org.jacoco.core.internal.instr.CondyProbeArrayStrategy.java Source code

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Here is the source code for org.jacoco.core.internal.instr.CondyProbeArrayStrategy.java

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/*******************************************************************************
 * Copyright (c) 2009, 2019 Mountainminds GmbH & Co. KG and Contributors
 * This program and the accompanying materials are made available under
 * the terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *    Evgeny Mandrikov - initial API and implementation
 *
 *******************************************************************************/
package org.jacoco.core.internal.instr;

import org.jacoco.core.runtime.IExecutionDataAccessorGenerator;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.ConstantDynamic;
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();
    }

}