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);
  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_known_conditions = 0;
  70 int option_two_passes = 0;
  71 struct symbol *cur_func_sym = NULL;
  72 struct stree *global_states;
  73
  74 long long valid_ptr_min = 4096;
  75 long long valid_ptr_max = 2117777777;
  76 sval_t valid_ptr_min_sval = {
  77         .type = &ptr_ctype,
  78         {.value = 4096},
  79 };
  80 sval_t valid_ptr_max_sval = {
  81         .type = &ptr_ctype,
  82         {.value = LONG_MAX - 100000},
  83 };
  84
  85 static void set_valid_ptr_max(void)
  86 {
  87         if (type_bits(&ptr_ctype) == 32)
  88                 valid_ptr_max = 2117777777;
  89         else if (type_bits(&ptr_ctype) == 64)
  90                 valid_ptr_max = 2117777777777777777LL;
  91
  92         valid_ptr_max_sval.value = valid_ptr_max;
  93 }
  94
  95 int outside_of_function(void)
  96 {
  97         return cur_func_sym == NULL;
  98 }
  99
 100 const char *get_filename(void)
 101 {
 102         if (option_info)
 103                 return base_file;
 104         if (option_full_path)
 105                 return full_filename;
 106         return filename;
 107 }
 108
 109 const char *get_base_file(void)
 110 {
 111         return base_file;
 112 }
 113
 114 static void set_position(struct position pos)
 115 {
 116         int len;
 117         static int prev_stream = -1;
 118
 119         if (pos.stream == 0 && pos.line == 0)
 120                 return;
 121
 122         __smatch_lineno = pos.line;
 123
 124         if (pos.stream == prev_stream)
 125                 return;
 126
 127         filename = stream_name(pos.stream);
 128
 129         free(full_filename);
 130         pathname = getcwd(NULL, 0);
 131         if (pathname) {
 132                 len = strlen(pathname) + 1 + strlen(filename) + 1;
 133                 full_filename = malloc(len);
 134                 snprintf(full_filename, len, "%s/%s", pathname, filename);
 135         } else {
 136                 full_filename = alloc_string(filename);
 137         }
 138         free(pathname);
 139 }
 140
 141 int is_assigned_call(struct expression *expr)
 142 {
 143         struct expression *tmp;
 144
 145         FOR_EACH_PTR_REVERSE(big_expression_stack, tmp) {
 146                 if (tmp->type == EXPR_ASSIGNMENT && tmp->op == '=' &&
 147                     strip_expr(tmp->right) == expr)
 148                         return 1;
 149                 if (tmp->pos.line < expr->pos.line)
 150                         return 0;
 151         } END_FOR_EACH_PTR_REVERSE(tmp);
 152         return 0;
 153 }
 154
 155 static int is_inline_func(struct expression *expr)
 156 {
 157         if (expr->type != EXPR_SYMBOL || !expr->symbol)
 158                 return 0;
 159         if (expr->symbol->ctype.modifiers & MOD_INLINE)
 160                 return 1;
 161         return 0;
 162 }
 163
 164 static int is_noreturn_func(struct expression *expr)
 165 {
 166         if (expr->type != EXPR_SYMBOL || !expr->symbol)
 167                 return 0;
 168         if (expr->symbol->ctype.modifiers & MOD_NORETURN)
 169                 return 1;
 170         return 0;
 171 }
 172
 173 int inlinable(struct expression *expr)
 174 {
 175         struct symbol *sym;
 176         struct statement *last_stmt = NULL;
 177
 178         if (__inline_fn)  /* don't nest */
 179                 return 0;
 180
 181         if (expr->type != EXPR_SYMBOL || !expr->symbol)
 182                 return 0;
 183         if (is_no_inline_function(expr->symbol->ident->name))
 184                 return 0;
 185         sym = get_base_type(expr->symbol);
 186         if (sym->stmt && sym->stmt->type == STMT_COMPOUND) {
 187                 if (ptr_list_size((struct ptr_list *)sym->stmt->stmts) > 10)
 188                         return 0;
 189                 if (sym->stmt->type != STMT_COMPOUND)
 190                         return 0;
 191                 last_stmt = last_ptr_list((struct ptr_list *)sym->stmt->stmts);
 192         }
 193         if (sym->inline_stmt && sym->inline_stmt->type == STMT_COMPOUND) {
 194                 if (ptr_list_size((struct ptr_list *)sym->inline_stmt->stmts) > 10)
 195                         return 0;
 196                 if (sym->inline_stmt->type != STMT_COMPOUND)
 197                         return 0;
 198                 last_stmt = last_ptr_list((struct ptr_list *)sym->inline_stmt->stmts);
 199         }
 200
 201         if (!last_stmt)
 202                 return 0;
 203
 204         /* the magic numbers in this function are pulled out of my bum. */
 205         if (last_stmt->pos.line > sym->pos.line + 20)
 206                 return 0;
 207
 208         return 1;
 209 }
 210
 211 void __process_post_op_stack(void)
 212 {
 213         struct expression *expr;
 214
 215         FOR_EACH_PTR(post_op_stack, expr) {
 216                 __pass_to_client(expr, OP_HOOK);
 217         } END_FOR_EACH_PTR(expr);
 218
 219         __free_ptr_list((struct ptr_list **)&post_op_stack);
 220 }
 221
 222 static int handle_comma_assigns(struct expression *expr)
 223 {
 224         struct expression *right;
 225         struct expression *assign;
 226
 227         right = strip_expr(expr->right);
 228         if (right->type != EXPR_COMMA)
 229                 return 0;
 230
 231         __split_expr(right->left);
 232         __process_post_op_stack();
 233
 234         assign = assign_expression(expr->left, right->right);
 235         __split_expr(assign);
 236
 237         return 1;
 238 }
 239
 240 void __split_expr(struct expression *expr)
 241 {
 242         if (!expr)
 243                 return;
 244
 245         // sm_msg(" Debug expr_type %d %s", expr->type, show_special(expr->op));
 246
 247         if (__in_fake_assign && expr->type != EXPR_ASSIGNMENT)
 248                 return;
 249         if (__in_fake_assign >= 4)  /* don't allow too much nesting */
 250                 return;
 251
 252         push_expression(&big_expression_stack, expr);
 253         set_position(expr->pos);
 254         __pass_to_client(expr, EXPR_HOOK);
 255
 256         switch (expr->type) {
 257         case EXPR_PREOP:
 258                 if (expr->op == '*')
 259                         __pass_to_client(expr, DEREF_HOOK);
 260                 __split_expr(expr->unop);
 261                 __pass_to_client(expr, OP_HOOK);
 262                 break;
 263         case EXPR_POSTOP:
 264                 __split_expr(expr->unop);
 265                 push_expression(&post_op_stack, expr);
 266                 break;
 267         case EXPR_STATEMENT:
 268                 __expr_stmt_count++;
 269                 __split_stmt(expr->statement);
