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 sql_insert_function_ptr(const char *fn, const char *struct_name)
  91 {
  92         sql_insert(function_ptr, "'%s', '%s', '%s'", get_filename(), fn,
  93                    struct_name);
  94 }
  95
  96 void add_definition_db_callback(void (*callback)(const char *name, struct symbol *sym, char *key, char *value), int type)
  97 {
  98         struct def_callback *def_callback = __alloc_def_callback(0);
  99
 100         def_callback->hook_type = type;
 101         def_callback->callback = callback;
 102         add_ptr_list(&callbacks, def_callback);
 103 }
 104
 105 /*
 106  * These call backs are used when the --info option is turned on to print struct
 107  * member information.  For example foo->bar could have a state in
 108  * smatch_extra.c and also check_user.c.
 109  */
 110 void add_member_info_callback(int owner, void (*callback)(char *fn, char *global_static, int param, char *printed_name, struct smatch_state *state))
 111 {
 112         struct member_info_callback *member_callback = __alloc_member_info_callback(0);
 113
 114         member_callback->owner = owner;
 115         member_callback->callback = callback;
 116         add_ptr_list(&member_callbacks, member_callback);
 117 }
 118
 119 void add_returned_state_callback(void (*fn)(int return_id, char *return_ranges, struct expression *returned_expr, struct state_list *slist))
 120 {
 121         struct returned_state_callback *callback = __alloc_returned_state_callback(0);
 122
 123         callback->callback = fn;
 124         add_ptr_list(&returned_state_callbacks, callback);
 125 }
 126
 127 void add_returned_member_callback(int owner, void (*callback)(int return_id, char *return_ranges, char *printed_name, struct smatch_state *state))
 128 {
 129         struct returned_member_callback *member_callback = __alloc_returned_member_callback(0);
 130
 131         member_callback->owner = owner;
 132         member_callback->callback = callback;
 133         add_ptr_list(&returned_member_callbacks, member_callback);
 134 }
 135
 136 void add_db_fn_call_callback(int type, void (*callback)(struct expression *arg, char *value))
 137 {
 138         struct call_implies_callback *cb = __alloc_call_implies_callback(0);
 139
 140         cb->type = type;
 141         cb->callback = callback;
 142         add_ptr_list(&call_implies_cb_list, cb);
 143 }
 144
 145 static struct symbol *return_type;
 146 static struct range_list *return_range_list;
 147 static int db_return_callback(void *unused, int argc, char **argv, char **azColName)
 148 {
 149         if (argc != 1)
 150                 return 0;
 151         if (option_debug)
 152                 sm_msg("return type %d", type_positive_bits(return_type));
 153         str_to_rl(return_type, argv[0], &return_range_list);
 154         return 0;
 155 }
 156
 157 struct range_list *db_return_vals(struct expression *expr)
 158 {
 159         struct symbol *sym;
 160         static char sql_filter[1024];
 161
 162         if (expr->type != EXPR_CALL)
 163                 return NULL;
 164         if (expr->fn->type != EXPR_SYMBOL)
 165                 return NULL;
 166         return_type = get_type(expr);
 167         if (!return_type)
 168                 return NULL;
 169         sym = expr->fn->symbol;
 170         if (!sym)
 171                 return NULL;
 172
 173         if (sym->ctype.modifiers & MOD_STATIC) {
 174                 snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
 175                          get_filename(), sym->ident->name);
 176         } else {
 177                 snprintf(sql_filter, 1024, "function = '%s' and static = 0;",
 178                                 sym->ident->name);
 179         }
 180
 181         return_range_list = NULL;
 182         run_sql(db_return_callback, "select return from return_values where %s",
 183                  sql_filter);
 184         return return_range_list;
 185 }
 186
 187 static void match_call_hack(struct expression *expr)
 188 {
 189         char *name;
 190
 191         /*
 192          * we just want to record something in the database so that if we have
 193          * two calls like:  frob(4); frob(some_unkown); then on the receiving
 194          * side we know that sometimes frob is called with unknown parameters.
