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                         if (!is_fake_call(tmp))
 393                                 __pass_to_client(tmp, FUNCTION_CALL_HOOK_AFTER);
 394                 }
 395                 if (get_macro_name(tmp->pos) &&
 396                     get_macro_name(expr->pos) != get_macro_name(tmp->pos))
 397                         __pass_to_client(expr, MACRO_ASSIGNMENT_HOOK);
 398                 __split_expr(expr->left);
 399                 break;
 400         }
 401         case EXPR_DEREF:
 402                 set_parent_expr(expr->deref, expr);
 403
 404                 __pass_to_client(expr, DEREF_HOOK);
 405                 __split_expr(expr->deref);
 406                 break;
 407         case EXPR_SLICE:
 408                 set_parent_expr(expr->base, expr);
 409
 410                 __split_expr(expr->base);
 411                 break;
 412         case EXPR_CAST:
 413         case EXPR_FORCE_CAST:
 414                 set_parent_expr(expr->cast_expression, expr);
 415
 416                 __pass_to_client(expr, CAST_HOOK);
 417                 __split_expr(expr->cast_expression);
 418                 break;
 419         case EXPR_SIZEOF:
 420                 if (expr->cast_expression)
 421                         __pass_to_client(strip_parens(expr->cast_expression),
 422                                          SIZEOF_HOOK);
 423                 break;
 424         case EXPR_OFFSETOF:
 425         case EXPR_ALIGNOF:
 426                 evaluate_expression(expr);
 427                 break;
 428         case EXPR_CONDITIONAL:
 429         case EXPR_SELECT:
 430                 set_parent_expr(expr->conditional, expr);
 431                 set_parent_expr(expr->cond_true, expr);
 432                 set_parent_expr(expr->cond_false, expr);
 433
 434                 if (known_condition_true(expr->conditional)) {
 435                         __split_expr(expr->cond_true);
 436                         break;
 437                 }
 438                 if (known_condition_false(expr->conditional)) {
 439                         __split_expr(expr->cond_false);
 440                         break;
 441                 }
 442                 __pass_to_client(expr, SELECT_HOOK);
 443                 __split_whole_condition(expr->conditional);
 444                 __split_expr(expr->cond_true);
 445                 __push_true_states();
 446                 __use_false_states();
 447                 __split_expr(expr->cond_false);
 448                 __merge_true_states();
 449                 break;
 450         case EXPR_CALL:
 451                 set_parent_expr(expr->fn, expr);
 452
 453                 if (sym_name_is("__builtin_constant_p", expr->fn))
 454                         break;
 455                 split_expr_list(expr->args, expr);
 456                 __split_expr(expr->fn);
 457                 if (is_inline_func(expr->fn))
 458                         add_inline_function(expr->fn->symbol);
 459                 if (inlinable(expr->fn))
 460                         __inline_call = 1;
 461                 __process_post_op_stack();
 462                 __pass_to_client(expr, FUNCTION_CALL_HOOK);
 463                 __inline_call = 0;
 464                 if (inlinable(expr->fn)) {
 465                         parse_inline(expr);
 466                 }
 467                 __pass_to_client(expr, CALL_HOOK_AFTER_INLINE);
 468                 if (!is_assigned_call(expr))
 469                         __pass_to_client(expr, FUNCTION_CALL_HOOK_AFTER);
 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 void split_known_switch(struct statement *stmt, sval_t sval)
 701 {
 702         struct statement *tmp;
 703
 704         __split_expr(stmt->switch_expression);
 705
 706         push_expression(&switch_expr_stack, stmt->switch_expression);
 707         __save_switch_states(top_expression(switch_expr_stack));
 708         nullify_path();
 709         __push_default();
 710         __push_breaks();
 711
 712         stmt = stmt->switch_statement;
 713
 714         __push_scope_hooks();
 715         FOR_EACH_PTR(stmt->stmts, tmp) {
 716                 __smatch_lineno = tmp->pos.line;
 717                 if (is_case_val(tmp, sval)) {
 718                         __merge_switches(top_expression(switch_expr_stack),
 719                                          stmt->case_expression, stmt->case_to);
 720                         __pass_case_to_client(top_expression(switch_expr_stack),
 721                                               stmt->case_expression);
 722                 }
 723                 if (__path_is_null())
 724                         continue;
 725                 __split_stmt(tmp);
 726                 if (__path_is_null()) {
 727                         __set_default();
 728                         goto out;
 729                 }
 730         } END_FOR_EACH_PTR(tmp);
 731 out:
 732         __call_scope_hooks();
 733         if (!__pop_default())
 734                 __merge_switches(top_expression(switch_expr_stack),
 735                                  NULL, NULL);
