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 sql_insert_return_values(const char *return_values)
  97 {
  98         sql_insert(return_values, "'%s', '%s', %d, '%s'", get_filename(),
  99                    get_function(), fn_static(), return_values);
 100 }
 101
 102 void add_definition_db_callback(void (*callback)(const char *name, struct symbol *sym, char *key, char *value), int type)
 103 {
 104         struct def_callback *def_callback = __alloc_def_callback(0);
 105
 106         def_callback->hook_type = type;
 107         def_callback->callback = callback;
 108         add_ptr_list(&callbacks, def_callback);
 109 }
 110
 111 /*
 112  * These call backs are used when the --info option is turned on to print struct
 113  * member information.  For example foo->bar could have a state in
 114  * smatch_extra.c and also check_user.c.
 115  */
 116 void add_member_info_callback(int owner, void (*callback)(char *fn, char *global_static, int param, char *printed_name, struct smatch_state *state))
 117 {
 118         struct member_info_callback *member_callback = __alloc_member_info_callback(0);
 119
 120         member_callback->owner = owner;
 121         member_callback->callback = callback;
 122         add_ptr_list(&member_callbacks, member_callback);
 123 }
 124
 125 void add_returned_state_callback(void (*fn)(int return_id, char *return_ranges, struct expression *returned_expr, struct state_list *slist))
 126 {
 127         struct returned_state_callback *callback = __alloc_returned_state_callback(0);
 128
 129         callback->callback = fn;
 130         add_ptr_list(&returned_state_callbacks, callback);
 131 }
 132
 133 void add_returned_member_callback(int owner, void (*callback)(int return_id, char *return_ranges, char *printed_name, struct smatch_state *state))
 134 {
 135         struct returned_member_callback *member_callback = __alloc_returned_member_callback(0);
 136
 137         member_callback->owner = owner;
 138         member_callback->callback = callback;
 139         add_ptr_list(&returned_member_callbacks, member_callback);
 140 }
 141
 142 void add_db_fn_call_callback(int type, void (*callback)(struct expression *arg, char *value))
 143 {
 144         struct call_implies_callback *cb = __alloc_call_implies_callback(0);
 145
 146         cb->type = type;
 147         cb->callback = callback;
 148         add_ptr_list(&call_implies_cb_list, cb);
 149 }
 150
 151 static struct symbol *return_type;
 152 static struct range_list *return_range_list;
 153 static int db_return_callback(void *unused, int argc, char **argv, char **azColName)
 154 {
 155         if (argc != 1)
 156                 return 0;
 157         if (option_debug)
 158                 sm_msg("return type %d", type_positive_bits(return_type));
 159         str_to_rl(return_type, argv[0], &return_range_list);
 160         return 0;
 161 }
 162
 163 struct range_list *db_return_vals(struct expression *expr)
 164 {
 165         struct symbol *sym;
 166         static char sql_filter[1024];
 167
 168         if (expr->type != EXPR_CALL)
 169                 return NULL;
 170         if (expr->fn->type != EXPR_SYMBOL)
 171                 return NULL;
 172         return_type = get_type(expr);
 173         if (!return_type)
 174                 return NULL;
 175         sym = expr->fn->symbol;
 176         if (!sym)
 177                 return NULL;
 178
 179         if (sym->ctype.modifiers & MOD_STATIC) {
 180                 snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
 181                          get_filename(), sym->ident->name);
 182         } else {
 183                 snprintf(sql_filter, 1024, "function = '%s' and static = 0;",
 184                                 sym->ident->name);
 185         }
 186
 187         return_range_list = NULL;
 188         run_sql(db_return_callback, "select return from return_values where %s",
 189                  sql_filter);
 190         return return_range_list;
 191 }
 192
 193 static void match_call_hack(struct expression *expr)
 194 {
 195         char *name;
 196
 197         /*
 198          * we just want to record something in the database so that if we have
 199          * two calls like:  frob(4); frob(some_unkown); then on the receiving
 200          * side we know that sometimes frob is called with unknown parameters.
