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// Copyright Oliver Kowalke 2009.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_COROUTINES_DETAIL_PULL_COROUTINE_IMPL_H
#define BOOST_COROUTINES_DETAIL_PULL_COROUTINE_IMPL_H
#include <boost/assert.hpp>
#include <boost/config.hpp>
#include <boost/exception_ptr.hpp>
#include <boost/throw_exception.hpp>
#include <boost/utility.hpp>
#include <boost/coroutine/detail/config.hpp>
#include <boost/coroutine/detail/coroutine_context.hpp>
#include <boost/coroutine/detail/flags.hpp>
#include <boost/coroutine/detail/parameters.hpp>
#include <boost/coroutine/detail/trampoline_pull.hpp>
#include <boost/coroutine/exceptions.hpp>
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_PREFIX
#endif
namespace boost {
namespace coroutines {
struct stack_context;
namespace detail {
template< typename R >
class pull_coroutine_impl : private noncopyable
{
protected:
int flags_;
exception_ptr except_;
coroutine_context * caller_;
coroutine_context * callee_;
R * result_;
public:
typedef parameters< R > param_type;
pull_coroutine_impl( coroutine_context * caller,
coroutine_context * callee,
bool unwind, bool preserve_fpu) :
flags_( 0),
except_(),
caller_( caller),
callee_( callee),
result_( 0)
{
if ( unwind) flags_ |= flag_force_unwind;
if ( preserve_fpu) flags_ |= flag_preserve_fpu;
}
pull_coroutine_impl( coroutine_context * caller,
coroutine_context * callee,
bool unwind, bool preserve_fpu,
R * result) :
flags_( 0),
except_(),
caller_( caller),
callee_( callee),
result_( result)
{
if ( unwind) flags_ |= flag_force_unwind;
if ( preserve_fpu) flags_ |= flag_preserve_fpu;
}
virtual ~pull_coroutine_impl() {}
bool force_unwind() const BOOST_NOEXCEPT
{ return 0 != ( flags_ & flag_force_unwind); }
bool unwind_requested() const BOOST_NOEXCEPT
{ return 0 != ( flags_ & flag_unwind_stack); }
bool preserve_fpu() const BOOST_NOEXCEPT
{ return 0 != ( flags_ & flag_preserve_fpu); }
bool is_started() const BOOST_NOEXCEPT
{ return 0 != ( flags_ & flag_started); }
bool is_running() const BOOST_NOEXCEPT
{ return 0 != ( flags_ & flag_running); }
bool is_complete() const BOOST_NOEXCEPT
{ return 0 != ( flags_ & flag_complete); }
void unwind_stack() BOOST_NOEXCEPT
{
if ( is_started() && ! is_complete() && force_unwind() )
{
flags_ |= flag_unwind_stack;
param_type to( unwind_t::force_unwind);
caller_->jump(
* callee_,
reinterpret_cast< intptr_t >( & to),
preserve_fpu() );
flags_ &= ~flag_unwind_stack;
BOOST_ASSERT( is_complete() );
}
}
void pull()
{
BOOST_ASSERT( ! is_running() );
BOOST_ASSERT( ! is_complete() );
flags_ |= flag_running;
param_type to( this);
param_type * from(
reinterpret_cast< param_type * >(
caller_->jump(
* callee_,
reinterpret_cast< intptr_t >( & to),
preserve_fpu() ) ) );
flags_ &= ~flag_running;
result_ = from->data;
if ( from->do_unwind) throw forced_unwind();
if ( except_) rethrow_exception( except_);
}
bool has_result() const
{ return 0 != result_; }
R get() const
{
if ( ! has_result() )
boost::throw_exception(
invalid_result() );
return * result_;
}
R * get_pointer() const
{
if ( ! has_result() )
boost::throw_exception(
invalid_result() );
return result_;
}
virtual void destroy() = 0;
};
template< typename R >
class pull_coroutine_impl< R & > : private noncopyable
{
protected:
int flags_;
exception_ptr except_;
coroutine_context * caller_;
coroutine_context * callee_;
R * result_;
public:
typedef parameters< R & > param_type;
pull_coroutine_impl( coroutine_context * caller,
coroutine_context * callee,
bool unwind, bool preserve_fpu) :
flags_( 0),
except_(),
caller_( caller),
callee_( callee),
result_( 0)
{
if ( unwind) flags_ |= flag_force_unwind;
if ( preserve_fpu) flags_ |= flag_preserve_fpu;
}
pull_coroutine_impl( coroutine_context * caller,
coroutine_context * callee,
