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check_kernel_printf.c: handle new definition of KERN_CONT
[smatch.git] / smatch_flow.c
blobb23141db6d4342e7e932f6393f4f85f54552b598
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, NULL);
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, NULL);
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, NULL);
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, NULL);
626 __split_stmt(stmt->iterator_statement);
627 __merge_continues();
628 if (!is_zero(stmt->iterator_post_condition))
629 __save_gotos(loop_name, NULL);
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, stmt->label_identifier);
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 __save_gotos(sym->ident->name, sym);
961 } END_FOR_EACH_PTR(sym);
962 }
963
964 void __split_stmt(struct statement *stmt)
965 {
966 sval_t sval;
967
968 if (!stmt)
969 goto out;
970
971 if (__bail_on_rest_of_function)
972 return;
973
974 if (out_of_memory() || taking_too_long()) {
975
976 __bail_on_rest_of_function = 1;
977 final_pass = 1;
978 sm_msg("Function too hairy. Giving up.");
979 fake_a_return();
980 final_pass = 0; /* turn off sm_msg() from here */
981 return;
982 }
983
984 add_ptr_list(&big_statement_stack, stmt);
985 free_expression_stack(&big_expression_stack);
986 set_position(stmt->pos);
987 __pass_to_client(stmt, STMT_HOOK);
988
989 switch (stmt->type) {
990 case STMT_DECLARATION:
991 split_declaration(stmt->declaration);
992 break;
993 case STMT_RETURN:
994 __split_expr(stmt->ret_value);
995 __pass_to_client(stmt->ret_value, RETURN_HOOK);
996 __process_post_op_stack();
997 nullify_path();
998 break;
999 case STMT_EXPRESSION:
1000 __split_expr(stmt->expression);
1001 break;
1002 case STMT_COMPOUND:
1003 split_compound(stmt);
1004 break;
1005 case STMT_IF:
1006 set_parent_stmt(stmt->if_true, stmt);
1007 set_parent_stmt(stmt->if_false, stmt);
1008
1009 if (known_condition_true(stmt->if_conditional)) {
1010 __split_stmt(stmt->if_true);
1011 break;
1012 }
1013 if (known_condition_false(stmt->if_conditional)) {
1014 __split_stmt(stmt->if_false);
1015 break;
1016 }
1017 __split_whole_condition(stmt->if_conditional);
1018 __split_stmt(stmt->if_true);
1019 if (empty_statement(stmt->if_true) &&
1020 last_stmt_on_same_line() &&
1021 !get_macro_name(stmt->if_true->pos))
1022 sm_msg("warn: if();");
1023 __push_true_states();
1024 __use_false_states();
1025 __split_stmt(stmt->if_false);
1026 __merge_true_states();
1027 break;
1028 case STMT_ITERATOR:
1029 set_parent_stmt(stmt->iterator_pre_statement, stmt);
1030 set_parent_stmt(stmt->iterator_statement, stmt);
1031 set_parent_stmt(stmt->iterator_post_statement, stmt);
1032
1033 if (stmt->iterator_pre_condition)
1034 handle_pre_loop(stmt);
1035 else if (stmt->iterator_post_condition)
1036 handle_post_loop(stmt);
1037 else {
1038 // these are for(;;) type loops.
