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 static int last_goto_statement_handled
;
42 int __expr_stmt_count
;
43 int __in_function_def
;
44 static struct expression_list
*switch_expr_stack
= NULL
;
45 static struct expression_list
*post_op_stack
= NULL
;
47 struct expression_list
*big_expression_stack
;
48 struct statement_list
*big_statement_stack
;
49 struct statement
*__prev_stmt
;
50 struct statement
*__cur_stmt
;
51 struct statement
*__next_stmt
;
52 int __in_pre_condition
= 0;
53 int __bail_on_rest_of_function
= 0;
54 static struct timeval fn_start_time
;
55 char *get_function(void) { return cur_func
; }
56 int get_lineno(void) { return __smatch_lineno
; }
57 int inside_loop(void) { return !!loop_count
; }
58 int definitely_inside_loop(void) { return !!(loop_count
& ~0x80000000); }
59 struct expression
*get_switch_expr(void) { return top_expression(switch_expr_stack
); }
60 int in_expression_statement(void) { return !!__expr_stmt_count
; }
62 static void split_symlist(struct symbol_list
*sym_list
);
63 static void split_declaration(struct symbol_list
*sym_list
);
64 static void split_expr_list(struct expression_list
*expr_list
, struct expression
*parent
);
65 static void add_inline_function(struct symbol
*sym
);
66 static void parse_inline(struct expression
*expr
);
68 int option_assume_loops
= 0;
69 int option_two_passes
= 0;
70 struct symbol
*cur_func_sym
= NULL
;
71 struct stree
*global_states
;
73 long long valid_ptr_min
= 4096;
74 long long valid_ptr_max
= 2117777777;
75 sval_t valid_ptr_min_sval
= {
79 sval_t valid_ptr_max_sval
= {
81 {.value
= LONG_MAX
- 100000},
84 static void set_valid_ptr_max(void)
86 if (type_bits(&ptr_ctype
) == 32)
87 valid_ptr_max
= 2117777777;
88 else if (type_bits(&ptr_ctype
) == 64)
89 valid_ptr_max
= 2117777777777777777LL;
91 valid_ptr_max_sval
.value
= valid_ptr_max
;
94 int outside_of_function(void)
96 return cur_func_sym
== NULL
;
99 const char *get_filename(void)
103 if (option_full_path
)
104 return full_filename
;
108 const char *get_base_file(void)
113 static void set_position(struct position pos
)
116 static int prev_stream
= -1;
118 if (pos
.stream
== 0 && pos
.line
== 0)
121 __smatch_lineno
= pos
.line
;
123 if (pos
.stream
== prev_stream
)
126 filename
= stream_name(pos
.stream
);
129 pathname
= getcwd(NULL
, 0);
131 len
= strlen(pathname
) + 1 + strlen(filename
) + 1;
132 full_filename
= malloc(len
);
133 snprintf(full_filename
, len
, "%s/%s", pathname
, filename
);
135 full_filename
= alloc_string(filename
);
140 void set_parent_expr(struct expression
*expr
, struct expression
*parent
)
144 expr
->parent
= parent
;
147 static void set_parent_stmt(struct statement
*stmt
, struct statement
*parent
)
151 stmt
->parent
= parent
;
154 int is_assigned_call(struct expression
*expr
)
156 struct expression
*tmp
;
158 FOR_EACH_PTR_REVERSE(big_expression_stack
, tmp
) {
159 if (tmp
->type
== EXPR_ASSIGNMENT
&& tmp
->op
== '=' &&
160 strip_expr(tmp
->right
) == expr
)
162 if (tmp
->pos
.line
< expr
->pos
.line
)
164 } END_FOR_EACH_PTR_REVERSE(tmp
);
168 static int is_inline_func(struct expression
*expr
)
170 if (expr
->type
!= EXPR_SYMBOL
|| !expr
->symbol
)
172 if (expr
->symbol
->ctype
.modifiers
& MOD_INLINE
)
177 static int is_noreturn_func(struct expression
*expr
)
179 if (expr
->type
!= EXPR_SYMBOL
|| !expr
->symbol
)
181 if (expr
->symbol
->ctype
.modifiers
& MOD_NORETURN
)
186 int inlinable(struct expression
*expr
)
189 struct statement
*last_stmt
= NULL
;
191 if (__inline_fn
) /* don't nest */
194 if (expr
->type
!= EXPR_SYMBOL
|| !expr
->symbol
)
196 if (is_no_inline_function(expr
->symbol
->ident
->name
))
198 sym
= get_base_type(expr
->symbol
);
199 if (sym
->stmt
&& sym
->stmt
->type
== STMT_COMPOUND
) {
200 if (ptr_list_size((struct ptr_list
*)sym
->stmt
->stmts
) > 10)
202 if (sym
->stmt
->type
!= STMT_COMPOUND
)
204 last_stmt
= last_ptr_list((struct ptr_list
*)sym
->stmt
->stmts
);
206 if (sym
->inline_stmt
&& sym
->inline_stmt
->type
== STMT_COMPOUND
) {
207 if (ptr_list_size((struct ptr_list
*)sym
->inline_stmt
->stmts
) > 10)
209 if (sym
->inline_stmt
->type
!= STMT_COMPOUND
)
211 last_stmt
= last_ptr_list((struct ptr_list
*)sym
->inline_stmt
->stmts
);
217 /* the magic numbers in this function are pulled out of my bum. */
218 if (last_stmt
->pos
.line
> sym
->pos
.line
+ 20)
224 void __process_post_op_stack(void)
226 struct expression
*expr
;
228 FOR_EACH_PTR(post_op_stack
, expr
) {
229 __pass_to_client(expr
, OP_HOOK
);
230 } END_FOR_EACH_PTR(expr
);
232 __free_ptr_list((struct ptr_list
**)&post_op_stack
);
235 static int handle_comma_assigns(struct expression
*expr
)
237 struct expression
*right
;
238 struct expression
*assign
;
240 right
= strip_expr(expr
->right
);
241 if (right
->type
!= EXPR_COMMA
)
244 __split_expr(right
->left
);
245 __process_post_op_stack();
247 assign
= assign_expression(expr
->left
, right
->right
);
248 __split_expr(assign
);
253 /* This is to handle *p++ = foo; assignments */
254 static int handle_postop_assigns(struct expression
*expr
)
256 struct expression
*left
, *fake_left
;
257 struct expression
*assign
;
259 left
= strip_expr(expr
->left
);
260 if (left
->type
!= EXPR_PREOP
|| left
->op
!= '*')
262 left
= strip_expr(left
->unop
);
263 if (left
->type
!= EXPR_POSTOP
)
266 fake_left
= deref_expression(strip_expr(left
->unop
));
267 assign
= assign_expression(fake_left
, expr
->right
);
269 __split_expr(assign
);
270 __split_expr(expr
->left
);
275 static int prev_expression_is_getting_address(struct expression
*expr
)
277 struct expression
*parent
;
280 parent
= expr
->parent
;
284 if (parent
->type
== EXPR_PREOP
&& parent
->op
== '&')
286 if (parent
->type
== EXPR_PREOP
&& parent
->op
== '(')
288 if (parent
->type
== EXPR_DEREF
&& parent
->op
== '.')
