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 <unistd.h>
  14 #include "smatch.h"
  15 #include "smatch_slist.h"
  16 #include "smatch_extra.h"
  17
  18 static sqlite3 *db;
  19 static sqlite3 *mem_db;
  20
  21 #define sql_insert(table, values...)                                            \
  22 do {                                                                            \
  23         if (option_info) {                                                      \
  24                 sm_prefix();                                                    \
  25                 sm_printf("SQL: insert into " #table " values (" values);       \
  26                 sm_printf(");\n");                                              \
  27         }                                                                       \
  28 } while (0)
  29
  30 struct def_callback {
  31         int hook_type;
  32         void (*callback)(const char *name, struct symbol *sym, char *key, char *value);
  33 };
  34 ALLOCATOR(def_callback, "definition db hook callbacks");
  35 DECLARE_PTR_LIST(callback_list, struct def_callback);
  36 static struct callback_list *callbacks;
  37
  38 struct member_info_callback {
  39         int owner;
  40         void (*callback)(struct expression *call, int param, char *printed_name, struct smatch_state *state);
  41 };
  42 ALLOCATOR(member_info_callback, "caller_info callbacks");
  43 DECLARE_PTR_LIST(member_info_cb_list, struct member_info_callback);
  44 static struct member_info_cb_list *member_callbacks;
  45
  46 struct returned_state_callback {
  47         void (*callback)(int return_id, char *return_ranges, struct expression *return_expr, struct state_list *slist);
  48 };
  49 ALLOCATOR(returned_state_callback, "returned state callbacks");
  50 DECLARE_PTR_LIST(returned_state_cb_list, struct returned_state_callback);
  51 static struct returned_state_cb_list *returned_state_callbacks;
  52
  53 struct returned_member_callback {
  54         int owner;
  55         void (*callback)(int return_id, char *return_ranges, char *printed_name, struct smatch_state *state);
  56 };
  57 ALLOCATOR(returned_member_callback, "returned member callbacks");
  58 DECLARE_PTR_LIST(returned_member_cb_list, struct returned_member_callback);
  59 static struct returned_member_cb_list *returned_member_callbacks;
  60
  61 struct call_implies_callback {
  62         int type;
  63         void (*callback)(struct expression *arg, char *value);
  64 };
  65 ALLOCATOR(call_implies_callback, "call_implies callbacks");
  66 DECLARE_PTR_LIST(call_implies_cb_list, struct call_implies_callback);
  67 static struct call_implies_cb_list *call_implies_cb_list;
  68
  69 void sql_exec(int (*callback)(void*, int, char**, char**), const char *sql)
  70 {
  71         char *err = NULL;
  72         int rc;
  73
  74         if (option_no_db || !db)
  75                 return;
  76
  77         rc = sqlite3_exec(db, sql, callback, 0, &err);
  78         if (rc != SQLITE_OK) {
  79                 fprintf(stderr, "SQL error #2: %s\n", err);
  80                 fprintf(stderr, "SQL: '%s'\n", sql);
  81         }
  82 }
  83
  84 void sql_insert_return_states(int return_id, const char *return_ranges,
  85                 int type, int param, const char *key, const char *value)
  86 {
  87         sql_insert(return_states, "'%s', '%s', %d, '%s', %d, %d, %d, '%s', '%s'",
  88                    get_filename(), get_function(), return_id, return_ranges,
  89                    fn_static(), type, param, key, value);
  90 }
  91
  92 void sql_insert_caller_info(struct expression *call, int type,
  93                 int param, const char *key, const char *value)
  94 {
  95         char *fn;
  96
  97         if (!option_info)
  98                 return;
  99
 100         fn = get_fnptr_name(call->fn);
 101         if (!fn)
 102                 return;
 103
 104         sm_msg("SQL_caller_info: insert into caller_info values ("
 105                "'%s', '%s', '%s', %%FUNC_ID%%, %d, %d, %d, '%s', '%s');",
 106                get_filename(), get_function(), fn, is_static(call->fn),
 107                type, param, key, value);
 108
 109         free_string(fn);
 110 }
 111
 112 void sql_insert_function_ptr(const char *fn, const char *struct_name)
 113 {
 114         sql_insert(function_ptr, "'%s', '%s', '%s'", get_filename(), fn,
 115                    struct_name);
 116 }
 117
 118 void sql_insert_return_values(const char *return_values)
 119 {
 120         sql_insert(return_values, "'%s', '%s', %d, '%s'", get_filename(),
