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 int is_assigned_call(struct expression
*expr
)
146 struct expression
*parent
= expr_get_parent_expr(expr
);
149 parent
->type
== EXPR_ASSIGNMENT
&&
151 strip_expr(parent
->right
) == expr
)
157 static int is_inline_func(struct expression
*expr
)
159 if (expr
->type
!= EXPR_SYMBOL
|| !expr
->symbol
)
161 if (expr
->symbol
->ctype
.modifiers
& MOD_INLINE
)
166 static int is_noreturn_func(struct expression
*expr
)
168 if (expr
->type
!= EXPR_SYMBOL
|| !expr
->symbol
)
170 if (expr
->symbol
->ctype
.modifiers
& MOD_NORETURN
)
175 int inlinable(struct expression
*expr
)
178 struct statement
*last_stmt
= NULL
;
180 if (__inline_fn
) /* don't nest */
183 if (expr
->type
!= EXPR_SYMBOL
|| !expr
->symbol
)
185 if (is_no_inline_function(expr
->symbol
->ident
->name
))
187 sym
= get_base_type(expr
->symbol
);
188 if (sym
->stmt
&& sym
->stmt
->type
== STMT_COMPOUND
) {
189 if (ptr_list_size((struct ptr_list
*)sym
->stmt
->stmts
) > 10)
191 if (sym
->stmt
->type
!= STMT_COMPOUND
)
193 last_stmt
= last_ptr_list((struct ptr_list
*)sym
->stmt
->stmts
);
195 if (sym
->inline_stmt
&& sym
->inline_stmt
->type
== STMT_COMPOUND
) {
196 if (ptr_list_size((struct ptr_list
*)sym
->inline_stmt
->stmts
) > 10)
198 if (sym
->inline_stmt
->type
!= STMT_COMPOUND
)
200 last_stmt
= last_ptr_list((struct ptr_list
*)sym
->inline_stmt
->stmts
);
206 /* the magic numbers in this function are pulled out of my bum. */
207 if (last_stmt
->pos
.line
> sym
->pos
.line
+ 20)
213 void __process_post_op_stack(void)
215 struct expression
*expr
;
217 FOR_EACH_PTR(post_op_stack
, expr
) {
218 __pass_to_client(expr
, OP_HOOK
);
219 } END_FOR_EACH_PTR(expr
);
221 __free_ptr_list((struct ptr_list
**)&post_op_stack
);
224 static int handle_comma_assigns(struct expression
*expr
)
226 struct expression
*right
;
227 struct expression
*assign
;
229 right
= strip_expr(expr
->right
);
230 if (right
->type
!= EXPR_COMMA
)
233 __split_expr(right
->left
);
234 __process_post_op_stack();
236 assign
= assign_expression(expr
->left
, right
->right
);
237 __split_expr(assign
);
242 /* This is to handle *p++ = foo; assignments */
243 static int handle_postop_assigns(struct expression
*expr
)
245 struct expression
*left
, *fake_left
;
246 struct expression
*assign
;
248 left
= strip_expr(expr
->left
);
249 if (left
->type
!= EXPR_PREOP
|| left
->op
!= '*')
251 left
= strip_expr(left
->unop
);
252 if (left
->type
!= EXPR_POSTOP
)
255 fake_left
= deref_expression(strip_expr(left
->unop
));
256 assign
= assign_expression(fake_left
, expr
->right
);
258 __split_expr(assign
);
259 __split_expr(expr
->left
);
264 static int prev_expression_is_getting_address(struct expression
*expr
)
266 struct expression
*parent
;
269 parent
= expr_get_parent_expr(expr
);
273 if (parent
->type
== EXPR_PREOP
&& parent
->op
== '&')
275 if (parent
->type
== EXPR_PREOP
&& parent
->op
== '(')
277 if (parent
->type
== EXPR_DEREF
&& parent
->op
== '.')
286 void __split_expr(struct expression
*expr
)
291 // sm_msg(" Debug expr_type %d %s", expr->type, show_special(expr->op));
293 if (__in_fake_assign
&& expr
->type
!= EXPR_ASSIGNMENT
)
295 if (__in_fake_assign
>= 4) /* don't allow too much nesting */
298 push_expression(&big_expression_stack
, expr
);
299 set_position(expr
->pos
);
300 __pass_to_client(expr
, EXPR_HOOK
);
302 switch (expr
->type
) {
304 expr_set_parent_expr(expr
->unop
, expr
);
306 if (expr
->op
== '*' &&
307 !prev_expression_is_getting_address(expr
))
308 __pass_to_client(expr
, DEREF_HOOK
);
309 __split_expr(expr
->unop
);
310 __pass_to_client(expr
, OP_HOOK
);
313 expr_set_parent_expr(expr
->unop
, expr
);
315 __split_expr(expr
->unop
);
316 push_expression(&post_op_stack
, expr
);
320 if (expr
->statement
&& !expr_get_parent_expr(expr
->statement
)) {
321 stmt_set_parent_stmt(expr
->statement
,
322 last_ptr_list((struct ptr_list
*)big_statement_stack
));
324 __split_stmt(expr
->statement
);
329 expr_set_parent_expr(expr
->left
, expr
);
330 expr_set_parent_expr(expr
->right
, expr
);