297 void __split_expr(struct expression
*expr
)
302 // sm_msg(" Debug expr_type %d %s", expr->type, show_special(expr->op));
304 if (__in_fake_assign
&& expr
->type
!= EXPR_ASSIGNMENT
)
306 if (__in_fake_assign
>= 4) /* don't allow too much nesting */
309 push_expression(&big_expression_stack
, expr
);
310 set_position(expr
->pos
);
311 __pass_to_client(expr
, EXPR_HOOK
);
313 switch (expr
->type
) {
315 set_parent_expr(expr
->unop
, expr
);
317 if (expr
->op
== '*' &&
318 !prev_expression_is_getting_address(expr
))
319 __pass_to_client(expr
, DEREF_HOOK
);
320 __split_expr(expr
->unop
);
321 __pass_to_client(expr
, OP_HOOK
);
324 set_parent_expr(expr
->unop
, expr
);
326 __split_expr(expr
->unop
);
327 push_expression(&post_op_stack
, expr
);
331 if (expr
->statement
&& !expr
->statement
->parent
) {
332 set_parent_stmt(expr
->statement
,
333 last_ptr_list((struct ptr_list
*)big_statement_stack
));
335 __split_stmt(expr
->statement
);
340 set_parent_expr(expr
->left
, expr
);
341 set_parent_expr(expr
->right
, expr
);
343 __pass_to_client(expr
, LOGIC_HOOK
);
344 __handle_logic(expr
);
347 set_parent_expr(expr
->left
, expr
);
348 set_parent_expr(expr
->right
, expr
);
350 __pass_to_client(expr
, BINOP_HOOK
);
352 set_parent_expr(expr
->left
, expr
);
353 set_parent_expr(expr
->right
, expr
);
355 __split_expr(expr
->left
);
356 __process_post_op_stack();
357 __split_expr(expr
->right
);
359 case EXPR_ASSIGNMENT
: {
360 struct expression
*right
;
362 set_parent_expr(expr
->left
, expr
);
363 set_parent_expr(expr
->right
, expr
);
368 right
= strip_expr(expr
->right
);
370 __pass_to_client(expr
, RAW_ASSIGNMENT_HOOK
);
373 if (__handle_condition_assigns(expr
))
375 /* foo = (x < 5 ? foo : 5); */
376 if (__handle_select_assigns(expr
))
378 /* foo = ({frob(); frob(); frob(); 1;}) */
379 if (__handle_expr_statement_assigns(expr
))
382 if (handle_comma_assigns(expr
))
384 if (handle_postop_assigns(expr
))
387 __split_expr(expr
->right
);
388 if (outside_of_function())
389 __pass_to_client(expr
, GLOBAL_ASSIGNMENT_HOOK
);
391 __pass_to_client(expr
, ASSIGNMENT_HOOK
);
393 __fake_struct_member_assignments(expr
);
395 if (expr
->op
== '=' && right
->type
== EXPR_CALL
)
396 __pass_to_client(expr
, CALL_ASSIGNMENT_HOOK
);
398 if (get_macro_name(right
->pos
) &&
399 get_macro_name(expr
->pos
) != get_macro_name(right
->pos
))
400 __pass_to_client(expr
, MACRO_ASSIGNMENT_HOOK
);
402 __pass_to_client(expr
, ASSIGNMENT_HOOK_AFTER
);
404 __split_expr(expr
->left
);
408 set_parent_expr(expr
->deref
, expr
);
410 __pass_to_client(expr
, DEREF_HOOK
);
411 __split_expr(expr
->deref
);
414 set_parent_expr(expr
->base
, expr
);
416 __split_expr(expr
->base
);
419 case EXPR_FORCE_CAST
:
420 set_parent_expr(expr
->cast_expression
, expr
);
422 __pass_to_client(expr
, CAST_HOOK
);
423 __split_expr(expr
->cast_expression
);
426 if (expr
->cast_expression
)
427 __pass_to_client(strip_parens(expr
->cast_expression
),
432 evaluate_expression(expr
);
434 case EXPR_CONDITIONAL
:
436 set_parent_expr(expr
->conditional
, expr
);
437 set_parent_expr(expr
->cond_true
, expr
);
438 set_parent_expr(expr
->cond_false
, expr
);
440 if (known_condition_true(expr
->conditional
)) {
441 __split_expr(expr
->cond_true
);
444 if (known_condition_false(expr
->conditional
)) {
445 __split_expr(expr
->cond_false
);
448 __pass_to_client(expr
, SELECT_HOOK
);
449 __split_whole_condition(expr
->conditional
);
450 __split_expr(expr
->cond_true
);
451 __push_true_states();
452 __use_false_states();
453 __split_expr(expr
->cond_false
);
454 __merge_true_states();
457 set_parent_expr(expr
->fn
, expr
);
459 if (sym_name_is("__builtin_constant_p", expr
->fn
))
461 split_expr_list(expr
->args
, expr
);
462 __split_expr(expr
->fn
);
463 if (is_inline_func(expr
->fn
))
464 add_inline_function(expr
->fn
->symbol
);
465 if (inlinable(expr
->fn
))
467 __process_post_op_stack();
468 __pass_to_client(expr
, FUNCTION_CALL_HOOK
);
470 if (inlinable(expr
->fn
)) {
473 __pass_to_client(expr
, CALL_HOOK_AFTER_INLINE
);
474 if (is_noreturn_func(expr
->fn
))
477 case EXPR_INITIALIZER
:
478 split_expr_list(expr
->expr_list
, expr
);
480 case EXPR_IDENTIFIER
:
481 set_parent_expr(expr
->ident_expression
, expr
);
482 __split_expr(expr
->ident_expression
);
485 set_parent_expr(expr
->idx_expression
, expr
);
486 __split_expr(expr
->idx_expression
);
489 set_parent_expr(expr
->init_expr
, expr
);
490 __split_expr(expr
->init_expr
);
493 __pass_to_client(expr
, SYM_HOOK
);
496 __pass_to_client(expr
, STRING_HOOK
);
501 pop_expression(&big_expression_stack
);
504 static int is_forever_loop(struct statement
*stmt
)
506 struct expression
*expr
;
509 expr
= strip_expr(stmt
->iterator_pre_condition
);
511 expr
= stmt
->iterator_post_condition
;
513 /* this is a for(;;) loop... */
517 if (get_value(expr
, &sval
) && sval
.value
!= 0)
524 static char *get_loop_name(int num
)
528 snprintf(buf
, 255, "-loop%d", num
);
530 return alloc_sname(buf
);
534 * Pre Loops are while and for loops.
