Move aligned allocation to the platform files.

src/spaces.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 313 matching lines @@
     }
   }
 
   void set_owner(Space* space) {
     ASSERT((reinterpret_cast<intptr_t>(space) & kFailureTagMask) == 0);
     owner_ = reinterpret_cast<Address>(space) + kFailureTag;
     ASSERT((reinterpret_cast<intptr_t>(owner_) & kFailureTagMask) ==
            kFailureTag);
   }
 
+  VirtualMemory* reservation() {
+    return &reservation_;
+  }
+
+  void initialize_reservation() {
+    reservation_.Reset();
+  }
+
+  void set_reservation(VirtualMemory* reservation) {
+    ASSERT_NOT_NULL(reservation);
+    reservation_.TakeControl(reservation);
+  }
+
   bool scan_on_scavenge() { return IsFlagSet(SCAN_ON_SCAVENGE); }
   void initialize_scan_on_scavenge(bool scan) {
     if (scan) {
       SetFlag(SCAN_ON_SCAVENGE);
     } else {
       ClearFlag(SCAN_ON_SCAVENGE);
     }
   }
   inline void set_scan_on_scavenge(bool scan);
 
@@ skipping 103 matching lines @@
     MemoryChunk::FromAddress(address)->IncrementLiveBytes(by);
   }
 
   static const intptr_t kAlignment =
       (static_cast<uintptr_t>(1) << kPageSizeBits);
 
   static const intptr_t kAlignmentMask = kAlignment - 1;
 
   static const intptr_t kLiveBytesOffset =
       kPointerSize + kPointerSize + kPointerSize + kPointerSize +
-      kPointerSize + kPointerSize + kIntSize;
+      kPointerSize + kPointerSize + kPointerSize + kPointerSize +
+      kIntSize;
 
   static const size_t kSlotsBufferOffset = kLiveBytesOffset + kIntSize;
 
   static const size_t kHeaderSize = kSlotsBufferOffset + kPointerSize;
 
   static const int kBodyOffset =
     CODE_POINTER_ALIGN(MAP_POINTER_ALIGN(kHeaderSize + Bitmap::kSize));
 
   // The start offset of the object area in a page. Aligned to both maps and
   // code alignment to be suitable for both.  Also aligned to 32 words because
@@ skipping 78 matching lines @@
     ASSERT(slots_buffer_ == NULL);
     ClearFlag(EVACUATION_CANDIDATE);
   }
 
 
  protected:
   MemoryChunk* next_chunk_;
   MemoryChunk* prev_chunk_;
   size_t size_;
   intptr_t flags_;
+  // If the chunk needs to remember its memory reservation, it is stored here.
+  VirtualMemory reservation_;
   // The identity of the owning space.  This is tagged as a failure pointer, but
   // no failure can be in an object, so this can be distinguished from any entry
   // in a fixed array.
   Address owner_;
   Heap* heap_;
   // Used by the store buffer to keep track of which pages to mark scan-on-
   // scavenge.
   int store_buffer_counter_;
   // Count of bytes marked black on page.
   int live_byte_count_;
@@ skipping 312 matching lines @@
 
 #ifdef DEBUG
   // Reports statistic info of the space.
   void ReportStatistics();
 #endif
 
   MemoryChunk* AllocateChunk(intptr_t body_size,
                              Executability executable,
                              Space* space);
 
-  Address AllocateAlignedMemory(const size_t requested,
+  Address ReserveAlignedMemory(size_t requested,
+                               size_t alignment,
+                               VirtualMemory* controller);
+  Address AllocateAlignedMemory(size_t requested,
                                 size_t alignment,
                                 Executability executable,
-                                size_t* allocated_size);
+                                VirtualMemory* controller);
 
-  Address ReserveAlignedMemory(const size_t requested,
-                               size_t alignment,
-                               size_t* allocated_size);
-
+  void FreeMemory(VirtualMemory* reservation, Executability executable);
   void FreeMemory(Address addr, size_t size, Executability executable);
 
   // Commit a contiguous block of memory from the initial chunk.  Assumes that
   // the address is not NULL, the size is greater than zero, and that the
   // block is contained in the initial chunk.  Returns true if it succeeded
   // and false otherwise.
   bool CommitBlock(Address start, size_t size, Executability executable);
 
   // Uncommit a contiguous block of memory [start..(start+size)[.
   // start is not NULL, the size is greater than zero, and the
@@ skipping 1018 matching lines @@
 // The new space consists of a contiguous pair of semispaces.  It simply
 // forwards most functions to the appropriate semispace.
 
 class NewSpace : public Space {
  public:
   // Constructor.
   explicit NewSpace(Heap* heap)
     : Space(heap, NEW_SPACE, NOT_EXECUTABLE),
       to_space_(heap, kToSpace),
       from_space_(heap, kFromSpace),
+      reservation_(),
       inline_allocation_limit_step_(0) {}
 
   // Sets up the new space using the given chunk.
   bool Setup(int reserved_semispace_size_, int max_semispace_size);
 
   // Tears down the space.  Heap memory was not allocated by the space, so it
   // is not deallocated here.
   void TearDown();
 
   // True if the space has been set up but not torn down.
@@ skipping 200 matching lines @@
  private:
   // Update allocation info to match the current to-space page.
   void UpdateAllocationInfo();
 
   Address chunk_base_;
   uintptr_t chunk_size_;
 
   // The semispaces.
   SemiSpace to_space_;
   SemiSpace from_space_;
+  VirtualMemory reservation_;
   int pages_used_;
 
   // Start address and bit mask for containment testing.
   Address start_;
   uintptr_t address_mask_;
   uintptr_t object_mask_;
   uintptr_t object_expected_;
 
   // Allocation pointer and limit for normal allocation and allocation during
   // mark-compact collection.
@@ skipping 350 matching lines @@
   }
   // Must be small, since an iteration is used for lookup.
   static const int kMaxComments = 64;
 };
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_SPACES_H_