1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
|
/* EINA - EFL data type library
* Copyright (C) 2008 Gustavo Sverzut Barbieri
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library;
* if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef EINA_SAFETY_CHECKS_H_
#define EINA_SAFETY_CHECKS_H_
/**
* @addtogroup Eina_Tools_Group Tools
*
* @{
*/
/**
* @defgroup Eina_Safety_Checks_Group Safety Checks
*
* @warning @c eina_safety_checks.h should only be included by source
* files, after all other includes and before the source file
* specific includes. By source file specific includes we
* mean those that define the functions that are being
* checked. The reason for such complexity is the trick to
* avoid compiler optimizations. If compilers are told that
* some given function will never receive @c NULL
* (EINA_ARG_NONNULL(), then compiler will emit a warning if
* it detects so (good!) but will remove any checks for that
* condition as it believes it will never happen, removing
* all safety checks! By including @c eina_safety_checks.h it
* will redefine EINA_ARG_NONNULL() to void and compiler
* warning will not be emitted, but checks will be there. The
* files already processed with the old macro
* EINA_ARG_NONNULL() will still work and emit the warnings.
*
*
* @code
*
* // all these files will emit warning from EINA_ARG_NONNULL()
* #include <Evas.h> // third party headers
* #include <Ecore.h>
* #include <eina_error.h> // eina own header
*
* #include <eina_safety_checks.h>
* // all these files below will NOT emit warning from EINA_ARG_NONNULL(),
* // but this is required to have the functions defined there to be checked
* // for NULL pointers
* #include "my_functions1.h"
* #include "my_functions2.h"
*
* @endcode
*/
/**
* @addtogroup Eina_Safety_Checks_Group Safety Checks
*
* Safety checks are a set of macros to check for parameters or values
* that should never happen, it is similar in concept to assert(), but
* will log and return instead of abort() your program.
*
* Since these cases should never happen, one may wantto keep safety
* checks enabled during tests but disable then during deploy, not
* doing any checks at all. This is a common requirement for embedded
* systems. Whenever to check or not should be set during compile time
* by using @c --disable-safety-checks or @c --enable-safety-checks
* options to @c configure script.
*
* Whenever these macros capture an error, EINA_LOG_ERR() will be
* called and @c eina_error set to @c EINA_ERROR_SAFETY_FAILED and can
* be checked with eina_error_get() after call.
*
* @see EINA_SAFETY_ON_NULL_RETURN(), EINA_SAFETY_ON_NULL_RETURN_VAL()
* and other macros.
*
* @{
*/
#include "eina_config.h"
#include "eina_error.h"
/**
* @var EINA_ERROR_SAFETY_FAILED
* Error identifier corresponding to safety check failure.
*/
EAPI extern Eina_Error EINA_ERROR_SAFETY_FAILED;
#ifdef EINA_SAFETY_CHECKS
#include "eina_log.h"
#define EINA_SAFETY_ON_NULL_RETURN(exp) \
do \
{ \
if (EINA_UNLIKELY((exp) == NULL)) \
{ \
eina_error_set(EINA_ERROR_SAFETY_FAILED); \
