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GeezerVison is showing github.com — cpython/Python/crossinterp.c at main · python/cpython Expand file tree/ Copy pathcrossinterp.cMore file actions 3363 lines (3010 loc) · 91.6 KB / Copy pathcrossinterp.cFile metadata and controls3363 lines (3010 loc) · 91.6 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 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962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 /* API for managing interactions between isolated interpreters */ #include "Python.h" #include "marshal.h" // PyMarshal_WriteObjectToString() #include "osdefs.h" // MAXPATHLEN #include "pycore_ceval.h" // _Py_simple_func #include "pycore_crossinterp.h" // _PyXIData_t #include "pycore_function.h" // _PyFunction_VerifyStateless() #include "pycore_global_strings.h" // _Py_ID() #include "pycore_import.h" // _PyImport_SetModule() #include "pycore_initconfig.h" // _PyStatus_OK() #include "pycore_namespace.h" // _PyNamespace_New() #include "pycore_pythonrun.h" // _Py_SourceAsString() #include "pycore_runtime.h" // _PyRuntime #include "pycore_setobject.h" // _PySet_NextEntry() #include "pycore_typeobject.h" // _PyStaticType_InitBuiltin() static Py_ssize_t _Py_GetMainfile(char *buffer, size_t maxlen) { // We don't expect subinterpreters to have the __main__ module's // __name__ set, but proceed just in case. PyThreadState *tstate = _PyThreadState_GET(); PyObject *module = _Py_GetMainModule(tstate); if (_Py_CheckMainModule(module) < 0) { Py_XDECREF(module); return -1; } Py_ssize_t size = _PyModule_GetFilenameUTF8(module, buffer, maxlen); Py_DECREF(module); return size; } static PyObject * runpy_run_path(const char *filename, const char *modname) { PyObject *run_path = PyImport_ImportModuleAttrString("runpy", "run_path"); if (run_path == NULL) { return NULL; } PyObject *args = Py_BuildValue("(sOs)", filename, Py_None, modname); if (args == NULL) { Py_DECREF(run_path); return NULL; } PyObject *ns = PyObject_Call(run_path, args, NULL); Py_DECREF(run_path); Py_DECREF(args); return ns; } static void set_exc_with_cause(PyObject *exctype, const char *msg) { PyObject *cause = PyErr_GetRaisedException(); PyErr_SetString(exctype, msg); PyObject *exc = PyErr_GetRaisedException(); PyException_SetCause(exc, cause); PyErr_SetRaisedException(exc); } /****************************/ /* module duplication utils */ /****************************/ struct sync_module_result { PyObject *module; PyObject *loaded; PyObject *failed; }; struct sync_module { const char *filename; char _filename[MAXPATHLEN+1]; struct sync_module_result cached; }; static void sync_module_clear(struct sync_module *data) { data->filename = NULL; Py_CLEAR(data->cached.module); Py_CLEAR(data->cached.loaded); Py_CLEAR(data->cached.failed); } static void sync_module_capture_exc(PyThreadState *tstate, struct sync_module *data) { assert(_PyErr_Occurred(tstate)); PyObject *context = data->cached.failed; PyObject *exc = _PyErr_GetRaisedException(tstate); _PyErr_SetRaisedException(tstate, Py_NewRef(exc)); if (context != NULL) { PyException_SetContext(exc, context); } data->cached.failed = exc; } static int ensure_isolated_main(PyThreadState *tstate, struct sync_module *main) { // Load the module from the original file (or from a cache). // First try the local cache. if (main->cached.failed != NULL) { // We'll deal with this in apply_isolated_main(). assert(main->cached.module == NULL); assert(main->cached.loaded == NULL); return 