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                 sm_debug("in-mem: %s\n", buf);                                  \
  33                 rc = sqlite3_exec(mem_db, buf, NULL, 0, &err);                  \
  34                 if (rc != SQLITE_OK) {                                          \
  35                         fprintf(stderr, "SQL error #2: %s\n", err);             \
  36                         fprintf(stderr, "SQL: '%s'\n", buf);                    \
  37                 }                                                               \
  38                 return;                                                         \
  39         }                                                                       \
  40         if (option_info) {                                                      \
  41                 sm_prefix();                                                    \
  42                 sm_printf("SQL: insert into " #table " values (" values);       \
  43                 sm_printf(");\n");                                              \
  44         }                                                                       \
  45 } while (0)
  46
  47 struct def_callback {
  48         int hook_type;
  49         void (*callback)(const char *name, struct symbol *sym, char *key, char *value);
  50 };
  51 ALLOCATOR(def_callback, "definition db hook callbacks");
  52 DECLARE_PTR_LIST(callback_list, struct def_callback);
  53 static struct callback_list *callbacks;
  54
  55 struct member_info_callback {
  56         int owner;
  57         void (*callback)(struct expression *call, int param, char *printed_name, struct smatch_state *state);
  58 };
  59 ALLOCATOR(member_info_callback, "caller_info callbacks");
  60 DECLARE_PTR_LIST(member_info_cb_list, struct member_info_callback);
  61 static struct member_info_cb_list *member_callbacks;
  62
  63 struct returned_state_callback {
  64         void (*callback)(int return_id, char *return_ranges, struct expression *return_expr);
  65 };
  66 ALLOCATOR(returned_state_callback, "returned state callbacks");
  67 DECLARE_PTR_LIST(returned_state_cb_list, struct returned_state_callback);
  68 static struct returned_state_cb_list *returned_state_callbacks;
  69
  70 struct returned_member_callback {
  71         int owner;
  72         void (*callback)(int return_id, char *return_ranges, char *printed_name, struct smatch_state *state);
  73 };
  74 ALLOCATOR(returned_member_callback, "returned member callbacks");
  75 DECLARE_PTR_LIST(returned_member_cb_list, struct returned_member_callback);
  76 static struct returned_member_cb_list *returned_member_callbacks;
  77
  78 struct call_implies_callback {
  79         int type;
  80         void (*callback)(struct expression *arg, char *value);
  81 };
  82 ALLOCATOR(call_implies_callback, "call_implies callbacks");
  83 DECLARE_PTR_LIST(call_implies_cb_list, struct call_implies_callback);
  84 static struct call_implies_cb_list *call_implies_cb_list;
  85
  86 void sql_exec(int (*callback)(void*, int, char**, char**), const char *sql)
  87 {
  88         char *err = NULL;
  89         int rc;
  90
  91         if (option_no_db || !db)
  92                 return;
  93
  94         rc = sqlite3_exec(db, sql, callback, 0, &err);
  95         if (rc != SQLITE_OK) {
  96                 fprintf(stderr, "SQL error #2: %s\n", err);
  97                 fprintf(stderr, "SQL: '%s'\n", sql);
  98         }
  99 }
 100
 101 void sql_mem_exec(int (*callback)(void*, int, char**, char**), const char *sql)
 102 {
 103         char *err = NULL;
 104         int rc;
 105
 106         rc = sqlite3_exec(mem_db, sql, callback, 0, &err);
 107         if (rc != SQLITE_OK) {
 108                 fprintf(stderr, "SQL error #2: %s\n", err);
 109                 fprintf(stderr, "SQL: '%s'\n", sql);
 110         }
 111 }
 112
 113 void sql_insert_return_states(int return_id, const char *return_ranges,
 114                 int type, int param, const char *key, const char *value)
 115 {
 116         if (key && strlen(key) >= 80)
 117                 return;
 118         sql_insert(return_states, "'%s', '%s', %lu, %d, '%s', %d, %d, %d, '%s', '%s'",
 119                    get_base_file(), get_function(), (unsigned long)__inline_fn,
 120                    return_id, return_ranges, fn_static(), type, param, key, value);
 121 }
 122
 123 static struct string_list *common_funcs;
 124 static int is_common_function(const char *fn)
 125 {
 126         char *tmp;
 127
 128         if (strncmp(fn, "__builtin_", 10) == 0)
 129                 return 1;
 130
 131         FOR_EACH_PTR(common_funcs, tmp) {
 132                 if (strcmp(tmp, fn) == 0)
 133                         return 1;
 134         } END_FOR_EACH_PTR(tmp);
 135
 136         return 0;
 137 }
 138
 139 void sql_insert_caller_info(struct expression *call, int type,
 140                 int param, const char *key, const char *value)
 141 {
 142         char *fn;
 143
 144         if (!option_info && !__inline_call)
 145                 return;
 146
 147         if (key && strlen(key) >= 80)
 148                 return;
 149
 150         fn = get_fnptr_name(call->fn);
 151         if (!fn)
 152                 return;
 153
 154         if (__inline_call) {
 155                 mem_sql(NULL,
 156                         "insert into caller_info values ('%s', '%s', '%s', %lu, %d, %d, %d, '%s', '%s');",
