Sha256: c75ca9431787b918b9dbe19761182bb6f4e905451312a8135263fca51b7d25df
Contents?: true
Size: 1.67 KB
Versions: 9
Compression:
Stored size: 1.67 KB
Contents
use crate::prelude::*;
use crate::profiling_agent::ProfilingAgent;
use std::io::{self, BufWriter, Write};
use std::process;
use std::{fs::File, sync::Mutex};
/// Process-wide perf map file. Perf only reads a unique file per process.
static PERFMAP_FILE: Mutex<Option<BufWriter<File>>> = Mutex::new(None);
/// Interface for driving the creation of jitdump files
struct PerfMapAgent;
/// Initialize a JitDumpAgent and write out the header.
pub fn new() -> Result<Box<dyn ProfilingAgent>> {
let mut file = PERFMAP_FILE.lock().unwrap();
if file.is_none() {
let filename = format!("/tmp/perf-{}.map", process::id());
*file = Some(BufWriter::new(File::create(filename)?));
}
Ok(Box::new(PerfMapAgent))
}
impl PerfMapAgent {
fn make_line(writer: &mut dyn Write, name: &str, code: &[u8]) -> io::Result<()> {
// Format is documented here: https://github.com/torvalds/linux/blob/master/tools/perf/Documentation/jit-interface.txt
// Try our best to sanitize the name, since wasm allows for any utf8 string in there.
let sanitized_name = name.replace('\n', "_").replace('\r', "_");
write!(
writer,
"{:p} {:x} {}\n",
code.as_ptr(),
code.len(),
sanitized_name
)?;
writer.flush()?;
Ok(())
}
}
impl ProfilingAgent for PerfMapAgent {
fn register_function(&self, name: &str, code: &[u8]) {
let mut file = PERFMAP_FILE.lock().unwrap();
let file = file.as_mut().unwrap();
if let Err(err) = Self::make_line(file, name, code) {
eprintln!("Error when writing import trampoline info to the perf map file: {err}");
}
}
}
Version data entries
9 entries across 9 versions & 1 rubygems