At 7:50 PM +0000 6/24/99, David G. Wonnacott wrote:
>Is there some reason to consider (a) two provably equivalent models,
>(b) one unified model (the current state of affairs?), and (c) a JVM
>model and a statement that the JLS model is whatever translates into
>the JVM model, but not (d) a JLS model and a rule of the form "any
>compiler/JVM pair must preserve this model".
> >From (d) we would then derive a rule about the standard JVM that
>ensures any bytecodes are compilant, but we also have the option of
>producing more sophisticated compiler/JVM variants, based on future
>experience (these could even become parts of future versions of the
The problem is that compilers and VM's don't come in matched pairs.
Bytecode generated by any compiler should run on any JVM.
> Variants would have to tag bytecodes to make sure they
>weren't executed in a mismatched JVM, but I assume there's already a
>mechanism for this.
It wouldn't be valid Java is tags changed the semantics of the bytecodes.
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