annotate mercurial/manifest.c @ 32151:4d504e541d3d

rebase: use matcher to optimize manifestmerge

The old merge code would call manifestmerge and calculate the complete diff
between the source to the destination. In many cases, like rebase, the vast
majority of differences between the source and destination are irrelevant
because they are differences between the destination and the common ancestor
only, and therefore don't affect the merge. Since most actions are 'keep', all
the effort to compute them is wasted.

Instead, let's compute the difference between the source and the common ancestor
and only perform the diff of those files against the merge destination. When
using treemanifest, this lets us avoid loading almost the entire tree when
rebasing from a very old ancestor. This speeds up rebase of an old stack of 27
commits by 20x.

In mozilla-central, without treemanifest, when rebasing a commit from
default~100000 to default, this speeds up the manifestmerge step from 2.6s to
1.2s.  However, the additional diff adds an overhead to all manifestmerge calls,
especially for flat manifests. When rebasing a commit from default~1 to default
it appears to add 100ms in mozilla-central. While we could put this optimization
behind a flag, I think the fact that it makes merge O(number of changes being
applied) instead of O(number of changes between X and Y) justifies it.

/*
 * manifest.c - manifest type that does on-demand parsing.
 *
 * Copyright 2015, Google Inc.
 *
 * This software may be used and distributed according to the terms of
 * the GNU General Public License, incorporated herein by reference.
 */
#include <Python.h>

#include <assert.h>
#include <string.h>
#include <stdlib.h>

#include "util.h"

#define DEFAULT_LINES 100000

typedef struct {
	char *start;
	Py_ssize_t len; /* length of line including terminal newline */
	char hash_suffix;
	bool from_malloc;
	bool deleted;
} line;

typedef struct {
	PyObject_HEAD
	PyObject *pydata;
	line *lines;
	int numlines; /* number of line entries */
	int livelines; /* number of non-deleted lines */
	int maxlines; /* allocated number of lines */
	bool dirty;
} lazymanifest;

#define MANIFEST_OOM -1
#define MANIFEST_NOT_SORTED -2
#define MANIFEST_MALFORMED -3

/* defined in parsers.c */
PyObject *unhexlify(const char *str, int len);

/* get the length of the path for a line */
static size_t pathlen(line *l) {
	return strlen(l->start);
}

/* get the node value of a single line */
static PyObject *nodeof(line *l) {
	char *s = l->start;
	ssize_t llen = pathlen(l);
	PyObject *hash = unhexlify(s + llen + 1, 40);
	if (!hash) {
		return NULL;
	}
	if (l->hash_suffix != '\0') {
		char newhash[21];
		memcpy(newhash, PyBytes_AsString(hash), 20);
		Py_DECREF(hash);
		newhash[20] = l->hash_suffix;
		hash = PyBytes_FromStringAndSize(newhash, 21);
	}
	return hash;
}

/* get the node hash and flags of a line as a tuple */
static PyObject *hashflags(line *l)
{
	char *s = l->start;
	size_t plen = pathlen(l);
	PyObject *hash = nodeof(l);

	/* 40 for hash, 1 for null byte, 1 for newline */
	size_t hplen = plen + 42;
	Py_ssize_t flen = l->len - hplen;
	PyObject *flags;
	PyObject *tup;

	if (!hash)
		return NULL;
	flags = PyBytes_FromStringAndSize(s + hplen - 1, flen);
	if (!flags) {
		Py_DECREF(hash);
		return NULL;
	}
	tup = PyTuple_Pack(2, hash, flags);
	Py_DECREF(flags);
	Py_DECREF(hash);
	return tup;
}

/* if we're about to run out of space in the line index, add more */
static bool realloc_if_full(lazymanifest *self)
{
	if (self->numlines == self->maxlines) {
		self->maxlines *= 2;
		self->lines = realloc(self->lines, self->maxlines * sizeof(line));
	}
	return !!self->lines;
}