 157                         get_base_file(), get_function(), fn, (unsigned long)call,
 158                         is_static(call->fn), type, param, key, value);
 159         }
 160
 161         if (!option_info)
 162                 return;
 163
 164         if (is_common_function(fn))
 165                 return;
 166
 167         sm_msg("SQL_caller_info: insert into caller_info values ("
 168                "'%s', '%s', '%s', %%CALL_ID%%, %d, %d, %d, '%s', '%s');",
 169                get_base_file(), get_function(), fn, is_static(call->fn),
 170                type, param, key, value);
 171
 172         free_string(fn);
 173 }
 174
 175 void sql_insert_function_ptr(const char *fn, const char *struct_name)
 176 {
 177         sql_insert(function_ptr, "'%s', '%s', '%s'", get_base_file(), fn,
 178                    struct_name);
 179 }
 180
 181 void sql_insert_return_values(const char *return_values)
 182 {
 183         sql_insert(return_values, "'%s', '%s', %lu, %d, '%s'", get_base_file(),
 184                    get_function(), (unsigned long)__inline_fn, fn_static(),
 185                    return_values);
 186 }
 187
 188 void sql_insert_call_implies(int type, int param, int value)
 189 {
 190         sql_insert(call_implies, "'%s', '%s', %lu, %d, %d, %d, %d", get_base_file(),
 191                    get_function(), (unsigned long)__inline_fn, fn_static(),
 192                    type, param, value);
 193 }
 194
 195 void sql_insert_type_size(const char *member, int size)
 196 {
 197         sql_insert(type_size, "'%s', '%s', %d", get_base_file(), member, size);
 198 }
 199
 200 void sql_insert_local_values(const char *name, const char *value)
 201 {
 202         sql_insert(local_values, "'%s', '%s', '%s'", get_base_file(), name, value);
 203 }
 204
 205 static char *get_static_filter(struct symbol *sym)
 206 {
 207         static char sql_filter[1024];
 208
 209         if (sym->ctype.modifiers & MOD_STATIC) {
 210                 snprintf(sql_filter, sizeof(sql_filter),
 211                          "file = '%s' and function = '%s' and static = '1'",
 212                          get_base_file(), sym->ident->name);
 213         } else {
 214                 snprintf(sql_filter, sizeof(sql_filter),
 215                          "function = '%s' and static = '0'", sym->ident->name);
 216         }
 217
 218         return sql_filter;
 219 }
 220
 221 static int row_count;
 222 static int get_row_count(void *unused, int argc, char **argv, char **azColName)
 223 {
 224         if (argc != 1)
 225                 return 0;
 226         row_count = atoi(argv[0]);
 227         return 0;
 228 }
 229
 230 void sql_select_return_states(const char *cols, struct expression *call,
 231         int (*callback)(void*, int, char**, char**))
 232 {
 233         if (call->fn->type != EXPR_SYMBOL || !call->fn->symbol)
 234                 return;
 235
 236         if (inlinable(call->fn)) {
 237                 mem_sql(callback,
 238                         "select %s from return_states where call_id = '%lu';",
 239                         cols, (unsigned long)call);
 240                 return;
 241         }
 242
 243         row_count = 0;
 244         run_sql(get_row_count, "select count(*) from return_states where %s;",
 245                 get_static_filter(call->fn->symbol));
 246         if (row_count > 1000)
 247                 return;
 248
 249         run_sql(callback, "select %s from return_states where %s;",
 250                 cols, get_static_filter(call->fn->symbol));
 251 }
 252
 253 void sql_select_call_implies(const char *cols, struct expression *call,
 254         int (*callback)(void*, int, char**, char**))
 255 {
 256         if (call->fn->type != EXPR_SYMBOL || !call->fn->symbol)
 257                 return;
 258
 259         if (inlinable(call->fn)) {
 260                 mem_sql(callback,
 261                         "select %s from call_implies where call_id = '%lu';",
 262                         cols, (unsigned long)call);
 263                 return;
 264         }
 265
 266         run_sql(callback, "select %s from call_implies where %s;",
 267                 cols, get_static_filter(call->fn->symbol));
 268 }
 269
 270 void sql_select_caller_info(const char *cols, struct symbol *sym,
 271         int (*callback)(void*, int, char**, char**))
 272 {
 273         if (__inline_fn) {
 274                 mem_sql(callback, "select %s from caller_info where call_id = %lu;",
 275                         cols, (unsigned long)__inline_fn);
 276                 return;
 277         }
 278
 279         run_sql(callback,
 280                 "select %s from caller_info where %s order by call_id;",
 281                 cols, get_static_filter(sym));
 282 }
 283
 284 void add_definition_db_callback(void (*callback)(const char *name, struct symbol *sym, char *key, char *value), int type)
 285 {
 286         struct def_callback *def_callback = __alloc_def_callback(0);
 287
 288         def_callback->hook_type = type;
 289         def_callback->callback = callback;
 290         add_ptr_list(&callbacks, def_callback);
 291 }
 292
 293 /*
 294  * These call backs are used when the --info option is turned on to print struct
 295  * member information.  For example foo->bar could have a state in
 296  * smatch_extra.c and also check_user.c.
