Adding upstream version 115.8.0esr.upstream/115.8.0esr

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

5 files changed, 581 insertions, 0 deletions

diff --git a/gfx/wr/peek-poke/peek-poke-derive/Cargo.toml b/gfx/wr/peek-poke/peek-poke-derive/Cargo.toml
new file mode 100644
index 0000000000..491e0d95ae
--- /dev/null
+++ b/gfx/wr/peek-poke/peek-poke-derive/Cargo.toml
@@ -0,0 +1,19 @@
+[package]
+name = "peek-poke-derive"
+version = "0.3.0"
+authors = ["Dan Glastonbury <dan.glastonbury@gmail.com>"]
+repository = "https://github.com/servo/webrender"
+description = "Derive macro for peek-poke."
+license = "MIT/Apache-2.0"
+edition = "2018"
+
+[lib]
+doctest = false
+proc-macro = true
+
+[dependencies]
+proc-macro2 = "1"
+quote = "1"
+syn = "1"
+synstructure = "0.12"
+unicode-xid = "0.2"
diff --git a/gfx/wr/peek-poke/peek-poke-derive/LICENSE-APACHE b/gfx/wr/peek-poke/peek-poke-derive/LICENSE-APACHE
new file mode 100644
index 0000000000..16fe87b06e
--- /dev/null
+++ b/gfx/wr/peek-poke/peek-poke-derive/LICENSE-APACHE
@@ -0,0 +1,201 @@
+                              Apache License
+                        Version 2.0, January 2004
+                     http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
+
+   "License" shall mean the terms and conditions for use, reproduction,
+   and distribution as defined by Sections 1 through 9 of this document.
+
+   "Licensor" shall mean the copyright owner or entity authorized by
+   the copyright owner that is granting the License.
+
+   "Legal Entity" shall mean the union of the acting entity and all
+   other entities that control, are controlled by, or are under common
+   control with that entity. For the purposes of this definition,
+   "control" means (i) the power, direct or indirect, to cause the
+   direction or management of such entity, whether by contract or
+   otherwise, or (ii) ownership of fifty percent (50%) or more of the
+   outstanding shares, or (iii) beneficial ownership of such entity.
+
+   "You" (or "Your") shall mean an individual or Legal Entity
+   exercising permissions granted by this License.
+
+   "Source" form shall mean the preferred form for making modifications,
+   including but not limited to software source code, documentation
+   source, and configuration files.
+
+   "Object" form shall mean any form resulting from mechanical
+   transformation or translation of a Source form, including but
+   not limited to compiled object code, generated documentation,
+   and conversions to other media types.
+
+   "Work" shall mean the work of authorship, whether in Source or
+   Object form, made available under the License, as indicated by a
+   copyright notice that is included in or attached to the work
+   (an example is provided in the Appendix below).
+
+   "Derivative Works" shall mean any work, whether in Source or Object
+   form, that is based on (or derived from) the Work and for which the
+   editorial revisions, annotations, elaborations, or other modifications
+   represent, as a whole, an original work of authorship. For the purposes
+   of this License, Derivative Works shall not include works that remain
+   separable from, or merely link (or bind by name) to the interfaces of,
+   the Work and Derivative Works thereof.
+
+   "Contribution" shall mean any work of authorship, including
+   the original version of the Work and any modifications or additions
+   to that Work or Derivative Works thereof, that is intentionally
+   submitted to Licensor for inclusion in the Work by the copyright owner
+   or by an individual or Legal Entity authorized to submit on behalf of
+   the copyright owner. For the purposes of this definition, "submitted"
+   means any form of electronic, verbal, or written communication sent
+   to the Licensor or its representatives, including but not limited to
+   communication on electronic mailing lists, source code control systems,
+   and issue tracking systems that are managed by, or on behalf of, the
+   Licensor for the purpose of discussing and improving the Work, but
+   excluding communication that is conspicuously marked or otherwise
+   designated in writing by the copyright owner as "Not a Contribution."
+
+   "Contributor" shall mean Licensor and any individual or Legal Entity
+   on behalf of whom a Contribution has been received by Licensor and
+   subsequently incorporated within the Work.
