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 (__inline_fn) {                                                      \
  24                 char buf[1024];                                                 \
  25                 char *err, *p = buf;                                            \
  26                 int rc;                                                         \
  27                                                                                 \
  28                 p += snprintf(p, buf + sizeof(buf) - p,                         \
  29                               "insert into %s values (", #table);               \
  30                 p += snprintf(p, buf + sizeof(buf) - p, values);                \
  31                 p += snprintf(p, buf + sizeof(buf) - p, ");");                  \
  32                 rc = sqlite3_exec(mem_db, buf, NULL, 0, &err);                  \
  33                 if (rc != SQLITE_OK) {                                          \
  34                         fprintf(stderr, "SQL error #2: %s\n", err);             \
  35                         fprintf(stderr, "SQL: '%s'\n", buf);                    \
  36                 }                                                               \
  37                 return;                                                         \
  38         }                                                                       \
  39         if (option_info) {                                                      \
  40                 sm_prefix();                                                    \
  41                 sm_printf("SQL: insert into " #table " values (" values);       \
  42                 sm_printf(");\n");                                              \
  43         }                                                                       \
  44 } while (0)
  45
  46 struct def_callback {
  47         int hook_type;
  48         void (*callback)(const char *name, struct symbol *sym, char *key, char *value);
  49 };
  50 ALLOCATOR(def_callback, "definition db hook callbacks");
  51 DECLARE_PTR_LIST(callback_list, struct def_callback);
  52 static struct callback_list *callbacks;
  53
  54 struct member_info_callback {
  55         int owner;
  56         void (*callback)(struct expression *call, int param, char *printed_name, struct smatch_state *state);
  57 };
  58 ALLOCATOR(member_info_callback, "caller_info callbacks");
  59 DECLARE_PTR_LIST(member_info_cb_list, struct member_info_callback);
  60 static struct member_info_cb_list *member_callbacks;
  61
  62 struct returned_state_callback {
  63         void (*callback)(int return_id, char *return_ranges, struct expression *return_expr, struct state_list *slist);
  64 };
  65 ALLOCATOR(returned_state_callback, "returned state callbacks");
  66 DECLARE_PTR_LIST(returned_state_cb_list, struct returned_state_callback);
  67 static struct returned_state_cb_list *returned_state_callbacks;
  68
  69 struct returned_member_callback {
  70         int owner;
  71         void (*callback)(int return_id, char *return_ranges, char *printed_name, struct smatch_state *state);
  72 };
  73 ALLOCATOR(returned_member_callback, "returned member callbacks");
  74 DECLARE_PTR_LIST(returned_member_cb_list, struct returned_member_callback);
  75 static struct returned_member_cb_list *returned_member_callbacks;
  76
  77 struct call_implies_callback {
  78         int type;
  79         void (*callback)(struct expression *arg, char *value);
  80 };
  81 ALLOCATOR(call_implies_callback, "call_implies callbacks");
  82 DECLARE_PTR_LIST(call_implies_cb_list, struct call_implies_callback);
  83 static struct call_implies_cb_list *call_implies_cb_list;
  84
  85 void sql_exec(int (*callback)(void*, int, char**, char**), const char *sql)
  86 {
  87         char *err = NULL;
  88         int rc;
  89
  90         if (option_no_db || !db)
  91                 return;
  92
  93         rc = sqlite3_exec(db, sql, callback, 0, &err);
  94         if (rc != SQLITE_OK) {
  95                 fprintf(stderr, "SQL error #2: %s\n", err);
  96                 fprintf(stderr, "SQL: '%s'\n", sql);
  97         }
  98 }
  99
 100 void sql_insert_return_states(int return_id, const char *return_ranges,
 101                 int type, int param, const char *key, const char *value)
 102 {
 103         sql_insert(return_states, "'%s', '%s', %d, '%s', %d, %d, %d, '%s', '%s'",
 104                    get_filename(), get_function(), return_id, return_ranges,
 105                    fn_static(), type, param, key, value);
 106 }
 107
