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                 if (!expr->right)
 130                         break;
 131
 132                 __pass_to_client(expr, RAW_ASSIGNMENT_HOOK);
 133
 134                 /* foo = !bar() */
 135                 if (__handle_condition_assigns(expr))
 136                         break;
 137                 /* foo = (x < 5 ? foo : 5); */
 138                 if (__handle_select_assigns(expr))
 139                         break;
 140                 /* foo = ({frob(); frob(); frob(); 1;}) */
 141                 if (__handle_expr_statement_assigns(expr))
 142                         break;
 143
 144                 __split_expr(expr->right);
 145                 __pass_to_client(expr, ASSIGNMENT_HOOK);
 146                 tmp = strip_expr(expr->right);
 147                 if (tmp->type == EXPR_CALL)
 148                         __pass_to_client(expr, CALL_ASSIGNMENT_HOOK);
 149                 if (get_macro_name(&tmp->pos))
 150                         __pass_to_client(expr, MACRO_ASSIGNMENT_HOOK);
 151                 __split_expr(expr->left);
 152                 break;
 153         }
 154         case EXPR_DEREF:
 155                 __pass_to_client(expr, DEREF_HOOK);
 156                 __split_expr(expr->deref);
 157                 break;
 158         case EXPR_SLICE:
 159                 __split_expr(expr->base);
 160                 break;
 161         case EXPR_CAST:
 162         case EXPR_FORCE_CAST:
 163                 __pass_to_client(expr, CAST_HOOK);
 164                 __split_expr(expr->cast_expression);
 165                 break;
 166         case EXPR_SIZEOF:
 167                 /* there isn't anything to pass a client from inside a sizeof() */
 168                 break;
 169         case EXPR_CONDITIONAL:
 170         case EXPR_SELECT:
 171                 __pass_to_client(expr, SELECT_HOOK);
 172                 __split_whole_condition(expr->conditional);
 173                 __split_expr(expr->cond_true);
 174                 __push_true_states();
 175                 __use_false_states();
 176                 __split_expr(expr->cond_false);
 177                 __merge_true_states();
 178                 break;
 179         case EXPR_CALL:
 180                 split_expr_list(expr->args);
 181                 __split_expr(expr->fn);
 182                 if (is_inline_func(expr->fn))
 183                         add_inline_function(expr->fn->symbol);
 184                 __pass_to_client(expr, FUNCTION_CALL_HOOK);
 185                 break;
 186         case EXPR_INITIALIZER:
 187                 split_expr_list(expr->expr_list);
 188                 break;
 189         case EXPR_IDENTIFIER:
 190                 __split_expr(expr->ident_expression);
 191                 break;
 192         case EXPR_INDEX:
 193                 __split_expr(expr->idx_expression);
 194                 break;
 195         case EXPR_POS:
 196                 __split_expr(expr->init_expr);
 197                 break;
 198         case EXPR_SYMBOL:
 199                 __pass_to_client(expr, SYM_HOOK);
 200                 break;
 201         case EXPR_STRING:
 202                 __pass_to_client(expr, STRING_HOOK);
 203                 break;
 204         default:
 205                 break;
 206         };
 207         pop_expression(&big_expression_stack);
 208 }
 209
 210 static int is_forever_loop(struct statement *stmt)
 211 {
 212         struct expression *expr;
 213
 214         expr = strip_expr(stmt->iterator_pre_condition);
 215         if (!expr)
 216                 expr = stmt->iterator_post_condition;
 217         if (!expr) {
 218                 /* this is a for(;;) loop... */
 219                 return 1;
 220         }
 221
 222         if (expr->type == EXPR_VALUE && expr->value == 1)
 223                 return 1;
 224
 225         return 0;
 226 }
 227
 228 static int loop_num;
 229 static char *get_loop_name(int num)
 230 {
 231         char buf[256];
 232
 233         snprintf(buf, 255, "-loop%d", num);
 234         buf[255] = '\0';
 235         return alloc_sname(buf);
 236 }
 237
 238 /*
 239  * Pre Loops are while and for loops.
