mirror of https://github.com/python/cpython
345 lines
8.6 KiB
C
345 lines
8.6 KiB
C
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/* Function object implementation */
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#include "Python.h"
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#include "compile.h"
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#include "structmember.h"
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PyObject *
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PyFunction_New(PyObject *code, PyObject *globals)
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{
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PyFunctionObject *op = PyObject_NEW(PyFunctionObject,
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&PyFunction_Type);
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if (op != NULL) {
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PyObject *doc;
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PyObject *consts;
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op->func_weakreflist = NULL;
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Py_INCREF(code);
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op->func_code = code;
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Py_INCREF(globals);
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op->func_globals = globals;
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op->func_name = ((PyCodeObject *)code)->co_name;
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Py_INCREF(op->func_name);
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op->func_defaults = NULL; /* No default arguments */
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op->func_closure = NULL;
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consts = ((PyCodeObject *)code)->co_consts;
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if (PyTuple_Size(consts) >= 1) {
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doc = PyTuple_GetItem(consts, 0);
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if (!PyString_Check(doc) && !PyUnicode_Check(doc))
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doc = Py_None;
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}
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else
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doc = Py_None;
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Py_INCREF(doc);
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op->func_doc = doc;
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op->func_dict = NULL;
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}
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else
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return NULL;
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PyObject_GC_Init(op);
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return (PyObject *)op;
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}
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PyObject *
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PyFunction_GetCode(PyObject *op)
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{
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if (!PyFunction_Check(op)) {
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PyErr_BadInternalCall();
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return NULL;
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}
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return ((PyFunctionObject *) op) -> func_code;
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}
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PyObject *
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PyFunction_GetGlobals(PyObject *op)
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{
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if (!PyFunction_Check(op)) {
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PyErr_BadInternalCall();
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return NULL;
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}
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return ((PyFunctionObject *) op) -> func_globals;
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}
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PyObject *
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PyFunction_GetDefaults(PyObject *op)
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{
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if (!PyFunction_Check(op)) {
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PyErr_BadInternalCall();
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return NULL;
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}
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return ((PyFunctionObject *) op) -> func_defaults;
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}
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int
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PyFunction_SetDefaults(PyObject *op, PyObject *defaults)
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{
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if (!PyFunction_Check(op)) {
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PyErr_BadInternalCall();
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return -1;
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}
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if (defaults == Py_None)
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defaults = NULL;
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else if (PyTuple_Check(defaults)) {
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Py_XINCREF(defaults);
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}
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else {
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PyErr_SetString(PyExc_SystemError, "non-tuple default args");
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return -1;
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}
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Py_XDECREF(((PyFunctionObject *) op) -> func_defaults);
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((PyFunctionObject *) op) -> func_defaults = defaults;
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return 0;
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}
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PyObject *
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PyFunction_GetClosure(PyObject *op)
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{
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if (!PyFunction_Check(op)) {
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PyErr_BadInternalCall();
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return NULL;
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}
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return ((PyFunctionObject *) op) -> func_closure;
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}
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int
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PyFunction_SetClosure(PyObject *op, PyObject *closure)
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{
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if (!PyFunction_Check(op)) {
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PyErr_BadInternalCall();
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return -1;
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}
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if (closure == Py_None)
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closure = NULL;
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else if (PyTuple_Check(closure)) {
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Py_XINCREF(closure);
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}
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else {
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PyErr_SetString(PyExc_SystemError, "non-tuple closure");
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return -1;
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}
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Py_XDECREF(((PyFunctionObject *) op) -> func_closure);
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((PyFunctionObject *) op) -> func_closure = closure;
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return 0;
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}
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/* Methods */
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#define OFF(x) offsetof(PyFunctionObject, x)
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static struct memberlist func_memberlist[] = {
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{"func_code", T_OBJECT, OFF(func_code)},
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{"func_globals", T_OBJECT, OFF(func_globals), READONLY},
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{"func_name", T_OBJECT, OFF(func_name), READONLY},
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{"__name__", T_OBJECT, OFF(func_name), READONLY},
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{"func_closure", T_OBJECT, OFF(func_closure), READONLY},
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{"func_defaults", T_OBJECT, OFF(func_defaults)},
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{"func_doc", T_OBJECT, OFF(func_doc)},
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{"__doc__", T_OBJECT, OFF(func_doc)},
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{"func_dict", T_OBJECT, OFF(func_dict)},
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{"__dict__", T_OBJECT, OFF(func_dict)},
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{NULL} /* Sentinel */
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};
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static PyObject *
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func_getattro(PyFunctionObject *op, PyObject *name)
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{
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PyObject *rtn;
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char *sname = PyString_AsString(name);
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if (sname[0] != '_' && PyEval_GetRestricted()) {
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PyErr_SetString(PyExc_RuntimeError,
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"function attributes not accessible in restricted mode");
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return NULL;
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}
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/* no API for PyMember_HasAttr() */
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rtn = PyMember_Get((char *)op, func_memberlist, sname);
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if (rtn == NULL && PyErr_ExceptionMatches(PyExc_AttributeError)) {
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PyErr_Clear();
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if (op->func_dict != NULL) {
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rtn = PyDict_GetItem(op->func_dict, name);
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Py_XINCREF(rtn);
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}
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if (rtn == NULL)
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PyErr_SetObject(PyExc_AttributeError, name);
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}
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return rtn;
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}
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static int
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func_setattro(PyFunctionObject *op, PyObject *name, PyObject *value)
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{
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int rtn;
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char *sname = PyString_AsString(name);
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if (PyEval_GetRestricted()) {
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PyErr_SetString(PyExc_RuntimeError,
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"function attributes not settable in restricted mode");
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return -1;
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}
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if (strcmp(sname, "func_code") == 0) {
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/* not legal to del f.func_code or to set it to anything
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* other than a code object.
