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validation/sm_implied8.c: update test
[smatch.git] / smatch_flow.c
blob235f2fb41c87873658a1fbcb28dca7d657219df8
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 static int prev_expression_is_getting_address(struct expression *expr)
254 {
255 struct expression *parent;
256
257 do {
258 parent = expr->parent;
259
260 if (!parent)
261 return 0;
262 if (parent->type == EXPR_PREOP && parent->op == '&')
263 return 1;
264 if (parent->type == EXPR_PREOP && parent->op == '(')
265 goto next;
266 if (parent->type == EXPR_DEREF && parent->op == '.')
267 goto next;
268
269 return 0;
270 next:
271 expr = parent;
272 } while (1);
273 }
274
275 void __split_expr(struct expression *expr)
276 {
277 if (!expr)
278 return;
279
280 // sm_msg(" Debug expr_type %d %s", expr->type, show_special(expr->op));
281
282 if (__in_fake_assign && expr->type != EXPR_ASSIGNMENT)
283 return;
284 if (__in_fake_assign >= 4) /* don't allow too much nesting */
285 return;
286
287 push_expression(&big_expression_stack, expr);
288 set_position(expr->pos);
289 __pass_to_client(expr, EXPR_HOOK);
290
291 switch (expr->type) {
292 case EXPR_PREOP:
293 set_parent_expr(expr->unop, expr);
294
295 if (expr->op == '*' &&
296 !prev_expression_is_getting_address(expr))
297 __pass_to_client(expr, DEREF_HOOK);
298 __split_expr(expr->unop);
299 __pass_to_client(expr, OP_HOOK);
300 break;
301 case EXPR_POSTOP:
302 set_parent_expr(expr->unop, expr);
303
304 __split_expr(expr->unop);
305 push_expression(&post_op_stack, expr);
306 break;
307 case EXPR_STATEMENT:
308 __expr_stmt_count++;
309 __split_stmt(expr->statement);
310 __expr_stmt_count--;
311 break;
312 case EXPR_LOGICAL:
313 case EXPR_COMPARE:
314 set_parent_expr(expr->left, expr);
315 set_parent_expr(expr->right, expr);
316
317 __pass_to_client(expr, LOGIC_HOOK);
318 __handle_logic(expr);
319 break;
320 case EXPR_BINOP:
321 set_parent_expr(expr->left, expr);
322 set_parent_expr(expr->right, expr);
323
324 __pass_to_client(expr, BINOP_HOOK);
325 case EXPR_COMMA:
326 set_parent_expr(expr->left, expr);
327 set_parent_expr(expr->right, expr);
328
329 __split_expr(expr->left);
330 __process_post_op_stack();
331 __split_expr(expr->right);
332 break;
333 case EXPR_ASSIGNMENT: {
334 struct expression *tmp;
335
336 set_parent_expr(expr->left, expr);
337 set_parent_expr(expr->right, expr);
338
339 if (!expr->right)
340 break;
341
342 __pass_to_client(expr, RAW_ASSIGNMENT_HOOK);
343
344 /* foo = !bar() */
345 if (__handle_condition_assigns(expr))
346 break;
347 /* foo = (x < 5 ? foo : 5); */
348 if (__handle_select_assigns(expr))
349 break;
350 /* foo = ({frob(); frob(); frob(); 1;}) */
351 if (__handle_expr_statement_assigns(expr))
352 break;
353 /* foo = (3, 4); */
354 if (handle_comma_assigns(expr))
355 break;
356
357 __split_expr(expr->right);
358 if (outside_of_function())
359 __pass_to_client(expr, GLOBAL_ASSIGNMENT_HOOK);
360 else
361 __pass_to_client(expr, ASSIGNMENT_HOOK);
362
363 __fake_struct_member_assignments(expr);
364
365 tmp = strip_expr(expr->right);
366 if (expr->op == '=' && tmp->type == EXPR_CALL) {
367 __pass_to_client(expr, CALL_ASSIGNMENT_HOOK);
368 if (!is_fake_call(tmp))
369 __pass_to_client(tmp, FUNCTION_CALL_HOOK_AFTER);
370 }
371 if (get_macro_name(tmp->pos) &&
372 get_macro_name(expr->pos) != get_macro_name(tmp->pos))
373 __pass_to_client(expr, MACRO_ASSIGNMENT_HOOK);
374 __split_expr(expr->left);
375 break;
376 }
377 case EXPR_DEREF:
378 set_parent_expr(expr->deref, expr);
379
380 __pass_to_client(expr, DEREF_HOOK);
381 __split_expr(expr->deref);
382 break;
383 case EXPR_SLICE:
384 set_parent_expr(expr->base, expr);
385
386 __split_expr(expr->base);
387 break;
388 case EXPR_CAST:
389 case EXPR_FORCE_CAST:
390 set_parent_expr(expr->cast_expression, expr);
391
392 __pass_to_client(expr, CAST_HOOK);
393 __split_expr(expr->cast_expression);
394 break;
395 case EXPR_SIZEOF:
396 if (expr->cast_expression)
397 __pass_to_client(strip_parens(expr->cast_expression),
398 SIZEOF_HOOK);
399 break;
400 case EXPR_OFFSETOF:
401 case EXPR_ALIGNOF:
402 evaluate_expression(expr);
403 break;
404 case EXPR_CONDITIONAL:
405 case EXPR_SELECT:
406 set_parent_expr(expr->conditional, expr);
407 set_parent_expr(expr->cond_true, expr);
408 set_parent_expr(expr->cond_false, expr);
409
410 if (known_condition_true(expr->conditional)) {
411 __split_expr(expr->cond_true);
412 break;
413 }
414 if (known_condition_false(expr->conditional)) {
