Fix code flusher to process weak function links.

src/mark-compact.cc

Index: src/mark-compact.cc
diff --git a/src/mark-compact.cc b/src/mark-compact.cc
index 412bc6b736fb9b6d58820476c0fdf881cca56074..641293399e6297d6824c2d07ee1d0ecf6cddd91b 100644
--- a/src/mark-compact.cc
+++ b/src/mark-compact.cc
@@ -952,6 +952,21 @@ void CodeFlusher::EvictCandidate(JSFunction* function) {
 }
 
 
+void CodeFlusher::IteratePointersToFromSpace(ObjectVisitor* v) {
+  Heap* heap = isolate_->heap();
+
+  JSFunction** slot = &jsfunction_candidates_head_;
+  JSFunction* candidate = jsfunction_candidates_head_;
+  while (candidate != NULL) {
+    if (heap->InFromSpace(candidate)) {
+      v->VisitPointer(reinterpret_cast<Object**>(slot));
+    }
+    candidate = GetNextCandidate(*slot);

[ulan_google, 2012/10/26 09:15:28]

candidate = GetNextCandidate(candidate);

Would be more robust w.r.t. reordering of these two lines.

[Michael Starzinger, 2012/10/26 09:39:39]

We cannot use the candidate variable here, because the visitor most probably
updated the referenced stored at the slot. So we need to reload the reference
and candidate should be considered a stale value at this point.

+    slot = GetNextCandidateSlot(*slot);
+  }
+}
+
+
 MarkCompactCollector::~MarkCompactCollector() {
   if (code_flusher_ != NULL) {
     delete code_flusher_;