 270                 __expr_stmt_count--;
 271                 break;
 272         case EXPR_LOGICAL:
 273         case EXPR_COMPARE:
 274                 __pass_to_client(expr, LOGIC_HOOK);
 275                 __handle_logic(expr);
 276                 break;
 277         case EXPR_BINOP:
 278                 __pass_to_client(expr, BINOP_HOOK);
 279         case EXPR_COMMA:
 280                 __split_expr(expr->left);
 281                 __process_post_op_stack();
 282                 __split_expr(expr->right);
 283                 break;
 284         case EXPR_ASSIGNMENT: {
 285                 struct expression *tmp;
 286
 287                 if (!expr->right)
 288                         break;
 289
 290                 __pass_to_client(expr, RAW_ASSIGNMENT_HOOK);
 291
 292                 /* foo = !bar() */
 293                 if (__handle_condition_assigns(expr))
 294                         break;
 295                 /* foo = (x < 5 ? foo : 5); */
 296                 if (__handle_select_assigns(expr))
 297                         break;
 298                 /* foo = ({frob(); frob(); frob(); 1;}) */
 299                 if (__handle_expr_statement_assigns(expr))
 300                         break;
 301                 /* foo = (3, 4); */
 302                 if (handle_comma_assigns(expr))
 303                         break;
 304
 305                 __split_expr(expr->right);
 306                 if (outside_of_function())
 307                         __pass_to_client(expr, GLOBAL_ASSIGNMENT_HOOK);
 308                 else
 309                         __pass_to_client(expr, ASSIGNMENT_HOOK);
 310
 311                 __fake_struct_member_assignments(expr);
 312
 313                 tmp = strip_expr(expr->right);
 314                 if (expr->op == '=' && tmp->type == EXPR_CALL) {
 315                         __pass_to_client(expr, CALL_ASSIGNMENT_HOOK);
 316                         if (!is_fake_call(tmp))
 317                                 __pass_to_client(tmp, FUNCTION_CALL_HOOK_AFTER);
 318                 }
 319                 if (get_macro_name(tmp->pos) &&
 320                     get_macro_name(expr->pos) != get_macro_name(tmp->pos))
 321                         __pass_to_client(expr, MACRO_ASSIGNMENT_HOOK);
 322                 __split_expr(expr->left);
 323                 break;
 324         }
 325         case EXPR_DEREF:
 326                 __pass_to_client(expr, DEREF_HOOK);
 327                 __split_expr(expr->deref);
 328                 break;
 329         case EXPR_SLICE:
 330                 __split_expr(expr->base);
 331                 break;
 332         case EXPR_CAST:
 333         case EXPR_FORCE_CAST:
 334                 __pass_to_client(expr, CAST_HOOK);
 335                 __split_expr(expr->cast_expression);
 336                 break;
 337         case EXPR_SIZEOF:
 338                 if (expr->cast_expression)
 339                         __pass_to_client(strip_parens(expr->cast_expression),
 340                                          SIZEOF_HOOK);
 341                 break;
 342         case EXPR_OFFSETOF:
 343         case EXPR_ALIGNOF:
 344                 evaluate_expression(expr);
 345                 break;
 346         case EXPR_CONDITIONAL:
 347         case EXPR_SELECT:
 348                 if (known_condition_true(expr->conditional)) {
 349                         __split_expr(expr->cond_true);
 350                         break;
 351                 }
 352                 if (known_condition_false(expr->conditional)) {
 353                         __split_expr(expr->cond_false);
 354                         break;
 355                 }
 356                 __pass_to_client(expr, SELECT_HOOK);
 357                 __split_whole_condition(expr->conditional);
 358                 __split_expr(expr->cond_true);
 359                 __push_true_states();
 360                 __use_false_states();
 361                 __split_expr(expr->cond_false);
 362                 __merge_true_states();
 363                 break;
 364         case EXPR_CALL:
 365                 if (sym_name_is("__builtin_constant_p", expr->fn))
 366                         break;
 367                 split_expr_list(expr->args);
 368                 __split_expr(expr->fn);
 369                 if (is_inline_func(expr->fn))
 370                         add_inline_function(expr->fn->symbol);
 371                 if (inlinable(expr->fn))
 372                         __inline_call = 1;
 373                 __process_post_op_stack();
 374                 __pass_to_client(expr, FUNCTION_CALL_HOOK);
 375                 __inline_call = 0;
 376                 if (inlinable(expr->fn)) {
 377                         parse_inline(expr);
 378                 }
 379                 __pass_to_client(expr, CALL_HOOK_AFTER_INLINE);
 380                 if (!is_assigned_call(expr))
 381                         __pass_to_client(expr, FUNCTION_CALL_HOOK_AFTER);
 382                 if (is_noreturn_func(expr->fn))
 383                         nullify_path();
 384                 break;
 385         case EXPR_INITIALIZER:
 386                 split_expr_list(expr->expr_list);
 387                 break;
 388         case EXPR_IDENTIFIER:
 389                 __split_expr(expr->ident_expression);
 390                 break;
 391         case EXPR_INDEX:
 392                 __split_expr(expr->idx_expression);
 393                 break;
 394         case EXPR_POS:
 395                 __split_expr(expr->init_expr);
 396                 break;
 397         case EXPR_SYMBOL:
 398                 __pass_to_client(expr, SYM_HOOK);
 399                 break;
 400         case EXPR_STRING:
 401                 __pass_to_client(expr, STRING_HOOK);
 402                 break;
 403         default:
 404                 break;
 405         };
 406         pop_expression(&big_expression_stack);
 407 }
 408
 409 static int is_forever_loop(struct statement *stmt)
 410 {
 411         struct expression *expr;
 412
 413         expr = strip_expr(stmt->iterator_pre_condition);
 414         if (!expr)
 415                 expr = stmt->iterator_post_condition;
 416         if (!expr) {
 417                 /* this is a for(;;) loop... */
 418                 return 1;
 419         }
 420
 421         if (expr->type == EXPR_VALUE && expr->value == 1)
 422                 return 1;
 423
 424         return 0;
 425 }
 426
 427 static int loop_num;
 428 static char *get_loop_name(int num)
 429 {
 430         char buf[256];
 431
 432         snprintf(buf, 255, "-loop%d", num);
 433         buf[255] = '\0';
 434         return alloc_sname(buf);
 435 }
 436
 437 /*
 438  * Pre Loops are while and for loops.
