2 * sparse/check_deref_check.c
4 * Copyright (C) 2009 Dan Carpenter.
6 * Licensed under the Open Software License version 1.1
17 static void underef(const char *name
, struct symbol
*sym
, struct expression
*expr
, void *unused
)
19 set_state(my_id
, name
, sym
, &oktocheck
);
22 static void match_dereference(struct expression
*expr
)
26 if (strcmp(show_special(expr
->deref
->op
), "*"))
28 expr
= expr
->deref
->unop
;
29 expr
= strip_expr(expr
);
31 set_state_expr(my_id
, expr
, &derefed
);
33 name
= get_variable_from_expr(expr
, NULL
);
36 add_modification_hook(name
, &underef
, NULL
);
41 static void match_condition(struct expression
*expr
)
43 if (get_state_expr(my_id
, expr
) == &derefed
) {
46 name
= get_variable_from_expr(expr
, NULL
);
47 sm_msg("warn: variable derefenced before check '%s'",
49 set_state_expr(my_id
, expr
, &oktocheck
);
55 void check_deref_check(int id
)
58 set_default_state(my_id
, &oktocheck
);
59 add_hook(&match_dereference
, DEREF_HOOK
);
60 add_hook(&match_condition
, CONDITION_HOOK
);