1 files changed, 75 insertions, 0 deletions
diff --git a/components/script/init.rs b/components/script/init.rs
new file mode 100644
index 00000000000..8fd59592f01
--- /dev/null
+++ b/components/script/init.rs
@@ -0,0 +1,75 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+use crate::dom::bindings::codegen::RegisterBindings;
+use crate::dom::bindings::conversions::is_dom_proxy;
+use crate::dom::bindings::proxyhandler;
+use crate::dom::bindings::utils::is_platform_object_static;
+use crate::script_runtime::JSEngineSetup;
+use js::jsapi::JSObject;
+
+#[cfg(target_os = "linux")]
+#[allow(unsafe_code)]
+fn perform_platform_specific_initialization() {
+    // 4096 is default max on many linux systems
+    const MAX_FILE_LIMIT: libc::rlim_t = 4096;
+
+    // Bump up our number of file descriptors to save us from impending doom caused by an onslaught
+    // of iframes.
+    unsafe {
+        let mut rlim = libc::rlimit {
+            rlim_cur: 0,
+            rlim_max: 0,
+        };
+        match libc::getrlimit(libc::RLIMIT_NOFILE, &mut rlim) {
+            0 => {
+                if rlim.rlim_cur >= MAX_FILE_LIMIT {
+                    // we have more than enough
+                    return;
+                }
+
+                rlim.rlim_cur = match rlim.rlim_max {
+                    libc::RLIM_INFINITY => MAX_FILE_LIMIT,
+                    _ => {
+                        if rlim.rlim_max < MAX_FILE_LIMIT {
+                            rlim.rlim_max
+                        } else {
+                            MAX_FILE_LIMIT
+                        }
+                    },
+                };
+                match libc::setrlimit(libc::RLIMIT_NOFILE, &rlim) {
+                    0 => (),
+                    _ => warn!("Failed to set file count limit"),
+                };
+            },
+            _ => warn!("Failed to get file count limit"),
+        };
+    }
+}
+
+#[cfg(not(target_os = "linux"))]
+fn perform_platform_specific_initialization() {}
+
+#[allow(unsafe_code)]
+unsafe extern "C" fn is_dom_object(obj: *mut JSObject) -> bool {
+    !obj.is_null() && (is_platform_object_static(obj) || is_dom_proxy(obj))
+}
+
+#[allow(unsafe_code)]
+pub fn init() -> JSEngineSetup {
+    unsafe {
+        proxyhandler::init();
+
+        // Create the global vtables used by the (generated) DOM
+        // bindings to implement JS proxies.
+        RegisterBindings::RegisterProxyHandlers();
+
+        js::glue::InitializeMemoryReporter(Some(is_dom_object));
+    }
+
+    perform_platform_specific_initialization();
+
+    JSEngineSetup::new()
+}