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Diffstat (limited to 'ext/systemc/src/sysc/datatypes/fx/sc_context.h')
| -rw-r--r-- | ext/systemc/src/sysc/datatypes/fx/sc_context.h | 316 |
1 files changed, 316 insertions, 0 deletions
diff --git a/ext/systemc/src/sysc/datatypes/fx/sc_context.h b/ext/systemc/src/sysc/datatypes/fx/sc_context.h new file mode 100644 index 000000000..1e313a486 --- /dev/null +++ b/ext/systemc/src/sysc/datatypes/fx/sc_context.h @@ -0,0 +1,316 @@ +/***************************************************************************** + + Licensed to Accellera Systems Initiative Inc. (Accellera) under one or + more contributor license agreements. See the NOTICE file distributed + with this work for additional information regarding copyright ownership. + Accellera licenses this file to you under the Apache License, Version 2.0 + (the "License"); you may not use this file except in compliance with the + License. You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or + implied. See the License for the specific language governing + permissions and limitations under the License. + + *****************************************************************************/ + +/***************************************************************************** + + sc_context.h - + + Original Author: Martin Janssen, Synopsys, Inc. + + *****************************************************************************/ + +/***************************************************************************** + + MODIFICATION LOG - modifiers, enter your name, affiliation, date and + changes you are making here. + + Name, Affiliation, Date: + Description of Modification: + + *****************************************************************************/ + +// $Log: sc_context.h,v $ +// Revision 1.2 2011/08/24 22:05:43 acg +// Torsten Maehne: initialization changes to remove warnings. +// +// Revision 1.1.1.1 2006/12/15 20:20:04 acg +// SystemC 2.3 +// +// Revision 1.5 2006/05/26 20:36:52 acg +// Andy Goodrich: added a using for sc_core::default_ptr_hash_fn to keep HP +// aCC happy. +// +// Revision 1.4 2006/03/21 00:00:31 acg +// Andy Goodrich: changed name of sc_get_current_process_base() to be +// sc_get_current_process_b() since its returning an sc_process_b instance. +// +// Revision 1.3 2006/01/13 18:53:57 acg +// Andy Goodrich: added $Log command so that CVS comments are reproduced in +// the source. +// + +#ifndef SC_CONTEXT_H +#define SC_CONTEXT_H + + +#include "sysc/datatypes/fx/sc_fx_ids.h" +#include "sysc/kernel/sc_simcontext.h" +#include "sysc/utils/sc_hash.h" + + +namespace sc_core { + class sc_process_b; +} + +using sc_core::default_ptr_hash_fn; // To keep HP aCC happy. + +namespace sc_dt +{ + +// classes defined in this module +class sc_without_context; +template <class T> class sc_global; +template <class T> class sc_context; + + +// ---------------------------------------------------------------------------- +// CLASS : sc_without_context +// +// Empty class that is used for its type only. +// ---------------------------------------------------------------------------- + +class sc_without_context {}; + + +// ---------------------------------------------------------------------------- +// TEMPLATE CLASS : sc_global +// +// Template global variable class; singleton; co-routine safe. +// ---------------------------------------------------------------------------- + +template <class T> +class sc_global +{ + + sc_global(); + + void update(); + +public: + + static sc_global<T>* instance(); + + const T*& value_ptr(); + +private: + static sc_global<T>* m_instance; + + sc_core::sc_phash<void*,const T*> m_map; + void* m_proc; // context (current process or NULL) + const T* m_value_ptr; + +}; + + +// ---------------------------------------------------------------------------- +// ENUM : sc_context_begin +// +// Enumeration of context begin options. +// ---------------------------------------------------------------------------- + +enum sc_context_begin +{ + SC_NOW, + SC_LATER +}; + + +// ---------------------------------------------------------------------------- +// CLASS : sc_context +// +// Template context class; co-routine safe. +// ---------------------------------------------------------------------------- + +template <class T> +class sc_context +{ + // disabled + sc_context( const sc_context<T>& ); + void* operator new( std::size_t ); + +public: + + explicit sc_context( const T&, sc_context_begin = SC_NOW ); + ~sc_context(); + + void begin(); + void end(); + + static const T& default_value(); + const T& value() const; + +private: + + const T m_value; + const T*& m_def_value_ptr; + const T* m_old_value_ptr; +}; + + +// IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII + +// ---------------------------------------------------------------------------- +// TEMPLATE CLASS : sc_global +// +// Template global variable class; singleton; co-routine safe. +// ---------------------------------------------------------------------------- + +template <class T> +sc_global<T>* sc_global<T>::m_instance = 0; + +template <class T> +inline +sc_global<T>::sc_global() + : m_map() + // use &m_instance as unique "non-process" key (NULL denotes 'sc_main' context) + , m_proc( &m_instance ) + , m_value_ptr( 0 ) +{} + + +template <class T> +inline +void +sc_global<T>::update() +{ + void* p = sc_core::sc_get_current_process_b(); + if( p != m_proc ) + { + const T* vp = m_map[p]; + if( vp == 0 ) + { + vp = new T( sc_without_context() ); + m_map.insert( p, vp ); + } + m_proc = p; + m_value_ptr = vp; + } +} + + +template <class T> +inline +sc_global<T>* +sc_global<T>::instance() +{ + if( m_instance == 0 ) + { + m_instance = new sc_global<T>; + } + return m_instance; +} + + +template <class T> +inline +const T*& +sc_global<T>::value_ptr() +{ + update(); + return m_value_ptr; +} + + +// ---------------------------------------------------------------------------- +// CLASS : sc_context +// +// Template context class; co-routine safe. +// ---------------------------------------------------------------------------- + +template <class T> +inline +sc_context<T>::sc_context( const T& value_, sc_context_begin begin ) +: m_value( value_ ), + m_def_value_ptr( sc_global<T>::instance()->value_ptr() ), + m_old_value_ptr( 0 ) +{ + if( begin == SC_NOW ) + { + m_old_value_ptr = m_def_value_ptr; + m_def_value_ptr = &m_value; + } +} + +template <class T> +inline +sc_context<T>::~sc_context() +{ + if( m_old_value_ptr != 0 ) + { + m_def_value_ptr = m_old_value_ptr; + m_old_value_ptr = 0; + } +} + + +template <class T> +inline +void +sc_context<T>::begin() +{ + if( m_old_value_ptr == 0 ) + { + m_old_value_ptr = m_def_value_ptr; + m_def_value_ptr = &m_value; + } + else + { + SC_REPORT_ERROR( sc_core::SC_ID_CONTEXT_BEGIN_FAILED_, 0 ); + } +} + +template <class T> +inline +void +sc_context<T>::end() +{ + if( m_old_value_ptr != 0 ) + { + m_def_value_ptr = m_old_value_ptr; + m_old_value_ptr = 0; + } + else + { + SC_REPORT_ERROR( sc_core::SC_ID_CONTEXT_END_FAILED_, 0 ); + } +} + + +template <class T> +inline +const T& +sc_context<T>::default_value() +{ + return *sc_global<T>::instance()->value_ptr(); +} + +template <class T> +inline +const T& +sc_context<T>::value() const +{ + return m_value; +} + +} // namespace sc_dt + + +#endif + +// Taf! |