[virtmach] Virtual Machines and Code Representation
Mon, 24 Jul 2000 09:43:18 +0100
> The rationale for using a parse tree rather than byte-codes
> is that more information is available to a specific compiler to generate
> "better" machine code, in whatever way "better" is defined
> (faster/smaller/safer/more parrallel/etc...).
If you haven't already seen it, look at the ANDF (Architecture
Neutral Distribution Format) system developed by the UK Defence
Research Agency, adopted by OSF at one stage, and exploited by
Etnoteam as far as I remember.
ANDF was designed to support multiple source languages. It used
the model of an ANDF producer (convert source to ANDF) and
consumer (ANDF to native code). It was assumed that the consumer
ran on a workstation class machine. Together with the need for a
back-end linker. This prevented its adoption for direct
compilation on small targets.
The problem with the use of higher level descriptions has always
been that it places higher CPU requirements on the back end,
which usually rules out use on small embedded CPUs.
Stephen Pelc, firstname.lastname@example.org
MicroProcessor Engineering Ltd - More Real, Less Time
133 Hill Lane, Southampton SO15 5AF, England
tel: +44 23 80 631441, fax: +44 23 80 339691