[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
diff --git a/src/demangle/Utility.h b/src/demangle/Utility.h
index 846a5f0..bb073ae 100644
--- a/src/demangle/Utility.h
+++ b/src/demangle/Utility.h
@@ -126,6 +126,16 @@
return this->operator<<(static_cast<unsigned long long>(N));
}
+ void insert(size_t Pos, const char *S, size_t N) {
+ assert(Pos <= CurrentPosition);
+ if (N == 0)
+ return;
+ grow(N);
+ std::memmove(Buffer + Pos + N, Buffer + Pos, CurrentPosition - Pos);
+ std::memcpy(Buffer + Pos, S, N);
+ CurrentPosition += N;
+ }
+
size_t getCurrentPosition() const { return CurrentPosition; }
void setCurrentPosition(size_t NewPos) { CurrentPosition = NewPos; }
