commit | e2df05ed6bd0efac7d52b22f2db1fc50e4f8fade | [log] [tgz] |
---|---|---|
author | Stephen Adams <sra@google.com> | Sat Jun 18 05:12:39 2022 +0000 |
committer | Commit Bot <commit-bot@chromium.org> | Sat Jun 18 05:12:39 2022 +0000 |
tree | ca6e540a60fe8056a53fb83f120d717b50a7f880 | |
parent | cb5c93d2da3cf385ee35d7dca33199f9d5e96ddf [diff] |
[dart2js] Take care not to split surrogate pairs when writing output dart2js chunks the writing of the JavaScript file. With `--utf8`, the output can contain code points that are represented as two surrogate pairs code units in the UTF-16 string. If the chunking splits the the surrogate pair then the lower level UTF8 encoding does not see the other element of the pair, so encodes the illegal unpaired surrogate as U+FFFD � (REPLACEMENT CHARACTER). The code point U+10000 ("𐀀") is encoded as the surrogate pair U+D800 followed by U+DC00, which normally is emitted as the UTF8 bytes ... F0 90 80 80 ... If split, each surrogate is converted to U+FFFD, resulting in bytes ... EF BF BD EF BF BD ... This change avoids splitting the surrogate pair by adjusting the index at which the string is split. Change-Id: I9629bf07d391005934c99d1dd649c55c4c58c3bc Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/249066 Reviewed-by: Mayank Patke <fishythefish@google.com> Commit-Queue: Stephen Adams <sra@google.com> Reviewed-by: Joshua Litt <joshualitt@google.com>
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