GH-127705: Use _PyStackRefs in the default build.

Include/internal/pycore_ceval.h

@@ -342,7 +342,7 @@ _Py_eval_breaker_bit_is_set(PyThreadState *tstate, uintptr_t bit)
 void _Py_set_eval_breaker_bit_all(PyInterpreterState *interp, uintptr_t bit);
 void _Py_unset_eval_breaker_bit_all(PyInterpreterState *interp, uintptr_t bit);
 
-PyAPI_FUNC(PyObject *) _PyFloat_FromDouble_ConsumeInputs(_PyStackRef left, _PyStackRef right, double value);
+PyAPI_FUNC(_PyStackRef) _PyFloat_FromDouble_ConsumeInputs(_PyStackRef left, _PyStackRef right, double value);
 
 #ifdef __cplusplus
 }

Include/internal/pycore_frame.h

@@ -148,17 +148,26 @@ _PyFrame_NumSlotsForCodeObject(PyCodeObject *code)
 
 static inline void _PyFrame_Copy(_PyInterpreterFrame *src, _PyInterpreterFrame *dest)
 {
- *dest = *src;
+ dest->f_executable = PyStackRef_MakeHeapSafe(src->f_executable);
+ // Don't leave a dangling pointer to the old frame when creating generators
+ // and coroutines:
+ dest->previous = NULL;
+ dest->f_funcobj = PyStackRef_MakeHeapSafe(src->f_funcobj);
+ dest->f_globals = src->f_globals;
+ dest->f_builtins = src->f_builtins;
+ dest->f_locals = src->f_locals;
+ dest->frame_obj = src->frame_obj;
+ dest->instr_ptr = src->instr_ptr;
+#ifdef Py_GIL_DISABLED
+ dest->tlbc_index = src->tlbc_index;
+#endif
  assert(src->stackpointer != NULL);
  int stacktop = (int)(src->stackpointer - src->localsplus);
- assert(stacktop >= _PyFrame_GetCode(src)->co_nlocalsplus);
+ assert(stacktop >= 0);
  dest->stackpointer = dest->localsplus + stacktop;
- for (int i = 1; i < stacktop; i++){
- dest->localsplus[i] = src->localsplus[i];
+ for (int i = 0; i < stacktop; i++){
+ dest->localsplus[i] = PyStackRef_MakeHeapSafe(src->localsplus[i]);
  }
- // Don't leave a dangling pointer to the old frame when creating generators
- // and coroutines:
- dest->previous = NULL;
 }
 
 #ifdef Py_GIL_DISABLED
@@ -393,7 +402,7 @@ _PyFrame_PushTrampolineUnchecked(PyThreadState *tstate, PyCodeObject *code, int
 
 PyAPI_FUNC(_PyInterpreterFrame *)
 _PyEvalFramePushAndInit(PyThreadState *tstate, _PyStackRef func,
- PyObject *locals, _PyStackRef const* args,
+ PyObject *locals, _PyStackRef const *args,
  size_t argcount, PyObject *kwnames,
  _PyInterpreterFrame *previous);
 

Include/internal/pycore_object.h

@@ -82,7 +82,7 @@ PyAPI_FUNC(int) _PyObject_IsFreed(PyObject *);
 #define _PyObject_HEAD_INIT(type) \
 {\
  .ob_refcnt = _Py_IMMORTAL_INITIAL_REFCNT, \
- .ob_flags = _Py_STATICALLY_ALLOCATED_FLAG, \
+ .ob_flags = _Py_STATIC_FLAG_BITS, \
  .ob_type = (type) \
  }
 #else