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