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                 if (known_condition_true(expr->conditional)) {
 172                         __split_expr(expr->cond_true);
 173                         break;
 174                 }
 175                 if (known_condition_false(expr->conditional)) {
 176                         __split_expr(expr->cond_false);
 177                         break;
 178                 }
 179                 __pass_to_client(expr, SELECT_HOOK);
 180                 __split_whole_condition(expr->conditional);
 181                 __split_expr(expr->cond_true);
 182                 __push_true_states();
 183                 __use_false_states();
 184                 __split_expr(expr->cond_false);
 185                 __merge_true_states();
 186                 break;
 187         case EXPR_CALL:
 188                 if (sym_name_is("__builtin_constant_p", expr->fn))
 189                         break;
 190                 split_expr_list(expr->args);
 191                 __split_expr(expr->fn);
 192                 if (is_inline_func(expr->fn))
 193                         add_inline_function(expr->fn->symbol);
 194                 __pass_to_client(expr, FUNCTION_CALL_HOOK);
 195                 break;
 196         case EXPR_INITIALIZER:
 197                 split_expr_list(expr->expr_list);
 198                 break;
 199         case EXPR_IDENTIFIER:
 200                 __split_expr(expr->ident_expression);
 201                 break;
 202         case EXPR_INDEX:
 203                 __split_expr(expr->idx_expression);
 204                 break;
 205         case EXPR_POS:
 206                 __split_expr(expr->init_expr);
 207                 break;
 208         case EXPR_SYMBOL:
 209                 __pass_to_client(expr, SYM_HOOK);
 210                 break;
 211         case EXPR_STRING:
 212                 __pass_to_client(expr, STRING_HOOK);
 213                 break;
 214         default:
 215                 break;
 216         };
 217         pop_expression(&big_expression_stack);
 218 }
 219
 220 static int is_forever_loop(struct statement *stmt)
 221 {
 222         struct expression *expr;
 223
 224         expr = strip_expr(stmt->iterator_pre_condition);
 225         if (!expr)
 226                 expr = stmt->iterator_post_condition;
 227         if (!expr) {
 228                 /* this is a for(;;) loop... */
 229                 return 1;
 230         }
 231
 232         if (expr->type == EXPR_VALUE && expr->value == 1)
 233                 return 1;
 234
 235         return 0;
 236 }
 237
 238 static int loop_num;
 239 static char *get_loop_name(int num)
 240 {
 241         char buf[256];
 242
 243         snprintf(buf, 255, "-loop%d", num);
 244         buf[255] = '\0';
 245         return alloc_sname(buf);
 246 }
 247
 248 /*
 249  * Pre Loops are while and for loops.
 250  */
 251 static void handle_pre_loop(struct statement *stmt)
 252 {
 253         int once_through; /* we go through the loop at least once */
 254         struct sm_state *extra_sm = NULL;
 255         int unchanged = 0;
 256         char *loop_name;
 257         struct state_list *slist = NULL;
 258         struct sm_state *sm = NULL;
 259
 260         loop_name = get_loop_name(loop_num);
 261         loop_num++;
 262
 263         __split_stmt(stmt->iterator_pre_statement);
 264
 265         once_through = implied_condition_true(stmt->iterator_pre_condition);
 266
 267         loop_count++;
 268         __push_continues();
 269         __push_breaks();
 270
 271         __merge_gotos(loop_name);
 272
 273         extra_sm = __extra_handle_canonical_loops(stmt, &slist);
 274         __in_pre_condition++;
 275         __pass_to_client(stmt, PRELOOP_HOOK);
 276         __split_whole_condition(stmt->iterator_pre_condition);
 277         __in_pre_condition--;
 278         FOR_EACH_PTR(slist, sm) {
 279                 set_state(sm->owner, sm->name, sm->sym, sm->state);
 280         } END_FOR_EACH_PTR(sm);
 281         free_slist(&slist);
 282         if (extra_sm)
 283                 extra_sm = get_sm_state(extra_sm->owner, extra_sm->name, extra_sm->sym);
 284
 285         if (option_assume_loops)
 286                 once_through = 1;
 287
