From 019976e2db4899a5ac30f497aa45b51335b024ec Mon Sep 17 00:00:00 2001
From: Jose <pepone@users.noreply.github.com>
Date: Thu, 17 Oct 2024 10:09:57 +0200
Subject: [PATCH] Python 3.13 build fixes (#2910)

---
 python/modules/IcePy/Types.cpp | 30 +++++++++++-------------------
 python/modules/IcePy/Util.cpp  |  9 ++-------
 2 files changed, 13 insertions(+), 26 deletions(-)

diff --git a/python/modules/IcePy/Types.cpp b/python/modules/IcePy/Types.cpp
index 0dc4baa3bda..2228afcae3d 100644
--- a/python/modules/IcePy/Types.cpp
+++ b/python/modules/IcePy/Types.cpp
@@ -296,14 +296,7 @@ IcePy::StreamUtil::setSlicedDataMember(PyObject* obj, const Ice::SlicedDataPtr&
         assert(_sliceInfoType);
     }
 
-    IcePy::PyObjectHandle args{PyTuple_New(0)};
-    if (!args.get())
-    {
-        assert(PyErr_Occurred());
-        throw AbortMarshaling();
-    }
-
-    PyObjectHandle sd{PyEval_CallObject(_slicedDataType, args.get())};
+    PyObjectHandle sd{PyObject_CallObject(_slicedDataType, nullptr)};
     if (!sd.get())
     {
         assert(PyErr_Occurred());
@@ -329,7 +322,7 @@ IcePy::StreamUtil::setSlicedDataMember(PyObject* obj, const Ice::SlicedDataPtr&
     int i = 0;
     for (vector<Ice::SliceInfoPtr>::const_iterator p = slicedData->slices.begin(); p != slicedData->slices.end(); ++p)
     {
-        PyObjectHandle slice{PyEval_CallObject(_sliceInfoType, args.get())};
+        PyObjectHandle slice{PyObject_CallObject(_sliceInfoType, nullptr)};
         if (!slice.get())
         {
             assert(PyErr_Occurred());
@@ -1476,18 +1469,17 @@ IcePy::SequenceInfo::marshal(
             Py_ssize_t sz = 0;
             if (p != Py_None)
             {
-                const void* buf = 0;
-                if (PyObject_AsReadBuffer(p, &buf, &sz) == 0)
+                Py_buffer pybuf;
+                if (pi && PyObject_GetBuffer(p, &pybuf, PyBUF_SIMPLE | PyBUF_FORMAT) == 0)
                 {
-                    if (pi->kind == PrimitiveInfo::KindString)
-                    {
-                        PyErr_Format(PyExc_ValueError, "expected sequence value");
-                        throw AbortMarshaling();
-                    }
+                    // Strings are handled as variable length types above.
+                    assert(pi->kind != PrimitiveInfo::KindString);
+                    sz = pybuf.len;
+                    PyBuffer_Release(&pybuf);
                 }
                 else
                 {
-                    PyErr_Clear(); // PyObject_AsReadBuffer sets an exception on failure.
+                    PyErr_Clear(); // PyObject_GetBuffer sets an exception on failure.
 
                     PyObjectHandle fs;
                     if (pi)
@@ -1711,7 +1703,7 @@ IcePy::SequenceInfo::marshalPrimitiveSequence(const PrimitiveInfoPtr& pi, PyObje
     if (pi->kind != PrimitiveInfo::KindString)
     {
         //
-        // With Python 3 and greater we marshal sequences of pritive types using the new
+        // With Python 3 and greater we marshal sequences of primitive types using the new
         // buffer protocol when possible, for older versions we use the old buffer protocol.
         //
         Py_buffer pybuf;
@@ -1820,7 +1812,7 @@ IcePy::SequenceInfo::marshalPrimitiveSequence(const PrimitiveInfoPtr& pi, PyObje
         }
         else
         {
-            PyErr_Clear(); // PyObject_GetBuffer/PyObject_AsReadBuffer sets an exception on failure.
+            PyErr_Clear(); // PyObject_GetBuffer sets an exception on failure.
         }
     }
 
diff --git a/python/modules/IcePy/Util.cpp b/python/modules/IcePy/Util.cpp
index 63d2f54321e..8e6c7c16499 100644
--- a/python/modules/IcePy/Util.cpp
+++ b/python/modules/IcePy/Util.cpp
@@ -611,12 +611,7 @@ PyObject*
 IcePy::createExceptionInstance(PyObject* type)
 {
     assert(PyExceptionClass_Check(type));
-    IcePy::PyObjectHandle args{PyTuple_New(0)};
-    if (!args.get())
-    {
-        return nullptr;
-    }
-    return PyEval_CallObject(type, args.get());
+    return PyObject_CallObject(type, nullptr);
 }
 
 namespace
@@ -651,7 +646,7 @@ namespace
             // PyTuple_SetItem takes ownership of the args[i] reference.
             PyTuple_SetItem(pArgs.get(), static_cast<Py_ssize_t>(i), args[i]);
         }
-        return PyEval_CallObject(type, pArgs.get());
+        return PyObject_CallObject(type, pArgs.get());
     }
 }