1 // ASM: a very small and fast Java bytecode manipulation framework 2 // Copyright (c) 2000-2011 INRIA, France Telecom 3 // All rights reserved. 4 // 5 // Redistribution and use in source and binary forms, with or without 6 // modification, are permitted provided that the following conditions 7 // are met: 8 // 1. Redistributions of source code must retain the above copyright 9 // notice, this list of conditions and the following disclaimer. 10 // 2. Redistributions in binary form must reproduce the above copyright 11 // notice, this list of conditions and the following disclaimer in the 12 // documentation and/or other materials provided with the distribution. 13 // 3. Neither the name of the copyright holders nor the names of its 14 // contributors may be used to endorse or promote products derived from 15 // this software without specific prior written permission. 16 // 17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 18 // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 // ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 21 // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 22 // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 25 // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 27 // THE POSSIBILITY OF SUCH DAMAGE. 28 package jdk8; 29 30 import java.io.FileOutputStream; 31 import java.io.IOException; 32 import org.objectweb.asm.ClassWriter; 33 import org.objectweb.asm.MethodVisitor; 34 import org.objectweb.asm.Label; 35 import org.objectweb.asm.Opcodes; 36 import org.objectweb.asm.Type; 37 38 /** 39 * Generates a class with structures, instructions and patterns that cannot be produced by compiling 40 * a Java source file with the javac compiler. This includes LDC instructions with MethodType 41 * constants. 42 * 43 * <p>Ideally we should not use ASM to generate this class (which is later used to test ASM), but 44 * this would be hard to do. 45 * 46 * @author Eric Bruneton 47 */ 48 public class DumpArtificialStructures implements Opcodes { 49 main(String[] args)50 public static void main(String[] args) throws IOException { 51 FileOutputStream fileOutputStream = new FileOutputStream("Artificial$()$Structures.class"); 52 fileOutputStream.write(dump()); 53 fileOutputStream.close(); 54 } 55 dump()56 private static byte[] dump() { 57 ClassWriter classWriter = new ClassWriter(ClassWriter.COMPUTE_FRAMES); 58 MethodVisitor methodVisitor; 59 60 final String INTERNAL_NAME = "jdk8/Artificial$()$Structures"; 61 classWriter.visit( 62 V1_8, 63 ACC_PUBLIC + ACC_SUPER, 64 INTERNAL_NAME, 65 null, 66 "java/lang/Object", 67 null); 68 69 classWriter.visitField(ACC_PUBLIC, "value", "I", null, null).visitEnd(); 70 71 methodVisitor = classWriter.visitMethod(ACC_PUBLIC, "<init>", "(I)V", null, null); 72 methodVisitor.visitCode(); 73 methodVisitor.visitVarInsn(ALOAD, 0); 74 methodVisitor.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false); 75 methodVisitor.visitVarInsn(ALOAD, 0); 76 methodVisitor.visitVarInsn(ILOAD, 1); 77 methodVisitor.visitFieldInsn(PUTFIELD, INTERNAL_NAME, "value", "I"); 78 methodVisitor.visitInsn(RETURN); 79 methodVisitor.visitMaxs(0, 0); 80 methodVisitor.visitEnd(); 81 82 methodVisitor = 83 classWriter.visitMethod( 84 ACC_PRIVATE, "<init>", "(Ljdk8/Artificial$()$Structures;)V", null, null); 85 methodVisitor.visitCode(); 86 methodVisitor.visitVarInsn(ALOAD, 0); 87 methodVisitor.