Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

4 files changed, 1255 insertions, 0 deletions

diff --git a/servo/components/malloc_size_of/Cargo.toml b/servo/components/malloc_size_of/Cargo.toml
new file mode 100644
index 0000000000..7813bb6352
--- /dev/null
+++ b/servo/components/malloc_size_of/Cargo.toml
@@ -0,0 +1,53 @@
+[package]
+name = "malloc_size_of"
+version = "0.0.1"
+authors = ["The Servo Project Developers"]
+license = "MIT/Apache-2.0"
+publish = false
+
+[lib]
+path = "lib.rs"
+
+[features]
+servo = [
+    "accountable-refcell",
+    "content-security-policy",
+    "crossbeam-channel",
+    "hyper",
+    "hyper_serde",
+    "keyboard-types",
+    "serde",
+    "serde_bytes",
+    "string_cache",
+    "time",
+    "url",
+    "uuid",
+    "webrender_api",
+    "xml5ever",
+]
+
+[dependencies]
+accountable-refcell = { version = "0.2.0", optional = true }
+app_units = "0.7"
+content-security-policy = { version = "0.4.0", features = ["serde"], optional = true }
+crossbeam-channel = { version = "0.4", optional = true }
+cssparser = "0.31"
+dom = { path = "../../../dom/base/rust" }
+euclid = "0.22"
+hyper = { version = "0.12", optional = true }
+hyper_serde = { version = "0.11", optional = true }
+keyboard-types = { version = "0.4.3", optional = true }
+selectors = { path = "../selectors" }
+serde = { version = "1.0.27", optional = true }
+serde_bytes = { version = "0.11", optional = true }
+servo_arc = { path = "../servo_arc" }
+smallbitvec = "2.3.0"
+smallvec = "1.0"
+string_cache = { version = "0.8", optional = true }
+thin-vec = { version = "0.2.1", features = ["gecko-ffi"] }
+time = { version = "0.1.17", optional = true }
+url = { version = "2.0", optional = true }
+uuid = { version = "0.8", features = ["v4"], optional = true }
+void = "1.0.2"
+webrender_api = { git = "https://github.com/servo/webrender", optional = true }
+xml5ever = { version = "0.16", optional = true }
diff --git a/servo/components/malloc_size_of/LICENSE-APACHE b/servo/components/malloc_size_of/LICENSE-APACHE
new file mode 100644
index 0000000000..16fe87b06e
--- /dev/null
+++ b/servo/components/malloc_size_of/LICENSE-APACHE
@@ -0,0 +1,201 @@
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diff --git a/servo/components/malloc_size_of/LICENSE-MIT b/servo/components/malloc_size_of/LICENSE-MIT
new file mode 100644
index 0000000000..31aa79387f
--- /dev/null
+++ b/servo/components/malloc_size_of/LICENSE-MIT
@@ -0,0 +1,23 @@
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
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+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
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+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/servo/components/malloc_size_of/lib.rs b/servo/components/malloc_size_of/lib.rs
new file mode 100644
index 0000000000..683fa1eec7
--- /dev/null
+++ b/servo/components/malloc_size_of/lib.rs
@@ -0,0 +1,978 @@
+// Copyright 2016-2017 The Servo Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! A crate for measuring the heap usage of data structures in a way that
+//! integrates with Firefox's memory reporting, particularly the use of
+//! mozjemalloc and DMD. In particular, it has the following features.
+//! - It isn't bound to a particular heap allocator.
+//! - It provides traits for both "shallow" and "deep" measurement, which gives
+//!   flexibility in the cases where the traits can't be used.
+//! - It allows for measuring blocks even when only an interior pointer can be
+//!   obtained for heap allocations, e.g. `HashSet` and `HashMap`. (This relies
+//!   on the heap allocator having suitable support, which mozjemalloc has.)
+//! - It allows handling of types like `Rc` and `Arc` by providing traits that
+//!   are different to the ones for non-graph structures.
+//!
+//! Suggested uses are as follows.
+//! - When possible, use the `MallocSizeOf` trait. (Deriving support is
+//!   provided by the `malloc_size_of_derive` crate.)
+//! - If you need an additional synchronization argument, provide a function
+//!   that is like the standard trait method, but with the extra argument.
+//! - If you need multiple measurements for a type, provide a function named
+//!   `add_size_of` that takes a mutable reference to a struct that contains
+//!   the multiple measurement fields.
+//! - When deep measurement (via `MallocSizeOf`) cannot be implemented for a
+//!   type, shallow measurement (via `MallocShallowSizeOf`) in combination with
+//!   iteration can be a useful substitute.
+//! - `Rc` and `Arc` are always tricky, which is why `MallocSizeOf` is not (and
+//!   should not be) implemented for them.
