smatch_flow.c

   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 static struct expression_list *switch_expr_stack = NULL;
  48 static struct expression_list *post_op_stack = NULL;
  49
  50 static struct ptr_list *backup;
  51
  52 struct expression_list *big_expression_stack;
  53 struct statement_list *big_statement_stack;
  54 struct statement *__prev_stmt;
  55 struct statement *__cur_stmt;
  56 struct statement *__next_stmt;
  57 int __in_pre_condition = 0;
  58 int __bail_on_rest_of_function = 0;
  59 static struct timeval fn_start_time;
  60 char *get_function(void) { return cur_func; }
  61 int get_lineno(void) { return __smatch_lineno; }
  62 int inside_loop(void) { return !!loop_count; }
  63 int definitely_inside_loop(void) { return !!(loop_count & ~0x08000000); }
  64 struct expression *get_switch_expr(void) { return top_expression(switch_expr_stack); }
  65 int in_expression_statement(void) { return !!__expr_stmt_count; }
  66
  67 static void split_symlist(struct symbol_list *sym_list);
  68 static void split_declaration(struct symbol_list *sym_list);
  69 static void split_expr_list(struct expression_list *expr_list, struct expression *parent);
  70 static void add_inline_function(struct symbol *sym);
  71 static void parse_inline(struct expression *expr);
  72
  73 int option_assume_loops = 0;
  74 int option_two_passes = 0;
  75 struct symbol *cur_func_sym = NULL;
  76 struct stree *global_states;
  77
  78 long long valid_ptr_min = 4096;
  79 long long valid_ptr_max = 2117777777;
  80 sval_t valid_ptr_min_sval = {
  81         .type = &ptr_ctype,
  82         {.value = 4096},
  83 };
  84 sval_t valid_ptr_max_sval = {
  85         .type = &ptr_ctype,
  86         {.value = LONG_MAX - 100000},
  87 };
  88 struct range_list *valid_ptr_rl;
  89
  90 static void set_valid_ptr_max(void)
  91 {
  92         if (type_bits(&ptr_ctype) == 32)
  93                 valid_ptr_max = 2117777777;
  94         else if (type_bits(&ptr_ctype) == 64)
  95                 valid_ptr_max = 2117777777777777777LL;
  96
  97         valid_ptr_max_sval.value = valid_ptr_max;
  98 }
  99
 100 static void alloc_valid_ptr_rl(void)
 101 {
 102         valid_ptr_rl = alloc_rl(valid_ptr_min_sval, valid_ptr_max_sval);
 103         valid_ptr_rl = cast_rl(&ptr_ctype, valid_ptr_rl);
 104         valid_ptr_rl = clone_rl_permanent(valid_ptr_rl);
 105 }
 106
 107 int outside_of_function(void)
 108 {
 109         return cur_func_sym == NULL;
 110 }
 111
 112 const char *get_filename(void)
 113 {
 114         if (option_info && option_full_path)
 115                 return full_base_file;
 116         if (option_info)
 117                 return base_file;
 118         if (option_full_path)
 119                 return full_filename;
 120         return filename;
 121 }
 122
 123 const char *get_base_file(void)
 124 {
 125         if (option_full_path)
 126                 return full_base_file;
 127         return base_file;
 128 }
 129
 130 static void set_position(struct position pos)
 131 {
 132         int len;
 133         static int prev_stream = -1;
 134
 135         if (in_fake_env)
 136                 return;
 137
 138         if (pos.stream == 0 && pos.line == 0)
 139                 return;
 140
 141         __smatch_lineno = pos.line;
 142
 143         if (pos.stream == prev_stream)
 144                 return;
 145
 146         filename = stream_name(pos.stream);
 147
 148         free(full_filename);
 149         pathname = getcwd(NULL, 0);
 150         if (pathname) {
 151                 len = strlen(pathname) + 1 + strlen(filename) + 1;
 152                 full_filename = malloc(len);
 153                 snprintf(full_filename, len, "%s/%s", pathname, filename);
 154         } else {
 155                 full_filename = alloc_string(filename);
 156         }
 157         free(pathname);
 158 }
 159
 160 int is_assigned_call(struct expression *expr)
 161 {
 162         struct expression *parent = expr_get_parent_expr(expr);
 163
 164         if (parent &&
 165             parent->type == EXPR_ASSIGNMENT &&
 166             parent->op == '=' &&
 167             strip_expr(parent->right) == expr)
 168                 return 1;
 169
 170         return 0;
 171 }
 172
 173 static int is_inline_func(struct expression *expr)
 174 {
 175         if (expr->type != EXPR_SYMBOL || !expr->symbol)
 176                 return 0;
 177         if (expr->symbol->ctype.modifiers & MOD_INLINE)
 178                 return 1;
 179         return 0;
 180 }
 181
 182 static int is_noreturn_func(struct expression *expr)
 183 {
 184         if (expr->type != EXPR_SYMBOL || !expr->symbol)
 185                 return 0;
 186         if (expr->symbol->ctype.modifiers & MOD_NORETURN)
 187                 return 1;
 188         return 0;
 189 }
 190
 191 static int inline_budget = 20;
 192
 193 int inlinable(struct expression *expr)
 194 {
 195         struct symbol *sym;
 196         struct statement *last_stmt = NULL;
 197
 198         if (__inline_fn)  /* don't nest */
 199                 return 0;
 200
 201         if (expr->type != EXPR_SYMBOL || !expr->symbol)
 202                 return 0;
 203         if (is_no_inline_function(expr->symbol->ident->name))
 204                 return 0;
 205         sym = get_base_type(expr->symbol);
 206         if (sym->stmt && sym->stmt->type == STMT_COMPOUND) {
 207                 if (ptr_list_size((struct ptr_list *)sym->stmt->stmts) > 10)
 208                         return 0;
 209                 if (sym->stmt->type != STMT_COMPOUND)
 210                         return 0;
 211                 last_stmt = last_ptr_list((struct ptr_list *)sym->stmt->stmts);
 212         }
 213         if (sym->inline_stmt && sym->inline_stmt->type == STMT_COMPOUND) {
 214                 if (ptr_list_size((struct ptr_list *)sym->inline_stmt->stmts) > 10)
 215                         return 0;
 216                 if (sym->inline_stmt->type != STMT_COMPOUND)
 217                         return 0;
 218                 last_stmt = last_ptr_list((struct ptr_list *)sym->inline_stmt->stmts);
 219         }
 220
 221         if (!last_stmt)
 222                 return 0;
 223
 224         /* the magic numbers in this function are pulled out of my bum. */
 225         if (last_stmt->pos.line > sym->pos.line + inline_budget)
 226                 return 0;
 227
 228         return 1;
 229 }
 230
 231 void __process_post_op_stack(void)
 232 {
 233         struct expression *expr;
 234
 235         FOR_EACH_PTR(post_op_stack, expr) {
 236                 __pass_to_client(expr, OP_HOOK);
 237         } END_FOR_EACH_PTR(expr);
 238
 239         __free_ptr_list((struct ptr_list **)&post_op_stack);
 240 }
 241
 242 static int handle_comma_assigns(struct expression *expr)
 243 {
 244         struct expression *right;
 245         struct expression *assign;
 246
 247         right = strip_expr(expr->right);
 248         if (right->type != EXPR_COMMA)
 249                 return 0;
 250
 251         __split_expr(right->left);
 252         __process_post_op_stack();
 253
 254         assign = assign_expression(expr->left, '=', right->right);
 255         __split_expr(assign);
 256
 257         return 1;
 258 }
 259
 260 /* This is to handle *p++ = foo; assignments */
 261 static int handle_postop_assigns(struct expression *expr)
 262 {
 263         struct expression *left, *fake_left;
 264         struct expression *assign;
 265
 266         left = strip_expr(expr->left);
 267         if (left->type != EXPR_PREOP || left->op != '*')
 268                 return 0;
 269         left = strip_expr(left->unop);
 270         if (left->type != EXPR_POSTOP)
 271                 return 0;
 272
 273         fake_left = deref_expression(strip_expr(left->unop));
 274         assign = assign_expression(fake_left, '=', expr->right);
 275
 276         __split_expr(assign);
 277         __split_expr(expr->left);
 278
 279         return 1;
 280 }
 281
 282 static int prev_expression_is_getting_address(struct expression *expr)
 283 {
 284         struct expression *parent;
 285
 286         do {
 287                 parent = expr_get_parent_expr(expr);
 288
 289                 if (!parent)
 290                         return 0;
 291                 if (parent->type == EXPR_PREOP && parent->op == '&')
 292                         return 1;
 293                 if (parent->type == EXPR_PREOP && parent->op == '(')
 294                         goto next;
 295                 if (parent->type == EXPR_DEREF && parent->op == '.')
