KotlinUnsafeCastOperatorFilter.java
/*******************************************************************************
* Copyright (c) 2009, 2024 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.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 {
public void filter(final MethodNode methodNode,
final IFilterContext context, final IFilterOutput output) {
if (!KotlinGeneratedFilter.isKotlinClass(context)) {
return;
}
final Matcher matcher = new Matcher();
for (final AbstractInsnNode i : methodNode.instructions) {
matcher.match("kotlin/TypeCastException", i, output);
// Since Kotlin 1.4.0:
matcher.match("java/lang/NullPointerException", i, output);
}
}
private static class Matcher extends AbstractMatcher {
public void match(final String exceptionType,
final AbstractInsnNode start, final IFilterOutput output) {
if (Opcodes.IFNONNULL != start.getOpcode()) {
return;
}
cursor = start;
final JumpInsnNode jumpInsnNode = (JumpInsnNode) cursor;
final AbstractInsnNode next = cursor.getNext();
if (next != null && next.getOpcode() == Opcodes.POP) {
// Since Kotlin 1.6.0 - see
// https://github.com/JetBrains/kotlin/commit/041773fd2584bc279813361eb7fc11ae84c214fd
next();
}
nextIsType(Opcodes.NEW, exceptionType);
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, exceptionType, "<init>",
"(Ljava/lang/String;)V");
nextIs(Opcodes.ATHROW);
if (cursor == null) {
return;
}
if (cursor.getNext() != jumpInsnNode.label) {
return;
}
output.ignore(start, cursor);
}
}
}