smatch_flow.c

   1 /*
   2  * sparse/smatch_flow.c
   3  *
   4  * Copyright (C) 2006,2008 Dan Carpenter.
   5  *
   6  *  Licensed under the Open Software License version 1.1
   7  *
   8  */
   9
  10 #define _GNU_SOURCE 1
  11 #include <unistd.h>
  12 #include <stdio.h>
  13 #include "token.h"
  14 #include "smatch.h"
  15 #include "smatch_expression_stacks.h"
  16 #include "smatch_extra.h"
  17 #include "smatch_slist.h"
  18
  19 int final_pass;
  20
  21 static int __smatch_lineno = 0;
  22
  23 static const char *filename;
  24 static char *pathname;
  25 static char *full_filename;
  26 static char *cur_func;
  27 static int line_func_start;
  28 static int loop_count;
  29 int __expr_stmt_count;
  30 static struct expression_list *switch_expr_stack = NULL;
  31
  32 struct expression_list *big_expression_stack;
  33 struct statement_list *big_statement_stack;
  34 int __in_pre_condition = 0;
  35 int __bail_on_rest_of_function = 0;
  36 char *get_function(void) { return cur_func; }
  37 int get_lineno(void) { return __smatch_lineno; }
  38 int inside_loop(void) { return !!loop_count; }
  39 int in_expression_statement(void) { return !!__expr_stmt_count; }
  40
  41 static void split_symlist(struct symbol_list *sym_list);
  42 static void split_declaration(struct symbol_list *sym_list);
  43 static void split_expr_list(struct expression_list *expr_list);
  44 static void add_inline_function(struct symbol *sym);
  45
  46 int option_assume_loops = 0;
  47 int option_known_conditions = 0;
  48 int option_two_passes = 0;
  49 struct symbol *cur_func_sym = NULL;
  50
  51 const char *get_filename(void)
  52 {
  53         if (option_full_path)
  54                 return full_filename;
  55         return filename;
  56 }
  57
  58 static void set_position(struct position pos)
  59 {
  60         int len;
  61         static int prev_stream = -1;
  62
  63         __smatch_lineno = pos.line;
  64
  65         if (pos.stream == prev_stream)
  66                 return;
  67
  68         filename = stream_name(pos.stream);
  69
  70         free(full_filename);
  71         pathname = getcwd(NULL, 0);
  72         if (pathname) {
  73                 len = strlen(pathname) + 1 + strlen(filename) + 1;
  74                 full_filename = malloc(len);
  75                 snprintf(full_filename, len, "%s/%s", pathname, filename);
  76         } else {
  77                 full_filename = alloc_string(filename);
  78         }
  79         free(pathname);
  80 }
  81
  82 static int is_inline_func(struct expression *expr)
  83 {
  84         if (expr->type != EXPR_SYMBOL || !expr->symbol)
  85                 return 0;
  86         if (expr->symbol->ctype.modifiers & MOD_INLINE)
  87                 return 1;
  88         return 0;
  89 }
  90
  91 void __split_expr(struct expression *expr)
  92 {
  93         if (!expr)
  94                 return;
  95
  96         // sm_msg(" Debug expr_type %d %s", expr->type, show_special(expr->op));
  97
  98         push_expression(&big_expression_stack, expr);
  99         set_position(expr->pos);
 100         __pass_to_client(expr, EXPR_HOOK);
 101
 102         switch (expr->type) {
 103         case EXPR_PREOP:
 104                 if (expr->op == '*')
 105                         __pass_to_client(expr, DEREF_HOOK);
 106         case EXPR_POSTOP:
 107                 __pass_to_client(expr, OP_HOOK);
 108                 __split_expr(expr->unop);
 109                 break;
 110         case EXPR_STATEMENT:
 111                 __expr_stmt_count++;
 112                 __split_stmt(expr->statement);
 113                 __expr_stmt_count--;
 114                 break;
 115         case EXPR_LOGICAL:
 116         case EXPR_COMPARE:
 117                 __pass_to_client(expr, LOGIC_HOOK);
 118                 __handle_logic(expr);
 119                 break;
 120         case EXPR_BINOP:
 121                 __pass_to_client(expr, BINOP_HOOK);
 122         case EXPR_COMMA:
 123                 __split_expr(expr->left);
 124                 __split_expr(expr->right);
 125                 break;
