[RFA] JVMTI/JDWP GetAllLoadedClasses

[Kyle Galloway]

This patch implements the JVMTI and JDWP functions to get all loaded 
classes in the VM.  To accomplish this, each class is marked as loaded 
in _Jv_PushClass, by calling ClassList::add () and stored as a referent 
to an element of a list of WeakReferences.  When retrieving the list of 
loaded classes, the list is first checked to see if any of the classes 
has been GCed (there is a WeakReference to null), which will remove its 
entry from the list before it is returned.  In order to avoid problems 
with circular class loading(try to load a class, then try to add it to 
the class list, whihc requires WeakReference to be loaded, which needs 
to be stored in the list, whichi requires WeakReference to be 
loaded...and so on), until it can be assured that WeakReference is 
loaded (which is checked in ClassList::setup ()), the classes that have 
been loaded are stored in a temporary linked list of jclass *.  When 
setup is called, these classes are transferred over to the WeakReference 
list, and the memory used by this temporary list is freed.

ChangeLog
    * jvmti.cc (_Jv_JVMTI_GetLoadedClasses): New method.
    * prims.cc (_Jv_CreateJavaVM): Call ClassList::setup ().
    * gnu/gcj/jvmti/ClassList.h: New file.
    * gnu/gcj/jvmti/natClassList.cc: New file.
    * gnu/classpath/jdwp/natVMVirtualMachine.cc (getAllLoadedClasses): 
Implement.
    * java/lang/natClassLosder.cc (_Jv_PushClass): Call ClassList::add ().
    * Makefile.am: Add gnu/gcj/jvmti/natClassList.cc.
    * Makefile.in: Regenerated.

Questions/comments/concerns?

Thanks,

Kyle
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