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[js weak refs] Expand WeakCell::WeakCellVerify + minor fix

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(The bug didn't affect any functionality; we just left detached WeakCells in
inconsistent state.)

BUG=v8:8179

Change-Id: I28f6c27532383b94bdfd746db903096f1dc6f1cc
Reviewed-on: https://chromium-review.googlesource.com/c/1447651
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59255}
This commit is contained in:
Marja Hölttä 2019-01-31 09:54:38 +01:00 committed by Commit Bot
parent 9bf9717192
commit 1387d5a25a
3 changed files with 27 additions and 8 deletions
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23
src/objects-debug.cc
View File

@ -1298,13 +1298,30 @@ void WeakCell::WeakCellVerify(Isolate* isolate) {
CHECK(IsWeakCell());
CHECK(target()->IsJSReceiver() || target()->IsUndefined(isolate));
CHECK(prev()->IsWeakCell() || prev()->IsUndefined(isolate));
if (prev()->IsWeakCell()) {
CHECK_EQ(WeakCell::cast(prev())->next(), *this);
}
CHECK(next()->IsWeakCell() || next()->IsUndefined(isolate));
if (next()->IsWeakCell()) {
CHECK_EQ(WeakCell::cast(next())->prev(), *this);
}
CHECK(prev()->IsWeakCell() || prev()->IsUndefined(isolate));
if (prev()->IsWeakCell()) {
CHECK_EQ(WeakCell::cast(prev())->next(), *this);
CHECK_IMPLIES(key()->IsUndefined(isolate),
key_list_prev()->IsUndefined(isolate));
CHECK_IMPLIES(key()->IsUndefined(isolate),
key_list_next()->IsUndefined(isolate));
CHECK(key_list_prev()->IsWeakCell() || key_list_prev()->IsUndefined(isolate));
if (key_list_prev()->IsWeakCell()) {
CHECK_EQ(WeakCell::cast(key_list_prev())->key_list_next(), *this);
}
CHECK(key_list_next()->IsWeakCell() || key_list_next()->IsUndefined(isolate));
if (key_list_next()->IsWeakCell()) {
CHECK_EQ(WeakCell::cast(key_list_next())->key_list_prev(), *this);
}
CHECK(finalization_group()->IsUndefined(isolate) ||

4
src/objects/js-weak-refs-inl.h
View File

@ -172,7 +172,9 @@ Object JSFinalizationGroup::PopClearedCellHoldings(
Handle<Object> key = handle(weak_cell->key(), isolate);
Handle<WeakCell> next =
handle(WeakCell::cast(weak_cell->key_list_next()), isolate);
next->set_key_list_prev(weak_cell->key_list_prev());
DCHECK_EQ(next->key_list_prev(), *weak_cell);
next->set_key_list_prev(ReadOnlyRoots(isolate).undefined_value());
weak_cell->set_key_list_next(ReadOnlyRoots(isolate).undefined_value());
key_map = ObjectHashTable::Put(key_map, key, next);
finalization_group->set_key_map(*key_map);
} else {

8
test/cctest/test-js-weak-refs.cc
View File

@ -406,9 +406,9 @@ TEST(TestJSFinalizationGroupPopClearedCellHoldings2) {
*weak_cell1);
}
Object cleared2 =
Object cleared1 =
JSFinalizationGroup::PopClearedCellHoldings(finalization_group, isolate);
CHECK_EQ(cleared2, *holdings2);
CHECK_EQ(cleared1, *holdings2);
{
Handle<ObjectHashTable> key_map =
@ -416,9 +416,9 @@ TEST(TestJSFinalizationGroupPopClearedCellHoldings2) {
VerifyWeakCellKeyChain(isolate, key_map->Lookup(key1), 1, *weak_cell1);
}
Object cleared3 =
Object cleared2 =
JSFinalizationGroup::PopClearedCellHoldings(finalization_group, isolate);
CHECK_EQ(cleared3, *holdings1);
CHECK_EQ(cleared2, *holdings1);
{
Handle<ObjectHashTable> key_map =