mirror of
https://github.com/python/cpython.git
synced 2024-12-14 12:26:47 +08:00
1ea055bd53
Use vectorcall, and replace `PyObject_SetAttrString` with `PyObject_SetAttr` and a global string.
750 lines
20 KiB
C
750 lines
20 KiB
C
// types.GenericAlias -- used to represent e.g. list[int].
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#include "Python.h"
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#include "pycore_object.h"
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#include "pycore_unionobject.h" // _Py_union_type_or, _PyGenericAlias_Check
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#include "structmember.h" // PyMemberDef
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#include <stdbool.h>
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typedef struct {
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PyObject_HEAD
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PyObject *origin;
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PyObject *args;
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PyObject *parameters;
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PyObject *weakreflist;
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// Whether we're a starred type, e.g. *tuple[int].
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bool starred;
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vectorcallfunc vectorcall;
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} gaobject;
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typedef struct {
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PyObject_HEAD
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PyObject *obj; /* Set to NULL when iterator is exhausted */
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} gaiterobject;
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static void
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ga_dealloc(PyObject *self)
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{
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gaobject *alias = (gaobject *)self;
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_PyObject_GC_UNTRACK(self);
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if (alias->weakreflist != NULL) {
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PyObject_ClearWeakRefs((PyObject *)alias);
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}
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Py_XDECREF(alias->origin);
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Py_XDECREF(alias->args);
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Py_XDECREF(alias->parameters);
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Py_TYPE(self)->tp_free(self);
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}
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static int
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ga_traverse(PyObject *self, visitproc visit, void *arg)
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{
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gaobject *alias = (gaobject *)self;
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Py_VISIT(alias->origin);
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Py_VISIT(alias->args);
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Py_VISIT(alias->parameters);
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return 0;
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}
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static int
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ga_repr_item(_PyUnicodeWriter *writer, PyObject *p)
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{
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PyObject *qualname = NULL;
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PyObject *module = NULL;
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PyObject *r = NULL;
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PyObject *tmp;
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int err;
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if (p == Py_Ellipsis) {
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// The Ellipsis object
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r = PyUnicode_FromString("...");
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goto done;
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}
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if (_PyObject_LookupAttr(p, &_Py_ID(__origin__), &tmp) < 0) {
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goto done;
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}
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if (tmp != NULL) {
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Py_DECREF(tmp);
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if (_PyObject_LookupAttr(p, &_Py_ID(__args__), &tmp) < 0) {
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goto done;
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}
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if (tmp != NULL) {
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Py_DECREF(tmp);
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// It looks like a GenericAlias
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goto use_repr;
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}
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}
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if (_PyObject_LookupAttr(p, &_Py_ID(__qualname__), &qualname) < 0) {
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goto done;
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}
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if (qualname == NULL) {
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goto use_repr;
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}
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if (_PyObject_LookupAttr(p, &_Py_ID(__module__), &module) < 0) {
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goto done;
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}
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if (module == NULL || module == Py_None) {
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goto use_repr;
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}
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// Looks like a class
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if (PyUnicode_Check(module) &&
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_PyUnicode_EqualToASCIIString(module, "builtins"))
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{
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// builtins don't need a module name
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r = PyObject_Str(qualname);
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goto done;
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}
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else {
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r = PyUnicode_FromFormat("%S.%S", module, qualname);
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goto done;
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}
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use_repr:
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r = PyObject_Repr(p);
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done:
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Py_XDECREF(qualname);
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Py_XDECREF(module);
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if (r == NULL) {
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// error if any of the above PyObject_Repr/PyUnicode_From* fail
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err = -1;
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}
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else {
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err = _PyUnicodeWriter_WriteStr(writer, r);
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Py_DECREF(r);
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}
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return err;
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}
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static PyObject *
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ga_repr(PyObject *self)
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{
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gaobject *alias = (gaobject *)self;
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Py_ssize_t len = PyTuple_GET_SIZE(alias->args);
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_PyUnicodeWriter writer;
