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 *case_expr,
 697                                       struct expression *case_to)
 698 {
 699         sval_t start, end;
 700         struct range_list *rl = NULL;
 701
 702         if (get_value(case_to, &end) && get_value(case_expr, &start)) {
 703                 add_range(&rl, start, end);
 704         } else if (get_value(case_expr, &start)) {
 705                 add_range(&rl, start, start);
 706         }
 707
 708         return rl;
 709 }
 710
 711 static void split_known_switch(struct statement *stmt, sval_t sval)
 712 {
 713         struct statement *tmp;
 714         struct range_list *rl;
 715
 716         __split_expr(stmt->switch_expression);
 717
 718         push_expression(&switch_expr_stack, stmt->switch_expression);
 719         __save_switch_states(top_expression(switch_expr_stack));
 720         nullify_path();
 721         __push_default();
 722         __push_breaks();
 723
 724         stmt = stmt->switch_statement;
 725
 726         __push_scope_hooks();
 727         FOR_EACH_PTR(stmt->stmts, tmp) {
 728                 __smatch_lineno = tmp->pos.line;
 729                 if (is_case_val(tmp, sval)) {
 730                         rl = alloc_rl(sval, sval);
 731                         __merge_switches(top_expression(switch_expr_stack), rl);
 732                         __pass_case_to_client(top_expression(switch_expr_stack), rl);
 733                 }
 734                 if (__path_is_null())
 735                         continue;
 736                 __split_stmt(tmp);
 737                 if (__path_is_null()) {
 738                         __set_default();
 739                         goto out;
 740                 }
 741         } END_FOR_EACH_PTR(tmp);
 742 out:
 743         __call_scope_hooks();
 744         if (!__pop_default())
 745                 __merge_switches(top_expression(switch_expr_stack), NULL);
 746         __discard_switches();
 747         __merge_breaks();
 748         pop_expression(&switch_expr_stack);
 749 }
 750
 751 static void split_case(struct statement *stmt)
 752 {
 753         struct range_list *rl = NULL;
 754
 755         rl = get_case_rl(stmt->case_expression, stmt->case_to);
 756         while (stmt->case_statement->type == STMT_CASE) {
 757                 struct range_list *tmp;
 758
 759                 tmp = get_case_rl(stmt->case_statement->case_expression,
 760                                   stmt->case_statement->case_to);
 761                 if (!tmp)
 762                         break;
 763                 rl = rl_union(rl, tmp);
 764                 if (!stmt->case_expression)
 765                         __set_default();
 766                 stmt = stmt->case_statement;
 767         }
 768
 769         __merge_switches(top_expression(switch_expr_stack), rl);
 770
 771         if (!stmt->case_expression)
 772                 __set_default();
 773         __split_stmt(stmt->case_statement);
 774 }
 775
 776 static int taking_too_long(void)
 777 {
 778         int ms;
 779
 780         ms = ms_since(&fn_start_time);
 781         if (ms > 1000 * 60 * 5)  /* five minutes */
 782                 return 1;
 783         return 0;
 784 }
 785
 786 static int is_last_stmt(struct statement *cur_stmt)
 787 {
 788         struct symbol *fn = get_base_type(cur_func_sym);
 789         struct statement *stmt;
 790
 791         if (!fn)
 792                 return 0;
 793         stmt = fn->stmt;
 794         if (!stmt)
 795                 stmt = fn->inline_stmt;
 796         if (!stmt || stmt->type != STMT_COMPOUND)
 797                 return 0;
 798         stmt = last_ptr_list((struct ptr_list *)stmt->stmts);
 799         if (stmt && stmt->type == STMT_LABEL)
 800                 stmt = stmt->label_statement;
 801         if (stmt == cur_stmt)
 802                 return 1;
 803         return 0;
 804 }
 805
 806 static void handle_backward_goto(struct statement *goto_stmt)
 807 {
 808         const char *goto_name, *label_name;
 809         struct statement *func_stmt;
 810         struct symbol *base_type = get_base_type(cur_func_sym);
 811         struct statement *tmp;
 812         int found = 0;
 813
 814         if (!option_info)
 815                 return;
 816         if (last_goto_statement_handled)
 817                 return;
 818         last_goto_statement_handled = 1;
 819
 820         if (!goto_stmt->goto_label ||
 821             goto_stmt->goto_label->type != SYM_LABEL ||
