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"
29 static int in_fake_env
;
32 struct expression
*__inline_fn
;
34 static int __smatch_lineno
= 0;
36 static char *base_file
;
37 static const char *filename
;
38 static char *pathname
;
39 static char *full_filename
;
40 static char *cur_func
;
41 static unsigned int loop_count
;
42 static int last_goto_statement_handled
;
43 int __expr_stmt_count
;
44 int __in_function_def
;
45 static struct expression_list
*switch_expr_stack
= NULL
;
46 static struct expression_list
*post_op_stack
= NULL
;
48 struct expression_list
*big_expression_stack
;
49 struct statement_list
*big_statement_stack
;
50 struct statement
*__prev_stmt
;
51 struct statement
*__cur_stmt
;
52 struct statement
*__next_stmt
;
53 int __in_pre_condition
= 0;
54 int __bail_on_rest_of_function
= 0;
55 static struct timeval fn_start_time
;
56 char *get_function(void) { return cur_func
; }
57 int get_lineno(void) { return __smatch_lineno
; }
58 int inside_loop(void) { return !!loop_count
; }
59 int definitely_inside_loop(void) { return !!(loop_count
& ~0x80000000); }
60 struct expression
*get_switch_expr(void) { return top_expression(switch_expr_stack
); }
61 int in_expression_statement(void) { return !!__expr_stmt_count
; }
63 static void split_symlist(struct symbol_list
*sym_list
);
64 static void split_declaration(struct symbol_list
*sym_list
);
65 static void split_expr_list(struct expression_list
*expr_list
, struct expression
*parent
);
66 static void add_inline_function(struct symbol
*sym
);
67 static void parse_inline(struct expression
*expr
);
69 int option_assume_loops
= 0;
70 int option_two_passes
= 0;
71 struct symbol
*cur_func_sym
= NULL
;
72 struct stree
*global_states
;
74 long long valid_ptr_min
= 4096;
75 long long valid_ptr_max
= 2117777777;
76 sval_t valid_ptr_min_sval
= {
80 sval_t valid_ptr_max_sval
= {
82 {.value
= LONG_MAX
- 100000},
85 static void set_valid_ptr_max(void)
87 if (type_bits(&ptr_ctype
) == 32)
88 valid_ptr_max
= 2117777777;
89 else if (type_bits(&ptr_ctype
) == 64)
90 valid_ptr_max
= 2117777777777777777LL;
92 valid_ptr_max_sval
.value
= valid_ptr_max
;
95 int outside_of_function(void)
97 return cur_func_sym
== NULL
;
100 const char *get_filename(void)
104 if (option_full_path
)
105 return full_filename
;
109 const char *get_base_file(void)
114 static void set_position(struct position pos
)
117 static int prev_stream
= -1;
122 if (pos
.stream
== 0 && pos
.line
== 0)
125 __smatch_lineno
= pos
.line
;
127 if (pos
.stream
== prev_stream
)
130 filename
= stream_name(pos
.stream
);
133 pathname
= getcwd(NULL
, 0);
135 len
= strlen(pathname
) + 1 + strlen(filename
) + 1;
136 full_filename
= malloc(len
);
137 snprintf(full_filename
, len
, "%s/%s", pathname
, filename
);
139 full_filename
= alloc_string(filename
);
144 void set_parent_expr(struct expression
*expr
, struct expression
*parent
)
148 expr
->parent
= parent
;
151 static void set_parent_stmt(struct statement
*stmt
, struct statement
*parent
)
155 stmt
->parent
= parent
;
158 int is_assigned_call(struct expression
*expr
)
161 expr
->parent
->type
== EXPR_ASSIGNMENT
&&
162 expr
->parent
->op
== '=' &&
163 strip_expr(expr
->parent
->right
) == expr
)
169 static int is_inline_func(struct expression
*expr
)
171 if (expr
->type
!= EXPR_SYMBOL
|| !expr
->symbol
)
173 if (expr
->symbol
->ctype
.modifiers
& MOD_INLINE
)
178 static int is_noreturn_func(struct expression
*expr
)
180 if (expr
->type
!= EXPR_SYMBOL
|| !expr
->symbol
)
182 if (expr
->symbol
->ctype
.modifiers
& MOD_NORETURN
)
187 int inlinable(struct expression
*expr
)
190 struct statement
*last_stmt
= NULL
;
192 if (__inline_fn
) /* don't nest */
195 if (expr
->type
!= EXPR_SYMBOL
|| !expr
->symbol
)
197 if (is_no_inline_function(expr
->symbol
->ident
->name
))
199 sym
= get_base_type(expr
->symbol
);
200 if (sym
->stmt
&& sym
->stmt
->type
== STMT_COMPOUND
) {
201 if (ptr_list_size((struct ptr_list
*)sym
->stmt
->stmts
) > 10)
203 if (sym
->stmt
->type
!= STMT_COMPOUND
)
205 last_stmt
= last_ptr_list((struct ptr_list
*)sym
->stmt
->stmts
);
207 if (sym
->inline_stmt
&& sym
->inline_stmt
->type
== STMT_COMPOUND
) {
208 if (ptr_list_size((struct ptr_list
*)sym
->inline_stmt
->stmts
) > 10)
210 if (sym
->inline_stmt
->type
!= STMT_COMPOUND
)
212 last_stmt
= last_ptr_list((struct ptr_list
*)sym
->inline_stmt
->stmts
);
218 /* the magic numbers in this function are pulled out of my bum. */
219 if (last_stmt
->pos
.line
> sym
->pos
.line
+ 20)
225 void __process_post_op_stack(void)
227 struct expression
*expr
;
229 FOR_EACH_PTR(post_op_stack
, expr
) {
230 __pass_to_client(expr
, OP_HOOK
);
231 } END_FOR_EACH_PTR(expr
);
233 __free_ptr_list((struct ptr_list
**)&post_op_stack
);
236 static int handle_comma_assigns(struct expression
*expr
)
238 struct expression
*right
;
239 struct expression
*assign
;
241 right
= strip_expr(expr
->right
);
242 if (right
->type
!= EXPR_COMMA
)
245 __split_expr(right
->left
);
246 __process_post_op_stack();
248 assign
= assign_expression(expr
->left
, right
->right
);
249 __split_expr(assign
);
254 /* This is to handle *p++ = foo; assignments */
255 static int handle_postop_assigns(struct expression
*expr
)
257 struct expression
*left
, *fake_left
;
258 struct expression
*assign
;
260 left
= strip_expr(expr
->left
);
261 if (left
->type
!= EXPR_PREOP
|| left
->op
!= '*')
263 left
= strip_expr(left
->unop
);
264 if (left
->type
!= EXPR_POSTOP
)
267 fake_left
= deref_expression(strip_expr(left
->unop
));
268 assign
= assign_expression(fake_left
, expr
->right
);
270 __split_expr(assign
);
271 __split_expr(expr
->left
);
276 static int prev_expression_is_getting_address(struct expression
*expr
)
278 struct expression
*parent
;
281 parent
= expr
->parent
;
285 if (parent
->type
== EXPR_PREOP
&& parent
->op
== '&')
287 if (parent
->type
== EXPR_PREOP
&& parent
->op
== '(')
289 if (parent
->type
== EXPR_DEREF
&& parent
->op
== '.')
