// -*- C++ -*-

//===----------------------------------------------------------------------===//

//

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

// See https://llvm.org/LICENSE.txt for license information.

// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

//

//===----------------------------------------------------------------------===//

#ifndef _LIBCPP_EXCEPTION

#define _LIBCPP_EXCEPTION

/*

    exception synopsis

namespace std

{

class exception

{

public:

    exception() noexcept;

    exception(const exception&) noexcept;

    exception& operator=(const exception&) noexcept;

    virtual ~exception() noexcept;

    virtual const char* what() const noexcept;

};

class bad_exception

    : public exception

{

public:

    bad_exception() noexcept;

    bad_exception(const bad_exception&) noexcept;

    bad_exception& operator=(const bad_exception&) noexcept;

    virtual ~bad_exception() noexcept;

    virtual const char* what() const noexcept;

};

typedef void (*unexpected_handler)();

unexpected_handler set_unexpected(unexpected_handler  f ) noexcept;

unexpected_handler get_unexpected() noexcept;

[[noreturn]] void unexpected();

typedef void (*terminate_handler)();

terminate_handler set_terminate(terminate_handler  f ) noexcept;

terminate_handler get_terminate() noexcept;

[[noreturn]] void terminate() noexcept;

bool uncaught_exception()  noexcept;

int  uncaught_exceptions() noexcept;  // C++17

typedef unspecified exception_ptr;

exception_ptr current_exception() noexcept;

void rethrow_exception [[noreturn]] (exception_ptr p);

template<class E> exception_ptr make_exception_ptr(E e) noexcept;

class nested_exception

{

public:

    nested_exception() noexcept;

    nested_exception(const nested_exception&) noexcept = default;

    nested_exception& operator=(const nested_exception&) noexcept = default;

    virtual ~nested_exception() = default;

    // access functions

    [[noreturn]] void rethrow_nested() const;

    exception_ptr nested_ptr() const noexcept;

};

template <class T> [[noreturn]] void throw_with_nested(T&& t);

template <class E> void rethrow_if_nested(const E& e);

}  // std

*/

#include <__assert> // all public C++ headers provide the assertion handler

#include <__availability>

#include <__config>

#include <__memory/addressof.h>

#include <__type_traits/decay.h>

#include <__type_traits/is_base_of.h>

#include <__type_traits/is_class.h>

#include <__type_traits/is_convertible.h>

#include <__type_traits/is_copy_constructible.h>

#include <__type_traits/is_final.h>

#include <__type_traits/is_polymorphic.h>

#include <cstddef>

#include <cstdlib>

#include <version>

// <vcruntime_exception.h> defines its own std::exception and std::bad_exception types,

// which we use in order to be ABI-compatible with other STLs on Windows.

#if defined(_LIBCPP_ABI_VCRUNTIME)

#  include <vcruntime_exception.h>

#endif

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)

#  pragma GCC system_header

#endif

namespace std  // purposefully not using versioning namespace

{

#if defined(_LIBCPP_ABI_VCRUNTIME) && (!defined(_HAS_EXCEPTIONS) || _HAS_EXCEPTIONS != 0)

// The std::exception class was already included above, but we're explicit about this condition here for clarity.

#elif defined(_LIBCPP_ABI_VCRUNTIME) && _HAS_EXCEPTIONS == 0

// However, <vcruntime_exception.h> does not define std::exception and std::bad_exception

// when _HAS_EXCEPTIONS == 0.

//

// Since libc++ still wants to provide the std::exception hierarchy even when _HAS_EXCEPTIONS == 0

// (after all those are simply types like any other), we define an ABI-compatible version

// of the VCRuntime std::exception and std::bad_exception types in that mode.

struct __std_exception_data {

  char const* _What;

  bool _DoFree;

};

class exception { // base of all library exceptions

public:

  exception() _NOEXCEPT : __data_() {}

  explicit exception(char const* __message) _NOEXCEPT : __data_() {

    __data_._What = __message;

    __data_._DoFree = true;

  }

  exception(exception const&) _NOEXCEPT {}

  exception& operator=(exception const&) _NOEXCEPT { return *this; }

  virtual ~exception() _NOEXCEPT {}

  virtual char const* what() const _NOEXCEPT { return __data_._What ? __data_._What : "Unknown exception"; }

private:

  __std_exception_data __data_;

};

class bad_exception : public exception {

public:

  bad_exception() _NOEXCEPT : exception("bad exception") {}

};

