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+/*****************************************************************************
+
+ 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 __SYSTEMC_EXT_DT_FX_SC_CONTEXT_HH__
+#define __SYSTEMC_EXT_DT_FX_SC_CONTEXT_HH__
+
+#include <map>
+
+#include "../../core/sc_process_handle.hh"
+#include "../../utils/sc_report_handler.hh"
+
+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;
+
+ std::map<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:
+ sc_context &operator = (const sc_context &) /* = delete */;
+
+ 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_gem5::Process *)sc_core::sc_get_current_process_handle();
+ if (p != m_proc) {
+ const T *vp = m_map[p];
+ if (vp == 0) {
+ vp = new T(sc_without_context());
+ m_map.emplace(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("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("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 // __SYSTEMC_EXT_DT_FX_SC_CONTEXT_HH__
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