v8/test/mjsunit/elements-kind.js

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// Copyright 2012 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 --smi-only-arrays --expose-gc --nostress-opt
// Test element kind of objects.
// Since --smi-only-arrays affects builtins, its default setting at compile
// time sticks if built with snapshot. If --smi-only-arrays is deactivated
// by default, only a no-snapshot build actually has smi-only arrays enabled
// in this test case. Depending on whether smi-only arrays are actually
// enabled, this test takes the appropriate code path to check smi-only arrays.
support_smi_only_arrays = %HasFastSmiElements(new Array(1,2,3,4,5,6,7,8));
if (support_smi_only_arrays) {
print("Tests include smi-only arrays.");
} else {
print("Tests do NOT include smi-only arrays.");
}
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 (%HasFastSmiElements(obj)) return elements_kind.fast_smi_only;
if (%HasFastObjectElements(obj)) return elements_kind.fast;
if (%HasFastDoubleElements(obj)) return elements_kind.fast_double;
if (%HasDictionaryElements(obj)) return elements_kind.dictionary;
// Every external kind is also an external array.
assertTrue(%HasExternalArrayElements(obj));
if (%HasExternalInt8Elements(obj)) {
return elements_kind.external_byte;
}
if (%HasExternalUint8Elements(obj)) {
return elements_kind.external_unsigned_byte;
}
if (%HasExternalInt16Elements(obj)) {
return elements_kind.external_short;
}
if (%HasExternalUint16Elements(obj)) {
return elements_kind.external_unsigned_short;
}
if (%HasExternalInt32Elements(obj)) {
return elements_kind.external_int;
}
if (%HasExternalUint32Elements(obj)) {
return elements_kind.external_unsigned_int;
}
if (%HasExternalFloat32Elements(obj)) {
return elements_kind.external_float;
}
if (%HasExternalFloat64Elements(obj)) {
return elements_kind.external_double;
}
if (%HasExternalUint8ClampedElements(obj)) {
return elements_kind.external_pixel;
}
}
function assertKind(expected, obj, name_opt) {
if (!support_smi_only_arrays &&
expected == elements_kind.fast_smi_only) {
expected = elements_kind.fast;
}
assertEquals(expected, getKind(obj), name_opt);
}
var me = {};
assertKind(elements_kind.fast, me);
me.dance = 0xD15C0;
me.drink = 0xC0C0A;
assertKind(elements_kind.fast, me);
if (support_smi_only_arrays) {
var too = [1,2,3];
assertKind(elements_kind.fast_smi_only, too);
too.dance = 0xD15C0;
too.drink = 0xC0C0A;
assertKind(elements_kind.fast_smi_only, too);
}
// Make sure the element kind transitions from smi when a non-smi is stored.
function test_wrapper() {
var you = new Array();
assertKind(elements_kind.fast_smi_only, you);
for (var i = 0; i < 1337; i++) {
var val = i;
if (i == 1336) {
assertKind(elements_kind.fast_smi_only, you);
val = new Object();
}
you[i] = val;
}
assertKind(elements_kind.fast, you);
assertKind(elements_kind.dictionary, new Array(0xDECAF));
var fast_double_array = new Array(0xDECAF);
for (var i = 0; i < 0xDECAF; i++) fast_double_array[i] = i / 2;
assertKind(elements_kind.fast_double, fast_double_array);
assertKind(elements_kind.external_byte, new Int8Array(9001));
assertKind(elements_kind.external_unsigned_byte, new Uint8Array(007));
assertKind(elements_kind.external_short, new Int16Array(666));
assertKind(elements_kind.external_unsigned_short, new Uint16Array(42));
assertKind(elements_kind.external_int, new Int32Array(0xF));
assertKind(elements_kind.external_unsigned_int, new Uint32Array(23));
assertKind(elements_kind.external_float, new Float32Array(7));
assertKind(elements_kind.external_double, new Float64Array(0));
assertKind(elements_kind.external_pixel, new Uint8ClampedArray(512));
// Crankshaft support for smi-only array elements.