332 __pass_to_client(expr
, LOGIC_HOOK
);
333 __handle_logic(expr
);
336 expr_set_parent_expr(expr
->left
, expr
);
337 expr_set_parent_expr(expr
->right
, expr
);
339 __pass_to_client(expr
, BINOP_HOOK
);
341 expr_set_parent_expr(expr
->left
, expr
);
342 expr_set_parent_expr(expr
->right
, expr
);
344 __split_expr(expr
->left
);
345 __process_post_op_stack();
346 __split_expr(expr
->right
);
348 case EXPR_ASSIGNMENT
: {
349 struct expression
*right
;
351 expr_set_parent_expr(expr
->left
, expr
);
352 expr_set_parent_expr(expr
->right
, expr
);
357 right
= strip_expr(expr
->right
);
359 __pass_to_client(expr
, RAW_ASSIGNMENT_HOOK
);
362 if (__handle_condition_assigns(expr
))
364 /* foo = (x < 5 ? foo : 5); */
365 if (__handle_select_assigns(expr
))
367 /* foo = ({frob(); frob(); frob(); 1;}) */
368 if (__handle_expr_statement_assigns(expr
))
371 if (handle_comma_assigns(expr
))
373 if (handle_postop_assigns(expr
))
376 __split_expr(expr
->right
);
377 if (outside_of_function())
378 __pass_to_client(expr
, GLOBAL_ASSIGNMENT_HOOK
);
380 __pass_to_client(expr
, ASSIGNMENT_HOOK
);
382 __fake_struct_member_assignments(expr
);
384 if (expr
->op
== '=' && right
->type
== EXPR_CALL
)
385 __pass_to_client(expr
, CALL_ASSIGNMENT_HOOK
);
387 if (get_macro_name(right
->pos
) &&
388 get_macro_name(expr
->pos
) != get_macro_name(right
->pos
))
389 __pass_to_client(expr
, MACRO_ASSIGNMENT_HOOK
);
391 __pass_to_client(expr
, ASSIGNMENT_HOOK_AFTER
);
393 __split_expr(expr
->left
);
397 expr_set_parent_expr(expr
->deref
, expr
);
399 __pass_to_client(expr
, DEREF_HOOK
);
400 __split_expr(expr
->deref
);
403 expr_set_parent_expr(expr
->base
, expr
);
405 __split_expr(expr
->base
);
408 case EXPR_FORCE_CAST
:
409 expr_set_parent_expr(expr
->cast_expression
, expr
);
411 __pass_to_client(expr
, CAST_HOOK
);
412 __split_expr(expr
->cast_expression
);
415 if (expr
->cast_expression
)
416 __pass_to_client(strip_parens(expr
->cast_expression
),
421 evaluate_expression(expr
);
423 case EXPR_CONDITIONAL
:
425 expr_set_parent_expr(expr
->conditional
, expr
);
426 expr_set_parent_expr(expr
->cond_true
, expr
);
427 expr_set_parent_expr(expr
->cond_false
, expr
);
429 if (known_condition_true(expr
->conditional
)) {
430 __split_expr(expr
->cond_true
);
433 if (known_condition_false(expr
->conditional
)) {
434 __split_expr(expr
->cond_false
);
437 __pass_to_client(expr
, SELECT_HOOK
);
438 __split_whole_condition(expr
->conditional
);
439 __split_expr(expr
->cond_true
);
440 __push_true_states();
441 __use_false_states();
442 __split_expr(expr
->cond_false
);
443 __merge_true_states();
446 expr_set_parent_expr(expr
->fn
, expr
);
448 if (sym_name_is("__builtin_constant_p", expr
->fn
))
450 split_expr_list(expr
->args
, expr
);
451 __split_expr(expr
->fn
);
452 if (is_inline_func(expr
->fn
))
453 add_inline_function(expr
->fn
->symbol
);
454 if (inlinable(expr
->fn
))
456 __process_post_op_stack();
457 __pass_to_client(expr
, FUNCTION_CALL_HOOK
);
459 if (inlinable(expr
->fn
)) {
462 __pass_to_client(expr
, CALL_HOOK_AFTER_INLINE
);
463 if (is_noreturn_func(expr
->fn
))
466 case EXPR_INITIALIZER
:
467 split_expr_list(expr
->expr_list
, expr
);
469 case EXPR_IDENTIFIER
:
470 expr_set_parent_expr(expr
->ident_expression
, expr
);
471 __split_expr(expr
->ident_expression
);
474 expr_set_parent_expr(expr
->idx_expression
, expr
);
475 __split_expr(expr
->idx_expression
);
478 expr_set_parent_expr(expr
->init_expr
, expr
);
479 __split_expr(expr
->init_expr
);
482 __pass_to_client(expr
, SYM_HOOK
);
485 __pass_to_client(expr
, STRING_HOOK
);
490 pop_expression(&big_expression_stack
);
493 static int is_forever_loop(struct statement
*stmt
)
495 struct expression
*expr
;
498 expr
= strip_expr(stmt
->iterator_pre_condition
);
500 expr
= stmt
->iterator_post_condition
;
502 /* this is a for(;;) loop... */
506 if (get_value(expr
, &sval
) && sval
.value
!= 0)
513 static char *get_loop_name(int num
)
517 snprintf(buf
, 255, "-loop%d", num
);
519 return alloc_sname(buf
);
523 * Pre Loops are while and for loops.