 822             !goto_stmt->goto_label->ident)
 823                 return;
 824         goto_name = goto_stmt->goto_label->ident->name;
 825
 826         func_stmt = base_type->stmt;
 827         if (!func_stmt)
 828                 func_stmt = base_type->inline_stmt;
 829         if (!func_stmt)
 830                 return;
 831         if (func_stmt->type != STMT_COMPOUND)
 832                 return;
 833
 834         FOR_EACH_PTR(func_stmt->stmts, tmp) {
 835                 if (!found) {
 836                         if (tmp->type != STMT_LABEL)
 837                                 continue;
 838                         if (!tmp->label_identifier ||
 839                             tmp->label_identifier->type != SYM_LABEL ||
 840                             !tmp->label_identifier->ident)
 841                                 continue;
 842                         label_name = tmp->label_identifier->ident->name;
 843                         if (strcmp(goto_name, label_name) != 0)
 844                                 continue;
 845                         found = 1;
 846                 }
 847                 __split_stmt(tmp);
 848         } END_FOR_EACH_PTR(tmp);
 849 }
 850
 851 static void fake_a_return(void)
 852 {
 853         struct symbol *return_type;
 854
 855         nullify_path();
 856         __unnullify_path();
 857
 858         return_type = get_real_base_type(cur_func_sym);
 859         return_type = get_real_base_type(return_type);
 860         if (return_type != &void_ctype) {
 861                 __pass_to_client(unknown_value_expression(NULL), RETURN_HOOK);
 862                 nullify_path();
 863         }
 864 }
 865
 866 static void fake_an_empty_default(struct position pos)
 867 {
 868         static struct statement none = {};
 869
 870         none.pos = pos;
 871         none.type = STMT_NONE;
 872         __merge_switches(top_expression(switch_expr_stack), NULL);
 873         __split_stmt(&none);
 874 }
 875
 876 static void split_compound(struct statement *stmt)
 877 {
 878         struct statement *prev = NULL;
 879         struct statement *cur = NULL;
 880         struct statement *next;
 881
 882         __push_scope_hooks();
 883
 884         FOR_EACH_PTR(stmt->stmts, next) {
 885                 /* just set them all ahead of time */
 886                 set_parent_stmt(next, stmt);
 887
 888                 if (cur) {
 889                         __prev_stmt = prev;
 890                         __next_stmt = next;
 891                         __cur_stmt = cur;
 892                         __split_stmt(cur);
 893                 }
 894                 prev = cur;
 895                 cur = next;
 896         } END_FOR_EACH_PTR(next);
 897         if (cur) {
 898                 __prev_stmt = prev;
 899                 __cur_stmt = cur;
 900                 __next_stmt = NULL;
 901                 __split_stmt(cur);
 902         }
 903
 904         __call_scope_hooks();
 905 }
 906
 907 void __split_label_stmt(struct statement *stmt)
 908 {
 909         if (stmt->label_identifier &&
 910             stmt->label_identifier->type == SYM_LABEL &&
 911             stmt->label_identifier->ident) {
 912                 loop_count |= 0x80000000;
 913                 __merge_gotos(stmt->label_identifier->ident->name);
 914         }
 915 }
 916
 917 void __split_stmt(struct statement *stmt)
 918 {
 919         sval_t sval;
 920
 921         if (!stmt)
 922                 goto out;
 923
 924         if (__bail_on_rest_of_function)
 925                 return;
 926
 927         if (out_of_memory() || taking_too_long()) {
 928
 929                 __bail_on_rest_of_function = 1;
 930                 sm_msg("Function too hairy.  Giving up.");
 931                 fake_a_return();
 932                 final_pass = 0;  /* turn off sm_msg() from here */
 933                 return;
 934         }
 935
 936         add_ptr_list(&big_statement_stack, stmt);
 937         free_expression_stack(&big_expression_stack);
 938         set_position(stmt->pos);
 939         __pass_to_client(stmt, STMT_HOOK);
 940
 941         switch (stmt->type) {
 942         case STMT_DECLARATION:
 943                 split_declaration(stmt->declaration);
 944                 break;
 945         case STMT_RETURN:
 946                 __split_expr(stmt->ret_value);
 947                 __pass_to_client(stmt->ret_value, RETURN_HOOK);
 948                 __process_post_op_stack();
