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 static int in_fake_env;
  30 int final_pass;
  31 int __inline_call;
  32 struct expression  *__inline_fn;
  33
  34 static int __smatch_lineno = 0;
  35
  36 static char *base_file;
  37 static const char *filename;
  38 static char *pathname;
  39 static char *full_filename;
  40 static char *cur_func;
  41 static unsigned int loop_count;
  42 static int last_goto_statement_handled;
  43 int __expr_stmt_count;
  44 int __in_function_def;
  45 static struct expression_list *switch_expr_stack = NULL;
  46 static struct expression_list *post_op_stack = NULL;
  47
  48 struct expression_list *big_expression_stack;
  49 struct statement_list *big_statement_stack;
  50 struct statement *__prev_stmt;
  51 struct statement *__cur_stmt;
  52 struct statement *__next_stmt;
  53 int __in_pre_condition = 0;
  54 int __bail_on_rest_of_function = 0;
  55 static struct timeval fn_start_time;
  56 char *get_function(void) { return cur_func; }
  57 int get_lineno(void) { return __smatch_lineno; }
  58 int inside_loop(void) { return !!loop_count; }
  59 int definitely_inside_loop(void) { return !!(loop_count & ~0x80000000); }
  60 struct expression *get_switch_expr(void) { return top_expression(switch_expr_stack); }
  61 int in_expression_statement(void) { return !!__expr_stmt_count; }
  62
  63 static void split_symlist(struct symbol_list *sym_list);
  64 static void split_declaration(struct symbol_list *sym_list);
  65 static void split_expr_list(struct expression_list *expr_list, struct expression *parent);
  66 static void add_inline_function(struct symbol *sym);
  67 static void parse_inline(struct expression *expr);
  68
  69 int option_assume_loops = 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 (in_fake_env)
 120                 return;
 121
 122         if (pos.stream == 0 && pos.line == 0)
 123                 return;
 124
 125         __smatch_lineno = pos.line;
 126
 127         if (pos.stream == prev_stream)
 128                 return;
 129
 130         filename = stream_name(pos.stream);
 131
 132         free(full_filename);
 133         pathname = getcwd(NULL, 0);
 134         if (pathname) {
 135                 len = strlen(pathname) + 1 + strlen(filename) + 1;
 136                 full_filename = malloc(len);
 137                 snprintf(full_filename, len, "%s/%s", pathname, filename);
 138         } else {
 139                 full_filename = alloc_string(filename);
 140         }
 141         free(pathname);
 142 }
 143
 144 int is_assigned_call(struct expression *expr)
 145 {
 146         struct expression *parent = expr_get_parent_expr(expr);
 147
 148         if (parent &&
 149             parent->type == EXPR_ASSIGNMENT &&
 150             parent->op == '=' &&
 151             strip_expr(parent->right) == expr)
 152                 return 1;
 153
 154         return 0;
 155 }
 156
 157 static int is_inline_func(struct expression *expr)
 158 {
 159         if (expr->type != EXPR_SYMBOL || !expr->symbol)
 160                 return 0;
 161         if (expr->symbol->ctype.modifiers & MOD_INLINE)
 162                 return 1;
 163         return 0;
 164 }
 165
 166 static int is_noreturn_func(struct expression *expr)
 167 {
 168         if (expr->type != EXPR_SYMBOL || !expr->symbol)
 169                 return 0;
 170         if (expr->symbol->ctype.modifiers & MOD_NORETURN)
 171                 return 1;
 172         return 0;
 173 }
 174
 175 int inlinable(struct expression *expr)
 176 {
 177         struct symbol *sym;
 178         struct statement *last_stmt = NULL;
 179
 180         if (__inline_fn)  /* don't nest */
 181                 return 0;
 182
 183         if (expr->type != EXPR_SYMBOL || !expr->symbol)
 184                 return 0;
 185         if (is_no_inline_function(expr->symbol->ident->name))
 186                 return 0;
 187         sym = get_base_type(expr->symbol);
 188         if (sym->stmt && sym->stmt->type == STMT_COMPOUND) {
 189                 if (ptr_list_size((struct ptr_list *)sym->stmt->stmts) > 10)
 190                         return 0;
 191                 if (sym->stmt->type != STMT_COMPOUND)
 192                         return 0;
 193                 last_stmt = last_ptr_list((struct ptr_list *)sym->stmt->stmts);
 194         }
 195         if (sym->inline_stmt && sym->inline_stmt->type == STMT_COMPOUND) {
 196                 if (ptr_list_size((struct ptr_list *)sym->inline_stmt->stmts) > 10)
 197                         return 0;
 198                 if (sym->inline_stmt->type != STMT_COMPOUND)
 199                         return 0;
 200                 last_stmt = last_ptr_list((struct ptr_list *)sym->inline_stmt->stmts);
 201         }
 202
 203         if (!last_stmt)
 204                 return 0;
 205
 206         /* the magic numbers in this function are pulled out of my bum. */
 207         if (last_stmt->pos.line > sym->pos.line + 20)
 208                 return 0;
 209
 210         return 1;
 211 }
 212
 213 void __process_post_op_stack(void)
 214 {
 215         struct expression *expr;
 216
 217         FOR_EACH_PTR(post_op_stack, expr) {
 218                 __pass_to_client(expr, OP_HOOK);
 219         } END_FOR_EACH_PTR(expr);
 220
 221         __free_ptr_list((struct ptr_list **)&post_op_stack);
 222 }
 223
 224 static int handle_comma_assigns(struct expression *expr)
 225 {
 226         struct expression *right;
 227         struct expression *assign;
 228
 229         right = strip_expr(expr->right);
 230         if (right->type != EXPR_COMMA)
 231                 return 0;
 232
 233         __split_expr(right->left);
 234         __process_post_op_stack();
 235
 236         assign = assign_expression(expr->left, right->right);
 237         __split_expr(assign);
 238
 239         return 1;
 240 }
 241
 242 /* This is to handle *p++ = foo; assignments */
 243 static int handle_postop_assigns(struct expression *expr)
 244 {
 245         struct expression *left, *fake_left;
 246         struct expression *assign;
 247
 248         left = strip_expr(expr->left);
 249         if (left->type != EXPR_PREOP || left->op != '*')
 250                 return 0;
 251         left = strip_expr(left->unop);
 252         if (left->type != EXPR_POSTOP)
 253                 return 0;
 254
 255         fake_left = deref_expression(strip_expr(left->unop));
 256         assign = assign_expression(fake_left, expr->right);
 257
 258         __split_expr(assign);
 259         __split_expr(expr->left);
 260
 261         return 1;
 262 }
 263
 264 static int prev_expression_is_getting_address(struct expression *expr)
 265 {
 266         struct expression *parent;
 267
 268         do {
 269                 parent = expr_get_parent_expr(expr);
 270
 271                 if (!parent)
 272                         return 0;
 273                 if (parent->type == EXPR_PREOP && parent->op == '&')
 274                         return 1;
 275                 if (parent->type == EXPR_PREOP && parent->op == '(')
 276                         goto next;
 277                 if (parent->type == EXPR_DEREF && parent->op == '.')