 288         __split_stmt(stmt->iterator_statement);
 289         __warn_on_silly_pre_loops();
 290         if (is_forever_loop(stmt)) {
 291                 struct state_list *slist;
 292
 293                 __save_gotos(loop_name);
 294
 295                 __push_fake_cur_slist();
 296                 __split_stmt(stmt->iterator_post_statement);
 297                 slist = __pop_fake_cur_slist();
 298
 299                 __discard_continues();
 300                 __discard_false_states();
 301                 __use_breaks();
 302
 303                 if (!__path_is_null())
 304                         __merge_slist_into_cur(slist);
 305                 free_slist(&slist);
 306         } else {
 307                 __merge_continues();
 308                 unchanged = __iterator_unchanged(extra_sm);
 309                 __split_stmt(stmt->iterator_post_statement);
 310                 __save_gotos(loop_name);
 311                 __split_whole_condition(stmt->iterator_pre_condition);
 312                 nullify_path();
 313                 __merge_false_states();
 314                 if (once_through)
 315                         __discard_false_states();
 316                 else
 317                         __merge_false_states();
 318
 319                 if (extra_sm && unchanged)
 320                         __extra_pre_loop_hook_after(extra_sm,
 321                                                 stmt->iterator_post_statement,
 322                                                 stmt->iterator_pre_condition);
 323                 __merge_breaks();
 324         }
 325         loop_count--;
 326 }
 327
 328 /*
 329  * Post loops are do {} while();
 330  */
 331 static void handle_post_loop(struct statement *stmt)
 332 {
 333         char *loop_name;
 334
 335         loop_name = get_loop_name(loop_num);
 336         loop_num++;
 337         loop_count++;
 338
 339         __push_continues();
 340         __push_breaks();
 341         __merge_gotos(loop_name);
 342         __split_stmt(stmt->iterator_statement);
 343         __merge_continues();
 344         if (!is_zero(stmt->iterator_post_condition))
 345                 __save_gotos(loop_name);
 346
 347         if (is_forever_loop(stmt)) {
 348                 __use_breaks();
 349         } else {
 350                 __split_whole_condition(stmt->iterator_post_condition);
 351                 __use_false_states();
 352                 __merge_breaks();
 353         }
 354         loop_count--;
 355 }
 356
 357 static int empty_statement(struct statement *stmt)
 358 {
 359         if (!stmt)
 360                 return 0;
 361         if (stmt->type == STMT_EXPRESSION && !stmt->expression)
 362                 return 1;
 363         return 0;
 364 }
 365
 366 static int last_stmt_on_same_line()
 367 {
 368         struct statement *stmt;
 369         int i = 0;
 370
 371         FOR_EACH_PTR_REVERSE(big_statement_stack, stmt) {
 372                 if (!i++)
 373                         continue;
 374                 if  (stmt->pos.line == get_lineno())
 375                         return 1;
 376                 return 0;
 377         } END_FOR_EACH_PTR_REVERSE(stmt);
 378         return 0;
 379 }
 380
 381 static struct statement *last_stmt;
 382 static int is_last_stmt(struct statement *stmt)
 383 {
 384         if (stmt == last_stmt)
 385                 return 1;
 386         return 0;
 387 }
 388
 389 static void print_unreached_initializers(struct symbol_list *sym_list)
 390 {
 391         struct symbol *sym;
 392
 393         FOR_EACH_PTR(sym_list, sym) {
 394                 if (sym->initializer)
 395                         sm_msg("info: '%s' is not actually initialized (unreached code).",
 396                                 (sym->ident ? sym->ident->name : "this variable"));
 397         } END_FOR_EACH_PTR(sym);
 398 }
 399
 400 static void print_unreached(struct statement *stmt)
 401 {
 402         static int print = 1;
 403
 404         if (!__path_is_null()) {
 405                 print = 1;
 406                 return;
 407         }
 408         if (!print)
 409                 return;
 410
 411         switch (stmt->type) {
 412         case STMT_COMPOUND: /* after a switch before a case stmt */
 413         case STMT_RANGE:
 414         case STMT_CASE:
 415         case STMT_LABEL:
 416                 return;
 417         case STMT_DECLARATION: /* switch (x) { int a; case foo: ... */
 418                 print_unreached_initializers(stmt->declaration);
 419                 return;
 420         case STMT_RETURN: /* gcc complains if you don't have a return statement */
 421                 if (is_last_stmt(stmt))
 422                         return;
 423                 break;
 424         case STMT_GOTO:
 425                 if (!option_spammy)
 426                         return;
 427                 break;
 428         default:
 429                 break;
 430         }
 431         if (!option_spammy && empty_statement(stmt))
 432                 return;
 433         sm_msg("info: ignoring unreachable code.");
 434         print = 0;
 435 }
 436
 437 static void split_asm_constraints(struct expression_list *expr_list)
 438 {
 439         struct expression *expr;
 440         int state = 0;
 441
 442         FOR_EACH_PTR(expr_list, expr) {
 443                 switch (state) {
 444                 case 0: /* identifier */
 445                 case 1: /* constraint */
 446                         state++;
 447                         continue;
 448                 case 2: /* expression */
 449                         state = 0;
 450                         __split_expr(expr);
 451                         continue;
 452                 }
 453         } END_FOR_EACH_PTR(expr);
 454 }
 455
 456 static int is_case_val(struct statement *stmt, long long val)
 457 {
 458         long long case_val;
 459
 460         if (stmt->type != STMT_CASE)
 461                 return 0;
 462         if (!stmt->case_expression) {
 463                 __set_default();
 464                 return 1;
 465         }
 466         if (!get_value(stmt->case_expression, &case_val))
 467                 return 0;
 468         if (case_val == val)
 469                 return 1;
 470         return 0;
 471 }
 472
 473 static void split_known_switch(struct statement *stmt, long long val)
 474 {
 475         struct statement *tmp;
 476
 477         __split_expr(stmt->switch_expression);
 478
 479         push_expression(&switch_expr_stack, stmt->switch_expression);
 480         __save_switch_states(top_expression(switch_expr_stack));
 481         nullify_path();
 482         __push_default();
 483         __push_breaks();
 484
 485         stmt = stmt->switch_statement;
 486
 487         if (!last_stmt)
 488                 last_stmt = last_ptr_list((struct ptr_list *)stmt->stmts);
 489
 490         __push_scope_hooks();
 491         FOR_EACH_PTR(stmt->stmts, tmp) {
 492                 __smatch_lineno = tmp->pos.line;
 493                 if (is_case_val(tmp, val)) {
 494                         __merge_switches(top_expression(switch_expr_stack),
 495                                          stmt->case_expression);
 496                         __pass_case_to_client(top_expression(switch_expr_stack),
 497                                               stmt->case_expression);
 498                 }
 499                 if (__path_is_null())
 500                         continue;
 501                 __split_stmt(tmp);
 502                 if (__path_is_null()) {
 503                         __set_default();
 504                         goto out;
 505                 }
 506         } END_FOR_EACH_PTR(tmp);
 507 out:
 508         __call_scope_hooks();
 509         if (!__pop_default())
 510                 __merge_switches(top_expression(switch_expr_stack),
 511                                  NULL);
 512         __discard_switches();
 513         __merge_breaks();
 514         pop_expression(&switch_expr_stack);
 515 }
 516
 517 void __split_stmt(struct statement *stmt)
 518 {
 519         long long val;
 520
 521         if (!stmt)
 522                 return;
 523
 524         if (out_of_memory() || __bail_on_rest_of_function) {
 525                 static char *printed = NULL;
 526
 527                 if (printed != cur_func)
 528                         sm_msg("Function too hairy.  Giving up.");
 529                 printed = cur_func;
 530                 return;
 531         }
 532
 533         add_ptr_list(&big_statement_stack, stmt);