 296                         goto next;
 297
 298                 return 0;
 299 next:
 300                 expr = parent;
 301         } while (1);
 302 }
 303
 304 static int handle__builtin_choose_expr(struct expression *expr)
 305 {
 306         struct expression *const_expr, *expr1, *expr2;
 307         sval_t sval;
 308
 309         if (!sym_name_is("__builtin_choose_expr", expr->fn))
 310                 return 0;
 311
 312         const_expr = get_argument_from_call_expr(expr->args, 0);
 313         expr1 = get_argument_from_call_expr(expr->args, 1);
 314         expr2 = get_argument_from_call_expr(expr->args, 2);
 315
 316         if (!get_value(const_expr, &sval) || !expr1 || !expr2)
 317                 return 0;
 318         if (sval.value)
 319                 __split_expr(expr1);
 320         else
 321                 __split_expr(expr2);
 322         return 1;
 323 }
 324
 325 void __split_expr(struct expression *expr)
 326 {
 327         if (!expr)
 328                 return;
 329
 330         // sm_msg(" Debug expr_type %d %s", expr->type, show_special(expr->op));
 331
 332         if (__in_fake_assign && expr->type != EXPR_ASSIGNMENT)
 333                 return;
 334         if (__in_fake_assign >= 4)  /* don't allow too much nesting */
 335                 return;
 336
 337         push_expression(&big_expression_stack, expr);
 338         set_position(expr->pos);
 339         __pass_to_client(expr, EXPR_HOOK);
 340
 341         switch (expr->type) {
 342         case EXPR_PREOP:
 343                 expr_set_parent_expr(expr->unop, expr);
 344
 345                 if (expr->op == '*' &&
 346                     !prev_expression_is_getting_address(expr))
 347                         __pass_to_client(expr, DEREF_HOOK);
 348                 __split_expr(expr->unop);
 349                 __pass_to_client(expr, OP_HOOK);
 350                 break;
 351         case EXPR_POSTOP:
 352                 expr_set_parent_expr(expr->unop, expr);
 353
 354                 __split_expr(expr->unop);
 355                 push_expression(&post_op_stack, expr);
 356                 break;
 357         case EXPR_STATEMENT:
 358                 __expr_stmt_count++;
 359                 if (expr->statement && !expr->statement) {
 360                         stmt_set_parent_stmt(expr->statement,
 361                                         last_ptr_list((struct ptr_list *)big_statement_stack));
 362                 }
 363                 __split_stmt(expr->statement);
 364                 __expr_stmt_count--;
 365                 break;
 366         case EXPR_LOGICAL:
 367         case EXPR_COMPARE:
 368                 expr_set_parent_expr(expr->left, expr);
 369                 expr_set_parent_expr(expr->right, expr);
 370
 371                 __pass_to_client(expr, LOGIC_HOOK);
 372                 __handle_logic(expr);
 373                 break;
 374         case EXPR_BINOP:
 375                 expr_set_parent_expr(expr->left, expr);
 376                 expr_set_parent_expr(expr->right, expr);
 377
 378                 __pass_to_client(expr, BINOP_HOOK);
 379         case EXPR_COMMA:
 380                 expr_set_parent_expr(expr->left, expr);
 381                 expr_set_parent_expr(expr->right, expr);
 382
 383                 __split_expr(expr->left);
 384                 __process_post_op_stack();
 385                 __split_expr(expr->right);
 386                 break;
 387         case EXPR_ASSIGNMENT: {
 388                 struct expression *right;
 389
 390                 expr_set_parent_expr(expr->left, expr);
 391                 expr_set_parent_expr(expr->right, expr);
 392
 393                 right = strip_expr(expr->right);
 394                 if (!right)
 395                         break;
 396
 397                 __pass_to_client(expr, RAW_ASSIGNMENT_HOOK);
 398
 399                 /* foo = !bar() */
 400                 if (__handle_condition_assigns(expr))
 401                         break;
 402                 /* foo = (x < 5 ? foo : 5); */
 403                 if (__handle_select_assigns(expr))
 404                         break;
 405                 /* foo = ({frob(); frob(); frob(); 1;}) */
 406                 if (__handle_expr_statement_assigns(expr))
 407                         break;
 408                 /* foo = (3, 4); */
 409                 if (handle_comma_assigns(expr))
 410                         break;
 411                 if (handle_postop_assigns(expr))
 412                         break;
 413
 414                 __split_expr(expr->right);
 415                 if (outside_of_function())
 416                         __pass_to_client(expr, GLOBAL_ASSIGNMENT_HOOK);
 417                 else
 418                         __pass_to_client(expr, ASSIGNMENT_HOOK);
 419
 420                 __fake_struct_member_assignments(expr);
 421
 422                 if (expr->op == '=' && right->type == EXPR_CALL)
 423                         __pass_to_client(expr, CALL_ASSIGNMENT_HOOK);
 424
 425                 if (get_macro_name(right->pos) &&
 426                     get_macro_name(expr->pos) != get_macro_name(right->pos))
 427                         __pass_to_client(expr, MACRO_ASSIGNMENT_HOOK);
 428
 429                 __pass_to_client(expr, ASSIGNMENT_HOOK_AFTER);
 430
 431                 __split_expr(expr->left);
 432                 break;
 433         }
 434         case EXPR_DEREF:
 435                 expr_set_parent_expr(expr->deref, expr);
 436
 437                 __pass_to_client(expr, DEREF_HOOK);
 438                 __split_expr(expr->deref);
 439                 break;
 440         case EXPR_SLICE:
 441                 expr_set_parent_expr(expr->base, expr);
 442
 443                 __split_expr(expr->base);
 444                 break;
 445         case EXPR_CAST:
 446         case EXPR_FORCE_CAST:
 447                 expr_set_parent_expr(expr->cast_expression, expr);
 448
 449                 __pass_to_client(expr, CAST_HOOK);
 450                 __split_expr(expr->cast_expression);
 451                 break;
 452         case EXPR_SIZEOF:
 453                 if (expr->cast_expression)
 454                         __pass_to_client(strip_parens(expr->cast_expression),
 455                                          SIZEOF_HOOK);
 456                 break;
 457         case EXPR_OFFSETOF:
 458         case EXPR_ALIGNOF:
 459                 evaluate_expression(expr);
 460                 break;
 461         case EXPR_CONDITIONAL:
 462         case EXPR_SELECT:
 463                 expr_set_parent_expr(expr->conditional, expr);
 464                 expr_set_parent_expr(expr->cond_true, expr);
 465                 expr_set_parent_expr(expr->cond_false, expr);
 466
 467                 if (known_condition_true(expr->conditional)) {
 468                         __split_expr(expr->cond_true);
 469                         break;
 470                 }
 471                 if (known_condition_false(expr->conditional)) {
 472                         __split_expr(expr->cond_false);
 473                         break;
 474                 }
 475                 __pass_to_client(expr, SELECT_HOOK);
 476                 __split_whole_condition(expr->conditional);
 477                 __split_expr(expr->cond_true);
 478                 __push_true_states();
 479                 __use_false_states();
 480                 __split_expr(expr->cond_false);
 481                 __merge_true_states();
 482                 break;
 483         case EXPR_CALL:
 484                 expr_set_parent_expr(expr->fn, expr);
 485
 486                 if (sym_name_is("__builtin_constant_p", expr->fn))
 487                         break;
 488                 if (handle__builtin_choose_expr(expr))
 489                         break;
 490                 split_expr_list(expr->args, expr);
 491                 __split_expr(expr->fn);
 492                 if (is_inline_func(expr->fn))
 493                         add_inline_function(expr->fn->symbol);
 494                 if (inlinable(expr->fn))
 495                         __inline_call = 1;
 496                 __process_post_op_stack();
 497                 __pass_to_client(expr, FUNCTION_CALL_HOOK_BEFORE);
 498                 __pass_to_client(expr, FUNCTION_CALL_HOOK);
 499                 __inline_call = 0;
 500                 if (inlinable(expr->fn)) {
 501                         parse_inline(expr);
 502                 }
 503                 __pass_to_client(expr, CALL_HOOK_AFTER_INLINE);
 504                 if (is_noreturn_func(expr->fn))
 505                         nullify_path();
 506                 break;
 507         case EXPR_INITIALIZER:
 508                 split_expr_list(expr->expr_list, expr);
 509                 break;
 510         case EXPR_IDENTIFIER:
 511                 expr_set_parent_expr(expr->ident_expression, expr);
 512                 __split_expr(expr->ident_expression);
 513                 break;
 514         case EXPR_INDEX:
 515                 expr_set_parent_expr(expr->idx_expression, expr);
 516                 __split_expr(expr->idx_expression);
 517                 break;
 518         case EXPR_POS:
 519                 expr_set_parent_expr(expr->init_expr, expr);
 520                 __split_expr(expr->init_expr);
 521                 break;
 522         case EXPR_SYMBOL:
 523                 __pass_to_client(expr, SYM_HOOK);
 524                 break;
 525         case EXPR_STRING:
 526                 __pass_to_client(expr, STRING_HOOK);
 527                 break;
 528         default:
 529                 break;
 530         };
 531         pop_expression(&big_expression_stack);
 532 }
 533
 534 static int is_forever_loop(struct statement *stmt)
 535 {
 536         struct expression *expr;
 537         sval_t sval;
 538
 539         expr = strip_expr(stmt->iterator_pre_condition);
 540         if (!expr)
 541                 expr = stmt->iterator_post_condition;
 542         if (!expr) {
 543                 /* this is a for(;;) loop... */
 544                 return 1;
 545         }
 546
 547         if (get_value(expr, &sval) && sval.value != 0)
 548                 return 1;
 549
 550         return 0;
 551 }
 552
 553 static int loop_num;
 554 static char *get_loop_name(int num)
 555 {
 556         char buf[256];
 557
 558         snprintf(buf, 255, "-loop%d", num);
 559         buf[255] = '\0';
 560         return alloc_sname(buf);
 561 }
 562
 563 /*
 564  * Pre Loops are while and for loops.