 195          */
 196
 197         name = get_fnptr_name(expr->fn);
 198         if (!name)
 199                 return;
 200         sm_msg("info: call_marker '%s' %s", name, is_static(expr->fn) ? "static" : "global");
 201         free_string(name);
 202 }
 203
 204 static void print_struct_members(char *fn, char *global_static, struct expression *expr, int param, struct state_list *slist,
 205         void (*callback)(char *fn, char *global_static, int param, char *printed_name, struct smatch_state *state))
 206 {
 207         struct sm_state *sm;
 208         char *name;
 209         struct symbol *sym;
 210         int len;
 211         char printed_name[256];
 212         int is_address = 0;
 213
 214         expr = strip_expr(expr);
 215         if (expr->type == EXPR_PREOP && expr->op == '&') {
 216                 expr = strip_expr(expr->unop);
 217                 is_address = 1;
 218         }
 219
 220         name = expr_to_var_sym(expr, &sym);
 221         if (!name || !sym)
 222                 goto free;
 223
 224         len = strlen(name);
 225         FOR_EACH_PTR(slist, sm) {
 226                 if (sm->sym != sym)
 227                         continue;
 228                 if (strncmp(name, sm->name, len) || sm->name[len] == '\0')
 229                         continue;
 230                 if (is_address)
 231                         snprintf(printed_name, sizeof(printed_name), "$$->%s", sm->name + len + 1);
 232                 else
 233                         snprintf(printed_name, sizeof(printed_name), "$$%s", sm->name + len);
 234                 callback(fn, global_static, param, printed_name, sm->state);
 235         } END_FOR_EACH_PTR(sm);
 236 free:
 237         free_string(name);
 238 }
 239
 240 static void match_call_info(struct expression *expr)
 241 {
 242         struct member_info_callback *cb;
 243         struct expression *arg;
 244         struct state_list *slist;
 245         char *name;
 246         int i;
 247         char *gs;
 248
 249         name = get_fnptr_name(expr->fn);
 250         if (!name)
 251                 return;
 252
 253         if (is_static(expr->fn))
 254                 gs = (char *)"static";
 255         else
 256                 gs = (char *)"global";
 257
 258         FOR_EACH_PTR(member_callbacks, cb) {
 259                 slist = get_all_states(cb->owner);
 260                 i = 0;
 261                 FOR_EACH_PTR(expr->args, arg) {
 262                         print_struct_members(name, gs, arg, i, slist, cb->callback);
 263                         i++;
 264                 } END_FOR_EACH_PTR(arg);
 265                 free_slist(&slist);
 266         } END_FOR_EACH_PTR(cb);
 267
 268         free_string(name);
 269 }
 270
 271 static int get_param(int param, char **name, struct symbol **sym)
 272 {
 273         struct symbol *arg;
 274         int i;
 275
 276         i = 0;
 277         FOR_EACH_PTR(cur_func_sym->ctype.base_type->arguments, arg) {
 278                 /*
 279                  * this is a temporary hack to work around a bug (I think in sparse?)
 280                  * 2.6.37-rc1:fs/reiserfs/journal.o
 281                  * If there is a function definition without parameter name found
 282                  * after a function implementation then it causes a crash.
 283                  * int foo() {}
 284                  * int bar(char *);
 285                  */
 286                 if (arg->ident->name < (char *)100)
 287                         continue;
 288                 if (i == param && arg->ident->name) {
 289                         *name = arg->ident->name;
 290                         *sym = arg;
 291                         return TRUE;
 292                 }
 293                 i++;
 294         } END_FOR_EACH_PTR(arg);
 295
 296         return FALSE;
 297 }
 298
 299 static struct state_list *final_states;
 300 static int prev_func_id = -1;
 301 static int db_callback(void *unused, int argc, char **argv, char **azColName)
 302 {
 303         int func_id;
 304         long type;
 305         long param;
 306         char *name = NULL;
 307         struct symbol *sym = NULL;
 308         struct def_callback *def_callback;
 309
 310         if (argc != 5)
 311                 return 0;
 312
 313         func_id = atoi(argv[0]);
 314         errno = 0;
 315         type = strtol(argv[1], NULL, 10);
 316         param = strtol(argv[2], NULL, 10);
 317         if (errno)
