8020015: shared PropertyMaps should not be used without duplication

Reviewed-by: hannesw, attila

31 files changed, 385 insertions, 230 deletions

diff --git a/buildtools/nasgen/build.xml b/buildtools/nasgen/build.xml
index bf56c111..6243bb2f 100644
--- a/buildtools/nasgen/build.xml
+++ b/buildtools/nasgen/build.xml
@@ -42,7 +42,8 @@
            destdir="${build.classes.dir}"
            classpath="${javac.classpath}"
            debug="${javac.debug}"
-           includeantruntime="false">
+           includeantruntime="false" fork="true">
+      <compilerarg value="-J-Djava.ext.dirs="/>
       <compilerarg value="-Xlint:unchecked"/>
       <compilerarg value="-Xlint:deprecation"/>
       <compilerarg value="-XDignore.symbol.file"/>
diff --git a/buildtools/nasgen/src/jdk/nashorn/internal/tools/nasgen/ClassGenerator.java b/buildtools/nasgen/src/jdk/nashorn/internal/tools/nasgen/ClassGenerator.java
index ed0eee61..3425e9fd 100644
--- a/buildtools/nasgen/src/jdk/nashorn/internal/tools/nasgen/ClassGenerator.java
+++ b/buildtools/nasgen/src/jdk/nashorn/internal/tools/nasgen/ClassGenerator.java
@@ -37,14 +37,24 @@ import static jdk.nashorn.internal.tools.nasgen.StringConstants.GETTER_PREFIX;
 import static jdk.nashorn.internal.tools.nasgen.StringConstants.GET_CLASS_NAME;
 import static jdk.nashorn.internal.tools.nasgen.StringConstants.GET_CLASS_NAME_DESC;
 import static jdk.nashorn.internal.tools.nasgen.StringConstants.INIT;
-import static jdk.nashorn.internal.tools.nasgen.StringConstants.LOOKUP_NEWPROPERTY;
-import static jdk.nashorn.internal.tools.nasgen.StringConstants.LOOKUP_NEWPROPERTY_DESC;
-import static jdk.nashorn.internal.tools.nasgen.StringConstants.LOOKUP_TYPE;
-import static jdk.nashorn.internal.tools.nasgen.StringConstants.MAP_DESC;
-import static jdk.nashorn.internal.tools.nasgen.StringConstants.MAP_FIELD_NAME;
-import static jdk.nashorn.internal.tools.nasgen.StringConstants.MAP_NEWMAP;
-import static jdk.nashorn.internal.tools.nasgen.StringConstants.MAP_NEWMAP_DESC;
-import static jdk.nashorn.internal.tools.nasgen.StringConstants.MAP_TYPE;
+import static jdk.nashorn.internal.tools.nasgen.StringConstants.ACCESSORPROPERTY_CREATE;
+import static jdk.nashorn.internal.tools.nasgen.StringConstants.ACCESSORPROPERTY_CREATE_DESC;
+import static jdk.nashorn.internal.tools.nasgen.StringConstants.ACCESSORPROPERTY_TYPE;
+import static jdk.nashorn.internal.tools.nasgen.StringConstants.LIST_DESC;
+import static jdk.nashorn.internal.tools.nasgen.StringConstants.ARRAYLIST_TYPE;
+import static jdk.nashorn.internal.tools.nasgen.StringConstants.ARRAYLIST_INIT_DESC;
+import static jdk.nashorn.internal.tools.nasgen.StringConstants.COLLECTION_TYPE;
+import static jdk.nashorn.internal.tools.nasgen.StringConstants.COLLECTION_ADD;
+import static jdk.nashorn.internal.tools.nasgen.StringConstants.COLLECTION_ADD_DESC;
+import static jdk.nashorn.internal.tools.nasgen.StringConstants.COLLECTIONS_TYPE;
+import static jdk.nashorn.internal.tools.nasgen.StringConstants.COLLECTIONS_EMPTY_LIST;
+import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROPERTYMAP_DESC;
+import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROPERTYMAP_FIELD_NAME;
+import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROPERTYMAP_SETISSHARED;
+import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROPERTYMAP_SETISSHARED_DESC;
+import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROPERTYMAP_NEWMAP;
+import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROPERTYMAP_NEWMAP_DESC;
+import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROPERTYMAP_TYPE;
 import static jdk.nashorn.internal.tools.nasgen.StringConstants.OBJECT_DESC;
 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTFUNCTIONIMPL_MAKEFUNCTION;
 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTFUNCTIONIMPL_MAKEFUNCTION_DESC;
@@ -161,17 +171,30 @@ public class ClassGenerator {
         return new MethodGenerator(mv, access, name, desc);
     }
 
-    static void emitStaticInitPrefix(final MethodGenerator mi, final String className) {
+    static void emitStaticInitPrefix(final MethodGenerator mi, final String className, final int memberCount) {
         mi.visitCode();
-        mi.pushNull();
-        mi.putStatic(className, MAP_FIELD_NAME, MAP_DESC);
-        mi.invokeStatic(MAP_TYPE, MAP_NEWMAP, MAP_NEWMAP_DESC);
-        // stack: PropertyMap
+        if (memberCount > 0) {
+            // new ArrayList(int)
+            mi.newObject(ARRAYLIST_TYPE);
+            mi.dup();
+            mi.push(memberCount);
+            mi.invokeSpecial(ARRAYLIST_TYPE, INIT, ARRAYLIST_INIT_DESC);
+            // stack: ArrayList
+        } else {
+            // java.util.Collections.EMPTY_LIST
+            mi.getStatic(COLLECTIONS_TYPE, COLLECTIONS_EMPTY_LIST, LIST_DESC);
+            // stack List
+        }
     }
 
     static void emitStaticInitSuffix(final MethodGenerator mi, final String className) {
-        // stack: PropertyMap
-        mi.putStatic(className, MAP_FIELD_NAME, MAP_DESC);
+        // stack: Collection
+        // pmap = PropertyMap.newMap(Collection<Property>);
+        mi.invokeStatic(PROPERTYMAP_TYPE, PROPERTYMAP_NEWMAP, PROPERTYMAP_NEWMAP_DESC);
+        // pmap.setIsShared();
+        mi.invokeVirtual(PROPERTYMAP_TYPE, PROPERTYMAP_SETISSHARED, PROPERTYMAP_SETISSHARED_DESC);
+        // $nasgenmap$ = pmap;
+        mi.putStatic(className, PROPERTYMAP_FIELD_NAME, PROPERTYMAP_DESC);
         mi.returnVoid();
         mi.computeMaxs();
         mi.visitEnd();
@@ -235,9 +258,9 @@ public class ClassGenerator {
     }
 
     static void addMapField(final ClassVisitor cv) {
-        // add a MAP static field
+        // add a PropertyMap static field
         final FieldVisitor fv = cv.visitField(ACC_PRIVATE | ACC_STATIC | ACC_FINAL,
-            MAP_FIELD_NAME, MAP_DESC, null, null);
+            PROPERTYMAP_FIELD_NAME, PROPERTYMAP_DESC, null, null);
         if (fv != null) {
             fv.visitEnd();
         }
@@ -278,7 +301,11 @@ public class ClassGenerator {
 
     static void linkerAddGetterSetter(final MethodGenerator mi, final String className, final MemberInfo memInfo) {
         final String propertyName = memInfo.getName();
-        // stack: PropertyMap
+        // stack: Collection
+        // dup of Collection instance
+        mi.dup();
+
+        // property = AccessorProperty.create(key, flags, getter, setter);
         mi.loadLiteral(propertyName);
         // setup flags
         mi.push(memInfo.getAttributes());
@@ -292,13 +319,21 @@ public class ClassGenerator {
             javaName = SETTER_PREFIX + memInfo.getJavaName();
             mi.visitLdcInsn(new Handle(H_INVOKEVIRTUAL, className, javaName, setterDesc(memInfo)));
         }
-        mi.invokeStatic(LOOKUP_TYPE, LOOKUP_NEWPROPERTY, LOOKUP_NEWPROPERTY_DESC);
-        // stack: PropertyMap
+        mi.invokeStatic(ACCESSORPROPERTY_TYPE, ACCESSORPROPERTY_CREATE, ACCESSORPROPERTY_CREATE_DESC);
+        // boolean Collection.add(property)
+        mi.invokeInterface(COLLECTION_TYPE, COLLECTION_ADD, COLLECTION_ADD_DESC);
+        // pop return value of Collection.add
+        mi.pop();
+        // stack: Collection
     }
 
     static void linkerAddGetterSetter(final MethodGenerator mi, final String className, final MemberInfo getter, final MemberInfo setter) {
         final String propertyName = getter.getName();
-        // stack: PropertyMap
+        // stack: Collection
+        // dup of Collection instance
+        mi.dup();
+
+        // property = AccessorProperty.create(key, flags, getter, setter);
         mi.loadLiteral(propertyName);
         // setup flags
         mi.push(getter.getAttributes());
@@ -312,8 +347,12 @@ public class ClassGenerator {
             mi.visitLdcInsn(new Handle(H_INVOKESTATIC, className,
                     setter.getJavaName(), setter.getJavaDesc()));
         }
-        mi.invokeStatic(LOOKUP_TYPE, LOOKUP_NEWPROPERTY, LOOKUP_NEWPROPERTY_DESC);
-        // stack: PropertyMap
+        mi.invokeStatic(ACCESSORPROPERTY_TYPE, ACCESSORPROPERTY_CREATE, ACCESSORPROPERTY_CREATE_DESC);
+        // boolean Collection.add(property)
+        mi.invokeInterface(COLLECTION_TYPE, COLLECTION_ADD, COLLECTION_ADD_DESC);
+        // pop return value of Collection.add
+        mi.pop();
+        // stack: Collection
     }
 
