Move rayon-core to rustc_thread_pool files as is

This commit literally copied the directory rayon-core from
revision `5fadf44`. Link:
https://github.com/rust-lang/rustc-rayon/tree/5fadf44/rayon-core

1 files changed, 98 insertions, 0 deletions

diff --git a/compiler/rustc_thread_pool/tests/stack_overflow_crash.rs b/compiler/rustc_thread_pool/tests/stack_overflow_crash.rs
new file mode 100644
index 00000000000..a6494069212
--- /dev/null
+++ b/compiler/rustc_thread_pool/tests/stack_overflow_crash.rs
@@ -0,0 +1,98 @@
+use rayon_core::ThreadPoolBuilder;
+
+use std::env;
+use std::process::{Command, ExitStatus, Stdio};
+
+#[cfg(target_os = "linux")]
+use std::os::unix::process::ExitStatusExt;
+
+fn force_stack_overflow(depth: u32) {
+    let mut buffer = [0u8; 1024 * 1024];
+    #[allow(clippy::incompatible_msrv)]
+    std::hint::black_box(&mut buffer);
+    if depth > 0 {
+        force_stack_overflow(depth - 1);
+    }
+}
+
+#[cfg(unix)]
+fn disable_core() {
+    unsafe {
+        libc::setrlimit(
+            libc::RLIMIT_CORE,
+            &libc::rlimit {
+                rlim_cur: 0,
+                rlim_max: 0,
+            },
+        );
+    }
+}
+
+#[cfg(unix)]
+fn overflow_code() -> Option<i32> {
+    None
+}
+
+#[cfg(windows)]
+fn overflow_code() -> Option<i32> {
+    use std::os::windows::process::ExitStatusExt;
+
+    ExitStatus::from_raw(0xc00000fd /*STATUS_STACK_OVERFLOW*/).code()
+}
+
+#[test]
+#[cfg_attr(not(any(unix, windows)), ignore)]
+fn stack_overflow_crash() {
+    // First check that the recursive call actually causes a stack overflow,
+    // and does not get optimized away.
+    let status = run_ignored("run_with_small_stack");
+    assert!(!status.success());
+    #[cfg(any(unix, windows))]
+    assert_eq!(status.code(), overflow_code());
+    #[cfg(target_os = "linux")]
+    assert!(matches!(
+        status.signal(),
+        Some(libc::SIGABRT | libc::SIGSEGV)
+    ));
+
+    // Now run with a larger stack and verify correct operation.
+    let status = run_ignored("run_with_large_stack");
+    assert_eq!(status.code(), Some(0));
+    #[cfg(target_os = "linux")]
+    assert_eq!(status.signal(), None);
+}
+
+fn run_ignored(test: &str) -> ExitStatus {
+    Command::new(env::current_exe().unwrap())
+        .arg("--ignored")
+        .arg("--exact")
+        .arg(test)
+        .stdout(Stdio::null())
+        .stderr(Stdio::null())
+        .status()
+        .unwrap()
+}
+
+#[test]
+#[ignore]
+fn run_with_small_stack() {
+    run_with_stack(8);
+}
+
+#[test]
+#[ignore]
+fn run_with_large_stack() {
+    run_with_stack(48);
+}
+
+fn run_with_stack(stack_size_in_mb: usize) {
+    let pool = ThreadPoolBuilder::new()
+        .stack_size(stack_size_in_mb * 1024 * 1024)
+        .build()
+        .unwrap();
+    pool.install(|| {
+        #[cfg(unix)]
+        disable_core();
+        force_stack_overflow(32);
+    });
+}