/*
parsers.c - efficient content parsing
Copyright 2008 Matt Mackall <mpm@selenic.com> and others
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 <ctype.h>
#include <stddef.h>
#include <string.h>
#include "util.h"
static inline int hexdigit(const char *p, Py_ssize_t off)
{
char c = p[off];
if (c >= '0' && c <= '9')
return c - '0';
if (c >= 'a' && c <= 'f')
return c - 'a' + 10;
if (c >= 'A' && c <= 'F')
return c - 'A' + 10;
PyErr_SetString(PyExc_ValueError, "input contains non-hex character");
return 0;
}
/*
* Turn a hex-encoded string into binary.
*/
static PyObject *unhexlify(const char *str, int len)
{
PyObject *ret;
char *d;
int i;
ret = PyBytes_FromStringAndSize(NULL, len / 2);
if (!ret)
return NULL;
d = PyBytes_AsString(ret);
for (i = 0; i < len;) {
int hi = hexdigit(str, i++);
int lo = hexdigit(str, i++);
*d++ = (hi << 4) | lo;
}
return ret;
}
/*
* This code assumes that a manifest is stitched together with newline
* ('\n') characters.
*/
static PyObject *parse_manifest(PyObject *self, PyObject *args)
{
PyObject *mfdict, *fdict;
char *str, *cur, *start, *zero;
int len;
if (!PyArg_ParseTuple(args, "O!O!s#:parse_manifest",
&PyDict_Type, &mfdict,
&PyDict_Type, &fdict,
&str, &len))
goto quit;
for (start = cur = str, zero = NULL; cur < str + len; cur++) {
PyObject *file = NULL, *node = NULL;
PyObject *flags = NULL;
ptrdiff_t nlen;
if (!*cur) {
zero = cur;
continue;
}
else if (*cur != '\n')
continue;
if (!zero) {
PyErr_SetString(PyExc_ValueError,
"manifest entry has no separator");
goto quit;
}
file = PyBytes_FromStringAndSize(start, zero - start);
if (!file)
goto bail;
nlen = cur - zero - 1;
node = unhexlify(zero + 1, nlen > 40 ? 40 : (int)nlen);
if (!node)
goto bail;
if (nlen > 40) {
flags = PyBytes_FromStringAndSize(zero + 41,
nlen - 40);
if (!flags)
goto bail;
if (PyDict_SetItem(fdict, file, flags) == -1)
goto bail;
}
if (PyDict_SetItem(mfdict, file, node) == -1)
goto bail;
start = cur + 1;
zero = NULL;
Py_XDECREF(flags);
Py_XDECREF(node);
Py_XDECREF(file);
continue;
bail:
Py_XDECREF(flags);
Py_XDECREF(node);
Py_XDECREF(file);
goto quit;
}
if (len > 0 && *(cur - 1) != '\n') {
PyErr_SetString(PyExc_ValueError,
"manifest contains trailing garbage");
goto quit;
}
Py_INCREF(Py_None);
return Py_None;
quit:
return NULL;
}
static PyObject *parse_dirstate(PyObject *self, PyObject *args)
{
PyObject *dmap, *cmap, *parents = NULL, *ret = NULL;
PyObject *fname = NULL, *cname = NULL, *entry = NULL;
char *str, *cur, *end, *cpos;
int state, mode, size, mtime;
unsigned int flen;
int len;
if (!PyArg_ParseTuple(args, "O!O!s#:parse_dirstate",
&PyDict_Type, &dmap,
&PyDict_Type, &cmap,
&str, &len))
goto quit;
/* read parents */
if (len < 40)
goto quit;
parents = Py_BuildValue("s#s#", str, 20, str + 20, 20);
if (!parents)
goto quit;
/* read filenames */
cur = str + 40;
end = str + len;
while (cur < end - 17) {
/* unpack header */
state = *cur;
mode = getbe32(cur + 1);
size = getbe32(cur + 5);
mtime = getbe32(cur + 9);
flen = getbe32(cur + 13);
cur += 17;
if (cur + flen > end || cur + flen < cur) {
PyErr_SetString(PyExc_ValueError, "overflow in dirstate");
goto quit;
}
entry = Py_BuildValue("ciii", state, mode, size, mtime);
if (!entry)
goto quit;
PyObject_GC_UnTrack(entry); /* don't waste time with this */
cpos = memchr(cur, 0, flen);
if (cpos) {
fname = PyBytes_FromStringAndSize(cur, cpos - cur);
cname = PyBytes_FromStringAndSize(cpos + 1,
flen - (cpos - cur) - 1);
if (!fname || !cname ||
PyDict_SetItem(cmap, fname, cname) == -1 ||
PyDict_SetItem(dmap, fname, entry) == -1)
goto quit;
Py_DECREF(cname);
} else {
fname = PyBytes_FromStringAndSize(cur, flen);
if (!fname ||
PyDict_SetItem(dmap, fname, entry) == -1)
goto quit;
}
cur += flen;
Py_DECREF(fname);
Py_DECREF(entry);
fname = cname = entry = NULL;
}
ret = parents;
Py_INCREF(ret);
quit:
Py_XDECREF(fname);
Py_XDECREF(cname);
Py_XDECREF(entry);
Py_XDECREF(parents);
return ret;
}
static inline int getintat(PyObject *tuple, int off, uint32_t *v)
{
PyObject *o = PyTuple_GET_ITEM(tuple, off);
long val;
if (PyInt_Check(o))
val = PyInt_AS_LONG(o);
else if (PyLong_Check(o)) {
val = PyLong_AsLong(o);
if (val == -1 && PyErr_Occurred())
return -1;
} else {
PyErr_SetString(PyExc_TypeError, "expected an int or long");
return -1;
}
if (LONG_MAX > INT_MAX && (val > INT_MAX || val < INT_MIN)) {
PyErr_SetString(PyExc_OverflowError,
"Python value to large to convert to uint32_t");
return -1;
}
*v = (uint32_t)val;
return 0;
}
static PyObject *dirstate_unset;
/*
* Efficiently pack a dirstate object into its on-disk format.