/*
 * Find the line boundaries in the manifest that 'data' points to and store
 * information about each line in 'self'.
 */
static int find_lines(lazymanifest *self, char *data, Py_ssize_t len)
{
	char *prev = NULL;
	while (len > 0) {
		line *l;
		char *next = memchr(data, '\n', len);
		if (!next) {
			return MANIFEST_MALFORMED;
		}
		next++; /* advance past newline */
		if (!realloc_if_full(self)) {
			return MANIFEST_OOM; /* no memory */
		}
		if (prev && strcmp(prev, data) > -1) {
			/* This data isn't sorted, so we have to abort. */
			return MANIFEST_NOT_SORTED;
		}
		l = self->lines + ((self->numlines)++);
		l->start = data;
		l->len = next - data;
		l->hash_suffix = '\0';
		l->from_malloc = false;
		l->deleted = false;
		len = len - l->len;
		prev = data;
		data = next;
	}
	self->livelines = self->numlines;
	return 0;
}

static int lazymanifest_init(lazymanifest *self, PyObject *args)
{
	char *data;
	Py_ssize_t len;
	int err, ret;
	PyObject *pydata;
	if (!PyArg_ParseTuple(args, "S", &pydata)) {
		return -1;
	}
	err = PyBytes_AsStringAndSize(pydata, &data, &len);

	self->dirty = false;
	if (err == -1)
		return -1;
	self->pydata = pydata;
	Py_INCREF(self->pydata);
	Py_BEGIN_ALLOW_THREADS
	self->lines = malloc(DEFAULT_LINES * sizeof(line));
	self->maxlines = DEFAULT_LINES;
	self->numlines = 0;
	if (!self->lines)
		ret = MANIFEST_OOM;
	else
		ret = find_lines(self, data, len);
	Py_END_ALLOW_THREADS
	switch (ret) {
	case 0:
		break;
	case MANIFEST_OOM:
		PyErr_NoMemory();
		break;
	case MANIFEST_NOT_SORTED:
		PyErr_Format(PyExc_ValueError,
			     "Manifest lines not in sorted order.");
		break;
	case MANIFEST_MALFORMED:
		PyErr_Format(PyExc_ValueError,
			     "Manifest did not end in a newline.");
		break;
	default:
		PyErr_Format(PyExc_ValueError,
			     "Unknown problem parsing manifest.");
	}
	return ret == 0 ? 0 : -1;
}

static void lazymanifest_dealloc(lazymanifest *self)
{
	/* free any extra lines we had to allocate */
	int i;
	for (i = 0; i < self->numlines; i++) {
		if (self->lines[i].from_malloc) {
			free(self->lines[i].start);
		}
	}
	if (self->lines) {
		free(self->lines);
		self->lines = NULL;
	}
	if (self->pydata) {
		Py_DECREF(self->pydata);
		self->pydata = NULL;
	}
	PyObject_Del(self);
}

/* iteration support */

typedef struct {
	PyObject_HEAD lazymanifest *m;
	Py_ssize_t pos;
} lmIter;

static void lmiter_dealloc(PyObject *o)
{
	lmIter *self = (lmIter *)o;
	Py_DECREF(self->m);
	PyObject_Del(self);
}

static line *lmiter_nextline(lmIter *self)
{
	do {
		self->pos++;
		if (self->pos >= self->m->numlines) {
			return NULL;
		}
		/* skip over deleted manifest entries */
	} while (self->m->lines[self->pos].deleted);
	return self->m->lines + self->pos;
}

static PyObject *lmiter_iterentriesnext(PyObject *o)
{
	size_t pl;
	line *l;
	Py_ssize_t consumed;
	PyObject *ret = NULL, *path = NULL, *hash = NULL, *flags = NULL;
	l = lmiter_nextline((lmIter *)o);
	if (!l) {
		goto done;
	}
	pl = pathlen(l);
	path = PyBytes_FromStringAndSize(l->start, pl);
	hash = nodeof(l);
	consumed = pl + 41;
	flags = PyBytes_FromStringAndSize(l->start + consumed,
					   l->len - consumed - 1);
	if (!path || !hash || !flags) {
		goto done;
	}
	ret = PyTuple_Pack(3, path, hash, flags);
done:
	Py_XDECREF(path);
	Py_XDECREF(hash);
	Py_XDECREF(flags);
	return ret;
}