 278                         goto next;
 279
 280                 return 0;
 281 next:
 282                 expr = parent;
 283         } while (1);
 284 }
 285
 286 void __split_expr(struct expression *expr)
 287 {
 288         if (!expr)
 289                 return;
 290
 291         // sm_msg(" Debug expr_type %d %s", expr->type, show_special(expr->op));
 292
 293         if (__in_fake_assign && expr->type != EXPR_ASSIGNMENT)
 294                 return;
 295         if (__in_fake_assign >= 4)  /* don't allow too much nesting */
 296                 return;
 297
 298         push_expression(&big_expression_stack, expr);
 299         set_position(expr->pos);
 300         __pass_to_client(expr, EXPR_HOOK);
 301
 302         switch (expr->type) {
 303         case EXPR_PREOP:
 304                 expr_set_parent_expr(expr->unop, expr);
 305
 306                 if (expr->op == '*' &&
 307                     !prev_expression_is_getting_address(expr))
 308                         __pass_to_client(expr, DEREF_HOOK);
 309                 __split_expr(expr->unop);
 310                 __pass_to_client(expr, OP_HOOK);
 311                 break;
 312         case EXPR_POSTOP:
 313                 expr_set_parent_expr(expr->unop, expr);
 314
 315                 __split_expr(expr->unop);
 316                 push_expression(&post_op_stack, expr);
 317                 break;
 318         case EXPR_STATEMENT:
 319                 __expr_stmt_count++;
 320                 if (expr->statement && !expr_get_parent_expr(expr->statement)) {
 321                         stmt_set_parent_stmt(expr->statement,
 322                                         last_ptr_list((struct ptr_list *)big_statement_stack));
 323                 }
 324                 __split_stmt(expr->statement);
 325                 __expr_stmt_count--;
 326                 break;
 327         case EXPR_LOGICAL:
 328         case EXPR_COMPARE:
 329                 expr_set_parent_expr(expr->left, expr);
 330                 expr_set_parent_expr(expr->right, expr);
 331
 332                 __pass_to_client(expr, LOGIC_HOOK);
 333                 __handle_logic(expr);
 334                 break;
 335         case EXPR_BINOP:
 336                 expr_set_parent_expr(expr->left, expr);
 337                 expr_set_parent_expr(expr->right, expr);
 338
 339                 __pass_to_client(expr, BINOP_HOOK);
 340         case EXPR_COMMA:
 341                 expr_set_parent_expr(expr->left, expr);
 342                 expr_set_parent_expr(expr->right, expr);
 343
 344                 __split_expr(expr->left);
 345                 __process_post_op_stack();
 346                 __split_expr(expr->right);
 347                 break;
 348         case EXPR_ASSIGNMENT: {
 349                 struct expression *right;
 350
 351                 expr_set_parent_expr(expr->left, expr);
 352                 expr_set_parent_expr(expr->right, expr);
 353
 354                 if (!expr->right)
 355                         break;
 356
 357                 right = strip_expr(expr->right);
 358
 359                 __pass_to_client(expr, RAW_ASSIGNMENT_HOOK);
 360
 361                 /* foo = !bar() */
 362                 if (__handle_condition_assigns(expr))
 363                         break;
 364                 /* foo = (x < 5 ? foo : 5); */
 365                 if (__handle_select_assigns(expr))
 366                         break;
 367                 /* foo = ({frob(); frob(); frob(); 1;}) */
 368                 if (__handle_expr_statement_assigns(expr))
 369                         break;
 370                 /* foo = (3, 4); */
 371                 if (handle_comma_assigns(expr))
 372                         break;
 373                 if (handle_postop_assigns(expr))
 374                         break;
 375
 376                 __split_expr(expr->right);
 377                 if (outside_of_function())
 378                         __pass_to_client(expr, GLOBAL_ASSIGNMENT_HOOK);
 379                 else
 380                         __pass_to_client(expr, ASSIGNMENT_HOOK);
 381
 382                 __fake_struct_member_assignments(expr);
 383
 384                 if (expr->op == '=' && right->type == EXPR_CALL)
 385                         __pass_to_client(expr, CALL_ASSIGNMENT_HOOK);
 386
 387                 if (get_macro_name(right->pos) &&
 388                     get_macro_name(expr->pos) != get_macro_name(right->pos))
 389                         __pass_to_client(expr, MACRO_ASSIGNMENT_HOOK);
 390
 391                 __pass_to_client(expr, ASSIGNMENT_HOOK_AFTER);
 392
 393                 __split_expr(expr->left);
 394                 break;
 395         }
 396         case EXPR_DEREF:
 397                 expr_set_parent_expr(expr->deref, expr);
 398
 399                 __pass_to_client(expr, DEREF_HOOK);
 400                 __split_expr(expr->deref);
 401                 break;
 402         case EXPR_SLICE:
 403                 expr_set_parent_expr(expr->base, expr);
 404
 405                 __split_expr(expr->base);
 406                 break;
 407         case EXPR_CAST:
 408         case EXPR_FORCE_CAST:
 409                 expr_set_parent_expr(expr->cast_expression, expr);
 410
 411                 __pass_to_client(expr, CAST_HOOK);
 412                 __split_expr(expr->cast_expression);
 413                 break;
 414         case EXPR_SIZEOF:
 415                 if (expr->cast_expression)
 416                         __pass_to_client(strip_parens(expr->cast_expression),
 417                                          SIZEOF_HOOK);
 418                 break;
 419         case EXPR_OFFSETOF:
 420         case EXPR_ALIGNOF:
 421                 evaluate_expression(expr);
 422                 break;
 423         case EXPR_CONDITIONAL:
 424         case EXPR_SELECT:
 425                 expr_set_parent_expr(expr->conditional, expr);
 426                 expr_set_parent_expr(expr->cond_true, expr);
 427                 expr_set_parent_expr(expr->cond_false, expr);
 428
 429                 if (known_condition_true(expr->conditional)) {
 430                         __split_expr(expr->cond_true);
 431                         break;
 432                 }
 433                 if (known_condition_false(expr->conditional)) {
 434                         __split_expr(expr->cond_false);
 435                         break;
 436                 }
 437                 __pass_to_client(expr, SELECT_HOOK);
 438                 __split_whole_condition(expr->conditional);
 439                 __split_expr(expr->cond_true);
 440                 __push_true_states();
 441                 __use_false_states();
 442                 __split_expr(expr->cond_false);
 443                 __merge_true_states();
 444                 break;
 445         case EXPR_CALL:
 446                 expr_set_parent_expr(expr->fn, expr);
 447
 448                 if (sym_name_is("__builtin_constant_p", expr->fn))
 449                         break;
 450                 split_expr_list(expr->args, expr);
 451                 __split_expr(expr->fn);
 452                 if (is_inline_func(expr->fn))
 453                         add_inline_function(expr->fn->symbol);
 454                 if (inlinable(expr->fn))
 455                         __inline_call = 1;
 456                 __process_post_op_stack();
 457                 __pass_to_client(expr, FUNCTION_CALL_HOOK);
 458                 __inline_call = 0;
 459                 if (inlinable(expr->fn)) {
 460                         parse_inline(expr);
 461                 }
 462                 __pass_to_client(expr, CALL_HOOK_AFTER_INLINE);
 463                 if (is_noreturn_func(expr->fn))
 464                         nullify_path();
 465                 break;
 466         case EXPR_INITIALIZER:
 467                 split_expr_list(expr->expr_list, expr);
 468                 break;
 469         case EXPR_IDENTIFIER:
 470                 expr_set_parent_expr(expr->ident_expression, expr);
 471                 __split_expr(expr->ident_expression);
 472                 break;
 473         case EXPR_INDEX:
 474                 expr_set_parent_expr(expr->idx_expression, expr);
 475                 __split_expr(expr->idx_expression);
 476                 break;
 477         case EXPR_POS:
 478                 expr_set_parent_expr(expr->init_expr, expr);
 479                 __split_expr(expr->init_expr);
 480                 break;
 481         case EXPR_SYMBOL:
 482                 __pass_to_client(expr, SYM_HOOK);
 483                 break;
 484         case EXPR_STRING:
 485                 __pass_to_client(expr, STRING_HOOK);
 486                 break;
 487         default:
 488                 break;
 489         };
 490         pop_expression(&big_expression_stack);
 491 }
 492
 493 static int is_forever_loop(struct statement *stmt)
 494 {
 495         struct expression *expr;
 496         sval_t sval;
 497
 498         expr = strip_expr(stmt->iterator_pre_condition);
 499         if (!expr)
 500                 expr = stmt->iterator_post_condition;
 501         if (!expr) {
 502                 /* this is a for(;;) loop... */
 503                 return 1;
 504         }
 505
 506         if (get_value(expr, &sval) && sval.value != 0)
 507                 return 1;
 508
 509         return 0;
 510 }
 511
 512 static int loop_num;
 513 static char *get_loop_name(int num)
 514 {
 515         char buf[256];
 516
 517         snprintf(buf, 255, "-loop%d", num);
 518         buf[255] = '\0';
 519         return alloc_sname(buf);
 520 }
 521
 522 /*
 523  * Pre Loops are while and for loops.
