mirror of
https://github.com/python/cpython.git
synced 2024-11-21 12:59:38 +01:00
566 lines
18 KiB
C
566 lines
18 KiB
C
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/* Method object implementation */
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#include "Python.h"
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#include "pycore_call.h" // _Py_CheckFunctionResult()
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#include "pycore_ceval.h" // _Py_EnterRecursiveCallTstate()
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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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/* undefine macro trampoline to PyCFunction_NewEx */
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#undef PyCFunction_New
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/* undefine macro trampoline to PyCMethod_New */
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#undef PyCFunction_NewEx
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/* Forward declarations */
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static PyObject * cfunction_vectorcall_FASTCALL(
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PyObject *func, PyObject *const *args, size_t nargsf, PyObject *kwnames);
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static PyObject * cfunction_vectorcall_FASTCALL_KEYWORDS(
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PyObject *func, PyObject *const *args, size_t nargsf, PyObject *kwnames);
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static PyObject * cfunction_vectorcall_FASTCALL_KEYWORDS_METHOD(
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PyObject *func, PyObject *const *args, size_t nargsf, PyObject *kwnames);
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static PyObject * cfunction_vectorcall_NOARGS(
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PyObject *func, PyObject *const *args, size_t nargsf, PyObject *kwnames);
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static PyObject * cfunction_vectorcall_O(
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PyObject *func, PyObject *const *args, size_t nargsf, PyObject *kwnames);
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static PyObject * cfunction_call(
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PyObject *func, PyObject *args, PyObject *kwargs);
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PyObject *
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PyCFunction_New(PyMethodDef *ml, PyObject *self)
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{
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return PyCFunction_NewEx(ml, self, NULL);
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}
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PyObject *
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PyCFunction_NewEx(PyMethodDef *ml, PyObject *self, PyObject *module)
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{
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return PyCMethod_New(ml, self, module, NULL);
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}
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PyObject *
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PyCMethod_New(PyMethodDef *ml, PyObject *self, PyObject *module, PyTypeObject *cls)
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{
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/* Figure out correct vectorcall function to use */
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vectorcallfunc vectorcall;
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switch (ml->ml_flags & (METH_VARARGS | METH_FASTCALL | METH_NOARGS |
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METH_O | METH_KEYWORDS | METH_METHOD))
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{
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case METH_VARARGS:
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case METH_VARARGS | METH_KEYWORDS:
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/* For METH_VARARGS functions, it's more efficient to use tp_call
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* instead of vectorcall. */
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vectorcall = NULL;
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break;
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case METH_FASTCALL:
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vectorcall = cfunction_vectorcall_FASTCALL;
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break;
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case METH_FASTCALL | METH_KEYWORDS:
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vectorcall = cfunction_vectorcall_FASTCALL_KEYWORDS;
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break;
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case METH_NOARGS:
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vectorcall = cfunction_vectorcall_NOARGS;
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break;
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case METH_O:
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vectorcall = cfunction_vectorcall_O;
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break;
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case METH_METHOD | METH_FASTCALL | METH_KEYWORDS:
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vectorcall = cfunction_vectorcall_FASTCALL_KEYWORDS_METHOD;
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break;
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default:
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PyErr_Format(PyExc_SystemError,
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"%s() method: bad call flags", ml->ml_name);
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return NULL;
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}
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PyCFunctionObject *op = NULL;
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if (ml->ml_flags & METH_METHOD) {
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if (!cls) {
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PyErr_SetString(PyExc_SystemError,
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"attempting to create PyCMethod with a METH_METHOD "
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"flag but no class");
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return NULL;
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}
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PyCMethodObject *om = PyObject_GC_New(PyCMethodObject, &PyCMethod_Type);
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if (om == NULL) {
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return NULL;
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}
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om->mm_class = (PyTypeObject*)Py_NewRef(cls);
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op = (PyCFunctionObject *)om;
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} else {
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if (cls) {
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PyErr_SetString(PyExc_SystemError,
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"attempting to create PyCFunction with class "
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"but no METH_METHOD flag");
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return NULL;
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}
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op = PyObject_GC_New(PyCFunctionObject, &PyCFunction_Type);
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if (op == NULL) {
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return NULL;
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}
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}
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op->m_weakreflist = NULL;
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op->m_ml = ml;
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op->m_self = Py_XNewRef(self);
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op->m_module = Py_XNewRef(module);
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op->vectorcall = vectorcall;
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_PyObject_GC_TRACK(op);
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return (PyObject *)op;
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}
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PyCFunction
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PyCFunction_GetFunction(PyObject *op)