 126         case EXPR_ASSIGNMENT: {
 127                 struct expression *tmp;
 128
 129                 __pass_to_client(expr, RAW_ASSIGNMENT_HOOK);
 130
 131                 /* foo = !bar() */
 132                 if (__handle_condition_assigns(expr))
 133                         break;
 134                 /* foo = (x < 5 ? foo : 5); */
 135                 if (__handle_select_assigns(expr))
 136                         break;
 137                 /* foo = ({frob(); frob(); frob(); 1;}) */
 138                 if (__handle_expr_statement_assigns(expr))
 139                         break;
 140
 141                 __split_expr(expr->right);
 142                 __pass_to_client(expr, ASSIGNMENT_HOOK);
 143                 tmp = strip_expr(expr->right);
 144                 if (tmp->type == EXPR_CALL)
 145                         __pass_to_client(expr, CALL_ASSIGNMENT_HOOK);
 146                 if (get_macro_name(&tmp->pos))
 147                         __pass_to_client(expr, MACRO_ASSIGNMENT_HOOK);
 148                 __split_expr(expr->left);
 149                 break;
 150         }
 151         case EXPR_DEREF:
 152                 __pass_to_client(expr, DEREF_HOOK);
 153                 __split_expr(expr->deref);
 154                 break;
 155         case EXPR_SLICE:
 156                 __split_expr(expr->base);
 157                 break;
 158         case EXPR_CAST:
 159         case EXPR_FORCE_CAST:
 160                 __split_expr(expr->cast_expression);
 161                 break;
 162         case EXPR_SIZEOF:
 163                 /* there isn't anything to pass a client from inside a sizeof() */
 164                 break;
 165         case EXPR_CONDITIONAL:
 166         case EXPR_SELECT:
 167                 __pass_to_client(expr, SELECT_HOOK);
 168                 __split_whole_condition(expr->conditional);
 169                 __split_expr(expr->cond_true);
 170                 __push_true_states();
 171                 __use_false_states();
 172                 __split_expr(expr->cond_false);
 173                 __merge_true_states();
 174                 break;
 175         case EXPR_CALL:
 176                 split_expr_list(expr->args);
 177                 __split_expr(expr->fn);
 178                 if (is_inline_func(expr->fn))
 179                         add_inline_function(expr->fn->symbol);
 180                 __pass_to_client(expr, FUNCTION_CALL_HOOK);
 181                 break;
 182         case EXPR_INITIALIZER:
 183                 split_expr_list(expr->expr_list);
 184                 break;
 185         case EXPR_IDENTIFIER:
 186                 __split_expr(expr->ident_expression);
 187                 break;
 188         case EXPR_INDEX:
 189                 __split_expr(expr->idx_expression);
 190                 break;
 191         case EXPR_POS:
 192                 __split_expr(expr->init_expr);
 193                 break;
 194         case EXPR_SYMBOL:
 195                 __pass_to_client(expr, SYM_HOOK);
 196                 break;
 197         case EXPR_STRING:
 198                 __pass_to_client(expr, STRING_HOOK);
 199                 break;
 200         default:
 201                 break;
 202         };
 203         pop_expression(&big_expression_stack);
 204 }
 205
 206 static int is_forever_loop(struct statement *stmt)
 207 {
 208         struct expression *expr;
 209
 210         expr = strip_expr(stmt->iterator_pre_condition);
 211         if (!expr)
 212                 expr = stmt->iterator_post_condition;
 213         if (!expr) {
 214                 /* this is a for(;;) loop... */
 215                 return 1;
 216         }
 217
 218         if (expr->type == EXPR_VALUE && expr->value == 1)
 219                 return 1;
 220
 221         return 0;
 222 }
 223
 224 static int loop_num;
 225 static char *get_loop_name(int num)
 226 {
 227         char buf[256];
 228
 229         snprintf(buf, 255, "-loop%d", num);
 230         buf[255] = '\0';
 231         return alloc_sname(buf);
 232 }
 233
 234 /*
 235  * Pre Loops are while and for loops.
