bpo-45256: Remove the usage of the C stack in Python to Python calls (GH-28488)

Ths commit inlines calls to Python functions in the eval loop and steals all the arguments in the call from the caller for
performance.

1 files changed, 20 insertions, 0 deletions

diff --git a/Objects/tupleobject.c b/Objects/tupleobject.c
index e64b93b..018e738 100644
--- a/Objects/tupleobject.c
+++ b/Objects/tupleobject.c
@@ -484,6 +484,26 @@ _PyTuple_FromArray(PyObject *const *src, Py_ssize_t n)
     return (PyObject *)tuple;
 }
 
+PyObject *
+_PyTuple_FromArraySteal(PyObject *const *src, Py_ssize_t n)
+{
+    if (n == 0) {
+        return tuple_get_empty();
+    }
+
+    PyTupleObject *tuple = tuple_alloc(n);
+    if (tuple == NULL) {
+        return NULL;
+    }
+    PyObject **dst = tuple->ob_item;
+    for (Py_ssize_t i = 0; i < n; i++) {
+        PyObject *item = src[i];
+        dst[i] = item;
+    }
+    _PyObject_GC_TRACK(tuple);
+    return (PyObject *)tuple;
+}
+
 static PyObject *
 tupleslice(PyTupleObject *a, Py_ssize_t ilow,
            Py_ssize_t ihigh)