 108 void sql_insert_caller_info(struct expression *call, int type,
 109                 int param, const char *key, const char *value)
 110 {
 111         char *fn;
 112
 113         if (!option_info && !__inline_call)
 114                 return;
 115
 116         fn = get_fnptr_name(call->fn);
 117         if (!fn)
 118                 return;
 119
 120         if (__inline_call) {
 121                 char buf[1024];
 122                 char *err;
 123                 int rc;
 124
 125                 snprintf(buf, sizeof(buf), "insert into caller_info values ("
 126                          "'%s', '%s', '%s', %lu, %d, %d, %d, '%s', '%s');",
 127                          get_filename(), get_function(), fn,
 128                          (unsigned long)call, is_static(call->fn), type, param,
 129                          key, value);
 130                 rc = sqlite3_exec(mem_db, buf, NULL, 0, &err);
 131                 if (rc != SQLITE_OK) {
 132                         fprintf(stderr, "SQL error #2: %s\n", err);
 133                         fprintf(stderr, "SQL: '%s'\n", buf);
 134                 }
 135                 return;
 136         }
 137
 138         sm_msg("SQL_caller_info: insert into caller_info values ("
 139                "'%s', '%s', '%s', %%FUNC_ID%%, %d, %d, %d, '%s', '%s');",
 140                get_filename(), get_function(), fn, is_static(call->fn),
 141                type, param, key, value);
 142
 143         free_string(fn);
 144 }
 145
 146 void sql_insert_function_ptr(const char *fn, const char *struct_name)
 147 {
 148         sql_insert(function_ptr, "'%s', '%s', '%s'", get_filename(), fn,
 149                    struct_name);
 150 }
 151
 152 void sql_insert_return_values(const char *return_values)
 153 {
 154         sql_insert(return_values, "'%s', '%s', %d, '%s'", get_filename(),
 155                    get_function(), fn_static(), return_values);
 156 }
 157
 158 void sql_insert_call_implies(int type, int param, int value)
 159 {
 160         sql_insert(call_implies, "'%s', '%s', %d, %d, %d, %d", get_filename(),
 161                    get_function(), fn_static(), type, param, value);
 162 }
 163
 164 void sql_insert_type_size(const char *member, int size)
 165 {
 166         sql_insert(type_size, "'%s', '%s', %d", get_filename(), member, size);
 167 }
 168
 169 static char *get_static_filter(struct symbol *sym)
 170 {
 171         static char sql_filter[1024];
 172
 173         if (sym->ctype.modifiers & MOD_STATIC) {
 174                 snprintf(sql_filter, sizeof(sql_filter),
 175                          "file = '%s' and function = '%s' and static = '1';",
 176                          get_filename(), sym->ident->name);
 177         } else {
 178                 snprintf(sql_filter, sizeof(sql_filter),
 179                          "function = '%s' and static = '0';", sym->ident->name);
 180         }
 181
 182         return sql_filter;
 183 }
 184
 185 void sql_select_return_states(const char *cols, struct expression *call,
 186         int (*callback)(void*, int, char**, char**))
 187 {
 188         if (call->fn->type != EXPR_SYMBOL || !call->fn->symbol)
 189                 return;
 190
 191         run_sql(callback, "select %s from return_states where %s",
 192                 cols, get_static_filter(call->fn->symbol));
 193 }
 194
 195 void sql_select_return_values(const char *cols, struct expression *call,
 196         int (*callback)(void*, int, char**, char**))
 197 {
 198         if (call->fn->type != EXPR_SYMBOL || !call->fn->symbol)
 199                 return;
 200
 201         run_sql(callback, "select %s from return_values where %s",
 202                 cols, get_static_filter(call->fn->symbol));
 203 }
 204
 205 void sql_select_caller_info(const char *cols, struct symbol *sym,
 206         int (*callback)(void*, int, char**, char**))
 207 {
 208         run_sql(callback,
 209                 "select %s from caller_info where %s order by function_id;",
 210                 cols, get_static_filter(sym));
 211 }
 212
 213 void add_definition_db_callback(void (*callback)(const char *name, struct symbol *sym, char *key, char *value), int type)
 214 {
 215         struct def_callback *def_callback = __alloc_def_callback(0);
 216
 217         def_callback->hook_type = type;
 218         def_callback->callback = callback;
 219         add_ptr_list(&callbacks, def_callback);
 220 }
 221
 222 /*
 223  * These call backs are used when the --info option is turned on to print struct
 224  * member information.  For example foo->bar could have a state in
 225  * smatch_extra.c and also check_user.c.