 201          */
 202
 203         name = get_fnptr_name(expr->fn);
 204         if (!name)
 205                 return;
 206         sm_msg("info: call_marker '%s' %s", name, is_static(expr->fn) ? "static" : "global");
 207         free_string(name);
 208 }
 209
 210 static void print_struct_members(char *fn, char *global_static, struct expression *expr, int param, struct state_list *slist,
 211         void (*callback)(char *fn, char *global_static, int param, char *printed_name, struct smatch_state *state))
 212 {
 213         struct sm_state *sm;
 214         char *name;
 215         struct symbol *sym;
 216         int len;
 217         char printed_name[256];
 218         int is_address = 0;
 219
 220         expr = strip_expr(expr);
 221         if (expr->type == EXPR_PREOP && expr->op == '&') {
 222                 expr = strip_expr(expr->unop);
 223                 is_address = 1;
 224         }
 225
 226         name = expr_to_var_sym(expr, &sym);
 227         if (!name || !sym)
 228                 goto free;
 229
 230         len = strlen(name);
 231         FOR_EACH_PTR(slist, sm) {
 232                 if (sm->sym != sym)
 233                         continue;
 234                 if (strncmp(name, sm->name, len) || sm->name[len] == '\0')
 235                         continue;
 236                 if (is_address)
 237                         snprintf(printed_name, sizeof(printed_name), "$$->%s", sm->name + len + 1);
 238                 else
 239                         snprintf(printed_name, sizeof(printed_name), "$$%s", sm->name + len);
 240                 callback(fn, global_static, param, printed_name, sm->state);
 241         } END_FOR_EACH_PTR(sm);
 242 free:
 243         free_string(name);
 244 }
 245
 246 static void match_call_info(struct expression *expr)
 247 {
 248         struct member_info_callback *cb;
 249         struct expression *arg;
 250         struct state_list *slist;
 251         char *name;
 252         int i;
 253         char *gs;
 254
 255         name = get_fnptr_name(expr->fn);
 256         if (!name)
 257                 return;
 258
 259         if (is_static(expr->fn))
 260                 gs = (char *)"static";
 261         else
 262                 gs = (char *)"global";
 263
 264         FOR_EACH_PTR(member_callbacks, cb) {
 265                 slist = get_all_states(cb->owner);
 266                 i = 0;
 267                 FOR_EACH_PTR(expr->args, arg) {
 268                         print_struct_members(name, gs, arg, i, slist, cb->callback);
 269                         i++;
 270                 } END_FOR_EACH_PTR(arg);
 271                 free_slist(&slist);
 272         } END_FOR_EACH_PTR(cb);
 273
 274         free_string(name);
 275 }
 276
 277 static int get_param(int param, char **name, struct symbol **sym)
 278 {
 279         struct symbol *arg;
 280         int i;
 281
 282         i = 0;
 283         FOR_EACH_PTR(cur_func_sym->ctype.base_type->arguments, arg) {
 284                 /*
 285                  * this is a temporary hack to work around a bug (I think in sparse?)
 286                  * 2.6.37-rc1:fs/reiserfs/journal.o
 287                  * If there is a function definition without parameter name found
 288                  * after a function implementation then it causes a crash.
 289                  * int foo() {}
 290                  * int bar(char *);
 291                  */
 292                 if (arg->ident->name < (char *)100)
 293                         continue;
 294                 if (i == param && arg->ident->name) {
 295                         *name = arg->ident->name;
 296                         *sym = arg;
 297                         return TRUE;
 298                 }
 299                 i++;
 300         } END_FOR_EACH_PTR(arg);
 301
 302         return FALSE;
 303 }
 304
 305 static struct state_list *final_states;
 306 static int prev_func_id = -1;
 307 static int db_callback(void *unused, int argc, char **argv, char **azColName)
 308 {
 309         int func_id;
 310         long type;
 311         long param;
 312         char *name = NULL;
 313         struct symbol *sym = NULL;
 314         struct def_callback *def_callback;
 315
 316         if (argc != 5)
 317                 return 0;
 318
 319         func_id = atoi(argv[0]);
 320         errno = 0;
 321         type = strtol(argv[1], NULL, 10);
 322         param = strtol(argv[2], NULL, 10);
 323         if (errno)
