2 * Copyright (C) 2009 Dan Carpenter.
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.
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.
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
19 * There are several types of function hooks:
20 * add_function_hook() - For any time a function is called.
21 * add_function_assign_hook() - foo = the_function().
22 * add_implied_return_hook() - Calculates the implied return value.
23 * add_macro_assign_hook() - foo = the_macro().
24 * return_implies_state() - For when a return value of 1 implies locked
25 * and 0 implies unlocked. etc. etc.
32 #include "smatch_slist.h"
33 #include "smatch_extra.h"
34 #include "smatch_function_hashtable.h"
38 struct data_range
*range
;
41 implication_hook
*ranged
;
42 implied_return_hook
*implied_return
;
47 ALLOCATOR(fcall_back
, "call backs");
48 DECLARE_PTR_LIST(call_back_list
, struct fcall_back
);
50 DEFINE_FUNCTION_HASHTABLE_STATIC(callback
, struct fcall_back
, struct call_back_list
);
51 static struct hashtable
*func_hash
;
53 #define REGULAR_CALL 0
56 #define IMPLIED_RETURN 3
57 #define MACRO_ASSIGN 4
58 #define MACRO_ASSIGN_EXTRA 5
60 struct return_implies_callback
{
62 return_implies_hook
*callback
;
64 ALLOCATOR(return_implies_callback
, "return_implies callbacks");
65 DECLARE_PTR_LIST(db_implies_list
, struct return_implies_callback
);
66 static struct db_implies_list
*db_return_states_list
;
68 typedef void (void_fn
)(void);
69 DECLARE_PTR_LIST(void_fn_list
, void_fn
*);
70 static struct void_fn_list
*return_states_before
;
71 static struct void_fn_list
*return_states_after
;
73 static struct fcall_back
*alloc_fcall_back(int type
, void *call_back
,
76 struct fcall_back
*cb
;
78 cb
= __alloc_fcall_back(0);
80 cb
->u
.call_back
= call_back
;
85 void add_function_hook(const char *look_for
, func_hook
*call_back
, void *info
)
87 struct fcall_back
*cb
;
89 cb
= alloc_fcall_back(REGULAR_CALL
, call_back
, info
);
90 add_callback(func_hash
, look_for
, cb
);
93 void add_function_assign_hook(const char *look_for
, func_hook
*call_back
,
96 struct fcall_back
*cb
;
98 cb
= alloc_fcall_back(ASSIGN_CALL
, call_back
, info
);
99 add_callback(func_hash
, look_for
, cb
);
102 void add_implied_return_hook(const char *look_for
,
103 implied_return_hook
*call_back
,
106 struct fcall_back
*cb
;
108 cb
= alloc_fcall_back(IMPLIED_RETURN
, call_back
, info
);
109 add_callback(func_hash
, look_for
, cb
);
112 void add_macro_assign_hook(const char *look_for
, func_hook
*call_back
,
115 struct fcall_back
*cb
;
117 cb
= alloc_fcall_back(MACRO_ASSIGN
, call_back
, info
);
118 add_callback(func_hash
, look_for
, cb
);
121 void add_macro_assign_hook_extra(const char *look_for
, func_hook
*call_back
,
124 struct fcall_back
*cb
;
126 cb
= alloc_fcall_back(MACRO_ASSIGN_EXTRA
, call_back
, info
);
127 add_callback(func_hash
, look_for
, cb
);
130 void return_implies_state(const char *look_for
, long long start
, long long end
,
131 implication_hook
*call_back
, void *info
)
133 struct fcall_back
*cb
;
135 cb
= alloc_fcall_back(RANGED_CALL
, call_back
, info
);
136 cb
->range
= alloc_range_perm(ll_to_sval(start
), ll_to_sval(end
));
137 add_callback(func_hash
, look_for
, cb
);
140 void select_return_states_hook(int type
, return_implies_hook
*callback
)
142 struct return_implies_callback
*cb
