Provide named links to code objects in heap snapshot.

R=loislo@chromium.org, verwaest@chromium.org, yurys@chromium.org

Review URL: https://codereview.chromium.org/19397002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15722 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/api.cc

@@ -7556,6 +7556,7 @@ Handle<Value> HeapGraphEdge::GetName() const {
           isolate->factory()->InternalizeUtf8String(edge->name()));
     case i::HeapGraphEdge::kElement:
     case i::HeapGraphEdge::kHidden:
+    case i::HeapGraphEdge::kWeak:
       return ToApiHandle<Number>(
           isolate->factory()->NewNumberFromInt(edge->index()));
     default: UNREACHABLE();

src/heap-snapshot-generator.cc

@@ -894,6 +894,11 @@ class IndexedReferencesExtractor : public ObjectVisitor {
         parent_(parent),
         next_index_(1) {
   }
+  void VisitCodeEntry(Address entry_address) {
+     Code* code = Code::cast(Code::GetObjectFromEntryAddress(entry_address));
+     generator_->SetInternalReference(parent_obj_, parent_, "code", code);
+     generator_->TagObject(code, "(code)");
+  }
   void VisitPointers(Object** start, Object** end) {
     for (Object** p = start; p < end; p++) {
       if (CheckVisitedAndUnmark(p)) continue;