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 position pos)
  60 {
  61         int len;
  62         static int prev_stream = -1;
  63
  64         __smatch_lineno = pos.line;
  65
  66         if (pos.stream == prev_stream)
  67                 return;
  68
  69         filename = stream_name(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->pos);
 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         struct expression *expr;
 210
 211         expr = strip_expr(stmt->iterator_pre_condition);
 212         if (!expr)
 213                 expr = stmt->iterator_post_condition;
 214         if (!expr) {
 215                 /* this is a for(;;) loop... */
 216                 return 1;
 217         }
 218
 219         if (expr->type == EXPR_VALUE && expr->value == 1)
 220                 return 1;
 221
 222         return 0;
 223 }
 224
 225 static int loop_num;
 226 static char *get_loop_name(int num)
 227 {
 228         char buf[256];
 229
 230         snprintf(buf, 255, "-loop%d", num);
 231         buf[255] = '\0';
 232         return alloc_sname(buf);
 233 }
 234
 235 /*
 236  * Pre Loops are while and for loops.
 237  */
 238 static void handle_pre_loop(struct statement *stmt)
 239 {
 240         int once_through; /* we go through the loop at least once */
 241         struct sm_state *extra_sm = NULL;
 242         int unchanged = 0;
 243         char *loop_name;
 244         struct state_list *slist = NULL;
 245         struct sm_state *sm = NULL;
 246
 247         loop_name = get_loop_name(loop_num);
 248         loop_num++;
 249
 250         __split_stmt(stmt->iterator_pre_statement);
 251
 252         once_through = implied_condition_true(stmt->iterator_pre_condition);
 253
 254         loop_count++;
 255         __push_continues();
 256         __push_breaks();
 257
 258         __merge_gotos(loop_name);
 259
 260         extra_sm = __extra_handle_canonical_loops(stmt, &slist);
 261         __in_pre_condition++;
 262         __pass_to_client(stmt, PRELOOP_HOOK);
 263         __split_whole_condition(stmt->iterator_pre_condition);
 264         __in_pre_condition--;
 265         FOR_EACH_PTR(slist, sm) {
 266                 set_state(sm->owner, sm->name, sm->sym, sm->state);
 267         } END_FOR_EACH_PTR(sm);
 268         free_slist(&slist);
 269         if (extra_sm)
 270                 extra_sm = get_sm_state(extra_sm->owner, extra_sm->name, extra_sm->sym);
 271
 272         if (option_assume_loops)
 273                 once_through = 1;
 274
 275         __split_stmt(stmt->iterator_statement);
 276         __warn_on_silly_pre_loops();
 277         if (is_forever_loop(stmt)) {
 278                 __save_gotos(loop_name);
 279                 /* forever loops don't have an iterator_post_statement */
 280                 __discard_continues();
 281                 __discard_false_states();
 282                 __use_breaks();
 283         } else {
 284                 __merge_continues();
 285                 unchanged = __iterator_unchanged(extra_sm);
 286                 __split_stmt(stmt->iterator_post_statement);
 287                 __save_gotos(loop_name);
 288                 __split_whole_condition(stmt->iterator_pre_condition);
 289                 nullify_path();
 290                 __merge_false_states();
 291                 if (once_through)
 292                         __discard_false_states();
 293                 else
 294                         __merge_false_states();
 295
 296                 if (extra_sm && unchanged)
 297                         __extra_pre_loop_hook_after(extra_sm,
 298                                                 stmt->iterator_post_statement,
 299                                                 stmt->iterator_pre_condition);
 300                 __merge_breaks();
 301         }
 302         loop_count--;
 303 }
 304
 305 /*
 306  * Post loops are do {} while();
 307  */
 308 static void handle_post_loop(struct statement *stmt)
 309 {
 310         char *loop_name;
 311
 312         loop_name = get_loop_name(loop_num);
 313         loop_num++;
 314         loop_count++;
 315
 316         __push_continues();
 317         __push_breaks();
 318         __merge_gotos(loop_name);
 319         __split_stmt(stmt->iterator_statement);
 320         __merge_continues();
 321         if (!is_zero(stmt->iterator_post_condition))
 322                 __save_gotos(loop_name);
 323
 324         if (is_forever_loop(stmt)) {
 325                 __use_breaks();
 326         } else {
 327                 __split_whole_condition(stmt->iterator_post_condition);
 328                 __use_false_states();
