/*

 * Copyright (c) 2000, 2012, 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.io.*;

import java.util.*;

import sun.jvm.hotspot.compiler.*;

import sun.jvm.hotspot.debugger.*;

import sun.jvm.hotspot.runtime.*;

import sun.jvm.hotspot.types.*;

import sun.jvm.hotspot.utilities.*;

public class CodeBlob extends VMObject {

  private static AddressField  nameField;

  private static CIntegerField sizeField;

  private static CIntegerField headerSizeField;

  private static CIntegerField relocationSizeField;

  private static CIntegerField contentOffsetField;

  private static CIntegerField codeOffsetField;

  private static CIntegerField frameCompleteOffsetField;

  private static CIntegerField dataOffsetField;

  private static CIntegerField frameSizeField;

  private static AddressField  oopMapsField;

  // Only used by server compiler on x86; computed over in SA rather

  // than relying on computation in target VM

  private static final int     NOT_YET_COMPUTED = -2;

  private static final int     UNDEFINED        = -1;

  private              int     linkOffset       = NOT_YET_COMPUTED;

  private static       int     matcherInterpreterFramePointerReg;

  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("CodeBlob");

    nameField                = type.getAddressField("_name");

    sizeField                = type.getCIntegerField("_size");

    headerSizeField          = type.getCIntegerField("_header_size");

    relocationSizeField      = type.getCIntegerField("_relocation_size");

    frameCompleteOffsetField = type.getCIntegerField("_frame_complete_offset");

    contentOffsetField       = type.getCIntegerField("_content_offset");

    codeOffsetField          = type.getCIntegerField("_code_offset");

    dataOffsetField          = type.getCIntegerField("_data_offset");

    frameSizeField           = type.getCIntegerField("_frame_size");

    oopMapsField             = type.getAddressField("_oop_maps");

    if (VM.getVM().isServerCompiler()) {

      matcherInterpreterFramePointerReg =

        db.lookupIntConstant("Matcher::interpreter_frame_pointer_reg").intValue();

    }

  }

  public CodeBlob(Address addr) {

    super(addr);

  }

  // Typing

  public boolean isBufferBlob()         { return false; }

  public boolean isNMethod()            { return false; }

  public boolean isRuntimeStub()        { return false; }

  public boolean isDeoptimizationStub() { return false; }

  public boolean isUncommonTrapStub()   { return false; }

  public boolean isExceptionStub()      { return false; }

  public boolean isSafepointStub()      { return false; }

  public boolean isAdapterBlob()        { return false; }

  // Fine grain nmethod support: isNmethod() == isJavaMethod() || isNativeMethod() || isOSRMethod()

  public boolean isJavaMethod()         { return false; }

  public boolean isNativeMethod()       { return false; }

  /** On-Stack Replacement method */

  public boolean isOSRMethod()          { return false; }

  public NMethod asNMethodOrNull() {

    if (isNMethod()) return (NMethod)this;

    return null;

  }

  // Boundaries

  public Address headerBegin() {

    return addr;

  }

  public Address headerEnd() {

    return addr.addOffsetTo(headerSizeField.getValue(addr));

  }

  // FIXME: add RelocInfo

  //  public RelocInfo relocationBegin();

  //  public RelocInfo relocationEnd();

  public Address contentBegin() {

    return headerBegin().addOffsetTo(contentOffsetField.getValue(addr));

  }

  public Address contentEnd() {

    return headerBegin().addOffsetTo(dataOffsetField.getValue(addr));

  }

  public Address codeBegin() {

    return headerBegin().addOffsetTo(contentOffsetField.getValue(addr));

  }

  public Address codeEnd() {

    return headerBegin().addOffsetTo(dataOffsetField.getValue(addr));

  }

  public Address dataBegin() {

    return headerBegin().addOffsetTo(dataOffsetField.getValue(addr));

  }

  public Address dataEnd() {

    return headerBegin().addOffsetTo(sizeField.getValue(addr));

  }

  // Offsets

  public int getRelocationOffset() { return (int) headerSizeField   .getValue(addr); }

  public int getContentOffset()    { return (int) contentOffsetField.getValue(addr); }

  public int getCodeOffset()       { return (int) codeOffsetField   .getValue(addr); }

  public int getDataOffset()       { return (int) dataOffsetField   .getValue(addr); }

  // Sizes

  public int getSize()             { return (int) sizeField      .getValue(addr);     }

  public int getHeaderSize()       { return (int) headerSizeField.getValue(addr);     }

  // FIXME: add getRelocationSize()

  public int getContentSize()      { return (int) contentEnd().minus(contentBegin()); }

  public int getCodeSize()         { return (int) codeEnd()   .minus(codeBegin());    }

  public int getDataSize()         { return (int) dataEnd()   .minus(dataBegin());    }

  // Containment

  public boolean blobContains(Address addr)    { return headerBegin() .lessThanOrEqual(addr) && dataEnd()   .greaterThan(addr); }

  // FIXME: add relocationContains

  public boolean contentContains(Address addr) { return contentBegin().lessThanOrEqual(addr) && contentEnd().greaterThan(addr); }

  public boolean codeContains(Address addr)    { return codeBegin()   .lessThanOrEqual(addr) && codeEnd()   .greaterThan(addr); }

  public boolean dataContains(Address addr)    { return dataBegin()   .lessThanOrEqual(addr) && dataEnd()   .greaterThan(addr); }

  public boolean contains(Address addr)        { return contentContains(addr);                                                  }

  public boolean isFrameCompleteAt(Address a)  { return codeContains(a) && a.minus(codeBegin()) >= frameCompleteOffsetField.getValue(addr); }

  // Reclamation support (really only used by the nmethods, but in order to get asserts to work

  // in the CodeCache they are defined virtual here)

  public boolean isZombie()             { return false; }

  public boolean isLockedByVM()         { return false; }

  /** OopMap for frame; can return null if none available */

    Address oopMapsAddr = oopMapsField.getValue(addr);

    if (oopMapsAddr == null) {

      return null;

    }

  }

  // FIXME: not yet implementable

    Address pc = returnAddress;

    if (Assert.ASSERTS_ENABLED) {

      Assert.that(getOopMaps() != null, "nope");

    }

    return getOopMaps().findMapAtOffset(pc.minus(codeBegin()), debugging);

  }

  //  virtual void preserve_callee_argument_oops(frame fr, const RegisterMap* reg_map, void f(oop*)) { ShouldNotReachHere(); }

  //  FIXME;

  /** NOTE: this returns a size in BYTES in this system! */

  public long getFrameSize() {

    return VM.getVM().getAddressSize() * frameSizeField.getValue(addr);

  }

  // Returns true, if the next frame is responsible for GC'ing oops passed as arguments

  public boolean callerMustGCArguments() { return false; }

  public String getName() {

    return CStringUtilities.getString(nameField.getValue(addr));

  }

  // FIXME: NOT FINISHED

  // FIXME: add more accessors

  public void print() {

    printOn(System.out);

  }

  public void printOn(PrintStream tty) {

    tty.print(getName());

    printComponentsOn(tty);

  }

  protected void printComponentsOn(PrintStream tty) {

    tty.println(" content: [" + contentBegin() + ", " + contentEnd() + "), " +

                " code: [" + codeBegin() + ", " + codeEnd() + "), " +

                " data: [" + dataBegin() + ", " + dataEnd() + "), " +

                " frame size: " + getFrameSize());

  }

}