Actually produce profiler files

Cargo.lock

@@ -1507,6 +1507,20 @@ dependencies = [
  "slab",
 ]
 
+[[package]]
+name = "fxprof-processed-profile"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "25234f20a3ec0a962a61770cfe39ecf03cb529a6e474ad8cff025ed497eda557"
+dependencies = [
+ "bitflags 2.9.1",
+ "debugid",
+ "rustc-hash 2.1.1",
+ "serde",
+ "serde_derive",
+ "serde_json",
+]
+
 [[package]]
 name = "gethostname"
 version = "0.4.3"
@@ -2140,10 +2154,12 @@ dependencies = [
  "egui_extras",
  "elf",
  "fixed",
+ "fxprof-processed-profile",
  "gilrs",
  "hex",
  "image",
  "itertools 0.14.0",
+ "normpath",
  "num-derive",
  "num-traits",
  "oneshot",
@@ -2569,6 +2585,15 @@ dependencies = [
  "minimal-lexical",
 ]
 
+[[package]]
+name = "normpath"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c8911957c4b1549ac0dc74e30db9c8b0e66ddcd6d7acc33098f4c63a64a6d7ed"
+dependencies = [
+ "windows-sys 0.59.0",
+]
+
 [[package]]
 name = "nu-ansi-term"
 version = "0.46.0"

Cargo.toml

@@ -22,11 +22,13 @@ egui-notify = "0.20"
 egui-winit = "0.32"
 egui-wgpu = { version = "0.32", features = ["winit"] }
 elf = "0.8"
+fxprof-processed-profile = "0.8"
 fixed = { version = "1.28", features = ["num-traits"] }
 gilrs = { version = "0.11", features = ["serde-serialize"] }
 hex = "0.4"
 image = { version = "0.25", default-features = false, features = ["png"] }
 itertools = "0.14"
+normpath = "1"
 num-derive = "0.4"
 num-traits = "0.2"
 oneshot = "0.1"

src/app.rs

@@ -116,11 +116,6 @@ impl ApplicationHandler<UserEvent> for Application {
             server.launch(port);
             self.open(event_loop, Box::new(server));
         }
-        if self.init_profiling {
-            let mut profiler = ProfileWindow::new(SimId::Player1, self.client.clone());
-            profiler.launch();
-            self.open(event_loop, Box::new(profiler));
-        }
         let app = GameWindow::new(
             self.client.clone(),
             self.proxy.clone(),
@@ -129,6 +124,11 @@ impl ApplicationHandler<UserEvent> for Application {
             SimId::Player1,
         );
         self.open(event_loop, Box::new(app));
+        if self.init_profiling {
+            let mut profiler = ProfileWindow::new(SimId::Player1, self.client.clone());
+            profiler.launch();
+            self.open(event_loop, Box::new(profiler));
+        }
     }
 
     fn window_event(

src/emulator/shrooms_vb_core.rs

@@ -210,7 +210,7 @@ extern "C" fn on_execute(sim: *mut VB, address: u32, code: *const u16, length: c
         }
     }
 
-    let mut stopped = data.stop_reason.is_some();
+    let mut stopped = data.stop_reason.is_some() || data.monitor.event.is_some();
     if data.step_from.is_some_and(|s| s != address) {
         data.step_from = None;
         data.stop_reason = Some(StopReason::Stepped);
@@ -247,7 +247,13 @@ extern "C" fn on_exception(sim: *mut VB, cause: *mut u16) -> c_int {
     // There is no way for the userdata to be null or otherwise invalid.
     let data: &mut VBState = unsafe { &mut *vb_get_user_data(sim).cast() };
     data.monitor.event = data.monitor.queued_event.take();
-    data.monitor.queued_event = Some(SimEvent::Interrupt(unsafe { *cause }));
+    let cause = unsafe { *cause };
+    let pc = if cause == 0xff70 {
+        0xffffff60
+    } else {
+        (cause & 0xfff0) as u32 | 0xffff0000
+    };
+    data.monitor.queued_event = Some(SimEvent::Interrupt(cause, pc));
     unsafe { vb_set_exception_callback(sim, None) };
     unsafe { vb_set_fetch_callback(sim, Some(on_fetch)) };
     if data.monitor.event.is_some() { 1 } else { 0 }
@@ -319,7 +325,8 @@ extern "C" fn on_write(
 pub enum SimEvent {
     Call(u32),
     Return,
-    Interrupt(u16),
+    Halt,
+    Interrupt(u16, u32),
     Reti,
 }
 
