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