54 lines
1.7 KiB
JavaScript
54 lines
1.7 KiB
JavaScript
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// Copyright 2021 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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//
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// Flags: --harmony-struct --shared-string-table --allow-natives-syntax
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// Flags: --expose-gc
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if (this.Worker) {
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(function TestSharedStringPostMessage() {
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function workerCode() {
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let Box = new SharedStructType(['payload']);
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let b1 = new Box();
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b1.payload = "started";
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postMessage(b1);
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onmessage = function(box) {
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if (!%IsSharedString(box.payload)) {
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throw new Error("str isn't shared");
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}
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let b2 = new Box();
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b2.payload = box.payload;
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postMessage(b2);
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};
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}
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// Strings referenced in shared structs are serialized by sharing.
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let worker = new Worker(workerCode, { type: 'function' });
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let started = worker.getMessage();
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assertTrue(%IsSharedString(started.payload));
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assertEquals("started", started.payload);
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let Box = new SharedStructType(['payload']);
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let box_to_send = new Box();
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// Create a string in large object space.
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let payload = %FlattenString('a'.repeat(1024 * 256));
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assertTrue(%InLargeObjectSpace(payload));
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// Trigger a gc to move the object to old space.
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gc();
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assertFalse(%InYoungGeneration(payload));
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box_to_send.payload = payload;
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assertTrue(%IsSharedString(box_to_send.payload));
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worker.postMessage(box_to_send);
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let box_received = worker.getMessage();
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assertTrue(%IsSharedString(box_received.payload));
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assertFalse(box_to_send === box_received);
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// Object.is and === won't check pointer equality of Strings.
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assertTrue(%IsSameHeapObject(box_to_send.payload, box_received.payload));
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worker.terminate();
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})();
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}
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