mirror of
https://github.com/nodejs/node.git
synced 2025-05-21 14:39:17 +00:00
e31f0a7d25
PR-URL: https://github.com/nodejs/node/pull/28918 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com>
41 lines
989 B
JavaScript
41 lines
989 B
JavaScript
// Copyright 2016 the V8 project authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file.
|
|
|
|
// Flags: --allow-natives-syntax
|
|
|
|
function c4(w, h) {
|
|
var size = w * h;
|
|
if (size < 0) size = 0;
|
|
return new Uint32Array(size);
|
|
}
|
|
|
|
for (var i = 0; i < 3; i++) {
|
|
// Computing -0 as the result makes the "size = w * h" multiplication IC
|
|
// go into double mode.
|
|
c4(0, -1);
|
|
}
|
|
// Optimize Uint32ConstructFromLength.
|
|
for (var i = 0; i < 1000; i++) c4(2, 2);
|
|
|
|
// This array will have a HeapNumber as its length:
|
|
var bomb = c4(2, 2);
|
|
|
|
function reader(o, i) {
|
|
// Dummy try-catch, so that TurboFan is used to optimize this.
|
|
try {
|
|
} catch (e) {
|
|
}
|
|
return o[i];
|
|
}
|
|
// Optimize reader!
|
|
;
|
|
%PrepareFunctionForOptimization(reader);
|
|
for (var i = 0; i < 3; i++) reader(bomb, 0);
|
|
%OptimizeFunctionOnNextCall(reader);
|
|
reader(bomb, 0);
|
|
|
|
for (var i = bomb.length; i < 100; i++) {
|
|
assertEquals(undefined, reader(bomb, i));
|
|
}
|