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 int __in_fake_struct_assign
;
30 int __in_fake_var_assign
;
35 struct expression
*__inline_fn
;
37 int __smatch_lineno
= 0;
39 static char *base_file
;
40 static const char *filename
;
41 static char *pathname
;
42 static char *full_filename
;
43 static char *full_base_file
;
44 static char *cur_func
;
46 static unsigned int loop_count
;
47 static int last_goto_statement_handled
;
48 int __expr_stmt_count
;
49 int __in_function_def
;
50 int __in_unmatched_hook
;
51 static struct expression_list
*switch_expr_stack
= NULL
;
52 static struct expression_list
*post_op_stack
= NULL
;
54 static struct ptr_list
*fn_data_list
;
55 static struct ptr_list
*backup
;
57 struct expression_list
*big_expression_stack
;
58 struct statement_list
*big_statement_stack
;
59 struct statement
*__prev_stmt
;
60 struct statement
*__cur_stmt
;
61 struct statement
*__next_stmt
;
62 int __in_pre_condition
= 0;
63 int __bail_on_rest_of_function
= 0;
64 static struct timeval fn_start_time
;
65 static struct timeval outer_fn_start_time
;
66 char *get_function(void) { return cur_func
; }
67 int get_lineno(void) { return __smatch_lineno
; }
68 int inside_loop(void) { return !!loop_count
; }
69 int definitely_inside_loop(void) { return !!(loop_count
& ~0x08000000); }
70 struct expression
*get_switch_expr(void) { return top_expression(switch_expr_stack
); }
71 int in_expression_statement(void) { return !!__expr_stmt_count
; }
73 static void split_symlist(struct symbol_list
*sym_list
);
74 static void split_declaration(struct symbol_list
*sym_list
);
75 static void split_expr_list(struct expression_list
*expr_list
, struct expression
*parent
);
76 static void split_args(struct expression
*expr
);
77 static struct expression
*fake_a_variable_assign(struct symbol
*type
, struct expression
*call
, struct expression
*expr
, int nr
);
78 static void add_inline_function(struct symbol
*sym
);
79 static void parse_inline(struct expression
*expr
);
81 int option_assume_loops
= 0;
82 int option_two_passes
= 0;
83 struct symbol
*cur_func_sym
= NULL
;
84 struct stree
*global_states
;
86 const unsigned long valid_ptr_min
= 4096;
87 unsigned long valid_ptr_max
= ULONG_MAX
& ~(MTAG_OFFSET_MASK
);
88 const sval_t valid_ptr_min_sval
= {
92 sval_t valid_ptr_max_sval
= {
94 {.value
= ULONG_MAX
& ~(MTAG_OFFSET_MASK
)},
96 struct range_list
*valid_ptr_rl
;
98 void alloc_valid_ptr_rl(void)
100 valid_ptr_max
= sval_type_max(&ulong_ctype
).value
& ~(MTAG_OFFSET_MASK
);
101 valid_ptr_max_sval
.value
= valid_ptr_max
;
103 valid_ptr_rl
= alloc_rl(valid_ptr_min_sval
, valid_ptr_max_sval
);
104 valid_ptr_rl
= cast_rl(&ptr_ctype
, valid_ptr_rl
);
105 valid_ptr_rl
= clone_rl_permanent(valid_ptr_rl
);
108 int outside_of_function(void)
110 return cur_func_sym
== NULL
;
113 const char *get_filename(void)
115 if (option_info
&& option_full_path
)
116 return full_base_file
;
119 if (option_full_path
)
120 return full_filename
;
124 const char *get_base_file(void)
126 if (option_full_path
)
127 return full_base_file
;
131 static void set_position(struct position pos
)
134 static int prev_stream
= -1;
139 if (pos
.stream
== 0 && pos
.line
== 0)
142 __smatch_lineno
= pos
.line
;
144 if (pos
.stream
== prev_stream
)
147 filename
= stream_name(pos
.stream
);
150 pathname
= getcwd(NULL
, 0);
152 len
= strlen(pathname
) + 1 + strlen(filename
) + 1;
153 full_filename
= malloc(len
);
154 snprintf(full_filename
, len
, "%s/%s", pathname
, filename
);
156 full_filename
= alloc_string(filename
);
161 int is_assigned_call(struct expression
*expr
)
163 struct expression
*parent
= expr_get_parent_expr(expr
);
166 parent
->type
== EXPR_ASSIGNMENT
&&
168 strip_expr(parent
->right
) == expr
)
174 int is_fake_assigned_call(struct expression
*expr
)
176 struct expression
*parent
= expr_get_fake_parent_expr(expr
);
179 parent
->type
== EXPR_ASSIGNMENT
&&
181 strip_expr(parent
->right
) == expr
)
187 static bool is_inline_func(struct expression
*expr
)
189 if (expr
->type
!= EXPR_SYMBOL
|| !expr
->symbol
)
191 if (!expr
->symbol
->definition
)
193 if (expr
->symbol
->definition
->ctype
.modifiers
& MOD_INLINE
)
199 static int is_noreturn_func(struct expression
*expr
)
201 if (expr
->type
!= EXPR_SYMBOL
|| !expr
->symbol
)
205 * It's almost impossible for Smatch to handle __builtin_constant_p()
206 * the same way that GCC does so Smatch ends up making some functions
207 * as no return functions incorrectly.
210 if (option_project
== PROJ_KERNEL
&& expr
->symbol
->ident
&&
211 strstr(expr
->symbol
->ident
->name
, "__compiletime_assert"))
214 if (expr
->symbol
->ctype
.modifiers
& MOD_NORETURN
)
219 static int save_func_time(void *_rl
, int argc
, char **argv
, char **azColName
)
221 unsigned long *rl
= _rl
;
223 *rl
= strtoul(argv
[0], NULL
, 10);
227 static int get_func_time(struct symbol
*sym
)
229 unsigned long time
= 0;
231 run_sql(&save_func_time
, &time
,
232 "select key from return_implies where %s and type = %d;",
233 get_static_filter(sym
), FUNC_TIME
);
238 static int inline_budget
= 20;
240 int inlinable(struct expression
*expr
)
243 struct statement
*last_stmt
= NULL
;
245 if (__inline_fn
) /* don't nest */
248 if (expr
->type
!= EXPR_SYMBOL
|| !expr
->symbol
)
250 if (is_no_inline_function(expr
->symbol
->ident
->name
))
252 sym
= get_base_type(expr
->symbol
);
253 if (sym
->stmt
&& sym
->stmt
->type
== STMT_COMPOUND
) {
254 if (ptr_list_size((struct ptr_list
*)sym
->stmt
->stmts
) > 10)
256 if (sym
->stmt
->type
!= STMT_COMPOUND
)
258 last_stmt
= last_ptr_list((struct ptr_list
*)sym
->stmt
->stmts
);
260 if (sym
->inline_stmt
&& sym
->inline_stmt
->type
== STMT_COMPOUND
) {
261 if (ptr_list_size((struct ptr_list
*)sym
->inline_stmt
->stmts
) > 10)
263 if (sym
->inline_stmt
->type
!= STMT_COMPOUND
)
265 last_stmt
= last_ptr_list((struct ptr_list
*)sym
->inline_stmt
->stmts
);
271 /* the magic numbers in this function are pulled out of my bum. */
272 if (last_stmt
->pos
.line
> sym
->pos
.line
+ inline_budget
)
275 if (get_func_time(expr
->symbol
) >= 2)
281 void __process_post_op_stack(void)
283 struct expression
*expr
;
285 FOR_EACH_PTR(post_op_stack
, expr
) {
286 __pass_to_client(expr
, OP_HOOK
);
287 } END_FOR_EACH_PTR(expr
);
289 __free_ptr_list((struct ptr_list
**)&post_op_stack
);
292 static int handle_comma_assigns(struct expression
*expr
)
294 struct expression
*right
;
295 struct expression
*assign
;
297 right
= strip_expr(expr
->right
);
298 if (right
->type
!= EXPR_COMMA
)
301 __split_expr(right
->left
);
302 __process_post_op_stack();
304 assign
= assign_expression(expr
->left
, '=', right
->right
);
305 __split_expr(assign
);
310 /* This is to handle *p++ = foo; assignments */
311 static int handle_postop_assigns(struct expression
*expr
)
313 struct expression
*left
, *fake_left
;
314 struct expression
*assign
;
316 left
= strip_expr(expr
->left
);
317 if (left
->type
!= EXPR_PREOP
|| left
->op
!= '*')
319 left
= strip_expr(left
->unop
);
320 if (left
->type
!= EXPR_POSTOP
)
323 fake_left
= deref_expression(strip_expr(left
->unop
));
324 assign
= assign_expression(fake_left
, '=', expr
->right
);
326 __split_expr(assign
);
327 __split_expr(expr
->left
);
332 static int prev_expression_is_getting_address(struct expression
*expr
)
334 struct expression
*parent
;
337 parent
= expr_get_parent_expr(expr
);
341 if (parent
->type
== EXPR_PREOP
&& parent
->op
== '&')
343 if (parent
->type
== EXPR_PREOP
&& parent
->op
== '(')
345 if (parent
->type
== EXPR_DEREF
&& parent
->op
== '.')