525 static void handle_pre_loop(struct statement
*stmt
)
527 int once_through
; /* we go through the loop at least once */
528 struct sm_state
*extra_sm
= NULL
;
531 struct stree
*stree
= NULL
;
532 struct sm_state
*sm
= NULL
;
534 loop_name
= get_loop_name(loop_num
);
537 __split_stmt(stmt
->iterator_pre_statement
);
538 __prev_stmt
= stmt
->iterator_pre_statement
;
540 once_through
= implied_condition_true(stmt
->iterator_pre_condition
);
546 __merge_gotos(loop_name
, NULL
);
548 extra_sm
= __extra_handle_canonical_loops(stmt
, &stree
);
549 __in_pre_condition
++;
550 __pass_to_client(stmt
, PRELOOP_HOOK
);
551 __split_whole_condition(stmt
->iterator_pre_condition
);
552 __in_pre_condition
--;
553 FOR_EACH_SM(stree
, sm
) {
554 set_state(sm
->owner
, sm
->name
, sm
->sym
, sm
->state
);
555 } END_FOR_EACH_SM(sm
);
558 extra_sm
= get_sm_state(extra_sm
->owner
, extra_sm
->name
, extra_sm
->sym
);
560 if (option_assume_loops
)
563 __split_stmt(stmt
->iterator_statement
);
564 if (is_forever_loop(stmt
)) {
566 __save_gotos(loop_name
, NULL
);
568 __push_fake_cur_stree();
569 __split_stmt(stmt
->iterator_post_statement
);
570 stree
= __pop_fake_cur_stree();
572 __discard_false_states();
575 if (!__path_is_null())
576 __merge_stree_into_cur(stree
);
580 unchanged
= __iterator_unchanged(extra_sm
);
581 __split_stmt(stmt
->iterator_post_statement
);
582 __prev_stmt
= stmt
->iterator_post_statement
;
585 __save_gotos(loop_name
, NULL
);
586 __in_pre_condition
++;
587 __split_whole_condition(stmt
->iterator_pre_condition
);
588 __in_pre_condition
--;
590 __merge_false_states();
592 __discard_false_states();
594 __merge_false_states();
596 if (extra_sm
&& unchanged
)
597 __extra_pre_loop_hook_after(extra_sm
,
598 stmt
->iterator_post_statement
,
599 stmt
->iterator_pre_condition
);
606 * Post loops are do {} while();
608 static void handle_post_loop(struct statement
*stmt
)
612 loop_name
= get_loop_name(loop_num
);
618 __merge_gotos(loop_name
, NULL
);
619 __split_stmt(stmt
->iterator_statement
);
621 if (!is_zero(stmt
->iterator_post_condition
))
622 __save_gotos(loop_name
, NULL
);
624 if (is_forever_loop(stmt
)) {
627 __split_whole_condition(stmt
->iterator_post_condition
);
628 __use_false_states();
634 static int empty_statement(struct statement
*stmt
)
638 if (stmt
->type
== STMT_EXPRESSION
&& !stmt
->expression
)
643 static int last_stmt_on_same_line(void)
645 struct statement
*stmt
;
648 FOR_EACH_PTR_REVERSE(big_statement_stack
, stmt
) {
651 if (stmt
->pos
.line
== get_lineno())
654 } END_FOR_EACH_PTR_REVERSE(stmt
);
658 static void split_asm_constraints(struct expression_list
*expr_list
)
660 struct expression
*expr
;
663 FOR_EACH_PTR(expr_list
, expr
) {
665 case 0: /* identifier */
666 case 1: /* constraint */
669 case 2: /* expression */
674 } END_FOR_EACH_PTR(expr
);
677 static int is_case_val(struct statement
*stmt
, sval_t sval
)
681 if (stmt
->type
!= STMT_CASE
)
683 if (!stmt
->case_expression
) {
687 if (!get_value(stmt
->case_expression
, &case_sval
))
689 if (case_sval
.value
== sval
.value
)
694 static struct range_list
*get_case_rl(struct expression
*switch_expr
,
695 struct expression
*case_expr
,
696 struct expression
*case_to
)
699 struct range_list
*rl
= NULL
;
700 struct symbol
*switch_type
;
702 switch_type
= get_type(switch_expr
);
703 if (get_value(case_to
, &end
) && get_value(case_expr
, &start
)) {
704 start
= sval_cast(switch_type
, start
);
705 end
= sval_cast(switch_type
, end
);
706 add_range(&rl
, start
, end
);
707 } else if (get_value(case_expr
, &start
)) {
708 start
= sval_cast(switch_type
, start
);
709 add_range(&rl
, start
, start
);
715 static void split_known_switch(struct statement
*stmt
, sval_t sval
)
717 struct statement
*tmp
;
718 struct range_list
*rl
;
720 __split_expr(stmt
->switch_expression
);
721 sval
= sval_cast(get_type(stmt
->switch_expression
), sval
);
723 push_expression(&switch_expr_stack
, stmt
->switch_expression
);
724 __save_switch_states(top_expression(switch_expr_stack
));
729 stmt
= stmt
->switch_statement
;
731 __push_scope_hooks();
732 FOR_EACH_PTR(stmt
->stmts
, tmp
) {
733 __smatch_lineno
= tmp
->pos
.line
;
734 if (is_case_val(tmp
, sval
)) {
735 rl
= alloc_rl(sval
, sval
);
736 __merge_switches(top_expression(switch_expr_stack
), rl
);
737 __pass_case_to_client(top_expression(switch_expr_stack
), rl
);
739 if (__path_is_null())
742 if (__path_is_null()) {
746 } END_FOR_EACH_PTR(tmp
);
748 __call_scope_hooks();
749 if (!__pop_default())
750 __merge_switches(top_expression(switch_expr_stack
), NULL
);
751 __discard_switches();
753 pop_expression(&switch_expr_stack
);
756 static void split_case(struct statement
*stmt
)
758 struct range_list
*rl
= NULL
;
760 rl
= get_case_rl(top_expression(switch_expr_stack
),
761 stmt
->case_expression
, stmt
->case_to
);
762 while (stmt
->case_statement
->type
== STMT_CASE
) {
763 struct range_list
*tmp
;
765 tmp
= get_case_rl(top_expression(switch_expr_stack
),
766 stmt
->case_statement
->case_expression
,
767 stmt
->case_statement
->case_to
);
770 rl
= rl_union(rl
, tmp
);
771 if (!stmt
->case_expression
)
773 stmt
= stmt
->case_statement
