diff --git a/nashorn/.hgtags b/nashorn/.hgtags
index 6e7c8e3..70638d2 100644
--- a/nashorn/.hgtags
+++ b/nashorn/.hgtags
@@ -238,3 +238,4 @@
 b3517e51f40477f10db8bc30a557aa0ea712c274 jdk9-b02
 832f89ff25d903c45cfc994553f1ade8821a4398 jdk9-b03
 3f6ef92cd7823372c45e79125adba4cbf1c9f7b2 jdk9-b04
+2a1cac93c33317d828d4a5b81239204a9927cc4a jdk9-b05
diff --git a/nashorn/make/BuildNashorn.gmk b/nashorn/make/BuildNashorn.gmk
index fc87044..a987874 100644
--- a/nashorn/make/BuildNashorn.gmk
+++ b/nashorn/make/BuildNashorn.gmk
@@ -77,7 +77,7 @@
 	$(RM) -rf $(@D)/jdk $(@D)/netscape
 	$(CP) -R -p $(NASHORN_OUTPUTDIR)/nashorn_classes/* $(@D)/
 	$(FIXPATH) $(JAVA) \
-	    -cp "$(NASHORN_OUTPUTDIR)/nasgen_classes$(PATH_SEP)$(NASHORN_OUTPUTDIR)/nashorn_classes" \
+	    -Xbootclasspath/p:"$(NASHORN_OUTPUTDIR)/nasgen_classes$(PATH_SEP)$(NASHORN_OUTPUTDIR)/nashorn_classes" \
 	    jdk.nashorn.internal.tools.nasgen.Main $(@D) jdk.nashorn.internal.objects $(@D)
 	$(TOUCH) $@
 
diff --git a/nashorn/make/build.xml b/nashorn/make/build.xml
index 78a713b..74eae86 100644
--- a/nashorn/make/build.xml
+++ b/nashorn/make/build.xml
@@ -125,6 +125,7 @@
       <compilerarg value="-Xlint:unchecked"/>
       <compilerarg value="-Xlint:deprecation"/>
       <compilerarg value="-XDignore.symbol.file"/>
+      <compilerarg value="-Xdiags:verbose"/>
     </javac>
     <copy todir="${build.classes.dir}/META-INF/services">
        <fileset dir="${meta.inf.dir}/services/"/>
@@ -243,6 +244,7 @@
         <compilerarg value="-J-Djava.ext.dirs="/>
         <compilerarg value="-Xlint:unchecked"/>
         <compilerarg value="-Xlint:deprecation"/>
+        <compilerarg value="-Xdiags:verbose"/>
     </javac>
 
     <copy todir="${build.test.classes.dir}/META-INF/services">
@@ -253,6 +255,10 @@
        <fileset dir="${test.src.dir}/jdk/nashorn/internal/runtime/resources"/>
     </copy>
 
+    <copy todir="${build.test.classes.dir}/jdk/nashorn/api/scripting/resources">
+       <fileset dir="${test.src.dir}/jdk/nashorn/api/scripting/resources"/>
+    </copy>
+
     <!-- tests that check nashorn internals and internal API -->
     <jar jarfile="${nashorn.internal.tests.jar}">
       <fileset dir="${build.test.classes.dir}" excludes="**/api/**"/>
diff --git a/nashorn/make/project.properties b/nashorn/make/project.properties
index d51e72e..5af7287 100644
--- a/nashorn/make/project.properties
+++ b/nashorn/make/project.properties
@@ -206,7 +206,7 @@
 
 # test262 test frameworks
 test262-test-sys-prop.test.js.framework=\
-    --class-cache-size=0 \
+    --class-cache-size=10 \
     --no-java \
     --no-typed-arrays \
     -timezone=PST \
diff --git a/nashorn/src/jdk/nashorn/api/scripting/NashornScriptEngine.java b/nashorn/src/jdk/nashorn/api/scripting/NashornScriptEngine.java
index 3c4d29f..9c14359 100644
--- a/nashorn/src/jdk/nashorn/api/scripting/NashornScriptEngine.java
+++ b/nashorn/src/jdk/nashorn/api/scripting/NashornScriptEngine.java
@@ -57,9 +57,9 @@
 import javax.script.ScriptEngineFactory;
 import javax.script.ScriptException;
 import javax.script.SimpleBindings;
+import jdk.nashorn.internal.objects.Global;
 import jdk.nashorn.internal.runtime.Context;
 import jdk.nashorn.internal.runtime.ErrorManager;
-import jdk.nashorn.internal.runtime.GlobalObject;
 import jdk.nashorn.internal.runtime.Property;
 import jdk.nashorn.internal.runtime.ScriptFunction;
 import jdk.nashorn.internal.runtime.ScriptObject;
@@ -99,7 +99,7 @@
     private final boolean             _global_per_engine;
     // This is the initial default Nashorn global object.
     // This is used as "shared" global if above option is true.
-    private final ScriptObject        global;
+    private final Global              global;
     // initialized bit late to be made 'final'.
     // Property object for "context" property of global object.
     private volatile Property         contextProperty;
@@ -264,7 +264,7 @@
     public Object __noSuchProperty__(final Object self, final ScriptContext ctxt, final String name) {
         if (ctxt != null) {
             final int scope = ctxt.getAttributesScope(name);
-            final ScriptObject ctxtGlobal = getNashornGlobalFrom(ctxt);
+            final Global ctxtGlobal = getNashornGlobalFrom(ctxt);
             if (scope != -1) {
                 return ScriptObjectMirror.unwrap(ctxt.getAttribute(name, scope), ctxtGlobal);
             }
@@ -317,7 +317,7 @@
         }
 
         ScriptObject realSelf = null;
-        ScriptObject realGlobal = null;
+        Global realGlobal = null;
         if(thiz == null) {
             // making interface out of global functions
             realSelf = realGlobal = getNashornGlobalFrom(context);
@@ -346,7 +346,7 @@
         }
 
         try {
-            final ScriptObject oldGlobal = Context.getGlobal();
+            final Global oldGlobal = Context.getGlobal();
             final boolean globalChanged = (oldGlobal != realGlobal);
             try {
                 if (globalChanged) {
@@ -371,7 +371,7 @@
     }
 
     // Retrieve nashorn Global object for a given ScriptContext object
-    private ScriptObject getNashornGlobalFrom(final ScriptContext ctxt) {
+    private Global getNashornGlobalFrom(final ScriptContext ctxt) {
         if (_global_per_engine) {
             // shared single global object for all ENGINE_SCOPE Bindings
             return global;
@@ -380,18 +380,18 @@
         final Bindings bindings = ctxt.getBindings(ScriptContext.ENGINE_SCOPE);
         // is this Nashorn's own Bindings implementation?
         if (bindings instanceof ScriptObjectMirror) {
-            final ScriptObject sobj = globalFromMirror((ScriptObjectMirror)bindings);
-            if (sobj != null) {
-                return sobj;
+            final Global glob = globalFromMirror((ScriptObjectMirror)bindings);
+            if (glob != null) {
+                return glob;
             }
         }
 
         // Arbitrary user Bindings implementation. Look for NASHORN_GLOBAL in it!
         Object scope = bindings.get(NASHORN_GLOBAL);
         if (scope instanceof ScriptObjectMirror) {
-            final ScriptObject sobj = globalFromMirror((ScriptObjectMirror)scope);
-            if (sobj != null) {
-                return sobj;
+            final Global glob = globalFromMirror((ScriptObjectMirror)scope);
+            if (glob != null) {
+                return glob;
             }
         }
 
@@ -399,14 +399,14 @@
         // Create new global instance mirror and associate with the Bindings.
         final ScriptObjectMirror mirror = createGlobalMirror(ctxt);
         bindings.put(NASHORN_GLOBAL, mirror);
-        return mirror.getScriptObject();
+        return mirror.getHomeGlobal();
     }
 
     // Retrieve nashorn Global object from a given ScriptObjectMirror
-    private ScriptObject globalFromMirror(final ScriptObjectMirror mirror) {
+    private Global globalFromMirror(final ScriptObjectMirror mirror) {
         ScriptObject sobj = mirror.getScriptObject();
-        if (sobj instanceof GlobalObject && isOfContext(sobj, nashornContext)) {
-            return sobj;
+        if (sobj instanceof Global && isOfContext((Global)sobj, nashornContext)) {
+            return (Global)sobj;
         }
 
         return null;
@@ -414,15 +414,15 @@
 
     // Create a new ScriptObjectMirror wrapping a newly created Nashorn Global object
     private ScriptObjectMirror createGlobalMirror(final ScriptContext ctxt) {
-        final ScriptObject newGlobal = createNashornGlobal(ctxt);
+        final Global newGlobal = createNashornGlobal(ctxt);
         return new ScriptObjectMirror(newGlobal, newGlobal);
     }
 
     // Create a new Nashorn Global object
-    private ScriptObject createNashornGlobal(final ScriptContext ctxt) {
-        final ScriptObject newGlobal = AccessController.doPrivileged(new PrivilegedAction<ScriptObject>() {
+    private Global createNashornGlobal(final ScriptContext ctxt) {
+        final Global newGlobal = AccessController.doPrivileged(new PrivilegedAction<Global>() {
             @Override
-            public ScriptObject run() {
+            public Global run() {
                 try {
                     return nashornContext.newGlobal();
                 } catch (final RuntimeException e) {
@@ -460,7 +460,7 @@
     }
 
     // scripts should see "context" and "engine" as variables in the given global object
-    private void setContextVariables(final ScriptObject ctxtGlobal, final ScriptContext ctxt) {
+    private void setContextVariables(final Global ctxtGlobal, final ScriptContext ctxt) {
         // set "context" global variable via contextProperty - because this
         // property is non-writable
         contextProperty.setObjectValue(ctxtGlobal, ctxtGlobal, ctxt, false);
@@ -470,7 +470,7 @@
         }
         // if no arguments passed, expose it
         if (! (args instanceof ScriptObject)) {
-            args = ((GlobalObject)ctxtGlobal).wrapAsObject(args);
+            args = ctxtGlobal.wrapAsObject(args);
             ctxtGlobal.set("arguments", args, false);
         }
     }
@@ -478,7 +478,7 @@
     private Object invokeImpl(final Object selfObject, final String name, final Object... args) throws ScriptException, NoSuchMethodException {
         name.getClass(); // null check
 
-        ScriptObject invokeGlobal = null;
+        Global invokeGlobal = null;
         ScriptObjectMirror selfMirror = null;
         if (selfObject instanceof ScriptObjectMirror) {
             selfMirror = (ScriptObjectMirror)selfObject;
@@ -489,7 +489,7 @@
         } else if (selfObject instanceof ScriptObject) {
             // invokeMethod called from script code - in which case we may get 'naked' ScriptObject
             // Wrap it with oldGlobal to make a ScriptObjectMirror for the same.
-            final ScriptObject oldGlobal = Context.getGlobal();
+            final Global oldGlobal = Context.getGlobal();
             invokeGlobal = oldGlobal;
             if (oldGlobal == null) {
                 throw new IllegalArgumentException(getMessage("no.current.nashorn.global"));
@@ -502,7 +502,7 @@
             selfMirror = (ScriptObjectMirror)ScriptObjectMirror.wrap(selfObject, oldGlobal);
         } else if (selfObject == null) {
             // selfObject is null => global function call
-            final ScriptObject ctxtGlobal = getNashornGlobalFrom(context);
+            final Global ctxtGlobal = getNashornGlobalFrom(context);
             invokeGlobal = ctxtGlobal;
             selfMirror = (ScriptObjectMirror)ScriptObjectMirror.wrap(ctxtGlobal, ctxtGlobal);
         }
@@ -532,11 +532,11 @@
         return evalImpl(script, ctxt, getNashornGlobalFrom(ctxt));
     }
 
-    private Object evalImpl(final ScriptFunction script, final ScriptContext ctxt, final ScriptObject ctxtGlobal) throws ScriptException {
+    private Object evalImpl(final ScriptFunction script, final ScriptContext ctxt, final Global ctxtGlobal) throws ScriptException {
         if (script == null) {
             return null;
         }
-        final ScriptObject oldGlobal = Context.getGlobal();
+        final Global oldGlobal = Context.getGlobal();
         final boolean globalChanged = (oldGlobal != ctxtGlobal);
         try {
             if (globalChanged) {
@@ -558,7 +558,7 @@
         }
     }
 
-    private static void throwAsScriptException(final Exception e, final ScriptObject global) throws ScriptException {
+    private static void throwAsScriptException(final Exception e, final Global global) throws ScriptException {
         if (e instanceof ScriptException) {
             throw (ScriptException)e;
         } else if (e instanceof NashornException) {
@@ -582,7 +582,7 @@
         return new CompiledScript() {
             @Override
             public Object eval(final ScriptContext ctxt) throws ScriptException {
-                final ScriptObject globalObject = getNashornGlobalFrom(ctxt);
+                final Global globalObject = getNashornGlobalFrom(ctxt);
                 // Are we running the script in the correct global?
                 if (func.getScope() == globalObject) {
                     return evalImpl(func, ctxt, globalObject);
@@ -602,8 +602,8 @@
         return compileImpl(source, getNashornGlobalFrom(ctxt));
     }
 
-    private ScriptFunction compileImpl(final Source source, final ScriptObject newGlobal) throws ScriptException {
-        final ScriptObject oldGlobal = Context.getGlobal();
+    private ScriptFunction compileImpl(final Source source, final Global newGlobal) throws ScriptException {
+        final Global oldGlobal = Context.getGlobal();
         final boolean globalChanged = (oldGlobal != newGlobal);
         try {
             if (globalChanged) {
@@ -641,8 +641,7 @@
         return true;
     }
 
-    private static boolean isOfContext(final ScriptObject global, final Context context) {
-        assert global instanceof GlobalObject: "Not a Global object";
-        return ((GlobalObject)global).isOfContext(context);
+    private static boolean isOfContext(final Global global, final Context context) {
+        return global.isOfContext(context);
     }
 }
diff --git a/nashorn/src/jdk/nashorn/api/scripting/ScriptObjectMirror.java b/nashorn/src/jdk/nashorn/api/scripting/ScriptObjectMirror.java
index 7a9792df..b125533 100644
--- a/nashorn/src/jdk/nashorn/api/scripting/ScriptObjectMirror.java
+++ b/nashorn/src/jdk/nashorn/api/scripting/ScriptObjectMirror.java
@@ -42,10 +42,10 @@
 import java.util.Set;
 import java.util.concurrent.Callable;
 import javax.script.Bindings;
+import jdk.nashorn.internal.objects.Global;
 import jdk.nashorn.internal.runtime.arrays.ArrayData;
 import jdk.nashorn.internal.runtime.ConsString;
 import jdk.nashorn.internal.runtime.Context;
-import jdk.nashorn.internal.runtime.GlobalObject;
 import jdk.nashorn.internal.runtime.JSType;
 import jdk.nashorn.internal.runtime.ScriptFunction;
 import jdk.nashorn.internal.runtime.ScriptObject;
@@ -64,7 +64,7 @@
     private static final AccessControlContext GET_CONTEXT_ACC_CTXT = getContextAccCtxt();
 
     private final ScriptObject sobj;
-    private final ScriptObject global;
+    private final Global  global;
     private final boolean strict;
 
     @Override
@@ -95,7 +95,7 @@
 
     @Override
     public Object call(final Object thiz, final Object... args) {
-        final ScriptObject oldGlobal = Context.getGlobal();
+        final Global oldGlobal = Context.getGlobal();
         final boolean globalChanged = (oldGlobal != global);
 
         try {
@@ -125,7 +125,7 @@
 
     @Override
     public Object newObject(final Object... args) {
-        final ScriptObject oldGlobal = Context.getGlobal();
+        final Global oldGlobal = Context.getGlobal();
         final boolean globalChanged = (oldGlobal != global);
 
         try {
@@ -171,7 +171,7 @@
 
     public Object callMember(final String functionName, final Object... args) {
         functionName.getClass(); // null check
-        final ScriptObject oldGlobal = Context.getGlobal();
+        final Global oldGlobal = Context.getGlobal();
         final boolean globalChanged = (oldGlobal != global);
 
         try {
@@ -642,7 +642,7 @@
      */
     public static Object wrap(final Object obj, final Object homeGlobal) {
         if(obj instanceof ScriptObject) {
-            return homeGlobal instanceof ScriptObject ? new ScriptObjectMirror((ScriptObject)obj, (ScriptObject)homeGlobal) : obj;
+            return homeGlobal instanceof Global ? new ScriptObjectMirror((ScriptObject)obj, (Global)homeGlobal) : obj;
         }
         if(obj instanceof ConsString) {
             return obj.toString();
@@ -710,13 +710,13 @@
 
     // package-privates below this.
 
-    ScriptObjectMirror(final ScriptObject sobj, final ScriptObject global) {
+    ScriptObjectMirror(final ScriptObject sobj, final Global global) {
         assert sobj != null : "ScriptObjectMirror on null!";
-        assert global instanceof GlobalObject : "global is not a GlobalObject";
+        assert global != null : "home Global is null";
 
         this.sobj = sobj;
         this.global = global;
-        this.strict = ((GlobalObject)global).isStrictContext();
+        this.strict = global.isStrictContext();
     }
 
     // accessors for script engine
@@ -724,7 +724,7 @@
         return sobj;
     }
 
-    ScriptObject getHomeGlobal() {
+    Global getHomeGlobal() {
         return global;
     }
 
@@ -734,7 +734,7 @@
 
     // internals only below this.
     private <V> V inGlobal(final Callable<V> callable) {
-        final ScriptObject oldGlobal = Context.getGlobal();
+        final Global oldGlobal = Context.getGlobal();
         final boolean globalChanged = (oldGlobal != global);
         if (globalChanged) {
             Context.setGlobal(global);
diff --git a/nashorn/src/jdk/nashorn/internal/codegen/Attr.java b/nashorn/src/jdk/nashorn/internal/codegen/Attr.java
index 177cfef..61ccb71 100644
--- a/nashorn/src/jdk/nashorn/internal/codegen/Attr.java
+++ b/nashorn/src/jdk/nashorn/internal/codegen/Attr.java
@@ -375,10 +375,11 @@
      * @return Symbol for given name or null for redefinition.
      */
     private Symbol defineSymbol(final Block block, final String name, final int symbolFlags) {
-        int    flags  = symbolFlags;
-        Symbol symbol = findSymbol(block, name); // Locate symbol.
+        int     flags    = symbolFlags;
+        Symbol  symbol   = findSymbol(block, name); // Locate symbol.
+        boolean isGlobal = (flags & KINDMASK) == IS_GLOBAL;
 
-        if ((flags & KINDMASK) == IS_GLOBAL) {
+        if (isGlobal) {
             flags |= IS_SCOPE;
         }
 
@@ -414,6 +415,8 @@
             // Determine where to create it.
             if ((flags & Symbol.KINDMASK) == IS_VAR && ((flags & IS_INTERNAL) == IS_INTERNAL || (flags & IS_LET) == IS_LET)) {
                 symbolBlock = block; //internal vars are always defined in the block closest to them
+            } else if (isGlobal) {
+                symbolBlock = lc.getOutermostFunction().getBody();
             } else {
                 symbolBlock = lc.getFunctionBody(function);
             }
diff --git a/nashorn/src/jdk/nashorn/internal/codegen/CodeGenerator.java b/nashorn/src/jdk/nashorn/internal/codegen/CodeGenerator.java
index 6ad9282..e0ca67a 100644
--- a/nashorn/src/jdk/nashorn/internal/codegen/CodeGenerator.java
+++ b/nashorn/src/jdk/nashorn/internal/codegen/CodeGenerator.java
@@ -685,7 +685,7 @@
             private void scopeCall(final IdentNode node, final int flags) {
                 load(node, Type.OBJECT); // Type.OBJECT as foo() makes no sense if foo == 3
                 // ScriptFunction will see CALLSITE_SCOPE and will bind scope accordingly.
-                method.loadNull(); //the 'this'
+                method.loadUndefined(Type.OBJECT); //the 'this' object
                 method.dynamicCall(callNodeType, 2 + loadArgs(args), flags);
             }
 
@@ -818,7 +818,7 @@
             protected boolean enterDefault(final Node node) {
                 // Load up function.
                 load(function, Type.OBJECT); //TODO, e.g. booleans can be used as functions
-                method.loadNull(); // ScriptFunction will figure out the correct this when it sees CALLSITE_SCOPE
+                method.loadUndefined(Type.OBJECT); // ScriptFunction will figure out the correct this when it sees CALLSITE_SCOPE
                 method.dynamicCall(callNodeType, 2 + loadArgs(args), getCallSiteFlags() | CALLSITE_SCOPE);
 
                 return false;
diff --git a/nashorn/src/jdk/nashorn/internal/codegen/SharedScopeCall.java b/nashorn/src/jdk/nashorn/internal/codegen/SharedScopeCall.java
index c7dfb40..da29ac0 100644
--- a/nashorn/src/jdk/nashorn/internal/codegen/SharedScopeCall.java
+++ b/nashorn/src/jdk/nashorn/internal/codegen/SharedScopeCall.java
@@ -156,7 +156,7 @@
         if (isCall) {
             method.convert(Type.OBJECT);
             // ScriptFunction will see CALLSITE_SCOPE and will bind scope accordingly.
-            method.loadNull();
+            method.loadUndefined(Type.OBJECT);
             int slot = 2;
             for (final Type type : paramTypes) {
                 method.load(type, slot++);
diff --git a/nashorn/src/jdk/nashorn/internal/ir/FunctionNode.java b/nashorn/src/jdk/nashorn/internal/ir/FunctionNode.java
index 1437eb4..a0f6a78 100644
--- a/nashorn/src/jdk/nashorn/internal/ir/FunctionNode.java
+++ b/nashorn/src/jdk/nashorn/internal/ir/FunctionNode.java
@@ -164,11 +164,11 @@
     public static final int HAS_EVAL                    = 1 << 5;
 
     /** Does a nested function contain eval? If it does, then all variables in this function might be get/set by it. */
-    public static final int HAS_NESTED_EVAL = 1 << 6;
+    public static final int HAS_NESTED_EVAL             = 1 << 6;
 
     /** Does this function have any blocks that create a scope? This is used to determine if the function needs to
      * have a local variable slot for the scope symbol. */
-    public static final int HAS_SCOPE_BLOCK = 1 << 7;
+    public static final int HAS_SCOPE_BLOCK             = 1 << 7;
 
     /**
      * Flag this function as one that defines the identifier "arguments" as a function parameter or nested function
@@ -197,6 +197,9 @@
     /** Can this function be specialized? */
     public static final int CAN_SPECIALIZE              = 1 << 14;
 
+    /** Does this function use the "this" keyword? */
+    public static final int USES_THIS                   = 1 << 15;
+
     /** Does this function or any nested functions contain an eval? */
     private static final int HAS_DEEP_EVAL = HAS_EVAL | HAS_NESTED_EVAL;
 
@@ -591,6 +594,15 @@
     }
 
     /**
+     * Return {@code true} if this function makes use of the {@code this} object.
+     *
+     * @return true if function uses {@code this} object
+     */
+    public boolean usesThis() {
+        return getFlag(USES_THIS);
+    }
+
+    /**
      * Get the identifier for this function, this is its symbol.
      * @return the identifier as an IdentityNode
      */
diff --git a/nashorn/src/jdk/nashorn/internal/objects/AccessorPropertyDescriptor.java b/nashorn/src/jdk/nashorn/internal/objects/AccessorPropertyDescriptor.java
index b3388eb..e39c521 100644
--- a/nashorn/src/jdk/nashorn/internal/objects/AccessorPropertyDescriptor.java
+++ b/nashorn/src/jdk/nashorn/internal/objects/AccessorPropertyDescriptor.java
@@ -67,12 +67,8 @@
     // initialized by nasgen
     private static PropertyMap $nasgenmap$;
 
-    static PropertyMap getInitialMap() {
-        return $nasgenmap$;
-    }
-
     AccessorPropertyDescriptor(final boolean configurable, final boolean enumerable, final Object get, final Object set, final Global global) {
-        super(global.getObjectPrototype(), getInitialMap());
+        super(global.getObjectPrototype(), $nasgenmap$);
         this.configurable = configurable;
         this.enumerable   = enumerable;
         this.get          = get;
diff --git a/nashorn/src/jdk/nashorn/internal/objects/ArrayBufferView.java b/nashorn/src/jdk/nashorn/internal/objects/ArrayBufferView.java
index a7252fc..7bd1d2f 100644
--- a/nashorn/src/jdk/nashorn/internal/objects/ArrayBufferView.java
+++ b/nashorn/src/jdk/nashorn/internal/objects/ArrayBufferView.java
@@ -42,12 +42,8 @@
     // initialized by nasgen
     private static PropertyMap $nasgenmap$;
 
-    static PropertyMap getInitialMap() {
-        return $nasgenmap$;
-    }
-
     private ArrayBufferView(final NativeArrayBuffer buffer, final int byteOffset, final int elementLength, final Global global) {
-        super(getInitialMap());
+        super($nasgenmap$);
         checkConstructorArgs(buffer, byteOffset, elementLength);
         this.setProto(getPrototype(global));
         this.setArray(factory().createArrayData(buffer, byteOffset, elementLength));
diff --git a/nashorn/src/jdk/nashorn/internal/objects/DataPropertyDescriptor.java b/nashorn/src/jdk/nashorn/internal/objects/DataPropertyDescriptor.java
index 9f7d2e4..e117c7e 100644
--- a/nashorn/src/jdk/nashorn/internal/objects/DataPropertyDescriptor.java
+++ b/nashorn/src/jdk/nashorn/internal/objects/DataPropertyDescriptor.java
@@ -64,12 +64,8 @@
     // initialized by nasgen
     private static PropertyMap $nasgenmap$;
 
-    static PropertyMap getInitialMap() {
-        return $nasgenmap$;
-    }
-
     DataPropertyDescriptor(final boolean configurable, final boolean enumerable, final boolean writable, final Object value, final Global global) {
-        super(global.getObjectPrototype(), getInitialMap());
+        super(global.getObjectPrototype(), $nasgenmap$);
         this.configurable = configurable;
         this.enumerable   = enumerable;
         this.writable     = writable;
diff --git a/nashorn/src/jdk/nashorn/internal/objects/GenericPropertyDescriptor.java b/nashorn/src/jdk/nashorn/internal/objects/GenericPropertyDescriptor.java
index bfa06cb..19cc8b6 100644
--- a/nashorn/src/jdk/nashorn/internal/objects/GenericPropertyDescriptor.java
+++ b/nashorn/src/jdk/nashorn/internal/objects/GenericPropertyDescriptor.java
@@ -55,12 +55,8 @@
     // initialized by nasgen
     private static PropertyMap $nasgenmap$;
 
-    static PropertyMap getInitialMap() {
-        return $nasgenmap$;
-    }
-
     GenericPropertyDescriptor(final boolean configurable, final boolean enumerable, final Global global) {
-        super(global.getObjectPrototype(), getInitialMap());
+        super(global.getObjectPrototype(), $nasgenmap$);
         this.configurable = configurable;
         this.enumerable   = enumerable;
     }
diff --git a/nashorn/src/jdk/nashorn/internal/objects/Global.java b/nashorn/src/jdk/nashorn/internal/objects/Global.java
index e8b12cb..9e40dbe 100644
--- a/nashorn/src/jdk/nashorn/internal/objects/Global.java
+++ b/nashorn/src/jdk/nashorn/internal/objects/Global.java
@@ -33,11 +33,8 @@
 import java.io.PrintWriter;
 import java.lang.invoke.MethodHandle;
 import java.lang.invoke.MethodHandles;
-import java.lang.ref.ReferenceQueue;
-import java.lang.ref.SoftReference;
 import java.lang.reflect.Field;
 import java.util.Arrays;
-import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.Callable;
@@ -51,7 +48,6 @@
 import jdk.nashorn.internal.runtime.ConsString;
 import jdk.nashorn.internal.runtime.Context;
 import jdk.nashorn.internal.runtime.GlobalFunctions;
-import jdk.nashorn.internal.runtime.GlobalObject;
 import jdk.nashorn.internal.runtime.JSType;
 import jdk.nashorn.internal.runtime.NativeJavaPackage;
 import jdk.nashorn.internal.runtime.PropertyDescriptor;
@@ -59,10 +55,10 @@
 import jdk.nashorn.internal.runtime.Scope;
 import jdk.nashorn.internal.runtime.ScriptEnvironment;
 import jdk.nashorn.internal.runtime.ScriptFunction;
+import jdk.nashorn.internal.runtime.ScriptFunctionData;
 import jdk.nashorn.internal.runtime.ScriptObject;
 import jdk.nashorn.internal.runtime.ScriptRuntime;
 import jdk.nashorn.internal.runtime.ScriptingFunctions;
-import jdk.nashorn.internal.runtime.Source;
 import jdk.nashorn.internal.runtime.arrays.ArrayData;
 import jdk.nashorn.internal.runtime.linker.Bootstrap;
 import jdk.nashorn.internal.runtime.linker.InvokeByName;
@@ -73,7 +69,7 @@
  * Representation of global scope.
  */
 @ScriptClass("Global")
-public final class Global extends ScriptObject implements GlobalObject, Scope {
+public final class Global extends ScriptObject implements Scope {
     private final InvokeByName TO_STRING = new InvokeByName("toString", ScriptObject.class);
     private final InvokeByName VALUE_OF  = new InvokeByName("valueOf",  ScriptObject.class);
 
@@ -229,6 +225,10 @@
     @Property(name = "ArrayBuffer", attributes = Attribute.NOT_ENUMERABLE)
     public volatile Object arrayBuffer;
 
+    /** DataView object */
+    @Property(name = "DataView", attributes = Attribute.NOT_ENUMERABLE)
+    public volatile Object dataView;
+
     /** TypedArray (int8) */
     @Property(name = "Int8Array", attributes = Attribute.NOT_ENUMERABLE)
     public volatile Object int8Array;
@@ -355,6 +355,7 @@
     private ScriptObject   builtinJavaImporter;
     private ScriptObject   builtinJavaApi;
     private ScriptObject   builtinArrayBuffer;
+    private ScriptObject   builtinDataView;
     private ScriptObject   builtinInt8Array;
     private ScriptObject   builtinUint8Array;
     private ScriptObject   builtinUint8ClampedArray;
@@ -373,9 +374,6 @@
     // Flag to indicate that a split method issued a return statement
     private int splitState = -1;
 
