Add ob_exports handling for bytearray

Author: msimacek

graalpython/com.oracle.graal.python.cext/src/bytearrayobject.c

@@ -54,5 +54,10 @@ int bytearray_getbuffer(PyByteArrayObject *obj, Py_buffer *view, int flags) {
     ptr = (void *) PyByteArray_AS_STRING(obj);
     /* cannot fail if view != NULL and readonly == 0 */
     (void)PyBuffer_FillInfo(view, (PyObject*)obj, ptr, Py_SIZE(obj), 0, flags);
+    obj->ob_exports++;
     return 0;
 }
+
+void bytearray_releasebuffer(PyByteArrayObject *obj, Py_buffer *view) {
+    obj->ob_exports--;
+}

graalpython/com.oracle.graal.python.cext/src/capi.c

@@ -247,7 +247,7 @@ static void initialize_globals() {
 
 static void initialize_bufferprocs() {
     polyglot_invoke(PY_TRUFFLE_CEXT, "PyTruffle_SetBufferProcs", native_to_java((PyObject*)&PyBytes_Type), (getbufferproc)bytes_buffer_getbuffer, (releasebufferproc)NULL);
-    polyglot_invoke(PY_TRUFFLE_CEXT, "PyTruffle_SetBufferProcs", native_to_java((PyObject*)&PyByteArray_Type), (getbufferproc)bytearray_getbuffer, (releasebufferproc)NULL);
+    polyglot_invoke(PY_TRUFFLE_CEXT, "PyTruffle_SetBufferProcs", native_to_java((PyObject*)&PyByteArray_Type), (getbufferproc)bytearray_getbuffer, (releasebufferproc)bytearray_releasebuffer);
     polyglot_invoke(PY_TRUFFLE_CEXT, "PyTruffle_SetBufferProcs", native_to_java((PyObject*)&PyBuffer_Type), (getbufferproc)bufferdecorator_getbuffer, (releasebufferproc)NULL);
     polyglot_invoke(PY_TRUFFLE_CEXT, "PyTruffle_SetBufferProcs", native_to_java((PyObject*)&PyMemoryView_Type), (getbufferproc)memoryview_getbuffer, (releasebufferproc)memoryview_releasebuffer);
 }

graalpython/com.oracle.graal.python.cext/src/capi.h

@@ -385,6 +385,7 @@ extern PyObject* wrapped_null;
 /* BYTES, BYTEARRAY */
 int bytes_buffer_getbuffer(PyBytesObject *self, Py_buffer *view, int flags);
 int bytearray_getbuffer(PyByteArrayObject *obj, Py_buffer *view, int flags);
+void bytearray_releasebuffer(PyByteArrayObject *obj, Py_buffer *view);
 
 /* Like 'memcpy' but can read/write from/to managed objects. */
 int bytes_copy2mem(char* target, char* source, size_t nbytes);