 226  */
 227 void add_member_info_callback(int owner, void (*callback)(struct expression *call, int param, char *printed_name, struct smatch_state *state))
 228 {
 229         struct member_info_callback *member_callback = __alloc_member_info_callback(0);
 230
 231         member_callback->owner = owner;
 232         member_callback->callback = callback;
 233         add_ptr_list(&member_callbacks, member_callback);
 234 }
 235
 236 void add_returned_state_callback(void (*fn)(int return_id, char *return_ranges, struct expression *returned_expr, struct state_list *slist))
 237 {
 238         struct returned_state_callback *callback = __alloc_returned_state_callback(0);
 239
 240         callback->callback = fn;
 241         add_ptr_list(&returned_state_callbacks, callback);
 242 }
 243
 244 void add_returned_member_callback(int owner, void (*callback)(int return_id, char *return_ranges, char *printed_name, struct smatch_state *state))
 245 {
 246         struct returned_member_callback *member_callback = __alloc_returned_member_callback(0);
 247
 248         member_callback->owner = owner;
 249         member_callback->callback = callback;
 250         add_ptr_list(&returned_member_callbacks, member_callback);
 251 }
 252
 253 void add_db_fn_call_callback(int type, void (*callback)(struct expression *arg, char *value))
 254 {
 255         struct call_implies_callback *cb = __alloc_call_implies_callback(0);
 256
 257         cb->type = type;
 258         cb->callback = callback;
 259         add_ptr_list(&call_implies_cb_list, cb);
 260 }
 261
 262 static struct symbol *return_type;
 263 static struct range_list *return_range_list;
 264 static int db_return_callback(void *unused, int argc, char **argv, char **azColName)
 265 {
 266         if (argc != 1)
 267                 return 0;
 268         if (option_debug)
 269                 sm_msg("return type %d", type_positive_bits(return_type));
 270         str_to_rl(return_type, argv[0], &return_range_list);
 271         return 0;
 272 }
 273
 274 struct range_list *db_return_vals(struct expression *expr)
 275 {
 276         return_type = get_type(expr);
 277         if (!return_type)
 278                 return NULL;
 279         return_range_list = NULL;
 280         sql_select_return_values("return", expr, db_return_callback);
 281         return return_range_list;
 282 }
 283
 284 static void match_call_marker(struct expression *expr)
 285 {
 286         /*
 287          * we just want to record something in the database so that if we have
 288          * two calls like:  frob(4); frob(some_unkown); then on the receiving
 289          * side we know that sometimes frob is called with unknown parameters.
 290          */
 291
 292         sql_insert_caller_info(expr, INTERNAL, -1, "%call_marker%", "");
 293 }
 294
 295 static void print_struct_members(struct expression *call, struct expression *expr, int param, struct state_list *slist,
 296         void (*callback)(struct expression *call, int param, char *printed_name, struct smatch_state *state))
 297 {
 298         struct sm_state *sm;
 299         char *name;
 300         struct symbol *sym;
 301         int len;
 302         char printed_name[256];
 303         int is_address = 0;
 304
 305         expr = strip_expr(expr);
 306         if (expr->type == EXPR_PREOP && expr->op == '&') {
 307                 expr = strip_expr(expr->unop);
 308                 is_address = 1;
 309         }
 310
 311         name = expr_to_var_sym(expr, &sym);
 312         if (!name || !sym)
 313                 goto free;
 314
 315         len = strlen(name);
 316         FOR_EACH_PTR(slist, sm) {
 317                 if (sm->sym != sym)
 318                         continue;
 319                 if (strncmp(name, sm->name, len) || sm->name[len] == '\0')
 320                         continue;
 321                 if (is_address)
 322                         snprintf(printed_name, sizeof(printed_name), "$$->%s", sm->name + len + 1);
 323                 else
 324                         snprintf(printed_name, sizeof(printed_name), "$$%s", sm->name + len);
 325                 callback(call, param, printed_name, sm->state);
 326         } END_FOR_EACH_PTR(sm);
 327 free:
 328         free_string(name);
 329 }
 330
 331 static void match_call_info(struct expression *call)
 332 {
 333         struct member_info_callback *cb;
 334         struct expression *arg;
 335         struct state_list *slist;
 336         char *name;
 337         int i;
 338
 339         name = get_fnptr_name(call->fn);
 340         if (!name)
 341                 return;
 342
 343         FOR_EACH_PTR(member_callbacks, cb) {
 344                 slist = get_all_states(cb->owner);
 345                 i = 0;
 346                 FOR_EACH_PTR(call->args, arg) {
 347                         print_struct_members(call, arg, i, slist, cb->callback);
 348                         i++;
 349                 } END_FOR_EACH_PTR(arg);
 350                 free_slist(&slist);
 351         } END_FOR_EACH_PTR(cb);
 352
 353         free_string(name);
 354 }
 355
 356 static int get_param(int param, char **name, struct symbol **sym)
 357 {
 358         struct symbol *arg;
 359         int i;
 360
 361         i = 0;
 362         FOR_EACH_PTR(cur_func_sym->ctype.base_type->arguments, arg) {
 363                 /*
 364                  * this is a temporary hack to work around a bug (I think in sparse?)
