53 lines
2.2 KiB
HTML
53 lines
2.2 KiB
HTML
<!DOCTYPE html>
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<html class="reftest-wait">
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<head>
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<meta charset="utf-8" />
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<script src="/tests/SimpleTest/SimpleTest.js"></script>
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<link rel="stylesheet" href="/tests/SimpleTest/test.css" />
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</head>
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<body>
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<script>
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// Ensure that, when WebGPU generates an error message that is later
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// truncated by `wgpu_bindings::error::ErrorBuffer::init`, that
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// truncation always produces valid UTF-8, even when the error contains
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// multi-byte encodings.
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async function truncate_error_messages() {
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// The specific error we'll try to provoke is submitting a command
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// buffer to the wrong device's queue.
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const adapter = await navigator.gpu.requestAdapter();
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const device1 = await adapter.requestDevice();
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const device2 = await adapter.requestDevice();
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// Try a range of label lengths (578±200, where 578 is the length that
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// tickles the original bug), searching for one that, when combined with
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// the error message and then truncated at whatever error message byte
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// length limit Firefox is imposing, will produce invalid UTF-8.
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//
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// Use a label containing n space characters followed by a crab emoji,
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// U+1F980, which requires four bytes to encode in UTF-8. Since this has
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// a four-byte encoding at the end, we only need to try every third
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// length to ensure we will always try a truncation point in the midst
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// of that encoding.
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for (let len = 378; len < 778; len += 3) {
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const label = ' '.repeat(len) + '\uD83E\uDD80';
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const encoder = device1.createCommandEncoder({ label });
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const command_buffer = encoder.finish();
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// We don't want an error scope around this, because what makes
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// Firefox notice the bad UTF-8 is attempting to log the uncaught
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// WebGPU error as a warning.
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device2.queue.submit([command_buffer]);
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}
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}
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truncate_error_messages()
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.catch(e => {
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console.log(e);
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})
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.finally(() => {
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// End the crashtest.
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document.documentElement.removeAttribute("class");
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});
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</script>
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</body>
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</html>
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