1 /******************************************************************************* 2 * Copyright (c) 2009, 2019 Mountainminds GmbH & Co. KG and Contributors 3 * All rights reserved. This program and the accompanying materials 4 * are made available under the terms of the Eclipse Public License v1.0 5 * which accompanies this distribution, and is available at 6 * http://www.eclipse.org/legal/epl-v10.html 7 * 8 * Contributors: 9 * Marc R. Hoffmann - initial API and implementation 10 * 11 *******************************************************************************/ 12 package org.jacoco.core.runtime; 13 14 import org.objectweb.asm.MethodVisitor; 15 16 /** 17 * The instrumented classes need a piece of code that obtains a 18 * <code>boolean[]</code> instance from the runtime. The mechanism is runtime 19 * specific and therefore abstracted by this interface. Implementations are 20 * provided by {@link IRuntime} implementations and are used by the 21 * instrumentation process. 22 */ 23 public interface IExecutionDataAccessorGenerator { 24 25 /** 26 * This method generates the byte code required to obtain the coverage data 27 * structure for the class with the given id. Typically the instrumentation 28 * process will embed this code into a method that is called on class 29 * initialization. This method can be called at any time even outside the 30 * target VM. 31 * 32 * The generated code must push a <code>boolean[]</code> instance to the 33 * operand stack. Except this result object the generated code must not make 34 * any assumptions about the structure of the embedding method or class. The 35 * generated code must not use or allocate local variables. 36 * 37 * @param classid 38 * identifier of the class 39 * @param classname 40 * VM class name 41 * @param probecount 42 * probe count for this class 43 * @param mv 44 * code output 45 * @return additional stack size required by the implementation, including 46 * the instance pushed to the stack 47 */ generateDataAccessor(long classid, String classname, int probecount, MethodVisitor mv)48 int generateDataAccessor(long classid, String classname, int probecount, 49 MethodVisitor mv); 50 51 } 52