mirror of
https://github.com/python/cpython.git
synced 2025-10-25 18:54:53 +00:00
81c72044a1
We're no longer using _Py_IDENTIFIER() (or _Py_static_string()) in any core CPython code. It is still used in a number of non-builtin stdlib modules. The replacement is: PyUnicodeObject (not pointer) fields under _PyRuntimeState, statically initialized as part of _PyRuntime. A new _Py_GET_GLOBAL_IDENTIFIER() macro facilitates lookup of the fields (along with _Py_GET_GLOBAL_STRING() for non-identifier strings). https://bugs.python.org/issue46541#msg411799 explains the rationale for this change. The core of the change is in: * (new) Include/internal/pycore_global_strings.h - the declarations for the global strings, along with the macros * Include/internal/pycore_runtime_init.h - added the static initializers for the global strings * Include/internal/pycore_global_objects.h - where the struct in pycore_global_strings.h is hooked into _PyRuntimeState * Tools/scripts/generate_global_objects.py - added generation of the global string declarations and static initializers I've also added a --check flag to generate_global_objects.py (along with make check-global-objects) to check for unused global strings. That check is added to the PR CI config. The remainder of this change updates the core code to use _Py_GET_GLOBAL_IDENTIFIER() instead of _Py_IDENTIFIER() and the related _Py*Id functions (likewise for _Py_GET_GLOBAL_STRING() instead of _Py_static_string()). This includes adding a few functions where there wasn't already an alternative to _Py*Id(), replacing the _Py_Identifier * parameter with PyObject *. The following are not changed (yet): * stop using _Py_IDENTIFIER() in the stdlib modules * (maybe) get rid of _Py_IDENTIFIER(), etc. entirely -- this may not be doable as at least one package on PyPI using this (private) API * (maybe) intern the strings during runtime init https://bugs.python.org/issue46541
609 lines
18 KiB
C
609 lines
18 KiB
C
/* Class object implementation (dead now except for methods) */
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#include "Python.h"
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#include "pycore_call.h" // _PyObject_VectorcallTstate()
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#include "pycore_object.h"
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#include "pycore_pyerrors.h"
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#include "pycore_pystate.h" // _PyThreadState_GET()
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#include "structmember.h" // PyMemberDef
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#define TP_DESCR_GET(t) ((t)->tp_descr_get)
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PyObject *
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PyMethod_Function(PyObject *im)
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{
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if (!PyMethod_Check(im)) {
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PyErr_BadInternalCall();
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return NULL;
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}
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return ((PyMethodObject *)im)->im_func;
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}
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PyObject *
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PyMethod_Self(PyObject *im)
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{
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if (!PyMethod_Check(im)) {
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PyErr_BadInternalCall();
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return NULL;
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}
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return ((PyMethodObject *)im)->im_self;
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}
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static PyObject *
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method_vectorcall(PyObject *method, PyObject *const *args,
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size_t nargsf, PyObject *kwnames)
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{
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assert(Py_IS_TYPE(method, &PyMethod_Type));
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PyThreadState *tstate = _PyThreadState_GET();
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PyObject *self = PyMethod_GET_SELF(method);
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PyObject *func = PyMethod_GET_FUNCTION(method);
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Py_ssize_t nargs = PyVectorcall_NARGS(nargsf);
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PyObject *result;
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if (nargsf & PY_VECTORCALL_ARGUMENTS_OFFSET) {
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/* PY_VECTORCALL_ARGUMENTS_OFFSET is set, so we are allowed to mutate the vector */
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PyObject **newargs = (PyObject**)args - 1;
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nargs += 1;
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PyObject *tmp = newargs[0];
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newargs[0] = self;
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result = _PyObject_VectorcallTstate(tstate, func, newargs,
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nargs, kwnames);
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newargs[0] = tmp;
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}
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else {
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Py_ssize_t nkwargs = (kwnames == NULL) ? 0 : PyTuple_GET_SIZE(kwnames);
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Py_ssize_t totalargs = nargs + nkwargs;
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if (totalargs == 0) {
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return _PyObject_VectorcallTstate(tstate, func, &self, 1, NULL);
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}
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PyObject *newargs_stack[_PY_FASTCALL_SMALL_STACK];
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PyObject **newargs;
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if (totalargs <= (Py_ssize_t)Py_ARRAY_LENGTH(newargs_stack) - 1) {
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newargs = newargs_stack;
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}
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else {
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newargs = PyMem_Malloc((totalargs+1) * sizeof(PyObject *));
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if (newargs == NULL) {
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_PyErr_NoMemory(tstate);
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return NULL;
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}
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}
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/* use borrowed references */
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newargs[0] = self;
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/* bpo-37138: since totalargs > 0, it's impossible that args is NULL.
