/* Abstract Object Interface (many thanks to Jim Fulton) */ #include "Python.h" #include #include "structmember.h" /* we need the offsetof() macro from there */ #include "longintrepr.h" /* Shorthands to return certain errors */ static PyObject * type_error(const char *msg, PyObject *obj) { PyErr_Format(PyExc_TypeError, msg, obj->ob_type->tp_name); return NULL; } static PyObject * null_error(void) { if (!PyErr_Occurred()) PyErr_SetString(PyExc_SystemError, "null argument to internal routine"); return NULL; } /* Operations on any object */ PyObject * PyObject_Type(PyObject *o) { PyObject *v; if (o == NULL) return null_error(); v = (PyObject *)o->ob_type; Py_INCREF(v); return v; } Py_ssize_t PyObject_Size(PyObject *o) { PySequenceMethods *m; if (o == NULL) { null_error(); return -1; } m = o->ob_type->tp_as_sequence; if (m && m->sq_length) return m->sq_length(o); return PyMapping_Size(o); } #undef PyObject_Length Py_ssize_t PyObject_Length(PyObject *o) { return PyObject_Size(o); } #define PyObject_Length PyObject_Size /* The length hint function returns a non-negative value from o.__len__() or o.__length_hint__(). If those methods aren't found or return a negative value, then the defaultvalue is returned. This function never fails. Accordingly, it will mask exceptions raised in either method. */ Py_ssize_t _PyObject_LengthHint(PyObject *o, Py_ssize_t defaultvalue) { static PyObject *hintstrobj = NULL; PyObject *ro; Py_ssize_t rv; /* try o.__len__() */ rv = PyObject_Size(o); if (rv >= 0) return rv; if (PyErr_Occurred()) PyErr_Clear(); /* cache a hashed version of the attribute string */ if (hintstrobj == NULL) { hintstrobj = PyUnicode_InternFromString("__length_hint__"); if (hintstrobj == NULL) goto defaultcase; } /* try o.__length_hint__() */ ro = PyObject_CallMethodObjArgs(o, hintstrobj, NULL); if (ro == NULL) goto defaultcase; rv = PyLong_AsSsize_t(ro); Py_DECREF(ro); if (rv >= 0) return rv; defaultcase: if (PyErr_Occurred()) PyErr_Clear(); return defaultvalue; } PyObject * PyObject_GetItem(PyObject *o, PyObject *key) { PyMappingMethods *m; if (o == NULL || key == NULL) return null_error(); m = o->ob_type->tp_as_mapping; if (m && m->mp_subscript) return m->mp_subscript(o, key); if (o->ob_type->tp_as_sequence) { if (PyIndex_Check(key)) { Py_ssize_t key_value; key_value = PyNumber_AsSsize_t(key, PyExc_IndexError); if (key_value == -1 && PyErr_Occurred()) return NULL; return PySequence_GetItem(o, key_value); } else if (o->ob_type->tp_as_sequence->sq_item) return type_error("sequence index must " "be integer, not '%.200s'", key); } return type_error("'%.200s' object is unsubscriptable", o); } int PyObject_SetItem(PyObject *o, PyObject *key, PyObject *value) { PyMappingMethods *m; if (o == NULL || key == NULL || value == NULL) { null_error(); return -1; } m = o->ob_type->tp_as_mapping; if (m && m->mp_ass_subscript) return m->mp_ass_subscript(o, key, value); if (o->ob_type->tp_as_sequence) { if (PyIndex_Check(key)) { Py_ssize_t key_value; key_value = PyNumber_AsSsize_t(key, PyExc_IndexError); if (key_value == -1 && PyErr_Occurred()) return -1; return PySequence_SetItem(o, key_value, value); } else if (o->ob_type->tp_as_sequence->sq_ass_item) { type_error("sequence index must be " "integer, not '%.200s'", key); return -1; } } type_error("'%.200s' object does not support item assignment", o); return -1; } int PyObject_DelItem(PyObject *o, PyObject *key) { PyMappingMethods *m; if (o == NULL || key == NULL) { null_error(); return -1; } m = o->ob_type->tp_as_mapping; if (m && m->mp_ass_subscript) return m->mp_ass_subscript(o, key, (PyObject*)NULL); if (o->ob_type->tp_as_sequence) { if (PyIndex_Check(key)) { Py_ssize_t key_value; key_value = PyNumber_AsSsize_t(key, PyExc_IndexError); if (key_value == -1 && PyErr_Occurred()) return -1; return PySequence_DelItem(o, key_value); } else if (o->ob_type->tp_as_sequence->sq_ass_item) { type_error("sequence index must be " "integer, not '%.200s'", key); return -1; } } type_error("'%.200s' object does not support item deletion", o); return -1; } int PyObject_DelItemString(PyObject *o, char *key) { PyObject *okey; int ret; if (o == NULL || key == NULL) { null_error(); return -1; } okey = PyUnicode_FromString(key); if (okey == NULL) return -1; ret = PyObject_DelItem(o, okey); Py_DECREF(okey); return ret; } /* We release the buffer right after use of this function which could cause issues later on. Don't use these functions in new code. */ int PyObject_AsCharBuffer(PyObject *obj, const char **buffer, Py_ssize_t *buffer_len) { PyBufferProcs *pb; Py_buffer view; if (obj == NULL || buffer == NULL || buffer_len == NULL) { null_error(); return -1; } pb = obj->ob_type->tp_as_buffer; if (pb == NULL || pb->bf_getbuffer == NULL) { PyErr_SetString(PyExc_TypeError, "expected an object with the buffer interface"); return -1; } if ((*pb->bf_getbuffer)(obj, &view, PyBUF_SIMPLE)) return -1; *buffer = view.buf; *buffer_len = view.len; if (pb->bf_releasebuffer != NULL) (*pb->bf_releasebuffer)(obj, &view); Py_XDECREF(view.obj); return 0; } int PyObject_CheckReadBuffer(PyObject *obj) { PyBufferProcs *pb = obj->ob_type->tp_as_buffer; Py_buffer view; if (pb == NULL || pb->bf_getbuffer == NULL) return 0; if ((*pb->bf_getbuffer)(obj, &view, PyBUF_SIMPLE) == -1) { PyErr_Clear(); return 0; } PyBuffer_Release(&view); return 1; } int PyObject_AsReadBuffer(PyObject *obj, const void **buffer, Py_ssize_t *buffer_len) { PyBufferProcs *pb; Py_buffer view; if (obj == NULL || buffer == NULL || buffer_len == NULL) { null_error(); return -1; } pb = obj->ob_type->tp_as_buffer; if (pb == NULL || pb->bf_getbuffer == NULL) { PyErr_SetString(PyExc_TypeError, "expected an object with a buffer interface"); return -1; } if ((*pb->bf_getbuffer)(obj, &view, PyBUF_SIMPLE)) return -1; *buffer = view.buf; *buffer_len = view.len; if (pb->bf_releasebuffer != NULL) (*pb->bf_releasebuffer)(obj, &view); Py_XDECREF(view.obj); return 0; } int PyObject_AsWriteBuffer(PyObject *obj, void **buffer, Py_ssize_t *buffer_len) { PyBufferProcs *pb; Py_buffer view; if (obj == NULL || buffer == NULL || buffer_len == NULL) { null_error(); return -1; } pb = obj->ob_type->tp_as_buffer; if (pb == NULL || pb->bf_getbuffer == NULL || ((*pb->bf_getbuffer)(obj, &view, PyBUF_WRITABLE) != 0)) { PyErr_SetString(PyExc_TypeError, "expected an object with a writable buffer interface"); return -1; } *buffer = view.buf; *buffer_len = view.len; if (pb->bf_releasebuffer != NULL) (*pb->bf_releasebuffer)(obj, &view); Py_XDECREF(view.obj); return 0; } /* Buffer C-API for Python 3.0 */ int PyObject_GetBuffer(PyObject *obj, Py_buffer *view, int flags) { if (!PyObject_CheckBuffer(obj)) { PyErr_Format(PyExc_TypeError, "'%100s' does not have the buffer interface", Py_TYPE(obj)->tp_name); return -1; } return (*(obj->ob_type->tp_as_buffer->bf_getbuffer))(obj, view, flags); } static int _IsFortranContiguous(Py_buffer *view) { Py_ssize_t sd, dim; int i; if (view->ndim == 0) return 1; if (view->strides == NULL) return (view->ndim == 1); sd = view->itemsize; if (view->ndim == 1) return (view->shape[0] == 1 || sd == view->strides[0]); for (i=0; indim; i++) { dim = view->shape[i]; if (dim == 0) return 1; if (view->strides[i] != sd) return 0; sd *= dim; } return 1; } static int _IsCContiguous(Py_buffer *view) { Py_ssize_t sd, dim; int i; if (view->ndim == 0) return 1; if (view->strides == NULL) return 1; sd = view->itemsize; if (view->ndim == 1) return (view->shape[0] == 1 || sd == view->strides[0]); for (i=view->ndim-1; i>=0; i--) { dim = view->shape[i]; if (dim == 0) return 1; if (view->strides[i] != sd) return 0; sd *= dim; } return 1; } int PyBuffer_IsContiguous(Py_buffer *view, char fort) { if (view->suboffsets != NULL) return 0; if (fort == 'C') return _IsCContiguous(view); else if (fort == 'F') return _IsFortranContiguous(view); else if (fort == 'A') return (_IsCContiguous(view) || _IsFortranContiguous(view)); return 0; } void* PyBuffer_GetPointer(Py_buffer *view, Py_ssize_t *indices) { char* pointer; int i; pointer = (char *)view->buf; for (i = 0; i < view->ndim; i++) { pointer += view->strides[i]*indices[i]; if ((view->suboffsets != NULL) && (view->suboffsets[i] >= 0)) { pointer = *((char**)pointer) + view->suboffsets[i]; } } return (void*)pointer; } void _add_one_to_index_F(int nd, Py_ssize_t *index, Py_ssize_t *shape) { int k; for (k=0; k=0; k--) { if (index[k] < shape[k]-1) { index[k]++; break; } else { index[k] = 0; } } } /* view is not checked for consistency in either of these. It is assumed that the size of the buffer is view->len in view->len / view->itemsize elements. */ int PyBuffer_ToContiguous(void *buf, Py_buffer *view, Py_ssize_t len, char fort) { int k; void (*addone)(int, Py_ssize_t *, Py_ssize_t *); Py_ssize_t *indices, elements; char *dest, *ptr; if (len > view->len) { len = view->len; } if (PyBuffer_IsContiguous(view, fort)) { /* simplest copy is all that is needed */ memcpy(buf, view->buf, len); return 0; } /* Otherwise a more elaborate scheme is needed */ /* XXX(nnorwitz): need to check for overflow! */ indices = (Py_ssize_t *)PyMem_Malloc(sizeof(Py_ssize_t)*(view->ndim)); if (indices == NULL) { PyErr_NoMemory(); return -1; } for (k=0; kndim;k++) { indices[k] = 0; } if (fort == 'F') { addone = _add_one_to_index_F; } else { addone = _add_one_to_index_C; } dest = buf; /* XXX : This is not going to be the fastest code in the world several optimizations are possible. */ elements = len / view->itemsize; while (elements--) { addone(view->ndim, indices, view->shape); ptr = PyBuffer_GetPointer(view, indices); memcpy(dest, ptr, view->itemsize); dest += view->itemsize; } PyMem_Free(indices); return 0; } int PyBuffer_FromContiguous(Py_buffer *view, void *buf, Py_ssize_t len, char fort) { int k; void (*addone)(int, Py_ssize_t *, Py_ssize_t *); Py_ssize_t *indices, elements; char *src, *ptr; if (len > view->len) { len = view->len; } if (PyBuffer_IsContiguous(view, fort)) { /* simplest copy is all that is needed */ memcpy(view->buf, buf, len); return 0; } /* Otherwise a more elaborate scheme is needed */ /* XXX(nnorwitz): need to check for overflow! */ indices = (Py_ssize_t *)PyMem_Malloc(sizeof(Py_ssize_t)*(view->ndim)); if (indices == NULL) { PyErr_NoMemory(); return -1; } for (k=0; kndim;k++) { indices[k] = 0; } if (fort == 'F') { addone = _add_one_to_index_F; } else { addone = _add_one_to_index_C; } src = buf; /* XXX : This is not going to be the fastest code in the world several optimizations are possible. */ elements = len / view->itemsize; while (elements--) { addone(view->ndim, indices, view->shape); ptr = PyBuffer_GetPointer(view, indices); memcpy(ptr, src, view->itemsize); src += view->itemsize; } PyMem_Free(indices); return 0; } int PyObject_CopyData(PyObject *dest, PyObject *src) { Py_buffer view_dest, view_src; int k; Py_ssize_t *indices, elements; char *dptr, *sptr; if (!PyObject_CheckBuffer(dest) || !PyObject_CheckBuffer(src)) { PyErr_SetString(PyExc_TypeError, "both destination and source must have the "\ "buffer interface"); return -1; } if (PyObject_GetBuffer(dest, &view_dest, PyBUF_FULL) != 0) return -1; if (PyObject_GetBuffer(src, &view_src, PyBUF_FULL_RO) != 0) { PyBuffer_Release(&view_dest); return -1; } if (view_dest.len < view_src.len) { PyErr_SetString(PyExc_BufferError, "destination is too small to receive data from source"); PyBuffer_Release(&view_dest); PyBuffer_Release(&view_src); return -1; } if ((PyBuffer_IsContiguous(&view_dest, 'C') && PyBuffer_IsContiguous(&view_src, 'C')) || (PyBuffer_IsContiguous(&view_dest, 'F') && PyBuffer_IsContiguous(&view_src, 'F'))) { /* simplest copy is all that is needed */ memcpy(view_dest.buf, view_src.buf, view_src.len); PyBuffer_Release(&view_dest); PyBuffer_Release(&view_src); return 0; } /* Otherwise a more elaborate copy scheme is needed */ /* XXX(nnorwitz): need to check for overflow! */ indices = (Py_ssize_t *)PyMem_Malloc(sizeof(Py_ssize_t)*view_src.ndim); if (indices == NULL) { PyErr_NoMemory(); PyBuffer_Release(&view_dest); PyBuffer_Release(&view_src); return -1; } for (k=0; k=0; k--) { strides[k] = sd; sd *= shape[k]; } } return; } int PyBuffer_FillInfo(Py_buffer *view, PyObject *obj, void *buf, Py_ssize_t len, int readonly, int flags) { if (view == NULL) return 0; if (((flags & PyBUF_WRITABLE) == PyBUF_WRITABLE) && (readonly == 1)) { PyErr_SetString(PyExc_BufferError, "Object is not writable."); return -1; } view->obj = obj; if (obj) Py_INCREF(obj); view->buf = buf; view->len = len; view->readonly = readonly; view->itemsize = 1; view->format = NULL; if ((flags & PyBUF_FORMAT) == PyBUF_FORMAT) view->format = "B"; view->ndim = 1; view->shape = NULL; if ((flags & PyBUF_ND) == PyBUF_ND) view->shape = &(view->len); view->strides = NULL; if ((flags & PyBUF_STRIDES) == PyBUF_STRIDES) view->strides = &(view->itemsize); view->suboffsets = NULL; view->internal = NULL; return 0; } void PyBuffer_Release(Py_buffer *view) { PyObject *obj = view->obj; if (obj && Py_TYPE(obj)->tp_as_buffer && Py_TYPE(obj)->tp_as_buffer->bf_releasebuffer) Py_TYPE(obj)->tp_as_buffer->bf_releasebuffer(obj, view); Py_XDECREF(obj); view->obj = NULL; } PyObject * PyObject_Format(PyObject *obj, PyObject *format_spec) { static PyObject * str__format__ = NULL; PyObject *meth; PyObject *empty = NULL; PyObject *result = NULL; /* Initialize cached value */ if (str__format__ == NULL) { /* Initialize static variable needed by _PyType_Lookup */ str__format__ = PyUnicode_FromString("__format__"); if (str__format__ == NULL) goto done; } /* If no format_spec is provided, use an empty string */ if (format_spec == NULL) { empty = PyUnicode_FromUnicode(NULL, 0); format_spec = empty; } /* Make sure the type is initialized. float gets initialized late */ if (Py_TYPE(obj)->tp_dict == NULL) if (PyType_Ready(Py_TYPE(obj)) < 