smatch_buf_size.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 <stdlib.h>
  19 #include <errno.h>
  20 #include "parse.h"
  21 #include "smatch.h"
  22 #include "smatch_slist.h"
  23 #include "smatch_extra.h"
  24 #include "smatch_function_hashtable.h"
  25
  26 #define UNKNOWN_SIZE (-1)
  27
  28 static int my_size_id;
  29
  30 static DEFINE_HASHTABLE_INSERT(insert_func, char, int);
  31 static DEFINE_HASHTABLE_SEARCH(search_func, char, int);
  32 static struct hashtable *allocation_funcs;
  33
  34 static char *get_fn_name(struct expression *expr)
  35 {
  36         if (expr->type != EXPR_CALL)
  37                 return NULL;
  38         if (expr->fn->type != EXPR_SYMBOL)
  39                 return NULL;
  40         return expr_to_var(expr->fn);
  41 }
  42
  43 static int is_allocation_function(struct expression *expr)
  44 {
  45         char *func;
  46         int ret = 0;
  47
  48         func = get_fn_name(expr);
  49         if (!func)
  50                 return 0;
  51         if (search_func(allocation_funcs, func))
  52                 ret = 1;
  53         free_string(func);
  54         return ret;
  55 }
  56
  57 static void add_allocation_function(const char *func, void *call_back, int param)
  58 {
  59         insert_func(allocation_funcs, (char *)func, (int *)1);
  60         add_function_assign_hook(func, call_back, INT_PTR(param));
  61 }
  62
  63 static int estate_to_size(struct smatch_state *state)
  64 {
  65         sval_t sval;
  66
  67         if (!state || !estate_rl(state))
  68                 return 0;
  69         sval = estate_max(state);
  70         return sval.value;
  71 }
  72
  73 static struct smatch_state *size_to_estate(int size)
  74 {
  75         sval_t sval;
  76
  77         sval.type = &int_ctype;
  78         sval.value = size;
  79
  80         return alloc_estate_sval(sval);
  81 }
  82
  83 static struct range_list *size_to_rl(int size)
  84 {
  85         sval_t sval;
  86
  87         sval.type = &int_ctype;
  88         sval.value = size;
  89
  90         return alloc_rl(sval, sval);
  91 }
  92
  93 static struct smatch_state *unmatched_size_state(struct sm_state *sm)
  94 {
  95         return size_to_estate(UNKNOWN_SIZE);
  96 }
  97
  98 static void set_size_undefined(struct sm_state *sm, struct expression *mod_expr)
  99 {
 100         set_state(sm->owner, sm->name, sm->sym, size_to_estate(UNKNOWN_SIZE));
 101 }
 102
 103 static struct smatch_state *merge_size_func(struct smatch_state *s1, struct smatch_state *s2)
 104 {
 105         return merge_estates(s1, s2);
 106 }
 107
 108 void set_param_buf_size(const char *name, struct symbol *sym, char *key, char *value)
 109 {
 110         struct range_list *rl = NULL;
 111         struct smatch_state *state;
 112         char fullname[256];
 113
 114         if (strncmp(key, "$", 1) != 0)
 115                 return;
 116
 117         snprintf(fullname, 256, "%s%s", name, key + 1);
 118
 119         str_to_rl(&int_ctype, value, &rl);
 120         if (!rl || is_whole_rl(rl))
 121                 return;
 122         state = alloc_estate_rl(rl);
 123         set_state(my_size_id, fullname, sym, state);
 124 }
 125
 126 static int bytes_per_element(struct expression *expr)
 127 {
 128         struct symbol *type;
 129
 130         if (!expr)
 131                 return 0;
 132         if (expr->type == EXPR_STRING)
 133                 return 1;
 134         if (expr->type == EXPR_PREOP && expr->op == '&') {
 135                 type = get_type(expr->unop);
 136                 if (type && type->type == SYM_ARRAY)
 137                         expr = expr->unop;
 138         }
 139         type = get_type(expr);
 140         if (!type)
 141                 return 0;
 142
 143         if (type->type != SYM_PTR && type->type != SYM_ARRAY)
 144                 return 0;
 145
 146         type = get_base_type(type);
 147         return type_bytes(type);
 148 }
 149
 150 static int bytes_to_elements(struct expression *expr, int bytes)
 151 {
 152         int bpe;
 153
 154         bpe = bytes_per_element(expr);
 155         if (bpe == 0)
 156                 return 0;
 157         return bytes / bpe;
 158 }
 159
 160 static int elements_to_bytes(struct expression *expr, int elements)
 161 {
 162         int bpe;
 163
 164         bpe = bytes_per_element(expr);
 165         return elements * bpe;
 166 }
 167
 168 static int get_initializer_size(struct expression *expr)
 169 {
 170         switch (expr->type) {