 565  */
 566 static void handle_pre_loop(struct statement *stmt)
 567 {
 568         int once_through; /* we go through the loop at least once */
 569         struct sm_state *extra_sm = NULL;
 570         int unchanged = 0;
 571         char *loop_name;
 572         struct stree *stree = NULL;
 573         struct sm_state *sm = NULL;
 574
 575         loop_name = get_loop_name(loop_num);
 576         loop_num++;
 577
 578         __split_stmt(stmt->iterator_pre_statement);
 579         __prev_stmt = stmt->iterator_pre_statement;
 580
 581         once_through = implied_condition_true(stmt->iterator_pre_condition);
 582
 583         loop_count++;
 584         __push_continues();
 585         __push_breaks();
 586
 587         __merge_gotos(loop_name, NULL);
 588
 589         extra_sm = __extra_handle_canonical_loops(stmt, &stree);
 590         __in_pre_condition++;
 591         __pass_to_client(stmt, PRELOOP_HOOK);
 592         __split_whole_condition(stmt->iterator_pre_condition);
 593         __in_pre_condition--;
 594         FOR_EACH_SM(stree, sm) {
 595                 set_state(sm->owner, sm->name, sm->sym, sm->state);
 596         } END_FOR_EACH_SM(sm);
 597         free_stree(&stree);
 598         if (extra_sm)
 599                 extra_sm = get_sm_state(extra_sm->owner, extra_sm->name, extra_sm->sym);
 600
 601         if (option_assume_loops)
 602                 once_through = 1;
 603
 604         __split_stmt(stmt->iterator_statement);
 605         if (is_forever_loop(stmt)) {
 606                 __merge_continues();
 607                 __save_gotos(loop_name, NULL);
 608
 609                 __push_fake_cur_stree();
 610                 __split_stmt(stmt->iterator_post_statement);
 611                 stree = __pop_fake_cur_stree();
 612
 613                 __discard_false_states();
 614                 __use_breaks();
 615
 616                 if (!__path_is_null())
 617                         __merge_stree_into_cur(stree);
 618                 free_stree(&stree);
 619         } else {
 620                 __merge_continues();
 621                 unchanged = __iterator_unchanged(extra_sm);
 622                 __split_stmt(stmt->iterator_post_statement);
 623                 __prev_stmt = stmt->iterator_post_statement;
 624                 __cur_stmt = stmt;
 625
 626                 __save_gotos(loop_name, NULL);
 627                 __in_pre_condition++;
 628                 __split_whole_condition(stmt->iterator_pre_condition);
 629                 __in_pre_condition--;
 630                 nullify_path();
 631                 __merge_false_states();
 632                 if (once_through)
 633                         __discard_false_states();
 634                 else
 635                         __merge_false_states();
 636
 637                 if (extra_sm && unchanged)
 638                         __extra_pre_loop_hook_after(extra_sm,
 639                                                 stmt->iterator_post_statement,
 640                                                 stmt->iterator_pre_condition);
 641                 __merge_breaks();
 642         }
 643         loop_count--;
 644 }
 645
 646 /*
 647  * Post loops are do {} while();
 648  */
 649 static void handle_post_loop(struct statement *stmt)
 650 {
 651         char *loop_name;
 652
 653         loop_name = get_loop_name(loop_num);
 654         loop_num++;
 655         loop_count++;
 656
 657         __push_continues();
 658         __push_breaks();
 659         __merge_gotos(loop_name, NULL);
 660         __split_stmt(stmt->iterator_statement);
 661         __merge_continues();
 662         if (!is_zero(stmt->iterator_post_condition))
 663                 __save_gotos(loop_name, NULL);
 664
 665         if (is_forever_loop(stmt)) {
 666                 __use_breaks();
 667         } else {
 668                 __split_whole_condition(stmt->iterator_post_condition);
 669                 __use_false_states();
 670                 __merge_breaks();
 671         }
 672         loop_count--;
 673 }
 674
 675 static int empty_statement(struct statement *stmt)
 676 {
 677         if (!stmt)
 678                 return 0;
 679         if (stmt->type == STMT_EXPRESSION && !stmt->expression)
 680                 return 1;
 681         return 0;
 682 }
 683
 684 static int last_stmt_on_same_line(void)
 685 {
 686         struct statement *stmt;
 687         int i = 0;
 688
 689         FOR_EACH_PTR_REVERSE(big_statement_stack, stmt) {
 690                 if (!i++)
 691                         continue;
 692                 if  (stmt->pos.line == get_lineno())
 693                         return 1;
 694                 return 0;
 695         } END_FOR_EACH_PTR_REVERSE(stmt);
 696         return 0;
 697 }
 698
 699 static void split_asm_constraints(struct expression_list *expr_list)
 700 {
 701         struct expression *expr;
 702         int state = 0;
 703
 704         FOR_EACH_PTR(expr_list, expr) {
 705                 switch (state) {
 706                 case 0: /* identifier */
 707                 case 1: /* constraint */
 708                         state++;
 709                         continue;
 710                 case 2: /* expression */
 711                         state = 0;
 712                         __split_expr(expr);
 713                         continue;
 714                 }
 715         } END_FOR_EACH_PTR(expr);
 716 }
 717
 718 static int is_case_val(struct statement *stmt, sval_t sval)
 719 {
 720         sval_t case_sval;
 721
 722         if (stmt->type != STMT_CASE)
 723                 return 0;
 724         if (!stmt->case_expression) {
 725                 __set_default();
 726                 return 1;
 727         }
 728         if (!get_value(stmt->case_expression, &case_sval))
 729                 return 0;
 730         if (case_sval.value == sval.value)
 731                 return 1;
 732         return 0;
 733 }
 734
 735 static struct range_list *get_case_rl(struct expression *switch_expr,
 736                                       struct expression *case_expr,
 737                                       struct expression *case_to)
 738 {
 739         sval_t start, end;
 740         struct range_list *rl = NULL;
 741         struct symbol *switch_type;
 742
 743         switch_type = get_type(switch_expr);
 744         if (get_value(case_to, &end) && get_value(case_expr, &start)) {
 745                 start = sval_cast(switch_type, start);
 746                 end = sval_cast(switch_type, end);
 747                 add_range(&rl, start, end);
 748         } else if (get_value(case_expr, &start)) {
 749                 start = sval_cast(switch_type, start);
 750                 add_range(&rl, start, start);
 751         }
 752
 753         return rl;
 754 }
 755
 756 static void split_known_switch(struct statement *stmt, sval_t sval)
 757 {
 758         struct statement *tmp;
 759         struct range_list *rl;
 760
 761         __split_expr(stmt->switch_expression);
 762         sval = sval_cast(get_type(stmt->switch_expression), sval);
 763
 764         push_expression(&switch_expr_stack, stmt->switch_expression);
 765         __save_switch_states(top_expression(switch_expr_stack));