 949                 nullify_path();
 950                 break;
 951         case STMT_EXPRESSION:
 952                 __split_expr(stmt->expression);
 953                 break;
 954         case STMT_COMPOUND:
 955                 split_compound(stmt);
 956                 break;
 957         case STMT_IF:
 958                 set_parent_stmt(stmt->if_true, stmt);
 959                 set_parent_stmt(stmt->if_false, stmt);
 960
 961                 if (known_condition_true(stmt->if_conditional)) {
 962                         __split_stmt(stmt->if_true);
 963                         break;
 964                 }
 965                 if (known_condition_false(stmt->if_conditional)) {
 966                         __split_stmt(stmt->if_false);
 967                         break;
 968                 }
 969                 __split_whole_condition(stmt->if_conditional);
 970                 __split_stmt(stmt->if_true);
 971                 if (empty_statement(stmt->if_true) &&
 972                         last_stmt_on_same_line() &&
 973                         !get_macro_name(stmt->if_true->pos))
 974                         sm_msg("warn: if();");
 975                 __push_true_states();
 976                 __use_false_states();
 977                 __split_stmt(stmt->if_false);
 978                 __merge_true_states();
 979                 break;
 980         case STMT_ITERATOR:
 981                 set_parent_stmt(stmt->iterator_pre_statement, stmt);
 982                 set_parent_stmt(stmt->iterator_statement, stmt);
 983                 set_parent_stmt(stmt->iterator_post_statement, stmt);
 984
 985                 if (stmt->iterator_pre_condition)
 986                         handle_pre_loop(stmt);
 987                 else if (stmt->iterator_post_condition)
 988                         handle_post_loop(stmt);
 989                 else {
 990                         // these are for(;;) type loops.
 991                         handle_pre_loop(stmt);
 992                 }
 993                 break;
 994         case STMT_SWITCH:
 995                 set_parent_stmt(stmt->switch_statement, stmt);
 996
 997                 if (get_value(stmt->switch_expression, &sval)) {
 998                         split_known_switch(stmt, sval);
 999                         break;
1000                 }
1001                 __split_expr(stmt->switch_expression);
1002                 push_expression(&switch_expr_stack, stmt->switch_expression);
1003                 __save_switch_states(top_expression(switch_expr_stack));
1004                 nullify_path();
1005                 __push_default();
1006                 __push_breaks();
1007                 __split_stmt(stmt->switch_statement);
1008                 if (!__pop_default())
1009                         fake_an_empty_default(stmt->pos);
1010                 __discard_switches();
1011                 __merge_breaks();
1012                 pop_expression(&switch_expr_stack);
1013                 break;
1014         case STMT_CASE:
1015                 split_case(stmt);
1016                 break;
1017         case STMT_LABEL:
1018                 __split_label_stmt(stmt);
1019                 __split_stmt(stmt->label_statement);
1020                 break;
1021         case STMT_GOTO:
1022                 __split_expr(stmt->goto_expression);
1023                 if (stmt->goto_label && stmt->goto_label->type == SYM_NODE) {
1024                         if (!strcmp(stmt->goto_label->ident->name, "break")) {
1025                                 __process_breaks();
1026                         } else if (!strcmp(stmt->goto_label->ident->name,
1027                                            "continue")) {
1028                                 __process_continues();
1029                         }
1030                 } else if (stmt->goto_label &&
1031                            stmt->goto_label->type == SYM_LABEL &&
1032                            stmt->goto_label->ident) {
1033                         __save_gotos(stmt->goto_label->ident->name);
1034                 }
1035                 nullify_path();
1036                 if (is_last_stmt(stmt))
1037                         handle_backward_goto(stmt);
1038                 break;
1039         case STMT_NONE:
1040                 break;
1041         case STMT_ASM:
1042                 __pass_to_client(stmt, ASM_HOOK);
1043                 __split_expr(stmt->asm_string);
