First cut at API for native Typed Arrays.

src/objects.cc

 // Copyright 2013 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 12817 matching lines @@
   }
 
   if (result <= static_cast<uint32_t>(Smi::kMaxValue)) {
     return Smi::FromInt(static_cast<int>(result));
   }
   ASSERT_NE(NULL, result_double);
   result_double->set_value(static_cast<double>(result));
   return result_double;
 }
 
+ExternalArrayType JSTypedArray::type() {
+  switch (elements()->map()->instance_type()) {
+    case EXTERNAL_BYTE_ARRAY_TYPE:
+      return kExternalByteArray;
+    case EXTERNAL_UNSIGNED_BYTE_ARRAY_TYPE:
+      return kExternalUnsignedByteArray;
+    case EXTERNAL_SHORT_ARRAY_TYPE:
+      return kExternalShortArray;
+    case EXTERNAL_UNSIGNED_SHORT_ARRAY_TYPE:
+      return kExternalUnsignedShortArray;
+    case EXTERNAL_INT_ARRAY_TYPE:
+      return kExternalIntArray;
+    case EXTERNAL_UNSIGNED_INT_ARRAY_TYPE:
+      return kExternalUnsignedIntArray;
+    case EXTERNAL_FLOAT_ARRAY_TYPE:
+      return kExternalFloatArray;
+    case EXTERNAL_DOUBLE_ARRAY_TYPE:
+      return kExternalDoubleArray;
+    case EXTERNAL_PIXEL_ARRAY_TYPE:
+      return kExternalPixelArray;
+    default:
+      return static_cast<ExternalArrayType>(-1);
+  }
+}
+
 
 Object* ExternalPixelArray::SetValue(uint32_t index, Object* value) {
   uint8_t clamped_value = 0;
   if (index < static_cast<uint32_t>(length())) {
     if (value->IsSmi()) {
       int int_value = Smi::cast(value)->value();
       if (int_value < 0) {
         clamped_value = 0;
       } else if (int_value > 255) {
         clamped_value = 255;
@@ skipping 1669 matching lines @@
   set_year(Smi::FromInt(year), SKIP_WRITE_BARRIER);
   set_month(Smi::FromInt(month), SKIP_WRITE_BARRIER);
   set_day(Smi::FromInt(day), SKIP_WRITE_BARRIER);
   set_weekday(Smi::FromInt(weekday), SKIP_WRITE_BARRIER);
   set_hour(Smi::FromInt(hour), SKIP_WRITE_BARRIER);
   set_min(Smi::FromInt(min), SKIP_WRITE_BARRIER);
   set_sec(Smi::FromInt(sec), SKIP_WRITE_BARRIER);
 }
 
 } }  // namespace v8::internal