 439  */
 440 static void handle_pre_loop(struct statement *stmt)
 441 {
 442         int once_through; /* we go through the loop at least once */
 443         struct sm_state *extra_sm = NULL;
 444         int unchanged = 0;
 445         char *loop_name;
 446         struct stree *stree = NULL;
 447         struct sm_state *sm = NULL;
 448
 449         loop_name = get_loop_name(loop_num);
 450         loop_num++;
 451
 452         __split_stmt(stmt->iterator_pre_statement);
 453
 454         once_through = implied_condition_true(stmt->iterator_pre_condition);
 455
 456         loop_count++;
 457         __push_continues();
 458         __push_breaks();
 459
 460         __merge_gotos(loop_name);
 461
 462         extra_sm = __extra_handle_canonical_loops(stmt, &stree);
 463         __in_pre_condition++;
 464         __pass_to_client(stmt, PRELOOP_HOOK);
 465         __split_whole_condition(stmt->iterator_pre_condition);
 466         __in_pre_condition--;
 467         FOR_EACH_SM(stree, sm) {
 468                 set_state(sm->owner, sm->name, sm->sym, sm->state);
 469         } END_FOR_EACH_SM(sm);
 470         free_stree(&stree);
 471         if (extra_sm)
 472                 extra_sm = get_sm_state(extra_sm->owner, extra_sm->name, extra_sm->sym);
 473
 474         if (option_assume_loops)
 475                 once_through = 1;
 476
 477         __split_stmt(stmt->iterator_statement);
 478         __warn_on_silly_pre_loops();
 479         if (is_forever_loop(stmt)) {
 480                 __merge_continues();
 481                 __save_gotos(loop_name);
 482
 483                 __push_fake_cur_stree();
 484                 __split_stmt(stmt->iterator_post_statement);
 485                 stree = __pop_fake_cur_stree();
 486
 487                 __discard_false_states();
 488                 __use_breaks();
 489
 490                 if (!__path_is_null())
 491                         __merge_stree_into_cur(stree);
 492                 free_stree(&stree);
 493         } else {
 494                 __merge_continues();
 495                 unchanged = __iterator_unchanged(extra_sm);
 496                 __split_stmt(stmt->iterator_post_statement);
 497                 __save_gotos(loop_name);
 498                 __in_pre_condition++;
 499                 __split_whole_condition(stmt->iterator_pre_condition);
 500                 __in_pre_condition--;
 501                 nullify_path();
 502                 __merge_false_states();
 503                 if (once_through)
 504                         __discard_false_states();
 505                 else
 506                         __merge_false_states();
 507
 508                 if (extra_sm && unchanged)
 509                         __extra_pre_loop_hook_after(extra_sm,
 510                                                 stmt->iterator_post_statement,
 511                                                 stmt->iterator_pre_condition);
 512                 __merge_breaks();
 513         }
 514         loop_count--;
 515 }
 516
 517 /*
 518  * Post loops are do {} while();
 519  */
 520 static void handle_post_loop(struct statement *stmt)
 521 {
 522         char *loop_name;
 523
 524         loop_name = get_loop_name(loop_num);
 525         loop_num++;
 526         loop_count++;
 527
 528         __push_continues();
 529         __push_breaks();
 530         __merge_gotos(loop_name);
 531         __split_stmt(stmt->iterator_statement);
 532         __merge_continues();
 533         if (!is_zero(stmt->iterator_post_condition))
 534                 __save_gotos(loop_name);
 535
 536         if (is_forever_loop(stmt)) {
 537                 __use_breaks();
 538         } else {
 539                 __split_whole_condition(stmt->iterator_post_condition);
 540                 __use_false_states();
 541                 __merge_breaks();
 542         }
 543         loop_count--;
 544 }
 545
 546 static int empty_statement(struct statement *stmt)
 547 {
 548         if (!stmt)
 549                 return 0;
 550         if (stmt->type == STMT_EXPRESSION && !stmt->expression)
 551                 return 1;
 552         return 0;
 553 }
 554
 555 static int last_stmt_on_same_line(void)
 556 {
 557         struct statement *stmt;
 558         int i = 0;
 559
 560         FOR_EACH_PTR_REVERSE(big_statement_stack, stmt) {
 561                 if (!i++)
 562                         continue;
 563                 if  (stmt->pos.line == get_lineno())
 564                         return 1;
 565                 return 0;
 566         } END_FOR_EACH_PTR_REVERSE(stmt);
 567         return 0;
 568 }
 569
 570 static void split_asm_constraints(struct expression_list *expr_list)
 571 {
 572         struct expression *expr;
 573         int state = 0;
 574
 575         FOR_EACH_PTR(expr_list, expr) {
 576                 switch (state) {
 577                 case 0: /* identifier */
 578                 case 1: /* constraint */
 579                         state++;
 580                         continue;
 581                 case 2: /* expression */
 582                         state = 0;
 583                         __split_expr(expr);
 584                         continue;
 585                 }
 586         } END_FOR_EACH_PTR(expr);
 587 }
 588
 589 static int is_case_val(struct statement *stmt, sval_t sval)
 590 {
 591         sval_t case_sval;
 592
 593         if (stmt->type != STMT_CASE)
 594                 return 0;
 595         if (!stmt->case_expression) {
 596                 __set_default();
 597                 return 1;
 598         }
 599         if (!get_value(stmt->case_expression, &case_sval))
 600                 return 0;
 601         if (case_sval.value == sval.value)
 602                 return 1;
 603         return 0;
 604 }
 605
 606 static void split_known_switch(struct statement *stmt, sval_t sval)
 607 {
 608         struct statement *tmp;
 609
 610         __split_expr(stmt->switch_expression);
 611
 612         push_expression(&switch_expr_stack, stmt->switch_expression);
 613         __save_switch_states(top_expression(switch_expr_stack));
 614         nullify_path();
 615         __push_default();
 616         __push_breaks();
 617
 618         stmt = stmt->switch_statement;
 619
 620         __push_scope_hooks();
 621         FOR_EACH_PTR(stmt->stmts, tmp) {
 622                 __smatch_lineno = tmp->pos.line;
 623                 if (is_case_val(tmp, sval)) {
 624                         __merge_switches(top_expression(switch_expr_stack),
 625                                          stmt->case_expression);
 626                         __pass_case_to_client(top_expression(switch_expr_stack),
 627                                               stmt->case_expression);
 628                 }
 629                 if (__path_is_null())
 630                         continue;
 631                 __split_stmt(tmp);
 632                 if (__path_is_null()) {
 633                         __set_default();
 634                         goto out;
 635                 }
 636         } END_FOR_EACH_PTR(tmp);
 637 out:
 638         __call_scope_hooks();
 639         if (!__pop_default())
 640                 __merge_switches(top_expression(switch_expr_stack),
 641                                  NULL);
 642         __discard_switches();
 643         __merge_breaks();
 644         pop_expression(&switch_expr_stack);
 645 }
 646
 647 static int taking_too_long(void)
 648 {
 649         int ms;
 650
 651         ms = ms_since(&fn_start_time);
