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, int static_flag, 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_caller_info(const char *fn, int static_flag, int type,
  91                 int param, const char *key, const char *value)
  92 {
  93         if (!option_info)
  94                 return;
  95
  96         sm_msg("SQL_caller_info: insert into caller_info values ("
  97                "'%s', '%s', '%s', %%FUNC_ID%%, %d, %d, %d, '%s', '%s');",
  98                get_filename(), get_function(), fn, static_flag, type, param,
  99                key, value);
 100 }
 101
 102 void sql_insert_function_ptr(const char *fn, const char *struct_name)
 103 {
 104         sql_insert(function_ptr, "'%s', '%s', '%s'", get_filename(), fn,
 105                    struct_name);
 106 }
 107
 108 void sql_insert_return_values(const char *return_values)
 109 {
 110         sql_insert(return_values, "'%s', '%s', %d, '%s'", get_filename(),
 111                    get_function(), fn_static(), return_values);
 112 }
 113
 114 void sql_insert_call_implies(int type, int param, int value)
 115 {
 116         sql_insert(call_implies, "'%s', '%s', %d, %d, %d, %d", get_filename(),
 117                    get_function(), fn_static(), type, param, value);
 118 }
 119
 120 void sql_insert_type_size(const char *member, int size)
 121 {
 122         sql_insert(type_size, "'%s', '%s', %d", get_filename(), member, size);
 123 }
 124
 125 void add_definition_db_callback(void (*callback)(const char *name, struct symbol *sym, char *key, char *value), int type)
 126 {
 127         struct def_callback *def_callback = __alloc_def_callback(0);
 128
 129         def_callback->hook_type = type;
 130         def_callback->callback = callback;
 131         add_ptr_list(&callbacks, def_callback);
 132 }
 133
 134 /*
 135  * These call backs are used when the --info option is turned on to print struct
 136  * member information.  For example foo->bar could have a state in
 137  * smatch_extra.c and also check_user.c.
 138  */
 139 void add_member_info_callback(int owner, void (*callback)(char *fn, int static_flag, int param, char *printed_name, struct smatch_state *state))
 140 {
 141         struct member_info_callback *member_callback = __alloc_member_info_callback(0);
 142
 143         member_callback->owner = owner;
 144         member_callback->callback = callback;
 145         add_ptr_list(&member_callbacks, member_callback);
 146 }
 147
 148 void add_returned_state_callback(void (*fn)(int return_id, char *return_ranges, struct expression *returned_expr, struct state_list *slist))
 149 {
 150         struct returned_state_callback *callback = __alloc_returned_state_callback(0);
 151
 152         callback->callback = fn;
 153         add_ptr_list(&returned_state_callbacks, callback);
 154 }
 155
 156 void add_returned_member_callback(int owner, void (*callback)(int return_id, char *return_ranges, char *printed_name, struct smatch_state *state))
 157 {
 158         struct returned_member_callback *member_callback = __alloc_returned_member_callback(0);
 159
 160         member_callback->owner = owner;
 161         member_callback->callback = callback;
 162         add_ptr_list(&returned_member_callbacks, member_callback);
 163 }
 164
 165 void add_db_fn_call_callback(int type, void (*callback)(struct expression *arg, char *value))
 166 {
 167         struct call_implies_callback *cb = __alloc_call_implies_callback(0);
 168
 169         cb->type = type;
 170         cb->callback = callback;
 171         add_ptr_list(&call_implies_cb_list, cb);
 172 }
 173
 174 static struct symbol *return_type;
 175 static struct range_list *return_range_list;
 176 static int db_return_callback(void *unused, int argc, char **argv, char **azColName)
 177 {
 178         if (argc != 1)
 179                 return 0;
 180         if (option_debug)
 181                 sm_msg("return type %d", type_positive_bits(return_type));
 182         str_to_rl(return_type, argv[0], &return_range_list);
 183         return 0;
 184 }
 185
 186 struct range_list *db_return_vals(struct expression *expr)
 187 {
 188         struct symbol *sym;
 189         static char sql_filter[1024];
 190
 191         if (expr->type != EXPR_CALL)
 192                 return NULL;
 193         if (expr->fn->type != EXPR_SYMBOL)
 194                 return NULL;
 195         return_type = get_type(expr);
 196         if (!return_type)
 197                 return NULL;
 198         sym = expr->fn->symbol;
 199         if (!sym)
 200                 return NULL;
 201
 202         if (sym->ctype.modifiers & MOD_STATIC) {
 203                 snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
 204                          get_filename(), sym->ident->name);
 205         } else {
 206                 snprintf(sql_filter, 1024, "function = '%s' and static = 0;",
 207                                 sym->ident->name);
 208         }
 209
 210         return_range_list = NULL;
 211         run_sql(db_return_callback, "select return from return_values where %s",
 212                  sql_filter);
 213         return return_range_list;
 214 }
 215
 216 static void match_call_marker(struct expression *expr)
 217 {
 218         char *name;
 219
 220         /*
 221          * we just want to record something in the database so that if we have
 222          * two calls like:  frob(4); frob(some_unkown); then on the receiving
 223          * side we know that sometimes frob is called with unknown parameters.
