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->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                 right = strip_expr(expr->right);
 355                 if (!right)
 356                         break;
 357
 358                 __pass_to_client(expr, RAW_ASSIGNMENT_HOOK);
 359
 360                 /* foo = !bar() */
 361                 if (__handle_condition_assigns(expr))
 362                         break;
 363                 /* foo = (x < 5 ? foo : 5); */
 364                 if (__handle_select_assigns(expr))
 365                         break;
 366                 /* foo = ({frob(); frob(); frob(); 1;}) */
 367                 if (__handle_expr_statement_assigns(expr))
 368                         break;
 369                 /* foo = (3, 4); */
 370                 if (handle_comma_assigns(expr))
 371                         break;
 372                 if (handle_postop_assigns(expr))
 373                         break;
 374
 375                 __split_expr(expr->right);
 376                 if (outside_of_function())
 377                         __pass_to_client(expr, GLOBAL_ASSIGNMENT_HOOK);
 378                 else
 379                         __pass_to_client(expr, ASSIGNMENT_HOOK);
 380
 381                 __fake_struct_member_assignments(expr);
 382
 383                 if (expr->op == '=' && right->type == EXPR_CALL)
 384                         __pass_to_client(expr, CALL_ASSIGNMENT_HOOK);
 385
 386                 if (get_macro_name(right->pos) &&
 387                     get_macro_name(expr->pos) != get_macro_name(right->pos))
 388                         __pass_to_client(expr, MACRO_ASSIGNMENT_HOOK);
 389
 390                 __pass_to_client(expr, ASSIGNMENT_HOOK_AFTER);
 391
 392                 __split_expr(expr->left);
 393                 break;
 394         }
 395         case EXPR_DEREF:
 396                 expr_set_parent_expr(expr->deref, expr);
 397
 398                 __pass_to_client(expr, DEREF_HOOK);
 399                 __split_expr(expr->deref);
 400                 break;
 401         case EXPR_SLICE:
 402                 expr_set_parent_expr(expr->base, expr);
 403
 404                 __split_expr(expr->base);
 405                 break;
 406         case EXPR_CAST:
 407         case EXPR_FORCE_CAST:
 408                 expr_set_parent_expr(expr->cast_expression, expr);
 409
 410                 __pass_to_client(expr, CAST_HOOK);
 411                 __split_expr(expr->cast_expression);
 412                 break;
 413         case EXPR_SIZEOF:
 414                 if (expr->cast_expression)
 415                         __pass_to_client(strip_parens(expr->cast_expression),
 416                                          SIZEOF_HOOK);
 417                 break;
 418         case EXPR_OFFSETOF:
 419         case EXPR_ALIGNOF:
 420                 evaluate_expression(expr);
 421                 break;
 422         case EXPR_CONDITIONAL:
 423         case EXPR_SELECT:
 424                 expr_set_parent_expr(expr->conditional, expr);
 425                 expr_set_parent_expr(expr->cond_true, expr);
 426                 expr_set_parent_expr(expr->cond_false, expr);
 427
 428                 if (known_condition_true(expr->conditional)) {
 429                         __split_expr(expr->cond_true);
 430                         break;
 431                 }
 432                 if (known_condition_false(expr->conditional)) {
 433                         __split_expr(expr->cond_false);
 434                         break;
 435                 }
 436                 __pass_to_client(expr, SELECT_HOOK);
 437                 __split_whole_condition(expr->conditional);
 438                 __split_expr(expr->cond_true);
 439                 __push_true_states();
 440                 __use_false_states();
 441                 __split_expr(expr->cond_false);
 442                 __merge_true_states();
 443                 break;
 444         case EXPR_CALL:
 445                 expr_set_parent_expr(expr->fn, expr);
 446
 447                 if (sym_name_is("__builtin_constant_p", expr->fn))
 448                         break;
 449                 split_expr_list(expr->args, expr);
 450                 __split_expr(expr->fn);
 451                 if (is_inline_func(expr->fn))
 452                         add_inline_function(expr->fn->symbol);
 453                 if (inlinable(expr->fn))
 454                         __inline_call = 1;
 455                 __process_post_op_stack();
 456                 __pass_to_client(expr, FUNCTION_CALL_HOOK);
 457                 __inline_call = 0;
 458                 if (inlinable(expr->fn)) {
 459                         parse_inline(expr);
 460                 }
 461                 __pass_to_client(expr, CALL_HOOK_AFTER_INLINE);
 462                 if (is_noreturn_func(expr->fn))
 463                         nullify_path();
 464                 break;
 465         case EXPR_INITIALIZER:
 466                 split_expr_list(expr->expr_list, expr);
 467                 break;
 468         case EXPR_IDENTIFIER:
 469                 expr_set_parent_expr(expr->ident_expression, expr);
 470                 __split_expr(expr->ident_expression);
 471                 break;
 472         case EXPR_INDEX:
 473                 expr_set_parent_expr(expr->idx_expression, expr);
 474                 __split_expr(expr->idx_expression);
 475                 break;
 476         case EXPR_POS:
 477                 expr_set_parent_expr(expr->init_expr, expr);
 478                 __split_expr(expr->init_expr);
 479                 break;
 480         case EXPR_SYMBOL:
 481                 __pass_to_client(expr, SYM_HOOK);
 482                 break;
 483         case EXPR_STRING:
 484                 __pass_to_client(expr, STRING_HOOK);
 485                 break;
 486         default:
 487                 break;
 488         };
 489         pop_expression(&big_expression_stack);
 490 }
 491
 492 static int is_forever_loop(struct statement *stmt)
 493 {
 494         struct expression *expr;
 495         sval_t sval;
 496
 497         expr = strip_expr(stmt->iterator_pre_condition);
 498         if (!expr)
 499                 expr = stmt->iterator_post_condition;
 500         if (!expr) {
 501                 /* this is a for(;;) loop... */
 502                 return 1;
 503         }
 504
 505         if (get_value(expr, &sval) && sval.value != 0)
 506                 return 1;
 507
 508         return 0;
 509 }
 510
 511 static int loop_num;
 512 static char *get_loop_name(int num)
 513 {
 514         char buf[256];
 515
 516         snprintf(buf, 255, "-loop%d", num);
 517         buf[255] = '\0';
 518         return alloc_sname(buf);
 519 }
 520
 521 /*
 522  * Pre Loops are while and for loops.