 524  */
 525 static void handle_pre_loop(struct statement *stmt)
 526 {
 527         int once_through; /* we go through the loop at least once */
 528         struct sm_state *extra_sm = NULL;
 529         int unchanged = 0;
 530         char *loop_name;
 531         struct stree *stree = NULL;
 532         struct sm_state *sm = NULL;
 533
 534         loop_name = get_loop_name(loop_num);
 535         loop_num++;
 536
 537         __split_stmt(stmt->iterator_pre_statement);
 538         __prev_stmt = stmt->iterator_pre_statement;
 539
 540         once_through = implied_condition_true(stmt->iterator_pre_condition);
 541
 542         loop_count++;
 543         __push_continues();
 544         __push_breaks();
 545
 546         __merge_gotos(loop_name, NULL);
 547
 548         extra_sm = __extra_handle_canonical_loops(stmt, &stree);
 549         __in_pre_condition++;
 550         __pass_to_client(stmt, PRELOOP_HOOK);
 551         __split_whole_condition(stmt->iterator_pre_condition);
 552         __in_pre_condition--;
 553         FOR_EACH_SM(stree, sm) {
 554                 set_state(sm->owner, sm->name, sm->sym, sm->state);
 555         } END_FOR_EACH_SM(sm);
 556         free_stree(&stree);
 557         if (extra_sm)
 558                 extra_sm = get_sm_state(extra_sm->owner, extra_sm->name, extra_sm->sym);
 559
 560         if (option_assume_loops)
 561                 once_through = 1;
 562
 563         __split_stmt(stmt->iterator_statement);
 564         if (is_forever_loop(stmt)) {
 565                 __merge_continues();
 566                 __save_gotos(loop_name, NULL);
 567
 568                 __push_fake_cur_stree();
 569                 __split_stmt(stmt->iterator_post_statement);
 570                 stree = __pop_fake_cur_stree();
 571
 572                 __discard_false_states();
 573                 __use_breaks();
 574
 575                 if (!__path_is_null())
 576                         __merge_stree_into_cur(stree);
 577                 free_stree(&stree);
 578         } else {
 579                 __merge_continues();
 580                 unchanged = __iterator_unchanged(extra_sm);
 581                 __split_stmt(stmt->iterator_post_statement);
 582                 __prev_stmt = stmt->iterator_post_statement;
 583                 __cur_stmt = stmt;
 584
 585                 __save_gotos(loop_name, NULL);
 586                 __in_pre_condition++;
 587                 __split_whole_condition(stmt->iterator_pre_condition);
 588                 __in_pre_condition--;
 589                 nullify_path();
 590                 __merge_false_states();
 591                 if (once_through)
 592                         __discard_false_states();
 593                 else
 594                         __merge_false_states();
 595
 596                 if (extra_sm && unchanged)
 597                         __extra_pre_loop_hook_after(extra_sm,
 598                                                 stmt->iterator_post_statement,
 599                                                 stmt->iterator_pre_condition);
 600                 __merge_breaks();
 601         }
 602         loop_count--;
 603 }
 604
 605 /*
 606  * Post loops are do {} while();
 607  */
 608 static void handle_post_loop(struct statement *stmt)
 609 {
 610         char *loop_name;
 611
 612         loop_name = get_loop_name(loop_num);
 613         loop_num++;
 614         loop_count++;
 615
 616         __push_continues();
 617         __push_breaks();
 618         __merge_gotos(loop_name, NULL);
 619         __split_stmt(stmt->iterator_statement);
 620         __merge_continues();
 621         if (!is_zero(stmt->iterator_post_condition))
 622                 __save_gotos(loop_name, NULL);
 623
 624         if (is_forever_loop(stmt)) {
 625                 __use_breaks();
 626         } else {
 627                 __split_whole_condition(stmt->iterator_post_condition);
 628                 __use_false_states();
 629                 __merge_breaks();
 630         }
 631         loop_count--;
 632 }
 633
 634 static int empty_statement(struct statement *stmt)
 635 {
 636         if (!stmt)
 637                 return 0;
 638         if (stmt->type == STMT_EXPRESSION && !stmt->expression)
 639                 return 1;
 640         return 0;
 641 }
 642
 643 static int last_stmt_on_same_line(void)
 644 {
 645         struct statement *stmt;
 646         int i = 0;
 647
 648         FOR_EACH_PTR_REVERSE(big_statement_stack, stmt) {
 649                 if (!i++)
 650                         continue;
 651                 if  (stmt->pos.line == get_lineno())
 652                         return 1;
 653                 return 0;
 654         } END_FOR_EACH_PTR_REVERSE(stmt);
 655         return 0;
 656 }
 657
 658 static void split_asm_constraints(struct expression_list *expr_list)
 659 {
 660         struct expression *expr;
 661         int state = 0;
 662
 663         FOR_EACH_PTR(expr_list, expr) {
 664                 switch (state) {
 665                 case 0: /* identifier */
 666                 case 1: /* constraint */
 667                         state++;
 668                         continue;
 669                 case 2: /* expression */
 670                         state = 0;
 671                         __split_expr(expr);
 672                         continue;
 673                 }
 674         } END_FOR_EACH_PTR(expr);
 675 }
 676
 677 static int is_case_val(struct statement *stmt, sval_t sval)
 678 {
 679         sval_t case_sval;
 680
 681         if (stmt->type != STMT_CASE)
 682                 return 0;
 683         if (!stmt->case_expression) {
 684                 __set_default();
 685                 return 1;
 686         }
 687         if (!get_value(stmt->case_expression, &case_sval))
 688                 return 0;
 689         if (case_sval.value == sval.value)
 690                 return 1;
 691         return 0;
 692 }
 693
 694 static struct range_list *get_case_rl(struct expression *switch_expr,
 695                                       struct expression *case_expr,
 696                                       struct expression *case_to)
 697 {
 698         sval_t start, end;
 699         struct range_list *rl = NULL;
 700         struct symbol *switch_type;
 701
 702         switch_type = get_type(switch_expr);
 703         if (get_value(case_to, &end) && get_value(case_expr, &start)) {
 704                 start = sval_cast(switch_type, start);
 705                 end = sval_cast(switch_type, end);
 706                 add_range(&rl, start, end);
 707         } else if (get_value(case_expr, &start)) {
 708                 start = sval_cast(switch_type, start);
 709                 add_range(&rl, start, start);
 710         }
 711
 712         return rl;
 713 }
 714
 715 static void split_known_switch(struct statement *stmt, sval_t sval)
 716 {
 717         struct statement *tmp;
 718         struct range_list *rl;
 719
 720         __split_expr(stmt->switch_expression);
 721         sval = sval_cast(get_type(stmt->switch_expression), sval);