347 /* Handle &foo->array[offset] */
348 if (parent
->type
== EXPR_BINOP
&& parent
->op
== '+') {
349 parent
= expr_get_parent_expr(parent
);
352 if (parent
->type
== EXPR_PREOP
&& parent
->op
== '*')
362 static void handle_builtin_overflow_func(struct expression
*expr
)
364 struct expression
*a
, *b
, *res
, *assign
;
367 if (sym_name_is("__builtin_add_overflow", expr
->fn
))
369 else if (sym_name_is("__builtin_sub_overflow", expr
->fn
))
371 else if (sym_name_is("__builtin_mul_overflow", expr
->fn
))
376 a
= get_argument_from_call_expr(expr
->args
, 0);
377 b
= get_argument_from_call_expr(expr
->args
, 1);
378 res
= get_argument_from_call_expr(expr
->args
, 2);
380 assign
= assign_expression(deref_expression(res
), '=', binop_expression(a
, op
, b
));
381 __split_expr(assign
);
384 static int handle__builtin_choose_expr(struct expression
*expr
)
386 struct expression
*const_expr
, *expr1
, *expr2
;
389 if (!sym_name_is("__builtin_choose_expr", expr
->fn
))
392 const_expr
= get_argument_from_call_expr(expr
->args
, 0);
393 expr1
= get_argument_from_call_expr(expr
->args
, 1);
394 expr2
= get_argument_from_call_expr(expr
->args
, 2);
396 if (!get_value(const_expr
, &sval
) || !expr1
|| !expr2
)
405 static int handle__builtin_choose_expr_assigns(struct expression
*expr
)
407 struct expression
*const_expr
, *right
, *expr1
, *expr2
, *fake
;
410 right
= strip_parens(expr
->right
);
411 if (right
->type
!= EXPR_CALL
)
413 if (!sym_name_is("__builtin_choose_expr", right
->fn
))
416 const_expr
= get_argument_from_call_expr(right
->args
, 0);
417 expr1
= get_argument_from_call_expr(right
->args
, 1);
418 expr2
= get_argument_from_call_expr(right
->args
, 2);
420 if (!get_value(const_expr
, &sval
) || !expr1
|| !expr2
)
423 fake
= assign_expression(expr
->left
, '=', sval
.value
? expr1
: expr2
);
428 int is_condition_call(struct expression
*expr
)
430 struct expression
*tmp
;
432 FOR_EACH_PTR_REVERSE(big_condition_stack
, tmp
) {
433 if (expr
== tmp
|| expr_get_parent_expr(expr
) == tmp
)
435 if (tmp
->pos
.line
< expr
->pos
.line
)
437 } END_FOR_EACH_PTR_REVERSE(tmp
);
442 static bool gen_fake_function_assign(struct expression
*expr
)
444 static struct expression
*parsed
;
445 struct expression
*assign
, *parent
;
449 /* The rule is that every non-void function call has to be part of an
450 * assignment. TODO: Should we create a fake non-casted assignment
451 * for casted assignments? Also faked assigns for += assignments?
453 type
= get_type(expr
);
454 if (!type
|| type
== &void_ctype
)
457 parent
= expr_get_parent_expr(expr
);
458 if (parent
&& parent
->type
== EXPR_ASSIGNMENT
)
461 parent
= expr_get_fake_parent_expr(expr
);
463 struct expression
*left
= parent
->left
;
465 if (parent
== parsed
)
467 if (!left
|| left
->type
!= EXPR_SYMBOL
)
469 if (strncmp(left
->symbol_name
->name
, "__fake_assign_", 14) != 0)
472 __split_expr(parent
);
476 // TODO: faked_assign skipping conditions is a hack
477 if (is_condition_call(expr
))
480 snprintf(buf
, sizeof(buf
), "__fake_assign_%p", expr
);
481 assign
= create_fake_assign(buf
, get_type(expr
), expr
);
484 __split_expr(assign
);
488 static void split_call(struct expression
*expr
)
490 if (gen_fake_function_assign(expr
))
493 expr_set_parent_expr(expr
->fn
, expr
);
495 if (sym_name_is("__builtin_constant_p", expr
->fn
))
497 if (handle__builtin_choose_expr(expr
))
499 __split_expr(expr
->fn
);
501 if (is_inline_func(expr
->fn
))
502 add_inline_function(expr
->fn
->symbol
->definition
);
503 if (inlinable(expr
->fn
))
505 __process_post_op_stack();
506 __pass_to_client(expr
, FUNCTION_CALL_HOOK_BEFORE
);
507 __pass_to_client(expr
, FUNCTION_CALL_HOOK
);
509 if (inlinable(expr
->fn
))
511 __pass_to_client(expr
, CALL_HOOK_AFTER_INLINE
);
512 if (is_noreturn_func(expr
->fn
))
514 if (!expr_get_parent_expr(expr
))
515 __discard_fake_states(expr
);
516 handle_builtin_overflow_func(expr
);
519 void __split_expr(struct expression
*expr
)
525 // sm_msg("Debug expr_type %d %s expr = '%s'", expr->type, show_special(expr->op), expr_to_str(expr));
527 if (__in_fake_assign
&& expr
->type
!= EXPR_ASSIGNMENT
)
529 if (__in_fake_assign
>= 4) /* don't allow too much nesting */
532 push_expression(&big_expression_stack
, expr
);
533 set_position(expr
->pos
);
534 __pass_to_client(expr
, EXPR_HOOK
);
536 switch (expr
->type
) {
538 expr_set_parent_expr(expr
->unop
, expr
);
540 if (expr
->op
== '*' &&
541 !prev_expression_is_getting_address(expr
))
542 __pass_to_client(expr
, DEREF_HOOK
);
543 __split_expr(expr
->unop
);
544 __pass_to_client(expr
, OP_HOOK
);
547 expr_set_parent_expr(expr
->unop
, expr
);
549 __split_expr(expr
->unop
);
550 push_expression(&post_op_stack
, expr
);
554 if (expr
->statement
&& !expr
->statement
) {
555 stmt_set_parent_stmt(expr
->statement
,
556 last_ptr_list((struct ptr_list
*)big_statement_stack
));
558 __split_stmt(expr
->statement
);
563 expr_set_parent_expr(expr
->left
, expr
);
564 expr_set_parent_expr(expr
->right
, expr
);
566 __pass_to_client(expr
, LOGIC_HOOK
);
567 __handle_logic(expr
);
570 expr_set_parent_expr(expr
->left
, expr
);
571 expr_set_parent_expr(expr
->right
, expr
);
573 __pass_to_client(expr
, BINOP_HOOK
);
574 __split_expr(expr
->left
);
575 __split_expr(expr
->right
);
578 expr_set_parent_expr(expr
->left
, expr
);
579 expr_set_parent_expr(expr
->right
, expr
);
581 __split_expr(expr
->left
);
582 __process_post_op_stack();
583 __split_expr(expr
->right
);
585 case EXPR_ASSIGNMENT
: {
586 struct expression
*right
;
588 expr_set_parent_expr(expr
->left
, expr
);
589 expr_set_parent_expr(expr
->right
, expr
);
591 right
= strip_expr(expr
->right
);
595 __pass_to_client(expr
, RAW_ASSIGNMENT_HOOK
);
598 if (__handle_condition_assigns(expr
))
600 /* foo = (x < 5 ? foo : 5); */
601 if (__handle_select_assigns(expr
))
603 /* foo = ({frob(); frob(); frob(); 1;}) */