1039 handle_pre_loop(stmt);
1040 }
1041 break;
1042 case STMT_SWITCH:
1043 set_parent_stmt(stmt->switch_statement, stmt);
1044
1045 if (get_value(stmt->switch_expression, &sval)) {
1046 split_known_switch(stmt, sval);
1047 break;
1048 }
1049 __split_expr(stmt->switch_expression);
1050 push_expression(&switch_expr_stack, stmt->switch_expression);
1051 __save_switch_states(top_expression(switch_expr_stack));
1052 nullify_path();
1053 __push_default();
1054 __push_breaks();
1055 __split_stmt(stmt->switch_statement);
1056 if (!__pop_default())
1057 fake_an_empty_default(stmt->pos);
1058 __discard_switches();
1059 __merge_breaks();
1060 pop_expression(&switch_expr_stack);
1061 break;
1062 case STMT_CASE:
1063 split_case(stmt);
1064 break;
1065 case STMT_LABEL:
1066 __split_label_stmt(stmt);
1067 __split_stmt(stmt->label_statement);
1068 break;
1069 case STMT_GOTO:
1070 __split_expr(stmt->goto_expression);
1071 if (stmt->goto_label && stmt->goto_label->type == SYM_NODE) {
1072 if (!strcmp(stmt->goto_label->ident->name, "break")) {
1073 __process_breaks();
1074 } else if (!strcmp(stmt->goto_label->ident->name,
1075 "continue")) {
1076 __process_continues();
1077 }
1078 } else if (stmt->goto_label &&
1079 stmt->goto_label->type == SYM_LABEL &&
1080 stmt->goto_label->ident) {
1081 __save_gotos(stmt->goto_label->ident->name, stmt->goto_label);
1082 }
1083 nullify_path();
1084 if (is_last_stmt(stmt))
1085 handle_backward_goto(stmt);
1086 break;
1087 case STMT_NONE:
1088 break;
1089 case STMT_ASM:
1090 find_asm_gotos(stmt);
1091 __pass_to_client(stmt, ASM_HOOK);
1092 __split_expr(stmt->asm_string);
1093 split_asm_constraints(stmt->asm_outputs);
1094 split_asm_constraints(stmt->asm_inputs);
1095 split_asm_constraints(stmt->asm_clobbers);
1096 break;
1097 case STMT_CONTEXT:
1098 break;
1099 case STMT_RANGE:
1100 __split_expr(stmt->range_expression);
1101 __split_expr(stmt->range_low);
1102 __split_expr(stmt->range_high);
1103 break;
1104 }
1105 __pass_to_client(stmt, STMT_HOOK_AFTER);
1106 out:
1107 __process_post_op_stack();
1108 }
1109
1110 static void split_expr_list(struct expression_list *expr_list, struct expression *parent)
1111 {
1112 struct expression *expr;
1113
1114 FOR_EACH_PTR(expr_list, expr) {
1115 set_parent_expr(expr, parent);
1116 __split_expr(expr);
1117 __process_post_op_stack();
1118 } END_FOR_EACH_PTR(expr);
1119 }
1120
1121 static void split_sym(struct symbol *sym)
1122 {
1123 if (!sym)
1124 return;
1125 if (!(sym->namespace & NS_SYMBOL))
1126 return;
1127
1128 __split_stmt(sym->stmt);
1129 __split_expr(sym->array_size);
1130 split_symlist(sym->arguments);
1131 split_symlist(sym->symbol_list);
1132 __split_stmt(sym->inline_stmt);
1133 split_symlist(sym->inline_symbol_list);
1134 }
1135
1136 static void split_symlist(struct symbol_list *sym_list)
1137 {
1138 struct symbol *sym;
1139
1140 FOR_EACH_PTR(sym_list, sym) {
1141 split_sym(sym);
1142 } END_FOR_EACH_PTR(sym);
1143 }
1144
1145 typedef void (fake_cb)(struct expression *expr);
1146
1147 static int member_to_number(struct expression *expr, struct ident *member)
1148 {
1149 struct symbol *type, *tmp;
1150 char *name;
1151 int i;
1152
1153 if (!member)
1154 return -1;
1155 name = member->name;
1156
1157 type = get_type(expr);
1158 if (!type || type->type != SYM_STRUCT)
1159 return -1;
1160
1161 i = -1;
1162 FOR_EACH_PTR(type->symbol_list, tmp) {
1163 i++;
