smatch_flow.c

   1 /*
   2  * Copyright (C) 2006,2008 Dan Carpenter.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
  16  */
  17
  18 #define _GNU_SOURCE 1
  19 #include <unistd.h>
  20 #include <stdio.h>
  21 #include "token.h"
  22 #include "scope.h"
  23 #include "smatch.h"
  24 #include "smatch_expression_stacks.h"
  25 #include "smatch_extra.h"
  26 #include "smatch_slist.h"
  27
  28 int __in_fake_assign;
  29 int final_pass;
  30 int __inline_call;
  31 struct expression  *__inline_fn;
  32
  33 static int __smatch_lineno = 0;
  34
  35 static char *base_file;
  36 static const char *filename;
  37 static char *pathname;
  38 static char *full_filename;
  39 static char *cur_func;
  40 static unsigned int loop_count;
  41 static int last_goto_statement_handled;
  42 int __expr_stmt_count;
  43 int __in_function_def;
  44 static struct expression_list *switch_expr_stack = NULL;
  45 static struct expression_list *post_op_stack = NULL;
  46
  47 struct expression_list *big_expression_stack;
  48 struct statement_list *big_statement_stack;
  49 struct statement *__prev_stmt;
  50 struct statement *__cur_stmt;
  51 struct statement *__next_stmt;
  52 int __in_pre_condition = 0;
  53 int __bail_on_rest_of_function = 0;
  54 static struct timeval fn_start_time;
  55 char *get_function(void) { return cur_func; }
  56 int get_lineno(void) { return __smatch_lineno; }
  57 int inside_loop(void) { return !!loop_count; }
  58 int definitely_inside_loop(void) { return !!(loop_count & ~0x80000000); }
  59 struct expression *get_switch_expr(void) { return top_expression(switch_expr_stack); }
  60 int in_expression_statement(void) { return !!__expr_stmt_count; }
  61
  62 static void split_symlist(struct symbol_list *sym_list);
  63 static void split_declaration(struct symbol_list *sym_list);
  64 static void split_expr_list(struct expression_list *expr_list, struct expression *parent);
  65 static void add_inline_function(struct symbol *sym);
  66 static void parse_inline(struct expression *expr);
  67
  68 int option_assume_loops = 0;
  69 int option_two_passes = 0;
  70 struct symbol *cur_func_sym = NULL;
  71 struct stree *global_states;
  72
  73 long long valid_ptr_min = 4096;
  74 long long valid_ptr_max = 2117777777;
  75 sval_t valid_ptr_min_sval = {
  76         .type = &ptr_ctype,
  77         {.value = 4096},
  78 };
  79 sval_t valid_ptr_max_sval = {
  80         .type = &ptr_ctype,
  81         {.value = LONG_MAX - 100000},
  82 };
  83
  84 static void set_valid_ptr_max(void)
  85 {
  86         if (type_bits(&ptr_ctype) == 32)
  87                 valid_ptr_max = 2117777777;
  88         else if (type_bits(&ptr_ctype) == 64)
  89                 valid_ptr_max = 2117777777777777777LL;
  90
  91         valid_ptr_max_sval.value = valid_ptr_max;
  92 }
  93
  94 int outside_of_function(void)
  95 {
  96         return cur_func_sym == NULL;
  97 }
  98
  99 const char *get_filename(void)
 100 {
 101         if (option_info)
 102                 return base_file;
 103         if (option_full_path)
 104                 return full_filename;
 105         return filename;
 106 }
 107
 108 const char *get_base_file(void)
 109 {
 110         return base_file;
 111 }
 112
 113 static void set_position(struct position pos)
 114 {
 115         int len;
 116         static int prev_stream = -1;
 117
 118         if (pos.stream == 0 && pos.line == 0)
 119                 return;
 120
 121         __smatch_lineno = pos.line;
 122
 123         if (pos.stream == prev_stream)
 124                 return;
 125
 126         filename = stream_name(pos.stream);
 127
 128         free(full_filename);
 129         pathname = getcwd(NULL, 0);
 130         if (pathname) {
 131                 len = strlen(pathname) + 1 + strlen(filename) + 1;
 132                 full_filename = malloc(len);
 133                 snprintf(full_filename, len, "%s/%s", pathname, filename);
 134         } else {
 135                 full_filename = alloc_string(filename);
 136         }
 137         free(pathname);
 138 }
 139
 140 void set_parent_expr(struct expression *expr, struct expression *parent)
 141 {
 142         if (!expr)
 143                 return;
 144         expr->parent = parent;
 145 }
 146
 147 static void set_parent_stmt(struct statement *stmt, struct statement *parent)
 148 {
 149         if (!stmt)
 150                 return;
 151         stmt->parent = parent;
 152 }
 153
 154 int is_assigned_call(struct expression *expr)
 155 {
 156         struct expression *tmp;
 157
 158         FOR_EACH_PTR_REVERSE(big_expression_stack, tmp) {
 159                 if (tmp->type == EXPR_ASSIGNMENT && tmp->op == '=' &&
 160                     strip_expr(tmp->right) == expr)
 161                         return 1;
 162                 if (tmp->pos.line < expr->pos.line)
 163                         return 0;
 164         } END_FOR_EACH_PTR_REVERSE(tmp);
 165         return 0;
 166 }
 167
 168 static int is_inline_func(struct expression *expr)
 169 {
 170         if (expr->type != EXPR_SYMBOL || !expr->symbol)
 171                 return 0;
 172         if (expr->symbol->ctype.modifiers & MOD_INLINE)
 173                 return 1;
 174         return 0;
 175 }
 176
 177 static int is_noreturn_func(struct expression *expr)
 178 {
 179         if (expr->type != EXPR_SYMBOL || !expr->symbol)
 180                 return 0;
 181         if (expr->symbol->ctype.modifiers & MOD_NORETURN)
 182                 return 1;
 183         return 0;
 184 }
 185
 186 int inlinable(struct expression *expr)
 187 {
 188         struct symbol *sym;
 189         struct statement *last_stmt = NULL;
 190
 191         if (__inline_fn)  /* don't nest */
 192                 return 0;
 193
 194         if (expr->type != EXPR_SYMBOL || !expr->symbol)
 195                 return 0;
 196         if (is_no_inline_function(expr->symbol->ident->name))
 197                 return 0;
 198         sym = get_base_type(expr->symbol);
 199         if (sym->stmt && sym->stmt->type == STMT_COMPOUND) {
 200                 if (ptr_list_size((struct ptr_list *)sym->stmt->stmts) > 10)
 201                         return 0;
 202                 if (sym->stmt->type != STMT_COMPOUND)
 203                         return 0;
 204                 last_stmt = last_ptr_list((struct ptr_list *)sym->stmt->stmts);
 205         }
 206         if (sym->inline_stmt && sym->inline_stmt->type == STMT_COMPOUND) {
 207                 if (ptr_list_size((struct ptr_list *)sym->inline_stmt->stmts) > 10)
 208                         return 0;
 209                 if (sym->inline_stmt->type != STMT_COMPOUND)
 210                         return 0;
 211                 last_stmt = last_ptr_list((struct ptr_list *)sym->inline_stmt->stmts);
 212         }
 213
 214         if (!last_stmt)
 215                 return 0;
 216
 217         /* the magic numbers in this function are pulled out of my bum. */
 218         if (last_stmt->pos.line > sym->pos.line + 20)
 219                 return 0;
 220
 221         return 1;
 222 }
 223
 224 void __process_post_op_stack(void)
 225 {
 226         struct expression *expr;
 227
 228         FOR_EACH_PTR(post_op_stack, expr) {
 229                 __pass_to_client(expr, OP_HOOK);
 230         } END_FOR_EACH_PTR(expr);
 231
 232         __free_ptr_list((struct ptr_list **)&post_op_stack);
 233 }
 234
 235 static int handle_comma_assigns(struct expression *expr)
 236 {
 237         struct expression *right;
 238         struct expression *assign;
 239
 240         right = strip_expr(expr->right);
 241         if (right->type != EXPR_COMMA)
 242                 return 0;
 243
 244         __split_expr(right->left);
 245         __process_post_op_stack();
 246
 247         assign = assign_expression(expr->left, right->right);
 248         __split_expr(assign);
 249
 250         return 1;
 251 }
 252
 253 /* This is to handle *p++ = foo; assignments */
 254 static int handle_postop_assigns(struct expression *expr)
 255 {
 256         struct expression *left, *fake_left;
 257         struct expression *assign;
 258
 259         left = strip_expr(expr->left);
 260         if (left->type != EXPR_PREOP || left->op != '*')
 261                 return 0;
 262         left = strip_expr(left->unop);
 263         if (left->type != EXPR_POSTOP)
 264                 return 0;
 265
 266         fake_left = deref_expression(strip_expr(left->unop));
 267         assign = assign_expression(fake_left, expr->right);
 268
 269         __split_expr(assign);
 270         __split_expr(expr->left);
 271
 272         return 1;
 273 }
 274
 275 static int prev_expression_is_getting_address(struct expression *expr)
 276 {
 277         struct expression *parent;
 278
 279         do {
 280                 parent = expr->parent;
 281
 282                 if (!parent)
 283                         return 0;
 284                 if (parent->type == EXPR_PREOP && parent->op == '&')
 285                         return 1;
 286                 if (parent->type == EXPR_PREOP && parent->op == '(')
 287                         goto next;
 288                 if (parent->type == EXPR_DEREF && parent->op == '.')
