зеркало из https://github.com/mozilla/gecko-dev.git
436 строки
14 KiB
Rust
436 строки
14 KiB
Rust
// Copyright 2016-2017 The Servo Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! A reduced fork of Firefox's malloc_size_of crate, for bundling with WebRender.
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extern crate app_units;
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extern crate euclid;
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use std::hash::{BuildHasher, Hash};
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use std::mem::size_of;
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use std::ops::Range;
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use std::os::raw::c_void;
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/// A C function that takes a pointer to a heap allocation and returns its size.
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type VoidPtrToSizeFn = unsafe extern "C" fn(ptr: *const c_void) -> usize;
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/// Operations used when measuring heap usage of data structures.
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pub struct MallocSizeOfOps {
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/// A function that returns the size of a heap allocation.
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pub size_of_op: VoidPtrToSizeFn,
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/// Like `size_of_op`, but can take an interior pointer. Optional because
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/// not all allocators support this operation. If it's not provided, some
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/// memory measurements will actually be computed estimates rather than
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/// real and accurate measurements.
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pub enclosing_size_of_op: Option<VoidPtrToSizeFn>,
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}
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impl MallocSizeOfOps {
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pub fn new(
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size_of: VoidPtrToSizeFn,
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malloc_enclosing_size_of: Option<VoidPtrToSizeFn>,
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) -> Self {
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MallocSizeOfOps {
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size_of_op: size_of,
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enclosing_size_of_op: malloc_enclosing_size_of,
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}
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}
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/// Check if an allocation is empty. This relies on knowledge of how Rust
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/// handles empty allocations, which may change in the future.
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fn is_empty<T: ?Sized>(ptr: *const T) -> bool {
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// The correct condition is this:
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// `ptr as usize <= ::std::mem::align_of::<T>()`
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// But we can't call align_of() on a ?Sized T. So we approximate it
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// with the following. 256 is large enough that it should always be
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// larger than the required alignment, but small enough that it is
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// always in the first page of memory and therefore not a legitimate
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// address.
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return ptr as *const usize as usize <= 256;
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}
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/// Call `size_of_op` on `ptr`, first checking that the allocation isn't
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/// empty, because some types (such as `Vec`) utilize empty allocations.
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pub unsafe fn malloc_size_of<T: ?Sized>(&self, ptr: *const T) -> usize {
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if MallocSizeOfOps::is_empty(ptr) {
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0
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} else {
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(self.size_of_op)(ptr as *const c_void)
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}
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}
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/// Is an `enclosing_size_of_op` available?
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pub fn has_malloc_enclosing_size_of(&self) -> bool {
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self.enclosing_size_of_op.is_some()
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}
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/// Call `enclosing_size_of_op`, which must be available, on `ptr`, which
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/// must not be empty.
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pub unsafe fn malloc_enclosing_size_of<T>(&self, ptr: *const T) -> usize {
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assert!(!MallocSizeOfOps::is_empty(ptr));
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(self.enclosing_size_of_op.unwrap())(ptr as *const c_void)
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}
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}
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/// Trait for measuring the "deep" heap usage of a data structure. This is the
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/// most commonly-used of the traits.
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pub trait MallocSizeOf {
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/// Measure the heap usage of all descendant heap-allocated structures, but
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/// not the space taken up by the value itself.
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fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize;
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}
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/// Trait for measuring the "shallow" heap usage of a container.
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pub trait MallocShallowSizeOf {
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/// Measure the heap usage of immediate heap-allocated descendant
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/// structures, but not the space taken up by the value itself. Anything
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/// beyond the immediate descendants must be measured separately, using
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/// iteration.
