Version 0.5.1

Uses file modification timestamp polling for project config and objects to avoid unneeded complexity from the filesystem notification watcher.

Allows disabling `build_base` as well for projects using an external build system.

Cargo.toml

@@ -1,8 +1,8 @@
 [package]
 name = "objdiff"
-version = "0.3.4"
+version = "0.5.1"
 edition = "2021"
-rust-version = "1.65"
+rust-version = "1.70"
 authors = ["Luke Street <luke@street.dev>"]
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/encounter/objdiff"
@@ -22,44 +22,47 @@ default = []
 wgpu = ["eframe/wgpu"]
 
 [dependencies]
-anyhow = "1.0.71"
-byteorder = "1.4.3"
-bytes = "1.4.0"
+anyhow = "1.0.75"
+byteorder = "1.5.0"
+bytes = "1.5.0"
 cfg-if = "1.0.0"
 const_format = "0.2.31"
-cwdemangle = "0.1.5"
+cwdemangle = "0.1.6"
 dirs = "5.0.1"
-eframe = { version = "0.22.0", features = ["persistence"] }
-egui = "0.22.0"
-egui_extras = "0.22.0"
-flagset = "0.4.3"
+eframe = { version = "0.23.0", features = ["persistence"] }
+egui = "0.23.0"
+egui_extras = "0.23.0"
+filetime = "0.2.22"
+flagset = "0.4.4"
 globset = { version = "0.4.13", features = ["serde1"] }
-log = "0.4.19"
-memmap2 = "0.7.1"
-notify = "6.0.1"
-object = { version = "0.31.1", features = ["read_core", "std", "elf"], default-features = false }
-png = "0.17.9"
-ppc750cl = { git = "https://github.com/terorie/ppc750cl", rev = "9ae36eef34aa6d74e00972c7671f547a2acfd0aa" }
-rabbitizer = "1.7.4"
-rfd = { version = "0.11.4" } #, default-features = false, features = ['xdg-portal']
+log = "0.4.20"
+memmap2 = "0.9.0"
+notify = "6.1.1"
+object = { version = "0.32.1", features = ["read_core", "std", "elf"], default-features = false }
+png = "0.17.10"
+ppc750cl = { git = "https://github.com/encounter/ppc750cl", rev = "4a2bbbc6f84dcb76255ab6f3595a8d4a0ce96618" }
+rabbitizer = "1.7.10"
+rfd = { version = "0.12.0" } #, default-features = false, features = ['xdg-portal']
+ron = "0.8.1"
+semver = "1.0.19"
 serde = { version = "1", features = ["derive"] }
-serde_json = "1.0.104"
+serde_json = "1.0.107"
 serde_yaml = "0.9.25"
-tempfile = "3.6.0"
-thiserror = "1.0.41"
-time = { version = "0.3.22", features = ["formatting", "local-offset"] }
-toml = "0.7.6"
+tempfile = "3.8.0"
+thiserror = "1.0.49"
+time = { version = "0.3.29", features = ["formatting", "local-offset"] }
+toml = "0.8.2"
 twox-hash = "1.6.3"
 
 # For Linux static binaries, use rustls
 [target.'cfg(target_os = "linux")'.dependencies]
-reqwest = { version = "0.11.18", default-features = false, features = ["blocking", "json", "rustls"] }
-self_update = { version = "0.37.0", default-features = false, features = ["rustls"] }
+reqwest = { version = "0.11.22", default-features = false, features = ["blocking", "json", "rustls"] }
+self_update = { version = "0.38.0", default-features = false, features = ["rustls"] }
 
 # For all other platforms, use native TLS
 [target.'cfg(not(target_os = "linux"))'.dependencies]
-reqwest = "0.11.18"
-self_update = "0.37.0"
+reqwest = "0.11.22"
+self_update = "0.38.0"
 
 [target.'cfg(windows)'.dependencies]
 path-slash = "0.2.1"
@@ -81,5 +84,5 @@ console_error_panic_hook = "0.1.7"
 tracing-wasm = "0.2"
 
 [build-dependencies]
-anyhow = "1.0.71"
-vergen = { version = "8.2.4", features = ["build", "cargo", "git", "gitcl"] }
+anyhow = "1.0.75"
+vergen = { version = "8.2.5", features = ["build", "cargo", "git", "gitcl"] }

README.md

@@ -5,14 +5,122 @@
 
 A local diffing tool for decompilation projects.
 
-Currently supports:
+Supports:
 - PowerPC 750CL (GameCube & Wii)
 - MIPS (Nintendo 64)
 
+See [Usage](#usage) for more information.
+
 ![Symbol Screenshot](assets/screen-symbols.png)
 ![Diff Screenshot](assets/screen-diff.png)
 
-### License
+## Usage
+
+objdiff works by comparing two relocatable object files (`.o`). The objects are expected to have the same relative path
+from the "target" and "base" directories.
+
+For example, if the target ("expected") object is located at `build/asm/MetroTRK/mslsupp.o` and the base ("actual")
+object is located at `build/src/MetroTRK/mslsupp.o`, the following configuration would be used:
+
+- Target build directory: `build/asm`
+- Base build directory: `build/src`
+- Object: `MetroTRK/mslsupp.o`
+
+objdiff will then execute the build system from the project directory to build both objects:
+
+```sh
+$ make build/asm/MetroTRK/mslsupp.o # Only if "Build target object" is enabled
+$ make build/src/MetroTRK/mslsupp.o
+```
+
+The objects will then be compared and the results will be displayed in the UI.
+
+See [Configuration](#configuration) for more information.
+
+## Configuration
+
+While **not required** (most settings can be specified in the UI), projects can add an `objdiff.json` (or
+`objdiff.yaml`, `objdiff.yml`) file to configure the tool automatically. The configuration file must be located in
+the root project directory.
+
+If your project has a generator script (e.g. `configure.py`), it's recommended to generate the objdiff configuration
+file as well. You can then add `objdiff.json` to your `.gitignore` to prevent it from being committed.
+
+```json5
+// objdiff.json
+{
+  "custom_make": "ninja",
+
+  // Only required if objects use "path" instead of "target_path" and "base_path".
+  "target_dir": "build/asm",
+  "base_dir": "build/src",
+
+  "build_target": true,
+  "watch_patterns": [
+    "*.c",
+    "*.cp",
+    "*.cpp",
+    "*.h",
+    "*.hpp",
+    "*.py"
+  ],
+  "objects": [
+    {
+      "name": "main/MetroTRK/mslsupp",
+
+      // Option 1: Relative to target_dir and base_dir
+      "path": "MetroTRK/mslsupp.o",
+      // Option 2: Explicit paths from project root
+      // Useful for more complex directory layouts
+      "target_path": "build/asm/MetroTRK/mslsupp.o",
+      "base_path": "build/src/MetroTRK/mslsupp.o",
+      
+      "reverse_fn_order": false
+    },
+    // ...
+  ]
+}
+```
+
+`custom_make` _(optional)_: By default, objdiff will use `make` to build the project.  
+If the project uses a different build system (e.g. `ninja`), specify it here.
+
+`target_dir` _(optional)_: Relative from the root of the project, this where the "target" or "expected" objects are located.  
+These are the **intended result** of the match.
+
+`base_dir` _(optional)_: Relative from the root of the project, this is where the "base" or "actual" objects are located.  
+These are objects built from the **current source code**.
+
+`build_target`: If true, objdiff will tell the build system to build the target objects before diffing (e.g.
+  `make path/to/target.o`).  
+This is useful if the target objects are not built by default or can change based on project configuration or edits
+to assembly files.  
+Requires the build system to be configured properly.
+
+`watch_patterns` _(optional)_: A list of glob patterns to watch for changes.
+([Supported syntax](https://docs.rs/globset/latest/globset/#syntax))  
+If any of these files change, objdiff will automatically rebuild the objects and re-compare them.  
+If not specified, objdiff will use the default patterns listed above.
+
+`objects` _(optional)_: If specified, objdiff will display a list of objects in the sidebar for easy navigation.
+
+> `name` _(optional)_: The name of the object in the UI. If not specified, the object's `path` will be used.
+> 
+> `path`: Relative path to the object from the `target_dir` and `base_dir`.  
+> Requires `target_dir` and `base_dir` to be specified.
+> 
+> `target_path`: Path to the target object from the project root.  
+> Required if `path` is not specified.
+> 
+> `base_path`: Path to the base object from the project root.  
+> Required if `path` is not specified.
+> 
+> `reverse_fn_order` _(optional)_: Displays function symbols in reversed order.  
+Used to support MWCC's `-inline deferred` option, which reverses the order of functions in the object file.
+
+
+
+## License
 
 Licensed under either of
 
@@ -23,6 +131,5 @@ at your option.
 
