Reland of "[heap] Parallel newspace evacuation, semispace copy, and compaction \o/"

src/heap/heap.h

 // 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.
 
 #ifndef V8_HEAP_HEAP_H_
 #define V8_HEAP_HEAP_H_
 
 #include <cmath>
 #include <map>
 
@@ skipping 432 matching lines @@
   };
 
   // Indicates whether live bytes adjustment is triggered
   // - from within the GC code before sweeping started (SEQUENTIAL_TO_SWEEPER),
   // - or from within GC (CONCURRENT_TO_SWEEPER),
   // - or mutator code (CONCURRENT_TO_SWEEPER).
   enum InvocationMode { SEQUENTIAL_TO_SWEEPER, CONCURRENT_TO_SWEEPER };
 
   enum PretenuringFeedbackInsertionMode { kCached, kGlobal };
 
+  enum FindMementoMode { kForRuntime, kForGC };
+
   enum HeapState { NOT_IN_GC, SCAVENGE, MARK_COMPACT };
 
   // Taking this lock prevents the GC from entering a phase that relocates
   // object references.
   class RelocationLock {
    public:
     explicit RelocationLock(Heap* heap) : heap_(heap) {
       heap_->relocation_mutex_.Lock();
     }
 
@@ skipping 269 matching lines @@
 
   // Print short heap statistics.
   void PrintShortHeapStatistics();
 
   inline HeapState gc_state() { return gc_state_; }
 
   inline bool IsInGCPostProcessing() { return gc_post_processing_depth_ > 0; }
 
   // If an object has an AllocationMemento trailing it, return it, otherwise
   // return NULL;
+  template <FindMementoMode mode>
   inline AllocationMemento* FindAllocationMemento(HeapObject* object);
 
   // Returns false if not able to reserve.
   bool ReserveSpace(Reservation* reservations);
 
   //
   // Support for the API.
   //
 
   void CreateApiObjects();
@@ skipping 460 matching lines @@
   // Returns the available bytes in space w/o growing.
   // Heap doesn't guarantee that it can allocate an object that requires
   // all available bytes. Check MaxHeapObjectSize() instead.
   intptr_t Available();
 
   // Returns of size of all objects residing in the heap.
   intptr_t SizeOfObjects();
 
   void UpdateSurvivalStatistics(int start_new_space_size);
 
-  inline void IncrementPromotedObjectsSize(int object_size) {
+  inline void IncrementPromotedObjectsSize(intptr_t object_size) {
     DCHECK_GE(object_size, 0);
     promoted_objects_size_ += object_size;
   }
   inline intptr_t promoted_objects_size() { return promoted_objects_size_; }
 
-  inline void IncrementSemiSpaceCopiedObjectSize(int object_size) {
+  inline void IncrementSemiSpaceCopiedObjectSize(intptr_t object_size) {
     DCHECK_GE(object_size, 0);
     semi_space_copied_object_size_ += object_size;
   }
   inline intptr_t semi_space_copied_object_size() {
     return semi_space_copied_object_size_;
   }
 
   inline intptr_t SurvivedNewSpaceObjectSize() {
     return promoted_objects_size_ + semi_space_copied_object_size_;
   }
 
   inline void IncrementNodesDiedInNewSpace() { nodes_died_in_new_space_++; }
 
   inline void IncrementNodesCopiedInNewSpace() { nodes_copied_in_new_space_++; }
 
   inline void IncrementNodesPromoted() { nodes_promoted_++; }
 
-  inline void IncrementYoungSurvivorsCounter(int survived) {
-    DCHECK(survived >= 0);
+  inline void IncrementYoungSurvivorsCounter(intptr_t survived) {
+    DCHECK_GE(survived, 0);
     survived_last_scavenge_ = survived;
     survived_since_last_expansion_ += survived;
   }
 
   inline intptr_t PromotedTotalSize() {
     int64_t total = PromotedSpaceSizeOfObjects() + PromotedExternalMemorySize();
     if (total > std::numeric_limits<intptr_t>::max()) {
       // TODO(erikcorry): Use uintptr_t everywhere we do heap size calculations.
       return std::numeric_limits<intptr_t>::max();
     }
@@ skipping 728 matching lines @@
   int initial_semispace_size_;
   int target_semispace_size_;
   intptr_t max_old_generation_size_;
   intptr_t initial_old_generation_size_;
   bool old_generation_size_configured_;
   intptr_t max_executable_size_;
   intptr_t maximum_committed_;
 
   // For keeping track of how much data has survived
   // scavenge since last new space expansion.
-  int survived_since_last_expansion_;
+  intptr_t survived_since_last_expansion_;
 
   // ... and since the last scavenge.
-  int survived_last_scavenge_;
+  intptr_t survived_last_scavenge_;
 
   // This is not the depth of nested AlwaysAllocateScope's but rather a single
   // count, as scopes can be acquired from multiple tasks (read: threads).
   AtomicNumber<size_t> always_allocate_scope_count_;
 
   // For keeping track of context disposals.
   int contexts_disposed_;
 
   // The length of the retained_maps array at the time of context disposal.
   // This separates maps in the retained_maps array that were created before
@@ skipping 642 matching lines @@
 
  private:
   friend class NewSpace;
   DISALLOW_COPY_AND_ASSIGN(InlineAllocationObserver);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_HEAP_H_