 324                 return 0;
 325
 326         if (prev_func_id == -1)
 327                 prev_func_id = func_id;
 328         if (func_id != prev_func_id) {
 329                 merge_slist(&final_states, __pop_fake_cur_slist());
 330                 __push_fake_cur_slist();
 331                 __unnullify_path();
 332                 prev_func_id = func_id;
 333         }
 334
 335         if (type == INTERNAL)
 336                 return 0;
 337         if (param >= 0 && !get_param(param, &name, &sym))
 338                 return 0;
 339
 340         FOR_EACH_PTR(callbacks, def_callback) {
 341                 if (def_callback->hook_type == type)
 342                         def_callback->callback(name, sym, argv[3], argv[4]);
 343         } END_FOR_EACH_PTR(def_callback);
 344
 345         return 0;
 346 }
 347
 348 static void get_direct_callers(struct symbol *sym)
 349 {
 350         char sql_filter[1024];
 351
 352         if (sym->ctype.modifiers & MOD_STATIC) {
 353                 snprintf(sql_filter, 1024,
 354                          "file = '%s' and function = '%s' order by function_id;",
 355                          get_filename(), sym->ident->name);
 356         } else {
 357                 snprintf(sql_filter, 1024,
 358                          "function = '%s' and static = 0 order by function_id;",
 359                          sym->ident->name);
 360         }
 361
 362         run_sql(db_callback, "select function_id, type, parameter, key, value from caller_info"
 363                 " where %s", sql_filter);
 364 }
 365
 366 static char *ptr_name;
 367 static int get_ptr_name(void *unused, int argc, char **argv, char **azColName)
 368 {
 369         if (!ptr_name)
 370                 ptr_name = alloc_string(argv[0]);
 371         return 0;
 372 }
 373
 374 static void get_function_pointer_callers(struct symbol *sym)
 375 {
 376         char sql_filter[1024];
 377
 378         if (sym->ctype.modifiers & MOD_STATIC) {
 379                 snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
 380                          get_filename(), sym->ident->name);
 381         } else {
 382                 snprintf(sql_filter, 1024, "function = '%s';",
 383                          sym->ident->name);
 384         }
 385
 386         ptr_name = NULL;
 387         run_sql(get_ptr_name, "select ptr from function_ptr where %s", sql_filter);
 388         if (!ptr_name)
 389                 return;
 390
 391         run_sql(db_callback, "select function_id, type, parameter, key, value from caller_info"
 392                 " where function = '%s' order by function_id", ptr_name);
 393
 394         free_string(ptr_name);
 395 }
 396
 397 static void match_data_from_db(struct symbol *sym)
 398 {
 399         struct sm_state *sm;
 400
 401         if (!sym || !sym->ident || !sym->ident->name)
 402                 return;
 403
 404         __push_fake_cur_slist();
 405         __unnullify_path();
 406         prev_func_id = -1;
 407
 408         get_direct_callers(sym);
 409         get_function_pointer_callers(sym);
 410
 411         merge_slist(&final_states, __pop_fake_cur_slist());
 412
 413         FOR_EACH_PTR(final_states, sm) {
 414                 __set_sm(sm);
 415         } END_FOR_EACH_PTR(sm);
 416
 417         free_slist(&final_states);
 418 }
 419
 420 static void match_function_assign(struct expression *expr)
 421 {
 422         struct expression *right = expr->right;
 423         struct symbol *sym;
 424         char *fn_name;
 425         char *ptr_name;
 426
 427         if (right->type == EXPR_PREOP && right->op == '&')
 428                 right = strip_expr(right->unop);
 429         if (right->type != EXPR_SYMBOL)
 430                 return;
 431         sym = get_type(right);
 432         if (!sym || sym->type != SYM_FN)
 433                 return;
 434
 435         fn_name = expr_to_var(right);
 436         ptr_name = get_fnptr_name(expr->left);
 437         if (!fn_name || !ptr_name)
 438                 goto free;
 439
 440         sql_insert_function_ptr(fn_name, ptr_name);
 441
 442 free:
 443         free_string(fn_name);
 444         free_string(ptr_name);
 445 }
 446
 447 static struct expression *call_implies_call_expr;
 448 static int call_implies_callbacks(void *unused, int argc, char **argv, char **azColName)
 449 {
 450         struct call_implies_callback *cb;
 451         struct expression *arg = NULL;
 452         int type;
