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 char *base_file;
  24 static const char *filename;
  25 static char *pathname;
  26 static char *full_filename;
  27 static char *cur_func;
  28 static int line_func_start;
  29 static int loop_count;
  30 int __expr_stmt_count;
  31 static struct expression_list *switch_expr_stack = NULL;
  32
  33 struct expression_list *big_expression_stack;
  34 struct statement_list *big_statement_stack;
  35 int __in_pre_condition = 0;
  36 int __bail_on_rest_of_function = 0;
  37 char *get_function(void) { return cur_func; }
  38 int get_lineno(void) { return __smatch_lineno; }
  39 int inside_loop(void) { return !!loop_count; }
  40 struct expression *get_switch_expr(void) { return top_expression(switch_expr_stack); }
  41 int in_expression_statement(void) { return !!__expr_stmt_count; }
  42
  43 static void split_symlist(struct symbol_list *sym_list);
  44 static void split_declaration(struct symbol_list *sym_list);
  45 static void split_expr_list(struct expression_list *expr_list);
  46 static void add_inline_function(struct symbol *sym);
  47
  48 int option_assume_loops = 0;
  49 int option_known_conditions = 0;
  50 int option_two_passes = 0;
  51 struct symbol *cur_func_sym = NULL;
  52
  53 const char *get_filename(void)
  54 {
  55         if (option_info)
  56                 return base_file;
  57         if (option_full_path)
  58                 return full_filename;
  59         return filename;
  60 }
  61
  62 static void set_position(struct position pos)
  63 {
  64         int len;
  65         static int prev_stream = -1;
  66
  67         __smatch_lineno = pos.line;
  68
  69         if (pos.stream == prev_stream)
  70                 return;
  71
  72         filename = stream_name(pos.stream);
  73
  74         free(full_filename);
  75         pathname = getcwd(NULL, 0);
  76         if (pathname) {
  77                 len = strlen(pathname) + 1 + strlen(filename) + 1;
  78                 full_filename = malloc(len);
  79                 snprintf(full_filename, len, "%s/%s", pathname, filename);
  80         } else {
  81                 full_filename = alloc_string(filename);
  82         }
  83         free(pathname);
  84 }
  85
  86 static int is_inline_func(struct expression *expr)
  87 {
  88         if (expr->type != EXPR_SYMBOL || !expr->symbol)
  89                 return 0;
  90         if (expr->symbol->ctype.modifiers & MOD_INLINE)
  91                 return 1;
  92         return 0;
  93 }
  94
  95 static int is_noreturn_func(struct expression *expr)
  96 {
  97         if (expr->type != EXPR_SYMBOL || !expr->symbol)
  98                 return 0;
  99         if (expr->symbol->ctype.modifiers & MOD_NORETURN)
 100                 return 1;
 101         return 0;
 102 }
 103
 104 void __split_expr(struct expression *expr)
 105 {
 106         if (!expr)
 107                 return;
 108
 109         // sm_msg(" Debug expr_type %d %s", expr->type, show_special(expr->op));
 110
 111         push_expression(&big_expression_stack, expr);
 112         set_position(expr->pos);
 113         __pass_to_client(expr, EXPR_HOOK);
 114
 115         switch (expr->type) {
 116         case EXPR_PREOP:
 117                 if (expr->op == '*')
 118                         __pass_to_client(expr, DEREF_HOOK);
 119         case EXPR_POSTOP:
 120                 __pass_to_client(expr, OP_HOOK);
 121                 __split_expr(expr->unop);
 122                 break;
 123         case EXPR_STATEMENT:
 124                 __expr_stmt_count++;
 125                 __split_stmt(expr->statement);
 126                 __expr_stmt_count--;
 127                 break;
 128         case EXPR_LOGICAL:
 129         case EXPR_COMPARE:
 130                 __pass_to_client(expr, LOGIC_HOOK);
 131                 __handle_logic(expr);
 132                 break;
 133         case EXPR_BINOP:
 134                 __pass_to_client(expr, BINOP_HOOK);
 135         case EXPR_COMMA:
 136                 __split_expr(expr->left);
 137                 __split_expr(expr->right);
 138                 break;
 139         case EXPR_ASSIGNMENT: {
 140                 struct expression *tmp;
 141
 142                 if (!expr->right)
 143                         break;
 144
 145                 __pass_to_client(expr, RAW_ASSIGNMENT_HOOK);
 146
 147                 /* foo = !bar() */
 148                 if (__handle_condition_assigns(expr))
 149                         break;
 150                 /* foo = (x < 5 ? foo : 5); */
 151                 if (__handle_select_assigns(expr))
 152                         break;