+//! - If an `Rc` or `Arc` is known to be a "primary" reference and can always
+//!   be measured, it should be measured via the `MallocUnconditionalSizeOf`
+//!   trait.
+//! - If an `Rc` or `Arc` should be measured only if it hasn't been seen
+//!   before, it should be measured via the `MallocConditionalSizeOf` trait.
+//! - Using universal function call syntax is a good idea when measuring boxed
+//!   fields in structs, because it makes it clear that the Box is being
+//!   measured as well as the thing it points to. E.g.
+//!   `<Box<_> as MallocSizeOf>::size_of(field, ops)`.
+//!
+//!   Note: WebRender has a reduced fork of this crate, so that we can avoid
+//!   publishing this crate on crates.io.
+
+#[cfg(feature = "servo")]
+extern crate accountable_refcell;
+extern crate app_units;
+#[cfg(feature = "servo")]
+extern crate content_security_policy;
+#[cfg(feature = "servo")]
+extern crate crossbeam_channel;
+extern crate cssparser;
+extern crate euclid;
+#[cfg(feature = "servo")]
+extern crate hyper;
+#[cfg(feature = "servo")]
+extern crate hyper_serde;
+#[cfg(feature = "servo")]
+extern crate keyboard_types;
+extern crate selectors;
+#[cfg(feature = "servo")]
+extern crate serde;
+#[cfg(feature = "servo")]
+extern crate serde_bytes;
+extern crate servo_arc;
+extern crate smallbitvec;
+extern crate smallvec;
+#[cfg(feature = "servo")]
+extern crate string_cache;
+#[cfg(feature = "servo")]
+extern crate time;
+#[cfg(feature = "url")]
+extern crate url;
+#[cfg(feature = "servo")]
+extern crate uuid;
+extern crate void;
+#[cfg(feature = "webrender_api")]
+extern crate webrender_api;
+#[cfg(feature = "servo")]
+extern crate xml5ever;
+
+#[cfg(feature = "servo")]
+use content_security_policy as csp;
+#[cfg(feature = "servo")]
+use serde_bytes::ByteBuf;
+use std::hash::{BuildHasher, Hash};
+use std::mem::size_of;
+use std::ops::Range;
+use std::ops::{Deref, DerefMut};
+use std::os::raw::c_void;
+#[cfg(feature = "servo")]
+use uuid::Uuid;
+use void::Void;
+
+/// A C function that takes a pointer to a heap allocation and returns its size.
+type VoidPtrToSizeFn = unsafe extern "C" fn(ptr: *const c_void) -> usize;
+
+/// A closure implementing a stateful predicate on pointers.
+type VoidPtrToBoolFnMut = dyn FnMut(*const c_void) -> bool;
+
+/// Operations used when measuring heap usage of data structures.
+pub struct MallocSizeOfOps {
+    /// A function that returns the size of a heap allocation.
+    size_of_op: VoidPtrToSizeFn,
+
+    /// Like `size_of_op`, but can take an interior pointer. Optional because
+    /// not all allocators support this operation. If it's not provided, some
+    /// memory measurements will actually be computed estimates rather than
+    /// real and accurate measurements.
+    enclosing_size_of_op: Option<VoidPtrToSizeFn>,
+
+    /// Check if a pointer has been seen before, and remember it for next time.
+    /// Useful when measuring `Rc`s and `Arc`s. Optional, because many places
+    /// don't need it.
+    have_seen_ptr_op: Option<Box<VoidPtrToBoolFnMut>>,
+}
+
+impl MallocSizeOfOps {
+    pub fn new(
+        size_of: VoidPtrToSizeFn,
+        malloc_enclosing_size_of: Option<VoidPtrToSizeFn>,
+        have_seen_ptr: Option<Box<VoidPtrToBoolFnMut>>,
+    ) -> Self {
+        MallocSizeOfOps {
+            size_of_op: size_of,
+            enclosing_size_of_op: malloc_enclosing_size_of,
+            have_seen_ptr_op: have_seen_ptr,
+        }
+    }
+
+    /// Check if an allocation is empty. This relies on knowledge of how Rust
+    /// handles empty allocations, which may change in the future.
+    fn is_empty<T: ?Sized>(ptr: *const T) -> bool {
+        // The correct condition is this:
+        //   `ptr as usize <= ::std::mem::align_of::<T>()`
+        // But we can't call align_of() on a ?Sized T. So we approximate it
+        // with the following. 256 is large enough that it should always be
+        // larger than the required alignment, but small enough that it is
+        // always in the first page of memory and therefore not a legitimate
+        // address.
+        return ptr as *const usize as usize <= 256;
+    }
+
+    /// Call `size_of_op` on `ptr`, first checking that the allocation isn't
+    /// empty, because some types (such as `Vec`) utilize empty allocations.
