mirror of https://github.com/python/cpython
611 lines
14 KiB
C
611 lines
14 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 "eval.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_GC_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_TRACK(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(PyObject *op, PyObject *name)
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{
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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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/* If func_dict is being accessed but no attribute has been set
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* yet, then initialize it to the empty dictionary.
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*/
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if ((!strcmp(sname, "func_dict") || !strcmp(sname, "__dict__"))
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&& ((PyFunctionObject*)op)->func_dict == NULL)
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{
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PyFunctionObject* funcop = (PyFunctionObject*)op;
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funcop->func_dict = PyDict_New();
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if (funcop->func_dict == NULL)
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return NULL;
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}
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return PyObject_GenericGetAttr(op, name);
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}
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static int
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func_setattro(PyObject *op, PyObject *name, PyObject *value)
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{
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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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/* It is illegal to del f.func_dict. Can only set
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* func_dict to a dictionary.
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*/
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if (value == NULL) {
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PyErr_SetString(
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PyExc_TypeError,
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"function's dictionary may not be deleted");
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return -1;
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}
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if (!PyDict_Check(value)) {
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PyErr_SetString(
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PyExc_TypeError,
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"setting function's dictionary to a non-dict");
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return -1;
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}
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}
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return PyObject_GenericSetAttr(op, name, value);
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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_GC_UNTRACK(op);
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PyObject_ClearWeakRefs((PyObject *) 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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PyObject_GC_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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if (op->func_name == Py_None)
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return PyString_FromFormat("<anonymous function at %p>", op);
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return PyString_FromFormat("<function %s at %p>",
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PyString_AsString(op->func_name),
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op);
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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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static PyObject *
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function_call(PyObject *func, PyObject *arg, PyObject *kw)
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{
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PyObject *result;
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PyObject *argdefs;
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PyObject **d, **k;
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int nk, nd;
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argdefs = PyFunction_GET_DEFAULTS(func);
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if (argdefs != NULL && PyTuple_Check(argdefs)) {
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d = &PyTuple_GET_ITEM((PyTupleObject *)argdefs, 0);
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nd = PyTuple_Size(argdefs);
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}
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else {
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d = NULL;
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nd = 0;
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}
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if (kw != NULL && PyDict_Check(kw)) {
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int pos, i;
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nk = PyDict_Size(kw);
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k = PyMem_NEW(PyObject *, 2*nk);
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if (k == NULL) {
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PyErr_NoMemory();
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Py_DECREF(arg);
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return NULL;
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}
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pos = i = 0;
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while (PyDict_Next(kw, &pos, &k[i], &k[i+1]))
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i += 2;
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nk = i/2;
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/* XXX This is broken if the caller deletes dict items! */
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}
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else {
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k = NULL;
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nk = 0;
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}
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result = PyEval_EvalCodeEx(
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(PyCodeObject *)PyFunction_GET_CODE(func),
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PyFunction_GET_GLOBALS(func), (PyObject *)NULL,
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&PyTuple_GET_ITEM(arg, 0), PyTuple_Size(arg),
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k, nk, d, nd,
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PyFunction_GET_CLOSURE(func));
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if (k != NULL)
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PyMem_DEL(k);
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return result;
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}
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/* Bind a function to an object */
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static PyObject *
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func_descr_get(PyObject *func, PyObject *obj, PyObject *type)
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{
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if (obj == Py_None)
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obj = NULL;
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return PyMethod_New(func, obj, type);
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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),
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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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function_call, /* tp_call */
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0, /* tp_str */
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func_getattro, /* tp_getattro */
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func_setattro, /* tp_setattro */
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0, /* tp_as_buffer */
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Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_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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0, /* tp_iter */
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0, /* tp_iternext */
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0, /* tp_methods */
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func_memberlist, /* tp_members */
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0, /* tp_getset */
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0, /* tp_base */
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0, /* tp_dict */
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func_descr_get, /* tp_descr_get */
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0, /* tp_descr_set */
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offsetof(PyFunctionObject, func_dict), /* tp_dictoffset */
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};
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/* Class method object */
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/* A class method receives the class as implicit first argument,
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just like an instance method receives the instance.
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To declare a class method, use this idiom:
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class C:
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def f(cls, arg1, arg2, ...): ...
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f = classmethod(f)
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It can be called either on the class (e.g. C.f()) or on an instance
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(e.g. C().f()); the instance is ignored except for its class.
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If a class method is called for a derived class, the derived class
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object is passed as the implied first argument.
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Class methods are different than C++ or Java static methods.
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If you want those, see static methods below.
