From 09d6350f3b7b91e305c30c98d5b17c0853f904e4 Mon Sep 17 00:00:00 2001
From: Karl Nelson <nelson85@llnl.gov>
Date: Sun, 25 Aug 2024 23:03:37 -0700
Subject: [PATCH 01/13] Work on Python 3.13

---
 native/python/pyjp_class.cpp |  5 ++++
 native/python/pyjp_value.cpp | 55 +++++++++---------------------------
 2 files changed, 19 insertions(+), 41 deletions(-)

diff --git a/native/python/pyjp_class.cpp b/native/python/pyjp_class.cpp
index fc633e11..4b0b5820 100644
--- a/native/python/pyjp_class.cpp
+++ b/native/python/pyjp_class.cpp
@@ -125,6 +125,11 @@ PyObject *PyJPClass_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
 		typenew->tp_new = PyJPException_Type->tp_new;
 	}
 	((PyJPClass*) typenew)->m_Doc = nullptr;
+
+	// This flag will try to place the dictionary are part of the object which 
+	// adds an unknown number of bytes to the end of the object making it impossible
+	// to attach our needed data.  If we kill the flag then we get usable behavior.
+	typenew->tp_flags &= ~Py_TPFLAGS_INLINE_VALUES;
 	return (PyObject*) typenew;
 	JP_PY_CATCH(nullptr);
 }
diff --git a/native/python/pyjp_value.cpp b/native/python/pyjp_value.cpp
index 1deecaa9..370049db 100644
--- a/native/python/pyjp_value.cpp
+++ b/native/python/pyjp_value.cpp
@@ -16,6 +16,7 @@
 #include "jpype.h"
 #include "pyjp.h"
 #include "jp_stringtype.h"
+#include <Python.h>
 
 #ifdef __cplusplus
 extern "C"
@@ -40,42 +41,15 @@ extern "C"
 PyObject* PyJPValue_alloc(PyTypeObject* type, Py_ssize_t nitems)
 {
 	JP_PY_TRY("PyJPValue_alloc");
-	// Modification from Python to add size elements
-	const size_t size = _PyObject_VAR_SIZE(type, nitems + 1) + sizeof (JPValue);
-	PyObject *obj = nullptr;
-	if (PyType_IS_GC(type))
-	{
-		// Horrible kludge because python lacks an API for allocating a GC type with extra memory
-		// The private method _PyObject_GC_Alloc is no longer visible, so we are forced to allocate
-		// a different type with the extra memory and then hot swap the type to the real one.
-		PyTypeObject type2;
-		type2.tp_basicsize = size;
-		type2.tp_itemsize = 0;
-		type2.tp_name = nullptr;
-		type2.tp_flags = type->tp_flags;
-		type2.tp_traverse = type->tp_traverse;
-
-		// Allocate the fake type
-		obj = PyObject_GC_New(PyObject, &type2);
-
-		// Note the object will be inited twice which should not leak. (fingers crossed)
-	}
-	else
-	{
-		obj = (PyObject*) PyObject_MALLOC(size);
-	}
-	if (obj == nullptr)
-		return PyErr_NoMemory(); // GCOVR_EXCL_LINE
-	memset(obj, 0, size);
-
-
 	Py_ssize_t refcnt = ((PyObject*) type)->ob_refcnt;
-	obj->ob_type = type;
 
-	if (type->tp_itemsize == 0)
-		PyObject_Init(obj, type);
-	else
-		PyObject_InitVar((PyVarObject *) obj, type, nitems);
+	// 1) allocate memory (+pre +inline)
+	// 2) gc link
+	// 3) init (set type, ref type, set ob_size)
+	// 4) set up inline dict past the length of object (if inline)
+	type->tp_basicsize += sizeof(JPValue);
+	PyObject* obj = PyType_GenericAlloc(type, nitems);
+	type->tp_basicsize -= sizeof(JPValue);
 
 	// This line is required to deal with Python bug (GH-11661)
 	// Some versions of Python fail to increment the reference counter of
@@ -83,10 +57,6 @@ PyObject* PyJPValue_alloc(PyTypeObject* type, Py_ssize_t nitems)
 	if (refcnt == ((PyObject*) type)->ob_refcnt)
 		Py_INCREF(type);  // GCOVR_EXCL_LINE
 
-	if (PyType_IS_GC(type))
-	{
-		PyObject_GC_Track(obj);
-	}
 	JP_TRACE("alloc", type->tp_name, obj);
 	return obj;
 	JP_PY_CATCH(nullptr);
@@ -107,17 +77,20 @@ Py_ssize_t PyJPValue_getJavaSlotOffset(PyObject* self)
 	if (type == nullptr
 			|| type->tp_alloc != (allocfunc) PyJPValue_alloc
 			|| type->tp_finalize != (destructor) PyJPValue_finalize)
+    {
 		return 0;
-	Py_ssize_t offset;
-	Py_ssize_t sz = 0;
+    }
 
+	Py_ssize_t offset = 0;
+	Py_ssize_t sz = 0;
+    
 #if PY_VERSION_HEX>=0x030c0000
 	// starting in 3.12 there is no longer ob_size in PyLong
 	if (PyType_HasFeature(self->ob_type, Py_TPFLAGS_LONG_SUBCLASS))
 		sz = (((PyLongObject*)self)->long_value.lv_tag) >> 3;  // Private NON_SIZE_BITS
 	else 
 #endif
-		if (type->tp_itemsize != 0)
+	if (type->tp_itemsize != 0)
 		sz = Py_SIZE(self);
 	// PyLong abuses ob_size with negative values prior to 3.12
 	if (sz < 0)

From f0ed92c302e96955770efc6a871c30d1c43c3d14 Mon Sep 17 00:00:00 2001
From: Karl Nelson <nelson85@llnl.gov>
Date: Sun, 25 Aug 2024 23:28:27 -0700
Subject: [PATCH 02/13] Porting backward

---
 native/python/pyjp_class.cpp |  2 ++
 native/python/pyjp_value.cpp | 31 +++++++++++++++++++++++++------
 2 files changed, 27 insertions(+), 6 deletions(-)

diff --git a/native/python/pyjp_class.cpp b/native/python/pyjp_class.cpp
index 4b0b5820..4cdb8f1a 100644
--- a/native/python/pyjp_class.cpp
+++ b/native/python/pyjp_class.cpp
@@ -126,10 +126,12 @@ PyObject *PyJPClass_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
 	}
 	((PyJPClass*) typenew)->m_Doc = nullptr;
 
