libstdc++
cxxabi_tweaks.h
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00001 // Control various target specific ABI tweaks.  ARM version.
00002 
00003 // Copyright (C) 2004, 2006, 2008, 2009, 2011 Free Software Foundation, Inc.
00004 //
00005 // This file is part of the GNU ISO C++ Library.  This library is free
00006 // software; you can redistribute it and/or modify it under the
00007 // terms of the GNU General Public License as published by the
00008 // Free Software Foundation; either version 3, or (at your option)
00009 // any later version.
00010 
00011 // This library is distributed in the hope that it will be useful,
00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 // GNU General Public License for more details.
00015 
00016 // Under Section 7 of GPL version 3, you are granted additional
00017 // permissions described in the GCC Runtime Library Exception, version
00018 // 3.1, as published by the Free Software Foundation.
00019 
00020 // You should have received a copy of the GNU General Public License and
00021 // a copy of the GCC Runtime Library Exception along with this program;
00022 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
00023 // <http://www.gnu.org/licenses/>.
00024 
00025 /** @file bits/cxxabi_tweaks.h
00026  *  This is an internal header file, included by other library headers.
00027  *  Do not attempt to use it directly. @headername{cxxabi.h}
00028  */
00029 
00030 #ifndef _CXXABI_TWEAKS_H
00031 #define _CXXABI_TWEAKS_H 1
00032 
00033 #ifdef __cplusplus
00034 namespace __cxxabiv1
00035 {
00036   extern "C" 
00037   {
00038 #endif
00039 
00040 #ifdef __ARM_EABI__
00041   // The ARM EABI uses the least significant bit of a 32-bit
00042   // guard variable.  */
00043 #define _GLIBCXX_GUARD_TEST(x) ((*(x) & 1) != 0)
00044 #define _GLIBCXX_GUARD_SET(x) *(x) = 1
00045 #define _GLIBCXX_GUARD_BIT 1
00046 #define _GLIBCXX_GUARD_PENDING_BIT __guard_test_bit (1, 1)
00047 #define _GLIBCXX_GUARD_WAITING_BIT __guard_test_bit (2, 1)
00048   typedef int __guard;
00049 
00050   // We also want the element size in array cookies.
00051 #define _GLIBCXX_ELTSIZE_IN_COOKIE 1
00052   
00053   // __cxa_vec_ctor should return a pointer to the array.
00054   typedef void * __cxa_vec_ctor_return_type;
00055 #define _GLIBCXX_CXA_VEC_CTOR_RETURN(x) return x
00056   // Constructors and destructors return the "this" pointer.
00057   typedef void * __cxa_cdtor_return_type;
00058 
00059 #else // __ARM_EABI__
00060 
00061   // The generic ABI uses the first byte of a 64-bit guard variable.
00062 #define _GLIBCXX_GUARD_TEST(x) (*(char *) (x) != 0)
00063 #define _GLIBCXX_GUARD_SET(x) *(char *) (x) = 1
00064 #define _GLIBCXX_GUARD_BIT __guard_test_bit (0, 1)
00065 #define _GLIBCXX_GUARD_PENDING_BIT __guard_test_bit (1, 1)
00066 #define _GLIBCXX_GUARD_WAITING_BIT __guard_test_bit (2, 1)
00067   __extension__ typedef int __guard __attribute__((mode (__DI__)));
00068 
00069   // __cxa_vec_ctor has void return type.
00070   typedef void __cxa_vec_ctor_return_type;
00071 #define _GLIBCXX_CXA_VEC_CTOR_RETURN(x) return
00072   // Constructors and destructors do not return a value.
00073   typedef void __cxa_cdtor_return_type;
00074 
00075 #endif //!__ARM_EABI__
00076 
00077 #ifdef __cplusplus
00078   }
00079 } // namespace __cxxabiv1
00080 #endif
00081 
00082 #endif