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// Copyright 2021 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: --harmony-struct --shared-string-table --allow-natives-syntax
// Flags: --expose-gc
if (this.Worker) {
(function TestSharedStringPostMessage() {
function workerCode() {
let Box = new SharedStructType(['payload']);
let b1 = new Box();
b1.payload = "started";
postMessage(b1);
onmessage = function(box) {
if (!%IsSharedString(box.payload)) {
throw new Error("str isn't shared");
}
let b2 = new Box();
b2.payload = box.payload;
postMessage(b2);
};
}
// Strings referenced in shared structs are serialized by sharing.
let worker = new Worker(workerCode, { type: 'function' });
let started = worker.getMessage();
assertTrue(%IsSharedString(started.payload));
assertEquals("started", started.payload);
let Box = new SharedStructType(['payload']);
let box_to_send = new Box();
// Create a string that is not internalized by the parser. Create dummy
// strings before and after the string to make sure we have enough live
// objects on the page to get it promoted to old space (for minor MC).
let trash = [];
for (let i = 0; i < 1024 * 32; i++) {
trash.push('a'.repeat(8));
}
let payload = %FlattenString('a'.repeat(1024 * 60));
for (let i = 0; i < 1024 * 32; i++) {
trash.push('a'.repeat(8));
}
// Trigger a gc to move the object to old space.
gc({type: 'minor'});
assertFalse(%InLargeObjectSpace(payload));
assertFalse(%InYoungGeneration(payload));
box_to_send.payload = payload;
assertTrue(%IsSharedString(box_to_send.payload));
worker.postMessage(box_to_send);
let box_received = worker.getMessage();
assertTrue(%IsSharedString(box_received.payload));
assertFalse(box_to_send === box_received);
// Object.is and === won't check pointer equality of Strings.
assertTrue(%IsSameHeapObject(box_to_send.payload, box_received.payload));
worker.terminate();
})();
}
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