"You can't use bitcode to recompile an ARM iOS app for x86_64 macOS" — hold my beer^WRed Bull [wherein I extract the bitcode from an arm64 iOS binary and recompile it as x86_64 and run it on macOS]pic.twitter.com/WsdSaxSQtm
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Let's go further! Let's take an iOS GUI app, compiled for arm64 with bitcode, extract the bitcode, recompile it for x86_64, and then run it through marzipanify to let it run on Marzipan. Why yes, this works too. Bitcode can recompile iOS apps for macOS that easilypic.twitter.com/RROu5Rp51s
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I might come back and try something more complex tomorrow, but I hope I’ve shown that bitcode absolutely could be a BFD re the next two big Apple transitions: iOS apps on the Mac, and macOS on ARM. It can both recompile iOS apps for x86 Macs, and recompile x86 Mac apps for ARM
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OK here's a bit more of an example app; input: arm64 iOS app, output x86_64 Marzipan app. Uses the bitcode in the ARM binary and recompiles it for Intelpic.twitter.com/pHAvKlRZ4b
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I’ll compose a blog post tomorrow with a little more detail, if I don’t get distracted first
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Is bitcode the same as the llvm IR?
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You’re telling me there won’t even be a checkbox in Xcode for this transition.
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That escalated quickly!
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So would this technique work to convert some arbitrary iOS app that I just grabbed from the App Store? I assume they’re thinned for download so no bitcode... but this thread is making me question all my assumptions
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To be fair, it didn’t used to work that way, but a lot of work went into LLVM to enable less-restricted retargeting.
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How does it handle the ABI differences in variadic functions? iOS's arm64 variadic ABI is rather unique.
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Seems to me there is a utility that could come out of this work, where iOS frameworks and apps can have simulator versions made relatively easily (as long as you’ve checked bitcode).
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It all sound good, but VM that run windows on top of MacOS? They will exist in a Marzipan and arm world?
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Uhh maybe I misunderstand (and it’s probably not worth it this close to dub dub) but could this allow marzipanification or random App Store apps?
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All I understood was, Let’s take some apple slices convert them to whole apples and run it through the oven so that you can get a blueberry pie.
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I sense a new 12” MacBook with an Ax CPU lurking in Cupertino ;)
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If this laptop is running a legacy-free macOS that will run only App Store apps, I bet money it won’t be branded a Mac
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When do you think we'll get the transition announcement? I had previously thought WWDC 19 but now thinking that's too soon. Next summer?
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This is just super impressive tech prowess. Genuine kudos
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