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1 /*
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2 * Copyright 2000-2001 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.debugger;
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26
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27 import java.io.Serializable;
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28
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29 /** Encapsulates machine-specific information that currently must be
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30 exported up to the Java level. Implementations must be
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31 serializable. */
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32
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33 public interface MachineDescription extends Serializable {
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34 /** Returns the size of an address in bytes. Currently needed to be
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35 able to traverse arrays of pointers or oops. */
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36 public long getAddressSize();
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37
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38 /** Returns the size of an address in bytes. Currently needed to be
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39 able to traverse arrays of pointers or oops. (FIXME: since we're
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40 already reading the Java primitive types' sizes from the remote
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41 VM, it would be nice to remove this routine, using a similar
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42 mechanism to how the TypeDataBase deals with primitive types.) */
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43 public long getOopSize();
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44
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45 /** Returns the maximum value of the C integer type with the given
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46 size in bytes and signedness. Throws IllegalArgumentException if
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47 the size in bytes is not legal for a C type (or can not be
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48 handled by this system). Note that the current implementation
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49 does not currently handle unsigned 8-byte longs properly. */
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50 public long cIntegerTypeMaxValue(long sizeInBytes, boolean isUnsigned);
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51
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52 /** Returns the minimum value of the C integer type with the given
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53 size in bytes and signedness. Throws IllegalArgumentException if
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54 the size in bytes is not legal for a C type (or can not be
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55 handled by this system). */
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56 public long cIntegerTypeMinValue(long sizeInBytes, boolean isUnsigned);
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57
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58 /** Indicates whether the CPU is big- or little-endian. This
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59 information is typically only needed by the Debugger
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60 implementation. */
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61 public boolean isBigEndian();
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62
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63 /** Indicates whether the underlying machine supports the LP64 data
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64 model (currently only SPARC/64). */
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65 public boolean isLP64();
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66 }
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