d361d354d1d99da84cd1b6683364355d117e77e9
[babeltrace.git] / src / lib / assert-pre.h
1 /*
2 * SPDX-License-Identifier: MIT
3 *
4 * Copyright (c) 2018 EfficiOS Inc. and Linux Foundation
5 * Copyright (c) 2018 Philippe Proulx <pproulx@efficios.com>
6 */
7
8 #ifndef BABELTRACE_ASSERT_PRE_INTERNAL_H
9 #define BABELTRACE_ASSERT_PRE_INTERNAL_H
10
11 /*
12 * The macros in this header use macros defined in "lib/logging.h".
13 * We don't want this header to automatically include
14 * "lib/logging.h" because you need to manually define BT_LOG_TAG
15 * before including "lib/logging.h" and it is unexpected that you
16 * also need to define it before including this header.
17 *
18 * This is a reminder that in order to use "lib/assert-pre.h", you also
19 * need to use logging explicitly.
20 */
21
22 #ifndef BT_LIB_LOG_SUPPORTED
23 # error Include "lib/logging.h" before this header.
24 #endif
25
26 #include <stdbool.h>
27 #include <stdlib.h>
28 #include <inttypes.h>
29 #include "common/common.h"
30 #include "common/macros.h"
31
32 /*
33 * Prints the details of an unsatisfied precondition without immediately
34 * aborting. You should use this within a function which checks
35 * preconditions, but which is called from a BT_ASSERT_PRE() context, so
36 * that the function can still return its result for BT_ASSERT_PRE() to
37 * evaluate it.
38 *
39 * Example:
40 *
41 * static inline bool check_complex_precond(...)
42 * {
43 * ...
44 *
45 * if (...) {
46 * BT_ASSERT_PRE_MSG("Invalid object: ...", ...);
47 * return false;
48 * }
49 *
50 * ...
51 * }
52 *
53 * ...
54 *
55 * BT_ASSERT_PRE(check_complex_precond(...),
56 * "Precondition is not satisfied: ...", ...);
57 */
58 #define BT_ASSERT_PRE_MSG(_fmt, ...) \
59 do { \
60 bt_lib_log(_BT_LOG_SRCLOC_FUNCTION, __FILE__, \
61 __LINE__, BT_LOG_FATAL, BT_LOG_TAG, \
62 (_fmt), ##__VA_ARGS__); \
63 } while (0)
64
65 /*
66 * Asserts that the library precondition `_cond` is satisfied.
67 *
68 * If `_cond` is false, log a fatal statement using `_fmt` and the
69 * optional arguments (same usage as BT_LIB_LOGF()), and abort.
70 *
71 * To assert that a library postcondition is satisfied (return from user
72 * code), use BT_ASSERT_POST().
73 *
74 * To assert that an internal postcondition is satisfied, use
75 * BT_ASSERT() or BT_ASSERT_DBG().
76 */
77 #define BT_ASSERT_PRE(_cond, _fmt, ...) \
78 do { \
79 if (!(_cond)) { \
80 BT_ASSERT_PRE_MSG("Babeltrace 2 library precondition not satisfied; error is:"); \
81 BT_ASSERT_PRE_MSG(_fmt, ##__VA_ARGS__); \
82 BT_ASSERT_PRE_MSG("Aborting..."); \
83 bt_common_abort(); \
84 } \
85 } while (0)
86
87 /*
88 * Asserts that a given variable `_obj` named `_obj_name` (capitalized)
89 * is not `NULL`.
90 */
91 #define BT_ASSERT_PRE_NON_NULL(_obj, _obj_name) \
92 BT_ASSERT_PRE((_obj), "%s is NULL: ", _obj_name)
93
94 /*
95 * Asserts that a given index `_index` is less than a given length
96 * `_length`.