604 if (__handle_expr_statement_assigns(expr
))
605 break; // FIXME: got after
607 if (handle_comma_assigns(expr
))
609 if (handle__builtin_choose_expr_assigns(expr
))
611 if (handle_postop_assigns(expr
))
612 break; /* no need to goto after_assign */
614 __split_expr(expr
->right
);
615 if (outside_of_function())
616 __pass_to_client(expr
, GLOBAL_ASSIGNMENT_HOOK
);
618 __pass_to_client(expr
, ASSIGNMENT_HOOK
);
620 __fake_struct_member_assignments(expr
);
622 /* Re-examine ->right for inlines. See the commit message */
623 right
= strip_expr(expr
->right
);
624 if (expr
->op
== '=' && right
->type
== EXPR_CALL
)
625 __pass_to_client(expr
, CALL_ASSIGNMENT_HOOK
);
628 if (get_macro_name(right
->pos
) &&
629 get_macro_name(expr
->pos
) != get_macro_name(right
->pos
))
630 __pass_to_client(expr
, MACRO_ASSIGNMENT_HOOK
);
632 __pass_to_client(expr
, ASSIGNMENT_HOOK_AFTER
);
633 __split_expr(expr
->left
);
637 expr_set_parent_expr(expr
->deref
, expr
);
639 __pass_to_client(expr
, DEREF_HOOK
);
640 __split_expr(expr
->deref
);
643 expr_set_parent_expr(expr
->base
, expr
);
645 __split_expr(expr
->base
);
648 case EXPR_FORCE_CAST
:
649 expr_set_parent_expr(expr
->cast_expression
, expr
);
651 __pass_to_client(expr
, CAST_HOOK
);
652 __split_expr(expr
->cast_expression
);
655 if (expr
->cast_expression
)
656 __pass_to_client(strip_parens(expr
->cast_expression
),
662 case EXPR_CONDITIONAL
:
664 expr_set_parent_expr(expr
->conditional
, expr
);
665 expr_set_parent_expr(expr
->cond_true
, expr
);
666 expr_set_parent_expr(expr
->cond_false
, expr
);
668 if (known_condition_true(expr
->conditional
)) {
669 __split_expr(expr
->cond_true
);
672 if (known_condition_false(expr
->conditional
)) {
673 __split_expr(expr
->cond_false
);
676 __pass_to_client(expr
, SELECT_HOOK
);
677 __split_whole_condition(expr
->conditional
);
678 __split_expr(expr
->cond_true
);
679 __push_true_states();
680 __use_false_states();
681 __split_expr(expr
->cond_false
);
682 __merge_true_states();
687 case EXPR_INITIALIZER
:
688 split_expr_list(expr
->expr_list
, expr
);
690 case EXPR_IDENTIFIER
:
691 expr_set_parent_expr(expr
->ident_expression
, expr
);
692 __split_expr(expr
->ident_expression
);
695 expr_set_parent_expr(expr
->idx_expression
, expr
);
696 __split_expr(expr
->idx_expression
);
699 expr_set_parent_expr(expr
->init_expr
, expr
);
700 __split_expr(expr
->init_expr
);
703 __pass_to_client(expr
, SYM_HOOK
);
706 __pass_to_client(expr
, STRING_HOOK
);
711 __pass_to_client(expr
, EXPR_HOOK_AFTER
);
712 pop_expression(&big_expression_stack
);
715 static int is_forever_loop(struct statement
*stmt
)
717 struct expression
*expr
;
720 expr
= strip_expr(stmt
->iterator_pre_condition
);
722 expr
= stmt
->iterator_post_condition
;
724 /* this is a for(;;) loop... */
728 if (get_value(expr
, &sval
) && sval
.value
!= 0)
735 static char *get_loop_name(int num
)
739 snprintf(buf
, 255, "-loop%d", num
);
741 return alloc_sname(buf
);
745 * Pre Loops are while and for loops.
747 static void handle_pre_loop(struct statement
*stmt
)
749 int once_through
; /* we go through the loop at least once */
750 struct sm_state
*extra_sm
= NULL
;
753 struct stree
*stree
= NULL
;
754 struct sm_state
*sm
= NULL
;
756 loop_name
= get_loop_name(loop_num
);
759 if (stmt
->iterator_pre_statement
) {
760 __split_stmt(stmt
->iterator_pre_statement
);
761 __prev_stmt
= stmt
->iterator_pre_statement
;
764 once_through
= implied_condition_true(stmt
->iterator_pre_condition
);
770 __merge_gotos(loop_name
, NULL
);
772 extra_sm
= __extra_handle_canonical_loops(stmt
, &stree
);
773 __in_pre_condition
++;
774 __pass_to_client(stmt
, PRELOOP_HOOK
);
775 __split_whole_condition(stmt
->iterator_pre_condition
);
776 __in_pre_condition
--;
777 FOR_EACH_SM(stree
, sm
) {
778 set_state(sm
->owner
, sm
->name
, sm
->sym
, sm
->state
);
779 } END_FOR_EACH_SM(sm
);
782 extra_sm
= get_sm_state(extra_sm
->owner
, extra_sm
->name
, extra_sm
->sym
);
784 if (option_assume_loops
)
787 __split_stmt(stmt
->iterator_statement
);
788 if (is_forever_loop(stmt
)) {
790 __save_gotos(loop_name
, NULL
);
792 __push_fake_cur_stree();
793 __split_stmt(stmt
->iterator_post_statement
);
794 stree
= __pop_fake_cur_stree();
796 __discard_false_states();
797 __pass_to_client(stmt
, AFTER_LOOP_NO_BREAKS
);
800 if (!__path_is_null())
801 __merge_stree_into_cur(stree
);
805 unchanged
= __iterator_unchanged(extra_sm
);
806 __split_stmt(stmt
->iterator_post_statement
);
807 __prev_stmt
= stmt
->iterator_post_statement
;
810 __save_gotos(loop_name
, NULL
);
811 __in_pre_condition
++;
812 __split_whole_condition(stmt
->iterator_pre_condition
);
813 __in_pre_condition
--;
815 __merge_false_states();
817 __discard_false_states();
819 __merge_false_states();
821 if (extra_sm
&& unchanged
)
822 __extra_pre_loop_hook_after(extra_sm
,
823 stmt
->iterator_post_statement
,
824 stmt
->iterator_pre_condition
);
825 __pass_to_client(stmt
, AFTER_LOOP_NO_BREAKS
);
832 * Post loops are do {} while();
834 static void handle_post_loop(struct statement
*stmt
)
838 loop_name
= get_loop_name(loop_num
);
842 __pass_to_client(stmt
, POSTLOOP_HOOK
);
846 __merge_gotos(loop_name
, NULL
);
847 __split_stmt(stmt
->iterator_statement
);
849 if (!expr_is_zero(stmt
->iterator_post_condition
))
850 __save_gotos(loop_name
, NULL
);
852 if (is_forever_loop(stmt
)) {
853 __pass_to_client(stmt
, AFTER_LOOP_NO_BREAKS
);
856 __split_whole_condition(stmt
->iterator_post_condition
);
857 __use_false_states();
858 __pass_to_client(stmt
, AFTER_LOOP_NO_BREAKS
);
864 static int empty_statement(struct statement
*stmt
)
868 if (stmt
->type
== STMT_EXPRESSION
&& !stmt
->expression
)
873 static int last_stmt_on_same_line(void)
875 struct statement
*stmt
;
878 FOR_EACH_PTR_REVERSE(big_statement_stack
, stmt
) {
881 if (stmt
->pos
.line
