2 * SPDX-License-Identifier: MIT
4 * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 * Copyright (C) 2011-2012 Paul Woegerer <paul_woegerer@mentor.com>
8 #ifndef _LTTNG_UST_COMPILER_H
9 #define _LTTNG_UST_COMPILER_H
13 #define lttng_ust_notrace __attribute__((no_instrument_function))
16 * Clang supports the no_sanitize variable attribute on global variables.
17 * GCC only supports the no_sanitize_address function attribute, which is
20 #if defined(__clang__)
21 # if __has_feature(address_sanitizer)
22 # define __lttng_ust_variable_attribute_no_sanitize_address \
23 __attribute__((no_sanitize("address")))
25 # define __lttng_ust_variable_attribute_no_sanitize_address
28 # define __lttng_ust_variable_attribute_no_sanitize_address
32 * g++ 4.8 and prior do not support C99 compound literals. Therefore,
33 * force allocating those on the heap with these C++ compilers.
35 #if defined (__cplusplus) && defined (__GNUC__) && \
36 (__GNUC__ < 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ <= 8))
37 # ifndef LTTNG_ALLOCATE_COMPOUND_LITERAL_ON_HEAP
38 # define LTTNG_ALLOCATE_COMPOUND_LITERAL_ON_HEAP
43 * Compound literals with static storage are needed by LTTng.
44 * Compound literals are part of the C99 and C11 standards, but not
45 * part of the C++ standards. However, those are supported by both g++ and
46 * clang. In order to be strictly C++11 compliant, defining
47 * LTTNG_ALLOCATE_COMPOUND_LITERAL_ON_HEAP before including this header
48 * allocates those on the heap in C++.
51 * static struct mystruct *var = __LTTNG_COMPOUND_LITERAL(struct mystruct, { 1, 2, 3 });
53 #if defined (__cplusplus) && defined (LTTNG_ALLOCATE_COMPOUND_LITERAL_ON_HEAP)
54 #define __LTTNG_COMPOUND_LITERAL(type, ...) new (type) __VA_ARGS__
56 #define __LTTNG_COMPOUND_LITERAL(type, ...) (type[]) { __VA_ARGS__ }
60 * Compile time assertion.
61 * - predicate: boolean expression to evaluate,
62 * - msg: string to print to the user on failure when `static_assert()` is
64 * - c_identifier_msg: message to be included in the typedef to emulate a
65 * static assertion. This parameter must be a valid C identifier as it will
66 * be used as a typedef name.
68 #if defined (__cplusplus) || __STDC_VERSION__ >= 201112L
69 #define lttng_static_assert(predicate, msg, c_identifier_msg) \
70 static_assert(predicate, msg)
73 * Evaluates the predicate and emit a compilation error on failure.
75 * If the predicate evaluates to true, this macro emits a typedef of an array
78 * If the predicate evaluates to false, this macro emits a typedef of an array
79 * of negative size which is invalid in C and forces a compiler error. The msg
80 * parameter is used in the tentative typedef so it is printed to the user.
82 #define lttng_static_assert(predicate, msg, c_identifier_msg) \
83 typedef char lttng_static_assert_##c_identifier_msg[2*!!(predicate)-1];
86 #endif /* _LTTNG_UST_COMPILER_H */
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