sc_module_name.h

system C源码 一种替代verilog的语言

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

  The following code is derived, directly or indirectly, from the SystemC
  source code Copyright (c) 1996-2006 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 Version 2.4 (the "License");
  You may not use this file except in compliance with such restrictions and
  limitations. You may obtain instructions on how to receive a copy of the
  License at http://www.systemc.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
  language governing rights and limitations under the License.

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

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

  sc_module_name.h -- An object used to help manage object names 
                      and hierarchy.

  Original Author: Stan Y. Liao, Synopsys, Inc.

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

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

  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
  changes you are making here.

      Name, Affiliation, Date:
  Description of Modification:

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

// $Log: sc_module_name.h,v $
// Revision 1.1.1.1  2006/12/15 20:31:37  acg
// SystemC 2.2
//
// Revision 1.4  2006/03/14 23:56:58  acg
//   Andy Goodrich: This fixes a bug when an exception is thrown in
//   sc_module::sc_module() for a dynamically allocated sc_module
//   object. We are calling sc_module::end_module() on a module that has
//   already been deleted. The scenario runs like this:
//
//   a) the sc_module constructor is entered
//   b) the exception is thrown
//   c) the exception processor deletes the storage for the sc_module
//   d) the stack is unrolled causing the sc_module_name instance to be deleted
//   e) ~sc_module_name() calls end_module() with its pointer to the sc_module
//   f) because the sc_module has been deleted its storage is corrupted,
//      either by linking it to a free space chain, or by reuse of some sort
//   g) the m_simc field is garbage
//   h) the m_object_manager field is also garbage
//   i) an exception occurs
//
//   This does not happen for automatic sc_module instances since the
//   storage for the module is not reclaimed its just part of the stack.
//
//   I am fixing this by having the destructor for sc_module clear the
//   module pointer in its sc_module_name instance. That cuts things at
//   step (e) above, since the pointer will be null if the module has
//   already been deleted. To make sure the module stack is okay, I call
//   end-module() in ~sc_module in the case where there is an
//   sc_module_name pointer lying around.
//
// Revision 1.3  2006/01/13 18:44:30  acg
// Added $Log to record CVS changes into the source.
//

#ifndef SC_MODULE_NAME_H
#define SC_MODULE_NAME_H


namespace sc_core {

class sc_module;
class sc_simcontext;


// ----------------------------------------------------------------------------
//  CLASS : sc_module_name
//
//  Module name class.
// ----------------------------------------------------------------------------

class sc_module_name
{
    friend class sc_module;
    friend class sc_object_manager;

public:

    sc_module_name( const char* );
    sc_module_name( const sc_module_name& );

    ~sc_module_name();

    operator const char*() const;

protected:
    inline void clear_module( sc_module* module_p );
    inline void set_module( sc_module* module_p );

private:

    const char*     m_name;
    sc_module*      m_module_p;
    sc_module_name* m_next;
    sc_simcontext*  m_simc;
    bool            m_pushed;

private:

    // disabled
    sc_module_name();
    sc_module_name& operator = ( const sc_module_name& );
};

inline void sc_module_name::clear_module( sc_module* module_p )
{
    assert( m_module_p == module_p );
    m_module_p = 0;
}

inline void sc_module_name::set_module( sc_module* module_p )
{
    m_module_p = module_p;
}

} // namespace sc_core

#endif