Re: ASM6 beta !

[Cedric send this privately but given the content, i suppose, he wanted to post it for everybody] 

> De: "Cédric Champeau" <[email protected]>
> À: "Remi Forax" <[email protected]>
> Envoyé: Lundi 17 Juillet 2017 17:30:07
> Objet: Re: [asm] ASM6 beta !

> Thanks, team!
> Just a side note, I encountered the first problem with jars embedding
> module-info, and it was with ASM 6 :) Basically tools scanning classpath like
> ProGuard choke on it. Expected, I guess...

yes, 
each ASM 6 jars contains a module-info.class, so you can do a 'requires org.objectweb.asm...' in your own module-info to use ASM as a module. 

It's a good idea for ProGuard to choke on the module-info. 
You have two kinds of tools that consume bytecodes, you have VMs and agents, those consume bytecode lazily thus will never see a module-info.class (apart if they follow the Java 9 spec), for other tools that scan jars, they will need to be updated to either skip the module-info or to read it (maybe with ASM *). 

In the case of ProGuard, it should read the module-info.class because 1/ it lists the exported packages, so the config of ProGuard can be simpler (before you add to explain which package was internal or not), 2/ the module-info reference services (interfaces and impls) that are classes, if those are renamed by ProGuard, the module-info need to be updated accordingly. 

Also, Cedric, do you have file a bug report to ProGuard ? I was not able to find it ? And feel free to link to that discussion. 

regards, 
Rémi 

* ProGuard does not use ASM to read/write the bytecode but its own codes. 

> 2017-07-16 16:36 GMT+02:00 Remi Forax < [ mailto:[email protected] |
> [email protected] ] > :

>> Hi all,
>> we, the ASM Team, are proud to announce the release of ASM6 Beta,
>> which include the support of the Java 9 classfile format.

>> Over the last month, we have (mostly Eric in fact) moved ASM out of SVN to Git,
>> the code source is now available at
>> [ https://gitlab.ow2.org/asm/ | https://gitlab.ow2.org/asm/ ]

>> The issues and the docs, etc have not yet migrated to OW2's Gitlab but will be
>> soon.

>> The binaries of the ASM6 beta releases are available on the Gforge:
>> [ http://forge.ow2.org/projects/asm/ | http://forge.ow2.org/projects/asm/ ]

>> Maven Central repository will be updated soon, we're still have a small issue
>> with the internal ow2 nexus due to the migration to Gitlab.

>> The ASM6_FUTURE branch has been merged to the master (ex trunk) so bug fixes,
>> etc, will be done in priority on ASM6.

>> ASM 6 release notes:
>> - add a new kind of visitor, ModuleVisitor that visit a module descriptor
>> (module-info)
>> - add a new API constant: Opcodes.ASM6
>> - support JDK specific attributes (ModuleTarget, ModuleHashes and
>> ModuleResolution) in asm.commons
>> - support PACKAGE and MODULE new constant pool entries (can be used by custom
>> attributes)
>> - update asm.tree by adding ModuleNode, ModuleRequireNode, ModuleExportNode,
>> ModuleOpenNode and ModuleProvideNode
>> - update ASMifier and the Trace visitors
>> - the remapper support to remap module name (and update ModuleHashes if present
>> accordingly)
>> - ASM jars are now modules too, most of the jars are still compatible with Java
>> 1.3, asm-xml is compatible with Java 1.4 and asm-all-debug is compatible with
>> Java 1.5
>> - does not work with javac 9 (yet !)

>> regards,
>> Rémi

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