 736         __discard_switches();
 737         __merge_breaks();
 738         pop_expression(&switch_expr_stack);
 739 }
 740
 741 static int taking_too_long(void)
 742 {
 743         int ms;
 744
 745         ms = ms_since(&fn_start_time);
 746         if (ms > 1000 * 60 * 5)  /* five minutes */
 747                 return 1;
 748         return 0;
 749 }
 750
 751 static int is_last_stmt(struct statement *cur_stmt)
 752 {
 753         struct symbol *fn = get_base_type(cur_func_sym);
 754         struct statement *stmt;
 755
 756         if (!fn)
 757                 return 0;
 758         stmt = fn->stmt;
 759         if (!stmt)
 760                 stmt = fn->inline_stmt;
 761         if (!stmt || stmt->type != STMT_COMPOUND)
 762                 return 0;
 763         stmt = last_ptr_list((struct ptr_list *)stmt->stmts);
 764         if (stmt && stmt->type == STMT_LABEL)
 765                 stmt = stmt->label_statement;
 766         if (stmt == cur_stmt)
 767                 return 1;
 768         return 0;
 769 }
 770
 771 static void handle_backward_goto(struct statement *goto_stmt)
 772 {
 773         const char *goto_name, *label_name;
 774         struct statement *func_stmt;
 775         struct symbol *base_type = get_base_type(cur_func_sym);
 776         struct statement *tmp;
 777         int found = 0;
 778
 779         if (!option_info)
 780                 return;
 781         if (last_goto_statement_handled)
 782                 return;
 783         last_goto_statement_handled = 1;
 784
 785         if (!goto_stmt->goto_label ||
 786             goto_stmt->goto_label->type != SYM_LABEL ||
 787             !goto_stmt->goto_label->ident)
 788                 return;
 789         goto_name = goto_stmt->goto_label->ident->name;
 790
 791         func_stmt = base_type->stmt;
 792         if (!func_stmt)
 793                 func_stmt = base_type->inline_stmt;
 794         if (!func_stmt)
 795                 return;
 796         if (func_stmt->type != STMT_COMPOUND)
 797                 return;
 798
 799         FOR_EACH_PTR(func_stmt->stmts, tmp) {
 800                 if (!found) {
 801                         if (tmp->type != STMT_LABEL)
 802                                 continue;
 803                         if (!tmp->label_identifier ||
 804                             tmp->label_identifier->type != SYM_LABEL ||
 805                             !tmp->label_identifier->ident)
 806                                 continue;
 807                         label_name = tmp->label_identifier->ident->name;
 808                         if (strcmp(goto_name, label_name) != 0)
 809                                 continue;
 810                         found = 1;
 811                 }
 812                 __split_stmt(tmp);
 813         } END_FOR_EACH_PTR(tmp);
 814 }
 815
 816 static void fake_a_return(void)
 817 {
 818         struct symbol *return_type;
 819
 820         nullify_path();
 821         __unnullify_path();
 822
 823         return_type = get_real_base_type(cur_func_sym);
 824         return_type = get_real_base_type(return_type);
 825         if (return_type != &void_ctype) {
 826                 __pass_to_client(unknown_value_expression(NULL), RETURN_HOOK);
 827                 nullify_path();
 828         }
 829 }
 830
 831 static void split_compound(struct statement *stmt)
 832 {
 833         struct statement *prev = NULL;
 834         struct statement *cur = NULL;
 835         struct statement *next;
 836
 837         __push_scope_hooks();
 838
 839         FOR_EACH_PTR(stmt->stmts, next) {
 840                 /* just set them all ahead of time */
 841                 set_parent_stmt(next, stmt);
 842
 843                 if (cur) {
 844                         __prev_stmt = prev;
 845                         __next_stmt = next;
 846                         __cur_stmt = cur;
 847                         __split_stmt(cur);
 848                 }
 849                 prev = cur;
 850                 cur = next;
 851         } END_FOR_EACH_PTR(next);
 852         if (cur) {
 853                 __prev_stmt = prev;
 854                 __cur_stmt = cur;
 855                 __next_stmt = NULL;
 856                 __split_stmt(cur);
 857         }
 858
 859         __call_scope_hooks();
 860 }
 861
 862 void __split_label_stmt(struct statement *stmt)
 863 {
 864         if (stmt->label_identifier &&
 865             stmt->label_identifier->type == SYM_LABEL &&
 866             stmt->label_identifier->ident) {
 867                 loop_count |= 0x80000000;
 868                 __merge_gotos(stmt->label_identifier->ident->name);
 869         }
 870 }
 871
 872 void __split_stmt(struct statement *stmt)
 873 {
 874         sval_t sval;
 875
 876         if (!stmt)
 877                 goto out;
 878
 879         if (__bail_on_rest_of_function)
 880                 return;
 881
 882         if (out_of_memory() || taking_too_long()) {
 883
 884                 __bail_on_rest_of_function = 1;
 885                 sm_msg("Function too hairy.  Giving up.");
 886                 fake_a_return();