1044                 split_asm_constraints(stmt->asm_outputs);
1045                 split_asm_constraints(stmt->asm_inputs);
1046                 split_asm_constraints(stmt->asm_clobbers);
1047                 break;
1048         case STMT_CONTEXT:
1049                 break;
1050         case STMT_RANGE:
1051                 __split_expr(stmt->range_expression);
1052                 __split_expr(stmt->range_low);
1053                 __split_expr(stmt->range_high);
1054                 break;
1055         }
1056         __pass_to_client(stmt, STMT_HOOK_AFTER);
1057 out:
1058         __process_post_op_stack();
1059 }
1060
1061 static void split_expr_list(struct expression_list *expr_list, struct expression *parent)
1062 {
1063         struct expression *expr;
1064
1065         FOR_EACH_PTR(expr_list, expr) {
1066                 set_parent_expr(expr, parent);
1067                 __split_expr(expr);
1068                 __process_post_op_stack();
1069         } END_FOR_EACH_PTR(expr);
1070 }
1071
1072 static void split_sym(struct symbol *sym)
1073 {
1074         if (!sym)
1075                 return;
1076         if (!(sym->namespace & NS_SYMBOL))
1077                 return;
1078
1079         __split_stmt(sym->stmt);
1080         __split_expr(sym->array_size);
1081         split_symlist(sym->arguments);
1082         split_symlist(sym->symbol_list);
1083         __split_stmt(sym->inline_stmt);
1084         split_symlist(sym->inline_symbol_list);
1085 }
1086
1087 static void split_symlist(struct symbol_list *sym_list)
1088 {
1089         struct symbol *sym;
1090
1091         FOR_EACH_PTR(sym_list, sym) {
1092                 split_sym(sym);
1093         } END_FOR_EACH_PTR(sym);
1094 }
1095
1096 typedef void (fake_cb)(struct expression *expr);
1097
1098 static int member_to_number(struct expression *expr, struct ident *member)
1099 {
1100         struct symbol *type, *tmp;
1101         char *name;
1102         int i;
1103
1104         if (!member)
1105                 return -1;
1106         name = member->name;
1107
1108         type = get_type(expr);
1109         if (!type || type->type != SYM_STRUCT)
1110                 return -1;
1111
1112         i = -1;
1113         FOR_EACH_PTR(type->symbol_list, tmp) {
1114                 i++;
1115                 if (!tmp->ident)
1116                         continue;
1117                 if (strcmp(name, tmp->ident->name) == 0)
1118                         return i;
1119         } END_FOR_EACH_PTR(tmp);
1120         return -1;
1121 }
1122
1123 static struct ident *number_to_member(struct expression *expr, int num)
1124 {
1125         struct symbol *type, *member;
1126         int i = 0;
1127
1128         type = get_type(expr);
1129         if (!type || type->type != SYM_STRUCT)
1130                 return NULL;
1131
1132         FOR_EACH_PTR(type->symbol_list, member) {
1133                 if (i == num)
1134                         return member->ident;
1135                 i++;
1136         } END_FOR_EACH_PTR(member);
1137         return NULL;
1138 }
1139
1140 static void fake_element_assigns_helper(struct expression *array, struct expression_list *expr_list, fake_cb *fake_cb);
1141
1142 struct member_set {
1143         struct ident *ident;
1144         int set;
1145 };
1146
1147 static struct member_set *alloc_member_set(struct symbol *type)
1148 {
1149         struct member_set *member_set;
1150         struct symbol *member;
1151         int member_count;
1152         int member_idx;
1153
1154         member_count = ptr_list_size((struct ptr_list *)type->symbol_list);
1155         member_set = malloc(member_count * sizeof(*member_set));
1156         member_idx = 0;
1157         FOR_EACH_PTR(type->symbol_list, member) {
1158                 member_set[member_idx].ident = member->ident;
1159                 member_set[member_idx].set = 0;
1160                 member_idx++;
1161         } END_FOR_EACH_PTR(member);
1162
1163         return member_set;
1164 }
1165
1166 static void mark_member_as_set(struct symbol *type, struct member_set *member_set, struct ident *ident)
1167 {
1168         int member_count = ptr_list_size((struct ptr_list *)type->symbol_list);
1169         int i;
1170
1171         for (i = 0; i < member_count; i++) {
1172                 if (member_set[i].ident == ident) {
1173                         member_set[i].set = 1;
1174                         return;
1175                 }
1176         }
1177 //      crap.  this is buggy.