 171         case EXPR_STRING:
 172                 return expr->string->length;
 173         case EXPR_INITIALIZER: {
 174                 struct expression *tmp;
 175                 int i = 0;
 176
 177                 FOR_EACH_PTR(expr->expr_list, tmp) {
 178                         if (tmp->type == EXPR_INDEX) {
 179                                 if (tmp->idx_to >= i)
 180                                         i = tmp->idx_to;
 181                                 else
 182                                         continue;
 183                         }
 184
 185                         i++;
 186                 } END_FOR_EACH_PTR(tmp);
 187                 return i;
 188         }
 189         case EXPR_SYMBOL:
 190                 return get_array_size(expr);
 191         }
 192         return 0;
 193 }
 194
 195 static struct range_list *db_size_rl;
 196 static int db_size_callback(void *unused, int argc, char **argv, char **azColName)
 197 {
 198         struct range_list *tmp = NULL;
 199
 200         if (!db_size_rl) {
 201                 str_to_rl(&int_ctype, argv[0], &db_size_rl);
 202         } else {
 203                 str_to_rl(&int_ctype, argv[0], &tmp);
 204                 db_size_rl = rl_union(db_size_rl, tmp);
 205         }
 206         return 0;
 207 }
 208
 209 static struct range_list *size_from_db_type(struct expression *expr)
 210 {
 211         int this_file_only = 0;
 212         char *name;
 213
 214         name = get_member_name(expr);
 215         if (!name && is_static(expr)) {
 216                 name = expr_to_var(expr);
 217                 this_file_only = 1;
 218         }
 219         if (!name)
 220                 return NULL;
 221
 222         if (this_file_only) {
 223                 db_size_rl = NULL;
 224                 run_sql(db_size_callback, NULL,
 225                         "select size from function_type_size where type = '%s' and file = '%s';",
 226                         name, get_filename());
 227                 if (db_size_rl)
 228                         return db_size_rl;
 229                 return NULL;
 230         }
 231
 232         db_size_rl = NULL;
 233         run_sql(db_size_callback, NULL,
 234                 "select size from type_size where type = '%s';",
 235                 name);
 236         return db_size_rl;
 237 }
 238
 239 static struct range_list *size_from_db_symbol(struct expression *expr)
 240 {
 241         struct symbol *sym;
 242
 243         if (expr->type != EXPR_SYMBOL)
 244                 return NULL;
 245         sym = expr->symbol;
 246         if (!sym->ident ||
 247             !(sym->ctype.modifiers & MOD_TOPLEVEL) ||
 248             sym->ctype.modifiers & MOD_STATIC)
 249                 return NULL;
 250
 251         db_size_rl = NULL;
 252         run_sql(db_size_callback, NULL,
 253                 "select value from data_info where file = 'extern' and data = '%s' and type = %d;",
 254                 sym->ident->name, BUF_SIZE);
 255         return db_size_rl;
 256 }
 257
 258 static struct range_list *size_from_db(struct expression *expr)
 259 {
 260         struct range_list *rl;
 261
 262         rl = size_from_db_symbol(expr);
 263         if (rl)
 264                 return rl;
 265         return size_from_db_type(expr);
 266 }
 267
 268 static void db_returns_buf_size(struct expression *expr, int param, char *unused, char *math)
 269 {
 270         struct expression *call;
 271         struct range_list *rl;
 272
 273         if (expr->type != EXPR_ASSIGNMENT)
 274                 return;
 275         call = strip_expr(expr->right);
 276
 277         if (!parse_call_math_rl(call, math, &rl))
 278                 return;
 279         rl = cast_rl(&int_ctype, rl);
 280         set_state_expr(my_size_id, expr->left, alloc_estate_rl(rl));
 281 }
 282
 283 static int get_real_array_size_from_type(struct symbol *type)
 284 {
 285         sval_t sval;
 286
 287         if (!type)
 288                 return 0;
 289         if (!type || type->type != SYM_ARRAY)
 290                 return 0;
 291
 292         if (!get_implied_value(type->array_size, &sval))
 293                 return 0;
 294
 295         /* People put one element arrays on the end of structs */
 296         if (sval.value == 1)
 297                 return 0;
 298
 299         return sval.value;
 300 }
 301
 302 int get_real_array_size(struct expression *expr)
 303 {
 304         if (!expr)
 305                 return 0;
