smatch_flow.c

   1 /*
   2  * Copyright (C) 2006,2008 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 #define _GNU_SOURCE 1
  19 #include <unistd.h>
  20 #include <stdio.h>
  21 #include "token.h"
  22 #include "scope.h"
  23 #include "smatch.h"
  24 #include "smatch_expression_stacks.h"
  25 #include "smatch_extra.h"
  26 #include "smatch_slist.h"
  27
  28 int __in_fake_assign;
  29 int final_pass;
  30 int __inline_call;
  31 struct expression  *__inline_fn;
  32
  33 static int __smatch_lineno = 0;
  34
  35 static char *base_file;
  36 static const char *filename;
  37 static char *pathname;
  38 static char *full_filename;
  39 static char *cur_func;
  40 static unsigned int loop_count;
  41 static int last_goto_statement_handled;
  42 int __expr_stmt_count;
  43 int __in_function_def;
  44 static struct expression_list *switch_expr_stack = NULL;
  45 static struct expression_list *post_op_stack = NULL;
  46
  47 struct expression_list *big_expression_stack;
  48 struct statement_list *big_statement_stack;
  49 int __in_pre_condition = 0;
  50 int __bail_on_rest_of_function = 0;
  51 static struct timeval fn_start_time;
  52 char *get_function(void) { return cur_func; }
  53 int get_lineno(void) { return __smatch_lineno; }
  54 int inside_loop(void) { return !!loop_count; }
  55 int definitely_inside_loop(void) { return !!(loop_count & ~0x80000000); }
  56 struct expression *get_switch_expr(void) { return top_expression(switch_expr_stack); }
  57 int in_expression_statement(void) { return !!__expr_stmt_count; }
  58
  59 static void split_symlist(struct symbol_list *sym_list);
  60 static void split_declaration(struct symbol_list *sym_list);
  61 static void split_expr_list(struct expression_list *expr_list);
  62 static void add_inline_function(struct symbol *sym);
  63 static void parse_inline(struct expression *expr);
  64
  65 int option_assume_loops = 0;
  66 int option_known_conditions = 0;
  67 int option_two_passes = 0;
  68 struct symbol *cur_func_sym = NULL;
  69 struct stree *global_states;
  70
  71 long long valid_ptr_min = 4096;
  72 long long valid_ptr_max = 7777777777;
  73 sval_t valid_ptr_min_sval = {
  74         .type = &ptr_ctype,
  75         {.value = 4096},
  76 };
  77 sval_t valid_ptr_max_sval = {
  78         .type = &ptr_ctype,
  79         {.value = LONG_MAX - 100000},
  80 };
  81
  82 static void set_valid_ptr_max(void)
  83 {
  84         if (type_bits(&ptr_ctype) == 32)
  85                 valid_ptr_max = 7777777777;
  86         else if (type_bits(&ptr_ctype) == 64)
  87                 valid_ptr_max = 7777777777777777777LL;
  88
  89         valid_ptr_max_sval.value = valid_ptr_max;
  90 }
  91
  92 int outside_of_function(void)
  93 {
  94         return cur_func_sym == NULL;
  95 }
  96
  97 const char *get_filename(void)
  98 {
  99         if (option_info)
 100                 return base_file;
 101         if (option_full_path)
 102                 return full_filename;
 103         return filename;
 104 }
 105
 106 const char *get_base_file(void)
 107 {
 108         return base_file;
 109 }
 110
 111 static void set_position(struct position pos)
 112 {
 113         int len;
 114         static int prev_stream = -1;
 115
 116         if (pos.stream == 0 && pos.line == 0)
 117                 return;
 118
 119         __smatch_lineno = pos.line;
 120
 121         if (pos.stream == prev_stream)
 122                 return;
 123
 124         filename = stream_name(pos.stream);
 125
 126         free(full_filename);
 127         pathname = getcwd(NULL, 0);
 128         if (pathname) {
 129                 len = strlen(pathname) + 1 + strlen(filename) + 1;
 130                 full_filename = malloc(len);
 131                 snprintf(full_filename, len, "%s/%s", pathname, filename);
 132         } else {
 133                 full_filename = alloc_string(filename);
 134         }
 135         free(pathname);
 136 }
 137
 138 static int is_inline_func(struct expression *expr)
 139 {
 140         if (expr->type != EXPR_SYMBOL || !expr->symbol)
 141                 return 0;
 142         if (expr->symbol->ctype.modifiers & MOD_INLINE)
 143                 return 1;
 144         return 0;
 145 }
 146
 147 static int is_noreturn_func(struct expression *expr)
 148 {
 149         if (expr->type != EXPR_SYMBOL || !expr->symbol)
 150                 return 0;
 151         if (expr->symbol->ctype.modifiers & MOD_NORETURN)
 152                 return 1;
 153         return 0;
 154 }
 155
 156 int inlinable(struct expression *expr)
 157 {
 158         struct symbol *sym;
 159
 160         if (__inline_fn)  /* don't nest */
 161                 return 0;
 162
 163         if (expr->type != EXPR_SYMBOL || !expr->symbol)
 164                 return 0;
 165         if (is_no_inline_function(expr->symbol->ident->name))
 166                 return 0;
 167         sym = get_base_type(expr->symbol);
 168         if (sym->stmt && sym->stmt->type == STMT_COMPOUND) {
 169                 if (ptr_list_size((struct ptr_list *)sym->stmt->stmts) <= 10)
 170                         return 1;
 171                 return 0;
 172         }
 173         if (sym->inline_stmt && sym->inline_stmt->type == STMT_COMPOUND) {
 174                 if (ptr_list_size((struct ptr_list *)sym->inline_stmt->stmts) <= 10)
 175                         return 1;
 176                 return 0;
 177         }
 178         return 0;
 179 }
 180
 181 void __process_post_op_stack(void)
 182 {
 183         struct expression *expr;
 184
 185         FOR_EACH_PTR(post_op_stack, expr) {
 186                 __pass_to_client(expr, OP_HOOK);
 187         } END_FOR_EACH_PTR(expr);
 188
 189         __free_ptr_list((struct ptr_list **)&post_op_stack);
 190 }
 191
 192 void __split_expr(struct expression *expr)
 193 {
 194         if (!expr)
 195                 return;
 196
 197         // sm_msg(" Debug expr_type %d %s", expr->type, show_special(expr->op));
 198
 199         if (__in_fake_assign && expr->type != EXPR_ASSIGNMENT)
 200                 return;
 201         if (__in_fake_assign >= 4)  /* don't allow too much nesting */
 202                 return;
 203
 204         push_expression(&big_expression_stack, expr);
 205         set_position(expr->pos);
 206         __pass_to_client(expr, EXPR_HOOK);
 207
 208         switch (expr->type) {
 209         case EXPR_PREOP:
 210                 if (expr->op == '*')
 211                         __pass_to_client(expr, DEREF_HOOK);
 212                 __split_expr(expr->unop);
 213                 __pass_to_client(expr, OP_HOOK);