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* We need this, since calling memcpy() with a NULL pointer is
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* undefined behaviour. */
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assert(args != NULL);
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memcpy(newargs + 1, args, totalargs * sizeof(PyObject *));
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result = _PyObject_VectorcallTstate(tstate, func,
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newargs, nargs+1, kwnames);
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if (newargs != newargs_stack) {
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PyMem_Free(newargs);
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}
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}
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return result;
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}
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/* Method objects are used for bound instance methods returned by
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instancename.methodname. ClassName.methodname returns an ordinary
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function.
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*/
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PyObject *
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PyMethod_New(PyObject *func, PyObject *self)
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{
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if (self == NULL) {
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PyErr_BadInternalCall();
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return NULL;
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}
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PyMethodObject *im = PyObject_GC_New(PyMethodObject, &PyMethod_Type);
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if (im == NULL) {
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return NULL;
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}
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im->im_weakreflist = NULL;
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Py_INCREF(func);
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im->im_func = func;
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Py_INCREF(self);
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im->im_self = self;
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im->vectorcall = method_vectorcall;
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_PyObject_GC_TRACK(im);
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return (PyObject *)im;
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}
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static PyObject *
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method_reduce(PyMethodObject *im, PyObject *Py_UNUSED(ignored))
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{
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PyObject *self = PyMethod_GET_SELF(im);
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PyObject *func = PyMethod_GET_FUNCTION(im);
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PyObject *funcname;
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funcname = PyObject_GetAttr(func, &_Py_ID(__name__));
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if (funcname == NULL) {
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return NULL;
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}
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return Py_BuildValue(
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"N(ON)", _PyEval_GetBuiltin(&_Py_ID(getattr)), self, funcname);
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}
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static PyMethodDef method_methods[] = {
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{"__reduce__", (PyCFunction)method_reduce, METH_NOARGS, NULL},
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{NULL, NULL}
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};
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/* Descriptors for PyMethod attributes */
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/* im_func and im_self are stored in the PyMethod object */
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#define MO_OFF(x) offsetof(PyMethodObject, x)
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static PyMemberDef method_memberlist[] = {
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{"__func__", T_OBJECT, MO_OFF(im_func), READONLY,
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"the function (or other callable) implementing a method"},
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{"__self__", T_OBJECT, MO_OFF(im_self), READONLY,
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"the instance to which a method is bound"},
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{NULL} /* Sentinel */
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};
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/* Christian Tismer argued convincingly that method attributes should
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(nearly) always override function attributes.
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The one exception is __doc__; there's a default __doc__ which
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should only be used for the class, not for instances */
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static PyObject *
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method_get_doc(PyMethodObject *im, void *context)
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{
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static PyObject *docstr;
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if (docstr == NULL) {
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docstr= PyUnicode_InternFromString("__doc__");
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if (docstr == NULL)
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return NULL;
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}
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return PyObject_GetAttr(im->im_func, docstr);
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}
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static PyGetSetDef method_getset[] = {
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{"__doc__", (getter)method_get_doc, NULL, NULL},
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{0}
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};
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static PyObject *
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method_getattro(PyObject *obj, PyObject *name)
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{
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PyMethodObject *im = (PyMethodObject *)obj;
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PyTypeObject *tp = Py_TYPE(obj);
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PyObject *descr = NULL;
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{
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if (tp->tp_dict == NULL) {
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if (PyType_Ready(tp) < 0)
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return NULL;
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}
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descr = _PyType_Lookup(tp, name);
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}
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if (descr != NULL) {
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descrgetfunc f = TP_DESCR_GET(Py_TYPE(descr));
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if (f != NULL)
