[heap] Non-contiguous young generation

src/heap/spaces-inl.h

Index: src/heap/spaces-inl.h
diff --git a/src/heap/spaces-inl.h b/src/heap/spaces-inl.h
index 8a79ad027516270b3c9c921b6aa3eb24b11d9bbb..bdd779fc8a7e8ff57a98d0c8aebfd03eae47f9b1 100644
--- a/src/heap/spaces-inl.h
+++ b/src/heap/spaces-inl.h
@@ -169,6 +169,21 @@ LargePage* LargePageIterator::next() {
 // -----------------------------------------------------------------------------
 // MemoryAllocator
 
+template <typename PageType, MemoryAllocator::AllocationMode mode,
+          typename SpaceType>
+inline PageType* MemoryAllocator::AllocatePage(intptr_t size, SpaceType* owner,
+                                               Executability executable) {
+  MemoryChunk* chunk = nullptr;
+  if (mode == kPooled) {
+    chunk = AllocatePagePooled(owner, executable);
+  }
+  if (chunk == nullptr) {
+    chunk = AllocateChunk(size, size, executable, owner);
+  }
+  if (chunk == nullptr) return nullptr;
+  return PageType::Initialize(isolate_->heap(), chunk, executable, owner);
+}
+
 #ifdef ENABLE_HEAP_PROTECTION
 
 void MemoryAllocator::Protect(Address start, size_t size) {
@@ -251,6 +266,19 @@ AllocationSpace AllocationResult::RetrySpace() {
   return static_cast<AllocationSpace>(Smi::cast(object_)->value());
 }
 
+NewSpacePage* NewSpacePage::Initialize(Heap* heap, MemoryChunk* chunk,
+                                       Executability executable,
+                                       SemiSpace* owner) {
+  DCHECK_EQ(executable, Executability::NOT_EXECUTABLE);
+  bool in_to_space = (owner->id() != kFromSpace);
+  chunk->SetFlag(in_to_space ? MemoryChunk::IN_TO_SPACE
+                             : MemoryChunk::IN_FROM_SPACE);
+  DCHECK(!chunk->IsFlagSet(in_to_space ? MemoryChunk::IN_FROM_SPACE
+                                       : MemoryChunk::IN_TO_SPACE));
+  NewSpacePage* page = static_cast<NewSpacePage*>(chunk);
+  heap->incremental_marking()->SetNewSpacePageFlags(page);
+  return page;
+}
 
 // --------------------------------------------------------------------------
 // PagedSpace
@@ -261,6 +289,7 @@ Page* Page::Initialize(Heap* heap, MemoryChunk* chunk, Executability executable,
   page->mutex_ = new base::Mutex();
   DCHECK(page->area_size() <= kAllocatableMemory);
   DCHECK(chunk->owner() == owner);
+
   owner->IncreaseCapacity(page->area_size());
   heap->incremental_marking()->SetOldSpacePageFlags(chunk);