1 | /* Functions to enable and disable individual warnings on an expression |
2 | and statement basis. |
3 | Copyright (C) 2021-2023 Free Software Foundation, Inc. |
4 | Contributed by Martin Sebor <msebor@redhat.com> |
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 "cgraph.h" |
29 | #include "hash-map.h" |
30 | #include "diagnostic-spec.h" |
31 | #include "pretty-print.h" |
32 | #include "options.h" |
33 | |
34 | /* Initialize *THIS from warning option OPT. */ |
35 | |
36 | nowarn_spec_t::nowarn_spec_t (opt_code opt) |
37 | { |
38 | /* Create a very simple mapping based on testing and experience. |
39 | It should become more refined with time. */ |
40 | switch (opt) |
41 | { |
42 | case no_warning: |
43 | m_bits = 0; |
44 | break; |
45 | |
46 | case all_warnings: |
47 | m_bits = -1; |
48 | break; |
49 | |
50 | /* Flow-sensitive warnings about pointer problems issued by both |
51 | front ends and the middle end. */ |
52 | case OPT_Waddress: |
53 | case OPT_Wnonnull: |
54 | m_bits = NW_NONNULL; |
55 | break; |
56 | |
57 | /* Flow-sensitive warnings about arithmetic overflow issued by both |
58 | front ends and the middle end. */ |
59 | case OPT_Woverflow: |
60 | case OPT_Wshift_count_negative: |
61 | case OPT_Wshift_count_overflow: |
62 | case OPT_Wstrict_overflow: |
63 | m_bits = NW_VFLOW; |
64 | break; |
65 | |
66 | /* Lexical warnings issued by front ends. */ |
67 | case OPT_Wabi: |
68 | case OPT_Wlogical_op: |
69 | case OPT_Wparentheses: |
70 | case OPT_Wreturn_type: |
71 | case OPT_Wsizeof_array_div: |
72 | case OPT_Wstrict_aliasing: |
73 | case OPT_Wunused: |
74 | case OPT_Wunused_function: |
75 | case OPT_Wunused_but_set_variable: |
76 | case OPT_Wunused_variable: |
77 | case OPT_Wunused_but_set_parameter: |
78 | m_bits = NW_LEXICAL; |
79 | break; |
80 | |
81 | /* Access warning group. */ |
82 | case OPT_Warray_bounds_: |
83 | case OPT_Wformat_overflow_: |
84 | case OPT_Wformat_truncation_: |
85 | case OPT_Wrestrict: |
86 | case OPT_Wsizeof_pointer_memaccess: |
87 | case OPT_Wstrict_aliasing_: |
88 | case OPT_Wstringop_overflow_: |
89 | case OPT_Wstringop_overread: |
90 | case OPT_Wstringop_truncation: |
91 | m_bits = NW_ACCESS; |
92 | break; |
93 | |
94 | /* Initialization warning group. */ |
95 | case OPT_Winit_self: |
96 | case OPT_Wuninitialized: |
97 | case OPT_Wmaybe_uninitialized: |
98 | m_bits = NW_UNINIT; |
99 | break; |
100 | |
101 | case OPT_Wdangling_pointer_: |
102 | case OPT_Wreturn_local_addr: |
103 | case OPT_Wuse_after_free_: |
104 | m_bits = NW_DANGLING; |
105 | break; |
106 | |
107 | case OPT_Wpessimizing_move: |
108 | case OPT_Wredundant_move: |
109 | m_bits = NW_REDUNDANT; |
110 | break; |
111 | |
112 | default: |
113 | /* A catchall group for everything else. */ |
114 | m_bits = NW_OTHER; |
115 | } |
116 | } |
117 | |
118 | /* A mapping from a 'location_t' to the warning spec set for it. */ |
119 | |
120 | GTY(()) nowarn_map_t *nowarn_map; |
121 | |
122 | /* Return the no-warning disposition for location LOC and option OPT |
123 | or for all/any otions by default. */ |
124 | |
125 | bool |
126 | warning_suppressed_at (location_t loc, opt_code opt /* = all_warnings */) |
127 | { |
128 | gcc_checking_assert (!RESERVED_LOCATION_P (loc)); |
129 | |
130 | if (!nowarn_map) |
131 | return false; |
132 | |
133 | if (const nowarn_spec_t* const pspec = nowarn_map->get (k: loc)) |
134 | { |
135 | const nowarn_spec_t optspec (opt); |
136 | return *pspec & optspec; |
137 | } |
138 | |
139 | return false; |
140 | } |
141 | |
142 | /* Change the supression of warnings for location LOC. |
143 | OPT controls which warnings are affected. |
144 | The wildcard OPT of -1 controls all warnings. |
145 | If SUPP is true (the default), enable the suppression of the warnings. |
146 | If SUPP is false, disable the suppression of the warnings. */ |
147 | |
148 | bool |
149 | suppress_warning_at (location_t loc, opt_code opt /* = all_warnings */, |
150 | bool supp /* = true */) |
151 | { |
152 | gcc_checking_assert (!RESERVED_LOCATION_P (loc)); |
153 | |
154 | const nowarn_spec_t optspec (supp ? opt : opt_code ()); |
155 | |
156 | if (nowarn_spec_t *pspec = nowarn_map ? nowarn_map->get (k: loc) : NULL) |
157 | { |
158 | if (supp) |
159 | { |
160 | *pspec |= optspec; |
161 | return true; |
162 | } |
163 | |
164 | *pspec &= optspec; |
165 | if (*pspec) |
166 | return true; |
167 | |
168 | nowarn_map->remove (k: loc); |
169 | return false; |
170 | } |
171 | |
172 | if (!supp || opt == no_warning) |
173 | return false; |
174 | |
175 | if (!nowarn_map) |
176 | nowarn_map = nowarn_map_t::create_ggc (size: 32); |
177 | |
178 | nowarn_map->put (k: loc, v: optspec); |
179 | return true; |
180 | } |
181 | |
182 | /* Copy the no-warning disposition from one location to another. */ |
183 | |
184 | void |
185 | copy_warning (location_t to, location_t from) |
186 | { |
187 | if (!nowarn_map) |
188 | return; |
189 | |
190 | nowarn_spec_t *from_spec; |
191 | if (RESERVED_LOCATION_P (from)) |
192 | from_spec = NULL; |
193 | else |
194 | from_spec = nowarn_map->get (k: from); |
195 | if (RESERVED_LOCATION_P (to)) |
196 | /* We cannot set no-warning dispositions for 'to', so we have no chance but |
197 | lose those potentially set for 'from'. */ |
198 | ; |
199 | else |
200 | { |
201 | if (from_spec) |
202 | { |
203 | nowarn_spec_t tem = *from_spec; |
204 | nowarn_map->put (k: to, v: tem); |
205 | } |
206 | else |
207 | nowarn_map->remove (k: to); |
208 | } |
209 | } |
210 | |