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reachableroots: use internal "revstates" array to test if rev is a root
The main goal of this patch series is to reduce the use of PyXxx() function that is likely to require ugly error handling and inc/decref. Plus, this is faster than using PySet_Contains(). revset #0: 0::tip 0) 0.004168 1) 0.003678 88% This patch ignores out-of-range roots as they are in the pure implementation. Because reachable sets are calculated from heads, and out-of-range heads raise IndexError, we can just take out-of-range roots as unreachable. Otherwise, the test of "hg log -Gr '. + wdir()'" would fail. "heads" argument is changed to a list. Should we have to rename the C function as its signature is changed?
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@ -187,7 +187,7 @@ class changelog(revlog.revlog):
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def reachableroots(self, minroot, heads, roots, includepath=False):
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return revset.baseset(sorted(
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self.index.reachableroots(minroot, heads, roots, includepath)))
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self.index.reachableroots2(minroot, heads, roots, includepath)))
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def headrevs(self):
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if self.filteredrevs:
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@ -1108,16 +1108,15 @@ static inline void set_phase_from_parents(char *phases, int parent_1,
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phases[i] = phases[parent_2];
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}
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static PyObject *reachableroots(indexObject *self, PyObject *args)
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static PyObject *reachableroots2(indexObject *self, PyObject *args)
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{
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/* Input */
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long minroot;
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PyObject *includepatharg = NULL;
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int includepath = 0;
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/* heads is a list */
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/* heads and roots are lists */
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PyObject *heads = NULL;
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/* roots is a set */
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PyObject *roots = NULL;
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PyObject *reachable = NULL;
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@ -1136,12 +1135,13 @@ static PyObject *reachableroots(indexObject *self, PyObject *args)
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* revstates: array of length len+1 (all revs + nullrev) */
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int *tovisit = NULL;
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long lentovisit = 0;
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enum { RS_SEEN = 1 };
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enum { RS_SEEN = 1, RS_ROOT = 2 };
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char *revstates = NULL;
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/* Get arguments */
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if (!PyArg_ParseTuple(args, "lO!O!O!", &minroot, &PyList_Type, &heads,
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&PySet_Type, &roots, &PyBool_Type, &includepatharg))
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&PyList_Type, &roots,
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&PyBool_Type, &includepatharg))
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goto bail;
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if (includepatharg == Py_True)
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@ -1167,6 +1167,18 @@ static PyObject *reachableroots(indexObject *self, PyObject *args)
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goto bail;
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}
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l = PyList_GET_SIZE(roots);
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for (i = 0; i < l; i++) {
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revnum = PyInt_AsLong(PyList_GET_ITEM(roots, i));
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if (revnum == -1 && PyErr_Occurred())
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goto bail;
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/* If root is out of range, e.g. wdir(), it must be unreachable
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* from heads. So we can just ignore it. */
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if (revnum + 1 < 0 || revnum + 1 >= len + 1)
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continue;
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revstates[revnum + 1] |= RS_ROOT;
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}
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/* Populate tovisit with all the heads */
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l = PyList_GET_SIZE(heads);
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for (i = 0; i < l; i++) {
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@ -1188,17 +1200,15 @@ static PyObject *reachableroots(indexObject *self, PyObject *args)
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while (k < lentovisit) {
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/* Add the node to reachable if it is a root*/
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revnum = tovisit[k++];
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val = PyInt_FromLong(revnum);
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if (val == NULL)
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goto bail;
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if (PySet_Contains(roots, val) == 1) {
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if (revstates[revnum + 1] & RS_ROOT) {
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val = PyInt_FromLong(revnum);
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if (val == NULL)
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goto bail;
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PySet_Add(reachable, val);
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if (includepath == 0) {
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Py_DECREF(val);
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Py_DECREF(val);
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if (includepath == 0)
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continue;
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}
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}
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Py_DECREF(val);
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/* Add its parents to the list of nodes to visit */
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if (revnum == -1)
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@ -2434,7 +2444,7 @@ static PyMethodDef index_methods[] = {
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"get an index entry"},
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{"computephasesmapsets", (PyCFunction)compute_phases_map_sets,
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METH_VARARGS, "compute phases"},
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{"reachableroots", (PyCFunction)reachableroots, METH_VARARGS,
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{"reachableroots2", (PyCFunction)reachableroots2, METH_VARARGS,
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"reachableroots"},
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{"headrevs", (PyCFunction)index_headrevs, METH_VARARGS,
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"get head revisions"}, /* Can do filtering since 3.2 */
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@ -94,6 +94,7 @@ def reachablerootspure(repo, minroot, roots, heads, includepath):
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if not roots:
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return baseset()
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parentrevs = repo.changelog.parentrevs
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roots = set(roots)
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visit = list(heads)
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reachable = set()
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seen = {}
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@ -133,7 +134,7 @@ def reachableroots(repo, roots, heads, includepath=False):
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# XXX this should be 'parentset.min()' assuming 'parentset' is a smartset
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# (and if it is not, it should.)