 ### Contribution
 
-Unless you explicitly state otherwise, any contribution intentionally submitted
-for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any
-additional terms or conditions.
+Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as
+defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

src/app.rs

@@ -1,5 +1,6 @@
 use std::{
     default::Default,
+    fs,
     path::{Path, PathBuf},
     rc::Rc,
     sync::{
@@ -9,18 +10,21 @@ use std::{
     time::Duration,
 };
 
-use globset::{Glob, GlobSet, GlobSetBuilder};
+use filetime::FileTime;
+use globset::{Glob, GlobSet};
 use notify::{RecursiveMode, Watcher};
 use time::UtcOffset;
 
 use crate::{
-    config::{build_globset, load_project_config, ProjectUnit, ProjectUnitNode, CONFIG_FILENAMES},
+    app_config::{deserialize_config, AppConfigVersion},
+    config::{build_globset, load_project_config, ProjectObject, ProjectObjectNode},
     jobs::{
-        check_update::start_check_update, objdiff::start_build, Job, JobQueue, JobResult, JobStatus,
+        objdiff::{start_build, ObjDiffConfig},
+        Job, JobQueue, JobResult, JobStatus,
     },
     views::{
         appearance::{appearance_window, Appearance},
-        config::{config_ui, project_window, ConfigViewState},
+        config::{config_ui, project_window, ConfigViewState, DEFAULT_WATCH_PATTERNS},
         data_diff::data_diff_ui,
         demangle::{demangle_window, DemangleViewState},
         function_diff::function_diff_ui,
@@ -32,85 +36,172 @@ use crate::{
 #[derive(Default)]
 pub struct ViewState {
     pub jobs: JobQueue,
-    pub show_appearance_config: bool,
-    pub demangle_state: DemangleViewState,
-    pub show_demangle: bool,
-    pub diff_state: DiffViewState,
     pub config_state: ConfigViewState,
+    pub demangle_state: DemangleViewState,
+    pub diff_state: DiffViewState,
+    pub show_appearance_config: bool,
+    pub show_demangle: bool,
     pub show_project_config: bool,
 }
 
-#[derive(Default, Clone, serde::Deserialize, serde::Serialize)]
+/// The configuration for a single object file.
+#[derive(Clone, Eq, PartialEq, serde::Deserialize, serde::Serialize)]
+pub struct ObjectConfig {
+    pub name: String,
+    pub target_path: Option<PathBuf>,
+    pub base_path: Option<PathBuf>,
+    pub reverse_fn_order: Option<bool>,
+    pub complete: Option<bool>,
+}
+
+#[derive(Clone, Eq, PartialEq)]
+pub struct ProjectConfigInfo {
+    pub path: PathBuf,
+    pub timestamp: FileTime,
+}
+
+#[inline]
+fn bool_true() -> bool { true }
+
+#[inline]
+fn default_watch_patterns() -> Vec<Glob> {
+    DEFAULT_WATCH_PATTERNS.iter().map(|s| Glob::new(s).unwrap()).collect()
+}
+
+#[derive(Clone, serde::Deserialize, serde::Serialize)]
 pub struct AppConfig {
+    // TODO: https://github.com/ron-rs/ron/pull/455
+    // #[serde(flatten)]
+    // pub version: AppConfigVersion,
+    pub version: u32,
+    #[serde(default)]
     pub custom_make: Option<String>,
+    #[serde(default)]
     pub selected_wsl_distro: Option<String>,
+    #[serde(default)]
     pub project_dir: Option<PathBuf>,
+    #[serde(default)]
     pub target_obj_dir: Option<PathBuf>,
+    #[serde(default)]
     pub base_obj_dir: Option<PathBuf>,
-    pub obj_path: Option<String>,
+    #[serde(default)]
+    pub selected_obj: Option<ObjectConfig>,
+    #[serde(default = "bool_true")]
+    pub build_base: bool,
+    #[serde(default)]
     pub build_target: bool,
-    pub watcher_enabled: bool,
+    #[serde(default = "bool_true")]
+    pub rebuild_on_changes: bool,
+    #[serde(default)]
     pub auto_update_check: bool,
+    #[serde(default = "default_watch_patterns")]
     pub watch_patterns: Vec<Glob>,
+    #[serde(default)]
+    pub recent_projects: Vec<PathBuf>,
 
     #[serde(skip)]
-    pub units: Vec<ProjectUnit>,
+    pub objects: Vec<ProjectObject>,
     #[serde(skip)]
-    pub unit_nodes: Vec<ProjectUnitNode>,
+    pub object_nodes: Vec<ProjectObjectNode>,
     #[serde(skip)]
     pub watcher_change: bool,
     #[serde(skip)]
     pub config_change: bool,
     #[serde(skip)]
     pub obj_change: bool,
+    #[serde(skip)]
+    pub queue_build: bool,
+    #[serde(skip)]
+    pub queue_reload: bool,
+    #[serde(skip)]
+    pub project_config_info: Option<ProjectConfigInfo>,
+}
+
+impl Default for AppConfig {
+    fn default() -> Self {
+        Self {
+            version: AppConfigVersion::default().version,
+            custom_make: None,
+            selected_wsl_distro: None,
+            project_dir: None,
+            target_obj_dir: None,
+            base_obj_dir: None,
+            selected_obj: None,
+            build_base: true,
+            build_target: false,
+            rebuild_on_changes: true,
+            auto_update_check: true,
+            watch_patterns: DEFAULT_WATCH_PATTERNS.iter().map(|s| Glob::new(s).unwrap()).collect(),
+            recent_projects: vec![],
+            objects: vec![],
+            object_nodes: vec![],
+            watcher_change: false,
+            config_change: false,
+            obj_change: false,
+            queue_build: false,
+            queue_reload: false,
+            project_config_info: None,
+        }
+    }
 }
 
 impl AppConfig {
     pub fn set_project_dir(&mut self, path: PathBuf) {
+        self.recent_projects.retain(|p| p != &path);
+        if self.recent_projects.len() > 9 {
+            self.recent_projects.truncate(9);
+        }
+        self.recent_projects.insert(0, path.clone());
         self.project_dir = Some(path);
         self.target_obj_dir = None;
         self.base_obj_dir = None;
-        self.obj_path = None;
+        self.selected_obj = None;
         self.build_target = false;
-        self.units.clear();
-        self.unit_nodes.clear();
+        self.objects.clear();
+        self.object_nodes.clear();
         self.watcher_change = true;
         self.config_change = true;
         self.obj_change = true;
+        self.queue_build = false;
+        self.project_config_info = None;
     }
 
     pub fn set_target_obj_dir(&mut self, path: PathBuf) {
         self.target_obj_dir = Some(path);
-        self.obj_path = None;
+        self.selected_obj = None;
         self.obj_change = true;
+        self.queue_build = false;
     }
 
     pub fn set_base_obj_dir(&mut self, path: PathBuf) {
         self.base_obj_dir = Some(path);
-        self.obj_path = None;
+        self.selected_obj = None;
         self.obj_change = true;
+        self.queue_build = false;
     }
 
-    pub fn set_obj_path(&mut self, path: String) {
-        self.obj_path = Some(path);
+    pub fn set_selected_obj(&mut self, object: ObjectConfig) {
+        self.selected_obj = Some(object);
         self.obj_change = true;
+        self.queue_build = false;
     }
 }
 
+pub type AppConfigRef = Arc<RwLock<AppConfig>>;
+
 #[derive(Default)]
 pub struct App {
     appearance: Appearance,
     view_state: ViewState,
-    config: Arc<RwLock<AppConfig>>,
+    config: AppConfigRef,
     modified: Arc<AtomicBool>,
-    config_modified: Arc<AtomicBool>,
     watcher: Option<notify::RecommendedWatcher>,
     relaunch_path: Rc<Mutex<Option<PathBuf>>>,
     should_relaunch: bool,
 }
 
-const APPEARANCE_KEY: &str = "appearance";
-const CONFIG_KEY: &str = "app_config";
+pub const APPEARANCE_KEY: &str = "appearance";
+pub const CONFIG_KEY: &str = "app_config";
 
 impl App {
     /// Called once before the first frame.
@@ -129,13 +220,13 @@ impl App {
             if let Some(appearance) = eframe::get_value::<Appearance>(storage, APPEARANCE_KEY) {
                 app.appearance = appearance;
             }
-            if let Some(mut config) = eframe::get_value::<AppConfig>(storage, CONFIG_KEY) {
+            if let Some(mut config) = deserialize_config(storage) {
                 if config.project_dir.is_some() {
                     config.config_change = true;
                     config.watcher_change = true;
                     app.modified.store(true, Ordering::Relaxed);
                 }
-                app.view_state.config_state.queue_update_check = config.auto_update_check;
+                app.view_state.config_state.queue_check_update = config.auto_update_check;
                 app.config = Arc::new(RwLock::new(config));
             }
         }
@@ -147,6 +238,7 @@ impl App {
     fn pre_update(&mut self) {
         let ViewState { jobs, diff_state, config_state, .. } = &mut self.view_state;
 
