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/*******************************************************************************
* Copyright (c) 2009, 2021 Mountainminds GmbH & Co. KG and Contributors
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Evgeny Mandrikov - initial API and implementation
*
*******************************************************************************/
package org.jacoco.core.internal.analysis.filter;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.tree.AbstractInsnNode;
import org.objectweb.asm.tree.MethodNode;
import org.objectweb.asm.tree.TryCatchBlockNode;
/**
* Filters code that is generated for synchronized statement.
*/
public final class SynchronizedFilter implements IFilter {
public void filter(final MethodNode methodNode,
final IFilterContext context, final IFilterOutput output) {
for (final TryCatchBlockNode tryCatch : methodNode.tryCatchBlocks) {
if (tryCatch.type != null) {
continue;
}
if (tryCatch.start == tryCatch.handler) {
continue;
}
final AbstractInsnNode to = new Matcher(tryCatch.handler).match();
if (to == null) {
continue;
}
output.ignore(tryCatch.handler, to);
}
}
private static class Matcher extends AbstractMatcher {
private final AbstractInsnNode start;
private Matcher(final AbstractInsnNode start) {
this.start = start;
}
private AbstractInsnNode match() {
if (nextIsEcj() || nextIsJavac()) {
return cursor;
}
return null;
}
private boolean nextIsJavac() {
cursor = start;
nextIsVar(Opcodes.ASTORE, "t");
nextIs(Opcodes.ALOAD);
nextIs(Opcodes.MONITOREXIT);
nextIsVar(Opcodes.ALOAD, "t");
nextIs(Opcodes.ATHROW);
return cursor != null;
}
private boolean nextIsEcj() {
cursor = start;
nextIs(Opcodes.ALOAD);
nextIs(Opcodes.MONITOREXIT);
nextIs(Opcodes.ATHROW);
return cursor != null;
}
}
}
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