 121                    get_function(), fn_static(), return_values);
 122 }
 123
 124 void sql_insert_call_implies(int type, int param, int value)
 125 {
 126         sql_insert(call_implies, "'%s', '%s', %d, %d, %d, %d", get_filename(),
 127                    get_function(), fn_static(), type, param, value);
 128 }
 129
 130 void sql_insert_type_size(const char *member, int size)
 131 {
 132         sql_insert(type_size, "'%s', '%s', %d", get_filename(), member, size);
 133 }
 134
 135 void add_definition_db_callback(void (*callback)(const char *name, struct symbol *sym, char *key, char *value), int type)
 136 {
 137         struct def_callback *def_callback = __alloc_def_callback(0);
 138
 139         def_callback->hook_type = type;
 140         def_callback->callback = callback;
 141         add_ptr_list(&callbacks, def_callback);
 142 }
 143
 144 /*
 145  * These call backs are used when the --info option is turned on to print struct
 146  * member information.  For example foo->bar could have a state in
 147  * smatch_extra.c and also check_user.c.
 148  */
 149 void add_member_info_callback(int owner, void (*callback)(struct expression *call, int param, char *printed_name, struct smatch_state *state))
 150 {
 151         struct member_info_callback *member_callback = __alloc_member_info_callback(0);
 152
 153         member_callback->owner = owner;
 154         member_callback->callback = callback;
 155         add_ptr_list(&member_callbacks, member_callback);
 156 }
 157
 158 void add_returned_state_callback(void (*fn)(int return_id, char *return_ranges, struct expression *returned_expr, struct state_list *slist))
 159 {
 160         struct returned_state_callback *callback = __alloc_returned_state_callback(0);
 161
 162         callback->callback = fn;
 163         add_ptr_list(&returned_state_callbacks, callback);
 164 }
 165
 166 void add_returned_member_callback(int owner, void (*callback)(int return_id, char *return_ranges, char *printed_name, struct smatch_state *state))
 167 {
 168         struct returned_member_callback *member_callback = __alloc_returned_member_callback(0);
 169
 170         member_callback->owner = owner;
 171         member_callback->callback = callback;
 172         add_ptr_list(&returned_member_callbacks, member_callback);
 173 }
 174
 175 void add_db_fn_call_callback(int type, void (*callback)(struct expression *arg, char *value))
 176 {
 177         struct call_implies_callback *cb = __alloc_call_implies_callback(0);
 178
 179         cb->type = type;
 180         cb->callback = callback;
 181         add_ptr_list(&call_implies_cb_list, cb);
 182 }
 183
 184 static struct symbol *return_type;
 185 static struct range_list *return_range_list;
 186 static int db_return_callback(void *unused, int argc, char **argv, char **azColName)
 187 {
 188         if (argc != 1)
 189                 return 0;
 190         if (option_debug)
 191                 sm_msg("return type %d", type_positive_bits(return_type));
 192         str_to_rl(return_type, argv[0], &return_range_list);
 193         return 0;
 194 }
 195
 196 struct range_list *db_return_vals(struct expression *expr)
 197 {
 198         struct symbol *sym;
 199         static char sql_filter[1024];
 200
 201         if (expr->type != EXPR_CALL)
 202                 return NULL;
 203         if (expr->fn->type != EXPR_SYMBOL)
 204                 return NULL;
 205         return_type = get_type(expr);
 206         if (!return_type)
 207                 return NULL;
 208         sym = expr->fn->symbol;
 209         if (!sym)
 210                 return NULL;
 211
 212         if (sym->ctype.modifiers & MOD_STATIC) {
 213                 snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
 214                          get_filename(), sym->ident->name);
 215         } else {
 216                 snprintf(sql_filter, 1024, "function = '%s' and static = 0;",
 217                                 sym->ident->name);
 218         }
 219
 220         return_range_list = NULL;
 221         run_sql(db_return_callback, "select return from return_values where %s",
 222                  sql_filter);
 223         return return_range_list;
 224 }
 225
 226 static void match_call_marker(struct expression *expr)
 227 {
 228         /*
 229          * we just want to record something in the database so that if we have
 230          * two calls like:  frob(4); frob(some_unkown); then on the receiving
 231          * side we know that sometimes frob is called with unknown parameters.
