Expose ArrayBufferView::HasBuffer

src/api.cc

 // Copyright 2012 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/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 6453 matching lines @@
             i::JSArrayBuffer::cast(typed_array->buffer()));
         source = reinterpret_cast<char*>(buffer->backing_store());
       }
     }
     memcpy(dest, source + byte_offset, bytes_to_copy);
   }
   return bytes_to_copy;
 }
 
 
+bool v8::ArrayBufferView::HasBuffer() const {
+  i::Handle<i::JSArrayBufferView> obj = Utils::OpenHandle(this);
+  if (obj->IsJSDataView()) return true;
+  DCHECK(obj->IsJSTypedArray());
+  i::Handle<i::JSTypedArray> typed_array(i::JSTypedArray::cast(*obj));
+  return !typed_array->buffer()->IsSmi();
+}
+
+
 size_t v8::ArrayBufferView::ByteOffset() {
   i::Handle<i::JSArrayBufferView> obj = Utils::OpenHandle(this);
   return static_cast<size_t>(obj->byte_offset()->Number());
 }
 
 
 size_t v8::ArrayBufferView::ByteLength() {
   i::Handle<i::JSArrayBufferView> obj = Utils::OpenHandle(this);
   return static_cast<size_t>(obj->byte_length()->Number());
 }
@@ skipping 1616 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 } }  // namespace v8::internal