;
776 __merge_switches(top_expression(switch_expr_stack
), rl
);
778 if (!stmt
->case_expression
)
780 __split_stmt(stmt
->case_statement
);
783 static int taking_too_long(void)
787 ms
= ms_since(&fn_start_time
);
788 if (ms
> 1000 * 60 * 5) /* five minutes */
793 static int is_last_stmt(struct statement
*cur_stmt
)
795 struct symbol
*fn
= get_base_type(cur_func_sym
);
796 struct statement
*stmt
;
802 stmt
= fn
->inline_stmt
;
803 if (!stmt
|| stmt
->type
!= STMT_COMPOUND
)
805 stmt
= last_ptr_list((struct ptr_list
*)stmt
->stmts
);
806 if (stmt
&& stmt
->type
== STMT_LABEL
)
807 stmt
= stmt
->label_statement
;
808 if (stmt
== cur_stmt
)
813 static void handle_backward_goto(struct statement
*goto_stmt
)
815 const char *goto_name
, *label_name
;
816 struct statement
*func_stmt
;
817 struct symbol
*base_type
= get_base_type(cur_func_sym
);
818 struct statement
*tmp
;
823 if (last_goto_statement_handled
)
825 last_goto_statement_handled
= 1;
827 if (!goto_stmt
->goto_label
||
828 goto_stmt
->goto_label
->type
!= SYM_LABEL
||
829 !goto_stmt
->goto_label
->ident
)
831 goto_name
= goto_stmt
->goto_label
->ident
->name
;
833 func_stmt
= base_type
->stmt
;
835 func_stmt
= base_type
->inline_stmt
;
838 if (func_stmt
->type
!= STMT_COMPOUND
)
841 FOR_EACH_PTR(func_stmt
->stmts
, tmp
) {
843 if (tmp
->type
!= STMT_LABEL
)
845 if (!tmp
->label_identifier
||
846 tmp
->label_identifier
->type
!= SYM_LABEL
||
847 !tmp
->label_identifier
->ident
)
849 label_name
= tmp
->label_identifier
->ident
->name
;
850 if (strcmp(goto_name
, label_name
) != 0)
855 } END_FOR_EACH_PTR(tmp
);
858 static void fake_a_return(void)
860 struct symbol
*return_type
;
865 return_type
= get_real_base_type(cur_func_sym
);
866 return_type
= get_real_base_type(return_type
);
867 if (return_type
!= &void_ctype
) {
868 __pass_to_client(unknown_value_expression(NULL
), RETURN_HOOK
);
873 static void fake_an_empty_default(struct position pos
)
875 static struct statement none
= {};
878 none
.type
= STMT_NONE
;
879 __merge_switches(top_expression(switch_expr_stack
), NULL
);
883 static void split_compound(struct statement
*stmt
)
885 struct statement
*prev
= NULL
;
886 struct statement
*cur
= NULL
;
887 struct statement
*next
;
889 __push_scope_hooks();
891 FOR_EACH_PTR(stmt
->stmts
, next
) {
892 /* just set them all ahead of time */
893 stmt_set_parent_stmt(next
, stmt
);
903 } END_FOR_EACH_PTR(next
);
912 * For function scope, then delay calling the scope hooks until the
913 * end of function hooks can run. I'm not positive this is the right
916 if (!is_last_stmt(cur
))
917 __call_scope_hooks();
921 * This is a hack, work around for detecting empty functions.
923 static int need_delayed_scope_hooks(void)
925 struct symbol
*fn
= get_base_type(cur_func_sym
);
926 struct statement
*stmt
;
932 stmt
= fn
->inline_stmt
;
933 if (stmt
&& stmt
->type
== STMT_COMPOUND
)
938 void __split_label_stmt(struct statement
*stmt
)
940 if (stmt
->label_identifier
&&
941 stmt
->label_identifier
->type
== SYM_LABEL
&&
942 stmt
->label_identifier
->ident
) {
943 loop_count
|= 0x80000000;
944 __merge_gotos(stmt
->label_identifier
->ident
->name
, stmt
->label_identifier
);
948 static void find_asm_gotos(struct statement
*stmt
)
952 FOR_EACH_PTR(stmt
->asm_labels
, sym
) {
953 __save_gotos(sym
->ident
->name
, sym
);
954 } END_FOR_EACH_PTR(sym
);
957 void __split_stmt(struct statement
*stmt
)
964 if (__bail_on_rest_of_function
)
967 if (out_of_memory() || taking_too_long()) {
969 __bail_on_rest_of_function
= 1;
971 sm_msg("Function too hairy. Giving up.");
973 final_pass
= 0; /* turn off sm_msg() from here */
977 add_ptr_list(&big_statement_stack
, stmt
);
978 free_expression_stack(&big_expression_stack
);
979 set_position(stmt
->pos
);
980 __pass_to_client(stmt
, STMT_HOOK
);
982 switch (stmt
->type
) {
983 case STMT_DECLARATION
:
984 split_declaration(stmt
->declaration
);
987 __split_expr(stmt
->ret_value
);
988 __pass_to_client(stmt
->ret_value
, RETURN_HOOK
);
989 __process_post_op_stack();
992 case STMT_EXPRESSION
:
993 __split_expr(stmt
->expression
);
996 split_compound(stmt
);
999 stmt_set_parent_stmt(stmt
->if_true
, stmt
);
1000 stmt_set_parent_stmt(stmt
->if_false
, stmt
);
1002 if (known_condition_true(stmt
->if_conditional
)) {
1003 __split_stmt(stmt
->if_true
);
1006 if (known_condition_false(stmt
->if_conditional
)) {
1007 __split_stmt(stmt
->if_false
);
1010 __split_whole_condition(stmt
->if_conditional
);
1011 __split_stmt(stmt
->if_true
);
1012 if (empty_statement(stmt
->if_true
) &&
1013 last_stmt_on_same_line() &&
1014 !get_macro_name(stmt
->if_true
->pos
))
1015 sm_msg("warn: if();");
1016 __push_true_states();
1017 __use_false_states();
1018 __split_stmt(stmt
->if_false
);
1019 __merge_true_states();
1022 stmt_set_parent_stmt(stmt
->iterator_pre_statement
, stmt
);
1023 stmt_set_parent_stmt(stmt
->iterator_statement
, stmt
);
1024 stmt_set_parent_stmt(stmt
->iterator_post_statement
, stmt
);
1026 if (stmt
->iterator_pre_condition
)
1027 handle_pre_loop(stmt
);
1028 else if (stmt
->iterator_post_condition
)
1029 handle_post_loop(stmt
);
1031 // these are for(;;) type loops.
