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<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav> <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading open"><span>Wiki</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><section class="sidebar-group is-sub-group depth-1"><p class="sidebar-heading"><span>Getting Started</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/INSTALL.html" class="sidebar-link">Installing the launcher</a></li><li><a href="/BUILD-FROM-SOURCE.html" class="sidebar-link">Building from source</a></li><li><a href="/SIGN-IN.html" class="sidebar-link">Signing in</a></li><li><a href="/INSTALL-MC.html" class="sidebar-link">Downloading a copy of Minecraft</a></li><li><a href="/DEFAULT-CONTROLS.html" class="sidebar-link">Taking a look at the controls</a></li></ul></section></li><li><section class="sidebar-group collapsable is-sub-group depth-1"><p class="sidebar-heading open"><span>Frequently Asked Questions</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><section class="sidebar-group collapsable is-sub-group depth-2"><p class="sidebar-heading open"><span>iOS-specific</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/JETSAM.html" class="sidebar-link">Dealing with iOS memory limits</a></li><li><a href="/JIT.html" aria-current="page" class="active sidebar-link">iOS and "JIT"</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header"><a href="/JIT.html#what-is-jit-and-why-do-i-care" class="sidebar-link">What is JIT and why do I care?</a></li><li class="sidebar-sub-header"><a href="/JIT.html#what-does-this-mean-for-pojavlauncher" class="sidebar-link">What does this mean for PojavLauncher?</a></li></ul></li></ul></section></li><li><section class="sidebar-group collapsable is-sub-group depth-2"><p class="sidebar-heading"><span>Android-specific</span> <span class="arrow right"></span></p> <!----></section></li></ul></section></li><li><section class="sidebar-group collapsable is-sub-group depth-1"><p class="sidebar-heading"><span>Going further</span> <span class="arrow right"></span></p> <!----></section></li></ul></section></li><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>About PojavLauncher</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/LEGAL.html" class="sidebar-link">Is PojavLauncher legal and safe to use?</a></li><li><a href="/DEVICES.html" class="sidebar-link">Device requirements</a></li><li><a href="/MCVERS.html" class="sidebar-link">Supported Minecraft versions</a></li><li><a href="/MODS-UNSUPPORTED.html" class="sidebar-link">Unsupported Mods and Clients</a></li><li><a href="/ROADMAP.html" class="sidebar-link">The road ahead for PojavLauncher</a></li></ul></section></li><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>Contributing</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/CONT-POJAV.html" class="sidebar-link">Contributing to PojavLauncher itself</a></li><li><a href="/CONT-WEBSITE.html" class="sidebar-link">Contributing to this website</a></li><li><a href="/CONT-TRANSLATIONS.html" class="sidebar-link">Contributing to the translation of PojavLauncher</a></li></ul></section></li><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>Recent Updates</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/UNJAIL.html" class="sidebar-link">Bringing PojavLauncher to unjailbroken iOS</a></li><li><a href="/IOS-SUPPORT.html" class="sidebar-link">System support in future versions of PojavLauncher iOS</a></li><li><a href="/LOCAL-MODE.html" class="sidebar-link">Offline mode is going places.</a></li></ul></section></li></ul> </aside> <main class="page"> <div class="theme-succinct-content content__default"><h1 id="ios-and-jit"><a href="#ios-and-jit" class="header-anchor">#</a> iOS and "JIT"</h1> <h2 id="what-is-jit-and-why-do-i-care"><a href="#what-is-jit-and-why-do-i-care" class="header-anchor">#</a> What is JIT and why do I care?</h2> <p>JIT stands for <strong>just-in-time compilation</strong>, and (although not specific to Java), it serves as a method of executing Java code quicker then the alternatives, by compiling as-needed functions at runtime, rather than its slower alternatives to compile all code at runtime repeatedly or writing in a less portable, hardware-level format. It is the fastest method to running Minecraft: Java Edition on mobile devices, essentially required for a usable experience.</p> <p>On Apple's mobile platforms (iOS, iPadOS, tvOS, in our case), a security feature known as <strong>code-signing</strong> is deeply rooted in the operation of the system. It serves to verify that applications haven't been tampered with after they were installed by a user, so that a malicious payload cannot be installed after-the-fact by a malicious someone. However, due to the process in which code-signing works, this prevents JIT from working properly as it works by reading code, modifying it, and then executing it in some fashion (whether that be by copying the code to a new location in memory, executing directly, or mirroring).</p> <h2 id="what-does-this-mean-for-pojavlauncher"><a href="#what-does-this-mean-for-pojavlauncher" class="header-anchor">#</a> What does this mean for PojavLauncher?</h2> <h3 id="jailbroken-devices"><a href="#jailbroken-devices" class="header-anchor">#</a> Jailbroken devices</h3> <p>Jailbroken device users don't need to worry about JIT requirements, as PojavLauncher is built to detect jailbreaks and automatically enable new features.</p> <h3 id="unjailbroken-devices"><a href="#unjailbroken-devices" class="header-anchor">#</a> Unjailbroken devices</h3> <p>Unjailbroken users can see two different outcomes, based on what they used to sideload PojavLauncher.</p> <h4 id="trollstore"><a href="#trollstore" class="header-anchor">#</a> TrollStore</h4> <p>If you used TrollStore to sideload PojavLauncher, good news: PojavLauncher takes advantage of the extended capabilities with TrollStore and automatically enables JIT when launched.</p> <h4 id="normal-sideload"><a href="#normal-sideload" class="header-anchor">#</a> Normal sideload</h4> <p>If you sideload normally, you will need to enable JIT in some way. The most common method is to attach a debug server to the application while it's running - JITStreamer, AltStore, and Jitterbug all use this with their Jit enabling functions. The only downside to this method is that you are required to be connected to a WiFi network in order to enable JIT.</p> <p>PojavLauncher has native integration with JITStreamer, and we recommend following the steps available <a href="https://jitstreamer.com/?slide=home" target="_blank" rel="noopener noreferrer">here<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a> to get started. Alternatively, you can use <a href="https://faq.altstore.io/how-to-use-altstore/altjit" target="_blank" rel="noopener noreferrer">AltStore<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a> or, for more advanced users, <a href="https://github.com/osy/Jitterbug/tree/main/Jitterbug" target="_blank" rel="noopener noreferrer">Jitterbug<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a>. Methods not listed here are not confirmed or recommended by us for use with PojavLauncher.</p></div> <footer class="page-edit"><div class="edit-link"><a href="https://github.com/PojavLauncherTeam/PojavLauncherTeam.github.io/edit/main/JIT.md" target="_blank" rel="noopener noreferrer">Help us improve this page!</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <div class="last-updated"><span class="prefix">Last Updated:</span> <span class="time">10/24/2022, 1:21:10 PM</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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