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))
14 #define LTTNG_PACKED __attribute__((__packed__))
17 * Clang supports the no_sanitize variable attribute on global variables.
18 * GCC only supports the no_sanitize_address function attribute, which is
21 #if defined(__clang__)
22 # if __has_feature(address_sanitizer)
23 # define __lttng_ust_variable_attribute_no_sanitize_address \
24 __attribute__((no_sanitize("address")))
26 # define __lttng_ust_variable_attribute_no_sanitize_address
29 # define __lttng_ust_variable_attribute_no_sanitize_address
33 * g++ 4.8 and prior do not support C99 compound literals. Therefore,
34 * force allocating those on the heap with these C++ compilers.
36 #if defined (__cplusplus) && defined (__GNUC__) && \
37 (__GNUC__ < 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ <= 8))
38 # ifndef LTTNG_ALLOCATE_COMPOUND_LITERAL_ON_HEAP
39 # define LTTNG_ALLOCATE_COMPOUND_LITERAL_ON_HEAP
44 * Compound literals with static storage are needed by LTTng.
45 * Compound literals are part of the C99 and C11 standards, but not
46 * part of the C++ standards. However, those are supported by both g++ and
47 * clang. In order to be strictly C++11 compliant, defining
48 * LTTNG_ALLOCATE_COMPOUND_LITERAL_ON_HEAP before including this header
49 * allocates those on the heap in C++.
52 * static struct mystruct *var = __LTTNG_COMPOUND_LITERAL(struct mystruct, { 1, 2, 3 });
54 #if defined (__cplusplus) && defined (LTTNG_ALLOCATE_COMPOUND_LITERAL_ON_HEAP)
55 #define __LTTNG_COMPOUND_LITERAL(type, ...) new (type) __VA_ARGS__
57 #define __LTTNG_COMPOUND_LITERAL(type, ...) (type[]) { __VA_ARGS__ }
61 * Compile time assertion.
62 * - predicate: boolean expression to evaluate,
63 * - msg: string to print to the user on failure when `static_assert()` is
65 * - c_identifier_msg: message to be included in the typedef to emulate a
66 * static assertion. This parameter must be a valid C identifier as it will
67 * be used as a typedef name.
69 #if defined (__cplusplus) || __STDC_VERSION__ >= 201112L
70 #define lttng_static_assert(predicate, msg, c_identifier_msg) \
71 static_assert(predicate, msg)
74 * Evaluates the predicate and emit a compilation error on failure.
76 * If the predicate evaluates to true, this macro emits a typedef of an array
79 * If the predicate evaluates to false, this macro emits a typedef of an array
80 * of negative size which is invalid in C and forces a compiler error. The msg
81 * parameter is used in the tentative typedef so it is printed to the user.
83 #define lttng_static_assert(predicate, msg, c_identifier_msg) \
84 typedef char lttng_static_assert_##c_identifier_msg[2*!!(predicate)-1];
87 #endif /* _LTTNG_UST_COMPILER_H */
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