     static ScriptClassInfo getScriptClassInfo(final String fileName) throws IOException {
diff --git a/buildtools/nasgen/src/jdk/nashorn/internal/tools/nasgen/ConstructorGenerator.java b/buildtools/nasgen/src/jdk/nashorn/internal/tools/nasgen/ConstructorGenerator.java
index 7c59f8c3..e90b53ec 100644
--- a/buildtools/nasgen/src/jdk/nashorn/internal/tools/nasgen/ConstructorGenerator.java
+++ b/buildtools/nasgen/src/jdk/nashorn/internal/tools/nasgen/ConstructorGenerator.java
@@ -32,11 +32,11 @@ import static jdk.internal.org.objectweb.asm.Opcodes.V1_7;
 import static jdk.nashorn.internal.tools.nasgen.StringConstants.CONSTRUCTOR_SUFFIX;
 import static jdk.nashorn.internal.tools.nasgen.StringConstants.DEFAULT_INIT_DESC;
 import static jdk.nashorn.internal.tools.nasgen.StringConstants.INIT;
-import static jdk.nashorn.internal.tools.nasgen.StringConstants.MAP_DESC;
-import static jdk.nashorn.internal.tools.nasgen.StringConstants.MAP_DUPLICATE;
-import static jdk.nashorn.internal.tools.nasgen.StringConstants.MAP_DUPLICATE_DESC;
-import static jdk.nashorn.internal.tools.nasgen.StringConstants.MAP_FIELD_NAME;
-import static jdk.nashorn.internal.tools.nasgen.StringConstants.MAP_TYPE;
+import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROPERTYMAP_DESC;
+import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROPERTYMAP_DUPLICATE;
+import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROPERTYMAP_DUPLICATE_DESC;
+import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROPERTYMAP_FIELD_NAME;
+import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROPERTYMAP_TYPE;
 import static jdk.nashorn.internal.tools.nasgen.StringConstants.OBJECT_DESC;
 import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROTOTYPEOBJECT_SETCONSTRUCTOR;
 import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROTOTYPEOBJECT_SETCONSTRUCTOR_DESC;
@@ -129,7 +129,7 @@ public class ConstructorGenerator extends ClassGenerator {
 
     private void emitStaticInitializer() {
         final MethodGenerator mi = makeStaticInitializer();
-        emitStaticInitPrefix(mi, className);
+        emitStaticInitPrefix(mi, className, memberCount);
 
         for (final MemberInfo memInfo : scriptClassInfo.getMembers()) {
             if (memInfo.isConstructorFunction() || memInfo.isConstructorProperty()) {
@@ -170,10 +170,10 @@ public class ConstructorGenerator extends ClassGenerator {
 
     private void loadMap(final MethodGenerator mi) {
         if (memberCount > 0) {
-            mi.getStatic(className, MAP_FIELD_NAME, MAP_DESC);
+            mi.getStatic(className, PROPERTYMAP_FIELD_NAME, PROPERTYMAP_DESC);
             // make sure we use duplicated PropertyMap so that original map
-            // stays intact and so can be used for many globals in same context
-            mi.invokeVirtual(MAP_TYPE, MAP_DUPLICATE, MAP_DUPLICATE_DESC);
+            // stays intact and so can be used for many globals.
+            mi.invokeVirtual(PROPERTYMAP_TYPE, PROPERTYMAP_DUPLICATE, PROPERTYMAP_DUPLICATE_DESC);
         }
     }
 
diff --git a/buildtools/nasgen/src/jdk/nashorn/internal/tools/nasgen/MethodGenerator.java b/buildtools/nasgen/src/jdk/nashorn/internal/tools/nasgen/MethodGenerator.java
index c3dfd878..475d7328 100644
--- a/buildtools/nasgen/src/jdk/nashorn/internal/tools/nasgen/MethodGenerator.java
+++ b/buildtools/nasgen/src/jdk/nashorn/internal/tools/nasgen/MethodGenerator.java
@@ -57,6 +57,7 @@ import static jdk.internal.org.objectweb.asm.Opcodes.IALOAD;
 import static jdk.internal.org.objectweb.asm.Opcodes.IASTORE;
 import static jdk.internal.org.objectweb.asm.Opcodes.ICONST_0;
 import static jdk.internal.org.objectweb.asm.Opcodes.ILOAD;
+import static jdk.internal.org.objectweb.asm.Opcodes.INVOKEINTERFACE;
 import static jdk.internal.org.objectweb.asm.Opcodes.INVOKESPECIAL;
 import static jdk.internal.org.objectweb.asm.Opcodes.INVOKESTATIC;
 import static jdk.internal.org.objectweb.asm.Opcodes.INVOKEVIRTUAL;
@@ -347,6 +348,10 @@ public class MethodGenerator extends MethodVisitor {
     }
 
     // invokes, field get/sets
+    void invokeInterface(final String owner, final String method, final String desc) {
+        super.visitMethodInsn(INVOKEINTERFACE, owner, method, desc);
+    }
+
     void invokeVirtual(final String owner, final String method, final String desc) {
         super.visitMethodInsn(INVOKEVIRTUAL, owner, method, desc);
     }
diff --git a/buildtools/nasgen/src/jdk/nashorn/internal/tools/nasgen/PrototypeGenerator.java b/buildtools/nasgen/src/jdk/nashorn/internal/tools/nasgen/PrototypeGenerator.java
index 17750cd1..98048a29 100644
--- a/buildtools/nasgen/src/jdk/nashorn/internal/tools/nasgen/PrototypeGenerator.java
+++ b/buildtools/nasgen/src/jdk/nashorn/internal/tools/nasgen/PrototypeGenerator.java
@@ -30,11 +30,11 @@ import static jdk.internal.org.objectweb.asm.Opcodes.ACC_SUPER;
 import static jdk.internal.org.objectweb.asm.Opcodes.V1_7;
 import static jdk.nashorn.internal.tools.nasgen.StringConstants.DEFAULT_INIT_DESC;
 import static jdk.nashorn.internal.tools.nasgen.StringConstants.INIT;
-import static jdk.nashorn.internal.tools.nasgen.StringConstants.MAP_DESC;
-import static jdk.nashorn.internal.tools.nasgen.StringConstants.MAP_DUPLICATE;
-import static jdk.nashorn.internal.tools.nasgen.StringConstants.MAP_DUPLICATE_DESC;
-import static jdk.nashorn.internal.tools.nasgen.StringConstants.MAP_FIELD_NAME;
-import static jdk.nashorn.internal.tools.nasgen.StringConstants.MAP_TYPE;
+import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROPERTYMAP_DESC;
+import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROPERTYMAP_DUPLICATE;
+import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROPERTYMAP_DUPLICATE_DESC;
+import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROPERTYMAP_FIELD_NAME;
+import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROPERTYMAP_TYPE;
 import static jdk.nashorn.internal.tools.nasgen.StringConstants.OBJECT_DESC;
 import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROTOTYPEOBJECT_TYPE;
 import static jdk.nashorn.internal.tools.nasgen.StringConstants.PROTOTYPE_SUFFIX;
@@ -67,6 +67,7 @@ public class PrototypeGenerator extends ClassGenerator {
             // add <clinit>
             emitStaticInitializer();
         }
+
         // add <init>
         emitConstructor();
 
@@ -106,7 +107,7 @@ public class PrototypeGenerator extends ClassGenerator {
 
     private void emitStaticInitializer() {
         final MethodGenerator mi = makeStaticInitializer();
-        emitStaticInitPrefix(mi, className);
+        emitStaticInitPrefix(mi, className, memberCount);
         for (final MemberInfo memInfo : scriptClassInfo.getMembers()) {
             if (memInfo.isPrototypeFunction() || memInfo.isPrototypeProperty()) {
                 linkerAddGetterSetter(mi, className, memInfo);
@@ -124,10 +125,10 @@ public class PrototypeGenerator extends ClassGenerator {
         mi.loadThis();
         if (memberCount > 0) {
             // call "super(map$)"
-            mi.getStatic(className, MAP_FIELD_NAME, MAP_DESC);
+            mi.getStatic(className, PROPERTYMAP_FIELD_NAME, PROPERTYMAP_DESC);
             // make sure we use duplicated PropertyMap so that original map
-            // stays intact and so can be used for many globals in same context
-            mi.invokeVirtual(MAP_TYPE, MAP_DUPLICATE, MAP_DUPLICATE_DESC);
+            // stays intact and so can be used for many global.
+            mi.invokeVirtual(PROPERTYMAP_TYPE, PROPERTYMAP_DUPLICATE, PROPERTYMAP_DUPLICATE_DESC);
             mi.invokeSpecial(PROTOTYPEOBJECT_TYPE, INIT, SCRIPTOBJECT_INIT_DESC);
             // initialize Function type fields
             initFunctionFields(mi);
diff --git a/buildtools/nasgen/src/jdk/nashorn/internal/tools/nasgen/ScriptClassInstrumentor.java b/buildtools/nasgen/src/jdk/nashorn/internal/tools/nasgen/ScriptClassInstrumentor.java
index ffeb90be..1622e02b 100644
--- a/buildtools/nasgen/src/jdk/nashorn/internal/tools/nasgen/ScriptClassInstrumentor.java
+++ b/buildtools/nasgen/src/jdk/nashorn/internal/tools/nasgen/ScriptClassInstrumentor.java
@@ -37,10 +37,7 @@ import static jdk.nashorn.internal.tools.nasgen.StringConstants.$CLINIT$;
 import static jdk.nashorn.internal.tools.nasgen.StringConstants.CLINIT;
 import static jdk.nashorn.internal.tools.nasgen.StringConstants.DEFAULT_INIT_DESC;
 import static jdk.nashorn.internal.tools.nasgen.StringConstants.INIT;
-import static jdk.nashorn.internal.tools.nasgen.StringConstants.MAP_DESC;
-import static jdk.nashorn.internal.tools.nasgen.StringConstants.MAP_FIELD_NAME;
 import static jdk.nashorn.internal.tools.nasgen.StringConstants.OBJECT_DESC;
-import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTOBJECT_INIT_DESC;
 import static jdk.nashorn.internal.tools.nasgen.StringConstants.SCRIPTOBJECT_TYPE;
 
