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11972 resync smatch
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--- old/usr/src/tools/smatch/src/smatch_param_filter.c
+++ new/usr/src/tools/smatch/src/smatch_param_filter.c
1 1 /*
2 2 * Copyright (C) 2012 Oracle.
3 3 *
4 4 * This program is free software; you can redistribute it and/or
5 5 * modify it under the terms of the GNU General Public License
6 6 * as published by the Free Software Foundation; either version 2
7 7 * of the License, or (at your option) any later version.
8 8 *
9 9 * This program is distributed in the hope that it will be useful,
10 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 12 * GNU General Public License for more details.
13 13 *
14 14 * You should have received a copy of the GNU General Public License
15 15 * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
16 16 */
17 17
18 18 /*
19 19 * This is for functions like:
20 20 *
21 21 * void foo(int *x)
22 22 * {
23 23 * if (*x == 42)
24 24 * *x = 0;
25 25 * }
26 26 *
27 27 * The final value of *x depends on the input to the function but with *x == 42
28 28 * filtered out.
29 29 *
30 30 */
31 31
32 32 #include "smatch.h"
33 33 #include "smatch_extra.h"
34 34 #include "smatch_slist.h"
35 35
36 36 static int my_id;
37 37
38 38 static struct stree *start_states;
39 39 static struct stree_stack *saved_stack;
40 40 static void save_start_states(struct statement *stmt)
41 41 {
42 42 start_states = get_all_states_stree(SMATCH_EXTRA);
43 43 }
44 44
45 45 static void free_start_states(void)
46 46 {
47 47 free_stree(&start_states);
48 48 }
49 49
50 50 static void match_save_states(struct expression *expr)
51 51 {
52 52 push_stree(&saved_stack, start_states);
53 53 start_states = NULL;
54 54 }
55 55
56 56 static void match_restore_states(struct expression *expr)
57 57 {
58 58 free_stree(&start_states);
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59 59 start_states = pop_stree(&saved_stack);
60 60 }
61 61
62 62 static struct smatch_state *unmatched_state(struct sm_state *sm)
63 63 {
64 64 struct smatch_state *state;
65 65
66 66 if (parent_is_gone_var_sym(sm->name, sm->sym))
67 67 return alloc_estate_empty();
68 68
69 - state = get_state(SMATCH_EXTRA, sm->name, sm->sym);
69 + state = __get_state(SMATCH_EXTRA, sm->name, sm->sym);
70 70 if (state)
71 71 return state;
72 72 return alloc_estate_whole(estate_type(sm->state));
73 73 }
74 74
75 -static void pre_merge_hook(struct sm_state *sm)
75 +static void pre_merge_hook(struct sm_state *cur, struct sm_state *other)
76 76 {
77 - struct smatch_state *extra, *mine;
77 + struct smatch_state *extra;
78 78 struct range_list *rl;
79 79
80 - if (estate_rl(sm->state))
80 + if (estate_rl(other->state))
81 81 return;
82 82
83 - extra = get_state(SMATCH_EXTRA, sm->name, sm->sym);
83 + extra = get_state(SMATCH_EXTRA, cur->name, cur->sym);
84 84 if (!extra)
85 85 return;
86 - mine = get_state(my_id, sm->name, sm->sym);
87 86
88 - rl = rl_intersection(estate_rl(extra), estate_rl(mine));
89 - if (rl_equiv(rl, estate_rl(mine)))
87 + rl = rl_intersection(estate_rl(extra), estate_rl(cur->state));
88 + if (rl_equiv(rl, estate_rl(cur->state)))
90 89 return;
91 - set_state(my_id, sm->name, sm->sym, alloc_estate_rl(clone_rl(rl)));
90 + set_state(my_id, cur->name, cur->sym, alloc_estate_rl(clone_rl(rl)));
92 91 }
93 92
94 93 static void extra_mod_hook(const char *name, struct symbol *sym, struct expression *expr, struct smatch_state *state)
95 94 {
96 95 int param;
97 96
98 97 if (__in_fake_assign)
99 98 return;
100 99
101 100 param = get_param_num_from_sym(sym);
102 101 if (param < 0)
103 102 return;
104 103
105 104 /* on stack parameters are handled in smatch_param_limit.c */
106 105 if (sym->ident && strcmp(sym->ident->name, name) == 0)
107 106 return;
108 107
109 108 set_state(my_id, name, sym, alloc_estate_empty());
110 109 }
111 110
112 111 /*
113 112 * This relies on the fact that these states are stored so that
114 113 * foo->bar is before foo->bar->baz.