 240  */
 241 static void handle_pre_loop(struct statement *stmt)
 242 {
 243         int once_through; /* we go through the loop at least once */
 244         struct sm_state *extra_sm = NULL;
 245         int unchanged = 0;
 246         char *loop_name;
 247         struct state_list *slist = NULL;
 248         struct sm_state *sm = NULL;
 249
 250         loop_name = get_loop_name(loop_num);
 251         loop_num++;
 252
 253         __split_stmt(stmt->iterator_pre_statement);
 254
 255         once_through = implied_condition_true(stmt->iterator_pre_condition);
 256
 257         loop_count++;
 258         __push_continues();
 259         __push_breaks();
 260
 261         __merge_gotos(loop_name);
 262
 263         extra_sm = __extra_handle_canonical_loops(stmt, &slist);
 264         __in_pre_condition++;
 265         __pass_to_client(stmt, PRELOOP_HOOK);
 266         __split_whole_condition(stmt->iterator_pre_condition);
 267         __in_pre_condition--;
 268         FOR_EACH_PTR(slist, sm) {
 269                 set_state(sm->owner, sm->name, sm->sym, sm->state);
 270         } END_FOR_EACH_PTR(sm);
 271         free_slist(&slist);
 272         if (extra_sm)
 273                 extra_sm = get_sm_state(extra_sm->owner, extra_sm->name, extra_sm->sym);
 274
 275         if (option_assume_loops)
 276                 once_through = 1;
 277
 278         __split_stmt(stmt->iterator_statement);
 279         __warn_on_silly_pre_loops();
 280         if (is_forever_loop(stmt)) {
 281                 __save_gotos(loop_name);
 282                 /* forever loops don't have an iterator_post_statement */
 283                 __discard_continues();
 284                 __discard_false_states();
 285                 __use_breaks();
 286         } else {
 287                 __merge_continues();
 288                 unchanged = __iterator_unchanged(extra_sm);
 289                 __split_stmt(stmt->iterator_post_statement);
 290                 __save_gotos(loop_name);
 291                 __split_whole_condition(stmt->iterator_pre_condition);
 292                 nullify_path();
 293                 __merge_false_states();
 294                 if (once_through)
 295                         __discard_false_states();
 296                 else
 297                         __merge_false_states();
 298
 299                 if (extra_sm && unchanged)
 300                         __extra_pre_loop_hook_after(extra_sm,
 301                                                 stmt->iterator_post_statement,
 302                                                 stmt->iterator_pre_condition);
 303                 __merge_breaks();
 304         }
 305         loop_count--;
 306 }
 307
 308 /*
 309  * Post loops are do {} while();
 310  */
 311 static void handle_post_loop(struct statement *stmt)
 312 {
 313         char *loop_name;
 314
 315         loop_name = get_loop_name(loop_num);
 316         loop_num++;
 317         loop_count++;
 318
 319         __push_continues();
 320         __push_breaks();
 321         __merge_gotos(loop_name);
 322         __split_stmt(stmt->iterator_statement);
 323         __merge_continues();
 324         if (!is_zero(stmt->iterator_post_condition))
 325                 __save_gotos(loop_name);
 326
 327         if (is_forever_loop(stmt)) {
 328                 __use_breaks();
 329         } else {
 330                 __split_whole_condition(stmt->iterator_post_condition);
 331                 __use_false_states();
 332                 __merge_breaks();
 333         }
 334         loop_count--;
 335 }
 336
 337 static int empty_statement(struct statement *stmt)
 338 {
 339         if (!stmt)
 340                 return 0;
 341         if (stmt->type == STMT_EXPRESSION && !stmt->expression)
 342                 return 1;
 343         return 0;
 344 }
 345
 346 static int last_stmt_on_same_line()
 347 {
 348         struct statement *stmt;
 349         int i = 0;
 350
 351         FOR_EACH_PTR_REVERSE(big_statement_stack, stmt) {
 352                 if (!i++)
 353                         continue;
 354                 if  (stmt->pos.line == get_lineno())
 355                         return 1;
 356                 return 0;
 357         } END_FOR_EACH_PTR_REVERSE(stmt);
