sc_method_process.h

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  The following code is derived, directly or indirectly, from the SystemC
  source code Copyright (c) 1996-2014 by all Contributors.
  All Rights reserved.

  The contents of this file are subject to the restrictions and limitations
  set forth in the SystemC Open Source License (the "License");
  You may not use this file except in compliance with such restrictions and
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  License at http://www.accellera.org/. Software distributed by Contributors
  under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF
  ANY KIND, either express or implied. See the License for the specific
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 *****************************************************************************/

/*****************************************************************************

  sc_method_process.h -- Method process declarations

  Original Author: Andy Goodrich, Forte Design Systems, 4 August 2005
               

  CHANGE LOG AT THE END OF THE FILE
 *****************************************************************************/

// $Log: sc_method_process.h,v $
// Revision 1.23  2011/09/05 21:20:22  acg
//  Andy Goodrich: result of automake invocation.
//
// Revision 1.22  2011/08/29 18:04:32  acg
//  Philipp A. Hartmann: miscellaneous clean ups.
//
// Revision 1.21  2011/08/26 20:46:10  acg
//  Andy Goodrich: moved the modification log to the end of the file to
//  eliminate source line number skew when check-ins are done.
//

#if !defined(sc_method_process_h_INCLUDED)
#define sc_method_process_h_INCLUDED

#include "sysc/kernel/sc_process.h"
#include "sysc/kernel/sc_spawn_options.h"
#include "sysc/kernel/sc_cor.h"
#include "sysc/kernel/sc_event.h"
#include "sysc/kernel/sc_except.h"


// DEBUGGING MACROS:
//
// DEBUG_MSG(NAME,P,MSG)
//     MSG  = message to print
//     NAME = name that must match the process for the message to print, or
//            null if the message should be printed unconditionally.
//     P    = pointer to process message is for, or NULL in which case the
//            message will not print.
#if 0
#   define DEBUG_NAME ""
#   define DEBUG_MSG(NAME,P,MSG) \
    { \
        if ( P && ( (strlen(NAME)==0) || !strcmp(NAME,P->name())) ) \
          std::cout << "**** " << sc_time_stamp() << " ("  \
                    << sc_get_current_process_name() << "): " << MSG \
                    << " - " << P->name() << std::endl; \
    }
#else
#   define DEBUG_MSG(NAME,P,MSG) 
#endif


namespace sc_core {

// forward function and class declarations:

void sc_method_cor_fn( void* );
void sc_cmethod_cor_fn( void* );
void sc_set_stack_size( sc_method_handle, std::size_t );
class sc_event;
class sc_module;
class sc_process_table;
class sc_process_handle;
class sc_simcontext;
class sc_runnable;

void next_trigger( sc_simcontext* );
void next_trigger( const sc_event&, sc_simcontext* );
void next_trigger( const sc_event_or_list&, sc_simcontext* );
void next_trigger( const sc_event_and_list&, sc_simcontext* );
void next_trigger( const sc_time&, sc_simcontext* );
void next_trigger( const sc_time&, const sc_event&, sc_simcontext* );
void next_trigger( const sc_time&, const sc_event_or_list&, sc_simcontext* );
void next_trigger( const sc_time&, const sc_event_and_list&, sc_simcontext* );

struct sc_invoke_method; 
//==============================================================================
// sc_method_process -
//
//==============================================================================
class sc_method_process : public sc_process_b {
    friend struct sc_invoke_method; 
    friend void sc_method_cor_fn( void* );
    friend void sc_cmethod_cor_fn( void* );
    friend void sc_set_stack_size( sc_method_handle, std::size_t );
    friend class sc_event;
    friend class sc_module;
    friend class sc_process_table;
    friend class sc_process_handle;
    friend class sc_simcontext;
    friend class sc_runnable;

