Function gjs_create_js_context

gjs/engine.cpp:197–259

};

JSContext* gjs_create_js_context(GjsContextPrivate* uninitialized_gjs) {
    g_assert(gjs_is_inited);
    JSContext* cx = JS_NewContext(/* max bytes = */ 32 * 1024 * 1024);
    if (!cx)
        return nullptr;

    if (!JS::InitSelfHostedCode(cx)) {
        JS_DestroyContext(cx);
        return nullptr;
    }

    // For additional context on these options, see
    // https://searchfox.org/mozilla-esr91/rev/c49725508e97c1e2e2bb3bf9ed0ba14b2016abac/js/public/GCAPI.h#53
    JS_SetNativeStackQuota(cx, 1024UL * 1024UL);
    JS_SetGCParameter(cx, JSGC_MAX_BYTES, -1);
    JS_SetGCParameter(cx, JSGC_INCREMENTAL_GC_ENABLED, 1);
    JS_SetGCParameter(cx, JSGC_SLICE_TIME_BUDGET_MS, 10);

    // set ourselves as the private data
    JS_SetContextPrivate(cx, uninitialized_gjs);

    JS_SetSecurityCallbacks(cx, &security_callbacks);
    JS_InitDestroyPrincipalsCallback(cx, &ModuleLoaderPrincipals::destroy);
    JS_AddFinalizeCallback(cx, gjs_finalize_callback, uninitialized_gjs);
    JS::SetWarningReporter(cx, gjs_warning_reporter);
    JS::SetJobQueue(cx, dynamic_cast<JS::JobQueue*>(uninitialized_gjs));
    JS::SetPromiseRejectionTrackerCallback(cx, on_promise_unhandled_rejection,
                                           uninitialized_gjs);
    JS::SetHostCleanupFinalizationRegistryCallback(
        cx, on_cleanup_finalization_registry, uninitialized_gjs);
    js::SetDOMCallbacks(cx, &dom_callbacks);

    // We use this to handle "lazy sources" that SpiderMonkey doesn't need to
    // keep in memory. Most sources should be kept in memory, but we can skip
    // doing that for the realm bootstrap code, as it is already in memory in
    // the form of a GResource. Instead we use the "source hook" to retrieve it.
    auto hook = mozilla::MakeUnique<GjsSourceHook>();
    js::SetSourceHook(cx, std::move(hook));

    if (g_getenv("GJS_DISABLE_EXTRA_WARNINGS")) {
        g_warning(
            "GJS_DISABLE_EXTRA_WARNINGS has been removed, GJS no longer logs "
            "extra warnings.");
    }

    bool enable_jit = !(g_getenv("GJS_DISABLE_JIT"));
    if (enable_jit) {
        gjs_debug(GJS_DEBUG_CONTEXT, "Enabling JIT");
    }
    JS::ContextOptionsRef(cx).setAsmJS(enable_jit);

    uint32_t value = enable_jit ? 1 : 0;

    JS_SetGlobalJitCompilerOption(
        cx, JSJitCompilerOption::JSJITCOMPILER_ION_ENABLE, value);
    JS_SetGlobalJitCompilerOption(
        cx, JSJitCompilerOption::JSJITCOMPILER_BASELINE_ENABLE, value);
    JS_SetGlobalJitCompilerOption(