smatch_db.c

   1 /*
   2  * Copyright (C) 2010 Dan Carpenter.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
  16  */
  17
  18 #include <string.h>
  19 #include <errno.h>
  20 #include <sqlite3.h>
  21 #include <unistd.h>
  22 #include <ctype.h>
  23 #include "smatch.h"
  24 #include "smatch_slist.h"
  25 #include "smatch_extra.h"
  26
  27 static sqlite3 *db;
  28 static sqlite3 *mem_db;
  29
  30 static int return_id;
  31
  32 #define sql_insert(table, values...)                                            \
  33 do {                                                                            \
  34         if (!mem_db)                                                            \
  35                 break;                                                          \
  36         if (__inline_fn) {                                                      \
  37                 char buf[1024];                                                 \
  38                 char *err, *p = buf;                                            \
  39                 int rc;                                                         \
  40                                                                                 \
  41                 p += snprintf(p, buf + sizeof(buf) - p,                         \
  42                               "insert into %s values (", #table);               \
  43                 p += snprintf(p, buf + sizeof(buf) - p, values);                \
  44                 p += snprintf(p, buf + sizeof(buf) - p, ");");                  \
  45                 sm_debug("in-mem: %s\n", buf);                                  \
  46                 rc = sqlite3_exec(mem_db, buf, NULL, 0, &err);                  \
  47                 if (rc != SQLITE_OK) {                                          \
  48                         fprintf(stderr, "SQL error #2: %s\n", err);             \
  49                         fprintf(stderr, "SQL: '%s'\n", buf);                    \
  50                 }                                                               \
  51                 break;                                                          \
  52         }                                                                       \
  53         if (option_info) {                                                      \
  54                 sm_prefix();                                                    \
  55                 sm_printf("SQL: insert into " #table " values (" values);       \
  56                 sm_printf(");\n");                                              \
  57         }                                                                       \
  58 } while (0)
  59
  60 struct def_callback {
  61         int hook_type;
  62         void (*callback)(const char *name, struct symbol *sym, char *key, char *value);
  63 };
  64 ALLOCATOR(def_callback, "definition db hook callbacks");
  65 DECLARE_PTR_LIST(callback_list, struct def_callback);
  66 static struct callback_list *callbacks;
  67
  68 struct member_info_callback {
  69         int owner;
  70         void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm);
  71 };
  72 ALLOCATOR(member_info_callback, "caller_info callbacks");
  73 DECLARE_PTR_LIST(member_info_cb_list, struct member_info_callback);
  74 static struct member_info_cb_list *member_callbacks;
  75
  76 struct returned_state_callback {
  77         void (*callback)(int return_id, char *return_ranges, struct expression *return_expr);
  78 };
  79 ALLOCATOR(returned_state_callback, "returned state callbacks");
  80 DECLARE_PTR_LIST(returned_state_cb_list, struct returned_state_callback);
  81 static struct returned_state_cb_list *returned_state_callbacks;
  82
  83 struct returned_member_callback {
  84         int owner;
  85         void (*callback)(int return_id, char *return_ranges, struct expression *expr, char *printed_name, struct smatch_state *state);
  86 };
  87 ALLOCATOR(returned_member_callback, "returned member callbacks");
  88 DECLARE_PTR_LIST(returned_member_cb_list, struct returned_member_callback);
  89 static struct returned_member_cb_list *returned_member_callbacks;
  90
  91 struct call_implies_callback {
  92         int type;
  93         void (*callback)(struct expression *arg, char *key, char *value);
  94 };
  95 ALLOCATOR(call_implies_callback, "call_implies callbacks");
  96 DECLARE_PTR_LIST(call_implies_cb_list, struct call_implies_callback);
  97 static struct call_implies_cb_list *call_implies_cb_list;
  98
  99 static int print_sql_output(void *unused, int argc, char **argv, char **azColName)
 100 {
 101         int i;
 102
 103         for (i = 0; i < argc; i++) {
 104                 if (i != 0)
 105                         printf(", ");
 106                 sm_printf("%s", argv[i]);
 107         }
 108         sm_printf("\n");
 109         return 0;
 110 }
 111
 112 void debug_sql(const char *sql)
 113 {
 114         if (!option_debug)
 115                 return;
 116         sm_msg("%s", sql);
 117         sql_exec(print_sql_output, NULL, sql);
 118 }
 119
 120 void debug_mem_sql(const char *sql)
 121 {
 122         if (!option_debug)
 123                 return;
 124         sm_msg("%s", sql);
 125         sql_mem_exec(print_sql_output, NULL, sql);
 126 }
 127
 128 void sql_exec(int (*callback)(void*, int, char**, char**), void *data, const char *sql)
 129 {
 130         char *err = NULL;
 131         int rc;
 132
 133         if (option_no_db || !db)
 134                 return;
 135
 136         rc = sqlite3_exec(db, sql, callback, data, &err);
 137         if (rc != SQLITE_OK) {
 138                 fprintf(stderr, "SQL error #2: %s\n", err);
 139                 fprintf(stderr, "SQL: '%s'\n", sql);
 140         }
 141 }
 142
 143 void sql_mem_exec(int (*callback)(void*, int, char**, char**), void *data, const char *sql)
 144 {
 145         char *err = NULL;
 146         int rc;
 147
 148         if (!mem_db)
 149                 return;
 150
 151         rc = sqlite3_exec(mem_db, sql, callback, data, &err);
 152         if (rc != SQLITE_OK) {
 153                 fprintf(stderr, "SQL error #2: %s\n", err);
 154                 fprintf(stderr, "SQL: '%s'\n", sql);
 155         }
 156 }
 157
 158 void sql_insert_return_states(int return_id, const char *return_ranges,
 159                 int type, int param, const char *key, const char *value)
 160 {
 161         if (key && strlen(key) >= 80)
 162                 return;
 163         sql_insert(return_states, "'%s', '%s', %lu, %d, '%s', %d, %d, %d, '%s', '%s'",
 164                    get_base_file(), get_function(), (unsigned long)__inline_fn,
 165                    return_id, return_ranges, fn_static(), type, param, key, value);
 166 }
 167
 168 static struct string_list *common_funcs;
 169 static int is_common_function(const char *fn)
 170 {
 171         char *tmp;
 172
 173         if (strncmp(fn, "__builtin_", 10) == 0)
 174                 return 1;
 175
 176         FOR_EACH_PTR(common_funcs, tmp) {
 177                 if (strcmp(tmp, fn) == 0)
 178                         return 1;
 179         } END_FOR_EACH_PTR(tmp);
 180
 181         return 0;
 182 }
 183
 184 void sql_insert_caller_info(struct expression *call, int type,
 185                 int param, const char *key, const char *value)
 186 {
 187         char *fn;
 188
 189         if (!option_info && !__inline_call)
 190                 return;
 191
 192         if (key && strlen(key) >= 80)