 232          */
 233
 234         sql_insert_caller_info(expr, INTERNAL, -1, "%call_marker%", "");
 235 }
 236
 237 static void print_struct_members(struct expression *call, struct expression *expr, int param, struct state_list *slist,
 238         void (*callback)(struct expression *call, int param, char *printed_name, struct smatch_state *state))
 239 {
 240         struct sm_state *sm;
 241         char *name;
 242         struct symbol *sym;
 243         int len;
 244         char printed_name[256];
 245         int is_address = 0;
 246
 247         expr = strip_expr(expr);
 248         if (expr->type == EXPR_PREOP && expr->op == '&') {
 249                 expr = strip_expr(expr->unop);
 250                 is_address = 1;
 251         }
 252
 253         name = expr_to_var_sym(expr, &sym);
 254         if (!name || !sym)
 255                 goto free;
 256
 257         len = strlen(name);
 258         FOR_EACH_PTR(slist, sm) {
 259                 if (sm->sym != sym)
 260                         continue;
 261                 if (strncmp(name, sm->name, len) || sm->name[len] == '\0')
 262                         continue;
 263                 if (is_address)
 264                         snprintf(printed_name, sizeof(printed_name), "$$->%s", sm->name + len + 1);
 265                 else
 266                         snprintf(printed_name, sizeof(printed_name), "$$%s", sm->name + len);
 267                 callback(call, param, printed_name, sm->state);
 268         } END_FOR_EACH_PTR(sm);
 269 free:
 270         free_string(name);
 271 }
 272
 273 static void match_call_info(struct expression *call)
 274 {
 275         struct member_info_callback *cb;
 276         struct expression *arg;
 277         struct state_list *slist;
 278         char *name;
 279         int i;
 280
 281         name = get_fnptr_name(call->fn);
 282         if (!name)
 283                 return;
 284
 285         FOR_EACH_PTR(member_callbacks, cb) {
 286                 slist = get_all_states(cb->owner);
 287                 i = 0;
 288                 FOR_EACH_PTR(call->args, arg) {
 289                         print_struct_members(call, arg, i, slist, cb->callback);
 290                         i++;
 291                 } END_FOR_EACH_PTR(arg);
 292                 free_slist(&slist);
 293         } END_FOR_EACH_PTR(cb);
 294
 295         free_string(name);
 296 }
 297
 298 static int get_param(int param, char **name, struct symbol **sym)
 299 {
 300         struct symbol *arg;
 301         int i;
 302
 303         i = 0;
 304         FOR_EACH_PTR(cur_func_sym->ctype.base_type->arguments, arg) {
 305                 /*
 306                  * this is a temporary hack to work around a bug (I think in sparse?)
 307                  * 2.6.37-rc1:fs/reiserfs/journal.o
 308                  * If there is a function definition without parameter name found
 309                  * after a function implementation then it causes a crash.
