test/mjsunit/filter-element-kinds.js

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// Flags: --allow-natives-syntax --expose-gc --opt --no-always-opt

var elements_kind = {
  fast_smi_only            :  'fast smi only elements',
  fast                     :  'fast elements',
  fast_double              :  'fast double elements',
  dictionary               :  'dictionary elements',
  external_byte            :  'external byte elements',
  external_unsigned_byte   :  'external unsigned byte elements',
  external_short           :  'external short elements',
  external_unsigned_short  :  'external unsigned short elements',
  external_int             :  'external int elements',
  external_unsigned_int    :  'external unsigned int elements',
  external_float           :  'external float elements',
  external_double          :  'external double elements',
  external_pixel           :  'external pixel elements'
}

function getKind(obj) {
  if (%HasSmiElements(obj)) return elements_kind.fast_smi_only;
  if (%HasObjectElements(obj)) return elements_kind.fast;
  if (%HasDoubleElements(obj)) return elements_kind.fast_double;
  if (%HasDictionaryElements(obj)) return elements_kind.dictionary;
}

function isHoley(obj) {
  if (%HasHoleyElements(obj)) return true;
  return false;
}

function assertKind(expected, obj, name_opt) {
  assertEquals(expected, getKind(obj), name_opt);
}

function assertHoley(obj, name_opt) {
  assertEquals(true, isHoley(obj), name_opt);
}

function assertNotHoley(obj, name_opt) {
  assertEquals(false, isHoley(obj), name_opt);
}

var a;
// Packed literal arrays.
obj = [1, 2, 3];
a = obj.filter(x => false);
assertKind(elements_kind.fast_smi_only, a);
assertNotHoley(a);

obj = [true, true, false];
a = obj.filter(x => false);
assertKind(elements_kind.fast, a);
assertNotHoley(a);

obj = [1.0, 1.5, 3.5];
a = obj.filter(x => false);
assertKind(elements_kind.fast_double, a);
assertNotHoley(a);

// Holey literal arrays.
obj = [1,, 3]; obj[1] = 2;
a = obj.filter(x => false);
assertKind(elements_kind.fast_smi_only, a);
assertHoley(a);

obj = [true,, false]; obj[1] = true;
a = obj.filter(x => false);
assertKind(elements_kind.fast, a);
assertHoley(a);

obj = [1.0,, 3.5]; obj[1] = 1.5;
a = obj.filter(x => false);
assertKind(elements_kind.fast_double, a);
assertHoley(a);

// Packed constructed arrays.
obj = new Array(1, 2, 3);
a = obj.filter(x => false);
assertKind(elements_kind.fast_smi_only, a);
assertNotHoley(a);

obj = new Array(true, true, false);
a = obj.filter(x => false);
assertKind(elements_kind.fast, a);
assertNotHoley(a);

obj = new Array(1.0, 1.5, 3.5);
a = obj.filter(x => false);
assertKind(elements_kind.fast_double, a);
assertNotHoley(a);

// Holey constructed arrays.
obj = new Array(3);
obj[0] = 1; obj[1] = 2; obj[2] = 3;
a = obj.filter(x => false);
assertKind(elements_kind.fast_smi_only, a);
assertHoley(a);

obj = new Array(3);
obj[0] = true; obj[1] = true; obj[2] = false;
a = obj.filter(x => false);
assertKind(elements_kind.fast, a);
assertHoley(a);

obj = new Array(3);
obj[0] = 1.0; obj[1] = 1.5; obj[2] = 3.5;
a = obj.filter(x => false);
assertKind(elements_kind.fast_double, a);
assertHoley(a);