2 * SPDX-License-Identifier: MIT
4 * Copyright 2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
7 #ifndef _BABELTRACE_INTERNAL_H
8 #define _BABELTRACE_INTERNAL_H
15 #define BT_EXTERN_C extern "C"
20 #define bt_max_t(type, a, b) \
21 ((type) (a) > (type) (b) ? (type) (a) : (type) (b))
24 * BT_EXPORT: set the visibility for exported functions.
26 #if defined(_WIN32) || defined(__CYGWIN__)
29 #define BT_EXPORT __attribute__((visibility("default")))
33 * BT_NOEXCEPT: defined to `noexcept` if compiling as C++, else empty.
35 #if defined(__cplusplus)
36 #define BT_NOEXCEPT noexcept
41 /* Enable `txt` if developer mode is enabled. */
43 #define BT_IF_DEV_MODE(txt) txt
45 #define BT_IF_DEV_MODE(txt)
49 * Yield `ref`'s value while setting `ref` to NULL.
51 * This can be used to give a strong reference to a callee:
53 * add_foo_to_list(list, BT_MOVE_REF(foo));
55 * or in a simple assignment:
57 * my_struct->foo = BT_MOVE_REF(foo);
59 * When moving a reference in a function call, the reference is given to the
60 * callee even if that function call fails, so make sure the called function
61 * is written accordingly.
64 #define BT_MOVE_REF(ref) \
66 __typeof__(ref) _ref = ref; \
71 /* Wrapper for g_array_index that adds bound checking. */
72 #define bt_g_array_index(a, t, i) \
73 g_array_index((a), t, ({ BT_ASSERT_DBG((i) < (a)->len); (i); }))
77 * <https://stackoverflow.com/questions/37411809/how-to-elegantly-fix-this-unused-variable-warning/37412551#37412551>:
79 * * sizeof() ensures that the expression is not evaluated at all, so
80 * its side-effects don't happen. That is to be consistent with the
81 * usual behaviour of debug-only constructs, such as assert().
83 * * `((_expr), 0)` uses the comma operator to swallow the actual type
84 * of `(_expr)`. This is to prevent VLAs from triggering evaluation.
86 * * `(void)` explicitly ignores the result of `(_expr)` and sizeof() so
87 * no "unused value" warning appears.
90 #define BT_USE_EXPR(_expr) ((void) sizeof((void) (_expr), 0))
91 #define BT_USE_EXPR2(_expr1, _expr2) \
92 ((void) sizeof((void) (_expr1), (void) (_expr2), 0))
93 #define BT_USE_EXPR3(_expr1, _expr2, _expr3) \
94 ((void) sizeof((void) (_expr1), (void) (_expr2), (void) (_expr3), 0))
95 #define BT_USE_EXPR4(_expr1, _expr2, _expr3, _expr4) \
96 ((void) sizeof((void) (_expr1), (void) (_expr2), \
97 (void) (_expr3), (void) (_expr4), 0))
98 #define BT_USE_EXPR5(_expr1, _expr2, _expr3, _expr4, _expr5) \
99 ((void) sizeof((void) (_expr1), (void) (_expr2), \
100 (void) (_expr3), (void) (_expr4), (void) (_expr5), 0))
102 #if defined __clang__
103 # if __has_warning("-Wunused-but-set-variable")
104 # define BT_DIAG_IGNORE_UNUSED_BUT_SET_VARIABLE \
105 _Pragma("GCC diagnostic ignored \"-Wunused-but-set-variable\"")
109 #if !defined BT_DIAG_IGNORE_UNUSED_BUT_SET_VARIABLE
110 # define BT_DIAG_IGNORE_UNUSED_BUT_SET_VARIABLE
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