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 /* like run_sql() but for the in-memory database */
  22 #define mem_sql(call_back, sql...)                                              \
  23 do {                                                                            \
  24         char sql_txt[1024];                                                     \
  25         int rc;                                                                 \
  26         char *err = NULL;                                                       \
  27                                                                                 \
  28         snprintf(sql_txt, sizeof(sql_txt), sql);                                \
  29         sm_debug("in-mem: %s\n", sql_txt);                                      \
  30         rc = sqlite3_exec(mem_db, sql_txt, call_back, 0, &err);                 \
  31         if (rc != SQLITE_OK) {                                                  \
  32                 fprintf(stderr, "SQL error #2: %s\n", err);                     \
  33                 fprintf(stderr, "SQL: '%s'\n", sql_txt);                        \
  34         }                                                                       \
  35 } while (0)
  36
  37 #define sql_insert(table, values...)                                            \
  38 do {                                                                            \
  39         if (__inline_fn) {                                                      \
  40                 char buf[1024];                                                 \
  41                 char *err, *p = buf;                                            \
  42                 int rc;                                                         \
  43                                                                                 \
  44                 p += snprintf(p, buf + sizeof(buf) - p,                         \
  45                               "insert into %s values (", #table);               \
  46                 p += snprintf(p, buf + sizeof(buf) - p, values);                \
  47                 p += snprintf(p, buf + sizeof(buf) - p, ");");                  \
  48                 sm_debug("mem-db: %s\n", buf);                                  \
  49                 rc = sqlite3_exec(mem_db, buf, NULL, 0, &err);                  \
  50                 if (rc != SQLITE_OK) {                                          \
  51                         fprintf(stderr, "SQL error #2: %s\n", err);             \
  52                         fprintf(stderr, "SQL: '%s'\n", buf);                    \
  53                 }                                                               \
  54                 return;                                                         \
  55         }                                                                       \
  56         if (option_info) {                                                      \
  57                 sm_prefix();                                                    \
  58                 sm_printf("SQL: insert into " #table " values (" values);       \
  59                 sm_printf(");\n");                                              \
  60         }                                                                       \
  61 } while (0)
  62
  63 struct def_callback {
  64         int hook_type;
  65         void (*callback)(const char *name, struct symbol *sym, char *key, char *value);
  66 };
  67 ALLOCATOR(def_callback, "definition db hook callbacks");
  68 DECLARE_PTR_LIST(callback_list, struct def_callback);
  69 static struct callback_list *callbacks;
  70
  71 struct member_info_callback {
  72         int owner;
  73         void (*callback)(struct expression *call, int param, char *printed_name, struct smatch_state *state);
  74 };
  75 ALLOCATOR(member_info_callback, "caller_info callbacks");
  76 DECLARE_PTR_LIST(member_info_cb_list, struct member_info_callback);
  77 static struct member_info_cb_list *member_callbacks;
  78
  79 struct returned_state_callback {
  80         void (*callback)(int return_id, char *return_ranges, struct expression *return_expr, struct state_list *slist);
  81 };
  82 ALLOCATOR(returned_state_callback, "returned state callbacks");
  83 DECLARE_PTR_LIST(returned_state_cb_list, struct returned_state_callback);
  84 static struct returned_state_cb_list *returned_state_callbacks;
  85
  86 struct returned_member_callback {
  87         int owner;
  88         void (*callback)(int return_id, char *return_ranges, char *printed_name, struct smatch_state *state);
  89 };
  90 ALLOCATOR(returned_member_callback, "returned member callbacks");
  91 DECLARE_PTR_LIST(returned_member_cb_list, struct returned_member_callback);
  92 static struct returned_member_cb_list *returned_member_callbacks;
  93
  94 struct call_implies_callback {
  95         int type;
  96         void (*callback)(struct expression *arg, char *value);
  97 };
  98 ALLOCATOR(call_implies_callback, "call_implies callbacks");