+#if PY_VERSION_HEX >= 0x030d0000
 	// This flag will try to place the dictionary are part of the object which 
 	// adds an unknown number of bytes to the end of the object making it impossible
 	// to attach our needed data.  If we kill the flag then we get usable behavior.
 	typenew->tp_flags &= ~Py_TPFLAGS_INLINE_VALUES;
+#endif
 	return (PyObject*) typenew;
 	JP_PY_CATCH(nullptr);
 }
diff --git a/native/python/pyjp_value.cpp b/native/python/pyjp_value.cpp
index 370049db..0a28ee36 100644
--- a/native/python/pyjp_value.cpp
+++ b/native/python/pyjp_value.cpp
@@ -41,8 +41,32 @@ extern "C"
 PyObject* PyJPValue_alloc(PyTypeObject* type, Py_ssize_t nitems)
 {
 	JP_PY_TRY("PyJPValue_alloc");
+
+#if PY_VERSION_HEX<0x030c0000
 	Py_ssize_t refcnt = ((PyObject*) type)->ob_refcnt;
+	// Modification from Python to add size elements
+	const size_t size = _PyObject_VAR_SIZE(type, nitems + 1) + sizeof (JPValue);
+	PyObject *obj = (PyType_IS_GC(type)) ? _PyObject_GC_Malloc(size)
+    	: (PyObject *) PyObject_MALLOC(size);
+	if (obj == NULL)
+		return PyErr_NoMemory(); // GCOVR_EXCL_LINE
+	memset(obj, 0, size);
+
+	if (type->tp_itemsize == 0)
+		PyObject_Init(obj, type);
+	else
+		PyObject_InitVar((PyVarObject *) obj, type, nitems);
+
+	// This line is required to deal with Python bug (GH-11661)
+	// Some versions of Python fail to increment the reference counter of
+	// heap types properly.
+	if (refcnt == ((PyObject*) type)->ob_refcnt)
+		Py_INCREF(type);  // GCOVR_EXCL_LINE
+
+	if (PyType_IS_GC(type))
+		PyObject_GC_Track(obj);
 
+#else
 	// 1) allocate memory (+pre +inline)
 	// 2) gc link
 	// 3) init (set type, ref type, set ob_size)
@@ -50,12 +74,7 @@ PyObject* PyJPValue_alloc(PyTypeObject* type, Py_ssize_t nitems)
 	type->tp_basicsize += sizeof(JPValue);
 	PyObject* obj = PyType_GenericAlloc(type, nitems);
 	type->tp_basicsize -= sizeof(JPValue);
-
-	// This line is required to deal with Python bug (GH-11661)
-	// Some versions of Python fail to increment the reference counter of
-	// heap types properly.
-	if (refcnt == ((PyObject*) type)->ob_refcnt)
-		Py_INCREF(type);  // GCOVR_EXCL_LINE
+#endif
 
 	JP_TRACE("alloc", type->tp_name, obj);
 	return obj;

From 897e60c3d718890630ebfa84034f59773d22df86 Mon Sep 17 00:00:00 2001
From: Karl Nelson <nelson85@llnl.gov>
Date: Sun, 25 Aug 2024 23:59:41 -0700
Subject: [PATCH 03/13] Fix for 3.11

---
 native/python/pyjp_value.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/native/python/pyjp_value.cpp b/native/python/pyjp_value.cpp
index 0a28ee36..f796c535 100644
--- a/native/python/pyjp_value.cpp
+++ b/native/python/pyjp_value.cpp
@@ -42,7 +42,7 @@ PyObject* PyJPValue_alloc(PyTypeObject* type, Py_ssize_t nitems)
 {
 	JP_PY_TRY("PyJPValue_alloc");
 
-#if PY_VERSION_HEX<0x030c0000
+#if PY_VERSION_HEX<0x030b0000
 	Py_ssize_t refcnt = ((PyObject*) type)->ob_refcnt;
 	// Modification from Python to add size elements
 	const size_t size = _PyObject_VAR_SIZE(type, nitems + 1) + sizeof (JPValue);

From 141b09dd8ef25f82f72db0183b7518ff02098bcb Mon Sep 17 00:00:00 2001
From: "Martin K. Scherer" <m.scherer@fu-berlin.de>
Date: Wed, 28 Aug 2024 10:43:24 +0200
Subject: [PATCH 04/13] [ci] added Python 3.13 to matrix

---
 .azure/build.yml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/.azure/build.yml b/.azure/build.yml
index 1ebe2455..629444ca 100644
--- a/.azure/build.yml
+++ b/.azure/build.yml
@@ -71,6 +71,10 @@ jobs:
         imageName: "ubuntu-latest"
         python.version: '3.12'
         jdk.version: '17'
+      linux-py3.13-jdk17:
+        imageName: "ubuntu-latest"
+        python.version: '3.13'
+        jdk.version: '17'
       # Windows
       windows-py3.8-jdk8:
         imageName: "windows-2019"

From ff1454c7fd82b9576836582ffbe7abc33937c19a Mon Sep 17 00:00:00 2001
From: "Martin K. Scherer" <marscher@users.noreply.github.com>
Date: Wed, 28 Aug 2024 10:51:38 +0200
Subject: [PATCH 05/13] try to use 3.13-rc1

---
 .azure/build.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.azure/build.yml b/.azure/build.yml
index 629444ca..a8bf0c1b 100644
--- a/.azure/build.yml
+++ b/.azure/build.yml
@@ -73,7 +73,7 @@ jobs:
         jdk.version: '17'
       linux-py3.13-jdk17:
         imageName: "ubuntu-latest"
-        python.version: '3.13'
+        python.version: '3.13.0-rc.1'
         jdk.version: '17'
       # Windows
       windows-py3.8-jdk8:

From 6cc959fb1937e05de71f4f658bf00737845aeab0 Mon Sep 17 00:00:00 2001
From: Karl Nelson <nelson85@llnl.gov>
Date: Sat, 14 Sep 2024 12:15:15 -0700
Subject: [PATCH 06/13] Unstable API call to create memory for out object

---
 native/python/pyjp_value.cpp | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/native/python/pyjp_value.cpp b/native/python/pyjp_value.cpp
index f796c535..b5281dac 100644
--- a/native/python/pyjp_value.cpp
+++ b/native/python/pyjp_value.cpp
@@ -67,13 +67,9 @@ PyObject* PyJPValue_alloc(PyTypeObject* type, Py_ssize_t nitems)
 		PyObject_GC_Track(obj);
 
 #else
-	// 1) allocate memory (+pre +inline)
-	// 2) gc link
-	// 3) init (set type, ref type, set ob_size)
-	// 4) set up inline dict past the length of object (if inline)
-	type->tp_basicsize += sizeof(JPValue);
-	PyObject* obj = PyType_GenericAlloc(type, nitems);
-	type->tp_basicsize -= sizeof(JPValue);
+	PyObject* obj = PyUnstable_Object_GC_NewWithExtraData(type, size - _PyObject_SIZE(tp));
+	if (type->tp_itemsize > 0) {
+        Py_SET_SIZE((PyVarObject*) obj, nitems);
 #endif
 
 	JP_TRACE("alloc", type->tp_name, obj);

From c115b76c73b2551668a071e6ecd05d5b577b9e8a Mon Sep 17 00:00:00 2001
From: Karl Nelson <nelson85@llnl.gov>
Date: Sat, 14 Sep 2024 13:26:02 -0700
Subject: [PATCH 07/13] Second attempt at hack

---
 native/python/pyjp_value.cpp | 32 +++++++++++++++++++++++---------
 1 file changed, 23 insertions(+), 9 deletions(-)

diff --git a/native/python/pyjp_value.cpp b/native/python/pyjp_value.cpp
index b5281dac..8b7b9de5 100644
--- a/native/python/pyjp_value.cpp
+++ b/native/python/pyjp_value.cpp
@@ -44,10 +44,10 @@ PyObject* PyJPValue_alloc(PyTypeObject* type, Py_ssize_t nitems)
 
