2887 /**
2888 * Atomic operations support.
2889 */
2890 private static class Atomic {
2891 // initialize Unsafe machinery here, since we need to call Class.class instance method
2892 // and have to avoid calling it in the static initializer of the Class class...
2893 private static final Unsafe unsafe = Unsafe.getUnsafe();
2894 // offset of Class.reflectionData instance field
2895 private static final long reflectionDataOffset
2896 = unsafe.objectFieldOffset(Class.class, "reflectionData");
2897 // offset of Class.annotationType instance field
2898 private static final long annotationTypeOffset
2899 = unsafe.objectFieldOffset(Class.class, "annotationType");
2900 // offset of Class.annotationData instance field
2901 private static final long annotationDataOffset
2902 = unsafe.objectFieldOffset(Class.class, "annotationData");
2903
2904 static <T> boolean casReflectionData(Class<?> clazz,
2905 SoftReference<ReflectionData<T>> oldData,
2906 SoftReference<ReflectionData<T>> newData) {
2907 return unsafe.compareAndSetObject(clazz, reflectionDataOffset, oldData, newData);
2908 }
2909
2910 static <T> boolean casAnnotationType(Class<?> clazz,
2911 AnnotationType oldType,
2912 AnnotationType newType) {
2913 return unsafe.compareAndSetObject(clazz, annotationTypeOffset, oldType, newType);
2914 }
2915
2916 static <T> boolean casAnnotationData(Class<?> clazz,
2917 AnnotationData oldData,
2918 AnnotationData newData) {
2919 return unsafe.compareAndSetObject(clazz, annotationDataOffset, oldData, newData);
2920 }
2921 }
2922
2923 /**
2924 * Reflection support.
2925 */
2926
2927 // Reflection data caches various derived names and reflective members. Cached
2928 // values may be invalidated when JVM TI RedefineClasses() is called
2929 private static class ReflectionData<T> {
2930 volatile Field[] declaredFields;
2931 volatile Field[] publicFields;
2932 volatile Method[] declaredMethods;
2933 volatile Method[] publicMethods;
2934 volatile Constructor<T>[] declaredConstructors;
2935 volatile Constructor<T>[] publicConstructors;
2936 // Intermediate results for getFields and getMethods
2937 volatile Field[] declaredPublicFields;
2938 volatile Method[] declaredPublicMethods;
2939 volatile Class<?>[] interfaces;
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2887 /**
2888 * Atomic operations support.
2889 */
2890 private static class Atomic {
2891 // initialize Unsafe machinery here, since we need to call Class.class instance method
2892 // and have to avoid calling it in the static initializer of the Class class...
2893 private static final Unsafe unsafe = Unsafe.getUnsafe();
2894 // offset of Class.reflectionData instance field
2895 private static final long reflectionDataOffset
2896 = unsafe.objectFieldOffset(Class.class, "reflectionData");
2897 // offset of Class.annotationType instance field
2898 private static final long annotationTypeOffset
2899 = unsafe.objectFieldOffset(Class.class, "annotationType");
2900 // offset of Class.annotationData instance field
2901 private static final long annotationDataOffset
2902 = unsafe.objectFieldOffset(Class.class, "annotationData");
2903
2904 static <T> boolean casReflectionData(Class<?> clazz,
2905 SoftReference<ReflectionData<T>> oldData,
2906 SoftReference<ReflectionData<T>> newData) {
2907 return unsafe.compareAndSetReference(clazz, reflectionDataOffset, oldData, newData);
2908 }
2909
2910 static <T> boolean casAnnotationType(Class<?> clazz,
2911 AnnotationType oldType,
2912 AnnotationType newType) {
2913 return unsafe.compareAndSetReference(clazz, annotationTypeOffset, oldType, newType);
2914 }
2915
2916 static <T> boolean casAnnotationData(Class<?> clazz,
2917 AnnotationData oldData,
2918 AnnotationData newData) {
2919 return unsafe.compareAndSetReference(clazz, annotationDataOffset, oldData, newData);
2920 }
2921 }
2922
2923 /**
2924 * Reflection support.
2925 */
2926
2927 // Reflection data caches various derived names and reflective members. Cached
2928 // values may be invalidated when JVM TI RedefineClasses() is called
2929 private static class ReflectionData<T> {
2930 volatile Field[] declaredFields;
2931 volatile Field[] publicFields;
2932 volatile Method[] declaredMethods;
2933 volatile Method[] publicMethods;
2934 volatile Constructor<T>[] declaredConstructors;
2935 volatile Constructor<T>[] publicConstructors;
2936 // Intermediate results for getFields and getMethods
2937 volatile Field[] declaredPublicFields;
2938 volatile Method[] declaredPublicMethods;
2939 volatile Class<?>[] interfaces;
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