 523  */
 524 static void handle_pre_loop(struct statement *stmt)
 525 {
 526         int once_through; /* we go through the loop at least once */
 527         struct sm_state *extra_sm = NULL;
 528         int unchanged = 0;
 529         char *loop_name;
 530         struct stree *stree = NULL;
 531         struct sm_state *sm = NULL;
 532
 533         loop_name = get_loop_name(loop_num);
 534         loop_num++;
 535
 536         __split_stmt(stmt->iterator_pre_statement);
 537         __prev_stmt = stmt->iterator_pre_statement;
 538
 539         once_through = implied_condition_true(stmt->iterator_pre_condition);
 540
 541         loop_count++;
 542         __push_continues();
 543         __push_breaks();
 544
 545         __merge_gotos(loop_name, NULL);
 546
 547         extra_sm = __extra_handle_canonical_loops(stmt, &stree);
 548         __in_pre_condition++;
 549         __pass_to_client(stmt, PRELOOP_HOOK);
 550         __split_whole_condition(stmt->iterator_pre_condition);
 551         __in_pre_condition--;
 552         FOR_EACH_SM(stree, sm) {
 553                 set_state(sm->owner, sm->name, sm->sym, sm->state);
 554         } END_FOR_EACH_SM(sm);
 555         free_stree(&stree);
 556         if (extra_sm)
 557                 extra_sm = get_sm_state(extra_sm->owner, extra_sm->name, extra_sm->sym);
 558
 559         if (option_assume_loops)
 560                 once_through = 1;
 561
 562         __split_stmt(stmt->iterator_statement);
 563         if (is_forever_loop(stmt)) {
 564                 __merge_continues();
 565                 __save_gotos(loop_name, NULL);
 566
 567                 __push_fake_cur_stree();
 568                 __split_stmt(stmt->iterator_post_statement);
 569                 stree = __pop_fake_cur_stree();
 570
 571                 __discard_false_states();
 572                 __use_breaks();
 573
 574                 if (!__path_is_null())
 575                         __merge_stree_into_cur(stree);
 576                 free_stree(&stree);
 577         } else {
 578                 __merge_continues();
 579                 unchanged = __iterator_unchanged(extra_sm);
 580                 __split_stmt(stmt->iterator_post_statement);
 581                 __prev_stmt = stmt->iterator_post_statement;
 582                 __cur_stmt = stmt;
 583
 584                 __save_gotos(loop_name, NULL);
 585                 __in_pre_condition++;
 586                 __split_whole_condition(stmt->iterator_pre_condition);
 587                 __in_pre_condition--;
 588                 nullify_path();
 589                 __merge_false_states();
 590                 if (once_through)
 591                         __discard_false_states();
 592                 else
 593                         __merge_false_states();
 594
 595                 if (extra_sm && unchanged)
 596                         __extra_pre_loop_hook_after(extra_sm,
 597                                                 stmt->iterator_post_statement,
 598                                                 stmt->iterator_pre_condition);
 599                 __merge_breaks();
 600         }
 601         loop_count--;
 602 }
 603
 604 /*
 605  * Post loops are do {} while();
 606  */
 607 static void handle_post_loop(struct statement *stmt)
 608 {
 609         char *loop_name;
 610
 611         loop_name = get_loop_name(loop_num);
 612         loop_num++;
 613         loop_count++;
 614
 615         __push_continues();
 616         __push_breaks();
 617         __merge_gotos(loop_name, NULL);
 618         __split_stmt(stmt->iterator_statement);
 619         __merge_continues();
 620         if (!is_zero(stmt->iterator_post_condition))
 621                 __save_gotos(loop_name, NULL);
 622
 623         if (is_forever_loop(stmt)) {
 624                 __use_breaks();
 625         } else {
 626                 __split_whole_condition(stmt->iterator_post_condition);
 627                 __use_false_states();
 628                 __merge_breaks();
 629         }
 630         loop_count--;
 631 }
 632
 633 static int empty_statement(struct statement *stmt)
 634 {
 635         if (!stmt)
 636                 return 0;
 637         if (stmt->type == STMT_EXPRESSION && !stmt->expression)
 638                 return 1;
 639         return 0;
 640 }
 641
 642 static int last_stmt_on_same_line(void)
 643 {
 644         struct statement *stmt;
 645         int i = 0;
 646
 647         FOR_EACH_PTR_REVERSE(big_statement_stack, stmt) {
 648                 if (!i++)
 649                         continue;
 650                 if  (stmt->pos.line == get_lineno())
 651                         return 1;
 652                 return 0;
 653         } END_FOR_EACH_PTR_REVERSE(stmt);
 654         return 0;
 655 }
 656
 657 static void split_asm_constraints(struct expression_list *expr_list)
 658 {
 659         struct expression *expr;
 660         int state = 0;
 661
 662         FOR_EACH_PTR(expr_list, expr) {
 663                 switch (state) {
 664                 case 0: /* identifier */
 665                 case 1: /* constraint */
 666                         state++;
 667                         continue;
 668                 case 2: /* expression */
 669                         state = 0;
 670                         __split_expr(expr);
 671                         continue;
 672                 }
 673         } END_FOR_EACH_PTR(expr);
 674 }
 675
 676 static int is_case_val(struct statement *stmt, sval_t sval)
 677 {
 678         sval_t case_sval;
 679
 680         if (stmt->type != STMT_CASE)
 681                 return 0;
 682         if (!stmt->case_expression) {
 683                 __set_default();
 684                 return 1;
 685         }
 686         if (!get_value(stmt->case_expression, &case_sval))
 687                 return 0;
 688         if (case_sval.value == sval.value)
 689                 return 1;
 690         return 0;
 691 }
 692
 693 static struct range_list *get_case_rl(struct expression *switch_expr,
 694                                       struct expression *case_expr,
 695                                       struct expression *case_to)
 696 {
 697         sval_t start, end;
 698         struct range_list *rl = NULL;
 699         struct symbol *switch_type;
 700
 701         switch_type = get_type(switch_expr);
 702         if (get_value(case_to, &end) && get_value(case_expr, &start)) {
 703                 start = sval_cast(switch_type, start);
 704                 end = sval_cast(switch_type, end);
 705                 add_range(&rl, start, end);
 706         } else if (get_value(case_expr, &start)) {
 707                 start = sval_cast(switch_type, start);
 708                 add_range(&rl, start, start);
 709         }
 710
 711         return rl;
 712 }
 713
 714 static void split_known_switch(struct statement *stmt, sval_t sval)
 715 {
 716         struct statement *tmp;
 717         struct range_list *rl;
 718
 719         __split_expr(stmt->switch_expression);
 720         sval = sval_cast(get_type(stmt->switch_expression), sval);
 721
 722         push_expression(&switch_expr_stack, stmt->switch_expression);