 365                  * 2.6.37-rc1:fs/reiserfs/journal.o
 366                  * If there is a function definition without parameter name found
 367                  * after a function implementation then it causes a crash.
 368                  * int foo() {}
 369                  * int bar(char *);
 370                  */
 371                 if (arg->ident->name < (char *)100)
 372                         continue;
 373                 if (i == param && arg->ident->name) {
 374                         *name = arg->ident->name;
 375                         *sym = arg;
 376                         return TRUE;
 377                 }
 378                 i++;
 379         } END_FOR_EACH_PTR(arg);
 380
 381         return FALSE;
 382 }
 383
 384 static struct state_list *final_states;
 385 static int prev_func_id = -1;
 386 static int db_callback(void *unused, int argc, char **argv, char **azColName)
 387 {
 388         int func_id;
 389         long type;
 390         long param;
 391         char *name = NULL;
 392         struct symbol *sym = NULL;
 393         struct def_callback *def_callback;
 394
 395         if (argc != 5)
 396                 return 0;
 397
 398         func_id = atoi(argv[0]);
 399         errno = 0;
 400         type = strtol(argv[1], NULL, 10);
 401         param = strtol(argv[2], NULL, 10);
 402         if (errno)
 403                 return 0;
 404
 405         if (prev_func_id == -1)
 406                 prev_func_id = func_id;
 407         if (func_id != prev_func_id) {
 408                 merge_slist(&final_states, __pop_fake_cur_slist());
 409                 __push_fake_cur_slist();
 410                 __unnullify_path();
 411                 prev_func_id = func_id;
 412         }
 413
 414         if (type == INTERNAL)
 415                 return 0;
 416         if (param >= 0 && !get_param(param, &name, &sym))
 417                 return 0;
 418
 419         FOR_EACH_PTR(callbacks, def_callback) {
 420                 if (def_callback->hook_type == type)
 421                         def_callback->callback(name, sym, argv[3], argv[4]);
 422         } END_FOR_EACH_PTR(def_callback);
 423
 424         return 0;
 425 }
 426
 427 static void get_direct_callers(struct symbol *sym)
 428 {
 429         sql_select_caller_info("function_id, type, parameter, key, value", sym,
 430                         db_callback);
 431 }
 432
 433 static char *ptr_name;
 434 static int ptr_cnt;
 435 static int get_ptr_name(void *unused, int argc, char **argv, char **azColName)
 436 {
 437         if (ptr_cnt++) {
 438                 free_string(ptr_name);
 439                 ptr_name = NULL;
 440                 return 0;
 441         }
 442         if (!ptr_name)
 443                 ptr_name = alloc_string(argv[0]);
 444         return 0;
 445 }
 446
 447 static void get_function_pointer_callers(struct symbol *sym)
 448 {
 449         char sql_filter[1024];
 450
 451         if (sym->ctype.modifiers & MOD_STATIC) {
 452                 snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
 453                          get_filename(), sym->ident->name);
 454         } else {
 455                 snprintf(sql_filter, 1024, "function = '%s';",
 456                          sym->ident->name);
 457         }
 458
 459         ptr_name = NULL;
 460         ptr_cnt = 0;
 461         run_sql(get_ptr_name, "select ptr from function_ptr where %s", sql_filter);
 462         if (!ptr_name)
 463                 return;
 464
 465         run_sql(db_callback, "select function_id, type, parameter, key, value from caller_info"
 466                 " where function = '%s' order by function_id", ptr_name);
 467
 468         free_string(ptr_name);
 469 }
 470
 471 static void match_data_from_db(struct symbol *sym)
 472 {
 473         struct sm_state *sm;
 474
 475         if (!sym || !sym->ident || !sym->ident->name)
 476                 return;
 477
 478         __push_fake_cur_slist();
 479         __unnullify_path();
 480         prev_func_id = -1;
 481
 482         get_direct_callers(sym);
