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author | ko1 <ko1@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2013-06-18 19:50:44 +0000 |
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committer | ko1 <ko1@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2013-06-18 19:50:44 +0000 |
commit | 67d6aaca3521f6fe089103e72157e05ee950882a (patch) | |
tree | 1b75a0e459d8935fc282d35f7c88edb79b94ff18 /bignum.c | |
parent | 81568a297b21334014c51fbde6c0026f1c6c86c3 (diff) | |
download | ruby-67d6aaca3521f6fe089103e72157e05ee950882a.tar.gz |
* variable.c (rb_const_set): fix WB miss.
WBs had located before creating reference between a klass
and constant value. It causes GC bug.
# pseudo code:
WB(klass, value); # WB and remember klass
st_insert(klass->const_table, const_id, value);
`st_insert()' can cause GC before inserting `value' and
forget `klass' from the remember set. After that, relationship
between `klass' and `value' are created with constant table.
Now, `value' can be young (shady) object and `klass' can be old
object, without remembering `klass' object.
At the next GC, old `klass' object will be skipped and
young (shady) `value' will be miss-collected. -> GC bug
Lesson: The place of a WB is important.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41396 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'bignum.c')
0 files changed, 0 insertions, 0 deletions