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 final_pass;
  30 int __inline_call;
  31 struct expression  *__inline_fn;
  32
  33 static int __smatch_lineno = 0;
  34
  35 static char *base_file;
  36 static const char *filename;
  37 static char *pathname;
  38 static char *full_filename;
  39 static char *cur_func;
  40 static unsigned int loop_count;
  41 static int last_goto_statement_handled;
  42 int __expr_stmt_count;
  43 int __in_function_def;
  44 static struct expression_list *switch_expr_stack = NULL;
  45 static struct expression_list *post_op_stack = NULL;
  46
  47 struct expression_list *big_expression_stack;
  48 struct statement_list *big_statement_stack;
  49 struct statement *__prev_stmt;
  50 struct statement *__cur_stmt;
  51 struct statement *__next_stmt;
  52 int __in_pre_condition = 0;
  53 int __bail_on_rest_of_function = 0;
  54 static struct timeval fn_start_time;
  55 char *get_function(void) { return cur_func; }
  56 int get_lineno(void) { return __smatch_lineno; }
  57 int inside_loop(void) { return !!loop_count; }
  58 int definitely_inside_loop(void) { return !!(loop_count & ~0x80000000); }
  59 struct expression *get_switch_expr(void) { return top_expression(switch_expr_stack); }
  60 int in_expression_statement(void) { return !!__expr_stmt_count; }
  61
  62 static void split_symlist(struct symbol_list *sym_list);
  63 static void split_declaration(struct symbol_list *sym_list);
  64 static void split_expr_list(struct expression_list *expr_list, struct expression *parent);
  65 static void add_inline_function(struct symbol *sym);
  66 static void parse_inline(struct expression *expr);
  67
  68 int option_assume_loops = 0;
  69 int option_two_passes = 0;
  70 struct symbol *cur_func_sym = NULL;
  71 struct stree *global_states;
  72
  73 long long valid_ptr_min = 4096;
  74 long long valid_ptr_max = 2117777777;
  75 sval_t valid_ptr_min_sval = {
  76         .type = &ptr_ctype,
  77         {.value = 4096},
  78 };
  79 sval_t valid_ptr_max_sval = {
  80         .type = &ptr_ctype,
  81         {.value = LONG_MAX - 100000},
  82 };
  83
  84 static void set_valid_ptr_max(void)
  85 {
  86         if (type_bits(&ptr_ctype) == 32)
  87                 valid_ptr_max = 2117777777;
  88         else if (type_bits(&ptr_ctype) == 64)
  89                 valid_ptr_max = 2117777777777777777LL;
  90
  91         valid_ptr_max_sval.value = valid_ptr_max;
  92 }
  93
  94 int outside_of_function(void)
  95 {
  96         return cur_func_sym == NULL;
  97 }
  98
  99 const char *get_filename(void)
 100 {
 101         if (option_info)
 102                 return base_file;
 103         if (option_full_path)
 104                 return full_filename;
 105         return filename;
 106 }
 107
 108 const char *get_base_file(void)
 109 {
 110         return base_file;
 111 }
 112
 113 static void set_position(struct position pos)
 114 {
 115         int len;
 116         static int prev_stream = -1;
 117
 118         if (pos.stream == 0 && pos.line == 0)
 119                 return;
 120
 121         __smatch_lineno = pos.line;
 122
 123         if (pos.stream == prev_stream)
 124                 return;
 125
 126         filename = stream_name(pos.stream);
 127
 128         free(full_filename);
 129         pathname = getcwd(NULL, 0);
 130         if (pathname) {
 131                 len = strlen(pathname) + 1 + strlen(filename) + 1;
 132                 full_filename = malloc(len);
 133                 snprintf(full_filename, len, "%s/%s", pathname, filename);
 134         } else {
 135                 full_filename = alloc_string(filename);
 136         }
 137         free(pathname);
 138 }
 139
 140 void set_parent_expr(struct expression *expr, struct expression *parent)
 141 {
 142         if (!expr)
 143                 return;
 144         expr->parent = parent;
 145 }
 146
 147 static void set_parent_stmt(struct statement *stmt, struct statement *parent)
 148 {
 149         if (!stmt)
 150                 return;
 151         stmt->parent = parent;
 152 }
 153
 154 int is_assigned_call(struct expression *expr)
 155 {
 156         struct expression *tmp;
 157
 158         FOR_EACH_PTR_REVERSE(big_expression_stack, tmp) {
 159                 if (tmp->type == EXPR_ASSIGNMENT && tmp->op == '=' &&
 160                     strip_expr(tmp->right) == expr)
 161                         return 1;
 162                 if (tmp->pos.line < expr->pos.line)
 163                         return 0;
 164         } END_FOR_EACH_PTR_REVERSE(tmp);
 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 int inlinable(struct expression *expr)
 187 {
 188         struct symbol *sym;
 189         struct statement *last_stmt = NULL;
 190
 191         if (__inline_fn)  /* don't nest */
 192                 return 0;
 193
 194         if (expr->type != EXPR_SYMBOL || !expr->symbol)
 195                 return 0;
 196         if (is_no_inline_function(expr->symbol->ident->name))
 197                 return 0;
 198         sym = get_base_type(expr->symbol);
 199         if (sym->stmt && sym->stmt->type == STMT_COMPOUND) {
 200                 if (ptr_list_size((struct ptr_list *)sym->stmt->stmts) > 10)
 201                         return 0;
 202                 if (sym->stmt->type != STMT_COMPOUND)
 203                         return 0;
 204                 last_stmt = last_ptr_list((struct ptr_list *)sym->stmt->stmts);
 205         }
 206         if (sym->inline_stmt && sym->inline_stmt->type == STMT_COMPOUND) {
 207                 if (ptr_list_size((struct ptr_list *)sym->inline_stmt->stmts) > 10)
 208                         return 0;
 209                 if (sym->inline_stmt->type != STMT_COMPOUND)
 210                         return 0;
 211                 last_stmt = last_ptr_list((struct ptr_list *)sym->inline_stmt->stmts);
 212         }
 213
 214         if (!last_stmt)
 215                 return 0;
 216
 217         /* the magic numbers in this function are pulled out of my bum. */
 218         if (last_stmt->pos.line > sym->pos.line + 20)
 219                 return 0;
 220
 221         return 1;
 222 }
 223
 224 void __process_post_op_stack(void)
 225 {
 226         struct expression *expr;
 227
 228         FOR_EACH_PTR(post_op_stack, expr) {
 229                 __pass_to_client(expr, OP_HOOK);
 230         } END_FOR_EACH_PTR(expr);
 231
 232         __free_ptr_list((struct ptr_list **)&post_op_stack);
 233 }
 234
 235 static int handle_comma_assigns(struct expression *expr)
 236 {
 237         struct expression *right;
 238         struct expression *assign;
 239
 240         right = strip_expr(expr->right);
 241         if (right->type != EXPR_COMMA)
 242                 return 0;
 243
 244         __split_expr(right->left);
 245         __process_post_op_stack();
 246
 247         assign = assign_expression(expr->left, right->right);
 248         __split_expr(assign);
 249
 250         return 1;
 251 }
 252
 253 /* This is to handle *p++ = foo; assignments */
 254 static int handle_postop_assigns(struct expression *expr)
 255 {
 256         struct expression *left, *fake_left;
 257         struct expression *assign;
 258
 259         left = strip_expr(expr->left);
 260         if (left->type != EXPR_PREOP || left->op != '*')
 261                 return 0;
 262         left = strip_expr(left->unop);
 263         if (left->type != EXPR_POSTOP)
 264                 return 0;
 265
 266         fake_left = deref_expression(strip_expr(left->unop));
 267         assign = assign_expression(fake_left, expr->right);
 268
 269         __split_expr(assign);
 270         __split_expr(expr->left);
 271
 272         return 1;
 273 }
 274
 275 static int prev_expression_is_getting_address(struct expression *expr)
 276 {
 277         struct expression *parent;
 278
 279         do {
 280                 parent = expr->parent;
 281
 282                 if (!parent)
 283                         return 0;
 284                 if (parent->type == EXPR_PREOP && parent->op == '&')
 285                         return 1;
 286                 if (parent->type == EXPR_PREOP && parent->op == '(')
 287                         goto next;
 288                 if (parent->type == EXPR_DEREF && parent->op == '.')
