10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
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 sun.reflect;
27
28 import java.security.AccessController;
29 import java.security.PrivilegedAction;
30 import sun.misc.Unsafe;
31
32 /** Utility class which assists in calling Unsafe.defineClass() by
33 creating a new class loader which delegates to the one needed in
34 order for proper resolution of the given bytecodes to occur. */
35
36 class ClassDefiner {
37 static final Unsafe unsafe = Unsafe.getUnsafe();
38
39 /** <P> We define generated code into a new class loader which
40 delegates to the defining loader of the target class. It is
41 necessary for the VM to be able to resolve references to the
42 target class from the generated bytecodes, which could not occur
43 if the generated code was loaded into the bootstrap class
44 loader. </P>
45
46 <P> There are two primary reasons for creating a new loader
47 instead of defining these bytecodes directly into the defining
48 loader of the target class: first, it avoids any possible
49 security risk of having these bytecodes in the same loader.
50 Second, it allows the generated bytecodes to be unloaded earlier
|
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
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 sun.reflect;
27
28 import java.security.AccessController;
29 import java.security.PrivilegedAction;
30 import jdk.internal.misc.Unsafe;
31
32 /** Utility class which assists in calling Unsafe.defineClass() by
33 creating a new class loader which delegates to the one needed in
34 order for proper resolution of the given bytecodes to occur. */
35
36 class ClassDefiner {
37 static final Unsafe unsafe = Unsafe.getUnsafe();
38
39 /** <P> We define generated code into a new class loader which
40 delegates to the defining loader of the target class. It is
41 necessary for the VM to be able to resolve references to the
42 target class from the generated bytecodes, which could not occur
43 if the generated code was loaded into the bootstrap class
44 loader. </P>
45
46 <P> There are two primary reasons for creating a new loader
47 instead of defining these bytecodes directly into the defining
48 loader of the target class: first, it avoids any possible
49 security risk of having these bytecodes in the same loader.
50 Second, it allows the generated bytecodes to be unloaded earlier
|