8042364: Make __proto__ ES6 draft compliant

Reviewed-by: jlaskey, lagergren, attila

nashorn/src/jdk/nashorn/internal/codegen/CodeGenerator.java

@@ -1451,7 +1451,10 @@ final class CodeGenerator extends NodeOperatorVisitor<CodeGeneratorLexicalContex
 
             if (value == null) {
                 hasGettersSetters = true;
-            } else if (key.equals(ScriptObject.PROTO_PROPERTY_NAME)) {
+            } else if (propertyNode.getKey() instanceof IdentNode &&
+                       key.equals(ScriptObject.PROTO_PROPERTY_NAME)) {
+                // ES6 draft compliant __proto__ inside object literal
+                // Identifier key and name is __proto__
                 protoNode = value;
                 continue;
             }

nashorn/src/jdk/nashorn/internal/objects/Global.java

@@ -1906,6 +1906,13 @@ public final class Global extends ScriptObject implements Scope {
         // Object.getPrototypeOf(Function.prototype) === Object.prototype
         anon.setInitialProto(ObjectPrototype);
 
+        // ES6 draft compliant __proto__ property of Object.prototype
+        // accessors on Object.prototype for "__proto__"
+        final ScriptFunction getProto = ScriptFunctionImpl.makeFunction("getProto", ScriptObject.GETPROTO);
+        final ScriptFunction setProto = ScriptFunctionImpl.makeFunction("setProto", ScriptObject.SETPROTOCHECK);
+        ObjectPrototype.addOwnProperty("__proto__", Attribute.NOT_ENUMERABLE, getProto, setProto);
+
+
         // Function valued properties of Function.prototype were not properly
         // initialized. Because, these were created before global.function and
         // global.object were not initialized.

nashorn/src/jdk/nashorn/internal/runtime/ScriptObject.java

@@ -91,7 +91,7 @@ import jdk.nashorn.internal.runtime.linker.NashornGuards;
  */
 
 public abstract class ScriptObject implements PropertyAccess {
-    /** __proto__ special property name */
+    /** __proto__ special property name inside object literals. ES6 draft. */
     public static final String PROTO_PROPERTY_NAME   = "__proto__";
 
     /** Search fall back routine name for "no such method" */
@@ -130,8 +130,10 @@ public abstract class ScriptObject implements PropertyAccess {
     /** Indexed array data. */
     private ArrayData arrayData;
 
-    static final MethodHandle GETPROTO           = findOwnMH("getProto", ScriptObject.class);
-    static final MethodHandle SETPROTOCHECK      = findOwnMH("setProtoCheck", void.class, Object.class);
+    /** Method handle to retrive prototype of this object */
+    public static final MethodHandle GETPROTO           = findOwnMH("getProto", ScriptObject.class);
+    /** Method handle to set prototype of this object */
+    public static final MethodHandle SETPROTOCHECK      = findOwnMH("setProtoCheck", void.class, Object.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);
 
@@ -1732,10 +1734,6 @@ public abstract class ScriptObject implements PropertyAccess {
         MethodHandle methodHandle;
 
         if (find == null) {
-            if (PROTO_PROPERTY_NAME.equals(name)) {
-                return new GuardedInvocation(GETPROTO, NashornGuards.getScriptObjectGuard());
-            }
-
             if ("getProp".equals(operator)) {
                 return noSuchProperty(desc, request);
             } else if ("getMethod".equals(operator)) {
@@ -1890,9 +1888,7 @@ public abstract class ScriptObject implements PropertyAccess {
                 return createEmptySetMethod(desc, "property.not.writable", true);
             }
         } else {
-            if (PROTO_PROPERTY_NAME.equals(name)) {
-                return new GuardedInvocation(SETPROTOCHECK, NashornGuards.getScriptObjectGuard());
-            } else if (! isExtensible()) {
+            if (! isExtensible()) {
                 return createEmptySetMethod(desc, "object.non.extensible", false);
             }
         }

nashorn/test/script/basic/JDK-8024120.js

@@ -32,10 +32,6 @@ var obj = {};
 
 obj.__proto__ = null;
 
-if (obj.__proto__ !== null || typeof(obj.__proto__) != 'object') {
-    fail("obj.__proto__ is expected to be null");
-}
-
 var p = Object.getPrototypeOf(obj);
 if (p !== null || typeof(p) != 'object') {
     fail("Object.getPrototypeOf(obj) is expected to be null");

nashorn/test/script/basic/JDK-8024174.js

@@ -46,6 +46,6 @@ var obj2 = {
     __proto__: null
 };
 
-if (obj2.__proto__ !== null || Object.getPrototypeOf(obj2) !== null) {
+if (Object.getPrototypeOf(obj2) !== null) {
     fail("obj2.__proto__ was not set to null inside literal");
 }

nashorn/test/script/basic/JDK-8042364.js

@@ -0,0 +1,65 @@
+/*
+ * 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-8042364: Make __proto__ ES6 draft compliant
+ * 
+ * @test
+ * @run
+ */
+
+// check for Object.prototype.__proto__ accessor property
+print("Object.prototype has __proto__?",
+    Object.prototype.hasOwnProperty("__proto__"))
+
+var desc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__")
+print("descriptor");
+print(JSON.stringify(desc))
+print("getter", desc.get)
+print("setter", desc.set)
+
+// no computed "__proto__" name, only identifier!
+var p = {}
+var obj = {
+    "__proto__" : p
+}
+
+if (Object.getPrototypeOf(obj) === p) {
+    fail("obj has wrong __proto__, allows computed __proto__!")
+}
+
+if (obj.__proto__ !== p) {
+    fail("__proto__ not created as normal property!")
+}
+
+if (Object.getPrototypeOf(obj) !== Object.prototype) {
+    fail("obj has wrong __proto__")
+}
+
+var obj2 = {
+    __proto__: p
+}
+
+if (Object.getPrototypeOf(obj2) !== p) {
+    fail("can't set __proto__ in object literal")
+}

nashorn/test/script/basic/JDK-8042364.js.EXPECTED

@@ -0,0 +1,5 @@
+Object.prototype has __proto__? true
+descriptor
+{"configurable":true,"enumerable":false}
+getter function getProto() { [native code] }
+setter function setProto() { [native code] }