Expose a way to make a "same-origin" realm

src/d8.cc

 // Copyright 2012 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.
 
 
 // Defined when linking against shared lib on Windows.
 #if defined(USING_V8_SHARED) && !defined(V8_SHARED)
 #define V8_SHARED
 #endif
 
@@ skipping 530 matching lines @@
   Local<Context> context = Context::New(isolate, NULL, global_template);
   if (context.IsEmpty()) {
     DCHECK(try_catch.HasCaught());
     try_catch.ReThrow();
     return;
   }
   data->realms_[index].Reset(isolate, context);
   args.GetReturnValue().Set(index);
 }
 
+// Realm.createAllowCrossRealmAccess(i) jreates a new realm with the same

[adamk, 2016/05/19 19:23:20]

s/jreates/creates/

[Dan Ehrenberg, 2016/05/27 13:51:39]

Done

+// security token as the current realm.
+void Shell::RealmCreateAllowCrossRealmAccess(

[rossberg, 2016/05/19 06:07:00]

I wouldn't mind factoring out the commonalities between this and and the
previous method.

[adamk, 2016/05/19 19:23:20]

Agreed, the fewer places we have to write 'delete[]' the better :)

[Dan Ehrenberg, 2016/05/27 13:51:39]

Done

+    const v8::FunctionCallbackInfo<v8::Value>& args) {
+  Isolate* isolate = args.GetIsolate();
+  TryCatch try_catch(isolate);
+  PerIsolateData* data = PerIsolateData::Get(isolate);
+  Global<Context>* old_realms = data->realms_;
+  int index = data->realm_count_;
+  data->realms_ = new Global<Context>[++data->realm_count_];
+  for (int i = 0; i < index; ++i) {
+    data->realms_[i].Reset(isolate, old_realms[i]);
+    old_realms[i].Reset();
+  }
+  delete[] old_realms;
+  Local<ObjectTemplate> global_template = CreateGlobalTemplate(isolate);
+  Local<Context> context = Context::New(isolate, NULL, global_template);
+  if (context.IsEmpty()) {
+    DCHECK(try_catch.HasCaught());
+    try_catch.ReThrow();
+    return;
+  }
+  context->SetSecurityToken(isolate->GetEnteredContext()->GetSecurityToken());
+  data->realms_[index].Reset(isolate, context);
+  args.GetReturnValue().Set(index);
+}
 
 // Realm.dispose(i) disposes the reference to the realm i.
 void Shell::RealmDispose(const v8::FunctionCallbackInfo<v8::Value>& args) {
   Isolate* isolate = args.GetIsolate();
   PerIsolateData* data = PerIsolateData::Get(isolate);
   int index = data->RealmIndexOrThrow(args, 0);
   if (index == -1) return;
   if (index == 0 ||
       index == data->realm_current_ || index == data->realm_switch_) {
     Throw(args.GetIsolate(), "Invalid realm index");
@@ skipping 568 matching lines @@
       FunctionTemplate::New(isolate, RealmOwner));
   realm_template->Set(
       String::NewFromUtf8(isolate, "global", NewStringType::kNormal)
           .ToLocalChecked(),
       FunctionTemplate::New(isolate, RealmGlobal));
   realm_template->Set(
       String::NewFromUtf8(isolate, "create", NewStringType::kNormal)
           .ToLocalChecked(),
       FunctionTemplate::New(isolate, RealmCreate));
   realm_template->Set(
+      String::NewFromUtf8(isolate, "createAllowCrossRealmAccess",
+                          NewStringType::kNormal)
+          .ToLocalChecked(),
+      FunctionTemplate::New(isolate, RealmCreateAllowCrossRealmAccess));
+  realm_template->Set(
       String::NewFromUtf8(isolate, "dispose", NewStringType::kNormal)
           .ToLocalChecked(),
       FunctionTemplate::New(isolate, RealmDispose));
   realm_template->Set(
       String::NewFromUtf8(isolate, "switch", NewStringType::kNormal)
           .ToLocalChecked(),
       FunctionTemplate::New(isolate, RealmSwitch));
   realm_template->Set(
       String::NewFromUtf8(isolate, "eval", NewStringType::kNormal)
           .ToLocalChecked(),
@@ skipping 1377 matching lines @@
 }
 
 }  // namespace v8
 
 
 #ifndef GOOGLE3
 int main(int argc, char* argv[]) {
   return v8::Shell::Main(argc, argv);
 }
 #endif