Make the full object memory size of a page available for a single allocation.

BUG=
R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/145493004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18774 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/heap.cc

@@ -2936,7 +2936,7 @@ MaybeObject* Heap::AllocateHeapNumber(double value, PretenureFlag pretenure) {
   // Statically ensure that it is safe to allocate heap numbers in paged
   // spaces.
   int size = HeapNumber::kSize;
-  STATIC_ASSERT(HeapNumber::kSize <= Page::kNonCodeObjectAreaSize);
+  STATIC_ASSERT(HeapNumber::kSize <= Page::kMaxNonCodeHeapObjectSize);
   AllocationSpace space = SelectSpace(size, OLD_DATA_SPACE, pretenure);
 
   Object* result;
@@ -2952,7 +2952,7 @@ MaybeObject* Heap::AllocateHeapNumber(double value, PretenureFlag pretenure) {
 
 MaybeObject* Heap::AllocateCell(Object* value) {
   int size = Cell::kSize;
-  STATIC_ASSERT(Cell::kSize <= Page::kNonCodeObjectAreaSize);
+  STATIC_ASSERT(Cell::kSize <= Page::kMaxNonCodeHeapObjectSize);
 
   Object* result;
   { MaybeObject* maybe_result = AllocateRaw(size, CELL_SPACE, CELL_SPACE);
@@ -2966,7 +2966,7 @@ MaybeObject* Heap::AllocateCell(Object* value) {
 
 MaybeObject* Heap::AllocatePropertyCell() {
   int size = PropertyCell::kSize;
-  STATIC_ASSERT(PropertyCell::kSize <= Page::kNonCodeObjectAreaSize);
+  STATIC_ASSERT(PropertyCell::kSize <= Page::kMaxNonCodeHeapObjectSize);
 
   Object* result;
   MaybeObject* maybe_result =
@@ -5348,7 +5348,7 @@ MaybeObject* Heap::AllocateHashTable(int length, PretenureFlag pretenure) {
 
 MaybeObject* Heap::AllocateSymbol() {
   // Statically ensure that it is safe to allocate symbols in paged spaces.
-  STATIC_ASSERT(Symbol::kSize <= Page::kNonCodeObjectAreaSize);
+  STATIC_ASSERT(Symbol::kSize <= Page::kMaxNonCodeHeapObjectSize);
 
   Object* result;
   MaybeObject* maybe =

src/spaces-inl.h

@@ -165,7 +165,7 @@ Page* Page::Initialize(Heap* heap,
                        Executability executable,
                        PagedSpace* owner) {
   Page* page = reinterpret_cast<Page*>(chunk);
-  ASSERT(page->area_size() <= kNonCodeObjectAreaSize);
+  ASSERT(page->area_size() <= kMaxNonCodeHeapObjectSize);
   ASSERT(chunk->owner() == owner);
   owner->IncreaseCapacity(page->area_size());
   owner->Free(page->area_start(), page->area_size());

src/spaces.h

@@ -779,15 +779,11 @@ class Page : public MemoryChunk {
   // Page size in bytes.  This must be a multiple of the OS page size.
   static const int kPageSize = 1 << kPageSizeBits;
 
-  // Object area size in bytes.
-  static const int kNonCodeObjectAreaSize = kPageSize - kObjectStartOffset;
-
   // Maximum object size that fits in a page. Objects larger than that size
   // are allocated in large object space and are never moved in memory. This
   // also applies to new space allocation, since objects are never migrated
   // from new space to large object space.  Takes double alignment into account.
-  static const int kMaxNonCodeHeapObjectSize =
-      kNonCodeObjectAreaSize - kPointerSize;
+  static const int kMaxNonCodeHeapObjectSize = kPageSize - kObjectStartOffset;
 
   // Page size mask.
   static const intptr_t kPageAlignmentMask = (1 << kPageSizeBits) - 1;
@@ -2013,7 +2009,7 @@ class NewSpacePage : public MemoryChunk {
     (1 << MemoryChunk::POINTERS_FROM_HERE_ARE_INTERESTING) |
     (1 << MemoryChunk::SCAN_ON_SCAVENGE);
 
-  static const int kAreaSize = Page::kNonCodeObjectAreaSize;
+  static const int kAreaSize = Page::kMaxNonCodeHeapObjectSize;
 
   inline NewSpacePage* next_page() const {
     return static_cast<NewSpacePage*>(next_chunk());
@@ -2673,7 +2669,7 @@ class MapSpace : public PagedSpace {
   virtual void VerifyObject(HeapObject* obj);
 
  private:
-  static const int kMapsPerPage = Page::kNonCodeObjectAreaSize / Map::kSize;
+  static const int kMapsPerPage = Page::kMaxNonCodeHeapObjectSize / Map::kSize;
 
   // Do map space compaction if there is a page gap.
   int CompactionThreshold() {

test/mjsunit/mjsunit.status

@@ -35,9 +35,6 @@
   # BUG(v8:2921).
   'debug-step-4-in-frame': [PASS, FAIL, SLOW],
 
-  # TODO(hpayer): Investigate.
-  'json2': [PASS, FLAKY],
-
   ##############################################################################
   # Fails.
   'regress/regress-1119': [FAIL],