 #if PY_VERSION_HEX<0x030b0000
 	Py_ssize_t refcnt = ((PyObject*) type)->ob_refcnt;
-	// Modification from Python to add size elements
 	const size_t size = _PyObject_VAR_SIZE(type, nitems + 1) + sizeof (JPValue);
+	// Modification from Python to add size elements
 	PyObject *obj = (PyType_IS_GC(type)) ? _PyObject_GC_Malloc(size)
-    	: (PyObject *) PyObject_MALLOC(size);
+		: (PyObject *) PyObject_MALLOC(size);
 	if (obj == NULL)
 		return PyErr_NoMemory(); // GCOVR_EXCL_LINE
 	memset(obj, 0, size);
@@ -67,9 +67,23 @@ PyObject* PyJPValue_alloc(PyTypeObject* type, Py_ssize_t nitems)
 		PyObject_GC_Track(obj);
 
 #else
-	PyObject* obj = PyUnstable_Object_GC_NewWithExtraData(type, size - _PyObject_SIZE(tp));
-	if (type->tp_itemsize > 0) {
-        Py_SET_SIZE((PyVarObject*) obj, nitems);
+
+	// 1) allocate memory (+pre +inline)
+	// 2) gc link
+	// 3) init (set type, ref type, set ob_size)
+	// 4) set up inline dict past the length of object (if inline)
+	PyObject* obj = nullptr;
+	if (type->tp_itemsize != 0) {
+		Py_ssize_t extra = (sizeof(JPValue))/type->tp_itemsize;
+		if (extra == 0)
+			extra = 1;
+		obj = PyType_GenericAlloc(type, nitems+extra);
+		Py_SET_SIZE(obj, nitems);
+	}
+	else {
+		// why do we need twice the allocation.   Not sure, nothing in our logic says that it should be necessary
+		obj = PyUnstable_Object_GC_NewWithExtraData(type, 2*sizeof(JPValue));
+	}
 #endif
 
 	JP_TRACE("alloc", type->tp_name, obj);
@@ -92,13 +106,13 @@ Py_ssize_t PyJPValue_getJavaSlotOffset(PyObject* self)
 	if (type == nullptr
 			|| type->tp_alloc != (allocfunc) PyJPValue_alloc
 			|| type->tp_finalize != (destructor) PyJPValue_finalize)
-    {
+	{
 		return 0;
-    }
+	}
 
 	Py_ssize_t offset = 0;
 	Py_ssize_t sz = 0;
-    
+	
 #if PY_VERSION_HEX>=0x030c0000
 	// starting in 3.12 there is no longer ob_size in PyLong
 	if (PyType_HasFeature(self->ob_type, Py_TPFLAGS_LONG_SUBCLASS))
@@ -209,7 +223,7 @@ PyObject* PyJPValue_str(PyObject* self)
 				Py_INCREF(cache);
 				return cache;
 			}
-            auto jstr = (jstring) value->getValue().l;
+			auto jstr = (jstring) value->getValue().l;
 			string str;
 			str = frame.toStringUTF8(jstr);
 			cache = JPPyString::fromStringUTF8(str).keep();

From bf4f5592f258c838c4b4090a6130ab1a68285e3c Mon Sep 17 00:00:00 2001
From: Karl Nelson <nelson85@llnl.gov>
Date: Sat, 14 Sep 2024 15:35:40 -0700
Subject: [PATCH 08/13] I give up

---
 native/python/pyjp_value.cpp  |  19 +-
 native/python/pyjp_value2.cpp | 331 ++++++++++++++++++++++++++++++++++
 2 files changed, 345 insertions(+), 5 deletions(-)
 create mode 100644 native/python/pyjp_value2.cpp

diff --git a/native/python/pyjp_value.cpp b/native/python/pyjp_value.cpp
index 8b7b9de5..629f8983 100644
--- a/native/python/pyjp_value.cpp
+++ b/native/python/pyjp_value.cpp
@@ -66,14 +66,23 @@ PyObject* PyJPValue_alloc(PyTypeObject* type, Py_ssize_t nitems)
 	if (PyType_IS_GC(type))
 		PyObject_GC_Track(obj);
 