  99 DECLARE_PTR_LIST(call_implies_cb_list, struct call_implies_callback);
 100 static struct call_implies_cb_list *call_implies_cb_list;
 101
 102 void sql_exec(int (*callback)(void*, int, char**, char**), const char *sql)
 103 {
 104         char *err = NULL;
 105         int rc;
 106
 107         if (option_no_db || !db)
 108                 return;
 109
 110         rc = sqlite3_exec(db, sql, callback, 0, &err);
 111         if (rc != SQLITE_OK) {
 112                 fprintf(stderr, "SQL error #2: %s\n", err);
 113                 fprintf(stderr, "SQL: '%s'\n", sql);
 114         }
 115 }
 116
 117 void sql_insert_return_states(int return_id, const char *return_ranges,
 118                 int type, int param, const char *key, const char *value)
 119 {
 120         sql_insert(return_states, "'%s', '%s', %lu, %d, '%s', %d, %d, %d, '%s', '%s'",
 121                    get_filename(), get_function(), (unsigned long)__inline_fn,
 122                    return_id, return_ranges, fn_static(), type, param, key, value);
 123 }
 124
 125 void sql_insert_caller_info(struct expression *call, int type,
 126                 int param, const char *key, const char *value)
 127 {
 128         char *fn;
 129
 130         if (!option_info && !__inline_call)
 131                 return;
 132
 133         fn = get_fnptr_name(call->fn);
 134         if (!fn)
 135                 return;
 136
 137         if (__inline_call) {
 138                 char buf[1024];
 139                 char *err;
 140                 int rc;
 141
 142                 snprintf(buf, sizeof(buf), "insert into caller_info values ("
 143                          "'%s', '%s', '%s', %lu, %d, %d, %d, '%s', '%s');",
 144                          get_filename(), get_function(), fn,
 145                          (unsigned long)call, is_static(call->fn), type, param,
 146                          key, value);
 147                 sm_debug("in-mem: %s\n", buf);
 148                 rc = sqlite3_exec(mem_db, buf, NULL, 0, &err);
 149                 if (rc != SQLITE_OK) {
 150                         fprintf(stderr, "SQL error #2: %s\n", err);
 151                         fprintf(stderr, "SQL: '%s'\n", buf);
 152                 }
 153         }
 154
 155         if (!option_info)
 156                 return;
 157
 158         if (strncmp(fn, "__builtin_", 10) == 0)
 159                 return;
 160
 161         sm_msg("SQL_caller_info: insert into caller_info values ("
 162                "'%s', '%s', '%s', %%CALL_ID%%, %d, %d, %d, '%s', '%s');",
 163                get_filename(), get_function(), fn, is_static(call->fn),
 164                type, param, key, value);
 165
 166         free_string(fn);
 167 }
 168
 169 void sql_insert_function_ptr(const char *fn, const char *struct_name)
 170 {
 171         sql_insert(function_ptr, "'%s', '%s', '%s'", get_filename(), fn,
 172                    struct_name);
 173 }
 174
 175 void sql_insert_return_values(const char *return_values)
 176 {
 177         sql_insert(return_values, "'%s', '%s', %lu, %d, '%s'", get_filename(),
 178                    get_function(), (unsigned long)__inline_fn, fn_static(),
 179                    return_values);
 180 }
 181
 182 void sql_insert_call_implies(int type, int param, int value)
 183 {
 184         sql_insert(call_implies, "'%s', '%s', %lu, %d, %d, %d, %d", get_filename(),
 185                    get_function(), (unsigned long)__inline_fn, fn_static(),
 186                    type, param, value);
 187 }
 188
 189 void sql_insert_type_size(const char *member, int size)
 190 {
 191         sql_insert(type_size, "'%s', '%s', %d", get_filename(), member, size);
 192 }
 193
 194 static char *get_static_filter(struct symbol *sym)
 195 {
 196         static char sql_filter[1024];
 197
 198         if (sym->ctype.modifiers & MOD_STATIC) {
 199                 snprintf(sql_filter, sizeof(sql_filter),
 200                          "file = '%s' and function = '%s' and static = '1'",
 201                          get_filename(), sym->ident->name);
 202         } else {
 203                 snprintf(sql_filter, sizeof(sql_filter),
 204                          "function = '%s' and static = '0'", sym->ident->name);
 205         }
 206
 207         return sql_filter;
 208 }
 209
 210 void sql_select_return_states(const char *cols, struct expression *call,
 211         int (*callback)(void*, int, char**, char**))
 212 {
 213         if (call->fn->type != EXPR_SYMBOL || !call->fn->symbol)
 214                 return;
 215
 216         if (inlinable(call->fn)) {
 217                 mem_sql(callback,
 218                         "select %s from return_states where call_id = '%lu';",
 219                         cols, (unsigned long)call);
 220                 return;
 221         }
 222
 223         run_sql(callback, "select %s from return_states where %s;",
 224                 cols, get_static_filter(call->fn->symbol));
 225 }
 226
 227 void sql_select_call_implies(const char *cols, struct expression *call,