@@ -327,6 +334,7 @@ struct EventMonitor {
     enabled: bool,
     event: Option<SimEvent>,
     queued_event: Option<SimEvent>,
+    just_halted: bool,
 }
 
 impl EventMonitor {
@@ -335,6 +343,7 @@ impl EventMonitor {
             enabled: false,
             event: None,
             queued_event: None,
+            just_halted: false,
         }
     }
 
@@ -343,7 +352,8 @@ impl EventMonitor {
         self.queued_event.is_some()
     }
 
-    fn do_detect_event(&self, sim: *mut VB, address: u32, code: &[u16]) -> Option<SimEvent> {
+    fn do_detect_event(&mut self, sim: *mut VB, address: u32, code: &[u16]) -> Option<SimEvent> {
+        const HALT_OPCODE: u16 = 0b011010;
         const JAL_OPCODE: u16 = 0b101011;
         const JMP_OPCODE: u16 = 0b000110;
         const RETI_OPCODE: u16 = 0b011001;
@@ -359,6 +369,18 @@ impl EventMonitor {
 
         let opcode = code[0] >> 10;
 
+        if opcode == HALT_OPCODE {
+            if !self.just_halted {
+                self.just_halted = true;
+                self.event = Some(SimEvent::Halt);
+            } else {
+                self.just_halted = false;
+            }
+            // Don't _return_ an event, we want to emit this right away.
+            // If the CPU is halting, no other callbacks will run for a long time.
+            return None;
+        }
+
         if opcode == JAL_OPCODE {
             let disp = format_iv_disp(code);
             if disp != 4 {

src/profiler.rs

@@ -1,22 +1,25 @@
 use std::{
-    collections::HashMap,
     path::PathBuf,
-    sync::{
-        Arc,
-        atomic::{AtomicBool, Ordering},
-    },
+    sync::{Arc, Mutex},
     thread,
 };
 
+use anyhow::Result;
 use tokio::{select, sync::mpsc};
-use wholesym::{SymbolManager, SymbolMap};
 
 use crate::emulator::{EmulatorClient, EmulatorCommand, ProfileEvent, SimEvent, SimId};
+use recording::Recording;
+use state::ProgramState;
+
+mod recording;
+mod state;
+mod symbols;
 
 pub struct Profiler {
     sim_id: SimId,
     client: EmulatorClient,
-    running: Arc<AtomicBool>,
+    status: Arc<Mutex<ProfilerStatus>>,
+    action: Option<mpsc::UnboundedSender<RecordingAction>>,
     killer: Option<oneshot::Sender<()>>,
 }
 
@@ -25,21 +28,24 @@ impl Profiler {
         Self {
             sim_id,
             client,
-            running: Arc::new(AtomicBool::new(false)),
+            status: Arc::new(Mutex::new(ProfilerStatus::Disabled)),
+            action: None,
             killer: None,
         }
     }
 
-    pub fn started(&self) -> bool {
-        self.running.load(Ordering::Relaxed)
+    pub fn status(&self) -> ProfilerStatus {
+        self.status.lock().unwrap().clone()
     }
 
