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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 jdk8;
import java.io.FileOutputStream;
import java.io.IOException;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Label;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
/**
* Generates a class with structures, instructions and patterns that cannot be produced by compiling
* a Java source file with the javac compiler. This includes LDC instructions with MethodType
* constants.
*
* <p>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("Artificial$()$Structures.class");
fileOutputStream.write(dump());
fileOutputStream.close();
}
private static byte[] dump() {
ClassWriter classWriter = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
MethodVisitor methodVisitor;
classWriter.visit(
V1_8,
ACC_PUBLIC + ACC_SUPER,
"jdk8/Artificial$()$Structures",
null,
"java/lang/Object",
null);
classWriter.visitField(ACC_PUBLIC, "value", "I", null, null).visitEnd();
methodVisitor = classWriter.visitMethod(ACC_PUBLIC, "<init>", "(I)V", null, null);
methodVisitor.visitCode();
methodVisitor.visitVarInsn(ALOAD, 0);
methodVisitor.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
methodVisitor.visitVarInsn(ALOAD, 0);
methodVisitor.visitVarInsn(ILOAD, 1);
methodVisitor.visitFieldInsn(PUTFIELD, "jdk8/Artificial$()$Structures", "value", "I");
methodVisitor.visitInsn(RETURN);
methodVisitor.visitMaxs(0, 0);
methodVisitor.visitEnd();
methodVisitor =
classWriter.visitMethod(
ACC_PRIVATE, "<init>", "(Ljdk8/Artificial$()$Structures;)V", null, null);
methodVisitor.visitCode();
methodVisitor.visitVarInsn(ALOAD, 0);
methodVisitor.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
methodVisitor.visitVarInsn(ALOAD, 0);
methodVisitor.visitVarInsn(ALOAD, 1);
Label elseLabel = new Label();
methodVisitor.visitJumpInsn(IFNULL, elseLabel);
methodVisitor.visitVarInsn(ALOAD, 1);
methodVisitor.visitFieldInsn(GETFIELD, "jdk8/Artificial$()$Structures", "value", "I");
Label endIfLabel = new Label();
methodVisitor.visitJumpInsn(GOTO, endIfLabel);
methodVisitor.visitLabel(elseLabel);
methodVisitor.visitInsn(ICONST_0);
methodVisitor.visitLabel(endIfLabel);
methodVisitor.visitFieldInsn(PUTFIELD, "jdk8/Artificial$()$Structures", "value", "I");
methodVisitor.visitInsn(RETURN);
methodVisitor.visitMaxs(0, 0);
methodVisitor.visitEnd();
methodVisitor =
classWriter.visitMethod(
ACC_PUBLIC, "clone", "()Ljdk8/Artificial$()$Structures;", null, null);
methodVisitor.visitCode();
methodVisitor.visitTypeInsn(NEW, "jdk8/Artificial$()$Structures");
methodVisitor.visitInsn(DUP);
methodVisitor.visitVarInsn(ALOAD, 0);
methodVisitor.visitMethodInsn(
INVOKESPECIAL,
"jdk8/Artificial$()$Structures",
"<init>",
"(Ljdk8/Artificial$()$Structures;)V",
false);
methodVisitor.visitInsn(ARETURN);
methodVisitor.visitMaxs(0, 0);
methodVisitor.visitEnd();
methodVisitor =
classWriter.visitMethod(
ACC_PUBLIC + ACC_STATIC, "methodType", "()Ljava/lang/invoke/MethodType;", null, null);
methodVisitor.visitCode();
methodVisitor.visitLdcInsn(Type.getMethodType("(I)I"));
methodVisitor.visitInsn(ARETURN);
methodVisitor.visitMaxs(0, 0);
methodVisitor.visitEnd();
classWriter.visitEnd();
return classWriter.toByteArray();
}
}
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