Add remaining @@toStringTag symbols to builtins

R=dslomov@chromium.org

Review URL: https://codereview.chromium.org/664333003

Patch from Caitlin Potter <caitpotter88@gmail.com>.

Cr-Commit-Position: refs/heads/master@{#24885}
git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24885 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/array-iterator.js

@@ -112,6 +112,8 @@ function SetUpArrayIterator() {
   %FunctionSetName(ArrayIteratorIterator, '[Symbol.iterator]');
   %AddNamedProperty(ArrayIterator.prototype, symbolIterator,
                     ArrayIteratorIterator, DONT_ENUM);
+  %AddNamedProperty(ArrayIterator.prototype, symbolToStringTag,
+                    "Array Iterator", READ_ONLY | DONT_ENUM);
 }
 SetUpArrayIterator();
 

src/collection-iterator.js

@@ -77,6 +77,8 @@ function SetUpSetIterator() {
   %FunctionSetName(SetIteratorSymbolIterator, '[Symbol.iterator]');
   %AddNamedProperty(SetIterator.prototype, symbolIterator,
       SetIteratorSymbolIterator, DONT_ENUM);
+  %AddNamedProperty(SetIterator.prototype, symbolToStringTag,
+      "Set Iterator", READ_ONLY | DONT_ENUM);
 }
 
 SetUpSetIterator();
@@ -174,6 +176,8 @@ function SetUpMapIterator() {
   %FunctionSetName(MapIteratorSymbolIterator, '[Symbol.iterator]');
   %AddNamedProperty(MapIterator.prototype, symbolIterator,
       MapIteratorSymbolIterator, DONT_ENUM);
+  %AddNamedProperty(MapIterator.prototype, symbolToStringTag,
+      "Map Iterator", READ_ONLY | DONT_ENUM);
 }
 
 SetUpMapIterator();

src/heap-snapshot-generator.cc

@@ -1711,11 +1711,11 @@ bool V8HeapExplorer::ExtractAccessorPairProperty(
   AccessorPair* accessors = AccessorPair::cast(callback_obj);
   Object* getter = accessors->getter();
   if (!getter->IsOddball()) {
-    SetPropertyReference(js_obj, entry, String::cast(key), getter, "get %s");
+    SetPropertyReference(js_obj, entry, Name::cast(key), getter, "get %s");
   }
   Object* setter = accessors->setter();
   if (!setter->IsOddball()) {
-    SetPropertyReference(js_obj, entry, String::cast(key), setter, "set %s");
+    SetPropertyReference(js_obj, entry, Name::cast(key), setter, "set %s");
   }
   return true;
 }

src/json.js

@@ -220,6 +220,8 @@ function JSONStringify(value, replacer, space) {
 function SetUpJSON() {
   %CheckIsBootstrapping();
 
+  %AddNamedProperty($JSON, symbolToStringTag, "JSON", READ_ONLY | DONT_ENUM);
+
   // Set up non-enumerable properties of the JSON object.
   InstallFunctions($JSON, DONT_ENUM, $Array(
     "parse", JSONParse,

src/math.js

@@ -321,6 +321,8 @@ function SetUpMath() {
   %AddNamedProperty(global, "Math", $Math, DONT_ENUM);
   %FunctionSetInstanceClassName(MathConstructor, 'Math');
 
+  %AddNamedProperty($Math, symbolToStringTag, "Math", READ_ONLY | DONT_ENUM);
+
   // Set up math constants.
   InstallConstants($Math, $Array(
     // ECMA-262, section 15.8.1.1.

src/runtime/runtime-function.cc

@@ -67,13 +67,32 @@ RUNTIME_FUNCTION(Runtime_FunctionGetName) {
 }
 
 
+static Handle<String> NameToFunctionName(Handle<Name> name) {
+  Handle<String> stringName(name->GetHeap()->empty_string());
+
+  // TODO(caitp): Follow proper rules in section 9.2.11 (SetFunctionName)
+  if (name->IsSymbol()) {
+    Handle<Object> description(Handle<Symbol>::cast(name)->name(),
+                               name->GetIsolate());
+    if (description->IsString()) {
+      stringName = Handle<String>::cast(description);
+    }
+  } else {
+    stringName = Handle<String>::cast(name);
+  }
+
+  return stringName;
+}
+
+
 RUNTIME_FUNCTION(Runtime_FunctionSetName) {
-  SealHandleScope shs(isolate);
+  HandleScope scope(isolate);
   DCHECK(args.length() == 2);
 