536 static void handle_pre_loop(struct statement
*stmt
)
538 int once_through
; /* we go through the loop at least once */
539 struct sm_state
*extra_sm
= NULL
;
542 struct stree
*stree
= NULL
;
543 struct sm_state
*sm
= NULL
;
545 loop_name
= get_loop_name(loop_num
);
548 __split_stmt(stmt
->iterator_pre_statement
);
549 __prev_stmt
= stmt
->iterator_pre_statement
;
551 once_through
= implied_condition_true(stmt
->iterator_pre_condition
);
557 __merge_gotos(loop_name
, NULL
);
559 extra_sm
= __extra_handle_canonical_loops(stmt
, &stree
);
560 __in_pre_condition
++;
561 __pass_to_client(stmt
, PRELOOP_HOOK
);
562 __split_whole_condition(stmt
->iterator_pre_condition
);
563 __in_pre_condition
--;
564 FOR_EACH_SM(stree
, sm
) {
565 set_state(sm
->owner
, sm
->name
, sm
->sym
, sm
->state
);
566 } END_FOR_EACH_SM(sm
);
569 extra_sm
= get_sm_state(extra_sm
->owner
, extra_sm
->name
, extra_sm
->sym
);
571 if (option_assume_loops
)
574 __split_stmt(stmt
->iterator_statement
);
575 if (is_forever_loop(stmt
)) {
577 __save_gotos(loop_name
, NULL
);
579 __push_fake_cur_stree();
580 __split_stmt(stmt
->iterator_post_statement
);
581 stree
= __pop_fake_cur_stree();
583 __discard_false_states();
586 if (!__path_is_null())
587 __merge_stree_into_cur(stree
);
591 unchanged
= __iterator_unchanged(extra_sm
);
592 __split_stmt(stmt
->iterator_post_statement
);
593 __prev_stmt
= stmt
->iterator_post_statement
;
596 __save_gotos(loop_name
, NULL
);
597 __in_pre_condition
++;
598 __split_whole_condition(stmt
->iterator_pre_condition
);
599 __in_pre_condition
--;
601 __merge_false_states();
603 __discard_false_states();
605 __merge_false_states();
607 if (extra_sm
&& unchanged
)
608 __extra_pre_loop_hook_after(extra_sm
,
609 stmt
->iterator_post_statement
,
610 stmt
->iterator_pre_condition
);
617 * Post loops are do {} while();
619 static void handle_post_loop(struct statement
*stmt
)
623 loop_name
= get_loop_name(loop_num
);
629 __merge_gotos(loop_name
, NULL
);
630 __split_stmt(stmt
->iterator_statement
);
632 if (!is_zero(stmt
->iterator_post_condition
))
633 __save_gotos(loop_name
, NULL
);
635 if (is_forever_loop(stmt
)) {
638 __split_whole_condition(stmt
->iterator_post_condition
);
639 __use_false_states();
645 static int empty_statement(struct statement
*stmt
)
649 if (stmt
->type
== STMT_EXPRESSION
&& !stmt
->expression
)
654 static int last_stmt_on_same_line(void)
656 struct statement
*stmt
;
659 FOR_EACH_PTR_REVERSE(big_statement_stack
, stmt
) {
662 if (stmt
->pos
.line
== get_lineno())
665 } END_FOR_EACH_PTR_REVERSE(stmt
);
669 static void split_asm_constraints(struct expression_list
*expr_list
)
671 struct expression
*expr
;
674 FOR_EACH_PTR(expr_list
, expr
) {
676 case 0: /* identifier */
677 case 1: /* constraint */
680 case 2: /* expression */
685 } END_FOR_EACH_PTR(expr
);
688 static int is_case_val(struct statement
*stmt
, sval_t sval
)
692 if (stmt
->type
!= STMT_CASE
)
694 if (!stmt
->case_expression
) {
698 if (!get_value(stmt
->case_expression
, &case_sval
))
700 if (case_sval
.value
== sval
.value
)
705 static struct range_list
*get_case_rl(struct expression
*switch_expr
,
706 struct expression
*case_expr
,
707 struct expression
*case_to
)
710 struct range_list
*rl
= NULL
;
711 struct symbol
*switch_type
;
713 switch_type
= get_type(switch_expr
);
714 if (get_value(case_to
, &end
) && get_value(case_expr
, &start
)) {
715 start
= sval_cast(switch_type
, start
);
716 end
= sval_cast(switch_type
, end
);
717 add_range(&rl
, start
, end
);
718 } else if (get_value(case_expr
, &start
)) {
719 start
= sval_cast(switch_type
, start
);
720 add_range(&rl
, start
, start
);
726 static void split_known_switch(struct statement
*stmt
, sval_t sval
)
728 struct statement
*tmp
;
729 struct range_list
*rl
;
731 __split_expr(stmt
->switch_expression
);
732 sval
= sval_cast(get_type(stmt
->switch_expression
), sval
);