 310                  * int foo() {}
 311                  * int bar(char *);
 312                  */
 313                 if (arg->ident->name < (char *)100)
 314                         continue;
 315                 if (i == param && arg->ident->name) {
 316                         *name = arg->ident->name;
 317                         *sym = arg;
 318                         return TRUE;
 319                 }
 320                 i++;
 321         } END_FOR_EACH_PTR(arg);
 322
 323         return FALSE;
 324 }
 325
 326 static struct state_list *final_states;
 327 static int prev_func_id = -1;
 328 static int db_callback(void *unused, int argc, char **argv, char **azColName)
 329 {
 330         int func_id;
 331         long type;
 332         long param;
 333         char *name = NULL;
 334         struct symbol *sym = NULL;
 335         struct def_callback *def_callback;
 336
 337         if (argc != 5)
 338                 return 0;
 339
 340         func_id = atoi(argv[0]);
 341         errno = 0;
 342         type = strtol(argv[1], NULL, 10);
 343         param = strtol(argv[2], NULL, 10);
 344         if (errno)
 345                 return 0;
 346
 347         if (prev_func_id == -1)
 348                 prev_func_id = func_id;
 349         if (func_id != prev_func_id) {
 350                 merge_slist(&final_states, __pop_fake_cur_slist());
 351                 __push_fake_cur_slist();
 352                 __unnullify_path();
 353                 prev_func_id = func_id;
 354         }
 355
 356         if (type == INTERNAL)
 357                 return 0;
 358         if (param >= 0 && !get_param(param, &name, &sym))
 359                 return 0;
 360
 361         FOR_EACH_PTR(callbacks, def_callback) {
 362                 if (def_callback->hook_type == type)
 363                         def_callback->callback(name, sym, argv[3], argv[4]);
 364         } END_FOR_EACH_PTR(def_callback);
 365
 366         return 0;
 367 }
 368
 369 static void get_direct_callers(struct symbol *sym)
 370 {
 371         char sql_filter[1024];
 372
 373         if (sym->ctype.modifiers & MOD_STATIC) {
 374                 snprintf(sql_filter, 1024,
 375                          "file = '%s' and function = '%s' order by function_id;",
 376                          get_filename(), sym->ident->name);
 377         } else {
 378                 snprintf(sql_filter, 1024,
 379                          "function = '%s' and static = 0 order by function_id;",
 380                          sym->ident->name);
 381         }
 382
 383         run_sql(db_callback, "select function_id, type, parameter, key, value from caller_info"
 384                 " where %s", sql_filter);
 385 }
 386
 387 static char *ptr_name;
 388 static int get_ptr_name(void *unused, int argc, char **argv, char **azColName)
 389 {
 390         if (!ptr_name)
 391                 ptr_name = alloc_string(argv[0]);
 392         return 0;
 393 }
 394
 395 static void get_function_pointer_callers(struct symbol *sym)
 396 {
 397         char sql_filter[1024];
 398
 399         if (sym->ctype.modifiers & MOD_STATIC) {
 400                 snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
 401                          get_filename(), sym->ident->name);
 402         } else {
 403                 snprintf(sql_filter, 1024, "function = '%s';",
 404                          sym->ident->name);
 405         }
 406
 407         ptr_name = NULL;
 408         run_sql(get_ptr_name, "select ptr from function_ptr where %s", sql_filter);
 409         if (!ptr_name)
 410                 return;
 411
 412         run_sql(db_callback, "select function_id, type, parameter, key, value from caller_info"
 413                 " where function = '%s' order by function_id", ptr_name);
 414
 415         free_string(ptr_name);
 416 }
 417
 418 static void match_data_from_db(struct symbol *sym)
 419 {
 420         struct sm_state *sm;
 421
 422         if (!sym || !sym->ident || !sym->ident->name)
 423                 return;
 424
 425         __push_fake_cur_slist();
 426         __unnullify_path();