1164 if (!tmp->ident)
1165 continue;
1166 if (strcmp(name, tmp->ident->name) == 0)
1167 return i;
1168 } END_FOR_EACH_PTR(tmp);
1169 return -1;
1170 }
1171
1172 static struct ident *number_to_member(struct expression *expr, int num)
1173 {
1174 struct symbol *type, *member;
1175 int i = 0;
1176
1177 type = get_type(expr);
1178 if (!type || type->type != SYM_STRUCT)
1179 return NULL;
1180
1181 FOR_EACH_PTR(type->symbol_list, member) {
1182 if (i == num)
1183 return member->ident;
1184 i++;
1185 } END_FOR_EACH_PTR(member);
1186 return NULL;
1187 }
1188
1189 static void fake_element_assigns_helper(struct expression *array, struct expression_list *expr_list, fake_cb *fake_cb);
1190
1191 struct member_set {
1192 struct ident *ident;
1193 int set;
1194 };
1195
1196 static struct member_set *alloc_member_set(struct symbol *type)
1197 {
1198 struct member_set *member_set;
1199 struct symbol *member;
1200 int member_count;
1201 int member_idx;
1202
1203 member_count = ptr_list_size((struct ptr_list *)type->symbol_list);
1204 member_set = malloc(member_count * sizeof(*member_set));
1205 member_idx = 0;
1206 FOR_EACH_PTR(type->symbol_list, member) {
1207 member_set[member_idx].ident = member->ident;
1208 member_set[member_idx].set = 0;
1209 member_idx++;
1210 } END_FOR_EACH_PTR(member);
1211
1212 return member_set;
1213 }
1214
1215 static void mark_member_as_set(struct symbol *type, struct member_set *member_set, struct ident *ident)
1216 {
1217 int member_count = ptr_list_size((struct ptr_list *)type->symbol_list);
1218 int i;
1219
1220 for (i = 0; i < member_count; i++) {
1221 if (member_set[i].ident == ident) {
1222 member_set[i].set = 1;
1223 return;
1224 }
1225 }
1226 // crap. this is buggy.
1227 // sm_msg("internal smatch error in initializer %s.%s", type->ident->name, ident->name);
1228 }
1229
1230 static void set_inner_struct_members(struct expression *expr, struct symbol *member)
1231 {
1232 struct expression *edge_member, *assign;
1233 struct symbol *base = get_real_base_type(member);
1234 struct symbol *tmp;
1235
1236 if (member->ident)
1237 expr = member_expression(expr, '.', member->ident);
1238
1239 FOR_EACH_PTR(base->symbol_list, tmp) {
1240 struct symbol *type;
1241
1242 type = get_real_base_type(tmp);
1243 if (!type)
1244 continue;
1245
1246 if (tmp->ident) {
1247 edge_member = member_expression(expr, '.', tmp->ident);
1248 if (get_state_expr(SMATCH_EXTRA, edge_member))
1249 continue;
1250 }
1251
1252 if (type->type == SYM_UNION || type->type == SYM_STRUCT) {
1253 set_inner_struct_members(expr, tmp);
1254 continue;
1255 }
1256
1257 if (!tmp->ident)
1258 continue;
1259
1260 assign = assign_expression(edge_member, zero_expr());
1261 __split_expr(assign);
1262 } END_FOR_EACH_PTR(tmp);
1263
1264
1265 }
1266
1267 static void set_unset_to_zero(struct symbol *type, struct expression *expr)
1268 {
1269 struct symbol *tmp;
1270 struct expression *member = NULL;
1271 struct expression *assign;
1272 int op = '*';
1273
1274 if (expr->type == EXPR_PREOP && expr->op == '&') {
1275 expr = strip_expr(expr->unop);
1276 op = '.';
1277 }
1278
1279 FOR_EACH_PTR(type->symbol_list, tmp) {
1280 type = get_real_base_type(tmp);
1281 if (!type)
1282 continue;
1283
1284 if (tmp->ident) {
1285 member = member_expression(expr, op, tmp->ident);
1286 if (get_state_expr(SMATCH_EXTRA, member))
1287 continue;
1288 }
1289
