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