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false); 88 methodVisitor.visitVarInsn(ALOAD, 0); 89 methodVisitor.visitVarInsn(ALOAD, 1); 90 Label elseLabel = new Label(); 91 methodVisitor.visitJumpInsn(IFNULL, elseLabel); 92 methodVisitor.visitVarInsn(ALOAD, 1); 93 methodVisitor.visitFieldInsn(GETFIELD, INTERNAL_NAME, "value", "I"); 94 Label endIfLabel = new Label(); 95 methodVisitor.visitJumpInsn(GOTO, endIfLabel); 96 methodVisitor.visitLabel(elseLabel); 97 methodVisitor.visitInsn(ICONST_0); 98 methodVisitor.visitLabel(endIfLabel); 99 methodVisitor.visitFieldInsn(PUTFIELD, INTERNAL_NAME, "value", "I"); 100 methodVisitor.visitInsn(RETURN); 101 methodVisitor.visitMaxs(0, 0); 102 methodVisitor.visitEnd(); 103 104 methodVisitor = 105 classWriter.visitMethod( 106 ACC_PUBLIC, "clone", "()Ljdk8/Artificial$()$Structures;", null, null); 107 methodVisitor.visitCode(); 108 methodVisitor.visitTypeInsn(NEW, INTERNAL_NAME); 109 methodVisitor.visitInsn(DUP); 110 methodVisitor.visitVarInsn(ALOAD, 0); 111 methodVisitor.visitMethodInsn( 112 INVOKESPECIAL, 113 INTERNAL_NAME, 114 "<init>", 115 "(Ljdk8/Artificial$()$Structures;)V", 116 false); 117 methodVisitor.visitInsn(ARETURN); 118 methodVisitor.visitMaxs(0, 0); 119 methodVisitor.visitEnd(); 120 121 methodVisitor = 122 classWriter.visitMethod( 123 ACC_PUBLIC + ACC_STATIC, "methodType", "()Ljava/lang/invoke/MethodType;", null, null); 124 methodVisitor.visitCode(); 125 methodVisitor.visitLdcInsn(Type.getMethodType("(I)I")); 126 methodVisitor.visitInsn(ARETURN); 127 methodVisitor.visitMaxs(0, 0); 128 methodVisitor.visitEnd(); 129 130 methodVisitor = 131 classWriter.visitMethod( 132 ACC_PUBLIC | ACC_STATIC, "frameWithForwardLabelReferences", "([Ljava/lang/String;)V", null, null); 133 methodVisitor.visitCode(); 134 methodVisitor.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;"); 135 Label labelNew = new Label(); 136 methodVisitor.visitJumpInsn(GOTO, labelNew); 137 138 Label labelInit = new Label(); 139 methodVisitor.visitLabel(labelInit); 140 methodVisitor.visitFrame( 141 Opcodes.F_NEW, 142 1, 143 new Object[] {"[Ljava/lang/String;"}, 144 3, 145 new Object[] {"java/io/PrintStream", labelNew, labelNew}); 146 methodVisitor.visitMethodInsn(INVOKESPECIAL, INTERNAL_NAME, "<init>", "()V", false); 147 Label labelAfterInit = new Label(); 148 methodVisitor.visitJumpInsn(GOTO, labelAfterInit); 149 150 methodVisitor.visitLabel(labelNew); 151 methodVisitor.visitFrame( 152 Opcodes.F_NEW, 153 1, 154 new Object[] {"[Ljava/lang/String;"}, 155 1, 156 new Object[] {"java/io/PrintStream"}); 157 methodVisitor.visitTypeInsn(NEW, INTERNAL_NAME); 158 methodVisitor.visitInsn(DUP); 159 methodVisitor.visitJumpInsn(GOTO, labelInit); 160 161 methodVisitor.visitLabel(labelAfterInit); 162 methodVisitor.visitFrame( 163 Opcodes.F_NEW, 164 1, 165 new Object[] {"[Ljava/lang/String;"}, 166 2, 167 new Object[] {"java/io/PrintStream", INTERNAL_NAME}); 168 methodVisitor.visitMethodInsn( 169 INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/Object;)V", false); 170 methodVisitor.visitInsn(RETURN); 171 methodVisitor.visitMaxs(3, 1); 172 methodVisitor.visitEnd(); 173 174 classWriter.visitEnd(); 175 return classWriter.toByteArray(); 176 } 177 } 178