1290 if (type->type == SYM_UNION || type->type == SYM_STRUCT) {
1291 set_inner_struct_members(expr, tmp);
1292 continue;
1293 }
1294 if (type->type == SYM_ARRAY)
1295 continue;
1296 if (!tmp->ident)
1297 continue;
1298
1299 assign = assign_expression(member, zero_expr());
1300 __split_expr(assign);
1301 } END_FOR_EACH_PTR(tmp);
1302 }
1303
1304 static void fake_member_assigns_helper(struct expression *symbol, struct expression_list *members, fake_cb *fake_cb)
1305 {
1306 struct expression *deref, *assign, *tmp;
1307 struct symbol *struct_type, *type;
1308 struct ident *member;
1309 int member_idx;
1310 struct member_set *member_set;
1311
1312 struct_type = get_type(symbol);
1313 if (!struct_type ||
1314 (struct_type->type != SYM_STRUCT && struct_type->type != SYM_UNION))
1315 return;
1316
1317 member_set = alloc_member_set(struct_type);
1318
1319 member_idx = 0;
1320 FOR_EACH_PTR(members, tmp) {
1321 member = number_to_member(symbol, member_idx);
1322 while (tmp->type == EXPR_IDENTIFIER) {
1323 member = tmp->expr_ident;
1324 member_idx = member_to_number(symbol, member);
1325 tmp = tmp->ident_expression;
1326 }
1327 mark_member_as_set(struct_type, member_set, member);
1328 member_idx++;
1329 deref = member_expression(symbol, '.', member);
1330 if (tmp->type == EXPR_INITIALIZER) {
1331 type = get_type(deref);
1332 if (type && type->type == SYM_ARRAY)
1333 fake_element_assigns_helper(deref, tmp->expr_list, fake_cb);
1334 else
1335 fake_member_assigns_helper(deref, tmp->expr_list, fake_cb);
1336 } else {
1337 assign = assign_expression(deref, tmp);
1338 fake_cb(assign);
1339 }
1340 } END_FOR_EACH_PTR(tmp);
1341
1342 set_unset_to_zero(struct_type, symbol);
1343 }
1344
1345 static void fake_member_assigns(struct symbol *sym, fake_cb *fake_cb)
1346 {
1347 fake_member_assigns_helper(symbol_expression(sym),
1348 sym->initializer->expr_list, fake_cb);
1349 }
1350
1351 static void fake_element_assigns_helper(struct expression *array, struct expression_list *expr_list, fake_cb *fake_cb)
1352 {
1353 struct expression *offset, *binop, *assign, *tmp;
1354 struct symbol *type;
1355 int idx;
1356
1357 if (ptr_list_size((struct ptr_list *)expr_list) > 1000)
1358 return;
1359
1360 idx = 0;
1361 FOR_EACH_PTR(expr_list, tmp) {
1362 if (tmp->type == EXPR_INDEX) {
1363 if (tmp->idx_from != tmp->idx_to)
1364 return;
1365 idx = tmp->idx_from;
1366 if (!tmp->idx_expression)
1367 goto next;
1368 tmp = tmp->idx_expression;
1369 }
1370 offset = value_expr(idx);
1371 binop = array_element_expression(array, offset);
1372 if (tmp->type == EXPR_INITIALIZER) {
1373 type = get_type(binop);
1374 if (type && type->type == SYM_ARRAY)
1375 fake_element_assigns_helper(binop, tmp->expr_list, fake_cb);
1376 else
1377 fake_member_assigns_helper(binop, tmp->expr_list, fake_cb);
1378 } else {
1379 assign = assign_expression(binop, tmp);
1380 fake_cb(assign);
1381 }
1382 next:
1383 idx++;
1384 } END_FOR_EACH_PTR(tmp);
1385 }
1386
1387 static void fake_element_assigns(struct symbol *sym, fake_cb *fake_cb)
1388 {
1389 fake_element_assigns_helper(symbol_expression(sym), sym->initializer->expr_list, fake_cb);
1390 }
1391
1392 static void fake_assign_expr(struct symbol *sym)
1393 {
1394 struct expression *assign, *symbol;
1395
1396 symbol = symbol_expression(sym);
1397 assign = assign_expression(symbol, sym->initializer);
1398 __split_expr(assign);
1399 }
1400