0) goto done; /* Find the (unbound!) __format__ method (a borrowed reference) */ meth = _PyType_Lookup(Py_TYPE(obj), str__format__); if (meth == NULL) { PyErr_Format(PyExc_TypeError, "Type %.100s doesn't define __format__", Py_TYPE(obj)->tp_name); goto done; } /* And call it, binding it to the value */ result = PyObject_CallFunctionObjArgs(meth, obj, format_spec, NULL); if (result && !PyUnicode_Check(result)) { PyErr_SetString(PyExc_TypeError, "__format__ method did not return string"); Py_DECREF(result); result = NULL; goto done; } done: Py_XDECREF(empty); return result; } /* Operations on numbers */ int PyNumber_Check(PyObject *o) { return o && o->ob_type->tp_as_number && (o->ob_type->tp_as_number->nb_int || o->ob_type->tp_as_number->nb_float); } /* Binary operators */ #define NB_SLOT(x) offsetof(PyNumberMethods, x) #define NB_BINOP(nb_methods, slot) \ (*(binaryfunc*)(& ((char*)nb_methods)[slot])) #define NB_TERNOP(nb_methods, slot) \ (*(ternaryfunc*)(& ((char*)nb_methods)[slot])) /* Calling scheme used for binary operations: Order operations are tried until either a valid result or error: w.op(v,w)[*], v.op(v,w), w.op(v,w) [*] only when v->ob_type != w->ob_type && w->ob_type is a subclass of v->ob_type */ static PyObject * binary_op1(PyObject *v, PyObject *w, const int op_slot) { PyObject *x; binaryfunc slotv = NULL; binaryfunc slotw = NULL; if (v->ob_type->tp_as_number != NULL) slotv = NB_BINOP(v->ob_type->tp_as_number, op_slot); if (w->ob_type != v->ob_type && w->ob_type->tp_as_number != NULL) { slotw = NB_BINOP(w->ob_type->tp_as_number, op_slot); if (slotw == slotv) slotw = NULL; } if (slotv) { if (slotw && PyType_IsSubtype(w->ob_type, v->ob_type)) { x = slotw(v, w); if (x != Py_NotImplemented) return x; Py_DECREF(x); /* can't do it */ slotw = NULL; } x = slotv(v, w); if (x != Py_NotImplemented) return x; Py_DECREF(x); /* can't do it */ } if (slotw) { x = slotw(v, w); if (x != Py_NotImplemented) return x; Py_DECREF(x); /* can't do it */ } Py_INCREF(Py_NotImplemented); return Py_NotImplemented; } static PyObject * binop_type_error(PyObject *v, PyObject *w, const char *op_name) { PyErr_Format(PyExc_TypeError, "unsupported operand type(s) for %.100s: " "'%.100s' and '%.100s'", op_name, v->ob_type->tp_name, w->ob_type->tp_name); return NULL; } static PyObject * binary_op(PyObject *v, PyObject *w, const int op_slot, const char *op_name) { PyObject *result = binary_op1(v, w, op_slot); if (result == Py_NotImplemented) { Py_DECREF(result); return binop_type_error(v, w, op_name); } return result; } /* Calling scheme used for ternary operations: Order operations are tried until either a valid result or error: v.op(v,w,z), w.op(v,w,z), z.op(v,w,z) */ static PyObject * ternary_op(PyObject *v, PyObject *w, PyObject *z, const int op_slot, const char *op_name) { PyNumberMethods *mv, *mw, *mz; PyObject *x = NULL; ternaryfunc slotv = NULL; ternaryfunc slotw = NULL; ternaryfunc slotz = NULL; mv = v->ob_type->tp_as_number; mw = w->ob_type->tp_as_number; if (mv != NULL) slotv = NB_TERNOP(mv, op_slot); if (w->ob_type != v->ob_type && mw != NULL) { slotw = NB_TERNOP(mw, op_slot); if (slotw == slotv) slotw = NULL; } if (slotv) { if (slotw && PyType_IsSubtype(w->ob_type, v->ob_type)) { x = slotw(v, w, z); if (x != Py_NotImplemented) return x; Py_DECREF(x); /* can't do it */ slotw = NULL; } x = slotv(v, w, z); if (x != Py_NotImplemented) return x; Py_DECREF(x); /* can't do it */ } if (slotw) { x = slotw(v, w, z); if (x != Py_NotImplemented) return x; Py_DECREF(x); /* can't do it */ } mz = z->ob_type->tp_as_number; if (mz != NULL) { slotz = NB_TERNOP(mz, op_slot); if (slotz == slotv || slotz == slotw) slotz = NULL; if (slotz) { x = slotz(v, w, z); if (x != Py_NotImplemented) return x; Py_DECREF(x); /* can't do it */ } } if (z == Py_None) PyErr_Format( PyExc_TypeError, "unsupported operand type(s) for ** or pow(): " "'%.100s' and '%.100s'", v->ob_type->tp_name, w->ob_type->tp_name); else PyErr_Format( PyExc_TypeError, "unsupported operand type(s) for pow(): " "'%.100s', '%.100s', '%.100s'", v->ob_type->tp_name, w->ob_type->tp_name, z->ob_type->tp_name); return NULL; } #define BINARY_FUNC(func, op, op_name) \ PyObject * \ func(PyObject *v, PyObject *w) { \ return binary_op(v, w, NB_SLOT(op), op_name); \ } BINARY_FUNC(PyNumber_Or, nb_or, "|") BINARY_FUNC(PyNumber_Xor, nb_xor, "^") BINARY_FUNC(PyNumber_And, nb_and, "&") BINARY_FUNC(PyNumber_Lshift, nb_lshift, "<<") BINARY_FUNC(PyNumber_Rshift, nb_rshift, ">>") BINARY_FUNC(PyNumber_Subtract, nb_subtract, "-") BINARY_FUNC(PyNumber_Divmod, nb_divmod, "divmod()") PyObject * PyNumber_Add(PyObject *v, PyObject *w) { PyObject *result = binary_op1(v, w, NB_SLOT(nb_add)); if (result == Py_NotImplemented) { PySequenceMethods *m = v->ob_type->tp_as_sequence; Py_DECREF(result); if (m && m->sq_concat) { return (*m->sq_concat)(v, w); } result = binop_type_error(v, w, "+"); } return result; } static PyObject * sequence_repeat(ssizeargfunc repeatfunc, PyObject *seq, PyObject *n) { Py_ssize_t count; if (PyIndex_Check(n)) { count = PyNumber_AsSsize_t(n, PyExc_OverflowError); if (count == -1 && PyErr_Occurred()) return NULL; } else { return type_error("can't multiply sequence by " "non-int of type '%.200s'", n); } return (*repeatfunc)(seq, count); } PyObject * PyNumber_Multiply(PyObject *v, PyObject *w) { PyObject *result = binary_op1(v, w, NB_SLOT(nb_multiply)); if (result == Py_NotImplemented) { PySequenceMethods *mv = v->ob_type->tp_as_sequence; PySequenceMethods *mw = w->ob_type->tp_as_sequence; Py_DECREF(result); if (mv && mv->sq_repeat) { return sequence_repeat(mv->sq_repeat, v, w); } else if (mw && mw->sq_repeat) { return sequence_repeat(mw->sq_repeat, w, v); } result = binop_type_error(v, w, "*"); } return result; } PyObject * PyNumber_FloorDivide(PyObject *v, PyObject *w) { return binary_op(v, w, NB_SLOT(nb_floor_divide), "//"); } PyObject * PyNumber_TrueDivide(PyObject *v, PyObject *w) { return binary_op(v, w, NB_SLOT(nb_true_divide), "/"); } PyObject * PyNumber_Remainder(PyObject *v, PyObject *w) { return binary_op(v, w, NB_SLOT(nb_remainder), "%"); } PyObject * PyNumber_Power(PyObject *v, PyObject *w, PyObject *z) { return ternary_op(v, w, z, NB_SLOT(nb_power), "** or pow()"); } /* Binary in-place operators */ /* The in-place operators are defined to fall back to the 'normal', non in-place operations, if the in-place methods are not in place. - If the left hand object has the appropriate struct members, and they are filled, call the appropriate function and return the result. No coercion is done on the arguments; the left-hand object is the one the operation is performed on, and it's up to the function to deal with the right-hand object. - Otherwise, in-place modification is not supported. Handle it exactly as a non in-place operation of the same kind. */ static PyObject * binary_iop1(PyObject *v, PyObject *w, const int iop_slot, const int op_slot) { PyNumberMethods *mv = v->ob_type->tp_as_number; if (mv != NULL) { binaryfunc slot = NB_BINOP(mv, iop_slot); if (slot) { PyObject *x = (slot)(v, w); if (x != Py_NotImplemented) { return x; } Py_DECREF(x); } } return binary_op1(v, w, op_slot); } static PyObject * binary_iop(PyObject *v, PyObject *w, const int iop_slot, const int op_slot, const char *op_name) { PyObject *result = binary_iop1(v, w, iop_slot, op_slot); if (result == Py_NotImplemented) { Py_DECREF(result); return binop_type_error(v, w, op_name); } return result; } #define INPLACE_BINOP(func, iop, op, op_name) \ PyObject * \ func(PyObject *v, PyObject *w) { \ return binary_iop(v, w, NB_SLOT(iop), NB_SLOT(op), op_name); \ } INPLACE_BINOP(PyNumber_InPlaceOr, nb_inplace_or, nb_or, "|=") INPLACE_BINOP(PyNumber_InPlaceXor, nb_inplace_xor, nb_xor, "^=") INPLACE_BINOP(PyNumber_InPlaceAnd, nb_inplace_and, nb_and, "&=") INPLACE_BINOP(PyNumber_InPlaceLshift, nb_inplace_lshift, nb_lshift, "<<=") INPLACE_BINOP(PyNumber_InPlaceRshift, nb_inplace_rshift, nb_rshift, ">>=") INPLACE_BINOP(PyNumber_InPlaceSubtract, nb_inplace_subtract, nb_subtract, "-=") PyObject * PyNumber_InPlaceFloorDivide(PyObject *v, PyObject *w) { return binary_iop(v, w, NB_SLOT(nb_inplace_floor_divide), NB_SLOT(nb_floor_divide), "//="); } PyObject * PyNumber_InPlaceTrueDivide(PyObject *v, PyObject *w) { return binary_iop(v, w, NB_SLOT(nb_inplace_true_divide), NB_SLOT(nb_true_divide), "/="); } PyObject * PyNumber_InPlaceAdd(PyObject *v, PyObject *w) { PyObject *result = binary_iop1(v, w, NB_SLOT(nb_inplace_add), NB_SLOT(nb_add)); if (result == Py_NotImplemented) { PySequenceMethods *m = v->ob_type->tp_as_sequence; Py_DECREF(result); if (m != NULL) { binaryfunc f = NULL; f = m->sq_inplace_concat; if (f == NULL) f = m->sq_concat; if (f != NULL) return (*f)(v, w); } result = binop_type_error(v, w, "+="); } return result; } PyObject * PyNumber_InPlaceMultiply(PyObject *v, PyObject *w) { PyObject *result = binary_iop1(v, w, NB_SLOT(nb_inplace_multiply), NB_SLOT(nb_multiply)); if (result == Py_NotImplemented) { ssizeargfunc f = NULL; PySequenceMethods *mv = v->ob_type->tp_as_sequence; PySequenceMethods *mw = w->ob_type->tp_as_sequence; Py_DECREF(result); if (mv != NULL) { f = mv->sq_inplace_repeat; if (f == NULL) f = mv->sq_repeat; if (f != NULL) return sequence_repeat(f, v, w); } else if (mw != NULL) { /* Note that the right hand operand should not be * mutated in this case so sq_inplace_repeat is not * used. */ if (mw->sq_repeat) return sequence_repeat(mw->sq_repeat, w, v); } result = binop_type_error(v, w, "*="); } return result; } PyObject * PyNumber_InPlaceRemainder(PyObject *v, PyObject *w) { return binary_iop(v, w, NB_SLOT(nb_inplace_remainder), NB_SLOT(nb_remainder), "%="); } PyObject * PyNumber_InPlacePower(PyObject *v, PyObject *w, PyObject *z) { if (v->ob_type->tp_as_number && v->ob_type->tp_as_number->nb_inplace_power != NULL) { return ternary_op(v, w, z, NB_SLOT(nb_inplace_power), "**="); } else { return ternary_op(v, w, z, NB_SLOT(nb_power), "**="); } } /* Unary operators and functions */ PyObject * PyNumber_Negative(PyObject *o) { PyNumberMethods *m; if (o == NULL) return null_error(); m = o->ob_type->tp_as_number; if (m && m->nb_negative) return (*m->nb_negative)(o); return type_error("bad operand type for unary -: '%.200s'", o); } PyObject * PyNumber_Positive(PyObject *o) { PyNumberMethods *m; if (o == NULL) return null_error(); m = o->ob_type->tp_as_number; if (m && m->nb_positive) return (*m->nb_positive)(o); return type_error("bad operand type for unary +: '%.200s'", o); } PyObject * PyNumber_Invert(PyObject *o) { PyNumberMethods *m; if (o == NULL) return null_error(); m = o->ob_type->tp_as_number; if (m && m->nb_invert) return (*m->nb_invert)(o); return type_error("bad operand type for unary ~: '%.200s'", o); } PyObject * PyNumber_Absolute(PyObject *o) { PyNumberMethods *m; if (o == NULL) return null_error(); m = o->ob_type->tp_as_number; if (m && m->nb_absolute) return m->nb_absolute(o); return type_error("bad operand type for abs(): '%.200s'", o); } /* Return a Python Int or Long from the object item Raise TypeError if the result is not an int-or-long or if the object cannot be interpreted as an index. */ PyObject * PyNumber_Index(PyObject *item) { PyObject *result = NULL; if (item == NULL) return null_error(); if (PyLong_Check(item)) { Py_INCREF(item); return item; } if (PyIndex_Check(item)) { result = item->ob_type->tp_as_number->nb_index(item); if (result && !PyLong_Check(result)) { PyErr_Format(PyExc_TypeError, "__index__ returned non-int " "(type %.200s)", result->ob_type->tp_name); Py_DECREF(result); return NULL; } } else { PyErr_Format(PyExc_TypeError, "'%.200s' object cannot be interpreted " "as an integer", item->ob_type->tp_name); } return result; } /* Return an error on Overflow only if err is not NULL*/ Py_ssize_t PyNumber_AsSsize_t(PyObject *item, PyObject *err) { Py_ssize_t result; PyObject *runerr; PyObject *value = PyNumber_Index(item); if (value == NULL) return -1; /* We're done if PyLong_AsSsize_t() returns without error. */ result = PyLong_AsSsize_t(value); if (result != -1 || !(runerr = PyErr_Occurred())) goto finish; /* Error handling code -- only manage OverflowError differently */ if (!PyErr_GivenExceptionMatches(runerr, PyExc_OverflowError)) goto finish; PyErr_Clear(); /* If no error-handling desired then the default clipping is sufficient. */ if (!err) { assert(PyLong_Check(value)); /* Whether or not it is less than or equal to zero is determined by the sign of ob_size */ if (_PyLong_Sign(value) < 0) result = PY_SSIZE_T_MIN; else result = PY_SSIZE_T_MAX; } else { /* Otherwise replace the error with caller's error object. */ PyErr_Format(err, "cannot fit '%.200s' into an index-sized integer", item->ob_type->tp_name); } finish: Py_DECREF(value); return result; } PyObject * _PyNumber_ConvertIntegralToInt(PyObject *integral, const char* error_format) { static PyObject *int_name = NULL; if (int_name == NULL) { int_name = PyUnicode_InternFromString("__int__"); if (int_name == NULL) return NULL; } if (integral && !PyLong_Check(integral)) { /* Don't go through tp_as_number->nb_int to avoid hitting the classic class fallback to __trunc__. */ PyObject *int_func = PyObject_GetAttr(integral, int_name); if (int_func == NULL) { PyErr_Clear(); /* Raise a different error. */ goto non_integral_error; } Py_DECREF(integral); integral = PyEval_CallObject(int_func, NULL); Py_DECREF(int_func); if (integral && !PyLong_Check(integral)) { goto non_integral_error; } } return integral; non_integral_error: PyErr_Format(PyExc_TypeError, error_format, Py_TYPE(integral)->tp_name); Py_DECREF(integral); return NULL; } /* Add a check for embedded NULL-bytes in the argument. */ static PyObject * long_from_string(const char *s, Py_ssize_t len) { char *end; PyObject *x; x = PyLong_FromString((char*)s, &end, 10); if (x == NULL) return NULL; if (end != s + len) { PyErr_SetString(PyExc_ValueError, "null byte in argument for int()"); Py_DECREF(x); return NULL; } return x; } PyObject * PyNumber_Long(PyObject *o) { PyNumberMethods *m; static PyObject *trunc_name = NULL; PyObject *trunc_func; const char *buffer; Py_ssize_t buffer_len; if (trunc_name == NULL) { trunc_name = PyUnicode_InternFromString("__trunc__"); if (trunc_name == NULL) return NULL; } if (o == NULL) return null_error(); if (PyLong_CheckExact(o)) { Py_INCREF(o); return o; } m = o->ob_type->tp_as_number; if (m && m->nb_int) { /* This should include subclasses of int */ PyObject *res = m->nb_int(o); if (res && !PyLong_Check(res)) { PyErr_Format(PyExc_TypeError, "__int__ returned non-int (type %.200s)", res->ob_type->tp_name); Py_DECREF(res); return NULL; } return res; } if (PyLong_Check(o)) /* An int subclass without nb_int */ return _PyLong_Copy((PyLongObject *)o); trunc_func = PyObject_GetAttr(o, trunc_name); if (trunc_func) { PyObject *truncated = PyEval_CallObject(trunc_func, NULL); PyObject *int_instance; Py_DECREF(trunc_func); /* __trunc__ is specified to return an Integral type, but long() needs to return a long. */ int_instance = _PyNumber_ConvertIntegralToInt( truncated, "__trunc__ returned non-Integral (type %.200s)"); return int_instance; } PyErr_Clear(); /* It's not an error if o.__trunc__ doesn't exist. */ if (PyBytes_Check(o)) /* need to do extra error checking that PyLong_FromString() * doesn't do. In particular long('9.5') must raise an * exception, not truncate the float. */ return long_from_string(PyBytes_AS_STRING(o), PyBytes_GET_SIZE(o)); if (PyUnicode_Check(o)) /* The above check is done in PyLong_FromUnicode(). */ return PyLong_FromUnicode(PyUnicode_AS_UNICODE(o), PyUnicode_GET_SIZE(o), 10); if (!PyObject_AsCharBuffer(o, &buffer, &buffer_len)) return long_from_string(buffer, buffer_len); return type_error("int() argument must be a string or a " "number, not '%.200s'", o); } PyObject * PyNumber_Float(PyObject *o) { PyNumberMethods *m; if (o == NULL) return null_error(); m = o->ob_type->tp_as_number; if (m && m->nb_float) { /* This should include subclasses of float */ PyObject *res = m->nb_float(o); if (res && !PyFloat_Check(res)) { PyErr_Format(PyExc_TypeError, "__float__ returned non-float (type %.200s)", res->ob_type->tp_name); Py_DECREF(res); return NULL; } return res; } if (PyFloat_Check(o)) { /* A float subclass with nb_float == NULL */ PyFloatObject *po = (PyFloatObject *)o; return PyFloat_FromDouble(po->ob_fval); } return PyFloat_FromString(o); } PyObject * PyNumber_ToBase(PyObject *n, int base) { PyObject *res = NULL; PyObject *index = PyNumber_Index(n); if (!index) return NULL; if (PyLong_Check(index)) res = _PyLong_Format(index, base); else /* It should not be possible to get here, as PyNumber_Index already has a check for the same condition */ PyErr_SetString(PyExc_ValueError, "PyNumber_ToBase: index not " "int or long"); Py_DECREF(index); return res; } /* Operations on sequences */ int PySequence_Check(PyObject *s) { if (PyObject_IsInstance(s, (PyObject *)&PyDict_Type)) return 0; return s != NULL && s->ob_type->tp_as_sequence && s->ob_type->tp_as_sequence->sq_item != NULL; } Py_ssize_t PySequence_Size(PyObject *s) { PySequenceMethods *m; if (s == NULL) { null_error(); return -1; } m = s->ob_type->tp_as_sequence; if (m && m->sq_length) return m->sq_length(s); type_error("object of type '%.200s' has no len()", s); return -1; } #undef PySequence_Length Py_ssize_t PySequence_Length(PyObject *s) { return PySequence_Size(s); } #define PySequence_Length PySequence_Size PyObject * PySequence_Concat(PyObject *s, PyObject *o) { PySequenceMethods *m; if (s == NULL || o == NULL) return null_error(); m = s->ob_type->tp_as_sequence; if (m && m->sq_concat) return m->sq_concat(s, o); /* Instances of user classes defining an __add__() method only have an nb_add slot, not an sq_concat slot. So we fall back to nb_add if both arguments appear to be sequences. */ if (PySequence_Check(s) && PySequence_Check(o)) { PyObject *result = binary_op1(s, o, NB_SLOT(nb_add)); if (result != Py_NotImplemented) return result; Py_DECREF(result); } return type_error("'%.200s' object can't be concatenated", s); } PyObject * PySequence_Repeat(PyObject *o, Py_ssize_t count) { PySequenceMethods *m; if (o == NULL) return null_error(); m = o->ob_type->tp_as_sequence; if (m && m->sq_repeat) return m->sq_repeat(o, count); /* Instances of user classes defining a __mul__() method only have an nb_multiply slot, not an sq_repeat slot. so we fall back to nb_multiply if o appears to be a sequence. */ if (PySequence_Check(o)) { PyObject *n, *result; n = PyLong_FromSsize_t(count); if (n == NULL) return NULL; result = binary_op1(o, n, NB_SLOT(nb_multiply)); Py_DECREF(n); if (result != Py_NotImplemented) return result; Py_DECREF(result); } return type_error("'%.200s' object can't be repeated", o); } PyObject * PySequence_InPlaceConcat(PyObject *s, PyObject *o) { PySequenceMethods *m; if (s == NULL || o == NULL) return null_error(); m = s->ob_type->tp_as_sequence; if (m && m->sq_inplace_concat) return m->sq_inplace_concat(s, o); if (m && m->sq_concat) return m->sq_concat(s, o); if (PySequence_Check(s) && PySequence_Check(o)) { PyObject *result = binary_iop1(s, o, NB_SLOT(nb_inplace_add), NB_SLOT(nb_add)); if (result != Py_NotImplemented) return result; Py_DECREF(result); } return type_error("'%.200s' object can't be concatenated", s); } PyObject * PySequence_InPlaceRepeat(PyObject *o, Py_ssize_t count) { PySequenceMethods *m; if (o == NULL) return null_error(); m = o->ob_type->tp_as_sequence; if (m && m->sq_inplace_repeat) return m->sq_inplace_repeat(o, count); if (m && m->sq_repeat) return m->sq_repeat(o, count); if (PySequence_Check(o)) { PyObject *n, *result; n = PyLong_FromSsize_t(count); if (n == NULL) return NULL; result = binary_iop1(o, n, NB_SLOT(nb_inplace_multiply), NB_SLOT(nb_multiply)); Py_DECREF(n); if (result != Py_NotImplemented) return result; Py_DECREF(result); } return type_error("'%.200s' object can't be repeated", o); } PyObject * PySequence_GetItem(PyObject *s, Py_ssize_t i) { PySequenceMethods *m; if (s == NULL) return null_error(); m = s->ob_type->tp_as_sequence; if (m && m->sq_item) { if (i < 0) { if (m->sq_length) { Py_ssize_t l = (*m->sq_length)(s); if (l < 0) return NULL; i += l; } } return m->sq_item(s, i); } return type_error("'%.200s' object does not support indexing", s); } PyObject * PySequence_GetSlice(PyObject *s, Py_ssize_t i1, Py_ssize_t i2) { PyMappingMethods *mp; if (!s) return null_error(); mp = s->ob_type->tp_as_mapping; if (mp->mp_subscript) { PyObject *res; PyObject *slice = _PySlice_FromIndices(i1, i2); if (!slice) return NULL; res = mp->mp_subscript(s, slice); Py_DECREF(slice); return res; } return type_error("'%.200s' object