 306         if (expr->type == EXPR_PREOP && expr->op == '&')
 307                 expr = expr->unop;
 308         if (expr->type == EXPR_BINOP) /* array elements foo[5] */
 309                 return 0;
 310         return get_real_array_size_from_type(get_type(expr));
 311 }
 312
 313 static int get_size_from_initializer(struct expression *expr)
 314 {
 315         if (expr->type != EXPR_SYMBOL || !expr->symbol || !expr->symbol->initializer)
 316                 return 0;
 317         if (expr->symbol->initializer == expr) /* int a = a; */
 318                 return 0;
 319         return get_initializer_size(expr->symbol->initializer);
 320 }
 321
 322 static struct range_list *get_stored_size_bytes(struct expression *expr)
 323 {
 324         struct smatch_state *state;
 325
 326         state = get_state_expr(my_size_id, expr);
 327         if (!state)
 328                 return NULL;
 329         return estate_rl(state);
 330 }
 331
 332 static int get_bytes_from_address(struct expression *expr)
 333 {
 334         struct symbol *type;
 335         int ret;
 336
 337         if (!option_spammy)
 338                 return 0;
 339         if (expr->type != EXPR_PREOP || expr->op != '&')
 340                 return 0;
 341         type = get_type(expr);
 342         if (!type)
 343                 return 0;
 344
 345         if (type->type == SYM_PTR)
 346                 type = get_base_type(type);
 347
 348         ret = type_bytes(type);
 349         if (ret == 1)
 350                 return 0;  /* ignore char pointers */
 351
 352         return ret;
 353 }
 354
 355 static struct expression *remove_addr_fluff(struct expression *expr)
 356 {
 357         struct expression *tmp;
 358         sval_t sval;
 359
 360         expr = strip_expr(expr);
 361
 362         /* remove '&' and '*' operations that cancel */
 363         while (expr && expr->type == EXPR_PREOP && expr->op == '&') {
 364                 tmp = strip_expr(expr->unop);
 365                 if (tmp->type != EXPR_PREOP)
 366                         break;
 367                 if (tmp->op != '*')
 368                         break;
 369                 expr = strip_expr(tmp->unop);
 370         }
 371
 372         if (!expr)
 373                 return NULL;
 374
 375         /* "foo + 0" is just "foo" */
 376         if (expr->type == EXPR_BINOP && expr->op == '+' &&
 377             get_value(expr->right, &sval) && sval.value == 0)
 378                 return expr->left;
 379
 380         return expr;
 381 }
 382
 383 static int is_last_member_of_struct(struct symbol *sym, struct ident *member)
 384 {
 385         struct symbol *tmp;
 386         int i;
 387
 388         i = 0;
 389         FOR_EACH_PTR_REVERSE(sym->symbol_list, tmp) {
 390                 if (i++ || !tmp->ident)
 391                         return 0;
 392                 if (tmp->ident == member)
 393                         return 1;
 394                 return 0;
 395         } END_FOR_EACH_PTR_REVERSE(tmp);
 396
 397         return 0;
 398 }
 399
 400 static int last_member_is_resizable(struct symbol *sym)
 401 {
 402         struct symbol *last_member;
 403         struct symbol *type;
 404         sval_t sval;
 405
 406         last_member = last_ptr_list((struct ptr_list *)sym->symbol_list);
 407         if (!last_member || !last_member->ident)
 408                 return 0;
 409
 410         type = get_real_base_type(last_member);
 411         if (type->type == SYM_STRUCT)
 412                 return last_member_is_resizable(type);
 413         if (type->type != SYM_ARRAY)
 414                 return 0;
 415
 416         if (!get_implied_value(type->array_size, &sval))
 417                 return 0;
 418
 419         if (sval.value != 0 && sval.value != 1)
 420                 return 0;
 421
 422         return 1;
 423 }
 424
 425 static int get_stored_size_end_struct_bytes(struct expression *expr)
 426 {
 427         struct symbol *sym;
 428         struct symbol *base_sym;
 429         struct smatch_state *state;
 430
 431         if (expr->type == EXPR_BINOP) /* array elements foo[5] */
 432                 return 0;
 433
 434         if (expr->type == EXPR_PREOP && expr->op == '&')
 435                 expr = strip_parens(expr->unop);
 436
 437         sym = expr_to_sym(expr);
 438         if (!sym || !sym->ident)
 439                 return 0;
 440         if (!type_bytes(sym))
 441                 return 0;
 442         if (sym->type != SYM_NODE)
 443                 return 0;
 444