-    pub fn start(&mut self) {
+    pub fn enable(&mut self) {
         let sim_id = self.sim_id;
         let client = self.client.clone();
-        let running = self.running.clone();
-        let (tx, rx) = oneshot::channel();
-        self.killer = Some(tx);
+        let status = self.status.clone();
+        let (action_tx, action_rx) = mpsc::unbounded_channel();
+        self.action = Some(action_tx);
+        let (killer_tx, killer_rx) = oneshot::channel();
+        self.killer = Some(killer_tx);
         thread::spawn(move || {
             tokio::runtime::Builder::new_current_thread()
                 .enable_all()
@@ -47,130 +53,183 @@ impl Profiler {
                 .unwrap()
                 .block_on(async move {
                     select! {
-                        _ = run_profile(sim_id, client, running.clone()) => {}
-                        _ = rx => {
-                            running.store(false, Ordering::Relaxed);
+                        _ = run_profile(sim_id, client, status.clone(), action_rx) => {}
+                        _ = killer_rx => {
+                            *status.lock().unwrap() = ProfilerStatus::Disabled;
                         }
                     }
                 })
         });
     }
 
-    pub fn stop(&mut self) {
+    pub fn disable(&mut self) {
         if let Some(killer) = self.killer.take() {
             let _ = killer.send(());
         }
     }
+
+    pub fn start_recording(&mut self) {
+        if let Some(action) = &self.action {
+            let _ = action.send(RecordingAction::Start);
+        }
+    }
+
+    pub fn finish_recording(&mut self) -> oneshot::Receiver<Vec<u8>> {
+        let (tx, rx) = oneshot::channel();
+        if let Some(action) = &self.action {
+            let _ = action.send(RecordingAction::Finish(tx));
+        }
+        rx
+    }
+
+    pub fn cancel_recording(&mut self) {
+        if let Some(action) = &self.action {
+            let _ = action.send(RecordingAction::Cancel);
+        }
+    }
 }
 
-async fn run_profile(sim_id: SimId, client: EmulatorClient, running: Arc<AtomicBool>) {
+impl Drop for Profiler {
+    fn drop(&mut self) {
+        self.disable();
+    }
+}
+
+async fn run_profile(
+    sim_id: SimId,
+    client: EmulatorClient,
+    status: Arc<Mutex<ProfilerStatus>>,
+    mut action_source: mpsc::UnboundedReceiver<RecordingAction>,
+) {
     let (profile_sync, mut profile_source) = mpsc::unbounded_channel();
     client.send_command(EmulatorCommand::StartProfiling(sim_id, profile_sync));
 
-    running.store(true, Ordering::Relaxed);
+    *status.lock().unwrap() = ProfilerStatus::Enabled;
 
-    let mut session = None;
-    while let Some(event) = profile_source.recv().await {
-        match event {
-            ProfileEvent::Start { file_path } => {
-                session = Some(ProfileSession::new(file_path).await);
+    let mut session = ProfilerSession::new();
+    loop {
+        select! {
+            maybe_event = profile_source.recv() => {
+                let Some(event) = maybe_event else {
+                    break; // emulator thread disconnected
+                };
+                if let Err(error) = handle_event(event, &mut session).await {
+                    *status.lock().unwrap() = ProfilerStatus::Error(error.to_string());
+                    return;
                 }
+            }
+            maybe_action = action_source.recv() => {
+                let Some(action) = maybe_action else {
+                    break; // ui thread disconnected
+                };
+                handle_action(action, &mut session, &status);
+            }
+        }
+    }
+
+    *status.lock().unwrap() = ProfilerStatus::Disabled;
+}
+
+async fn handle_event(event: ProfileEvent, session: &mut ProfilerSession) -> Result<()> {
+    match event {
+        ProfileEvent::Start { file_path } => session.start_profiling(file_path).await,
         ProfileEvent::Update { cycles, event } => {
-                if let Some(session) = &mut session {
-                    session.track_elapsed_cycles(cycles);
+            session.track_elapsed_cycles(cycles)?;
             if let Some(event) = event {
-                        session.track_event(event);
+                session.track_event(event)?;
+            }
+            Ok(())
         }
     }
-            }
-        }
-    }
-    running.store(false, Ordering::Release);
 }
 
