6904a8120b
.. mostly mentions in mjsunit `Flags:` lines and in comments. Bug: v8:10386 Change-Id: If79dfdc448d0a3f19883ef1f816e77e750cb4061 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3865964 Commit-Queue: Jakob Linke <jgruber@chromium.org> Reviewed-by: Michael Achenbach <machenbach@chromium.org> Reviewed-by: Leszek Swirski <leszeks@chromium.org> Cr-Commit-Position: refs/heads/main@{#82852}
96 lines
2.8 KiB
JavaScript
96 lines
2.8 KiB
JavaScript
// Copyright 2015 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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// Overwrite the value for --noverify-heap and
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// --noenable-slow-asserts, which the test runner already set to true before.
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// Due to flag contradiction checking, this requires
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// --allow-overwriting-for-next-flag to avoid an error.
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// Flags: --allow-overwriting-for-next-flag --noverify-heap
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// Flags: --allow-overwriting-for-next-flag --noenable-slow-asserts
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// Flags: --allow-natives-syntax --turbofan --no-always-turbofan
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// --noverify-heap and --noenable-slow-asserts are set because the test is too
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// slow with it on.
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// Ensure that keyed stores work, and optimized functions learn if the
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// store required change to dictionary mode. Verify that stores that grow
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// the array into large object space don't cause a deopt.
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(function() {
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var a = [];
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function foo(a, i) {
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a[i] = 5.3;
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}
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%PrepareFunctionForOptimization(foo);
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foo(a, 1);
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foo(a, 2);
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foo(a, 3);
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%OptimizeFunctionOnNextCall(foo);
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a[3] = 0;
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foo(a, 3);
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assertEquals(a[3], 5.3);
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foo(a, 50000);
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// TODO(v8:11457) We don't currently support inlining element stores if there
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// is a dictionary mode prototypes on the prototype chain. Therefore, if
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// v8_dict_property_const_tracking is enabled, the optimized code only
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// contains a call to the IC handler and doesn't get deopted.
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assertEquals(%IsDictPropertyConstTrackingEnabled(), isOptimized(foo));
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assertTrue(%HasDictionaryElements(a));
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%PrepareFunctionForOptimization(foo);
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var b = [];
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foo(b, 1);
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foo(b, 2);
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// Put b in dictionary mode.
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b[10000] = 5;
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assertTrue(%HasDictionaryElements(b));
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foo(b, 3);
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%PrepareFunctionForOptimization(foo);
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%OptimizeFunctionOnNextCall(foo);
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foo(b, 50000);
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assertOptimized(foo);
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assertTrue(%HasDictionaryElements(b));
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%ClearFunctionFeedback(foo);
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})();
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(function() {
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var a = new Array(10);
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function foo2(a, i) {
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a[i] = 50;
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}
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// The KeyedStoreIC will learn GROW_MODE.
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%PrepareFunctionForOptimization(foo2);
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foo2(a, 10);
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foo2(a, 12);
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foo2(a, 31);
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%OptimizeFunctionOnNextCall(foo2);
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foo2(a, 40);
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assertOptimized(foo2);
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assertTrue(%HasSmiElements(a));
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// Grow a large array into large object space through the keyed store
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// without deoptimizing. Grow by 9s. If we set elements too sparsely, the
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// array will convert to dictionary mode.
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a = new Array(99999);
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assertTrue(%HasSmiElements(a));
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for (var i = 0; i < 263000; i += 9) {
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foo2(a, i);
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}
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// Verify that we are over 1 page in size, and foo2 remains optimized.
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// This means we've smoothly transitioned to allocating in large object
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// space.
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assertTrue(%HasSmiElements(a));
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assertTrue(a.length * 4 > (1024 * 1024));
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assertOptimized(foo2);
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%ClearFunctionFeedback(foo2);
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})();
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