-  CONVERT_ARG_CHECKED(JSFunction, f, 0);
-  CONVERT_ARG_CHECKED(String, name, 1);
-  f->shared()->set_name(name);
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, f, 0);
+  CONVERT_ARG_HANDLE_CHECKED(Name, name, 1);
+
+  f->shared()->set_name(*NameToFunctionName(name));
   return isolate->heap()->undefined_value();
 }
 

src/string-iterator.js

@@ -87,6 +87,8 @@ function SetUpStringIterator() {
   %FunctionSetName(StringIteratorIterator, '[Symbol.iterator]');
   %AddNamedProperty(StringIterator.prototype, symbolIterator,
                     StringIteratorIterator, DONT_ENUM);
+  %AddNamedProperty(StringIterator.prototype, symbolToStringTag,
+                    "String Iterator", READ_ONLY | DONT_ENUM);
 }
 SetUpStringIterator();
 

src/typedarray.js

@@ -291,6 +291,13 @@ function TypedArraySet(obj, offset) {
   }
 }
 
+function TypedArrayGetToStringTag() {
+  if (!%IsTypedArray(this)) return;
+  var name = %_ClassOf(this);
+  if (IS_UNDEFINED(name)) return;
+  return name;
+}
+
 // -------------------------------------------------------------------
 
 function SetupTypedArrays() {
@@ -310,7 +317,8 @@ macro SETUP_TYPED_ARRAY(ARRAY_ID, NAME, ELEMENT_SIZE)
   InstallGetter(global.NAME.prototype, "byteOffset", NAME_GetByteOffset);
   InstallGetter(global.NAME.prototype, "byteLength", NAME_GetByteLength);
   InstallGetter(global.NAME.prototype, "length", NAME_GetLength);
-
+  InstallGetter(global.NAME.prototype, symbolToStringTag,
+                TypedArrayGetToStringTag);
   InstallFunctions(global.NAME.prototype, DONT_ENUM, $Array(
         "subarray", NAMESubArray,
         "set", TypedArraySet
@@ -437,6 +445,8 @@ function SetupDataView() {
 
   // Set up constructor property on the DataView prototype.
   %AddNamedProperty($DataView.prototype, "constructor", $DataView, DONT_ENUM);
+  %AddNamedProperty(
+      $DataView.prototype, symbolToStringTag, "DataView", READ_ONLY|DONT_ENUM);
 
   InstallGetter($DataView.prototype, "buffer", DataViewGetBufferJS);
   InstallGetter($DataView.prototype, "byteOffset", DataViewGetByteOffset);

test/mjsunit/es6/array-iterator.js

@@ -25,7 +25,7 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --allow-natives-syntax
+// Flags: --allow-natives-syntax --harmony-tostring
 
 
 var NONE = 0;
@@ -158,6 +158,15 @@ function TestArrayIteratorPrototype() {
       Object.getOwnPropertyNames(ArrayIteratorPrototype));
   assertHasOwnProperty(ArrayIteratorPrototype, 'next', DONT_ENUM);
   assertHasOwnProperty(ArrayIteratorPrototype, Symbol.iterator, DONT_ENUM);
+
+  assertEquals("[object Array Iterator]",
+      Object.prototype.toString.call(iterator));
+  assertEquals("Array Iterator", ArrayIteratorPrototype[Symbol.toStringTag]);
+  var desc = Object.getOwnPropertyDescriptor(
+      ArrayIteratorPrototype, Symbol.toStringTag);
+  assertTrue(desc.configurable);
+  assertFalse(desc.writable);
+  assertEquals("Array Iterator", desc.value);
 }
 TestArrayIteratorPrototype();
 

test/mjsunit/es6/collection-iterator.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --allow-natives-syntax
+// Flags: --allow-natives-syntax --harmony-tostring
 
 
 (function TestSetIterator() {
@@ -19,6 +19,15 @@
 
   assertEquals(new Set().values().__proto__, SetIteratorPrototype);
   assertEquals(new Set().entries().__proto__, SetIteratorPrototype);
+
+  assertEquals("[object Set Iterator]",
+      Object.prototype.toString.call(iter));
+  assertEquals("Set Iterator", SetIteratorPrototype[Symbol.toStringTag]);
+  var desc = Object.getOwnPropertyDescriptor(
+      SetIteratorPrototype, Symbol.toStringTag);
+  assertTrue(desc.configurable);
+  assertFalse(desc.writable);
+  assertEquals("Set Iterator", desc.value);
 })();
 