 722
 723         push_expression(&switch_expr_stack, stmt->switch_expression);
 724         __save_switch_states(top_expression(switch_expr_stack));
 725         nullify_path();
 726         __push_default();
 727         __push_breaks();
 728
 729         stmt = stmt->switch_statement;
 730
 731         __push_scope_hooks();
 732         FOR_EACH_PTR(stmt->stmts, tmp) {
 733                 __smatch_lineno = tmp->pos.line;
 734                 if (is_case_val(tmp, sval)) {
 735                         rl = alloc_rl(sval, sval);
 736                         __merge_switches(top_expression(switch_expr_stack), rl);
 737                         __pass_case_to_client(top_expression(switch_expr_stack), rl);
 738                 }
 739                 if (__path_is_null())
 740                         continue;
 741                 __split_stmt(tmp);
 742                 if (__path_is_null()) {
 743                         __set_default();
 744                         goto out;
 745                 }
 746         } END_FOR_EACH_PTR(tmp);
 747 out:
 748         __call_scope_hooks();
 749         if (!__pop_default())
 750                 __merge_switches(top_expression(switch_expr_stack), NULL);
 751         __discard_switches();
 752         __merge_breaks();
 753         pop_expression(&switch_expr_stack);
 754 }
 755
 756 static void split_case(struct statement *stmt)
 757 {
 758         struct range_list *rl = NULL;
 759
 760         rl = get_case_rl(top_expression(switch_expr_stack),
 761                          stmt->case_expression, stmt->case_to);
 762         while (stmt->case_statement->type == STMT_CASE) {
 763                 struct range_list *tmp;
 764
 765                 tmp = get_case_rl(top_expression(switch_expr_stack),
 766                                   stmt->case_statement->case_expression,
 767                                   stmt->case_statement->case_to);
 768                 if (!tmp)
 769                         break;
 770                 rl = rl_union(rl, tmp);
 771                 if (!stmt->case_expression)
 772                         __set_default();
 773                 stmt = stmt->case_statement;
 774         }
 775
 776         __merge_switches(top_expression(switch_expr_stack), rl);
 777
 778         if (!stmt->case_expression)
 779                 __set_default();
 780         __split_stmt(stmt->case_statement);
 781 }
 782
 783 static int taking_too_long(void)
 784 {
 785         int ms;
 786
 787         ms = ms_since(&fn_start_time);
 788         if (ms > 1000 * 60 * 5)  /* five minutes */
 789                 return 1;
 790         return 0;
 791 }
 792
 793 static int is_last_stmt(struct statement *cur_stmt)
 794 {
 795         struct symbol *fn = get_base_type(cur_func_sym);
 796         struct statement *stmt;
 797
 798         if (!fn)
 799                 return 0;
 800         stmt = fn->stmt;
 801         if (!stmt)
 802                 stmt = fn->inline_stmt;
 803         if (!stmt || stmt->type != STMT_COMPOUND)
 804                 return 0;
 805         stmt = last_ptr_list((struct ptr_list *)stmt->stmts);
 806         if (stmt && stmt->type == STMT_LABEL)
 807                 stmt = stmt->label_statement;
 808         if (stmt == cur_stmt)
 809                 return 1;
 810         return 0;
 811 }
 812
 813 static void handle_backward_goto(struct statement *goto_stmt)
 814 {
 815         const char *goto_name, *label_name;
 816         struct statement *func_stmt;
 817         struct symbol *base_type = get_base_type(cur_func_sym);
 818         struct statement *tmp;
 819         int found = 0;
 820
 821         if (!option_info)
 822                 return;
 823         if (last_goto_statement_handled)
 824                 return;
 825         last_goto_statement_handled = 1;
 826
 827         if (!goto_stmt->goto_label ||
 828             goto_stmt->goto_label->type != SYM_LABEL ||
 829             !goto_stmt->goto_label->ident)
 830                 return;
 831         goto_name = goto_stmt->goto_label->ident->name;
 832
 833         func_stmt = base_type->stmt;
 834         if (!func_stmt)
 835                 func_stmt = base_type->inline_stmt;
 836         if (!func_stmt)
 837                 return;
 838         if (func_stmt->type != STMT_COMPOUND)
 839                 return;
 840
 841         FOR_EACH_PTR(func_stmt->stmts, tmp) {
 842                 if (!found) {
 843                         if (tmp->type != STMT_LABEL)
 844                                 continue;
 845                         if (!tmp->label_identifier ||
 846                             tmp->label_identifier->type != SYM_LABEL ||
 847                             !tmp->label_identifier->ident)
 848                                 continue;
 849                         label_name = tmp->label_identifier->ident->name;
 850                         if (strcmp(goto_name, label_name) != 0)
 851                                 continue;
 852                         found = 1;
 853                 }
 854                 __split_stmt(tmp);
 855         } END_FOR_EACH_PTR(tmp);
 856 }
 857
 858 static void fake_a_return(void)
 859 {
 860         struct symbol *return_type;
 861
 862         nullify_path();
 863         __unnullify_path();
 864
 865         return_type = get_real_base_type(cur_func_sym);
 866         return_type = get_real_base_type(return_type);
 867         if (return_type != &void_ctype) {
 868                 __pass_to_client(unknown_value_expression(NULL), RETURN_HOOK);
 869                 nullify_path();
 870         }
 871 }
 872
 873 static void fake_an_empty_default(struct position pos)
 874 {
 875         static struct statement none = {};
 876
 877         none.pos = pos;
 878         none.type = STMT_NONE;
 879         __merge_switches(top_expression(switch_expr_stack), NULL);
 880         __split_stmt(&none);
 881 }
 882
 883 static void split_compound(struct statement *stmt)
 884 {
 885         struct statement *prev = NULL;
 886         struct statement *cur = NULL;
 887         struct statement *next;
 888
 889         __push_scope_hooks();
 890
 891         FOR_EACH_PTR(stmt->stmts, next) {
 892                 /* just set them all ahead of time */
 893                 stmt_set_parent_stmt(next, stmt);
 894
 895                 if (cur) {
 896                         __prev_stmt = prev;
 897                         __next_stmt = next;
 898                         __cur_stmt = cur;
 899                         __split_stmt(cur);
 900                 }
 901                 prev = cur;
 902                 cur = next;
 903         } END_FOR_EACH_PTR(next);
 904         if (cur) {
 905                 __prev_stmt = prev;
 906                 __cur_stmt = cur;
 907                 __next_stmt = NULL;
 908                 __split_stmt(cur);
 909         }
 910
 911         /*
 912          * For function scope, then delay calling the scope hooks until the
 913          * end of function hooks can run.  I'm not positive this is the right
 914          * thing...
