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1 /***
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2 * ASM: a very small and fast Java bytecode manipulation framework
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3 * Copyright (c) 2000-2005 INRIA, France Telecom
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4 * All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions
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8 * are met:
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 * 2. Redistributions in binary form must reproduce the above copyright
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12 * notice, this list of conditions and the following disclaimer in the
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13 * documentation and/or other materials provided with the distribution.
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14 * 3. Neither the name of the copyright holders nor the names of its
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15 * contributors may be used to endorse or promote products derived from
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16 * this software without specific prior written permission.
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17 *
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18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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28 * THE POSSIBILITY OF SUCH DAMAGE.
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29 */
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30 package clojure.asm.commons;
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31
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32 import clojure.asm.ClassAdapter;
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33 import clojure.asm.ClassVisitor;
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34 import clojure.asm.MethodVisitor;
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35 import clojure.asm.Opcodes;
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36
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37 /**
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38 * A {@link ClassAdapter} that merges clinit methods into a single one.
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39 *
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40 * @author Eric Bruneton
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41 */
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42 public class StaticInitMerger extends ClassAdapter{
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43
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44 private String name;
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45
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46 private MethodVisitor clinit;
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47
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48 private String prefix;
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49
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50 private int counter;
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51
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52 public StaticInitMerger(final String prefix, final ClassVisitor cv){
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53 super(cv);
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54 this.prefix = prefix;
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55 }
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56
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57 public void visit(
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58 final int version,
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59 final int access,
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60 final String name,
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61 final String signature,
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62 final String superName,
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63 final String[] interfaces){
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64 cv.visit(version, access, name, signature, superName, interfaces);
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65 this.name = name;
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66 }
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67
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68 public MethodVisitor visitMethod(
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69 final int access,
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70 final String name,
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71 final String desc,
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72 final String signature,
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73 final String[] exceptions){
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74 MethodVisitor mv;
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75 if(name.equals("<clinit>"))
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76 {
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77 int a = Opcodes.ACC_PRIVATE + Opcodes.ACC_STATIC;
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78 String n = prefix + counter++;
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79 mv = cv.visitMethod(a, n, desc, signature, exceptions);
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80
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81 if(clinit == null)
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82 {
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83 clinit = cv.visitMethod(a, name, desc, null, null);
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84 }
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85 clinit.visitMethodInsn(Opcodes.INVOKESTATIC, this.name, n, desc);
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86 }
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87 else
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88 {
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89 mv = cv.visitMethod(access, name, desc, signature, exceptions);
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90 }
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91 return mv;
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92 }
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93
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94 public void visitEnd(){
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95 if(clinit != null)
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96 {
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97 clinit.visitInsn(Opcodes.RETURN);
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98 clinit.visitMaxs(0, 0);
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99 }
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100 cv.visitEnd();
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101 }
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102 }
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