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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:
* Marc R. Hoffmann - initial API and implementation
*
*******************************************************************************/
package org.jacoco.core.runtime;
import org.objectweb.asm.MethodVisitor;
/**
* The instrumented classes need a piece of code that obtains a
* <code>boolean[]</code> instance from the runtime. The mechanism is runtime
* specific and therefore abstracted by this interface. Implementations are
* provided by {@link IRuntime} implementations and are used by the
* instrumentation process.
*/
public interface IExecutionDataAccessorGenerator {
/**
* This method generates the byte code required to obtain the coverage data
* structure for the class with the given id. Typically the instrumentation
* process will embed this code into a method that is called on class
* initialization. This method can be called at any time even outside the
* target VM.
*
* The generated code must push a <code>boolean[]</code> instance to the
* operand stack. Except this result object the generated code must not make
* any assumptions about the structure of the embedding method or class. The
* generated code must not use or allocate local variables.
*
* @param classid
* identifier of the class
* @param classname
* VM class name
* @param probecount
* probe count for this class
* @param mv
* code output
* @return additional stack size required by the implementation, including
* the instance pushed to the stack
*/
int generateDataAccessor(long classid, String classname, int probecount,
MethodVisitor mv);
}
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