Staging
v0.8.1
v0.8.1
https://github.com/python/cpython
Tip revision: 74f4bd53e03ded8408bcc2de67cf0f5a4ac5b1a1 authored by Barry Warsaw on 23 February 2012, 15:59:38 UTC
Bump some more copyright years (as per PEP 101), since this is the first
Bump some more copyright years (as per PEP 101), since this is the first
Tip revision: 74f4bd5
methodobject.c
/* Method object implementation */
#include "Python.h"
#include "structmember.h"
/* Free list for method objects to safe malloc/free overhead
* The m_self element is used to chain the objects.
*/
static PyCFunctionObject *free_list = NULL;
static int numfree = 0;
#ifndef PyCFunction_MAXFREELIST
#define PyCFunction_MAXFREELIST 256
#endif
PyObject *
PyCFunction_NewEx(PyMethodDef *ml, PyObject *self, PyObject *module)
{
PyCFunctionObject *op;
op = free_list;
if (op != NULL) {
free_list = (PyCFunctionObject *)(op->m_self);
PyObject_INIT(op, &PyCFunction_Type);
numfree--;
}
else {
op = PyObject_GC_New(PyCFunctionObject, &PyCFunction_Type);
if (op == NULL)
return NULL;
}
op->m_ml = ml;
Py_XINCREF(self);
op->m_self = self;
Py_XINCREF(module);
op->m_module = module;
_PyObject_GC_TRACK(op);
return (PyObject *)op;
}
PyCFunction
PyCFunction_GetFunction(PyObject *op)
{
if (!PyCFunction_Check(op)) {
PyErr_BadInternalCall();
return NULL;
}
return ((PyCFunctionObject *)op) -> m_ml -> ml_meth;
}
PyObject *
PyCFunction_GetSelf(PyObject *op)
{
if (!PyCFunction_Check(op)) {
PyErr_BadInternalCall();
return NULL;
}
return ((PyCFunctionObject *)op) -> m_self;
}
int
PyCFunction_GetFlags(PyObject *op)
{
if (!PyCFunction_Check(op)) {
PyErr_BadInternalCall();
return -1;
}
return ((PyCFunctionObject *)op) -> m_ml -> ml_flags;
}
PyObject *
PyCFunction_Call(PyObject *func, PyObject *arg, PyObject *kw)
{
PyCFunctionObject* f = (PyCFunctionObject*)func;
PyCFunction meth = PyCFunction_GET_FUNCTION(func);
PyObject *self = PyCFunction_GET_SELF(func);
Py_ssize_t size;
switch (PyCFunction_GET_FLAGS(func) & ~(METH_CLASS | METH_STATIC | METH_COEXIST)) {
case METH_VARARGS:
if (kw == NULL || PyDict_Size(kw) == 0)
return (*meth)(self, arg);
break;
case METH_VARARGS | METH_KEYWORDS:
case METH_OLDARGS | METH_KEYWORDS:
return (*(PyCFunctionWithKeywords)meth)(self, arg, kw);
case METH_NOARGS:
if (kw == NULL || PyDict_Size(kw) == 0) {
size = PyTuple_GET_SIZE(arg);
if (size == 0)
return (*meth)(self, NULL);
PyErr_Format(PyExc_TypeError,
"%.200s() takes no arguments (%zd given)",
f->m_ml->ml_name, size);
return NULL;
}
break;
case METH_O:
if (kw == NULL || PyDict_Size(kw) == 0) {
size = PyTuple_GET_SIZE(arg);
if (size == 1)
return (*meth)(self, PyTuple_GET_ITEM(arg, 0));
PyErr_Format(PyExc_TypeError,
"%.200s() takes exactly one argument (%zd given)",
f->m_ml->ml_name, size);
return NULL;
}
break;
case METH_OLDARGS:
/* the really old style */
if (kw == NULL || PyDict_Size(kw) == 0) {
size = PyTuple_GET_SIZE(arg);
if (size == 1)
arg = PyTuple_GET_ITEM(arg, 0);
else if (size == 0)
arg = NULL;
return (*meth)(self, arg);
}
break;
default:
PyErr_BadInternalCall();
return NULL;
}