 887                 final_pass = 0;  /* turn off sm_msg() from here */
 888                 return;
 889         }
 890
 891         add_ptr_list(&big_statement_stack, stmt);
 892         free_expression_stack(&big_expression_stack);
 893         set_position(stmt->pos);
 894         __pass_to_client(stmt, STMT_HOOK);
 895
 896         switch (stmt->type) {
 897         case STMT_DECLARATION:
 898                 split_declaration(stmt->declaration);
 899                 break;
 900         case STMT_RETURN:
 901                 __split_expr(stmt->ret_value);
 902                 __pass_to_client(stmt->ret_value, RETURN_HOOK);
 903                 __process_post_op_stack();
 904                 nullify_path();
 905                 break;
 906         case STMT_EXPRESSION:
 907                 __split_expr(stmt->expression);
 908                 break;
 909         case STMT_COMPOUND:
 910                 split_compound(stmt);
 911                 break;
 912         case STMT_IF:
 913                 set_parent_stmt(stmt->if_true, stmt);
 914                 set_parent_stmt(stmt->if_false, stmt);
 915
 916                 if (known_condition_true(stmt->if_conditional)) {
 917                         __split_stmt(stmt->if_true);
 918                         break;
 919                 }
 920                 if (known_condition_false(stmt->if_conditional)) {
 921                         __split_stmt(stmt->if_false);
 922                         break;
 923                 }
 924                 __split_whole_condition(stmt->if_conditional);
 925                 __split_stmt(stmt->if_true);
 926                 if (empty_statement(stmt->if_true) &&
 927                         last_stmt_on_same_line() &&
 928                         !get_macro_name(stmt->if_true->pos))
 929                         sm_msg("warn: if();");
 930                 __push_true_states();
 931                 __use_false_states();
 932                 __split_stmt(stmt->if_false);
 933                 __merge_true_states();
 934                 break;
 935         case STMT_ITERATOR:
 936                 set_parent_stmt(stmt->iterator_pre_statement, stmt);
 937                 set_parent_stmt(stmt->iterator_statement, stmt);
 938                 set_parent_stmt(stmt->iterator_post_statement, stmt);
 939
 940                 if (stmt->iterator_pre_condition)
 941                         handle_pre_loop(stmt);
 942                 else if (stmt->iterator_post_condition)
 943                         handle_post_loop(stmt);
 944                 else {
 945                         // these are for(;;) type loops.
 946                         handle_pre_loop(stmt);
 947                 }
 948                 break;
 949         case STMT_SWITCH:
 950                 set_parent_stmt(stmt->switch_statement, stmt);
 951
 952                 if (get_value(stmt->switch_expression, &sval)) {
 953                         split_known_switch(stmt, sval);
 954                         break;
 955                 }
 956                 __split_expr(stmt->switch_expression);
 957                 push_expression(&switch_expr_stack, stmt->switch_expression);
 958                 __save_switch_states(top_expression(switch_expr_stack));
 959                 nullify_path();
 960                 __push_default();
 961                 __push_breaks();
 962                 __split_stmt(stmt->switch_statement);
 963                 if (!__pop_default())
 964                         __merge_switches(top_expression(switch_expr_stack),
 965                                       NULL, NULL);
 966                 __discard_switches();
 967                 __merge_breaks();
 968                 pop_expression(&switch_expr_stack);
 969                 break;
 970         case STMT_CASE:
 971                 __merge_switches(top_expression(switch_expr_stack),
 972                                       stmt->case_expression, stmt->case_to);
 973                 __pass_case_to_client(top_expression(switch_expr_stack),
 974                                       stmt->case_expression);
 975                 if (!stmt->case_expression)
 976                         __set_default();
 977                 __split_expr(stmt->case_expression);
 978                 __split_expr(stmt->case_to);
 979                 __split_stmt(stmt->case_statement);
 980                 break;
 981         case STMT_LABEL:
 982                 __split_label_stmt(stmt);
 983                 __split_stmt(stmt->label_statement);
 984                 break;
 985         case STMT_GOTO:
 986                 __split_expr(stmt->goto_expression);
 987                 if (stmt->goto_label && stmt->goto_label->type == SYM_NODE) {
 988                         if (!strcmp(stmt->goto_label->ident->name, "break")) {
 989                                 __process_breaks();
 990                         } else if (!strcmp(stmt->goto_label->ident->name,
 991                                            "continue")) {
 992                                 __process_continues();
 993                         }