    friend void next_trigger( sc_simcontext* );
    friend void next_trigger( const sc_event&,
                  sc_simcontext* );
    friend void next_trigger( const sc_event_or_list&,
                  sc_simcontext* );
    friend void next_trigger( const sc_event_and_list&,
                  sc_simcontext* );
    friend void next_trigger( const sc_time&,
                  sc_simcontext* );
    friend void next_trigger( const sc_time&, const sc_event&,
                  sc_simcontext* );
    friend void next_trigger( const sc_time&, const sc_event_or_list&,
                  sc_simcontext* );
    friend void next_trigger( const sc_time&, const sc_event_and_list&,
                  sc_simcontext* );

  public:
    sc_method_process( const char* name_p, bool free_host,
        SC_ENTRY_FUNC method_p, sc_process_host* host_p, 
        const sc_spawn_options* opt_p );

    virtual const char* kind() const
        { return "sc_method_process"; }

  protected:
    void check_for_throws();
    virtual void disable_process(
        sc_descendant_inclusion_info descendants = SC_NO_DESCENDANTS );
    virtual void enable_process(
        sc_descendant_inclusion_info descendants = SC_NO_DESCENDANTS );
    inline bool run_process();
    virtual void kill_process(
        sc_descendant_inclusion_info descendants = SC_NO_DESCENDANTS );
    sc_method_handle next_exist();
    sc_method_handle next_runnable();
    void clear_trigger();
    void next_trigger( const sc_event& );
    void next_trigger( const sc_event_or_list& );
    void next_trigger( const sc_event_and_list& );
    void next_trigger( const sc_time& );
    void next_trigger( const sc_time&, const sc_event& );
    void next_trigger( const sc_time&, const sc_event_or_list& );
    void next_trigger( const sc_time&, const sc_event_and_list& );
    virtual void resume_process(
        sc_descendant_inclusion_info descendants = SC_NO_DESCENDANTS );
    void set_next_exist( sc_method_handle next_p );
    void set_next_runnable( sc_method_handle next_p );
    void set_stack_size( std::size_t size );
    virtual void suspend_process( 
        sc_descendant_inclusion_info descendants = SC_NO_DESCENDANTS );
    virtual void throw_reset( bool async );
    virtual void throw_user( const sc_throw_it_helper& helper,
        sc_descendant_inclusion_info descendants = SC_NO_DESCENDANTS );
    bool trigger_dynamic( sc_event* );
    inline void trigger_static();

  protected:
    sc_cor*                          m_cor;        // Thread's coroutine.
    std::size_t                      m_stack_size; // Thread stack size.
    std::vector<sc_process_monitor*> m_monitor_q;  // Thread monitors.

  private:
    // may not be deleted manually (called from sc_process_b)
    virtual ~sc_method_process();

  private: // disabled
    sc_method_process( const sc_method_process& );
    const sc_method_process& operator = ( const sc_method_process& );

};

inline
void
sc_method_process::next_trigger( const sc_event& e )
{
    clear_trigger();
    e.add_dynamic( this );
    m_event_p = &e;
    m_trigger_type = EVENT;
}

inline
void
sc_method_process::next_trigger( const sc_event_or_list& el )
{
    clear_trigger();
    el.add_dynamic( this );
    m_event_list_p = &el;
    m_trigger_type = OR_LIST;
}

inline
void
sc_method_process::next_trigger( const sc_event_and_list& el )
{
    clear_trigger();
    el.add_dynamic( this );
    m_event_list_p = &el;
    m_event_count = el.size();
    m_trigger_type = AND_LIST;
}

inline
void
sc_method_process::next_trigger( const sc_time& t )
{
    clear_trigger();
    m_timeout_event_p->notify_internal( t );
    m_timeout_event_p->add_dynamic( this );
    m_trigger_type = TIMEOUT;
}

inline
void
sc_method_process::next_trigger( const sc_time& t, const sc_event& e )
{
    clear_trigger();
    m_timeout_event_p->notify_internal( t );
    m_timeout_event_p->add_dynamic( this );
    e.add_dynamic( this );
    m_event_p = &e;
    m_trigger_type = EVENT_TIMEOUT;
}

