
  35
  36 struct member_info_callback {
  37         int owner;
  38         void (*callback)(char *fn, char *global_static, int param, char *printed_name, struct smatch_state *state);
  39 };
  40 ALLOCATOR(member_info_callback, "caller_info callbacks");
  41 DECLARE_PTR_LIST(member_info_cb_list, struct member_info_callback);
  42 static struct member_info_cb_list *member_callbacks;
  43
  44 struct returned_state_callback {
  45         void (*callback)(int return_id, char *return_ranges, struct expression *return_expr, struct state_list *slist);
  46 };
  47 ALLOCATOR(returned_state_callback, "returned state callbacks");
  48 DECLARE_PTR_LIST(returned_state_cb_list, struct returned_state_callback);
  49 static struct returned_state_cb_list *returned_state_callbacks;
  50
  51 struct returned_member_callback {
  52         int owner;
  53         void (*callback)(int return_id, char *return_ranges, char *printed_name, struct smatch_state *state);
  54 };
  55 ALLOCATOR(returned_member_callback, "returned member callbacks");
  56 DECLARE_PTR_LIST(returned_member_cb_list, struct returned_member_callback);
  57 static struct returned_member_cb_list *returned_member_callbacks;
  58
  59 struct call_implies_callback {
  60         int type;
  61         void (*callback)(struct expression *arg, char *value);
  62 };
  63 ALLOCATOR(call_implies_callback, "call_implies callbacks");
  64 DECLARE_PTR_LIST(call_implies_cb_list, struct call_implies_callback);
  65 static struct call_implies_cb_list *call_implies_cb_list;
  66
  67 void sql_exec(int (*callback)(void*, int, char**, char**), const char *sql)
  68 {
  69         char *err = NULL;
  70         int rc;
  71
  72         if (option_no_db || !db)
  73                 return;
  74
  75         rc = sqlite3_exec(db, sql, callback, 0, &err);
  76         if (rc != SQLITE_OK) {
  77                 fprintf(stderr, "SQL error #2: %s\n", err);
  78                 fprintf(stderr, "SQL: '%s'\n", sql);
  79         }
  80 }
  81
  82 void sql_insert_return_states(int return_id, const char *return_ranges,
  83                 int type, int param, const char *key, const char *value)
  84 {
  85         sql_insert(return_states, "'%s', '%s', %d, '%s', %d, %d, %d, '%s', '%s'",
  86                    get_filename(), get_function(), return_id, return_ranges,
  87                    fn_static(), type, param, key, value);
  88 }
  89
  90 void add_definition_db_callback(void (*callback)(const char *name, struct symbol *sym, char *key, char *value), int type)
  91 {
  92         struct def_callback *def_callback = __alloc_def_callback(0);
  93
  94         def_callback->hook_type = type;
  95         def_callback->callback = callback;
  96         add_ptr_list(&callbacks, def_callback);
  97 }
  98
  99 /*
 100  * These call backs are used when the --info option is turned on to print struct
 101  * member information.  For example foo->bar could have a state in
 102  * smatch_extra.c and also check_user.c.