 915          */
 916         if (!is_last_stmt(cur))
 917                 __call_scope_hooks();
 918 }
 919
 920 /*
 921  * This is a hack, work around for detecting empty functions.
 922  */
 923 static int need_delayed_scope_hooks(void)
 924 {
 925         struct symbol *fn = get_base_type(cur_func_sym);
 926         struct statement *stmt;
 927
 928         if (!fn)
 929                 return 0;
 930         stmt = fn->stmt;
 931         if (!stmt)
 932                 stmt = fn->inline_stmt;
 933         if (stmt && stmt->type == STMT_COMPOUND)
 934                 return 1;
 935         return 0;
 936 }
 937
 938 void __split_label_stmt(struct statement *stmt)
 939 {
 940         if (stmt->label_identifier &&
 941             stmt->label_identifier->type == SYM_LABEL &&
 942             stmt->label_identifier->ident) {
 943                 loop_count |= 0x80000000;
 944                 __merge_gotos(stmt->label_identifier->ident->name, stmt->label_identifier);
 945         }
 946 }
 947
 948 static void find_asm_gotos(struct statement *stmt)
 949 {
 950         struct symbol *sym;
 951
 952         FOR_EACH_PTR(stmt->asm_labels, sym) {
 953                 __save_gotos(sym->ident->name, sym);
 954         } END_FOR_EACH_PTR(sym);
 955 }
 956
 957 void __split_stmt(struct statement *stmt)
 958 {
 959         sval_t sval;
 960
 961         if (!stmt)
 962                 goto out;
 963
 964         if (__bail_on_rest_of_function)
 965                 return;
 966
 967         if (out_of_memory() || taking_too_long()) {
 968
 969                 __bail_on_rest_of_function = 1;
 970                 final_pass = 1;
 971                 sm_msg("Function too hairy.  Giving up.");
 972                 fake_a_return();
 973                 final_pass = 0;  /* turn off sm_msg() from here */
 974                 return;
 975         }
 976
 977         add_ptr_list(&big_statement_stack, stmt);
 978         free_expression_stack(&big_expression_stack);
 979         set_position(stmt->pos);
 980         __pass_to_client(stmt, STMT_HOOK);
 981
 982         switch (stmt->type) {
 983         case STMT_DECLARATION:
 984                 split_declaration(stmt->declaration);
 985                 break;
 986         case STMT_RETURN:
 987                 __split_expr(stmt->ret_value);
 988                 __pass_to_client(stmt->ret_value, RETURN_HOOK);
 989                 __process_post_op_stack();
 990                 nullify_path();
 991                 break;
 992         case STMT_EXPRESSION:
 993                 __split_expr(stmt->expression);
 994                 break;
 995         case STMT_COMPOUND:
 996                 split_compound(stmt);
 997                 break;
 998         case STMT_IF:
 999                 stmt_set_parent_stmt(stmt->if_true, stmt);
1000                 stmt_set_parent_stmt(stmt->if_false, stmt);
1001
1002                 if (known_condition_true(stmt->if_conditional)) {
1003                         __split_stmt(stmt->if_true);
1004                         break;
1005                 }
1006                 if (known_condition_false(stmt->if_conditional)) {
1007                         __split_stmt(stmt->if_false);
1008                         break;
1009                 }
1010                 __split_whole_condition(stmt->if_conditional);
1011                 __split_stmt(stmt->if_true);
1012                 if (empty_statement(stmt->if_true) &&
1013                         last_stmt_on_same_line() &&
1014                         !get_macro_name(stmt->if_true->pos))
1015                         sm_msg("warn: if();");
1016                 __push_true_states();
1017                 __use_false_states();
1018                 __split_stmt(stmt->if_false);
1019                 __merge_true_states();
1020                 break;
1021         case STMT_ITERATOR:
1022                 stmt_set_parent_stmt(stmt->iterator_pre_statement, stmt);
1023                 stmt_set_parent_stmt(stmt->iterator_statement, stmt);
1024                 stmt_set_parent_stmt(stmt->iterator_post_statement, stmt);
1025
1026                 if (stmt->iterator_pre_condition)
1027                         handle_pre_loop(stmt);
1028                 else if (stmt->iterator_post_condition)
1029                         handle_post_loop(stmt);
1030                 else {
1031                         // these are for(;;) type loops.
1032                         handle_pre_loop(stmt);
1033                 }
1034                 break;
1035         case STMT_SWITCH:
1036                 stmt_set_parent_stmt(stmt->switch_statement, stmt);
1037
1038                 if (get_value(stmt->switch_expression, &sval)) {
1039                         split_known_switch(stmt, sval);
1040                         break;
1041                 }
1042                 __split_expr(stmt->switch_expression);
1043                 push_expression(&switch_expr_stack, stmt->switch_expression);
1044                 __save_switch_states(top_expression(switch_expr_stack));
1045                 nullify_path();
1046                 __push_default();
1047                 __push_breaks();
1048                 __split_stmt(stmt->switch_statement);
1049                 if (!__pop_default())
1050                         fake_an_empty_default(stmt->pos);
1051                 __discard_switches();
1052                 __merge_breaks();
1053                 pop_expression(&switch_expr_stack);
1054                 break;
1055         case STMT_CASE:
1056                 split_case(stmt);
1057                 break;
1058         case STMT_LABEL:
1059                 __split_label_stmt(stmt);
1060                 __split_stmt(stmt->label_statement);
1061                 break;
1062         case STMT_GOTO:
1063                 __split_expr(stmt->goto_expression);
1064                 if (stmt->goto_label && stmt->goto_label->type == SYM_NODE) {
1065                         if (!strcmp(stmt->goto_label->ident->name, "break")) {
1066                                 __process_breaks();
1067                         } else if (!strcmp(stmt->goto_label->ident->name,
1068                                            "continue")) {
1069                                 __process_continues();
1070                         }
1071                 } else if (stmt->goto_label &&
1072                            stmt->goto_label->type == SYM_LABEL &&
1073                            stmt->goto_label->ident) {
1074                         __save_gotos(stmt->goto_label->ident->name, stmt->goto_label);
1075                 }
1076                 nullify_path();
1077                 if (is_last_stmt(stmt))
1078                         handle_backward_goto(stmt);
1079                 break;
1080         case STMT_NONE:
1081                 break;