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*/
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if (value == NULL || !PyCode_Check(value)) {
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PyErr_SetString(
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PyExc_TypeError,
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"func_code must be set to a code object");
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return -1;
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}
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}
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else if (strcmp(sname, "func_defaults") == 0) {
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/* legal to del f.func_defaults. Can only set
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* func_defaults to NULL or a tuple.
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*/
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if (value == Py_None)
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value = NULL;
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if (value != NULL && !PyTuple_Check(value)) {
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PyErr_SetString(
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PyExc_TypeError,
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"func_defaults must be set to a tuple object");
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return -1;
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}
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}
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else if (!strcmp(sname, "func_dict") || !strcmp(sname, "__dict__")) {
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/* legal to del f.func_dict. Can only set func_dict to
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* NULL or a dictionary.
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*/
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if (value == Py_None)
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value = NULL;
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if (value != NULL && !PyDict_Check(value)) {
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PyErr_SetString(
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PyExc_TypeError,
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"func_dict must be set to a dict object");
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return -1;
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}
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}
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rtn = PyMember_Set((char *)op, func_memberlist, sname, value);
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if (rtn < 0 && PyErr_ExceptionMatches(PyExc_AttributeError)) {
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PyErr_Clear();
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if (op->func_dict == NULL) {
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/* don't create the dict if we're deleting an
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* attribute. In that case, we know we'll get an
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* AttributeError.
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*/
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if (value == NULL) {
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PyErr_SetString(PyExc_AttributeError, sname);
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return -1;
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}
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op->func_dict = PyDict_New();
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if (op->func_dict == NULL)
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return -1;
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}
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if (value == NULL)
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rtn = PyDict_DelItem(op->func_dict, name);
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else
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rtn = PyDict_SetItem(op->func_dict, name, value);
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/* transform KeyError into AttributeError */
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if (rtn < 0 && PyErr_ExceptionMatches(PyExc_KeyError))
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PyErr_SetString(PyExc_AttributeError, sname);
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}
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return rtn;
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}
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static void
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func_dealloc(PyFunctionObject *op)
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{
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PyObject_ClearWeakRefs((PyObject *) op);
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PyObject_GC_Fini(op);
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Py_DECREF(op->func_code);
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Py_DECREF(op->func_globals);
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Py_DECREF(op->func_name);
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Py_XDECREF(op->func_defaults);
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Py_XDECREF(op->func_doc);
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Py_XDECREF(op->func_dict);
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Py_XDECREF(op->func_closure);
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op = (PyFunctionObject *) PyObject_AS_GC(op);
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PyObject_DEL(op);
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}
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static PyObject*
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func_repr(PyFunctionObject *op)
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{
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char buf[140];
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if (op->func_name == Py_None)
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sprintf(buf, "<anonymous function at %p>", op);
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else
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sprintf(buf, "<function %.100s at %p>",
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PyString_AsString(op->func_name),
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op);
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return PyString_FromString(buf);
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}
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static int
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func_traverse(PyFunctionObject *f, visitproc visit, void *arg)
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{
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int err;
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if (f->func_code) {
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err = visit(f->func_code, arg);
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if (err)
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return err;
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}
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if (f->func_globals) {
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err = visit(f->func_globals, arg);
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if (err)
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return err;
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}
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if (f->func_defaults) {
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err = visit(f->func_defaults, arg);
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if (err)
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return err;
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}
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if (f->func_doc) {
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err = visit(f->func_doc, arg);
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if (err)
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return err;
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}
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if (f->func_name) {
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err = visit(f->func_name, arg);
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if (err)
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return err;
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}
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if (f->func_dict) {
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err = visit(f->func_dict, arg);
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if (err)
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return err;
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}
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if (f->func_closure) {
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err = visit(f->func_closure, arg);
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if (err)
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return err;
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}
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return 0;
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}
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PyTypeObject PyFunction_Type = {
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PyObject_HEAD_INIT(&PyType_Type)
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0,
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"function",
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sizeof(PyFunctionObject) + PyGC_HEAD_SIZE,
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0,
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(destructor)func_dealloc, /* tp_dealloc */
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0, /* tp_print */
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0, /* tp_getattr */
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0, /* tp_setattr */
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0, /* tp_compare */
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(reprfunc)func_repr, /* tp_repr */
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0, /* tp_as_number */
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0, /* tp_as_sequence */
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0, /* tp_as_mapping */
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0, /* tp_hash */
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0, /* tp_call */
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0, /* tp_str */
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(getattrofunc)func_getattro, /* tp_getattro */
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(setattrofunc)func_setattro, /* tp_setattro */
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0, /* tp_as_buffer */
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Py_TPFLAGS_DEFAULT | Py_TPFLAGS_GC, /* tp_flags */
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0, /* tp_doc */
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(traverseproc)func_traverse, /* tp_traverse */
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0, /* tp_clear */
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0, /* tp_richcompare */
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offsetof(PyFunctionObject, func_weakreflist), /* tp_weaklistoffset */
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};
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