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a8909ba5 PW |
1 | #ifndef _LTTNG_UST_COMPILER_H |
2 | #define _LTTNG_UST_COMPILER_H | |
3 | ||
4 | /* | |
5 | * Copyright 2011-2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
6 | * Paul Woegerer <paul_woegerer@mentor.com> | |
7 | * | |
8 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
9 | * of this software and associated documentation files (the "Software"), to deal | |
10 | * in the Software without restriction, including without limitation the rights | |
11 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
12 | * copies of the Software, and to permit persons to whom the Software is | |
13 | * furnished to do so, subject to the following conditions: | |
14 | * | |
15 | * The above copyright notice and this permission notice shall be included in | |
16 | * all copies or substantial portions of the Software. | |
d2428e87 MD |
17 | * |
18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
20 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
21 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
22 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
23 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
24 | * SOFTWARE. | |
a8909ba5 PW |
25 | */ |
26 | ||
7f264068 FD |
27 | #include <assert.h> |
28 | ||
a8909ba5 | 29 | #define lttng_ust_notrace __attribute__((no_instrument_function)) |
b3f60bbf | 30 | #define LTTNG_PACKED __attribute__((__packed__)) |
a8909ba5 | 31 | |
4f74bc5e MD |
32 | /* |
33 | * Clang supports the no_sanitize variable attribute on global variables. | |
34 | * GCC only supports the no_sanitize_address function attribute, which is | |
35 | * not what we need. | |
36 | */ | |
37 | #if defined(__clang__) | |
38 | # if __has_feature(address_sanitizer) | |
39 | # define __lttng_ust_variable_attribute_no_sanitize_address \ | |
40 | __attribute__((no_sanitize("address"))) | |
41 | # else | |
42 | # define __lttng_ust_variable_attribute_no_sanitize_address | |
43 | # endif | |
44 | #else | |
45 | # define __lttng_ust_variable_attribute_no_sanitize_address | |
46 | #endif | |
47 | ||
e1904921 MD |
48 | /* |
49 | * g++ 4.8 and prior do not support C99 compound literals. Therefore, | |
50 | * force allocating those on the heap with these C++ compilers. | |
51 | */ | |
52 | #if defined (__cplusplus) && defined (__GNUC__) && \ | |
53 | (__GNUC__ < 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ <= 8)) | |
54 | # ifndef LTTNG_ALLOCATE_COMPOUND_LITERAL_ON_HEAP | |
55 | # define LTTNG_ALLOCATE_COMPOUND_LITERAL_ON_HEAP | |
56 | # endif | |
57 | #endif | |
58 | ||
7edfc172 MD |
59 | /* |
60 | * Compound literals with static storage are needed by LTTng. | |
61 | * Compound literals are part of the C99 and C11 standards, but not | |
62 | * part of the C++ standards. However, those are supported by both g++ and | |
63 | * clang. In order to be strictly C++11 compliant, defining | |
64 | * LTTNG_ALLOCATE_COMPOUND_LITERAL_ON_HEAP before including this header | |
65 | * allocates those on the heap in C++. | |
66 | * | |
67 | * Example use: | |
68 | * static struct mystruct *var = __LTTNG_COMPOUND_LITERAL(struct mystruct, { 1, 2, 3 }); | |
69 | */ | |
70 | #if defined (__cplusplus) && defined (LTTNG_ALLOCATE_COMPOUND_LITERAL_ON_HEAP) | |
71 | #define __LTTNG_COMPOUND_LITERAL(type, ...) new (type) __VA_ARGS__ | |
72 | #else | |
73 | #define __LTTNG_COMPOUND_LITERAL(type, ...) (type[]) { __VA_ARGS__ } | |
74 | #endif | |
75 | ||
7f264068 FD |
76 | /* |
77 | * Compile time assertion. | |
78 | * - predicate: boolean expression to evaluate, | |
79 | * - msg: string to print to the user on failure when `static_assert()` is | |
80 | * supported, | |
81 | * - c_identifier_msg: message to be included in the typedef to emulate a | |
82 | * static assertion. This parameter must be a valid C identifier as it will | |
83 | * be used as a typedef name. | |
84 | */ | |
85 | #if defined (__cplusplus) || __STDC_VERSION__ >= 201112L | |
86 | #define lttng_static_assert(predicate, msg, c_identifier_msg) \ | |
87 | static_assert(predicate, msg) | |
88 | #else | |
89 | /* | |
90 | * Evaluates the predicate and emit a compilation error on failure. | |
91 | * | |
92 | * If the predicate evaluates to true, this macro emits a typedef of an array | |
93 | * of size 0. | |
94 | * | |
95 | * If the predicate evaluates to false, this macro emits a typedef of an array | |
96 | * of negative size which is invalid in C and forces a compiler error. The msg | |
97 | * parameter is used in the tentative typedef so it is printed to the user. | |
98 | */ | |
99 | #define lttng_static_assert(predicate, msg, c_identifier_msg) \ | |
100 | typedef char lttng_static_assert_##c_identifier_msg[2*!!(predicate)-1]; | |
101 | #endif | |
102 | ||
a8909ba5 | 103 | #endif /* _LTTNG_UST_COMPILER_H */ |