 103  */
 104 void add_member_info_callback(int owner, void (*callback)(char *fn, char *global_static, int param, char *printed_name, struct smatch_state *state))
 105 {
 106         struct member_info_callback *member_callback = __alloc_member_info_callback(0);
 107
 108         member_callback->owner = owner;
 109         member_callback->callback = callback;
 110         add_ptr_list(&member_callbacks, member_callback);
 111 }
 112
 113 void add_returned_state_callback(void (*fn)(int return_id, char *return_ranges, struct expression *returned_expr, struct state_list *slist))
 114 {
 115         struct returned_state_callback *callback = __alloc_returned_state_callback(0);
 116
 117         callback->callback = fn;
 118         add_ptr_list(&returned_state_callbacks, callback);
 119 }
 120
 121 void add_returned_member_callback(int owner, void (*callback)(int return_id, char *return_ranges, char *printed_name, struct smatch_state *state))
 122 {
 123         struct returned_member_callback *member_callback = __alloc_returned_member_callback(0);
 124
 125         member_callback->owner = owner;
 126         member_callback->callback = callback;
 127         add_ptr_list(&returned_member_callbacks, member_callback);
 128 }
 129
 130 void add_db_fn_call_callback(int type, void (*callback)(struct expression *arg, char *value))
 131 {
 132         struct call_implies_callback *cb = __alloc_call_implies_callback(0);
 133
 134         cb->type = type;
 135         cb->callback = callback;
 136         add_ptr_list(&call_implies_cb_list, cb);
 137 }
 138
 139 static struct symbol *return_type;
 140 static struct range_list *return_range_list;
 141 static int db_return_callback(void *unused, int argc, char **argv, char **azColName)
 142 {
 143         if (argc != 1)
 144                 return 0;
 145         if (option_debug)
 146                 sm_msg("return type %d", type_positive_bits(return_type));
 147         str_to_rl(return_type, argv[0], &return_range_list);
 148         return 0;
 149 }
 150
 151 struct range_list *db_return_vals(struct expression *expr)
 152 {
 153         struct symbol *sym;
 154         static char sql_filter[1024];
 155
 156         if (expr->type != EXPR_CALL)
 157                 return NULL;
 158         if (expr->fn->type != EXPR_SYMBOL)
 159                 return NULL;
 160         return_type = get_type(expr);
 161         if (!return_type)
 162                 return NULL;
 163         sym = expr->fn->symbol;
 164         if (!sym)
 165                 return NULL;
 166
 167         if (sym->ctype.modifiers & MOD_STATIC) {
 168                 snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
 169                          get_filename(), sym->ident->name);
 170         } else {
 171                 snprintf(sql_filter, 1024, "function = '%s' and static = 0;",
 172                                 sym->ident->name);
 173         }
 174
 175         return_range_list = NULL;
 176         run_sql(db_return_callback, "select return from return_values where %s",
 177                  sql_filter);
 178         return return_range_list;
 179 }
 180
 181 static void match_call_hack(struct expression *expr)
 182 {
 183         char *name;
 184
 185         /*
 186          * we just want to record something in the database so that if we have
 187          * two calls like:  frob(4); frob(some_unkown); then on the receiving
 188          * side we know that sometimes frob is called with unknown parameters.
 189          */
 190
 191         name = get_fnptr_name(expr->fn);
 192         if (!name)
 193                 return;
 194         sm_msg("info: call_marker '%s' %s", name, is_static(expr->fn) ? "static" : "global");
 195         free_string(name);
 196 }
 197
 198 static void print_struct_members(char *fn, char *global_static, struct expression *expr, int param, struct state_list *slist,
 199         void (*callback)(char *fn, char *global_static, int param, char *printed_name, struct smatch_state *state))
 200 {
 201         struct sm_state *sm;
 202         char *name;
 203         struct symbol *sym;
 204         int len;
 205         char printed_name[256];
 206         int is_address = 0;
 207
 208         expr = strip_expr(expr);
 209         if (expr->type == EXPR_PREOP && expr->op == '&') {