 236  */
 237 static void handle_pre_loop(struct statement *stmt)
 238 {
 239         int once_through; /* we go through the loop at least once */
 240         struct sm_state *extra_sm = NULL;
 241         int unchanged = 0;
 242         char *loop_name;
 243         struct state_list *slist = NULL;
 244         struct sm_state *sm = NULL;
 245
 246         loop_name = get_loop_name(loop_num);
 247         loop_num++;
 248
 249         __split_stmt(stmt->iterator_pre_statement);
 250
 251         once_through = implied_condition_true(stmt->iterator_pre_condition);
 252
 253         loop_count++;
 254         __push_continues();
 255         __push_breaks();
 256
 257         __merge_gotos(loop_name);
 258
 259         extra_sm = __extra_handle_canonical_loops(stmt, &slist);
 260         __in_pre_condition++;
 261         __pass_to_client(stmt, PRELOOP_HOOK);
 262         __split_whole_condition(stmt->iterator_pre_condition);
 263         __in_pre_condition--;
 264         FOR_EACH_PTR(slist, sm) {
 265                 set_state(sm->owner, sm->name, sm->sym, sm->state);
 266         } END_FOR_EACH_PTR(sm);
 267         free_slist(&slist);
 268         if (extra_sm)
 269                 extra_sm = get_sm_state(extra_sm->owner, extra_sm->name, extra_sm->sym);
 270
 271         if (option_assume_loops)
 272                 once_through = 1;
 273
 274         __split_stmt(stmt->iterator_statement);
 275         __warn_on_silly_pre_loops();
 276         if (is_forever_loop(stmt)) {
 277                 __save_gotos(loop_name);
 278                 /* forever loops don't have an iterator_post_statement */
 279                 __discard_continues();
 280                 __discard_false_states();
 281                 __use_breaks();
 282         } else {
 283                 __merge_continues();
 284                 unchanged = __iterator_unchanged(extra_sm);
 285                 __split_stmt(stmt->iterator_post_statement);
 286                 __save_gotos(loop_name);
 287                 __split_whole_condition(stmt->iterator_pre_condition);
 288                 nullify_path();
 289                 __merge_false_states();
 290                 if (once_through)
 291                         __discard_false_states();
 292                 else
 293                         __merge_false_states();
 294
 295                 if (extra_sm && unchanged)
 296                         __extra_pre_loop_hook_after(extra_sm,
 297                                                 stmt->iterator_post_statement,
 298                                                 stmt->iterator_pre_condition);
 299                 __merge_breaks();
 300         }
 301         loop_count--;
 302 }
 303
 304 /*
 305  * Post loops are do {} while();
 306  */
 307 static void handle_post_loop(struct statement *stmt)
 308 {
 309         char *loop_name;
 310
 311         loop_name = get_loop_name(loop_num);
 312         loop_num++;
 313         loop_count++;
 314
 315         __push_continues();
 316         __push_breaks();
 317         __merge_gotos(loop_name);
 318         __split_stmt(stmt->iterator_statement);
 319         __merge_continues();
 320         if (!is_zero(stmt->iterator_post_condition))
 321                 __save_gotos(loop_name);
 322
 323         if (is_forever_loop(stmt)) {
 324                 __use_breaks();
 325         } else {
 326                 __split_whole_condition(stmt->iterator_post_condition);
 327                 __use_false_states();
 328                 __merge_breaks();
 329         }
 330         loop_count--;
 331 }
 332
 333 static int empty_statement(struct statement *stmt)
 334 {
 335         if (!stmt)
 336                 return 0;
 337         if (stmt->type == STMT_EXPRESSION && !stmt->expression)
 338                 return 1;
 339         return 0;
 340 }
 341
 342 static int last_stmt_on_same_line()
 343 {
 344         struct statement *stmt;
 345         int i = 0;
 346
 347         FOR_EACH_PTR_REVERSE(big_statement_stack, stmt) {
 348                 if (!i++)
 349                         continue;
 350                 if  (stmt->pos.line == get_lineno())
 351                         return 1;
 352                 return 0;
 353         } END_FOR_EACH_PTR_REVERSE(stmt);