 289                         goto next;
 290
 291                 return 0;
 292 next:
 293                 expr = parent;
 294         } while (1);
 295 }
 296
 297 void __split_expr(struct expression *expr)
 298 {
 299         if (!expr)
 300                 return;
 301
 302         // sm_msg(" Debug expr_type %d %s", expr->type, show_special(expr->op));
 303
 304         if (__in_fake_assign && expr->type != EXPR_ASSIGNMENT)
 305                 return;
 306         if (__in_fake_assign >= 4)  /* don't allow too much nesting */
 307                 return;
 308
 309         push_expression(&big_expression_stack, expr);
 310         set_position(expr->pos);
 311         __pass_to_client(expr, EXPR_HOOK);
 312
 313         switch (expr->type) {
 314         case EXPR_PREOP:
 315                 set_parent_expr(expr->unop, expr);
 316
 317                 if (expr->op == '*' &&
 318                     !prev_expression_is_getting_address(expr))
 319                         __pass_to_client(expr, DEREF_HOOK);
 320                 __split_expr(expr->unop);
 321                 __pass_to_client(expr, OP_HOOK);
 322                 break;
 323         case EXPR_POSTOP:
 324                 set_parent_expr(expr->unop, expr);
 325
 326                 __split_expr(expr->unop);
 327                 push_expression(&post_op_stack, expr);
 328                 break;
 329         case EXPR_STATEMENT:
 330                 __expr_stmt_count++;
 331                 if (expr->statement && !expr->statement->parent) {
 332                         set_parent_stmt(expr->statement,
 333                                         last_ptr_list((struct ptr_list *)big_statement_stack));
 334                 }
 335                 __split_stmt(expr->statement);
 336                 __expr_stmt_count--;
 337                 break;
 338         case EXPR_LOGICAL:
 339         case EXPR_COMPARE:
 340                 set_parent_expr(expr->left, expr);
 341                 set_parent_expr(expr->right, expr);
 342
 343                 __pass_to_client(expr, LOGIC_HOOK);
 344                 __handle_logic(expr);
 345                 break;
 346         case EXPR_BINOP:
 347                 set_parent_expr(expr->left, expr);
 348                 set_parent_expr(expr->right, expr);
 349
 350                 __pass_to_client(expr, BINOP_HOOK);
 351         case EXPR_COMMA:
 352                 set_parent_expr(expr->left, expr);
 353                 set_parent_expr(expr->right, expr);
 354
 355                 __split_expr(expr->left);
 356                 __process_post_op_stack();
 357                 __split_expr(expr->right);
 358                 break;
 359         case EXPR_ASSIGNMENT: {
 360                 struct expression *tmp;
 361
 362                 set_parent_expr(expr->left, expr);
 363                 set_parent_expr(expr->right, expr);
 364
 365                 if (!expr->right)
 366                         break;
 367
 368                 __pass_to_client(expr, RAW_ASSIGNMENT_HOOK);
 369
 370                 /* foo = !bar() */
 371                 if (__handle_condition_assigns(expr))
 372                         break;
 373                 /* foo = (x < 5 ? foo : 5); */
 374                 if (__handle_select_assigns(expr))
 375                         break;
 376                 /* foo = ({frob(); frob(); frob(); 1;}) */
 377                 if (__handle_expr_statement_assigns(expr))
 378                         break;
 379                 /* foo = (3, 4); */
 380                 if (handle_comma_assigns(expr))
 381                         break;
 382                 if (handle_postop_assigns(expr))
 383                         break;
 384
 385                 __split_expr(expr->right);
 386                 if (outside_of_function())
 387                         __pass_to_client(expr, GLOBAL_ASSIGNMENT_HOOK);
 388                 else
 389                         __pass_to_client(expr, ASSIGNMENT_HOOK);
 390
 391                 __fake_struct_member_assignments(expr);
 392
 393                 tmp = strip_expr(expr->right);
 394                 if (expr->op == '=' && tmp->type == EXPR_CALL) {
 395                         __pass_to_client(expr, CALL_ASSIGNMENT_HOOK);
 396                 }
 397                 if (get_macro_name(tmp->pos) &&
 398                     get_macro_name(expr->pos) != get_macro_name(tmp->pos))
 399                         __pass_to_client(expr, MACRO_ASSIGNMENT_HOOK);
 400                 __split_expr(expr->left);
 401                 break;
 402         }
 403         case EXPR_DEREF:
 404                 set_parent_expr(expr->deref, expr);
 405
 406                 __pass_to_client(expr, DEREF_HOOK);
 407                 __split_expr(expr->deref);
 408                 break;
 409         case EXPR_SLICE:
 410                 set_parent_expr(expr->base, expr);
 411
 412                 __split_expr(expr->base);
 413                 break;
 414         case EXPR_CAST:
 415         case EXPR_FORCE_CAST:
 416                 set_parent_expr(expr->cast_expression, expr);
 417
 418                 __pass_to_client(expr, CAST_HOOK);
 419                 __split_expr(expr->cast_expression);
 420                 break;
 421         case EXPR_SIZEOF:
 422                 if (expr->cast_expression)
 423                         __pass_to_client(strip_parens(expr->cast_expression),
 424                                          SIZEOF_HOOK);
 425                 break;
 426         case EXPR_OFFSETOF:
 427         case EXPR_ALIGNOF:
 428                 evaluate_expression(expr);
 429                 break;
 430         case EXPR_CONDITIONAL:
 431         case EXPR_SELECT:
 432                 set_parent_expr(expr->conditional, expr);
 433                 set_parent_expr(expr->cond_true, expr);
 434                 set_parent_expr(expr->cond_false, expr);
 435
 436                 if (known_condition_true(expr->conditional)) {
 437                         __split_expr(expr->cond_true);
 438                         break;
 439                 }
 440                 if (known_condition_false(expr->conditional)) {
 441                         __split_expr(expr->cond_false);
 442                         break;
 443                 }
 444                 __pass_to_client(expr, SELECT_HOOK);
 445                 __split_whole_condition(expr->conditional);
 446                 __split_expr(expr->cond_true);
 447                 __push_true_states();
 448                 __use_false_states();
 449                 __split_expr(expr->cond_false);
 450                 __merge_true_states();
 451                 break;
 452         case EXPR_CALL:
 453                 set_parent_expr(expr->fn, expr);
 454
 455                 if (sym_name_is("__builtin_constant_p", expr->fn))
 456                         break;
 457                 split_expr_list(expr->args, expr);
 458                 __split_expr(expr->fn);
 459                 if (is_inline_func(expr->fn))
 460                         add_inline_function(expr->fn->symbol);
 461                 if (inlinable(expr->fn))
 462                         __inline_call = 1;
 463                 __process_post_op_stack();
 464                 __pass_to_client(expr, FUNCTION_CALL_HOOK);
 465                 __inline_call = 0;
 466                 if (inlinable(expr->fn)) {
 467                         parse_inline(expr);
 468                 }
 469                 __pass_to_client(expr, CALL_HOOK_AFTER_INLINE);
 470                 if (is_noreturn_func(expr->fn))
 471                         nullify_path();
 472                 break;
 473         case EXPR_INITIALIZER:
 474                 split_expr_list(expr->expr_list, expr);
 475                 break;