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return f(descr, obj, (PyObject *)Py_TYPE(obj));
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else {
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Py_INCREF(descr);
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return descr;
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}
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}
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return PyObject_GetAttr(im->im_func, name);
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}
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PyDoc_STRVAR(method_doc,
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"method(function, instance)\n\
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\n\
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Create a bound instance method object.");
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static PyObject *
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method_new(PyTypeObject* type, PyObject* args, PyObject *kw)
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{
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PyObject *func;
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PyObject *self;
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if (!_PyArg_NoKeywords("method", kw))
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return NULL;
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if (!PyArg_UnpackTuple(args, "method", 2, 2,
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&func, &self))
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return NULL;
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if (!PyCallable_Check(func)) {
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PyErr_SetString(PyExc_TypeError,
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"first argument must be callable");
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return NULL;
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}
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if (self == NULL || self == Py_None) {
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PyErr_SetString(PyExc_TypeError,
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"self must not be None");
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return NULL;
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}
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return PyMethod_New(func, self);
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}
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static void
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method_dealloc(PyMethodObject *im)
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{
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_PyObject_GC_UNTRACK(im);
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if (im->im_weakreflist != NULL)
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PyObject_ClearWeakRefs((PyObject *)im);
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Py_DECREF(im->im_func);
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Py_XDECREF(im->im_self);
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PyObject_GC_Del(im);
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}
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static PyObject *
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method_richcompare(PyObject *self, PyObject *other, int op)
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{
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PyMethodObject *a, *b;
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PyObject *res;
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int eq;
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if ((op != Py_EQ && op != Py_NE) ||
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!PyMethod_Check(self) ||
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!PyMethod_Check(other))
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{
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Py_RETURN_NOTIMPLEMENTED;
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}
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a = (PyMethodObject *)self;
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b = (PyMethodObject *)other;
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eq = PyObject_RichCompareBool(a->im_func, b->im_func, Py_EQ);
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if (eq == 1) {
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eq = (a->im_self == b->im_self);
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}
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else if (eq < 0)
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return NULL;
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if (op == Py_EQ)
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res = eq ? Py_True : Py_False;
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else
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res = eq ? Py_False : Py_True;
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Py_INCREF(res);
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return res;
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}
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static PyObject *
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method_repr(PyMethodObject *a)
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{
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PyObject *self = a->im_self;
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PyObject *func = a->im_func;
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PyObject *funcname, *result;
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const char *defname = "?";
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if (_PyObject_LookupAttr(func, &_Py_ID(__qualname__), &funcname) < 0 ||
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(funcname == NULL &&
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_PyObject_LookupAttr(func, &_Py_ID(__name__), &funcname) < 0))
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{
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return NULL;
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}
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if (funcname != NULL && !PyUnicode_Check(funcname)) {
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Py_DECREF(funcname);
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funcname = NULL;
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}
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/* XXX Shouldn't use repr()/%R here! */
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result = PyUnicode_FromFormat("<bound method %V of %R>",
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funcname, defname, self);
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Py_XDECREF(funcname);
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return result;
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}
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static Py_hash_t
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method_hash(PyMethodObject *a)
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{
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Py_hash_t x, y;
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x = _Py_HashPointer(a->im_self);
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y = PyObject_Hash(a->im_func);
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if (y == -1)
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return -1;
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x = x ^ y;
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if (x == -1)
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x = -2;
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return x;
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}