+
+2. Grant of Copyright License. Subject to the terms and conditions of
+   this License, each Contributor hereby grants to You a perpetual,
+   worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+   copyright license to reproduce, prepare Derivative Works of,
+   publicly display, publicly perform, sublicense, and distribute the
+   Work and such Derivative Works in Source or Object form.
+
+3. Grant of Patent License. Subject to the terms and conditions of
+   this License, each Contributor hereby grants to You a perpetual,
+   worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+   (except as stated in this section) patent license to make, have made,
+   use, offer to sell, sell, import, and otherwise transfer the Work,
+   where such license applies only to those patent claims licensable
+   by such Contributor that are necessarily infringed by their
+   Contribution(s) alone or by combination of their Contribution(s)
+   with the Work to which such Contribution(s) was submitted. If You
+   institute patent litigation against any entity (including a
+   cross-claim or counterclaim in a lawsuit) alleging that the Work
+   or a Contribution incorporated within the Work constitutes direct
+   or contributory patent infringement, then any patent licenses
+   granted to You under this License for that Work shall terminate
+   as of the date such litigation is filed.
+
+4. Redistribution. You may reproduce and distribute copies of the
+   Work or Derivative Works thereof in any medium, with or without
+   modifications, and in Source or Object form, provided that You
+   meet the following conditions:
+
+   (a) You must give any other recipients of the Work or
+       Derivative Works a copy of this License; and
+
+   (b) You must cause any modified files to carry prominent notices
+       stating that You changed the files; and
+
+   (c) You must retain, in the Source form of any Derivative Works
+       that You distribute, all copyright, patent, trademark, and
+       attribution notices from the Source form of the Work,
+       excluding those notices that do not pertain to any part of
+       the Derivative Works; and
+
+   (d) If the Work includes a "NOTICE" text file as part of its
+       distribution, then any Derivative Works that You distribute must
+       include a readable copy of the attribution notices contained
+       within such NOTICE file, excluding those notices that do not
+       pertain to any part of the Derivative Works, in at least one
+       of the following places: within a NOTICE text file distributed
+       as part of the Derivative Works; within the Source form or
+       documentation, if provided along with the Derivative Works; or,
+       within a display generated by the Derivative Works, if and
+       wherever such third-party notices normally appear. The contents
+       of the NOTICE file are for informational purposes only and
+       do not modify the License. You may add Your own attribution
+       notices within Derivative Works that You distribute, alongside
+       or as an addendum to the NOTICE text from the Work, provided
+       that such additional attribution notices cannot be construed
+       as modifying the License.
+
+   You may add Your own copyright statement to Your modifications and
+   may provide additional or different license terms and conditions
+   for use, reproduction, or distribution of Your modifications, or
+   for any such Derivative Works as a whole, provided Your use,
+   reproduction, and distribution of the Work otherwise complies with
+   the conditions stated in this License.
+
+5. Submission of Contributions. Unless You explicitly state otherwise,
+   any Contribution intentionally submitted for inclusion in the Work
+   by You to the Licensor shall be under the terms and conditions of
+   this License, without any additional terms or conditions.
+   Notwithstanding the above, nothing herein shall supersede or modify
+   the terms of any separate license agreement you may have executed
+   with Licensor regarding such Contributions.
+
+6. Trademarks. This License does not grant permission to use the trade
+   names, trademarks, service marks, or product names of the Licensor,
+   except as required for reasonable and customary use in describing the
+   origin of the Work and reproducing the content of the NOTICE file.
+
+7. Disclaimer of Warranty. Unless required by applicable law or
+   agreed to in writing, Licensor provides the Work (and each
+   Contributor provides its Contributions) on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+   implied, including, without limitation, any warranties or conditions
+   of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+   PARTICULAR PURPOSE. You are solely responsible for determining the
+   appropriateness of using or redistributing the Work and assume any
+   risks associated with Your exercise of permissions under this License.
+
+8. Limitation of Liability. In no event and under no legal theory,
+   whether in tort (including negligence), contract, or otherwise,
+   unless required by applicable law (such as deliberate and grossly
+   negligent acts) or agreed to in writing, shall any Contributor be
+   liable to You for damages, including any direct, indirect, special,
+   incidental, or consequential damages of any character arising as a
+   result of this License or out of the use or inability to use the
+   Work (including but not limited to damages for loss of goodwill,
+   work stoppage, computer failure or malfunction, or any and all
+   other commercial damages or losses), even if such Contributor
+   has been advised of the possibility of such damages.
