param_key: remove some bogus warning messages
[smatch.git] / smatch_param_used.c
blobc494840990ecf95d0268695b4c935ec9ce4cd1b0
1 /*
2 * Copyright (C) 2015 Oracle.
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
18 #include "smatch.h"
19 #include "smatch_slist.h"
21 static int my_id;
22 int __ignore_param_used;
24 static struct stree *used_stree;
26 STATE(used);
28 static void get_state_hook(int owner, const char *name, struct symbol *sym)
30 static const char *prev;
31 int arg;
33 if (!option_info)
34 return;
36 if (__ignore_param_used ||
37 __in_fake_assign ||
38 __in_fake_parameter_assign ||
39 __in_function_def ||
40 __in_unmatched_hook)
41 return;
43 if (!name || name[0] == '&')
44 return;
46 if (name == prev)
47 return;
48 prev = name;
50 arg = get_param_num_from_sym(sym);
51 if (arg < 0)
52 return;
53 if (param_was_set_var_sym(name, sym))
54 return;
55 if (parent_was_PARAM_CLEAR(name, sym))
56 return;
58 set_state_stree(&used_stree, my_id, name, sym, &used);
61 static void set_param_used(struct expression *call, struct expression *arg, char *key, char *unused)
63 struct symbol *sym;
64 char *name;
65 int arg_nr;
67 if (!option_info)
68 return;
70 if (key[0] == '&')
71 return;
73 name = get_variable_from_key(arg, key, &sym);
74 if (!name || !sym)
75 goto free;
77 arg_nr = get_param_num_from_sym(sym);
78 if (arg_nr < 0)
79 goto free;
80 if (param_was_set_var_sym(name, sym))
81 goto free;
82 set_state_stree(&used_stree, my_id, name, sym, &used);
83 free:
84 free_string(name);
87 static void process_states(void)
89 struct sm_state *tmp;
90 int arg;
91 const char *name;
93 FOR_EACH_SM(used_stree, tmp) {
94 arg = get_param_num_from_sym(tmp->sym);
95 if (arg < 0)
96 continue;
97 name = get_param_name(tmp);
98 if (!name)
99 continue;
100 if (strcmp(name, "$") == 0 ||
101 strcmp(name, "*$") == 0)
102 continue;
103 if (is_recursive_member(name))
104 continue;
106 if (is_ignored_kernel_data(name))
107 continue;
109 sql_insert_return_implies(PARAM_USED, arg, name, "");
110 } END_FOR_EACH_SM(tmp);
112 free_stree(&used_stree);
115 static void match_function_def(struct symbol *sym)
117 free_stree(&used_stree);
120 void register_param_used(int id)
122 my_id = id;
124 add_hook(&match_function_def, AFTER_FUNC_HOOK);
125 add_function_data((unsigned long *)&used_stree);
127 add_get_state_hook(&get_state_hook);
129 select_return_implies_hook(PARAM_USED, &set_param_used);
130 all_return_states_hook(&process_states);