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GH-108866: Guarantee forward progress in executors. (GH-113006)

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Mark Shannon 2023-12-12 19:02:24 +00:00 • committed by GitHub
parent 9898e61041
commit 956023826a
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7 changed files with 19 additions and 21 deletions
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8
Python/optimizer.c
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@ -167,6 +167,7 @@ _PyOptimizer_BackEdge(_PyInterpreterFrame *frame, _Py_CODEUNIT *src, _Py_CODEUNI
}
_PyOptimizerObject *opt = interp->optimizer;
_PyExecutorObject *executor = NULL;
/* Start optimizing at the destination to guarantee forward progress */
int err = opt->optimize(opt, code, dest, &executor, (int)(stack_pointer - _PyFrame_Stackbase(frame)));
if (err <= 0) {
assert(executor == NULL);
@ -247,14 +248,13 @@ PyTypeObject _PyCounterExecutor_Type = {
.tp_methods = executor_methods,
};
static _PyInterpreterFrame *
static _Py_CODEUNIT *
counter_execute(_PyExecutorObject *self, _PyInterpreterFrame *frame, PyObject **stack_pointer)
{
((_PyCounterExecutorObject *)self)->optimizer->count++;
_PyFrame_SetStackPointer(frame, stack_pointer);
frame->instr_ptr = ((_PyCounterExecutorObject *)self)->next_instr;
Py_DECREF(self);
return frame;
return ((_PyCounterExecutorObject *)self)->next_instr;
}
static int
@ -891,7 +891,7 @@ uop_optimize(
/* Dummy execute() function for UOp Executor.
* The actual implementation is inlined in ceval.c,
* in _PyEval_EvalFrameDefault(). */
_PyInterpreterFrame *
_Py_CODEUNIT *
_PyUOpExecute(_PyExecutorObject *executor, _PyInterpreterFrame *frame, PyObject **stack_pointer)
{
Py_FatalError("Tier 2 is now inlined into Tier 1");