+
+9. Accepting Warranty or Additional Liability. While redistributing
+   the Work or Derivative Works thereof, You may choose to offer,
+   and charge a fee for, acceptance of support, warranty, indemnity,
+   or other liability obligations and/or rights consistent with this
+   License. However, in accepting such obligations, You may act only
+   on Your own behalf and on Your sole responsibility, not on behalf
+   of any other Contributor, and only if You agree to indemnify,
+   defend, and hold each Contributor harmless for any liability
+   incurred by, or claims asserted against, such Contributor by reason
+   of your accepting any such warranty or additional liability.
+
+END OF TERMS AND CONDITIONS
+
+APPENDIX: How to apply the Apache License to your work.
+
+   To apply the Apache License to your work, attach the following
+   boilerplate notice, with the fields enclosed by brackets "[]"
+   replaced with your own identifying information. (Don't include
+   the brackets!)  The text should be enclosed in the appropriate
+   comment syntax for the file format. We also recommend that a
+   file or class name and description of purpose be included on the
+   same "printed page" as the copyright notice for easier
+   identification within third-party archives.
+
+Copyright [yyyy] [name of copyright owner]
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+	http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
diff --git a/gfx/wr/peek-poke/peek-poke-derive/LICENSE-MIT b/gfx/wr/peek-poke/peek-poke-derive/LICENSE-MIT
new file mode 100644
index 0000000000..110bb34712
--- /dev/null
+++ b/gfx/wr/peek-poke/peek-poke-derive/LICENSE-MIT
@@ -0,0 +1,44 @@
+MIT License
+
+Copyright (c) 2019 Daniel Glastonbury
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of 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 ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+This work incorporates work covered by the following copyright and permission
+notice:
+
+Copyright (c) 2019 Devashish Dixit
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of 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 ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/gfx/wr/peek-poke/peek-poke-derive/README.md b/gfx/wr/peek-poke/peek-poke-derive/README.md
new file mode 100644
index 0000000000..1c379aa121
--- /dev/null
+++ b/gfx/wr/peek-poke/peek-poke-derive/README.md
@@ -0,0 +1,54 @@
+# Peeks, Pokes, and Pointers
+
+Peek from and poke structures into byte slices.
+
+## Benchmark
+
+Below are the benchmark results of comparison between `peek-poke` and `bincode` serializing and deserializing same `struct`:
+```
+struct MyPeekPokeStruct {
+    a: u8,
+    b: u16,
+    c: MyPeekPokeEnum,
+    d: Option<usize>,
+}
+
+enum MyPeekPokeEnum {
+    Variant1,
+    Variant2(u16),
+}
+```
+
+```
+Benchmarking struct::serialize/peek_poke::poke_into: Collecting 100 samples in                                                                                struct::serialize/peek_poke::poke_into
+                        time:   [2.7267 ns 2.7321 ns 2.7380 ns]
+
+Benchmarking struct::serialize/bincode::serialize: Collecting 100 samples in est                                                                                struct::serialize/bincode::serialize
+                        time:   [31.264 ns 31.326 ns 31.389 ns]
+
+Benchmarking struct::deserialize/peek_poke::peek_from: Collecting 100 samples                                                                                 struct::deserialize/peek_poke::peek_from
+                        time:   [5.3544 ns 5.3672 ns 5.3817 ns]
+
+Benchmarking struct::deserialize/bincode::deserialize: Collecting 100 samples in                                                                                struct::deserialize/bincode::deserialize
+                        time:   [25.155 ns 26.439 ns 27.661 ns]
+```
+
+You can run benchmarks by running following command:
+```
+cargo bench
+```
+
+## License
+[license]: #license
+
+Licensed under either of
+- Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
+- MIT license (http://opensource.org/licenses/MIT)
+
+at your option.
+
+see [LICENSE-APACHE](LICENSE-APACHE), [LICENSE-MIT](LICENSE-MIT) for details.
