--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/make/jdk/src/classes/build/tools/taglet/ModuleGraph.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package build.tools.taglet;
+
+import java.util.EnumSet;
+import java.util.List;
+import java.util.Set;
+import javax.lang.model.element.Element;
+import javax.lang.model.element.ModuleElement;
+import com.sun.source.doctree.DocTree;
+import jdk.javadoc.doclet.Taglet;
+import static jdk.javadoc.doclet.Taglet.Location.*;
+
+/**
+ * A block tag to optionally insert a reference to a module graph.
+ */
+public class ModuleGraph implements Taglet {
+    private static final boolean enableModuleGraph =
+        Boolean.getBoolean("enableModuleGraph");
+
+    /** Returns the set of locations in which a taglet may be used. */
+    @Override
+    public Set<Location> getAllowedLocations() {
+        return EnumSet.of(MODULE);
+    }
+
+    @Override
+    public boolean isInlineTag() {
+        return false;
+    }
+
+    @Override
+    public String getName() {
+        return "moduleGraph";
+    }
+
+    @Override
+    public String toString(List<? extends DocTree> tags, Element element) {
+        if (!enableModuleGraph) {
+            return "";
+        }
+
+        String moduleName = ((ModuleElement) element).getQualifiedName().toString();
+        String imageFile = moduleName + "-graph.png";
+        int thumbnailHeight = -1;
+        String hoverImage = "";
+        if (!moduleName.equals("java.base")) {
+            thumbnailHeight = 100; // also appears in the stylesheet
+            hoverImage = "<span>"
+                + getImage(moduleName, imageFile, -1, true)
+                + "</span>";
+        }
+        return "<dt>"
+            + "<span class=\"simpleTagLabel\">Module Graph:</span>\n"
+            + "</dt>"
+            + "<dd>"
+            + "<a class=moduleGraph href=\"" + imageFile + "\">"
+            + getImage(moduleName, imageFile, thumbnailHeight, false)
+            + hoverImage
+            + "</a>"
+            + "</dd>";
+    }
+
+    private static final String VERTICAL_ALIGN = "vertical-align:top";
+    private static final String BORDER = "border: solid lightgray 1px;";
+
+    private String getImage(String moduleName, String file, int height, boolean useBorder) {
+        return String.format("<img style=\"%s\" alt=\"Module graph for %s\" src=\"%s\"%s>",
+                             useBorder ? BORDER + " " + VERTICAL_ALIGN : VERTICAL_ALIGN,
+                             moduleName,
+                             file,
+                             (height <= 0 ? "" : " height=\"" + height + "\""));
+    }
+}