 import java.io.BufferedInputStream;
@@ -159,14 +156,7 @@ public class ScriptClassInstrumentor extends ClassVisitor {
             public void visitMethodInsn(final int opcode, final String owner, final String name, final String desc) {
                 if (isConstructor && opcode == INVOKESPECIAL &&
                         INIT.equals(name) && SCRIPTOBJECT_TYPE.equals(owner)) {
-
-                    // replace call to empty super-constructor with one passing PropertyMap argument
-                    if (DEFAULT_INIT_DESC.equals(desc)) {
-                        super.visitFieldInsn(GETSTATIC, scriptClassInfo.getJavaName(), MAP_FIELD_NAME, MAP_DESC);
-                        super.visitMethodInsn(INVOKESPECIAL, SCRIPTOBJECT_TYPE, INIT, SCRIPTOBJECT_INIT_DESC);
-                    } else {
-                        super.visitMethodInsn(opcode, owner, name, desc);
-                    }
+                    super.visitMethodInsn(opcode, owner, name, desc);
 
                     if (memberCount > 0) {
                         // initialize @Property fields if needed
@@ -256,7 +246,7 @@ public class ScriptClassInstrumentor extends ClassVisitor {
         }
         // Now generate $clinit$
         final MethodGenerator mi = ClassGenerator.makeStaticInitializer(this, $CLINIT$);
-        ClassGenerator.emitStaticInitPrefix(mi, className);
+        ClassGenerator.emitStaticInitPrefix(mi, className, memberCount);
         if (memberCount > 0) {
             for (final MemberInfo memInfo : scriptClassInfo.getMembers()) {
                 if (memInfo.isInstanceProperty() || memInfo.isInstanceFunction()) {
diff --git a/buildtools/nasgen/src/jdk/nashorn/internal/tools/nasgen/StringConstants.java b/buildtools/nasgen/src/jdk/nashorn/internal/tools/nasgen/StringConstants.java
index d0e3168b..c4c1ab8d 100644
--- a/buildtools/nasgen/src/jdk/nashorn/internal/tools/nasgen/StringConstants.java
+++ b/buildtools/nasgen/src/jdk/nashorn/internal/tools/nasgen/StringConstants.java
@@ -27,10 +27,14 @@ package jdk.nashorn.internal.tools.nasgen;
 
 import java.lang.invoke.MethodHandle;
 import java.lang.reflect.Method;
+import java.util.Collection;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
 import jdk.internal.org.objectweb.asm.Type;
-import jdk.nashorn.internal.lookup.Lookup;
 import jdk.nashorn.internal.objects.PrototypeObject;
 import jdk.nashorn.internal.objects.ScriptFunctionImpl;
+import jdk.nashorn.internal.runtime.AccessorProperty;
 import jdk.nashorn.internal.runtime.PropertyMap;
 import jdk.nashorn.internal.runtime.ScriptFunction;
 import jdk.nashorn.internal.runtime.ScriptObject;
@@ -40,15 +44,41 @@ import jdk.nashorn.internal.runtime.ScriptObject;
  */
 @SuppressWarnings("javadoc")
 public interface StringConstants {
+    // standard jdk types, methods
     static final Type TYPE_METHOD             = Type.getType(Method.class);
     static final Type TYPE_METHODHANDLE       = Type.getType(MethodHandle.class);
     static final Type TYPE_METHODHANDLE_ARRAY = Type.getType(MethodHandle[].class);
     static final Type TYPE_OBJECT             = Type.getType(Object.class);
     static final Type TYPE_CLASS              = Type.getType(Class.class);
     static final Type TYPE_STRING             = Type.getType(String.class);
+    static final Type TYPE_COLLECTION         = Type.getType(Collection.class);
+    static final Type TYPE_COLLECTIONS        = Type.getType(Collections.class);
+    static final Type TYPE_ARRAYLIST          = Type.getType(ArrayList.class);
+    static final Type TYPE_LIST               = Type.getType(List.class);
 
-    // Nashorn types
-    static final Type TYPE_LOOKUP             = Type.getType(Lookup.class);
+    static final String CLINIT = "<clinit>";
+    static final String INIT = "<init>";
+    static final String DEFAULT_INIT_DESC = Type.getMethodDescriptor(Type.VOID_TYPE);
+
+    static final String METHODHANDLE_TYPE = TYPE_METHODHANDLE.getInternalName();
+    static final String OBJECT_TYPE = TYPE_OBJECT.getInternalName();
+    static final String OBJECT_DESC = TYPE_OBJECT.getDescriptor();
+    static final String OBJECT_ARRAY_DESC = Type.getDescriptor(Object[].class);
+    static final String ARRAYLIST_TYPE = TYPE_ARRAYLIST.getInternalName();
+    static final String COLLECTION_TYPE = TYPE_COLLECTION.getInternalName();
+    static final String COLLECTIONS_TYPE = TYPE_COLLECTIONS.getInternalName();
+
+    // java.util.Collection.add(Object)
+    static final String COLLECTION_ADD = "add";
+    static final String COLLECTION_ADD_DESC = Type.getMethodDescriptor(Type.BOOLEAN_TYPE, TYPE_OBJECT);
+    // java.util.ArrayList.<init>(int)
+    static final String ARRAYLIST_INIT_DESC = Type.getMethodDescriptor(Type.VOID_TYPE, Type.INT_TYPE);
+    // java.util.Collections.EMPTY_LIST
+    static final String COLLECTIONS_EMPTY_LIST = "EMPTY_LIST";
+    static final String LIST_DESC = TYPE_LIST.getDescriptor();
+
+    // Nashorn types, methods
+    static final Type TYPE_ACCESSORPROPERTY   = Type.getType(AccessorProperty.class);
     static final Type TYPE_PROPERTYMAP        = Type.getType(PropertyMap.class);
     static final Type TYPE_PROTOTYPEOBJECT    = Type.getType(PrototypeObject.class);
     static final Type TYPE_SCRIPTFUNCTION     = Type.getType(ScriptFunction.class);
@@ -57,52 +87,56 @@ public interface StringConstants {
 
     static final String PROTOTYPE_SUFFIX = "$Prototype";
     static final String CONSTRUCTOR_SUFFIX = "$Constructor";
+
     // This field name is known to Nashorn runtime (Context).
     // Synchronize the name change, if needed at all.
-    static final String MAP_FIELD_NAME = "$nasgenmap$";
+    static final String PROPERTYMAP_FIELD_NAME = "$nasgenmap$";
     static final String $CLINIT$ = "$clinit$";
-    static final String CLINIT = "<clinit>";
-    static final String INIT = "<init>";
-    static final String DEFAULT_INIT_DESC = Type.getMethodDescriptor(Type.VOID_TYPE);
 
-    static final String SCRIPTOBJECT_INIT_DESC = Type.getMethodDescriptor(Type.VOID_TYPE, TYPE_PROPERTYMAP);
+    // AccessorProperty
+    static final String ACCESSORPROPERTY_TYPE = TYPE_ACCESSORPROPERTY.getInternalName();
+    static final String ACCESSORPROPERTY_CREATE = "create";
+    static final String ACCESSORPROPERTY_CREATE_DESC =
+        Type.getMethodDescriptor(TYPE_ACCESSORPROPERTY, TYPE_STRING, Type.INT_TYPE, TYPE_METHODHANDLE, TYPE_METHODHANDLE);
 
-    static final String METHODHANDLE_TYPE = TYPE_METHODHANDLE.getInternalName();
+    // PropertyMap
+    static final String PROPERTYMAP_TYPE = TYPE_PROPERTYMAP.getInternalName();
+    static final String PROPERTYMAP_DESC = TYPE_PROPERTYMAP.getDescriptor();
+    static final String PROPERTYMAP_NEWMAP = "newMap";
+    static final String PROPERTYMAP_NEWMAP_DESC = Type.getMethodDescriptor(TYPE_PROPERTYMAP, TYPE_COLLECTION);
+    static final String PROPERTYMAP_DUPLICATE = "duplicate";
+    static final String PROPERTYMAP_DUPLICATE_DESC = Type.getMethodDescriptor(TYPE_PROPERTYMAP);
+    static final String PROPERTYMAP_SETISSHARED = "setIsShared";
+    static final String PROPERTYMAP_SETISSHARED_DESC = Type.getMethodDescriptor(TYPE_PROPERTYMAP);
 
-    static final String OBJECT_TYPE = TYPE_OBJECT.getInternalName();
-    static final String OBJECT_DESC = TYPE_OBJECT.getDescriptor();
-    static final String OBJECT_ARRAY_DESC = Type.getDescriptor(Object[].class);
+    // PrototypeObject
+    static final String PROTOTYPEOBJECT_TYPE = TYPE_PROTOTYPEOBJECT.getInternalName();
+    static final String PROTOTYPEOBJECT_SETCONSTRUCTOR = "setConstructor";
+    static final String PROTOTYPEOBJECT_SETCONSTRUCTOR_DESC = Type.getMethodDescriptor(Type.VOID_TYPE, TYPE_OBJECT, TYPE_OBJECT);
 
