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 = 2117777777;
  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 = 2117777777;
  86         else if (type_bits(&ptr_ctype) == 64)
  87                 valid_ptr_max = 2117777777777777777LL;
  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 int is_assigned_call(struct expression *expr)
 139 {
 140         struct expression *tmp;
 141
 142         FOR_EACH_PTR_REVERSE(big_expression_stack, tmp) {
 143                 if (tmp->type == EXPR_ASSIGNMENT && tmp->op == '=' &&
 144                     strip_expr(tmp->right) == expr)
 145                         return 1;
 146                 if (tmp->pos.line < expr->pos.line)
 147                         return 0;
 148         } END_FOR_EACH_PTR_REVERSE(tmp);
 149         return 0;
 150 }
 151
 152 static int is_inline_func(struct expression *expr)
 153 {
 154         if (expr->type != EXPR_SYMBOL || !expr->symbol)
 155                 return 0;
 156         if (expr->symbol->ctype.modifiers & MOD_INLINE)
 157                 return 1;
 158         return 0;
 159 }
 160
 161 static int is_noreturn_func(struct expression *expr)
 162 {
 163         if (expr->type != EXPR_SYMBOL || !expr->symbol)
 164                 return 0;
 165         if (expr->symbol->ctype.modifiers & MOD_NORETURN)
 166                 return 1;
 167         return 0;
 168 }
 169
 170 int inlinable(struct expression *expr)
 171 {
 172         struct symbol *sym;
 173
 174         if (__inline_fn)  /* don't nest */
 175                 return 0;
 176
 177         if (expr->type != EXPR_SYMBOL || !expr->symbol)
 178                 return 0;
 179         if (is_no_inline_function(expr->symbol->ident->name))
 180                 return 0;
 181         sym = get_base_type(expr->symbol);
 182         if (sym->stmt && sym->stmt->type == STMT_COMPOUND) {
 183                 if (ptr_list_size((struct ptr_list *)sym->stmt->stmts) <= 10)
 184                         return 1;
 185                 return 0;
 186         }
 187         if (sym->inline_stmt && sym->inline_stmt->type == STMT_COMPOUND) {
 188                 if (ptr_list_size((struct ptr_list *)sym->inline_stmt->stmts) <= 10)
 189                         return 1;
 190                 return 0;
 191         }
 192         return 0;
 193 }
 194
 195 void __process_post_op_stack(void)
 196 {
 197         struct expression *expr;
 198
 199         FOR_EACH_PTR(post_op_stack, expr) {
 200                 __pass_to_client(expr, OP_HOOK);
 201         } END_FOR_EACH_PTR(expr);
 202
 203         __free_ptr_list((struct ptr_list **)&post_op_stack);
 204 }
 205
 206 static int handle_comma_assigns(struct expression *expr)
 207 {
 208         struct expression *right;
 209         struct expression *assign;
 210
 211         right = strip_expr(expr->right);
 212         if (right->type != EXPR_COMMA)
 213                 return 0;
 214
 215         __split_expr(right->left);
 216         __process_post_op_stack();
 217
 218         assign = assign_expression(expr->left, right->right);
 219         __split_expr(assign);
 220
 221         return 1;
 222 }
 223
 224 void __split_expr(struct expression *expr)
 225 {
 226         if (!expr)
 227                 return;
 228
 229         // sm_msg(" Debug expr_type %d %s", expr->type, show_special(expr->op));
 230
 231         if (__in_fake_assign && expr->type != EXPR_ASSIGNMENT)
 232                 return;
 233         if (__in_fake_assign >= 4)  /* don't allow too much nesting */
 234                 return;
 235
 236         push_expression(&big_expression_stack, expr);
 237         set_position(expr->pos);
 238         __pass_to_client(expr, EXPR_HOOK);
 239
 240         switch (expr->type) {
 241         case EXPR_PREOP:
 242                 if (expr->op == '*')
 243                         __pass_to_client(expr, DEREF_HOOK);
 244                 __split_expr(expr->unop);
 245                 __pass_to_client(expr, OP_HOOK);
 246                 break;
 247         case EXPR_POSTOP:
 248                 __split_expr(expr->unop);
 249                 push_expression(&post_op_stack, expr);
 250                 break;
 251         case EXPR_STATEMENT:
 252                 __expr_stmt_count++;
 253                 __split_stmt(expr->statement);
 254                 __expr_stmt_count--;
 255                 break;
 256         case EXPR_LOGICAL:
 257         case EXPR_COMPARE:
 258                 __pass_to_client(expr, LOGIC_HOOK);
 259                 __handle_logic(expr);
 260                 break;
 261         case EXPR_BINOP:
 262                 __pass_to_client(expr, BINOP_HOOK);
 263         case EXPR_COMMA:
 264                 __split_expr(expr->left);
 265                 __process_post_op_stack();
 266                 __split_expr(expr->right);
 267                 break;
 268         case EXPR_ASSIGNMENT: {
 269                 struct expression *tmp;
 270
 271                 if (!expr->right)
 272                         break;
 273
 274                 __pass_to_client(expr, RAW_ASSIGNMENT_HOOK);
 275
 276                 /* foo = !bar() */
 277                 if (__handle_condition_assigns(expr))
 278                         break;
 279                 /* foo = (x < 5 ? foo : 5); */
 280                 if (__handle_select_assigns(expr))
 281                         break;
 282                 /* foo = ({frob(); frob(); frob(); 1;}) */
 283                 if (__handle_expr_statement_assigns(expr))
 284                         break;