#ifdef IS_PY3K
#define LAZYMANIFESTENTRIESITERATOR_TPFLAGS Py_TPFLAGS_DEFAULT
#else
#define LAZYMANIFESTENTRIESITERATOR_TPFLAGS Py_TPFLAGS_DEFAULT \
	| Py_TPFLAGS_HAVE_ITER
#endif

static PyTypeObject lazymanifestEntriesIterator = {
	PyVarObject_HEAD_INIT(NULL, 0)
	"parsers.lazymanifest.entriesiterator", /*tp_name */
	sizeof(lmIter),                  /*tp_basicsize */
	0,                               /*tp_itemsize */
	lmiter_dealloc,                  /*tp_dealloc */
	0,                               /*tp_print */
	0,                               /*tp_getattr */
	0,                               /*tp_setattr */
	0,                               /*tp_compare */
	0,                               /*tp_repr */
	0,                               /*tp_as_number */
	0,                               /*tp_as_sequence */
	0,                               /*tp_as_mapping */
	0,                               /*tp_hash */
	0,                               /*tp_call */
	0,                               /*tp_str */
	0,                               /*tp_getattro */
	0,                               /*tp_setattro */
	0,                               /*tp_as_buffer */
	LAZYMANIFESTENTRIESITERATOR_TPFLAGS, /* tp_flags */
	"Iterator for 3-tuples in a lazymanifest.",  /* tp_doc */
	0,                               /* tp_traverse */
	0,                               /* tp_clear */
	0,                               /* tp_richcompare */
	0,                               /* tp_weaklistoffset */
	PyObject_SelfIter,               /* tp_iter: __iter__() method */
	lmiter_iterentriesnext,          /* tp_iternext: next() method */
};

static PyObject *lmiter_iterkeysnext(PyObject *o)
{
	size_t pl;
	line *l = lmiter_nextline((lmIter *)o);
	if (!l) {
		return NULL;
	}
	pl = pathlen(l);
	return PyBytes_FromStringAndSize(l->start, pl);
}

#ifdef IS_PY3K
#define LAZYMANIFESTKEYSITERATOR_TPFLAGS Py_TPFLAGS_DEFAULT
#else
#define LAZYMANIFESTKEYSITERATOR_TPFLAGS Py_TPFLAGS_DEFAULT \
	| Py_TPFLAGS_HAVE_ITER
#endif

static PyTypeObject lazymanifestKeysIterator = {
	PyVarObject_HEAD_INIT(NULL, 0)
	"parsers.lazymanifest.keysiterator", /*tp_name */
	sizeof(lmIter),                  /*tp_basicsize */
	0,                               /*tp_itemsize */
	lmiter_dealloc,                  /*tp_dealloc */
	0,                               /*tp_print */
	0,                               /*tp_getattr */
	0,                               /*tp_setattr */
	0,                               /*tp_compare */
	0,                               /*tp_repr */
	0,                               /*tp_as_number */
	0,                               /*tp_as_sequence */
	0,                               /*tp_as_mapping */
	0,                               /*tp_hash */
	0,                               /*tp_call */
	0,                               /*tp_str */
	0,                               /*tp_getattro */
	0,                               /*tp_setattro */
	0,                               /*tp_as_buffer */
	LAZYMANIFESTKEYSITERATOR_TPFLAGS, /* tp_flags */
	"Keys iterator for a lazymanifest.",  /* tp_doc */
	0,                               /* tp_traverse */
	0,                               /* tp_clear */
	0,                               /* tp_richcompare */
	0,                               /* tp_weaklistoffset */
	PyObject_SelfIter,               /* tp_iter: __iter__() method */
	lmiter_iterkeysnext,             /* tp_iternext: next() method */
};