+    // ScriptFunction
     static final String SCRIPTFUNCTION_TYPE = TYPE_SCRIPTFUNCTION.getInternalName();
+    static final String SCRIPTFUNCTION_SETARITY = "setArity";
+    static final String SCRIPTFUNCTION_SETARITY_DESC = Type.getMethodDescriptor(Type.VOID_TYPE, Type.INT_TYPE);
+    static final String SCRIPTFUNCTION_SETPROTOTYPE = "setPrototype";
+    static final String SCRIPTFUNCTION_SETPROTOTYPE_DESC = Type.getMethodDescriptor(Type.VOID_TYPE, TYPE_OBJECT);
+
+    // ScriptFunctionImpl
     static final String SCRIPTFUNCTIONIMPL_TYPE = TYPE_SCRIPTFUNCTIONIMPL.getInternalName();
     static final String SCRIPTFUNCTIONIMPL_MAKEFUNCTION = "makeFunction";
     static final String SCRIPTFUNCTIONIMPL_MAKEFUNCTION_DESC =
         Type.getMethodDescriptor(TYPE_SCRIPTFUNCTION, TYPE_STRING, TYPE_METHODHANDLE);
     static final String SCRIPTFUNCTIONIMPL_MAKEFUNCTION_SPECS_DESC =
         Type.getMethodDescriptor(TYPE_SCRIPTFUNCTION, TYPE_STRING, TYPE_METHODHANDLE, TYPE_METHODHANDLE_ARRAY);
-
     static final String SCRIPTFUNCTIONIMPL_INIT_DESC3 =
         Type.getMethodDescriptor(Type.VOID_TYPE, TYPE_STRING, TYPE_METHODHANDLE, TYPE_METHODHANDLE_ARRAY);
     static final String SCRIPTFUNCTIONIMPL_INIT_DESC4 =
         Type.getMethodDescriptor(Type.VOID_TYPE, TYPE_STRING, TYPE_METHODHANDLE, TYPE_PROPERTYMAP, TYPE_METHODHANDLE_ARRAY);
-    static final String SCRIPTFUNCTION_SETARITY = "setArity";
-    static final String SCRIPTFUNCTION_SETARITY_DESC = Type.getMethodDescriptor(Type.VOID_TYPE, Type.INT_TYPE);
-    static final String SCRIPTFUNCTION_SETPROTOTYPE = "setPrototype";
-    static final String SCRIPTFUNCTION_SETPROTOTYPE_DESC = Type.getMethodDescriptor(Type.VOID_TYPE, TYPE_OBJECT);
-    static final String PROTOTYPEOBJECT_TYPE = TYPE_PROTOTYPEOBJECT.getInternalName();
-    static final String PROTOTYPEOBJECT_SETCONSTRUCTOR = "setConstructor";
-    static final String PROTOTYPEOBJECT_SETCONSTRUCTOR_DESC = Type.getMethodDescriptor(Type.VOID_TYPE, TYPE_OBJECT, TYPE_OBJECT);
+
+    // ScriptObject
     static final String SCRIPTOBJECT_TYPE = TYPE_SCRIPTOBJECT.getInternalName();
-    static final String MAP_TYPE = TYPE_PROPERTYMAP.getInternalName();
-    static final String MAP_DESC = TYPE_PROPERTYMAP.getDescriptor();
-    static final String MAP_NEWMAP = "newMap";
-    static final String MAP_NEWMAP_DESC = Type.getMethodDescriptor(TYPE_PROPERTYMAP);
-    static final String MAP_DUPLICATE = "duplicate";
-    static final String MAP_DUPLICATE_DESC = Type.getMethodDescriptor(TYPE_PROPERTYMAP);
-    static final String LOOKUP_TYPE = TYPE_LOOKUP.getInternalName();
-    static final String LOOKUP_NEWPROPERTY = "newProperty";
-    static final String LOOKUP_NEWPROPERTY_DESC =
-        Type.getMethodDescriptor(TYPE_PROPERTYMAP, TYPE_PROPERTYMAP, TYPE_STRING, Type.INT_TYPE, TYPE_METHODHANDLE, TYPE_METHODHANDLE);
+    static final String SCRIPTOBJECT_INIT_DESC = Type.getMethodDescriptor(Type.VOID_TYPE, TYPE_PROPERTYMAP);
+
     static final String GETTER_PREFIX = "G$";
     static final String SETTER_PREFIX = "S$";
 
diff --git a/make/code_coverage.xml b/make/code_coverage.xml
index 3e2860f8..dea03099 100644
--- a/make/code_coverage.xml
+++ b/make/code_coverage.xml
@@ -60,16 +60,8 @@
     <copy todir="${build.dir}/to_be_instrumented">
       <fileset dir="${build.classes.dir}">
         <include name="**/*.class"/>
-        <include name="**/*.clazz"/>
       </fileset>
     </copy>
-
-    <move todir="${build.dir}/to_be_instrumented/jdk/nashorn/internal/objects">
-      <fileset dir="${build.dir}/to_be_instrumented/jdk/nashorn/internal/objects">
-        <include name="**/*.clazz"/>
-      </fileset>
-      <mapper type="glob" from="*.clazz" to="*.class"/>
-    </move>
   </target>
 
   <target name="generate-cc-template" depends="prepare-to-be-instrumented" description="Generates code coverage template for dynamic CC" if="cc.generate.template">
diff --git a/make/project.properties b/make/project.properties
index 66bbdbeb..dbd9efce 100644
--- a/make/project.properties
+++ b/make/project.properties
@@ -200,6 +200,9 @@ test262-test-sys-prop.test.failed.list.file=${build.dir}/test/failedTests
 
 # test262 test frameworks
 test262-test-sys-prop.test.js.framework=\
+    --class-cache-size=0 \
+    --no-java \
+    --no-typed-arrays \
     -timezone=PST \
     ${test.script.dir}/test262.js \
     ${test262.dir}/test/harness/framework.js \
diff --git a/src/jdk/nashorn/internal/lookup/Lookup.java b/src/jdk/nashorn/internal/lookup/Lookup.java
index a454527a..e874cfd7 100644
--- a/src/jdk/nashorn/internal/lookup/Lookup.java
+++ b/src/jdk/nashorn/internal/lookup/Lookup.java
@@ -125,44 +125,6 @@ public final class Lookup {
     }
 
     /**
-     * Create a new {@link Property}
-     *
-     * @param map             property map
-     * @param key             property key
-     * @param flags           property flags
-     * @param propertyGetter  getter for property if available, null otherwise
-     * @param propertySetter  setter for property if available, null otherwise
-     *
-     * @return new property map, representing {@code PropertyMap} with the new property added to it
-     */
-    @SuppressWarnings("fallthrough")
-    public static PropertyMap newProperty(final PropertyMap map, final String key, final int flags, final MethodHandle propertyGetter, final MethodHandle propertySetter) {
-        MethodHandle getter = propertyGetter;
-        MethodHandle setter = propertySetter;
-
-        // TODO: this is temporary code. This code exists to support reflective
-        // field reader/writer handles generated by "unreflect" lookup.
-
-        switch (getter.type().parameterCount()) {
-        case 0:
-            // A static field reader, so drop the 'self' argument.
-            getter = MH.dropArguments(getter, 0, Object.class);
-            if (setter != null) {
-                setter = MH.dropArguments(setter, 0, Object.class);
-            }
-        // fall through
-        case 1:
-            // standard getter that accepts 'self'.
-            break;
-        default:
-            // Huh!! something wrong..
-            throw new IllegalArgumentException("getter/setter has wrong arguments");
-        }
-
-        return map.newProperty(key, flags, -1, getter, setter);
-    }
-
-    /**
      * This method filters primitive return types using JavaScript semantics. For example,
      * an (int) cast of a double in Java land is not the same thing as invoking toInt32 on it.
      * If you are returning values to JavaScript that have to be of a specific type, this is
diff --git a/src/jdk/nashorn/internal/objects/ArrayBufferView.java b/src/jdk/nashorn/internal/objects/ArrayBufferView.java
index 60da65a1..73969fa5 100644
--- a/src/jdk/nashorn/internal/objects/ArrayBufferView.java
+++ b/src/jdk/nashorn/internal/objects/ArrayBufferView.java
@@ -46,14 +46,17 @@ abstract class ArrayBufferView extends ScriptObject {
         return $nasgenmap$;
     }
 
-    ArrayBufferView(final NativeArrayBuffer buffer, final int byteOffset, final int elementLength) {
+    private ArrayBufferView(final NativeArrayBuffer buffer, final int byteOffset, final int elementLength, final Global global) {
+        super(global.getArrayBufferViewMap());
         checkConstructorArgs(buffer, byteOffset, elementLength);
-        final Global global = Global.instance();
-        this.setMap(global.getArrayBufferViewMap());
         this.setProto(getPrototype(global));
         this.setArray(factory().createArrayData(buffer, byteOffset, elementLength));
     }
 
+    ArrayBufferView(final NativeArrayBuffer buffer, final int byteOffset, final int elementLength) {
+        this(buffer, byteOffset, elementLength, Global.instance());
+    }
+
     private void checkConstructorArgs(final NativeArrayBuffer buffer, final int byteOffset, final int elementLength) {
         if (byteOffset < 0 || elementLength < 0) {
             throw new RuntimeException("byteOffset or length must not be negative");
diff --git a/src/jdk/nashorn/internal/objects/Global.java b/src/jdk/nashorn/internal/objects/Global.java
index a92de8e1..e54fbb45 100644
--- a/src/jdk/nashorn/internal/objects/Global.java
+++ b/src/jdk/nashorn/internal/objects/Global.java
@@ -43,7 +43,6 @@ import java.util.List;
 import java.util.Map;
 import jdk.internal.dynalink.linker.GuardedInvocation;
 import jdk.internal.dynalink.linker.LinkRequest;
-import jdk.nashorn.internal.lookup.MethodHandleFactory;
 import jdk.nashorn.internal.objects.annotations.Attribute;
 import jdk.nashorn.internal.objects.annotations.Property;
 import jdk.nashorn.internal.objects.annotations.ScriptClass;
@@ -389,6 +388,7 @@ public final class Global extends ScriptObject implements GlobalObject, Scope {
     private PropertyMap    prototypeObjectMap;
     private PropertyMap    objectMap;
     private PropertyMap    functionMap;
+    private PropertyMap    anonymousFunctionMap;
     private PropertyMap    strictFunctionMap;
     private PropertyMap    boundFunctionMap;
 
@@ -409,7 +409,6 @@ public final class Global extends ScriptObject implements GlobalObject, Scope {
     private static final MethodHandle EXIT              = findOwnMH("exit",              Object.class, Object.class, Object.class);
 
     // initialized by nasgen
-    @SuppressWarnings("unused")
     private static PropertyMap $nasgenmap$;
 
