1 /*
   2  * Copyright (C) 2006,2008 Dan Carpenter.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
  16  */
  17 
  18 #define _GNU_SOURCE 1
  19 #include <unistd.h>
  20 #include <stdio.h>
  21 #include "token.h"
  22 #include "scope.h"
  23 #include "smatch.h"
  24 #include "smatch_expression_stacks.h"
  25 #include "smatch_extra.h"
  26 #include "smatch_slist.h"
  27 
  28 int __in_fake_assign;
  29 int __in_fake_struct_assign;
  30 int in_fake_env;
  31 int final_pass;
  32 int __inline_call;
  33 struct expression  *__inline_fn;
  34 
  35 static int __smatch_lineno = 0;
  36 
  37 static char *base_file;
  38 static const char *filename;
  39 static char *pathname;
  40 static char *full_filename;
  41 static char *full_base_file;
  42 static char *cur_func;
  43 static unsigned int loop_count;
  44 static int last_goto_statement_handled;
  45 int __expr_stmt_count;
  46 int __in_function_def;
  47 int __in_unmatched_hook;
  48 static struct expression_list *switch_expr_stack = NULL;
  49 static struct expression_list *post_op_stack = NULL;
  50 
  51 static struct ptr_list *backup;
  52 
  53 struct expression_list *big_expression_stack;
  54 struct statement_list *big_statement_stack;
  55 struct statement *__prev_stmt;
  56 struct statement *__cur_stmt;
  57 struct statement *__next_stmt;
  58 int __in_pre_condition = 0;
  59 int __bail_on_rest_of_function = 0;
  60 static struct timeval fn_start_time;
  61 static struct timeval outer_fn_start_time;
  62 char *get_function(void) { return cur_func; }
  63 int get_lineno(void) { return __smatch_lineno; }
  64 int inside_loop(void) { return !!loop_count; }
  65 int definitely_inside_loop(void) { return !!(loop_count & ~0x08000000); }
  66 struct expression *get_switch_expr(void) { return top_expression(switch_expr_stack); }
  67 int in_expression_statement(void) { return !!__expr_stmt_count; }
  68 
  69 static void split_symlist(struct symbol_list *sym_list);
  70 static void split_declaration(struct symbol_list *sym_list);
  71 static void split_expr_list(struct expression_list *expr_list, struct expression *parent);
  72 static void add_inline_function(struct symbol *sym);
  73 static void parse_inline(struct expression *expr);
  74 
  75 int option_assume_loops = 0;
  76 int option_two_passes = 0;
  77 struct symbol *cur_func_sym = NULL;
  78 struct stree *global_states;
  79 
  80 const unsigned long valid_ptr_min = 4096;
  81 unsigned long valid_ptr_max = ULONG_MAX & ~(MTAG_OFFSET_MASK);
  82 const sval_t valid_ptr_min_sval = {
  83         .type = &ptr_ctype,
  84         {.value = 4096},
  85 };
  86 sval_t valid_ptr_max_sval = {
  87         .type = &ptr_ctype,
  88         {.value = ULONG_MAX & ~(MTAG_OFFSET_MASK)},
  89 };
  90 struct range_list *valid_ptr_rl;
  91 
  92 void alloc_valid_ptr_rl(void)
  93 {
  94         valid_ptr_max = sval_type_max(&ulong_ctype).value & ~(MTAG_OFFSET_MASK);
  95         valid_ptr_max_sval.value = valid_ptr_max;
  96 
  97         valid_ptr_rl = alloc_rl(valid_ptr_min_sval, valid_ptr_max_sval);
  98         valid_ptr_rl = cast_rl(&ptr_ctype, valid_ptr_rl);
  99         valid_ptr_rl = clone_rl_permanent(valid_ptr_rl);
 100 }
 101 
 102 int outside_of_function(void)
 103 {
 104         return cur_func_sym == NULL;
 105 }
 106 
 107 const char *get_filename(void)
 108 {
 109         if (option_info && option_full_path)
 110                 return full_base_file;
 111         if (option_info)
 112                 return base_file;
 113         if (option_full_path)
 114                 return full_filename;
 115         return filename;
 116 }
 117 
 118 const char *get_base_file(void)
 119 {
 120         if (option_full_path)
 121                 return full_base_file;
 122         return base_file;
 123 }
 124 
 125 static void set_position(struct position pos)
 126 {
 127         int len;
 128         static int prev_stream = -1;
 129 
 130         if (in_fake_env)
 131                 return;
 132 
 133         if (pos.stream == 0 && pos.line == 0)
 134                 return;
 135 
 136         __smatch_lineno = pos.line;
 137 
 138         if (pos.stream == prev_stream)
 139                 return;
 140 
 141         filename = stream_name(pos.stream);
 142 
 143         free(full_filename);
 144         pathname = getcwd(NULL, 0);
 145         if (pathname) {
 146                 len = strlen(pathname) + 1 + strlen(filename) + 1;
 147                 full_filename = malloc(len);
 148                 snprintf(full_filename, len, "%s/%s", pathname, filename);
 149         } else {
 150                 full_filename = alloc_string(filename);
 151         }
 152         free(pathname);
 153 }
 154 
 155 int is_assigned_call(struct expression *expr)
 156 {
 157         struct expression *parent = expr_get_parent_expr(expr);
 158 
 159         if (parent &&
 160             parent->type == EXPR_ASSIGNMENT &&
 161             parent->op == '=' &&
 162             strip_expr(parent->right) == expr)
 163                 return 1;
 164 
 165         return 0;
 166 }
 167 
 168 static int is_inline_func(struct expression *expr)
 169 {
 170         if (expr->type != EXPR_SYMBOL || !expr->symbol)
 171                 return 0;
 172         if (expr->symbol->ctype.modifiers & MOD_INLINE)
 173                 return 1;
 174         return 0;
 175 }
 176 
 177 static int is_noreturn_func(struct expression *expr)
 178 {
 179         if (expr->type != EXPR_SYMBOL || !expr->symbol)
 180                 return 0;
 181         if (expr->symbol->ctype.modifiers & MOD_NORETURN)
 182                 return 1;
 183         return 0;
 184 }
 185 
 186 static int inline_budget = 20;
 187 
 188 int inlinable(struct expression *expr)
 189 {
 190         struct symbol *sym;
 191         struct statement *last_stmt = NULL;
 192 
 193         if (__inline_fn)  /* don't nest */
 194                 return 0;
 195 
 196         if (expr->type != EXPR_SYMBOL || !expr->symbol)
 197                 return 0;
 198         if (is_no_inline_function(expr->symbol->ident->name))
 199                 return 0;
 200         sym = get_base_type(expr->symbol);
 201         if (sym->stmt && sym->stmt->type == STMT_COMPOUND) {
 202                 if (ptr_list_size((struct ptr_list *)sym->stmt->stmts) > 10)
 203                         return 0;
 204                 if (sym->stmt->type != STMT_COMPOUND)
 205                         return 0;
 206                 last_stmt = last_ptr_list((struct ptr_list *)sym->stmt->stmts);
 207         }
 208         if (sym->inline_stmt && sym->inline_stmt->type == STMT_COMPOUND) {
 209                 if (ptr_list_size((struct ptr_list *)sym->inline_stmt->stmts) > 10)
 210                         return 0;
 211                 if (sym->inline_stmt->type != STMT_COMPOUND)
 212                         return 0;
 213                 last_stmt = last_ptr_list((struct ptr_list *)sym->inline_stmt->stmts);
 214         }
 215 
 216         if (!last_stmt)
 217                 return 0;
 218 
 219         /* the magic numbers in this function are pulled out of my bum. */
 220         if (last_stmt->pos.line > sym->pos.line + inline_budget)
 221                 return 0;
 222 
 223         return 1;
 224 }
 225 
 226 void __process_post_op_stack(void)
 227 {
 228         struct expression *expr;
 229 
 230         FOR_EACH_PTR(post_op_stack, expr) {
 231                 __pass_to_client(expr, OP_HOOK);
 232         } END_FOR_EACH_PTR(expr);
 233 
 234         __free_ptr_list((struct ptr_list **)&post_op_stack);
 235 }
 236 
 237 static int handle_comma_assigns(struct expression *expr)
 238 {
 239         struct expression *right;
 240         struct expression *assign;
 241 
 242         right = strip_expr(expr->right);
 243         if (right->type != EXPR_COMMA)
 244                 return 0;
 245 
 246         __split_expr(right->left);
 247         __process_post_op_stack();
 248 
 249         assign = assign_expression(expr->left, '=', right->right);
 250         __split_expr(assign);
 251 
 252         return 1;
 253 }
 254 
 255 /* This is to handle *p++ = foo; assignments */
 256 static int handle_postop_assigns(struct expression *expr)
 257 {
 258         struct expression *left, *fake_left;
 259         struct expression *assign;
 260 
 261         left = strip_expr(expr->left);
 262         if (left->type != EXPR_PREOP || left->op != '*')
 263                 return 0;
 264         left = strip_expr(left->unop);
 265         if (left->type != EXPR_POSTOP)
 266                 return 0;
 267 
 268         fake_left = deref_expression(strip_expr(left->unop));
 269         assign = assign_expression(fake_left, '=', expr->right);
 270 
 271         __split_expr(assign);
 272         __split_expr(expr->left);
 273 
 274         return 1;
 275 }
 276 
 277 static int prev_expression_is_getting_address(struct expression *expr)
 278 {
 279         struct expression *parent;
 280 
 281         do {
 282                 parent = expr_get_parent_expr(expr);
 283 
 284                 if (!parent)
 285                         return 0;
 286                 if (parent->type == EXPR_PREOP && parent->op == '&')
 287                         return 1;
 288                 if (parent->type == EXPR_PREOP && parent->op == '(')
 289                         goto next;
 290                 if (parent->type == EXPR_DEREF && parent->op == '.')
