2 * Copyright (C) 2006,2008 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
24 #include "smatch_expression_stacks.h"
25 #include "smatch_extra.h"
26 #include "smatch_slist.h"
31 struct expression
*__inline_fn
;
33 static int __smatch_lineno
= 0;
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 int __expr_stmt_count
;
42 int __in_function_def
;
43 static struct expression_list
*switch_expr_stack
= NULL
;
44 static struct expression_list
*post_op_stack
= NULL
;
46 struct expression_list
*big_expression_stack
;
47 struct statement_list
*big_statement_stack
;
48 int __in_pre_condition
= 0;
49 int __bail_on_rest_of_function
= 0;
50 static struct timeval fn_start_time
;
51 char *get_function(void) { return cur_func
; }
52 int get_lineno(void) { return __smatch_lineno
; }
53 int inside_loop(void) { return !!loop_count
; }
54 int definitely_inside_loop(void) { return !!(loop_count
& ~0x80000000); }
55 struct expression
*get_switch_expr(void) { return top_expression(switch_expr_stack
); }
56 int in_expression_statement(void) { return !!__expr_stmt_count
; }
58 static void split_symlist(struct symbol_list
*sym_list
);
59 static void split_declaration(struct symbol_list
*sym_list
);
60 static void split_expr_list(struct expression_list
*expr_list
);
61 static void add_inline_function(struct symbol
*sym
);
62 static void parse_inline(struct expression
*expr
);
64 int option_assume_loops
= 0;
65 int option_known_conditions
= 0;
66 int option_two_passes
= 0;
67 struct symbol
*cur_func_sym
= NULL
;
69 int outside_of_function(void)
71 return cur_func_sym
== NULL
;
74 const char *get_filename(void)
83 const char *get_base_file(void)
88 static void set_position(struct position pos
)
91 static int prev_stream
= -1;
93 if (pos
.stream
== 0 && pos
.line
== 0)
96 __smatch_lineno
= pos
.line
;
98 if (pos
.stream
== prev_stream
)
101 filename
= stream_name(pos
.stream
);
104 pathname
= getcwd(NULL
, 0);
106 len
= strlen(pathname
) + 1 + strlen(filename
) + 1;
107 full_filename
= malloc(len
);
108 snprintf(full_filename
, len
, "%s/%s", pathname
, filename
);
110 full_filename
= alloc_string(filename
);
115 static int is_inline_func(struct expression
*expr
)
117 if (expr
->type
!= EXPR_SYMBOL
|| !expr
->symbol
)
119 if (expr
->symbol
->ctype
.modifiers
& MOD_INLINE
)
124 static int is_noreturn_func(struct expression
*expr
)
126 if (expr
->type
!= EXPR_SYMBOL
|| !expr
->symbol
)
128 if (expr
->symbol
->ctype
.modifiers
& MOD_NORETURN
)
133 int inlinable(struct expression
*expr
)
137 if (__inline_fn
) /* don't nest */
140 if (expr
->type
!= EXPR_SYMBOL
|| !expr
->symbol
)
142 if (is_no_inline_function(expr
->symbol
->ident
->name
))
144 sym
= get_base_type(expr
->symbol
);
145 if (sym
->stmt
&& sym
->stmt
->type
== STMT_COMPOUND
) {
146 if (ptr_list_size((struct ptr_list
*)sym
->stmt
->stmts
) <= 10)
150 if (sym
->inline_stmt
&& sym
->inline_stmt
->type
== STMT_COMPOUND
) {
151 if (ptr_list_size((struct ptr_list
*)sym
->inline_stmt
->stmts
) <= 10)
158 void __process_post_op_stack(void)
160 struct expression
*expr
;
162 FOR_EACH_PTR(post_op_stack
, expr
) {
163 __pass_to_client(expr
, OP_HOOK
);
164 } END_FOR_EACH_PTR(expr
);
166 __free_ptr_list((struct ptr_list
**)&post_op_stack
);
169 void __split_expr(struct expression
*expr
)
174 // sm_msg(" Debug expr_type %d %s", expr->type, show_special(expr->op));
176 if (__in_fake_assign
&& expr
->type
!= EXPR_ASSIGNMENT
)
178 if (__in_fake_assign
>= 4) /* don't allow too much nesting */
