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use std::time::Instant;
use crate::DiagCtxtHandle;
/// A high-level section of the compilation process.
#[derive(Copy, Clone, Debug)]
pub enum TimingSection {
/// Time spent linking.
Linking,
}
/// Section with attached timestamp
#[derive(Copy, Clone, Debug)]
pub struct TimingRecord {
pub section: TimingSection,
/// Microseconds elapsed since some predetermined point in time (~start of the rustc process).
pub timestamp: u128,
}
impl TimingRecord {
fn from_origin(origin: Instant, section: TimingSection) -> Self {
Self { section, timestamp: Instant::now().duration_since(origin).as_micros() }
}
pub fn section(&self) -> TimingSection {
self.section
}
pub fn timestamp(&self) -> u128 {
self.timestamp
}
}
/// Manages emission of start/end section timings, enabled through `--json=timings`.
pub struct TimingSectionHandler {
/// Time when the compilation session started.
/// If `None`, timing is disabled.
origin: Option<Instant>,
}
impl TimingSectionHandler {
pub fn new(enabled: bool) -> Self {
let origin = if enabled { Some(Instant::now()) } else { None };
Self { origin }
}
/// Returns a RAII guard that will immediately emit a start the provided section, and then emit
/// its end when it is dropped.
pub fn start_section<'a>(
&self,
diag_ctxt: DiagCtxtHandle<'a>,
section: TimingSection,
) -> TimingSectionGuard<'a> {
TimingSectionGuard::create(diag_ctxt, section, self.origin)
}
}
/// RAII wrapper for starting and ending section timings.
pub struct TimingSectionGuard<'a> {
dcx: DiagCtxtHandle<'a>,
section: TimingSection,
origin: Option<Instant>,
}
impl<'a> TimingSectionGuard<'a> {
fn create(dcx: DiagCtxtHandle<'a>, section: TimingSection, origin: Option<Instant>) -> Self {
if let Some(origin) = origin {
dcx.emit_timing_section_start(TimingRecord::from_origin(origin, section));
}
Self { dcx, section, origin }
}
}
impl<'a> Drop for TimingSectionGuard<'a> {
fn drop(&mut self) {
if let Some(origin) = self.origin {
self.dcx.emit_timing_section_end(TimingRecord::from_origin(origin, self.section));
}
}
}
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