cbd4f5aa98
This fixes broken dynamic hole-checks for the temporal dead zone of
non-initializing assignments to {let} and {const} declared variables.
Also note that this exemplifies a case where the dynamic check for such
assignments to {let} declared variables can no longer be elided as the
comment suggested.
R=rossberg@chromium.org
TEST=mjsunit/regress/regress-4388
BUG=v8:4388
LOG=n
Review URL: https://codereview.chromium.org/1318693002
Cr-Commit-Position: refs/heads/master@{#30375}
36 lines
1.2 KiB
JavaScript
36 lines
1.2 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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// Flags: --allow-natives-syntax --turbo-filter=test*
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// Tests that TurboFan emits a dynamic hole-check for the temporal dead zone at
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// a non-initializing assignments to a {let} variable.
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function test_hole_check_for_let(a) {
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'use strict';
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{ switch (a) {
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case 0: let x;
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case 1: x = 9;
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}
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}
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}
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assertDoesNotThrow("test_hole_check_for_let(0)");
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assertThrows("test_hole_check_for_let(1)", ReferenceError);
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%OptimizeFunctionOnNextCall(test_hole_check_for_let)
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assertThrows("test_hole_check_for_let(1)", ReferenceError);
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// Tests that TurboFan emits a dynamic hole-check for the temporal dead zone at
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// a non-initializing assignments to a {const} variable.
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function test_hole_check_for_const(a) {
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'use strict';
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{ switch (a) {
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case 0: const x = 3;
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case 1: x = 2;
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}
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}
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}
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assertThrows("test_hole_check_for_const(0)", TypeError);
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assertThrows("test_hole_check_for_const(1)", ReferenceError);
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%OptimizeFunctionOnNextCall(test_hole_check_for_const)
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assertThrows("test_hole_check_for_const(1)", ReferenceError);
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