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c0e4adbd32
Source-Repo: https://github.com/servo/servo Source-Revision: a164176876bb6abccf729eb5d6334e3c22230103
30 lines
1.3 KiB
Rust
30 lines
1.3 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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//! Routines for handling measuring the memory usage of arbitrary DOM nodes.
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use dom::bindings::conversions::get_dom_class;
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use dom::bindings::reflector::Reflectable;
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use heapsize::{HeapSizeOf, heap_size_of};
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use std::os::raw::c_void;
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// This is equivalent to measuring a Box<T>, except that DOM objects lose their
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// associated box in order to stash their pointers in a reserved slot of their
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// JS reflector.
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#[allow(unsafe_code)]
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pub fn heap_size_of_self_and_children<T: Reflectable + HeapSizeOf>(obj: &T) -> usize {
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unsafe {
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let class = get_dom_class(obj.reflector().get_jsobject().get()).unwrap();
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(class.heap_size_of)(obj as *const T as *const c_void)
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}
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}
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/// Used by codegen to include the pointer to the `HeapSizeOf` implementation of each
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/// IDL interface. This way we don't have to find the most-derived interface of DOM
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/// objects by hand in code.
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#[allow(unsafe_code)]
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pub unsafe fn heap_size_of_raw_self_and_children<T: HeapSizeOf>(obj: *const c_void) -> usize {
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heap_size_of(obj) + (*(obj as *const T)).heap_size_of_children()
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}
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