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ee781b71b4
Vendors the [blink perf tests](https://chromium.googlesource.com/chromium/src/+/HEAD/third_party/blink/perf_tests/). These perf tests are useful to evaluate the performance of servo. The license that governs the perf tests is included in the folder. Running benchmark cases automatically is left to future work. The update.py script is taken from mozjs and slightly adapted, so we can easily filter (and patch if this should be necessary in the future. Testing: This PR just adds the perf_tests, but does not use or modify them in any way. --------- Signed-off-by: Jonathan Schwender <schwenderjonathan@gmail.com>
48 lines
1.5 KiB
HTML
Vendored
48 lines
1.5 KiB
HTML
Vendored
<!DOCTYPE html>
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<script src="../resources/runner.js"></script>
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<script src="./resources/utils.js"></script>
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<script>
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const DECLARATIONS = 400;
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const TRAILING_TOKENS_PER_DECLARATION = 1000;
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// Makes many (invalid) width-declarations where {} appears at the start of
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// the the value, with lots of trailing tokens after.
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function makeStyle() {
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let rules = [];
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for (let i = 0; i < DECLARATIONS; i++) {
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// Note: The '$$$' is there to ensure that we back out of selector
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// parsing early. Without that, we'd parse a valid selector out of
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// 'foo0 foo1 foo2 ... fooN' (consisting of 1000 compounds),
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// and that is not the situation we're worried about the most.
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// We primarily care about high performance in the far more likely
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// scenario that we discover an invalid selector early on.
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rules.push(`width: {} $$$
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${[...Array(TRAILING_TOKENS_PER_DECLARATION).keys()]
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.map(x => `foo${x}`).join(' ')}
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;`);
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}
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return `
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div {
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${rules.join('\n')}
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}
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`
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}
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let globalCounter = 0;
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const stylesheetText = makeStyle();
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let stylesheet = new CSSStyleSheet();
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PerfTestRunner.measureTime({
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description: 'Many invalid width declarations with braces at the start',
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run: () => {
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// This is a parsing test: we don't care about style recalc.
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// We append a rule based on globalCounter to prevent caching
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// on the stylesheet string.
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stylesheet.replaceSync(stylesheetText + `\n .b${globalCounter++} {}`);
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}
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});
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</script>
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