Looking to rewrite some bytecodes...

Ask Keith? Sounds exactly like what he did with his null checker.

Dave Griffith schrieb:

I'm playing around with a couple ideas I had for dynamic program analysis, and looking to write a plugin.

1)I have a bytecode rewriter, and I want it to sit IDEAs compilation path. That is, after IDEA compiles a .class file, it should then mutate that file in-place, using my bytecode rewriter. It looks like the Compiler API should allow this (ClassInstrumentingCompiler?), but I honestly can't figure out how. Any pointers or code examples would be greatly appreciated.

2)When the rewritten code is run (using any command-line run configuration), it will communicate with a small runtime library I've written. This runtime library needs to be automatically added to the classpath, and a configuration string needs to be passed to it as a command-line system property. Both of these should happen without the user being aware of it. Again, any pointers or examples would be great.

(No, I won't say what I'm doing with the instrumentation. Trust me, it'll be wicked cool if it works.)

Thanks.

--Dave Griffith

Hello Dave,

1)I have a bytecode rewriter, and I want it to sit IDEAs compilation
path. That is, after IDEA compiles a .class file, it should then
mutate that file in-place, using my bytecode rewriter. It looks like
the Compiler API should allow this (ClassInstrumentingCompiler?), but
I honestly can't figure out how. Any pointers or code examples would
be greatly appreciated.

Maybe GUI Designer?

I'm pretty sure Keith rewrote at the source level, not the class file level. Nonetheless I was certainly hoping to learn his experiences.

--Dave Griffith

Part 2 sounds related to what I'm doing for the JProfiler plugin. Please
contact me by mail if you want any assistance.

Dave Griffith wrote:

I'm playing around with a couple ideas I had for dynamic program analysis, and looking to write a plugin.

1)I have a bytecode rewriter, and I want it to sit IDEAs compilation path. That is, after IDEA compiles a .class file, it should then mutate that file in-place, using my bytecode rewriter. It looks like the Compiler API should allow this (ClassInstrumentingCompiler?), but I honestly can't figure out how. Any pointers or code examples would be greatly appreciated.

2)When the rewritten code is run (using any command-line run configuration), it will communicate with a small runtime library I've written. This runtime library needs to be automatically added to the classpath, and a configuration string needs to be passed to it as a command-line system property. Both of these should happen without the user being aware of it. Again, any pointers or examples would be great.

(No, I won't say what I'm doing with the instrumentation. Trust me, it'll be wicked cool if it works.)

Thanks.

--Dave Griffith

--
Martin Fuhrer
Fuhrer Engineering AG
http://www.fuhrer.com

Dave Griffith wrote:

I'm pretty sure Keith rewrote at the source level, not the class file
level. Nonetheless I was certainly hoping to learn his experiences.

You're correct, I use a source instrumenting compiler. I haven't used it
but I think you could use a ClassInstrumentingCompiler (I believe this
is what the GUI designer uses). In a project component, I do this:

compilerManager = CompilerManager.getInstance(project);
nullChecker = new NullyCompilerStep(project);
compilerManager.addCompiler(nullChecker);

In my case NullyCompilerStep implements JavaSourceInstrumentingCompiler.