 329                 __merge_breaks();
 330         }
 331         loop_count--;
 332 }
 333
 334 static int empty_statement(struct statement *stmt)
 335 {
 336         if (!stmt)
 337                 return 0;
 338         if (stmt->type == STMT_EXPRESSION && !stmt->expression)
 339                 return 1;
 340         return 0;
 341 }
 342
 343 static int last_stmt_on_same_line()
 344 {
 345         struct statement *stmt;
 346         int i = 0;
 347
 348         FOR_EACH_PTR_REVERSE(big_statement_stack, stmt) {
 349                 if (!i++)
 350                         continue;
 351                 if  (stmt->pos.line == get_lineno())
 352                         return 1;
 353                 return 0;
 354         } END_FOR_EACH_PTR_REVERSE(stmt);
 355         return 0;
 356 }
 357
 358 static struct statement *last_stmt;
 359 static int is_last_stmt(struct statement *stmt)
 360 {
 361         if (stmt == last_stmt)
 362                 return 1;
 363         return 0;
 364 }
 365
 366 static void print_unreached_initializers(struct symbol_list *sym_list)
 367 {
 368         struct symbol *sym;
 369
 370         FOR_EACH_PTR(sym_list, sym) {
 371                 if (sym->initializer)
 372                         sm_msg("info: '%s' is not actually initialized (unreached code).",
 373                                 (sym->ident ? sym->ident->name : "this variable"));
 374         } END_FOR_EACH_PTR(sym);
 375 }
 376
 377 static void print_unreached(struct statement *stmt)
 378 {
 379         static int print = 1;
 380
 381         if (!__path_is_null()) {
 382                 print = 1;
 383                 return;
 384         }
 385         if (!print)
 386                 return;
 387
 388         switch (stmt->type) {
 389         case STMT_COMPOUND: /* after a switch before a case stmt */
 390         case STMT_RANGE:
 391         case STMT_CASE:
 392         case STMT_LABEL:
 393                 return;
 394         case STMT_DECLARATION: /* switch (x) { int a; case foo: ... */
 395                 print_unreached_initializers(stmt->declaration);
 396                 return;
 397         case STMT_RETURN: /* gcc complains if you don't have a return statement */
 398                 if (is_last_stmt(stmt))
 399                         return;
 400                 break;
 401         case STMT_GOTO:
 402                 if (!option_spammy)
 403                         return;
 404                 break;
 405         default:
 406                 break;
 407         }
 408         if (!option_spammy && empty_statement(stmt))
 409                 return;
 410         sm_msg("info: ignoring unreachable code.");
 411         print = 0;
 412 }
 413
 414 static void split_asm_constraints(struct expression_list *expr_list)
 415 {
 416         struct expression *expr;
 417         int state = 0;
 418
 419         FOR_EACH_PTR(expr_list, expr) {
 420                 switch (state) {
 421                 case 0: /* identifier */
 422                 case 1: /* constraint */
 423                         state++;
 424                         continue;
 425                 case 2: /* expression */
 426                         state = 0;
 427                         __split_expr(expr);
 428                         continue;
 429                 }
 430         } END_FOR_EACH_PTR(expr);
 431 }
 432
 433 static int is_case_val(struct statement *stmt, long long val)
 434 {
 435         long long case_val;
 436
 437         if (stmt->type != STMT_CASE)
 438                 return 0;
 439         if (!stmt->case_expression) {
 440                 __set_default();
 441                 return 1;
 442         }
 443         if (!get_value(stmt->case_expression, &case_val))
 444                 return 0;
 445         if (case_val == val)
 446                 return 1;
 447         return 0;
 448 }
 449
 450 static void split_known_switch(struct statement *stmt, long long val)
 451 {
 452         struct statement *tmp;
 453
 454         __split_expr(stmt->switch_expression);
 455
 456         push_expression(&switch_expr_stack, stmt->switch_expression);
 457         __save_switch_states(top_expression(switch_expr_stack));
 458         nullify_path();
 459         __push_default();
 460         __push_breaks();
 461
 462         stmt = stmt->switch_statement;
 463
 464         if (!last_stmt)
 465                 last_stmt = last_ptr_list((struct ptr_list *)stmt->stmts);
 466
 467         __push_scope_hooks();
 468         FOR_EACH_PTR(stmt->stmts, tmp) {
 469                 __smatch_lineno = tmp->pos.line;
 470                 if (is_case_val(tmp, val)) {