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{
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if (!PyCFunction_Check(op)) {
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PyErr_BadInternalCall();
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return NULL;
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}
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return PyCFunction_GET_FUNCTION(op);
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}
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PyObject *
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PyCFunction_GetSelf(PyObject *op)
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{
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if (!PyCFunction_Check(op)) {
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PyErr_BadInternalCall();
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return NULL;
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}
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return PyCFunction_GET_SELF(op);
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}
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int
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PyCFunction_GetFlags(PyObject *op)
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{
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if (!PyCFunction_Check(op)) {
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PyErr_BadInternalCall();
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return -1;
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}
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return PyCFunction_GET_FLAGS(op);
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}
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PyTypeObject *
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PyCMethod_GetClass(PyObject *op)
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{
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if (!PyCFunction_Check(op)) {
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PyErr_BadInternalCall();
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return NULL;
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}
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return PyCFunction_GET_CLASS(op);
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}
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/* Methods (the standard built-in methods, that is) */
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static void
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meth_dealloc(PyObject *self)
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{
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PyCFunctionObject *m = _PyCFunctionObject_CAST(self);
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// The Py_TRASHCAN mechanism requires that we be able to
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// call PyObject_GC_UnTrack twice on an object.
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PyObject_GC_UnTrack(m);
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Py_TRASHCAN_BEGIN(m, meth_dealloc);
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if (m->m_weakreflist != NULL) {
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PyObject_ClearWeakRefs((PyObject*) m);
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}
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// Dereference class before m_self: PyCFunction_GET_CLASS accesses
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// PyMethodDef m_ml, which could be kept alive by m_self
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Py_XDECREF(PyCFunction_GET_CLASS(m));
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Py_XDECREF(m->m_self);
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Py_XDECREF(m->m_module);
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PyObject_GC_Del(m);
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Py_TRASHCAN_END;
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}
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static PyObject *
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meth_reduce(PyObject *self, PyObject *Py_UNUSED(ignored))
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{
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PyCFunctionObject *m = _PyCFunctionObject_CAST(self);
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if (m->m_self == NULL || PyModule_Check(m->m_self))
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return PyUnicode_FromString(m->m_ml->ml_name);
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return Py_BuildValue("N(Os)", _PyEval_GetBuiltin(&_Py_ID(getattr)),
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m->m_self, m->m_ml->ml_name);
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}
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static PyMethodDef meth_methods[] = {
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{"__reduce__", meth_reduce, METH_NOARGS, NULL},
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{NULL, NULL}
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};
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static PyObject *
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meth_get__text_signature__(PyObject *self, void *closure)
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{
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PyCFunctionObject *m = _PyCFunctionObject_CAST(self);
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return _PyType_GetTextSignatureFromInternalDoc(m->m_ml->ml_name,
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m->m_ml->ml_doc,
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m->m_ml->ml_flags);
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}
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static PyObject *
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meth_get__doc__(PyObject *self, void *closure)
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{
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PyCFunctionObject *m = _PyCFunctionObject_CAST(self);
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return _PyType_GetDocFromInternalDoc(m->m_ml->ml_name, m->m_ml->ml_doc);
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}
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static PyObject *
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meth_get__name__(PyObject *self, void *closure)
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{
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PyCFunctionObject *m = _PyCFunctionObject_CAST(self);
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return PyUnicode_FromString(m->m_ml->ml_name);
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}
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static PyObject *
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meth_get__qualname__(PyObject *self, void *closure)
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{
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/* If __self__ is a module or NULL, return m.__name__
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(e.g. len.__qualname__ == 'len')
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If __self__ is a type, return m.__self__.__qualname__ + '.' + m.__name__
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(e.g. dict.fromkeys.__qualname__ == 'dict.fromkeys')
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Otherwise return type(m.__self__).__qualname__ + '.' + m.__name__
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(e.g. [].append.__qualname__ == 'list.append') */
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PyCFunctionObject *m = _PyCFunctionObject_CAST(self);
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if (m->m_self == NULL || PyModule_Check(m->m_self)) {
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return PyUnicode_FromString(m->m_ml->ml_name);
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}
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PyObject *type = PyType_Check(m->m_self) ? m->m_self : (PyObject*)Py_TYPE(m->m_self);
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PyObject *type_qualname = PyObject_GetAttr(type, &_Py_ID(__qualname__));
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if (type_qualname == NULL)
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return NULL;
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if (!PyUnicode_Check(type_qualname)) {
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PyErr_SetString(PyExc_TypeError, "<method>.__class__."