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_PyUnicodeWriter_Init(&writer);
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if (alias->starred) {
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if (_PyUnicodeWriter_WriteASCIIString(&writer, "*", 1) < 0) {
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goto error;
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}
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}
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if (ga_repr_item(&writer, alias->origin) < 0) {
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goto error;
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}
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if (_PyUnicodeWriter_WriteASCIIString(&writer, "[", 1) < 0) {
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goto error;
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}
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for (Py_ssize_t i = 0; i < len; i++) {
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if (i > 0) {
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if (_PyUnicodeWriter_WriteASCIIString(&writer, ", ", 2) < 0) {
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goto error;
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}
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}
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PyObject *p = PyTuple_GET_ITEM(alias->args, i);
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if (ga_repr_item(&writer, p) < 0) {
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goto error;
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}
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}
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if (len == 0) {
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// for something like tuple[()] we should print a "()"
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if (_PyUnicodeWriter_WriteASCIIString(&writer, "()", 2) < 0) {
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goto error;
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}
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}
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if (_PyUnicodeWriter_WriteASCIIString(&writer, "]", 1) < 0) {
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goto error;
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}
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return _PyUnicodeWriter_Finish(&writer);
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error:
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_PyUnicodeWriter_Dealloc(&writer);
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return NULL;
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}
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// Index of item in self[:len], or -1 if not found (self is a tuple)
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static Py_ssize_t
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tuple_index(PyObject *self, Py_ssize_t len, PyObject *item)
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{
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for (Py_ssize_t i = 0; i < len; i++) {
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if (PyTuple_GET_ITEM(self, i) == item) {
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return i;
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}
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}
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return -1;
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}
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static int
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tuple_add(PyObject *self, Py_ssize_t len, PyObject *item)
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{
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if (tuple_index(self, len, item) < 0) {
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Py_INCREF(item);
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PyTuple_SET_ITEM(self, len, item);
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return 1;
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}
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return 0;
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}
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PyObject *
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_Py_make_parameters(PyObject *args)
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{
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Py_ssize_t nargs = PyTuple_GET_SIZE(args);
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Py_ssize_t len = nargs;
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PyObject *parameters = PyTuple_New(len);
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if (parameters == NULL)
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return NULL;
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Py_ssize_t iparam = 0;
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for (Py_ssize_t iarg = 0; iarg < nargs; iarg++) {
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PyObject *t = PyTuple_GET_ITEM(args, iarg);
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PyObject *subst;
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if (_PyObject_LookupAttr(t, &_Py_ID(__typing_subst__), &subst) < 0) {
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Py_DECREF(parameters);
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return NULL;
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}
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if (subst) {
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iparam += tuple_add(parameters, iparam, t);
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Py_DECREF(subst);
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}
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else {
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PyObject *subparams;
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if (_PyObject_LookupAttr(t, &_Py_ID(__parameters__),
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&subparams) < 0) {
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Py_DECREF(parameters);
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return NULL;
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}
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if (subparams && PyTuple_Check(subparams)) {
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Py_ssize_t len2 = PyTuple_GET_SIZE(subparams);
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Py_ssize_t needed = len2 - 1 - (iarg - iparam);
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if (needed > 0) {
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len += needed;
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if (_PyTuple_Resize(¶meters, len) < 0) {
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Py_DECREF(subparams);
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Py_DECREF(parameters);
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return NULL;
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}
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}
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for (Py_ssize_t j = 0; j < len2; j++) {
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PyObject *t2 = PyTuple_GET_ITEM(subparams, j);
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iparam += tuple_add(parameters, iparam, t2);
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}
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}
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Py_XDECREF(subparams);
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}
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}
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if (iparam < len) {
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if (_PyTuple_Resize(¶meters, iparam) < 0) {
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Py_XDECREF(parameters);
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return NULL;
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}
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}
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return parameters;
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}
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/* If obj is a generic alias, substitute type variables params
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with substitutions argitems. For example, if obj is list[T],
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params is (T, S), and argitems is (str, int), return list[str].
