JDK 11 jdk.hotspot.agent.jmod is the JMOD file for JDK 11 Hotspot Agent module.

JDK 11 Hotspot Agent module compiled class files are stored in \fyicenter\jdk-11.0.1\jmods\jdk.hotspot.agent.jmod.

JDK 11 Hotspot Agent module compiled class files are also linked and stored in the \fyicenter\jdk-11.0.1\lib\modules JImage file.

JDK 11 Hotspot Agent module source code files are stored in \fyicenter\jdk-11.0.1\lib\src.zip\jdk.hotspot.agent.

You can click and view the content of each source code file in the list below.

⏎ sun/jvm/hotspot/oops/CounterData.java

/*
 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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package sun.jvm.hotspot.oops;

import java.io.*;
import java.util.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.types.*;
import sun.jvm.hotspot.utilities.*;

// CounterData
//
// A CounterData corresponds to a simple counter.
public class CounterData extends BitData {

  static final int countOff = 0;
  static final int counterCellCount = 1;

  public CounterData(DataLayout layout) {
    super(layout);
  }

  static int staticCellCount() {
    return counterCellCount;
  }

  public int cellCount() {
    return staticCellCount();
  }

  // Direct accessor
  int count() {
    return uintAt(countOff);
  }

  // Code generation support
  static int countOffset() {
    return cellOffset(countOff);
  }
  static int counterDataSize() {
    return cellOffset(counterCellCount);
  }

  public void printDataOn(PrintStream st) {
    printShared(st, "CounterData");
    st.println("count(" + count() + ")");
  }
}

⏎ sun/jvm/hotspot/oops/CounterData.java

Or download all of them as a single archive file:

File name: jdk.hotspot.agent-11.0.1-src.zip
File size: 1243786 bytes
Release date: 2018-11-04
Download 

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