= __alloc_return_implies_callback(0);
145 cb
->callback
= callback
;
146 add_ptr_list(&db_return_states_list
, cb
);
149 void select_return_states_before(void_fn
*fn
)
151 void_fn
**p
= malloc(sizeof(void_fn
*));
153 add_ptr_list(&return_states_before
, p
);
156 void select_return_states_after(void_fn
*fn
)
158 void_fn
**p
= malloc(sizeof(void_fn
*));
160 add_ptr_list(&return_states_after
, p
);
163 static void call_return_states_before_hooks(void)
167 FOR_EACH_PTR(return_states_before
, fn
) {
169 } END_FOR_EACH_PTR(fn
);
172 static void call_return_states_after_hooks(void)
176 FOR_EACH_PTR(return_states_after
, fn
) {
178 } END_FOR_EACH_PTR(fn
);
181 static int call_call_backs(struct call_back_list
*list
, int type
,
182 const char *fn
, struct expression
*expr
)
184 struct fcall_back
*tmp
;
187 FOR_EACH_PTR(list
, tmp
) {
188 if (tmp
->type
== type
) {
189 (tmp
->u
.call_back
)(fn
, expr
, tmp
->info
);
192 } END_FOR_EACH_PTR(tmp
);
197 static void call_ranged_call_backs(struct call_back_list
*list
,
198 const char *fn
, struct expression
*call_expr
,
199 struct expression
*assign_expr
)
201 struct fcall_back
*tmp
;
203 FOR_EACH_PTR(list
, tmp
) {
204 (tmp
->u
.ranged
)(fn
, call_expr
, assign_expr
, tmp
->info
);
205 } END_FOR_EACH_PTR(tmp
);
208 static struct call_back_list
*get_same_ranged_call_backs(struct call_back_list
*list
,
209 struct data_range
*drange
)
211 struct call_back_list
*ret
= NULL
;
212 struct fcall_back
*tmp
;
214 FOR_EACH_PTR(list
, tmp
) {
215 if (tmp
->type
!= RANGED_CALL
)
217 if (ranges_equiv(tmp
->range
, drange
))
218 add_ptr_list(&ret
, tmp
);
219 } END_FOR_EACH_PTR(tmp
);
223 static int in_list_exact_sval(struct range_list
*list
, struct data_range
*drange
)
225 struct data_range
*tmp
;
227 FOR_EACH_PTR(list
, tmp
) {
228 if (ranges_equiv(tmp
, drange
))
230 } END_FOR_EACH_PTR(tmp
);
234 static int assign_ranged_funcs(const char *fn
, struct expression
*expr
,
235 struct call_back_list
*call_backs
)
237 struct fcall_back
*tmp
;
241 struct smatch_state
*estate
;
242 struct stree
*tmp_stree
;
243 struct stree
*final_states
= NULL
;
244 struct range_list
*handled_ranges
= NULL
;
245 struct call_back_list
*same_range_call_backs
= NULL
;
251 var_name
= expr_to_var_sym(expr
->left
, &sym
);
252 if (!var_name
|| !sym
)
255 FOR_EACH_PTR(call_backs
, tmp
) {
256 if (tmp
->type
!= RANGED_CALL
)
259 if (in_list_exact_sval(handled_ranges
, tmp
->range
))
261 __push_fake_cur_stree();
262 tack_on(&handled_ranges
, tmp
->range
);
264 same_range_call_backs
= get_same_ranged_call_backs(call_backs
, tmp
->range
);
265 call_ranged_call_backs(same_range_call_backs
, fn
, expr
->right
, expr
);
266 __free_ptr_list((struct ptr_list
**)&same_range_call_backs
);
268 estate
= alloc_estate_range(tmp
->range
->min
, tmp
->range
->max
);
269 set_extra_mod(var_name
, sym
, estate
);
271 tmp_stree
= __pop_fake_cur_stree();
272 merge_fake_stree(&final_states
, tmp_stree
);
273 free_stree(&tmp_stree
);
275 } END_FOR_EACH_PTR(tmp
);
277 FOR_EACH_SM(final_states
, sm
) {
279 } END_FOR_EACH_SM(sm
);
281 free_stree(&final_states
);
283 free_string(var_name
);
287 static void call_implies_callbacks(int comparison
, struct expression
*expr
, sval_t sval
, int left
, struct stree
**implied_true
, struct stree
**implied_false
)
289 struct call_back_list
*call_backs
;
