@SuppressWarnings("deprecation")
    private int readAnnotationValue(int v, final char[] buf) {
        switch (this.classReader.b[v] & 0xFF) {
            case 'e': // enum_const_value
                return v + 5;
            case '@': // annotation_value
                return readAnnotationValues(v + 3, buf, true);
            case '[': // array_value
                return readAnnotationValues(v + 1, buf, false);
            default:
                return v + 3;
        }
    }
Returns the start index of the attribute_info structure of this class.

@return the start index of the attribute_info structure of this class.
agent-module/profiler/src/main/java/com/navercorp/pinpoint/profiler/instrument/classreading/ClassReaderWrapper.java