And there are often several variants of the same entity, each needing a different name (if you’ve ever seen “reabstraction thunk” in a Swift backtrace, you’ve seen an example). And all the types need to be qualified with a module name. That means not only the base name of a function, but also the argument labels, the parameter and return types, the generic constraints, the type it’s nested in, the kind of declaration, and a private identifier if it’s private or fileprivate. Mangling needs to produce a unique identifier for every possible (distinguishable, runtime-relevant) declaration you could write in a Swift program. I’ll raise a bug with the llvm guys if that’s breaking an agreed standard practice. Is there any mission goal for llvm to generally produce gcc compatible assembly language? I’m not sure what the applicable standards are here. Reading the gcc standards, even modern gcc might not like that as I’m not sure if the parentheses instead of quotes matches the gcc identifier standards. The mangling format seems to have changed in swift 4.1 or 4.2?Īlso, and this isn’t a swift issue, it’s llvm, the llvm ir looks like call “$s3AVR.” and llc seems to compile that to call ($s3AVR.) which is also breaking I think. (I’m using it to help with compatibility for people on older macs, my home compiles versions were breaking on 2013 Mac Pro’s but I’ll probably upgrade soon.) Technically I am pretty sure in modern gcc any identifier enclosed in double quotes is legitimate so it should work with modern swift name mangling.īut I think the version of avr-gcc I’m using from CrossPack, built in 2013 is maybe too old so it’s breaking. In order to do so I tried outputting assembly files then using avr-gcc to compile object files and looking at if they link, what is different to track down the bug. I’m trying to help track it down for the AVR llvm team. I think it’s probably a target specific bug in the AVR object file writer. However, since swift 5 I am getting obscure linker errors about overlapping sections when I go to link the elf file. Until now, I was indeed using llc to write AVR object files. This is possibly unlikely to end up in production on my platform. That will be good enough to start to move my experiment on. I don't need to batch rename files all that often, but when I do, I find that Name Mangler works well for my needs.Awesome. (The behavior differs if you launch a droplet when Name Mangler is already running check the help file for more details.) Once you've created a set of renaming rules, you can save them as a "droplet," which is basically a file that launches Name Mangler, activates your settings, acts on the files you've dragged to the droplet, then quits Name Mangler. ![]() It's quite powerful, though building advanced NCDL tasks isn't for the faint of heart. There's an Examples pop-up menu you can use with Advanced to see some sample queries, and the help file has more info on using NCDL. With NCDL, you can create your own rules with constants, variables, and functions. Using Advanced, you can construct your own replacement rules, using Name Mangler's name conversion description language (NCDL). The pre-defined change types will meet most of your needs, but for those times when you want to do more, the Advanced option offers a tremendous amount of power. Those conditions are shown on the right half of the window, and are based (obviously) on which type of renaming you've chosen from the drop-down menu. Next to each file is an example of how it will look when renamed, based on your chosen conditions. ![]() ![]() You can populate the list by drag-and-drop from the Finder, or by clicking a button to add the current Finder (or Path Finder) selection to the list. The left half of the Name Mangler window shows the list of files that you'll be modifying. There's one more option here, Advanced, that I'll discuss in a bit more detail later. Using a drop-down menu, you tell Name Mangler what you'd like it to do - find and replace, number sequentially, change case, set extension, add prefix/suffix, or remove/insert characters. One of my favorite tools is Name Mangler, which has a (relatively) intuitive interface, and some powerful renaming features. There are lots of utilities out there to help with batch file renaming, including Apple's own Automator, which includes some renaming actions. Name Mangler - A batch file renaming utility Jun 09, '08 05:52:00AM Contributed by: robg
0 Comments
Leave a Reply. |