EINA_LOG_ERR("%s", "safety check failed: " # exp " == NULL"); \
return; \
} \
} \
while (0)
#define EINA_SAFETY_ON_NULL_RETURN_VAL(exp, val) \
do \
{ \
if (EINA_UNLIKELY((exp) == NULL)) \
{ \
eina_error_set(EINA_ERROR_SAFETY_FAILED); \
EINA_LOG_ERR("%s", "safety check failed: " # exp " == NULL"); \
return (val); \
} \
} \
while (0)
#define EINA_SAFETY_ON_NULL_GOTO(exp, label) \
do \
{ \
if (EINA_UNLIKELY((exp) == NULL)) \
{ \
eina_error_set(EINA_ERROR_SAFETY_FAILED); \
EINA_LOG_ERR("%s", "safety check failed: " # exp " == NULL"); \
goto label; \
} \
} \
while (0)
#define EINA_SAFETY_ON_TRUE_RETURN(exp) \
do \
{ \
if (EINA_UNLIKELY(exp)) \
{ \
eina_error_set(EINA_ERROR_SAFETY_FAILED); \
EINA_LOG_ERR("%s", "safety check failed: " # exp " is true"); \
return; \
} \
} \
while (0)
#define EINA_SAFETY_ON_TRUE_RETURN_VAL(exp, val) \
do \
{ \
if (EINA_UNLIKELY(exp)) \
{ \
eina_error_set(EINA_ERROR_SAFETY_FAILED); \
EINA_LOG_ERR("%s", "safety check failed: " # exp " is true"); \
return val; \
} \
} \
while (0)
#define EINA_SAFETY_ON_TRUE_GOTO(exp, label) \
do \
{ \
if (EINA_UNLIKELY(exp)) \
{ \
eina_error_set(EINA_ERROR_SAFETY_FAILED); \
EINA_LOG_ERR("%s", "safety check failed: " # exp " is true"); \
goto label; \
} \
} \
while (0)
#define EINA_SAFETY_ON_FALSE_RETURN(exp) \
do \
{ \
if (EINA_UNLIKELY(!(exp))) \
{ \
eina_error_set(EINA_ERROR_SAFETY_FAILED); \
EINA_LOG_ERR("%s", "safety check failed: " # exp " is false"); \
return; \
} \
} \
while (0)
#define EINA_SAFETY_ON_FALSE_RETURN_VAL(exp, val) \
do \
{ \
if (EINA_UNLIKELY(!(exp))) \
{ \
eina_error_set(EINA_ERROR_SAFETY_FAILED); \
EINA_LOG_ERR("%s", "safety check failed: " # exp " is false"); \
return val; \
} \
} \
while (0)
#define EINA_SAFETY_ON_FALSE_GOTO(exp, label) \
do \
{ \
if (EINA_UNLIKELY(!(exp))) \
{ \
eina_error_set(EINA_ERROR_SAFETY_FAILED); \
EINA_LOG_ERR("%s", "safety check failed: " # exp " is false"); \
goto label; \
} \
} \
while (0)
#ifdef EINA_ARG_NONNULL
/* make EINA_ARG_NONNULL void so GCC does not optimize safety checks */
#undef EINA_ARG_NONNULL
#define EINA_ARG_NONNULL(idx, ...)
#endif
#else /* no safety checks */
#define EINA_SAFETY_ON_NULL_RETURN(exp) \
do { (void)(!(exp)); } while (0)
#define EINA_SAFETY_ON_NULL_RETURN_VAL(exp, val) \
do { if (0 && !(exp)) { (void)val; } } while (0)
#define EINA_SAFETY_ON_NULL_GOTO(exp, label) \
do { if (0 && (exp) == NULL) { goto label; } } while (0)
#define EINA_SAFETY_ON_TRUE_RETURN(exp) \
do { (void)(exp); } while (0)
#define EINA_SAFETY_ON_TRUE_RETURN_VAL(exp, val) \
do { if (0 && (exp)) { (void)val; } } while (0)
#define EINA_SAFETY_ON_TRUE_GOTO(exp, label) \
do { if (0 && (exp)) { goto label; } } while (0)
#define EINA_SAFETY_ON_FALSE_RETURN(exp) \
do { (void)(!(exp)); } while (0)
#define EINA_SAFETY_ON_FALSE_RETURN_VAL(exp, val) \
do { if (0 && !(exp)) { (void)val; } } while (0)
#define EINA_SAFETY_ON_FALSE_GOTO(exp, label) \
do { if (0 && !(exp)) { goto label; } } while (0)
#endif /* safety checks macros */
#endif /* EINA_SAFETY_CHECKS_H_ */
/**
* @}
*/
/**
* @}
*/
|