#else // !defined(_LIBCPP_ABI_VCRUNTIME)

// On all other platforms, we define our own std::exception and std::bad_exception types

// regardless of whether exceptions are turned on as a language feature.

class _LIBCPP_EXCEPTION_ABI exception {

public:

  _LIBCPP_INLINE_VISIBILITY exception() _NOEXCEPT {}

  _LIBCPP_INLINE_VISIBILITY exception(const exception&) _NOEXCEPT = default;

  virtual ~exception() _NOEXCEPT;

  virtual const char* what() const _NOEXCEPT;

};

class _LIBCPP_EXCEPTION_ABI bad_exception : public exception {

public:

  _LIBCPP_INLINE_VISIBILITY bad_exception() _NOEXCEPT {}

  ~bad_exception() _NOEXCEPT override;

  const char* what() const _NOEXCEPT override;

};

#endif // !_LIBCPP_ABI_VCRUNTIME

#if _LIBCPP_STD_VER <= 14 \

    || defined(_LIBCPP_ENABLE_CXX17_REMOVED_UNEXPECTED_FUNCTIONS) \

    || defined(_LIBCPP_BUILDING_LIBRARY)

typedef void (*unexpected_handler)();

_LIBCPP_FUNC_VIS unexpected_handler set_unexpected(unexpected_handler) _NOEXCEPT;

_LIBCPP_FUNC_VIS unexpected_handler get_unexpected() _NOEXCEPT;

_LIBCPP_NORETURN _LIBCPP_FUNC_VIS void unexpected();

#endif

typedef void (*terminate_handler)();

_LIBCPP_FUNC_VIS terminate_handler set_terminate(terminate_handler) _NOEXCEPT;

_LIBCPP_FUNC_VIS terminate_handler get_terminate() _NOEXCEPT;

_LIBCPP_NORETURN _LIBCPP_FUNC_VIS void terminate() _NOEXCEPT;

_LIBCPP_FUNC_VIS bool uncaught_exception() _NOEXCEPT;

_LIBCPP_FUNC_VIS _LIBCPP_AVAILABILITY_UNCAUGHT_EXCEPTIONS int uncaught_exceptions() _NOEXCEPT;

class _LIBCPP_TYPE_VIS exception_ptr;

_LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT;

_LIBCPP_NORETURN _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr);

#ifndef _LIBCPP_ABI_MICROSOFT

class _LIBCPP_TYPE_VIS exception_ptr

{

    void* __ptr_;

public:

    _LIBCPP_INLINE_VISIBILITY exception_ptr() _NOEXCEPT : __ptr_() {}

    _LIBCPP_INLINE_VISIBILITY exception_ptr(nullptr_t) _NOEXCEPT : __ptr_() {}

    exception_ptr(const exception_ptr&) _NOEXCEPT;

    exception_ptr& operator=(const exception_ptr&) _NOEXCEPT;

    ~exception_ptr() _NOEXCEPT;

    _LIBCPP_INLINE_VISIBILITY explicit operator bool() const _NOEXCEPT

    {return __ptr_ != nullptr;}

    friend _LIBCPP_INLINE_VISIBILITY

    bool operator==(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT

        {return __x.__ptr_ == __y.__ptr_;}

    friend _LIBCPP_INLINE_VISIBILITY

    bool operator!=(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT

        {return !(__x == __y);}

    friend _LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT;

    friend _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr);

};

template<class _Ep>

_LIBCPP_INLINE_VISIBILITY exception_ptr

make_exception_ptr(_Ep __e) _NOEXCEPT

{

#ifndef _LIBCPP_NO_EXCEPTIONS

    try

    {

        throw __e;

    }

    catch (...)

    {

        return current_exception();

    }

#else

    ((void)__e);

    _VSTD::abort();

#endif

}

#else // _LIBCPP_ABI_MICROSOFT

class _LIBCPP_TYPE_VIS exception_ptr

{

_LIBCPP_DIAGNOSTIC_PUSH

_LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wunused-private-field")

    void* __ptr1_;

    void* __ptr2_;

_LIBCPP_DIAGNOSTIC_POP

public:

    exception_ptr() _NOEXCEPT;

    exception_ptr(nullptr_t) _NOEXCEPT;

    exception_ptr(const exception_ptr& __other) _NOEXCEPT;

    exception_ptr& operator=(const exception_ptr& __other) _NOEXCEPT;

    exception_ptr& operator=(nullptr_t) _NOEXCEPT;

