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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.MethodNode;
/**
* Filters private empty constructors that do not have arguments.
*/
public final class PrivateEmptyNoArgConstructorFilter implements IFilter {
private static final String CONSTRUCTOR_NAME = "<init>";
private static final String CONSTRUCTOR_DESC = "()V";
public void filter(final MethodNode methodNode,
final IFilterContext context, final IFilterOutput output) {
if ((methodNode.access & Opcodes.ACC_PRIVATE) != 0
&& CONSTRUCTOR_NAME.equals(methodNode.name)
&& CONSTRUCTOR_DESC.equals(methodNode.desc) && new Matcher()
.match(methodNode, context.getSuperClassName())) {
output.ignore(methodNode.instructions.getFirst(),
methodNode.instructions.getLast());
}
}
private static class Matcher extends AbstractMatcher {
private boolean match(final MethodNode methodNode,
final String superClassName) {
firstIsALoad0(methodNode);
nextIsInvoke(Opcodes.INVOKESPECIAL, superClassName,
CONSTRUCTOR_NAME, CONSTRUCTOR_DESC);
nextIs(Opcodes.RETURN);
return cursor != null;
}
}
}
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