 228         int (*callback)(void*, int, char**, char**))
 229 {
 230         if (call->fn->type != EXPR_SYMBOL || !call->fn->symbol)
 231                 return;
 232
 233         if (inlinable(call->fn)) {
 234                 mem_sql(callback,
 235                         "select %s from call_implies where call_id = '%lu';",
 236                         cols, (unsigned long)call);
 237                 return;
 238         }
 239
 240         run_sql(callback, "select %s from call_implies where %s;",
 241                 cols, get_static_filter(call->fn->symbol));
 242 }
 243
 244 void sql_select_return_values(const char *cols, struct expression *call,
 245         int (*callback)(void*, int, char**, char**))
 246 {
 247         if (call->fn->type != EXPR_SYMBOL || !call->fn->symbol)
 248                 return;
 249
 250         if (inlinable(call->fn)) {
 251                 mem_sql(callback,
 252                         "select %s from return_values where call_id = '%lu';",
 253                         cols, (unsigned long)call);
 254                 return;
 255         }
 256
 257         run_sql(callback, "select %s from return_values where %s;",
 258                 cols, get_static_filter(call->fn->symbol));
 259 }
 260
 261 void sql_select_caller_info(const char *cols, struct symbol *sym,
 262         int (*callback)(void*, int, char**, char**))
 263 {
 264         if (__inline_fn) {
 265                 mem_sql(callback, "select %s from caller_info where call_id = %lu;",
 266                         cols, (unsigned long)__inline_fn);
 267                 return;
 268         }
 269
 270         run_sql(callback,
 271                 "select %s from caller_info where %s order by call_id;",
 272                 cols, get_static_filter(sym));
 273 }
 274
 275 void add_definition_db_callback(void (*callback)(const char *name, struct symbol *sym, char *key, char *value), int type)
 276 {
 277         struct def_callback *def_callback = __alloc_def_callback(0);
 278
 279         def_callback->hook_type = type;
 280         def_callback->callback = callback;
 281         add_ptr_list(&callbacks, def_callback);
 282 }
 283
 284 /*
 285  * These call backs are used when the --info option is turned on to print struct
 286  * member information.  For example foo->bar could have a state in
 287  * smatch_extra.c and also check_user.c.
 288  */
 289 void add_member_info_callback(int owner, void (*callback)(struct expression *call, int param, char *printed_name, struct smatch_state *state))
 290 {
 291         struct member_info_callback *member_callback = __alloc_member_info_callback(0);
 292
 293         member_callback->owner = owner;
 294         member_callback->callback = callback;
 295         add_ptr_list(&member_callbacks, member_callback);
 296 }
 297
 298 void add_returned_state_callback(void (*fn)(int return_id, char *return_ranges, struct expression *returned_expr, struct state_list *slist))
 299 {
 300         struct returned_state_callback *callback = __alloc_returned_state_callback(0);
 301
 302         callback->callback = fn;
 303         add_ptr_list(&returned_state_callbacks, callback);
 304 }
 305
 306 void add_returned_member_callback(int owner, void (*callback)(int return_id, char *return_ranges, char *printed_name, struct smatch_state *state))
 307 {
 308         struct returned_member_callback *member_callback = __alloc_returned_member_callback(0);
 309
 310         member_callback->owner = owner;
 311         member_callback->callback = callback;
 312         add_ptr_list(&returned_member_callbacks, member_callback);
 313 }
 314
 315 void add_db_fn_call_callback(int type, void (*callback)(struct expression *arg, char *value))
 316 {
 317         struct call_implies_callback *cb = __alloc_call_implies_callback(0);
 318
 319         cb->type = type;
 320         cb->callback = callback;
 321         add_ptr_list(&call_implies_cb_list, cb);
 322 }
 323
 324 static struct symbol *return_type;
 325 static struct range_list *return_range_list;
 326 static int db_return_callback(void *unused, int argc, char **argv, char **azColName)
 327 {
 328         if (argc != 1)
 329                 return 0;
 330         if (option_debug)
 331                 sm_msg("return type %d", type_positive_bits(return_type));
 332         str_to_rl(return_type, argv[0], &return_range_list);
 333         return 0;
 334 }
 335
 336 struct range_list *db_return_vals(struct expression *expr)
 337 {
 338         return_type = get_type(expr);
 339         if (!return_type)
 340                 return NULL;
 341         return_range_list = NULL;
 342         sql_select_return_values("return", expr, db_return_callback);
 343         return return_range_list;
 344 }
 345
 346 static void match_call_marker(struct expression *expr)
 347 {
 348         /*
 349          * we just want to record something in the database so that if we have
 350          * two calls like:  frob(4); frob(some_unkown); then on the receiving
 351          * side we know that sometimes frob is called with unknown parameters.
