Reland of Add web compat workarounds for ES2015 RegExp semantics (patchset #3 id:40001 of https://c…

src/js/harmony-regexp.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.
 
 (function(global, utils) {
 
 'use strict';
 
 %CheckIsBootstrapping();
 
 // -------------------------------------------------------------------
 // Imports
 
 var GlobalRegExp = global.RegExp;
+var GlobalRegExpPrototype = GlobalRegExp.prototype;
 var MakeTypeError;
 var regExpFlagsSymbol = utils.ImportNow("regexp_flags_symbol");
 
 utils.Import(function(from) {
   MakeTypeError = from.MakeTypeError;
 });
 
 // -------------------------------------------------------------------
 
 // ES6 draft 12-06-13, section 21.2.5.3
 // + https://bugs.ecmascript.org/show_bug.cgi?id=3423
 function RegExpGetFlags() {
   if (!IS_RECEIVER(this)) {
     throw MakeTypeError(
         kRegExpNonObject, "RegExp.prototype.flags", TO_STRING(this));
   }
   var result = '';
   if (this.global) result += 'g';
   if (this.ignoreCase) result += 'i';
   if (this.multiline) result += 'm';
   if (this.unicode) result += 'u';
   if (this.sticky) result += 'y';
   return result;
 }
 
+const kRegExpPrototypeStickyGetter = 11;
 
 // ES6 21.2.5.12.
 function RegExpGetSticky() {
   if (!IS_REGEXP(this)) {
+    // Compat fix: RegExp.prototype.sticky == undefined; UseCounter tracks it
+    // TODO(littledan): Remove this workaround or standardize it
+    if (this === GlobalRegExpPrototype) {
+      %IncrementUseCounter(kRegExpPrototypeStickyGetter);
+      return UNDEFINED;
+    }
     throw MakeTypeError(kRegExpNonRegExp, "RegExp.prototype.sticky");
   }
   return !!REGEXP_STICKY(this);
 }
 %FunctionSetName(RegExpGetSticky, "RegExp.prototype.sticky");
 %SetNativeFlag(RegExpGetSticky);
 
 
 // ES6 21.2.5.15.
 function RegExpGetUnicode() {
   if (!IS_REGEXP(this)) {
     throw MakeTypeError(kRegExpNonRegExp, "RegExp.prototype.unicode");
   }
   return !!REGEXP_UNICODE(this);
 }
 %FunctionSetName(RegExpGetUnicode, "RegExp.prototype.unicode");
 %SetNativeFlag(RegExpGetUnicode);
 
 utils.InstallGetter(GlobalRegExp.prototype, 'flags', RegExpGetFlags);
 utils.InstallGetter(GlobalRegExp.prototype, 'sticky', RegExpGetSticky);
 utils.InstallGetter(GlobalRegExp.prototype, 'unicode', RegExpGetUnicode);
 
 })