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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
// Flags: --track-allocation-sites --noalways-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));
support_smi_only_arrays = true;
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;
}
function isHoley(obj) {
if (%HasFastHoleyElements(obj)) return true;
return false;
}
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);
}
if (support_smi_only_arrays) {
// Test: If a call site goes megamorphic, it loses the ability to
// use allocation site feedback.
(function() {
function bar(t, len) {
return new t(len);
}
a = bar(Array, 10);
a[0] = 3.5;
b = bar(Array, 1);
assertKind(elements_kind.fast_double, b);
c = bar(Object, 3);
b = bar(Array, 10);
assertKind(elements_kind.fast_smi_only, b);
b[0] = 3.5;
c = bar(Array, 10);
assertKind(elements_kind.fast_smi_only, c);
})();
// Test: ensure that crankshafted array constructor sites are deopted
// if another function is used.
(function() {
function bar0(t) {
return new t();
}
a = bar0(Array);
a[0] = 3.5;
b = bar0(Array);
assertKind(elements_kind.fast_double, b);
%OptimizeFunctionOnNextCall(bar0);
b = bar0(Array);
assertKind(elements_kind.fast_double, b);
assertTrue(2 != %GetOptimizationStatus(bar0));
// bar0 should deopt
b = bar0(Object);
assertTrue(1 != %GetOptimizationStatus(bar0));
// When it's re-optimized, we should call through the full stub
bar0(Array);
%OptimizeFunctionOnNextCall(bar0);
b = bar0(Array);
// We also lost our ability to record kind feedback, as the site
// is megamorphic now.
assertKind(elements_kind.fast_smi_only, b);
assertTrue(2 != %GetOptimizationStatus(bar0));
b[0] = 3.5;
c = bar0(Array);
assertKind(elements_kind.fast_smi_only, c);
})();
// Test: Ensure that bailouts from the stub don't deopt a crankshafted
// method with a call to that stub.
(function() {
function bar(len) {
return new Array(len);
}
a = bar(10);
a[0] = "a string";
a = bar(10);
assertKind(elements_kind.fast, a);
%OptimizeFunctionOnNextCall(bar);
a = bar(10);
assertKind(elements_kind.fast, a);
assertTrue(2 != %GetOptimizationStatus(bar));
// The stub bails out, but the method call should be fine.
a = bar(100000);
assertTrue(2 != %GetOptimizationStatus(bar));
assertKind(elements_kind.dictionary, a);
// If the argument isn't a smi, it bails out as well
a = bar("oops");
assertTrue(2 != %GetOptimizationStatus(bar));
assertKind(elements_kind.fast, a);
function barn(one, two, three) {
return new Array(one, two, three);
}
barn(1, 2, 3);
barn(1, 2, 3);
%OptimizeFunctionOnNextCall(barn);
barn(1, 2, 3);
assertTrue(2 != %GetOptimizationStatus(barn));
a = barn(1, "oops", 3);
// The stub should bail out but the method should remain optimized.
assertKind(elements_kind.fast, a);
assertTrue(2 != %GetOptimizationStatus(barn));
})();
// Test: When a method with array constructor is crankshafted, the type
// feedback for elements kind is baked in. Verify that transitions don't
// change it anymore
(function() {
function bar() {
return new Array();
}
a = bar();
bar();
%OptimizeFunctionOnNextCall(bar);
b = bar();
// This only makes sense to test if we allow crankshafting
if (4 != %GetOptimizationStatus(bar)) {
assertTrue(2 != %GetOptimizationStatus(bar));
%DebugPrint(3);
b[0] = 3.5;
c = bar();
assertKind(elements_kind.fast_smi_only, c);
assertTrue(2 != %GetOptimizationStatus(bar));
}
})();
// Test: create arrays in two contexts, verifying that the correct
// map for Array in that context will be used.
(function() {
function bar() { return new Array(); }
bar();
bar();
%OptimizeFunctionOnNextCall(bar);
a = bar();
assertTrue(a instanceof Array);
var contextB = Realm.create();
Realm.eval(contextB, "function bar2() { return new Array(); };");
Realm.eval(contextB, "bar2(); bar2();");
Realm.eval(contextB, "%OptimizeFunctionOnNextCall(bar2);");
Realm.eval(contextB, "bar2();");
assertFalse(Realm.eval(contextB, "bar2();") instanceof Array);
assertTrue(Realm.eval(contextB, "bar2() instanceof Array"));
})();
}
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