2011-02-03 Geoffrey Garen <ggaren@apple.com>

2011-02-03  Geoffrey Garen  <ggaren@apple.com>

        Reviewed by Cameron Zwarich.

        Changed MarkedSpace to delegate grow/shrink decisions to Heap
        https://bugs.webkit.org/show_bug.cgi?id=53759

        SunSpider reports no change.

        * runtime/Heap.cpp:
        (JSC::Heap::Heap):
        (JSC::Heap::reset):
        * runtime/Heap.h: Reorganized a few data members for better cache locality.
        Added a grow policy.

        * runtime/MarkedSpace.cpp:
        (JSC::MarkedSpace::allocate):
        (JSC::MarkedSpace::sweep):
        (JSC::MarkedSpace::reset): Don't shrink automatically. Instead, wait for
        the heap to make an explicit sweep call.

        * runtime/MarkedSpace.h:
        (JSC::MarkedSpace::highWaterMark):
        (JSC::MarkedSpace::setHighWaterMark): Use a watermark to determine how
        many bytes to allocate before failing and giving the heap an opportunity
        to collect garbage. This also means that we allocate blocks on demand,
        instead of ahead of time.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@77612 268f45cc-cd09-0410-ab3c-d52691b4dbfc