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*/
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typedef struct {
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PyObject_HEAD
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PyObject *cm_callable;
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} classmethod;
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static void
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cm_dealloc(classmethod *cm)
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{
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Py_XDECREF(cm->cm_callable);
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PyObject_DEL(cm);
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}
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static PyObject *
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cm_descr_get(PyObject *self, PyObject *obj, PyObject *type)
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{
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classmethod *cm = (classmethod *)self;
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if (cm->cm_callable == NULL) {
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PyErr_SetString(PyExc_RuntimeError,
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"uninitialized classmethod object");
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return NULL;
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}
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return PyMethod_New(cm->cm_callable,
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type, (PyObject *)(type->ob_type));
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}
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static int
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cm_init(PyObject *self, PyObject *args, PyObject *kwds)
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{
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classmethod *cm = (classmethod *)self;
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PyObject *callable;
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if (!PyArg_ParseTuple(args, "O:callable", &callable))
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return -1;
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Py_INCREF(callable);
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cm->cm_callable = callable;
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return 0;
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}
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PyTypeObject PyClassMethod_Type = {
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PyObject_HEAD_INIT(&PyType_Type)
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0,
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"classmethod",
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sizeof(classmethod),
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0,
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(destructor)cm_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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0, /* 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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PyObject_GenericGetAttr, /* tp_getattro */
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0, /* tp_setattro */
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0, /* tp_as_buffer */
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Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
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0, /* tp_doc */
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0, /* tp_traverse */
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0, /* tp_clear */
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0, /* tp_richcompare */
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0, /* tp_weaklistoffset */
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0, /* tp_iter */
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0, /* tp_iternext */
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0, /* tp_methods */
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0, /* tp_members */
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0, /* tp_getset */
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0, /* tp_base */
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0, /* tp_dict */
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cm_descr_get, /* tp_descr_get */
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0, /* tp_descr_set */
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0, /* tp_dictoffset */
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cm_init, /* tp_init */
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PyType_GenericAlloc, /* tp_alloc */
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PyType_GenericNew, /* tp_new */
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};
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PyObject *
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PyClassMethod_New(PyObject *callable)
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{
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classmethod *cm = (classmethod *)
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PyType_GenericAlloc(&PyClassMethod_Type, 0);
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if (cm != NULL) {
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Py_INCREF(callable);
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cm->cm_callable = callable;
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}
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return (PyObject *)cm;
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}
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/* Static method object */
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/* A static method does not receive an implicit first argument.
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To declare a static method, use this idiom:
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class C:
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def f(arg1, arg2, ...): ...
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f = staticmethod(f)
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It can be called either on the class (e.g. C.f()) or on an instance
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(e.g. C().f()); the instance is ignored except for its class.
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Static methods in Python are similar to those found in Java or C++.
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For a more advanced concept, see class methods above.
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*/
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typedef struct {
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PyObject_HEAD
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PyObject *sm_callable;
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} staticmethod;
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static void
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sm_dealloc(staticmethod *sm)
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{
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Py_XDECREF(sm->sm_callable);
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PyObject_DEL(sm);
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}
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static PyObject *
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sm_descr_get(PyObject *self, PyObject *obj, PyObject *type)
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{
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staticmethod *sm = (staticmethod *)self;
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if (sm->sm_callable == NULL) {
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PyErr_SetString(PyExc_RuntimeError,
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"uninitialized staticmethod object");
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return NULL;
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}
|
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Py_INCREF(sm->sm_callable);
|
|
return sm->sm_callable;
|
|
}
|
|
|
|
static int
|
|
sm_init(PyObject *self, PyObject *args, PyObject *kwds)
|
|
{
|
|
staticmethod *sm = (staticmethod *)self;
|
|
PyObject *callable;
|
|
|
|
if (!PyArg_ParseTuple(args, "O:callable", &callable))
|
|
return -1;
|
|
Py_INCREF(callable);
|
|
sm->sm_callable = callable;
|
|
return 0;
|
|
}
|
|
|
|
PyTypeObject PyStaticMethod_Type = {
|
|
PyObject_HEAD_INIT(&PyType_Type)
|
|
0,
|
|
"staticmethod",
|
|
sizeof(staticmethod),
|
|
0,
|
|
(destructor)sm_dealloc, /* tp_dealloc */
|
|
0, /* tp_print */
|
|
0, /* tp_getattr */
|
|
0, /* tp_setattr */
|
|
0, /* tp_compare */
|
|
0, /* tp_repr */
|
|
0, /* tp_as_number */
|
|
0, /* tp_as_sequence */
|
|
0, /* tp_as_mapping */
|
|
0, /* tp_hash */
|
|
0, /* tp_call */
|
|
0, /* tp_str */
|
|
PyObject_GenericGetAttr, /* tp_getattro */
|
|
0, /* tp_setattro */
|
|
0, /* tp_as_buffer */
|
|
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
|
|
0, /* tp_doc */
|
|
0, /* tp_traverse */
|
|
0, /* tp_clear */
|
|
0, /* tp_richcompare */
|
|
0, /* tp_weaklistoffset */
|
|
0, /* tp_iter */
|
|
0, /* tp_iternext */
|
|
0, /* tp_methods */
|
|
0, /* tp_members */
|
|
0, /* tp_getset */
|
|
0, /* tp_base */
|
|
0, /* tp_dict */
|
|
sm_descr_get, /* tp_descr_get */
|
|
0, /* tp_descr_set */
|
|
0, /* tp_dictoffset */
|
|
sm_init, /* tp_init */
|
|
PyType_GenericAlloc, /* tp_alloc */
|
|
PyType_GenericNew, /* tp_new */
|
|
};
|
|
|
|
PyObject *
|
|
PyStaticMethod_New(PyObject *callable)
|
|
{
|
|
staticmethod *sm = (staticmethod *)
|
|
PyType_GenericAlloc(&PyStaticMethod_Type, 0);
|
|
if (sm != NULL) {
|
|
Py_INCREF(callable);
|
|
sm->sm_callable = callable;
|
|
}
|
|
return (PyObject *)sm;
|
|
}
|