 297  */
 298 void add_member_info_callback(int owner, void (*callback)(struct expression *call, int param, char *printed_name, struct smatch_state *state))
 299 {
 300         struct member_info_callback *member_callback = __alloc_member_info_callback(0);
 301
 302         member_callback->owner = owner;
 303         member_callback->callback = callback;
 304         add_ptr_list(&member_callbacks, member_callback);
 305 }
 306
 307 void add_returned_state_callback(void (*fn)(int return_id, char *return_ranges, struct expression *returned_expr))
 308 {
 309         struct returned_state_callback *callback = __alloc_returned_state_callback(0);
 310
 311         callback->callback = fn;
 312         add_ptr_list(&returned_state_callbacks, callback);
 313 }
 314
 315 void add_returned_member_callback(int owner, void (*callback)(int return_id, char *return_ranges, char *printed_name, struct smatch_state *state))
 316 {
 317         struct returned_member_callback *member_callback = __alloc_returned_member_callback(0);
 318
 319         member_callback->owner = owner;
 320         member_callback->callback = callback;
 321         add_ptr_list(&returned_member_callbacks, member_callback);
 322 }
 323
 324 void add_db_fn_call_callback(int type, void (*callback)(struct expression *arg, char *value))
 325 {
 326         struct call_implies_callback *cb = __alloc_call_implies_callback(0);
 327
 328         cb->type = type;
 329         cb->callback = callback;
 330         add_ptr_list(&call_implies_cb_list, cb);
 331 }
 332
 333 static struct symbol *return_type;
 334 static struct range_list *return_range_list;
 335 static int db_return_callback(void *unused, int argc, char **argv, char **azColName)
 336 {
 337         struct range_list *rl;
 338
 339         if (argc != 1)
 340                 return 0;
 341         str_to_rl(return_type, argv[0], &rl);
 342         return_range_list = rl_union(return_range_list, rl);
 343         return 0;
 344 }
 345
 346 struct range_list *db_return_vals(struct expression *expr)
 347 {
 348         return_type = get_type(expr);
 349         if (!return_type)
 350                 return NULL;
 351         if (expr->fn->type != EXPR_SYMBOL || !expr->fn->symbol)
 352                 return NULL;
 353
 354         return_range_list = NULL;
 355         if (inlinable(expr->fn)) {
 356                 mem_sql(db_return_callback,
 357                         "select distinct return from return_states where call_id = '%lu';",
 358                         (unsigned long)expr);
 359         } else {
 360                 run_sql(db_return_callback,
 361                         "select distinct return from return_states where %s;",
 362                         get_static_filter(expr->fn->symbol));
 363         }
 364         return return_range_list;
 365 }
 366
 367 static void match_call_marker(struct expression *expr)
 368 {
 369         /*
 370          * we just want to record something in the database so that if we have
 371          * two calls like:  frob(4); frob(some_unkown); then on the receiving
 372          * side we know that sometimes frob is called with unknown parameters.
