Re: Incompatible object argument for function call

Hi,

Any help here is much appreciated. I'm stuck with this error. I dont have this problem when I instrument the plain java Servlets. I get this error when I try to instrument the Struts Action classes.


Thanks,
ramanr

---- On Mon, 15 Nov 2010 19:07:43 +0530 Rajaraman Santhanam <[email protected]> wrote ---- 

Hi,

Am here again on some issue. Getting this error "Incompatible object argument for function call"


Here is what I'm trying to do. On method entry, I call a method to pass on the method details & parameters.

Label startLabel = new Label(); 
Label endLabel = new Label();
Label exceptionLabel = new Label();
mv.visitTryCatchBlock(startLabel, endLabel, exceptionLabel, "java/lang/Throwable");
mv.visitLabel(startLabel); mv.visitMethodInsn(INVOKESTATIC, "test/MyClass", "getInstance", "()Ltest/MyClass;"); mv.visitLdcInsn(tracerName);
mv.visitLdcInsn(className);
mv.visitLdcInsn(methodName);
mv.visitLdcInsn(methodDesc);
loadArgArray();
mv.visitMethodInsn(INVOKEVIRTUAL, "test/MyClass", "invoke", method_desc);
mv.visitLabel(endLabel); Label doneLabel = new Label();
mv.visitJumpInsn(GOTO, doneLabel);
mv.visitLabel(exceptionLabel);
mv.visitFrame(Opcodes.F_SAME1, 0, null, 1, new Object[] { "java/lang/Exception" }); 
mv.visitVarInsn(ASTORE, 1);
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Throwable", "printStackTrace", "()V");
mv.visitLabel(doneLabel); 

In on method exit:

try
{
 if(opcode != ATHROW)
 {
 onFinally(opcode);
 }
}
catch(Exception ex)
{
 ex.printStackTrace();
}


private void onFinally(int opcode)
{
Label doneLabel = new Label();
if(opcode == ATHROW)
{
dup();
Type eType = Type.getType(Throwable.class);
int exception = newLocal(eType);
storeLocal(exception, eType);
mv.visitMethodInsn(INVOKESTATIC, "test/MyClass", "getInstance", "()Ltest/MyClass;");
loadLocal(exception);
mv.visitMethodInsn(INVOKEVIRTUAL, "test/MyClass", "finish", "(Ljava/lang/Throwable;)V");
}
else
{
Type returnType = Type.getReturnType(methodDesc);
Type objectType = Type.getObjectType("java/lang/Object");
int returnVar = -1;
if(opcode != RETURN)
{
if(opcode == LRETURN || opcode == DRETURN)
{
dup2();
}
else
{
dup();
}
loadReturnValue(returnType); //this loads the primitive return value as object in the top of the operand stack 
returnVar = newLocal(returnType);
storeLocal(returnVar, returnType);
box(objectType);
}
mv.visitMethodInsn(INVOKESTATIC, "test/MyClass", "getInstance", "()Ltest/MyClass;");
mv.visitIntInsn(SIPUSH, opcode);
if(opcode == RETURN)
{
mv.visitInsn(ACONST_NULL);
}
else
{
loadLocal(returnVar);
}
mv.visitMethodInsn(INVOKEVIRTUAL, "test/MyClass", "finish", "(ILjava/lang/Object;)V");
}
visitLabel(doneLabel);
}

I know I'm missing something here. I tried hard but in vain. 


Any help is much appreciated.


Thanks,
ramanr

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