gh-111354: remove comparisons with enum values, variable reuse, unused imports in genobject.c (#111708)

Include/internal/pycore_frame.h

@@ -45,6 +45,7 @@ typedef enum _framestate {
 } PyFrameState;
 
 #define FRAME_STATE_SUSPENDED(S) ((S) == FRAME_SUSPENDED || (S) == FRAME_SUSPENDED_YIELD_FROM)
+#define FRAME_STATE_FINISHED(S) ((S) >= FRAME_COMPLETED)
 
 enum _frameowner {
     FRAME_OWNED_BY_THREAD = 0,

Objects/genobject.c

@@ -9,13 +9,10 @@
 #include "pycore_genobject.h"     // struct _Py_async_gen_state
 #include "pycore_modsupport.h"    // _PyArg_CheckPositional()
 #include "pycore_object.h"        // _PyObject_GC_UNTRACK()
-#include "pycore_opcode_metadata.h" // _PyOpcode_Caches
 #include "pycore_opcode_utils.h"  // RESUME_AFTER_YIELD_FROM
 #include "pycore_pyerrors.h"      // _PyErr_ClearExcState()
 #include "pycore_pystate.h"       // _PyThreadState_GET()
 
-#include "opcode.h"               // SEND
-#include "frameobject.h"          // _PyInterpreterFrame_GetLine
 #include "pystats.h"
 
 static PyObject *gen_close(PyGenObject *, PyObject *);
@@ -43,19 +40,12 @@ PyGen_GetCode(PyGenObject *gen) {
     return res;
 }
 
-static inline int
-exc_state_traverse(_PyErr_StackItem *exc_state, visitproc visit, void *arg)
-{
-    Py_VISIT(exc_state->exc_value);
-    return 0;
-}
-
 static int
 gen_traverse(PyGenObject *gen, visitproc visit, void *arg)
 {
     Py_VISIT(gen->gi_name);
     Py_VISIT(gen->gi_qualname);
-    if (gen->gi_frame_state < FRAME_CLEARED) {
+    if (gen->gi_frame_state != FRAME_CLEARED) {
         _PyInterpreterFrame *frame = (_PyInterpreterFrame *)(gen->gi_iframe);
         assert(frame->frame_obj == NULL ||
                frame->frame_obj->f_frame->owner == FRAME_OWNED_BY_GENERATOR);
@@ -66,7 +56,8 @@ gen_traverse(PyGenObject *gen, visitproc visit, void *arg)
     }
     /* No need to visit cr_origin, because it's just tuples/str/int, so can't
        participate in a reference cycle. */
-    return exc_state_traverse(&gen->gi_exc_state, visit, arg);
+    Py_VISIT(gen->gi_exc_state.exc_value);
+    return 0;
 }
 
 void
@@ -74,7 +65,7 @@ _PyGen_Finalize(PyObject *self)
 {
     PyGenObject *gen = (PyGenObject *)self;
 
-    if (gen->gi_frame_state >= FRAME_COMPLETED) {
+    if (FRAME_STATE_FINISHED(gen->gi_frame_state)) {
         /* Generator isn't paused, so no need to close */
         return;
     }
@@ -147,7 +138,7 @@ gen_dealloc(PyGenObject *gen)
            and GC_Del. */
         Py_CLEAR(((PyAsyncGenObject*)gen)->ag_origin_or_finalizer);
     }
-    if (gen->gi_frame_state < FRAME_CLEARED) {
+    if (gen->gi_frame_state != FRAME_CLEARED) {
         _PyInterpreterFrame *frame = (_PyInterpreterFrame *)gen->gi_iframe;
         gen->gi_frame_state = FRAME_CLEARED;
         frame->previous = NULL;
@@ -171,7 +162,6 @@ gen_send_ex2(PyGenObject *gen, PyObject *arg, PyObject **presult,
 {
     PyThreadState *tstate = _PyThreadState_GET();
     _PyInterpreterFrame *frame = (_PyInterpreterFrame *)gen->gi_iframe;
-    PyObject *result;
 
     *presult = NULL;
     if (gen->gi_frame_state == FRAME_CREATED && arg && arg != Py_None) {
@@ -198,7 +188,7 @@ gen_send_ex2(PyGenObject *gen, PyObject *arg, PyObject **presult,
         PyErr_SetString(PyExc_ValueError, msg);
         return PYGEN_ERROR;
     }
-    if (gen->gi_frame_state >= FRAME_COMPLETED) {
+    if (FRAME_STATE_FINISHED(gen->gi_frame_state)) {
         if (PyCoro_CheckExact(gen) && !closing) {
             /* `gen` is an exhausted coroutine: raise an error,
                except when called from gen_close(), which should
@@ -216,10 +206,12 @@ gen_send_ex2(PyGenObject *gen, PyObject *arg, PyObject **presult,
         return PYGEN_ERROR;
     }
 
-    assert(gen->gi_frame_state < FRAME_EXECUTING);
+    assert((gen->gi_frame_state == FRAME_CREATED) ||
+           FRAME_STATE_SUSPENDED(gen->gi_frame_state));
+
     /* Push arg onto the frame's value stack */
-    result = arg ? arg : Py_None;
+    PyObject *arg_obj = arg ? arg : Py_None;
-    _PyFrame_StackPush(frame, Py_NewRef(result));
+    _PyFrame_StackPush(frame, Py_NewRef(arg_obj));
 
     _PyErr_StackItem *prev_exc_info = tstate->exc_info;
     gen->gi_exc_state.previous_item = prev_exc_info;
@@ -232,7 +224,7 @@ gen_send_ex2(PyGenObject *gen, PyObject *arg, PyObject **presult,
 
     gen->gi_frame_state = FRAME_EXECUTING;
     EVAL_CALL_STAT_INC(EVAL_CALL_GENERATOR);
-    result = _PyEval_EvalFrame(tstate, frame, exc);
+    PyObject *result = _PyEval_EvalFrame(tstate, frame, exc);
     assert(tstate->exc_info == prev_exc_info);
     assert(gen->gi_exc_state.previous_item == NULL);
     assert(gen->gi_frame_state != FRAME_EXECUTING);
@@ -366,7 +358,7 @@ gen_close(PyGenObject *gen, PyObject *args)
         gen->gi_frame_state = FRAME_COMPLETED;
         Py_RETURN_NONE;
     }
-    if (gen->gi_frame_state >= FRAME_COMPLETED) {
+    if (FRAME_STATE_FINISHED(gen->gi_frame_state)) {
         Py_RETURN_NONE;
     }
     PyObject *yf = _PyGen_yf(gen);
@@ -2095,7 +2087,7 @@ async_gen_athrow_send(PyAsyncGenAThrow *o, PyObject *arg)
         return NULL;
     }
 
-    if (gen->gi_frame_state >= FRAME_COMPLETED) {
+    if (FRAME_STATE_FINISHED(gen->gi_frame_state)) {
         o->agt_state = AWAITABLE_STATE_CLOSED;
         PyErr_SetNone(PyExc_StopIteration);
         return NULL;