78 lines
3.9 KiB
C
78 lines
3.9 KiB
C
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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// The `annotate` attribute always pulls the annotated (inline) function into the object files, thus
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// we should only annotate headers when we are running versioner.
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#if defined(__BIONIC_VERSIONER)
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#define __INTRODUCED_IN(api_level) __attribute__((annotate("introduced_in=" #api_level)))
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#define __INTRODUCED_IN_NO_GUARD_FOR_NDK(api_level) __attribute__((annotate("introduced_in=" #api_level))) __VERSIONER_NO_GUARD
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#define __DEPRECATED_IN(api_level) __attribute__((annotate("deprecated_in=" #api_level)))
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#define __REMOVED_IN(api_level) __attribute__((annotate("obsoleted_in=" #api_level)))
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#define __INTRODUCED_IN_32(api_level) __attribute__((annotate("introduced_in_32=" #api_level)))
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#define __INTRODUCED_IN_64(api_level) __attribute__((annotate("introduced_in_64=" #api_level)))
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#define __VERSIONER_NO_GUARD __attribute__((annotate("versioner_no_guard")))
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#define __VERSIONER_FORTIFY_INLINE __attribute__((annotate("versioner_fortify_inline")))
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#else
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// When headers are not processed by the versioner (i.e. compiled into object files),
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// the availability attributed is emitted instead. The clang compiler will make the symbol weak
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// when targeting old api_level and enforce the reference to the symbol to be guarded with
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// __builtin_available(android api_level, *).
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// The 'strict' flag is required for NDK clients where the use of "-Wunguarded-availability" cannot
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// be enforced. In the case, the absence of 'strict' makes it possible to call an unavailable API
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// without the __builtin_available check, which will cause a link error at runtime.
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// Android platform build system defines this macro along with -Wunguarded-availability
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//
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// The _NO_GUARD_FOR_NDK variants keep the __VERSIONER_NO_GUARD behavior working for the NDK. This
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// allows libc++ to refer to these functions in inlines without needing to guard them, needed since
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// libc++ doesn't currently guard these calls. There's no risk to the apps though because using
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// those APIs will still cause a link error.
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#if defined(__ANDROID_UNAVAILABLE_SYMBOLS_ARE_WEAK__)
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#define __BIONIC_AVAILABILITY(__what) __attribute__((__availability__(android,__what)))
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#define __INTRODUCED_IN_NO_GUARD_FOR_NDK(api_level) __INTRODUCED_IN(api_level)
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#else
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#define __BIONIC_AVAILABILITY(__what) __attribute__((__availability__(android,strict,__what)))
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#define __INTRODUCED_IN_NO_GUARD_FOR_NDK(api_level)
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#endif
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#define __INTRODUCED_IN(api_level) __BIONIC_AVAILABILITY(introduced=api_level)
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#define __DEPRECATED_IN(api_level) __BIONIC_AVAILABILITY(deprecated=api_level)
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#define __REMOVED_IN(api_level) __BIONIC_AVAILABILITY(obsoleted=api_level)
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// The same availability attribute can't be annotated multiple times. Therefore, the macros are
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// defined for the configuration that it is valid for so that declarations like the below doesn't
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// cause inconsistent availability values which is an error with -Wavailability:
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//
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// void foo() __INTRODUCED_IN_32(30) __INTRODUCED_IN_64(31);
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//
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#if !defined(__LP64__)
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#define __INTRODUCED_IN_32(api_level) __BIONIC_AVAILABILITY(introduced=api_level)
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#define __INTRODUCED_IN_64(api_level)
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#else
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#define __INTRODUCED_IN_32(api_level)
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#define __INTRODUCED_IN_64(api_level) __BIONIC_AVAILABILITY(introduced=api_level)
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#endif
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#define __VERSIONER_NO_GUARD
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#define __VERSIONER_FORTIFY_INLINE
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#endif // defined(__BIONIC_VERSIONER)
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