 285                 /* foo = (3, 4); */
 286                 if (handle_comma_assigns(expr))
 287                         break;
 288
 289                 __split_expr(expr->right);
 290                 if (outside_of_function())
 291                         __pass_to_client(expr, GLOBAL_ASSIGNMENT_HOOK);
 292                 else
 293                         __pass_to_client(expr, ASSIGNMENT_HOOK);
 294
 295                 __fake_struct_member_assignments(expr);
 296
 297                 tmp = strip_expr(expr->right);
 298                 if (expr->op == '=' && tmp->type == EXPR_CALL) {
 299                         __pass_to_client(expr, CALL_ASSIGNMENT_HOOK);
 300                         if (!is_fake_call(tmp))
 301                                 __pass_to_client(tmp, FUNCTION_CALL_HOOK_AFTER);
 302                 }
 303                 if (get_macro_name(tmp->pos) &&
 304                     get_macro_name(expr->pos) != get_macro_name(tmp->pos))
 305                         __pass_to_client(expr, MACRO_ASSIGNMENT_HOOK);
 306                 __split_expr(expr->left);
 307                 break;
 308         }
 309         case EXPR_DEREF:
 310                 __pass_to_client(expr, DEREF_HOOK);
 311                 __split_expr(expr->deref);
 312                 break;
 313         case EXPR_SLICE:
 314                 __split_expr(expr->base);
 315                 break;
 316         case EXPR_CAST:
 317         case EXPR_FORCE_CAST:
 318                 __pass_to_client(expr, CAST_HOOK);
 319                 __split_expr(expr->cast_expression);
 320                 break;
 321         case EXPR_SIZEOF:
 322                 if (expr->cast_expression)
 323                         __pass_to_client(strip_parens(expr->cast_expression),
 324                                          SIZEOF_HOOK);
 325                 break;
 326         case EXPR_OFFSETOF:
 327         case EXPR_ALIGNOF:
 328                 evaluate_expression(expr);
 329                 break;
 330         case EXPR_CONDITIONAL:
 331         case EXPR_SELECT:
 332                 if (known_condition_true(expr->conditional)) {
 333                         __split_expr(expr->cond_true);
 334                         break;
 335                 }
 336                 if (known_condition_false(expr->conditional)) {
 337                         __split_expr(expr->cond_false);
 338                         break;
 339                 }
 340                 __pass_to_client(expr, SELECT_HOOK);
 341                 __split_whole_condition(expr->conditional);
 342                 __split_expr(expr->cond_true);
 343                 __push_true_states();
 344                 __use_false_states();
 345                 __split_expr(expr->cond_false);
 346                 __merge_true_states();
 347                 break;
 348         case EXPR_CALL:
 349                 if (sym_name_is("__builtin_constant_p", expr->fn))
 350                         break;
 351                 split_expr_list(expr->args);
 352                 __split_expr(expr->fn);
 353                 if (is_inline_func(expr->fn))
 354                         add_inline_function(expr->fn->symbol);
 355                 if (inlinable(expr->fn))
 356                         __inline_call = 1;
 357                 __process_post_op_stack();
 358                 __pass_to_client(expr, FUNCTION_CALL_HOOK);
 359                 __inline_call = 0;
 360                 if (inlinable(expr->fn)) {
 361                         parse_inline(expr);
 362                 }
 363                 __pass_to_client(expr, CALL_HOOK_AFTER_INLINE);
 364                 if (!is_assigned_call(expr))
 365                         __pass_to_client(expr, FUNCTION_CALL_HOOK_AFTER);
 366                 if (is_noreturn_func(expr->fn))
 367                         nullify_path();
 368                 break;
 369         case EXPR_INITIALIZER:
 370                 split_expr_list(expr->expr_list);
 371                 break;
 372         case EXPR_IDENTIFIER:
 373                 __split_expr(expr->ident_expression);
 374                 break;
 375         case EXPR_INDEX:
 376                 __split_expr(expr->idx_expression);
 377                 break;
 378         case EXPR_POS:
 379                 __split_expr(expr->init_expr);
 380                 break;
 381         case EXPR_SYMBOL:
 382                 __pass_to_client(expr, SYM_HOOK);
 383                 break;
 384         case EXPR_STRING:
 385                 __pass_to_client(expr, STRING_HOOK);
 386                 break;
 387         default:
 388                 break;
 389         };
 390         pop_expression(&big_expression_stack);
 391 }
 392
 393 static int is_forever_loop(struct statement *stmt)
 394 {
 395         struct expression *expr;
 396
 397         expr = strip_expr(stmt->iterator_pre_condition);
 398         if (!expr)
 399                 expr = stmt->iterator_post_condition;
 400         if (!expr) {
 401                 /* this is a for(;;) loop... */
 402                 return 1;
 403         }
 404
 405         if (expr->type == EXPR_VALUE && expr->value == 1)
 406                 return 1;
 407
 408         return 0;
 409 }
 410
 411 static int loop_num;
 412 static char *get_loop_name(int num)
 413 {
 414         char buf[256];
 415
 416         snprintf(buf, 255, "-loop%d", num);
 417         buf[255] = '\0';
 418         return alloc_sname(buf);
 419 }
 420
 421 /*
 422  * Pre Loops are while and for loops.
