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.

2 files changed, 3 insertions, 0 deletions

diff --git a/Include/internal/pycore_frame.h b/Include/internal/pycore_frame.h
index 489e115..7e63f58 100644
--- a/Include/internal/pycore_frame.h
+++ b/Include/internal/pycore_frame.h
@@ -31,6 +31,7 @@ typedef struct _interpreter_frame {
     int f_lasti;       /* Last instruction if called */
     int stacktop;     /* Offset of TOS from localsplus  */
     PyFrameState f_state;  /* What state the frame is in */
+    int depth; /* Depth of the frame in a ceval loop */
     PyObject *localsplus[1];
 } InterpreterFrame;
 
@@ -85,6 +86,7 @@ _PyFrame_InitializeSpecials(
     frame->generator = NULL;
     frame->f_lasti = -1;
     frame->f_state = FRAME_CREATED;
+    frame->depth = 0;
 }
 
 /* Gets the pointer to the locals array
diff --git a/Include/internal/pycore_tuple.h b/Include/internal/pycore_tuple.h
index d1d0d2a..79c827f 100644
--- a/Include/internal/pycore_tuple.h
+++ b/Include/internal/pycore_tuple.h
@@ -13,6 +13,7 @@ extern "C" {
 #define _PyTuple_ITEMS(op) (_PyTuple_CAST(op)->ob_item)
 
 extern PyObject *_PyTuple_FromArray(PyObject *const *, Py_ssize_t);
+extern PyObject *_PyTuple_FromArraySteal(PyObject *const *, Py_ssize_t);
 
 #ifdef __cplusplus
 }