 994                 } else if (stmt->goto_label &&
 995                            stmt->goto_label->type == SYM_LABEL &&
 996                            stmt->goto_label->ident) {
 997                         __save_gotos(stmt->goto_label->ident->name);
 998                 }
 999                 nullify_path();
1000                 if (is_last_stmt(stmt))
1001                         handle_backward_goto(stmt);
1002                 break;
1003         case STMT_NONE:
1004                 break;
1005         case STMT_ASM:
1006                 __pass_to_client(stmt, ASM_HOOK);
1007                 __split_expr(stmt->asm_string);
1008                 split_asm_constraints(stmt->asm_outputs);
1009                 split_asm_constraints(stmt->asm_inputs);
1010                 split_asm_constraints(stmt->asm_clobbers);
1011                 break;
1012         case STMT_CONTEXT:
1013                 break;
1014         case STMT_RANGE:
1015                 __split_expr(stmt->range_expression);
1016                 __split_expr(stmt->range_low);
1017                 __split_expr(stmt->range_high);
1018                 break;
1019         }
1020         __pass_to_client(stmt, STMT_HOOK_AFTER);
1021 out:
1022         __process_post_op_stack();
1023 }
1024
1025 static void split_expr_list(struct expression_list *expr_list, struct expression *parent)
1026 {
1027         struct expression *expr;
1028
1029         FOR_EACH_PTR(expr_list, expr) {
1030                 set_parent_expr(expr, parent);
1031                 __split_expr(expr);
1032                 __process_post_op_stack();
1033         } END_FOR_EACH_PTR(expr);
1034 }
1035
1036 static void split_sym(struct symbol *sym)
1037 {
1038         if (!sym)
1039                 return;
1040         if (!(sym->namespace & NS_SYMBOL))
1041                 return;
1042
1043         __split_stmt(sym->stmt);
1044         __split_expr(sym->array_size);
1045         split_symlist(sym->arguments);
1046         split_symlist(sym->symbol_list);
1047         __split_stmt(sym->inline_stmt);
1048         split_symlist(sym->inline_symbol_list);
1049 }
1050
1051 static void split_symlist(struct symbol_list *sym_list)
1052 {
1053         struct symbol *sym;
1054
1055         FOR_EACH_PTR(sym_list, sym) {
1056                 split_sym(sym);
1057         } END_FOR_EACH_PTR(sym);
1058 }
1059
1060 typedef void (fake_cb)(struct expression *expr);
1061
1062 static int member_to_number(struct expression *expr, struct ident *member)
1063 {
1064         struct symbol *type, *tmp;
1065         char *name;
1066         int i;
1067
1068         if (!member)
1069                 return -1;
1070         name = member->name;
1071
1072         type = get_type(expr);
1073         if (!type || type->type != SYM_STRUCT)
1074                 return -1;
1075
1076         i = -1;
1077         FOR_EACH_PTR(type->symbol_list, tmp) {
1078                 i++;
1079                 if (!tmp->ident)
1080                         continue;
1081                 if (strcmp(name, tmp->ident->name) == 0)
1082                         return i;
1083         } END_FOR_EACH_PTR(tmp);
1084         return -1;
1085 }
1086
1087 static struct ident *number_to_member(struct expression *expr, int num)
1088 {
1089         struct symbol *type, *member;
1090         int i = 0;
1091
1092         type = get_type(expr);
1093         if (!type || type->type != SYM_STRUCT)
1094                 return NULL;
1095
1096         FOR_EACH_PTR(type->symbol_list, member) {
1097                 if (i == num)
1098                         return member->ident;
1099                 i++;
1100         } END_FOR_EACH_PTR(member);
1101         return NULL;
1102 }
1103
1104 static void fake_element_assigns_helper(struct expression *array, struct expression_list *expr_list, fake_cb *fake_cb);
1105
1106 struct member_set {
1107         struct ident *ident;
1108         int set;
1109 };
1110
1111 static struct member_set *alloc_member_set(struct symbol *type)
1112 {
1113         struct member_set *member_set;
1114         struct symbol *member;
1115         int member_count;
1116         int member_idx;
1117
1118         member_count = ptr_list_size((struct ptr_list *)type->symbol_list);
1119         member_set = malloc(member_count * sizeof(*member_set));
1120         member_idx = 0;
1121         FOR_EACH_PTR(type->symbol_list, member) {
1122                 member_set[member_idx].ident = member->ident;
1123                 member_set[member_idx].set = 0;
1124                 member_idx++;
1125         } END_FOR_EACH_PTR(member);
1126
1127         return member_set;
1128 }
1129
1130 static void mark_member_as_set(struct symbol *type, struct member_set *member_set, struct ident *ident)
1131 {
1132         int member_count = ptr_list_size((struct ptr_list *)type->symbol_list);
1133         int i;
1134
1135         for (i = 0; i < member_count; i++) {
1136                 if (member_set[i].ident == ident) {
1137                         member_set[i].set = 1;
1138                         return;
1139                 }
1140         }
1141 //      crap.  this is buggy.
