LayoutDescriptorHelper is now able to calculate the length of contiguous regions of tagged/non-tagg…

src/heap/objects-visiting.h

Index: src/heap/objects-visiting.h
diff --git a/src/heap/objects-visiting.h b/src/heap/objects-visiting.h
index 30054f058afbfb413cac4336881f6f763aa01eda..f8c58dd8169f657bd0a223fbc6b4cab2caf2e1ef 100644
--- a/src/heap/objects-visiting.h
+++ b/src/heap/objects-visiting.h
@@ -226,16 +226,14 @@ class BodyVisitorBase : public AllStatic {
     DCHECK(IsAligned(start_offset, kPointerSize) &&
            IsAligned(end_offset, kPointerSize));
 
-    InobjectPropertiesHelper helper(object->map());
+    LayoutDescriptorHelper helper(object->map());
     DCHECK(!helper.all_fields_tagged());
-
-    for (int offset = start_offset; offset < end_offset;
-         offset += kPointerSize) {
-      // Visit tagged fields only.
-      if (helper.IsTagged(offset)) {
-        // TODO(ishell): call this once for contiguous region of tagged fields.
-        IterateRawPointers(heap, object, offset, offset + kPointerSize);
+    for (int offset = start_offset; offset < end_offset;) {
+      int end_of_region_offset;
+      if (helper.IsTagged(offset, end_offset, &end_of_region_offset)) {
+        IterateRawPointers(heap, object, offset, end_of_region_offset);
       }
+      offset = end_of_region_offset;
     }
   }
 };