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"__qualname__ is not a unicode object");
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Py_XDECREF(type_qualname);
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return NULL;
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}
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PyObject *res = PyUnicode_FromFormat("%S.%s", type_qualname, m->m_ml->ml_name);
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Py_DECREF(type_qualname);
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return res;
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}
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static int
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meth_traverse(PyObject *self, visitproc visit, void *arg)
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{
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PyCFunctionObject *m = _PyCFunctionObject_CAST(self);
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Py_VISIT(PyCFunction_GET_CLASS(m));
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Py_VISIT(m->m_self);
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Py_VISIT(m->m_module);
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return 0;
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}
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static PyObject *
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meth_get__self__(PyObject *meth, void *closure)
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{
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PyCFunctionObject *m = _PyCFunctionObject_CAST(meth);
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PyObject *self = PyCFunction_GET_SELF(m);
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if (self == NULL) {
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self = Py_None;
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}
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return Py_NewRef(self);
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}
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static PyGetSetDef meth_getsets[] = {
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{"__doc__", meth_get__doc__, NULL, NULL},
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{"__name__", meth_get__name__, NULL, NULL},
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{"__qualname__", meth_get__qualname__, NULL, NULL},
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{"__self__", meth_get__self__, NULL, NULL},
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{"__text_signature__", meth_get__text_signature__, NULL, NULL},
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{0}
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};
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#define OFF(x) offsetof(PyCFunctionObject, x)
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static PyMemberDef meth_members[] = {
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{"__module__", _Py_T_OBJECT, OFF(m_module), 0},
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{NULL}
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};
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static PyObject *
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meth_repr(PyObject *self)
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{
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PyCFunctionObject *m = _PyCFunctionObject_CAST(self);
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if (m->m_self == NULL || PyModule_Check(m->m_self)) {
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return PyUnicode_FromFormat("<built-in function %s>",
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m->m_ml->ml_name);
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}
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return PyUnicode_FromFormat("<built-in method %s of %s object at %p>",
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m->m_ml->ml_name,
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Py_TYPE(m->m_self)->tp_name,
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m->m_self);
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}
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static PyObject *
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meth_richcompare(PyObject *self, PyObject *other, int op)
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{
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PyCFunctionObject *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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!PyCFunction_Check(self) ||
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!PyCFunction_Check(other))
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{
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Py_RETURN_NOTIMPLEMENTED;
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}
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a = (PyCFunctionObject *)self;
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b = (PyCFunctionObject *)other;
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eq = a->m_self == b->m_self;
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if (eq)
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eq = a->m_ml->ml_meth == b->m_ml->ml_meth;
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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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return Py_NewRef(res);
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}
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static Py_hash_t
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meth_hash(PyObject *self)
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{
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PyCFunctionObject *a = _PyCFunctionObject_CAST(self);
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Py_hash_t x = PyObject_GenericHash(a->m_self);
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Py_hash_t y = _Py_HashPointer((void*)(a->m_ml->ml_meth));
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x ^= y;
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if (x == -1) {
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x = -2;
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}
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return x;
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}
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PyTypeObject PyCFunction_Type = {
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PyVarObject_HEAD_INIT(&PyType_Type, 0)
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"builtin_function_or_method",
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sizeof(PyCFunctionObject),
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0,
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meth_dealloc, /* tp_dealloc */
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offsetof(PyCFunctionObject, 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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meth_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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meth_hash, /* tp_hash */
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cfunction_call, /* 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_HAVE_GC |
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Py_TPFLAGS_HAVE_VECTORCALL, /* tp_flags */
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0, /* tp_doc */
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meth_traverse, /* tp_traverse */
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0, /* tp_clear */
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meth_richcompare, /* tp_richcompare */
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offsetof(PyCFunctionObject, m_weakreflist), /* tp_weaklistoffset */
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0, /* tp_iter */
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0, /* tp_iternext */
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meth_methods, /* tp_methods */
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meth_members, /* tp_members */
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meth_getsets, /* tp_getset */
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0, /* tp_base */
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0, /* tp_dict */
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};
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PyTypeObject PyCMethod_Type = {
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PyVarObject_HEAD_INIT(&PyType_Type, 0)
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.tp_name = "builtin_method",
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.tp_basicsize = sizeof(PyCMethodObject),
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.tp_base = &PyCFunction_Type,
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};
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/* Vectorcall functions for each of the PyCFunction calling conventions,
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* except for METH_VARARGS (possibly combined with METH_KEYWORDS) which
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* doesn't use vectorcall.
