1 files changed, 20 insertions, 0 deletions
diff --git a/components/script_bindings/mem.rs b/components/script_bindings/mem.rs
new file mode 100644
index 00000000000..52a6e724b22
--- /dev/null
+++ b/components/script_bindings/mem.rs
@@ -0,0 +1,20 @@
+/* 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/. */
+
+//! Routines for handling measuring the memory usage of arbitrary DOM nodes.
+
+use std::os::raw::c_void;
+
+use malloc_size_of::{MallocSizeOf, MallocSizeOfOps};
+
+/// Used by codegen to include the pointer to the `MallocSizeOf` implementation of each
+/// IDL interface. This way we don't have to find the most-derived interface of DOM
+/// objects by hand in code.
+#[allow(unsafe_code)]
+pub(crate) unsafe fn malloc_size_of_including_raw_self<T: MallocSizeOf>(
+    ops: &mut MallocSizeOfOps,
+    obj: *const c_void,
+) -> usize {
+    ops.malloc_size_of(obj) + (*(obj as *const T)).size_of(ops)
+}