*/
static PyObject *pack_dirstate(PyObject *self, PyObject *args)
{
PyObject *packobj = NULL;
PyObject *map, *copymap, *pl;
Py_ssize_t nbytes, pos, l;
PyObject *k, *v, *pn;
char *p, *s;
double now;
if (!PyArg_ParseTuple(args, "O!O!Od:pack_dirstate",
&PyDict_Type, &map, &PyDict_Type, ©map,
&pl, &now))
return NULL;
if (!PySequence_Check(pl) || PySequence_Size(pl) != 2) {
PyErr_SetString(PyExc_TypeError, "expected 2-element sequence");
return NULL;
}
/* Figure out how much we need to allocate. */
for (nbytes = 40, pos = 0; PyDict_Next(map, &pos, &k, &v);) {
PyObject *c;
if (!PyString_Check(k)) {
PyErr_SetString(PyExc_TypeError, "expected string key");
goto bail;
}
nbytes += PyString_GET_SIZE(k) + 17;
c = PyDict_GetItem(copymap, k);
if (c) {
if (!PyString_Check(c)) {
PyErr_SetString(PyExc_TypeError,
"expected string key");
goto bail;
}
nbytes += PyString_GET_SIZE(c) + 1;
}
}
packobj = PyString_FromStringAndSize(NULL, nbytes);
if (packobj == NULL)
goto bail;
p = PyString_AS_STRING(packobj);
pn = PySequence_ITEM(pl, 0);
if (PyString_AsStringAndSize(pn, &s, &l) == -1 || l != 20) {
PyErr_SetString(PyExc_TypeError, "expected a 20-byte hash");
goto bail;
}
memcpy(p, s, l);
p += 20;
pn = PySequence_ITEM(pl, 1);
if (PyString_AsStringAndSize(pn, &s, &l) == -1 || l != 20) {
PyErr_SetString(PyExc_TypeError, "expected a 20-byte hash");
goto bail;
}
memcpy(p, s, l);
p += 20;
for (pos = 0; PyDict_Next(map, &pos, &k, &v); ) {
uint32_t mode, size, mtime;
Py_ssize_t len, l;
PyObject *o;
char *s, *t;
if (!PyTuple_Check(v) || PyTuple_GET_SIZE(v) != 4) {
PyErr_SetString(PyExc_TypeError, "expected a 4-tuple");
goto bail;
}
o = PyTuple_GET_ITEM(v, 0);
if (PyString_AsStringAndSize(o, &s, &l) == -1 || l != 1) {
PyErr_SetString(PyExc_TypeError, "expected one byte");
goto bail;
}
*p++ = *s;
if (getintat(v, 1, &mode) == -1)
goto bail;
if (getintat(v, 2, &size) == -1)
goto bail;
if (getintat(v, 3, &mtime) == -1)
goto bail;
if (*s == 'n' && mtime == (uint32_t)now) {
/* See pure/parsers.py:pack_dirstate for why we do
* this. */
if (PyDict_SetItem(map, k, dirstate_unset) == -1)
goto bail;
mode = 0, size = -1, mtime = -1;
}
putbe32(mode, p);
putbe32(size, p + 4);
putbe32(mtime, p + 8);
t = p + 12;
p += 16;
len = PyString_GET_SIZE(k);
memcpy(p, PyString_AS_STRING(k), len);
p += len;
o = PyDict_GetItem(copymap, k);
if (o) {
*p++ = '\0';
l = PyString_GET_SIZE(o);
memcpy(p, PyString_AS_STRING(o), l);
p += l;
len += l + 1;
}
putbe32((uint32_t)len, t);
}
pos = p - PyString_AS_STRING(packobj);
if (pos != nbytes) {
PyErr_Format(PyExc_SystemError, "bad dirstate size: %ld != %ld",
(long)pos, (long)nbytes);
goto bail;
}
return packobj;
bail:
Py_XDECREF(packobj);
return NULL;
}
/*
* A base-16 trie for fast node->rev mapping.
*
* Positive value is index of the next node in the trie
* Negative value is a leaf: -(rev + 1)
* Zero is empty
*/
typedef struct {
int children[16];
} nodetree;
/*
* This class has two behaviours.
*
* When used in a list-like way (with integer keys), we decode an
* entry in a RevlogNG index file on demand. Our last entry is a
* sentinel, always a nullid. We have limited support for
* integer-keyed insert and delete, only at elements right before the
* sentinel.
*
* With string keys, we lazily perform a reverse mapping from node to
* rev, using a base-16 trie.
*/
typedef struct {
PyObject_HEAD
/* Type-specific fields go here. */
PyObject *data; /* raw bytes of index */
PyObject **cache; /* cached tuples */
const char **offsets; /* populated on demand */
Py_ssize_t raw_length; /* original number of elements */
Py_ssize_t length; /* current number of elements */
PyObject *added; /* populated on demand */
PyObject *headrevs; /* cache, invalidated on changes */
nodetree *nt; /* base-16 trie */
int ntlength; /* # nodes in use */
int ntcapacity; /* # nodes allocated */
int ntdepth; /* maximum depth of tree */
int ntsplits; /* # splits performed */
int ntrev; /* last rev scanned */
int ntlookups; /* # lookups */
int ntmisses; /* # lookups that miss the cache */
int inlined;
} indexObject;
static Py_ssize_t index_length(const indexObject *self)
{
if (self->added == NULL)
return self->length;
return self->length + PyList_GET_SIZE(self->added);
}
static PyObject *nullentry;
static const char nullid[20];
static long inline_scan(indexObject *self, const char **offsets);
#if LONG_MAX == 0x7fffffffL
static char *tuple_format = "Kiiiiiis#";
#else
static char *tuple_format = "kiiiiiis#";
#endif
/* A RevlogNG v1 index entry is 64 bytes long. */
static const long v1_hdrsize = 64;
/*
* Return a pointer to the beginning of a RevlogNG record.