181 push_expression(&big_expression_stack
, expr
);
182 set_position(expr
->pos
);
183 __pass_to_client(expr
, EXPR_HOOK
);
185 switch (expr
->type
) {
188 __pass_to_client(expr
, DEREF_HOOK
);
189 __split_expr(expr
->unop
);
190 __pass_to_client(expr
, OP_HOOK
);
193 __split_expr(expr
->unop
);
194 push_expression(&post_op_stack
, expr
);
198 __split_stmt(expr
->statement
);
203 __pass_to_client(expr
, LOGIC_HOOK
);
204 __handle_logic(expr
);
207 __pass_to_client(expr
, BINOP_HOOK
);
209 __split_expr(expr
->left
);
210 __process_post_op_stack();
211 __split_expr(expr
->right
);
213 case EXPR_ASSIGNMENT
: {
214 struct expression
*tmp
;
219 __pass_to_client(expr
, RAW_ASSIGNMENT_HOOK
);
222 if (__handle_condition_assigns(expr
))
224 /* foo = (x < 5 ? foo : 5); */
225 if (__handle_select_assigns(expr
))
227 /* foo = ({frob(); frob(); frob(); 1;}) */
228 if (__handle_expr_statement_assigns(expr
))
231 __split_expr(expr
->right
);
232 if (outside_of_function())
233 __pass_to_client(expr
, GLOBAL_ASSIGNMENT_HOOK
);
235 __pass_to_client(expr
, ASSIGNMENT_HOOK
);
237 __fake_struct_member_assignments(expr
);
239 tmp
= strip_expr(expr
->right
);
240 if (tmp
->type
== EXPR_CALL
)
241 __pass_to_client(expr
, CALL_ASSIGNMENT_HOOK
);
242 if (get_macro_name(tmp
->pos
) &&
243 get_macro_name(expr
->pos
) != get_macro_name(tmp
->pos
))
244 __pass_to_client(expr
, MACRO_ASSIGNMENT_HOOK
);
245 __split_expr(expr
->left
);
249 __pass_to_client(expr
, DEREF_HOOK
);
250 __split_expr(expr
->deref
);
253 __split_expr(expr
->base
);
256 case EXPR_FORCE_CAST
:
257 __pass_to_client(expr
, CAST_HOOK
);
258 __split_expr(expr
->cast_expression
);
261 if (expr
->cast_expression
)
262 __pass_to_client(strip_parens(expr
->cast_expression
),
267 evaluate_expression(expr
);
269 case EXPR_CONDITIONAL
:
271 if (known_condition_true(expr
->conditional
)) {
272 __split_expr(expr
->cond_true
);
275 if (known_condition_false(expr
->conditional
)) {
276 __split_expr(expr
->cond_false
);
279 __pass_to_client(expr
, SELECT_HOOK
);
280 __split_whole_condition(expr
->conditional
);
281 __split_expr(expr
->cond_true
);
282 __push_true_states();
283 __use_false_states();
284 __split_expr(expr
->cond_false
);
285 __merge_true_states();
288 if (sym_name_is("__builtin_constant_p", expr
->fn
))
290 split_expr_list(expr
->args
);
291 __split_expr(expr
->fn
);
292 if (is_inline_func(expr
->fn
))
293 add_inline_function(expr
->fn
->symbol
);
294 if (inlinable(expr
->fn
))
296 __process_post_op_stack();
297 __pass_to_client(expr
, FUNCTION_CALL_HOOK
);
299 if (inlinable(expr
->fn
)) {
302 __pass_to_client(expr
, CALL_HOOK_AFTER_INLINE
);
303 if (is_noreturn_func(expr
->fn
))
306 case EXPR_INITIALIZER
:
307 split_expr_list(expr
->expr_list
);
309 case EXPR_IDENTIFIER
:
310 __split_expr(expr
->ident_expression
);
313 __split_expr(expr
->idx_expression
);
316 __split_expr(expr
->init_expr
);
319 __pass_to_client(expr
, SYM_HOOK
);
322 __pass_to_client(expr
, STRING_HOOK
);
327 pop_expression(&big_expression_stack
);
330 static int is_forever_loop(struct statement
*stmt
)
332 struct expression
*expr
;
334 expr
= strip_expr(stmt
->iterator_pre_condition
);
336 expr
= stmt
->iterator_post_condition
;
338 /* this is a for(;;) loop... */
342 if (expr
->type
== EXPR_VALUE
&& expr
->value
== 1)
349 static char *get_loop_name(int num
)
353 snprintf(buf
, 255, "-loop%d", num
);
355 return alloc_sname(buf
);
359 * Pre Loops are while and for loops.
