Mercurial > hg > truffle
annotate graal/com.oracle.max.asmdis/src/com/sun/max/asm/AlignmentPadding.java @ 3733:e233f5660da4
Added Java files from Maxine project.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 19:59:18 +0100 |
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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 * Byte stream padding for memory alignment in the assembler. This pseudo-instruction pads the byte stream to ensure that the next |
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27 * memory location is aligned on the specified boundary. |
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28 * Padding may also be performed conditionally to the amount of space left in the byte stream before the next aligned boundary. |
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29 */ |
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30 public abstract class AlignmentPadding extends MutableAssembledObject { |
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31 |
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32 public AlignmentPadding(Assembler assembler, int startPosition, int endPosition, int alignment, int alignmentStart, int requiredSpace, byte padByte) { |
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33 super(assembler, startPosition, endPosition); |
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34 this.alignment = alignment; |
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35 this.padByte = padByte; |
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36 this.alignmentStart = alignmentStart; |
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37 this.maxMisalignment = alignment - requiredSpace; |
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38 assembler.addAlignmentPadding(this); |
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39 } |
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40 |
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41 private final int alignment; |
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42 |
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43 public final int alignment() { |
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44 return alignment; |
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45 } |
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46 |
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47 /** |
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48 * Max misalignment supported. If greater than that, pad to the next alignment. |
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49 * By default, this is zero, meaning that padding is always performed to the next alignment. |
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50 * When we want to pad only if there isn't enough space to fit the next object of size s, maxMisalignment is |
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51 * set to alignment - s. |
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52 */ |
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53 private final int maxMisalignment; |
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54 |
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55 private final int alignmentStart; |
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56 |
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57 private final byte padByte; |
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58 |
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59 public void updatePadding() { |
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60 // We avoid sign problems with '%' below by masking off the sign bit: |
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61 final long unsignedAddend = (assembler().baseAddress() + startPosition()) & 0x7fffffffffffffffL; |
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62 final int misalignmentSize = (int) (unsignedAddend % alignment); |
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63 variableSize = (misalignmentSize <= maxMisalignment) ? 0 : alignment - misalignmentSize; |
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64 } |
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65 |
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66 @Override |
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67 protected void assemble() throws AssemblyException { |
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68 for (int i = alignmentStart; i < size(); i++) { |
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69 assembler().emitByte(padByte); |
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70 } |
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71 } |
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72 } |