 723         __save_switch_states(top_expression(switch_expr_stack));
 724         nullify_path();
 725         __push_default();
 726         __push_breaks();
 727
 728         stmt = stmt->switch_statement;
 729
 730         __push_scope_hooks();
 731         FOR_EACH_PTR(stmt->stmts, tmp) {
 732                 __smatch_lineno = tmp->pos.line;
 733                 if (is_case_val(tmp, sval)) {
 734                         rl = alloc_rl(sval, sval);
 735                         __merge_switches(top_expression(switch_expr_stack), rl);
 736                         __pass_case_to_client(top_expression(switch_expr_stack), rl);
 737                 }
 738                 if (__path_is_null())
 739                         continue;
 740                 __split_stmt(tmp);
 741                 if (__path_is_null()) {
 742                         __set_default();
 743                         goto out;
 744                 }
 745         } END_FOR_EACH_PTR(tmp);
 746 out:
 747         __call_scope_hooks();
 748         if (!__pop_default())
 749                 __merge_switches(top_expression(switch_expr_stack), NULL);
 750         __discard_switches();
 751         __merge_breaks();
 752         pop_expression(&switch_expr_stack);
 753 }
 754
 755 static void split_case(struct statement *stmt)
 756 {
 757         struct range_list *rl = NULL;
 758
 759         expr_set_parent_stmt(stmt->case_expression, stmt);
 760         expr_set_parent_stmt(stmt->case_to, stmt);
 761
 762         rl = get_case_rl(top_expression(switch_expr_stack),
 763                          stmt->case_expression, stmt->case_to);
 764         while (stmt->case_statement->type == STMT_CASE) {
 765                 struct range_list *tmp;
 766
 767                 tmp = get_case_rl(top_expression(switch_expr_stack),
 768                                   stmt->case_statement->case_expression,
 769                                   stmt->case_statement->case_to);
 770                 if (!tmp)
 771                         break;
 772                 rl = rl_union(rl, tmp);
 773                 if (!stmt->case_expression)
 774                         __set_default();
 775                 stmt = stmt->case_statement;
 776         }
 777
 778         __merge_switches(top_expression(switch_expr_stack), rl);
 779
 780         if (!stmt->case_expression)
 781                 __set_default();
 782         __split_stmt(stmt->case_statement);
 783 }
 784
 785 static int taking_too_long(void)
 786 {
 787         int ms;
 788
 789         ms = ms_since(&fn_start_time);
 790         if (ms > 1000 * 60 * 5)  /* five minutes */
 791                 return 1;
 792         return 0;
 793 }
 794
 795 static int is_last_stmt(struct statement *cur_stmt)
 796 {
 797         struct symbol *fn = get_base_type(cur_func_sym);
 798         struct statement *stmt;
 799
 800         if (!fn)
 801                 return 0;
 802         stmt = fn->stmt;
 803         if (!stmt)
 804                 stmt = fn->inline_stmt;
 805         if (!stmt || stmt->type != STMT_COMPOUND)
 806                 return 0;
 807         stmt = last_ptr_list((struct ptr_list *)stmt->stmts);
 808         if (stmt && stmt->type == STMT_LABEL)
 809                 stmt = stmt->label_statement;
 810         if (stmt == cur_stmt)
 811                 return 1;
 812         return 0;
 813 }
 814
 815 static void handle_backward_goto(struct statement *goto_stmt)
 816 {
 817         const char *goto_name, *label_name;
 818         struct statement *func_stmt;
 819         struct symbol *base_type = get_base_type(cur_func_sym);
 820         struct statement *tmp;
 821         int found = 0;
 822
 823         if (!option_info)
 824                 return;
 825         if (last_goto_statement_handled)
 826                 return;
 827         last_goto_statement_handled = 1;
 828
 829         if (!goto_stmt->goto_label ||
 830             goto_stmt->goto_label->type != SYM_LABEL ||
 831             !goto_stmt->goto_label->ident)
 832                 return;
 833         goto_name = goto_stmt->goto_label->ident->name;
 834
 835         func_stmt = base_type->stmt;
 836         if (!func_stmt)
 837                 func_stmt = base_type->inline_stmt;
 838         if (!func_stmt)
 839                 return;
 840         if (func_stmt->type != STMT_COMPOUND)
 841                 return;
 842
 843         FOR_EACH_PTR(func_stmt->stmts, tmp) {
 844                 if (!found) {
 845                         if (tmp->type != STMT_LABEL)
 846                                 continue;
 847                         if (!tmp->label_identifier ||
 848                             tmp->label_identifier->type != SYM_LABEL ||
 849                             !tmp->label_identifier->ident)
 850                                 continue;
 851                         label_name = tmp->label_identifier->ident->name;
 852                         if (strcmp(goto_name, label_name) != 0)
 853                                 continue;
 854                         found = 1;
 855                 }
 856                 __split_stmt(tmp);
 857         } END_FOR_EACH_PTR(tmp);
 858 }
 859
 860 static void fake_a_return(void)
 861 {
 862         struct symbol *return_type;
 863
 864         nullify_path();
 865         __unnullify_path();
 866
 867         return_type = get_real_base_type(cur_func_sym);
 868         return_type = get_real_base_type(return_type);
 869         if (return_type != &void_ctype) {
 870                 __pass_to_client(unknown_value_expression(NULL), RETURN_HOOK);
 871                 nullify_path();
 872         }
 873 }
 874
 875 static void fake_an_empty_default(struct position pos)
 876 {
 877         static struct statement none = {};
 878
 879         none.pos = pos;
 880         none.type = STMT_NONE;
 881         __merge_switches(top_expression(switch_expr_stack), NULL);
 882         __split_stmt(&none);
 883 }
 884
 885 static void split_compound(struct statement *stmt)
 886 {
 887         struct statement *prev = NULL;
 888         struct statement *cur = NULL;
 889         struct statement *next;
 890
 891         __push_scope_hooks();
 892
 893         FOR_EACH_PTR(stmt->stmts, next) {
 894                 /* just set them all ahead of time */
 895                 stmt_set_parent_stmt(next, stmt);
 896
 897                 if (cur) {
 898                         __prev_stmt = prev;
 899                         __next_stmt = next;
 900                         __cur_stmt = cur;
 901                         __split_stmt(cur);
 902                 }
 903                 prev = cur;
 904                 cur = next;
 905         } END_FOR_EACH_PTR(next);
 906         if (cur) {
 907                 __prev_stmt = prev;
 908                 __cur_stmt = cur;
 909                 __next_stmt = NULL;
 910                 __split_stmt(cur);
 911         }
 912
 913         /*
 914          * For function scope, then delay calling the scope hooks until the
 915          * end of function hooks can run.  I'm not positive this is the right
 916          * thing...