 358         return 0;
 359 }
 360
 361 static struct statement *last_stmt;
 362 static int is_last_stmt(struct statement *stmt)
 363 {
 364         if (stmt == last_stmt)
 365                 return 1;
 366         return 0;
 367 }
 368
 369 static void print_unreached_initializers(struct symbol_list *sym_list)
 370 {
 371         struct symbol *sym;
 372
 373         FOR_EACH_PTR(sym_list, sym) {
 374                 if (sym->initializer)
 375                         sm_msg("info: '%s' is not actually initialized (unreached code).",
 376                                 (sym->ident ? sym->ident->name : "this variable"));
 377         } END_FOR_EACH_PTR(sym);
 378 }
 379
 380 static void print_unreached(struct statement *stmt)
 381 {
 382         static int print = 1;
 383
 384         if (!__path_is_null()) {
 385                 print = 1;
 386                 return;
 387         }
 388         if (!print)
 389                 return;
 390
 391         switch (stmt->type) {
 392         case STMT_COMPOUND: /* after a switch before a case stmt */
 393         case STMT_RANGE:
 394         case STMT_CASE:
 395         case STMT_LABEL:
 396                 return;
 397         case STMT_DECLARATION: /* switch (x) { int a; case foo: ... */
 398                 print_unreached_initializers(stmt->declaration);
 399                 return;
 400         case STMT_RETURN: /* gcc complains if you don't have a return statement */
 401                 if (is_last_stmt(stmt))
 402                         return;
 403                 break;
 404         case STMT_GOTO:
 405                 if (!option_spammy)
 406                         return;
 407                 break;
 408         default:
 409                 break;
 410         }
 411         if (!option_spammy && empty_statement(stmt))
 412                 return;
 413         sm_msg("info: ignoring unreachable code.");
 414         print = 0;
 415 }
 416
 417 static void split_asm_constraints(struct expression_list *expr_list)
 418 {
 419         struct expression *expr;
 420         int state = 0;
 421
 422         FOR_EACH_PTR(expr_list, expr) {
 423                 switch (state) {
 424                 case 0: /* identifier */
 425                 case 1: /* constraint */
 426                         state++;
 427                         continue;
 428                 case 2: /* expression */
 429                         state = 0;
 430                         __split_expr(expr);
 431                         continue;
 432                 }
 433         } END_FOR_EACH_PTR(expr);
 434 }
 435
 436 static int is_case_val(struct statement *stmt, long long val)
 437 {
 438         long long case_val;
 439
 440         if (stmt->type != STMT_CASE)
 441                 return 0;
 442         if (!stmt->case_expression) {
 443                 __set_default();
 444                 return 1;
 445         }
 446         if (!get_value(stmt->case_expression, &case_val))
 447                 return 0;
 448         if (case_val == val)
 449                 return 1;
 450         return 0;
 451 }
 452
 453 static void split_known_switch(struct statement *stmt, long long val)
 454 {
 455         struct statement *tmp;
 456
 457         __split_expr(stmt->switch_expression);
 458
 459         push_expression(&switch_expr_stack, stmt->switch_expression);
 460         __save_switch_states(top_expression(switch_expr_stack));
 461         nullify_path();
 462         __push_default();
 463         __push_breaks();
 464
 465         stmt = stmt->switch_statement;
 466
 467         if (!last_stmt)
 468                 last_stmt = last_ptr_list((struct ptr_list *)stmt->stmts);
 469
 470         __push_scope_hooks();
 471         FOR_EACH_PTR(stmt->stmts, tmp) {
 472                 __smatch_lineno = tmp->pos.line;
 473                 if (is_case_val(tmp, val)) {
 474                         __merge_switches(top_expression(switch_expr_stack),
 475                                          stmt->case_expression);
 476                         __pass_case_to_client(top_expression(switch_expr_stack),
 477                                               stmt->case_expression);
 478                 }
 479                 if (__path_is_null())
