hotspot/agent/src/share/classes/sun/jvm/hotspot/debugger/MachineDescription.java

/*
 * Copyright 2000-2001 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
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package sun.jvm.hotspot.debugger;

import java.io.Serializable;

/** Encapsulates machine-specific information that currently must be
    exported up to the Java level. Implementations must be
    serializable. */

public interface MachineDescription extends Serializable {
  /** Returns the size of an address in bytes. Currently needed to be
      able to traverse arrays of pointers or oops. */
  public long getAddressSize();

  /** Returns the size of an address in bytes. Currently needed to be
      able to traverse arrays of pointers or oops. (FIXME: since we're
      already reading the Java primitive types' sizes from the remote
      VM, it would be nice to remove this routine, using a similar
      mechanism to how the TypeDataBase deals with primitive types.) */
  public long getOopSize();

  /** Returns the maximum value of the C integer type with the given
      size in bytes and signedness. Throws IllegalArgumentException if
      the size in bytes is not legal for a C type (or can not be
      handled by this system). Note that the current implementation
      does not currently handle unsigned 8-byte longs properly. */
  public long cIntegerTypeMaxValue(long sizeInBytes, boolean isUnsigned);

  /** Returns the minimum value of the C integer type with the given
      size in bytes and signedness. Throws IllegalArgumentException if
      the size in bytes is not legal for a C type (or can not be
      handled by this system). */
  public long cIntegerTypeMinValue(long sizeInBytes, boolean isUnsigned);

  /** Indicates whether the CPU is big- or little-endian. This
      information is typically only needed by the Debugger
      implementation. */
  public boolean isBigEndian();

  /** Indicates whether the underlying machine supports the LP64 data
      model (currently only SPARC/64). */
  public boolean isLP64();
}