+        let mut results = vec![];
         for (job, result) in jobs.iter_finished() {
             match result {
                 Ok(result) => {
@@ -157,18 +249,13 @@ impl App {
                                 log::error!("{:?}", err);
                             }
                         }
-                        JobResult::ObjDiff(state) => {
-                            diff_state.build = Some(state);
-                        }
-                        JobResult::CheckUpdate(state) => {
-                            config_state.check_update = Some(state);
-                        }
                         JobResult::Update(state) => {
                             if let Ok(mut guard) = self.relaunch_path.lock() {
                                 *guard = Some(state.exe_path);
                             }
                             self.should_relaunch = true;
                         }
+                        _ => results.push(result),
                     }
                 }
                 Err(err) => {
@@ -195,18 +282,28 @@ impl App {
                 }
             }
         }
+        jobs.results.append(&mut results);
         jobs.clear_finished();
+
+        diff_state.pre_update(jobs, &self.config);
+        config_state.pre_update(jobs);
+        debug_assert!(jobs.results.is_empty());
     }
 
     fn post_update(&mut self) {
         let ViewState { jobs, diff_state, config_state, .. } = &mut self.view_state;
+        config_state.post_update(jobs, &self.config);
+        diff_state.post_update(jobs, &self.config);
+
         let Ok(mut config) = self.config.write() else {
             return;
         };
         let config = &mut *config;
 
-        if self.config_modified.swap(false, Ordering::Relaxed) {
-            config.config_change = true;
+        if let Some(info) = &config.project_config_info {
+            if file_modified(&info.path, info.timestamp) {
+                config.config_change = true;
+            }
         }
 
         if config.config_change {
@@ -224,42 +321,57 @@ impl App {
             drop(self.watcher.take());
 
             if let Some(project_dir) = &config.project_dir {
-                if !config.watch_patterns.is_empty() {
-                    match build_globset(&config.watch_patterns)
-                        .map_err(anyhow::Error::new)
-                        .and_then(|globset| {
-                            create_watcher(
-                                self.modified.clone(),
-                                self.config_modified.clone(),
-                                project_dir,
-                                globset,
-                            )
+                match build_globset(&config.watch_patterns).map_err(anyhow::Error::new).and_then(
+                    |globset| {
+                        create_watcher(self.modified.clone(), project_dir, globset)
                             .map_err(anyhow::Error::new)
-                        }) {
-                        Ok(watcher) => self.watcher = Some(watcher),
-                        Err(e) => log::error!("Failed to create watcher: {e}"),
-                    }
+                    },
+                ) {
+                    Ok(watcher) => self.watcher = Some(watcher),
+                    Err(e) => log::error!("Failed to create watcher: {e}"),
                 }
                 config.watcher_change = false;
             }
         }
 
-        if config.obj_path.is_some()
-            && self.modified.swap(false, Ordering::Relaxed)
-            && !jobs.is_running(Job::ObjDiff)
-        {
-            jobs.push(start_build(self.config.clone()));
-        }
-
         if config.obj_change {
             *diff_state = Default::default();
-            jobs.push(start_build(self.config.clone()));
+            if config.selected_obj.is_some() {
+                config.queue_build = true;
+            }
             config.obj_change = false;
         }
 
-        if config_state.queue_update_check {
-            jobs.push(start_check_update());
-            config_state.queue_update_check = false;
+        if self.modified.swap(false, Ordering::Relaxed) && config.rebuild_on_changes {
+            config.queue_build = true;
+        }
+
+        if let Some(result) = &diff_state.build {
+            if let Some(obj) = &result.first_obj {
+                if file_modified(&obj.path, obj.timestamp) {
+                    config.queue_reload = true;
+                }
+            }
+            if let Some(obj) = &result.second_obj {
+                if file_modified(&obj.path, obj.timestamp) {
+                    config.queue_reload = true;
+                }
+            }
+        }
+
+        // Don't clear `queue_build` if a build is running. A file may have been modified during
+        // the build, so we'll start another build after the current one finishes.
+        if config.queue_build && config.selected_obj.is_some() && !jobs.is_running(Job::ObjDiff) {
+            jobs.push(start_build(ObjDiffConfig::from_config(config)));
+            config.queue_build = false;
+            config.queue_reload = false;
+        } else if config.queue_reload && !jobs.is_running(Job::ObjDiff) {
+            let mut diff_config = ObjDiffConfig::from_config(config);
+            // Don't build, just reload the current files
+            diff_config.build_base = false;
+            diff_config.build_target = false;
+            jobs.push(start_build(diff_config));
+            config.queue_reload = false;
         }
     }
 }
@@ -291,6 +403,31 @@ impl eframe::App for App {
         egui::TopBottomPanel::top("top_panel").show(ctx, |ui| {
             egui::menu::bar(ui, |ui| {
                 ui.menu_button("File", |ui| {
+                    if ui.button("Project…").clicked() {
+                        *show_project_config = !*show_project_config;
+                        ui.close_menu();
+                    }
+                    let recent_projects = if let Ok(guard) = config.read() {
+                        guard.recent_projects.clone()
+                    } else {
+                        vec![]
+                    };
+                    if recent_projects.is_empty() {
+                        ui.add_enabled(false, egui::Button::new("Recent projects…"));
+                    } else {
+                        ui.menu_button("Recent Projects…", |ui| {
+                            if ui.button("Clear").clicked() {
+                                config.write().unwrap().recent_projects.clear();
+                            };
+                            ui.separator();
+                            for path in recent_projects {
+                                if ui.button(format!("{}", path.display())).clicked() {
+                                    config.write().unwrap().set_project_dir(path);
+                                    ui.close_menu();
+                                }
+                            }
+                        });
+                    }
                     if ui.button("Appearance…").clicked() {
                         *show_appearance_config = !*show_appearance_config;
                         ui.close_menu();
@@ -305,29 +442,45 @@ impl eframe::App for App {
                         ui.close_menu();
                     }
                 });
+                ui.menu_button("Diff Options", |ui| {
+                    let mut config = config.write().unwrap();
+                    let response = ui
+                        .checkbox(&mut config.rebuild_on_changes, "Rebuild on changes")
+                        .on_hover_text("Automatically re-run the build & diff when files change.");
+                    if response.changed() {
+                        config.watcher_change = true;
+                    };
+                    ui.add_enabled(
+                        !diff_state.symbol_state.disable_reverse_fn_order,
+                        egui::Checkbox::new(
+                            &mut diff_state.symbol_state.reverse_fn_order,
+                            "Reverse function order (-inline deferred)",
+                        ),
+                    )
+                    .on_disabled_hover_text(
+                        "Option disabled because it's set by the project configuration file.",
+                    );
+                    ui.checkbox(
+                        &mut diff_state.symbol_state.show_hidden_symbols,
+                        "Show hidden symbols",
+                    );
+                });
             });
         });
 
-        if diff_state.current_view == View::FunctionDiff
-            && matches!(&diff_state.build, Some(b) if b.first_status.success && b.second_status.success)
-        {
+        let build_success = matches!(&diff_state.build, Some(b) if b.first_status.success && b.second_status.success);
+        if diff_state.current_view == View::FunctionDiff && build_success {
             egui::CentralPanel::default().show(ctx, |ui| {
-                if function_diff_ui(ui, jobs, diff_state, appearance) {
-                    jobs.push(start_build(config.clone()));
-                }
+                function_diff_ui(ui, diff_state, appearance);
             });
-        } else if diff_state.current_view == View::DataDiff
-            && matches!(&diff_state.build, Some(b) if b.first_status.success && b.second_status.success)
-        {
+        } else if diff_state.current_view == View::DataDiff && build_success {
             egui::CentralPanel::default().show(ctx, |ui| {
-                if data_diff_ui(ui, jobs, diff_state, appearance) {
-                    jobs.push(start_build(config.clone()));
-                }
+                data_diff_ui(ui, diff_state, appearance);
             });
         } else {
             egui::SidePanel::left("side_panel").show(ctx, |ui| {
                 egui::ScrollArea::both().show(ui, |ui| {
-                    config_ui(ui, config, jobs, show_project_config, config_state, appearance);
+                    config_ui(ui, config, show_project_config, config_state, appearance);
                     jobs_ui(ui, jobs, appearance);
                 });
             });
@@ -363,24 +516,23 @@ impl eframe::App for App {
 