-    // class cache
-    private ClassCache classCache;
-
     // Used to store the last RegExp result to support deprecated RegExp constructor properties
     private RegExpResult lastRegExpResult;
 
@@ -426,11 +424,6 @@
         super(checkAndGetMap(context));
         this.context = context;
         this.setIsScope();
-
-        final int cacheSize = context.getEnv()._class_cache_size;
-        if (cacheSize > 0) {
-            classCache = new ClassCache(cacheSize);
-        }
     }
 
     /**
@@ -439,11 +432,9 @@
      * @return the global singleton
      */
     public static Global instance() {
-        ScriptObject global = Context.getGlobal();
-        if (! (global instanceof Global)) {
-            throw new IllegalStateException("no current global instance");
-        }
-        return (Global)global;
+        Global global = Context.getGlobal();
+        global.getClass(); // null check
+        return global;
     }
 
     /**
@@ -464,19 +455,30 @@
         return instance().getContext();
     }
 
-    // GlobalObject interface implementation
+    // Runtime interface to Global
 
-    @Override
+    /**
+     * Is this global of the given Context?
+     * @param ctxt the context
+     * @return true if this global belongs to the given Context
+     */
     public boolean isOfContext(final Context ctxt) {
         return this.context == ctxt;
     }
 
-    @Override
+    /**
+     * Does this global belong to a strict Context?
+     * @return true if this global belongs to a strict Context
+     */
     public boolean isStrictContext() {
         return context.getEnv()._strict;
     }
 
-    @Override
+    /**
+     * Initialize standard builtin objects like "Object", "Array", "Function" etc.
+     * as well as our extension builtin objects like "Java", "JSAdapter" as properties
+     * of the global scope object.
+     */
     public void initBuiltinObjects() {
         if (this.builtinObject != null) {
             // already initialized, just return
@@ -486,12 +488,26 @@
         init();
     }
 
-    @Override
+    /**
+     * Create a new ScriptFunction object
+     *
+     * @param name   function name
+     * @param handle invocation handle for function
+     * @param scope  the scope
+     * @param strict are we in strict mode
+     *
+     * @return new script function
+     */
     public ScriptFunction newScriptFunction(final String name, final MethodHandle handle, final ScriptObject scope, final boolean strict) {
-        return new ScriptFunctionImpl(name, handle, scope, null, strict, false, true);
+        return new ScriptFunctionImpl(name, handle, scope, null, strict ? ScriptFunctionData.IS_STRICT_CONSTRUCTOR : ScriptFunctionData.IS_CONSTRUCTOR);
     }
 
-    @Override
+    /**
+     * Wrap a Java object as corresponding script object
+     *
+     * @param obj object to wrap
+     * @return    wrapped object
+     */
     public Object wrapAsObject(final Object obj) {
         if (obj instanceof Boolean) {
             return new NativeBoolean((Boolean)obj, this);
@@ -513,7 +529,14 @@
         }
     }
 
-    @Override
+    /**
+     * Lookup helper for JS primitive types
+     *
+     * @param request the link request for the dynamic call site.
+     * @param self     self reference
+     *
+     * @return guarded invocation
+     */
     public GuardedInvocation primitiveLookup(final LinkRequest request, final Object self) {
         if (self instanceof String || self instanceof ConsString) {
             return NativeString.lookupPrimitive(request, self);
@@ -525,12 +548,23 @@
         throw new IllegalArgumentException("Unsupported primitive: " + self);
     }
 
-    @Override
+    /**
+     * Create a new empty script object
+     *
+     * @return the new ScriptObject
+     */
     public ScriptObject newObject() {
         return new JO(getObjectPrototype(), JO.getInitialMap());
     }
 
-    @Override
+    /**
+     * Default value of given type
+     *
+     * @param sobj     script object
+     * @param typeHint type hint
+     *
+     * @return default value
+     */
     public Object getDefaultValue(final ScriptObject sobj, final Class<?> typeHint) {
         // When the [[DefaultValue]] internal method of O is called with no hint,
         // then it behaves as if the hint were Number, unless O is a Date object
@@ -590,7 +624,12 @@
         return UNDEFINED;
     }
 
-    @Override
+    /**
+     * Is the given ScriptObject an ECMAScript Error object?
+     *
+     * @param sobj the object being checked
+     * @return true if sobj is an Error object
+     */
     public boolean isError(final ScriptObject sobj) {
         final ScriptObject errorProto = getErrorPrototype();
         ScriptObject proto = sobj.getProto();
@@ -603,52 +642,108 @@
         return false;
     }
 
-    @Override
+    /**
+     * Create a new ECMAScript Error object.
+     *
+     * @param msg error message
+     * @return newly created Error object
+     */
     public ScriptObject newError(final String msg) {
         return new NativeError(msg, this);
     }
 
-    @Override
+    /**
+     * Create a new ECMAScript EvalError object.
+     *
+     * @param msg error message
+     * @return newly created EvalError object
+     */
     public ScriptObject newEvalError(final String msg) {
         return new NativeEvalError(msg, this);
     }
 
-    @Override
+    /**
+     * Create a new ECMAScript RangeError object.
+     *
+     * @param msg error message
+     * @return newly created RangeError object
+     */
     public ScriptObject newRangeError(final String msg) {
         return new NativeRangeError(msg, this);
     }
 
-    @Override
+    /**
+     * Create a new ECMAScript ReferenceError object.
+     *
+     * @param msg error message
+     * @return newly created ReferenceError object
+     */
     public ScriptObject newReferenceError(final String msg) {
         return new NativeReferenceError(msg, this);
     }
 
-    @Override
+    /**
+     * Create a new ECMAScript SyntaxError object.
+     *
+     * @param msg error message
+     * @return newly created SyntaxError object
+     */
     public ScriptObject newSyntaxError(final String msg) {
         return new NativeSyntaxError(msg, this);
     }
 
-    @Override
+    /**
+     * Create a new ECMAScript TypeError object.
+     *
+     * @param msg error message
+     * @return newly created TypeError object
+     */
     public ScriptObject newTypeError(final String msg) {
         return new NativeTypeError(msg, this);
     }
 
-    @Override
+    /**
+     * Create a new ECMAScript URIError object.
+     *
+     * @param msg error message
+     * @return newly created URIError object
+     */
     public ScriptObject newURIError(final String msg) {
         return new NativeURIError(msg, this);
     }
 
-    @Override
+    /**
+     * Create a new ECMAScript GenericDescriptor object.
+     *
+     * @param configurable is the property configurable?
+     * @param enumerable is the property enumerable?
+     * @return newly created GenericDescriptor object
+     */
     public PropertyDescriptor newGenericDescriptor(final boolean configurable, final boolean enumerable) {
         return new GenericPropertyDescriptor(configurable, enumerable, this);
     }
 
-    @Override
+    /**
+     * Create a new ECMAScript DatePropertyDescriptor object.
+     *
+     * @param value of the data property
+     * @param configurable is the property configurable?
+     * @param enumerable is the property enumerable?
+     * @return newly created DataPropertyDescriptor object
+     */
     public PropertyDescriptor newDataDescriptor(final Object value, final boolean configurable, final boolean enumerable, final boolean writable) {
         return new DataPropertyDescriptor(configurable, enumerable, writable, value, this);
     }
 
-    @Override
+    /**
+     * Create a new ECMAScript AccessorPropertyDescriptor object.
+     *
+     * @param get getter function of the user accessor property
+     * @param set setter function of the user accessor property
+     * @param configurable is the property configurable?
+     * @param enumerable is the property enumerable?
+     * @return newly created AccessorPropertyDescriptor object
+     */
     public PropertyDescriptor newAccessorDescriptor(final Object get, final Object set, final boolean configurable, final boolean enumerable) {
         final AccessorPropertyDescriptor desc = new AccessorPropertyDescriptor(configurable, enumerable, get == null ? UNDEFINED : get, set == null ? UNDEFINED : set, this);
 
@@ -664,62 +759,6 @@
     }
 
 
-    /**
-     * Cache for compiled script classes.
-     */
-    @SuppressWarnings("serial")
-    private static class ClassCache extends LinkedHashMap<Source, ClassReference> {
-        private final int size;
-        private final ReferenceQueue<Class<?>> queue;
-
-        ClassCache(int size) {
-            super(size, 0.75f, true);
-            this.size = size;
-            this.queue = new ReferenceQueue<>();
-        }
-
-        void cache(final Source source, final Class<?> clazz) {
-            put(source, new ClassReference(clazz, queue, source));
-        }
-
-        @Override
-        protected boolean removeEldestEntry(final Map.Entry<Source, ClassReference> eldest) {
-            return size() > size;
-        }
-
-        @Override
-        public ClassReference get(Object key) {
-            for (ClassReference ref; (ref = (ClassReference)queue.poll()) != null; ) {
-                remove(ref.source);
-            }
-            return super.get(key);
-        }
-
-    }
-
-    private static class ClassReference extends SoftReference<Class<?>> {
-        private final Source source;
-
-        ClassReference(final Class<?> clazz, final ReferenceQueue<Class<?>> queue, final Source source) {
-            super(clazz, queue);
-            this.source = source;
-        }
-    }
-
-    // Class cache management
-    @Override
-    public Class<?> findCachedClass(final Source source) {
-        assert classCache != null : "Class cache used without being initialized";
-        ClassReference ref = classCache.get(source);
-        return ref != null ? ref.get() : null;
-    }
-
-    @Override
-    public void cacheClass(final Source source, final Class<?> clazz) {
-        assert classCache != null : "Class cache used without being initialized";
-        classCache.cache(source, clazz);
-    }
-
     private static <T> T getLazilyCreatedValue(final Object key, final Callable<T> creator, final Map<Object, T> map) {
         final T obj = map.get(key);
         if (obj != null) {
@@ -737,14 +776,25 @@
 
     private final Map<Object, InvokeByName> namedInvokers = new ConcurrentHashMap<>();
 
-    @Override
+
+    /**
+     * Get cached InvokeByName object for the given key
+     * @param key key to be associated with InvokeByName object
+     * @param creator if InvokeByName is absent 'creator' is called to make one (lazy init)
+     * @return InvokeByName object associated with the key.
+     */
     public InvokeByName getInvokeByName(final Object key, final Callable<InvokeByName> creator) {
         return getLazilyCreatedValue(key, creator, namedInvokers);
     }
 
     private final Map<Object, MethodHandle> dynamicInvokers = new ConcurrentHashMap<>();
 
-    @Override
+    /**
+     * Get cached dynamic method handle for the given key
+     * @param key key to be associated with dynamic method handle
+     * @param creator if method handle is absent 'creator' is called to make one (lazy init)
+     * @return dynamic method handle associated with the key.
+     */
     public MethodHandle getDynamicInvoker(final Object key, final Callable<MethodHandle> creator) {
         return getLazilyCreatedValue(key, creator, dynamicInvokers);
     }
@@ -933,6 +983,10 @@
         return ScriptFunction.getPrototype(builtinArrayBuffer);
     }
 
+    ScriptObject getDataViewPrototype() {
+        return ScriptFunction.getPrototype(builtinDataView);
+    }
+
     ScriptObject getInt8ArrayPrototype() {
         return ScriptFunction.getPrototype(builtinInt8Array);
     }
@@ -1701,6 +1755,7 @@
 
     private void initTypedArray() {
         this.builtinArrayBuffer       = initConstructor("ArrayBuffer");
+        this.builtinDataView          = initConstructor("DataView");
         this.builtinInt8Array         = initConstructor("Int8Array");
         this.builtinUint8Array        = initConstructor("Uint8Array");
         this.builtinUint8ClampedArray = initConstructor("Uint8ClampedArray");
@@ -1741,6 +1796,7 @@
         this.typeError         = this.builtinTypeError;
         this.uriError          = this.builtinURIError;
         this.arrayBuffer       = this.builtinArrayBuffer;
+        this.dataView          = this.builtinDataView;
         this.int8Array         = this.builtinInt8Array;
         this.uint8Array        = this.builtinUint8Array;
         this.uint8ClampedArray = this.builtinUint8ClampedArray;
@@ -1838,7 +1894,7 @@
         anon.deleteOwnProperty(anon.getMap().findProperty("prototype"));
 
         // use "getter" so that [[ThrowTypeError]] function's arity is 0 - as specified in step 10 of section 13.2.3
-        this.typeErrorThrower = new ScriptFunctionImpl("TypeErrorThrower", Lookup.TYPE_ERROR_THROWER_GETTER, null, null, false, false, false);
+        this.typeErrorThrower = new ScriptFunctionImpl("TypeErrorThrower", Lookup.TYPE_ERROR_THROWER_GETTER, null, null, 0);
         typeErrorThrower.setPrototype(UNDEFINED);
         // Non-constructor built-in functions do not have "prototype" property
         typeErrorThrower.deleteOwnProperty(typeErrorThrower.getMap().findProperty("prototype"));
diff --git a/nashorn/src/jdk/nashorn/internal/objects/NativeArray.java b/nashorn/src/jdk/nashorn/internal/objects/NativeArray.java
index cc62d23..168a2f8 100644
--- a/nashorn/src/jdk/nashorn/internal/objects/NativeArray.java
+++ b/nashorn/src/jdk/nashorn/internal/objects/NativeArray.java
@@ -156,10 +156,6 @@
     // initialized by nasgen
     private static PropertyMap $nasgenmap$;
 
-    static PropertyMap getInitialMap() {
-        return $nasgenmap$;
-    }
-
     /*
      * Constructors.
      */
@@ -208,7 +204,7 @@
     }
 
     NativeArray(final ArrayData arrayData, final Global global) {
-        super(global.getArrayPrototype(), getInitialMap());
+        super(global.getArrayPrototype(), $nasgenmap$);
         this.setArray(arrayData);
         this.setIsArray();
     }
diff --git a/nashorn/src/jdk/nashorn/internal/objects/NativeArrayBuffer.java b/nashorn/src/jdk/nashorn/internal/objects/NativeArrayBuffer.java
index dbc1b24..49a61c9 100644
--- a/nashorn/src/jdk/nashorn/internal/objects/NativeArrayBuffer.java
+++ b/nashorn/src/jdk/nashorn/internal/objects/NativeArrayBuffer.java
@@ -25,6 +25,7 @@
 
 package jdk.nashorn.internal.objects;
 
+import java.nio.ByteBuffer;
 import java.util.Arrays;
 import jdk.nashorn.internal.objects.annotations.Attribute;
 import jdk.nashorn.internal.objects.annotations.Constructor;
@@ -43,10 +44,6 @@
     // initialized by nasgen
     private static PropertyMap $nasgenmap$;
 
-    static PropertyMap getInitialMap() {
-        return $nasgenmap$;
-    }
-
     @Constructor(arity = 1)
     public static Object constructor(final boolean newObj, final Object self, final Object... args) {
         if (args.length == 0) {
@@ -57,7 +54,7 @@
     }
 
     protected NativeArrayBuffer(final byte[] byteArray, final Global global) {
-        super(global.getArrayBufferPrototype(), getInitialMap());
+        super(global.getArrayBufferPrototype(), $nasgenmap$);
         this.buffer = byteArray;
     }
 
@@ -128,4 +125,16 @@
     public int getByteLength() {
         return buffer.length;
     }
+
+    ByteBuffer getBuffer() {
+       return ByteBuffer.wrap(buffer);
+    }
+
+    ByteBuffer getBuffer(final int offset) {
+        return ByteBuffer.wrap(buffer, offset, buffer.length - offset);
+    }
+
+    ByteBuffer getBuffer(final int offset, final int length) {
+        return ByteBuffer.wrap(buffer, offset, length);
+    }
 }
diff --git a/nashorn/src/jdk/nashorn/internal/objects/NativeBoolean.java b/nashorn/src/jdk/nashorn/internal/objects/NativeBoolean.java
index bd95507..f737a6c 100644
--- a/nashorn/src/jdk/nashorn/internal/objects/NativeBoolean.java
+++ b/nashorn/src/jdk/nashorn/internal/objects/NativeBoolean.java
@@ -30,6 +30,7 @@
 
 import java.lang.invoke.MethodHandle;
 import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodType;
 import jdk.internal.dynalink.linker.GuardedInvocation;
 import jdk.internal.dynalink.linker.LinkRequest;
 import jdk.nashorn.internal.objects.annotations.Attribute;
@@ -50,22 +51,21 @@
 public final class NativeBoolean extends ScriptObject {
     private final boolean value;
 
-    final static MethodHandle WRAPFILTER = findWrapFilter();
+    // Method handle to create an object wrapper for a primitive boolean
+    private static final MethodHandle WRAPFILTER = findOwnMH("wrapFilter", MH.type(NativeBoolean.class, Object.class));
+    // Method handle to retrieve the Boolean prototype object
+    private static final MethodHandle PROTOFILTER = findOwnMH("protoFilter", MH.type(Object.class, Object.class));
 
     // initialized by nasgen
     private static PropertyMap $nasgenmap$;
 
-    static PropertyMap getInitialMap() {
-        return $nasgenmap$;
-    }
-
     private NativeBoolean(final boolean value, final ScriptObject proto, final PropertyMap map) {
         super(proto, map);
         this.value = value;
     }
 
     NativeBoolean(final boolean flag, final Global global) {
-        this(flag, global.getBooleanPrototype(), getInitialMap());
+        this(flag, global.getBooleanPrototype(), $nasgenmap$);
     }
 
     NativeBoolean(final boolean flag) {
@@ -164,7 +164,7 @@
      * @return Link to be invoked at call site.
      */
     public static GuardedInvocation lookupPrimitive(final LinkRequest request, final Object receiver) {
-        return PrimitiveLookup.lookupPrimitive(request, Boolean.class, new NativeBoolean((Boolean)receiver), WRAPFILTER);
+        return PrimitiveLookup.lookupPrimitive(request, Boolean.class, new NativeBoolean((Boolean)receiver), WRAPFILTER, PROTOFILTER);
     }
 
     /**
@@ -178,7 +178,12 @@
         return new NativeBoolean((Boolean)receiver);
     }
 