1178 //      sm_msg("internal smatch error in initializer %s.%s", type->ident->name, ident->name);
1179 }
1180
1181 static void set_inner_struct_members(struct expression *expr, struct symbol *member)
1182 {
1183         struct expression *edge_member, *assign;
1184         struct symbol *base = get_real_base_type(member);
1185         struct symbol *tmp;
1186
1187         if (member->ident)
1188                 expr = member_expression(expr, '.', member->ident);
1189
1190         FOR_EACH_PTR(base->symbol_list, tmp) {
1191                 struct symbol *type;
1192
1193                 type = get_real_base_type(tmp);
1194                 if (!type)
1195                         continue;
1196
1197                 if (tmp->ident) {
1198                         edge_member = member_expression(expr, '.', tmp->ident);
1199                         if (get_state_expr(SMATCH_EXTRA, edge_member))
1200                                 continue;
1201                 }
1202
1203                 if (type->type == SYM_UNION || type->type == SYM_STRUCT) {
1204                         set_inner_struct_members(expr, tmp);
1205                         continue;
1206                 }
1207
1208                 if (!tmp->ident)
1209                         continue;
1210
1211                 assign = assign_expression(edge_member, zero_expr());
1212                 __split_expr(assign);
1213         } END_FOR_EACH_PTR(tmp);
1214
1215
1216 }
1217
1218 static void set_unset_to_zero(struct symbol *type, struct expression *expr)
1219 {
1220         struct symbol *tmp;
1221         struct expression *member = NULL;
1222         struct expression *assign;
1223         int op = '*';
1224
1225         if (expr->type == EXPR_PREOP && expr->op == '&') {
1226                 expr = strip_expr(expr->unop);
1227                 op = '.';
1228         }
1229
1230         FOR_EACH_PTR(type->symbol_list, tmp) {
1231                 type = get_real_base_type(tmp);
1232                 if (!type)
1233                         continue;
1234
1235                 if (tmp->ident) {
1236                         member = member_expression(expr, op, tmp->ident);
1237                         if (get_state_expr(SMATCH_EXTRA, member))
1238                                 continue;
1239                 }
1240
1241                 if (type->type == SYM_UNION || type->type == SYM_STRUCT) {
1242                         set_inner_struct_members(expr, tmp);
1243                         continue;
1244                 }
1245                 if (type->type == SYM_ARRAY)
1246                         continue;
1247                 if (!tmp->ident)
1248                         continue;
1249
1250                 assign = assign_expression(member, zero_expr());
1251                 __split_expr(assign);
1252         } END_FOR_EACH_PTR(tmp);
1253 }
1254
1255 static void fake_member_assigns_helper(struct expression *symbol, struct expression_list *members, fake_cb *fake_cb)
1256 {
1257         struct expression *deref, *assign, *tmp;
1258         struct symbol *struct_type, *type;
1259         struct ident *member;
1260         int member_idx;
1261         struct member_set *member_set;
1262
1263         struct_type = get_type(symbol);
1264         if (!struct_type ||
1265             (struct_type->type != SYM_STRUCT && struct_type->type != SYM_UNION))
1266                 return;
1267
1268         member_set = alloc_member_set(struct_type);
1269
1270         member_idx = 0;
1271         FOR_EACH_PTR(members, tmp) {
1272                 member = number_to_member(symbol, member_idx);
1273                 while (tmp->type == EXPR_IDENTIFIER) {
1274                         member = tmp->expr_ident;
1275                         member_idx = member_to_number(symbol, member);
1276                         tmp = tmp->ident_expression;
1277                 }
1278                 mark_member_as_set(struct_type, member_set, member);
1279                 member_idx++;
1280                 deref = member_expression(symbol, '.', member);
1281                 if (tmp->type == EXPR_INITIALIZER) {
1282                         type = get_type(deref);
1283                         if (type && type->type == SYM_ARRAY)
1284                                 fake_element_assigns_helper(deref, tmp->expr_list, fake_cb);
1285                         else
1286                                 fake_member_assigns_helper(deref, tmp->expr_list, fake_cb);
1287                 } else {
1288                         assign = assign_expression(deref, tmp);
1289                         fake_cb(assign);
1290                 }
1291         } END_FOR_EACH_PTR(tmp);
1292
1293         set_unset_to_zero(struct_type, symbol);
1294 }
1295
1296 static void fake_member_assigns(struct symbol *sym, fake_cb *fake_cb)
1297 {
1298         fake_member_assigns_helper(symbol_expression(sym),
