More precompiled snapshotting.

runtime/vm/raw_object_snapshot.cc

Index: runtime/vm/raw_object_snapshot.cc
diff --git a/runtime/vm/raw_object_snapshot.cc b/runtime/vm/raw_object_snapshot.cc
index 06dce1270cfcef8cc55dd362cd12161f0f4d19eb..a5ae22bb75babdc565211d962be2f6eea1c122e4 100644
--- a/runtime/vm/raw_object_snapshot.cc
+++ b/runtime/vm/raw_object_snapshot.cc
@@ -756,15 +756,21 @@ void RawField::WriteTo(SnapshotWriter* writer,
   writer->WriteObjectImpl(ptr()->type_, kAsReference);
   // Write out the initial static value or field offset.
   if (Field::StaticBit::decode(ptr()->kind_bits_)) {
-    // For static field we write out the initial static value.
-    writer->WriteObjectImpl(ptr()->initializer_.saved_value_, kAsReference);
+    if (writer->snapshot_code()) {
+      // For precompiled static fields, the value was already reset and
+      // initializer_ now contains a Function.
+      writer->WriteObjectImpl(ptr()->value_.static_value_, kAsReference);
+    } else {
+      // Otherwise, for static fields we write out the initial static value.
+      writer->WriteObjectImpl(ptr()->initializer_.saved_value_, kAsReference);
+    }
   } else {
     writer->WriteObjectImpl(ptr()->value_.offset_, kAsReference);
   }
   // Write out the dependent code.
   writer->WriteObjectImpl(ptr()->dependent_code_, kAsReference);
   // Write out the initializer value.
-  writer->WriteObjectImpl(ptr()->initializer_.saved_value_, kAsReference);
+  writer->WriteObjectImpl(ptr()->initializer_.precompiled_, kAsReference);

[siva, 2015/09/14 20:32:59]

should this also be conditional under
if (writer->snapshot_code()) {
 .... precompiled_,
} else {
 .... saved_value_,
}
for better readability.

[rmacnak, 2015/09/15 17:56:42]

Done.

   // Write out the guarded list length.
   writer->WriteObjectImpl(ptr()->guarded_list_length_, kAsReference);
 }