llvm-project

889dad7f - [ItaniumDemangle] Add customizable printLeft/printRight APIs to OutputBuffer (#133249)

[ItaniumDemangle] Add customizable printLeft/printRight APIs to OutputBuffer (#133249) This patch includes the necessary changes for the LLDB feature proposed in https://discourse.llvm.org/t/rfc-lldb-highlighting-function-names-in-lldb-backtraces/85309. The TL;DR is that we want to track where certain parts of a demangled name begin/end so we can highlight them in backtraces. We introduce a new `printLeft`/`printRight` API on `OutputBuffer` that a client (in our case LLDB) can implement to track state while printing the demangle tree. This requires redirecting all calls to to `printLeft`/`printRight` to the `OutputBuffer`. One quirk with the new API is that `Utility.h` would now depend on `ItaniumDemangle.h` and vice-versa. To keep these files header-only I made the definitions `inline` and implement the new APIs in `ItaniumDemangle.h` (so the definition of `Node` is available to them). Also introduces `notifyInsertion`/`notifyDeletion` APIs that a client can override to respond to cases where the `OutputBuffer` changes arbitrary parts of the name.