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annotate graal/com.oracle.max.asmdis/src/com/sun/max/asm/AlignmentPadding.java @ 4150:c78bace5086a

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start work on integrating old hooks into mx, work on sanity checks introduce a DB class to access the bench DB in an easier way (create benchmarks and benchmark values automatically in the DB)
author Gilles Duboscq <gilles.m.duboscq@gmail.com>
date Tue, 20 Dec 2011 15:34:43 +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 * 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 }