-    private static MethodHandle findWrapFilter() {
-        return MH.findStatic(MethodHandles.lookup(), NativeBoolean.class, "wrapFilter", MH.type(NativeBoolean.class, Object.class));
+    @SuppressWarnings("unused")
+    private static Object protoFilter(final Object object) {
+        return Global.instance().getBooleanPrototype();
+    }
+
+    private static MethodHandle findOwnMH(final String name, final MethodType type) {
+        return MH.findStatic(MethodHandles.lookup(), NativeBoolean.class, name, type);
     }
 }
diff --git a/nashorn/src/jdk/nashorn/internal/objects/NativeDataView.java b/nashorn/src/jdk/nashorn/internal/objects/NativeDataView.java
new file mode 100644
index 0000000..93b5f09
--- /dev/null
+++ b/nashorn/src/jdk/nashorn/internal/objects/NativeDataView.java
@@ -0,0 +1,1015 @@
+/*
+ * 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 jdk.nashorn.internal.objects;
+
+import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED;
+import static jdk.nashorn.internal.runtime.ECMAErrors.rangeError;
+import static jdk.nashorn.internal.runtime.ECMAErrors.typeError;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import jdk.nashorn.internal.objects.annotations.Attribute;
+import jdk.nashorn.internal.objects.annotations.Constructor;
+import jdk.nashorn.internal.objects.annotations.Function;
+import jdk.nashorn.internal.objects.annotations.Property;
+import jdk.nashorn.internal.objects.annotations.ScriptClass;
+import jdk.nashorn.internal.objects.annotations.SpecializedConstructor;
+import jdk.nashorn.internal.objects.annotations.SpecializedFunction;
+import jdk.nashorn.internal.runtime.JSType;
+import jdk.nashorn.internal.runtime.PropertyMap;
+import jdk.nashorn.internal.runtime.ScriptObject;
+import jdk.nashorn.internal.runtime.ScriptRuntime;
+
+/**
+ * <p>
+ * DataView builtin constructor. Based on the specification here:
+ * http://www.khronos.org/registry/typedarray/specs/latest/#8
+ * </p>
+ * <p>
+ * An ArrayBuffer is a useful object for representing an arbitrary chunk of data.
+ * In many cases, such data will be read from disk or from the network, and will
+ * not follow the alignment restrictions that are imposed on the typed array views
+ * described earlier. In addition, the data will often be heterogeneous in nature
+ * and have a defined byte order. The DataView view provides a low-level interface
+ * for reading such data from and writing it to an ArrayBuffer.
+ * </p>
+ * <p>
+ * Regardless of the host computer's endianness, DataView reads or writes values
+ * to or from main memory with a specified endianness: big or little.
+ * </p>
+ */
+@ScriptClass("DataView")
+public class NativeDataView extends ScriptObject {
+    // initialized by nasgen
+    private static PropertyMap $nasgenmap$;
+
+    // inherited ArrayBufferView properties
+
+    /**
+     * Underlying ArrayBuffer storage object
+     */
+    @Property(attributes = Attribute.NON_ENUMERABLE_CONSTANT)
+    public final Object buffer;
+
+    /**
+     * The offset in bytes from the start of the ArrayBuffer
+     */
+    @Property(attributes = Attribute.NON_ENUMERABLE_CONSTANT)
+    public final int byteOffset;
+
+    /**
+     * The number of bytes from the offset that this DataView will reference
+     */
+    @Property(attributes = Attribute.NON_ENUMERABLE_CONSTANT)
+    public final int byteLength;
+
+    // underlying ByteBuffer
+    private final ByteBuffer buf;
+
+    private NativeDataView(NativeArrayBuffer arrBuf) {
+        this(arrBuf, arrBuf.getBuffer(), 0);
+    }
+
+    private NativeDataView(NativeArrayBuffer arrBuf, int offset) {
+        this(arrBuf, bufferFrom(arrBuf, offset), offset);
+    }
+
+    private NativeDataView(NativeArrayBuffer arrBuf, int offset, int length) {
+        this(arrBuf, bufferFrom(arrBuf, offset, length), offset, length);
+    }
+
+    private NativeDataView(final NativeArrayBuffer arrBuf, final ByteBuffer buf, final int offset) {
+       this(arrBuf, buf, offset, buf.capacity() - offset);
+    }
+
+    private NativeDataView(final NativeArrayBuffer arrBuf, final ByteBuffer buf, final int offset, final int length) {
+        super(Global.instance().getDataViewPrototype(), $nasgenmap$);
+        this.buffer = arrBuf;
+        this.byteOffset = offset;
+        this.byteLength = length;
+        this.buf = buf;
+    }
+
+    /**
+     * Create a new DataView object using the passed ArrayBuffer for its
+     * storage. Optional byteOffset and byteLength can be used to limit the
+     * section of the buffer referenced. The byteOffset indicates the offset in
+     * bytes from the start of the ArrayBuffer, and the byteLength is the number
+     * of bytes from the offset that this DataView will reference. If both
+     * byteOffset and byteLength are omitted, the DataView spans the entire
+     * ArrayBuffer range. If the byteLength is omitted, the DataView extends from
+     * the given byteOffset until the end of the ArrayBuffer.
+     *
+     * If the given byteOffset and byteLength references an area beyond the end
+     * of the ArrayBuffer an exception is raised.
+
+     * @param newObj if this constructor was invoked with 'new' or not
+     * @param self   constructor function object
+     * @param args   arguments to the constructor
+     * @return newly constructed DataView object
+     */
+    @Constructor(arity = 1)
+    public static Object constructor(final boolean newObj, final Object self, final Object... args) {
+        if (args.length == 0 || !(args[0] instanceof NativeArrayBuffer)) {
+            throw typeError("not.an.arraybuffer.in.dataview");
+        }
+
+        final NativeArrayBuffer arrBuf = (NativeArrayBuffer) args[0];
+        switch (args.length) {
+            case 1:
+                return new NativeDataView(arrBuf);
+            case 2:
+                return new NativeDataView(arrBuf, JSType.toInt32(args[1]));
+            default:
+                return new NativeDataView(arrBuf, JSType.toInt32(args[1]), JSType.toInt32(args[2]));
+        }
+    }
+
+    /**
+     * Specialized version of DataView constructor
+     *
+     * @param newObj if this constructor was invoked with 'new' or not
+     * @param self   constructor function object
+     * @param arrBuf underlying ArrayBuffer storage object
+     * @param offset offset in bytes from the start of the ArrayBuffer
+     * @return newly constructed DataView object
+     */
+    @SpecializedConstructor
+    public static Object constructor(final boolean newObj, final Object self, final Object arrBuf, final int offset) {
+        if (!(arrBuf instanceof NativeArrayBuffer)) {
+            throw typeError("not.an.arraybuffer.in.dataview");
+        }
+        return new NativeDataView((NativeArrayBuffer) arrBuf, offset);
+    }
+
+    /**
+     * Specialized version of DataView constructor
+     *
+     * @param newObj if this constructor was invoked with 'new' or not
+     * @param self   constructor function object
+     * @param arrBuf underlying ArrayBuffer storage object
+     * @param offset in bytes from the start of the ArrayBuffer
+     * @param length is the number of bytes from the offset that this DataView will reference
+     * @return newly constructed DataView object
+     */
+    @SpecializedConstructor
+    public static Object constructor(final boolean newObj, final Object self, final Object arrBuf, final int offset, final int length) {
+        if (!(arrBuf instanceof NativeArrayBuffer)) {
+            throw typeError("not.an.arraybuffer.in.dataview");
+        }
+        return new NativeDataView((NativeArrayBuffer) arrBuf, offset, length);
+    }
+
+    // Gets the value of the given type at the specified byte offset
+    // from the start of the view. There is no alignment constraint;
+    // multi-byte values may be fetched from any offset.
+    //
+    // For multi-byte values, the optional littleEndian argument
+    // indicates whether a big-endian or little-endian value should be
+    // read. If false or undefined, a big-endian value is read.
+    //
+    // These methods raise an exception if they would read
+    // beyond the end of the view.
+
+    /**
+     * Get 8-bit signed int from given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to read from
+     * @return 8-bit signed int value at the byteOffset
+     */
+    @Function(attributes = Attribute.NOT_ENUMERABLE)
+    public static int getInt8(final Object self, final Object byteOffset) {
+        try {
+            return getBuffer(self).get(JSType.toInt32(byteOffset));
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Get 8-bit signed int from given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to read from
+     * @return 8-bit signed int value at the byteOffset
+     */
+    @SpecializedFunction
+    public static int getInt8(final Object self, final int byteOffset) {
+        try {
+            return getBuffer(self).get(byteOffset);
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Get 8-bit unsigned int from given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to read from
+     * @return 8-bit unsigned int value at the byteOffset
+     */
+    @Function(attributes = Attribute.NOT_ENUMERABLE)
+    public static int getUint8(final Object self, final Object byteOffset) {
+        try {
+            return (0xFF & getBuffer(self).get(JSType.toInt32(byteOffset)));
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Get 8-bit unsigned int from given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to read from
+     * @return 8-bit unsigned int value at the byteOffset
+     */
+    @SpecializedFunction
+    public static int getUint8(final Object self, final int byteOffset) {
+        try {
+            return (0xFF & getBuffer(self).get(byteOffset));
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Get 16-bit signed int from given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to read from
+     * @param littleEndian (optional) flag indicating whether to read in little endian order
+     * @return 16-bit signed int value at the byteOffset
+     */
+    @Function(attributes = Attribute.NOT_ENUMERABLE, arity = 1)
+    public static int getInt16(final Object self, final Object byteOffset, final Object littleEndian) {
+        try {
+            return getBuffer(self, littleEndian).getShort(JSType.toInt32(byteOffset));
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Get 16-bit signed int from given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to read from
+     * @return 16-bit signed int value at the byteOffset
+     */
+    @SpecializedFunction
+    public static int getInt16(final Object self, final int byteOffset) {
+        try {
+            return getBuffer(self, false).getShort(byteOffset);
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Get 16-bit signed int from given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to read from
+     * @param littleEndian (optional) flag indicating whether to read in little endian order
+     * @return 16-bit signed int value at the byteOffset
+     */
+    @SpecializedFunction
+    public static int getInt16(final Object self, final int byteOffset, final boolean littleEndian) {
+        try {
+            return getBuffer(self, littleEndian).getShort(byteOffset);
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Get 16-bit unsigned int from given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to read from
+     * @param littleEndian (optional) flag indicating whether to read in little endian order
+     * @return 16-bit unsigned int value at the byteOffset
+     */
+    @Function(attributes = Attribute.NOT_ENUMERABLE, arity = 1)
+    public static int getUint16(final Object self, final Object byteOffset, final Object littleEndian) {
+        try {
+            return (int) (0xFFFF & getBuffer(self, littleEndian).getShort(JSType.toInt32(byteOffset)));
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Get 16-bit unsigned int from given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to read from
+     * @return 16-bit unsigned int value at the byteOffset
+     */
+    @SpecializedFunction
+    public static int getUint16(final Object self, final int byteOffset) {
+        try {
+            return (int) (0xFFFF & getBuffer(self, false).getShort(byteOffset));
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Get 16-bit unsigned int from given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to read from
+     * @param littleEndian (optional) flag indicating whether to read in little endian order
+     * @return 16-bit unsigned int value at the byteOffset
+     */
+    @SpecializedFunction
+    public static int getUint16(final Object self, final int byteOffset, final boolean littleEndian) {
+        try {
+            return (int) (0xFFFF & getBuffer(self, littleEndian).getShort(byteOffset));
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Get 32-bit signed int from given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to read from
+     * @param littleEndian (optional) flag indicating whether to read in little endian order
+     * @return 32-bit signed int value at the byteOffset
+     */
+    @Function(attributes = Attribute.NOT_ENUMERABLE, arity = 1)
+    public static int getInt32(final Object self, final Object byteOffset, final Object littleEndian) {
+        try {
+            return getBuffer(self, littleEndian).getInt(JSType.toInt32(byteOffset));
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Get 32-bit signed int from given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to read from
+     * @return 32-bit signed int value at the byteOffset
+     */
+    @SpecializedFunction
+    public static int getInt32(final Object self, final int byteOffset) {
+        try {
+            return getBuffer(self, false).getInt(byteOffset);
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Get 32-bit signed int from given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to read from
+     * @param littleEndian (optional) flag indicating whether to read in little endian order
+     * @return 32-bit signed int value at the byteOffset
+     */
+    @SpecializedFunction
+    public static int getInt32(final Object self, final int byteOffset, final boolean littleEndian) {
+        try {
+            return getBuffer(self, littleEndian).getInt(byteOffset);
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Get 32-bit unsigned int from given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to read from
+     * @param littleEndian (optional) flag indicating whether to read in little endian order
+     * @return 32-bit unsigned int value at the byteOffset
+     */
+    @Function(attributes = Attribute.NOT_ENUMERABLE, arity = 1)
+    public static long getUint32(final Object self, final Object byteOffset, final Object littleEndian) {
+        try {
+            return (long) (0xFFFFFFFFL & getBuffer(self, littleEndian).getInt(JSType.toInt32(byteOffset)));
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Get 32-bit unsigned int from given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to read from
+     * @return 32-bit unsigned int value at the byteOffset
+     */
+    @SpecializedFunction
+    public static long getUint32(final Object self, final int byteOffset) {
+        try {
+            return (long) (0xFFFFFFFFL & getBuffer(self, false).getInt(JSType.toInt32(byteOffset)));
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Get 32-bit unsigned int from given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to read from
+     * @param littleEndian (optional) flag indicating whether to read in little endian order
+     * @return 32-bit unsigned int value at the byteOffset
+     */
+    @SpecializedFunction
+    public static long getUint32(final Object self, final int byteOffset, final boolean littleEndian) {
+        try {
+            return (long) (0xFFFFFFFFL & getBuffer(self, littleEndian).getInt(JSType.toInt32(byteOffset)));
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Get 32-bit float value from given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to read from
+     * @param littleEndian (optional) flag indicating whether to read in little endian order
+     * @return 32-bit float value at the byteOffset
+     */
+    @Function(attributes = Attribute.NOT_ENUMERABLE, arity = 1)
+    public static double getFloat32(final Object self, final Object byteOffset, final Object littleEndian) {
+        try {
+            return getBuffer(self, littleEndian).getFloat(JSType.toInt32(byteOffset));
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Get 32-bit float value from given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to read from
+     * @return 32-bit float value at the byteOffset
+     */
+    @SpecializedFunction
+    public static double getFloat32(final Object self, final int byteOffset) {
+        try {
+            return getBuffer(self, false).getFloat(byteOffset);
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Get 32-bit float value from given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to read from
+     * @param littleEndian (optional) flag indicating whether to read in little endian order
+     * @return 32-bit float value at the byteOffset
+     */
+    @SpecializedFunction
+    public static double getFloat32(final Object self, final int byteOffset, final boolean littleEndian) {
+        try {
+            return getBuffer(self, littleEndian).getFloat(byteOffset);
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Get 64-bit float value from given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to read from
+     * @param littleEndian (optional) flag indicating whether to read in little endian order
+     * @return 64-bit float value at the byteOffset
+     */
+    @Function(attributes = Attribute.NOT_ENUMERABLE, arity = 1)
+    public static double getFloat64(final Object self, final Object byteOffset, final Object littleEndian) {
+        try {
+            return getBuffer(self, littleEndian).getDouble(JSType.toInt32(byteOffset));
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Get 64-bit float value from given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to read from
+     * @return 64-bit float value at the byteOffset
+     */
+    @SpecializedFunction
+    public static double getFloat64(final Object self, final int byteOffset) {
+        try {
+            return getBuffer(self, false).getDouble(byteOffset);
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Get 64-bit float value from given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to read from
+     * @param littleEndian (optional) flag indicating whether to read in little endian order
+     * @return 64-bit float value at the byteOffset
+     */
+    @SpecializedFunction
+    public static double getFloat64(final Object self, final int byteOffset, final boolean littleEndian) {
+        try {
+            return getBuffer(self, littleEndian).getDouble(byteOffset);
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    // Stores a value of the given type at the specified byte offset
+    // from the start of the view. There is no alignment constraint;
+    // multi-byte values may be stored at any offset.
+    //
+    // For multi-byte values, the optional littleEndian argument
+    // indicates whether the value should be stored in big-endian or
+    // little-endian byte order. If false or undefined, the value is
+    // stored in big-endian byte order.
+    //
+    // These methods raise an exception if they would write
+    // beyond the end of the view.
+
+    /**
+     * Set 8-bit signed int at the given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to read from
+     * @param value byte value to set
+     * @return undefined
+     */
+    @Function(attributes = Attribute.NOT_ENUMERABLE, arity = 2)
+    public static Object setInt8(final Object self, final Object byteOffset, final Object value) {
+        try {
+            getBuffer(self).put(JSType.toInt32(byteOffset), (byte)JSType.toInt32(value));
+            return UNDEFINED;
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Set 8-bit signed int at the given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to read from
+     * @param value byte value to set
+     * @return undefined
+     */
+    @SpecializedFunction
+    public static Object setInt8(final Object self, final int byteOffset, final int value) {
+        try {
+            getBuffer(self).put(byteOffset, (byte)value);
+            return UNDEFINED;
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Set 8-bit unsigned int at the given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to write at
+     * @param value byte value to set
+     * @return undefined
+     */
+    @Function(attributes = Attribute.NOT_ENUMERABLE, arity = 2)
+    public static Object setUint8(final Object self, final Object byteOffset, final Object value) {
+        try {
+            getBuffer(self).put(JSType.toInt32(byteOffset), (byte)JSType.toInt32(value));
+            return UNDEFINED;
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Set 8-bit unsigned int at the given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to write at
+     * @param value byte value to set
+     * @return undefined
+     */
+    @SpecializedFunction
+    public static Object setUint8(final Object self, final int byteOffset, final int value) {
+        try {
+            getBuffer(self).put(byteOffset, (byte)value);
+            return UNDEFINED;
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Set 16-bit signed int at the given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to write at
+     * @param value short value to set
+     * @param littleEndian (optional) flag indicating whether to write in little endian order
+     * @return undefined
+     */
+    @Function(attributes = Attribute.NOT_ENUMERABLE, arity = 2)
+    public static Object setInt16(final Object self, final Object byteOffset, final Object value, final Object littleEndian) {
+        try {
+            getBuffer(self, littleEndian).putShort(JSType.toInt32(byteOffset), (short)JSType.toInt32(value));
+            return UNDEFINED;
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Set 16-bit signed int at the given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to write at
+     * @param value short value to set
+     * @return undefined
+     */
+    @SpecializedFunction
+    public static Object setInt16(final Object self, final int byteOffset, final int value) {
+        try {
+            getBuffer(self, false).putShort(byteOffset, (short)value);
+            return UNDEFINED;
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Set 16-bit signed int at the given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to write at
+     * @param value short value to set
+     * @param littleEndian (optional) flag indicating whether to write in little endian order
+     * @return undefined
+     */
+    @SpecializedFunction
+    public static Object setInt16(final Object self, final int byteOffset, final int value, final boolean littleEndian) {
+        try {
+            getBuffer(self, littleEndian).putShort(byteOffset, (short)value);
+            return UNDEFINED;
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Set 16-bit unsigned int at the given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to write at
+     * @param value short value to set
+     * @param littleEndian (optional) flag indicating whether to write in little endian order
+     * @return undefined
+     */
+    @Function(attributes = Attribute.NOT_ENUMERABLE, arity = 2)
+    public static Object setUint16(final Object self, final Object byteOffset, final Object value, final Object littleEndian) {
+        try {
+            getBuffer(self, littleEndian).putShort(JSType.toInt32(byteOffset), (short)JSType.toInt32(value));
+            return UNDEFINED;
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Set 16-bit unsigned int at the given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to write at
+     * @param value short value to set
+     * @return undefined
+     */
+    @SpecializedFunction
+    public static Object setUint16(final Object self, final int byteOffset, final int value) {
+        try {
+            getBuffer(self, false).putShort(byteOffset, (short)value);
+            return UNDEFINED;
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Set 16-bit unsigned int at the given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to write at
+     * @param value short value to set
+     * @param littleEndian (optional) flag indicating whether to write in little endian order
+     * @return undefined
+     */
+    @SpecializedFunction
+    public static Object setUint16(final Object self, final int byteOffset, final int value, final boolean littleEndian) {
+        try {
+            getBuffer(self, littleEndian).putShort(byteOffset, (short)value);
+            return UNDEFINED;
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Set 32-bit signed int at the given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to write at
+     * @param value int value to set
+     * @param littleEndian (optional) flag indicating whether to write in little endian order
+     * @return undefined
+     */
+    @Function(attributes = Attribute.NOT_ENUMERABLE, arity = 2)
+    public static Object setInt32(final Object self, final Object byteOffset, final Object value, final Object littleEndian) {
+        try {
+            getBuffer(self, littleEndian).putInt(JSType.toInt32(byteOffset), (int)JSType.toInt32(value));
+            return UNDEFINED;
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Set 32-bit signed int at the given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to write at
+     * @param value int value to set
+     * @return undefined
+     */
+    @SpecializedFunction
+    public static Object setInt32(final Object self, final int byteOffset, final int value) {
+        try {
+            getBuffer(self, false).putInt(byteOffset, value);
+            return UNDEFINED;
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Set 32-bit signed int at the given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to write at
+     * @param value int value to set
+     * @param littleEndian (optional) flag indicating whether to write in little endian order
+     * @return undefined
+     */
+    @SpecializedFunction
+    public static Object setInt32(final Object self, final int byteOffset, final int value, final boolean littleEndian) {
+        try {
+            getBuffer(self, littleEndian).putInt(byteOffset, value);
+            return UNDEFINED;
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Set 32-bit unsigned int at the given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to write at
+     * @param value int value to set
+     * @param littleEndian (optional) flag indicating whether to write in little endian order
+     * @return undefined
+     */
+    @Function(attributes = Attribute.NOT_ENUMERABLE, arity = 2)
+    public static Object setUint32(final Object self, final Object byteOffset, final Object value, final Object littleEndian) {
+        try {
+            getBuffer(self, littleEndian).putInt(JSType.toInt32(byteOffset), (int)JSType.toUint32(value));
+            return UNDEFINED;
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Set 32-bit unsigned int at the given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to write at
+     * @param value int value to set
+     * @return undefined
+     */
+    @SpecializedFunction
+    public static Object setUint32(final Object self, final int byteOffset, final long value) {
+        try {
+            getBuffer(self, false).putInt(byteOffset, (int)value);
+            return UNDEFINED;
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Set 32-bit unsigned int at the given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to write at
+     * @param value int value to set
+     * @param littleEndian (optional) flag indicating whether to write in little endian order
+     * @return undefined
+     */
+    @SpecializedFunction
+    public static Object setUint32(final Object self, final int byteOffset, final long value, final boolean littleEndian) {
+        try {
+            getBuffer(self, littleEndian).putInt(byteOffset, (int)value);
+            return UNDEFINED;
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Set 32-bit float at the given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to write at
+     * @param value float value to set
+     * @param littleEndian (optional) flag indicating whether to write in little endian order
+     * @return undefined
+     */
+    @Function(attributes = Attribute.NOT_ENUMERABLE, arity = 2)
+    public static Object setFloat32(final Object self, final Object byteOffset, final Object value, final Object littleEndian) {
+        try {
+            getBuffer(self, littleEndian).putFloat((int)JSType.toUint32(byteOffset), (float)JSType.toNumber(value));
+            return UNDEFINED;
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Set 32-bit float at the given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to write at
+     * @param value float value to set
+     * @return undefined
+     */
+    @SpecializedFunction
+    public static Object setFloat32(final Object self, final int byteOffset, final double value) {
+        try {
+            getBuffer(self, false).putFloat(byteOffset, (float)value);
+            return UNDEFINED;
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Set 32-bit float at the given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to write at
+     * @param value float value to set
+     * @param littleEndian (optional) flag indicating whether to write in little endian order
+     * @return undefined
+     */
+    @SpecializedFunction
+    public static Object setFloat32(final Object self, final int byteOffset, final double value, final boolean littleEndian) {
+        try {
+            getBuffer(self, littleEndian).putFloat(byteOffset, (float)value);
+            return UNDEFINED;
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Set 64-bit float at the given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to write at
+     * @param value double value to set
+     * @param littleEndian (optional) flag indicating whether to write in little endian order
+     * @return undefined
+     */
+    @Function(attributes = Attribute.NOT_ENUMERABLE, arity = 2)
+    public static Object setFloat64(final Object self, final Object byteOffset, final Object value, final Object littleEndian) {
+        try {
+            getBuffer(self, littleEndian).putDouble((int)JSType.toUint32(byteOffset), JSType.toNumber(value));
+            return UNDEFINED;
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Set 64-bit float at the given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to write at
+     * @param value double value to set
+     * @return undefined
+     */
+    @SpecializedFunction
+    public static Object setFloat64(final Object self, final int byteOffset, final double value) {
+        try {
+            getBuffer(self, false).putDouble(byteOffset, value);
+            return UNDEFINED;
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    /**
+     * Set 64-bit float at the given byteOffset
+     *
+     * @param self DataView object
+     * @param byteOffset byte offset to write at
+     * @param value double value to set
+     * @param littleEndian (optional) flag indicating whether to write in little endian order
+     * @return undefined
+     */
+    @SpecializedFunction
+    public static Object setFloat64(final Object self, final int byteOffset, final double value, final boolean littleEndian) {
+        try {
+            getBuffer(self, littleEndian).putDouble(byteOffset, value);
+            return UNDEFINED;
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.offset");
+        }
+    }
+
+    // internals only below this point
+    private static ByteBuffer bufferFrom(final NativeArrayBuffer nab, final int offset) {
+        try {
+            return nab.getBuffer(offset);
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.constructor.offset");
+        }
+    }
+
+    private static ByteBuffer bufferFrom(final NativeArrayBuffer nab, final int offset, final int length) {
+        try {
+            return nab.getBuffer(offset, length);
+        } catch (final IndexOutOfBoundsException ioe) {
+            throw rangeError(ioe, "dataview.constructor.offset");
+        }
+    }
+
+    private static NativeDataView checkSelf(final Object self) {
+        if (!(self instanceof NativeDataView)) {
+            throw typeError("not.an.arraybuffer", ScriptRuntime.safeToString(self));
+        }
+        return (NativeDataView)self;
+    }
+
+    private static ByteBuffer getBuffer(final Object self) {
+        return checkSelf(self).buf;
+    }
+
+    private static ByteBuffer getBuffer(final Object self, final Object littleEndian) {
+        return getBuffer(self, JSType.toBoolean(littleEndian));
+    }
+
+    private static ByteBuffer getBuffer(final Object self, final boolean littleEndian) {
+        return getBuffer(self).order(littleEndian? ByteOrder.LITTLE_ENDIAN : ByteOrder.BIG_ENDIAN);
+    }
+}
diff --git a/nashorn/src/jdk/nashorn/internal/objects/NativeDate.java b/nashorn/src/jdk/nashorn/internal/objects/NativeDate.java
index b0d1202..34e27f1 100644
--- a/nashorn/src/jdk/nashorn/internal/objects/NativeDate.java
+++ b/nashorn/src/jdk/nashorn/internal/objects/NativeDate.java
@@ -114,10 +114,6 @@
     // initialized by nasgen
     private static PropertyMap $nasgenmap$;
 
-    static PropertyMap getInitialMap() {
-        return $nasgenmap$;
-    }
-
     private NativeDate(final double time, final ScriptObject proto, final PropertyMap map) {
         super(proto, map);
         final ScriptEnvironment env = Global.getEnv();
@@ -127,7 +123,7 @@
     }
 
     NativeDate(final double time, final Global global) {
-        this(time, global.getDatePrototype(), getInitialMap());
+        this(time, global.getDatePrototype(), $nasgenmap$);
     }
 
     private NativeDate (final double time) {
diff --git a/nashorn/src/jdk/nashorn/internal/objects/NativeError.java b/nashorn/src/jdk/nashorn/internal/objects/NativeError.java
index e1a4730..3dea272 100644
--- a/nashorn/src/jdk/nashorn/internal/objects/NativeError.java
+++ b/nashorn/src/jdk/nashorn/internal/objects/NativeError.java
@@ -92,10 +92,6 @@
     // initialized by nasgen
     private static PropertyMap $nasgenmap$;
 
-    static PropertyMap getInitialMap() {
-        return $nasgenmap$;
-    }
-
     @SuppressWarnings("LeakingThisInConstructor")
     private NativeError(final Object msg, final ScriptObject proto, final PropertyMap map) {
         super(proto, map);
@@ -108,7 +104,7 @@
     }
 
     NativeError(final Object msg, final Global global) {
-        this(msg, global.getErrorPrototype(), getInitialMap());
+        this(msg, global.getErrorPrototype(), $nasgenmap$);
     }
 
     private NativeError(final Object msg) {
diff --git a/nashorn/src/jdk/nashorn/internal/objects/NativeEvalError.java b/nashorn/src/jdk/nashorn/internal/objects/NativeEvalError.java
index bb11ef6..2b343ed 100644
--- a/nashorn/src/jdk/nashorn/internal/objects/NativeEvalError.java
+++ b/nashorn/src/jdk/nashorn/internal/objects/NativeEvalError.java
@@ -62,10 +62,6 @@
     // initialized by nasgen
     private static PropertyMap $nasgenmap$;
 
-    static PropertyMap getInitialMap() {
-        return $nasgenmap$;
-    }
-
     @SuppressWarnings("LeakingThisInConstructor")
     private NativeEvalError(final Object msg, final ScriptObject proto, final PropertyMap map) {
         super(proto, map);
@@ -78,7 +74,7 @@
     }
 
     NativeEvalError(final Object msg, final Global global) {
-        this(msg, global.getEvalErrorPrototype(), getInitialMap());
+        this(msg, global.getEvalErrorPrototype(), $nasgenmap$);
     }
 
     private NativeEvalError(final Object msg) {
diff --git a/nashorn/src/jdk/nashorn/internal/objects/NativeJSAdapter.java b/nashorn/src/jdk/nashorn/internal/objects/NativeJSAdapter.java
index c77b2fe..b71b427 100644
--- a/nashorn/src/jdk/nashorn/internal/objects/NativeJSAdapter.java
+++ b/nashorn/src/jdk/nashorn/internal/objects/NativeJSAdapter.java
@@ -146,10 +146,6 @@
     // initialized by nasgen
     private static PropertyMap $nasgenmap$;
 
-    static PropertyMap getInitialMap() {
-        return $nasgenmap$;
-    }
-
     NativeJSAdapter(final Object overrides, final ScriptObject adaptee, final ScriptObject proto, final PropertyMap map) {
         super(proto, map);
         this.adaptee = wrapAdaptee(adaptee);
@@ -577,7 +573,7 @@
             proto = global.getJSAdapterPrototype();
         }
 
-        return new NativeJSAdapter(overrides, (ScriptObject)adaptee, (ScriptObject)proto, getInitialMap());
+        return new NativeJSAdapter(overrides, (ScriptObject)adaptee, (ScriptObject)proto, $nasgenmap$);
     }
 
     @Override
@@ -622,7 +618,7 @@
         case "getMethod":
             final FindProperty find = adaptee.findProperty(__call__, true);
             if (find != null) {
-                final Object value = getObjectValue(find);
+                final Object value = find.getObjectValue();
                 if (value instanceof ScriptFunction) {
                     final ScriptFunctionImpl func = (ScriptFunctionImpl)value;
                     // TODO: It's a shame we need to produce a function bound to this and name, when we'd only need it bound
@@ -691,7 +687,7 @@
         final MethodType type = desc.getMethodType();
         if (findData != null) {
             final String name = desc.getNameTokenCount() > 2 ? desc.getNameToken(2) : null;
-            final Object value = getObjectValue(findData);
+            final Object value = findData.getObjectValue();
             if (value instanceof ScriptFunction) {
                 final ScriptFunction func = (ScriptFunction)value;
 
diff --git a/nashorn/src/jdk/nashorn/internal/objects/NativeJavaImporter.java b/nashorn/src/jdk/nashorn/internal/objects/NativeJavaImporter.java
index c86f305..49be8a7 100644
--- a/nashorn/src/jdk/nashorn/internal/objects/NativeJavaImporter.java
+++ b/nashorn/src/jdk/nashorn/internal/objects/NativeJavaImporter.java
@@ -60,17 +60,13 @@
     // initialized by nasgen
     private static PropertyMap $nasgenmap$;
 
-    static PropertyMap getInitialMap() {
-        return $nasgenmap$;
-    }
-
     private NativeJavaImporter(final Object[] args, final ScriptObject proto, final PropertyMap map) {
         super(proto, map);
         this.args = args;
     }
 
     private NativeJavaImporter(final Object[] args, final Global global) {
-        this(args, global.getJavaImporterPrototype(), getInitialMap());
+        this(args, global.getJavaImporterPrototype(), $nasgenmap$);
     }
 
     private NativeJavaImporter(final Object[] args) {
diff --git a/nashorn/src/jdk/nashorn/internal/objects/NativeNumber.java b/nashorn/src/jdk/nashorn/internal/objects/NativeNumber.java
index 09289a0..4181d20 100644
--- a/nashorn/src/jdk/nashorn/internal/objects/NativeNumber.java
+++ b/nashorn/src/jdk/nashorn/internal/objects/NativeNumber.java
@@ -34,6 +34,7 @@
 
 import java.lang.invoke.MethodHandle;
 import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodType;
 import java.text.NumberFormat;
 import java.util.Locale;
 import jdk.internal.dynalink.linker.GuardedInvocation;
@@ -57,7 +58,10 @@
 @ScriptClass("Number")
 public final class NativeNumber extends ScriptObject {
 
-    static final MethodHandle WRAPFILTER = findWrapFilter();
+    // Method handle to create an object wrapper for a primitive number
+    private static final MethodHandle WRAPFILTER = findOwnMH("wrapFilter", MH.type(NativeNumber.class, Object.class));
+    // Method handle to retrieve the Number prototype object
+    private static final MethodHandle PROTOFILTER = findOwnMH("protoFilter", MH.type(Object.class, Object.class));
 
     /** ECMA 15.7.3.2 largest positive finite value */
     @Property(attributes = Attribute.NON_ENUMERABLE_CONSTANT, where = Where.CONSTRUCTOR)
@@ -86,10 +90,6 @@
     // initialized by nasgen
     private static PropertyMap $nasgenmap$;
 
-    static PropertyMap getInitialMap() {
-        return $nasgenmap$;
-    }
-
     private NativeNumber(final double value, final ScriptObject proto, final PropertyMap map) {
         super(proto, map);
         this.value = value;
@@ -98,7 +98,7 @@
     }
 
     NativeNumber(final double value, final Global global) {
-        this(value, global.getNumberPrototype(), getInitialMap());
+        this(value, global.getNumberPrototype(), $nasgenmap$);
     }
 
     private NativeNumber(final double value) {
@@ -322,7 +322,7 @@
      * @return Link to be invoked at call site.
      */
     public static GuardedInvocation lookupPrimitive(final LinkRequest request, final Object receiver) {
-        return PrimitiveLookup.lookupPrimitive(request, Number.class, new NativeNumber(((Number)receiver).doubleValue()), WRAPFILTER);
+        return PrimitiveLookup.lookupPrimitive(request, Number.class, new NativeNumber(((Number)receiver).doubleValue()), WRAPFILTER, PROTOFILTER);
     }
 
     @SuppressWarnings("unused")
@@ -330,6 +330,11 @@
         return new NativeNumber(((Number)receiver).doubleValue());
     }
 
+    @SuppressWarnings("unused")
+    private static Object protoFilter(final Object object) {
+        return Global.instance().getNumberPrototype();
+    }
+
     private static double getNumberValue(final Object self) {
         if (self instanceof Number) {
             return ((Number)self).doubleValue();
@@ -378,7 +383,7 @@
         return str;
     }
 
-    private static MethodHandle findWrapFilter() {
-        return MH.findStatic(MethodHandles.lookup(), NativeNumber.class, "wrapFilter", MH.type(NativeNumber.class, Object.class));
+    private static MethodHandle findOwnMH(final String name, final MethodType type) {
+        return MH.findStatic(MethodHandles.lookup(), NativeNumber.class, name, type);
     }
 }
diff --git a/nashorn/src/jdk/nashorn/internal/objects/NativeRangeError.java b/nashorn/src/jdk/nashorn/internal/objects/NativeRangeError.java
index 6e0d954..4b2bebc 100644
--- a/nashorn/src/jdk/nashorn/internal/objects/NativeRangeError.java
+++ b/nashorn/src/jdk/nashorn/internal/objects/NativeRangeError.java
@@ -62,10 +62,6 @@
     // initialized by nasgen
     private static PropertyMap $nasgenmap$;
 
-    static PropertyMap getInitialMap() {
-        return $nasgenmap$;
-    }
-
     @SuppressWarnings("LeakingThisInConstructor")
     private NativeRangeError(final Object msg, final ScriptObject proto, final PropertyMap map) {
         super(proto, map);
@@ -78,7 +74,7 @@
     }
 
     NativeRangeError(final Object msg, final Global global) {
-        this(msg, global.getRangeErrorPrototype(), getInitialMap());
+        this(msg, global.getRangeErrorPrototype(), $nasgenmap$);
     }
 
     private NativeRangeError(final Object msg) {
diff --git a/nashorn/src/jdk/nashorn/internal/objects/NativeReferenceError.java b/nashorn/src/jdk/nashorn/internal/objects/NativeReferenceError.java
index 052950c..504f16e 100644
--- a/nashorn/src/jdk/nashorn/internal/objects/NativeReferenceError.java
+++ b/nashorn/src/jdk/nashorn/internal/objects/NativeReferenceError.java
@@ -62,10 +62,6 @@
     // initialized by nasgen
     private static PropertyMap $nasgenmap$;
 
-    static PropertyMap getInitialMap() {
-        return $nasgenmap$;
-    }
-
     @SuppressWarnings("LeakingThisInConstructor")
     private NativeReferenceError(final Object msg, final ScriptObject proto, final PropertyMap map) {
         super(proto, map);
@@ -78,7 +74,7 @@
     }
 
     NativeReferenceError(final Object msg, final Global global) {
-        this(msg, global.getReferenceErrorPrototype(), getInitialMap());
+        this(msg, global.getReferenceErrorPrototype(), $nasgenmap$);
     }
 
     private NativeReferenceError(final Object msg) {
diff --git a/nashorn/src/jdk/nashorn/internal/objects/NativeRegExp.java b/nashorn/src/jdk/nashorn/internal/objects/NativeRegExp.java
index abc3366..04b828b 100644
--- a/nashorn/src/jdk/nashorn/internal/objects/NativeRegExp.java
+++ b/nashorn/src/jdk/nashorn/internal/objects/NativeRegExp.java
@@ -70,12 +70,8 @@
     // initialized by nasgen
     private static PropertyMap $nasgenmap$;
 
-    static PropertyMap getInitialMap() {
-        return $nasgenmap$;
-    }
-
     private NativeRegExp(final Global global) {
-        super(global.getRegExpPrototype(), getInitialMap());
+        super(global.getRegExpPrototype(), $nasgenmap$);
         this.globalObject = global;
     }
 
diff --git a/nashorn/src/jdk/nashorn/internal/objects/NativeRegExpExecResult.java b/nashorn/src/jdk/nashorn/internal/objects/NativeRegExpExecResult.java
index 5d79699..f12cea1 100644
--- a/nashorn/src/jdk/nashorn/internal/objects/NativeRegExpExecResult.java
+++ b/nashorn/src/jdk/nashorn/internal/objects/NativeRegExpExecResult.java
@@ -53,12 +53,8 @@
     // initialized by nasgen
     private static PropertyMap $nasgenmap$;
 
-    static PropertyMap getInitialMap() {
-        return $nasgenmap$;
-    }
-
     NativeRegExpExecResult(final RegExpResult result, final Global global) {
-        super(global.getArrayPrototype(), getInitialMap());
+        super(global.getArrayPrototype(), $nasgenmap$);
         setIsArray();
         this.setArray(ArrayData.allocate(result.getGroups().clone()));
         this.index = result.getIndex();
diff --git a/nashorn/src/jdk/nashorn/internal/objects/NativeString.java b/nashorn/src/jdk/nashorn/internal/objects/NativeString.java
index 2370f51..c75b2b0 100644
--- a/nashorn/src/jdk/nashorn/internal/objects/NativeString.java
+++ b/nashorn/src/jdk/nashorn/internal/objects/NativeString.java
@@ -32,6 +32,7 @@
 
 import java.lang.invoke.MethodHandle;
 import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodType;
 import java.text.Collator;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -69,21 +70,20 @@
 
     private final CharSequence value;
 
-    static final MethodHandle WRAPFILTER = findWrapFilter();
+    // Method handle to create an object wrapper for a primitive string
+    private static final MethodHandle WRAPFILTER = findOwnMH("wrapFilter", MH.type(NativeString.class, Object.class));
+    // Method handle to retrieve the String prototype object
+    private static final MethodHandle PROTOFILTER = findOwnMH("protoFilter", MH.type(Object.class, Object.class));
 
     // initialized by nasgen
     private static PropertyMap $nasgenmap$;
 
-    static PropertyMap getInitialMap() {
-        return $nasgenmap$;
-    }
-
     private NativeString(final CharSequence value) {
         this(value, Global.instance());
     }
 
     NativeString(final CharSequence value, final Global global) {
-        this(value, global.getStringPrototype(), getInitialMap());
+        this(value, global.getStringPrototype(), $nasgenmap$);
     }
 
     private NativeString(final CharSequence value, final ScriptObject proto, final PropertyMap map) {
@@ -1199,7 +1199,7 @@
      */
     public static GuardedInvocation lookupPrimitive(final LinkRequest request, final Object receiver) {
         final MethodHandle guard = NashornGuards.getInstanceOf2Guard(String.class, ConsString.class);
-        return PrimitiveLookup.lookupPrimitive(request, guard, new NativeString((CharSequence)receiver), WRAPFILTER);
+        return PrimitiveLookup.lookupPrimitive(request, guard, new NativeString((CharSequence)receiver), WRAPFILTER, PROTOFILTER);
     }
 
     @SuppressWarnings("unused")
@@ -1207,6 +1207,11 @@
         return new NativeString((CharSequence)receiver);
     }
 
+    @SuppressWarnings("unused")
+    private static Object protoFilter(final Object object) {
+        return Global.instance().getStringPrototype();
+    }
+
     private static CharSequence getCharSequence(final Object self) {
         if (self instanceof String || self instanceof ConsString) {
             return (CharSequence)self;
@@ -1254,7 +1259,7 @@
         return key >= 0 && key < value.length();
     }
 
