Implement crankshaft support for pixel array loads.

src/objects.h

 // Copyright 2010 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 3574 matching lines @@
       set_bit_field2(bit_field2() | (1 << kHasFastElements));
     } else {
       set_bit_field2(bit_field2() & ~(1 << kHasFastElements));
     }
   }
 
   inline bool has_fast_elements() {
     return ((1 << kHasFastElements) & bit_field2()) != 0;
   }
 
+  // Tells whether an instance has pixel array elements.
+  inline void set_has_pixel_array_elements(bool value) {
+    if (value) {
+      set_bit_field2(bit_field2() | (1 << kHasPixelArrayElements));
+    } else {
+      set_bit_field2(bit_field2() & ~(1 << kHasPixelArrayElements));
+    }
+  }
+
+  inline bool has_pixel_array_elements() {
+    return ((1 << kHasPixelArrayElements) & bit_field2()) != 0;
+  }
+
   // Tells whether the map is attached to SharedFunctionInfo
   // (for inobject slack tracking).
   inline void set_attached_to_shared_function_info(bool value);
 
   inline bool attached_to_shared_function_info();
 
   // Tells whether the map is shared between objects that may have different
   // behavior. If true, the map should never be modified, instead a clone
   // should be created and modified.
   inline void set_is_shared(bool value);
@@ skipping 38 matching lines @@
   // Returns this map if it has the fast elements bit set, otherwise
   // returns a copy of the map, with all transitions dropped from the
   // descriptors and the fast elements bit set.
   MUST_USE_RESULT inline MaybeObject* GetFastElementsMap();
 
   // Returns this map if it has the fast elements bit cleared,
   // otherwise returns a copy of the map, with all transitions dropped
   // from the descriptors and the fast elements bit cleared.
   MUST_USE_RESULT inline MaybeObject* GetSlowElementsMap();
 
+  // Returns this map if it has the pixel array elements bit is set, otherwise
+  // returns a copy of the map, with all transitions dropped from the
+  // descriptors and the pixel array elements bit set.
+  MUST_USE_RESULT inline MaybeObject* GetPixelArrayElementsMap();
+
   // Returns the property index for name (only valid for FAST MODE).
   int PropertyIndexFor(String* name);
 
   // Returns the next free property index (only valid for FAST MODE).
   int NextFreePropertyIndex();
 
   // Returns the number of properties described in instance_descriptors.
   int NumberOfDescribedProperties();
 
   // Casting.
@@ skipping 98 matching lines @@
   static const int kHasInstanceCallHandler = 6;
   static const int kIsAccessCheckNeeded = 7;
 
   // Bit positions for bit field 2
   static const int kIsExtensible = 0;
   static const int kFunctionWithPrototype = 1;
   static const int kHasFastElements = 2;
   static const int kStringWrapperSafeForDefaultValueOf = 3;
   static const int kAttachedToSharedFunctionInfo = 4;
   static const int kIsShared = 5;
+  static const int kHasPixelArrayElements = 6;
 
   // Layout of the default cache. It holds alternating name and code objects.
   static const int kCodeCacheEntrySize = 2;
   static const int kCodeCacheEntryNameOffset = 0;
   static const int kCodeCacheEntryCodeOffset = 1;
 
   typedef FixedBodyDescriptor<kPointerFieldsBeginOffset,
                               kPointerFieldsEndOffset,
                               kSize> BodyDescriptor;
 
@@ skipping 2718 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_