Ensure clean shutdown of JS threads
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FIX https://github.com/servo/servo/issues/26685
FIX https://github.com/servo/servo/issues/26996
FIX https://github.com/servo/servo/issues/9672FIX#27027
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Support for webxr layer management
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This adds layer management to servo's webxr implementation, and removes all the special-cased code for openxr surface creation and opaque framebuffers.
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Implement GPUBuffer.mapAsync and update wgpu-core
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This PR covers the following-
1. update wgpu-core to use serializable `RenderPass` and `ComputePass`. Implement `DispatchIndirect`.
2. Implement `GPUBuffer.mapAsync()`.
The `mapAsync()` methods has the following flow-
1. A new promise is created in `mapAsync()` and a message sent to the server-side. This returns a promise.
2. On the server-side, a `struct BufferMapInfo` object stores the relevant info required to send data to the client-side on completion of mapping. This object is stored in a `buffer_maps: HashMap<id::BufferId, BufferMapInfo<'a>>,` in `WGPU`. `buffers_maps` basically stores the data for buffers with pending mapping.
3. `buffer_map_async()` command is issued with a callback responsible to send the data back to the client.
4. All the devices are polled every time the server receives a new message.
5. The data is sent back on completion and promise resolved through `AsyncWGPUListener` (similar to how the `requestDevice()` and `RequestAdapter` are processed).
6. On receiving the data, the client sends back a `BufferMapComplete` message to the server to remove the entry from `buffer_maps` hashmap.
I intended to implement `getMappedRange()`, too, in this PR but it's quite a task in itself (implementing intersecting ArrayBuffers). This already being a 500+ line PR, I thought it best to get this model approved first (also it will probably be easier to review this and `getMappedRange` separately). `getMappedRange` would come up in the next one.
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Update winapi
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build(deps): bump openssl from 0.10.29 to 0.10.30
Bumps [openssl](https://github.com/sfackler/rust-openssl) from 0.10.29 to 0.10.30.
<details>
<summary>Commits</summary>
<ul>
<li><a href="d8395ba415"><code>d8395ba</code></a> Release openssl v0.10.30</li>
<li><a href="ff4a2152dc"><code>ff4a215</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/sfackler/rust-openssl/issues/1306">#1306</a> from crdumoul/master</li>
<li><a href="78c77b288c"><code>78c77b2</code></a> Add SslStream::from_raw_parts</li>
<li><a href="164bb84bd1"><code>164bb84</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/sfackler/rust-openssl/issues/1299">#1299</a> from flokli/siganture</li>
<li><a href="3e12906302"><code>3e12906</code></a> sign.rs: fix typo in comment</li>
<li><a href="2f98f1c821"><code>2f98f1c</code></a> Fix CI branch</li>
<li><a href="f5c89a0b94"><code>f5c89a0</code></a> remove appveyor builds</li>
<li><a href="7546bfd148"><code>7546bfd</code></a> Ignore default verify paths test on windows</li>
<li><a href="60118dddad"><code>60118dd</code></a> test env lookup</li>
<li><a href="52c1b6fdc2"><code>52c1b6f</code></a> set vcpkg root</li>
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build(deps): bump procedural-masquerade from 0.1.6 to 0.1.7
Bumps [procedural-masquerade](https://github.com/servo/rust-cssparser) from 0.1.6 to 0.1.7.
