From 60a974076fd7fd49df930b18a212a117ea7d032c Mon Sep 17 00:00:00 2001
From: tkorvola <Timo.Korvola@vtt.fi>
Date: Tue, 7 Feb 2017 19:40:00 +0200
Subject: [PATCH] Plug more reference leaks.

I hope I am getting it right.  The Python C API is a bit messy
regarding reference behaviour.

Change-Id: I0e78b4f8e46eb387caf0d751f6bffac5f1b10c18
---
 .../jnipython.dll                             | Bin 67584 -> 68096 bytes
 .../src/sclpy.c                               |  58 ++++++++++++------
 2 files changed, 39 insertions(+), 19 deletions(-)

diff --git a/org.simantics.pythonlink.win32.x86_64/jnipython.dll b/org.simantics.pythonlink.win32.x86_64/jnipython.dll
index c2f62cb7f5de3bbfa0d808fa900bb308711c0fab..7cc11fd3f764998be28d7d5c889260ff1499bb2d 100644
GIT binary patch
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diff --git a/org.simantics.pythonlink.win32.x86_64/src/sclpy.c b/org.simantics.pythonlink.win32.x86_64/src/sclpy.c
index caed56d..762df28 100644
--- a/org.simantics.pythonlink.win32.x86_64/src/sclpy.c
+++ b/org.simantics.pythonlink.win32.x86_64/src/sclpy.c
@@ -32,6 +32,7 @@ jint throwIllegalArgumentException( JNIEnv *env, const char *message ) {
 	return throwException( env, ILLEGAL_ARGUMENT_EXCEPTION, message );
 }
 
+// Returns a borrowed reference.
 PyObject* getModule(jlong contextID) {
 	return PyState_FindModule((PyModuleDef*) contextID);
 //	return PyImport_AddModule("__main__");
@@ -105,19 +106,27 @@ static PyMethodDef sclWriterMethods[] = {
     {NULL, NULL, 0, NULL}
 };
 
-JNIEXPORT void JNICALL Java_org_simantics_pythonlink_PythonContext_initializePython(JNIEnv *env, jobject thisObj, jobject writer) {
+JNIEXPORT void JNICALL
+Java_org_simantics_pythonlink_PythonContext_initializePython(
+        JNIEnv *env, jobject thisObj, jobject writer) {
     Py_Initialize();
 
     {
-    	static struct PyModuleDef moduledef = { PyModuleDef_HEAD_INIT, "sclwriter", NULL, -1, sclWriterMethods, };
-		PyObject *m = PyModule_Create(&moduledef);
+    	static struct PyModuleDef moduledef = {
+    	    PyModuleDef_HEAD_INIT, "sclwriter", NULL, -1, sclWriterMethods
+    	};
+    	PyObject *m = PyModule_Create(&moduledef);
 
     	sclWriter = (*env)->NewGlobalRef(env, writer);
 
-    	if (m == NULL) throwException(env, PYTHON_EXCEPTION, "Failed to create SCL writer module");
-
-		PySys_SetObject("stdout", m);
-		PySys_SetObject("stderr", m);
+    	if (m == NULL) {
+    	    throwException(env, PYTHON_EXCEPTION,
+    	                   "Failed to create SCL writer module");
+    	} else {
+    	    PySys_SetObject("stdout", m);
+    	    PySys_SetObject("stderr", m);
+    	    Py_DECREF(m);
+    	}
     }
 
 	hasNumpy = _import_array();
@@ -145,12 +154,11 @@ JNIEXPORT jlong JNICALL Java_org_simantics_pythonlink_PythonContext_createContex
 		modDef->m_size = -1;
 
 		module = PyModule_Create(modDef);
-		Py_INCREF(module);
 		PyState_AddModule(module, modDef);
-
 		{
 			PyObject *builtin = PyImport_AddModule("builtins");
 			PyObject *dict = PyModule_GetDict(module);
+			Py_DECREF(module);
 			PyDict_SetItemString(dict, "__builtin__", builtin);
 			PyDict_SetItemString(dict, "__builtins__", builtin);
 
@@ -160,12 +168,11 @@ JNIEXPORT jlong JNICALL Java_org_simantics_pythonlink_PythonContext_createContex
 	}
 }
 