 766         nullify_path();
 767         __push_default();
 768         __push_breaks();
 769
 770         stmt = stmt->switch_statement;
 771
 772         __push_scope_hooks();
 773         FOR_EACH_PTR(stmt->stmts, tmp) {
 774                 __smatch_lineno = tmp->pos.line;
 775                 if (is_case_val(tmp, sval)) {
 776                         rl = alloc_rl(sval, sval);
 777                         __merge_switches(top_expression(switch_expr_stack), rl);
 778                         __pass_case_to_client(top_expression(switch_expr_stack), rl);
 779                 }
 780                 if (__path_is_null())
 781                         continue;
 782                 __split_stmt(tmp);
 783                 if (__path_is_null()) {
 784                         __set_default();
 785                         goto out;
 786                 }
 787         } END_FOR_EACH_PTR(tmp);
 788 out:
 789         __call_scope_hooks();
 790         if (!__pop_default())
 791                 __merge_switches(top_expression(switch_expr_stack), NULL);
 792         __discard_switches();
 793         __merge_breaks();
 794         pop_expression(&switch_expr_stack);
 795 }
 796
 797 static void split_case(struct statement *stmt)
 798 {
 799         struct range_list *rl = NULL;
 800
 801         expr_set_parent_stmt(stmt->case_expression, stmt);
 802         expr_set_parent_stmt(stmt->case_to, stmt);
 803
 804         rl = get_case_rl(top_expression(switch_expr_stack),
 805                          stmt->case_expression, stmt->case_to);
 806         while (stmt->case_statement->type == STMT_CASE) {
 807                 struct range_list *tmp;
 808
 809                 tmp = get_case_rl(top_expression(switch_expr_stack),
 810                                   stmt->case_statement->case_expression,
 811                                   stmt->case_statement->case_to);
 812                 if (!tmp)
 813                         break;
 814                 rl = rl_union(rl, tmp);
 815                 if (!stmt->case_expression)
 816                         __set_default();
 817                 stmt = stmt->case_statement;
 818         }
 819
 820         __merge_switches(top_expression(switch_expr_stack), rl);
 821
 822         if (!stmt->case_expression)
 823                 __set_default();
 824         __split_stmt(stmt->case_statement);
 825 }
 826
 827 int time_parsing_function(void)
 828 {
 829         return ms_since(&fn_start_time) / 1000;
 830 }
 831
 832 static int taking_too_long(void)
 833 {
 834         if (time_parsing_function() > 60 * 5)  /* five minutes */
 835                 return 1;
 836         return 0;
 837 }
 838
 839 static int is_last_stmt(struct statement *cur_stmt)
 840 {
 841         struct symbol *fn = get_base_type(cur_func_sym);
 842         struct statement *stmt;
 843
 844         if (!fn)
 845                 return 0;
 846         stmt = fn->stmt;
 847         if (!stmt)
 848                 stmt = fn->inline_stmt;
 849         if (!stmt || stmt->type != STMT_COMPOUND)
 850                 return 0;
 851         stmt = last_ptr_list((struct ptr_list *)stmt->stmts);
 852         if (stmt && stmt->type == STMT_LABEL)
 853                 stmt = stmt->label_statement;
 854         if (stmt == cur_stmt)
 855                 return 1;
 856         return 0;
 857 }
 858
 859 static void handle_backward_goto(struct statement *goto_stmt)
 860 {
 861         const char *goto_name, *label_name;
 862         struct statement *func_stmt;
 863         struct symbol *base_type = get_base_type(cur_func_sym);
 864         struct statement *tmp;
 865         int found = 0;
 866
 867         if (!option_info)
 868                 return;
 869         if (last_goto_statement_handled)
 870                 return;
 871         last_goto_statement_handled = 1;
 872
 873         if (!goto_stmt->goto_label ||
 874             goto_stmt->goto_label->type != SYM_LABEL ||
 875             !goto_stmt->goto_label->ident)
 876                 return;
 877         goto_name = goto_stmt->goto_label->ident->name;
 878
 879         func_stmt = base_type->stmt;
 880         if (!func_stmt)
 881                 func_stmt = base_type->inline_stmt;
 882         if (!func_stmt)
 883                 return;
 884         if (func_stmt->type != STMT_COMPOUND)
 885                 return;
 886
 887         FOR_EACH_PTR(func_stmt->stmts, tmp) {
 888                 if (!found) {
 889                         if (tmp->type != STMT_LABEL)
 890                                 continue;
 891                         if (!tmp->label_identifier ||
 892                             tmp->label_identifier->type != SYM_LABEL ||
 893                             !tmp->label_identifier->ident)
 894                                 continue;
 895                         label_name = tmp->label_identifier->ident->name;
 896                         if (strcmp(goto_name, label_name) != 0)
 897                                 continue;
 898                         found = 1;
 899                 }
 900                 __split_stmt(tmp);
 901         } END_FOR_EACH_PTR(tmp);
 902 }
 903
 904 static void fake_a_return(void)
 905 {
 906         struct symbol *return_type;
 907
 908         nullify_path();
 909         __unnullify_path();
 910
 911         return_type = get_real_base_type(cur_func_sym);
 912         return_type = get_real_base_type(return_type);
 913         if (return_type != &void_ctype) {
 914                 __pass_to_client(unknown_value_expression(NULL), RETURN_HOOK);
 915                 nullify_path();
 916         }
 917 }
 918
 919 static void fake_an_empty_default(struct position pos)
 920 {
 921         static struct statement none = {};
 922
 923         none.pos = pos;
 924         none.type = STMT_NONE;
 925         __merge_switches(top_expression(switch_expr_stack), NULL);
 926         __split_stmt(&none);
 927 }
 928
 929 static void split_compound(struct statement *stmt)
 930 {
 931         struct statement *prev = NULL;
 932         struct statement *cur = NULL;
 933         struct statement *next;
 934
 935         __push_scope_hooks();
 936
 937         FOR_EACH_PTR(stmt->stmts, next) {
 938                 /* just set them all ahead of time */
 939                 stmt_set_parent_stmt(next, stmt);
 940
 941                 if (cur) {
 942                         __prev_stmt = prev;
 943                         __next_stmt = next;
 944                         __cur_stmt = cur;
 945                         __split_stmt(cur);
 946                 }
 947                 prev = cur;
 948                 cur = next;
 949         } END_FOR_EACH_PTR(next);
 950         if (cur) {
 951                 __prev_stmt = prev;
 952                 __cur_stmt = cur;
 953                 __next_stmt = NULL;
 954                 __split_stmt(cur);
 955         }
 956
 957         /*
 958          * For function scope, then delay calling the scope hooks until the
 959          * end of function hooks can run.  I'm not positive this is the right
 960          * thing...
 961          */
 962         if (!is_last_stmt(cur))
 963                 __call_scope_hooks();
 964 }
 965
 966 /*
 967  * This is a hack, work around for detecting empty functions.