-struct ProfileSession {
-    symbol_map: SymbolMap,
-    call_stacks: HashMap<u16, Vec<StackFrame>>,
-    context_stack: Vec<u16>,
+fn handle_action(
+    action: RecordingAction,
+    session: &mut ProfilerSession,
+    status: &Mutex<ProfilerStatus>,
+) {
+    match action {
+        RecordingAction::Start => {
+            session.start_recording();
+            *status.lock().unwrap() = ProfilerStatus::Recording;
+        }
+        RecordingAction::Finish(rx) => {
+            if let Some(bytes) = session.finish_recording() {
+                let _ = rx.send(bytes);
+            }
+            *status.lock().unwrap() = ProfilerStatus::Enabled;
+        }
+        RecordingAction::Cancel => {
+            session.cancel_recording();
+            *status.lock().unwrap() = ProfilerStatus::Enabled;
+        }
+    }
 }
 
-struct StackFrame {
-    #[expect(dead_code)]
-    address: Option<u32>,
-    cycles: u64,
+#[derive(Clone)]
+pub enum ProfilerStatus {
+    Disabled,
+    Enabled,
+    Recording,
+    Error(String),
 }
 
-impl ProfileSession {
-    async fn new(file_path: PathBuf) -> Self {
-        let symbol_manager = SymbolManager::with_config(Default::default());
-        let symbol_map = symbol_manager
-            .load_symbol_map_for_binary_at_path(&file_path, None)
-            .await
-            .expect("cannae load symbols");
-        let mut call_stacks = HashMap::new();
-        call_stacks.insert(
-            0,
-            vec![StackFrame {
-                address: None,
-                cycles: 0,
-            }],
-        );
+impl ProfilerStatus {
+    pub fn enabled(&self) -> bool {
+        matches!(self, Self::Enabled | Self::Recording)
+    }
+}
+
+enum RecordingAction {
+    Start,
+    Finish(oneshot::Sender<Vec<u8>>),
+    Cancel,
+}
+
+struct ProfilerSession {
+    program: Option<ProgramState>,
+    recording: Option<Recording>,
+}
+
+impl ProfilerSession {
+    fn new() -> Self {
         Self {
-            symbol_map,
-            call_stacks,
-            context_stack: vec![],
+            program: None,
+            recording: None,
         }
     }
 
-    fn track_elapsed_cycles(&mut self, cycles: u32) {
-        let code = self.context_stack.last().copied().unwrap_or(0);
-        let Some(stack) = self.call_stacks.get_mut(&code) else {
-            panic!("missing stack {code:04x}");
-        };
-        for frame in stack {
-            frame.cycles += cycles as u64;
+    async fn start_profiling(&mut self, file_path: PathBuf) -> Result<()> {
+        self.program = Some(ProgramState::new(file_path).await?);
+        self.recording = None;
+        Ok(())
+    }
+
+    fn track_elapsed_cycles(&mut self, cycles: u32) -> Result<()> {
+        if let (Some(state), Some(recording)) = (&self.program, &mut self.recording) {
+            recording.track_elapsed_cycles(state, cycles);
+        }
+        Ok(())
+    }
+
+    fn track_event(&mut self, event: SimEvent) -> Result<()> {
+        if let Some(program) = &mut self.program {
+            program.track_event(event)?;
+        }
+        Ok(())
+    }
+
+    fn start_recording(&mut self) {
+        if let Some(program) = &self.program {
+            self.recording = Some(Recording::new(program));
         }
     }
 