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If obj doesn't have a __parameters__ attribute or that's not
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a non-empty tuple, return a new reference to obj. */
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static PyObject *
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subs_tvars(PyObject *obj, PyObject *params, PyObject **argitems)
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{
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PyObject *subparams;
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if (_PyObject_LookupAttr(obj, &_Py_ID(__parameters__), &subparams) < 0) {
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return NULL;
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}
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if (subparams && PyTuple_Check(subparams) && PyTuple_GET_SIZE(subparams)) {
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Py_ssize_t nparams = PyTuple_GET_SIZE(params);
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Py_ssize_t nsubargs = PyTuple_GET_SIZE(subparams);
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PyObject *subargs = PyTuple_New(nsubargs);
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if (subargs == NULL) {
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Py_DECREF(subparams);
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return NULL;
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}
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for (Py_ssize_t i = 0; i < nsubargs; ++i) {
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PyObject *arg = PyTuple_GET_ITEM(subparams, i);
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Py_ssize_t iparam = tuple_index(params, nparams, arg);
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if (iparam >= 0) {
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arg = argitems[iparam];
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}
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Py_INCREF(arg);
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PyTuple_SET_ITEM(subargs, i, arg);
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}
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obj = PyObject_GetItem(obj, subargs);
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Py_DECREF(subargs);
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}
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else {
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Py_INCREF(obj);
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}
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Py_XDECREF(subparams);
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return obj;
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}
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PyObject *
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_Py_subs_parameters(PyObject *self, PyObject *args, PyObject *parameters, PyObject *item)
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{
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Py_ssize_t nparams = PyTuple_GET_SIZE(parameters);
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if (nparams == 0) {
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return PyErr_Format(PyExc_TypeError,
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"%R is not a generic class",
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self);
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}
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int is_tuple = PyTuple_Check(item);
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Py_ssize_t nitems = is_tuple ? PyTuple_GET_SIZE(item) : 1;
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PyObject **argitems = is_tuple ? &PyTuple_GET_ITEM(item, 0) : &item;
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if (nitems != nparams) {
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return PyErr_Format(PyExc_TypeError,
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"Too %s arguments for %R",
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nitems > nparams ? "many" : "few",
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self);
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}
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/* Replace all type variables (specified by parameters)
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with corresponding values specified by argitems.
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t = list[T]; t[int] -> newargs = [int]
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t = dict[str, T]; t[int] -> newargs = [str, int]
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t = dict[T, list[S]]; t[str, int] -> newargs = [str, list[int]]
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*/
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Py_ssize_t nargs = PyTuple_GET_SIZE(args);
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PyObject *newargs = PyTuple_New(nargs);
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if (newargs == NULL) {
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return NULL;
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}
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for (Py_ssize_t iarg = 0; iarg < nargs; iarg++) {
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PyObject *arg = PyTuple_GET_ITEM(args, iarg);
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PyObject *subst;
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if (_PyObject_LookupAttr(arg, &_Py_ID(__typing_subst__), &subst) < 0) {
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Py_DECREF(newargs);
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return NULL;
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}
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if (subst) {
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Py_ssize_t iparam = tuple_index(parameters, nparams, arg);
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assert(iparam >= 0);
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arg = PyObject_CallOneArg(subst, argitems[iparam]);
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Py_DECREF(subst);
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}
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else {
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arg = subs_tvars(arg, parameters, argitems);
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}
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if (arg == NULL) {
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Py_DECREF(newargs);
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return NULL;
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}
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PyTuple_SET_ITEM(newargs, iarg, arg);
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}
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return newargs;
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}
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static PyObject *
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ga_getitem(PyObject *self, PyObject *item)
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{
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gaobject *alias = (gaobject *)self;
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// Populate __parameters__ if needed.