 352          */
 353
 354         sql_insert_caller_info(expr, INTERNAL, -1, "%call_marker%", "");
 355 }
 356
 357 static void print_struct_members(struct expression *call, struct expression *expr, int param, struct state_list *slist,
 358         void (*callback)(struct expression *call, int param, char *printed_name, struct smatch_state *state))
 359 {
 360         struct sm_state *sm;
 361         char *name;
 362         struct symbol *sym;
 363         int len;
 364         char printed_name[256];
 365         int is_address = 0;
 366
 367         expr = strip_expr(expr);
 368         if (expr->type == EXPR_PREOP && expr->op == '&') {
 369                 expr = strip_expr(expr->unop);
 370                 is_address = 1;
 371         }
 372
 373         name = expr_to_var_sym(expr, &sym);
 374         if (!name || !sym)
 375                 goto free;
 376
 377         len = strlen(name);
 378         FOR_EACH_PTR(slist, sm) {
 379                 if (sm->sym != sym)
 380                         continue;
 381                 if (strcmp(name, sm->name) == 0) {
 382                         if (is_address)
 383                                 snprintf(printed_name, sizeof(printed_name), "*$$");
 384                         else /* these are already handled. fixme: handle them here */
 385                                 continue;
 386                 } else if (sm->name[0] == '*' && strcmp(name, sm->name + 1) == 0) {
 387                         snprintf(printed_name, sizeof(printed_name), "*$$");
 388                 } else if (strncmp(name, sm->name, len) == 0) {
 389                         if (is_address)
 390                                 snprintf(printed_name, sizeof(printed_name), "$$->%s", sm->name + len + 1);
 391                         else
 392                                 snprintf(printed_name, sizeof(printed_name), "$$%s", sm->name + len);
 393                 } else {
 394                         continue;
 395                 }
 396                 callback(call, param, printed_name, sm->state);
 397         } END_FOR_EACH_PTR(sm);
 398 free:
 399         free_string(name);
 400 }
 401
 402 static void match_call_info(struct expression *call)
 403 {
 404         struct member_info_callback *cb;
 405         struct expression *arg;
 406         struct state_list *slist;
 407         char *name;
 408         int i;
 409
 410         name = get_fnptr_name(call->fn);
 411         if (!name)
 412                 return;
 413
 414         FOR_EACH_PTR(member_callbacks, cb) {
 415                 slist = get_all_states(cb->owner);
 416                 i = 0;
 417                 FOR_EACH_PTR(call->args, arg) {
 418                         print_struct_members(call, arg, i, slist, cb->callback);
 419                         i++;
 420                 } END_FOR_EACH_PTR(arg);
 421                 free_slist(&slist);
 422         } END_FOR_EACH_PTR(cb);
 423
 424         free_string(name);
 425 }
 426
 427 static int get_param(int param, char **name, struct symbol **sym)
 428 {
 429         struct symbol *arg;
 430         int i;
 431
 432         i = 0;
 433         FOR_EACH_PTR(cur_func_sym->ctype.base_type->arguments, arg) {
 434                 /*
 435                  * this is a temporary hack to work around a bug (I think in sparse?)
 436                  * 2.6.37-rc1:fs/reiserfs/journal.o
 437                  * If there is a function definition without parameter name found
 438                  * after a function implementation then it causes a crash.
