[api] Remove marking persistents as partially dependent

src/heap/heap.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/heap.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/ast/context-slot-cache.h"
 #include "src/base/bits.h"
@@ skipping 1615 matching lines @@
   //
   // There is guaranteed to be enough room at the top of the to space
   // for the addresses of promoted objects: every object promoted
   // frees up its size in bytes from the top of the new space, and
   // objects are at least one pointer in size.
   Address new_space_front = new_space_->ToSpaceStart();
   promotion_queue_.Initialize();
 
   ScavengeVisitor scavenge_visitor(this);
 
-  if (FLAG_scavenge_reclaim_unmodified_objects) {
-    isolate()->global_handles()->IdentifyWeakUnmodifiedObjects(
-        &IsUnmodifiedHeapObject);
-  }
+  isolate()->global_handles()->IdentifyWeakUnmodifiedObjects(
+      &IsUnmodifiedHeapObject);
 
   {
     // Copy roots.
     TRACE_GC(tracer(), GCTracer::Scope::SCAVENGER_ROOTS);
     IterateRoots(&scavenge_visitor, VISIT_ALL_IN_SCAVENGE);
   }
 
   {
     // Copy objects reachable from the old generation.
     TRACE_GC(tracer(), GCTracer::Scope::SCAVENGER_OLD_TO_NEW_POINTERS);
@@ skipping 27 matching lines @@
     if (collector->is_code_flushing_enabled()) {
       collector->code_flusher()->IteratePointersToFromSpace(&scavenge_visitor);
     }
   }
 
   {
     TRACE_GC(tracer(), GCTracer::Scope::SCAVENGER_SEMISPACE);
     new_space_front = DoScavenge(&scavenge_visitor, new_space_front);
   }
 
-  if (FLAG_scavenge_reclaim_unmodified_objects) {
-    isolate()->global_handles()->MarkNewSpaceWeakUnmodifiedObjectsPending(
-        &IsUnscavengedHeapObject);
+  isolate()->global_handles()->MarkNewSpaceWeakUnmodifiedObjectsPending(
+      &IsUnscavengedHeapObject);
 
-    isolate()->global_handles()->IterateNewSpaceWeakUnmodifiedRoots(
-        &scavenge_visitor);
-    new_space_front = DoScavenge(&scavenge_visitor, new_space_front);
-  } else {
-    TRACE_GC(tracer(), GCTracer::Scope::SCAVENGER_OBJECT_GROUPS);
-    while (isolate()->global_handles()->IterateObjectGroups(
-        &scavenge_visitor, &IsUnscavengedHeapObject)) {
-      new_space_front = DoScavenge(&scavenge_visitor, new_space_front);
-    }
-    isolate()->global_handles()->RemoveObjectGroups();
-    isolate()->global_handles()->RemoveImplicitRefGroups();
-
-    isolate()->global_handles()->IdentifyNewSpaceWeakIndependentHandles(
-        &IsUnscavengedHeapObject);
-
-    isolate()->global_handles()->IterateNewSpaceWeakIndependentRoots(
-        &scavenge_visitor);
-    new_space_front = DoScavenge(&scavenge_visitor, new_space_front);
-  }
+  isolate()->global_handles()->IterateNewSpaceWeakUnmodifiedRoots(
+      &scavenge_visitor);
+  new_space_front = DoScavenge(&scavenge_visitor, new_space_front);
 
   UpdateNewSpaceReferencesInExternalStringTable(
       &UpdateNewSpaceReferenceInExternalStringTableEntry);
 
   promotion_queue_.Destroy();
 
   incremental_marking()->UpdateMarkingDequeAfterScavenge();
 
   ScavengeWeakObjectRetainer weak_object_retainer(this);
   ProcessYoungWeakReferences(&weak_object_retainer);
@@ skipping 4754 matching lines @@
 }
 
 
 // static
 int Heap::GetStaticVisitorIdForMap(Map* map) {
   return StaticVisitorBase::GetVisitorId(map);
 }
 
 }  // namespace internal
 }  // namespace v8