1401 static void call_split_expr(struct expression *expr)
1402 {
1403 __split_expr(expr);
1404 }
1405
1406 static void do_initializer_stuff(struct symbol *sym)
1407 {
1408 if (!sym->initializer)
1409 return;
1410
1411 if (sym->initializer->type == EXPR_INITIALIZER) {
1412 if (get_real_base_type(sym)->type == SYM_ARRAY)
1413 fake_element_assigns(sym, call_split_expr);
1414 else
1415 fake_member_assigns(sym, call_split_expr);
1416 } else {
1417 fake_assign_expr(sym);
1418 }
1419 }
1420
1421 static void split_declaration(struct symbol_list *sym_list)
1422 {
1423 struct symbol *sym;
1424
1425 FOR_EACH_PTR(sym_list, sym) {
1426 __pass_to_client(sym, DECLARATION_HOOK);
1427 do_initializer_stuff(sym);
1428 split_sym(sym);
1429 } END_FOR_EACH_PTR(sym);
1430 }
1431
1432 static void call_global_assign_hooks(struct expression *assign)
1433 {
1434 __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1435 }
1436
1437 static void fake_global_assign(struct symbol *sym)
1438 {
1439 struct expression *assign, *symbol;
1440
1441 if (get_real_base_type(sym)->type == SYM_ARRAY) {
1442 if (sym->initializer && sym->initializer->type == EXPR_INITIALIZER) {
1443 fake_element_assigns(sym, call_global_assign_hooks);
1444 } else if (sym->initializer) {
1445 symbol = symbol_expression(sym);
1446 assign = assign_expression(symbol, sym->initializer);
1447 __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1448 } else {
1449 fake_element_assigns_helper(symbol_expression(sym), NULL, call_global_assign_hooks);
1450 }
1451 } else if (get_real_base_type(sym)->type == SYM_STRUCT) {
1452 if (sym->initializer && sym->initializer->type == EXPR_INITIALIZER) {
1453 fake_member_assigns(sym, call_global_assign_hooks);
1454 } else if (sym->initializer) {
1455 symbol = symbol_expression(sym);
1456 assign = assign_expression(symbol, sym->initializer);
1457 __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1458 } else {
1459 fake_member_assigns_helper(symbol_expression(sym), NULL, call_global_assign_hooks);
1460 }
1461 } else {
1462 symbol = symbol_expression(sym);
1463 if (sym->initializer)
1464 assign = assign_expression(symbol, sym->initializer);
1465 else
1466 assign = assign_expression(symbol, zero_expr());
1467 __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1468 }
1469 }
1470
1471 static void start_function_definition(struct symbol *sym)
1472 {
1473 __in_function_def = 1;
1474 __pass_to_client(sym, FUNC_DEF_HOOK);
1475 __in_function_def = 0;
1476 __pass_to_client(sym, AFTER_DEF_HOOK);
1477
1478 }
1479
1480 static void split_function(struct symbol *sym)
1481 {
1482 struct symbol *base_type = get_base_type(sym);
1483
1484 if (!base_type->stmt && !base_type->inline_stmt)
1485 return;
1486
1487 gettimeofday(&fn_start_time, NULL);
1488 cur_func_sym = sym;
1489 if (sym->ident)
1490 cur_func = sym->ident->name;
1491 set_position(sym->pos);
1492 loop_count = 0;
1493 last_goto_statement_handled = 0;
1494 sm_debug("new function: %s\n", cur_func);
1495 __stree_id = 0;
1496 if (option_two_passes) {
1497 __unnullify_path();
1498 loop_num = 0;
1499 final_pass = 0;
1500 start_function_definition(sym);
1501 __split_stmt(base_type->stmt);
1502 __split_stmt(base_type->inline_stmt);
1503 nullify_path();
1504 }
1505 __unnullify_path();
1506 loop_num = 0;
1507 final_pass = 1;
1508 start_function_definition(sym);
1509 __split_stmt(base_type->stmt);
1510 __split_stmt(base_type->inline_stmt);