*/
static const char *index_deref(indexObject *self, Py_ssize_t pos)
{
if (self->inlined && pos > 0) {
if (self->offsets == NULL) {
self->offsets = malloc(self->raw_length *
sizeof(*self->offsets));
if (self->offsets == NULL)
return (const char *)PyErr_NoMemory();
inline_scan(self, self->offsets);
}
return self->offsets[pos];
}
return PyString_AS_STRING(self->data) + pos * v1_hdrsize;
}
/*
* RevlogNG format (all in big endian, data may be inlined):
* 6 bytes: offset
* 2 bytes: flags
* 4 bytes: compressed length
* 4 bytes: uncompressed length
* 4 bytes: base revision
* 4 bytes: link revision
* 4 bytes: parent 1 revision
* 4 bytes: parent 2 revision
* 32 bytes: nodeid (only 20 bytes used)
*/
static PyObject *index_get(indexObject *self, Py_ssize_t pos)
{
uint64_t offset_flags;
int comp_len, uncomp_len, base_rev, link_rev, parent_1, parent_2;
const char *c_node_id;
const char *data;
Py_ssize_t length = index_length(self);
PyObject *entry;
if (pos < 0)
pos += length;
if (pos < 0 || pos >= length) {
PyErr_SetString(PyExc_IndexError, "revlog index out of range");
return NULL;
}
if (pos == length - 1) {
Py_INCREF(nullentry);
return nullentry;
}
if (pos >= self->length - 1) {
PyObject *obj;
obj = PyList_GET_ITEM(self->added, pos - self->length + 1);
Py_INCREF(obj);
return obj;
}
if (self->cache) {
if (self->cache[pos]) {
Py_INCREF(self->cache[pos]);
return self->cache[pos];
}
} else {
self->cache = calloc(self->raw_length, sizeof(PyObject *));
if (self->cache == NULL)
return PyErr_NoMemory();
}
data = index_deref(self, pos);
if (data == NULL)
return NULL;
offset_flags = getbe32(data + 4);
if (pos == 0) /* mask out version number for the first entry */
offset_flags &= 0xFFFF;
else {
uint32_t offset_high = getbe32(data);
offset_flags |= ((uint64_t)offset_high) << 32;
}
comp_len = getbe32(data + 8);
uncomp_len = getbe32(data + 12);
base_rev = getbe32(data + 16);
link_rev = getbe32(data + 20);
parent_1 = getbe32(data + 24);
parent_2 = getbe32(data + 28);
c_node_id = data + 32;
entry = Py_BuildValue(tuple_format, offset_flags, comp_len,
uncomp_len, base_rev, link_rev,
parent_1, parent_2, c_node_id, 20);
if (entry)
PyObject_GC_UnTrack(entry);
self->cache[pos] = entry;
Py_INCREF(entry);
return entry;
}
/*
* Return the 20-byte SHA of the node corresponding to the given rev.
*/
static const char *index_node(indexObject *self, Py_ssize_t pos)
{
Py_ssize_t length = index_length(self);
const char *data;
if (pos == length - 1 || pos == INT_MAX)
return nullid;
if (pos >= length)
return NULL;
if (pos >= self->length - 1) {
PyObject *tuple, *str;
tuple = PyList_GET_ITEM(self->added, pos - self->length + 1);
str = PyTuple_GetItem(tuple, 7);
return str ? PyString_AS_STRING(str) : NULL;
}
data = index_deref(self, pos);
return data ? data + 32 : NULL;
}
static int nt_insert(indexObject *self, const char *node, int rev);
static int node_check(PyObject *obj, char **node, Py_ssize_t *nodelen)
{
if (PyString_AsStringAndSize(obj, node, nodelen) == -1)
return -1;
if (*nodelen == 20)
return 0;
PyErr_SetString(PyExc_ValueError, "20-byte hash required");
return -1;
}
static PyObject *index_insert(indexObject *self, PyObject *args)
{
PyObject *obj;
char *node;
long offset;
Py_ssize_t len, nodelen;
if (!PyArg_ParseTuple(args, "lO", &offset, &obj))
return NULL;
if (!PyTuple_Check(obj) || PyTuple_GET_SIZE(obj) != 8) {
PyErr_SetString(PyExc_TypeError, "8-tuple required");
return NULL;
}
if (node_check(PyTuple_GET_ITEM(obj, 7), &node, &nodelen) == -1)
return NULL;
len = index_length(self);
if (offset < 0)
offset += len;
if (offset != len - 1) {
PyErr_SetString(PyExc_IndexError,
"insert only supported at index -1");
return NULL;
}
if (offset > INT_MAX) {
PyErr_SetString(PyExc_ValueError,
"currently only 2**31 revs supported");
return NULL;
}
if (self->added == NULL) {
self->added = PyList_New(0);
if (self->added == NULL)
return NULL;
}
if (PyList_Append(self->added, obj) == -1)
return NULL;
if (self->nt)
nt_insert(self, node, (int)offset);
Py_CLEAR(self->headrevs);
Py_RETURN_NONE;
}
static void _index_clearcaches(indexObject *self)
{
if (self->cache) {
Py_ssize_t i;
for (i = 0; i < self->raw_length; i++)
Py_CLEAR(self->cache[i]);
free(self->cache);
self->cache = NULL;
}
if (self->offsets) {
free(self->offsets);
self->offsets = NULL;
}
if (self->nt) {
free(self->nt);
self->nt = NULL;
}
Py_CLEAR(self->headrevs);
}
static PyObject *index_clearcaches(indexObject *self)
{
_index_clearcaches(self);
self->ntlength = self->ntcapacity = 0;
self->ntdepth = self->ntsplits = 0;
self->ntrev = -1;
self->ntlookups = self->ntmisses = 0;
Py_RETURN_NONE;
}
static PyObject *index_stats(indexObject *self)
{
PyObject *obj = PyDict_New();
if (obj == NULL)
return NULL;
#define istat(__n, __d) \
if (PyDict_SetItemString(obj, __d, PyInt_FromSsize_t(self->__n)) == -1) \
goto bail;
if (self->added) {
Py_ssize_t len = PyList_GET_SIZE(self->added);
if (PyDict_SetItemString(obj, "index entries added",
PyInt_FromSsize_t(len)) == -1)
goto bail;
}
if (self->raw_length != self->length - 1)
istat(raw_length, "revs on disk");
istat(length, "revs in memory");
istat(ntcapacity, "node trie capacity");
istat(ntdepth, "node trie depth");
istat(ntlength, "node trie count");
istat(ntlookups, "node trie lookups");
istat(ntmisses, "node trie misses");
istat(ntrev, "node trie last rev scanned");
istat(ntsplits, "node trie splits");
#undef istat
return obj;
bail:
Py_XDECREF(obj);
return NULL;
}
/*
* When we cache a list, we want to be sure the caller can't mutate
* the cached copy.
