nuttx/libs/libxx/libcxxmini/libxx_cxa_guard.cxx
Xiang Xiao c8b93ed45e libxx: Move the partial c++ abi implementation to libcxxmini sub folder
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
Change-Id: I2bc9b8be2962451a44352ab90623c9481bd162b2
2021-08-31 06:52:10 -03:00

109 lines
4.0 KiB
C++

//***************************************************************************
// libs/libxx/libcxxmini/libxx_cxa_guard.cxx
//
// Copyright (C) 2015 Omni Hoverboards Inc. All rights reserved.
// Author: Paul Alexander Patience <paul-a.patience@polymtl.ca>
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in
// the documentation and/or other materials provided with the
// distribution.
// 3. Neither the name NuttX nor the names of its contributors may be
// used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
// OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
// AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
//***************************************************************************
//***************************************************************************
// Included Files
//***************************************************************************
#include <nuttx/compiler.h>
//***************************************************************************
// Pre-processor Definitions
//***************************************************************************
//***************************************************************************
// Private Types
//***************************************************************************
#ifdef __ARM_EABI__
// The 32-bit ARM C++ ABI specifies that the guard is a 32-bit
// variable and the least significant bit contains 0 prior to
// initialization, and 1 after.
typedef int __guard;
#else
// The "standard" C++ ABI specifies that the guard is a 64-bit
// variable and the first byte contains 0 prior to initialization, and
// 1 after.
__extension__ typedef int __guard __attribute__((mode(__DI__)));
#endif
//***************************************************************************
// Private Data
//***************************************************************************
//***************************************************************************
// Public Functions
//***************************************************************************
extern "C"
{
//*************************************************************************
// Name: __cxa_guard_acquire
//*************************************************************************
int __cxa_guard_acquire(FAR __guard *g)
{
#ifdef __ARM_EABI__
return !(*g & 1);
#else
return !*(char *)g;
#endif
}
//*************************************************************************
// Name: __cxa_guard_release
//*************************************************************************
void __cxa_guard_release(FAR __guard *g)
{
#ifdef __ARM_EABI__
*g = 1;
#else
*(char *)g = 1;
#endif
}
//*************************************************************************
// Name: __cxa_guard_abort
//*************************************************************************
void __cxa_guard_abort(FAR __guard *)
{
}
}