Add Isolate.current getter, returning the current isolate as an Isolate object.

runtime/lib/isolate.cc

Index: runtime/lib/isolate.cc
diff --git a/runtime/lib/isolate.cc b/runtime/lib/isolate.cc
index 82a0fc183b7c452bf0c8531bc913c5cd77a96323..215e66dc713128fde3c58ee4ee358ec94d6e7c1f 100644
--- a/runtime/lib/isolate.cc
+++ b/runtime/lib/isolate.cc
@@ -250,6 +250,17 @@ DEFINE_NATIVE_ENTRY(Isolate_spawnUri, 5) {
 }
 
 
+DEFINE_NATIVE_ENTRY(Isolate_getCurrent, 0) {
+  const Array& result = Array::Handle(Array::New(3));
+  result.SetAt(0, SendPort::Handle(SendPort::New(isolate->main_port())));
+  result.SetAt(1, Capability::Handle(
+                      Capability::New(isolate->pause_capability())));
+  result.SetAt(2, Capability::Handle(
+                      Capability::New(isolate->terminate_capability())));

[Lasse Reichstein Nielsen, 2014/12/02 10:47:39]

This doesn't seem to be working.
Ivan: Does the VM canonicalize capability objects when sent through SendPorts,
so it can get away with using identity as equality?
(If so, I need some canonicalization here)

+  return result.raw();
+}
+
+
 DEFINE_NATIVE_ENTRY(Isolate_sendOOB, 2) {
   GET_NON_NULL_NATIVE_ARGUMENT(SendPort, port, arguments->NativeArgAt(0));
   GET_NON_NULL_NATIVE_ARGUMENT(Array, msg, arguments->NativeArgAt(1));