 917          */
 918         if (!is_last_stmt(cur))
 919                 __call_scope_hooks();
 920 }
 921
 922 /*
 923  * This is a hack, work around for detecting empty functions.
 924  */
 925 static int need_delayed_scope_hooks(void)
 926 {
 927         struct symbol *fn = get_base_type(cur_func_sym);
 928         struct statement *stmt;
 929
 930         if (!fn)
 931                 return 0;
 932         stmt = fn->stmt;
 933         if (!stmt)
 934                 stmt = fn->inline_stmt;
 935         if (stmt && stmt->type == STMT_COMPOUND)
 936                 return 1;
 937         return 0;
 938 }
 939
 940 void __split_label_stmt(struct statement *stmt)
 941 {
 942         if (stmt->label_identifier &&
 943             stmt->label_identifier->type == SYM_LABEL &&
 944             stmt->label_identifier->ident) {
 945                 loop_count |= 0x80000000;
 946                 __merge_gotos(stmt->label_identifier->ident->name, stmt->label_identifier);
 947         }
 948 }
 949
 950 static void find_asm_gotos(struct statement *stmt)
 951 {
 952         struct symbol *sym;
 953
 954         FOR_EACH_PTR(stmt->asm_labels, sym) {
 955                 __save_gotos(sym->ident->name, sym);
 956         } END_FOR_EACH_PTR(sym);
 957 }
 958
 959 void __split_stmt(struct statement *stmt)
 960 {
 961         sval_t sval;
 962
 963         if (!stmt)
 964                 goto out;
 965
 966         if (__bail_on_rest_of_function)
 967                 return;
 968
 969         if (out_of_memory() || taking_too_long()) {
 970                 struct timeval stop;
 971
 972                 gettimeofday(&stop, NULL);
 973
 974                 __bail_on_rest_of_function = 1;
 975                 final_pass = 1;
 976                 sm_msg("Function too hairy.  Giving up. %lu seconds",
 977                        stop.tv_sec - fn_start_time.tv_sec);
 978                 fake_a_return();
 979                 final_pass = 0;  /* turn off sm_msg() from here */
 980                 return;
 981         }
 982
 983         add_ptr_list(&big_statement_stack, stmt);
 984         free_expression_stack(&big_expression_stack);
 985         set_position(stmt->pos);
 986         __pass_to_client(stmt, STMT_HOOK);
 987
 988         switch (stmt->type) {
 989         case STMT_DECLARATION:
 990                 split_declaration(stmt->declaration);
 991                 break;
 992         case STMT_RETURN:
 993                 expr_set_parent_stmt(stmt->ret_value, stmt);
 994
 995                 __split_expr(stmt->ret_value);
 996                 __pass_to_client(stmt->ret_value, RETURN_HOOK);
 997                 __process_post_op_stack();
 998                 nullify_path();
 999                 break;
1000         case STMT_EXPRESSION:
1001                 expr_set_parent_stmt(stmt->expression, stmt);
1002                 expr_set_parent_stmt(stmt->context, stmt);
1003
1004                 __split_expr(stmt->expression);
1005                 break;
1006         case STMT_COMPOUND:
1007                 split_compound(stmt);
1008                 break;
1009         case STMT_IF:
1010                 stmt_set_parent_stmt(stmt->if_true, stmt);
1011                 stmt_set_parent_stmt(stmt->if_false, stmt);
1012                 expr_set_parent_stmt(stmt->if_conditional, stmt);
1013
1014                 if (known_condition_true(stmt->if_conditional)) {
1015                         __split_stmt(stmt->if_true);
1016                         break;
1017                 }
1018                 if (known_condition_false(stmt->if_conditional)) {
1019                         __split_stmt(stmt->if_false);
1020                         break;
1021                 }
1022                 __split_whole_condition(stmt->if_conditional);
1023                 __split_stmt(stmt->if_true);
1024                 if (empty_statement(stmt->if_true) &&
1025                         last_stmt_on_same_line() &&
1026                         !get_macro_name(stmt->if_true->pos))
1027                         sm_msg("warn: if();");
1028                 __push_true_states();
1029                 __use_false_states();
1030                 __split_stmt(stmt->if_false);
1031                 __merge_true_states();
1032                 break;
1033         case STMT_ITERATOR:
1034                 stmt_set_parent_stmt(stmt->iterator_pre_statement, stmt);
1035                 stmt_set_parent_stmt(stmt->iterator_statement, stmt);
1036                 stmt_set_parent_stmt(stmt->iterator_post_statement, stmt);
1037                 expr_set_parent_stmt(stmt->iterator_pre_condition, stmt);
1038                 expr_set_parent_stmt(stmt->iterator_post_condition, stmt);
1039
1040                 if (stmt->iterator_pre_condition)
1041                         handle_pre_loop(stmt);
1042                 else if (stmt->iterator_post_condition)
1043                         handle_post_loop(stmt);
1044                 else {
1045                         // these are for(;;) type loops.