290 struct fcall_back
*tmp
;
292 struct data_range
*value_range
;
293 struct stree
*true_states
= NULL
;
294 struct stree
*false_states
= NULL
;
295 struct stree
*tmp_stree
;
297 *implied_true
= NULL
;
298 *implied_false
= NULL
;
299 if (expr
->fn
->type
!= EXPR_SYMBOL
|| !expr
->fn
->symbol
)
301 fn
= expr
->fn
->symbol
->ident
->name
;
302 call_backs
= search_callback(func_hash
, (char *)expr
->fn
->symbol
->ident
->name
);
305 value_range
= alloc_range(sval
, sval
);
307 /* set true states */
308 __push_fake_cur_stree();
309 FOR_EACH_PTR(call_backs
, tmp
) {
310 if (tmp
->type
!= RANGED_CALL
)
312 if (!true_comparison_range_LR(comparison
, tmp
->range
, value_range
, left
))
314 (tmp
->u
.ranged
)(fn
, expr
, NULL
, tmp
->info
);
315 } END_FOR_EACH_PTR(tmp
);
316 tmp_stree
= __pop_fake_cur_stree();
317 merge_fake_stree(&true_states
, tmp_stree
);
318 free_stree(&tmp_stree
);
320 /* set false states */
321 __push_fake_cur_stree();
322 FOR_EACH_PTR(call_backs
, tmp
) {
323 if (tmp
->type
!= RANGED_CALL
)
325 if (!false_comparison_range_LR(comparison
, tmp
->range
, value_range
, left
))
327 (tmp
->u
.ranged
)(fn
, expr
, NULL
, tmp
->info
);
328 } END_FOR_EACH_PTR(tmp
);
329 tmp_stree
= __pop_fake_cur_stree();
330 merge_fake_stree(&false_states
, tmp_stree
);
331 free_stree(&tmp_stree
);
333 *implied_true
= true_states
;
334 *implied_false
= false_states
;
337 struct db_callback_info
{
340 struct expression
*expr
;
341 struct range_list
*rl
;
344 struct db_implies_list
*callbacks
;
347 struct smatch_state
*ret_state
;
348 struct expression
*var_expr
;
351 static void store_return_state(struct db_callback_info
*db_info
, struct smatch_state
*state
)
353 db_info
->ret_state
= state
;
356 static void set_return_state(struct expression
*expr
, struct db_callback_info
*db_info
)
358 if (!db_info
->ret_state
)
361 set_extra_expr_mod(expr
, db_info
->ret_state
);
362 db_info
->ret_state
= NULL
;
365 static void handle_ret_equals_param(char *ret_string
, struct range_list
*rl
, struct expression
*call
)
369 struct expression
*arg
;
370 struct range_list
*orig
;
372 str
= strstr(ret_string
, "==$");
376 param
= strtoll(str
, NULL
, 10);
377 arg
= get_argument_from_call_expr(call
->args
, param
);
380 get_absolute_rl(arg
, &orig
);
381 rl
= rl_intersection(orig
, rl
);
384 set_extra_expr_nomod(arg
, alloc_estate_rl(rl
));
387 static int impossible_limit(struct expression
*expr
, int param
, char *key
, char *value
)
389 struct expression
*arg
;
390 struct range_list
*passed
;
391 struct range_list
*limit
;
392 struct symbol
*compare_type
;
394 if (strcmp(key
, "$") != 0)
397 while (expr
->type
== EXPR_ASSIGNMENT
)
398 expr
= strip_expr(expr
->right
);
399 if (expr
->type
!= EXPR_CALL
)
402 arg
= get_argument_from_call_expr(expr
->args
, param
);
405 if (!get_implied_rl(arg
, &passed
))
407 if (!passed
|| is_whole_rl(passed
))
410 compare_type
= get_arg_type(expr
->fn
, param
);
411 passed
= cast_rl(compare_type
, passed
);
412 call_results_to_rl(expr
, compare_type
, value
, &limit
);
413 if (!limit
|| is_whole_rl(limit
))
415 if (possibly_true_rl(passed
, SPECIAL_EQUAL
, limit
))
417 if (option_debug
|| local_debug
)
418 sm_msg("impossible: %d '%s' limit '%s' == '%s'", param
, key
, show_rl(passed
), value
);
422 static int db_compare_callback(void *_info
, int argc