-    fn track_event(&mut self, event: SimEvent) {
-        match event {
-            SimEvent::Interrupt(code) => {
-                self.context_stack.push(code);
-                if self.call_stacks.insert(code, vec![]).is_some() {
-                    panic!("{code:04x} fired twice");
-                }
-            }
-            SimEvent::Reti => {
-                let Some(code) = self.context_stack.pop() else {
-                    panic!("reti when not in interrupt");
-                };
-                if self.call_stacks.remove(&code).is_none() {
-                    panic!("{code:04x} popped but never called")
-                }
-            }
-            SimEvent::Call(addr) => {
-                let code = self.context_stack.last().copied().unwrap_or(0);
-                let Some(stack) = self.call_stacks.get_mut(&code) else {
-                    panic!("missing stack {code:04x}");
-                };
-                let name = self
-                    .symbol_map
-                    .lookup_sync(wholesym::LookupAddress::Svma(addr as u64));
-                println!("depth {}: {:?}", stack.len(), name);
-                stack.push(StackFrame {
-                    address: Some(addr),
-                    cycles: 0,
-                });
-            }
-            SimEvent::Return => {
-                let code = self.context_stack.last().copied().unwrap_or(0);
-                let Some(stack) = self.call_stacks.get_mut(&code) else {
-                    panic!("missing stack {code:04x}");
-                };
-                if stack.pop().is_none() {
-                    panic!("returned from {code:04x} but stack was empty");
-                }
-            }
+    fn finish_recording(&mut self) -> Option<Vec<u8>> {
+        self.recording.take().map(|r| r.finish())
     }
+
+    fn cancel_recording(&mut self) {
+        self.recording.take();
     }
 }

src/profiler/recording.rs

@@ -0,0 +1,114 @@
+use std::collections::HashMap;
+
+use fxprof_processed_profile::{
+    CategoryHandle, CpuDelta, Frame, FrameFlags, FrameInfo, ProcessHandle, Profile,
+    ReferenceTimestamp, SamplingInterval, StackHandle, ThreadHandle, Timestamp,
+};
+
+use crate::profiler::state::{ProgramState, RESET_CODE, StackFrame};
+
+pub struct Recording {
+    profile: Profile,
+    process: ProcessHandle,
+    threads: HashMap<u16, ThreadHandle>,
+    now: u64,
+}
+
+impl Recording {
+    pub fn new(state: &ProgramState) -> Self {
+        let symbol_file = state.symbol_file();
+
+        let name = &symbol_file.name();
+        let reference_timestamp = ReferenceTimestamp::from_millis_since_unix_epoch(0.0);
+        let interval = SamplingInterval::from_hz(20_000_000.0);
+        let mut profile = Profile::new(name, reference_timestamp, interval);
+
+        let process = profile.add_process(name, 1, Timestamp::from_nanos_since_reference(0));
+
+        let lib = profile.add_lib(symbol_file.library_info().clone());
+        profile.add_lib_mapping(process, lib, 0x00000000, 0xffffffff, 0);
+
+        let mut me = Self {
+            profile,
+            process,
+            threads: HashMap::new(),
+            now: 0,
+        };
+        me.track_elapsed_cycles(state, 0);
+        me
+    }
+
+    pub fn track_elapsed_cycles(&mut self, state: &ProgramState, cycles: u32) {
+        self.now += cycles as u64;
+        let timestamp = Timestamp::from_nanos_since_reference(self.now * 50);
+        let weight = 1;
+
+        let active_code = if let Some((code, frames)) = state.current_stack() {
+            let thread = *self.threads.entry(code).or_insert_with(|| {
+                let process = self.process;
+                let tid = code as u32;
+                let start_time = Timestamp::from_nanos_since_reference(self.now * 50);
+                let is_main = code == RESET_CODE;
+                let thread = self.profile.add_thread(process, tid, start_time, is_main);
+                self.profile
+                    .set_thread_name(thread, &thread_name_for_code(code));
+                thread
+            });
+
+            let stack = self.handle_for_stack(thread, frames);
+            let cpu_delta = CpuDelta::from_nanos((self.now - cycles as u64) * 50);
+            self.profile
+                .add_sample(thread, timestamp, stack, cpu_delta, weight);
+            Some(code)
+        } else {
+            None
+        };
+        for (code, thread) in &self.threads {
+            if active_code == Some(*code) {
+                continue;
+            }
+            self.profile
+                .add_sample_same_stack_zero_cpu(*thread, timestamp, weight);
+        }
+    }
+
+    pub fn finish(self) -> Vec<u8> {
+        serde_json::to_vec(&self.profile).expect("could not serialize profile")
+    }
+
+    fn handle_for_stack(
+        &mut self,
+        thread: ThreadHandle,
+        frames: &[StackFrame],
+    ) -> Option<StackHandle> {
+        self.profile.intern_stack_frames(
+            thread,
+            frames.iter().map(|f| FrameInfo {
+                frame: Frame::InstructionPointer(f.address as u64),
+                category_pair: CategoryHandle::OTHER.into(),
+                flags: FrameFlags::empty(),
+            }),
+        )
+    }
+}
+
+fn thread_name_for_code(code: u16) -> std::borrow::Cow<'static, str> {
+    match code {
+        RESET_CODE => "Main".into(),
+        0xffd0 => "Duplexed exception".into(),
+        0xfe40 => "VIP interrupt".into(),
+        0xfe30 => "Communication interrupt".into(),
+        0xfe20 => "Game pak interrupt".into(),
+        0xfe10 => "Timer interrupt".into(),
+        0xfe00 => "Game pad interrupt".into(),
+        0xffc0 => "Address trap".into(),
+        0xffa0..0xffc0 => format!("Trap (vector {})", code - 0xffa0).into(),
+        0xff90 => "Illegal opcode exception".into(),
+        0xff80 => "Zero division exception".into(),
+        0xff60 => "Floating-point reserved operand exception".into(),
+        0xff70 => "Floating-point invalid operation exception".into(),
+        0xff68 => "Floating-point zero division exception".into(),
+        0xff64 => "Floating-point overflow exception".into(),
+        other => format!("Unrecognized handler (0x{other:04x})").into(),
+    }
+}