415 __split_expr(expr->cond_false);
416 break;
417 }
418 __pass_to_client(expr, SELECT_HOOK);
419 __split_whole_condition(expr->conditional);
420 __split_expr(expr->cond_true);
421 __push_true_states();
422 __use_false_states();
423 __split_expr(expr->cond_false);
424 __merge_true_states();
425 break;
426 case EXPR_CALL:
427 set_parent_expr(expr->fn, expr);
428
429 if (sym_name_is("__builtin_constant_p", expr->fn))
430 break;
431 split_expr_list(expr->args, expr);
432 __split_expr(expr->fn);
433 if (is_inline_func(expr->fn))
434 add_inline_function(expr->fn->symbol);
435 if (inlinable(expr->fn))
436 __inline_call = 1;
437 __process_post_op_stack();
438 __pass_to_client(expr, FUNCTION_CALL_HOOK);
439 __inline_call = 0;
440 if (inlinable(expr->fn)) {
441 parse_inline(expr);
442 }
443 __pass_to_client(expr, CALL_HOOK_AFTER_INLINE);
444 if (!is_assigned_call(expr))
445 __pass_to_client(expr, FUNCTION_CALL_HOOK_AFTER);
446 if (is_noreturn_func(expr->fn))
447 nullify_path();
448 break;
449 case EXPR_INITIALIZER:
450 split_expr_list(expr->expr_list, expr);
451 break;
452 case EXPR_IDENTIFIER:
453 set_parent_expr(expr->ident_expression, expr);
454 __split_expr(expr->ident_expression);
455 break;
456 case EXPR_INDEX:
457 set_parent_expr(expr->idx_expression, expr);
458 __split_expr(expr->idx_expression);
459 break;
460 case EXPR_POS:
461 set_parent_expr(expr->init_expr, expr);
462 __split_expr(expr->init_expr);
463 break;
464 case EXPR_SYMBOL:
465 __pass_to_client(expr, SYM_HOOK);
466 break;
467 case EXPR_STRING:
468 __pass_to_client(expr, STRING_HOOK);
469 break;
470 default:
471 break;
472 };
473 pop_expression(&big_expression_stack);
474 }
475
476 static int is_forever_loop(struct statement *stmt)
477 {
478 struct expression *expr;
479
480 expr = strip_expr(stmt->iterator_pre_condition);
481 if (!expr)
482 expr = stmt->iterator_post_condition;
483 if (!expr) {
484 /* this is a for(;;) loop... */
485 return 1;
486 }
487
488 if (expr->type == EXPR_VALUE && expr->value == 1)
489 return 1;
490
491 return 0;
492 }
493
494 static int loop_num;
495 static char *get_loop_name(int num)
496 {
497 char buf[256];
498
499 snprintf(buf, 255, "-loop%d", num);
500 buf[255] = '\0';
501 return alloc_sname(buf);
502 }
503
504 /*
505 * Pre Loops are while and for loops.
506 */
507 static void handle_pre_loop(struct statement *stmt)
508 {
509 int once_through; /* we go through the loop at least once */
510 struct sm_state *extra_sm = NULL;
511 int unchanged = 0;
512 char *loop_name;
513 struct stree *stree = NULL;
514 struct sm_state *sm = NULL;
515
516 loop_name = get_loop_name(loop_num);
517 loop_num++;
518
519 __split_stmt(stmt->iterator_pre_statement);
520 __prev_stmt = stmt->iterator_pre_statement;
521
522 once_through = implied_condition_true(stmt->iterator_pre_condition);
523
524 loop_count++;
525 __push_continues();
526 __push_breaks();
527
528 __merge_gotos(loop_name);
529
530 extra_sm = __extra_handle_canonical_loops(stmt, &stree);
531 __in_pre_condition++;
532 __pass_to_client(stmt, PRELOOP_HOOK);
533 __split_whole_condition(stmt->iterator_pre_condition);
534 __in_pre_condition--;
535 FOR_EACH_SM(stree, sm) {
536 set_state(sm->owner, sm->name, sm->sym, sm->state);
537 } END_FOR_EACH_SM(sm);
538 free_stree(&stree);
539 if (extra_sm)
540 extra_sm = get_sm_state(extra_sm->owner, extra_sm->name, extra_sm->sym);
541
542 if (option_assume_loops)
543 once_through = 1;
544
545 __split_stmt(stmt->iterator_statement);
546 if (is_forever_loop(stmt)) {
547 __merge_continues();
548 __save_gotos(loop_name);
549
550 __push_fake_cur_stree();
551 __split_stmt(stmt->iterator_post_statement);
552 stree = __pop_fake_cur_stree();
553
554 __discard_false_states();
555 __use_breaks();
556
557 if (!__path_is_null())
558 __merge_stree_into_cur(stree);
559 free_stree(&stree);
560 } else {
561 __merge_continues();
562 unchanged = __iterator_unchanged(extra_sm);
563 __split_stmt(stmt->iterator_post_statement);
564 __prev_stmt = stmt->iterator_post_statement;
565 __cur_stmt = stmt;
566
567 __save_gotos(loop_name);
568 __in_pre_condition++;
569 __split_whole_condition(stmt->iterator_pre_condition);
570 __in_pre_condition--;
571 nullify_path();
572 __merge_false_states();
573 if (once_through)
574 __discard_false_states();
575 else
576 __merge_false_states();
577
578 if (extra_sm && unchanged)
579 __extra_pre_loop_hook_after(extra_sm,
580 stmt->iterator_post_statement,
581 stmt->iterator_pre_condition);
582 __merge_breaks();
583 }
584 loop_count--;