+    pub unsafe fn malloc_size_of<T: ?Sized>(&self, ptr: *const T) -> usize {
+        if MallocSizeOfOps::is_empty(ptr) {
+            0
+        } else {
+            (self.size_of_op)(ptr as *const c_void)
+        }
+    }
+
+    /// Is an `enclosing_size_of_op` available?
+    pub fn has_malloc_enclosing_size_of(&self) -> bool {
+        self.enclosing_size_of_op.is_some()
+    }
+
+    /// Call `enclosing_size_of_op`, which must be available, on `ptr`, which
+    /// must not be empty.
+    pub unsafe fn malloc_enclosing_size_of<T>(&self, ptr: *const T) -> usize {
+        assert!(!MallocSizeOfOps::is_empty(ptr));
+        (self.enclosing_size_of_op.unwrap())(ptr as *const c_void)
+    }
+
+    /// Call `have_seen_ptr_op` on `ptr`.
+    pub fn have_seen_ptr<T>(&mut self, ptr: *const T) -> bool {
+        let have_seen_ptr_op = self
+            .have_seen_ptr_op
+            .as_mut()
+            .expect("missing have_seen_ptr_op");
+        have_seen_ptr_op(ptr as *const c_void)
+    }
+}
+
+/// Trait for measuring the "deep" heap usage of a data structure. This is the
+/// most commonly-used of the traits.
+pub trait MallocSizeOf {
+    /// Measure the heap usage of all descendant heap-allocated structures, but
+    /// not the space taken up by the value itself.
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize;
+}
+
+/// Trait for measuring the "shallow" heap usage of a container.
+pub trait MallocShallowSizeOf {
+    /// Measure the heap usage of immediate heap-allocated descendant
+    /// structures, but not the space taken up by the value itself. Anything
+    /// beyond the immediate descendants must be measured separately, using
+    /// iteration.
+    fn shallow_size_of(&self, ops: &mut MallocSizeOfOps) -> usize;
+}
+
+/// Like `MallocSizeOf`, but with a different name so it cannot be used
+/// accidentally with derive(MallocSizeOf). For use with types like `Rc` and
+/// `Arc` when appropriate (e.g. when measuring a "primary" reference).
+pub trait MallocUnconditionalSizeOf {
+    /// Measure the heap usage of all heap-allocated descendant structures, but
+    /// not the space taken up by the value itself.
+    fn unconditional_size_of(&self, ops: &mut MallocSizeOfOps) -> usize;
+}
+
+/// `MallocUnconditionalSizeOf` combined with `MallocShallowSizeOf`.
+pub trait MallocUnconditionalShallowSizeOf {
+    /// `unconditional_size_of` combined with `shallow_size_of`.
+    fn unconditional_shallow_size_of(&self, ops: &mut MallocSizeOfOps) -> usize;
+}
+
+/// Like `MallocSizeOf`, but only measures if the value hasn't already been
+/// measured. For use with types like `Rc` and `Arc` when appropriate (e.g.
+/// when there is no "primary" reference).
+pub trait MallocConditionalSizeOf {
+    /// Measure the heap usage of all heap-allocated descendant structures, but
+    /// not the space taken up by the value itself, and only if that heap usage
+    /// hasn't already been measured.
+    fn conditional_size_of(&self, ops: &mut MallocSizeOfOps) -> usize;
+}
+
+/// `MallocConditionalSizeOf` combined with `MallocShallowSizeOf`.
+pub trait MallocConditionalShallowSizeOf {
+    /// `conditional_size_of` combined with `shallow_size_of`.
+    fn conditional_shallow_size_of(&self, ops: &mut MallocSizeOfOps) -> usize;
+}
+
+impl MallocSizeOf for String {
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        unsafe { ops.malloc_size_of(self.as_ptr()) }
+    }
+}
+
+impl<'a, T: ?Sized> MallocSizeOf for &'a T {
+    fn size_of(&self, _ops: &mut MallocSizeOfOps) -> usize {
+        // Zero makes sense for a non-owning reference.