 968  */
 969 static int need_delayed_scope_hooks(void)
 970 {
 971         struct symbol *fn = get_base_type(cur_func_sym);
 972         struct statement *stmt;
 973
 974         if (!fn)
 975                 return 0;
 976         stmt = fn->stmt;
 977         if (!stmt)
 978                 stmt = fn->inline_stmt;
 979         if (stmt && stmt->type == STMT_COMPOUND)
 980                 return 1;
 981         return 0;
 982 }
 983
 984 void __split_label_stmt(struct statement *stmt)
 985 {
 986         if (stmt->label_identifier &&
 987             stmt->label_identifier->type == SYM_LABEL &&
 988             stmt->label_identifier->ident) {
 989                 loop_count |= 0x0800000;
 990                 __merge_gotos(stmt->label_identifier->ident->name, stmt->label_identifier);
 991         }
 992 }
 993
 994 static void find_asm_gotos(struct statement *stmt)
 995 {
 996         struct symbol *sym;
 997
 998         FOR_EACH_PTR(stmt->asm_labels, sym) {
 999                 __save_gotos(sym->ident->name, sym);
1000         } END_FOR_EACH_PTR(sym);
1001 }
1002
1003 void __split_stmt(struct statement *stmt)
1004 {
1005         sval_t sval;
1006
1007         if (!stmt)
1008                 goto out;
1009
1010         if (!__in_fake_assign)
1011                 __silence_warnings_for_stmt = false;
1012
1013         if (__bail_on_rest_of_function)
1014                 return;
1015
1016         if (out_of_memory() || taking_too_long()) {
1017                 struct timeval stop;
1018
1019                 gettimeofday(&stop, NULL);
1020
1021                 __bail_on_rest_of_function = 1;
1022                 final_pass = 1;
1023                 sm_msg("Function too hairy.  Giving up. %lu seconds",
1024                        stop.tv_sec - fn_start_time.tv_sec);
1025                 fake_a_return();
1026                 final_pass = 0;  /* turn off sm_msg() from here */
1027                 return;
1028         }
1029
1030         add_ptr_list(&big_statement_stack, stmt);
1031         free_expression_stack(&big_expression_stack);
1032         set_position(stmt->pos);
1033         __pass_to_client(stmt, STMT_HOOK);
1034
1035         switch (stmt->type) {
1036         case STMT_DECLARATION:
1037                 split_declaration(stmt->declaration);
1038                 break;
1039         case STMT_RETURN:
1040                 expr_set_parent_stmt(stmt->ret_value, stmt);
1041
1042                 __split_expr(stmt->ret_value);
1043                 __pass_to_client(stmt->ret_value, RETURN_HOOK);
1044                 __process_post_op_stack();
1045                 nullify_path();
1046                 break;
1047         case STMT_EXPRESSION:
1048                 expr_set_parent_stmt(stmt->expression, stmt);
1049                 expr_set_parent_stmt(stmt->context, stmt);
1050
1051                 __split_expr(stmt->expression);
1052                 break;
1053         case STMT_COMPOUND:
1054                 split_compound(stmt);
1055                 break;
1056         case STMT_IF:
1057                 stmt_set_parent_stmt(stmt->if_true, stmt);
1058                 stmt_set_parent_stmt(stmt->if_false, stmt);
1059                 expr_set_parent_stmt(stmt->if_conditional, stmt);
1060
1061                 if (known_condition_true(stmt->if_conditional)) {
1062                         __split_stmt(stmt->if_true);
1063                         break;
1064                 }
1065                 if (known_condition_false(stmt->if_conditional)) {
1066                         __split_stmt(stmt->if_false);
1067                         break;
1068                 }
1069                 __split_whole_condition(stmt->if_conditional);
1070                 __split_stmt(stmt->if_true);
1071                 if (empty_statement(stmt->if_true) &&
1072                         last_stmt_on_same_line() &&
1073                         !get_macro_name(stmt->if_true->pos))
1074                         sm_msg("warn: if();");
1075                 __push_true_states();
1076                 __use_false_states();
1077                 __split_stmt(stmt->if_false);
1078                 __merge_true_states();
1079                 break;
1080         case STMT_ITERATOR:
1081                 stmt_set_parent_stmt(stmt->iterator_pre_statement, stmt);
1082                 stmt_set_parent_stmt(stmt->iterator_statement, stmt);
1083                 stmt_set_parent_stmt(stmt->iterator_post_statement, stmt);
1084                 expr_set_parent_stmt(stmt->iterator_pre_condition, stmt);
1085                 expr_set_parent_stmt(stmt->iterator_post_condition, stmt);
1086
1087                 if (stmt->iterator_pre_condition)
1088                         handle_pre_loop(stmt);
1089                 else if (stmt->iterator_post_condition)
1090                         handle_post_loop(stmt);
1091                 else {
1092                         // these are for(;;) type loops.
1093                         handle_pre_loop(stmt);
1094                 }
1095                 break;
1096         case STMT_SWITCH:
1097                 stmt_set_parent_stmt(stmt->switch_statement, stmt);
1098                 expr_set_parent_stmt(stmt->switch_expression, stmt);
1099
1100                 if (get_value(stmt->switch_expression, &sval)) {
1101                         split_known_switch(stmt, sval);
1102                         break;
1103                 }
1104                 __split_expr(stmt->switch_expression);
1105                 push_expression(&switch_expr_stack, stmt->switch_expression);
1106                 __save_switch_states(top_expression(switch_expr_stack));
1107                 nullify_path();
1108                 __push_default();
1109                 __push_breaks();
1110                 __split_stmt(stmt->switch_statement);
1111                 if (!__pop_default() && have_remaining_cases())
1112                         fake_an_empty_default(stmt->pos);
1113                 __discard_switches();
1114                 __merge_breaks();
1115                 pop_expression(&switch_expr_stack);
1116                 break;
1117         case STMT_CASE:
1118                 split_case(stmt);
1119                 break;
1120         case STMT_LABEL:
1121                 __split_label_stmt(stmt);
1122                 __split_stmt(stmt->label_statement);
1123                 break;
1124         case STMT_GOTO:
1125                 expr_set_parent_stmt(stmt->goto_expression, stmt);
1126
1127                 __split_expr(stmt->goto_expression);
1128                 if (stmt->goto_label && stmt->goto_label->type == SYM_NODE) {
1129                         if (!strcmp(stmt->goto_label->ident->name, "break")) {
1130                                 __process_breaks();
1131                         } else if (!strcmp(stmt->goto_label->ident->name,
1132                                            "continue")) {
1133                                 __process_continues();
1134                         }
1135                 } else if (stmt->goto_label &&
1136                            stmt->goto_label->type == SYM_LABEL &&
1137                            stmt->goto_label->ident) {
1138                         __save_gotos(stmt->goto_label->ident->name, stmt->goto_label);
1139                 }
1140                 nullify_path();
1141                 if (is_last_stmt(stmt))
1142                         handle_backward_goto(stmt);
1143                 break;
1144         case STMT_NONE:
1145                 break;
1146         case STMT_ASM:
1147                 expr_set_parent_stmt(stmt->asm_string, stmt);
1148
1149                 find_asm_gotos(stmt);
1150                 __pass_to_client(stmt, ASM_HOOK);
1151                 __split_expr(stmt->asm_string);
1152                 split_asm_constraints(stmt->asm_outputs);
1153                 split_asm_constraints(stmt->asm_inputs);
1154                 split_asm_constraints(stmt->asm_clobbers);
1155                 break;
1156         case STMT_CONTEXT:
1157                 break;
1158         case STMT_RANGE:
1159                 __split_expr(stmt->range_expression);
1160                 __split_expr(stmt->range_low);
1161                 __split_expr(stmt->range_high);
1162                 break;
1163         }
1164         __pass_to_client(stmt, STMT_HOOK_AFTER);
1165 out:
1166         __process_post_op_stack();
1167 }
1168
1169 static void split_expr_list(struct expression_list *expr_list, struct expression *parent)
1170 {
1171         struct expression *expr;
1172
1173         FOR_EACH_PTR(expr_list, expr) {
1174                 expr_set_parent_expr(expr, parent);
1175                 __split_expr(expr);
1176                 __process_post_op_stack();
1177         } END_FOR_EACH_PTR(expr);
1178 }
1179
1180 static void split_sym(struct symbol *sym)
1181 {
1182         if (!sym)
1183                 return;
1184         if (!(sym->namespace & NS_SYMBOL))