 534         free_expression_stack(&big_expression_stack);
 535         set_position(stmt->pos);
 536         print_unreached(stmt);
 537         __pass_to_client(stmt, STMT_HOOK);
 538
 539         switch (stmt->type) {
 540         case STMT_DECLARATION:
 541                 split_declaration(stmt->declaration);
 542                 return;
 543         case STMT_RETURN:
 544                 __split_expr(stmt->ret_value);
 545                 __pass_to_client(stmt->ret_value, RETURN_HOOK);
 546                 nullify_path();
 547                 return;
 548         case STMT_EXPRESSION:
 549                 __split_expr(stmt->expression);
 550                 return;
 551         case STMT_COMPOUND: {
 552                 struct statement *tmp;
 553
 554                 if (!last_stmt)
 555                         last_stmt = last_ptr_list((struct ptr_list *)stmt->stmts);
 556                 __push_scope_hooks();
 557                 FOR_EACH_PTR(stmt->stmts, tmp) {
 558                         __split_stmt(tmp);
 559                 } END_FOR_EACH_PTR(tmp);
 560                 __call_scope_hooks();
 561                 return;
 562         }
 563         case STMT_IF:
 564                 if (known_condition_true(stmt->if_conditional)) {
 565                         __split_stmt(stmt->if_true);
 566                         return;
 567                 }
 568                 if (known_condition_false(stmt->if_conditional)) {
 569                         __split_stmt(stmt->if_false);
 570                         return;
 571                 }
 572                 if (option_known_conditions &&
 573                     implied_condition_true(stmt->if_conditional)) {
 574                         sm_info("this condition is true.");
 575                         __split_stmt(stmt->if_true);
 576                         return;
 577                 }
 578                 if (option_known_conditions &&
 579                     implied_condition_false(stmt->if_conditional)) {
 580                         sm_info("this condition is false.");
 581                         __split_stmt(stmt->if_false);
 582                         return;
 583                 }
 584                 __split_whole_condition(stmt->if_conditional);
 585                 __split_stmt(stmt->if_true);
 586                 if (empty_statement(stmt->if_true) &&
 587                         last_stmt_on_same_line() &&
 588                         !get_macro_name(stmt->if_true->pos))
 589                         sm_msg("warn: if();");
 590                 __push_true_states();
 591                 __use_false_states();
 592                 __split_stmt(stmt->if_false);
 593                 __merge_true_states();
 594                 return;
 595         case STMT_ITERATOR:
 596                 if (stmt->iterator_pre_condition)
 597                         handle_pre_loop(stmt);
 598                 else if (stmt->iterator_post_condition)
 599                         handle_post_loop(stmt);
 600                 else {
 601                         // these are for(;;) type loops.
 602                         handle_pre_loop(stmt);
 603                 }
 604                 return;
 605         case STMT_SWITCH:
 606                 if (get_value(stmt->switch_expression, &val)) {
 607                         split_known_switch(stmt, val);
 608                         return;
 609                 }
 610                 __split_expr(stmt->switch_expression);
 611                 push_expression(&switch_expr_stack, stmt->switch_expression);
 612                 __save_switch_states(top_expression(switch_expr_stack));
 613                 nullify_path();
 614                 __push_default();
 615                 __push_breaks();
 616                 __split_stmt(stmt->switch_statement);
 617                 if (!__pop_default())
 618                         __merge_switches(top_expression(switch_expr_stack),
 619                                       NULL);
 620                 __discard_switches();
 621                 __merge_breaks();
 622                 pop_expression(&switch_expr_stack);
 623                 return;
 624         case STMT_CASE:
 625                 __merge_switches(top_expression(switch_expr_stack),