 fn create_watcher(
     modified: Arc<AtomicBool>,
-    config_modified: Arc<AtomicBool>,
     project_dir: &Path,
     patterns: GlobSet,
 ) -> notify::Result<notify::RecommendedWatcher> {
-    let mut config_patterns = GlobSetBuilder::new();
-    for filename in CONFIG_FILENAMES {
-        config_patterns.add(Glob::new(&format!("**/{filename}")).unwrap());
-    }
-    let config_patterns = config_patterns.build().unwrap();
-
+    let base_dir = project_dir.to_owned();
     let mut watcher =
         notify::recommended_watcher(move |res: notify::Result<notify::Event>| match res {
             Ok(event) => {
-                if matches!(event.kind, notify::EventKind::Modify(..)) {
+                if matches!(
+                    event.kind,
+                    notify::EventKind::Modify(..)
+                        | notify::EventKind::Create(..)
+                        | notify::EventKind::Remove(..)
+                ) {
                     for path in &event.paths {
-                        if config_patterns.is_match(path) {
-                            config_modified.store(true, Ordering::Relaxed);
-                        }
+                        let Ok(path) = path.strip_prefix(&base_dir) else {
+                            continue;
+                        };
                         if patterns.is_match(path) {
                             modified.store(true, Ordering::Relaxed);
                         }
@@ -392,3 +544,12 @@ fn create_watcher(
     watcher.watch(project_dir, RecursiveMode::Recursive)?;
     Ok(watcher)
 }
+
+#[inline]
+fn file_modified(path: &Path, last_ts: FileTime) -> bool {
+    if let Ok(metadata) = fs::metadata(path) {
+        FileTime::from_last_modification_time(&metadata) != last_ts
+    } else {
+        false
+    }
+}

src/app_config.rs

@@ -0,0 +1,96 @@
+use std::path::PathBuf;
+
+use eframe::Storage;
+use globset::Glob;
+
+use crate::app::{AppConfig, ObjectConfig, CONFIG_KEY};
+
+#[derive(Clone, serde::Deserialize, serde::Serialize)]
+pub struct AppConfigVersion {
+    pub version: u32,
+}
+
+impl Default for AppConfigVersion {
+    fn default() -> Self { Self { version: 1 } }
+}
+
+/// Deserialize the AppConfig from storage, handling upgrades from older versions.
+pub fn deserialize_config(storage: &dyn Storage) -> Option<AppConfig> {
+    let str = storage.get_string(CONFIG_KEY)?;
+    match ron::from_str::<AppConfigVersion>(&str) {
+        Ok(version) => match version.version {
+            1 => from_str::<AppConfig>(&str),
+            _ => {
+                log::warn!("Unknown config version: {}", version.version);
+                None
+            }
+        },
+        Err(e) => {
+            log::warn!("Failed to decode config version: {e}");
+            // Try to decode as v0
+            from_str::<AppConfigV0>(&str).map(|c| c.into_config())
+        }
+    }
+}
+
+fn from_str<T>(str: &str) -> Option<T>
+where T: serde::de::DeserializeOwned {
+    match ron::from_str(str) {
+        Ok(config) => Some(config),
+        Err(err) => {
+            log::warn!("Failed to decode config: {err}");
+            None
+        }
+    }
+}
+
+#[derive(serde::Deserialize, serde::Serialize)]
+pub struct ObjectConfigV0 {
+    pub name: String,
+    pub target_path: PathBuf,
+    pub base_path: PathBuf,
+    pub reverse_fn_order: Option<bool>,
+}
+
+impl ObjectConfigV0 {
+    fn into_config(self) -> ObjectConfig {
+        ObjectConfig {
+            name: self.name,
+            target_path: Some(self.target_path),
+            base_path: Some(self.base_path),
+            reverse_fn_order: self.reverse_fn_order,
+            complete: None,
+        }
+    }
+}
+
+#[derive(serde::Deserialize, serde::Serialize)]
+pub struct AppConfigV0 {
+    pub custom_make: Option<String>,
+    pub selected_wsl_distro: Option<String>,
+    pub project_dir: Option<PathBuf>,
+    pub target_obj_dir: Option<PathBuf>,
+    pub base_obj_dir: Option<PathBuf>,
+    pub selected_obj: Option<ObjectConfigV0>,
+    pub build_target: bool,
+    pub auto_update_check: bool,
+    pub watch_patterns: Vec<Glob>,
+}
+
+impl AppConfigV0 {
+    fn into_config(self) -> AppConfig {
+        log::info!("Upgrading configuration from v0");
+        AppConfig {
+            custom_make: self.custom_make,
+            selected_wsl_distro: self.selected_wsl_distro,
+            project_dir: self.project_dir,
+            target_obj_dir: self.target_obj_dir,
+            base_obj_dir: self.base_obj_dir,
+            selected_obj: self.selected_obj.map(|obj| obj.into_config()),
+            build_target: self.build_target,
+            auto_update_check: self.auto_update_check,
+            watch_patterns: self.watch_patterns,
+            ..Default::default()
+        }
+    }
+}

src/config.rs

@@ -1,60 +1,111 @@
 use std::{
     fs::File,
+    io::Read,
     path::{Component, Path, PathBuf},
 };
 
-use anyhow::{Context, Result};
+use anyhow::{bail, Result};
+use filetime::FileTime;
 use globset::{Glob, GlobSet, GlobSetBuilder};
 
-use crate::app::AppConfig;
+use crate::{
+    app::{AppConfig, ProjectConfigInfo},
+    views::config::DEFAULT_WATCH_PATTERNS,
+};
+
+#[inline]
+fn bool_true() -> bool { true }
 
 #[derive(Default, Clone, serde::Deserialize)]
-#[serde(default)]
 pub struct ProjectConfig {
+    #[serde(default)]
+    pub min_version: Option<String>,
+    #[serde(default)]
     pub custom_make: Option<String>,
+    #[serde(default)]
     pub target_dir: Option<PathBuf>,
+    #[serde(default)]
     pub base_dir: Option<PathBuf>,
+    #[serde(default = "bool_true")]
+    pub build_base: bool,
+    #[serde(default)]
     pub build_target: bool,
-    pub watch_patterns: Vec<Glob>,
-    pub units: Vec<ProjectUnit>,
+    #[serde(default)]
+    pub watch_patterns: Option<Vec<Glob>>,
+    #[serde(default, alias = "units")]
+    pub objects: Vec<ProjectObject>,
 }
 
 #[derive(Default, Clone, serde::Deserialize)]
-pub struct ProjectUnit {
-    pub name: String,
-    pub path: PathBuf,
+pub struct ProjectObject {
     #[serde(default)]
-    pub reverse_fn_order: bool,
+    pub name: Option<String>,
+    #[serde(default)]
+    pub path: Option<PathBuf>,
+    #[serde(default)]
+    pub target_path: Option<PathBuf>,
+    #[serde(default)]
+    pub base_path: Option<PathBuf>,
+    #[serde(default)]
+    pub reverse_fn_order: Option<bool>,
+    #[serde(default)]
+    pub complete: Option<bool>,
+}
+
+impl ProjectObject {
+    pub fn name(&self) -> &str {
+        if let Some(name) = &self.name {
+            name
+        } else if let Some(path) = &self.path {
+            path.to_str().unwrap_or("[invalid path]")
+        } else {
+            "[unknown]"
+        }
+    }
 }
 
 #[derive(Clone)]
-pub enum ProjectUnitNode {
-    File(String, ProjectUnit),
-    Dir(String, Vec<ProjectUnitNode>),
+pub enum ProjectObjectNode {
+    File(String, ProjectObject),
+    Dir(String, Vec<ProjectObjectNode>),
 }
 
-fn find_dir<'a>(name: &str, nodes: &'a mut Vec<ProjectUnitNode>) -> &'a mut Vec<ProjectUnitNode> {
+fn find_dir<'a>(
+    name: &str,
+    nodes: &'a mut Vec<ProjectObjectNode>,
+) -> &'a mut Vec<ProjectObjectNode> {
     if let Some(index) = nodes
         .iter()
-        .position(|node| matches!(node, ProjectUnitNode::Dir(dir_name, _) if dir_name == name))
+        .position(|node| matches!(node, ProjectObjectNode::Dir(dir_name, _) if dir_name == name))
     {
-        if let ProjectUnitNode::Dir(_, children) = &mut nodes[index] {
+        if let ProjectObjectNode::Dir(_, children) = &mut nodes[index] {
             return children;
         }
     } else {
-        nodes.push(ProjectUnitNode::Dir(name.to_string(), vec![]));
-        if let Some(ProjectUnitNode::Dir(_, children)) = nodes.last_mut() {
+        nodes.push(ProjectObjectNode::Dir(name.to_string(), vec![]));
+        if let Some(ProjectObjectNode::Dir(_, children)) = nodes.last_mut() {
             return children;
         }
     }
     unreachable!();
 }
 
