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/*******************************************************************************
* Copyright (c) 2009, 2018 Mountainminds GmbH & Co. KG and Contributors
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* 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.InsnNode;
import org.objectweb.asm.tree.JumpInsnNode;
import org.objectweb.asm.tree.MethodNode;
/**
* Filters bytecode that Kotlin compiler generates for <code>when</code>
* expressions which list all cases of <code>sealed class</code>, i.e. which
* don't require explicit <code>else</code>.
*/
public final class KotlinWhenSealedFilter implements IFilter {
private static final String EXCEPTION = "kotlin/NoWhenBranchMatchedException";
private final Matcher matcher = new Matcher();
public void filter(final MethodNode methodNode,
final IFilterContext context, final IFilterOutput output) {
for (AbstractInsnNode i = methodNode.instructions
.getFirst(); i != null; i = i.getNext()) {
matcher.match(i, output);
}
}
private static class Matcher extends AbstractMatcher {
void match(final AbstractInsnNode start, final IFilterOutput output) {
if (start.getType() != InsnNode.LABEL) {
return;
}
cursor = start;
nextIsNew(EXCEPTION);
nextIs(Opcodes.DUP);
nextIsInvokeSuper(EXCEPTION, "()V");
nextIs(Opcodes.ATHROW);
for (AbstractInsnNode i = cursor; i != null; i = i.getPrevious()) {
if (i.getOpcode() == Opcodes.IFEQ
&& ((JumpInsnNode) i).label == start) {
output.ignore(i, i);
output.ignore(start, cursor);
return;
}
}
}
}
}
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