+#elif PY_VERSION_HEX<0x030c0000
+	// At some point Python 3.11 backported changes corresponding to Python 3.12
+	// without the support for allocation of method, and with bugs.  We have
+	// to mutilate the base size of the object to get the extra memory we need
+	// And the size we must request appears to be larger tha needed.  This
+	// coresponds to the same bug in PyUnstable_Object_GC_NewWithExtraData.
+	//
+	// This is a horrible hack and I can't guarantee anything about the stability 
+	// of it!
+	type->tp_basicsize += 2*sizeof(JPValue);
+	PyObject* obj = PyType_GenericAlloc(type, nitems);
+	type->tp_basicsize -= 2*sizeof(JPValue);
 #else
-
-	// 1) allocate memory (+pre +inline)
-	// 2) gc link
-	// 3) init (set type, ref type, set ob_size)
-	// 4) set up inline dict past the length of object (if inline)
 	PyObject* obj = nullptr;
 	if (type->tp_itemsize != 0) {
+		// There is no corresponding PyUnstable_VarObject_GC_NewWithExtraData method 
+		// Without one we are just going to aske for our needed memory though backdoor methods.
 		Py_ssize_t extra = (sizeof(JPValue))/type->tp_itemsize;
 		if (extra == 0)
 			extra = 1;
diff --git a/native/python/pyjp_value2.cpp b/native/python/pyjp_value2.cpp
new file mode 100644
index 00000000..0a28ee36
--- /dev/null
+++ b/native/python/pyjp_value2.cpp
@@ -0,0 +1,331 @@
+/*****************************************************************************
+   Licensed 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.
+
+   See NOTICE file for details.
+ *****************************************************************************/
+#include "jpype.h"
+#include "pyjp.h"
+#include "jp_stringtype.h"
+#include <Python.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/**
+ * Allocate a new Python object with a slot for Java.
+ *
+ * We need extra space to store our values, but because there
+ * is no way to do so without disturbing the object layout.
+ * Fortunately, Python already handles this for dict and weakref.
+ * Python aligns the ends of the structure and increases the
+ * base type size to add additional slots to a standard object.
+ *
+ * We will use the same trick to add an additional slot for Java
+ * after the end of the object outside of where Python is looking.
+ * As the memory is aligned this is safe to do.  We will use
+ * the alloc and finalize slot to recognize which objects have this
+ * extra slot appended.
+ */
+PyObject* PyJPValue_alloc(PyTypeObject* type, Py_ssize_t nitems)
+{
+	JP_PY_TRY("PyJPValue_alloc");
+
+#if PY_VERSION_HEX<0x030c0000
+	Py_ssize_t refcnt = ((PyObject*) type)->ob_refcnt;
+	// Modification from Python to add size elements
+	const size_t size = _PyObject_VAR_SIZE(type, nitems + 1) + sizeof (JPValue);
+	PyObject *obj = (PyType_IS_GC(type)) ? _PyObject_GC_Malloc(size)
+    	: (PyObject *) PyObject_MALLOC(size);
+	if (obj == NULL)
+		return PyErr_NoMemory(); // GCOVR_EXCL_LINE
+	memset(obj, 0, size);
+
+	if (type->tp_itemsize == 0)
+		PyObject_Init(obj, type);
+	else
+		PyObject_InitVar((PyVarObject *) obj, type, nitems);
+
+	// This line is required to deal with Python bug (GH-11661)
+	// Some versions of Python fail to increment the reference counter of
+	// heap types properly.
+	if (refcnt == ((PyObject*) type)->ob_refcnt)
+		Py_INCREF(type);  // GCOVR_EXCL_LINE
+
+	if (PyType_IS_GC(type))
+		PyObject_GC_Track(obj);
+
+#else
+	// 1) allocate memory (+pre +inline)
+	// 2) gc link
+	// 3) init (set type, ref type, set ob_size)
+	// 4) set up inline dict past the length of object (if inline)
+	type->tp_basicsize += sizeof(JPValue);
+	PyObject* obj = PyType_GenericAlloc(type, nitems);
+	type->tp_basicsize -= sizeof(JPValue);
+#endif
+
+	JP_TRACE("alloc", type->tp_name, obj);
+	return obj;
+	JP_PY_CATCH(nullptr);
+}
+
+bool PyJPValue_hasJavaSlot(PyTypeObject* type)
+{
+	if (type == nullptr
+			|| type->tp_alloc != (allocfunc) PyJPValue_alloc
+			|| type->tp_finalize != (destructor) PyJPValue_finalize)
+		return false;  // GCOVR_EXCL_LINE
+	return true;
+}
+
+Py_ssize_t PyJPValue_getJavaSlotOffset(PyObject* self)
+{
+	PyTypeObject *type = Py_TYPE(self);
+	if (type == nullptr
+			|| type->tp_alloc != (allocfunc) PyJPValue_alloc
+			|| type->tp_finalize != (destructor) PyJPValue_finalize)
+    {
+		return 0;
+    }
+
+	Py_ssize_t offset = 0;
+	Py_ssize_t sz = 0;
+    
+#if PY_VERSION_HEX>=0x030c0000
+	// starting in 3.12 there is no longer ob_size in PyLong
+	if (PyType_HasFeature(self->ob_type, Py_TPFLAGS_LONG_SUBCLASS))
+		sz = (((PyLongObject*)self)->long_value.lv_tag) >> 3;  // Private NON_SIZE_BITS
+	else 
+#endif
+	if (type->tp_itemsize != 0)
+		sz = Py_SIZE(self);
+	// PyLong abuses ob_size with negative values prior to 3.12
+	if (sz < 0)
+		sz = -sz;
+	if (type->tp_itemsize == 0)
+		offset = _PyObject_VAR_SIZE(type, 1);
+	else
+		offset = _PyObject_VAR_SIZE(type, sz + 1);
+	return offset;
+}
+
+/**
+ * Get the Java value if attached.
+ *
+ * The Java class is guaranteed not to be nullptr on success.
+ *
+ * @param obj
+ * @return the Java value or 0 if not found.
+ */
+JPValue* PyJPValue_getJavaSlot(PyObject* self)
+{
+	Py_ssize_t offset = PyJPValue_getJavaSlotOffset(self);
+	if (offset == 0)
+		return nullptr;
+	auto value = (JPValue*) (((char*) self) + offset);
+	if (value->getClass() == nullptr)
+		return nullptr;
+	return value;
+}
+
+void PyJPValue_free(void* obj)
+{
+	JP_PY_TRY("PyJPValue_free", obj);
