Examples of org.objectweb.asm.CodeVisitor.visitLabel()

org.objectweb.asm.CodeVisitor.visitLabel()
Visits a label. A label designates the instruction that will be visited just after it. @param label a {@link Label Label} object.

        cv.visitLabel(l0);
        cv.visitLdcInsn(calleeClassName.replace('/', '.'));
        cv.visitMethodInsn(INVOKESTATIC, CLASS_CLASS, FOR_NAME_METHOD_NAME, FOR_NAME_METHOD_SIGNATURE);
        cv.visitFieldInsn(PUTSTATIC, joinPointClassName, TARGET_CLASS_FIELD_NAME, CLASS_CLASS_SIGNATURE);
        Label l1 = new Label();
        cv.visitLabel(l1);
        Label l2 = new Label();
        cv.visitJumpInsn(GOTO, l2);
        Label l3 = new Label();
        cv.visitLabel(l3);
        cv.visitVarInsn(ASTORE, 0);

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        Label l1 = new Label();
        cv.visitLabel(l1);
        Label l2 = new Label();
        cv.visitJumpInsn(GOTO, l2);
        Label l3 = new Label();
        cv.visitLabel(l3);
        cv.visitVarInsn(ASTORE, 0);
        cv.visitTypeInsn(NEW, RUNTIME_EXCEPTION_CLASS_NAME);
        cv.visitInsn(DUP);
        cv.visitLdcInsn("could not load target class using Class.forName() in generated join point base class");
        cv.visitMethodInsn(INVOKESPECIAL,

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        cv.visitMethodInsn(INVOKESPECIAL,
                RUNTIME_EXCEPTION_CLASS_NAME,
                INIT_METHOD_NAME,
                RUNTIME_EXCEPTION_INIT_METHOD_SIGNATURE);
        cv.visitInsn(ATHROW);
        cv.visitLabel(l2);


        cv.visitFieldInsn(GETSTATIC, joinPointClassName, TARGET_CLASS_FIELD_NAME, CLASS_CLASS_SIGNATURE);
        cv.visitMethodInsn(INVOKESTATIC,
                SYSTEM_LOADER_CLASS_NAME,
                GET_SYSTEM_METHOD_NAME,

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        incrementStackFrameCounter(cv, className);
        Labels labels = invokeAdvice(cv, className, aroundAdvice, beforeAdvice, afterAdvice, signatureCflowExprStruct, joinPointType);
        resetStackFrameCounter(cv, className);
        invokeJoinPoint(joinPointType, declaringClass, joinPointHash, cv, className);
        cv.visitInsn(Constants.ARETURN);
        cv.visitLabel(labels.handlerLabel);
        cv.visitVarInsn(Constants.ASTORE, 2);
        cv.visitLabel(labels.endLabel);
        cv.visitVarInsn(Constants.ALOAD, 0);
        cv.visitInsn(Constants.ICONST_M1);
        cv.visitFieldInsn(Constants.PUTFIELD, className, STACKFRAME_FIELD_NAME, I);

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        resetStackFrameCounter(cv, className);
        invokeJoinPoint(joinPointType, declaringClass, joinPointHash, cv, className);
        cv.visitInsn(Constants.ARETURN);
        cv.visitLabel(labels.handlerLabel);
        cv.visitVarInsn(Constants.ASTORE, 2);
        cv.visitLabel(labels.endLabel);
        cv.visitVarInsn(Constants.ALOAD, 0);
        cv.visitInsn(Constants.ICONST_M1);
        cv.visitFieldInsn(Constants.PUTFIELD, className, STACKFRAME_FIELD_NAME, I);
        cv.visitVarInsn(Constants.ALOAD, 2);
        cv.visitInsn(Constants.ATHROW);

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        for (int i = 0; i < returnLabels.length; i++) {
            returnLabels[i] = new Label();
        }


        // start try-catch block
        cv.visitLabel(tryLabel);


        // start the switch block and set the stackframe as the param to the switch
        cv.visitVarInsn(ALOAD, 0);
        cv.visitFieldInsn(GETFIELD, joinPointClassName, STACK_FRAME_FIELD_NAME, I);
        cv.visitLookupSwitchInsn(defaultCaseLabel, caseNumbers, caseLabels);

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                NO_PARAM_RETURN_VOID_SIGNATURE,
                null, null
        );


        Label tryLabel = new Label();
        cv.visitLabel(tryLabel);
        cv.visitLdcInsn(m_calleeClassName.replace('/', '.'));
        cv.visitMethodInsn(INVOKESTATIC, CLASS_CLASS, FOR_NAME_METHOD_NAME, FOR_NAME_METHOD_SIGNATURE);
        cv.visitFieldInsn(PUTSTATIC, m_joinPointClassName, TARGET_CLASS_FIELD_NAME, CLASS_CLASS_SIGNATURE);


        Label finallyLabel = new Label();

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        cv.visitLdcInsn(m_calleeClassName.replace('/', '.'));
        cv.visitMethodInsn(INVOKESTATIC, CLASS_CLASS, FOR_NAME_METHOD_NAME, FOR_NAME_METHOD_SIGNATURE);
        cv.visitFieldInsn(PUTSTATIC, m_joinPointClassName, TARGET_CLASS_FIELD_NAME, CLASS_CLASS_SIGNATURE);


        Label finallyLabel = new Label();
        cv.visitLabel(finallyLabel);


        Label gotoFinallyLabel = new Label();
        cv.visitJumpInsn(GOTO, gotoFinallyLabel);


        Label catchLabel = new Label();

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        Label gotoFinallyLabel = new Label();
        cv.visitJumpInsn(GOTO, gotoFinallyLabel);


        Label catchLabel = new Label();
        cv.visitLabel(catchLabel);
        cv.visitVarInsn(ASTORE, 0);
        cv.visitTypeInsn(NEW, RUNTIME_EXCEPTION_CLASS_NAME);
        cv.visitInsn(DUP);
        cv.visitLdcInsn("could not load target class using Class.forName() in generated join point base class");

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                INIT_METHOD_NAME,
                RUNTIME_EXCEPTION_INIT_METHOD_SIGNATURE
        );


        cv.visitInsn(ATHROW);
        cv.visitLabel(gotoFinallyLabel);


        // create the metadata map
        cv.visitTypeInsn(NEW, HASH_MAP_CLASS_NAME);
        cv.visitInsn(DUP);
        cv.visitMethodInsn(INVOKESPECIAL, HASH_MAP_CLASS_NAME, INIT_METHOD_NAME, NO_PARAM_RETURN_VOID_SIGNATURE);

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