 153                 /* foo = ({frob(); frob(); frob(); 1;}) */
 154                 if (__handle_expr_statement_assigns(expr))
 155                         break;
 156
 157                 __split_expr(expr->right);
 158                 __pass_to_client(expr, ASSIGNMENT_HOOK);
 159                 tmp = strip_expr(expr->right);
 160                 if (tmp->type == EXPR_CALL)
 161                         __pass_to_client(expr, CALL_ASSIGNMENT_HOOK);
 162                 if (get_macro_name(tmp->pos) &&
 163                     get_macro_name(expr->pos) != get_macro_name(tmp->pos))
 164                         __pass_to_client(expr, MACRO_ASSIGNMENT_HOOK);
 165                 __split_expr(expr->left);
 166                 break;
 167         }
 168         case EXPR_DEREF:
 169                 __pass_to_client(expr, DEREF_HOOK);
 170                 __split_expr(expr->deref);
 171                 break;
 172         case EXPR_SLICE:
 173                 __split_expr(expr->base);
 174                 break;
 175         case EXPR_CAST:
 176         case EXPR_FORCE_CAST:
 177                 __pass_to_client(expr, CAST_HOOK);
 178                 __split_expr(expr->cast_expression);
 179                 break;
 180         case EXPR_SIZEOF:
 181                 if (expr->cast_expression)
 182                         __pass_to_client(strip_parens(expr->cast_expression),
 183                                          SIZEOF_HOOK);
 184                 break;
 185         case EXPR_OFFSETOF:
 186         case EXPR_ALIGNOF:
 187                 evaluate_expression(expr);
 188                 break;
 189         case EXPR_CONDITIONAL:
 190         case EXPR_SELECT:
 191                 if (known_condition_true(expr->conditional)) {
 192                         __split_expr(expr->cond_true);
 193                         break;
 194                 }
 195                 if (known_condition_false(expr->conditional)) {
 196                         __split_expr(expr->cond_false);
 197                         break;
 198                 }
 199                 __pass_to_client(expr, SELECT_HOOK);
 200                 __split_whole_condition(expr->conditional);
 201                 __split_expr(expr->cond_true);
 202                 __push_true_states();
 203                 __use_false_states();
 204                 __split_expr(expr->cond_false);
 205                 __merge_true_states();
 206                 break;
 207         case EXPR_CALL:
 208                 if (sym_name_is("__builtin_constant_p", expr->fn))
 209                         break;
 210                 split_expr_list(expr->args);
 211                 __split_expr(expr->fn);
 212                 if (is_inline_func(expr->fn))
 213                         add_inline_function(expr->fn->symbol);
 214                 __pass_to_client(expr, FUNCTION_CALL_HOOK);
 215                 if (is_noreturn_func(expr->fn))
 216                         nullify_path();
 217                 break;
 218         case EXPR_INITIALIZER:
 219                 split_expr_list(expr->expr_list);
 220                 break;
 221         case EXPR_IDENTIFIER:
 222                 __split_expr(expr->ident_expression);
 223                 break;
 224         case EXPR_INDEX:
 225                 __split_expr(expr->idx_expression);
 226                 break;
 227         case EXPR_POS:
 228                 __split_expr(expr->init_expr);
 229                 break;
 230         case EXPR_SYMBOL:
 231                 __pass_to_client(expr, SYM_HOOK);
 232                 break;
 233         case EXPR_STRING:
 234                 __pass_to_client(expr, STRING_HOOK);
 235                 break;
 236         default:
 237                 break;
 238         };
 239         pop_expression(&big_expression_stack);
 240 }
 241
 242 static int is_forever_loop(struct statement *stmt)
 243 {
 244         struct expression *expr;
 245
 246         expr = strip_expr(stmt->iterator_pre_condition);
 247         if (!expr)
 248                 expr = stmt->iterator_post_condition;
 249         if (!expr) {
 250                 /* this is a for(;;) loop... */
 251                 return 1;
 252         }
 253
 254         if (expr->type == EXPR_VALUE && expr->value == 1)
 255                 return 1;
 256
 257         return 0;
 258 }
 259
 260 static int loop_num;
 261 static char *get_loop_name(int num)
 262 {
 263         char buf[256];
 264
 265         snprintf(buf, 255, "-loop%d", num);
 266         buf[255] = '\0';
 267         return alloc_sname(buf);
 268 }
 269
 270 /*
 271  * Pre Loops are while and for loops.
