Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

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

3 files changed, 255 insertions, 0 deletions

diff --git a/third_party/rust/build-parallel/.cargo-checksum.json b/third_party/rust/build-parallel/.cargo-checksum.json
new file mode 100644
index 0000000000..0aaffc9bc5
--- /dev/null
+++ b/third_party/rust/build-parallel/.cargo-checksum.json
@@ -0,0 +1 @@
+{"files":{"Cargo.toml":"b4a0a0ab788e6823f07a15a777ecfa23d6353a73620451b8db943cc3138e8e48","src/lib.rs":"3f3bbc7e3cb00c52db8cb4ba829808e36e92f711af4dff9d5f8546c9e26fe0a5"},"package":"b8e3ff9db740167616e528c509b3618046fc05d337f8f3182d300f4aa977d2bb"}
\ No newline at end of file
diff --git a/third_party/rust/build-parallel/Cargo.toml b/third_party/rust/build-parallel/Cargo.toml
new file mode 100644
index 0000000000..fe5c5b7f88
--- /dev/null
+++ b/third_party/rust/build-parallel/Cargo.toml
@@ -0,0 +1,31 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies
+#
+# If you believe there's an error in this file please file an
+# issue against the rust-lang/cargo repository. If you're
+# editing this file be aware that the upstream Cargo.toml
+# will likely look very different (and much more reasonable)
+
+[package]
+edition = "2018"
+name = "build-parallel"
+version = "0.1.2"
+authors = ["Jeff Muizelaar <jrmuizel@gmail.com>"]
+description = "A helper library to let you parallelize work in build.rs\nusing the jobserver\n"
+documentation = "https://doc.rs/build-parallel"
+keywords = ["build-dependencies"]
+categories = ["development-tools::build-utils"]
+license = "MIT/Apache-2.0"
+repository = "https://github.com/jrmuizel/build-parallel"
+[dependencies.crossbeam-utils]
+version = "0.8"
+
+[dependencies.jobserver]
+version = "0.1.19"
+
+[dependencies.num_cpus]
+version = "1.0"
diff --git a/third_party/rust/build-parallel/src/lib.rs b/third_party/rust/build-parallel/src/lib.rs
new file mode 100644
index 0000000000..66a105e717
--- /dev/null
+++ b/third_party/rust/build-parallel/src/lib.rs
@@ -0,0 +1,223 @@
+use crossbeam_utils::thread;
+use std::any::Any;
+use std::env;
+use std::io;
+
+/// Represents the types of errors that may occur while using build-parallel.
+#[derive(Debug)]
+pub enum Error<E> {
+    /// Error occurred while internally performing I/O.
+    IOError(io::Error),
+    /// Error occurred during build callback.
+    BuildError(E),
+    /// Panic occurred during build callback.
+    BuildPanic(Box<dyn Any + Send + 'static>),
+}
+
+fn compile_object<T, R, E, F>(f: F, obj: &T) -> Result<R, Error<E>>
+where
+    T: 'static + Sync,
+    R: 'static + Sync + Send,
+    E: 'static + Sync + Send,
+    F: Fn(&T) -> Result<R, E> + Sync + Send,
+{
+    f(obj).map_err(Error::BuildError)
+}
+
+pub fn compile_objects<T, R, E, F>(f: &F, objs: &[T]) -> Result<Vec<R>, Error<E>>
+where
+    T: 'static + Sync,
+    R: 'static + Sync + Send,
+    E: 'static + Sync + Send,
+    F: Fn(&T) -> Result<R, E> + Sync + Send,
+{
+    use std::sync::atomic::{AtomicBool, Ordering::SeqCst};
+    use std::sync::Once;
+
+    // Limit our parallelism globally with a jobserver. Start off by
+    // releasing our own token for this process so we can have a bit of an
+    // easier to write loop below. If this fails, though, then we're likely
+    // on Windows with the main implicit token, so we just have a bit extra
+    // parallelism for a bit and don't reacquire later.
+    let server = jobserver();
+    let reacquire = server.release_raw().is_ok();
+
+    let res = thread::scope(|s| {
+        // When compiling objects in parallel we do a few dirty tricks to speed
+        // things up:
+        //
+        // * First is that we use the `jobserver` crate to limit the parallelism
+        //   of this build script. The `jobserver` crate will use a jobserver
+        //   configured by Cargo for build scripts to ensure that parallelism is
+        //   coordinated across C compilations and Rust compilations. Before we
+        //   compile anything we make sure to wait until we acquire a token.
+        //
+        //   Note that this jobserver is cached globally so we only used one per
+        //   process and only worry about creating it once.
+        //
+        // * Next we use a raw `thread::spawn` per thread to actually compile
+        //   objects in parallel. We only actually spawn a thread after we've
+        //   acquired a token to perform some work
+        //
+        // * Finally though we want to keep the dependencies of this crate
+        //   pretty light, so we avoid using a safe abstraction like `rayon` and
+        //   instead rely on some bits of `unsafe` code. We know that this stack
+        //   frame persists while everything is compiling so we use all the
+        //   stack-allocated objects without cloning/reallocating. We use a
+        //   transmute to `State` with a `'static` lifetime to persist
+        //   everything we need across the boundary, and the join-on-drop