== get_lineno())
884 } END_FOR_EACH_PTR_REVERSE(stmt
);
888 static void split_asm_ops(struct asm_operand_list
*ops
)
890 struct asm_operand
*op
;
892 FOR_EACH_PTR(ops
, op
) {
893 __split_expr(op
->expr
);
894 } END_FOR_EACH_PTR(op
);
897 static int is_case_val(struct statement
*stmt
, sval_t sval
)
901 if (stmt
->type
!= STMT_CASE
)
903 if (!stmt
->case_expression
) {
907 if (!get_value(stmt
->case_expression
, &case_sval
))
909 if (case_sval
.value
== sval
.value
)
914 static struct range_list
*get_case_rl(struct expression
*switch_expr
,
915 struct expression
*case_expr
,
916 struct expression
*case_to
)
919 struct range_list
*rl
= NULL
;
920 struct symbol
*switch_type
;
922 switch_type
= get_type(switch_expr
);
923 if (get_value(case_to
, &end
) && get_value(case_expr
, &start
)) {
924 start
= sval_cast(switch_type
, start
);
925 end
= sval_cast(switch_type
, end
);
926 add_range(&rl
, start
, end
);
927 } else if (get_value(case_expr
, &start
)) {
928 start
= sval_cast(switch_type
, start
);
929 add_range(&rl
, start
, start
);
935 static void split_known_switch(struct statement
*stmt
, sval_t sval
)
937 struct statement
*tmp
;
938 struct range_list
*rl
;
940 __split_expr(stmt
->switch_expression
);
941 sval
= sval_cast(get_type(stmt
->switch_expression
), sval
);
943 push_expression(&switch_expr_stack
, stmt
->switch_expression
);
944 __save_switch_states(top_expression(switch_expr_stack
));
949 stmt
= stmt
->switch_statement
;
951 __push_scope_hooks();
952 FOR_EACH_PTR(stmt
->stmts
, tmp
) {
953 __smatch_lineno
= tmp
->pos
.line
;
954 if (is_case_val(tmp
, sval
)) {
955 rl
= alloc_rl(sval
, sval
);
956 __merge_switches(top_expression(switch_expr_stack
), rl
);
957 __pass_case_to_client(top_expression(switch_expr_stack
), rl
);
959 if (__path_is_null())
962 if (__path_is_null()) {
966 } END_FOR_EACH_PTR(tmp
);
968 __call_scope_hooks();
969 if (!__pop_default())
970 __merge_switches(top_expression(switch_expr_stack
), NULL
);
971 __discard_switches();
973 pop_expression(&switch_expr_stack
);
976 static void split_case(struct statement
*stmt
)
978 struct range_list
*rl
= NULL
;
980 expr_set_parent_stmt(stmt
->case_expression
, stmt
);
981 expr_set_parent_stmt(stmt
->case_to
, stmt
);
983 rl
= get_case_rl(top_expression(switch_expr_stack
),
984 stmt
->case_expression
, stmt
->case_to
);
985 while (stmt
->case_statement
->type
== STMT_CASE
) {
986 struct range_list
*tmp
;
988 tmp
= get_case_rl(top_expression(switch_expr_stack
),
989 stmt
->case_statement
->case_expression
,
990 stmt
->case_statement
->case_to
);
993 rl
= rl_union(rl
, tmp
);
994 if (!stmt
->case_expression
)
996 stmt
= stmt
->case_statement
;
999 __merge_switches(top_expression(switch_expr_stack
), rl
);
1001 if (!stmt
->case_expression
)
1004 stmt_set_parent_stmt(stmt
->case_statement
, stmt
);
1005 __split_stmt(stmt
->case_statement
);
1008 int time_parsing_function(void)
1010 return ms_since(&fn_start_time
) / 1000;
1013 bool taking_too_long(void)
1015 if ((ms_since(&outer_fn_start_time
) / 1000) > 60 * 5) /* five minutes */
1020 struct statement
*get_last_stmt(void)
1023 struct statement
*stmt
;
1025 fn
= get_base_type(cur_func_sym
);
1030 stmt
= fn
->inline_stmt
;
1031 if (!stmt
|| stmt
->type
!= STMT_COMPOUND
)
1033 stmt
= last_ptr_list((struct ptr_list
*)stmt
->stmts
);
1034 if (stmt
&& stmt
->type
== STMT_LABEL
)
1035 stmt
= stmt
->label_statement
;
1039 int is_last_stmt(struct statement
*cur_stmt
)
1041 struct statement
*last
;
1043 last
= get_last_stmt();
1044 if (last
&& last
== cur_stmt
)
1049 static void handle_backward_goto(struct statement
*goto_stmt
)
1051 const char *goto_name
, *label_name
;
1052 struct statement
*func_stmt
;
1053 struct symbol
*base_type
= get_base_type(cur_func_sym
);
1054 struct statement
*tmp
;
1059 if (last_goto_statement_handled
)
1061 last_goto_statement_handled
= 1;
1063 if (!goto_stmt
->goto_label
||
1064 goto_stmt
->goto_label
->type
!= SYM_LABEL
||
1065 !goto_stmt
->goto_label
->ident
)
1067 goto_name
= goto_stmt
->goto_label
->ident
->name
;
1069 func_stmt
= base_type
->stmt
;
1071 func_stmt
= base_type
->inline_stmt
;
1074 if (func_stmt
->type
!= STMT_COMPOUND
)
1077 FOR_EACH_PTR(func_stmt
->stmts
, tmp
) {
1079 if (tmp
->type
!= STMT_LABEL
)
1081 if (!tmp
->label_identifier
||
1082 tmp
->label_identifier
->type
!= SYM_LABEL
||
1083 !tmp
->label_identifier
->ident
)
1085 label_name
= tmp
->label_identifier
->ident
->name
;
1086 if (strcmp(goto_name
, label_name
) != 0)
1091 } END_FOR_EACH_PTR(tmp
);
1094 static void fake_a_return(void)
1096 struct expression
*ret
= NULL
;
1101 if (cur_func_return_type() != &void_ctype
)
1102 ret
= unknown_value_expression(NULL
);
1104 __pass_to_client(ret
, RETURN_HOOK
);
1108 static void split_ret_value(struct expression
*expr
)
1110 struct symbol
*type
;
1115 type
= get_real_base_type(cur_func_sym
);
1116 type
= get_real_base_type(type
);
1117 expr
= fake_a_variable_assign(type
, NULL
, expr
, -1);
1119 __in_fake_var_assign
++;
1121 __in_fake_var_assign
--;
1124 static void fake_an_empty_default(struct position pos
)
1126 static struct statement none
= {};
1129 none
.type
= STMT_NONE
;
1130 __merge_switches(top_expression(switch_expr_stack
), NULL
);
1131 __split_stmt(&none
);
1134 static void split_compound(struct statement
*stmt
)
1136 struct statement
*prev
= NULL
;
1137 struct statement
*cur
= NULL
;
1138 struct statement
*next
;
1140 __push_scope_hooks();
1142 FOR_EACH_PTR(stmt
->stmts
, next
) {
1143 /* just set them all ahead of time */
1144 stmt_set_parent_stmt(next
, stmt
);
1154 } END_FOR_EACH_PTR(next
);
1163 * For function scope, then delay calling the scope hooks until the
1164 * end of function hooks can run. I'm not positive this is the right
1167 if (!is_last_stmt(cur
))
1168 __call_scope_hooks();
1172 * This is a hack, work around for detecting empty functions.