 289                         goto next;
 290
 291                 return 0;
 292 next:
 293                 expr = parent;
 294         } while (1);
 295 }
 296
 297 void __split_expr(struct expression *expr)
 298 {
 299         if (!expr)
 300                 return;
 301
 302         // sm_msg(" Debug expr_type %d %s", expr->type, show_special(expr->op));
 303
 304         if (__in_fake_assign && expr->type != EXPR_ASSIGNMENT)
 305                 return;
 306         if (__in_fake_assign >= 4)  /* don't allow too much nesting */
 307                 return;
 308
 309         push_expression(&big_expression_stack, expr);
 310         set_position(expr->pos);
 311         __pass_to_client(expr, EXPR_HOOK);
 312
 313         switch (expr->type) {
 314         case EXPR_PREOP:
 315                 set_parent_expr(expr->unop, expr);
 316
 317                 if (expr->op == '*' &&
 318                     !prev_expression_is_getting_address(expr))
 319                         __pass_to_client(expr, DEREF_HOOK);
 320                 __split_expr(expr->unop);
 321                 __pass_to_client(expr, OP_HOOK);
 322                 break;
 323         case EXPR_POSTOP:
 324                 set_parent_expr(expr->unop, expr);
 325
 326                 __split_expr(expr->unop);
 327                 push_expression(&post_op_stack, expr);
 328                 break;
 329         case EXPR_STATEMENT:
 330                 __expr_stmt_count++;
 331                 if (expr->statement && !expr->statement->parent) {
 332                         set_parent_stmt(expr->statement,
 333                                         last_ptr_list((struct ptr_list *)big_statement_stack));
 334                 }
 335                 __split_stmt(expr->statement);
 336                 __expr_stmt_count--;
 337                 break;
 338         case EXPR_LOGICAL:
 339         case EXPR_COMPARE:
 340                 set_parent_expr(expr->left, expr);
 341                 set_parent_expr(expr->right, expr);
 342
 343                 __pass_to_client(expr, LOGIC_HOOK);
 344                 __handle_logic(expr);
 345                 break;
 346         case EXPR_BINOP:
 347                 set_parent_expr(expr->left, expr);
 348                 set_parent_expr(expr->right, expr);
 349
 350                 __pass_to_client(expr, BINOP_HOOK);
 351         case EXPR_COMMA:
 352                 set_parent_expr(expr->left, expr);
 353                 set_parent_expr(expr->right, expr);
 354
 355                 __split_expr(expr->left);
 356                 __process_post_op_stack();
 357                 __split_expr(expr->right);
 358                 break;
 359         case EXPR_ASSIGNMENT: {
 360                 struct expression *tmp;
 361
 362                 set_parent_expr(expr->left, expr);
 363                 set_parent_expr(expr->right, expr);
 364
 365                 if (!expr->right)
 366                         break;
 367
 368                 __pass_to_client(expr, RAW_ASSIGNMENT_HOOK);
 369
 370                 /* foo = !bar() */
 371                 if (__handle_condition_assigns(expr))
 372                         break;
 373                 /* foo = (x < 5 ? foo : 5); */
 374                 if (__handle_select_assigns(expr))
 375                         break;
 376                 /* foo = ({frob(); frob(); frob(); 1;}) */
 377                 if (__handle_expr_statement_assigns(expr))
 378                         break;
 379                 /* foo = (3, 4); */
 380                 if (handle_comma_assigns(expr))
 381                         break;
 382                 if (handle_postop_assigns(expr))
 383                         break;
 384
 385                 __split_expr(expr->right);
 386                 if (outside_of_function())
 387                         __pass_to_client(expr, GLOBAL_ASSIGNMENT_HOOK);
 388                 else
 389                         __pass_to_client(expr, ASSIGNMENT_HOOK);
 390
 391                 __fake_struct_member_assignments(expr);
 392
 393                 tmp = strip_expr(expr->right);
 394                 if (expr->op == '=' && tmp->type == EXPR_CALL) {
 395                         __pass_to_client(expr, CALL_ASSIGNMENT_HOOK);
 396                 }
 397                 if (get_macro_name(tmp->pos) &&
 398                     get_macro_name(expr->pos) != get_macro_name(tmp->pos))
 399                         __pass_to_client(expr, MACRO_ASSIGNMENT_HOOK);
 400                 __split_expr(expr->left);
 401                 break;
 402         }
 403         case EXPR_DEREF:
 404                 set_parent_expr(expr->deref, expr);
 405
 406                 __pass_to_client(expr, DEREF_HOOK);
 407                 __split_expr(expr->deref);
 408                 break;
 409         case EXPR_SLICE:
 410                 set_parent_expr(expr->base, expr);
 411
 412                 __split_expr(expr->base);
 413                 break;
 414         case EXPR_CAST:
 415         case EXPR_FORCE_CAST:
 416                 set_parent_expr(expr->cast_expression, expr);
 417
 418                 __pass_to_client(expr, CAST_HOOK);
 419                 __split_expr(expr->cast_expression);
 420                 break;
 421         case EXPR_SIZEOF:
 422                 if (expr->cast_expression)
 423                         __pass_to_client(strip_parens(expr->cast_expression),
 424                                          SIZEOF_HOOK);
 425                 break;
 426         case EXPR_OFFSETOF:
 427         case EXPR_ALIGNOF:
 428                 evaluate_expression(expr);
 429                 break;
 430         case EXPR_CONDITIONAL:
 431         case EXPR_SELECT:
 432                 set_parent_expr(expr->conditional, expr);
 433                 set_parent_expr(expr->cond_true, expr);
 434                 set_parent_expr(expr->cond_false, expr);
 435
 436                 if (known_condition_true(expr->conditional)) {
 437                         __split_expr(expr->cond_true);
 438                         break;
 439                 }
 440                 if (known_condition_false(expr->conditional)) {
 441                         __split_expr(expr->cond_false);
 442                         break;
 443                 }
 444                 __pass_to_client(expr, SELECT_HOOK);
 445                 __split_whole_condition(expr->conditional);
 446                 __split_expr(expr->cond_true);
 447                 __push_true_states();
 448                 __use_false_states();
 449                 __split_expr(expr->cond_false);
 450                 __merge_true_states();
 451                 break;
 452         case EXPR_CALL:
 453                 set_parent_expr(expr->fn, expr);
 454
 455                 if (sym_name_is("__builtin_constant_p", expr->fn))
 456                         break;
 457                 split_expr_list(expr->args, expr);
 458                 __split_expr(expr->fn);
 459                 if (is_inline_func(expr->fn))
 460                         add_inline_function(expr->fn->symbol);
 461                 if (inlinable(expr->fn))
 462                         __inline_call = 1;
 463                 __process_post_op_stack();
 464                 __pass_to_client(expr, FUNCTION_CALL_HOOK);
 465                 __inline_call = 0;
 466                 if (inlinable(expr->fn)) {
 467                         parse_inline(expr);
 468                 }
 469                 __pass_to_client(expr, CALL_HOOK_AFTER_INLINE);
 470                 if (is_noreturn_func(expr->fn))
 471                         nullify_path();
 472                 break;
 473         case EXPR_INITIALIZER:
 474                 split_expr_list(expr->expr_list, expr);
 475                 break;
 476         case EXPR_IDENTIFIER:
 477                 set_parent_expr(expr->ident_expression, expr);
