1 /* |
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2 * Copyright (c) 2011, 2012, 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. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package com.sun.tools.classfile; |
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27 |
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28 import java.io.IOException; |
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29 |
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30 /** |
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31 * See JVMS 4.7.21 |
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32 * http://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html#jvms-4.7.21 |
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33 * |
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34 * <p><b>This is NOT part of any supported API. |
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35 * If you write code that depends on this, you do so at your own risk. |
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36 * This code and its internal interfaces are subject to change or |
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37 * deletion without notice.</b> |
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38 */ |
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39 public class BootstrapMethods_attribute extends Attribute { |
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40 public final BootstrapMethodSpecifier[] bootstrap_method_specifiers; |
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41 |
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42 BootstrapMethods_attribute(ClassReader cr, int name_index, int length) |
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43 throws IOException, AttributeException { |
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44 super(name_index, length); |
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45 int bootstrap_method_count = cr.readUnsignedShort(); |
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46 bootstrap_method_specifiers = new BootstrapMethodSpecifier[bootstrap_method_count]; |
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47 for (int i = 0; i < bootstrap_method_specifiers.length; i++) |
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48 bootstrap_method_specifiers[i] = new BootstrapMethodSpecifier(cr); |
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49 } |
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50 |
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51 public BootstrapMethods_attribute(int name_index, BootstrapMethodSpecifier[] bootstrap_method_specifiers) { |
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52 super(name_index, length(bootstrap_method_specifiers)); |
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53 this.bootstrap_method_specifiers = bootstrap_method_specifiers; |
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54 } |
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55 |
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56 public static int length(BootstrapMethodSpecifier[] bootstrap_method_specifiers) { |
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57 int n = 2; |
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58 for (BootstrapMethodSpecifier b : bootstrap_method_specifiers) |
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59 n += b.length(); |
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60 return n; |
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61 } |
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62 |
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63 @Override |
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64 public <R, P> R accept(Visitor<R, P> visitor, P p) { |
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65 return visitor.visitBootstrapMethods(this, p); |
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66 } |
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67 |
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68 public static class BootstrapMethodSpecifier { |
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69 public int bootstrap_method_ref; |
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70 public int[] bootstrap_arguments; |
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71 |
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72 public BootstrapMethodSpecifier(int bootstrap_method_ref, int[] bootstrap_arguments) { |
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73 this.bootstrap_method_ref = bootstrap_method_ref; |
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74 this.bootstrap_arguments = bootstrap_arguments; |
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75 } |
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76 BootstrapMethodSpecifier(ClassReader cr) throws IOException { |
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77 bootstrap_method_ref = cr.readUnsignedShort(); |
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78 int method_count = cr.readUnsignedShort(); |
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79 bootstrap_arguments = new int[method_count]; |
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80 for (int i = 0; i < bootstrap_arguments.length; i++) { |
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81 bootstrap_arguments[i] = cr.readUnsignedShort(); |
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82 } |
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83 } |
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84 |
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85 int length() { |
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86 // u2 (method_ref) + u2 (argc) + u2 * argc |
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87 return 2 + 2 + (bootstrap_arguments.length * 2); |
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88 } |
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89 } |
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90 } |
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