Provide new GCC builtin __builtin_counted_by_ref [PR116016]
[official-gcc.git] / libstdc++-v3 / config / cpu / arm / cxxabi_tweaks.h
blobfb6b9622a998e39aaf69939a76ce25b24cd884ad
1 // Control various target specific ABI tweaks. ARM version.
3 // Copyright (C) 2004-2024 Free Software Foundation, Inc.
4 //
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
9 // any later version.
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
25 /** @file bits/cxxabi_tweaks.h
26 * This is an internal header file, included by other library headers.
27 * Do not attempt to use it directly. @headername{cxxabi.h}
30 #ifndef _CXXABI_TWEAKS_H
31 #define _CXXABI_TWEAKS_H 1
33 #ifdef __cplusplus
34 namespace __cxxabiv1
36 extern "C"
38 #endif
40 #ifdef __ARM_EABI__
41 // The ARM EABI uses the least significant bit of a 32-bit
42 // guard variable.
43 #define _GLIBCXX_GUARD_TEST(x) ((*(x) & 1) != 0)
44 #define _GLIBCXX_GUARD_SET(x) *(x) = 1
45 #define _GLIBCXX_GUARD_BIT 1
46 #define _GLIBCXX_GUARD_PENDING_BIT __guard_test_bit (1, 1)
47 #define _GLIBCXX_GUARD_WAITING_BIT __guard_test_bit (2, 1)
48 typedef int __guard;
50 #define _GLIBCXX_GUARD_TEST_AND_ACQUIRE(x) \
51 ((__atomic_load_n(x, __ATOMIC_ACQUIRE) & 1) != 0)
52 #define _GLIBCXX_GUARD_SET_AND_RELEASE(x) \
53 __atomic_store_n(x, 1, __ATOMIC_RELEASE)
55 // We also want the element size in array cookies.
56 #define _GLIBCXX_ELTSIZE_IN_COOKIE 1
58 // __cxa_vec_ctor should return a pointer to the array.
59 typedef void * __cxa_vec_ctor_return_type;
60 #define _GLIBCXX_CXA_VEC_CTOR_RETURN(x) return x
61 // Constructors and destructors return the "this" pointer.
62 typedef void * __cxa_cdtor_return_type;
64 #else // __ARM_EABI__
66 // The generic ABI uses the first byte of a 64-bit guard variable.
67 #define _GLIBCXX_GUARD_TEST(x) (*(char *) (x) != 0)
68 #define _GLIBCXX_GUARD_SET(x) *(char *) (x) = 1
69 #define _GLIBCXX_GUARD_BIT __guard_test_bit (0, 1)
70 #define _GLIBCXX_GUARD_PENDING_BIT __guard_test_bit (1, 1)
71 #define _GLIBCXX_GUARD_WAITING_BIT __guard_test_bit (2, 1)
72 __extension__ typedef int __guard __attribute__((mode (__DI__)));
74 // __cxa_vec_ctor has void return type.
75 typedef void __cxa_vec_ctor_return_type;
76 #define _GLIBCXX_CXA_VEC_CTOR_RETURN(x) return
77 // Constructors and destructors do not return a value.
78 typedef void __cxa_cdtor_return_type;
80 #endif //!__ARM_EABI__
82 #ifdef __cplusplus
84 } // namespace __cxxabiv1
85 #endif
87 #endif