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annotate jvmci/jdk.vm.ci.meta/src/jdk/vm/ci/meta/LocalVariableTable.java @ 24225:a2dbb6fcc923

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Added tag jvmci-0.33 for changeset 3aed4cb813f4
author Doug Simon <doug.simon@oracle.com>
date Fri, 18 Aug 2017 22:47:33 +0200
parents 9bc5db6cdbb0
children
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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
8bbbde9d0a52 extended ResolvedJavaMethod API by getLocalVariableTable
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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
8bbbde9d0a52 extended ResolvedJavaMethod API by getLocalVariableTable
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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 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[] getLocals() {
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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 }