1046                         handle_pre_loop(stmt);
1047                 }
1048                 break;
1049         case STMT_SWITCH:
1050                 stmt_set_parent_stmt(stmt->switch_statement, stmt);
1051                 expr_set_parent_stmt(stmt->switch_expression, stmt);
1052
1053                 if (get_value(stmt->switch_expression, &sval)) {
1054                         split_known_switch(stmt, sval);
1055                         break;
1056                 }
1057                 __split_expr(stmt->switch_expression);
1058                 push_expression(&switch_expr_stack, stmt->switch_expression);
1059                 __save_switch_states(top_expression(switch_expr_stack));
1060                 nullify_path();
1061                 __push_default();
1062                 __push_breaks();
1063                 __split_stmt(stmt->switch_statement);
1064                 if (!__pop_default())
1065                         fake_an_empty_default(stmt->pos);
1066                 __discard_switches();
1067                 __merge_breaks();
1068                 pop_expression(&switch_expr_stack);
1069                 break;
1070         case STMT_CASE:
1071                 split_case(stmt);
1072                 break;
1073         case STMT_LABEL:
1074                 __split_label_stmt(stmt);
1075                 __split_stmt(stmt->label_statement);
1076                 break;
1077         case STMT_GOTO:
1078                 expr_set_parent_stmt(stmt->goto_expression, stmt);
1079
1080                 __split_expr(stmt->goto_expression);
1081                 if (stmt->goto_label && stmt->goto_label->type == SYM_NODE) {
1082                         if (!strcmp(stmt->goto_label->ident->name, "break")) {
1083                                 __process_breaks();
1084                         } else if (!strcmp(stmt->goto_label->ident->name,
1085                                            "continue")) {
1086                                 __process_continues();
1087                         }
1088                 } else if (stmt->goto_label &&
1089                            stmt->goto_label->type == SYM_LABEL &&
1090                            stmt->goto_label->ident) {
1091                         __save_gotos(stmt->goto_label->ident->name, stmt->goto_label);
1092                 }
1093                 nullify_path();
1094                 if (is_last_stmt(stmt))
1095                         handle_backward_goto(stmt);
1096                 break;
1097         case STMT_NONE:
1098                 break;
1099         case STMT_ASM:
1100                 expr_set_parent_stmt(stmt->asm_string, stmt);
1101
1102                 find_asm_gotos(stmt);
1103                 __pass_to_client(stmt, ASM_HOOK);
1104                 __split_expr(stmt->asm_string);
1105                 split_asm_constraints(stmt->asm_outputs);
1106                 split_asm_constraints(stmt->asm_inputs);
1107                 split_asm_constraints(stmt->asm_clobbers);
1108                 break;
1109         case STMT_CONTEXT:
1110                 break;
1111         case STMT_RANGE:
1112                 __split_expr(stmt->range_expression);
1113                 __split_expr(stmt->range_low);
1114                 __split_expr(stmt->range_high);
1115                 break;
1116         }
1117         __pass_to_client(stmt, STMT_HOOK_AFTER);
1118 out:
1119         __process_post_op_stack();
1120 }
1121
1122 static void split_expr_list(struct expression_list *expr_list, struct expression *parent)
1123 {
1124         struct expression *expr;
1125
1126         FOR_EACH_PTR(expr_list, expr) {
1127                 expr_set_parent_expr(expr, parent);
1128                 __split_expr(expr);
1129                 __process_post_op_stack();
1130         } END_FOR_EACH_PTR(expr);
1131 }
1132
1133 static void split_sym(struct symbol *sym)
1134 {
1135         if (!sym)
1136                 return;
1137         if (!(sym->namespace & NS_SYMBOL))
1138                 return;
1139
1140         __split_stmt(sym->stmt);
1141         __split_expr(sym->array_size);
1142         split_symlist(sym->arguments);
1143         split_symlist(sym->symbol_list);
1144         __split_stmt(sym->inline_stmt);
1145         split_symlist(sym->inline_symbol_list);
1146 }
1147
1148 static void split_symlist(struct symbol_list *sym_list)
1149 {
1150         struct symbol *sym;
1151
1152         FOR_EACH_PTR(sym_list, sym) {
1153                 split_sym(sym);
1154         } END_FOR_EACH_PTR(sym);
1155 }
1156
1157 typedef void (fake_cb)(struct expression *expr);
1158
1159 static int member_to_number(struct expression *expr, struct ident *member)
1160 {
1161         struct symbol *type, *tmp;
1162         char *name;
1163         int i;
1164
1165         if (!member)
1166                 return -1;
1167         name = member->name;
1168
1169         type = get_type(expr);
1170         if (!type || type->type != SYM_STRUCT)
1171                 return -1;
1172
1173         i = -1;
1174         FOR_EACH_PTR(type->symbol_list, tmp) {
1175                 i++;
1176                 if (!tmp->ident)
1177                         continue;
1178                 if (strcmp(name, tmp->ident->name) == 0)
1179                         return i;
1180         } END_FOR_EACH_PTR(tmp);
1181         return -1;
1182 }
1183
1184 static struct ident *number_to_member(struct expression *expr, int num)
1185 {
1186         struct symbol *type, *member;
1187         int i = 0;
1188
1189         type = get_type(expr);
1190         if (!type || type->type != SYM_STRUCT)
1191                 return NULL;
1192
1193         FOR_EACH_PTR(type->symbol_list, member) {
1194                 if (i == num)
1195                         return member->ident;
1196                 i++;
1197         } END_FOR_EACH_PTR(member);
1198         return NULL;
1199 }
1200
1201 static void fake_element_assigns_helper(struct expression *array, struct expression_list *expr_list, fake_cb *fake_cb);
1202
1203 static void set_inner_struct_members(struct expression *expr, struct symbol *member)
1204 {
1205         struct expression *edge_member, *assign;
1206         struct symbol *base = get_real_base_type(member);
1207         struct symbol *tmp;
1208
1209         if (member->ident)
1210                 expr = member_expression(expr, '.', member->ident);
1211
1212         FOR_EACH_PTR(base->symbol_list, tmp) {
1213                 struct symbol *type;
1214
1215                 type = get_real_base_type(tmp);
1216                 if (!type)
1217                         continue;
1218
1219                 edge_member = member_expression(expr, '.', tmp->ident);
1220                 if (get_state_expr(SMATCH_EXTRA, edge_member))
1221                         continue;
1222
