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Test Info: Warnings
- This test gets skipped with pattern: tsan
- Manifest: tools/profiler/tests/browser/browser.toml
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/**
* Test that JS sources with identical content get deduplicated.
* This test verifies that the profiler uses hash-based UUIDs for sources,
* enabling deduplication when the same source is loaded multiple times.
*/
add_task(async function test_js_sources_deduplication() {
Assert.ok(
!Services.profiler.IsActive(),
"The profiler is not currently active"
);
const url = BASE_URL + "simple.html";
await BrowserTestUtils.withNewTab(url, async contentBrowser => {
const contentPid = await SpecialPowers.spawn(contentBrowser, [], () => {
return Services.appinfo.processID;
});
await ProfilerTestUtils.startProfiler({ features: ["js", "jssources"] });
// Load the same script file multiple times.
// This simulates what happens when the same source is loaded in multiple contexts.
await SpecialPowers.spawn(contentBrowser, [], async () => {
// Dynamically inject the same script multiple times.
const loadScript = () => {
return new Promise((resolve, reject) => {
const script = content.document.createElement("script");
script.src = "test_dedup_script.js";
script.onload = resolve;
script.onerror = reject;
content.document.head.appendChild(script);
});
};
for (let i = 0; i < 10; i++) {
await loadScript();
}
});
const { contentProcess } = await stopProfilerNowAndGetThreads(contentPid);
Assert.ok(contentProcess.sources, "Profile should have sources table");
Assert.ok(contentProcess.sources.data, "Sources should have data");
const sourceFilenameCol = contentProcess.sources.schema.filename;
info(`Total sources: ${contentProcess.sources.data.length}`);
// Look for the test script.
let testScriptCount = 0;
for (const sourceEntry of contentProcess.sources.data) {
const filename = sourceEntry[sourceFilenameCol];
if (filename && filename.includes("test_dedup_script.js")) {
testScriptCount++;
}
}
// Should have exactly one entry for test_dedup_script.js despite loading it multiple times.
Assert.equal(
testScriptCount,
1,
"Should have exactly one deduplicated entry for test_dedup_script.js"
);
});
});