 423  */
 424 static void handle_pre_loop(struct statement *stmt)
 425 {
 426         int once_through; /* we go through the loop at least once */
 427         struct sm_state *extra_sm = NULL;
 428         int unchanged = 0;
 429         char *loop_name;
 430         struct stree *stree = NULL;
 431         struct sm_state *sm = NULL;
 432
 433         loop_name = get_loop_name(loop_num);
 434         loop_num++;
 435
 436         __split_stmt(stmt->iterator_pre_statement);
 437
 438         once_through = implied_condition_true(stmt->iterator_pre_condition);
 439
 440         loop_count++;
 441         __push_continues();
 442         __push_breaks();
 443
 444         __merge_gotos(loop_name);
 445
 446         extra_sm = __extra_handle_canonical_loops(stmt, &stree);
 447         __in_pre_condition++;
 448         __pass_to_client(stmt, PRELOOP_HOOK);
 449         __split_whole_condition(stmt->iterator_pre_condition);
 450         __in_pre_condition--;
 451         FOR_EACH_SM(stree, sm) {
 452                 set_state(sm->owner, sm->name, sm->sym, sm->state);
 453         } END_FOR_EACH_SM(sm);
 454         free_stree(&stree);
 455         if (extra_sm)
 456                 extra_sm = get_sm_state(extra_sm->owner, extra_sm->name, extra_sm->sym);
 457
 458         if (option_assume_loops)
 459                 once_through = 1;
 460
 461         __split_stmt(stmt->iterator_statement);
 462         __warn_on_silly_pre_loops();
 463         if (is_forever_loop(stmt)) {
 464                 __merge_continues();
 465                 __save_gotos(loop_name);
 466
 467                 __push_fake_cur_stree();
 468                 __split_stmt(stmt->iterator_post_statement);
 469                 stree = __pop_fake_cur_stree();
 470
 471                 __discard_false_states();
 472                 __use_breaks();
 473
 474                 if (!__path_is_null())
 475                         __merge_stree_into_cur(stree);
 476                 free_stree(&stree);
 477         } else {
 478                 __merge_continues();
 479                 unchanged = __iterator_unchanged(extra_sm);
 480                 __split_stmt(stmt->iterator_post_statement);
 481                 __save_gotos(loop_name);
 482                 __in_pre_condition++;
 483                 __split_whole_condition(stmt->iterator_pre_condition);
 484                 __in_pre_condition--;
 485                 nullify_path();
 486                 __merge_false_states();
 487                 if (once_through)
 488                         __discard_false_states();
 489                 else
 490                         __merge_false_states();
 491
 492                 if (extra_sm && unchanged)
 493                         __extra_pre_loop_hook_after(extra_sm,
 494                                                 stmt->iterator_post_statement,
 495                                                 stmt->iterator_pre_condition);
 496                 __merge_breaks();
 497         }
 498         loop_count--;
 499 }
 500
 501 /*
 502  * Post loops are do {} while();
 503  */
 504 static void handle_post_loop(struct statement *stmt)
 505 {
 506         char *loop_name;
 507
 508         loop_name = get_loop_name(loop_num);
 509         loop_num++;
 510         loop_count++;
 511
 512         __push_continues();
 513         __push_breaks();
 514         __merge_gotos(loop_name);
 515         __split_stmt(stmt->iterator_statement);
 516         __merge_continues();
 517         if (!is_zero(stmt->iterator_post_condition))
 518                 __save_gotos(loop_name);
 519
 520         if (is_forever_loop(stmt)) {
 521                 __use_breaks();
 522         } else {
 523                 __split_whole_condition(stmt->iterator_post_condition);
 524                 __use_false_states();
 525                 __merge_breaks();
 526         }
 527         loop_count--;
 528 }
 529
 530 static int empty_statement(struct statement *stmt)
 531 {
 532         if (!stmt)
 533                 return 0;
 534         if (stmt->type == STMT_EXPRESSION && !stmt->expression)
 535                 return 1;
 536         return 0;
 537 }
 538
 539 static int last_stmt_on_same_line(void)
 540 {
 541         struct statement *stmt;
 542         int i = 0;
 543
 544         FOR_EACH_PTR_REVERSE(big_statement_stack, stmt) {
 545                 if (!i++)
 546                         continue;
 547                 if  (stmt->pos.line == get_lineno())
 548                         return 1;
 549                 return 0;
 550         } END_FOR_EACH_PTR_REVERSE(stmt);
 551         return 0;
 552 }
 553
 554 static void split_asm_constraints(struct expression_list *expr_list)
 555 {
 556         struct expression *expr;
 557         int state = 0;
 558
 559         FOR_EACH_PTR(expr_list, expr) {
 560                 switch (state) {
 561                 case 0: /* identifier */
 562                 case 1: /* constraint */
 563                         state++;
 564                         continue;
 565                 case 2: /* expression */
 566                         state = 0;
 567                         __split_expr(expr);
 568                         continue;
 569                 }
 570         } END_FOR_EACH_PTR(expr);
 571 }
 572
 573 static int is_case_val(struct statement *stmt, sval_t sval)
 574 {
 575         sval_t case_sval;
 576
 577         if (stmt->type != STMT_CASE)
 578                 return 0;
 579         if (!stmt->case_expression) {
 580                 __set_default();
 581                 return 1;
 582         }
 583         if (!get_value(stmt->case_expression, &case_sval))
 584                 return 0;
 585         if (case_sval.value == sval.value)
 586                 return 1;
 587         return 0;
 588 }
 589
 590 static void split_known_switch(struct statement *stmt, sval_t sval)
 591 {
 592         struct statement *tmp;
 593
 594         __split_expr(stmt->switch_expression);
 595
 596         push_expression(&switch_expr_stack, stmt->switch_expression);
 597         __save_switch_states(top_expression(switch_expr_stack));
 598         nullify_path();
 599         __push_default();
 600         __push_breaks();
 601
 602         stmt = stmt->switch_statement;
 603
 604         __push_scope_hooks();
 605         FOR_EACH_PTR(stmt->stmts, tmp) {
 606                 __smatch_lineno = tmp->pos.line;
 607                 if (is_case_val(tmp, sval)) {
 608                         __merge_switches(top_expression(switch_expr_stack),
 609                                          stmt->case_expression);
 610                         __pass_case_to_client(top_expression(switch_expr_stack),
 611                                               stmt->case_expression);
 612                 }
 613                 if (__path_is_null())
 614                         continue;
 615                 __split_stmt(tmp);
 616                 if (__path_is_null()) {
 617                         __set_default();
 618                         goto out;
 619                 }
 620         } END_FOR_EACH_PTR(tmp);
 621 out:
 622         __call_scope_hooks();
 623         if (!__pop_default())
