16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
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 java.lang.invoke;
27
28 import static java.lang.invoke.MethodHandleStatics.UNSAFE;
29
30 final class VarHandles {
31
32 static VarHandle makeFieldHandle(MemberName f, Class<?> refc, Class<?> type, boolean isWriteAllowedOnFinalFields) {
33 if (!f.isStatic()) {
34 long foffset = MethodHandleNatives.objectFieldOffset(f);
35 if (!type.isPrimitive()) {
36 if (f.isFlatValue()) {
37 return f.isFinal() && !isWriteAllowedOnFinalFields
38 ? new VarHandleObjects.FlatValueFieldInstanceReadOnly(refc, foffset, type)
39 : new VarHandleObjects.FlatValueFieldInstanceReadWrite(refc, foffset, type);
40 } else {
41 return f.isFinal() && !isWriteAllowedOnFinalFields
42 ? new VarHandleObjects.FieldInstanceReadOnly(refc, foffset, type)
43 : new VarHandleObjects.FieldInstanceReadWrite(refc, foffset, type, f.canBeNull());
44 }
45 }
46 else if (type == boolean.class) {
47 return f.isFinal() && !isWriteAllowedOnFinalFields
48 ? new VarHandleBooleans.FieldInstanceReadOnly(refc, foffset)
49 : new VarHandleBooleans.FieldInstanceReadWrite(refc, foffset);
50 }
51 else if (type == byte.class) {
52 return f.isFinal() && !isWriteAllowedOnFinalFields
53 ? new VarHandleBytes.FieldInstanceReadOnly(refc, foffset)
54 : new VarHandleBytes.FieldInstanceReadWrite(refc, foffset);
55 }
56 else if (type == short.class) {
83 ? new VarHandleDoubles.FieldInstanceReadOnly(refc, foffset)
84 : new VarHandleDoubles.FieldInstanceReadWrite(refc, foffset);
85 }
86 else {
87 throw new UnsupportedOperationException();
88 }
89 }
90 else {
91 // TODO This is not lazy on first invocation
92 // and might cause some circular initialization issues
93
94 // Replace with something similar to direct method handles
95 // where a barrier is used then elided after use
96
97 if (UNSAFE.shouldBeInitialized(refc))
98 UNSAFE.ensureClassInitialized(refc);
99
100 Object base = MethodHandleNatives.staticFieldBase(f);
101 long foffset = MethodHandleNatives.staticFieldOffset(f);
102 if (!type.isPrimitive()) {
103 assert(!f.isFlatValue()); // static field is not flattened
104 return f.isFinal() && !isWriteAllowedOnFinalFields
105 ? new VarHandleObjects.FieldStaticReadOnly(base, foffset, type)
106 : new VarHandleObjects.FieldStaticReadWrite(base, foffset, type, f.canBeNull());
107 }
108 else if (type == boolean.class) {
109 return f.isFinal() && !isWriteAllowedOnFinalFields
110 ? new VarHandleBooleans.FieldStaticReadOnly(base, foffset)
111 : new VarHandleBooleans.FieldStaticReadWrite(base, foffset);
112 }
113 else if (type == byte.class) {
114 return f.isFinal() && !isWriteAllowedOnFinalFields
115 ? new VarHandleBytes.FieldStaticReadOnly(base, foffset)
116 : new VarHandleBytes.FieldStaticReadWrite(base, foffset);
117 }
118 else if (type == short.class) {
119 return f.isFinal() && !isWriteAllowedOnFinalFields
120 ? new VarHandleShorts.FieldStaticReadOnly(base, foffset)
121 : new VarHandleShorts.FieldStaticReadWrite(base, foffset);
122 }
123 else if (type == char.class) {
|
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
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 java.lang.invoke;
27
28 import static java.lang.invoke.MethodHandleStatics.UNSAFE;
29
30 final class VarHandles {
31
32 static VarHandle makeFieldHandle(MemberName f, Class<?> refc, Class<?> type, boolean isWriteAllowedOnFinalFields) {
33 if (!f.isStatic()) {
34 long foffset = MethodHandleNatives.objectFieldOffset(f);
35 if (!type.isPrimitive()) {
36 if (f.isFlattened()) {
37 return f.isFinal() && !isWriteAllowedOnFinalFields
38 ? new VarHandleObjects.FlatValueFieldInstanceReadOnly(refc, foffset, type)
39 : new VarHandleObjects.FlatValueFieldInstanceReadWrite(refc, foffset, type);
40 } else {
41 return f.isFinal() && !isWriteAllowedOnFinalFields
42 ? new VarHandleObjects.FieldInstanceReadOnly(refc, foffset, type)
43 : new VarHandleObjects.FieldInstanceReadWrite(refc, foffset, type, f.canBeNull());
44 }
45 }
46 else if (type == boolean.class) {
47 return f.isFinal() && !isWriteAllowedOnFinalFields
48 ? new VarHandleBooleans.FieldInstanceReadOnly(refc, foffset)
49 : new VarHandleBooleans.FieldInstanceReadWrite(refc, foffset);
50 }
51 else if (type == byte.class) {
52 return f.isFinal() && !isWriteAllowedOnFinalFields
53 ? new VarHandleBytes.FieldInstanceReadOnly(refc, foffset)
54 : new VarHandleBytes.FieldInstanceReadWrite(refc, foffset);
55 }
56 else if (type == short.class) {
83 ? new VarHandleDoubles.FieldInstanceReadOnly(refc, foffset)
84 : new VarHandleDoubles.FieldInstanceReadWrite(refc, foffset);
85 }
86 else {
87 throw new UnsupportedOperationException();
88 }
89 }
90 else {
91 // TODO This is not lazy on first invocation
92 // and might cause some circular initialization issues
93
94 // Replace with something similar to direct method handles
95 // where a barrier is used then elided after use
96
97 if (UNSAFE.shouldBeInitialized(refc))
98 UNSAFE.ensureClassInitialized(refc);
99
100 Object base = MethodHandleNatives.staticFieldBase(f);
101 long foffset = MethodHandleNatives.staticFieldOffset(f);
102 if (!type.isPrimitive()) {
103 assert(!f.isFlattened()); // static field is not flattened
104 return f.isFinal() && !isWriteAllowedOnFinalFields
105 ? new VarHandleObjects.FieldStaticReadOnly(base, foffset, type)
106 : new VarHandleObjects.FieldStaticReadWrite(base, foffset, type, f.canBeNull());
107 }
108 else if (type == boolean.class) {
109 return f.isFinal() && !isWriteAllowedOnFinalFields
110 ? new VarHandleBooleans.FieldStaticReadOnly(base, foffset)
111 : new VarHandleBooleans.FieldStaticReadWrite(base, foffset);
112 }
113 else if (type == byte.class) {
114 return f.isFinal() && !isWriteAllowedOnFinalFields
115 ? new VarHandleBytes.FieldStaticReadOnly(base, foffset)
116 : new VarHandleBytes.FieldStaticReadWrite(base, foffset);
117 }
118 else if (type == short.class) {
119 return f.isFinal() && !isWriteAllowedOnFinalFields
120 ? new VarHandleShorts.FieldStaticReadOnly(base, foffset)
121 : new VarHandleShorts.FieldStaticReadWrite(base, foffset);
122 }
123 else if (type == char.class) {
|