ext: Include SystemC 2.3.1 into gem5

In the past it happened several times that some changes in gem5 broke the
SystemC coupling. Recently Accelera has changed the licence for SystemC
from their own licence to Apache2.0, which is compatible with gem5.
However, SystemC usually relies on the Boost library, but I was able to
exchange the boost calls by c++11 alternatives. The recent SystemC version
is placed into /ext and is integrated into gem5's build system. The goal is
to integrate some SystemC tests for the CI in some following patches.

Change-Id: I4b66ec806b5e3cffc1d7c85d3735ff4fa5b31fd0
Reviewed-on: https://gem5-review.googlesource.com/2240
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>

1 files changed, 140 insertions, 0 deletions

diff --git a/ext/systemc/src/sysc/tracing/sc_trace_file_base.h b/ext/systemc/src/sysc/tracing/sc_trace_file_base.h
new file mode 100644
index 000000000..c0217266f
--- /dev/null
+++ b/ext/systemc/src/sysc/tracing/sc_trace_file_base.h
@@ -0,0 +1,140 @@
+/*****************************************************************************
+
+  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_trace_file_base.h - Shared internal tracing implementation
+
+  Original Author: Philipp A. Hartmann, OFFIS, 2013-11-15
+
+  CHANGE LOG AT END OF FILE
+ *****************************************************************************/
+
+/*****************************************************************************
+
+   Acknowledgement: The tracing mechanism is based on the tracing
+   mechanism developed at Infineon (formerly Siemens HL). Though this
+   code is somewhat different, and significantly enhanced, the basics
+   are identical to what was originally contributed by Infineon.  The
+   contribution of Infineon in the development of this tracing
+   technology is hereby acknowledged.
+
+ *****************************************************************************/
+
+#ifndef SC_TRACE_FILE_BASE_H_INCLUDED_
+#define SC_TRACE_FILE_BASE_H_INCLUDED_
+
+#include <cstdio>
+
+// use callback-based tracing implementation
+#if defined( SC_ENABLE_SIMULATION_PHASE_CALLBACKS_TRACING )
+#  define SC_TRACING_PHASE_CALLBACKS_ 1
+#  include "sysc/kernel/sc_object.h"
+#else
+#  define SC_TRACING_PHASE_CALLBACKS_ 0
+#endif
+
+#include "sysc/tracing/sc_trace.h"
+#include "sysc/tracing/sc_tracing_ids.h"
+
+namespace sc_core {
+
+// shared implementation of trace files
+class sc_trace_file_base
+  : public sc_trace_file
+#if SC_TRACING_PHASE_CALLBACKS_
+  , private sc_object // to be used as callback target
+#endif
+{
+public:
+    const char* filename() const
+      { return filename_.c_str(); }
+
+    bool delta_cycles() const
+      { return trace_delta_cycles_; }
+
+    // Also trace transitions between delta cycles if flag is true.
+    virtual void delta_cycles(bool flag);
+
+    // set a user-define timescale unit for the trace file
+    virtual void set_time_unit( double v, sc_time_unit tu);
+
+protected:
+    sc_trace_file_base( const char* name, const char* extension );
+
+    // returns true, iff initialization has been performed
+    bool initialize();
+    // ensure that file has been opened (needed for early write_comment())
+    void open_fp();
+    // perform format specific initialization
+    virtual void do_initialize() = 0;
+
+    // returns true, if new trace objects can still be added
+    // (i.e. trace file is not yet initialized)
+    bool add_trace_check( const std::string& name ) const;
+
+    // Flush results and close file.
+    virtual ~sc_trace_file_base();
+
+#if SC_TRACING_PHASE_CALLBACKS_
+private:
+    virtual void simulation_phase_callback();
+#endif // SC_TRACING_PHASE_CALLBACKS_
+
+protected:
+    FILE* fp;                          // pointer to the trace file
+    double      timescale_unit;        // in seconds
+    bool        timescale_set_by_user; // = true means set by user
+
+private:
+    std::string filename_;             // name of the file (for reporting)
+    bool        initialized_;          // tracing started?
+    bool        trace_delta_cycles_;   // also trace delta transitions?
+
+    static bool tracing_initialized_;  // shared setup of tracing implementation
+
+private: // disabled
+    sc_trace_file_base( const sc_trace_file_base& ) /* = delete */;
+    sc_trace_file_base& operator=( const sc_trace_file_base& ) /* = delete */;
+
+}; // class sc_trace_file_base
+
+// -----------------------------------------------------------------------
+
+// Convert double time to 64-bit integer
+
+void double_to_special_int64( double in, unsigned* high, unsigned* low );
+
+// obtain formatted time string
+std::string localtime_string();
+
+} // namespace sc_core
+
+/*****************************************************************************
+
+  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
+  changes you are making here.
+
+      Name, Affiliation, Date:
+  Description of Modification:
+
+ *****************************************************************************/
+
+#endif // SC_TRACE_FILE_BASE_H_INCLUDED_
+// Taf!