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/*******************************************************************************
* Copyright (c) 2009, 2019 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.JumpInsnNode;
import org.objectweb.asm.tree.LdcInsnNode;
import org.objectweb.asm.tree.MethodNode;
/**
* Filters branch in bytecode that Kotlin compiler generates for "unsafe" cast
* operator.
*/
public final class KotlinUnsafeCastOperatorFilter implements IFilter {
private static final String KOTLIN_TYPE_CAST_EXCEPTION = "kotlin/TypeCastException";
public void filter(final MethodNode methodNode,
final IFilterContext context, final IFilterOutput output) {
final Matcher matcher = new Matcher();
for (AbstractInsnNode i = methodNode.instructions
.getFirst(); i != null; i = i.getNext()) {
matcher.match(i, output);
}
}
private static class Matcher extends AbstractMatcher {
public void match(final AbstractInsnNode start,
final IFilterOutput output) {
if (Opcodes.IFNONNULL != start.getOpcode()) {
return;
}
cursor = start;
nextIsType(Opcodes.NEW, KOTLIN_TYPE_CAST_EXCEPTION);
nextIs(Opcodes.DUP);
nextIs(Opcodes.LDC);
if (cursor == null) {
return;
}
final LdcInsnNode ldc = (LdcInsnNode) cursor;
if (!(ldc.cst instanceof String && ((String) ldc.cst)
.startsWith("null cannot be cast to non-null type"))) {
return;
}
nextIsInvoke(Opcodes.INVOKESPECIAL, KOTLIN_TYPE_CAST_EXCEPTION,
"<init>", "(Ljava/lang/String;)V");
nextIs(Opcodes.ATHROW);
if (cursor == null) {
return;
}
if (cursor.getNext() != ((JumpInsnNode) start).label) {
return;
}
output.ignore(start, cursor);
}
}
}
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