29 import java.security.PrivilegedAction;
  30 import sun.misc.Unsafe;
  31 
  32 /**
  33  * This class consists exclusively of static names internal to the
  34  * method handle implementation.
  35  * Usage:  {@code import static java.lang.invoke.MethodHandleStatics.*}
  36  * @author John Rose, JSR 292 EG
  37  */
  38 /*non-public*/ class MethodHandleStatics {
  39 
  40     private MethodHandleStatics() { }  // do not instantiate
  41 
  42     static final Unsafe UNSAFE = Unsafe.getUnsafe();
  43 
  44     static final boolean DEBUG_METHOD_HANDLE_NAMES;
  45     static final boolean DUMP_CLASS_FILES;
  46     static final boolean TRACE_INTERPRETER;
  47     static final boolean TRACE_METHOD_LINKAGE;
  48     static final Integer COMPILE_THRESHOLD;


  49     static {
  50         final Object[] values = { false, false, false, false, null };
  51         AccessController.doPrivileged(new PrivilegedAction<Void>() {
  52                 public Void run() {
  53                     values[0] = Boolean.getBoolean("java.lang.invoke.MethodHandle.DEBUG_NAMES");
  54                     values[1] = Boolean.getBoolean("java.lang.invoke.MethodHandle.DUMP_CLASS_FILES");
  55                     values[2] = Boolean.getBoolean("java.lang.invoke.MethodHandle.TRACE_INTERPRETER");
  56                     values[3] = Boolean.getBoolean("java.lang.invoke.MethodHandle.TRACE_METHOD_LINKAGE");
  57                     values[4] = Integer.getInteger("java.lang.invoke.MethodHandle.COMPILE_THRESHOLD");


  58                     return null;
  59                 }
  60             });
  61         DEBUG_METHOD_HANDLE_NAMES = (Boolean) values[0];
  62         DUMP_CLASS_FILES          = (Boolean) values[1];
  63         TRACE_INTERPRETER         = (Boolean) values[2];
  64         TRACE_METHOD_LINKAGE      = (Boolean) values[3];
  65         COMPILE_THRESHOLD         = (Integer) values[4];

  66     }
  67 
  68     /** Tell if any of the debugging switches are turned on.
  69      *  If this is the case, it is reasonable to perform extra checks or save extra information.
  70      */
  71     /*non-public*/ static boolean debugEnabled() {
  72         return (DEBUG_METHOD_HANDLE_NAMES |
  73                 DUMP_CLASS_FILES |
  74                 TRACE_INTERPRETER |
  75                 TRACE_METHOD_LINKAGE);
  76     }
  77 
  78     /*non-public*/ static String getNameString(MethodHandle target, MethodType type) {
  79         if (type == null)
  80             type = target.type();
  81         MemberName name = null;
  82         if (target != null)
  83             name = target.internalMemberName();
  84         if (name == null)
  85             return "invoke" + type;

  29 import java.security.PrivilegedAction;
  30 import sun.misc.Unsafe;
  31 
  32 /**
  33  * This class consists exclusively of static names internal to the
  34  * method handle implementation.
  35  * Usage:  {@code import static java.lang.invoke.MethodHandleStatics.*}
  36  * @author John Rose, JSR 292 EG
  37  */
  38 /*non-public*/ class MethodHandleStatics {
  39 
  40     private MethodHandleStatics() { }  // do not instantiate
  41 
  42     static final Unsafe UNSAFE = Unsafe.getUnsafe();
  43 
  44     static final boolean DEBUG_METHOD_HANDLE_NAMES;
  45     static final boolean DUMP_CLASS_FILES;
  46     static final boolean TRACE_INTERPRETER;
  47     static final boolean TRACE_METHOD_LINKAGE;
  48     static final Integer COMPILE_THRESHOLD;
  49     static final int PROFILE_LEVEL;
  50 
  51     static {
  52         final Object[] values = { false, false, false, false, null, null };
  53         AccessController.doPrivileged(new PrivilegedAction<Void>() {
  54                 public Void run() {
  55                     values[0] = Boolean.getBoolean("java.lang.invoke.MethodHandle.DEBUG_NAMES");
  56                     values[1] = Boolean.getBoolean("java.lang.invoke.MethodHandle.DUMP_CLASS_FILES");
  57                     values[2] = Boolean.getBoolean("java.lang.invoke.MethodHandle.TRACE_INTERPRETER");
  58                     values[3] = Boolean.getBoolean("java.lang.invoke.MethodHandle.TRACE_METHOD_LINKAGE");
  59                     values[4] = Integer.getInteger("java.lang.invoke.MethodHandle.COMPILE_THRESHOLD");
  60                     values[5] = Integer.getInteger("java.lang.invoke.MethodHandle.PROFILE_LEVEL", 0);
  61 
  62                     return null;
  63                 }
  64             });
  65         DEBUG_METHOD_HANDLE_NAMES = (Boolean) values[0];
  66         DUMP_CLASS_FILES          = (Boolean) values[1];
  67         TRACE_INTERPRETER         = (Boolean) values[2];
  68         TRACE_METHOD_LINKAGE      = (Boolean) values[3];
  69         COMPILE_THRESHOLD         = (Integer) values[4];
  70         PROFILE_LEVEL             = (Integer) values[5];
  71     }
  72 
  73     /** Tell if any of the debugging switches are turned on.
  74      *  If this is the case, it is reasonable to perform extra checks or save extra information.
  75      */
  76     /*non-public*/ static boolean debugEnabled() {
  77         return (DEBUG_METHOD_HANDLE_NAMES |
  78                 DUMP_CLASS_FILES |
  79                 TRACE_INTERPRETER |
  80                 TRACE_METHOD_LINKAGE);
  81     }
  82 
  83     /*non-public*/ static String getNameString(MethodHandle target, MethodType type) {
  84         if (type == null)
  85             type = target.type();
  86         MemberName name = null;
  87         if (target != null)
  88             name = target.internalMemberName();
  89         if (name == null)
  90             return "invoke" + type;