 291                         goto next;
 292 
 293                 return 0;
 294 next:
 295                 expr = parent;
 296         } while (1);
 297 }
 298 
 299 static void handle_builtin_overflow_func(struct expression *expr)
 300 {
 301         struct expression *a, *b, *res, *assign;
 302         int op;
 303 
 304         if (sym_name_is("__builtin_add_overflow", expr->fn))
 305                 op = '+';
 306         else if (sym_name_is("__builtin_sub_overflow", expr->fn))
 307                 op = '-';
 308         else if (sym_name_is("__builtin_mul_overflow", expr->fn))
 309                 op = '*';
 310         else
 311                 return;
 312 
 313         a = get_argument_from_call_expr(expr->args, 0);
 314         b = get_argument_from_call_expr(expr->args, 1);
 315         res = get_argument_from_call_expr(expr->args, 2);
 316 
 317         assign = assign_expression(deref_expression(res), '=', binop_expression(a, op, b));
 318         __split_expr(assign);
 319 }
 320 
 321 static int handle__builtin_choose_expr(struct expression *expr)
 322 {
 323         struct expression *const_expr, *expr1, *expr2;
 324         sval_t sval;
 325 
 326         if (!sym_name_is("__builtin_choose_expr", expr->fn))
 327                 return 0;
 328 
 329         const_expr = get_argument_from_call_expr(expr->args, 0);
 330         expr1 = get_argument_from_call_expr(expr->args, 1);
 331         expr2 = get_argument_from_call_expr(expr->args, 2);
 332 
 333         if (!get_value(const_expr, &sval) || !expr1 || !expr2)
 334                 return 0;
 335         if (sval.value)
 336                 __split_expr(expr1);
 337         else
 338                 __split_expr(expr2);
 339         return 1;
 340 }
 341 
 342 static int handle__builtin_choose_expr_assigns(struct expression *expr)
 343 {
 344         struct expression *const_expr, *right, *expr1, *expr2, *fake;
 345         sval_t sval;
 346 
 347         right = strip_expr(expr->right);
 348         if (right->type != EXPR_CALL)
 349                 return 0;
 350         if (!sym_name_is("__builtin_choose_expr", right->fn))
 351                 return 0;
 352 
 353         const_expr = get_argument_from_call_expr(right->args, 0);
 354         expr1 = get_argument_from_call_expr(right->args, 1);
 355         expr2 = get_argument_from_call_expr(right->args, 2);
 356 
 357         if (!get_value(const_expr, &sval) || !expr1 || !expr2)
 358                 return 0;
 359 
 360         fake = assign_expression(expr->left, '=', sval.value ? expr1 : expr2);
 361         __split_expr(fake);
 362         return 1;
 363 }
 364 
 365 void __split_expr(struct expression *expr)
 366 {
 367         if (!expr)
 368                 return;
 369 
 370         // sm_msg(" Debug expr_type %d %s", expr->type, show_special(expr->op));
 371 
 372         if (__in_fake_assign && expr->type != EXPR_ASSIGNMENT)
 373                 return;
 374         if (__in_fake_assign >= 4)  /* don't allow too much nesting */
 375                 return;
 376 
 377         push_expression(&big_expression_stack, expr);
 378         set_position(expr->pos);
 379         __pass_to_client(expr, EXPR_HOOK);
 380 
 381         switch (expr->type) {
 382         case EXPR_PREOP:
 383                 expr_set_parent_expr(expr->unop, expr);
 384 
 385                 if (expr->op == '*' &&
 386                     !prev_expression_is_getting_address(expr))
 387                         __pass_to_client(expr, DEREF_HOOK);
 388                 __split_expr(expr->unop);
 389                 __pass_to_client(expr, OP_HOOK);
 390                 break;
 391         case EXPR_POSTOP:
 392                 expr_set_parent_expr(expr->unop, expr);
 393 
 394                 __split_expr(expr->unop);
 395                 push_expression(&post_op_stack, expr);
 396                 break;
 397         case EXPR_STATEMENT:
 398                 __expr_stmt_count++;
 399                 if (expr->statement && !expr->statement) {
 400                         stmt_set_parent_stmt(expr->statement,
 401                                         last_ptr_list((struct ptr_list *)big_statement_stack));
 402                 }
 403                 __split_stmt(expr->statement);
 404                 __expr_stmt_count--;
 405                 break;
 406         case EXPR_LOGICAL:
 407         case EXPR_COMPARE:
 408                 expr_set_parent_expr(expr->left, expr);
 409                 expr_set_parent_expr(expr->right, expr);
 410 
 411                 __pass_to_client(expr, LOGIC_HOOK);
 412                 __handle_logic(expr);
 413                 break;
 414         case EXPR_BINOP:
 415                 expr_set_parent_expr(expr->left, expr);
 416                 expr_set_parent_expr(expr->right, expr);
 417 
 418                 __pass_to_client(expr, BINOP_HOOK);
 419         case EXPR_COMMA:
 420                 expr_set_parent_expr(expr->left, expr);
 421                 expr_set_parent_expr(expr->right, expr);
 422 
 423                 __split_expr(expr->left);
 424                 __process_post_op_stack();
 425                 __split_expr(expr->right);
 426                 break;
 427         case EXPR_ASSIGNMENT: {
 428                 struct expression *right;
 429 
 430                 expr_set_parent_expr(expr->left, expr);
 431                 expr_set_parent_expr(expr->right, expr);
 432 
 433                 right = strip_expr(expr->right);
 434                 if (!right)
 435                         break;
 436 
 437                 __pass_to_client(expr, RAW_ASSIGNMENT_HOOK);
 438 
 439                 /* foo = !bar() */
 440                 if (__handle_condition_assigns(expr))
 441                         break;
 442                 /* foo = (x < 5 ? foo : 5); */
 443                 if (__handle_select_assigns(expr))
 444                         break;
 445                 /* foo = ({frob(); frob(); frob(); 1;}) */
 446                 if (__handle_expr_statement_assigns(expr))
 447                         break;
 448                 /* foo = (3, 4); */
 449                 if (handle_comma_assigns(expr))
 450                         break;
 451                 if (handle_postop_assigns(expr))
 452                         break;
 453                 if (handle__builtin_choose_expr_assigns(expr))
 454                         break;
 455 
 456                 __split_expr(expr->right);
 457                 if (outside_of_function())
 458                         __pass_to_client(expr, GLOBAL_ASSIGNMENT_HOOK);
 459                 else
 460                         __pass_to_client(expr, ASSIGNMENT_HOOK);
 461 
 462                 __fake_struct_member_assignments(expr);
 463 
 464                 /* Re-examine ->right for inlines.  See the commit message */
 465                 right = strip_expr(expr->right);
 466                 if (expr->op == '=' && right->type == EXPR_CALL)
 467                         __pass_to_client(expr, CALL_ASSIGNMENT_HOOK);
 468 
 469                 if (get_macro_name(right->pos) &&
 470                     get_macro_name(expr->pos) != get_macro_name(right->pos))
 471                         __pass_to_client(expr, MACRO_ASSIGNMENT_HOOK);
 472 
 473                 __pass_to_client(expr, ASSIGNMENT_HOOK_AFTER);
 474 
 475                 __split_expr(expr->left);
 476                 break;
 477         }
 478         case EXPR_DEREF:
 479                 expr_set_parent_expr(expr->deref, expr);
 480 
 481                 __pass_to_client(expr, DEREF_HOOK);
 482                 __split_expr(expr->deref);
 483                 break;
 484         case EXPR_SLICE:
 485                 expr_set_parent_expr(expr->base, expr);
 486 
 487                 __split_expr(expr->base);
 488                 break;
 489         case EXPR_CAST:
 490         case EXPR_FORCE_CAST:
 491                 expr_set_parent_expr(expr->cast_expression, expr);
 492 
 493                 __pass_to_client(expr, CAST_HOOK);
 494                 __split_expr(expr->cast_expression);
 495                 break;
 496         case EXPR_SIZEOF:
 497                 if (expr->cast_expression)
 498                         __pass_to_client(strip_parens(expr->cast_expression),
 499                                          SIZEOF_HOOK);
 500                 break;
 501         case EXPR_OFFSETOF:
 502         case EXPR_ALIGNOF:
 503                 break;
 504         case EXPR_CONDITIONAL:
 505         case EXPR_SELECT:
 506                 expr_set_parent_expr(expr->conditional, expr);
 507                 expr_set_parent_expr(expr->cond_true, expr);
 508                 expr_set_parent_expr(expr->cond_false, expr);
 509 
 510                 if (known_condition_true(expr->conditional)) {
 511                         __split_expr(expr->cond_true);
 512                         break;
 513                 }
 514                 if (known_condition_false(expr->conditional)) {
 515                         __split_expr(expr->cond_false);
 516                         break;
 517                 }