298 void __split_expr(struct expression
*expr
)
303 // sm_msg(" Debug expr_type %d %s", expr->type, show_special(expr->op));
305 if (__in_fake_assign
&& expr
->type
!= EXPR_ASSIGNMENT
)
307 if (__in_fake_assign
>= 4) /* don't allow too much nesting */
310 push_expression(&big_expression_stack
, expr
);
311 set_position(expr
->pos
);
312 __pass_to_client(expr
, EXPR_HOOK
);
314 switch (expr
->type
) {
316 set_parent_expr(expr
->unop
, expr
);
318 if (expr
->op
== '*' &&
319 !prev_expression_is_getting_address(expr
))
320 __pass_to_client(expr
, DEREF_HOOK
);
321 __split_expr(expr
->unop
);
322 __pass_to_client(expr
, OP_HOOK
);
325 set_parent_expr(expr
->unop
, expr
);
327 __split_expr(expr
->unop
);
328 push_expression(&post_op_stack
, expr
);
332 if (expr
->statement
&& !expr
->statement
->parent
) {
333 set_parent_stmt(expr
->statement
,
334 last_ptr_list((struct ptr_list
*)big_statement_stack
));
336 __split_stmt(expr
->statement
);
341 set_parent_expr(expr
->left
, expr
);
342 set_parent_expr(expr
->right
, expr
);
344 __pass_to_client(expr
, LOGIC_HOOK
);
345 __handle_logic(expr
);
348 set_parent_expr(expr
->left
, expr
);
349 set_parent_expr(expr
->right
, expr
);
351 __pass_to_client(expr
, BINOP_HOOK
);
353 set_parent_expr(expr
->left
, expr
);
354 set_parent_expr(expr
->right
, expr
);
356 __split_expr(expr
->left
);
357 __process_post_op_stack();
358 __split_expr(expr
->right
);
360 case EXPR_ASSIGNMENT
: {
361 struct expression
*right
;
363 set_parent_expr(expr
->left
, expr
);
364 set_parent_expr(expr
->right
, expr
);
369 right
= strip_expr(expr
->right
);
371 __pass_to_client(expr
, RAW_ASSIGNMENT_HOOK
);
374 if (__handle_condition_assigns(expr
))
376 /* foo = (x < 5 ? foo : 5); */
377 if (__handle_select_assigns(expr
))
379 /* foo = ({frob(); frob(); frob(); 1;}) */
380 if (__handle_expr_statement_assigns(expr
))
383 if (handle_comma_assigns(expr
))
385 if (handle_postop_assigns(expr
))
388 __split_expr(expr
->right
);
389 if (outside_of_function())
390 __pass_to_client(expr
, GLOBAL_ASSIGNMENT_HOOK
);
392 __pass_to_client(expr
, ASSIGNMENT_HOOK
);
394 __fake_struct_member_assignments(expr
);
396 if (expr
->op
== '=' && right
->type
== EXPR_CALL
)
397 __pass_to_client(expr
, CALL_ASSIGNMENT_HOOK
);
399 if (get_macro_name(right
->pos
) &&
400 get_macro_name(expr
->pos
) != get_macro_name(right
->pos
))
401 __pass_to_client(expr
, MACRO_ASSIGNMENT_HOOK
);
403 __pass_to_client(expr
, ASSIGNMENT_HOOK_AFTER
);
405 __split_expr(expr
->left
);
409 set_parent_expr(expr
->deref
, expr
);
411 __pass_to_client(expr
, DEREF_HOOK
);
412 __split_expr(expr
->deref
);
415 set_parent_expr(expr
->base
, expr
);
417 __split_expr(expr
->base
);
420 case EXPR_FORCE_CAST
:
421 set_parent_expr(expr
->cast_expression
, expr
);
423 __pass_to_client(expr
, CAST_HOOK
);
424 __split_expr(expr
->cast_expression
);
427 if (expr
->cast_expression
)
428 __pass_to_client(strip_parens(expr
->cast_expression
),
433 evaluate_expression(expr
);
435 case EXPR_CONDITIONAL
:
437 set_parent_expr(expr
->conditional
, expr
);
438 set_parent_expr(expr
->cond_true
, expr
);
439 set_parent_expr(expr
->cond_false
, expr
);
441 if (known_condition_true(expr
->conditional
)) {
442 __split_expr(expr
->cond_true
);
445 if (known_condition_false(expr
->conditional
)) {
446 __split_expr(expr
->cond_false
);
449 __pass_to_client(expr
, SELECT_HOOK
);
450 __split_whole_condition(expr
->conditional
);
451 __split_expr(expr
->cond_true
);
452 __push_true_states();
453 __use_false_states();
454 __split_expr(expr
->cond_false
);
455 __merge_true_states();
458 set_parent_expr(expr
->fn
, expr
);
460 if (sym_name_is("__builtin_constant_p", expr
->fn
))
462 split_expr_list(expr
->args
, expr
);
463 __split_expr(expr
->fn
);
464 if (is_inline_func(expr
->fn
))
465 add_inline_function(expr
->fn
->symbol
);
466 if (inlinable(expr
->fn
))
468 __process_post_op_stack();
469 __pass_to_client(expr
, FUNCTION_CALL_HOOK
);
471 if (inlinable(expr
->fn
)) {
474 __pass_to_client(expr
, CALL_HOOK_AFTER_INLINE
);
475 if (is_noreturn_func(expr
->fn
))
478 case EXPR_INITIALIZER
:
479 split_expr_list(expr
->expr_list
, expr
);
481 case EXPR_IDENTIFIER
:
482 set_parent_expr(expr
->ident_expression
, expr
);
483 __split_expr(expr
->ident_expression
);
486 set_parent_expr(expr
->idx_expression
, expr
);
487 __split_expr(expr
->idx_expression
);
490 set_parent_expr(expr
->init_expr
, expr
);
491 __split_expr(expr
->init_expr
);
494 __pass_to_client(expr
, SYM_HOOK
);
497 __pass_to_client(expr
, STRING_HOOK
);
502 pop_expression(&big_expression_stack
);
505 static int is_forever_loop(struct statement
*stmt
)
507 struct expression
*expr
;
510 expr
= strip_expr(stmt
->iterator_pre_condition
);
512 expr
= stmt
->iterator_post_condition
;
514 /* this is a for(;;) loop... */
518 if (get_value(expr
, &sval
) && sval
.value
!= 0)
525 static char *get_loop_name(int num
)
529 snprintf(buf
, 255, "-loop%d", num
);
531 return alloc_sname(buf
);
535 * Pre Loops are while and for loops.