 626                                       stmt->case_expression);
 627                 __pass_case_to_client(top_expression(switch_expr_stack),
 628                                       stmt->case_expression);
 629                 if (!stmt->case_expression)
 630                         __set_default();
 631                 __split_expr(stmt->case_expression);
 632                 __split_expr(stmt->case_to);
 633                 __split_stmt(stmt->case_statement);
 634                 return;
 635         case STMT_LABEL:
 636                 if (stmt->label_identifier &&
 637                     stmt->label_identifier->type == SYM_LABEL &&
 638                     stmt->label_identifier->ident) {
 639                         loop_count = 1000000;
 640                         __merge_gotos(stmt->label_identifier->ident->name);
 641                 }
 642                 __split_stmt(stmt->label_statement);
 643                 return;
 644         case STMT_GOTO:
 645                 __split_expr(stmt->goto_expression);
 646                 if (stmt->goto_label && stmt->goto_label->type == SYM_NODE) {
 647                         if (!strcmp(stmt->goto_label->ident->name, "break")) {
 648                                 __process_breaks();
 649                         } else if (!strcmp(stmt->goto_label->ident->name,
 650                                            "continue")) {
 651                                 __process_continues();
 652                         }
 653                 } else if (stmt->goto_label &&
 654                            stmt->goto_label->type == SYM_LABEL &&
 655                            stmt->goto_label->ident) {
 656                         __save_gotos(stmt->goto_label->ident->name);
 657                 }
 658                 nullify_path();
 659                 return;
 660         case STMT_NONE:
 661                 return;
 662         case STMT_ASM:
 663                 __pass_to_client(stmt, ASM_HOOK);
 664                 __split_expr(stmt->asm_string);
 665                 split_asm_constraints(stmt->asm_outputs);
 666                 split_asm_constraints(stmt->asm_inputs);
 667                 split_asm_constraints(stmt->asm_clobbers);
 668                 return;
 669         case STMT_CONTEXT:
 670                 return;
 671         case STMT_RANGE:
 672                 __split_expr(stmt->range_expression);
 673                 __split_expr(stmt->range_low);
 674                 __split_expr(stmt->range_high);
 675                 return;
 676         }
 677 }
 678
 679 static void split_expr_list(struct expression_list *expr_list)
 680 {
 681         struct expression *expr;
 682
 683         FOR_EACH_PTR(expr_list, expr) {
 684                 __split_expr(expr);
 685         } END_FOR_EACH_PTR(expr);
 686 }
 687
 688 static void split_sym(struct symbol *sym)
 689 {
 690         if (!sym)
 691                 return;
 692         if (!(sym->namespace & NS_SYMBOL))
 693                 return;
 694
 695         __split_stmt(sym->stmt);
 696         __split_expr(sym->array_size);
 697         split_symlist(sym->arguments);
 698         split_symlist(sym->symbol_list);
 699         __split_stmt(sym->inline_stmt);
 700         split_symlist(sym->inline_symbol_list);
 701 }
 702
 703 static void split_symlist(struct symbol_list *sym_list)
 704 {
 705         struct symbol *sym;
 706
 707         FOR_EACH_PTR(sym_list, sym) {
 708                 split_sym(sym);
 709         } END_FOR_EACH_PTR(sym);
 710 }
 711
 712 static struct expression *fake_assign_expr(struct symbol *sym)
 713 {
 714         struct expression *e_assign, *e_symbol;
 715
 716         e_assign = alloc_expression(sym->initializer->pos, EXPR_ASSIGNMENT);
 717         e_symbol = alloc_expression(sym->pos, EXPR_SYMBOL);
 718         e_assign->op = (int)'=';
 719         e_symbol->symbol = sym;
 720         e_symbol->symbol_name = sym->ident;
 721         e_assign->left = e_symbol;
 722         e_assign->right = sym->initializer;
 723         return e_assign;
 724 }
 725
 726 static void do_initializer_stuff(struct symbol *sym)
 727 {
 728         struct expression *assign;
 729
 730         if (!sym->initializer)
 731                 return;
 732         assign = fake_assign_expr(sym);