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if (alias->parameters == NULL) {
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alias->parameters = _Py_make_parameters(alias->args);
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if (alias->parameters == NULL) {
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return NULL;
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}
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}
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PyObject *newargs = _Py_subs_parameters(self, alias->args, alias->parameters, item);
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if (newargs == NULL) {
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return NULL;
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}
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PyObject *res = Py_GenericAlias(alias->origin, newargs);
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Py_DECREF(newargs);
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return res;
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}
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static PyMappingMethods ga_as_mapping = {
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.mp_subscript = ga_getitem,
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};
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static Py_hash_t
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ga_hash(PyObject *self)
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{
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gaobject *alias = (gaobject *)self;
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// TODO: Hash in the hash for the origin
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Py_hash_t h0 = PyObject_Hash(alias->origin);
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if (h0 == -1) {
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return -1;
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}
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Py_hash_t h1 = PyObject_Hash(alias->args);
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if (h1 == -1) {
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return -1;
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}
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return h0 ^ h1;
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}
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static inline PyObject *
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set_orig_class(PyObject *obj, PyObject *self)
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{
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if (obj != NULL) {
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if (PyObject_SetAttr(obj, &_Py_ID(__orig_class__), self) < 0) {
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if (!PyErr_ExceptionMatches(PyExc_AttributeError) &&
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!PyErr_ExceptionMatches(PyExc_TypeError))
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{
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Py_DECREF(obj);
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return NULL;
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}
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PyErr_Clear();
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}
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}
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return obj;
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}
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static PyObject *
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ga_call(PyObject *self, PyObject *args, PyObject *kwds)
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{
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gaobject *alias = (gaobject *)self;
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PyObject *obj = PyObject_Call(alias->origin, args, kwds);
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return set_orig_class(obj, self);
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}
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static PyObject *
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ga_vectorcall(PyObject *self, PyObject *const *args,
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size_t nargsf, PyObject *kwnames)
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{
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gaobject *alias = (gaobject *) self;
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PyObject *obj = PyVectorcall_Function(alias->origin)(alias->origin, args, nargsf, kwnames);
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return set_orig_class(obj, self);
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}
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static const char* const attr_exceptions[] = {
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"__origin__",
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"__args__",
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"__parameters__",
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"__mro_entries__",
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"__reduce_ex__", // needed so we don't look up object.__reduce_ex__
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"__reduce__",
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"__copy__",
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"__deepcopy__",
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NULL,
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};
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static PyObject *
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ga_getattro(PyObject *self, PyObject *name)
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{
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gaobject *alias = (gaobject *)self;
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if (PyUnicode_Check(name)) {
