34 * If the field is typed as an array, then all the non-null components
35 * of the array, of depth up to the rank of the field's array type,
36 * also count as component values.
37 * By extension, any variable (either array or field) which has annotated
38 * as stable is called a stable variable, and its non-null or non-zero
39 * value is called a stable value.
40 * <p>
41 * Since all fields begin with a default value of null for references
42 * (resp., zero for primitives), it follows that this annotation indicates
43 * that the first non-null (resp., non-zero) value stored in the field
44 * will never be changed.
45 * <p>
46 * If the field is not of an array type, there are no array elements,
47 * then the value indicated as stable is simply the value of the field.
48 * If the dynamic type of the field value is an array but the static type
49 * is not, the components of the array are <em>not</em> regarded as stable.
50 * <p>
51 * If the field is an array type, then both the field value and
52 * all the components of the field value (if the field value is non-null)
53 * are indicated to be stable.
54 * If the field type is an array type with rank {@code N > 1},
55 * then each component of the field value (if the field value is non-null),
56 * is regarded as a stable array of rank {@code N-1}.
57 * <p>
58 * Fields which are declared {@code final} may also be annotated as stable.
59 * Since final fields already behave as stable values, such an annotation
60 * indicates no additional information, unless the type of the field is
61 * an array type.
62 * <p>
63 * It is (currently) undefined what happens if a field annotated as stable
64 * is given a third value. In practice, if the JVM relies on this annotation
65 * to promote a field reference to a constant, it may be that the Java memory
66 * model would appear to be broken, if such a constant (the second value of the field)
67 * is used as the value of the field even after the field value has changed.
68 */
69 /* package-private */
70 @Target(ElementType.FIELD)
71 @Retention(RetentionPolicy.RUNTIME)
72 @interface Stable {
73 }
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34 * If the field is typed as an array, then all the non-null components
35 * of the array, of depth up to the rank of the field's array type,
36 * also count as component values.
37 * By extension, any variable (either array or field) which has annotated
38 * as stable is called a stable variable, and its non-null or non-zero
39 * value is called a stable value.
40 * <p>
41 * Since all fields begin with a default value of null for references
42 * (resp., zero for primitives), it follows that this annotation indicates
43 * that the first non-null (resp., non-zero) value stored in the field
44 * will never be changed.
45 * <p>
46 * If the field is not of an array type, there are no array elements,
47 * then the value indicated as stable is simply the value of the field.
48 * If the dynamic type of the field value is an array but the static type
49 * is not, the components of the array are <em>not</em> regarded as stable.
50 * <p>
51 * If the field is an array type, then both the field value and
52 * all the components of the field value (if the field value is non-null)
53 * are indicated to be stable.
54 * If the field type is an array type with rank {@code N > 1},
55 * then each component of the field value (if the field value is non-null),
56 * is regarded as a stable array of rank {@code N-1}.
57 * <p>
58 * Fields which are declared {@code final} may also be annotated as stable.
59 * Since final fields already behave as stable values, such an annotation
60 * indicates no additional information, unless the type of the field is
61 * an array type.
62 * <p>
63 * It is (currently) undefined what happens if a field annotated as stable
64 * is given a third value. In practice, if the JVM relies on this annotation
65 * to promote a field reference to a constant, it may be that the Java memory
66 * model would appear to be broken, if such a constant (the second value of the field)
67 * is used as the value of the field even after the field value has changed.
68 */
69 /* package-private */
70 @Target(ElementType.FIELD)
71 @Retention(RetentionPolicy.RUNTIME)
72 @interface Stable {
73 }
|