537 static void handle_pre_loop(struct statement
*stmt
)
539 int once_through
; /* we go through the loop at least once */
540 struct sm_state
*extra_sm
= NULL
;
543 struct stree
*stree
= NULL
;
544 struct sm_state
*sm
= NULL
;
546 loop_name
= get_loop_name(loop_num
);
549 __split_stmt(stmt
->iterator_pre_statement
);
550 __prev_stmt
= stmt
->iterator_pre_statement
;
552 once_through
= implied_condition_true(stmt
->iterator_pre_condition
);
558 __merge_gotos(loop_name
, NULL
);
560 extra_sm
= __extra_handle_canonical_loops(stmt
, &stree
);
561 __in_pre_condition
++;
562 __pass_to_client(stmt
, PRELOOP_HOOK
);
563 __split_whole_condition(stmt
->iterator_pre_condition
);
564 __in_pre_condition
--;
565 FOR_EACH_SM(stree
, sm
) {
566 set_state(sm
->owner
, sm
->name
, sm
->sym
, sm
->state
);
567 } END_FOR_EACH_SM(sm
);
570 extra_sm
= get_sm_state(extra_sm
->owner
, extra_sm
->name
, extra_sm
->sym
);
572 if (option_assume_loops
)
575 __split_stmt(stmt
->iterator_statement
);
576 if (is_forever_loop(stmt
)) {
578 __save_gotos(loop_name
, NULL
);
580 __push_fake_cur_stree();
581 __split_stmt(stmt
->iterator_post_statement
);
582 stree
= __pop_fake_cur_stree();
584 __discard_false_states();
587 if (!__path_is_null())
588 __merge_stree_into_cur(stree
);
592 unchanged
= __iterator_unchanged(extra_sm
);
593 __split_stmt(stmt
->iterator_post_statement
);
594 __prev_stmt
= stmt
->iterator_post_statement
;
597 __save_gotos(loop_name
, NULL
);
598 __in_pre_condition
++;
599 __split_whole_condition(stmt
->iterator_pre_condition
);
600 __in_pre_condition
--;
602 __merge_false_states();
604 __discard_false_states();
606 __merge_false_states();
608 if (extra_sm
&& unchanged
)
609 __extra_pre_loop_hook_after(extra_sm
,
610 stmt
->iterator_post_statement
,
611 stmt
->iterator_pre_condition
);
618 * Post loops are do {} while();
620 static void handle_post_loop(struct statement
*stmt
)
624 loop_name
= get_loop_name(loop_num
);
630 __merge_gotos(loop_name
, NULL
);
631 __split_stmt(stmt
->iterator_statement
);
633 if (!is_zero(stmt
->iterator_post_condition
))
634 __save_gotos(loop_name
, NULL
);
636 if (is_forever_loop(stmt
)) {
639 __split_whole_condition(stmt
->iterator_post_condition
);
640 __use_false_states();
646 static int empty_statement(struct statement
*stmt
)
650 if (stmt
->type
== STMT_EXPRESSION
&& !stmt
->expression
)
655 static int last_stmt_on_same_line(void)
657 struct statement
*stmt
;
660 FOR_EACH_PTR_REVERSE(big_statement_stack
, stmt
) {
663 if (stmt
->pos
.line
== get_lineno())
666 } END_FOR_EACH_PTR_REVERSE(stmt
);
670 static void split_asm_constraints(struct expression_list
*expr_list
)
672 struct expression
*expr
;
675 FOR_EACH_PTR(expr_list
, expr
) {
677 case 0: /* identifier */
678 case 1: /* constraint */
681 case 2: /* expression */
686 } END_FOR_EACH_PTR(expr
);
689 static int is_case_val(struct statement
*stmt
, sval_t sval
)
693 if (stmt
->type
!= STMT_CASE
)
695 if (!stmt
->case_expression
) {
699 if (!get_value(stmt
->case_expression
, &case_sval
))
701 if (case_sval
.value
== sval
.value
)
706 static struct range_list
*get_case_rl(struct expression
*switch_expr
,
707 struct expression
*case_expr
,
708 struct expression
*case_to
)
711 struct range_list
*rl
= NULL
;
712 struct symbol
*switch_type
;
714 switch_type
= get_type(switch_expr
);
715 if (get_value(case_to
, &end
) && get_value(case_expr
, &start
)) {
716 start
= sval_cast(switch_type
, start
);
717 end
= sval_cast(switch_type
, end
);
718 add_range(&rl
, start
, end
);
719 } else if (get_value(case_expr
, &start
)) {
720 start
= sval_cast(switch_type
, start
);
721 add_range(&rl
, start
, start
);
727 static void split_known_switch(struct statement
*stmt
, sval_t sval
)
729 struct statement
*tmp
;
730 struct range_list
*rl
;
732 __split_expr(stmt
->switch_expression
);
733 sval
= sval_cast(get_type(stmt
->switch_expression
), sval
);