 193                 return;
 194
 195         fn = get_fnptr_name(call->fn);
 196         if (!fn)
 197                 return;
 198
 199         if (__inline_call) {
 200                 mem_sql(NULL, NULL,
 201                         "insert into caller_info values ('%s', '%s', '%s', %lu, %d, %d, %d, '%s', '%s');",
 202                         get_base_file(), get_function(), fn, (unsigned long)call,
 203                         is_static(call->fn), type, param, key, value);
 204         }
 205
 206         if (!option_info)
 207                 return;
 208
 209         if (is_common_function(fn))
 210                 return;
 211
 212         sm_msg("SQL_caller_info: insert into caller_info values ("
 213                "'%s', '%s', '%s', %%CALL_ID%%, %d, %d, %d, '%s', '%s');",
 214                get_base_file(), get_function(), fn, is_static(call->fn),
 215                type, param, key, value);
 216
 217         free_string(fn);
 218 }
 219
 220 void sql_insert_function_ptr(const char *fn, const char *struct_name)
 221 {
 222         sql_insert(function_ptr, "'%s', '%s', '%s', 0", get_base_file(), fn,
 223                    struct_name);
 224 }
 225
 226 void sql_insert_call_implies(int type, int param, const char *key, const char *value)
 227 {
 228         sql_insert(call_implies, "'%s', '%s', %lu, %d, %d, %d, '%s', %s", get_base_file(),
 229                    get_function(), (unsigned long)__inline_fn, fn_static(),
 230                    type, param, key, value);
 231 }
 232
 233 void sql_insert_function_type_size(const char *member, const char *ranges)
 234 {
 235         sql_insert(function_type_size, "'%s', '%s', '%s', '%s'", get_base_file(), get_function(), member, ranges);
 236 }
 237
 238 void sql_insert_local_values(const char *name, const char *value)
 239 {
 240         sql_insert(local_values, "'%s', '%s', '%s'", get_base_file(), name, value);
 241 }
 242
 243 void sql_insert_function_type_value(const char *type, const char *value)
 244 {
 245         sql_insert(function_type_value, "'%s', '%s', '%s', '%s'", get_base_file(), get_function(), type, value);
 246 }
 247
 248 void sql_insert_function_type_info(int param, const char *value)
 249 {
 250         sql_insert(function_type_info, "'%s', '%s', %d, %d, '%s'",
 251                    get_base_file(), get_function(), fn_static(), param, value);
 252 }
 253
 254 void sql_insert_data_info(struct expression *data, int type, const char *value)
 255 {
 256         char *data_name;
 257
 258         data_name = get_data_info_name(data);
 259         if (!data_name)
 260                 return;
 261         sql_insert(data_info, "'%s', '%s', %d, '%s'", get_base_file(), data_name, type, value);
 262 }
 263
 264 char *get_static_filter(struct symbol *sym)
 265 {
 266         static char sql_filter[1024];
 267
 268         if (sym->ctype.modifiers & MOD_STATIC) {
 269                 snprintf(sql_filter, sizeof(sql_filter),
 270                          "file = '%s' and function = '%s' and static = '1'",
 271                          get_base_file(), sym->ident->name);
 272         } else {
 273                 snprintf(sql_filter, sizeof(sql_filter),
 274                          "function = '%s' and static = '0'", sym->ident->name);
 275         }
 276
 277         return sql_filter;
 278 }
 279
 280 static int row_count;
 281 static int get_row_count(void *unused, int argc, char **argv, char **azColName)
 282 {
 283         if (argc != 1)
 284                 return 0;
 285         row_count = atoi(argv[0]);
 286         return 0;
 287 }
 288
 289 static void sql_select_return_states_pointer(const char *cols,
 290         struct expression *call, int (*callback)(void*, int, char**, char**), void *info)
 291 {
 292         char *ptr;
 293
 294         ptr = get_fnptr_name(call->fn);
 295         if (!ptr)
 296                 return;
 297
 298         run_sql(callback, info,
 299                 "select %s from return_states join function_ptr where "
 300                 "return_states.function == function_ptr.function and ptr = '%s'"
 301                 "and searchable = 1 order by return_id, type;",
 302                 cols, ptr);
 303 }
 304
 305 static int is_local_symbol(struct expression *expr)
 306 {
 307         if (expr->type != EXPR_SYMBOL)
 308                 return 0;
 309         if (expr->symbol->ctype.modifiers & (MOD_NONLOCAL | MOD_STATIC | MOD_ADDRESSABLE))
 310                 return 0;
 311         return 1;
 312 }
 313
 314 void sql_select_return_states(const char *cols, struct expression *call,
 315         int (*callback)(void*, int, char**, char**), void *info)
 316 {
 317         if (is_fake_call(call))
 318                 return;
 319
 320         if (call->fn->type != EXPR_SYMBOL || !call->fn->symbol || is_local_symbol(call->fn)) {
 321                 sql_select_return_states_pointer(cols, call, callback, info);
 322                 return;
 323         }
 324
 325         if (inlinable(call->fn)) {
 326                 mem_sql(callback, info,
 327                         "select %s from return_states where call_id = '%lu' order by return_id, type;",
 328                         cols, (unsigned long)call);
 329                 return;
 330         }
 331
 332         row_count = 0;
 333         run_sql(get_row_count, info, "select count(*) from return_states where %s;",
 334                 get_static_filter(call->fn->symbol));
 335         if (row_count > 3000)
 336                 return;
 337
 338         run_sql(callback, info, "select %s from return_states where %s order by return_id, type;",
 339                 cols, get_static_filter(call->fn->symbol));
 340 }
 341
 342 void sql_select_call_implies(const char *cols, struct expression *call,
 343         int (*callback)(void*, int, char**, char**))
 344 {
 345         if (call->fn->type != EXPR_SYMBOL || !call->fn->symbol)
 346                 return;
 347
 348         if (inlinable(call->fn)) {
 349                 mem_sql(callback, NULL,
 350                         "select %s from call_implies where call_id = '%lu';",
 351                         cols, (unsigned long)call);
 352                 return;
 353         }
 354
 355         run_sql(callback, NULL, "select %s from call_implies where %s;",
 356                 cols, get_static_filter(call->fn->symbol));
 357 }
 358
 359 void sql_select_caller_info(const char *cols, struct symbol *sym,
 360         int (*callback)(void*, int, char**, char**))
 361 {
 362         if (__inline_fn) {
 363                 mem_sql(callback, NULL,
 364                         "select %s from caller_info where call_id = %lu;",
 365                         cols, (unsigned long)__inline_fn);
 366                 return;
 367         }
 368
 369         run_sql(callback, NULL,
 370                 "select %s from caller_info where %s order by call_id;",
 371                 cols, get_static_filter(sym));
 372 }
 373
 374 void select_caller_info_hook(void (*callback)(const char *name, struct symbol *sym, char *key, char *value), int type)
 375 {
 376         struct def_callback *def_callback = __alloc_def_callback(0);
 377
 378         def_callback->hook_type = type;
 379         def_callback->callback = callback;
 380         add_ptr_list(&callbacks, def_callback);
 381 }
 382
 383 /*
 384  * These call backs are used when the --info option is turned on to print struct
 385  * member information.  For example foo->bar could have a state in
 386  * smatch_extra.c and also check_user.c.
