[heap] No leakage of objects-visiting.h outside of heap.

src/heap/mark-compact.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/mark-compact.h"
 
 #include "src/base/atomicops.h"
 #include "src/base/bits.h"
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
@@ skipping 19 matching lines @@
 namespace v8 {
 namespace internal {
 
 
 const char* Marking::kWhiteBitPattern = "00";
 const char* Marking::kBlackBitPattern = "10";
 const char* Marking::kGreyBitPattern = "11";
 const char* Marking::kImpossibleBitPattern = "01";
 
 
+// The following has to hold in order for {Marking::MarkBitFrom} to not produce
+// invalid {kImpossibleBitPattern} in the marking bitmap by overlapping.
+STATIC_ASSERT(Heap::kMinObjectSizeInWords >= 2);
+
+
 // -------------------------------------------------------------------------
 // MarkCompactCollector
 
 MarkCompactCollector::MarkCompactCollector(Heap* heap)
     :  // NOLINT
 #ifdef DEBUG
       state_(IDLE),
 #endif
       marking_parity_(ODD_MARKING_PARITY),
       compacting_(false),
@@ skipping 4616 matching lines @@
   SlotsBuffer* buffer = *buffer_address;
   while (buffer != NULL) {
     SlotsBuffer* next_buffer = buffer->next();
     DeallocateBuffer(buffer);
     buffer = next_buffer;
   }
   *buffer_address = NULL;
 }
 }  // namespace internal
 }  // namespace v8