1185                 return;
1186
1187         __split_stmt(sym->stmt);
1188         __split_expr(sym->array_size);
1189         split_symlist(sym->arguments);
1190         split_symlist(sym->symbol_list);
1191         __split_stmt(sym->inline_stmt);
1192         split_symlist(sym->inline_symbol_list);
1193 }
1194
1195 static void split_symlist(struct symbol_list *sym_list)
1196 {
1197         struct symbol *sym;
1198
1199         FOR_EACH_PTR(sym_list, sym) {
1200                 split_sym(sym);
1201         } END_FOR_EACH_PTR(sym);
1202 }
1203
1204 typedef void (fake_cb)(struct expression *expr);
1205
1206 static int member_to_number(struct expression *expr, struct ident *member)
1207 {
1208         struct symbol *type, *tmp;
1209         char *name;
1210         int i;
1211
1212         if (!member)
1213                 return -1;
1214         name = member->name;
1215
1216         type = get_type(expr);
1217         if (!type || type->type != SYM_STRUCT)
1218                 return -1;
1219
1220         i = -1;
1221         FOR_EACH_PTR(type->symbol_list, tmp) {
1222                 i++;
1223                 if (!tmp->ident)
1224                         continue;
1225                 if (strcmp(name, tmp->ident->name) == 0)
1226                         return i;
1227         } END_FOR_EACH_PTR(tmp);
1228         return -1;
1229 }
1230
1231 static struct ident *number_to_member(struct expression *expr, int num)
1232 {
1233         struct symbol *type, *member;
1234         int i = 0;
1235
1236         type = get_type(expr);
1237         if (!type || type->type != SYM_STRUCT)
1238                 return NULL;
1239
1240         FOR_EACH_PTR(type->symbol_list, member) {
1241                 if (i == num)
1242                         return member->ident;
1243                 i++;
1244         } END_FOR_EACH_PTR(member);
1245         return NULL;
1246 }
1247
1248 static void fake_element_assigns_helper(struct expression *array, struct expression_list *expr_list, fake_cb *fake_cb);
1249
1250 static void set_inner_struct_members(struct expression *expr, struct symbol *member)
1251 {
1252         struct expression *edge_member, *assign;
1253         struct symbol *base = get_real_base_type(member);
1254         struct symbol *tmp;
1255
1256         if (member->ident)
1257                 expr = member_expression(expr, '.', member->ident);
1258
1259         FOR_EACH_PTR(base->symbol_list, tmp) {
1260                 struct symbol *type;
1261
1262                 type = get_real_base_type(tmp);
1263                 if (!type)
1264                         continue;
1265
1266                 edge_member = member_expression(expr, '.', tmp->ident);
1267                 if (get_extra_state(edge_member))
1268                         continue;
1269
1270                 if (type->type == SYM_UNION || type->type == SYM_STRUCT) {
1271                         set_inner_struct_members(expr, tmp);
1272                         continue;
1273                 }
1274
1275                 if (!tmp->ident)
1276                         continue;
1277
1278                 assign = assign_expression(edge_member, '=', zero_expr());
1279                 __split_expr(assign);
1280         } END_FOR_EACH_PTR(tmp);
1281
1282
1283 }
1284
1285 static void set_unset_to_zero(struct symbol *type, struct expression *expr)
1286 {
1287         struct symbol *tmp;
1288         struct expression *member = NULL;
1289         struct expression *assign;
1290         int op = '*';
1291
1292         if (expr->type == EXPR_PREOP && expr->op == '&') {
1293                 expr = strip_expr(expr->unop);
1294                 op = '.';
1295         }
1296
1297         FOR_EACH_PTR(type->symbol_list, tmp) {
1298                 type = get_real_base_type(tmp);
1299                 if (!type)
1300                         continue;
1301
1302                 if (tmp->ident) {
1303                         member = member_expression(expr, op, tmp->ident);
1304                         if (get_extra_state(member))
1305                                 continue;
1306                 }
1307
1308                 if (type->type == SYM_UNION || type->type == SYM_STRUCT) {
1309                         set_inner_struct_members(expr, tmp);
1310                         continue;
1311                 }
1312                 if (type->type == SYM_ARRAY)
1313                         continue;
1314                 if (!tmp->ident)
1315                         continue;
1316
1317                 assign = assign_expression(member, '=', zero_expr());
1318                 __split_expr(assign);
1319         } END_FOR_EACH_PTR(tmp);
1320 }
1321
1322 static void fake_member_assigns_helper(struct expression *symbol, struct expression_list *members, fake_cb *fake_cb)
1323 {
1324         struct expression *deref, *assign, *tmp, *right;
1325         struct symbol *struct_type, *type;
1326         struct ident *member;
1327         int member_idx;
1328
1329         struct_type = get_type(symbol);
1330         if (!struct_type ||
1331             (struct_type->type != SYM_STRUCT && struct_type->type != SYM_UNION))
1332                 return;
1333
1334         /*
1335          * We're parsing an initializer that could look something like this:
1336          * struct foo foo = {
1337          *      42,
1338          *      .whatever.xxx = 11,
1339          *      .zzz = 12,
1340          * };
1341          *
1342          * So what we have here is a list with 42, .whatever, and .zzz.  We need
1343          * to break it up into left and right sides of the assignments.
1344          *
1345          */
1346         member_idx = 0;
1347         FOR_EACH_PTR(members, tmp) {
1348                 deref = NULL;
1349                 if (tmp->type == EXPR_IDENTIFIER) {
1350                         member_idx = member_to_number(symbol, tmp->expr_ident);
1351                         while (tmp->type == EXPR_IDENTIFIER) {
1352                                 member = tmp->expr_ident;
1353                                 tmp = tmp->ident_expression;
1354                                 if (deref)
1355                                         deref = member_expression(deref, '.', member);
1356                                 else
1357                                         deref = member_expression(symbol, '.', member);
1358                         }
1359                 } else {
1360                         member = number_to_member(symbol, member_idx);
1361                         deref = member_expression(symbol, '.', member);
1362                 }
1363                 right = tmp;
1364                 member_idx++;
1365                 if (right->type == EXPR_INITIALIZER) {
1366                         type = get_type(deref);
1367                         if (type && type->type == SYM_ARRAY)
1368                                 fake_element_assigns_helper(deref, right->expr_list, fake_cb);
1369                         else
1370                                 fake_member_assigns_helper(deref, right->expr_list, fake_cb);
1371                 } else {
1372                         assign = assign_expression(deref, '=', right);
1373                         fake_cb(assign);
1374                 }
1375         } END_FOR_EACH_PTR(tmp);
1376
1377         set_unset_to_zero(struct_type, symbol);
1378 }
1379
1380 static void fake_member_assigns(struct symbol *sym, fake_cb *fake_cb)
1381 {
1382         fake_member_assigns_helper(symbol_expression(sym),
1383                                    sym->initializer->expr_list, fake_cb);
1384 }
1385
1386 static void fake_element_assigns_helper(struct expression *array, struct expression_list *expr_list, fake_cb *fake_cb)
1387 {
1388         struct expression *offset, *binop, *assign, *tmp;
1389         struct symbol *type;
1390         int idx;
1391
1392         if (ptr_list_size((struct ptr_list *)expr_list) > 1000)
1393                 return;
1394
1395         idx = 0;
1396         FOR_EACH_PTR(expr_list, tmp) {
1397                 if (tmp->type == EXPR_INDEX) {
1398                         if (tmp->idx_from != tmp->idx_to)
1399                                 return;
1400                         idx = tmp->idx_from;
1401                         if (!tmp->idx_expression)
1402                                 goto next;
1403                         tmp = tmp->idx_expression;
1404                 }
1405                 offset = value_expr(idx);
1406                 binop = array_element_expression(array, offset);
1407                 if (tmp->type == EXPR_INITIALIZER) {
1408                         type = get_type(binop);
1409                         if (type && type->type == SYM_ARRAY)
1410                                 fake_element_assigns_helper(binop, tmp->expr_list, fake_cb);
1411                         else
1412                                 fake_member_assigns_helper(binop, tmp->expr_list, fake_cb);