 210                 expr = strip_expr(expr->unop);
 211                 is_address = 1;
 212         }
 213
 214         name = expr_to_var_sym(expr, &sym);
 215         if (!name || !sym)
 216                 goto free;
 217
 218         len = strlen(name);
 219         FOR_EACH_PTR(slist, sm) {
 220                 if (sm->sym != sym)
 221                         continue;
 222                 if (strncmp(name, sm->name, len) || sm->name[len] == '\0')
 223                         continue;
 224                 if (is_address)
 225                         snprintf(printed_name, sizeof(printed_name), "$$->%s", sm->name + len + 1);
 226                 else
 227                         snprintf(printed_name, sizeof(printed_name), "$$%s", sm->name + len);
 228                 callback(fn, global_static, param, printed_name, sm->state);
 229         } END_FOR_EACH_PTR(sm);
 230 free:
 231         free_string(name);
 232 }
 233
 234 static void match_call_info(struct expression *expr)
 235 {
 236         struct member_info_callback *cb;
 237         struct expression *arg;
 238         struct state_list *slist;
 239         char *name;
 240         int i;
 241         char *gs;
 242
 243         name = get_fnptr_name(expr->fn);
 244         if (!name)
 245                 return;
 246
 247         if (is_static(expr->fn))
 248                 gs = (char *)"static";
 249         else
 250                 gs = (char *)"global";
 251
 252         FOR_EACH_PTR(member_callbacks, cb) {
 253                 slist = get_all_states(cb->owner);
 254                 i = 0;
 255                 FOR_EACH_PTR(expr->args, arg) {
 256                         print_struct_members(name, gs, arg, i, slist, cb->callback);
 257                         i++;
 258                 } END_FOR_EACH_PTR(arg);
 259                 free_slist(&slist);
 260         } END_FOR_EACH_PTR(cb);
 261
 262         free_string(name);
 263 }
 264
 265 static int get_param(int param, char **name, struct symbol **sym)
 266 {
 267         struct symbol *arg;
 268         int i;
 269
 270         i = 0;
 271         FOR_EACH_PTR(cur_func_sym->ctype.base_type->arguments, arg) {
 272                 /*
 273                  * this is a temporary hack to work around a bug (I think in sparse?)
 274                  * 2.6.37-rc1:fs/reiserfs/journal.o
 275                  * If there is a function definition without parameter name found
 276                  * after a function implementation then it causes a crash.
 277                  * int foo() {}
 278                  * int bar(char *);
 279                  */
 280                 if (arg->ident->name < (char *)100)
 281                         continue;
 282                 if (i == param && arg->ident->name) {
 283                         *name = arg->ident->name;
 284                         *sym = arg;
 285                         return TRUE;
 286                 }
 287                 i++;
 288         } END_FOR_EACH_PTR(arg);
 289
 290         return FALSE;
 291 }
 292
 293 static struct state_list *final_states;
 294 static int prev_func_id = -1;
 295 static int db_callback(void *unused, int argc, char **argv, char **azColName)
 296 {
 297         int func_id;
 298         long type;
 299         long param;
 300         char *name = NULL;
 301         struct symbol *sym = NULL;
 302         struct def_callback *def_callback;
 303
 304         if (argc != 5)
 305                 return 0;
 306
 307         func_id = atoi(argv[0]);
 308         errno = 0;
 309         type = strtol(argv[1], NULL, 10);
 310         param = strtol(argv[2], NULL, 10);
 311         if (errno)
 312                 return 0;
 313
 314         if (prev_func_id == -1)
 315                 prev_func_id = func_id;
 316         if (func_id != prev_func_id) {
 317                 merge_slist(&final_states, __pop_fake_cur_slist());
 318                 __push_fake_cur_slist();
 319                 __unnullify_path();
 320                 prev_func_id = func_id;
 321         }
 322
 323         if (type == INTERNAL)
 324                 return 0;
 325         if (param >= 0 && !get_param(param, &name, &sym))
 326                 return 0;
 327
 328         FOR_EACH_PTR(callbacks, def_callback) {