 318                 return 0;
 319
 320         if (prev_func_id == -1)
 321                 prev_func_id = func_id;
 322         if (func_id != prev_func_id) {
 323                 merge_slist(&final_states, __pop_fake_cur_slist());
 324                 __push_fake_cur_slist();
 325                 __unnullify_path();
 326                 prev_func_id = func_id;
 327         }
 328
 329         if (type == INTERNAL)
 330                 return 0;
 331         if (param >= 0 && !get_param(param, &name, &sym))
 332                 return 0;
 333
 334         FOR_EACH_PTR(callbacks, def_callback) {
 335                 if (def_callback->hook_type == type)
 336                         def_callback->callback(name, sym, argv[3], argv[4]);
 337         } END_FOR_EACH_PTR(def_callback);
 338
 339         return 0;
 340 }
 341
 342 static void get_direct_callers(struct symbol *sym)
 343 {
 344         char sql_filter[1024];
 345
 346         if (sym->ctype.modifiers & MOD_STATIC) {
 347                 snprintf(sql_filter, 1024,
 348                          "file = '%s' and function = '%s' order by function_id;",
 349                          get_filename(), sym->ident->name);
 350         } else {
 351                 snprintf(sql_filter, 1024,
 352                          "function = '%s' and static = 0 order by function_id;",
 353                          sym->ident->name);
 354         }
 355
 356         run_sql(db_callback, "select function_id, type, parameter, key, value from caller_info"
 357                 " where %s", sql_filter);
 358 }
 359
 360 static char *ptr_name;
 361 static int get_ptr_name(void *unused, int argc, char **argv, char **azColName)
 362 {
 363         if (!ptr_name)
 364                 ptr_name = alloc_string(argv[0]);
 365         return 0;
 366 }
 367
 368 static void get_function_pointer_callers(struct symbol *sym)
 369 {
 370         char sql_filter[1024];
 371
 372         if (sym->ctype.modifiers & MOD_STATIC) {
 373                 snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
 374                          get_filename(), sym->ident->name);
 375         } else {
 376                 snprintf(sql_filter, 1024, "function = '%s';",
 377                          sym->ident->name);
 378         }
 379
 380         ptr_name = NULL;
 381         run_sql(get_ptr_name, "select ptr from function_ptr where %s", sql_filter);
 382         if (!ptr_name)
 383                 return;
 384
 385         run_sql(db_callback, "select function_id, type, parameter, key, value from caller_info"
 386                 " where function = '%s' order by function_id", ptr_name);
 387
 388         free_string(ptr_name);
 389 }
 390
 391 static void match_data_from_db(struct symbol *sym)
 392 {
 393         struct sm_state *sm;
 394
 395         if (!sym || !sym->ident || !sym->ident->name)
 396                 return;
 397
 398         __push_fake_cur_slist();
 399         __unnullify_path();
 400         prev_func_id = -1;
 401
 402         get_direct_callers(sym);
 403         get_function_pointer_callers(sym);
 404
 405         merge_slist(&final_states, __pop_fake_cur_slist());
 406
 407         FOR_EACH_PTR(final_states, sm) {
 408                 __set_sm(sm);
 409         } END_FOR_EACH_PTR(sm);
 410
 411         free_slist(&final_states);
 412 }
 413
 414 static void match_function_assign(struct expression *expr)
 415 {
 416         struct expression *right = expr->right;
 417         struct symbol *sym;
 418         char *fn_name;
 419         char *ptr_name;
 420
 421         if (right->type == EXPR_PREOP && right->op == '&')
 422                 right = strip_expr(right->unop);
 423         if (right->type != EXPR_SYMBOL)
 424                 return;
 425         sym = get_type(right);
 426         if (!sym || sym->type != SYM_FN)
 427                 return;
 428
 429         fn_name = expr_to_var(right);
 430         ptr_name = get_fnptr_name(expr->left);
 431         if (!fn_name || !ptr_name)
 432                 goto free;
 433
 434         sql_insert_function_ptr(fn_name, ptr_name);
 435
 436 free:
 437         free_string(fn_name);
 438         free_string(ptr_name);
 439 }
 440
 441 static struct expression *call_implies_call_expr;
 442 static int call_implies_callbacks(void *unused, int argc, char **argv, char **azColName)
 443 {
 444         struct call_implies_callback *cb;
 445         struct expression *arg = NULL;
 446         int type;