-    private static MethodHandle findWrapFilter() {
-        return MH.findStatic(MethodHandles.lookup(), NativeString.class, "wrapFilter", MH.type(NativeString.class, Object.class));
+    private static MethodHandle findOwnMH(final String name, final MethodType type) {
+        return MH.findStatic(MethodHandles.lookup(), NativeString.class, name, type);
     }
 }
diff --git a/nashorn/src/jdk/nashorn/internal/objects/NativeSyntaxError.java b/nashorn/src/jdk/nashorn/internal/objects/NativeSyntaxError.java
index ffe1b0a..6515f3c 100644
--- a/nashorn/src/jdk/nashorn/internal/objects/NativeSyntaxError.java
+++ b/nashorn/src/jdk/nashorn/internal/objects/NativeSyntaxError.java
@@ -62,13 +62,9 @@
     // initialized by nasgen
     private static PropertyMap $nasgenmap$;
 
-    static PropertyMap getInitialMap() {
-        return $nasgenmap$;
-    }
-
     @SuppressWarnings("LeakingThisInConstructor")
     NativeSyntaxError(final Object msg, final Global global) {
-        super(global.getSyntaxErrorPrototype(), getInitialMap());
+        super(global.getSyntaxErrorPrototype(), $nasgenmap$);
         if (msg != UNDEFINED) {
             this.instMessage = JSType.toString(msg);
         } else {
diff --git a/nashorn/src/jdk/nashorn/internal/objects/NativeTypeError.java b/nashorn/src/jdk/nashorn/internal/objects/NativeTypeError.java
index 067139c..f799b17 100644
--- a/nashorn/src/jdk/nashorn/internal/objects/NativeTypeError.java
+++ b/nashorn/src/jdk/nashorn/internal/objects/NativeTypeError.java
@@ -62,13 +62,9 @@
     // initialized by nasgen
     private static PropertyMap $nasgenmap$;
 
-    static PropertyMap getInitialMap() {
-        return $nasgenmap$;
-    }
-
     @SuppressWarnings("LeakingThisInConstructor")
     NativeTypeError(final Object msg, final Global global) {
-        super(global.getTypeErrorPrototype(), getInitialMap());
+        super(global.getTypeErrorPrototype(), $nasgenmap$);
         if (msg != UNDEFINED) {
             this.instMessage = JSType.toString(msg);
         } else {
diff --git a/nashorn/src/jdk/nashorn/internal/objects/NativeURIError.java b/nashorn/src/jdk/nashorn/internal/objects/NativeURIError.java
index 382e23f..fd59bc8 100644
--- a/nashorn/src/jdk/nashorn/internal/objects/NativeURIError.java
+++ b/nashorn/src/jdk/nashorn/internal/objects/NativeURIError.java
@@ -61,13 +61,9 @@
     // initialized by nasgen
     private static PropertyMap $nasgenmap$;
 
-    static PropertyMap getInitialMap() {
-        return $nasgenmap$;
-    }
-
     @SuppressWarnings("LeakingThisInConstructor")
     NativeURIError(final Object msg, final Global global) {
-        super(global.getURIErrorPrototype(), getInitialMap());
+        super(global.getURIErrorPrototype(), $nasgenmap$);
         if (msg != UNDEFINED) {
             this.instMessage = JSType.toString(msg);
         } else {
diff --git a/nashorn/src/jdk/nashorn/internal/objects/PrototypeObject.java b/nashorn/src/jdk/nashorn/internal/objects/PrototypeObject.java
index 1fd4f60..483f617 100644
--- a/nashorn/src/jdk/nashorn/internal/objects/PrototypeObject.java
+++ b/nashorn/src/jdk/nashorn/internal/objects/PrototypeObject.java
@@ -57,10 +57,6 @@
         map$ = PropertyMap.newMap(properties);
     }
 
-    static PropertyMap getInitialMap() {
-        return map$;
-    }
-
     private PrototypeObject(final Global global, final PropertyMap map) {
         super(global.getObjectPrototype(), map != map$? map.addAll(map$) : map$);
     }
diff --git a/nashorn/src/jdk/nashorn/internal/objects/ScriptFunctionImpl.java b/nashorn/src/jdk/nashorn/internal/objects/ScriptFunctionImpl.java
index 9852c96..dcbc7da 100644
--- a/nashorn/src/jdk/nashorn/internal/objects/ScriptFunctionImpl.java
+++ b/nashorn/src/jdk/nashorn/internal/objects/ScriptFunctionImpl.java
@@ -55,27 +55,11 @@
     // property map for non-strict, non-bound functions.
     private static final PropertyMap map$;
 
-    static PropertyMap getInitialMap() {
-        return map$;
-    }
-
-    static PropertyMap getInitialAnonymousMap() {
-        return AnonymousFunction.getInitialMap();
-    }
-
-    static PropertyMap getInitialStrictMap() {
-        return strictmodemap$;
-    }
-
-    static PropertyMap getInitialBoundMap() {
-        return boundfunctionmap$;
-    }
-
     // Marker object for lazily initialized prototype object
     private static final Object LAZY_PROTOTYPE = new Object();
 
     private ScriptFunctionImpl(final String name, final MethodHandle invokeHandle, final MethodHandle[] specs, final Global global) {
-        super(name, invokeHandle, getInitialMap(), null, specs, false, true, true);
+        super(name, invokeHandle, map$, null, specs, ScriptFunctionData.IS_BUILTIN_CONSTRUCTOR);
         init(global);
     }
 
@@ -92,7 +76,7 @@
     }
 
     private ScriptFunctionImpl(final String name, final MethodHandle invokeHandle, final PropertyMap map, final MethodHandle[] specs, final Global global) {
-        super(name, invokeHandle, map.addAll(getInitialMap()), null, specs, false, true, true);
+        super(name, invokeHandle, map.addAll(map$), null, specs, ScriptFunctionData.IS_BUILTIN_CONSTRUCTOR);
         init(global);
     }
 
@@ -109,8 +93,8 @@
         this(name, invokeHandle, map, specs, Global.instance());
     }
 
-    private ScriptFunctionImpl(final String name, final MethodHandle methodHandle, final ScriptObject scope, final MethodHandle[] specs, final boolean isStrict, final boolean isBuiltin, final boolean isConstructor, final Global global) {
-        super(name, methodHandle, getMap(global, isStrict), scope, specs, isStrict, isBuiltin, isConstructor);
+    private ScriptFunctionImpl(final String name, final MethodHandle methodHandle, final ScriptObject scope, final MethodHandle[] specs, final int flags, final Global global) {
+        super(name, methodHandle, getMap(isStrict(flags)), scope, specs, flags);
         init(global);
     }
 
@@ -121,16 +105,14 @@
      * @param methodHandle handle for invocation
      * @param scope scope object
      * @param specs specialized versions of this method, if available, null otherwise
-     * @param isStrict are we in strict mode
-     * @param isBuiltin is this a built-in function
-     * @param isConstructor can the function be used as a constructor (most can; some built-ins are restricted).
+     * @param flags {@link ScriptFunctionData} flags
      */
-    ScriptFunctionImpl(final String name, final MethodHandle methodHandle, final ScriptObject scope, final MethodHandle[] specs, final boolean isStrict, final boolean isBuiltin, final boolean isConstructor) {
-        this(name, methodHandle, scope, specs, isStrict, isBuiltin, isConstructor, Global.instance());
+    ScriptFunctionImpl(final String name, final MethodHandle methodHandle, final ScriptObject scope, final MethodHandle[] specs, final int flags) {
+        this(name, methodHandle, scope, specs, flags, Global.instance());
     }
 
     private ScriptFunctionImpl(final RecompilableScriptFunctionData data, final ScriptObject scope, final Global global) {
-        super(data, getMap(global, data.isStrict()), scope);
+        super(data, getMap(data.isStrict()), scope);
         init(global);
     }
 
@@ -150,7 +132,7 @@
      * @param global the global object
      */
     ScriptFunctionImpl(final ScriptFunctionData data, final Global global) {
-        super(data, getInitialBoundMap(), null);
+        super(data, boundfunctionmap$, null);
         init(global);
     }
 
@@ -173,9 +155,13 @@
         return newMap;
     }
 
+    private static boolean isStrict(final int flags) {
+        return (flags & ScriptFunctionData.IS_STRICT) != 0;
+    }
+
     // Choose the map based on strict mode!
-    private static PropertyMap getMap(final Global global, final boolean strict) {
-        return strict ? getInitialStrictMap() : getInitialMap();
+    private static PropertyMap getMap(final boolean strict) {
+        return strict ? strictmodemap$ : map$;
     }
 
     private static PropertyMap createBoundFunctionMap(final PropertyMap strictModeMap) {
@@ -189,12 +175,8 @@
     private static class AnonymousFunction extends ScriptFunctionImpl {
         private static final PropertyMap anonmap$ = PropertyMap.newMap();
 
-        static PropertyMap getInitialMap() {
-            return anonmap$;
-        }
-
         AnonymousFunction(final Global global) {
-            super("", GlobalFunctions.ANONYMOUS, getInitialAnonymousMap(), null);
+            super("", GlobalFunctions.ANONYMOUS, anonmap$, null);
         }
     }
 
@@ -211,7 +193,7 @@
      * @return new ScriptFunction
      */
     static ScriptFunction makeFunction(final String name, final MethodHandle methodHandle, final MethodHandle[] specs) {
-        final ScriptFunctionImpl func = new ScriptFunctionImpl(name, methodHandle, null, specs, false, true, false);
+        final ScriptFunctionImpl func = new ScriptFunctionImpl(name, methodHandle, null, specs, ScriptFunctionData.IS_BUILTIN);
         func.setPrototype(UNDEFINED);
         // Non-constructor built-in functions do not have "prototype" property
         func.deleteOwnProperty(func.getMap().findProperty("prototype"));
diff --git a/nashorn/src/jdk/nashorn/internal/parser/Parser.java b/nashorn/src/jdk/nashorn/internal/parser/Parser.java
index 60cbacc..f6b962a 100644
--- a/nashorn/src/jdk/nashorn/internal/parser/Parser.java
+++ b/nashorn/src/jdk/nashorn/internal/parser/Parser.java
@@ -1799,6 +1799,7 @@
         case THIS:
             final String name = type.getName();
             next();
+            lc.setFlag(lc.getCurrentFunction(), FunctionNode.USES_THIS);
             return new IdentNode(primaryToken, finish, name);
         case IDENT:
             final IdentNode ident = getIdent();
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/AccessorProperty.java b/nashorn/src/jdk/nashorn/internal/runtime/AccessorProperty.java
index 702ca76..d22a956 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/AccessorProperty.java
+++ b/nashorn/src/jdk/nashorn/internal/runtime/AccessorProperty.java
@@ -141,10 +141,12 @@
     private Class<?> currentType;
 
     /**
-     * Delegate constructor. This is used when adding properties to the Global scope, which
-     * is necessary for outermost levels in a script (the ScriptObject is represented by
-     * a JO-prefixed ScriptObject class, but the properties need to be in the Global scope
-     * and are thus rebound with that as receiver
+     * Delegate constructor for bound properties. This is used for properties created by
+     * {@link ScriptRuntime#mergeScope} and the Nashorn {@code Object.bindProperties} method.
+     * The former is used to add a script's defined globals to the current global scope while
+     * still storing them in a JO-prefixed ScriptObject class.
+     *
+     * <p>All properties created by this constructor have the {@link #IS_BOUND} flag set.</p>
      *
      * @param property  accessor property to rebind
      * @param delegate  delegate object to rebind receiver to
@@ -157,6 +159,8 @@
         this.objectGetter    = bindTo(property.ensureObjectGetter(), delegate);
         this.objectSetter    = bindTo(property.ensureObjectSetter(), delegate);
 
+        // Properties created this way are bound to a delegate
+        this.flags |= IS_BOUND;
         setCurrentType(property.getCurrentType());
     }
 
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/Context.java b/nashorn/src/jdk/nashorn/internal/runtime/Context.java
index 3e6a148..f3ec087 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/Context.java
+++ b/nashorn/src/jdk/nashorn/internal/runtime/Context.java
@@ -36,6 +36,8 @@
 import java.io.PrintWriter;
 import java.lang.invoke.MethodHandle;
 import java.lang.invoke.MethodHandles;
+import java.lang.ref.ReferenceQueue;
+import java.lang.ref.SoftReference;
 import java.lang.reflect.Modifier;
 import java.net.MalformedURLException;
 import java.net.URL;
@@ -46,6 +48,7 @@
 import java.security.Permissions;
 import java.security.PrivilegedAction;
 import java.security.ProtectionDomain;
+import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.concurrent.atomic.AtomicLong;
 import jdk.internal.org.objectweb.asm.ClassReader;
@@ -153,16 +156,19 @@
     /** Is Context global debug mode enabled ? */
     public static final boolean DEBUG = Options.getBooleanProperty("nashorn.debug");
 
-    private static final ThreadLocal<ScriptObject> currentGlobal = new ThreadLocal<>();
+    private static final ThreadLocal<Global> currentGlobal = new ThreadLocal<>();
+
+    // class cache
+    private ClassCache classCache;
 
     /**
      * Get the current global scope
      * @return the current global scope
      */
-    public static ScriptObject getGlobal() {
+    public static Global getGlobal() {
         // This class in a package.access protected package.
         // Trusted code only can call this method.
-        return getGlobalTrusted();
+        return currentGlobal.get();
     }
 
     /**
@@ -171,10 +177,19 @@
      */
     public static void setGlobal(final ScriptObject global) {
         if (global != null && !(global instanceof Global)) {
-            throw new IllegalArgumentException("global is not an instance of Global!");
+            throw new IllegalArgumentException("not a global!");
         }
+        setGlobal((Global)global);
+    }
 
-        setGlobalTrusted(global);
+    /**
+     * Set the current global scope
+     * @param global the global scope
+     */
+    public static void setGlobal(final Global global) {
+        // This class in a package.access protected package.
+        // Trusted code only can call this method.
+        currentGlobal.set(global);
     }
 
     /**
@@ -195,7 +210,7 @@
      * @return error writer of the current context
      */
     public static PrintWriter getCurrentErr() {
-        final ScriptObject global = getGlobalTrusted();
+        final ScriptObject global = getGlobal();
         return (global != null)? global.getContext().getErr() : new PrintWriter(System.err);
     }
 
@@ -348,6 +363,11 @@
             this.classPathLoader = null;
         }
 
+        final int cacheSize = env._class_cache_size;
+        if (cacheSize > 0) {
+            classCache = new ClassCache(cacheSize);
+        }
+
         // print version info if asked.
         if (env._version) {
             getErr().println("nashorn " + Version.version());
@@ -395,7 +415,7 @@
      * @return the property map of the current global scope
      */
     public static PropertyMap getGlobalMap() {
-        return Context.getGlobalTrusted().getMap();
+        return Context.getGlobal().getMap();
     }
 
     /**
@@ -425,7 +445,7 @@
         final String  file       = (location == UNDEFINED || location == null) ? "<eval>" : location.toString();
         final Source  source     = new Source(file, string);
         final boolean directEval = location != UNDEFINED; // is this direct 'eval' call or indirectly invoked eval?
-        final ScriptObject global = Context.getGlobalTrusted();
+        final Global  global = Context.getGlobal();
 
         ScriptObject scope = initialScope;
 
@@ -457,7 +477,7 @@
         // in the caller's environment. A new environment is created!
         if (strictFlag) {
             // Create a new scope object
-            final ScriptObject strictEvalScope = ((GlobalObject)global).newObject();
+            final ScriptObject strictEvalScope = global.newObject();
 
             // bless it as a "scope"
             strictEvalScope.setIsScope();
@@ -582,10 +602,10 @@
      * @throws IOException if source cannot be found or loaded
      */
     public Object loadWithNewGlobal(final Object from, final Object...args) throws IOException {
-        final ScriptObject oldGlobal = getGlobalTrusted();
-        final ScriptObject newGlobal = AccessController.doPrivileged(new PrivilegedAction<ScriptObject>() {
+        final Global oldGlobal = getGlobal();
+        final Global newGlobal = AccessController.doPrivileged(new PrivilegedAction<Global>() {
            @Override
-           public ScriptObject run() {
+           public Global run() {
                try {
                    return newGlobal();
                } catch (final RuntimeException e) {
@@ -598,17 +618,17 @@
         }, CREATE_GLOBAL_ACC_CTXT);
         // initialize newly created Global instance
         initGlobal(newGlobal);
-        setGlobalTrusted(newGlobal);
+        setGlobal(newGlobal);
 
         final Object[] wrapped = args == null? ScriptRuntime.EMPTY_ARRAY :  ScriptObjectMirror.wrapArray(args, oldGlobal);
-        newGlobal.put("arguments", ((GlobalObject)newGlobal).wrapAsObject(wrapped), env._strict);
+        newGlobal.put("arguments", newGlobal.wrapAsObject(wrapped), env._strict);
 
         try {
             // wrap objects from newGlobal's world as mirrors - but if result
             // is from oldGlobal's world, unwrap it!
             return ScriptObjectMirror.unwrap(ScriptObjectMirror.wrap(load(newGlobal, from), newGlobal), oldGlobal);
         } finally {
-            setGlobalTrusted(oldGlobal);
+            setGlobal(oldGlobal);
         }
     }
 
@@ -637,7 +657,7 @@
      * Checks that the given Class can be accessed from no permissions context.
      *
      * @param clazz Class object
-     * @throw SecurityException if not accessible
+     * @throws SecurityException if not accessible
      */
     public static void checkPackageAccess(final Class<?> clazz) {
         final SecurityManager sm = System.getSecurityManager();
@@ -654,12 +674,12 @@
      * Checks that the given package name can be accessed from no permissions context.
      *
      * @param pkgName package name
-     * @throw SecurityException if not accessible
+     * @throws SecurityException if not accessible
      */
     public static void checkPackageAccess(final String pkgName) {
         final SecurityManager sm = System.getSecurityManager();
         if (sm != null) {
-            checkPackageAccess(sm, pkgName.endsWith(".")? pkgName : pkgName + ".");
+            checkPackageAccess(sm, pkgName.endsWith(".") ? pkgName : pkgName + ".");
         }
     }
 
@@ -783,7 +803,7 @@
      *
      * @return the initialized global scope object.
      */
-    public ScriptObject createGlobal() {
+    public Global createGlobal() {
         return initGlobal(newGlobal());
     }
 
@@ -791,7 +811,7 @@
      * Create a new uninitialized global scope object
      * @return the global script object
      */
-    public ScriptObject newGlobal() {
+    public Global newGlobal() {
         return new Global(this);
     }
 
@@ -801,20 +821,16 @@
      * @param global the global
      * @return the initialized global scope object.
      */
-    public ScriptObject initGlobal(final ScriptObject global) {
-        if (! (global instanceof GlobalObject)) {
-            throw new IllegalArgumentException("not a global object!");
-        }
-
+    public Global initGlobal(final Global global) {
         // Need only minimal global object, if we are just compiling.
         if (!env._compile_only) {
-            final ScriptObject oldGlobal = Context.getGlobalTrusted();
+            final Global oldGlobal = Context.getGlobal();
             try {
-                Context.setGlobalTrusted(global);
+                Context.setGlobal(global);
                 // initialize global scope with builtin global objects
-                ((GlobalObject)global).initBuiltinObjects();
+                global.initBuiltinObjects();
             } finally {
-                Context.setGlobalTrusted(oldGlobal);
+                Context.setGlobal(oldGlobal);
             }
         }
 
@@ -822,30 +838,15 @@
     }
 
     /**
-     * Trusted variants - package-private
+     * Trusted variant - package-private
      */
 
     /**
-     * Return the current global scope
-     * @return current global scope
-     */
-    static ScriptObject getGlobalTrusted() {
-        return currentGlobal.get();
-    }
-
-    /**
-     * Set the current global scope
-     */
-    static void setGlobalTrusted(ScriptObject global) {
-         currentGlobal.set(global);
-    }
-
-    /**
      * Return the current global's context
      * @return current global's context
      */
     static Context getContextTrusted() {
-        return Context.getGlobalTrusted().getContext();
+        return ((ScriptObject)Context.getGlobal()).getContext();
     }
 
     /**
@@ -914,7 +915,7 @@
         }
 
         // Package as a JavaScript function and pass function back to shell.
-        return ((GlobalObject)Context.getGlobalTrusted()).newScriptFunction(RUN_SCRIPT.symbolName(), runMethodHandle, scope, strict);
+        return Context.getGlobal().newScriptFunction(RUN_SCRIPT.symbolName(), runMethodHandle, scope, strict);
     }
 
     private ScriptFunction compileScript(final Source source, final ScriptObject scope, final ErrorManager errMan) {
@@ -925,16 +926,10 @@
         // start with no errors, no warnings.
         errMan.reset();
 
-        GlobalObject global = null;
-        Class<?> script;
-
-        if (env._class_cache_size > 0) {
-            global = (GlobalObject)Context.getGlobalTrusted();
-            script = global.findCachedClass(source);
-            if (script != null) {
-                Compiler.LOG.fine("Code cache hit for ", source, " avoiding recompile.");
-                return script;
-            }
+        Class<?> script = findCachedClass(source);
+        if (script != null) {
+            Compiler.LOG.fine("Code cache hit for ", source, " avoiding recompile.");
+            return script;
         }
 
         final FunctionNode functionNode = new Parser(env, source, errMan, strict).parse();
@@ -963,10 +958,7 @@
 
         final FunctionNode newFunctionNode = compiler.compile(functionNode);
         script = compiler.install(newFunctionNode);
-
-        if (global != null) {
-            global.cacheClass(source, script);
-        }
+        cacheClass(source, script);
 
         return script;
     }
@@ -988,4 +980,60 @@
     private long getUniqueScriptId() {
         return uniqueScriptId.getAndIncrement();
     }
+
+    /**
+     * Cache for compiled script classes.
+     */
+    @SuppressWarnings("serial")
+    private static class ClassCache extends LinkedHashMap<Source, ClassReference> {
+        private final int size;
+        private final ReferenceQueue<Class<?>> queue;
+
+        ClassCache(int size) {
+            super(size, 0.75f, true);
+            this.size = size;
+            this.queue = new ReferenceQueue<>();
+        }
+
+        void cache(final Source source, final Class<?> clazz) {
+            put(source, new ClassReference(clazz, queue, source));
+        }
+
+        @Override
+        protected boolean removeEldestEntry(final Map.Entry<Source, ClassReference> eldest) {
+            return size() > size;
+        }
+
+        @Override
+        public ClassReference get(Object key) {
+            for (ClassReference ref; (ref = (ClassReference)queue.poll()) != null; ) {
+                remove(ref.source);
+            }
+            return super.get(key);
+        }
+
+    }
+
+    private static class ClassReference extends SoftReference<Class<?>> {
+        private final Source source;
+
+        ClassReference(final Class<?> clazz, final ReferenceQueue<Class<?>> queue, final Source source) {
+            super(clazz, queue);
+            this.source = source;
+        }
+    }
+
+    // Class cache management
+    private Class<?> findCachedClass(final Source source) {
+        ClassReference ref = classCache == null ? null : classCache.get(source);
+        return ref != null ? ref.get() : null;
+    }
+
+    private void cacheClass(final Source source, final Class<?> clazz) {
+        if (classCache != null) {
+            classCache.cache(source, clazz);
+        }
+    }
+
+
 }
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/DebuggerSupport.java b/nashorn/src/jdk/nashorn/internal/runtime/DebuggerSupport.java
index c288a96..261bc02 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/DebuggerSupport.java
+++ b/nashorn/src/jdk/nashorn/internal/runtime/DebuggerSupport.java
@@ -75,7 +75,7 @@
      * @return context global.
      */
     static Object getGlobal() {
-        return Context.getGlobalTrusted();
+        return Context.getGlobal();
     }
 
     /**
@@ -87,7 +87,7 @@
      * @return Result of eval as string, or, an exception or null depending on returnException.
      */
     static Object eval(final ScriptObject scope, final Object self, final String string, final boolean returnException) {
-        final ScriptObject global = Context.getGlobalTrusted();
+        final ScriptObject global = Context.getGlobal();
         final ScriptObject initialScope = scope != null ? scope : global;
         final Object callThis = self != null ? self : global;
         final Context context = global.getContext();
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/ECMAErrors.java b/nashorn/src/jdk/nashorn/internal/runtime/ECMAErrors.java
index 754ebbf..affba49 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/ECMAErrors.java
+++ b/nashorn/src/jdk/nashorn/internal/runtime/ECMAErrors.java
@@ -31,6 +31,7 @@
 import jdk.nashorn.api.scripting.NashornException;
 import jdk.nashorn.internal.scripts.JS;
 import jdk.nashorn.internal.codegen.CompilerConstants;
+import jdk.nashorn.internal.objects.Global;
 
 /**
  * Helper class to throw various standard "ECMA error" exceptions such as Error, ReferenceError, TypeError etc.
@@ -66,7 +67,7 @@
      * @return the resulting {@link ECMAException}
      */
     public static ECMAException asEcmaException(final ParserException e) {
-        return asEcmaException(Context.getGlobalTrusted(), e);
+        return asEcmaException(Context.getGlobal(), e);
     }
 
     /**
@@ -78,11 +79,11 @@
      *
      * @return the resulting {@link ECMAException}
      */
-    public static ECMAException asEcmaException(final ScriptObject global, final ParserException e) {
+    public static ECMAException asEcmaException(final Global global, final ParserException e) {
         final JSErrorType errorType = e.getErrorType();
         assert errorType != null : "error type for " + e + " was null";
 
-        final GlobalObject globalObj = (GlobalObject)global;
+        final Global globalObj    = global;
         final String       msg    = e.getMessage();
 
         // translate to ECMAScript Error object using error type
@@ -116,7 +117,7 @@
      * @return the resulting {@link ECMAException}
      */
     public static ECMAException syntaxError(final String msgId, final String... args) {
-        return syntaxError(Context.getGlobalTrusted(), msgId, args);
+        return syntaxError(Context.getGlobal(), msgId, args);
     }
 
     /**
@@ -128,7 +129,7 @@
      *
      * @return the resulting {@link ECMAException}
      */
-    public static ECMAException syntaxError(final ScriptObject global, final String msgId, final String... args) {
+    public static ECMAException syntaxError(final Global global, final String msgId, final String... args) {
         return syntaxError(global, null, msgId, args);
     }
 
@@ -142,7 +143,7 @@
      * @return the resulting {@link ECMAException}
      */
     public static ECMAException syntaxError(final Throwable cause, final String msgId, final String... args) {
-        return syntaxError(Context.getGlobalTrusted(), cause, msgId, args);
+        return syntaxError(Context.getGlobal(), cause, msgId, args);
     }
 
     /**
@@ -155,9 +156,9 @@
      *
      * @return the resulting {@link ECMAException}
      */
-    public static ECMAException syntaxError(final ScriptObject global, final Throwable cause, final String msgId, final String... args) {
+    public static ECMAException syntaxError(final Global global, final Throwable cause, final String msgId, final String... args) {
         final String msg = getMessage("syntax.error." + msgId, args);
-        return error(((GlobalObject)global).newSyntaxError(msg), cause);
+        return error(global.newSyntaxError(msg), cause);
     }
 
     /**
@@ -169,7 +170,7 @@
      * @return the resulting {@link ECMAException}
      */
     public static ECMAException typeError(final String msgId, final String... args) {
-        return typeError(Context.getGlobalTrusted(), msgId, args);
+        return typeError(Context.getGlobal(), msgId, args);
     }
 
     /**
@@ -181,7 +182,7 @@
      *
      * @return the resulting {@link ECMAException}
      */
-    public static ECMAException typeError(final ScriptObject global, final String msgId, final String... args) {
+    public static ECMAException typeError(final Global global, final String msgId, final String... args) {
         return typeError(global, null, msgId, args);
     }
 
@@ -195,7 +196,7 @@
      * @return the resulting {@link ECMAException}
      */
     public static ECMAException typeError(final Throwable cause, final String msgId, final String... args) {
-        return typeError(Context.getGlobalTrusted(), cause, msgId, args);
+        return typeError(Context.getGlobal(), cause, msgId, args);
     }
 
     /**
@@ -208,9 +209,9 @@
      *
      * @return the resulting {@link ECMAException}
      */
-    public static ECMAException typeError(final ScriptObject global, final Throwable cause, final String msgId, final String... args) {
+    public static ECMAException typeError(final Global global, final Throwable cause, final String msgId, final String... args) {
         final String msg = getMessage("type.error." + msgId, args);
-        return error(((GlobalObject)global).newTypeError(msg), cause);
+        return error(global.newTypeError(msg), cause);
     }
 
     /**
@@ -222,7 +223,7 @@
      * @return the resulting {@link ECMAException}
      */
     public static ECMAException rangeError(final String msgId, final String... args) {
-        return rangeError(Context.getGlobalTrusted(), msgId, args);
+        return rangeError(Context.getGlobal(), msgId, args);
     }
 
     /**
@@ -234,7 +235,7 @@
      *
      * @return the resulting {@link ECMAException}
      */
-    public static ECMAException rangeError(final ScriptObject global, final String msgId, final String... args) {
+    public static ECMAException rangeError(final Global global, final String msgId, final String... args) {
         return rangeError(global, null, msgId, args);
     }
 
@@ -248,7 +249,7 @@
      * @return the resulting {@link ECMAException}
      */
     public static ECMAException rangeError(final Throwable cause, final String msgId, final String... args) {
-        return rangeError(Context.getGlobalTrusted(), cause, msgId, args);
+        return rangeError(Context.getGlobal(), cause, msgId, args);
     }
 
     /**
@@ -261,9 +262,9 @@
      *
      * @return the resulting {@link ECMAException}
      */
-    public static ECMAException rangeError(final ScriptObject global, final Throwable cause, final String msgId, final String... args) {
+    public static ECMAException rangeError(final Global global, final Throwable cause, final String msgId, final String... args) {
         final String msg = getMessage("range.error." + msgId, args);
-        return error(((GlobalObject)global).newRangeError(msg), cause);
+        return error(global.newRangeError(msg), cause);
     }
 
