Ports page for isolates

runtime/vm/port.cc

Index: runtime/vm/port.cc
diff --git a/runtime/vm/port.cc b/runtime/vm/port.cc
index 5a7506852cfe941ece58c05bc03907f0e7813704..3451ec6b34995197f24c9218e33e557911cf7536 100644
--- a/runtime/vm/port.cc
+++ b/runtime/vm/port.cc
@@ -4,6 +4,7 @@
 
 #include "vm/port.h"
 
+#include "vm/dart_entry.h"
 #include "platform/utils.h"
 #include "vm/dart_api_impl.h"
 #include "vm/isolate.h"
@@ -301,4 +302,27 @@ void PortMap::InitOnce() {
   deleted_ = 0;
 }
 
+
+void PortMap::PrintPortsForMessageHandler(MessageHandler* handler,
+                                          JSONStream* stream) {
+  JSONObject jsobj(stream);
+  jsobj.AddProperty("type", "_Ports");
+  Object& msg_handler = Object::Handle();
+  {
+    JSONArray ports(&jsobj, "ports");
+    MutexLocker ml(mutex_);
+    for (intptr_t i = 0; i < capacity_; i++) {
+      if (map_[i].handler == handler) {
+        if (map_[i].state == kLivePort) {
+          JSONObject port(&ports);
+          port.AddProperty("type", "_Port");
+          port.AddPropertyF("name", "Isolate Port (%" Pd64 ")", map_[i].port);
+          msg_handler = DartLibraryCalls::LookupHandler(map_[i].port);
+          port.AddProperty("handler", msg_handler);
+        }
+      }
+    }
+  }
+}
+
 }  // namespace dart