 478                 __split_expr(expr->ident_expression);
 479                 break;
 480         case EXPR_INDEX:
 481                 set_parent_expr(expr->idx_expression, expr);
 482                 __split_expr(expr->idx_expression);
 483                 break;
 484         case EXPR_POS:
 485                 set_parent_expr(expr->init_expr, expr);
 486                 __split_expr(expr->init_expr);
 487                 break;
 488         case EXPR_SYMBOL:
 489                 __pass_to_client(expr, SYM_HOOK);
 490                 break;
 491         case EXPR_STRING:
 492                 __pass_to_client(expr, STRING_HOOK);
 493                 break;
 494         default:
 495                 break;
 496         };
 497         pop_expression(&big_expression_stack);
 498 }
 499
 500 static int is_forever_loop(struct statement *stmt)
 501 {
 502         struct expression *expr;
 503         sval_t sval;
 504
 505         expr = strip_expr(stmt->iterator_pre_condition);
 506         if (!expr)
 507                 expr = stmt->iterator_post_condition;
 508         if (!expr) {
 509                 /* this is a for(;;) loop... */
 510                 return 1;
 511         }
 512
 513         if (get_value(expr, &sval) && sval.value != 0)
 514                 return 1;
 515
 516         return 0;
 517 }
 518
 519 static int loop_num;
 520 static char *get_loop_name(int num)
 521 {
 522         char buf[256];
 523
 524         snprintf(buf, 255, "-loop%d", num);
 525         buf[255] = '\0';
 526         return alloc_sname(buf);
 527 }
 528
 529 /*
 530  * Pre Loops are while and for loops.
 531  */
 532 static void handle_pre_loop(struct statement *stmt)
 533 {
 534         int once_through; /* we go through the loop at least once */
 535         struct sm_state *extra_sm = NULL;
 536         int unchanged = 0;
 537         char *loop_name;
 538         struct stree *stree = NULL;
 539         struct sm_state *sm = NULL;
 540
 541         loop_name = get_loop_name(loop_num);
 542         loop_num++;
 543
 544         __split_stmt(stmt->iterator_pre_statement);
 545         __prev_stmt = stmt->iterator_pre_statement;
 546
 547         once_through = implied_condition_true(stmt->iterator_pre_condition);
 548
 549         loop_count++;
 550         __push_continues();
 551         __push_breaks();
 552
 553         __merge_gotos(loop_name);
 554
 555         extra_sm = __extra_handle_canonical_loops(stmt, &stree);
 556         __in_pre_condition++;
 557         __pass_to_client(stmt, PRELOOP_HOOK);
 558         __split_whole_condition(stmt->iterator_pre_condition);
 559         __in_pre_condition--;
 560         FOR_EACH_SM(stree, sm) {
 561                 set_state(sm->owner, sm->name, sm->sym, sm->state);
 562         } END_FOR_EACH_SM(sm);
 563         free_stree(&stree);
 564         if (extra_sm)
 565                 extra_sm = get_sm_state(extra_sm->owner, extra_sm->name, extra_sm->sym);
 566
 567         if (option_assume_loops)
 568                 once_through = 1;
 569
 570         __split_stmt(stmt->iterator_statement);
 571         if (is_forever_loop(stmt)) {
 572                 __merge_continues();
 573                 __save_gotos(loop_name);
 574
 575                 __push_fake_cur_stree();
 576                 __split_stmt(stmt->iterator_post_statement);
 577                 stree = __pop_fake_cur_stree();
 578
 579                 __discard_false_states();
 580                 __use_breaks();
 581
 582                 if (!__path_is_null())
 583                         __merge_stree_into_cur(stree);
 584                 free_stree(&stree);
 585         } else {
 586                 __merge_continues();
 587                 unchanged = __iterator_unchanged(extra_sm);
 588                 __split_stmt(stmt->iterator_post_statement);
 589                 __prev_stmt = stmt->iterator_post_statement;
 590                 __cur_stmt = stmt;
 591
 592                 __save_gotos(loop_name);
 593                 __in_pre_condition++;
 594                 __split_whole_condition(stmt->iterator_pre_condition);
 595                 __in_pre_condition--;
 596                 nullify_path();
 597                 __merge_false_states();
 598                 if (once_through)
 599                         __discard_false_states();
 600                 else
 601                         __merge_false_states();
 602
 603                 if (extra_sm && unchanged)
 604                         __extra_pre_loop_hook_after(extra_sm,
 605                                                 stmt->iterator_post_statement,
 606                                                 stmt->iterator_pre_condition);
 607                 __merge_breaks();
 608         }
 609         loop_count--;
 610 }
 611
 612 /*
 613  * Post loops are do {} while();
 614  */
 615 static void handle_post_loop(struct statement *stmt)
 616 {
 617         char *loop_name;
 618
 619         loop_name = get_loop_name(loop_num);
 620         loop_num++;
 621         loop_count++;
 622
 623         __push_continues();
 624         __push_breaks();
 625         __merge_gotos(loop_name);
 626         __split_stmt(stmt->iterator_statement);
 627         __merge_continues();
 628         if (!is_zero(stmt->iterator_post_condition))
 629                 __save_gotos(loop_name);
 630
 631         if (is_forever_loop(stmt)) {
 632                 __use_breaks();
 633         } else {
 634                 __split_whole_condition(stmt->iterator_post_condition);
 635                 __use_false_states();
 636                 __merge_breaks();
 637         }
 638         loop_count--;
 639 }
 640
 641 static int empty_statement(struct statement *stmt)
 642 {
 643         if (!stmt)
 644                 return 0;
 645         if (stmt->type == STMT_EXPRESSION && !stmt->expression)
 646                 return 1;
 647         return 0;
 648 }
 649
 650 static int last_stmt_on_same_line(void)
 651 {
 652         struct statement *stmt;
 653         int i = 0;
 654
 655         FOR_EACH_PTR_REVERSE(big_statement_stack, stmt) {
 656                 if (!i++)
 657                         continue;
 658                 if  (stmt->pos.line == get_lineno())
 659                         return 1;
 660                 return 0;
 661         } END_FOR_EACH_PTR_REVERSE(stmt);
 662         return 0;
 663 }
 664
 665 static void split_asm_constraints(struct expression_list *expr_list)
 666 {
 667         struct expression *expr;
 668         int state = 0;
 669
 670         FOR_EACH_PTR(expr_list, expr) {
 671                 switch (state) {
 672                 case 0: /* identifier */
 673                 case 1: /* constraint */
 674                         state++;
 675                         continue;
 676                 case 2: /* expression */
 677                         state = 0;
 678                         __split_expr(expr);
 679                         continue;
 680                 }
 681         } END_FOR_EACH_PTR(expr);
 682 }
 683
 684 static int is_case_val(struct statement *stmt, sval_t sval)
 685 {
 686         sval_t case_sval;
 687
 688         if (stmt->type != STMT_CASE)
 689                 return 0;
 690         if (!stmt->case_expression) {
 691                 __set_default();
 692                 return 1;
 693         }
 694         if (!get_value(stmt->case_expression, &case_sval))
 695                 return 0;
 696         if (case_sval.value == sval.value)
 697                 return 1;
 698         return 0;
 699 }
 700
 701 static struct range_list *get_case_rl(struct expression *switch_expr,
 702                                       struct expression *case_expr,
 703                                       struct expression *case_to)
 704 {
 705         sval_t start, end;
 706         struct range_list *rl = NULL;
 707         struct symbol *switch_type;
