Re: Problem with generating method

On 03/21/2011 12:49 PM, [email protected] wrote:
> i succeded in creating main method, and constructor
> but now i need to create new static method
> suppose i want do method:
> static public f(int x, int y)
> {
> return x*y;
> }
>
> based on my experience with other methods i wrote:
>
> mv = cw.visitMethod( Opcodes.ACC_PUBLIC+Opcodes.ACC_STATIC,
> f,"(II)I",null,null);
> mv.visitCode();
> mv.visitVarInsn(Opcodes.ILOAD, 0);
> mv.visitVarInsn(Opcodes.ILOAD, 1);
> mv.visitInsn(Opcodes.IMUL);
> mv.visitInsn(Opcodes.RETURN);

replace RETURN by IRETURN.

> mv.visitMaxs(0, 0);
> mv.visitEnd();
>
> disassebled code for this method is looks exactly as that one created from
> source code
> bur when i try run class (without using that method)
> a get
> (class: myClass, method: f signature (II)I)  Wrong return type in function
> can somebody tells me whad did i miss
> regards

There is a magic program named Asmifier that takes a .class and generate 
the code
that will generate the same .class
http://asm.ow2.org/doc/faq.html#Q10

Also the JVM spec that describes all opcodes is here:
http://java.sun.com/docs/books/jvms/second_edition/html/Instructions.doc.html

Rémi

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