 453         int param;
 454
 455         if (argc != 4)
 456                 return 0;
 457
 458         type = atoi(argv[1]);
 459         param = atoi(argv[2]);
 460
 461         FOR_EACH_PTR(call_implies_cb_list, cb) {
 462                 if (cb->type != type)
 463                         continue;
 464                 if (param != -1) {
 465                         arg = get_argument_from_call_expr(call_implies_call_expr->args, param);
 466                         if (!arg)
 467                                 continue;
 468                 }
 469                 cb->callback(arg, argv[3]);
 470         } END_FOR_EACH_PTR(cb);
 471
 472         return 0;
 473 }
 474
 475 static void match_call_implies(struct expression *expr)
 476 {
 477         struct symbol *sym;
 478         static char sql_filter[1024];
 479
 480         if (expr->fn->type != EXPR_SYMBOL)
 481                 return;
 482         sym = expr->fn->symbol;
 483         if (!sym)
 484                 return;
 485
 486         if (sym->ctype.modifiers & MOD_STATIC) {
 487                 snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
 488                          get_filename(), sym->ident->name);
 489         } else {
 490                 snprintf(sql_filter, 1024, "function = '%s' and static = 0;",
 491                                 sym->ident->name);
 492         }
 493
 494         call_implies_call_expr = expr;
 495         run_sql(call_implies_callbacks,
 496                 "select function, type, parameter, value from call_implies where %s",
 497                 sql_filter);
 498         return;
 499 }
 500
 501 static void print_initializer_list(struct expression_list *expr_list,
 502                 struct symbol *struct_type)
 503 {
 504         struct expression *expr;
 505         struct symbol *base_type;
 506         char struct_name[256];
 507
 508         FOR_EACH_PTR(expr_list, expr) {
 509                 if (expr->type == EXPR_INDEX && expr->idx_expression && expr->idx_expression->type == EXPR_INITIALIZER) {
 510                         print_initializer_list(expr->idx_expression->expr_list, struct_type);
 511                         continue;
 512                 }
 513                 if (expr->type != EXPR_IDENTIFIER)
 514                         continue;
 515                 if (!expr->expr_ident)
 516                         continue;
 517                 if (!expr->ident_expression || !expr->ident_expression->symbol_name)
 518                         continue;
 519                 base_type = get_type(expr->ident_expression);
 520                 if (!base_type || base_type->type != SYM_FN)
 521                         continue;
 522                 snprintf(struct_name, sizeof(struct_name), "(struct %s)->%s",
 523                          struct_type->ident->name, expr->expr_ident->name);
 524                 sql_insert_function_ptr(expr->ident_expression->symbol_name->name,
 525                                         struct_name);
 526         } END_FOR_EACH_PTR(expr);
 527 }
 528
 529 static void global_variable(struct symbol *sym)
 530 {
 531         struct symbol *struct_type;
 532
 533         if (!sym->ident)
 534                 return;
 535         if (!sym->initializer || sym->initializer->type != EXPR_INITIALIZER)
 536                 return;
 537         struct_type = get_base_type(sym);
 538         if (!struct_type)
 539                 return;
 540         if (struct_type->type == SYM_ARRAY) {
 541                 struct_type = get_base_type(struct_type);
 542                 if (!struct_type)
 543                         return;
 544         }
 545         if (struct_type->type != SYM_STRUCT || !struct_type->ident)
 546                 return;
 547         print_initializer_list(sym->initializer->expr_list, struct_type);
 548 }
 549
 550 static void match_return_info(int return_id, char *return_ranges, struct expression *expr, struct state_list *slist)
 551 {
 552         sql_insert_return_states(return_id, return_ranges, INTERNAL, -1, "", "");
 553 }
 554
 555 static int return_id;
 556 static void match_function_def(struct symbol *sym)
 557 {
 558         return_id = 0;
 559 }
 560
 561 static void call_return_state_hooks_compare(struct expression *expr)
 562 {
 563         struct returned_state_callback *cb;
 564         struct state_list *slist;
 565         char *return_ranges;
 566         int final_pass_orig = final_pass;
 567