-JNIEXPORT void JNICALL Java_org_simantics_pythonlink_PythonContext_deleteContextImpl(JNIEnv *env, jobject thisObj, jlong contextID) {
+JNIEXPORT void JNICALL
+Java_org_simantics_pythonlink_PythonContext_deleteContextImpl(
+		JNIEnv *env, jobject thisObj, jlong contextID) {
 	PyModuleDef *modDef = (PyModuleDef*)contextID;
-	PyObject *module;
 	PyEval_RestoreThread(main_ts);
-	module = PyState_FindModule(modDef);
-	Py_XDECREF(module);
 	PyState_RemoveModule(modDef);
 	free((char*)modDef->m_name);
 	free(modDef);
@@ -204,6 +211,7 @@ PyObject *getPythonStringList(JNIEnv *env, jobjectArray value) {
 			PyList_SetItem(result, i, getPythonString(env, (jstring)item));
 		}
 		else {
+			Py_INCREF(Py_None);
 			PyList_SetItem(result, i, Py_None);
 		}
 	}
@@ -416,8 +424,12 @@ PyObject *getPythonRecordObject(JNIEnv *env, jobject object, jobject binding) {
 		jobject componentObject = (*env)->CallObjectMethod(env, binding, getComponent, object, i);
 		jobject componentBinding = (*env)->CallObjectMethod(env, binding, getComponentBinding, i);
 
-		PyObject *item = getPythonObject(env, componentObject, componentBinding);
-		PyDict_SetItem(result, getPythonString(env, fieldName), item);
+		PyObject
+			*key = getPythonString(env, fieldName),
+			*item = getPythonObject(env, componentObject, componentBinding);
+		PyDict_SetItem(result, key, item);
+		Py_DECREF(key);
+		Py_DECREF(item);
 	}
 
 	return result;
@@ -440,8 +452,10 @@ PyObject *getPythonArrayObject(JNIEnv *env, jobject object, jobject binding) {
 		jobject item = (*env)->CallObjectMethod(env, binding, getMethod, object, i);
 		if (item != NULL)
 			PyList_SetItem(result, i, getPythonObject(env, item, componentBinding));
-		else
+		else {
+			Py_INCREF(Py_None);
 			PyList_SetItem(result, i, Py_None);
+		}
 	}
 
 	return result;
@@ -470,7 +484,12 @@ PyObject *getPythonMapObject(JNIEnv *env, jobject object, jobject binding) {
 	for (i = 0; i < size; i++) {
 		jobject key = (*env)->GetObjectArrayElement(env, keys, i);
 		jobject item = (*env)->GetObjectArrayElement(env, values, i);
-		PyDict_SetItem(result, getPythonObject(env, key, keyBinding), getPythonObject(env, item, valueBinding));
+		PyObject
+			*pkey = getPythonObject(env, key, keyBinding),
+			*pitem = getPythonObject(env, item, valueBinding);
+		PyDict_SetItem(result, pkey, pitem);
+		Py_DECREF(pkey);
+		Py_DECREF(pitem);
 	}
 
 	(*env)->DeleteLocalRef(env, keys);
@@ -601,6 +620,7 @@ PyObject *getPythonObject(JNIEnv *env, jobject value, jobject binding) {
 	}
 }
 
+// Steals refs to name & value.
 void setPythonVariable(PyObject *module, PyObject *name, PyObject *value) {
 	if (name && value) {
 		PyDict_SetItem(PyModule_GetDict(module), name, value);
@@ -1013,8 +1033,8 @@ Java_org_simantics_pythonlink_PythonContext_executePythonStatementImpl(
 
 		{
 			PyObject *result = PyRun_String(utfchars, Py_file_input, globals, globals);
-
 			PyObject *exceptionType = PyErr_Occurred();
+
 			if (exceptionType != NULL) {
 				PyObject *exception, *traceback, *message;
 				PyErr_Fetch(&exceptionType, &exception, &traceback);
@@ -1055,7 +1075,7 @@ Java_org_simantics_pythonlink_PythonContext_executePythonStatementImpl(
 // Returns a borrowed reference.
 static PyObject *getPythonValue(
 		JNIEnv *env, jlong contextID, jstring variableName) {
-	PyObject *module = getModule(contextID);
+    PyObject *module = getModule(contextID);
     PyObject *pythonName = getPythonString(env, variableName);
     PyObject *value = PyDict_GetItem(PyModule_GetDict(module), pythonName);
 
-- 
2.45.1