735 push_expression(&switch_expr_stack
, stmt
->switch_expression
);
736 __save_switch_states(top_expression(switch_expr_stack
));
741 stmt
= stmt
->switch_statement
;
743 __push_scope_hooks();
744 FOR_EACH_PTR(stmt
->stmts
, tmp
) {
745 __smatch_lineno
= tmp
->pos
.line
;
746 if (is_case_val(tmp
, sval
)) {
747 rl
= alloc_rl(sval
, sval
);
748 __merge_switches(top_expression(switch_expr_stack
), rl
);
749 __pass_case_to_client(top_expression(switch_expr_stack
), rl
);
751 if (__path_is_null())
754 if (__path_is_null()) {
758 } END_FOR_EACH_PTR(tmp
);
760 __call_scope_hooks();
761 if (!__pop_default())
762 __merge_switches(top_expression(switch_expr_stack
), NULL
);
763 __discard_switches();
765 pop_expression(&switch_expr_stack
);
768 static void split_case(struct statement
*stmt
)
770 struct range_list
*rl
= NULL
;
772 rl
= get_case_rl(top_expression(switch_expr_stack
),
773 stmt
->case_expression
, stmt
->case_to
);
774 while (stmt
->case_statement
->type
== STMT_CASE
) {
775 struct range_list
*tmp
;
777 tmp
= get_case_rl(top_expression(switch_expr_stack
),
778 stmt
->case_statement
->case_expression
,
779 stmt
->case_statement
->case_to
);
782 rl
= rl_union(rl
, tmp
);
783 if (!stmt
->case_expression
)
785 stmt
= stmt
->case_statement
;
788 __merge_switches(top_expression(switch_expr_stack
), rl
);
790 if (!stmt
->case_expression
)
792 __split_stmt(stmt
->case_statement
);
795 static int taking_too_long(void)
799 ms
= ms_since(&fn_start_time
);
800 if (ms
> 1000 * 60 * 5) /* five minutes */
805 static int is_last_stmt(struct statement
*cur_stmt
)
807 struct symbol
*fn
= get_base_type(cur_func_sym
);
808 struct statement
*stmt
;
814 stmt
= fn
->inline_stmt
;
815 if (!stmt
|| stmt
->type
!= STMT_COMPOUND
)
817 stmt
= last_ptr_list((struct ptr_list
*)stmt
->stmts
);
818 if (stmt
&& stmt
->type
== STMT_LABEL
)
819 stmt
= stmt
->label_statement
;
820 if (stmt
== cur_stmt
)
825 static void handle_backward_goto(struct statement
*goto_stmt
)
827 const char *goto_name
, *label_name
;
828 struct statement
*func_stmt
;
829 struct symbol
*base_type
= get_base_type(cur_func_sym
);
830 struct statement
*tmp
;
835 if (last_goto_statement_handled
)
837 last_goto_statement_handled
= 1;
839 if (!goto_stmt
->goto_label
||
840 goto_stmt
->goto_label
->type
!= SYM_LABEL
||
841 !goto_stmt
->goto_label
->ident
)
843 goto_name
= goto_stmt
->goto_label
->ident
->name
;
845 func_stmt
= base_type
->stmt
;
847 func_stmt
= base_type
->inline_stmt
;
850 if (func_stmt
->type
!= STMT_COMPOUND
)
853 FOR_EACH_PTR(func_stmt
->stmts
, tmp
) {
855 if (tmp
->type
!= STMT_LABEL
)
857 if (!tmp
->label_identifier
||
858 tmp
->label_identifier
->type
!= SYM_LABEL
||
859 !tmp
->label_identifier
->ident
)
861 label_name
= tmp
->label_identifier
->ident
->name
;
862 if (strcmp(goto_name
, label_name
) != 0)
867 } END_FOR_EACH_PTR(tmp
);
870 static void fake_a_return(void)
872 struct symbol
*return_type
;
877 return_type
= get_real_base_type(cur_func_sym
);
878 return_type
= get_real_base_type(return_type
);
879 if (return_type
!= &void_ctype
) {
880 __pass_to_client(unknown_value_expression(NULL
), RETURN_HOOK
);
885 static void fake_an_empty_default(struct position pos
)
887 static struct statement none
= {};
890 none
.type
= STMT_NONE
;
891 __merge_switches(top_expression(switch_expr_stack
), NULL
);
895 static void split_compound(struct statement
*stmt
)
897 struct statement
*prev
= NULL
;
898 struct statement
*cur
= NULL
;
899 struct statement
*next
;
901 __push_scope_hooks();
903 FOR_EACH_PTR(stmt
->stmts
, next
) {
904 /* just set them all ahead of time */
905 set_parent_stmt(next
, stmt
);
915 } END_FOR_EACH_PTR(next
);
924 * For function scope, then delay calling the scope hooks until the
925 * end of function hooks can run. I'm not positive this is the right
928 if (!is_last_stmt(cur
))
929 __call_scope_hooks();
933 * This is a hack, work around for detecting empty functions.