 373          */
 374
 375         sql_insert_caller_info(expr, INTERNAL, -1, "%call_marker%", "");
 376 }
 377
 378 static void print_struct_members(struct expression *call, struct expression *expr, int param, struct state_list *slist,
 379         void (*callback)(struct expression *call, int param, char *printed_name, struct smatch_state *state))
 380 {
 381         struct sm_state *sm;
 382         char *name;
 383         struct symbol *sym;
 384         int len;
 385         char printed_name[256];
 386         int is_address = 0;
 387
 388         expr = strip_expr(expr);
 389         if (expr->type == EXPR_PREOP && expr->op == '&') {
 390                 expr = strip_expr(expr->unop);
 391                 is_address = 1;
 392         }
 393
 394         name = expr_to_var_sym(expr, &sym);
 395         if (!name || !sym)
 396                 goto free;
 397
 398         len = strlen(name);
 399         FOR_EACH_PTR(slist, sm) {
 400                 if (sm->sym != sym)
 401                         continue;
 402                 if (strcmp(name, sm->name) == 0) {
 403                         if (is_address)
 404                                 snprintf(printed_name, sizeof(printed_name), "*$$");
 405                         else /* these are already handled. fixme: handle them here */
 406                                 continue;
 407                 } else if (sm->name[0] == '*' && strcmp(name, sm->name + 1) == 0) {
 408                         snprintf(printed_name, sizeof(printed_name), "*$$");
 409                 } else if (strncmp(name, sm->name, len) == 0) {
 410                         if (is_address)
 411                                 snprintf(printed_name, sizeof(printed_name), "$$->%s", sm->name + len + 1);
 412                         else
 413                                 snprintf(printed_name, sizeof(printed_name), "$$%s", sm->name + len);
 414                 } else {
 415                         continue;
 416                 }
 417                 callback(call, param, printed_name, sm->state);
 418         } END_FOR_EACH_PTR(sm);
 419 free:
 420         free_string(name);
 421 }
 422
 423 static void match_call_info(struct expression *call)
 424 {
 425         struct member_info_callback *cb;
 426         struct expression *arg;
 427         struct state_list *slist;
 428         char *name;
 429         int i;
 430
 431         name = get_fnptr_name(call->fn);
 432         if (!name)
 433                 return;
 434
 435         FOR_EACH_PTR(member_callbacks, cb) {
 436                 slist = get_all_states(cb->owner);
 437                 i = 0;
 438                 FOR_EACH_PTR(call->args, arg) {
 439                         print_struct_members(call, arg, i, slist, cb->callback);
 440                         i++;
 441                 } END_FOR_EACH_PTR(arg);
 442                 free_slist(&slist);
 443         } END_FOR_EACH_PTR(cb);
 444
 445         free_string(name);
 446 }
 447
 448 static int get_param(int param, char **name, struct symbol **sym)
 449 {
 450         struct symbol *arg;
 451         int i;
 452
 453         i = 0;
 454         FOR_EACH_PTR(cur_func_sym->ctype.base_type->arguments, arg) {
 455                 /*
 456                  * this is a temporary hack to work around a bug (I think in sparse?)
 457                  * 2.6.37-rc1:fs/reiserfs/journal.o
 458                  * If there is a function definition without parameter name found
 459                  * after a function implementation then it causes a crash.
 460                  * int foo() {}
 461                  * int bar(char *);
 462                  */
 463                 if (arg->ident->name < (char *)100)
 464                         continue;
 465                 if (i == param && arg->ident->name) {
 466                         *name = arg->ident->name;
 467                         *sym = arg;
 468                         return TRUE;
 469                 }
 470                 i++;
 471         } END_FOR_EACH_PTR(arg);
 472
 473         return FALSE;
 474 }
 475
 476 static struct state_list *final_states;
 477 static int prev_func_id = -1;
 478 static int db_callback(void *unused, int argc, char **argv, char **azColName)
 479 {
 480         int func_id;
 481         long type;
 482         long param;
 483         char *name = NULL;
 484         struct symbol *sym = NULL;
 485         struct def_callback *def_callback;
 486         struct state_list *slist;
 487
 488         if (argc != 5)
 489                 return 0;
 490
 491         func_id = atoi(argv[0]);
 492         errno = 0;
 493         type = strtol(argv[1], NULL, 10);
 494         param = strtol(argv[2], NULL, 10);
 495         if (errno)
 496                 return 0;
 497
 498         if (prev_func_id == -1)
 499                 prev_func_id = func_id;
 500         if (func_id != prev_func_id) {