     /**
@@ -418,14 +417,14 @@ public final class Global extends ScriptObject implements GlobalObject, Scope {
      * @param context the context
      */
     public Global(final Context context) {
-        this.setContext(context);
-        this.setIsScope();
         /*
          * Duplicate global's map and use it. This way the initial Map filled
          * by nasgen (referenced from static field in this class) is retained
-         * 'as is'. This allows multiple globals to be used within a context.
+         * 'as is' (as that one is process wide singleton.
          */
-        this.setMap(getMap().duplicate());
+        super($nasgenmap$.duplicate());
+        this.setContext(context);
+        this.setIsScope();
 
         final int cacheSize = context.getEnv()._class_cache_size;
         if (cacheSize > 0) {
@@ -1018,6 +1017,10 @@ public final class Global extends ScriptObject implements GlobalObject, Scope {
         return functionMap;
     }
 
+    PropertyMap getAnonymousFunctionMap() {
+        return anonymousFunctionMap;
+    }
+
     PropertyMap getStrictFunctionMap() {
         return strictFunctionMap;
     }
@@ -1538,7 +1541,7 @@ public final class Global extends ScriptObject implements GlobalObject, Scope {
         final ScriptEnvironment env = getContext().getEnv();
 
         // duplicate PropertyMaps of Native* classes
-        copyInitialMaps();
+        copyInitialMaps(env);
 
         // initialize Function and Object constructor
         initFunctionAndObject();
@@ -1599,12 +1602,16 @@ public final class Global extends ScriptObject implements GlobalObject, Scope {
         initErrorObjects();
 
         // java access
-        initJavaAccess();
+        if (! env._no_java) {
+            initJavaAccess();
+        }
 
-        initTypedArray();
+        if (! env._no_typed_arrays) {
+            initTypedArray();
+        }
 
         if (env._scripting) {
-            initScripting();
+            initScripting(env);
         }
 
         if (Context.DEBUG && System.getSecurityManager() == null) {
@@ -1685,7 +1692,7 @@ public final class Global extends ScriptObject implements GlobalObject, Scope {
         this.builtinJavaApi = initConstructor("Java");
     }
 
-    private void initScripting() {
+    private void initScripting(final ScriptEnvironment scriptEnv) {
         Object value;
         value = ScriptFunctionImpl.makeFunction("readLine", ScriptingFunctions.READLINE);
         addOwnProperty("readLine", Attribute.NOT_ENUMERABLE, value);
@@ -1704,7 +1711,6 @@ public final class Global extends ScriptObject implements GlobalObject, Scope {
 
         // Nashorn extension: global.$OPTIONS (scripting-mode-only)
         final ScriptObject options = newObject();
-        final ScriptEnvironment scriptEnv = getContext().getEnv();
         copyOptions(options, scriptEnv);
         addOwnProperty("$OPTIONS", Attribute.NOT_ENUMERABLE, options);
 
@@ -1857,20 +1863,17 @@ public final class Global extends ScriptObject implements GlobalObject, Scope {
         }
     }
 
-    private void copyInitialMaps() {
+    private void copyInitialMaps(final ScriptEnvironment env) {
         this.accessorPropertyDescriptorMap = AccessorPropertyDescriptor.getInitialMap().duplicate();
-        this.arrayBufferViewMap = ArrayBufferView.getInitialMap().duplicate();
         this.dataPropertyDescriptorMap = DataPropertyDescriptor.getInitialMap().duplicate();
         this.genericPropertyDescriptorMap = GenericPropertyDescriptor.getInitialMap().duplicate();
         this.nativeArgumentsMap = NativeArguments.getInitialMap().duplicate();
         this.nativeArrayMap = NativeArray.getInitialMap().duplicate();
-        this.nativeArrayBufferMap = NativeArrayBuffer.getInitialMap().duplicate();
         this.nativeBooleanMap = NativeBoolean.getInitialMap().duplicate();
         this.nativeDateMap = NativeDate.getInitialMap().duplicate();
         this.nativeErrorMap = NativeError.getInitialMap().duplicate();
         this.nativeEvalErrorMap = NativeEvalError.getInitialMap().duplicate();
         this.nativeJSAdapterMap = NativeJSAdapter.getInitialMap().duplicate();
-        this.nativeJavaImporterMap = NativeJavaImporter.getInitialMap().duplicate();
         this.nativeNumberMap = NativeNumber.getInitialMap().duplicate();
         this.nativeRangeErrorMap = NativeRangeError.getInitialMap().duplicate();
         this.nativeReferenceErrorMap = NativeReferenceError.getInitialMap().duplicate();
@@ -1883,9 +1886,21 @@ public final class Global extends ScriptObject implements GlobalObject, Scope {
         this.nativeURIErrorMap = NativeURIError.getInitialMap().duplicate();
         this.prototypeObjectMap = PrototypeObject.getInitialMap().duplicate();
         this.objectMap = JO.getInitialMap().duplicate();
-        this.functionMap = ScriptFunctionImpl.getInitialMap();
+        this.functionMap = ScriptFunctionImpl.getInitialMap().duplicate();
+        this.anonymousFunctionMap = ScriptFunctionImpl.getInitialAnonymousMap().duplicate();
         this.strictFunctionMap = ScriptFunctionImpl.getInitialStrictMap().duplicate();
         this.boundFunctionMap = ScriptFunctionImpl.getInitialBoundMap().duplicate();
+
+        // java
+        if (! env._no_java) {
+            this.nativeJavaImporterMap = NativeJavaImporter.getInitialMap().duplicate();
+        }
+
+        // typed arrays
+        if (! env._no_typed_arrays) {
+            this.arrayBufferViewMap = ArrayBufferView.getInitialMap().duplicate();
+            this.nativeArrayBufferMap = NativeArrayBuffer.getInitialMap().duplicate();
+        }
     }
 
     // Function and Object constructors are inter-dependent. Also,
@@ -1899,7 +1914,7 @@ public final class Global extends ScriptObject implements GlobalObject, Scope {
         this.builtinFunction = (ScriptFunction)initConstructor("Function");
 
         // create global anonymous function
-        final ScriptFunction anon = ScriptFunctionImpl.newAnonymousFunction();
+        final ScriptFunction anon = ScriptFunctionImpl.newAnonymousFunction(this);
         // need to copy over members of Function.prototype to anon function
         anon.addBoundProperties(getFunctionPrototype());
 
diff --git a/src/jdk/nashorn/internal/objects/NativeArguments.java b/src/jdk/nashorn/internal/objects/NativeArguments.java
index 4a5b5986..3bd74d52 100644
--- a/src/jdk/nashorn/internal/objects/NativeArguments.java
+++ b/src/jdk/nashorn/internal/objects/NativeArguments.java
@@ -31,8 +31,10 @@ import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED;
 
 import java.lang.invoke.MethodHandle;
 import java.lang.invoke.MethodHandles;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.BitSet;
+import jdk.nashorn.internal.runtime.AccessorProperty;
 import jdk.nashorn.internal.runtime.Property;
 import jdk.nashorn.internal.runtime.PropertyDescriptor;
 import jdk.nashorn.internal.runtime.PropertyMap;
@@ -41,8 +43,6 @@ import jdk.nashorn.internal.runtime.ScriptObject;
 import jdk.nashorn.internal.runtime.ScriptRuntime;
 import jdk.nashorn.internal.runtime.arrays.ArrayData;
 import jdk.nashorn.internal.runtime.arrays.ArrayIndex;
-import jdk.nashorn.internal.lookup.Lookup;
-import jdk.nashorn.internal.lookup.MethodHandleFactory;
 
 /**
  * ECMA 10.6 Arguments Object.
@@ -64,10 +64,10 @@ public final class NativeArguments extends ScriptObject {
     private static final PropertyMap map$;
 
     static {
-        PropertyMap map = PropertyMap.newMap();
-        map = Lookup.newProperty(map, "length", Property.NOT_ENUMERABLE, G$LENGTH, S$LENGTH);
-        map = Lookup.newProperty(map, "callee", Property.NOT_ENUMERABLE, G$CALLEE, S$CALLEE);
-        map$ = map;
+        final ArrayList<Property> properties = new ArrayList<>(2);
+        properties.add(AccessorProperty.create("length", Property.NOT_ENUMERABLE, G$LENGTH, S$LENGTH));
+        properties.add(AccessorProperty.create("callee", Property.NOT_ENUMERABLE, G$CALLEE, S$CALLEE));
+        map$ = PropertyMap.newMap(properties).setIsShared();
     }
 
     static PropertyMap getInitialMap() {
diff --git a/src/jdk/nashorn/internal/objects/NativeBoolean.java b/src/jdk/nashorn/internal/objects/NativeBoolean.java
index 962086c4..bb57cc71 100644
--- a/src/jdk/nashorn/internal/objects/NativeBoolean.java
+++ b/src/jdk/nashorn/internal/objects/NativeBoolean.java
@@ -40,7 +40,6 @@ import jdk.nashorn.internal.runtime.JSType;
 import jdk.nashorn.internal.runtime.PropertyMap;
 import jdk.nashorn.internal.runtime.ScriptObject;
 import jdk.nashorn.internal.runtime.ScriptRuntime;
-import jdk.nashorn.internal.lookup.MethodHandleFactory;
 import jdk.nashorn.internal.runtime.linker.PrimitiveLookup;
 
 /**
diff --git a/src/jdk/nashorn/internal/objects/NativeDebug.java b/src/jdk/nashorn/internal/objects/NativeDebug.java
index 43106eeb..30a42289 100644
--- a/src/jdk/nashorn/internal/objects/NativeDebug.java
+++ b/src/jdk/nashorn/internal/objects/NativeDebug.java
@@ -49,6 +49,7 @@ import jdk.nashorn.internal.runtime.linker.LinkerCallSite;
 public final class NativeDebug extends ScriptObject {
 
     // initialized by nasgen
+    @SuppressWarnings("unused")
     private static PropertyMap $nasgenmap$;
 
     private NativeDebug() {
@@ -144,7 +145,7 @@ public final class NativeDebug extends ScriptObject {
      */
     @Function(attributes = Attribute.NOT_ENUMERABLE, where = Where.CONSTRUCTOR)
     public static Object equals(final Object self, final Object obj1, final Object obj2) {
-        return (obj1 != null) ? obj1.equals(obj2) : false;
+        return Objects.equals(obj1, obj2);
     }
 
     /**
@@ -177,6 +178,15 @@ public final class NativeDebug extends ScriptObject {
     }
 
