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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 java.util.HashSet;
import java.util.Set;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import org.objectweb.asm.tree.AbstractInsnNode;
import org.objectweb.asm.tree.JumpInsnNode;
import org.objectweb.asm.tree.MethodNode;
import org.objectweb.asm.tree.VarInsnNode;
/**
* Filters branches that Kotlin compiler generates for default arguments.
*
* For each default argument Kotlin compiler generates following bytecode to
* determine if it should be used or not:
*
* <pre>
* ILOAD maskVar
* ICONST_x, BIPUSH, SIPUSH, LDC or LDC_W
* IAND
* IFEQ label
* default argument
* label:
* </pre>
*
* Where <code>maskVar</code> is penultimate argument of synthetic method with
* suffix "$default". And its value can't be zero - invocation with all
* arguments uses original non synthetic method, thus <code>IFEQ</code>
* instructions should be ignored.
*/
public final class KotlinDefaultArgumentsFilter implements IFilter {
static boolean isDefaultArgumentsMethodName(final String methodName) {
return methodName.endsWith("$default");
}
public void filter(final MethodNode methodNode,
final IFilterContext context, final IFilterOutput output) {
if ((methodNode.access & Opcodes.ACC_SYNTHETIC) == 0) {
return;
}
if (!isDefaultArgumentsMethodName(methodNode.name)) {
return;
}
if (!KotlinGeneratedFilter.isKotlinClass(context)) {
return;
}
new Matcher().match(methodNode, output);
}
private static class Matcher extends AbstractMatcher {
public void match(final MethodNode methodNode,
final IFilterOutput output) {
cursor = methodNode.instructions.getFirst();
final Set<AbstractInsnNode> ignore = new HashSet<AbstractInsnNode>();
final int maskVar = Type.getMethodType(methodNode.desc)
.getArgumentTypes().length - 2;
while (true) {
if (cursor.getOpcode() != Opcodes.ILOAD) {
break;
}
if (((VarInsnNode) cursor).var != maskVar) {
break;
}
next();
nextIs(Opcodes.IAND);
nextIs(Opcodes.IFEQ);
if (cursor == null) {
return;
}
ignore.add(cursor);
cursor = ((JumpInsnNode) cursor).label;
skipNonOpcodes();
}
for (AbstractInsnNode i : ignore) {
output.ignore(i, i);
}
}
}
}
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