PyErr_Format(PyExc_TypeError, "%.200s() takes no keyword arguments",
f->m_ml->ml_name);
return NULL;
}
/* Methods (the standard built-in methods, that is) */
static void
meth_dealloc(PyCFunctionObject *m)
{
_PyObject_GC_UNTRACK(m);
Py_XDECREF(m->m_self);
Py_XDECREF(m->m_module);
if (numfree < PyCFunction_MAXFREELIST) {
m->m_self = (PyObject *)free_list;
free_list = m;
numfree++;
}
else {
PyObject_GC_Del(m);
}
}
static PyObject *
meth_get__doc__(PyCFunctionObject *m, void *closure)
{
const char *doc = m->m_ml->ml_doc;
if (doc != NULL)
return PyString_FromString(doc);
Py_INCREF(Py_None);
return Py_None;
}
static PyObject *
meth_get__name__(PyCFunctionObject *m, void *closure)
{
return PyString_FromString(m->m_ml->ml_name);
}
static int
meth_traverse(PyCFunctionObject *m, visitproc visit, void *arg)
{
Py_VISIT(m->m_self);
Py_VISIT(m->m_module);
return 0;
}
static PyObject *
meth_get__self__(PyCFunctionObject *m, void *closure)
{
PyObject *self;
if (PyEval_GetRestricted()) {
PyErr_SetString(PyExc_RuntimeError,
"method.__self__ not accessible in restricted mode");
return NULL;
}
self = m->m_self;
if (self == NULL)
self = Py_None;
Py_INCREF(self);
return self;
}
static PyGetSetDef meth_getsets [] = {
{"__doc__", (getter)meth_get__doc__, NULL, NULL},
{"__name__", (getter)meth_get__name__, NULL, NULL},
{"__self__", (getter)meth_get__self__, NULL, NULL},
{0}
};
#define OFF(x) offsetof(PyCFunctionObject, x)
static PyMemberDef meth_members[] = {
{"__module__", T_OBJECT, OFF(m_module), PY_WRITE_RESTRICTED},
{NULL}
};
static PyObject *
meth_repr(PyCFunctionObject *m)
{
if (m->m_self == NULL)
return PyString_FromFormat("<built-in function %s>",
m->m_ml->ml_name);
return PyString_FromFormat("<built-in method %s of %s object at %p>",
m->m_ml->ml_name,
m->m_self->ob_type->tp_name,
m->m_self);
}
static int
meth_compare(PyCFunctionObject *a, PyCFunctionObject *b)
{
if (a->m_self != b->m_self)
return (a->m_self < b->m_self) ? -1 : 1;
if (a->m_ml->ml_meth == b->m_ml->ml_meth)
return 0;
if (strcmp(a->m_ml->ml_name, b->m_ml->ml_name) < 0)
return -1;
else
return 1;
}
static PyObject *
meth_richcompare(PyObject *self, PyObject *other, int op)
{
PyCFunctionObject *a, *b;
PyObject *res;
int eq;
if (op != Py_EQ && op != Py_NE) {
/* Py3K warning if comparison isn't == or !=. */
if (PyErr_WarnPy3k("builtin_function_or_method order "
"comparisons not supported in 3.x", 1) < 0) {
return NULL;
}
Py_INCREF(Py_NotImplemented);
return Py_NotImplemented;
}
else if (!PyCFunction_Check(self) || !PyCFunction_Check(other)) {
Py_INCREF(Py_NotImplemented);
return Py_NotImplemented;
}
a = (PyCFunctionObject *)self;
b = (PyCFunctionObject *)other;
eq = a->m_self == b->m_self;
if (eq)
eq = a->m_ml->ml_meth == b->m_ml->ml_meth;
if (op == Py_EQ)
res = eq ? Py_True : Py_False;
else
res = eq ? Py_False : Py_True;
Py_INCREF(res);
return res;
}
static long
meth_hash(PyCFunctionObject *a)
{
long x,y;
if (a->m_self == NULL)
x = 0;
else {
x = PyObject_Hash(a->m_self);
if (x == -1)
return -1;
}
y = _Py_HashPointer((void*)(a->m_ml->ml_meth));
if (y == -1)
return -1;
x ^= y;
if (x == -1)