 272  */
 273 static void handle_pre_loop(struct statement *stmt)
 274 {
 275         int once_through; /* we go through the loop at least once */
 276         struct sm_state *extra_sm = NULL;
 277         int unchanged = 0;
 278         char *loop_name;
 279         struct state_list *slist = NULL;
 280         struct sm_state *sm = NULL;
 281
 282         loop_name = get_loop_name(loop_num);
 283         loop_num++;
 284
 285         __split_stmt(stmt->iterator_pre_statement);
 286
 287         once_through = implied_condition_true(stmt->iterator_pre_condition);
 288
 289         loop_count++;
 290         __push_continues();
 291         __push_breaks();
 292
 293         __merge_gotos(loop_name);
 294
 295         extra_sm = __extra_handle_canonical_loops(stmt, &slist);
 296         __in_pre_condition++;
 297         __pass_to_client(stmt, PRELOOP_HOOK);
 298         __split_whole_condition(stmt->iterator_pre_condition);
 299         __in_pre_condition--;
 300         FOR_EACH_PTR(slist, sm) {
 301                 set_state(sm->owner, sm->name, sm->sym, sm->state);
 302         } END_FOR_EACH_PTR(sm);
 303         free_slist(&slist);
 304         if (extra_sm)
 305                 extra_sm = get_sm_state(extra_sm->owner, extra_sm->name, extra_sm->sym);
 306
 307         if (option_assume_loops)
 308                 once_through = 1;
 309
 310         __split_stmt(stmt->iterator_statement);
 311         __warn_on_silly_pre_loops();
 312         if (is_forever_loop(stmt)) {
 313                 struct state_list *slist;
 314
 315                 __save_gotos(loop_name);
 316
 317                 __push_fake_cur_slist();
 318                 __split_stmt(stmt->iterator_post_statement);
 319                 slist = __pop_fake_cur_slist();
 320
 321                 __discard_continues();
 322                 __discard_false_states();
 323                 __use_breaks();
 324
 325                 if (!__path_is_null())
 326                         __merge_slist_into_cur(slist);
 327                 free_slist(&slist);
 328         } else {
 329                 __merge_continues();
 330                 unchanged = __iterator_unchanged(extra_sm);
 331                 __split_stmt(stmt->iterator_post_statement);
 332                 __save_gotos(loop_name);
 333                 __split_whole_condition(stmt->iterator_pre_condition);
 334                 nullify_path();
 335                 __merge_false_states();
 336                 if (once_through)
 337                         __discard_false_states();
 338                 else
 339                         __merge_false_states();
 340
 341                 if (extra_sm && unchanged)
 342                         __extra_pre_loop_hook_after(extra_sm,
 343                                                 stmt->iterator_post_statement,
 344                                                 stmt->iterator_pre_condition);
 345                 __merge_breaks();
 346         }
 347         loop_count--;
 348 }
 349
 350 /*
 351  * Post loops are do {} while();
 352  */
 353 static void handle_post_loop(struct statement *stmt)
 354 {
 355         char *loop_name;
 356
 357         loop_name = get_loop_name(loop_num);
 358         loop_num++;
 359         loop_count++;
 360
 361         __push_continues();
 362         __push_breaks();
 363         __merge_gotos(loop_name);
 364         __split_stmt(stmt->iterator_statement);
 365         __merge_continues();
 366         if (!is_zero(stmt->iterator_post_condition))
 367                 __save_gotos(loop_name);
 368
 369         if (is_forever_loop(stmt)) {
 370                 __use_breaks();
 371         } else {
 372                 __split_whole_condition(stmt->iterator_post_condition);
 373                 __use_false_states();
 374                 __merge_breaks();
 375         }
 376         loop_count--;
 377 }
 378
 379 static int empty_statement(struct statement *stmt)
 380 {
 381         if (!stmt)
 382                 return 0;
 383         if (stmt->type == STMT_EXPRESSION && !stmt->expression)
 384                 return 1;
 385         return 0;
 386 }
 387
 388 static int last_stmt_on_same_line()
 389 {
 390         struct statement *stmt;
 391         int i = 0;
 392
 393         FOR_EACH_PTR_REVERSE(big_statement_stack, stmt) {
 394                 if (!i++)
 395                         continue;