bool unwind, bool preserve_fpu,
R * result) :
flags_( 0),
except_(),
caller_( caller),
callee_( callee),
result_( result)
{
if ( unwind) flags_ |= flag_force_unwind;
if ( preserve_fpu) flags_ |= flag_preserve_fpu;
}
virtual ~pull_coroutine_impl() {}
bool force_unwind() const BOOST_NOEXCEPT
{ return 0 != ( flags_ & flag_force_unwind); }
bool unwind_requested() const BOOST_NOEXCEPT
{ return 0 != ( flags_ & flag_unwind_stack); }
bool preserve_fpu() const BOOST_NOEXCEPT
{ return 0 != ( flags_ & flag_preserve_fpu); }
bool is_started() const BOOST_NOEXCEPT
{ return 0 != ( flags_ & flag_started); }
bool is_running() const BOOST_NOEXCEPT
{ return 0 != ( flags_ & flag_running); }
bool is_complete() const BOOST_NOEXCEPT
{ return 0 != ( flags_ & flag_complete); }
void unwind_stack() BOOST_NOEXCEPT
{
if ( is_started() && ! is_complete() && force_unwind() )
{
flags_ |= flag_unwind_stack;
param_type to( unwind_t::force_unwind);
caller_->jump(
* callee_,
reinterpret_cast< intptr_t >( & to),
preserve_fpu() );
flags_ &= ~flag_unwind_stack;
BOOST_ASSERT( is_complete() );
}
}
void pull()
{
BOOST_ASSERT( ! is_running() );
BOOST_ASSERT( ! is_complete() );
flags_ |= flag_running;
param_type to( this);
param_type * from(
reinterpret_cast< param_type * >(
caller_->jump(
* callee_,
reinterpret_cast< intptr_t >( & to),
preserve_fpu() ) ) );
flags_ &= ~flag_running;
result_ = from->data;
if ( from->do_unwind) throw forced_unwind();
if ( except_) rethrow_exception( except_);
}
bool has_result() const
{ return 0 != result_; }
R & get() const
{
if ( ! has_result() )
boost::throw_exception(
invalid_result() );
return * result_;
}
R * get_pointer() const
{
if ( ! has_result() )
boost::throw_exception(
invalid_result() );
return result_;
}
virtual void destroy() = 0;
};
template<>
class pull_coroutine_impl< void > : private noncopyable
{
protected:
int flags_;
exception_ptr except_;
coroutine_context * caller_;
coroutine_context * callee_;
public:
typedef parameters< void > param_type;
pull_coroutine_impl( coroutine_context * caller,
coroutine_context * callee,
bool unwind, bool preserve_fpu) :
flags_( 0),
except_(),
caller_( caller),
callee_( callee)
{
if ( unwind) flags_ |= flag_force_unwind;
if ( preserve_fpu) flags_ |= flag_preserve_fpu;
}
virtual ~pull_coroutine_impl() {}
inline bool force_unwind() const BOOST_NOEXCEPT
{ return 0 != ( flags_ & flag_force_unwind); }
inline bool unwind_requested() const BOOST_NOEXCEPT
{ return 0 != ( flags_ & flag_unwind_stack); }
inline bool preserve_fpu() const BOOST_NOEXCEPT
{ return 0 != ( flags_ & flag_preserve_fpu); }
inline bool is_started() const BOOST_NOEXCEPT
{ return 0 != ( flags_ & flag_started); }
inline bool is_running() const BOOST_NOEXCEPT
{ return 0 != ( flags_ & flag_running); }
inline bool is_complete() const BOOST_NOEXCEPT
{ return 0 != ( flags_ & flag_complete); }
inline void unwind_stack() BOOST_NOEXCEPT
{
if ( is_started() && ! is_complete() && force_unwind() )
{
flags_ |= flag_unwind_stack;
param_type to( unwind_t::force_unwind);
caller_->jump(
* callee_,
reinterpret_cast< intptr_t >( & to),
preserve_fpu() );
flags_ &= ~flag_unwind_stack;
BOOST_ASSERT( is_complete() );
}
}
inline void pull()
{
BOOST_ASSERT( ! is_running() );
BOOST_ASSERT( ! is_complete() );
flags_ |= flag_running;
param_type to( this);
param_type * from(
reinterpret_cast< param_type * >(
caller_->jump(
* callee_,
reinterpret_cast< intptr_t >( & to),
preserve_fpu() ) ) );
flags_ &= ~flag_running;
if ( from->do_unwind) throw forced_unwind();
if ( except_) rethrow_exception( except_);
}
virtual void destroy() = 0;
};
}}}
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_SUFFIX
#endif
#endif // BOOST_COROUTINES_DETAIL_PULL_COROUTINE_IMPL_H
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