function monomorphic(array) {
assertKind(elements_kind.fast_smi_only, array);
for (var i = 0; i < 3; i++) {
array[i] = i + 10;
}
assertKind(elements_kind.fast_smi_only, array);
for (var i = 0; i < 3; i++) {
var a = array[i];
assertEquals(i + 10, a);
}
}
var smi_only = new Array(1, 2, 3);
assertKind(elements_kind.fast_smi_only, smi_only);
for (var i = 0; i < 3; i++) monomorphic(smi_only);
%OptimizeFunctionOnNextCall(monomorphic);
monomorphic(smi_only);
}
// The test is called in a wrapper function to eliminate the transition learning
// feedback of AllocationSites.
test_wrapper();
%ClearFunctionTypeFeedback(test_wrapper);
if (support_smi_only_arrays) {
%NeverOptimizeFunction(construct_smis);
// This code exists to eliminate the learning influence of AllocationSites
// on the following tests.
var __sequence = 0;
function make_array_string() {
this.__sequence = this.__sequence + 1;
return "/* " + this.__sequence + " */ [0, 0, 0];"
}
function make_array() {
return eval(make_array_string());
}
function construct_smis() {
var a = make_array();
a[0] = 0; // Send the COW array map to the steak house.
assertKind(elements_kind.fast_smi_only, a);
return a;
}
%NeverOptimizeFunction(construct_doubles);
function construct_doubles() {
var a = construct_smis();
a[0] = 1.5;
assertKind(elements_kind.fast_double, a);
return a;
}
%NeverOptimizeFunction(construct_objects);
function construct_objects() {
var a = construct_smis();
a[0] = "one";
assertKind(elements_kind.fast, a);
return a;
}
// Test crankshafted transition SMI->DOUBLE.
%NeverOptimizeFunction(convert_to_double);
function convert_to_double(array) {
array[1] = 2.5;
assertKind(elements_kind.fast_double, array);
assertEquals(2.5, array[1]);
}
var smis = construct_smis();
for (var i = 0; i < 3; i++) convert_to_double(smis);
%OptimizeFunctionOnNextCall(convert_to_double);
smis = construct_smis();
convert_to_double(smis);
// Test crankshafted transitions SMI->FAST and DOUBLE->FAST.
%NeverOptimizeFunction(convert_to_fast);
function convert_to_fast(array) {
array[1] = "two";
assertKind(elements_kind.fast, array);
assertEquals("two", array[1]);
}
smis = construct_smis();
for (var i = 0; i < 3; i++) convert_to_fast(smis);
var doubles = construct_doubles();
for (var i = 0; i < 3; i++) convert_to_fast(doubles);
smis = construct_smis();
doubles = construct_doubles();
%OptimizeFunctionOnNextCall(convert_to_fast);
convert_to_fast(smis);
convert_to_fast(doubles);
// Test transition chain SMI->DOUBLE->FAST (crankshafted function will
// transition to FAST directly).
%NeverOptimizeFunction(convert_mixed);
function convert_mixed(array, value, kind) {
array[1] = value;
assertKind(kind, array);
assertEquals(value, array[1]);
}
smis = construct_smis();
for (var i = 0; i < 3; i++) {
convert_mixed(smis, 1.5, elements_kind.fast_double);
}
doubles = construct_doubles();
for (var i = 0; i < 3; i++) {
convert_mixed(doubles, "three", elements_kind.fast);
}
convert_mixed(construct_smis(), "three", elements_kind.fast);
convert_mixed(construct_doubles(), "three", elements_kind.fast);
%OptimizeFunctionOnNextCall(convert_mixed);
smis = construct_smis();
doubles = construct_doubles();
convert_mixed(smis, 1, elements_kind.fast);
convert_mixed(doubles, 1, elements_kind.fast);
assertTrue(%HaveSameMap(smis, doubles));
}
// Crankshaft support for smi-only elements in dynamic array literals.
function get(foo) { return foo; } // Used to generate dynamic values.
function crankshaft_test() {
if (support_smi_only_arrays) {
var a1 = [get(1), get(2), get(3)];
assertKind(elements_kind.fast_smi_only, a1);
}
var a2 = new Array(get(1), get(2), get(3));
assertKind(elements_kind.fast_smi_only, a2);
var b = [get(1), get(2), get("three")];
assertKind(elements_kind.fast, b);
var c = [get(1), get(2), get(3.5)];
if (support_smi_only_arrays) {
assertKind(elements_kind.fast_double, c);
}
}
for (var i = 0; i < 3; i++) {
crankshaft_test();
}
%OptimizeFunctionOnNextCall(crankshaft_test);
crankshaft_test();
// Elements_kind transitions for arrays.