734 push_expression(&switch_expr_stack
, stmt
->switch_expression
);
735 __save_switch_states(top_expression(switch_expr_stack
));
740 stmt
= stmt
->switch_statement
;
742 __push_scope_hooks();
743 FOR_EACH_PTR(stmt
->stmts
, tmp
) {
744 __smatch_lineno
= tmp
->pos
.line
;
745 if (is_case_val(tmp
, sval
)) {
746 rl
= alloc_rl(sval
, sval
);
747 __merge_switches(top_expression(switch_expr_stack
), rl
);
748 __pass_case_to_client(top_expression(switch_expr_stack
), rl
);
750 if (__path_is_null())
753 if (__path_is_null()) {
757 } END_FOR_EACH_PTR(tmp
);
759 __call_scope_hooks();
760 if (!__pop_default())
761 __merge_switches(top_expression(switch_expr_stack
), NULL
);
762 __discard_switches();
764 pop_expression(&switch_expr_stack
);
767 static void split_case(struct statement
*stmt
)
769 struct range_list
*rl
= NULL
;
771 rl
= get_case_rl(top_expression(switch_expr_stack
),
772 stmt
->case_expression
, stmt
->case_to
);
773 while (stmt
->case_statement
->type
== STMT_CASE
) {
774 struct range_list
*tmp
;
776 tmp
= get_case_rl(top_expression(switch_expr_stack
),
777 stmt
->case_statement
->case_expression
,
778 stmt
->case_statement
->case_to
);
781 rl
= rl_union(rl
, tmp
);
782 if (!stmt
->case_expression
)
784 stmt
= stmt
->case_statement
;
787 __merge_switches(top_expression(switch_expr_stack
), rl
);
789 if (!stmt
->case_expression
)
791 __split_stmt(stmt
->case_statement
);
794 static int taking_too_long(void)
798 ms
= ms_since(&fn_start_time
);
799 if (ms
> 1000 * 60 * 5) /* five minutes */
804 static int is_last_stmt(struct statement
*cur_stmt
)
806 struct symbol
*fn
= get_base_type(cur_func_sym
);
807 struct statement
*stmt
;
813 stmt
= fn
->inline_stmt
;
814 if (!stmt
|| stmt
->type
!= STMT_COMPOUND
)
816 stmt
= last_ptr_list((struct ptr_list
*)stmt
->stmts
);
817 if (stmt
&& stmt
->type
== STMT_LABEL
)
818 stmt
= stmt
->label_statement
;
819 if (stmt
== cur_stmt
)
824 static void handle_backward_goto(struct statement
*goto_stmt
)
826 const char *goto_name
, *label_name
;
827 struct statement
*func_stmt
;
828 struct symbol
*base_type
= get_base_type(cur_func_sym
);
829 struct statement
*tmp
;
834 if (last_goto_statement_handled
)
836 last_goto_statement_handled
= 1;
838 if (!goto_stmt
->goto_label
||
839 goto_stmt
->goto_label
->type
!= SYM_LABEL
||
840 !goto_stmt
->goto_label
->ident
)
842 goto_name
= goto_stmt
->goto_label
->ident
->name
;
844 func_stmt
= base_type
->stmt
;
846 func_stmt
= base_type
->inline_stmt
;
849 if (func_stmt
->type
!= STMT_COMPOUND
)
852 FOR_EACH_PTR(func_stmt
->stmts
, tmp
) {
854 if (tmp
->type
!= STMT_LABEL
)
856 if (!tmp
->label_identifier
||
857 tmp
->label_identifier
->type
!= SYM_LABEL
||
858 !tmp
->label_identifier
->ident
)
860 label_name
= tmp
->label_identifier
->ident
->name
;
861 if (strcmp(goto_name
, label_name
) != 0)
866 } END_FOR_EACH_PTR(tmp
);
869 static void fake_a_return(void)
871 struct symbol
*return_type
;
876 return_type
= get_real_base_type(cur_func_sym
);
877 return_type
= get_real_base_type(return_type
);
878 if (return_type
!= &void_ctype
) {
879 __pass_to_client(unknown_value_expression(NULL
), RETURN_HOOK
);
884 static void fake_an_empty_default(struct position pos
)
886 static struct statement none
= {};
889 none
.type
= STMT_NONE
;
890 __merge_switches(top_expression(switch_expr_stack
), NULL
);
894 static void split_compound(struct statement
*stmt
)
896 struct statement
*prev
= NULL
;
897 struct statement
*cur
= NULL
;
898 struct statement
*next
;
900 __push_scope_hooks();
902 FOR_EACH_PTR(stmt
->stmts
, next
) {
903 /* just set them all ahead of time */
904 set_parent_stmt(next
, stmt
);
914 } END_FOR_EACH_PTR(next
);
923 * For function scope, then delay calling the scope hooks until the
924 * end of function hooks can run. I'm not positive this is the right
927 if (!is_last_stmt(cur
))
928 __call_scope_hooks();
932 * This is a hack, work around for detecting empty functions.
