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 java.lang.invoke; 27 28 import java.lang.invoke.MethodHandles.Lookup; 29 import java.lang.reflect.Field; 30 import static java.lang.invoke.MethodHandleNatives.Constants.*; 31 import static java.lang.invoke.MethodHandleStatics.*; 32 import static java.lang.invoke.MethodHandles.Lookup.IMPL_LOOKUP; 33 import jdk.internal.ref.Cleaner; 34 35 /** 36 * The JVM interface for the method handles package is all here. 37 * This is an interface internal and private to an implementation of JSR 292. 38 * <em>This class is not part of the JSR 292 standard.</em> 39 * @author jrose 40 */ 41 class MethodHandleNatives { 42 43 private MethodHandleNatives() { } // static only 44 45 /// MemberName support 46 47 static native void init(MemberName self, Object ref); 48 static native void expand(MemberName self); 49 static native MemberName resolve(MemberName self, Class<?> caller) throws LinkageError; 50 static native int getMembers(Class<?> defc, String matchName, String matchSig, 51 int matchFlags, Class<?> caller, int skip, MemberName[] results); 52 53 /// Field layout queries parallel to jdk.internal.misc.Unsafe: 54 static native long objectFieldOffset(MemberName self); // e.g., returns vmindex 55 static native long staticFieldOffset(MemberName self); // e.g., returns vmindex 56 static native Object staticFieldBase(MemberName self); // e.g., returns clazz 57 static native Object getMemberVMInfo(MemberName self); // returns {vmindex,vmtarget} 58 59 /// CallSite support 60 61 /** Tell the JVM that we need to change the target of a CallSite. */ 62 static native void setCallSiteTargetNormal(CallSite site, MethodHandle target); 63 static native void setCallSiteTargetVolatile(CallSite site, MethodHandle target); 64 65 /** Represents a context to track nmethod dependencies on CallSite instance target. */ 66 static class CallSiteContext implements Runnable { 67 //@Injected JVM_nmethodBucket* vmdependencies; 68 69 static CallSiteContext make(CallSite cs) { 70 final CallSiteContext newContext = new CallSiteContext(); 71 // Cleaner is attached to CallSite instance and it clears native structures allocated for CallSite context. 72 // Though the CallSite can become unreachable, its Context is retained by the Cleaner instance (which is 73 // referenced from Cleaner class) until cleanup is performed. 74 Cleaner.create(cs, newContext); 75 return newContext; 76 } 77 78 @Override 79 public void run() { 80 MethodHandleNatives.clearCallSiteContext(this); 81 } 82 } 83 84 /** Invalidate all recorded nmethods. */ 85 private static native void clearCallSiteContext(CallSiteContext context); 86 87 private static native void registerNatives(); 88 static { 89 registerNatives(); 90 } 91 92 /** 93 * Compile-time constants go here. This collection exists not only for 94 * reference from clients, but also for ensuring the VM and JDK agree on the | 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 java.lang.invoke; 27 28 import java.lang.invoke.MethodHandles.Lookup; 29 import java.lang.reflect.Field; 30 import static java.lang.invoke.MethodHandleNatives.Constants.*; 31 import static java.lang.invoke.MethodHandleStatics.*; 32 import static java.lang.invoke.MethodHandles.Lookup.IMPL_LOOKUP; 33 import jdk.internal.ref.CleanerFactory; 34 35 /** 36 * The JVM interface for the method handles package is all here. 37 * This is an interface internal and private to an implementation of JSR 292. 38 * <em>This class is not part of the JSR 292 standard.</em> 39 * @author jrose 40 */ 41 class MethodHandleNatives { 42 43 private MethodHandleNatives() { } // static only 44 45 /// MemberName support 46 47 static native void init(MemberName self, Object ref); 48 static native void expand(MemberName self); 49 static native MemberName resolve(MemberName self, Class<?> caller) throws LinkageError; 50 static native int getMembers(Class<?> defc, String matchName, String matchSig, 51 int matchFlags, Class<?> caller, int skip, MemberName[] results); 52 53 /// Field layout queries parallel to jdk.internal.misc.Unsafe: 54 static native long objectFieldOffset(MemberName self); // e.g., returns vmindex 55 static native long staticFieldOffset(MemberName self); // e.g., returns vmindex 56 static native Object staticFieldBase(MemberName self); // e.g., returns clazz 57 static native Object getMemberVMInfo(MemberName self); // returns {vmindex,vmtarget} 58 59 /// CallSite support 60 61 /** Tell the JVM that we need to change the target of a CallSite. */ 62 static native void setCallSiteTargetNormal(CallSite site, MethodHandle target); 63 static native void setCallSiteTargetVolatile(CallSite site, MethodHandle target); 64 65 /** Represents a context to track nmethod dependencies on CallSite instance target. */ 66 static class CallSiteContext implements Runnable { 67 //@Injected JVM_nmethodBucket* vmdependencies; 68 69 static CallSiteContext make(CallSite cs) { 70 final CallSiteContext newContext = new CallSiteContext(); 71 // Cleaner is attached to CallSite instance and it clears native structures allocated for CallSite context. 72 // Though the CallSite can become unreachable, its Context is retained by the Cleaner instance (which is 73 // referenced from Cleaner class) until cleanup is performed. 74 CleanerFactory.cleaner().register(cs, newContext); 75 return newContext; 76 } 77 78 @Override 79 public void run() { 80 MethodHandleNatives.clearCallSiteContext(this); 81 } 82 } 83 84 /** Invalidate all recorded nmethods. */ 85 private static native void clearCallSiteContext(CallSiteContext context); 86 87 private static native void registerNatives(); 88 static { 89 registerNatives(); 90 } 91 92 /** 93 * Compile-time constants go here. This collection exists not only for 94 * reference from clients, but also for ensuring the VM and JDK agree on the |