21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package jdk.internal.reflect;
27
28 import java.lang.reflect.Field;
29 import java.lang.reflect.Modifier;
30 import jdk.internal.misc.Unsafe;
31
32 /** Base class for jdk.internal.misc.Unsafe-based FieldAccessors. The
33 observation is that there are only nine types of fields from the
34 standpoint of reflection code: the eight primitive types and
35 Object. Using class Unsafe instead of generated bytecodes saves
36 memory and loading time for the dynamically-generated
37 FieldAccessors. */
38
39 abstract class UnsafeFieldAccessorImpl extends FieldAccessorImpl {
40 static final Unsafe unsafe = Unsafe.getUnsafe();
41 private static final int FLAT_VALUE = 0x01;
42 private static final int CAN_BE_NULL = 0x10;
43
44 protected final Field field;
45 protected final long fieldOffset;
46 protected final boolean isFinal;
47 protected final int flags;
48
49 UnsafeFieldAccessorImpl(Field field) {
50 this.field = field;
51 if (Modifier.isStatic(field.getModifiers()))
52 this.fieldOffset = unsafe.staticFieldOffset(field);
53 else
54 this.fieldOffset = unsafe.objectFieldOffset(field);
55 this.isFinal = Modifier.isFinal(field.getModifiers());
56
57 int flags = 0;
58 if (ReflectionFactory.langReflectAccess().isFlatValue(field))
59 flags |= FLAT_VALUE;
60 if (ReflectionFactory.langReflectAccess().canBeNull(field))
61 flags |= CAN_BE_NULL;
62 this.flags = flags;
63 }
64
65 protected void ensureObj(Object o) {
66 // NOTE: will throw NullPointerException, as specified, if o is null
67 if (!field.getDeclaringClass().isAssignableFrom(o.getClass())) {
68 throwSetIllegalArgumentException(o);
69 }
70 }
71
72 protected boolean isFlatValue() {
73 return (flags & FLAT_VALUE) == FLAT_VALUE;
74 }
75
76 protected boolean canBeNull() {
77 return (flags & CAN_BE_NULL) == CAN_BE_NULL;
78 }
79
80 protected Object checkValue(Object value) {
81 if (!canBeNull() && value == null)
82 throw new NullPointerException(field + " cannot be set to null");
83
84 if (value != null) {
85 if (!field.getType().isAssignableFrom(value.getClass())) {
86 throwSetIllegalArgumentException(value);
87 }
88 }
89 return value;
90 }
91
92 private String getQualifiedFieldName() {
93 return field.getDeclaringClass().getName() + "." +field.getName();
94 }
95
96 protected IllegalArgumentException newGetIllegalArgumentException(String type) {
97 return new IllegalArgumentException(
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package jdk.internal.reflect;
27
28 import java.lang.reflect.Field;
29 import java.lang.reflect.Modifier;
30 import jdk.internal.misc.Unsafe;
31
32 /** Base class for jdk.internal.misc.Unsafe-based FieldAccessors. The
33 observation is that there are only nine types of fields from the
34 standpoint of reflection code: the eight primitive types and
35 Object. Using class Unsafe instead of generated bytecodes saves
36 memory and loading time for the dynamically-generated
37 FieldAccessors. */
38
39 abstract class UnsafeFieldAccessorImpl extends FieldAccessorImpl {
40 static final Unsafe unsafe = Unsafe.getUnsafe();
41
42 protected final Field field;
43 protected final long fieldOffset;
44 protected final boolean isFinal;
45
46 UnsafeFieldAccessorImpl(Field field) {
47 this.field = field;
48 if (Modifier.isStatic(field.getModifiers()))
49 this.fieldOffset = unsafe.staticFieldOffset(field);
50 else
51 this.fieldOffset = unsafe.objectFieldOffset(field);
52 this.isFinal = Modifier.isFinal(field.getModifiers());
53 }
54
55 protected void ensureObj(Object o) {
56 // NOTE: will throw NullPointerException, as specified, if o is null
57 if (!field.getDeclaringClass().isAssignableFrom(o.getClass())) {
58 throwSetIllegalArgumentException(o);
59 }
60 }
61
62 protected boolean isFlattened() {
63 return unsafe.isFlattened(field);
64 }
65
66 protected boolean canBeNull() {
67 return field.getType() == field.getType().asBoxType();
68 }
69
70 protected Object checkValue(Object value) {
71 if (!canBeNull() && value == null)
72 throw new NullPointerException(field + " cannot be set to null");
73
74 if (value != null) {
75 if (!field.getType().isAssignableFrom(value.getClass())) {
76 throwSetIllegalArgumentException(value);
77 }
78 }
79 return value;
80 }
81
82 private String getQualifiedFieldName() {
83 return field.getDeclaringClass().getName() + "." +field.getName();
84 }
85
86 protected IllegalArgumentException newGetIllegalArgumentException(String type) {
87 return new IllegalArgumentException(
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