--- a/mercurial/dirs.c	Wed Jul 05 11:24:22 2017 -0400
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,315 +0,0 @@
-/*
- dirs.c - dynamic directory diddling for dirstates
-
- Copyright 2013 Facebook
-
- This software may be used and distributed according to the terms of
- the GNU General Public License, incorporated herein by reference.
-*/
-
-#define PY_SSIZE_T_CLEAN
-#include <Python.h>
-#include "util.h"
-
-#ifdef IS_PY3K
-#define PYLONG_VALUE(o) ((PyLongObject *)o)->ob_digit[1]
-#else
-#define PYLONG_VALUE(o) PyInt_AS_LONG(o)
-#endif
-
-/*
- * This is a multiset of directory names, built from the files that
- * appear in a dirstate or manifest.
- *
- * A few implementation notes:
- *
- * We modify Python integers for refcounting, but those integers are
- * never visible to Python code.
- *
- * We mutate strings in-place, but leave them immutable once they can
- * be seen by Python code.
- */
-typedef struct {
-	PyObject_HEAD
-	PyObject *dict;
-} dirsObject;
-
-static inline Py_ssize_t _finddir(const char *path, Py_ssize_t pos)
-{
-	while (pos != -1) {
-		if (path[pos] == '/')
-			break;
-		pos -= 1;
-	}
-
-	return pos;
-}
-
-static int _addpath(PyObject *dirs, PyObject *path)
-{
-	const char *cpath = PyBytes_AS_STRING(path);
-	Py_ssize_t pos = PyBytes_GET_SIZE(path);
-	PyObject *key = NULL;
-	int ret = -1;
-
-	/* This loop is super critical for performance. That's why we inline
-	* access to Python structs instead of going through a supported API.
-	* The implementation, therefore, is heavily dependent on CPython
-	* implementation details. We also commit violations of the Python
-	* "protocol" such as mutating immutable objects. But since we only
-	* mutate objects created in this function or in other well-defined
-	* locations, the references are known so these violations should go
-	* unnoticed. The code for adjusting the length of a PyBytesObject is
-	* essentially a minimal version of _PyBytes_Resize. */
-	while ((pos = _finddir(cpath, pos - 1)) != -1) {
-		PyObject *val;
-
-		/* It's likely that every prefix already has an entry
-		   in our dict. Try to avoid allocating and
-		   deallocating a string for each prefix we check. */
-		if (key != NULL)
-			((PyBytesObject *)key)->ob_shash = -1;
-		else {
-			/* Force Python to not reuse a small shared string. */
-			key = PyBytes_FromStringAndSize(cpath,
-							 pos < 2 ? 2 : pos);
-			if (key == NULL)
-				goto bail;
-		}
-		/* Py_SIZE(o) refers to the ob_size member of the struct. Yes,
-		* assigning to what looks like a function seems wrong. */
-		Py_SIZE(key) = pos;
-		((PyBytesObject *)key)->ob_sval[pos] = '\0';
-
-		val = PyDict_GetItem(dirs, key);
-		if (val != NULL) {
-			PYLONG_VALUE(val) += 1;
-			break;
-		}
-
-		/* Force Python to not reuse a small shared int. */
-#ifdef IS_PY3K
-		val = PyLong_FromLong(0x1eadbeef);
-#else
-		val = PyInt_FromLong(0x1eadbeef);
-#endif
-
-		if (val == NULL)
-			goto bail;
-
-		PYLONG_VALUE(val) = 1;
-		ret = PyDict_SetItem(dirs, key, val);
-		Py_DECREF(val);
-		if (ret == -1)
-			goto bail;
-		Py_CLEAR(key);
-	}
-	ret = 0;
-
-bail:
-	Py_XDECREF(key);
-
-	return ret;
-}
-
-static int _delpath(PyObject *dirs, PyObject *path)
-{
-	char *cpath = PyBytes_AS_STRING(path);
-	Py_ssize_t pos = PyBytes_GET_SIZE(path);
-	PyObject *key = NULL;
-	int ret = -1;
-
-	while ((pos = _finddir(cpath, pos - 1)) != -1) {
-		PyObject *val;
-
-		key = PyBytes_FromStringAndSize(cpath, pos);
-
-		if (key == NULL)
-			goto bail;
-
-		val = PyDict_GetItem(dirs, key);
-		if (val == NULL) {
-			PyErr_SetString(PyExc_ValueError,
-					"expected a value, found none");
-			goto bail;
-		}
-
-		if (--PYLONG_VALUE(val) <= 0) {
-			if (PyDict_DelItem(dirs, key) == -1)
-				goto bail;
-		} else
-			break;
-		Py_CLEAR(key);
-	}
-	ret = 0;
-
-bail:
-	Py_XDECREF(key);
-
-	return ret;
-}
-
-static int dirs_fromdict(PyObject *dirs, PyObject *source, char skipchar)
-{
-	PyObject *key, *value;
-	Py_ssize_t pos = 0;
-
-	while (PyDict_Next(source, &pos, &key, &value)) {
-		if (!PyBytes_Check(key)) {
-			PyErr_SetString(PyExc_TypeError, "expected string key");
-			return -1;
-		}
-		if (skipchar) {
-			if (!dirstate_tuple_check(value)) {
-				PyErr_SetString(PyExc_TypeError,
-						"expected a dirstate tuple");
-				return -1;
-			}
-			if (((dirstateTupleObject *)value)->state == skipchar)
-				continue;
-		}
-
-		if (_addpath(dirs, key) == -1)
-			return -1;
-	}
-
-	return 0;
-}
-
-static int dirs_fromiter(PyObject *dirs, PyObject *source)
-{
-	PyObject *iter, *item = NULL;
-	int ret;
-
-	iter = PyObject_GetIter(source);
-	if (iter == NULL)
-		return -1;
-
-	while ((item = PyIter_Next(iter)) != NULL) {
-		if (!PyBytes_Check(item)) {
-			PyErr_SetString(PyExc_TypeError, "expected string");
-			break;
-		}
-
-		if (_addpath(dirs, item) == -1)
-			break;
-		Py_CLEAR(item);
-	}
-
-	ret = PyErr_Occurred() ? -1 : 0;
-	Py_DECREF(iter);
-	Py_XDECREF(item);
-	return ret;
-}
-
-/*
- * Calculate a refcounted set of directory names for the files in a
- * dirstate.
