Weldon Washburn wrote:
oops, I forgot to cc:
---------- Forwarded message ----------
From: Weldon Washburn <[EMAIL PROTECTED]>
Date: May 24, 2006 11:23 AM
Subject: Re: [DRLVM] proposal to port MMTK to drlvm
To: [EMAIL PROTECTED]
On 5/24/06, Daniel Feinberg <[EMAIL PROTECTED]> wrote:
that is cool, so the other thing i was thinking about is that MMTK is
written for JikesRVM which is a meta-circular java implementation. AKA
it is written in java with some magic for the low level mem stuff. I
am not sure how that would integrate into Harmoney and the DRLVM. I
dont think it would be hard to port it to another language or we could
write some sort of interface to bridge the two. Not sure what are your
ideas?
hmm.... somewhere I heard that MMTK had been ported to Microsoft
Rotor. I know Rotor is a vm written in C/C++. If this port is under
an Apache agreeable license, then we could look at this code. If no
MMTK-to-C interface that is compatible with Apache license exists
then, of course, we will need to build one. My preference would be to
keep it the interface combinations to C and Java. I would rather not
bog down MMTK/HarmonyDRLVM with any C++ distractions initially. I
think the initial focus is functionality, cleaning up the C interface,
then performance.
The port to rotor was done by Andrew Gray at ANU, and was based on my
work integrating MMTk into C-based runtimes. The approach used was to
apply a source code transformation to turn the MMTk 'magic' into native
methods (using CNI) on primitive types, and compile MMTk with gcj. It
is described in detail in my honours thesis.
The source transformer code is licensed as public domain, but would need
considerable modification to work on the current MMTk code base. A far
better approach would be to implement the vmmagic types in gcj. The
bulk of the C code in the interface to Rotor is specific to rotor, and
would need to be re-implemented for DRLVM anyway.
The MMTk <-> VM interface is much cleaner these days: as Daniel points
out, MM_Interface defines the JikesRVM -> MMTk interface, and MMTk's
interface to the vm is the package org.mmtk.vm. MMTk is compiled to a
JAR file against stubs for this package, and the directory ext/JikesRVM
contains the JikesRVM-specific implementation of the interface.
cheers
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