 476         case EXPR_IDENTIFIER:
 477                 set_parent_expr(expr->ident_expression, expr);
 478                 __split_expr(expr->ident_expression);
 479                 break;
 480         case EXPR_INDEX:
 481                 set_parent_expr(expr->idx_expression, expr);
 482                 __split_expr(expr->idx_expression);
 483                 break;
 484         case EXPR_POS:
 485                 set_parent_expr(expr->init_expr, expr);
 486                 __split_expr(expr->init_expr);
 487                 break;
 488         case EXPR_SYMBOL:
 489                 __pass_to_client(expr, SYM_HOOK);
 490                 break;
 491         case EXPR_STRING:
 492                 __pass_to_client(expr, STRING_HOOK);
 493                 break;
 494         default:
 495                 break;
 496         };
 497         pop_expression(&big_expression_stack);
 498 }
 499
 500 static int is_forever_loop(struct statement *stmt)
 501 {
 502         struct expression *expr;
 503
 504         expr = strip_expr(stmt->iterator_pre_condition);
 505         if (!expr)
 506                 expr = stmt->iterator_post_condition;
 507         if (!expr) {
 508                 /* this is a for(;;) loop... */
 509                 return 1;
 510         }
 511
 512         if (expr->type == EXPR_VALUE && expr->value == 1)
 513                 return 1;
 514
 515         return 0;
 516 }
 517
 518 static int loop_num;
 519 static char *get_loop_name(int num)
 520 {
 521         char buf[256];
 522
 523         snprintf(buf, 255, "-loop%d", num);
 524         buf[255] = '\0';
 525         return alloc_sname(buf);
 526 }
 527
 528 /*
 529  * Pre Loops are while and for loops.
 530  */
 531 static void handle_pre_loop(struct statement *stmt)
 532 {
 533         int once_through; /* we go through the loop at least once */
 534         struct sm_state *extra_sm = NULL;
 535         int unchanged = 0;
 536         char *loop_name;
 537         struct stree *stree = NULL;
 538         struct sm_state *sm = NULL;
 539
 540         loop_name = get_loop_name(loop_num);
 541         loop_num++;
 542
 543         __split_stmt(stmt->iterator_pre_statement);
 544         __prev_stmt = stmt->iterator_pre_statement;
 545
 546         once_through = implied_condition_true(stmt->iterator_pre_condition);
 547
 548         loop_count++;
 549         __push_continues();
 550         __push_breaks();
 551
 552         __merge_gotos(loop_name);
 553
 554         extra_sm = __extra_handle_canonical_loops(stmt, &stree);
 555         __in_pre_condition++;
 556         __pass_to_client(stmt, PRELOOP_HOOK);
 557         __split_whole_condition(stmt->iterator_pre_condition);
 558         __in_pre_condition--;
 559         FOR_EACH_SM(stree, sm) {
 560                 set_state(sm->owner, sm->name, sm->sym, sm->state);
 561         } END_FOR_EACH_SM(sm);
 562         free_stree(&stree);
 563         if (extra_sm)
 564                 extra_sm = get_sm_state(extra_sm->owner, extra_sm->name, extra_sm->sym);
 565
 566         if (option_assume_loops)
 567                 once_through = 1;
 568
 569         __split_stmt(stmt->iterator_statement);
 570         if (is_forever_loop(stmt)) {
 571                 __merge_continues();
 572                 __save_gotos(loop_name);
 573
 574                 __push_fake_cur_stree();
 575                 __split_stmt(stmt->iterator_post_statement);
 576                 stree = __pop_fake_cur_stree();
 577
 578                 __discard_false_states();
 579                 __use_breaks();
 580
 581                 if (!__path_is_null())
 582                         __merge_stree_into_cur(stree);
 583                 free_stree(&stree);
 584         } else {
 585                 __merge_continues();
 586                 unchanged = __iterator_unchanged(extra_sm);
 587                 __split_stmt(stmt->iterator_post_statement);
 588                 __prev_stmt = stmt->iterator_post_statement;
 589                 __cur_stmt = stmt;
 590
 591                 __save_gotos(loop_name);
 592                 __in_pre_condition++;
 593                 __split_whole_condition(stmt->iterator_pre_condition);
 594                 __in_pre_condition--;
 595                 nullify_path();
 596                 __merge_false_states();
 597                 if (once_through)
 598                         __discard_false_states();
 599                 else
 600                         __merge_false_states();
 601
 602                 if (extra_sm && unchanged)
 603                         __extra_pre_loop_hook_after(extra_sm,
 604                                                 stmt->iterator_post_statement,
 605                                                 stmt->iterator_pre_condition);
 606                 __merge_breaks();
 607         }
 608         loop_count--;
 609 }
 610
 611 /*
 612  * Post loops are do {} while();
 613  */
 614 static void handle_post_loop(struct statement *stmt)
 615 {
 616         char *loop_name;
 617
 618         loop_name = get_loop_name(loop_num);
 619         loop_num++;
 620         loop_count++;
 621
 622         __push_continues();
 623         __push_breaks();
 624         __merge_gotos(loop_name);
 625         __split_stmt(stmt->iterator_statement);
 626         __merge_continues();
 627         if (!is_zero(stmt->iterator_post_condition))
 628                 __save_gotos(loop_name);
 629
 630         if (is_forever_loop(stmt)) {
 631                 __use_breaks();
 632         } else {
 633                 __split_whole_condition(stmt->iterator_post_condition);
 634                 __use_false_states();
 635                 __merge_breaks();
 636         }
 637         loop_count--;
 638 }
 639
 640 static int empty_statement(struct statement *stmt)
 641 {
 642         if (!stmt)
 643                 return 0;
 644         if (stmt->type == STMT_EXPRESSION && !stmt->expression)
 645                 return 1;
 646         return 0;
 647 }
 648
 649 static int last_stmt_on_same_line(void)
 650 {
 651         struct statement *stmt;
 652         int i = 0;
 653
 654         FOR_EACH_PTR_REVERSE(big_statement_stack, stmt) {
 655                 if (!i++)
 656                         continue;
 657                 if  (stmt->pos.line == get_lineno())
 658                         return 1;
 659                 return 0;
 660         } END_FOR_EACH_PTR_REVERSE(stmt);
 661         return 0;
 662 }
 663
 664 static void split_asm_constraints(struct expression_list *expr_list)
 665 {
 666         struct expression *expr;
 667         int state = 0;
 668
 669         FOR_EACH_PTR(expr_list, expr) {
 670                 switch (state) {
 671                 case 0: /* identifier */
 672                 case 1: /* constraint */
 673                         state++;
 674                         continue;
 675                 case 2: /* expression */
 676                         state = 0;
 677                         __split_expr(expr);
 678                         continue;
 679                 }
 680         } END_FOR_EACH_PTR(expr);
 681 }
 682
 683 static int is_case_val(struct statement *stmt, sval_t sval)
 684 {
 685         sval_t case_sval;
 686
 687         if (stmt->type != STMT_CASE)
 688                 return 0;
 689         if (!stmt->case_expression) {
 690                 __set_default();
 691                 return 1;
 692         }
 693         if (!get_value(stmt->case_expression, &case_sval))
 694                 return 0;
 695         if (case_sval.value == sval.value)
 696                 return 1;
 697         return 0;
 698 }
 699
 700 static struct range_list *get_case_rl(struct expression *switch_expr,
 701                                       struct expression *case_expr,