 387  */
 388 void add_member_info_callback(int owner, void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm))
 389 {
 390         struct member_info_callback *member_callback = __alloc_member_info_callback(0);
 391
 392         member_callback->owner = owner;
 393         member_callback->callback = callback;
 394         add_ptr_list(&member_callbacks, member_callback);
 395 }
 396
 397 void add_split_return_callback(void (*fn)(int return_id, char *return_ranges, struct expression *returned_expr))
 398 {
 399         struct returned_state_callback *callback = __alloc_returned_state_callback(0);
 400
 401         callback->callback = fn;
 402         add_ptr_list(&returned_state_callbacks, callback);
 403 }
 404
 405 void add_returned_member_callback(int owner, void (*callback)(int return_id, char *return_ranges, struct expression *expr, char *printed_name, struct smatch_state *state))
 406 {
 407         struct returned_member_callback *member_callback = __alloc_returned_member_callback(0);
 408
 409         member_callback->owner = owner;
 410         member_callback->callback = callback;
 411         add_ptr_list(&returned_member_callbacks, member_callback);
 412 }
 413
 414 void select_call_implies_hook(int type, void (*callback)(struct expression *arg, char *key, char *value))
 415 {
 416         struct call_implies_callback *cb = __alloc_call_implies_callback(0);
 417
 418         cb->type = type;
 419         cb->callback = callback;
 420         add_ptr_list(&call_implies_cb_list, cb);
 421 }
 422
 423 static struct expression *static_call_expr;
 424 static struct expression *static_returns_call;
 425 static struct symbol *return_type;
 426 static struct range_list *return_range_list;
 427 static int db_return_callback(void *unused, int argc, char **argv, char **azColName)
 428 {
 429         struct range_list *rl;
 430         struct expression *call_expr = static_returns_call;
 431
 432         if (argc != 1)
 433                 return 0;
 434         call_results_to_rl(call_expr, return_type, argv[0], &rl);
 435         return_range_list = rl_union(return_range_list, rl);
 436         return 0;
 437 }
 438
 439 struct range_list *db_return_vals(struct expression *expr)
 440 {
 441         char buf[64];
 442         struct sm_state *sm;
 443
 444         if (is_fake_call(expr))
 445                 return NULL;
 446
 447         snprintf(buf, sizeof(buf), "return %p", expr);
 448         sm = get_sm_state(SMATCH_EXTRA, buf, NULL);
 449         if (sm)
 450                 return clone_rl(estate_rl(sm->state));
 451         static_returns_call = expr;
 452         return_type = get_type(expr);
 453         if (!return_type)
 454                 return NULL;
 455
 456         if (expr->fn->type != EXPR_SYMBOL || !expr->fn->symbol)
 457                 return NULL;
 458
 459         return_range_list = NULL;
 460         if (inlinable(expr->fn)) {
 461                 mem_sql(db_return_callback, NULL,
 462                         "select distinct return from return_states where call_id = '%lu';",
 463                         (unsigned long)expr);
 464         } else {
 465                 run_sql(db_return_callback, NULL,
 466                         "select distinct return from return_states where %s;",
 467                         get_static_filter(expr->fn->symbol));
 468         }
 469         return return_range_list;
 470 }
 471
 472 static void match_call_marker(struct expression *expr)
 473 {
 474         /*
 475          * we just want to record something in the database so that if we have
 476          * two calls like:  frob(4); frob(some_unkown); then on the receiving
 477          * side we know that sometimes frob is called with unknown parameters.
 478          */
 479
 480         sql_insert_caller_info(expr, INTERNAL, -1, "%call_marker%", "");
 481 }
 482
 483 static void print_struct_members(struct expression *call, struct expression *expr, int param, struct stree *stree,
 484         void (*callback)(struct expression *call, int param, char *printed_name, struct sm_state *sm))
 485 {
 486         struct symbol *type;
 487         struct sm_state *sm;
 488         char *name;
 489         struct symbol *sym;
 490         int len;
 491         char printed_name[256];
 492         int is_address = 0;
 493
 494         expr = strip_expr(expr);
 495         if (expr->type == EXPR_PREOP && expr->op == '&') {
 496                 expr = strip_expr(expr->unop);
 497                 is_address = 1;
 498         }
 499
 500         type = get_type(expr);
 501         if (type && (type->type != SYM_PTR && type->type != SYM_STRUCT))
 502                 return;
 503
 504         name = expr_to_var_sym(expr, &sym);
 505         if (!name || !sym)
 506                 goto free;
 507
 508         len = strlen(name);
 509         FOR_EACH_SM(stree, sm) {
 510                 if (sm->sym != sym)
 511                         continue;
 512                 if (strcmp(name, sm->name) == 0) {
 513                         if (is_address)
 514                                 snprintf(printed_name, sizeof(printed_name), "*$");
 515                         else /* these are already handled. fixme: handle them here */
 516                                 continue;
 517                 } else if (sm->name[0] == '*' && strcmp(name, sm->name + 1) == 0) {
 518                         snprintf(printed_name, sizeof(printed_name), "*$");
 519                 } else if (strncmp(name, sm->name, len) == 0) {
 520                         if (isalnum(sm->name[len]))
 521                                 continue;
 522                         if (is_address)
 523                                 snprintf(printed_name, sizeof(printed_name), "$->%s", sm->name + len + 1);
 524                         else
 525                                 snprintf(printed_name, sizeof(printed_name), "$%s", sm->name + len);
 526                 } else {
 527                         continue;
 528                 }
 529                 callback(call, param, printed_name, sm);
 530         } END_FOR_EACH_SM(sm);
 531 free:
 532         free_string(name);
 533 }
 534
 535 static void match_call_info(struct expression *call)
 536 {
 537         struct member_info_callback *cb;
 538         struct expression *arg;
 539         struct stree *stree;
 540         char *name;
 541         int i;
 542
 543         name = get_fnptr_name(call->fn);
 544         if (!name)
 545                 return;
 546
 547         FOR_EACH_PTR(member_callbacks, cb) {
 548                 stree = get_all_states_stree(cb->owner);
 549                 i = 0;
 550                 FOR_EACH_PTR(call->args, arg) {
 551                         print_struct_members(call, arg, i, stree, cb->callback);
 552                         i++;
 553                 } END_FOR_EACH_PTR(arg);
 554                 free_stree(&stree);
 555         } END_FOR_EACH_PTR(cb);
 556
 557         free_string(name);
 558 }
 559
 560 static int get_param(int param, char **name, struct symbol **sym)
 561 {
 562         struct symbol *arg;
 563         int i;
 564
 565         i = 0;
 566         FOR_EACH_PTR(cur_func_sym->ctype.base_type->arguments, arg) {
 567                 /*
 568                  * this is a temporary hack to work around a bug (I think in sparse?)
 569                  * 2.6.37-rc1:fs/reiserfs/journal.o
 570                  * If there is a function definition without parameter name found
 571                  * after a function implementation then it causes a crash.