585 }
586
587 /*
588 * Post loops are do {} while();
589 */
590 static void handle_post_loop(struct statement *stmt)
591 {
592 char *loop_name;
593
594 loop_name = get_loop_name(loop_num);
595 loop_num++;
596 loop_count++;
597
598 __push_continues();
599 __push_breaks();
600 __merge_gotos(loop_name);
601 __split_stmt(stmt->iterator_statement);
602 __merge_continues();
603 if (!is_zero(stmt->iterator_post_condition))
604 __save_gotos(loop_name);
605
606 if (is_forever_loop(stmt)) {
607 __use_breaks();
608 } else {
609 __split_whole_condition(stmt->iterator_post_condition);
610 __use_false_states();
611 __merge_breaks();
612 }
613 loop_count--;
614 }
615
616 static int empty_statement(struct statement *stmt)
617 {
618 if (!stmt)
619 return 0;
620 if (stmt->type == STMT_EXPRESSION && !stmt->expression)
621 return 1;
622 return 0;
623 }
624
625 static int last_stmt_on_same_line(void)
626 {
627 struct statement *stmt;
628 int i = 0;
629
630 FOR_EACH_PTR_REVERSE(big_statement_stack, stmt) {
631 if (!i++)
632 continue;
633 if (stmt->pos.line == get_lineno())
634 return 1;
635 return 0;
636 } END_FOR_EACH_PTR_REVERSE(stmt);
637 return 0;
638 }
639
640 static void split_asm_constraints(struct expression_list *expr_list)
641 {
642 struct expression *expr;
643 int state = 0;
644
645 FOR_EACH_PTR(expr_list, expr) {
646 switch (state) {
647 case 0: /* identifier */
648 case 1: /* constraint */
649 state++;
650 continue;
651 case 2: /* expression */
652 state = 0;
653 __split_expr(expr);
654 continue;
655 }
656 } END_FOR_EACH_PTR(expr);
657 }
658
659 static int is_case_val(struct statement *stmt, sval_t sval)
660 {
661 sval_t case_sval;
662
663 if (stmt->type != STMT_CASE)
664 return 0;
665 if (!stmt->case_expression) {
666 __set_default();
667 return 1;
668 }
669 if (!get_value(stmt->case_expression, &case_sval))
670 return 0;
671 if (case_sval.value == sval.value)
672 return 1;
673 return 0;
674 }
675
676 static void split_known_switch(struct statement *stmt, sval_t sval)
677 {
678 struct statement *tmp;
679
680 __split_expr(stmt->switch_expression);
681
682 push_expression(&switch_expr_stack, stmt->switch_expression);
683 __save_switch_states(top_expression(switch_expr_stack));
684 nullify_path();
685 __push_default();
686 __push_breaks();
687
688 stmt = stmt->switch_statement;
689
690 __push_scope_hooks();
691 FOR_EACH_PTR(stmt->stmts, tmp) {
692 __smatch_lineno = tmp->pos.line;
693 if (is_case_val(tmp, sval)) {
694 __merge_switches(top_expression(switch_expr_stack),
695 stmt->case_expression, stmt->case_to);
696 __pass_case_to_client(top_expression(switch_expr_stack),
697 stmt->case_expression);
698 }
699 if (__path_is_null())
700 continue;
701 __split_stmt(tmp);
702 if (__path_is_null()) {
703 __set_default();
704 goto out;
705 }
706 } END_FOR_EACH_PTR(tmp);
707 out:
708 __call_scope_hooks();
709 if (!__pop_default())
710 __merge_switches(top_expression(switch_expr_stack),
711 NULL, NULL);
712 __discard_switches();
713 __merge_breaks();
714 pop_expression(&switch_expr_stack);
715 }
716
717 static int taking_too_long(void)
718 {
719 int ms;
720
721 ms = ms_since(&fn_start_time);
722 if (ms > 1000 * 60 * 5) /* five minutes */
723 return 1;
724 return 0;
725 }
726
727 static int is_last_stmt(struct statement *cur_stmt)
728 {
729 struct symbol *fn = get_base_type(cur_func_sym);
730 struct statement *stmt;
731
732 if (!fn)
733 return 0;
734 stmt = fn->stmt;
735 if (!stmt)
736 stmt = fn->inline_stmt;
737 if (!stmt || stmt->type != STMT_COMPOUND)
738 return 0;
739 stmt = last_ptr_list((struct ptr_list *)stmt->stmts);
740 if (stmt && stmt->type == STMT_LABEL)
741 stmt = stmt->label_statement;
742 if (stmt == cur_stmt)
743 return 1;
744 return 0;
745 }
746
747 static void handle_backward_goto(struct statement *goto_stmt)
748 {
749 const char *goto_name, *label_name;
750 struct statement *func_stmt;
751 struct symbol *base_type = get_base_type(cur_func_sym);
752 struct statement *tmp;
753 int found = 0;
754
755 if (!option_info)
756 return;
757 if (last_goto_statement_handled)
758 return;
759 last_goto_statement_handled = 1;
760
761 if (!goto_stmt->goto_label ||
762 goto_stmt->goto_label->type != SYM_LABEL ||
763 !goto_stmt->goto_label->ident)
764 return;
765 goto_name = goto_stmt->goto_label->ident->name;
766
767 func_stmt = base_type->stmt;
768 if (!func_stmt)
769 func_stmt = base_type->inline_stmt;
770 if (!func_stmt)
771 return;
772 if (func_stmt->type != STMT_COMPOUND)
773 return;
774
775 FOR_EACH_PTR(func_stmt->stmts, tmp) {