 518                 __pass_to_client(expr, SELECT_HOOK);
 519                 __split_whole_condition(expr->conditional);
 520                 __split_expr(expr->cond_true);
 521                 __push_true_states();
 522                 __use_false_states();
 523                 __split_expr(expr->cond_false);
 524                 __merge_true_states();
 525                 break;
 526         case EXPR_CALL:
 527                 expr_set_parent_expr(expr->fn, expr);
 528 
 529                 if (sym_name_is("__builtin_constant_p", expr->fn))
 530                         break;
 531                 if (handle__builtin_choose_expr(expr))
 532                         break;
 533                 __split_expr(expr->fn);
 534                 split_expr_list(expr->args, expr);
 535                 if (is_inline_func(expr->fn))
 536                         add_inline_function(expr->fn->symbol);
 537                 if (inlinable(expr->fn))
 538                         __inline_call = 1;
 539                 __process_post_op_stack();
 540                 __pass_to_client(expr, FUNCTION_CALL_HOOK_BEFORE);
 541                 __pass_to_client(expr, FUNCTION_CALL_HOOK);
 542                 __inline_call = 0;
 543                 if (inlinable(expr->fn)) {
 544                         parse_inline(expr);
 545                 }
 546                 __pass_to_client(expr, CALL_HOOK_AFTER_INLINE);
 547                 if (is_noreturn_func(expr->fn))
 548                         nullify_path();
 549                 handle_builtin_overflow_func(expr);
 550                 break;
 551         case EXPR_INITIALIZER:
 552                 split_expr_list(expr->expr_list, expr);
 553                 break;
 554         case EXPR_IDENTIFIER:
 555                 expr_set_parent_expr(expr->ident_expression, expr);
 556                 __split_expr(expr->ident_expression);
 557                 break;
 558         case EXPR_INDEX:
 559                 expr_set_parent_expr(expr->idx_expression, expr);
 560                 __split_expr(expr->idx_expression);
 561                 break;
 562         case EXPR_POS:
 563                 expr_set_parent_expr(expr->init_expr, expr);
 564                 __split_expr(expr->init_expr);
 565                 break;
 566         case EXPR_SYMBOL:
 567                 __pass_to_client(expr, SYM_HOOK);
 568                 break;
 569         case EXPR_STRING:
 570                 __pass_to_client(expr, STRING_HOOK);
 571                 break;
 572         default:
 573                 break;
 574         };
 575         __pass_to_client(expr, EXPR_HOOK_AFTER);
 576         pop_expression(&big_expression_stack);
 577 }
 578 
 579 static int is_forever_loop(struct statement *stmt)
 580 {
 581         struct expression *expr;
 582         sval_t sval;
 583 
 584         expr = strip_expr(stmt->iterator_pre_condition);
 585         if (!expr)
 586                 expr = stmt->iterator_post_condition;
 587         if (!expr) {
 588                 /* this is a for(;;) loop... */
 589                 return 1;
 590         }
 591 
 592         if (get_value(expr, &sval) && sval.value != 0)
 593                 return 1;
 594 
 595         return 0;
 596 }
 597 
 598 static int loop_num;
 599 static char *get_loop_name(int num)
 600 {
 601         char buf[256];
 602 
 603         snprintf(buf, 255, "-loop%d", num);
 604         buf[255] = '\0';
 605         return alloc_sname(buf);
 606 }
 607 
 608 /*
 609  * Pre Loops are while and for loops.
 610  */
 611 static void handle_pre_loop(struct statement *stmt)
 612 {
 613         int once_through; /* we go through the loop at least once */
 614         struct sm_state *extra_sm = NULL;
 615         int unchanged = 0;
 616         char *loop_name;
 617         struct stree *stree = NULL;
 618         struct sm_state *sm = NULL;
 619 
 620         loop_name = get_loop_name(loop_num);
 621         loop_num++;
 622 
 623         __split_stmt(stmt->iterator_pre_statement);
 624         __prev_stmt = stmt->iterator_pre_statement;
 625 
 626         once_through = implied_condition_true(stmt->iterator_pre_condition);
 627 
 628         loop_count++;
 629         __push_continues();
 630         __push_breaks();
 631 
 632         __merge_gotos(loop_name, NULL);
 633 
 634         extra_sm = __extra_handle_canonical_loops(stmt, &stree);
 635         __in_pre_condition++;
 636         __pass_to_client(stmt, PRELOOP_HOOK);
 637         __split_whole_condition(stmt->iterator_pre_condition);
 638         __in_pre_condition--;
 639         FOR_EACH_SM(stree, sm) {
 640                 set_state(sm->owner, sm->name, sm->sym, sm->state);
 641         } END_FOR_EACH_SM(sm);
 642         free_stree(&stree);
 643         if (extra_sm)
 644                 extra_sm = get_sm_state(extra_sm->owner, extra_sm->name, extra_sm->sym);
 645 
 646         if (option_assume_loops)
 647                 once_through = 1;
 648 
 649         __split_stmt(stmt->iterator_statement);
 650         if (is_forever_loop(stmt)) {
 651                 __merge_continues();
 652                 __save_gotos(loop_name, NULL);
 653 
 654                 __push_fake_cur_stree();
 655                 __split_stmt(stmt->iterator_post_statement);
 656                 stree = __pop_fake_cur_stree();
 657 
 658                 __discard_false_states();
 659                 __use_breaks();
 660 
 661                 if (!__path_is_null())
 662                         __merge_stree_into_cur(stree);
 663                 free_stree(&stree);
 664         } else {
 665                 __merge_continues();
 666                 unchanged = __iterator_unchanged(extra_sm);
 667                 __split_stmt(stmt->iterator_post_statement);
 668                 __prev_stmt = stmt->iterator_post_statement;
 669                 __cur_stmt = stmt;
 670 
 671                 __save_gotos(loop_name, NULL);
 672                 __in_pre_condition++;
 673                 __split_whole_condition(stmt->iterator_pre_condition);
 674                 __in_pre_condition--;
 675                 nullify_path();
 676                 __merge_false_states();
 677                 if (once_through)
 678                         __discard_false_states();
 679                 else
 680                         __merge_false_states();
 681 
 682                 if (extra_sm && unchanged)
 683                         __extra_pre_loop_hook_after(extra_sm,
 684                                                 stmt->iterator_post_statement,
 685                                                 stmt->iterator_pre_condition);
 686                 __merge_breaks();
 687         }
 688         loop_count--;
 689 }
 690 
 691 /*
 692  * Post loops are do {} while();
 693  */
 694 static void handle_post_loop(struct statement *stmt)
 695 {
 696         char *loop_name;
 697 
 698         loop_name = get_loop_name(loop_num);
 699         loop_num++;
 700         loop_count++;
 701 
 702         __push_continues();
 703         __push_breaks();
 704         __merge_gotos(loop_name, NULL);
 705         __split_stmt(stmt->iterator_statement);
 706         __merge_continues();
 707         if (!expr_is_zero(stmt->iterator_post_condition))
 708                 __save_gotos(loop_name, NULL);
 709 
 710         if (is_forever_loop(stmt)) {
 711                 __use_breaks();
 712         } else {
 713                 __split_whole_condition(stmt->iterator_post_condition);
 714                 __use_false_states();
 715                 __merge_breaks();
 716         }
 717         loop_count--;
 718 }
 719 
 720 static int empty_statement(struct statement *stmt)
 721 {
 722         if (!stmt)
 723                 return 0;
 724         if (stmt->type == STMT_EXPRESSION && !stmt->expression)
 725                 return 1;
 726         return 0;
 727 }
 728 
 729 static int last_stmt_on_same_line(void)
 730 {
 731         struct statement *stmt;
 732         int i = 0;
 733 
 734         FOR_EACH_PTR_REVERSE(big_statement_stack, stmt) {
 735                 if (!i++)
 736                         continue;
 737                 if  (stmt->pos.line == get_lineno())
 738                         return 1;
 739                 return 0;
 740         } END_FOR_EACH_PTR_REVERSE(stmt);
 741         return 0;
 742 }
 743 
 744 static void split_asm_constraints(struct expression_list *expr_list)
 745 {
 746         struct expression *expr;
 747         int state = 0;
 748 
 749         FOR_EACH_PTR(expr_list, expr) {
 750                 switch (state) {
 751                 case 0: /* identifier */
 752                 case 1: /* constraint */
 753                         state++;
 754                         continue;
 755                 case 2: /* expression */
 756                         state = 0;
 757                         __split_expr(expr);
 758                         continue;
 759                 }
 760         } END_FOR_EACH_PTR(expr);
 761 }
 762 
 763 static int is_case_val(struct statement *stmt, sval_t sval)
 764 {