     /**
+     * Returns the property listener count for a script object
+     * @return listener count
+     */
+    @Function(attributes = Attribute.NOT_ENUMERABLE, where = Where.CONSTRUCTOR)
+    public static Object getListenerCount(final Object self, final Object obj) {
+        return (obj instanceof ScriptObject)? ((ScriptObject)obj).getListenerCount() : 0;
+    }
+
+    /**
      * Dump all Nashorn debug mode counters. Calling this may be better if
      * you want to print all counters. This way you can avoid too many callsites
      * due to counter access itself!!
@@ -197,6 +207,8 @@ public final class NativeDebug extends ScriptObject {
         out.println("ScriptFunction allocations " + ScriptFunction.getAllocations());
         out.println("PropertyMap count " + PropertyMap.getCount());
         out.println("PropertyMap cloned " + PropertyMap.getClonedCount());
+        out.println("PropertyMap shared " + PropertyMap.getSharedCount());
+        out.println("PropertyMap duplicated " + PropertyMap.getDuplicatedCount());
         out.println("PropertyMap history hit " + PropertyMap.getHistoryHit());
         out.println("PropertyMap proto invalidations " + PropertyMap.getProtoInvalidations());
         out.println("PropertyMap proto history hit " + PropertyMap.getProtoHistoryHit());
diff --git a/src/jdk/nashorn/internal/objects/NativeError.java b/src/jdk/nashorn/internal/objects/NativeError.java
index 0f233f18..dc6aef90 100644
--- a/src/jdk/nashorn/internal/objects/NativeError.java
+++ b/src/jdk/nashorn/internal/objects/NativeError.java
@@ -31,7 +31,6 @@ import static jdk.nashorn.internal.lookup.Lookup.MH;
 import java.lang.invoke.MethodHandle;
 import java.lang.invoke.MethodHandles;
 import jdk.nashorn.api.scripting.NashornException;
-import jdk.nashorn.internal.lookup.MethodHandleFactory;
 import jdk.nashorn.internal.objects.annotations.Attribute;
 import jdk.nashorn.internal.objects.annotations.Constructor;
 import jdk.nashorn.internal.objects.annotations.Function;
diff --git a/src/jdk/nashorn/internal/objects/NativeJSAdapter.java b/src/jdk/nashorn/internal/objects/NativeJSAdapter.java
index 8e98f4e1..1fda3767 100644
--- a/src/jdk/nashorn/internal/objects/NativeJSAdapter.java
+++ b/src/jdk/nashorn/internal/objects/NativeJSAdapter.java
@@ -48,7 +48,6 @@ import jdk.nashorn.internal.runtime.ScriptObject;
 import jdk.nashorn.internal.runtime.ScriptRuntime;
 import jdk.nashorn.internal.runtime.arrays.ArrayLikeIterator;
 import jdk.nashorn.internal.lookup.Lookup;
-import jdk.nashorn.internal.lookup.MethodHandleFactory;
 import jdk.nashorn.internal.scripts.JO;
 
 /**
diff --git a/src/jdk/nashorn/internal/objects/NativeJSON.java b/src/jdk/nashorn/internal/objects/NativeJSON.java
index 0fdb170f..863d531b 100644
--- a/src/jdk/nashorn/internal/objects/NativeJSON.java
+++ b/src/jdk/nashorn/internal/objects/NativeJSON.java
@@ -60,6 +60,7 @@ public final class NativeJSON extends ScriptObject {
             ScriptFunction.class, ScriptObject.class, Object.class, Object.class);
 
     // initialized by nasgen
+    @SuppressWarnings("unused")
     private static PropertyMap $nasgenmap$;
 
     private NativeJSON() {
diff --git a/src/jdk/nashorn/internal/objects/NativeMath.java b/src/jdk/nashorn/internal/objects/NativeMath.java
index c952bd1d..cc50fbb4 100644
--- a/src/jdk/nashorn/internal/objects/NativeMath.java
+++ b/src/jdk/nashorn/internal/objects/NativeMath.java
@@ -43,6 +43,7 @@ import jdk.nashorn.internal.runtime.ScriptObject;
 public final class NativeMath extends ScriptObject {
 
     // initialized by nasgen
+    @SuppressWarnings("unused")
     private static PropertyMap $nasgenmap$;
 
     private NativeMath() {
diff --git a/src/jdk/nashorn/internal/objects/NativeStrictArguments.java b/src/jdk/nashorn/internal/objects/NativeStrictArguments.java
index df2d17dd..de6e4b51 100644
--- a/src/jdk/nashorn/internal/objects/NativeStrictArguments.java
+++ b/src/jdk/nashorn/internal/objects/NativeStrictArguments.java
@@ -30,14 +30,14 @@ import static jdk.nashorn.internal.lookup.Lookup.MH;
 
 import java.lang.invoke.MethodHandle;
 import java.lang.invoke.MethodHandles;
+import java.util.ArrayList;
 import java.util.Arrays;
+import jdk.nashorn.internal.runtime.AccessorProperty;
 import jdk.nashorn.internal.runtime.Property;
 import jdk.nashorn.internal.runtime.PropertyMap;
 import jdk.nashorn.internal.runtime.ScriptFunction;
 import jdk.nashorn.internal.runtime.ScriptObject;
 import jdk.nashorn.internal.runtime.arrays.ArrayData;
-import jdk.nashorn.internal.lookup.Lookup;
-import jdk.nashorn.internal.lookup.MethodHandleFactory;
 
 /**
  * ECMA 10.6 Arguments Object.
@@ -54,14 +54,15 @@ public final class NativeStrictArguments extends ScriptObject {
     private static final PropertyMap map$;
 
     static {
-        PropertyMap map = PropertyMap.newMap();
-        map = Lookup.newProperty(map, "length", Property.NOT_ENUMERABLE, G$LENGTH, S$LENGTH);
+        final ArrayList<Property> properties = new ArrayList<>(1);
+        properties.add(AccessorProperty.create("length", Property.NOT_ENUMERABLE, G$LENGTH, S$LENGTH));
+        PropertyMap map = PropertyMap.newMap(properties);
         // In strict mode, the caller and callee properties should throw TypeError
         // Need to add properties directly to map since slots are assigned speculatively by newUserAccessors.
         final int flags = Property.NOT_ENUMERABLE | Property.NOT_CONFIGURABLE;
         map = map.addProperty(map.newUserAccessors("caller", flags));
         map = map.addProperty(map.newUserAccessors("callee", flags));
-        map$ = map;
+        map$ = map.setIsShared();
     }
 
     static PropertyMap getInitialMap() {
diff --git a/src/jdk/nashorn/internal/objects/PrototypeObject.java b/src/jdk/nashorn/internal/objects/PrototypeObject.java
index 64af4215..837fee8b 100644
--- a/src/jdk/nashorn/internal/objects/PrototypeObject.java
+++ b/src/jdk/nashorn/internal/objects/PrototypeObject.java
@@ -30,12 +30,12 @@ import static jdk.nashorn.internal.lookup.Lookup.MH;
 
 import java.lang.invoke.MethodHandle;
 import java.lang.invoke.MethodHandles;
+import java.util.ArrayList;
+import jdk.nashorn.internal.runtime.AccessorProperty;
 import jdk.nashorn.internal.runtime.Property;
 import jdk.nashorn.internal.runtime.PropertyMap;
 import jdk.nashorn.internal.runtime.ScriptFunction;
 import jdk.nashorn.internal.runtime.ScriptObject;
-import jdk.nashorn.internal.lookup.Lookup;
-import jdk.nashorn.internal.lookup.MethodHandleFactory;
 
 /**
  * Instances of this class serve as "prototype" object for script functions.
@@ -52,9 +52,9 @@ public class PrototypeObject extends ScriptObject {
     private static final MethodHandle SET_CONSTRUCTOR = findOwnMH("setConstructor", void.class, Object.class, Object.class);
 
     static {
-        PropertyMap map = PropertyMap.newMap();
-        map = Lookup.newProperty(map, "constructor", Property.NOT_ENUMERABLE, GET_CONSTRUCTOR, SET_CONSTRUCTOR);
-        map$ = map;
+        final ArrayList<Property> properties = new ArrayList<>(1);
+        properties.add(AccessorProperty.create("constructor", Property.NOT_ENUMERABLE, GET_CONSTRUCTOR, SET_CONSTRUCTOR));
+        map$ = PropertyMap.newMap(properties).setIsShared();
     }
 
     static PropertyMap getInitialMap() {
diff --git a/src/jdk/nashorn/internal/objects/ScriptFunctionImpl.java b/src/jdk/nashorn/internal/objects/ScriptFunctionImpl.java
index 921073d4..643d9acd 100644
--- a/src/jdk/nashorn/internal/objects/ScriptFunctionImpl.java
+++ b/src/jdk/nashorn/internal/objects/ScriptFunctionImpl.java
@@ -28,6 +28,7 @@ package jdk.nashorn.internal.objects;
 import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED;
 
 import java.lang.invoke.MethodHandle;
+import java.util.ArrayList;
 import jdk.nashorn.internal.runtime.GlobalFunctions;
 import jdk.nashorn.internal.runtime.Property;
 import jdk.nashorn.internal.runtime.PropertyMap;
@@ -36,6 +37,7 @@ import jdk.nashorn.internal.runtime.ScriptFunction;
 import jdk.nashorn.internal.runtime.ScriptFunctionData;
 import jdk.nashorn.internal.runtime.ScriptObject;
 import jdk.nashorn.internal.lookup.Lookup;
+import jdk.nashorn.internal.runtime.AccessorProperty;
 
 /**
  * Concrete implementation of ScriptFunction. This sets correct map for the
@@ -57,6 +59,10 @@ public class ScriptFunctionImpl extends ScriptFunction {
         return map$;
     }
 
