Treat pointers in optimized code as strong before all weak dependencies are registered.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 613bc60c2f01afcb3e9e5350375303e8720b95af..b12b1b1eefb2fddc577443356686fd329c25efe6 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -4857,6 +4857,21 @@ inline void Code::set_is_turbofanned(bool value) {
 }
 
 
+inline bool Code::can_have_weak_objects() {
+  DCHECK(kind() == OPTIMIZED_FUNCTION);

[Hannes Payer (out of office), 2015/01/22 14:38:59]

Let's DCHECk !is_turbofanned().

[ulan, 2015/01/22 15:01:16]

Added a check that turbofanned code cannot have weak objects in object.h.

+  return CanHaveWeakObjectsField::decode(
+      READ_UINT32_FIELD(this, kKindSpecificFlags1Offset));
+}
+
+
+inline void Code::set_can_have_weak_objects(bool value) {
+  DCHECK(kind() == OPTIMIZED_FUNCTION);
+  int previous = READ_UINT32_FIELD(this, kKindSpecificFlags1Offset);
+  int updated = CanHaveWeakObjectsField::update(previous, value);
+  WRITE_UINT32_FIELD(this, kKindSpecificFlags1Offset, updated);
+}
+
+
 bool Code::optimizable() {
   DCHECK_EQ(FUNCTION, kind());
   return READ_BYTE_FIELD(this, kOptimizableOffset) == 1;