 214                 break;
 215         case EXPR_POSTOP:
 216                 __split_expr(expr->unop);
 217                 push_expression(&post_op_stack, expr);
 218                 break;
 219         case EXPR_STATEMENT:
 220                 __expr_stmt_count++;
 221                 __split_stmt(expr->statement);
 222                 __expr_stmt_count--;
 223                 break;
 224         case EXPR_LOGICAL:
 225         case EXPR_COMPARE:
 226                 __pass_to_client(expr, LOGIC_HOOK);
 227                 __handle_logic(expr);
 228                 break;
 229         case EXPR_BINOP:
 230                 __pass_to_client(expr, BINOP_HOOK);
 231         case EXPR_COMMA:
 232                 __split_expr(expr->left);
 233                 __process_post_op_stack();
 234                 __split_expr(expr->right);
 235                 break;
 236         case EXPR_ASSIGNMENT: {
 237                 struct expression *tmp;
 238
 239                 if (!expr->right)
 240                         break;
 241
 242                 __pass_to_client(expr, RAW_ASSIGNMENT_HOOK);
 243
 244                 /* foo = !bar() */
 245                 if (__handle_condition_assigns(expr))
 246                         break;
 247                 /* foo = (x < 5 ? foo : 5); */
 248                 if (__handle_select_assigns(expr))
 249                         break;
 250                 /* foo = ({frob(); frob(); frob(); 1;}) */
 251                 if (__handle_expr_statement_assigns(expr))
 252                         break;
 253
 254                 __split_expr(expr->right);
 255                 if (outside_of_function())
 256                         __pass_to_client(expr, GLOBAL_ASSIGNMENT_HOOK);
 257                 else
 258                         __pass_to_client(expr, ASSIGNMENT_HOOK);
 259
 260                 __fake_struct_member_assignments(expr);
 261
 262                 tmp = strip_expr(expr->right);
 263                 if (tmp->type == EXPR_CALL)
 264                         __pass_to_client(expr, CALL_ASSIGNMENT_HOOK);
 265                 if (get_macro_name(tmp->pos) &&
 266                     get_macro_name(expr->pos) != get_macro_name(tmp->pos))
 267                         __pass_to_client(expr, MACRO_ASSIGNMENT_HOOK);
 268                 __split_expr(expr->left);
 269                 break;
 270         }
 271         case EXPR_DEREF:
 272                 __pass_to_client(expr, DEREF_HOOK);
 273                 __split_expr(expr->deref);
 274                 break;
 275         case EXPR_SLICE:
 276                 __split_expr(expr->base);
 277                 break;
 278         case EXPR_CAST:
 279         case EXPR_FORCE_CAST:
 280                 __pass_to_client(expr, CAST_HOOK);
 281                 __split_expr(expr->cast_expression);
 282                 break;
 283         case EXPR_SIZEOF:
 284                 if (expr->cast_expression)
 285                         __pass_to_client(strip_parens(expr->cast_expression),
 286                                          SIZEOF_HOOK);
 287                 break;
 288         case EXPR_OFFSETOF:
 289         case EXPR_ALIGNOF:
 290                 evaluate_expression(expr);
 291                 break;
 292         case EXPR_CONDITIONAL:
 293         case EXPR_SELECT:
 294                 if (known_condition_true(expr->conditional)) {
 295                         __split_expr(expr->cond_true);
 296                         break;
 297                 }
 298                 if (known_condition_false(expr->conditional)) {
 299                         __split_expr(expr->cond_false);
 300                         break;
 301                 }
 302                 __pass_to_client(expr, SELECT_HOOK);
 303                 __split_whole_condition(expr->conditional);
 304                 __split_expr(expr->cond_true);
 305                 __push_true_states();
 306                 __use_false_states();
 307                 __split_expr(expr->cond_false);
 308                 __merge_true_states();
 309                 break;
 310         case EXPR_CALL:
 311                 if (sym_name_is("__builtin_constant_p", expr->fn))
 312                         break;
 313                 split_expr_list(expr->args);
 314                 __split_expr(expr->fn);
 315                 if (is_inline_func(expr->fn))
 316                         add_inline_function(expr->fn->symbol);
 317                 if (inlinable(expr->fn))
 318                         __inline_call = 1;
 319                 __process_post_op_stack();
 320                 __pass_to_client(expr, FUNCTION_CALL_HOOK);
 321                 __inline_call = 0;
 322                 if (inlinable(expr->fn)) {
 323                         parse_inline(expr);
 324                 }
 325                 __pass_to_client(expr, CALL_HOOK_AFTER_INLINE);
 326                 if (is_noreturn_func(expr->fn))
 327                         nullify_path();
 328                 break;
 329         case EXPR_INITIALIZER:
 330                 split_expr_list(expr->expr_list);
 331                 break;
 332         case EXPR_IDENTIFIER:
 333                 __split_expr(expr->ident_expression);
 334                 break;
 335         case EXPR_INDEX:
 336                 __split_expr(expr->idx_expression);
 337                 break;
 338         case EXPR_POS:
 339                 __split_expr(expr->init_expr);
 340                 break;
 341         case EXPR_SYMBOL:
 342                 __pass_to_client(expr, SYM_HOOK);
 343                 break;
 344         case EXPR_STRING:
 345                 __pass_to_client(expr, STRING_HOOK);
 346                 break;
 347         default:
 348                 break;
 349         };
 350         pop_expression(&big_expression_stack);
 351 }
 352
 353 static int is_forever_loop(struct statement *stmt)
 354 {
 355         struct expression *expr;
 356
 357         expr = strip_expr(stmt->iterator_pre_condition);
 358         if (!expr)
 359                 expr = stmt->iterator_post_condition;
 360         if (!expr) {
 361                 /* this is a for(;;) loop... */
 362                 return 1;
 363         }
 364
 365         if (expr->type == EXPR_VALUE && expr->value == 1)
 366                 return 1;
 367
 368         return 0;
 369 }
 370
 371 static int loop_num;
 372 static char *get_loop_name(int num)
 373 {
 374         char buf[256];
 375
 376         snprintf(buf, 255, "-loop%d", num);
 377         buf[255] = '\0';
 378         return alloc_sname(buf);
 379 }
 380
 381 /*
 382  * Pre Loops are while and for loops.
