[Help-smalltalk] JIT issues and todolist

[Holger Hans Peter Freyther]

Hi all,

I will not have time for another couple of weeks for the JIT but just
in case someone is interested to continue or has some insight here is
a list of known issues:


1.) The Delay test is failing as the spOffset/sp of a context is -1.
This means that in some jitted code there is an unbalanced push/pop
in the stack.

2.) The maybe releasing of native code is failing with snapshot/resume
of the image. Passing an '-i' will 'fix' the segfault. The interesting
bit is that this happens _after_ the fixup must have set context
native_ip to 0. So I wonder if this could actually be the fix:

diff --git a/libgst/interp-jit.inl b/libgst/interp-jit.inl
index 0e8fa27..18dc40e 100644
--- a/libgst/interp-jit.inl
+++ b/libgst/interp-jit.inl
@@ -353,6 +353,7 @@ refresh_native_ips (OOP contextOOP)
          virtualIP = TO_INT (context->ipOffset);
          native_ip =
            _gst_map_virtual_ip (context->method, receiverClass, virtualIP);
+          context->method->flags |= F_XLAT_REACHABLE;
 
 #ifndef OPTIMIZE
          if (!native_ip)


3.) The debug semaphore does not work, I think it should either set
the exception flag or the emit_interrupt_check should make a NULL test
for it. I am not sure how this is supposed to work yet.


4.) Porting to GNU lighting 1.9/2.0 would be nice. This way I could
have a JIT on ARM as well. I have had this wish/hope for quite some time
already but thanks to another Paulo GNU lightning can support that now.


cheers

        holger