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<li><a href="3e911361d2"><code>3e91136</code></a> Auto merge of <a href="https://github-redirect.dependabot.com/servo/rust-cssparser/issues/274">#274</a> - servo:pretty-printing-agnostic, r=emilio</li>
<li><a href="2976bf450b"><code>2976bf4</code></a> Make procedural-masquerade resilient to macro input pretty-printing changes</li>
<li><a href="7c9854ebf5"><code>7c9854e</code></a> Auto merge of <a href="https://github-redirect.dependabot.com/servo/rust-cssparser/issues/267">#267</a> - servo:bump-smallvec, r=emilio</li>
<li><a href="ef8162e6b7"><code>ef8162e</code></a> Auto merge of <a href="https://github-redirect.dependabot.com/servo/rust-cssparser/issues/269">#269</a> - servo:nll, r=SimonSapin</li>
<li><a href="cfd59cabd5"><code>cfd59ca</code></a> Clean up a bit now that lifetimes are non-lexical.</li>
<li><a href="efc1b25b69"><code>efc1b25</code></a> Bump smallvec to 1.0, release new minor version (0.27.2)</li>
<li><a href="65d6c3e0a5"><code>65d6c3e</code></a> Auto merge of <a href="https://github-redirect.dependabot.com/servo/rust-cssparser/issues/265">#265</a> - servo:those-without-syn, r=nox</li>
<li><a href="d4af92c10b"><code>d4af92c</code></a> Simplify the implementation of ascii_case_insensitive_phf_map</li>
<li><a href="610cc2215c"><code>610cc22</code></a> Add support for attributes on match arms in match_ignore_ascii_case!</li>
<li><a href="5188d5e0b2"><code>5188d5e</code></a> Auto merge of <a href="https://github-redirect.dependabot.com/servo/rust-cssparser/issues/264">#264</a> - servo:those-without-syn, r=nox</li>
<li>Additional commits viewable in <a href="https://github.com/servo/rust-cssparser/compare/procedural-masquerade-v0.1.6...procedural-masquerade-v0.1.7">compare view</a></li>
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build(deps): bump miow from 0.3.3 to 0.3.5
Bumps [miow](https://github.com/yoshuawuyts/miow) from 0.3.3 to 0.3.5.
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build(deps): bump rayon from 1.3.0 to 1.3.1
Bumps [rayon](https://github.com/rayon-rs/rayon) from 1.3.0 to 1.3.1.
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<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/rayon-rs/rayon/blob/master/RELEASES.md">rayon's changelog</a>.</em></p>
<blockquote>
<h1>Release rayon 1.3.1 / rayon-core 1.7.1 (2020-06-15)</h1>
<ul>
<li>Fixed a use-after-free race in calls blocked between two rayon thread pools.</li>
<li>Collecting to an indexed <code>Vec</code> now drops any partial writes while unwinding,
rather than just leaking them. If dropping also panics, Rust will abort.
<ul>
<li>Note: the old leaking behavior is considered <em>safe</em>, just not ideal.</li>
</ul>
</li>
<li>The new <code>IndexedParallelIterator::step_by()</code> adapts an iterator to step
through items by the given count, like <code>Iterator::step_by()</code>.</li>
<li>The new <code>ParallelSlice::par_chunks_exact()</code> and mutable equivalent
<code>ParallelSliceMut::par_chunks_exact_mut()</code> ensure that the chunks always have
the exact length requested, leaving any remainder separate, like the slice
methods <code>chunks_exact()</code> and <code>chunks_exact_mut()</code>.</li>
</ul>
<h2>Contributors</h2>
<p>Thanks to all of the contributors for this release!</p>
<ul>
<li><a href="https://github.com/adrian5">@adrian5</a></li>
<li><a href="https://github.com/bluss">@bluss</a></li>
<li><a href="https://github.com/cuviper">@cuviper</a></li>
<li><a href="https://github.com/FlyingCanoe">@FlyingCanoe</a></li>
<li><a href="https://github.com/GuillaumeGomez">@GuillaumeGomez</a></li>
<li><a href="https://github.com/matthiasbeyer">@matthiasbeyer</a></li>
<li><a href="https://github.com/picoHz">@picoHz</a></li>
<li><a href="https://github.com/zesterer">@zesterer</a></li>
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<li><a href="a798276590"><code>a798276</code></a> Merge <a href="https://github-redirect.dependabot.com/rayon-rs/rayon/issues/769">#769</a></li>
<li><a href="4bce3c8f27"><code>4bce3c8</code></a> Update ci/compat-Cargo.lock</li>
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<li><a href="8f58a12b51"><code>8f58a12</code></a> Fix wrong examples of find_map variants</li>
<li><a href="b5e81efdda"><code>b5e81ef</code></a> Merge <a href="https://github-redirect.dependabot.com/rayon-rs/rayon/issues/759">#759</a></li>
<li><a href="94baa8232c"><code>94baa82</code></a> Add collect unwinding test for zero-sized elements</li>
<li><a href="b5869e4553"><code>b5869e4</code></a> Remove redundant Send impl for CollectFolder</li>
<li><a href="7a0c42e649"><code>7a0c42e</code></a> Move collect test to its own file</li>
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build(deps): bump urlencoding from 1.0.0 to 1.1.1
Bumps [urlencoding](https://github.com/kornelski/rust_urlencoding) from 1.0.0 to 1.1.1.