+	// Normally finalize is not run on simple classes.
+	PyTypeObject *type = Py_TYPE(obj);
+	if (type->tp_finalize != nullptr)
+		type->tp_finalize((PyObject*) obj);
+	if (type->tp_flags & Py_TPFLAGS_HAVE_GC)
+		PyObject_GC_Del(obj);
+	else
+		PyObject_Free(obj);  // GCOVR_EXCL_LINE
+	JP_PY_CATCH_NONE();
+}
+
+void PyJPValue_finalize(void* obj)
+{
+	JP_PY_TRY("PyJPValue_finalize", obj);
+	JP_TRACE("type", Py_TYPE(obj)->tp_name);
+	JPValue* value = PyJPValue_getJavaSlot((PyObject*) obj);
+	if (value == nullptr)
+		return;
+	JPContext *context = JPContext_global;
+	if (context == nullptr || !context->isRunning())
+		return;
+	JPJavaFrame frame = JPJavaFrame::outer(context);
+	JPClass* cls = value->getClass();
+	// This one can't check for initialized because we may need to delete a stale
+	// resource after shutdown.
+	if (cls != nullptr && context->isRunning() && !cls->isPrimitive())
+	{
+		JP_TRACE("Value", cls->getCanonicalName(), &(value->getValue()));
+		JP_TRACE("Dereference object");
+		context->ReleaseGlobalRef(value->getValue().l);
+		*value = JPValue();
+	}
+	JP_PY_CATCH_NONE();
+}
+
+/** This is the way to convert an object into a python string. */
+PyObject* PyJPValue_str(PyObject* self)
+{
+	JP_PY_TRY("PyJPValue_str", self);
+	JPContext *context = PyJPModule_getContext();
+	JPJavaFrame frame = JPJavaFrame::outer(context);
+	JPValue* value = PyJPValue_getJavaSlot(self);
+	if (value == nullptr)
+	{
+		PyErr_SetString(PyExc_TypeError, "Not a Java value");
+		return nullptr;
+	}
+
+	JPClass* cls = value->getClass();
+	if (cls->isPrimitive())
+	{
+		PyErr_SetString(PyExc_TypeError, "toString requires a Java object");
+		return nullptr;
+	}
+
+	if (value->getValue().l == nullptr)
+		return JPPyString::fromStringUTF8("null").keep();
+
+	if (cls == context->_java_lang_String)
+	{
+		PyObject *cache;
+		JPPyObject dict = JPPyObject::accept(PyObject_GenericGetDict(self, nullptr));
+		if (!dict.isNull())
+		{
+			cache = PyDict_GetItemString(dict.get(), "_jstr");
+			if (cache)
+			{
+				Py_INCREF(cache);
+				return cache;
+			}
+            auto jstr = (jstring) value->getValue().l;
+			string str;
+			str = frame.toStringUTF8(jstr);
+			cache = JPPyString::fromStringUTF8(str).keep();
+			PyDict_SetItemString(dict.get(), "_jstr", cache);
+			return cache;
+		}
+	}
+
+	// In general toString is not immutable, so we won't cache it.
+	return JPPyString::fromStringUTF8(frame.toString(value->getValue().l)).keep();
+	JP_PY_CATCH(nullptr);
+}
+
+PyObject *PyJPValue_getattro(PyObject *obj, PyObject *name)
+{
+	JP_PY_TRY("PyJPObject_getattro");
+	if (!PyUnicode_Check(name))
+	{
+		PyErr_Format(PyExc_TypeError,
+				"attribute name must be string, not '%.200s'",
+				Py_TYPE(name)->tp_name);
+		return nullptr;
+	}
+
+	// Private members are accessed directly
+	PyObject* pyattr = PyBaseObject_Type.tp_getattro(obj, name);
+	if (pyattr == nullptr)
+		return nullptr;
+	JPPyObject attr = JPPyObject::accept(pyattr);
+
+	// Private members go regardless
+	if (PyUnicode_GetLength(name) && PyUnicode_ReadChar(name, 0) == '_')
+		return attr.keep();
+
+	// Methods
+	if (Py_TYPE(attr.get()) == (PyTypeObject*) PyJPMethod_Type)
+		return attr.keep();
+
+	// Don't allow properties to be rewritten
+	if (!PyObject_IsInstance(attr.get(), (PyObject*) & PyProperty_Type))
+		return attr.keep();
+
+	PyErr_Format(PyExc_AttributeError, "Field '%U' is static", name);
+	return nullptr;
+	JP_PY_CATCH(nullptr);
+}
+
+int PyJPValue_setattro(PyObject *self, PyObject *name, PyObject *value)
+{
+	JP_PY_TRY("PyJPObject_setattro");
+
+	// Private members are accessed directly
+	if (PyUnicode_GetLength(name) && PyUnicode_ReadChar(name, 0) == '_')
+		return PyObject_GenericSetAttr(self, name, value);
+	JPPyObject f = JPPyObject::accept(PyJP_GetAttrDescriptor(Py_TYPE(self), name));
+	if (f.isNull())
+	{
+		PyErr_Format(PyExc_AttributeError, "Field '%U' is not found", name);
+		return -1;
+	}
+	descrsetfunc desc = Py_TYPE(f.get())->tp_descr_set;
+	if (desc != nullptr)
+		return desc(f.get(), self, value);
+
+	// Not a descriptor
+	PyErr_Format(PyExc_AttributeError,
+			"Field '%U' is not settable on Java '%s' object", name, Py_TYPE(self)->tp_name);
+	return -1;
+	JP_PY_CATCH(-1);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+// These are from the internal methods when we already have the jvalue
+
+void PyJPValue_assignJavaSlot(JPJavaFrame &frame, PyObject* self, const JPValue& value)
+{
+	Py_ssize_t offset = PyJPValue_getJavaSlotOffset(self);
+	// GCOVR_EXCL_START
+	if (offset == 0)
+	{
+		std::stringstream ss;
+		ss << "Missing Java slot on `" << Py_TYPE(self)->tp_name << "`";
+		JP_RAISE(PyExc_SystemError, ss.str());
+	}
+	// GCOVR_EXCL_STOP
+
+	auto* slot = (JPValue*) (((char*) self) + offset);
+	// GCOVR_EXCL_START
+	// This is a sanity check that should never trigger in normal operations.
+	if (slot->getClass() != nullptr)
+	{
+		JP_RAISE(PyExc_SystemError, "Slot assigned twice");
+	}
+	// GCOVR_EXCL_STOP
+	JPClass* cls = value.getClass();
+	if (cls != nullptr && !cls->isPrimitive())
+	{
+		jvalue q;
+		q.l = frame.NewGlobalRef(value.getValue().l);
+		*slot = JPValue(cls, q);
+	} else
+		*slot = value;
+}
+
+bool PyJPValue_isSetJavaSlot(PyObject* self)
+{
+	Py_ssize_t offset = PyJPValue_getJavaSlotOffset(self);
+	if (offset == 0)
+		return false;  // GCOVR_EXCL_LINE
+	auto* slot = (JPValue*) (((char*) self) + offset);
+	return slot->getClass() != nullptr;
+}