src/profiler/state.rs

@@ -0,0 +1,104 @@
+use std::{collections::HashMap, path::PathBuf};
+
+use anyhow::{Result, bail};
+
+use crate::{emulator::SimEvent, profiler::symbols::SymbolFile};
+
+pub struct ProgramState {
+    symbol_file: SymbolFile,
+    call_stacks: HashMap<u16, Vec<StackFrame>>,
+    context_stack: Vec<u16>,
+}
+
+pub struct StackFrame {
+    pub address: u32,
+}
+
+pub const RESET_CODE: u16 = 0xfff0;
+impl ProgramState {
+    pub async fn new(file_path: PathBuf) -> Result<Self> {
+        let symbol_file = SymbolFile::load(&file_path).await?;
+        let mut call_stacks = HashMap::new();
+        call_stacks.insert(
+            RESET_CODE,
+            vec![StackFrame {
+                address: 0xfffffff0,
+            }],
+        );
+        Ok(Self {
+            symbol_file,
+            call_stacks,
+            context_stack: vec![RESET_CODE],
+        })
+    }
+
+    pub fn symbol_file(&self) -> &SymbolFile {
+        &self.symbol_file
+    }
+
+    pub fn current_stack(&self) -> Option<(u16, &[StackFrame])> {
+        let code = self.context_stack.last()?;
+        let call_stack = self.call_stacks.get(code)?;
+        Some((*code, call_stack))
+    }
+
+    pub fn track_event(&mut self, event: SimEvent) -> Result<()> {
+        match event {
+            SimEvent::Call(address) => {
+                let Some(code) = self.context_stack.last() else {
+                    bail!("How did we call anything when we're halted?");
+                };
+                let Some(stack) = self.call_stacks.get_mut(code) else {
+                    bail!("missing stack {code:04x}");
+                };
+                stack.push(StackFrame { address });
+            }
+            SimEvent::Return => {
+                let Some(code) = self.context_stack.last() else {
+                    bail!("how did we return when we're halted?");
+                };
+                let Some(stack) = self.call_stacks.get_mut(code) else {
+                    bail!("missing stack {code:04x}");
+                };
+                if stack.pop().is_none() {
+                    bail!("returned from {code:04x} but stack was empty");
+                }
+                if stack.is_empty() {
+                    bail!("returned to oblivion");
+                }
+            }
+            SimEvent::Halt => {
+                let Some(RESET_CODE) = self.context_stack.pop() else {
+                    bail!("halted when not in an interrupt");
+                };
+            }
+            SimEvent::Interrupt(code, address) => {
+                // if the CPU was halted before, wake it up now
+                if self.context_stack.is_empty() {
+                    self.context_stack.push(RESET_CODE);
+                }
+
+                self.context_stack.push(code);
+                if self
+                    .call_stacks
+                    .insert(code, vec![StackFrame { address }])
+                    .is_some()
+                {
+                    bail!("{code:04x} fired twice");
+                }
+            }
+            SimEvent::Reti => {
+                let Some(code) = self.context_stack.pop() else {
+                    bail!("RETI when halted");
+                };
+                if code == RESET_CODE {
+                    bail!("RETI when not in interrupt");
+                }
+                if self.call_stacks.remove(&code).is_none() {
+                    bail!("{code:04x} popped but never called");
+                }
+            }
+        }
+        Ok(())
+    }
+}