 354         return 0;
 355 }
 356
 357 static struct statement *last_stmt;
 358 static int is_last_stmt(struct statement *stmt)
 359 {
 360         if (stmt == last_stmt)
 361                 return 1;
 362         return 0;
 363 }
 364
 365 static void print_unreached_initializers(struct symbol_list *sym_list)
 366 {
 367         struct symbol *sym;
 368
 369         FOR_EACH_PTR(sym_list, sym) {
 370                 if (sym->initializer)
 371                         sm_msg("info: '%s' is not actually initialized (unreached code).",
 372                                 (sym->ident ? sym->ident->name : "this variable"));
 373         } END_FOR_EACH_PTR(sym);
 374 }
 375
 376 static void print_unreached(struct statement *stmt)
 377 {
 378         static int print = 1;
 379
 380         if (!__path_is_null()) {
 381                 print = 1;
 382                 return;
 383         }
 384         if (!print)
 385                 return;
 386
 387         switch (stmt->type) {
 388         case STMT_COMPOUND: /* after a switch before a case stmt */
 389         case STMT_RANGE:
 390         case STMT_CASE:
 391         case STMT_LABEL:
 392                 return;
 393         case STMT_DECLARATION: /* switch (x) { int a; case foo: ... */
 394                 print_unreached_initializers(stmt->declaration);
 395                 return;
 396         case STMT_RETURN: /* gcc complains if you don't have a return statement */
 397                 if (is_last_stmt(stmt))
 398                         return;
 399                 break;
 400         case STMT_GOTO:
 401                 if (!option_spammy)
 402                         return;
 403                 break;
 404         default:
 405                 break;
 406         }
 407         if (!option_spammy && empty_statement(stmt))
 408                 return;
 409         sm_msg("info: ignoring unreachable code.");
 410         print = 0;
 411 }
 412
 413 static void split_asm_constraints(struct expression_list *expr_list)
 414 {
 415         struct expression *expr;
 416         int state = 0;
 417
 418         FOR_EACH_PTR(expr_list, expr) {
 419                 switch (state) {
 420                 case 0: /* identifier */
 421                 case 1: /* constraint */
 422                         state++;
 423                         continue;
 424                 case 2: /* expression */
 425                         state = 0;
 426                         __split_expr(expr);
 427                         continue;
 428                 }
 429         } END_FOR_EACH_PTR(expr);
 430 }
 431
 432 static int is_case_val(struct statement *stmt, long long val)
 433 {
 434         long long case_val;
 435
 436         if (stmt->type != STMT_CASE)
 437                 return 0;
 438         if (!stmt->case_expression) {
 439                 __set_default();
 440                 return 1;
 441         }
 442         if (!get_value(stmt->case_expression, &case_val))
 443                 return 0;
 444         if (case_val == val)
 445                 return 1;
 446         return 0;
 447 }
 448
 449 static void split_known_switch(struct statement *stmt, long long val)
 450 {
 451         struct statement *tmp;
 452
 453         __split_expr(stmt->switch_expression);
 454
 455         push_expression(&switch_expr_stack, stmt->switch_expression);
 456         __save_switch_states(top_expression(switch_expr_stack));
 457         nullify_path();
 458         __push_default();
 459         __push_breaks();
 460
 461         stmt = stmt->switch_statement;
 462
 463         if (!last_stmt)
 464                 last_stmt = last_ptr_list((struct ptr_list *)stmt->stmts);
 465
 466         __push_scope_hooks();
 467         FOR_EACH_PTR(stmt->stmts, tmp) {
 468                 __smatch_lineno = tmp->pos.line;
 469                 if (is_case_val(tmp, val)) {
 470                         __merge_switches(top_expression(switch_expr_stack),
 471                                          stmt->case_expression);
 472                         __pass_case_to_client(top_expression(switch_expr_stack),
 473                                               stmt->case_expression);
 474                 }
 475                 if (__path_is_null())