*/
static PyObject *list_copy(PyObject *list)
{
Py_ssize_t len = PyList_GET_SIZE(list);
PyObject *newlist = PyList_New(len);
Py_ssize_t i;
if (newlist == NULL)
return NULL;
for (i = 0; i < len; i++) {
PyObject *obj = PyList_GET_ITEM(list, i);
Py_INCREF(obj);
PyList_SET_ITEM(newlist, i, obj);
}
return newlist;
}
static PyObject *index_headrevs(indexObject *self)
{
Py_ssize_t i, len, addlen;
char *nothead = NULL;
PyObject *heads;
if (self->headrevs)
return list_copy(self->headrevs);
len = index_length(self) - 1;
heads = PyList_New(0);
if (heads == NULL)
goto bail;
if (len == 0) {
PyObject *nullid = PyInt_FromLong(-1);
if (nullid == NULL || PyList_Append(heads, nullid) == -1) {
Py_XDECREF(nullid);
goto bail;
}
goto done;
}
nothead = calloc(len, 1);
if (nothead == NULL)
goto bail;
for (i = 0; i < self->raw_length; i++) {
const char *data = index_deref(self, i);
int parent_1 = getbe32(data + 24);
int parent_2 = getbe32(data + 28);
if (parent_1 >= 0)
nothead[parent_1] = 1;
if (parent_2 >= 0)
nothead[parent_2] = 1;
}
addlen = self->added ? PyList_GET_SIZE(self->added) : 0;
for (i = 0; i < addlen; i++) {
PyObject *rev = PyList_GET_ITEM(self->added, i);
PyObject *p1 = PyTuple_GET_ITEM(rev, 5);
PyObject *p2 = PyTuple_GET_ITEM(rev, 6);
long parent_1, parent_2;
if (!PyInt_Check(p1) || !PyInt_Check(p2)) {
PyErr_SetString(PyExc_TypeError,
"revlog parents are invalid");
goto bail;
}
parent_1 = PyInt_AS_LONG(p1);
parent_2 = PyInt_AS_LONG(p2);
if (parent_1 >= 0)
nothead[parent_1] = 1;
if (parent_2 >= 0)
nothead[parent_2] = 1;
}
for (i = 0; i < len; i++) {
PyObject *head;
if (nothead[i])
continue;
head = PyInt_FromLong(i);
if (head == NULL || PyList_Append(heads, head) == -1) {
Py_XDECREF(head);
goto bail;
}
}
done:
self->headrevs = heads;
free(nothead);
return list_copy(self->headrevs);
bail:
Py_XDECREF(heads);
free(nothead);
return NULL;
}
static inline int nt_level(const char *node, Py_ssize_t level)
{
int v = node[level>>1];
if (!(level & 1))
v >>= 4;
return v & 0xf;
}
/*
* Return values:
*
* -4: match is ambiguous (multiple candidates)
* -2: not found
* rest: valid rev
*/
static int nt_find(indexObject *self, const char *node, Py_ssize_t nodelen,
int hex)
{
int (*getnybble)(const char *, Py_ssize_t) = hex ? hexdigit : nt_level;
int level, maxlevel, off;
if (nodelen == 20 && node[0] == '\0' && memcmp(node, nullid, 20) == 0)
return -1;
if (self->nt == NULL)
return -2;
if (hex)
maxlevel = nodelen > 40 ? 40 : (int)nodelen;
else
maxlevel = nodelen > 20 ? 40 : ((int)nodelen * 2);
for (level = off = 0; level < maxlevel; level++) {
int k = getnybble(node, level);
nodetree *n = &self->nt[off];
int v = n->children[k];
if (v < 0) {
const char *n;
Py_ssize_t i;
v = -v - 1;
n = index_node(self, v);
if (n == NULL)
return -2;
for (i = level; i < maxlevel; i++)
if (getnybble(node, i) != nt_level(n, i))
return -2;
return v;
}
if (v == 0)
return -2;
off = v;
}
/* multiple matches against an ambiguous prefix */
return -4;
}
static int nt_new(indexObject *self)
{
if (self->ntlength == self->ntcapacity) {
self->ntcapacity *= 2;
self->nt = realloc(self->nt,
self->ntcapacity * sizeof(nodetree));
if (self->nt == NULL) {
PyErr_SetString(PyExc_MemoryError, "out of memory");
return -1;
}
memset(&self->nt[self->ntlength], 0,
sizeof(nodetree) * (self->ntcapacity - self->ntlength));
}
return self->ntlength++;
}
static int nt_insert(indexObject *self, const char *node, int rev)
{
int level = 0;
int off = 0;
while (level < 40) {
int k = nt_level(node, level);
nodetree *n;
int v;
n = &self->nt[off];
v = n->children[k];
if (v == 0) {
n->children[k] = -rev - 1;
return 0;
}
if (v < 0) {
const char *oldnode = index_node(self, -v - 1);
int noff;
if (!oldnode || !memcmp(oldnode, node, 20)) {
n->children[k] = -rev - 1;
return 0;
}
noff = nt_new(self);
if (noff == -1)
return -1;
/* self->nt may have been changed by realloc */
self->nt[off].children[k] = noff;
off = noff;
n = &self->nt[off];
n->children[nt_level(oldnode, ++level)] = v;
if (level > self->ntdepth)
self->ntdepth = level;
self->ntsplits += 1;
} else {
level += 1;
off = v;
}
}
return -1;
}
static int nt_init(indexObject *self)
{
if (self->nt == NULL) {
self->ntcapacity = self->raw_length < 4
? 4 : self->raw_length / 2;
self->nt = calloc(self->ntcapacity, sizeof(nodetree));
if (self->nt == NULL) {
PyErr_NoMemory();
return -1;
}
self->ntlength = 1;
self->ntrev = (int)index_length(self) - 1;
self->ntlookups = 1;
self->ntmisses = 0;
if (nt_insert(self, nullid, INT_MAX) == -1)
return -1;
}
return 0;
}
/*
* Return values:
*
* -3: error (exception set)
* -2: not found (no exception set)
* rest: valid rev
*/
static int index_find_node(indexObject *self,
const char *node, Py_ssize_t nodelen)
{
int rev;
self->ntlookups++;
rev = nt_find(self, node, nodelen, 0);
if (rev >= -1)
return rev;
if (nt_init(self) == -1)
return -3;
/*
* For the first handful of lookups, we scan the entire index,
* and cache only the matching nodes. This optimizes for cases
* like "hg tip", where only a few nodes are accessed.