 427         prev_func_id = -1;
 428
 429         get_direct_callers(sym);
 430         get_function_pointer_callers(sym);
 431
 432         merge_slist(&final_states, __pop_fake_cur_slist());
 433
 434         FOR_EACH_PTR(final_states, sm) {
 435                 __set_sm(sm);
 436         } END_FOR_EACH_PTR(sm);
 437
 438         free_slist(&final_states);
 439 }
 440
 441 static void match_function_assign(struct expression *expr)
 442 {
 443         struct expression *right = expr->right;
 444         struct symbol *sym;
 445         char *fn_name;
 446         char *ptr_name;
 447
 448         if (right->type == EXPR_PREOP && right->op == '&')
 449                 right = strip_expr(right->unop);
 450         if (right->type != EXPR_SYMBOL)
 451                 return;
 452         sym = get_type(right);
 453         if (!sym || sym->type != SYM_FN)
 454                 return;
 455
 456         fn_name = expr_to_var(right);
 457         ptr_name = get_fnptr_name(expr->left);
 458         if (!fn_name || !ptr_name)
 459                 goto free;
 460
 461         sql_insert_function_ptr(fn_name, ptr_name);
 462
 463 free:
 464         free_string(fn_name);
 465         free_string(ptr_name);
 466 }
 467
 468 static struct expression *call_implies_call_expr;
 469 static int call_implies_callbacks(void *unused, int argc, char **argv, char **azColName)
 470 {
 471         struct call_implies_callback *cb;
 472         struct expression *arg = NULL;
 473         int type;
 474         int param;
 475
 476         if (argc != 4)
 477                 return 0;
 478
 479         type = atoi(argv[1]);
 480         param = atoi(argv[2]);
 481
 482         FOR_EACH_PTR(call_implies_cb_list, cb) {
 483                 if (cb->type != type)
 484                         continue;
 485                 if (param != -1) {
 486                         arg = get_argument_from_call_expr(call_implies_call_expr->args, param);
 487                         if (!arg)
 488                                 continue;
 489                 }
 490                 cb->callback(arg, argv[3]);
 491         } END_FOR_EACH_PTR(cb);
 492
 493         return 0;
 494 }
 495
 496 static void match_call_implies(struct expression *expr)
 497 {
 498         struct symbol *sym;
 499         static char sql_filter[1024];
 500
 501         if (expr->fn->type != EXPR_SYMBOL)
 502                 return;
 503         sym = expr->fn->symbol;
 504         if (!sym)
 505                 return;
 506
 507         if (sym->ctype.modifiers & MOD_STATIC) {
 508                 snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
 509                          get_filename(), sym->ident->name);
 510         } else {
 511                 snprintf(sql_filter, 1024, "function = '%s' and static = 0;",
 512                                 sym->ident->name);
 513         }
 514
 515         call_implies_call_expr = expr;
 516         run_sql(call_implies_callbacks,
 517                 "select function, type, parameter, value from call_implies where %s",
 518                 sql_filter);
 519         return;
 520 }
 521
 522 static void print_initializer_list(struct expression_list *expr_list,
 523                 struct symbol *struct_type)
 524 {
 525         struct expression *expr;
 526         struct symbol *base_type;
 527         char struct_name[256];
 528
 529         FOR_EACH_PTR(expr_list, expr) {
 530                 if (expr->type == EXPR_INDEX && expr->idx_expression && expr->idx_expression->type == EXPR_INITIALIZER) {
 531                         print_initializer_list(expr->idx_expression->expr_list, struct_type);
 532                         continue;
 533                 }
 534                 if (expr->type != EXPR_IDENTIFIER)
 535                         continue;
 536                 if (!expr->expr_ident)
 537                         continue;
 538                 if (!expr->ident_expression || !expr->ident_expression->symbol_name)
 539                         continue;
 540                 base_type = get_type(expr->ident_expression);
 541                 if (!base_type || base_type->type != SYM_FN)