 476                         continue;
 477                 __split_stmt(tmp);
 478                 if (__path_is_null()) {
 479                         __set_default();
 480                         goto out;
 481                 }
 482         } END_FOR_EACH_PTR(tmp);
 483 out:
 484         __call_scope_hooks();
 485         if (!__pop_default())
 486                 __merge_switches(top_expression(switch_expr_stack),
 487                                  NULL);
 488         __discard_switches();
 489         __merge_breaks();
 490         pop_expression(&switch_expr_stack);
 491 }
 492
 493 void __split_stmt(struct statement *stmt)
 494 {
 495         long long val;
 496
 497         if (!stmt)
 498                 return;
 499
 500         if (out_of_memory() || __bail_on_rest_of_function) {
 501                 static char *printed = NULL;
 502
 503                 if (printed != cur_func)
 504                         sm_msg("Function too hairy.  Giving up.");
 505                 printed = cur_func;
 506                 return;
 507         }
 508
 509         add_ptr_list(&big_statement_stack, stmt);
 510         free_expression_stack(&big_expression_stack);
 511         set_position(stmt->pos);
 512         print_unreached(stmt);
 513         __pass_to_client(stmt, STMT_HOOK);
 514
 515         switch (stmt->type) {
 516         case STMT_DECLARATION:
 517                 split_declaration(stmt->declaration);
 518                 return;
 519         case STMT_RETURN:
 520                 __split_expr(stmt->ret_value);
 521                 __pass_to_client(stmt->ret_value, RETURN_HOOK);
 522                 nullify_path();
 523                 return;
 524         case STMT_EXPRESSION:
 525                 __split_expr(stmt->expression);
 526                 return;
 527         case STMT_COMPOUND: {
 528                 struct statement *tmp;
 529
 530                 if (!last_stmt)
 531                         last_stmt = last_ptr_list((struct ptr_list *)stmt->stmts);
 532                 __push_scope_hooks();
 533                 FOR_EACH_PTR(stmt->stmts, tmp) {
 534                         __split_stmt(tmp);
 535                 } END_FOR_EACH_PTR(tmp);
 536                 __call_scope_hooks();
 537                 return;
 538         }
 539         case STMT_IF:
 540                 if (known_condition_true(stmt->if_conditional)) {
 541                         __split_stmt(stmt->if_true);
 542                         return;
 543                 }
 544                 if (known_condition_false(stmt->if_conditional)) {
 545                         __split_stmt(stmt->if_false);
 546                         return;
 547                 }
 548                 if (option_known_conditions &&
 549                     implied_condition_true(stmt->if_conditional)) {
 550                         sm_info("this condition is true.");
 551                         __split_stmt(stmt->if_true);
 552                         return;
 553                 }
 554                 if (option_known_conditions &&
 555                     implied_condition_false(stmt->if_conditional)) {
 556                         sm_info("this condition is false.");
 557                         __split_stmt(stmt->if_false);
 558                         return;
 559                 }
 560                 __split_whole_condition(stmt->if_conditional);
 561                 __split_stmt(stmt->if_true);
 562                 if (empty_statement(stmt->if_true) &&
 563                         last_stmt_on_same_line() &&
 564                         !get_macro_name(&stmt->if_true->pos))
 565                         sm_msg("warn: if();");
 566                 __push_true_states();
 567                 __use_false_states();
 568                 __split_stmt(stmt->if_false);
 569                 __merge_true_states();
 570                 return;
 571         case STMT_ITERATOR:
 572                 if (stmt->iterator_pre_condition)
 573                         handle_pre_loop(stmt);
 574                 else if (stmt->iterator_post_condition)
 575                         handle_post_loop(stmt);
 576                 else {
 577                         // these are for(;;) type loops.
