Function dump_frame_from_raw

crates/stdlib/src/faulthandler.rs:253–275

(fd: i32, frame: &Frame)

    /// Dump a single frame's info to fd (signal-safe), reading live data.
    #[cfg(any(unix, windows))]
    fn dump_frame_from_raw(fd: i32, frame: &Frame) {
        let filename = frame.code.source_path().as_str();
        let funcname = frame.code.obj_name.as_str();
        let lasti = frame.lasti();
        let lineno = if lasti == 0 {
            frame.code.first_line_number.map(|n| n.get()).unwrap_or(1) as u32
        } else {
            let idx = (lasti as usize).saturating_sub(1);
            if idx < frame.code.locations.len() {
                frame.code.locations[idx].0.line.get() as u32
            } else {
                frame.code.first_line_number.map(|n| n.get()).unwrap_or(0) as u32
            }
        };

        puts(fd, "  File \"");
        dump_ascii(fd, filename);
        puts(fd, "\", line ");
        dump_decimal(fd, lineno as usize);
        puts(fd, " in ");
        dump_ascii(fd, funcname);
        puts(fd, "\n");
    }

    // faulthandler_dump_traceback (signal-safe, for fatal errors)
    #[cfg(any(unix, windows))]