native CompiledMethod format

Hi, for some time I've been wondering how the native code for CompiledMethods is arranged, and I have a few specific questions. Any pointers to info will be very much welcome

Are the native opcodes maintained in Smalltalk objects or in external memory?

and then:

Generally, how are CompiledMethods fixed after a Garbage Collection?

for example, how are references to other objects handled? are calls to other methods somehow inlined (I mean, direct calls, not through lookups), and if so, how are this inlined direct calls solved when native code moves around (if it's stored in Object Memory)

I know that by reading the code I can learn all this, but my need for info is not so serious :)

thanks a lot! richie