content: /*******************************************************************************
   * 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();
  	}
  
  }
  