Author: Armin Rigo <ar...@tunes.org>
Branch:
Changeset: r498:d2e01fce511f
Date: 2013-08-23 20:10 +0200
http://bitbucket.org/pypy/stmgc/changeset/d2e01fce511f/
Log: Fix a bug found by running PyPy (graphwalktest.py, which I will
check in together with other test files I'm writing).
diff --git a/c4/steal.c b/c4/steal.c
--- a/c4/steal.c
+++ b/c4/steal.c
@@ -217,11 +217,12 @@
dprintf(("already stolen: %p -> %p\n", P, L));
/* note that we should follow h_revision at least one more
- step: it is necessary if L is public but young (and then
- has GCFLAG_MOVED), but it is fine to do it more
- generally. */
- v = ACCESS_ONCE(L->h_revision);
- if (IS_POINTER(v)) {
+ step: in the case where L is public but young (and then
+ has GCFLAG_MOVED). Don't do it generally! L might be
+ a stub again. */
+ if (L->h_tid & GCFLAG_MOVED) {
+ v = ACCESS_ONCE(L->h_revision);
+ assert(IS_POINTER(v));
L = (gcptr)v;
dprintf(("\t---> %p\n", L));
}
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