1 files changed, 118 insertions, 0 deletions
diff --git a/vendor/portable-atomic/version.rs b/vendor/portable-atomic/version.rs
new file mode 100644
index 0000000..92f6ae1
--- /dev/null
+++ b/vendor/portable-atomic/version.rs
@@ -0,0 +1,118 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
+use std::{env, process::Command, str};
+
+pub(crate) fn rustc_version() -> Option<Version> {
+    let rustc = env::var_os("RUSTC")?;
+    // Use verbose version output because the packagers add extra strings to the normal version output.
+    let output = Command::new(rustc).args(&["--version", "--verbose"]).output().ok()?;
+    let verbose_version = str::from_utf8(&output.stdout).ok()?;
+    Version::parse(verbose_version)
+}
+
+#[cfg_attr(test, derive(Debug, PartialEq))]
+pub(crate) struct Version {
+    pub(crate) minor: u32,
+    pub(crate) nightly: bool,
+    commit_date: Date,
+    pub(crate) llvm: u32,
+}
+
+impl Version {
+    // The known latest stable version. If we unable to determine
+    // the rustc version, we assume this is the current version.
+    // It is no problem if this is older than the actual latest stable.
+    // LLVM version is assumed to be the minimum external LLVM version:
+    // https://github.com/rust-lang/rust/blob/1.74.0/src/bootstrap/llvm.rs#L558
+    pub(crate) const LATEST: Self = Self::stable(74, 15);
+
+    pub(crate) const fn stable(rustc_minor: u32, llvm_major: u32) -> Self {
+        Self { minor: rustc_minor, nightly: false, commit_date: Date::UNKNOWN, llvm: llvm_major }
+    }
+
+    pub(crate) fn probe(&self, minor: u32, year: u16, month: u8, day: u8) -> bool {
+        if self.nightly {
+            self.minor > minor || self.commit_date >= Date::new(year, month, day)
+        } else {
+            self.minor >= minor
+        }
+    }
+
+    #[cfg(test)]
+    pub(crate) fn commit_date(&self) -> &Date {
+        &self.commit_date
+    }
+
+    pub(crate) fn parse(verbose_version: &str) -> Option<Self> {
+        let mut release = verbose_version
+            .lines()
+            .find(|line| line.starts_with("release: "))
+            .map(|line| &line["release: ".len()..])?
+            .splitn(2, '-');
+        let version = release.next().unwrap();
+        let channel = release.next().unwrap_or_default();
+        let mut digits = version.splitn(3, '.');
+        let major = digits.next()?.parse::<u32>().ok()?;
+        if major != 1 {
+            return None;
+        }
+        let minor = digits.next()?.parse::<u32>().ok()?;
+        let _patch = digits.next().unwrap_or("0").parse::<u32>().ok()?;
+        let nightly = channel == "nightly" || channel == "dev";
+
+        let llvm_major = (|| {
+            let version = verbose_version
+                .lines()
+                .find(|line| line.starts_with("LLVM version: "))
+                .map(|line| &line["LLVM version: ".len()..])?;
+            let mut digits = version.splitn(3, '.');
+            let major = digits.next()?.parse::<u32>().ok()?;
+            let _minor = digits.next()?.parse::<u32>().ok()?;
+            let _patch = digits.next().unwrap_or("0").parse::<u32>().ok()?;
+            Some(major)
+        })()
+        .unwrap_or(0);
+
+        // we don't refer commit date on stable/beta.
+        if nightly {
+            let commit_date = (|| {
+                let mut commit_date = verbose_version
+                    .lines()
+                    .find(|line| line.starts_with("commit-date: "))
+                    .map(|line| &line["commit-date: ".len()..])?
+                    .splitn(3, '-');
+                let year = commit_date.next()?.parse::<u16>().ok()?;
+                let month = commit_date.next()?.parse::<u8>().ok()?;
+                let day = commit_date.next()?.parse::<u8>().ok()?;
+                if month > 12 || day > 31 {
+                    return None;
+                }
+                Some(Date::new(year, month, day))
+            })();
+            Some(Self {
+                minor,
+                nightly,
+                commit_date: commit_date.unwrap_or(Date::UNKNOWN),
+                llvm: llvm_major,
+            })
+        } else {
+            Some(Self::stable(minor, llvm_major))
+        }
+    }
+}
+
+#[derive(PartialEq, PartialOrd)]
+#[cfg_attr(test, derive(Debug))]
+pub(crate) struct Date {
+    pub(crate) year: u16,
+    pub(crate) month: u8,
+    pub(crate) day: u8,
+}
+
+impl Date {
+    const UNKNOWN: Self = Self::new(0, 0, 0);
+
+    const fn new(year: u16, month: u8, day: u8) -> Self {
+        Self { year, month, day }
+    }
+}