[es6] don't throw if argument is non-object (O.freeze, O.seal, O.preventExtensions)

test/mjsunit/object-freeze.js

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-// Tests the Object.freeze and Object.isFrozen methods - ES 15.2.3.9 and
-// ES 15.2.3.12
+// Tests the Object.freeze and Object.isFrozen methods - ES 19.1.2.5 and
+// ES 19.1.2.12
 
 // Flags: --allow-natives-syntax
 
-// Test that we throw an error if an object is not passed as argument.
-var non_objects = new Array(undefined, null, 1, -1, 0, 42.43);
+// Test that we return obj if non-object is passed as argument
+var non_objects = new Array(undefined, null, 1, -1, 0, 42.43, Symbol("test"));
 for (var key in non_objects) {
-  var exception = false;
-  try {
-    Object.freeze(non_objects[key]);
-  } catch(e) {
-    exception = true;
-    assertTrue(/Object.freeze called on non-object/.test(e));
-  }
-  assertTrue(exception);
+  assertSame(non_objects[key], Object.freeze(non_objects[key]));
 }
 
+// Test that isFrozen always returns true for non-objects
 for (var key in non_objects) {
-  exception = false;
-  try {
-    Object.isFrozen(non_objects[key]);
-  } catch(e) {
-    exception = true;
-    assertTrue(/Object.isFrozen called on non-object/.test(e));
-  }
-  assertTrue(exception);
+  assertTrue(Object.isFrozen(non_objects[key]));
 }
 
 // Test normal data properties.
 var obj = { x: 42, z: 'foobar' };
 var desc = Object.getOwnPropertyDescriptor(obj, 'x');
 assertTrue(desc.writable);
 assertTrue(desc.configurable);
 assertEquals(42, desc.value);
 
 desc = Object.getOwnPropertyDescriptor(obj, 'z');
@@ skipping 276 matching lines @@
 assertThrows(function() { obj.unshift(); }, TypeError);
 
 // Sealing and then Freezing should do the right thing.
 var obj = { foo: 'bar', 0: 'element' };
 Object.seal(obj);
 assertTrue(Object.isSealed(obj));
 assertFalse(Object.isFrozen(obj));
 Object.freeze(obj);
 assertTrue(Object.isSealed(obj));
 assertTrue(Object.isFrozen(obj));
+
+
+(function propertiesOfFrozenObjectNotFrozen() {
+  function Frozen() {}
+  Object.freeze(Frozen);
+  assertDoesNotThrow(function() { return new Frozen(); });
+  Frozen.prototype.prototypeExists = true;
+  assertTrue((new Frozen()).prototypeExists);
+})();
+
+
+(function frozenPrototypePreventsPUT() {
+  // A read-only property on the prototype should prevent a [[Put]] .
+  function Constructor() {}
+  Constructor.prototype.foo = 1;
+  Object.freeze(Constructor.prototype);
+  var obj = new Constructor();
+  obj.foo = 2;
+  assertSame(1, obj.foo);
+})();
+
+
+(function frozenFunctionSloppy() {
+  // Check that freezing a function works correctly.
+  var func = Object.freeze(function foo(){});
+  assertTrue(Object.isFrozen(func));
+  func.prototype = 42;
+  assertFalse(func.prototype === 42);
+  assertFalse(Object.getOwnPropertyDescriptor(func, "prototype").writable);
+})();
+
+
+(function frozenFunctionStrict() {
+  // Check that freezing a strict function works correctly.
+  var func = Object.freeze(function foo(){ "use strict"; });
+  assertTrue(Object.isFrozen(func));
+  func.prototype = 42;
+  assertFalse(func.prototype === 42);
+  assertFalse(Object.getOwnPropertyDescriptor(func, "prototype").writable);
+})();
+
+
+(function frozenArrayObject() {
+  // Check that freezing array objects works correctly.
+  var array = Object.freeze([0,1,2]);
+  assertTrue(Object.isFrozen(array));
+  array[0] = 3;
+  assertEquals(0, array[0]);
+  assertFalse(Object.getOwnPropertyDescriptor(array, "length").writable);
+})();
+
+
+(function frozenArgumentsObject() {
+  // Check that freezing arguments objects works correctly.
+  var args = Object.freeze((function(){ return arguments; })(0,1,2));
+  assertTrue(Object.isFrozen(args));
+  args[0] = 3;
+  assertEquals(0, args[0]);
+  assertFalse(Object.getOwnPropertyDescriptor(args, "length").writable);
+  assertFalse(Object.getOwnPropertyDescriptor(args, "callee").writable);
+})();