1299                                    sym->initializer->expr_list, fake_cb);
1300 }
1301
1302 static void fake_element_assigns_helper(struct expression *array, struct expression_list *expr_list, fake_cb *fake_cb)
1303 {
1304         struct expression *offset, *binop, *assign, *tmp;
1305         struct symbol *type;
1306         int idx;
1307
1308         if (ptr_list_size((struct ptr_list *)expr_list) > 1000)
1309                 return;
1310
1311         idx = 0;
1312         FOR_EACH_PTR(expr_list, tmp) {
1313                 if (tmp->type == EXPR_INDEX) {
1314                         if (tmp->idx_from != tmp->idx_to)
1315                                 return;
1316                         idx = tmp->idx_from;
1317                         if (!tmp->idx_expression)
1318                                 goto next;
1319                         tmp = tmp->idx_expression;
1320                 }
1321                 offset = value_expr(idx);
1322                 binop = array_element_expression(array, offset);
1323                 if (tmp->type == EXPR_INITIALIZER) {
1324                         type = get_type(binop);
1325                         if (type && type->type == SYM_ARRAY)
1326                                 fake_element_assigns_helper(binop, tmp->expr_list, fake_cb);
1327                         else
1328                                 fake_member_assigns_helper(binop, tmp->expr_list, fake_cb);
1329                 } else {
1330                         assign = assign_expression(binop, tmp);
1331                         fake_cb(assign);
1332                 }
1333 next:
1334                 idx++;
1335         } END_FOR_EACH_PTR(tmp);
1336 }
1337
1338 static void fake_element_assigns(struct symbol *sym, fake_cb *fake_cb)
1339 {
1340         fake_element_assigns_helper(symbol_expression(sym), sym->initializer->expr_list, fake_cb);
1341 }
1342
1343 static void fake_assign_expr(struct symbol *sym)
1344 {
1345         struct expression *assign, *symbol;
1346
1347         symbol = symbol_expression(sym);
1348         assign = assign_expression(symbol, sym->initializer);
1349         __split_expr(assign);
1350 }
1351
1352 static void call_split_expr(struct expression *expr)
1353 {
1354         __split_expr(expr);
1355 }
1356
1357 static void do_initializer_stuff(struct symbol *sym)
1358 {
1359         if (!sym->initializer)
1360                 return;
1361
1362         if (sym->initializer->type == EXPR_INITIALIZER) {
1363                 if (get_real_base_type(sym)->type == SYM_ARRAY)
1364                         fake_element_assigns(sym, call_split_expr);
1365                 else
1366                         fake_member_assigns(sym, call_split_expr);
1367         } else {
1368                 fake_assign_expr(sym);
1369         }
1370 }
1371
1372 static void split_declaration(struct symbol_list *sym_list)
1373 {
1374         struct symbol *sym;
1375
1376         FOR_EACH_PTR(sym_list, sym) {
1377                 __pass_to_client(sym, DECLARATION_HOOK);
1378                 do_initializer_stuff(sym);
1379                 split_sym(sym);
1380         } END_FOR_EACH_PTR(sym);
1381 }
1382
1383 static void call_global_assign_hooks(struct expression *assign)
1384 {
1385         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1386 }
1387
1388 static void fake_global_assign(struct symbol *sym)
1389 {
1390         struct expression *assign, *symbol;
1391
1392         if (get_real_base_type(sym)->type == SYM_ARRAY) {
1393                 if (sym->initializer && sym->initializer->type == EXPR_INITIALIZER) {
1394                         fake_element_assigns(sym, call_global_assign_hooks);
1395                 } else if (sym->initializer) {
1396                         symbol = symbol_expression(sym);
1397                         assign = assign_expression(symbol, sym->initializer);
1398                         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1399                 } else {
1400                         fake_element_assigns_helper(symbol_expression(sym), NULL, call_global_assign_hooks);
1401                 }
1402         } else if (get_real_base_type(sym)->type == SYM_STRUCT) {
1403                 if (sym->initializer && sym->initializer->type == EXPR_INITIALIZER) {
1404                         fake_member_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_member_assigns_helper(symbol_expression(sym), NULL, call_global_assign_hooks);
1411                 }
1412         } else {
1413                 symbol = symbol_expression(sym);
1414                 if (sym->initializer)
1415                         assign = assign_expression(symbol, sym->initializer);
1416                 else
1417                         assign = assign_expression(symbol, zero_expr());
1418                 __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1419         }
1420 }
1421
1422 static void start_function_definition(struct symbol *sym)