 572                  * int foo() {}
 573                  * int bar(char *);
 574                  */
 575                 if (arg->ident->name < (char *)100)
 576                         continue;
 577                 if (i == param) {
 578                         *name = arg->ident->name;
 579                         *sym = arg;
 580                         return TRUE;
 581                 }
 582                 i++;
 583         } END_FOR_EACH_PTR(arg);
 584
 585         return FALSE;
 586 }
 587
 588 static struct stree *final_states;
 589 static int prev_func_id = -1;
 590 static int caller_info_callback(void *unused, int argc, char **argv, char **azColName)
 591 {
 592         int func_id;
 593         long type;
 594         long param;
 595         char *key;
 596         char *value;
 597         char *name = NULL;
 598         struct symbol *sym = NULL;
 599         struct def_callback *def_callback;
 600         struct stree *stree;
 601
 602         if (argc != 5)
 603                 return 0;
 604
 605         func_id = atoi(argv[0]);
 606         errno = 0;
 607         type = strtol(argv[1], NULL, 10);
 608         param = strtol(argv[2], NULL, 10);
 609         if (errno)
 610                 return 0;
 611         key = argv[3];
 612         value = argv[4];
 613
 614
 615         if (prev_func_id == -1)
 616                 prev_func_id = func_id;
 617         if (func_id != prev_func_id) {
 618                 stree = __pop_fake_cur_stree();
 619                 merge_stree(&final_states, stree);
 620                 free_stree(&stree);
 621                 __push_fake_cur_stree();
 622                 __unnullify_path();
 623                 prev_func_id = func_id;
 624         }
 625
 626         if (param >= 0 && !get_param(param, &name, &sym))
 627                 return 0;
 628
 629         FOR_EACH_PTR(callbacks, def_callback) {
 630                 if (def_callback->hook_type == type)
 631                         def_callback->callback(name, sym, key, value);
 632         } END_FOR_EACH_PTR(def_callback);
 633
 634         return 0;
 635 }
 636
 637 static void get_direct_callers(struct symbol *sym)
 638 {
 639         sql_select_caller_info("call_id, type, parameter, key, value", sym,
 640                         caller_info_callback);
 641 }
 642
 643 static struct string_list *ptr_names_done;
 644 static struct string_list *ptr_names;
 645
 646 static int get_ptr_name(void *unused, int argc, char **argv, char **azColName)
 647 {
 648         insert_string(&ptr_names, alloc_string(argv[0]));
 649         return 0;
 650 }
 651
 652 static char *get_next_ptr_name(void)
 653 {
 654         char *ptr;
 655
 656         FOR_EACH_PTR(ptr_names, ptr) {
 657                 if (list_has_string(ptr_names_done, ptr))
 658                         continue;
 659                 insert_string(&ptr_names_done, ptr);
 660                 return ptr;
 661         } END_FOR_EACH_PTR(ptr);
 662         return NULL;
 663 }
 664
 665 static void get_ptr_names(const char *file, const char *name)
 666 {
 667         char sql_filter[1024];
 668         int before, after;
 669
 670         if (file) {
 671                 snprintf(sql_filter, 1024, "file = '%s' and function = '%s';",
 672                          file, name);
 673         } else {
 674                 snprintf(sql_filter, 1024, "function = '%s';", name);
 675         }
 676
 677         before = ptr_list_size((struct ptr_list *)ptr_names);
 678
 679         run_sql(get_ptr_name, NULL,
 680                 "select distinct ptr from function_ptr where %s",
 681                 sql_filter);
 682
 683         after = ptr_list_size((struct ptr_list *)ptr_names);
 684         if (before == after)
 685                 return;
 686
 687         while ((name = get_next_ptr_name()))
 688                 get_ptr_names(NULL, name);
 689 }
 690
 691 static void match_data_from_db(struct symbol *sym)
 692 {
 693         struct sm_state *sm;
 694         struct stree *stree;
 695
 696         if (!sym || !sym->ident)
 697                 return;
 698
 699         __push_fake_cur_stree();
 700         __unnullify_path();
 701         prev_func_id = -1;
 702
 703         if (!__inline_fn) {
 704                 char *ptr;
 705
 706                 if (sym->ctype.modifiers & MOD_STATIC)
 707                         get_ptr_names(get_base_file(), sym->ident->name);
 708                 else
 709                         get_ptr_names(NULL, sym->ident->name);
 710
 711                 if (ptr_list_size((struct ptr_list *)ptr_names) > 20) {
 712                         __free_ptr_list((struct ptr_list **)&ptr_names);
 713                         __free_ptr_list((struct ptr_list **)&ptr_names_done);
 714                         stree = __pop_fake_cur_stree();
 715                         free_stree(&stree);
 716                         return;
 717                 }
 718
 719                 get_direct_callers(sym);
 720
 721                 FOR_EACH_PTR(ptr_names, ptr) {
 722                         run_sql(caller_info_callback, NULL,
 723                                 "select call_id, type, parameter, key, value"
 724                                 " from caller_info where function = '%s' order by call_id",
 725                                 ptr);
 726                         free_string(ptr);
 727                 } END_FOR_EACH_PTR(ptr);
 728
 729                 __free_ptr_list((struct ptr_list **)&ptr_names);
 730                 __free_ptr_list((struct ptr_list **)&ptr_names_done);
 731         } else {
 732                 get_direct_callers(sym);
 733         }
 734
 735         stree = __pop_fake_cur_stree();
 736         merge_stree(&final_states, stree);
 737         free_stree(&stree);
 738
 739         FOR_EACH_SM(final_states, sm) {
 740                 __set_sm(sm);
 741         } END_FOR_EACH_SM(sm);
 742
 743         free_stree(&final_states);
 744 }
 745
 746 static int call_implies_callbacks(void *unused, int argc, char **argv, char **azColName)
 747 {
 748         struct expression *call_expr = static_call_expr;
 749         struct call_implies_callback *cb;
 750         struct expression *arg = NULL;
 751         int type;
 752         int param;
 753
 754         if (argc != 5)
 755                 return 0;
 756
 757         type = atoi(argv[1]);
 758         param = atoi(argv[2]);
 759
 760         FOR_EACH_PTR(call_implies_cb_list, cb) {
 761                 if (cb->type != type)
 762                         continue;
 763                 if (param != -1) {