*
* After that, we cache every node we visit, using a single
* scan amortized over multiple lookups. This gives the best
* bulk performance, e.g. for "hg log".
*/
if (self->ntmisses++ < 4) {
for (rev = self->ntrev - 1; rev >= 0; rev--) {
const char *n = index_node(self, rev);
if (n == NULL)
return -2;
if (memcmp(node, n, nodelen > 20 ? 20 : nodelen) == 0) {
if (nt_insert(self, n, rev) == -1)
return -3;
break;
}
}
} else {
for (rev = self->ntrev - 1; rev >= 0; rev--) {
const char *n = index_node(self, rev);
if (n == NULL) {
self->ntrev = rev + 1;
return -2;
}
if (nt_insert(self, n, rev) == -1) {
self->ntrev = rev + 1;
return -3;
}
if (memcmp(node, n, nodelen > 20 ? 20 : nodelen) == 0) {
break;
}
}
self->ntrev = rev;
}
if (rev >= 0)
return rev;
return -2;
}
static PyObject *raise_revlog_error(void)
{
static PyObject *errclass;
PyObject *mod = NULL, *errobj;
if (errclass == NULL) {
PyObject *dict;
mod = PyImport_ImportModule("mercurial.error");
if (mod == NULL)
goto classfail;
dict = PyModule_GetDict(mod);
if (dict == NULL)
goto classfail;
errclass = PyDict_GetItemString(dict, "RevlogError");
if (errclass == NULL) {
PyErr_SetString(PyExc_SystemError,
"could not find RevlogError");
goto classfail;
}
Py_INCREF(errclass);
}
errobj = PyObject_CallFunction(errclass, NULL);
if (errobj == NULL)
return NULL;
PyErr_SetObject(errclass, errobj);
return errobj;
classfail:
Py_XDECREF(mod);
return NULL;
}
static PyObject *index_getitem(indexObject *self, PyObject *value)
{
char *node;
Py_ssize_t nodelen;
int rev;
if (PyInt_Check(value))
return index_get(self, PyInt_AS_LONG(value));
if (node_check(value, &node, &nodelen) == -1)
return NULL;
rev = index_find_node(self, node, nodelen);
if (rev >= -1)
return PyInt_FromLong(rev);
if (rev == -2)
raise_revlog_error();
return NULL;
}
static int nt_partialmatch(indexObject *self, const char *node,
Py_ssize_t nodelen)
{
int rev;
if (nt_init(self) == -1)
return -3;
if (self->ntrev > 0) {
/* ensure that the radix tree is fully populated */
for (rev = self->ntrev - 1; rev >= 0; rev--) {
const char *n = index_node(self, rev);
if (n == NULL)
return -2;
if (nt_insert(self, n, rev) == -1)
return -3;
}
self->ntrev = rev;
}
return nt_find(self, node, nodelen, 1);
}
static PyObject *index_partialmatch(indexObject *self, PyObject *args)
{
const char *fullnode;
int nodelen;
char *node;
int rev, i;
if (!PyArg_ParseTuple(args, "s#", &node, &nodelen))
return NULL;
if (nodelen < 4) {
PyErr_SetString(PyExc_ValueError, "key too short");
return NULL;
}
if (nodelen > 40) {
PyErr_SetString(PyExc_ValueError, "key too long");
return NULL;
}
for (i = 0; i < nodelen; i++)
hexdigit(node, i);
if (PyErr_Occurred()) {
/* input contains non-hex characters */
PyErr_Clear();
Py_RETURN_NONE;
}
rev = nt_partialmatch(self, node, nodelen);
switch (rev) {
case -4:
raise_revlog_error();
case -3:
return NULL;
case -2:
Py_RETURN_NONE;
case -1:
return PyString_FromStringAndSize(nullid, 20);
}
fullnode = index_node(self, rev);
if (fullnode == NULL) {
PyErr_Format(PyExc_IndexError,
"could not access rev %d", rev);
return NULL;
}
return PyString_FromStringAndSize(fullnode, 20);
}
static PyObject *index_m_get(indexObject *self, PyObject *args)
{
Py_ssize_t nodelen;
PyObject *val;
char *node;
int rev;
if (!PyArg_ParseTuple(args, "O", &val))
return NULL;
if (node_check(val, &node, &nodelen) == -1)
return NULL;
rev = index_find_node(self, node, nodelen);
if (rev == -3)
return NULL;
if (rev == -2)
Py_RETURN_NONE;
return PyInt_FromLong(rev);
}
static int index_contains(indexObject *self, PyObject *value)
{
char *node;
Py_ssize_t nodelen;
if (PyInt_Check(value)) {
long rev = PyInt_AS_LONG(value);
return rev >= -1 && rev < index_length(self);
}
if (node_check(value, &node, &nodelen) == -1)
return -1;
switch (index_find_node(self, node, nodelen)) {
case -3:
return -1;
case -2:
return 0;
default:
return 1;
}
}
static inline void index_get_parents(indexObject *self, int rev, int *ps)
{
if (rev >= self->length - 1) {
PyObject *tuple = PyList_GET_ITEM(self->added,
rev - self->length + 1);
ps[0] = (int)PyInt_AS_LONG(PyTuple_GET_ITEM(tuple, 5));
ps[1] = (int)PyInt_AS_LONG(PyTuple_GET_ITEM(tuple, 6));
} else {
const char *data = index_deref(self, rev);
ps[0] = getbe32(data + 24);
ps[1] = getbe32(data + 28);
}
}
typedef uint64_t bitmask;
/*
* Given a disjoint set of revs, return all candidates for the
* greatest common ancestor. In revset notation, this is the set
* "heads(::a and ::b and ...)"