static lazymanifest *lazymanifest_copy(lazymanifest *self);

static PyObject *lazymanifest_getentriesiter(lazymanifest *self)
{
	lmIter *i = NULL;
	lazymanifest *t = lazymanifest_copy(self);
	if (!t) {
		PyErr_NoMemory();
		return NULL;
	}
	i = PyObject_New(lmIter, &lazymanifestEntriesIterator);
	if (i) {
		i->m = t;
		i->pos = -1;
	} else {
		Py_DECREF(t);
		PyErr_NoMemory();
	}
	return (PyObject *)i;
}

static PyObject *lazymanifest_getkeysiter(lazymanifest *self)
{
	lmIter *i = NULL;
	lazymanifest *t = lazymanifest_copy(self);
	if (!t) {
		PyErr_NoMemory();
		return NULL;
	}
	i = PyObject_New(lmIter, &lazymanifestKeysIterator);
	if (i) {
		i->m = t;
		i->pos = -1;
	} else {
		Py_DECREF(t);
		PyErr_NoMemory();
	}
	return (PyObject *)i;
}

/* __getitem__ and __setitem__ support */

static Py_ssize_t lazymanifest_size(lazymanifest *self)
{
	return self->livelines;
}

static int linecmp(const void *left, const void *right)
{
	return strcmp(((const line *)left)->start,
		      ((const line *)right)->start);
}

static PyObject *lazymanifest_getitem(lazymanifest *self, PyObject *key)
{
	line needle;
	line *hit;
	if (!PyBytes_Check(key)) {
		PyErr_Format(PyExc_TypeError,
			     "getitem: manifest keys must be a string.");
		return NULL;
	}
	needle.start = PyBytes_AsString(key);
	hit = bsearch(&needle, self->lines, self->numlines, sizeof(line),
		      &linecmp);
	if (!hit || hit->deleted) {
		PyErr_Format(PyExc_KeyError, "No such manifest entry.");
		return NULL;
	}
	return hashflags(hit);
}

static int lazymanifest_delitem(lazymanifest *self, PyObject *key)
{
	line needle;
	line *hit;
	if (!PyBytes_Check(key)) {
		PyErr_Format(PyExc_TypeError,
			     "delitem: manifest keys must be a string.");
		return -1;
	}
	needle.start = PyBytes_AsString(key);
	hit = bsearch(&needle, self->lines, self->numlines, sizeof(line),
		      &linecmp);
	if (!hit || hit->deleted) {
		PyErr_Format(PyExc_KeyError,
			     "Tried to delete nonexistent manifest entry.");
		return -1;
	}
	self->dirty = true;
	hit->deleted = true;
	self->livelines--;
	return 0;
}

/* Do a binary search for the insertion point for new, creating the
 * new entry if needed. */
static int internalsetitem(lazymanifest *self, line *new) {
	int start = 0, end = self->numlines;
	while (start < end) {
		int pos = start + (end - start) / 2;
		int c = linecmp(new, self->lines + pos);
		if (c < 0)
			end = pos;
		else if (c > 0)
			start = pos + 1;
		else {
			if (self->lines[pos].deleted)
				self->livelines++;
			if (self->lines[pos].from_malloc)
				free(self->lines[pos].start);
			start = pos;
			goto finish;
		}
	}
	/* being here means we need to do an insert */
	if (!realloc_if_full(self)) {
		PyErr_NoMemory();
		return -1;
	}
	memmove(self->lines + start + 1, self->lines + start,
		(self->numlines - start) * sizeof(line));
	self->numlines++;
	self->livelines++;
finish:
	self->lines[start] = *new;
	self->dirty = true;
	return 0;
}

