1*38fd1498Szrj // Helper for accessing __cxx11::string from the ABI -*- C++ -*- 2*38fd1498Szrj 3*38fd1498Szrj // Copyright (C) 2014-2018 Free Software Foundation, Inc. 4*38fd1498Szrj // 5*38fd1498Szrj // This file is part of the GNU ISO C++ Library. This library is free 6*38fd1498Szrj // software; you can redistribute it and/or modify it under the 7*38fd1498Szrj // terms of the GNU General Public License as published by the 8*38fd1498Szrj // Free Software Foundation; either version 3, or (at your option) 9*38fd1498Szrj // any later version. 10*38fd1498Szrj 11*38fd1498Szrj // This library is distributed in the hope that it will be useful, 12*38fd1498Szrj // but WITHOUT ANY WARRANTY; without even the implied warranty of 13*38fd1498Szrj // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14*38fd1498Szrj // GNU General Public License for more details. 15*38fd1498Szrj 16*38fd1498Szrj // Under Section 7 of GPL version 3, you are granted additional 17*38fd1498Szrj // permissions described in the GCC Runtime Library Exception, version 18*38fd1498Szrj // 3.1, as published by the Free Software Foundation. 19*38fd1498Szrj 20*38fd1498Szrj // You should have received a copy of the GNU General Public License and 21*38fd1498Szrj // a copy of the GCC Runtime Library Exception along with this program; 22*38fd1498Szrj // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23*38fd1498Szrj // <http://www.gnu.org/licenses/>. 24*38fd1498Szrj 25*38fd1498Szrj 26*38fd1498Szrj #define _GLIBCXX_USE_CXX11_ABI 1 27*38fd1498Szrj #define __sso_string __sso_stringxxx 28*38fd1498Szrj #include <string> 29*38fd1498Szrj #include <stdexcept> 30*38fd1498Szrj #undef __sso_string 31*38fd1498Szrj 32*38fd1498Szrj #if ! _GLIBCXX_USE_DUAL_ABI 33*38fd1498Szrj # error This file should not be compiled for this configuration. 34*38fd1498Szrj #endif 35*38fd1498Szrj 36*38fd1498Szrj namespace std _GLIBCXX_VISIBILITY(default) 37*38fd1498Szrj { 38*38fd1498Szrj _GLIBCXX_BEGIN_NAMESPACE_VERSION 39*38fd1498Szrj 40*38fd1498Szrj #pragma GCC diagnostic push 41*38fd1498Szrj #pragma GCC diagnostic ignored "-Wabi-tag" 42*38fd1498Szrj // Redefine __sso_string so that we can define and export its members 43*38fd1498Szrj // in terms of the SSO std::string. 44*38fd1498Szrj struct __sso_string 45*38fd1498Szrj { 46*38fd1498Szrj struct __str 47*38fd1498Szrj { 48*38fd1498Szrj const char* _M_p; 49*38fd1498Szrj size_t _M_string_length; 50*38fd1498Szrj char _M_local_buf[16]; 51*38fd1498Szrj }; 52*38fd1498Szrj 53*38fd1498Szrj union { 54*38fd1498Szrj __str _M_s; 55*38fd1498Szrj char _M_bytes[sizeof(_M_s)]; 56*38fd1498Szrj std::string _M_str; 57*38fd1498Szrj }; 58*38fd1498Szrj 59*38fd1498Szrj __sso_string(); 60*38fd1498Szrj __sso_string(const std::string& s); 61*38fd1498Szrj __sso_string(const char*, size_t n); 62*38fd1498Szrj __sso_string(const __sso_string&) noexcept; 63*38fd1498Szrj __sso_string& operator=(const __sso_string&) noexcept; 64*38fd1498Szrj ~__sso_string(); 65*38fd1498Szrj __sso_string(__sso_string&&) noexcept; 66*38fd1498Szrj __sso_string& operator=(__sso_string&&) noexcept; 67*38fd1498Szrj }; 68*38fd1498Szrj #pragma GCC diagnostic pop 69*38fd1498Szrj __sso_string()70*38fd1498Szrj __sso_string::__sso_string() : _M_str() { } 71*38fd1498Szrj 72*38fd1498Szrj #if _GLIBCXX_USE_CXX11_ABI 73*38fd1498Szrj static_assert(sizeof(__sso_string) == sizeof(std::string), 74*38fd1498Szrj "sizeof(std::string) has changed"); 75*38fd1498Szrj static_assert(alignof(__sso_string) == alignof(std::string), 76*38fd1498Szrj "alignof(std::string) has changed"); 77*38fd1498Szrj 78*38fd1498Szrj // This constructor is defined in src/c++11/cow-stdexcept.cc for COW strings __sso_string(const std::string & s)79*38fd1498Szrj __sso_string::__sso_string(const std::string& s) : _M_str(s) { } 80*38fd1498Szrj #endif 81*38fd1498Szrj __sso_string(const char * s,size_t n)82*38fd1498Szrj __sso_string::__sso_string(const char* s, size_t n) : _M_str(s, n) { } 83*38fd1498Szrj __sso_string(const __sso_string & s)84*38fd1498Szrj __sso_string::__sso_string(const __sso_string& s) noexcept 85*38fd1498Szrj : _M_str(s._M_str) { } 86*38fd1498Szrj 87*38fd1498Szrj __sso_string& operator =(const __sso_string & s)88*38fd1498Szrj __sso_string::operator=(const __sso_string& s) noexcept 89*38fd1498Szrj { 90*38fd1498Szrj _M_str = s._M_str; 91*38fd1498Szrj return *this; 92*38fd1498Szrj } 93*38fd1498Szrj ~__sso_string()94*38fd1498Szrj __sso_string::~__sso_string() { _M_str.~basic_string(); } 95*38fd1498Szrj __sso_string(__sso_string && s)96*38fd1498Szrj __sso_string::__sso_string(__sso_string&& s) noexcept 97*38fd1498Szrj : _M_str(std::move(s._M_str)) { } 98*38fd1498Szrj 99*38fd1498Szrj __sso_string& operator =(__sso_string && s)100*38fd1498Szrj __sso_string::operator=(__sso_string&& s) noexcept 101*38fd1498Szrj { 102*38fd1498Szrj _M_str = std::move(s._M_str); 103*38fd1498Szrj return *this; 104*38fd1498Szrj } 105*38fd1498Szrj 106*38fd1498Szrj _GLIBCXX_END_NAMESPACE_VERSION 107*38fd1498Szrj } // namespace 108