*/
static PyObject *find_gca_candidates(indexObject *self, const int *revs,
int revcount)
{
const bitmask allseen = (1ull << revcount) - 1;
const bitmask poison = 1ull << revcount;
PyObject *gca = PyList_New(0);
int i, v, interesting, left;
int maxrev = -1;
bitmask *seen;
for (i = 0; i < revcount; i++) {
if (revs[i] > maxrev)
maxrev = revs[i];
}
seen = calloc(sizeof(*seen), maxrev + 1);
if (seen == NULL)
return PyErr_NoMemory();
for (i = 0; i < revcount; i++)
seen[revs[i]] = 1ull << i;
interesting = left = revcount;
for (v = maxrev; v >= 0 && interesting; v--) {
long sv = seen[v];
int parents[2];
if (!sv)
continue;
if (sv < poison) {
interesting -= 1;
if (sv == allseen) {
PyObject *obj = PyInt_FromLong(v);
if (obj == NULL)
goto bail;
if (PyList_Append(gca, obj) == -1) {
Py_DECREF(obj);
goto bail;
}
sv |= poison;
for (i = 0; i < revcount; i++) {
if (revs[i] == v) {
if (--left <= 1)
goto done;
break;
}
}
}
}
index_get_parents(self, v, parents);
for (i = 0; i < 2; i++) {
int p = parents[i];
if (p == -1)
continue;
const long sp = seen[p];
if (sv < poison) {
if (sp == 0) {
seen[p] = sv;
interesting++;
}
else if (sp != sv)
seen[p] |= sv;
} else {
if (sp && sp < poison)
interesting--;
seen[p] = sv;
}
}
}
done:
free(seen);
return gca;
bail:
free(seen);
Py_XDECREF(gca);
return NULL;
}
/*
* Given a disjoint set of revs, return the subset with the longest
* path to the root.
*/
static PyObject *find_deepest(indexObject *self, PyObject *revs)
{
const Py_ssize_t revcount = PyList_GET_SIZE(revs);
static const Py_ssize_t capacity = 24;
int *depth, *interesting = NULL;
int i, j, v, ninteresting;
PyObject *dict = NULL, *keys;
long *seen = NULL;
int maxrev = -1;
long final;
if (revcount > capacity) {
PyErr_Format(PyExc_OverflowError,
"bitset size (%ld) > capacity (%ld)",
revcount, capacity);
return NULL;
}
for (i = 0; i < revcount; i++) {
int n = (int)PyInt_AsLong(PyList_GET_ITEM(revs, i));
if (n > maxrev)
maxrev = n;
}
depth = calloc(sizeof(*depth), maxrev + 1);
if (depth == NULL)
return PyErr_NoMemory();
seen = calloc(sizeof(*seen), maxrev + 1);
if (seen == NULL) {
PyErr_NoMemory();
goto bail;
}
interesting = calloc(sizeof(*interesting), 2 << revcount);
if (interesting == NULL) {
PyErr_NoMemory();
goto bail;
}
for (i = 0; i < revcount; i++) {
int n = (int)PyInt_AsLong(PyList_GET_ITEM(revs, i));
long b = 1l << i;
depth[n] = 1;
seen[n] = b;
interesting[b] = 1;
}
ninteresting = (int)revcount;
for (v = maxrev; v >= 0 && ninteresting > 1; v--) {
int dv = depth[v];
int parents[2];
long sv;
if (dv == 0)
continue;
sv = seen[v];
index_get_parents(self, v, parents);
for (i = 0; i < 2; i++) {
int p = parents[i];
long nsp, sp;
int dp;
if (p == -1)
continue;
dp = depth[p];
nsp = sp = seen[p];
if (dp <= dv) {
depth[p] = dv + 1;
if (sp != sv) {
interesting[sv] += 1;
nsp = seen[p] = sv;
if (sp) {
interesting[sp] -= 1;
if (interesting[sp] == 0)
ninteresting -= 1;
}
}
}
else if (dv == dp - 1) {
nsp = sp | sv;
if (nsp == sp)
continue;
seen[p] = nsp;
interesting[nsp] += 1;
interesting[sp] -= 1;
if (interesting[sp] == 0)
ninteresting -= 1;
}
}
interesting[sv] -= 1;
if (interesting[sv] == 0)
ninteresting -= 1;
}
final = 0;
j = ninteresting;
for (i = 0; i < (int)(2 << revcount) && j > 0; i++) {
if (interesting[i] == 0)
continue;
final |= i;
j -= 1;
}
if (final == 0)
return PyList_New(0);
dict = PyDict_New();
if (dict == NULL)
goto bail;
j = ninteresting;
for (i = 0; i < revcount && j > 0; i++) {
PyObject *key;
if ((final & (1 << i)) == 0)
continue;
key = PyList_GET_ITEM(revs, i);
Py_INCREF(key);
Py_INCREF(Py_None);
if (PyDict_SetItem(dict, key, Py_None) == -1) {
Py_DECREF(key);
Py_DECREF(Py_None);
goto bail;
}
j -= 1;
}
keys = PyDict_Keys(dict);
free(depth);
free(seen);
free(interesting);
Py_DECREF(dict);
return keys;
bail:
free(depth);
free(seen);
free(interesting);
Py_XDECREF(dict);
return NULL;
}
/*
* Given a (possibly overlapping) set of revs, return the greatest
* common ancestors: those with the longest path to the root.
