[strong] Implement per-object restrictions behaviour of property freezing

test/mjsunit/strong/object-freeze-property.js

+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --strong-mode --allow-natives-syntax
+
+// TODO(conradw): Track implementation of strong bit for other objects, add
+// tests.
+
+function getSloppyObjects() {
+  return [(function(){}), ({})];
+}
+
+function getStrictObjects() {
+  "use strict";
+  return [(function(){}), ({})];
+}
+
+function getStrongObjects() {
+  "use strong";
+  // Strong functions can't have properties added to them.
+  return [{}];
+}
+
+(function testStrongObjectFreezePropValid() {
+  "use strict";
+  let strongObjects = getStrongObjects();
+
+  for (let o of strongObjects) {
+    Object.defineProperty(o, "foo", { configurable: true, writable: true });
+    assertDoesNotThrow(
+      function() {
+        "use strong";
+        Object.defineProperty(o, "foo", {configurable: true, writable: false });
+      });
+  }
+})();
+
+(function testStrongObjectFreezePropInvalid() {
+  "use strict";
+  let sloppyObjects = getSloppyObjects();
+  let strictObjects = getStrictObjects();
+  let strongObjects = getStrongObjects();
+  let weakObjects = sloppyObjects.concat(strictObjects);
+
+  for (let o of weakObjects) {
+    Object.defineProperty(o, "foo", { writable: true });
+    assertDoesNotThrow(
+      function() {
+        "use strong";
+        Object.defineProperty(o, "foo", { writable: false });
+      });
+  }
+  for (let o of strongObjects) {
+    function defProp(o) {
+      Object.defineProperty(o, "foo", { writable: false });
+    }
+    function defProps(o) {
+      Object.defineProperties(o, { "foo": { writable: false } });
+    }
+    function freezeProp(o) {
+      Object.freeze(o);
+    }
+    Object.defineProperty(o, "foo", { writable: true });
+    for (let func of [defProp, defProps, freezeProp]) {
+      assertThrows(function(){func(o)}, TypeError);
+      assertThrows(function(){func(o)}, TypeError);
+      assertThrows(function(){func(o)}, TypeError);
+      %OptimizeFunctionOnNextCall(func);
+      assertThrows(function(){func(o)}, TypeError);
+      %DeoptimizeFunction(func);
+      assertThrows(function(){func(o)}, TypeError);
+    }
+  }
+})();