compting of frame stack content

I replace the RETURN opcode of the methods by a GOTO "endLabel"
So in visitMaxs implementation method I have to generate the code as below:

methodVisitor.visitLabel(label2);
methodVisitor.visitFrame(F_SAME, 0, null, 1, new Object[]{XXX} );
methodVisitor.visitMethodInsn(
/**/INVOKESTATIC, JOAFIP_CALL_BACK,
/**/"methodEnd$JOAFIP$", LJAVA_LANG_OBJECT_V_DESC);
methodVisitor.visitInsn(returnOpcode);

my problem is how compute XXX according to the return type, since the value to return is in stack after the jump.

I know the return type using "Type returnType = Type.getReturnType(desc);" where desc is the method descriptor.

Regards
Luc

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