bpo-44590: Lazily allocate frame objects (GH-27077)

* Convert "specials" array to InterpreterFrame struct, adding f_lasti, f_state and other non-debug FrameObject fields to it.

* Refactor, calls pushing the call to the interpreter upward toward _PyEval_Vector.

* Compute f_back when on thread stack, only filling in value when frame object outlives stack invocation.

* Move ownership of InterpreterFrame in generator from frame object to generator object.

* Do not create frame objects for Python calls.

* Do not create frame objects for generators.

1 files changed, 5 insertions, 2 deletions

diff --git a/Include/internal/pycore_ceval.h b/Include/internal/pycore_ceval.h
index f573c3e..66ddc99 100644
--- a/Include/internal/pycore_ceval.h
+++ b/Include/internal/pycore_ceval.h
@@ -41,9 +41,9 @@ extern PyObject *_PyEval_BuiltinsFromGlobals(
 
 
 static inline PyObject*
-_PyEval_EvalFrame(PyThreadState *tstate, PyFrameObject *f, int throwflag)
+_PyEval_EvalFrame(PyThreadState *tstate, struct _interpreter_frame *frame, int throwflag)
 {
-    return tstate->interp->eval_frame(tstate, f, throwflag);
+    return tstate->interp->eval_frame(tstate, frame, throwflag);
 }
 
 extern PyObject *
@@ -107,6 +107,9 @@ static inline void _Py_LeaveRecursiveCall_inline(void)  {
 
 #define Py_LeaveRecursiveCall() _Py_LeaveRecursiveCall_inline()
 
+struct _interpreter_frame *_PyEval_GetFrame(void);
+
+PyObject *_Py_MakeCoro(PyFrameConstructor *, struct _interpreter_frame *);
 
 #ifdef __cplusplus
 }