1032 handle_pre_loop(stmt
);
1036 stmt_set_parent_stmt(stmt
->switch_statement
, stmt
);
1038 if (get_value(stmt
->switch_expression
, &sval
)) {
1039 split_known_switch(stmt
, sval
);
1042 __split_expr(stmt
->switch_expression
);
1043 push_expression(&switch_expr_stack
, stmt
->switch_expression
);
1044 __save_switch_states(top_expression(switch_expr_stack
));
1048 __split_stmt(stmt
->switch_statement
);
1049 if (!__pop_default())
1050 fake_an_empty_default(stmt
->pos
);
1051 __discard_switches();
1053 pop_expression(&switch_expr_stack
);
1059 __split_label_stmt(stmt
);
1060 __split_stmt(stmt
->label_statement
);
1063 __split_expr(stmt
->goto_expression
);
1064 if (stmt
->goto_label
&& stmt
->goto_label
->type
== SYM_NODE
) {
1065 if (!strcmp(stmt
->goto_label
->ident
->name
, "break")) {
1067 } else if (!strcmp(stmt
->goto_label
->ident
->name
,
1069 __process_continues();
1071 } else if (stmt
->goto_label
&&
1072 stmt
->goto_label
->type
== SYM_LABEL
&&
1073 stmt
->goto_label
->ident
) {
1074 __save_gotos(stmt
->goto_label
->ident
->name
, stmt
->goto_label
);
1077 if (is_last_stmt(stmt
))
1078 handle_backward_goto(stmt
);
1083 find_asm_gotos(stmt
);
1084 __pass_to_client(stmt
, ASM_HOOK
);
1085 __split_expr(stmt
->asm_string
);
1086 split_asm_constraints(stmt
->asm_outputs
);
1087 split_asm_constraints(stmt
->asm_inputs
);
1088 split_asm_constraints(stmt
->asm_clobbers
);
1093 __split_expr(stmt
->range_expression
);
1094 __split_expr(stmt
->range_low
);
1095 __split_expr(stmt
->range_high
);
1098 __pass_to_client(stmt
, STMT_HOOK_AFTER
);
1100 __process_post_op_stack();
1103 static void split_expr_list(struct expression_list
*expr_list
, struct expression
*parent
)
1105 struct expression
*expr
;
1107 FOR_EACH_PTR(expr_list
, expr
) {
1108 expr_set_parent_expr(expr
, parent
);
1110 __process_post_op_stack();
1111 } END_FOR_EACH_PTR(expr
);
1114 static void split_sym(struct symbol
*sym
)
1118 if (!(sym
->namespace & NS_SYMBOL
))
1121 __split_stmt(sym
->stmt
);
1122 __split_expr(sym
->array_size
);
1123 split_symlist(sym
->arguments
);
1124 split_symlist(sym
->symbol_list
);
1125 __split_stmt(sym
->inline_stmt
);
1126 split_symlist(sym
->inline_symbol_list
);
1129 static void split_symlist(struct symbol_list
*sym_list
)
1133 FOR_EACH_PTR(sym_list
, sym
) {
1135 } END_FOR_EACH_PTR(sym
);
1138 typedef void (fake_cb
)(struct expression
*expr
);
1140 static int member_to_number(struct expression
*expr
, struct ident
*member
)
1142 struct symbol
*type
, *tmp
;
1148 name
= member
->name
;
1150 type
= get_type(expr
);
1151 if (!type
|| type
->type
!= SYM_STRUCT
)
1155 FOR_EACH_PTR(type
->symbol_list
, tmp
) {
1159 if (strcmp(name
, tmp
->ident
->name
) == 0)
1161 } END_FOR_EACH_PTR(tmp
);
1165 static struct ident
*number_to_member(struct expression
*expr
, int num
)
1167 struct symbol
*type
, *member
;
1170 type
= get_type(expr
);
1171 if (!type
|| type
->type
!= SYM_STRUCT
)
1174 FOR_EACH_PTR(type
->symbol_list
, member
) {
1176 return member
->ident
;
1178 } END_FOR_EACH_PTR(member
);
1182 static void fake_element_assigns_helper(struct expression
*array
, struct expression_list
*expr_list
, fake_cb
*fake_cb
);
1184 static void set_inner_struct_members(struct expression
*expr
, struct symbol
*member
)
1186 struct expression
*edge_member
, *assign
;
1187 struct symbol
*base
= get_real_base_type(member
);
1191 expr
= member_expression(expr
, '.', member
->ident
);
1193 FOR_EACH_PTR(base
->symbol_list
, tmp
) {
1194 struct symbol
*type
;
1196 type
= get_real_base_type(tmp
);
1200 edge_member
= member_expression(expr
, '.', tmp
->ident
);
1201 if (get_state_expr(SMATCH_EXTRA
, edge_member
))
1204 if (type
->type
== SYM_UNION
|| type
->type
== SYM_STRUCT
) {
1205 set_inner_struct_members(expr
, tmp
);
1212 assign
= assign_expression(edge_member
, zero_expr());
1213 __split_expr(assign
);
1214 } END_FOR_EACH_PTR(tmp
);
1219 static void set_unset_to_zero(struct symbol
*type
, struct expression
*expr
)
1222 struct expression
*member
= NULL
;
1223 struct expression
*assign
;
1226 if (expr
->type
== EXPR_PREOP
&& expr
->op
== '&') {
1227 expr
