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annotate graal/com.oracle.max.asmdis/src/com/sun/max/asm/gen/risc/RiscFieldDisassembler.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 /**
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24 *
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25 */
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26 package com.sun.max.asm.gen.risc;
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27
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28 import com.sun.max.asm.gen.*;
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29 import com.sun.max.asm.gen.risc.bitRange.*;
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30 import com.sun.max.asm.gen.risc.field.*;
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31 import com.sun.max.lang.*;
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32
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33 /**
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34 * Disassembles an assembled RISC instruction to show the value of each field in the instruction as
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35 * well as the bits occupied by the field.
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36 */
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37 class RiscFieldDisassembler<Template_Type extends Template> implements RiscInstructionDescriptionVisitor {
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38
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39 private final Template_Type template;
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40 private final int assembledInstruction;
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41 private String string;
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42
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43 public RiscFieldDisassembler(Template_Type template, byte[] assembledInstruction) {
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44 assert assembledInstruction.length == 4;
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45 this.template = template;
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46 this.assembledInstruction = assembledInstruction[0] << 24 | ((assembledInstruction[1] & 0xFF) << 16) | ((assembledInstruction[2] & 0xFF) << 8) | (assembledInstruction[3] & 0xFF);
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47 }
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48
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49 @Override
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50 public String toString() {
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51 if (string == null) {
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52 string = "";
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53 RiscInstructionDescriptionVisitor.Static.visitInstructionDescription(this, template.instructionDescription());
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54 }
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55 return string;
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56 }
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57
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58 public void visitConstant(RiscConstant constant) {
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59 visitField(constant.field());
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60 }
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61
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62 public void visitConstraint(InstructionConstraint constraint) {
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63 }
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64
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65 public void visitField(RiscField field) {
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66 if (string.length() != 0) {
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67 string += ' ';
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68 }
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69 final int value;
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70 final BitRange bitRange = field.bitRange();
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71 final int width = bitRange.width();
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72
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73 if (field instanceof OperandField) {
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74 value = ((OperandField) field).extract(assembledInstruction);
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75 } else {
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76 value = bitRange.extractUnsignedInt(assembledInstruction);
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77 }
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78 String binary = Integer.toBinaryString(value);
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79 if (binary.length() > width) {
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80 binary = binary.substring(binary.length() - width);
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81 } else if (binary.length() < width) {
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82 binary = Strings.times('0', width - binary.length()) + binary;
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83 }
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84
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85 string += field.name() + "[" + bitRange + "]=" + value + "{" + binary + "}";
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86 }
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87
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88 public void visitString(String s) {
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89 }
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90
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91 }