[Soot-list] Java 1.7 output

[Nate]

FWIW, it seems the tool I'm using looks for Java 7 input class files to
know if it should use invoke dynamic.

I have a JAR I run through JBCO (using only iii) and the resulting JAR
works. However, if I literally only change the class file version to 51
(Java 7) in ClassEnv, then the resulting JAR gives me "VerifyError:
Expecting a stackmap frame at branch target xxx". Any ideas why?

Thanks!
-Nate




On Sun, Feb 2, 2014 at 2:15 PM, Bodden, Eric
<eric.bodden at sit.fraunhofer.de>wrote:

> Thanks Phil.
>
> Well, we could add such an option but I am not sure there would be any
> more uses of it. To me it seems like the other tool is at fault really -
> the bytecodes should be identical.
>
> Eric
>
>
> On 02.02.2014, at 12:28, Nate <nathan.sweet at gmail.com> wrote:
>
> > Hi Phil,
> >
> > Thanks for the tip. I added requireJava7() to the end of the
> jas.ClassEnv constructor in Jasmin and I'm now getting Java 7 class files.
> >
> > Cheers!
> > -Nate
> >
> >
> >
> >
> > On Sun, Feb 2, 2014 at 4:29 AM, Phil Pratt-Szeliga <pcpratts at trifort.org>
> wrote:
> > Hello Nate,
> >
> > > I'm using Soot's JBCO. Is it possible for the class files output to be
> Java
> > > 7 (version 51)? I am running Soot from the Git develop branch and I
> see the
> > > class files output are Java 6 (version 50).
> >
> > If Eric agrees, you might be able to add an option to output Java 7
> > class files. If you look at the hotspot source [1] and search for
> > JAVA_7_VERSION, you will see that they only use this in instances
> > where they are doing more verification. I do not think there are any
> > changes in the class file format between the two versions besides the
> > version number.
> >
> > Phil Pratt-Szeliga
> > http://trifort.org/
> >
> > [1]
> http://hg.openjdk.java.net/jdk7/hotspot/hotspot/file/9b0ca45cd756/src/share/vm/classfile/classFileParser.cpp
> >
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>
> --
> Prof. Eric Bodden, Ph.D., http://sse.ec-spride.de/ http://bodden.de/
> Head of Secure Software Engineering  at Fraunhofer SIT, TU Darmstadt and
> EC SPRIDE
> Tel: +49 6151 16-75422    Fax: +49 6151 16-72051
> Room 3.2.14, Mornewegstr. 30, 64293 Darmstadt
>
>
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