Re: Help inserting instructions - simple question

[Toby Reyelts]

I think BCEL assumes you have a very good understanding of the VM spec. 
If you don't, you probably shouldn't be writing bytecode (or using 
BCEL). Working with that assumption, the documentation is mostly "ok", 
though there are places that could use clarification.

God bless,
-Toby
Al wrote:

Just thought I should give this some closure. Following Eriks instructions
and looking up the jvm spec I realised that
InstructionsFactory.createNewArray doesnt do the whole job. It expects the
length of the array to be on the stack. Simple really. Seriously though lads
... BCEL is desperately in need of some proper documentation if its ever
going to achieve its potential. Am I alone in feeling that this should be
one of, if not the, priority for its maintainers/developers (easy to say I
know when youre not one of them!)?
Best of luck,

Alan

----- Original Message ----- 
From: "Erik Corry" <[EMAIL PROTECTED]>
To: "BCEL Users List" <[EMAIL PROTECTED]>
Sent: Wednesday, January 14, 2004 9:00 PM
Subject: Re: Help inserting instructions - simple question

 

On Wed, Jan 14, 2004 at 08:33:48PM -0000, Al wrote:
   

Will somone please take a quick look at the example below. I am trying
     

to modify each method in a class s.t. the first thing it does is allocate a
new byte[] (for the moment Im happy to just create it and let it go, ... I
mean I dont need to bind it to anything). I dont understand what more I am
supposed to do to insert instructions in a method. This code will result in
an error like -
 

Exception in thread "main" java.lang.VerifyError: (class:
     

tests/test1/Test, method: main signature: ([Ljava/lang/String;)V) Unable to
pop operand off an empty stack
 

Probably the best thing is to run either

java org.apache.bcel.util.Class2HTML mymodifiedclassfile.class

or

java org.apache.bcel.verifier.Verifier mymodifiedclassfile.class

and look at the output until you can see where you are getting a stack
underflow.
--
Erik Corry         I'd be a Libertarian, if they weren't all a
[EMAIL PROTECTED]     bunch of tax-dodging professional whiners.   - B.
   

Breathed.
 

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