, char **argv
, char **azColName
)
424 struct db_callback_info
*db_info
= _info
;
425 struct range_list
*var_rl
= db_info
->rl
;
426 struct range_list
*ret_range
;
429 struct return_implies_callback
*tmp
;
437 return_id
= atoi(argv
[0]);
438 type
= atoi(argv
[2]);
439 param
= atoi(argv
[3]);
443 if (db_info
->prev_return_id
!= -1 && return_id
!= db_info
->prev_return_id
) {
444 set_return_state(db_info
->var_expr
, db_info
);
445 stree
= __pop_fake_cur_stree();
448 merge_fake_stree(&db_info
->stree
, stree
);
450 __push_fake_cur_stree();
453 db_info
->prev_return_id
= return_id
;
457 if (type
== CULL_PATH
) {
461 if (type
== PARAM_LIMIT
&& impossible_limit(db_info
->expr
, param
, key
, value
)) {
466 call_results_to_rl(db_info
->expr
, get_type(strip_expr(db_info
->expr
)), argv
[1], &ret_range
);
467 ret_range
= cast_rl(get_type(db_info
->expr
), ret_range
);
469 ret_range
= alloc_whole_rl(get_type(db_info
->expr
));
471 comparison
= db_info
->comparison
;
473 comparison
= flip_comparison(comparison
);
475 if (db_info
->true_side
) {
476 if (!possibly_true_rl(var_rl
, comparison
, ret_range
))
478 if (type
== PARAM_LIMIT
)
479 param_limit_implications(db_info
->expr
, param
, key
, value
);
480 filter_by_comparison(&var_rl
, comparison
, ret_range
);
481 filter_by_comparison(&ret_range
, flip_comparison(comparison
), var_rl
);
483 if (!possibly_false_rl(var_rl
, comparison
, ret_range
))
485 if (type
== PARAM_LIMIT
)
486 param_limit_implications(db_info
->expr
, param
, key
, value
);
487 filter_by_comparison(&var_rl
, negate_comparison(comparison
), ret_range
);
488 filter_by_comparison(&ret_range
, flip_comparison(negate_comparison(comparison
)), var_rl
);
491 handle_ret_equals_param(argv
[1], ret_range
, db_info
->expr
);
493 FOR_EACH_PTR(db_info
->callbacks
, tmp
) {
494 if (tmp
->type
== type
)
495 tmp
->callback(db_info
->expr
, param
, key
, value
);
496 } END_FOR_EACH_PTR(tmp
);
498 store_return_state(db_info
, alloc_estate_rl(clone_rl(var_rl
)));
502 static void compare_db_return_states_callbacks(struct expression
*left
, int comparison
, struct expression
*right
, struct stree
*implied_true
, struct stree
*implied_false
)
504 struct stree
*orig_states
;
506 struct stree
*true_states
;
507 struct stree
*false_states
;
509 struct db_callback_info db_info
= {};
510 struct expression
*var_expr
;
511 struct expression
*call_expr
;
512 struct range_list
*rl
;
515 orig_states
= clone_stree(__get_cur_stree());
517 /* legacy cruft. need to fix call_implies_callbacks(). */
521 if (left
->type
!= EXPR_CALL
) {
527 get_absolute_rl(var_expr
, &rl
);
529 db_info
.comparison
= comparison
;
530 db_info
.expr
= call_expr
;
532 db_info
.left
= call_on_left
;
533 db_info
.callbacks
= db_return_states_list
;
534 db_info
.var_expr
= var_expr
;
536 call_return_states_before_hooks();
538 db_info
.true_side
= 1;
539 db_info
.stree
= NULL
;
540 db_info
.prev_return_id
= -1;
541 __push_fake_cur_stree();
542 sql_select_return_states("return_id, return, type, parameter, key, value",
543 call_expr
, db_compare_callback
, &db_info
);
544 set_return_state(db_info
.var_expr
, &db_info
);
545 stree
= __pop_fake_cur_stree();
547 set_return_state(db_info
.var_expr
, &db_info
);
548 merge_fake_stree(&db_info
.stree
, stree
);
551 true_states
= db_info
.stree
;
555 FOR_EACH_SM(orig_states