935 static int need_delayed_scope_hooks(void)
937 struct symbol
*fn
= get_base_type(cur_func_sym
);
938 struct statement
*stmt
;
944 stmt
= fn
->inline_stmt
;
945 if (stmt
&& stmt
->type
== STMT_COMPOUND
)
950 void __split_label_stmt(struct statement
*stmt
)
952 if (stmt
->label_identifier
&&
953 stmt
->label_identifier
->type
== SYM_LABEL
&&
954 stmt
->label_identifier
->ident
) {
955 loop_count
|= 0x80000000;
956 __merge_gotos(stmt
->label_identifier
->ident
->name
, stmt
->label_identifier
);
960 static void find_asm_gotos(struct statement
*stmt
)
964 FOR_EACH_PTR(stmt
->asm_labels
, sym
) {
965 __save_gotos(sym
->ident
->name
, sym
);
966 } END_FOR_EACH_PTR(sym
);
969 void __split_stmt(struct statement
*stmt
)
976 if (__bail_on_rest_of_function
)
979 if (out_of_memory() || taking_too_long()) {
981 __bail_on_rest_of_function
= 1;
983 sm_msg("Function too hairy. Giving up.");
985 final_pass
= 0; /* turn off sm_msg() from here */
989 add_ptr_list(&big_statement_stack
, stmt
);
990 free_expression_stack(&big_expression_stack
);
991 set_position(stmt
->pos
);
992 __pass_to_client(stmt
, STMT_HOOK
);
994 switch (stmt
->type
) {
995 case STMT_DECLARATION
:
996 split_declaration(stmt
->declaration
);
999 __split_expr(stmt
->ret_value
);
1000 __pass_to_client(stmt
->ret_value
, RETURN_HOOK
);
1001 __process_post_op_stack();
1004 case STMT_EXPRESSION
:
1005 __split_expr(stmt
->expression
);
1008 split_compound(stmt
);
1011 set_parent_stmt(stmt
->if_true
, stmt
);
1012 set_parent_stmt(stmt
->if_false
, stmt
);
1014 if (known_condition_true(stmt
->if_conditional
)) {
1015 __split_stmt(stmt
->if_true
);
1018 if (known_condition_false(stmt
->if_conditional
)) {
1019 __split_stmt(stmt
->if_false
);
1022 __split_whole_condition(stmt
->if_conditional
);
1023 __split_stmt(stmt
->if_true
);
1024 if (empty_statement(stmt
->if_true
) &&
1025 last_stmt_on_same_line() &&
1026 !get_macro_name(stmt
->if_true
->pos
))
1027 sm_msg("warn: if();");
1028 __push_true_states();
1029 __use_false_states();
1030 __split_stmt(stmt
->if_false
);
1031 __merge_true_states();
1034 set_parent_stmt(stmt
->iterator_pre_statement
, stmt
);
1035 set_parent_stmt(stmt
->iterator_statement
, stmt
);
1036 set_parent_stmt(stmt
->iterator_post_statement
, stmt
);
1038 if (stmt
->iterator_pre_condition
)
1039 handle_pre_loop(stmt
);
1040 else if (stmt
->iterator_post_condition
)
1041 handle_post_loop(stmt
);
1043 // these are for(;;) type loops.
1044 handle_pre_loop(stmt
);
1048 set_parent_stmt(stmt
->switch_statement
, stmt
);
1050 if (get_value(stmt
->switch_expression
, &sval
)) {
1051 split_known_switch(stmt
, sval
);
1054 __split_expr(stmt
->switch_expression
);
1055 push_expression(&switch_expr_stack
, stmt
->switch_expression
);
1056 __save_switch_states(top_expression(switch_expr_stack
));
1060 __split_stmt(stmt
->switch_statement
);
1061 if (!__pop_default())
1062 fake_an_empty_default(stmt
->pos
);
1063 __discard_switches();
1065 pop_expression(&switch_expr_stack
);
1071 __split_label_stmt(stmt
);
1072 __split_stmt(stmt
->label_statement
);
1075 __split_expr(stmt
->goto_expression
);
1076 if (stmt
->goto_label
&& stmt
->goto_label
->type
== SYM_NODE
) {
1077 if (!strcmp(stmt
->goto_label
->ident
->name
, "break")) {
1079 } else if (!strcmp(stmt
->goto_label
->ident
->name
,
1081 __process_continues();
1083 } else if (stmt
->goto_label
&&
1084 stmt
->goto_label
->type
== SYM_LABEL
&&
1085 stmt
->goto_label
->ident
) {
1086 __save_gotos(stmt
->goto_label
->ident
->name
, stmt
->goto_label
);
1089 if (is_last_stmt(stmt
))
1090 handle_backward_goto(stmt
);
1095 find_asm_gotos(stmt
);
1096 __pass_to_client(stmt
, ASM_HOOK
);
1097 __split_expr(stmt
->asm_string
);
1098 split_asm_constraints(stmt
->asm_outputs
);
1099 split_asm_constraints(stmt
->asm_inputs
);
1100 split_asm_constraints(stmt
->asm_clobbers
);
1105 __split_expr(stmt
->range_expression
);
1106 __split_expr(stmt
->range_low
);
1107 __split_expr(stmt
->range_high
);
1110 __pass_to_client(stmt
, STMT_HOOK_AFTER
);
1112 __process_post_op_stack();
1115 static void split_expr_list(struct expression_list
*expr_list
, struct expression
*parent
)
1117 struct expression
*expr
;
1119 FOR_EACH_PTR(expr_list
, expr
) {
1120 set_parent_expr(expr
, parent
);
1122 __process_post_op_stack();
1123 } END_FOR_EACH_PTR(expr
);
1126 static void split_sym(struct symbol
*sym
)
1130 if (!(sym
->namespace & NS_SYMBOL
))
1133 __split_stmt(sym
->stmt
);
1134 __split_expr(sym
->array_size
);
1135 split_symlist(sym
->arguments
);
1136 split_symlist(sym
->symbol_list
);
1137 __split_stmt(sym
->inline_stmt
);
1138 split_symlist(sym
->inline_symbol_list
);
1141 static void split_symlist(struct symbol_list
*sym_list
)
1145 FOR_EACH_PTR(sym_list