 765         sval_t case_sval;
 766 
 767         if (stmt->type != STMT_CASE)
 768                 return 0;
 769         if (!stmt->case_expression) {
 770                 __set_default();
 771                 return 1;
 772         }
 773         if (!get_value(stmt->case_expression, &case_sval))
 774                 return 0;
 775         if (case_sval.value == sval.value)
 776                 return 1;
 777         return 0;
 778 }
 779 
 780 static struct range_list *get_case_rl(struct expression *switch_expr,
 781                                       struct expression *case_expr,
 782                                       struct expression *case_to)
 783 {
 784         sval_t start, end;
 785         struct range_list *rl = NULL;
 786         struct symbol *switch_type;
 787 
 788         switch_type = get_type(switch_expr);
 789         if (get_value(case_to, &end) && get_value(case_expr, &start)) {
 790                 start = sval_cast(switch_type, start);
 791                 end = sval_cast(switch_type, end);
 792                 add_range(&rl, start, end);
 793         } else if (get_value(case_expr, &start)) {
 794                 start = sval_cast(switch_type, start);
 795                 add_range(&rl, start, start);
 796         }
 797 
 798         return rl;
 799 }
 800 
 801 static void split_known_switch(struct statement *stmt, sval_t sval)
 802 {
 803         struct statement *tmp;
 804         struct range_list *rl;
 805 
 806         __split_expr(stmt->switch_expression);
 807         sval = sval_cast(get_type(stmt->switch_expression), sval);
 808 
 809         push_expression(&switch_expr_stack, stmt->switch_expression);
 810         __save_switch_states(top_expression(switch_expr_stack));
 811         nullify_path();
 812         __push_default();
 813         __push_breaks();
 814 
 815         stmt = stmt->switch_statement;
 816 
 817         __push_scope_hooks();
 818         FOR_EACH_PTR(stmt->stmts, tmp) {
 819                 __smatch_lineno = tmp->pos.line;
 820                 if (is_case_val(tmp, sval)) {
 821                         rl = alloc_rl(sval, sval);
 822                         __merge_switches(top_expression(switch_expr_stack), rl);
 823                         __pass_case_to_client(top_expression(switch_expr_stack), rl);
 824                 }
 825                 if (__path_is_null())
 826                         continue;
 827                 __split_stmt(tmp);
 828                 if (__path_is_null()) {
 829                         __set_default();
 830                         goto out;
 831                 }
 832         } END_FOR_EACH_PTR(tmp);
 833 out:
 834         __call_scope_hooks();
 835         if (!__pop_default())
 836                 __merge_switches(top_expression(switch_expr_stack), NULL);
 837         __discard_switches();
 838         __merge_breaks();
 839         pop_expression(&switch_expr_stack);
 840 }
 841 
 842 static void split_case(struct statement *stmt)
 843 {
 844         struct range_list *rl = NULL;
 845 
 846         expr_set_parent_stmt(stmt->case_expression, stmt);
 847         expr_set_parent_stmt(stmt->case_to, stmt);
 848 
 849         rl = get_case_rl(top_expression(switch_expr_stack),
 850                          stmt->case_expression, stmt->case_to);
 851         while (stmt->case_statement->type == STMT_CASE) {
 852                 struct range_list *tmp;
 853 
 854                 tmp = get_case_rl(top_expression(switch_expr_stack),
 855                                   stmt->case_statement->case_expression,
 856                                   stmt->case_statement->case_to);
 857                 if (!tmp)
 858                         break;
 859                 rl = rl_union(rl, tmp);
 860                 if (!stmt->case_expression)
 861                         __set_default();
 862                 stmt = stmt->case_statement;
 863         }
 864 
 865         __merge_switches(top_expression(switch_expr_stack), rl);
 866 
 867         if (!stmt->case_expression)
 868                 __set_default();
 869         __split_stmt(stmt->case_statement);
 870 }
 871 
 872 int time_parsing_function(void)
 873 {
 874         return ms_since(&fn_start_time) / 1000;
 875 }
 876 
 877 /*
 878  * This defaults to 60 * 5 == 5 minutes, so we'll just multiply
 879  * whatever we're given by 5.
 880  */
 881 bool taking_too_long(void)
 882 {
 883         if (option_timeout &&
 884             (ms_since(&outer_fn_start_time) / 1000) > option_timeout * 5)
 885                 return 1;
 886         return 0;
 887 }
 888 
 889 static int is_last_stmt(struct statement *cur_stmt)
 890 {
 891         struct symbol *fn;
 892         struct statement *stmt;
 893 
 894         if (!cur_func_sym)
 895                 return 0;
 896         fn = get_base_type(cur_func_sym);
 897         if (!fn)
 898                 return 0;
 899         stmt = fn->stmt;
 900         if (!stmt)
 901                 stmt = fn->inline_stmt;
 902         if (!stmt || stmt->type != STMT_COMPOUND)
 903                 return 0;
 904         stmt = last_ptr_list((struct ptr_list *)stmt->stmts);
 905         if (stmt && stmt->type == STMT_LABEL)
 906                 stmt = stmt->label_statement;
 907         if (stmt == cur_stmt)
 908                 return 1;
 909         return 0;
 910 }
 911 
 912 static void handle_backward_goto(struct statement *goto_stmt)
 913 {
 914         const char *goto_name, *label_name;
 915         struct statement *func_stmt;
 916         struct symbol *base_type = get_base_type(cur_func_sym);
 917         struct statement *tmp;
 918         int found = 0;
 919 
 920         if (!option_info)
 921                 return;
 922         if (last_goto_statement_handled)
 923                 return;
 924         last_goto_statement_handled = 1;
 925 
 926         if (!goto_stmt->goto_label ||
 927             goto_stmt->goto_label->type != SYM_LABEL ||
 928             !goto_stmt->goto_label->ident)
 929                 return;
 930         goto_name = goto_stmt->goto_label->ident->name;
 931 
 932         func_stmt = base_type->stmt;
 933         if (!func_stmt)
 934                 func_stmt = base_type->inline_stmt;
 935         if (!func_stmt)
 936                 return;
 937         if (func_stmt->type != STMT_COMPOUND)
 938                 return;
 939 
 940         FOR_EACH_PTR(func_stmt->stmts, tmp) {
 941                 if (!found) {
 942                         if (tmp->type != STMT_LABEL)
 943                                 continue;
 944                         if (!tmp->label_identifier ||
 945                             tmp->label_identifier->type != SYM_LABEL ||
 946                             !tmp->label_identifier->ident)
 947                                 continue;
 948                         label_name = tmp->label_identifier->ident->name;
 949                         if (strcmp(goto_name, label_name) != 0)
 950                                 continue;
 951                         found = 1;
 952                 }
 953                 __split_stmt(tmp);
 954         } END_FOR_EACH_PTR(tmp);
 955 }
 956 
 957 static void fake_a_return(void)
 958 {
 959         struct symbol *return_type;
 960 
 961         nullify_path();
 962         __unnullify_path();
 963 
 964         return_type = get_real_base_type(cur_func_sym);
 965         return_type = get_real_base_type(return_type);
 966         if (return_type != &void_ctype) {
 967                 __pass_to_client(unknown_value_expression(NULL), RETURN_HOOK);
 968                 nullify_path();
 969         }
 970 }
 971 
 972 static void fake_an_empty_default(struct position pos)
 973 {
 974         static struct statement none = {};
 975 
 976         none.pos = pos;
 977         none.type = STMT_NONE;
 978         __merge_switches(top_expression(switch_expr_stack), NULL);
 979         __split_stmt(&none);
 980 }
 981 
 982 static void split_compound(struct statement *stmt)
 983 {
 984         struct statement *prev = NULL;
 985         struct statement *cur = NULL;
 986         struct statement *next;
 987 
 988         __push_scope_hooks();
 989 
 990         FOR_EACH_PTR(stmt->stmts, next) {
 991                 /* just set them all ahead of time */
 992                 stmt_set_parent_stmt(next, stmt);
 993 
 994                 if (cur) {
 995                         __prev_stmt = prev;
 996                         __next_stmt = next;
 997                         __cur_stmt = cur;
 998                         __split_stmt(cur);
 999                 }
1000                 prev = cur;
1001                 cur = next;
1002         } END_FOR_EACH_PTR(next);
1003         if (cur) {
1004                 __prev_stmt = prev;
1005                 __cur_stmt = cur;
1006                 __next_stmt = NULL;
1007                 __split_stmt(cur);
1008         }
1009 
1010         /*
1011          * For function scope, then delay calling the scope hooks until the
1012          * end of function hooks can run.  I'm not positive this is the right
1013          * thing...