776 if (!found) {
777 if (tmp->type != STMT_LABEL)
778 continue;
779 if (!tmp->label_identifier ||
780 tmp->label_identifier->type != SYM_LABEL ||
781 !tmp->label_identifier->ident)
782 continue;
783 label_name = tmp->label_identifier->ident->name;
784 if (strcmp(goto_name, label_name) != 0)
785 continue;
786 found = 1;
787 }
788 __split_stmt(tmp);
789 } END_FOR_EACH_PTR(tmp);
790 }
791
792 static void fake_a_return(void)
793 {
794 struct symbol *return_type;
795
796 nullify_path();
797 __unnullify_path();
798
799 return_type = get_real_base_type(cur_func_sym);
800 return_type = get_real_base_type(return_type);
801 if (return_type != &void_ctype) {
802 __pass_to_client(unknown_value_expression(NULL), RETURN_HOOK);
803 nullify_path();
804 }
805 }
806
807 static void split_compound(struct statement *stmt)
808 {
809 struct statement *prev = NULL;
810 struct statement *cur = NULL;
811 struct statement *next;
812
813 __push_scope_hooks();
814
815 FOR_EACH_PTR(stmt->stmts, next) {
816 /* just set them all ahead of time */
817 set_parent_stmt(next, stmt);
818
819 if (cur) {
820 __prev_stmt = prev;
821 __next_stmt = next;
822 __cur_stmt = cur;
823 __split_stmt(cur);
824 }
825 prev = cur;
826 cur = next;
827 } END_FOR_EACH_PTR(next);
828 if (cur) {
829 __prev_stmt = prev;
830 __cur_stmt = cur;
831 __next_stmt = NULL;
832 __split_stmt(cur);
833 }
834
835 __call_scope_hooks();
836 }
837
838 void __split_stmt(struct statement *stmt)
839 {
840 sval_t sval;
841
842 if (!stmt)
843 goto out;
844
845 if (__bail_on_rest_of_function)
846 return;
847
848 if (out_of_memory() || taking_too_long()) {
849
850 __bail_on_rest_of_function = 1;
851 sm_msg("Function too hairy. Giving up.");
852 fake_a_return();
853 final_pass = 0; /* turn off sm_msg() from here */
854 return;
855 }
856
857 add_ptr_list(&big_statement_stack, stmt);
858 free_expression_stack(&big_expression_stack);
859 set_position(stmt->pos);
860 __pass_to_client(stmt, STMT_HOOK);
861
862 switch (stmt->type) {
863 case STMT_DECLARATION:
864 split_declaration(stmt->declaration);
865 break;
866 case STMT_RETURN:
867 __split_expr(stmt->ret_value);
868 __pass_to_client(stmt->ret_value, RETURN_HOOK);
869 __process_post_op_stack();
870 nullify_path();
871 break;
872 case STMT_EXPRESSION:
873 __split_expr(stmt->expression);
874 break;
875 case STMT_COMPOUND:
876 split_compound(stmt);
877 break;
878 case STMT_IF:
879 set_parent_stmt(stmt->if_true, stmt);
880 set_parent_stmt(stmt->if_false, stmt);
881
882 if (known_condition_true(stmt->if_conditional)) {
883 __split_stmt(stmt->if_true);
884 break;
885 }
886 if (known_condition_false(stmt->if_conditional)) {
887 __split_stmt(stmt->if_false);
888 break;
889 }
890 __split_whole_condition(stmt->if_conditional);
891 __split_stmt(stmt->if_true);
892 if (empty_statement(stmt->if_true) &&
893 last_stmt_on_same_line() &&
894 !get_macro_name(stmt->if_true->pos))
895 sm_msg("warn: if();");
896 __push_true_states();
897 __use_false_states();
898 __split_stmt(stmt->if_false);
899 __merge_true_states();
900 break;
901 case STMT_ITERATOR:
902 set_parent_stmt(stmt->iterator_pre_statement, stmt);
903 set_parent_stmt(stmt->iterator_statement, stmt);
904 set_parent_stmt(stmt->iterator_post_statement, stmt);
905
906 if (stmt->iterator_pre_condition)
907 handle_pre_loop(stmt);
908 else if (stmt->iterator_post_condition)
909 handle_post_loop(stmt);
910 else {
911 // these are for(;;) type loops.
912 handle_pre_loop(stmt);
913 }
914 break;
915 case STMT_SWITCH:
916 set_parent_stmt(stmt->switch_statement, stmt);
917
918 if (get_value(stmt->switch_expression, &sval)) {
919 split_known_switch(stmt, sval);
920 break;
921 }
922 __split_expr(stmt->switch_expression);
923 push_expression(&switch_expr_stack, stmt->switch_expression);
924 __save_switch_states(top_expression(switch_expr_stack));
925 nullify_path();
926 __push_default();
927 __push_breaks();
928 __split_stmt(stmt->switch_statement);
929 if (!__pop_default())
930 __merge_switches(top_expression(switch_expr_stack),
931 NULL, NULL);
932 __discard_switches();
933 __merge_breaks();
934 pop_expression(&switch_expr_stack);
935 break;
936 case STMT_CASE:
937 __merge_switches(top_expression(switch_expr_stack),
938 stmt->case_expression, stmt->case_to);
939 __pass_case_to_client(top_expression(switch_expr_stack),
940 stmt->case_expression);
941 if (!stmt->case_expression)
942 __set_default();
943 __split_expr(stmt->case_expression);
944 __split_expr(stmt->case_to);