 483         get_function_pointer_callers(sym);
 484
 485         merge_slist(&final_states, __pop_fake_cur_slist());
 486
 487         FOR_EACH_PTR(final_states, sm) {
 488                 __set_sm(sm);
 489         } END_FOR_EACH_PTR(sm);
 490
 491         free_slist(&final_states);
 492 }
 493
 494 static void match_function_assign(struct expression *expr)
 495 {
 496         struct expression *right = expr->right;
 497         struct symbol *sym;
 498         char *fn_name;
 499         char *ptr_name;
 500
 501         if (right->type == EXPR_PREOP && right->op == '&')
 502                 right = strip_expr(right->unop);
 503         if (right->type != EXPR_SYMBOL)
 504                 return;
 505         sym = get_type(right);
 506         if (!sym || sym->type != SYM_FN)
 507                 return;
 508
 509         fn_name = expr_to_var(right);
 510         ptr_name = get_fnptr_name(expr->left);
 511         if (!fn_name || !ptr_name)
 512                 goto free;
 513
 514         sql_insert_function_ptr(fn_name, ptr_name);
 515
 516 free:
 517         free_string(fn_name);
 518         free_string(ptr_name);
 519 }
 520
 521 static struct expression *call_implies_call_expr;
 522 static int call_implies_callbacks(void *unused, int argc, char **argv, char **azColName)
 523 {
 524         struct call_implies_callback *cb;
 525         struct expression *arg = NULL;
 526         int type;
 527         int param;
 528
 529         if (argc != 4)
 530                 return 0;
 531
 532         type = atoi(argv[1]);
 533         param = atoi(argv[2]);
 534
 535         FOR_EACH_PTR(call_implies_cb_list, cb) {
 536                 if (cb->type != type)
 537                         continue;
 538                 if (param != -1) {
 539                         arg = get_argument_from_call_expr(call_implies_call_expr->args, param);
 540                         if (!arg)
 541                                 continue;
 542                 }
 543                 cb->callback(arg, argv[3]);
 544         } END_FOR_EACH_PTR(cb);
 545
 546         return 0;
 547 }
 548
 549 static void match_call_implies(struct expression *expr)
 550 {
 551         struct symbol *sym;
 552         static char sql_filter[1024];
 553
 554         if (expr->fn->type != EXPR_SYMBOL)
 555                 return;
 556         sym = expr->fn->symbol;
 557         if (!sym)
 558                 return;
 559
 560         if (sym->ctype.modifiers & MOD_STATIC) {
 561                 snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
 562                          get_filename(), sym->ident->name);
 563         } else {
 564                 snprintf(sql_filter, 1024, "function = '%s' and static = 0;",
 565                                 sym->ident->name);
 566         }
 567
 568         call_implies_call_expr = expr;
 569         run_sql(call_implies_callbacks,
 570                 "select function, type, parameter, value from call_implies where %s",
 571                 sql_filter);
 572         return;
 573 }
 574
 575 static void print_initializer_list(struct expression_list *expr_list,
 576                 struct symbol *struct_type)
 577 {
 578         struct expression *expr;
 579         struct symbol *base_type;
 580         char struct_name[256];
 581
 582         FOR_EACH_PTR(expr_list, expr) {
 583                 if (expr->type == EXPR_INDEX && expr->idx_expression && expr->idx_expression->type == EXPR_INITIALIZER) {
 584                         print_initializer_list(expr->idx_expression->expr_list, struct_type);
 585                         continue;
 586                 }
 587                 if (expr->type != EXPR_IDENTIFIER)
 588                         continue;
 589                 if (!expr->expr_ident)
 590                         continue;
 591                 if (!expr->ident_expression || !expr->ident_expression->symbol_name)
 592                         continue;
 593                 base_type = get_type(expr->ident_expression);
 594                 if (!base_type || base_type->type != SYM_FN)
