| /******************************************************************************* |
| * 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: |
| * Marc R. Hoffmann - initial API and implementation |
| * |
| *******************************************************************************/ |
| package org.jacoco.core.internal.instr; |
| |
| import org.jacoco.core.internal.data.CRC64; |
| import org.jacoco.core.internal.flow.ClassProbesAdapter; |
| import org.jacoco.core.runtime.IExecutionDataAccessorGenerator; |
| import org.objectweb.asm.ClassReader; |
| import org.objectweb.asm.Opcodes; |
| |
| /** |
| * Factory to find a suitable strategy to access the probe array for a given |
| * class. |
| */ |
| public final class ProbeArrayStrategyFactory { |
| |
| private ProbeArrayStrategyFactory() { |
| } |
| |
| /** |
| * Creates a suitable strategy instance for the class described by the given |
| * reader. Created instance must be used only to process a class or |
| * interface for which it has been created and must be used only once. |
| * |
| * @param reader |
| * reader to get information about the class |
| * @param accessorGenerator |
| * accessor to the coverage runtime |
| * @return strategy instance |
| */ |
| public static IProbeArrayStrategy createFor(final ClassReader reader, |
| final IExecutionDataAccessorGenerator accessorGenerator) { |
| |
| final String className = reader.getClassName(); |
| final int version = getVersion(reader); |
| final long classId = CRC64.classId(reader.b); |
| final boolean withFrames = version >= Opcodes.V1_6; |
| |
| if (isInterfaceOrModule(reader)) { |
| final ProbeCounter counter = getProbeCounter(reader); |
| if (counter.getCount() == 0) { |
| return new NoneProbeArrayStrategy(); |
| } |
| if (version >= Opcodes.V1_8 && counter.hasMethods()) { |
| return new InterfaceFieldProbeArrayStrategy(className, classId, |
| counter.getCount(), accessorGenerator); |
| } else { |
| return new LocalProbeArrayStrategy(className, classId, |
| counter.getCount(), accessorGenerator); |
| } |
| } else { |
| return new ClassFieldProbeArrayStrategy(className, classId, |
| withFrames, accessorGenerator); |
| } |
| } |
| |
| private static boolean isInterfaceOrModule(final ClassReader reader) { |
| return (reader.getAccess() |
| & (Opcodes.ACC_INTERFACE | Opcodes.ACC_MODULE)) != 0; |
| } |
| |
| private static int getVersion(final ClassReader reader) { |
| return reader.readShort(6); |
| } |
| |
| private static ProbeCounter getProbeCounter(final ClassReader reader) { |
| final ProbeCounter counter = new ProbeCounter(); |
| reader.accept(new ClassProbesAdapter(counter, false), 0); |
| return counter; |
| } |
| |
| } |