 624                 __merge_switches(top_expression(switch_expr_stack),
 625                                  NULL);
 626         __discard_switches();
 627         __merge_breaks();
 628         pop_expression(&switch_expr_stack);
 629 }
 630
 631 static int taking_too_long(void)
 632 {
 633         int ms;
 634
 635         ms = ms_since(&fn_start_time);
 636         if (ms > 1000 * 60 * 5)  /* five minutes */
 637                 return 1;
 638         return 0;
 639 }
 640
 641 static int is_last_stmt(struct statement *cur_stmt)
 642 {
 643         struct symbol *fn = get_base_type(cur_func_sym);
 644         struct statement *stmt;
 645
 646         if (!fn)
 647                 return 0;
 648         stmt = fn->stmt;
 649         if (!stmt)
 650                 stmt = fn->inline_stmt;
 651         if (!stmt || stmt->type != STMT_COMPOUND)
 652                 return 0;
 653         stmt = last_ptr_list((struct ptr_list *)stmt->stmts);
 654         if (stmt && stmt->type == STMT_LABEL)
 655                 stmt = stmt->label_statement;
 656         if (stmt == cur_stmt)
 657                 return 1;
 658         return 0;
 659 }
 660
 661 static void handle_backward_goto(struct statement *goto_stmt)
 662 {
 663         const char *goto_name, *label_name;
 664         struct statement *func_stmt;
 665         struct symbol *base_type = get_base_type(cur_func_sym);
 666         struct statement *tmp;
 667         int found = 0;
 668
 669         if (!option_info)
 670                 return;
 671         if (last_goto_statement_handled)
 672                 return;
 673         last_goto_statement_handled = 1;
 674
 675         if (!goto_stmt->goto_label ||
 676             goto_stmt->goto_label->type != SYM_LABEL ||
 677             !goto_stmt->goto_label->ident)
 678                 return;
 679         goto_name = goto_stmt->goto_label->ident->name;
 680
 681         func_stmt = base_type->stmt;
 682         if (!func_stmt)
 683                 func_stmt = base_type->inline_stmt;
 684         if (!func_stmt)
 685                 return;
 686         if (func_stmt->type != STMT_COMPOUND)
 687                 return;
 688
 689         FOR_EACH_PTR(func_stmt->stmts, tmp) {
 690                 if (!found) {
 691                         if (tmp->type != STMT_LABEL)
 692                                 continue;
 693                         if (!tmp->label_identifier ||
 694                             tmp->label_identifier->type != SYM_LABEL ||
 695                             !tmp->label_identifier->ident)
 696                                 continue;
 697                         label_name = tmp->label_identifier->ident->name;
 698                         if (strcmp(goto_name, label_name) != 0)
 699                                 continue;
 700                         found = 1;
 701                 }
 702                 __split_stmt(tmp);
 703         } END_FOR_EACH_PTR(tmp);
 704 }
 705
 706 static void fake_a_return(void)
 707 {
 708         struct symbol *return_type;
 709
 710         nullify_path();
 711         __unnullify_path();
 712
 713         return_type = get_real_base_type(cur_func_sym);
 714         return_type = get_real_base_type(return_type);
 715         if (return_type != &void_ctype) {
 716                 __pass_to_client(unknown_value_expression(NULL), RETURN_HOOK);
 717                 nullify_path();
 718         }
 719
 720         __pass_to_client(cur_func_sym, END_FUNC_HOOK);
 721         __pass_to_client(cur_func_sym, AFTER_FUNC_HOOK);
 722 }
 723
 724 void __split_stmt(struct statement *stmt)
 725 {
 726         sval_t sval;
 727
 728         if (!stmt)
 729                 goto out;
 730
 731         if (__bail_on_rest_of_function || out_of_memory() || taking_too_long()) {
 732                 static char *printed = NULL;
 733
 734                 __bail_on_rest_of_function = 1;
 735                 if (printed != cur_func)
 736                         sm_msg("Function too hairy.  Giving up.");
 737                 fake_a_return();
 738                 final_pass = 0;  /* turn off sm_msg() from here */
 739                 printed = cur_func;
 740                 return;
 741         }
 742
 743         add_ptr_list(&big_statement_stack, stmt);
 744         free_expression_stack(&big_expression_stack);
 745         set_position(stmt->pos);
 746         __pass_to_client(stmt, STMT_HOOK);
 747
 748         switch (stmt->type) {
 749         case STMT_DECLARATION:
 750                 split_declaration(stmt->declaration);
 751                 break;
 752         case STMT_RETURN:
 753                 __split_expr(stmt->ret_value);
 754                 __pass_to_client(stmt->ret_value, RETURN_HOOK);
 755                 __process_post_op_stack();
 756                 nullify_path();
 757                 break;
 758         case STMT_EXPRESSION:
 759                 __split_expr(stmt->expression);
 760                 break;
 761         case STMT_COMPOUND: {
 762                 struct statement *tmp;
 763
 764                 __push_scope_hooks();
 765                 FOR_EACH_PTR(stmt->stmts, tmp) {
 766                         __split_stmt(tmp);
 767                 } END_FOR_EACH_PTR(tmp);
 768                 __call_scope_hooks();
 769                 break;
 770         }
 771         case STMT_IF:
 772                 if (known_condition_true(stmt->if_conditional)) {
 773                         __split_stmt(stmt->if_true);
 774                         break;
 775                 }
 776                 if (known_condition_false(stmt->if_conditional)) {
 777                         __split_stmt(stmt->if_false);
 778                         break;
 779                 }
 780                 if (option_known_conditions &&
 781                     implied_condition_true(stmt->if_conditional)) {
 782                         sm_info("this condition is true.");
 783                         __split_stmt(stmt->if_true);
 784                         break;
 785                 }
 786                 if (option_known_conditions &&
 787                     implied_condition_false(stmt->if_conditional)) {
 788                         sm_info("this condition is false.");
 789                         __split_stmt(stmt->if_false);
 790                         break;
 791                 }
 792                 __split_whole_condition(stmt->if_conditional);
 793                 __split_stmt(stmt->if_true);
 794                 if (empty_statement(stmt->if_true) &&
 795                         last_stmt_on_same_line() &&
 796                         !get_macro_name(stmt->if_true->pos))
 797                         sm_msg("warn: if();");
 798                 __push_true_states();
 799                 __use_false_states();
 800                 __split_stmt(stmt->if_false);
 801                 __merge_true_states();
 802                 break;
 803         case STMT_ITERATOR:
 804                 if (stmt->iterator_pre_condition)
 805                         handle_pre_loop(stmt);
 806                 else if (stmt->iterator_post_condition)
 807                         handle_post_loop(stmt);
 808                 else {
 809                         // these are for(;;) type loops.