is unsliceable", s); } int PySequence_SetItem(PyObject *s, Py_ssize_t i, PyObject *o) { PySequenceMethods *m; if (s == NULL) { null_error(); return -1; } m = s->ob_type->tp_as_sequence; if (m && m->sq_ass_item) { if (i < 0) { if (m->sq_length) { Py_ssize_t l = (*m->sq_length)(s); if (l < 0) return -1; i += l; } } return m->sq_ass_item(s, i, o); } type_error("'%.200s' object does not support item assignment", s); return -1; } int PySequence_DelItem(PyObject *s, Py_ssize_t i) { PySequenceMethods *m; if (s == NULL) { null_error(); return -1; } m = s->ob_type->tp_as_sequence; if (m && m->sq_ass_item) { if (i < 0) { if (m->sq_length) { Py_ssize_t l = (*m->sq_length)(s); if (l < 0) return -1; i += l; } } return m->sq_ass_item(s, i, (PyObject *)NULL); } type_error("'%.200s' object doesn't support item deletion", s); return -1; } int PySequence_SetSlice(PyObject *s, Py_ssize_t i1, Py_ssize_t i2, PyObject *o) { PyMappingMethods *mp; if (s == NULL) { null_error(); return -1; } mp = s->ob_type->tp_as_mapping; if (mp->mp_ass_subscript) { int res; PyObject *slice = _PySlice_FromIndices(i1, i2); if (!slice) return -1; res = mp->mp_ass_subscript(s, slice, o); Py_DECREF(slice); return res; } type_error("'%.200s' object doesn't support slice assignment", s); return -1; } int PySequence_DelSlice(PyObject *s, Py_ssize_t i1, Py_ssize_t i2) { PyMappingMethods *mp; if (s == NULL) { null_error(); return -1; } mp = s->ob_type->tp_as_mapping; if (mp->mp_ass_subscript) { int res; PyObject *slice = _PySlice_FromIndices(i1, i2); if (!slice) return -1; res = mp->mp_ass_subscript(s, slice, NULL); Py_DECREF(slice); return res; } type_error("'%.200s' object doesn't support slice deletion", s); return -1; } PyObject * PySequence_Tuple(PyObject *v) { PyObject *it; /* iter(v) */ Py_ssize_t n; /* guess for result tuple size */ PyObject *result; Py_ssize_t j; if (v == NULL) return null_error(); /* Special-case the common tuple and list cases, for efficiency. */ if (PyTuple_CheckExact(v)) { /* Note that we can't know whether it's safe to return a tuple *subclass* instance as-is, hence the restriction to exact tuples here. In contrast, lists always make a copy, so there's no need for exactness below. */ Py_INCREF(v); return v; } if (PyList_Check(v)) return PyList_AsTuple(v); /* Get iterator. */ it = PyObject_GetIter(v); if (it == NULL) return NULL; /* Guess result size and allocate space. */ n = _PyObject_LengthHint(v, 10); result = PyTuple_New(n); if (result == NULL) goto Fail; /* Fill the tuple. */ for (j = 0; ; ++j) { PyObject *item = PyIter_Next(it); if (item == NULL) { if (PyErr_Occurred()) goto Fail; break; } if (j >= n) { Py_ssize_t oldn = n; /* The over-allocation strategy can grow a bit faster than for lists because unlike lists the over-allocation isn't permanent -- we reclaim the excess before the end of this routine. So, grow by ten and then add 25%. */ n += 10; n += n >> 2; if (n < oldn) { /* Check for overflow */ PyErr_NoMemory(); Py_DECREF(item); goto Fail; } if (_PyTuple_Resize(&result, n) != 0) { Py_DECREF(item); goto Fail; } } PyTuple_SET_ITEM(result, j, item); } /* Cut tuple back if guess was too large. */ if (j < n && _PyTuple_Resize(&result, j) != 0) goto Fail; Py_DECREF(it); return result; Fail: Py_XDECREF(result); Py_DECREF(it); return NULL; } PyObject * PySequence_List(PyObject *v) { PyObject *result; /* result list */ PyObject *rv; /* return value from PyList_Extend */ if (v == NULL) return null_error(); result = PyList_New(0); if (result == NULL) return NULL; rv = _PyList_Extend((PyListObject *)result, v); if (rv == NULL) { Py_DECREF(result); return NULL; } Py_DECREF(rv); return result; } PyObject * PySequence_Fast(PyObject *v, const char *m) { PyObject *it; if (v == NULL) return null_error(); if (PyList_CheckExact(v) || PyTuple_CheckExact(v)) { Py_INCREF(v); return v; } it = PyObject_GetIter(v); if (it == NULL) { if (PyErr_ExceptionMatches(PyExc_TypeError)) PyErr_SetString(PyExc_TypeError, m); return NULL; } v = PySequence_List(it); Py_DECREF(it); return v; } /* Iterate over seq. Result depends on the operation: PY_ITERSEARCH_COUNT: -1 if error, else # of times obj appears in seq. PY_ITERSEARCH_INDEX: 0-based index of first occurence of obj in seq; set ValueError and return -1 if none found; also return -1 on error. Py_ITERSEARCH_CONTAINS: return 1 if obj in seq, else 0; -1 on error. */ Py_ssize_t _PySequence_IterSearch(PyObject *seq, PyObject *obj, int operation) { Py_ssize_t n; int wrapped; /* for PY_ITERSEARCH_INDEX, true iff n wrapped around */ PyObject *it; /* iter(seq) */ if (seq == NULL || obj == NULL) { null_error(); return -1; } it = PyObject_GetIter(seq); if (it == NULL) { type_error("argument of type '%.200s' is not iterable", seq); return -1; } n = wrapped = 0; for (;;) { int cmp; PyObject *item = PyIter_Next(it); if (item == NULL) { if (PyErr_Occurred()) goto Fail; break; } cmp = PyObject_RichCompareBool(obj, item, Py_EQ); Py_DECREF(item); if (cmp < 0) goto Fail; if (cmp > 0) { switch (operation) { case PY_ITERSEARCH_COUNT: if (n == PY_SSIZE_T_MAX) { PyErr_SetString(PyExc_OverflowError, "count exceeds C integer size"); goto Fail; } ++n; break; case PY_ITERSEARCH_INDEX: if (wrapped) { PyErr_SetString(PyExc_OverflowError, "index exceeds C integer size"); goto Fail; } goto Done; case PY_ITERSEARCH_CONTAINS: n = 1; goto Done; default: assert(!"unknown operation"); } } if (operation == PY_ITERSEARCH_INDEX) { if (n == PY_SSIZE_T_MAX) wrapped = 1; ++n; } } if (operation != PY_ITERSEARCH_INDEX) goto Done; PyErr_SetString(PyExc_ValueError, "sequence.index(x): x not in sequence"); /* fall into failure code */ Fail: n = -1; /* fall through */ Done: Py_DECREF(it); return n; } /* Return # of times o appears in s. */ Py_ssize_t PySequence_Count(PyObject *s, PyObject *o) { return _PySequence_IterSearch(s, o, PY_ITERSEARCH_COUNT); } /* Return -1 if error; 1 if ob in seq; 0 if ob not in seq. * Use sq_contains if possible, else defer to _PySequence_IterSearch(). */ int PySequence_Contains(PyObject *seq, PyObject *ob) { Py_ssize_t result; PySequenceMethods *sqm = seq->ob_type->tp_as_sequence; if (sqm != NULL && sqm->sq_contains != NULL) return (*sqm->sq_contains)(seq, ob); result = _PySequence_IterSearch(seq, ob, PY_ITERSEARCH_CONTAINS); return Py_SAFE_DOWNCAST(result, Py_ssize_t, int); } /* Backwards compatibility */ #undef PySequence_In int PySequence_In(PyObject *w, PyObject *v) { return PySequence_Contains(w, v); } Py_ssize_t PySequence_Index(PyObject *s, PyObject *o) { return _PySequence_IterSearch(s, o, PY_ITERSEARCH_INDEX); } /* Operations on mappings */ int PyMapping_Check(PyObject *o) { return o && o->ob_type->tp_as_mapping && o->ob_type->tp_as_mapping->mp_subscript; } Py_ssize_t PyMapping_Size(PyObject *o) { PyMappingMethods *m; if (o == NULL) { null_error(); return -1; } m = o->ob_type->tp_as_mapping; if (m && m->mp_length) return