 764                         arg = get_argument_from_call_expr(call_expr->args, param);
 765                         if (!arg)
 766                                 continue;
 767                 }
 768                 cb->callback(arg, argv[3], argv[4]);
 769         } END_FOR_EACH_PTR(cb);
 770
 771         return 0;
 772 }
 773
 774 static void match_call_implies(struct expression *expr)
 775 {
 776         static_call_expr = expr;
 777         sql_select_call_implies("function, type, parameter, key, value", expr,
 778                                 call_implies_callbacks);
 779         return;
 780 }
 781
 782 static void print_initializer_list(struct expression_list *expr_list,
 783                 struct symbol *struct_type)
 784 {
 785         struct expression *expr;
 786         struct symbol *base_type;
 787         char struct_name[256];
 788
 789         FOR_EACH_PTR(expr_list, expr) {
 790                 if (expr->type == EXPR_INDEX && expr->idx_expression && expr->idx_expression->type == EXPR_INITIALIZER) {
 791                         print_initializer_list(expr->idx_expression->expr_list, struct_type);
 792                         continue;
 793                 }
 794                 if (expr->type != EXPR_IDENTIFIER)
 795                         continue;
 796                 if (!expr->expr_ident)
 797                         continue;
 798                 if (!expr->ident_expression || !expr->ident_expression->symbol_name)
 799                         continue;
 800                 base_type = get_type(expr->ident_expression);
 801                 if (!base_type || base_type->type != SYM_FN)
 802                         continue;
 803                 snprintf(struct_name, sizeof(struct_name), "(struct %s)->%s",
 804                          struct_type->ident->name, expr->expr_ident->name);
 805                 sql_insert_function_ptr(expr->ident_expression->symbol_name->name,
 806                                         struct_name);
 807         } END_FOR_EACH_PTR(expr);
 808 }
 809
 810 static void global_variable(struct symbol *sym)
 811 {
 812         struct symbol *struct_type;
 813
 814         if (!sym->ident)
 815                 return;
 816         if (!sym->initializer || sym->initializer->type != EXPR_INITIALIZER)
 817                 return;
 818         struct_type = get_base_type(sym);
 819         if (!struct_type)
 820                 return;
 821         if (struct_type->type == SYM_ARRAY) {
 822                 struct_type = get_base_type(struct_type);
 823                 if (!struct_type)
 824                         return;
 825         }
 826         if (struct_type->type != SYM_STRUCT || !struct_type->ident)
 827                 return;
 828         print_initializer_list(sym->initializer->expr_list, struct_type);
 829 }
 830
 831 static void match_return_info(int return_id, char *return_ranges, struct expression *expr)
 832 {
 833         sql_insert_return_states(return_id, return_ranges, INTERNAL, -1, "", "");
 834 }
 835
 836 static void call_return_state_hooks_conditional(struct expression *expr)
 837 {
 838         struct returned_state_callback *cb;
 839         struct range_list *rl;
 840         char *return_ranges;
 841         int final_pass_orig = final_pass;
 842
 843         __push_fake_cur_stree();
 844
 845         final_pass = 0;
 846         __split_whole_condition(expr->conditional);
 847         final_pass = final_pass_orig;
 848
 849         if (get_implied_rl(expr->cond_true, &rl))
 850                 rl = cast_rl(cur_func_return_type(), rl);
 851         else
 852                 rl = cast_rl(cur_func_return_type(), alloc_whole_rl(get_type(expr->cond_true)));
 853         return_ranges = show_rl(rl);
 854
 855         return_id++;
 856         FOR_EACH_PTR(returned_state_callbacks, cb) {
 857                 cb->callback(return_id, return_ranges, expr);
 858         } END_FOR_EACH_PTR(cb);
 859
 860         __push_true_states();
 861         __use_false_states();
 862
 863         if (get_implied_rl(expr->cond_false, &rl))
 864                 rl = cast_rl(cur_func_return_type(), rl);
 865         else
 866                 rl = cast_rl(cur_func_return_type(), alloc_whole_rl(get_type(expr->cond_false)));
 867         return_ranges = show_rl(rl);
 868
 869         return_id++;
 870         FOR_EACH_PTR(returned_state_callbacks, cb) {
 871                 cb->callback(return_id, return_ranges, expr);
 872         } END_FOR_EACH_PTR(cb);
 873
 874         __merge_true_states();
 875         __free_fake_cur_stree();
 876 }
 877
 878 static void call_return_state_hooks_compare(struct expression *expr)
 879 {
 880         struct returned_state_callback *cb;
 881         char *return_ranges;
 882         int final_pass_orig = final_pass;
 883
 884         __push_fake_cur_stree();
 885
 886         final_pass = 0;
 887         __split_whole_condition(expr);
 888         final_pass = final_pass_orig;
 889
 890         return_ranges = alloc_sname("1");
 891
 892         return_id++;
 893         FOR_EACH_PTR(returned_state_callbacks, cb) {
 894                 cb->callback(return_id, return_ranges, expr);
 895         } END_FOR_EACH_PTR(cb);
 896
 897         __push_true_states();
 898         __use_false_states();
 899
 900         return_ranges = alloc_sname("0");;
 901         return_id++;
 902         FOR_EACH_PTR(returned_state_callbacks, cb) {
 903                 cb->callback(return_id, return_ranges, expr);
 904         } END_FOR_EACH_PTR(cb);
 905
 906         __merge_true_states();
 907         __free_fake_cur_stree();
 908 }
 909
 910 static int split_helper(struct sm_state *sm, struct expression *expr)
 911 {
 912         struct returned_state_callback *cb;
 913         struct range_list *rl;
 914         char *return_ranges;
 915         struct sm_state *tmp;
 916         int ret = 0;
 917         int nr_possible, nr_states;
 918         char *compare_str;
 919         char buf[128];
 920         struct stree *orig_stree;
 921         struct sm_state *orig_sm;
 922
 923         if (!sm || !sm->merged)
 924                 return 0;
 925
 926         if (too_many_possible(sm))
 927                 return 0;
 928
 929         /* bail if it gets too complicated */
 930         nr_possible = ptr_list_size((struct ptr_list *)sm->possible);
 931         nr_states = stree_count(__get_cur_stree());
 932         /*
 933          * the main thing option_info because we don't want to print a
 934          * million lines of output.  If someone else, like check_locking.c
 935          * wants this data, then it doesn't cause a slow down to provide it.