 810                         handle_pre_loop(stmt);
 811                 }
 812                 break;
 813         case STMT_SWITCH:
 814                 if (get_value(stmt->switch_expression, &sval)) {
 815                         split_known_switch(stmt, sval);
 816                         break;
 817                 }
 818                 __split_expr(stmt->switch_expression);
 819                 push_expression(&switch_expr_stack, stmt->switch_expression);
 820                 __save_switch_states(top_expression(switch_expr_stack));
 821                 nullify_path();
 822                 __push_default();
 823                 __push_breaks();
 824                 __split_stmt(stmt->switch_statement);
 825                 if (!__pop_default())
 826                         __merge_switches(top_expression(switch_expr_stack),
 827                                       NULL);
 828                 __discard_switches();
 829                 __merge_breaks();
 830                 pop_expression(&switch_expr_stack);
 831                 break;
 832         case STMT_CASE:
 833                 __merge_switches(top_expression(switch_expr_stack),
 834                                       stmt->case_expression);
 835                 __pass_case_to_client(top_expression(switch_expr_stack),
 836                                       stmt->case_expression);
 837                 if (!stmt->case_expression)
 838                         __set_default();
 839                 __split_expr(stmt->case_expression);
 840                 __split_expr(stmt->case_to);
 841                 __split_stmt(stmt->case_statement);
 842                 break;
 843         case STMT_LABEL:
 844                 if (stmt->label_identifier &&
 845                     stmt->label_identifier->type == SYM_LABEL &&
 846                     stmt->label_identifier->ident) {
 847                         loop_count |= 0x80000000;
 848                         __merge_gotos(stmt->label_identifier->ident->name);
 849                 }
 850                 __split_stmt(stmt->label_statement);
 851                 break;
 852         case STMT_GOTO:
 853                 __split_expr(stmt->goto_expression);
 854                 if (stmt->goto_label && stmt->goto_label->type == SYM_NODE) {
 855                         if (!strcmp(stmt->goto_label->ident->name, "break")) {
 856                                 __process_breaks();
 857                         } else if (!strcmp(stmt->goto_label->ident->name,
 858                                            "continue")) {
 859                                 __process_continues();
 860                         }
 861                 } else if (stmt->goto_label &&
 862                            stmt->goto_label->type == SYM_LABEL &&
 863                            stmt->goto_label->ident) {
 864                         __save_gotos(stmt->goto_label->ident->name);
 865                 }
 866                 nullify_path();
 867                 if (is_last_stmt(stmt))
 868                         handle_backward_goto(stmt);
 869                 break;
 870         case STMT_NONE:
 871                 break;
 872         case STMT_ASM:
 873                 __pass_to_client(stmt, ASM_HOOK);
 874                 __split_expr(stmt->asm_string);
 875                 split_asm_constraints(stmt->asm_outputs);
 876                 split_asm_constraints(stmt->asm_inputs);
 877                 split_asm_constraints(stmt->asm_clobbers);
 878                 break;
 879         case STMT_CONTEXT:
 880                 break;
 881         case STMT_RANGE:
 882                 __split_expr(stmt->range_expression);
 883                 __split_expr(stmt->range_low);
 884                 __split_expr(stmt->range_high);
 885                 break;
 886         }
 887         __pass_to_client(stmt, STMT_HOOK_AFTER);
 888 out:
 889         __process_post_op_stack();
 890 }
 891
 892 static void split_expr_list(struct expression_list *expr_list)
 893 {
 894         struct expression *expr;
 895
 896         FOR_EACH_PTR(expr_list, expr) {
 897                 __split_expr(expr);
 898                 __process_post_op_stack();
 899         } END_FOR_EACH_PTR(expr);
 900 }
 901
 902 static void split_sym(struct symbol *sym)
 903 {
 904         if (!sym)
 905                 return;
 906         if (!(sym->namespace & NS_SYMBOL))
 907                 return;
 908
 909         __split_stmt(sym->stmt);
 910         __split_expr(sym->array_size);
 911         split_symlist(sym->arguments);
 912         split_symlist(sym->symbol_list);
 913         __split_stmt(sym->inline_stmt);
 914         split_symlist(sym->inline_symbol_list);
 915 }
 916
 917 static void split_symlist(struct symbol_list *sym_list)
 918 {
 919         struct symbol *sym;
 920
 921         FOR_EACH_PTR(sym_list, sym) {
 922                 split_sym(sym);
 923         } END_FOR_EACH_PTR(sym);
 924 }
 925
 926 typedef void (fake_cb)(struct expression *expr);
 927
 928 static int member_to_number(struct expression *expr, struct ident *member)
 929 {
 930         struct symbol *type, *tmp;
 931         char *name;
 932         int i;
 933
 934         if (!member)
 935                 return -1;
 936         name = member->name;
 937
 938         type = get_type(expr);
 939         if (!type || type->type != SYM_STRUCT)
 940                 return -1;
 941
 942         i = -1;
 943         FOR_EACH_PTR(type->symbol_list, tmp) {
 944                 i++;
 945                 if (!tmp->ident)
 946                         continue;
 947                 if (strcmp(name, tmp->ident->name) == 0)
 948                         return i;
 949         } END_FOR_EACH_PTR(tmp);
 950         return -1;
 951 }
 952
 953 static struct ident *number_to_member(struct expression *expr, int num)
 954 {
 955         struct symbol *type, *member;
 956         int i = 0;
 957
 958         type = get_type(expr);
 959         if (!type || type->type != SYM_STRUCT)
 960                 return NULL;
 961
 962         FOR_EACH_PTR(type->symbol_list, member) {
 963                 if (i == num)
 964                         return member->ident;
 965                 i++;
 966         } END_FOR_EACH_PTR(member);
 967         return NULL;
 968 }
 969
 970 static void fake_element_assigns_helper(struct expression *array, struct expression_list *expr_list, fake_cb *fake_cb);
 971
 972 struct member_set {
 973         struct ident *ident;
 974         int set;
 975 };
 976
 977 static struct member_set *alloc_member_set(struct symbol *type)
 978 {
 979         struct member_set *member_set;
 980         struct symbol *member;
 981         int member_count;
 982         int member_idx;
 983
 984         member_count = ptr_list_size((struct ptr_list *)type->symbol_list);
 985         member_set = malloc(member_count * sizeof(*member_set));
 986         member_idx = 0;
 987         FOR_EACH_PTR(type->symbol_list, member) {
 988                 member_set[member_idx].ident = member->ident;
 989                 member_set[member_idx].set = 0;
 990                 member_idx++;
 991         } END_FOR_EACH_PTR(member);
 992
 993         return member_set;
 994 }
 995
 996 static void mark_member_as_set(struct symbol *type, struct member_set *member_set, struct ident *ident)
 997 {
 998         int member_count = ptr_list_size((struct ptr_list *)type->symbol_list);
 999         int i;
1000
1001         for (i = 0; i < member_count; i++) {
1002                 if (member_set[i].ident == ident) {
1003                         member_set[i].set = 1;
1004                         return;
1005                 }
1006         }
1007 //      crap.  this is buggy.