945 __split_stmt(stmt->case_statement);
946 break;
947 case STMT_LABEL:
948 if (stmt->label_identifier &&
949 stmt->label_identifier->type == SYM_LABEL &&
950 stmt->label_identifier->ident) {
951 loop_count |= 0x80000000;
952 __merge_gotos(stmt->label_identifier->ident->name);
953 }
954 __split_stmt(stmt->label_statement);
955 break;
956 case STMT_GOTO:
957 __split_expr(stmt->goto_expression);
958 if (stmt->goto_label && stmt->goto_label->type == SYM_NODE) {
959 if (!strcmp(stmt->goto_label->ident->name, "break")) {
960 __process_breaks();
961 } else if (!strcmp(stmt->goto_label->ident->name,
962 "continue")) {
963 __process_continues();
964 }
965 } else if (stmt->goto_label &&
966 stmt->goto_label->type == SYM_LABEL &&
967 stmt->goto_label->ident) {
968 __save_gotos(stmt->goto_label->ident->name);
969 }
970 nullify_path();
971 if (is_last_stmt(stmt))
972 handle_backward_goto(stmt);
973 break;
974 case STMT_NONE:
975 break;
976 case STMT_ASM:
977 __pass_to_client(stmt, ASM_HOOK);
978 __split_expr(stmt->asm_string);
979 split_asm_constraints(stmt->asm_outputs);
980 split_asm_constraints(stmt->asm_inputs);
981 split_asm_constraints(stmt->asm_clobbers);
982 break;
983 case STMT_CONTEXT:
984 break;
985 case STMT_RANGE:
986 __split_expr(stmt->range_expression);
987 __split_expr(stmt->range_low);
988 __split_expr(stmt->range_high);
989 break;
990 }
991 __pass_to_client(stmt, STMT_HOOK_AFTER);
992 out:
993 __process_post_op_stack();
994 }
995
996 static void split_expr_list(struct expression_list *expr_list, struct expression *parent)
997 {
998 struct expression *expr;
999
1000 FOR_EACH_PTR(expr_list, expr) {
1001 set_parent_expr(expr, parent);
1002 __split_expr(expr);
1003 __process_post_op_stack();
1004 } END_FOR_EACH_PTR(expr);
1005 }
1006
1007 static void split_sym(struct symbol *sym)
1008 {
1009 if (!sym)
1010 return;
1011 if (!(sym->namespace & NS_SYMBOL))
1012 return;
1013
1014 __split_stmt(sym->stmt);
1015 __split_expr(sym->array_size);
1016 split_symlist(sym->arguments);
1017 split_symlist(sym->symbol_list);
1018 __split_stmt(sym->inline_stmt);
1019 split_symlist(sym->inline_symbol_list);
1020 }
1021
1022 static void split_symlist(struct symbol_list *sym_list)
1023 {
1024 struct symbol *sym;
1025
1026 FOR_EACH_PTR(sym_list, sym) {
1027 split_sym(sym);
1028 } END_FOR_EACH_PTR(sym);
1029 }
1030
1031 typedef void (fake_cb)(struct expression *expr);
1032
1033 static int member_to_number(struct expression *expr, struct ident *member)
1034 {
1035 struct symbol *type, *tmp;
1036 char *name;
1037 int i;
1038
1039 if (!member)
1040 return -1;
1041 name = member->name;
1042
1043 type = get_type(expr);
1044 if (!type || type->type != SYM_STRUCT)
1045 return -1;
1046
1047 i = -1;
1048 FOR_EACH_PTR(type->symbol_list, tmp) {
1049 i++;
1050 if (!tmp->ident)
1051 continue;
1052 if (strcmp(name, tmp->ident->name) == 0)
1053 return i;
1054 } END_FOR_EACH_PTR(tmp);
1055 return -1;
1056 }
1057
1058 static struct ident *number_to_member(struct expression *expr, int num)
1059 {
1060 struct symbol *type, *member;
1061 int i = 0;
1062
1063 type = get_type(expr);
1064 if (!type || type->type != SYM_STRUCT)
1065 return NULL;
1066
1067 FOR_EACH_PTR(type->symbol_list, member) {
1068 if (i == num)
1069 return member->ident;
1070 i++;
1071 } END_FOR_EACH_PTR(member);
1072 return NULL;
1073 }
1074
1075 static void fake_element_assigns_helper(struct expression *array, struct expression_list *expr_list, fake_cb *fake_cb);
1076
1077 struct member_set {
1078 struct ident *ident;
1079 int set;
1080 };
1081
1082 static struct member_set *alloc_member_set(struct symbol *type)
1083 {
1084 struct member_set *member_set;
1085 struct symbol *member;
1086 int member_count;
1087 int member_idx;
1088
1089 member_count = ptr_list_size((struct ptr_list *)type->symbol_list);
1090 member_set = malloc(member_count * sizeof(*member_set));
1091 member_idx = 0;
1092 FOR_EACH_PTR(type->symbol_list, member) {
1093 member_set[member_idx].ident = member->ident;
1094 member_set[member_idx].set = 0;
1095 member_idx++;
1096 } END_FOR_EACH_PTR(member);
1097
1098 return member_set;
1099 }
1100
1101 static void mark_member_as_set(struct symbol *type, struct member_set *member_set, struct ident *ident)
1102 {
1103 int member_count = ptr_list_size((struct ptr_list *)type->symbol_list);
1104 int i;
1105
1106 for (i = 0; i < member_count; i++) {
1107 if (member_set[i].ident == ident) {
1108 member_set[i].set = 1;
1109 return;
1110 }
1111 }
1112 // crap. this is buggy.