= strip_expr(expr
->unop
);
1231 FOR_EACH_PTR(type
->symbol_list
, tmp
) {
1232 type
= get_real_base_type(tmp
);
1237 member
= member_expression(expr
, op
, tmp
->ident
);
1238 if (get_state_expr(SMATCH_EXTRA
, member
))
1242 if (type
->type
== SYM_UNION
|| type
->type
== SYM_STRUCT
) {
1243 set_inner_struct_members(expr
, tmp
);
1246 if (type
->type
== SYM_ARRAY
)
1251 assign
= assign_expression(member
, zero_expr());
1252 __split_expr(assign
);
1253 } END_FOR_EACH_PTR(tmp
);
1256 static void fake_member_assigns_helper(struct expression
*symbol
, struct expression_list
*members
, fake_cb
*fake_cb
)
1258 struct expression
*deref
, *assign
, *tmp
, *right
;
1259 struct symbol
*struct_type
, *type
;
1260 struct ident
*member
;
1263 struct_type
= get_type(symbol
);
1265 (struct_type
->type
!= SYM_STRUCT
&& struct_type
->type
!= SYM_UNION
))
1269 * We're parsing an initializer that could look something like this:
1270 * struct foo foo = {
1272 * .whatever.xxx = 11,
1276 * So what we have here is a list with 42, .whatever, and .zzz. We need
1277 * to break it up into left and right sides of the assignments.
1281 FOR_EACH_PTR(members
, tmp
) {
1283 if (tmp
->type
== EXPR_IDENTIFIER
) {
1284 member_idx
= member_to_number(symbol
, tmp
->expr_ident
);
1285 while (tmp
->type
== EXPR_IDENTIFIER
) {
1286 member
= tmp
->expr_ident
;
1287 tmp
= tmp
->ident_expression
;
1289 deref
= member_expression(deref
, '.', member
);
1291 deref
= member_expression(symbol
, '.', member
);
1294 member
= number_to_member(symbol
, member_idx
);
1295 deref
= member_expression(symbol
, '.', member
);
1299 if (right
->type
== EXPR_INITIALIZER
) {
1300 type
= get_type(deref
);
1301 if (type
&& type
->type
== SYM_ARRAY
)
1302 fake_element_assigns_helper(deref
, right
->expr_list
, fake_cb
);
1304 fake_member_assigns_helper(deref
, right
->expr_list
, fake_cb
);
1306 assign
= assign_expression(deref
, right
);
1309 } END_FOR_EACH_PTR(tmp
);
1311 set_unset_to_zero(struct_type
, symbol
);
1314 static void fake_member_assigns(struct symbol
*sym
, fake_cb
*fake_cb
)
1316 fake_member_assigns_helper(symbol_expression(sym
),
1317 sym
->initializer
->expr_list
, fake_cb
);
1320 static void fake_element_assigns_helper(struct expression
*array
, struct expression_list
*expr_list
, fake_cb
*fake_cb
)
1322 struct expression
*offset
, *binop
, *assign
, *tmp
;
1323 struct symbol
*type
;
1326 if (ptr_list_size((struct ptr_list
*)expr_list
) > 1000)
1330 FOR_EACH_PTR(expr_list
, tmp
) {
1331 if (tmp
->type
== EXPR_INDEX
) {
1332 if (tmp
->idx_from
!= tmp
->idx_to
)
1334 idx
= tmp
->idx_from
;
1335 if (!tmp
->idx_expression
)
1337 tmp
= tmp
->idx_expression
;
1339 offset
= value_expr(idx
);
1340 binop
= array_element_expression(array
, offset
);
1341 if (tmp
->type
== EXPR_INITIALIZER
) {
1342 type
= get_type(binop
);
1343 if (type
&& type
->type
== SYM_ARRAY
)
1344 fake_element_assigns_helper(binop
, tmp
->expr_list
, fake_cb
);
1346 fake_member_assigns_helper(binop
, tmp
->expr_list
, fake_cb
);
1348 assign
= assign_expression(binop
, tmp
);
1353 } END_FOR_EACH_PTR(tmp
);
1356 static void fake_element_assigns(struct symbol
*sym
, fake_cb
*fake_cb
)
1358 fake_element_assigns_helper(symbol_expression(sym
), sym
->initializer
->expr_list
, fake_cb
);
1361 static void fake_assign_expr(struct symbol
*sym
)
1363 struct expression
*assign
, *symbol
;
1365 symbol
= symbol_expression(sym
);
1366 assign
= assign_expression(symbol
, sym
->initializer
);
1367 __split_expr(assign
);
1370 static void call_split_expr(struct expression
*expr
)
1375 static void do_initializer_stuff(struct symbol
*sym
)
1377 if (!sym
->initializer
)
1380 if (sym
->initializer
->type
== EXPR_INITIALIZER
) {
1381 if (get_real_base_type(sym
)->type
== SYM_ARRAY
)
1382 fake_element_assigns(sym
, call_split_expr
);
1384 fake_member_assigns(sym
, call_split_expr
);
1386 fake_assign_expr(sym
);
1390 static void split_declaration(struct symbol_list
*sym_list
)
1394 FOR_EACH_PTR(sym_list
, sym
) {
1395 __pass_to_client(sym
, DECLARATION_HOOK
);
1396 do_initializer_stuff(sym
);
1398 } END_FOR_EACH_PTR(sym
);
