javascript-engine

the following poc cause a assertion failure in "debug" build on ubuntu.

function opt(){
	const v2 = [-1000000000.0];
	v2.length = 4294967295;
	const v3 = v2.copyWithin();
	return v3;
}


for(let i=0;i<0x200;i++){
	opt(false);
}

As Clippy warns, the RegExp structure in src/builtins/regexp/mod.rs has too many booleans (one for each flag). This is bad, because it might not get correctly optimised by the compiler. Ideally, we would want to use a bitflags structure such as the RegExpFlags one in https://github.com/boa-dev/boa/blob/60b7eb89340c2

The README recommends adding ~/.jsvu to the $PATH. If you look at its contents, however:

▲  ~/ ls ~/.jsvu
.               ..              engines         status.json     v8

you'll see that I get the v8 binary (good!), but also I'm exposing status.json and engines to my $PATH

▲  ~/ engines
zsh: permission denied: engines
▲  ~/ status.json
zsh: permission deni

right now, we have a bunch of warnings in Clippy. We could fix them gradually. And set up Clippy in Ci at last.

copy_dir is quite outdated and tends to introduce a duplicate dependency on walkdir.

We can either ship a compressed version of the code, which is then uncompressed instead of copying the source directory.
Or switch to a different dependency like fs-extra.

See libquickjs-sys/build.rs.