, sym
) {
1147 } END_FOR_EACH_PTR(sym
);
1150 typedef void (fake_cb
)(struct expression
*expr
);
1152 static int member_to_number(struct expression
*expr
, struct ident
*member
)
1154 struct symbol
*type
, *tmp
;
1160 name
= member
->name
;
1162 type
= get_type(expr
);
1163 if (!type
|| type
->type
!= SYM_STRUCT
)
1167 FOR_EACH_PTR(type
->symbol_list
, tmp
) {
1171 if (strcmp(name
, tmp
->ident
->name
) == 0)
1173 } END_FOR_EACH_PTR(tmp
);
1177 static struct ident
*number_to_member(struct expression
*expr
, int num
)
1179 struct symbol
*type
, *member
;
1182 type
= get_type(expr
);
1183 if (!type
|| type
->type
!= SYM_STRUCT
)
1186 FOR_EACH_PTR(type
->symbol_list
, member
) {
1188 return member
->ident
;
1190 } END_FOR_EACH_PTR(member
);
1194 static void fake_element_assigns_helper(struct expression
*array
, struct expression_list
*expr_list
, fake_cb
*fake_cb
);
1196 static void set_inner_struct_members(struct expression
*expr
, struct symbol
*member
)
1198 struct expression
*edge_member
, *assign
;
1199 struct symbol
*base
= get_real_base_type(member
);
1203 expr
= member_expression(expr
, '.', member
->ident
);
1205 FOR_EACH_PTR(base
->symbol_list
, tmp
) {
1206 struct symbol
*type
;
1208 type
= get_real_base_type(tmp
);
1212 edge_member
= member_expression(expr
, '.', tmp
->ident
);
1213 if (get_state_expr(SMATCH_EXTRA
, edge_member
))
1216 if (type
->type
== SYM_UNION
|| type
->type
== SYM_STRUCT
) {
1217 set_inner_struct_members(expr
, tmp
);
1224 assign
= assign_expression(edge_member
, zero_expr());
1225 __split_expr(assign
);
1226 } END_FOR_EACH_PTR(tmp
);
1231 static void set_unset_to_zero(struct symbol
*type
, struct expression
*expr
)
1234 struct expression
*member
= NULL
;
1235 struct expression
*assign
;
1238 if (expr
->type
== EXPR_PREOP
&& expr
->op
== '&') {
1239 expr
= strip_expr(expr
->unop
);
1243 FOR_EACH_PTR(type
->symbol_list
, tmp
) {
1244 type
= get_real_base_type(tmp
);
1249 member
= member_expression(expr
, op
, tmp
->ident
);
1250 if (get_state_expr(SMATCH_EXTRA
, member
))
1254 if (type
->type
== SYM_UNION
|| type
->type
== SYM_STRUCT
) {
1255 set_inner_struct_members(expr
, tmp
);
1258 if (type
->type
== SYM_ARRAY
)
1263 assign
= assign_expression(member
, zero_expr());
1264 __split_expr(assign
);
1265 } END_FOR_EACH_PTR(tmp
);
1268 static void fake_member_assigns_helper(struct expression
*symbol
, struct expression_list
*members
, fake_cb
*fake_cb
)
1270 struct expression
*deref
, *assign
, *tmp
, *right
;
1271 struct symbol
*struct_type
, *type
;
1272 struct ident
*member
;
1275 struct_type
= get_type(symbol
);
1277 (struct_type
->type
!= SYM_STRUCT
&& struct_type
->type
!= SYM_UNION
))
1281 * We're parsing an initializer that could look something like this:
1282 * struct foo foo = {
1284 * .whatever.xxx = 11,
1288 * So what we have here is a list with 42, .whatever, and .zzz. We need
1289 * to break it up into left and right sides of the assignments.
1293 FOR_EACH_PTR(members
, tmp
) {
1295 if (tmp
->type
== EXPR_IDENTIFIER
) {
1296 member_idx
= member_to_number(symbol
, tmp
->expr_ident
);
1297 while (tmp
->type
== EXPR_IDENTIFIER
) {
1298 member
= tmp
->expr_ident
;
1299 tmp
= tmp
->ident_expression
;
1301 deref
= member_expression(deref
, '.', member
);
1303 deref
= member_expression(symbol
, '.', member
);
1306 member
= number_to_member(symbol
, member_idx
);
1307 deref
= member_expression(symbol
, '.', member
);
1311 if (right
->type
== EXPR_INITIALIZER
) {
1312 type
= get_type(deref
);
1313 if (type
&& type
->type
== SYM_ARRAY
)
1314 fake_element_assigns_helper(deref
, right
->expr_list
, fake_cb
);
1316 fake_member_assigns_helper(deref
, right
->expr_list
, fake_cb
);
1318 assign
= assign_expression(deref
, right
);
1321 } END_FOR_EACH_PTR(tmp
);
1323 set_unset_to_zero(struct_type
, symbol
);
1326 static void fake_member_assigns(struct symbol
*sym
, fake_cb
*fake_cb
)
1328 fake_member_assigns_helper(symbol_expression(sym
),
1329 sym
->initializer
->expr_list
, fake_cb
);
1332 static void fake_element_assigns_helper(struct expression
*array
, struct expression_list
*expr_list
, fake_cb
*fake_cb
)
1334 struct expression
*offset
, *binop
, *assign
, *tmp
;
1335 struct symbol
*type
;
1338 if (ptr_list_size((struct ptr_list
*)expr_list
) > 1000)
1342 FOR_EACH_PTR(expr_list
, tmp
) {
1343 if (tmp
->type
== EXPR_INDEX
) {
1344 if (tmp
->idx_from
!= tmp
->idx_to
)
1346 idx
= tmp
->idx_from
;
1347 if (!tmp
->idx_expression
)
1349 tmp
= tmp
->idx_expression
;
1351 offset
= value_expr(idx
);
1352 binop
= array_element_expression(array
, offset
);
1353 if (tmp
->type
== EXPR_INITIALIZER
) {
1354 type
= get_type(binop
);
1355 if (type
&& type
->type
== SYM_ARRAY
)
1356 fake_element_assigns_helper(binop
