libstdc++-v3/config/cpu/arm/cxxabi_tweaks.h

   1 // Control various target specific ABI tweaks.  ARM version.
   2
   3 // Copyright (C) 2004-2017 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.
  10
  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.
  15
  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.
  19
  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/>.
  24
  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}
  28  */
  29
  30 #ifndef _CXXABI_TWEAKS_H
  31 #define _CXXABI_TWEAKS_H 1
  32
  33 #ifdef __cplusplus
  34 namespace __cxxabiv1
  35 {
  36   extern "C"
  37   {
  38 #endif
  39
  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;
  49
  50   // We also want the element size in array cookies.
  51 #define _GLIBCXX_ELTSIZE_IN_COOKIE 1
  52
  53   // __cxa_vec_ctor should return a pointer to the array.
  54   typedef void * __cxa_vec_ctor_return_type;
  55 #define _GLIBCXX_CXA_VEC_CTOR_RETURN(x) return x
  56   // Constructors and destructors return the "this" pointer.
  57   typedef void * __cxa_cdtor_return_type;
  58
  59 #else // __ARM_EABI__
  60
  61   // The generic ABI uses the first byte of a 64-bit guard variable.
  62 #define _GLIBCXX_GUARD_TEST(x) (*(char *) (x) != 0)
  63 #define _GLIBCXX_GUARD_SET(x) *(char *) (x) = 1
  64 #define _GLIBCXX_GUARD_BIT __guard_test_bit (0, 1)
  65 #define _GLIBCXX_GUARD_PENDING_BIT __guard_test_bit (1, 1)
  66 #define _GLIBCXX_GUARD_WAITING_BIT __guard_test_bit (2, 1)
  67   __extension__ typedef int __guard __attribute__((mode (__DI__)));
  68
  69   // __cxa_vec_ctor has void return type.
  70   typedef void __cxa_vec_ctor_return_type;
  71 #define _GLIBCXX_CXA_VEC_CTOR_RETURN(x) return
  72   // Constructors and destructors do not return a value.
  73   typedef void __cxa_cdtor_return_type;
  74
  75 #endif //!__ARM_EABI__
  76
  77 #ifdef __cplusplus
  78   }
  79 } // namespace __cxxabiv1
  80 #endif
  81
  82 #endif