 480                         continue;
 481                 __split_stmt(tmp);
 482                 if (__path_is_null()) {
 483                         __set_default();
 484                         goto out;
 485                 }
 486         } END_FOR_EACH_PTR(tmp);
 487 out:
 488         __call_scope_hooks();
 489         if (!__pop_default())
 490                 __merge_switches(top_expression(switch_expr_stack),
 491                                  NULL);
 492         __discard_switches();
 493         __merge_breaks();
 494         pop_expression(&switch_expr_stack);
 495 }
 496
 497 void __split_stmt(struct statement *stmt)
 498 {
 499         long long val;
 500
 501         if (!stmt)
 502                 return;
 503
 504         if (out_of_memory() || __bail_on_rest_of_function) {
 505                 static char *printed = NULL;
 506
 507                 if (printed != cur_func)
 508                         sm_msg("Function too hairy.  Giving up.");
 509                 printed = cur_func;
 510                 return;
 511         }
 512
 513         add_ptr_list(&big_statement_stack, stmt);
 514         free_expression_stack(&big_expression_stack);
 515         set_position(stmt->pos);
 516         print_unreached(stmt);
 517         __pass_to_client(stmt, STMT_HOOK);
 518
 519         switch (stmt->type) {
 520         case STMT_DECLARATION:
 521                 split_declaration(stmt->declaration);
 522                 return;
 523         case STMT_RETURN:
 524                 __split_expr(stmt->ret_value);
 525                 __pass_to_client(stmt->ret_value, RETURN_HOOK);
 526                 nullify_path();
 527                 return;
 528         case STMT_EXPRESSION:
 529                 __split_expr(stmt->expression);
 530                 return;
 531         case STMT_COMPOUND: {
 532                 struct statement *tmp;
 533
 534                 if (!last_stmt)
 535                         last_stmt = last_ptr_list((struct ptr_list *)stmt->stmts);
 536                 __push_scope_hooks();
 537                 FOR_EACH_PTR(stmt->stmts, tmp) {
 538                         __split_stmt(tmp);
 539                 } END_FOR_EACH_PTR(tmp);
 540                 __call_scope_hooks();
 541                 return;
 542         }
 543         case STMT_IF:
 544                 if (known_condition_true(stmt->if_conditional)) {
 545                         __split_stmt(stmt->if_true);
 546                         return;
 547                 }
 548                 if (known_condition_false(stmt->if_conditional)) {
 549                         __split_stmt(stmt->if_false);
 550                         return;
 551                 }
 552                 if (option_known_conditions &&
 553                     implied_condition_true(stmt->if_conditional)) {
 554                         sm_info("this condition is true.");
 555                         __split_stmt(stmt->if_true);
 556                         return;
 557                 }
 558                 if (option_known_conditions &&
 559                     implied_condition_false(stmt->if_conditional)) {
 560                         sm_info("this condition is false.");
 561                         __split_stmt(stmt->if_false);
 562                         return;
 563                 }
 564                 __split_whole_condition(stmt->if_conditional);
 565                 __split_stmt(stmt->if_true);
 566                 if (empty_statement(stmt->if_true) &&
 567                         last_stmt_on_same_line() &&
 568                         !get_macro_name(&stmt->if_true->pos))
 569                         sm_msg("warn: if();");
 570                 __push_true_states();
 571                 __use_false_states();
 572                 __split_stmt(stmt->if_false);
 573                 __merge_true_states();
 574                 return;
 575         case STMT_ITERATOR:
 576                 if (stmt->iterator_pre_condition)
 577                         handle_pre_loop(stmt);
 578                 else if (stmt->iterator_post_condition)
 579                         handle_post_loop(stmt);
 580                 else {
 581                         // these are for(;;) type loops.