 708
 709         switch_type = get_type(switch_expr);
 710         if (get_value(case_to, &end) && get_value(case_expr, &start)) {
 711                 start = sval_cast(switch_type, start);
 712                 end = sval_cast(switch_type, end);
 713                 add_range(&rl, start, end);
 714         } else if (get_value(case_expr, &start)) {
 715                 start = sval_cast(switch_type, start);
 716                 add_range(&rl, start, start);
 717         }
 718
 719         return rl;
 720 }
 721
 722 static void split_known_switch(struct statement *stmt, sval_t sval)
 723 {
 724         struct statement *tmp;
 725         struct range_list *rl;
 726
 727         __split_expr(stmt->switch_expression);
 728         sval = sval_cast(get_type(stmt->switch_expression), sval);
 729
 730         push_expression(&switch_expr_stack, stmt->switch_expression);
 731         __save_switch_states(top_expression(switch_expr_stack));
 732         nullify_path();
 733         __push_default();
 734         __push_breaks();
 735
 736         stmt = stmt->switch_statement;
 737
 738         __push_scope_hooks();
 739         FOR_EACH_PTR(stmt->stmts, tmp) {
 740                 __smatch_lineno = tmp->pos.line;
 741                 if (is_case_val(tmp, sval)) {
 742                         rl = alloc_rl(sval, sval);
 743                         __merge_switches(top_expression(switch_expr_stack), rl);
 744                         __pass_case_to_client(top_expression(switch_expr_stack), rl);
 745                 }
 746                 if (__path_is_null())
 747                         continue;
 748                 __split_stmt(tmp);
 749                 if (__path_is_null()) {
 750                         __set_default();
 751                         goto out;
 752                 }
 753         } END_FOR_EACH_PTR(tmp);
 754 out:
 755         __call_scope_hooks();
 756         if (!__pop_default())
 757                 __merge_switches(top_expression(switch_expr_stack), NULL);
 758         __discard_switches();
 759         __merge_breaks();
 760         pop_expression(&switch_expr_stack);
 761 }
 762
 763 static void split_case(struct statement *stmt)
 764 {
 765         struct range_list *rl = NULL;
 766
 767         rl = get_case_rl(top_expression(switch_expr_stack),
 768                          stmt->case_expression, stmt->case_to);
 769         while (stmt->case_statement->type == STMT_CASE) {
 770                 struct range_list *tmp;
 771
 772                 tmp = get_case_rl(top_expression(switch_expr_stack),
 773                                   stmt->case_statement->case_expression,
 774                                   stmt->case_statement->case_to);
 775                 if (!tmp)
 776                         break;
 777                 rl = rl_union(rl, tmp);
 778                 if (!stmt->case_expression)
 779                         __set_default();
 780                 stmt = stmt->case_statement;
 781         }
 782
 783         __merge_switches(top_expression(switch_expr_stack), rl);
 784
 785         if (!stmt->case_expression)
 786                 __set_default();
 787         __split_stmt(stmt->case_statement);
 788 }
 789
 790 static int taking_too_long(void)
 791 {
 792         int ms;
 793
 794         ms = ms_since(&fn_start_time);
 795         if (ms > 1000 * 60 * 5)  /* five minutes */
 796                 return 1;
 797         return 0;
 798 }
 799
 800 static int is_last_stmt(struct statement *cur_stmt)
 801 {
 802         struct symbol *fn = get_base_type(cur_func_sym);
 803         struct statement *stmt;
 804
 805         if (!fn)
 806                 return 0;
 807         stmt = fn->stmt;
 808         if (!stmt)
 809                 stmt = fn->inline_stmt;
 810         if (!stmt || stmt->type != STMT_COMPOUND)
 811                 return 0;
 812         stmt = last_ptr_list((struct ptr_list *)stmt->stmts);
 813         if (stmt && stmt->type == STMT_LABEL)
 814                 stmt = stmt->label_statement;
 815         if (stmt == cur_stmt)
 816                 return 1;
 817         return 0;
 818 }
 819
 820 static void handle_backward_goto(struct statement *goto_stmt)
 821 {
 822         const char *goto_name, *label_name;
 823         struct statement *func_stmt;
 824         struct symbol *base_type = get_base_type(cur_func_sym);
 825         struct statement *tmp;
 826         int found = 0;
 827
 828         if (!option_info)
 829                 return;
 830         if (last_goto_statement_handled)
 831                 return;
 832         last_goto_statement_handled = 1;
 833
 834         if (!goto_stmt->goto_label ||
 835             goto_stmt->goto_label->type != SYM_LABEL ||
 836             !goto_stmt->goto_label->ident)
 837                 return;
 838         goto_name = goto_stmt->goto_label->ident->name;
 839
 840         func_stmt = base_type->stmt;
 841         if (!func_stmt)
 842                 func_stmt = base_type->inline_stmt;
 843         if (!func_stmt)
 844                 return;
 845         if (func_stmt->type != STMT_COMPOUND)
 846                 return;
 847
 848         FOR_EACH_PTR(func_stmt->stmts, tmp) {
 849                 if (!found) {
 850                         if (tmp->type != STMT_LABEL)
 851                                 continue;
 852                         if (!tmp->label_identifier ||
 853                             tmp->label_identifier->type != SYM_LABEL ||
 854                             !tmp->label_identifier->ident)
 855                                 continue;
 856                         label_name = tmp->label_identifier->ident->name;
 857                         if (strcmp(goto_name, label_name) != 0)
 858                                 continue;
 859                         found = 1;
 860                 }
 861                 __split_stmt(tmp);
 862         } END_FOR_EACH_PTR(tmp);
 863 }
 864
 865 static void fake_a_return(void)
 866 {
 867         struct symbol *return_type;
 868
 869         nullify_path();
 870         __unnullify_path();
 871
 872         return_type = get_real_base_type(cur_func_sym);
 873         return_type = get_real_base_type(return_type);
 874         if (return_type != &void_ctype) {
 875                 __pass_to_client(unknown_value_expression(NULL), RETURN_HOOK);
 876                 nullify_path();
 877         }
 878 }
 879
 880 static void fake_an_empty_default(struct position pos)
 881 {
 882         static struct statement none = {};
 883
 884         none.pos = pos;
 885         none.type = STMT_NONE;
 886         __merge_switches(top_expression(switch_expr_stack), NULL);
 887         __split_stmt(&none);
 888 }
 889
 890 static void split_compound(struct statement *stmt)
 891 {
 892         struct statement *prev = NULL;
 893         struct statement *cur = NULL;
 894         struct statement *next;
 895
 896         __push_scope_hooks();
 897
 898         FOR_EACH_PTR(stmt->stmts, next) {
 899                 /* just set them all ahead of time */
 900                 set_parent_stmt(next, stmt);
 901
 902                 if (cur) {
 903                         __prev_stmt = prev;
 904                         __next_stmt = next;
 905                         __cur_stmt = cur;
 906                         __split_stmt(cur);
 907                 }
 908                 prev = cur;
 909                 cur = next;
 910         } END_FOR_EACH_PTR(next);
 911         if (cur) {
 912                 __prev_stmt = prev;
 913                 __cur_stmt = cur;
 914                 __next_stmt = NULL;
 915                 __split_stmt(cur);
 916         }
 917
 918         /*
 919          * For function scope, then delay calling the scope hooks until the
 920          * end of function hooks can run.  I'm not positive this is the right
 921          * thing...