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animations: Finish support for fractional iteration counts
This change also improves support for creating animations with negative
delays, as that is necessary to test support for fractional iteration
lengths.
Fixes: #14858
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build(deps): bump gstreamer from 0.15.6 to 0.15.7
Bumps gstreamer from 0.15.6 to 0.15.7.
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This conversion can lead to floating point errors and extra work when
computing animations. Avoiding it allows animation-iteration-count-009.html
to pass.
This change also improves support for creating animations with negative
delays, as that is necessary to test support for fractional iteration
lengths.
This change also adjusts existing Servo animation tests which assumed
that advancing to the exact moment of the end of the animation would be
considered "before the end." With this change, this moment is "after the
end."
Fixes: #14858
build(deps): bump bzip2-sys from 0.1.7 to 0.1.9+1.0.8
Bumps [bzip2-sys](https://github.com/alexcrichton/bzip2-rs) from 0.1.7 to 0.1.9+1.0.8.
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build(deps): bump futures-executor from 0.3.4 to 0.3.5
Bumps [futures-executor](https://github.com/rust-lang/futures-rs) from 0.3.4 to 0.3.5.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/rust-lang/futures-rs/releases">futures-executor's releases</a>.</em></p>
<blockquote>
<h2>0.3.5</h2>
<ul>
<li>Added <code>StreamExt::flat_map</code>.</li>
<li>Added <code>StreamExt::ready_chunks</code>.</li>
<li>Added <code>*_unpin</code> methods to <code>SinkExt</code>.</li>
<li>Added a <code>cancellation()</code> future to <code>oneshot::Sender</code>.</li>
<li>Added <code>reunite</code> method to <code>ReadHalf</code> and <code>WriteHalf</code>.</li>
<li>Added <code>Extend</code> implementations for <code>Futures(Un)Ordered</code> and <code>SelectAll</code>.</li>
<li>Added support for reexporting the <code>join!</code> and <code>select!</code> macros.</li>
<li>Added <code>no_std</code> support for the <code>pending!</code> and <code>poll!</code> macros.</li>
<li>Added <code>Send</code> and <code>Sync</code> support for <code>AssertUnmoved</code>.</li>
<li>Fixed a bug where <code>Shared</code> wasn't relinquishing control to the executor.</li>
<li>Removed the <code>Send</code> bound on the output of <code>RemoteHandle</code>.</li>
<li>Relaxed bounds on <code>FuturesUnordered</code>.</li>
<li>Reorganized internal tests to work under different <code>--feature</code>s.</li>
<li>Reorganized the bounds on <code>StreamExt::forward</code>.</li>
<li>Removed and replaced a large amount of internal <code>unsafe</code>.</li>
</ul>
</blockquote>
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<p><em>Sourced from <a href="https://github.com/rust-lang/futures-rs/blob/master/CHANGELOG.md">futures-executor's changelog</a>.</em></p>
<blockquote>
<h1>0.3.5 - 2020-05-08</h1>
<ul>
<li>Added <code>StreamExt::flat_map</code>.</li>
<li>Added <code>StreamExt::ready_chunks</code>.</li>
<li>Added <code>*_unpin</code> methods to <code>SinkExt</code>.</li>
<li>Added a <code>cancellation()</code> future to <code>oneshot::Sender</code>.</li>
<li>Added <code>reunite</code> method to <code>ReadHalf</code> and <code>WriteHalf</code>.</li>
<li>Added <code>Extend</code> implementations for <code>Futures(Un)Ordered</code> and <code>SelectAll</code>.</li>
