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01e75646a5
This location type represents a contiguous range inside a file. It is effectively a pair of FileLineCols. Add new type and make FileLineCol a view for case where it matches existing previous one. The location includes filename and optional start line & col, and end line & col. Considered common cases are file:line, file:line:col, file:line:start_col to file:line:end_col and general range within same file. In memory its encoded as trailing objects. This keeps the memory requirement the same as FileLineColLoc today (makes the rather common File:Line cheaper) at the expense of extra work at decoding time. Kept the unsigned type. There was the option to always have file range be castable to FileLineColLoc. This cast would just drop other fields. That may result in some simpler staging. TBD. This is a rather minimal change, it does not yet add bindings (C or Python), lowering to LLVM debug locations etc. that supports end line:cols. --------- Co-authored-by: River Riddle <riddleriver@gmail.com>