+        0
+    }
+}
+
+impl<T: ?Sized> MallocShallowSizeOf for Box<T> {
+    fn shallow_size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        unsafe { ops.malloc_size_of(&**self) }
+    }
+}
+
+impl<T: MallocSizeOf + ?Sized> MallocSizeOf for Box<T> {
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        self.shallow_size_of(ops) + (**self).size_of(ops)
+    }
+}
+
+impl MallocSizeOf for () {
+    fn size_of(&self, _ops: &mut MallocSizeOfOps) -> usize {
+        0
+    }
+}
+
+impl<T1, T2> MallocSizeOf for (T1, T2)
+where
+    T1: MallocSizeOf,
+    T2: MallocSizeOf,
+{
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        self.0.size_of(ops) + self.1.size_of(ops)
+    }
+}
+
+impl<T1, T2, T3> MallocSizeOf for (T1, T2, T3)
+where
+    T1: MallocSizeOf,
+    T2: MallocSizeOf,
+    T3: MallocSizeOf,
+{
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        self.0.size_of(ops) + self.1.size_of(ops) + self.2.size_of(ops)
+    }
+}
+
+impl<T1, T2, T3, T4> MallocSizeOf for (T1, T2, T3, T4)
+where
+    T1: MallocSizeOf,
+    T2: MallocSizeOf,
+    T3: MallocSizeOf,
+    T4: MallocSizeOf,
+{
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        self.0.size_of(ops) + self.1.size_of(ops) + self.2.size_of(ops) + self.3.size_of(ops)
+    }
+}
+
+impl<T: MallocSizeOf> MallocSizeOf for Option<T> {
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        if let Some(val) = self.as_ref() {
+            val.size_of(ops)
+        } else {
+            0
+        }
+    }
+}
+
+impl<T: MallocSizeOf, E: MallocSizeOf> MallocSizeOf for Result<T, E> {
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        match *self {
+            Ok(ref x) => x.size_of(ops),
+            Err(ref e) => e.size_of(ops),
+        }
+    }
+}
+
+impl<T: MallocSizeOf + Copy> MallocSizeOf for std::cell::Cell<T> {
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        self.get().size_of(ops)
+    }
+}
+
+impl<T: MallocSizeOf> MallocSizeOf for std::cell::RefCell<T> {
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        self.borrow().size_of(ops)
+    }
+}
+
+impl<'a, B: ?Sized + ToOwned> MallocSizeOf for std::borrow::Cow<'a, B>
+where
+    B::Owned: MallocSizeOf,
+{
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        match *self {
+            std::borrow::Cow::Borrowed(_) => 0,
+            std::borrow::Cow::Owned(ref b) => b.size_of(ops),
+        }
+    }
+}
+
+impl<T: MallocSizeOf> MallocSizeOf for [T] {
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        let mut n = 0;
+        for elem in self.iter() {
+            n += elem.size_of(ops);
+        }
+        n
+    }
+}
+
+#[cfg(feature = "servo")]
+impl MallocShallowSizeOf for ByteBuf {
+    fn shallow_size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        unsafe { ops.malloc_size_of(self.as_ptr()) }
+    }
+}
+
+#[cfg(feature = "servo")]
+impl MallocSizeOf for ByteBuf {
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        let mut n = self.shallow_size_of(ops);
+        for elem in self.iter() {
+            n += elem.size_of(ops);
+        }
+        n
+    }
+}
+
+impl<T> MallocShallowSizeOf for Vec<T> {
+    fn shallow_size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        unsafe { ops.malloc_size_of(self.as_ptr()) }
+    }
+}
+
+impl<T: MallocSizeOf> MallocSizeOf for Vec<T> {
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        let mut n = self.shallow_size_of(ops);
+        for elem in self.iter() {
+            n += elem.size_of(ops);
+        }
+        n
+    }
+}
+
+impl<T> MallocShallowSizeOf for std::collections::VecDeque<T> {
+    fn shallow_size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        if ops.has_malloc_enclosing_size_of() {
+            if let Some(front) = self.front() {
+                // The front element is an interior pointer.
+                unsafe { ops.malloc_enclosing_size_of(&*front) }
+            } else {
+                // This assumes that no memory is allocated when the VecDeque is empty.
+                0
+            }
+        } else {
+            // An estimate.
+            self.capacity() * size_of::<T>()
+        }
+    }
+}
+
+impl<T: MallocSizeOf> MallocSizeOf for std::collections::VecDeque<T> {
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        let mut n = self.shallow_size_of(ops);
+        for elem in self.iter() {
+            n += elem.size_of(ops);
+        }
+        n
+    }
+}
+
+impl<A: smallvec::Array> MallocShallowSizeOf for smallvec::SmallVec<A> {
+    fn shallow_size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        if self.spilled() {
+            unsafe { ops.malloc_size_of(self.as_ptr()) }
+        } else {
+            0
+        }
+    }
+}
+
+impl<A> MallocSizeOf for smallvec::SmallVec<A>
+where
+    A: smallvec::Array,
+    A::Item: MallocSizeOf,
+{
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        let mut n = self.shallow_size_of(ops);
+        for elem in self.iter() {
+            n += elem.size_of(ops);
+        }
+        n
+    }
+}
+
+impl<T> MallocShallowSizeOf for thin_vec::ThinVec<T> {
+    fn shallow_size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        if self.capacity() == 0 {
+            // If it's the singleton we might not be a heap pointer.