 652         if (ms > 1000 * 60 * 5)  /* five minutes */
 653                 return 1;
 654         return 0;
 655 }
 656
 657 static int is_last_stmt(struct statement *cur_stmt)
 658 {
 659         struct symbol *fn = get_base_type(cur_func_sym);
 660         struct statement *stmt;
 661
 662         if (!fn)
 663                 return 0;
 664         stmt = fn->stmt;
 665         if (!stmt)
 666                 stmt = fn->inline_stmt;
 667         if (!stmt || stmt->type != STMT_COMPOUND)
 668                 return 0;
 669         stmt = last_ptr_list((struct ptr_list *)stmt->stmts);
 670         if (stmt && stmt->type == STMT_LABEL)
 671                 stmt = stmt->label_statement;
 672         if (stmt == cur_stmt)
 673                 return 1;
 674         return 0;
 675 }
 676
 677 static void handle_backward_goto(struct statement *goto_stmt)
 678 {
 679         const char *goto_name, *label_name;
 680         struct statement *func_stmt;
 681         struct symbol *base_type = get_base_type(cur_func_sym);
 682         struct statement *tmp;
 683         int found = 0;
 684
 685         if (!option_info)
 686                 return;
 687         if (last_goto_statement_handled)
 688                 return;
 689         last_goto_statement_handled = 1;
 690
 691         if (!goto_stmt->goto_label ||
 692             goto_stmt->goto_label->type != SYM_LABEL ||
 693             !goto_stmt->goto_label->ident)
 694                 return;
 695         goto_name = goto_stmt->goto_label->ident->name;
 696
 697         func_stmt = base_type->stmt;
 698         if (!func_stmt)
 699                 func_stmt = base_type->inline_stmt;
 700         if (!func_stmt)
 701                 return;
 702         if (func_stmt->type != STMT_COMPOUND)
 703                 return;
 704
 705         FOR_EACH_PTR(func_stmt->stmts, tmp) {
 706                 if (!found) {
 707                         if (tmp->type != STMT_LABEL)
 708                                 continue;
 709                         if (!tmp->label_identifier ||
 710                             tmp->label_identifier->type != SYM_LABEL ||
 711                             !tmp->label_identifier->ident)
 712                                 continue;
 713                         label_name = tmp->label_identifier->ident->name;
 714                         if (strcmp(goto_name, label_name) != 0)
 715                                 continue;
 716                         found = 1;
 717                 }
 718                 __split_stmt(tmp);
 719         } END_FOR_EACH_PTR(tmp);
 720 }
 721
 722 static void fake_a_return(void)
 723 {
 724         struct symbol *return_type;
 725
 726         nullify_path();
 727         __unnullify_path();
 728
 729         return_type = get_real_base_type(cur_func_sym);
 730         return_type = get_real_base_type(return_type);
 731         if (return_type != &void_ctype) {
 732                 __pass_to_client(unknown_value_expression(NULL), RETURN_HOOK);
 733                 nullify_path();
 734         }
 735
 736         __pass_to_client(cur_func_sym, END_FUNC_HOOK);
 737         __pass_to_client(cur_func_sym, AFTER_FUNC_HOOK);
 738 }
 739
 740 static void split_compound(struct statement *stmt)
 741 {
 742         struct statement *prev = NULL;
 743         struct statement *cur = NULL;
 744         struct statement *next;
 745
 746         __push_scope_hooks();
 747
 748         FOR_EACH_PTR(stmt->stmts, next) {
 749                 if (cur) {
 750                         __prev_stmt = prev;
 751                         __next_stmt = next;
 752                         __cur_stmt = cur;
 753                         __split_stmt(cur);
 754                 }
 755                 prev = cur;
 756                 cur = next;
 757         } END_FOR_EACH_PTR(next);
 758         if (cur) {
 759                 __prev_stmt = prev;
 760                 __cur_stmt = cur;
 761                 __next_stmt = NULL;
 762                 __split_stmt(cur);
 763         }
 764
 765         __call_scope_hooks();
 766 }
 767
 768 void __split_stmt(struct statement *stmt)
 769 {
 770         sval_t sval;
 771
 772         if (!stmt)
 773                 goto out;
 774
 775         if (__bail_on_rest_of_function || out_of_memory() || taking_too_long()) {
 776                 static char *printed = NULL;
 777
 778                 __bail_on_rest_of_function = 1;
 779                 if (printed != cur_func)
 780                         sm_msg("Function too hairy.  Giving up.");
 781                 fake_a_return();
 782                 final_pass = 0;  /* turn off sm_msg() from here */
 783                 printed = cur_func;
 784                 return;
 785         }
 786
 787         add_ptr_list(&big_statement_stack, stmt);
 788         free_expression_stack(&big_expression_stack);
 789         set_position(stmt->pos);
 790         __pass_to_client(stmt, STMT_HOOK);
 791
 792         switch (stmt->type) {
 793         case STMT_DECLARATION:
 794                 split_declaration(stmt->declaration);
 795                 break;
 796         case STMT_RETURN:
 797                 __split_expr(stmt->ret_value);
 798                 __pass_to_client(stmt->ret_value, RETURN_HOOK);
 799                 __process_post_op_stack();
 800                 nullify_path();
 801                 break;
 802         case STMT_EXPRESSION:
 803                 __split_expr(stmt->expression);
 804                 break;
 805         case STMT_COMPOUND:
 806                 split_compound(stmt);
 807                 break;
 808         case STMT_IF:
 809                 if (known_condition_true(stmt->if_conditional)) {
 810                         __split_stmt(stmt->if_true);
 811                         break;
 812                 }
 813                 if (known_condition_false(stmt->if_conditional)) {
 814                         __split_stmt(stmt->if_false);
 815                         break;
 816                 }
 817                 if (option_known_conditions &&
 818                     implied_condition_true(stmt->if_conditional)) {
 819                         sm_info("this condition is true.");
 820                         __split_stmt(stmt->if_true);
 821                         break;
 822                 }
 823                 if (option_known_conditions &&
 824                     implied_condition_false(stmt->if_conditional)) {
 825                         sm_info("this condition is false.");
 826                         __split_stmt(stmt->if_false);
 827                         break;
 828                 }
 829                 __split_whole_condition(stmt->if_conditional);
 830                 __split_stmt(stmt->if_true);
 831                 if (empty_statement(stmt->if_true) &&
 832                         last_stmt_on_same_line() &&
 833                         !get_macro_name(stmt->if_true->pos))
 834                         sm_msg("warn: if();");
 835                 __push_true_states();
 836                 __use_false_states();
 837                 __split_stmt(stmt->if_false);
 838                 __merge_true_states();
 839                 break;
 840         case STMT_ITERATOR:
 841                 if (stmt->iterator_pre_condition)
 842                         handle_pre_loop(stmt);
 843                 else if (stmt->iterator_post_condition)
 844                         handle_post_loop(stmt);
 845                 else {
 846                         // these are for(;;) type loops.