1142 //      sm_msg("internal smatch error in initializer %s.%s", type->ident->name, ident->name);
1143 }
1144
1145 static void set_inner_struct_members(struct expression *expr, struct symbol *member)
1146 {
1147         struct expression *edge_member, *assign;
1148         struct symbol *base = get_real_base_type(member);
1149         struct symbol *tmp;
1150
1151         if (member->ident)
1152                 expr = member_expression(expr, '.', member->ident);
1153
1154         FOR_EACH_PTR(base->symbol_list, tmp) {
1155                 struct symbol *type;
1156
1157                 type = get_real_base_type(tmp);
1158                 if (!type)
1159                         continue;
1160
1161                 if (tmp->ident) {
1162                         edge_member = member_expression(expr, '.', tmp->ident);
1163                         if (get_state_expr(SMATCH_EXTRA, edge_member))
1164                                 continue;
1165                 }
1166
1167                 if (type->type == SYM_UNION || type->type == SYM_STRUCT) {
1168                         set_inner_struct_members(expr, tmp);
1169                         continue;
1170                 }
1171
1172                 if (!tmp->ident)
1173                         continue;
1174
1175                 assign = assign_expression(edge_member, zero_expr());
1176                 __split_expr(assign);
1177         } END_FOR_EACH_PTR(tmp);
1178
1179
1180 }
1181
1182 static void set_unset_to_zero(struct symbol *type, struct expression *expr)
1183 {
1184         struct symbol *tmp;
1185         struct expression *member = NULL;
1186         struct expression *assign;
1187         int op = '*';
1188
1189         if (expr->type == EXPR_PREOP && expr->op == '&') {
1190                 expr = strip_expr(expr->unop);
1191                 op = '.';
1192         }
1193
1194         FOR_EACH_PTR(type->symbol_list, tmp) {
1195                 type = get_real_base_type(tmp);
1196                 if (!type)
1197                         continue;
1198
1199                 if (tmp->ident) {
1200                         member = member_expression(expr, op, tmp->ident);
1201                         if (get_state_expr(SMATCH_EXTRA, member))
1202                                 continue;
1203                 }
1204
1205                 if (type->type == SYM_UNION || type->type == SYM_STRUCT) {
1206                         set_inner_struct_members(expr, tmp);
1207                         continue;
1208                 }
1209                 if (type->type == SYM_ARRAY)
1210                         continue;
1211                 if (!tmp->ident)
1212                         continue;
1213
1214                 assign = assign_expression(member, zero_expr());
1215                 __split_expr(assign);
1216         } END_FOR_EACH_PTR(tmp);
1217 }
1218
1219 static void fake_member_assigns_helper(struct expression *symbol, struct expression_list *members, fake_cb *fake_cb)
1220 {
1221         struct expression *deref, *assign, *tmp;
1222         struct symbol *struct_type, *type;
1223         struct ident *member;
1224         int member_idx;
1225         struct member_set *member_set;
1226
1227         struct_type = get_type(symbol);
1228         if (!struct_type ||
1229             (struct_type->type != SYM_STRUCT && struct_type->type != SYM_UNION))
1230                 return;
1231
1232         member_set = alloc_member_set(struct_type);
1233
1234         member_idx = 0;
1235         FOR_EACH_PTR(members, tmp) {
1236                 member = number_to_member(symbol, member_idx);
1237                 while (tmp->type == EXPR_IDENTIFIER) {
1238                         member = tmp->expr_ident;
1239                         member_idx = member_to_number(symbol, member);
1240                         tmp = tmp->ident_expression;
1241                 }
1242                 mark_member_as_set(struct_type, member_set, member);
1243                 member_idx++;
1244                 deref = member_expression(symbol, '.', member);
1245                 if (tmp->type == EXPR_INITIALIZER) {
1246                         type = get_type(deref);
1247                         if (type && type->type == SYM_ARRAY)
1248                                 fake_element_assigns_helper(deref, tmp->expr_list, fake_cb);
1249                         else
1250                                 fake_member_assigns_helper(deref, tmp->expr_list, fake_cb);
1251                 } else {
1252                         assign = assign_expression(deref, tmp);
1253                         fake_cb(assign);
1254                 }
1255         } END_FOR_EACH_PTR(tmp);
1256
1257         set_unset_to_zero(struct_type, symbol);
1258 }
1259
1260 static void fake_member_assigns(struct symbol *sym, fake_cb *fake_cb)
1261 {
1262         fake_member_assigns_helper(symbol_expression(sym),
1263                                    sym->initializer->expr_list, fake_cb);
1264 }
1265
1266 static void fake_element_assigns_helper(struct expression *array, struct expression_list *expr_list, fake_cb *fake_cb)