 542                         continue;
 543                 snprintf(struct_name, sizeof(struct_name), "(struct %s)->%s",
 544                          struct_type->ident->name, expr->expr_ident->name);
 545                 sql_insert_function_ptr(expr->ident_expression->symbol_name->name,
 546                                         struct_name);
 547         } END_FOR_EACH_PTR(expr);
 548 }
 549
 550 static void global_variable(struct symbol *sym)
 551 {
 552         struct symbol *struct_type;
 553
 554         if (!sym->ident)
 555                 return;
 556         if (!sym->initializer || sym->initializer->type != EXPR_INITIALIZER)
 557                 return;
 558         struct_type = get_base_type(sym);
 559         if (!struct_type)
 560                 return;
 561         if (struct_type->type == SYM_ARRAY) {
 562                 struct_type = get_base_type(struct_type);
 563                 if (!struct_type)
 564                         return;
 565         }
 566         if (struct_type->type != SYM_STRUCT || !struct_type->ident)
 567                 return;
 568         print_initializer_list(sym->initializer->expr_list, struct_type);
 569 }
 570
 571 static void match_return_info(int return_id, char *return_ranges, struct expression *expr, struct state_list *slist)
 572 {
 573         sql_insert_return_states(return_id, return_ranges, INTERNAL, -1, "", "");
 574 }
 575
 576 static int return_id;
 577 static void match_function_def(struct symbol *sym)
 578 {
 579         return_id = 0;
 580 }
 581
 582 static void call_return_state_hooks_compare(struct expression *expr)
 583 {
 584         struct returned_state_callback *cb;
 585         struct state_list *slist;
 586         char *return_ranges;
 587         int final_pass_orig = final_pass;
 588
 589         __push_fake_cur_slist();
 590
 591         final_pass = 0;
 592         __split_whole_condition(expr);
 593         final_pass = final_pass_orig;
 594
 595         return_ranges = alloc_sname("1");
 596
 597         return_id++;
 598         slist = __get_cur_slist();
 599         FOR_EACH_PTR(returned_state_callbacks, cb) {
 600                 cb->callback(return_id, return_ranges, expr, slist);
 601         } END_FOR_EACH_PTR(cb);
 602
 603         __push_true_states();
 604         __use_false_states();
 605
 606         return_ranges = alloc_sname("0");;
 607         return_id++;
 608         slist = __get_cur_slist();
 609         FOR_EACH_PTR(returned_state_callbacks, cb) {
 610                 cb->callback(return_id, return_ranges, expr, slist);
 611         } END_FOR_EACH_PTR(cb);
 612
 613         __merge_true_states();
 614         __pop_fake_cur_slist();
 615 }
 616
 617 static int call_return_state_hooks_split_possible(struct expression *expr)
 618 {
 619         struct returned_state_callback *cb;
 620         struct state_list *slist;
 621         struct range_list *rl;
 622         char *return_ranges;
 623         struct sm_state *sm;
 624         struct sm_state *tmp;
 625         int ret = 0;
 626         int nr_possible, nr_states;
 627
 628         sm = get_sm_state_expr(SMATCH_EXTRA, expr);
 629         if (!sm || !sm->merged)
 630                 return 0;
 631
 632         /* bail if it gets too complicated */
 633         nr_possible = ptr_list_size((struct ptr_list *)sm->possible);
 634         nr_states = ptr_list_size((struct ptr_list *)__get_cur_slist());
 635         if (nr_possible >= 100)
 636                 return 0;
 637         if (nr_states * nr_possible >= 1000)
 638                 return 0;
 639
 640         FOR_EACH_PTR(sm->possible, tmp) {
 641                 if (tmp->merged)
 642                         continue;
 643
 644                 ret = 1;
 645                 __push_fake_cur_slist();
 646
 647                 overwrite_states_using_pool(tmp);
 648
 649                 rl = cast_rl(cur_func_return_type(), estate_rl(tmp->state));
 650                 return_ranges = show_rl(rl);
 651
 652                 return_id++;
 653                 slist = __get_cur_slist();
 654                 FOR_EACH_PTR(returned_state_callbacks, cb) {
