The old way was for the JavaScript string literals to be pre-escaped.
This was cumbersome since each place that creates a JavaScript string
literal needs to make a decision about whether escaping is needed and
the kind of escaping (UTF8 or ASCII).
This change moves the responsibility for escaping into the js_ast printer.
The escaped text exists only while printing, which reduces the heap in a
large modular compile link scenario by 220MB, since the unescaped string
is in memory anyway.
There were three kinds of escaping - ASCII, UTF8, and 'legacy', if not
specified. This has been reduced to ASCII (default) and UTF8, chosen by
a printer option.
Change-Id: Ic57d8fb70a213d3518244f1a152cd33e54103259
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/200400
Commit-Queue: Stephen Adams <sra@google.com>
Reviewed-by: Mayank Patke <fishythefish@google.com>
Reviewed-by: Joshua Litt <joshualitt@google.com>
Stephen Adams