 936          */
 937         if (option_info && nr_states * nr_possible >= 2000)
 938                 return 0;
 939
 940         compare_str = expr_lte_to_param(expr, -1);
 941
 942         orig_stree = clone_stree(__get_cur_stree());
 943         FOR_EACH_PTR(sm->possible, tmp) {
 944                 if (tmp->merged)
 945                         continue;
 946
 947                 ret = 1;
 948                 __push_fake_cur_stree();
 949
 950                 FOR_EACH_SM(orig_stree, orig_sm) {
 951                         __set_sm(orig_sm);
 952                 } END_FOR_EACH_SM(orig_sm);
 953
 954                 overwrite_states_using_pool(tmp);
 955
 956                 rl = cast_rl(cur_func_return_type(), estate_rl(tmp->state));
 957                 return_ranges = show_rl(rl);
 958                 if (compare_str) {
 959                         snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
 960                         return_ranges = alloc_sname(buf);
 961                 }
 962
 963                 return_id++;
 964                 FOR_EACH_PTR(returned_state_callbacks, cb) {
 965                         cb->callback(return_id, return_ranges, expr);
 966                 } END_FOR_EACH_PTR(cb);
 967
 968                 __free_fake_cur_stree();
 969         } END_FOR_EACH_PTR(tmp);
 970
 971         free_stree(&orig_stree);
 972         return ret;
 973 }
 974
 975 static const char *get_return_ranges_str(struct expression *expr)
 976 {
 977         struct range_list *rl;
 978         char *return_ranges;
 979         sval_t sval;
 980         char *compare_str;
 981         char *math_str;
 982         char buf[128];
 983
 984         if (!expr)
 985                 return alloc_sname("");
 986
 987         if (get_implied_value(expr, &sval))
 988                 return sval_to_str(sval);
 989
 990         compare_str = expr_equal_to_param(expr, -1);
 991         math_str = get_value_in_terms_of_parameter_math(expr);
 992
 993         if (get_implied_rl(expr, &rl)) {
 994                 rl = cast_rl(cur_func_return_type(), rl);
 995                 return_ranges = show_rl(rl);
 996         } else {
 997                 rl = cast_rl(cur_func_return_type(), alloc_whole_rl(get_type(expr)));
 998                 return_ranges = show_rl(rl);
 999         }
1000
1001         if (compare_str) {
1002                 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1003                 return alloc_sname(buf);
1004         }
1005
1006         if (math_str) {
1007                 snprintf(buf, sizeof(buf), "%s[%s]", return_ranges, math_str);
1008                 return alloc_sname(buf);
1009         }
1010
1011         compare_str = expr_lte_to_param(expr, -1);
1012         if (compare_str) {
1013                 snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1014                 return alloc_sname(buf);
1015         }
1016         return return_ranges;
1017 }
1018
1019 static int split_positive_from_negative(struct expression *expr)
1020 {
1021         struct returned_state_callback *cb;
1022         struct range_list *rl;
1023         const char *return_ranges;
1024         int undo;
1025
1026         /* We're going to print the states 3 times */
1027         if (stree_count(__get_cur_stree()) > 10000 / 3)
1028                 return 0;
1029
1030         if (!get_implied_rl(expr, &rl) || !rl)
1031                 return 0;
1032         if (is_whole_rl(rl) || is_whole_rl_non_zero(rl))
1033                 return 0;
1034         /* Forget about INT_MAX and larger */
1035         if (rl_max(rl).value <= 0)
1036                 return 0;
1037         if (!sval_is_negative(rl_min(rl)))
1038                 return 0;
1039
1040         if (!assume(compare_expression(expr, '>', zero_expr())))
1041                 return 0;
1042
1043         return_id++;
1044         return_ranges = get_return_ranges_str(expr);
1045         FOR_EACH_PTR(returned_state_callbacks, cb) {
1046                 cb->callback(return_id, (char *)return_ranges, expr);
1047         } END_FOR_EACH_PTR(cb);
1048
1049         end_assume();
1050
1051         if (rl_has_sval(rl, sval_type_val(rl_type(rl), 0))) {
1052                 undo = assume(compare_expression(expr, SPECIAL_EQUAL, zero_expr()));
1053
1054                 return_id++;
1055                 return_ranges = get_return_ranges_str(expr);
1056                 FOR_EACH_PTR(returned_state_callbacks, cb) {
1057                         cb->callback(return_id, (char *)return_ranges, expr);
1058                 } END_FOR_EACH_PTR(cb);
1059
1060                 if (undo)
1061                         end_assume();
1062         }
1063
1064         undo = assume(compare_expression(expr, '<', zero_expr()));
1065
1066         return_id++;
1067         return_ranges = get_return_ranges_str(expr);
1068         FOR_EACH_PTR(returned_state_callbacks, cb) {
1069                 cb->callback(return_id, (char *)return_ranges, expr);
1070         } END_FOR_EACH_PTR(cb);
1071
1072         if (undo)
1073                 end_assume();
1074
1075         return 1;
1076 }
1077
1078 static int call_return_state_hooks_split_possible(struct expression *expr)
1079 {
1080         struct returned_state_callback *cb;
1081         struct range_list *rl;
1082         char *return_ranges;
1083         struct sm_state *sm;
1084         struct sm_state *tmp;
1085         int ret = 0;
1086         int nr_possible, nr_states;
1087         char *compare_str;
1088         char buf[128];
1089
1090         if (!expr || expr_equal_to_param(expr, -1))
1091                 return 0;
1092
1093         sm = get_sm_state_expr(SMATCH_EXTRA, expr);
1094         if (!sm || !sm->merged)
1095                 return 0;
1096
1097         if (too_many_possible(sm))
1098                 return 0;
1099
1100         /* bail if it gets too complicated */
1101         nr_possible = ptr_list_size((struct ptr_list *)sm->possible);
1102         nr_states = stree_count(__get_cur_stree());
1103         /*
1104          * the main thing option_info because we don't want to print a
1105          * million lines of output.  If someone else, like check_locking.c
1106          * wants this data, then it doesn't cause a slow down to provide it.
1107          */
1108         if (option_info && nr_states * nr_possible >= 2000)
1109                 return 0;
1110
1111
1112         FOR_EACH_PTR(sm->possible, tmp) {
1113                 if (tmp->merged)
1114                         continue;
1115
1116                 ret = 1;
1117                 __push_fake_cur_stree();
1118
1119                 overwrite_states_using_pool(tmp);
1120
1121                 if (split_positive_from_negative(expr)) {
1122                         __free_fake_cur_stree();
1123                         continue;
1124                 }
1125                 rl = cast_rl(cur_func_return_type(), estate_rl(tmp->state));
1126                 return_ranges = show_rl(rl);
1127
1128                 compare_str = expr_lte_to_param(expr, -1);
1129                 if (compare_str) {
1130                         snprintf(buf, sizeof(buf), "%s%s", return_ranges, compare_str);
1131                         return_ranges = alloc_sname(buf);
1132                 }
1133
1134                 return_id++;
1135                 FOR_EACH_PTR(returned_state_callbacks, cb) {
1136                         cb->callback(return_id, return_ranges, expr);
1137                 } END_FOR_EACH_PTR(cb);
1138
1139                 __free_fake_cur_stree();
1140         } END_FOR_EACH_PTR(tmp);
1141
1142         return ret;
1143 }
1144
