[Demangle] Add prepend functionality to OutputString
Implement the functionallity of prepend, required by D demangler.
Please read discussion https://reviews.llvm.org/D111414 for context.
See also https://reviews.llvm.org/D111947 .
Reviewed By: dblaikie, Geod24
Differential Revision: https://reviews.llvm.org/D111948
GitOrigin-RevId: 2d77b272a8f9b5b89b022628ca30b6b896a8f725
diff --git a/src/demangle/Utility.h b/src/demangle/Utility.h
index 7f4d885..733d83a 100644
--- a/src/demangle/Utility.h
+++ b/src/demangle/Utility.h
@@ -95,6 +95,17 @@
OutputBuffer &operator<<(StringView R) { return (*this += R); }
+ OutputBuffer prepend(StringView R) {
+ size_t Size = R.size();
+
+ grow(Size);
+ std::memmove(Buffer + Size, Buffer, CurrentPosition);
+ std::memcpy(Buffer, R.begin(), Size);
+ CurrentPosition += Size;
+
+ return *this;
+ }
+
OutputBuffer &operator<<(char C) { return (*this += C); }
OutputBuffer &operator<<(long long N) {