934 static int need_delayed_scope_hooks(void)
936 struct symbol
*fn
= get_base_type(cur_func_sym
);
937 struct statement
*stmt
;
943 stmt
= fn
->inline_stmt
;
944 if (stmt
&& stmt
->type
== STMT_COMPOUND
)
949 void __split_label_stmt(struct statement
*stmt
)
951 if (stmt
->label_identifier
&&
952 stmt
->label_identifier
->type
== SYM_LABEL
&&
953 stmt
->label_identifier
->ident
) {
954 loop_count
|= 0x80000000;
955 __merge_gotos(stmt
->label_identifier
->ident
->name
, stmt
->label_identifier
);
959 static void find_asm_gotos(struct statement
*stmt
)
963 FOR_EACH_PTR(stmt
->asm_labels
, sym
) {
964 __save_gotos(sym
->ident
->name
, sym
);
965 } END_FOR_EACH_PTR(sym
);
968 void __split_stmt(struct statement
*stmt
)
975 if (__bail_on_rest_of_function
)
978 if (out_of_memory() || taking_too_long()) {
980 __bail_on_rest_of_function
= 1;
982 sm_msg("Function too hairy. Giving up.");
984 final_pass
= 0; /* turn off sm_msg() from here */
988 add_ptr_list(&big_statement_stack
, stmt
);
989 free_expression_stack(&big_expression_stack
);
990 set_position(stmt
->pos
);
991 __pass_to_client(stmt
, STMT_HOOK
);
993 switch (stmt
->type
) {
994 case STMT_DECLARATION
:
995 split_declaration(stmt
->declaration
);
998 __split_expr(stmt
->ret_value
);
999 __pass_to_client(stmt
->ret_value
, RETURN_HOOK
);
1000 __process_post_op_stack();
1003 case STMT_EXPRESSION
:
1004 __split_expr(stmt
->expression
);
1007 split_compound(stmt
);
1010 set_parent_stmt(stmt
->if_true
, stmt
);
1011 set_parent_stmt(stmt
->if_false
, stmt
);
1013 if (known_condition_true(stmt
->if_conditional
)) {
1014 __split_stmt(stmt
->if_true
);
1017 if (known_condition_false(stmt
->if_conditional
)) {
1018 __split_stmt(stmt
->if_false
);
1021 __split_whole_condition(stmt
->if_conditional
);
1022 __split_stmt(stmt
->if_true
);
1023 if (empty_statement(stmt
->if_true
) &&
1024 last_stmt_on_same_line() &&
1025 !get_macro_name(stmt
->if_true
->pos
))
1026 sm_msg("warn: if();");
1027 __push_true_states();
1028 __use_false_states();
1029 __split_stmt(stmt
->if_false
);
1030 __merge_true_states();
1033 set_parent_stmt(stmt
->iterator_pre_statement
, stmt
);
1034 set_parent_stmt(stmt
->iterator_statement
, stmt
);
1035 set_parent_stmt(stmt
->iterator_post_statement
, stmt
);
1037 if (stmt
->iterator_pre_condition
)
1038 handle_pre_loop(stmt
);
1039 else if (stmt
->iterator_post_condition
)
1040 handle_post_loop(stmt
);
1042 // these are for(;;) type loops.
1043 handle_pre_loop(stmt
);
1047 set_parent_stmt(stmt
->switch_statement
, stmt
);
1049 if (get_value(stmt
->switch_expression
, &sval
)) {
1050 split_known_switch(stmt
, sval
);
1053 __split_expr(stmt
->switch_expression
);
1054 push_expression(&switch_expr_stack
, stmt
->switch_expression
);
1055 __save_switch_states(top_expression(switch_expr_stack
));
1059 __split_stmt(stmt
->switch_statement
);
1060 if (!__pop_default())
1061 fake_an_empty_default(stmt
->pos
);
1062 __discard_switches();
1064 pop_expression(&switch_expr_stack
);
1070 __split_label_stmt(stmt
);
1071 __split_stmt(stmt
->label_statement
);
1074 __split_expr(stmt
->goto_expression
);
1075 if (stmt
->goto_label
&& stmt
->goto_label
->type
== SYM_NODE
) {
1076 if (!strcmp(stmt
->goto_label
->ident
->name
, "break")) {
1078 } else if (!strcmp(stmt
->goto_label
->ident
->name
,
1080 __process_continues();
1082 } else if (stmt
->goto_label
&&
1083 stmt
->goto_label
->type
== SYM_LABEL
&&
1084 stmt
->goto_label
->ident
) {
1085 __save_gotos(stmt
->goto_label
->ident
->name
, stmt
->goto_label
);
1088 if (is_last_stmt(stmt
))
1089 handle_backward_goto(stmt
);
1094 find_asm_gotos(stmt
);
1095 __pass_to_client(stmt
, ASM_HOOK
);
1096 __split_expr(stmt
->asm_string
);
1097 split_asm_constraints(stmt
->asm_outputs
);
1098 split_asm_constraints(stmt
->asm_inputs
);
1099 split_asm_constraints(stmt
->asm_clobbers
);
1104 __split_expr(stmt
->range_expression
);
1105 __split_expr(stmt
->range_low
);
1106 __split_expr(stmt
->range_high
);
1109 __pass_to_client(stmt
, STMT_HOOK_AFTER
);
1111 __process_post_op_stack();
1114 static void split_expr_list(struct expression_list
*expr_list
, struct expression
*parent
)
1116 struct expression
*expr
;
1118 FOR_EACH_PTR(expr_list
, expr
) {
1119 set_parent_expr(expr
, parent
);
1121 __process_post_op_stack();
1122 } END_FOR_EACH_PTR(expr
);
1125 static void split_sym(struct symbol
*sym
)
1129 if (!(sym
->namespace & NS_SYMBOL
))
1132 __split_stmt(sym
->stmt
);
1133 __split_expr(sym
->array_size
);
1134 split_symlist(sym
->arguments
);
1135 split_symlist(sym
->symbol_list
);
1136 __split_stmt(sym
->inline_stmt
);
1137 split_symlist(sym
->inline_symbol_list
);
1140 static void split_symlist(struct symbol_list