1145 static int call_return_state_hooks_split_success_fail(struct expression *expr)
1146 {
1147         struct range_list *rl;
1148         int nr_states;
1149         struct returned_state_callback *cb;
1150         char *return_ranges;
1151         int final_pass_orig = final_pass;
1152         sval_t val;
1153
1154         if (option_project != PROJ_KERNEL)
1155                 return 0;
1156
1157         nr_states = stree_count(__get_cur_stree());
1158         if (nr_states > 1500)
1159                 return 0;
1160
1161         if (get_value(expr, &val))
1162                 return 0;
1163         if (!get_implied_rl(expr, &rl))
1164                 return 0;
1165         if (rl_min(rl).value < -4095 || rl_min(rl).value >= 0)
1166                 return 0;
1167         if (rl_max(rl).value != 0)
1168                 return 0;
1169
1170         __push_fake_cur_stree();
1171
1172         final_pass = 0;
1173         __split_whole_condition(expr);
1174         final_pass = final_pass_orig;
1175
1176         return_ranges = show_rl(rl_filter(rl, rl_zero()));
1177
1178         return_id++;
1179         FOR_EACH_PTR(returned_state_callbacks, cb) {
1180                 cb->callback(return_id, return_ranges, expr);
1181         } END_FOR_EACH_PTR(cb);
1182
1183         __push_true_states();
1184         __use_false_states();
1185
1186         return_ranges = alloc_sname("0");;
1187         return_id++;
1188         FOR_EACH_PTR(returned_state_callbacks, cb) {
1189                 cb->callback(return_id, return_ranges, expr);
1190         } END_FOR_EACH_PTR(cb);
1191
1192         __merge_true_states();
1193         __free_fake_cur_stree();
1194
1195         return 1;
1196 }
1197
1198 static int is_boolean(struct expression *expr)
1199 {
1200         struct range_list *rl;
1201
1202         if (!get_implied_rl(expr, &rl))
1203                 return 0;
1204         if (rl_min(rl).value == 0 && rl_max(rl).value == 1)
1205                 return 1;
1206         return 0;
1207 }
1208
1209 static int is_conditional(struct expression *expr)
1210 {
1211         if (!expr)
1212                 return 0;
1213         if (expr->type == EXPR_CONDITIONAL || expr->type == EXPR_SELECT)
1214                 return 1;
1215         return 0;
1216 }
1217
1218 static int splitable_function_call(struct expression *expr)
1219 {
1220         struct sm_state *sm;
1221         char buf[64];
1222
1223         if (!expr || expr->type != EXPR_CALL)
1224                 return 0;
1225         snprintf(buf, sizeof(buf), "return %p", expr);
1226         sm = get_sm_state(SMATCH_EXTRA, buf, NULL);
1227         return split_helper(sm, expr);
1228 }
1229
1230 static void call_return_state_hooks(struct expression *expr)
1231 {
1232         struct returned_state_callback *cb;
1233         const char *return_ranges;
1234         int nr_states;
1235         sval_t sval;
1236
1237         expr = strip_expr(expr);
1238
1239         if (is_impossible_path())
1240                 goto vanilla;
1241
1242         if (!get_implied_value(expr, &sval) &&
1243             (is_condition(expr) || is_boolean(expr))) {
1244                 call_return_state_hooks_compare(expr);
1245                 return;
1246         } else if (is_conditional(expr)) {
1247                 call_return_state_hooks_conditional(expr);
1248                 return;
1249         } else if (call_return_state_hooks_split_possible(expr)) {
1250                 return;
1251         } else if (call_return_state_hooks_split_success_fail(expr)) {
1252                 return;
1253         } else if (splitable_function_call(expr)) {
1254                 return;
1255         } else if (split_positive_from_negative(expr)) {
1256                 return;
1257         }
1258
1259 vanilla:
1260         return_ranges = get_return_ranges_str(expr);
1261
1262         return_id++;
1263         nr_states = stree_count(__get_cur_stree());
1264         if (nr_states >= 10000) {
1265                 match_return_info(return_id, (char *)return_ranges, expr);
1266                 return;
1267         }
1268         FOR_EACH_PTR(returned_state_callbacks, cb) {
1269                 cb->callback(return_id, (char *)return_ranges, expr);
1270         } END_FOR_EACH_PTR(cb);
1271 }
1272
1273 static void print_returned_struct_members(int return_id, char *return_ranges, struct expression *expr)
1274 {
1275         struct returned_member_callback *cb;
1276         struct stree *stree;
1277         struct sm_state *sm;
1278         struct symbol *type;
1279         char *name;
1280         char member_name[256];
1281         int len;
1282
1283         type = get_type(expr);
1284         if (!type || type->type != SYM_PTR)
1285                 return;
1286         name = expr_to_var(expr);
1287         if (!name)
1288                 return;
1289
1290         member_name[sizeof(member_name) - 1] = '\0';
1291         strcpy(member_name, "$");
1292
1293         len = strlen(name);
1294         FOR_EACH_PTR(returned_member_callbacks, cb) {
1295                 stree = __get_cur_stree();
1296                 FOR_EACH_MY_SM(cb->owner, stree, sm) {
1297                         if (sm->name[0] == '*' && strcmp(sm->name + 1, name) == 0) {
1298                                 strcpy(member_name, "*$");
1299                                 cb->callback(return_id, return_ranges, expr, member_name, sm->state);
1300                                 continue;
1301                         }
1302                         if (strncmp(sm->name, name, len) != 0)
1303                                 continue;
1304                         if (strncmp(sm->name + len, "->", 2) != 0)
1305                                 continue;
1306                         snprintf(member_name, sizeof(member_name), "$%s", sm->name + len);
1307                         cb->callback(return_id, return_ranges, expr, member_name, sm->state);
1308                 } END_FOR_EACH_SM(sm);
1309         } END_FOR_EACH_PTR(cb);
1310
1311         free_string(name);
1312 }
1313
1314 static void reset_memdb(void)
1315 {
1316         mem_sql(NULL, NULL, "delete from caller_info;");
1317         mem_sql(NULL, NULL, "delete from return_states;");
1318         mem_sql(NULL, NULL, "delete from call_implies;");
1319 }
1320
1321 static void match_end_func_info(struct symbol *sym)
1322 {
1323         if (__path_is_null())
1324                 return;
1325         call_return_state_hooks(NULL);
1326         if (!__inline_fn)
1327                 reset_memdb();
1328 }
1329
1330 static void init_memdb(void)
1331 {
1332         char *err = NULL;
1333         int rc;
1334         const char *schema_files[] = {
1335                 "db/db.schema",
1336                 "db/caller_info.schema",
1337                 "db/return_states.schema",
1338                 "db/function_type_size.schema",
1339                 "db/type_size.schema",
1340                 "db/call_implies.schema",
1341                 "db/function_ptr.schema",
1342                 "db/local_values.schema",
1343                 "db/function_type_value.schema",
1344                 "db/type_value.schema",
1345                 "db/function_type_info.schema",
1346                 "db/data_info.schema",
1347         };
1348         static char buf[4096];
1349         int fd;
1350         int ret;
1351         int i;
1352
1353         rc = sqlite3_open(":memory:", &mem_db);
1354         if (rc != SQLITE_OK) {
1355                 printf("Error starting In-Memory database.");
1356                 return;
1357         }
1358
1359         for (i = 0; i < ARRAY_SIZE(schema_files); i++) {
1360                 fd = open_data_file(schema_files[i]);
