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fix ordering of weak reference and finalization processing

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This commit is contained in:
Joel Dice 2007-07-04 12:40:31 -06:00
parent da844719ab
commit 0a32a7b7af
1 changed files with 26 additions and 15 deletions
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41
src/vm.cpp
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@ -763,6 +763,26 @@ collect(Machine* m, Heap::CollectionType type)
} }
Thread* t = m->rootThread; Thread* t = m->rootThread;
object p = m->weakReferences;
m->weakReferences = 0;
while (p) {
object o = jreferenceTarget(t, p);
object followed = m->heap->follow(o);
if (followed == o) {
// object has not been collected
object x = p;
p = weakReferenceNext(t, x);
weakReferenceNext(t, x) = m->weakReferences;
m->weakReferences = x;
} else {
jreferenceTarget(t, p) = followed;
object x = p;
p = weakReferenceNext(t, x);
weakReferenceNext(t, x) = 0;
}
}
for (object* f = &(m->finalizers); *f;) { for (object* f = &(m->finalizers); *f;) {
object o = finalizerTarget(t, *f); object o = finalizerTarget(t, *f);
if (m->heap->follow(o) == o) { if (m->heap->follow(o) == o) {
@ -783,21 +803,6 @@ collect(Machine* m, Heap::CollectionType type)
for (object* f = &(m->doomed); *f; f = &finalizerNext(t, *f)) { for (object* f = &(m->doomed); *f; f = &finalizerNext(t, *f)) {
v->visit(f); v->visit(f);
} }
for (object p = m->weakReferences; p;) {
object o = jreferenceTarget(t, p);
object followed = m->heap->follow(o);
if (followed == o) {
// object has not been collected
jreferenceTarget(t, p) = 0;
} else {
jreferenceTarget(t, p) = followed;
}
object last = p;
p = weakReferenceNext(t, p);
weakReferenceNext(t, last) = 0;
}
} }
virtual unsigned sizeInWords(object o) { virtual unsigned sizeInWords(object o) {
@ -931,6 +936,12 @@ collect(Machine* m, Heap::CollectionType type)
} }
m->doomed = 0; m->doomed = 0;
for (object p = m->weakReferences; p;) {
jreferenceTarget(t, p) = 0;
object x = p;
p = weakReferenceNext(t, x);
weakReferenceNext(t, x) = 0;
}
m->weakReferences = 0; m->weakReferences = 0;
} }