--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/src/jdk.compiler/share/classes/com/sun/tools/sjavac/comp/dependencies/DependencyScanner.java	Tue Oct 07 21:15:10 2014 +0200
@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2014, 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 com.sun.tools.sjavac.comp.dependencies;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import com.sun.tools.javac.code.Symbol;
+import com.sun.tools.javac.code.Symbol.ClassSymbol;
+import com.sun.tools.javac.code.Symbol.PackageSymbol;
+import com.sun.tools.javac.code.Type;
+import com.sun.tools.javac.code.TypeTag;
+import com.sun.tools.javac.tree.JCTree.JCFieldAccess;
+import com.sun.tools.javac.tree.JCTree.JCIdent;
+import com.sun.tools.javac.tree.TreeScanner;
+
+class DependencyScanner extends TreeScanner {
+
+    public final Set<Dependency> dependencies = new HashSet<>();
+
+    private boolean isValidDependency(Type t) {
+        if (t == null || t.isPrimitiveOrVoid() || t.isErroneous())
+            return false;
+        TypeTag tag = t.getTag();
+        return tag != TypeTag.PACKAGE
+            && tag != TypeTag.METHOD
+            && tag != TypeTag.ARRAY
+            && tag != TypeTag.TYPEVAR;
+    }
+
+    @Override
+    public void visitIdent(JCIdent tree) {
+        if (isValidDependency(tree.type))
+            dependencies.add(new TypeAndSupertypesDependency(tree.type.tsym));
+        super.visitIdent(tree);
+    }
+
+    @Override
+    public void visitSelect(JCFieldAccess tree) {
+        if (tree.getIdentifier().contentEquals("*")) {
+            Symbol sym = tree.selected instanceof JCIdent ? ((JCIdent) tree.selected).sym
+                                                          : ((JCFieldAccess) tree.selected).sym;
+            if (sym instanceof ClassSymbol) {
+                ClassSymbol clsSym = (ClassSymbol) sym;
+                dependencies.add(new TypeAndSupertypesDependency(clsSym.type.tsym));
+            } else {
+                dependencies.add(new PackageDependency((PackageSymbol) sym));
+            }
+        } else if (tree.type != null && tree.type.hasTag(TypeTag.METHOD)) {  // Method call? Depend on the result (even though we never access it elsewhere)
+            Type retType = tree.type.getReturnType();
+            if (isValidDependency(retType))
+                dependencies.add(new TypeAndSupertypesDependency(retType.tsym));
+        } else if (isValidDependency(tree.type)) {
+            dependencies.add(new TypeAndSupertypesDependency(tree.type.tsym));
+        }
+        super.visitSelect(tree);
+    }
+
+    public Set<Dependency> getResult() {
+        return dependencies;
+    }
+}