51 lines
1.8 KiB
JavaScript
51 lines
1.8 KiB
JavaScript
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// Copyright 2016 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --allow-natives-syntax --noalways-opt
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var elements_kind = {
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fast_smi_only : 'fast smi only elements',
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fast : 'fast elements',
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fast_double : 'fast double elements',
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dictionary : 'dictionary elements',
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}
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function getKind(obj) {
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if (%HasFastSmiElements(obj)) return elements_kind.fast_smi_only;
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if (%HasFastObjectElements(obj)) return elements_kind.fast;
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if (%HasFastDoubleElements(obj)) return elements_kind.fast_double;
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if (%HasDictionaryElements(obj)) return elements_kind.dictionary;
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}
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function assertKind(expected, obj, name_opt) {
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assertEquals(expected, getKind(obj), name_opt);
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}
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(function() {
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function make1() { return new Array(); }
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function make2() { return new Array(); }
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function make3() { return new Array(); }
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function foo(a, i) { a[0] = i; }
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function run_test(maker_function) {
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var one = maker_function();
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assertKind(elements_kind.fast_smi_only, one);
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// Use memento to pre-transition allocation site to DOUBLE elements.
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foo(one, 1.5);
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// Newly created arrays should now have DOUBLE elements right away.
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var two = maker_function();
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assertKind(elements_kind.fast_double, two);
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}
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// Initialize the KeyedStoreIC in foo; the actual operation will be done
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// in the runtime.
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run_test(make1);
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// Run again; the IC optimistically assumed to only see the transitioned
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// (double-elements) map again, so this will make it polymorphic.
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// The actual operation will again be done in the runtime.
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run_test(make2);
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// Finally, check if the initialized IC honors the allocation memento.
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run_test(make3);
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})();
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