Introduce Heap::SelectSpace helper for allocations.

src/heap.h

 // Copyright 2012 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 867 matching lines @@
   // A cache is used for ASCII codes.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed. Please note this does not perform a garbage collection.
   MUST_USE_RESULT MaybeObject* LookupSingleCharacterStringFromCode(
       uint16_t code);
 
   // Allocate a byte array of the specified length
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT MaybeObject* AllocateByteArray(int length,
-                                                 PretenureFlag pretenure);
-
-  // Allocate a non-tenured byte array of the specified length
-  // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
-  // failed.
-  // Please note this does not perform a garbage collection.
-  MUST_USE_RESULT MaybeObject* AllocateByteArray(int length);
+  MUST_USE_RESULT MaybeObject* AllocateByteArray(
+      int length,
+      PretenureFlag pretenure = NOT_TENURED);
 
   // Allocates an external array of the specified length and type.
   // Returns Failure::RetryAfterGC(requested_bytes, space) if the allocation
   // failed.
   // Please note this does not perform a garbage collection.
   MUST_USE_RESULT MaybeObject* AllocateExternalArray(
       int length,
       ExternalArrayType array_type,
       void* external_pointer,
       PretenureFlag pretenure);
@@ skipping 1172 matching lines @@
                                           const char** reason);
 
   // Performs garbage collection
   // Returns whether there is a chance another major GC could
   // collect more garbage.
   bool PerformGarbageCollection(GarbageCollector collector,
                                 GCTracer* tracer);
 
   inline void UpdateOldSpaceLimits();
 
+  // Selects the proper allocation space depending on the given object
+  // size, pretenuring decision, and preferred old-space.
+  static AllocationSpace SelectSpace(int object_size,
+                                     AllocationSpace preferred_old_space,
+                                     PretenureFlag pretenure) {
+    ASSERT(preferred_old_space == OLD_POINTER_SPACE ||
+           preferred_old_space == OLD_DATA_SPACE);
+    if (object_size > Page::kMaxNonCodeHeapObjectSize) return LO_SPACE;
+    return (pretenure == TENURED) ? preferred_old_space : NEW_SPACE;
+  }
+
   // Allocate an uninitialized object in map space.  The behavior is identical
   // to Heap::AllocateRaw(size_in_bytes, MAP_SPACE), except that (a) it doesn't
   // have to test the allocation space argument and (b) can reduce code size
   // (since both AllocateRaw and AllocateRawMap are inlined).
   MUST_USE_RESULT inline MaybeObject* AllocateRawMap();
 
   // Allocate an uninitialized object in the simple cell space.
   MUST_USE_RESULT inline MaybeObject* AllocateRawCell();
 
   // Allocate an uninitialized object in the global property cell space.
@@ skipping 946 matching lines @@
   DisallowHeapAllocation no_allocation;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_