*sym_list
)
1144 FOR_EACH_PTR(sym_list
, sym
) {
1146 } END_FOR_EACH_PTR(sym
);
1149 typedef void (fake_cb
)(struct expression
*expr
);
1151 static int member_to_number(struct expression
*expr
, struct ident
*member
)
1153 struct symbol
*type
, *tmp
;
1159 name
= member
->name
;
1161 type
= get_type(expr
);
1162 if (!type
|| type
->type
!= SYM_STRUCT
)
1166 FOR_EACH_PTR(type
->symbol_list
, tmp
) {
1170 if (strcmp(name
, tmp
->ident
->name
) == 0)
1172 } END_FOR_EACH_PTR(tmp
);
1176 static struct ident
*number_to_member(struct expression
*expr
, int num
)
1178 struct symbol
*type
, *member
;
1181 type
= get_type(expr
);
1182 if (!type
|| type
->type
!= SYM_STRUCT
)
1185 FOR_EACH_PTR(type
->symbol_list
, member
) {
1187 return member
->ident
;
1189 } END_FOR_EACH_PTR(member
);
1193 static void fake_element_assigns_helper(struct expression
*array
, struct expression_list
*expr_list
, fake_cb
*fake_cb
);
1195 static void set_inner_struct_members(struct expression
*expr
, struct symbol
*member
)
1197 struct expression
*edge_member
, *assign
;
1198 struct symbol
*base
= get_real_base_type(member
);
1202 expr
= member_expression(expr
, '.', member
->ident
);
1204 FOR_EACH_PTR(base
->symbol_list
, tmp
) {
1205 struct symbol
*type
;
1207 type
= get_real_base_type(tmp
);
1211 edge_member
= member_expression(expr
, '.', tmp
->ident
);
1212 if (get_state_expr(SMATCH_EXTRA
, edge_member
))
1215 if (type
->type
== SYM_UNION
|| type
->type
== SYM_STRUCT
) {
1216 set_inner_struct_members(expr
, tmp
);
1223 assign
= assign_expression(edge_member
, zero_expr());
1224 __split_expr(assign
);
1225 } END_FOR_EACH_PTR(tmp
);
1230 static void set_unset_to_zero(struct symbol
*type
, struct expression
*expr
)
1233 struct expression
*member
= NULL
;
1234 struct expression
*assign
;
1237 if (expr
->type
== EXPR_PREOP
&& expr
->op
== '&') {
1238 expr
= strip_expr(expr
->unop
);
1242 FOR_EACH_PTR(type
->symbol_list
, tmp
) {
1243 type
= get_real_base_type(tmp
);
1248 member
= member_expression(expr
, op
, tmp
->ident
);
1249 if (get_state_expr(SMATCH_EXTRA
, member
))
1253 if (type
->type
== SYM_UNION
|| type
->type
== SYM_STRUCT
) {
1254 set_inner_struct_members(expr
, tmp
);
1257 if (type
->type
== SYM_ARRAY
)
1262 assign
= assign_expression(member
, zero_expr());
1263 __split_expr(assign
);
1264 } END_FOR_EACH_PTR(tmp
);
1267 static void fake_member_assigns_helper(struct expression
*symbol
, struct expression_list
*members
, fake_cb
*fake_cb
)
1269 struct expression
*deref
, *assign
, *tmp
, *right
;
1270 struct symbol
*struct_type
, *type
;
1271 struct ident
*member
;
1274 struct_type
= get_type(symbol
);
1276 (struct_type
->type
!= SYM_STRUCT
&& struct_type
->type
!= SYM_UNION
))
1280 * We're parsing an initializer that could look something like this:
1281 * struct foo foo = {
1283 * .whatever.xxx = 11,
1287 * So what we have here is a list with 42, .whatever, and .zzz. We need
1288 * to break it up into left and right sides of the assignments.
1292 FOR_EACH_PTR(members
, tmp
) {
1294 if (tmp
->type
== EXPR_IDENTIFIER
) {
1295 member_idx
= member_to_number(symbol
, tmp
->expr_ident
);
1296 while (tmp
->type
== EXPR_IDENTIFIER
) {
1297 member
= tmp
->expr_ident
;
1298 tmp
= tmp
->ident_expression
;
1300 deref
= member_expression(deref
, '.', member
);
1302 deref
= member_expression(symbol
, '.', member
);
1305 member
= number_to_member(symbol
, member_idx
);
1306 deref
= member_expression(symbol
, '.', member
);
1310 if (right
->type
== EXPR_INITIALIZER
) {
1311 type
= get_type(deref
);
1312 if (type
&& type
->type
== SYM_ARRAY
)
1313 fake_element_assigns_helper(deref
, right
->expr_list
, fake_cb
);
1315 fake_member_assigns_helper(deref
, right
->expr_list
, fake_cb
);
1317 assign
= assign_expression(deref
, right
);
1320 } END_FOR_EACH_PTR(tmp
);
1322 set_unset_to_zero(struct_type
, symbol
);
1325 static void fake_member_assigns(struct symbol
*sym
, fake_cb
*fake_cb
)
1327 fake_member_assigns_helper(symbol_expression(sym
),
1328 sym
->initializer
->expr_list
, fake_cb
);
1331 static void fake_element_assigns_helper(struct expression
*array
, struct expression_list
*expr_list
, fake_cb
*fake_cb
)
1333 struct expression
*offset
, *binop
, *assign
, *tmp
;
1334 struct symbol
*type
;
1337 if (ptr_list_size((struct ptr_list
*)expr_list
) > 1000)
1341 FOR_EACH_PTR(expr_list
, tmp
) {
1342 if (tmp
->type
== EXPR_INDEX
) {
1343 if (tmp
->idx_from
!= tmp
->idx_to
)
1345 idx
= tmp
->idx_from
;
1346 if (!tmp
->idx_expression
)
1348 tmp
= tmp
->idx_expression
;
1350 offset
= value_expr(idx
);
1351 binop
= array_element_expression(array
, offset
);
1352 if (tmp
->type
== EXPR_INITIALIZER
