Move double alignment logic into memory allocator.

src/heap/spaces.cc

 // 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.
 
 #include "src/v8.h"
 
 #include "src/base/bits.h"
 #include "src/base/platform/platform.h"
 #include "src/full-codegen.h"
 #include "src/heap/mark-compact.h"
@@ skipping 1440 matching lines @@
 
   int remaining_in_page = static_cast<int>(limit - top);
   heap()->CreateFillerObjectAt(top, remaining_in_page);
   pages_used_++;
   UpdateAllocationInfo();
 
   return true;
 }
 
 
-AllocationResult NewSpace::SlowAllocateRaw(int size_in_bytes) {
+AllocationResult NewSpace::SlowAllocateRaw(int size_in_bytes,
+                                           bool double_aligned) {
   Address old_top = allocation_info_.top();
   Address high = to_space_.page_high();
   if (allocation_info_.limit() < high) {
     // Either the limit has been lowered because linear allocation was disabled
     // or because incremental marking wants to get a chance to do a step. Set
     // the new limit accordingly.
-    Address new_top = old_top + size_in_bytes;
+    int aligned_size = size_in_bytes;
+    aligned_size += (double_aligned ? kPointerSize : 0);
+    Address new_top = old_top + aligned_size;
     int bytes_allocated = static_cast<int>(new_top - top_on_previous_step_);
     heap()->incremental_marking()->Step(bytes_allocated,
                                         IncrementalMarking::GC_VIA_STACK_GUARD);
-    UpdateInlineAllocationLimit(size_in_bytes);
+    UpdateInlineAllocationLimit(aligned_size);
     top_on_previous_step_ = new_top;
+    if (double_aligned) return AllocateRawDoubleAligned(size_in_bytes);
     return AllocateRaw(size_in_bytes);
   } else if (AddFreshPage()) {
     // Switched to new page. Try allocating again.
     int bytes_allocated = static_cast<int>(old_top - top_on_previous_step_);
     heap()->incremental_marking()->Step(bytes_allocated,
                                         IncrementalMarking::GC_VIA_STACK_GUARD);
     top_on_previous_step_ = to_space_.page_low();
+    if (double_aligned) return AllocateRawDoubleAligned(size_in_bytes);
     return AllocateRaw(size_in_bytes);
   } else {
     return AllocationResult::Retry();
   }
 }
 
 
 #ifdef VERIFY_HEAP
 // We do not use the SemiSpaceIterator because verification doesn't assume
 // that it works (it depends on the invariants we are checking).
@@ skipping 1631 matching lines @@
     object->ShortPrint();
     PrintF("\n");
   }
   printf(" --------------------------------------\n");
   printf(" Marked: %x, LiveCount: %x\n", mark_size, LiveBytes());
 }
 
 #endif  // DEBUG
 }
 }  // namespace v8::internal