 383  */
 384 static void handle_pre_loop(struct statement *stmt)
 385 {
 386         int once_through; /* we go through the loop at least once */
 387         struct sm_state *extra_sm = NULL;
 388         int unchanged = 0;
 389         char *loop_name;
 390         struct stree *stree = NULL;
 391         struct sm_state *sm = NULL;
 392
 393         loop_name = get_loop_name(loop_num);
 394         loop_num++;
 395
 396         __split_stmt(stmt->iterator_pre_statement);
 397
 398         once_through = implied_condition_true(stmt->iterator_pre_condition);
 399
 400         loop_count++;
 401         __push_continues();
 402         __push_breaks();
 403
 404         __merge_gotos(loop_name);
 405
 406         extra_sm = __extra_handle_canonical_loops(stmt, &stree);
 407         __in_pre_condition++;
 408         __pass_to_client(stmt, PRELOOP_HOOK);
 409         __split_whole_condition(stmt->iterator_pre_condition);
 410         __in_pre_condition--;
 411         FOR_EACH_SM(stree, sm) {
 412                 set_state(sm->owner, sm->name, sm->sym, sm->state);
 413         } END_FOR_EACH_SM(sm);
 414         free_stree(&stree);
 415         if (extra_sm)
 416                 extra_sm = get_sm_state(extra_sm->owner, extra_sm->name, extra_sm->sym);
 417
 418         if (option_assume_loops)
 419                 once_through = 1;
 420
 421         __split_stmt(stmt->iterator_statement);
 422         __warn_on_silly_pre_loops();
 423         if (is_forever_loop(stmt)) {
 424                 __merge_continues();
 425                 __save_gotos(loop_name);
 426
 427                 __push_fake_cur_stree();
 428                 __split_stmt(stmt->iterator_post_statement);
 429                 stree = __pop_fake_cur_stree();
 430
 431                 __discard_false_states();
 432                 __use_breaks();
 433
 434                 if (!__path_is_null())
 435                         __merge_stree_into_cur(stree);
 436                 free_stree(&stree);
 437         } else {
 438                 __merge_continues();
 439                 unchanged = __iterator_unchanged(extra_sm);
 440                 __split_stmt(stmt->iterator_post_statement);
 441                 __save_gotos(loop_name);
 442                 __in_pre_condition++;
 443                 __split_whole_condition(stmt->iterator_pre_condition);
 444                 __in_pre_condition--;
 445                 nullify_path();
 446                 __merge_false_states();
 447                 if (once_through)
 448                         __discard_false_states();
 449                 else
 450                         __merge_false_states();
 451
 452                 if (extra_sm && unchanged)
 453                         __extra_pre_loop_hook_after(extra_sm,
 454                                                 stmt->iterator_post_statement,
 455                                                 stmt->iterator_pre_condition);
 456                 __merge_breaks();
 457         }
 458         loop_count--;
 459 }
 460
 461 /*
 462  * Post loops are do {} while();
 463  */
 464 static void handle_post_loop(struct statement *stmt)
 465 {
 466         char *loop_name;
 467
 468         loop_name = get_loop_name(loop_num);
 469         loop_num++;
 470         loop_count++;
 471
 472         __push_continues();
 473         __push_breaks();
 474         __merge_gotos(loop_name);
 475         __split_stmt(stmt->iterator_statement);
 476         __merge_continues();
 477         if (!is_zero(stmt->iterator_post_condition))
 478                 __save_gotos(loop_name);
 479
 480         if (is_forever_loop(stmt)) {
 481                 __use_breaks();
 482         } else {
 483                 __split_whole_condition(stmt->iterator_post_condition);
 484                 __use_false_states();
 485                 __merge_breaks();
 486         }
 487         loop_count--;
 488 }
 489
 490 static int empty_statement(struct statement *stmt)
 491 {
 492         if (!stmt)
 493                 return 0;
 494         if (stmt->type == STMT_EXPRESSION && !stmt->expression)
 495                 return 1;
 496         return 0;
 497 }
 498
 499 static int last_stmt_on_same_line(void)
 500 {
 501         struct statement *stmt;
 502         int i = 0;
 503
 504         FOR_EACH_PTR_REVERSE(big_statement_stack, stmt) {
 505                 if (!i++)
 506                         continue;
 507                 if  (stmt->pos.line == get_lineno())
 508                         return 1;
 509                 return 0;
 510         } END_FOR_EACH_PTR_REVERSE(stmt);
 511         return 0;
 512 }
 513
 514 static void split_asm_constraints(struct expression_list *expr_list)
 515 {
 516         struct expression *expr;
 517         int state = 0;
 518
 519         FOR_EACH_PTR(expr_list, expr) {
 520                 switch (state) {
 521                 case 0: /* identifier */
 522                 case 1: /* constraint */
 523                         state++;
 524                         continue;
 525                 case 2: /* expression */
 526                         state = 0;
 527                         __split_expr(expr);
 528                         continue;
 529                 }
 530         } END_FOR_EACH_PTR(expr);
 531 }
 532
 533 static int is_case_val(struct statement *stmt, sval_t sval)
 534 {
 535         sval_t case_sval;
 536
 537         if (stmt->type != STMT_CASE)
 538                 return 0;
 539         if (!stmt->case_expression) {
 540                 __set_default();
 541                 return 1;
 542         }
 543         if (!get_value(stmt->case_expression, &case_sval))
 544                 return 0;
 545         if (case_sval.value == sval.value)
 546                 return 1;
 547         return 0;
 548 }
 549
 550 static void split_known_switch(struct statement *stmt, sval_t sval)
 551 {
 552         struct statement *tmp;
 553
 554         __split_expr(stmt->switch_expression);
 555
 556         push_expression(&switch_expr_stack, stmt->switch_expression);
 557         __save_switch_states(top_expression(switch_expr_stack));
 558         nullify_path();
 559         __push_default();
 560         __push_breaks();
 561
 562         stmt = stmt->switch_statement;
 563
 564         __push_scope_hooks();
 565         FOR_EACH_PTR(stmt->stmts, tmp) {
 566                 __smatch_lineno = tmp->pos.line;
 567                 if (is_case_val(tmp, sval)) {
 568                         __merge_switches(top_expression(switch_expr_stack),
 569                                          stmt->case_expression);
 570                         __pass_case_to_client(top_expression(switch_expr_stack),
 571                                               stmt->case_expression);
 572                 }
 573                 if (__path_is_null())
 574                         continue;
 575                 __split_stmt(tmp);
 576                 if (__path_is_null()) {
 577                         __set_default();
 578                         goto out;
 579                 }
 580         } END_FOR_EACH_PTR(tmp);
 581 out:
 582         __call_scope_hooks();
 583         if (!__pop_default())
