systemc: Add a minimal version of the deprecated sc_process_b.

This type is deprecated, but some tests still rely on it. This change
adds just enough of it to satisfy the tests, and also the several
different mechanisms for retrieving the sc_process_b which refers to
the currently active process.

Change-Id: Id122ae5df23744b5de1e1c97573412f97a73b77a
Reviewed-on: https://gem5-review.googlesource.com/11351
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

src/systemc/core/sc_process_handle.cc

@@ -63,6 +63,29 @@ sc_unwind_exception::~sc_unwind_exception() throw()
 }
 
 
+const char *
+sc_process_b::name()
+{
+    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
+    return "";
+}
+
+const char *
+sc_process_b::kind()
+{
+    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
+    return "";
+}
+
+
+sc_process_b *
+sc_get_curr_process_handle()
+{
+    warn("%s not implemented.\n", __PRETTY_FUNCTION__);
+    return nullptr;
+}
+
+
 sc_process_handle::sc_process_handle()
 {
     warn("%s not implemented.\n", __PRETTY_FUNCTION__);

src/systemc/ext/core/_using.hh

@@ -124,6 +124,11 @@ using sc_core::sc_descendent_inclusion_info;
 using sc_core::SC_NO_DESCENDANTS;
 using sc_core::SC_INCLUDE_DESCENDANTS;
 using sc_core::sc_unwind_exception;
+using sc_core::sc_process_b;
+using sc_core::sc_get_curr_process_handle;
+using sc_core::sc_get_current_process_b;
+using sc_core::sc_curr_proc_info;
+using sc_core::sc_curr_proc_handle;
 using sc_core::sc_process_handle;
 using sc_core::sc_get_current_process_handle;
 using sc_core::sc_is_unwinding;

src/systemc/ext/core/sc_process_handle.hh

@@ -77,6 +77,34 @@ class sc_unwind_exception : public std::exception
     sc_unwind_exception();
 };
 
+// Deprecated
+// An incomplete version of sc_process_b to satisfy the tests.
+class sc_process_b
+{
+  public:
+    const char *file;
+    int lineno;
+    const char *name();
+    const char *kind();
+};
+
+// Deprecated
+sc_process_b *sc_get_curr_process_handle();
+static inline sc_process_b *
+sc_get_current_process_b()
+{
+    return sc_get_curr_process_handle();
+}
+
+// Deprecated/nonstandard
+struct sc_curr_proc_info
+{
+    sc_process_b *process_handle;
+    sc_curr_proc_kind kind;
+    sc_curr_proc_info() : process_handle(NULL), kind(SC_NO_PROC_) {}
+};
+typedef const sc_curr_proc_info *sc_curr_proc_handle;
+
 class sc_process_handle
 {
   private:

src/systemc/tests/working.filt

@@ -8,10 +8,6 @@ name == "sc_elab_and_sim",
 path.startswith("systemc/tracing/wif_trace"),
 path.startswith("systemc/misc/stars/wif_trace"),
 
-# These tests refers to sc_get_current_process_b which is a deprecated type and
-# something we're not currently planning to support.
-path.startswith("systemc/kernel/sc_process_b"),
-
 # Phase callbacks are an experimental feature. Also calling all the interested
 # sc_objects whenever time advances would add a non-trivial amount of
 # complexity and is probably not worth implementing in general.
@@ -22,6 +18,7 @@ path in (
     # Uses sc_get_curr_simcontext.
     "systemc/kernel/sc_object_manager/test01",
     "systemc/kernel/sc_name_gen/test1",
+    "systemc/kernel/sc_process_b/test2",
 
     # Uses sc_elab_and_sim.
     "systemc/kernel/sc_main_main",