Mercurial > hg > graal-jvmci-8
annotate jvmci/jdk.vm.ci.meta/src/jdk/vm/ci/meta/LocalVariableTable.java @ 23718:0bd91cd9869d
need to be able to copy internal arrays from LocalVariableTable and LineNumberTable (JDK-8160647)
author | Doug Simon <doug.simon@oracle.com> |
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date | Thu, 30 Jun 2016 22:08:57 +0200 |
parents | 9e1235406b59 |
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extended ResolvedJavaMethod API by getLocalVariableTable
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1 /* |
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2 * Copyright (c) 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 |
8bbbde9d0a52
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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 jdk.vm.ci.meta; |
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24 |
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25 import java.util.ArrayList; |
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26 import java.util.List; |
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27 |
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28 /** |
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29 * Describes the {@link Local}s for a Java method. |
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30 * |
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31 * @see "https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html#jvms-4.7.13" |
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32 */ |
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33 public class LocalVariableTable { |
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34 |
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35 private final Local[] locals; |
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36 |
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37 /** |
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38 * Creates an object describing the {@link Local}s for a Java method. |
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39 * |
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40 * @param locals array of objects describing local variables. This array is now owned by this |
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41 * object and must not be mutated by the caller. |
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42 */ |
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43 @SuppressFBWarnings(value = "EI_EXPOSE_REP2", justification = "caller transfers ownership of `locals`") |
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44 public LocalVariableTable(Local[] locals) { |
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45 this.locals = locals; |
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46 } |
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47 |
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48 /** |
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49 * Gets a description of a local variable that occupies the bytecode frame slot indexed by |
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50 * {@code slot} and is live at the bytecode index {@code bci} |
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51 * |
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52 * @return a description of the requested local variable or null if no such variable matches |
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53 * {@code slot} and {@code bci} |
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54 */ |
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55 public Local getLocal(int slot, int bci) { |
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56 Local result = null; |
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57 for (Local local : locals) { |
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58 if (local.getSlot() == slot && local.getStartBCI() <= bci && local.getEndBCI() >= bci) { |
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59 if (result == null) { |
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60 result = local; |
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61 } else { |
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62 throw new IllegalStateException("Locals overlap!"); |
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63 } |
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64 } |
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65 } |
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66 return result; |
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67 } |
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68 |
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69 /** |
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70 * Gets a copy of the array of {@link Local}s that was passed to this object's constructor. |
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71 */ |
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72 public Local[] getLocalsCopy() { |
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73 return locals.clone(); |
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74 } |
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75 |
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76 /** |
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77 * Gets a description of all the local variables live at the bytecode index {@code bci} |
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78 */ |
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79 public Local[] getLocalsAt(int bci) { |
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80 List<Local> result = new ArrayList<>(); |
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81 for (Local l : locals) { |
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82 if (l.getStartBCI() <= bci && bci <= l.getEndBCI()) { |
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83 result.add(l); |
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84 } |
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85 } |
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86 return result.toArray(new Local[result.size()]); |
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87 } |
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88 } |