invokedynamic about obfuscator

[superblaubeere27]

Can you tell me how Invokedynamic obfuscation works? Then I would add it.

It replaces method invocations (and sometimes field accesses) with an invokedynamic opcode which was introduced in java 7. The invokedynamic bootstrap returns a CallSite containing a MethodHandle to the target we want to invoke/access.

Virtual invocations use an objectref to invoke upon the object they are instantiated upon so you need to account for this by adding an extra object parameter into the invokedynamic bootstrap (another issue with your invokedynamic transformer, you forgot to account for objectref on stack).

The array issue is an bug/issue with the hotspot so it's generally casted.

[superblaubeere27]

Ok

[superblaubeere27]

@ByteCode-Dan Can you send me a documentation of invokedynamic? I will start with it

Hmmm, there isn't much documentation on it.

https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.10.1.9.invokedynamic

[superblaubeere27]

I am working on it. If there's no error, I will commit the changes today.

[superblaubeere27]

@ByteCode-Dan Got it. Start the obfuscator with --invokeDynamic. https://github.com/superblaubeere27/obfuscator/releases

[ItzSomebody]

@superblaubeere27 Just tested it, seems fine to me.

[superblaubeere27]

• Field access obfuscation