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/utilities/MarkBits.java

/*
 * Copyright (c) 2001, 2015, 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.utilities;

import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.gc.shared.*;
import sun.jvm.hotspot.memory.*;
import sun.jvm.hotspot.oops.*;
import sun.jvm.hotspot.runtime.*;

/** Helper class which covers the reserved area of the heap with an
    (object-external) set of mark bits, used for GC-like scans through
    the heap like liveness analysis. */

public class MarkBits {
  public MarkBits(CollectedHeap heap) {
    MemRegion reserved = heap.reservedRegion();
    // Must cover "reserved" with one bit for each OopHandle
    start = reserved.start();
    end   = reserved.end();
    long numOopHandles = end.minus(start) / VM.getVM().getOopSize();
    // FIXME: will have trouble with larger heap sizes
    bits = new BitMap((int) numOopHandles);
  }

  public void clear() {
    bits.clear();
  }

  /** Returns true if a mark was newly placed for the given Oop, or
      false if the Oop was already marked. If the Oop happens to lie
      outside the heap (should not happen), prints a warning and
      returns false. */
  public boolean mark(Oop obj) {
    if (obj == null) {
      System.err.println("MarkBits: WARNING: null object, ignoring");
      return false;
    }

    OopHandle handle = obj.getHandle();
    // FIXME: will have trouble with larger heap sizes
    long idx = handle.minus(start) / VM.getVM().getOopSize();
    if ((idx < 0) || (idx >= bits.size())) {
      System.err.println("MarkBits: WARNING: object " + handle + " outside of heap, ignoring");
      return false;
    }
    int intIdx = (int) idx;
    if (bits.at(intIdx)) {
      return false; // already marked
    }
    bits.atPut(intIdx, true);
    return true;
  }

  /** Forces clearing of a given mark bit. */
  public void clear(Oop obj) {
    OopHandle handle = obj.getHandle();
    // FIXME: will have trouble with larger heap sizes
    long idx = handle.minus(start) / VM.getVM().getOopSize();
    if ((idx < 0) || (idx >= bits.size())) {
      System.err.println("MarkBits: WARNING: object " + handle + " outside of heap, ignoring");
      return;
    }
    int intIdx = (int) idx;
    bits.atPut(intIdx, false);
  }

  private BitMap  bits;
  private Address start;
  private Address end;
}

⏎ sun/jvm/hotspot/utilities/MarkBits.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
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