170 lines
3.8 KiB
C++
170 lines
3.8 KiB
C++
//===------------------------ stdexcept.cpp -------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "stdexcept"
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#include "new"
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#include <cstdlib>
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#include <cstring>
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#include <cstdint>
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#include <cstddef>
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#if __APPLE__
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#include <dlfcn.h>
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#include <mach-o/dyld.h>
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#endif
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// Note: optimize for size
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#pragma GCC visibility push(hidden)
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namespace
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{
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class __libcpp_nmstr
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{
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private:
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const char* str_;
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typedef int count_t;
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struct _Rep_base
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{
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std::size_t len;
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std::size_t cap;
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count_t count;
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};
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static const std::ptrdiff_t offset = static_cast<std::ptrdiff_t>(sizeof(_Rep_base));
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count_t& count() const _NOEXCEPT {return ((_Rep_base*)(str_ - offset))->count;}
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#if __APPLE__
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static
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const void*
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compute_gcc_empty_string_storage() _LIBCPP_CANTTHROW
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{
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void* handle = dlopen("/usr/lib/libstdc++.6.dylib", RTLD_NOLOAD);
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if (handle == 0)
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return 0;
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return (const char*)dlsym(handle, "_ZNSs4_Rep20_S_empty_rep_storageE") + offset;
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}
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static
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const void*
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get_gcc_empty_string_storage() _LIBCPP_CANTTHROW
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{
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static const void* p = compute_gcc_empty_string_storage();
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return p;
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}
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#endif
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public:
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explicit __libcpp_nmstr(const char* msg);
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__libcpp_nmstr(const __libcpp_nmstr& s) _LIBCPP_CANTTHROW;
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__libcpp_nmstr& operator=(const __libcpp_nmstr& s) _LIBCPP_CANTTHROW;
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~__libcpp_nmstr() _LIBCPP_CANTTHROW;
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const char* c_str() const _NOEXCEPT {return str_;}
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};
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__libcpp_nmstr::__libcpp_nmstr(const char* msg)
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{
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std::size_t len = strlen(msg);
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str_ = static_cast<const char*>(::operator new(len + 1 + offset));
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_Rep_base* c = (_Rep_base*)str_;
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c->len = c->cap = len;
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str_ += offset;
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count() = 0;
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std::strcpy(const_cast<char*>(c_str()), msg);
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}
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inline
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__libcpp_nmstr::__libcpp_nmstr(const __libcpp_nmstr& s)
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: str_(s.str_)
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{
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#if __APPLE__
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if (str_ != get_gcc_empty_string_storage())
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#endif
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__sync_add_and_fetch(&count(), 1);
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}
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__libcpp_nmstr&
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__libcpp_nmstr::operator=(const __libcpp_nmstr& s)
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{
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const char* p = str_;
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str_ = s.str_;
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#if __APPLE__
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if (str_ != get_gcc_empty_string_storage())
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#endif
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__sync_add_and_fetch(&count(), 1);
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#if __APPLE__
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if (p != get_gcc_empty_string_storage())
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#endif
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if (__sync_add_and_fetch((count_t*)(p-sizeof(count_t)), count_t(-1)) < 0)
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{
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::operator delete(const_cast<char*>(p-offset));
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}
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return *this;
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}
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inline
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__libcpp_nmstr::~__libcpp_nmstr()
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{
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#if __APPLE__
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if (str_ != get_gcc_empty_string_storage())
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#endif
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if (__sync_add_and_fetch(&count(), count_t(-1)) < 0)
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{
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::operator delete(const_cast<char*>(str_ - offset));
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}
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}
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}
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#pragma GCC visibility pop
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namespace std // purposefully not using versioning namespace
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{
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logic_error::~logic_error() _NOEXCEPT
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{
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__libcpp_nmstr& s = (__libcpp_nmstr&)__imp_;
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s.~__libcpp_nmstr();
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}
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const char*
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logic_error::what() const _NOEXCEPT
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{
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__libcpp_nmstr& s = (__libcpp_nmstr&)__imp_;
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return s.c_str();
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}
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runtime_error::~runtime_error() _NOEXCEPT
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{
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__libcpp_nmstr& s = (__libcpp_nmstr&)__imp_;
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s.~__libcpp_nmstr();
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}
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const char*
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runtime_error::what() const _NOEXCEPT
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{
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__libcpp_nmstr& s = (__libcpp_nmstr&)__imp_;
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return s.c_str();
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}
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domain_error::~domain_error() _NOEXCEPT {}
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invalid_argument::~invalid_argument() _NOEXCEPT {}
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length_error::~length_error() _NOEXCEPT {}
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out_of_range::~out_of_range() _NOEXCEPT {}
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range_error::~range_error() _NOEXCEPT {}
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overflow_error::~overflow_error() _NOEXCEPT {}
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underflow_error::~underflow_error() _NOEXCEPT {}
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} // std
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