 501                 slist = __pop_fake_cur_slist();
 502                 merge_slist(&final_states, slist);
 503                 free_slist(&slist);
 504                 __push_fake_cur_slist();
 505                 __unnullify_path();
 506                 prev_func_id = func_id;
 507         }
 508
 509         if (type == INTERNAL)
 510                 return 0;
 511         if (param >= 0 && !get_param(param, &name, &sym))
 512                 return 0;
 513
 514         FOR_EACH_PTR(callbacks, def_callback) {
 515                 if (def_callback->hook_type == type)
 516                         def_callback->callback(name, sym, argv[3], argv[4]);
 517         } END_FOR_EACH_PTR(def_callback);
 518
 519         return 0;
 520 }
 521
 522 static void get_direct_callers(struct symbol *sym)
 523 {
 524         sql_select_caller_info("call_id, type, parameter, key, value", sym,
 525                         db_callback);
 526 }
 527
 528 static struct string_list *ptr_names_done;
 529 static struct string_list *ptr_names;
 530
 531 static int get_ptr_name(void *unused, int argc, char **argv, char **azColName)
 532 {
 533         insert_string(&ptr_names, alloc_string(argv[0]));
 534         return 0;
 535 }
 536
 537 static char *get_next_ptr_name(void)
 538 {
 539         char *ptr;
 540
 541         FOR_EACH_PTR(ptr_names, ptr) {
 542                 if (list_has_string(ptr_names_done, ptr))
 543                         continue;
 544                 insert_string(&ptr_names_done, ptr);
 545                 return ptr;
 546         } END_FOR_EACH_PTR(ptr);
 547         return NULL;
 548 }
 549
 550 static void get_ptr_names(const char *file, const char *name)
 551 {
 552         char sql_filter[1024];
 553         int before, after;
 554
 555         if (file) {
 556                 snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
 557                          file, name);
 558         } else {
 559                 snprintf(sql_filter, 1024, "function = '%s';", name);
 560         }
 561
 562         before = ptr_list_size((struct ptr_list *)ptr_names);
 563
 564         run_sql(get_ptr_name,
 565                 "select distinct ptr from function_ptr where %s",
 566                 sql_filter);
 567
 568         after = ptr_list_size((struct ptr_list *)ptr_names);
 569         if (before == after)
 570                 return;
 571
 572         while ((name = get_next_ptr_name()))
 573                 get_ptr_names(NULL, name);
 574 }
 575
 576 static void get_function_pointer_callers(struct symbol *sym)
 577 {
 578         char *ptr;
 579
 580         if (sym->ctype.modifiers & MOD_STATIC)
 581                 get_ptr_names(get_base_file(), sym->ident->name);
 582         else
 583                 get_ptr_names(NULL, sym->ident->name);
 584
 585         FOR_EACH_PTR(ptr_names, ptr) {
 586                 run_sql(db_callback, "select call_id, type, parameter, key, value"
 587                         " from caller_info where function = '%s' order by call_id",
 588                         ptr);
 589                 free_string(ptr);
 590         } END_FOR_EACH_PTR(ptr);
 591
 592         __free_ptr_list((struct ptr_list **)&ptr_names);
 593         __free_ptr_list((struct ptr_list **)&ptr_names_done);
 594 }
 595
 596 static void match_data_from_db(struct symbol *sym)
 597 {
 598         struct sm_state *sm;
 599         struct state_list *slist;
 600
 601         if (!sym || !sym->ident || !sym->ident->name)
 602                 return;
 603
 604         __push_fake_cur_slist();
 605         __unnullify_path();
 606         prev_func_id = -1;
 607
 608         get_direct_callers(sym);
 609         if (!__inline_fn)
 610                 get_function_pointer_callers(sym);
 611
 612         slist = __pop_fake_cur_slist();
 613         merge_slist(&final_states, slist);
 614         free_slist(&slist);
 615
 616         FOR_EACH_PTR(final_states, sm) {
 617                 __set_sm(sm);
 618         } END_FOR_EACH_PTR(sm);
 619
 620         free_slist(&final_states);
 621 }
 622
 623 static struct expression *call_implies_call_expr;
 624 static int call_implies_callbacks(void *unused, int argc, char **argv, char **azColName)
 625 {
 626         struct call_implies_callback *cb;
 627         struct expression *arg = NULL;
 628         int type;
 629         int param;
 630
 631         if (argc != 4)
 632                 return 0;
 633
 634         type = atoi(argv[1]);
 635         param = atoi(argv[2]);
 636
 637         FOR_EACH_PTR(call_implies_cb_list, cb) {
 638                 if (cb->type != type)
 639                         continue;
 640                 if (param != -1) {
 641                         arg = get_argument_from_call_expr(call_implies_call_expr->args, param);
 642                         if (!arg)
 643                                 continue;
 644                 }
 645                 cb->callback(arg, argv[3]);