1174 static int need_delayed_scope_hooks(void)
1176 struct symbol
*fn
= get_base_type(cur_func_sym
);
1177 struct statement
*stmt
;
1183 stmt
= fn
->inline_stmt
;
1184 if (stmt
&& stmt
->type
== STMT_COMPOUND
)
1189 void __split_label_stmt(struct statement
*stmt
)
1191 if (stmt
->label_identifier
&&
1192 stmt
->label_identifier
->type
== SYM_LABEL
&&
1193 stmt
->label_identifier
->ident
) {
1194 loop_count
|= 0x0800000;
1195 __merge_gotos(stmt
->label_identifier
->ident
->name
, stmt
->label_identifier
);
1199 static void find_asm_gotos(struct statement
*stmt
)
1203 FOR_EACH_PTR(stmt
->asm_labels
, sym
) {
1204 __save_gotos(sym
->ident
->name
, sym
);
1205 } END_FOR_EACH_PTR(sym
);
1208 void __split_stmt(struct statement
*stmt
)
1210 static int indent_cnt
;
1212 struct timeval start
, stop
;
1214 gettimeofday(&start
, NULL
);
1219 if (!__in_fake_assign
)
1220 __silence_warnings_for_stmt
= false;
1222 if (__bail_on_rest_of_function
|| is_skipped_function())
1225 if (out_of_memory() || taking_too_long()) {
1226 gettimeofday(&start
, NULL
);
1228 __bail_on_rest_of_function
= 1;
1230 sm_perror("Function too hairy. Giving up. %lu seconds",
1231 start
.tv_sec
- fn_start_time
.tv_sec
);
1233 final_pass
= 0; /* turn off sm_msg() from here */
1239 add_ptr_list(&big_statement_stack
, stmt
);
1240 free_expression_stack(&big_expression_stack
);
1241 set_position(stmt
->pos
);
1242 __pass_to_client(stmt
, STMT_HOOK
);
1244 switch (stmt
->type
) {
1245 case STMT_DECLARATION
:
1246 split_declaration(stmt
->declaration
);
1249 expr_set_parent_stmt(stmt
->ret_value
, stmt
);
1251 split_ret_value(stmt
->ret_value
);
1252 __pass_to_client(stmt
->ret_value
, RETURN_HOOK
);
1253 __process_post_op_stack();
1256 case STMT_EXPRESSION
:
1257 expr_set_parent_stmt(stmt
->expression
, stmt
);
1258 expr_set_parent_stmt(stmt
->context
, stmt
);
1260 __split_expr(stmt
->expression
);
1263 split_compound(stmt
);
1266 stmt_set_parent_stmt(stmt
->if_true
, stmt
);
1267 stmt_set_parent_stmt(stmt
->if_false
, stmt
);
1268 expr_set_parent_stmt(stmt
->if_conditional
, stmt
);
1270 if (known_condition_true(stmt
->if_conditional
)) {
1271 __split_stmt(stmt
->if_true
);
1274 if (known_condition_false(stmt
->if_conditional
)) {
1275 __split_stmt(stmt
->if_false
);
1278 __split_whole_condition(stmt
->if_conditional
);
1279 __split_stmt(stmt
->if_true
);
1280 if (empty_statement(stmt
->if_true
) &&
1281 last_stmt_on_same_line() &&
1282 !get_macro_name(stmt
->if_true
->pos
))
1283 sm_warning("if();");
1284 __push_true_states();
1285 __use_false_states();
1286 __split_stmt(stmt
->if_false
);
1287 __merge_true_states();
1290 stmt_set_parent_stmt(stmt
->iterator_pre_statement
, stmt
);
1291 stmt_set_parent_stmt(stmt
->iterator_statement
, stmt
);
1292 stmt_set_parent_stmt(stmt
->iterator_post_statement
, stmt
);
1293 expr_set_parent_stmt(stmt
->iterator_pre_condition
, stmt
);
1294 expr_set_parent_stmt(stmt
->iterator_post_condition
, stmt
);
1296 if (stmt
->iterator_pre_condition
)
1297 handle_pre_loop(stmt
);
1298 else if (stmt
->iterator_post_condition
)
1299 handle_post_loop(stmt
);
1301 // these are for(;;) type loops.
1302 handle_pre_loop(stmt
);
1306 stmt_set_parent_stmt(stmt
->switch_statement
, stmt
);
1307 expr_set_parent_stmt(stmt
->switch_expression
, stmt
);
1309 if (get_value(stmt
->switch_expression
, &sval
)) {
1310 split_known_switch(stmt
, sval
);
1313 __split_expr(stmt
->switch_expression
);
1314 push_expression(&switch_expr_stack
, stmt
->switch_expression
);
1315 __save_switch_states(top_expression(switch_expr_stack
));
1319 __split_stmt(stmt
->switch_statement
);
1320 if (!__pop_default() && have_remaining_cases())
1321 fake_an_empty_default(stmt
->pos
);
1322 __discard_switches();
1324 pop_expression(&switch_expr_stack
);
1330 __split_label_stmt(stmt
);
1331 __split_stmt(stmt
->label_statement
);
1334 expr_set_parent_stmt(stmt
->goto_expression
, stmt
);
1336 __split_expr(stmt
->goto_expression
);
1337 if (stmt
->goto_label
&& stmt
->goto_label
->type
== SYM_NODE
) {
1338 if (!strcmp(stmt
->goto_label
->ident
->name
, "break")) {
1340 } else if (!strcmp(stmt
->goto_label
->ident
->name
,
1342 __process_continues();
1344 } else if (stmt
->goto_label
&&
1345 stmt
->goto_label
->type
== SYM_LABEL
&&
1346 stmt
->goto_label
->ident
) {
1347 __save_gotos(stmt
->goto_label
->ident
->name
, stmt
->goto_label
);
1350 if (is_last_stmt(stmt
))
1351 handle_backward_goto(stmt
);
1356 expr_set_parent_stmt(stmt
->asm_string
, stmt
);
1358 find_asm_gotos(stmt
);
1359 __pass_to_client(stmt
, ASM_HOOK
);
1360 __split_expr(stmt
->asm_string
);
1361 split_asm_ops(stmt
->asm_outputs
);
1362 split_asm_ops(stmt
->asm_inputs
);
1363 split_expr_list(stmt
->asm_clobbers
, NULL
);
1368 __split_expr(stmt
->range_expression
);
1369 __split_expr(stmt
->range_low
);
1370 __split_expr(stmt
->range_high
);
1373 __pass_to_client(stmt
, STMT_HOOK_AFTER
);
1374 if (--indent_cnt
== 1)
1375 __discard_fake_states(NULL
);
1378 __process_post_op_stack();
1380 gettimeofday(&stop
, NULL
);
1381 if (option_time_stmt
&& stmt
)
1382 sm_msg("stmt_time%s: %ld",
1383 stmt
->type
== STMT_COMPOUND
? "_block" : "",
1384 stop
.tv_sec
- start
.tv_sec
);
1387 static void split_expr_list(struct expression_list
*expr_list
, struct expression
*parent
)
1389 struct expression
*expr
;
1391 FOR_EACH_PTR(expr_list
, expr
) {
1392 expr_set_parent_expr(expr
, parent
);
1394 __process_post_op_stack();
1395 } END_FOR_EACH_PTR(expr
);
1398 static bool cast_arg(struct symbol
*type
, struct expression
*arg
)
1400 struct symbol
*orig
;
1405 arg
= strip_parens(arg
);
1406 if (arg
!= strip_expr(arg
))
1409 orig
= get_type(arg
);
1412 if (types_equiv(orig
, type
))
1415 if (orig
->type
== SYM_ARRAY
&& type
->type
== SYM_PTR
)
1419 * I would have expected that we could just do use (orig == type) but I
1420 * guess for pointers we need to get the basetype to do that comparison.
1424 if (orig
->type
!= SYM_PTR
||
1425 type
->type
!= SYM_PTR
) {
1426 if (type_fits(type
, orig
))
1430 orig
= get_real_base_type(orig
);
1431 type
= get_real_base_type(type
);
1438 static struct expression
*fake_a_variable_assign(struct symbol
*type
, struct expression
*call
, struct expression
*expr
, int nr
)
1443 if (!expr
|| !cur_func_sym
)
1446 if (expr
->type
== EXPR_ASSIGNMENT
)
1449 /* for va_args then we don't know the type */
1451 type
= get_type(expr
);
1453 cast
= cast_arg(type
, expr
);
1455 * Using expr_to_sym() here is a hack. We want to say that we don't
1456 * need to assign frob(foo) or frob(foo->bar) if the types are right.
1457 * It turns out faking these assignments is way more expensive than I
1458 * would have imagined. I'm not sure why exactly.
1463 * if the code is "return *p;" where "p" is a user pointer then
1464 * we want to create a fake assignment so that it sets the state
1465 * in check_kernel_user_data.c.