 584                 __merge_switches(top_expression(switch_expr_stack),
 585                                  NULL);
 586         __discard_switches();
 587         __merge_breaks();
 588         pop_expression(&switch_expr_stack);
 589 }
 590
 591 static int taking_too_long(void)
 592 {
 593         int ms;
 594
 595         ms = ms_since(&fn_start_time);
 596         if (ms > 1000 * 60 * 5)  /* five minutes */
 597                 return 1;
 598         return 0;
 599 }
 600
 601 static int is_last_stmt(struct statement *cur_stmt)
 602 {
 603         struct symbol *fn = get_base_type(cur_func_sym);
 604         struct statement *stmt;
 605
 606         if (!fn)
 607                 return 0;
 608         stmt = fn->stmt;
 609         if (!stmt)
 610                 stmt = fn->inline_stmt;
 611         if (!stmt || stmt->type != STMT_COMPOUND)
 612                 return 0;
 613         stmt = last_ptr_list((struct ptr_list *)stmt->stmts);
 614         if (stmt && stmt->type == STMT_LABEL)
 615                 stmt = stmt->label_statement;
 616         if (stmt == cur_stmt)
 617                 return 1;
 618         return 0;
 619 }
 620
 621 static void handle_backward_goto(struct statement *goto_stmt)
 622 {
 623         const char *goto_name, *label_name;
 624         struct statement *func_stmt;
 625         struct symbol *base_type = get_base_type(cur_func_sym);
 626         struct statement *tmp;
 627         int found = 0;
 628
 629         if (!option_info)
 630                 return;
 631         if (last_goto_statement_handled)
 632                 return;
 633         last_goto_statement_handled = 1;
 634
 635         if (!goto_stmt->goto_label ||
 636             goto_stmt->goto_label->type != SYM_LABEL ||
 637             !goto_stmt->goto_label->ident)
 638                 return;
 639         goto_name = goto_stmt->goto_label->ident->name;
 640
 641         func_stmt = base_type->stmt;
 642         if (!func_stmt)
 643                 func_stmt = base_type->inline_stmt;
 644         if (!func_stmt)
 645                 return;
 646         if (func_stmt->type != STMT_COMPOUND)
 647                 return;
 648
 649         FOR_EACH_PTR(func_stmt->stmts, tmp) {
 650                 if (!found) {
 651                         if (tmp->type != STMT_LABEL)
 652                                 continue;
 653                         if (!tmp->label_identifier ||
 654                             tmp->label_identifier->type != SYM_LABEL ||
 655                             !tmp->label_identifier->ident)
 656                                 continue;
 657                         label_name = tmp->label_identifier->ident->name;
 658                         if (strcmp(goto_name, label_name) != 0)
 659                                 continue;
 660                         found = 1;
 661                 }
 662                 __split_stmt(tmp);
 663         } END_FOR_EACH_PTR(tmp);
 664 }
 665
 666 static void fake_a_return(void)
 667 {
 668         struct symbol *return_type;
 669
 670         nullify_path();
 671         __unnullify_path();
 672
 673         return_type = get_real_base_type(cur_func_sym);
 674         return_type = get_real_base_type(return_type);
 675         if (return_type != &void_ctype) {
 676                 __pass_to_client(unknown_value_expression(NULL), RETURN_HOOK);
 677                 nullify_path();
 678         }
 679
 680         __pass_to_client(cur_func_sym, END_FUNC_HOOK);
 681         __pass_to_client(cur_func_sym, AFTER_FUNC_HOOK);
 682 }
 683
 684 void __split_stmt(struct statement *stmt)
 685 {
 686         sval_t sval;
 687
 688         if (!stmt)
 689                 goto out;
 690
 691         if (__bail_on_rest_of_function || out_of_memory() || taking_too_long()) {
 692                 static char *printed = NULL;
 693
 694                 __bail_on_rest_of_function = 1;
 695                 if (printed != cur_func)
 696                         sm_msg("Function too hairy.  Giving up.");
 697                 fake_a_return();
 698                 final_pass = 0;  /* turn off sm_msg() from here */
 699                 printed = cur_func;
 700                 return;
 701         }
 702
 703         add_ptr_list(&big_statement_stack, stmt);
 704         free_expression_stack(&big_expression_stack);
 705         set_position(stmt->pos);
 706         __pass_to_client(stmt, STMT_HOOK);
 707
 708         switch (stmt->type) {
 709         case STMT_DECLARATION:
 710                 split_declaration(stmt->declaration);
 711                 break;
 712         case STMT_RETURN:
 713                 __split_expr(stmt->ret_value);
 714                 __pass_to_client(stmt->ret_value, RETURN_HOOK);
 715                 __process_post_op_stack();
 716                 nullify_path();
 717                 break;
 718         case STMT_EXPRESSION:
 719                 __split_expr(stmt->expression);
 720                 break;
 721         case STMT_COMPOUND: {
 722                 struct statement *tmp;
 723
 724                 __push_scope_hooks();
 725                 FOR_EACH_PTR(stmt->stmts, tmp) {
 726                         __split_stmt(tmp);
 727                 } END_FOR_EACH_PTR(tmp);
 728                 __call_scope_hooks();
 729                 break;
 730         }
 731         case STMT_IF:
 732                 if (known_condition_true(stmt->if_conditional)) {
 733                         __split_stmt(stmt->if_true);
 734                         break;
 735                 }
 736                 if (known_condition_false(stmt->if_conditional)) {
 737                         __split_stmt(stmt->if_false);
 738                         break;
 739                 }
 740                 if (option_known_conditions &&
 741                     implied_condition_true(stmt->if_conditional)) {
 742                         sm_info("this condition is true.");
 743                         __split_stmt(stmt->if_true);
 744                         break;
 745                 }
 746                 if (option_known_conditions &&
 747                     implied_condition_false(stmt->if_conditional)) {
 748                         sm_info("this condition is false.");
 749                         __split_stmt(stmt->if_false);
 750                         break;
 751                 }
 752                 __split_whole_condition(stmt->if_conditional);
 753                 __split_stmt(stmt->if_true);
 754                 if (empty_statement(stmt->if_true) &&
 755                         last_stmt_on_same_line() &&
 756                         !get_macro_name(stmt->if_true->pos))
 757                         sm_msg("warn: if();");
 758                 __push_true_states();
 759                 __use_false_states();
 760                 __split_stmt(stmt->if_false);
 761                 __merge_true_states();
 762                 break;
 763         case STMT_ITERATOR:
 764                 if (stmt->iterator_pre_condition)
 765                         handle_pre_loop(stmt);
 766                 else if (stmt->iterator_post_condition)
 767                         handle_post_loop(stmt);
 768                 else {
 769                         // these are for(;;) type loops.