 329                 if (def_callback->hook_type == type)
 330                         def_callback->callback(name, sym, argv[3], argv[4]);
 331         } END_FOR_EACH_PTR(def_callback);
 332
 333         return 0;
 334 }
 335
 336 static void get_direct_callers(struct symbol *sym)
 337 {
 338         char sql_filter[1024];
 339
 340         if (sym->ctype.modifiers & MOD_STATIC) {
 341                 snprintf(sql_filter, 1024,
 342                          "file = '%s' and function = '%s' order by function_id;",
 343                          get_filename(), sym->ident->name);
 344         } else {
 345                 snprintf(sql_filter, 1024,
 346                          "function = '%s' and static = 0 order by function_id;",
 347                          sym->ident->name);
 348         }
 349
 350         run_sql(db_callback, "select function_id, type, parameter, key, value from caller_info"
 351                 " where %s", sql_filter);
 352 }
 353
 354 static char *ptr_name;
 355 static int get_ptr_name(void *unused, int argc, char **argv, char **azColName)
 356 {
 357         if (!ptr_name)
 358                 ptr_name = alloc_string(argv[0]);
 359         return 0;
 360 }
 361
 362 static void get_function_pointer_callers(struct symbol *sym)
 363 {
 364         char sql_filter[1024];
 365
 366         if (sym->ctype.modifiers & MOD_STATIC) {
 367                 snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
 368                          get_filename(), sym->ident->name);
 369         } else {
 370                 snprintf(sql_filter, 1024, "function = '%s';",
 371                          sym->ident->name);
 372         }
 373
 374         ptr_name = NULL;
 375         run_sql(get_ptr_name, "select ptr from function_ptr where %s", sql_filter);
 376         if (!ptr_name)
 377                 return;
 378
 379         run_sql(db_callback, "select function_id, type, parameter, key, value from caller_info"
 380                 " where function = '%s' order by function_id", ptr_name);
 381
 382         free_string(ptr_name);
 383 }
 384
 385 static void match_data_from_db(struct symbol *sym)
 386 {
 387         struct sm_state *sm;
 388
 389         if (!sym || !sym->ident || !sym->ident->name)
 390                 return;
 391
 392         __push_fake_cur_slist();
 393         __unnullify_path();
 394         prev_func_id = -1;
 395
 396         get_direct_callers(sym);
 397         get_function_pointer_callers(sym);
 398
 399         merge_slist(&final_states, __pop_fake_cur_slist());
 400
 401         FOR_EACH_PTR(final_states, sm) {
 402                 __set_sm(sm);
 403         } END_FOR_EACH_PTR(sm);
 404
 405         free_slist(&final_states);
 406 }
 407
 408 static void match_function_assign(struct expression *expr)
 409 {
 410         struct expression *right = expr->right;
 411         struct symbol *sym;
 412         char *fn_name;
 413         char *ptr_name;
 414
 415         if (right->type == EXPR_PREOP && right->op == '&')
 416                 right = strip_expr(right->unop);
 417         if (right->type != EXPR_SYMBOL)
 418                 return;
 419         sym = get_type(right);
 420         if (!sym || sym->type != SYM_FN)
 421                 return;
 422
 423         fn_name = expr_to_var(right);
 424         ptr_name = get_fnptr_name(expr->left);
 425         if (!fn_name || !ptr_name)
 426                 goto free;
 427
 428         sm_msg("info: sets_fn_ptr '%s' '%s'", ptr_name, fn_name);
 429
 430 free:
 431         free_string(fn_name);
 432         free_string(ptr_name);
 433 }
 434
 435 static struct expression *call_implies_call_expr;
 436 static int call_implies_callbacks(void *unused, int argc, char **argv, char **azColName)
 437 {
 438         struct call_implies_callback *cb;
 439         struct expression *arg = NULL;
 440         int type;
 441         int param;
 442
 443         if (argc != 4)
 444                 return 0;
 445
 446         type = atoi(argv[1]);
 447         param = atoi(argv[2]);
 448
 449         FOR_EACH_PTR(call_implies_cb_list, cb) {
 450                 if (cb->type != type)
 451                         continue;
 452                 if (param != -1) {
 453                         arg = get_argument_from_call_expr(call_implies_call_expr->args, param);
