src/java.base/share/classes/java/lang/invoke/Invokers.java

rev 47249 : 8187826: Avoid using reflection to bootstrap NamedFunctions
Reviewed-by: TBD

*** 609,643 ****
  
      private static NamedFunction createFunction(byte func) {
          try {
              switch (func) {
                  case NF_checkExactType:
!                     return new NamedFunction(Invokers.class
!                         .getDeclaredMethod("checkExactType", MethodHandle.class,  MethodType.class));
                  case NF_checkGenericType:
!                     return new NamedFunction(Invokers.class
!                         .getDeclaredMethod("checkGenericType", MethodHandle.class,  MethodType.class));
                  case NF_getCallSiteTarget:
!                     return new NamedFunction(Invokers.class
!                         .getDeclaredMethod("getCallSiteTarget", CallSite.class));
                  case NF_checkCustomized:
!                     return new NamedFunction(Invokers.class
!                         .getDeclaredMethod("checkCustomized", MethodHandle.class));
                  case NF_checkVarHandleGenericType:
!                     return new NamedFunction(Invokers.class
!                         .getDeclaredMethod("checkVarHandleGenericType", VarHandle.class, VarHandle.AccessDescriptor.class));
                  case NF_checkVarHandleExactType:
!                     return new NamedFunction(Invokers.class
!                         .getDeclaredMethod("checkVarHandleExactType", VarHandle.class, VarHandle.AccessDescriptor.class));
                  default:
                      throw newInternalError("Unknown function: " + func);
              }
          } catch (ReflectiveOperationException ex) {
              throw newInternalError(ex);
          }
      }
  
      private static class Lazy {
          private static final MethodHandle MH_asSpreader;
  
          static {
              try {
--- 609,646 ----
  
      private static NamedFunction createFunction(byte func) {
          try {
              switch (func) {
                  case NF_checkExactType:
!                     return getNamedFunction("checkExactType", MethodType.methodType(void.class, MethodHandle.class, MethodType.class));
                  case NF_checkGenericType:
!                     return getNamedFunction("checkGenericType", MethodType.methodType(MethodHandle.class, MethodHandle.class, MethodType.class));
                  case NF_getCallSiteTarget:
!                     return getNamedFunction("getCallSiteTarget", MethodType.methodType(MethodHandle.class, CallSite.class));
                  case NF_checkCustomized:
!                     return getNamedFunction("checkCustomized", MethodType.methodType(void.class, MethodHandle.class));
                  case NF_checkVarHandleGenericType:
!                     return getNamedFunction("checkVarHandleGenericType", MethodType.methodType(MethodHandle.class, VarHandle.class, VarHandle.AccessDescriptor.class));
                  case NF_checkVarHandleExactType:
!                     return getNamedFunction("checkVarHandleExactType", MethodType.methodType(MethodHandle.class, VarHandle.class, VarHandle.AccessDescriptor.class));
                  default:
                      throw newInternalError("Unknown function: " + func);
              }
          } catch (ReflectiveOperationException ex) {
              throw newInternalError(ex);
          }
      }
  
+     private static NamedFunction getNamedFunction(String name, MethodType type)
+         throws ReflectiveOperationException
+     {
+         MemberName member = new MemberName(Invokers.class, name, type, REF_invokeStatic);
+         return new NamedFunction(
+                 MemberName.getFactory()
+                         .resolveOrFail(REF_invokeStatic, member, Invokers.class, NoSuchMethodException.class));
+     }
+ 
      private static class Lazy {
          private static final MethodHandle MH_asSpreader;
  
          static {
              try {