1223                 if (type->type == SYM_UNION || type->type == SYM_STRUCT) {
1224                         set_inner_struct_members(expr, tmp);
1225                         continue;
1226                 }
1227
1228                 if (!tmp->ident)
1229                         continue;
1230
1231                 assign = assign_expression(edge_member, zero_expr());
1232                 __split_expr(assign);
1233         } END_FOR_EACH_PTR(tmp);
1234
1235
1236 }
1237
1238 static void set_unset_to_zero(struct symbol *type, struct expression *expr)
1239 {
1240         struct symbol *tmp;
1241         struct expression *member = NULL;
1242         struct expression *assign;
1243         int op = '*';
1244
1245         if (expr->type == EXPR_PREOP && expr->op == '&') {
1246                 expr = strip_expr(expr->unop);
1247                 op = '.';
1248         }
1249
1250         FOR_EACH_PTR(type->symbol_list, tmp) {
1251                 type = get_real_base_type(tmp);
1252                 if (!type)
1253                         continue;
1254
1255                 if (tmp->ident) {
1256                         member = member_expression(expr, op, tmp->ident);
1257                         if (get_state_expr(SMATCH_EXTRA, member))
1258                                 continue;
1259                 }
1260
1261                 if (type->type == SYM_UNION || type->type == SYM_STRUCT) {
1262                         set_inner_struct_members(expr, tmp);
1263                         continue;
1264                 }
1265                 if (type->type == SYM_ARRAY)
1266                         continue;
1267                 if (!tmp->ident)
1268                         continue;
1269
1270                 assign = assign_expression(member, zero_expr());
1271                 __split_expr(assign);
1272         } END_FOR_EACH_PTR(tmp);
1273 }
1274
1275 static void fake_member_assigns_helper(struct expression *symbol, struct expression_list *members, fake_cb *fake_cb)
1276 {
1277         struct expression *deref, *assign, *tmp, *right;
1278         struct symbol *struct_type, *type;
1279         struct ident *member;
1280         int member_idx;
1281
1282         struct_type = get_type(symbol);
1283         if (!struct_type ||
1284             (struct_type->type != SYM_STRUCT && struct_type->type != SYM_UNION))
1285                 return;
1286
1287         /*
1288          * We're parsing an initializer that could look something like this:
1289          * struct foo foo = {
1290          *      42,
1291          *      .whatever.xxx = 11,
1292          *      .zzz = 12,
1293          * };
1294          *
1295          * So what we have here is a list with 42, .whatever, and .zzz.  We need
1296          * to break it up into left and right sides of the assignments.
1297          *
1298          */
1299         member_idx = 0;
1300         FOR_EACH_PTR(members, tmp) {
1301                 deref = NULL;
1302                 if (tmp->type == EXPR_IDENTIFIER) {
1303                         member_idx = member_to_number(symbol, tmp->expr_ident);
1304                         while (tmp->type == EXPR_IDENTIFIER) {
1305                                 member = tmp->expr_ident;
1306                                 tmp = tmp->ident_expression;
1307                                 if (deref)
1308                                         deref = member_expression(deref, '.', member);
1309                                 else
1310                                         deref = member_expression(symbol, '.', member);
1311                         }
1312                 } else {
1313                         member = number_to_member(symbol, member_idx);
1314                         deref = member_expression(symbol, '.', member);
1315                 }
1316                 right = tmp;
1317                 member_idx++;
1318                 if (right->type == EXPR_INITIALIZER) {
1319                         type = get_type(deref);
1320                         if (type && type->type == SYM_ARRAY)
1321                                 fake_element_assigns_helper(deref, right->expr_list, fake_cb);
1322                         else
1323                                 fake_member_assigns_helper(deref, right->expr_list, fake_cb);
1324                 } else {
1325                         assign = assign_expression(deref, right);
1326                         fake_cb(assign);
1327                 }
1328         } END_FOR_EACH_PTR(tmp);
1329
1330         set_unset_to_zero(struct_type, symbol);
1331 }
1332
1333 static void fake_member_assigns(struct symbol *sym, fake_cb *fake_cb)
1334 {
1335         fake_member_assigns_helper(symbol_expression(sym),
1336                                    sym->initializer->expr_list, fake_cb);
1337 }
1338
1339 static void fake_element_assigns_helper(struct expression *array, struct expression_list *expr_list, fake_cb *fake_cb)
1340 {
1341         struct expression *offset, *binop, *assign, *tmp;
1342         struct symbol *type;
1343         int idx;
1344
1345         if (ptr_list_size((struct ptr_list *)expr_list) > 1000)
1346                 return;
1347
1348         idx = 0;
1349         FOR_EACH_PTR(expr_list, tmp) {
1350                 if (tmp->type == EXPR_INDEX) {
1351                         if (tmp->idx_from != tmp->idx_to)
1352                                 return;
1353                         idx = tmp->idx_from;
1354                         if (!tmp->idx_expression)
1355                                 goto next;
1356                         tmp = tmp->idx_expression;
1357                 }
1358                 offset = value_expr(idx);
1359                 binop = array_element_expression(array, offset);
1360                 if (tmp->type == EXPR_INITIALIZER) {
1361                         type = get_type(binop);
1362                         if (type && type->type == SYM_ARRAY)
1363                                 fake_element_assigns_helper(binop, tmp->expr_list, fake_cb);
1364                         else
1365                                 fake_member_assigns_helper(binop, tmp->expr_list, fake_cb);
1366                 } else {
1367                         assign = assign_expression(binop, tmp);
1368                         fake_cb(assign);
1369                 }
1370 next:
1371                 idx++;
1372         } END_FOR_EACH_PTR(tmp);
1373 }
1374
1375 static void fake_element_assigns(struct symbol *sym, fake_cb *fake_cb)
1376 {
1377         fake_element_assigns_helper(symbol_expression(sym), sym->initializer->expr_list, fake_cb);
1378 }
1379
1380 static void fake_assign_expr(struct symbol *sym)
1381 {
1382         struct expression *assign, *symbol;
1383
1384         symbol = symbol_expression(sym);
1385         assign = assign_expression(symbol, sym->initializer);
1386         __split_expr(assign);