 447         int param;
 448
 449         if (argc != 4)
 450                 return 0;
 451
 452         type = atoi(argv[1]);
 453         param = atoi(argv[2]);
 454
 455         FOR_EACH_PTR(call_implies_cb_list, cb) {
 456                 if (cb->type != type)
 457                         continue;
 458                 if (param != -1) {
 459                         arg = get_argument_from_call_expr(call_implies_call_expr->args, param);
 460                         if (!arg)
 461                                 continue;
 462                 }
 463                 cb->callback(arg, argv[3]);
 464         } END_FOR_EACH_PTR(cb);
 465
 466         return 0;
 467 }
 468
 469 static void match_call_implies(struct expression *expr)
 470 {
 471         struct symbol *sym;
 472         static char sql_filter[1024];
 473
 474         if (expr->fn->type != EXPR_SYMBOL)
 475                 return;
 476         sym = expr->fn->symbol;
 477         if (!sym)
 478                 return;
 479
 480         if (sym->ctype.modifiers & MOD_STATIC) {
 481                 snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
 482                          get_filename(), sym->ident->name);
 483         } else {
 484                 snprintf(sql_filter, 1024, "function = '%s' and static = 0;",
 485                                 sym->ident->name);
 486         }
 487
 488         call_implies_call_expr = expr;
 489         run_sql(call_implies_callbacks,
 490                 "select function, type, parameter, value from call_implies where %s",
 491                 sql_filter);
 492         return;
 493 }
 494
 495 static void print_initializer_list(struct expression_list *expr_list,
 496                 struct symbol *struct_type)
 497 {
 498         struct expression *expr;
 499         struct symbol *base_type;
 500         char struct_name[256];
 501
 502         FOR_EACH_PTR(expr_list, expr) {
 503                 if (expr->type == EXPR_INDEX && expr->idx_expression && expr->idx_expression->type == EXPR_INITIALIZER) {
 504                         print_initializer_list(expr->idx_expression->expr_list, struct_type);
 505                         continue;
 506                 }
 507                 if (expr->type != EXPR_IDENTIFIER)
 508                         continue;
 509                 if (!expr->expr_ident)
 510                         continue;
 511                 if (!expr->ident_expression || !expr->ident_expression->symbol_name)
 512                         continue;
 513                 base_type = get_type(expr->ident_expression);
 514                 if (!base_type || base_type->type != SYM_FN)
 515                         continue;
 516                 snprintf(struct_name, sizeof(struct_name), "(struct %s)->%s",
 517                          struct_type->ident->name, expr->expr_ident->name);
 518                 sql_insert_function_ptr(expr->ident_expression->symbol_name->name,
 519                                         struct_name);
 520         } END_FOR_EACH_PTR(expr);
 521 }
 522
 523 static void global_variable(struct symbol *sym)
 524 {
 525         struct symbol *struct_type;
 526
 527         if (!sym->ident)
 528                 return;
 529         if (!sym->initializer || sym->initializer->type != EXPR_INITIALIZER)
 530                 return;
 531         struct_type = get_base_type(sym);
 532         if (!struct_type)
 533                 return;
 534         if (struct_type->type == SYM_ARRAY) {
 535                 struct_type = get_base_type(struct_type);
 536                 if (!struct_type)
 537                         return;
 538         }
 539         if (struct_type->type != SYM_STRUCT || !struct_type->ident)
 540                 return;
 541         print_initializer_list(sym->initializer->expr_list, struct_type);
 542 }
 543
 544 static void match_return_info(int return_id, char *return_ranges, struct expression *expr, struct state_list *slist)
 545 {
 546         sql_insert_return_states(return_id, return_ranges, INTERNAL, -1, "", "");
 547 }
 548
 549 static int return_id;
 550 static void match_function_def(struct symbol *sym)
 551 {
 552         return_id = 0;
 553 }
 554
 555 static void call_return_state_hooks_compare(struct expression *expr)
 556 {
 557         struct returned_state_callback *cb;
 558         struct state_list *slist;
 559         char *return_ranges;
 560         int final_pass_orig = final_pass;
 561