1468 if (expr
->type
!= EXPR_PREOP
&&
1469 expr
->op
!= '*' && expr
->op
!= '&' &&
1475 snprintf(buf
, sizeof(buf
), "__fake_return_%p", expr
);
1477 snprintf(buf
, sizeof(buf
), "__fake_param_%p_%d", call
, nr
);
1478 return create_fake_assign(buf
, type
, expr
);
1481 static void split_args(struct expression
*expr
)
1483 struct expression
*arg
, *tmp
;
1484 struct symbol
*type
;
1488 FOR_EACH_PTR(expr
->args
, arg
) {
1490 expr_set_parent_expr(arg
, expr
);
1491 type
= get_arg_type(expr
->fn
, i
);
1492 tmp
= fake_a_variable_assign(type
, expr
, arg
, i
);
1494 __in_fake_var_assign
++;
1497 __in_fake_var_assign
--;
1498 __process_post_op_stack();
1499 } END_FOR_EACH_PTR(arg
);
1502 static void split_sym(struct symbol
*sym
)
1506 if (!(sym
->namespace & NS_SYMBOL
))
1509 __split_stmt(sym
->stmt
);
1510 __split_expr(sym
->array_size
);
1511 split_symlist(sym
->arguments
);
1512 split_symlist(sym
->symbol_list
);
1513 __split_stmt(sym
->inline_stmt
);
1514 split_symlist(sym
->inline_symbol_list
);
1517 static void split_symlist(struct symbol_list
*sym_list
)
1521 FOR_EACH_PTR(sym_list
, sym
) {
1523 } END_FOR_EACH_PTR(sym
);
1526 typedef void (fake_cb
)(struct expression
*expr
);
1528 static int member_to_number(struct expression
*expr
, struct ident
*member
)
1530 struct symbol
*type
, *tmp
;
1536 name
= member
->name
;
1538 type
= get_type(expr
);
1539 if (!type
|| type
->type
!= SYM_STRUCT
)
1543 FOR_EACH_PTR(type
->symbol_list
, tmp
) {
1547 if (strcmp(name
, tmp
->ident
->name
) == 0)
1549 } END_FOR_EACH_PTR(tmp
);
1553 static struct ident
*number_to_member(struct expression
*expr
, int num
)
1555 struct symbol
*type
, *member
;
1558 type
= get_type(expr
);
1559 if (!type
|| type
->type
!= SYM_STRUCT
)
1562 FOR_EACH_PTR(type
->symbol_list
, member
) {
1564 return member
->ident
;
1566 } END_FOR_EACH_PTR(member
);
1570 static void fake_element_assigns_helper(struct expression
*array
, struct expression_list
*expr_list
, fake_cb
*fake_cb
);
1572 static void set_inner_struct_members(struct expression
*expr
, struct symbol
*member
)
1574 struct expression
*edge_member
, *assign
;
1575 struct symbol
*base
= get_real_base_type(member
);
1579 expr
= member_expression(expr
, '.', member
->ident
);
1581 FOR_EACH_PTR(base
->symbol_list
, tmp
) {
1582 struct symbol
*type
;
1584 type
= get_real_base_type(tmp
);
1588 edge_member
= member_expression(expr
, '.', tmp
->ident
);
1589 if (get_extra_state(edge_member
))
1592 if (type
->type
== SYM_UNION
|| type
->type
== SYM_STRUCT
) {
1593 set_inner_struct_members(expr
, tmp
);
1600 assign
= assign_expression(edge_member
, '=', zero_expr());
1601 __split_expr(assign
);
1602 } END_FOR_EACH_PTR(tmp
);
1607 static void set_unset_to_zero(struct symbol
*type
, struct expression
*expr
)
1610 struct expression
*member
= NULL
;
1611 struct expression
*assign
;
1613 FOR_EACH_PTR(type
->symbol_list
, tmp
) {
1614 type
= get_real_base_type(tmp
);
1619 member
= member_expression(expr
, '.', tmp
->ident
);
1620 if (get_extra_state(member
))
1624 if (type
->type
== SYM_UNION
|| type
->type
== SYM_STRUCT
) {
1625 set_inner_struct_members(expr
, tmp
);
1628 if (type
->type
== SYM_ARRAY
)
1633 assign
= assign_expression(member
, '=', zero_expr());
1634 __split_expr(assign
);
1635 } END_FOR_EACH_PTR(tmp
);
1638 static void fake_member_assigns_helper(struct expression
*symbol
, struct expression_list
*members
, fake_cb
*fake_cb
)
1640 struct expression
*deref
, *assign
, *tmp
, *right
;
1641 struct symbol
*struct_type
, *type
;
1642 struct ident
*member
;
1645 struct_type
= get_type(symbol
);
1647 (struct_type
->type
!= SYM_STRUCT
&& struct_type
->type
!= SYM_UNION
))
1651 * We're parsing an initializer that could look something like this:
1652 * struct foo foo = {
1654 * .whatever.xxx = 11,
1658 * So what we have here is a list with 42, .whatever, and .zzz. We need
1659 * to break it up into left and right sides of the assignments.
1663 FOR_EACH_PTR(members
, tmp
) {
1665 if (tmp
->type
== EXPR_IDENTIFIER
) {
1666 member_idx
= member_to_number(symbol
, tmp
->expr_ident
);
1667 while (tmp
->type
== EXPR_IDENTIFIER
) {
1668 member
= tmp
->expr_ident
;
1669 tmp
= tmp
->ident_expression
;
1671 deref
= member_expression(deref
, '.', member
);
1673 deref
= member_expression(symbol
, '.', member
);
1676 member
= number_to_member(symbol
, member_idx
);
1677 deref
= member_expression(symbol
, '.', member
);
1681 if (right
->type
== EXPR_INITIALIZER
) {
1682 type
= get_type(deref
);
1683 if (type
&& type
->type
== SYM_ARRAY
)
1684 fake_element_assigns_helper(deref
, right
->expr_list
, fake_cb
);
1686 fake_member_assigns_helper(deref
, right
->expr_list
, fake_cb
);
1688 assign
= assign_expression(deref
, '=', right
);
1691 } END_FOR_EACH_PTR(tmp
);
1693 set_unset_to_zero(struct_type
, symbol
);
1696 static void fake_member_assigns(struct symbol
*sym
, fake_cb
*fake_cb
)
1698 fake_member_assigns_helper(symbol_expression(sym
),
1699 sym
->initializer
->expr_list
, fake_cb
);
1702 static void fake_element_assigns_helper(struct expression
*array
, struct expression_list
*expr_list
, fake_cb
*fake_cb
)
1704 struct expression
*offset
, *binop
, *assign
, *tmp
;
1705 struct symbol
*type
;
1708 if (ptr_list_size((struct ptr_list
*)expr_list
) > 1000)
1713 FOR_EACH_PTR(expr_list
, tmp
) {
1714 if (tmp
->type
== EXPR_INDEX
) {
1715 if (tmp
->idx_from
!= tmp
->idx_to
)
1717 idx
= tmp
->idx_from
;
1720 if (!tmp
->idx_expression
)
1722 tmp
= tmp
->idx_expression
;
1724 offset
= value_expr(idx
);
1725 binop
= array_element_expression(array
, offset
);
1726 if (tmp
->type
== EXPR_INITIALIZER
) {
1727 type
= get_type(binop
);
1728 if (type
&& type
->type
== SYM_ARRAY
)
1729 fake_element_assigns_helper(binop
, tmp
->expr_list
, fake_cb
);
1731 fake_member_assigns_helper(binop
, tmp
->expr_list
, fake_cb
);
1733 assign
= assign_expression(binop
, '=', tmp
);
1740 } END_FOR_EACH_PTR(tmp
);
1742 __call_array_initialized_hooks(array
, max
);
1745 static void fake_element_assigns(struct symbol
*sym
, fake_cb
*fake_cb
)
1747 fake_element_assigns_helper(symbol_expression(sym
), sym
->initializer