1267 {
1268         struct expression *offset, *binop, *assign, *tmp;
1269         struct symbol *type;
1270         int idx;
1271
1272         if (ptr_list_size((struct ptr_list *)expr_list) > 1000)
1273                 return;
1274
1275         idx = 0;
1276         FOR_EACH_PTR(expr_list, tmp) {
1277                 if (tmp->type == EXPR_INDEX) {
1278                         if (tmp->idx_from != tmp->idx_to)
1279                                 return;
1280                         idx = tmp->idx_from;
1281                         if (!tmp->idx_expression)
1282                                 goto next;
1283                         tmp = tmp->idx_expression;
1284                 }
1285                 offset = value_expr(idx);
1286                 binop = array_element_expression(array, offset);
1287                 if (tmp->type == EXPR_INITIALIZER) {
1288                         type = get_type(binop);
1289                         if (type && type->type == SYM_ARRAY)
1290                                 fake_element_assigns_helper(binop, tmp->expr_list, fake_cb);
1291                         else
1292                                 fake_member_assigns_helper(binop, tmp->expr_list, fake_cb);
1293                 } else {
1294                         assign = assign_expression(binop, tmp);
1295                         fake_cb(assign);
1296                 }
1297 next:
1298                 idx++;
1299         } END_FOR_EACH_PTR(tmp);
1300 }
1301
1302 static void fake_element_assigns(struct symbol *sym, fake_cb *fake_cb)
1303 {
1304         fake_element_assigns_helper(symbol_expression(sym), sym->initializer->expr_list, fake_cb);
1305 }
1306
1307 static void fake_assign_expr(struct symbol *sym)
1308 {
1309         struct expression *assign, *symbol;
1310
1311         symbol = symbol_expression(sym);
1312         assign = assign_expression(symbol, sym->initializer);
1313         __split_expr(assign);
1314 }
1315
1316 static void call_split_expr(struct expression *expr)
1317 {
1318         __split_expr(expr);
1319 }
1320
1321 static void do_initializer_stuff(struct symbol *sym)
1322 {
1323         if (!sym->initializer)
1324                 return;
1325
1326         if (sym->initializer->type == EXPR_INITIALIZER) {
1327                 if (get_real_base_type(sym)->type == SYM_ARRAY)
1328                         fake_element_assigns(sym, call_split_expr);
1329                 else
1330                         fake_member_assigns(sym, call_split_expr);
1331         } else {
1332                 fake_assign_expr(sym);
1333         }
1334 }
1335
1336 static void split_declaration(struct symbol_list *sym_list)
1337 {
1338         struct symbol *sym;
1339
1340         FOR_EACH_PTR(sym_list, sym) {
1341                 __pass_to_client(sym, DECLARATION_HOOK);
1342                 do_initializer_stuff(sym);
1343                 split_sym(sym);
1344         } END_FOR_EACH_PTR(sym);
1345 }
1346
1347 static void call_global_assign_hooks(struct expression *assign)
1348 {
1349         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1350 }
1351
1352 static void fake_global_assign(struct symbol *sym)
1353 {
1354         struct expression *assign, *symbol;
1355
1356         if (get_real_base_type(sym)->type == SYM_ARRAY) {
1357                 if (sym->initializer && sym->initializer->type == EXPR_INITIALIZER) {
1358                         fake_element_assigns(sym, call_global_assign_hooks);
1359                 } else if (sym->initializer) {
1360                         symbol = symbol_expression(sym);
1361                         assign = assign_expression(symbol, sym->initializer);
1362                         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1363                 } else {
1364                         fake_element_assigns_helper(symbol_expression(sym), NULL, call_global_assign_hooks);
1365                 }
1366         } else if (get_real_base_type(sym)->type == SYM_STRUCT) {
1367                 if (sym->initializer && sym->initializer->type == EXPR_INITIALIZER) {
1368                         fake_member_assigns(sym, call_global_assign_hooks);
1369                 } else if (sym->initializer) {
1370                         symbol = symbol_expression(sym);
1371                         assign = assign_expression(symbol, sym->initializer);
1372                         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1373                 } else {
1374                         fake_member_assigns_helper(symbol_expression(sym), NULL, call_global_assign_hooks);
1375                 }
1376         } else {
1377                 symbol = symbol_expression(sym);
1378                 if (sym->initializer)
1379                         assign = assign_expression(symbol, sym->initializer);
1380                 else
1381                         assign = assign_expression(symbol, zero_expr());
1382                 __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1383         }