 702                                       struct expression *case_to)
 703 {
 704         sval_t start, end;
 705         struct range_list *rl = NULL;
 706         struct symbol *switch_type;
 707
 708         switch_type = get_type(switch_expr);
 709         if (get_value(case_to, &end) && get_value(case_expr, &start)) {
 710                 start = sval_cast(switch_type, start);
 711                 end = sval_cast(switch_type, end);
 712                 add_range(&rl, start, end);
 713         } else if (get_value(case_expr, &start)) {
 714                 start = sval_cast(switch_type, start);
 715                 add_range(&rl, start, start);
 716         }
 717
 718         return rl;
 719 }
 720
 721 static void split_known_switch(struct statement *stmt, sval_t sval)
 722 {
 723         struct statement *tmp;
 724         struct range_list *rl;
 725
 726         __split_expr(stmt->switch_expression);
 727         sval = sval_cast(get_type(stmt->switch_expression), sval);
 728
 729         push_expression(&switch_expr_stack, stmt->switch_expression);
 730         __save_switch_states(top_expression(switch_expr_stack));
 731         nullify_path();
 732         __push_default();
 733         __push_breaks();
 734
 735         stmt = stmt->switch_statement;
 736
 737         __push_scope_hooks();
 738         FOR_EACH_PTR(stmt->stmts, tmp) {
 739                 __smatch_lineno = tmp->pos.line;
 740                 if (is_case_val(tmp, sval)) {
 741                         rl = alloc_rl(sval, sval);
 742                         __merge_switches(top_expression(switch_expr_stack), rl);
 743                         __pass_case_to_client(top_expression(switch_expr_stack), rl);
 744                 }
 745                 if (__path_is_null())
 746                         continue;
 747                 __split_stmt(tmp);
 748                 if (__path_is_null()) {
 749                         __set_default();
 750                         goto out;
 751                 }
 752         } END_FOR_EACH_PTR(tmp);
 753 out:
 754         __call_scope_hooks();
 755         if (!__pop_default())
 756                 __merge_switches(top_expression(switch_expr_stack), NULL);
 757         __discard_switches();
 758         __merge_breaks();
 759         pop_expression(&switch_expr_stack);
 760 }
 761
 762 static void split_case(struct statement *stmt)
 763 {
 764         struct range_list *rl = NULL;
 765
 766         rl = get_case_rl(top_expression(switch_expr_stack),
 767                          stmt->case_expression, stmt->case_to);
 768         while (stmt->case_statement->type == STMT_CASE) {
 769                 struct range_list *tmp;
 770
 771                 tmp = get_case_rl(top_expression(switch_expr_stack),
 772                                   stmt->case_statement->case_expression,
 773                                   stmt->case_statement->case_to);
 774                 if (!tmp)
 775                         break;
 776                 rl = rl_union(rl, tmp);
 777                 if (!stmt->case_expression)
 778                         __set_default();
 779                 stmt = stmt->case_statement;
 780         }
 781
 782         __merge_switches(top_expression(switch_expr_stack), rl);
 783
 784         if (!stmt->case_expression)
 785                 __set_default();
 786         __split_stmt(stmt->case_statement);
 787 }
 788
 789 static int taking_too_long(void)
 790 {
 791         int ms;
 792
 793         ms = ms_since(&fn_start_time);
 794         if (ms > 1000 * 60 * 5)  /* five minutes */
 795                 return 1;
 796         return 0;
 797 }
 798
 799 static int is_last_stmt(struct statement *cur_stmt)
 800 {
 801         struct symbol *fn = get_base_type(cur_func_sym);
 802         struct statement *stmt;
 803
 804         if (!fn)
 805                 return 0;
 806         stmt = fn->stmt;
 807         if (!stmt)
 808                 stmt = fn->inline_stmt;
 809         if (!stmt || stmt->type != STMT_COMPOUND)
 810                 return 0;
 811         stmt = last_ptr_list((struct ptr_list *)stmt->stmts);
 812         if (stmt && stmt->type == STMT_LABEL)
 813                 stmt = stmt->label_statement;
 814         if (stmt == cur_stmt)
 815                 return 1;
 816         return 0;
 817 }
 818
 819 static void handle_backward_goto(struct statement *goto_stmt)
 820 {
 821         const char *goto_name, *label_name;
 822         struct statement *func_stmt;
 823         struct symbol *base_type = get_base_type(cur_func_sym);
 824         struct statement *tmp;
 825         int found = 0;
 826
 827         if (!option_info)
 828                 return;
 829         if (last_goto_statement_handled)
 830                 return;
 831         last_goto_statement_handled = 1;
 832
 833         if (!goto_stmt->goto_label ||
 834             goto_stmt->goto_label->type != SYM_LABEL ||
 835             !goto_stmt->goto_label->ident)
 836                 return;
 837         goto_name = goto_stmt->goto_label->ident->name;
 838
 839         func_stmt = base_type->stmt;
 840         if (!func_stmt)
 841                 func_stmt = base_type->inline_stmt;
 842         if (!func_stmt)
 843                 return;
 844         if (func_stmt->type != STMT_COMPOUND)
 845                 return;
 846
 847         FOR_EACH_PTR(func_stmt->stmts, tmp) {
 848                 if (!found) {
 849                         if (tmp->type != STMT_LABEL)
 850                                 continue;
 851                         if (!tmp->label_identifier ||
 852                             tmp->label_identifier->type != SYM_LABEL ||
 853                             !tmp->label_identifier->ident)
 854                                 continue;
 855                         label_name = tmp->label_identifier->ident->name;
 856                         if (strcmp(goto_name, label_name) != 0)
 857                                 continue;
 858                         found = 1;
 859                 }
 860                 __split_stmt(tmp);
 861         } END_FOR_EACH_PTR(tmp);
 862 }
 863
 864 static void fake_a_return(void)
 865 {
 866         struct symbol *return_type;
 867
 868         nullify_path();
 869         __unnullify_path();
 870
 871         return_type = get_real_base_type(cur_func_sym);
 872         return_type = get_real_base_type(return_type);
 873         if (return_type != &void_ctype) {
 874                 __pass_to_client(unknown_value_expression(NULL), RETURN_HOOK);
 875                 nullify_path();
 876         }
 877 }
 878
 879 static void fake_an_empty_default(struct position pos)
 880 {
 881         static struct statement none = {};
 882
 883         none.pos = pos;
 884         none.type = STMT_NONE;
 885         __merge_switches(top_expression(switch_expr_stack), NULL);
 886         __split_stmt(&none);
 887 }
 888
 889 static void split_compound(struct statement *stmt)
 890 {
 891         struct statement *prev = NULL;
 892         struct statement *cur = NULL;
 893         struct statement *next;
 894
 895         __push_scope_hooks();
 896
 897         FOR_EACH_PTR(stmt->stmts, next) {
 898                 /* just set them all ahead of time */
 899                 set_parent_stmt(next, stmt);
 900
 901                 if (cur) {
 902                         __prev_stmt = prev;
 903                         __next_stmt = next;
 904                         __cur_stmt = cur;
 905                         __split_stmt(cur);
 906                 }
 907                 prev = cur;
 908                 cur = next;
 909         } END_FOR_EACH_PTR(next);
 910         if (cur) {
 911                 __prev_stmt = prev;
 912                 __cur_stmt = cur;