 396                 if  (stmt->pos.line == get_lineno())
 397                         return 1;
 398                 return 0;
 399         } END_FOR_EACH_PTR_REVERSE(stmt);
 400         return 0;
 401 }
 402
 403 static struct statement *last_stmt;
 404 static int is_last_stmt(struct statement *stmt)
 405 {
 406         if (stmt == last_stmt)
 407                 return 1;
 408         return 0;
 409 }
 410
 411 static void print_unreached_initializers(struct symbol_list *sym_list)
 412 {
 413         struct symbol *sym;
 414
 415         FOR_EACH_PTR(sym_list, sym) {
 416                 if (sym->initializer)
 417                         sm_msg("info: '%s' is not actually initialized (unreached code).",
 418                                 (sym->ident ? sym->ident->name : "this variable"));
 419         } END_FOR_EACH_PTR(sym);
 420 }
 421
 422 static void print_unreached(struct statement *stmt)
 423 {
 424         static int print = 1;
 425
 426         if (!__path_is_null()) {
 427                 print = 1;
 428                 return;
 429         }
 430         if (!print)
 431                 return;
 432
 433         switch (stmt->type) {
 434         case STMT_COMPOUND: /* after a switch before a case stmt */
 435         case STMT_RANGE:
 436         case STMT_CASE:
 437         case STMT_LABEL:
 438                 return;
 439         case STMT_DECLARATION: /* switch (x) { int a; case foo: ... */
 440                 print_unreached_initializers(stmt->declaration);
 441                 return;
 442         case STMT_RETURN: /* gcc complains if you don't have a return statement */
 443                 if (is_last_stmt(stmt))
 444                         return;
 445                 break;
 446         case STMT_GOTO:
 447                 if (!option_spammy)
 448                         return;
 449                 break;
 450         default:
 451                 break;
 452         }
 453         if (!option_spammy && empty_statement(stmt))
 454                 return;
 455         sm_msg("info: ignoring unreachable code.");
 456         print = 0;
 457 }
 458
 459 static void split_asm_constraints(struct expression_list *expr_list)
 460 {
 461         struct expression *expr;
 462         int state = 0;
 463
 464         FOR_EACH_PTR(expr_list, expr) {
 465                 switch (state) {
 466                 case 0: /* identifier */
 467                 case 1: /* constraint */
 468                         state++;
 469                         continue;
 470                 case 2: /* expression */
 471                         state = 0;
 472                         __split_expr(expr);
 473                         continue;
 474                 }
 475         } END_FOR_EACH_PTR(expr);
 476 }
 477
 478 static int is_case_val(struct statement *stmt, sval_t sval)
 479 {
 480         sval_t case_sval;
 481
 482         if (stmt->type != STMT_CASE)
 483                 return 0;
 484         if (!stmt->case_expression) {
 485                 __set_default();
 486                 return 1;
 487         }
 488         if (!get_value(stmt->case_expression, &case_sval))
 489                 return 0;
 490         if (case_sval.value == sval.value)
 491                 return 1;
 492         return 0;
 493 }
 494
 495 static void split_known_switch(struct statement *stmt, sval_t sval)
 496 {
 497         struct statement *tmp;
 498
 499         __split_expr(stmt->switch_expression);
 500
 501         push_expression(&switch_expr_stack, stmt->switch_expression);
 502         __save_switch_states(top_expression(switch_expr_stack));
 503         nullify_path();
 504         __push_default();
 505         __push_breaks();
 506
 507         stmt = stmt->switch_statement;
 508
 509         if (!last_stmt)
 510                 last_stmt = last_ptr_list((struct ptr_list *)stmt->stmts);
 511
 512         __push_scope_hooks();
 513         FOR_EACH_PTR(stmt->stmts, tmp) {
 514                 __smatch_lineno = tmp->pos.line;
 515                 if (is_case_val(tmp, sval)) {
 516                         __merge_switches(top_expression(switch_expr_stack),
 517                                          stmt->case_expression);
 518                         __pass_case_to_client(top_expression(switch_expr_stack),
 519                                               stmt->case_expression);