src/profiler/symbols.rs

@@ -0,0 +1,67 @@
+use std::{path::Path, sync::Arc};
+
+use anyhow::Result;
+use fxprof_processed_profile::{LibraryInfo, Symbol, SymbolTable};
+use wholesym::{SymbolManager, samply_symbols::demangle_any};
+
+pub struct SymbolFile {
+    library_info: LibraryInfo,
+}
+
+impl SymbolFile {
+    pub async fn load(file_path: &Path) -> Result<Self> {
+        let normalized = normpath::PathExt::normalize(file_path)?;
+        let library_info =
+            SymbolManager::library_info_for_binary_at_path(normalized.as_path(), None).await?;
+
+        let symbol_manager = SymbolManager::with_config(Default::default());
+        let symbol_map = symbol_manager
+            .load_symbol_map_for_binary_at_path(normalized.as_path(), None)
+            .await?;
+
+        let name = library_info
+            .name
+            .or_else(|| {
+                normalized
+                    .file_name()
+                    .map(|n| n.to_string_lossy().into_owned())
+            })
+            .unwrap_or("game".to_string());
+        let debug_name = library_info.debug_name.unwrap_or_else(|| name.clone());
+        let path = library_info
+            .path
+            .unwrap_or_else(|| normalized.into_os_string().to_string_lossy().into_owned());
+        let debug_path = library_info.debug_path.unwrap_or_else(|| path.clone());
+        let debug_id = library_info.debug_id.unwrap_or_default();
+        let code_id = library_info.code_id.map(|id| id.to_string());
+        let arch = library_info.arch;
+        let symbols = symbol_map
+            .iter_symbols()
+            .map(|(address, name)| Symbol {
+                address: address + 0x07000000,
+                size: None,
+                name: demangle_any(&name),
+            })
+            .collect();
+        Ok(Self {
+            library_info: LibraryInfo {
+                name,
+                debug_name,
+                path,
+                debug_path,
+                debug_id,
+                code_id,
+                arch,
+                symbol_table: Some(Arc::new(SymbolTable::new(symbols))),
+            },
+        })
+    }
+
+    pub fn name(&self) -> &str {
+        &self.library_info.name
+    }
+
+    pub fn library_info(&self) -> &LibraryInfo {
+        &self.library_info
+    }
+}

