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#![cfg_attr(feature = "unstable", feature(hashmap_hasher))]
extern crate libc;
use libc::{c_void, size_t};
use std::borrow::Cow;
use std::cell::{Cell, RefCell};
use std::collections::{HashMap, LinkedList};
#[cfg(feature = "unstable")]
use std::collections::hash_state;
use std::hash::Hash;
use std::marker::PhantomData;
use std::mem::{size_of, transmute};
use std::net::{Ipv4Addr, Ipv6Addr};
use std::sync::Arc;
use std::rc::Rc;
extern {
fn je_malloc_usable_size(ptr: *const c_void) -> size_t;
}
pub fn heap_size_of(ptr: *const c_void) -> usize {
if ptr == 0x01 as *const c_void {
0
} else {
unsafe { je_malloc_usable_size(ptr) as usize }
}
}
pub trait HeapSizeOf {
fn heap_size_of_children(&self) -> usize;
}
impl<T: HeapSizeOf> HeapSizeOf for Box<T> {
fn heap_size_of_children(&self) -> usize {
heap_size_of(&**self as *const T as *const c_void) + (**self).heap_size_of_children()
}
}
impl HeapSizeOf for String {
fn heap_size_of_children(&self) -> usize {
heap_size_of(self.as_ptr() as *const c_void)
}
}
impl<T: HeapSizeOf> HeapSizeOf for Option<T> {
fn heap_size_of_children(&self) -> usize {
match *self {
None => 0,
Some(ref x) => x.heap_size_of_children()
}
}
}
impl<'a, B: ?Sized + ToOwned> HeapSizeOf for Cow<'a, B> where B::Owned: HeapSizeOf {
fn heap_size_of_children(&self) -> usize {
match *self {
Cow::Borrowed(_) => 0,
Cow::Owned(ref b) => b.heap_size_of_children(),
}
}
}
impl<T: HeapSizeOf, U: HeapSizeOf> HeapSizeOf for (T, U) {
fn heap_size_of_children(&self) -> usize {
self.0.heap_size_of_children() + self.1.heap_size_of_children()
}
}
impl<T: HeapSizeOf> HeapSizeOf for Arc<T> {
fn heap_size_of_children(&self) -> usize {
(**self).heap_size_of_children()
}
}
impl<T: HeapSizeOf> HeapSizeOf for RefCell<T> {
fn heap_size_of_children(&self) -> usize {
self.borrow().heap_size_of_children()
}
}
impl<T: HeapSizeOf + Copy> HeapSizeOf for Cell<T> {
fn heap_size_of_children(&self) -> usize {
self.get().heap_size_of_children()
}
}
impl<T: HeapSizeOf> HeapSizeOf for Vec<T> {
fn heap_size_of_children(&self) -> usize {
heap_size_of(self.as_ptr() as *const c_void) +
self.iter().fold(0, |n, elem| n + elem.heap_size_of_children())
}
}
impl<T> HeapSizeOf for Vec<Rc<T>> {
fn heap_size_of_children(&self) -> usize {
heap_size_of(self.as_ptr() as *const c_void)
}
}
#[cfg(feature = "unstable")]
impl<K: HeapSizeOf, V: HeapSizeOf, S> HeapSizeOf for HashMap<K, V, S>
where K: Eq + Hash, S: hash_state::HashState {
fn heap_size_of_children(&self) -> usize {
let size = self.capacity() * (size_of::<V>() + size_of::<K>());
self.iter().fold(size, |n, (key, value)| {
n + key.heap_size_of_children() + value.heap_size_of_children()
})
}
}
#[cfg(not(feature = "unstable"))]
impl<K: HeapSizeOf, V: HeapSizeOf> HeapSizeOf for HashMap<K, V>
where K: Eq + Hash {
fn heap_size_of_children(&self) -> usize {
let size = self.capacity() * (size_of::<V>() + size_of::<K>());
self.iter().fold(size, |n, (key, value)| {
n + key.heap_size_of_children() + value.heap_size_of_children()
})
}
}
impl<T: HeapSizeOf> HeapSizeOf for LinkedList<T> {
fn heap_size_of_children(&self) -> usize {
let list2: &LinkedList2<T> = unsafe { transmute(self) };
list2.heap_size_of_children()
}
}
struct LinkedList2<T> {
_length: usize,
list_head: Link<T>,
_list_tail: Rawlink<Node<T>>,
}
type Link<T> = Option<Box<Node<T>>>;
struct Rawlink<T> {
_p: *mut T,
}
struct Node<T> {
next: Link<T>,
_prev: Rawlink<Node<T>>,
value: T,
}
impl<T: HeapSizeOf> HeapSizeOf for Node<T> {
fn heap_size_of_children(&self) -> usize {
self.value.heap_size_of_children()
}
}
impl<T: HeapSizeOf> HeapSizeOf for LinkedList2<T> {
fn heap_size_of_children(&self) -> usize {
let mut size = 0;
let mut curr: &Link<T> = &self.list_head;
while curr.is_some() {
size += (*curr).heap_size_of_children();
curr = &curr.as_ref().unwrap().next;
}
size
}
}
#[allow(dead_code)]
#[test]
#[should_panic]
fn linked_list2_check() {
unsafe {
transmute::<LinkedList<i32>, LinkedList2<i32>>(panic!());
}
}
impl<T> Drop for LinkedList2<T> {
fn drop(&mut self) {}
}
#[macro_export]
macro_rules! known_heap_size(
($size:expr, $($ty:ident),+) => (
$(
impl $crate::HeapSizeOf for $ty {
#[inline(always)]
fn heap_size_of_children(&self) -> usize {
$size
}
}
)+
);
($size: expr, $($ty:ident<$($gen:ident),+>),+) => (
$(
impl<$($gen: $crate::HeapSizeOf),+> $crate::HeapSizeOf for $ty<$($gen),+> {
#[inline(always)]
fn heap_size_of_children(&self) -> usize {
$size
}
}
)+
);
);
known_heap_size!(0, u8, u16, u32, u64, usize);
known_heap_size!(0, i8, i16, i32, i64, isize);
known_heap_size!(0, bool, f32, f64);
known_heap_size!(0, Ipv4Addr, Ipv6Addr);
known_heap_size!(0, PhantomData<T>);