 595                         continue;
 596                 snprintf(struct_name, sizeof(struct_name), "(struct %s)->%s",
 597                          struct_type->ident->name, expr->expr_ident->name);
 598                 sql_insert_function_ptr(expr->ident_expression->symbol_name->name,
 599                                         struct_name);
 600         } END_FOR_EACH_PTR(expr);
 601 }
 602
 603 static void global_variable(struct symbol *sym)
 604 {
 605         struct symbol *struct_type;
 606
 607         if (!sym->ident)
 608                 return;
 609         if (!sym->initializer || sym->initializer->type != EXPR_INITIALIZER)
 610                 return;
 611         struct_type = get_base_type(sym);
 612         if (!struct_type)
 613                 return;
 614         if (struct_type->type == SYM_ARRAY) {
 615                 struct_type = get_base_type(struct_type);
 616                 if (!struct_type)
 617                         return;
 618         }
 619         if (struct_type->type != SYM_STRUCT || !struct_type->ident)
 620                 return;
 621         print_initializer_list(sym->initializer->expr_list, struct_type);
 622 }
 623
 624 static void match_return_info(int return_id, char *return_ranges, struct expression *expr, struct state_list *slist)
 625 {
 626         sql_insert_return_states(return_id, return_ranges, INTERNAL, -1, "", "");
 627 }
 628
 629 static int return_id;
 630 static void match_function_def(struct symbol *sym)
 631 {
 632         return_id = 0;
 633 }
 634
 635 static void call_return_state_hooks_compare(struct expression *expr)
 636 {
 637         struct returned_state_callback *cb;
 638         struct state_list *slist;
 639         char *return_ranges;
 640         int final_pass_orig = final_pass;
 641
 642         __push_fake_cur_slist();
 643
 644         final_pass = 0;
 645         __split_whole_condition(expr);
 646         final_pass = final_pass_orig;
 647
 648         return_ranges = alloc_sname("1");
 649
 650         return_id++;
 651         slist = __get_cur_slist();
 652         FOR_EACH_PTR(returned_state_callbacks, cb) {
 653                 cb->callback(return_id, return_ranges, expr, slist);
 654         } END_FOR_EACH_PTR(cb);
 655
 656         __push_true_states();
 657         __use_false_states();
 658
 659         return_ranges = alloc_sname("0");;
 660         return_id++;
 661         slist = __get_cur_slist();
 662         FOR_EACH_PTR(returned_state_callbacks, cb) {
 663                 cb->callback(return_id, return_ranges, expr, slist);
 664         } END_FOR_EACH_PTR(cb);
 665
 666         __merge_true_states();
 667         __pop_fake_cur_slist();
 668 }
 669
 670 static int call_return_state_hooks_split_possible(struct expression *expr)
 671 {
 672         struct returned_state_callback *cb;
 673         struct state_list *slist;
 674         struct range_list *rl;
 675         char *return_ranges;
 676         struct sm_state *sm;
 677         struct sm_state *tmp;
 678         int ret = 0;
 679         int nr_possible, nr_states;
 680
 681         sm = get_sm_state_expr(SMATCH_EXTRA, expr);
 682         if (!sm || !sm->merged)
 683                 return 0;
 684
 685         /* bail if it gets too complicated */
 686         nr_possible = ptr_list_size((struct ptr_list *)sm->possible);
 687         nr_states = ptr_list_size((struct ptr_list *)__get_cur_slist());
 688         if (nr_possible >= 100)
 689                 return 0;
 690         if (nr_states * nr_possible >= 1000)
 691                 return 0;
 692
 693         FOR_EACH_PTR(sm->possible, tmp) {
 694                 if (tmp->merged)
 695                         continue;
 696
 697                 ret = 1;
 698                 __push_fake_cur_slist();
 699
 700                 overwrite_states_using_pool(tmp);
 701
 702                 rl = cast_rl(cur_func_return_type(), estate_rl(tmp->state));
 703                 return_ranges = show_rl(rl);
 704
 705                 return_id++;