 733         __split_expr(assign);
 734 }
 735
 736 static void split_declaration(struct symbol_list *sym_list)
 737 {
 738         struct symbol *sym;
 739
 740         FOR_EACH_PTR(sym_list, sym) {
 741                 __pass_to_client(sym, DECLARATION_HOOK);
 742                 do_initializer_stuff(sym);
 743                 split_sym(sym);
 744         } END_FOR_EACH_PTR(sym);
 745 }
 746
 747 static void split_function(struct symbol *sym)
 748 {
 749         struct symbol *base_type = get_base_type(sym);
 750
 751         cur_func_sym = sym;
 752         if (base_type->stmt)
 753                 line_func_start = base_type->stmt->pos.line;
 754         if (sym->ident)
 755                 cur_func = sym->ident->name;
 756         __smatch_lineno = sym->pos.line;
 757         last_stmt = NULL;
 758         loop_count = 0;
 759         sm_debug("new function:  %s\n", cur_func);
 760         if (option_two_passes) {
 761                 __unnullify_path();
 762                 loop_num = 0;
 763                 final_pass = 0;
 764                 __pass_to_client(sym, FUNC_DEF_HOOK);
 765                 __split_stmt(base_type->stmt);
 766                 __split_stmt(base_type->inline_stmt);
 767                 nullify_path();
 768         }
 769         __unnullify_path();
 770         loop_num = 0;
 771         final_pass = 1;
 772         __pass_to_client(sym, FUNC_DEF_HOOK);
 773         __split_stmt(base_type->stmt);
 774         __split_stmt(base_type->inline_stmt);
 775         __pass_to_client(sym, END_FUNC_HOOK);
 776         cur_func = NULL;
 777         line_func_start = 0;
 778         clear_all_states();
 779         free_data_info_allocs();
 780         free_expression_stack(&switch_expr_stack);
 781         __free_ptr_list((struct ptr_list **)&big_statement_stack);
 782         __bail_on_rest_of_function = 0;
 783 }
 784
 785 static struct symbol_list *inlines_called;
 786 static void add_inline_function(struct symbol *sym)
 787 {
 788         static struct symbol_list *already_added;
 789         struct symbol *tmp;
 790
 791         FOR_EACH_PTR(already_added, tmp) {
 792                 if (tmp == sym)
 793                         return;
 794         } END_FOR_EACH_PTR(tmp);
 795
 796         add_ptr_list(&already_added, sym);
 797         add_ptr_list(&inlines_called, sym);
 798 }
 799
 800 static void process_inlines()
 801 {
 802         struct symbol *tmp;
 803
 804         FOR_EACH_PTR(inlines_called, tmp) {
 805                 split_function(tmp);
 806         } END_FOR_EACH_PTR(tmp);
 807         free_ptr_list(&inlines_called);
 808 }
 809
 810 static void split_functions(struct symbol_list *sym_list)
 811 {
 812         struct symbol *sym;
 813
 814         FOR_EACH_PTR(sym_list, sym) {
 815                 set_position(sym->pos);
 816                 if (sym->type == SYM_NODE && get_base_type(sym)->type == SYM_FN) {
 817                         split_function(sym);
 818                         process_inlines();
 819                 } else {
 820                         __pass_to_client(sym, BASE_HOOK);
 821                 }
 822         } END_FOR_EACH_PTR(sym);
 823         __pass_to_client_no_data(END_FILE_HOOK);
 824 }
 825
 826 void smatch(int argc, char **argv)
 827 {
 828
 829         struct string_list *filelist = NULL;
 830         struct symbol_list *sym_list;
 831         char *file;
 832
 833         if (argc < 2) {
 834                 printf("Usage:  smatch [--debug] <filename.c>\n");
 835                 exit(1);
 836         }
 837         sparse_initialize(argc, argv, &filelist);
 838         FOR_EACH_PTR_NOTAG(filelist, file) {
 839                 if (option_file_output) {
 840                         char buf[256];
 841
 842                         snprintf(buf, sizeof(buf), "%s.smatch", file);
 843                         sm_outfd = fopen(buf, "w");
 844                         if (!sm_outfd) {
 845                                 printf("Error:  Cannot open %s\n", file);
 846                                 exit(1);
 847                         }
 848                 }
 849                 sym_list = sparse_keep_tokens(file);
 850                 split_functions(sym_list);
 851         } END_FOR_EACH_PTR_NOTAG(file);
 852 }