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*
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* First, common helpers
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*/
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static inline int
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cfunction_check_kwargs(PyThreadState *tstate, PyObject *func, PyObject *kwnames)
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{
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assert(!_PyErr_Occurred(tstate));
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assert(PyCFunction_Check(func));
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if (kwnames && PyTuple_GET_SIZE(kwnames)) {
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PyObject *funcstr = _PyObject_FunctionStr(func);
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if (funcstr != NULL) {
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_PyErr_Format(tstate, PyExc_TypeError,
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"%U takes no keyword arguments", funcstr);
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Py_DECREF(funcstr);
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}
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return -1;
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}
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return 0;
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}
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typedef void (*funcptr)(void);
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static inline funcptr
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cfunction_enter_call(PyThreadState *tstate, PyObject *func)
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{
|
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if (_Py_EnterRecursiveCallTstate(tstate, " while calling a Python object")) {
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return NULL;
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}
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return (funcptr)PyCFunction_GET_FUNCTION(func);
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}
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|
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/* Now the actual vectorcall functions */
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static PyObject *
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cfunction_vectorcall_FASTCALL(
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PyObject *func, PyObject *const *args, size_t nargsf, PyObject *kwnames)
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{
|
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PyThreadState *tstate = _PyThreadState_GET();
|
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if (cfunction_check_kwargs(tstate, func, kwnames)) {
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return NULL;
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}
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Py_ssize_t nargs = PyVectorcall_NARGS(nargsf);
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PyCFunctionFast meth = (PyCFunctionFast)
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cfunction_enter_call(tstate, func);
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if (meth == NULL) {
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return NULL;
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}
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PyObject *result = meth(PyCFunction_GET_SELF(func), args, nargs);
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_Py_LeaveRecursiveCallTstate(tstate);
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return result;
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}
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static PyObject *
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cfunction_vectorcall_FASTCALL_KEYWORDS(
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PyObject *func, PyObject *const *args, size_t nargsf, PyObject *kwnames)
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{
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PyThreadState *tstate = _PyThreadState_GET();
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Py_ssize_t nargs = PyVectorcall_NARGS(nargsf);
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PyCFunctionFastWithKeywords meth = (PyCFunctionFastWithKeywords)
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cfunction_enter_call(tstate, func);
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if (meth == NULL) {
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return NULL;
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}
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PyObject *result = meth(PyCFunction_GET_SELF(func), args, nargs, kwnames);
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_Py_LeaveRecursiveCallTstate(tstate);
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return result;