From fff9e6b9adde78c1c49d0f750a3bbfe59a9a940c Mon Sep 17 00:00:00 2001
From: Karl Nelson <nelson85@llnl.gov>
Date: Sat, 14 Sep 2024 15:37:37 -0700
Subject: [PATCH 09/13] Remove file used for comparison

---
 native/python/pyjp_value2.cpp | 331 ----------------------------------
 1 file changed, 331 deletions(-)
 delete mode 100644 native/python/pyjp_value2.cpp

diff --git a/native/python/pyjp_value2.cpp b/native/python/pyjp_value2.cpp
deleted file mode 100644
index 0a28ee36..00000000
--- a/native/python/pyjp_value2.cpp
+++ /dev/null
@@ -1,331 +0,0 @@
-/*****************************************************************************
-   Licensed 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.
-
-   See NOTICE file for details.
- *****************************************************************************/
-#include "jpype.h"
-#include "pyjp.h"
-#include "jp_stringtype.h"
-#include <Python.h>
-
-#ifdef __cplusplus
-extern "C"
-{
-#endif
-
-/**
- * Allocate a new Python object with a slot for Java.
- *
- * We need extra space to store our values, but because there
- * is no way to do so without disturbing the object layout.
- * Fortunately, Python already handles this for dict and weakref.
- * Python aligns the ends of the structure and increases the
- * base type size to add additional slots to a standard object.
- *
- * We will use the same trick to add an additional slot for Java
- * after the end of the object outside of where Python is looking.
- * As the memory is aligned this is safe to do.  We will use
- * the alloc and finalize slot to recognize which objects have this
- * extra slot appended.
- */
-PyObject* PyJPValue_alloc(PyTypeObject* type, Py_ssize_t nitems)
-{
-	JP_PY_TRY("PyJPValue_alloc");
-
-#if PY_VERSION_HEX<0x030c0000
-	Py_ssize_t refcnt = ((PyObject*) type)->ob_refcnt;
-	// Modification from Python to add size elements
-	const size_t size = _PyObject_VAR_SIZE(type, nitems + 1) + sizeof (JPValue);
-	PyObject *obj = (PyType_IS_GC(type)) ? _PyObject_GC_Malloc(size)
-    	: (PyObject *) PyObject_MALLOC(size);
-	if (obj == NULL)
-		return PyErr_NoMemory(); // GCOVR_EXCL_LINE
-	memset(obj, 0, size);
-
-	if (type->tp_itemsize == 0)
-		PyObject_Init(obj, type);
-	else
-		PyObject_InitVar((PyVarObject *) obj, type, nitems);
-
-	// This line is required to deal with Python bug (GH-11661)
-	// Some versions of Python fail to increment the reference counter of
-	// heap types properly.
-	if (refcnt == ((PyObject*) type)->ob_refcnt)
-		Py_INCREF(type);  // GCOVR_EXCL_LINE
-
-	if (PyType_IS_GC(type))
-		PyObject_GC_Track(obj);
-
-#else
-	// 1) allocate memory (+pre +inline)
-	// 2) gc link
-	// 3) init (set type, ref type, set ob_size)
-	// 4) set up inline dict past the length of object (if inline)
-	type->tp_basicsize += sizeof(JPValue);
-	PyObject* obj = PyType_GenericAlloc(type, nitems);
-	type->tp_basicsize -= sizeof(JPValue);
-#endif
-
-	JP_TRACE("alloc", type->tp_name, obj);
-	return obj;
-	JP_PY_CATCH(nullptr);
-}
-
-bool PyJPValue_hasJavaSlot(PyTypeObject* type)
-{
-	if (type == nullptr
-			|| type->tp_alloc != (allocfunc) PyJPValue_alloc
-			|| type->tp_finalize != (destructor) PyJPValue_finalize)
-		return false;  // GCOVR_EXCL_LINE
-	return true;
-}
-
-Py_ssize_t PyJPValue_getJavaSlotOffset(PyObject* self)
-{
-	PyTypeObject *type = Py_TYPE(self);
-	if (type == nullptr
-			|| type->tp_alloc != (allocfunc) PyJPValue_alloc
-			|| type->tp_finalize != (destructor) PyJPValue_finalize)
-    {
-		return 0;
-    }
-
-	Py_ssize_t offset = 0;
-	Py_ssize_t sz = 0;
-    
-#if PY_VERSION_HEX>=0x030c0000
-	// starting in 3.12 there is no longer ob_size in PyLong
-	if (PyType_HasFeature(self->ob_type, Py_TPFLAGS_LONG_SUBCLASS))
-		sz = (((PyLongObject*)self)->long_value.lv_tag) >> 3;  // Private NON_SIZE_BITS
-	else 
-#endif
-	if (type->tp_itemsize != 0)
-		sz = Py_SIZE(self);
-	// PyLong abuses ob_size with negative values prior to 3.12
-	if (sz < 0)
-		sz = -sz;
-	if (type->tp_itemsize == 0)
-		offset = _PyObject_VAR_SIZE(type, 1);
-	else
-		offset = _PyObject_VAR_SIZE(type, sz + 1);
-	return offset;
-}
-
-/**
- * Get the Java value if attached.
- *
- * The Java class is guaranteed not to be nullptr on success.
- *
- * @param obj
- * @return the Java value or 0 if not found.
- */
-JPValue* PyJPValue_getJavaSlot(PyObject* self)
-{
-	Py_ssize_t offset = PyJPValue_getJavaSlotOffset(self);
-	if (offset == 0)
-		return nullptr;
-	auto value = (JPValue*) (((char*) self) + offset);
-	if (value->getClass() == nullptr)
-		return nullptr;
-	return value;
-}
-
-void PyJPValue_free(void* obj)
-{
-	JP_PY_TRY("PyJPValue_free", obj);
-	// Normally finalize is not run on simple classes.
-	PyTypeObject *type = Py_TYPE(obj);
-	if (type->tp_finalize != nullptr)
-		type->tp_finalize((PyObject*) obj);
-	if (type->tp_flags & Py_TPFLAGS_HAVE_GC)
-		PyObject_GC_Del(obj);
-	else
-		PyObject_Free(obj);  // GCOVR_EXCL_LINE
-	JP_PY_CATCH_NONE();
-}
-
-void PyJPValue_finalize(void* obj)
-{
-	JP_PY_TRY("PyJPValue_finalize", obj);
-	JP_TRACE("type", Py_TYPE(obj)->tp_name);
-	JPValue* value = PyJPValue_getJavaSlot((PyObject*) obj);
-	if (value == nullptr)
-		return;
-	JPContext *context = JPContext_global;
-	if (context == nullptr || !context->isRunning())
-		return;
-	JPJavaFrame frame = JPJavaFrame::outer(context);
-	JPClass* cls = value->getClass();
-	// This one can't check for initialized because we may need to delete a stale
-	// resource after shutdown.
-	if (cls != nullptr && context->isRunning() && !cls->isPrimitive())
-	{
-		JP_TRACE("Value", cls->getCanonicalName(), &(value->getValue()));
-		JP_TRACE("Dereference object");
-		context->ReleaseGlobalRef(value->getValue().l);
-		*value = JPValue();
-	}
-	JP_PY_CATCH_NONE();
-}
-
-/** This is the way to convert an object into a python string. */
-PyObject* PyJPValue_str(PyObject* self)
-{
-	JP_PY_TRY("PyJPValue_str", self);
-	JPContext *context = PyJPModule_getContext();
-	JPJavaFrame frame = JPJavaFrame::outer(context);
-	JPValue* value = PyJPValue_getJavaSlot(self);
-	if (value == nullptr)
-	{
-		PyErr_SetString(PyExc_TypeError, "Not a Java value");
-		return nullptr;
-	}
-
-	JPClass* cls = value->getClass();
-	if (cls->isPrimitive())
-	{
-		PyErr_SetString(PyExc_TypeError, "toString requires a Java object");
-		return nullptr;
-	}
-
-	if (value->getValue().l == nullptr)
-		return JPPyString::fromStringUTF8("null").keep();
-
-	if (cls == context->_java_lang_String)
-	{
-		PyObject *cache;
-		JPPyObject dict = JPPyObject::accept(PyObject_GenericGetDict(self, nullptr));
-		if (!dict.isNull())
-		{
-			cache = PyDict_GetItemString(dict.get(), "_jstr");
-			if (cache)
-			{
-				Py_INCREF(cache);
-				return cache;
-			}
-            auto jstr = (jstring) value->getValue().l;
-			string str;
-			str = frame.toStringUTF8(jstr);
-			cache = JPPyString::fromStringUTF8(str).keep();
-			PyDict_SetItemString(dict.get(), "_jstr", cache);
-			return cache;
-		}
-	}
-
-	// In general toString is not immutable, so we won't cache it.
-	return JPPyString::fromStringUTF8(frame.toString(value->getValue().l)).keep();
-	JP_PY_CATCH(nullptr);
-}
-
-PyObject *PyJPValue_getattro(PyObject *obj, PyObject *name)
-{
-	JP_PY_TRY("PyJPObject_getattro");
-	if (!PyUnicode_Check(name))
-	{
-		PyErr_Format(PyExc_TypeError,
-				"attribute name must be string, not '%.200s'",
-				Py_TYPE(name)->tp_name);
-		return nullptr;
-	}
-
-	// Private members are accessed directly
-	PyObject* pyattr = PyBaseObject_Type.tp_getattro(obj, name);
-	if (pyattr == nullptr)
-		return nullptr;
-	JPPyObject attr = JPPyObject::accept(pyattr);
-
-	// Private members go regardless
-	if (PyUnicode_GetLength(name) && PyUnicode_ReadChar(name, 0) == '_')
-		return attr.keep();
-
-	// Methods
-	if (Py_TYPE(attr.get()) == (PyTypeObject*) PyJPMethod_Type)
-		return attr.keep();
-
-	// Don't allow properties to be rewritten
-	if (!PyObject_IsInstance(attr.get(), (PyObject*) & PyProperty_Type))
-		return attr.keep();
-
-	PyErr_Format(PyExc_AttributeError, "Field '%U' is static", name);
-	return nullptr;
-	JP_PY_CATCH(nullptr);
-}
-
-int PyJPValue_setattro(PyObject *self, PyObject *name, PyObject *value)
-{
-	JP_PY_TRY("PyJPObject_setattro");
-
-	// Private members are accessed directly
-	if (PyUnicode_GetLength(name) && PyUnicode_ReadChar(name, 0) == '_')
-		return PyObject_GenericSetAttr(self, name, value);
-	JPPyObject f = JPPyObject::accept(PyJP_GetAttrDescriptor(Py_TYPE(self), name));
-	if (f.isNull())
-	{
-		PyErr_Format(PyExc_AttributeError, "Field '%U' is not found", name);
-		return -1;
-	}
-	descrsetfunc desc = Py_TYPE(f.get())->tp_descr_set;
-	if (desc != nullptr)
-		return desc(f.get(), self, value);
-
-	// Not a descriptor
-	PyErr_Format(PyExc_AttributeError,
-			"Field '%U' is not settable on Java '%s' object", name, Py_TYPE(self)->tp_name);
-	return -1;
-	JP_PY_CATCH(-1);
-}
-
-#ifdef __cplusplus
-}
-#endif
-
-// These are from the internal methods when we already have the jvalue
-
-void PyJPValue_assignJavaSlot(JPJavaFrame &frame, PyObject* self, const JPValue& value)
-{
-	Py_ssize_t offset = PyJPValue_getJavaSlotOffset(self);
-	// GCOVR_EXCL_START
-	if (offset == 0)
-	{
-		std::stringstream ss;
-		ss << "Missing Java slot on `" << Py_TYPE(self)->tp_name << "`";
-		JP_RAISE(PyExc_SystemError, ss.str());
-	}
-	// GCOVR_EXCL_STOP
-
-	auto* slot = (JPValue*) (((char*) self) + offset);
-	// GCOVR_EXCL_START
-	// This is a sanity check that should never trigger in normal operations.
-	if (slot->getClass() != nullptr)
-	{
-		JP_RAISE(PyExc_SystemError, "Slot assigned twice");
-	}
-	// GCOVR_EXCL_STOP
-	JPClass* cls = value.getClass();
-	if (cls != nullptr && !cls->isPrimitive())
-	{
-		jvalue q;
-		q.l = frame.NewGlobalRef(value.getValue().l);
-		*slot = JPValue(cls, q);
-	} else
-		*slot = value;
-}
-
-bool PyJPValue_isSetJavaSlot(PyObject* self)
-{
-	Py_ssize_t offset = PyJPValue_getJavaSlotOffset(self);
-	if (offset == 0)
-		return false;  // GCOVR_EXCL_LINE
-	auto* slot = (JPValue*) (((char*) self) + offset);
-	return slot->getClass() != nullptr;
-}