 847                         handle_pre_loop(stmt);
 848                 }
 849                 break;
 850         case STMT_SWITCH:
 851                 if (get_value(stmt->switch_expression, &sval)) {
 852                         split_known_switch(stmt, sval);
 853                         break;
 854                 }
 855                 __split_expr(stmt->switch_expression);
 856                 push_expression(&switch_expr_stack, stmt->switch_expression);
 857                 __save_switch_states(top_expression(switch_expr_stack));
 858                 nullify_path();
 859                 __push_default();
 860                 __push_breaks();
 861                 __split_stmt(stmt->switch_statement);
 862                 if (!__pop_default())
 863                         __merge_switches(top_expression(switch_expr_stack),
 864                                       NULL);
 865                 __discard_switches();
 866                 __merge_breaks();
 867                 pop_expression(&switch_expr_stack);
 868                 break;
 869         case STMT_CASE:
 870                 __merge_switches(top_expression(switch_expr_stack),
 871                                       stmt->case_expression);
 872                 __pass_case_to_client(top_expression(switch_expr_stack),
 873                                       stmt->case_expression);
 874                 if (!stmt->case_expression)
 875                         __set_default();
 876                 __split_expr(stmt->case_expression);
 877                 __split_expr(stmt->case_to);
 878                 __split_stmt(stmt->case_statement);
 879                 break;
 880         case STMT_LABEL:
 881                 if (stmt->label_identifier &&
 882                     stmt->label_identifier->type == SYM_LABEL &&
 883                     stmt->label_identifier->ident) {
 884                         loop_count |= 0x80000000;
 885                         __merge_gotos(stmt->label_identifier->ident->name);
 886                 }
 887                 __split_stmt(stmt->label_statement);
 888                 break;
 889         case STMT_GOTO:
 890                 __split_expr(stmt->goto_expression);
 891                 if (stmt->goto_label && stmt->goto_label->type == SYM_NODE) {
 892                         if (!strcmp(stmt->goto_label->ident->name, "break")) {
 893                                 __process_breaks();
 894                         } else if (!strcmp(stmt->goto_label->ident->name,
 895                                            "continue")) {
 896                                 __process_continues();
 897                         }
 898                 } else if (stmt->goto_label &&
 899                            stmt->goto_label->type == SYM_LABEL &&
 900                            stmt->goto_label->ident) {
 901                         __save_gotos(stmt->goto_label->ident->name);
 902                 }
 903                 nullify_path();
 904                 if (is_last_stmt(stmt))
 905                         handle_backward_goto(stmt);
 906                 break;
 907         case STMT_NONE:
 908                 break;
 909         case STMT_ASM:
 910                 __pass_to_client(stmt, ASM_HOOK);
 911                 __split_expr(stmt->asm_string);
 912                 split_asm_constraints(stmt->asm_outputs);
 913                 split_asm_constraints(stmt->asm_inputs);
 914                 split_asm_constraints(stmt->asm_clobbers);
 915                 break;
 916         case STMT_CONTEXT:
 917                 break;
 918         case STMT_RANGE:
 919                 __split_expr(stmt->range_expression);
 920                 __split_expr(stmt->range_low);
 921                 __split_expr(stmt->range_high);
 922                 break;
 923         }
 924         __pass_to_client(stmt, STMT_HOOK_AFTER);
 925 out:
 926         __process_post_op_stack();
 927 }
 928
 929 static void split_expr_list(struct expression_list *expr_list)
 930 {
 931         struct expression *expr;
 932
 933         FOR_EACH_PTR(expr_list, expr) {
 934                 __split_expr(expr);
 935                 __process_post_op_stack();
 936         } END_FOR_EACH_PTR(expr);
 937 }
 938
 939 static void split_sym(struct symbol *sym)
 940 {
 941         if (!sym)
 942                 return;
 943         if (!(sym->namespace & NS_SYMBOL))
 944                 return;
 945
 946         __split_stmt(sym->stmt);
 947         __split_expr(sym->array_size);
 948         split_symlist(sym->arguments);
 949         split_symlist(sym->symbol_list);
 950         __split_stmt(sym->inline_stmt);
 951         split_symlist(sym->inline_symbol_list);
 952 }
 953
 954 static void split_symlist(struct symbol_list *sym_list)
 955 {
 956         struct symbol *sym;
 957
 958         FOR_EACH_PTR(sym_list, sym) {
 959                 split_sym(sym);
 960         } END_FOR_EACH_PTR(sym);
 961 }
 962
 963 typedef void (fake_cb)(struct expression *expr);
 964
 965 static int member_to_number(struct expression *expr, struct ident *member)
 966 {
 967         struct symbol *type, *tmp;
 968         char *name;
 969         int i;
 970
 971         if (!member)
 972                 return -1;
 973         name = member->name;
 974
 975         type = get_type(expr);
 976         if (!type || type->type != SYM_STRUCT)
 977                 return -1;
 978
 979         i = -1;
 980         FOR_EACH_PTR(type->symbol_list, tmp) {
 981                 i++;
 982                 if (!tmp->ident)
 983                         continue;
 984                 if (strcmp(name, tmp->ident->name) == 0)
 985                         return i;
 986         } END_FOR_EACH_PTR(tmp);
 987         return -1;
 988 }
 989
 990 static struct ident *number_to_member(struct expression *expr, int num)
 991 {
 992         struct symbol *type, *member;
 993         int i = 0;
 994
 995         type = get_type(expr);
 996         if (!type || type->type != SYM_STRUCT)
 997                 return NULL;
 998
 999         FOR_EACH_PTR(type->symbol_list, member) {
1000                 if (i == num)
1001                         return member->ident;
1002                 i++;
1003         } END_FOR_EACH_PTR(member);
1004         return NULL;
1005 }
1006
1007 static void fake_element_assigns_helper(struct expression *array, struct expression_list *expr_list, fake_cb *fake_cb);
1008