 922          */
 923         if (!is_last_stmt(cur))
 924                 __call_scope_hooks();
 925 }
 926
 927 /*
 928  * This is a hack, work around for detecting empty functions.
 929  */
 930 static int need_delayed_scope_hooks(void)
 931 {
 932         struct symbol *fn = get_base_type(cur_func_sym);
 933         struct statement *stmt;
 934
 935         if (!fn)
 936                 return 0;
 937         stmt = fn->stmt;
 938         if (!stmt)
 939                 stmt = fn->inline_stmt;
 940         if (stmt && stmt->type == STMT_COMPOUND)
 941                 return 1;
 942         return 0;
 943 }
 944
 945 void __split_label_stmt(struct statement *stmt)
 946 {
 947         if (stmt->label_identifier &&
 948             stmt->label_identifier->type == SYM_LABEL &&
 949             stmt->label_identifier->ident) {
 950                 loop_count |= 0x80000000;
 951                 __merge_gotos(stmt->label_identifier->ident->name);
 952         }
 953 }
 954
 955 static void find_asm_gotos(struct statement *stmt)
 956 {
 957         struct symbol *sym;
 958
 959         FOR_EACH_PTR(stmt->asm_labels, sym) {
 960                 if (sym->ident)
 961                         __save_gotos(sym->ident->name);
 962         } END_FOR_EACH_PTR(sym);
 963 }
 964
 965 void __split_stmt(struct statement *stmt)
 966 {
 967         sval_t sval;
 968
 969         if (!stmt)
 970                 goto out;
 971
 972         if (__bail_on_rest_of_function)
 973                 return;
 974
 975         if (out_of_memory() || taking_too_long()) {
 976
 977                 __bail_on_rest_of_function = 1;
 978                 final_pass = 1;
 979                 sm_msg("Function too hairy.  Giving up.");
 980                 fake_a_return();
 981                 final_pass = 0;  /* turn off sm_msg() from here */
 982                 return;
 983         }
 984
 985         add_ptr_list(&big_statement_stack, stmt);
 986         free_expression_stack(&big_expression_stack);
 987         set_position(stmt->pos);
 988         __pass_to_client(stmt, STMT_HOOK);
 989
 990         switch (stmt->type) {
 991         case STMT_DECLARATION:
 992                 split_declaration(stmt->declaration);
 993                 break;
 994         case STMT_RETURN:
 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                 __split_expr(stmt->expression);
1002                 break;
1003         case STMT_COMPOUND:
1004                 split_compound(stmt);
1005                 break;
1006         case STMT_IF:
1007                 set_parent_stmt(stmt->if_true, stmt);
1008                 set_parent_stmt(stmt->if_false, stmt);
1009
1010                 if (known_condition_true(stmt->if_conditional)) {
1011                         __split_stmt(stmt->if_true);
1012                         break;
1013                 }
1014                 if (known_condition_false(stmt->if_conditional)) {
1015                         __split_stmt(stmt->if_false);
1016                         break;
1017                 }
1018                 __split_whole_condition(stmt->if_conditional);
1019                 __split_stmt(stmt->if_true);
1020                 if (empty_statement(stmt->if_true) &&
1021                         last_stmt_on_same_line() &&
1022                         !get_macro_name(stmt->if_true->pos))
1023                         sm_msg("warn: if();");
1024                 __push_true_states();
1025                 __use_false_states();
1026                 __split_stmt(stmt->if_false);
1027                 __merge_true_states();
1028                 break;
1029         case STMT_ITERATOR:
1030                 set_parent_stmt(stmt->iterator_pre_statement, stmt);
1031                 set_parent_stmt(stmt->iterator_statement, stmt);
1032                 set_parent_stmt(stmt->iterator_post_statement, stmt);
1033
1034                 if (stmt->iterator_pre_condition)
1035                         handle_pre_loop(stmt);
1036                 else if (stmt->iterator_post_condition)
1037                         handle_post_loop(stmt);
1038                 else {
1039                         // these are for(;;) type loops.
1040                         handle_pre_loop(stmt);
1041                 }
1042                 break;
1043         case STMT_SWITCH:
1044                 set_parent_stmt(stmt->switch_statement, stmt);
1045
1046                 if (get_value(stmt->switch_expression, &sval)) {
1047                         split_known_switch(stmt, sval);
1048                         break;
1049                 }
1050                 __split_expr(stmt->switch_expression);
1051                 push_expression(&switch_expr_stack, stmt->switch_expression);
1052                 __save_switch_states(top_expression(switch_expr_stack));
1053                 nullify_path();
1054                 __push_default();
1055                 __push_breaks();
1056                 __split_stmt(stmt->switch_statement);
1057                 if (!__pop_default())
1058                         fake_an_empty_default(stmt->pos);
1059                 __discard_switches();
1060                 __merge_breaks();
1061                 pop_expression(&switch_expr_stack);
1062                 break;
1063         case STMT_CASE:
1064                 split_case(stmt);
1065                 break;
1066         case STMT_LABEL:
1067                 __split_label_stmt(stmt);
1068                 __split_stmt(stmt->label_statement);
1069                 break;
1070         case STMT_GOTO:
1071                 __split_expr(stmt->goto_expression);
1072                 if (stmt->goto_label && stmt->goto_label->type == SYM_NODE) {
1073                         if (!strcmp(stmt->goto_label->ident->name, "break")) {
1074                                 __process_breaks();
1075                         } else if (!strcmp(stmt->goto_label->ident->name,
1076                                            "continue")) {
1077                                 __process_continues();
1078                         }
1079                 } else if (stmt->goto_label &&
1080                            stmt->goto_label->type == SYM_LABEL &&
1081                            stmt->goto_label->ident) {
1082                         __save_gotos(stmt->goto_label->ident->name);
1083                 }
1084                 nullify_path();
1085                 if (is_last_stmt(stmt))
1086                         handle_backward_goto(stmt);
1087                 break;
1088         case STMT_NONE:
1089                 break;
1090         case STMT_ASM:
1091                 find_asm_gotos(stmt);
1092                 __pass_to_client(stmt, ASM_HOOK);
1093                 __split_expr(stmt->asm_string);
1094                 split_asm_constraints(stmt->asm_outputs);
1095                 split_asm_constraints(stmt->asm_inputs);
1096                 split_asm_constraints(stmt->asm_clobbers);
1097                 break;
1098         case STMT_CONTEXT:
1099                 break;
1100         case STMT_RANGE:
1101                 __split_expr(stmt->range_expression);
1102                 __split_expr(stmt->range_low);
1103                 __split_expr(stmt->range_high);
1104                 break;
1105         }
1106         __pass_to_client(stmt, STMT_HOOK_AFTER);
1107 out:
1108         __process_post_op_stack();
1109 }
1110
1111 static void split_expr_list(struct expression_list *expr_list, struct expression *parent)
1112 {
1113         struct expression *expr;
1114
1115         FOR_EACH_PTR(expr_list, expr) {
1116                 set_parent_expr(expr, parent);
1117                 __split_expr(expr);
1118                 __process_post_op_stack();
1119         } END_FOR_EACH_PTR(expr);
1120 }
1121
1122 static void split_sym(struct symbol *sym)
1123 {
1124         if (!sym)
1125                 return;
