GC improvements
The first word, the GC header, describes the layout. It encodes on half a word the shape of the object, including where it contains further pointers, so that the GC can trace it. The other half contains GC flags (e.g. the mark bit of a mark-and-sweep GC). The second word is used for method dispatch. It is similar to a C++ vtable pointer. It points to static data that is mostly a table of methods (
Factor's implementation of polymorphic inline caching
Polymorphic inline caching is a technique to speed up method dispatch by generating custom code at method call sites that checks the receiver against only those classes that have come up at that call site. If the receiver's class does not appear in the polymorphic inline cache (this case is known as a "cache miss"), then a new call stub is generated, which checks the receiver's class in addition t
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