<li>Added support for reexporting the <code>join!</code> and <code>select!</code> macros.</li>
<li>Added <code>no_std</code> support for the <code>pending!</code> and <code>poll!</code> macros.</li>
<li>Added <code>Send</code> and <code>Sync</code> support for <code>AssertUnmoved</code>.</li>
<li>Fixed a bug where <code>Shared</code> wasn't relinquishing control to the executor.</li>
<li>Removed the <code>Send</code> bound on the output of <code>RemoteHandle</code>.</li>
<li>Relaxed bounds on <code>FuturesUnordered</code>.</li>
<li>Reorganized internal tests to work under different <code>--feature</code>s.</li>
<li>Reorganized the bounds on <code>StreamExt::forward</code>.</li>
<li>Removed and replaced a large amount of internal <code>unsafe</code>.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="4ceafb384c"><code>4ceafb3</code></a> Stage 0.3.5</li>
<li><a href="5b91728e10"><code>5b91728</code></a> Drop unneeded Send/Sync bound from AssertUnmoved</li>
<li><a href="4b930bb470"><code>4b930bb</code></a> Implement Send + Sync for AssertUnmoved</li>
<li><a href="3bf5ac99e9"><code>3bf5ac9</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/rust-lang/futures-rs/issues/2128">#2128</a> from Diggsey/snip</li>
<li><a href="1b44548be7"><code>1b44548</code></a> Merge branch 'master' into snip</li>
<li><a href="32005e3f74"><code>32005e3</code></a> fix: Shared must relinquish control to the executor if repolled</li>
<li><a href="dc06edaf54"><code>dc06eda</code></a> Update pin-utils to 0.1</li>
<li><a href="dc00793b38"><code>dc00793</code></a> Make ready and lazy's panic messages easy to understand</li>
<li><a href="127b244ecd"><code>127b244</code></a> Allow pending! and poll! in no_std</li>
<li><a href="dfc6673946"><code>dfc6673</code></a> Update futures-util/src/future/future/flatten.rs</li>
<li>Additional commits viewable in <a href="https://github.com/rust-lang/futures-rs/compare/0.3.4...0.3.5">compare view</a></li>
</ul>
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docs(README): update mac installation
<!-- Please describe your changes on the following line: -->
This clarifies the mac installation instructions.
---
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Update bincode, reduce code size of `script` by ~11%
… as measured in lines of unoptimized LLVM IR by
```
cargo llvm-lines --manifest-path ports/winit/Cargo.toml \
-p script --features layout-2013 | head -n 30
```
… with https://github.com/dtolnay/cargo-llvm-lines
CC https://github.com/servo/servo/issues/26713
One of the top functions (in lines contribution) was a `Visitor::visit_enum` method generated by `serde_derive` for deserializing `keyboard_types:🔑:Key`, which is an enum with many variants. I had filed https://github.com/serde-rs/serde/issues/1824 to discuss this, and dtolnay proposed https://github.com/pyfisch/keyboard-types/pull/6 manually implementing `Deserialize` for that enum instead of deriving it.
However another point of note is that this function had four copies with monomorphization. I could reproduce this in a program that does nothing but deserialize an enum with bincode: https://github.com/serde-rs/serde/issues/1824#issuecomment-641244476 This suggests that bincode uses instanciates the `Deserialize` impls with four different `Deserializer` types which is three more than necessary.
https://dos.cafe/blog/bincode-1.3.html mentions changes to `Deserializer` types in a new version of bincode. And sure enough, this issue is now fixed.