1113 // sm_msg("internal smatch error in initializer %s.%s", type->ident->name, ident->name);
1114 }
1115
1116 static void set_inner_struct_members(struct expression *expr, struct symbol *member)
1117 {
1118 struct expression *edge_member, *assign;
1119 struct symbol *base = get_real_base_type(member);
1120 struct symbol *tmp;
1121
1122 if (member->ident)
1123 expr = member_expression(expr, '.', member->ident);
1124
1125 FOR_EACH_PTR(base->symbol_list, tmp) {
1126 struct symbol *type;
1127
1128 type = get_real_base_type(tmp);
1129 if (!type)
1130 continue;
1131
1132 if (tmp->ident) {
1133 edge_member = member_expression(expr, '.', tmp->ident);
1134 if (get_state_expr(SMATCH_EXTRA, edge_member))
1135 continue;
1136 }
1137
1138 if (type->type == SYM_UNION || type->type == SYM_STRUCT) {
1139 set_inner_struct_members(expr, tmp);
1140 continue;
1141 }
1142
1143 if (!tmp->ident)
1144 continue;
1145
1146 assign = assign_expression(edge_member, zero_expr());
1147 __split_expr(assign);
1148 } END_FOR_EACH_PTR(tmp);
1149
1150
1151 }
1152
1153 static void set_unset_to_zero(struct symbol *type, struct expression *expr)
1154 {
1155 struct symbol *tmp;
1156 struct expression *member = NULL;
1157 struct expression *assign;
1158 int op = '*';
1159
1160 if (expr->type == EXPR_PREOP && expr->op == '&') {
1161 expr = strip_expr(expr->unop);
1162 op = '.';
1163 }
1164
1165 FOR_EACH_PTR(type->symbol_list, tmp) {
1166 type = get_real_base_type(tmp);
1167 if (!type)
1168 continue;
1169
1170 if (tmp->ident) {
1171 member = member_expression(expr, op, tmp->ident);
1172 if (get_state_expr(SMATCH_EXTRA, member))
1173 continue;
1174 }
1175
1176 if (type->type == SYM_UNION || type->type == SYM_STRUCT) {
1177 set_inner_struct_members(expr, tmp);
1178 continue;
1179 }
1180 if (type->type == SYM_ARRAY)
1181 continue;
1182 if (!tmp->ident)
1183 continue;
1184
1185 assign = assign_expression(member, zero_expr());
1186 __split_expr(assign);
1187 } END_FOR_EACH_PTR(tmp);
1188 }
1189
1190 static void fake_member_assigns_helper(struct expression *symbol, struct expression_list *members, fake_cb *fake_cb)
1191 {
1192 struct expression *deref, *assign, *tmp;
1193 struct symbol *struct_type, *type;
1194 struct ident *member;
1195 int member_idx;
1196 struct member_set *member_set;
1197
1198 struct_type = get_type(symbol);
1199 if (!struct_type ||
1200 (struct_type->type != SYM_STRUCT && struct_type->type != SYM_UNION))
1201 return;
1202
1203 member_set = alloc_member_set(struct_type);
1204
1205 member_idx = 0;
1206 FOR_EACH_PTR(members, tmp) {
1207 member = number_to_member(symbol, member_idx);
1208 while (tmp->type == EXPR_IDENTIFIER) {
1209 member = tmp->expr_ident;
1210 member_idx = member_to_number(symbol, member);
1211 tmp = tmp->ident_expression;
1212 }
1213 mark_member_as_set(struct_type, member_set, member);
1214 member_idx++;
1215 deref = member_expression(symbol, '.', member);
1216 if (tmp->type == EXPR_INITIALIZER) {
1217 type = get_type(deref);
1218 if (type && type->type == SYM_ARRAY)
1219 fake_element_assigns_helper(deref, tmp->expr_list, fake_cb);
1220 else
1221 fake_member_assigns_helper(deref, tmp->expr_list, fake_cb);
1222 } else {
1223 assign = assign_expression(deref, tmp);
1224 fake_cb(assign);
1225 }
1226 } END_FOR_EACH_PTR(tmp);
1227
1228 set_unset_to_zero(struct_type, symbol);
1229 }
1230
1231 static void fake_member_assigns(struct symbol *sym, fake_cb *fake_cb)
1232 {
1233 fake_member_assigns_helper(symbol_expression(sym),
1234 sym->initializer->expr_list, fake_cb);
1235 }
1236
1237 static void fake_element_assigns_helper(struct expression *array, struct expression_list *expr_list, fake_cb *fake_cb)
1238 {
1239 struct expression *offset, *binop, *assign, *tmp;
1240 struct symbol *type;
1241 int idx;
1242
1243 if (ptr_list_size((struct ptr_list *)expr_list) > 1000)
1244 return;
1245
1246 idx = 0;
1247 FOR_EACH_PTR(expr_list, tmp) {
1248 if (tmp->type == EXPR_INDEX) {
1249 if (tmp->idx_from != tmp->idx_to)
1250 return;
1251 idx = tmp->idx_from;
1252 if (!tmp->idx_expression)
1253 goto next;
1254 tmp = tmp->idx_expression;
1255 }
1256 offset = value_expr(idx);
1257 binop = array_element_expression(array, offset);
1258 if (tmp->type == EXPR_INITIALIZER) {
1259 type = get_type(binop);
1260 if (type && type->type == SYM_ARRAY)
1261 fake_element_assigns_helper(binop, tmp->expr_list, fake_cb);
1262 else
1263 fake_member_assigns_helper(binop, tmp->expr_list, fake_cb);
1264 } else {
1265 assign = assign_expression(binop, tmp);
1266 fake_cb(assign);
1267 }
1268 next:
1269 idx++;
1270 } END_FOR_EACH_PTR(tmp);
1271 }
1272
1273 static void fake_element_assigns(struct symbol *sym, fake_cb *fake_cb)
1274 {
1275 fake_element_assigns_helper(symbol_expression(sym), sym->initializer->expr_list, fake_cb);
1276 }
1277
1278 static void fake_assign_expr(struct symbol *sym)
1279 {
1280 struct expression *assign, *symbol;
1281
1282 symbol = symbol_expression(sym);
