1 /* 2 * Copyright 2000-2008 Sun Microsystems, Inc. All Rights Reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25 package sun.jvm.hotspot.debugger; 26 27 import java.io.Serializable; 28 29 /** Encapsulates machine-specific information that currently must be 30 exported up to the Java level. Implementations must be 31 serializable. */ 32 33 public interface MachineDescription extends Serializable { 34 /** Returns the size of an address in bytes. Currently needed to be 35 able to traverse arrays of pointers or oops. */ 36 public long getAddressSize(); 37 38 /** Returns the maximum value of the C integer type with the given 39 size in bytes and signedness. Throws IllegalArgumentException if 40 the size in bytes is not legal for a C type (or can not be 41 handled by this system). Note that the current implementation 42 does not currently handle unsigned 8-byte longs properly. */ 43 public long cIntegerTypeMaxValue(long sizeInBytes, boolean isUnsigned); 44 45 /** Returns the minimum value of the C integer type with the given 46 size in bytes and signedness. Throws IllegalArgumentException if 47 the size in bytes is not legal for a C type (or can not be 48 handled by this system). */ 49 public long cIntegerTypeMinValue(long sizeInBytes, boolean isUnsigned); 50 51 /** Indicates whether the CPU is big- or little-endian. This 52 information is typically only needed by the Debugger 53 implementation. */ 54 public boolean isBigEndian(); 55 56 /** Indicates whether the underlying machine supports the LP64 data 57 model (currently only SPARC/64). */ 58 public boolean isLP64(); 59 }