 582                         handle_pre_loop(stmt);
 583                 }
 584                 return;
 585         case STMT_SWITCH:
 586                 if (get_value(stmt->switch_expression, &val)) {
 587                         split_known_switch(stmt, val);
 588                         return;
 589                 }
 590                 __split_expr(stmt->switch_expression);
 591                 push_expression(&switch_expr_stack, stmt->switch_expression);
 592                 __save_switch_states(top_expression(switch_expr_stack));
 593                 nullify_path();
 594                 __push_default();
 595                 __push_breaks();
 596                 __split_stmt(stmt->switch_statement);
 597                 if (!__pop_default())
 598                         __merge_switches(top_expression(switch_expr_stack),
 599                                       NULL);
 600                 __discard_switches();
 601                 __merge_breaks();
 602                 pop_expression(&switch_expr_stack);
 603                 return;
 604         case STMT_CASE:
 605                 __merge_switches(top_expression(switch_expr_stack),
 606                                       stmt->case_expression);
 607                 __pass_case_to_client(top_expression(switch_expr_stack),
 608                                       stmt->case_expression);
 609                 if (!stmt->case_expression)
 610                         __set_default();
 611                 __split_expr(stmt->case_expression);
 612                 __split_expr(stmt->case_to);
 613                 __split_stmt(stmt->case_statement);
 614                 return;
 615         case STMT_LABEL:
 616                 if (stmt->label_identifier &&
 617                     stmt->label_identifier->type == SYM_LABEL &&
 618                     stmt->label_identifier->ident) {
 619                         loop_count = 1000000;
 620                         __merge_gotos(stmt->label_identifier->ident->name);
 621                 }
 622                 __split_stmt(stmt->label_statement);
 623                 return;
 624         case STMT_GOTO:
 625                 __split_expr(stmt->goto_expression);
 626                 if (stmt->goto_label && stmt->goto_label->type == SYM_NODE) {
 627                         if (!strcmp(stmt->goto_label->ident->name, "break")) {
 628                                 __process_breaks();
 629                         } else if (!strcmp(stmt->goto_label->ident->name,
 630                                            "continue")) {
 631                                 __process_continues();
 632                         }
 633                 } else if (stmt->goto_label &&
 634                            stmt->goto_label->type == SYM_LABEL &&
 635                            stmt->goto_label->ident) {
 636                         __save_gotos(stmt->goto_label->ident->name);
 637                 }
 638                 nullify_path();
 639                 return;
 640         case STMT_NONE:
 641                 return;
 642         case STMT_ASM:
 643                 __pass_to_client(stmt, ASM_HOOK);
 644                 __split_expr(stmt->asm_string);
 645                 split_asm_constraints(stmt->asm_outputs);
 646                 split_asm_constraints(stmt->asm_inputs);
 647                 split_asm_constraints(stmt->asm_clobbers);
 648                 return;
 649         case STMT_CONTEXT:
 650                 return;
 651         case STMT_RANGE:
 652                 __split_expr(stmt->range_expression);
 653                 __split_expr(stmt->range_low);
 654                 __split_expr(stmt->range_high);
 655                 return;
 656         }
 657 }
 658
 659 static void split_expr_list(struct expression_list *expr_list)
 660 {
 661         struct expression *expr;
 662
 663         FOR_EACH_PTR(expr_list, expr) {
 664                 __split_expr(expr);
 665         } END_FOR_EACH_PTR(expr);
 666 }
 667
 668 static void split_sym(struct symbol *sym)
 669 {
 670         if (!sym)
 671                 return;
 672         if (!(sym->namespace & NS_SYMBOL))
 673                 return;
 674
 675         __split_stmt(sym->stmt);
 676         __split_expr(sym->array_size);
 677         split_symlist(sym->arguments);
 678         split_symlist(sym->symbol_list);
 679         __split_stmt(sym->inline_stmt);
 680         split_symlist(sym->inline_symbol_list);
 681 }
 682
 683 static void split_symlist(struct symbol_list *sym_list)
 684 {
 685         struct symbol *sym;
 686
 687         FOR_EACH_PTR(sym_list, sym) {
 688                 split_sym(sym);
 689         } END_FOR_EACH_PTR(sym);
 690 }
 691
 692 static struct expression *fake_assign_expr(struct symbol *sym)
 693 {
 694         struct expression *e_assign, *e_symbol;
 695