 646         } END_FOR_EACH_PTR(cb);
 647
 648         return 0;
 649 }
 650
 651 static void match_call_implies(struct expression *expr)
 652 {
 653         call_implies_call_expr = expr;
 654         sql_select_call_implies("function, type, parameter, value", expr,
 655                                 call_implies_callbacks);
 656         return;
 657 }
 658
 659 static void print_initializer_list(struct expression_list *expr_list,
 660                 struct symbol *struct_type)
 661 {
 662         struct expression *expr;
 663         struct symbol *base_type;
 664         char struct_name[256];
 665
 666         FOR_EACH_PTR(expr_list, expr) {
 667                 if (expr->type == EXPR_INDEX && expr->idx_expression && expr->idx_expression->type == EXPR_INITIALIZER) {
 668                         print_initializer_list(expr->idx_expression->expr_list, struct_type);
 669                         continue;
 670                 }
 671                 if (expr->type != EXPR_IDENTIFIER)
 672                         continue;
 673                 if (!expr->expr_ident)
 674                         continue;
 675                 if (!expr->ident_expression || !expr->ident_expression->symbol_name)
 676                         continue;
 677                 base_type = get_type(expr->ident_expression);
 678                 if (!base_type || base_type->type != SYM_FN)
 679                         continue;
 680                 snprintf(struct_name, sizeof(struct_name), "(struct %s)->%s",
 681                          struct_type->ident->name, expr->expr_ident->name);
 682                 sql_insert_function_ptr(expr->ident_expression->symbol_name->name,
 683                                         struct_name);
 684         } END_FOR_EACH_PTR(expr);
 685 }
 686
 687 static void global_variable(struct symbol *sym)
 688 {
 689         struct symbol *struct_type;
 690
 691         if (!sym->ident)
 692                 return;
 693         if (!sym->initializer || sym->initializer->type != EXPR_INITIALIZER)
 694                 return;
 695         struct_type = get_base_type(sym);
 696         if (!struct_type)
 697                 return;
 698         if (struct_type->type == SYM_ARRAY) {
 699                 struct_type = get_base_type(struct_type);
 700                 if (!struct_type)
 701                         return;
 702         }
 703         if (struct_type->type != SYM_STRUCT || !struct_type->ident)
 704                 return;
 705         print_initializer_list(sym->initializer->expr_list, struct_type);
 706 }
 707
 708 static void match_return_info(int return_id, char *return_ranges, struct expression *expr)
 709 {
 710         sql_insert_return_states(return_id, return_ranges, INTERNAL, -1, "", "");
 711 }
 712
 713 static int return_id;
 714 static void match_function_def(struct symbol *sym)
 715 {
 716         if (!__inline_fn)
 717                 return_id = 0;
 718 }
 719
 720 static void call_return_state_hooks_compare(struct expression *expr)
 721 {
 722         struct returned_state_callback *cb;
 723         char *return_ranges;
 724         int final_pass_orig = final_pass;
 725
 726         __push_fake_cur_slist();
 727
 728         final_pass = 0;
 729         __split_whole_condition(expr);
 730         final_pass = final_pass_orig;
 731
 732         return_ranges = alloc_sname("1");
 733
 734         return_id++;
 735         FOR_EACH_PTR(returned_state_callbacks, cb) {
 736                 cb->callback(return_id, return_ranges, expr);
 737         } END_FOR_EACH_PTR(cb);
 738
 739         __push_true_states();
 740         __use_false_states();
 741
 742         return_ranges = alloc_sname("0");;
 743         return_id++;
 744         FOR_EACH_PTR(returned_state_callbacks, cb) {
 745                 cb->callback(return_id, return_ranges, expr);
 746         } END_FOR_EACH_PTR(cb);
 747
 748         __merge_true_states();
 749         __free_fake_cur_slist();
 750 }
 751
 752 static int call_return_state_hooks_split_possible(struct expression *expr)
 753 {
 754         struct returned_state_callback *cb;
 755         struct range_list *rl;
 756         char *return_ranges;
 757         struct sm_state *sm;
 758         struct sm_state *tmp;
 759         int ret = 0;
 760         int nr_possible, nr_states;
 761
 762         sm = get_sm_state_expr(SMATCH_EXTRA, expr);
 763         if (!sm || !sm->merged)
 764                 return 0;
 765
 766         /* bail if it gets too complicated */
 767         nr_possible = ptr_list_size((struct ptr_list *)sm->possible);
 768         nr_states = ptr_list_size((struct ptr_list *)__get_cur_slist());
 769         /*
 770          * the main thing option_info because we don't want to print a
 771          * million lines of output.  If someone else, like check_locking.c
 772          * wants this data, then it doesn't cause a slow down to provide it.
