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gh-76785: Minor Cleanup of Exception-related Cross-interpreter State (gh-126602) 

This change makes it easier to backport the _interpreters, _interpqueues, and _interpchannels modules to Python 3.12.
This commit is contained in:
Eric Snow 2024-11-11 14:49:41 -07:00 committed by GitHub
parent 3c6d2d1230
commit b697d8c48e
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
4 changed files with 83 additions and 60 deletions
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10
Include/internal/pycore_crossinterp.h
View File

@ -11,6 +11,7 @@ extern "C" {
#include "pycore_lock.h" // PyMutex
#include "pycore_pyerrors.h"
/**************/
/* exceptions */
/**************/
@ -163,8 +164,13 @@ struct _xi_state {
// heap types
_PyXIData_lookup_t data_lookup;
// heap types
PyObject *PyExc_NotShareableError;
struct xi_exceptions {
// static types
PyObject *PyExc_InterpreterError;
PyObject *PyExc_InterpreterNotFoundError;
// heap types
PyObject *PyExc_NotShareableError;
} exceptions;
};
extern PyStatus _PyXI_Init(PyInterpreterState *interp);

2
Modules/_interpretersmodule.c
View File

@ -1507,7 +1507,7 @@ module_exec(PyObject *mod)
goto error;
}
PyObject *PyExc_NotShareableError = \
_PyInterpreterState_GetXIState(interp)->PyExc_NotShareableError;
_PyInterpreterState_GetXIState(interp)->exceptions.PyExc_NotShareableError;
if (PyModule_AddType(mod, (PyTypeObject *)PyExc_NotShareableError) < 0) {
goto error;
}

36
Python/crossinterp.c
View File

@ -17,11 +17,11 @@
/* exceptions */
/**************/
static int init_exceptions(PyInterpreterState *);
static void fini_exceptions(PyInterpreterState *);
static int _init_not_shareable_error_type(PyInterpreterState *);
static void _fini_not_shareable_error_type(PyInterpreterState *);
static PyObject * _get_not_shareable_error_type(PyInterpreterState *);
typedef struct xi_exceptions exceptions_t;
static int init_static_exctypes(exceptions_t *, PyInterpreterState *);
static void fini_static_exctypes(exceptions_t *, PyInterpreterState *);
static int init_heap_exctypes(exceptions_t *);
static void fini_heap_exctypes(exceptions_t *);
#include "crossinterp_exceptions.h"
@ -205,7 +205,8 @@ static inline void
_set_xid_lookup_failure(PyInterpreterState *interp,
PyObject *obj, const char *msg)
{
PyObject *exctype = _get_not_shareable_error_type(interp);
exceptions_t *state = &_PyInterpreterState_GetXIState(interp)->exceptions;
PyObject *exctype = state->PyExc_NotShareableError;
assert(exctype != NULL);
if (msg != NULL) {
assert(obj == NULL);
@ -1605,7 +1606,9 @@ _propagate_not_shareable_error(_PyXI_session *session)
return;
}
PyInterpreterState *interp = PyInterpreterState_Get();
if (PyErr_ExceptionMatches(_get_not_shareable_error_type(interp))) {
exceptions_t *state = &_PyInterpreterState_GetXIState(interp)->exceptions;
assert(state->PyExc_NotShareableError != NULL);
if (PyErr_ExceptionMatches(state->PyExc_NotShareableError)) {
// We want to propagate the exception directly.
session->_error_override = _PyXI_ERR_NOT_SHAREABLE;
session->error_override = &session->_error_override;
@ -1782,9 +1785,11 @@ _PyXI_Init(PyInterpreterState *interp)
}
xid_lookup_init(&_PyXI_GET_STATE(interp)->data_lookup);
// Initialize exceptions (heap types).
if (_init_not_shareable_error_type(interp) < 0) {
return _PyStatus_ERR("failed to initialize NotShareableError");
// Initialize exceptions.(heap types).
// See _PyXI_InitTypes() for the static types.
if (init_heap_exctypes(&_PyXI_GET_STATE(interp)->exceptions) < 0) {
PyErr_PrintEx(0);
return _PyStatus_ERR("failed to initialize exceptions");
}
return _PyStatus_OK();
@ -1797,7 +1802,8 @@ void
_PyXI_Fini(PyInterpreterState *interp)
{
// Finalize exceptions (heap types).
_fini_not_shareable_error_type(interp);
// See _PyXI_FiniTypes() for the static types.
fini_heap_exctypes(&_PyXI_GET_STATE(interp)->exceptions);
// Finalize the XID lookup state (e.g. registry).
xid_lookup_fini(&_PyXI_GET_STATE(interp)->data_lookup);
@ -1809,17 +1815,21 @@ _PyXI_Fini(PyInterpreterState *interp)
PyStatus
_PyXI_InitTypes(PyInterpreterState *interp)
{
if (init_exceptions(interp) < 0) {
if (init_static_exctypes(&_PyXI_GET_STATE(interp)->exceptions, interp) < 0) {
PyErr_PrintEx(0);
return _PyStatus_ERR("failed to initialize an exception type");
}
// We would initialize heap types here too but that leads to ref leaks.
// Instead, we intialize them in _PyXI_Init().
return _PyStatus_OK();
}
void
_PyXI_FiniTypes(PyInterpreterState *interp)
{
fini_exceptions(interp);
// We would finalize heap types here too but that leads to ref leaks.
// Instead, we finalize them in _PyXI_Fini().
fini_static_exctypes(&_PyXI_GET_STATE(interp)->exceptions, interp);
}