 578                         handle_pre_loop(stmt);
 579                 }
 580                 return;
 581         case STMT_SWITCH:
 582                 if (get_value(stmt->switch_expression, &val)) {
 583                         split_known_switch(stmt, val);
 584                         return;
 585                 }
 586                 __split_expr(stmt->switch_expression);
 587                 push_expression(&switch_expr_stack, stmt->switch_expression);
 588                 __save_switch_states(top_expression(switch_expr_stack));
 589                 nullify_path();
 590                 __push_default();
 591                 __push_breaks();
 592                 __split_stmt(stmt->switch_statement);
 593                 if (!__pop_default())
 594                         __merge_switches(top_expression(switch_expr_stack),
 595                                       NULL);
 596                 __discard_switches();
 597                 __merge_breaks();
 598                 pop_expression(&switch_expr_stack);
 599                 return;
 600         case STMT_CASE:
 601                 __merge_switches(top_expression(switch_expr_stack),
 602                                       stmt->case_expression);
 603                 __pass_case_to_client(top_expression(switch_expr_stack),
 604                                       stmt->case_expression);
 605                 if (!stmt->case_expression)
 606                         __set_default();
 607                 __split_expr(stmt->case_expression);
 608                 __split_expr(stmt->case_to);
 609                 __split_stmt(stmt->case_statement);
 610                 return;
 611         case STMT_LABEL:
 612                 if (stmt->label_identifier &&
 613                     stmt->label_identifier->type == SYM_LABEL &&
 614                     stmt->label_identifier->ident) {
 615                         loop_count = 1000000;
 616                         __merge_gotos(stmt->label_identifier->ident->name);
 617                 }
 618                 __split_stmt(stmt->label_statement);
 619                 return;
 620         case STMT_GOTO:
 621                 __split_expr(stmt->goto_expression);
 622                 if (stmt->goto_label && stmt->goto_label->type == SYM_NODE) {
 623                         if (!strcmp(stmt->goto_label->ident->name, "break")) {
 624                                 __process_breaks();
 625                         } else if (!strcmp(stmt->goto_label->ident->name,
 626                                            "continue")) {
 627                                 __process_continues();
 628                         }
 629                 } else if (stmt->goto_label &&
 630                            stmt->goto_label->type == SYM_LABEL &&
 631                            stmt->goto_label->ident) {
 632                         __save_gotos(stmt->goto_label->ident->name);
 633                 }
 634                 nullify_path();
 635                 return;
 636         case STMT_NONE:
 637                 return;
 638         case STMT_ASM:
 639                 __pass_to_client(stmt, ASM_HOOK);
 640                 __split_expr(stmt->asm_string);
 641                 split_asm_constraints(stmt->asm_outputs);
 642                 split_asm_constraints(stmt->asm_inputs);
 643                 split_asm_constraints(stmt->asm_clobbers);
 644                 return;
 645         case STMT_CONTEXT:
 646                 return;
 647         case STMT_RANGE:
 648                 __split_expr(stmt->range_expression);
 649                 __split_expr(stmt->range_low);
 650                 __split_expr(stmt->range_high);
 651                 return;
 652         }
 653 }
 654
 655 static void split_expr_list(struct expression_list *expr_list)
 656 {
 657         struct expression *expr;
 658
 659         FOR_EACH_PTR(expr_list, expr) {
 660                 __split_expr(expr);
 661         } END_FOR_EACH_PTR(expr);
 662 }
 663
 664 static void split_sym(struct symbol *sym)
 665 {
 666         if (!sym)
 667                 return;
 668         if (!(sym->namespace & NS_SYMBOL))
 669                 return;
 670
 671         __split_stmt(sym->stmt);
 672         __split_expr(sym->array_size);
 673         split_symlist(sym->arguments);
 674         split_symlist(sym->symbol_list);
 675         __split_stmt(sym->inline_stmt);
 676         split_symlist(sym->inline_symbol_list);
 677 }
 678
 679 static void split_symlist(struct symbol_list *sym_list)
 680 {
 681         struct symbol *sym;
 682
 683         FOR_EACH_PTR(sym_list, sym) {
 684                 split_sym(sym);
 685         } END_FOR_EACH_PTR(sym);
 686 }
 687
 688 static struct expression *fake_assign_expr(struct symbol *sym)
 689 {
 690         struct expression *e_assign, *e_symbol;
 691