 773          */
 774         if (option_info && nr_possible >= 100)
 775                 return 0;
 776         if (option_info && nr_states * nr_possible >= 2000)
 777                 return 0;
 778
 779         FOR_EACH_PTR(sm->possible, tmp) {
 780                 if (tmp->merged)
 781                         continue;
 782
 783                 ret = 1;
 784                 __push_fake_cur_slist();
 785
 786                 overwrite_states_using_pool(tmp);
 787
 788                 rl = cast_rl(cur_func_return_type(), estate_rl(tmp->state));
 789                 return_ranges = show_rl(rl);
 790
 791                 return_id++;
 792                 FOR_EACH_PTR(returned_state_callbacks, cb) {
 793                         cb->callback(return_id, return_ranges, expr);
 794                 } END_FOR_EACH_PTR(cb);
 795
 796                 __free_fake_cur_slist();
 797         } END_FOR_EACH_PTR(tmp);
 798
 799         return ret;
 800 }
 801
 802 static void call_return_state_hooks(struct expression *expr)
 803 {
 804         struct returned_state_callback *cb;
 805         struct range_list *rl;
 806         char *return_ranges;
 807         int nr_states;
 808
 809         expr = strip_expr(expr);
 810
 811         if (!expr) {
 812                 return_ranges = alloc_sname("");
 813         } else if (is_condition(expr)) {
 814                 call_return_state_hooks_compare(expr);
 815                 return;
 816         } else if (call_return_state_hooks_split_possible(expr)) {
 817                 return;
 818         } else if (get_implied_rl(expr, &rl) && !is_whole_rl(rl)) {
 819                 rl = cast_rl(cur_func_return_type(), rl);
 820                 return_ranges = show_rl(rl);
 821         } else {
 822                 return_ranges = range_comparison_to_param(expr);
 823                 if (!return_ranges) {
 824                         rl = cast_rl(cur_func_return_type(), alloc_whole_rl(get_type(expr)));
 825                         return_ranges = show_rl(rl);
 826                 }
 827         }
 828
 829         return_id++;
 830         nr_states = ptr_list_size((struct ptr_list *)__get_cur_slist());
 831         if (nr_states >= 10000) {
 832                 match_return_info(return_id, return_ranges, expr);
 833                 return;
 834         }
 835         FOR_EACH_PTR(returned_state_callbacks, cb) {
 836                 cb->callback(return_id, return_ranges, expr);
 837         } END_FOR_EACH_PTR(cb);
 838 }
 839
 840 static void print_returned_struct_members(int return_id, char *return_ranges, struct expression *expr)
 841 {
 842         struct returned_member_callback *cb;
 843         struct state_list *my_slist;
 844         struct sm_state *sm;
 845         struct symbol *type;
 846         char *name;
 847         char member_name[256];
 848         int len;
 849
 850         type = get_type(expr);
 851         if (!type || type->type != SYM_PTR)
 852                 return;
 853         type = get_real_base_type(type);
 854         if (!type || type->type != SYM_STRUCT)
 855                 return;
 856         name = expr_to_var(expr);
 857         if (!name)
 858                 return;
 859
 860         member_name[sizeof(member_name) - 1] = '\0';
 861         strcpy(member_name, "$$");
 862
 863         len = strlen(name);
 864         FOR_EACH_PTR(returned_member_callbacks, cb) {
 865                 my_slist = get_all_states(cb->owner);
 866                 FOR_EACH_PTR(my_slist, sm) {
 867                         if (strncmp(sm->name, name, len) != 0)
 868                                 continue;
 869                         if (strncmp(sm->name + len, "->", 2) != 0)
 870                                 continue;
 871                         strncpy(member_name + 2, sm->name + len, sizeof(member_name) - 2);
 872                         cb->callback(return_id, return_ranges, member_name, sm->state);
 873                 } END_FOR_EACH_PTR(sm);
 874                 free_slist(&my_slist);
 875         } END_FOR_EACH_PTR(cb);
 876
 877         free_string(name);
 878 }
 879
 880 static void reset_memdb(void)
 881 {
 882         mem_sql(NULL, "delete from caller_info;");
 883         mem_sql(NULL, "delete from return_states;");
 884         mem_sql(NULL, "delete from call_implies;");
 885         mem_sql(NULL, "delete from return_values;");
 886 }
 887
 888 static void match_end_func_info(struct symbol *sym)
 889 {
 890         if (__path_is_null())
 891                 return;
 892         call_return_state_hooks(NULL);
 893         if (!__inline_fn)
 894                 reset_memdb();
 895 }
 896
 897 static void init_memdb(void)
 898 {
 899         char *err = NULL;
 900         int rc;
 901         const char *schema_files[] = {
 902                 "db/db.schema",
 903                 "db/caller_info.schema",
 904                 "db/return_states.schema",
 905                 "db/type_size.schema",
 906                 "db/call_implies.schema",
 907                 "db/function_ptr.schema",
 908                 "db/return_values.schema",
 909                 "db/local_values.schema",
 910         };
 911         static char buf[4096];
 912         int fd;
 913         int ret;
 914         int i;
 915
 916         rc = sqlite3_open(":memory:", &mem_db);
 917         if (rc != SQLITE_OK) {
 918                 printf("Error starting In-Memory database.");
 919                 return;