 454                         if (!arg)
 455                                 continue;
 456                 }
 457                 cb->callback(arg, argv[3]);
 458         } END_FOR_EACH_PTR(cb);
 459
 460         return 0;
 461 }
 462
 463 static void match_call_implies(struct expression *expr)
 464 {
 465         struct symbol *sym;
 466         static char sql_filter[1024];
 467
 468         if (expr->fn->type != EXPR_SYMBOL)
 469                 return;
 470         sym = expr->fn->symbol;
 471         if (!sym)
 472                 return;
 473
 474         if (sym->ctype.modifiers & MOD_STATIC) {
 475                 snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
 476                          get_filename(), sym->ident->name);
 477         } else {
 478                 snprintf(sql_filter, 1024, "function = '%s' and static = 0;",
 479                                 sym->ident->name);
 480         }
 481
 482         call_implies_call_expr = expr;
 483         run_sql(call_implies_callbacks,
 484                 "select function, type, parameter, value from call_implies where %s",
 485                 sql_filter);
 486         return;
 487 }
 488
 489 static void print_initializer_list(struct expression_list *expr_list,
 490                 struct symbol *struct_type)
 491 {
 492         struct expression *expr;
 493         struct symbol *base_type;
 494
 495         FOR_EACH_PTR(expr_list, expr) {
 496                 if (expr->type == EXPR_INDEX && expr->idx_expression && expr->idx_expression->type == EXPR_INITIALIZER) {
 497                         print_initializer_list(expr->idx_expression->expr_list, struct_type);
 498                         continue;
 499                 }
 500                 if (expr->type != EXPR_IDENTIFIER)
 501                         continue;
 502                 if (!expr->expr_ident)
 503                         continue;
 504                 if (!expr->ident_expression || !expr->ident_expression->symbol_name)
 505                         continue;
 506                 base_type = get_type(expr->ident_expression);
 507                 if (!base_type || base_type->type != SYM_FN)
 508                         continue;
 509                 sm_msg("info: sets_fn_ptr '(struct %s)->%s' '%s'", struct_type->ident->name,
 510                        expr->expr_ident->name,
 511                        expr->ident_expression->symbol_name->name);
 512         } END_FOR_EACH_PTR(expr);
 513 }
 514
 515 static void global_variable(struct symbol *sym)
 516 {
 517         struct symbol *struct_type;
 518
 519         if (!sym->ident)
 520                 return;
 521         if (!sym->initializer || sym->initializer->type != EXPR_INITIALIZER)
 522                 return;
 523         struct_type = get_base_type(sym);
 524         if (!struct_type)
 525                 return;
 526         if (struct_type->type == SYM_ARRAY) {
 527                 struct_type = get_base_type(struct_type);
 528                 if (!struct_type)
 529                         return;
 530         }
 531         if (struct_type->type != SYM_STRUCT || !struct_type->ident)
 532                 return;
 533         print_initializer_list(sym->initializer->expr_list, struct_type);
 534 }
 535
 536 static void match_return_info(int return_id, char *return_ranges, struct expression *expr, struct state_list *slist)
 537 {
 538         sm_msg("info: return_marker %d '%s' %s", return_id, return_ranges,
 539                global_static());
 540 }
 541
 542 static int return_id;
 543 static void match_function_def(struct symbol *sym)
 544 {
 545         return_id = 0;
 546 }
 547
 548 static void call_return_state_hooks_compare(struct expression *expr)
 549 {
 550         struct returned_state_callback *cb;
 551         struct state_list *slist;
 552         char *return_ranges;
 553         int final_pass_orig = final_pass;
 554
 555         __push_fake_cur_slist();
 556
 557         final_pass = 0;
 558         __split_whole_condition(expr);
 559         final_pass = final_pass_orig;
 560
 561         return_ranges = alloc_sname("1");
 562
 563         return_id++;
 564         slist = __get_cur_slist();
 565         FOR_EACH_PTR(returned_state_callbacks, cb) {