From 6bea925142d0940b96dc48714898a08e8004ca54 Mon Sep 17 00:00:00 2001
From: Karl Nelson <nelson85@llnl.gov>
Date: Sun, 15 Sep 2024 10:12:08 -0700
Subject: [PATCH 10/13] Switch to another hack

---
 native/python/pyjp_module.cpp |   2 +
 native/python/pyjp_value.cpp  | 113 +++++++++++++++++++---------------
 2 files changed, 64 insertions(+), 51 deletions(-)

diff --git a/native/python/pyjp_module.cpp b/native/python/pyjp_module.cpp
index a2110efe..80d87f61 100644
--- a/native/python/pyjp_module.cpp
+++ b/native/python/pyjp_module.cpp
@@ -37,6 +37,7 @@ extern void PyJPNumber_initType(PyObject* module);
 extern void PyJPClassHints_initType(PyObject* module);
 extern void PyJPPackage_initType(PyObject* module);
 extern void PyJPChar_initType(PyObject* module);
+extern void PyJPValue_initType(PyObject* module);
 
 static PyObject *PyJPModule_convertBuffer(JPPyBuffer& buffer, PyObject *dtype);
 
@@ -739,6 +740,7 @@ PyMODINIT_FUNC PyInit__jpype()
 
 	PyJPClassMagic = PyDict_New();
 	// Initialize each of the python extension types
+	PyJPValue_initType(module);
 	PyJPClass_initType(module);
 	PyJPObject_initType(module);
 
diff --git a/native/python/pyjp_value.cpp b/native/python/pyjp_value.cpp
index 629f8983..35cd780c 100644
--- a/native/python/pyjp_value.cpp
+++ b/native/python/pyjp_value.cpp
@@ -23,6 +23,9 @@ extern "C"
 {
 #endif
 
+// Create a dummy type which we will use only for allocation
+PyTypeObject* PyJPAlloc_Type = nullptr;
+
 /**
  * Allocate a new Python object with a slot for Java.
  *
@@ -42,58 +45,31 @@ PyObject* PyJPValue_alloc(PyTypeObject* type, Py_ssize_t nitems)
 {
 	JP_PY_TRY("PyJPValue_alloc");
 
-#if PY_VERSION_HEX<0x030b0000
-	Py_ssize_t refcnt = ((PyObject*) type)->ob_refcnt;
-	const size_t size = _PyObject_VAR_SIZE(type, nitems + 1) + sizeof (JPValue);
-	// Modification from Python to add size elements
-	PyObject *obj = (PyType_IS_GC(type)) ? _PyObject_GC_Malloc(size)
-		: (PyObject *) PyObject_MALLOC(size);
-	if (obj == NULL)
-		return PyErr_NoMemory(); // GCOVR_EXCL_LINE
-	memset(obj, 0, size);
-
-	if (type->tp_itemsize == 0)
-		PyObject_Init(obj, type);
-	else
-		PyObject_InitVar((PyVarObject *) obj, type, nitems);
-
-	// This line is required to deal with Python bug (GH-11661)
-	// Some versions of Python fail to increment the reference counter of
-	// heap types properly.
-	if (refcnt == ((PyObject*) type)->ob_refcnt)
-		Py_INCREF(type);  // GCOVR_EXCL_LINE
-
-	if (PyType_IS_GC(type))
-		PyObject_GC_Track(obj);
-
-#elif PY_VERSION_HEX<0x030c0000
-	// At some point Python 3.11 backported changes corresponding to Python 3.12
-	// without the support for allocation of method, and with bugs.  We have
-	// to mutilate the base size of the object to get the extra memory we need
-	// And the size we must request appears to be larger tha needed.  This
-	// coresponds to the same bug in PyUnstable_Object_GC_NewWithExtraData.
-	//
-	// This is a horrible hack and I can't guarantee anything about the stability 
-	// of it!
-	type->tp_basicsize += 2*sizeof(JPValue);
-	PyObject* obj = PyType_GenericAlloc(type, nitems);
-	type->tp_basicsize -= 2*sizeof(JPValue);
-#else
-	PyObject* obj = nullptr;
-	if (type->tp_itemsize != 0) {
-		// There is no corresponding PyUnstable_VarObject_GC_NewWithExtraData method 
-		// Without one we are just going to aske for our needed memory though backdoor methods.
-		Py_ssize_t extra = (sizeof(JPValue))/type->tp_itemsize;
-		if (extra == 0)
-			extra = 1;
-		obj = PyType_GenericAlloc(type, nitems+extra);
-		Py_SET_SIZE(obj, nitems);
-	}
-	else {
-		// why do we need twice the allocation.   Not sure, nothing in our logic says that it should be necessary
-		obj = PyUnstable_Object_GC_NewWithExtraData(type, 2*sizeof(JPValue));
-	}
+#if PY_VERSION_HEX >= 0x030d0000
+	// This flag will try to place the dictionary are part of the object which 
+	// adds an unknown number of bytes to the end of the object making it impossible
+	// to attach our needed data.  If we kill the flag then we get usable behavior.
+	if (PyType_HasFeature(type, Py_TPFLAGS_INLINE_VALUES)) {
+        PyErr_Format(PyExc_RuntimeError, "Unhandled object layout");
+        return 0;
+    }
 #endif
+   
+    // Mutate the allocator type 
+    PyJPAlloc_Type->tp_flags = type->tp_flags;
+    PyJPAlloc_Type->tp_basicsize = type->tp_basicsize + sizeof (JPValue);
+    PyJPAlloc_Type->tp_itemsize = type->tp_itemsize;
+
+    // Create a new allocation for the dummy type
+	PyObject* obj = PyType_GenericAlloc(PyJPAlloc_Type, nitems);
+
+    // Watch for memory errors
+    if (obj == nullptr)
+        return nullptr;
+
+    // Polymorph the type to match our desired type
+    obj->ob_type = type;
+    Py_INCREF(type);
 