1384 }
1385
1386 static void start_function_definition(struct symbol *sym)
1387 {
1388         __in_function_def = 1;
1389         __pass_to_client(sym, FUNC_DEF_HOOK);
1390         __in_function_def = 0;
1391         __pass_to_client(sym, AFTER_DEF_HOOK);
1392
1393 }
1394
1395 static void split_function(struct symbol *sym)
1396 {
1397         struct symbol *base_type = get_base_type(sym);
1398
1399         if (!base_type->stmt && !base_type->inline_stmt)
1400                 return;
1401
1402         gettimeofday(&fn_start_time, NULL);
1403         cur_func_sym = sym;
1404         if (sym->ident)
1405                 cur_func = sym->ident->name;
1406         __smatch_lineno = sym->pos.line;
1407         loop_count = 0;
1408         last_goto_statement_handled = 0;
1409         sm_debug("new function:  %s\n", cur_func);
1410         __stree_id = 0;
1411         if (option_two_passes) {
1412                 __unnullify_path();
1413                 loop_num = 0;
1414                 final_pass = 0;
1415                 start_function_definition(sym);
1416                 __split_stmt(base_type->stmt);
1417                 __split_stmt(base_type->inline_stmt);
1418                 nullify_path();
1419         }
1420         __unnullify_path();
1421         loop_num = 0;
1422         final_pass = 1;
1423         start_function_definition(sym);
1424         __split_stmt(base_type->stmt);
1425         __split_stmt(base_type->inline_stmt);
1426         __pass_to_client(sym, END_FUNC_HOOK);
1427         __pass_to_client(sym, AFTER_FUNC_HOOK);
1428
1429         clear_all_states();
1430         cur_func_sym = NULL;
1431         cur_func = NULL;
1432         free_data_info_allocs();
1433         free_expression_stack(&switch_expr_stack);
1434         __free_ptr_list((struct ptr_list **)&big_statement_stack);
1435         __bail_on_rest_of_function = 0;
1436 }
1437
1438 static void parse_inline(struct expression *call)
1439 {
1440         struct symbol *base_type;
1441         int loop_num_bak = loop_num;
1442         int loop_count_bak = loop_count;
1443         int final_pass_bak = final_pass;
1444         char *cur_func_bak = cur_func;
1445         struct statement_list *big_statement_stack_bak = big_statement_stack;
1446         struct expression_list *big_expression_stack_bak = big_expression_stack;
1447         struct expression_list *big_condition_stack_bak = big_condition_stack;
1448         struct expression_list *switch_expr_stack_bak = switch_expr_stack;
1449         struct symbol *cur_func_sym_bak = cur_func_sym;
1450
1451         __pass_to_client(call, INLINE_FN_START);
1452         final_pass = 0;  /* don't print anything */
1453         __inline_fn = call;
1454
1455         base_type = get_base_type(call->fn->symbol);
1456         cur_func_sym = call->fn->symbol;
1457         if (call->fn->symbol->ident)
1458                 cur_func = call->fn->symbol->ident->name;
1459         else
1460                 cur_func = NULL;
1461         set_position(call->fn->symbol->pos);
1462
1463         save_all_states();
1464         big_statement_stack = NULL;
1465         big_expression_stack = NULL;
1466         big_condition_stack = NULL;
1467         switch_expr_stack = NULL;
1468
1469         sm_debug("inline function:  %s\n", cur_func);
1470         __unnullify_path();
1471         loop_num = 0;
1472         loop_count = 0;
1473         start_function_definition(call->fn->symbol);
1474         __split_stmt(base_type->stmt);
1475         __split_stmt(base_type->inline_stmt);
1476         __pass_to_client(call->fn->symbol, END_FUNC_HOOK);
1477         __pass_to_client(call->fn->symbol, AFTER_FUNC_HOOK);
1478
1479         free_expression_stack(&switch_expr_stack);
1480         __free_ptr_list((struct ptr_list **)&big_statement_stack);
1481         nullify_path();
1482         free_goto_stack();
1483
1484         loop_num = loop_num_bak;
1485         loop_count = loop_count_bak;
1486         final_pass = final_pass_bak;
1487         cur_func_sym = cur_func_sym_bak;
1488         cur_func = cur_func_bak;
1489         big_statement_stack = big_statement_stack_bak;
1490         big_expression_stack = big_expression_stack_bak;
1491         big_condition_stack = big_condition_stack_bak;
1492         switch_expr_stack = switch_expr_stack_bak;
1493
1494         restore_all_states();
1495         set_position(call->pos);
1496         __inline_fn = NULL;
1497         __pass_to_client(call, INLINE_FN_END);
1498 }
1499
1500 static struct symbol_list *inlines_called;
1501 static void add_inline_function(struct symbol *sym)
1502 {
1503         static struct symbol_list *already_added;
1504         struct symbol *tmp;
1505
1506         FOR_EACH_PTR(already_added, tmp) {
1507                 if (tmp == sym)
1508                         return;
1509         } END_FOR_EACH_PTR(tmp);
1510
1511         add_ptr_list(&already_added, sym);
1512         add_ptr_list(&inlines_called, sym);
1513 }
1514
1515 static void process_inlines(void)
1516 {
