Decouple root visitors from object visitors.

src/heap/incremental-marking.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/heap/incremental-marking.h"
 
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
 #include "src/conversions.h"
 #include "src/heap/gc-idle-time-handler.h"
 #include "src/heap/gc-tracer.h"
 #include "src/heap/heap-inl.h"
 #include "src/heap/mark-compact-inl.h"
 #include "src/heap/object-stats.h"
 #include "src/heap/objects-visiting-inl.h"
 #include "src/heap/objects-visiting.h"
 #include "src/tracing/trace-event.h"
 #include "src/v8.h"
+#include "src/visitors.h"
 
 namespace v8 {
 namespace internal {
 
 IncrementalMarking::IncrementalMarking(Heap* heap)
     : heap_(heap),
       state_(STOPPED),
       initial_old_generation_size_(0),
       bytes_marked_ahead_of_schedule_(0),
       unscanned_bytes_of_large_object_(0),
@@ skipping 243 matching lines @@
     if ((page->owner() != nullptr) && (page->owner()->identity() == LO_SPACE)) {
       // IterateBlackObject requires us to visit the whole object.
       page->ResetProgressBar();
     }
     Map* map = object->map();
     MarkGrey(heap_, map);
     IncrementalMarkingMarkingVisitor::IterateBody(map, object);
   }
 }
 
-class IncrementalMarkingRootMarkingVisitor : public ObjectVisitor {
+class IncrementalMarkingRootMarkingVisitor : public RootVisitor {
  public:
   explicit IncrementalMarkingRootMarkingVisitor(
       IncrementalMarking* incremental_marking)
       : heap_(incremental_marking->heap()) {}
 
-  void VisitPointer(Object** p) override { MarkObjectByPointer(p); }
+  void VisitRootPointer(Root root, Object** p) override {
+    MarkObjectByPointer(p);
+  }
 
-  void VisitPointers(Object** start, Object** end) override {
+  void VisitRootPointers(Root root, Object** start, Object** end) override {
     for (Object** p = start; p < end; p++) MarkObjectByPointer(p);
   }
 
  private:
   void MarkObjectByPointer(Object** p) {
     Object* obj = *p;
     if (!obj->IsHeapObject()) return;
 
     IncrementalMarking::MarkGrey(heap_, HeapObject::cast(obj));
   }
@@ skipping 873 matching lines @@
   idle_marking_delay_counter_++;
 }
 
 
 void IncrementalMarking::ClearIdleMarkingDelayCounter() {
   idle_marking_delay_counter_ = 0;
 }
 
 }  // namespace internal
 }  // namespace v8