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
Allow mangled names to include an arbitrary dot suffix, akin to vendor
specific suffix in Itanium mangling.
Primary motivation is a support for symbols renamed during ThinLTO
import / promotion (ThinLTO is the default configuration for optimized
builds in rustc).
Reviewed By: dblaikie
Differential Revision: https://reviews.llvm.org/D104358
Add a demangling support for a small subset of a new Rust mangling
scheme, with complete support planned as a follow up work.
Intergate Rust demangling into llvm-cxxfilt and use llvm-cxxfilt for
end-to-end testing. The new Rust mangling scheme uses "_R" as a prefix,
which makes it easy to disambiguate it from other mangling schemes.
The public API is modeled after __cxa_demangle / llvm::itaniumDemangle,
since potential candidates for further integration use those.
Reviewed By: dblaikie
Differential Revision: https://reviews.llvm.org/D101444
Tomasz Miąsko