 445         base_sym = get_real_base_type(sym);
 446         if (!base_sym || base_sym->type != SYM_PTR)
 447                 return 0;
 448         base_sym = get_real_base_type(base_sym);
 449         if (!base_sym || base_sym->type != SYM_STRUCT)
 450                 return 0;
 451
 452         if (!is_last_member_of_struct(base_sym, expr->member))
 453                 return 0;
 454         if (!last_member_is_resizable(base_sym))
 455                 return 0;
 456
 457         state = get_state(my_size_id, sym->ident->name, sym);
 458         if (!estate_to_size(state))
 459                 return 0;
 460
 461         return estate_to_size(state) - type_bytes(base_sym) + type_bytes(get_type(expr));
 462 }
 463
 464 static struct range_list *alloc_int_rl(int value)
 465 {
 466         sval_t sval = {
 467                 .type = &int_ctype,
 468                 {.value = value},
 469         };
 470
 471         return alloc_rl(sval, sval);
 472 }
 473
 474 struct range_list *get_array_size_bytes_rl(struct expression *expr)
 475 {
 476         struct range_list *ret = NULL;
 477         int size;
 478
 479         expr = remove_addr_fluff(expr);
 480         if (!expr)
 481                 return NULL;
 482
 483         /* "BAR" */
 484         if (expr->type == EXPR_STRING)
 485                 return alloc_int_rl(expr->string->length);
 486
 487         if (expr->type == EXPR_BINOP && expr->op == '+') {
 488                 sval_t offset;
 489                 struct symbol *type;
 490                 int bytes;
 491
 492                 if (!get_implied_value(expr->right, &offset))
 493                         return NULL;
 494                 type = get_type(expr->left);
 495                 if (!type)
 496                         return NULL;
 497                 if (type->type != SYM_ARRAY && type->type != SYM_PTR)
 498                         return NULL;
 499                 type = get_real_base_type(type);
 500                 bytes = type_bytes(type);
 501                 if (bytes == 0)
 502                         return NULL;
 503                 offset.value *= bytes;
 504                 size = get_array_size_bytes(expr->left);
 505                 if (size <= 0)
 506                         return NULL;
 507                 return alloc_int_rl(size - offset.value);
 508         }
 509
 510         /* buf[4] */
 511         size = get_real_array_size(expr);
 512         if (size)
 513                 return alloc_int_rl(elements_to_bytes(expr, size));
 514
 515         /* buf = malloc(1024); */
 516         ret = get_stored_size_bytes(expr);
 517         if (ret)
 518                 return ret;
 519
 520         size = get_stored_size_end_struct_bytes(expr);
 521         if (size)
 522                 return alloc_int_rl(size);
 523
 524         /* char *foo = "BAR" */
 525         size = get_size_from_initializer(expr);
 526         if (size)
 527                 return alloc_int_rl(elements_to_bytes(expr, size));
 528
 529         size = get_bytes_from_address(expr);
 530         if (size)
 531                 return alloc_int_rl(size);
 532
 533         ret = size_from_db(expr);
 534         if (ret)
 535                 return ret;
 536
 537         return NULL;
 538 }
 539
 540 int get_array_size_bytes(struct expression *expr)
 541 {
 542         struct range_list *rl;
 543         sval_t sval;
 544
 545         rl = get_array_size_bytes_rl(expr);
 546         if (!rl_to_sval(rl, &sval))
 547                 return 0;
 548         if (sval.uvalue >= INT_MAX)
 549                 return 0;
 550         return sval.value;
 551 }
 552
 553 int get_array_size_bytes_max(struct expression *expr)
 554 {
 555         struct range_list *rl;
 556         sval_t bytes;
 557
 558         rl = get_array_size_bytes_rl(expr);
 559         if (!rl)
 560                 return 0;
 561         bytes = rl_min(rl);
 562         if (bytes.value < 0)
 563                 return 0;
 564         bytes = rl_max(rl);
 565         if (bytes.uvalue >= INT_MAX)
 566                 return 0;
 567         return bytes.value;
 568 }
 569
 570 int get_array_size_bytes_min(struct expression *expr)
 571 {
 572         struct range_list *rl;
 573         struct data_range *range;
 574
 575         rl = get_array_size_bytes_rl(expr);
 576         if (!rl)
 577                 return 0;
 578
 579         FOR_EACH_PTR(rl, range) {
 580                 if (range->min.value <= 0)
 581                         return 0;
 582                 if (range->max.value <= 0)
