Move prototype metadata from internal properties to prototype maps

src/bootstrapper.cc

 // 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.
 
 #include "src/bootstrapper.h"
 
 #include "src/accessors.h"
 #include "src/api-natives.h"
 #include "src/code-stubs.h"
 #include "src/extensions/externalize-string-extension.h"
@@ skipping 815 matching lines @@
     DCHECK_EQ(*isolate()->object_function(), *value);
 #endif
   } else {
     Handle<FunctionTemplateInfo> js_global_object_constructor(
         FunctionTemplateInfo::cast(js_global_object_template->constructor()));
     js_global_object_function = ApiNatives::CreateApiFunction(
         isolate(), js_global_object_constructor, factory()->the_hole_value(),
         ApiNatives::GlobalObjectType);
   }
 
+  js_global_object_function->initial_map()->set_is_prototype_map(true);

[Jakob Kummerow, 2015/03/24 10:40:13]

This makes it possible to DCHECK that we only ever install PrototypeInfo structs
on prototype maps.

   js_global_object_function->initial_map()->set_is_hidden_prototype();
   js_global_object_function->initial_map()->set_dictionary_map(true);
   Handle<GlobalObject> global_object =
       factory()->NewGlobalObject(js_global_object_function);
 
   // Step 2: (re)initialize the global proxy object.
   Handle<JSFunction> global_proxy_function;
   if (global_proxy_template.IsEmpty()) {
     Handle<String> name = Handle<String>(heap()->empty_string());
     Handle<Code> code = Handle<Code>(isolate()->builtins()->builtin(
@@ skipping 2073 matching lines @@
   return from + sizeof(NestingCounterType);
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 } }  // namespace v8::internal