inline
void
sc_method_process::next_trigger( const sc_time& t, const sc_event_or_list& el )
{
    clear_trigger();
    m_timeout_event_p->notify_internal( t );
    m_timeout_event_p->add_dynamic( this );
    el.add_dynamic( this );
    m_event_list_p = &el;
    m_trigger_type = OR_LIST_TIMEOUT;
}

inline
void
sc_method_process::next_trigger( const sc_time& t, const sc_event_and_list& el )
{
    clear_trigger();
    m_timeout_event_p->notify_internal( t );
    m_timeout_event_p->add_dynamic( this );
    el.add_dynamic( this );
    m_event_list_p = &el;
    m_event_count = el.size();
    m_trigger_type = AND_LIST_TIMEOUT;
}

inline
void sc_method_process::set_next_exist(sc_method_handle next_p)
{
    m_exist_p = next_p;
}

inline
sc_method_handle sc_method_process::next_exist()
{
    return (sc_method_handle)m_exist_p;
}


inline
void sc_method_process::set_next_runnable(sc_method_handle next_p)
{
    m_runnable_p = next_p;
}

inline
sc_method_handle sc_method_process::next_runnable()
{
    return (sc_method_handle)m_runnable_p;
}

// +----------------------------------------------------------------------------
// |"sc_method_process::run_process"
// | 
// | This method executes this object instance, including fielding exceptions.
// |
// | Result is false if an unfielded exception occurred, true if not.
// +----------------------------------------------------------------------------
inline bool sc_method_process::run_process()
{
    // Execute this object instance's semantics and catch any exceptions that
    // are generated:

    bool restart = false;
    do {
        try {
            DEBUG_MSG(DEBUG_NAME,this,"executing method semantics");
            semantics();
            restart = false;
        }
        catch( sc_unwind_exception& ex ) {
            DEBUG_MSG(DEBUG_NAME,this,"caught unwind exception");
            ex.clear();
            restart = ex.is_reset();
        }
        catch( ... ) {
            sc_report* err_p = sc_handle_exception();
            simcontext()->set_error( err_p );
            return false;
        }
    } while( restart );

    return true;
}

//------------------------------------------------------------------------------
//"sc_method_process::trigger_static"
//
// This inline method adds the current method to the queue of runnable
// processes, if required.  This is the case if the following criteria
// are met:
//   (1) The process is in a runnable state.
//   (2) The process is not already on the run queue.
//   (3) The process is expecting a static trigger, 
//       dynamic event waits take priority.
//
//
// If the triggering process is the same process, the trigger is
// ignored as well, unless SC_ENABLE_IMMEDIATE_SELF_NOTIFICATIONS
// is defined.
//------------------------------------------------------------------------------
inline
void
sc_method_process::trigger_static()
{
    if ( (m_state & ps_bit_disabled) || is_runnable() ||
          m_trigger_type != STATIC )
        return;

#if ! defined( SC_ENABLE_IMMEDIATE_SELF_NOTIFICATIONS )
    if( SC_UNLIKELY_( sc_get_current_process_b() == this ) )
    {
        report_immediate_self_notification();
        return;
    }
#endif // SC_ENABLE_IMMEDIATE_SELF_NOTIFICATIONS

    // If we get here then the method is has satisfied its wait, if its 
    // suspended mark its state as ready to run. If its not suspended then 
    // push it onto the runnable queue.

    if ( m_state & ps_bit_suspended )
    {
        m_state = m_state | ps_bit_ready_to_run;
    }
    else
    {
        simcontext()->push_runnable_method(this);
    }
}