 770                         handle_pre_loop(stmt);
 771                 }
 772                 break;
 773         case STMT_SWITCH:
 774                 if (get_value(stmt->switch_expression, &sval)) {
 775                         split_known_switch(stmt, sval);
 776                         break;
 777                 }
 778                 __split_expr(stmt->switch_expression);
 779                 push_expression(&switch_expr_stack, stmt->switch_expression);
 780                 __save_switch_states(top_expression(switch_expr_stack));
 781                 nullify_path();
 782                 __push_default();
 783                 __push_breaks();
 784                 __split_stmt(stmt->switch_statement);
 785                 if (!__pop_default())
 786                         __merge_switches(top_expression(switch_expr_stack),
 787                                       NULL);
 788                 __discard_switches();
 789                 __merge_breaks();
 790                 pop_expression(&switch_expr_stack);
 791                 break;
 792         case STMT_CASE:
 793                 __merge_switches(top_expression(switch_expr_stack),
 794                                       stmt->case_expression);
 795                 __pass_case_to_client(top_expression(switch_expr_stack),
 796                                       stmt->case_expression);
 797                 if (!stmt->case_expression)
 798                         __set_default();
 799                 __split_expr(stmt->case_expression);
 800                 __split_expr(stmt->case_to);
 801                 __split_stmt(stmt->case_statement);
 802                 break;
 803         case STMT_LABEL:
 804                 if (stmt->label_identifier &&
 805                     stmt->label_identifier->type == SYM_LABEL &&
 806                     stmt->label_identifier->ident) {
 807                         loop_count |= 0x80000000;
 808                         __merge_gotos(stmt->label_identifier->ident->name);
 809                 }
 810                 __split_stmt(stmt->label_statement);
 811                 break;
 812         case STMT_GOTO:
 813                 __split_expr(stmt->goto_expression);
 814                 if (stmt->goto_label && stmt->goto_label->type == SYM_NODE) {
 815                         if (!strcmp(stmt->goto_label->ident->name, "break")) {
 816                                 __process_breaks();
 817                         } else if (!strcmp(stmt->goto_label->ident->name,
 818                                            "continue")) {
 819                                 __process_continues();
 820                         }
 821                 } else if (stmt->goto_label &&
 822                            stmt->goto_label->type == SYM_LABEL &&
 823                            stmt->goto_label->ident) {
 824                         __save_gotos(stmt->goto_label->ident->name);
 825                 }
 826                 nullify_path();
 827                 if (is_last_stmt(stmt))
 828                         handle_backward_goto(stmt);
 829                 break;
 830         case STMT_NONE:
 831                 break;
 832         case STMT_ASM:
 833                 __pass_to_client(stmt, ASM_HOOK);
 834                 __split_expr(stmt->asm_string);
 835                 split_asm_constraints(stmt->asm_outputs);
 836                 split_asm_constraints(stmt->asm_inputs);
 837                 split_asm_constraints(stmt->asm_clobbers);
 838                 break;
 839         case STMT_CONTEXT:
 840                 break;
 841         case STMT_RANGE:
 842                 __split_expr(stmt->range_expression);
 843                 __split_expr(stmt->range_low);
 844                 __split_expr(stmt->range_high);
 845                 break;
 846         }
 847         __pass_to_client(stmt, STMT_HOOK_AFTER);
 848 out:
 849         __process_post_op_stack();
 850 }
 851
 852 static void split_expr_list(struct expression_list *expr_list)
 853 {
 854         struct expression *expr;
 855
 856         FOR_EACH_PTR(expr_list, expr) {
 857                 __split_expr(expr);
 858                 __process_post_op_stack();
 859         } END_FOR_EACH_PTR(expr);
 860 }
 861
 862 static void split_sym(struct symbol *sym)
 863 {
 864         if (!sym)
 865                 return;
 866         if (!(sym->namespace & NS_SYMBOL))
 867                 return;
 868
 869         __split_stmt(sym->stmt);
 870         __split_expr(sym->array_size);
 871         split_symlist(sym->arguments);
 872         split_symlist(sym->symbol_list);
 873         __split_stmt(sym->inline_stmt);
 874         split_symlist(sym->inline_symbol_list);
 875 }
 876
 877 static void split_symlist(struct symbol_list *sym_list)
 878 {
 879         struct symbol *sym;
 880
 881         FOR_EACH_PTR(sym_list, sym) {
 882                 split_sym(sym);
 883         } END_FOR_EACH_PTR(sym);
 884 }
 885
 886 typedef void (fake_cb)(struct expression *expr);
 887
 888 static int member_to_number(struct expression *expr, struct ident *member)
 889 {
 890         struct symbol *type, *tmp;
 891         char *name;
 892         int i;
 893
 894         if (!member)
 895                 return -1;
 896         name = member->name;
 897
 898         type = get_type(expr);
 899         if (!type || type->type != SYM_STRUCT)
 900                 return -1;
 901
 902         i = -1;
 903         FOR_EACH_PTR(type->symbol_list, tmp) {
 904                 i++;
 905                 if (!tmp->ident)
 906                         continue;
 907                 if (strcmp(name, tmp->ident->name) == 0)
 908                         return i;
 909         } END_FOR_EACH_PTR(tmp);
 910         return -1;
 911 }
 912
 913 static struct ident *number_to_member(struct expression *expr, int num)
 914 {
 915         struct symbol *type, *member;
 916         int i = 0;
 917
 918         type = get_type(expr);
 919         if (!type || type->type != SYM_STRUCT)
 920                 return NULL;
 921
 922         FOR_EACH_PTR(type->symbol_list, member) {
 923                 if (i == num)
 924                         return member->ident;
 925                 i++;
 926         } END_FOR_EACH_PTR(member);
 927         return NULL;
 928 }
 929
 930 static void fake_element_assigns_helper(struct expression *array, struct expression_list *expr_list, fake_cb *fake_cb);
 931
 932 struct member_set {
 933         struct ident *ident;
 934         int set;
 935 };
 936
 937 static struct member_set *alloc_member_set(struct symbol *type)
 938 {
 939         struct member_set *member_set;
 940         struct symbol *member;
 941         int member_count;
 942         int member_idx;
 943
 944         member_count = ptr_list_size((struct ptr_list *)type->symbol_list);
 945         member_set = malloc(member_count * sizeof(*member_set));
 946         member_idx = 0;
 947         FOR_EACH_PTR(type->symbol_list, member) {
 948                 member_set[member_idx].ident = member->ident;
 949                 member_set[member_idx].set = 0;
 950                 member_idx++;
 951         } END_FOR_EACH_PTR(member);
 952
 953         return member_set;
 954 }
 955
 956 static void mark_member_as_set(struct symbol *type, struct member_set *member_set, struct ident *ident)
 957 {
 958         int member_count = ptr_list_size((struct ptr_list *)type->symbol_list);
 959         int i;
 960
 961         for (i = 0; i < member_count; i++) {
 962                 if (member_set[i].ident == ident) {
 963                         member_set[i].set = 1;
 964                         return;
 965                 }
 966         }
 967 //      crap.  this is buggy.
