Implement ES6 symbol registry and predefined symbols

src/runtime.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 618 matching lines @@
 
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_SymbolDescription) {
   SealHandleScope shs(isolate);
   ASSERT(args.length() == 1);
   CONVERT_ARG_CHECKED(Symbol, symbol, 0);
   return symbol->name();
 }
 
 
+RUNTIME_FUNCTION(MaybeObject*, Runtime_SymbolRegistry) {
+  HandleScope scope(isolate);

[Michael Starzinger, 2014/03/19 10:15:25]

nit: Not that it makes much of a difference, but this can be within a
SealHandleScope here.

[rossberg, 2014/03/20 10:40:13]

Done.

+  ASSERT(args.length() == 0);
+  return isolate->heap()->symbol_registry();
+}
+
+
 RUNTIME_FUNCTION(MaybeObject*, Runtime_SymbolIsPrivate) {
   SealHandleScope shs(isolate);
   ASSERT(args.length() == 1);
   CONVERT_ARG_CHECKED(Symbol, symbol, 0);
   return isolate->heap()->ToBoolean(symbol->is_private());
 }
 
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_CreateJSProxy) {
   SealHandleScope shs(isolate);
@@ skipping 14370 matching lines @@
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     isolate->counters()->gc_last_resort_from_js()->Increment();
     isolate->heap()->CollectAllGarbage(Heap::kNoGCFlags,
                                        "Runtime::PerformGC");
   }
 }
 
 
 } }  // namespace v8::internal