1387 }
1388
1389 static void call_split_expr(struct expression *expr)
1390 {
1391         __split_expr(expr);
1392 }
1393
1394 static void do_initializer_stuff(struct symbol *sym)
1395 {
1396         if (!sym->initializer)
1397                 return;
1398
1399         if (sym->initializer->type == EXPR_INITIALIZER) {
1400                 if (get_real_base_type(sym)->type == SYM_ARRAY)
1401                         fake_element_assigns(sym, call_split_expr);
1402                 else
1403                         fake_member_assigns(sym, call_split_expr);
1404         } else {
1405                 fake_assign_expr(sym);
1406         }
1407 }
1408
1409 static void split_declaration(struct symbol_list *sym_list)
1410 {
1411         struct symbol *sym;
1412
1413         FOR_EACH_PTR(sym_list, sym) {
1414                 __pass_to_client(sym, DECLARATION_HOOK);
1415                 do_initializer_stuff(sym);
1416                 split_sym(sym);
1417         } END_FOR_EACH_PTR(sym);
1418 }
1419
1420 static void call_global_assign_hooks(struct expression *assign)
1421 {
1422         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1423 }
1424
1425 static void fake_global_assign(struct symbol *sym)
1426 {
1427         struct expression *assign, *symbol;
1428
1429         if (get_real_base_type(sym)->type == SYM_ARRAY) {
1430                 if (sym->initializer && sym->initializer->type == EXPR_INITIALIZER) {
1431                         fake_element_assigns(sym, call_global_assign_hooks);
1432                 } else if (sym->initializer) {
1433                         symbol = symbol_expression(sym);
1434                         assign = assign_expression(symbol, sym->initializer);
1435                         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1436                 } else {
1437                         fake_element_assigns_helper(symbol_expression(sym), NULL, call_global_assign_hooks);
1438                 }
1439         } else if (get_real_base_type(sym)->type == SYM_STRUCT) {
1440                 if (sym->initializer && sym->initializer->type == EXPR_INITIALIZER) {
1441                         fake_member_assigns(sym, call_global_assign_hooks);
1442                 } else if (sym->initializer) {
1443                         symbol = symbol_expression(sym);
1444                         assign = assign_expression(symbol, sym->initializer);
1445                         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1446                 } else {
1447                         fake_member_assigns_helper(symbol_expression(sym), NULL, call_global_assign_hooks);
1448                 }
1449         } else {
1450                 symbol = symbol_expression(sym);
1451                 if (sym->initializer)
1452                         assign = assign_expression(symbol, sym->initializer);
1453                 else
1454                         assign = assign_expression(symbol, zero_expr());
1455                 __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1456         }
1457 }
1458
1459 static void start_function_definition(struct symbol *sym)
1460 {
1461         __in_function_def = 1;
1462         __pass_to_client(sym, FUNC_DEF_HOOK);
1463         __in_function_def = 0;
1464         __pass_to_client(sym, AFTER_DEF_HOOK);
1465
1466 }
1467
1468 static void split_function(struct symbol *sym)
1469 {
1470         struct symbol *base_type = get_base_type(sym);
1471
1472         if (!base_type->stmt && !base_type->inline_stmt)
1473                 return;
1474
1475         gettimeofday(&fn_start_time, NULL);
1476         cur_func_sym = sym;
1477         if (sym->ident)
1478                 cur_func = sym->ident->name;
1479         set_position(sym->pos);
1480         loop_count = 0;
1481         last_goto_statement_handled = 0;
1482         sm_debug("new function:  %s\n", cur_func);
1483         __stree_id = 0;
1484         if (option_two_passes) {
1485                 __unnullify_path();
1486                 loop_num = 0;
1487                 final_pass = 0;
1488                 start_function_definition(sym);
1489                 __split_stmt(base_type->stmt);
1490                 __split_stmt(base_type->inline_stmt);
1491                 nullify_path();
1492         }
1493         __unnullify_path();
1494         loop_num = 0;
1495         final_pass = 1;
1496         start_function_definition(sym);
1497         __split_stmt(base_type->stmt);
1498         __split_stmt(base_type->inline_stmt);
1499         __pass_to_client(sym, END_FUNC_HOOK);
1500         if (need_delayed_scope_hooks())
1501                 __call_scope_hooks();
1502         __pass_to_client(sym, AFTER_FUNC_HOOK);
1503
1504         clear_all_states();
1505         cur_func_sym = NULL;
1506         cur_func = NULL;
1507         free_data_info_allocs();
1508         free_expression_stack(&switch_expr_stack);
1509         __free_ptr_list((struct ptr_list **)&big_statement_stack);
1510         __bail_on_rest_of_function = 0;
1511 }
1512
1513 static void parse_inline(struct expression *call)
1514 {
1515         struct symbol *base_type;
1516         int loop_num_bak = loop_num;
1517         int loop_count_bak = loop_count;
1518         int final_pass_bak = final_pass;
1519         char *cur_func_bak = cur_func;
1520         struct statement_list *big_statement_stack_bak = big_statement_stack;
1521         struct expression_list *big_expression_stack_bak = big_expression_stack;
1522         struct expression_list *big_condition_stack_bak = big_condition_stack;
1523         struct expression_list *switch_expr_stack_bak = switch_expr_stack;
1524         struct symbol *cur_func_sym_bak = cur_func_sym;
1525
1526         __pass_to_client(call, INLINE_FN_START);
1527         final_pass = 0;  /* don't print anything */
1528         __inline_fn = call;
1529
1530         base_type = get_base_type(call->fn->symbol);
1531         cur_func_sym = call->fn->symbol;
1532         if (call->fn->symbol->ident)
1533                 cur_func = call->fn->symbol->ident->name;
1534         else
1535                 cur_func = NULL;
1536         set_position(call->fn->symbol->pos);
1537
1538         save_all_states();
1539         big_statement_stack = NULL;
1540         big_expression_stack = NULL;
1541         big_condition_stack = NULL;
1542         switch_expr_stack = NULL;
1543
1544         sm_debug("inline function:  %s\n", cur_func);
1545         __unnullify_path();
1546         loop_num = 0;
1547         start_function_definition(call->fn->symbol);
1548         __split_stmt(base_type->stmt);
1549         __split_stmt(base_type->inline_stmt);
1550         __pass_to_client(call->fn->symbol, END_FUNC_HOOK);
1551         __pass_to_client(call->fn->symbol, AFTER_FUNC_HOOK);
1552
