[webkit-dev] New marking model for GC collected objects
oliver at apple.com
Tue Aug 11 11:59:38 PDT 2009
Last night I landed a patch that replaces the old recursive marking
functions with a new iterative model that uses an explicit mark
stack. This means that any custom mark methods that you need to write
now need to be slightly different from what they were previously, i'll
attempt to summarise here.
The most obvious change is that an object is no longer responsible for
marking itself instead the recursive mark methods have been replaced
by a new virtual markChildren(MarkStack&) which is responsible for
appending an objects children to the stack.
The MarkStack is a very simple class, and the only method you really
need to know about is MarkStack::append which adds a new object to the
The changes to how your custom marking functions are implemented are
trivial, but here's a simple example
void MyAwesomeObject::markChildren(MarkStack& markStack)
And that's it, you're done.
It's important to note that you will never be in a position where you
call markChildren yourself, if you are that is an error.
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