361 static void handle_pre_loop(struct statement
*stmt
)
363 int once_through
; /* we go through the loop at least once */
364 struct sm_state
*extra_sm
= NULL
;
367 struct stree
*stree
= NULL
;
368 struct sm_state
*sm
= NULL
;
370 loop_name
= get_loop_name(loop_num
);
373 __split_stmt(stmt
->iterator_pre_statement
);
375 once_through
= implied_condition_true(stmt
->iterator_pre_condition
);
381 __merge_gotos(loop_name
);
383 extra_sm
= __extra_handle_canonical_loops(stmt
, &stree
);
384 __in_pre_condition
++;
385 __pass_to_client(stmt
, PRELOOP_HOOK
);
386 __split_whole_condition(stmt
->iterator_pre_condition
);
387 __in_pre_condition
--;
388 FOR_EACH_SM(stree
, sm
) {
389 set_state(sm
->owner
, sm
->name
, sm
->sym
, sm
->state
);
390 } END_FOR_EACH_SM(sm
);
393 extra_sm
= get_sm_state(extra_sm
->owner
, extra_sm
->name
, extra_sm
->sym
);
395 if (option_assume_loops
)
398 __split_stmt(stmt
->iterator_statement
);
399 __warn_on_silly_pre_loops();
400 if (is_forever_loop(stmt
)) {
401 __save_gotos(loop_name
);
403 __push_fake_cur_stree();
404 __split_stmt(stmt
->iterator_post_statement
);
405 stree
= __pop_fake_cur_stree();
407 __discard_continues();
408 __discard_false_states();
411 if (!__path_is_null())
412 __merge_stree_into_cur(stree
);
416 unchanged
= __iterator_unchanged(extra_sm
);
417 __split_stmt(stmt
->iterator_post_statement
);
418 __save_gotos(loop_name
);
419 __split_whole_condition(stmt
->iterator_pre_condition
);
421 __merge_false_states();
423 __discard_false_states();
425 __merge_false_states();
427 if (extra_sm
&& unchanged
)
428 __extra_pre_loop_hook_after(extra_sm
,
429 stmt
->iterator_post_statement
,
430 stmt
->iterator_pre_condition
);
437 * Post loops are do {} while();
439 static void handle_post_loop(struct statement
*stmt
)
443 loop_name
= get_loop_name(loop_num
);
449 __merge_gotos(loop_name
);
450 __split_stmt(stmt
->iterator_statement
);
452 if (!is_zero(stmt
->iterator_post_condition
))
453 __save_gotos(loop_name
);
455 if (is_forever_loop(stmt
)) {
458 __split_whole_condition(stmt
->iterator_post_condition
);
459 __use_false_states();
465 static int empty_statement(struct statement
*stmt
)
469 if (stmt
->type
== STMT_EXPRESSION
&& !stmt
->expression
)
474 static int last_stmt_on_same_line()
476 struct statement
*stmt
;
479 FOR_EACH_PTR_REVERSE(big_statement_stack
, stmt
) {
482 if (stmt
->pos
.line
== get_lineno())
485 } END_FOR_EACH_PTR_REVERSE(stmt
);
489 static void split_asm_constraints(struct expression_list
*expr_list
)
491 struct expression
*expr
;
494 FOR_EACH_PTR(expr_list
, expr
) {
496 case 0: /* identifier */
497 case 1: /* constraint */
500 case 2: /* expression */
505 } END_FOR_EACH_PTR(expr
);
508 static int is_case_val(struct statement
*stmt
, sval_t sval
)
512 if (stmt
->type
!= STMT_CASE
)
514 if (!stmt
->case_expression
) {
518 if (!get_value(stmt
->case_expression
, &case_sval
))
520 if (case_sval
.value
== sval
.value
)
525 static void split_known_switch(struct statement
*stmt
, sval_t sval
)
527 struct statement
*tmp
;
529 __split_expr(stmt
->switch_expression
);
531 push_expression(&switch_expr_stack
, stmt
->switch_expression
);
532 __save_switch_states(top_expression(switch_expr_stack
));
537 stmt
= stmt
->switch_statement
;
539 __push_scope_hooks();
540 FOR_EACH_PTR(stmt
->stmts
, tmp
) {
541 __smatch_lineno
= tmp
->pos
.line
;