->expr_list
, fake_cb
);
1750 static void fake_assign_expr(struct symbol
*sym
)
1752 struct expression
*assign
, *symbol
;
1754 symbol
= symbol_expression(sym
);
1755 assign
= assign_expression(symbol
, '=', sym
->initializer
);
1756 __split_expr(assign
);
1759 static void do_initializer_stuff(struct symbol
*sym
)
1761 if (!sym
->initializer
)
1764 if (sym
->initializer
->type
== EXPR_INITIALIZER
) {
1765 if (get_real_base_type(sym
)->type
== SYM_ARRAY
)
1766 fake_element_assigns(sym
, __split_expr
);
1768 fake_member_assigns(sym
, __split_expr
);
1770 fake_assign_expr(sym
);
1774 static void split_declaration(struct symbol_list
*sym_list
)
1778 FOR_EACH_PTR(sym_list
, sym
) {
1779 __pass_to_client(sym
, DECLARATION_HOOK
);
1780 do_initializer_stuff(sym
);
1781 __pass_to_client(sym
, DECLARATION_HOOK_AFTER
);
1783 } END_FOR_EACH_PTR(sym
);
1786 static void call_global_assign_hooks(struct expression
*assign
)
1788 __pass_to_client(assign
, GLOBAL_ASSIGNMENT_HOOK
);
1791 static void fake_global_assign(struct symbol
*sym
)
1793 struct expression
*assign
, *symbol
;
1795 if (get_real_base_type(sym
)->type
== SYM_ARRAY
) {
1796 if (sym
->initializer
&& sym
->initializer
->type
== EXPR_INITIALIZER
) {
1797 fake_element_assigns(sym
, call_global_assign_hooks
);
1798 } else if (sym
->initializer
) {
1799 symbol
= symbol_expression(sym
);
1800 assign
= assign_expression(symbol
, '=', sym
->initializer
);
1801 __pass_to_client(assign
, GLOBAL_ASSIGNMENT_HOOK
);
1803 fake_element_assigns_helper(symbol_expression(sym
), NULL
, call_global_assign_hooks
);
1805 } else if (get_real_base_type(sym
)->type
== SYM_STRUCT
) {
1806 if (sym
->initializer
&& sym
->initializer
->type
== EXPR_INITIALIZER
) {
1807 fake_member_assigns(sym
, call_global_assign_hooks
);
1808 } else if (sym
->initializer
) {
1809 symbol
= symbol_expression(sym
);
1810 assign
= assign_expression(symbol
, '=', sym
->initializer
);
1811 __pass_to_client(assign
, GLOBAL_ASSIGNMENT_HOOK
);
1813 fake_member_assigns_helper(symbol_expression(sym
), NULL
, call_global_assign_hooks
);
1816 symbol
= symbol_expression(sym
);
1817 if (sym
->initializer
) {
1818 assign
= assign_expression(symbol
, '=', sym
->initializer
);
1819 __split_expr(assign
);
1821 assign
= assign_expression(symbol
, '=', zero_expr());
1823 __pass_to_client(assign
, GLOBAL_ASSIGNMENT_HOOK
);
1827 static void start_function_definition(struct symbol
*sym
)
1829 __in_function_def
= 1;
1830 __pass_to_client(sym
, FUNC_DEF_HOOK
);
1831 __in_function_def
= 0;
1832 __pass_to_client(sym
, AFTER_DEF_HOOK
);
1836 void add_function_data(unsigned long *fn_data
)
1838 __add_ptr_list(&fn_data_list
, fn_data
);
1841 static void clear_function_data(void)
1845 FOR_EACH_PTR(fn_data_list
, tmp
) {
1847 } END_FOR_EACH_PTR(tmp
);
1850 static void record_func_time(void)
1852 struct timeval stop
;
1856 gettimeofday(&stop
, NULL
);
1857 func_time
= stop
.tv_sec
- fn_start_time
.tv_sec
;
1858 snprintf(buf
, sizeof(buf
), "%d", func_time
);
1859 sql_insert_return_implies(FUNC_TIME
, 0, "", buf
);
1860 if (option_time
&& func_time
> 2) {
1862 sm_msg("func_time: %d", func_time
);
1867 static void split_function(struct symbol
*sym
)
1869 struct symbol
*base_type
= get_base_type(sym
);
1871 if (!base_type
->stmt
&& !base_type
->inline_stmt
)
1874 gettimeofday(&outer_fn_start_time
, NULL
);
1875 gettimeofday(&fn_start_time
, NULL
);
1878 cur_func
= sym
->ident
->name
;
1879 set_position(sym
->pos
);
1880 clear_function_data();
1882 last_goto_statement_handled
= 0;
1883 sm_debug("new function: %s\n", cur_func
);
1885 if (option_two_passes
) {
1889 start_function_definition(sym
);
1890 __split_stmt(base_type
->stmt
);
1891 __split_stmt(base_type
->inline_stmt
);
1897 start_function_definition(sym
);
1898 __split_stmt(base_type
->stmt
);
1899 __split_stmt(base_type
->inline_stmt
);
1900 if (!__path_is_null() &&
1901 cur_func_return_type() == &void_ctype
&&
1902 !__bail_on_rest_of_function
) {
1903 __pass_to_client(NULL
, RETURN_HOOK
);
1906 __pass_to_client(sym
, END_FUNC_HOOK
);
1907 if (need_delayed_scope_hooks())
1908 __call_scope_hooks();
1909 __pass_to_client(sym
, AFTER_FUNC_HOOK
);
1916 cur_func_sym
= NULL
;
1918 free_data_info_allocs();
1919 free_expression_stack(&switch_expr_stack
);
1920 __free_ptr_list((struct ptr_list
**)&big_statement_stack
);
1921 __bail_on_rest_of_function
= 0;
1924 static void save_flow_state(void)
1928 __add_ptr_list(&backup
, INT_PTR(loop_num
<< 2));
1929 __add_ptr_list(&backup
, INT_PTR(loop_count
<< 2));
1930 __add_ptr_list(&backup
, INT_PTR(final_pass
<< 2));
1932 __add_ptr_list(&backup
, big_statement_stack
);
1933 __add_ptr_list(&backup
, big_expression_stack
);
1934 __add_ptr_list(&backup
, big_condition_stack
);
1935 __add_ptr_list(&backup
, switch_expr_stack
);
1937 __add_ptr_list(&backup
, cur_func_sym
);
1939 __add_ptr_list(&backup
, __prev_stmt
);
1940 __add_ptr_list(&backup
, __cur_stmt
);
1941 __add_ptr_list(&backup
, __next_stmt
);
1943 FOR_EACH_PTR(fn_data_list
, tmp
) {
1944 __add_ptr_list(&backup
, (void *)*tmp
);
1945 } END_FOR_EACH_PTR(tmp
);
1948 static void *pop_backup(void)
1952 ret
= last_ptr_list(backup
);
1953 delete_ptr_list_last(&backup
);
1957 static void restore_flow_state(void)
1961 FOR_EACH_PTR_REVERSE(fn_data_list
, tmp
) {
1962 *tmp
= (unsigned long)pop_backup();
1963 } END_FOR_EACH_PTR_REVERSE(tmp
);
1965 __next_stmt
= pop_backup();
1966 __cur_stmt
= pop_backup();
1967 __prev_stmt
= pop_backup();
1969 cur_func_sym
= pop_backup();
1970 switch_expr_stack
= pop_backup();
1971 big_condition_stack
= pop_backup();
1972 big_expression_stack
= pop_backup();
1973 big_statement_stack
= pop_backup();
1974 final_pass
= PTR_INT(pop_backup()) >> 2;
1975 loop_count
= PTR_INT(pop_backup()) >> 2;
1976 loop_num
= PTR_INT(pop_backup()) >> 2;
1979 static void parse_inline(struct expression
*call
)
1981 struct symbol
*base_type
;
1982 char *cur_func_bak
= cur_func
; /* not aligned correctly for backup */
1983 struct timeval time_backup
= fn_start_time
;
1984 struct expression
*orig_inline
= __inline_fn
;
1987 if (out_of_memory() || taking_too_long())
