1 files changed, 67 insertions, 0 deletions
diff --git a/compiler/rustc_middle/src/util/common.rs b/compiler/rustc_middle/src/util/common.rs
new file mode 100644
index 000000000..08977049d
--- /dev/null
+++ b/compiler/rustc_middle/src/util/common.rs
@@ -0,0 +1,67 @@
+use rustc_data_structures::sync::Lock;
+
+use std::fmt::Debug;
+use std::time::{Duration, Instant};
+
+#[cfg(test)]
+mod tests;
+
+pub fn to_readable_str(mut val: usize) -> String {
+    let mut groups = vec![];
+    loop {
+        let group = val % 1000;
+
+        val /= 1000;
+
+        if val == 0 {
+            groups.push(group.to_string());
+            break;
+        } else {
+            groups.push(format!("{:03}", group));
+        }
+    }
+
+    groups.reverse();
+
+    groups.join("_")
+}
+
+pub fn record_time<T, F>(accu: &Lock<Duration>, f: F) -> T
+where
+    F: FnOnce() -> T,
+{
+    let start = Instant::now();
+    let rv = f();
+    let duration = start.elapsed();
+    let mut accu = accu.lock();
+    *accu += duration;
+    rv
+}
+
+pub fn indent<R, F>(op: F) -> R
+where
+    R: Debug,
+    F: FnOnce() -> R,
+{
+    // Use in conjunction with the log post-processor like `src/etc/indenter`
+    // to make debug output more readable.
+    debug!(">>");
+    let r = op();
+    debug!("<< (Result = {:?})", r);
+    r
+}
+
+pub struct Indenter {
+    _cannot_construct_outside_of_this_module: (),
+}
+
+impl Drop for Indenter {
+    fn drop(&mut self) {
+        debug!("<<");
+    }
+}
+
+pub fn indenter() -> Indenter {
+    debug!(">>");
+    Indenter { _cannot_construct_outside_of_this_module: () }
+}