exposing some methods from objects.h (alternative to counters)

test/mjsunit/element-kind.js

+// Copyright 2011 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
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Flags: --allow-natives-syntax
+// Test element kind of objects
+
+var element_kind = {
+  fast_elements                     :  1,
+  fast_double_elements              :  2,
+  dictionary_elements               :  3,
+  external_byte_elements            :  4,
+  external_unsigned_byte_elements   :  5,
+  external_short_elements           :  6,
+  external_unsigned_short_elements  :  7,
+  external_int_elements             :  8,
+  external_unsigned_int_elements    :  9,
+  external_float_elements           : 10,
+  external_double_elements          : 11,
+  external_pixel_elements           : 12
+}
+
+// We expect an object to only be of one element kind.
+function assertKind(expected, obj){
+  assertEquals(expected == element_kind.fast_elements,
+               %HasFastElements(obj));
+  assertEquals(expected == element_kind.fast_double_elements,
+               %HasFastDoubleElements(obj));
+  assertEquals(expected == element_kind.dictionary_elements,
+               %HasDictionaryElements(obj));
+  assertEquals(expected == element_kind.external_byte_elements,
+               %HasExternalByteElements(obj));
+  assertEquals(expected == element_kind.external_unsigned_byte_elements,
+               %HasExternalUnsignedByteElements(obj));
+  assertEquals(expected == element_kind.external_short_elements,
+               %HasExternalShortElements(obj));
+  assertEquals(expected == element_kind.external_unsigned_short_elements,
+               %HasExternalUnsignedShortElements(obj));
+  assertEquals(expected == element_kind.external_int_elements,
+               %HasExternalIntElements(obj));
+  assertEquals(expected == element_kind.external_unsigned_int_elements,
+               %HasExternalUnsignedIntElements(obj));
+  assertEquals(expected == element_kind.external_float_elements,
+               %HasExternalFloatElements(obj));
+  assertEquals(expected == element_kind.external_double_elements,
+               %HasExternalDoubleElements(obj));
+  assertEquals(expected == element_kind.external_pixel_elements,
+               %HasExternalPixelElements(obj));
+  // every external kind is also an external array
+  assertEquals(expected >= element_kind.external_byte_elements,
+               %HasExternalArrayElements(obj));
+}
+
+var me = {};
+assertKind(element_kind.fast_elements, me);
+me.dance = 0xD15C0;
+me.drink = 0xC0C0A;
+assertKind(element_kind.fast_elements, me);
+
+var you = new Array();
+for(i = 0; i < 1337; i++) {
+  you[i] = i;
+}
+assertKind(element_kind.fast_elements, you);
+
+assertKind(element_kind.dictionary_elements, new Array(0xC0C0A));
+
+// fast_double_elements not yet available
+
+
+assertKind(element_kind.external_byte_elements,           new Int8Array(9001));
+assertKind(element_kind.external_unsigned_byte_elements,  new Uint8Array(007));
+assertKind(element_kind.external_short_elements,          new Int16Array(666));
+assertKind(element_kind.external_unsigned_short_elements, new Uint16Array(42));
+assertKind(element_kind.external_int_elements,            new Int32Array(0xF));
+assertKind(element_kind.external_unsigned_int_elements,   new Uint32Array(23));
+assertKind(element_kind.external_float_elements,          new Float32Array(7));
+assertKind(element_kind.external_double_elements,         new Float64Array(0));
+assertKind(element_kind.external_pixel_elements,          new PixelArray(512));