97 */
98 #define BT_ASSERT_PRE_VALID_INDEX(_index, _length) \
99 BT_ASSERT_PRE((_index) < (_length), \
100 "Index is out of bounds: index=%" PRIu64 ", " \
101 "count=%" PRIu64, (uint64_t) (_index), (uint64_t) (_length))
102
103 /*
104 * Asserts that the current thread has no error set.
105 */
106 #define BT_ASSERT_PRE_NO_ERROR() \
107 do { \
108 const struct bt_error *err = bt_current_thread_take_error(); \
109 if (err) { \
110 bt_current_thread_move_error(err); \
111 } \
112 BT_ASSERT_PRE(!err, \
113 "API function called while current thread has an " \
114 "error: function=%s", __func__); \
115 } while (0)
116
117 #ifdef BT_DEV_MODE
118 /* Developer mode version of BT_ASSERT_PRE_MSG(). */
119 # define BT_ASSERT_PRE_DEV_MSG(_fmt, ...) \
120 BT_ASSERT_PRE_MSG(_fmt, ##__VA_ARGS__)
121
122 /* Developer mode version of BT_ASSERT_PRE(). */
123 # define BT_ASSERT_PRE_DEV(_cond, _fmt, ...) \
124 BT_ASSERT_PRE((_cond), _fmt, ##__VA_ARGS__)
125
126 /* Developer mode version of BT_ASSERT_PRE_NON_NULL() */
127 # define BT_ASSERT_PRE_DEV_NON_NULL(_obj, _obj_name) \
128 BT_ASSERT_PRE_NON_NULL((_obj), (_obj_name))
129
130 /*
131 * Developer mode: asserts that a given object `_obj` named `_obj_name`
132 * (capitalized) is NOT frozen. This macro checks the `frozen` field of
133 * `_obj`.
134 *
135 * This currently only exists in developer mode because some freezing
136 * functions can be called on the fast path, so they too are only
137 * enabled in developer mode.
138 */
139 # define BT_ASSERT_PRE_DEV_HOT(_obj, _obj_name, _fmt, ...) \
140 BT_ASSERT_PRE(!(_obj)->frozen, "%s is frozen" _fmt, _obj_name, \
141 ##__VA_ARGS__)
142
143 /* Developer mode version of BT_ASSERT_PRE_VALID_INDEX() */
144 # define BT_ASSERT_PRE_DEV_VALID_INDEX(_index, _length) \
145 BT_ASSERT_PRE_VALID_INDEX((_index), (_length))
146
147 /* Developer mode version of BT_ASSERT_PRE_NO_ERROR(). */
148 # define BT_ASSERT_PRE_DEV_NO_ERROR() \
149 BT_ASSERT_PRE_NO_ERROR()
150
151 /*
152 * Marks a function as being only used within a BT_ASSERT_PRE_DEV()
153 * context.
154 */
155 # define BT_ASSERT_PRE_DEV_FUNC
156 #else
157 # define BT_ASSERT_PRE_DEV_MSG(_fmt, ...)
158 # define BT_ASSERT_PRE_DEV(_cond, _fmt, ...) ((void) sizeof((void) (_cond), 0))
159 # define BT_ASSERT_PRE_DEV_NON_NULL(_obj, _obj_name) \
160 ((void) sizeof((void) (_obj), (void) (_obj_name), 0))
161 # define BT_ASSERT_PRE_DEV_HOT(_obj, _obj_name, _fmt, ...) \
162 ((void) sizeof((void) (_obj), (void) (_obj_name), 0))
163 # define BT_ASSERT_PRE_DEV_VALID_INDEX(_index, _length) \
164 ((void) sizeof((void) (_index), (void) (_length), 0))
165 # define BT_ASSERT_PRE_DEV_NO_ERROR()
166 # define BT_ASSERT_PRE_DEV_FUNC __attribute__((unused))
167 #endif /* BT_DEV_MODE */
168
169 #define BT_ASSERT_PRE_SUPPORTED
170
171 #endif /* BABELTRACE_ASSERT_PRE_INTERNAL_H */
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