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}
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static PyObject *
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cfunction_vectorcall_FASTCALL_KEYWORDS_METHOD(
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PyObject *func, PyObject *const *args, size_t nargsf, PyObject *kwnames)
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{
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PyThreadState *tstate = _PyThreadState_GET();
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PyTypeObject *cls = PyCFunction_GET_CLASS(func);
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Py_ssize_t nargs = PyVectorcall_NARGS(nargsf);
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PyCMethod meth = (PyCMethod)cfunction_enter_call(tstate, func);
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if (meth == NULL) {
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return NULL;
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}
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PyObject *result = meth(PyCFunction_GET_SELF(func), cls, args, nargs, kwnames);
|
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_Py_LeaveRecursiveCallTstate(tstate);
|
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return result;
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}
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static PyObject *
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cfunction_vectorcall_NOARGS(
|
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PyObject *func, PyObject *const *args, size_t nargsf, PyObject *kwnames)
|
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{
|
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PyThreadState *tstate = _PyThreadState_GET();
|
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if (cfunction_check_kwargs(tstate, func, kwnames)) {
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return NULL;
|
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}
|
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Py_ssize_t nargs = PyVectorcall_NARGS(nargsf);
|
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if (nargs != 0) {
|
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PyObject *funcstr = _PyObject_FunctionStr(func);
|
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if (funcstr != NULL) {
|
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_PyErr_Format(tstate, PyExc_TypeError,
|
|
"%U takes no arguments (%zd given)", funcstr, nargs);
|
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Py_DECREF(funcstr);
|
|
}
|
|
return NULL;
|
|
}
|
|
PyCFunction meth = (PyCFunction)cfunction_enter_call(tstate, func);
|
|
if (meth == NULL) {
|
|
return NULL;
|
|
}
|
|
PyObject *result = _PyCFunction_TrampolineCall(
|
|
meth, PyCFunction_GET_SELF(func), NULL);
|
|
_Py_LeaveRecursiveCallTstate(tstate);
|
|
return result;
|
|
}
|
|
|
|
static PyObject *
|
|
cfunction_vectorcall_O(
|
|
PyObject *func, PyObject *const *args, size_t nargsf, PyObject *kwnames)
|
|
{
|
|
PyThreadState *tstate = _PyThreadState_GET();
|
|
if (cfunction_check_kwargs(tstate, func, kwnames)) {
|
|
return NULL;
|
|
}
|
|
Py_ssize_t nargs = PyVectorcall_NARGS(nargsf);
|
|
if (nargs != 1) {
|
|
PyObject *funcstr = _PyObject_FunctionStr(func);
|
|
if (funcstr != NULL) {
|
|
_PyErr_Format(tstate, PyExc_TypeError,
|
|
"%U takes exactly one argument (%zd given)", funcstr, nargs);
|
|
Py_DECREF(funcstr);
|
|
}
|
|
return NULL;
|
|
}
|
|
PyCFunction meth = (PyCFunction)cfunction_enter_call(tstate, func);
|
|
if (meth == NULL) {
|
|
return NULL;
|
|
}
|
|
PyObject *result = _PyCFunction_TrampolineCall(
|
|
meth, PyCFunction_GET_SELF(func), args[0]);
|
|
_Py_LeaveRecursiveCallTstate(tstate);
|
|
return result;
|
|
}
|
|
|
|
|
|
static PyObject *
|
|
cfunction_call(PyObject *func, PyObject *args, PyObject *kwargs)
|
|
{
|
|
assert(kwargs == NULL || PyDict_Check(kwargs));
|
|
|
|
PyThreadState *tstate = _PyThreadState_GET();
|
|
assert(!_PyErr_Occurred(tstate));
|
|
|
|
int flags = PyCFunction_GET_FLAGS(func);
|
|
if (!(flags & METH_VARARGS)) {
|
|
/* If this is not a METH_VARARGS function, delegate to vectorcall */
|
|
return PyVectorcall_Call(func, args, kwargs);
|
|
}
|
|
|
|
/* For METH_VARARGS, we cannot use vectorcall as the vectorcall pointer
|
|
* is NULL. This is intentional, since vectorcall would be slower. */
|
|
PyCFunction meth = PyCFunction_GET_FUNCTION(func);
|
|
PyObject *self = PyCFunction_GET_SELF(func);
|
|
|
|
PyObject *result;
|
|
if (flags & METH_KEYWORDS) {
|
|
result = _PyCFunctionWithKeywords_TrampolineCall(
|
|
(*(PyCFunctionWithKeywords)(void(*)(void))meth),
|
|
self, args, kwargs);
|
|
}
|
|
else {
|
|
if (kwargs != NULL && PyDict_GET_SIZE(kwargs) != 0) {
|
|
_PyErr_Format(tstate, PyExc_TypeError,
|
|
"%.200s() takes no keyword arguments",
|
|
((PyCFunctionObject*)func)->m_ml->ml_name);
|
|
return NULL;
|
|
}
|
|
result = _PyCFunction_TrampolineCall(meth, self, args);
|
|
}
|
|
return _Py_CheckFunctionResult(tstate, func, result, NULL);
|
|
}
|