    ~exception_ptr() _NOEXCEPT;

    explicit operator bool() const _NOEXCEPT;

};

_LIBCPP_FUNC_VIS

bool operator==(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT;

inline _LIBCPP_INLINE_VISIBILITY

bool operator!=(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT

    {return !(__x == __y);}

_LIBCPP_FUNC_VIS void swap(exception_ptr&, exception_ptr&) _NOEXCEPT;

_LIBCPP_FUNC_VIS exception_ptr __copy_exception_ptr(void *__except, const void* __ptr);

_LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT;

_LIBCPP_NORETURN _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr);

// This is a built-in template function which automagically extracts the required

// information.

template <class _E> void *__GetExceptionInfo(_E);

template<class _Ep>

_LIBCPP_INLINE_VISIBILITY exception_ptr

make_exception_ptr(_Ep __e) _NOEXCEPT

{

  return __copy_exception_ptr(_VSTD::addressof(__e), __GetExceptionInfo(__e));

}

#endif // _LIBCPP_ABI_MICROSOFT

// nested_exception

class _LIBCPP_EXCEPTION_ABI nested_exception

{

    exception_ptr __ptr_;

public:

    nested_exception() _NOEXCEPT;

//     nested_exception(const nested_exception&) noexcept = default;

//     nested_exception& operator=(const nested_exception&) noexcept = default;

    virtual ~nested_exception() _NOEXCEPT;

    // access functions

    _LIBCPP_NORETURN void rethrow_nested() const;

    _LIBCPP_INLINE_VISIBILITY exception_ptr nested_ptr() const _NOEXCEPT {return __ptr_;}

};

template <class _Tp>

struct __nested

    : public _Tp,

      public nested_exception

{

    _LIBCPP_INLINE_VISIBILITY explicit __nested(const _Tp& __t) : _Tp(__t) {}

};

#ifndef _LIBCPP_NO_EXCEPTIONS

template <class _Tp, class _Up, bool>

struct __throw_with_nested;

template <class _Tp, class _Up>

struct __throw_with_nested<_Tp, _Up, true> {

    _LIBCPP_NORETURN static inline _LIBCPP_INLINE_VISIBILITY void

    __do_throw(_Tp&& __t)

    {

        throw __nested<_Up>(static_cast<_Tp&&>(__t));

    }

};

template <class _Tp, class _Up>

struct __throw_with_nested<_Tp, _Up, false> {

    _LIBCPP_NORETURN static inline _LIBCPP_INLINE_VISIBILITY void

#ifndef _LIBCPP_CXX03_LANG

    __do_throw(_Tp&& __t)

#else

    __do_throw (_Tp& __t)

#endif // _LIBCPP_CXX03_LANG

    {

        throw static_cast<_Tp&&>(__t);

    }

};

#endif

template <class _Tp>

_LIBCPP_NORETURN _LIBCPP_HIDE_FROM_ABI

void

throw_with_nested(_Tp&& __t)

{

#ifndef _LIBCPP_NO_EXCEPTIONS

    typedef typename decay<_Tp>::type _Up;

    static_assert( is_copy_constructible<_Up>::value, "type thrown must be CopyConstructible");

    __throw_with_nested<_Tp, _Up,

        is_class<_Up>::value &&

        !is_base_of<nested_exception, _Up>::value &&

        !__libcpp_is_final<_Up>::value>::

            __do_throw(static_cast<_Tp&&>(__t));

#else

    ((void)__t);

    // FIXME: Make this abort

#endif

}

template <class _From, class _To>

struct __can_dynamic_cast : _BoolConstant<

              is_polymorphic<_From>::value &&

                 (!is_base_of<_To, _From>::value ||

                   is_convertible<const _From*, const _To*>::value)> {};

template <class _Ep>

inline _LIBCPP_INLINE_VISIBILITY

void

rethrow_if_nested(const _Ep& __e,

                  __enable_if_t< __can_dynamic_cast<_Ep, nested_exception>::value>* = 0)

{

    const nested_exception* __nep = dynamic_cast<const nested_exception*>(_VSTD::addressof(__e));

    if (__nep)

        __nep->rethrow_nested();

}

template <class _Ep>

inline _LIBCPP_INLINE_VISIBILITY

void

rethrow_if_nested(const _Ep&,

                  __enable_if_t<!__can_dynamic_cast<_Ep, nested_exception>::value>* = 0)

{

}

} // namespace std

#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20

#  include <type_traits>

#endif

#endif // _LIBCPP_EXCEPTION