Re: Problem with static fields and indirect-dispatch

[Casey Marshall <csm at gnu dot org>]

On IRC Bryce mentioned -fno-indirect-classes, and if I compile this  
test case with that flag, it works.

Why do I need that flag? It seems like it's equivalent to `-fmake-it- 
work-really' or something.

On May 10, 2006, at 2:32 PM, Casey Marshall wrote:

> Hi, I'm seeing a problem with a 4.2.0 snapshot. The following  
> program fails to run; without the patch mentioned, it still fails,  
> but in `java.lang.Class.initializeClass,' not in `testbc.<clinit>'.  
> Without the patch, it fails at line 1663 of link.cc, which is the  
> `if' in:
>
>   jstring *strp = (jstring *) f->u.addr;
>   if (*strp)
>     *strp = _Jv_NewStringUTF8Const ((_Jv_Utf8Const *) *strp);
>
> Running this interpreted, or compiled directly works; compiling it  
> with -findirect-dispatch and launching it with `gij' fails.
>
> Thanks.
>
> ----
>
> /*
>  * Steps to reproduce:
>  * 1. gcj -C testbc.java
>  * 2. jar cf testbc.jar testbc.class
>  * 3. gcj -shared -g -O2 -findirect-dispatch -o testbc.jar.so  
> testbc.jar
>  * 4. gcj-dbtool -n testbc.gcjdb 32
>  * 5. gcj-dbtool -a testbc.gcjdb testbc.jar testbc.jar.so
>  * 6. gij -cp testbc.jar -Dgnu.gcj.precompiled.db.path=testbc.gcjdb  
> testbc
>  *
>  * Expected output:
>  * {}
>  * Actual output:
>  * Exception in thread "main" java.lang.ExceptionInInitializerError
>  *   at java.lang.Class.initializeClass (natClass.cc:758)
>  *   at java.lang.Class.forName (Class.h:641)
>  *   at gnu.java.lang.MainThread.run (MainThread.java:95)
>  * Caused by: java.lang.NullPointerException
>  *   at testbc.<clinit> (testbc.java:5)
>  *   at java.lang.Class.initializeClass (natClass.cc:750)
>  *   ...2 more
>  *
>  * Version info:
>  * gcj (GCC) 4.2.0 20060506 (experimental)
>  * Copyright (C) 2006 Free Software Foundation, Inc.
>  * This is free software; see the source for copying conditions.   
> There is NO
>  * warranty; not even for MERCHANTABILITY or FITNESS FOR A  
> PARTICULAR PURPOSE.
>  *
>  * This patch was applied to the sources:
>  * http://gcc.gnu.org/ml/java-patches/2006-q2/msg00127.html
>  *
>  * Host triplet (build and target): i686-pc-linux-gnu.
>  */
>
> import java.util.Hashtable;
>
> public class testbc
> {
>   protected static Hashtable cache = new Hashtable();
>
>   public static void main (String[] s) throws Throwable
>   {
>     System.out.println (cache);
>   }
> }

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