- Handle doubles transferred in message snapshots specially.

runtime/vm/snapshot.cc

Index: runtime/vm/snapshot.cc
===================================================================
--- runtime/vm/snapshot.cc	(revision 34648)
+++ runtime/vm/snapshot.cc	(working copy)
@@ -779,6 +779,10 @@
   if (object_id == kFalseValue) {
     return Bool::False().raw();
   }
+  if (object_id == kDoubleObject) {
+    ASSERT(kind_ == Snapshot::kMessage);
+    return Double::New(ReadDouble());
+  }
   intptr_t class_id = ClassIdFromObjectId(object_id);
   if (IsSingletonClassId(class_id)) {
     return isolate()->class_table()->At(class_id);  // get singleton class.
@@ -1208,6 +1212,13 @@
     return true;
   }
 
+  if ((kind_ == Snapshot::kMessage) && (rawobj->GetClassId() == kDoubleCid)) {
+    WriteVMIsolateObject(kDoubleObject);
+    RawDouble* rd = reinterpret_cast<RawDouble*>(rawobj);
+    WriteDouble(rd->ptr()->value_);
+    return true;
+  }

[siva, 2014/04/03 00:23:16]

We should probably consider caching the class id in a local variable here as it
is used multiple times in the code below.

[Ivan Posva, 2014/04/03 00:58:02]

Done.

+
   // Check if object has already been serialized, in that case just write
   // the object id out.
   uword tags = rawobj->ptr()->tags_;