 920         }
 921
 922         for (i = 0; i < ARRAY_SIZE(schema_files); i++) {
 923                 fd = open_data_file(schema_files[i]);
 924                 if (fd < 0)
 925                         continue;
 926                 ret = read(fd, buf, sizeof(buf));
 927                 if (ret == sizeof(buf)) {
 928                         printf("Schema file too large:  %s (limit %zd bytes)",
 929                                schema_files[i], sizeof(buf));
 930                 }
 931                 buf[ret] = '\0';
 932                 rc = sqlite3_exec(mem_db, buf, NULL, 0, &err);
 933                 if (rc != SQLITE_OK) {
 934                         fprintf(stderr, "SQL error #2: %s\n", err);
 935                         fprintf(stderr, "%s\n", buf);
 936                 }
 937         }
 938 }
 939
 940 void open_smatch_db(void)
 941 {
 942         int rc;
 943
 944         if (option_no_db)
 945                 return;
 946
 947         init_memdb();
 948
 949         rc = sqlite3_open_v2("smatch_db.sqlite", &db, SQLITE_OPEN_READONLY, NULL);
 950         if (rc != SQLITE_OK) {
 951                 option_no_db = 1;
 952                 return;
 953         }
 954         return;
 955 }
 956
 957 static void register_common_funcs(void)
 958 {
 959         struct token *token;
 960         char *func;
 961         char filename[256];
 962
 963         if (option_project == PROJ_NONE)
 964                 strcpy(filename, "common_functions");
 965         else
 966                 snprintf(filename, 256, "%s.common_functions", option_project_str);
 967
 968         token = get_tokens_file(filename);
 969         if (!token)
 970                 return;
 971         if (token_type(token) != TOKEN_STREAMBEGIN)
 972                 return;
 973         token = token->next;
 974         while (token_type(token) != TOKEN_STREAMEND) {
 975                 if (token_type(token) != TOKEN_IDENT)
 976                         return;
 977                 func = alloc_string(show_ident(token->ident));
 978                 add_ptr_list(&common_funcs, func);
 979                 token = token->next;
 980         }
 981         clear_token_alloc();
 982 }
 983
 984
 985 void register_definition_db_callbacks(int id)
 986 {
 987         add_hook(&match_function_def, FUNC_DEF_HOOK);
 988
 989         add_hook(&match_call_info, FUNCTION_CALL_HOOK);
 990         add_hook(&global_variable, BASE_HOOK);
 991         add_hook(&global_variable, DECLARATION_HOOK);
 992         add_returned_state_callback(match_return_info);
 993         add_returned_state_callback(print_returned_struct_members);
 994         add_hook(&call_return_state_hooks, RETURN_HOOK);
 995         add_hook(&match_end_func_info, END_FUNC_HOOK);
 996
 997         add_hook(&match_data_from_db, FUNC_DEF_HOOK);
 998         add_hook(&match_call_implies, CALL_HOOK_AFTER_INLINE);
 999
1000         register_common_funcs();
1001 }
1002
1003 void register_db_call_marker(int id)
1004 {
1005         add_hook(&match_call_marker, FUNCTION_CALL_HOOK);
1006 }
1007
1008 char *get_variable_from_key(struct expression *arg, char *key, struct symbol **sym)
1009 {
1010         char buf[256];
1011         char *tmp;
1012
1013         if (strcmp(key, "$$") == 0)
1014                 return expr_to_var_sym(arg, sym);
1015
1016         if (strcmp(key, "*$$") == 0) {
1017                 if (arg->type == EXPR_PREOP && arg->op == '&') {
1018                         arg = strip_expr(arg->unop);
1019                         return expr_to_var_sym(arg, sym);
1020                 } else {
1021                         tmp = expr_to_var_sym(arg, sym);
1022                         if (!tmp)
1023                                 return NULL;
1024                         snprintf(buf, sizeof(buf), "*%s", tmp);
1025                         free_string(tmp);
1026                         return alloc_string(buf);
1027                 }
1028         }
1029
1030         if (arg->type == EXPR_PREOP && arg->op == '&') {
1031                 arg = strip_expr(arg->unop);
1032                 tmp = expr_to_var_sym(arg, sym);
1033                 if (!tmp)
1034                         return NULL;
1035                 snprintf(buf, sizeof(buf), "%s.%s", tmp, key + 4);
1036                 return alloc_string(buf);
1037         }
1038
1039         tmp = expr_to_var_sym(arg, sym);
1040         if (!tmp)
1041                 return NULL;
1042         snprintf(buf, sizeof(buf), "%s%s", tmp, key + 2);
1043         free_string(tmp);
1044         return alloc_string(buf);
1045 }
1046
1047 const char *get_param_name(struct sm_state *sm)
1048 {
1049         char *param_name;
1050         int name_len;
1051         static char buf[256];
1052
1053         if (!sm->sym->ident)
1054                 return NULL;
1055
1056         param_name = sm->sym->ident->name;
1057         name_len = strlen(param_name);
1058
1059         if (strcmp(sm->name, param_name) == 0) {
1060                 return "$$";
1061         } else if (sm->name[name_len] == '-' && /* check for '-' from "->" */
1062             strncmp(sm->name, param_name, name_len) == 0) {
1063                 snprintf(buf, sizeof(buf), "$$%s", sm->name + name_len);
1064                 return buf;
1065         } else if (sm->name[0] == '*' && strcmp(sm->name + 1, param_name) == 0) {
1066                 return "*$$";
1067         }
1068         return NULL;
1069 }
1070