     /**
@@ -275,7 +276,7 @@
      * @return the resulting {@link ECMAException}
      */
     public static ECMAException referenceError(final String msgId, final String... args) {
-        return referenceError(Context.getGlobalTrusted(), msgId, args);
+        return referenceError(Context.getGlobal(), msgId, args);
     }
 
     /**
@@ -287,7 +288,7 @@
      *
      * @return the resulting {@link ECMAException}
      */
-    public static ECMAException referenceError(final ScriptObject global, final String msgId, final String... args) {
+    public static ECMAException referenceError(final Global global, final String msgId, final String... args) {
         return referenceError(global, null, msgId, args);
     }
 
@@ -301,7 +302,7 @@
      * @return the resulting {@link ECMAException}
      */
     public static ECMAException referenceError(final Throwable cause, final String msgId, final String... args) {
-        return referenceError(Context.getGlobalTrusted(), cause, msgId, args);
+        return referenceError(Context.getGlobal(), cause, msgId, args);
     }
 
     /**
@@ -314,9 +315,9 @@
      *
      * @return the resulting {@link ECMAException}
      */
-    public static ECMAException referenceError(final ScriptObject global, final Throwable cause, final String msgId, final String... args) {
+    public static ECMAException referenceError(final Global global, final Throwable cause, final String msgId, final String... args) {
         final String msg = getMessage("reference.error." + msgId, args);
-        return error(((GlobalObject)global).newReferenceError(msg), cause);
+        return error(global.newReferenceError(msg), cause);
     }
 
     /**
@@ -328,7 +329,7 @@
      * @return the resulting {@link ECMAException}
      */
     public static ECMAException uriError(final String msgId, final String... args) {
-        return uriError(Context.getGlobalTrusted(), msgId, args);
+        return uriError(Context.getGlobal(), msgId, args);
     }
 
     /**
@@ -340,7 +341,7 @@
      *
      * @return the resulting {@link ECMAException}
      */
-    public static ECMAException uriError(final ScriptObject global, final String msgId, final String... args) {
+    public static ECMAException uriError(final Global global, final String msgId, final String... args) {
         return uriError(global, null, msgId, args);
     }
 
@@ -354,7 +355,7 @@
      * @return the resulting {@link ECMAException}
      */
     public static ECMAException uriError(final Throwable cause, final String msgId, final String... args) {
-        return uriError(Context.getGlobalTrusted(), cause, msgId, args);
+        return uriError(Context.getGlobal(), cause, msgId, args);
     }
 
     /**
@@ -367,9 +368,9 @@
      *
      * @return the resulting {@link ECMAException}
      */
-    public static ECMAException uriError(final ScriptObject global, final Throwable cause, final String msgId, final String... args) {
+    public static ECMAException uriError(final Global global, final Throwable cause, final String msgId, final String... args) {
         final String msg = getMessage("uri.error." + msgId, args);
-        return error(((GlobalObject)global).newURIError(msg), cause);
+        return error(global.newURIError(msg), cause);
     }
 
     /**
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/FinalScriptFunctionData.java b/nashorn/src/jdk/nashorn/internal/runtime/FinalScriptFunctionData.java
index c7a410e..f16cf41 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/FinalScriptFunctionData.java
+++ b/nashorn/src/jdk/nashorn/internal/runtime/FinalScriptFunctionData.java
@@ -38,31 +38,27 @@
     /**
      * Constructor - used for bind
      *
-     * @param name          name
-     * @param arity         arity
-     * @param functions     precompiled code
-     * @param isStrict      strict
-     * @param isBuiltin     builtin
-     * @param isConstructor constructor
+     * @param name      name
+     * @param arity     arity
+     * @param functions precompiled code
+     * @param flags     {@link ScriptFunctionData} flags
      */
-    FinalScriptFunctionData(final String name, int arity, CompiledFunctions functions, final boolean isStrict, final boolean isBuiltin, final boolean isConstructor) {
-        super(name, arity, isStrict, isBuiltin, isConstructor);
+    FinalScriptFunctionData(final String name, final int arity, final CompiledFunctions functions, final int flags) {
+        super(name, arity, flags);
         code.addAll(functions);
     }
 
     /**
-     * Constructor - used from ScriptFunction. This assumes that we have code alraedy for the
+     * Constructor - used from ScriptFunction. This assumes that we have code already for the
      * method (typically a native method) and possibly specializations.
      *
-     * @param name           name
-     * @param mh             method handle for generic version of method
-     * @param specs          specializations
-     * @param isStrict       strict
-     * @param isBuiltin      builtin
-     * @param isConstructor  constructor
+     * @param name  name
+     * @param mh    method handle for generic version of method
+     * @param specs specializations
+     * @param flags {@link ScriptFunctionData} flags
      */
-    FinalScriptFunctionData(final String name, final MethodHandle mh, final MethodHandle[] specs, final boolean isStrict, final boolean isBuiltin, final boolean isConstructor) {
-        super(name, arity(mh), isStrict, isBuiltin, isConstructor);
+    FinalScriptFunctionData(final String name, final MethodHandle mh, final MethodHandle[] specs, final int flags) {
+        super(name, arity(mh), flags);
 
         addInvoker(mh);
         if (specs != null) {
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/GlobalObject.java b/nashorn/src/jdk/nashorn/internal/runtime/GlobalObject.java
deleted file mode 100644
index 3779f3b..0000000
--- a/nashorn/src/jdk/nashorn/internal/runtime/GlobalObject.java
+++ /dev/null
@@ -1,244 +0,0 @@
-/*
- * Copyright (c) 2010, 2013, 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 jdk.nashorn.internal.runtime;
-
-import java.lang.invoke.MethodHandle;
-import java.util.concurrent.Callable;
-import jdk.internal.dynalink.linker.GuardedInvocation;
-import jdk.internal.dynalink.linker.LinkRequest;
-import jdk.nashorn.internal.runtime.linker.InvokeByName;
-
-/**
- * Runtime interface to the global scope objects.
- */
-
-public interface GlobalObject {
-    /**
-     * Is this global of the given Context?
-     * @param ctxt the context
-     * @return true if this global belongs to the given Context
-     */
-    public boolean isOfContext(final Context ctxt);
-
-    /**
-     * Does this global belong to a strict Context?
-     * @return true if this global belongs to a strict Context
-     */
-    public boolean isStrictContext();
-
-    /**
-     * Initialize standard builtin objects like "Object", "Array", "Function" etc.
-     * as well as our extension builtin objects like "Java", "JSAdapter" as properties
-     * of the global scope object.
-     */
-    public void initBuiltinObjects();
-
-    /**
-     * Wrapper for {@link jdk.nashorn.internal.objects.Global#newScriptFunction(String, MethodHandle, ScriptObject, boolean)}
-     *
-     * @param name   function name
-     * @param handle invocation handle for function
-     * @param scope  the scope
-     * @param strict are we in strict mode
-     *
-     * @return new script function
-     */
-   public ScriptFunction newScriptFunction(String name, MethodHandle handle, ScriptObject scope, boolean strict);
-
-    /**
-     * Wrapper for {@link jdk.nashorn.internal.objects.Global#wrapAsObject(Object)}
-     *
-     * @param obj object to wrap
-     * @return    wrapped object
-     */
-   public Object wrapAsObject(Object obj);
-
-
-    /**
-     * Wrapper for {@link jdk.nashorn.internal.objects.Global#primitiveLookup(LinkRequest, Object)}
-     *
-     * @param request the link request for the dynamic call site.
-     * @param self     self reference
-     *
-     * @return guarded invocation
-     */
-   public GuardedInvocation primitiveLookup(LinkRequest request, Object self);
-
-
-    /**
-     * Wrapper for {@link jdk.nashorn.internal.objects.Global#newObject()}
-     *
-     * @return the new ScriptObject
-     */
-   public ScriptObject newObject();
-
-    /**
-     * Wrapper for {@link jdk.nashorn.internal.objects.Global#isError(ScriptObject)}
-     *
-     * @param sobj to check if it is an error object
-     * @return true if error object
-     */
-   public boolean isError(ScriptObject sobj);
-
-    /**
-     * Wrapper for {@link jdk.nashorn.internal.objects.Global#newError(String)}
-     *
-     * @param msg the error message
-     *
-     * @return the new ScriptObject representing the error
-     */
-   public ScriptObject newError(String msg);
-
-    /**
-     * Wrapper for {@link jdk.nashorn.internal.objects.Global#newEvalError(String)}
-     *
-     * @param msg the error message
-     *
-     * @return the new ScriptObject representing the eval error
-     */
-   public ScriptObject newEvalError(String msg);
-
-    /**
-     * Wrapper for {@link jdk.nashorn.internal.objects.Global#newRangeError(String)}
-     *
-     * @param msg the error message
-     *
-     * @return the new ScriptObject representing the range error
-     */
-   public ScriptObject newRangeError(String msg);
-
-    /**
-     * Wrapper for {@link jdk.nashorn.internal.objects.Global#newReferenceError(String)}
-     *
-     * @param msg the error message
-     *
-     * @return the new ScriptObject representing the reference error
-     */
-   public ScriptObject newReferenceError(String msg);
-
-    /**
-     * Wrapper for {@link jdk.nashorn.internal.objects.Global#newSyntaxError(String)}
-     *
-     * @param msg the error message
-     *
-     * @return the new ScriptObject representing the syntax error
-     */
-   public ScriptObject newSyntaxError(String msg);
-
-    /**
-     * Wrapper for {@link jdk.nashorn.internal.objects.Global#newTypeError(String)}
-     *
-     * @param msg the error message
-     *
-     * @return the new ScriptObject representing the type error
-     */
-   public ScriptObject newTypeError(String msg);
-
-    /**
-     * Wrapper for {@link jdk.nashorn.internal.objects.Global#newURIError(String)}
-     *
-     * @param msg the error message
-     *
-     * @return the new ScriptObject representing the URI error
-     */
-    public ScriptObject newURIError(String msg);
-
-    /**
-     * Wrapper for {@link jdk.nashorn.internal.objects.Global#newGenericDescriptor(boolean, boolean)}
-     *
-     * @param configurable is the described property configurable
-     * @param enumerable   is the described property enumerable
-     *
-     * @return property descriptor
-     */
-    public PropertyDescriptor newGenericDescriptor(boolean configurable, boolean enumerable);
-
-    /**
-     * Wrapper for {@link jdk.nashorn.internal.objects.Global#newDataDescriptor(Object, boolean, boolean, boolean)}
-     *
-     * @param value        data value
-     * @param configurable is the described property configurable
-     * @param enumerable   is the described property enumerable
-     * @param writable     is the described property writable
-     *
-     * @return property descriptor
-     */
-    public PropertyDescriptor newDataDescriptor(Object value, boolean configurable, boolean enumerable, boolean writable);
-
-    /**
-     * Wrapper for {@link jdk.nashorn.internal.objects.Global#newAccessorDescriptor(Object, Object, boolean, boolean)}
-     *
-     * @param get          property getter, or null if none
-     * @param set          property setter, or null if none
-     * @param configurable is the described property configurable
-     * @param enumerable   is the described property enumerable
-     *
-     * @return property descriptor
-     */
-    public PropertyDescriptor newAccessorDescriptor(Object get, Object set, boolean configurable, boolean enumerable);
-
-    /**
-     * Wrapper for {@link jdk.nashorn.internal.objects.Global#getDefaultValue(ScriptObject, Class)}
-     *
-     * @param sobj     script object
-     * @param typeHint type hint
-     *
-     * @return default value
-     */
-    public Object getDefaultValue(ScriptObject sobj, Class<?> typeHint);
-
-    /**
-     * Find the compiled Class for the given script source, if available
-     *
-     * @param source Source object of the script
-     * @return compiled Class object or null
-     */
-    public Class<?> findCachedClass(Source source);
-
-    /**
-     * Put the Source associated Class object in the Source-to-Class cache
-     *
-     * @param source Source of the script
-     * @param clazz compiled Class object for the source
-     */
-    public void cacheClass(Source source, Class<?> clazz);
-
-    /**
-     * Get cached InvokeByName object for the given key
-     * @param key key to be associated with InvokeByName object
-     * @param creator if InvokeByName is absent 'creator' is called to make one (lazy init)
-     * @return InvokeByName object associated with the key.
-     */
-    public InvokeByName getInvokeByName(final Object key, final Callable<InvokeByName> creator);
-
-    /**
-     * Get cached dynamic method handle for the given key
-     * @param key key to be associated with dynamic method handle
-     * @param creator if method handle is absent 'creator' is called to make one (lazy init)
-     * @return dynamic method handle associated with the key.
-     */
-    public MethodHandle getDynamicInvoker(final Object key, final Callable<MethodHandle> creator);
-}
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/JSONFunctions.java b/nashorn/src/jdk/nashorn/internal/runtime/JSONFunctions.java
index 73552cb..6486318 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/JSONFunctions.java
+++ b/nashorn/src/jdk/nashorn/internal/runtime/JSONFunctions.java
@@ -33,6 +33,7 @@
 import jdk.nashorn.internal.ir.ObjectNode;
 import jdk.nashorn.internal.ir.PropertyNode;
 import jdk.nashorn.internal.ir.UnaryNode;
+import jdk.nashorn.internal.objects.Global;
 import jdk.nashorn.internal.parser.JSONParser;
 import jdk.nashorn.internal.parser.TokenType;
 import jdk.nashorn.internal.runtime.arrays.ArrayIndex;
@@ -47,7 +48,7 @@
     private static final Object REVIVER_INVOKER = new Object();
 
     private static MethodHandle getREVIVER_INVOKER() {
-        return ((GlobalObject)Context.getGlobal()).getDynamicInvoker(REVIVER_INVOKER,
+        return Context.getGlobal().getDynamicInvoker(REVIVER_INVOKER,
                 new Callable<MethodHandle>() {
                     @Override
                     public MethodHandle call() {
@@ -88,7 +89,7 @@
             throw ECMAErrors.syntaxError(e, "invalid.json", e.getMessage());
         }
 
-        final ScriptObject global = Context.getGlobalTrusted();
+        final Global global = Context.getGlobal();
         Object unfiltered = convertNode(global, node);
         return applyReviver(global, unfiltered, reviver);
     }
@@ -98,10 +99,10 @@
     // parse helpers
 
     // apply 'reviver' function if available
-    private static Object applyReviver(final ScriptObject global, final Object unfiltered, final Object reviver) {
+    private static Object applyReviver(final Global global, final Object unfiltered, final Object reviver) {
         if (reviver instanceof ScriptFunction) {
-            assert global instanceof GlobalObject;
-            final ScriptObject root = ((GlobalObject)global).newObject();
+            assert global instanceof Global;
+            final ScriptObject root = global.newObject();
             root.addOwnProperty("", Property.WRITABLE_ENUMERABLE_CONFIGURABLE, unfiltered);
             return walk(root, "", (ScriptFunction)reviver);
         }
@@ -138,8 +139,8 @@
     }
 
     // Converts IR node to runtime value
-    private static Object convertNode(final ScriptObject global, final Node node) {
-        assert global instanceof GlobalObject;
+    private static Object convertNode(final Global global, final Node node) {
+        assert global instanceof Global;
 
         if (node instanceof LiteralNode) {
             // check for array literal
@@ -157,7 +158,7 @@
                     for (final Node elem : elements) {
                         values[index++] = JSType.toNumber(convertNode(global, elem));
                     }
-                    return ((GlobalObject)global).wrapAsObject(values);
+                    return global.wrapAsObject(values);
                 }
 
                 final Object[] values = new Object[elements.length];
@@ -167,14 +168,14 @@
                     values[index++] = convertNode(global, elem);
                 }
 
-                return ((GlobalObject)global).wrapAsObject(values);
+                return global.wrapAsObject(values);
             }
 
             return ((LiteralNode<?>)node).getValue();
 
         } else if (node instanceof ObjectNode) {
             final ObjectNode   objNode  = (ObjectNode) node;
-            final ScriptObject object   = ((GlobalObject)global).newObject();
+            final ScriptObject object   = global.newObject();
 
             for (final PropertyNode pNode: objNode.getElements()) {
                 final Node         valueNode = pNode.getValue();
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/JSType.java b/nashorn/src/jdk/nashorn/internal/runtime/JSType.java
index 5413019..c49de9c 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/JSType.java
+++ b/nashorn/src/jdk/nashorn/internal/runtime/JSType.java
@@ -36,6 +36,7 @@
 import jdk.internal.dynalink.beans.StaticClass;
 import jdk.nashorn.api.scripting.JSObject;
 import jdk.nashorn.internal.codegen.CompilerConstants.Call;
+import jdk.nashorn.internal.objects.Global;
 import jdk.nashorn.internal.parser.Lexer;
 import jdk.nashorn.internal.runtime.arrays.ArrayLikeIterator;
 import jdk.nashorn.internal.runtime.linker.Bootstrap;
@@ -852,7 +853,7 @@
      * @return the wrapped object
      */
     public static Object toScriptObject(final Object obj) {
-        return toScriptObject(Context.getGlobalTrusted(), obj);
+        return toScriptObject(Context.getGlobal(), obj);
     }
 
     /**
@@ -865,7 +866,7 @@
      *
      * @return the wrapped object
      */
-    public static Object toScriptObject(final ScriptObject global, final Object obj) {
+    public static Object toScriptObject(final Global global, final Object obj) {
         if (nullOrUndefined(obj)) {
             throw typeError(global, "not.an.object", ScriptRuntime.safeToString(obj));
         }
@@ -874,7 +875,7 @@
             return obj;
         }
 
-        return ((GlobalObject)global).wrapAsObject(obj);
+        return global.wrapAsObject(obj);
     }
 
     /**
@@ -984,7 +985,7 @@
         if (obj instanceof ScriptObject) {
             if (safe) {
                 final ScriptObject sobj = (ScriptObject)obj;
-                final GlobalObject gobj = (GlobalObject)Context.getGlobalTrusted();
+                final Global gobj = Context.getGlobal();
                 return gobj.isError(sobj) ?
                     ECMAException.safeToString(sobj) :
                     sobj.safeToString();
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/ListAdapter.java b/nashorn/src/jdk/nashorn/internal/runtime/ListAdapter.java
index 26c22c3..9a3408f 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/ListAdapter.java
+++ b/nashorn/src/jdk/nashorn/internal/runtime/ListAdapter.java
@@ -34,6 +34,7 @@
 import java.util.concurrent.Callable;
 import jdk.nashorn.api.scripting.JSObject;
 import jdk.nashorn.api.scripting.ScriptObjectMirror;
+import jdk.nashorn.internal.objects.Global;
 import jdk.nashorn.internal.runtime.linker.Bootstrap;
 import jdk.nashorn.internal.runtime.linker.InvokeByName;
 
@@ -54,7 +55,7 @@
     // These add to the back and front of the list
     private static final Object PUSH    = new Object();
     private static InvokeByName getPUSH() {
-        return ((GlobalObject)Context.getGlobal()).getInvokeByName(PUSH,
+        return Context.getGlobal().getInvokeByName(PUSH,
                 new Callable<InvokeByName>() {
                     @Override
                     public InvokeByName call() {
@@ -65,7 +66,7 @@
 
     private static final Object UNSHIFT = new Object();
     private static InvokeByName getUNSHIFT() {
-        return ((GlobalObject)Context.getGlobal()).getInvokeByName(UNSHIFT,
+        return Context.getGlobal().getInvokeByName(UNSHIFT,
                 new Callable<InvokeByName>() {
                     @Override
                     public InvokeByName call() {
@@ -77,7 +78,7 @@
     // These remove from the back and front of the list
     private static final Object POP = new Object();
     private static InvokeByName getPOP() {
-        return ((GlobalObject)Context.getGlobal()).getInvokeByName(POP,
+        return Context.getGlobal().getInvokeByName(POP,
                 new Callable<InvokeByName>() {
                     @Override
                     public InvokeByName call() {
@@ -88,7 +89,7 @@
 
     private static final Object SHIFT = new Object();
     private static InvokeByName getSHIFT() {
-        return ((GlobalObject)Context.getGlobal()).getInvokeByName(SHIFT,
+        return Context.getGlobal().getInvokeByName(SHIFT,
                 new Callable<InvokeByName>() {
                     @Override
                     public InvokeByName call() {
@@ -100,7 +101,7 @@
     // These insert and remove in the middle of the list
     private static final Object SPLICE_ADD = new Object();
     private static InvokeByName getSPLICE_ADD() {
-        return ((GlobalObject)Context.getGlobal()).getInvokeByName(SPLICE_ADD,
+        return Context.getGlobal().getInvokeByName(SPLICE_ADD,
                 new Callable<InvokeByName>() {
                     @Override
                     public InvokeByName call() {
@@ -111,7 +112,7 @@
 
     private static final Object SPLICE_REMOVE = new Object();
     private static InvokeByName getSPLICE_REMOVE() {
-        return ((GlobalObject)Context.getGlobal()).getInvokeByName(SPLICE_REMOVE,
+        return  Context.getGlobal().getInvokeByName(SPLICE_REMOVE,
                 new Callable<InvokeByName>() {
                     @Override
                     public InvokeByName call() {
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/NativeJavaPackage.java b/nashorn/src/jdk/nashorn/internal/runtime/NativeJavaPackage.java
index 591fd32..fbca1c3 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/NativeJavaPackage.java
+++ b/nashorn/src/jdk/nashorn/internal/runtime/NativeJavaPackage.java
@@ -35,7 +35,6 @@
 import jdk.internal.dynalink.support.Guards;
 import jdk.nashorn.internal.lookup.MethodHandleFactory;
 import jdk.nashorn.internal.lookup.MethodHandleFunctionality;
-import jdk.nashorn.internal.objects.NativeJava;
 import jdk.nashorn.internal.objects.annotations.Attribute;
 import jdk.nashorn.internal.objects.annotations.Function;
 
@@ -52,7 +51,7 @@
  * var ArrayList = java.util.ArrayList
  * var list = new ArrayList
  * </pre>
- * You can also use {@link NativeJava#type(Object, Object)} to access Java classes. These two statements are mostly
+ * You can also use {@link jdk.nashorn.internal.objects.NativeJava#type(Object, Object)} to access Java classes. These two statements are mostly
  * equivalent:
  * <pre>
  * var listType1 = java.util.ArrayList
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/ParserException.java b/nashorn/src/jdk/nashorn/internal/runtime/ParserException.java
index 2424bc3..5137d59 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/ParserException.java
+++ b/nashorn/src/jdk/nashorn/internal/runtime/ParserException.java
@@ -26,6 +26,7 @@
 package jdk.nashorn.internal.runtime;
 
 import jdk.nashorn.api.scripting.NashornException;
+import jdk.nashorn.internal.objects.Global;
 import jdk.nashorn.internal.parser.Token;
 
 /**
@@ -110,7 +111,7 @@
      * Throw this {@code ParserException} as one of the 7 native JavaScript errors
      * @param global global scope object
      */
-    public void throwAsEcmaException(final ScriptObject global) {
+    public void throwAsEcmaException(final Global global) {
         throw ECMAErrors.asEcmaException(global, this);
     }
 }
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/Property.java b/nashorn/src/jdk/nashorn/internal/runtime/Property.java
index d1dbe2a..885fa71 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/Property.java
+++ b/nashorn/src/jdk/nashorn/internal/runtime/Property.java
@@ -84,9 +84,13 @@
     /** Can this property be undefined? */
     public static final int CAN_BE_UNDEFINED = 1 << 8;
 
-    /* Is this a function declaration property ? */
+    /** Is this a function declaration property ? */
     public static final int IS_FUNCTION_DECLARATION = 1 << 9;
 
+    /** Is this property bound to a receiver? This means get/set operations will be delegated to
+     *  a statically defined object instead of the object passed as callsite parameter. */
+    public static final int IS_BOUND = 1 << 10;
+
     /** Property key. */
     private final String key;
 
@@ -252,6 +256,16 @@
     }
 
     /**
+     * Is this property bound to a receiver? If this method returns {@code true} get and set operations
+     * will be delegated to a statically bound object instead of the object passed as parameter.
+     *
+     * @return true if this is a bound property
+     */
+    public boolean isBound() {
+        return (flags & IS_BOUND) == IS_BOUND;
+    }
+
+    /**
      * Does this property use any slots in the spill array described in
      * {@link Property#isSpill}? In that case how many. Currently a property
      * only uses max one spill slot, but this may change in future representations
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/RecompilableScriptFunctionData.java b/nashorn/src/jdk/nashorn/internal/runtime/RecompilableScriptFunctionData.java
index 2b18cbc..7e1a516 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/RecompilableScriptFunctionData.java
+++ b/nashorn/src/jdk/nashorn/internal/runtime/RecompilableScriptFunctionData.java
@@ -103,9 +103,7 @@
     public RecompilableScriptFunctionData(final FunctionNode functionNode, final CodeInstaller<ScriptEnvironment> installer, final String allocatorClassName, final PropertyMap allocatorMap) {
         super(functionName(functionNode),
               functionNode.getParameters().size(),
-              functionNode.isStrict(),
-              false,
-              true);
+              getFlags(functionNode));
 
         this.functionNode       = functionNode;
         this.source             = functionNode.getSource();
@@ -129,10 +127,11 @@
         final StringBuilder sb = new StringBuilder();
 
         if (source != null) {
-            sb.append(source.getName())
-                .append(':')
-                .append(functionNode.getLineNumber())
-                .append(' ');
+            sb.append(source.getName());
+            if (functionNode != null) {
+                sb.append(':').append(functionNode.getLineNumber());
+            }
+            sb.append(' ');
         }
 
         return sb.toString() + super.toString();
@@ -159,6 +158,20 @@
         return Token.toDesc(TokenType.FUNCTION, position, length);
     }
 
+    private static int getFlags(final FunctionNode functionNode) {
+        int flags = IS_CONSTRUCTOR;
+        if (functionNode.isStrict()) {
+            flags |= IS_STRICT;
+        }
+        if (functionNode.needsCallee()) {
+            flags |= NEEDS_CALLEE;
+        }
+        if (functionNode.usesThis() || functionNode.hasEval()) {
+            flags |= USES_THIS;
+        }
+        return flags;
+    }
+
     @Override
     ScriptObject allocate(final PropertyMap map) {
         try {
@@ -182,41 +195,42 @@
         return allocatorMap;
     }
 
+
+    @Override
+    protected void ensureCompiled() {
+        if (functionNode != null && functionNode.isLazy()) {
+            Compiler.LOG.info("Trampoline hit: need to do lazy compilation of '", functionNode.getName(), "'");
+            final Compiler compiler = new Compiler(installer);
+            functionNode = compiler.compile(functionNode);
+            assert !functionNode.isLazy();
+            compiler.install(functionNode);
+            flags = getFlags(functionNode);
+        }
+    }
+
     @Override
     protected synchronized void ensureCodeGenerated() {
-         if (!code.isEmpty()) {
-             return; // nothing to do, we have code, at least some.
-         }
+        if (!code.isEmpty()) {
+            return; // nothing to do, we have code, at least some.
+        }
 
-         if (functionNode.isLazy()) {
-             Compiler.LOG.info("Trampoline hit: need to do lazy compilation of '", functionNode.getName(), "'");
-             final Compiler compiler = new Compiler(installer);
-             functionNode = compiler.compile(functionNode);
-             assert !functionNode.isLazy();
-             compiler.install(functionNode);
+        ensureCompiled();
 
-             /*
-              * We don't need to update any flags - varArgs and needsCallee are instrincic
-              * in the function world we need to get a destination node from the compile instead
-              * and replace it with our function node. TODO
-              */
-         }
+        /*
+         * We can't get to this program point unless we have bytecode, either from
+         * eager compilation or from running a lazy compile on the lines above
+         */
 
-         /*
-          * We can't get to this program point unless we have bytecode, either from
-          * eager compilation or from running a lazy compile on the lines above
-          */
+        assert functionNode.hasState(CompilationState.EMITTED) : functionNode.getName() + " " + functionNode.getState() + " " + Debug.id(functionNode);
 
-         assert functionNode.hasState(CompilationState.EMITTED) : functionNode.getName() + " " + functionNode.getState() + " " + Debug.id(functionNode);
+        // code exists - look it up and add it into the automatically sorted invoker list
+        addCode(functionNode);
 
-         // code exists - look it up and add it into the automatically sorted invoker list
-         addCode(functionNode);
-
-         if (! functionNode.canSpecialize()) {
-             // allow GC to claim IR stuff that is not needed anymore
-             functionNode = null;
-             installer = null;
-         }
+        if (! functionNode.canSpecialize()) {
+            // allow GC to claim IR stuff that is not needed anymore
+            functionNode = null;
+            installer = null;
+        }
     }
 
     private MethodHandle addCode(final FunctionNode fn) {
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/ScriptFunction.java b/nashorn/src/jdk/nashorn/internal/runtime/ScriptFunction.java
index 0f5174e..3d8b4ff 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/ScriptFunction.java
+++ b/nashorn/src/jdk/nashorn/internal/runtime/ScriptFunction.java
@@ -38,6 +38,7 @@
 import jdk.internal.dynalink.linker.LinkRequest;
 import jdk.nashorn.internal.codegen.CompilerConstants.Call;
 import jdk.nashorn.internal.lookup.MethodHandleFactory;
+import jdk.nashorn.internal.objects.Global;
 import jdk.nashorn.internal.runtime.linker.NashornCallSiteDescriptor;
 import jdk.nashorn.internal.runtime.linker.NashornGuards;
 
@@ -66,6 +67,8 @@
 
     private static final MethodHandle WRAPFILTER = findOwnMH("wrapFilter", Object.class, Object.class);
 
+    private static final MethodHandle GLOBALFILTER = findOwnMH("globalFilter", Object.class, Object.class);
+
     /** method handle to scope getter for this ScriptFunction */
     public static final Call GET_SCOPE = virtualCallNoLookup(ScriptFunction.class, "getScope", ScriptObject.class);
 
@@ -91,9 +94,7 @@
      * @param map           property map
      * @param scope         scope
      * @param specs         specialized version of this function - other method handles
-     * @param strict        is this a strict mode function?
-     * @param builtin       is this a built in function?
-     * @param isConstructor is this a constructor?
+     * @param flags         {@link ScriptFunctionData} flags
      */
     protected ScriptFunction(
             final String name,
@@ -101,11 +102,9 @@
             final PropertyMap map,
             final ScriptObject scope,
             final MethodHandle[] specs,
-            final boolean strict,
-            final boolean builtin,
-            final boolean isConstructor) {
+            final int flags) {
 
