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gh-115999: Specialize CALL_KW in free-threaded builds (#127713)

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* Enable specialization of CALL_KW

* Fix bug pushing frame in _PY_FRAME_KW

`_PY_FRAME_KW` pushes a pointer to the new frame onto the stack for
consumption by the next uop. When pushing the frame fails, we do not
want to push the result, `NULL`, to the stack because it is not
a valid stackref. This works in the default build because `PyStackRef_NULL`
 and `NULL` are the same value, so the `PyStackRef_XCLOSE()` in the error
handler ignores it. In the free-threaded build the values are not the same;
`PyStackRef_XCLOSE()` will attempt to decref a null pointer.
This commit is contained in:
mpage 2024-12-11 15:18:22 -08:00 • committed by GitHub
parent e8f4e272cc
commit c84928ed6d
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4 changed files with 26 additions and 35 deletions
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9
Python/bytecodes.c
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@ -4311,7 +4311,7 @@ dummy_func(
assert(Py_TYPE(callable_o) == &PyFunction_Type);
int code_flags = ((PyCodeObject*)PyFunction_GET_CODE(callable_o))->co_flags;
PyObject *locals = code_flags & CO_OPTIMIZED ? NULL : Py_NewRef(PyFunction_GET_GLOBALS(callable_o));
new_frame = _PyEvalFramePushAndInit(
_PyInterpreterFrame *temp = _PyEvalFramePushAndInit(
tstate, callable[0], locals,
args, positional_args, kwnames_o, frame
);
@ -4319,9 +4319,10 @@ dummy_func(
// The frame has stolen all the arguments from the stack,
// so there is no need to clean them up.
SYNC_SP();
if (new_frame == NULL) {
if (temp == NULL) {
ERROR_NO_POP();
}
new_frame = temp;
}
op(_CHECK_FUNCTION_VERSION_KW, (func_version/2, callable[1], self_or_null[1], unused[oparg], kwnames -- callable[1], self_or_null[1], unused[oparg], kwnames)) {
@ -4372,7 +4373,7 @@ dummy_func(
_PUSH_FRAME;
specializing op(_SPECIALIZE_CALL_KW, (counter/1, callable[1], self_or_null[1], args[oparg], kwnames -- callable[1], self_or_null[1], args[oparg], kwnames)) {
#if ENABLE_SPECIALIZATION
#if ENABLE_SPECIALIZATION_FT
if (ADAPTIVE_COUNTER_TRIGGERS(counter)) {
next_instr = this_instr;
_Py_Specialize_CallKw(callable[0], next_instr, oparg + !PyStackRef_IsNull(self_or_null[0]));
@ -4380,7 +4381,7 @@ dummy_func(
}
OPCODE_DEFERRED_INC(CALL_KW);
ADVANCE_ADAPTIVE_COUNTER(this_instr[1].counter);
#endif /* ENABLE_SPECIALIZATION */
#endif /* ENABLE_SPECIALIZATION_FT */
}
macro(CALL_KW) =