 471                         __merge_switches(top_expression(switch_expr_stack),
 472                                          stmt->case_expression);
 473                         __pass_case_to_client(top_expression(switch_expr_stack),
 474                                               stmt->case_expression);
 475                 }
 476                 if (__path_is_null())
 477                         continue;
 478                 __split_stmt(tmp);
 479                 if (__path_is_null()) {
 480                         __set_default();
 481                         goto out;
 482                 }
 483         } END_FOR_EACH_PTR(tmp);
 484 out:
 485         __call_scope_hooks();
 486         if (!__pop_default())
 487                 __merge_switches(top_expression(switch_expr_stack),
 488                                  NULL);
 489         __discard_switches();
 490         __merge_breaks();
 491         pop_expression(&switch_expr_stack);
 492 }
 493
 494 void __split_stmt(struct statement *stmt)
 495 {
 496         long long val;
 497
 498         if (!stmt)
 499                 return;
 500
 501         if (out_of_memory() || __bail_on_rest_of_function) {
 502                 static char *printed = NULL;
 503
 504                 if (printed != cur_func)
 505                         sm_msg("Function too hairy.  Giving up.");
 506                 printed = cur_func;
 507                 return;
 508         }
 509
 510         add_ptr_list(&big_statement_stack, stmt);
 511         free_expression_stack(&big_expression_stack);
 512         set_position(stmt->pos);
 513         print_unreached(stmt);
 514         __pass_to_client(stmt, STMT_HOOK);
 515
 516         switch (stmt->type) {
 517         case STMT_DECLARATION:
 518                 split_declaration(stmt->declaration);
 519                 return;
 520         case STMT_RETURN:
 521                 __split_expr(stmt->ret_value);
 522                 __pass_to_client(stmt->ret_value, RETURN_HOOK);
 523                 nullify_path();
 524                 return;
 525         case STMT_EXPRESSION:
 526                 __split_expr(stmt->expression);
 527                 return;
 528         case STMT_COMPOUND: {
 529                 struct statement *tmp;
 530
 531                 if (!last_stmt)
 532                         last_stmt = last_ptr_list((struct ptr_list *)stmt->stmts);
 533                 __push_scope_hooks();
 534                 FOR_EACH_PTR(stmt->stmts, tmp) {
 535                         __split_stmt(tmp);
 536                 } END_FOR_EACH_PTR(tmp);
 537                 __call_scope_hooks();
 538                 return;
 539         }
 540         case STMT_IF:
 541                 if (known_condition_true(stmt->if_conditional)) {
 542                         __split_stmt(stmt->if_true);
 543                         return;
 544                 }
 545                 if (known_condition_false(stmt->if_conditional)) {
 546                         __split_stmt(stmt->if_false);
 547                         return;
 548                 }
 549                 if (option_known_conditions &&
 550                     implied_condition_true(stmt->if_conditional)) {
 551                         sm_info("this condition is true.");
 552                         __split_stmt(stmt->if_true);
 553                         return;
 554                 }
 555                 if (option_known_conditions &&
 556                     implied_condition_false(stmt->if_conditional)) {
 557                         sm_info("this condition is false.");
 558                         __split_stmt(stmt->if_false);
 559                         return;
 560                 }
 561                 __split_whole_condition(stmt->if_conditional);
 562                 __split_stmt(stmt->if_true);
 563                 if (empty_statement(stmt->if_true) &&
 564                         last_stmt_on_same_line() &&
 565                         !get_macro_name(&stmt->if_true->pos))
 566                         sm_msg("warn: if();");
 567                 __push_true_states();
 568                 __use_false_states();
 569                 __split_stmt(stmt->if_false);
 570                 __merge_true_states();
 571                 return;
 572         case STMT_ITERATOR:
 573                 if (stmt->iterator_pre_condition)
 574                         handle_pre_loop(stmt);
 575                 else if (stmt->iterator_post_condition)
 576                         handle_post_loop(stmt);
 577                 else {
 578                         // these are for(;;) type loops.