1009 struct member_set {
1010         struct ident *ident;
1011         int set;
1012 };
1013
1014 static struct member_set *alloc_member_set(struct symbol *type)
1015 {
1016         struct member_set *member_set;
1017         struct symbol *member;
1018         int member_count;
1019         int member_idx;
1020
1021         member_count = ptr_list_size((struct ptr_list *)type->symbol_list);
1022         member_set = malloc(member_count * sizeof(*member_set));
1023         member_idx = 0;
1024         FOR_EACH_PTR(type->symbol_list, member) {
1025                 member_set[member_idx].ident = member->ident;
1026                 member_set[member_idx].set = 0;
1027                 member_idx++;
1028         } END_FOR_EACH_PTR(member);
1029
1030         return member_set;
1031 }
1032
1033 static void mark_member_as_set(struct symbol *type, struct member_set *member_set, struct ident *ident)
1034 {
1035         int member_count = ptr_list_size((struct ptr_list *)type->symbol_list);
1036         int i;
1037
1038         for (i = 0; i < member_count; i++) {
1039                 if (member_set[i].ident == ident) {
1040                         member_set[i].set = 1;
1041                         return;
1042                 }
1043         }
1044 //      crap.  this is buggy.
1045 //      sm_msg("internal smatch error in initializer %s.%s", type->ident->name, ident->name);
1046 }
1047
1048 static void set_unset_to_zero(struct expression *symbol, struct symbol *type, struct member_set *member_set)
1049 {
1050         struct expression *deref, *assign;
1051         struct symbol *member, *member_type;
1052         int member_idx;
1053
1054         member_idx = 0;
1055         FOR_EACH_PTR(type->symbol_list, member) {
1056                 if (!member->ident || member_set[member_idx].set) {
1057                         member_idx++;
1058                         continue;
1059                 }
1060                 member_type = get_real_base_type(member);
1061                 if (!member_type || member_type->type == SYM_ARRAY) {
1062                         member_idx++;
1063                         continue;
1064                 }
1065                 /* TODO: this should be handled recursively and not ignored */
1066                 if (member_type->type == SYM_STRUCT || member_type->type == SYM_UNION) {
1067                         member_idx++;
1068                         continue;
1069                 }
1070                 deref = member_expression(symbol, '.', member->ident);
1071                 assign = assign_expression(deref, zero_expr());
1072                 __split_expr(assign);
1073                 member_idx++;
1074         } END_FOR_EACH_PTR(member);
1075
1076 }
1077
1078 static void fake_member_assigns_helper(struct expression *symbol, struct expression_list *members, fake_cb *fake_cb)
1079 {
1080         struct expression *deref, *assign, *tmp;
1081         struct symbol *struct_type, *type;
1082         struct ident *member;
1083         int member_idx;
1084         struct member_set *member_set;
1085
1086         struct_type = get_type(symbol);
1087         if (!struct_type ||
1088             (struct_type->type != SYM_STRUCT && struct_type->type != SYM_UNION))
1089                 return;
1090
1091         member_set = alloc_member_set(struct_type);
1092
1093         member_idx = 0;
1094         FOR_EACH_PTR(members, tmp) {
1095                 member = number_to_member(symbol, member_idx);
1096                 while (tmp->type == EXPR_IDENTIFIER) {
1097                         member = tmp->expr_ident;
1098                         member_idx = member_to_number(symbol, member);
1099                         tmp = tmp->ident_expression;
1100                 }
1101                 mark_member_as_set(struct_type, member_set, member);
1102                 member_idx++;
1103                 deref = member_expression(symbol, '.', member);
1104                 if (tmp->type == EXPR_INITIALIZER) {
1105                         type = get_type(deref);
1106                         if (type && type->type == SYM_ARRAY)
1107                                 fake_element_assigns_helper(deref, tmp->expr_list, fake_cb);
1108                         else
1109                                 fake_member_assigns_helper(deref, tmp->expr_list, fake_cb);
1110                 } else {
1111                         assign = assign_expression(deref, tmp);
1112                         fake_cb(assign);
1113                 }
1114         } END_FOR_EACH_PTR(tmp);
1115
1116         set_unset_to_zero(symbol, struct_type, member_set);
1117 }
1118
1119 static void fake_member_assigns(struct symbol *sym, fake_cb *fake_cb)
1120 {
1121         fake_member_assigns_helper(symbol_expression(sym),
1122                                    sym->initializer->expr_list, fake_cb);
1123 }
1124
1125 static void fake_element_assigns_helper(struct expression *array, struct expression_list *expr_list, fake_cb *fake_cb)
1126 {
1127         struct expression *offset, *binop, *assign, *tmp;
1128         struct symbol *type;
1129         int idx;
1130
1131         idx = 0;
1132         FOR_EACH_PTR(expr_list, tmp) {
1133                 if (tmp->type == EXPR_INDEX) {
1134                         if (tmp->idx_from != tmp->idx_to)
1135                                 return;
1136                         idx = tmp->idx_from;
1137                         if (!tmp->idx_expression)
1138                                 goto next;
1139                         tmp = tmp->idx_expression;
1140                 }
1141                 offset = value_expr(idx);
1142                 binop = array_element_expression(array, offset);
1143                 if (tmp->type == EXPR_INITIALIZER) {
1144                         type = get_type(binop);
1145                         if (type && type->type == SYM_ARRAY)
1146                                 fake_element_assigns_helper(binop, tmp->expr_list, fake_cb);
1147                         else
1148                                 fake_member_assigns_helper(binop, tmp->expr_list, fake_cb);
1149                 } else {
1150                         assign = assign_expression(binop, tmp);
1151                         fake_cb(assign);
1152                 }
1153 next:
1154                 idx++;
1155         } END_FOR_EACH_PTR(tmp);
1156 }
1157
1158 static void fake_element_assigns(struct symbol *sym, fake_cb *fake_cb)