1511 __pass_to_client(sym, END_FUNC_HOOK);
1512 if (need_delayed_scope_hooks())
1513 __call_scope_hooks();
1514 __pass_to_client(sym, AFTER_FUNC_HOOK);
1515
1516 clear_all_states();
1517 cur_func_sym = NULL;
1518 cur_func = NULL;
1519 free_data_info_allocs();
1520 free_expression_stack(&switch_expr_stack);
1521 __free_ptr_list((struct ptr_list **)&big_statement_stack);
1522 __bail_on_rest_of_function = 0;
1523 }
1524
1525 static void parse_inline(struct expression *call)
1526 {
1527 struct symbol *base_type;
1528 int loop_num_bak = loop_num;
1529 int loop_count_bak = loop_count;
1530 int final_pass_bak = final_pass;
1531 char *cur_func_bak = cur_func;
1532 struct statement_list *big_statement_stack_bak = big_statement_stack;
1533 struct expression_list *big_expression_stack_bak = big_expression_stack;
1534 struct expression_list *big_condition_stack_bak = big_condition_stack;
1535 struct expression_list *switch_expr_stack_bak = switch_expr_stack;
1536 struct symbol *cur_func_sym_bak = cur_func_sym;
1537
1538 __pass_to_client(call, INLINE_FN_START);
1539 final_pass = 0; /* don't print anything */
1540 __inline_fn = call;
1541
1542 base_type = get_base_type(call->fn->symbol);
1543 cur_func_sym = call->fn->symbol;
1544 if (call->fn->symbol->ident)
1545 cur_func = call->fn->symbol->ident->name;
1546 else
1547 cur_func = NULL;
1548 set_position(call->fn->symbol->pos);
1549
1550 save_all_states();
1551 big_statement_stack = NULL;
1552 big_expression_stack = NULL;
1553 big_condition_stack = NULL;
1554 switch_expr_stack = NULL;
1555
1556 sm_debug("inline function: %s\n", cur_func);
1557 __unnullify_path();
1558 loop_num = 0;
1559 start_function_definition(call->fn->symbol);
1560 __split_stmt(base_type->stmt);
1561 __split_stmt(base_type->inline_stmt);
1562 __pass_to_client(call->fn->symbol, END_FUNC_HOOK);
1563 __pass_to_client(call->fn->symbol, AFTER_FUNC_HOOK);
1564
1565 free_expression_stack(&switch_expr_stack);
1566 __free_ptr_list((struct ptr_list **)&big_statement_stack);
1567 nullify_path();
1568 free_goto_stack();
1569
1570 loop_num = loop_num_bak;
1571 loop_count = loop_count_bak;
1572 final_pass = final_pass_bak;
1573 cur_func_sym = cur_func_sym_bak;
1574 cur_func = cur_func_bak;
1575 big_statement_stack = big_statement_stack_bak;
1576 big_expression_stack = big_expression_stack_bak;
1577 big_condition_stack = big_condition_stack_bak;
1578 switch_expr_stack = switch_expr_stack_bak;
1579
1580 restore_all_states();
1581 set_position(call->pos);
1582 __inline_fn = NULL;
1583 __pass_to_client(call, INLINE_FN_END);
1584 }
1585
1586 static struct symbol_list *inlines_called;
1587 static void add_inline_function(struct symbol *sym)
1588 {
1589 static struct symbol_list *already_added;
1590 struct symbol *tmp;
1591
1592 FOR_EACH_PTR(already_added, tmp) {
1593 if (tmp == sym)
1594 return;
1595 } END_FOR_EACH_PTR(tmp);
1596
1597 add_ptr_list(&already_added, sym);
1598 add_ptr_list(&inlines_called, sym);
1599 }
1600
1601 static void process_inlines(void)
1602 {
1603 struct symbol *tmp;
1604
1605 FOR_EACH_PTR(inlines_called, tmp) {
1606 split_function(tmp);
1607 } END_FOR_EACH_PTR(tmp);
1608 free_ptr_list(&inlines_called);
1609 }
1610
1611 static struct symbol *get_last_scoped_symbol(struct symbol_list *big_list, int use_static)
1612 {
1613 struct symbol *sym;
1614
1615 FOR_EACH_PTR_REVERSE(big_list, sym) {
