026ca1121c
libstdc++-v3/ChangeLog: * config/cpu/arm/cxxabi_tweaks.h (_GLIBCXX_GUARD_TEST_AND_ACQUIRE): Do not try to dereference return value of __atomic_load_n.
88 lines
3.0 KiB
C++
88 lines
3.0 KiB
C++
// Control various target specific ABI tweaks. ARM version.
|
|
|
|
// Copyright (C) 2004-2020 Free Software Foundation, Inc.
|
|
//
|
|
// This file is part of the GNU ISO C++ Library. This library is free
|
|
// software; you can redistribute it and/or modify it under the
|
|
// terms of the GNU General Public License as published by the
|
|
// Free Software Foundation; either version 3, or (at your option)
|
|
// any later version.
|
|
|
|
// This library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
|
|
// Under Section 7 of GPL version 3, you are granted additional
|
|
// permissions described in the GCC Runtime Library Exception, version
|
|
// 3.1, as published by the Free Software Foundation.
|
|
|
|
// You should have received a copy of the GNU General Public License and
|
|
// a copy of the GCC Runtime Library Exception along with this program;
|
|
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
// <http://www.gnu.org/licenses/>.
|
|
|
|
/** @file bits/cxxabi_tweaks.h
|
|
* This is an internal header file, included by other library headers.
|
|
* Do not attempt to use it directly. @headername{cxxabi.h}
|
|
*/
|
|
|
|
#ifndef _CXXABI_TWEAKS_H
|
|
#define _CXXABI_TWEAKS_H 1
|
|
|
|
#ifdef __cplusplus
|
|
namespace __cxxabiv1
|
|
{
|
|
extern "C"
|
|
{
|
|
#endif
|
|
|
|
#ifdef __ARM_EABI__
|
|
// The ARM EABI uses the least significant bit of a 32-bit
|
|
// guard variable.
|
|
#define _GLIBCXX_GUARD_TEST(x) ((*(x) & 1) != 0)
|
|
#define _GLIBCXX_GUARD_SET(x) *(x) = 1
|
|
#define _GLIBCXX_GUARD_BIT 1
|
|
#define _GLIBCXX_GUARD_PENDING_BIT __guard_test_bit (1, 1)
|
|
#define _GLIBCXX_GUARD_WAITING_BIT __guard_test_bit (2, 1)
|
|
typedef int __guard;
|
|
|
|
#define _GLIBCXX_GUARD_TEST_AND_ACQUIRE(x) \
|
|
((__atomic_load_n(x, __ATOMIC_ACQUIRE) & 1) != 0)
|
|
#define _GLIBCXX_GUARD_SET_AND_RELEASE(x) \
|
|
__atomic_store_n(x, 1, __ATOMIC_RELEASE)
|
|
|
|
// We also want the element size in array cookies.
|
|
#define _GLIBCXX_ELTSIZE_IN_COOKIE 1
|
|
|
|
// __cxa_vec_ctor should return a pointer to the array.
|
|
typedef void * __cxa_vec_ctor_return_type;
|
|
#define _GLIBCXX_CXA_VEC_CTOR_RETURN(x) return x
|
|
// Constructors and destructors return the "this" pointer.
|
|
typedef void * __cxa_cdtor_return_type;
|
|
|
|
#else // __ARM_EABI__
|
|
|
|
// The generic ABI uses the first byte of a 64-bit guard variable.
|
|
#define _GLIBCXX_GUARD_TEST(x) (*(char *) (x) != 0)
|
|
#define _GLIBCXX_GUARD_SET(x) *(char *) (x) = 1
|
|
#define _GLIBCXX_GUARD_BIT __guard_test_bit (0, 1)
|
|
#define _GLIBCXX_GUARD_PENDING_BIT __guard_test_bit (1, 1)
|
|
#define _GLIBCXX_GUARD_WAITING_BIT __guard_test_bit (2, 1)
|
|
__extension__ typedef int __guard __attribute__((mode (__DI__)));
|
|
|
|
// __cxa_vec_ctor has void return type.
|
|
typedef void __cxa_vec_ctor_return_type;
|
|
#define _GLIBCXX_CXA_VEC_CTOR_RETURN(x) return
|
|
// Constructors and destructors do not return a value.
|
|
typedef void __cxa_cdtor_return_type;
|
|
|
|
#endif //!__ARM_EABI__
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
} // namespace __cxxabiv1
|
|
#endif
|
|
|
|
#endif
|