 562         __push_fake_cur_slist();
 563
 564         final_pass = 0;
 565         __split_whole_condition(expr);
 566         final_pass = final_pass_orig;
 567
 568         return_ranges = alloc_sname("1");
 569
 570         return_id++;
 571         slist = __get_cur_slist();
 572         FOR_EACH_PTR(returned_state_callbacks, cb) {
 573                 cb->callback(return_id, return_ranges, expr, slist);
 574         } END_FOR_EACH_PTR(cb);
 575
 576         __push_true_states();
 577         __use_false_states();
 578
 579         return_ranges = alloc_sname("0");;
 580         return_id++;
 581         slist = __get_cur_slist();
 582         FOR_EACH_PTR(returned_state_callbacks, cb) {
 583                 cb->callback(return_id, return_ranges, expr, slist);
 584         } END_FOR_EACH_PTR(cb);
 585
 586         __merge_true_states();
 587         __pop_fake_cur_slist();
 588 }
 589
 590 static int call_return_state_hooks_split_possible(struct expression *expr)
 591 {
 592         struct returned_state_callback *cb;
 593         struct state_list *slist;
 594         struct range_list *rl;
 595         char *return_ranges;
 596         struct sm_state *sm;
 597         struct sm_state *tmp;
 598         int ret = 0;
 599         int nr_possible, nr_states;
 600
 601         sm = get_sm_state_expr(SMATCH_EXTRA, expr);
 602         if (!sm || !sm->merged)
 603                 return 0;
 604
 605         /* bail if it gets too complicated */
 606         nr_possible = ptr_list_size((struct ptr_list *)sm->possible);
 607         nr_states = ptr_list_size((struct ptr_list *)__get_cur_slist());
 608         if (nr_possible >= 100)
 609                 return 0;
 610         if (nr_states * nr_possible >= 1000)
 611                 return 0;
 612
 613         FOR_EACH_PTR(sm->possible, tmp) {
 614                 if (tmp->merged)
 615                         continue;
 616
 617                 ret = 1;
 618                 __push_fake_cur_slist();
 619
 620                 overwrite_states_using_pool(tmp);
 621
 622                 rl = cast_rl(cur_func_return_type(), estate_rl(tmp->state));
 623                 return_ranges = show_rl(rl);
 624
 625                 return_id++;
 626                 slist = __get_cur_slist();
 627                 FOR_EACH_PTR(returned_state_callbacks, cb) {
 628                         cb->callback(return_id, return_ranges, expr, slist);
 629                 } END_FOR_EACH_PTR(cb);
 630
 631                 __pop_fake_cur_slist();
 632         } END_FOR_EACH_PTR(tmp);
 633
 634         return ret;
 635 }
 636
 637 static void call_return_state_hooks(struct expression *expr)
 638 {
 639         struct returned_state_callback *cb;
 640         struct state_list *slist;
 641         struct range_list *rl;
 642         char *return_ranges;
 643         int nr_states;
 644
 645         expr = strip_expr(expr);
 646
 647         if (!expr) {
 648                 return_ranges = alloc_sname("");
 649         } else if (is_condition(expr)) {
 650                 call_return_state_hooks_compare(expr);
 651                 return;
 652         } else if (call_return_state_hooks_split_possible(expr)) {
 653                 return;
 654         } else if (get_implied_rl(expr, &rl)) {
 655                 rl = cast_rl(cur_func_return_type(), rl);
 656                 return_ranges = show_rl(rl);
 657         } else {
 658                 rl = alloc_whole_rl(cur_func_return_type());
 659                 return_ranges = show_rl(rl);
 660         }
 661
 662         return_id++;
 663         slist = __get_cur_slist();
 664         nr_states = ptr_list_size((struct ptr_list *)__get_cur_slist());
 665         FOR_EACH_PTR(returned_state_callbacks, cb) {
 666                 if (nr_states < 10000)
 667                         cb->callback(return_id, return_ranges, expr, slist);
 668                 else
 669                         cb->callback(return_id, return_ranges, expr, NULL);
 670         } END_FOR_EACH_PTR(cb);
 671 }
 672
 673 static void print_returned_struct_members(int return_id, char *return_ranges, struct expression *expr, struct state_list *slist)
 674 {
 675         struct returned_member_callback *cb;
 676         struct state_list *my_slist;
 677         struct sm_state *sm;
 678         struct symbol *type;
 679         char *name;
 680         char member_name[256];
 681         int len;
 682
 683         type = get_type(expr);