+            return 0;
+        }
+
+        assert_eq!(
+            std::mem::size_of::<Self>(),
+            std::mem::size_of::<*const ()>()
+        );
+        unsafe { ops.malloc_size_of(*(self as *const Self as *const *const ())) }
+    }
+}
+
+impl<T: MallocSizeOf> MallocSizeOf for thin_vec::ThinVec<T> {
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        let mut n = self.shallow_size_of(ops);
+        for elem in self.iter() {
+            n += elem.size_of(ops);
+        }
+        n
+    }
+}
+
+macro_rules! malloc_size_of_hash_set {
+    ($ty:ty) => {
+        impl<T, S> MallocShallowSizeOf for $ty
+        where
+            T: Eq + Hash,
+            S: BuildHasher,
+        {
+            fn shallow_size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+                if ops.has_malloc_enclosing_size_of() {
+                    // The first value from the iterator gives us an interior pointer.
+                    // `ops.malloc_enclosing_size_of()` then gives us the storage size.
+                    // This assumes that the `HashSet`'s contents (values and hashes)
+                    // are all stored in a single contiguous heap allocation.
+                    self.iter()
+                        .next()
+                        .map_or(0, |t| unsafe { ops.malloc_enclosing_size_of(t) })
+                } else {
+                    // An estimate.
+                    self.capacity() * (size_of::<T>() + size_of::<usize>())
+                }
+            }
+        }
+
+        impl<T, S> MallocSizeOf for $ty
+        where
+            T: Eq + Hash + MallocSizeOf,
+            S: BuildHasher,
+        {
+            fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+                let mut n = self.shallow_size_of(ops);
+                for t in self.iter() {
+                    n += t.size_of(ops);
+                }
+                n
+            }
+        }
+    };
+}
+
+malloc_size_of_hash_set!(std::collections::HashSet<T, S>);
+
+macro_rules! malloc_size_of_hash_map {
+    ($ty:ty) => {
+        impl<K, V, S> MallocShallowSizeOf for $ty
+        where
+            K: Eq + Hash,
+            S: BuildHasher,
+        {
+            fn shallow_size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+                // See the implementation for std::collections::HashSet for details.
+                if ops.has_malloc_enclosing_size_of() {
+                    self.values()
+                        .next()
+                        .map_or(0, |v| unsafe { ops.malloc_enclosing_size_of(v) })
+                } else {
+                    self.capacity() * (size_of::<V>() + size_of::<K>() + size_of::<usize>())
+                }
+            }
+        }
+
+        impl<K, V, S> MallocSizeOf for $ty
+        where
+            K: Eq + Hash + MallocSizeOf,
+            V: MallocSizeOf,
+            S: BuildHasher,
+        {
+            fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+                let mut n = self.shallow_size_of(ops);
+                for (k, v) in self.iter() {
+                    n += k.size_of(ops);
+                    n += v.size_of(ops);
+                }
+                n
+            }
+        }
+    };
+}
+
+malloc_size_of_hash_map!(std::collections::HashMap<K, V, S>);
+
+impl<K, V> MallocShallowSizeOf for std::collections::BTreeMap<K, V>
+where
+    K: Eq + Hash,
+{
+    fn shallow_size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        if ops.has_malloc_enclosing_size_of() {
+            self.values()
+                .next()
+                .map_or(0, |v| unsafe { ops.malloc_enclosing_size_of(v) })
+        } else {
+            self.len() * (size_of::<V>() + size_of::<K>() + size_of::<usize>())
+        }
+    }
+}
+
+impl<K, V> MallocSizeOf for std::collections::BTreeMap<K, V>
+where
+    K: Eq + Hash + MallocSizeOf,
+    V: MallocSizeOf,
+{
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        let mut n = self.shallow_size_of(ops);
+        for (k, v) in self.iter() {
+            n += k.size_of(ops);
+            n += v.size_of(ops);
+        }
+        n
+    }
+}
+
+// PhantomData is always 0.
+impl<T> MallocSizeOf for std::marker::PhantomData<T> {
+    fn size_of(&self, _ops: &mut MallocSizeOfOps) -> usize {
+        0
+    }
+}
+
+// XXX: we don't want MallocSizeOf to be defined for Rc and Arc. If negative
+// trait bounds are ever allowed, this code should be uncommented.
+// (We do have a compile-fail test for this:
+// rc_arc_must_not_derive_malloc_size_of.rs)
+//impl<T> !MallocSizeOf for Arc<T> { }
+//impl<T> !MallocShallowSizeOf for Arc<T> { }
+
+impl<T> MallocUnconditionalShallowSizeOf for servo_arc::Arc<T> {
+    fn unconditional_shallow_size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        unsafe { ops.malloc_size_of(self.heap_ptr()) }
+    }
+}
+
+impl<T: MallocSizeOf> MallocUnconditionalSizeOf for servo_arc::Arc<T> {
+    fn unconditional_size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        self.unconditional_shallow_size_of(ops) + (**self).size_of(ops)
+    }
+}
+
+impl<T> MallocConditionalShallowSizeOf for servo_arc::Arc<T> {
+    fn conditional_shallow_size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        if ops.have_seen_ptr(self.heap_ptr()) {
+            0
+        } else {
+            self.unconditional_shallow_size_of(ops)
+        }
+    }
+}
+
+impl<T: MallocSizeOf> MallocConditionalSizeOf for servo_arc::Arc<T> {
+    fn conditional_size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        if ops.have_seen_ptr(self.heap_ptr()) {
+            0
+        } else {
+            self.unconditional_size_of(ops)
+        }
+    }
+}
+
+/// If a mutex is stored directly as a member of a data type that is being measured,
+/// it is the unique owner of its contents and deserves to be measured.