 224          */
 225
 226         name = get_fnptr_name(expr->fn);
 227         if (!name)
 228                 return;
 229         sql_insert_caller_info(name, is_static(expr->fn), INTERNAL, -1, "%call_marker%", "");
 230         free_string(name);
 231 }
 232
 233 static void print_struct_members(char *fn, int static_flag, struct expression *expr, int param, struct state_list *slist,
 234         void (*callback)(char *fn, int static_flag, int param, char *printed_name, struct smatch_state *state))
 235 {
 236         struct sm_state *sm;
 237         char *name;
 238         struct symbol *sym;
 239         int len;
 240         char printed_name[256];
 241         int is_address = 0;
 242
 243         expr = strip_expr(expr);
 244         if (expr->type == EXPR_PREOP && expr->op == '&') {
 245                 expr = strip_expr(expr->unop);
 246                 is_address = 1;
 247         }
 248
 249         name = expr_to_var_sym(expr, &sym);
 250         if (!name || !sym)
 251                 goto free;
 252
 253         len = strlen(name);
 254         FOR_EACH_PTR(slist, sm) {
 255                 if (sm->sym != sym)
 256                         continue;
 257                 if (strncmp(name, sm->name, len) || sm->name[len] == '\0')
 258                         continue;
 259                 if (is_address)
 260                         snprintf(printed_name, sizeof(printed_name), "$$->%s", sm->name + len + 1);
 261                 else
 262                         snprintf(printed_name, sizeof(printed_name), "$$%s", sm->name + len);
 263                 callback(fn, static_flag, param, printed_name, sm->state);
 264         } END_FOR_EACH_PTR(sm);
 265 free:
 266         free_string(name);
 267 }
 268
 269 static void match_call_info(struct expression *expr)
 270 {
 271         struct member_info_callback *cb;
 272         struct expression *arg;
 273         struct state_list *slist;
 274         char *name;
 275         int i;
 276
 277         name = get_fnptr_name(expr->fn);
 278         if (!name)
 279                 return;
 280
 281         FOR_EACH_PTR(member_callbacks, cb) {
 282                 slist = get_all_states(cb->owner);
 283                 i = 0;
 284                 FOR_EACH_PTR(expr->args, arg) {
 285                         print_struct_members(name, is_static(expr->fn), arg, i, slist, cb->callback);
 286                         i++;
 287                 } END_FOR_EACH_PTR(arg);
 288                 free_slist(&slist);
 289         } END_FOR_EACH_PTR(cb);
 290
 291         free_string(name);
 292 }
 293
 294 static int get_param(int param, char **name, struct symbol **sym)
 295 {
 296         struct symbol *arg;
 297         int i;
 298
 299         i = 0;
 300         FOR_EACH_PTR(cur_func_sym->ctype.base_type->arguments, arg) {
 301                 /*
 302                  * this is a temporary hack to work around a bug (I think in sparse?)
 303                  * 2.6.37-rc1:fs/reiserfs/journal.o
 304                  * If there is a function definition without parameter name found
 305                  * after a function implementation then it causes a crash.