, tmp
->expr_list
, fake_cb
);
1358 fake_member_assigns_helper(binop
, tmp
->expr_list
, fake_cb
);
1360 assign
= assign_expression(binop
, tmp
);
1365 } END_FOR_EACH_PTR(tmp
);
1368 static void fake_element_assigns(struct symbol
*sym
, fake_cb
*fake_cb
)
1370 fake_element_assigns_helper(symbol_expression(sym
), sym
->initializer
->expr_list
, fake_cb
);
1373 static void fake_assign_expr(struct symbol
*sym
)
1375 struct expression
*assign
, *symbol
;
1377 symbol
= symbol_expression(sym
);
1378 assign
= assign_expression(symbol
, sym
->initializer
);
1379 __split_expr(assign
);
1382 static void call_split_expr(struct expression
*expr
)
1387 static void do_initializer_stuff(struct symbol
*sym
)
1389 if (!sym
->initializer
)
1392 if (sym
->initializer
->type
== EXPR_INITIALIZER
) {
1393 if (get_real_base_type(sym
)->type
== SYM_ARRAY
)
1394 fake_element_assigns(sym
, call_split_expr
);
1396 fake_member_assigns(sym
, call_split_expr
);
1398 fake_assign_expr(sym
);
1402 static void split_declaration(struct symbol_list
*sym_list
)
1406 FOR_EACH_PTR(sym_list
, sym
) {
1407 __pass_to_client(sym
, DECLARATION_HOOK
);
1408 do_initializer_stuff(sym
);
1410 } END_FOR_EACH_PTR(sym
);
1413 static void call_global_assign_hooks(struct expression
*assign
)
1415 __pass_to_client(assign
, GLOBAL_ASSIGNMENT_HOOK
);
1418 static void fake_global_assign(struct symbol
*sym
)
1420 struct expression
*assign
, *symbol
;
1422 if (get_real_base_type(sym
)->type
== SYM_ARRAY
) {
1423 if (sym
->initializer
&& sym
->initializer
->type
== EXPR_INITIALIZER
) {
1424 fake_element_assigns(sym
, call_global_assign_hooks
);
1425 } else if (sym
->initializer
) {
1426 symbol
= symbol_expression(sym
);
1427 assign
= assign_expression(symbol
, sym
->initializer
);
1428 __pass_to_client(assign
, GLOBAL_ASSIGNMENT_HOOK
);
1430 fake_element_assigns_helper(symbol_expression(sym
), NULL
, call_global_assign_hooks
);
1432 } else if (get_real_base_type(sym
)->type
== SYM_STRUCT
) {
1433 if (sym
->initializer
&& sym
->initializer
->type
== EXPR_INITIALIZER
) {
1434 fake_member_assigns(sym
, call_global_assign_hooks
);
1435 } else if (sym
->initializer
) {
1436 symbol
= symbol_expression(sym
);
1437 assign
= assign_expression(symbol
, sym
->initializer
);
1438 __pass_to_client(assign
, GLOBAL_ASSIGNMENT_HOOK
);
1440 fake_member_assigns_helper(symbol_expression(sym
), NULL
, call_global_assign_hooks
);
1443 symbol
= symbol_expression(sym
);
1444 if (sym
->initializer
)
1445 assign
= assign_expression(symbol
, sym
->initializer
);
1447 assign
= assign_expression(symbol
, zero_expr());
1448 __pass_to_client(assign
, GLOBAL_ASSIGNMENT_HOOK
);
1452 static void start_function_definition(struct symbol
*sym
)
1454 __in_function_def
= 1;
1455 __pass_to_client(sym
, FUNC_DEF_HOOK
);
1456 __in_function_def
= 0;
1457 __pass_to_client(sym
, AFTER_DEF_HOOK
);
1461 static void split_function(struct symbol
*sym
)
1463 struct symbol
*base_type
= get_base_type(sym
);
1465 if (!base_type
->stmt
&& !base_type
->inline_stmt
)
1468 gettimeofday(&fn_start_time
, NULL
);
1471 cur_func
= sym
->ident
->name
;
1472 set_position(sym
->pos
);
1474 last_goto_statement_handled
= 0;
1475 sm_debug("new function: %s\n", cur_func
);
1477 if (option_two_passes
) {
1481 start_function_definition(sym
);
1482 __split_stmt(base_type
->stmt
);
1483 __split_stmt(base_type
->inline_stmt
);
1489 start_function_definition(sym
);
1490 __split_stmt(base_type
->stmt
);
1491 __split_stmt(base_type
->inline_stmt
);
1492 __pass_to_client(sym
, END_FUNC_HOOK
);
1493 if (need_delayed_scope_hooks())
1494 __call_scope_hooks();
1495 __pass_to_client(sym
, AFTER_FUNC_HOOK
);
1498 cur_func_sym
= NULL
;
1500 free_data_info_allocs();
1501 free_expression_stack(&switch_expr_stack
);
1502 __free_ptr_list((struct ptr_list
**)&big_statement_stack
);
1503 __bail_on_rest_of_function
= 0;
1506 static void parse_inline(struct expression
*call
)
1508 struct symbol
*base_type
;
1509 int loop_num_bak
= loop_num
;
1510 int loop_count_bak
= loop_count
;
1511 int final_pass_bak
= final_pass
;
1512 char *cur_func_bak
= cur_func
;
1513 struct statement_list
*big_statement_stack_bak
= big_statement_stack
;
1514 struct expression_list
*big_expression_stack_bak
= big_expression_stack
;
1515 struct expression_list
*big_condition_stack_bak
= big_condition_stack
;
1516 struct expression_list
*switch_expr_stack_bak
= switch_expr_stack
;
1517 struct symbol
*cur_func_sym_bak
= cur_func_sym
;
1519 __pass_to_client(call
, INLINE_FN_START
);
1520 final_pass
= 0; /* don't print anything */
1523 base_type
= get_base_type(call
->fn
->symbol
);
1524 cur_func_sym
= call
->fn
->symbol
;
1525 if (call
->fn
->symbol
->ident
)
1526 cur_func
= call
->fn
->symbol
->ident