 684         if (!type || type->type != SYM_PTR)
 685                 return;
 686         type = get_real_base_type(type);
 687         if (!type || type->type != SYM_STRUCT)
 688                 return;
 689         name = expr_to_var(expr);
 690         if (!name)
 691                 return;
 692
 693         member_name[sizeof(member_name) - 1] = '\0';
 694         strcpy(member_name, "$$");
 695
 696         len = strlen(name);
 697         FOR_EACH_PTR(returned_member_callbacks, cb) {
 698                 my_slist = get_all_states_slist(cb->owner, slist);
 699                 FOR_EACH_PTR(my_slist, sm) {
 700                         if (strncmp(sm->name, name, len) != 0)
 701                                 continue;
 702                         if (strncmp(sm->name + len, "->", 2) != 0)
 703                                 continue;
 704                         strncpy(member_name + 2, sm->name + len, sizeof(member_name) - 2);
 705                         cb->callback(return_id, return_ranges, member_name, sm->state);
 706                 } END_FOR_EACH_PTR(sm);
 707                 free_slist(&my_slist);
 708         } END_FOR_EACH_PTR(cb);
 709
 710         free_string(name);
 711 }
 712
 713 static void match_end_func_info(struct symbol *sym)
 714 {
 715         if (__path_is_null())
 716                 return;
 717         call_return_state_hooks(NULL);
 718 }
 719
 720 void open_smatch_db(void)
 721 {
 722 #ifdef SQLITE_OPEN_READONLY
 723         int rc;
 724
 725         if (option_no_db)
 726                 return;
 727
 728         rc = sqlite3_open_v2("smatch_db.sqlite", &db, SQLITE_OPEN_READONLY, NULL);
 729         if (rc != SQLITE_OK) {
 730                 option_no_db = 1;
 731                 return;
 732         }
 733         return;
 734 #else
 735         option_no_db = 1;
 736         return;
 737 #endif
 738 }
 739
 740 void register_definition_db_callbacks(int id)
 741 {
 742         add_hook(&match_function_def, FUNC_DEF_HOOK);
 743
 744         if (option_info) {
 745                 add_hook(&match_call_info, FUNCTION_CALL_HOOK);
 746                 add_hook(&match_call_hack, FUNCTION_CALL_HOOK);
 747                 add_hook(&match_function_assign, ASSIGNMENT_HOOK);
 748                 add_hook(&match_function_assign, GLOBAL_ASSIGNMENT_HOOK);
 749                 add_hook(&global_variable, BASE_HOOK);
 750                 add_hook(&global_variable, DECLARATION_HOOK);
 751                 add_returned_state_callback(match_return_info);
 752                 add_returned_state_callback(print_returned_struct_members);
 753                 add_hook(&call_return_state_hooks, RETURN_HOOK);
 754                 add_hook(&match_end_func_info, END_FUNC_HOOK);
 755         }
 756
 757         if (option_no_db)
 758                 return;
 759
 760         add_hook(&match_data_from_db, FUNC_DEF_HOOK);
 761         add_hook(&match_call_implies, FUNCTION_CALL_HOOK);
 762 }
 763
 764 char *get_variable_from_key(struct expression *arg, char *key, struct symbol **sym)
 765 {
 766         char buf[256];
 767         char *tmp;
 768
 769         if (strcmp(key, "$$") == 0)
 770                 return expr_to_var_sym(arg, sym);
 771
 772         if (strcmp(key, "*$$") == 0) {
 773                 if (arg->type == EXPR_PREOP && arg->op == '&') {
 774                         arg = strip_expr(arg->unop);
 775                         return expr_to_var_sym(arg, sym);
 776                 } else {
 777                         tmp = expr_to_var_sym(arg, sym);
 778                         if (!tmp)
 779                                 return NULL;
 780                         snprintf(buf, sizeof(buf), "*%s", tmp);
 781                         free_string(tmp);
 782                         return alloc_string(buf);
 783                 }
 784         }
 785
 786         if (arg->type == EXPR_PREOP && arg->op == '&') {
 787                 arg = strip_expr(arg->unop);
 788                 tmp = expr_to_var_sym(arg, sym);
 789                 if (!tmp)
 790                         return NULL;
 791                 snprintf(buf, sizeof(buf), "%s.%s", tmp, key + 4);
 792                 return alloc_string(buf);
 793         }
 794
 795         tmp = expr_to_var_sym(arg, sym);
 796         if (!tmp)
 797                 return NULL;
 798         snprintf(buf, sizeof(buf), "%s%s", tmp, key + 2);
 799         free_string(tmp);
 800         return alloc_string(buf);
 801 }
 802
 803