Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame^] | 1 | //===------------------------ stdexcept.cpp -------------------------------===// |
| 2 | // |
| 3 | // ÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊThe LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. 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 | #include <libkern/OSAtomic.h> |
| 19 | |
| 20 | // Note: optimize for size |
| 21 | |
| 22 | #pragma GCC visibility push(hidden) |
| 23 | |
| 24 | namespace |
| 25 | { |
| 26 | |
| 27 | class __libcpp_nmstr |
| 28 | { |
| 29 | private: |
| 30 | const char* str_; |
| 31 | |
| 32 | typedef std::size_t unused_t; |
| 33 | typedef std::int32_t count_t; |
| 34 | |
| 35 | static const std::ptrdiff_t offset = static_cast<std::ptrdiff_t>(2*sizeof(unused_t) + |
| 36 | sizeof(count_t)); |
| 37 | |
| 38 | count_t& count() const throw() {return (count_t&)(*(str_ - sizeof(count_t)));} |
| 39 | public: |
| 40 | explicit __libcpp_nmstr(const char* msg); |
| 41 | __libcpp_nmstr(const __libcpp_nmstr& s) _LIBCPP_CANTTHROW; |
| 42 | __libcpp_nmstr& operator=(const __libcpp_nmstr& s) _LIBCPP_CANTTHROW; |
| 43 | ~__libcpp_nmstr() _LIBCPP_CANTTHROW; |
| 44 | const char* c_str() const throw() {return str_;} |
| 45 | }; |
| 46 | |
| 47 | __libcpp_nmstr::__libcpp_nmstr(const char* msg) |
| 48 | { |
| 49 | std::size_t len = strlen(msg); |
| 50 | str_ = new char[len + 1 + offset]; |
| 51 | unused_t* c = (unused_t*)str_; |
| 52 | c[0] = c[1] = len; |
| 53 | str_ += offset; |
| 54 | count() = 0; |
| 55 | std::strcpy(const_cast<char*>(c_str()), msg); |
| 56 | } |
| 57 | |
| 58 | inline |
| 59 | __libcpp_nmstr::__libcpp_nmstr(const __libcpp_nmstr& s) |
| 60 | : str_(s.str_) |
| 61 | { |
| 62 | OSAtomicIncrement32Barrier(&count()); |
| 63 | } |
| 64 | |
| 65 | __libcpp_nmstr& |
| 66 | __libcpp_nmstr::operator=(const __libcpp_nmstr& s) |
| 67 | { |
| 68 | const char* p = str_; |
| 69 | str_ = s.str_; |
| 70 | OSAtomicIncrement32Barrier(&count()); |
| 71 | if (OSAtomicDecrement32((count_t*)(p-sizeof(count_t))) < 0) |
| 72 | delete [] (p-offset); |
| 73 | return *this; |
| 74 | } |
| 75 | |
| 76 | inline |
| 77 | __libcpp_nmstr::~__libcpp_nmstr() |
| 78 | { |
| 79 | if (OSAtomicDecrement32(&count()) < 0) |
| 80 | delete [] (str_ - offset); |
| 81 | } |
| 82 | |
| 83 | } |
| 84 | |
| 85 | #pragma GCC visiblity pop |
| 86 | |
| 87 | namespace std // purposefully not using versioning namespace |
| 88 | { |
| 89 | |
| 90 | logic_error::logic_error(const string& msg) |
| 91 | { |
| 92 | __libcpp_nmstr& s = (__libcpp_nmstr&)__imp_; |
| 93 | ::new(&s) __libcpp_nmstr(msg.c_str()); |
| 94 | } |
| 95 | |
| 96 | logic_error::logic_error(const char* msg) |
| 97 | { |
| 98 | __libcpp_nmstr& s = (__libcpp_nmstr&)__imp_; |
| 99 | ::new(&s) __libcpp_nmstr(msg); |
| 100 | } |
| 101 | |
| 102 | logic_error::logic_error(const logic_error& le) throw() |
| 103 | { |
| 104 | __libcpp_nmstr& s = (__libcpp_nmstr&)__imp_; |
| 105 | ::new(&s) __libcpp_nmstr((const __libcpp_nmstr&)le.__imp_); |
| 106 | } |
| 107 | |
| 108 | logic_error& |
| 109 | logic_error::operator=(const logic_error& le) throw() |
| 110 | { |
| 111 | __libcpp_nmstr& s1 = (__libcpp_nmstr&)__imp_; |
| 112 | const __libcpp_nmstr& s2 = (const __libcpp_nmstr&)le.__imp_; |
| 113 | s1 = s2; |
| 114 | return *this; |
| 115 | } |
| 116 | |
| 117 | logic_error::~logic_error() throw() |
| 118 | { |
| 119 | __libcpp_nmstr& s = (__libcpp_nmstr&)__imp_; |
| 120 | s.~__libcpp_nmstr(); |
| 121 | } |
| 122 | |
| 123 | const char* |
| 124 | logic_error::what() const throw() |
| 125 | { |
| 126 | __libcpp_nmstr& s = (__libcpp_nmstr&)__imp_; |
| 127 | return s.c_str(); |
| 128 | } |
| 129 | |
| 130 | runtime_error::runtime_error(const string& msg) |
| 131 | { |
| 132 | __libcpp_nmstr& s = (__libcpp_nmstr&)__imp_; |
| 133 | ::new(&s) __libcpp_nmstr(msg.c_str()); |
| 134 | } |
| 135 | |
| 136 | runtime_error::runtime_error(const char* msg) |
| 137 | { |
| 138 | __libcpp_nmstr& s = (__libcpp_nmstr&)__imp_; |
| 139 | ::new(&s) __libcpp_nmstr(msg); |
| 140 | } |
| 141 | |
| 142 | runtime_error::runtime_error(const runtime_error& le) throw() |
| 143 | { |
| 144 | __libcpp_nmstr& s = (__libcpp_nmstr&)__imp_; |
| 145 | ::new(&s) __libcpp_nmstr((const __libcpp_nmstr&)le.__imp_); |
| 146 | } |
| 147 | |
| 148 | runtime_error& |
| 149 | runtime_error::operator=(const runtime_error& le) throw() |
| 150 | { |
| 151 | __libcpp_nmstr& s1 = (__libcpp_nmstr&)__imp_; |
| 152 | const __libcpp_nmstr& s2 = (const __libcpp_nmstr&)le.__imp_; |
| 153 | s1 = s2; |
| 154 | return *this; |
| 155 | } |
| 156 | |
| 157 | runtime_error::~runtime_error() throw() |
| 158 | { |
| 159 | __libcpp_nmstr& s = (__libcpp_nmstr&)__imp_; |
| 160 | s.~__libcpp_nmstr(); |
| 161 | } |
| 162 | |
| 163 | const char* |
| 164 | runtime_error::what() const throw() |
| 165 | { |
| 166 | __libcpp_nmstr& s = (__libcpp_nmstr&)__imp_; |
| 167 | return s.c_str(); |
| 168 | } |
| 169 | |
| 170 | domain_error::~domain_error() throw() {} |
| 171 | invalid_argument::~invalid_argument() throw() {} |
| 172 | length_error::~length_error() throw() {} |
| 173 | out_of_range::~out_of_range() throw() {} |
| 174 | |
| 175 | range_error::~range_error() throw() {} |
| 176 | overflow_error::~overflow_error() throw() {} |
| 177 | underflow_error::~underflow_error() throw() {} |
| 178 | |
| 179 | } // std |