 968 //      sm_msg("internal smatch error in initializer %s.%s", type->ident->name, ident->name);
 969 }
 970
 971 static void set_unset_to_zero(struct expression *symbol, struct symbol *type, struct member_set *member_set)
 972 {
 973         struct expression *deref, *assign;
 974         struct symbol *member, *member_type;
 975         int member_idx;
 976
 977         member_idx = 0;
 978         FOR_EACH_PTR(type->symbol_list, member) {
 979                 if (!member->ident || member_set[member_idx].set) {
 980                         member_idx++;
 981                         continue;
 982                 }
 983                 member_type = get_real_base_type(member);
 984                 if (!member_type || member_type->type == SYM_ARRAY) {
 985                         member_idx++;
 986                         continue;
 987                 }
 988                 /* TODO: this should be handled recursively and not ignored */
 989                 if (member_type->type == SYM_STRUCT || member_type->type == SYM_UNION) {
 990                         member_idx++;
 991                         continue;
 992                 }
 993                 deref = member_expression(symbol, '.', member->ident);
 994                 assign = assign_expression(deref, zero_expr());
 995                 __split_expr(assign);
 996                 member_idx++;
 997         } END_FOR_EACH_PTR(member);
 998
 999 }
1000
1001 static void fake_member_assigns_helper(struct expression *symbol, struct expression_list *members, fake_cb *fake_cb)
1002 {
1003         struct expression *deref, *assign, *tmp;
1004         struct symbol *struct_type, *type;
1005         struct ident *member;
1006         int member_idx;
1007         struct member_set *member_set;
1008
1009         struct_type = get_type(symbol);
1010         if (!struct_type ||
1011             (struct_type->type != SYM_STRUCT && struct_type->type != SYM_UNION))
1012                 return;
1013
1014         member_set = alloc_member_set(struct_type);
1015
1016         member_idx = 0;
1017         FOR_EACH_PTR(members, tmp) {
1018                 member = number_to_member(symbol, member_idx);
1019                 while (tmp->type == EXPR_IDENTIFIER) {
1020                         member = tmp->expr_ident;
1021                         member_idx = member_to_number(symbol, member);
1022                         tmp = tmp->ident_expression;
1023                 }
1024                 mark_member_as_set(struct_type, member_set, member);
1025                 member_idx++;
1026                 deref = member_expression(symbol, '.', member);
1027                 if (tmp->type == EXPR_INITIALIZER) {
1028                         type = get_type(deref);
1029                         if (type && type->type == SYM_ARRAY)
1030                                 fake_element_assigns_helper(deref, tmp->expr_list, fake_cb);
1031                         else
1032                                 fake_member_assigns_helper(deref, tmp->expr_list, fake_cb);
1033                 } else {
1034                         assign = assign_expression(deref, tmp);
1035                         fake_cb(assign);
1036                 }
1037         } END_FOR_EACH_PTR(tmp);
1038
1039         set_unset_to_zero(symbol, struct_type, member_set);
1040 }
1041
1042 static void fake_member_assigns(struct symbol *sym, fake_cb *fake_cb)
1043 {
1044         fake_member_assigns_helper(symbol_expression(sym),
1045                                    sym->initializer->expr_list, fake_cb);
1046 }
1047
1048 static void fake_element_assigns_helper(struct expression *array, struct expression_list *expr_list, fake_cb *fake_cb)
1049 {
1050         struct expression *offset, *binop, *assign, *tmp;
1051         struct symbol *type;
1052         int idx;
1053
1054         idx = 0;
1055         FOR_EACH_PTR(expr_list, tmp) {
1056                 if (tmp->type == EXPR_INDEX) {
1057                         if (tmp->idx_from != tmp->idx_to)
1058                                 return;
1059                         idx = tmp->idx_from;
1060                         if (!tmp->idx_expression)
1061                                 goto next;
1062                         tmp = tmp->idx_expression;
1063                 }
1064                 offset = value_expr(idx);
1065                 binop = array_element_expression(array, offset);
1066                 if (tmp->type == EXPR_INITIALIZER) {
1067                         type = get_type(binop);
1068                         if (type && type->type == SYM_ARRAY)
1069                                 fake_element_assigns_helper(binop, tmp->expr_list, fake_cb);
1070                         else
1071                                 fake_member_assigns_helper(binop, tmp->expr_list, fake_cb);
1072                 } else {
1073                         assign = assign_expression(binop, tmp);
1074                         fake_cb(assign);
1075                 }
1076 next:
1077                 idx++;
1078         } END_FOR_EACH_PTR(tmp);
1079 }
1080
1081 static void fake_element_assigns(struct symbol *sym, fake_cb *fake_cb)
1082 {
1083         fake_element_assigns_helper(symbol_expression(sym), sym->initializer->expr_list, fake_cb);
1084 }
1085
1086 static void fake_assign_expr(struct symbol *sym)
1087 {
1088         struct expression *assign, *symbol;
1089
1090         symbol = symbol_expression(sym);
1091         assign = assign_expression(symbol, sym->initializer);
1092         __split_expr(assign);
1093 }
1094
1095 static void call_split_expr(struct expression *expr)
1096 {
1097         __split_expr(expr);
1098 }
1099
1100 static void do_initializer_stuff(struct symbol *sym)
1101 {
1102         if (!sym->initializer)
1103                 return;
1104
1105         if (sym->initializer->type == EXPR_INITIALIZER) {
1106                 if (get_real_base_type(sym)->type == SYM_ARRAY)
1107                         fake_element_assigns(sym, call_split_expr);