-fn build_nodes(units: &[ProjectUnit]) -> Vec<ProjectUnitNode> {
+fn build_nodes(
+    objects: &[ProjectObject],
+    project_dir: &Path,
+    target_obj_dir: &Option<PathBuf>,
+    base_obj_dir: &Option<PathBuf>,
+) -> Vec<ProjectObjectNode> {
     let mut nodes = vec![];
-    for unit in units {
+    for object in objects {
         let mut out_nodes = &mut nodes;
-        let path = Path::new(&unit.name);
+        let path = if let Some(name) = &object.name {
+            Path::new(name)
+        } else if let Some(path) = &object.path {
+            path
+        } else {
+            continue;
+        };
         if let Some(parent) = path.parent() {
             for component in parent.components() {
                 if let Component::Normal(name) = component {
@@ -63,8 +114,23 @@ fn build_nodes(units: &[ProjectUnit]) -> Vec<ProjectUnitNode> {
                 }
             }
         }
+        let mut object = object.clone();
+        if let (Some(target_obj_dir), Some(path), None) =
+            (target_obj_dir, &object.path, &object.target_path)
+        {
+            object.target_path = Some(target_obj_dir.join(path));
+        } else if let Some(path) = &object.target_path {
+            object.target_path = Some(project_dir.join(path));
+        }
+        if let (Some(base_obj_dir), Some(path), None) =
+            (base_obj_dir, &object.path, &object.base_path)
+        {
+            object.base_path = Some(base_obj_dir.join(path));
+        } else if let Some(path) = &object.base_path {
+            object.base_path = Some(project_dir.join(path));
+        }
         let filename = path.file_name().unwrap().to_str().unwrap().to_string();
-        out_nodes.push(ProjectUnitNode::File(filename, unit.clone()));
+        out_nodes.push(ProjectObjectNode::File(filename, object));
     }
     nodes
 }
@@ -75,43 +141,61 @@ pub fn load_project_config(config: &mut AppConfig) -> Result<()> {
     let Some(project_dir) = &config.project_dir else {
         return Ok(());
     };
-    if let Some(result) = try_project_config(project_dir) {
+    if let Some((result, info)) = try_project_config(project_dir) {
         let project_config = result?;
+        if let Some(min_version) = &project_config.min_version {
+            let version_str = env!("CARGO_PKG_VERSION");
+            let version = semver::Version::parse(version_str).unwrap();
+            let version_req = semver::VersionReq::parse(&format!(">={min_version}"))?;
+            if !version_req.matches(&version) {
+                bail!("Project requires objdiff version {} or higher", min_version);
+            }
+        }
         config.custom_make = project_config.custom_make;
         config.target_obj_dir = project_config.target_dir.map(|p| project_dir.join(p));
         config.base_obj_dir = project_config.base_dir.map(|p| project_dir.join(p));
+        config.build_base = project_config.build_base;
         config.build_target = project_config.build_target;
-        config.watch_patterns = project_config.watch_patterns;
+        config.watch_patterns = project_config.watch_patterns.unwrap_or_else(|| {
+            DEFAULT_WATCH_PATTERNS.iter().map(|s| Glob::new(s).unwrap()).collect()
+        });
         config.watcher_change = true;
-        config.units = project_config.units;
-        config.unit_nodes = build_nodes(&config.units);
+        config.objects = project_config.objects;
+        config.object_nodes =
+            build_nodes(&config.objects, project_dir, &config.target_obj_dir, &config.base_obj_dir);
+        config.project_config_info = Some(info);
     }
     Ok(())
 }
 
-fn try_project_config(dir: &Path) -> Option<Result<ProjectConfig>> {
+fn try_project_config(dir: &Path) -> Option<(Result<ProjectConfig>, ProjectConfigInfo)> {
     for filename in CONFIG_FILENAMES.iter() {
         let config_path = dir.join(filename);
-        if config_path.is_file() {
-            return match filename.contains("json") {
-                true => Some(read_json_config(&config_path)),
-                false => Some(read_yml_config(&config_path)),
+        let Ok(mut file) = File::open(&config_path) else {
+            continue;
+        };
+        let metadata = file.metadata();
+        if let Ok(metadata) = metadata {
+            if !metadata.is_file() {
+                continue;
+            }
+            let ts = FileTime::from_last_modification_time(&metadata);
+            let config = match filename.contains("json") {
+                true => read_json_config(&mut file),
+                false => read_yml_config(&mut file),
             };
+            return Some((config, ProjectConfigInfo { path: config_path, timestamp: ts }));
         }
     }
     None
 }
 
-fn read_yml_config(config_path: &Path) -> Result<ProjectConfig> {
-    let mut reader = File::open(config_path)
-        .with_context(|| format!("Failed to open config file '{}'", config_path.display()))?;
-    Ok(serde_yaml::from_reader(&mut reader)?)
+fn read_yml_config<R: Read>(reader: &mut R) -> Result<ProjectConfig> {
+    Ok(serde_yaml::from_reader(reader)?)
 }
 
-fn read_json_config(config_path: &Path) -> Result<ProjectConfig> {
-    let mut reader = File::open(config_path)
-        .with_context(|| format!("Failed to open config file '{}'", config_path.display()))?;
-    Ok(serde_json::from_reader(&mut reader)?)
+fn read_json_config<R: Read>(reader: &mut R) -> Result<ProjectConfig> {
+    Ok(serde_json::from_reader(reader)?)
 }
 
 pub fn build_globset(vec: &[Glob]) -> std::result::Result<GlobSet, globset::Error> {

src/diff.rs

@@ -372,66 +372,80 @@ fn find_section_and_symbol(obj: &ObjInfo, name: &str) -> Option<(usize, usize)>
     None
 }
 
-pub fn diff_objs(left: &mut ObjInfo, right: &mut ObjInfo) -> Result<()> {
-    for left_section in &mut left.sections {
-        if left_section.kind == ObjSectionKind::Code {
-            for left_symbol in &mut left_section.symbols {
-                if let Some((right_section_idx, right_symbol_idx)) =
-                    find_section_and_symbol(right, &left_symbol.name)
-                {
-                    let right_section = &mut right.sections[right_section_idx];
-                    let right_symbol = &mut right_section.symbols[right_symbol_idx];
-                    left_symbol.diff_symbol = Some(right_symbol.name.clone());
-                    right_symbol.diff_symbol = Some(left_symbol.name.clone());
-                    diff_code(
-                        left.architecture,
-                        &left_section.data,
-                        &right_section.data,
-                        left_symbol,
-                        right_symbol,
-                        &left_section.relocations,
-                        &right_section.relocations,
-                        &left.line_info,
-                        &right.line_info,
-                    )?;
-                } else {
-                    no_diff_code(
-                        left.architecture,
-                        &left_section.data,
-                        left_symbol,
-                        &left_section.relocations,
-                        &left.line_info,
-                    )?;
+pub fn diff_objs(mut left: Option<&mut ObjInfo>, mut right: Option<&mut ObjInfo>) -> Result<()> {
+    if let Some(left) = left.as_mut() {
+        for left_section in &mut left.sections {
+            if left_section.kind == ObjSectionKind::Code {
+                for left_symbol in &mut left_section.symbols {
+                    if let Some((right, (right_section_idx, right_symbol_idx))) =
+                        right.as_mut().and_then(|obj| {
+                            find_section_and_symbol(obj, &left_symbol.name).map(|s| (obj, s))
+                        })
+                    {
+                        let right_section = &mut right.sections[right_section_idx];
+                        let right_symbol = &mut right_section.symbols[right_symbol_idx];
+                        left_symbol.diff_symbol = Some(right_symbol.name.clone());
+                        right_symbol.diff_symbol = Some(left_symbol.name.clone());
+                        diff_code(
+                            left.architecture,
+                            &left_section.data,
+                            &right_section.data,
+                            left_symbol,
+                            right_symbol,
+                            &left_section.relocations,
+                            &right_section.relocations,
+                            &left.line_info,
+                            &right.line_info,
+                        )?;
+                    } else {
+                        no_diff_code(
+                            left.architecture,
+                            &left_section.data,
+                            left_symbol,
+                            &left_section.relocations,
+                            &left.line_info,
+                        )?;
+                    }
                 }
-            }
-        } else {
-            let Some(right_section) =
-                right.sections.iter_mut().find(|s| s.name == left_section.name)
-            else {
-                continue;
-            };
-            if left_section.kind == ObjSectionKind::Data {
-                diff_data(left_section, right_section);
-                // diff_data_symbols(left_section, right_section)?;
-            } else if left_section.kind == ObjSectionKind::Bss {
-                diff_bss_symbols(&mut left_section.symbols, &mut right_section.symbols)?;
+            } else if let Some(right_section) = right
+                .as_mut()
+                .and_then(|obj| obj.sections.iter_mut().find(|s| s.name == left_section.name))
+            {
+                if left_section.kind == ObjSectionKind::Data {
+                    diff_data(left_section, right_section);
+                    // diff_data_symbols(left_section, right_section)?;
+                } else if left_section.kind == ObjSectionKind::Bss {
+                    diff_bss_symbols(&mut left_section.symbols, &mut right_section.symbols)?;
+                }
+            } else if left_section.kind == ObjSectionKind::Data {
+                no_diff_data(left_section);
             }
         }
     }
-    for right_section in right.sections.iter_mut().filter(|s| s.kind == ObjSectionKind::Code) {
-        for right_symbol in &mut right_section.symbols {
-            if right_symbol.instructions.is_empty() {
-                no_diff_code(
-                    right.architecture,
-                    &right_section.data,
-                    right_symbol,
-                    &right_section.relocations,
-                    &right.line_info,
-                )?;
+    if let Some(right) = right.as_mut() {
+        for right_section in right.sections.iter_mut() {
+            if right_section.kind == ObjSectionKind::Code {
+                for right_symbol in &mut right_section.symbols {
+                    if right_symbol.instructions.is_empty() {
+                        no_diff_code(
+                            right.architecture,
+                            &right_section.data,
+                            right_symbol,
+                            &right_section.relocations,
+                            &right.line_info,
+                        )?;
+                    }
+                }
+            } else if right_section.kind == ObjSectionKind::Data
+                && right_section.data_diff.is_empty()
+            {
+                no_diff_data(right_section);
             }
         }
     }
-    diff_bss_symbols(&mut left.common, &mut right.common)?;
+    if let (Some(left), Some(right)) = (left, right) {
+        diff_bss_symbols(&mut left.common, &mut right.common)?;
+    }
     Ok(())
 }
 