 439                  * int foo() {}
 440                  * int bar(char *);
 441                  */
 442                 if (arg->ident->name < (char *)100)
 443                         continue;
 444                 if (i == param && arg->ident->name) {
 445                         *name = arg->ident->name;
 446                         *sym = arg;
 447                         return TRUE;
 448                 }
 449                 i++;
 450         } END_FOR_EACH_PTR(arg);
 451
 452         return FALSE;
 453 }
 454
 455 static struct state_list *final_states;
 456 static int prev_func_id = -1;
 457 static int db_callback(void *unused, int argc, char **argv, char **azColName)
 458 {
 459         int func_id;
 460         long type;
 461         long param;
 462         char *name = NULL;
 463         struct symbol *sym = NULL;
 464         struct def_callback *def_callback;
 465
 466         if (argc != 5)
 467                 return 0;
 468
 469         func_id = atoi(argv[0]);
 470         errno = 0;
 471         type = strtol(argv[1], NULL, 10);
 472         param = strtol(argv[2], NULL, 10);
 473         if (errno)
 474                 return 0;
 475
 476         if (prev_func_id == -1)
 477                 prev_func_id = func_id;
 478         if (func_id != prev_func_id) {
 479                 merge_slist(&final_states, __pop_fake_cur_slist());
 480                 __push_fake_cur_slist();
 481                 __unnullify_path();
 482                 prev_func_id = func_id;
 483         }
 484
 485         if (type == INTERNAL)
 486                 return 0;
 487         if (param >= 0 && !get_param(param, &name, &sym))
 488                 return 0;
 489
 490         FOR_EACH_PTR(callbacks, def_callback) {
 491                 if (def_callback->hook_type == type)
 492                         def_callback->callback(name, sym, argv[3], argv[4]);
 493         } END_FOR_EACH_PTR(def_callback);
 494
 495         return 0;
 496 }
 497
 498 static void get_direct_callers(struct symbol *sym)
 499 {
 500         sql_select_caller_info("call_id, type, parameter, key, value", sym,
 501                         db_callback);
 502 }
 503
 504 static char *ptr_name;
 505 static int ptr_cnt;
 506 static int get_ptr_name(void *unused, int argc, char **argv, char **azColName)
 507 {
 508         if (ptr_cnt++) {
 509                 free_string(ptr_name);
 510                 ptr_name = NULL;
 511                 return 0;
 512         }
 513         if (!ptr_name)
 514                 ptr_name = alloc_string(argv[0]);
 515         return 0;
 516 }
 517
 518 static void get_function_pointer_callers(struct symbol *sym)
 519 {
 520         char sql_filter[1024];
 521
 522         if (sym->ctype.modifiers & MOD_STATIC) {
 523                 snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
 524                          get_filename(), sym->ident->name);
 525         } else {
 526                 snprintf(sql_filter, 1024, "function = '%s';",
 527                          sym->ident->name);
 528         }
 529
 530         ptr_name = NULL;
 531         ptr_cnt = 0;
 532         run_sql(get_ptr_name,
 533                 "select distinct ptr from function_ptr where %s",
 534                 sql_filter);
 535         if (!ptr_name)
 536                 return;
 537
 538         run_sql(db_callback, "select call_id, type, parameter, key, value from caller_info"
 539                 " where function = '%s' order by call_id", ptr_name);
 540
 541         free_string(ptr_name);
 542 }
 543
 544 static void match_data_from_db(struct symbol *sym)
 545 {
 546         struct sm_state *sm;
 547
 548         if (!sym || !sym->ident || !sym->ident->name)
 549                 return;
 550
 551         __push_fake_cur_slist();
 552         __unnullify_path();
 553         prev_func_id = -1;
 554
 555         get_direct_callers(sym);
 556         get_function_pointer_callers(sym);
 557
 558         merge_slist(&final_states, __pop_fake_cur_slist());
 559
 560         FOR_EACH_PTR(final_states, sm) {
 561                 __set_sm(sm);
 562         } END_FOR_EACH_PTR(sm);
 563
 564         free_slist(&final_states);
 565 }
 566
 567 static void match_function_assign(struct expression *expr)
 568 {
 569         struct expression *right = expr->right;
 570         struct symbol *sym;
 571         char *fn_name;
 572         char *ptr_name;
 573
 574         if (right->type == EXPR_PREOP && right->op == '&')
 575                 right = strip_expr(right->unop);
 576         if (right->type != EXPR_SYMBOL)
 577                 return;
 578         sym = get_type(right);
 579         if (!sym || sym->type != SYM_FN)
 580                 return;
 581
 582         fn_name = expr_to_var(right);
 583         ptr_name = get_fnptr_name(expr->left);
 584         if (!fn_name || !ptr_name)
