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gh-132775: Add _PyObject_GetXIDataWithFallback() #133482

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gh-132775: Add _PyObject_GetXIDataWithFallback() #133482

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55ccaa0
Add _PyObject_GetXIDataWithFallback().
ericsnowcurrently Apr 25, 2025
d8b73ab
Py_UNREACHABLE() -> Py_FatalError().
ericsnowcurrently May 13, 2025
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25 changes: 23 additions & 2 deletions Include/internal/pycore_crossinterp.h
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Original file line number Diff line number Diff line change
Expand Up @@ -131,7 +131,23 @@ PyAPI_FUNC(void) _PyXIData_Clear(PyInterpreterState *, _PyXIData_t *);

/* getting cross-interpreter data */

typedef int (*xidatafunc)(PyThreadState *tstate, PyObject *, _PyXIData_t *);
typedef int xidata_fallback_t;
#define _PyXIDATA_XIDATA_ONLY (0)
#define _PyXIDATA_FULL_FALLBACK (1)
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Maybe flags like 0b111?


// Technically, we don't need two different function types;
// we could go with just the fallback one. However, only container
// types like tuple need it, so always having the extra arg would be
// a bit unfortunate. It's also nice to be able to clearly distinguish
// between types that might call _PyObject_GetXIData() and those that won't.
//
typedef int (*xidatafunc)(PyThreadState *, PyObject *, _PyXIData_t *);
typedef int (*xidatafbfunc)(
PyThreadState *, PyObject *, xidata_fallback_t, _PyXIData_t *);
typedef struct {
xidatafunc basic;
xidatafbfunc fallback;
} _PyXIData_getdata_t;
Comment on lines +147 to +150
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@neonene neonene May 16, 2025 •
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Does the layout imply that it would accept two functions in the future? If exclusive, is there any reason why it cannot be a void pointer (or xidatafunc) with a flag? (The C compilers could verify xidatafbfunc at REGISTER_FALLBACK().)

E: No change request from me as long as there are only two options.


PyAPI_FUNC(PyObject *) _PyXIData_GetNotShareableErrorType(PyThreadState *);
PyAPI_FUNC(void) _PyXIData_SetNotShareableError(PyThreadState *, const char *);
Expand All @@ -140,7 +156,7 @@ PyAPI_FUNC(void) _PyXIData_FormatNotShareableError(
const char *,
...);

PyAPI_FUNC(xidatafunc) _PyXIData_Lookup(
PyAPI_FUNC(_PyXIData_getdata_t) _PyXIData_Lookup(
PyThreadState *,
PyObject *);
PyAPI_FUNC(int) _PyObject_CheckXIData(
Expand All @@ -151,6 +167,11 @@ PyAPI_FUNC(int) _PyObject_GetXIData(
PyThreadState *,
PyObject *,
_PyXIData_t *);
PyAPI_FUNC(int) _PyObject_GetXIDataWithFallback(
PyThreadState *,
PyObject *,
xidata_fallback_t,
_PyXIData_t *);

// _PyObject_GetXIData() for bytes
typedef struct {
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4 changes: 2 additions & 2 deletions Include/internal/pycore_crossinterp_data_registry.h
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Expand Up @@ -17,7 +17,7 @@ typedef struct _xid_regitem {
/* This is NULL for builtin types. */
PyObject *weakref;
size_t refcount;
xidatafunc getdata;
_PyXIData_getdata_t getdata;
} _PyXIData_regitem_t;

typedef struct {
Expand All @@ -30,7 +30,7 @@ typedef struct {
PyAPI_FUNC(int) _PyXIData_RegisterClass(
PyThreadState *,
PyTypeObject *,
xidatafunc);
_PyXIData_getdata_t);
PyAPI_FUNC(int) _PyXIData_UnregisterClass(
PyThreadState *,
PyTypeObject *);
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