[heap] Add concurrency-safe refilling to compaction spaces

src/heap/spaces.h

 // Copyright 2011 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_SPACES_H_
 #define V8_HEAP_SPACES_H_
 
 #include "src/allocation.h"
 #include "src/atomic-utils.h"
 #include "src/base/atomicops.h"
@@ skipping 2103 matching lines @@
 
   // Generic fast case allocation function that tries aligned linear allocation
   // at the address denoted by top in allocation_info_. Writes the aligned
   // allocation size, which includes the filler size, to size_in_bytes.
   inline HeapObject* AllocateLinearlyAligned(int* size_in_bytes,
                                              AllocationAlignment alignment);
 
   // If sweeping is still in progress try to sweep unswept pages. If that is
   // not successful, wait for the sweeper threads and re-try free-list
   // allocation.
-  MUST_USE_RESULT HeapObject* WaitForSweeperThreadsAndRetryAllocation(
+  MUST_USE_RESULT virtual HeapObject* SweepAndRetryAllocation(
       int size_in_bytes);
 
   // Slow path of AllocateRaw.  This function is space-dependent.
   MUST_USE_RESULT HeapObject* SlowAllocateRaw(int size_in_bytes);
 
   int area_size_;
 
   // Accounting information for this space.
   AllocationStats accounting_stats_;
 
@@ skipping 696 matching lines @@
     Free(start, size_in_bytes);
   }
 
   virtual bool is_local() override { return true; }
 
   virtual void RefillFreeList() override;
 
  protected:
   // The space is temporary and not included in any snapshots.
   virtual bool snapshotable() override { return false; }
+
+  MUST_USE_RESULT virtual HeapObject* SweepAndRetryAllocation(
+      int size_in_bytes) override;
 };
 
 
 // A collection of |CompactionSpace|s used by a single compaction task.
 class CompactionSpaceCollection : public Malloced {
  public:
   explicit CompactionSpaceCollection(Heap* heap)
       : old_space_(heap, OLD_SPACE, Executability::NOT_EXECUTABLE),
         code_space_(heap, CODE_SPACE, Executability::EXECUTABLE) {}
 
@@ skipping 205 matching lines @@
     count = 0;
   }
   // Must be small, since an iteration is used for lookup.
   static const int kMaxComments = 64;
 };
 #endif
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_SPACES_H_