0; } else if (main->cached.loaded != NULL) { assert(main->cached.module != NULL); return 0; } assert(main->cached.module == NULL); if (main->filename == NULL) { _PyErr_SetString(tstate, PyExc_NotImplementedError, ""); return -1; } // It wasn't in the local cache so we'll need to populate it. PyObject *mod = _Py_GetMainModule(tstate); if (_Py_CheckMainModule(mod) < 0) { // This is probably unrecoverable, so don't bother caching the error. assert(_PyErr_Occurred(tstate)); Py_XDECREF(mod); return -1; } PyObject *loaded = NULL; // Try the per-interpreter cache for the loaded module. // XXX Store it in sys.modules? PyObject *interpns = PyInterpreterState_GetDict(tstate->interp); assert(interpns != NULL); PyObject *key = PyUnicode_FromString("CACHED_MODULE_NS___main__"); if (key == NULL) { // It's probably unrecoverable, so don't bother caching the error. Py_DECREF(mod); return -1; } else if (PyDict_GetItemRef(interpns, key, &loaded) < 0) { // It's probably unrecoverable, so don't bother caching the error. Py_DECREF(mod); Py_DECREF(key); return -1; } else if (loaded == NULL) { // It wasn't already loaded from file. loaded = PyModule_NewObject(&_Py_ID(__main__)); if (loaded == NULL) { goto error; } PyObject *ns = _PyModule_GetDict(loaded); // We don't want to trigger "if __name__ == '__main__':", // so we use a bogus module name. PyObject *loaded_ns = runpy_run_path(main->filename, "<fake __main__>"); if (loaded_ns == NULL) { goto error; } int res = PyDict_Update(ns, loaded_ns); Py_DECREF(loaded_ns); if (res < 0) { goto error; } // Set the per-interpreter cache entry. if (PyDict_SetItem(interpns, key, loaded) < 0) { goto error; } } Py_DECREF(key); main->cached = (struct sync_module_result){ .module = mod, .loaded = loaded, }; return 0; error: sync_module_capture_exc(tstate, main); Py_XDECREF(loaded); Py_DECREF(mod); Py_XDECREF(key); return -1; } #ifndef NDEBUG static int main_mod_matches(PyObject *expected) { PyObject *mod = PyImport_GetModule(&_Py_ID(__main__)); Py_XDECREF(mod); return mod == expected; } #endif static int apply_isolated_main(PyThreadState *tstate, struct sync_module *main) { assert((main->cached.loaded == NULL) == (main->cached.loaded == NULL)); if (main->cached.failed != NULL) { // It must have failed previously. assert(main->cached.loaded == NULL); _PyErr_SetRaisedException(tstate, main->cached.failed); return -1; } assert(main->cached.loaded != NULL); assert(main_mod_matches(main->cached.module)); if (_PyImport_SetModule(&_Py_ID(__main__), main->cached.loaded) < 0) { sync_module_capture_exc(tstate, main); return -1; } return 0; } static void restore_main(PyThreadState *tstate, struct sync_module *main) { assert(main->cached.failed == NULL); assert(main->cached.module != NULL); assert(main->cached.loaded != NULL); PyObject *exc = _PyErr_GetRaisedException(tstate); assert(main_mod_matches(main->cached.loaded)); int res = _PyImport_SetModule(&_Py_ID(__main__), main->cached.module); assert(res == 0); if (res < 0) { PyErr_FormatUnraisable("Exception ignored while restoring __main__"); } _PyErr_SetRaisedException(tstate, exc); } /**************/ /* exceptions */ /**************/ 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" /***************************/ /* cross-interpreter calls */ /***************************/ int _Py_CallInInterpreter(PyInterpreterState *interp, _Py_simple_func func, void *arg) { if (interp == PyInterpreterState_Get()) { return func(arg); } // XXX Emit a warning if this