static int lazymanifest_setitem(
	lazymanifest *self, PyObject *key, PyObject *value)
{
	char *path;
	Py_ssize_t plen;
	PyObject *pyhash;
	Py_ssize_t hlen;
	char *hash;
	PyObject *pyflags;
	char *flags;
	Py_ssize_t flen;
	size_t dlen;
	char *dest;
	int i;
	line new;
	if (!PyBytes_Check(key)) {
		PyErr_Format(PyExc_TypeError,
			     "setitem: manifest keys must be a string.");
		return -1;
	}
	if (!value) {
		return lazymanifest_delitem(self, key);
	}
	if (!PyTuple_Check(value) || PyTuple_Size(value) != 2) {
		PyErr_Format(PyExc_TypeError,
			     "Manifest values must be a tuple of (node, flags).");
		return -1;
	}
	if (PyBytes_AsStringAndSize(key, &path, &plen) == -1) {
		return -1;
	}

	pyhash = PyTuple_GetItem(value, 0);
	if (!PyBytes_Check(pyhash)) {
		PyErr_Format(PyExc_TypeError,
			     "node must be a 20-byte string");
		return -1;
	}
	hlen = PyBytes_Size(pyhash);
	/* Some parts of the codebase try and set 21 or 22
	 * byte "hash" values in order to perturb things for
	 * status. We have to preserve at least the 21st
	 * byte. Sigh. If there's a 22nd byte, we drop it on
	 * the floor, which works fine.
	 */
	if (hlen != 20 && hlen != 21 && hlen != 22) {
		PyErr_Format(PyExc_TypeError,
			     "node must be a 20-byte string");
		return -1;
	}
	hash = PyBytes_AsString(pyhash);

	pyflags = PyTuple_GetItem(value, 1);
	if (!PyBytes_Check(pyflags) || PyBytes_Size(pyflags) > 1) {
		PyErr_Format(PyExc_TypeError,
			     "flags must a 0 or 1 byte string");
		return -1;
	}
	if (PyBytes_AsStringAndSize(pyflags, &flags, &flen) == -1) {
		return -1;
	}
	/* one null byte and one newline */
	dlen = plen + 41 + flen + 1;
	dest = malloc(dlen);
	if (!dest) {
		PyErr_NoMemory();
		return -1;
	}
	memcpy(dest, path, plen + 1);
	for (i = 0; i < 20; i++) {
		/* Cast to unsigned, so it will not get sign-extended when promoted
		 * to int (as is done when passing to a variadic function)
		 */
		sprintf(dest + plen + 1 + (i * 2), "%02x", (unsigned char)hash[i]);
	}
	memcpy(dest + plen + 41, flags, flen);
	dest[plen + 41 + flen] = '\n';
	new.start = dest;
	new.len = dlen;
	new.hash_suffix = '\0';
	if (hlen > 20) {
		new.hash_suffix = hash[20];
	}
	new.from_malloc = true;     /* is `start` a pointer we allocated? */
	new.deleted = false;        /* is this entry deleted? */
	if (internalsetitem(self, &new)) {
		return -1;
	}
	return 0;
}

static PyMappingMethods lazymanifest_mapping_methods = {
	(lenfunc)lazymanifest_size,             /* mp_length */
	(binaryfunc)lazymanifest_getitem,       /* mp_subscript */
	(objobjargproc)lazymanifest_setitem,    /* mp_ass_subscript */
};

