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// ASM: a very small and fast Java bytecode manipulation framework
// Copyright (c) 2000-2011 INRIA, France Telecom
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// 3. Neither the name of the copyright holders nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
package jdk3;
import java.io.FileOutputStream;
import java.io.IOException;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.CodeComment;
import org.objectweb.asm.Comment;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
/**
* Generates a class with structures, instructions and patterns that cannot be produced by compiling
* a Java source file with the javac compiler. This includes:
*
* <ul>
* <li>the class, field and method Synthetic attribute (now replaced with an access flag),
* <li>the StackMap attribute (which was used for pre-verification in J2ME CLDC 1.1),
* <li>non standard class, field, method and code attributes,
* <li>the nop and swap instructions,
* <li>some variants of the dup_x2 and dup2_x2 instructions,
* <li>several line numbers per bytecode offset.
* </ul>
*
* Ideally we should not use ASM to generate this class (which is later used to test ASM), but this
* would be hard to do.
*
* @author Eric Bruneton
*/
public class DumpArtificialStructures implements Opcodes {
public static void main(String[] args) throws IOException {
FileOutputStream fileOutputStream = new FileOutputStream("ArtificialStructures.class");
fileOutputStream.write(dump());
fileOutputStream.close();
}
private static byte[] dump() {
ClassWriter classWriter = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
FieldVisitor fieldVisitor;
MethodVisitor methodVisitor;
classWriter.visit(
V1_3, ACC_PUBLIC + ACC_SUPER, "jdk3/ArtificialStructures", null, "java/lang/Object", null);
classWriter.visitSource("ArtificialStructures.java", "source-debug");
classWriter.visitAttribute(new Comment());
fieldVisitor = classWriter.visitField(ACC_PUBLIC + ACC_SYNTHETIC, "f", "I", null, null);
fieldVisitor.visitAttribute(new Comment());
fieldVisitor.visitEnd();
methodVisitor =
classWriter.visitMethod(
ACC_PUBLIC + ACC_SYNTHETIC, "<init>", "(Ljava/lang/String;)V", null, null);
methodVisitor.visitAttribute(new Comment());
methodVisitor.visitCode();
methodVisitor.visitVarInsn(ALOAD, 0);
methodVisitor.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
methodVisitor.visitInsn(NOP);
methodVisitor.visitInsn(RETURN);
methodVisitor.visitMaxs(0, 0);
methodVisitor.visitAttribute(new CodeComment());
methodVisitor.visitEnd();
methodVisitor = classWriter.visitMethod(0, "<init>", "(Z)V", null, null);
methodVisitor.visitCode();
methodVisitor.visitVarInsn(ILOAD, 1);
methodVisitor.visitVarInsn(ALOAD, 0);
methodVisitor.visitInsn(SWAP);
Label elseLabel = new Label();
methodVisitor.visitJumpInsn(IFEQ, elseLabel);
methodVisitor.visitLdcInsn("1");
Label endIfLabel = new Label();
methodVisitor.visitJumpInsn(GOTO, endIfLabel);
methodVisitor.visitLabel(elseLabel);
methodVisitor.visitLineNumber(1, elseLabel);
methodVisitor.visitLineNumber(3, elseLabel);
methodVisitor.visitLdcInsn("0");
methodVisitor.visitLabel(endIfLabel);
methodVisitor.visitLineNumber(5, endIfLabel);
methodVisitor.visitLineNumber(7, endIfLabel);
methodVisitor.visitLineNumber(11, endIfLabel);
methodVisitor.visitLineNumber(13, endIfLabel);
methodVisitor.visitLineNumber(17, endIfLabel);
methodVisitor.visitMethodInsn(
INVOKESPECIAL, "jdk3/ArtificialStructures", "<init>", "(Ljava/lang/String;)V", false);
methodVisitor.visitInsn(RETURN);
methodVisitor.visitMaxs(0, 0);
methodVisitor.visitEnd();
methodVisitor = classWriter.visitMethod(ACC_STATIC, "dup_x2", "(IJ)V", null, null);
methodVisitor.visitCode();
methodVisitor.visitVarInsn(LLOAD, 1);
methodVisitor.visitVarInsn(ILOAD, 0);
methodVisitor.visitInsn(DUP_X2);
methodVisitor.visitInsn(I2L);
methodVisitor.visitInsn(LADD);
methodVisitor.visitMethodInsn(
INVOKESTATIC, "jdk3/ArtificialStructures", "dup_x2", "(IJ)V", false);
methodVisitor.visitInsn(RETURN);
methodVisitor.visitMaxs(0, 0);
methodVisitor.visitEnd();
methodVisitor = classWriter.visitMethod(ACC_STATIC, "dup2_x2", "(IIII)V", null, null);
methodVisitor.visitCode();
methodVisitor.visitVarInsn(ILOAD, 3);
methodVisitor.visitVarInsn(ILOAD, 2);
methodVisitor.visitVarInsn(ILOAD, 1);
methodVisitor.visitVarInsn(ILOAD, 0);
methodVisitor.visitInsn(DUP2_X2);
methodVisitor.visitInsn(IADD);
methodVisitor.visitInsn(IADD);
methodVisitor.visitMethodInsn(
INVOKESTATIC, "jdk3/ArtificialStructures", "dup2_x2", "(IIII)V", false);
methodVisitor.visitInsn(RETURN);
methodVisitor.visitMaxs(0, 0);
methodVisitor.visitEnd();
methodVisitor = classWriter.visitMethod(ACC_STATIC, "dup2_x2", "(IIJ)V", null, null);
methodVisitor.visitCode();
methodVisitor.visitVarInsn(LLOAD, 2);
methodVisitor.visitVarInsn(ILOAD, 1);
methodVisitor.visitVarInsn(ILOAD, 0);
methodVisitor.visitInsn(DUP2_X2);
methodVisitor.visitInsn(IADD);
methodVisitor.visitInsn(I2L);
methodVisitor.visitInsn(LADD);
methodVisitor.visitMethodInsn(
INVOKESTATIC, "jdk3/ArtificialStructures", "dup2_x2", "(IIJ)V", false);
methodVisitor.visitInsn(RETURN);
methodVisitor.visitMaxs(0, 0);
methodVisitor.visitEnd();
methodVisitor = classWriter.visitMethod(ACC_STATIC, "dup2_x2", "(JD)V", null, null);
methodVisitor.visitCode();
methodVisitor.visitVarInsn(DLOAD, 2);
methodVisitor.visitVarInsn(LLOAD, 0);
methodVisitor.visitInsn(DUP2_X2);
methodVisitor.visitInsn(L2D);
methodVisitor.visitInsn(DADD);
methodVisitor.visitMethodInsn(
INVOKESTATIC, "jdk3/ArtificialStructures", "dup2_x2", "(JD)V", false);
methodVisitor.visitInsn(RETURN);
methodVisitor.visitMaxs(0, 0);
methodVisitor.visitEnd();
classWriter.visitEnd();
return classWriter.toByteArray();
}
}
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