2 * Copyright 2017 Facebook, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
19 /* These definitions are in a separate file so that they
20 * may be included from C- as well as C++-based projects. */
23 * Portable version check.
26 # if defined __GNUC__ && defined __GNUC_MINOR__
28 # define __GNUC_PREREQ(maj, min) ((__GNUC__ << 16) + __GNUC_MINOR__ >= \
29 ((maj) << 16) + (min))
32 # define __GNUC_PREREQ(maj, min) 0
36 // portable version check for clang
37 #ifndef __CLANG_PREREQ
38 # if defined __clang__ && defined __clang_major__ && defined __clang_minor__
40 # define __CLANG_PREREQ(maj, min) \
41 ((__clang_major__ << 16) + __clang_minor__ >= ((maj) << 16) + (min))
44 # define __CLANG_PREREQ(maj, min) 0
48 /* Define a convenience macro to test when address sanitizer is being used
49 * across the different compilers (e.g. clang, gcc) */
50 #if defined(__clang__)
51 # if __has_feature(address_sanitizer)
52 # define FOLLY_SANITIZE_ADDRESS 1
54 #elif defined (__GNUC__) && \
55 (((__GNUC__ == 4) && (__GNUC_MINOR__ >= 8)) || (__GNUC__ >= 5)) && \
57 # define FOLLY_SANITIZE_ADDRESS 1
60 /* Define attribute wrapper for function attribute used to disable
61 * address sanitizer instrumentation. Unfortunately, this attribute
62 * has issues when inlining is used, so disable that as well. */
63 #ifdef FOLLY_SANITIZE_ADDRESS
64 # if defined(__clang__)
65 # if __has_attribute(__no_sanitize__)
66 # define FOLLY_DISABLE_ADDRESS_SANITIZER \
67 __attribute__((__no_sanitize__("address"), __noinline__))
68 # elif __has_attribute(__no_address_safety_analysis__)
69 # define FOLLY_DISABLE_ADDRESS_SANITIZER \
70 __attribute__((__no_address_safety_analysis__, __noinline__))
71 # elif __has_attribute(__no_sanitize_address__)
72 # define FOLLY_DISABLE_ADDRESS_SANITIZER \
73 __attribute__((__no_sanitize_address__, __noinline__))
75 # elif defined(__GNUC__)
76 # define FOLLY_DISABLE_ADDRESS_SANITIZER \
77 __attribute__((__no_address_safety_analysis__, __noinline__))
80 #ifndef FOLLY_DISABLE_ADDRESS_SANITIZER
81 # define FOLLY_DISABLE_ADDRESS_SANITIZER
84 /* Define a convenience macro to test when thread sanitizer is being used
85 * across the different compilers (e.g. clang, gcc) */
86 #if defined(__clang__)
87 # if __has_feature(thread_sanitizer)
88 # define FOLLY_SANITIZE_THREAD 1
90 #elif defined(__GNUC__) && __SANITIZE_THREAD__
91 # define FOLLY_SANITIZE_THREAD 1
95 * ASAN/MSAN/TSAN define pre-processor symbols:
96 * ADDRESS_SANITIZER/MEMORY_SANITIZER/THREAD_SANITIZER.
98 * UBSAN doesn't define anything and makes it hard to
99 * conditionally compile.
101 * The build system should define UNDEFINED_SANITIZER=1 when UBSAN is
102 * used as folly whitelists some functions.
104 #if UNDEFINED_SANITIZER
105 #define FOLLY_DISABLE_UNDEFINED_BEHAVIOR_SANITIZER(...) \
106 __attribute__((no_sanitize(__VA_ARGS__)))
108 #define FOLLY_DISABLE_UNDEFINED_BEHAVIOR_SANITIZER(...)
109 #endif // UNDEFINED_SANITIZER
112 * Macro for marking functions as having public visibility.
114 #if defined(__GNUC__)
115 # if __GNUC_PREREQ(4, 9)
116 # define FOLLY_EXPORT [[gnu::visibility("default")]]
118 # define FOLLY_EXPORT __attribute__((__visibility__("default")))
121 # define FOLLY_EXPORT
126 # define FOLLY_NOINLINE __declspec(noinline)
127 #elif defined(__clang__) || defined(__GNUC__)
128 # define FOLLY_NOINLINE __attribute__((__noinline__))
130 # define FOLLY_NOINLINE
135 # define FOLLY_ALWAYS_INLINE __forceinline
136 #elif defined(__clang__) || defined(__GNUC__)
137 # define FOLLY_ALWAYS_INLINE inline __attribute__((__always_inline__))
139 # define FOLLY_ALWAYS_INLINE inline
144 #define FOLLY_ATTR_VISIBILITY_HIDDEN
145 #elif defined(__clang__) || defined(__GNUC__)
146 #define FOLLY_ATTR_VISIBILITY_HIDDEN __attribute__((__visibility__("hidden")))
148 #define FOLLY_ATTR_VISIBILITY_HIDDEN