 913                 __next_stmt = NULL;
 914                 __split_stmt(cur);
 915         }
 916
 917         __call_scope_hooks();
 918 }
 919
 920 void __split_label_stmt(struct statement *stmt)
 921 {
 922         if (stmt->label_identifier &&
 923             stmt->label_identifier->type == SYM_LABEL &&
 924             stmt->label_identifier->ident) {
 925                 loop_count |= 0x80000000;
 926                 __merge_gotos(stmt->label_identifier->ident->name);
 927         }
 928 }
 929
 930 static void find_asm_gotos(struct statement *stmt)
 931 {
 932         struct symbol *sym;
 933
 934         FOR_EACH_PTR(stmt->asm_labels, sym) {
 935                 if (sym->ident)
 936                         __save_gotos(sym->ident->name);
 937         } END_FOR_EACH_PTR(sym);
 938 }
 939
 940 void __split_stmt(struct statement *stmt)
 941 {
 942         sval_t sval;
 943
 944         if (!stmt)
 945                 goto out;
 946
 947         if (__bail_on_rest_of_function)
 948                 return;
 949
 950         if (out_of_memory() || taking_too_long()) {
 951
 952                 __bail_on_rest_of_function = 1;
 953                 final_pass = 1;
 954                 sm_msg("Function too hairy.  Giving up.");
 955                 fake_a_return();
 956                 final_pass = 0;  /* turn off sm_msg() from here */
 957                 return;
 958         }
 959
 960         add_ptr_list(&big_statement_stack, stmt);
 961         free_expression_stack(&big_expression_stack);
 962         set_position(stmt->pos);
 963         __pass_to_client(stmt, STMT_HOOK);
 964
 965         switch (stmt->type) {
 966         case STMT_DECLARATION:
 967                 split_declaration(stmt->declaration);
 968                 break;
 969         case STMT_RETURN:
 970                 __split_expr(stmt->ret_value);
 971                 __pass_to_client(stmt->ret_value, RETURN_HOOK);
 972                 __process_post_op_stack();
 973                 nullify_path();
 974                 break;
 975         case STMT_EXPRESSION:
 976                 __split_expr(stmt->expression);
 977                 break;
 978         case STMT_COMPOUND:
 979                 split_compound(stmt);
 980                 break;
 981         case STMT_IF:
 982                 set_parent_stmt(stmt->if_true, stmt);
 983                 set_parent_stmt(stmt->if_false, stmt);
 984
 985                 if (known_condition_true(stmt->if_conditional)) {
 986                         __split_stmt(stmt->if_true);
 987                         break;
 988                 }
 989                 if (known_condition_false(stmt->if_conditional)) {
 990                         __split_stmt(stmt->if_false);
 991                         break;
 992                 }
 993                 __split_whole_condition(stmt->if_conditional);
 994                 __split_stmt(stmt->if_true);
 995                 if (empty_statement(stmt->if_true) &&
 996                         last_stmt_on_same_line() &&
 997                         !get_macro_name(stmt->if_true->pos))
 998                         sm_msg("warn: if();");
 999                 __push_true_states();
1000                 __use_false_states();
1001                 __split_stmt(stmt->if_false);
1002                 __merge_true_states();
1003                 break;
1004         case STMT_ITERATOR:
1005                 set_parent_stmt(stmt->iterator_pre_statement, stmt);
1006                 set_parent_stmt(stmt->iterator_statement, stmt);
1007                 set_parent_stmt(stmt->iterator_post_statement, stmt);
1008
1009                 if (stmt->iterator_pre_condition)
1010                         handle_pre_loop(stmt);
1011                 else if (stmt->iterator_post_condition)
1012                         handle_post_loop(stmt);
1013                 else {
1014                         // these are for(;;) type loops.
1015                         handle_pre_loop(stmt);
1016                 }
1017                 break;
1018         case STMT_SWITCH:
1019                 set_parent_stmt(stmt->switch_statement, stmt);
1020
1021                 if (get_value(stmt->switch_expression, &sval)) {
1022                         split_known_switch(stmt, sval);
1023                         break;
1024                 }
1025                 __split_expr(stmt->switch_expression);
1026                 push_expression(&switch_expr_stack, stmt->switch_expression);
1027                 __save_switch_states(top_expression(switch_expr_stack));
1028                 nullify_path();
1029                 __push_default();
1030                 __push_breaks();
1031                 __split_stmt(stmt->switch_statement);
1032                 if (!__pop_default())
1033                         fake_an_empty_default(stmt->pos);
1034                 __discard_switches();
1035                 __merge_breaks();
1036                 pop_expression(&switch_expr_stack);
1037                 break;
1038         case STMT_CASE:
1039                 split_case(stmt);
1040                 break;
1041         case STMT_LABEL:
1042                 __split_label_stmt(stmt);
1043                 __split_stmt(stmt->label_statement);
1044                 break;
1045         case STMT_GOTO:
1046                 __split_expr(stmt->goto_expression);
1047                 if (stmt->goto_label && stmt->goto_label->type == SYM_NODE) {
1048                         if (!strcmp(stmt->goto_label->ident->name, "break")) {
1049                                 __process_breaks();
1050                         } else if (!strcmp(stmt->goto_label->ident->name,
1051                                            "continue")) {
1052                                 __process_continues();
1053                         }
1054                 } else if (stmt->goto_label &&
1055                            stmt->goto_label->type == SYM_LABEL &&
1056                            stmt->goto_label->ident) {
1057                         __save_gotos(stmt->goto_label->ident->name);
1058                 }
1059                 nullify_path();
1060                 if (is_last_stmt(stmt))
1061                         handle_backward_goto(stmt);
1062                 break;
1063         case STMT_NONE:
1064                 break;
1065         case STMT_ASM:
1066                 find_asm_gotos(stmt);
1067                 __pass_to_client(stmt, ASM_HOOK);
1068                 __split_expr(stmt->asm_string);
1069                 split_asm_constraints(stmt->asm_outputs);
1070                 split_asm_constraints(stmt->asm_inputs);
1071                 split_asm_constraints(stmt->asm_clobbers);
1072                 break;
1073         case STMT_CONTEXT:
1074                 break;
1075         case STMT_RANGE:
1076                 __split_expr(stmt->range_expression);
1077                 __split_expr(stmt->range_low);
1078                 __split_expr(stmt->range_high);
1079                 break;
1080         }
1081         __pass_to_client(stmt, STMT_HOOK_AFTER);
1082 out:
1083         __process_post_op_stack();
1084 }
1085
1086 static void split_expr_list(struct expression_list *expr_list, struct expression *parent)
1087 {
1088         struct expression *expr;
1089
1090         FOR_EACH_PTR(expr_list, expr) {
1091                 set_parent_expr(expr, parent);
1092                 __split_expr(expr);
1093                 __process_post_op_stack();
1094         } END_FOR_EACH_PTR(expr);
1095 }
1096
1097 static void split_sym(struct symbol *sym)
1098 {
1099         if (!sym)
1100                 return;
1101         if (!(sym->namespace & NS_SYMBOL))
1102                 return;
1103
1104         __split_stmt(sym->stmt);
1105         __split_expr(sym->array_size);