115 114 */
116 115 static int parent_set(struct string_list *list, const char *name)
117 116 {
118 117 char *tmp;
119 118 int len;
120 119 int ret;
121 120
122 121 FOR_EACH_PTR(list, tmp) {
123 122 len = strlen(tmp);
124 123 ret = strncmp(tmp, name, len);
125 124 if (ret < 0)
126 125 continue;
127 126 if (ret > 0)
128 127 return 0;
129 128 if (name[len] == '-')
130 129 return 1;
131 130 } END_FOR_EACH_PTR(tmp);
132 131
133 132 return 0;
134 133 }
135 134
136 135 static void print_one_mod_param(int return_id, char *return_ranges,
137 136 int param, struct sm_state *sm, struct string_list **totally_filtered)
138 137 {
139 138 const char *param_name;
140 139
141 140 param_name = get_param_name(sm);
142 141 if (!param_name)
143 142 return;
144 143 if (is_whole_rl(estate_rl(sm->state)))
145 144 return;
146 145 if (!estate_rl(sm->state)) {
147 146 insert_string(totally_filtered, (char *)sm->name);
148 147 return;
149 148 }
150 149
151 150 if (is_ignored_kernel_data(param_name)) {
152 151 insert_string(totally_filtered, (char *)sm->name);
153 152 return;
154 153 }
155 154
156 155 sql_insert_return_states(return_id, return_ranges, PARAM_FILTER, param,
157 156 param_name, show_rl(estate_rl(sm->state)));
158 157 }
159 158
160 159 static void print_return_value_param(int return_id, char *return_ranges, struct expression *expr)
161 160 {
162 161 struct sm_state *tmp;
163 162 struct sm_state *sm;
164 163 struct string_list *totally_filtered = NULL;
165 164 int param;
166 165
167 166 FOR_EACH_MY_SM(SMATCH_EXTRA, __get_cur_stree(), tmp) {
168 167 param = get_param_num_from_sym(tmp->sym);
169 168 if (param < 0)
170 169 continue;
171 170
172 171 /* on stack parameters are handled in smatch_param_limit.c */
173 172 if (tmp->sym->ident && strcmp(tmp->sym->ident->name, tmp->name) == 0)
174 173 continue;
175 174
176 175 if (parent_set(totally_filtered, tmp->name))
177 176 continue;
178 177
179 178 sm = get_sm_state(my_id, tmp->name, tmp->sym);
180 179 if (sm)
181 180 print_one_mod_param(return_id, return_ranges, param, sm, &totally_filtered);
182 181 } END_FOR_EACH_SM(tmp);
183 182
184 183 free_ptr_list((struct ptr_list **)&totally_filtered);
185 184 }
186 185
187 186 int param_has_filter_data(struct sm_state *sm)
188 187 {
189 188 struct smatch_state *state;
190 189
191 190 state = get_state(my_id, sm->name, sm->sym);
192 191 if (!state) {
193 192 if (get_assigned_expr_name_sym(sm->name, sm->sym))
194 193 return 0;
195 194 return 1;
196 195 }
197 196 if (estate_rl(state))
198 197 return 1;
199 198 return 0;
200 199 }
201 200
202 201 void register_param_filter(int id)
203 202 {
204 203 my_id = id;
205 204
206 205 set_dynamic_states(my_id);
207 206 add_hook(&save_start_states, AFTER_DEF_HOOK);
208 207 add_hook(&free_start_states, AFTER_FUNC_HOOK);
209 208
210 209 add_extra_mod_hook(&extra_mod_hook);
211 210 add_unmatched_state_hook(my_id, &unmatched_state);
212 211 add_pre_merge_hook(my_id, &pre_merge_hook);
213 212 add_merge_hook(my_id, &merge_estates);
214 213
215 214 add_hook(&match_save_states, INLINE_FN_START);
216 215 add_hook(&match_restore_states, INLINE_FN_END);
217 216
218 217 add_split_return_callback(&print_return_value_param);
219 218 }
220 219
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