542 if (is_case_val(tmp
, sval
)) {
543 __merge_switches(top_expression(switch_expr_stack
),
544 stmt
->case_expression
);
545 __pass_case_to_client(top_expression(switch_expr_stack
),
546 stmt
->case_expression
);
548 if (__path_is_null())
551 if (__path_is_null()) {
555 } END_FOR_EACH_PTR(tmp
);
557 __call_scope_hooks();
558 if (!__pop_default())
559 __merge_switches(top_expression(switch_expr_stack
),
561 __discard_switches();
563 pop_expression(&switch_expr_stack
);
566 static int taking_too_long(void)
570 ms
= ms_since(&fn_start_time
);
571 if (ms
> 1000 * 60 * 5) /* five minutes */
576 void __split_stmt(struct statement
*stmt
)
583 if (__bail_on_rest_of_function
|| out_of_memory() || taking_too_long()) {
584 static char *printed
= NULL
;
586 __bail_on_rest_of_function
= 1;
587 if (printed
!= cur_func
)
588 sm_msg("Function too hairy. Giving up.");
589 final_pass
= 0; /* turn off sm_msg() from here */
594 add_ptr_list(&big_statement_stack
, stmt
);
595 free_expression_stack(&big_expression_stack
);
596 set_position(stmt
->pos
);
597 __pass_to_client(stmt
, STMT_HOOK
);
599 switch (stmt
->type
) {
600 case STMT_DECLARATION
:
601 split_declaration(stmt
->declaration
);
604 __split_expr(stmt
->ret_value
);
605 __pass_to_client(stmt
->ret_value
, RETURN_HOOK
);
608 case STMT_EXPRESSION
:
609 __split_expr(stmt
->expression
);
611 case STMT_COMPOUND
: {
612 struct statement
*tmp
;
614 __push_scope_hooks();
615 FOR_EACH_PTR(stmt
->stmts
, tmp
) {
617 } END_FOR_EACH_PTR(tmp
);
618 __call_scope_hooks();
622 if (known_condition_true(stmt
->if_conditional
)) {
623 __split_stmt(stmt
->if_true
);
626 if (known_condition_false(stmt
->if_conditional
)) {
627 __split_stmt(stmt
->if_false
);
630 if (option_known_conditions
&&
631 implied_condition_true(stmt
->if_conditional
)) {
632 sm_info("this condition is true.");
633 __split_stmt(stmt
->if_true
);
636 if (option_known_conditions
&&
637 implied_condition_false(stmt
->if_conditional
)) {
638 sm_info("this condition is false.");
639 __split_stmt(stmt
->if_false
);
642 __split_whole_condition(stmt
->if_conditional
);
643 __split_stmt(stmt
->if_true
);
644 if (empty_statement(stmt
->if_true
) &&
645 last_stmt_on_same_line() &&
646 !get_macro_name(stmt
->if_true
->pos
))
647 sm_msg("warn: if();");
648 __push_true_states();
649 __use_false_states();
650 __split_stmt(stmt
->if_false
);
651 __merge_true_states();
654 if (stmt
->iterator_pre_condition
)
655 handle_pre_loop(stmt
);
656 else if (stmt
->iterator_post_condition
)
657 handle_post_loop(stmt
);
659 // these are for(;;) type loops.
660 handle_pre_loop(stmt
);
664 if (get_value(stmt
->switch_expression
, &sval
)) {
665 split_known_switch(stmt
, sval
);
668 __split_expr(stmt
->switch_expression
);
669 push_expression(&switch_expr_stack
, stmt
->switch_expression
);
670 __save_switch_states(top_expression(switch_expr_stack
));
674 __split_stmt(stmt
->switch_statement
);
675 if (!__pop_default())
676 __merge_switches(top_expression(switch_expr_stack
),
678 __discard_switches();
680 pop_expression(&switch_expr_stack
);
683 __merge_switches(top_expression(switch_expr_stack
),
684 stmt
->case_expression
);
685 __pass_case_to_client(top_expression(switch_expr_stack
),
686 stmt
->case_expression
);
687 if (!stmt
->case_expression
)
689 __split_expr(stmt
->case_expression
);
690 __split_expr(stmt
->case_to
);