 706                 slist = __get_cur_slist();
 707                 FOR_EACH_PTR(returned_state_callbacks, cb) {
 708                         cb->callback(return_id, return_ranges, expr, slist);
 709                 } END_FOR_EACH_PTR(cb);
 710
 711                 __pop_fake_cur_slist();
 712         } END_FOR_EACH_PTR(tmp);
 713
 714         return ret;
 715 }
 716
 717 static void call_return_state_hooks(struct expression *expr)
 718 {
 719         struct returned_state_callback *cb;
 720         struct state_list *slist;
 721         struct range_list *rl;
 722         char *return_ranges;
 723         int nr_states;
 724
 725         expr = strip_expr(expr);
 726
 727         if (!expr) {
 728                 return_ranges = alloc_sname("");
 729         } else if (is_condition(expr)) {
 730                 call_return_state_hooks_compare(expr);
 731                 return;
 732         } else if (call_return_state_hooks_split_possible(expr)) {
 733                 return;
 734         } else if (get_implied_rl(expr, &rl)) {
 735                 rl = cast_rl(cur_func_return_type(), rl);
 736                 return_ranges = show_rl(rl);
 737         } else {
 738                 rl = alloc_whole_rl(cur_func_return_type());
 739                 return_ranges = show_rl(rl);
 740         }
 741
 742         return_id++;
 743         slist = __get_cur_slist();
 744         nr_states = ptr_list_size((struct ptr_list *)__get_cur_slist());
 745         FOR_EACH_PTR(returned_state_callbacks, cb) {
 746                 if (nr_states < 10000)
 747                         cb->callback(return_id, return_ranges, expr, slist);
 748                 else
 749                         cb->callback(return_id, return_ranges, expr, NULL);
 750         } END_FOR_EACH_PTR(cb);
 751 }
 752
 753 static void print_returned_struct_members(int return_id, char *return_ranges, struct expression *expr, struct state_list *slist)
 754 {
 755         struct returned_member_callback *cb;
 756         struct state_list *my_slist;
 757         struct sm_state *sm;
 758         struct symbol *type;
 759         char *name;
 760         char member_name[256];
 761         int len;
 762
 763         type = get_type(expr);
 764         if (!type || type->type != SYM_PTR)
 765                 return;
 766         type = get_real_base_type(type);
 767         if (!type || type->type != SYM_STRUCT)
 768                 return;
 769         name = expr_to_var(expr);
 770         if (!name)
 771                 return;
 772
 773         member_name[sizeof(member_name) - 1] = '\0';
 774         strcpy(member_name, "$$");
 775
 776         len = strlen(name);
 777         FOR_EACH_PTR(returned_member_callbacks, cb) {
 778                 my_slist = get_all_states_slist(cb->owner, slist);
 779                 FOR_EACH_PTR(my_slist, sm) {
 780                         if (strncmp(sm->name, name, len) != 0)
 781                                 continue;
 782                         if (strncmp(sm->name + len, "->", 2) != 0)
 783                                 continue;
 784                         strncpy(member_name + 2, sm->name + len, sizeof(member_name) - 2);
 785                         cb->callback(return_id, return_ranges, member_name, sm->state);
 786                 } END_FOR_EACH_PTR(sm);
 787                 free_slist(&my_slist);
 788         } END_FOR_EACH_PTR(cb);
 789
 790         free_string(name);
 791 }
 792
 793 static void match_end_func_info(struct symbol *sym)
 794 {
 795         if (__path_is_null())
 796                 return;
 797         call_return_state_hooks(NULL);
 798 }
 799
 800 static void init_memdb(void)
 801 {
 802         char *err = NULL;
 803         int rc;
 804         const char *schema_files[] = {
 805                 "db/db.schema",
 806                 "db/caller_info.schema",
 807                 "db/return_states.schema",
 808                 "db/type_size.schema",
 809                 "db/call_implies.schema",
 810                 "db/function_ptr.schema",
 811                 "db/return_values.schema",
