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1 | // Helper for accessing __cxx11::string from the ABI -*- C++ -*- |
2 | ||
a945c346 | 3 | // Copyright (C) 2014-2024 Free Software Foundation, Inc. |
b333e8eb JW |
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 | ||
26 | #define _GLIBCXX_USE_CXX11_ABI 1 | |
27 | #define __sso_string __sso_stringxxx | |
28 | #include <string> | |
29 | #include <stdexcept> | |
30 | #undef __sso_string | |
31 | ||
32 | #if ! _GLIBCXX_USE_DUAL_ABI | |
33 | # error This file should not be compiled for this configuration. | |
34 | #endif | |
35 | ||
36 | namespace std _GLIBCXX_VISIBILITY(default) | |
37 | { | |
38 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
39 | ||
40 | #pragma GCC diagnostic push | |
41 | #pragma GCC diagnostic ignored "-Wabi-tag" | |
42 | // Redefine __sso_string so that we can define and export its members | |
43 | // in terms of the SSO std::string. | |
44 | struct __sso_string | |
45 | { | |
46 | struct __str | |
47 | { | |
48 | const char* _M_p; | |
49 | size_t _M_string_length; | |
50 | char _M_local_buf[16]; | |
51 | }; | |
52 | ||
53 | union { | |
54 | __str _M_s; | |
55 | char _M_bytes[sizeof(_M_s)]; | |
56 | std::string _M_str; | |
57 | }; | |
58 | ||
59 | __sso_string(); | |
60 | __sso_string(const std::string& s); | |
61 | __sso_string(const char*, size_t n); | |
62 | __sso_string(const __sso_string&) noexcept; | |
63 | __sso_string& operator=(const __sso_string&) noexcept; | |
64 | ~__sso_string(); | |
65 | __sso_string(__sso_string&&) noexcept; | |
66 | __sso_string& operator=(__sso_string&&) noexcept; | |
67 | }; | |
68 | #pragma GCC diagnostic pop | |
69 | ||
70 | __sso_string::__sso_string() : _M_str() { } | |
71 | ||
72 | #if _GLIBCXX_USE_CXX11_ABI | |
73 | static_assert(sizeof(__sso_string) == sizeof(std::string), | |
74 | "sizeof(std::string) has changed"); | |
75 | static_assert(alignof(__sso_string) == alignof(std::string), | |
76 | "alignof(std::string) has changed"); | |
77 | ||
78 | // This constructor is defined in src/c++11/cow-stdexcept.cc for COW strings | |
79 | __sso_string::__sso_string(const std::string& s) : _M_str(s) { } | |
80 | #endif | |
81 | ||
82 | __sso_string::__sso_string(const char* s, size_t n) : _M_str(s, n) { } | |
83 | ||
84 | __sso_string::__sso_string(const __sso_string& s) noexcept | |
85 | : _M_str(s._M_str) { } | |
86 | ||
87 | __sso_string& | |
88 | __sso_string::operator=(const __sso_string& s) noexcept | |
89 | { | |
90 | _M_str = s._M_str; | |
91 | return *this; | |
92 | } | |
93 | ||
94 | __sso_string::~__sso_string() { _M_str.~basic_string(); } | |
95 | ||
96 | __sso_string::__sso_string(__sso_string&& s) noexcept | |
97 | : _M_str(std::move(s._M_str)) { } | |
98 | ||
99 | __sso_string& | |
100 | __sso_string::operator=(__sso_string&& s) noexcept | |
101 | { | |
102 | _M_str = std::move(s._M_str); | |
103 | return *this; | |
104 | } | |
105 | ||
106 | _GLIBCXX_END_NAMESPACE_VERSION | |
107 | } // namespace |