-        this(new FinalScriptFunctionData(name, methodHandle, specs, strict, builtin, isConstructor), map, scope);
+        this(new FinalScriptFunctionData(name, methodHandle, specs, flags), map, scope);
     }
 
     /**
@@ -477,7 +476,14 @@
         if (obj instanceof ScriptObject || !ScriptFunctionData.isPrimitiveThis(obj)) {
             return obj;
         }
-        return ((GlobalObject)Context.getGlobalTrusted()).wrapAsObject(obj);
+        return Context.getGlobal().wrapAsObject(obj);
+    }
+
+
+    @SuppressWarnings("unused")
+    private static Object globalFilter(final Object object) {
+        // replace whatever we get with the current global object
+        return Context.getGlobal();
     }
 
     /**
@@ -495,11 +501,11 @@
     @Override
     protected GuardedInvocation findCallMethod(final CallSiteDescriptor desc, final LinkRequest request) {
         final MethodType type = desc.getMethodType();
+        final boolean scopeCall = NashornCallSiteDescriptor.isScope(desc);
 
         if (request.isCallSiteUnstable()) {
-            // (this, callee, args...) => (this, callee, args[])
-            final MethodHandle collector = MH.asCollector(ScriptRuntime.APPLY.methodHandle(), Object[].class,
-                    type.parameterCount() - 2);
+            // (callee, this, args...) => (callee, this, args[])
+            final MethodHandle collector = MH.asCollector(ScriptRuntime.APPLY.methodHandle(), Object[].class, type.parameterCount() - 2);
 
             // If call site is statically typed to take a ScriptFunction, we don't need a guard, otherwise we need a
             // generic "is this a ScriptFunction?" guard.
@@ -510,17 +516,12 @@
         MethodHandle boundHandle;
         MethodHandle guard = null;
 
-        final boolean scopeCall = NashornCallSiteDescriptor.isScope(desc);
-
         if (data.needsCallee()) {
             final MethodHandle callHandle = getBestInvoker(type, request.getArguments());
-            if (scopeCall) {
+            if (scopeCall && needsWrappedThis()) {
                 // Make a handle that drops the passed "this" argument and substitutes either Global or Undefined
-                // (callee, this, args...) => (callee, args...)
-                boundHandle = MH.insertArguments(callHandle, 1, needsWrappedThis() ? Context.getGlobalTrusted() : ScriptRuntime.UNDEFINED);
-                // (callee, args...) => (callee, [this], args...)
-                boundHandle = MH.dropArguments(boundHandle, 1, Object.class);
-
+                // (callee, this, args...) => (callee, [this], args...)
+                boundHandle = MH.filterArguments(callHandle, 1, GLOBALFILTER);
             } else {
                 // It's already (callee, this, args...), just what we need
                 boundHandle = callHandle;
@@ -531,12 +532,12 @@
                 // NOTE: the only built-in named "extend" is NativeJava.extend. As a special-case we're binding the
                 // current lookup as its "this" so it can do security-sensitive creation of adapter classes.
                 boundHandle = MH.dropArguments(MH.bindTo(callHandle, desc.getLookup()), 0, Object.class, Object.class);
-            } else if (scopeCall) {
+            } else if (scopeCall && needsWrappedThis()) {
                 // Make a handle that drops the passed "this" argument and substitutes either Global or Undefined
-                // (this, args...) => (args...)
-                boundHandle = MH.bindTo(callHandle, needsWrappedThis() ? Context.getGlobalTrusted() : ScriptRuntime.UNDEFINED);
-                // (args...) => ([callee], [this], args...)
-                boundHandle = MH.dropArguments(boundHandle, 0, Object.class, Object.class);
+                // (this, args...) => ([this], args...)
+                boundHandle = MH.filterArguments(callHandle, 0, GLOBALFILTER);
+                // ([this], args...) => ([callee], [this], args...)
+                boundHandle = MH.dropArguments(boundHandle, 0, Object.class);
             } else {
                 // (this, args...) => ([callee], this, args...)
                 boundHandle = MH.dropArguments(callHandle, 0, Object.class);
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/ScriptFunctionData.java b/nashorn/src/jdk/nashorn/internal/runtime/ScriptFunctionData.java
index f056993..aee367d 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/ScriptFunctionData.java
+++ b/nashorn/src/jdk/nashorn/internal/runtime/ScriptFunctionData.java
@@ -32,6 +32,7 @@
 import java.lang.invoke.MethodHandle;
 import java.lang.invoke.MethodHandles;
 import java.lang.invoke.MethodType;
+import jdk.nashorn.internal.objects.Global;
 import jdk.nashorn.internal.runtime.linker.JavaAdapterFactory;
 
 /**
@@ -47,33 +48,44 @@
     /** All versions of this function that have been generated to code */
     protected final CompiledFunctions code;
 
+    /** Function flags */
+    protected int flags;
+
     private int arity;
 
-    private final boolean isStrict;
-
-    private final boolean isBuiltin;
-
-    private final boolean isConstructor;
-
     private static final MethodHandle NEWFILTER     = findOwnMH("newFilter", Object.class, Object.class, Object.class);
     private static final MethodHandle BIND_VAR_ARGS = findOwnMH("bindVarArgs", Object[].class, Object[].class, Object[].class);
 
+    /** Is this a strict mode function? */
+    public static final int IS_STRICT      = 1 << 0;
+    /** Is this a built-in function? */
+    public static final int IS_BUILTIN     = 1 << 1;
+    /** Is this a constructor function? */
+    public static final int IS_CONSTRUCTOR = 1 << 2;
+    /** Does this function expect a callee argument? */
+    public static final int NEEDS_CALLEE   = 1 << 3;
+    /** Does this function make use of the this-object argument? */
+    public static final int USES_THIS      = 1 << 4;
+
+    /** Flag for strict or built-in functions */
+    public static final int IS_STRICT_OR_BUILTIN = IS_STRICT | IS_BUILTIN;
+    /** Flag for built-in constructors */
+    public static final int IS_BUILTIN_CONSTRUCTOR = IS_BUILTIN | IS_CONSTRUCTOR;
+    /** Flag for strict constructors */
+    public static final int IS_STRICT_CONSTRUCTOR = IS_STRICT | IS_CONSTRUCTOR;
+
     /**
      * Constructor
      *
      * @param name          script function name
      * @param arity         arity
-     * @param isStrict      is the function strict
-     * @param isBuiltin     is the function built in
-     * @param isConstructor is the function a constructor
+     * @param flags         the function flags
      */
-    ScriptFunctionData(final String name, final int arity, final boolean isStrict, final boolean isBuiltin, final boolean isConstructor) {
-        this.name          = name;
-        this.arity         = arity;
-        this.code          = new CompiledFunctions();
-        this.isStrict      = isStrict;
-        this.isBuiltin     = isBuiltin;
-        this.isConstructor = isConstructor;
+    ScriptFunctionData(final String name, final int arity, final int flags) {
+        this.name  = name;
+        this.arity = arity;
+        this.code  = new CompiledFunctions();
+        this.flags = flags;
     }
 
     final int getArity() {
@@ -105,21 +117,21 @@
      * @return true if strict, false otherwise
      */
     public boolean isStrict() {
-        return isStrict;
+        return (flags & IS_STRICT) != 0;
     }
 
     boolean isBuiltin() {
-        return isBuiltin;
+        return (flags & IS_BUILTIN) != 0;
     }
 
     boolean isConstructor() {
-        return isConstructor;
+        return (flags & IS_CONSTRUCTOR) != 0;
     }
 
     boolean needsCallee() {
-        // we don't know if we need a callee or not unless we are generated
-        ensureCodeGenerated();
-        return code.needsCallee();
+        // we don't know if we need a callee or not unless code has been compiled
+        ensureCompiled();
+        return (flags & NEEDS_CALLEE) != 0;
     }
 
     /**
@@ -128,7 +140,7 @@
      * @return true if this argument must be an object
      */
     boolean needsWrappedThis() {
-        return !isStrict && !isBuiltin;
+        return (flags & USES_THIS) != 0 && (flags & IS_STRICT_OR_BUILTIN) == 0;
     }
 
     String toSource() {
@@ -202,6 +214,15 @@
     }
 
     /**
+     * If we can have lazy code generation, this is a hook to ensure that the code has been compiled.
+     * This does not guarantee the code been installed in this {@code ScriptFunctionData} instance;
+     * use {@link #ensureCodeGenerated()} to install the actual method handles.
+     */
+    protected void ensureCompiled() {
+        //empty
+    }
+
+    /**
      * Return a generic Object/Object invoker for this method. It will ensure code
      * is generated, get the most generic of all versions of this function and adapt it
      * to Objects.
@@ -259,6 +280,8 @@
 
         final Object[] allArgs = args == null ? ScriptRuntime.EMPTY_ARRAY : args;
         final int length = args == null ? 0 : args.length;
+        // Clear the callee and this flags
+        final int boundFlags = flags & ~NEEDS_CALLEE & ~USES_THIS;
 
         CompiledFunctions boundList = new CompiledFunctions();
         if (code.size() == 1) {
@@ -273,8 +296,7 @@
             boundList.add(bind(inv, fn, self, allArgs));
         }
 
-        ScriptFunctionData boundData = new FinalScriptFunctionData(name, arity == -1 ? -1 : Math.max(0, arity - length), boundList, isStrict(), isBuiltin(), isConstructor());
-        return boundData;
+        return new FinalScriptFunctionData(name, arity == -1 ? -1 : Math.max(0, arity - length), boundList, boundFlags);
     }
 
     /**
@@ -351,11 +373,11 @@
     private Object convertThisObject(final Object thiz) {
         if (!(thiz instanceof ScriptObject) && needsWrappedThis()) {
             if (JSType.nullOrUndefined(thiz)) {
-                return Context.getGlobalTrusted();
+                return Context.getGlobal();
             }
 
             if (isPrimitiveThis(thiz)) {
-                return ((GlobalObject)Context.getGlobalTrusted()).wrapAsObject(thiz);
+                return Context.getGlobal().wrapAsObject(thiz);
             }
         }
 
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/ScriptObject.java b/nashorn/src/jdk/nashorn/internal/runtime/ScriptObject.java
index b7f9c4c..05e236e 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/ScriptObject.java
+++ b/nashorn/src/jdk/nashorn/internal/runtime/ScriptObject.java
@@ -66,6 +66,7 @@
 import jdk.nashorn.internal.lookup.MethodHandleFactory;
 import jdk.nashorn.internal.objects.AccessorPropertyDescriptor;
 import jdk.nashorn.internal.objects.DataPropertyDescriptor;
+import jdk.nashorn.internal.objects.Global;
 import jdk.nashorn.internal.runtime.arrays.ArrayData;
 import jdk.nashorn.internal.runtime.arrays.ArrayIndex;
 import jdk.nashorn.internal.runtime.linker.Bootstrap;
@@ -131,7 +132,8 @@
 
     static final MethodHandle GETPROTO           = findOwnMH("getProto", ScriptObject.class);
     static final MethodHandle SETPROTOCHECK      = findOwnMH("setProtoCheck", void.class, Object.class);
-    static final MethodHandle MEGAMORPHIC_GET    = findOwnMH("megamorphicGet", Object.class, String.class, boolean.class);
+    static final MethodHandle MEGAMORPHIC_GET    = findOwnMH("megamorphicGet", Object.class, String.class, boolean.class, boolean.class);
+    static final MethodHandle GLOBALFILTER       = findOwnMH("globalFilter", Object.class, Object.class);
 
     static final MethodHandle SETFIELD           = findOwnMH("setField",         void.class, CallSiteDescriptor.class, PropertyMap.class, PropertyMap.class, MethodHandle.class, Object.class, Object.class);
     static final MethodHandle SETSPILL           = findOwnMH("setSpill",         void.class, CallSiteDescriptor.class, PropertyMap.class, PropertyMap.class, int.class, Object.class, Object.class);
@@ -225,6 +227,7 @@
             final Property oldProp = newMap.findProperty(key);
             if (oldProp == null) {
                 if (property instanceof UserAccessorProperty) {
+                    // Note: we copy accessor functions to this object which is semantically different from binding.
                     final UserAccessorProperty prop = this.newUserAccessors(key, property.getFlags(), property.getGetterFunction(source), property.getSetterFunction(source));
                     newMap = newMap.addPropertyNoHistory(prop);
                 } else {
@@ -322,18 +325,18 @@
       * @return property descriptor
       */
     public final PropertyDescriptor toPropertyDescriptor() {
-        final GlobalObject global = (GlobalObject) Context.getGlobalTrusted();
+        final Global global = Context.getGlobal();
 
         final PropertyDescriptor desc;
         if (isDataDescriptor()) {
             if (has(SET) || has(GET)) {
-                throw typeError((ScriptObject)global, "inconsistent.property.descriptor");
+                throw typeError(global, "inconsistent.property.descriptor");
             }
 
             desc = global.newDataDescriptor(UNDEFINED, false, false, false);
         } else if (isAccessorDescriptor()) {
             if (has(VALUE) || has(WRITABLE)) {
-                throw typeError((ScriptObject)global, "inconsistent.property.descriptor");
+                throw typeError(global, "inconsistent.property.descriptor");
             }
 
             desc = global.newAccessorDescriptor(UNDEFINED, UNDEFINED, false, false);
@@ -352,7 +355,7 @@
      *
      * @return property descriptor
      */
-    public static PropertyDescriptor toPropertyDescriptor(final ScriptObject global, final Object obj) {
+    public static PropertyDescriptor toPropertyDescriptor(final Global global, final Object obj) {
         if (obj instanceof ScriptObject) {
             return ((ScriptObject)obj).toPropertyDescriptor();
         }
@@ -371,7 +374,7 @@
     public Object getOwnPropertyDescriptor(final String key) {
         final Property property = getMap().findProperty(key);
 
-        final GlobalObject global = (GlobalObject)Context.getGlobalTrusted();
+        final Global global = Context.getGlobal();
 
         if (property != null) {
             final ScriptFunction get   = property.getGetterFunction(this);
@@ -436,7 +439,7 @@
      * @return true if property was successfully defined
      */
     public boolean defineOwnProperty(final String key, final Object propertyDesc, final boolean reject) {
-        final ScriptObject       global  = Context.getGlobalTrusted();
+        final Global             global  = Context.getGlobal();
         final PropertyDescriptor desc    = toPropertyDescriptor(global, propertyDesc);
         final Object             current = getOwnPropertyDescriptor(key);
         final String             name    = JSType.toString(key);
@@ -634,7 +637,7 @@
         final int propFlags = Property.toFlags(pdesc);
 
         if (pdesc.type() == PropertyDescriptor.GENERIC) {
-            final GlobalObject global = (GlobalObject) Context.getGlobalTrusted();
+            final Global global = Context.getGlobal();
             final PropertyDescriptor dDesc = global.newDataDescriptor(UNDEFINED, false, false, false);
 
             dDesc.fillFrom((ScriptObject)pdesc);
@@ -975,17 +978,6 @@
     }
 
     /**
-      * Get the object value of a property
-      *
-      * @param find {@link FindProperty} lookup result
-      *
-      * @return the value of the property
-      */
-    protected static Object getObjectValue(final FindProperty find) {
-        return find.getObjectValue();
-    }
-
-    /**
      * Return methodHandle of value function for call.
      *
      * @param find      data from find property.
@@ -995,7 +987,7 @@
      * @return value of property as a MethodHandle or null.
      */
     protected MethodHandle getCallMethodHandle(final FindProperty find, final MethodType type, final String bindName) {
-        return getCallMethodHandle(getObjectValue(find), type, bindName);
+        return getCallMethodHandle(find.getObjectValue(), type, bindName);
     }
 
     /**
@@ -1019,7 +1011,7 @@
      * @return Value of property.
      */
     public final Object getWithProperty(final Property property) {
-        return getObjectValue(new FindProperty(this, this, property));
+        return new FindProperty(this, this, property).getObjectValue();
     }
 
     /**
@@ -1158,7 +1150,7 @@
             }
             setProto((ScriptObject)newProto);
         } else {
-            final ScriptObject global = Context.getGlobalTrusted();
+            final Global global = Context.getGlobal();
             final Object  newProtoObject = JSType.toScriptObject(global, newProto);
 
             if (newProtoObject instanceof ScriptObject) {
@@ -1248,11 +1240,11 @@
      * @return the default value
      */
     public Object getDefaultValue(final Class<?> typeHint) {
-        // We delegate to GlobalObject, as the implementation uses dynamic call sites to invoke object's "toString" and
+        // We delegate to Global, as the implementation uses dynamic call sites to invoke object's "toString" and
         // "valueOf" methods, and in order to avoid those call sites from becoming megamorphic when multiple contexts
         // are being executed in a long-running program, we move the code and their associated dynamic call sites
         // (Global.TO_STRING and Global.VALUE_OF) into per-context code.
-        return ((GlobalObject)Context.getGlobalTrusted()).getDefaultValue(this, typeHint);
+        return Context.getGlobal().getDefaultValue(this, typeHint);
     }
 
     /**
@@ -1740,7 +1732,7 @@
     protected GuardedInvocation findGetMethod(final CallSiteDescriptor desc, final LinkRequest request, final String operator) {
         final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
         if (request.isCallSiteUnstable() || hasWithScope()) {
-            return findMegaMorphicGetMethod(desc, name, "getMethod".equals(operator));
+            return findMegaMorphicGetMethod(desc, name, "getMethod".equals(operator), isScope() && NashornCallSiteDescriptor.isScope(desc));
         }
 
         final FindProperty find = findProperty(name, true);
@@ -1765,9 +1757,8 @@
         final Property property = find.getProperty();
         methodHandle = find.getGetter(returnType);
 
-        final boolean noGuard = ObjectClassGenerator.OBJECT_FIELDS_ONLY && NashornCallSiteDescriptor.isFastScope(desc) && !property.canChangeType();
-        // getMap() is fine as we have the prototype switchpoint depending on where the property was found
-        final MethodHandle guard = noGuard ? null : NashornGuards.getMapGuard(getMap());
+        // Get the appropriate guard for this callsite and property.
+        final MethodHandle guard = NashornGuards.getGuard(this, property, desc);
         final ScriptObject owner = find.getOwner();
 
         if (methodHandle != null) {
@@ -1777,31 +1768,32 @@
             }
 
             if (!property.hasGetterFunction(owner)) {
-                // If not a scope bind to actual prototype as changing prototype will change the property map.
-                // For scopes we install a filter that replaces the self object with the prototype owning the property.
-                methodHandle = isScope() ?
-                        addProtoFilter(methodHandle, find.getProtoChainLength()) :
-                        bindTo(methodHandle, owner);
+                // Add a filter that replaces the self object with the prototype owning the property.
+                methodHandle = addProtoFilter(methodHandle, find.getProtoChainLength());
             }
-            return new GuardedInvocation(methodHandle, noGuard ? null : getProtoSwitchPoint(name, owner), guard);
+            return new GuardedInvocation(methodHandle, guard == null ? null : getProtoSwitchPoint(name, owner), guard);
         }
 
         assert !NashornCallSiteDescriptor.isFastScope(desc);
         return new GuardedInvocation(Lookup.emptyGetter(returnType), getProtoSwitchPoint(name, owner), guard);
     }
 
-    private static GuardedInvocation findMegaMorphicGetMethod(final CallSiteDescriptor desc, final String name, final boolean isMethod) {
-        final MethodHandle invoker = MH.insertArguments(MEGAMORPHIC_GET, 1, name, isMethod);
+    private static GuardedInvocation findMegaMorphicGetMethod(final CallSiteDescriptor desc, final String name,
+                                                              final boolean isMethod, final boolean isScope) {
+        final MethodHandle invoker = MH.insertArguments(MEGAMORPHIC_GET, 1, name, isMethod, isScope);
         final MethodHandle guard = getScriptObjectGuard(desc.getMethodType());
         return new GuardedInvocation(invoker, guard);
     }
 
     @SuppressWarnings("unused")
-    private Object megamorphicGet(final String key, final boolean isMethod) {
+    private Object megamorphicGet(final String key, final boolean isMethod, final boolean isScope) {
         final FindProperty find = findProperty(key, true);
 
         if (find != null) {
-            return getObjectValue(find);
+            return find.getObjectValue();
+        }
+        if (isScope) {
+            throw referenceError("not.defined", key);
         }
 
         return isMethod ? getNoSuchMethod(key) : invokeNoSuchProperty(key);
@@ -1996,6 +1988,15 @@
         }
     }
 
+    @SuppressWarnings("unused")
+    private static Object globalFilter(final Object object) {
+        ScriptObject sobj = (ScriptObject) object;
+        while (sobj != null && !(sobj instanceof Global)) {
+            sobj = sobj.getProto();
+        }
+        return sobj;
+    }
+
     private static GuardedInvocation findMegaMorphicSetMethod(final CallSiteDescriptor desc, final String name) {
         final MethodType type = desc.getMethodType().insertParameterTypes(1, Object.class);
         final GuardedInvocation inv = findSetIndexMethod(type, NashornCallSiteDescriptor.isStrict(desc));
@@ -2041,7 +2042,7 @@
             return noSuchProperty(desc, request);
         }
 
-        final Object value = getObjectValue(find);
+        final Object value = find.getObjectValue();
         if (! (value instanceof ScriptFunction)) {
             return createEmptyGetter(desc, name);
         }
@@ -2067,7 +2068,7 @@
         final boolean scopeAccess = isScope() && NashornCallSiteDescriptor.isScope(desc);
 
         if (find != null) {
-            final Object   value        = getObjectValue(find);
+            final Object   value        = find.getObjectValue();
             ScriptFunction func         = null;
             MethodHandle   methodHandle = null;
 
@@ -2102,7 +2103,7 @@
         final FindProperty find = findProperty(NO_SUCH_PROPERTY_NAME, true);
 
         if (find != null) {
-            final Object func = getObjectValue(find);
+            final Object func = find.getObjectValue();
 
             if (func instanceof ScriptFunction) {
                 return ScriptRuntime.apply((ScriptFunction)func, this, name);
@@ -2124,7 +2125,7 @@
             return invokeNoSuchProperty(name);
         }
 
-        final Object value = getObjectValue(find);
+        final Object value = find.getObjectValue();
         if (! (value instanceof ScriptFunction)) {
             return UNDEFINED;
         }
@@ -2664,7 +2665,7 @@
                     final FindProperty find = object.findProperty(key, false, false, this);
 
                     if (find != null) {
-                        return getObjectValue(find);
+                        return find.getObjectValue();
                     }
                 }
 
@@ -2682,7 +2683,7 @@
             final FindProperty find = findProperty(key, true);
 
             if (find != null) {
-                return getObjectValue(find);
+                return find.getObjectValue();
             }
         }
 
@@ -2823,7 +2824,15 @@
                 throw typeError("object.non.extensible", key, ScriptRuntime.safeToString(this));
             }
         } else {
-            spill(key, value);
+            ScriptObject sobj = this;
+            // undefined scope properties are set in the global object.
+            if (isScope()) {
+                while (sobj != null && !(sobj instanceof Global)) {
+                    sobj = sobj.getProto();
+                }
+                assert sobj != null : "no parent global object in scope";
+            }
+            sobj.spill(key, value);
         }
     }
 
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/ScriptRuntime.java b/nashorn/src/jdk/nashorn/internal/runtime/ScriptRuntime.java
index d970567..6df047d 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/ScriptRuntime.java
+++ b/nashorn/src/jdk/nashorn/internal/runtime/ScriptRuntime.java
@@ -474,7 +474,7 @@
      * @return {@link WithObject} that is the new scope
      */
     public static ScriptObject openWith(final ScriptObject scope, final Object expression) {
-        final ScriptObject global = Context.getGlobalTrusted();
+        final Global global = Context.getGlobal();
         if (expression == UNDEFINED) {
             throw typeError(global, "cant.apply.with.to.undefined");
         } else if (expression == null) {
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/SetMethodCreator.java b/nashorn/src/jdk/nashorn/internal/runtime/SetMethodCreator.java
index bdbc8ec..edee374 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/SetMethodCreator.java
+++ b/nashorn/src/jdk/nashorn/internal/runtime/SetMethodCreator.java
@@ -31,7 +31,6 @@
 import java.lang.invoke.MethodHandle;
 import jdk.internal.dynalink.CallSiteDescriptor;
 import jdk.internal.dynalink.linker.GuardedInvocation;
-import jdk.nashorn.internal.codegen.ObjectClassGenerator;
 import jdk.nashorn.internal.lookup.Lookup;
 import jdk.nashorn.internal.runtime.linker.NashornCallSiteDescriptor;
 import jdk.nashorn.internal.runtime.linker.NashornGuards;
@@ -104,21 +103,9 @@
          * @return the composed guarded invocation that represents the dynamic setter method for the property.
          */
         GuardedInvocation createGuardedInvocation() {
-            return new GuardedInvocation(methodHandle, getGuard());
+            return new GuardedInvocation(methodHandle, NashornGuards.getGuard(sobj, property, desc));
         }
 
-        private MethodHandle getGuard() {
-            return needsNoGuard() ? null : NashornGuards.getMapGuard(getMap());
-        }
-
-        private boolean needsNoGuard() {
-            return NashornCallSiteDescriptor.isFastScope(desc) &&
-                    (ObjectClassGenerator.OBJECT_FIELDS_ONLY || isPropertyTypeStable());
-        }
-
-        private boolean isPropertyTypeStable() {
-            return property == null || !property.canChangeType();
-        }
     }
 
     private SetMethod createSetMethod() {
@@ -153,10 +140,7 @@
 
         final MethodHandle boundHandle;
         if (!property.hasSetterFunction(find.getOwner()) && find.isInherited()) {
-            // Bind or add prototype filter depending on whether this is a scope object.
-            boundHandle = sobj.isScope() ?
-                    ScriptObject.addProtoFilter(methodHandle, find.getProtoChainLength()):
-                    ScriptObject.bindTo(methodHandle, find.getOwner());
+            boundHandle = ScriptObject.addProtoFilter(methodHandle, find.getProtoChainLength());
         } else {
             boundHandle = methodHandle;
         }
@@ -164,8 +148,8 @@
     }
 
     private SetMethod createGlobalPropertySetter() {
-        final ScriptObject global = Context.getGlobalTrusted();
-        return new SetMethod(ScriptObject.bindTo(global.addSpill(getName()), global), null);
+        final ScriptObject global = Context.getGlobal();
+        return new SetMethod(MH.filterArguments(global.addSpill(getName()), 0, ScriptObject.GLOBALFILTER), null);
     }
 
     private SetMethod createNewPropertySetter() {
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/UserAccessorProperty.java b/nashorn/src/jdk/nashorn/internal/runtime/UserAccessorProperty.java
index 931d712..a69de45 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/UserAccessorProperty.java
+++ b/nashorn/src/jdk/nashorn/internal/runtime/UserAccessorProperty.java
@@ -34,6 +34,7 @@
 import jdk.nashorn.internal.runtime.linker.Bootstrap;
 
 import static jdk.nashorn.internal.codegen.CompilerConstants.staticCall;
+import jdk.nashorn.internal.objects.Global;
 import static jdk.nashorn.internal.runtime.ECMAErrors.typeError;
 import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED;
 
@@ -73,7 +74,7 @@
 
     private static MethodHandle getINVOKE_UA_GETTER() {
 
-        return ((GlobalObject)Context.getGlobal()).getDynamicInvoker(INVOKE_UA_GETTER,
+        return Context.getGlobal().getDynamicInvoker(INVOKE_UA_GETTER,
                 new Callable<MethodHandle>() {
                     @Override
                     public MethodHandle call() {
@@ -86,7 +87,7 @@
     /** Dynamic invoker for setter */
     private static Object INVOKE_UA_SETTER = new Object();
     private static MethodHandle getINVOKE_UA_SETTER() {
-        return ((GlobalObject)Context.getGlobal()).getDynamicInvoker(INVOKE_UA_SETTER,
+        return Context.getGlobal().getDynamicInvoker(INVOKE_UA_SETTER,
                 new Callable<MethodHandle>() {
                     @Override
                     public MethodHandle call() {
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/WithObject.java b/nashorn/src/jdk/nashorn/internal/runtime/WithObject.java
index d4a28cd..dc48d72 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/WithObject.java
+++ b/nashorn/src/jdk/nashorn/internal/runtime/WithObject.java
@@ -88,6 +88,11 @@
 
     @Override
     public GuardedInvocation lookup(final CallSiteDescriptor desc, final LinkRequest request) {
+        if (request.isCallSiteUnstable()) {
+            // Fall back to megamorphic invocation which performs a complete lookup each time without further relinking.
+            return super.lookup(desc, request);
+        }
+
         // With scopes can never be observed outside of Nashorn code, so all call sites that can address it will of
         // necessity have a Nashorn descriptor - it is safe to cast.
         final NashornCallSiteDescriptor ndesc = (NashornCallSiteDescriptor)desc;
@@ -265,7 +270,7 @@
     }
 
     private static MethodHandle filter(final MethodHandle mh, final MethodHandle filter) {
-        return MH.filterArguments(mh, 0, filter);
+        return MH.filterArguments(mh, 0, filter.asType(filter.type().changeReturnType(mh.type().parameterType(0))));
     }
 
     /**
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/arrays/ArrayData.java b/nashorn/src/jdk/nashorn/internal/runtime/arrays/ArrayData.java
index 0aa1d9e..58f3296 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/arrays/ArrayData.java
+++ b/nashorn/src/jdk/nashorn/internal/runtime/arrays/ArrayData.java
@@ -27,7 +27,7 @@
 
 import java.lang.invoke.MethodHandle;
 import java.nio.ByteBuffer;
-import jdk.nashorn.internal.runtime.GlobalObject;
+import jdk.nashorn.internal.objects.Global;
 import jdk.nashorn.internal.runtime.JSType;
 import jdk.nashorn.internal.runtime.PropertyDescriptor;
 
@@ -399,7 +399,7 @@
      *
      * @return property descriptor for element
      */
-    public PropertyDescriptor getDescriptor(final GlobalObject global, final int index) {
+    public PropertyDescriptor getDescriptor(final Global global, final int index) {
         return global.newDataDescriptor(getObject(index), true, true, true);
     }
 
