RE: help on classpath on ppc 405

[Robert Lougher]

Hi Fabio,

I'll answer this properly off list.  From the looks of it, you have a 
configuration problem. The VM can't find the JamVM versions of the VM 
classes (VMThread, etc.) and has picked up the default Classpath version of 
VMThread, which doesn't have the vmData field.  It expects to find them in 
/usr/local/share/jamvm.  If you put them somewhere else you need to override 
the default location at build time.

Rob.

----Original Message Follows----
From: "Fabio Antonini" <address@hidden>
To: address@hidden
Subject: help on classpath on ppc 405
Date: Mon, 07 Jun 2004 13:58:33 +0200

Hi all
my name is Fabio Antonini and since the last week I'm evaluating classpath
with jamvm. I'm trying to cross-compile the classpath/jamvm for a ppc405
from a i686 linux based host. When I run the jamvm on a simple hello world
class file I receive the following message

sh-2.04#  /usr/local/bin/jamvm -verbose -verbosegc -noasyncgc hello
[Linking class java/lang/Object]
[Linking class java/io/Serializable]
[Loaded /usr/local/classpath/share/classpath/java/lang/Class.class]
[Linking class java/lang/Class]
[Loaded /usr/local/classpath/share/classpath/java/io/Serializable.class]
[Loaded /usr/local/classpath/share/classpath/java/lang/Class.class]
[Loaded /usr/local/classpath/share/classpath/java/lang/Object.class]
[Loaded /usr/local/classpath/share/classpath/java/lang/Runnable.class]
[Linking class java/lang/Runnable]
[Loaded /usr/local/classpath/share/classpath/java/lang/Thread.class]
[Linking class java/lang/Thread]
[Loaded /usr/local/classpath/share/classpath/java/lang/VMThread.class]
[Linking class java/lang/VMThread]
Error initialising VM (initialiseMainThread

Digging into the code with lots of printf I've seen that the problem arises
inside the initialiseMainThread function when the VM tries to read some
parameters from the class

thread_class = findSystemClass0("java/lang/Thread");

vmThread = findField(thread_class, "vmThread", "Ljava/lang/VMThread;");
daemon = findField(thread_class, "daemon", "Z");
name = findField(thread_class, "name", "Ljava/lang/String;");
group = findField(thread_class, "group", "Ljava/lang/ThreadGroup;");
priority = findField(thread_class, "priority", "I");

run = findMethod(thread_class, "run", "()V");

vmthread_class = findSystemClass0("java/lang/VMThread");
thread = findField(vmthread_class, "thread", "Ljava/lang/Thread;");
vmData = findField(vmthread_class, "vmData", "I");
printf("Hello from Fabio\n");
/* findField and findMethod do not throw an exception... */
if((vmData == NULL) || (run == NULL) || (daemon == NULL) || (name == NULL)
||
    (group == NULL) || (priority == NULL) || (vmThread == NULL) || (thread
== NULL))

Any idea about this? Could this be related to the different endianess
between the target and host processors?
Any help will be appreciated.
Thank you in advance
Fabio

Fabio Antonini
Kasko Networks S.r.l.
Via Patini 46, 67100 L'Aquila (ITALY)
SW Designer
ph: +3986265562, fax: +3986265562
email: address@hidden, address@hidden



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