) {
1353 type
= get_type(binop
);
1354 if (type
&& type
->type
== SYM_ARRAY
)
1355 fake_element_assigns_helper(binop
, tmp
->expr_list
, fake_cb
);
1357 fake_member_assigns_helper(binop
, tmp
->expr_list
, fake_cb
);
1359 assign
= assign_expression(binop
, tmp
);
1364 } END_FOR_EACH_PTR(tmp
);
1367 static void fake_element_assigns(struct symbol
*sym
, fake_cb
*fake_cb
)
1369 fake_element_assigns_helper(symbol_expression(sym
), sym
->initializer
->expr_list
, fake_cb
);
1372 static void fake_assign_expr(struct symbol
*sym
)
1374 struct expression
*assign
, *symbol
;
1376 symbol
= symbol_expression(sym
);
1377 assign
= assign_expression(symbol
, sym
->initializer
);
1378 __split_expr(assign
);
1381 static void call_split_expr(struct expression
*expr
)
1386 static void do_initializer_stuff(struct symbol
*sym
)
1388 if (!sym
->initializer
)
1391 if (sym
->initializer
->type
== EXPR_INITIALIZER
) {
1392 if (get_real_base_type(sym
)->type
== SYM_ARRAY
)
1393 fake_element_assigns(sym
, call_split_expr
);
1395 fake_member_assigns(sym
, call_split_expr
);
1397 fake_assign_expr(sym
);
1401 static void split_declaration(struct symbol_list
*sym_list
)
1405 FOR_EACH_PTR(sym_list
, sym
) {
1406 __pass_to_client(sym
, DECLARATION_HOOK
);
1407 do_initializer_stuff(sym
);
1409 } END_FOR_EACH_PTR(sym
);
1412 static void call_global_assign_hooks(struct expression
*assign
)
1414 __pass_to_client(assign
, GLOBAL_ASSIGNMENT_HOOK
);
1417 static void fake_global_assign(struct symbol
*sym
)
1419 struct expression
*assign
, *symbol
;
1421 if (get_real_base_type(sym
)->type
== SYM_ARRAY
) {
1422 if (sym
->initializer
&& sym
->initializer
->type
== EXPR_INITIALIZER
) {
1423 fake_element_assigns(sym
, call_global_assign_hooks
);
1424 } else if (sym
->initializer
) {
1425 symbol
= symbol_expression(sym
);
1426 assign
= assign_expression(symbol
, sym
->initializer
);
1427 __pass_to_client(assign
, GLOBAL_ASSIGNMENT_HOOK
);
1429 fake_element_assigns_helper(symbol_expression(sym
), NULL
, call_global_assign_hooks
);
1431 } else if (get_real_base_type(sym
)->type
== SYM_STRUCT
) {
1432 if (sym
->initializer
&& sym
->initializer
->type
== EXPR_INITIALIZER
) {
1433 fake_member_assigns(sym
, call_global_assign_hooks
);
1434 } else if (sym
->initializer
) {
1435 symbol
= symbol_expression(sym
);
1436 assign
= assign_expression(symbol
, sym
->initializer
);
1437 __pass_to_client(assign
, GLOBAL_ASSIGNMENT_HOOK
);
1439 fake_member_assigns_helper(symbol_expression(sym
), NULL
, call_global_assign_hooks
);
1442 symbol
= symbol_expression(sym
);
1443 if (sym
->initializer
)
1444 assign
= assign_expression(symbol
, sym
->initializer
);
1446 assign
= assign_expression(symbol
, zero_expr());
1447 __pass_to_client(assign
, GLOBAL_ASSIGNMENT_HOOK
);
1451 static void start_function_definition(struct symbol
*sym
)
1453 __in_function_def
= 1;
1454 __pass_to_client(sym
, FUNC_DEF_HOOK
);
1455 __in_function_def
= 0;
1456 __pass_to_client(sym
, AFTER_DEF_HOOK
);
1460 static void split_function(struct symbol
*sym
)
1462 struct symbol
*base_type
= get_base_type(sym
);
1464 if (!base_type
->stmt
&& !base_type
->inline_stmt
)
1467 gettimeofday(&fn_start_time
, NULL
);
1470 cur_func
= sym
->ident
->name
;
1471 set_position(sym
->pos
);
1473 last_goto_statement_handled
= 0;
1474 sm_debug("new function: %s\n", cur_func
);
1476 if (option_two_passes
) {
1480 start_function_definition(sym
);
1481 __split_stmt(base_type
->stmt
);
1482 __split_stmt(base_type
->inline_stmt
);
1488 start_function_definition(sym
);
1489 __split_stmt(base_type
->stmt
);
1490 __split_stmt(base_type
->inline_stmt
);
1491 __pass_to_client(sym
, END_FUNC_HOOK
);
1492 if (need_delayed_scope_hooks())
1493 __call_scope_hooks();
1494 __pass_to_client(sym
, AFTER_FUNC_HOOK
);
1497 cur_func_sym
= NULL
;
1499 free_data_info_allocs();
1500 free_expression_stack(&switch_expr_stack
);
1501 __free_ptr_list((struct ptr_list
**)&big_statement_stack
);
1502 __bail_on_rest_of_function
= 0;
1505 static void parse_inline(struct expression
*call
)
1507 struct symbol
*base_type
;
1508 int loop_num_bak
= loop_num
;
1509 int loop_count_bak
= loop_count
;
1510 int final_pass_bak
= final_pass
;
1511 char *cur_func_bak
= cur_func
;
1512 struct statement_list
*big_statement_stack_bak
= big_statement_stack
;
1513 struct expression_list
*big_expression_stack_bak
= big_expression_stack
;
1514 struct expression_list
*big_condition_stack_bak
= big_condition_stack
;
1515 struct expression_list
*switch_expr_stack_bak
= switch_expr_stack
;
1516 struct symbol
*cur_func_sym_bak
= cur_func_sym
;
1518 __pass_to_client(call
, INLINE_FN_START
);
1519 final_pass
= 0; /* don't print anything */