 520                 }
 521                 if (__path_is_null())
 522                         continue;
 523                 __split_stmt(tmp);
 524                 if (__path_is_null()) {
 525                         __set_default();
 526                         goto out;
 527                 }
 528         } END_FOR_EACH_PTR(tmp);
 529 out:
 530         __call_scope_hooks();
 531         if (!__pop_default())
 532                 __merge_switches(top_expression(switch_expr_stack),
 533                                  NULL);
 534         __discard_switches();
 535         __merge_breaks();
 536         pop_expression(&switch_expr_stack);
 537 }
 538
 539 void __split_stmt(struct statement *stmt)
 540 {
 541         sval_t sval;
 542
 543         if (!stmt)
 544                 return;
 545
 546         if (out_of_memory() || __bail_on_rest_of_function) {
 547                 static char *printed = NULL;
 548
 549                 if (printed != cur_func)
 550                         sm_msg("Function too hairy.  Giving up.");
 551                 final_pass = 0;  /* turn off sm_msg() from here */
 552                 printed = cur_func;
 553                 return;
 554         }
 555
 556         add_ptr_list(&big_statement_stack, stmt);
 557         free_expression_stack(&big_expression_stack);
 558         set_position(stmt->pos);
 559         print_unreached(stmt);
 560         __pass_to_client(stmt, STMT_HOOK);
 561
 562         switch (stmt->type) {
 563         case STMT_DECLARATION:
 564                 split_declaration(stmt->declaration);
 565                 return;
 566         case STMT_RETURN:
 567                 __split_expr(stmt->ret_value);
 568                 __pass_to_client(stmt->ret_value, RETURN_HOOK);
 569                 nullify_path();
 570                 return;
 571         case STMT_EXPRESSION:
 572                 __split_expr(stmt->expression);
 573                 return;
 574         case STMT_COMPOUND: {
 575                 struct statement *tmp;
 576
 577                 if (!last_stmt)
 578                         last_stmt = last_ptr_list((struct ptr_list *)stmt->stmts);
 579                 __push_scope_hooks();
 580                 FOR_EACH_PTR(stmt->stmts, tmp) {
 581                         __split_stmt(tmp);
 582                 } END_FOR_EACH_PTR(tmp);
 583                 __call_scope_hooks();
 584                 return;
 585         }
 586         case STMT_IF:
 587                 if (known_condition_true(stmt->if_conditional)) {
 588                         __split_stmt(stmt->if_true);
 589                         return;
 590                 }
 591                 if (known_condition_false(stmt->if_conditional)) {
 592                         __split_stmt(stmt->if_false);
 593                         return;
 594                 }
 595                 if (option_known_conditions &&
 596                     implied_condition_true(stmt->if_conditional)) {
 597                         sm_info("this condition is true.");
 598                         __split_stmt(stmt->if_true);
 599                         return;
 600                 }
 601                 if (option_known_conditions &&
 602                     implied_condition_false(stmt->if_conditional)) {
 603                         sm_info("this condition is false.");
 604                         __split_stmt(stmt->if_false);
 605                         return;
 606                 }
 607                 __split_whole_condition(stmt->if_conditional);
 608                 __split_stmt(stmt->if_true);
 609                 if (empty_statement(stmt->if_true) &&
 610                         last_stmt_on_same_line() &&
 611                         !get_macro_name(stmt->if_true->pos))
 612                         sm_msg("warn: if();");
 613                 __push_true_states();
 614                 __use_false_states();
 615                 __split_stmt(stmt->if_false);
 616                 __merge_true_states();
 617                 return;
 618         case STMT_ITERATOR:
 619                 if (stmt->iterator_pre_condition)
 620                         handle_pre_loop(stmt);
 621                 else if (stmt->iterator_post_condition)
 622                         handle_post_loop(stmt);
 623                 else {
 624                         // these are for(;;) type loops.