 585                 goto free;
 586
 587         sql_insert_function_ptr(fn_name, ptr_name);
 588
 589 free:
 590         free_string(fn_name);
 591         free_string(ptr_name);
 592 }
 593
 594 static struct expression *call_implies_call_expr;
 595 static int call_implies_callbacks(void *unused, int argc, char **argv, char **azColName)
 596 {
 597         struct call_implies_callback *cb;
 598         struct expression *arg = NULL;
 599         int type;
 600         int param;
 601
 602         if (argc != 4)
 603                 return 0;
 604
 605         type = atoi(argv[1]);
 606         param = atoi(argv[2]);
 607
 608         FOR_EACH_PTR(call_implies_cb_list, cb) {
 609                 if (cb->type != type)
 610                         continue;
 611                 if (param != -1) {
 612                         arg = get_argument_from_call_expr(call_implies_call_expr->args, param);
 613                         if (!arg)
 614                                 continue;
 615                 }
 616                 cb->callback(arg, argv[3]);
 617         } END_FOR_EACH_PTR(cb);
 618
 619         return 0;
 620 }
 621
 622 static void match_call_implies(struct expression *expr)
 623 {
 624         call_implies_call_expr = expr;
 625         sql_select_call_implies("function, type, parameter, value", expr,
 626                                 call_implies_callbacks);
 627         return;
 628 }
 629
 630 static void print_initializer_list(struct expression_list *expr_list,
 631                 struct symbol *struct_type)
 632 {
 633         struct expression *expr;
 634         struct symbol *base_type;
 635         char struct_name[256];
 636
 637         FOR_EACH_PTR(expr_list, expr) {
 638                 if (expr->type == EXPR_INDEX && expr->idx_expression && expr->idx_expression->type == EXPR_INITIALIZER) {
 639                         print_initializer_list(expr->idx_expression->expr_list, struct_type);
 640                         continue;
 641                 }
 642                 if (expr->type != EXPR_IDENTIFIER)
 643                         continue;
 644                 if (!expr->expr_ident)
 645                         continue;
 646                 if (!expr->ident_expression || !expr->ident_expression->symbol_name)
 647                         continue;
 648                 base_type = get_type(expr->ident_expression);
 649                 if (!base_type || base_type->type != SYM_FN)
 650                         continue;
 651                 snprintf(struct_name, sizeof(struct_name), "(struct %s)->%s",
 652                          struct_type->ident->name, expr->expr_ident->name);
 653                 sql_insert_function_ptr(expr->ident_expression->symbol_name->name,
 654                                         struct_name);
 655         } END_FOR_EACH_PTR(expr);
 656 }
 657
 658 static void global_variable(struct symbol *sym)
 659 {
 660         struct symbol *struct_type;
 661
 662         if (!sym->ident)
 663                 return;
 664         if (!sym->initializer || sym->initializer->type != EXPR_INITIALIZER)
 665                 return;
 666         struct_type = get_base_type(sym);
 667         if (!struct_type)
 668                 return;
 669         if (struct_type->type == SYM_ARRAY) {
 670                 struct_type = get_base_type(struct_type);
 671                 if (!struct_type)
 672                         return;
 673         }
 674         if (struct_type->type != SYM_STRUCT || !struct_type->ident)
 675                 return;
 676         print_initializer_list(sym->initializer->expr_list, struct_type);
 677 }
 678
 679 static void match_return_info(int return_id, char *return_ranges, struct expression *expr, struct state_list *slist)
 680 {
 681         sql_insert_return_states(return_id, return_ranges, INTERNAL, -1, "", "");
 682 }
 683
 684 static int return_id;
 685 static void match_function_def(struct symbol *sym)
 686 {
 687         return_id = 0;
 688 }
 689
 690 static void call_return_state_hooks_compare(struct expression *expr)
 691 {
 692         struct returned_state_callback *cb;
 693         struct state_list *slist;
 694         char *return_ranges;
 695         int final_pass_orig = final_pass;
 696
 697         __push_fake_cur_slist();
 698
 699         final_pass = 0;
 700         __split_whole_condition(expr);
 701         final_pass = final_pass_orig;
 702
 703         return_ranges = alloc_sname("1");
 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         __push_true_states();
 712         __use_false_states();
 713
 714         return_ranges = alloc_sname("0");;
 715         return_id++;
 716         slist = __get_cur_slist();
 717         FOR_EACH_PTR(returned_state_callbacks, cb) {
 718                 cb->callback(return_id, return_ranges, expr, slist);
