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debug: add a __smatch_absolute()
[smatch.git] / smatch_flow.c
blob9d71a3cf8dda7c880499c6fa575d4360e5c5f959
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 }
Static analysis for C