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annotate graal/com.oracle.max.asmdis/src/com/sun/max/asm/OffsetLiteral.java @ 4138:82af018d61db

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Merge fixes.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sat, 17 Dec 2011 22:03:44 +0100
parents e233f5660da4
children
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1 /*
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2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.sun.max.asm;
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24
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25 /**
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26 * Represents an offset between two positions (represented by given labels) in the assembled code.
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27 */
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28 public class OffsetLiteral extends MutableAssembledObject {
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29
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30 /**
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31 * Creates an offset between two positions (represented by given labels) in the assembled code.
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32 *
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33 * @param base the label whose position marks the base of the offset
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34 * @param target the label whose position marks the target of the offset
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35 */
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36 protected OffsetLiteral(Assembler assembler, int startPosition, int endPosition, Label target, Label base) {
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37 super(assembler, startPosition, endPosition);
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38 assembler.addFixedSizeAssembledObject(this);
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39 this.target = target;
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40 this.base = base;
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41 }
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42
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43 private final Label target;
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44 private final Label base;
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45
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46 @Override
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47 protected final void assemble() throws AssemblyException {
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48 final Assembler assembler = assembler();
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49 final long offset = offset();
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50 // select the correct assembler function to emit the offset.
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51 // The assembler knows the endianness to use
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52 switch(size()) {
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53 case 1:
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54 assembler.emitByte((byte) (offset & 0xFF));
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55 break;
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56 case 2:
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57 assembler.emitShort((short) (offset & 0xFFFF));
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58 break;
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59 case 4:
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60 assembler.emitInt((int) (offset & 0xFFFFFFFF));
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61 break;
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62 case 8:
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63 assembler.emitLong(offset);
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64 break;
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65 default:
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66 throw new AssemblyException("Invalid size for offset literal");
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67 }
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68 }
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69
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70 public final long offset() throws AssemblyException {
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71 return target.position() - base.position();
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72 }
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73
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74 public final boolean isCode() {
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75 return false;
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76 }
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77 }