1126         if (!(sym->namespace & NS_SYMBOL))
1127                 return;
1128
1129         __split_stmt(sym->stmt);
1130         __split_expr(sym->array_size);
1131         split_symlist(sym->arguments);
1132         split_symlist(sym->symbol_list);
1133         __split_stmt(sym->inline_stmt);
1134         split_symlist(sym->inline_symbol_list);
1135 }
1136
1137 static void split_symlist(struct symbol_list *sym_list)
1138 {
1139         struct symbol *sym;
1140
1141         FOR_EACH_PTR(sym_list, sym) {
1142                 split_sym(sym);
1143         } END_FOR_EACH_PTR(sym);
1144 }
1145
1146 typedef void (fake_cb)(struct expression *expr);
1147
1148 static int member_to_number(struct expression *expr, struct ident *member)
1149 {
1150         struct symbol *type, *tmp;
1151         char *name;
1152         int i;
1153
1154         if (!member)
1155                 return -1;
1156         name = member->name;
1157
1158         type = get_type(expr);
1159         if (!type || type->type != SYM_STRUCT)
1160                 return -1;
1161
1162         i = -1;
1163         FOR_EACH_PTR(type->symbol_list, tmp) {
1164                 i++;
1165                 if (!tmp->ident)
1166                         continue;
1167                 if (strcmp(name, tmp->ident->name) == 0)
1168                         return i;
1169         } END_FOR_EACH_PTR(tmp);
1170         return -1;
1171 }
1172
1173 static struct ident *number_to_member(struct expression *expr, int num)
1174 {
1175         struct symbol *type, *member;
1176         int i = 0;
1177
1178         type = get_type(expr);
1179         if (!type || type->type != SYM_STRUCT)
1180                 return NULL;
1181
1182         FOR_EACH_PTR(type->symbol_list, member) {
1183                 if (i == num)
1184                         return member->ident;
1185                 i++;
1186         } END_FOR_EACH_PTR(member);
1187         return NULL;
1188 }
1189
1190 static void fake_element_assigns_helper(struct expression *array, struct expression_list *expr_list, fake_cb *fake_cb);
1191
1192 struct member_set {
1193         struct ident *ident;
1194         int set;
1195 };
1196
1197 static struct member_set *alloc_member_set(struct symbol *type)
1198 {
1199         struct member_set *member_set;
1200         struct symbol *member;
1201         int member_count;
1202         int member_idx;
1203
1204         member_count = ptr_list_size((struct ptr_list *)type->symbol_list);
1205         member_set = malloc(member_count * sizeof(*member_set));
1206         member_idx = 0;
1207         FOR_EACH_PTR(type->symbol_list, member) {
1208                 member_set[member_idx].ident = member->ident;
1209                 member_set[member_idx].set = 0;
1210                 member_idx++;
1211         } END_FOR_EACH_PTR(member);
1212
1213         return member_set;
1214 }
1215
1216 static void mark_member_as_set(struct symbol *type, struct member_set *member_set, struct ident *ident)
1217 {
1218         int member_count = ptr_list_size((struct ptr_list *)type->symbol_list);
1219         int i;
1220
1221         for (i = 0; i < member_count; i++) {
1222                 if (member_set[i].ident == ident) {
1223                         member_set[i].set = 1;
1224                         return;
1225                 }
1226         }
1227 //      crap.  this is buggy.
1228 //      sm_msg("internal smatch error in initializer %s.%s", type->ident->name, ident->name);
1229 }
1230
1231 static void set_inner_struct_members(struct expression *expr, struct symbol *member)
1232 {
1233         struct expression *edge_member, *assign;
1234         struct symbol *base = get_real_base_type(member);
1235         struct symbol *tmp;
1236
1237         if (member->ident)
1238                 expr = member_expression(expr, '.', member->ident);
1239
1240         FOR_EACH_PTR(base->symbol_list, tmp) {
1241                 struct symbol *type;
1242
1243                 type = get_real_base_type(tmp);
1244                 if (!type)
1245                         continue;
1246
1247                 if (tmp->ident) {
1248                         edge_member = member_expression(expr, '.', tmp->ident);
1249                         if (get_state_expr(SMATCH_EXTRA, edge_member))
1250                                 continue;
1251                 }
1252
1253                 if (type->type == SYM_UNION || type->type == SYM_STRUCT) {
1254                         set_inner_struct_members(expr, tmp);
1255                         continue;
1256                 }
1257
1258                 if (!tmp->ident)
1259                         continue;
1260
1261                 assign = assign_expression(edge_member, zero_expr());
1262                 __split_expr(assign);
1263         } END_FOR_EACH_PTR(tmp);
1264
1265
1266 }
1267
1268 static void set_unset_to_zero(struct symbol *type, struct expression *expr)
1269 {
1270         struct symbol *tmp;
1271         struct expression *member = NULL;
1272         struct expression *assign;
1273         int op = '*';
1274
1275         if (expr->type == EXPR_PREOP && expr->op == '&') {
1276                 expr = strip_expr(expr->unop);
1277                 op = '.';
1278         }
1279
1280         FOR_EACH_PTR(type->symbol_list, tmp) {
1281                 type = get_real_base_type(tmp);
1282                 if (!type)
1283                         continue;
1284
1285                 if (tmp->ident) {
1286                         member = member_expression(expr, op, tmp->ident);
1287                         if (get_state_expr(SMATCH_EXTRA, member))
1288                                 continue;
1289                 }
1290
1291                 if (type->type == SYM_UNION || type->type == SYM_STRUCT) {
1292                         set_inner_struct_members(expr, tmp);
1293                         continue;
1294                 }
1295                 if (type->type == SYM_ARRAY)
1296                         continue;
1297                 if (!tmp->ident)
1298                         continue;
1299
1300                 assign = assign_expression(member, zero_expr());
1301                 __split_expr(assign);
1302         } END_FOR_EACH_PTR(tmp);
1303 }
1304
1305 static void fake_member_assigns_helper(struct expression *symbol, struct expression_list *members, fake_cb *fake_cb)
1306 {
1307         struct expression *deref, *assign, *tmp;
1308         struct symbol *struct_type, *type;
1309         struct ident *member;
1310         int member_idx;
1311         struct member_set *member_set;
1312
1313         struct_type = get_type(symbol);
1314         if (!struct_type ||
1315             (struct_type->type != SYM_STRUCT && struct_type->type != SYM_UNION))
1316                 return;
1317
1318         member_set = alloc_member_set(struct_type);
1319
1320         member_idx = 0;
1321         FOR_EACH_PTR(members, tmp) {
1322                 member = number_to_member(symbol, member_idx);
1323                 while (tmp->type == EXPR_IDENTIFIER) {
1324                         member = tmp->expr_ident;
1325                         member_idx = member_to_number(symbol, member);
1326                         tmp = tmp->ident_expression;
1327                 }
1328                 mark_member_as_set(struct_type, member_set, member);
1329                 member_idx++;
1330                 deref = member_expression(symbol, '.', member);
1331                 if (tmp->type == EXPR_INITIALIZER) {
1332                         type = get_type(deref);
1333                         if (type && type->type == SYM_ARRAY)
1334                                 fake_element_assigns_helper(deref, tmp->expr_list, fake_cb);
1335                         else
1336                                 fake_member_assigns_helper(deref, tmp->expr_list, fake_cb);
1337                 } else {