src/window/profile.rs

@@ -1,14 +1,19 @@
-use egui::{CentralPanel, ViewportBuilder, ViewportId};
+use std::{fs, time::Duration};
+
+use anyhow::Result;
+use egui::{Button, CentralPanel, Checkbox, ViewportBuilder, ViewportId};
+use egui_notify::{Anchor, Toast, Toasts};
 
 use crate::{
     emulator::{EmulatorClient, SimId},
-    profiler::Profiler,
+    profiler::{Profiler, ProfilerStatus},
     window::AppWindow,
 };
 
 pub struct ProfileWindow {
     sim_id: SimId,
     profiler: Profiler,
+    toasts: Toasts,
 }
 
 impl ProfileWindow {
@@ -16,11 +21,47 @@ impl ProfileWindow {
         Self {
             sim_id,
             profiler: Profiler::new(sim_id, client),
+            toasts: Toasts::new()
+                .with_anchor(Anchor::BottomLeft)
+                .with_margin((10.0, 10.0).into())
+                .reverse(true),
         }
     }
 
     pub fn launch(&mut self) {
-        self.profiler.start();
+        self.profiler.enable();
+    }
+
+    fn finish_recording(&mut self) {
+        match self.try_finish_recording() {
+            Ok(Some(path)) => {
+                let mut toast = Toast::info(format!("Saved to {path}"));
+                toast.duration(Some(Duration::from_secs(5)));
+                self.toasts.add(toast);
+            }
+            Ok(None) => {}
+            Err(error) => {
+                let mut toast = Toast::error(format!("{error:#}"));
+                toast.duration(Some(Duration::from_secs(5)));
+                self.toasts.add(toast);
+            }
+        }
+    }
+
+    fn try_finish_recording(&mut self) -> Result<Option<String>> {
+        let bytes_receiver = self.profiler.finish_recording();
+        let file = rfd::FileDialog::new()
+            .add_filter("Profiler files", &["json"])
+            .set_file_name("profile.json")
+            .save_file();
+        if let Some(path) = file {
+            let bytes = pollster::block_on(bytes_receiver)?;
+            fs::write(&path, bytes)?;
+            Ok(Some(path.display().to_string()))
+        } else {
+            self.profiler.cancel_recording();
+            Ok(None)
+        }
     }
 }
 
@@ -40,15 +81,46 @@ impl AppWindow for ProfileWindow {
     }
 
     fn show(&mut self, ctx: &egui::Context) {
+        let status = self.profiler.status();
+        let recording = matches!(status, ProfilerStatus::Recording);
         CentralPanel::default().show(ctx, |ui| {
-            let mut started = self.profiler.started();
-            if ui.checkbox(&mut started, "Profiling enabled?").changed() {
-                if started {
-                    self.profiler.start();
+            let mut enabled = status.enabled();
+            let enabled_checkbox = Checkbox::new(&mut enabled, "Profiling enabled?");
+            if ui.add_enabled(!recording, enabled_checkbox).changed() {
+                if enabled {
+                    self.profiler.enable();
                 } else {
-                    self.profiler.stop();
+                    self.profiler.disable();
+                }
+            }
+
+            ui.horizontal(|ui| {
+                if !recording {
+                    let record_button = Button::new("Record");
+                    let can_record = matches!(status, ProfilerStatus::Enabled);
+                    if ui.add_enabled(can_record, record_button).clicked() {
+                        self.profiler.start_recording();
+                    }
+                } else {
+                    if ui.button("Finish recording").clicked() {
+                        self.finish_recording();
+                    }
+                    if ui.button("Cancel recording").clicked() {
+                        self.profiler.cancel_recording();
                     }
                 }
             });
+
+            match &status {
+                ProfilerStatus::Recording => {
+                    ui.label("Recording...");
+                }
+                ProfilerStatus::Error(message) => {
+                    ui.label(message);
+                }
+                _ => {}
+            }
+        });
+        self.toasts.show(ctx);
     }
 }