691 __split_stmt(stmt
->case_statement
);
694 if (stmt
->label_identifier
&&
695 stmt
->label_identifier
->type
== SYM_LABEL
&&
696 stmt
->label_identifier
->ident
) {
697 loop_count
|= 0x80000000;
698 __merge_gotos(stmt
->label_identifier
->ident
->name
);
700 __split_stmt(stmt
->label_statement
);
703 __split_expr(stmt
->goto_expression
);
704 if (stmt
->goto_label
&& stmt
->goto_label
->type
== SYM_NODE
) {
705 if (!strcmp(stmt
->goto_label
->ident
->name
, "break")) {
707 } else if (!strcmp(stmt
->goto_label
->ident
->name
,
709 __process_continues();
711 } else if (stmt
->goto_label
&&
712 stmt
->goto_label
->type
== SYM_LABEL
&&
713 stmt
->goto_label
->ident
) {
714 __save_gotos(stmt
->goto_label
->ident
->name
);
721 __pass_to_client(stmt
, ASM_HOOK
);
722 __split_expr(stmt
->asm_string
);
723 split_asm_constraints(stmt
->asm_outputs
);
724 split_asm_constraints(stmt
->asm_inputs
);
725 split_asm_constraints(stmt
->asm_clobbers
);
730 __split_expr(stmt
->range_expression
);
731 __split_expr(stmt
->range_low
);
732 __split_expr(stmt
->range_high
);
735 __pass_to_client(stmt
, STMT_HOOK_AFTER
);
737 __process_post_op_stack();
740 static void split_expr_list(struct expression_list
*expr_list
)
742 struct expression
*expr
;
744 FOR_EACH_PTR(expr_list
, expr
) {
746 __process_post_op_stack();
747 } END_FOR_EACH_PTR(expr
);
750 static void split_sym(struct symbol
*sym
)
754 if (!(sym
->namespace & NS_SYMBOL
))
757 __split_stmt(sym
->stmt
);
758 __split_expr(sym
->array_size
);
759 split_symlist(sym
->arguments
);
760 split_symlist(sym
->symbol_list
);
761 __split_stmt(sym
->inline_stmt
);
762 split_symlist(sym
->inline_symbol_list
);
765 static void split_symlist(struct symbol_list
*sym_list
)
769 FOR_EACH_PTR(sym_list
, sym
) {
771 } END_FOR_EACH_PTR(sym
);
774 typedef void (fake_cb
)(struct expression
*expr
);
776 static int member_to_number(struct expression
*expr
, struct ident
*member
)
778 struct symbol
*type
, *tmp
;
786 type
= get_type(expr
);
787 if (!type
|| type
->type
!= SYM_STRUCT
)
791 FOR_EACH_PTR(type
->symbol_list
, tmp
) {
795 if (strcmp(name
, tmp
->ident
->name
) == 0)
797 } END_FOR_EACH_PTR(tmp
);
801 static struct ident
*number_to_member(struct expression
*expr
, int num
)
803 struct symbol
*type
, *member
;
806 type
= get_type(expr
);
807 if (!type
|| type
->type
!= SYM_STRUCT
)
810 FOR_EACH_PTR(type
->symbol_list
, member
) {
812 return member
->ident
;
814 } END_FOR_EACH_PTR(member
);
818 static void fake_element_assigns_helper(struct expression
*array
, struct expression_list
*expr_list
, fake_cb
*fake_cb
);
825 static struct member_set
*alloc_member_set(struct symbol
*type
)
827 struct member_set
*member_set
;
828 struct symbol
*member
;
832 member_count
= ptr_list_size((struct ptr_list
*)type
->symbol_list
);
833 member_set
= malloc(member_count
* sizeof(*member_set
));
835 FOR_EACH_PTR(type
->symbol_list
, member
) {
836 member_set
[member_idx
].ident
= member
->ident
;
837 member_set
[member_idx
].set
= 0;
839 } END_FOR_EACH_PTR(member
);
844 static void mark_member_as_set(struct symbol
*type
, struct member_set
*member_set
, struct ident
*ident
)
846 int member_count
= ptr_list_size((struct ptr_list
*)type
->symbol_list
);
849 for (i
= 0; i
< member_count
; i
++) {
850 if (member_set
[i
].ident
== ident
) {
851 member_set
[i
].set
= 1;
855 // crap. this is buggy.