Before:
```
Lines Copies Function name
----- ------ -------------
7022161 (100%) 180367 (100%) (TOTAL)
178816 (2.5%) 15437 (8.6%) core::ptr::drop_in_place
151022 (2.2%) 6634 (3.7%) core::ops::function::FnOnce::call_once
122012 (1.7%) 1000 (0.6%) <<&mut bincode:🇩🇪:Deserializer<R,O> as serde:🇩🇪:Deserializer>::deserialize_tuple::Access<R,O> as serde:🇩🇪:SeqAccess>::next_element_seed
101731 (1.4%) 1627 (0.9%) core::option::Option<T>::map
83196 (1.2%) 1192 (0.7%) core::result::Result<T,E>::map
51215 (0.7%) 6111 (3.4%) core::ops::function::FnOnce::call_once{{vtable.shim}}
47048 (0.7%) 4 (0.0%) <keyboard_types:🔑:_IMPL_DESERIALIZE_FOR_Key::<impl serde:🇩🇪:Deserialize for keyboard_types:🔑:Key>::deserialize::__Visitor as serde:🇩🇪:Visitor>::visit_enum
45388 (0.6%) 296 (0.2%) <&mut bincode:🇩🇪:Deserializer<R,O> as serde:🇩🇪:Deserializer>::deserialize_enum::<impl serde:🇩🇪:EnumAccess for &mut bincode:🇩🇪:Deserializer<R,O>>::variant_seed
44973 (0.6%) 647 (0.4%) core::result::Result<T,E>::map_err
39185 (0.6%) 516 (0.3%) std:🧵:local::LocalKey<T>::try_with
39130 (0.6%) 215 (0.1%) alloc::raw_vec::RawVec<T,A>::grow_amortized
35334 (0.5%) 867 (0.5%) alloc::alloc::box_free
34788 (0.5%) 609 (0.3%) crossbeam_channel::context::Context::with::{{closure}}
33810 (0.5%) 646 (0.4%) core::ptr::swap_nonoverlapping_one
33610 (0.5%) 552 (0.3%) core::result::Result<T,E>::unwrap_or_else
32144 (0.5%) 392 (0.2%) <*const T as core::fmt::Pointer>::fmt
32062 (0.5%) 782 (0.4%) script::dom::bindings::root::Root<T>::new
31589 (0.4%) 600 (0.3%) core::result::Result<T,E>::expect
29364 (0.4%) 116 (0.1%) <<script_traits::webdriver_msg::_IMPL_DESERIALIZE_FOR_WebDriverScriptCommand::<impl serde:🇩🇪:Deserialize for script_traits::webdriver_msg::WebDriverScriptCommand>::deserialize::__Visitor as serde:🇩🇪:Visitor>::visit_enum::__Visitor as serde:🇩🇪:Visitor>::visit_seq
26996 (0.4%) 346 (0.2%) core::option::Option<T>::map_or
26168 (0.4%) 92 (0.1%) <<script_traits::_IMPL_DESERIALIZE_FOR_ConstellationControlMsg::<impl serde:🇩🇪:Deserialize for script_traits::ConstellationControlMsg>::deserialize::__Visitor as serde:🇩🇪:Visitor>::visit_enum::__Visitor as serde:🇩🇪:Visitor>::visit_seq
25996 (0.4%) 388 (0.2%) script::dom::bindings::root::Root<script::dom::bindings::root::MaybeUnreflectedDom<T>>::reflect_with
25833 (0.4%) 641 (0.4%) core::result::Result<T,E>::unwrap
25180 (0.4%) 4 (0.0%) <keyboard_types::code::_IMPL_DESERIALIZE_FOR_Code::<impl serde:🇩🇪:Deserialize for keyboard_types::code::Code>::deserialize::__Visitor as serde:🇩🇪:Visitor>::visit_enum
24751 (0.4%) 197 (0.1%) core::iter::traits::iterator::Iterator::try_fold
22216 (0.3%) 376 (0.2%) bincode::internal::deserialize_seed
22185 (0.3%) 145 (0.1%) hashbrown::raw::RawTable<T>::find
```
After:
```
Lines Copies Function name
----- ------ -------------
6239581 (100%) 169803 (100%) (TOTAL)
178770 (2.9%) 15434 (9.1%) core::ptr::drop_in_place
151022 (2.4%) 6634 (3.9%) core::ops::function::FnOnce::call_once
101146 (1.6%) 1618 (1.0%) core::option::Option<T>::map