 719         } END_FOR_EACH_PTR(cb);
 720
 721         __merge_true_states();
 722         __pop_fake_cur_slist();
 723 }
 724
 725 static int call_return_state_hooks_split_possible(struct expression *expr)
 726 {
 727         struct returned_state_callback *cb;
 728         struct state_list *slist;
 729         struct range_list *rl;
 730         char *return_ranges;
 731         struct sm_state *sm;
 732         struct sm_state *tmp;
 733         int ret = 0;
 734         int nr_possible, nr_states;
 735
 736         sm = get_sm_state_expr(SMATCH_EXTRA, expr);
 737         if (!sm || !sm->merged)
 738                 return 0;
 739
 740         /* bail if it gets too complicated */
 741         nr_possible = ptr_list_size((struct ptr_list *)sm->possible);
 742         nr_states = ptr_list_size((struct ptr_list *)__get_cur_slist());
 743         if (nr_possible >= 100)
 744                 return 0;
 745         if (nr_states * nr_possible >= 1000)
 746                 return 0;
 747
 748         FOR_EACH_PTR(sm->possible, tmp) {
 749                 if (tmp->merged)
 750                         continue;
 751
 752                 ret = 1;
 753                 __push_fake_cur_slist();
 754
 755                 overwrite_states_using_pool(tmp);
 756
 757                 rl = cast_rl(cur_func_return_type(), estate_rl(tmp->state));
 758                 return_ranges = show_rl(rl);
 759
 760                 return_id++;
 761                 slist = __get_cur_slist();
 762                 FOR_EACH_PTR(returned_state_callbacks, cb) {
 763                         cb->callback(return_id, return_ranges, expr, slist);
 764                 } END_FOR_EACH_PTR(cb);
 765
 766                 __pop_fake_cur_slist();
 767         } END_FOR_EACH_PTR(tmp);
 768
 769         return ret;
 770 }
 771
 772 static void call_return_state_hooks(struct expression *expr)
 773 {
 774         struct returned_state_callback *cb;
 775         struct state_list *slist;
 776         struct range_list *rl;
 777         char *return_ranges;
 778         int nr_states;
 779
 780         expr = strip_expr(expr);
 781
 782         if (!expr) {
 783                 return_ranges = alloc_sname("");
 784         } else if (is_condition(expr)) {
 785                 call_return_state_hooks_compare(expr);
 786                 return;
 787         } else if (call_return_state_hooks_split_possible(expr)) {
 788                 return;
 789         } else if (get_implied_rl(expr, &rl)) {
 790                 rl = cast_rl(cur_func_return_type(), rl);
 791                 return_ranges = show_rl(rl);
 792         } else {
 793                 rl = alloc_whole_rl(cur_func_return_type());
 794                 return_ranges = show_rl(rl);
 795         }
 796
 797         return_id++;
 798         slist = __get_cur_slist();
 799         nr_states = ptr_list_size((struct ptr_list *)__get_cur_slist());
 800         FOR_EACH_PTR(returned_state_callbacks, cb) {
 801                 if (nr_states < 10000)
 802                         cb->callback(return_id, return_ranges, expr, slist);
 803                 else
 804                         cb->callback(return_id, return_ranges, expr, NULL);
 805         } END_FOR_EACH_PTR(cb);
 806 }
 807
 808 static void print_returned_struct_members(int return_id, char *return_ranges, struct expression *expr, struct state_list *slist)
 809 {
 810         struct returned_member_callback *cb;
 811         struct state_list *my_slist;
 812         struct sm_state *sm;
 813         struct symbol *type;
 814         char *name;
 815         char member_name[256];
 816         int len;
 817
 818         type = get_type(expr);
 819         if (!type || type->type != SYM_PTR)
 820                 return;
 821         type = get_real_base_type(type);
 822         if (!type || type->type != SYM_STRUCT)
 823                 return;
 824         name = expr_to_var(expr);
 825         if (!name)
 826                 return;
 827
 828         member_name[sizeof(member_name) - 1] = '\0';
 829         strcpy(member_name, "$$");
 830
 831         len = strlen(name);
 832         FOR_EACH_PTR(returned_member_callbacks, cb) {
 833                 my_slist = get_all_states_slist(cb->owner, slist);
 834                 FOR_EACH_PTR(my_slist, sm) {
 835                         if (strncmp(sm->name, name, len) != 0)
 836                                 continue;
 837                         if (strncmp(sm->name + len, "->", 2) != 0)
 838                                 continue;
 839                         strncpy(member_name + 2, sm->name + len, sizeof(member_name) - 2);
 840                         cb->callback(return_id, return_ranges, member_name, sm->state);
 841                 } END_FOR_EACH_PTR(sm);
 842                 free_slist(&my_slist);
 843         } END_FOR_EACH_PTR(cb);