1992 __pass_to_client(call
, INLINE_FN_START
);
1993 final_pass
= 0; /* don't print anything */
1995 orig_budget
= inline_budget
;
1996 inline_budget
= inline_budget
- 5;
1998 base_type
= get_base_type(call
->fn
->symbol
);
1999 cur_func_sym
= call
->fn
->symbol
;
2000 if (call
->fn
->symbol
->ident
)
2001 cur_func
= call
->fn
->symbol
->ident
->name
;
2004 set_position(call
->fn
->symbol
->pos
);
2007 big_statement_stack
= NULL
;
2008 big_expression_stack
= NULL
;
2009 big_condition_stack
= NULL
;
2010 switch_expr_stack
= NULL
;
2012 sm_debug("inline function: %s\n", cur_func
);
2014 clear_function_data();
2017 start_function_definition(call
->fn
->symbol
);
2018 __split_stmt(base_type
->stmt
);
2019 __split_stmt(base_type
->inline_stmt
);
2020 __pass_to_client(call
->fn
->symbol
, END_FUNC_HOOK
);
2021 __pass_to_client(call
->fn
->symbol
, AFTER_FUNC_HOOK
);
2022 call
->fn
->symbol
->parsed
= true;
2024 free_expression_stack(&switch_expr_stack
);
2025 __free_ptr_list((struct ptr_list
**)&big_statement_stack
);
2029 restore_flow_state();
2030 fn_start_time
= time_backup
;
2031 cur_func
= cur_func_bak
;
2033 restore_all_states();
2034 set_position(call
->pos
);
2035 __inline_fn
= orig_inline
;
2036 inline_budget
= orig_budget
;
2037 __pass_to_client(call
, INLINE_FN_END
);
2040 static struct symbol_list
*inlines_called
;
2041 static void add_inline_function(struct symbol
*sym
)
2043 static struct symbol_list
*already_added
;
2046 FOR_EACH_PTR(already_added
, tmp
) {
2049 } END_FOR_EACH_PTR(tmp
);
2051 add_ptr_list(&already_added
, sym
);
2052 add_ptr_list(&inlines_called
, sym
);
2055 static void process_inlines(void)
2059 FOR_EACH_PTR(inlines_called
, tmp
) {
2060 split_function(tmp
);
2061 } END_FOR_EACH_PTR(tmp
);
2062 free_ptr_list(&inlines_called
);
2065 static struct symbol
*get_last_scoped_symbol(struct symbol_list
*big_list
, int use_static
)
2069 FOR_EACH_PTR_REVERSE(big_list
, sym
) {
2072 if (use_static
&& sym
->ctype
.modifiers
& MOD_STATIC
)
2074 if (!use_static
&& !(sym
->ctype
.modifiers
& MOD_STATIC
))
2076 } END_FOR_EACH_PTR_REVERSE(sym
);
2081 static bool interesting_function(struct symbol
*sym
)
2083 static int prev_stream
= -1;
2084 static bool prev_answer
;
2085 const char *filename
;
2088 if (!(sym
->ctype
.modifiers
& MOD_INLINE
))
2091 if (sym
->pos
.stream
== prev_stream
)
2094 prev_stream
= sym
->pos
.stream
;
2095 prev_answer
= false;
2097 filename
= stream_name(sym
->pos
.stream
);
2098 len
= strlen(filename
);
2099 if (len
> 0 && filename
[len
- 1] == 'c')
2104 static void split_inlines_in_scope(struct symbol
*sym
)
2106 struct symbol
*base
;
2107 struct symbol_list
*scope_list
;
2110 scope_list
= sym
->scope
->symbols
;
2111 stream
= sym
->pos
.stream
;
2113 /* find the last static symbol in the file */
2114 FOR_EACH_PTR_REVERSE(scope_list
, sym
) {
2115 if (sym
->pos
.stream
!= stream
)
2117 if (sym
->type
!= SYM_NODE
)
2119 base
= get_base_type(sym
);
2122 if (base
->type
!= SYM_FN
)
2124 if (!base
->inline_stmt
)
2126 if (!interesting_function(sym
))
2128 add_inline_function(sym
);
2129 } END_FOR_EACH_PTR_REVERSE(sym
);
2134 static void split_inlines(struct symbol_list
*sym_list
)
2138 sym
= get_last_scoped_symbol(sym_list
, 0);
2140 split_inlines_in_scope(sym
);
2141 sym
= get_last_scoped_symbol(sym_list
, 1);
2143 split_inlines_in_scope(sym
);
2146 static struct stree
*clone_estates_perm(struct stree
*orig
)
2148 struct stree
*ret
= NULL
;
2149 struct sm_state
*tmp
;
2151 FOR_EACH_SM(orig
, tmp
) {
2152 set_state_stree_perm(&ret
, tmp
->owner
, tmp
->name
, tmp
->sym
, clone_estate_perm(tmp
->state
));
2153 } END_FOR_EACH_SM(tmp
);
2158 struct position last_pos
;
2159 static void split_c_file_functions(struct symbol_list
*sym_list
)
2164 FOR_EACH_PTR(sym_list
, sym
) {
2165 set_position(sym
->pos
);
2166 if (sym
->type
!= SYM_NODE
|| get_base_type(sym
)->type
!= SYM_FN
) {
2167 __pass_to_client(sym
, BASE_HOOK
);
2168 fake_global_assign(sym
);
2169 __pass_to_client(sym
, DECLARATION_HOOK_AFTER
);
2171 } END_FOR_EACH_PTR(sym
);
2172 global_states
= clone_estates_perm(get_all_states_stree(SMATCH_EXTRA
));
2175 FOR_EACH_PTR(sym_list
, sym
) {
2176 set_position(sym
->pos
);
2177 last_pos
= sym
->pos
;
2178 if (!interesting_function(sym
))
2180 if (sym
->type
== SYM_NODE
&& get_base_type(sym
)->type
== SYM_FN
) {
2181 split_function(sym
);
2184 last_pos
= sym
->pos
;
2185 } END_FOR_EACH_PTR(sym
);
2186 split_inlines(sym_list
);
2187 __pass_to_client(sym_list
, END_FILE_HOOK
);
2190 static int final_before_fake
;
2191 void init_fake_env(void)
2194 final_before_fake
= final_pass
;
2196 __push_fake_cur_stree();
2200 void end_fake_env(void)
2202 __free_fake_cur_stree();
2205 final_pass
= final_before_fake
;
2208 static void open_output_files(char *base_file
)
2212 snprintf(buf
, sizeof(buf
), "%s.smatch", base_file
);
2213 sm_outfd
= fopen(buf
, "w");
2215 sm_fatal("Cannot open %s", buf
);
2220 snprintf(buf
, sizeof(buf
), "%s.smatch.sql", base_file
);
2221 sql_outfd
= fopen(buf
, "w");
2223 sm_fatal("Error: Cannot open %s", buf
);
2225 snprintf(buf
, sizeof(buf
), "%s.smatch.caller_info", base_file
);
2226 caller_info_fd
= fopen(buf
, "w");
2227 if (!caller_info_fd
)
2228 sm_fatal("Error: Cannot open %s", buf
);
2231 void smatch(struct string_list
*filelist
)
2233 struct symbol_list
*sym_list
;
2234 struct timeval stop
, start
;
2238 gettimeofday(&start
, NULL
);
2240 FOR_EACH_PTR_NOTAG(filelist
, base_file
) {
2241 path
= getcwd(NULL
, 0);
2242 free(full_base_file
);
2244 len
= strlen(path
) + 1 + strlen(base_file
) + 1;
2245 full_base_file
= malloc(len
);
2246 snprintf(full_base_file
, len
, "%s/%s", path
, base_file
);
2248 full_base_file
= alloc_string(base_file
);
2250 if (option_file_output
)
2251 open_output_files(base_file
);
2252 base_file_stream
= input_stream_nr
;
2253 sym_list
= sparse_keep_tokens(base_file
);
2254 split_c_file_functions(sym_list
);
2255 } END_FOR_EACH_PTR_NOTAG(base_file
);
2257 gettimeofday(&stop
, NULL
);
2259 set_position(last_pos
);
2262 sm_msg("time: %lu", stop
.tv_sec
- start
.tv_sec
);
2264 sm_msg("mem: %luKb", get_max_memory());