Comment on Apple will start allowing emulators on the iOS App Store

kadu@lemmy.world ⁨2⁩ ⁨months⁩ ago

• nave@lemmy.ca ⁨2⁩ ⁨months⁩ ago

  you only get JIT by paying for a special developer license or using exploits on very specific iOS versions.

  Actually Altstore has Altjit which works on all iOS versions altstore supports but requires you to be connected to the same network as a computer running altstore.

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  • kadu@lemmy.world ⁨2⁩ ⁨months⁩ ago

    but requires you to be connected to the same network as a computer running altstore.

    So you mean iOS doesn’t natively support JIT for App Store apps and require hacky workarounds?

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    • WolfLink@lemmy.ml ⁨2⁩ ⁨months⁩ ago

      iOS natively supports JIT (by which we mean writable and executable memory) but Apple locks it down to only two use cases:

      1. The JavaScript engine in Safari
      2. Support for running a debugger

      AltStore launches a debugger and connects it to your phone. Even though it’s not actually doing anything with a debugger, that’s enough to convince iOS to let your app use memory that’s both writable and executable (the key feature needed for JIT).

      Without JIT you need to either resort to a slower form of emulation or do something creative.

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      • kadu@lemmy.world ⁨2⁩ ⁨months⁩ ago

        [deleted]

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    • nave@lemmy.ca ⁨2⁩ ⁨months⁩ ago

      I was just pointing out that OPs list was incomplete. Also theoretically someone could include altjit in their app because the App Store guidelines don’t explicitly say you can’t.

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  • tsonfeir@lemm.ee ⁨2⁩ ⁨months⁩ ago

    Sadly jail breaking is required after iOS 11

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    • nave@lemmy.ca ⁨2⁩ ⁨months⁩ ago

      For what?

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      • tsonfeir@lemm.ee ⁨2⁩ ⁨months⁩ ago

        For for UTM

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• Lojcs@lemm.ee ⁨2⁩ ⁨months⁩ ago

  which is why there are no browsers other than Safari

  Want that explicitly forbidden? Browsers don’t need jit to be fast enough

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  • echo64@lemmy.world ⁨2⁩ ⁨months⁩ ago

    Yes, op is a little confused.

    • Browsers (were, still are in many regions) forbidden from using any engine other than the iOS provided webkit.
    • Dynamic recompilation is not possible on iOS because of how iOS does code signing. This basically blocks the entire concept of executing instructions that weren’t part of the original signed code.

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• pivot_root@lemmy.world ⁨2⁩ ⁨months⁩ ago

  The GameCube also needs a JIT for decent performance. On a phone, that will especially hurt to emulate the CPU in software.

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