1106         split_symlist(sym->arguments);
1107         split_symlist(sym->symbol_list);
1108         __split_stmt(sym->inline_stmt);
1109         split_symlist(sym->inline_symbol_list);
1110 }
1111
1112 static void split_symlist(struct symbol_list *sym_list)
1113 {
1114         struct symbol *sym;
1115
1116         FOR_EACH_PTR(sym_list, sym) {
1117                 split_sym(sym);
1118         } END_FOR_EACH_PTR(sym);
1119 }
1120
1121 typedef void (fake_cb)(struct expression *expr);
1122
1123 static int member_to_number(struct expression *expr, struct ident *member)
1124 {
1125         struct symbol *type, *tmp;
1126         char *name;
1127         int i;
1128
1129         if (!member)
1130                 return -1;
1131         name = member->name;
1132
1133         type = get_type(expr);
1134         if (!type || type->type != SYM_STRUCT)
1135                 return -1;
1136
1137         i = -1;
1138         FOR_EACH_PTR(type->symbol_list, tmp) {
1139                 i++;
1140                 if (!tmp->ident)
1141                         continue;
1142                 if (strcmp(name, tmp->ident->name) == 0)
1143                         return i;
1144         } END_FOR_EACH_PTR(tmp);
1145         return -1;
1146 }
1147
1148 static struct ident *number_to_member(struct expression *expr, int num)
1149 {
1150         struct symbol *type, *member;
1151         int i = 0;
1152
1153         type = get_type(expr);
1154         if (!type || type->type != SYM_STRUCT)
1155                 return NULL;
1156
1157         FOR_EACH_PTR(type->symbol_list, member) {
1158                 if (i == num)
1159                         return member->ident;
1160                 i++;
1161         } END_FOR_EACH_PTR(member);
1162         return NULL;
1163 }
1164
1165 static void fake_element_assigns_helper(struct expression *array, struct expression_list *expr_list, fake_cb *fake_cb);
1166
1167 struct member_set {
1168         struct ident *ident;
1169         int set;
1170 };
1171
1172 static struct member_set *alloc_member_set(struct symbol *type)
1173 {
1174         struct member_set *member_set;
1175         struct symbol *member;
1176         int member_count;
1177         int member_idx;
1178
1179         member_count = ptr_list_size((struct ptr_list *)type->symbol_list);
1180         member_set = malloc(member_count * sizeof(*member_set));
1181         member_idx = 0;
1182         FOR_EACH_PTR(type->symbol_list, member) {
1183                 member_set[member_idx].ident = member->ident;
1184                 member_set[member_idx].set = 0;
1185                 member_idx++;
1186         } END_FOR_EACH_PTR(member);
1187
1188         return member_set;
1189 }
1190
1191 static void mark_member_as_set(struct symbol *type, struct member_set *member_set, struct ident *ident)
1192 {
1193         int member_count = ptr_list_size((struct ptr_list *)type->symbol_list);
1194         int i;
1195
1196         for (i = 0; i < member_count; i++) {
1197                 if (member_set[i].ident == ident) {
1198                         member_set[i].set = 1;
1199                         return;
1200                 }
1201         }
1202 //      crap.  this is buggy.
1203 //      sm_msg("internal smatch error in initializer %s.%s", type->ident->name, ident->name);
1204 }
1205
1206 static void set_inner_struct_members(struct expression *expr, struct symbol *member)
1207 {
1208         struct expression *edge_member, *assign;
1209         struct symbol *base = get_real_base_type(member);
1210         struct symbol *tmp;
1211
1212         if (member->ident)
1213                 expr = member_expression(expr, '.', member->ident);
1214
1215         FOR_EACH_PTR(base->symbol_list, tmp) {
1216                 struct symbol *type;
1217
1218                 type = get_real_base_type(tmp);
1219                 if (!type)
1220                         continue;
1221
1222                 if (tmp->ident) {
1223                         edge_member = member_expression(expr, '.', tmp->ident);
1224                         if (get_state_expr(SMATCH_EXTRA, edge_member))
1225                                 continue;
1226                 }
1227
1228                 if (type->type == SYM_UNION || type->type == SYM_STRUCT) {
1229                         set_inner_struct_members(expr, tmp);
1230                         continue;
1231                 }
1232
1233                 if (!tmp->ident)
1234                         continue;
1235
1236                 assign = assign_expression(edge_member, zero_expr());
1237                 __split_expr(assign);
1238         } END_FOR_EACH_PTR(tmp);
1239
1240
1241 }
1242
1243 static void set_unset_to_zero(struct symbol *type, struct expression *expr)
1244 {
1245         struct symbol *tmp;
1246         struct expression *member = NULL;
1247         struct expression *assign;
1248         int op = '*';
1249
1250         if (expr->type == EXPR_PREOP && expr->op == '&') {
1251                 expr = strip_expr(expr->unop);
1252                 op = '.';
1253         }
1254
1255         FOR_EACH_PTR(type->symbol_list, tmp) {
1256                 type = get_real_base_type(tmp);
1257                 if (!type)
1258                         continue;
1259
1260                 if (tmp->ident) {
1261                         member = member_expression(expr, op, tmp->ident);
1262                         if (get_state_expr(SMATCH_EXTRA, member))
1263                                 continue;
1264                 }
1265
1266                 if (type->type == SYM_UNION || type->type == SYM_STRUCT) {
1267                         set_inner_struct_members(expr, tmp);
1268                         continue;
1269                 }
1270                 if (type->type == SYM_ARRAY)
1271                         continue;
1272                 if (!tmp->ident)
1273                         continue;
1274
1275                 assign = assign_expression(member, zero_expr());
1276                 __split_expr(assign);
1277         } END_FOR_EACH_PTR(tmp);
1278 }
1279
1280 static void fake_member_assigns_helper(struct expression *symbol, struct expression_list *members, fake_cb *fake_cb)
1281 {
1282         struct expression *deref, *assign, *tmp;
1283         struct symbol *struct_type, *type;
1284         struct ident *member;
1285         int member_idx;
1286         struct member_set *member_set;
1287
1288         struct_type = get_type(symbol);
1289         if (!struct_type ||
1290             (struct_type->type != SYM_STRUCT && struct_type->type != SYM_UNION))
1291                 return;
1292
1293         member_set = alloc_member_set(struct_type);
1294
1295         member_idx = 0;
1296         FOR_EACH_PTR(members, tmp) {
1297                 member = number_to_member(symbol, member_idx);
1298                 while (tmp->type == EXPR_IDENTIFIER) {
1299                         member = tmp->expr_ident;
1300                         member_idx = member_to_number(symbol, member);
1301                         tmp = tmp->ident_expression;
1302                 }
1303                 mark_member_as_set(struct_type, member_set, member);
1304                 member_idx++;
1305                 deref = member_expression(symbol, '.', member);
1306                 if (tmp->type == EXPR_INITIALIZER) {
1307                         type = get_type(deref);
1308                         if (type && type->type == SYM_ARRAY)
1309                                 fake_element_assigns_helper(deref, tmp->expr_list, fake_cb);
1310                         else
1311                                 fake_member_assigns_helper(deref, tmp->expr_list, fake_cb);
1312                 } else {
1313                         assign = assign_expression(deref, tmp);