+
+## Contribution
+Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as
+defined in the Apache-2.0 license, shall be dual licensed as about, without any additional terms or conditions.
diff --git a/gfx/wr/peek-poke/peek-poke-derive/src/lib.rs b/gfx/wr/peek-poke/peek-poke-derive/src/lib.rs
new file mode 100644
index 0000000000..ac20b2b922
--- /dev/null
+++ b/gfx/wr/peek-poke/peek-poke-derive/src/lib.rs
@@ -0,0 +1,263 @@
+// Copyright 2019 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.
+
+use proc_macro2::{Span, TokenStream};
+use quote::quote;
+use syn::{Ident, Index, TraitBound};
+use synstructure::{decl_derive, Structure, BindStyle, AddBounds};
+use unicode_xid::UnicodeXID;
+
+// Internal method for sanitizing an identifier for hygiene purposes.
+fn sanitize_ident(s: &str) -> Ident {
+    let mut res = String::with_capacity(s.len());
+    for mut c in s.chars() {
+        if !UnicodeXID::is_xid_continue(c) {
+            c = '_'
+        }
+        // Deduplicate consecutive _ characters.
+        if res.ends_with('_') && c == '_' {
+            continue;
+        }
+        res.push(c);
+    }
+    Ident::new(&res, Span::call_site())
+}
+
+/// Calculates size type for number of variants (used for enums)
+fn get_discriminant_size_type(len: usize) -> TokenStream {
+    if len <= <u8>::max_value() as usize {
+        quote! { u8 }
+    } else if len <= <u16>::max_value() as usize {
+        quote! { u16 }
+    } else {
+        quote! { u32 }
+    }
+}
+
+fn is_struct(s: &Structure) -> bool {
+    // a single variant with no prefix is 'struct'
+    matches!(&s.variants()[..], [v] if v.prefix.is_none())
+}
+
+fn derive_max_size(s: &Structure) -> TokenStream {
+    let max_size = s.variants().iter().fold(quote!(0), |acc, vi| {
+        let variant_size = vi.bindings().iter().fold(quote!(0), |acc, bi| {
+            // compute size of each variant by summing the sizes of its bindings
+            let ty = &bi.ast().ty;
+            quote!(#acc + <#ty>::max_size())
+        });
+
+        // find the maximum of each variant
+        quote! {
+            max(#acc, #variant_size)
+        }
+    });
+
+    let body = if is_struct(s) {
+        max_size
+    } else {
+        let discriminant_size_type = get_discriminant_size_type(s.variants().len());
+        quote! {
+            #discriminant_size_type ::max_size() + #max_size
+        }
+    };
+
+    quote! {
+        #[inline(always)]
+        fn max_size() -> usize {
+            use std::cmp::max;
+            #body
+        }
+    }
+}
+
+fn derive_peek_from_for_enum(s: &mut Structure) -> TokenStream {
+    assert!(!is_struct(s));
+    s.bind_with(|_| BindStyle::Move);
+
+    let num_variants = s.variants().len();
+    let discriminant_size_type = get_discriminant_size_type(num_variants);
+    let body = s
+        .variants()
+        .iter()
+        .enumerate()
+        .fold(quote!(), |acc, (i, vi)| {
+            let bindings = vi
+                .bindings()
+                .iter()
+                .map(|bi| quote!(#bi))
+                .collect::<Vec<_>>();
+
+            let variant_pat = Index::from(i);
+            let poke_exprs = bindings.iter().fold(quote!(), |acc, bi| {
+                quote! {
+                    #acc
+                    let (#bi, bytes) = peek_poke::peek_from_default(bytes);
+                }
+            });
+            let construct = vi.construct(|_, i| {
+                let bi = &bindings[i];
+                quote!(#bi)
+            });
+
+            quote! {
+                #acc
+                #variant_pat => {
+                    #poke_exprs
+                    *output = #construct;
+                    bytes
+                }
+            }
+        });
+
+    let type_name = s.ast().ident.to_string();
+    let max_tag_value = num_variants - 1;
+
+    quote! {
+        #[inline(always)]
+        unsafe fn peek_from(bytes: *const u8, output: *mut Self) -> *const u8 {
+            let (variant, bytes) = peek_poke::peek_from_default::<#discriminant_size_type>(bytes);
+            match variant {
+                #body
