Quelle 1907222_truncate_error.html Sprache: HTML

products/Sources/formale Sprachen/C/Firefox/dom/webgpu/crashtests/1907222_truncate_error.html

<!DOCTYPE html>
<html class="reftest-wait">
  <head>
    <meta charset="utf-8" />
    <script src="/tests/SimpleTest/SimpleTest.js"></script>
    <link rel="stylesheet" href="/tests/SimpleTest/test.css" />
  </head>
  <body>
    <script>
      // Ensure that, when WebGPU generates an error message that is later
      // truncated by `wgpu_bindings::error::ErrorBuffer::init`, that
      // truncation always produces valid UTF-8, even when the error contains
      // multi-byte encodings.
      async function truncate_error_messages() {
        // The specific error we'll try to provoke is submitting a command
        // buffer to the wrong device's queue.
        const adapter = await navigator.gpu.requestAdapter();
        const device1 = await adapter.requestDevice();
        const device2 = await adapter.requestDevice();

        // Try a range of label lengths (578±200, where 578 is the length that
        // tickles the original bug), searching for one that, when combined with
        // the error message and then truncated at whatever error message byte
        // length limit Firefox is imposing, will produce invalid UTF-8.
        //
        // Use a label containing n space characters followed by a crab emoji,
        // U+1F980, which requires four bytes to encode in UTF-8. Since this has
        // a four-byte encoding at the end, we only need to try every third
        // length to ensure we will always try a truncation point in the midst
        // of that encoding.
        for (let len = 378; len < 778; len += 3) {
          const label = ' '.repeat(len) + '\uD83E\uDD80';
          const encoder = device1.createCommandEncoder({ label });
          const command_buffer = encoder.finish();

          // We don't want an error scope around this, because what makes
          // Firefox notice the bad UTF-8 is attempting to log the uncaught
          // WebGPU error as a warning.
          device2.queue.submit([command_buffer]);
        }
      }

      truncate_error_messages()
        .catch(e => {
          console.log(e);
        })
        .finally(() => {
          // End the crashtest.
          document.documentElement.removeAttribute("class");
        });
    </script>
  </body>
</html>

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