1423 {
1424         __in_function_def = 1;
1425         __pass_to_client(sym, FUNC_DEF_HOOK);
1426         __in_function_def = 0;
1427         __pass_to_client(sym, AFTER_DEF_HOOK);
1428
1429 }
1430
1431 static void split_function(struct symbol *sym)
1432 {
1433         struct symbol *base_type = get_base_type(sym);
1434
1435         if (!base_type->stmt && !base_type->inline_stmt)
1436                 return;
1437
1438         gettimeofday(&fn_start_time, NULL);
1439         cur_func_sym = sym;
1440         if (sym->ident)
1441                 cur_func = sym->ident->name;
1442         __smatch_lineno = sym->pos.line;
1443         loop_count = 0;
1444         last_goto_statement_handled = 0;
1445         sm_debug("new function:  %s\n", cur_func);
1446         __stree_id = 0;
1447         if (option_two_passes) {
1448                 __unnullify_path();
1449                 loop_num = 0;
1450                 final_pass = 0;
1451                 start_function_definition(sym);
1452                 __split_stmt(base_type->stmt);
1453                 __split_stmt(base_type->inline_stmt);
1454                 nullify_path();
1455         }
1456         __unnullify_path();
1457         loop_num = 0;
1458         final_pass = 1;
1459         start_function_definition(sym);
1460         __split_stmt(base_type->stmt);
1461         __split_stmt(base_type->inline_stmt);
1462         __pass_to_client(sym, END_FUNC_HOOK);
1463         __pass_to_client(sym, AFTER_FUNC_HOOK);
1464
1465         clear_all_states();
1466         cur_func_sym = NULL;
1467         cur_func = NULL;
1468         free_data_info_allocs();
1469         free_expression_stack(&switch_expr_stack);
1470         __free_ptr_list((struct ptr_list **)&big_statement_stack);
1471         __bail_on_rest_of_function = 0;
1472 }
1473
1474 static void parse_inline(struct expression *call)
1475 {
1476         struct symbol *base_type;
1477         int loop_num_bak = loop_num;
1478         int loop_count_bak = loop_count;
1479         int final_pass_bak = final_pass;
1480         char *cur_func_bak = cur_func;
1481         struct statement_list *big_statement_stack_bak = big_statement_stack;
1482         struct expression_list *big_expression_stack_bak = big_expression_stack;
1483         struct expression_list *big_condition_stack_bak = big_condition_stack;
1484         struct expression_list *switch_expr_stack_bak = switch_expr_stack;
1485         struct symbol *cur_func_sym_bak = cur_func_sym;
1486
1487         __pass_to_client(call, INLINE_FN_START);
1488         final_pass = 0;  /* don't print anything */
1489         __inline_fn = call;
1490
1491         base_type = get_base_type(call->fn->symbol);
1492         cur_func_sym = call->fn->symbol;
1493         if (call->fn->symbol->ident)
1494                 cur_func = call->fn->symbol->ident->name;
1495         else
1496                 cur_func = NULL;
1497         set_position(call->fn->symbol->pos);
1498
1499         save_all_states();
1500         big_statement_stack = NULL;
1501         big_expression_stack = NULL;
1502         big_condition_stack = NULL;
1503         switch_expr_stack = NULL;
1504
1505         sm_debug("inline function:  %s\n", cur_func);
1506         __unnullify_path();
1507         loop_num = 0;
1508         start_function_definition(call->fn->symbol);
1509         __split_stmt(base_type->stmt);
1510         __split_stmt(base_type->inline_stmt);
1511         __pass_to_client(call->fn->symbol, END_FUNC_HOOK);
1512         __pass_to_client(call->fn->symbol, AFTER_FUNC_HOOK);
1513
1514         free_expression_stack(&switch_expr_stack);
1515         __free_ptr_list((struct ptr_list **)&big_statement_stack);
1516         nullify_path();
1517         free_goto_stack();
1518
1519         loop_num = loop_num_bak;
1520         loop_count = loop_count_bak;
1521         final_pass = final_pass_bak;
1522         cur_func_sym = cur_func_sym_bak;
1523         cur_func = cur_func_bak;
1524         big_statement_stack = big_statement_stack_bak;
1525         big_expression_stack = big_expression_stack_bak;
1526         big_condition_stack = big_condition_stack_bak;
1527         switch_expr_stack = switch_expr_stack_bak;
1528
1529         restore_all_states();
1530         set_position(call->pos);
1531         __inline_fn = NULL;
1532         __pass_to_client(call, INLINE_FN_END);
1533 }
1534
1535 static struct symbol_list *inlines_called;
1536 static void add_inline_function(struct symbol *sym)
1537 {
1538         static struct symbol_list *already_added;
1539         struct symbol *tmp;
1540
1541         FOR_EACH_PTR(already_added, tmp) {
1542                 if (tmp == sym)
1543                         return;
1544         } END_FOR_EACH_PTR(tmp);
1545
1546         add_ptr_list(&already_added, sym);
1547         add_ptr_list(&inlines_called, sym);
1548 }
1549
1550 static void process_inlines(void)
1551 {
