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