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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 org.objectweb.asm.benchmarks;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import org.cojen.classfile.ClassFile;
import org.cojen.classfile.CodeBuilder;
import org.cojen.classfile.MethodInfo;
import org.cojen.classfile.Modifiers;
import org.cojen.classfile.TypeDesc;
/**
* A "Hello World!" class generator using the Cojen library.
*
* @author Eric Bruneton
*/
public class CojenGenerator extends Generator {
private static final TypeDesc PRINT_STREAM = TypeDesc.forClass("java.io.PrintStream");
@Override
public byte[] generateClass() {
ClassFile classFile = new ClassFile("HelloWorld");
classFile.setSourceFile("HelloWorld.java");
classFile.addDefaultConstructor();
TypeDesc[] params = new TypeDesc[] {TypeDesc.STRING.toArrayType()};
MethodInfo methodInfo = classFile.addMethod(Modifiers.PUBLIC_STATIC, "main", null, params);
CodeBuilder codeBuilder = new CodeBuilder(methodInfo);
codeBuilder.loadStaticField("java.lang.System", "out", PRINT_STREAM);
codeBuilder.loadConstant("Hello world!");
codeBuilder.invokeVirtual(PRINT_STREAM, "println", null, new TypeDesc[] {TypeDesc.STRING});
codeBuilder.returnVoid();
try {
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
classFile.writeTo(byteArrayOutputStream);
return byteArrayOutputStream.toByteArray();
} catch (IOException e) {
throw new RuntimeException("Class generation failed", e);
}
}
}
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