m->mp_length(o); type_error("object of type '%.200s' has no len()", o); return -1; } #undef PyMapping_Length Py_ssize_t PyMapping_Length(PyObject *o) { return PyMapping_Size(o); } #define PyMapping_Length PyMapping_Size PyObject * PyMapping_GetItemString(PyObject *o, char *key) { PyObject *okey, *r; if (key == NULL) return null_error(); okey = PyUnicode_FromString(key); if (okey == NULL) return NULL; r = PyObject_GetItem(o, okey); Py_DECREF(okey); return r; } int PyMapping_SetItemString(PyObject *o, char *key, PyObject *value) { PyObject *okey; int r; if (key == NULL) { null_error(); return -1; } okey = PyUnicode_FromString(key); if (okey == NULL) return -1; r = PyObject_SetItem(o, okey, value); Py_DECREF(okey); return r; } int PyMapping_HasKeyString(PyObject *o, char *key) { PyObject *v; v = PyMapping_GetItemString(o, key); if (v) { Py_DECREF(v); return 1; } PyErr_Clear(); return 0; } int PyMapping_HasKey(PyObject *o, PyObject *key) { PyObject *v; v = PyObject_GetItem(o, key); if (v) { Py_DECREF(v); return 1; } PyErr_Clear(); return 0; } PyObject * PyMapping_Keys(PyObject *o) { PyObject *keys; PyObject *fast; if (PyDict_CheckExact(o)) return PyDict_Keys(o); keys = PyObject_CallMethod(o, "keys", NULL); if (keys == NULL) return NULL; fast = PySequence_Fast(keys, "o.keys() are not iterable"); Py_DECREF(keys); return fast; } PyObject * PyMapping_Items(PyObject *o) { PyObject *items; PyObject *fast; if (PyDict_CheckExact(o)) return PyDict_Items(o); items = PyObject_CallMethod(o, "items", NULL); if (items == NULL) return NULL; fast = PySequence_Fast(items, "o.items() are not iterable"); Py_DECREF(items); return fast; } PyObject * PyMapping_Values(PyObject *o) { PyObject *values; PyObject *fast; if (PyDict_CheckExact(o)) return PyDict_Values(o); values = PyObject_CallMethod(o, "values", NULL); if (values == NULL) return NULL; fast = PySequence_Fast(values, "o.values() are not iterable"); Py_DECREF(values); return fast; } /* Operations on callable objects */ /* XXX PyCallable_Check() is in object.c */ PyObject * PyObject_CallObject(PyObject *o, PyObject *a) { return PyEval_CallObjectWithKeywords(o, a, NULL); } PyObject * PyObject_Call(PyObject *func, PyObject *arg, PyObject *kw) { ternaryfunc call; if ((call = func->ob_type->tp_call) != NULL) { PyObject *result; if (Py_EnterRecursiveCall(" while calling a Python object")) return NULL; result = (*call)(func, arg, kw); Py_LeaveRecursiveCall(); if (result == NULL && !PyErr_Occurred()) PyErr_SetString( PyExc_SystemError, "NULL result without error in PyObject_Call"); return result; } PyErr_Format(PyExc_TypeError, "'%.200s' object is not callable", func->ob_type->tp_name); return NULL; } static PyObject* call_function_tail(PyObject *callable, PyObject *args) { PyObject *retval; if (args == NULL) return NULL; if (!PyTuple_Check(args)) { PyObject *a; a = PyTuple_New(1); if (a == NULL) { Py_DECREF(args); return NULL; } PyTuple_SET_ITEM(a, 0, args); args = a; } retval = PyObject_Call(callable, args, NULL); Py_DECREF(args); return retval; } PyObject * PyObject_CallFunction(PyObject *callable, char *format, ...) { va_list va; PyObject *args; if (callable == NULL) return null_error(); if (format && *format) { va_start(va, format); args = Py_VaBuildValue(format, va); va_end(va); } else args = PyTuple_New(0); return call_function_tail(callable, args); } PyObject * _PyObject_CallFunction_SizeT(PyObject *callable, char *format, ...) { va_list va; PyObject *args; if (callable == NULL) return null_error(); if (format && *format) { va_start(va, format); args = _Py_VaBuildValue_SizeT(format, va); va_end(va); } else args = PyTuple_New(0); return call_function_tail(callable, args); } PyObject * PyObject_CallMethod(PyObject *o, char *name, char *format, ...) { va_list va; PyObject *args; PyObject *func = NULL; PyObject *retval = NULL; if (o == NULL || name == NULL) return null_error(); func = PyObject_GetAttrString(o, name); if (func == NULL) { PyErr_SetString(PyExc_AttributeError, name); return 0; } if (!PyCallable_Check(func)) { type_error("attribute of type '%.200s' is not callable", func); goto exit; } if (format && *format) { va_start(va, format); args = Py_VaBuildValue(format, va); va_end(va); } else args = PyTuple_New(0); retval = call_function_tail(func, args); exit: /* args gets consumed in call_function_tail */ Py_XDECREF(func); return retval; } PyObject * _PyObject_CallMethod_SizeT(PyObject *o, char *name, char *format, ...) { va_list va; PyObject *args; PyObject *func = NULL; PyObject *retval = NULL; if (o == NULL || name == NULL) return null_error(); func = PyObject_GetAttrString(o, name); if (func == NULL) { PyErr_SetString(PyExc_AttributeError, name); return 0; } if (!PyCallable_Check(func)) { type_error("attribute of type '%.200s' is not callable", func); goto exit; } if (format && *format) { va_start(va, format); args = _Py_VaBuildValue_SizeT(format, va); va_end(va); } else args = PyTuple_New(0); retval = call_function_tail(func, args); exit: /* args gets consumed in call_function_tail */ Py_XDECREF(func); return retval; } static PyObject * objargs_mktuple(va_list va) { int i, n = 0; va_list countva; PyObject *result, *tmp; #ifdef VA_LIST_IS_ARRAY memcpy(countva, va, sizeof(va_list)); #else #ifdef __va_copy __va_copy(countva, va); #else countva = va; #endif #endif while (((PyObject *)va_arg(countva, PyObject *)) != NULL) ++n; result = PyTuple_New(n); if (result != NULL && n > 0) { for (i = 0; i < n; ++i) { tmp = (PyObject *)va_arg(va, PyObject *); PyTuple_SET_ITEM(result, i, tmp); Py_INCREF(tmp); } } return result; } PyObject * PyObject_CallMethodObjArgs(PyObject *callable, PyObject *name, ...) { PyObject *args, *tmp; va_list vargs; if (callable == NULL || name == NULL) return null_error(); callable = PyObject_GetAttr(callable, name); if (callable == NULL) return NULL; /* count the args */ va_start(vargs, name); args = objargs_mktuple(vargs); va_end(vargs); if (args == NULL) { Py_DECREF(callable); return NULL; } tmp = PyObject_Call(callable, args, NULL); Py_DECREF(args); Py_DECREF(callable); return tmp; } PyObject * PyObject_CallFunctionObjArgs(PyObject *callable, ...) { PyObject *args, *tmp; va_list vargs; if (callable == NULL) return null_error(); /* count the args */ va_start(vargs, callable); args = objargs_mktuple(vargs); va_end(vargs); if (args == NULL) return NULL; tmp = PyObject_Call(callable, args, NULL); Py_DECREF(args); return tmp; } /* isinstance(), issubclass() */ /* abstract_get_bases() has logically 4 return states, with a sort of 0th * state that will almost never happen. * * 0. creating the __bases__ static string could get a MemoryError * 1. getattr(cls, '__bases__') could raise an AttributeError * 2. getattr(cls, '__bases__') could raise some other exception * 3. getattr(cls, '__bases__') could return a tuple * 4. getattr(cls, '__bases__') could return something other than a tuple * * Only