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/arrays/ByteBufferArrayData.java b/nashorn/src/jdk/nashorn/internal/runtime/arrays/ByteBufferArrayData.java
index 58ea131..33c8679 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/arrays/ByteBufferArrayData.java
+++ b/nashorn/src/jdk/nashorn/internal/runtime/arrays/ByteBufferArrayData.java
@@ -27,7 +27,7 @@
 import static jdk.nashorn.internal.runtime.ECMAErrors.typeError;
 
 import java.nio.ByteBuffer;
-import jdk.nashorn.internal.runtime.GlobalObject;
+import jdk.nashorn.internal.objects.Global;
 import jdk.nashorn.internal.runtime.PropertyDescriptor;
 import jdk.nashorn.internal.runtime.ScriptRuntime;
 
@@ -60,7 +60,8 @@
      *
      * @return property descriptor for element
      */
-    public PropertyDescriptor getDescriptor(final GlobalObject global, final int index) {
+    @Override
+    public PropertyDescriptor getDescriptor(final Global global, final int index) {
         // make the index properties not configurable
         return global.newDataDescriptor(getObject(index), false, true, true);
     }
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/arrays/FrozenArrayFilter.java b/nashorn/src/jdk/nashorn/internal/runtime/arrays/FrozenArrayFilter.java
index a1f772b..e15541d 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/arrays/FrozenArrayFilter.java
+++ b/nashorn/src/jdk/nashorn/internal/runtime/arrays/FrozenArrayFilter.java
@@ -25,9 +25,9 @@
 
 package jdk.nashorn.internal.runtime.arrays;
 
+import jdk.nashorn.internal.objects.Global;
 import static jdk.nashorn.internal.runtime.ECMAErrors.typeError;
 
-import jdk.nashorn.internal.runtime.GlobalObject;
 import jdk.nashorn.internal.runtime.PropertyDescriptor;
 
 /**
@@ -44,7 +44,7 @@
     }
 
     @Override
-    public PropertyDescriptor getDescriptor(final GlobalObject global, final int index) {
+    public PropertyDescriptor getDescriptor(final Global global, final int index) {
         return global.newDataDescriptor(getObject(index), false, true, false);
     }
 
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/arrays/SealedArrayFilter.java b/nashorn/src/jdk/nashorn/internal/runtime/arrays/SealedArrayFilter.java
index 6f77ddc..bc6de9f 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/arrays/SealedArrayFilter.java
+++ b/nashorn/src/jdk/nashorn/internal/runtime/arrays/SealedArrayFilter.java
@@ -25,9 +25,9 @@
 
 package jdk.nashorn.internal.runtime.arrays;
 
+import jdk.nashorn.internal.objects.Global;
 import static jdk.nashorn.internal.runtime.ECMAErrors.typeError;
 
-import jdk.nashorn.internal.runtime.GlobalObject;
 import jdk.nashorn.internal.runtime.PropertyDescriptor;
 
 /**
@@ -62,7 +62,7 @@
     }
 
     @Override
-    public PropertyDescriptor getDescriptor(final GlobalObject global, final int index) {
+    public PropertyDescriptor getDescriptor(final Global global, final int index) {
         return global.newDataDescriptor(getObject(index), false, true, true);
     }
 }
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/linker/JavaAdapterBytecodeGenerator.java b/nashorn/src/jdk/nashorn/internal/runtime/linker/JavaAdapterBytecodeGenerator.java
index 5aceb20..4951dad 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/linker/JavaAdapterBytecodeGenerator.java
+++ b/nashorn/src/jdk/nashorn/internal/runtime/linker/JavaAdapterBytecodeGenerator.java
@@ -64,6 +64,7 @@
 import jdk.internal.org.objectweb.asm.Opcodes;
 import jdk.internal.org.objectweb.asm.Type;
 import jdk.internal.org.objectweb.asm.commons.InstructionAdapter;
+import jdk.nashorn.internal.objects.Global;
 import jdk.nashorn.internal.runtime.Context;
 import jdk.nashorn.internal.runtime.ScriptFunction;
 import jdk.nashorn.internal.runtime.ScriptObject;
@@ -134,6 +135,7 @@
     static final Type CONTEXT_TYPE       = Type.getType(Context.class);
     static final Type OBJECT_TYPE        = Type.getType(Object.class);
     static final Type SCRIPT_OBJECT_TYPE = Type.getType(ScriptObject.class);
+    static final Type GLOBAL_TYPE        = Type.getType(Global.class);
 
     static final String CONTEXT_TYPE_NAME = CONTEXT_TYPE.getInternalName();
     static final String OBJECT_TYPE_NAME  = OBJECT_TYPE.getInternalName();
@@ -143,8 +145,10 @@
     static final String GLOBAL_FIELD_NAME = "global";
 
     static final String SCRIPT_OBJECT_TYPE_DESCRIPTOR = SCRIPT_OBJECT_TYPE.getDescriptor();
+    static final String GLOBAL_TYPE_DESCRIPTOR = GLOBAL_TYPE.getDescriptor();
 
-    static final String SET_GLOBAL_METHOD_DESCRIPTOR = Type.getMethodDescriptor(Type.VOID_TYPE, SCRIPT_OBJECT_TYPE);
+
+    static final String SET_GLOBAL_METHOD_DESCRIPTOR = Type.getMethodDescriptor(Type.VOID_TYPE, GLOBAL_TYPE);
     static final String VOID_NOARG_METHOD_DESCRIPTOR = Type.getMethodDescriptor(Type.VOID_TYPE);
 
     private static final Type SCRIPT_FUNCTION_TYPE = Type.getType(ScriptFunction.class);
@@ -167,7 +171,7 @@
     private static final String UNSUPPORTED_OPERATION_TYPE_NAME = UNSUPPORTED_OPERATION_TYPE.getInternalName();
 
     private static final String METHOD_HANDLE_TYPE_DESCRIPTOR = METHOD_HANDLE_TYPE.getDescriptor();
-    private static final String GET_GLOBAL_METHOD_DESCRIPTOR = Type.getMethodDescriptor(SCRIPT_OBJECT_TYPE);
+    private static final String GET_GLOBAL_METHOD_DESCRIPTOR = Type.getMethodDescriptor(GLOBAL_TYPE);
     private static final String GET_CLASS_METHOD_DESCRIPTOR = Type.getMethodDescriptor(Type.getType(Class.class));
 
     // Package used when the adapter can't be defined in the adaptee's package (either because it's sealed, or because
@@ -259,7 +263,7 @@
     }
 
     private void generateGlobalFields() {
-        cw.visitField(ACC_PRIVATE | ACC_FINAL | (classOverride ? ACC_STATIC : 0), GLOBAL_FIELD_NAME, SCRIPT_OBJECT_TYPE_DESCRIPTOR, null, null).visitEnd();
+        cw.visitField(ACC_PRIVATE | ACC_FINAL | (classOverride ? ACC_STATIC : 0), GLOBAL_FIELD_NAME, GLOBAL_TYPE_DESCRIPTOR, null, null).visitEnd();
         usedFieldNames.add(GLOBAL_FIELD_NAME);
     }
 
@@ -363,7 +367,7 @@
         }
         // Assign "global = Context.getGlobal()"
         invokeGetGlobalWithNullCheck(mv);
-        mv.putstatic(generatedClassName, GLOBAL_FIELD_NAME, SCRIPT_OBJECT_TYPE_DESCRIPTOR);
+        mv.putstatic(generatedClassName, GLOBAL_FIELD_NAME, GLOBAL_TYPE_DESCRIPTOR);
 
         endInitMethod(mv);
     }
@@ -508,7 +512,7 @@
         // Assign "this.global = Context.getGlobal()"
         mv.visitVarInsn(ALOAD, 0);
         invokeGetGlobalWithNullCheck(mv);
-        mv.putfield(generatedClassName, GLOBAL_FIELD_NAME, SCRIPT_OBJECT_TYPE_DESCRIPTOR);
+        mv.putfield(generatedClassName, GLOBAL_FIELD_NAME, GLOBAL_TYPE_DESCRIPTOR);
 
         endInitMethod(mv);
     }
@@ -652,10 +656,10 @@
         // Load the creatingGlobal object
         if(classOverride) {
             // If class handle is defined, load the static defining global
-            mv.getstatic(generatedClassName, GLOBAL_FIELD_NAME, SCRIPT_OBJECT_TYPE_DESCRIPTOR);
+            mv.getstatic(generatedClassName, GLOBAL_FIELD_NAME, GLOBAL_TYPE_DESCRIPTOR);
         } else {
             mv.visitVarInsn(ALOAD, 0);
-            mv.getfield(generatedClassName, GLOBAL_FIELD_NAME, SCRIPT_OBJECT_TYPE_DESCRIPTOR);
+            mv.getfield(generatedClassName, GLOBAL_FIELD_NAME, GLOBAL_TYPE_DESCRIPTOR);
         }
         // stack: [creatingGlobal, handle]
         final Label setupGlobal = new Label();
@@ -674,7 +678,7 @@
         // stack: [creatingGlobal, creatingGlobal, handle]
 
         // Emit code for switching to the creating global
-        // ScriptObject currentGlobal = Context.getGlobal();
+        // Global currentGlobal = Context.getGlobal();
         invokeGetGlobal(mv);
         mv.dup();
 
@@ -744,7 +748,7 @@
         final Label methodEnd = new Label();
         mv.visitLabel(methodEnd);
 
-        mv.visitLocalVariable("currentGlobal", SCRIPT_OBJECT_TYPE_DESCRIPTOR, null, setupGlobal, methodEnd, currentGlobalVar);
+        mv.visitLocalVariable("currentGlobal", GLOBAL_TYPE_DESCRIPTOR, null, setupGlobal, methodEnd, currentGlobalVar);
         mv.visitLocalVariable("globalsDiffer", Type.INT_TYPE.getDescriptor(), null, setupGlobal, methodEnd, globalsDifferVar);
 
         if(throwableDeclared) {
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/linker/JavaAdapterFactory.java b/nashorn/src/jdk/nashorn/internal/runtime/linker/JavaAdapterFactory.java
index 5e0b890..475ab08 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/linker/JavaAdapterFactory.java
+++ b/nashorn/src/jdk/nashorn/internal/runtime/linker/JavaAdapterFactory.java
@@ -48,7 +48,6 @@
 import java.util.concurrent.ConcurrentHashMap;
 import jdk.internal.dynalink.beans.StaticClass;
 import jdk.internal.dynalink.support.LinkRequestImpl;
-import jdk.nashorn.internal.objects.NativeJava;
 import jdk.nashorn.internal.runtime.Context;
 import jdk.nashorn.internal.runtime.ECMAException;
 import jdk.nashorn.internal.runtime.ScriptFunction;
@@ -68,8 +67,8 @@
  * generate the adapter class itself; see its documentation for details about the generated class.
  * </p><p>
  * You normally don't use this class directly, but rather either create adapters from script using
- * {@link NativeJava#extend(Object, Object...)}, using the {@code new} operator on abstract classes and interfaces (see
- * {@link NativeJava#type(Object, Object)}), or implicitly when passing script functions to Java methods expecting SAM
+ * {@link jdk.nashorn.internal.objects.NativeJava#extend(Object, Object...)}, using the {@code new} operator on abstract classes and interfaces (see
+ * {@link jdk.nashorn.internal.objects.NativeJava#type(Object, Object)}), or implicitly when passing script functions to Java methods expecting SAM
  * types.
  * </p>
  */
@@ -337,6 +336,7 @@
     private static ProtectionDomain createMinimalPermissionDomain() {
         // Generated classes need to have at least the permission to access Nashorn runtime and runtime.linker packages.
         final Permissions permissions = new Permissions();
+        permissions.add(new RuntimePermission("accessClassInPackage.jdk.nashorn.internal.objects"));
         permissions.add(new RuntimePermission("accessClassInPackage.jdk.nashorn.internal.runtime"));
         permissions.add(new RuntimePermission("accessClassInPackage.jdk.nashorn.internal.runtime.linker"));
         return new ProtectionDomain(new CodeSource(null, (CodeSigner[])null), permissions);
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/linker/NashornGuards.java b/nashorn/src/jdk/nashorn/internal/runtime/linker/NashornGuards.java
index 0b720be..ca3e10c 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/linker/NashornGuards.java
+++ b/nashorn/src/jdk/nashorn/internal/runtime/linker/NashornGuards.java
@@ -29,6 +29,11 @@
 
 import java.lang.invoke.MethodHandle;
 import java.lang.invoke.MethodHandles;
+import java.lang.ref.WeakReference;
+import jdk.internal.dynalink.CallSiteDescriptor;
+import jdk.nashorn.internal.codegen.ObjectClassGenerator;
+import jdk.nashorn.internal.objects.Global;
+import jdk.nashorn.internal.runtime.Property;
 import jdk.nashorn.internal.runtime.PropertyMap;
 import jdk.nashorn.internal.runtime.ScriptFunction;
 import jdk.nashorn.internal.runtime.ScriptObject;
@@ -40,6 +45,7 @@
     private static final MethodHandle IS_SCRIPTOBJECT   = findOwnMH("isScriptObject", boolean.class, Object.class);
     private static final MethodHandle IS_SCRIPTFUNCTION = findOwnMH("isScriptFunction", boolean.class, Object.class);
     private static final MethodHandle IS_MAP            = findOwnMH("isMap", boolean.class, Object.class, PropertyMap.class);
+    private static final MethodHandle SAME_OBJECT       = findOwnMH("sameObject", boolean.class, Object.class, WeakReference.class);
     private static final MethodHandle IS_INSTANCEOF_2   = findOwnMH("isInstanceOf2", boolean.class, Object.class, Class.class, Class.class);
 
     // don't create me!
@@ -75,6 +81,55 @@
     }
 
     /**
+     * Determine whether the given callsite needs a guard.
+     * @param property the property, or null
+     * @param desc the callsite descriptor
+     * @return true if a guard should be used for this callsite
+     */
+    static boolean needsGuard(final Property property, final CallSiteDescriptor desc) {
+        return property == null || property.isConfigurable()
+                || property.isBound() || !ObjectClassGenerator.OBJECT_FIELDS_ONLY
+                || !NashornCallSiteDescriptor.isFastScope(desc) || property.canChangeType();
+    }
+
+    /**
+     * Get the guard for a property access. This returns an identity guard for non-configurable global properties
+     * and a map guard for everything else.
+     *
+     * @param sobj the first object in the prototype chain
+     * @param property the property
+     * @param desc the callsite descriptor
+     * @return method handle for guard
+     */
+    public static MethodHandle getGuard(final ScriptObject sobj, final Property property, final CallSiteDescriptor desc) {
+        if (!needsGuard(property, desc)) {
+            return null;
+        }
+        if (NashornCallSiteDescriptor.isScope(desc)) {
+            if (property != null && property.isBound()) {
+                // This is a declared top level variables in main script or eval, use identity guard.
+                return getIdentityGuard(sobj);
+            }
+            if (!(sobj instanceof Global) && (property == null || property.isConfigurable())) {
+                // Undeclared variables in nested evals need stronger guards
+                return combineGuards(getIdentityGuard(sobj), getMapGuard(sobj.getMap()));
+            }
+        }
+        return getMapGuard(sobj.getMap());
+    }
+
+
+    /**
+     * Get a guard that checks referential identity of the current object.
+     *
+     * @param sobj the self object
+     * @return true if same self object instance
+     */
+    public static MethodHandle getIdentityGuard(final ScriptObject sobj) {
+        return MH.insertArguments(SAME_OBJECT, 1, new WeakReference<>(sobj));
+    }
+
+    /**
      * Get a guard that checks if in item is an instance of either of two classes.
      *
      * @param class1 the first class
@@ -112,6 +167,11 @@
     }
 
     @SuppressWarnings("unused")
+    private static boolean sameObject(final Object self, final WeakReference<ScriptObject> ref) {
+        return self == ref.get();
+    }
+
+    @SuppressWarnings("unused")
     private static boolean isInstanceOf2(final Object self, final Class<?> class1, final Class<?> class2) {
         return class1.isInstance(self) || class2.isInstance(self);
     }
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/linker/NashornPrimitiveLinker.java b/nashorn/src/jdk/nashorn/internal/runtime/linker/NashornPrimitiveLinker.java
index 5cc1cd2..22135bc 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/linker/NashornPrimitiveLinker.java
+++ b/nashorn/src/jdk/nashorn/internal/runtime/linker/NashornPrimitiveLinker.java
@@ -37,9 +37,9 @@
 import jdk.internal.dynalink.linker.LinkerServices;
 import jdk.internal.dynalink.linker.TypeBasedGuardingDynamicLinker;
 import jdk.internal.dynalink.support.TypeUtilities;
+import jdk.nashorn.internal.objects.Global;
 import jdk.nashorn.internal.runtime.ConsString;
 import jdk.nashorn.internal.runtime.Context;
-import jdk.nashorn.internal.runtime.GlobalObject;
 
 /**
  * Internal linker for String, Boolean, and Number objects, only ever used by Nashorn engine and not exposed to other
@@ -62,7 +62,7 @@
         final LinkRequest request = origRequest.withoutRuntimeContext(); // Nashorn has no runtime context
 
         final Object self = request.getReceiver();
-        final GlobalObject global = (GlobalObject) Context.getGlobal();
+        final Global global = Context.getGlobal();
         final NashornCallSiteDescriptor desc = (NashornCallSiteDescriptor) request.getCallSiteDescriptor();
 
         return Bootstrap.asType(global.primitiveLookup(request, self), linkerServices, desc);
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/linker/PrimitiveLookup.java b/nashorn/src/jdk/nashorn/internal/runtime/linker/PrimitiveLookup.java
index c9b5eaa..7665be7 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/linker/PrimitiveLookup.java
+++ b/nashorn/src/jdk/nashorn/internal/runtime/linker/PrimitiveLookup.java
@@ -35,6 +35,7 @@
 import jdk.internal.dynalink.support.CallSiteDescriptorFactory;
 import jdk.internal.dynalink.support.Guards;
 import jdk.nashorn.internal.lookup.Lookup;
+import jdk.nashorn.internal.runtime.FindProperty;
 import jdk.nashorn.internal.runtime.ScriptObject;
 
 /**
@@ -61,8 +62,9 @@
      * type {@code receiverClass}.
      */
     public static GuardedInvocation lookupPrimitive(final LinkRequest request, final Class<?> receiverClass,
-                                                    final ScriptObject wrappedReceiver, final MethodHandle wrapFilter) {
-        return lookupPrimitive(request, Guards.getInstanceOfGuard(receiverClass), wrappedReceiver, wrapFilter);
+                                                    final ScriptObject wrappedReceiver, final MethodHandle wrapFilter,
+                                                    final MethodHandle protoFilter) {
+        return lookupPrimitive(request, Guards.getInstanceOfGuard(receiverClass), wrappedReceiver, wrapFilter, protoFilter);
     }
 
     /**
@@ -79,7 +81,8 @@
      * type (that is implied by both {@code guard} and {@code wrappedReceiver}).
      */
     public static GuardedInvocation lookupPrimitive(final LinkRequest request, final MethodHandle guard,
-                                                    final ScriptObject wrappedReceiver, final MethodHandle wrapFilter) {
+                                                    final ScriptObject wrappedReceiver, final MethodHandle wrapFilter,
+                                                    final MethodHandle protoFilter) {
         final CallSiteDescriptor desc = request.getCallSiteDescriptor();
         final String operator = CallSiteDescriptorFactory.tokenizeOperators(desc).get(0);
         if ("setProp".equals(operator) || "setElem".equals(operator)) {
@@ -93,9 +96,23 @@
 
         if(desc.getNameTokenCount() > 2) {
             final String name = desc.getNameToken(CallSiteDescriptor.NAME_OPERAND);
-            if(wrappedReceiver.findProperty(name, true) == null) {
+            final FindProperty find = wrappedReceiver.findProperty(name, true);
+            if(find == null) {
                 // Give up early, give chance to BeanLinker and NashornBottomLinker to deal with it.
                 return null;
+            } else if (find.isInherited() && !find.getProperty().hasGetterFunction(find.getOwner())) {
+                // If property is found in the prototype object bind the method handle directly to
+                // the proto filter instead of going through wrapper instantiation below.
+                final ScriptObject proto = wrappedReceiver.getProto();
+                final GuardedInvocation link = proto.lookup(desc, request);
+
+                if (link != null) {
+                    final MethodHandle invocation = link.getInvocation();
+                    final MethodHandle adaptedInvocation = MH.asType(invocation, invocation.type().changeParameterType(0, Object.class));
+                    final MethodHandle method = MH.filterArguments(adaptedInvocation, 0, protoFilter);
+                    final MethodHandle protoGuard = MH.filterArguments(link.getGuard(), 0, protoFilter);
+                    return new GuardedInvocation(method, NashornGuards.combineGuards(guard, protoGuard));
+                }
             }
         }
         final GuardedInvocation link = wrappedReceiver.lookup(desc, request);
diff --git a/nashorn/src/jdk/nashorn/internal/runtime/resources/Messages.properties b/nashorn/src/jdk/nashorn/internal/runtime/resources/Messages.properties
index e1c4d1f..47248fc 100644
--- a/nashorn/src/jdk/nashorn/internal/runtime/resources/Messages.properties
+++ b/nashorn/src/jdk/nashorn/internal/runtime/resources/Messages.properties
@@ -79,6 +79,7 @@
 type.error.not.a.constructor={0} is not a constructor function
 type.error.not.a.file={0} is not a File
 type.error.not.a.bytebuffer={0} is not a java.nio.ByteBuffer
+type.error.not.an.arraybuffer.in.dataview=First arg to DataView constructor must be an ArrayBuffer
 
 # operations not permitted on undefined
 type.error.cant.call.undefined=Cannot call undefined
@@ -137,6 +138,9 @@
 type.error.method.not.constructor=Java method {0} can't be used as a constructor.
 type.error.env.not.object=$ENV must be an Object.
 type.error.unsupported.java.to.type=Unsupported Java.to target type {0}.
+
+range.error.dataview.constructor.offset=Wrong offset or length in DataView constructor
+range.error.dataview.offset=Offset is outside the bounds of the DataView
 range.error.inappropriate.array.length=inappropriate array length: {0}
 range.error.inappropriate.array.buffer.length=inappropriate array buffer length: {0}
 range.error.invalid.fraction.digits=fractionDigits argument to {0} must be in [0, 20]
diff --git a/nashorn/src/jdk/nashorn/tools/Shell.java b/nashorn/src/jdk/nashorn/tools/Shell.java
index ad19484..ad833d8 100644
--- a/nashorn/src/jdk/nashorn/tools/Shell.java
+++ b/nashorn/src/jdk/nashorn/tools/Shell.java
@@ -42,6 +42,7 @@
 import jdk.nashorn.internal.ir.FunctionNode;
 import jdk.nashorn.internal.ir.debug.ASTWriter;
 import jdk.nashorn.internal.ir.debug.PrintVisitor;
+import jdk.nashorn.internal.objects.Global;
 import jdk.nashorn.internal.parser.Parser;
 import jdk.nashorn.internal.runtime.Context;
 import jdk.nashorn.internal.runtime.ErrorManager;
@@ -148,7 +149,7 @@
             return COMMANDLINE_ERROR;
         }
 
-        final ScriptObject global = context.createGlobal();
+        final Global global = context.createGlobal();
         final ScriptEnvironment env = context.getEnv();
         final List<String> files = env.getFiles();
         if (files.isEmpty()) {
@@ -231,8 +232,8 @@
      * @return error code
      * @throws IOException when any script file read results in I/O error
      */
-    private static int compileScripts(final Context context, final ScriptObject global, final List<String> files) throws IOException {
-        final ScriptObject oldGlobal = Context.getGlobal();
+    private static int compileScripts(final Context context, final Global global, final List<String> files) throws IOException {
+        final Global oldGlobal = Context.getGlobal();
         final boolean globalChanged = (oldGlobal != global);
         final ScriptEnvironment env = context.getEnv();
         try {
@@ -281,8 +282,8 @@
      * @return error code
      * @throws IOException when any script file read results in I/O error
      */
-    private int runScripts(final Context context, final ScriptObject global, final List<String> files) throws IOException {
-        final ScriptObject oldGlobal = Context.getGlobal();
+    private int runScripts(final Context context, final Global global, final List<String> files) throws IOException {
+        final Global oldGlobal = Context.getGlobal();
         final boolean globalChanged = (oldGlobal != global);
         try {
             if (globalChanged) {
@@ -339,8 +340,8 @@
      * @return error code
      * @throws IOException when any script file read results in I/O error
      */
-    private static int runFXScripts(final Context context, final ScriptObject global, final List<String> files) throws IOException {
-        final ScriptObject oldGlobal = Context.getGlobal();
+    private static int runFXScripts(final Context context, final Global global, final List<String> files) throws IOException {
+        final Global oldGlobal = Context.getGlobal();
         final boolean globalChanged = (oldGlobal != global);
         try {
             if (globalChanged) {
@@ -389,11 +390,11 @@
      * @return return code
      */
     @SuppressWarnings("resource")
-    private static int readEvalPrint(final Context context, final ScriptObject global) {
+    private static int readEvalPrint(final Context context, final Global global) {
         final String prompt = bundle.getString("shell.prompt");
         final BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
         final PrintWriter err = context.getErr();
-        final ScriptObject oldGlobal = Context.getGlobal();
+        final Global oldGlobal = Context.getGlobal();
         final boolean globalChanged = (oldGlobal != global);
         final ScriptEnvironment env = context.getEnv();
 