 579                         handle_pre_loop(stmt);
 580                 }
 581                 return;
 582         case STMT_SWITCH:
 583                 if (get_value(stmt->switch_expression, &val)) {
 584                         split_known_switch(stmt, val);
 585                         return;
 586                 }
 587                 __split_expr(stmt->switch_expression);
 588                 push_expression(&switch_expr_stack, stmt->switch_expression);
 589                 __save_switch_states(top_expression(switch_expr_stack));
 590                 nullify_path();
 591                 __push_default();
 592                 __push_breaks();
 593                 __split_stmt(stmt->switch_statement);
 594                 if (!__pop_default())
 595                         __merge_switches(top_expression(switch_expr_stack),
 596                                       NULL);
 597                 __discard_switches();
 598                 __merge_breaks();
 599                 pop_expression(&switch_expr_stack);
 600                 return;
 601         case STMT_CASE:
 602                 __merge_switches(top_expression(switch_expr_stack),
 603                                       stmt->case_expression);
 604                 __pass_case_to_client(top_expression(switch_expr_stack),
 605                                       stmt->case_expression);
 606                 if (!stmt->case_expression)
 607                         __set_default();
 608                 __split_expr(stmt->case_expression);
 609                 __split_expr(stmt->case_to);
 610                 __split_stmt(stmt->case_statement);
 611                 return;
 612         case STMT_LABEL:
 613                 if (stmt->label_identifier &&
 614                     stmt->label_identifier->type == SYM_LABEL &&
 615                     stmt->label_identifier->ident) {
 616                         loop_count = 1000000;
 617                         __merge_gotos(stmt->label_identifier->ident->name);
 618                 }
 619                 __split_stmt(stmt->label_statement);
 620                 return;
 621         case STMT_GOTO:
 622                 __split_expr(stmt->goto_expression);
 623                 if (stmt->goto_label && stmt->goto_label->type == SYM_NODE) {
 624                         if (!strcmp(stmt->goto_label->ident->name, "break")) {
 625                                 __process_breaks();
 626                         } else if (!strcmp(stmt->goto_label->ident->name,
 627                                            "continue")) {
 628                                 __process_continues();
 629                         }
 630                 } else if (stmt->goto_label &&
 631                            stmt->goto_label->type == SYM_LABEL &&
 632                            stmt->goto_label->ident) {
 633                         __save_gotos(stmt->goto_label->ident->name);
 634                 }
 635                 nullify_path();
 636                 return;
 637         case STMT_NONE:
 638                 return;
 639         case STMT_ASM:
 640                 __pass_to_client(stmt, ASM_HOOK);
 641                 __split_expr(stmt->asm_string);
 642                 split_asm_constraints(stmt->asm_outputs);
 643                 split_asm_constraints(stmt->asm_inputs);
 644                 split_asm_constraints(stmt->asm_clobbers);
 645                 return;
 646         case STMT_CONTEXT:
 647                 return;
 648         case STMT_RANGE:
 649                 __split_expr(stmt->range_expression);
 650                 __split_expr(stmt->range_low);
 651                 __split_expr(stmt->range_high);
 652                 return;
 653         }
 654 }
 655
 656 static void split_expr_list(struct expression_list *expr_list)
 657 {
 658         struct expression *expr;
 659
 660         FOR_EACH_PTR(expr_list, expr) {
 661                 __split_expr(expr);
 662         } END_FOR_EACH_PTR(expr);
 663 }
 664
 665 static void split_sym(struct symbol *sym)
 666 {
 667         if (!sym)
 668                 return;
 669         if (!(sym->namespace & NS_SYMBOL))
 670                 return;
 671
 672         __split_stmt(sym->stmt);
 673         __split_expr(sym->array_size);
 674         split_symlist(sym->arguments);
 675         split_symlist(sym->symbol_list);
 676         __split_stmt(sym->inline_stmt);
 677         split_symlist(sym->inline_symbol_list);
 678 }
 679
 680 static void split_symlist(struct symbol_list *sym_list)
 681 {
 682         struct symbol *sym;
 683
 684         FOR_EACH_PTR(sym_list, sym) {
 685                 split_sym(sym);
 686         } END_FOR_EACH_PTR(sym);
 687 }
 688
 689 static struct expression *fake_assign_expr(struct symbol *sym)
 690 {
 691         struct expression *e_assign, *e_symbol;
 692
