diff -r 000000000000 -r b1fe994d4267 rt/vm/src/main/java/org/apidesign/vm4brwsr/ExportedSymbols.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rt/vm/src/main/java/org/apidesign/vm4brwsr/ExportedSymbols.java	Fri Apr 26 18:48:34 2013 +0200
@@ -0,0 +1,148 @@
+/**
+ * Back 2 Browser Bytecode Translator
+ * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ *
+ * This program 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 for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. Look for COPYING file in the top folder.
+ * If not, see http://opensource.org/licenses/GPL-2.0.
+ */
+package org.apidesign.vm4brwsr;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.HashMap;
+import java.util.Map;
+import org.apidesign.bck2brwsr.core.ExtraJavaScript;
+import org.apidesign.vm4brwsr.ByteCodeParser.AnnotationParser;
+import org.apidesign.vm4brwsr.ByteCodeParser.ClassData;
+import org.apidesign.vm4brwsr.ByteCodeParser.FieldData;
+import org.apidesign.vm4brwsr.ByteCodeParser.MethodData;
+
+@ExtraJavaScript(processByteCode = false, resource="")
+final class ExportedSymbols {
+    private final Bck2Brwsr.Resources resources;
+    private final Map<Object, Boolean> isMarkedAsExportedCache;
+
+    ExportedSymbols(final Bck2Brwsr.Resources resources) {
+        this.resources = resources;
+
+        isMarkedAsExportedCache = new HashMap<Object, Boolean>();
+    }
+
+    boolean isExported(ClassData classData) throws IOException {
+        return classData.isPublic() && isMarkedAsExportedPackage(
+                                           classData.getPkgName())
+                   || isMarkedAsExported(classData);
+    }
+
+    boolean isExported(MethodData methodData) throws IOException {
+        return isAccessible(methodData.access) && isExported(methodData.cls)
+                   || isMarkedAsExported(methodData);
+    }
+
+    boolean isExported(FieldData fieldData) throws IOException {
+        return isAccessible(fieldData.access) && isExported(fieldData.cls)
+                   || isMarkedAsExported(fieldData);
+    }
+
+    private boolean isMarkedAsExportedPackage(String pkgName) {
+        if (pkgName == null) {
+            return false;
+        }
+
+        final Boolean cachedValue = isMarkedAsExportedCache.get(pkgName);
+        if (cachedValue != null) {
+            return cachedValue;
+        }
+
+        final boolean newValue = resolveIsMarkedAsExportedPackage(pkgName);
+        isMarkedAsExportedCache.put(pkgName, newValue);
+
+        return newValue;
+    }
+
+    private boolean isMarkedAsExported(ClassData classData)
+            throws IOException {
+        final Boolean cachedValue = isMarkedAsExportedCache.get(classData);
+        if (cachedValue != null) {
+            return cachedValue;
+        }
+
+        final boolean newValue =
+                isMarkedAsExported(classData.findAnnotationData(true),
+                                   classData);
+        isMarkedAsExportedCache.put(classData, newValue);
+
+        return newValue;
+    }
+
+    private boolean isMarkedAsExported(MethodData methodData)
+            throws IOException {
+        return isMarkedAsExported(methodData.findAnnotationData(true),
+                                  methodData.cls);
+    }
+
+    private boolean isMarkedAsExported(FieldData fieldData)
+            throws IOException {
+        return isMarkedAsExported(fieldData.findAnnotationData(true),
+                                  fieldData.cls);
+    }
+
+    private boolean resolveIsMarkedAsExportedPackage(String pkgName) {
+        try {
+            final InputStream is =
+                    resources.get(pkgName + "/package-info.class");
+            if (is == null) {
+                return false;
+            }
+
+            try {
+                final ClassData pkgInfoClass = new ClassData(is);
+                return isMarkedAsExported(
+                               pkgInfoClass.findAnnotationData(true),
+                               pkgInfoClass);
+            } finally {
+                is.close();
+            }
+        } catch (final IOException e) {
+            return false;
+        }
+    }
+
+    private boolean isMarkedAsExported(byte[] arrData, ClassData cd)
+            throws IOException {
+        if (arrData == null) {
+            return false;
+        }
+
+        final boolean[] found = { false };
+        final AnnotationParser annotationParser =
+                new AnnotationParser(false, false) {
+                    @Override
+                    protected void visitAnnotationStart(
+                            String type,
+                            boolean top) {
+                        if (top && type.equals("Lorg/apidesign/bck2brwsr"
+                                                   + "/core/Exported;")) {
+                            found[0] = true;
+                        }
+                    }
+                };
+        annotationParser.parse(arrData, cd);
+        return found[0];
+    }
+
+    private static boolean isAccessible(int access) {
+        return (access & (ByteCodeParser.ACC_PUBLIC
+                              | ByteCodeParser.ACC_PROTECTED)) != 0;
+    }
+}