->name
;
1529 set_position(call
->fn
->symbol
->pos
);
1532 big_statement_stack
= NULL
;
1533 big_expression_stack
= NULL
;
1534 big_condition_stack
= NULL
;
1535 switch_expr_stack
= NULL
;
1537 sm_debug("inline function: %s\n", cur_func
);
1540 start_function_definition(call
->fn
->symbol
);
1541 __split_stmt(base_type
->stmt
);
1542 __split_stmt(base_type
->inline_stmt
);
1543 __pass_to_client(call
->fn
->symbol
, END_FUNC_HOOK
);
1544 __pass_to_client(call
->fn
->symbol
, AFTER_FUNC_HOOK
);
1546 free_expression_stack(&switch_expr_stack
);
1547 __free_ptr_list((struct ptr_list
**)&big_statement_stack
);
1551 loop_num
= loop_num_bak
;
1552 loop_count
= loop_count_bak
;
1553 final_pass
= final_pass_bak
;
1554 cur_func_sym
= cur_func_sym_bak
;
1555 cur_func
= cur_func_bak
;
1556 big_statement_stack
= big_statement_stack_bak
;
1557 big_expression_stack
= big_expression_stack_bak
;
1558 big_condition_stack
= big_condition_stack_bak
;
1559 switch_expr_stack
= switch_expr_stack_bak
;
1561 restore_all_states();
1562 set_position(call
->pos
);
1564 __pass_to_client(call
, INLINE_FN_END
);
1567 static struct symbol_list
*inlines_called
;
1568 static void add_inline_function(struct symbol
*sym
)
1570 static struct symbol_list
*already_added
;
1573 FOR_EACH_PTR(already_added
, tmp
) {
1576 } END_FOR_EACH_PTR(tmp
);
1578 add_ptr_list(&already_added
, sym
);
1579 add_ptr_list(&inlines_called
, sym
);
1582 static void process_inlines(void)
1586 FOR_EACH_PTR(inlines_called
, tmp
) {
1587 split_function(tmp
);
1588 } END_FOR_EACH_PTR(tmp
);
1589 free_ptr_list(&inlines_called
);
1592 static struct symbol
*get_last_scoped_symbol(struct symbol_list
*big_list
, int use_static
)
1596 FOR_EACH_PTR_REVERSE(big_list
, sym
) {
1599 if (use_static
&& sym
->ctype
.modifiers
& MOD_STATIC
)
1601 if (!use_static
&& !(sym
->ctype
.modifiers
& MOD_STATIC
))
1603 } END_FOR_EACH_PTR_REVERSE(sym
);
1608 static void split_inlines_in_scope(struct symbol
*sym
)
1610 struct symbol
*base
;
1611 struct symbol_list
*scope_list
;
1614 scope_list
= sym
->scope
->symbols
;
1615 stream
= sym
->pos
.stream
;
1617 /* find the last static symbol in the file */
1618 FOR_EACH_PTR_REVERSE(scope_list
, sym
) {
1619 if (sym
->pos
.stream
!= stream
)
1621 if (sym
->type
!= SYM_NODE
)
1623 base
= get_base_type(sym
);
1626 if (base
->type
!= SYM_FN
)
1628 if (!base
->inline_stmt
)
1630 add_inline_function(sym
);
1631 } END_FOR_EACH_PTR_REVERSE(sym
);
1636 static void split_inlines(struct symbol_list
*sym_list
)
1640 sym
= get_last_scoped_symbol(sym_list
, 0);
1642 split_inlines_in_scope(sym
);
1643 sym
= get_last_scoped_symbol(sym_list
, 1);
1645 split_inlines_in_scope(sym
);
1648 static struct stree
*clone_estates_perm(struct stree
*orig
)
1650 struct stree
*ret
= NULL
;
1651 struct sm_state
*tmp
;
1653 FOR_EACH_SM(orig
, tmp
) {
1654 set_state_stree_perm(&ret
, tmp
->owner
, tmp
->name
, tmp
->sym
, clone_estate_perm(tmp
->state
));
1655 } END_FOR_EACH_SM(tmp
);
1660 struct position last_pos
;
1661 static void split_functions(struct symbol_list
*sym_list
)
1666 FOR_EACH_PTR(sym_list
, sym
) {
1667 set_position(sym
->pos
);
1668 if (sym
->type
!= SYM_NODE
|| get_base_type(sym
)->type
!= SYM_FN
) {
1669 __pass_to_client(sym
, BASE_HOOK
);
1670 fake_global_assign(sym
);
1672 } END_FOR_EACH_PTR(sym
);
1673 global_states
= clone_estates_perm(get_all_states_stree(SMATCH_EXTRA
));
1676 FOR_EACH_PTR(sym_list
, sym
) {
1677 set_position(sym
->pos
);
1678 if (sym
->type
== SYM_NODE
&& get_base_type(sym
)->type
== SYM_FN
) {
1679 split_function(sym
);
1682 last_pos
= sym
->pos
;
1683 } END_FOR_EACH_PTR(sym
);
1684 split_inlines(sym_list
);
1685 __pass_to_client(sym_list
, END_FILE_HOOK
);
1688 static int final_before_fake
;
1689 void init_fake_env(void)
1692 final_before_fake
= final_pass
;
1694 __push_fake_cur_stree();
1698 void end_fake_env(void)
1700 __pop_fake_cur_stree();
1703 final_pass
= final_before_fake
;
1706 void smatch(int argc
, char **argv
)
1708 struct string_list
*filelist
= NULL
;
1709 struct symbol_list
*sym_list
;
1710 struct timeval stop
, start
;
1712 gettimeofday(&start
, NULL
);
1715 printf("Usage: smatch [--debug] <filename.c>\n");
1718 sparse_initialize(argc
, argv
, &filelist
);
1719 set_valid_ptr_max();
1720 FOR_EACH_PTR_NOTAG(filelist
, base_file
) {
1721 if (option_file_output
) {
1724 snprintf(buf
, sizeof(buf
), "%s.smatch", base_file
);
1725 sm_outfd
= fopen(buf
, "w");
1727 printf("Error: Cannot open %s\n", base_file
);
1731 sym_list
= sparse_keep_tokens(base_file
);
1732 split_functions(sym_list
);
1733 } END_FOR_EACH_PTR_NOTAG(base_file
);
1735 gettimeofday(&stop
, NULL
);
1737 set_position(last_pos
);
1739 sm_msg("time: %lu", stop
.tv_sec
- start
.tv_sec
);