 306                  * int foo() {}
 307                  * int bar(char *);
 308                  */
 309                 if (arg->ident->name < (char *)100)
 310                         continue;
 311                 if (i == param && arg->ident->name) {
 312                         *name = arg->ident->name;
 313                         *sym = arg;
 314                         return TRUE;
 315                 }
 316                 i++;
 317         } END_FOR_EACH_PTR(arg);
 318
 319         return FALSE;
 320 }
 321
 322 static struct state_list *final_states;
 323 static int prev_func_id = -1;
 324 static int db_callback(void *unused, int argc, char **argv, char **azColName)
 325 {
 326         int func_id;
 327         long type;
 328         long param;
 329         char *name = NULL;
 330         struct symbol *sym = NULL;
 331         struct def_callback *def_callback;
 332
 333         if (argc != 5)
 334                 return 0;
 335
 336         func_id = atoi(argv[0]);
 337         errno = 0;
 338         type = strtol(argv[1], NULL, 10);
 339         param = strtol(argv[2], NULL, 10);
 340         if (errno)
 341                 return 0;
 342
 343         if (prev_func_id == -1)
 344                 prev_func_id = func_id;
 345         if (func_id != prev_func_id) {
 346                 merge_slist(&final_states, __pop_fake_cur_slist());
 347                 __push_fake_cur_slist();
 348                 __unnullify_path();
 349                 prev_func_id = func_id;
 350         }
 351
 352         if (type == INTERNAL)
 353                 return 0;
 354         if (param >= 0 && !get_param(param, &name, &sym))
 355                 return 0;
 356
 357         FOR_EACH_PTR(callbacks, def_callback) {
 358                 if (def_callback->hook_type == type)
 359                         def_callback->callback(name, sym, argv[3], argv[4]);
 360         } END_FOR_EACH_PTR(def_callback);
 361
 362         return 0;
 363 }
 364
 365 static void get_direct_callers(struct symbol *sym)
 366 {
 367         char sql_filter[1024];
 368
 369         if (sym->ctype.modifiers & MOD_STATIC) {
 370                 snprintf(sql_filter, 1024,
 371                          "file = '%s' and function = '%s' order by function_id;",
 372                          get_filename(), sym->ident->name);
 373         } else {
 374                 snprintf(sql_filter, 1024,
 375                          "function = '%s' and static = 0 order by function_id;",
 376                          sym->ident->name);
 377         }
 378
 379         run_sql(db_callback, "select function_id, type, parameter, key, value from caller_info"
 380                 " where %s", sql_filter);
 381 }
 382
 383 static char *ptr_name;
 384 static int get_ptr_name(void *unused, int argc, char **argv, char **azColName)
 385 {
 386         if (!ptr_name)
 387                 ptr_name = alloc_string(argv[0]);
 388         return 0;
 389 }
 390
 391 static void get_function_pointer_callers(struct symbol *sym)
 392 {
 393         char sql_filter[1024];
 394
 395         if (sym->ctype.modifiers & MOD_STATIC) {
 396                 snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
 397                          get_filename(), sym->ident->name);
 398         } else {
 399                 snprintf(sql_filter, 1024, "function = '%s';",
 400                          sym->ident->name);
 401         }
 402
 403         ptr_name = NULL;
 404         run_sql(get_ptr_name, "select ptr from function_ptr where %s", sql_filter);
 405         if (!ptr_name)
 406                 return;
 407
 408         run_sql(db_callback, "select function_id, type, parameter, key, value from caller_info"
 409                 " where function = '%s' order by function_id", ptr_name);
 410
 411         free_string(ptr_name);
 412 }
 413
 414 static void match_data_from_db(struct symbol *sym)
 415 {
 416         struct sm_state *sm;
 417
 418         if (!sym || !sym->ident || !sym->ident->name)
 419                 return;
 420
 421         __push_fake_cur_slist();
 422         __unnullify_path();
 423         prev_func_id = -1;
 424
 425         get_direct_callers(sym);
 426         get_function_pointer_callers(sym);
 427
 428         merge_slist(&final_states, __pop_fake_cur_slist());
 429
 430         FOR_EACH_PTR(final_states, sm) {
 431                 __set_sm(sm);
 432         } END_FOR_EACH_PTR(sm);
 433
 434         free_slist(&final_states);
 435 }
 436
 437 static void match_function_assign(struct expression *expr)
 438 {
 439         struct expression *right = expr->right;
 440         struct symbol *sym;
 441         char *fn_name;
 442         char *ptr_name;
 443
 444         if (right->type == EXPR_PREOP && right->op == '&')