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for (const char * const *p = attr_exceptions; ; p++) {
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if (*p == NULL) {
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return PyObject_GetAttr(alias->origin, name);
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}
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if (_PyUnicode_EqualToASCIIString(name, *p)) {
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break;
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}
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}
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}
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return PyObject_GenericGetAttr(self, name);
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}
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static PyObject *
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ga_richcompare(PyObject *a, PyObject *b, int op)
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{
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if (!_PyGenericAlias_Check(b) ||
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(op != Py_EQ && op != Py_NE))
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{
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Py_RETURN_NOTIMPLEMENTED;
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}
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if (op == Py_NE) {
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PyObject *eq = ga_richcompare(a, b, Py_EQ);
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if (eq == NULL)
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return NULL;
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Py_DECREF(eq);
|
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if (eq == Py_True) {
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Py_RETURN_FALSE;
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}
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else {
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Py_RETURN_TRUE;
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}
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}
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gaobject *aa = (gaobject *)a;
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gaobject *bb = (gaobject *)b;
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int eq = PyObject_RichCompareBool(aa->origin, bb->origin, Py_EQ);
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if (eq < 0) {
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return NULL;
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}
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if (!eq) {
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Py_RETURN_FALSE;
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}
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return PyObject_RichCompare(aa->args, bb->args, Py_EQ);
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}
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static PyObject *
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ga_mro_entries(PyObject *self, PyObject *args)
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|
{
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gaobject *alias = (gaobject *)self;
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return PyTuple_Pack(1, alias->origin);
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}
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static PyObject *
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ga_instancecheck(PyObject *self, PyObject *Py_UNUSED(ignored))
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{
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PyErr_SetString(PyExc_TypeError,
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"isinstance() argument 2 cannot be a parameterized generic");
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return NULL;
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}
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static PyObject *
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ga_subclasscheck(PyObject *self, PyObject *Py_UNUSED(ignored))
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{
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PyErr_SetString(PyExc_TypeError,
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"issubclass() argument 2 cannot be a parameterized generic");
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return NULL;
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}
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static PyObject *
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ga_reduce(PyObject *self, PyObject *Py_UNUSED(ignored))
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|
{
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gaobject *alias = (gaobject *)self;
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return Py_BuildValue("O(OO)", Py_TYPE(alias),
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alias->origin, alias->args);
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}
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static PyObject *
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ga_dir(PyObject *self, PyObject *Py_UNUSED(ignored))
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|
{
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gaobject *alias = (gaobject *)self;
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|
PyObject *dir = PyObject_Dir(alias->origin);
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|
if (dir == NULL) {
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return NULL;
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|
}
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|
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PyObject *dir_entry = NULL;
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|
for (const char * const *p = attr_exceptions; ; p++) {
