From 5864db3c2bf353d4ee124d35aa2f911c4249edbc Mon Sep 17 00:00:00 2001
From: Benedikt Tutzer <e1225461@student.tuwien.ac.at>
Date: Mon, 20 Aug 2018 14:44:03 +0200
Subject: [PATCH] Fixed issue when using a python plugin in the yosys shell

---
 kernel/python_wrappers.cc | 11 +++++++----
 kernel/yosys.cc           | 16 ++++++++++++++++
 kernel/yosys.h            |  5 +++++
 3 files changed, 28 insertions(+), 4 deletions(-)

diff --git a/kernel/python_wrappers.cc b/kernel/python_wrappers.cc
index 197be0853..af1f80929 100644
--- a/kernel/python_wrappers.cc
+++ b/kernel/python_wrappers.cc
@@ -2783,10 +2783,13 @@ namespace YOSYS_PYTHON {
 	struct Initializer
 	{
 		Initializer() {
-			Yosys::log_streams.push_back(&std::cout);
-			Yosys::log_error_stderr = true;
-			Yosys::yosys_setup();
-			Yosys::yosys_banner();
+			if(!Yosys::yosys_already_setup())
+			{
+				Yosys::log_streams.push_back(&std::cout);
+				Yosys::log_error_stderr = true;
+				Yosys::yosys_setup();
+				Yosys::yosys_banner();
+			}
 		}
 
 		Initializer(Initializer const &) {}
diff --git a/kernel/yosys.cc b/kernel/yosys.cc
index 8e16ba01d..8380fe75d 100644
--- a/kernel/yosys.cc
+++ b/kernel/yosys.cc
@@ -55,6 +55,16 @@
 #  include <sys/sysctl.h>
 #endif
 
+#ifdef WITH_PYTHON
+#if PY_MAJOR_VERSION >= 3
+#   define INIT_MODULE PyInit_libyosys
+    extern "C" PyObject* INIT_MODULE();
+#else
+#   define INIT_MODULE initlibyosys
+	    extern "C" void INIT_MODULE();
+#endif
+#endif
+
 #include <limits.h>
 #include <errno.h>
 
@@ -482,6 +492,7 @@ void yosys_setup()
 	IdString::get_reference(empty_id.index_);
 
 	#ifdef WITH_PYTHON
+		PyImport_AppendInittab((char*)"libyosys", INIT_MODULE);
 		Py_Initialize();
 		PyRun_SimpleString("import sys");
 		PyRun_SimpleString("sys.path.append(\"./\")");
@@ -496,6 +507,11 @@ void yosys_setup()
 	log_push();
 }
 
+bool yosys_already_setup()
+{
+	return already_setup;
+}
+
 bool already_shutdown = false;
 
 void yosys_shutdown()
diff --git a/kernel/yosys.h b/kernel/yosys.h
index 4380a5b69..6ed0f8b20 100644
--- a/kernel/yosys.h
+++ b/kernel/yosys.h
@@ -278,6 +278,11 @@ namespace hashlib {
 }
 
 void yosys_setup();
+
+#ifdef WITH_PYTHON
+bool yosys_already_setup();
+#endif
+
 void yosys_shutdown();
 
 #ifdef YOSYS_ENABLE_TCL