1283 assign = assign_expression(symbol, sym->initializer);
1284 __split_expr(assign);
1285 }
1286
1287 static void call_split_expr(struct expression *expr)
1288 {
1289 __split_expr(expr);
1290 }
1291
1292 static void do_initializer_stuff(struct symbol *sym)
1293 {
1294 if (!sym->initializer)
1295 return;
1296
1297 if (sym->initializer->type == EXPR_INITIALIZER) {
1298 if (get_real_base_type(sym)->type == SYM_ARRAY)
1299 fake_element_assigns(sym, call_split_expr);
1300 else
1301 fake_member_assigns(sym, call_split_expr);
1302 } else {
1303 fake_assign_expr(sym);
1304 }
1305 }
1306
1307 static void split_declaration(struct symbol_list *sym_list)
1308 {
1309 struct symbol *sym;
1310
1311 FOR_EACH_PTR(sym_list, sym) {
1312 __pass_to_client(sym, DECLARATION_HOOK);
1313 do_initializer_stuff(sym);
1314 split_sym(sym);
1315 } END_FOR_EACH_PTR(sym);
1316 }
1317
1318 static void call_global_assign_hooks(struct expression *assign)
1319 {
1320 __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1321 }
1322
1323 static void fake_global_assign(struct symbol *sym)
1324 {
1325 struct expression *assign, *symbol;
1326
1327 if (get_real_base_type(sym)->type == SYM_ARRAY) {
1328 if (sym->initializer && sym->initializer->type == EXPR_INITIALIZER) {
1329 fake_element_assigns(sym, call_global_assign_hooks);
1330 } else if (sym->initializer) {
1331 symbol = symbol_expression(sym);
1332 assign = assign_expression(symbol, sym->initializer);
1333 __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1334 } else {
1335 fake_element_assigns_helper(symbol_expression(sym), NULL, call_global_assign_hooks);
1336 }
1337 } else if (get_real_base_type(sym)->type == SYM_STRUCT) {
1338 if (sym->initializer && sym->initializer->type == EXPR_INITIALIZER) {
1339 fake_member_assigns(sym, call_global_assign_hooks);
1340 } else if (sym->initializer) {
1341 symbol = symbol_expression(sym);
1342 assign = assign_expression(symbol, sym->initializer);
1343 __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1344 } else {
1345 fake_member_assigns_helper(symbol_expression(sym), NULL, call_global_assign_hooks);
1346 }
1347 } else {
1348 symbol = symbol_expression(sym);
1349 if (sym->initializer)
1350 assign = assign_expression(symbol, sym->initializer);
1351 else
1352 assign = assign_expression(symbol, zero_expr());
1353 __pass_to_client(assign, GLOBAL_ASSIGNMENT_HOOK);
1354 }
1355 }
1356
1357 static void start_function_definition(struct symbol *sym)
1358 {
1359 __in_function_def = 1;
1360 __pass_to_client(sym, FUNC_DEF_HOOK);
1361 __in_function_def = 0;
1362 __pass_to_client(sym, AFTER_DEF_HOOK);
1363
1364 }
1365
1366 static void split_function(struct symbol *sym)
1367 {
1368 struct symbol *base_type = get_base_type(sym);
1369
1370 if (!base_type->stmt && !base_type->inline_stmt)
1371 return;
1372
1373 gettimeofday(&fn_start_time, NULL);
1374 cur_func_sym = sym;
1375 if (sym->ident)
1376 cur_func = sym->ident->name;
1377 __smatch_lineno = sym->pos.line;
1378 loop_count = 0;
1379 last_goto_statement_handled = 0;
1380 sm_debug("new function: %s\n", cur_func);
1381 __stree_id = 0;
1382 if (option_two_passes) {
1383 __unnullify_path();
1384 loop_num = 0;
1385 final_pass = 0;
1386 start_function_definition(sym);
1387 __split_stmt(base_type->stmt);
1388 __split_stmt(base_type->inline_stmt);
1389 nullify_path();
1390 }
1391 __unnullify_path();
1392 loop_num = 0;
1393 final_pass = 1;
1394 start_function_definition(sym);
1395 __split_stmt(base_type->stmt);
1396 __split_stmt(base_type->inline_stmt);
1397 __pass_to_client(sym, END_FUNC_HOOK);
1398 __pass_to_client(sym, AFTER_FUNC_HOOK);
1399
1400 clear_all_states();
1401 cur_func_sym = NULL;
1402 cur_func = NULL;
1403 free_data_info_allocs();
1404 free_expression_stack(&switch_expr_stack);
1405 __free_ptr_list((struct ptr_list **)&big_statement_stack);
1406 __bail_on_rest_of_function = 0;
1407 }
1408
1409 static void parse_inline(struct expression *call)
1410 {
1411 struct symbol *base_type;
1412 int loop_num_bak = loop_num;
1413 int final_pass_bak = final_pass;
1414 char *cur_func_bak = cur_func;
1415 struct statement_list *big_statement_stack_bak = big_statement_stack;
1416 struct expression_list *big_expression_stack_bak = big_expression_stack;
1417 struct expression_list *big_condition_stack_bak = big_condition_stack;
1418 struct expression_list *switch_expr_stack_bak = switch_expr_stack;
1419 struct symbol *cur_func_sym_bak = cur_func_sym;
1420
1421 __pass_to_client(call, INLINE_FN_START);
1422 final_pass = 0; /* don't print anything */
1423 __inline_fn = call;
1424
1425 base_type = get_base_type(call->fn->symbol);
1426 cur_func_sym = call->fn->symbol;
1427 if (call->fn->symbol->ident)
1428 cur_func = call->fn->symbol->ident->name;
1429 else
1430 cur_func = NULL;
1431 set_position(call->fn->symbol->pos);
1432
1433 save_all_states();
1434 big_statement_stack = NULL;
1435 big_expression_stack = NULL;
1436 big_condition_stack = NULL;