 583                         return 0;
 584                 if (range->min.uvalue >= INT_MAX)
 585                         return 0;
 586                 return range->min.value;
 587         } END_FOR_EACH_PTR(range);
 588
 589         return 0;
 590 }
 591
 592 int get_array_size(struct expression *expr)
 593 {
 594         if (!expr)
 595                 return 0;
 596         return bytes_to_elements(expr, get_array_size_bytes_max(expr));
 597 }
 598
 599 static struct expression *strip_ampersands(struct expression *expr)
 600 {
 601         struct symbol *type;
 602
 603         if (expr->type != EXPR_PREOP)
 604                 return expr;
 605         if (expr->op != '&')
 606                 return expr;
 607         type = get_type(expr->unop);
 608         if (!type || type->type != SYM_ARRAY)
 609                 return expr;
 610         return expr->unop;
 611 }
 612
 613 static void info_record_alloction(struct expression *buffer, struct range_list *rl)
 614 {
 615         char *name;
 616
 617         if (!option_info)
 618                 return;
 619
 620         name = get_member_name(buffer);
 621         if (!name && is_static(buffer))
 622                 name = expr_to_var(buffer);
 623         if (!name)
 624                 return;
 625         if (rl && !is_whole_rl(rl))
 626                 sql_insert_function_type_size(name, show_rl(rl));
 627         else
 628                 sql_insert_function_type_size(name, "(-1)");
 629
 630         free_string(name);
 631 }
 632
 633 static void store_alloc(struct expression *expr, struct range_list *rl)
 634 {
 635         struct symbol *type;
 636
 637         rl = clone_rl(rl); // FIXME!!!
 638         set_state_expr(my_size_id, expr, alloc_estate_rl(rl));
 639
 640         type = get_type(expr);
 641         if (!type)
 642                 return;
 643         if (type->type != SYM_PTR)
 644                 return;
 645         type = get_real_base_type(type);
 646         if (!type)
 647                 return;
 648         if (type == &void_ctype)
 649                 return;
 650         if (type->type != SYM_BASETYPE && type->type != SYM_PTR)
 651                 return;
 652
 653         info_record_alloction(expr, rl);
 654 }
 655
 656 static void match_array_assignment(struct expression *expr)
 657 {
 658         struct expression *left;
 659         struct expression *right;
 660         char *left_member, *right_member;
 661         struct range_list *rl;
 662         sval_t sval;
 663
 664         if (expr->op != '=')
 665                 return;
 666         left = strip_expr(expr->left);
 667         right = strip_expr(expr->right);
 668         right = strip_ampersands(right);
 669
 670         if (!is_pointer(left))
 671                 return;
 672         if (is_allocation_function(right))
 673                 return;
 674
 675         left_member = get_member_name(left);
 676         right_member = get_member_name(right);
 677         if (left_member && right_member && strcmp(left_member, right_member) == 0) {
 678                 free_string(left_member);
 679                 free_string(right_member);
 680                 return;
 681         }
 682         free_string(left_member);
 683         free_string(right_member);
 684
 685         if (get_implied_value(right, &sval) && sval.value == 0) {
 686                 rl = alloc_int_rl(0);
 687                 goto store;
 688         }
 689
 690         rl = get_array_size_bytes_rl(right);
 691
 692 store:
 693         store_alloc(left, rl);
 694 }
 695
 696 static void match_alloc(const char *fn, struct expression *expr, void *_size_arg)
 697 {
 698         int size_arg = PTR_INT(_size_arg);
 699         struct expression *right;
 700         struct expression *arg;
 701         struct range_list *rl;
 702
 703         right = strip_expr(expr->right);
 704         arg = get_argument_from_call_expr(right->args, size_arg);
 705         get_absolute_rl(arg, &rl);
 706         rl = cast_rl(&int_ctype, rl);
 707         store_alloc(expr->left, rl);
 708 }
 709
 710 static void match_calloc(const char *fn, struct expression *expr, void *unused)
 711 {
 712         struct expression *right;
 713         struct expression *arg;
 714         sval_t elements;
 715         sval_t size;
 716
 717         right = strip_expr(expr->right);
 718         arg = get_argument_from_call_expr(right->args, 0);
 719         if (!get_implied_value(arg, &elements))
 720                 return; // FIXME!!!