+///
+/// If a mutex is stored inside of an Arc value as a member of a data type that is being measured,
+/// the Arc will not be automatically measured so there is no risk of overcounting the mutex's
+/// contents.
+impl<T: MallocSizeOf> MallocSizeOf for std::sync::Mutex<T> {
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        (*self.lock().unwrap()).size_of(ops)
+    }
+}
+
+impl MallocSizeOf for smallbitvec::SmallBitVec {
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        if let Some(ptr) = self.heap_ptr() {
+            unsafe { ops.malloc_size_of(ptr) }
+        } else {
+            0
+        }
+    }
+}
+
+impl<T: MallocSizeOf, Unit> MallocSizeOf for euclid::Length<T, Unit> {
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        self.0.size_of(ops)
+    }
+}
+
+impl<T: MallocSizeOf, Src, Dst> MallocSizeOf for euclid::Scale<T, Src, Dst> {
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        self.0.size_of(ops)
+    }
+}
+
+impl<T: MallocSizeOf, U> MallocSizeOf for euclid::Point2D<T, U> {
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        self.x.size_of(ops) + self.y.size_of(ops)
+    }
+}
+
+impl<T: MallocSizeOf, U> MallocSizeOf for euclid::Rect<T, U> {
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        self.origin.size_of(ops) + self.size.size_of(ops)
+    }
+}
+
+impl<T: MallocSizeOf, U> MallocSizeOf for euclid::SideOffsets2D<T, U> {
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        self.top.size_of(ops) +
+            self.right.size_of(ops) +
+            self.bottom.size_of(ops) +
+            self.left.size_of(ops)
+    }
+}
+
+impl<T: MallocSizeOf, U> MallocSizeOf for euclid::Size2D<T, U> {
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        self.width.size_of(ops) + self.height.size_of(ops)
+    }
+}
+
+impl<T: MallocSizeOf, Src, Dst> MallocSizeOf for euclid::Transform2D<T, Src, Dst> {
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        self.m11.size_of(ops) +
+            self.m12.size_of(ops) +
+            self.m21.size_of(ops) +
+            self.m22.size_of(ops) +
+            self.m31.size_of(ops) +
+            self.m32.size_of(ops)
+    }
+}
+
+impl<T: MallocSizeOf, Src, Dst> MallocSizeOf for euclid::Transform3D<T, Src, Dst> {
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        self.m11.size_of(ops) +
+            self.m12.size_of(ops) +
+            self.m13.size_of(ops) +
+            self.m14.size_of(ops) +
+            self.m21.size_of(ops) +
+            self.m22.size_of(ops) +
+            self.m23.size_of(ops) +
+            self.m24.size_of(ops) +
+            self.m31.size_of(ops) +
+            self.m32.size_of(ops) +
+            self.m33.size_of(ops) +
+            self.m34.size_of(ops) +
+            self.m41.size_of(ops) +
+            self.m42.size_of(ops) +
+            self.m43.size_of(ops) +
+            self.m44.size_of(ops)
+    }
+}
+
+impl<T: MallocSizeOf, U> MallocSizeOf for euclid::Vector2D<T, U> {
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        self.x.size_of(ops) + self.y.size_of(ops)
+    }
+}
+
+impl MallocSizeOf for selectors::parser::AncestorHashes {
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        let selectors::parser::AncestorHashes { ref packed_hashes } = *self;
+        packed_hashes.size_of(ops)
+    }
+}
+
+impl<Impl: selectors::parser::SelectorImpl> MallocSizeOf for selectors::parser::Selector<Impl>
+where
+    Impl::NonTSPseudoClass: MallocSizeOf,
+    Impl::PseudoElement: MallocSizeOf,
+{
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        let mut n = 0;
+
+        // It's OK to measure this ThinArc directly because it's the
+        // "primary" reference. (The secondary references are on the
+        // Stylist.)