 568         __push_fake_cur_slist();
 569
 570         final_pass = 0;
 571         __split_whole_condition(expr);
 572         final_pass = final_pass_orig;
 573
 574         return_ranges = alloc_sname("1");
 575
 576         return_id++;
 577         slist = __get_cur_slist();
 578         FOR_EACH_PTR(returned_state_callbacks, cb) {
 579                 cb->callback(return_id, return_ranges, expr, slist);
 580         } END_FOR_EACH_PTR(cb);
 581
 582         __push_true_states();
 583         __use_false_states();
 584
 585         return_ranges = alloc_sname("0");;
 586         return_id++;
 587         slist = __get_cur_slist();
 588         FOR_EACH_PTR(returned_state_callbacks, cb) {
 589                 cb->callback(return_id, return_ranges, expr, slist);
 590         } END_FOR_EACH_PTR(cb);
 591
 592         __merge_true_states();
 593         __pop_fake_cur_slist();
 594 }
 595
 596 static int call_return_state_hooks_split_possible(struct expression *expr)
 597 {
 598         struct returned_state_callback *cb;
 599         struct state_list *slist;
 600         struct range_list *rl;
 601         char *return_ranges;
 602         struct sm_state *sm;
 603         struct sm_state *tmp;
 604         int ret = 0;
 605         int nr_possible, nr_states;
 606
 607         sm = get_sm_state_expr(SMATCH_EXTRA, expr);
 608         if (!sm || !sm->merged)
 609                 return 0;
 610
 611         /* bail if it gets too complicated */
 612         nr_possible = ptr_list_size((struct ptr_list *)sm->possible);
 613         nr_states = ptr_list_size((struct ptr_list *)__get_cur_slist());
 614         if (nr_possible >= 100)
 615                 return 0;
 616         if (nr_states * nr_possible >= 1000)
 617                 return 0;
 618
 619         FOR_EACH_PTR(sm->possible, tmp) {
 620                 if (tmp->merged)
 621                         continue;
 622
 623                 ret = 1;
 624                 __push_fake_cur_slist();
 625
 626                 overwrite_states_using_pool(tmp);
 627
 628                 rl = cast_rl(cur_func_return_type(), estate_rl(tmp->state));
 629                 return_ranges = show_rl(rl);
 630
 631                 return_id++;
 632                 slist = __get_cur_slist();
 633                 FOR_EACH_PTR(returned_state_callbacks, cb) {
 634                         cb->callback(return_id, return_ranges, expr, slist);
 635                 } END_FOR_EACH_PTR(cb);
 636
 637                 __pop_fake_cur_slist();
 638         } END_FOR_EACH_PTR(tmp);
 639
 640         return ret;
 641 }
 642
 643 static void call_return_state_hooks(struct expression *expr)
 644 {
 645         struct returned_state_callback *cb;
 646         struct state_list *slist;
 647         struct range_list *rl;
 648         char *return_ranges;
 649         int nr_states;
 650
 651         expr = strip_expr(expr);
 652
 653         if (!expr) {
 654                 return_ranges = alloc_sname("");
 655         } else if (is_condition(expr)) {
 656                 call_return_state_hooks_compare(expr);
 657                 return;
 658         } else if (call_return_state_hooks_split_possible(expr)) {
 659                 return;
 660         } else if (get_implied_rl(expr, &rl)) {
 661                 rl = cast_rl(cur_func_return_type(), rl);
 662                 return_ranges = show_rl(rl);
 663         } else {
 664                 rl = alloc_whole_rl(cur_func_return_type());
 665                 return_ranges = show_rl(rl);
 666         }
 667
 668         return_id++;
 669         slist = __get_cur_slist();
 670         nr_states = ptr_list_size((struct ptr_list *)__get_cur_slist());
 671         FOR_EACH_PTR(returned_state_callbacks, cb) {
 672                 if (nr_states < 10000)
 673                         cb->callback(return_id, return_ranges, expr, slist);
 674                 else
 675                         cb->callback(return_id, return_ranges, expr, NULL);
 676         } END_FOR_EACH_PTR(cb);
 677 }
 678
 679 static void print_returned_struct_members(int return_id, char *return_ranges, struct expression *expr, struct state_list *slist)
 680 {
 681         struct returned_member_callback *cb;
 682         struct state_list *my_slist;
 683         struct sm_state *sm;
 684         struct symbol *type;
 685         char *name;
 686         char member_name[256];
 687         int len;
 688
 689         type = get_type(expr);