, sm
) {
556 __set_sm_cur_stree(sm
);
557 } END_FOR_EACH_SM(sm
);
559 db_info
.true_side
= 0;
560 db_info
.stree
= NULL
;
561 db_info
.prev_return_id
= -1;
563 __push_fake_cur_stree();
564 sql_select_return_states("return_id, return, type, parameter, key, value", call_expr
,
565 db_compare_callback
, &db_info
);
566 stree
= __pop_fake_cur_stree();
568 set_return_state(db_info
.var_expr
, &db_info
);
569 merge_fake_stree(&db_info
.stree
, stree
);
572 false_states
= db_info
.stree
;
576 FOR_EACH_SM(orig_states
, sm
) {
577 __set_sm_cur_stree(sm
);
578 } END_FOR_EACH_SM(sm
);
580 free_stree(&orig_states
);
582 FOR_EACH_SM(true_states
, sm
) {
583 __set_true_false_sm(sm
, NULL
);
584 } END_FOR_EACH_SM(sm
);
585 FOR_EACH_SM(false_states
, sm
) {
586 __set_true_false_sm(NULL
, sm
);
587 } END_FOR_EACH_SM(sm
);
589 free_stree(&true_states
);
590 free_stree(&false_states
);
592 call_return_states_after_hooks();
594 FOR_EACH_SM(implied_true
, sm
) {
595 __set_true_false_sm(sm
, NULL
);
596 } END_FOR_EACH_SM(sm
);
597 FOR_EACH_SM(implied_false
, sm
) {
598 __set_true_false_sm(NULL
, sm
);
599 } END_FOR_EACH_SM(sm
);
602 void function_comparison(struct expression
*left
, int comparison
, struct expression
*right
)
604 struct expression
*var_expr
;
605 struct expression
*call_expr
;
606 struct stree
*implied_true
= NULL
;
607 struct stree
*implied_false
= NULL
;
608 struct range_list
*rl
;
612 /* legacy cruft. need to fix call_implies_callbacks(). */
616 if (left
->type
!= EXPR_CALL
) {
622 get_absolute_rl(var_expr
, &rl
);
624 if (rl_to_sval(rl
, &sval
))
625 call_implies_callbacks(comparison
, call_expr
, sval
, call_on_left
, &implied_true
, &implied_false
);
627 compare_db_return_states_callbacks(left
, comparison
, right
, implied_true
, implied_false
);
628 free_stree(&implied_true
);
629 free_stree(&implied_false
);
632 static int db_assign_return_states_callback(void *_info
, int argc
, char **argv
, char **azColName
)
634 struct db_callback_info
*db_info
= _info
;
635 struct range_list
*ret_range
;
638 struct return_implies_callback
*tmp
;
645 return_id
= atoi(argv
[0]);
646 type
= atoi(argv
[2]);
647 param
= atoi(argv
[3]);
651 if (db_info
->prev_return_id
!= -1 && return_id
!= db_info
->prev_return_id
) {
652 set_return_state(db_info
->expr
->left
, db_info
);
653 stree
= __pop_fake_cur_stree();
655 merge_fake_stree(&db_info
->stree
, stree
);
657 __push_fake_cur_stree();
660 db_info
->prev_return_id
= return_id
;
664 if (type
== CULL_PATH
) {
668 if (type
== PARAM_LIMIT
&& impossible_limit(db_info
->expr
, param
, key
, value
)) {
673 call_results_to_rl(db_info
->expr
->right
, get_type(strip_expr(db_info
->expr
->right
)), argv
[1], &ret_range
);
674 __add_comparison_info(db_info
->expr
->left
, strip_expr(db_info
->expr
->right
), argv
[1]);
676 ret_range
= alloc_whole_rl(get_type(strip_expr(db_info
->expr
->right
)));
677 ret_range
= cast_rl(get_type(db_info
->expr
->right
), ret_range
);
679 FOR_EACH_PTR(db_return_states_list
, tmp
) {
680 if (tmp
->type
== type
)
681 tmp
->callback(db_info
->expr
, param
, key
, value
);
682 } END_FOR_EACH_PTR(tmp
);
683 ret_range
= cast_rl(get_type(db_info
->expr
->left
), ret_range
);
684 store_return_state(db_info
, alloc_estate_rl(ret_range
));
689 static int db_return_states_assign(struct expression
*expr
)
691 struct expression
