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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 09:22:09 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 09:22:09 +0000
commit43a97878ce14b72f0981164f87f2e35e14151312 (patch)
tree620249daf56c0258faa40cbdcf9cfba06de2a846 /third_party/rust/bindgen/time.rs
parentInitial commit. (diff)
downloadfirefox-upstream.tar.xz
firefox-upstream.zip
Adding upstream version 110.0.1.upstream/110.0.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/rust/bindgen/time.rs')
-rw-r--r--third_party/rust/bindgen/time.rs52
1 files changed, 52 insertions, 0 deletions
diff --git a/third_party/rust/bindgen/time.rs b/third_party/rust/bindgen/time.rs
new file mode 100644
index 0000000000..c13a640c46
--- /dev/null
+++ b/third_party/rust/bindgen/time.rs
@@ -0,0 +1,52 @@
+use std::io::{self, Write};
+use std::time::{Duration, Instant};
+
+/// RAII timer to measure how long phases take.
+#[derive(Debug)]
+pub struct Timer<'a> {
+ output: bool,
+ name: &'a str,
+ start: Instant,
+}
+
+impl<'a> Timer<'a> {
+ /// Creates a Timer with the given name, and starts it. By default,
+ /// will print to stderr when it is `drop`'d
+ pub fn new(name: &'a str) -> Self {
+ Timer {
+ output: true,
+ name,
+ start: Instant::now(),
+ }
+ }
+
+ /// Sets whether or not the Timer will print a message
+ /// when it is dropped.
+ pub fn with_output(mut self, output: bool) -> Self {
+ self.output = output;
+ self
+ }
+
+ /// Returns the time elapsed since the timer's creation
+ pub fn elapsed(&self) -> Duration {
+ Instant::now() - self.start
+ }
+
+ fn print_elapsed(&mut self) {
+ if self.output {
+ let elapsed = self.elapsed();
+ let time = (elapsed.as_secs() as f64) * 1e3 +
+ (elapsed.subsec_nanos() as f64) / 1e6;
+ let stderr = io::stderr();
+ // Arbitrary output format, subject to change.
+ writeln!(stderr.lock(), " time: {:>9.3} ms.\t{}", time, self.name)
+ .expect("timer write should not fail");
+ }
+ }
+}
+
+impl<'a> Drop for Timer<'a> {
+ fn drop(&mut self) {
+ self.print_elapsed();
+ }
+}