+        //   semantics of `JoinOnDrop` should ensure that our stack frame is
+        //   alive while threads are alive.
+        //
+        // With all that in mind we compile all objects in a loop here, after we
+        // acquire the appropriate tokens, Once all objects have been compiled
+        // we join on all the threads and propagate the results of compilation.
+        //
+        // Note that as a slight optimization we try to break out as soon as
+        // possible as soon as any compilation fails to ensure that errors get
+        // out to the user as fast as possible.
+        let error = AtomicBool::new(false);
+        let mut handles = Vec::new();
+        for obj in objs {
+            if error.load(SeqCst) {
+                break;
+            }
+            let token = server.acquire().map_err(Error::IOError)?;
+            let state = State { obj, error: &error };
+            let state = unsafe { std::mem::transmute::<State<T>, State<'static, T>>(state) };
+            handles.push(s.spawn(|_| {
+                let state: State<T> = state; // erase the `'static` lifetime
+                let result = compile_object(f, state.obj);
+                if result.is_err() {
+                    state.error.store(true, SeqCst);
+                }
+                drop(token); // make sure our jobserver token is released after the compile
+                result
+            }));
+        }
+
+        let mut output = Vec::new();
+        for handle in handles {
+            match handle.join().map_err(Error::BuildPanic)? {
+                Ok(r) => output.push(r),
+                Err(err) => return Err(err),
+            }
+        }
+
+        Ok(output)
+    })
+    .map_err(Error::BuildPanic)?;
+
+    // Reacquire our process's token before we proceed, which we released
+    // before entering the loop above.
+    if reacquire {
+        server.acquire_raw().map_err(Error::IOError)?;
+    }
+
+    return res;
+
+    /// Shared state from the parent thread to the child thread. This
+    /// package of pointers is temporarily transmuted to a `'static`
+    /// lifetime to cross the thread boundary and then once the thread is
+    /// running we erase the `'static` to go back to an anonymous lifetime.
+    struct State<'a, O> {
+        obj: &'a O,
+        error: &'a AtomicBool,
+    }
+
+    /// Returns a suitable `jobserver::Client` used to coordinate
+    /// parallelism between build scripts.
+    fn jobserver() -> &'static jobserver::Client {
+        static INIT: Once = Once::new();
+        static mut JOBSERVER: Option<jobserver::Client> = None;
+
+        fn _assert_sync<T: Sync>() {}
+        _assert_sync::<jobserver::Client>();
+
+        unsafe {
+            INIT.call_once(|| {
+                let server = default_jobserver();
+                JOBSERVER = Some(server);
+            });
+            JOBSERVER.as_ref().unwrap()
+        }
+    }
+
+    unsafe fn default_jobserver() -> jobserver::Client {
+        // Try to use the environmental jobserver which Cargo typically
+        // initializes for us...
+        if let Some(client) = jobserver::Client::from_env() {
+            return client;
+        }
+
+        // ... but if that fails for whatever reason fall back to the number
+        // of cpus on the system or the `NUM_JOBS` env var.
+        let mut parallelism = num_cpus::get();
+        if let Ok(amt) = env::var("NUM_JOBS") {
+            if let Ok(amt) = amt.parse() {
+                parallelism = amt;
+            }
+        }
+
+        // If we create our own jobserver then be sure to reserve one token
+        // for ourselves.
+        let client = jobserver::Client::new(parallelism).expect("failed to create jobserver");
+        client.acquire_raw().expect("failed to acquire initial");
+        client
+    }
+}
+
+#[test]
+fn it_works() {
+    struct Object;
+    let mut v = Vec::new();
+    for _ in 0..4000 {
+        v.push(Object);
+    }
+    compile_objects::<Object, (), (), _>(
+        &|_| {
+            println!("compile {:?}", std::thread::current().id());
+            Ok(())
+        },
+        &v,
+    )
+    .unwrap();
+}
+
+#[test]
+fn test_build_error() {
+    struct Object;
+    let mut v = Vec::new();
+    v.push(Object);
+    let err = compile_objects::<Object, (), (), _>(
+        &|_| {
+            return Err(());
+        },
+        &v,
+    )
+    .unwrap_err();
+
+    match err {
+        Error::BuildError(_) => {},
+        _ => panic!("Unexpected error."),
+    }
+}
+
+#[test]
+fn test_build_panic() {
+    struct Object;
+    let mut v = Vec::new();
+    v.push(Object);
+    let err = compile_objects::<Object, (), (), _>(
+        &|_| {
+            panic!("Panic.");
+        },
+        &v,
+    )
+    .unwrap_err();
+
+    match err {
+        Error::BuildPanic(_) => {},
+        _ => panic!("Unexpected error."),
+    }
+}