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minroot = min(roots)
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roots = set(roots)
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roots = list(roots)
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heads = list(heads)
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try:
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return repo.changelog.reachableroots(minroot, heads, roots, includepath)
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@ -69,28 +69,53 @@ Test SEGV caused by bad revision passed to reachableroots() (issue4775):
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$ python <<EOF
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> from mercurial import changelog, scmutil
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> cl = changelog.changelog(scmutil.vfs('.hg/store'))
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> print 'goods:'
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> print 'good heads:'
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> for head in [0, len(cl) - 1, -1]:
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> print'%s: %r' % (head, cl.reachableroots(0, [head], set([0])))
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> print 'bads:'
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> print'%s: %r' % (head, cl.reachableroots(0, [head], [0]))
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> print 'bad heads:'
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> for head in [len(cl), 10000, -2, -10000, None]:
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> print '%s:' % head,
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> try:
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> cl.reachableroots(0, [head], set([0]))
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> cl.reachableroots(0, [head], [0])
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> print 'uncaught buffer overflow?'
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> except (IndexError, TypeError) as inst:
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> print inst
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> print 'good roots:'
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> for root in [0, len(cl) - 1, -1]:
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> print '%s: %r' % (root, cl.reachableroots(root, [len(cl) - 1], [root]))
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> print 'out-of-range roots are ignored:'
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> for root in [len(cl), 10000, -2, -10000]:
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> print '%s: %r' % (root, cl.reachableroots(root, [len(cl) - 1], [root]))
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> print 'bad roots:'
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> for root in [None]:
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> print '%s:' % root,
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> try:
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> cl.reachableroots(root, [len(cl) - 1], [root])
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> print 'uncaught error?'
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> except TypeError as inst:
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> print inst
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> EOF
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goods:
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good heads:
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0: <baseset [0]>
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1: <baseset [0]>
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-1: <baseset []>
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bads:
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bad heads:
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2: head out of range
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10000: head out of range
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-2: head out of range
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-10000: head out of range
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None: an integer is required
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good roots:
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0: <baseset [0]>
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1: <baseset [1]>
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-1: <baseset [-1]>
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out-of-range roots are ignored:
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2: <baseset []>
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10000: <baseset []>
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-2: <baseset []>
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-10000: <baseset []>
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bad roots:
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None: an integer is required
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$ cd ..
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@ -127,7 +152,7 @@ Test corrupted p1/p2 fields that could cause SEGV at parsers.c:
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> n0, n1 = cl.node(0), cl.node(1)
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> ops = [
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> ('reachableroots',
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> lambda: cl.index.reachableroots(0, [1], set([0]), False)),
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> lambda: cl.index.reachableroots2(0, [1], [0], False)),
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> ('compute_phases_map_sets', lambda: cl.computephases([[0], []])),
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> ('index_headrevs', lambda: cl.headrevs()),
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> ('find_gca_candidates', lambda: cl.commonancestorsheads(n0, n1)),
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