1401 static void call_global_assign_hooks(struct expression
*assign
)
1403 __pass_to_client(assign
, GLOBAL_ASSIGNMENT_HOOK
);
1406 static void fake_global_assign(struct symbol
*sym
)
1408 struct expression
*assign
, *symbol
;
1410 if (get_real_base_type(sym
)->type
== SYM_ARRAY
) {
1411 if (sym
->initializer
&& sym
->initializer
->type
== EXPR_INITIALIZER
) {
1412 fake_element_assigns(sym
, call_global_assign_hooks
);
1413 } else if (sym
->initializer
) {
1414 symbol
= symbol_expression(sym
);
1415 assign
= assign_expression(symbol
, sym
->initializer
);
1416 __pass_to_client(assign
, GLOBAL_ASSIGNMENT_HOOK
);
1418 fake_element_assigns_helper(symbol_expression(sym
), NULL
, call_global_assign_hooks
);
1420 } else if (get_real_base_type(sym
)->type
== SYM_STRUCT
) {
1421 if (sym
->initializer
&& sym
->initializer
->type
== EXPR_INITIALIZER
) {
1422 fake_member_assigns(sym
, call_global_assign_hooks
);
1423 } else if (sym
->initializer
) {
1424 symbol
= symbol_expression(sym
);
1425 assign
= assign_expression(symbol
, sym
->initializer
);
1426 __pass_to_client(assign
, GLOBAL_ASSIGNMENT_HOOK
);
1428 fake_member_assigns_helper(symbol_expression(sym
), NULL
, call_global_assign_hooks
);
1431 symbol
= symbol_expression(sym
);
1432 if (sym
->initializer
)
1433 assign
= assign_expression(symbol
, sym
->initializer
);
1435 assign
= assign_expression(symbol
, zero_expr());
1436 __pass_to_client(assign
, GLOBAL_ASSIGNMENT_HOOK
);
1440 static void start_function_definition(struct symbol
*sym
)
1442 __in_function_def
= 1;
1443 __pass_to_client(sym
, FUNC_DEF_HOOK
);
1444 __in_function_def
= 0;
1445 __pass_to_client(sym
, AFTER_DEF_HOOK
);
1449 static void split_function(struct symbol
*sym
)
1451 struct symbol
*base_type
= get_base_type(sym
);
1453 if (!base_type
->stmt
&& !base_type
->inline_stmt
)
1456 gettimeofday(&fn_start_time
, NULL
);
1459 cur_func
= sym
->ident
->name
;
1460 set_position(sym
->pos
);
1462 last_goto_statement_handled
= 0;
1463 sm_debug("new function: %s\n", cur_func
);
1465 if (option_two_passes
) {
1469 start_function_definition(sym
);
1470 __split_stmt(base_type
->stmt
);
1471 __split_stmt(base_type
->inline_stmt
);
1477 start_function_definition(sym
);
1478 __split_stmt(base_type
->stmt
);
1479 __split_stmt(base_type
->inline_stmt
);
1480 __pass_to_client(sym
, END_FUNC_HOOK
);
1481 if (need_delayed_scope_hooks())
1482 __call_scope_hooks();
1483 __pass_to_client(sym
, AFTER_FUNC_HOOK
);
1486 cur_func_sym
= NULL
;
1488 free_data_info_allocs();
1489 free_expression_stack(&switch_expr_stack
);
1490 __free_ptr_list((struct ptr_list
**)&big_statement_stack
);
1491 __bail_on_rest_of_function
= 0;
1494 static void parse_inline(struct expression
*call
)
1496 struct symbol
*base_type
;
1497 int loop_num_bak
= loop_num
;
1498 int loop_count_bak
= loop_count
;
1499 int final_pass_bak
= final_pass
;
1500 char *cur_func_bak
= cur_func
;
1501 struct statement_list
*big_statement_stack_bak
= big_statement_stack
;
1502 struct expression_list
*big_expression_stack_bak
= big_expression_stack
;
1503 struct expression_list
*big_condition_stack_bak
= big_condition_stack
;
1504 struct expression_list
*switch_expr_stack_bak
= switch_expr_stack
;
1505 struct symbol
*cur_func_sym_bak
= cur_func_sym
;
1507 __pass_to_client(call
, INLINE_FN_START
);
1508 final_pass
= 0; /* don't print anything */
1511 base_type
= get_base_type(call
->fn
->symbol
);
1512 cur_func_sym
= call
->fn
->symbol
;
1513 if (call
->fn
->symbol
->ident
)
1514 cur_func
= call
->fn
->symbol
->ident
->name
;
1517 set_position(call
->fn
->symbol
->pos
);
1520 big_statement_stack
= NULL
;
1521 big_expression_stack
= NULL
;
1522 big_condition_stack
= NULL
;
1523 switch_expr_stack
= NULL
;
1525 sm_debug("inline function: %s\n", cur_func
);
1528 start_function_definition(call
->fn
->symbol
);
1529 __split_stmt(base_type
->stmt
);
1530 __split_stmt(base_type
->inline_stmt
);
1531 __pass_to_client(call
->fn
->symbol
, END_FUNC_HOOK
);
1532 __pass_to_client(call
->fn
->symbol
, AFTER_FUNC_HOOK
);
1534 free_expression_stack(&switch_expr_stack
);
1535 __free_ptr_list((struct ptr_list
**)&big_statement_stack
);