+        n += unsafe { ops.malloc_size_of(self.thin_arc_heap_ptr()) };
+        for component in self.iter_raw_match_order() {
+            n += component.size_of(ops);
+        }
+
+        n
+    }
+}
+
+impl<Impl: selectors::parser::SelectorImpl> MallocSizeOf for selectors::parser::Component<Impl>
+where
+    Impl::NonTSPseudoClass: MallocSizeOf,
+    Impl::PseudoElement: MallocSizeOf,
+{
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        use selectors::parser::Component;
+
+        match self {
+            Component::AttributeOther(ref attr_selector) => attr_selector.size_of(ops),
+            Component::Negation(ref components) => components.size_of(ops),
+            Component::NonTSPseudoClass(ref pseudo) => (*pseudo).size_of(ops),
+            Component::Slotted(ref selector) | Component::Host(Some(ref selector)) => {
+                selector.size_of(ops)
+            },
+            Component::Is(ref list) | Component::Where(ref list) => list.size_of(ops),
+            Component::Has(ref relative_selectors) => relative_selectors.size_of(ops),
+            Component::NthOf(ref nth_of_data) => nth_of_data.size_of(ops),
+            Component::PseudoElement(ref pseudo) => (*pseudo).size_of(ops),
+            Component::Combinator(..) |
+            Component::ExplicitAnyNamespace |
+            Component::ExplicitNoNamespace |
+            Component::DefaultNamespace(..) |
+            Component::Namespace(..) |
+            Component::ExplicitUniversalType |
+            Component::LocalName(..) |
+            Component::ID(..) |
+            Component::Part(..) |
+            Component::Class(..) |
+            Component::AttributeInNoNamespaceExists { .. } |
+            Component::AttributeInNoNamespace { .. } |
+            Component::Root |
+            Component::Empty |
+            Component::Scope |
+            Component::ParentSelector |
+            Component::Nth(..) |
+            Component::Host(None) |
+            Component::RelativeSelectorAnchor => 0,
+        }
+    }
+}
+
+impl<Impl: selectors::parser::SelectorImpl> MallocSizeOf
+    for selectors::attr::AttrSelectorWithOptionalNamespace<Impl>
+{
+    fn size_of(&self, _ops: &mut MallocSizeOfOps) -> usize {
+        0
+    }
+}
+
+impl MallocSizeOf for Void {
+    #[inline]
+    fn size_of(&self, _ops: &mut MallocSizeOfOps) -> usize {
+        void::unreachable(*self)
+    }
+}
+
+#[cfg(feature = "servo")]
+impl<Static: string_cache::StaticAtomSet> MallocSizeOf for string_cache::Atom<Static> {
+    fn size_of(&self, _ops: &mut MallocSizeOfOps) -> usize {
+        0
+    }
+}
+
+/// For use on types where size_of() returns 0.
+#[macro_export]
+macro_rules! malloc_size_of_is_0(
+    ($($ty:ty),+) => (
+        $(
+            impl $crate::MallocSizeOf for $ty {
+                #[inline(always)]
+                fn size_of(&self, _: &mut $crate::MallocSizeOfOps) -> usize {
+                    0
+                }
+            }
+        )+
+    );
+    ($($ty:ident<$($gen:ident),+>),+) => (
+        $(
+        impl<$($gen: $crate::MallocSizeOf),+> $crate::MallocSizeOf for $ty<$($gen),+> {
+            #[inline(always)]
+            fn size_of(&self, _: &mut $crate::MallocSizeOfOps) -> usize {
+                0
+            }
+        }
+        )+
+    );
+);
+
+malloc_size_of_is_0!(bool, char, str);
+malloc_size_of_is_0!(u8, u16, u32, u64, u128, usize);
+malloc_size_of_is_0!(i8, i16, i32, i64, i128, isize);
+malloc_size_of_is_0!(f32, f64);
+
+malloc_size_of_is_0!(std::sync::atomic::AtomicBool);
+malloc_size_of_is_0!(std::sync::atomic::AtomicIsize);
+malloc_size_of_is_0!(std::sync::atomic::AtomicUsize);
+
+malloc_size_of_is_0!(Range<u8>, Range<u16>, Range<u32>, Range<u64>, Range<usize>);
+malloc_size_of_is_0!(Range<i8>, Range<i16>, Range<i32>, Range<i64>, Range<isize>);
+malloc_size_of_is_0!(Range<f32>, Range<f64>);
+
+malloc_size_of_is_0!(app_units::Au);
+
+malloc_size_of_is_0!(cssparser::RGBA, cssparser::TokenSerializationType);
+
+malloc_size_of_is_0!(dom::ElementState, dom::DocumentState);
+
+#[cfg(feature = "servo")]
+malloc_size_of_is_0!(csp::Destination);
+