1108                 else
1109                         fake_member_assigns(sym, call_split_expr);
1110         } else {
1111                 fake_assign_expr(sym);
1112         }
1113 }
1114
1115 static void split_declaration(struct symbol_list *sym_list)
1116 {
1117         struct symbol *sym;
1118
1119         FOR_EACH_PTR(sym_list, sym) {
1120                 __pass_to_client(sym, DECLARATION_HOOK);
1121                 do_initializer_stuff(sym);
1122                 split_sym(sym);
1123         } END_FOR_EACH_PTR(sym);
1124 }
1125
1126 static void call_global_assign_hooks(struct expression *assign)
1127 {
1128         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1129 }
1130
1131 static void fake_global_assign(struct symbol *sym)
1132 {
1133         struct expression *assign, *symbol;
1134
1135         if (get_real_base_type(sym)->type == SYM_ARRAY) {
1136                 if (sym->initializer && sym->initializer->type == EXPR_INITIALIZER) {
1137                         fake_element_assigns(sym, call_global_assign_hooks);
1138                 } else if (sym->initializer) {
1139                         symbol = symbol_expression(sym);
1140                         assign = assign_expression(symbol, sym->initializer);
1141                         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1142                 } else {
1143                         fake_element_assigns_helper(symbol_expression(sym), NULL, call_global_assign_hooks);
1144                 }
1145         } else if (get_real_base_type(sym)->type == SYM_STRUCT) {
1146                 if (sym->initializer && sym->initializer->type == EXPR_INITIALIZER) {
1147                         fake_member_assigns(sym, call_global_assign_hooks);
1148                 } else if (sym->initializer) {
1149                         symbol = symbol_expression(sym);
1150                         assign = assign_expression(symbol, sym->initializer);
1151                         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1152                 } else {
1153                         fake_member_assigns_helper(symbol_expression(sym), NULL, call_global_assign_hooks);
1154                 }
1155         } else {
1156                 symbol = symbol_expression(sym);
1157                 if (sym->initializer)
1158                         assign = assign_expression(symbol, sym->initializer);
1159                 else
1160                         assign = assign_expression(symbol, zero_expr());
1161                 __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1162         }
1163 }
1164
1165 static void start_function_definition(struct symbol *sym)
1166 {
1167         __in_function_def = 1;
1168         __pass_to_client(sym, FUNC_DEF_HOOK);
1169         __in_function_def = 0;
1170         __pass_to_client(sym, AFTER_DEF_HOOK);
1171
1172 }
1173
1174 static void split_function(struct symbol *sym)
1175 {
1176         struct symbol *base_type = get_base_type(sym);
1177
1178         if (!base_type->stmt && !base_type->inline_stmt)
1179                 return;
1180
1181         gettimeofday(&fn_start_time, NULL);
1182         cur_func_sym = sym;
1183         if (sym->ident)
1184                 cur_func = sym->ident->name;
1185         __smatch_lineno = sym->pos.line;
1186         loop_count = 0;
1187         last_goto_statement_handled = 0;
1188         sm_debug("new function:  %s\n", cur_func);
1189         __stree_id = 0;
1190         if (option_two_passes) {
1191                 __unnullify_path();
1192                 loop_num = 0;
1193                 final_pass = 0;
1194                 start_function_definition(sym);
1195                 __split_stmt(base_type->stmt);
1196                 __split_stmt(base_type->inline_stmt);
1197                 nullify_path();
1198         }
1199         __unnullify_path();
1200         loop_num = 0;
1201         final_pass = 1;
1202         start_function_definition(sym);
1203         __split_stmt(base_type->stmt);
1204         __split_stmt(base_type->inline_stmt);
1205         __pass_to_client(sym, END_FUNC_HOOK);
1206         __pass_to_client(sym, AFTER_FUNC_HOOK);
1207
1208         cur_func_sym = NULL;
1209         cur_func = NULL;
1210         clear_all_states();
1211         free_data_info_allocs();
1212         free_expression_stack(&switch_expr_stack);
1213         __free_ptr_list((struct ptr_list **)&big_statement_stack);
1214         __bail_on_rest_of_function = 0;
1215 }
1216
1217 static void parse_inline(struct expression *call)
1218 {
1219         struct symbol *base_type;
1220         int loop_num_bak = loop_num;
1221         int final_pass_bak = final_pass;
1222         char *cur_func_bak = cur_func;
1223         struct statement_list *big_statement_stack_bak = big_statement_stack;
1224         struct expression_list *big_expression_stack_bak = big_expression_stack;
1225         struct expression_list *switch_expr_stack_bak = switch_expr_stack;
1226         struct symbol *cur_func_sym_bak = cur_func_sym;
1227
1228         __pass_to_client(call, INLINE_FN_START);
1229         final_pass = 0;  /* don't print anything */
1230         __inline_fn = call;
1231
1232         base_type = get_base_type(call->fn->symbol);
1233         cur_func_sym = call->fn->symbol;
1234         if (call->fn->symbol->ident)
1235                 cur_func = call->fn->symbol->ident->name;
1236         else
1237                 cur_func = NULL;
1238         set_position(call->fn->symbol->pos);
1239
1240         save_all_states();
1241         big_statement_stack = NULL;
1242         big_expression_stack = NULL;
1243         switch_expr_stack = NULL;
1244
1245         sm_debug("inline function:  %s\n", cur_func);
1246         __unnullify_path();
1247         loop_num = 0;
1248         start_function_definition(call->fn->symbol);
1249         __split_stmt(base_type->stmt);
1250         __split_stmt(base_type->inline_stmt);
1251         __pass_to_client(call->fn->symbol, END_FUNC_HOOK);