 625                         handle_pre_loop(stmt);
 626                 }
 627                 return;
 628         case STMT_SWITCH:
 629                 if (get_value(stmt->switch_expression, &sval)) {
 630                         split_known_switch(stmt, sval);
 631                         return;
 632                 }
 633                 __split_expr(stmt->switch_expression);
 634                 push_expression(&switch_expr_stack, stmt->switch_expression);
 635                 __save_switch_states(top_expression(switch_expr_stack));
 636                 nullify_path();
 637                 __push_default();
 638                 __push_breaks();
 639                 __split_stmt(stmt->switch_statement);
 640                 if (!__pop_default())
 641                         __merge_switches(top_expression(switch_expr_stack),
 642                                       NULL);
 643                 __discard_switches();
 644                 __merge_breaks();
 645                 pop_expression(&switch_expr_stack);
 646                 return;
 647         case STMT_CASE:
 648                 __merge_switches(top_expression(switch_expr_stack),
 649                                       stmt->case_expression);
 650                 __pass_case_to_client(top_expression(switch_expr_stack),
 651                                       stmt->case_expression);
 652                 if (!stmt->case_expression)
 653                         __set_default();
 654                 __split_expr(stmt->case_expression);
 655                 __split_expr(stmt->case_to);
 656                 __split_stmt(stmt->case_statement);
 657                 return;
 658         case STMT_LABEL:
 659                 if (stmt->label_identifier &&
 660                     stmt->label_identifier->type == SYM_LABEL &&
 661                     stmt->label_identifier->ident) {
 662                         loop_count = 1000000;
 663                         __merge_gotos(stmt->label_identifier->ident->name);
 664                 }
 665                 __split_stmt(stmt->label_statement);
 666                 return;
 667         case STMT_GOTO:
 668                 __split_expr(stmt->goto_expression);
 669                 if (stmt->goto_label && stmt->goto_label->type == SYM_NODE) {
 670                         if (!strcmp(stmt->goto_label->ident->name, "break")) {
 671                                 __process_breaks();
 672                         } else if (!strcmp(stmt->goto_label->ident->name,
 673                                            "continue")) {
 674                                 __process_continues();
 675                         }
 676                 } else if (stmt->goto_label &&
 677                            stmt->goto_label->type == SYM_LABEL &&
 678                            stmt->goto_label->ident) {
 679                         __save_gotos(stmt->goto_label->ident->name);
 680                 }
 681                 nullify_path();
 682                 return;
 683         case STMT_NONE:
 684                 return;
 685         case STMT_ASM:
 686                 __pass_to_client(stmt, ASM_HOOK);
 687                 __split_expr(stmt->asm_string);
 688                 split_asm_constraints(stmt->asm_outputs);
 689                 split_asm_constraints(stmt->asm_inputs);
 690                 split_asm_constraints(stmt->asm_clobbers);
 691                 return;
 692         case STMT_CONTEXT:
 693                 return;
 694         case STMT_RANGE:
 695                 __split_expr(stmt->range_expression);
 696                 __split_expr(stmt->range_low);
 697                 __split_expr(stmt->range_high);
 698                 return;
 699         }
 700 }
 701
 702 static void split_expr_list(struct expression_list *expr_list)
 703 {
