185909Simp//===------------------------ stdexcept.cpp -------------------------------===//
285909Simp//
385909Simp//                     The LLVM Compiler Infrastructure
485909Simp//
585909Simp// This file is dual licensed under the MIT and the University of Illinois Open
685909Simp// Source Licenses. See LICENSE.TXT for details.
785909Simp//
885909Simp//===----------------------------------------------------------------------===//
985909Simp
1085909Simp#include "stdexcept"
1185909Simp#include "new"
1285909Simp#include "string"
1385909Simp#include <cstdlib>
1485909Simp#include <cstring>
1585909Simp#include <cstdint>
1685909Simp#include <cstddef>
1785909Simp#include "system_error"
1885909Simp
1985909Simp#ifndef __has_include
2085909Simp#define __has_include(inc) 0
2185909Simp#endif
2285909Simp
2385909Simp#ifdef __APPLE__
2485909Simp#include <cxxabi.h>
2585909Simp#elif defined(LIBCXXRT) || __has_include(<cxxabi.h>)
2685909Simp#include <cxxabi.h>
2785909Simp#endif
2885909Simp
2985909Simp// Note:  optimize for size
3085909Simp
3185909Simp#pragma GCC visibility push(hidden)
3285909Simp
3385909Simpnamespace
3485909Simp{
3585909Simp
3685909Simpclass __libcpp_nmstr
3785909Simp{
3885909Simpprivate:
3985909Simp    const char* str_;
4087451Sobrien
4189180Smsmith    typedef std::size_t unused_t;
4285909Simp    typedef std::ptrdiff_t count_t;
4385909Simp
4485909Simp    static const std::ptrdiff_t offset = static_cast<std::ptrdiff_t>(2*sizeof(unused_t) +
4585909Simp                                                                       sizeof(count_t));
4685909Simp
4785909Simp    count_t& count() const _NOEXCEPT {return (count_t&)(*(str_ - sizeof(count_t)));}
4885909Simppublic:
4985909Simp    explicit __libcpp_nmstr(const char* msg);
5085909Simp    __libcpp_nmstr(const __libcpp_nmstr& s) _LIBCPP_CANTTHROW;
5185909Simp    __libcpp_nmstr& operator=(const __libcpp_nmstr& s) _LIBCPP_CANTTHROW;
5285909Simp    ~__libcpp_nmstr() _LIBCPP_CANTTHROW;
5385909Simp    const char* c_str() const _NOEXCEPT {return str_;}
5485909Simp};
5585909Simp
5685909Simp__libcpp_nmstr::__libcpp_nmstr(const char* msg)
5785909Simp{
5885909Simp    std::size_t len = strlen(msg);
5985909Simp    str_ = new char[len + 1 + offset];
6085909Simp    unused_t* c = (unused_t*)str_;
6185909Simp    c[0] = c[1] = len;
6285909Simp    str_ += offset;
6385909Simp    count() = 0;
6485909Simp    std::memcpy(const_cast<char*>(c_str()), msg, len + 1);
6585909Simp}
6685909Simp
6785909Simpinline
6885909Simp__libcpp_nmstr::__libcpp_nmstr(const __libcpp_nmstr& s)
6985909Simp    : str_(s.str_)
7085909Simp{
7185909Simp    __sync_add_and_fetch(&count(), 1);
7285909Simp}
7385909Simp
7485909Simp__libcpp_nmstr&
7585909Simp__libcpp_nmstr::operator=(const __libcpp_nmstr& s)
7685909Simp{
7785909Simp    const char* p = str_;
7885909Simp    str_ = s.str_;
7989180Smsmith    __sync_add_and_fetch(&count(), 1);
8085909Simp    if (__sync_add_and_fetch((count_t*)(p-sizeof(count_t)), count_t(-1)) < 0)
