/*

 * 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.runtime;

import java.util.*;

import sun.jvm.hotspot.debugger.*;

import sun.jvm.hotspot.interpreter.*;

import sun.jvm.hotspot.oops.*;

import sun.jvm.hotspot.utilities.*;

public class InterpretedVFrame extends JavaVFrame {

  /** JVM state */

  public Method getMethod() {

    return getFrame().getInterpreterFrameMethod();

  }

  public StackValueCollection getLocals() {

    Method m = getMethod();

    int length = (int) m.getMaxLocals();

    if (m.isNative()) {

      // If the method is native, getMaxLocals is not telling the truth.

      // maxlocals then equals the size of parameters

      length = (int) m.getSizeOfParameters();

    }

    StackValueCollection result = new StackValueCollection(length);

    // Get oopmap describing oops and int for current bci

    OopMapCacheEntry oopMask = getMethod().getMaskFor(getBCI());

    // handle locals

    for(int i = 0; i < length; i++) {

      // Find stack location

      Address addr = addressOfLocalAt(i);

      // Depending on oop/int put it in the right package

      StackValue sv;

      if (oopMask.isOop(i)) {

        // oop value

        sv = new StackValue(addr.getOopHandleAt(0), 0);

      } else {

        // integer

        // Fetch a signed integer the size of a stack slot

        sv = new StackValue(addr.getCIntegerAt(0, VM.getVM().getAddressSize(), false));

      }

      result.add(sv);

    }

    return result;

  }

  public StackValueCollection getExpressions() {

    int length = getFrame().getInterpreterFrameExpressionStackSize();

    if (getMethod().isNative()) {

      // If the method is native, there is no expression stack

      length = 0;

    }

    int nofLocals = (int) getMethod().getMaxLocals();

    StackValueCollection result = new StackValueCollection(length);

    // Get oopmap describing oops and int for current bci

    OopMapCacheEntry oopMask = getMethod().getMaskFor(getBCI());

    for(int i = 0; i < length; i++) {

      // Find stack location

      Address addr = addressOfExpressionStackAt(i);

      // Depending on oop/int put it in the right package

      StackValue sv;

      if (oopMask.isOop(i + nofLocals)) {

        // oop value

        sv = new StackValue(addr.getOopHandleAt(0), 0);

      } else {

        // integer

        // Fetch a signed integer the size of a stack slot

        sv = new StackValue(addr.getCIntegerAt(0, VM.getVM().getAddressSize(), false));

      }

      result.add(sv);

    }

    return result;

  }

  /** Returns List<MonitorInfo> */

  public List   getMonitors() {

    List result = new ArrayList(5);

    for (BasicObjectLock current = getFrame().interpreterFrameMonitorEnd();

         current.address().lessThan(getFrame().interpreterFrameMonitorBegin().address());

         current = getFrame().nextMonitorInInterpreterFrame(current)) {

      result.add(new MonitorInfo(current.obj(), current.lock(), false, false));

    }

    return result;

  }

  /** Test operation */

  public boolean isInterpretedFrame() { return true; }

  /** Package-internal constructor */

  InterpretedVFrame(Frame fr, RegisterMap regMap, JavaThread thread) {

    super(fr, regMap, thread);

  }

  /** Accessor for Byte Code Index (NOTE: access to BCP is not allowed

      in this system; see Frame.java) */

  public int getBCI() {

    return getFrame().getInterpreterFrameBCI();

  }

  /** Setter for Byte Code Index */

  // FIXME: not yet implementable

  //  public void setBCI(int bci) {

  //    getFrame().setInterpreterFrameBCI(bci);

  //  }

  public void verify() {

  }

  //--------------------------------------------------------------------------------

  // Internals only below this point

  //

  private Address addressOfLocalAt(int index) {

    if (Assert.ASSERTS_ENABLED) {

      Assert.that(getFrame().isInterpretedFrame(), "frame should be an interpreted frame");

    }

    return fr.addressOfInterpreterFrameLocal(index);

  }

  private Address addressOfExpressionStackAt(int index) {

    return fr.addressOfInterpreterFrameExpressionStackSlot(index);

  }

}