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