1 | /* Functions to enable and disable individual warnings on an expression |
2 | and statement basis. |
3 | |
4 | Copyright (C) 2021-2023 Free Software Foundation, Inc. |
5 | |
6 | This file is part of GCC. |
7 | |
8 | GCC is free software; you can redistribute it and/or modify it under |
9 | the terms of the GNU General Public License as published by the Free |
10 | Software Foundation; either version 3, or (at your option) any later |
11 | version. |
12 | |
13 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
14 | WARRANTY; without even the implied warranty of MERCHANTABILITY or |
15 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
16 | for more details. |
17 | |
18 | You should have received a copy of the GNU General Public License |
19 | along with GCC; see the file COPYING3. If not see |
20 | <http://www.gnu.org/licenses/>. */ |
21 | |
22 | #include "config.h" |
23 | #include "system.h" |
24 | #include "coretypes.h" |
25 | #include "backend.h" |
26 | #include "bitmap.h" |
27 | #include "tree.h" |
28 | #include "gimple.h" |
29 | #include "cgraph.h" |
30 | #include "hash-map.h" |
31 | #include "diagnostic-spec.h" |
32 | |
33 | /* Return the no-warning bit for EXPR. */ |
34 | |
35 | static inline bool |
36 | get_no_warning_bit (const_tree expr) |
37 | { |
38 | return expr->base.nowarning_flag; |
39 | } |
40 | |
41 | /* Return the no-warning bit for statement STMT. */ |
42 | |
43 | static inline bool |
44 | get_no_warning_bit (const gimple *stmt) |
45 | { |
46 | return stmt->no_warning; |
47 | } |
48 | |
49 | /* Set the no-warning bit for EXPR to VALUE. */ |
50 | |
51 | static inline void |
52 | set_no_warning_bit (tree expr, bool value) |
53 | { |
54 | expr->base.nowarning_flag = value; |
55 | } |
56 | |
57 | /* Set the no-warning bit for statement STMT to VALUE. */ |
58 | |
59 | static inline void |
60 | set_no_warning_bit (gimple *stmt, bool value) |
61 | { |
62 | stmt->no_warning = value; |
63 | } |
64 | |
65 | /* Return EXPR location or 'UNKNOWN_LOCATION'. */ |
66 | |
67 | static inline location_t |
68 | get_location (const_tree expr) |
69 | { |
70 | if (DECL_P (expr)) |
71 | return DECL_SOURCE_LOCATION (expr); |
72 | if (EXPR_P (expr)) |
73 | return EXPR_LOCATION (expr); |
74 | return UNKNOWN_LOCATION; |
75 | } |
76 | |
77 | /* Return STMT location (may be 'UNKNOWN_LOCATION'). */ |
78 | |
79 | static inline location_t |
80 | get_location (const gimple *stmt) |
81 | { |
82 | return gimple_location (g: stmt); |
83 | } |
84 | |
85 | /* Return the no-warning bitmap for decl/expression EXPR. */ |
86 | |
87 | static nowarn_spec_t * |
88 | get_nowarn_spec (const_tree expr) |
89 | { |
90 | const location_t loc = get_location (expr); |
91 | |
92 | if (RESERVED_LOCATION_P (loc)) |
93 | return NULL; |
94 | |
95 | if (!get_no_warning_bit (expr)) |
96 | return NULL; |
97 | |
98 | return nowarn_map ? nowarn_map->get (k: loc) : NULL; |
99 | } |
100 | |
101 | /* Return the no-warning bitmap for statement STMT. */ |
102 | |
103 | static nowarn_spec_t * |
104 | get_nowarn_spec (const gimple *stmt) |
105 | { |
106 | const location_t loc = get_location (stmt); |
107 | |
108 | if (RESERVED_LOCATION_P (loc)) |
109 | return NULL; |
110 | |
111 | if (!get_no_warning_bit (stmt)) |
112 | return NULL; |
113 | |
114 | return nowarn_map ? nowarn_map->get (k: loc) : NULL; |
115 | } |
116 | |
117 | /* Return true if warning OPT is suppressed for decl/expression EXPR. |
118 | By default tests the disposition for any warning. */ |
119 | |
120 | bool |
121 | warning_suppressed_p (const_tree expr, opt_code opt /* = all_warnings */) |
122 | { |
123 | const nowarn_spec_t *spec = get_nowarn_spec (expr); |
124 | |
125 | if (!spec) |
126 | return get_no_warning_bit (expr); |
127 | |
128 | const nowarn_spec_t optspec (opt); |
129 | bool dis = *spec & optspec; |
130 | gcc_assert (get_no_warning_bit (expr) || !dis); |
131 | return dis; |
132 | } |
133 | |