 844
 845         free_string(name);
 846 }
 847
 848 static void reset_memdb(void)
 849 {
 850         mem_sql(NULL, "delete from caller_info;");
 851         mem_sql(NULL, "delete from return_states;");
 852         mem_sql(NULL, "delete from call_implies;");
 853         mem_sql(NULL, "delete from return_values;");
 854 }
 855
 856 static void match_end_func_info(struct symbol *sym)
 857 {
 858         if (__path_is_null())
 859                 return;
 860         call_return_state_hooks(NULL);
 861         if (!__inline_fn)
 862                 reset_memdb();
 863 }
 864
 865 static void init_memdb(void)
 866 {
 867         char *err = NULL;
 868         int rc;
 869         const char *schema_files[] = {
 870                 "db/caller_info.schema",
 871                 "db/return_states.schema",
 872                 "db/call_implies.schema",
 873                 "db/return_values.schema",
 874         };
 875         static char buf[4096];
 876         int fd;
 877         int ret;
 878         int i;
 879
 880         rc = sqlite3_open(":memory:", &mem_db);
 881         if (rc != SQLITE_OK) {
 882                 printf("Error starting In-Memory database.");
 883                 return;
 884         }
 885
 886         for (i = 0; i < ARRAY_SIZE(schema_files); i++) {
 887                 fd = open_data_file(schema_files[i]);
 888                 if (fd < 0)
 889                         continue;
 890                 ret = read(fd, buf, sizeof(buf));
 891                 if (ret == sizeof(buf)) {
 892                         printf("Schema file too large:  %s (limit %zd bytes)",
 893                                schema_files[i], sizeof(buf));
 894                 }
 895                 buf[ret] = '\0';
 896                 rc = sqlite3_exec(mem_db, buf, NULL, 0, &err);
 897                 if (rc != SQLITE_OK) {
 898                         fprintf(stderr, "SQL error #2: %s\n", err);
 899                         fprintf(stderr, "%s\n", buf);
 900                 }
 901         }
 902 }
 903
 904 void open_smatch_db(void)
 905 {
 906         int rc;
 907
 908         if (option_no_db)
 909                 return;
 910
 911         init_memdb();
 912
 913         rc = sqlite3_open_v2("smatch_db.sqlite", &db, SQLITE_OPEN_READONLY, NULL);
 914         if (rc != SQLITE_OK) {
 915                 option_no_db = 1;
 916                 return;
 917         }
 918         return;
 919 }
 920
 921 void register_definition_db_callbacks(int id)
 922 {
 923         add_hook(&match_function_def, FUNC_DEF_HOOK);
 924
 925         add_hook(&match_call_info, FUNCTION_CALL_HOOK);
 926         add_hook(&match_function_assign, ASSIGNMENT_HOOK);
 927         add_hook(&global_variable, BASE_HOOK);
 928         add_hook(&global_variable, DECLARATION_HOOK);
 929         add_returned_state_callback(match_return_info);
 930         add_returned_state_callback(print_returned_struct_members);
 931         add_hook(&call_return_state_hooks, RETURN_HOOK);
 932         add_hook(&match_end_func_info, END_FUNC_HOOK);
 933
 934         add_hook(&match_data_from_db, FUNC_DEF_HOOK);
 935         add_hook(&match_call_implies, CALL_HOOK_AFTER_INLINE);
 936 }
 937
 938 void register_db_call_marker(int id)
 939 {
 940         add_hook(&match_call_marker, FUNCTION_CALL_HOOK);
 941 }
 942
 943 char *get_variable_from_key(struct expression *arg, char *key, struct symbol **sym)
 944 {
 945         char buf[256];
 946         char *tmp;
 947
 948         if (strcmp(key, "$$") == 0)
 949                 return expr_to_var_sym(arg, sym);
 950
 951         if (strcmp(key, "*$$") == 0) {
 952                 if (arg->type == EXPR_PREOP && arg->op == '&') {
 953                         arg = strip_expr(arg->unop);
 954                         return expr_to_var_sym(arg, sym);
 955                 } else {
 956                         tmp = expr_to_var_sym(arg, sym);
 957                         if (!tmp)
 958                                 return NULL;
 959                         snprintf(buf, sizeof(buf), "*%s", tmp);
 960                         free_string(tmp);
 961                         return alloc_string(buf);
 962                 }
 963         }
 964
 965         if (arg->type == EXPR_PREOP && arg->op == '&') {
 966                 arg = strip_expr(arg->unop);
 967                 tmp = expr_to_var_sym(arg, sym);
 968                 if (!tmp)
 969                         return NULL;
 970                 snprintf(buf, sizeof(buf), "%s.%s", tmp, key + 4);
 971                 return alloc_string(buf);
 972         }
 973
 974         tmp = expr_to_var_sym(arg, sym);
 975         if (!tmp)
 976                 return NULL;
 977         snprintf(buf, sizeof(buf), "%s%s", tmp, key + 2);
 978         free_string(tmp);
 979         return alloc_string(buf);
 980 }
 981
 982