 655                         cb->callback(return_id, return_ranges, expr, slist);
 656                 } END_FOR_EACH_PTR(cb);
 657
 658                 __pop_fake_cur_slist();
 659         } END_FOR_EACH_PTR(tmp);
 660
 661         return ret;
 662 }
 663
 664 static void call_return_state_hooks(struct expression *expr)
 665 {
 666         struct returned_state_callback *cb;
 667         struct state_list *slist;
 668         struct range_list *rl;
 669         char *return_ranges;
 670         int nr_states;
 671
 672         expr = strip_expr(expr);
 673
 674         if (!expr) {
 675                 return_ranges = alloc_sname("");
 676         } else if (is_condition(expr)) {
 677                 call_return_state_hooks_compare(expr);
 678                 return;
 679         } else if (call_return_state_hooks_split_possible(expr)) {
 680                 return;
 681         } else if (get_implied_rl(expr, &rl)) {
 682                 rl = cast_rl(cur_func_return_type(), rl);
 683                 return_ranges = show_rl(rl);
 684         } else {
 685                 rl = alloc_whole_rl(cur_func_return_type());
 686                 return_ranges = show_rl(rl);
 687         }
 688
 689         return_id++;
 690         slist = __get_cur_slist();
 691         nr_states = ptr_list_size((struct ptr_list *)__get_cur_slist());
 692         FOR_EACH_PTR(returned_state_callbacks, cb) {
 693                 if (nr_states < 10000)
 694                         cb->callback(return_id, return_ranges, expr, slist);
 695                 else
 696                         cb->callback(return_id, return_ranges, expr, NULL);
 697         } END_FOR_EACH_PTR(cb);
 698 }
 699
 700 static void print_returned_struct_members(int return_id, char *return_ranges, struct expression *expr, struct state_list *slist)
 701 {
 702         struct returned_member_callback *cb;
 703         struct state_list *my_slist;
 704         struct sm_state *sm;
 705         struct symbol *type;
 706         char *name;
 707         char member_name[256];
 708         int len;
 709
 710         type = get_type(expr);
 711         if (!type || type->type != SYM_PTR)
 712                 return;
 713         type = get_real_base_type(type);
 714         if (!type || type->type != SYM_STRUCT)
 715                 return;
 716         name = expr_to_var(expr);
 717         if (!name)
 718                 return;
 719
 720         member_name[sizeof(member_name) - 1] = '\0';
 721         strcpy(member_name, "$$");
 722
 723         len = strlen(name);
 724         FOR_EACH_PTR(returned_member_callbacks, cb) {
 725                 my_slist = get_all_states_slist(cb->owner, slist);
 726                 FOR_EACH_PTR(my_slist, sm) {
 727                         if (strncmp(sm->name, name, len) != 0)
 728                                 continue;
 729                         if (strncmp(sm->name + len, "->", 2) != 0)
 730                                 continue;
 731                         strncpy(member_name + 2, sm->name + len, sizeof(member_name) - 2);
 732                         cb->callback(return_id, return_ranges, member_name, sm->state);
 733                 } END_FOR_EACH_PTR(sm);
 734                 free_slist(&my_slist);
 735         } END_FOR_EACH_PTR(cb);
 736
 737         free_string(name);
 738 }
 739
 740 static void match_end_func_info(struct symbol *sym)
 741 {
 742         if (__path_is_null())
 743                 return;
 744         call_return_state_hooks(NULL);
 745 }
 746
 747 static void init_memdb(void)
 748 {
 749         char *err = NULL;
 750         int rc;
 751         const char *schema_files[] = {
 752                 "db/db.schema",
 753                 "db/caller_info.schema",
 754                 "db/return_states.schema",
 755                 "db/type_size.schema",
 756                 "db/call_implies.schema",
 757                 "db/function_ptr.schema",
 758                 "db/return_values.schema",
 759         };
 760         static char buf[4096];
 761         int fd;
 762         int ret;
 763         int i;
 764
