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