+                out_of_range_tag => {
+                    panic!("WRDL: memory corruption detected while parsing {} - enum tag should be <= {}, but was {}",
+                        #type_name, #max_tag_value, out_of_range_tag);
+                }
+            }
+        }
+    }
+}
+
+fn derive_peek_from_for_struct(s: &mut Structure) -> TokenStream {
+    assert!(is_struct(&s));
+
+    s.variants_mut()[0].bind_with(|_| BindStyle::RefMut);
+    let pat = s.variants()[0].pat();
+    let peek_exprs = s.variants()[0].bindings().iter().fold(quote!(), |acc, bi| {
+        let ty = &bi.ast().ty;
+        quote! {
+            #acc
+            let bytes = <#ty>::peek_from(bytes, #bi);
+        }
+    });
+
+    let body = quote! {
+        #pat => {
+            #peek_exprs
+            bytes
+        }
+    };
+
+    quote! {
+        #[inline(always)]
+        unsafe fn peek_from(bytes: *const u8, output: *mut Self) -> *const u8 {
+            match &mut (*output) {
+                #body
+            }
+        }
+    }
+}
+
+fn derive_poke_into(s: &Structure) -> TokenStream {
+    let is_struct = is_struct(&s);
+    let discriminant_size_type = get_discriminant_size_type(s.variants().len());
+    let body = s
+        .variants()
+        .iter()
+        .enumerate()
+        .fold(quote!(), |acc, (i, vi)| {
+            let init = if !is_struct {
+                let index = Index::from(i);
+                quote! {
+                    let bytes = #discriminant_size_type::poke_into(&#index, bytes);
+                }
+            } else {
+                quote!()
+            };
+            let variant_pat = vi.pat();
+            let poke_exprs = vi.bindings().iter().fold(init, |acc, bi| {
+                quote! {
+                    #acc
+                    let bytes = #bi.poke_into(bytes);
+                }
+            });
+
+            quote! {
+                #acc
+                #variant_pat => {
+                    #poke_exprs
+                    bytes
+                }
+            }
+        });
+
+    quote! {
+        #[inline(always)]
+        unsafe fn poke_into(&self, bytes: *mut u8) -> *mut u8 {
+            match &*self {
+                #body
+            }
+        }
+    }
+}
+
+fn peek_poke_derive(mut s: Structure) -> TokenStream {
+    s.binding_name(|_, i| Ident::new(&format!("__self_{}", i), Span::call_site()));
+
+    let max_size_fn = derive_max_size(&s);
+    let poke_into_fn = derive_poke_into(&s);
+    let peek_from_fn = if is_struct(&s) {
+        derive_peek_from_for_struct(&mut s)
+    } else {
+        derive_peek_from_for_enum(&mut s)
+    };
+
+    let poke_impl = s.gen_impl(quote! {
+        extern crate peek_poke;
+
+        gen unsafe impl peek_poke::Poke for @Self {
+            #max_size_fn
+            #poke_into_fn
+        }
+    });
+
+    // To implement `fn peek_from` we require that types implement `Default`
+    // trait to create temporary values. This code does the addition all
+    // manually until https://github.com/mystor/synstructure/issues/24 is fixed.
+    let default_trait = syn::parse_str::<TraitBound>("::std::default::Default").unwrap();
+    let peek_trait = syn::parse_str::<TraitBound>("peek_poke::Peek").unwrap();
+
+    let ast = s.ast();
+    let name = &ast.ident;
+    let (impl_generics, ty_generics, where_clause) = ast.generics.split_for_impl();
+    let mut where_clause = where_clause.cloned();
+    s.add_trait_bounds(&default_trait, &mut where_clause, AddBounds::Generics);
+    s.add_trait_bounds(&peek_trait, &mut where_clause, AddBounds::Generics);
+
+    let dummy_const: Ident = sanitize_ident(&format!("_DERIVE_peek_poke_Peek_FOR_{}", name));
+
+    let peek_impl = quote! {
+        #[allow(non_upper_case_globals)]
+        const #dummy_const: () = {
+            extern crate peek_poke;
+
+            impl #impl_generics peek_poke::Peek for #name #ty_generics #where_clause {
+                #peek_from_fn
+            }
+        };
+    };
+
+    quote! {
+        #poke_impl
+        #peek_impl
+    }
+}
+
+decl_derive!([PeekPoke] => peek_poke_derive);