1539 loop_num
= loop_num_bak
;
1540 loop_count
= loop_count_bak
;
1541 final_pass
= final_pass_bak
;
1542 cur_func_sym
= cur_func_sym_bak
;
1543 cur_func
= cur_func_bak
;
1544 big_statement_stack
= big_statement_stack_bak
;
1545 big_expression_stack
= big_expression_stack_bak
;
1546 big_condition_stack
= big_condition_stack_bak
;
1547 switch_expr_stack
= switch_expr_stack_bak
;
1549 restore_all_states();
1550 set_position(call
->pos
);
1552 __pass_to_client(call
, INLINE_FN_END
);
1555 static struct symbol_list
*inlines_called
;
1556 static void add_inline_function(struct symbol
*sym
)
1558 static struct symbol_list
*already_added
;
1561 FOR_EACH_PTR(already_added
, tmp
) {
1564 } END_FOR_EACH_PTR(tmp
);
1566 add_ptr_list(&already_added
, sym
);
1567 add_ptr_list(&inlines_called
, sym
);
1570 static void process_inlines(void)
1574 FOR_EACH_PTR(inlines_called
, tmp
) {
1575 split_function(tmp
);
1576 } END_FOR_EACH_PTR(tmp
);
1577 free_ptr_list(&inlines_called
);
1580 static struct symbol
*get_last_scoped_symbol(struct symbol_list
*big_list
, int use_static
)
1584 FOR_EACH_PTR_REVERSE(big_list
, sym
) {
1587 if (use_static
&& sym
->ctype
.modifiers
& MOD_STATIC
)
1589 if (!use_static
&& !(sym
->ctype
.modifiers
& MOD_STATIC
))
1591 } END_FOR_EACH_PTR_REVERSE(sym
);
1596 static void split_inlines_in_scope(struct symbol
*sym
)
1598 struct symbol
*base
;
1599 struct symbol_list
*scope_list
;
1602 scope_list
= sym
->scope
->symbols
;
1603 stream
= sym
->pos
.stream
;
1605 /* find the last static symbol in the file */
1606 FOR_EACH_PTR_REVERSE(scope_list
, sym
) {
1607 if (sym
->pos
.stream
!= stream
)
1609 if (sym
->type
!= SYM_NODE
)
1611 base
= get_base_type(sym
);
1614 if (base
->type
!= SYM_FN
)
1616 if (!base
->inline_stmt
)
1618 add_inline_function(sym
);
1619 } END_FOR_EACH_PTR_REVERSE(sym
);
1624 static void split_inlines(struct symbol_list
*sym_list
)
1628 sym
= get_last_scoped_symbol(sym_list
, 0);
1630 split_inlines_in_scope(sym
);
1631 sym
= get_last_scoped_symbol(sym_list
, 1);
1633 split_inlines_in_scope(sym
);
1636 static struct stree
*clone_estates_perm(struct stree
*orig
)
1638 struct stree
*ret
= NULL
;
1639 struct sm_state
*tmp
;
1641 FOR_EACH_SM(orig
, tmp
) {
1642 set_state_stree_perm(&ret
, tmp
->owner
, tmp
->name
, tmp
->sym
, clone_estate_perm(tmp
->state
));
1643 } END_FOR_EACH_SM(tmp
);
1648 struct position last_pos
;
1649 static void split_functions(struct symbol_list
*sym_list
)
1654 FOR_EACH_PTR(sym_list
, sym
) {
1655 set_position(sym
->pos
);
1656 if (sym
->type
!= SYM_NODE
|| get_base_type(sym
)->type
!= SYM_FN
) {
1657 __pass_to_client(sym
, BASE_HOOK
);
1658 fake_global_assign(sym
);
1660 } END_FOR_EACH_PTR(sym
);
1661 global_states
= clone_estates_perm(get_all_states_stree(SMATCH_EXTRA
));
1664 FOR_EACH_PTR(sym_list
, sym
) {
1665 set_position(sym
->pos
);
1666 if (sym
->type
== SYM_NODE
&& get_base_type(sym
)->type
== SYM_FN
) {
1667 split_function(sym
);
1670 last_pos
= sym
->pos
;
1671 } END_FOR_EACH_PTR(sym
);
1672 split_inlines(sym_list
);
1673 __pass_to_client(sym_list
, END_FILE_HOOK
);
1676 static int final_before_fake
;
1677 void init_fake_env(void)
1680 final_before_fake
= final_pass
;
1682 __push_fake_cur_stree();
1686 void end_fake_env(void)
1688 __pop_fake_cur_stree();
1691 final_pass
= final_before_fake
;
1694 void smatch(int argc
, char **argv
)
1696 struct string_list
*filelist
= NULL
;
1697 struct symbol_list
*sym_list
;
1698 struct timeval stop
, start
;
1700 gettimeofday(&start
, NULL
);
1703 printf("Usage: smatch [--debug] <filename.c>\n");
1706 sparse_initialize(argc
, argv
, &filelist
);
1707 set_valid_ptr_max();
1708 FOR_EACH_PTR_NOTAG(filelist
, base_file
) {
1709 if (option_file_output
) {
1712 snprintf(buf
, sizeof(buf
), "%s.smatch", base_file
);
1713 sm_outfd
= fopen(buf
, "w");
1715 printf("Error: Cannot open %s\n", base_file
);
1719 sym_list
= sparse_keep_tokens(base_file
);
1720 split_functions(sym_list
);
1721 } END_FOR_EACH_PTR_NOTAG(base_file
);
1723 gettimeofday(&stop
, NULL
);
1725 set_position(last_pos
);
1727 sm_msg("time: %lu", stop
.tv_sec
- start
.tv_sec
);