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