42 lines
1.0 KiB
JavaScript
42 lines
1.0 KiB
JavaScript
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// Copyright 2020 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 --turboprop --turbo-dynamic-map-checks
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// Flags: --opt --no-always-opt --deopt-every-n-times=0
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function b(a) { return a; }
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function f(o, should_bailout) {
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b(o.a);
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let did_bailout = (%GetOptimizationStatus(f) &
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V8OptimizationStatus.kTopmostFrameIsTurboFanned) == 0;
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assertEquals(should_bailout, did_bailout);
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}
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var o = {a:10, b:20, c:30};
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var o1 = {a:10, b:20, c:30};
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var o2 = {a:10, b:20, c:30};
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// Make o's map a migration target.
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o1.b = 10.23;
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o.a;
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%PrepareFunctionForOptimization(f);
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f(o, true);
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%OptimizeFunctionOnNextCall(f);
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f(o, false);
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assertOptimized(f);
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// Deprecate o's new map again and update the feedback vector but don't migrate
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// o.
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o1.c = 20.23;
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f(o1, true);
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assertOptimized(f);
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// We migrates o's map without deopting or bailing out.
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f(o, false);
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f(o1, false);
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f(o2, false);
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assertOptimized(f);
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