Provide a way for iterating through all external strings referenced from the JS heap

src/heap-profiler.cc

Index: src/heap-profiler.cc
===================================================================
--- src/heap-profiler.cc	(revision 10391)
+++ src/heap-profiler.cc	(working copy)
@@ -104,6 +104,18 @@
       class_id, Utils::ToLocal(Handle<Object>(wrapper)));
 }
 
+void HeapProfiler::VisitExternalResources(ExternalResourceVisitor* visitor) {
+  HEAP->CollectAllGarbage(Heap::kMakeHeapIterableMask);
+  AssertNoAllocation no_allocation;
+  HeapIterator iterator;
+  for (HeapObject* obj = iterator.next(); obj != NULL; obj = iterator.next()) {
+    if (!obj->IsString())

[mnaganov (inactive), 2012/01/11 18:50:23]

Why not obj->IsExternalString()?

[yurys, 2012/01/11 19:50:13]

Done.

+      continue;
+    String* string= String::cast(obj);
+    if (StringShape(string).IsExternal())
+      visitor->VisitExternalString(string);
+  }
+}
 
 HeapSnapshot* HeapProfiler::TakeSnapshotImpl(const char* name,
                                              int type,