v8/test/mjsunit/array-feedback.js
danno@chromium.org afcfa7d2b7 Keep new arrays allocated with 'new Array(N)' in fast mode (revisited)
Also explicit length setting with a.length = N should remain in fast mode.

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/416403002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22645 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2014-07-28 13:12:26 +00:00

210 lines
6.0 KiB
JavaScript

// 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 --expose-gc
// Flags: --noalways-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 (%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;
}
function isHoley(obj) {
if (%HasFastHoleyElements(obj)) return true;
return false;
}
function assertKind(expected, obj, name_opt) {
assertEquals(expected, getKind(obj), name_opt);
}
// Verify that basic elements kind feedback works for non-constructor
// array calls (as long as the call is made through an IC, and not
// a CallStub).
(function (){
function create0() {
return Array();
}
// Calls through ICs need warm up through uninitialized, then
// premonomorphic first.
create0();
a = create0();
assertKind(elements_kind.fast_smi_only, a);
a[0] = 3.5;
b = create0();
assertKind(elements_kind.fast_double, b);
function create1(arg) {
return Array(arg);
}
create1(0);
create1(0);
a = create1(0);
assertFalse(isHoley(a));
assertKind(elements_kind.fast_smi_only, a);
a[0] = "hello";
b = create1(10);
assertTrue(isHoley(b));
assertKind(elements_kind.fast, b);
a = create1(100000);
assertKind(elements_kind.fast_smi_only, a);
function create3(arg1, arg2, arg3) {
return Array(arg1, arg2, arg3);
}
create3(1,2,3);
create3(1,2,3);
a = create3(1,2,3);
a[0] = 3.035;
assertKind(elements_kind.fast_double, a);
b = create3(1,2,3);
assertKind(elements_kind.fast_double, b);
assertFalse(isHoley(b));
})();
// Verify that keyed calls work
(function (){
function create0(name) {
return this[name]();
}
name = "Array";
create0(name);
create0(name);
a = create0(name);
a[0] = 3.5;
b = create0(name);
assertKind(elements_kind.fast_double, b);
})();
// Verify that feedback is turned off if the call site goes megamorphic.
(function (){
function foo(arg) { return arg(); }
foo(Array);
foo(function() {});
foo(Array);
gc();
a = foo(Array);
a[0] = 3.5;
b = foo(Array);
// b doesn't benefit from elements kind feedback at a megamorphic site.
assertKind(elements_kind.fast_smi_only, b);
})();
// Verify that crankshaft consumes type feedback.
(function (){
function create0() {
return Array();
}
create0();
create0();
a = create0();
a[0] = 3.5;
%OptimizeFunctionOnNextCall(create0);
create0();
create0();
b = create0();
assertKind(elements_kind.fast_double, b);
assertOptimized(create0);
function create1(arg) {
return Array(arg);
}
create1(8);
create1(8);
a = create1(8);
a[0] = 3.5;
%OptimizeFunctionOnNextCall(create1);
b = create1(8);
assertKind(elements_kind.fast_double, b);
assertOptimized(create1);
function createN(arg1, arg2, arg3) {
return Array(arg1, arg2, arg3);
}
createN(1, 2, 3);
createN(1, 2, 3);
a = createN(1, 2, 3);
a[0] = 3.5;
%OptimizeFunctionOnNextCall(createN);
b = createN(1, 2, 3);
assertKind(elements_kind.fast_double, b);
assertOptimized(createN);
})();
// Verify that cross context calls work
(function (){
var realmA = Realm.current();
var realmB = Realm.create();
assertEquals(0, realmA);
assertEquals(1, realmB);
function instanceof_check(type) {
assertTrue(type() instanceof type);
assertTrue(type(5) instanceof type);
assertTrue(type(1,2,3) instanceof type);
}
var realmBArray = Realm.eval(realmB, "Array");
instanceof_check(Array);
instanceof_check(Array);
instanceof_check(Array);
instanceof_check(realmBArray);
instanceof_check(realmBArray);
instanceof_check(realmBArray);
})();