 696         e_assign = alloc_expression(sym->initializer->pos, EXPR_ASSIGNMENT);
 697         e_symbol = alloc_expression(sym->pos, EXPR_SYMBOL);
 698         e_assign->op = (int)'=';
 699         e_symbol->symbol = sym;
 700         e_symbol->symbol_name = sym->ident;
 701         e_assign->left = e_symbol;
 702         e_assign->right = sym->initializer;
 703         return e_assign;
 704 }
 705
 706 static void do_initializer_stuff(struct symbol *sym)
 707 {
 708         struct expression *assign;
 709
 710         if (!sym->initializer)
 711                 return;
 712         assign = fake_assign_expr(sym);
 713         __split_expr(assign);
 714 }
 715
 716 static void split_declaration(struct symbol_list *sym_list)
 717 {
 718         struct symbol *sym;
 719
 720         FOR_EACH_PTR(sym_list, sym) {
 721                 __pass_to_client(sym, DECLARATION_HOOK);
 722                 do_initializer_stuff(sym);
 723                 split_sym(sym);
 724         } END_FOR_EACH_PTR(sym);
 725 }
 726
 727 static void split_function(struct symbol *sym)
 728 {
 729         struct symbol *base_type = get_base_type(sym);
 730
 731         cur_func_sym = sym;
 732         if (base_type->stmt)
 733                 line_func_start = base_type->stmt->pos.line;
 734         if (sym->ident)
 735                 cur_func = sym->ident->name;
 736         __smatch_lineno = sym->pos.line;
 737         last_stmt = NULL;
 738         loop_count = 0;
 739         sm_debug("new function:  %s\n", cur_func);
 740         if (option_two_passes) {
 741                 __unnullify_path();
 742                 loop_num = 0;
 743                 final_pass = 0;
 744                 __pass_to_client(sym, FUNC_DEF_HOOK);
 745                 __split_stmt(base_type->stmt);
 746                 __split_stmt(base_type->inline_stmt);
 747                 nullify_path();
 748         }
 749         __unnullify_path();
 750         loop_num = 0;
 751         final_pass = 1;
 752         __pass_to_client(sym, FUNC_DEF_HOOK);
 753         __split_stmt(base_type->stmt);
 754         __split_stmt(base_type->inline_stmt);
 755         __pass_to_client(sym, END_FUNC_HOOK);
 756         cur_func = NULL;
 757         line_func_start = 0;
 758         clear_all_states();
 759         free_data_info_allocs();
 760         free_expression_stack(&switch_expr_stack);
 761         __free_ptr_list((struct ptr_list **)&big_statement_stack);
 762         __bail_on_rest_of_function = 0;
 763 }
 764
 765 static struct symbol_list *inlines_called;
 766 static void add_inline_function(struct symbol *sym)
 767 {
 768         static struct symbol_list *already_added;
 769         struct symbol *tmp;
 770
 771         FOR_EACH_PTR(already_added, tmp) {
 772                 if (tmp == sym)
 773                         return;
 774         } END_FOR_EACH_PTR(tmp);
 775
 776         add_ptr_list(&already_added, sym);
 777         add_ptr_list(&inlines_called, sym);
 778 }
 779
 780 static void process_inlines()
 781 {
 782         struct symbol *tmp;
 783
 784         FOR_EACH_PTR(inlines_called, tmp) {
 785                 split_function(tmp);
 786         } END_FOR_EACH_PTR(tmp);
 787         free_ptr_list(&inlines_called);
 788 }
 789
 790 static void split_functions(struct symbol_list *sym_list)
 791 {
 792         struct symbol *sym;
 793
 794         FOR_EACH_PTR(sym_list, sym) {
 795                 set_position(sym->pos);
 796                 if (sym->type == SYM_NODE && get_base_type(sym)->type == SYM_FN) {
 797                         split_function(sym);
 798                         process_inlines();
 799                 } else {
 800                         __pass_to_client(sym, BASE_HOOK);
 801                 }
 802         } END_FOR_EACH_PTR(sym);
 803         __pass_to_client_no_data(END_FILE_HOOK);
 804 }
 805
 806 void smatch(int argc, char **argv)
 807 {
 808
 809         struct string_list *filelist = NULL;
 810         struct symbol_list *sym_list;
 811         char *file;
 812
 813         if (argc < 2) {
 814                 printf("Usage:  smatch [--debug] <filename.c>\n");
 815                 exit(1);
 816         }
 817         sparse_initialize(argc, argv, &filelist);
 818         FOR_EACH_PTR_NOTAG(filelist, file) {
 819                 if (option_file_output) {
 820                         char buf[256];
 821
 822                         snprintf(buf, sizeof(buf), "%s.smatch", file);
 823                         sm_outfd = fopen(buf, "w");
 824                         if (!sm_outfd) {
 825                                 printf("Error:  Cannot open %s\n", file);
 826                                 exit(1);
 827                         }
 828                 }
 829                 sym_list = sparse_keep_tokens(file);
 830                 split_functions(sym_list);
 831         } END_FOR_EACH_PTR_NOTAG(file);
 832 }