856 // sm_msg("internal smatch error in initializer %s.%s", type->ident->name, ident->name);
859 static void set_unset_to_zero(struct expression
*symbol
, struct symbol
*type
, struct member_set
*member_set
)
861 struct expression
*deref
, *assign
;
862 struct symbol
*member
, *member_type
;
866 FOR_EACH_PTR(type
->symbol_list
, member
) {
867 if (!member
->ident
|| member_set
[member_idx
].set
) {
871 member_type
= get_real_base_type(member
);
872 if (!member_type
|| member_type
->type
== SYM_ARRAY
) {
876 /* TODO: this should be handled recursively and not ignored */
877 if (member_type
->type
== SYM_STRUCT
|| member_type
->type
== SYM_UNION
) {
881 deref
= member_expression(symbol
, '.', member
->ident
);
882 assign
= assign_expression(deref
, zero_expr());
883 __split_expr(assign
);
885 } END_FOR_EACH_PTR(member
);
889 static void fake_member_assigns_helper(struct expression
*symbol
, struct expression_list
*members
, fake_cb
*fake_cb
)
891 struct expression
*deref
, *assign
, *tmp
;
892 struct symbol
*struct_type
, *type
;
893 struct ident
*member
;
895 struct member_set
*member_set
;
897 struct_type
= get_type(symbol
);
899 (struct_type
->type
!= SYM_STRUCT
&& struct_type
->type
!= SYM_UNION
))
902 member_set
= alloc_member_set(struct_type
);
905 FOR_EACH_PTR(members
, tmp
) {
906 member
= number_to_member(symbol
, member_idx
);
907 while (tmp
->type
== EXPR_IDENTIFIER
) {
908 member
= tmp
->expr_ident
;
909 member_idx
= member_to_number(symbol
, member
);
910 tmp
= tmp
->ident_expression
;
912 mark_member_as_set(struct_type
, member_set
, member
);
914 deref
= member_expression(symbol
, '.', member
);
915 if (tmp
->type
== EXPR_INITIALIZER
) {
916 type
= get_type(deref
);
917 if (type
&& type
->type
== SYM_ARRAY
)
918 fake_element_assigns_helper(deref
, tmp
->expr_list
, fake_cb
);
920 fake_member_assigns_helper(deref
, tmp
->expr_list
, fake_cb
);
922 assign
= assign_expression(deref
, tmp
);
925 } END_FOR_EACH_PTR(tmp
);
927 set_unset_to_zero(symbol
, struct_type
, member_set
);
930 static void fake_member_assigns(struct symbol
*sym
, fake_cb
*fake_cb
)
932 fake_member_assigns_helper(symbol_expression(sym
),
933 sym
->initializer
->expr_list
, fake_cb
);
936 static void fake_element_assigns_helper(struct expression
*array
, struct expression_list
*expr_list
, fake_cb
*fake_cb
)
938 struct expression
*offset
, *binop
, *assign
, *tmp
;
943 FOR_EACH_PTR(expr_list
, tmp
) {
944 if (tmp
->type
== EXPR_INDEX
) {
945 if (tmp
->idx_from
!= tmp
->idx_to
)
948 if (!tmp
->idx_expression
)
950 tmp
= tmp
->idx_expression
;
952 offset
= value_expr(idx
);
953 binop
= array_element_expression(array
, offset
);
954 if (tmp
->type
== EXPR_INITIALIZER
) {
955 type
= get_type(binop
);
956 if (type
&& type
->type
== SYM_ARRAY
)
957 fake_element_assigns_helper(binop
, tmp
->expr_list
, fake_cb
);
959 fake_member_assigns_helper(binop
, tmp
->expr_list
, fake_cb
);
961 assign
= assign_expression(binop
, tmp
);
966 } END_FOR_EACH_PTR(tmp
);
969 static void fake_element_assigns(struct symbol
*sym
, fake_cb
*fake_cb
)
971 fake_element_assigns_helper(symbol_expression(sym
), sym
->initializer
->expr_list
, fake_cb
);
974 static void fake_assign_expr(struct symbol
*sym
)
976 struct expression
*assign
, *symbol
;
978 symbol
= symbol_expression(sym
);
979 assign
= assign_expression(symbol
, sym
->initializer
);
980 __split_expr(assign
);
983 static void call_split_expr(struct expression
*expr
)
988 static void do_initializer_stuff(struct symbol
*sym
)
990 if (!sym
->initializer
)
993 if (sym
->initializer
->type
== EXPR_INITIALIZER
) {