 445                 right = strip_expr(right->unop);
 446         if (right->type != EXPR_SYMBOL)
 447                 return;
 448         sym = get_type(right);
 449         if (!sym || sym->type != SYM_FN)
 450                 return;
 451
 452         fn_name = expr_to_var(right);
 453         ptr_name = get_fnptr_name(expr->left);
 454         if (!fn_name || !ptr_name)
 455                 goto free;
 456
 457         sql_insert_function_ptr(fn_name, ptr_name);
 458
 459 free:
 460         free_string(fn_name);
 461         free_string(ptr_name);
 462 }
 463
 464 static struct expression *call_implies_call_expr;
 465 static int call_implies_callbacks(void *unused, int argc, char **argv, char **azColName)
 466 {
 467         struct call_implies_callback *cb;
 468         struct expression *arg = NULL;
 469         int type;
 470         int param;
 471
 472         if (argc != 4)
 473                 return 0;
 474
 475         type = atoi(argv[1]);
 476         param = atoi(argv[2]);
 477
 478         FOR_EACH_PTR(call_implies_cb_list, cb) {
 479                 if (cb->type != type)
 480                         continue;
 481                 if (param != -1) {
 482                         arg = get_argument_from_call_expr(call_implies_call_expr->args, param);
 483                         if (!arg)
 484                                 continue;
 485                 }
 486                 cb->callback(arg, argv[3]);
 487         } END_FOR_EACH_PTR(cb);
 488
 489         return 0;
 490 }
 491
 492 static void match_call_implies(struct expression *expr)
 493 {
 494         struct symbol *sym;
 495         static char sql_filter[1024];
 496
 497         if (expr->fn->type != EXPR_SYMBOL)
 498                 return;
 499         sym = expr->fn->symbol;
 500         if (!sym)
 501                 return;
 502
 503         if (sym->ctype.modifiers & MOD_STATIC) {
 504                 snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
 505                          get_filename(), sym->ident->name);
 506         } else {
 507                 snprintf(sql_filter, 1024, "function = '%s' and static = 0;",
 508                                 sym->ident->name);
 509         }
 510
 511         call_implies_call_expr = expr;
 512         run_sql(call_implies_callbacks,
 513                 "select function, type, parameter, value from call_implies where %s",
 514                 sql_filter);
 515         return;
 516 }
 517
 518 static void print_initializer_list(struct expression_list *expr_list,
 519                 struct symbol *struct_type)
 520 {
 521         struct expression *expr;
 522         struct symbol *base_type;
 523         char struct_name[256];
 524
 525         FOR_EACH_PTR(expr_list, expr) {
 526                 if (expr->type == EXPR_INDEX && expr->idx_expression && expr->idx_expression->type == EXPR_INITIALIZER) {
 527                         print_initializer_list(expr->idx_expression->expr_list, struct_type);
 528                         continue;
 529                 }
 530                 if (expr->type != EXPR_IDENTIFIER)
 531                         continue;
 532                 if (!expr->expr_ident)
 533                         continue;
 534                 if (!expr->ident_expression || !expr->ident_expression->symbol_name)
 535                         continue;
 536                 base_type = get_type(expr->ident_expression);
 537                 if (!base_type || base_type->type != SYM_FN)
 538                         continue;
 539                 snprintf(struct_name, sizeof(struct_name), "(struct %s)->%s",
 540                          struct_type->ident->name, expr->expr_ident->name);
 541                 sql_insert_function_ptr(expr->ident_expression->symbol_name->name,
 542                                         struct_name);
 543         } END_FOR_EACH_PTR(expr);
 544 }
 545
 546 static void global_variable(struct symbol *sym)
 547 {
 548         struct symbol *struct_type;
 549
 550         if (!sym->ident)
 551                 return;
 552         if (!sym->initializer || sym->initializer->type != EXPR_INITIALIZER)
 553                 return;
 554         struct_type = get_base_type(sym);
 555         if (!struct_type)
 556                 return;
 557         if (struct_type->type == SYM_ARRAY) {
 558                 struct_type = get_base_type(struct_type);
 559                 if (!struct_type)
 560                         return;
 561         }
 562         if (struct_type->type != SYM_STRUCT || !struct_type->ident)
 563                 return;
 564         print_initializer_list(sym->initializer->expr_list, struct_type);
 565 }
 566
 567 static void match_return_info(int return_id, char *return_ranges, struct expression *expr, struct state_list *slist)