76938 (1.2%) 1090 (0.6%) core::result::Result<T,E>::map
51215 (0.8%) 6111 (3.6%) core::ops::function::FnOnce::call_once{{vtable.shim}}
44973 (0.7%) 647 (0.4%) core::result::Result<T,E>::map_err
39185 (0.6%) 516 (0.3%) std:🧵:local::LocalKey<T>::try_with
39130 (0.6%) 215 (0.1%) alloc::raw_vec::RawVec<T,A>::grow_amortized
35334 (0.6%) 867 (0.5%) alloc::alloc::box_free
34788 (0.6%) 609 (0.4%) crossbeam_channel::context::Context::with::{{closure}}
33810 (0.5%) 646 (0.4%) core::ptr::swap_nonoverlapping_one
33610 (0.5%) 552 (0.3%) core::result::Result<T,E>::unwrap_or_else
32144 (0.5%) 392 (0.2%) <*const T as core::fmt::Pointer>::fmt
32062 (0.5%) 782 (0.5%) script::dom::bindings::root::Root<T>::new
31589 (0.5%) 600 (0.4%) core::result::Result<T,E>::expect
30069 (0.5%) 250 (0.1%) <<&mut bincode:🇩🇪:Deserializer<R,O> as serde:🇩🇪:Deserializer>::deserialize_tuple::Access<R,O> as serde:🇩🇪:SeqAccess>::next_element_seed
26996 (0.4%) 346 (0.2%) core::option::Option<T>::map_or
25996 (0.4%) 388 (0.2%) script::dom::bindings::root::Root<script::dom::bindings::root::MaybeUnreflectedDom<T>>::reflect_with
25833 (0.4%) 641 (0.4%) core::result::Result<T,E>::unwrap
24751 (0.4%) 197 (0.1%) core::iter::traits::iterator::Iterator::try_fold
22185 (0.4%) 145 (0.1%) hashbrown::raw::RawTable<T>::find
22000 (0.4%) 80 (0.0%) hashbrown::raw::RawTable<T>::rehash_in_place
20808 (0.3%) 289 (0.2%) core::alloc::layout::Layout::array
20031 (0.3%) 308 (0.2%) core::option::Option<T>::ok_or_else
19732 (0.3%) 2 (0.0%) html5ever::tree_builder::TreeBuilder<Handle,Sink>::step
18951 (0.3%) 1014 (0.6%) core::ptr::read
17261 (0.3%) 201 (0.1%) core::iter::traits::iterator::Iterator::fold
```
That `visit_enum` for `Key` is not in the first 30 lines, I find it after changing the filtering command to `head -n 60`:
```
11762 (0.2%) 1 (0.0%) <keyboard_types:🔑:_IMPL_DESERIALIZE_FOR_Key::<impl serde:🇩🇪:Deserialize for keyboard_types:🔑:Key>::deserialize::__Visitor as serde:🇩🇪:Visitor>::visit_enum
```
It has one copy / instantiation instead of four, and contributes exactly four times fewer lines of IR.
The crate total reduced by ~782k lines, a lot more than ~35k for this `visit_enum` function. We also see that `next_element_seed` (also for bincode deserialization) now has 250 copies instead of 1000. So it looks like *everything* bincode-related was reduced by 4×
… as measured in lines of unoptimized LLVM IR by
```
cargo llvm-lines --manifest-path ports/winit/Cargo.toml \
-p script --features layout-2013 | head -n 30
```
… with https://github.com/dtolnay/cargo-llvm-lines
CC https://github.com/servo/servo/issues/26713
One of the top functions (in lines contribution) was a
`Visitor::visit_enum` method generated by `serde_derive` for deserializing
`keyboard_types:🔑:Key`, which is an enum with many variants.
I had filed https://github.com/serde-rs/serde/issues/1824 to discuss this,
and dtolnay proposed https://github.com/pyfisch/keyboard-types/pull/6
manually implementing `Deserialize` for that enum instead of deriving it.