8185909Simp        delete [] (p-offset);
8285909Simp    return *this;
8385909Simp}
8485909Simp
8588893Simpinline
8688893Simp__libcpp_nmstr::~__libcpp_nmstr()
8788893Simp{
8888893Simp    if (__sync_add_and_fetch(&count(), count_t(-1)) < 0)
8988893Simp        delete [] (str_ - offset);
9088893Simp}
9188893Simp
9288893Simp}
9388893Simp
9488893Simp#pragma GCC visibility pop
9588893Simp
9686253Simpnamespace std  // purposefully not using versioning namespace
97{
98
99logic_error::logic_error(const string& msg)
100{
101    __libcpp_nmstr& s = (__libcpp_nmstr&)__imp_;
102    ::new(&s) __libcpp_nmstr(msg.c_str());
103}
104
105logic_error::logic_error(const char* msg)
106{
107    __libcpp_nmstr& s = (__libcpp_nmstr&)__imp_;
108    ::new(&s) __libcpp_nmstr(msg);
109}
110
111logic_error::logic_error(const logic_error& le) _NOEXCEPT
112{
113    __libcpp_nmstr& s = (__libcpp_nmstr&)__imp_;
114    ::new(&s) __libcpp_nmstr((const __libcpp_nmstr&)le.__imp_);
115}
116
117logic_error&
118logic_error::operator=(const logic_error& le) _NOEXCEPT
119{
120    __libcpp_nmstr& s1 = (__libcpp_nmstr&)__imp_;
121    const __libcpp_nmstr& s2 = (const __libcpp_nmstr&)le.__imp_;
122    s1 = s2;
123    return *this;
124}
125
126#ifndef _LIBCPPABI_VERSION
127
128logic_error::~logic_error() _NOEXCEPT
129{
130    __libcpp_nmstr& s = (__libcpp_nmstr&)__imp_;
131    s.~__libcpp_nmstr();
132}
133
134const char*
135logic_error::what() const _NOEXCEPT
136{
137    __libcpp_nmstr& s = (__libcpp_nmstr&)__imp_;
138    return s.c_str();
139}
140
141#endif
142
143runtime_error::runtime_error(const string& msg)
144{
145    __libcpp_nmstr& s = (__libcpp_nmstr&)__imp_;
146    ::new(&s) __libcpp_nmstr(msg.c_str());
147}
148
149runtime_error::runtime_error(const char* msg)
150{
151    __libcpp_nmstr& s = (__libcpp_nmstr&)__imp_;
152    ::new(&s) __libcpp_nmstr(msg);
153}
154
155runtime_error::runtime_error(const runtime_error& le) _NOEXCEPT
156{
157    __libcpp_nmstr& s = (__libcpp_nmstr&)__imp_;
158    ::new(&s) __libcpp_nmstr((const __libcpp_nmstr&)le.__imp_);
159}
160
161runtime_error&
162runtime_error::operator=(const runtime_error& le) _NOEXCEPT
163{
164    __libcpp_nmstr& s1 = (__libcpp_nmstr&)__imp_;
165    const __libcpp_nmstr& s2 = (const __libcpp_nmstr&)le.__imp_;
166    s1 = s2;
167    return *this;
168}
169
170#ifndef _LIBCPPABI_VERSION
171
172runtime_error::~runtime_error() _NOEXCEPT
173{
174    __libcpp_nmstr& s = (__libcpp_nmstr&)__imp_;
175    s.~__libcpp_nmstr();
176}
177
178const char*
179runtime_error::what() const _NOEXCEPT
180{
181    __libcpp_nmstr& s = (__libcpp_nmstr&)__imp_;
182    return s.c_str();
183}
184
185domain_error::~domain_error() _NOEXCEPT {}
186invalid_argument::~invalid_argument() _NOEXCEPT {}
187length_error::~length_error() _NOEXCEPT {}
188out_of_range::~out_of_range() _NOEXCEPT {}
189
190range_error::~range_error() _NOEXCEPT {}
191overflow_error::~overflow_error() _NOEXCEPT {}
192underflow_error::~underflow_error() _NOEXCEPT {}
193
194#endif
195
196}  // std
197