src: Fix inefficient usage of v8_inspector::StringView #52372
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Failed to start CI- Validating Jenkins credentials ✘ Jenkins credentials invalidhttps://github.com/nodejs/node/actions/runs/8605010252 |
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@addaleax Anything I need to address from my side for the failed CI run? |
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I'm not too familiar with the node CI. Are the failing tests from the two CI runs generally known to be flaky or should I investigate? |
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v8_inspector::StringView can either be one-byte or two-byte strings. Node has currently two places where it's unconditionally assumed that it's a two-byte StringView. This requires the upstream V8 inspector to unnecessarily create a copy of the string: https://source.chromium.org/chromium/chromium/src/+/main:v8/src/inspector/v8-inspector-session-impl.cc;l=192-199;drc=05bacd38e7a31e92afe0fd66081dfa2cc03b934a This is particularly slow, especially for large CDP messages, as the serialized JSON is iterated 8-bit char by 8-bit char and each one widened to a 16-bit char. This PR introduces a small helper that correctly converts a StringView to a v8::String instance honoring the "is8Bit" flag. This allows upstream V8 to remove the unnecessary widening copy.
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Rebased the PR after #51783 has landed. FYI @joyeecheung |
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v8_inspector::StringView can either be one-byte or two-byte strings. Node has currently two places where it's unconditionally assumed that it's a two-byte StringView.
This requires the upstream V8 inspector to unnecessarily create a copy of the string:
https://source.chromium.org/chromium/chromium/src/+/main:v8/src/inspector/v8-inspector-session-impl.cc;l=192-199;drc=05bacd38e7a31e92afe0fd66081dfa2cc03b934a
This is particularly slow, especially for large CDP messages, as the serialized JSON is iterated 8-bit char by 8-bit char and each one widened to a 16-bit char.
This PR introduces a small helper that correctly converts a StringView to a v8::String instance honoring the "is8Bit" flag. This allows upstream V8 to remove the unnecessary widening copy.
Tested locally with removing the widening copy in v8-inspector-session-impl.cc: Without the PR lots of tests will fail. But I'm happy to add unit tests for the
JSBindingsConnection/V8ProfilerConnectionif desired.