/*

 * 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 *

 */

package sun.jvm.hotspot.memory;

import java.io.*;

import java.util.*;

import sun.jvm.hotspot.debugger.*;

import sun.jvm.hotspot.gc_interface.*;

import sun.jvm.hotspot.gc_implementation.parallelScavenge.*;

import sun.jvm.hotspot.oops.*;

import sun.jvm.hotspot.types.*;

import sun.jvm.hotspot.runtime.*;

public class Universe {

  private static AddressField collectedHeapField;

  private static VirtualConstructor heapConstructor;

  private static sun.jvm.hotspot.types.OopField mainThreadGroupField;

  private static sun.jvm.hotspot.types.OopField systemThreadGroupField;

  // single dimensional primitive array klasses

  private static sun.jvm.hotspot.types.OopField boolArrayKlassObjField;

  private static sun.jvm.hotspot.types.OopField byteArrayKlassObjField;

  private static sun.jvm.hotspot.types.OopField charArrayKlassObjField;

  private static sun.jvm.hotspot.types.OopField intArrayKlassObjField;

  private static sun.jvm.hotspot.types.OopField shortArrayKlassObjField;

  private static sun.jvm.hotspot.types.OopField longArrayKlassObjField;

  private static sun.jvm.hotspot.types.OopField singleArrayKlassObjField;

  private static sun.jvm.hotspot.types.OopField doubleArrayKlassObjField;

  // system obj array klass object

  private static sun.jvm.hotspot.types.OopField systemObjArrayKlassObjField;

  private static AddressField narrowOopBaseField;

  private static CIntegerField narrowOopShiftField;

  static {

    VM.registerVMInitializedObserver(new Observer() {

        public void update(Observable o, Object data) {

          initialize(VM.getVM().getTypeDataBase());

        }

      });

  }

  private static synchronized void initialize(TypeDataBase db) {

    Type type = db.lookupType("Universe");

    collectedHeapField = type.getAddressField("_collectedHeap");

    heapConstructor = new VirtualConstructor(db);

    heapConstructor.addMapping("GenCollectedHeap", GenCollectedHeap.class);

    heapConstructor.addMapping("ParallelScavengeHeap", ParallelScavengeHeap.class);

    mainThreadGroupField   = type.getOopField("_main_thread_group");

    systemThreadGroupField = type.getOopField("_system_thread_group");

    boolArrayKlassObjField = type.getOopField("_boolArrayKlassObj");

    byteArrayKlassObjField = type.getOopField("_byteArrayKlassObj");

    charArrayKlassObjField = type.getOopField("_charArrayKlassObj");

    intArrayKlassObjField = type.getOopField("_intArrayKlassObj");

    shortArrayKlassObjField = type.getOopField("_shortArrayKlassObj");

    longArrayKlassObjField = type.getOopField("_longArrayKlassObj");

    singleArrayKlassObjField = type.getOopField("_singleArrayKlassObj");

    doubleArrayKlassObjField = type.getOopField("_doubleArrayKlassObj");

    systemObjArrayKlassObjField = type.getOopField("_systemObjArrayKlassObj");

    narrowOopBaseField = type.getAddressField("_narrow_oop._base");

    narrowOopShiftField = type.getCIntegerField("_narrow_oop._shift");

  }

  public Universe() {

  }

  public CollectedHeap heap() {

    try {

      return (CollectedHeap) heapConstructor.instantiateWrapperFor(collectedHeapField.getValue());

    } catch (WrongTypeException e) {

      return new CollectedHeap(collectedHeapField.getValue());

    }

  }

  public static long getNarrowOopBase() {

    if (narrowOopBaseField.getValue() == null) {

      return 0;

    } else {

      return narrowOopBaseField.getValue().minus(null);

    }

  }

  public static int getNarrowOopShift() {

    return (int)narrowOopShiftField.getValue();

  }

  /** Returns "TRUE" iff "p" points into the allocated area of the heap. */

  public boolean isIn(Address p) {

    return heap().isIn(p);

  }

  /** Returns "TRUE" iff "p" points into the reserved area of the heap. */

  public boolean isInReserved(Address p) {

    return heap().isInReserved(p);

  }

  private Oop newOop(OopHandle handle) {

    return VM.getVM().getObjectHeap().newOop(handle);

  }

  public Oop mainThreadGroup() {

    return newOop(mainThreadGroupField.getValue());

  }

  public Oop systemThreadGroup() {

    return newOop(systemThreadGroupField.getValue());

  }

  public Oop systemObjArrayKlassObj() {

    return newOop(systemObjArrayKlassObjField.getValue());

  }

  // iterate through the single dimensional primitive array klasses

  // refer to basic_type_classes_do(void f(klassOop)) in universe.cpp

  public void basicTypeClassesDo(SystemDictionary.ClassVisitor visitor) {

    visitor.visit((Klass)newOop(boolArrayKlassObjField.getValue()));

    visitor.visit((Klass)newOop(byteArrayKlassObjField.getValue()));

    visitor.visit((Klass)newOop(charArrayKlassObjField.getValue()));

    visitor.visit((Klass)newOop(intArrayKlassObjField.getValue()));

    visitor.visit((Klass)newOop(shortArrayKlassObjField.getValue()));

    visitor.visit((Klass)newOop(longArrayKlassObjField.getValue()));

    visitor.visit((Klass)newOop(singleArrayKlassObjField.getValue()));

    visitor.visit((Klass)newOop(doubleArrayKlassObjField.getValue()));

  }

  public void print() { printOn(System.out); }

  public void printOn(PrintStream tty) {

    heap().printOn(tty);

  }

  // Check whether an element of a typeArrayOop with the given type must be

  // aligned 0 mod 8.  The typeArrayOop itself must be aligned at least this

  // strongly.

  public static boolean elementTypeShouldBeAligned(BasicType type) {

    return type == BasicType.T_DOUBLE || type == BasicType.T_LONG;

  }

  // Check whether an object field (static/non-static) of the given type must be

  // aligned 0 mod 8.

  public static boolean fieldTypeShouldBeAligned(BasicType type) {

    return type == BasicType.T_DOUBLE || type == BasicType.T_LONG;

  }

}