1314                         fake_cb(assign);
1315                 }
1316         } END_FOR_EACH_PTR(tmp);
1317
1318         set_unset_to_zero(struct_type, symbol);
1319 }
1320
1321 static void fake_member_assigns(struct symbol *sym, fake_cb *fake_cb)
1322 {
1323         fake_member_assigns_helper(symbol_expression(sym),
1324                                    sym->initializer->expr_list, fake_cb);
1325 }
1326
1327 static void fake_element_assigns_helper(struct expression *array, struct expression_list *expr_list, fake_cb *fake_cb)
1328 {
1329         struct expression *offset, *binop, *assign, *tmp;
1330         struct symbol *type;
1331         int idx;
1332
1333         if (ptr_list_size((struct ptr_list *)expr_list) > 1000)
1334                 return;
1335
1336         idx = 0;
1337         FOR_EACH_PTR(expr_list, tmp) {
1338                 if (tmp->type == EXPR_INDEX) {
1339                         if (tmp->idx_from != tmp->idx_to)
1340                                 return;
1341                         idx = tmp->idx_from;
1342                         if (!tmp->idx_expression)
1343                                 goto next;
1344                         tmp = tmp->idx_expression;
1345                 }
1346                 offset = value_expr(idx);
1347                 binop = array_element_expression(array, offset);
1348                 if (tmp->type == EXPR_INITIALIZER) {
1349                         type = get_type(binop);
1350                         if (type && type->type == SYM_ARRAY)
1351                                 fake_element_assigns_helper(binop, tmp->expr_list, fake_cb);
1352                         else
1353                                 fake_member_assigns_helper(binop, tmp->expr_list, fake_cb);
1354                 } else {
1355                         assign = assign_expression(binop, tmp);
1356                         fake_cb(assign);
1357                 }
1358 next:
1359                 idx++;
1360         } END_FOR_EACH_PTR(tmp);
1361 }
1362
1363 static void fake_element_assigns(struct symbol *sym, fake_cb *fake_cb)
1364 {
1365         fake_element_assigns_helper(symbol_expression(sym), sym->initializer->expr_list, fake_cb);
1366 }
1367
1368 static void fake_assign_expr(struct symbol *sym)
1369 {
1370         struct expression *assign, *symbol;
1371
1372         symbol = symbol_expression(sym);
1373         assign = assign_expression(symbol, sym->initializer);
1374         __split_expr(assign);
1375 }
1376
1377 static void call_split_expr(struct expression *expr)
1378 {
1379         __split_expr(expr);
1380 }
1381
1382 static void do_initializer_stuff(struct symbol *sym)
1383 {
1384         if (!sym->initializer)
1385                 return;
1386
1387         if (sym->initializer->type == EXPR_INITIALIZER) {
1388                 if (get_real_base_type(sym)->type == SYM_ARRAY)
1389                         fake_element_assigns(sym, call_split_expr);
1390                 else
1391                         fake_member_assigns(sym, call_split_expr);
1392         } else {
1393                 fake_assign_expr(sym);
1394         }
1395 }
1396
1397 static void split_declaration(struct symbol_list *sym_list)
1398 {
1399         struct symbol *sym;
1400
1401         FOR_EACH_PTR(sym_list, sym) {
1402                 __pass_to_client(sym, DECLARATION_HOOK);
1403                 do_initializer_stuff(sym);
1404                 split_sym(sym);
1405         } END_FOR_EACH_PTR(sym);
1406 }
1407
1408 static void call_global_assign_hooks(struct expression *assign)
1409 {
1410         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1411 }
1412
1413 static void fake_global_assign(struct symbol *sym)
1414 {
1415         struct expression *assign, *symbol;
1416
1417         if (get_real_base_type(sym)->type == SYM_ARRAY) {
1418                 if (sym->initializer && sym->initializer->type == EXPR_INITIALIZER) {
1419                         fake_element_assigns(sym, call_global_assign_hooks);
1420                 } else if (sym->initializer) {
1421                         symbol = symbol_expression(sym);
1422                         assign = assign_expression(symbol, sym->initializer);
1423                         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1424                 } else {
1425                         fake_element_assigns_helper(symbol_expression(sym), NULL, call_global_assign_hooks);
1426                 }
1427         } else if (get_real_base_type(sym)->type == SYM_STRUCT) {
1428                 if (sym->initializer && sym->initializer->type == EXPR_INITIALIZER) {
1429                         fake_member_assigns(sym, call_global_assign_hooks);
1430                 } else if (sym->initializer) {
1431                         symbol = symbol_expression(sym);
1432                         assign = assign_expression(symbol, sym->initializer);
1433                         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1434                 } else {
1435                         fake_member_assigns_helper(symbol_expression(sym), NULL, call_global_assign_hooks);
1436                 }
1437         } else {
1438                 symbol = symbol_expression(sym);
1439                 if (sym->initializer)
1440                         assign = assign_expression(symbol, sym->initializer);
1441                 else
1442                         assign = assign_expression(symbol, zero_expr());
1443                 __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1444         }
1445 }
1446
1447 static void start_function_definition(struct symbol *sym)
1448 {
1449         __in_function_def = 1;
1450         __pass_to_client(sym, FUNC_DEF_HOOK);
1451         __in_function_def = 0;
1452         __pass_to_client(sym, AFTER_DEF_HOOK);
1453
1454 }
1455
1456 static void split_function(struct symbol *sym)
1457 {
1458         struct symbol *base_type = get_base_type(sym);
1459
1460         if (!base_type->stmt && !base_type->inline_stmt)
1461                 return;
1462
1463         gettimeofday(&fn_start_time, NULL);
1464         cur_func_sym = sym;
1465         if (sym->ident)
1466                 cur_func = sym->ident->name;
1467         set_position(sym->pos);
1468         loop_count = 0;
1469         last_goto_statement_handled = 0;
1470         sm_debug("new function:  %s\n", cur_func);
1471         __stree_id = 0;
1472         if (option_two_passes) {
1473                 __unnullify_path();
1474                 loop_num = 0;
1475                 final_pass = 0;
1476                 start_function_definition(sym);
1477                 __split_stmt(base_type->stmt);
1478                 __split_stmt(base_type->inline_stmt);
1479                 nullify_path();
1480         }
1481         __unnullify_path();
1482         loop_num = 0;
1483         final_pass = 1;
1484         start_function_definition(sym);
1485         __split_stmt(base_type->stmt);
1486         __split_stmt(base_type->inline_stmt);
1487         __pass_to_client(sym, END_FUNC_HOOK);
1488         __pass_to_client(sym, AFTER_FUNC_HOOK);
1489
1490         clear_all_states();
1491         cur_func_sym = NULL;
1492         cur_func = NULL;
1493         free_data_info_allocs();
1494         free_expression_stack(&switch_expr_stack);
1495         __free_ptr_list((struct ptr_list **)&big_statement_stack);
1496         __bail_on_rest_of_function = 0;
1497 }
1498
1499 static void parse_inline(struct expression *call)
1500 {
1501         struct symbol *base_type;
1502         int loop_num_bak = loop_num;
1503         int loop_count_bak = loop_count;
1504         int final_pass_bak = final_pass;
1505         char *cur_func_bak = cur_func;
1506         struct statement_list *big_statement_stack_bak = big_statement_stack;