1522 base_type
= get_base_type(call
->fn
->symbol
);
1523 cur_func_sym
= call
->fn
->symbol
;
1524 if (call
->fn
->symbol
->ident
)
1525 cur_func
= call
->fn
->symbol
->ident
->name
;
1528 set_position(call
->fn
->symbol
->pos
);
1531 big_statement_stack
= NULL
;
1532 big_expression_stack
= NULL
;
1533 big_condition_stack
= NULL
;
1534 switch_expr_stack
= NULL
;
1536 sm_debug("inline function: %s\n", cur_func
);
1539 start_function_definition(call
->fn
->symbol
);
1540 __split_stmt(base_type
->stmt
);
1541 __split_stmt(base_type
->inline_stmt
);
1542 __pass_to_client(call
->fn
->symbol
, END_FUNC_HOOK
);
1543 __pass_to_client(call
->fn
->symbol
, AFTER_FUNC_HOOK
);
1545 free_expression_stack(&switch_expr_stack
);
1546 __free_ptr_list((struct ptr_list
**)&big_statement_stack
);
1550 loop_num
= loop_num_bak
;
1551 loop_count
= loop_count_bak
;
1552 final_pass
= final_pass_bak
;
1553 cur_func_sym
= cur_func_sym_bak
;
1554 cur_func
= cur_func_bak
;
1555 big_statement_stack
= big_statement_stack_bak
;
1556 big_expression_stack
= big_expression_stack_bak
;
1557 big_condition_stack
= big_condition_stack_bak
;
1558 switch_expr_stack
= switch_expr_stack_bak
;
1560 restore_all_states();
1561 set_position(call
->pos
);
1563 __pass_to_client(call
, INLINE_FN_END
);
1566 static struct symbol_list
*inlines_called
;
1567 static void add_inline_function(struct symbol
*sym
)
1569 static struct symbol_list
*already_added
;
1572 FOR_EACH_PTR(already_added
, tmp
) {
1575 } END_FOR_EACH_PTR(tmp
);
1577 add_ptr_list(&already_added
, sym
);
1578 add_ptr_list(&inlines_called
, sym
);
1581 static void process_inlines(void)
1585 FOR_EACH_PTR(inlines_called
, tmp
) {
1586 split_function(tmp
);
1587 } END_FOR_EACH_PTR(tmp
);
1588 free_ptr_list(&inlines_called
);
1591 static struct symbol
*get_last_scoped_symbol(struct symbol_list
*big_list
, int use_static
)
1595 FOR_EACH_PTR_REVERSE(big_list
, sym
) {
1598 if (use_static
&& sym
->ctype
.modifiers
& MOD_STATIC
)
1600 if (!use_static
&& !(sym
->ctype
.modifiers
& MOD_STATIC
))
1602 } END_FOR_EACH_PTR_REVERSE(sym
);
1607 static void split_inlines_in_scope(struct symbol
*sym
)
1609 struct symbol
*base
;
1610 struct symbol_list
*scope_list
;
1613 scope_list
= sym
->scope
->symbols
;
1614 stream
= sym
->pos
.stream
;
1616 /* find the last static symbol in the file */
1617 FOR_EACH_PTR_REVERSE(scope_list
, sym
) {
1618 if (sym
->pos
.stream
!= stream
)
1620 if (sym
->type
!= SYM_NODE
)
1622 base
= get_base_type(sym
);
1625 if (base
->type
!= SYM_FN
)
1627 if (!base
->inline_stmt
)
1629 add_inline_function(sym
);
1630 } END_FOR_EACH_PTR_REVERSE(sym
);
1635 static void split_inlines(struct symbol_list
*sym_list
)
1639 sym
= get_last_scoped_symbol(sym_list
, 0);
1641 split_inlines_in_scope(sym
);
1642 sym
= get_last_scoped_symbol(sym_list
, 1);
1644 split_inlines_in_scope(sym
);
1647 static struct stree
*clone_estates_perm(struct stree
*orig
)
1649 struct stree
*ret
= NULL
;
1650 struct sm_state
*tmp
;
1652 FOR_EACH_SM(orig
, tmp
) {
1653 set_state_stree_perm(&ret
, tmp
->owner
, tmp
->name
, tmp
->sym
, clone_estate_perm(tmp
->state
));
1654 } END_FOR_EACH_SM(tmp
);
1659 struct position last_pos
;
1660 static void split_functions(struct symbol_list
*sym_list
)
1665 FOR_EACH_PTR(sym_list
, sym
) {
1666 set_position(sym
->pos
);
1667 if (sym
->type
!= SYM_NODE
|| get_base_type(sym
)->type
!= SYM_FN
) {
1668 __pass_to_client(sym
, BASE_HOOK
);
1669 fake_global_assign(sym
);
1671 } END_FOR_EACH_PTR(sym
);
1672 global_states
= clone_estates_perm(get_all_states_stree(SMATCH_EXTRA
));
1675 FOR_EACH_PTR(sym_list
, sym
) {
1676 set_position(sym
->pos
);
1677 if (sym
->type
== SYM_NODE
&& get_base_type(sym
)->type
== SYM_FN
) {
1678 split_function(sym
);
1681 last_pos
= sym
->pos
;
1682 } END_FOR_EACH_PTR(sym
);
1683 split_inlines(sym_list
);
1684 __pass_to_client(sym_list
, END_FILE_HOOK
);
1687 void smatch(int argc
, char **argv
)
1689 struct string_list
*filelist
= NULL
;
1690 struct symbol_list
*sym_list
;
1691 struct timeval stop
, start
;
1693 gettimeofday(&start
, NULL
);
1696 printf("Usage: smatch [--debug] <filename.c>\n");
1699 sparse_initialize(argc
, argv
, &filelist
);
1700 set_valid_ptr_max();
1701 FOR_EACH_PTR_NOTAG(filelist
, base_file
) {
1702 if (option_file_output
) {
1705 snprintf(buf
, sizeof(buf
), "%s.smatch", base_file
);
1706 sm_outfd
= fopen(buf
, "w");
1708 printf("Error: Cannot open %s\n", base_file
);
1712 sym_list
= sparse_keep_tokens(base_file
);
1713 split_functions(sym_list
);
1714 } END_FOR_EACH_PTR_NOTAG(base_file
);
1716 gettimeofday(&stop
, NULL
);
1718 set_position(last_pos
);
1720 sm_msg("time: %lu", stop
.tv_sec
- start
.tv_sec
);