/* sequence methods (important or __contains__ builds an iterator) */

static int lazymanifest_contains(lazymanifest *self, PyObject *key)
{
	line needle;
	line *hit;
	if (!PyBytes_Check(key)) {
		/* Our keys are always strings, so if the contains
		 * check is for a non-string, just return false. */
		return 0;
	}
	needle.start = PyBytes_AsString(key);
	hit = bsearch(&needle, self->lines, self->numlines, sizeof(line),
		      &linecmp);
	if (!hit || hit->deleted) {
		return 0;
	}
	return 1;
}

static PySequenceMethods lazymanifest_seq_meths = {
	(lenfunc)lazymanifest_size, /* sq_length */
	0, /* sq_concat */
	0, /* sq_repeat */
	0, /* sq_item */
	0, /* sq_slice */
	0, /* sq_ass_item */
	0, /* sq_ass_slice */
	(objobjproc)lazymanifest_contains, /* sq_contains */
	0, /* sq_inplace_concat */
	0, /* sq_inplace_repeat */
};


/* Other methods (copy, diff, etc) */
static PyTypeObject lazymanifestType;

/* If the manifest has changes, build the new manifest text and reindex it. */
static int compact(lazymanifest *self) {
	int i;
	ssize_t need = 0;
	char *data;
	line *src, *dst;
	PyObject *pydata;
	if (!self->dirty)
		return 0;
	for (i = 0; i < self->numlines; i++) {
		if (!self->lines[i].deleted) {
			need += self->lines[i].len;
		}
	}
	pydata = PyBytes_FromStringAndSize(NULL, need);
	if (!pydata)
		return -1;
	data = PyBytes_AsString(pydata);
	if (!data) {
		return -1;
	}
	src = self->lines;
	dst = self->lines;
	for (i = 0; i < self->numlines; i++, src++) {
		char *tofree = NULL;
		if (src->from_malloc) {
			tofree = src->start;
		}
		if (!src->deleted) {
			memcpy(data, src->start, src->len);
			*dst = *src;
			dst->start = data;
			dst->from_malloc = false;
			data += dst->len;
			dst++;
		}
		free(tofree);
	}
	Py_DECREF(self->pydata);
	self->pydata = pydata;
	self->numlines = self->livelines;
	self->dirty = false;
	return 0;
}

static PyObject *lazymanifest_text(lazymanifest *self)
{
	if (compact(self) != 0) {
		PyErr_NoMemory();
		return NULL;
	}
	Py_INCREF(self->pydata);
	return self->pydata;
}

static lazymanifest *lazymanifest_copy(lazymanifest *self)
{
	lazymanifest *copy = NULL;
	if (compact(self) != 0) {
		goto nomem;
	}
	copy = PyObject_New(lazymanifest, &lazymanifestType);
	if (!copy) {
		goto nomem;
	}
	copy->numlines = self->numlines;
	copy->livelines = self->livelines;
	copy->dirty = false;
	copy->lines = malloc(self->maxlines *sizeof(line));
	if (!copy->lines) {
		goto nomem;
	}
	memcpy(copy->lines, self->lines, self->numlines * sizeof(line));
	copy->maxlines = self->maxlines;
	copy->pydata = self->pydata;
	Py_INCREF(copy->pydata);
	return copy;
nomem:
	PyErr_NoMemory();
	Py_XDECREF(copy);
	return NULL;
}

static lazymanifest *lazymanifest_filtercopy(
	lazymanifest *self, PyObject *matchfn)
{
	lazymanifest *copy = NULL;
	int i;
	if (!PyCallable_Check(matchfn)) {
		PyErr_SetString(PyExc_TypeError, "matchfn must be callable");
		return NULL;
	}
	/* compact ourselves first to avoid double-frees later when we
	 * compact tmp so that it doesn't have random pointers to our
	 * underlying from_malloc-data (self->pydata is safe) */
	if (compact(self) != 0) {
		goto nomem;
	}
	copy = PyObject_New(lazymanifest, &lazymanifestType);
	if (!copy) {
		goto nomem;
	}
	copy->dirty = true;
	copy->lines = malloc(self->maxlines * sizeof(line));
	if (!copy->lines) {
		goto nomem;
	}
	copy->maxlines = self->maxlines;
	copy->numlines = 0;
	copy->pydata = self->pydata;
	Py_INCREF(self->pydata);
	for (i = 0; i < self->numlines; i++) {
		PyObject *arglist = NULL, *result = NULL;
		arglist = Py_BuildValue("(s)", self->lines[i].start);
		if (!arglist) {
			return NULL;
		}
		result = PyObject_CallObject(matchfn, arglist);
		Py_DECREF(arglist);
		/* if the callback raised an exception, just let it
		 * through and give up */
		if (!result) {
			free(copy->lines);
			Py_DECREF(self->pydata);
			return NULL;
		}
		if (PyObject_IsTrue(result)) {
			assert(!(self->lines[i].from_malloc));
			copy->lines[copy->numlines++] = self->lines[i];
		}
		Py_DECREF(result);
	}
	copy->livelines = copy->numlines;
	return copy;
nomem:
	PyErr_NoMemory();
	Py_XDECREF(copy);
	return NULL;
}