 812         };
 813         static char buf[4096];
 814         int fd;
 815         int ret;
 816         int i;
 817
 818         rc = sqlite3_open(":memory:", &mem_db);
 819         if (rc != SQLITE_OK) {
 820                 printf("Error starting In-Memory database.");
 821                 return;
 822         }
 823
 824         for (i = 0; i < ARRAY_SIZE(schema_files); i++) {
 825                 fd = open_data_file(schema_files[i]);
 826                 if (fd < 0)
 827                         continue;
 828                 ret = read(fd, buf, sizeof(buf));
 829                 if (ret == sizeof(buf)) {
 830                         printf("Schema file too large:  %s (limit %ld bytes)",
 831                                schema_files[i], sizeof(buf));
 832                 }
 833                 buf[ret] = '\0';
 834                 rc = sqlite3_exec(mem_db, buf, NULL, 0, &err);
 835                 if (rc != SQLITE_OK) {
 836                         fprintf(stderr, "SQL error #2: %s\n", err);
 837                         fprintf(stderr, "%s\n", buf);
 838                 }
 839         }
 840 }
 841
 842 void open_smatch_db(void)
 843 {
 844         int rc;
 845
 846         if (option_no_db)
 847                 return;
 848
 849         init_memdb();
 850
 851         rc = sqlite3_open_v2("smatch_db.sqlite", &db, SQLITE_OPEN_READONLY, NULL);
 852         if (rc != SQLITE_OK) {
 853                 option_no_db = 1;
 854                 return;
 855         }
 856         return;
 857 }
 858
 859 void register_definition_db_callbacks(int id)
 860 {
 861         add_hook(&match_function_def, FUNC_DEF_HOOK);
 862
 863         add_hook(&match_call_info, FUNCTION_CALL_HOOK);
 864         add_hook(&match_function_assign, ASSIGNMENT_HOOK);
 865         add_hook(&match_function_assign, GLOBAL_ASSIGNMENT_HOOK);
 866         add_hook(&global_variable, BASE_HOOK);
 867         add_hook(&global_variable, DECLARATION_HOOK);
 868         add_returned_state_callback(match_return_info);
 869         add_returned_state_callback(print_returned_struct_members);
 870         add_hook(&call_return_state_hooks, RETURN_HOOK);
 871         add_hook(&match_end_func_info, END_FUNC_HOOK);
 872
 873         if (option_no_db)
 874                 return;
 875
 876         add_hook(&match_data_from_db, FUNC_DEF_HOOK);
 877         add_hook(&match_call_implies, FUNCTION_CALL_HOOK);
 878 }
 879
 880 void register_db_call_marker(int id)
 881 {
 882         add_hook(&match_call_marker, FUNCTION_CALL_HOOK);
 883 }
 884
 885 char *get_variable_from_key(struct expression *arg, char *key, struct symbol **sym)
 886 {
 887         char buf[256];
 888         char *tmp;
 889
 890         if (strcmp(key, "$$") == 0)
 891                 return expr_to_var_sym(arg, sym);
 892
 893         if (strcmp(key, "*$$") == 0) {
 894                 if (arg->type == EXPR_PREOP && arg->op == '&') {
 895                         arg = strip_expr(arg->unop);
 896                         return expr_to_var_sym(arg, sym);
 897                 } else {
 898                         tmp = expr_to_var_sym(arg, sym);
 899                         if (!tmp)
 900                                 return NULL;
 901                         snprintf(buf, sizeof(buf), "*%s", tmp);
 902                         free_string(tmp);
 903                         return alloc_string(buf);
 904                 }
 905         }
 906
 907         if (arg->type == EXPR_PREOP && arg->op == '&') {
 908                 arg = strip_expr(arg->unop);
 909                 tmp = expr_to_var_sym(arg, sym);
 910                 if (!tmp)
 911                         return NULL;
 912                 snprintf(buf, sizeof(buf), "%s.%s", tmp, key + 4);
 913                 return alloc_string(buf);
 914         }
 915
 916         tmp = expr_to_var_sym(arg, sym);
 917         if (!tmp)
 918                 return NULL;
 919         snprintf(buf, sizeof(buf), "%s%s", tmp, key + 2);
 920         free_string(tmp);
 921         return alloc_string(buf);
 922 }
 923
 924