state #3 is a non-error state and only it returns a non-NULL object * (it returns the retrieved tuple). * * Any raised AttributeErrors are masked by clearing the exception and * returning NULL. If an object other than a tuple comes out of __bases__, * then again, the return value is NULL. So yes, these two situations * produce exactly the same results: NULL is returned and no error is set. * * If some exception other than AttributeError is raised, then NULL is also * returned, but the exception is not cleared. That's because we want the * exception to be propagated along. * * Callers are expected to test for PyErr_Occurred() when the return value * is NULL to decide whether a valid exception should be propagated or not. * When there's no exception to propagate, it's customary for the caller to * set a TypeError. */ static PyObject * abstract_get_bases(PyObject *cls) { static PyObject *__bases__ = NULL; PyObject *bases; if (__bases__ == NULL) { __bases__ = PyUnicode_InternFromString("__bases__"); if (__bases__ == NULL) return NULL; } Py_ALLOW_RECURSION bases = PyObject_GetAttr(cls, __bases__); Py_END_ALLOW_RECURSION if (bases == NULL) { if (PyErr_ExceptionMatches(PyExc_AttributeError)) PyErr_Clear(); return NULL; } if (!PyTuple_Check(bases)) { Py_DECREF(bases); return NULL; } return bases; } static int abstract_issubclass(PyObject *derived, PyObject *cls) { PyObject *bases = NULL; Py_ssize_t i, n; int r = 0; while (1) { if (derived == cls) return 1; bases = abstract_get_bases(derived); if (bases == NULL) { if (PyErr_Occurred()) return -1; return 0; } n = PyTuple_GET_SIZE(bases); if (n == 0) { Py_DECREF(bases); return 0; } /* Avoid recursivity in the single inheritance case */ if (n == 1) { derived = PyTuple_GET_ITEM(bases, 0); Py_DECREF(bases); continue; } for (i = 0; i < n; i++) { r = abstract_issubclass(PyTuple_GET_ITEM(bases, i), cls); if (r != 0) break; } Py_DECREF(bases); return r; } } static int check_class(PyObject *cls, const char *error) { PyObject *bases = abstract_get_bases(cls); if (bases == NULL) { /* Do not mask errors. */ if (!PyErr_Occurred()) PyErr_SetString(PyExc_TypeError, error); return 0; } Py_DECREF(bases); return -1; } static int recursive_isinstance(PyObject *inst, PyObject *cls) { PyObject *icls; static PyObject *__class__ = NULL; int retval = 0; if (__class__ == NULL) { __class__ = PyUnicode_InternFromString("__class__"); if (__class__ == NULL) return -1; } if (PyType_Check(cls)) { retval = PyObject_TypeCheck(inst, (PyTypeObject *)cls); if (retval == 0) { PyObject *c = PyObject_GetAttr(inst, __class__); if (c == NULL) { PyErr_Clear(); } else { if (c != (PyObject *)(inst->ob_type) && PyType_Check(c)) retval = PyType_IsSubtype( (PyTypeObject *)c, (PyTypeObject *)cls); Py_DECREF(c); } } } else { if (!check_class(cls, "isinstance() arg 2 must be a class, type," " or tuple of classes and types")) return -1; icls = PyObject_GetAttr(inst, __class__); if (icls == NULL) { PyErr_Clear(); retval = 0; } else { retval = abstract_issubclass(icls, cls); Py_DECREF(icls); } } return retval; } int PyObject_IsInstance(PyObject *inst, PyObject *cls) { static PyObject *name = NULL; PyObject *checker; /* Quick test for an exact match */ if (Py_TYPE(inst) == (PyTypeObject *)cls) return 1; if (PyTuple_Check(cls)) { Py_ssize_t i; Py_ssize_t n; int r = 0; if (Py_EnterRecursiveCall(" in __instancecheck__")) return -1; n = PyTuple_GET_SIZE(cls); for (i = 0; i < n; ++i) { PyObject *item = PyTuple_GET_ITEM(cls, i); r = PyObject_IsInstance(inst, item); if (r != 0) /* either found it, or got an error */ break; } Py_LeaveRecursiveCall(); return r; } if (name == NULL) { name = PyUnicode_InternFromString("__instancecheck__"); if (name == NULL) return -1; } checker = PyObject_GetAttr(cls, name); if (checker == NULL && PyErr_Occurred()) PyErr_Clear(); if (checker != NULL) { PyObject *res; int ok = -1; if (Py_EnterRecursiveCall(" in __instancecheck__")) { Py_DECREF(checker); return ok; } res = PyObject_CallFunctionObjArgs(checker, inst, NULL); Py_LeaveRecursiveCall(); Py_DECREF(checker); if (res != NULL) { ok = PyObject_IsTrue(res); Py_DECREF(res); } return ok; } return recursive_isinstance(inst, cls); } static int recursive_issubclass(PyObject *derived, PyObject *cls) { if (PyType_Check(cls) && PyType_Check(derived)) { /* Fast path (non-recursive) */ return PyType_IsSubtype((PyTypeObject *)derived, (PyTypeObject *)cls); } if (!check_class(derived, "issubclass() arg 1 must be a class")) return -1; if (!check_class(cls, "issubclass() arg 2 must be a class" " or tuple of classes")) return -1; return abstract_issubclass(derived, cls); } int PyObject_IsSubclass(PyObject *derived, PyObject *cls) { static PyObject *name = NULL; PyObject *t, *v, *tb; PyObject *checker; if (PyTuple_Check(cls)) { Py_ssize_t i; Py_ssize_t n; int r = 0; if (Py_EnterRecursiveCall(" in __subclasscheck__")) return -1; n = PyTuple_GET_SIZE(cls); for (i = 0; i < n; ++i) { PyObject *item = PyTuple_GET_ITEM(cls, i); r = PyObject_IsSubclass(derived, item); if (r != 0) /* either found it, or got an error */ break; } Py_LeaveRecursiveCall(); return r; } if (name == NULL) { name = PyUnicode_InternFromString("__subclasscheck__"); if (name == NULL) return -1; } PyErr_Fetch(&t, &v, &tb); checker = PyObject_GetAttr(cls, name); PyErr_Restore(t, v, tb); if (checker != NULL) { PyObject *res; int ok = -1; if (Py_EnterRecursiveCall(" in __subclasscheck__")) { Py_DECREF(checker); return ok; } res = PyObject_CallFunctionObjArgs(checker, derived, NULL); Py_LeaveRecursiveCall(); Py_DECREF(checker); if (res != NULL) { ok = PyObject_IsTrue(res); Py_DECREF(res); } return ok; } return recursive_issubclass(derived, cls); } int _PyObject_RealIsInstance(PyObject *inst, PyObject *cls) { return recursive_isinstance(inst, cls); } int _PyObject_RealIsSubclass(PyObject *derived, PyObject *cls) { return recursive_issubclass(derived, cls); } PyObject * PyObject_GetIter(PyObject *o) { PyTypeObject *t = o->ob_type; getiterfunc f = NULL; f = t->tp_iter; if (f == NULL) { if (PySequence_Check(o)) return PySeqIter_New(o); return type_error("'%.200s' object is not iterable", o); } else { PyObject *res = (*f)(o); if (res != NULL && !PyIter_Check(res)) { PyErr_Format(PyExc_TypeError, "iter() returned non-iterator " "of type '%.100s'", res->ob_type->tp_name); Py_DECREF(res); res = NULL; } return res; } } /* Return next item. * If an error occurs, return NULL. PyErr_Occurred() will be true. * If the iteration terminates normally, return NULL and clear the * PyExc_StopIteration exception (if it was set). PyErr_Occurred() * will be false. * Else return the next object. PyErr_Occurred() will be false. */ PyObject * PyIter_Next(PyObject *iter) { PyObject *result; result = (*iter->ob_type->tp_iternext)(iter); if (result == NULL && PyErr_Occurred() && PyErr_ExceptionMatches(PyExc_StopIteration)) PyErr_Clear(); return result; }