*/
static PyObject *index_ancestors(indexObject *self, PyObject *args)
{
PyObject *ret = NULL, *gca = NULL;
Py_ssize_t argcount, i, len;
bitmask repeat = 0;
int revcount = 0;
int *revs;
argcount = PySequence_Length(args);
revs = malloc(argcount * sizeof(*revs));
if (argcount > 0 && revs == NULL)
return PyErr_NoMemory();
len = index_length(self) - 1;
for (i = 0; i < argcount; i++) {
static const int capacity = 24;
PyObject *obj = PySequence_GetItem(args, i);
bitmask x;
long val;
if (!PyInt_Check(obj)) {
PyErr_SetString(PyExc_TypeError,
"arguments must all be ints");
goto bail;
}
val = PyInt_AsLong(obj);
if (val == -1) {
ret = PyList_New(0);
goto done;
}
if (val < 0 || val >= len) {
PyErr_SetString(PyExc_IndexError,
"index out of range");
goto bail;
}
/* this cheesy bloom filter lets us avoid some more
* expensive duplicate checks in the common set-is-disjoint
* case */
x = 1ull << (val & 0x3f);
if (repeat & x) {
int k;
for (k = 0; k < revcount; k++) {
if (val == revs[k])
goto duplicate;
}
}
else repeat |= x;
if (revcount >= capacity) {
PyErr_Format(PyExc_OverflowError,
"bitset size (%d) > capacity (%d)",
revcount, capacity);
goto bail;
}
revs[revcount++] = (int)val;
duplicate:;
}
if (revcount == 0) {
ret = PyList_New(0);
goto done;
}
if (revcount == 1) {
PyObject *obj;
ret = PyList_New(1);
if (ret == NULL)
goto bail;
obj = PyInt_FromLong(revs[0]);
if (obj == NULL)
goto bail;
PyList_SET_ITEM(ret, 0, obj);
goto done;
}
gca = find_gca_candidates(self, revs, revcount);
if (gca == NULL)
goto bail;
if (PyList_GET_SIZE(gca) <= 1) {
ret = gca;
Py_INCREF(gca);
}
else if (PyList_GET_SIZE(gca) == 1) {
ret = PyList_GET_ITEM(gca, 0);
Py_INCREF(ret);
}
else ret = find_deepest(self, gca);
done:
free(revs);
Py_XDECREF(gca);
return ret;
bail:
free(revs);
Py_XDECREF(gca);
Py_XDECREF(ret);
return NULL;
}
/*
* Invalidate any trie entries introduced by added revs.
*/
static void nt_invalidate_added(indexObject *self, Py_ssize_t start)
{
Py_ssize_t i, len = PyList_GET_SIZE(self->added);
for (i = start; i < len; i++) {
PyObject *tuple = PyList_GET_ITEM(self->added, i);
PyObject *node = PyTuple_GET_ITEM(tuple, 7);
nt_insert(self, PyString_AS_STRING(node), -1);
}
if (start == 0)
Py_CLEAR(self->added);
}
/*
* Delete a numeric range of revs, which must be at the end of the
* range, but exclude the sentinel nullid entry.
*/
static int index_slice_del(indexObject *self, PyObject *item)
{
Py_ssize_t start, stop, step, slicelength;
Py_ssize_t length = index_length(self);
int ret = 0;
if (PySlice_GetIndicesEx((PySliceObject*)item, length,
&start, &stop, &step, &slicelength) < 0)
return -1;
if (slicelength <= 0)
return 0;
if ((step < 0 && start < stop) || (step > 0 && start > stop))
stop = start;
if (step < 0) {
stop = start + 1;
start = stop + step*(slicelength - 1) - 1;
step = -step;
}
if (step != 1) {
PyErr_SetString(PyExc_ValueError,
"revlog index delete requires step size of 1");
return -1;
}
if (stop != length - 1) {
PyErr_SetString(PyExc_IndexError,
"revlog index deletion indices are invalid");
return -1;
}
if (start < self->length - 1) {
if (self->nt) {
Py_ssize_t i;
for (i = start + 1; i < self->length - 1; i++) {
const char *node = index_node(self, i);
if (node)
nt_insert(self, node, -1);
}
if (self->added)
nt_invalidate_added(self, 0);
if (self->ntrev > start)
self->ntrev = (int)start;
}
self->length = start + 1;
if (start < self->raw_length) {
if (self->cache) {
Py_ssize_t i;
for (i = start; i < self->raw_length; i++)
Py_CLEAR(self->cache[i]);
}
self->raw_length = start;
}
goto done;
}
if (self->nt) {
nt_invalidate_added(self, start - self->length + 1);
if (self->ntrev > start)
self->ntrev = (int)start;
}
if (self->added)
ret = PyList_SetSlice(self->added, start - self->length + 1,
PyList_GET_SIZE(self->added), NULL);
done:
Py_CLEAR(self->headrevs);
return ret;
}
/*
* Supported ops:
*
* slice deletion
* string assignment (extend node->rev mapping)
* string deletion (shrink node->rev mapping)
*/
static int index_assign_subscript(indexObject *self, PyObject *item,
PyObject *value)
{
char *node;
Py_ssize_t nodelen;
long rev;
if (PySlice_Check(item) && value == NULL)
return index_slice_del(self, item);
if (node_check(item, &node, &nodelen) == -1)
return -1;
if (value == NULL)
return self->nt ? nt_insert(self, node, -1) : 0;
rev = PyInt_AsLong(value);
if (rev > INT_MAX || rev < 0) {
if (!PyErr_Occurred())
PyErr_SetString(PyExc_ValueError, "rev out of range");
return -1;
}
return nt_insert(self, node, (int)rev);
}
/*
* Find all RevlogNG entries in an index that has inline data. Update
* the optional "offsets" table with those entries.
