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comparison agent/src/share/classes/sun/jvm/hotspot/debugger/MachineDescription.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 2000-2001 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 size of an address in bytes. Currently needed to be
39 able to traverse arrays of pointers or oops. (FIXME: since we're
40 already reading the Java primitive types' sizes from the remote
41 VM, it would be nice to remove this routine, using a similar
42 mechanism to how the TypeDataBase deals with primitive types.) */
43 public long getOopSize();
44
45 /** Returns the maximum 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). Note that the current implementation
49 does not currently handle unsigned 8-byte longs properly. */
50 public long cIntegerTypeMaxValue(long sizeInBytes, boolean isUnsigned);
51
52 /** Returns the minimum value of the C integer type with the given
53 size in bytes and signedness. Throws IllegalArgumentException if
54 the size in bytes is not legal for a C type (or can not be
55 handled by this system). */
56 public long cIntegerTypeMinValue(long sizeInBytes, boolean isUnsigned);
57
58 /** Indicates whether the CPU is big- or little-endian. This
59 information is typically only needed by the Debugger
60 implementation. */
61 public boolean isBigEndian();
62
63 /** Indicates whether the underlying machine supports the LP64 data
64 model (currently only SPARC/64). */
65 public boolean isLP64();
66 }