+    static PropertyMap getInitialAnonymousMap() {
+        return AnonymousFunction.getInitialMap();
+    }
+
     static PropertyMap getInitialStrictMap() {
         return strictmodemap$;
     }
@@ -149,13 +155,18 @@ public class ScriptFunctionImpl extends ScriptFunction {
     }
 
     static {
-        PropertyMap map = PropertyMap.newMap();
-        map = Lookup.newProperty(map, "prototype", Property.NOT_ENUMERABLE | Property.NOT_CONFIGURABLE, G$PROTOTYPE, S$PROTOTYPE);
-        map = Lookup.newProperty(map, "length",    Property.NOT_ENUMERABLE | Property.NOT_CONFIGURABLE | Property.NOT_WRITABLE, G$LENGTH, null);
-        map = Lookup.newProperty(map, "name",      Property.NOT_ENUMERABLE | Property.NOT_CONFIGURABLE | Property.NOT_WRITABLE, G$NAME, null);
-        map$ = map;
+        final ArrayList<Property> properties = new ArrayList<>(3);
+        properties.add(AccessorProperty.create("prototype", Property.NOT_ENUMERABLE | Property.NOT_CONFIGURABLE, G$PROTOTYPE, S$PROTOTYPE));
+        properties.add(AccessorProperty.create("length",  Property.NOT_ENUMERABLE | Property.NOT_CONFIGURABLE | Property.NOT_WRITABLE, G$LENGTH, null));
+        properties.add(AccessorProperty.create("name", Property.NOT_ENUMERABLE | Property.NOT_CONFIGURABLE | Property.NOT_WRITABLE, G$NAME, null));
+        map$ = PropertyMap.newMap(properties);
         strictmodemap$ = createStrictModeMap(map$);
         boundfunctionmap$ = createBoundFunctionMap(strictmodemap$);
+        // There are order dependencies between normal map, struct map and bound map
+        // We can make these 'shared' only after initialization of all three.
+        map$.setIsShared();
+        strictmodemap$.setIsShared();
+        boundfunctionmap$.setIsShared();
     }
 
     // function object representing TypeErrorThrower
@@ -201,15 +212,19 @@ public class ScriptFunctionImpl extends ScriptFunction {
     // Instance of this class is used as global anonymous function which
     // serves as Function.prototype object.
     private static class AnonymousFunction extends ScriptFunctionImpl {
-        private static final PropertyMap nasgenmap$$ = PropertyMap.newMap();
+        private static final PropertyMap map$ = PropertyMap.newMap().setIsShared();
+
+        static PropertyMap getInitialMap() {
+            return map$;
+        }
 
-        AnonymousFunction() {
-            super("", GlobalFunctions.ANONYMOUS, nasgenmap$$, null);
+        AnonymousFunction(final Global global) {
+            super("", GlobalFunctions.ANONYMOUS, global.getAnonymousFunctionMap(), null);
         }
     }
 
-    static ScriptFunctionImpl newAnonymousFunction() {
-        return new AnonymousFunction();
+    static ScriptFunctionImpl newAnonymousFunction(final Global global) {
+        return new AnonymousFunction(global);
     }
 
     /**
diff --git a/src/jdk/nashorn/internal/runtime/AccessorProperty.java b/src/jdk/nashorn/internal/runtime/AccessorProperty.java
index 6840d458..f7ece9df 100644
--- a/src/jdk/nashorn/internal/runtime/AccessorProperty.java
+++ b/src/jdk/nashorn/internal/runtime/AccessorProperty.java
@@ -107,6 +107,20 @@ public class AccessorProperty extends Property {
         SPILL_ELEMENT_SETTER = MH.filterArguments(MH.arrayElementSetter(Object[].class), 0, spillGetter);
     }
 
+    /**
+     * Create a new accessor property. Factory method used by nasgen generated code.
+     *
+     * @param key           {@link Property} key.
+     * @param propertyFlags {@link Property} flags.
+     * @param getter        {@link Property} get accessor method.
+     * @param setter        {@link Property} set accessor method.
+     *
+     * @return  New {@link AccessorProperty} created.
+     */
+    public static AccessorProperty create(final String key, final int propertyFlags, final MethodHandle getter, final MethodHandle setter) {
+        return new AccessorProperty(key, propertyFlags, -1, getter, setter);
+    }
+
     /** Seed getter for the primitive version of this field (in -Dnashorn.fields.dual=true mode) */
     private MethodHandle primitiveGetter;
 
diff --git a/src/jdk/nashorn/internal/runtime/Context.java b/src/jdk/nashorn/internal/runtime/Context.java
index 218be74e..8f00d521 100644
--- a/src/jdk/nashorn/internal/runtime/Context.java
+++ b/src/jdk/nashorn/internal/runtime/Context.java
@@ -253,13 +253,7 @@ public final class Context {
         this.env       = new ScriptEnvironment(options, out, err);
         this._strict   = env._strict;
         this.appLoader = appLoader;
-        this.scriptLoader = (ScriptLoader)AccessController.doPrivileged(
-             new PrivilegedAction<ClassLoader>() {
-                @Override
-                public ClassLoader run() {
-                    return new ScriptLoader(sharedLoader, Context.this);
-                }
-             });
+        this.scriptLoader = env._loader_per_compile? null : createNewLoader();
         this.errors    = errors;
 
         // if user passed -classpath option, make a class loader with that and set it as
diff --git a/src/jdk/nashorn/internal/runtime/PropertyListenerManager.java b/src/jdk/nashorn/internal/runtime/PropertyListenerManager.java
index 34db0cb3..1ce18b63 100644
--- a/src/jdk/nashorn/internal/runtime/PropertyListenerManager.java
+++ b/src/jdk/nashorn/internal/runtime/PropertyListenerManager.java
@@ -41,6 +41,7 @@ public class PropertyListenerManager implements PropertyListener {
     private static int listenersRemoved;
 
     /**
+     * Return aggregate listeners added to all PropertyListenerManagers
      * @return the listenersAdded
      */
     public static int getListenersAdded() {
@@ -48,12 +49,21 @@ public class PropertyListenerManager implements PropertyListener {
     }
 
     /**
+     * Return aggregate listeners removed from all PropertyListenerManagers
      * @return the listenersRemoved
      */
     public static int getListenersRemoved() {
         return listenersRemoved;
     }
 
+    /**
+     * Return listeners added to this PropertyListenerManager.
+     * @return the listener count
+     */
+    public final int getListenerCount() {
+        return listeners != null? listeners.size() : 0;
+    }
+
     // Property listener management methods
 
     /**
diff --git a/src/jdk/nashorn/internal/runtime/PropertyMap.java b/src/jdk/nashorn/internal/runtime/PropertyMap.java
index f8d9b437..05e8dc78 100644
--- a/src/jdk/nashorn/internal/runtime/PropertyMap.java
+++ b/src/jdk/nashorn/internal/runtime/PropertyMap.java
@@ -25,11 +25,8 @@
 
 package jdk.nashorn.internal.runtime;
 
-import jdk.nashorn.internal.scripts.JO;
-
 import static jdk.nashorn.internal.runtime.PropertyHashMap.EMPTY_HASHMAP;
 
-import java.lang.invoke.MethodHandle;
 import java.lang.invoke.SwitchPoint;
 import java.lang.ref.WeakReference;
 import java.util.Arrays;
@@ -57,9 +54,8 @@ public final class PropertyMap implements Iterable<Object>, PropertyListener {
     private static final int CLONEABLE_FLAGS_MASK = 0b0000_1111;
     /** Has a listener been added to this property map. This flag is not copied when cloning a map. See {@link PropertyListener} */
     public static final int IS_LISTENER_ADDED     = 0b0001_0000;
-
-    /** Empty map used for seed map for JO$ objects */
-    private static final PropertyMap EMPTY_MAP = new PropertyMap(EMPTY_HASHMAP);
+    /** Is this process wide "shared" map?. This flag is not copied when cloning a map */
+    public static final int IS_SHARED             = 0b0010_0000;
 
     /** Map status flags. */
     private int flags;
@@ -145,16 +141,17 @@ public final class PropertyMap implements Iterable<Object>, PropertyListener {
     }
 
     /**
-     * Duplicates this PropertyMap instance. This is used by nasgen generated
-     * prototype and constructor classes. {@link PropertyMap} used for singletons
-     * like these (and global instance) are duplicated using this method and used.
-     * The original filled map referenced by static fields of prototype and
-     * constructor classes are not touched. This allows multiple independent global
-     * instances to be used within a single context instance.
+     * Duplicates this PropertyMap instance. This is used to duplicate 'shared'
+     * maps {@link PropertyMap} used as process wide singletons. Shared maps are
+     * duplicated for every global scope object. That way listeners, proto and property
+     * histories are scoped within a global scope.
      *
      * @return Duplicated {@link PropertyMap}.
      */
     public PropertyMap duplicate() {
+        if (Context.DEBUG) {
+            duplicatedCount++;
+        }
         return new PropertyMap(this.properties);
     }
 
@@ -173,6 +170,15 @@ public final class PropertyMap implements Iterable<Object>, PropertyListener {
     }
 
     /**
+     * Public property map allocator. Used by nasgen generated code.
+     * @param properties Collection of initial properties.
+     * @return New {@link PropertyMap}.
+     */
+    public static PropertyMap newMap(final Collection<Property> properties) {
+        return (properties == null || properties.isEmpty())? newMap() : newMap(properties, 0, 0, 0);
+    }
+
+    /**
      * Return a sharable empty map.
      *
      * @return New empty {@link PropertyMap}.
@@ -199,6 +205,8 @@ public final class PropertyMap implements Iterable<Object>, PropertyListener {
      * @return A shared {@link SwitchPoint} for the property.
      */
     public SwitchPoint getProtoGetSwitchPoint(final ScriptObject proto, final String key) {
+        assert !isShared() : "proto SwitchPoint from a shared PropertyMap";
+
         if (proto == null) {
             return null;
         }
@@ -227,6 +235,8 @@ public final class PropertyMap implements Iterable<Object>, PropertyListener {
      * @param property {@link Property} to invalidate.
      */
     private void invalidateProtoGetSwitchPoint(final Property property) {
+        assert !isShared() : "proto invalidation on a shared PropertyMap";
+
         if (protoGetSwitches != null) {
             final String key = property.getKey();
             final SwitchPoint sp = protoGetSwitches.get(key);
@@ -241,17 +251,6 @@ public final class PropertyMap implements Iterable<Object>, PropertyListener {
     }
 
