JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package sun.jvm.hotspot.code;

import java.util.*;

import sun.jvm.hotspot.debugger.Address;
import sun.jvm.hotspot.oops.*;
import sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.types.*;
import sun.jvm.hotspot.utilities.*;

public abstract class CompiledMethod extends CodeBlob {
  private static AddressField  methodField;
  private static AddressField  deoptHandlerBeginField;
  private static AddressField  deoptMhHandlerBeginField;
  private static AddressField  scopesDataBeginField;

  static {
    VM.registerVMInitializedObserver(new Observer() {
        public void update(Observable o, Object data) {
          initialize(VM.getVM().getTypeDataBase());
        }
      });
  }

  private static void initialize(TypeDataBase db) {
    Type type = db.lookupType("CompiledMethod");

    methodField                 = type.getAddressField("_method");
    deoptHandlerBeginField      = type.getAddressField("_deopt_handler_begin");
    deoptMhHandlerBeginField    = type.getAddressField("_deopt_mh_handler_begin");
    scopesDataBeginField        = type.getAddressField("_scopes_data_begin");
  }

  public CompiledMethod(Address addr) {
    super(addr);
  }

  public Method getMethod() {
    return (Method)Metadata.instantiateWrapperFor(methodField.getValue(addr));
  }

  public Address deoptHandlerBegin()    { return deoptHandlerBeginField.getValue(addr);              }
  public Address deoptMhHandlerBegin()  { return deoptMhHandlerBeginField.getValue(addr);            }

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