// A map can have three different elements_kind transitions: SMI->DOUBLE,
// DOUBLE->OBJECT, and SMI->OBJECT. No matter in which order these three are
// created, they must always end up with the same FAST map.
// This test is meaningless without FAST_SMI_ONLY_ELEMENTS.
if (support_smi_only_arrays) {
// Preparation: create one pair of identical objects for each case.
var a = [1, 2, 3];
var b = [1, 2, 3];
assertTrue(%HaveSameMap(a, b));
assertKind(elements_kind.fast_smi_only, a);
var c = [1, 2, 3];
c["case2"] = true;
var d = [1, 2, 3];
d["case2"] = true;
assertTrue(%HaveSameMap(c, d));
assertFalse(%HaveSameMap(a, c));
assertKind(elements_kind.fast_smi_only, c);
var e = [1, 2, 3];
e["case3"] = true;
var f = [1, 2, 3];
f["case3"] = true;
assertTrue(%HaveSameMap(e, f));
assertFalse(%HaveSameMap(a, e));
assertFalse(%HaveSameMap(c, e));
assertKind(elements_kind.fast_smi_only, e);
// Case 1: SMI->DOUBLE, DOUBLE->OBJECT, SMI->OBJECT.
a[0] = 1.5;
assertKind(elements_kind.fast_double, a);
a[0] = "foo";
assertKind(elements_kind.fast, a);
b[0] = "bar";
assertTrue(%HaveSameMap(a, b));
// Case 2: SMI->DOUBLE, SMI->OBJECT, DOUBLE->OBJECT.
c[0] = 1.5;
assertKind(elements_kind.fast_double, c);
assertFalse(%HaveSameMap(c, d));
d[0] = "foo";
assertKind(elements_kind.fast, d);
assertFalse(%HaveSameMap(c, d));
c[0] = "bar";
assertTrue(%HaveSameMap(c, d));
// Case 3: SMI->OBJECT, SMI->DOUBLE, DOUBLE->OBJECT.
e[0] = "foo";
assertKind(elements_kind.fast, e);
assertFalse(%HaveSameMap(e, f));
f[0] = 1.5;
assertKind(elements_kind.fast_double, f);
assertFalse(%HaveSameMap(e, f));
f[0] = "bar";
assertKind(elements_kind.fast, f);
assertTrue(%HaveSameMap(e, f));
}
// Test if Array.concat() works correctly with DOUBLE elements.
if (support_smi_only_arrays) {
var a = [1, 2];
assertKind(elements_kind.fast_smi_only, a);
var b = [4.5, 5.5];
assertKind(elements_kind.fast_double, b);
var c = a.concat(b);
assertEquals([1, 2, 4.5, 5.5], c);
assertKind(elements_kind.fast_double, c);
}
// Test that Array.push() correctly handles SMI elements.
if (support_smi_only_arrays) {
var a = [1, 2];
assertKind(elements_kind.fast_smi_only, a);
a.push(3, 4, 5);
assertKind(elements_kind.fast_smi_only, a);
assertEquals([1, 2, 3, 4, 5], a);
}
// Test that Array.splice() and Array.slice() return correct ElementsKinds.
if (support_smi_only_arrays) {
var a = ["foo", "bar"];
assertKind(elements_kind.fast, a);
var b = a.splice(0, 1);
assertKind(elements_kind.fast, b);
var c = a.slice(0, 1);
assertKind(elements_kind.fast, c);
}
// Throw away type information in the ICs for next stress run.
gc();