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/*******************************************************************************
* Copyright (c) 2009, 2020 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 empty enum constructors.
*
* Constructor of enum is invoked from static initialization block to create
* instance of each enum constant. So it won't be executed if number of enum
* constants is zero. Such enums are sometimes used as alternative to classes
* with static utilities and private empty constructor. Implicit constructor of
* enum created by compiler doesn't have a synthetic flag and refers to a line
* of enum definition. Therefore in order to not have partial coverage of enum
* definition line in enums without enum constants and similarly to
* {@link PrivateEmptyNoArgConstructorFilter filter of private empty
* constructors} - empty constructor in enums without additional parameters
* should be filtered out even if it is not implicit.
*/
public final class EnumEmptyConstructorFilter implements IFilter {
private static final String CONSTRUCTOR_NAME = "<init>";
private static final String CONSTRUCTOR_DESC = "(Ljava/lang/String;I)V";
private static final String ENUM_TYPE = "java/lang/Enum";
public void filter(final MethodNode methodNode,
final IFilterContext context, final IFilterOutput output) {
if (ENUM_TYPE.equals(context.getSuperClassName())
&& CONSTRUCTOR_NAME.equals(methodNode.name)
&& CONSTRUCTOR_DESC.equals(methodNode.desc)
&& new Matcher().match(methodNode)) {
output.ignore(methodNode.instructions.getFirst(),
methodNode.instructions.getLast());
}
}
private static class Matcher extends AbstractMatcher {
private boolean match(final MethodNode methodNode) {
firstIsALoad0(methodNode);
nextIs(Opcodes.ALOAD);
nextIs(Opcodes.ILOAD);
nextIsInvoke(Opcodes.INVOKESPECIAL, ENUM_TYPE, CONSTRUCTOR_NAME,
CONSTRUCTOR_DESC);
nextIs(Opcodes.RETURN);
return cursor != null;
}
}
}
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