1014          */
1015         if (!is_last_stmt(cur))
1016                 __call_scope_hooks();
1017 }
1018 
1019 /*
1020  * This is a hack, work around for detecting empty functions.
1021  */
1022 static int need_delayed_scope_hooks(void)
1023 {
1024         struct symbol *fn = get_base_type(cur_func_sym);
1025         struct statement *stmt;
1026 
1027         if (!fn)
1028                 return 0;
1029         stmt = fn->stmt;
1030         if (!stmt)
1031                 stmt = fn->inline_stmt;
1032         if (stmt && stmt->type == STMT_COMPOUND)
1033                 return 1;
1034         return 0;
1035 }
1036 
1037 void __split_label_stmt(struct statement *stmt)
1038 {
1039         if (stmt->label_identifier &&
1040             stmt->label_identifier->type == SYM_LABEL &&
1041             stmt->label_identifier->ident) {
1042                 loop_count |= 0x0800000;
1043                 __merge_gotos(stmt->label_identifier->ident->name, stmt->label_identifier);
1044         }
1045 }
1046 
1047 static void find_asm_gotos(struct statement *stmt)
1048 {
1049         struct symbol *sym;
1050 
1051         FOR_EACH_PTR(stmt->asm_labels, sym) {
1052                 __save_gotos(sym->ident->name, sym);
1053         } END_FOR_EACH_PTR(sym);
1054 }
1055 
1056 void __split_stmt(struct statement *stmt)
1057 {
1058         sval_t sval;
1059 
1060         if (!stmt)
1061                 goto out;
1062 
1063         if (!__in_fake_assign)
1064                 __silence_warnings_for_stmt = false;
1065 
1066         if (__bail_on_rest_of_function || is_skipped_function())
1067                 return;
1068 
1069         if (out_of_memory() || taking_too_long()) {
1070                 struct timeval stop;
1071 
1072                 gettimeofday(&stop, NULL);
1073 
1074                 __bail_on_rest_of_function = 1;
1075                 final_pass = 1;
1076                 sm_perror("Function too hairy.  Giving up. %lu seconds",
1077                        stop.tv_sec - fn_start_time.tv_sec);
1078                 fake_a_return();
1079                 final_pass = 0;  /* turn off sm_msg() from here */
1080                 return;
1081         }
1082 
1083         add_ptr_list(&big_statement_stack, stmt);
1084         free_expression_stack(&big_expression_stack);
1085         set_position(stmt->pos);
1086         __pass_to_client(stmt, STMT_HOOK);
1087 
1088         switch (stmt->type) {
1089         case STMT_DECLARATION:
1090                 split_declaration(stmt->declaration);
1091                 break;
1092         case STMT_RETURN:
1093                 expr_set_parent_stmt(stmt->ret_value, stmt);
1094 
1095                 __split_expr(stmt->ret_value);
1096                 __pass_to_client(stmt->ret_value, RETURN_HOOK);
1097                 __process_post_op_stack();
1098                 nullify_path();
1099                 break;
1100         case STMT_EXPRESSION:
1101                 expr_set_parent_stmt(stmt->expression, stmt);
1102                 expr_set_parent_stmt(stmt->context, stmt);
1103 
1104                 __split_expr(stmt->expression);
1105                 break;
1106         case STMT_COMPOUND:
1107                 split_compound(stmt);
1108                 break;
1109         case STMT_IF:
1110                 stmt_set_parent_stmt(stmt->if_true, stmt);
1111                 stmt_set_parent_stmt(stmt->if_false, stmt);
1112                 expr_set_parent_stmt(stmt->if_conditional, stmt);
1113 
1114                 if (known_condition_true(stmt->if_conditional)) {
1115                         __split_stmt(stmt->if_true);
1116                         break;
1117                 }
1118                 if (known_condition_false(stmt->if_conditional)) {
1119                         __split_stmt(stmt->if_false);
1120                         break;
1121                 }
1122                 __split_whole_condition(stmt->if_conditional);
1123                 __split_stmt(stmt->if_true);
1124                 if (empty_statement(stmt->if_true) &&
1125                         last_stmt_on_same_line() &&
1126                         !get_macro_name(stmt->if_true->pos))
1127                         sm_warning("if();");
1128                 __push_true_states();
1129                 __use_false_states();
1130                 __split_stmt(stmt->if_false);
1131                 __merge_true_states();
1132                 break;
1133         case STMT_ITERATOR:
1134                 stmt_set_parent_stmt(stmt->iterator_pre_statement, stmt);
1135                 stmt_set_parent_stmt(stmt->iterator_statement, stmt);
1136                 stmt_set_parent_stmt(stmt->iterator_post_statement, stmt);
1137                 expr_set_parent_stmt(stmt->iterator_pre_condition, stmt);
1138                 expr_set_parent_stmt(stmt->iterator_post_condition, stmt);
1139 
1140                 if (stmt->iterator_pre_condition)
1141                         handle_pre_loop(stmt);
1142                 else if (stmt->iterator_post_condition)
1143                         handle_post_loop(stmt);
1144                 else {
1145                         // these are for(;;) type loops.
1146                         handle_pre_loop(stmt);
1147                 }
1148                 break;
1149         case STMT_SWITCH:
1150                 stmt_set_parent_stmt(stmt->switch_statement, stmt);
1151                 expr_set_parent_stmt(stmt->switch_expression, stmt);
1152 
1153                 if (get_value(stmt->switch_expression, &sval)) {
1154                         split_known_switch(stmt, sval);
1155                         break;
1156                 }
1157                 __split_expr(stmt->switch_expression);
1158                 push_expression(&switch_expr_stack, stmt->switch_expression);
1159                 __save_switch_states(top_expression(switch_expr_stack));
1160                 nullify_path();
1161                 __push_default();
1162                 __push_breaks();
1163                 __split_stmt(stmt->switch_statement);
1164                 if (!__pop_default() && have_remaining_cases())
1165                         fake_an_empty_default(stmt->pos);
1166                 __discard_switches();
1167                 __merge_breaks();
1168                 pop_expression(&switch_expr_stack);
1169                 break;
1170         case STMT_CASE:
1171                 split_case(stmt);
1172                 break;
1173         case STMT_LABEL:
1174                 __split_label_stmt(stmt);
1175                 __split_stmt(stmt->label_statement);
1176                 break;
1177         case STMT_GOTO:
1178                 expr_set_parent_stmt(stmt->goto_expression, stmt);
1179 
1180                 __split_expr(stmt->goto_expression);
1181                 if (stmt->goto_label && stmt->goto_label->type == SYM_NODE) {
1182                         if (!strcmp(stmt->goto_label->ident->name, "break")) {
1183                                 __process_breaks();
1184                         } else if (!strcmp(stmt->goto_label->ident->name,
1185                                            "continue")) {
1186                                 __process_continues();
1187                         }
1188                 } else if (stmt->goto_label &&
1189                            stmt->goto_label->type == SYM_LABEL &&
1190                            stmt->goto_label->ident) {
1191                         __save_gotos(stmt->goto_label->ident->name, stmt->goto_label);
1192                 }
1193                 nullify_path();
1194                 if (is_last_stmt(stmt))
1195                         handle_backward_goto(stmt);
1196                 break;
1197         case STMT_NONE:
1198                 break;
1199         case STMT_ASM:
1200                 expr_set_parent_stmt(stmt->asm_string, stmt);
1201 
1202                 find_asm_gotos(stmt);
1203                 __pass_to_client(stmt, ASM_HOOK);
1204                 __split_expr(stmt->asm_string);
1205                 split_asm_constraints(stmt->asm_outputs);
1206                 split_asm_constraints(stmt->asm_inputs);
1207                 split_asm_constraints(stmt->asm_clobbers);
1208                 break;
1209         case STMT_CONTEXT:
1210                 break;
1211         case STMT_RANGE:
1212                 __split_expr(stmt->range_expression);
1213                 __split_expr(stmt->range_low);
1214                 __split_expr(stmt->range_high);
1215                 break;
1216         }
1217         __pass_to_client(stmt, STMT_HOOK_AFTER);
1218 out:
1219         __process_post_op_stack();
1220 }
1221 
1222 static void split_expr_list(struct expression_list *expr_list, struct expression *parent)
1223 {
1224         struct expression *expr;
1225 
1226         FOR_EACH_PTR(expr_list, expr) {
1227                 expr_set_parent_expr(expr, parent);
1228                 __split_expr(expr);
1229                 __process_post_op_stack();