*right
;
695 struct db_callback_info db_info
= {};
697 right
= strip_expr(expr
->right
);
699 db_info
.prev_return_id
= -1;
701 db_info
.stree
= NULL
;
703 call_return_states_before_hooks();
705 __push_fake_cur_stree();
706 sql_select_return_states("return_id, return, type, parameter, key, value",
707 right
, db_assign_return_states_callback
, &db_info
);
709 sm_msg("%s return_id %d return_ranges %s",
710 db_info
.cull
? "culled" : "merging",
711 db_info
.prev_return_id
,
712 db_info
.ret_state
? db_info
.ret_state
->name
: "'<empty'");
714 set_return_state(db_info
.expr
->left
, &db_info
);
715 stree
= __pop_fake_cur_stree();
717 merge_fake_stree(&db_info
.stree
, stree
);
720 FOR_EACH_SM(db_info
.stree
, sm
) {
723 } END_FOR_EACH_SM(sm
);
725 free_stree(&db_info
.stree
);
726 call_return_states_after_hooks();
731 static int handle_implied_return(struct expression
*expr
)
733 struct range_list
*rl
;
735 if (!get_implied_return(expr
->right
, &rl
))
737 rl
= cast_rl(get_type(expr
->left
), rl
);
738 set_extra_expr_mod(expr
->left
, alloc_estate_rl(rl
));
742 static void match_assign_call(struct expression
*expr
)
744 struct call_back_list
*call_backs
;
746 struct expression
*right
;
748 struct range_list
*rl
;
753 right
= strip_expr(expr
->right
);
754 if (right
->fn
->type
!= EXPR_SYMBOL
|| !right
->fn
->symbol
) {
755 handled
|= db_return_states_assign(expr
);
757 goto assigned_unknown
;
760 if (is_fake_call(right
)) {
761 set_extra_expr_mod(expr
->left
, alloc_estate_whole(get_type(expr
->left
)));
765 fn
= right
->fn
->symbol
->ident
->name
;
768 * some of these conflict (they try to set smatch extra twice), so we
769 * call them in order from least important to most important.
772 call_backs
= search_callback(func_hash
, (char *)fn
);
773 call_call_backs(call_backs
, ASSIGN_CALL
, fn
, expr
);
775 handled
|= db_return_states_assign(expr
);
776 handled
|= assign_ranged_funcs(fn
, expr
, call_backs
);
777 handled
|= handle_implied_return(expr
);
783 get_absolute_rl(expr
->right
, &rl
);
784 rl
= cast_rl(get_type(expr
->left
), rl
);
785 set_extra_expr_mod(expr
->left
, alloc_estate_rl(rl
));
788 static int db_return_states_callback(void *_info
, int argc
, char **argv
, char **azColName
)
790 struct db_callback_info
*db_info
= _info
;
791 struct range_list
*ret_range
;
794 struct return_implies_callback
*tmp
;
802 return_id
= atoi(argv
[0]);
803 type
= atoi(argv
[2]);
804 param
= atoi(argv
[3]);
808 if (db_info
->prev_return_id
!= -1 && return_id
!= db_info
->prev_return_id
) {
809 stree
= __pop_fake_cur_stree();
811 merge_fake_stree(&db_info
->stree
, stree
);
813 __push_fake_cur_stree();
817 db_info
->prev_return_id
= return_id
;
821 if (type
== CULL_PATH
) {
825 if (type
== PARAM_LIMIT
&& impossible_limit(db_info
->expr
, param
, key
, value
)) {
830 call_results_to_rl(db_info
->expr
, get_type(strip_expr(db_info
->expr
)), argv
[1], &ret_range
);
831 ret_range
= cast_rl(get_type(db_info
->expr
), ret_range
);
833 FOR_EACH_PTR(db_return_states_list
, tmp
) {
834 if (tmp
->type
== type
)
835 tmp
->callback(db_info
->expr
, param
, key
, value
);
836 } END_FOR_EACH_PTR(tmp
);
839 * We want to store the return values so that we can split the strees
840 * in smatch_db.c. This uses set_state() directly because it's not a
841 * real smatch_extra state.