 566                 cb->callback(return_id, return_ranges, expr, slist);
 567         } END_FOR_EACH_PTR(cb);
 568
 569         __push_true_states();
 570         __use_false_states();
 571
 572         return_ranges = alloc_sname("0");;
 573         return_id++;
 574         slist = __get_cur_slist();
 575         FOR_EACH_PTR(returned_state_callbacks, cb) {
 576                 cb->callback(return_id, return_ranges, expr, slist);
 577         } END_FOR_EACH_PTR(cb);
 578
 579         __merge_true_states();
 580         __pop_fake_cur_slist();
 581 }
 582
 583 static int call_return_state_hooks_split_possible(struct expression *expr)
 584 {
 585         struct returned_state_callback *cb;
 586         struct state_list *slist;
 587         struct range_list *rl;
 588         char *return_ranges;
 589         struct sm_state *sm;
 590         struct sm_state *tmp;
 591         int ret = 0;
 592         int nr_possible, nr_states;
 593
 594         sm = get_sm_state_expr(SMATCH_EXTRA, expr);
 595         if (!sm || !sm->merged)
 596                 return 0;
 597
 598         /* bail if it gets too complicated */
 599         nr_possible = ptr_list_size((struct ptr_list *)sm->possible);
 600         nr_states = ptr_list_size((struct ptr_list *)__get_cur_slist());
 601         if (nr_possible >= 100)
 602                 return 0;
 603         if (nr_states * nr_possible >= 1000)
 604                 return 0;
 605
 606         FOR_EACH_PTR(sm->possible, tmp) {
 607                 if (tmp->merged)
 608                         continue;
 609
 610                 ret = 1;
 611                 __push_fake_cur_slist();
 612
 613                 overwrite_states_using_pool(tmp);
 614
 615                 rl = cast_rl(cur_func_return_type(), estate_rl(tmp->state));
 616                 return_ranges = show_rl(rl);
 617
 618                 return_id++;
 619                 slist = __get_cur_slist();
 620                 FOR_EACH_PTR(returned_state_callbacks, cb) {
 621                         cb->callback(return_id, return_ranges, expr, slist);
 622                 } END_FOR_EACH_PTR(cb);
 623
 624                 __pop_fake_cur_slist();
 625         } END_FOR_EACH_PTR(tmp);
 626
 627         return ret;
 628 }
 629
 630 static void call_return_state_hooks(struct expression *expr)
 631 {
 632         struct returned_state_callback *cb;
 633         struct state_list *slist;
 634         struct range_list *rl;
 635         char *return_ranges;
 636         int nr_states;
 637
 638         expr = strip_expr(expr);
 639
 640         if (!expr) {
 641                 return_ranges = alloc_sname("");
 642         } else if (is_condition(expr)) {
 643                 call_return_state_hooks_compare(expr);
 644                 return;
 645         } else if (call_return_state_hooks_split_possible(expr)) {
 646                 return;
 647         } else if (get_implied_rl(expr, &rl)) {
 648                 rl = cast_rl(cur_func_return_type(), rl);
 649                 return_ranges = show_rl(rl);
 650         } else {
 651                 rl = alloc_whole_rl(cur_func_return_type());
 652                 return_ranges = show_rl(rl);
 653         }
 654
 655         return_id++;
 656         slist = __get_cur_slist();
 657         nr_states = ptr_list_size((struct ptr_list *)__get_cur_slist());
 658         FOR_EACH_PTR(returned_state_callbacks, cb) {
 659                 if (nr_states < 10000)
 660                         cb->callback(return_id, return_ranges, expr, slist);
 661                 else
 662                         cb->callback(return_id, return_ranges, expr, NULL);
 663         } END_FOR_EACH_PTR(cb);
 664 }
 665
 666 static void print_returned_struct_members(int return_id, char *return_ranges, struct expression *expr, struct state_list *slist)
 667 {
 668         struct returned_member_callback *cb;
 669         struct state_list *my_slist;
 670         struct sm_state *sm;
 671         struct symbol *type;
 672         char *name;
 673         char member_name[256];
 674         int len;
 675
 676         type = get_type(expr);
 677         if (!type || type->type != SYM_PTR)
 678                 return;
 679         type = get_real_base_type(type);
 680         if (!type || type->type != SYM_STRUCT)
