Make "length" and "BYTES_PER_ELEMENT" properties of typed arrays accessible.

Review URL: http://codereview.chromium.org/6805010

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7527 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

samples/shell.cc

@@ -466,6 +466,10 @@ v8::Handle<v8::Value> CreateExternalArray(const v8::Arguments& args,
       v8::Persistent<v8::Object>::New(array);
   persistent_array.MakeWeak(data, ExternalArrayWeakCallback);
   array->SetIndexedPropertiesToExternalArrayData(data, type, length);
+  array->Set(v8::String::New("length"), v8::Int32::New(length),
+             v8::ReadOnly);
+  array->Set(v8::String::New("BYTES_PER_ELEMENT"),
+             v8::Int32::New(element_size));
   return array;
 }
 

test/mjsunit/external-array.js

@@ -38,3 +38,24 @@ for (var i = 0; i < 1000000; i++) {
 
 assertEquals(0, a[0]);
 assertEquals(0, a[1]);
+
+// Test the correct behavior of the |length| property (which is read-only).
+a = new Int32Array(42);
+assertEquals(42, a.length);
+a.length = 2;
+assertEquals(42, a.length);
+assertTrue(delete a.length);
+a.length = 2
+assertEquals(2, a.length);
+
+// Test the correct behavior of the |BYTES_PER_ELEMENT| property (which is
+// "constant", but not read-only).
+a = new Int32Array(2);
+assertEquals(4, a.BYTES_PER_ELEMENT);
+a.BYTES_PER_ELEMENT = 42;
+assertEquals(42, a.BYTES_PER_ELEMENT);
+a = new Uint8Array(2);
+assertEquals(1, a.BYTES_PER_ELEMENT);
+a = new Int16Array(2);
+assertEquals(2, a.BYTES_PER_ELEMENT);
+