llvm-project

020fa868 - [NVPTX] mangle symbols in debug info to conform to PTX restrictions. (#113216)

[NVPTX] mangle symbols in debug info to conform to PTX restrictions. (#113216) Until now debug info was printing the symbols names as-is and that resulted in invalid PTX when the symbols contained characters that are invalid for PTX. E.g. `__PRETTY_FUNCTION.something` Debug info is somewhat disconnected from the symbols themselves, so the regular "NVPTXAssignValidGlobalNames" pass can't easily fix them. As the "plan B" this patch catches printout of debug symbols and fixes them, as needed. One gotcha is that the same code path is used to print the names of debug info sections. Those section names do start with a '.debug'. The dot in those names is nominally illegal in PTX, but the debug section names with a dot are accepted as a special case. The downside of this change is that if someone ever has a `.debug*` symbol that needs to be referred to from the debug info, that label will be passed through as-is, and will still produce broken PTX output. If/when we run into a case where we need it to work, we could consider only passing through specific debug section names, or add a mechanism allowing us to tell section names apart from regular symbols. Fixes #58491