#undef DEBUG_MSG

} // namespace sc_core 

// Revision 1.20  2011/08/24 22:05:50  acg
//  Torsten Maehne: initialization changes to remove warnings.
//
// Revision 1.19  2011/07/29 22:43:15  acg
//  Andy Goodrich: addition of check_for_throws() method.
//
// Revision 1.18  2011/07/24 11:18:09  acg
//  Philipp A. Hartmann: add code to restart a method process after a
//  self-reset.
//
// Revision 1.17  2011/05/09 04:07:48  acg
//  Philipp A. Hartmann:
//    (1) Restore hierarchy in all phase callbacks.
//    (2) Ensure calls to before_end_of_elaboration.
//
// Revision 1.16  2011/04/13 02:41:34  acg
//  Andy Goodrich: eliminate warning messages generated when the DEBUG_MSG
//  macro is used.
//
// Revision 1.15  2011/04/10 22:12:32  acg
//  Andy Goodrich: adding debugging macros.
//
// Revision 1.14  2011/04/08 22:31:21  acg
//  Andy Goodrich: added new inline method run_process() to hide the process
//  implementation for sc_simcontext.
//
// Revision 1.13  2011/04/05 20:50:56  acg
//  Andy Goodrich:
//    (1) changes to make sure that event(), posedge() and negedge() only
//        return true if the clock has not moved.
//    (2) fixes for method self-resumes.
//    (3) added SC_PRERELEASE_VERSION
//    (4) removed kernel events from the object hierarchy, added
//        sc_hierarchy_name_exists().
//
// Revision 1.12  2011/04/01 21:24:57  acg
//  Andy Goodrich: removed unused code.
//
// Revision 1.11  2011/02/19 08:30:53  acg
//  Andy Goodrich: Moved process queueing into trigger_static from
//  sc_event::notify.
//
// Revision 1.10  2011/02/18 20:27:14  acg
//  Andy Goodrich: Updated Copyrights.
//
// Revision 1.9  2011/02/17 19:51:34  acg
//  Andy Goodrich:
//    (1) Changed the signature of trigger_dynamic back to a bool.
//    (2) Removed ready_to_run().
//    (3) Simplified process control usage.
//
// Revision 1.8  2011/02/16 22:37:30  acg
//  Andy Goodrich: clean up to remove need for ps_disable_pending.
//
// Revision 1.7  2011/02/13 21:47:37  acg
//  Andy Goodrich: update copyright notice.
//
// Revision 1.6  2011/02/01 21:05:05  acg
//  Andy Goodrich: Changes in trigger_dynamic methods to handle new
//  process control rules about event sensitivity.
//
// Revision 1.5  2011/01/18 20:10:44  acg
//  Andy Goodrich: changes for IEEE1666_2011 semantics.
//
// Revision 1.4  2009/07/28 01:10:53  acg
//  Andy Goodrich: updates for 2.3 release candidate.
//
// Revision 1.3  2009/05/22 16:06:29  acg
//  Andy Goodrich: process control updates.
//
// Revision 1.2  2008/05/22 17:06:25  acg
//  Andy Goodrich: updated copyright notice to include 2008.
//
// Revision 1.1.1.1  2006/12/15 20:20:05  acg
// SystemC 2.3
//
// Revision 1.7  2006/05/08 17:57:13  acg
//  Andy Goodrich: Added David Long's forward declarations for friend functions
//  to keep the Microsoft C++ compiler happy.
//
// Revision 1.6  2006/04/20 17:08:17  acg
//  Andy Goodrich: 3.0 style process changes.
//
// Revision 1.5  2006/04/11 23:13:21  acg
//   Andy Goodrich: Changes for reduced reset support that only includes
//   sc_cthread, but has preliminary hooks for expanding to method and thread
//   processes also.
//
// Revision 1.4  2006/01/24 20:49:05  acg
// Andy Goodrich: changes to remove the use of deprecated features within the
// simulator, and to issue warning messages when deprecated features are used.
//
// Revision 1.3  2006/01/13 18:44:29  acg
// Added $Log to record CVS changes into the source.

#endif // !defined(sc_method_process_h_INCLUDED)