Re: [rvm-research] How are the unboxed classes implemented?

> Hi Liangliang,
>
> if you look in the boot image writer you can see variants of the VM
> magic that don't return null (these are the actual versions compiled
> into Jikes RVM), the purpose of the other magics is to capture the API
> for javac compile time. When the compiler sees the unboxed classes it
> doesn't treat them as objects with method calls but instead places the
> unboxed value in a register and directly applies arithmetic, etc. to
> it. The code for this is in files with magic in their name within the
> compilers.
>
> Regards,
> Ian
> --
> Looking for Jikes RVM on 64bit Linux? Switch to MRP - http://mrp.codehaus.org/
>
> 2009/6/15 Liangliang Tong <lltong@...>:
>  
>> Hi all,
>>
>> Space.java, the class that defines and manages spaces, is constructed
>> like the following:
>>
>> if (vmRequest.type == VMRequest.REQUEST_DISCONTIGUOUS) {
>>      this.contiguous = false;
>>      this.descriptor = SpaceDescriptor.createDescriptor();
>>      this.start = Address.zero();
>>      this.extent = Extent.zero();
>>      this.lastDiscontiguousRegion = Address.zero();
>>      VM.memory.setHeapRange(index, HEAP_START, HEAP_END);
>>      return;
>>    }
>>
>> As I know, Address and Extent classes have not been implemented, their
>> methods return nothing but null.
>> In this case, how can a space be created correctly? which really confuse
>> me a lot.
>> It will be highly appreciated if you can solve my puzzle.
>> Thanks.
>>
>> --
>> Regards,
>> Liangliang Tong
>>
>>
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>>    
>
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