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static int
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method_traverse(PyMethodObject *im, visitproc visit, void *arg)
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{
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Py_VISIT(im->im_func);
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Py_VISIT(im->im_self);
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return 0;
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}
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static PyObject *
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method_descr_get(PyObject *meth, PyObject *obj, PyObject *cls)
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{
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Py_INCREF(meth);
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return meth;
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}
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PyTypeObject PyMethod_Type = {
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PyVarObject_HEAD_INIT(&PyType_Type, 0)
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"method",
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sizeof(PyMethodObject),
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0,
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(destructor)method_dealloc, /* tp_dealloc */
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offsetof(PyMethodObject, vectorcall), /* tp_vectorcall_offset */
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0, /* tp_getattr */
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0, /* tp_setattr */
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0, /* tp_as_async */
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(reprfunc)method_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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(hashfunc)method_hash, /* tp_hash */
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PyVectorcall_Call, /* tp_call */
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0, /* tp_str */
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method_getattro, /* tp_getattro */
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PyObject_GenericSetAttr, /* tp_setattro */
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0, /* tp_as_buffer */
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Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
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Py_TPFLAGS_HAVE_VECTORCALL, /* tp_flags */
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method_doc, /* tp_doc */
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(traverseproc)method_traverse, /* tp_traverse */
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0, /* tp_clear */
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method_richcompare, /* tp_richcompare */
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offsetof(PyMethodObject, im_weakreflist), /* tp_weaklistoffset */
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0, /* tp_iter */
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0, /* tp_iternext */
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method_methods, /* tp_methods */
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method_memberlist, /* tp_members */
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method_getset, /* tp_getset */
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0, /* tp_base */
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0, /* tp_dict */
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method_descr_get, /* tp_descr_get */
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0, /* tp_descr_set */
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0, /* tp_dictoffset */
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0, /* tp_init */
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0, /* tp_alloc */
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method_new, /* tp_new */
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};
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/* ------------------------------------------------------------------------
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* instance method
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*/
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PyObject *
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PyInstanceMethod_New(PyObject *func) {
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PyInstanceMethodObject *method;
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method = PyObject_GC_New(PyInstanceMethodObject,
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&PyInstanceMethod_Type);
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if (method == NULL) return NULL;
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Py_INCREF(func);
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method->func = func;
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_PyObject_GC_TRACK(method);
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return (PyObject *)method;
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}
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PyObject *
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PyInstanceMethod_Function(PyObject *im)
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{
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if (!PyInstanceMethod_Check(im)) {
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PyErr_BadInternalCall();
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return NULL;
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}
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return PyInstanceMethod_GET_FUNCTION(im);
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}
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#define IMO_OFF(x) offsetof(PyInstanceMethodObject, x)
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static PyMemberDef instancemethod_memberlist[] = {
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{"__func__", T_OBJECT, IMO_OFF(func), READONLY,
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"the function (or other callable) implementing a method"},
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{NULL} /* Sentinel */
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};
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static PyObject *
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instancemethod_get_doc(PyObject *self, void *context)
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{
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static PyObject *docstr;
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if (docstr == NULL) {
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docstr = PyUnicode_InternFromString("__doc__");
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if (docstr == NULL)
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return NULL;
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}
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return PyObject_GetAttr(PyInstanceMethod_GET_FUNCTION(self), docstr);
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}
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static PyGetSetDef instancemethod_getset[] = {
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{"__doc__", (getter)instancemethod_get_doc, NULL, NULL},
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{0}
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};
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static PyObject *
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instancemethod_getattro(PyObject *self, PyObject *name)
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{
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PyTypeObject *tp = Py_TYPE(self);