|
|
if (*p == NULL) {
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break;
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}
|
|
else {
|
|
dir_entry = PyUnicode_FromString(*p);
|
|
if (dir_entry == NULL) {
|
|
goto error;
|
|
}
|
|
int contains = PySequence_Contains(dir, dir_entry);
|
|
if (contains < 0) {
|
|
goto error;
|
|
}
|
|
if (contains == 0 && PyList_Append(dir, dir_entry) < 0) {
|
|
goto error;
|
|
}
|
|
|
|
Py_CLEAR(dir_entry);
|
|
}
|
|
}
|
|
return dir;
|
|
|
|
error:
|
|
Py_DECREF(dir);
|
|
Py_XDECREF(dir_entry);
|
|
return NULL;
|
|
}
|
|
|
|
static PyMethodDef ga_methods[] = {
|
|
{"__mro_entries__", ga_mro_entries, METH_O},
|
|
{"__instancecheck__", ga_instancecheck, METH_O},
|
|
{"__subclasscheck__", ga_subclasscheck, METH_O},
|
|
{"__reduce__", ga_reduce, METH_NOARGS},
|
|
{"__dir__", ga_dir, METH_NOARGS},
|
|
{0}
|
|
};
|
|
|
|
static PyMemberDef ga_members[] = {
|
|
{"__origin__", T_OBJECT, offsetof(gaobject, origin), READONLY},
|
|
{"__args__", T_OBJECT, offsetof(gaobject, args), READONLY},
|
|
{0}
|
|
};
|
|
|
|
static PyObject *
|
|
ga_parameters(PyObject *self, void *unused)
|
|
{
|
|
gaobject *alias = (gaobject *)self;
|
|
if (alias->parameters == NULL) {
|
|
alias->parameters = _Py_make_parameters(alias->args);
|
|
if (alias->parameters == NULL) {
|
|
return NULL;
|
|
}
|
|
}
|
|
Py_INCREF(alias->parameters);
|
|
return alias->parameters;
|
|
}
|
|
|
|
static PyGetSetDef ga_properties[] = {
|
|
{"__parameters__", ga_parameters, (setter)NULL, "Type variables in the GenericAlias.", NULL},
|
|
{0}
|
|
};
|
|
|
|
/* A helper function to create GenericAlias' args tuple and set its attributes.
|
|
* Returns 1 on success, 0 on failure.
|
|
*/
|
|
static inline int
|
|
setup_ga(gaobject *alias, PyObject *origin, PyObject *args) {
|
|
if (!PyTuple_Check(args)) {
|
|
args = PyTuple_Pack(1, args);
|
|
if (args == NULL) {
|
|
return 0;
|
|
}
|
|
}
|
|
else {
|
|
Py_INCREF(args);
|
|
}
|
|
|
|
Py_INCREF(origin);
|
|
alias->origin = origin;
|
|
alias->args = args;
|
|
alias->parameters = NULL;
|
|
alias->weakreflist = NULL;
|
|
|
|
if (PyVectorcall_Function(origin) != NULL) {
|
|
alias->vectorcall = ga_vectorcall;
|
|
}
|
|
else {
|
|
alias->vectorcall = NULL;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static PyObject *
|
|
ga_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
|
|
{
|
|
if (!_PyArg_NoKeywords("GenericAlias", kwds)) {
|
|
return NULL;
|
|
}
|
|
if (!_PyArg_CheckPositional("GenericAlias", PyTuple_GET_SIZE(args), 2, 2)) {
|
|
return NULL;
|
|
}
|
|
PyObject *origin = PyTuple_GET_ITEM(args, 0);
|
|
PyObject *arguments = PyTuple_GET_ITEM(args, 1);
|
|
gaobject *self = (gaobject *)type->tp_alloc(type, 0);
|
|
if (self == NULL) {
|
|
return NULL;
|
|
}
|
|
if (!setup_ga(self, origin, arguments)) {
|
|
Py_DECREF(self);
|
|
return NULL;
|
|
}
|
|
return (PyObject *)self;
|
|
}
|
|
|
|
static PyNumberMethods ga_as_number = {
|
|
.nb_or = _Py_union_type_or, // Add __or__ function
|
|
};
|
|
|
|
static PyObject *
|
|
ga_iternext(gaiterobject *gi) {
|
|
if (gi->obj == NULL) {
|
|
PyErr_SetNone(PyExc_StopIteration);
|
|
return NULL;
|
|
}
|
|
gaobject *alias = (gaobject *)gi->obj;
|
|
PyObject *starred_alias = Py_GenericAlias(alias->origin, alias->args);
|
|
if (starred_alias == NULL) {
|
|
return NULL;
|
|
}
|
|
((gaobject *)starred_alias)->starred = true;
|
|
Py_SETREF(gi->obj, NULL);
|
|
return starred_alias;
|
|
}
|
|
|
|
static void
|
|
ga_iter_dealloc(gaiterobject *gi) {
|
|
PyObject_GC_UnTrack(gi);
|
|
Py_XDECREF(gi->obj);
|
|
PyObject_GC_Del(gi);
|
|
}
|
|
|
|
static int
|
|
ga_iter_traverse(gaiterobject *gi, visitproc visit, void *arg)
|
|
{
|
|
Py_VISIT(gi->obj);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ga_iter_clear(PyObject *self) {
|
|
gaiterobject *gi = (gaiterobject *)self;
|
|
Py_CLEAR(gi->obj);
|
|
return 0;
|
|
}
|
|
|
|
static PyTypeObject Py_GenericAliasIterType = {
|
|
PyVarObject_HEAD_INIT(&PyType_Type, 0)
|
|
.tp_name = "generic_alias_iterator",
|
|
.tp_basicsize = sizeof(gaiterobject),
|
|
.tp_iter = PyObject_SelfIter,
|
|
.tp_iternext = (iternextfunc)ga_iternext,
|
|
.tp_traverse = (traverseproc)ga_iter_traverse,
|
|
.tp_dealloc = (destructor)ga_iter_dealloc,
|
|
.tp_clear = (inquiry)ga_iter_clear,
|
|
.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,
|
|
};
|
|
|
|
static PyObject *
|
|
ga_iter(PyObject *self) {
|
|
gaiterobject *gi = PyObject_GC_New(gaiterobject, &Py_GenericAliasIterType);
|
|
if (gi == NULL) {
|
|
return NULL;
|
|
}
|
|
gi->obj = Py_NewRef(self);
|
|
PyObject_GC_Track(gi);
|
|
return (PyObject *)gi;
|
|
}
|
|
|
|
// TODO:
|
|
// - argument clinic?
|
|
// - __doc__?
|
|
// - cache?
|
|
PyTypeObject Py_GenericAliasType = {
|
|
PyVarObject_HEAD_INIT(&PyType_Type, 0)
|
|
.tp_name = "types.GenericAlias",
|
|
.tp_doc = "Represent a PEP 585 generic type\n"
|
|
"\n"
|
|
"E.g. for t = list[int], t.__origin__ is list and t.__args__ is (int,).",
|
|
.tp_basicsize = sizeof(gaobject),
|
|
.tp_dealloc = ga_dealloc,
|
|
.tp_repr = ga_repr,
|
|
.tp_as_number = &ga_as_number, // allow X | Y of GenericAlias objs
|
|
.tp_as_mapping = &ga_as_mapping,
|
|
.tp_hash = ga_hash,
|
|
.tp_call = ga_call,
|
|
.tp_getattro = ga_getattro,
|
|
.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_VECTORCALL,
|
|
.tp_traverse = ga_traverse,
|
|
.tp_richcompare = ga_richcompare,
|
|
.tp_weaklistoffset = offsetof(gaobject, weakreflist),
|
|
.tp_methods = ga_methods,
|
|
.tp_members = ga_members,
|
|
.tp_alloc = PyType_GenericAlloc,
|
|
.tp_new = ga_new,
|
|
.tp_free = PyObject_GC_Del,
|
|
.tp_getset = ga_properties,
|
|
.tp_iter = (getiterfunc)ga_iter,
|
|
.tp_vectorcall_offset = offsetof(gaobject, vectorcall),
|
|
};
|
|
|
|
PyObject *
|
|
Py_GenericAlias(PyObject *origin, PyObject *args)
|
|
{
|
|
gaobject *alias = (gaobject*) PyType_GenericAlloc(
|
|
(PyTypeObject *)&Py_GenericAliasType, 0);
|
|
if (alias == NULL) {
|
|
return NULL;
|
|
}
|
|
if (!setup_ga(alias, origin, args)) {
|
|
Py_DECREF(alias);
|
|
return NULL;
|
|
}
|
|
return (PyObject *)alias;
|
|
}
|