1507         struct expression_list *big_expression_stack_bak = big_expression_stack;
1508         struct expression_list *big_condition_stack_bak = big_condition_stack;
1509         struct expression_list *switch_expr_stack_bak = switch_expr_stack;
1510         struct symbol *cur_func_sym_bak = cur_func_sym;
1511
1512         __pass_to_client(call, INLINE_FN_START);
1513         final_pass = 0;  /* don't print anything */
1514         __inline_fn = call;
1515
1516         base_type = get_base_type(call->fn->symbol);
1517         cur_func_sym = call->fn->symbol;
1518         if (call->fn->symbol->ident)
1519                 cur_func = call->fn->symbol->ident->name;
1520         else
1521                 cur_func = NULL;
1522         set_position(call->fn->symbol->pos);
1523
1524         save_all_states();
1525         big_statement_stack = NULL;
1526         big_expression_stack = NULL;
1527         big_condition_stack = NULL;
1528         switch_expr_stack = NULL;
1529
1530         sm_debug("inline function:  %s\n", cur_func);
1531         __unnullify_path();
1532         loop_num = 0;
1533         start_function_definition(call->fn->symbol);
1534         __split_stmt(base_type->stmt);
1535         __split_stmt(base_type->inline_stmt);
1536         __pass_to_client(call->fn->symbol, END_FUNC_HOOK);
1537         __pass_to_client(call->fn->symbol, AFTER_FUNC_HOOK);
1538
1539         free_expression_stack(&switch_expr_stack);
1540         __free_ptr_list((struct ptr_list **)&big_statement_stack);
1541         nullify_path();
1542         free_goto_stack();
1543
1544         loop_num = loop_num_bak;
1545         loop_count = loop_count_bak;
1546         final_pass = final_pass_bak;
1547         cur_func_sym = cur_func_sym_bak;
1548         cur_func = cur_func_bak;
1549         big_statement_stack = big_statement_stack_bak;
1550         big_expression_stack = big_expression_stack_bak;
1551         big_condition_stack = big_condition_stack_bak;
1552         switch_expr_stack = switch_expr_stack_bak;
1553
1554         restore_all_states();
1555         set_position(call->pos);
1556         __inline_fn = NULL;
1557         __pass_to_client(call, INLINE_FN_END);
1558 }
1559
1560 static struct symbol_list *inlines_called;
1561 static void add_inline_function(struct symbol *sym)
1562 {
1563         static struct symbol_list *already_added;
1564         struct symbol *tmp;
1565
1566         FOR_EACH_PTR(already_added, tmp) {
1567                 if (tmp == sym)
1568                         return;
1569         } END_FOR_EACH_PTR(tmp);
1570
1571         add_ptr_list(&already_added, sym);
1572         add_ptr_list(&inlines_called, sym);
1573 }
1574
1575 static void process_inlines(void)
1576 {
1577         struct symbol *tmp;
1578
1579         FOR_EACH_PTR(inlines_called, tmp) {
1580                 split_function(tmp);
1581         } END_FOR_EACH_PTR(tmp);
1582         free_ptr_list(&inlines_called);
1583 }
1584
1585 static struct symbol *get_last_scoped_symbol(struct symbol_list *big_list, int use_static)
1586 {
1587         struct symbol *sym;
1588
1589         FOR_EACH_PTR_REVERSE(big_list, sym) {
1590                 if (!sym->scope)
1591                         continue;
1592                 if (use_static && sym->ctype.modifiers & MOD_STATIC)
1593                         return sym;
1594                 if (!use_static && !(sym->ctype.modifiers & MOD_STATIC))
1595                         return sym;
1596         } END_FOR_EACH_PTR_REVERSE(sym);
1597
1598         return NULL;
1599 }
1600
1601 static void split_inlines_in_scope(struct symbol *sym)
1602 {
1603         struct symbol *base;
1604         struct symbol_list *scope_list;
1605         int stream;
1606
1607         scope_list = sym->scope->symbols;
1608         stream = sym->pos.stream;
1609
1610         /* find the last static symbol in the file */
1611         FOR_EACH_PTR_REVERSE(scope_list, sym) {
1612                 if (sym->pos.stream != stream)
1613                         continue;
1614                 if (sym->type != SYM_NODE)
1615                         continue;
1616                 base = get_base_type(sym);
1617                 if (!base)
1618                         continue;
1619                 if (base->type != SYM_FN)
1620                         continue;
1621                 if (!base->inline_stmt)
1622                         continue;
1623                 add_inline_function(sym);
1624         } END_FOR_EACH_PTR_REVERSE(sym);
1625
1626         process_inlines();
1627 }
1628
1629 static void split_inlines(struct symbol_list *sym_list)
1630 {
1631         struct symbol *sym;
1632
1633         sym = get_last_scoped_symbol(sym_list, 0);
1634         if (sym)
1635                 split_inlines_in_scope(sym);
1636         sym = get_last_scoped_symbol(sym_list, 1);
1637         if (sym)
1638                 split_inlines_in_scope(sym);
1639 }
1640
1641 static struct stree *clone_estates_perm(struct stree *orig)
1642 {
1643         struct stree *ret = NULL;
1644         struct sm_state *tmp;
1645
1646         FOR_EACH_SM(orig, tmp) {
1647                 set_state_stree_perm(&ret, tmp->owner, tmp->name, tmp->sym, clone_estate_perm(tmp->state));
1648         } END_FOR_EACH_SM(tmp);
1649
1650         return ret;
1651 }
1652
1653 struct position last_pos;
1654 static void split_functions(struct symbol_list *sym_list)
1655 {
1656         struct symbol *sym;
1657
1658         __unnullify_path();
1659         FOR_EACH_PTR(sym_list, sym) {
1660                 set_position(sym->pos);
1661                 if (sym->type != SYM_NODE || get_base_type(sym)->type != SYM_FN) {
1662                         __pass_to_client(sym, BASE_HOOK);
1663                         fake_global_assign(sym);
1664                 }
1665         } END_FOR_EACH_PTR(sym);
1666         global_states = clone_estates_perm(get_all_states_stree(SMATCH_EXTRA));
1667         nullify_path();
1668
1669         FOR_EACH_PTR(sym_list, sym) {
1670                 set_position(sym->pos);
1671                 if (sym->type == SYM_NODE && get_base_type(sym)->type == SYM_FN) {
1672                         split_function(sym);
1673                         process_inlines();
1674                 }
1675                 last_pos = sym->pos;
1676         } END_FOR_EACH_PTR(sym);
1677         split_inlines(sym_list);
1678         __pass_to_client(sym_list, END_FILE_HOOK);
1679 }
1680
1681 void smatch(int argc, char **argv)
1682 {
1683         struct string_list *filelist = NULL;
1684         struct symbol_list *sym_list;
1685         struct timeval stop, start;
1686
1687         gettimeofday(&start, NULL);
1688
1689         if (argc < 2) {
1690                 printf("Usage:  smatch [--debug] <filename.c>\n");
1691                 exit(1);
1692         }
1693         sparse_initialize(argc, argv, &filelist);
1694         set_valid_ptr_max();
1695         FOR_EACH_PTR_NOTAG(filelist, base_file) {
1696                 if (option_file_output) {
1697                         char buf[256];
1698
1699                         snprintf(buf, sizeof(buf), "%s.smatch", base_file);
1700                         sm_outfd = fopen(buf, "w");
1701                         if (!sm_outfd) {
1702                                 printf("Error:  Cannot open %s\n", base_file);
1703                                 exit(1);
1704                         }
1705                 }
1706                 sym_list = sparse_keep_tokens(base_file);
1707                 split_functions(sym_list);
1708         } END_FOR_EACH_PTR_NOTAG(base_file);
1709
1710         gettimeofday(&stop, NULL);
1711
1712         set_position(last_pos);
1713         if (option_time)
1714                 sm_msg("time: %lu", stop.tv_sec - start.tv_sec);
1715 }