 568 {
 569         sql_insert_return_states(return_id, return_ranges, INTERNAL, -1, "", "");
 570 }
 571
 572 static int return_id;
 573 static void match_function_def(struct symbol *sym)
 574 {
 575         return_id = 0;
 576 }
 577
 578 static void call_return_state_hooks_compare(struct expression *expr)
 579 {
 580         struct returned_state_callback *cb;
 581         struct state_list *slist;
 582         char *return_ranges;
 583         int final_pass_orig = final_pass;
 584
 585         __push_fake_cur_slist();
 586
 587         final_pass = 0;
 588         __split_whole_condition(expr);
 589         final_pass = final_pass_orig;
 590
 591         return_ranges = alloc_sname("1");
 592
 593         return_id++;
 594         slist = __get_cur_slist();
 595         FOR_EACH_PTR(returned_state_callbacks, cb) {
 596                 cb->callback(return_id, return_ranges, expr, slist);
 597         } END_FOR_EACH_PTR(cb);
 598
 599         __push_true_states();
 600         __use_false_states();
 601
 602         return_ranges = alloc_sname("0");;
 603         return_id++;
 604         slist = __get_cur_slist();
 605         FOR_EACH_PTR(returned_state_callbacks, cb) {
 606                 cb->callback(return_id, return_ranges, expr, slist);
 607         } END_FOR_EACH_PTR(cb);
 608
 609         __merge_true_states();
 610         __pop_fake_cur_slist();
 611 }
 612
 613 static int call_return_state_hooks_split_possible(struct expression *expr)
 614 {
 615         struct returned_state_callback *cb;
 616         struct state_list *slist;
 617         struct range_list *rl;
 618         char *return_ranges;
 619         struct sm_state *sm;
 620         struct sm_state *tmp;
 621         int ret = 0;
 622         int nr_possible, nr_states;
 623
 624         sm = get_sm_state_expr(SMATCH_EXTRA, expr);
 625         if (!sm || !sm->merged)
 626                 return 0;
 627
 628         /* bail if it gets too complicated */
 629         nr_possible = ptr_list_size((struct ptr_list *)sm->possible);
 630         nr_states = ptr_list_size((struct ptr_list *)__get_cur_slist());
 631         if (nr_possible >= 100)
 632                 return 0;
 633         if (nr_states * nr_possible >= 1000)
 634                 return 0;
 635
 636         FOR_EACH_PTR(sm->possible, tmp) {
 637                 if (tmp->merged)
 638                         continue;
 639
 640                 ret = 1;
 641                 __push_fake_cur_slist();
 642
 643                 overwrite_states_using_pool(tmp);
 644
 645                 rl = cast_rl(cur_func_return_type(), estate_rl(tmp->state));
 646                 return_ranges = show_rl(rl);
 647
 648                 return_id++;
 649                 slist = __get_cur_slist();
 650                 FOR_EACH_PTR(returned_state_callbacks, cb) {
 651                         cb->callback(return_id, return_ranges, expr, slist);
 652                 } END_FOR_EACH_PTR(cb);
 653
 654                 __pop_fake_cur_slist();
 655         } END_FOR_EACH_PTR(tmp);
 656
 657         return ret;
 658 }
 659
 660 static void call_return_state_hooks(struct expression *expr)
 661 {
 662         struct returned_state_callback *cb;
 663         struct state_list *slist;
 664         struct range_list *rl;
 665         char *return_ranges;
 666         int nr_states;
 667
 668         expr = strip_expr(expr);
 669
 670         if (!expr) {
 671                 return_ranges = alloc_sname("");
 672         } else if (is_condition(expr)) {
 673                 call_return_state_hooks_compare(expr);
 674                 return;
 675         } else if (call_return_state_hooks_split_possible(expr)) {
 676                 return;
 677         } else if (get_implied_rl(expr, &rl)) {
 678                 rl = cast_rl(cur_func_return_type(), rl);
 679                 return_ranges = show_rl(rl);
 680         } else {
 681                 rl = alloc_whole_rl(cur_func_return_type());
 682                 return_ranges = show_rl(rl);
 683         }
 684
 685         return_id++;
 686         slist = __get_cur_slist();
 687         nr_states = ptr_list_size((struct ptr_list *)__get_cur_slist());
 688         FOR_EACH_PTR(returned_state_callbacks, cb) {
 689                 if (nr_states < 10000)
 690                         cb->callback(return_id, return_ranges, expr, slist);
 691                 else
 692                         cb->callback(return_id, return_ranges, expr, NULL);
 693         } END_FOR_EACH_PTR(cb);
 694 }
 695
 696 static void print_returned_struct_members(int return_id, char *return_ranges, struct expression *expr, struct state_list *slist)
 697 {
 698         struct returned_member_callback *cb;
 699         struct state_list *my_slist;