- */
-static int dirs_init(dirsObject *self, PyObject *args)
-{
-	PyObject *dirs = NULL, *source = NULL;
-	char skipchar = 0;
-	int ret = -1;
-
-	self->dict = NULL;
-
-	if (!PyArg_ParseTuple(args, "|Oc:__init__", &source, &skipchar))
-		return -1;
-
-	dirs = PyDict_New();
-
-	if (dirs == NULL)
-		return -1;
-
-	if (source == NULL)
-		ret = 0;
-	else if (PyDict_Check(source))
-		ret = dirs_fromdict(dirs, source, skipchar);
-	else if (skipchar)
-		PyErr_SetString(PyExc_ValueError,
-				"skip character is only supported "
-				"with a dict source");
-	else
-		ret = dirs_fromiter(dirs, source);
-
-	if (ret == -1)
-		Py_XDECREF(dirs);
-	else
-		self->dict = dirs;
-
-	return ret;
-}
-
-PyObject *dirs_addpath(dirsObject *self, PyObject *args)
-{
-	PyObject *path;
-
-	if (!PyArg_ParseTuple(args, "O!:addpath", &PyBytes_Type, &path))
-		return NULL;
-
-	if (_addpath(self->dict, path) == -1)
-		return NULL;
-
-	Py_RETURN_NONE;
-}
-
-static PyObject *dirs_delpath(dirsObject *self, PyObject *args)
-{
-	PyObject *path;
-
-	if (!PyArg_ParseTuple(args, "O!:delpath", &PyBytes_Type, &path))
-		return NULL;
-
-	if (_delpath(self->dict, path) == -1)
-		return NULL;
-
-	Py_RETURN_NONE;
-}
-
-static int dirs_contains(dirsObject *self, PyObject *value)
-{
-	return PyBytes_Check(value) ? PyDict_Contains(self->dict, value) : 0;
-}
-
-static void dirs_dealloc(dirsObject *self)
-{
-	Py_XDECREF(self->dict);
-	PyObject_Del(self);
-}
-
-static PyObject *dirs_iter(dirsObject *self)
-{
-	return PyObject_GetIter(self->dict);
-}
-
-static PySequenceMethods dirs_sequence_methods;
-
-static PyMethodDef dirs_methods[] = {
-	{"addpath", (PyCFunction)dirs_addpath, METH_VARARGS, "add a path"},
-	{"delpath", (PyCFunction)dirs_delpath, METH_VARARGS, "remove a path"},
-	{NULL} /* Sentinel */
-};
-
-static PyTypeObject dirsType = { PyVarObject_HEAD_INIT(NULL, 0) };
-
-void dirs_module_init(PyObject *mod)
-{
-	dirs_sequence_methods.sq_contains = (objobjproc)dirs_contains;
-	dirsType.tp_name = "parsers.dirs";
-	dirsType.tp_new = PyType_GenericNew;
-	dirsType.tp_basicsize = sizeof(dirsObject);
-	dirsType.tp_dealloc = (destructor)dirs_dealloc;
-	dirsType.tp_as_sequence = &dirs_sequence_methods;
-	dirsType.tp_flags = Py_TPFLAGS_DEFAULT;
-	dirsType.tp_doc = "dirs";
-	dirsType.tp_iter = (getiterfunc)dirs_iter;
-	dirsType.tp_methods = dirs_methods;
-	dirsType.tp_init = (initproc)dirs_init;
-
-	if (PyType_Ready(&dirsType) < 0)
-		return;
-	Py_INCREF(&dirsType);
-
-	PyModule_AddObject(mod, "dirs", (PyObject *)&dirsType);
-}