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gh-148171: Convert CALL_BUILTIN_FAST to leave inputs on the stack for refcount elimination in JIT #148172

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gh-148171: Convert CALL_BUILTIN_FAST to leave inputs on the stack for refcount elimination in JIT #148172

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8f9c2ab
Split CALL_BUILTIN_FAST decrefs into POP_NOS
Fidget-Spinner Apr 6, 2026
f6cb053
Simplify
Fidget-Spinner Apr 6, 2026
3dec570
rename to POP_TOP_OPARG
Fidget-Spinner Apr 6, 2026
5f9a7bb
fix sys test
Fidget-Spinner Apr 6, 2026
769cef6
Update Python/bytecodes.c
Fidget-Spinner Apr 6, 2026
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2 changes: 1 addition & 1 deletion Include/internal/pycore_ceval.h
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Original file line number Diff line number Diff line change
Expand Up @@ -433,7 +433,7 @@ _Py_VectorCallInstrumentation_StackRefSteal(
PyThreadState* tstate);

PyAPI_FUNC(PyObject *)
_Py_BuiltinCallFast_StackRefSteal(
_Py_BuiltinCallFast_StackRef(
_PyStackRef callable,
_PyStackRef *arguments,
int total_args);
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3 changes: 2 additions & 1 deletion Include/internal/pycore_magic_number.h
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Original file line number Diff line number Diff line change
Expand Up @@ -294,6 +294,7 @@ Known values:
Python 3.15a4 3661 (Lazy imports IMPORT_NAME opcode changes)
Python 3.15a8 3662 (Add counter to RESUME)
Python 3.15a8 3663 (Merge GET_ITER and GET_YIELD_FROM_ITER. Modify SEND to make it a bit more like FOR_ITER)
Python 3.15b1 3664 (All code objects now have 1 extra stack slot space)


Python 3.16 will start with 3700
Expand All @@ -307,7 +308,7 @@ PC/launcher.c must also be updated.

*/

#define PYC_MAGIC_NUMBER 3663
#define PYC_MAGIC_NUMBER 3664
/* This is equivalent to converting PYC_MAGIC_NUMBER to 2 bytes
(little-endian) and then appending b'\r\n'. */
#define PYC_MAGIC_NUMBER_TOKEN \
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2 changes: 1 addition & 1 deletion Include/internal/pycore_opcode_metadata.h
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12 changes: 12 additions & 0 deletions Include/internal/pycore_stackref.h
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Expand Up @@ -845,6 +845,18 @@ _Py_TryXGetStackRef(PyObject **src, _PyStackRef *out)
} \
} while (0)

static inline void
_PyStackRef_CloseStack(_PyStackRef *arguments, int total_args)
{
// arguments is a pointer into the GC visible stack,
// so we must NULL out values as we clear them.
for (int i = total_args-1; i >= 0; i--) {
_PyStackRef tmp = arguments[i];
arguments[i] = PyStackRef_NULL;
PyStackRef_CLOSE(tmp);
}
}

#ifdef __cplusplus
}
#endif
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