 700         struct sm_state *sm;
 701         struct symbol *type;
 702         char *name;
 703         char member_name[256];
 704         int len;
 705
 706         type = get_type(expr);
 707         if (!type || type->type != SYM_PTR)
 708                 return;
 709         type = get_real_base_type(type);
 710         if (!type || type->type != SYM_STRUCT)
 711                 return;
 712         name = expr_to_var(expr);
 713         if (!name)
 714                 return;
 715
 716         member_name[sizeof(member_name) - 1] = '\0';
 717         strcpy(member_name, "$$");
 718
 719         len = strlen(name);
 720         FOR_EACH_PTR(returned_member_callbacks, cb) {
 721                 my_slist = get_all_states_slist(cb->owner, slist);
 722                 FOR_EACH_PTR(my_slist, sm) {
 723                         if (strncmp(sm->name, name, len) != 0)
 724                                 continue;
 725                         if (strncmp(sm->name + len, "->", 2) != 0)
 726                                 continue;
 727                         strncpy(member_name + 2, sm->name + len, sizeof(member_name) - 2);
 728                         cb->callback(return_id, return_ranges, member_name, sm->state);
 729                 } END_FOR_EACH_PTR(sm);
 730                 free_slist(&my_slist);
 731         } END_FOR_EACH_PTR(cb);
 732
 733         free_string(name);
 734 }
 735
 736 static void match_end_func_info(struct symbol *sym)
 737 {
 738         if (__path_is_null())
 739                 return;
 740         call_return_state_hooks(NULL);
 741 }
 742
 743 void open_smatch_db(void)
 744 {
 745 #ifdef SQLITE_OPEN_READONLY
 746         int rc;
 747
 748         if (option_no_db)
 749                 return;
 750
 751         rc = sqlite3_open_v2("smatch_db.sqlite", &db, SQLITE_OPEN_READONLY, NULL);
 752         if (rc != SQLITE_OK) {
 753                 option_no_db = 1;
 754                 return;
 755         }
 756         return;
 757 #else
 758         option_no_db = 1;
 759         return;
 760 #endif
 761 }
 762
 763 void register_definition_db_callbacks(int id)
 764 {
 765         add_hook(&match_function_def, FUNC_DEF_HOOK);
 766
 767         if (option_info) {
 768                 add_hook(&match_call_info, FUNCTION_CALL_HOOK);
 769                 add_hook(&match_function_assign, ASSIGNMENT_HOOK);
 770                 add_hook(&match_function_assign, GLOBAL_ASSIGNMENT_HOOK);
 771                 add_hook(&global_variable, BASE_HOOK);
 772                 add_hook(&global_variable, DECLARATION_HOOK);
 773                 add_returned_state_callback(match_return_info);
 774                 add_returned_state_callback(print_returned_struct_members);
 775                 add_hook(&call_return_state_hooks, RETURN_HOOK);
 776                 add_hook(&match_end_func_info, END_FUNC_HOOK);
 777         }
 778
 779         if (option_no_db)
 780                 return;
 781
 782         add_hook(&match_data_from_db, FUNC_DEF_HOOK);
 783         add_hook(&match_call_implies, FUNCTION_CALL_HOOK);
 784 }
 785
 786 void register_db_call_marker(int id)
 787 {
 788         if (!option_info)
 789                 return;
 790         add_hook(&match_call_marker, FUNCTION_CALL_HOOK);
 791 }
 792
 793 char *get_variable_from_key(struct expression *arg, char *key, struct symbol **sym)
 794 {
 795         char buf[256];
 796         char *tmp;
 797
 798         if (strcmp(key, "$$") == 0)
 799                 return expr_to_var_sym(arg, sym);
 800
 801         if (strcmp(key, "*$$") == 0) {
 802                 if (arg->type == EXPR_PREOP && arg->op == '&') {
 803                         arg = strip_expr(arg->unop);
 804                         return expr_to_var_sym(arg, sym);
 805                 } else {
 806                         tmp = expr_to_var_sym(arg, sym);
 807                         if (!tmp)
 808                                 return NULL;
 809                         snprintf(buf, sizeof(buf), "*%s", tmp);
 810                         free_string(tmp);
 811                         return alloc_string(buf);
 812                 }
 813         }
 814
 815         if (arg->type == EXPR_PREOP && arg->op == '&') {
 816                 arg = strip_expr(arg->unop);
 817                 tmp = expr_to_var_sym(arg, sym);
 818                 if (!tmp)
 819                         return NULL;
 820                 snprintf(buf, sizeof(buf), "%s.%s", tmp, key + 4);
 821                 return alloc_string(buf);
 822         }
 823
 824         tmp = expr_to_var_sym(arg, sym);
 825         if (!tmp)
 826                 return NULL;
 827         snprintf(buf, sizeof(buf), "%s%s", tmp, key + 2);
 828         free_string(tmp);
 829         return alloc_string(buf);
 830 }
 831
 832