 704         struct expression *expr;
 705
 706         FOR_EACH_PTR(expr_list, expr) {
 707                 __split_expr(expr);
 708         } END_FOR_EACH_PTR(expr);
 709 }
 710
 711 static void split_sym(struct symbol *sym)
 712 {
 713         if (!sym)
 714                 return;
 715         if (!(sym->namespace & NS_SYMBOL))
 716                 return;
 717
 718         __split_stmt(sym->stmt);
 719         __split_expr(sym->array_size);
 720         split_symlist(sym->arguments);
 721         split_symlist(sym->symbol_list);
 722         __split_stmt(sym->inline_stmt);
 723         split_symlist(sym->inline_symbol_list);
 724 }
 725
 726 static void split_symlist(struct symbol_list *sym_list)
 727 {
 728         struct symbol *sym;
 729
 730         FOR_EACH_PTR(sym_list, sym) {
 731                 split_sym(sym);
 732         } END_FOR_EACH_PTR(sym);
 733 }
 734
 735 static void fake_member_assigns(struct symbol *sym)
 736 {
 737         struct expression *symbol, *deref, *assign, *tmp;
 738
 739         symbol = symbol_expression(sym);
 740         FOR_EACH_PTR(sym->initializer->expr_list, tmp) {
 741                 if (tmp->type != EXPR_IDENTIFIER) /* how to handle arrays?? */
 742                         continue;
 743                 deref = member_expression(symbol, '.', tmp->expr_ident);
 744                 assign = assign_expression(deref, tmp->ident_expression);
 745                 __split_expr(assign);
 746         } END_FOR_EACH_PTR(tmp);
 747 }
 748
 749 static void fake_assign_expr(struct symbol *sym)
 750 {
 751         struct expression *assign, *symbol;
 752
 753         symbol = symbol_expression(sym);
 754         assign = assign_expression(symbol, sym->initializer);
 755         __split_expr(assign);
 756 }
 757
 758 static void do_initializer_stuff(struct symbol *sym)
 759 {
 760         if (!sym->initializer)
 761                 return;
 762         if (sym->initializer->type == EXPR_INITIALIZER)
 763                 fake_member_assigns(sym);
 764         else
 765                 fake_assign_expr(sym);
 766 }
 767
 768 static void split_declaration(struct symbol_list *sym_list)
 769 {
 770         struct symbol *sym;
 771
 772         FOR_EACH_PTR(sym_list, sym) {
 773                 __pass_to_client(sym, DECLARATION_HOOK);
 774                 do_initializer_stuff(sym);
 775                 split_sym(sym);
 776         } END_FOR_EACH_PTR(sym);
 777 }
 778
 779 static void fake_global_assign(struct symbol *sym)
 780 {
 781         struct expression *assign, *symbol;
 782
 783         if (!sym->initializer)
 784                 return;
 785         if (sym->initializer->type == EXPR_INITIALIZER) {
 786                 struct expression *deref, *tmp;
 787
 788                 symbol = symbol_expression(sym);
 789                 FOR_EACH_PTR(sym->initializer->expr_list, tmp) {
 790                         if (tmp->type != EXPR_IDENTIFIER) /* how to handle arrays?? */
 791                                 continue;
 792                         deref = member_expression(symbol, '.', tmp->expr_ident);
 793                         assign = assign_expression(deref, tmp->ident_expression);
 794                         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
 795                 } END_FOR_EACH_PTR(tmp);
 796         } else {
 797                 symbol = symbol_expression(sym);
 798                 assign = assign_expression(symbol, sym->initializer);
 799                 __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
 800         }
 801 }
 802
 803 static void split_function(struct symbol *sym)
 804 {
 805         struct symbol *base_type = get_base_type(sym);
 806
 807         cur_func_sym = sym;
 808         if (base_type->stmt)
 809                 line_func_start = base_type->stmt->pos.line;