1230         } END_FOR_EACH_PTR(expr);
1231 }
1232 
1233 static void split_sym(struct symbol *sym)
1234 {
1235         if (!sym)
1236                 return;
1237         if (!(sym->namespace & NS_SYMBOL))
1238                 return;
1239 
1240         __split_stmt(sym->stmt);
1241         __split_expr(sym->array_size);
1242         split_symlist(sym->arguments);
1243         split_symlist(sym->symbol_list);
1244         __split_stmt(sym->inline_stmt);
1245         split_symlist(sym->inline_symbol_list);
1246 }
1247 
1248 static void split_symlist(struct symbol_list *sym_list)
1249 {
1250         struct symbol *sym;
1251 
1252         FOR_EACH_PTR(sym_list, sym) {
1253                 split_sym(sym);
1254         } END_FOR_EACH_PTR(sym);
1255 }
1256 
1257 typedef void (fake_cb)(struct expression *expr);
1258 
1259 static int member_to_number(struct expression *expr, struct ident *member)
1260 {
1261         struct symbol *type, *tmp;
1262         char *name;
1263         int i;
1264 
1265         if (!member)
1266                 return -1;
1267         name = member->name;
1268 
1269         type = get_type(expr);
1270         if (!type || type->type != SYM_STRUCT)
1271                 return -1;
1272 
1273         i = -1;
1274         FOR_EACH_PTR(type->symbol_list, tmp) {
1275                 i++;
1276                 if (!tmp->ident)
1277                         continue;
1278                 if (strcmp(name, tmp->ident->name) == 0)
1279                         return i;
1280         } END_FOR_EACH_PTR(tmp);
1281         return -1;
1282 }
1283 
1284 static struct ident *number_to_member(struct expression *expr, int num)
1285 {
1286         struct symbol *type, *member;
1287         int i = 0;
1288 
1289         type = get_type(expr);
1290         if (!type || type->type != SYM_STRUCT)
1291                 return NULL;
1292 
1293         FOR_EACH_PTR(type->symbol_list, member) {
1294                 if (i == num)
1295                         return member->ident;
1296                 i++;
1297         } END_FOR_EACH_PTR(member);
1298         return NULL;
1299 }
1300 
1301 static void fake_element_assigns_helper(struct expression *array, struct expression_list *expr_list, fake_cb *fake_cb);
1302 
1303 static void set_inner_struct_members(struct expression *expr, struct symbol *member)
1304 {
1305         struct expression *edge_member, *assign;
1306         struct symbol *base = get_real_base_type(member);
1307         struct symbol *tmp;
1308 
1309         if (member->ident)
1310                 expr = member_expression(expr, '.', member->ident);
1311 
1312         FOR_EACH_PTR(base->symbol_list, tmp) {
1313                 struct symbol *type;
1314 
1315                 type = get_real_base_type(tmp);
1316                 if (!type)
1317                         continue;
1318 
1319                 edge_member = member_expression(expr, '.', tmp->ident);
1320                 if (get_extra_state(edge_member))
1321                         continue;
1322 
1323                 if (type->type == SYM_UNION || type->type == SYM_STRUCT) {
1324                         set_inner_struct_members(expr, tmp);
1325                         continue;
1326                 }
1327 
1328                 if (!tmp->ident)
1329                         continue;
1330 
1331                 assign = assign_expression(edge_member, '=', zero_expr());
1332                 __split_expr(assign);
1333         } END_FOR_EACH_PTR(tmp);
1334 
1335 
1336 }
1337 
1338 static void set_unset_to_zero(struct symbol *type, struct expression *expr)
1339 {
1340         struct symbol *tmp;
1341         struct expression *member = NULL;
1342         struct expression *assign;
1343         int op = '*';
1344 
1345         if (expr->type == EXPR_PREOP && expr->op == '&') {
1346                 expr = strip_expr(expr->unop);
1347                 op = '.';
1348         }
1349 
1350         FOR_EACH_PTR(type->symbol_list, tmp) {
1351                 type = get_real_base_type(tmp);
1352                 if (!type)
1353                         continue;
1354 
1355                 if (tmp->ident) {
1356                         member = member_expression(expr, op, tmp->ident);
1357                         if (get_extra_state(member))
1358                                 continue;
1359                 }
1360 
1361                 if (type->type == SYM_UNION || type->type == SYM_STRUCT) {
1362                         set_inner_struct_members(expr, tmp);
1363                         continue;
1364                 }
1365                 if (type->type == SYM_ARRAY)
1366                         continue;
1367                 if (!tmp->ident)
1368                         continue;
1369 
1370                 assign = assign_expression(member, '=', zero_expr());
1371                 __split_expr(assign);
1372         } END_FOR_EACH_PTR(tmp);
1373 }
1374 
1375 static void fake_member_assigns_helper(struct expression *symbol, struct expression_list *members, fake_cb *fake_cb)
1376 {
1377         struct expression *deref, *assign, *tmp, *right;
1378         struct symbol *struct_type, *type;
1379         struct ident *member;
1380         int member_idx;
1381 
1382         struct_type = get_type(symbol);
1383         if (!struct_type ||
1384             (struct_type->type != SYM_STRUCT && struct_type->type != SYM_UNION))
1385                 return;
1386 
1387         /*
1388          * We're parsing an initializer that could look something like this:
1389          * struct foo foo = {
1390          *      42,
1391          *      .whatever.xxx = 11,
1392          *      .zzz = 12,
1393          * };
1394          *
1395          * So what we have here is a list with 42, .whatever, and .zzz.  We need
1396          * to break it up into left and right sides of the assignments.
1397          *
1398          */
1399         member_idx = 0;
1400         FOR_EACH_PTR(members, tmp) {
1401                 deref = NULL;
1402                 if (tmp->type == EXPR_IDENTIFIER) {
1403                         member_idx = member_to_number(symbol, tmp->expr_ident);
1404                         while (tmp->type == EXPR_IDENTIFIER) {
1405                                 member = tmp->expr_ident;
1406                                 tmp = tmp->ident_expression;
1407                                 if (deref)
1408                                         deref = member_expression(deref, '.', member);
1409                                 else
1410                                         deref = member_expression(symbol, '.', member);
1411                         }
1412                 } else {
1413                         member = number_to_member(symbol, member_idx);
1414                         deref = member_expression(symbol, '.', member);
1415                 }
1416                 right = tmp;
1417                 member_idx++;
1418                 if (right->type == EXPR_INITIALIZER) {
1419                         type = get_type(deref);
1420                         if (type && type->type == SYM_ARRAY)
1421                                 fake_element_assigns_helper(deref, right->expr_list, fake_cb);
1422                         else
1423                                 fake_member_assigns_helper(deref, right->expr_list, fake_cb);
1424                 } else {
1425                         assign = assign_expression(deref, '=', right);
1426                         fake_cb(assign);
1427                 }
1428         } END_FOR_EACH_PTR(tmp);
1429 
1430         set_unset_to_zero(struct_type, symbol);
1431 }
1432 
1433 static void fake_member_assigns(struct symbol *sym, fake_cb *fake_cb)
1434 {
1435         fake_member_assigns_helper(symbol_expression(sym),
1436                                    sym->initializer->expr_list, fake_cb);
1437 }
1438 
1439 static void fake_element_assigns_helper(struct expression *array, struct expression_list *expr_list, fake_cb *fake_cb)
1440 {
1441         struct expression *offset, *binop, *assign, *tmp;
1442         struct symbol *type;
1443         int idx;
1444 
1445         if (ptr_list_size((struct ptr_list *)expr_list) > 1000)
1446                 return;
1447 
1448         idx = 0;
1449         FOR_EACH_PTR(expr_list, tmp) {
1450                 if (tmp->type == EXPR_INDEX) {
1451                         if (tmp->idx_from != tmp->idx_to)
1452                                 return;
1453                         idx = tmp->idx_from;
1454                         if (!tmp->idx_expression)
1455                                 goto next;
1456                         tmp = tmp->idx_expression;
1457                 }
1458                 offset = value_expr(idx);
1459                 binop = array_element_expression(array, offset);
1460                 if (tmp->type == EXPR_INITIALIZER) {
1461                         type = get_type(binop);
1462                         if (type && type->type == SYM_ARRAY)