1437 switch_expr_stack = NULL;
1438
1439 sm_debug("inline function: %s\n", cur_func);
1440 __unnullify_path();
1441 loop_num = 0;
1442 start_function_definition(call->fn->symbol);
1443 __split_stmt(base_type->stmt);
1444 __split_stmt(base_type->inline_stmt);
1445 __pass_to_client(call->fn->symbol, END_FUNC_HOOK);
1446 __pass_to_client(call->fn->symbol, AFTER_FUNC_HOOK);
1447
1448 free_expression_stack(&switch_expr_stack);
1449 __free_ptr_list((struct ptr_list **)&big_statement_stack);
1450 nullify_path();
1451 free_goto_stack();
1452
1453 loop_num = loop_num_bak;
1454 final_pass = final_pass_bak;
1455 cur_func_sym = cur_func_sym_bak;
1456 cur_func = cur_func_bak;
1457 big_statement_stack = big_statement_stack_bak;
1458 big_expression_stack = big_expression_stack_bak;
1459 big_condition_stack = big_condition_stack_bak;
1460 switch_expr_stack = switch_expr_stack_bak;
1461
1462 restore_all_states();
1463 set_position(call->pos);
1464 __inline_fn = NULL;
1465 __pass_to_client(call, INLINE_FN_END);
1466 }
1467
1468 static struct symbol_list *inlines_called;
1469 static void add_inline_function(struct symbol *sym)
1470 {
1471 static struct symbol_list *already_added;
1472 struct symbol *tmp;
1473
1474 FOR_EACH_PTR(already_added, tmp) {
1475 if (tmp == sym)
1476 return;
1477 } END_FOR_EACH_PTR(tmp);
1478
1479 add_ptr_list(&already_added, sym);
1480 add_ptr_list(&inlines_called, sym);
1481 }
1482
1483 static void process_inlines(void)
1484 {
1485 struct symbol *tmp;
1486
1487 FOR_EACH_PTR(inlines_called, tmp) {
1488 split_function(tmp);
1489 } END_FOR_EACH_PTR(tmp);
1490 free_ptr_list(&inlines_called);
1491 }
1492
1493 static struct symbol *get_last_scoped_symbol(struct symbol_list *big_list, int use_static)
1494 {
1495 struct symbol *sym;
1496
1497 FOR_EACH_PTR_REVERSE(big_list, sym) {
1498 if (!sym->scope)
1499 continue;
1500 if (use_static && sym->ctype.modifiers & MOD_STATIC)
1501 return sym;
1502 if (!use_static && !(sym->ctype.modifiers & MOD_STATIC))
1503 return sym;
1504 } END_FOR_EACH_PTR_REVERSE(sym);
1505
1506 return NULL;
1507 }
1508
1509 static void split_inlines_in_scope(struct symbol *sym)
1510 {
1511 struct symbol *base;
1512 struct symbol_list *scope_list;
1513 int stream;
1514
1515 scope_list = sym->scope->symbols;
1516 stream = sym->pos.stream;
1517
1518 /* find the last static symbol in the file */
1519 FOR_EACH_PTR_REVERSE(scope_list, sym) {
1520 if (sym->pos.stream != stream)
1521 continue;
1522 if (sym->type != SYM_NODE)
1523 continue;
1524 base = get_base_type(sym);
1525 if (!base)
1526 continue;
1527 if (base->type != SYM_FN)
1528 continue;
1529 if (!base->inline_stmt)
1530 continue;
1531 add_inline_function(sym);
1532 } END_FOR_EACH_PTR_REVERSE(sym);
1533
1534 process_inlines();
1535 }
1536
1537 static void split_inlines(struct symbol_list *sym_list)
1538 {
1539 struct symbol *sym;
1540
1541 sym = get_last_scoped_symbol(sym_list, 0);
1542 if (sym)
1543 split_inlines_in_scope(sym);
1544 sym = get_last_scoped_symbol(sym_list, 1);
1545 if (sym)
1546 split_inlines_in_scope(sym);
1547 }
1548
1549 static struct stree *clone_estates_perm(struct stree *orig)
1550 {
1551 struct stree *ret = NULL;
1552 struct sm_state *tmp;
1553
1554 FOR_EACH_SM(orig, tmp) {
1555 set_state_stree_perm(&ret, tmp->owner, tmp->name, tmp->sym, clone_estate_perm(tmp->state));
1556 } END_FOR_EACH_SM(tmp);
1557
1558 return ret;
1559 }
1560
1561 static void split_functions(struct symbol_list *sym_list)
1562 {
1563 struct symbol *sym;
1564
1565 __unnullify_path();
1566 FOR_EACH_PTR(sym_list, sym) {
1567 set_position(sym->pos);
1568 if (sym->type != SYM_NODE || get_base_type(sym)->type != SYM_FN) {
1569 __pass_to_client(sym, BASE_HOOK);
1570 fake_global_assign(sym);
1571 }
1572 } END_FOR_EACH_PTR(sym);
1573 global_states = clone_estates_perm(get_all_states_stree(SMATCH_EXTRA));
1574 nullify_path();
1575
1576 FOR_EACH_PTR(sym_list, sym) {
1577 set_position(sym->pos);
1578 if (sym->type == SYM_NODE && get_base_type(sym)->type == SYM_FN) {
1579 split_function(sym);
1580 process_inlines();
1581 }
1582 } END_FOR_EACH_PTR(sym);
1583 split_inlines(sym_list);
1584 __pass_to_client(sym_list, END_FILE_HOOK);
1585 }
1586
1587 void smatch(int argc, char **argv)
1588 {
1589
1590 struct string_list *filelist = NULL;
1591 struct symbol_list *sym_list;
1592
1593 if (argc < 2) {
1594 printf("Usage: smatch [--debug] <filename.c>\n");
1595 exit(1);
1596 }
1597 sparse_initialize(argc, argv, &filelist);
1598 set_valid_ptr_max();
1599 FOR_EACH_PTR_NOTAG(filelist, base_file) {
1600 if (option_file_output) {
1601 char buf[256];
1602
1603 snprintf(buf, sizeof(buf), "%s.smatch", base_file);
1604 sm_outfd = fopen(buf, "w");
1605 if (!sm_outfd) {
1606 printf("Error: Cannot open %s\n", base_file);
1607 exit(1);
1608 }
1609 }
1610 sym_list = sparse_keep_tokens(base_file);
1611 split_functions(sym_list);
1612 } END_FOR_EACH_PTR_NOTAG(base_file);
1613 }
Static analysis for C