@@ -710,3 +724,12 @@ fn diff_data(left: &mut ObjSection, right: &mut ObjSection) {
     left.data_diff = left_diff;
     right.data_diff = right_diff;
 }
+
+fn no_diff_data(section: &mut ObjSection) {
+    section.data_diff = vec![ObjDataDiff {
+        data: section.data.clone(),
+        kind: ObjDataDiffKind::None,
+        len: section.data.len(),
+        symbol: String::new(),
+    }];
+}

src/jobs/check_update.rs

@@ -4,7 +4,7 @@ use anyhow::{Context, Result};
 use self_update::{cargo_crate_version, update::Release};
 
 use crate::{
-    jobs::{start_job, update_status, Job, JobResult, JobState, Status},
+    jobs::{start_job, update_status, Job, JobResult, JobState, JobStatusRef},
     update::{build_updater, BIN_NAME},
 };
 
@@ -14,7 +14,7 @@ pub struct CheckUpdateResult {
     pub found_binary: bool,
 }
 
-fn run_check_update(status: &Status, cancel: Receiver<()>) -> Result<Box<CheckUpdateResult>> {
+fn run_check_update(status: &JobStatusRef, cancel: Receiver<()>) -> Result<Box<CheckUpdateResult>> {
     update_status(status, "Fetching latest release".to_string(), 0, 1, &cancel)?;
     let updater = build_updater().context("Failed to create release updater")?;
     let latest_release = updater.get_latest_release()?;
@@ -28,6 +28,6 @@ fn run_check_update(status: &Status, cancel: Receiver<()>) -> Result<Box<CheckUp
 
 pub fn start_check_update() -> JobState {
     start_job("Check for updates", Job::CheckUpdate, move |status, cancel| {
-        run_check_update(status, cancel).map(JobResult::CheckUpdate)
+        run_check_update(status, cancel).map(|result| JobResult::CheckUpdate(Some(result)))
     })
 }

src/jobs/mod.rs

@@ -26,12 +26,22 @@ pub static JOB_ID: AtomicUsize = AtomicUsize::new(0);
 #[derive(Default)]
 pub struct JobQueue {
     pub jobs: Vec<JobState>,
+    pub results: Vec<JobResult>,
 }
 
 impl JobQueue {
     /// Adds a job to the queue.
+    #[inline]
     pub fn push(&mut self, state: JobState) { self.jobs.push(state); }
 
+    /// Adds a job to the queue if a job of the given kind is not already running.
+    #[inline]
+    pub fn push_once(&mut self, job: Job, func: impl FnOnce() -> JobState) {
+        if !self.is_running(job) {
+            self.push(func());
+        }
+    }
+
     /// Returns whether a job of the given kind is running.
     pub fn is_running(&self, kind: Job) -> bool {
         self.jobs.iter().any(|j| j.kind == kind && j.handle.is_some())
@@ -79,11 +89,13 @@ impl JobQueue {
     pub fn remove(&mut self, id: usize) { self.jobs.retain(|job| job.id != id); }
 }
 
+pub type JobStatusRef = Arc<RwLock<JobStatus>>;
+
 pub struct JobState {
     pub id: usize,
     pub kind: Job,
     pub handle: Option<JoinHandle<JobResult>>,
-    pub status: Arc<RwLock<JobStatus>>,
+    pub status: JobStatusRef,
     pub cancel: Sender<()>,
     pub should_remove: bool,
 }
@@ -99,8 +111,8 @@ pub struct JobStatus {
 
 pub enum JobResult {
     None,
-    ObjDiff(Box<ObjDiffResult>),
-    CheckUpdate(Box<CheckUpdateResult>),
+    ObjDiff(Option<Box<ObjDiffResult>>),
+    CheckUpdate(Option<Box<CheckUpdateResult>>),
     Update(Box<UpdateResult>),
 }
 
@@ -111,12 +123,10 @@ fn should_cancel(rx: &Receiver<()>) -> bool {
     }
 }
 
-type Status = Arc<RwLock<JobStatus>>;
-
 fn start_job(
     title: &str,
     kind: Job,
-    run: impl FnOnce(&Status, Receiver<()>) -> Result<JobResult> + Send + 'static,
+    run: impl FnOnce(&JobStatusRef, Receiver<()>) -> Result<JobResult> + Send + 'static,
 ) -> JobState {
     let status = Arc::new(RwLock::new(JobStatus {
         title: title.to_string(),
@@ -151,7 +161,7 @@ fn start_job(
 }
 
 fn update_status(
-    status: &Status,
+    status: &JobStatusRef,
     str: String,
     count: u32,
     total: u32,

src/jobs/objdiff.rs

@@ -1,17 +1,17 @@
 use std::{
-    path::Path,
+    path::{Path, PathBuf},
     process::Command,
     str::from_utf8,
-    sync::{mpsc::Receiver, Arc, RwLock},
+    sync::mpsc::Receiver,
 };
 
-use anyhow::{Context, Error, Result};
+use anyhow::{anyhow, Context, Error, Result};
 use time::OffsetDateTime;
 
 use crate::{
-    app::AppConfig,
+    app::{AppConfig, ObjectConfig},
     diff::diff_objs,
-    jobs::{start_job, update_status, Job, JobResult, JobState, Status},
+    jobs::{start_job, update_status, Job, JobResult, JobState, JobStatusRef},
     obj::{elf, ObjInfo},
 };
 
@@ -20,6 +20,28 @@ pub struct BuildStatus {
     pub log: String,
 }
 
+pub struct ObjDiffConfig {
+    pub build_base: bool,
+    pub build_target: bool,
+    pub custom_make: Option<String>,
+    pub project_dir: Option<PathBuf>,
+    pub selected_obj: Option<ObjectConfig>,
+    pub selected_wsl_distro: Option<String>,
+}
+
+impl ObjDiffConfig {
+    pub(crate) fn from_config(config: &AppConfig) -> Self {
+        ObjDiffConfig {
+            build_base: config.build_base,
+            build_target: config.build_target,
+            custom_make: config.custom_make.clone(),
+            project_dir: config.project_dir.clone(),
+            selected_obj: config.selected_obj.clone(),
+            selected_wsl_distro: config.selected_wsl_distro.clone(),
+        }
+    }
+}
+
 pub struct ObjDiffResult {
     pub first_status: BuildStatus,
     pub second_status: BuildStatus,
@@ -28,7 +50,7 @@ pub struct ObjDiffResult {
     pub time: OffsetDateTime,
 }
 