 693         e_assign = alloc_expression(sym->initializer->pos, EXPR_ASSIGNMENT);
 694         e_symbol = alloc_expression(sym->pos, EXPR_SYMBOL);
 695         e_assign->op = (int)'=';
 696         e_symbol->symbol = sym;
 697         e_symbol->symbol_name = sym->ident;
 698         e_assign->left = e_symbol;
 699         e_assign->right = sym->initializer;
 700         return e_assign;
 701 }
 702
 703 static void do_initializer_stuff(struct symbol *sym)
 704 {
 705         struct expression *assign;
 706
 707         if (!sym->initializer)
 708                 return;
 709         assign = fake_assign_expr(sym);
 710         __split_expr(assign);
 711 }
 712
 713 static void split_declaration(struct symbol_list *sym_list)
 714 {
 715         struct symbol *sym;
 716
 717         FOR_EACH_PTR(sym_list, sym) {
 718                 __pass_to_client(sym, DECLARATION_HOOK);
 719                 do_initializer_stuff(sym);
 720                 split_sym(sym);
 721         } END_FOR_EACH_PTR(sym);
 722 }
 723
 724 static void split_function(struct symbol *sym)
 725 {
 726         struct symbol *base_type = get_base_type(sym);
 727
 728         cur_func_sym = sym;
 729         if (base_type->stmt)
 730                 line_func_start = base_type->stmt->pos.line;
 731         if (sym->ident)
 732                 cur_func = sym->ident->name;
 733         __smatch_lineno = sym->pos.line;
 734         last_stmt = NULL;
 735         loop_count = 0;
 736         sm_debug("new function:  %s\n", cur_func);
 737         if (option_two_passes) {
 738                 __unnullify_path();
 739                 loop_num = 0;
 740                 final_pass = 0;
 741                 __pass_to_client(sym, FUNC_DEF_HOOK);
 742                 __split_stmt(base_type->stmt);
 743                 __split_stmt(base_type->inline_stmt);
 744                 nullify_path();
 745         }
 746         __unnullify_path();
 747         loop_num = 0;
 748         final_pass = 1;
 749         __pass_to_client(sym, FUNC_DEF_HOOK);
 750         __split_stmt(base_type->stmt);
 751         __split_stmt(base_type->inline_stmt);
 752         __pass_to_client(sym, END_FUNC_HOOK);
 753         cur_func = NULL;
 754         line_func_start = 0;
 755         clear_all_states();
 756         free_data_info_allocs();
 757         free_expression_stack(&switch_expr_stack);
 758         __free_ptr_list((struct ptr_list **)&big_statement_stack);
 759         __bail_on_rest_of_function = 0;
 760 }
 761
 762 static struct symbol_list *inlines_called;
 763 static void add_inline_function(struct symbol *sym)
 764 {
 765         static struct symbol_list *already_added;
 766         struct symbol *tmp;
 767
 768         FOR_EACH_PTR(already_added, tmp) {
 769                 if (tmp == sym)
 770                         return;
 771         } END_FOR_EACH_PTR(tmp);
 772
 773         add_ptr_list(&already_added, sym);
 774         add_ptr_list(&inlines_called, sym);
 775 }
 776
 777 static void process_inlines()
 778 {
 779         struct symbol *tmp;
 780
 781         FOR_EACH_PTR(inlines_called, tmp) {
 782                 split_function(tmp);
 783         } END_FOR_EACH_PTR(tmp);
 784         free_ptr_list(&inlines_called);
 785 }
 786
 787 static void split_functions(struct symbol_list *sym_list)
 788 {
 789         struct symbol *sym;
 790
 791         FOR_EACH_PTR(sym_list, sym) {
 792                 set_position(sym->pos);
 793                 if (sym->type == SYM_NODE && get_base_type(sym)->type == SYM_FN) {
 794                         split_function(sym);
 795                         process_inlines();
 796                 } else {
 797                         __pass_to_client(sym, BASE_HOOK);
 798                 }
 799         } END_FOR_EACH_PTR(sym);
 800         __pass_to_client_no_data(END_FILE_HOOK);
 801 }
 802
 803 void smatch(int argc, char **argv)
 804 {
 805
 806         struct string_list *filelist = NULL;
 807         struct symbol_list *sym_list;
 808         char *file;
 809
 810         if (argc < 2) {
 811                 printf("Usage:  smatch [--debug] <filename.c>\n");
 812                 exit(1);
 813         }
 814         sparse_initialize(argc, argv, &filelist);
 815         FOR_EACH_PTR_NOTAG(filelist, file) {
 816                 if (option_file_output) {
 817                         char buf[256];
 818
 819                         snprintf(buf, sizeof(buf), "%s.smatch", file);
 820                         sm_outfd = fopen(buf, "w");
 821                         if (!sm_outfd) {
 822                                 printf("Error:  Cannot open %s\n", file);
 823                                 exit(1);
 824                         }
 825                 }
 826                 sym_list = sparse_keep_tokens(file);
 827                 split_functions(sym_list);
 828         } END_FOR_EACH_PTR_NOTAG(file);
 829 }