843 snprintf(buf
, sizeof(buf
), "return %p", db_info
->expr
);
844 set_state(SMATCH_EXTRA
, buf
, NULL
, alloc_estate_rl(ret_range
));
849 static void db_return_states(struct expression
*expr
)
853 struct db_callback_info db_info
= {};
855 if (!__get_cur_stree()) /* no return functions */
858 db_info
.prev_return_id
= -1;
860 db_info
.stree
= NULL
;
862 call_return_states_before_hooks();
864 __push_fake_cur_stree();
866 sql_select_return_states("return_id, return, type, parameter, key, value",
867 expr
, db_return_states_callback
, &db_info
);
868 stree
= __pop_fake_cur_stree();
870 merge_fake_stree(&db_info
.stree
, stree
);
873 FOR_EACH_SM(db_info
.stree
, sm
) {
875 } END_FOR_EACH_SM(sm
);
877 free_stree(&db_info
.stree
);
878 call_return_states_after_hooks();
881 static int is_condition_call(struct expression
*expr
)
883 struct expression
*tmp
;
885 FOR_EACH_PTR_REVERSE(big_condition_stack
, tmp
) {
886 if (expr
== tmp
|| expr
->parent
== tmp
)
888 if (tmp
->pos
.line
< expr
->pos
.line
)
890 } END_FOR_EACH_PTR_REVERSE(tmp
);
895 static void db_return_states_call(struct expression
*expr
)
897 if (is_assigned_call(expr
))
899 if (is_condition_call(expr
))
901 db_return_states(expr
);
904 static void match_function_call(struct expression
*expr
)
906 struct call_back_list
*call_backs
;
908 if (expr
->fn
->type
== EXPR_SYMBOL
&& expr
->fn
->symbol
) {
909 call_backs
= search_callback(func_hash
, (char *)expr
->fn
->symbol
->ident
->name
);
911 call_call_backs(call_backs
, REGULAR_CALL
,
912 expr
->fn
->symbol
->ident
->name
, expr
);
914 db_return_states_call(expr
);
917 static void match_macro_assign(struct expression
*expr
)
919 struct call_back_list
*call_backs
;
921 struct expression
*right
;
923 right
= strip_expr(expr
->right
);
924 macro
= get_macro_name(right
->pos
);
925 call_backs
= search_callback(func_hash
, (char *)macro
);
928 call_call_backs(call_backs
, MACRO_ASSIGN
, macro
, expr
);
929 call_call_backs(call_backs
, MACRO_ASSIGN_EXTRA
, macro
, expr
);
932 int get_implied_return(struct expression
*expr
, struct range_list
**rl
)
934 struct call_back_list
*call_backs
;
935 struct fcall_back
*tmp
;
941 expr
= strip_expr(expr
);
942 fn
= expr_to_var(expr
->fn
);
946 call_backs
= search_callback(func_hash
, fn
);
948 FOR_EACH_PTR(call_backs
, tmp
) {
949 if (tmp
->type
== IMPLIED_RETURN
) {
950 (tmp
->u
.implied_return
)(expr
, tmp
->info
, rl
);
953 } END_FOR_EACH_PTR(tmp
);
960 void create_function_hook_hash(void)
962 func_hash
= create_function_hashtable(5000);
965 void register_function_hooks(int id
)
967 add_hook(&match_function_call
, CALL_HOOK_AFTER_INLINE
);
968 add_hook(&match_assign_call
, CALL_ASSIGNMENT_HOOK
);
969 add_hook(&match_macro_assign
, MACRO_ASSIGNMENT_HOOK
);