--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/src/jdk.compiler/share/classes/com/sun/tools/sjavac/comp/PathAndPackageVerifier.java	Tue Oct 07 21:21:42 2014 +0200
@@ -0,0 +1,147 @@
+/*
+ * 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;
+
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Set;
+
+import javax.tools.JavaFileObject;
+
+import com.sun.source.tree.CompilationUnitTree;
+import com.sun.source.util.TaskEvent;
+import com.sun.source.util.TaskListener;
+import com.sun.tools.javac.tree.JCTree;
+import com.sun.tools.javac.tree.JCTree.JCFieldAccess;
+import com.sun.tools.javac.tree.JCTree.JCIdent;
+import com.sun.tools.javac.util.DefinedBy;
+import com.sun.tools.javac.util.DefinedBy.Api;
+import com.sun.tools.javac.util.Name;
+
+public class PathAndPackageVerifier implements TaskListener {
+
+    // Stores the set of compilation units whose source file path does not
+    // match the package declaration.
+    Set<CompilationUnitTree> misplacedCompilationUnits = new HashSet<>();
+
+    @Override
+    @DefinedBy(Api.COMPILER_TREE)
+    public void started(TaskEvent e) {
+    }
+
+    @Override
+    @DefinedBy(Api.COMPILER_TREE)
+    public void finished(TaskEvent e) {
+        if (e.getKind() != TaskEvent.Kind.ANALYZE)
+            return;
+
+        CompilationUnitTree cu = e.getCompilationUnit();
+        if (cu == null)
+            return;
+
+        JavaFileObject jfo = cu.getSourceFile();
+        if (jfo == null)
+            return; // No source file -> package doesn't matter
+
+        JCTree pkg = (JCTree) cu.getPackageName();
+        if (pkg == null)
+            return; // Default package. See JDK-8048144.
+
+        Path dir = Paths.get(jfo.toUri()).normalize().getParent();
+        if (!checkPathAndPackage(dir, pkg))
+            misplacedCompilationUnits.add(cu);
+    }
+
+    /* Returns true if dir matches pkgName.
+     *
+     * Examples:
+     *     (a/b/c, a.b.c) gives true
+     *     (i/j/k, i.x.k) gives false
+     *
+     * Currently (x/a/b/c, a.b.c) also gives true. See JDK-8059598.
+     */
+    private boolean checkPathAndPackage(Path dir, JCTree pkgName) {
+        Iterator<String> pathIter = new ParentIterator(dir);
+        Iterator<String> pkgIter = new EnclosingPkgIterator(pkgName);
+        while (pathIter.hasNext() && pkgIter.hasNext()) {
+            if (!pathIter.next().equals(pkgIter.next()))
+                return false;
+        }
+        return !pkgIter.hasNext(); /*&& !pathIter.hasNext() See JDK-8059598 */
+    }
+
+    public Set<CompilationUnitTree> getMisplacedCompilationUnits() {
+        return misplacedCompilationUnits;
+    }
+
+    /* Iterates over the names of the parents of the given path:
+     * Example: dir1/dir2/dir3  results in  dir3 -> dir2 -> dir1
+     */
+    private static class ParentIterator implements Iterator<String> {
+        Path next;
+        ParentIterator(Path initial) {
+            next = initial;
+        }
+        @Override
+        public boolean hasNext() {
+            return next != null;
+        }
+        @Override
+        public String next() {
+            String tmp = next.getFileName().toString();
+            next = next.getParent();
+            return tmp;
+        }
+    }
+
+    /* Iterates over the names of the enclosing packages:
+     * Example: pkg1.pkg2.pkg3  results in  pkg3 -> pkg2 -> pkg1
+     */
+    private static class EnclosingPkgIterator implements Iterator<String> {
+        JCTree next;
+        EnclosingPkgIterator(JCTree initial) {
+            next = initial;
+        }
+        @Override
+        public boolean hasNext() {
+            return next != null;
+        }
+        @Override
+        public String next() {
+            Name name;
+            if (next instanceof JCIdent) {
+                name = ((JCIdent) next).name;
+                next = null;
+            } else {
+                JCFieldAccess fa = (JCFieldAccess) next;
+                name = fa.name;
+                next = fa.selected;
+            }
+            return name.toString();
+        }
+    }
+}