*/
static long inline_scan(indexObject *self, const char **offsets)
{
const char *data = PyString_AS_STRING(self->data);
const char *end = data + PyString_GET_SIZE(self->data);
long incr = v1_hdrsize;
Py_ssize_t len = 0;
while (data + v1_hdrsize <= end) {
uint32_t comp_len;
const char *old_data;
/* 3rd element of header is length of compressed inline data */
comp_len = getbe32(data + 8);
incr = v1_hdrsize + comp_len;
if (incr < v1_hdrsize)
break;
if (offsets)
offsets[len] = data;
len++;
old_data = data;
data += incr;
if (data <= old_data)
break;
}
if (data != end && data + v1_hdrsize != end) {
if (!PyErr_Occurred())
PyErr_SetString(PyExc_ValueError, "corrupt index file");
return -1;
}
return len;
}
static int index_init(indexObject *self, PyObject *args)
{
PyObject *data_obj, *inlined_obj;
Py_ssize_t size;
if (!PyArg_ParseTuple(args, "OO", &data_obj, &inlined_obj))
return -1;
if (!PyString_Check(data_obj)) {
PyErr_SetString(PyExc_TypeError, "data is not a string");
return -1;
}
size = PyString_GET_SIZE(data_obj);
self->inlined = inlined_obj && PyObject_IsTrue(inlined_obj);
self->data = data_obj;
self->cache = NULL;
self->added = NULL;
self->headrevs = NULL;
self->offsets = NULL;
self->nt = NULL;
self->ntlength = self->ntcapacity = 0;
self->ntdepth = self->ntsplits = 0;
self->ntlookups = self->ntmisses = 0;
self->ntrev = -1;
Py_INCREF(self->data);
if (self->inlined) {
long len = inline_scan(self, NULL);
if (len == -1)
goto bail;
self->raw_length = len;
self->length = len + 1;
} else {
if (size % v1_hdrsize) {
PyErr_SetString(PyExc_ValueError, "corrupt index file");
goto bail;
}
self->raw_length = size / v1_hdrsize;
self->length = self->raw_length + 1;
}
return 0;
bail:
return -1;
}
static PyObject *index_nodemap(indexObject *self)
{
Py_INCREF(self);
return (PyObject *)self;
}
static void index_dealloc(indexObject *self)
{
_index_clearcaches(self);
Py_DECREF(self->data);
Py_XDECREF(self->added);
PyObject_Del(self);
}
static PySequenceMethods index_sequence_methods = {
(lenfunc)index_length, /* sq_length */
0, /* sq_concat */
0, /* sq_repeat */
(ssizeargfunc)index_get, /* sq_item */
0, /* sq_slice */
0, /* sq_ass_item */
0, /* sq_ass_slice */
(objobjproc)index_contains, /* sq_contains */
};
static PyMappingMethods index_mapping_methods = {
(lenfunc)index_length, /* mp_length */
(binaryfunc)index_getitem, /* mp_subscript */
(objobjargproc)index_assign_subscript, /* mp_ass_subscript */
};
static PyMethodDef index_methods[] = {
{"ancestors", (PyCFunction)index_ancestors, METH_VARARGS,
"return the gca set of the given revs"},
{"clearcaches", (PyCFunction)index_clearcaches, METH_NOARGS,
"clear the index caches"},
{"get", (PyCFunction)index_m_get, METH_VARARGS,
"get an index entry"},
{"headrevs", (PyCFunction)index_headrevs, METH_NOARGS,
"get head revisions"},
{"insert", (PyCFunction)index_insert, METH_VARARGS,
"insert an index entry"},
{"partialmatch", (PyCFunction)index_partialmatch, METH_VARARGS,
"match a potentially ambiguous node ID"},
{"stats", (PyCFunction)index_stats, METH_NOARGS,
"stats for the index"},
{NULL} /* Sentinel */
};
static PyGetSetDef index_getset[] = {
{"nodemap", (getter)index_nodemap, NULL, "nodemap", NULL},
{NULL} /* Sentinel */
};
static PyTypeObject indexType = {
PyObject_HEAD_INIT(NULL)
0, /* ob_size */
"parsers.index", /* tp_name */
sizeof(indexObject), /* tp_basicsize */
0, /* tp_itemsize */
(destructor)index_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_compare */
0, /* tp_repr */
0, /* tp_as_number */
&index_sequence_methods, /* tp_as_sequence */
&index_mapping_methods, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
0, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT, /* tp_flags */
"revlog index", /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
index_methods, /* tp_methods */
0, /* tp_members */
index_getset, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
(initproc)index_init, /* tp_init */
0, /* tp_alloc */
};
/*
* returns a tuple of the form (index, index, cache) with elements as
* follows:
*
* index: an index object that lazily parses RevlogNG records
* cache: if data is inlined, a tuple (index_file_content, 0), else None
*
* added complications are for backwards compatibility
*/
static PyObject *parse_index2(PyObject *self, PyObject *args)
{
PyObject *tuple = NULL, *cache = NULL;
indexObject *idx;
int ret;
idx = PyObject_New(indexObject, &indexType);
if (idx == NULL)
goto bail;
ret = index_init(idx, args);
if (ret == -1)
goto bail;
if (idx->inlined) {
cache = Py_BuildValue("iO", 0, idx->data);
if (cache == NULL)
goto bail;
} else {
cache = Py_None;
Py_INCREF(cache);
}
tuple = Py_BuildValue("NN", idx, cache);
if (!tuple)
goto bail;
return tuple;
bail:
Py_XDECREF(idx);
Py_XDECREF(cache);
Py_XDECREF(tuple);
return NULL;
}
static char parsers_doc[] = "Efficient content parsing.";
PyObject *encodedir(PyObject *self, PyObject *args);
PyObject *pathencode(PyObject *self, PyObject *args);
PyObject *lowerencode(PyObject *self, PyObject *args);
static PyMethodDef methods[] = {
{"pack_dirstate", pack_dirstate, METH_VARARGS, "pack a dirstate\n"},
{"parse_manifest", parse_manifest, METH_VARARGS, "parse a manifest\n"},
{"parse_dirstate", parse_dirstate, METH_VARARGS, "parse a dirstate\n"},
{"parse_index2", parse_index2, METH_VARARGS, "parse a revlog index\n"},
{"encodedir", encodedir, METH_VARARGS, "encodedir a path\n"},
{"pathencode", pathencode, METH_VARARGS, "fncache-encode a path\n"},
{"lowerencode", lowerencode, METH_VARARGS, "lower-encode a path\n"},
{NULL, NULL}
};
void dirs_module_init(PyObject *mod);
static void module_init(PyObject *mod)
{
dirs_module_init(mod);
indexType.tp_new = PyType_GenericNew;
if (PyType_Ready(&indexType) < 0)
return;
Py_INCREF(&indexType);
PyModule_AddObject(mod, "index", (PyObject *)&indexType);
nullentry = Py_BuildValue("iiiiiiis#", 0, 0, 0,
-1, -1, -1, -1, nullid, 20);
if (nullentry)
PyObject_GC_UnTrack(nullentry);
dirstate_unset = Py_BuildValue("ciii", 'n', 0, -1, -1);
}
#ifdef IS_PY3K
static struct PyModuleDef parsers_module = {
PyModuleDef_HEAD_INIT,
"parsers",
parsers_doc,
-1,
methods
};
PyMODINIT_FUNC PyInit_parsers(void)
{
PyObject *mod = PyModule_Create(&parsers_module);
module_init(mod);
return mod;
}
#else
PyMODINIT_FUNC initparsers(void)
{
PyObject *mod = Py_InitModule3("parsers", methods, parsers_doc);
module_init(mod);
}
#endif