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fn shallow_size_of(&self, ops: &mut MallocSizeOfOps) -> usize;
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}
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impl MallocSizeOf for String {
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fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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unsafe { ops.malloc_size_of(self.as_ptr()) }
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}
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}
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impl<T: ?Sized> MallocShallowSizeOf for Box<T> {
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fn shallow_size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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unsafe { ops.malloc_size_of(&**self) }
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}
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}
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impl<T: MallocSizeOf + ?Sized> MallocSizeOf for Box<T> {
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fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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self.shallow_size_of(ops) + (**self).size_of(ops)
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}
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}
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impl MallocSizeOf for () {
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fn size_of(&self, _ops: &mut MallocSizeOfOps) -> usize {
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0
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}
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}
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impl<T1, T2> MallocSizeOf for (T1, T2)
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where
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T1: MallocSizeOf,
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T2: MallocSizeOf,
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{
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fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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self.0.size_of(ops) + self.1.size_of(ops)
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}
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}
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impl<T1, T2, T3> MallocSizeOf for (T1, T2, T3)
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where
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T1: MallocSizeOf,
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T2: MallocSizeOf,
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T3: MallocSizeOf,
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{
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fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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self.0.size_of(ops) + self.1.size_of(ops) + self.2.size_of(ops)
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}
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}
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impl<T1, T2, T3, T4> MallocSizeOf for (T1, T2, T3, T4)
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where
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T1: MallocSizeOf,
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T2: MallocSizeOf,
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T3: MallocSizeOf,
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T4: MallocSizeOf,
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{
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fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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self.0.size_of(ops) + self.1.size_of(ops) + self.2.size_of(ops) + self.3.size_of(ops)
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}
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}
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impl<T: MallocSizeOf> MallocSizeOf for Option<T> {
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fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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if let Some(val) = self.as_ref() {
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val.size_of(ops)
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} else {
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0
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}
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}
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}
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impl<T: MallocSizeOf, E: MallocSizeOf> MallocSizeOf for Result<T, E> {
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fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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match *self {
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Ok(ref x) => x.size_of(ops),
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Err(ref e) => e.size_of(ops),
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}
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}
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}
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impl<T: MallocSizeOf + Copy> MallocSizeOf for std::cell::Cell<T> {
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fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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self.get().size_of(ops)
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}
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}
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impl<T: MallocSizeOf> MallocSizeOf for std::cell::RefCell<T> {
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fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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self.borrow().size_of(ops)
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}
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}
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impl<'a, B: ?Sized + ToOwned> MallocSizeOf for std::borrow::Cow<'a, B>
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where
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B::Owned: MallocSizeOf,
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{
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fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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match *self {
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std::borrow::Cow::Borrowed(_) => 0,
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std::borrow::Cow::Owned(ref b) => b.size_of(ops),
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}
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}
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}
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impl<T: MallocSizeOf> MallocSizeOf for [T] {
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fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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let mut n = 0;
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for elem in self.iter() {
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n += elem.size_of(ops);
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}
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n
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}
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}
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impl<T> MallocShallowSizeOf for Vec<T> {
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fn shallow_size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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unsafe { ops.malloc_size_of(self.as_ptr()) }
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}
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}
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impl<T: MallocSizeOf> MallocSizeOf for Vec<T> {
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fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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let mut n = self.shallow_size_of(ops);
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for elem in self.iter() {
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n += elem.size_of(ops);
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}
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n
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}
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}
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macro_rules! malloc_size_of_hash_set {
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($ty:ty) => {
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impl<T, S> MallocShallowSizeOf for $ty
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where
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T: Eq + Hash,
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S: BuildHasher,
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{
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fn shallow_size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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if ops.has_malloc_enclosing_size_of() {
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// The first value from the iterator gives us an interior pointer.
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// `ops.malloc_enclosing_size_of()` then gives us the storage size.
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// This assumes that the `HashSet`'s contents (values and hashes)
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// are all stored in a single contiguous heap allocation.
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self.iter()
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.next()
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.map_or(0, |t| unsafe { ops.malloc_enclosing_size_of(t) })
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} else {
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// An estimate.
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self.capacity() * (size_of::<T>() + size_of::<usize>())
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}
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}
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}
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impl<T, S> MallocSizeOf for $ty
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where
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T: Eq + Hash + MallocSizeOf,
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S: BuildHasher,
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{
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fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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let mut n = self.shallow_size_of(ops);
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for t in self.iter() {
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n += t.size_of(ops);
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}
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n
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}
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}
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};
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}
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malloc_size_of_hash_set!(std::collections::HashSet<T, S>);
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macro_rules! malloc_size_of_hash_map {
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($ty:ty) => {
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impl<K, V, S> MallocShallowSizeOf for $ty
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where
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K: Eq + Hash,
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S: BuildHasher,
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{
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fn shallow_size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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// See the implementation for std::collections::HashSet for details.
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if ops.has_malloc_enclosing_size_of() {
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self.values()
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.next()
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.map_or(0, |v| unsafe { ops.malloc_enclosing_size_of(v) })
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} else {
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self.capacity() * (size_of::<V>() + size_of::<K>() + size_of::<usize>())
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}
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}
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}
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impl<K, V, S> MallocSizeOf for $ty
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where
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K: Eq + Hash + MallocSizeOf,
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V: MallocSizeOf,
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S: BuildHasher,
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{
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fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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let mut n = self.shallow_size_of(ops);
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for (k, v) in self.iter() {
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n += k.size_of(ops);
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n += v.size_of(ops);
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}
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n
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}
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}
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};
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}
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malloc_size_of_hash_map!(std::collections::HashMap<K, V, S>);
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// PhantomData is always 0.