1082         case STMT_ASM:
1083                 find_asm_gotos(stmt);
1084                 __pass_to_client(stmt, ASM_HOOK);
1085                 __split_expr(stmt->asm_string);
1086                 split_asm_constraints(stmt->asm_outputs);
1087                 split_asm_constraints(stmt->asm_inputs);
1088                 split_asm_constraints(stmt->asm_clobbers);
1089                 break;
1090         case STMT_CONTEXT:
1091                 break;
1092         case STMT_RANGE:
1093                 __split_expr(stmt->range_expression);
1094                 __split_expr(stmt->range_low);
1095                 __split_expr(stmt->range_high);
1096                 break;
1097         }
1098         __pass_to_client(stmt, STMT_HOOK_AFTER);
1099 out:
1100         __process_post_op_stack();
1101 }
1102
1103 static void split_expr_list(struct expression_list *expr_list, struct expression *parent)
1104 {
1105         struct expression *expr;
1106
1107         FOR_EACH_PTR(expr_list, expr) {
1108                 expr_set_parent_expr(expr, parent);
1109                 __split_expr(expr);
1110                 __process_post_op_stack();
1111         } END_FOR_EACH_PTR(expr);
1112 }
1113
1114 static void split_sym(struct symbol *sym)
1115 {
1116         if (!sym)
1117                 return;
1118         if (!(sym->namespace & NS_SYMBOL))
1119                 return;
1120
1121         __split_stmt(sym->stmt);
1122         __split_expr(sym->array_size);
1123         split_symlist(sym->arguments);
1124         split_symlist(sym->symbol_list);
1125         __split_stmt(sym->inline_stmt);
1126         split_symlist(sym->inline_symbol_list);
1127 }
1128
1129 static void split_symlist(struct symbol_list *sym_list)
1130 {
1131         struct symbol *sym;
1132
1133         FOR_EACH_PTR(sym_list, sym) {
1134                 split_sym(sym);
1135         } END_FOR_EACH_PTR(sym);
1136 }
1137
1138 typedef void (fake_cb)(struct expression *expr);
1139
1140 static int member_to_number(struct expression *expr, struct ident *member)
1141 {
1142         struct symbol *type, *tmp;
1143         char *name;
1144         int i;
1145
1146         if (!member)
1147                 return -1;
1148         name = member->name;
1149
1150         type = get_type(expr);
1151         if (!type || type->type != SYM_STRUCT)
1152                 return -1;
1153
1154         i = -1;
1155         FOR_EACH_PTR(type->symbol_list, tmp) {
1156                 i++;
1157                 if (!tmp->ident)
1158                         continue;
1159                 if (strcmp(name, tmp->ident->name) == 0)
1160                         return i;
1161         } END_FOR_EACH_PTR(tmp);
1162         return -1;
1163 }
1164
1165 static struct ident *number_to_member(struct expression *expr, int num)
1166 {
1167         struct symbol *type, *member;
1168         int i = 0;
1169
1170         type = get_type(expr);
1171         if (!type || type->type != SYM_STRUCT)
1172                 return NULL;
1173
1174         FOR_EACH_PTR(type->symbol_list, member) {
1175                 if (i == num)
1176                         return member->ident;
1177                 i++;
1178         } END_FOR_EACH_PTR(member);
1179         return NULL;
1180 }
1181
1182 static void fake_element_assigns_helper(struct expression *array, struct expression_list *expr_list, fake_cb *fake_cb);
1183
1184 static void set_inner_struct_members(struct expression *expr, struct symbol *member)
1185 {
1186         struct expression *edge_member, *assign;
1187         struct symbol *base = get_real_base_type(member);
1188         struct symbol *tmp;
1189
1190         if (member->ident)
1191                 expr = member_expression(expr, '.', member->ident);
1192
1193         FOR_EACH_PTR(base->symbol_list, tmp) {
1194                 struct symbol *type;
1195
1196                 type = get_real_base_type(tmp);
1197                 if (!type)
1198                         continue;
1199
1200                 edge_member = member_expression(expr, '.', tmp->ident);
1201                 if (get_state_expr(SMATCH_EXTRA, edge_member))
1202                         continue;
1203
1204                 if (type->type == SYM_UNION || type->type == SYM_STRUCT) {
1205                         set_inner_struct_members(expr, tmp);
1206                         continue;
1207                 }
1208
1209                 if (!tmp->ident)
1210                         continue;
1211
1212                 assign = assign_expression(edge_member, zero_expr());
1213                 __split_expr(assign);
1214         } END_FOR_EACH_PTR(tmp);
1215
1216
1217 }
1218
1219 static void set_unset_to_zero(struct symbol *type, struct expression *expr)
1220 {
1221         struct symbol *tmp;
1222         struct expression *member = NULL;
1223         struct expression *assign;
1224         int op = '*';
1225
1226         if (expr->type == EXPR_PREOP && expr->op == '&') {
1227                 expr = strip_expr(expr->unop);
1228                 op = '.';
1229         }
1230
1231         FOR_EACH_PTR(type->symbol_list, tmp) {
1232                 type = get_real_base_type(tmp);
1233                 if (!type)
1234                         continue;
1235
1236                 if (tmp->ident) {
1237                         member = member_expression(expr, op, tmp->ident);
1238                         if (get_state_expr(SMATCH_EXTRA, member))
1239                                 continue;
1240                 }
1241
1242                 if (type->type == SYM_UNION || type->type == SYM_STRUCT) {
1243                         set_inner_struct_members(expr, tmp);
1244                         continue;
1245                 }
1246                 if (type->type == SYM_ARRAY)
1247                         continue;
1248                 if (!tmp->ident)
1249                         continue;
1250
1251                 assign = assign_expression(member, zero_expr());
1252                 __split_expr(assign);
1253         } END_FOR_EACH_PTR(tmp);
1254 }
1255
1256 static void fake_member_assigns_helper(struct expression *symbol, struct expression_list *members, fake_cb *fake_cb)
1257 {
1258         struct expression *deref, *assign, *tmp, *right;
1259         struct symbol *struct_type, *type;
1260         struct ident *member;
1261         int member_idx;
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         /*
1269          * We're parsing an initializer that could look something like this:
1270          * struct foo foo = {
1271          *      42,
1272          *      .whatever.xxx = 11,
1273          *      .zzz = 12,
1274          * };
1275          *
1276          * So what we have here is a list with 42, .whatever, and .zzz.  We need
1277          * to break it up into left and right sides of the assignments.