1552         struct symbol *tmp;
1553
1554         FOR_EACH_PTR(inlines_called, tmp) {
1555                 split_function(tmp);
1556         } END_FOR_EACH_PTR(tmp);
1557         free_ptr_list(&inlines_called);
1558 }
1559
1560 static struct symbol *get_last_scoped_symbol(struct symbol_list *big_list, int use_static)
1561 {
1562         struct symbol *sym;
1563
1564         FOR_EACH_PTR_REVERSE(big_list, sym) {
1565                 if (!sym->scope)
1566                         continue;
1567                 if (use_static && sym->ctype.modifiers & MOD_STATIC)
1568                         return sym;
1569                 if (!use_static && !(sym->ctype.modifiers & MOD_STATIC))
1570                         return sym;
1571         } END_FOR_EACH_PTR_REVERSE(sym);
1572
1573         return NULL;
1574 }
1575
1576 static void split_inlines_in_scope(struct symbol *sym)
1577 {
1578         struct symbol *base;
1579         struct symbol_list *scope_list;
1580         int stream;
1581
1582         scope_list = sym->scope->symbols;
1583         stream = sym->pos.stream;
1584
1585         /* find the last static symbol in the file */
1586         FOR_EACH_PTR_REVERSE(scope_list, sym) {
1587                 if (sym->pos.stream != stream)
1588                         continue;
1589                 if (sym->type != SYM_NODE)
1590                         continue;
1591                 base = get_base_type(sym);
1592                 if (!base)
1593                         continue;
1594                 if (base->type != SYM_FN)
1595                         continue;
1596                 if (!base->inline_stmt)
1597                         continue;
1598                 add_inline_function(sym);
1599         } END_FOR_EACH_PTR_REVERSE(sym);
1600
1601         process_inlines();
1602 }
1603
1604 static void split_inlines(struct symbol_list *sym_list)
1605 {
1606         struct symbol *sym;
1607
1608         sym = get_last_scoped_symbol(sym_list, 0);
1609         if (sym)
1610                 split_inlines_in_scope(sym);
1611         sym = get_last_scoped_symbol(sym_list, 1);
1612         if (sym)
1613                 split_inlines_in_scope(sym);
1614 }
1615
1616 static struct stree *clone_estates_perm(struct stree *orig)
1617 {
1618         struct stree *ret = NULL;
1619         struct sm_state *tmp;
1620
1621         FOR_EACH_SM(orig, tmp) {
1622                 set_state_stree_perm(&ret, tmp->owner, tmp->name, tmp->sym, clone_estate_perm(tmp->state));
1623         } END_FOR_EACH_SM(tmp);
1624
1625         return ret;
1626 }
1627
1628 struct position last_pos;
1629 static void split_functions(struct symbol_list *sym_list)
1630 {
1631         struct symbol *sym;
1632
1633         __unnullify_path();
1634         FOR_EACH_PTR(sym_list, sym) {
1635                 set_position(sym->pos);
1636                 if (sym->type != SYM_NODE || get_base_type(sym)->type != SYM_FN) {
1637                         __pass_to_client(sym, BASE_HOOK);
1638                         fake_global_assign(sym);
1639                 }
1640         } END_FOR_EACH_PTR(sym);
1641         global_states = clone_estates_perm(get_all_states_stree(SMATCH_EXTRA));
1642         nullify_path();
1643
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                         split_function(sym);
1648                         process_inlines();
1649                 }
1650                 last_pos = sym->pos;
1651         } END_FOR_EACH_PTR(sym);
1652         split_inlines(sym_list);
1653         __pass_to_client(sym_list, END_FILE_HOOK);
1654 }
1655
1656 void smatch(int argc, char **argv)
1657 {
1658         struct string_list *filelist = NULL;
1659         struct symbol_list *sym_list;
1660         struct timeval stop, start;
1661
1662         gettimeofday(&start, NULL);
1663
1664         if (argc < 2) {
1665                 printf("Usage:  smatch [--debug] <filename.c>\n");
1666                 exit(1);
1667         }
1668         sparse_initialize(argc, argv, &filelist);
1669         set_valid_ptr_max();
1670         FOR_EACH_PTR_NOTAG(filelist, base_file) {
1671                 if (option_file_output) {
1672                         char buf[256];
1673
1674                         snprintf(buf, sizeof(buf), "%s.smatch", base_file);
1675                         sm_outfd = fopen(buf, "w");
1676                         if (!sm_outfd) {
1677                                 printf("Error:  Cannot open %s\n", base_file);
1678                                 exit(1);
1679                         }
1680                 }
1681                 sym_list = sparse_keep_tokens(base_file);
1682                 split_functions(sym_list);
1683         } END_FOR_EACH_PTR_NOTAG(base_file);
1684
1685         gettimeofday(&stop, NULL);
1686
1687         set_position(last_pos);
1688         if (option_time)
1689                 sm_msg("time: %lu", stop.tv_sec - start.tv_sec);
1690 }