Store MemoryCache's live decoded resources in a ListHashSet

• Component: Page Loading
• Status: RESOLVED FIXED

[Chris Dumez]

Store MemoryCache's live decoded resources in a ListHashSet instead of a linked list. The frequent operations are:
1. Add items to one end
2. Remove items from the other end or anywhere in the container by value

Using a ListHashSet instead of a manual linked list results in *much* simpler code and is fast for all operations (faster than linked list even for removing an given element from the linked list given its value). The current implementation requires us to keep a lot of pointers up-to-date, which is error prone.

This is a first step towards simplifying the MemoryCache implementation.

[Chris Dumez]

Created attachment 245653 [details]
Patch

[Antti Koivisto]

Comment on attachment 245653 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=245653&action=review

> Source/WebCore/loader/cache/MemoryCache.h:142
> +    bool inLiveDecodedResourcesList(CachedResource* resource) const { return m_liveDecodedResources.contains(resource); }

It would be nicer to take a reference.

[Chris Dumez]

Committed r179402: <http://trac.webkit.org/changeset/179402>