1413                 } else {
1414                         assign = assign_expression(binop, '=', tmp);
1415                         fake_cb(assign);
1416                 }
1417 next:
1418                 idx++;
1419         } END_FOR_EACH_PTR(tmp);
1420 }
1421
1422 static void fake_element_assigns(struct symbol *sym, fake_cb *fake_cb)
1423 {
1424         fake_element_assigns_helper(symbol_expression(sym), sym->initializer->expr_list, fake_cb);
1425 }
1426
1427 static void fake_assign_expr(struct symbol *sym)
1428 {
1429         struct expression *assign, *symbol;
1430
1431         symbol = symbol_expression(sym);
1432         assign = assign_expression(symbol, '=', sym->initializer);
1433         __split_expr(assign);
1434 }
1435
1436 static void do_initializer_stuff(struct symbol *sym)
1437 {
1438         if (!sym->initializer)
1439                 return;
1440
1441         if (sym->initializer->type == EXPR_INITIALIZER) {
1442                 if (get_real_base_type(sym)->type == SYM_ARRAY)
1443                         fake_element_assigns(sym, __split_expr);
1444                 else
1445                         fake_member_assigns(sym, __split_expr);
1446         } else {
1447                 fake_assign_expr(sym);
1448         }
1449 }
1450
1451 static void split_declaration(struct symbol_list *sym_list)
1452 {
1453         struct symbol *sym;
1454
1455         FOR_EACH_PTR(sym_list, sym) {
1456                 __pass_to_client(sym, DECLARATION_HOOK);
1457                 do_initializer_stuff(sym);
1458                 split_sym(sym);
1459         } END_FOR_EACH_PTR(sym);
1460 }
1461
1462 static void call_global_assign_hooks(struct expression *assign)
1463 {
1464         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1465 }
1466
1467 static void fake_global_assign(struct symbol *sym)
1468 {
1469         struct expression *assign, *symbol;
1470
1471         if (get_real_base_type(sym)->type == SYM_ARRAY) {
1472                 if (sym->initializer && sym->initializer->type == EXPR_INITIALIZER) {
1473                         fake_element_assigns(sym, call_global_assign_hooks);
1474                 } else if (sym->initializer) {
1475                         symbol = symbol_expression(sym);
1476                         assign = assign_expression(symbol, '=', sym->initializer);
1477                         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1478                 } else {
1479                         fake_element_assigns_helper(symbol_expression(sym), NULL, call_global_assign_hooks);
1480                 }
1481         } else if (get_real_base_type(sym)->type == SYM_STRUCT) {
1482                 if (sym->initializer && sym->initializer->type == EXPR_INITIALIZER) {
1483                         fake_member_assigns(sym, call_global_assign_hooks);
1484                 } else if (sym->initializer) {
1485                         symbol = symbol_expression(sym);
1486                         assign = assign_expression(symbol, '=', sym->initializer);
1487                         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1488                 } else {
1489                         fake_member_assigns_helper(symbol_expression(sym), NULL, call_global_assign_hooks);
1490                 }
1491         } else {
1492                 symbol = symbol_expression(sym);
1493                 if (sym->initializer)
1494                         assign = assign_expression(symbol, '=', sym->initializer);
1495                 else
1496                         assign = assign_expression(symbol, '=', zero_expr());
1497                 __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1498         }
1499 }
1500
1501 static void start_function_definition(struct symbol *sym)
1502 {
1503         __in_function_def = 1;
1504         __pass_to_client(sym, FUNC_DEF_HOOK);
1505         __in_function_def = 0;
1506         __pass_to_client(sym, AFTER_DEF_HOOK);
1507
1508 }
1509
1510 static void split_function(struct symbol *sym)
1511 {
1512         struct symbol *base_type = get_base_type(sym);
1513         struct timeval stop;
1514
1515         if (!base_type->stmt && !base_type->inline_stmt)
1516                 return;
1517
1518         gettimeofday(&fn_start_time, NULL);
1519         cur_func_sym = sym;
1520         if (sym->ident)
1521                 cur_func = sym->ident->name;
1522         set_position(sym->pos);
1523         loop_count = 0;
1524         last_goto_statement_handled = 0;
1525         sm_debug("new function:  %s\n", cur_func);
1526         __stree_id = 0;
1527         if (option_two_passes) {
1528                 __unnullify_path();
1529                 loop_num = 0;
1530                 final_pass = 0;
1531                 start_function_definition(sym);
1532                 __split_stmt(base_type->stmt);
1533                 __split_stmt(base_type->inline_stmt);
1534                 nullify_path();
1535         }
1536         __unnullify_path();
1537         loop_num = 0;
1538         final_pass = 1;
1539         start_function_definition(sym);
1540         __split_stmt(base_type->stmt);
1541         __split_stmt(base_type->inline_stmt);
1542         __pass_to_client(sym, END_FUNC_HOOK);
1543         if (need_delayed_scope_hooks())
1544                 __call_scope_hooks();
1545         __pass_to_client(sym, AFTER_FUNC_HOOK);
1546
1547         clear_all_states();
1548
1549         gettimeofday(&stop, NULL);
1550         if (option_time && stop.tv_sec - fn_start_time.tv_sec > 2) {
1551                 final_pass++;
1552                 sm_msg("func_time: %lu", stop.tv_sec - fn_start_time.tv_sec);
1553                 final_pass--;
1554         }
1555         cur_func_sym = NULL;
1556         cur_func = NULL;
1557         free_data_info_allocs();
1558         free_expression_stack(&switch_expr_stack);
1559         __free_ptr_list((struct ptr_list **)&big_statement_stack);
1560         __bail_on_rest_of_function = 0;
1561 }
1562
1563 static void save_flow_state(void)
1564 {
1565         __add_ptr_list(&backup, INT_PTR(loop_num << 2), 0);
1566         __add_ptr_list(&backup, INT_PTR(loop_count << 2), 0);
1567         __add_ptr_list(&backup, INT_PTR(final_pass << 2), 0);
1568
1569         __add_ptr_list(&backup, big_statement_stack, 0);
1570         __add_ptr_list(&backup, big_expression_stack, 0);
1571         __add_ptr_list(&backup, big_condition_stack, 0);
1572         __add_ptr_list(&backup, switch_expr_stack, 0);
1573
1574         __add_ptr_list(&backup, cur_func_sym, 0);
1575
1576         __add_ptr_list(&backup, __prev_stmt, 0);
1577         __add_ptr_list(&backup, __cur_stmt, 0);
1578         __add_ptr_list(&backup, __next_stmt, 0);
1579
1580 }
1581
1582 static void *pop_backup(void)
1583 {
1584         void *ret;
1585
1586         ret = last_ptr_list(backup);
1587         delete_ptr_list_last(&backup);
1588         return ret;
1589 }
1590
1591 static void restore_flow_state(void)
1592 {
1593         __next_stmt = pop_backup();
1594         __cur_stmt = pop_backup();
1595         __prev_stmt = pop_backup();
1596
1597         cur_func_sym = pop_backup();
1598         switch_expr_stack = pop_backup();
1599         big_condition_stack = pop_backup();
1600         big_expression_stack = pop_backup();
1601         big_statement_stack = pop_backup();
1602         final_pass = PTR_INT(pop_backup()) >> 2;
1603         loop_count = PTR_INT(pop_backup()) >> 2;
1604         loop_num = PTR_INT(pop_backup()) >> 2;
1605 }
1606
1607 static void parse_inline(struct expression *call)
1608 {
1609         struct symbol *base_type;
1610         char *cur_func_bak = cur_func;  /* not aligned correctly for backup */
1611         struct timeval time_backup = fn_start_time;
1612         struct expression *orig_inline = __inline_fn;
1613         int orig_budget;
1614
1615         save_flow_state();
1616
1617         __pass_to_client(call, INLINE_FN_START);
1618         final_pass = 0;  /* don't print anything */
1619         __inline_fn = call;
1620         orig_budget = inline_budget;
1621         inline_budget = inline_budget - 5;
1622
1623         base_type = get_base_type(call->fn->symbol);
1624         cur_func_sym = call->fn->symbol;
1625         if (call->fn->symbol->ident)
1626                 cur_func = call->fn->symbol->ident->name;
1627         else
1628                 cur_func = NULL;
1629         set_position(call->fn->symbol->pos);
1630
1631         save_all_states();
1632         big_statement_stack = NULL;
1633         big_expression_stack = NULL;
1634         big_condition_stack = NULL;
1635         switch_expr_stack = NULL;
1636
1637         sm_debug("inline function:  %s\n", cur_func);
1638         __unnullify_path();
1639         loop_num = 0;
1640         loop_count = 0;
1641         start_function_definition(call->fn->symbol);
1642         __split_stmt(base_type->stmt);
