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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.agent.rt.internal;
import java.lang.instrument.Instrumentation;
import org.jacoco.core.runtime.AgentOptions;
import org.jacoco.core.runtime.IRuntime;
import org.jacoco.core.runtime.ModifiedSystemClassRuntime;
/**
* The agent which is referred as the <code>Premain-Class</code>. The agent
* configuration is provided with the agent parameters in the command line.
*/
public final class PreMain {
private PreMain() {
// no instances
}
/**
* This method is called by the JVM to initialize Java agents.
*
* @param options
* agent options
* @param inst
* instrumentation callback provided by the JVM
* @throws Exception
* in case initialization fails
*/
public static void premain(final String options, final Instrumentation inst)
throws Exception {
final AgentOptions agentOptions = new AgentOptions(options);
final Agent agent = Agent.getInstance(agentOptions);
final IRuntime runtime = createRuntime(inst);
runtime.startup(agent.getData());
inst.addTransformer(new CoverageTransformer(runtime, agentOptions,
IExceptionLogger.SYSTEM_ERR));
}
private static IRuntime createRuntime(final Instrumentation inst)
throws Exception {
return ModifiedSystemClassRuntime.createFor(inst, "java/lang/UnknownError");
}
}
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