However another point of note is that this function had four copies with
monomorphization. I could reproduce this in a program that does nothing
but deserialize an enum with bincode:
https://github.com/serde-rs/serde/issues/1824#issuecomment-641244476
This suggests that bincode uses instanciates the `Deserialize` impls
with four different `Deserializer` types which is three more than necessary.
https://dos.cafe/blog/bincode-1.3.html mentions changes to `Deserializer`
types in a new version of bincode. And sure enough, this issue is now fixed.
Before:
```
Lines Copies Function name
----- ------ -------------
7022161 (100%) 180367 (100%) (TOTAL)
178816 (2.5%) 15437 (8.6%) core::ptr::drop_in_place
151022 (2.2%) 6634 (3.7%) core::ops::function::FnOnce::call_once
122012 (1.7%) 1000 (0.6%) <<&mut bincode:🇩🇪:Deserializer<R,O> as serde:🇩🇪:Deserializer>::deserialize_tuple::Access<R,O> as serde:🇩🇪:SeqAccess>::next_element_seed
101731 (1.4%) 1627 (0.9%) core::option::Option<T>::map
83196 (1.2%) 1192 (0.7%) core::result::Result<T,E>::map
51215 (0.7%) 6111 (3.4%) core::ops::function::FnOnce::call_once{{vtable.shim}}
47048 (0.7%) 4 (0.0%) <keyboard_types:🔑:_IMPL_DESERIALIZE_FOR_Key::<impl serde:🇩🇪:Deserialize for keyboard_types:🔑:Key>::deserialize::__Visitor as serde:🇩🇪:Visitor>::visit_enum
45388 (0.6%) 296 (0.2%) <&mut bincode:🇩🇪:Deserializer<R,O> as serde:🇩🇪:Deserializer>::deserialize_enum::<impl serde:🇩🇪:EnumAccess for &mut bincode:🇩🇪:Deserializer<R,O>>::variant_seed
44973 (0.6%) 647 (0.4%) core::result::Result<T,E>::map_err
39185 (0.6%) 516 (0.3%) std:🧵:local::LocalKey<T>::try_with
39130 (0.6%) 215 (0.1%) alloc::raw_vec::RawVec<T,A>::grow_amortized
35334 (0.5%) 867 (0.5%) alloc::alloc::box_free
34788 (0.5%) 609 (0.3%) crossbeam_channel::context::Context::with::{{closure}}
33810 (0.5%) 646 (0.4%) core::ptr::swap_nonoverlapping_one
33610 (0.5%) 552 (0.3%) core::result::Result<T,E>::unwrap_or_else
32144 (0.5%) 392 (0.2%) <*const T as core::fmt::Pointer>::fmt
32062 (0.5%) 782 (0.4%) script::dom::bindings::root::Root<T>::new
31589 (0.4%) 600 (0.3%) core::result::Result<T,E>::expect
29364 (0.4%) 116 (0.1%) <<script_traits::webdriver_msg::_IMPL_DESERIALIZE_FOR_WebDriverScriptCommand::<impl serde:🇩🇪:Deserialize for script_traits::webdriver_msg::WebDriverScriptCommand>::deserialize::__Visitor as serde:🇩🇪:Visitor>::visit_enum::__Visitor as serde:🇩🇪:Visitor>::visit_seq
26996 (0.4%) 346 (0.2%) core::option::Option<T>::map_or
26168 (0.4%) 92 (0.1%) <<script_traits::_IMPL_DESERIALIZE_FOR_ConstellationControlMsg::<impl serde:🇩🇪:Deserialize for script_traits::ConstellationControlMsg>::deserialize::__Visitor as serde:🇩🇪:Visitor>::visit_enum::__Visitor as serde:🇩🇪:Visitor>::visit_seq
25996 (0.4%) 388 (0.2%) script::dom::bindings::root::Root<script::dom::bindings::root::MaybeUnreflectedDom<T>>::reflect_with
25833 (0.4%) 641 (0.4%) core::result::Result<T,E>::unwrap
