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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;
import org.objectweb.asm.Opcodes;
/**
* This {@link IRuntime} implementation makes the execution data available
* through a special entry in the {@link System#getProperties()} hash table. The
* advantage is, that the instrumented classes do not get dependencies to other
* classes than the JRE library itself.
*
* This runtime may cause problems in environments with security restrictions,
* in applications that replace the system properties or in applications that
* fail if non-String values are placed in the system properties.
*/
public class SystemPropertiesRuntime extends AbstractRuntime {
private static final String KEYPREFIX = "jacoco-";
private final String key;
/**
* Creates a new runtime.
*/
public SystemPropertiesRuntime() {
super();
this.key = KEYPREFIX + Integer.toHexString(hashCode());
}
public int generateDataAccessor(final long classid, final String classname,
final int probecount, final MethodVisitor mv) {
mv.visitMethodInsn(Opcodes.INVOKESTATIC, "java/lang/System",
"getProperties", "()Ljava/util/Properties;", false);
// Stack[0]: Ljava/util/Properties;
mv.visitLdcInsn(key);
// Stack[1]: Ljava/lang/String;
// Stack[0]: Ljava/util/Properties;
mv.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/util/Properties",
"get", "(Ljava/lang/Object;)Ljava/lang/Object;", false);
// Stack[0]: Ljava/lang/Object;
RuntimeData.generateAccessCall(classid, classname, probecount, mv);
// Stack[0]: [Z
return 6; // Maximum local stack size is 3
}
@Override
public void startup(final RuntimeData data) throws Exception {
super.startup(data);
System.getProperties().put(key, data);
}
public void shutdown() {
System.getProperties().remove(key);
}
}
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