 721         arg = get_argument_from_call_expr(right->args, 1);
 722         if (get_implied_value(arg, &size))
 723                 store_alloc(expr->left, size_to_rl(elements.value * size.value));
 724         else
 725                 store_alloc(expr->left, size_to_rl(-1));
 726 }
 727
 728 static void match_page(const char *fn, struct expression *expr, void *_unused)
 729 {
 730         sval_t page_size = {
 731                 .type = &int_ctype,
 732                 {.value = 4096},
 733         };
 734
 735         store_alloc(expr->left, alloc_rl(page_size, page_size));
 736 }
 737
 738 static void match_strndup(const char *fn, struct expression *expr, void *unused)
 739 {
 740         struct expression *fn_expr;
 741         struct expression *size_expr;
 742         sval_t size;
 743
 744         fn_expr = strip_expr(expr->right);
 745         size_expr = get_argument_from_call_expr(fn_expr->args, 1);
 746         if (get_implied_max(size_expr, &size)) {
 747                 size.value++;
 748                 store_alloc(expr->left, size_to_rl(size.value));
 749         } else {
 750                 store_alloc(expr->left, size_to_rl(-1));
 751         }
 752
 753 }
 754
 755 static void match_alloc_pages(const char *fn, struct expression *expr, void *_order_arg)
 756 {
 757         int order_arg = PTR_INT(_order_arg);
 758         struct expression *right;
 759         struct expression *arg;
 760         sval_t sval;
 761
 762         right = strip_expr(expr->right);
 763         arg = get_argument_from_call_expr(right->args, order_arg);
 764         if (!get_implied_value(arg, &sval))
 765                 return;
 766         if (sval.value < 0 || sval.value > 10)
 767                 return;
 768
 769         sval.type = &int_ctype;
 770         sval.value = 1 << sval.value;
 771         sval.value *= 4096;
 772
 773         store_alloc(expr->left, alloc_rl(sval, sval));
 774 }
 775
 776 static void match_call(struct expression *expr)
 777 {
 778         struct expression *arg;
 779         struct symbol *type;
 780         struct range_list *rl;
 781         int i;
 782
 783         i = -1;
 784         FOR_EACH_PTR(expr->args, arg) {
 785                 i++;
 786                 type = get_type(arg);
 787                 if (!type || (type->type != SYM_PTR && type->type != SYM_ARRAY))
 788                         continue;
 789                 rl = get_array_size_bytes_rl(arg);
 790                 if (!rl)
 791                         continue;
 792                 if (is_whole_rl(rl))
 793                         continue;
 794                 sql_insert_caller_info(expr, BUF_SIZE, i, "$", show_rl(rl));
 795         } END_FOR_EACH_PTR(arg);
 796 }
 797
 798 static void struct_member_callback(struct expression *call, int param, char *printed_name, struct sm_state *sm)
 799 {
 800         if (sm->state == &merged ||
 801             strcmp(sm->state->name, "(-1)") == 0 ||
 802             strcmp(sm->state->name, "empty") == 0 ||
 803             strcmp(sm->state->name, "0") == 0)
 804                 return;
 805         sql_insert_caller_info(call, BUF_SIZE, param, printed_name, sm->state->name);
 806 }
 807
 808 /*
 809  * This is slightly (very) weird because half of this stuff is handled in
 810  * smatch_parse_call_math.c which is poorly named.  But anyway, add some buf
 811  * sizes here.