134 | /* Return true if warning OPT is suppressed for statement STMT. |
135 | By default tests the disposition for any warning. */ |
136 | |
137 | bool |
138 | warning_suppressed_p (const gimple *stmt, opt_code opt /* = all_warnings */) |
139 | { |
140 | const nowarn_spec_t *spec = get_nowarn_spec (stmt); |
141 | |
142 | if (!spec) |
143 | /* Fall back on the single no-warning bit. */ |
144 | return get_no_warning_bit (stmt); |
145 | |
146 | const nowarn_spec_t optspec (opt); |
147 | bool dis = *spec & optspec; |
148 | gcc_assert (get_no_warning_bit (stmt) || !dis); |
149 | return dis; |
150 | } |
151 | |
152 | /* Enable, or by default disable, a warning for the expression. |
153 | The wildcard OPT of -1 controls all warnings. */ |
154 | |
155 | void |
156 | suppress_warning (tree expr, opt_code opt /* = all_warnings */, |
157 | bool supp /* = true */) |
158 | { |
159 | if (opt == no_warning) |
160 | return; |
161 | |
162 | const location_t loc = get_location (expr); |
163 | |
164 | if (!RESERVED_LOCATION_P (loc)) |
165 | supp = suppress_warning_at (loc, opt, supp) || supp; |
166 | set_no_warning_bit (expr, value: supp); |
167 | } |
168 | |
169 | /* Enable, or by default disable, a warning for the statement STMT. |
170 | The wildcard OPT of -1 controls all warnings. */ |
171 | |
172 | void |
173 | suppress_warning (gimple *stmt, opt_code opt /* = all_warnings */, |
174 | bool supp /* = true */) |
175 | { |
176 | if (opt == no_warning) |
177 | return; |
178 | |
179 | const location_t loc = get_location (stmt); |
180 | |
181 | if (!RESERVED_LOCATION_P (loc)) |
182 | supp = suppress_warning_at (loc, opt, supp) || supp; |
183 | set_no_warning_bit (stmt, value: supp); |
184 | } |
185 | |
186 | /* Copy the warning disposition mapping between an expression and/or |
187 | a statement. */ |
188 | |
189 | template <class ToType, class FromType> |
190 | void copy_warning (ToType to, FromType from) |
191 | { |
192 | const location_t to_loc = get_location (to); |
193 | |
194 | const bool supp = get_no_warning_bit (from); |
195 | |
196 | nowarn_spec_t *from_spec = get_nowarn_spec (from); |
197 | if (RESERVED_LOCATION_P (to_loc)) |
198 | /* We cannot set no-warning dispositions for 'to', so we have no chance but |
199 | lose those potentially set for 'from'. */ |
200 | ; |
201 | else |
202 | { |
203 | if (from_spec) |
204 | { |
205 | /* If there's an entry in the map the no-warning bit must be set. */ |
206 | gcc_assert (supp); |
207 | |
208 | gcc_checking_assert (nowarn_map); |
209 | nowarn_spec_t tem = *from_spec; |
210 | nowarn_map->put (k: to_loc, v: tem); |
211 | } |
212 | else if (supp) |
213 | { |
214 | if (nowarn_map) |
215 | nowarn_map->remove (k: to_loc); |
216 | } |
217 | } |
218 | |
219 | /* The no-warning bit might be set even if the map has not been consulted, or |
220 | otherwise if there's no entry in the map. */ |
221 | set_no_warning_bit (to, supp); |
222 | } |
223 | |
224 | /* Copy the warning disposition mapping from one expression to another. */ |
225 | |
226 | void |
227 | copy_warning (tree to, const_tree from) |
228 | { |
229 | if (to == from) |
230 | return; |
231 | copy_warning<tree, const_tree>(to, from); |
232 | } |
233 | |
234 | /* Copy the warning disposition mapping from a statement to an expression. */ |
235 | |
236 | void |
237 | copy_warning (tree to, const gimple *from) |
238 | { |
239 | copy_warning<tree, const gimple *>(to, from); |
240 | } |
241 | |
242 | /* Copy the warning disposition mapping from an expression to a statement. */ |
243 | |
244 | void |
245 | copy_warning (gimple *to, const_tree from) |
246 | { |
247 | copy_warning<gimple *, const_tree>(to, from); |
248 | } |
249 | |
250 | /* Copy the warning disposition mapping from one statement to another. */ |
251 | |
252 | void |
253 | copy_warning (gimple *to, const gimple *from) |
254 | { |
255 | if (to == from) |
256 | return; |
257 | copy_warning<gimple *, const gimple *>(to, from); |
258 | } |
259 | |