 690         if (!type || type->type != SYM_PTR)
 691                 return;
 692         type = get_real_base_type(type);
 693         if (!type || type->type != SYM_STRUCT)
 694                 return;
 695         name = expr_to_var(expr);
 696         if (!name)
 697                 return;
 698
 699         member_name[sizeof(member_name) - 1] = '\0';
 700         strcpy(member_name, "$$");
 701
 702         len = strlen(name);
 703         FOR_EACH_PTR(returned_member_callbacks, cb) {
 704                 my_slist = get_all_states_slist(cb->owner, slist);
 705                 FOR_EACH_PTR(my_slist, sm) {
 706                         if (strncmp(sm->name, name, len) != 0)
 707                                 continue;
 708                         if (strncmp(sm->name + len, "->", 2) != 0)
 709                                 continue;
 710                         strncpy(member_name + 2, sm->name + len, sizeof(member_name) - 2);
 711                         cb->callback(return_id, return_ranges, member_name, sm->state);
 712                 } END_FOR_EACH_PTR(sm);
 713                 free_slist(&my_slist);
 714         } END_FOR_EACH_PTR(cb);
 715
 716         free_string(name);
 717 }
 718
 719 static void match_end_func_info(struct symbol *sym)
 720 {
 721         if (__path_is_null())
 722                 return;
 723         call_return_state_hooks(NULL);
 724 }
 725
 726 void open_smatch_db(void)
 727 {
 728 #ifdef SQLITE_OPEN_READONLY
 729         int rc;
 730
 731         if (option_no_db)
 732                 return;
 733
 734         rc = sqlite3_open_v2("smatch_db.sqlite", &db, SQLITE_OPEN_READONLY, NULL);
 735         if (rc != SQLITE_OK) {
 736                 option_no_db = 1;
 737                 return;
 738         }
 739         return;
 740 #else
 741         option_no_db = 1;
 742         return;
 743 #endif
 744 }
 745
 746 void register_definition_db_callbacks(int id)
 747 {
 748         add_hook(&match_function_def, FUNC_DEF_HOOK);
 749
 750         if (option_info) {
 751                 add_hook(&match_call_info, FUNCTION_CALL_HOOK);
 752                 add_hook(&match_call_hack, FUNCTION_CALL_HOOK);
 753                 add_hook(&match_function_assign, ASSIGNMENT_HOOK);
 754                 add_hook(&match_function_assign, GLOBAL_ASSIGNMENT_HOOK);
 755                 add_hook(&global_variable, BASE_HOOK);
 756                 add_hook(&global_variable, DECLARATION_HOOK);
 757                 add_returned_state_callback(match_return_info);
 758                 add_returned_state_callback(print_returned_struct_members);
 759                 add_hook(&call_return_state_hooks, RETURN_HOOK);
 760                 add_hook(&match_end_func_info, END_FUNC_HOOK);
 761         }
 762
 763         if (option_no_db)
 764                 return;
 765
 766         add_hook(&match_data_from_db, FUNC_DEF_HOOK);
 767         add_hook(&match_call_implies, FUNCTION_CALL_HOOK);
 768 }
 769
 770 char *get_variable_from_key(struct expression *arg, char *key, struct symbol **sym)
 771 {
 772         char buf[256];
 773         char *tmp;
 774
 775         if (strcmp(key, "$$") == 0)
 776                 return expr_to_var_sym(arg, sym);
 777
 778         if (strcmp(key, "*$$") == 0) {
 779                 if (arg->type == EXPR_PREOP && arg->op == '&') {
 780                         arg = strip_expr(arg->unop);
 781                         return expr_to_var_sym(arg, sym);
 782                 } else {
 783                         tmp = expr_to_var_sym(arg, sym);
 784                         if (!tmp)
 785                                 return NULL;
 786                         snprintf(buf, sizeof(buf), "*%s", tmp);
 787                         free_string(tmp);
 788                         return alloc_string(buf);
 789                 }
 790         }
 791
 792         if (arg->type == EXPR_PREOP && arg->op == '&') {
 793                 arg = strip_expr(arg->unop);
 794                 tmp = expr_to_var_sym(arg, sym);
 795                 if (!tmp)
 796                         return NULL;
 797                 snprintf(buf, sizeof(buf), "%s.%s", tmp, key + 4);
 798                 return alloc_string(buf);
 799         }
 800
 801         tmp = expr_to_var_sym(arg, sym);
 802         if (!tmp)
 803                 return NULL;
 804         snprintf(buf, sizeof(buf), "%s%s", tmp, key + 2);
 805         free_string(tmp);
 806         return alloc_string(buf);
 807 }
 808
 809