 812  *
 813  */
 814 static void print_returned_allocations(int return_id, char *return_ranges, struct expression *expr)
 815 {
 816         char buf[16];
 817         int size;
 818
 819         size = get_array_size_bytes(expr);
 820         if (!size)
 821                 return;
 822
 823         snprintf(buf, sizeof(buf), "%d", size);
 824         sql_insert_return_states(return_id, return_ranges, BUF_SIZE, -1, "", buf);
 825 }
 826
 827 static void record_global_size(struct symbol *sym)
 828 {
 829         struct symbol *type;
 830         int elements, bpe, bytes;
 831         char buf[16];
 832
 833         if (!sym->ident)
 834                 return;
 835
 836         if (!(sym->ctype.modifiers & MOD_TOPLEVEL) ||
 837             sym->ctype.modifiers & MOD_STATIC)
 838                 return;
 839
 840         type = get_real_base_type(sym);
 841         elements = get_real_array_size_from_type(type);
 842         if (elements <= 0)
 843                 return;
 844         type = get_real_base_type(type);
 845         bpe = type_bytes(type);
 846         bytes = elements * bpe;
 847         snprintf(buf, sizeof(buf), "%d", bytes);
 848         sql_insert_data_info_var_sym(sym->ident->name, sym, BUF_SIZE, buf);
 849 }
 850
 851 void register_buf_size(int id)
 852 {
 853         my_size_id = id;
 854
 855         add_unmatched_state_hook(my_size_id, &unmatched_size_state);
 856
 857         select_caller_info_hook(set_param_buf_size, BUF_SIZE);
 858         select_return_states_hook(BUF_SIZE, &db_returns_buf_size);
 859         add_split_return_callback(print_returned_allocations);
 860
 861         allocation_funcs = create_function_hashtable(100);
 862         add_allocation_function("malloc", &match_alloc, 0);
 863         add_allocation_function("calloc", &match_calloc, 0);
 864         add_allocation_function("memdup", &match_alloc, 1);
 865         add_allocation_function("realloc", &match_alloc, 1);
 866         if (option_project == PROJ_KERNEL) {
 867                 add_allocation_function("kmalloc", &match_alloc, 0);
 868                 add_allocation_function("kmalloc_node", &match_alloc, 0);
 869                 add_allocation_function("kzalloc", &match_alloc, 0);
 870                 add_allocation_function("kzalloc_node", &match_alloc, 0);
 871                 add_allocation_function("vmalloc", &match_alloc, 0);
 872                 add_allocation_function("__vmalloc", &match_alloc, 0);
 873                 add_allocation_function("kcalloc", &match_calloc, 0);
 874                 add_allocation_function("kmalloc_array", &match_calloc, 0);
 875                 add_allocation_function("drm_malloc_ab", &match_calloc, 0);
 876                 add_allocation_function("drm_calloc_large", &match_calloc, 0);
 877                 add_allocation_function("sock_kmalloc", &match_alloc, 1);
 878                 add_allocation_function("kmemdup", &match_alloc, 1);
 879                 add_allocation_function("kmemdup_user", &match_alloc, 1);
 880                 add_allocation_function("dma_alloc_attrs", &match_alloc, 1);
 881                 add_allocation_function("pci_alloc_consistent", &match_alloc, 1);
 882                 add_allocation_function("pci_alloc_coherent", &match_alloc, 1);
 883                 add_allocation_function("devm_kmalloc", &match_alloc, 1);
 884                 add_allocation_function("devm_kzalloc", &match_alloc, 1);
 885                 add_allocation_function("krealloc", &match_alloc, 1);
 886                 add_allocation_function("__alloc_bootmem", &match_alloc, 0);
 887                 add_allocation_function("alloc_bootmem", &match_alloc, 0);
 888                 add_allocation_function("kmap", &match_page, 0);
 889                 add_allocation_function("get_zeroed_page", &match_page, 0);
 890                 add_allocation_function("alloc_pages", &match_alloc_pages, 1);
 891                 add_allocation_function("alloc_pages_current", &match_alloc_pages, 1);
 892                 add_allocation_function("__get_free_pages", &match_alloc_pages, 1);
 893         }
 894
 895         add_allocation_function("strndup", match_strndup, 0);
 896         if (option_project == PROJ_KERNEL)
 897                 add_allocation_function("kstrndup", match_strndup, 0);
 898
 899         add_modification_hook(my_size_id, &set_size_undefined);
 900
 901         add_merge_hook(my_size_id, &merge_size_func);
 902
 903         if (option_info)
 904                 add_hook(record_global_size, BASE_HOOK);
 905 }
 906
 907 void register_buf_size_late(int id)
 908 {
 909         /* has to happen after match_alloc() */
 910         add_hook(&match_array_assignment, ASSIGNMENT_HOOK);
 911
 912         add_hook(&match_call, FUNCTION_CALL_HOOK);
 913         add_member_info_callback(my_size_id, struct_member_callback);
 914 }