1553         free_expression_stack(&switch_expr_stack);
1554         __free_ptr_list((struct ptr_list **)&big_statement_stack);
1555         nullify_path();
1556         free_goto_stack();
1557
1558         loop_num = loop_num_bak;
1559         loop_count = loop_count_bak;
1560         final_pass = final_pass_bak;
1561         cur_func_sym = cur_func_sym_bak;
1562         cur_func = cur_func_bak;
1563         big_statement_stack = big_statement_stack_bak;
1564         big_expression_stack = big_expression_stack_bak;
1565         big_condition_stack = big_condition_stack_bak;
1566         switch_expr_stack = switch_expr_stack_bak;
1567
1568         restore_all_states();
1569         set_position(call->pos);
1570         __inline_fn = NULL;
1571         __pass_to_client(call, INLINE_FN_END);
1572 }
1573
1574 static struct symbol_list *inlines_called;
1575 static void add_inline_function(struct symbol *sym)
1576 {
1577         static struct symbol_list *already_added;
1578         struct symbol *tmp;
1579
1580         FOR_EACH_PTR(already_added, tmp) {
1581                 if (tmp == sym)
1582                         return;
1583         } END_FOR_EACH_PTR(tmp);
1584
1585         add_ptr_list(&already_added, sym);
1586         add_ptr_list(&inlines_called, sym);
1587 }
1588
1589 static void process_inlines(void)
1590 {
1591         struct symbol *tmp;
1592
1593         FOR_EACH_PTR(inlines_called, tmp) {
1594                 split_function(tmp);
1595         } END_FOR_EACH_PTR(tmp);
1596         free_ptr_list(&inlines_called);
1597 }
1598
1599 static struct symbol *get_last_scoped_symbol(struct symbol_list *big_list, int use_static)
1600 {
1601         struct symbol *sym;
1602
1603         FOR_EACH_PTR_REVERSE(big_list, sym) {
1604                 if (!sym->scope)
1605                         continue;
1606                 if (use_static && sym->ctype.modifiers & MOD_STATIC)
1607                         return sym;
1608                 if (!use_static && !(sym->ctype.modifiers & MOD_STATIC))
1609                         return sym;
1610         } END_FOR_EACH_PTR_REVERSE(sym);
1611
1612         return NULL;
1613 }
1614
1615 static void split_inlines_in_scope(struct symbol *sym)
1616 {
1617         struct symbol *base;
1618         struct symbol_list *scope_list;
1619         int stream;
1620
1621         scope_list = sym->scope->symbols;
1622         stream = sym->pos.stream;
1623
1624         /* find the last static symbol in the file */
1625         FOR_EACH_PTR_REVERSE(scope_list, sym) {
1626                 if (sym->pos.stream != stream)
1627                         continue;
1628                 if (sym->type != SYM_NODE)
1629                         continue;
1630                 base = get_base_type(sym);
1631                 if (!base)
1632                         continue;
1633                 if (base->type != SYM_FN)
1634                         continue;
1635                 if (!base->inline_stmt)
1636                         continue;
1637                 add_inline_function(sym);
1638         } END_FOR_EACH_PTR_REVERSE(sym);
1639
1640         process_inlines();
1641 }
1642
1643 static void split_inlines(struct symbol_list *sym_list)
1644 {
1645         struct symbol *sym;
1646
1647         sym = get_last_scoped_symbol(sym_list, 0);
1648         if (sym)
1649                 split_inlines_in_scope(sym);
1650         sym = get_last_scoped_symbol(sym_list, 1);
1651         if (sym)
1652                 split_inlines_in_scope(sym);
1653 }
1654
1655 static struct stree *clone_estates_perm(struct stree *orig)
1656 {
1657         struct stree *ret = NULL;
1658         struct sm_state *tmp;
1659
1660         FOR_EACH_SM(orig, tmp) {
1661                 set_state_stree_perm(&ret, tmp->owner, tmp->name, tmp->sym, clone_estate_perm(tmp->state));
1662         } END_FOR_EACH_SM(tmp);
1663
1664         return ret;
1665 }
1666
1667 struct position last_pos;
1668 static void split_functions(struct symbol_list *sym_list)
1669 {
1670         struct symbol *sym;
1671
1672         __unnullify_path();
1673         FOR_EACH_PTR(sym_list, sym) {
1674                 set_position(sym->pos);
1675                 if (sym->type != SYM_NODE || get_base_type(sym)->type != SYM_FN) {
1676                         __pass_to_client(sym, BASE_HOOK);
1677                         fake_global_assign(sym);
1678                 }
1679         } END_FOR_EACH_PTR(sym);
1680         global_states = clone_estates_perm(get_all_states_stree(SMATCH_EXTRA));
1681         nullify_path();
1682
1683         FOR_EACH_PTR(sym_list, sym) {
1684                 set_position(sym->pos);
1685                 if (sym->type == SYM_NODE && get_base_type(sym)->type == SYM_FN) {
1686                         split_function(sym);
1687                         process_inlines();
1688                 }
1689                 last_pos = sym->pos;
1690         } END_FOR_EACH_PTR(sym);
1691         split_inlines(sym_list);
1692         __pass_to_client(sym_list, END_FILE_HOOK);
1693 }
1694
1695 static int final_before_fake;
1696 void init_fake_env(void)
1697 {
1698         if (!in_fake_env)
1699                 final_before_fake = final_pass;
1700         in_fake_env++;
1701         __push_fake_cur_stree();
1702         final_pass = 0;
1703 }
1704
1705 void end_fake_env(void)
1706 {
1707         __pop_fake_cur_stree();
1708         in_fake_env--;
1709         if (!in_fake_env)
1710                 final_pass = final_before_fake;
1711 }
1712
1713 void smatch(int argc, char **argv)
1714 {
1715         struct string_list *filelist = NULL;
1716         struct symbol_list *sym_list;
1717         struct timeval stop, start;
1718
1719         gettimeofday(&start, NULL);
1720
1721         if (argc < 2) {
1722                 printf("Usage:  smatch [--debug] <filename.c>\n");
1723                 exit(1);
1724         }
1725         sparse_initialize(argc, argv, &filelist);
1726         set_valid_ptr_max();
1727         FOR_EACH_PTR_NOTAG(filelist, base_file) {
1728                 if (option_file_output) {
1729                         char buf[256];
1730
1731                         snprintf(buf, sizeof(buf), "%s.smatch", base_file);
1732                         sm_outfd = fopen(buf, "w");
1733                         if (!sm_outfd) {
1734                                 printf("Error:  Cannot open %s\n", base_file);
1735                                 exit(1);
1736                         }
1737                 }
1738                 sym_list = sparse_keep_tokens(base_file);
1739                 split_functions(sym_list);
1740         } END_FOR_EACH_PTR_NOTAG(base_file);
1741
1742         gettimeofday(&stop, NULL);
1743
1744         set_position(last_pos);
1745         if (option_time)
1746                 sm_msg("time: %lu", stop.tv_sec - start.tv_sec);
1747 }