static PyObject *lazymanifest_diff(lazymanifest *self, PyObject *args)
{
	lazymanifest *other;
	PyObject *pyclean = NULL;
	bool listclean;
	PyObject *emptyTup = NULL, *ret = NULL;
	PyObject *es;
	int sneedle = 0, oneedle = 0;
	if (!PyArg_ParseTuple(args, "O!|O", &lazymanifestType, &other, &pyclean)) {
		return NULL;
	}
	listclean = (!pyclean) ? false : PyObject_IsTrue(pyclean);
	es = PyBytes_FromString("");
	if (!es) {
		goto nomem;
	}
	emptyTup = PyTuple_Pack(2, Py_None, es);
	Py_DECREF(es);
	if (!emptyTup) {
		goto nomem;
	}
	ret = PyDict_New();
	if (!ret) {
		goto nomem;
	}
	while (sneedle != self->numlines || oneedle != other->numlines) {
		line *left = self->lines + sneedle;
		line *right = other->lines + oneedle;
		int result;
		PyObject *key;
		PyObject *outer;
		/* If we're looking at a deleted entry and it's not
		 * the end of the manifest, just skip it. */
		if (left->deleted && sneedle < self->numlines) {
			sneedle++;
			continue;
		}
		if (right->deleted && oneedle < other->numlines) {
			oneedle++;
			continue;
		}
		/* if we're at the end of either manifest, then we
		 * know the remaining items are adds so we can skip
		 * the strcmp. */
		if (sneedle == self->numlines) {
			result = 1;
		} else if (oneedle == other->numlines) {
			result = -1;
		} else {
			result = linecmp(left, right);
		}
		key = result <= 0 ?
			PyBytes_FromString(left->start) :
			PyBytes_FromString(right->start);
		if (!key)
			goto nomem;
		if (result < 0) {
			PyObject *l = hashflags(left);
			if (!l) {
				goto nomem;
			}
			outer = PyTuple_Pack(2, l, emptyTup);
			Py_DECREF(l);
			if (!outer) {
				goto nomem;
			}
			PyDict_SetItem(ret, key, outer);
			Py_DECREF(outer);
			sneedle++;
		} else if (result > 0) {
			PyObject *r = hashflags(right);
			if (!r) {
				goto nomem;
			}
			outer = PyTuple_Pack(2, emptyTup, r);
			Py_DECREF(r);
			if (!outer) {
				goto nomem;
			}
			PyDict_SetItem(ret, key, outer);
			Py_DECREF(outer);
			oneedle++;
		} else {
			/* file exists in both manifests */
			if (left->len != right->len
			    || memcmp(left->start, right->start, left->len)
			    || left->hash_suffix != right->hash_suffix) {
				PyObject *l = hashflags(left);
				PyObject *r;
				if (!l) {
					goto nomem;
				}
				r = hashflags(right);
				if (!r) {
					Py_DECREF(l);
					goto nomem;
				}
				outer = PyTuple_Pack(2, l, r);
				Py_DECREF(l);
				Py_DECREF(r);
				if (!outer) {
					goto nomem;
				}
				PyDict_SetItem(ret, key, outer);
				Py_DECREF(outer);
			} else if (listclean) {
				PyDict_SetItem(ret, key, Py_None);
			}
			sneedle++;
			oneedle++;
		}
		Py_DECREF(key);
	}
	Py_DECREF(emptyTup);
	return ret;
nomem:
	PyErr_NoMemory();
	Py_XDECREF(ret);
	Py_XDECREF(emptyTup);
	return NULL;
}