 810         if (sym->ident)
 811                 cur_func = sym->ident->name;
 812         __smatch_lineno = sym->pos.line;
 813         last_stmt = NULL;
 814         loop_count = 0;
 815         sm_debug("new function:  %s\n", cur_func);
 816         __slist_id = 0;
 817         if (option_two_passes) {
 818                 __unnullify_path();
 819                 loop_num = 0;
 820                 final_pass = 0;
 821                 __pass_to_client(sym, FUNC_DEF_HOOK);
 822                 __pass_to_client(sym, AFTER_DEF_HOOK);
 823                 __split_stmt(base_type->stmt);
 824                 __split_stmt(base_type->inline_stmt);
 825                 nullify_path();
 826         }
 827         __unnullify_path();
 828         loop_num = 0;
 829         final_pass = 1;
 830         __pass_to_client(sym, FUNC_DEF_HOOK);
 831         __pass_to_client(sym, AFTER_DEF_HOOK);
 832         __split_stmt(base_type->stmt);
 833         __split_stmt(base_type->inline_stmt);
 834         __pass_to_client(sym, END_FUNC_HOOK);
 835         cur_func = NULL;
 836         line_func_start = 0;
 837         clear_all_states();
 838         free_data_info_allocs();
 839         free_expression_stack(&switch_expr_stack);
 840         __free_ptr_list((struct ptr_list **)&big_statement_stack);
 841         __bail_on_rest_of_function = 0;
 842 }
 843
 844 static struct symbol_list *inlines_called;
 845 static void add_inline_function(struct symbol *sym)
 846 {
 847         static struct symbol_list *already_added;
 848         struct symbol *tmp;
 849
 850         FOR_EACH_PTR(already_added, tmp) {
 851                 if (tmp == sym)
 852                         return;
 853         } END_FOR_EACH_PTR(tmp);
 854
 855         add_ptr_list(&already_added, sym);
 856         add_ptr_list(&inlines_called, sym);
 857 }
 858
 859 static void process_inlines()
 860 {
 861         struct symbol *tmp;
 862
 863         FOR_EACH_PTR(inlines_called, tmp) {
 864                 split_function(tmp);
 865         } END_FOR_EACH_PTR(tmp);
 866         free_ptr_list(&inlines_called);
 867 }
 868
 869 static void split_functions(struct symbol_list *sym_list)
 870 {
 871         struct symbol *sym;
 872
 873         FOR_EACH_PTR(sym_list, sym) {
 874                 set_position(sym->pos);
 875                 if (sym->type == SYM_NODE && get_base_type(sym)->type == SYM_FN) {
 876                         split_function(sym);
 877                         process_inlines();
 878                 } else {
 879                         __pass_to_client(sym, BASE_HOOK);
 880                         fake_global_assign(sym);
 881                 }
 882         } END_FOR_EACH_PTR(sym);
 883         __pass_to_client_no_data(END_FILE_HOOK);
 884 }
 885
 886 void smatch(int argc, char **argv)
 887 {
 888
 889         struct string_list *filelist = NULL;
 890         struct symbol_list *sym_list;
 891
 892         if (argc < 2) {
 893                 printf("Usage:  smatch [--debug] <filename.c>\n");
 894                 exit(1);
 895         }
 896         sparse_initialize(argc, argv, &filelist);
 897         FOR_EACH_PTR_NOTAG(filelist, base_file) {
 898                 if (option_file_output) {
 899                         char buf[256];
 900
 901                         snprintf(buf, sizeof(buf), "%s.smatch", base_file);
 902                         sm_outfd = fopen(buf, "w");
 903                         if (!sm_outfd) {
 904                                 printf("Error:  Cannot open %s\n", base_file);
 905                                 exit(1);
 906                         }
 907                 }
 908                 sym_list = sparse_keep_tokens(base_file);
 909                 split_functions(sym_list);
 910         } END_FOR_EACH_PTR_NOTAG(base_file);
 911 }