     /**
-     * Add a property to the map.
-     *
-     * @param property {@link Property} being added.
-     *
-     * @return New {@link PropertyMap} with {@link Property} added.
-     */
-    public PropertyMap newProperty(final Property property) {
-        return addProperty(property);
-    }
-
-    /**
      * Add a property to the map, re-binding its getters and setters,
      * if available, to a given receiver. This is typically the global scope. See
      * {@link ScriptObject#addBoundProperties(ScriptObject)}
@@ -261,23 +260,8 @@ public final class PropertyMap implements Iterable<Object>, PropertyListener {
      *
      * @return New {@link PropertyMap} with {@link Property} added.
      */
-    PropertyMap newPropertyBind(final AccessorProperty property, final ScriptObject bindTo) {
-        return newProperty(new AccessorProperty(property, bindTo));
-    }
-
-    /**
-     * Add a new accessor property to the map.
-     *
-     * @param key           {@link Property} key.
-     * @param propertyFlags {@link Property} flags.
-     * @param slot          {@link Property} slot.
-     * @param getter        {@link Property} get accessor method.
-     * @param setter        {@link Property} set accessor method.
-     *
-     * @return  New {@link PropertyMap} with {@link AccessorProperty} added.
-     */
-    public PropertyMap newProperty(final String key, final int propertyFlags, final int slot, final MethodHandle getter, final MethodHandle setter) {
-        return newProperty(new AccessorProperty(key, propertyFlags, slot, getter, setter));
+    PropertyMap addPropertyBind(final AccessorProperty property, final ScriptObject bindTo) {
+        return addProperty(new AccessorProperty(property, bindTo));
     }
 
     /**
@@ -479,6 +463,28 @@ public final class PropertyMap implements Iterable<Object>, PropertyListener {
     }
 
     /**
+     * Make this property map 'shared' one. Shared property map instances are
+     * process wide singleton objects. A shaped map should never be added as a listener
+     * to a proto object. Nor it should have history or proto history. A shared map
+     * is just a template that is meant to be duplicated before use. All nasgen initialized
+     * property maps are shared.
+     *
+     * @return this map after making it as shared
+     */
+    public PropertyMap setIsShared() {
+        assert !isListenerAdded() : "making PropertyMap shared after listener added";
+        assert protoHistory == null : "making PropertyMap shared after associating a proto with it";
+        if (Context.DEBUG) {
+            sharedCount++;
+        }
+
+        flags |= IS_SHARED;
+        // clear any history on this PropertyMap, won't be used.
+        history = null;
+        return this;
+    }
+
+    /**
      * Check for any configurable properties.
      *
      * @return {@code true} if any configurable.
@@ -544,6 +550,8 @@ public final class PropertyMap implements Iterable<Object>, PropertyListener {
      * @param newMap   {@link PropertyMap} associated with prototype.
      */
     private void addToProtoHistory(final ScriptObject newProto, final PropertyMap newMap) {
+        assert !isShared() : "proto history modified on a shared PropertyMap";
+
         if (protoHistory == null) {
             protoHistory = new WeakHashMap<>();
         }
@@ -558,6 +566,8 @@ public final class PropertyMap implements Iterable<Object>, PropertyListener {
      * @param newMap   Modified {@link PropertyMap}.
      */
     private void addToHistory(final Property property, final PropertyMap newMap) {
+        assert !isShared() : "history modified on a shared PropertyMap";
+
         if (!properties.isEmpty()) {
             if (history == null) {
                 history = new LinkedHashMap<>();
@@ -683,6 +693,15 @@ public final class PropertyMap implements Iterable<Object>, PropertyListener {
     }
 
     /**
+     * Check if this map shared or not.
+     *
+     * @return true if this map is shared.
+     */
+    public boolean isShared() {
+        return (flags & IS_SHARED) != 0;
+    }
+
+    /**
      * Test to see if {@link PropertyMap} is extensible.
      *
      * @return {@code true} if {@link PropertyMap} can be added to.
@@ -745,6 +764,8 @@ public final class PropertyMap implements Iterable<Object>, PropertyListener {
      * @return New {@link PropertyMap} with prototype changed.
      */
     PropertyMap changeProto(final ScriptObject oldProto, final ScriptObject newProto) {
+        assert !isShared() : "proto associated with a shared PropertyMap";
+
         if (oldProto == newProto) {
             return this;
         }
@@ -860,6 +881,8 @@ public final class PropertyMap implements Iterable<Object>, PropertyListener {
     // counters updated only in debug mode
     private static int count;
     private static int clonedCount;
+    private static int sharedCount;
+    private static int duplicatedCount;
     private static int historyHit;
     private static int protoInvalidations;
     private static int protoHistoryHit;
@@ -880,6 +903,20 @@ public final class PropertyMap implements Iterable<Object>, PropertyListener {
     }
 
     /**
+     * @return The number of maps that are shared.
+     */
+    public static int getSharedCount() {
+        return sharedCount;
+    }
+
+    /**
+     * @return The number of maps that are duplicated.
+     */
+    public static int getDuplicatedCount() {
+        return duplicatedCount;
+    }
+
+    /**
      * @return The number of times history was successfully used.
      */
     public static int getHistoryHit() {
diff --git a/src/jdk/nashorn/internal/runtime/ScriptEnvironment.java b/src/jdk/nashorn/internal/runtime/ScriptEnvironment.java
index f04dedf0..a2f1f4a0 100644
--- a/src/jdk/nashorn/internal/runtime/ScriptEnvironment.java
+++ b/src/jdk/nashorn/internal/runtime/ScriptEnvironment.java
@@ -119,9 +119,15 @@ public final class ScriptEnvironment {
     /** Create a new class loaded for each compilation */
     public final boolean _loader_per_compile;
 
+    /** Do not support Java support extensions. */
+    public final boolean _no_java;
+
     /** Do not support non-standard syntax extensions. */
     public final boolean _no_syntax_extensions;
 
+    /** Do not support typed arrays. */
+    public final boolean _no_typed_arrays;
+
     /** Package to which generated class files are added */
     public final String  _package;
 
@@ -207,7 +213,9 @@ public final class ScriptEnvironment {
         _fx                   = options.getBoolean("fx");
         _lazy_compilation     = options.getBoolean("lazy.compilation");
         _loader_per_compile   = options.getBoolean("loader.per.compile");
+        _no_java              = options.getBoolean("no.java");
         _no_syntax_extensions = options.getBoolean("no.syntax.extensions");
+        _no_typed_arrays      = options.getBoolean("no.typed.arrays");
         _package              = options.getString("package");
         _parse_only           = options.getBoolean("parse.only");
         _print_ast            = options.getBoolean("print.ast");
diff --git a/src/jdk/nashorn/internal/runtime/ScriptObject.java b/src/jdk/nashorn/internal/runtime/ScriptObject.java
index e4eaf77e..c56c32c7 100644
--- a/src/jdk/nashorn/internal/runtime/ScriptObject.java
+++ b/src/jdk/nashorn/internal/runtime/ScriptObject.java
@@ -213,7 +213,7 @@ public abstract class ScriptObject extends PropertyListenerManager implements Pr
                     final UserAccessorProperty prop = this.newUserAccessors(key, property.getFlags(), property.getGetterFunction(source), property.getSetterFunction(source));
                     newMap = newMap.addProperty(prop);
                 } else {
-                    newMap = newMap.newPropertyBind((AccessorProperty)property, source);
+                    newMap = newMap.addPropertyBind((AccessorProperty)property, source);
                 }
             }
         }
diff --git a/src/jdk/nashorn/internal/runtime/resources/Options.properties b/src/jdk/nashorn/internal/runtime/resources/Options.properties
index 4d7be62b..452ae88c 100644
--- a/src/jdk/nashorn/internal/runtime/resources/Options.properties
+++ b/src/jdk/nashorn/internal/runtime/resources/Options.properties
@@ -192,6 +192,14 @@ nashorn.option.loader.per.compile = {              \
     default=true                                   \
 }
 
+nashorn.option.no.java = {                         \
+    name="--no-java",                              \
+    short_name="-nj",                              \
+    is_undocumented=true,                          \
+    desc="No Java support",                        \
+    default=false                                  \
+}
+
 nashorn.option.no.syntax.extensions = {            \
     name="--no-syntax-extensions",                 \
     short_name="-nse",                             \
@@ -200,6 +208,14 @@ nashorn.option.no.syntax.extensions = {            \
     default=false                                  \
 }
 
+nashorn.option.no.typed.arrays = {                 \
+    name="--no-typed-arrays",                      \
+    short_name="-nta",                             \
+    is_undocumented=true,                          \
+    desc="No Typed arrays support",                \
+    default=false                                  \
+}
+
 nashorn.option.package = {                                     \
     name="--package",                                          \
     is_undocumented=true,                                      \
diff --git a/src/jdk/nashorn/internal/scripts/JO.java b/src/jdk/nashorn/internal/scripts/JO.java
index d6173918..f2f00062 100644
--- a/src/jdk/nashorn/internal/scripts/JO.java
+++ b/src/jdk/nashorn/internal/scripts/JO.java
@@ -33,7 +33,7 @@ import jdk.nashorn.internal.runtime.ScriptObject;
  */
 public class JO extends ScriptObject {
 
-    private static final PropertyMap map$ = PropertyMap.newMap();
+    private static final PropertyMap map$ = PropertyMap.newMap().setIsShared();
 
     /**
      * Returns the initial property map to be used.
diff --git a/src/jdk/nashorn/tools/Shell.java b/src/jdk/nashorn/tools/Shell.java
index 914c7b6e..55840078 100644
--- a/src/jdk/nashorn/tools/Shell.java
+++ b/src/jdk/nashorn/tools/Shell.java
@@ -435,6 +435,10 @@ public class Shell {
                     break;
                 }
 
+                if (source.isEmpty()) {
+                    continue;
+                }
+
                 Object res;
                 try {
                     res = context.eval(global, source, global, "<shell>", env._strict);