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LibJS: Add MarkedValueList and use it for argument passing

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A MarkedValueList is basically a Vector<JS::Value> that registers with
the Heap and makes sure that the stored values don't get GC'd.

Before this change, we were unsafely keeping Vector<JS::Value> in some
places, which is out-of-reach for the live reference finding logic
since Vector puts its elements on the heap by default.

We now pass all the JavaScript tests even when running with "js -g",
which does a GC on every heap allocation.
This commit is contained in:
Andreas Kling 2020-04-19 17:24:56 +02:00
parent cb3cf589ed
commit f7a1696087
13 changed files with 178 additions and 16 deletions
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5
Libraries/LibJS/Heap/Heap.h
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@ -68,6 +68,9 @@ public:
void did_create_handle(Badge<HandleImpl>, HandleImpl&);
void did_destroy_handle(Badge<HandleImpl>, HandleImpl&);
void did_create_marked_value_list(Badge<MarkedValueList>, MarkedValueList&);
void did_destroy_marked_value_list(Badge<MarkedValueList>, MarkedValueList&);
void defer_gc(Badge<DeferGC>);
void undefer_gc(Badge<DeferGC>);
@ -90,6 +93,8 @@ private:
Vector<NonnullOwnPtr<HeapBlock>> m_blocks;
HashTable<HandleImpl*> m_handles;
HashTable<MarkedValueList*> m_marked_value_lists;
size_t m_gc_deferrals { 0 };
bool m_should_gc_when_deferral_ends { false };
};