Mercurial > hg > truffle
annotate graal/com.oracle.max.asmdis/src/com/sun/max/asm/OffsetLiteral.java @ 4178:d1b26c17910a
Add the Dacapo benchmarks to the "lib" folder instead of using the environment variable. Fixed an issue in the downloader.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Mon, 02 Jan 2012 21:52:23 +0100 |
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rev | line source |
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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 } |