Mercurial > hg > truffle
annotate graal/com.oracle.max.asmdis/src/com/sun/max/asm/InlineDataDecoder.java @ 4213:e4cfa571d8c4
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author | Christian Wimmer <Christian.Wimmer@Oracle.com> |
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date | Tue, 03 Jan 2012 18:47:27 -0800 |
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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 import java.io.*; |
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26 import java.util.*; |
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27 |
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28 import com.sun.max.asm.InlineDataDescriptor.*; |
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29 import com.sun.max.io.*; |
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30 import com.sun.max.program.*; |
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31 |
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32 /** |
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33 * A decoder for a sequence of {@linkplain InlineDataDescriptor inline data descriptors} associated with an |
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34 * instruction stream. The decoder is initialized either from an encoded or inflated sequence of descriptors. |
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35 * |
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36 * Once initialized, a inline data decoder can be {@linkplain #decode(int, BufferedInputStream) queried} for the |
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37 * inline data descriptor describing the inline data at a given position in an instruction stream. |
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38 */ |
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39 public class InlineDataDecoder { |
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40 |
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41 protected final Map<Integer, InlineDataDescriptor> positionToDescriptorMap; |
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42 |
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43 /** |
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44 * Creates a decoder from an encoded sequence of inline data descriptors. |
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45 * |
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46 * @param encodedDescriptors a sequence of descriptors encoded in a byte array whose format complies with that used |
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47 * by {@link InlineDataRecorder#encodedDescriptors()}. This value can be null. |
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48 * @return null if {@code encodedDescriptors} is null |
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49 */ |
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50 public static InlineDataDecoder createFrom(byte[] encodedDescriptors) { |
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51 if (encodedDescriptors != null) { |
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52 return new InlineDataDecoder(encodedDescriptors); |
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53 } |
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54 return null; |
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55 } |
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56 |
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57 /** |
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58 * Creates a decoder based on the descriptors in a given recorder. |
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59 * |
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60 * @param inlineDataRecorder |
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61 * @return null if {@code inlineDataRecorder} does not contain any entries |
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62 */ |
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63 public static InlineDataDecoder createFrom(InlineDataRecorder inlineDataRecorder) { |
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64 final List<InlineDataDescriptor> descriptors = inlineDataRecorder.descriptors(); |
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65 if (descriptors != null) { |
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66 return new InlineDataDecoder(descriptors); |
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67 } |
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68 return null; |
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69 } |
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70 |
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71 public InlineDataDecoder(List<InlineDataDescriptor> descriptors) { |
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72 positionToDescriptorMap = new TreeMap<>(); |
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73 for (InlineDataDescriptor descriptor : descriptors) { |
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74 positionToDescriptorMap.put(descriptor.startPosition(), descriptor); |
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75 } |
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76 } |
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77 |
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78 /** |
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79 * Creates a decoder from an encoded sequence of inline data descriptors. |
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80 * |
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81 * @param encodedDescriptors a sequence of descriptors encoded in a byte array whose format complies with that used |
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82 * by {@link InlineDataRecorder#encodedDescriptors()} |
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83 */ |
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84 public InlineDataDecoder(byte[] encodedDescriptors) { |
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85 try { |
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86 final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(encodedDescriptors); |
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87 final DataInputStream dataInputStream = new DataInputStream(byteArrayInputStream); |
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88 final int numberOfEntries = dataInputStream.readInt(); |
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89 positionToDescriptorMap = new TreeMap<>(); |
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90 for (int i = 0; i < numberOfEntries; ++i) { |
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91 final Tag tag = InlineDataDescriptor.Tag.VALUES.get(dataInputStream.readByte()); |
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92 final InlineDataDescriptor inlineDataDescriptor = tag.decode(dataInputStream); |
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93 positionToDescriptorMap.put(inlineDataDescriptor.startPosition(), inlineDataDescriptor); |
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94 } |
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95 assert byteArrayInputStream.available() == 0; |
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96 } catch (IOException ioException) { |
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97 throw ProgramError.unexpected(ioException); |
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98 } |
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99 } |
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100 |
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101 /** |
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102 * Decodes the data (if any) from the current read position of a given stream. |
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103 * |
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104 * @param currentPosition the stream's current read position with respect to the start of the stream |
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105 * @param stream the instruction stream being disassembled |
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106 * @return the inline data decoded from the stream or null if there is no inline data at {@code currentPosition} |
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107 */ |
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108 public InlineData decode(int currentPosition, BufferedInputStream stream) throws IOException { |
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109 final InlineDataDescriptor inlineDataDescriptor = positionToDescriptorMap.get(currentPosition); |
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110 if (inlineDataDescriptor != null) { |
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111 final int size = inlineDataDescriptor.size(); |
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112 final byte[] data = new byte[size]; |
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113 Streams.readFully(stream, data); |
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114 return new InlineData(inlineDataDescriptor, data); |
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115 } |
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116 return null; |
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117 } |
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118 } |