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/*******************************************************************************
* Copyright (c) 2014, 2019 Igor Fedorenko
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Igor Fedorenko - initial API and implementation
* IBM Corporation - ASM version update
*******************************************************************************/
package org.eclipse.jdt.launching.internal.weaving;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.Opcodes;
public class ClassfileTransformer {
// must match JDIHelpers.STRATA_ID
private static final String STRATA_ID = "jdt"; //$NON-NLS-1$
/** max supported java class format major version, must match {@link #ASM_API} below **/
public static final int MAX_CLASS_MAJOR = Opcodes.V18;
/** supported ASM API version, must match {@link #MAX_CLASS_MAJOR} above */
private static final int ASM_API = Opcodes.ASM9;
public byte[] transform(byte[] classfileBuffer, final String location) {
final ClassReader r = new ClassReader(classfileBuffer, 0, classfileBuffer.length);
final ClassWriter w = new ClassWriter(r, 0);
r.accept(new ClassVisitor(ASM_API, w) {
@Override
public void visitSource(String source, String debug) {
String javaSource = source;
// TODO merge SMAP if present (always present when used together with Equinox weaver)
if (debug == null) {
StringBuilder smap = new StringBuilder();
smap.append("SMAP\n"); //$NON-NLS-1$
smap.append(javaSource).append("\n"); //$NON-NLS-1$
// default strata name
smap.append("Java\n"); //$NON-NLS-1$
smap.append("*S " + STRATA_ID + "\n"); //$NON-NLS-1$ //$NON-NLS-2$
smap.append("*F\n"); //$NON-NLS-1$
smap.append("1 ").append(source).append("\n"); //$NON-NLS-1$ //$NON-NLS-2$
smap.append("2 ").append(location).append("\n"); //$NON-NLS-1$ //$NON-NLS-2$
// JSR-045, StratumSection
// "One FileSection and one LineSection (in either order) must follow the StratumSection"
smap.append("*L\n"); //$NON-NLS-1$
smap.append("*E\n"); //$NON-NLS-1$
debug = smap.toString();
}
super.visitSource(javaSource, debug);
}
}, 0);
return w.toByteArray();
}
}
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