25180 (0.4%) 4 (0.0%) <keyboard_types::code::_IMPL_DESERIALIZE_FOR_Code::<impl serde:🇩🇪:Deserialize for keyboard_types::code::Code>::deserialize::__Visitor as serde:🇩🇪:Visitor>::visit_enum
24751 (0.4%) 197 (0.1%) core::iter::traits::iterator::Iterator::try_fold
22216 (0.3%) 376 (0.2%) bincode::internal::deserialize_seed
22185 (0.3%) 145 (0.1%) hashbrown::raw::RawTable<T>::find
```
After:
```
Lines Copies Function name
----- ------ -------------
6239581 (100%) 169803 (100%) (TOTAL)
178770 (2.9%) 15434 (9.1%) core::ptr::drop_in_place
151022 (2.4%) 6634 (3.9%) core::ops::function::FnOnce::call_once
101146 (1.6%) 1618 (1.0%) core::option::Option<T>::map
76938 (1.2%) 1090 (0.6%) core::result::Result<T,E>::map
51215 (0.8%) 6111 (3.6%) core::ops::function::FnOnce::call_once{{vtable.shim}}
44973 (0.7%) 647 (0.4%) core::result::Result<T,E>::map_err
39185 (0.6%) 516 (0.3%) std:🧵:local::LocalKey<T>::try_with
39130 (0.6%) 215 (0.1%) alloc::raw_vec::RawVec<T,A>::grow_amortized
35334 (0.6%) 867 (0.5%) alloc::alloc::box_free
34788 (0.6%) 609 (0.4%) crossbeam_channel::context::Context::with::{{closure}}
33810 (0.5%) 646 (0.4%) core::ptr::swap_nonoverlapping_one
33610 (0.5%) 552 (0.3%) core::result::Result<T,E>::unwrap_or_else
32144 (0.5%) 392 (0.2%) <*const T as core::fmt::Pointer>::fmt
32062 (0.5%) 782 (0.5%) script::dom::bindings::root::Root<T>::new
31589 (0.5%) 600 (0.4%) core::result::Result<T,E>::expect
30069 (0.5%) 250 (0.1%) <<&mut bincode:🇩🇪:Deserializer<R,O> as serde:🇩🇪:Deserializer>::deserialize_tuple::Access<R,O> as serde:🇩🇪:SeqAccess>::next_element_seed
26996 (0.4%) 346 (0.2%) core::option::Option<T>::map_or
25996 (0.4%) 388 (0.2%) script::dom::bindings::root::Root<script::dom::bindings::root::MaybeUnreflectedDom<T>>::reflect_with
25833 (0.4%) 641 (0.4%) core::result::Result<T,E>::unwrap
24751 (0.4%) 197 (0.1%) core::iter::traits::iterator::Iterator::try_fold
22185 (0.4%) 145 (0.1%) hashbrown::raw::RawTable<T>::find
22000 (0.4%) 80 (0.0%) hashbrown::raw::RawTable<T>::rehash_in_place
20808 (0.3%) 289 (0.2%) core::alloc::layout::Layout::array
20031 (0.3%) 308 (0.2%) core::option::Option<T>::ok_or_else
19732 (0.3%) 2 (0.0%) html5ever::tree_builder::TreeBuilder<Handle,Sink>::step
18951 (0.3%) 1014 (0.6%) core::ptr::read
17261 (0.3%) 201 (0.1%) core::iter::traits::iterator::Iterator::fold
```
That `visit_enum` for `Key` is not in the first 30 lines, I find it after
changing the filtering command to `head -n 60`:
```
11762 (0.2%) 1 (0.0%) <keyboard_types:🔑:_IMPL_DESERIALIZE_FOR_Key::<impl serde:🇩🇪:Deserialize for keyboard_types:🔑:Key>::deserialize::__Visitor as serde:🇩🇪:Visitor>::visit_enum
```
It has one copy / instantiation instead of four, which contributes exactly
four times fewer lines of IR.
The crate total reduced by ~782k lines, a lot more than ~35k for this
`visit_enum` function. We see that `next_element_seed` (also for bincode
deserialization) now has 250 copies instead of 1000. So it looks like
*everything* bincode related was reduced by 4×