 681                 return;
 682         name = expr_to_var(expr);
 683         if (!name)
 684                 return;
 685
 686         member_name[sizeof(member_name) - 1] = '\0';
 687         strcpy(member_name, "$$");
 688
 689         len = strlen(name);
 690         FOR_EACH_PTR(returned_member_callbacks, cb) {
 691                 my_slist = get_all_states_slist(cb->owner, slist);
 692                 FOR_EACH_PTR(my_slist, sm) {
 693                         if (strncmp(sm->name, name, len) != 0)
 694                                 continue;
 695                         if (strncmp(sm->name + len, "->", 2) != 0)
 696                                 continue;
 697                         strncpy(member_name + 2, sm->name + len, sizeof(member_name) - 2);
 698                         cb->callback(return_id, return_ranges, member_name, sm->state);
 699                 } END_FOR_EACH_PTR(sm);
 700                 free_slist(&my_slist);
 701         } END_FOR_EACH_PTR(cb);
 702
 703         free_string(name);
 704 }
 705
 706 static void match_end_func_info(struct symbol *sym)
 707 {
 708         if (__path_is_null())
 709                 return;
 710         call_return_state_hooks(NULL);
 711 }
 712
 713 void open_smatch_db(void)
 714 {
 715 #ifdef SQLITE_OPEN_READONLY
 716         int rc;
 717
 718         if (option_no_db)
 719                 return;
 720
 721         rc = sqlite3_open_v2("smatch_db.sqlite", &db, SQLITE_OPEN_READONLY, NULL);
 722         if (rc != SQLITE_OK) {
 723                 option_no_db = 1;
 724                 return;
 725         }
 726         return;
 727 #else
 728         option_no_db = 1;
 729         return;
 730 #endif
 731 }
 732
 733 void register_definition_db_callbacks(int id)
 734 {
 735         add_hook(&match_function_def, FUNC_DEF_HOOK);
 736
 737         if (option_info) {
 738                 add_hook(&match_call_info, FUNCTION_CALL_HOOK);
 739                 add_hook(&match_call_hack, FUNCTION_CALL_HOOK);
 740                 add_hook(&match_function_assign, ASSIGNMENT_HOOK);
 741                 add_hook(&match_function_assign, GLOBAL_ASSIGNMENT_HOOK);
 742                 add_hook(&global_variable, BASE_HOOK);
 743                 add_hook(&global_variable, DECLARATION_HOOK);
 744                 add_returned_state_callback(match_return_info);
 745                 add_returned_state_callback(print_returned_struct_members);
 746                 add_hook(&call_return_state_hooks, RETURN_HOOK);
 747                 add_hook(&match_end_func_info, END_FUNC_HOOK);
 748         }
 749
 750         if (option_no_db)
 751                 return;
 752
 753         add_hook(&match_data_from_db, FUNC_DEF_HOOK);
 754         add_hook(&match_call_implies, FUNCTION_CALL_HOOK);
 755 }
 756
 757 char *get_variable_from_key(struct expression *arg, char *key, struct symbol **sym)
 758 {
 759         char buf[256];
 760         char *tmp;
 761
 762         if (strcmp(key, "$$") == 0)
 763                 return expr_to_var_sym(arg, sym);
 764
 765         if (strcmp(key, "*$$") == 0) {
 766                 if (arg->type == EXPR_PREOP && arg->op == '&') {
 767                         arg = strip_expr(arg->unop);
 768                         return expr_to_var_sym(arg, sym);
 769                 } else {
 770                         tmp = expr_to_var_sym(arg, sym);
 771                         if (!tmp)
 772                                 return NULL;
 773                         snprintf(buf, sizeof(buf), "*%s", tmp);
 774                         free_string(tmp);
 775                         return alloc_string(buf);
 776                 }
 777         }
 778
 779         if (arg->type == EXPR_PREOP && arg->op == '&') {
 780                 arg = strip_expr(arg->unop);
 781                 tmp = expr_to_var_sym(arg, sym);
 782                 if (!tmp)
 783                         return NULL;
 784                 snprintf(buf, sizeof(buf), "%s.%s", tmp, key + 4);
 785                 return alloc_string(buf);
 786         }
 787
 788         tmp = expr_to_var_sym(arg, sym);
 789         if (!tmp)
 790                 return NULL;
 791         snprintf(buf, sizeof(buf), "%s%s", tmp, key + 2);
 792         free_string(tmp);
 793         return alloc_string(buf);
 794 }
 795
 796