fails? _PyEval_AddPendingCall(interp, (_Py_pending_call_func)func, arg, 0); return 0; } int _Py_CallInInterpreterAndRawFree(PyInterpreterState *interp, _Py_simple_func func, void *arg) { if (interp == PyInterpreterState_Get()) { int res = func(arg); PyMem_RawFree(arg); return res; } // XXX Emit a warning if this fails? _PyEval_AddPendingCall(interp, func, arg, _Py_PENDING_RAWFREE); return 0; } /**************************/ /* cross-interpreter data */ /**************************/ /* registry of {type -> _PyXIData_getdata_t} */ /* For now we use a global registry of shareable classes. An alternative would be to add a tp_* slot for a class's _PyXIData_getdata_t. It would be simpler and more efficient. */ static void xid_lookup_init(_PyXIData_lookup_t *); static void xid_lookup_fini(_PyXIData_lookup_t *); struct _dlcontext; static _PyXIData_getdata_t lookup_getdata(struct _dlcontext *, PyObject *); #include "crossinterp_data_lookup.h" /* lifecycle */ _PyXIData_t * _PyXIData_New(void) { _PyXIData_t *xid = PyMem_RawCalloc(1, sizeof(_PyXIData_t)); if (xid == NULL) { PyErr_NoMemory(); } return xid; } void _PyXIData_Free(_PyXIData_t *xid) { PyInterpreterState *interp = PyInterpreterState_Get(); _PyXIData_Clear(interp, xid); PyMem_RawFree(xid); } /* defining cross-interpreter data */ static inline void _xidata_init(_PyXIData_t *xidata) { // If the value is being reused // then _xidata_clear() should have been called already. assert(xidata->data == NULL); assert(xidata->obj == NULL); *xidata = (_PyXIData_t){0}; _PyXIData_INTERPID(xidata) = -1; } static inline void _xidata_clear(_PyXIData_t *xidata) { // _PyXIData_t only has two members that need to be // cleaned up, if set: "xidata" must be freed and "obj" must be decref'ed. // In both cases the original (owning) interpreter must be used, // which is the caller's responsibility to ensure. if (xidata->data != NULL) { if (xidata->free != NULL) { xidata->free(xidata->data); } xidata->data = NULL; } Py_CLEAR(xidata->obj); } void _PyXIData_Init(_PyXIData_t *xidata, PyInterpreterState *interp, void *shared, PyObject *obj, xid_newobjfunc new_object) { assert(xidata != NULL); assert(new_object != NULL); _xidata_init(xidata); xidata->data = shared; if (obj != NULL) { assert(interp != NULL); // released in _PyXIData_Clear() xidata->obj = Py_NewRef(obj); } // Ideally every object would know its owning interpreter. // Until then, we have to rely on the caller to identify it // (but we don't need it in all cases). _PyXIData_INTERPID(xidata) = (interp != NULL) ? PyInterpreterState_GetID(interp) : -1; xidata->new_object = new_object; } int _PyXIData_InitWithSize(_PyXIData_t *xidata, PyInterpreterState *interp, const size_t size, PyObject *obj, xid_newobjfunc new_object) { assert(size > 0); // For now we always free the shared data in the same interpreter // where it was allocated, so the interpreter is required. assert(interp != NULL); _PyXIData_Init(xidata, interp, NULL, obj, new_object); xidata->data = PyMem_RawCalloc(1, size); if (xidata->data == NULL) { Py_CLEAR(xidata->obj); PyErr_NoMemory(); return -1; } xidata->free = PyMem_RawFree; return 0; } void _PyXIData_Clear(PyInterpreterState *interp, _PyXIData_t *xidata) { assert(xidata != NULL); // This must be called in the owning interpreter. assert(interp == NULL || _PyXIData_INTERPID(xidata) == -1 || _PyXIData_INTERPID(xidata) == PyInterpreterState_GetID(interp)); _xidata_clear(xidata); } /* getting cross-interpreter data */ static inline void _set_xid_lookup_failure(PyThreadState *tstate, PyObject *obj, const char *msg, PyObject *cause) { if (msg != NULL) { assert(obj == NULL); set_notshareableerror(tstate, cause, 0, msg); } else if (obj == NULL) { msg = "object does not support cross-interpreter data"; set_notshareableerror(tstate, cause, 0, msg); } else { msg = "%R does not support cross-interpreter data"; format_notshareableerror(tstate, cause, 0, msg, obj); } } int _PyObject_CheckXIData(PyThreadState *tstate, PyObject *obj) { dlcontext_t ctx; if (get_lookup_context(tstate, &ctx) < 0) { return -1; } _PyXIData_getdata_t getdata = lookup_getdata(&ctx, obj); if (getdata.basic == NULL && getdata.fallback == NULL) { if (!_PyErr_Occurred(tstate)) { _set_xid_lookup_failure(tstate, obj, NULL, NULL); } return -1; } return 0; } static int _check_xidata(PyThreadState *tstate, _PyXIData_t *xidata) { // xidata->data can be anything, including NULL, so we don't check it. // xidata->obj may be NULL, so we don't check it. if (_PyXIData_INTERPID(xidata) < 0) { PyErr_SetString(PyExc_SystemError, "missing interp"); return -1; } if (xidata->new_object == NULL) { PyErr_SetString(PyExc_SystemError, "missing new_object func"); return -1; } // xidata->free may be NULL, so we don't check it. return 0; } static int _get_xidata(PyThreadState *tstate, PyObject *obj, xidata_fallback_t fallback, _PyXIData_t *xidata) { PyInterpreterState *interp = tstate->interp; assert(xidata->data == NULL); assert(xidata->obj == NULL); if (xidata->data != NULL || xidata->obj != NULL) { _PyErr_SetString(tstate, PyExc_ValueError, "xidata not cleared"); return -1; } // Call the "getdata" func for the object. dlcontext_t ctx; if (get_lookup_context(tstate, &ctx) < 0) { return -1; } Py_INCREF(obj); _PyXIData_getdata_t getdata = lookup_getdata(&ctx, obj); if (getdata.basic == NULL && getdata.fallback == NULL) { if (PyErr_Occurred()) { Py_DECREF(obj); return -1; } // Fall back to obj Py_DECREF(obj); if (!_PyErr_Occurred(tstate)) { _set_xid_lookup_failure(tstate, obj, NULL, NULL); } return -1; } int res = getdata.basic != NULL ? getdata.basic(tstate, obj, xidata) : getdata.fallback(tstate, obj, fallback, xidata); Py_DECREF(obj); if (res != 0) { PyObject *cause = _PyErr_GetRaisedException(tstate); assert(cause != NULL); _set_xid_lookup_failure(tstate, obj, NULL, cause); Py_XDECREF(cause); return -1; } // Fill in the blanks and validate the result. _PyXIData_INTERPID(xidata) = PyInterpreterState_GetID(interp); if (_check_xidata(tstate, xidata) != 0) { (void)_PyXIData_Release(xidata); return -1; } return 0; } int _PyObject_GetXIDataNoFallback(PyThreadState *tstate, PyObject *obj, _PyXIData_t *xidata) { return _get_xidata(tstate, obj, _PyXIDATA_XIDATA_ONLY, xidata); } int _PyObject_GetXIData(PyThreadState *tstate, PyObject *obj, xidata_fallback_t fallback, _PyXIData_t *xidata) { switch (fallback) { case _PyXIDATA_XIDATA_ONLY: return _get_xidata(tstate, obj, fallback, xidata); case _PyXIDATA_FULL_FALLBACK: if (_get_xidata(tstate, obj, fallback, xidata) == 0) { return 0; } PyObject *exc = _PyErr_GetRaisedException(tstate); if (PyFunction_Check(obj)) { if (_PyFunction_GetXIData(tstate, obj, xidata) == 0) { Py_DECREF(exc); return 0; } _PyErr_Clear(tstate); } // We could try _PyMarshal_GetXIData() but we won't for now. if (_PyPickle_GetXIData(tstate, obj, xidata) == 0) { Py_DECREF(exc); return 0; } // Raise the original exception. _PyErr_SetRaisedException(tstate, exc); return -1; default: #ifdef Py_DEBUG Py_FatalError("unsupported