Speed up ArrayBuffer/typed array/DataView properties.

src/accessors.cc

 // 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 60 matching lines @@
 MaybeObject* Accessors::ReadOnlySetAccessor(Isolate* isolate,
                                             JSObject*,
                                             Object* value,
                                             void*) {
   // According to ECMA-262, section 8.6.2.2, page 28, setting
   // read-only properties must be silently ignored.
   return value;
 }
 
 
+static V8_INLINE bool CheckForName(Handle<String> name,
+                                   String* property_name,
+                                   int offset,
+                                   int* object_offset) {
+  if (name->Equals(property_name)) {
+    *object_offset = offset;
+    return true;
+  }
+  return false;
+}
+
+
+bool Accessors::IsJSObjectFieldAccessor(
+      Handle<Map> map, Handle<String> name,
+      int* object_offset) {
+  Isolate* isolate = map->GetIsolate();
+  switch (map->instance_type()) {
+    case JS_ARRAY_TYPE:
+      return
+        CheckForName(name, isolate->heap()->length_string(),
+                     JSArray::kLengthOffset, object_offset);
+    case JS_TYPED_ARRAY_TYPE:
+      return
+        CheckForName(name, isolate->heap()->length_string(),
+                     JSTypedArray::kLengthOffset, object_offset) ||
+        CheckForName(name, isolate->heap()->byte_length_string(),
+                     JSTypedArray::kByteLengthOffset, object_offset) ||
+        CheckForName(name, isolate->heap()->byte_offset_string(),
+                     JSTypedArray::kByteOffsetOffset, object_offset) ||
+        CheckForName(name, isolate->heap()->buffer_string(),
+                     JSTypedArray::kBufferOffset, object_offset);
+    case JS_ARRAY_BUFFER_TYPE:
+      return
+        CheckForName(name, isolate->heap()->byte_length_string(),
+                     JSArrayBuffer::kByteLengthOffset, object_offset);
+    case JS_DATA_VIEW_TYPE:
+      return
+        CheckForName(name, isolate->heap()->byte_length_string(),
+                     JSDataView::kByteLengthOffset, object_offset) ||
+        CheckForName(name, isolate->heap()->byte_offset_string(),
+                     JSDataView::kByteOffsetOffset, object_offset) ||
+        CheckForName(name, isolate->heap()->buffer_string(),
+                     JSDataView::kBufferOffset, object_offset);
+    default: {
+      if (map->instance_type() < FIRST_NONSTRING_TYPE) {
+        return
+          CheckForName(name, isolate->heap()->length_string(),
+                       String::kLengthOffset, object_offset);
+      }
+      return false;
+    }
+  }
+}
+
+
 //
 // Accessors::ArrayLength
 //
 
 
 MaybeObject* Accessors::ArrayGetLength(Isolate* isolate,
                                        Object* object,
                                        void*) {
   // Traverse the prototype chain until we reach an array.
   JSArray* holder = FindInstanceOf<JSArray>(isolate, object);
@@ skipping 816 matching lines @@
   info->set_data(Smi::FromInt(index));
   Handle<Object> getter = v8::FromCData(isolate, &ModuleGetExport);
   Handle<Object> setter = v8::FromCData(isolate, &ModuleSetExport);
   info->set_getter(*getter);
   if (!(attributes & ReadOnly)) info->set_setter(*setter);
   return info;
 }
 
 
 } }  // namespace v8::internal