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PyObject *descr = NULL;
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if (tp->tp_dict == NULL) {
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if (PyType_Ready(tp) < 0)
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return NULL;
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}
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descr = _PyType_Lookup(tp, name);
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if (descr != NULL) {
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descrgetfunc f = TP_DESCR_GET(Py_TYPE(descr));
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if (f != NULL)
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return f(descr, self, (PyObject *)Py_TYPE(self));
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else {
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Py_INCREF(descr);
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return descr;
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}
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}
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return PyObject_GetAttr(PyInstanceMethod_GET_FUNCTION(self), name);
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}
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static void
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instancemethod_dealloc(PyObject *self) {
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_PyObject_GC_UNTRACK(self);
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Py_DECREF(PyInstanceMethod_GET_FUNCTION(self));
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PyObject_GC_Del(self);
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}
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static int
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instancemethod_traverse(PyObject *self, visitproc visit, void *arg) {
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Py_VISIT(PyInstanceMethod_GET_FUNCTION(self));
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return 0;
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}
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static PyObject *
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instancemethod_call(PyObject *self, PyObject *arg, PyObject *kw)
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{
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return PyObject_Call(PyInstanceMethod_GET_FUNCTION(self), arg, kw);
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}
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static PyObject *
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instancemethod_descr_get(PyObject *descr, PyObject *obj, PyObject *type) {
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PyObject *func = PyInstanceMethod_GET_FUNCTION(descr);
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if (obj == NULL) {
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Py_INCREF(func);
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return func;
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}
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else
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return PyMethod_New(func, obj);
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}
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static PyObject *
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instancemethod_richcompare(PyObject *self, PyObject *other, int op)
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{
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PyInstanceMethodObject *a, *b;
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PyObject *res;
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int eq;
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if ((op != Py_EQ && op != Py_NE) ||
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!PyInstanceMethod_Check(self) ||
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!PyInstanceMethod_Check(other))
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{
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Py_RETURN_NOTIMPLEMENTED;
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}
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a = (PyInstanceMethodObject *)self;
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b = (PyInstanceMethodObject *)other;
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eq = PyObject_RichCompareBool(a->func, b->func, Py_EQ);
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if (eq < 0)
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return NULL;
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if (op == Py_EQ)
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res = eq ? Py_True : Py_False;
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else
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res = eq ? Py_False : Py_True;
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Py_INCREF(res);
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return res;
|
|
}
|
|
|
|
static PyObject *
|
|
instancemethod_repr(PyObject *self)
|
|
{
|
|
PyObject *func = PyInstanceMethod_Function(self);
|
|
PyObject *funcname, *result;
|
|
const char *defname = "?";
|
|
|
|
if (func == NULL) {
|
|
PyErr_BadInternalCall();
|
|
return NULL;
|
|
}
|
|
|
|
if (_PyObject_LookupAttr(func, &_Py_ID(__name__), &funcname) < 0) {
|
|
return NULL;
|
|
}
|
|
if (funcname != NULL && !PyUnicode_Check(funcname)) {
|
|
Py_DECREF(funcname);
|
|
funcname = NULL;
|
|
}
|
|
|
|
result = PyUnicode_FromFormat("<instancemethod %V at %p>",
|
|
funcname, defname, self);
|
|
|
|
Py_XDECREF(funcname);
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
static long
|
|
instancemethod_hash(PyObject *self)
|
|
{
|
|
long x, y;
|
|
x = (long)self;
|
|
y = PyObject_Hash(PyInstanceMethod_GET_FUNCTION(self));
|
|
if (y == -1)
|
|
return -1;
|
|
x = x ^ y;
|
|
if (x == -1)
|
|
x = -2;
|
|
return x;
|
|
}
|
|
*/
|
|
|
|
PyDoc_STRVAR(instancemethod_doc,
|
|
"instancemethod(function)\n\
|
|
\n\
|
|
Bind a function to a class.");
|
|
|
|
static PyObject *
|
|
instancemethod_new(PyTypeObject* type, PyObject* args, PyObject *kw)
|
|
{
|
|
PyObject *func;
|
|
|
|
if (!_PyArg_NoKeywords("instancemethod", kw))
|
|
return NULL;
|
|
if (!PyArg_UnpackTuple(args, "instancemethod", 1, 1, &func))
|
|
return NULL;
|
|
if (!PyCallable_Check(func)) {
|
|
PyErr_SetString(PyExc_TypeError,
|
|
"first argument must be callable");
|
|
return NULL;
|
|
}
|
|
|
|
return PyInstanceMethod_New(func);
|
|
}
|
|
|
|
PyTypeObject PyInstanceMethod_Type = {
|
|
PyVarObject_HEAD_INIT(&PyType_Type, 0)
|
|
"instancemethod", /* tp_name */
|
|
sizeof(PyInstanceMethodObject), /* tp_basicsize */
|
|
0, /* tp_itemsize */
|
|
instancemethod_dealloc, /* tp_dealloc */
|
|
0, /* tp_vectorcall_offset */
|
|
0, /* tp_getattr */
|
|
0, /* tp_setattr */
|
|
0, /* tp_as_async */
|
|
(reprfunc)instancemethod_repr, /* tp_repr */
|
|
0, /* tp_as_number */
|
|
0, /* tp_as_sequence */
|
|
0, /* tp_as_mapping */
|
|
0, /*(hashfunc)instancemethod_hash, tp_hash */
|
|
instancemethod_call, /* tp_call */
|
|
0, /* tp_str */
|
|
instancemethod_getattro, /* tp_getattro */
|
|
PyObject_GenericSetAttr, /* tp_setattro */
|
|
0, /* tp_as_buffer */
|
|
Py_TPFLAGS_DEFAULT
|
|
| Py_TPFLAGS_HAVE_GC, /* tp_flags */
|
|
instancemethod_doc, /* tp_doc */
|
|
instancemethod_traverse, /* tp_traverse */
|
|
0, /* tp_clear */
|
|
instancemethod_richcompare, /* tp_richcompare */
|
|
0, /* tp_weaklistoffset */
|
|
0, /* tp_iter */
|
|
0, /* tp_iternext */
|
|
0, /* tp_methods */
|
|
instancemethod_memberlist, /* tp_members */
|
|
instancemethod_getset, /* tp_getset */
|
|
0, /* tp_base */
|
|
0, /* tp_dict */
|
|
instancemethod_descr_get, /* tp_descr_get */
|
|
0, /* tp_descr_set */
|
|
0, /* tp_dictoffset */
|
|
0, /* tp_init */
|
|
0, /* tp_alloc */
|
|
instancemethod_new, /* tp_new */
|
|
};
|