[heap] Decouple old generation allocation limit from external memory.

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 1334 matching lines @@
   inline void IncrementNodesCopiedInNewSpace() { nodes_copied_in_new_space_++; }
 
   inline void IncrementNodesPromoted() { nodes_promoted_++; }
 
   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();
-    }
-    if (total < 0) return 0;
-    return static_cast<intptr_t>(total);
-  }
-
   inline void UpdateNewSpaceAllocationCounter();
 
   inline size_t NewSpaceAllocationCounter();
 
   // This should be used only for testing.
   void set_new_space_allocation_counter(size_t new_value) {
     new_space_allocation_counter_ = new_value;
   }
 
   void UpdateOldGenerationAllocationCounter() {
@@ skipping 422 matching lines @@
   void ProcessYoungWeakReferences(WeakObjectRetainer* retainer);
   void ProcessNativeContexts(WeakObjectRetainer* retainer);
   void ProcessAllocationSites(WeakObjectRetainer* retainer);
   void ProcessWeakListRoots(WeakObjectRetainer* retainer);
 
   // ===========================================================================
   // GC statistics. ============================================================
   // ===========================================================================
 
   inline intptr_t OldGenerationSpaceAvailable() {
-    return old_generation_allocation_limit_ - PromotedTotalSize();
+    return old_generation_allocation_limit_ - PromotedSpaceSizeOfObjects();
   }
 
   // Returns maximum GC pause.
   double get_max_gc_pause() { return max_gc_pause_; }
 
   // Returns maximum size of objects alive after GC.
   intptr_t get_max_alive_after_gc() { return max_alive_after_gc_; }
 
   // Returns minimal interval between two subsequent collections.
   double get_min_in_mutator() { return min_in_mutator_; }
@@ skipping 823 matching lines @@
   friend class LargeObjectSpace;
   friend class NewSpace;
   friend class PagedSpace;
   DISALLOW_COPY_AND_ASSIGN(AllocationObserver);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_HEAP_H_