xidata fallback option"); #endif _PyErr_SetString(tstate, PyExc_SystemError, "unsupported xidata fallback option"); return -1; } } /* pickle C-API */ /* Per-interpreter cache for pickle.dumps and pickle.loads. * * Each interpreter has its own cache in _PyXI_state_t.pickle, preserving * interpreter isolation. The cache is populated lazily on first use and * cleared during interpreter finalization in _Py_xi_state_fini(). * * Note: the cached references are captured at first use and not invalidated * on module reload. This matches the caching pattern used elsewhere in * CPython (e.g. arraymodule.c, _decimal.c). */ static PyObject * _get_pickle_dumps(PyThreadState *tstate) { _PyXI_state_t *state = _PyXI_GET_STATE(tstate->interp); PyObject *dumps = state->pickle.dumps; if (dumps != NULL) { return dumps; } dumps = PyImport_ImportModuleAttrString("pickle", "dumps"); if (dumps == NULL) { return NULL; } state->pickle.dumps = dumps; // owns the reference return dumps; } static PyObject * _get_pickle_loads(PyThreadState *tstate) { _PyXI_state_t *state = _PyXI_GET_STATE(tstate->interp); PyObject *loads = state->pickle.loads; if (loads != NULL) { return loads; } loads = PyImport_ImportModuleAttrString("pickle", "loads"); if (loads == NULL) { return NULL; } state->pickle.loads = loads; // owns the reference return loads; } struct _pickle_context { PyThreadState *tstate; }; static PyObject * _PyPickle_Dumps(struct _pickle_context *ctx, PyObject *obj) { PyObject *dumps = _get_pickle_dumps(ctx->tstate); if (dumps == NULL) { return NULL; } // dumps is a borrowed reference from the cache. return PyObject_CallOneArg(dumps, obj); } struct _unpickle_context { PyThreadState *tstate; // We only special-case the __main__ module, // since other modules behave consistently. struct sync_module main; }; static void _unpickle_context_clear(struct _unpickle_context *ctx) { sync_module_clear(&ctx->main); } static int check_missing___main___attr(PyObject *exc) { assert(!PyErr_Occurred()); if (!PyErr_GivenExceptionMatches(exc, PyExc_AttributeError)) { return 0; } // Get the error message. PyObject *args = PyException_GetArgs(exc); if (args == NULL || args == Py_None || PyObject_Size(args) < 1) { Py_XDECREF(args); assert(!PyErr_Occurred()); return 0; } PyObject *msgobj = args; if (!PyUnicode_Check(msgobj)) { msgobj = PySequence_GetItem(args, 0); Py_DECREF(args); if (msgobj == NULL) { PyErr_Clear(); return 0; } } const char *err = PyUnicode_AsUTF8(msgobj); if (err == NULL) { PyErr_Clear(); Py_DECREF(msgobj); return 0; } // Check if it's a missing __main__ attr. int cmp = strncmp(err, "module '__main__' has no attribute '", 36); Py_DECREF(msgobj); return cmp == 0; } static PyObject * _PyPickle_Loads(struct _unpickle_context *ctx, PyObject *pickled) { PyThreadState *tstate = ctx->tstate; PyObject *exc = NULL; // loads is a borrowed reference from the per-interpreter cache. PyObject *loads = _get_pickle_loads(tstate); if (loads == NULL) { return NULL; } // Make an initial attempt to unpickle. PyObject *obj = PyObject_CallOneArg(loads, pickled); if (obj != NULL) { goto finally; } assert(_PyErr_Occurred(tstate)); if (ctx == NULL) { goto finally; } exc = _PyErr_GetRaisedException(tstate); if (!check_missing___main___attr(exc)) { goto finally; } // Temporarily swap in a fake __main__ loaded from the original // file and cached. Note that functions will use the cached ns // for __globals__, // not the actual module. if (ensure_isolated_main(tstate, &ctx->main) < 0) { goto