Reland "[heap] Fine-grained JSArrayBuffer tracking"

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/scopeinfo.h"
 #include "src/base/bits.h"
@@ skipping 142 matching lines @@
       ring_buffer_full_(false),
       ring_buffer_end_(0),
       promotion_queue_(this),
       configured_(false),
       current_gc_flags_(Heap::kNoGCFlags),
       current_gc_callback_flags_(GCCallbackFlags::kNoGCCallbackFlags),
       external_string_table_(this),
       gc_callbacks_depth_(0),
       deserialization_complete_(false),
       strong_roots_list_(NULL),
-      array_buffer_tracker_(NULL),
       heap_iterator_depth_(0),
       force_oom_(false) {
 // Allow build-time customization of the max semispace size. Building
 // V8 with snapshots and a non-default max semispace size is much
 // easier if you can define it as part of the build environment.
 #if defined(V8_MAX_SEMISPACE_SIZE)
   max_semi_space_size_ = reserved_semispace_size_ = V8_MAX_SEMISPACE_SIZE;
 #endif
 
   // Ensure old_generation_size_ is a multiple of kPageSize.
@@ skipping 1454 matching lines @@
 
   scavenge_collector_->SelectScavengingVisitorsTable();
 
   if (UsingEmbedderHeapTracer()) {
     // Register found wrappers with embedder so he can add them to his marking
     // deque and correctly manage the case when v8 scavenger collects the
     // wrappers by either keeping wrappables alive, or cleaning marking deque.
     mark_compact_collector()->RegisterWrappersWithEmbedderHeapTracer();
   }
 
-  array_buffer_tracker()->PrepareDiscoveryInNewSpace();
-
   // Flip the semispaces.  After flipping, to space is empty, from space has
   // live objects.
   new_space_.Flip();
   new_space_.ResetAllocationInfo();
 
   // We need to sweep newly copied objects which can be either in the
   // to space or promoted to the old generation.  For to-space
   // objects, we treat the bottom of the to space as a queue.  Newly
   // copied and unswept objects lie between a 'front' mark and the
   // allocation pointer.
@@ skipping 104 matching lines @@
   incremental_marking()->UpdateMarkingDequeAfterScavenge();
 
   ScavengeWeakObjectRetainer weak_object_retainer(this);
   ProcessYoungWeakReferences(&weak_object_retainer);
 
   DCHECK(new_space_front == new_space_.top());
 
   // Set age mark.
   new_space_.set_age_mark(new_space_.top());
 
-  array_buffer_tracker()->FreeDead(true);
+  ArrayBufferTracker::FreeDeadInNewSpace(this);
 
   // Update how much has survived scavenge.
   IncrementYoungSurvivorsCounter(static_cast<int>(
       (PromotedSpaceSizeOfObjects() - survived_watermark) + new_space_.Size()));
 
   LOG(isolate_, ResourceEvent("scavenge", "end"));
 
   gc_state_ = NOT_IN_GC;
 }
 
@@ skipping 265 matching lines @@
   return object;
 }
 
 
 HeapObject* Heap::DoubleAlignForDeserialization(HeapObject* object, int size) {
   return AlignWithFiller(object, size - kPointerSize, size, kDoubleAligned);
 }
 
 
 void Heap::RegisterNewArrayBuffer(JSArrayBuffer* buffer) {
-  return array_buffer_tracker()->RegisterNew(buffer);
+  ArrayBufferTracker::RegisterNew(this, buffer);
 }
 
 
 void Heap::UnregisterArrayBuffer(JSArrayBuffer* buffer) {
-  return array_buffer_tracker()->Unregister(buffer);
+  ArrayBufferTracker::Unregister(this, buffer);
 }
 
 
 void Heap::ConfigureInitialOldGenerationSize() {
   if (!old_generation_size_configured_ && tracer()->SurvivalEventsRecorded()) {
     old_generation_allocation_limit_ =
         Max(kMinimumOldGenerationAllocationLimit,
             static_cast<intptr_t>(
                 static_cast<double>(old_generation_allocation_limit_) *
                 (tracer()->AverageSurvivalRatio() / 100)));
@@ skipping 3275 matching lines @@
 
   gc_idle_time_handler_ = new GCIdleTimeHandler();
 
   memory_reducer_ = new MemoryReducer(this);
 
   object_stats_ = new ObjectStats(this);
   object_stats_->ClearObjectStats(true);
 
   scavenge_job_ = new ScavengeJob();
 
-  array_buffer_tracker_ = new ArrayBufferTracker(this);
-
   LOG(isolate_, IntPtrTEvent("heap-capacity", Capacity()));
   LOG(isolate_, IntPtrTEvent("heap-available", Available()));
 
   store_buffer()->SetUp();
 
   mark_compact_collector()->SetUp();
 
   idle_scavenge_observer_ = new IdleScavengeObserver(
       *this, ScavengeJob::kBytesAllocatedBeforeNextIdleTask);
   new_space()->AddAllocationObserver(idle_scavenge_observer_);
@@ skipping 139 matching lines @@
     delete memory_reducer_;
     memory_reducer_ = nullptr;
   }
 
   delete object_stats_;
   object_stats_ = nullptr;
 
   delete scavenge_job_;
   scavenge_job_ = nullptr;
 
-  delete array_buffer_tracker_;
-  array_buffer_tracker_ = nullptr;
-
   isolate_->global_handles()->TearDown();
 
   external_string_table_.TearDown();
 
   delete tracer_;
   tracer_ = nullptr;
 
   new_space_.TearDown();
 
   if (old_space_ != NULL) {
@@ skipping 890 matching lines @@
 }
 
 
 // static
 int Heap::GetStaticVisitorIdForMap(Map* map) {
   return StaticVisitorBase::GetVisitorId(map);
 }
 
 }  // namespace internal
 }  // namespace v8