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impl<T> MallocSizeOf for std::marker::PhantomData<T> {
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fn size_of(&self, _ops: &mut MallocSizeOfOps) -> usize {
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0
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}
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}
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impl<T: MallocSizeOf, Unit> MallocSizeOf for euclid::Length<T, Unit> {
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fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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self.0.size_of(ops)
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}
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}
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impl<T: MallocSizeOf, Src, Dst> MallocSizeOf for euclid::TypedScale<T, Src, Dst> {
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fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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self.0.size_of(ops)
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}
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}
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impl<T: MallocSizeOf, U> MallocSizeOf for euclid::TypedPoint2D<T, U> {
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fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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self.x.size_of(ops) + self.y.size_of(ops)
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}
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}
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impl<T: MallocSizeOf, U> MallocSizeOf for euclid::TypedRect<T, U> {
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fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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self.origin.size_of(ops) + self.size.size_of(ops)
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}
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}
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impl<T: MallocSizeOf, U> MallocSizeOf for euclid::TypedSideOffsets2D<T, U> {
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fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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self.top.size_of(ops) +
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self.right.size_of(ops) +
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self.bottom.size_of(ops) +
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self.left.size_of(ops)
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}
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}
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impl<T: MallocSizeOf, U> MallocSizeOf for euclid::TypedSize2D<T, U> {
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fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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self.width.size_of(ops) + self.height.size_of(ops)
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}
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}
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impl<T: MallocSizeOf, Src, Dst> MallocSizeOf for euclid::TypedTransform2D<T, Src, Dst> {
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fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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self.m11.size_of(ops) +
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self.m12.size_of(ops) +
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self.m21.size_of(ops) +
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self.m22.size_of(ops) +
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self.m31.size_of(ops) +
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self.m32.size_of(ops)
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}
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}
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impl<T: MallocSizeOf, Src, Dst> MallocSizeOf for euclid::TypedTransform3D<T, Src, Dst> {
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fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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self.m11.size_of(ops) +
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self.m12.size_of(ops) +
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self.m13.size_of(ops) +
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self.m14.size_of(ops) +
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self.m21.size_of(ops) +
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self.m22.size_of(ops) +
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self.m23.size_of(ops) +
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self.m24.size_of(ops) +
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self.m31.size_of(ops) +
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self.m32.size_of(ops) +
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self.m33.size_of(ops) +
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self.m34.size_of(ops) +
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self.m41.size_of(ops) +
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self.m42.size_of(ops) +
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self.m43.size_of(ops) +
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self.m44.size_of(ops)
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}
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}
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impl<T: MallocSizeOf, U> MallocSizeOf for euclid::TypedVector2D<T, U> {
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fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
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self.x.size_of(ops) + self.y.size_of(ops)
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}
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}
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/// For use on types where size_of() returns 0.
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#[macro_export]
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macro_rules! malloc_size_of_is_0(
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($($ty:ty),+) => (
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$(
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impl $crate::MallocSizeOf for $ty {
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#[inline(always)]
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fn size_of(&self, _: &mut $crate::MallocSizeOfOps) -> usize {
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0
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}
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}
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)+
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);
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($($ty:ident<$($gen:ident),+>),+) => (
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$(
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impl<$($gen: $crate::MallocSizeOf),+> $crate::MallocSizeOf for $ty<$($gen),+> {
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#[inline(always)]
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fn size_of(&self, _: &mut $crate::MallocSizeOfOps) -> usize {
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0
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}
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}
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)+
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);
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);
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malloc_size_of_is_0!(bool, char, str);
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malloc_size_of_is_0!(u8, u16, u32, u64, u128, usize);
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malloc_size_of_is_0!(i8, i16, i32, i64, i128, isize);
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malloc_size_of_is_0!(f32, f64);
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malloc_size_of_is_0!(std::sync::atomic::AtomicBool);
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malloc_size_of_is_0!(std::sync::atomic::AtomicIsize);
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malloc_size_of_is_0!(std::sync::atomic::AtomicUsize);
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malloc_size_of_is_0!(std::num::NonZeroUsize);
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malloc_size_of_is_0!(std::num::NonZeroU32);
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malloc_size_of_is_0!(std::time::Duration);
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malloc_size_of_is_0!(std::time::Instant);
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malloc_size_of_is_0!(std::time::SystemTime);
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malloc_size_of_is_0!(Range<u8>, Range<u16>, Range<u32>, Range<u64>, Range<usize>);
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malloc_size_of_is_0!(Range<i8>, Range<i16>, Range<i32>, Range<i64>, Range<isize>);
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malloc_size_of_is_0!(Range<f32>, Range<f64>);
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malloc_size_of_is_0!(app_units::Au);
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