x = -2;
return x;
}
PyTypeObject PyCFunction_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"builtin_function_or_method",
sizeof(PyCFunctionObject),
0,
(destructor)meth_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
(cmpfunc)meth_compare, /* tp_compare */
(reprfunc)meth_repr, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
(hashfunc)meth_hash, /* tp_hash */
PyCFunction_Call, /* tp_call */
0, /* tp_str */
PyObject_GenericGetAttr, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */
0, /* tp_doc */
(traverseproc)meth_traverse, /* tp_traverse */
0, /* tp_clear */
meth_richcompare, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
0, /* tp_methods */
meth_members, /* tp_members */
meth_getsets, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
};
/* List all methods in a chain -- helper for findmethodinchain */
static PyObject *
listmethodchain(PyMethodChain *chain)
{
PyMethodChain *c;
PyMethodDef *ml;
int i, n;
PyObject *v;
n = 0;
for (c = chain; c != NULL; c = c->link) {
for (ml = c->methods; ml->ml_name != NULL; ml++)
n++;
}
v = PyList_New(n);
if (v == NULL)
return NULL;
i = 0;
for (c = chain; c != NULL; c = c->link) {
for (ml = c->methods; ml->ml_name != NULL; ml++) {
PyList_SetItem(v, i, PyString_FromString(ml->ml_name));
i++;
}
}
if (PyErr_Occurred()) {
Py_DECREF(v);
return NULL;
}
PyList_Sort(v);
return v;
}
/* Find a method in a method chain */
PyObject *
Py_FindMethodInChain(PyMethodChain *chain, PyObject *self, const char *name)
{
if (name[0] == '_' && name[1] == '_') {
if (strcmp(name, "__methods__") == 0) {
if (PyErr_WarnPy3k("__methods__ not supported in 3.x",
1) < 0)
return NULL;
return listmethodchain(chain);
}
if (strcmp(name, "__doc__") == 0) {
const char *doc = self->ob_type->tp_doc;
if (doc != NULL)
return PyString_FromString(doc);
}
}
while (chain != NULL) {
PyMethodDef *ml = chain->methods;
for (; ml->ml_name != NULL; ml++) {
if (name[0] == ml->ml_name[0] &&
strcmp(name+1, ml->ml_name+1) == 0)
/* XXX */
return PyCFunction_New(ml, self);
}
chain = chain->link;
}
PyErr_SetString(PyExc_AttributeError, name);
return NULL;
}
/* Find a method in a single method list */
PyObject *
Py_FindMethod(PyMethodDef *methods, PyObject *self, const char *name)
{
PyMethodChain chain;
chain.methods = methods;
chain.link = NULL;
return Py_FindMethodInChain(&chain, self, name);
}
/* Clear out the free list */
int
PyCFunction_ClearFreeList(void)
{
int freelist_size = numfree;
while (free_list) {
PyCFunctionObject *v = free_list;
free_list = (PyCFunctionObject *)(v->m_self);
PyObject_GC_Del(v);
numfree--;
}
assert(numfree == 0);
return freelist_size;
}
void
PyCFunction_Fini(void)
{
(void)PyCFunction_ClearFreeList();
}
/* PyCFunction_New() is now just a macro that calls PyCFunction_NewEx(),
but it's part of the API so we need to keep a function around that
existing C extensions can call.
*/
#undef PyCFunction_New
PyAPI_FUNC(PyObject *) PyCFunction_New(PyMethodDef *, PyObject *);
PyObject *
PyCFunction_New(PyMethodDef *ml, PyObject *self)
{
return PyCFunction_NewEx(ml, self, NULL);
}