 	JP_TRACE("alloc", type->tp_name, obj);
 	return obj;
@@ -348,3 +324,38 @@ bool PyJPValue_isSetJavaSlot(PyObject* self)
 	auto* slot = (JPValue*) (((char*) self) + offset);
 	return slot->getClass() != nullptr;
 }
+
+/***************** Create a dummy type for use when allocating. ************************/
+static int PyJPAlloc_traverse(PyObject *self, visitproc visit, void *arg)
+{
+	return 0;
+}
+
+static int PyJPAlloc_clear(PyObject *self)
+{
+	return 0;
+}
+
+
+static PyType_Slot allocSlots[] = {
+	{ Py_tp_traverse, (void*) PyJPAlloc_traverse},
+	{ Py_tp_clear, (void*) PyJPAlloc_clear},
+    {0, NULL}  // Sentinel
+};
+
+static PyType_Spec allocSpec = {
+	"_jpype._JAlloc",
+	sizeof(PyObject),
+	0,
+	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC,
+	allocSlots
+};
+
+void PyJPValue_initType(PyObject* module)
+{
+	PyObject *bases = PyTuple_Pack(1, &PyBaseObject_Type);
+	PyJPAlloc_Type = (PyTypeObject*) PyType_FromSpecWithBases(&allocSpec, bases);
+	Py_DECREF(bases);
+    Py_INCREF(PyJPAlloc_Type);
+	JP_PY_CHECK();
+}

From bde9e6b0df5f4d67b585a02c09e8ed38871ccd38 Mon Sep 17 00:00:00 2001
From: Karl Nelson <nelson85@llnl.gov>
Date: Sun, 15 Sep 2024 10:18:52 -0700
Subject: [PATCH 11/13] Fix tabs

---
 native/python/pyjp_value.cpp | 32 ++++++++++++++++----------------
 1 file changed, 16 insertions(+), 16 deletions(-)

diff --git a/native/python/pyjp_value.cpp b/native/python/pyjp_value.cpp
index 35cd780c..07243c9a 100644
--- a/native/python/pyjp_value.cpp
+++ b/native/python/pyjp_value.cpp
@@ -50,26 +50,26 @@ PyObject* PyJPValue_alloc(PyTypeObject* type, Py_ssize_t nitems)
 	// adds an unknown number of bytes to the end of the object making it impossible
 	// to attach our needed data.  If we kill the flag then we get usable behavior.
 	if (PyType_HasFeature(type, Py_TPFLAGS_INLINE_VALUES)) {
-        PyErr_Format(PyExc_RuntimeError, "Unhandled object layout");
-        return 0;
-    }
+		PyErr_Format(PyExc_RuntimeError, "Unhandled object layout");
+		return 0;
+	}
 #endif
    
-    // Mutate the allocator type 
-    PyJPAlloc_Type->tp_flags = type->tp_flags;
-    PyJPAlloc_Type->tp_basicsize = type->tp_basicsize + sizeof (JPValue);
-    PyJPAlloc_Type->tp_itemsize = type->tp_itemsize;
+	// Mutate the allocator type 
+	PyJPAlloc_Type->tp_flags = type->tp_flags;
+	PyJPAlloc_Type->tp_basicsize = type->tp_basicsize + sizeof (JPValue);
+	PyJPAlloc_Type->tp_itemsize = type->tp_itemsize;
 
-    // Create a new allocation for the dummy type
+	// Create a new allocation for the dummy type
 	PyObject* obj = PyType_GenericAlloc(PyJPAlloc_Type, nitems);
 
-    // Watch for memory errors
-    if (obj == nullptr)
-        return nullptr;
+	// Watch for memory errors
+	if (obj == nullptr)
+		return nullptr;
 
-    // Polymorph the type to match our desired type
-    obj->ob_type = type;
-    Py_INCREF(type);
+	// Polymorph the type to match our desired type
+	obj->ob_type = type;
+	Py_INCREF(type);
 
 	JP_TRACE("alloc", type->tp_name, obj);
 	return obj;
@@ -340,7 +340,7 @@ static int PyJPAlloc_clear(PyObject *self)
 static PyType_Slot allocSlots[] = {
 	{ Py_tp_traverse, (void*) PyJPAlloc_traverse},
 	{ Py_tp_clear, (void*) PyJPAlloc_clear},
-    {0, NULL}  // Sentinel
+	{0, NULL}  // Sentinel
 };
 
 static PyType_Spec allocSpec = {
@@ -356,6 +356,6 @@ void PyJPValue_initType(PyObject* module)
 	PyObject *bases = PyTuple_Pack(1, &PyBaseObject_Type);
 	PyJPAlloc_Type = (PyTypeObject*) PyType_FromSpecWithBases(&allocSpec, bases);
 	Py_DECREF(bases);
-    Py_INCREF(PyJPAlloc_Type);
+	Py_INCREF(PyJPAlloc_Type);
 	JP_PY_CHECK();
 }

From 260bcf59dacd3a71634d6fef2d55fce78b60da3c Mon Sep 17 00:00:00 2001
From: Karl Nelson <nelson85@llnl.gov>
Date: Sun, 15 Sep 2024 10:33:56 -0700
Subject: [PATCH 12/13] Attempt to add critical section

---
 native/python/pyjp_value.cpp | 23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/native/python/pyjp_value.cpp b/native/python/pyjp_value.cpp
index 07243c9a..f3b167d6 100644
--- a/native/python/pyjp_value.cpp
+++ b/native/python/pyjp_value.cpp
@@ -17,12 +17,15 @@
 #include "pyjp.h"
 #include "jp_stringtype.h"
 #include <Python.h>
+#include <mutex>
 
 #ifdef __cplusplus
 extern "C"
 {
 #endif
 
+std::mutex mtx;
+
 // Create a dummy type which we will use only for allocation
 PyTypeObject* PyJPAlloc_Type = nullptr;
 
@@ -54,14 +57,18 @@ PyObject* PyJPValue_alloc(PyTypeObject* type, Py_ssize_t nitems)
 		return 0;
 	}
 #endif
-   
-	// Mutate the allocator type 
-	PyJPAlloc_Type->tp_flags = type->tp_flags;
-	PyJPAlloc_Type->tp_basicsize = type->tp_basicsize + sizeof (JPValue);
-	PyJPAlloc_Type->tp_itemsize = type->tp_itemsize;
-
-	// Create a new allocation for the dummy type
-	PyObject* obj = PyType_GenericAlloc(PyJPAlloc_Type, nitems);
+
+	PyObject* obj = nullptr;
+	{  
+		std::lock_guard<std::mutex> lock(mtx);
+		// Mutate the allocator type 
+		PyJPAlloc_Type->tp_flags = type->tp_flags;
+		PyJPAlloc_Type->tp_basicsize = type->tp_basicsize + sizeof (JPValue);
+		PyJPAlloc_Type->tp_itemsize = type->tp_itemsize;
+	
+		// Create a new allocation for the dummy type
+		obj = PyType_GenericAlloc(PyJPAlloc_Type, nitems);
+	}
 
 	// Watch for memory errors
 	if (obj == nullptr)

From edeafa93aa0bad6e9b8e5d37e2b1218583f65be1 Mon Sep 17 00:00:00 2001
From: "Martin K. Scherer" <marscher@users.noreply.github.com>
Date: Mon, 16 Sep 2024 13:22:26 +0200
Subject: [PATCH 13/13] try to fix python 3.13 rc version

---
 .azure/build.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.azure/build.yml b/.azure/build.yml
index a8bf0c1b..e3d8bf59 100644
--- a/.azure/build.yml
+++ b/.azure/build.yml
@@ -73,7 +73,7 @@ jobs:
         jdk.version: '17'
       linux-py3.13-jdk17:
         imageName: "ubuntu-latest"
-        python.version: '3.13.0-rc.1'
+        python.version: '3.13.0-rc.2'
         jdk.version: '17'
       # Windows
       windows-py3.8-jdk8: