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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:
* Evgeny Mandrikov - initial API and implementation
*
*******************************************************************************/
package org.jacoco.core.internal.instr;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.ConstantDynamic;
import org.jacoco.core.runtime.IExecutionDataAccessorGenerator;
import org.objectweb.asm.Handle;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
/**
* This strategy for Java 11+ class files uses {@link ConstantDynamic} to hold
* the probe array and adds bootstrap method requesting the probe array from the
* runtime.
*/
public class CondyProbeArrayStrategy implements IProbeArrayStrategy {
/**
* Descriptor of the bootstrap method.
*/
public static final String B_DESC = "(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/Class;)[Z";
private final String className;
private final boolean isInterface;
private final long classId;
private final IExecutionDataAccessorGenerator accessorGenerator;
CondyProbeArrayStrategy(final String className, final boolean isInterface,
final long classId,
final IExecutionDataAccessorGenerator accessorGenerator) {
this.className = className;
this.isInterface = isInterface;
this.classId = classId;
this.accessorGenerator = accessorGenerator;
}
public int storeInstance(final MethodVisitor mv, final boolean clinit,
final int variable) {
final Handle bootstrapMethod = new Handle(Opcodes.H_INVOKESTATIC,
className, InstrSupport.INITMETHOD_NAME, B_DESC, isInterface);
// As a workaround for https://bugs.openjdk.java.net/browse/JDK-8216970
// constant should have type Object
mv.visitLdcInsn(new ConstantDynamic(InstrSupport.DATAFIELD_NAME,
"Ljava/lang/Object;", bootstrapMethod));
mv.visitTypeInsn(Opcodes.CHECKCAST, "[Z");
mv.visitVarInsn(Opcodes.ASTORE, variable);
return 1;
}
public void addMembers(final ClassVisitor cv, final int probeCount) {
final MethodVisitor mv = cv.visitMethod(InstrSupport.INITMETHOD_ACC,
InstrSupport.INITMETHOD_NAME, B_DESC, null, null);
final int maxStack = accessorGenerator.generateDataAccessor(classId,
className, probeCount, mv);
mv.visitInsn(Opcodes.ARETURN);
mv.visitMaxs(maxStack, 3);
mv.visitEnd();
}
}
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