 
@@ -120,6 +129,15 @@
   assertEquals(new Map().values().__proto__, MapIteratorPrototype);
   assertEquals(new Map().keys().__proto__, MapIteratorPrototype);
   assertEquals(new Map().entries().__proto__, MapIteratorPrototype);
+
+  assertEquals("[object Map Iterator]",
+      Object.prototype.toString.call(iter));
+  assertEquals("Map Iterator", MapIteratorPrototype[Symbol.toStringTag]);
+  var desc = Object.getOwnPropertyDescriptor(
+      MapIteratorPrototype, Symbol.toStringTag);
+  assertTrue(desc.configurable);
+  assertFalse(desc.writable);
+  assertEquals("Map Iterator", desc.value);
 })();
 
 

test/mjsunit/es6/json.js

+// Copyright 2014 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: --harmony-tostring
+
+function testJSONToString() {
+  assertEquals('[object JSON]', "" + JSON);
+  assertEquals("JSON", JSON[Symbol.toStringTag]);
+  var desc = Object.getOwnPropertyDescriptor(JSON, Symbol.toStringTag);
+  assertTrue(desc.configurable);
+  assertFalse(desc.writable);
+  assertEquals("JSON", desc.value);
+}
+testJSONToString();

test/mjsunit/es6/math.js

+// Copyright 2014 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: --harmony-tostring
+
+function testMathToString() {
+  assertEquals('[object Math]', "" + Math);
+  assertEquals("Math", Math[Symbol.toStringTag]);
+  var desc = Object.getOwnPropertyDescriptor(Math, Symbol.toStringTag);
+  assertTrue(desc.configurable);
+  assertFalse(desc.writable);
+  assertEquals("Math", desc.value);
+}
+testMathToString();

test/mjsunit/es6/string-iterator.js

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// Flags: --harmony-tostring
 
 function TestStringPrototypeIterator() {
   assertTrue(String.prototype.hasOwnProperty(Symbol.iterator));
@@ -59,6 +60,12 @@ function TestStringIteratorPrototype() {
   assertArrayEquals(['next'],
       Object.getOwnPropertyNames(StringIteratorPrototype));
   assertEquals('[object String Iterator]', "" + iterator);
+  assertEquals("String Iterator", StringIteratorPrototype[Symbol.toStringTag]);
+  var desc = Object.getOwnPropertyDescriptor(
+      StringIteratorPrototype, Symbol.toStringTag);
+  assertTrue(desc.configurable);
+  assertFalse(desc.writable);
+  assertEquals("String Iterator", desc.value);
 }
 TestStringIteratorPrototype();
 

test/mjsunit/harmony/typedarrays.js

@@ -265,6 +265,17 @@ function TestTypedArray(constr, elementSize, typicalElement) {
   assertSame(0, aNoParam.length);
   assertSame(0, aNoParam.byteLength);
   assertSame(0, aNoParam.byteOffset);
+
+  var a = new constr(ab, 64*elementSize, 128);
+  assertEquals("[object " + constr.name + "]",
+      Object.prototype.toString.call(a));
+  var desc = Object.getOwnPropertyDescriptor(
+      constr.prototype, Symbol.toStringTag);
+  assertTrue(desc.configurable);
+  assertFalse(desc.enumerable);
+  assertFalse(!!desc.writable);
+  assertFalse(!!desc.set);
+  assertEquals("function", typeof desc.get);
 }
 
 TestTypedArray(Uint8Array, 1, 0xFF);
@@ -654,6 +665,19 @@ function TestDataViewPropertyTypeChecks() {
 
 TestDataViewPropertyTypeChecks();
 
+
+function TestDataViewToStringTag() {
+  var a = new DataView(new ArrayBuffer(10));
+  assertEquals("[object DataView]", Object.prototype.toString.call(a));
+  var desc = Object.getOwnPropertyDescriptor(
+      DataView.prototype, Symbol.toStringTag);
+  assertTrue(desc.configurable);
+  assertFalse(desc.enumerable);
+  assertFalse(desc.writable);
+  assertEquals("DataView", desc.value);
+}
+
+
 // General tests for properties
 
 // Test property attribute [[Enumerable]]