1463                                 fake_element_assigns_helper(binop, tmp->expr_list, fake_cb);
1464                         else
1465                                 fake_member_assigns_helper(binop, tmp->expr_list, fake_cb);
1466                 } else {
1467                         assign = assign_expression(binop, '=', tmp);
1468                         fake_cb(assign);
1469                 }
1470 next:
1471                 idx++;
1472         } END_FOR_EACH_PTR(tmp);
1473 }
1474 
1475 static void fake_element_assigns(struct symbol *sym, fake_cb *fake_cb)
1476 {
1477         fake_element_assigns_helper(symbol_expression(sym), sym->initializer->expr_list, fake_cb);
1478 }
1479 
1480 static void fake_assign_expr(struct symbol *sym)
1481 {
1482         struct expression *assign, *symbol;
1483 
1484         symbol = symbol_expression(sym);
1485         assign = assign_expression(symbol, '=', sym->initializer);
1486         __split_expr(assign);
1487 }
1488 
1489 static void do_initializer_stuff(struct symbol *sym)
1490 {
1491         if (!sym->initializer)
1492                 return;
1493 
1494         if (sym->initializer->type == EXPR_INITIALIZER) {
1495                 if (get_real_base_type(sym)->type == SYM_ARRAY)
1496                         fake_element_assigns(sym, __split_expr);
1497                 else
1498                         fake_member_assigns(sym, __split_expr);
1499         } else {
1500                 fake_assign_expr(sym);
1501         }
1502 }
1503 
1504 static void split_declaration(struct symbol_list *sym_list)
1505 {
1506         struct symbol *sym;
1507 
1508         FOR_EACH_PTR(sym_list, sym) {
1509                 __pass_to_client(sym, DECLARATION_HOOK);
1510                 do_initializer_stuff(sym);
1511                 split_sym(sym);
1512         } END_FOR_EACH_PTR(sym);
1513 }
1514 
1515 static void call_global_assign_hooks(struct expression *assign)
1516 {
1517         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1518 }
1519 
1520 static void fake_global_assign(struct symbol *sym)
1521 {
1522         struct expression *assign, *symbol;
1523 
1524         if (get_real_base_type(sym)->type == SYM_ARRAY) {
1525                 if (sym->initializer && sym->initializer->type == EXPR_INITIALIZER) {
1526                         fake_element_assigns(sym, call_global_assign_hooks);
1527                 } else if (sym->initializer) {
1528                         symbol = symbol_expression(sym);
1529                         assign = assign_expression(symbol, '=', sym->initializer);
1530                         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1531                 } else {
1532                         fake_element_assigns_helper(symbol_expression(sym), NULL, call_global_assign_hooks);
1533                 }
1534         } else if (get_real_base_type(sym)->type == SYM_STRUCT) {
1535                 if (sym->initializer && sym->initializer->type == EXPR_INITIALIZER) {
1536                         fake_member_assigns(sym, call_global_assign_hooks);
1537                 } else if (sym->initializer) {
1538                         symbol = symbol_expression(sym);
1539                         assign = assign_expression(symbol, '=', sym->initializer);
1540                         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1541                 } else {
1542                         fake_member_assigns_helper(symbol_expression(sym), NULL, call_global_assign_hooks);
1543                 }
1544         } else {
1545                 symbol = symbol_expression(sym);
1546                 if (sym->initializer) {
1547                         assign = assign_expression(symbol, '=', sym->initializer);
1548                         __split_expr(assign);
1549                 } else {
1550                         assign = assign_expression(symbol, '=', zero_expr());
1551                 }
1552                 __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1553         }
1554 }
1555 
1556 static void start_function_definition(struct symbol *sym)
1557 {
1558         __in_function_def = 1;
1559         __pass_to_client(sym, FUNC_DEF_HOOK);
1560         __in_function_def = 0;
1561         __pass_to_client(sym, AFTER_DEF_HOOK);
1562 
1563 }
1564 
1565 static void split_function(struct symbol *sym)
1566 {
1567         struct symbol *base_type = get_base_type(sym);
1568         struct timeval stop;
1569 
1570         if (!base_type->stmt && !base_type->inline_stmt)
1571                 return;
1572 
1573         gettimeofday(&outer_fn_start_time, NULL);
1574         gettimeofday(&fn_start_time, NULL);
1575         cur_func_sym = sym;
1576         if (sym->ident)
1577                 cur_func = sym->ident->name;
1578         set_position(sym->pos);
1579         loop_count = 0;
1580         last_goto_statement_handled = 0;
1581         sm_debug("new function:  %s\n", cur_func);
1582         __stree_id = 0;
1583         if (option_two_passes) {
1584                 __unnullify_path();
1585                 loop_num = 0;
1586                 final_pass = 0;
1587                 start_function_definition(sym);
1588                 __split_stmt(base_type->stmt);
1589                 __split_stmt(base_type->inline_stmt);
1590                 nullify_path();
1591         }
1592         __unnullify_path();
1593         loop_num = 0;
1594         final_pass = 1;
1595         start_function_definition(sym);
1596         __split_stmt(base_type->stmt);
1597         __split_stmt(base_type->inline_stmt);
1598         __pass_to_client(sym, END_FUNC_HOOK);
1599         if (need_delayed_scope_hooks())
1600                 __call_scope_hooks();
1601         __pass_to_client(sym, AFTER_FUNC_HOOK);
1602 
1603         clear_all_states();
1604 
1605         gettimeofday(&stop, NULL);
1606         if (option_time && stop.tv_sec - fn_start_time.tv_sec > 2) {
1607                 final_pass++;
1608                 sm_msg("func_time: %lu", stop.tv_sec - fn_start_time.tv_sec);
1609                 final_pass--;
1610         }
1611         cur_func_sym = NULL;
1612         cur_func = NULL;
1613         free_data_info_allocs();
1614         free_expression_stack(&switch_expr_stack);
1615         __free_ptr_list((struct ptr_list **)&big_statement_stack);
1616         __bail_on_rest_of_function = 0;
1617 }
1618 
1619 static void save_flow_state(void)
1620 {
1621         __add_ptr_list(&backup, INT_PTR(loop_num << 2));
1622         __add_ptr_list(&backup, INT_PTR(loop_count << 2));
1623         __add_ptr_list(&backup, INT_PTR(final_pass << 2));
1624 
1625         __add_ptr_list(&backup, big_statement_stack);
1626         __add_ptr_list(&backup, big_expression_stack);
1627         __add_ptr_list(&backup, big_condition_stack);
1628         __add_ptr_list(&backup, switch_expr_stack);
1629 
1630         __add_ptr_list(&backup, cur_func_sym);
1631 
1632         __add_ptr_list(&backup, __prev_stmt);
1633         __add_ptr_list(&backup, __cur_stmt);
1634         __add_ptr_list(&backup, __next_stmt);
1635 }
1636 
1637 static void *pop_backup(void)
1638 {
1639         void *ret;
1640 
1641         ret = last_ptr_list(backup);
1642         delete_ptr_list_last(&backup);
1643         return ret;
1644 }
1645 
1646 static void restore_flow_state(void)
1647 {
1648         __next_stmt = pop_backup();
1649         __cur_stmt = pop_backup();
1650         __prev_stmt = pop_backup();
1651 
1652         cur_func_sym = pop_backup();
1653         switch_expr_stack = pop_backup();
1654         big_condition_stack = pop_backup();
1655         big_expression_stack = pop_backup();
1656         big_statement_stack = pop_backup();
1657         final_pass = PTR_INT(pop_backup()) >> 2;
1658         loop_count = PTR_INT(pop_backup()) >> 2;
1659         loop_num = PTR_INT(pop_backup()) >> 2;
1660 }
1661 
1662 static void parse_inline(struct expression *call)
1663 {
1664         struct symbol *base_type;
1665         char *cur_func_bak = cur_func;  /* not aligned correctly for backup */
1666         struct timeval time_backup = fn_start_time;
1667         struct expression *orig_inline = __inline_fn;
1668         int orig_budget;
1669 
1670         if (out_of_memory() || taking_too_long())
1671                 return;
1672 
1673         save_flow_state();
1674 
1675         __pass_to_client(call, INLINE_FN_START);
1676         final_pass = 0;  /* don't print anything */
1677         __inline_fn = call;
1678         orig_budget = inline_budget;
1679         inline_budget = inline_budget - 5;
1680 
1681         base_type = get_base_type(call->fn->symbol);
1682         cur_func_sym = call->fn->symbol;
1683         if (call->fn->symbol->ident)
1684                 cur_func = call->fn->symbol->ident->name;
1685         else
1686                 cur_func = NULL;
1687         set_position(call->fn->symbol->pos);
1688 
1689         save_all_states();