1278          *
1279          */
1280         member_idx = 0;
1281         FOR_EACH_PTR(members, tmp) {
1282                 deref = NULL;
1283                 if (tmp->type == EXPR_IDENTIFIER) {
1284                         member_idx = member_to_number(symbol, tmp->expr_ident);
1285                         while (tmp->type == EXPR_IDENTIFIER) {
1286                                 member = tmp->expr_ident;
1287                                 tmp = tmp->ident_expression;
1288                                 if (deref)
1289                                         deref = member_expression(deref, '.', member);
1290                                 else
1291                                         deref = member_expression(symbol, '.', member);
1292                         }
1293                 } else {
1294                         member = number_to_member(symbol, member_idx);
1295                         deref = member_expression(symbol, '.', member);
1296                 }
1297                 right = tmp;
1298                 member_idx++;
1299                 if (right->type == EXPR_INITIALIZER) {
1300                         type = get_type(deref);
1301                         if (type && type->type == SYM_ARRAY)
1302                                 fake_element_assigns_helper(deref, right->expr_list, fake_cb);
1303                         else
1304                                 fake_member_assigns_helper(deref, right->expr_list, fake_cb);
1305                 } else {
1306                         assign = assign_expression(deref, right);
1307                         fake_cb(assign);
1308                 }
1309         } END_FOR_EACH_PTR(tmp);
1310
1311         set_unset_to_zero(struct_type, symbol);
1312 }
1313
1314 static void fake_member_assigns(struct symbol *sym, fake_cb *fake_cb)
1315 {
1316         fake_member_assigns_helper(symbol_expression(sym),
1317                                    sym->initializer->expr_list, fake_cb);
1318 }
1319
1320 static void fake_element_assigns_helper(struct expression *array, struct expression_list *expr_list, fake_cb *fake_cb)
1321 {
1322         struct expression *offset, *binop, *assign, *tmp;
1323         struct symbol *type;
1324         int idx;
1325
1326         if (ptr_list_size((struct ptr_list *)expr_list) > 1000)
1327                 return;
1328
1329         idx = 0;
1330         FOR_EACH_PTR(expr_list, tmp) {
1331                 if (tmp->type == EXPR_INDEX) {
1332                         if (tmp->idx_from != tmp->idx_to)
1333                                 return;
1334                         idx = tmp->idx_from;
1335                         if (!tmp->idx_expression)
1336                                 goto next;
1337                         tmp = tmp->idx_expression;
1338                 }
1339                 offset = value_expr(idx);
1340                 binop = array_element_expression(array, offset);
1341                 if (tmp->type == EXPR_INITIALIZER) {
1342                         type = get_type(binop);
1343                         if (type && type->type == SYM_ARRAY)
1344                                 fake_element_assigns_helper(binop, tmp->expr_list, fake_cb);
1345                         else
1346                                 fake_member_assigns_helper(binop, tmp->expr_list, fake_cb);
1347                 } else {
1348                         assign = assign_expression(binop, tmp);
1349                         fake_cb(assign);
1350                 }
1351 next:
1352                 idx++;
1353         } END_FOR_EACH_PTR(tmp);
1354 }
1355
1356 static void fake_element_assigns(struct symbol *sym, fake_cb *fake_cb)
1357 {
1358         fake_element_assigns_helper(symbol_expression(sym), sym->initializer->expr_list, fake_cb);
1359 }
1360
1361 static void fake_assign_expr(struct symbol *sym)
1362 {
1363         struct expression *assign, *symbol;
1364
1365         symbol = symbol_expression(sym);
1366         assign = assign_expression(symbol, sym->initializer);
1367         __split_expr(assign);
1368 }
1369
1370 static void call_split_expr(struct expression *expr)
1371 {
1372         __split_expr(expr);
1373 }
1374
1375 static void do_initializer_stuff(struct symbol *sym)
1376 {
1377         if (!sym->initializer)
1378                 return;
1379
1380         if (sym->initializer->type == EXPR_INITIALIZER) {
1381                 if (get_real_base_type(sym)->type == SYM_ARRAY)
1382                         fake_element_assigns(sym, call_split_expr);
1383                 else
1384                         fake_member_assigns(sym, call_split_expr);
1385         } else {
1386                 fake_assign_expr(sym);
1387         }
1388 }
1389
1390 static void split_declaration(struct symbol_list *sym_list)
1391 {
1392         struct symbol *sym;
1393
1394         FOR_EACH_PTR(sym_list, sym) {
1395                 __pass_to_client(sym, DECLARATION_HOOK);
1396                 do_initializer_stuff(sym);
1397                 split_sym(sym);
1398         } END_FOR_EACH_PTR(sym);
1399 }
1400
1401 static void call_global_assign_hooks(struct expression *assign)
1402 {
1403         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1404 }
1405
1406 static void fake_global_assign(struct symbol *sym)
1407 {
1408         struct expression *assign, *symbol;
1409
1410         if (get_real_base_type(sym)->type == SYM_ARRAY) {
1411                 if (sym->initializer && sym->initializer->type == EXPR_INITIALIZER) {
1412                         fake_element_assigns(sym, call_global_assign_hooks);
1413                 } else if (sym->initializer) {
1414                         symbol = symbol_expression(sym);
1415                         assign = assign_expression(symbol, sym->initializer);
1416                         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1417                 } else {
1418                         fake_element_assigns_helper(symbol_expression(sym), NULL, call_global_assign_hooks);
1419                 }
1420         } else if (get_real_base_type(sym)->type == SYM_STRUCT) {
1421                 if (sym->initializer && sym->initializer->type == EXPR_INITIALIZER) {
1422                         fake_member_assigns(sym, call_global_assign_hooks);
1423                 } else if (sym->initializer) {
1424                         symbol = symbol_expression(sym);
1425                         assign = assign_expression(symbol, sym->initializer);
1426                         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1427                 } else {
1428                         fake_member_assigns_helper(symbol_expression(sym), NULL, call_global_assign_hooks);
1429                 }
1430         } else {
1431                 symbol = symbol_expression(sym);
1432                 if (sym->initializer)
1433                         assign = assign_expression(symbol, sym->initializer);
1434                 else
1435                         assign = assign_expression(symbol, zero_expr());
1436                 __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1437         }
1438 }
1439
1440 static void start_function_definition(struct symbol *sym)
1441 {
1442         __in_function_def = 1;
1443         __pass_to_client(sym, FUNC_DEF_HOOK);
1444         __in_function_def = 0;
1445         __pass_to_client(sym, AFTER_DEF_HOOK);
1446
1447 }
1448
1449 static void split_function(struct symbol *sym)
1450 {
1451         struct symbol *base_type = get_base_type(sym);
1452
1453         if (!base_type->stmt && !base_type->inline_stmt)
1454                 return;
1455
1456         gettimeofday(&fn_start_time, NULL);
1457         cur_func_sym = sym;
1458         if (sym->ident)
1459                 cur_func = sym->ident->name;
1460         set_position(sym->pos);
1461         loop_count = 0;
1462         last_goto_statement_handled = 0;
1463         sm_debug("new function:  %s\n", cur_func);
1464         __stree_id = 0;
1465         if (option_two_passes) {
1466                 __unnullify_path();
1467                 loop_num = 0;
1468                 final_pass = 0;
1469                 start_function_definition(sym);
1470                 __split_stmt(base_type->stmt);
1471                 __split_stmt(base_type->inline_stmt);
1472                 nullify_path();
1473         }
1474         __unnullify_path();
1475         loop_num = 0;
1476         final_pass = 1;
1477         start_function_definition(sym);
1478         __split_stmt(base_type->stmt);
1479         __split_stmt(base_type->inline_stmt);
1480         __pass_to_client(sym, END_FUNC_HOOK);
1481         if (need_delayed_scope_hooks())
1482                 __call_scope_hooks();
1483         __pass_to_client(sym, AFTER_FUNC_HOOK);
1484
1485         clear_all_states();
1486         cur_func_sym = NULL;
1487         cur_func = NULL;
