Re: Re: Retrieving the object reference of the return value or exception in onMethodExit

Since you mentioned, it very obvious :-) 
Thanks, Eric.

--- On Fri, 2/11/11, Eric Bruneton <[email protected]> wrote:

From: Eric Bruneton <[email protected]>
Subject: [asm] Re: Retrieving the object reference of the return value or exception in onMethodExit
To: "[email protected]" <[email protected]>
Date: Friday, February 11, 2011, 10:28 AM

11/02/2011 03:06, Buu Vinh wrote:
> Since the top element of the stack contains the return value or the
> exception instance, I tried to retrieve them in onMethodExit, but it
> resulted in stack exception. Please advice.
>
> protected void onMethodExit(int opcode){
>
> if (opcode == ATHROW){
> mv.visitInsn(DUP);
> mv.visitVarInsn(ASTORE, exceptionIndex); // Stores exception in local
> variable
> }
> else {
> mv.visitInsn(ACONST_NULL);
> mv.visitVarInsn(ASTORE, exceptionIndex);
> if (opcode == ARETURN) {
> mv.visitInsn(DUP);
> mv.visitVarInsn(ASTORE, returnValueIndex); // Stores return value in
> local variable
> }
> }
> mv.visitVarInsn(ALOAD, myClassIndex);
> mv.visitVarInsn(ALOAD, exceptionIndex); // passes them to MyClass
> mv.visitVarInsn(ASTORE, returnValueIndex);

I think the line above should use ALOAD instead of ASTORE

> mv.visitMethodInsn(INVOKEVIRTUAL, "com/bv/MyClass", "myMethod",
> "(Ljava/lang/Throwable;Ljava/lang/Object;)V");

Eric

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