1643         __split_stmt(base_type->inline_stmt);
1644         __pass_to_client(call->fn->symbol, END_FUNC_HOOK);
1645         __pass_to_client(call->fn->symbol, AFTER_FUNC_HOOK);
1646
1647         free_expression_stack(&switch_expr_stack);
1648         __free_ptr_list((struct ptr_list **)&big_statement_stack);
1649         nullify_path();
1650         free_goto_stack();
1651
1652         restore_flow_state();
1653         fn_start_time = time_backup;
1654         cur_func = cur_func_bak;
1655
1656         restore_all_states();
1657         set_position(call->pos);
1658         __inline_fn = orig_inline;
1659         inline_budget = orig_budget;
1660         __pass_to_client(call, INLINE_FN_END);
1661 }
1662
1663 static struct symbol_list *inlines_called;
1664 static void add_inline_function(struct symbol *sym)
1665 {
1666         static struct symbol_list *already_added;
1667         struct symbol *tmp;
1668
1669         FOR_EACH_PTR(already_added, tmp) {
1670                 if (tmp == sym)
1671                         return;
1672         } END_FOR_EACH_PTR(tmp);
1673
1674         add_ptr_list(&already_added, sym);
1675         add_ptr_list(&inlines_called, sym);
1676 }
1677
1678 static void process_inlines(void)
1679 {
1680         struct symbol *tmp;
1681
1682         FOR_EACH_PTR(inlines_called, tmp) {
1683                 split_function(tmp);
1684         } END_FOR_EACH_PTR(tmp);
1685         free_ptr_list(&inlines_called);
1686 }
1687
1688 static struct symbol *get_last_scoped_symbol(struct symbol_list *big_list, int use_static)
1689 {
1690         struct symbol *sym;
1691
1692         FOR_EACH_PTR_REVERSE(big_list, sym) {
1693                 if (!sym->scope)
1694                         continue;
1695                 if (use_static && sym->ctype.modifiers & MOD_STATIC)
1696                         return sym;
1697                 if (!use_static && !(sym->ctype.modifiers & MOD_STATIC))
1698                         return sym;
1699         } END_FOR_EACH_PTR_REVERSE(sym);
1700
1701         return NULL;
1702 }
1703
1704 static bool interesting_function(struct symbol *sym)
1705 {
1706         static int prev_stream = -1;
1707         static bool prev_answer;
1708         const char *filename;
1709         int len;
1710
1711         if (!(sym->ctype.modifiers & MOD_INLINE))
1712                 return true;
1713
1714         if (sym->pos.stream == prev_stream)
1715                 return prev_answer;
1716
1717         prev_stream = sym->pos.stream;
1718         prev_answer = false;
1719
1720         filename = stream_name(sym->pos.stream);
1721         len = strlen(filename);
1722         if (len > 0 && filename[len - 1] == 'c')
1723                 prev_answer = true;
1724         return prev_answer;
1725 }
1726
1727 static void split_inlines_in_scope(struct symbol *sym)
1728 {
1729         struct symbol *base;
1730         struct symbol_list *scope_list;
1731         int stream;
1732
1733         scope_list = sym->scope->symbols;
1734         stream = sym->pos.stream;
1735
1736         /* find the last static symbol in the file */
1737         FOR_EACH_PTR_REVERSE(scope_list, sym) {
1738                 if (sym->pos.stream != stream)
1739                         continue;
1740                 if (sym->type != SYM_NODE)
1741                         continue;
1742                 base = get_base_type(sym);
1743                 if (!base)
1744                         continue;
1745                 if (base->type != SYM_FN)
1746                         continue;
1747                 if (!base->inline_stmt)
1748                         continue;
1749                 if (!interesting_function(sym))
1750                         continue;
1751                 add_inline_function(sym);
1752         } END_FOR_EACH_PTR_REVERSE(sym);
1753
1754         process_inlines();
1755 }
1756
1757 static void split_inlines(struct symbol_list *sym_list)
1758 {
1759         struct symbol *sym;
1760
1761         sym = get_last_scoped_symbol(sym_list, 0);
1762         if (sym)
1763                 split_inlines_in_scope(sym);
1764         sym = get_last_scoped_symbol(sym_list, 1);
1765         if (sym)
1766                 split_inlines_in_scope(sym);
1767 }
1768
1769 static struct stree *clone_estates_perm(struct stree *orig)
1770 {
1771         struct stree *ret = NULL;
1772         struct sm_state *tmp;
1773
1774         FOR_EACH_SM(orig, tmp) {
1775                 set_state_stree_perm(&ret, tmp->owner, tmp->name, tmp->sym, clone_estate_perm(tmp->state));
1776         } END_FOR_EACH_SM(tmp);
1777
1778         return ret;
1779 }
1780
1781 struct position last_pos;
1782 static void split_c_file_functions(struct symbol_list *sym_list)
1783 {
1784         struct symbol *sym;
1785
1786         __unnullify_path();
1787         FOR_EACH_PTR(sym_list, sym) {
1788                 set_position(sym->pos);
1789                 if (sym->type != SYM_NODE || get_base_type(sym)->type != SYM_FN) {
1790                         __pass_to_client(sym, BASE_HOOK);
1791                         fake_global_assign(sym);
1792                 }
1793         } END_FOR_EACH_PTR(sym);
1794         global_states = clone_estates_perm(get_all_states_stree(SMATCH_EXTRA));
1795         nullify_path();
1796
1797         FOR_EACH_PTR(sym_list, sym) {
1798                 set_position(sym->pos);
1799                 last_pos = sym->pos;
1800                 if (!interesting_function(sym))
1801                         continue;
1802                 if (sym->type == SYM_NODE && get_base_type(sym)->type == SYM_FN) {
1803                         split_function(sym);
1804                         process_inlines();
1805                 }
1806                 last_pos = sym->pos;
1807         } END_FOR_EACH_PTR(sym);
1808         split_inlines(sym_list);
1809         __pass_to_client(sym_list, END_FILE_HOOK);
1810 }
1811
1812 static int final_before_fake;
1813 void init_fake_env(void)
1814 {
1815         if (!in_fake_env)
1816                 final_before_fake = final_pass;
1817         in_fake_env++;
1818         __push_fake_cur_stree();
1819         final_pass = 0;
1820 }
1821
1822 void end_fake_env(void)
1823 {
1824         __pop_fake_cur_stree();
1825         in_fake_env--;
1826         if (!in_fake_env)
1827                 final_pass = final_before_fake;
1828 }
1829
1830 static void open_output_files(char *base_file)
1831 {
1832         char buf[256];
1833
1834         snprintf(buf, sizeof(buf), "%s.smatch", base_file);
1835         sm_outfd = fopen(buf, "w");
1836         if (!sm_outfd) {
1837                 printf("Error:  Cannot open %s\n", buf);
1838                 exit(1);
1839         }
1840
1841         if (!option_info)
1842                 return;
1843
1844         snprintf(buf, sizeof(buf), "%s.smatch.sql", base_file);
1845         sql_outfd = fopen(buf, "w");
1846         if (!sql_outfd) {
1847                 printf("Error:  Cannot open %s\n", buf);
1848                 exit(1);
1849         }
1850
1851         snprintf(buf, sizeof(buf), "%s.smatch.caller_info", base_file);
1852         caller_info_fd = fopen(buf, "w");
1853         if (!caller_info_fd) {
1854                 printf("Error:  Cannot open %s\n", buf);
1855                 exit(1);
1856         }
1857 }
1858
1859 void smatch(int argc, char **argv)
1860 {
1861         struct string_list *filelist = NULL;
1862         struct symbol_list *sym_list;
1863         struct timeval stop, start;
1864         char *path;
1865         int len;
1866
1867         gettimeofday(&start, NULL);
1868
1869         if (argc < 2) {
1870                 printf("Usage:  smatch [--debug] <filename.c>\n");
1871                 exit(1);
1872         }
1873         sparse_initialize(argc, argv, &filelist);
1874         set_valid_ptr_max();
1875         alloc_valid_ptr_rl();
1876         FOR_EACH_PTR_NOTAG(filelist, base_file) {
1877                 path = getcwd(NULL, 0);
1878                 free(full_base_file);
1879                 if (path) {
1880                         len = strlen(path) + 1 + strlen(base_file) + 1;
1881                         full_base_file = malloc(len);
1882                         snprintf(full_base_file, len, "%s/%s", path, base_file);
1883                 } else {
1884                         full_base_file = alloc_string(base_file);
1885                 }
1886                 if (option_file_output)
1887                         open_output_files(base_file);
1888                 sym_list = sparse_keep_tokens(base_file);
1889                 split_c_file_functions(sym_list);
1890         } END_FOR_EACH_PTR_NOTAG(base_file);
1891
1892         gettimeofday(&stop, NULL);
1893
1894         set_position(last_pos);
1895         if (option_time)
1896                 sm_msg("time: %lu", stop.tv_sec - start.tv_sec);
1897         if (option_mem)
1898                 sm_msg("mem: %luKb", get_max_memory());
1899 }