1338                         assign = assign_expression(deref, tmp);
1339                         fake_cb(assign);
1340                 }
1341         } END_FOR_EACH_PTR(tmp);
1342
1343         set_unset_to_zero(struct_type, symbol);
1344 }
1345
1346 static void fake_member_assigns(struct symbol *sym, fake_cb *fake_cb)
1347 {
1348         fake_member_assigns_helper(symbol_expression(sym),
1349                                    sym->initializer->expr_list, fake_cb);
1350 }
1351
1352 static void fake_element_assigns_helper(struct expression *array, struct expression_list *expr_list, fake_cb *fake_cb)
1353 {
1354         struct expression *offset, *binop, *assign, *tmp;
1355         struct symbol *type;
1356         int idx;
1357
1358         if (ptr_list_size((struct ptr_list *)expr_list) > 1000)
1359                 return;
1360
1361         idx = 0;
1362         FOR_EACH_PTR(expr_list, tmp) {
1363                 if (tmp->type == EXPR_INDEX) {
1364                         if (tmp->idx_from != tmp->idx_to)
1365                                 return;
1366                         idx = tmp->idx_from;
1367                         if (!tmp->idx_expression)
1368                                 goto next;
1369                         tmp = tmp->idx_expression;
1370                 }
1371                 offset = value_expr(idx);
1372                 binop = array_element_expression(array, offset);
1373                 if (tmp->type == EXPR_INITIALIZER) {
1374                         type = get_type(binop);
1375                         if (type && type->type == SYM_ARRAY)
1376                                 fake_element_assigns_helper(binop, tmp->expr_list, fake_cb);
1377                         else
1378                                 fake_member_assigns_helper(binop, tmp->expr_list, fake_cb);
1379                 } else {
1380                         assign = assign_expression(binop, tmp);
1381                         fake_cb(assign);
1382                 }
1383 next:
1384                 idx++;
1385         } END_FOR_EACH_PTR(tmp);
1386 }
1387
1388 static void fake_element_assigns(struct symbol *sym, fake_cb *fake_cb)
1389 {
1390         fake_element_assigns_helper(symbol_expression(sym), sym->initializer->expr_list, fake_cb);
1391 }
1392
1393 static void fake_assign_expr(struct symbol *sym)
1394 {
1395         struct expression *assign, *symbol;
1396
1397         symbol = symbol_expression(sym);
1398         assign = assign_expression(symbol, sym->initializer);
1399         __split_expr(assign);
1400 }
1401
1402 static void call_split_expr(struct expression *expr)
1403 {
1404         __split_expr(expr);
1405 }
1406
1407 static void do_initializer_stuff(struct symbol *sym)
1408 {
1409         if (!sym->initializer)
1410                 return;
1411
1412         if (sym->initializer->type == EXPR_INITIALIZER) {
1413                 if (get_real_base_type(sym)->type == SYM_ARRAY)
1414                         fake_element_assigns(sym, call_split_expr);
1415                 else
1416                         fake_member_assigns(sym, call_split_expr);
1417         } else {
1418                 fake_assign_expr(sym);
1419         }
1420 }
1421
1422 static void split_declaration(struct symbol_list *sym_list)
1423 {
1424         struct symbol *sym;
1425
1426         FOR_EACH_PTR(sym_list, sym) {
1427                 __pass_to_client(sym, DECLARATION_HOOK);
1428                 do_initializer_stuff(sym);
1429                 split_sym(sym);
1430         } END_FOR_EACH_PTR(sym);
1431 }
1432
1433 static void call_global_assign_hooks(struct expression *assign)
1434 {
1435         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1436 }
1437
1438 static void fake_global_assign(struct symbol *sym)
1439 {
1440         struct expression *assign, *symbol;
1441
1442         if (get_real_base_type(sym)->type == SYM_ARRAY) {
1443                 if (sym->initializer && sym->initializer->type == EXPR_INITIALIZER) {
1444                         fake_element_assigns(sym, call_global_assign_hooks);
1445                 } else if (sym->initializer) {
1446                         symbol = symbol_expression(sym);
1447                         assign = assign_expression(symbol, sym->initializer);
1448                         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1449                 } else {
1450                         fake_element_assigns_helper(symbol_expression(sym), NULL, call_global_assign_hooks);
1451                 }
1452         } else if (get_real_base_type(sym)->type == SYM_STRUCT) {
1453                 if (sym->initializer && sym->initializer->type == EXPR_INITIALIZER) {
1454                         fake_member_assigns(sym, call_global_assign_hooks);
1455                 } else if (sym->initializer) {
1456                         symbol = symbol_expression(sym);
1457                         assign = assign_expression(symbol, sym->initializer);
1458                         __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1459                 } else {
1460                         fake_member_assigns_helper(symbol_expression(sym), NULL, call_global_assign_hooks);
1461                 }
1462         } else {
1463                 symbol = symbol_expression(sym);
1464                 if (sym->initializer)
1465                         assign = assign_expression(symbol, sym->initializer);
1466                 else
1467                         assign = assign_expression(symbol, zero_expr());
1468                 __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1469         }
1470 }
1471
1472 static void start_function_definition(struct symbol *sym)
1473 {
1474         __in_function_def = 1;
1475         __pass_to_client(sym, FUNC_DEF_HOOK);
1476         __in_function_def = 0;
1477         __pass_to_client(sym, AFTER_DEF_HOOK);
1478
1479 }
1480
1481 static void split_function(struct symbol *sym)
1482 {
1483         struct symbol *base_type = get_base_type(sym);
1484
1485         if (!base_type->stmt && !base_type->inline_stmt)
1486                 return;
1487
1488         gettimeofday(&fn_start_time, NULL);
1489         cur_func_sym = sym;
1490         if (sym->ident)
1491                 cur_func = sym->ident->name;
1492         set_position(sym->pos);
1493         loop_count = 0;
1494         last_goto_statement_handled = 0;
1495         sm_debug("new function:  %s\n", cur_func);
1496         __stree_id = 0;
1497         if (option_two_passes) {
1498                 __unnullify_path();
1499                 loop_num = 0;
1500                 final_pass = 0;
1501                 start_function_definition(sym);
1502                 __split_stmt(base_type->stmt);
1503                 __split_stmt(base_type->inline_stmt);
1504                 nullify_path();
1505         }
1506         __unnullify_path();
1507         loop_num = 0;
1508         final_pass = 1;
1509         start_function_definition(sym);
1510         __split_stmt(base_type->stmt);
1511         __split_stmt(base_type->inline_stmt);
1512         __pass_to_client(sym, END_FUNC_HOOK);
1513         if (need_delayed_scope_hooks())
1514                 __call_scope_hooks();
1515         __pass_to_client(sym, AFTER_FUNC_HOOK);
1516
1517         clear_all_states();
1518         cur_func_sym = NULL;
1519         cur_func = NULL;
1520         free_data_info_allocs();
1521         free_expression_stack(&switch_expr_stack);
1522         __free_ptr_list((struct ptr_list **)&big_statement_stack);
1523         __bail_on_rest_of_function = 0;
1524 }
1525
1526 static void parse_inline(struct expression *call)
1527 {
1528         struct symbol *base_type;
1529         int loop_num_bak = loop_num;
1530         int loop_count_bak = loop_count;
1531         int final_pass_bak = final_pass;
1532         char *cur_func_bak = cur_func;