1252         __pass_to_client(call->fn->symbol, AFTER_FUNC_HOOK);
1253
1254         free_expression_stack(&switch_expr_stack);
1255         __free_ptr_list((struct ptr_list **)&big_statement_stack);
1256         nullify_path();
1257         free_goto_stack();
1258
1259         loop_num = loop_num_bak;
1260         final_pass = final_pass_bak;
1261         cur_func_sym = cur_func_sym_bak;
1262         cur_func = cur_func_bak;
1263         big_statement_stack = big_statement_stack_bak;
1264         big_expression_stack = big_expression_stack_bak;
1265         switch_expr_stack = switch_expr_stack_bak;
1266
1267         restore_all_states();
1268         set_position(call->pos);
1269         __inline_fn = NULL;
1270         __pass_to_client(call, INLINE_FN_END);
1271 }
1272
1273 static struct symbol_list *inlines_called;
1274 static void add_inline_function(struct symbol *sym)
1275 {
1276         static struct symbol_list *already_added;
1277         struct symbol *tmp;
1278
1279         FOR_EACH_PTR(already_added, tmp) {
1280                 if (tmp == sym)
1281                         return;
1282         } END_FOR_EACH_PTR(tmp);
1283
1284         add_ptr_list(&already_added, sym);
1285         add_ptr_list(&inlines_called, sym);
1286 }
1287
1288 static void process_inlines(void)
1289 {
1290         struct symbol *tmp;
1291
1292         FOR_EACH_PTR(inlines_called, tmp) {
1293                 split_function(tmp);
1294         } END_FOR_EACH_PTR(tmp);
1295         free_ptr_list(&inlines_called);
1296 }
1297
1298 static struct symbol *get_last_scoped_symbol(struct symbol_list *big_list, int use_static)
1299 {
1300         struct symbol *sym;
1301
1302         FOR_EACH_PTR_REVERSE(big_list, sym) {
1303                 if (!sym->scope)
1304                         continue;
1305                 if (use_static && sym->ctype.modifiers & MOD_STATIC)
1306                         return sym;
1307                 if (!use_static && !(sym->ctype.modifiers & MOD_STATIC))
1308                         return sym;
1309         } END_FOR_EACH_PTR_REVERSE(sym);
1310
1311         return NULL;
1312 }
1313
1314 static void split_inlines_in_scope(struct symbol *sym)
1315 {
1316         struct symbol *base;
1317         struct symbol_list *scope_list;
1318         int stream;
1319
1320         scope_list = sym->scope->symbols;
1321         stream = sym->pos.stream;
1322
1323         /* find the last static symbol in the file */
1324         FOR_EACH_PTR_REVERSE(scope_list, sym) {
1325                 if (sym->pos.stream != stream)
1326                         continue;
1327                 if (sym->type != SYM_NODE)
1328                         continue;
1329                 base = get_base_type(sym);
1330                 if (!base)
1331                         continue;
1332                 if (base->type != SYM_FN)
1333                         continue;
1334                 if (!base->inline_stmt)
1335                         continue;
1336                 add_inline_function(sym);
1337         } END_FOR_EACH_PTR_REVERSE(sym);
1338
1339         process_inlines();
1340 }
1341
1342 static void split_inlines(struct symbol_list *sym_list)
1343 {
1344         struct symbol *sym;
1345
1346         sym = get_last_scoped_symbol(sym_list, 0);
1347         if (sym)
1348                 split_inlines_in_scope(sym);
1349         sym = get_last_scoped_symbol(sym_list, 1);
1350         if (sym)
1351                 split_inlines_in_scope(sym);
1352 }
1353
1354 static struct stree *clone_estates_perm(struct stree *orig)
1355 {
1356         struct stree *ret = NULL;
1357         struct sm_state *tmp;
1358
1359         FOR_EACH_SM(orig, tmp) {
1360                 set_state_stree_perm(&ret, tmp->owner, tmp->name, tmp->sym, clone_estate_perm(tmp->state));
1361         } END_FOR_EACH_SM(tmp);
1362
1363         return ret;
1364 }
1365
1366 static void split_functions(struct symbol_list *sym_list)
1367 {
1368         struct symbol *sym;
1369
1370         __unnullify_path();
1371         FOR_EACH_PTR(sym_list, sym) {
1372                 set_position(sym->pos);
1373                 if (sym->type != SYM_NODE || get_base_type(sym)->type != SYM_FN) {
1374                         __pass_to_client(sym, BASE_HOOK);
1375                         fake_global_assign(sym);
1376                 }
1377         } END_FOR_EACH_PTR(sym);
1378         global_states = clone_estates_perm(get_all_states_stree(SMATCH_EXTRA));
1379         nullify_path();
1380
1381         FOR_EACH_PTR(sym_list, sym) {
1382                 set_position(sym->pos);
1383                 if (sym->type == SYM_NODE && get_base_type(sym)->type == SYM_FN) {
1384                         split_function(sym);
1385                         process_inlines();
1386                 }
1387         } END_FOR_EACH_PTR(sym);
1388         split_inlines(sym_list);
1389         __pass_to_client(sym_list, END_FILE_HOOK);
1390 }
1391
1392 void smatch(int argc, char **argv)
1393 {
1394
1395         struct string_list *filelist = NULL;
1396         struct symbol_list *sym_list;
1397
1398         if (argc < 2) {
1399                 printf("Usage:  smatch [--debug] <filename.c>\n");
1400                 exit(1);
1401         }
1402         sparse_initialize(argc, argv, &filelist);
1403         set_valid_ptr_max();
1404         FOR_EACH_PTR_NOTAG(filelist, base_file) {
1405                 if (option_file_output) {
1406                         char buf[256];
1407
1408                         snprintf(buf, sizeof(buf), "%s.smatch", base_file);
1409                         sm_outfd = fopen(buf, "w");
1410                         if (!sm_outfd) {
1411                                 printf("Error:  Cannot open %s\n", base_file);
1412                                 exit(1);
1413                         }
1414                 }
1415                 sym_list = sparse_keep_tokens(base_file);
1416                 split_functions(sym_list);
1417         } END_FOR_EACH_PTR_NOTAG(base_file);
1418 }