 765         rc = sqlite3_open(":memory:", &mem_db);
 766         if (rc != SQLITE_OK) {
 767                 printf("Error starting In-Memory database.");
 768                 return;
 769         }
 770
 771         for (i = 0; i < ARRAY_SIZE(schema_files); i++) {
 772                 fd = open_data_file(schema_files[i]);
 773                 if (fd < 0)
 774                         continue;
 775                 ret = read(fd, buf, sizeof(buf));
 776                 if (ret == sizeof(buf)) {
 777                         printf("Schema file too large:  %s (limit %ld bytes)",
 778                                schema_files[i], sizeof(buf));
 779                 }
 780                 buf[ret] = '\0';
 781                 rc = sqlite3_exec(mem_db, buf, NULL, 0, &err);
 782                 if (rc != SQLITE_OK) {
 783                         fprintf(stderr, "SQL error #2: %s\n", err);
 784                         fprintf(stderr, "%s\n", buf);
 785                 }
 786         }
 787 }
 788
 789 void open_smatch_db(void)
 790 {
 791         int rc;
 792
 793         if (option_no_db)
 794                 return;
 795
 796         init_memdb();
 797
 798         rc = sqlite3_open_v2("smatch_db.sqlite", &db, SQLITE_OPEN_READONLY, NULL);
 799         if (rc != SQLITE_OK) {
 800                 option_no_db = 1;
 801                 return;
 802         }
 803         return;
 804 }
 805
 806 void register_definition_db_callbacks(int id)
 807 {
 808         add_hook(&match_function_def, FUNC_DEF_HOOK);
 809
 810         if (option_info) {
 811                 add_hook(&match_call_info, FUNCTION_CALL_HOOK);
 812                 add_hook(&match_function_assign, ASSIGNMENT_HOOK);
 813                 add_hook(&match_function_assign, GLOBAL_ASSIGNMENT_HOOK);
 814                 add_hook(&global_variable, BASE_HOOK);
 815                 add_hook(&global_variable, DECLARATION_HOOK);
 816                 add_returned_state_callback(match_return_info);
 817                 add_returned_state_callback(print_returned_struct_members);
 818                 add_hook(&call_return_state_hooks, RETURN_HOOK);
 819                 add_hook(&match_end_func_info, END_FUNC_HOOK);
 820         }
 821
 822         if (option_no_db)
 823                 return;
 824
 825         add_hook(&match_data_from_db, FUNC_DEF_HOOK);
 826         add_hook(&match_call_implies, FUNCTION_CALL_HOOK);
 827 }
 828
 829 void register_db_call_marker(int id)
 830 {
 831         if (!option_info)
 832                 return;
 833         add_hook(&match_call_marker, FUNCTION_CALL_HOOK);
 834 }
 835
 836 char *get_variable_from_key(struct expression *arg, char *key, struct symbol **sym)
 837 {
 838         char buf[256];
 839         char *tmp;
 840
 841         if (strcmp(key, "$$") == 0)
 842                 return expr_to_var_sym(arg, sym);
 843
 844         if (strcmp(key, "*$$") == 0) {
 845                 if (arg->type == EXPR_PREOP && arg->op == '&') {
 846                         arg = strip_expr(arg->unop);
 847                         return expr_to_var_sym(arg, sym);
 848                 } else {
 849                         tmp = expr_to_var_sym(arg, sym);
 850                         if (!tmp)
 851                                 return NULL;
 852                         snprintf(buf, sizeof(buf), "*%s", tmp);
 853                         free_string(tmp);
 854                         return alloc_string(buf);
 855                 }
 856         }
 857
 858         if (arg->type == EXPR_PREOP && arg->op == '&') {
 859                 arg = strip_expr(arg->unop);
 860                 tmp = expr_to_var_sym(arg, sym);
 861                 if (!tmp)
 862                         return NULL;
 863                 snprintf(buf, sizeof(buf), "%s.%s", tmp, key + 4);
 864                 return alloc_string(buf);
 865         }
 866
 867         tmp = expr_to_var_sym(arg, sym);
 868         if (!tmp)
 869                 return NULL;
 870         snprintf(buf, sizeof(buf), "%s%s", tmp, key + 2);
 871         free_string(tmp);
 872         return alloc_string(buf);
 873 }
 874
 875