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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>
// Note: optimize for size
#pragma GCC visibility push(hidden)
namespace
{
class __libcpp_nmstr
{
private:
const char* str_;
typedef std::size_t unused_t;
typedef std::int32_t count_t;
static const std::ptrdiff_t offset = static_cast<std::ptrdiff_t>(2*sizeof(unused_t) +
sizeof(count_t));
count_t& count() const _NOEXCEPT {return (count_t&)(*(str_ - sizeof(count_t)));}
public:
explicit __libcpp_nmstr(const char* msg);
__libcpp_nmstr(const __libcpp_nmstr& s) _LIBCPP_CANTTHROW;
__libcpp_nmstr& operator=(const __libcpp_nmstr& s) _LIBCPP_CANTTHROW;
~__libcpp_nmstr() _LIBCPP_CANTTHROW;
const char* c_str() const _NOEXCEPT {return str_;}
};
__libcpp_nmstr::__libcpp_nmstr(const char* msg)
{
std::size_t len = strlen(msg);
str_ = new char[len + 1 + offset];
unused_t* c = (unused_t*)str_;
c[0] = c[1] = len;
str_ += offset;
count() = 0;
std::strcpy(const_cast<char*>(c_str()), msg);
}
inline
__libcpp_nmstr::__libcpp_nmstr(const __libcpp_nmstr& s)
: str_(s.str_)
{
__sync_add_and_fetch(&count(), 1);
}
__libcpp_nmstr&
__libcpp_nmstr::operator=(const __libcpp_nmstr& s)
{
const char* p = str_;
str_ = s.str_;
__sync_add_and_fetch(&count(), 1);
if (__sync_add_and_fetch((count_t*)(p-sizeof(count_t)), -1) < 0)
delete [] (p-offset);
return *this;
}
inline
__libcpp_nmstr::~__libcpp_nmstr()
{
if (__sync_add_and_fetch(&count(), -1) < 0)
delete [] (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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