1517         struct symbol *tmp;
1518
1519         FOR_EACH_PTR(inlines_called, tmp) {
1520                 split_function(tmp);
1521         } END_FOR_EACH_PTR(tmp);
1522         free_ptr_list(&inlines_called);
1523 }
1524
1525 static struct symbol *get_last_scoped_symbol(struct symbol_list *big_list, int use_static)
1526 {
1527         struct symbol *sym;
1528
1529         FOR_EACH_PTR_REVERSE(big_list, sym) {
1530                 if (!sym->scope)
1531                         continue;
1532                 if (use_static && sym->ctype.modifiers & MOD_STATIC)
1533                         return sym;
1534                 if (!use_static && !(sym->ctype.modifiers & MOD_STATIC))
1535                         return sym;
1536         } END_FOR_EACH_PTR_REVERSE(sym);
1537
1538         return NULL;
1539 }
1540
1541 static void split_inlines_in_scope(struct symbol *sym)
1542 {
1543         struct symbol *base;
1544         struct symbol_list *scope_list;
1545         int stream;
1546
1547         scope_list = sym->scope->symbols;
1548         stream = sym->pos.stream;
1549
1550         /* find the last static symbol in the file */
1551         FOR_EACH_PTR_REVERSE(scope_list, sym) {
1552                 if (sym->pos.stream != stream)
1553                         continue;
1554                 if (sym->type != SYM_NODE)
1555                         continue;
1556                 base = get_base_type(sym);
1557                 if (!base)
1558                         continue;
1559                 if (base->type != SYM_FN)
1560                         continue;
1561                 if (!base->inline_stmt)
1562                         continue;
1563                 add_inline_function(sym);
1564         } END_FOR_EACH_PTR_REVERSE(sym);
1565
1566         process_inlines();
1567 }
1568
1569 static void split_inlines(struct symbol_list *sym_list)
1570 {
1571         struct symbol *sym;
1572
1573         sym = get_last_scoped_symbol(sym_list, 0);
1574         if (sym)
1575                 split_inlines_in_scope(sym);
1576         sym = get_last_scoped_symbol(sym_list, 1);
1577         if (sym)
1578                 split_inlines_in_scope(sym);
1579 }
1580
1581 static struct stree *clone_estates_perm(struct stree *orig)
1582 {
1583         struct stree *ret = NULL;
1584         struct sm_state *tmp;
1585
1586         FOR_EACH_SM(orig, tmp) {
1587                 set_state_stree_perm(&ret, tmp->owner, tmp->name, tmp->sym, clone_estate_perm(tmp->state));
1588         } END_FOR_EACH_SM(tmp);
1589
1590         return ret;
1591 }
1592
1593 struct position last_pos;
1594 static void split_functions(struct symbol_list *sym_list)
1595 {
1596         struct symbol *sym;
1597
1598         __unnullify_path();
1599         FOR_EACH_PTR(sym_list, sym) {
1600                 set_position(sym->pos);
1601                 if (sym->type != SYM_NODE || get_base_type(sym)->type != SYM_FN) {
1602                         __pass_to_client(sym, BASE_HOOK);
1603                         fake_global_assign(sym);
1604                 }
1605         } END_FOR_EACH_PTR(sym);
1606         global_states = clone_estates_perm(get_all_states_stree(SMATCH_EXTRA));
1607         nullify_path();
1608
1609         FOR_EACH_PTR(sym_list, sym) {
1610                 set_position(sym->pos);
1611                 if (sym->type == SYM_NODE && get_base_type(sym)->type == SYM_FN) {
1612                         split_function(sym);
1613                         process_inlines();
1614                 }
1615                 last_pos = sym->pos;
1616         } END_FOR_EACH_PTR(sym);
1617         split_inlines(sym_list);
1618         __pass_to_client(sym_list, END_FILE_HOOK);
1619 }
1620
1621 void smatch(int argc, char **argv)
1622 {
1623         struct string_list *filelist = NULL;
1624         struct symbol_list *sym_list;
1625         struct timeval stop, start;
1626
1627         gettimeofday(&start, NULL);
1628
1629         if (argc < 2) {
1630                 printf("Usage:  smatch [--debug] <filename.c>\n");
1631                 exit(1);
1632         }
1633         sparse_initialize(argc, argv, &filelist);
1634         set_valid_ptr_max();
1635         FOR_EACH_PTR_NOTAG(filelist, base_file) {
1636                 if (option_file_output) {
1637                         char buf[256];
1638
1639                         snprintf(buf, sizeof(buf), "%s.smatch", base_file);
1640                         sm_outfd = fopen(buf, "w");
1641                         if (!sm_outfd) {
1642                                 printf("Error:  Cannot open %s\n", base_file);
1643                                 exit(1);
1644                         }
1645                 }
1646                 sym_list = sparse_keep_tokens(base_file);
1647                 split_functions(sym_list);
1648         } END_FOR_EACH_PTR_NOTAG(base_file);
1649
1650         gettimeofday(&stop, NULL);
1651
1652         set_position(last_pos);
1653         if (option_time)
1654                 sm_msg("time: %lu", stop.tv_sec - start.tv_sec);
1655 }