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..d705a2ce5853e6478712b772642f5cee05b00c58 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_getPortAndCapabilitiesOfCurrentIsolate, 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())));
+  return result.raw();
+}

[Lasse Reichstein Nielsen, 2014/12/03 15:34:30]

The problem with capabilities doesn't seem to originate here - other
capabilities also fail to be equal to copies of themselves.

I think Capability is inheriting equality from Object, and it isn't being
canonicalized when sent through sendports.
The test isolate/capability_test fails, and has likely never worked (it's still
marked as "Fails # not implemented" in the status file).

+
+
 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));