83 lines
2.9 KiB
C
83 lines
2.9 KiB
C
/*
|
|
* Copyright (C) 2018 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
// Various macros related to function inlining.
|
|
|
|
#ifndef NLP_SAFT_COMPONENTS_COMMON_MOBILE_LITE_BASE_ATTRIBUTES_H_
|
|
#define NLP_SAFT_COMPONENTS_COMMON_MOBILE_LITE_BASE_ATTRIBUTES_H_
|
|
|
|
// SAFTM_HAVE_ATTRIBUTE
|
|
//
|
|
// A function-like feature checking macro that is a wrapper around
|
|
// `__has_attribute`, which is defined by GCC 5+ and Clang and evaluates to a
|
|
// nonzero constant integer if the attribute is supported or 0 if not.
|
|
//
|
|
// It evaluates to zero if `__has_attribute` is not defined by the compiler.
|
|
//
|
|
// GCC: https://gcc.gnu.org/gcc-5/changes.html
|
|
// Clang: https://clang.llvm.org/docs/LanguageExtensions.html
|
|
#ifdef __has_attribute
|
|
#define SAFTM_HAVE_ATTRIBUTE(x) __has_attribute(x)
|
|
#else
|
|
#define SAFTM_HAVE_ATTRIBUTE(x) 0
|
|
#endif
|
|
|
|
// SAFTM_MUST_USE_RESULT
|
|
//
|
|
// Tells the compiler to warn about unused return values for functions declared
|
|
// with this macro. The macro must appear as the very first part of a function
|
|
// declaration or definition:
|
|
//
|
|
// Example:
|
|
//
|
|
// SAFTM_MUST_USE_RESULT Sprocket* AllocateSprocket();
|
|
//
|
|
// This placement has the broadest compatibility with GCC, Clang, and MSVC, with
|
|
// both defs and decls, and with GCC-style attributes, MSVC declspec, C++11
|
|
// and C++17 attributes.
|
|
//
|
|
// SAFTM_MUST_USE_RESULT allows using cast-to-void to suppress the unused result
|
|
// warning. For that, warn_unused_result is used only for clang but not for gcc.
|
|
// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66425
|
|
#if SAFTM_HAVE_ATTRIBUTE(nodiscard)
|
|
#define SAFTM_MUST_USE_RESULT [[nodiscard]]
|
|
#elif defined(__clang__) && SAFTM_HAVE_ATTRIBUTE(warn_unused_result)
|
|
#define SAFTM_MUST_USE_RESULT __attribute__((warn_unused_result))
|
|
#else
|
|
#define SAFTM_MUST_USE_RESULT
|
|
#endif
|
|
|
|
#if defined(__GNUC__) && \
|
|
(__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1))
|
|
|
|
// For functions we want to force inline.
|
|
// Introduced in gcc 3.1.
|
|
#define SAFTM_ATTRIBUTE_ALWAYS_INLINE __attribute__((always_inline))
|
|
|
|
// For functions we don't want to inline, e.g., to keep code size small.
|
|
#define SAFTM_ATTRIBUTE_NOINLINE __attribute__((noinline))
|
|
|
|
#elif defined(_MSC_VER)
|
|
#define SAFTM_ATTRIBUTE_ALWAYS_INLINE __forceinline
|
|
#else
|
|
|
|
// Other compilers will have to figure it out for themselves.
|
|
#define SAFTM_ATTRIBUTE_ALWAYS_INLINE
|
|
#define SAFTM_ATTRIBUTE_NOINLINE
|
|
#endif // big condition on two lines.
|
|
|
|
#endif // NLP_SAFT_COMPONENTS_COMMON_MOBILE_LITE_BASE_ATTRIBUTES_H_
|