1533         struct statement_list *big_statement_stack_bak = big_statement_stack;
1534         struct expression_list *big_expression_stack_bak = big_expression_stack;
1535         struct expression_list *big_condition_stack_bak = big_condition_stack;
1536         struct expression_list *switch_expr_stack_bak = switch_expr_stack;
1537         struct symbol *cur_func_sym_bak = cur_func_sym;
1538
1539         __pass_to_client(call, INLINE_FN_START);
1540         final_pass = 0;  /* don't print anything */
1541         __inline_fn = call;
1542
1543         base_type = get_base_type(call->fn->symbol);
1544         cur_func_sym = call->fn->symbol;
1545         if (call->fn->symbol->ident)
1546                 cur_func = call->fn->symbol->ident->name;
1547         else
1548                 cur_func = NULL;
1549         set_position(call->fn->symbol->pos);
1550
1551         save_all_states();
1552         big_statement_stack = NULL;
1553         big_expression_stack = NULL;
1554         big_condition_stack = NULL;
1555         switch_expr_stack = NULL;
1556
1557         sm_debug("inline function:  %s\n", cur_func);
1558         __unnullify_path();
1559         loop_num = 0;
1560         start_function_definition(call->fn->symbol);
1561         __split_stmt(base_type->stmt);
1562         __split_stmt(base_type->inline_stmt);
1563         __pass_to_client(call->fn->symbol, END_FUNC_HOOK);
1564         __pass_to_client(call->fn->symbol, AFTER_FUNC_HOOK);
1565
1566         free_expression_stack(&switch_expr_stack);
1567         __free_ptr_list((struct ptr_list **)&big_statement_stack);
1568         nullify_path();
1569         free_goto_stack();
1570
1571         loop_num = loop_num_bak;
1572         loop_count = loop_count_bak;
1573         final_pass = final_pass_bak;
1574         cur_func_sym = cur_func_sym_bak;
1575         cur_func = cur_func_bak;
1576         big_statement_stack = big_statement_stack_bak;
1577         big_expression_stack = big_expression_stack_bak;
1578         big_condition_stack = big_condition_stack_bak;
1579         switch_expr_stack = switch_expr_stack_bak;
1580
1581         restore_all_states();
1582         set_position(call->pos);
1583         __inline_fn = NULL;
1584         __pass_to_client(call, INLINE_FN_END);
1585 }
1586
1587 static struct symbol_list *inlines_called;
1588 static void add_inline_function(struct symbol *sym)
1589 {
1590         static struct symbol_list *already_added;
1591         struct symbol *tmp;
1592
1593         FOR_EACH_PTR(already_added, tmp) {
1594                 if (tmp == sym)
1595                         return;
1596         } END_FOR_EACH_PTR(tmp);
1597
1598         add_ptr_list(&already_added, sym);
1599         add_ptr_list(&inlines_called, sym);
1600 }
1601
1602 static void process_inlines(void)
1603 {
1604         struct symbol *tmp;
1605
1606         FOR_EACH_PTR(inlines_called, tmp) {
1607                 split_function(tmp);
1608         } END_FOR_EACH_PTR(tmp);
1609         free_ptr_list(&inlines_called);
1610 }
1611
1612 static struct symbol *get_last_scoped_symbol(struct symbol_list *big_list, int use_static)
1613 {
1614         struct symbol *sym;
1615
1616         FOR_EACH_PTR_REVERSE(big_list, sym) {
1617                 if (!sym->scope)
1618                         continue;
1619                 if (use_static && sym->ctype.modifiers & MOD_STATIC)
1620                         return sym;
1621                 if (!use_static && !(sym->ctype.modifiers & MOD_STATIC))
1622                         return sym;
1623         } END_FOR_EACH_PTR_REVERSE(sym);
1624
1625         return NULL;
1626 }
1627
1628 static void split_inlines_in_scope(struct symbol *sym)
1629 {
1630         struct symbol *base;
1631         struct symbol_list *scope_list;
1632         int stream;
1633
1634         scope_list = sym->scope->symbols;
1635         stream = sym->pos.stream;
1636
1637         /* find the last static symbol in the file */
1638         FOR_EACH_PTR_REVERSE(scope_list, sym) {
1639                 if (sym->pos.stream != stream)
1640                         continue;
1641                 if (sym->type != SYM_NODE)
1642                         continue;
1643                 base = get_base_type(sym);
1644                 if (!base)
1645                         continue;
1646                 if (base->type != SYM_FN)
1647                         continue;
1648                 if (!base->inline_stmt)
1649                         continue;
1650                 add_inline_function(sym);
1651         } END_FOR_EACH_PTR_REVERSE(sym);
1652
1653         process_inlines();
1654 }
1655
1656 static void split_inlines(struct symbol_list *sym_list)
1657 {
1658         struct symbol *sym;
1659
1660         sym = get_last_scoped_symbol(sym_list, 0);
1661         if (sym)
1662                 split_inlines_in_scope(sym);
1663         sym = get_last_scoped_symbol(sym_list, 1);
1664         if (sym)
1665                 split_inlines_in_scope(sym);
1666 }
1667
1668 static struct stree *clone_estates_perm(struct stree *orig)
1669 {
1670         struct stree *ret = NULL;
1671         struct sm_state *tmp;
1672
1673         FOR_EACH_SM(orig, tmp) {
1674                 set_state_stree_perm(&ret, tmp->owner, tmp->name, tmp->sym, clone_estate_perm(tmp->state));
1675         } END_FOR_EACH_SM(tmp);
1676
1677         return ret;
1678 }
1679
1680 struct position last_pos;
1681 static void split_functions(struct symbol_list *sym_list)
1682 {
1683         struct symbol *sym;
1684
1685         __unnullify_path();
1686         FOR_EACH_PTR(sym_list, sym) {
1687                 set_position(sym->pos);
1688                 if (sym->type != SYM_NODE || get_base_type(sym)->type != SYM_FN) {
1689                         __pass_to_client(sym, BASE_HOOK);
1690                         fake_global_assign(sym);
1691                 }
1692         } END_FOR_EACH_PTR(sym);
1693         global_states = clone_estates_perm(get_all_states_stree(SMATCH_EXTRA));
1694         nullify_path();
1695
1696         FOR_EACH_PTR(sym_list, sym) {
1697                 set_position(sym->pos);
1698                 if (sym->type == SYM_NODE && get_base_type(sym)->type == SYM_FN) {
1699                         split_function(sym);
1700                         process_inlines();
1701                 }
1702                 last_pos = sym->pos;
1703         } END_FOR_EACH_PTR(sym);
1704         split_inlines(sym_list);
1705         __pass_to_client(sym_list, END_FILE_HOOK);
1706 }
1707
1708 void smatch(int argc, char **argv)
1709 {
1710         struct string_list *filelist = NULL;
1711         struct symbol_list *sym_list;
1712         struct timeval stop, start;
1713
1714         gettimeofday(&start, NULL);
1715
1716         if (argc < 2) {
1717                 printf("Usage:  smatch [--debug] <filename.c>\n");
1718                 exit(1);
1719         }
1720         sparse_initialize(argc, argv, &filelist);
1721         set_valid_ptr_max();
1722         FOR_EACH_PTR_NOTAG(filelist, base_file) {
1723                 if (option_file_output) {
1724                         char buf[256];
1725
1726                         snprintf(buf, sizeof(buf), "%s.smatch", base_file);
1727                         sm_outfd = fopen(buf, "w");
1728                         if (!sm_outfd) {
1729                                 printf("Error:  Cannot open %s\n", base_file);
1730                                 exit(1);
1731                         }
1732                 }
1733                 sym_list = sparse_keep_tokens(base_file);
1734                 split_functions(sym_list);
1735         } END_FOR_EACH_PTR_NOTAG(base_file);
1736
1737         gettimeofday(&stop, NULL);
1738
1739         set_position(last_pos);
1740         if (option_time)
1741                 sm_msg("time: %lu", stop.tv_sec - start.tv_sec);
1742 }