node/deps/v8/test/mjsunit/element-kind.js

// Copyright 2011 the V8 project authors. All rights reserved.
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// 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));