1159 {
1160         fake_element_assigns_helper(symbol_expression(sym), sym->initializer->expr_list, fake_cb);
1161 }
1162
1163 static void fake_assign_expr(struct symbol *sym)
1164 {
1165         struct expression *assign, *symbol;
1166
1167         symbol = symbol_expression(sym);
1168         assign = assign_expression(symbol, sym->initializer);
1169         __split_expr(assign);
1170 }
1171
1172 static void call_split_expr(struct expression *expr)
1173 {
1174         __split_expr(expr);
1175 }
1176
1177 static void do_initializer_stuff(struct symbol *sym)
1178 {
1179         if (!sym->initializer)
1180                 return;
1181
1182         if (sym->initializer->type == EXPR_INITIALIZER) {
1183                 if (get_real_base_type(sym)->type == SYM_ARRAY)
1184                         fake_element_assigns(sym, call_split_expr);
1185                 else
1186                         fake_member_assigns(sym, call_split_expr);
1187         } else {
1188                 fake_assign_expr(sym);
1189         }
1190 }
1191
1192 static void split_declaration(struct symbol_list *sym_list)
1193 {
1194         struct symbol *sym;
1195
1196         FOR_EACH_PTR(sym_list, sym) {
1197                 __pass_to_client(sym, DECLARATION_HOOK);
1198                 do_initializer_stuff(sym);
1199                 split_sym(sym);
1200         } END_FOR_EACH_PTR(sym);
1201 }
1202
1203 static void call_global_assign_hooks(struct expression *assign)
1204 {
1205         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1206 }
1207
1208 static void fake_global_assign(struct symbol *sym)
1209 {
1210         struct expression *assign, *symbol;
1211
1212         if (get_real_base_type(sym)->type == SYM_ARRAY) {
1213                 if (sym->initializer && sym->initializer->type == EXPR_INITIALIZER) {
1214                         fake_element_assigns(sym, call_global_assign_hooks);
1215                 } else if (sym->initializer) {
1216                         symbol = symbol_expression(sym);
1217                         assign = assign_expression(symbol, sym->initializer);
1218                         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1219                 } else {
1220                         fake_element_assigns_helper(symbol_expression(sym), NULL, call_global_assign_hooks);
1221                 }
1222         } else if (get_real_base_type(sym)->type == SYM_STRUCT) {
1223                 if (sym->initializer && sym->initializer->type == EXPR_INITIALIZER) {
1224                         fake_member_assigns(sym, call_global_assign_hooks);
1225                 } else if (sym->initializer) {
1226                         symbol = symbol_expression(sym);
1227                         assign = assign_expression(symbol, sym->initializer);
1228                         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1229                 } else {
1230                         fake_member_assigns_helper(symbol_expression(sym), NULL, call_global_assign_hooks);
1231                 }
1232         } else {
1233                 symbol = symbol_expression(sym);
1234                 if (sym->initializer)
1235                         assign = assign_expression(symbol, sym->initializer);
1236                 else
1237                         assign = assign_expression(symbol, zero_expr());
1238                 __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1239         }
1240 }
1241
1242 static void start_function_definition(struct symbol *sym)
1243 {
1244         __in_function_def = 1;
1245         __pass_to_client(sym, FUNC_DEF_HOOK);
1246         __in_function_def = 0;
1247         __pass_to_client(sym, AFTER_DEF_HOOK);
1248
1249 }
1250
1251 static void split_function(struct symbol *sym)
1252 {
1253         struct symbol *base_type = get_base_type(sym);
1254
1255         if (!base_type->stmt && !base_type->inline_stmt)
1256                 return;
1257
1258         gettimeofday(&fn_start_time, NULL);
1259         cur_func_sym = sym;
1260         if (sym->ident)
1261                 cur_func = sym->ident->name;
1262         __smatch_lineno = sym->pos.line;
1263         loop_count = 0;
1264         last_goto_statement_handled = 0;
1265         sm_debug("new function:  %s\n", cur_func);
1266         __stree_id = 0;
1267         if (option_two_passes) {
1268                 __unnullify_path();
1269                 loop_num = 0;
1270                 final_pass = 0;
1271                 start_function_definition(sym);
1272                 __split_stmt(base_type->stmt);
1273                 __split_stmt(base_type->inline_stmt);
1274                 nullify_path();
1275         }
1276         __unnullify_path();
1277         loop_num = 0;
1278         final_pass = 1;
1279         start_function_definition(sym);
1280         __split_stmt(base_type->stmt);
1281         __split_stmt(base_type->inline_stmt);
1282         __pass_to_client(sym, END_FUNC_HOOK);
1283         __pass_to_client(sym, AFTER_FUNC_HOOK);
1284
1285         clear_all_states();
1286         cur_func_sym = NULL;
1287         cur_func = NULL;
1288         free_data_info_allocs();
1289         free_expression_stack(&switch_expr_stack);
1290         __free_ptr_list((struct ptr_list **)&big_statement_stack);
1291         __bail_on_rest_of_function = 0;
1292 }
1293
1294 static void parse_inline(struct expression *call)
1295 {
1296         struct symbol *base_type;
1297         int loop_num_bak = loop_num;
1298         int final_pass_bak = final_pass;
1299         char *cur_func_bak = cur_func;
1300         struct statement_list *big_statement_stack_bak = big_statement_stack;
1301         struct expression_list *big_expression_stack_bak = big_expression_stack;
1302         struct expression_list *switch_expr_stack_bak = switch_expr_stack;
1303         struct symbol *cur_func_sym_bak = cur_func_sym;
1304
1305         __pass_to_client(call, INLINE_FN_START);
1306         final_pass = 0;  /* don't print anything */
1307         __inline_fn = call;
1308
1309         base_type = get_base_type(call->fn->symbol);
1310         cur_func_sym = call->fn->symbol;
1311         if (call->fn->symbol->ident)
1312                 cur_func = call->fn->symbol->ident->name;
1313         else
1314                 cur_func = NULL;
1315         set_position(call->fn->symbol->pos);
1316
1317         save_all_states();
1318         big_statement_stack = NULL;
