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