system_error.cc revision 1.1.1.2 
1// <system_error> implementation file
2
3// Copyright (C) 2007-2015 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
26#define _GLIBCXX_USE_CXX11_ABI 1
27#define __sso_string __sso_stringxxx
28#include <cstring>
29#include <system_error>
30#include <bits/functexcept.h>
31#include <limits>
32#undef __sso_string
33
34namespace
35{
36  using std::string;
37
38  struct generic_error_category : public std::error_category
39  {
40    virtual const char*
41    name() const noexcept
42    { return "generic"; }
43
44    _GLIBCXX_DEFAULT_ABI_TAG
45    virtual string
46    message(int i) const
47    {
48      // XXX locale issues: how does one get or set loc.
49      // _GLIBCXX_HAVE_STRERROR_L, strerror_l(i, cloc)
50      return string(strerror(i));
51    }
52  };
53
54  struct system_error_category : public std::error_category
55  {
56    virtual const char*
57    name() const noexcept
58    { return "system"; }
59
60    _GLIBCXX_DEFAULT_ABI_TAG
61    virtual string
62    message(int i) const
63    {
64      // XXX locale issues: how does one get or set loc.
65      // _GLIBCXX_HAVE_STRERROR_L, strerror_l(i, cloc)
66      return string(strerror(i));
67    }
68  };
69
70  const generic_error_category generic_category_instance{};
71  const system_error_category system_category_instance{};
72}
73
74namespace std _GLIBCXX_VISIBILITY(default)
75{
76_GLIBCXX_BEGIN_NAMESPACE_VERSION
77
78  error_category::~error_category() noexcept = default;
79
80  const error_category&
81  _V2::system_category() noexcept { return system_category_instance; }
82
83  const error_category&
84  _V2::generic_category() noexcept { return generic_category_instance; }
85
86  system_error::~system_error() noexcept = default;
87
88  error_condition
89  error_category::default_error_condition(int __i) const noexcept
90  { return error_condition(__i, *this); }
91
92  bool
93  error_category::equivalent(int __i,
94			     const error_condition& __cond) const noexcept
95  { return default_error_condition(__i) == __cond; }
96
97  bool
98  error_category::equivalent(const error_code& __code, int __i) const noexcept
99  { return *this == __code.category() && __code.value() == __i; }
100
101  error_condition
102  error_code::default_error_condition() const noexcept
103  { return category().default_error_condition(value()); }
104
105#if _GLIBCXX_USE_CXX11_ABI
106  // Return error_category::message() as a COW string
107  __cow_string
108  error_category::_M_message(int i) const
109  {
110    string msg = this->message(i);
111    return {msg.c_str(), msg.length()};
112  }
113#endif
114
115#if _GLIBCXX_USE_DUAL_ABI
116#pragma GCC diagnostic push
117#pragma GCC diagnostic ignored "-Wabi-tag"
118  // Redefine __sso_string so that we can define and export its members
119  // in terms of the SSO std::string.
120  struct __sso_string
121  {
122    struct __str
123    {
124      const char* _M_p;
125      size_t _M_string_length;
126      char _M_local_buf[16];
127    };
128
129    union {
130      __str _M_s;
131      char _M_bytes[sizeof(_M_s)];
132      std::string _M_str;
133    };
134
135    __sso_string();
136    __sso_string(const std::string& s);
137    __sso_string(const char*, size_t n);
138    __sso_string(const __sso_string&) noexcept;
139    __sso_string& operator=(const __sso_string&) noexcept;
140    ~__sso_string();
141    __sso_string(__sso_string&&) noexcept;
142    __sso_string& operator=(__sso_string&&) noexcept;
143  };
144#pragma GCC diagnostic pop
145
146  __sso_string::__sso_string() : _M_str() { }
147
148#if _GLIBCXX_USE_CXX11_ABI
149  static_assert(sizeof(__sso_string) == sizeof(std::string),
150                "sizeof(std::string) has changed");
151  static_assert(alignof(__sso_string) == alignof(std::string),
152                "alignof(std::string) has changed");
153
154  // This constructor is defined in src/c++11/cow-stdexcept.cc for COW strings
155  __sso_string::__sso_string(const std::string& s) : _M_str(s) { }
156#endif
157
158  __sso_string::__sso_string(const char* s, size_t n) : _M_str(s, n) { }
159
160  __sso_string::__sso_string(const __sso_string& s) noexcept
161  : _M_str(s._M_str) { }
162
163  __sso_string&
164  __sso_string::operator=(const __sso_string& s) noexcept
165  {
166    _M_str = s._M_str;
167    return *this;
168  }
169
170  __sso_string::~__sso_string() { _M_str.~basic_string(); }
171
172  __sso_string::__sso_string(__sso_string&& s) noexcept
173  : _M_str(std::move(s._M_str)) { }
174
175  __sso_string&
176  __sso_string::operator=(__sso_string&& s) noexcept
177  {
178    _M_str = std::move(s._M_str);
179    return *this;
180  }
181#endif // _GLIBCXX_USE_DUAL_ABI
182
183_GLIBCXX_END_NAMESPACE_VERSION
184} // namespace
185