1319         big_expression_stack = NULL;
1320         switch_expr_stack = NULL;
1321
1322         sm_debug("inline function:  %s\n", cur_func);
1323         __unnullify_path();
1324         loop_num = 0;
1325         start_function_definition(call->fn->symbol);
1326         __split_stmt(base_type->stmt);
1327         __split_stmt(base_type->inline_stmt);
1328         __pass_to_client(call->fn->symbol, END_FUNC_HOOK);
1329         __pass_to_client(call->fn->symbol, AFTER_FUNC_HOOK);
1330
1331         free_expression_stack(&switch_expr_stack);
1332         __free_ptr_list((struct ptr_list **)&big_statement_stack);
1333         nullify_path();
1334         free_goto_stack();
1335
1336         loop_num = loop_num_bak;
1337         final_pass = final_pass_bak;
1338         cur_func_sym = cur_func_sym_bak;
1339         cur_func = cur_func_bak;
1340         big_statement_stack = big_statement_stack_bak;
1341         big_expression_stack = big_expression_stack_bak;
1342         switch_expr_stack = switch_expr_stack_bak;
1343
1344         restore_all_states();
1345         set_position(call->pos);
1346         __inline_fn = NULL;
1347         __pass_to_client(call, INLINE_FN_END);
1348 }
1349
1350 static struct symbol_list *inlines_called;
1351 static void add_inline_function(struct symbol *sym)
1352 {
1353         static struct symbol_list *already_added;
1354         struct symbol *tmp;
1355
1356         FOR_EACH_PTR(already_added, tmp) {
1357                 if (tmp == sym)
1358                         return;
1359         } END_FOR_EACH_PTR(tmp);
1360
1361         add_ptr_list(&already_added, sym);
1362         add_ptr_list(&inlines_called, sym);
1363 }
1364
1365 static void process_inlines(void)
1366 {
1367         struct symbol *tmp;
1368
1369         FOR_EACH_PTR(inlines_called, tmp) {
1370                 split_function(tmp);
1371         } END_FOR_EACH_PTR(tmp);
1372         free_ptr_list(&inlines_called);
1373 }
1374
1375 static struct symbol *get_last_scoped_symbol(struct symbol_list *big_list, int use_static)
1376 {
1377         struct symbol *sym;
1378
1379         FOR_EACH_PTR_REVERSE(big_list, sym) {
1380                 if (!sym->scope)
1381                         continue;
1382                 if (use_static && sym->ctype.modifiers & MOD_STATIC)
1383                         return sym;
1384                 if (!use_static && !(sym->ctype.modifiers & MOD_STATIC))
1385                         return sym;
1386         } END_FOR_EACH_PTR_REVERSE(sym);
1387
1388         return NULL;
1389 }
1390
1391 static void split_inlines_in_scope(struct symbol *sym)
1392 {
1393         struct symbol *base;
1394         struct symbol_list *scope_list;
1395         int stream;
1396
1397         scope_list = sym->scope->symbols;
1398         stream = sym->pos.stream;
1399
1400         /* find the last static symbol in the file */
1401         FOR_EACH_PTR_REVERSE(scope_list, sym) {
1402                 if (sym->pos.stream != stream)
1403                         continue;
1404                 if (sym->type != SYM_NODE)
1405                         continue;
1406                 base = get_base_type(sym);
1407                 if (!base)
1408                         continue;
1409                 if (base->type != SYM_FN)
1410                         continue;
1411                 if (!base->inline_stmt)
1412                         continue;
1413                 add_inline_function(sym);
1414         } END_FOR_EACH_PTR_REVERSE(sym);
1415
1416         process_inlines();
1417 }
1418
1419 static void split_inlines(struct symbol_list *sym_list)
1420 {
1421         struct symbol *sym;
1422
1423         sym = get_last_scoped_symbol(sym_list, 0);
1424         if (sym)
1425                 split_inlines_in_scope(sym);
1426         sym = get_last_scoped_symbol(sym_list, 1);
1427         if (sym)
1428                 split_inlines_in_scope(sym);
1429 }
1430
1431 static struct stree *clone_estates_perm(struct stree *orig)
1432 {
1433         struct stree *ret = NULL;
1434         struct sm_state *tmp;
1435
1436         FOR_EACH_SM(orig, tmp) {
1437                 set_state_stree_perm(&ret, tmp->owner, tmp->name, tmp->sym, clone_estate_perm(tmp->state));
1438         } END_FOR_EACH_SM(tmp);
1439
1440         return ret;
1441 }
1442
1443 static void split_functions(struct symbol_list *sym_list)
1444 {
1445         struct symbol *sym;
1446
1447         __unnullify_path();
1448         FOR_EACH_PTR(sym_list, sym) {
1449                 set_position(sym->pos);
1450                 if (sym->type != SYM_NODE || get_base_type(sym)->type != SYM_FN) {
1451                         __pass_to_client(sym, BASE_HOOK);
1452                         fake_global_assign(sym);
1453                 }
1454         } END_FOR_EACH_PTR(sym);
1455         global_states = clone_estates_perm(get_all_states_stree(SMATCH_EXTRA));
1456         nullify_path();
1457
1458         FOR_EACH_PTR(sym_list, sym) {
1459                 set_position(sym->pos);
1460                 if (sym->type == SYM_NODE && get_base_type(sym)->type == SYM_FN) {
1461                         split_function(sym);
1462                         process_inlines();
1463                 }
1464         } END_FOR_EACH_PTR(sym);
1465         split_inlines(sym_list);
1466         __pass_to_client(sym_list, END_FILE_HOOK);
1467 }
1468
1469 void smatch(int argc, char **argv)
1470 {
1471
1472         struct string_list *filelist = NULL;
1473         struct symbol_list *sym_list;
1474
1475         if (argc < 2) {
1476                 printf("Usage:  smatch [--debug] <filename.c>\n");
1477                 exit(1);
1478         }
1479         sparse_initialize(argc, argv, &filelist);
1480         set_valid_ptr_max();
1481         FOR_EACH_PTR_NOTAG(filelist, base_file) {
1482                 if (option_file_output) {
1483                         char buf[256];
1484
1485                         snprintf(buf, sizeof(buf), "%s.smatch", base_file);
1486                         sm_outfd = fopen(buf, "w");
1487                         if (!sm_outfd) {
1488                                 printf("Error:  Cannot open %s\n", base_file);
1489                                 exit(1);
1490                         }
1491                 }
1492                 sym_list = sparse_keep_tokens(base_file);
1493                 split_functions(sym_list);
1494         } END_FOR_EACH_PTR_NOTAG(base_file);
1495 }