1008 //      sm_msg("internal smatch error in initializer %s.%s", type->ident->name, ident->name);
1009 }
1010
1011 static void set_unset_to_zero(struct expression *symbol, struct symbol *type, struct member_set *member_set)
1012 {
1013         struct expression *deref, *assign;
1014         struct symbol *member, *member_type;
1015         int member_idx;
1016
1017         member_idx = 0;
1018         FOR_EACH_PTR(type->symbol_list, member) {
1019                 if (!member->ident || member_set[member_idx].set) {
1020                         member_idx++;
1021                         continue;
1022                 }
1023                 member_type = get_real_base_type(member);
1024                 if (!member_type || member_type->type == SYM_ARRAY) {
1025                         member_idx++;
1026                         continue;
1027                 }
1028                 /* TODO: this should be handled recursively and not ignored */
1029                 if (member_type->type == SYM_STRUCT || member_type->type == SYM_UNION) {
1030                         member_idx++;
1031                         continue;
1032                 }
1033                 deref = member_expression(symbol, '.', member->ident);
1034                 assign = assign_expression(deref, zero_expr());
1035                 __split_expr(assign);
1036                 member_idx++;
1037         } END_FOR_EACH_PTR(member);
1038
1039 }
1040
1041 static void fake_member_assigns_helper(struct expression *symbol, struct expression_list *members, fake_cb *fake_cb)
1042 {
1043         struct expression *deref, *assign, *tmp;
1044         struct symbol *struct_type, *type;
1045         struct ident *member;
1046         int member_idx;
1047         struct member_set *member_set;
1048
1049         struct_type = get_type(symbol);
1050         if (!struct_type ||
1051             (struct_type->type != SYM_STRUCT && struct_type->type != SYM_UNION))
1052                 return;
1053
1054         member_set = alloc_member_set(struct_type);
1055
1056         member_idx = 0;
1057         FOR_EACH_PTR(members, tmp) {
1058                 member = number_to_member(symbol, member_idx);
1059                 while (tmp->type == EXPR_IDENTIFIER) {
1060                         member = tmp->expr_ident;
1061                         member_idx = member_to_number(symbol, member);
1062                         tmp = tmp->ident_expression;
1063                 }
1064                 mark_member_as_set(struct_type, member_set, member);
1065                 member_idx++;
1066                 deref = member_expression(symbol, '.', member);
1067                 if (tmp->type == EXPR_INITIALIZER) {
1068                         type = get_type(deref);
1069                         if (type && type->type == SYM_ARRAY)
1070                                 fake_element_assigns_helper(deref, tmp->expr_list, fake_cb);
1071                         else
1072                                 fake_member_assigns_helper(deref, tmp->expr_list, fake_cb);
1073                 } else {
1074                         assign = assign_expression(deref, tmp);
1075                         fake_cb(assign);
1076                 }
1077         } END_FOR_EACH_PTR(tmp);
1078
1079         set_unset_to_zero(symbol, struct_type, member_set);
1080 }
1081
1082 static void fake_member_assigns(struct symbol *sym, fake_cb *fake_cb)
1083 {
1084         fake_member_assigns_helper(symbol_expression(sym),
1085                                    sym->initializer->expr_list, fake_cb);
1086 }
1087
1088 static void fake_element_assigns_helper(struct expression *array, struct expression_list *expr_list, fake_cb *fake_cb)
1089 {
1090         struct expression *offset, *binop, *assign, *tmp;
1091         struct symbol *type;
1092         int idx;
1093
1094         idx = 0;
1095         FOR_EACH_PTR(expr_list, tmp) {
1096                 if (tmp->type == EXPR_INDEX) {
1097                         if (tmp->idx_from != tmp->idx_to)
1098                                 return;
1099                         idx = tmp->idx_from;
1100                         if (!tmp->idx_expression)
1101                                 goto next;
1102                         tmp = tmp->idx_expression;
1103                 }
1104                 offset = value_expr(idx);
1105                 binop = array_element_expression(array, offset);
1106                 if (tmp->type == EXPR_INITIALIZER) {
1107                         type = get_type(binop);
1108                         if (type && type->type == SYM_ARRAY)
1109                                 fake_element_assigns_helper(binop, tmp->expr_list, fake_cb);
1110                         else
1111                                 fake_member_assigns_helper(binop, tmp->expr_list, fake_cb);
1112                 } else {
1113                         assign = assign_expression(binop, tmp);
1114                         fake_cb(assign);
1115                 }
1116 next:
1117                 idx++;
1118         } END_FOR_EACH_PTR(tmp);
1119 }
1120
1121 static void fake_element_assigns(struct symbol *sym, fake_cb *fake_cb)
1122 {
1123         fake_element_assigns_helper(symbol_expression(sym), sym->initializer->expr_list, fake_cb);
1124 }
1125
1126 static void fake_assign_expr(struct symbol *sym)
1127 {
1128         struct expression *assign, *symbol;
1129
1130         symbol = symbol_expression(sym);
1131         assign = assign_expression(symbol, sym->initializer);
1132         __split_expr(assign);
1133 }
1134
1135 static void call_split_expr(struct expression *expr)
1136 {
1137         __split_expr(expr);
1138 }
1139
1140 static void do_initializer_stuff(struct symbol *sym)
1141 {
1142         if (!sym->initializer)
1143                 return;
1144
1145         if (sym->initializer->type == EXPR_INITIALIZER) {
1146                 if (get_real_base_type(sym)->type == SYM_ARRAY)
1147                         fake_element_assigns(sym, call_split_expr);