1690         big_statement_stack = NULL;
1691         big_expression_stack = NULL;
1692         big_condition_stack = NULL;
1693         switch_expr_stack = NULL;
1694 
1695         sm_debug("inline function:  %s\n", cur_func);
1696         __unnullify_path();
1697         loop_num = 0;
1698         loop_count = 0;
1699         start_function_definition(call->fn->symbol);
1700         __split_stmt(base_type->stmt);
1701         __split_stmt(base_type->inline_stmt);
1702         __pass_to_client(call->fn->symbol, END_FUNC_HOOK);
1703         __pass_to_client(call->fn->symbol, AFTER_FUNC_HOOK);
1704 
1705         free_expression_stack(&switch_expr_stack);
1706         __free_ptr_list((struct ptr_list **)&big_statement_stack);
1707         nullify_path();
1708         free_goto_stack();
1709 
1710         restore_flow_state();
1711         fn_start_time = time_backup;
1712         cur_func = cur_func_bak;
1713 
1714         restore_all_states();
1715         set_position(call->pos);
1716         __inline_fn = orig_inline;
1717         inline_budget = orig_budget;
1718         __pass_to_client(call, INLINE_FN_END);
1719 }
1720 
1721 static struct symbol_list *inlines_called;
1722 static void add_inline_function(struct symbol *sym)
1723 {
1724         static struct symbol_list *already_added;
1725         struct symbol *tmp;
1726 
1727         FOR_EACH_PTR(already_added, tmp) {
1728                 if (tmp == sym)
1729                         return;
1730         } END_FOR_EACH_PTR(tmp);
1731 
1732         add_ptr_list(&already_added, sym);
1733         add_ptr_list(&inlines_called, sym);
1734 }
1735 
1736 static void process_inlines(void)
1737 {
1738         struct symbol *tmp;
1739 
1740         FOR_EACH_PTR(inlines_called, tmp) {
1741                 split_function(tmp);
1742         } END_FOR_EACH_PTR(tmp);
1743         free_ptr_list(&inlines_called);
1744 }
1745 
1746 static struct symbol *get_last_scoped_symbol(struct symbol_list *big_list, int use_static)
1747 {
1748         struct symbol *sym;
1749 
1750         FOR_EACH_PTR_REVERSE(big_list, sym) {
1751                 if (!sym->scope)
1752                         continue;
1753                 if (use_static && sym->ctype.modifiers & MOD_STATIC)
1754                         return sym;
1755                 if (!use_static && !(sym->ctype.modifiers & MOD_STATIC))
1756                         return sym;
1757         } END_FOR_EACH_PTR_REVERSE(sym);
1758 
1759         return NULL;
1760 }
1761 
1762 static bool interesting_function(struct symbol *sym)
1763 {
1764         static int prev_stream = -1;
1765         static bool prev_answer;
1766         const char *filename;
1767         int len;
1768 
1769         if (!(sym->ctype.modifiers & MOD_INLINE))
1770                 return true;
1771 
1772         if (sym->pos.stream == prev_stream)
1773                 return prev_answer;
1774 
1775         prev_stream = sym->pos.stream;
1776         prev_answer = false;
1777 
1778         filename = stream_name(sym->pos.stream);
1779         len = strlen(filename);
1780         if (len > 0 && filename[len - 1] == 'c')
1781                 prev_answer = true;
1782         return prev_answer;
1783 }
1784 
1785 static void split_inlines_in_scope(struct symbol *sym)
1786 {
1787         struct symbol *base;
1788         struct symbol_list *scope_list;
1789         int stream;
1790 
1791         scope_list = sym->scope->symbols;
1792         stream = sym->pos.stream;
1793 
1794         /* find the last static symbol in the file */
1795         FOR_EACH_PTR_REVERSE(scope_list, sym) {
1796                 if (sym->pos.stream != stream)
1797                         continue;
1798                 if (sym->type != SYM_NODE)
1799                         continue;
1800                 base = get_base_type(sym);
1801                 if (!base)
1802                         continue;
1803                 if (base->type != SYM_FN)
1804                         continue;
1805                 if (!base->inline_stmt)
1806                         continue;
1807                 if (!interesting_function(sym))
1808                         continue;
1809                 add_inline_function(sym);
1810         } END_FOR_EACH_PTR_REVERSE(sym);
1811 
1812         process_inlines();
1813 }
1814 
1815 static void split_inlines(struct symbol_list *sym_list)
1816 {
1817         struct symbol *sym;
1818 
1819         sym = get_last_scoped_symbol(sym_list, 0);
1820         if (sym)
1821                 split_inlines_in_scope(sym);
1822         sym = get_last_scoped_symbol(sym_list, 1);
1823         if (sym)
1824                 split_inlines_in_scope(sym);
1825 }
1826 
1827 static struct stree *clone_estates_perm(struct stree *orig)
1828 {
1829         struct stree *ret = NULL;
1830         struct sm_state *tmp;
1831 
1832         FOR_EACH_SM(orig, tmp) {
1833                 set_state_stree_perm(&ret, tmp->owner, tmp->name, tmp->sym, clone_estate_perm(tmp->state));
1834         } END_FOR_EACH_SM(tmp);
1835 
1836         return ret;
1837 }
1838 
1839 struct position last_pos;
1840 static void split_c_file_functions(struct symbol_list *sym_list)
1841 {
1842         struct symbol *sym;
1843 
1844         __unnullify_path();
1845         FOR_EACH_PTR(sym_list, sym) {
1846                 set_position(sym->pos);
1847                 if (sym->type != SYM_NODE || get_base_type(sym)->type != SYM_FN) {
1848                         __pass_to_client(sym, BASE_HOOK);
1849                         fake_global_assign(sym);
1850                 }
1851         } END_FOR_EACH_PTR(sym);
1852         global_states = clone_estates_perm(get_all_states_stree(SMATCH_EXTRA));
1853         nullify_path();
1854 
1855         FOR_EACH_PTR(sym_list, sym) {
1856                 set_position(sym->pos);
1857                 last_pos = sym->pos;
1858                 if (!interesting_function(sym))
1859                         continue;
1860                 if (sym->type == SYM_NODE && get_base_type(sym)->type == SYM_FN) {
1861                         split_function(sym);
1862                         process_inlines();
1863                 }
1864                 last_pos = sym->pos;
1865         } END_FOR_EACH_PTR(sym);
1866         split_inlines(sym_list);
1867         __pass_to_client(sym_list, END_FILE_HOOK);
1868 }
1869 
1870 static int final_before_fake;
1871 void init_fake_env(void)
1872 {
1873         if (!in_fake_env)
1874                 final_before_fake = final_pass;
1875         in_fake_env++;
1876         __push_fake_cur_stree();
1877         final_pass = 0;
1878 }
1879 
1880 void end_fake_env(void)
1881 {
1882         __pop_fake_cur_stree();
1883         in_fake_env--;
1884         if (!in_fake_env)
1885                 final_pass = final_before_fake;
1886 }
1887 
1888 static void open_output_files(char *base_file)
1889 {
1890         char buf[256];
1891 
1892         snprintf(buf, sizeof(buf), "%s.smatch", base_file);
1893         sm_outfd = fopen(buf, "w");
1894         if (!sm_outfd)
1895                 sm_fatal("Cannot open %s", buf);
1896 
1897         if (!option_info)
1898                 return;
1899 
1900         snprintf(buf, sizeof(buf), "%s.smatch.sql", base_file);
1901         sql_outfd = fopen(buf, "w");
1902         if (!sql_outfd)
1903                 sm_fatal("Error:  Cannot open %s", buf);
1904 
1905         snprintf(buf, sizeof(buf), "%s.smatch.caller_info", base_file);
1906         caller_info_fd = fopen(buf, "w");
1907         if (!caller_info_fd)
1908                 sm_fatal("Error:  Cannot open %s", buf);
1909 }
1910 
1911 void smatch(struct string_list *filelist)
1912 {
1913         struct symbol_list *sym_list;
1914         struct timeval stop, start;
1915         char *path;
1916         int len;
1917 
1918         gettimeofday(&start, NULL);
1919 
1920         FOR_EACH_PTR_NOTAG(filelist, base_file) {
1921                 path = getcwd(NULL, 0);
1922                 free(full_base_file);
1923                 if (path) {
1924                         len = strlen(path) + 1 + strlen(base_file) + 1;
1925                         full_base_file = malloc(len);
1926                         snprintf(full_base_file, len, "%s/%s", path, base_file);
1927                 } else {
1928                         full_base_file = alloc_string(base_file);
1929                 }
1930                 if (option_file_output)
1931                         open_output_files(base_file);
1932                 sym_list = sparse_keep_tokens(base_file);
1933                 split_c_file_functions(sym_list);
1934         } END_FOR_EACH_PTR_NOTAG(base_file);
1935 
1936         gettimeofday(&stop, NULL);
1937 
1938         set_position(last_pos);
1939         final_pass = 1;
1940         if (option_time)
1941                 sm_msg("time: %lu", stop.tv_sec - start.tv_sec);
1942         if (option_mem)
1943                 sm_msg("mem: %luKb", get_max_memory());
1944 }