diff --git a/nashorn/test/script/basic/JDK-8034055.js b/nashorn/test/script/basic/JDK-8034055.js
new file mode 100644
index 0000000..0a21d9f
--- /dev/null
+++ b/nashorn/test/script/basic/JDK-8034055.js
@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2010, 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.
+ * 
+ * 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.
+ */
+
+/**
+ * JDK-8034055: delete on global object not properly guarded
+ *
+ * @test
+ * @run
+ */
+
+
+var global = this;
+var x;
+
+function test(defineGlobals) {
+    if (defineGlobals) {
+        global.x = 1;
+        global.y = 2;
+    }
+    try {
+        print(x);
+        print(y);
+    } catch (e) {
+        print(e);
+    } finally {
+        print(delete global.x);
+        print(delete global.y);
+    }
+}
+
+// Repeatedly set and delete global variables
+test(true);
+test(false);
+test(true);
+test(false);
diff --git a/nashorn/test/script/basic/JDK-8034055.js.EXPECTED b/nashorn/test/script/basic/JDK-8034055.js.EXPECTED
new file mode 100644
index 0000000..c947f4a
--- /dev/null
+++ b/nashorn/test/script/basic/JDK-8034055.js.EXPECTED
@@ -0,0 +1,16 @@
+1
+2
+false
+true
+1
+ReferenceError: "y" is not defined
+false
+true
+1
+2
+false
+true
+1
+ReferenceError: "y" is not defined
+false
+true
diff --git a/nashorn/test/script/basic/dataview_endian.js b/nashorn/test/script/basic/dataview_endian.js
new file mode 100644
index 0000000..f7607c0
--- /dev/null
+++ b/nashorn/test/script/basic/dataview_endian.js
@@ -0,0 +1,70 @@
+/*
+ * 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.
+ * 
+ * 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.
+ */
+
+/**
+ * JDK-8015958: DataView constructor is not defined
+ *
+ * @test
+ * @run
+ */
+
+// set/get endianess checks
+
+var buffer = new ArrayBuffer(4);
+var dv = new DataView(buffer);
+
+// write (default) big endian, read big/little endian
+dv.setUint16(0, 0xABCD);
+Assert.assertEquals(dv.getUint16(0), 0xABCD);
+Assert.assertEquals(dv.getUint16(0, false), 0xABCD);
+Assert.assertEquals(dv.getUint16(0, true), 0xCDAB);
+
+// write little endian, read big/little endian
+dv.setUint16(0, 0xABCD, true);
+Assert.assertEquals(dv.getUint16(0), 0xCDAB);
+Assert.assertEquals(dv.getUint16(0, false), 0xCDAB);
+Assert.assertEquals(dv.getUint16(0, true), 0xABCD);
+
+// write explicit big endian, read big/little endian
+dv.setUint16(0, 0xABCD, false);
+Assert.assertEquals(dv.getUint16(0), 0xABCD);
+Assert.assertEquals(dv.getUint16(0, false), 0xABCD);
+Assert.assertEquals(dv.getUint16(0, true), 0xCDAB);
+
+// write (default) big endian, read big/little endian
+dv.setUint32(0, 0xABCDEF89);
+Assert.assertEquals(dv.getUint32(0), 0xABCDEF89);
+Assert.assertEquals(dv.getUint32(0, false), 0xABCDEF89);
+Assert.assertEquals(dv.getUint32(0, true), 0x89EFCDAB);
+
+// write little endian, read big/little endian
+dv.setUint32(0, 0xABCDEF89, true);
+Assert.assertEquals(dv.getUint32(0), 0x89EFCDAB);
+Assert.assertEquals(dv.getUint32(0, false), 0x89EFCDAB);
+Assert.assertEquals(dv.getUint32(0, true), 0xABCDEF89);
+
+// write explicit big endian, read big/little endian
+dv.setUint32(0, 0xABCDEF89, false);
+Assert.assertEquals(dv.getUint32(0), 0xABCDEF89);
+Assert.assertEquals(dv.getUint32(0, false), 0xABCDEF89);
+Assert.assertEquals(dv.getUint32(0, true), 0x89EFCDAB);
diff --git a/nashorn/test/script/basic/dataview_getset.js b/nashorn/test/script/basic/dataview_getset.js
new file mode 100644
index 0000000..8c7a994
--- /dev/null
+++ b/nashorn/test/script/basic/dataview_getset.js
@@ -0,0 +1,93 @@
+/*
+ * 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.
+ * 
+ * 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.
+ */
+
+/**
+ * JDK-8015958: DataView constructor is not defined
+ *
+ * @test
+ * @run
+ */
+
+// checking get/set of values of various types
+// Also basic endianess check.
+
+var Float = Java.type("java.lang.Float");
+var Double = Java.type("java.lang.Double");
+
+var DOUBLE_MIN = Double.MIN_VALUE;
+var DOUBLE_MIN_NORMAL = Double.MIN_NORMAL;
+var FLOAT_MIN = Float.MIN_VALUE;
+var FLOAT_MIN_NORMAL = Float.MIN_NORMAL;
+
+var buffer = new ArrayBuffer(12);
+var dv = new DataView(buffer);
+
+dv.setInt8(1, 123);
+Assert.assertEquals(dv.getInt8(1), 123);
+dv.setInt8(1, 123, true);
+Assert.assertEquals(dv.getInt8(1, true), 123);
+
+dv.setUint8(1, 255);
+Assert.assertEquals(dv.getUint8(1), 255);
+dv.setUint8(1, 255, true);
+Assert.assertEquals(dv.getUint8(1, true), 255);
+
+dv.setInt16(1, 1234);
+Assert.assertEquals(dv.getInt16(1), 1234);
+dv.setInt16(1, 1234, true);
+Assert.assertEquals(dv.getInt16(1, true), 1234);
+
+dv.setUint16(1, 65535);
+Assert.assertEquals(dv.getUint16(1), 65535);
+dv.setUint16(1, 65535, true);
+Assert.assertEquals(dv.getUint16(1, true), 65535);
+
+dv.setInt32(1, 1234);
+Assert.assertEquals(dv.getInt32(1), 1234);
+dv.setInt32(1, 1234, true);
+Assert.assertEquals(dv.getInt32(1, true), 1234);
+
+dv.setUint32(1, 4294967295);
+Assert.assertEquals(dv.getUint32(1), 4294967295);
+dv.setUint32(1, 4294967295, true);
+Assert.assertEquals(dv.getUint32(1, true), 4294967295);
+
+dv.setFloat64(1, Math.PI);
+Assert.assertEquals(dv.getFloat64(1), Math.PI, DOUBLE_MIN);
+dv.setFloat64(1, Math.PI, true);
+Assert.assertEquals(dv.getFloat64(1, true), Math.PI, DOUBLE_MIN);
+
+dv.setFloat64(1, DOUBLE_MIN_NORMAL);
+Assert.assertEquals(dv.getFloat64(1), DOUBLE_MIN_NORMAL, DOUBLE_MIN);
+dv.setFloat64(1, DOUBLE_MIN_NORMAL, true);
+Assert.assertEquals(dv.getFloat64(1, true), DOUBLE_MIN_NORMAL, DOUBLE_MIN);
+
+dv.setFloat32(1, 1.414);
+Assert["assertEquals(float, float, float)"](dv.getFloat32(1), 1.414, FLOAT_MIN);
+dv.setFloat32(1, 1.414, true);
+Assert["assertEquals(float, float, float)"](dv.getFloat32(1, true), 1.414, FLOAT_MIN);
+
+dv.setFloat32(1, FLOAT_MIN_NORMAL);
+Assert["assertEquals(float, float, float)"](dv.getFloat32(1), FLOAT_MIN_NORMAL, FLOAT_MIN);
+dv.setFloat32(1, FLOAT_MIN_NORMAL, true);
+Assert["assertEquals(float, float, float)"](dv.getFloat32(1, true), FLOAT_MIN_NORMAL, FLOAT_MIN);
diff --git a/nashorn/test/script/basic/dataview_new.js b/nashorn/test/script/basic/dataview_new.js
new file mode 100644
index 0000000..78f8183
--- /dev/null
+++ b/nashorn/test/script/basic/dataview_new.js
@@ -0,0 +1,71 @@
+/*
+ * 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.
+ * 
+ * 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.
+ */
+
+/**
+ * JDK-8015958: DataView constructor is not defined
+ *
+ * @test
+ * @run
+ */
+
+// basic DataView constructor checks.
+
+// check ArrayBufferView property values of DataView instance
+function check(dv, buf, offset, length) {
+    if (dv.buffer !== buf) {
+        fail("DataView.buffer is wrong");
+    }
+
+    if (dv.byteOffset != offset) {
+        fail("DataView.byteOffset = " + dv.byteOffset + ", expected " + offset);
+    }
+
+    if (dv.byteLength != length) {
+        fail("DataView.byteLength = " + dv.byteLength + ", expected " + length);
+    }
+}
+
+var buffer = new ArrayBuffer(12);
+check(new DataView(buffer), buffer, 0, 12);
+check(new DataView(buffer, 2), buffer, 2, 10);
+check(new DataView(buffer, 4, 8), buffer, 4, 8);
+
+// make sure expected error is thrown
+function checkError(callback, ErrorType) {
+    try {
+        callback();
+        fail("Should have thrown " + ErrorType.name);
+    } catch (e) {
+        if (! (e instanceof ErrorType)) {
+            fail("Expected " + ErrorType.name + " got " + e);
+        }
+    }
+}
+
+// non ArrayBuffer as first arg
+checkError(function() { new DataView(344) }, TypeError);
+
+// illegal offset/length values
+checkError(function() { new DataView(buffer, -1) }, RangeError);
+checkError(function() { new DataView(buffer, 15) }, RangeError);
+checkError(function() { new DataView(buffer, 1, 32) }, RangeError);
diff --git a/nashorn/test/src/jdk/nashorn/api/scripting/ScopeTest.java b/nashorn/test/src/jdk/nashorn/api/scripting/ScopeTest.java
index a18055b..dc27d82 100644
--- a/nashorn/test/src/jdk/nashorn/api/scripting/ScopeTest.java
+++ b/nashorn/test/src/jdk/nashorn/api/scripting/ScopeTest.java
@@ -245,4 +245,320 @@
         sb.put("x", "newX");
         assertTrue(e.eval("x", ctx).equals("newX"));
     }
+
+    /**
+     * Test multi-threaded access to defined global variables for shared script classes with multiple globals.
+     */
+    @Test
+    public static void multiThreadedVarTest() throws ScriptException, InterruptedException {
+        final ScriptEngineManager m = new ScriptEngineManager();
+        final ScriptEngine e = m.getEngineByName("nashorn");
+        final Bindings b = e.createBindings();
+        final ScriptContext origContext = e.getContext();
+        final ScriptContext newCtxt = new SimpleScriptContext();
+        newCtxt.setBindings(b, ScriptContext.ENGINE_SCOPE);
+        final String sharedScript = "foo";
+
+        assertEquals(e.eval("var foo = 'original context';", origContext), null);
+        assertEquals(e.eval("var foo = 'new context';", newCtxt), null);
+
+        final Thread t1 = new Thread(new ScriptRunner(e, origContext, sharedScript, "original context", 1000));
+        final Thread t2 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, "new context", 1000));
+        t1.start();
+        t2.start();
+        t1.join();
+        t2.join();
+
+        assertEquals(e.eval("var foo = 'newer context';", newCtxt), null);
+        final Thread t3 = new Thread(new ScriptRunner(e, origContext, sharedScript, "original context", 1000));
+        final Thread t4 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, "newer context", 1000));
+
+        t3.start();
+        t4.start();
+        t3.join();
+        t4.join();
+
+        assertEquals(e.eval(sharedScript), "original context");
+        assertEquals(e.eval(sharedScript, newCtxt), "newer context");
+    }
+
+    /**
+     * Test multi-threaded access to undefined global variables for shared script classes with multiple globals.
+     */
+    @Test
+    public static void multiThreadedGlobalTest() throws ScriptException, InterruptedException {
+        final ScriptEngineManager m = new ScriptEngineManager();
+        final ScriptEngine e = m.getEngineByName("nashorn");
+        final Bindings b = e.createBindings();
+        final ScriptContext origContext = e.getContext();
+        final ScriptContext newCtxt = new SimpleScriptContext();
+        newCtxt.setBindings(b, ScriptContext.ENGINE_SCOPE);
+
+        assertEquals(e.eval("foo = 'original context';", origContext), "original context");
+        assertEquals(e.eval("foo = 'new context';", newCtxt), "new context");
+        final String sharedScript = "foo";
+
+        final Thread t1 = new Thread(new ScriptRunner(e, origContext, sharedScript, "original context", 1000));
+        final Thread t2 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, "new context", 1000));
+        t1.start();
+        t2.start();
+        t1.join();
+        t2.join();
+
+        Object obj3 = e.eval("delete foo; foo = 'newer context';", newCtxt);
+        assertEquals(obj3, "newer context");
+        final Thread t3 = new Thread(new ScriptRunner(e, origContext, sharedScript, "original context", 1000));
+        final Thread t4 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, "newer context", 1000));
+
+        t3.start();
+        t4.start();
+        t3.join();
+        t4.join();
+
+        Assert.assertEquals(e.eval(sharedScript), "original context");
+        Assert.assertEquals(e.eval(sharedScript, newCtxt), "newer context");
+    }
+
+    /**
+     * Test multi-threaded access using the postfix ++ operator for shared script classes with multiple globals.
+     */
+    @Test
+    public static void multiThreadedIncTest() throws ScriptException, InterruptedException {
+        final ScriptEngineManager m = new ScriptEngineManager();
+        final ScriptEngine e = m.getEngineByName("nashorn");
+        final Bindings b = e.createBindings();
+        final ScriptContext origContext = e.getContext();
+        final ScriptContext newCtxt = new SimpleScriptContext();
+        newCtxt.setBindings(b, ScriptContext.ENGINE_SCOPE);
+
+        assertEquals(e.eval("var x = 0;", origContext), null);
+        assertEquals(e.eval("var x = 2;", newCtxt), null);
+        final String sharedScript = "x++;";
+
+        final Thread t1 = new Thread(new Runnable() {
+            @Override
+            public void run() {
+                try {
+                    for (int i = 0; i < 1000; i++) {
+                        assertEquals(e.eval(sharedScript, origContext), (double)i);
+                    }
+                } catch (ScriptException se) {
+                    fail(se.toString());
+                }
+            }
+        });
+        final Thread t2 = new Thread(new Runnable() {
+            @Override
+            public void run() {
+                try {
+                    for (int i = 2; i < 1000; i++) {
+                        assertEquals(e.eval(sharedScript, newCtxt), (double)i);
+                    }
+                } catch (ScriptException se) {
+                    fail(se.toString());
+                }
+            }
+        });
+        t1.start();
+        t2.start();
+        t1.join();
+        t2.join();
+    }
+
+    /**
+     * Test multi-threaded access to primitive prototype properties for shared script classes with multiple globals.
+     */
+    @Test
+    public static void multiThreadedPrimitiveTest() throws ScriptException, InterruptedException {
+        final ScriptEngineManager m = new ScriptEngineManager();
+        final ScriptEngine e = m.getEngineByName("nashorn");
+        final Bindings b = e.createBindings();
+        final ScriptContext origContext = e.getContext();
+        final ScriptContext newCtxt = new SimpleScriptContext();
+        newCtxt.setBindings(b, ScriptContext.ENGINE_SCOPE);
+
+        Object obj1 = e.eval("String.prototype.foo = 'original context';", origContext);
+        Object obj2 = e.eval("String.prototype.foo = 'new context';", newCtxt);
+        assertEquals(obj1, "original context");
+        assertEquals(obj2, "new context");
+        final String sharedScript = "''.foo";
+
+        final Thread t1 = new Thread(new ScriptRunner(e, origContext, sharedScript, "original context", 1000));
+        final Thread t2 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, "new context", 1000));
+        t1.start();
+        t2.start();
+        t1.join();
+        t2.join();
+
+        Object obj3 = e.eval("delete String.prototype.foo; Object.prototype.foo = 'newer context';", newCtxt);
+        assertEquals(obj3, "newer context");
+        final Thread t3 = new Thread(new ScriptRunner(e, origContext, sharedScript, "original context", 1000));
+        final Thread t4 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, "newer context", 1000));
+
+        t3.start();
+        t4.start();
+        t3.join();
+        t4.join();
+
+        Assert.assertEquals(e.eval(sharedScript), "original context");
+        Assert.assertEquals(e.eval(sharedScript, newCtxt), "newer context");
+    }
+
+    /**
+     * Test multi-threaded scope function invocation for shared script classes with multiple globals.
+     */
+    @Test
+    public static void multiThreadedFunctionTest() throws ScriptException, InterruptedException {
+        final ScriptEngineManager m = new ScriptEngineManager();
+        final ScriptEngine e = m.getEngineByName("nashorn");
+        final Bindings b = e.createBindings();
+        final ScriptContext origContext = e.getContext();
+        final ScriptContext newCtxt = new SimpleScriptContext();
+        newCtxt.setBindings(b, ScriptContext.ENGINE_SCOPE);
+
+        e.eval(new URLReader(ScopeTest.class.getResource("resources/func.js")), origContext);
+        assertEquals(origContext.getAttribute("scopeVar"), 1);
+        assertEquals(e.eval("scopeTest()"), 1);
+
+        e.eval(new URLReader(ScopeTest.class.getResource("resources/func.js")), newCtxt);
+        assertEquals(newCtxt.getAttribute("scopeVar"), 1);
+        assertEquals(e.eval("scopeTest();", newCtxt), 1);
+
+        assertEquals(e.eval("scopeVar = 3;", newCtxt), 3);
+        assertEquals(newCtxt.getAttribute("scopeVar"), 3);
+
+
+        final Thread t1 = new Thread(new ScriptRunner(e, origContext, "scopeTest()", 1, 1000));
+        final Thread t2 = new Thread(new ScriptRunner(e, newCtxt, "scopeTest()", 3, 1000));
+
+        t1.start();
+        t2.start();
+        t1.join();
+        t2.join();
+
+    }
+
+    /**
+     * Test multi-threaded access to global getters and setters for shared script classes with multiple globals.
+     */
+    @Test
+    public static void getterSetterTest() throws ScriptException, InterruptedException {
+        final ScriptEngineManager m = new ScriptEngineManager();
+        final ScriptEngine e = m.getEngineByName("nashorn");
+        final Bindings b = e.createBindings();
+        final ScriptContext origContext = e.getContext();
+        final ScriptContext newCtxt = new SimpleScriptContext();
+        newCtxt.setBindings(b, ScriptContext.ENGINE_SCOPE);
+        final String sharedScript = "accessor1";
+
+        e.eval(new URLReader(ScopeTest.class.getResource("resources/gettersetter.js")), origContext);
+        assertEquals(e.eval("accessor1 = 1;"), 1);
+        assertEquals(e.eval(sharedScript), 1);
+
+        e.eval(new URLReader(ScopeTest.class.getResource("resources/gettersetter.js")), newCtxt);
+        assertEquals(e.eval("accessor1 = 2;", newCtxt), 2);
+        assertEquals(e.eval(sharedScript, newCtxt), 2);
+
+
+        final Thread t1 = new Thread(new ScriptRunner(e, origContext, sharedScript, 1, 1000));
+        final Thread t2 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, 2, 1000));
+
+        t1.start();
+        t2.start();
+        t1.join();
+        t2.join();
+
+        assertEquals(e.eval(sharedScript), 1);
+        assertEquals(e.eval(sharedScript, newCtxt), 2);
+        assertEquals(e.eval("v"), 1);
+        assertEquals(e.eval("v", newCtxt), 2);
+    }
+
+    /**
+     * Test multi-threaded access to global getters and setters for shared script classes with multiple globals.
+     */
+    @Test
+    public static void getterSetter2Test() throws ScriptException, InterruptedException {
+        final ScriptEngineManager m = new ScriptEngineManager();
+        final ScriptEngine e = m.getEngineByName("nashorn");
+        final Bindings b = e.createBindings();
+        final ScriptContext origContext = e.getContext();
+        final ScriptContext newCtxt = new SimpleScriptContext();
+        newCtxt.setBindings(b, ScriptContext.ENGINE_SCOPE);
+        final String sharedScript = "accessor2";
+
+        e.eval(new URLReader(ScopeTest.class.getResource("resources/gettersetter.js")), origContext);
+        assertEquals(e.eval("accessor2 = 1;"), 1);
+        assertEquals(e.eval(sharedScript), 1);
+
+        e.eval(new URLReader(ScopeTest.class.getResource("resources/gettersetter.js")), newCtxt);
+        assertEquals(e.eval("accessor2 = 2;", newCtxt), 2);
+        assertEquals(e.eval(sharedScript, newCtxt), 2);
+
+
+        final Thread t1 = new Thread(new ScriptRunner(e, origContext, sharedScript, 1, 1000));
+        final Thread t2 = new Thread(new ScriptRunner(e, newCtxt, sharedScript, 2, 1000));
+
+        t1.start();
+        t2.start();
+        t1.join();
+        t2.join();
+
+        assertEquals(e.eval(sharedScript), 1);
+        assertEquals(e.eval(sharedScript, newCtxt), 2);
+        assertEquals(e.eval("x"), 1);
+        assertEquals(e.eval("x", newCtxt), 2);
+    }
+
+    /**
+     * Test "slow" scopes involving {@code with} and {@code eval} statements for shared script classes with multiple globals.
+     */
+    @Test
+    public static void testSlowScope() throws ScriptException, InterruptedException {
+        final ScriptEngineManager m = new ScriptEngineManager();
+        final ScriptEngine e = m.getEngineByName("nashorn");
+
+        for (int i = 0; i < 100; i++) {
+            final Bindings b = e.createBindings();
+            final ScriptContext ctxt = new SimpleScriptContext();
+            ctxt.setBindings(b, ScriptContext.ENGINE_SCOPE);
+
+            e.eval(new URLReader(ScopeTest.class.getResource("resources/witheval.js")), ctxt);
+            assertEquals(e.eval("a", ctxt), 1);
+            assertEquals(b.get("a"), 1);
+            assertEquals(e.eval("b", ctxt), 3);
+            assertEquals(b.get("b"), 3);
+            assertEquals(e.eval("c", ctxt), 10);
+            assertEquals(b.get("c"), 10);
+        }
+    }
+
+    private static class ScriptRunner implements Runnable {
+
+        final ScriptEngine engine;
+        final ScriptContext context;
+        final String source;
+        final Object expected;
+        final int iterations;
+
+        ScriptRunner(final ScriptEngine engine, final ScriptContext context, final String source, final Object expected, final int iterations) {
+            this.engine = engine;
+            this.context = context;
+            this.source = source;
+            this.expected = expected;
+            this.iterations = iterations;
+        }
+
+        @Override
+        public void run() {
+            try {
+                for (int i = 0; i < iterations; i++) {
+                    assertEquals(engine.eval(source, context), expected);
+                }
+            } catch (ScriptException se) {
+                throw new RuntimeException(se);
+            }
+        }
+    }
+
 }
diff --git a/nashorn/test/src/jdk/nashorn/api/scripting/resources/func.js b/nashorn/test/src/jdk/nashorn/api/scripting/resources/func.js
new file mode 100644
index 0000000..477bd1a
--- /dev/null
+++ b/nashorn/test/src/jdk/nashorn/api/scripting/resources/func.js
@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2010, 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.
+ */
+
+// This script is loaded from jdk.nashorn.api.scripting.ScopeTest to test script class sharing and reuse.
+
+var scopeVar = 1;
+var global = this;
+undefGlobal = this;
+
+function scopeTest() {
+    if (this !== global) {
+        throw new Error("this !== global");
+    }
+    if (this !== undefGlobal) {
+        throw new Error("this !== undefinedGlobal")
+    }
+    return scopeVar;
+}
+
+scopeTest();
diff --git a/nashorn/test/src/jdk/nashorn/api/scripting/resources/gettersetter.js b/nashorn/test/src/jdk/nashorn/api/scripting/resources/gettersetter.js
new file mode 100644
index 0000000..51e2472
--- /dev/null
+++ b/nashorn/test/src/jdk/nashorn/api/scripting/resources/gettersetter.js
@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2010, 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.
+ */
+
+// This script is loaded from jdk.nashorn.api.scripting.ScopeTest to test script class sharing and reuse.
+
+var v;
+
+Object.defineProperty(this, "accessor1", {
+    get: function() { return v; },
+    set: function(n) { v = n; }
+});
+
+Object.defineProperty(this, "accessor2", {
+    get: function() { return x; },
+    set: function(n) { x = n; }
+});
diff --git a/nashorn/test/src/jdk/nashorn/api/scripting/resources/witheval.js b/nashorn/test/src/jdk/nashorn/api/scripting/resources/witheval.js
new file mode 100644
index 0000000..6041d5b
--- /dev/null
+++ b/nashorn/test/src/jdk/nashorn/api/scripting/resources/witheval.js
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2010, 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.
+ */
+
+// This script is loaded from jdk.nashorn.api.scripting.ScopeTest to test script class sharing and reuse.
+
+var a;
+
+function outer(p, e) {
+    eval(e);
+    with(p) {
+        function inner() {
+            a = 1;
+            c = 10;
+            if (a !== 1) {
+                throw new Error("a !== 1");
+            }
+            if (b !== 3) {
+                throw new Error("b !== 3");
+            }
+            if (c !== 10) {
+                throw new Error("c !== 10");
+            }
+        }
+        inner();
+    }
+}
+
+outer({}, "b = 3;");
+
+if (a !== 1) {
+    throw new Error("a !== 1");
+}
+if (b !== 3) {
+    throw new Error("b !== 3");
+}
+if (c !== 10) {
+    throw new Error("c !== 10");
+}
diff --git a/nashorn/test/src/jdk/nashorn/internal/codegen/CompilerTest.java b/nashorn/test/src/jdk/nashorn/internal/codegen/CompilerTest.java
index 00d79ac..ac43810 100644
--- a/nashorn/test/src/jdk/nashorn/internal/codegen/CompilerTest.java
+++ b/nashorn/test/src/jdk/nashorn/internal/codegen/CompilerTest.java
@@ -28,6 +28,7 @@
 import java.io.File;
 import java.io.PrintWriter;
 import java.io.StringWriter;
+import jdk.nashorn.internal.objects.Global;
 import jdk.nashorn.internal.runtime.Context;
 import jdk.nashorn.internal.runtime.ErrorManager;
 import jdk.nashorn.internal.runtime.ScriptFunction;
@@ -58,7 +59,7 @@
     }
 
     private Context context;
-    private ScriptObject global;
+    private Global  global;
 
     @BeforeClass
     public void setupTest() {
@@ -146,7 +147,7 @@
             log("Begin compiling " + file.getAbsolutePath());
         }
 
-        final ScriptObject oldGlobal = Context.getGlobal();
+        final Global oldGlobal = Context.getGlobal();
         final boolean globalChanged = (oldGlobal != global);
 
         try {
diff --git a/nashorn/test/src/jdk/nashorn/internal/performance/PerformanceWrapper.java b/nashorn/test/src/jdk/nashorn/internal/performance/PerformanceWrapper.java
index 999f6fa..ce96921 100644
--- a/nashorn/test/src/jdk/nashorn/internal/performance/PerformanceWrapper.java
+++ b/nashorn/test/src/jdk/nashorn/internal/performance/PerformanceWrapper.java
@@ -31,9 +31,9 @@
 import java.util.concurrent.Future;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
+import jdk.nashorn.internal.objects.Global;
 import jdk.nashorn.internal.runtime.Context;
 import jdk.nashorn.internal.runtime.ScriptFunction;
-import jdk.nashorn.internal.runtime.ScriptObject;
 import jdk.nashorn.internal.runtime.ScriptRuntime;
 
 /**
@@ -89,7 +89,7 @@
     @Override
     protected Object apply(final ScriptFunction target, final Object self) {
         if (_runsPerIteration == 0 && _numberOfIterations == 0) {
-            final ScriptObject global = jdk.nashorn.internal.runtime.Context.getGlobal();
+            final Global global = jdk.nashorn.internal.runtime.Context.getGlobal();
             final ScriptFunction _target = target;
             final Object _self = self;
 
diff --git a/nashorn/test/src/jdk/nashorn/internal/runtime/ContextTest.java b/nashorn/test/src/jdk/nashorn/internal/runtime/ContextTest.java
index 1b21c23..1ec4169 100644
--- a/nashorn/test/src/jdk/nashorn/internal/runtime/ContextTest.java
+++ b/nashorn/test/src/jdk/nashorn/internal/runtime/ContextTest.java
@@ -29,6 +29,7 @@
 import static org.testng.Assert.assertTrue;
 
 import java.util.Map;
+import jdk.nashorn.internal.objects.Global;
 import jdk.nashorn.internal.runtime.options.Options;
 import org.testng.annotations.Test;
 
@@ -45,7 +46,7 @@
         final Options options = new Options("");
         final ErrorManager errors = new ErrorManager();
         final Context cx = new Context(options, errors, Thread.currentThread().getContextClassLoader());
-        final ScriptObject oldGlobal = Context.getGlobal();
+        final Global oldGlobal = Context.getGlobal();
         Context.setGlobal(cx.createGlobal());
         try {
             String code = "22 + 10";
@@ -65,7 +66,7 @@
         final ErrorManager errors = new ErrorManager();
         final Context cx = new Context(options, errors, Thread.currentThread().getContextClassLoader());
         final boolean strict = cx.getEnv()._strict;
-        final ScriptObject oldGlobal = Context.getGlobal();
+        final Global oldGlobal = Context.getGlobal();
         Context.setGlobal(cx.createGlobal());
 
         try {
diff --git a/nashorn/test/src/jdk/nashorn/internal/runtime/NoPersistenceCachingTest.java b/nashorn/test/src/jdk/nashorn/internal/runtime/NoPersistenceCachingTest.java
new file mode 100644
index 0000000..aefa828
--- /dev/null
+++ b/nashorn/test/src/jdk/nashorn/internal/runtime/NoPersistenceCachingTest.java
@@ -0,0 +1,133 @@
+/*
+ * 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 jdk.nashorn.internal.runtime;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import static org.testng.Assert.fail;
+import org.testng.annotations.Test;
+
+import javax.script.ScriptContext;
+import javax.script.ScriptEngine;
+import javax.script.ScriptEngineFactory;
+import javax.script.ScriptEngineManager;
+import javax.script.SimpleScriptContext;
+import jdk.nashorn.api.scripting.NashornScriptEngineFactory;
+
+/**
+ * @test
+ * @bug 8037378
+ * @summary Sanity tests for no persistence caching
+ * @run testng/othervm jdk.nashorn.internal.runtime.NoPersistenceCachingTest
+ */
+public class NoPersistenceCachingTest {
+
+   private ScriptEngine engine;
+   private ScriptContext context1, context2, context3;
+   private ByteArrayOutputStream stderr;
+   private PrintStream prevStderr;
+   private final String script = "print('Hello')";
+
+   public void setupTest() {
+      stderr = new ByteArrayOutputStream();
+      prevStderr = System.err;
+      System.setErr(new PrintStream(stderr));
+      NashornScriptEngineFactory nashornFactory = null;
+      ScriptEngineManager sm = new ScriptEngineManager();
+      for (ScriptEngineFactory fac : sm.getEngineFactories()) {
+         if (fac instanceof NashornScriptEngineFactory) {
+            nashornFactory = (NashornScriptEngineFactory) fac;
+            break;
+         }
+      }
+      if (nashornFactory == null) {
+         fail("Cannot find nashorn factory!");
+      }
+      String[] options = new String[]{"--log=compiler:finest"};
+      engine = nashornFactory.getScriptEngine(options);
+   }
+
+   public void setErrTest() {
+      System.setErr(prevStderr);
+   }
+
+   public void runTest(int numberOfContext, String expectedOutputPattern,
+                       int expectedPatternOccurrence) {
+      setupTest();
+      try {
+         switch (numberOfContext) {
+         case 2:
+            context1 = engine.getContext();
+            context2 = new SimpleScriptContext();
+            context2.setBindings(engine.createBindings(), ScriptContext.ENGINE_SCOPE);
+            engine.eval(script, context1);
+            engine.eval(script, context2);
+            break;
+         case 3:
+            context1 = engine.getContext();
+            context2 = new SimpleScriptContext();
+            context2.setBindings(engine.createBindings(), ScriptContext.ENGINE_SCOPE);
+            context3 = new SimpleScriptContext();
+            context3.setBindings(engine.createBindings(), ScriptContext.ENGINE_SCOPE);
+            engine.eval(script, context1);
+            engine.eval(script, context2);
+            engine.eval(script, context3);
+            break;
+         }
+      } catch (final Exception se) {
+         se.printStackTrace();
+         fail(se.getMessage());
+      }
+      Pattern deoptimizing = Pattern.compile(expectedOutputPattern);
+      Matcher matcher = deoptimizing.matcher(stderr.toString());
+      int matches = 0;
+      while (matcher.find()) {
+         matches++;
+      }
+      if (matches != expectedPatternOccurrence) {
+         fail("Number of cache hit is not correct, expected: "
+                    + expectedPatternOccurrence + " and found: " + matches + "\n"
+              + stderr);
+      }
+      setErrTest();
+   }
+
+   private static String getCodeCachePattern() {
+      return ("\\[compiler\\]\\sCode\\scache\\shit\\sfor\\s<eval>\\savoiding\\srecompile.");
+   }
+
+    @Test
+    public void twoContextTest() {
+       runTest(2, getCodeCachePattern(), 1);
+
+    }
+
+    @Test
+    public void threeContextTest() {
+       runTest(3, getCodeCachePattern(), 2);
+    }
+}
diff --git a/nashorn/test/src/jdk/nashorn/internal/test/framework/SharedContextEvaluator.java b/nashorn/test/src/jdk/nashorn/internal/test/framework/SharedContextEvaluator.java
index ac2dc17..83d057f 100644
--- a/nashorn/test/src/jdk/nashorn/internal/test/framework/SharedContextEvaluator.java
+++ b/nashorn/test/src/jdk/nashorn/internal/test/framework/SharedContextEvaluator.java
@@ -34,10 +34,10 @@
 import java.io.OutputStream;
 import java.io.PrintWriter;
 import jdk.nashorn.api.scripting.NashornException;
+import jdk.nashorn.internal.objects.Global;
 import jdk.nashorn.internal.runtime.Context;
 import jdk.nashorn.internal.runtime.ErrorManager;
 import jdk.nashorn.internal.runtime.ScriptFunction;
-import jdk.nashorn.internal.runtime.ScriptObject;
 import jdk.nashorn.internal.runtime.ScriptRuntime;
 import jdk.nashorn.internal.runtime.Source;
 import jdk.nashorn.internal.runtime.options.Options;
@@ -110,12 +110,12 @@
 
     @Override
     public int run(final OutputStream out, final OutputStream err, final String[] args) throws IOException {
-        final ScriptObject oldGlobal = Context.getGlobal();
+        final Global oldGlobal = Context.getGlobal();
         try {
             ctxOut.setDelegatee(out);
             ctxErr.setDelegatee(err);
             final ErrorManager errors = context.getErrorManager();
-            final ScriptObject global = context.createGlobal();
+            final Global global = context.createGlobal();
             Context.setGlobal(global);
 
             // For each file on the command line.