1148                 else
1149                         fake_member_assigns(sym, call_split_expr);
1150         } else {
1151                 fake_assign_expr(sym);
1152         }
1153 }
1154
1155 static void split_declaration(struct symbol_list *sym_list)
1156 {
1157         struct symbol *sym;
1158
1159         FOR_EACH_PTR(sym_list, sym) {
1160                 __pass_to_client(sym, DECLARATION_HOOK);
1161                 do_initializer_stuff(sym);
1162                 split_sym(sym);
1163         } END_FOR_EACH_PTR(sym);
1164 }
1165
1166 static void call_global_assign_hooks(struct expression *assign)
1167 {
1168         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1169 }
1170
1171 static void fake_global_assign(struct symbol *sym)
1172 {
1173         struct expression *assign, *symbol;
1174
1175         if (get_real_base_type(sym)->type == SYM_ARRAY) {
1176                 if (sym->initializer && sym->initializer->type == EXPR_INITIALIZER) {
1177                         fake_element_assigns(sym, call_global_assign_hooks);
1178                 } else if (sym->initializer) {
1179                         symbol = symbol_expression(sym);
1180                         assign = assign_expression(symbol, sym->initializer);
1181                         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1182                 } else {
1183                         fake_element_assigns_helper(symbol_expression(sym), NULL, call_global_assign_hooks);
1184                 }
1185         } else if (get_real_base_type(sym)->type == SYM_STRUCT) {
1186                 if (sym->initializer && sym->initializer->type == EXPR_INITIALIZER) {
1187                         fake_member_assigns(sym, call_global_assign_hooks);
1188                 } else if (sym->initializer) {
1189                         symbol = symbol_expression(sym);
1190                         assign = assign_expression(symbol, sym->initializer);
1191                         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1192                 } else {
1193                         fake_member_assigns_helper(symbol_expression(sym), NULL, call_global_assign_hooks);
1194                 }
1195         } else {
1196                 symbol = symbol_expression(sym);
1197                 if (sym->initializer)
1198                         assign = assign_expression(symbol, sym->initializer);
1199                 else
1200                         assign = assign_expression(symbol, zero_expr());
1201                 __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1202         }
1203 }
1204
1205 static void start_function_definition(struct symbol *sym)
1206 {
1207         __in_function_def = 1;
1208         __pass_to_client(sym, FUNC_DEF_HOOK);
1209         __in_function_def = 0;
1210         __pass_to_client(sym, AFTER_DEF_HOOK);
1211
1212 }
1213
1214 static void split_function(struct symbol *sym)
1215 {
1216         struct symbol *base_type = get_base_type(sym);
1217
1218         if (!base_type->stmt && !base_type->inline_stmt)
1219                 return;
1220
1221         gettimeofday(&fn_start_time, NULL);
1222         cur_func_sym = sym;
1223         if (sym->ident)
1224                 cur_func = sym->ident->name;
1225         __smatch_lineno = sym->pos.line;
1226         loop_count = 0;
1227         last_goto_statement_handled = 0;
1228         sm_debug("new function:  %s\n", cur_func);
1229         __stree_id = 0;
1230         if (option_two_passes) {
1231                 __unnullify_path();
1232                 loop_num = 0;
1233                 final_pass = 0;
1234                 start_function_definition(sym);
1235                 __split_stmt(base_type->stmt);
1236                 __split_stmt(base_type->inline_stmt);
1237                 nullify_path();
1238         }
1239         __unnullify_path();
1240         loop_num = 0;
1241         final_pass = 1;
1242         start_function_definition(sym);
1243         __split_stmt(base_type->stmt);
1244         __split_stmt(base_type->inline_stmt);
1245         __pass_to_client(sym, END_FUNC_HOOK);
1246         __pass_to_client(sym, AFTER_FUNC_HOOK);
1247
1248         cur_func_sym = NULL;
1249         cur_func = NULL;
1250         clear_all_states();
1251         free_data_info_allocs();
1252         free_expression_stack(&switch_expr_stack);
1253         __free_ptr_list((struct ptr_list **)&big_statement_stack);
1254         __bail_on_rest_of_function = 0;
1255 }
1256
1257 static void parse_inline(struct expression *call)
1258 {
1259         struct symbol *base_type;
1260         int loop_num_bak = loop_num;
1261         int final_pass_bak = final_pass;
1262         char *cur_func_bak = cur_func;
1263         struct statement_list *big_statement_stack_bak = big_statement_stack;
1264         struct expression_list *big_expression_stack_bak = big_expression_stack;
1265         struct expression_list *switch_expr_stack_bak = switch_expr_stack;
1266         struct symbol *cur_func_sym_bak = cur_func_sym;
1267
1268         __pass_to_client(call, INLINE_FN_START);
1269         final_pass = 0;  /* don't print anything */
1270         __inline_fn = call;
1271
1272         base_type = get_base_type(call->fn->symbol);
1273         cur_func_sym = call->fn->symbol;
1274         if (call->fn->symbol->ident)
1275                 cur_func = call->fn->symbol->ident->name;
1276         else
1277                 cur_func = NULL;
1278         set_position(call->fn->symbol->pos);
1279
1280         save_all_states();
1281         big_statement_stack = NULL;
1282         big_expression_stack = NULL;
1283         switch_expr_stack = NULL;
1284
1285         sm_debug("inline function:  %s\n", cur_func);
1286         __unnullify_path();
1287         loop_num = 0;
1288         start_function_definition(call->fn->symbol);
1289         __split_stmt(base_type->stmt);
1290         __split_stmt(base_type->inline_stmt);
1291         __pass_to_client(call->fn->symbol, END_FUNC_HOOK);