1616 if (!sym->scope)
1617 continue;
1618 if (use_static && sym->ctype.modifiers & MOD_STATIC)
1619 return sym;
1620 if (!use_static && !(sym->ctype.modifiers & MOD_STATIC))
1621 return sym;
1622 } END_FOR_EACH_PTR_REVERSE(sym);
1623
1624 return NULL;
1625 }
1626
1627 static void split_inlines_in_scope(struct symbol *sym)
1628 {
1629 struct symbol *base;
1630 struct symbol_list *scope_list;
1631 int stream;
1632
1633 scope_list = sym->scope->symbols;
1634 stream = sym->pos.stream;
1635
1636 /* find the last static symbol in the file */
1637 FOR_EACH_PTR_REVERSE(scope_list, sym) {
1638 if (sym->pos.stream != stream)
1639 continue;
1640 if (sym->type != SYM_NODE)
1641 continue;
1642 base = get_base_type(sym);
1643 if (!base)
1644 continue;
1645 if (base->type != SYM_FN)
1646 continue;
1647 if (!base->inline_stmt)
1648 continue;
1649 add_inline_function(sym);
1650 } END_FOR_EACH_PTR_REVERSE(sym);
1651
1652 process_inlines();
1653 }
1654
1655 static void split_inlines(struct symbol_list *sym_list)
1656 {
1657 struct symbol *sym;
1658
1659 sym = get_last_scoped_symbol(sym_list, 0);
1660 if (sym)
1661 split_inlines_in_scope(sym);
1662 sym = get_last_scoped_symbol(sym_list, 1);
1663 if (sym)
1664 split_inlines_in_scope(sym);
1665 }
1666
1667 static struct stree *clone_estates_perm(struct stree *orig)
1668 {
1669 struct stree *ret = NULL;
1670 struct sm_state *tmp;
1671
1672 FOR_EACH_SM(orig, tmp) {
1673 set_state_stree_perm(&ret, tmp->owner, tmp->name, tmp->sym, clone_estate_perm(tmp->state));
1674 } END_FOR_EACH_SM(tmp);
1675
1676 return ret;
1677 }
1678
1679 struct position last_pos;
1680 static void split_functions(struct symbol_list *sym_list)
1681 {
1682 struct symbol *sym;
1683
1684 __unnullify_path();
1685 FOR_EACH_PTR(sym_list, sym) {
1686 set_position(sym->pos);
1687 if (sym->type != SYM_NODE || get_base_type(sym)->type != SYM_FN) {
1688 __pass_to_client(sym, BASE_HOOK);
1689 fake_global_assign(sym);
1690 }
1691 } END_FOR_EACH_PTR(sym);
1692 global_states = clone_estates_perm(get_all_states_stree(SMATCH_EXTRA));
1693 nullify_path();
1694
1695 FOR_EACH_PTR(sym_list, sym) {
1696 set_position(sym->pos);
1697 if (sym->type == SYM_NODE && get_base_type(sym)->type == SYM_FN) {
1698 split_function(sym);
1699 process_inlines();
1700 }
1701 last_pos = sym->pos;
1702 } END_FOR_EACH_PTR(sym);
1703 split_inlines(sym_list);
1704 __pass_to_client(sym_list, END_FILE_HOOK);
1705 }
1706
1707 void smatch(int argc, char **argv)
1708 {
1709 struct string_list *filelist = NULL;
1710 struct symbol_list *sym_list;
1711 struct timeval stop, start;
1712
1713 gettimeofday(&start, NULL);
1714
1715 if (argc < 2) {
1716 printf("Usage: smatch [--debug] <filename.c>\n");
1717 exit(1);
1718 }
1719 sparse_initialize(argc, argv, &filelist);
1720 set_valid_ptr_max();
1721 FOR_EACH_PTR_NOTAG(filelist, base_file) {
1722 if (option_file_output) {
1723 char buf[256];
1724
1725 snprintf(buf, sizeof(buf), "%s.smatch", base_file);
1726 sm_outfd = fopen(buf, "w");
1727 if (!sm_outfd) {
1728 printf("Error: Cannot open %s\n", base_file);
1729 exit(1);
1730 }
1731 }
1732 sym_list = sparse_keep_tokens(base_file);
1733 split_functions(sym_list);
1734 } END_FOR_EACH_PTR_NOTAG(base_file);
1735
1736 gettimeofday(&stop, NULL);
1737
1738 set_position(last_pos);
1739 if (option_time)
1740 sm_msg("time: %lu", stop.tv_sec - start.tv_sec);
1741 }
Static analysis for C