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1 //===------------------------ stdexcept.cpp -------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "stdexcept"
11 #include "new"
12 #include "string"
13 #include <cstdlib>
14 #include <cstring>
15 #include <cstdint>
16 #include <cstddef>
17 #include "system_error"
18 
19 #ifndef __has_include
20 #define __has_include(inc) 0
21 #endif
22 
23 #ifdef __APPLE__
24 #include <cxxabi.h>
25 #elif defined(LIBCXXRT) || __has_include(<cxxabi.h>)
26 #include <cxxabi.h>
27 #endif
28 
29 // Note:  optimize for size
30 
31 #pragma GCC visibility push(hidden)
32 
33 namespace
34 {
35 
36 class __libcpp_nmstr
37 {
38 private:
39     const char* str_;
40 
41     typedef std::size_t unused_t;
42     typedef std::ptrdiff_t count_t;
43 
44     static const std::ptrdiff_t offset = static_cast<std::ptrdiff_t>(2*sizeof(unused_t) +
45                                                                        sizeof(count_t));
46 
count() const47     count_t& count() const _NOEXCEPT {return (count_t&)(*(str_ - sizeof(count_t)));}
48 public:
49     explicit __libcpp_nmstr(const char* msg);
50     __libcpp_nmstr(const __libcpp_nmstr& s) _LIBCPP_CANTTHROW;
51     __libcpp_nmstr& operator=(const __libcpp_nmstr& s) _LIBCPP_CANTTHROW;
52     ~__libcpp_nmstr() _LIBCPP_CANTTHROW;
c_str() const53     const char* c_str() const _NOEXCEPT {return str_;}
54 };
55 
__libcpp_nmstr(const char * msg)56 __libcpp_nmstr::__libcpp_nmstr(const char* msg)
57 {
58     std::size_t len = strlen(msg);
59     str_ = new char[len + 1 + offset];
60     unused_t* c = (unused_t*)str_;
61     c[0] = c[1] = len;
62     str_ += offset;
63     count() = 0;
64     std::memcpy(const_cast<char*>(c_str()), msg, len + 1);
65 }
66 
67 inline
__libcpp_nmstr(const __libcpp_nmstr & s)68 __libcpp_nmstr::__libcpp_nmstr(const __libcpp_nmstr& s)
69     : str_(s.str_)
70 {
71     __sync_add_and_fetch(&count(), 1);
72 }
73 
74 __libcpp_nmstr&
operator =(const __libcpp_nmstr & s)75 __libcpp_nmstr::operator=(const __libcpp_nmstr& s)
76 {
77     const char* p = str_;
78     str_ = s.str_;
79     __sync_add_and_fetch(&count(), 1);
80     if (__sync_add_and_fetch((count_t*)(p-sizeof(count_t)), count_t(-1)) < 0)
81         delete [] (p-offset);
82     return *this;
83 }
84 
85 inline
~__libcpp_nmstr()86 __libcpp_nmstr::~__libcpp_nmstr()
87 {
88     if (__sync_add_and_fetch(&count(), count_t(-1)) < 0)
89         delete [] (str_ - offset);
90 }
91 
92 }
93 
94 #pragma GCC visibility pop
95 
96 namespace std  // purposefully not using versioning namespace
97 {
98 
logic_error(const string & msg)99 logic_error::logic_error(const string& msg)
100 {
101     __libcpp_nmstr& s = (__libcpp_nmstr&)__imp_;
102     ::new(&s) __libcpp_nmstr(msg.c_str());
103 }
104 
logic_error(const char * msg)105 logic_error::logic_error(const char* msg)
106 {
107     __libcpp_nmstr& s = (__libcpp_nmstr&)__imp_;
108     ::new(&s) __libcpp_nmstr(msg);
109 }
110 
logic_error(const logic_error & le)111 logic_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 
117 logic_error&
operator =(const logic_error & le)118 logic_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 
~logic_error()128 logic_error::~logic_error() _NOEXCEPT
129 {
130     __libcpp_nmstr& s = (__libcpp_nmstr&)__imp_;
131     s.~__libcpp_nmstr();
132 }
133 
134 const char*
what() const135 logic_error::what() const _NOEXCEPT
136 {
137     __libcpp_nmstr& s = (__libcpp_nmstr&)__imp_;
138     return s.c_str();
139 }
140 
141 #endif
142 
runtime_error(const string & msg)143 runtime_error::runtime_error(const string& msg)
144 {
145     __libcpp_nmstr& s = (__libcpp_nmstr&)__imp_;
146     ::new(&s) __libcpp_nmstr(msg.c_str());
147 }
148 
runtime_error(const char * msg)149 runtime_error::runtime_error(const char* msg)
150 {
151     __libcpp_nmstr& s = (__libcpp_nmstr&)__imp_;
152     ::new(&s) __libcpp_nmstr(msg);
153 }
154 
runtime_error(const runtime_error & le)155 runtime_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 
161 runtime_error&
operator =(const runtime_error & le)162 runtime_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 
~runtime_error()172 runtime_error::~runtime_error() _NOEXCEPT
173 {
174     __libcpp_nmstr& s = (__libcpp_nmstr&)__imp_;
175     s.~__libcpp_nmstr();
176 }
177 
178 const char*
what() const179 runtime_error::what() const _NOEXCEPT
180 {
181     __libcpp_nmstr& s = (__libcpp_nmstr&)__imp_;
182     return s.c_str();
183 }
184 
~domain_error()185 domain_error::~domain_error() _NOEXCEPT {}
~invalid_argument()186 invalid_argument::~invalid_argument() _NOEXCEPT {}
~length_error()187 length_error::~length_error() _NOEXCEPT {}
~out_of_range()188 out_of_range::~out_of_range() _NOEXCEPT {}
189 
~range_error()190 range_error::~range_error() _NOEXCEPT {}
~overflow_error()191 overflow_error::~overflow_error() _NOEXCEPT {}
~underflow_error()192 underflow_error::~underflow_error() _NOEXCEPT {}
193 
194 #endif
195 
196 }  // std
197