994 if (get_real_base_type(sym
)->type
== SYM_ARRAY
)
995 fake_element_assigns(sym
, call_split_expr
);
997 fake_member_assigns(sym
, call_split_expr
);
999 fake_assign_expr(sym
);
1003 static void split_declaration(struct symbol_list
*sym_list
)
1007 FOR_EACH_PTR(sym_list
, sym
) {
1008 __pass_to_client(sym
, DECLARATION_HOOK
);
1009 do_initializer_stuff(sym
);
1011 } END_FOR_EACH_PTR(sym
);
1014 static void call_global_assign_hooks(struct expression
*assign
)
1016 __pass_to_client(assign
, GLOBAL_ASSIGNMENT_HOOK
);
1019 static void fake_global_assign(struct symbol
*sym
)
1021 struct expression
*assign
, *symbol
;
1023 if (get_real_base_type(sym
)->type
== SYM_ARRAY
) {
1024 if (sym
->initializer
&& sym
->initializer
->type
== EXPR_INITIALIZER
) {
1025 fake_element_assigns(sym
, call_global_assign_hooks
);
1026 } else if (sym
->initializer
) {
1027 symbol
= symbol_expression(sym
);
1028 assign
= assign_expression(symbol
, sym
->initializer
);
1029 __pass_to_client(assign
, GLOBAL_ASSIGNMENT_HOOK
);
1031 fake_element_assigns_helper(symbol_expression(sym
), NULL
, call_global_assign_hooks
);
1033 } else if (get_real_base_type(sym
)->type
== SYM_STRUCT
) {
1034 if (sym
->initializer
&& sym
->initializer
->type
== EXPR_INITIALIZER
) {
1035 fake_member_assigns(sym
, call_global_assign_hooks
);
1036 } else if (sym
->initializer
) {
1037 symbol
= symbol_expression(sym
);
1038 assign
= assign_expression(symbol
, sym
->initializer
);
1039 __pass_to_client(assign
, GLOBAL_ASSIGNMENT_HOOK
);
1041 fake_member_assigns_helper(symbol_expression(sym
), NULL
, call_global_assign_hooks
);
1044 symbol
= symbol_expression(sym
);
1045 if (sym
->initializer
)
1046 assign
= assign_expression(symbol
, sym
->initializer
);
1048 assign
= assign_expression(symbol
, zero_expr());
1049 __pass_to_client(assign
, GLOBAL_ASSIGNMENT_HOOK
);
1053 static void start_function_definition(struct symbol
*sym
)
1055 __in_function_def
= 1;
1056 __pass_to_client(sym
, FUNC_DEF_HOOK
);
1057 __in_function_def
= 0;
1058 __pass_to_client(sym
, AFTER_DEF_HOOK
);
1062 static void split_function(struct symbol
*sym
)
1064 struct symbol
*base_type
= get_base_type(sym
);
1066 gettimeofday(&fn_start_time
, NULL
);
1069 cur_func
= sym
->ident
->name
;
1070 __smatch_lineno
= sym
->pos
.line
;
1072 sm_debug("new function: %s\n", cur_func
);
1074 if (option_two_passes
) {
1078 start_function_definition(sym
);
1079 __split_stmt(base_type
->stmt
);
1080 __split_stmt(base_type
->inline_stmt
);
1086 start_function_definition(sym
);
1087 __split_stmt(base_type
->stmt
);
1088 __split_stmt(base_type
->inline_stmt
);
1089 __pass_to_client(sym
, END_FUNC_HOOK
);
1090 __pass_to_client(sym
, AFTER_FUNC_HOOK
);
1092 cur_func_sym
= NULL
;
1095 free_data_info_allocs();
1096 free_expression_stack(&switch_expr_stack
);
1097 __free_ptr_list((struct ptr_list
**)&big_statement_stack
);
1098 __bail_on_rest_of_function
= 0;
1101 static void parse_inline(struct expression
*call
)
1103 struct symbol
*base_type
;
1104 int loop_num_bak
= loop_num
;
1105 int final_pass_bak
= final_pass
;
1106 char *cur_func_bak
= cur_func
;
1107 struct statement_list
*big_statement_stack_bak
= big_statement_stack
;
1108 struct expression_list
*big_expression_stack_bak
= big_expression_stack
;
1109 struct expression_list
*switch_expr_stack_bak
= switch_expr_stack
;
1110 struct symbol
*cur_func_sym_bak
= cur_func_sym
;
1112 __pass_to_client(call
, INLINE_FN_START
);
1113 final_pass
= 0; /* don't print anything */
1116 base_type
= get_base_type(call
->fn
->symbol
);
1117 cur_func_sym
= call
->fn
->symbol
;
1118 if (call
->fn
->symbol
