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gh-76785: Crossinterp utils additions (gh-111530)

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This moves several general internal APIs out of _xxsubinterpretersmodule.c and into the new Python/crossinterp.c (and the corresponding internal headers).

Specifically:

* _Py_excinfo, etc.:  the initial implementation for non-object exception snapshots (in pycore_pyerrors.h and Python/errors.c)
* _PyXI_exception_info, etc.:  helpers for passing an exception beween interpreters (wraps _Py_excinfo)
* _PyXI_namespace, etc.:  helpers for copying a dict of attrs between interpreters
* _PyXI_Enter(), _PyXI_Exit():  functions that abstract out the transitions between one interpreter and a second that will do some work temporarily

Again, these were all abstracted out of _xxsubinterpretersmodule.c as generalizations.  I plan on proposing these as public API at some point.
This commit is contained in:
Eric Snow 2023-11-01 17:36:40 -06:00 • committed by GitHub
parent cde1071b2a
commit 9322ce90ac
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11 changed files with 1309 additions and 472 deletions
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24
Include/internal/pycore_pyerrors.h
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@ -68,6 +68,30 @@ extern PyStatus _PyErr_InitTypes(PyInterpreterState *);
extern void _PyErr_FiniTypes(PyInterpreterState *);
/* exception snapshots */
// Ultimately we'd like to preserve enough information about the
// exception and traceback that we could re-constitute (or at least
// simulate, a la traceback.TracebackException), and even chain, a copy
// of the exception in the calling interpreter.
typedef struct _excinfo {
const char *type;
const char *msg;
} _Py_excinfo;
extern void _Py_excinfo_Clear(_Py_excinfo *info);
extern int _Py_excinfo_Copy(_Py_excinfo *dest, _Py_excinfo *src);
extern const char * _Py_excinfo_InitFromException(
_Py_excinfo *info,
PyObject *exc);
extern void _Py_excinfo_Apply(_Py_excinfo *info, PyObject *exctype);
extern const char * _Py_excinfo_AsUTF8(
_Py_excinfo *info,
char *buf,
size_t bufsize);
/* other API */
static inline PyObject* _PyErr_Occurred(PyThreadState *tstate)