/*

 * 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.code;

import java.io.*;

import java.util.*;

import sun.jvm.hotspot.asm.x86.*;

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 instructionsOffsetField;

  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");

    instructionsOffsetField  = type.getCIntegerField("_instructions_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; }

  // 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; }

  // 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 instructionsBegin() {

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

  }

  public Address instructionsEnd() {

    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 getInstructionsOffset() { return (int) instructionsOffsetField.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 getInstructionsSize() { return (int) instructionsEnd().minus(instructionsBegin()); }

  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 instructionsContains(Address addr) { return instructionsBegin().lessThanOrEqual(addr) && instructionsEnd().greaterThan(addr); }

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

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

  public boolean isFrameCompleteAt(Address a)       { return instructionsContains(a) && a.minus(instructionsBegin()) >= 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 */

  public OopMapSet getOopMaps() {

    Address oopMapsAddr = oopMapsField.getValue(addr);

    if (oopMapsAddr == null) {

      return null;

    }

    return new OopMapSet(oopMapsAddr);

  }

  // FIXME: not yet implementable

  //  void set_oop_maps(OopMapSet* p);

  public OopMap getOopMapForReturnAddress(Address returnAddress, boolean debugging) {

    Address pc = returnAddress;

    if (Assert.ASSERTS_ENABLED) {

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

    }

    return getOopMaps().findMapAtOffset(pc.minus(instructionsBegin()), 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(JavaThread thread) { 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(" instructions: [" + instructionsBegin() + ", " + instructionsEnd() + "), " +

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

                " frame size: " + getFrameSize());

  }

}