static PyMethodDef lazymanifest_methods[] = {
	{"iterkeys", (PyCFunction)lazymanifest_getkeysiter, METH_NOARGS,
	 "Iterate over file names in this lazymanifest."},
	{"iterentries", (PyCFunction)lazymanifest_getentriesiter, METH_NOARGS,
	 "Iterate over (path, nodeid, flags) tuples in this lazymanifest."},
	{"copy", (PyCFunction)lazymanifest_copy, METH_NOARGS,
	 "Make a copy of this lazymanifest."},
	{"filtercopy", (PyCFunction)lazymanifest_filtercopy, METH_O,
	 "Make a copy of this manifest filtered by matchfn."},
	{"diff", (PyCFunction)lazymanifest_diff, METH_VARARGS,
	 "Compare this lazymanifest to another one."},
	{"text", (PyCFunction)lazymanifest_text, METH_NOARGS,
	 "Encode this manifest to text."},
	{NULL},
};

#ifdef IS_PY3K
#define LAZYMANIFEST_TPFLAGS Py_TPFLAGS_DEFAULT
#else
#define LAZYMANIFEST_TPFLAGS Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_SEQUENCE_IN
#endif

static PyTypeObject lazymanifestType = {
	PyVarObject_HEAD_INIT(NULL, 0)
	"parsers.lazymanifest",                           /* tp_name */
	sizeof(lazymanifest),                             /* tp_basicsize */
	0,                                                /* tp_itemsize */
	(destructor)lazymanifest_dealloc,                 /* tp_dealloc */
	0,                                                /* tp_print */
	0,                                                /* tp_getattr */
	0,                                                /* tp_setattr */
	0,                                                /* tp_compare */
	0,                                                /* tp_repr */
	0,                                                /* tp_as_number */
	&lazymanifest_seq_meths,                          /* tp_as_sequence */
	&lazymanifest_mapping_methods,                    /* tp_as_mapping */
	0,                                                /* tp_hash */
	0,                                                /* tp_call */
	0,                                                /* tp_str */
	0,                                                /* tp_getattro */
	0,                                                /* tp_setattro */
	0,                                                /* tp_as_buffer */
	LAZYMANIFEST_TPFLAGS,                             /* tp_flags */
	"TODO(augie)",                                    /* tp_doc */
	0,                                                /* tp_traverse */
	0,                                                /* tp_clear */
	0,                                                /* tp_richcompare */
	0,                                             /* tp_weaklistoffset */
	(getiterfunc)lazymanifest_getkeysiter,                /* tp_iter */
	0,                                                /* tp_iternext */
	lazymanifest_methods,                             /* tp_methods */
	0,                                                /* tp_members */
	0,                                                /* tp_getset */
	0,                                                /* tp_base */
	0,                                                /* tp_dict */
	0,                                                /* tp_descr_get */
	0,                                                /* tp_descr_set */
	0,                                                /* tp_dictoffset */
	(initproc)lazymanifest_init,                      /* tp_init */
	0,                                                /* tp_alloc */
};

void manifest_module_init(PyObject * mod)
{
	lazymanifestType.tp_new = PyType_GenericNew;
	if (PyType_Ready(&lazymanifestType) < 0)
		return;
	Py_INCREF(&lazymanifestType);

	PyModule_AddObject(mod, "lazymanifest",
			   (PyObject *)&lazymanifestType);
}