->ident
)
1119 cur_func
= call
->fn
->symbol
->ident
->name
;
1122 set_position(call
->fn
->symbol
->pos
);
1125 big_statement_stack
= NULL
;
1126 big_expression_stack
= NULL
;
1127 switch_expr_stack
= NULL
;
1129 sm_debug("inline function: %s\n", cur_func
);
1132 start_function_definition(call
->fn
->symbol
);
1133 __split_stmt(base_type
->stmt
);
1134 __split_stmt(base_type
->inline_stmt
);
1135 __pass_to_client(call
->fn
->symbol
, END_FUNC_HOOK
);
1136 __pass_to_client(call
->fn
->symbol
, AFTER_FUNC_HOOK
);
1138 free_expression_stack(&switch_expr_stack
);
1139 __free_ptr_list((struct ptr_list
**)&big_statement_stack
);
1143 loop_num
= loop_num_bak
;
1144 final_pass
= final_pass_bak
;
1145 cur_func_sym
= cur_func_sym_bak
;
1146 cur_func
= cur_func_bak
;
1147 big_statement_stack
= big_statement_stack_bak
;
1148 big_expression_stack
= big_expression_stack_bak
;
1149 switch_expr_stack
= switch_expr_stack_bak
;
1151 restore_all_states();
1152 set_position(call
->pos
);
1154 __pass_to_client(call
, INLINE_FN_END
);
1157 static struct symbol_list
*inlines_called
;
1158 static void add_inline_function(struct symbol
*sym
)
1160 static struct symbol_list
*already_added
;
1163 FOR_EACH_PTR(already_added
, tmp
) {
1166 } END_FOR_EACH_PTR(tmp
);
1168 add_ptr_list(&already_added
, sym
);
1169 add_ptr_list(&inlines_called
, sym
);
1172 static void process_inlines()
1176 FOR_EACH_PTR(inlines_called
, tmp
) {
1177 split_function(tmp
);
1178 } END_FOR_EACH_PTR(tmp
);
1179 free_ptr_list(&inlines_called
);
1182 static struct symbol
*get_last_scoped_symbol(struct symbol_list
*big_list
, int use_static
)
1186 FOR_EACH_PTR_REVERSE(big_list
, sym
) {
1189 if (use_static
&& sym
->ctype
.modifiers
& MOD_STATIC
)
1191 if (!use_static
&& !(sym
->ctype
.modifiers
& MOD_STATIC
))
1193 } END_FOR_EACH_PTR_REVERSE(sym
);
1198 static void split_inlines_in_scope(struct symbol
*sym
)
1200 struct symbol
*base
;
1201 struct symbol_list
*scope_list
;
1204 scope_list
= sym
->scope
->symbols
;
1205 stream
= sym
->pos
.stream
;
1207 /* find the last static symbol in the file */
1208 FOR_EACH_PTR_REVERSE(scope_list
, sym
) {
1209 if (sym
->pos
.stream
!= stream
)
1211 if (sym
->type
!= SYM_NODE
)
1213 base
= get_base_type(sym
);
1216 if (base
->type
!= SYM_FN
)
1218 if (!base
->inline_stmt
)
1220 add_inline_function(sym
);
1221 } END_FOR_EACH_PTR_REVERSE(sym
);
1226 static void split_inlines(struct symbol_list
*sym_list
)
1230 sym
= get_last_scoped_symbol(sym_list
, 0);
1232 split_inlines_in_scope(sym
);
1233 sym
= get_last_scoped_symbol(sym_list
, 1);
1235 split_inlines_in_scope(sym
);
1238 static void split_functions(struct symbol_list
*sym_list
)
1242 FOR_EACH_PTR(sym_list
, sym
) {
1243 set_position(sym
->pos
);
1244 if (sym
->type
== SYM_NODE
&& get_base_type(sym
)->type
== SYM_FN
) {
1245 split_function(sym
);
1248 __pass_to_client(sym
, BASE_HOOK
);
1249 fake_global_assign(sym
);
1251 } END_FOR_EACH_PTR(sym
);
1252 split_inlines(sym_list
);
1253 __pass_to_client(sym_list
, END_FILE_HOOK
);
1256 void smatch(int argc
, char **argv
)
1259 struct string_list
*filelist
= NULL
;
1260 struct symbol_list
*sym_list
;
1263 printf("Usage: smatch [--debug] <filename.c>\n");
1266 sparse_initialize(argc
, argv
, &filelist
);
1267 FOR_EACH_PTR_NOTAG(filelist
, base_file
) {
1268 if (option_file_output
) {
1271 snprintf(buf
, sizeof(buf
), "%s.smatch", base_file
);
1272 sm_outfd
= fopen(buf
, "w");
1274 printf("Error: Cannot open %s\n", base_file
);
1278 sym_list
= sparse_keep_tokens(base_file
);
1279 split_functions(sym_list
);
1280 } END_FOR_EACH_PTR_NOTAG(base_file
);