KotlinLateinitFilter.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:
* Fabian Mastenbroek - 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.LabelNode;
import org.objectweb.asm.tree.MethodNode;
/**
* Filters branch in bytecode that Kotlin compiler generates for reading from
* <code>lateinit</code> properties.
*/
public class KotlinLateinitFilter implements IFilter {
public void filter(final MethodNode methodNode,
final IFilterContext context, final IFilterOutput output) {
final Matcher matcher = new Matcher();
for (final AbstractInsnNode node : methodNode.instructions) {
matcher.match(node, output);
}
}
private static class Matcher extends AbstractMatcher {
public void match(final AbstractInsnNode start,
final IFilterOutput output) {
if (Opcodes.IFNONNULL == start.getOpcode()) {
cursor = start;
nextIsIntrinsic();
final LabelNode label = ((JumpInsnNode) start).label;
if (cursor != null && cursor.getNext() == label) {
// Kotlin 1.2
output.ignore(start, cursor);
return;
}
next();
if (cursor != null && cursor.getNext() == label) {
// Kotlin 1.6.20
output.ignore(start, cursor);
return;
}
next();
if (cursor != null && cursor.getNext() == label) {
// Kotlin 1.5.0 or 1.5.30
output.ignore(start, cursor);
}
} else if (Opcodes.IFNULL == start.getOpcode()) {
cursor = ((JumpInsnNode) start).label;
nextIsIntrinsic();
next();
next();
if (cursor != null && (Opcodes.ARETURN == cursor.getOpcode()
|| Opcodes.ATHROW == cursor.getOpcode())) {
output.ignore(start, start);
output.ignore(((JumpInsnNode) start).label, cursor);
}
}
}
private void nextIsIntrinsic() {
next();
if (cursor == null) {
return;
} else if (Opcodes.POP == cursor.getOpcode()) {
nextIs(Opcodes.LDC);
} else if (Opcodes.LDC != cursor.getOpcode()) {
cursor = null;
return;
}
nextIsInvoke(Opcodes.INVOKESTATIC, "kotlin/jvm/internal/Intrinsics",
"throwUninitializedPropertyAccessException",
"(Ljava/lang/String;)V");
}
}
}