Bug 6163 - anonymous class verifier error
Summary: anonymous class verifier error
Status: RESOLVED FIXED
Alias: None
Product: gcc
Classification: Unclassified
Component: java (show other bugs)
Version: 3.1
: P3 normal
Target Milestone: ---
Assignee: Tom Tromey
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2002-04-03 16:36 UTC by Nic Ferrier
Modified: 2004-10-28 18:20 UTC (History)
4 users (show)

See Also:
Host:
Target:
Build:
Known to work:
Known to fail:
Last reconfirmed:


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Description Nic Ferrier 2002-04-03 16:36:01 UTC
When compiling to byte-code source with anonymous classes GCJ produces code which causes verifier errors with Sun's interpreter.



Note: this is stopping me reporting another anonymous classes bug for which I'm trying to produce a good test case.

Release:
3.1 20020403 (prerelease)

Environment:
linux-ppc

How-To-Repeat:
Compile the attached code thus:



   gcj -C -d . -classpath . A.java test.java



And then execute:



   java test



With GCJ you get this:



Exception in thread "main" java.lang.VerifyError: (class: test$1, method: <init> signature: (Ltest;Ljava/lang/String;IZ)V) Expecting to find object/array on stack

        at test.main(test.java:15)



With Sun's javac it compiles and runs quite happily. You should see the following output:



some overridden value
Comment 1 Tom Tromey 2002-04-07 18:34:33 UTC
From: Tom Tromey <tromey@redhat.com>
To: nferrier@tapsellferrier.co.uk
Cc: gcc-gnats@gcc.gnu.org
Subject: Re: java/6163: anonymous class verifier error
Date: 07 Apr 2002 18:34:33 -0600

 >>>>> "Nic" == Nic Ferrier <nferrier@tapsellferrier.co.uk> writes:
 
 Nic> Compile the attached code thus:
 Nic>    gcj -C -d . -classpath . A.java test.java
 
 Hi Nic.  I don't see any attached source code.
 Could you send it?
 
 Tom

Comment 2 Nic Ferrier 2002-04-08 09:34:39 UTC
From: Nic Ferrier <nferrier@tapsellferrier.co.uk>
To: tromey@redhat.com
Cc: gcc-gnats@gcc.gnu.org
Subject: Re: java/6163: anonymous class verifier error
Date: 08 Apr 2002 09:34:39 +0100

 --=-=-=
 
 Tom Tromey <tromey@redhat.com> writes:
 
 > >>>>> "Nic" == Nic Ferrier <nferrier@tapsellferrier.co.uk> writes: 
 >  
 > Nic> Compile the attached code thus: 
 > Nic>    gcj -C -d . -classpath . A.java test.java 
 >  
 > Hi Nic.  I don't see any attached source code. 
 > Could you send it? 
 >  
  Hmmm... I'm sure I added it. Here it is anyway:
 
 
 
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 --=-=-=
 
 
 
 
 Nic
 
 --=-=-=--
 

Comment 3 Tom Tromey 2002-04-08 11:35:54 UTC
From: Tom Tromey <tromey@redhat.com>
To: nferrier@tapsellferrier.co.uk
Cc: gcc-gnats@gcc.gnu.org
Subject: Re: java/6163: anonymous class verifier error
Date: 08 Apr 2002 11:35:54 -0600

 >>>>> "Nic" == Nic Ferrier <nferrier@tapsellferrier.co.uk> writes:
 
 Nic> When compiling to byte-code source with anonymous classes GCJ
 Nic> produces code which causes verifier errors with Sun's
 Nic> interpreter.
 
 I looked at this.
 
 Are you using the 1.2 JDK?
 
 Sun changed the verifier a bit between 1.2 and 1.4.  In particular
 they added a special exception for field initialization in <init>
 methods.
 
 This change is the root of the problem you are seeing.  When I run the
 `gcj -C' output against the 1.2 java interpreter, I get a verification
 error.  When I use the 1.4 interpreter, it works.  It also works with
 gij (gij specifically implements this particular verifier change).
 
 Inspecting the <init> method in test$1.class, I see that the code in
 question is definitely one of these field assignments.
 
 So my current thinking is that this is not a bug.  What do you think?
 
 Tom
Comment 4 Tom Tromey 2002-05-06 15:46:19 UTC
Responsible-Changed-From-To: unassigned->tromey
Responsible-Changed-Why: I'm handling this.
Comment 5 Tom Tromey 2002-05-06 15:46:19 UTC
State-Changed-From-To: open->closed
State-Changed-Why: I think this isn't a bug, as mentioned earlier.
    Nic agreed in a private reply.
Comment 6 Phil Shaw 2004-10-28 12:59:10 UTC
Is this a final verdict on this issue? This problem also affects compatibility 
with the Sun 1.3 interpreter. Can I take it that the Sun 1.4 interpreter is the 
benchmark reference for GCJ going forward?

Thanks.

Phil
Comment 7 Tom Tromey 2004-10-28 18:20:16 UTC
Nobody is planning to add backward compatibility code here.
The exception was added to the 1.4 verifier because it wasn't
possible to correctly compile valid java programs without it.
So, targeting 1.4 makes the most sense IMO.

If someone wanted to write a patch to provide 1.2 compatibility
in some subset of cases, and made this conditional on a command-line
switch, we may accept it.