github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/vdso/compiler.h (about)

     1  // Copyright 2018 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  #ifndef VDSO_COMPILER_H_
    16  #define VDSO_COMPILER_H_
    17  
    18  #define likely(x) __builtin_expect(!!(x), 1)
    19  #define unlikely(x) __builtin_expect(!!(x), 0)
    20  
    21  #ifndef __section
    22  #define __section(S) __attribute__((__section__(#S)))
    23  #endif
    24  
    25  #ifndef __aligned
    26  #define __aligned(N) __attribute__((__aligned__(N)))
    27  #endif
    28  
    29  #endif  // VDSO_COMPILER_H_