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//! A collection of tools for profiling rust-analyzer.
mod stop_watch;
mod memory_usage;
#[cfg(feature = "cpu_profiler")]
mod google_cpu_profiler;
mod hprof;
mod tree;
use std::cell::RefCell;
pub use crate::{
hprof::{init, init_from, span},
memory_usage::{Bytes, MemoryUsage},
stop_watch::{StopWatch, StopWatchSpan},
};
/// Prints backtrace to stderr, useful for debugging.
#[cfg(feature = "backtrace")]
pub fn print_backtrace() {
let bt = backtrace::Backtrace::new();
eprintln!("{:?}", bt);
}
#[cfg(not(feature = "backtrace"))]
pub fn print_backtrace() {
eprintln!(
r#"enable the backtrace feature:
profile = {{ path = "../profile", features = [ "backtrace"] }}
"#
);
}
thread_local!(static IN_SCOPE: RefCell<bool> = RefCell::new(false));
/// Allows to check if the current code is withing some dynamic scope, can be
/// useful during debugging to figure out why a function is called.
pub struct Scope {
prev: bool,
}
impl Scope {
#[must_use]
pub fn enter() -> Scope {
let prev = IN_SCOPE.with(|slot| std::mem::replace(&mut *slot.borrow_mut(), true));
Scope { prev }
}
pub fn is_active() -> bool {
IN_SCOPE.with(|slot| *slot.borrow())
}
}
impl Drop for Scope {
fn drop(&mut self) {
IN_SCOPE.with(|slot| *slot.borrow_mut() = self.prev);
}
}
/// A wrapper around google_cpu_profiler.
///
/// Usage:
/// 1. Install gpref_tools (https://github.com/gperftools/gperftools), probably packaged with your Linux distro.
/// 2. Build with `cpu_profiler` feature.
/// 3. Tun the code, the *raw* output would be in the `./out.profile` file.
/// 4. Install pprof for visualization (https://github.com/google/pprof).
/// 5. Bump sampling frequency to once per ms: `export CPUPROFILE_FREQUENCY=1000`
/// 6. Use something like `pprof -svg target/release/rust-analyzer ./out.profile` to see the results.
///
/// For example, here's how I run profiling on NixOS:
///
/// ```bash
/// $ nix-shell -p gperftools --run \
/// 'cargo run --release -p rust-analyzer -- parse < ~/projects/rustbench/parser.rs > /dev/null'
/// ```
///
/// See this diff for how to profile completions:
///
/// https://github.com/rust-analyzer/rust-analyzer/pull/5306
#[derive(Debug)]
pub struct CpuSpan {
_private: (),
}
#[must_use]
pub fn cpu_span() -> CpuSpan {
#[cfg(feature = "cpu_profiler")]
{
google_cpu_profiler::start("./out.profile".as_ref())
}
#[cfg(not(feature = "cpu_profiler"))]
{
eprintln!("cpu_profiler feature is disabled")
}
CpuSpan { _private: () }
}
impl Drop for CpuSpan {
fn drop(&mut self) {
#[cfg(feature = "cpu_profiler")]
{
google_cpu_profiler::stop()
}
}
}
pub fn memory_usage() -> MemoryUsage {
MemoryUsage::current()
}
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