-fn run_make(cwd: &Path, arg: &Path, config: &AppConfig) -> BuildStatus {
+fn run_make(cwd: &Path, arg: &Path, config: &ObjDiffConfig) -> BuildStatus {
     match (|| -> Result<BuildStatus> {
         let make = config.custom_make.as_deref().unwrap_or("make");
         #[cfg(not(windows))]
@@ -76,67 +98,116 @@ fn run_make(cwd: &Path, arg: &Path, config: &AppConfig) -> BuildStatus {
 }
 
 fn run_build(
-    status: &Status,
+    status: &JobStatusRef,
     cancel: Receiver<()>,
-    config: Arc<RwLock<AppConfig>>,
+    config: ObjDiffConfig,
 ) -> Result<Box<ObjDiffResult>> {
-    let config = config.read().map_err(|_| Error::msg("Failed to lock app config"))?.clone();
-    let obj_path = config.obj_path.as_ref().ok_or_else(|| Error::msg("Missing obj path"))?;
+    let obj_config = config.selected_obj.as_ref().ok_or_else(|| Error::msg("Missing obj path"))?;
     let project_dir =
         config.project_dir.as_ref().ok_or_else(|| Error::msg("Missing project dir"))?;
-    let mut target_path = config
-        .target_obj_dir
-        .as_ref()
-        .ok_or_else(|| Error::msg("Missing target obj dir"))?
-        .to_owned();
-    target_path.push(obj_path);
-    let mut base_path =
-        config.base_obj_dir.as_ref().ok_or_else(|| Error::msg("Missing base obj dir"))?.to_owned();
-    base_path.push(obj_path);
-    let target_path_rel = target_path
-        .strip_prefix(project_dir)
-        .context("Failed to create relative target obj path")?;
-    let base_path_rel =
-        base_path.strip_prefix(project_dir).context("Failed to create relative base obj path")?;
-
-    let total = if config.build_target { 5 } else { 4 };
-    let first_status = if config.build_target {
-        update_status(status, format!("Building target {obj_path}"), 0, total, &cancel)?;
-        run_make(project_dir, target_path_rel, &config)
+    let target_path_rel = if let Some(target_path) = &obj_config.target_path {
+        Some(target_path.strip_prefix(project_dir).map_err(|_| {
+            anyhow!(
+                "Target path '{}' doesn't begin with '{}'",
+                target_path.display(),
+                project_dir.display()
+            )
+        })?)
     } else {
-        BuildStatus { success: true, log: String::new() }
+        None
+    };
+    let base_path_rel = if let Some(base_path) = &obj_config.base_path {
+        Some(base_path.strip_prefix(project_dir).map_err(|_| {
+            anyhow!(
+                "Base path '{}' doesn't begin with '{}'",
+                base_path.display(),
+                project_dir.display()
+            )
+        })?)
+    } else {
+        None
     };
 
-    update_status(status, format!("Building base {obj_path}"), 1, total, &cancel)?;
-    let second_status = run_make(project_dir, base_path_rel, &config);
+    let mut total = 3;
+    if config.build_target && target_path_rel.is_some() {
+        total += 1;
+    }
+    if config.build_base && base_path_rel.is_some() {
+        total += 1;
+    }
+    let first_status = match target_path_rel {
+        Some(target_path_rel) if config.build_target => {
+            update_status(
+                status,
+                format!("Building target {}", target_path_rel.display()),
+                0,
+                total,
+                &cancel,
+            )?;
+            run_make(project_dir, target_path_rel, &config)
+        }
+        _ => BuildStatus { success: true, log: String::new() },
+    };
+
+    let second_status = match base_path_rel {
+        Some(base_path_rel) if config.build_base => {
+            update_status(
+                status,
+                format!("Building base {}", base_path_rel.display()),
+                0,
+                total,
+                &cancel,
+            )?;
+            run_make(project_dir, base_path_rel, &config)
+        }
+        _ => BuildStatus { success: true, log: String::new() },
+    };
 
     let time = OffsetDateTime::now_utc();
 
-    let mut first_obj = if first_status.success {
-        update_status(status, format!("Loading target {obj_path}"), 2, total, &cancel)?;
-        Some(elf::read(&target_path)?)
-    } else {
-        None
+    let mut first_obj =
+        match &obj_config.target_path {
+            Some(target_path) if first_status.success => {
+                update_status(
+                    status,
+                    format!("Loading target {}", target_path_rel.unwrap().display()),
+                    2,
+                    total,
+                    &cancel,
+                )?;
+                Some(elf::read(target_path).with_context(|| {
+                    format!("Failed to read object '{}'", target_path.display())
+                })?)
+            }
+            _ => None,
+        };
+
+    let mut second_obj = match &obj_config.base_path {
+        Some(base_path) if second_status.success => {
+            update_status(
+                status,
+                format!("Loading base {}", base_path_rel.unwrap().display()),
+                3,
+                total,
+                &cancel,
+            )?;
+            Some(
+                elf::read(base_path)
+                    .with_context(|| format!("Failed to read object '{}'", base_path.display()))?,
+            )
+        }
+        _ => None,
     };
 
-    let mut second_obj = if second_status.success {
-        update_status(status, format!("Loading base {obj_path}"), 3, total, &cancel)?;
-        Some(elf::read(&base_path)?)
-    } else {
-        None
-    };
-
-    if let (Some(first_obj), Some(second_obj)) = (&mut first_obj, &mut second_obj) {
-        update_status(status, "Performing diff".to_string(), 4, total, &cancel)?;
-        diff_objs(first_obj, second_obj)?;
-    }
+    update_status(status, "Performing diff".to_string(), 4, total, &cancel)?;
+    diff_objs(first_obj.as_mut(), second_obj.as_mut())?;
 
     update_status(status, "Complete".to_string(), total, total, &cancel)?;
     Ok(Box::new(ObjDiffResult { first_status, second_status, first_obj, second_obj, time }))
 }
 
-pub fn start_build(config: Arc<RwLock<AppConfig>>) -> JobState {
+pub fn start_build(config: ObjDiffConfig) -> JobState {
     start_job("Object diff", Job::ObjDiff, move |status, cancel| {
-        run_build(status, cancel, config).map(JobResult::ObjDiff)
+        run_build(status, cancel, config).map(|result| JobResult::ObjDiff(Some(result)))
     })
 }

src/jobs/update.rs

@@ -9,7 +9,7 @@ use anyhow::{Context, Result};
 use const_format::formatcp;
 
 use crate::{
-    jobs::{start_job, update_status, Job, JobResult, JobState, Status},
+    jobs::{start_job, update_status, Job, JobResult, JobState, JobStatusRef},
     update::{build_updater, BIN_NAME},
 };
 
@@ -17,7 +17,7 @@ pub struct UpdateResult {
     pub exe_path: PathBuf,
 }
 
-fn run_update(status: &Status, cancel: Receiver<()>) -> Result<Box<UpdateResult>> {
+fn run_update(status: &JobStatusRef, cancel: Receiver<()>) -> Result<Box<UpdateResult>> {
     update_status(status, "Fetching latest release".to_string(), 0, 3, &cancel)?;
     let updater = build_updater().context("Failed to create release updater")?;
     let latest_release = updater.get_latest_release()?;

src/lib.rs

@@ -3,6 +3,7 @@
 pub use app::App;
 
 mod app;
+mod app_config;
 mod config;
 mod diff;
 mod editops;

src/obj/elf.rs

@@ -3,10 +3,11 @@ use std::{collections::BTreeMap, fs, io::Cursor, path::Path};
 use anyhow::{anyhow, bail, Context, Result};
 use byteorder::{BigEndian, ReadBytesExt};
 use cwdemangle::demangle;
+use filetime::FileTime;
 use flagset::Flags;
 use object::{
     elf, Architecture, File, Object, ObjectSection, ObjectSymbol, RelocationKind, RelocationTarget,
-    SectionIndex, SectionKind, Symbol, SymbolKind, SymbolSection,
+    SectionIndex, SectionKind, Symbol, SymbolKind, SymbolScope, SymbolSection,
 };
 
 use crate::obj::{
@@ -42,6 +43,9 @@ fn to_obj_symbol(obj_file: &File<'_>, symbol: &Symbol<'_, '_>, addend: i64) -> R
     if symbol.is_weak() {
         flags = ObjSymbolFlagSet(flags.0 | ObjSymbolFlags::Weak);
     }
+    if symbol.scope() == SymbolScope::Linkage {
+        flags = ObjSymbolFlagSet(flags.0 | ObjSymbolFlags::Hidden);
+    }
     let section_address = if let Some(section) =
         symbol.section_index().and_then(|idx| obj_file.section_by_index(idx).ok())
     {
@@ -301,9 +305,10 @@ fn line_info(obj_file: &File<'_>) -> Result<Option<BTreeMap<u32, u32>>> {
 }
 
 pub fn read(obj_path: &Path) -> Result<ObjInfo> {
-    let data = {
+    let (data, timestamp) = {
         let file = fs::File::open(obj_path)?;
-        unsafe { memmap2::Mmap::map(&file) }?
+        let timestamp = FileTime::from_last_modification_time(&file.metadata()?);
+        (unsafe { memmap2::Mmap::map(&file) }?, timestamp)
     };
     let obj_file = File::parse(&*data)?;
     let architecture = match obj_file.architecture() {
@@ -319,6 +324,7 @@ pub fn read(obj_path: &Path) -> Result<ObjInfo> {
     let mut result = ObjInfo {
         architecture,
         path: obj_path.to_owned(),
+        timestamp,
         sections: filter_sections(&obj_file)?,
         common: common_symbols(&obj_file)?,
         line_info: line_info(&obj_file)?,

src/obj/mips.rs

@@ -91,6 +91,7 @@ pub fn process_code(
             reloc: reloc.cloned(),
             branch_dest,
             line,
+            orig: None,
         });
         cur_addr += 4;
     }

src/obj/mod.rs

@@ -4,6 +4,7 @@ pub mod ppc;
 
 use std::{collections::BTreeMap, path::PathBuf};
 