1361                 if (fd < 0) {
1362                         mem_db = NULL;
1363                         return;
1364                 }
1365                 ret = read(fd, buf, sizeof(buf));
1366                 if (ret == sizeof(buf)) {
1367                         printf("Schema file too large:  %s (limit %zd bytes)",
1368                                schema_files[i], sizeof(buf));
1369                 }
1370                 buf[ret] = '\0';
1371                 rc = sqlite3_exec(mem_db, buf, NULL, 0, &err);
1372                 if (rc != SQLITE_OK) {
1373                         fprintf(stderr, "SQL error #2: %s\n", err);
1374                         fprintf(stderr, "%s\n", buf);
1375                 }
1376         }
1377 }
1378
1379 void open_smatch_db(void)
1380 {
1381         int rc;
1382
1383         if (option_no_db)
1384                 return;
1385
1386         init_memdb();
1387
1388         rc = sqlite3_open_v2("smatch_db.sqlite", &db, SQLITE_OPEN_READONLY, NULL);
1389         if (rc != SQLITE_OK) {
1390                 option_no_db = 1;
1391                 return;
1392         }
1393         return;
1394 }
1395
1396 static void register_common_funcs(void)
1397 {
1398         struct token *token;
1399         char *func;
1400         char filename[256];
1401
1402         if (option_project == PROJ_NONE)
1403                 strcpy(filename, "common_functions");
1404         else
1405                 snprintf(filename, 256, "%s.common_functions", option_project_str);
1406
1407         token = get_tokens_file(filename);
1408         if (!token)
1409                 return;
1410         if (token_type(token) != TOKEN_STREAMBEGIN)
1411                 return;
1412         token = token->next;
1413         while (token_type(token) != TOKEN_STREAMEND) {
1414                 if (token_type(token) != TOKEN_IDENT)
1415                         return;
1416                 func = alloc_string(show_ident(token->ident));
1417                 add_ptr_list(&common_funcs, func);
1418                 token = token->next;
1419         }
1420         clear_token_alloc();
1421 }
1422
1423
1424 void register_definition_db_callbacks(int id)
1425 {
1426         add_hook(&match_call_info, FUNCTION_CALL_HOOK);
1427         add_hook(&global_variable, BASE_HOOK);
1428         add_hook(&global_variable, DECLARATION_HOOK);
1429         add_split_return_callback(match_return_info);
1430         add_split_return_callback(print_returned_struct_members);
1431         add_hook(&call_return_state_hooks, RETURN_HOOK);
1432         add_hook(&match_end_func_info, END_FUNC_HOOK);
1433
1434         add_hook(&match_data_from_db, FUNC_DEF_HOOK);
1435         add_hook(&match_call_implies, CALL_HOOK_AFTER_INLINE);
1436
1437         register_common_funcs();
1438 }
1439
1440 void register_db_call_marker(int id)
1441 {
1442         add_hook(&match_call_marker, FUNCTION_CALL_HOOK);
1443 }
1444
1445 char *return_state_to_var_sym(struct expression *expr, int param, char *key, struct symbol **sym)
1446 {
1447         struct expression *arg;
1448         char *name = NULL;
1449         char member_name[256];
1450
1451         *sym = NULL;
1452
1453         if (param == -1) {
1454                 const char *star = "";
1455
1456                 if (expr->type != EXPR_ASSIGNMENT)
1457                         return NULL;
1458                 name = expr_to_var_sym(expr->left, sym);
1459                 if (!name)
1460                         return NULL;
1461                 if (key[0] == '*') {
1462                         star = "*";
1463                         key++;
1464                 }
1465                 if (strncmp(key, "$", 1) != 0)
1466                         return name;
1467                 snprintf(member_name, sizeof(member_name), "%s%s%s", star, name, key + 1);
1468                 free_string(name);
1469                 return alloc_string(member_name);
1470         }
1471
1472         while (expr->type == EXPR_ASSIGNMENT)
1473                 expr = strip_expr(expr->right);
1474         if (expr->type != EXPR_CALL)
1475                 return NULL;
1476
1477         arg = get_argument_from_call_expr(expr->args, param);
1478         if (!arg)
1479                 return NULL;
1480
1481         return get_variable_from_key(arg, key, sym);
1482 }
1483
1484 char *get_variable_from_key(struct expression *arg, char *key, struct symbol **sym)
1485 {
1486         char buf[256];
1487         char *tmp;
1488
1489         if (!arg)
1490                 return NULL;
1491
1492         arg = strip_expr(arg);
1493
1494         if (strcmp(key, "$") == 0)
1495                 return expr_to_var_sym(arg, sym);
1496
1497         if (strcmp(key, "*$") == 0) {
1498                 if (arg->type == EXPR_PREOP && arg->op == '&') {
1499                         arg = strip_expr(arg->unop);
1500                         return expr_to_var_sym(arg, sym);
1501                 } else {
1502                         tmp = expr_to_var_sym(arg, sym);
1503                         if (!tmp)
1504                                 return NULL;
1505                         snprintf(buf, sizeof(buf), "*%s", tmp);
1506                         free_string(tmp);
1507                         return alloc_string(buf);
1508                 }
1509         }
1510
1511         if (arg->type == EXPR_PREOP && arg->op == '&') {
1512                 arg = strip_expr(arg->unop);
1513                 tmp = expr_to_var_sym(arg, sym);
1514                 if (!tmp)
1515                         return NULL;
1516                 snprintf(buf, sizeof(buf), "%s.%s", tmp, key + 3);
1517                 return alloc_string(buf);
1518         }
1519
1520         tmp = expr_to_var_sym(arg, sym);
1521         if (!tmp)
1522                 return NULL;
1523         snprintf(buf, sizeof(buf), "%s%s", tmp, key + 1);
1524         free_string(tmp);
1525         return alloc_string(buf);
1526 }
1527
1528 const char *get_param_name(struct sm_state *sm)
1529 {
1530         char *param_name;
1531         int name_len;
1532         static char buf[256];
1533
1534         if (!sm->sym || !sm->sym->ident)
1535                 return NULL;
1536
1537         param_name = sm->sym->ident->name;
1538         name_len = strlen(param_name);
1539
1540         if (strcmp(sm->name, param_name) == 0) {
1541                 return "$";
1542         } else if (sm->name[name_len] == '-' && /* check for '-' from "->" */
1543             strncmp(sm->name, param_name, name_len) == 0) {
1544                 snprintf(buf, sizeof(buf), "$%s", sm->name + name_len);
1545                 return buf;
1546         } else if (sm->name[0] == '*' && strcmp(sm->name + 1, param_name) == 0) {
1547                 return "*$";
1548         }
1549         return NULL;
1550 }
1551
1552 char *get_data_info_name(struct expression *expr)
1553 {
1554         struct symbol *sym;
1555         char *name;
1556         char buf[256];
1557         char *ret = NULL;
1558
1559         expr = strip_expr(expr);
1560         name = get_member_name(expr);
1561         if (name)
1562                 return name;
1563         name = expr_to_var_sym(expr, &sym);
1564         if (!name || !sym)
1565                 goto free;
1566         if (!(sym->ctype.modifiers & MOD_TOPLEVEL))
1567                 goto free;
1568         if (sym->ctype.modifiers & MOD_STATIC)
1569                 snprintf(buf, sizeof(buf), "static %s", name);
1570         else
1571                 snprintf(buf, sizeof(buf), "global %s", name);
1572         ret = alloc_sname(buf);
1573 free:
1574         free_string(name);
1575         return ret;
1576 }