95
Python/crossinterp_exceptions.h
View File

@ -25,71 +25,78 @@ static PyTypeObject _PyExc_InterpreterNotFoundError = {
};
PyObject *PyExc_InterpreterNotFoundError = (PyObject *)&_PyExc_InterpreterNotFoundError;
/* NotShareableError extends ValueError */
static int
_init_not_shareable_error_type(PyInterpreterState *interp)
{
const char *name = "interpreters.NotShareableError";
PyObject *base = PyExc_ValueError;
PyObject *ns = NULL;
PyObject *exctype = PyErr_NewException(name, base, ns);
if (exctype == NULL) {
return -1;
}
_PyInterpreterState_GetXIState(interp)->PyExc_NotShareableError = exctype;
return 0;
}
static void
_fini_not_shareable_error_type(PyInterpreterState *interp)
{
Py_CLEAR(_PyInterpreterState_GetXIState(interp)->PyExc_NotShareableError);
}
static PyObject *
_get_not_shareable_error_type(PyInterpreterState *interp)
{
assert(_PyInterpreterState_GetXIState(interp)->PyExc_NotShareableError != NULL);
return _PyInterpreterState_GetXIState(interp)->PyExc_NotShareableError;
}
/* lifecycle */
static int
init_exceptions(PyInterpreterState *interp)
init_static_exctypes(exceptions_t *state, PyInterpreterState *interp)
{
assert(state == &_PyXI_GET_STATE(interp)->exceptions);
PyTypeObject *base = (PyTypeObject *)PyExc_Exception;
// builtin static types
// PyExc_InterpreterError
_PyExc_InterpreterError.tp_base = base;
_PyExc_InterpreterError.tp_traverse = base->tp_traverse;
_PyExc_InterpreterError.tp_clear = base->tp_clear;
if (_PyStaticType_InitBuiltin(interp, &_PyExc_InterpreterError) < 0) {
return -1;
goto error;
}
state->PyExc_InterpreterError = (PyObject *)&_PyExc_InterpreterError;
// PyExc_InterpreterNotFoundError
_PyExc_InterpreterNotFoundError.tp_traverse = base->tp_traverse;
_PyExc_InterpreterNotFoundError.tp_clear = base->tp_clear;
if (_PyStaticType_InitBuiltin(interp, &_PyExc_InterpreterNotFoundError) < 0) {
return -1;
goto error;
}
// heap types
// We would call _init_not_shareable_error_type() here too,
// but that leads to ref leaks
state->PyExc_InterpreterNotFoundError =
(PyObject *)&_PyExc_InterpreterNotFoundError;
return 0;
error:
fini_static_exctypes(state, interp);
return -1;
}
static void
fini_exceptions(PyInterpreterState *interp)
fini_static_exctypes(exceptions_t *state, PyInterpreterState *interp)
{
// Likewise with _fini_not_shareable_error_type().
_PyStaticType_FiniBuiltin(interp, &_PyExc_InterpreterNotFoundError);
_PyStaticType_FiniBuiltin(interp, &_PyExc_InterpreterError);
assert(state == &_PyXI_GET_STATE(interp)->exceptions);
if (state->PyExc_InterpreterNotFoundError != NULL) {
state->PyExc_InterpreterNotFoundError = NULL;
_PyStaticType_FiniBuiltin(interp, &_PyExc_InterpreterNotFoundError);
}
if (state->PyExc_InterpreterError != NULL) {
state->PyExc_InterpreterError = NULL;
_PyStaticType_FiniBuiltin(interp, &_PyExc_InterpreterError);
}
}
static int
init_heap_exctypes(exceptions_t *state)
{
PyObject *exctype;
/* NotShareableError extends ValueError */
const char *name = "interpreters.NotShareableError";
PyObject *base = PyExc_ValueError;
PyObject *ns = NULL;
exctype = PyErr_NewException(name, base, ns);
if (exctype == NULL) {
goto error;
}
state->PyExc_NotShareableError = exctype;
return 0;
error:
fini_heap_exctypes(state);
return -1;
}
static void
fini_heap_exctypes(exceptions_t *state)
{
Py_CLEAR(state->PyExc_NotShareableError);
}