+#[cfg(feature = "servo")]
+malloc_size_of_is_0!(Uuid);
+
+#[cfg(feature = "url")]
+impl MallocSizeOf for url::Host {
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        match *self {
+            url::Host::Domain(ref s) => s.size_of(ops),
+            _ => 0,
+        }
+    }
+}
+#[cfg(feature = "webrender_api")]
+malloc_size_of_is_0!(webrender_api::BorderRadius);
+#[cfg(feature = "webrender_api")]
+malloc_size_of_is_0!(webrender_api::BorderStyle);
+#[cfg(feature = "webrender_api")]
+malloc_size_of_is_0!(webrender_api::BoxShadowClipMode);
+#[cfg(feature = "webrender_api")]
+malloc_size_of_is_0!(webrender_api::ColorF);
+#[cfg(feature = "webrender_api")]
+malloc_size_of_is_0!(webrender_api::ComplexClipRegion);
+#[cfg(feature = "webrender_api")]
+malloc_size_of_is_0!(webrender_api::ExtendMode);
+#[cfg(feature = "webrender_api")]
+malloc_size_of_is_0!(webrender_api::FilterOp);
+#[cfg(feature = "webrender_api")]
+malloc_size_of_is_0!(webrender_api::ExternalScrollId);
+#[cfg(feature = "webrender_api")]
+malloc_size_of_is_0!(webrender_api::FontInstanceKey);
+#[cfg(feature = "webrender_api")]
+malloc_size_of_is_0!(webrender_api::GradientStop);
+#[cfg(feature = "webrender_api")]
+malloc_size_of_is_0!(webrender_api::GlyphInstance);
+#[cfg(feature = "webrender_api")]
+malloc_size_of_is_0!(webrender_api::NinePatchBorder);
+#[cfg(feature = "webrender_api")]
+malloc_size_of_is_0!(webrender_api::ImageKey);
+#[cfg(feature = "webrender_api")]
+malloc_size_of_is_0!(webrender_api::ImageRendering);
+#[cfg(feature = "webrender_api")]
+malloc_size_of_is_0!(webrender_api::LineStyle);
+#[cfg(feature = "webrender_api")]
+malloc_size_of_is_0!(webrender_api::MixBlendMode);
+#[cfg(feature = "webrender_api")]
+malloc_size_of_is_0!(webrender_api::NormalBorder);
+#[cfg(feature = "webrender_api")]
+malloc_size_of_is_0!(webrender_api::RepeatMode);
+#[cfg(feature = "webrender_api")]
+malloc_size_of_is_0!(webrender_api::StickyOffsetBounds);
+#[cfg(feature = "webrender_api")]
+malloc_size_of_is_0!(webrender_api::TransformStyle);
+
+#[cfg(feature = "servo")]
+impl MallocSizeOf for keyboard_types::Key {
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        match self {
+            keyboard_types::Key::Character(ref s) => s.size_of(ops),
+            _ => 0,
+        }
+    }
+}
+
+#[cfg(feature = "servo")]
+malloc_size_of_is_0!(keyboard_types::Modifiers);
+
+#[cfg(feature = "servo")]
+impl MallocSizeOf for xml5ever::QualName {
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        self.prefix.size_of(ops) + self.ns.size_of(ops) + self.local.size_of(ops)
+    }
+}
+
+#[cfg(feature = "servo")]
+malloc_size_of_is_0!(time::Duration);
+#[cfg(feature = "servo")]
+malloc_size_of_is_0!(time::Tm);
+
+#[cfg(feature = "servo")]
+impl<T> MallocSizeOf for hyper_serde::Serde<T>
+where
+    for<'de> hyper_serde::De<T>: serde::Deserialize<'de>,
+    for<'a> hyper_serde::Ser<'a, T>: serde::Serialize,
+    T: MallocSizeOf,
+{
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        self.0.size_of(ops)
+    }
+}
+
+// Placeholder for unique case where internals of Sender cannot be measured.
+// malloc size of is 0 macro complains about type supplied!
+#[cfg(feature = "servo")]
+impl<T> MallocSizeOf for crossbeam_channel::Sender<T> {
+    fn size_of(&self, _ops: &mut MallocSizeOfOps) -> usize {
+        0
+    }
+}
+
+#[cfg(feature = "servo")]
+impl MallocSizeOf for hyper::StatusCode {
+    fn size_of(&self, _ops: &mut MallocSizeOfOps) -> usize {
+        0
+    }
+}
+
+/// Measurable that defers to inner value and used to verify MallocSizeOf implementation in a
+/// struct.
+#[derive(Clone)]
+pub struct Measurable<T: MallocSizeOf>(pub T);
+
+impl<T: MallocSizeOf> Deref for Measurable<T> {
+    type Target = T;
+
+    fn deref(&self) -> &T {
+        &self.0
+    }
+}
+
+impl<T: MallocSizeOf> DerefMut for Measurable<T> {
+    fn deref_mut(&mut self) -> &mut T {
+        &mut self.0
+    }
+}
+
+#[cfg(feature = "servo")]
+impl<T: MallocSizeOf> MallocSizeOf for accountable_refcell::RefCell<T> {
+    fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize {
+        self.borrow().size_of(ops)
+    }
+}