1488         free_data_info_allocs();
1489         free_expression_stack(&switch_expr_stack);
1490         __free_ptr_list((struct ptr_list **)&big_statement_stack);
1491         __bail_on_rest_of_function = 0;
1492 }
1493
1494 static void parse_inline(struct expression *call)
1495 {
1496         struct symbol *base_type;
1497         int loop_num_bak = loop_num;
1498         int loop_count_bak = loop_count;
1499         int final_pass_bak = final_pass;
1500         char *cur_func_bak = cur_func;
1501         struct statement_list *big_statement_stack_bak = big_statement_stack;
1502         struct expression_list *big_expression_stack_bak = big_expression_stack;
1503         struct expression_list *big_condition_stack_bak = big_condition_stack;
1504         struct expression_list *switch_expr_stack_bak = switch_expr_stack;
1505         struct symbol *cur_func_sym_bak = cur_func_sym;
1506
1507         __pass_to_client(call, INLINE_FN_START);
1508         final_pass = 0;  /* don't print anything */
1509         __inline_fn = call;
1510
1511         base_type = get_base_type(call->fn->symbol);
1512         cur_func_sym = call->fn->symbol;
1513         if (call->fn->symbol->ident)
1514                 cur_func = call->fn->symbol->ident->name;
1515         else
1516                 cur_func = NULL;
1517         set_position(call->fn->symbol->pos);
1518
1519         save_all_states();
1520         big_statement_stack = NULL;
1521         big_expression_stack = NULL;
1522         big_condition_stack = NULL;
1523         switch_expr_stack = NULL;
1524
1525         sm_debug("inline function:  %s\n", cur_func);
1526         __unnullify_path();
1527         loop_num = 0;
1528         start_function_definition(call->fn->symbol);
1529         __split_stmt(base_type->stmt);
1530         __split_stmt(base_type->inline_stmt);
1531         __pass_to_client(call->fn->symbol, END_FUNC_HOOK);
1532         __pass_to_client(call->fn->symbol, AFTER_FUNC_HOOK);
1533
1534         free_expression_stack(&switch_expr_stack);
1535         __free_ptr_list((struct ptr_list **)&big_statement_stack);
1536         nullify_path();
1537         free_goto_stack();
1538
1539         loop_num = loop_num_bak;
1540         loop_count = loop_count_bak;
1541         final_pass = final_pass_bak;
1542         cur_func_sym = cur_func_sym_bak;
1543         cur_func = cur_func_bak;
1544         big_statement_stack = big_statement_stack_bak;
1545         big_expression_stack = big_expression_stack_bak;
1546         big_condition_stack = big_condition_stack_bak;
1547         switch_expr_stack = switch_expr_stack_bak;
1548
1549         restore_all_states();
1550         set_position(call->pos);
1551         __inline_fn = NULL;
1552         __pass_to_client(call, INLINE_FN_END);
1553 }
1554
1555 static struct symbol_list *inlines_called;
1556 static void add_inline_function(struct symbol *sym)
1557 {
1558         static struct symbol_list *already_added;
1559         struct symbol *tmp;
1560
1561         FOR_EACH_PTR(already_added, tmp) {
1562                 if (tmp == sym)
1563                         return;
1564         } END_FOR_EACH_PTR(tmp);
1565
1566         add_ptr_list(&already_added, sym);
1567         add_ptr_list(&inlines_called, sym);
1568 }
1569
1570 static void process_inlines(void)
1571 {
1572         struct symbol *tmp;
1573
1574         FOR_EACH_PTR(inlines_called, tmp) {
1575                 split_function(tmp);
1576         } END_FOR_EACH_PTR(tmp);
1577         free_ptr_list(&inlines_called);
1578 }
1579
1580 static struct symbol *get_last_scoped_symbol(struct symbol_list *big_list, int use_static)
1581 {
1582         struct symbol *sym;
1583
1584         FOR_EACH_PTR_REVERSE(big_list, sym) {
1585                 if (!sym->scope)
1586                         continue;
1587                 if (use_static && sym->ctype.modifiers & MOD_STATIC)
1588                         return sym;
1589                 if (!use_static && !(sym->ctype.modifiers & MOD_STATIC))
1590                         return sym;
1591         } END_FOR_EACH_PTR_REVERSE(sym);
1592
1593         return NULL;
1594 }
1595
1596 static void split_inlines_in_scope(struct symbol *sym)
1597 {
1598         struct symbol *base;
1599         struct symbol_list *scope_list;
1600         int stream;
1601
1602         scope_list = sym->scope->symbols;
1603         stream = sym->pos.stream;
1604
1605         /* find the last static symbol in the file */
1606         FOR_EACH_PTR_REVERSE(scope_list, sym) {
1607                 if (sym->pos.stream != stream)
1608                         continue;
1609                 if (sym->type != SYM_NODE)
1610                         continue;
1611                 base = get_base_type(sym);
1612                 if (!base)
1613                         continue;
1614                 if (base->type != SYM_FN)
1615                         continue;
1616                 if (!base->inline_stmt)
1617                         continue;
1618                 add_inline_function(sym);
1619         } END_FOR_EACH_PTR_REVERSE(sym);
1620
1621         process_inlines();
1622 }
1623
1624 static void split_inlines(struct symbol_list *sym_list)
1625 {
1626         struct symbol *sym;
1627
1628         sym = get_last_scoped_symbol(sym_list, 0);
1629         if (sym)
1630                 split_inlines_in_scope(sym);
1631         sym = get_last_scoped_symbol(sym_list, 1);
1632         if (sym)
1633                 split_inlines_in_scope(sym);
1634 }
1635
1636 static struct stree *clone_estates_perm(struct stree *orig)
1637 {
1638         struct stree *ret = NULL;
1639         struct sm_state *tmp;
1640
1641         FOR_EACH_SM(orig, tmp) {
1642                 set_state_stree_perm(&ret, tmp->owner, tmp->name, tmp->sym, clone_estate_perm(tmp->state));
1643         } END_FOR_EACH_SM(tmp);
1644
1645         return ret;
1646 }
1647
1648 struct position last_pos;
1649 static void split_functions(struct symbol_list *sym_list)
1650 {
1651         struct symbol *sym;
1652
1653         __unnullify_path();
1654         FOR_EACH_PTR(sym_list, sym) {
1655                 set_position(sym->pos);
1656                 if (sym->type != SYM_NODE || get_base_type(sym)->type != SYM_FN) {
1657                         __pass_to_client(sym, BASE_HOOK);
1658                         fake_global_assign(sym);
1659                 }
1660         } END_FOR_EACH_PTR(sym);
1661         global_states = clone_estates_perm(get_all_states_stree(SMATCH_EXTRA));
1662         nullify_path();
1663
1664         FOR_EACH_PTR(sym_list, sym) {
1665                 set_position(sym->pos);
1666                 if (sym->type == SYM_NODE && get_base_type(sym)->type == SYM_FN) {
1667                         split_function(sym);
1668                         process_inlines();
1669                 }
1670                 last_pos = sym->pos;
1671         } END_FOR_EACH_PTR(sym);
1672         split_inlines(sym_list);
1673         __pass_to_client(sym_list, END_FILE_HOOK);
1674 }
1675
1676 static int final_before_fake;
1677 void init_fake_env(void)
1678 {
1679         if (!in_fake_env)
1680                 final_before_fake = final_pass;
1681         in_fake_env++;
1682         __push_fake_cur_stree();
1683         final_pass = 0;
1684 }
1685
1686 void end_fake_env(void)
1687 {
1688         __pop_fake_cur_stree();
1689         in_fake_env--;
1690         if (!in_fake_env)
1691                 final_pass = final_before_fake;
1692 }
1693
1694 void smatch(int argc, char **argv)
1695 {
1696         struct string_list *filelist = NULL;
1697         struct symbol_list *sym_list;
1698         struct timeval stop, start;
1699
1700         gettimeofday(&start, NULL);
1701
1702         if (argc < 2) {
1703                 printf("Usage:  smatch [--debug] <filename.c>\n");
1704                 exit(1);
1705         }
1706         sparse_initialize(argc, argv, &filelist);
1707         set_valid_ptr_max();
1708         FOR_EACH_PTR_NOTAG(filelist, base_file) {
1709                 if (option_file_output) {
1710                         char buf[256];
1711
1712                         snprintf(buf, sizeof(buf), "%s.smatch", base_file);
1713                         sm_outfd = fopen(buf, "w");
1714                         if (!sm_outfd) {
1715                                 printf("Error:  Cannot open %s\n", base_file);
1716                                 exit(1);
1717                         }
1718                 }
1719                 sym_list = sparse_keep_tokens(base_file);
1720                 split_functions(sym_list);
1721         } END_FOR_EACH_PTR_NOTAG(base_file);
1722
1723         gettimeofday(&stop, NULL);
1724
1725         set_position(last_pos);
1726         if (option_time)
1727                 sm_msg("time: %lu", stop.tv_sec - start.tv_sec);
1728 }