 692         e_assign = alloc_expression(sym->initializer->pos, EXPR_ASSIGNMENT);
 693         e_symbol = alloc_expression(sym->pos, EXPR_SYMBOL);
 694         e_assign->op = (int)'=';
 695         e_symbol->symbol = sym;
 696         e_symbol->symbol_name = sym->ident;
 697         e_assign->left = e_symbol;
 698         e_assign->right = sym->initializer;
 699         return e_assign;
 700 }
 701
 702 static void do_initializer_stuff(struct symbol *sym)
 703 {
 704         struct expression *assign;
 705
 706         if (!sym->initializer)
 707                 return;
 708         assign = fake_assign_expr(sym);
 709         __split_expr(assign);
 710 }
 711
 712 static void split_declaration(struct symbol_list *sym_list)
 713 {
 714         struct symbol *sym;
 715
 716         FOR_EACH_PTR(sym_list, sym) {
 717                 __pass_to_client(sym, DECLARATION_HOOK);
 718                 do_initializer_stuff(sym);
 719                 split_sym(sym);
 720         } END_FOR_EACH_PTR(sym);
 721 }
 722
 723 static void split_function(struct symbol *sym)
 724 {
 725         struct symbol *base_type = get_base_type(sym);
 726
 727         cur_func_sym = sym;
 728         if (base_type->stmt)
 729                 line_func_start = base_type->stmt->pos.line;
 730         if (sym->ident)
 731                 cur_func = sym->ident->name;
 732         __smatch_lineno = sym->pos.line;
 733         last_stmt = NULL;
 734         loop_count = 0;
 735         sm_debug("new function:  %s\n", cur_func);
 736         if (option_two_passes) {
 737                 __unnullify_path();
 738                 loop_num = 0;
 739                 final_pass = 0;
 740                 __pass_to_client(sym, FUNC_DEF_HOOK);
 741                 __split_stmt(base_type->stmt);
 742                 __split_stmt(base_type->inline_stmt);
 743                 nullify_path();
 744         }
 745         __unnullify_path();
 746         loop_num = 0;
 747         final_pass = 1;
 748         __pass_to_client(sym, FUNC_DEF_HOOK);
 749         __split_stmt(base_type->stmt);
 750         __split_stmt(base_type->inline_stmt);
 751         __pass_to_client(sym, END_FUNC_HOOK);
 752         cur_func = NULL;
 753         line_func_start = 0;
 754         clear_all_states();
 755         free_data_info_allocs();
 756         free_expression_stack(&switch_expr_stack);
 757         __free_ptr_list((struct ptr_list **)&big_statement_stack);
 758         __bail_on_rest_of_function = 0;
 759 }
 760
 761 static struct symbol_list *inlines_called;
 762 static void add_inline_function(struct symbol *sym)
 763 {
 764         static struct symbol_list *already_added;
 765         struct symbol *tmp;
 766
 767         FOR_EACH_PTR(already_added, tmp) {
 768                 if (tmp == sym)
 769                         return;
 770         } END_FOR_EACH_PTR(tmp);
 771
 772         add_ptr_list(&already_added, sym);
 773         add_ptr_list(&inlines_called, sym);
 774 }
 775
 776 static void process_inlines()
 777 {
 778         struct symbol *tmp;
 779
 780         FOR_EACH_PTR(inlines_called, tmp) {
 781                 split_function(tmp);
 782         } END_FOR_EACH_PTR(tmp);
 783         free_ptr_list(&inlines_called);
 784 }
 785
 786 static void split_functions(struct symbol_list *sym_list)
 787 {
 788         struct symbol *sym;
 789
 790         FOR_EACH_PTR(sym_list, sym) {
 791                 set_position(sym->pos);
 792                 if (sym->type == SYM_NODE && get_base_type(sym)->type == SYM_FN) {
 793                         split_function(sym);
 794                         process_inlines();
 795                 } else {
 796                         __pass_to_client(sym, BASE_HOOK);
 797                 }
 798         } END_FOR_EACH_PTR(sym);
 799         __pass_to_client_no_data(END_FILE_HOOK);
 800 }
 801
 802 void smatch(int argc, char **argv)
 803 {
 804
 805         struct string_list *filelist = NULL;
 806         struct symbol_list *sym_list;
 807         char *file;
 808
 809         if (argc < 2) {
 810                 printf("Usage:  smatch [--debug] <filename.c>\n");
 811                 exit(1);
 812         }
 813         sparse_initialize(argc, argv, &filelist);
 814         FOR_EACH_PTR_NOTAG(filelist, file) {
 815                 if (option_file_output) {
 816                         char buf[256];
 817
 818                         snprintf(buf, sizeof(buf), "%s.smatch", file);
 819                         sm_outfd = fopen(buf, "w");
 820                         if (!sm_outfd) {
 821                                 printf("Error:  Cannot open %s\n", file);
 822                                 exit(1);
 823                         }
 824                 }
 825                 sym_list = sparse_keep_tokens(file);
 826                 split_functions(sym_list);
 827         } END_FOR_EACH_PTR_NOTAG(file);
 828 }