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BEAM-on-device mobile framework for Elixir

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mob ios mob_beam.m
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ios/mob_beam.m 

// mob_beam.m — Mob BEAM launcher for iOS.

// Extracted from the per-app beam_main.m stub so app code stays minimal.

// mob_set_startup_phase/error are implemented in mob_nif.m (which imports the

// Swift-generated header) so this file stays free of app-specific includes.



#import <Foundation/Foundation.h>

#include <stdlib.h>

#include <string.h>

#include "mob_beam.h"



#define OTP_ROOT   "/tmp/otp-ios-sim"

#define ERTS_VSN   "erts-16.3"

#define ELIXIR_DIR OTP_ROOT "/lib/elixir/ebin"

#define LOGGER_DIR OTP_ROOT "/lib/logger/ebin"



void mob_init_ui(void) {

    // SwiftUI: the UI is driven by MobViewModel (Swift ObservableObject).

    // No UIViewController reference needed here; the hosting controller is

    // created by MobUIFactory in AppDelegate.m.

    NSLog(@"[MobBeam] mob_init_ui: SwiftUI mode ready");

}



void mob_start_beam(const char* app_module) {

    mob_set_startup_phase("Setting up BEAM environment…");

    setenv("BINDIR",   OTP_ROOT "/" ERTS_VSN "/bin", 1);

    setenv("ROOTDIR",  OTP_ROOT, 1);

    setenv("PROGNAME", "erl", 1);

    setenv("EMU",      "beam", 1);

    setenv("HOME",     "/tmp", 1);

    // Set MOB_DATA_DIR to the app's Documents directory — persistent storage

    // accessible to the app and backed up by iCloud. Used by the generated Repo

    // module to determine where to place the SQLite database file.

    // Falls back to /tmp when the documents path is unavailable (e.g. on simulator

    // when the sandbox isn't fully resolved at BEAM launch time).

    NSArray *docs_paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    NSString *docs_dir = [docs_paths firstObject];

    setenv("MOB_DATA_DIR", docs_dir ? [docs_dir UTF8String] : "/tmp", 1);

    setenv("ERL_CRASH_DUMP", "/tmp/mob_erl_crash.dump", 1);

    setenv("ERL_CRASH_DUMP_SECONDS", "30", 1);



    // Read dist port from MOB_DIST_PORT env var (set by mob_dev via xcrun simctl launch --setenv).

    // Defaults to 9100 if not set (standalone launch without mob_dev).

    const char *env_port = getenv("MOB_DIST_PORT");

    static char dist_port_min[16], dist_port_max[16];

    snprintf(dist_port_min, sizeof(dist_port_min), "%s", env_port ? env_port : "9101");

    snprintf(dist_port_max, sizeof(dist_port_max), "%s", env_port ? env_port : "9101");



    // Build dynamic strings from app_module.

    char eval_expr[280];

    snprintf(eval_expr, sizeof(eval_expr), "%s:start().", app_module);



    char node_name[128];

    snprintf(node_name, sizeof(node_name), "%s_ios@127.0.0.1", app_module);



    char beams_dir[256];

    snprintf(beams_dir, sizeof(beams_dir), OTP_ROOT "/%s", app_module);

    // MOB_BEAMS_DIR — the directory where app BEAMs (and priv/) are deployed.

    //

    // Ecto.Migrator uses :code.priv_dir(app) to locate migration .exs files, but

    // that requires an OTP lib structure ($OTP_ROOT/lib/APP-VERSION/ebin/). Mob

    // apps use a flat -pa directory, so :code.priv_dir/1 returns {error, bad_name}

    // and Ecto silently reports "Migrations already up" without running anything.

    //

    // Fix: deployer.ex copies priv/ into beams_dir/priv/. App code reads this

    // env var and passes the explicit path to Ecto.Migrator.run/4. See also the

    // corresponding comment in mob_beam.c for the Android side.

    setenv("MOB_BEAMS_DIR", beams_dir, 1);



    const char* args[] = {

        "beam",

        "-S", "1:1", "-SDcpu", "1:1", "-SDio", "1", "-A", "1", "-sbwt", "none",

        // elixir-desktop added "-MIscs", "10" to cap the BEAM's memory super carrier at 10MB

        // after seeing "erts_mmap: Failed to create super carrier of size 1024 MB" on 9th gen iPads.

        // The default is 1GB virtual reservation which iOS silently rejects. Their fix is correct in

        // effect but may be masking wrong flags elsewhere — enable this if we see the same error.

        // "-MIscs", "10",

        "--",

        "-root",     OTP_ROOT,

        "-bindir",   OTP_ROOT "/" ERTS_VSN "/bin",

        "-progname", "erl",

        "--",

        "-name",     node_name,

        "-setcookie", "mob_secret",

        "-kernel", "inet_dist_listen_min", dist_port_min,

        "-kernel", "inet_dist_listen_max", dist_port_max,

        "-noshell", "-noinput",

        "-boot",   OTP_ROOT "/releases/29/start_clean",

        "-pa",     ELIXIR_DIR,

        "-pa",     LOGGER_DIR,

        "-pa",     beams_dir,

        "-eval",   eval_expr,

        NULL

    };

    int ac = 0;

    while (args[ac]) ac++;

    NSLog(@"[MobBeam] mob_start_beam: starting BEAM module=%s argc=%d", app_module, ac);

    mob_set_startup_phase("Starting BEAM…");



    void erl_start(int, char**);

    erl_start(ac, (char**)args);

    mob_set_startup_error("BEAM exited unexpectedly — check /tmp/mob_erl_crash.dump");

    NSLog(@"[MobBeam] mob_start_beam: erl_start returned (unexpected)");

}