bpo-43683: Streamline YIELD_VALUE and SEND (GH-30723)

* Split YIELD_VALUE into ASYNC_GEN_WRAP; YIELD_VALUE for async generators.

* Split SEND into SEND; YIELD_VALUE.

* Document new opcodes.

1 files changed, 14 insertions, 21 deletions

diff --git a/Python/ceval.c b/Python/ceval.c
index 9aaddd9..2c524ab 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -2650,32 +2650,25 @@ handle_eval_breaker:
             }
             assert (gen_status == PYGEN_NEXT);
             assert (retval != NULL);
-            frame->f_state = FRAME_SUSPENDED;
-            _PyFrame_SetStackPointer(frame, stack_pointer);
-            TRACE_FUNCTION_EXIT();
-            DTRACE_FUNCTION_EXIT();
-            _Py_LeaveRecursiveCall(tstate);
-            /* Restore previous cframe and return. */
-            tstate->cframe = cframe.previous;
-            tstate->cframe->use_tracing = cframe.use_tracing;
-            assert(tstate->cframe->current_frame == frame->previous);
-            assert(!_PyErr_Occurred(tstate));
-            return retval;
+            PUSH(retval);
+            DISPATCH();
+        }
+
+        TARGET(ASYNC_GEN_WRAP) {
+            PyObject *v = TOP();
+            assert(frame->f_code->co_flags & CO_ASYNC_GENERATOR);
+            PyObject *w = _PyAsyncGenValueWrapperNew(v);
+            if (w == NULL) {
+                goto error;
+            }
+            SET_TOP(w);
+            Py_DECREF(v);
+            DISPATCH();
         }
 
         TARGET(YIELD_VALUE) {
             assert(frame->is_entry);
             PyObject *retval = POP();
-
-            if (frame->f_code->co_flags & CO_ASYNC_GENERATOR) {
-                PyObject *w = _PyAsyncGenValueWrapperNew(retval);
-                Py_DECREF(retval);
-                if (w == NULL) {
-                    retval = NULL;
-                    goto error;
-                }
-                retval = w;
-            }
             frame->f_state = FRAME_SUSPENDED;
             _PyFrame_SetStackPointer(frame, stack_pointer);
             TRACE_FUNCTION_EXIT();