1292         __pass_to_client(call->fn->symbol, AFTER_FUNC_HOOK);
1293
1294         free_expression_stack(&switch_expr_stack);
1295         __free_ptr_list((struct ptr_list **)&big_statement_stack);
1296         nullify_path();
1297         free_goto_stack();
1298
1299         loop_num = loop_num_bak;
1300         final_pass = final_pass_bak;
1301         cur_func_sym = cur_func_sym_bak;
1302         cur_func = cur_func_bak;
1303         big_statement_stack = big_statement_stack_bak;
1304         big_expression_stack = big_expression_stack_bak;
1305         switch_expr_stack = switch_expr_stack_bak;
1306
1307         restore_all_states();
1308         set_position(call->pos);
1309         __inline_fn = NULL;
1310         __pass_to_client(call, INLINE_FN_END);
1311 }
1312
1313 static struct symbol_list *inlines_called;
1314 static void add_inline_function(struct symbol *sym)
1315 {
1316         static struct symbol_list *already_added;
1317         struct symbol *tmp;
1318
1319         FOR_EACH_PTR(already_added, tmp) {
1320                 if (tmp == sym)
1321                         return;
1322         } END_FOR_EACH_PTR(tmp);
1323
1324         add_ptr_list(&already_added, sym);
1325         add_ptr_list(&inlines_called, sym);
1326 }
1327
1328 static void process_inlines(void)
1329 {
1330         struct symbol *tmp;
1331
1332         FOR_EACH_PTR(inlines_called, tmp) {
1333                 split_function(tmp);
1334         } END_FOR_EACH_PTR(tmp);
1335         free_ptr_list(&inlines_called);
1336 }
1337
1338 static struct symbol *get_last_scoped_symbol(struct symbol_list *big_list, int use_static)
1339 {
1340         struct symbol *sym;
1341
1342         FOR_EACH_PTR_REVERSE(big_list, sym) {
1343                 if (!sym->scope)
1344                         continue;
1345                 if (use_static && sym->ctype.modifiers & MOD_STATIC)
1346                         return sym;
1347                 if (!use_static && !(sym->ctype.modifiers & MOD_STATIC))
1348                         return sym;
1349         } END_FOR_EACH_PTR_REVERSE(sym);
1350
1351         return NULL;
1352 }
1353
1354 static void split_inlines_in_scope(struct symbol *sym)
1355 {
1356         struct symbol *base;
1357         struct symbol_list *scope_list;
1358         int stream;
1359
1360         scope_list = sym->scope->symbols;
1361         stream = sym->pos.stream;
1362
1363         /* find the last static symbol in the file */
1364         FOR_EACH_PTR_REVERSE(scope_list, sym) {
1365                 if (sym->pos.stream != stream)
1366                         continue;
1367                 if (sym->type != SYM_NODE)
1368                         continue;
1369                 base = get_base_type(sym);
1370                 if (!base)
1371                         continue;
1372                 if (base->type != SYM_FN)
1373                         continue;
1374                 if (!base->inline_stmt)
1375                         continue;
1376                 add_inline_function(sym);
1377         } END_FOR_EACH_PTR_REVERSE(sym);
1378
1379         process_inlines();
1380 }
1381
1382 static void split_inlines(struct symbol_list *sym_list)
1383 {
1384         struct symbol *sym;
1385
1386         sym = get_last_scoped_symbol(sym_list, 0);
1387         if (sym)
1388                 split_inlines_in_scope(sym);
1389         sym = get_last_scoped_symbol(sym_list, 1);
1390         if (sym)
1391                 split_inlines_in_scope(sym);
1392 }
1393
1394 static struct stree *clone_estates_perm(struct stree *orig)
1395 {
1396         struct stree *ret = NULL;
1397         struct sm_state *tmp;
1398
1399         FOR_EACH_SM(orig, tmp) {
1400                 set_state_stree_perm(&ret, tmp->owner, tmp->name, tmp->sym, clone_estate_perm(tmp->state));
1401         } END_FOR_EACH_SM(tmp);
1402
1403         return ret;
1404 }
1405
1406 static void split_functions(struct symbol_list *sym_list)
1407 {
1408         struct symbol *sym;
1409
1410         __unnullify_path();
1411         FOR_EACH_PTR(sym_list, sym) {
1412                 set_position(sym->pos);
1413                 if (sym->type != SYM_NODE || get_base_type(sym)->type != SYM_FN) {
1414                         __pass_to_client(sym, BASE_HOOK);
1415                         fake_global_assign(sym);
1416                 }
1417         } END_FOR_EACH_PTR(sym);
1418         global_states = clone_estates_perm(get_all_states_stree(SMATCH_EXTRA));
1419         nullify_path();
1420
1421         FOR_EACH_PTR(sym_list, sym) {
1422                 set_position(sym->pos);
1423                 if (sym->type == SYM_NODE && get_base_type(sym)->type == SYM_FN) {
1424                         split_function(sym);
1425                         process_inlines();
1426                 }
1427         } END_FOR_EACH_PTR(sym);
1428         split_inlines(sym_list);
1429         __pass_to_client(sym_list, END_FILE_HOOK);
1430 }
1431
1432 void smatch(int argc, char **argv)
1433 {
1434
1435         struct string_list *filelist = NULL;
1436         struct symbol_list *sym_list;
1437
1438         if (argc < 2) {
1439                 printf("Usage:  smatch [--debug] <filename.c>\n");
1440                 exit(1);
1441         }
1442         sparse_initialize(argc, argv, &filelist);
1443         set_valid_ptr_max();
1444         FOR_EACH_PTR_NOTAG(filelist, base_file) {
1445                 if (option_file_output) {
1446                         char buf[256];
1447
1448                         snprintf(buf, sizeof(buf), "%s.smatch", base_file);
1449                         sm_outfd = fopen(buf, "w");
1450                         if (!sm_outfd) {
1451                                 printf("Error:  Cannot open %s\n", base_file);
1452                                 exit(1);
1453                         }
1454                 }
1455                 sym_list = sparse_keep_tokens(base_file);
1456                 split_functions(sym_list);
1457         } END_FOR_EACH_PTR_NOTAG(base_file);
1458 }