finally; } if (apply_isolated_main(tstate, &ctx->main) < 0) { goto finally; } // Try to unpickle once more. obj = PyObject_CallOneArg(loads, pickled); restore_main(tstate, &ctx->main); if (obj == NULL) { goto finally; } Py_CLEAR(exc); finally: if (exc != NULL) { if (_PyErr_Occurred(tstate)) { sync_module_capture_exc(tstate, &ctx->main); } // We restore the original exception. // It might make sense to chain it (__context__). _PyErr_SetRaisedException(tstate, exc); } return obj; } /* pickle wrapper */ struct _pickle_xid_context { // __main__.__file__ struct { const char *utf8; size_t len; char _utf8[MAXPATHLEN+1]; } mainfile; }; static int _set_pickle_xid_context(PyThreadState *tstate, struct _pickle_xid_context *ctx) { // Set mainfile if possible. Py_ssize_t len = _Py_GetMainfile(ctx->mainfile._utf8, MAXPATHLEN); if (len < 0) { // For now we ignore any exceptions. PyErr_Clear(); } else if (len > 0) { ctx->mainfile.utf8 = ctx->mainfile._utf8; ctx->mainfile.len = (size_t)len; } return 0; } struct _shared_pickle_data { _PyBytes_data_t pickled; // Must be first if we use _PyBytes_FromXIData(). struct _pickle_xid_context ctx; }; PyObject * _PyPickle_LoadFromXIData(_PyXIData_t *xidata) { PyThreadState *tstate = _PyThreadState_GET(); struct _shared_pickle_data *shared = (struct _shared_pickle_data *)xidata->data; // We avoid copying the pickled data by wrapping it in a memoryview. // The alternative is to get a bytes object using _PyBytes_FromXIData(). PyObject *pickled = PyMemoryView_FromMemory( (char *)shared->pickled.bytes, shared->pickled.len, PyBUF_READ); if (pickled == NULL) { return NULL; } // Unpickle the object. struct _unpickle_context ctx = { .tstate = tstate, .main = { .filename = shared->ctx.mainfile.utf8, }, }; PyObject *obj = _PyPickle_Loads(&ctx, pickled); Py_DECREF(pickled); _unpickle_context_clear(&ctx); if (obj == NULL) { PyObject *cause = _PyErr_GetRaisedException(tstate); assert(cause != NULL); _set_xid_lookup_failure( tstate, NULL, "object could not be unpickled", cause); Py_DECREF(cause); } return obj; } int _PyPickle_GetXIData(PyThreadState *tstate, PyObject *obj, _PyXIData_t *xidata) { // Pickle the object. struct _pickle_context ctx = { .tstate = tstate, }; PyObject *bytes = _PyPickle_Dumps(&ctx, obj); if (bytes == NULL) { PyObject *cause = _PyErr_GetRaisedException(tstate); assert(cause != NULL); _set_xid_lookup_failure( tstate, NULL, "object could not be pickled", cause); Py_DECREF(cause); return -1; } // If we had an "unwrapper" mechnanism, we could call // _PyObject_GetXIData() on the bytes object directly and add // a simple unwrapper to call pickle.loads() on the bytes. size_t size = sizeof(struct _shared_pickle_data); struct _shared_pickle_data *shared = (struct _shared_pickle_data *)_PyBytes_GetXIDataWrapped( tstate, bytes, size, _PyPickle_LoadFromXIData, xidata); Py_DECREF(bytes); if (shared == NULL) { return -1; } // If it mattered, we could skip getting __main__.__file__ // when "__main__" doesn't show up in the pickle bytes. if (_set_pickle_xid_context(tstate, &shared->ctx) < 0) { _xidata_clear(xidata); return -1; } return 0; } /* marshal wrapper */ PyObject * _PyMarshal_ReadObjectFromXIData(_PyXIData_t *xidata) { PyThreadState *tstate = _PyThreadState_GET(); _PyBytes_data_t *shared = (_PyBytes_data_t *)xidata->data; PyObject *obj = PyMarshal_ReadObjectFromString(shared->bytes, shared->len); if (obj == NULL) { PyObject *cause = _PyErr_GetRaisedException(tstate); assert(cause != NULL); _set_xid_lookup_failure( tstate, NULL, "object could not be unmarshalled", cause); Py_DECREF(cause); return NULL; } return obj; } int _PyMarshal_GetXIData(PyThreadState *tstate, PyObject *obj, _PyXIData_t *xidata) { PyObject *bytes = PyMarshal_WriteObjectToString(obj, Py_MARSHAL_VERSION); if (bytes == NULL) { PyObject *cause = _PyErr_GetRaisedException(tstate); assert(cause != NULL); _set_xid_lookup_failure( tstate, NULL, "object could not be marshalled", cause); Py_DECREF(cause); return -1; } size_t size = sizeof(_PyBytes_data_t); _PyBytes_data_t *shared = _PyBytes_GetXIDataWrapped( tstate, bytes, size, _PyMarshal_ReadObjectFromXIData, xidata); Py_DECREF(bytes); if (shared == NULL) { return -1; } return 0; } /* script wrapper */ static int verify_script(PyThreadState *tstate, PyCodeObject *co, int checked, int pure) { // Make sure it isn't a closure and (optionally) doesn't use globals. PyObject *builtins = NULL; if (pure) { builtins = _PyEval_GetBuiltins(tstate); assert(builtins != NULL); } if (checked) { assert(_PyCode_VerifyStateless(tstate, co, NULL, NULL, builtins) == 0); } else if (_PyCode_VerifyStateless(tstate, co, NULL, NULL, builtins) < 0) { return -1; } // Make sure it doesn't have args. if (co->co_argcount > 0 || co->co_posonlyargcount > 0 || co->co_kwonlyargcount > 0 || co->co_flags & (CO_VARARGS | CO_VARKEYWORDS)) { _PyErr_SetString(tstate, PyExc_ValueError, "code with args not supported"); return -1; } // Make sure it doesn't return anything. if (!_PyCode_ReturnsOnlyNone(co)) { _PyErr_SetString(tstate, PyExc_ValueError, "code that returns a value is not a script"); return -1; } return 0; } static int get_script_xidata(PyThreadState *tstate, PyObject *obj, int pure, _PyXIData_t *xidata) { // Get the corresponding code object. PyObject *code = NULL; int checked = 0; if (PyCode_Check(obj)) { code = obj; Py_INCREF(code); } else if (PyFunction_Check(obj)) { code = PyFunction_GET_CODE(obj); assert(code != NULL); Py_INCREF(code); if (pure) { if (_PyFunction_VerifyStateless(tstate, obj) < 0) { goto error; } checked = 1; } } else { const char *filename = "<script>"; int optimize = 0; PyCompilerFlags cf = _PyCompilerFlags_INIT; cf.cf_flags = PyCF_SOURCE_IS_UTF8; PyObject *ref = NULL; const char *script = _Py_SourceAsString(obj, "???", "???", &cf, &ref); if (script == NULL) { if (!_PyObject_SupportedAsScript(obj)) { // We discard the raised exception. _PyErr_Format(tstate, PyExc_TypeError, "unsupported script %R", obj); } goto error; } #ifdef Py_GIL_DISABLED // Don't immortalize code constants to avoid memory leaks. ((_PyThreadStateImpl *)tstate)->suppress_co_const_immortalization++; #endif code = Py_CompileStringExFlags( script, filename, Py_file_input, &cf, optimize); #ifdef Py_GIL_DISABLED ((_PyThreadStateImpl *)tstate)->suppress_co_const_immortalization--; #endif Py_XDECREF(ref); if (code == NULL) { goto error; } // Compiled text can't have args or any return statements, // nor be a closure. It can use globals though. if (!pure) { // We don't need to check for globals either. checked = 1; } } // Make sure it's actually a script. if (verify_script(tstate, (PyCodeObject *)code, checked, pure) < 0) { goto error; } // Convert the code object. int res = _PyCode_GetXIData(tstate, code, xidata); Py_DECREF(code); if (res < 0) { return -1; } return 0; error: Py_XDECREF(code); PyObject *cause = _PyErr_GetRaisedException(tstate); assert(cause != NULL); _set_xid_lookup_failure( |
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