tree e83ef9f0a00f7bdaf2de358344a9f0a7a5cc664f
parent ce9a9b3f55b3dd4e169f089593175ba3eb750951
author Tomasz Miąsko <tomasz.miasko@gmail.com> 1633046400 +0000
committer Copybara-Service <copybara-worker@google.com> 1633119345 -0700

[Demangle][Rust] Parse non-ASCII identifiers

Rust allows use of non-ASCII identifiers, which in Rust mangling scheme
are encoded using Punycode.

The encoding deviates from the standard by using an underscore as the
separator between ASCII part and a base-36 encoding of non-ASCII
characters (avoiding hypen-minus in the symbol name). Other than that,
the encoding follows the standard, and the decoder implemented here in
turn follows the one given in RFC 3492.

To avoid an extra intermediate memory allocation while decoding
Punycode, the interface of OutputStream is extended with an insert
method.

Reviewed By: dblaikie

Differential Revision: https://reviews.llvm.org/D104366

GitOrigin-RevId: c8c2b4629f7597ac16102dab6150da14d68167de