+use filetime::FileTime;
 use flagset::{flags, FlagSet};
 
 #[derive(Debug, Eq, PartialEq, Copy, Clone)]
@@ -18,6 +19,7 @@ flags! {
         Local,
         Weak,
         Common,
+        Hidden,
     }
 }
 #[derive(Debug, Copy, Clone, Default)]
@@ -37,7 +39,8 @@ pub struct ObjSection {
     pub data_diff: Vec<ObjDataDiff>,
     pub match_percent: f32,
 }
-#[derive(Debug, Clone)]
+
+#[derive(Debug, Clone, Eq, PartialEq)]
 pub enum ObjInsArg {
     PpcArg(ppc750cl::Argument),
     MipsArg(String),
@@ -46,6 +49,7 @@ pub enum ObjInsArg {
     RelocWithBase,
     BranchOffset(i32),
 }
+
 #[derive(Debug, Copy, Clone)]
 pub struct ObjInsArgDiff {
     /// Incrementing index for coloring
@@ -86,6 +90,8 @@ pub struct ObjIns {
     pub branch_dest: Option<u32>,
     /// Line info
     pub line: Option<u32>,
+    /// Original (unsimplified) instruction
+    pub orig: Option<String>,
 }
 #[derive(Debug, Clone, Default)]
 pub struct ObjInsDiff {
@@ -139,6 +145,7 @@ pub enum ObjArchitecture {
 pub struct ObjInfo {
     pub architecture: ObjArchitecture,
     pub path: PathBuf,
+    pub timestamp: FileTime,
     pub sections: Vec<ObjSection>,
     pub common: Vec<ObjSymbol>,
     pub line_info: Option<BTreeMap<u32, u32>>,

src/obj/ppc.rs

@@ -1,7 +1,7 @@
 use std::collections::BTreeMap;
 
 use anyhow::Result;
-use ppc750cl::{disasm_iter, Argument};
+use ppc750cl::{disasm_iter, Argument, SimplifiedIns};
 
 use crate::obj::{ObjIns, ObjInsArg, ObjReloc, ObjRelocKind};
 
@@ -40,7 +40,7 @@ pub fn process_code(
                 _ => ins.code,
             };
         }
-        let simplified = ins.simplified();
+        let simplified = ins.clone().simplified();
         let mut args: Vec<ObjInsArg> = simplified
             .args
             .iter()
@@ -86,9 +86,10 @@ pub fn process_code(
             mnemonic: format!("{}{}", simplified.mnemonic, simplified.suffix),
             args,
             reloc: reloc.cloned(),
-            op: 0,
+            op: ins.op as u8,
             branch_dest: None,
             line,
+            orig: Some(format!("{}", SimplifiedIns::basic_form(ins))),
         });
     }
     Ok((ops, insts))

src/views/appearance.rs

@@ -7,7 +7,6 @@ pub struct Appearance {
     pub ui_font: FontId,
     pub code_font: FontId,
     pub diff_colors: Vec<Color32>,
-    pub reverse_fn_order: bool,
     pub theme: eframe::Theme,
 
     // Applied by theme
@@ -37,7 +36,6 @@ impl Default for Appearance {
             ui_font: FontId { size: 12.0, family: FontFamily::Proportional },
             code_font: FontId { size: 14.0, family: FontFamily::Monospace },
             diff_colors: DEFAULT_COLOR_ROTATION.to_vec(),
-            reverse_fn_order: false,
             theme: eframe::Theme::Dark,
             text_color: Color32::GRAY,
             emphasized_text_color: Color32::LIGHT_GRAY,

src/views/config.rs

@@ -2,8 +2,8 @@
 use std::string::FromUtf16Error;
 use std::{
     borrow::Cow,
+    mem::take,
     path::{PathBuf, MAIN_SEPARATOR},
-    sync::{Arc, RwLock},
 };
 
 #[cfg(windows)]
@@ -17,9 +17,13 @@ use globset::Glob;
 use self_update::cargo_crate_version;
 
 use crate::{
-    app::AppConfig,
-    config::{ProjectUnit, ProjectUnitNode},
-    jobs::{check_update::CheckUpdateResult, objdiff::start_build, update::start_update, JobQueue},
+    app::{AppConfig, AppConfigRef, ObjectConfig},
+    config::{ProjectObject, ProjectObjectNode},
+    jobs::{
+        check_update::{start_check_update, CheckUpdateResult},
+        update::start_update,
+        Job, JobQueue, JobResult,
+    },
     update::RELEASE_URL,
     views::appearance::Appearance,
 };
@@ -27,15 +31,56 @@ use crate::{
 #[derive(Default)]
 pub struct ConfigViewState {
     pub check_update: Option<Box<CheckUpdateResult>>,
+    pub check_update_running: bool,
+    pub queue_check_update: bool,
+    pub update_running: bool,
+    pub queue_update: bool,
+    pub build_running: bool,
+    pub queue_build: bool,
     pub watch_pattern_text: String,
-    pub queue_update_check: bool,
     pub load_error: Option<String>,
-    pub unit_search: String,
+    pub object_search: String,
+    pub filter_diffable: bool,
     #[cfg(windows)]
     pub available_wsl_distros: Option<Vec<String>>,
 }
 
-const DEFAULT_WATCH_PATTERNS: &[&str] = &[
+impl ConfigViewState {
+    pub fn pre_update(&mut self, jobs: &mut JobQueue) {
+        jobs.results.retain_mut(|result| {
+            if let JobResult::CheckUpdate(result) = result {
+                self.check_update = take(result);
+                false
+            } else {
+                true
+            }
+        });
+        self.build_running = jobs.is_running(Job::ObjDiff);
+        self.check_update_running = jobs.is_running(Job::CheckUpdate);
+        self.update_running = jobs.is_running(Job::Update);
+    }
+
+    pub fn post_update(&mut self, jobs: &mut JobQueue, config: &AppConfigRef) {
+        if self.queue_build {
+            self.queue_build = false;
+            if let Ok(mut config) = config.write() {
+                config.queue_build = true;
+            }
+        }
+
+        if self.queue_check_update {
+            self.queue_check_update = false;
+            jobs.push_once(Job::CheckUpdate, start_check_update);
+        }
+
+        if self.queue_update {
+            self.queue_update = false;
+            jobs.push_once(Job::Update, start_update);
+        }
+    }
+}
+
+pub const DEFAULT_WATCH_PATTERNS: &[&str] = &[
     "*.c", "*.cp", "*.cpp", "*.cxx", "*.h", "*.hp", "*.hpp", "*.hxx", "*.s", "*.S", "*.asm",
     "*.inc", "*.py", "*.yml", "*.txt", "*.json",
 ];
@@ -75,8 +120,7 @@ fn fetch_wsl2_distros() -> Vec<String> {
 
 pub fn config_ui(
     ui: &mut egui::Ui,
-    config: &Arc<RwLock<AppConfig>>,
-    jobs: &mut JobQueue,
+    config: &AppConfigRef,
     show_config_window: &mut bool,
     state: &mut ConfigViewState,
     appearance: &Appearance,
@@ -86,17 +130,17 @@ pub fn config_ui(
         selected_wsl_distro,
         target_obj_dir,
         base_obj_dir,
-        obj_path,
+        selected_obj,
         auto_update_check,
-        units,
-        unit_nodes,
+        objects,
+        object_nodes,
         ..
     } = &mut *config_guard;
 
     ui.heading("Updates");
     ui.checkbox(auto_update_check, "Check for updates on startup");
-    if ui.button("Check now").clicked() {
-        state.queue_update_check = true;
+    if ui.add_enabled(!state.check_update_running, egui::Button::new("Check now")).clicked() {
+        state.queue_check_update = true;
     }
     ui.label(format!("Current version: {}", cargo_crate_version!())).on_hover_ui_at_pointer(|ui| {
         ui.label(formatcp!("Git branch: {}", env!("VERGEN_GIT_BRANCH")));
@@ -104,20 +148,20 @@ pub fn config_ui(
         ui.label(formatcp!("Build target: {}", env!("VERGEN_CARGO_TARGET_TRIPLE")));
         ui.label(formatcp!("Debug: {}", env!("VERGEN_CARGO_DEBUG")));
     });
-    if let Some(state) = &state.check_update {
-        ui.label(format!("Latest version: {}", state.latest_release.version));
-        if state.update_available {
+    if let Some(result) = &state.check_update {
+        ui.label(format!("Latest version: {}", result.latest_release.version));
+        if result.update_available {
             ui.colored_label(appearance.insert_color, "Update available");
             ui.horizontal(|ui| {
-                if state.found_binary
+                if result.found_binary
                     && ui
-                        .button("Automatic")
+                        .add_enabled(!state.update_running, egui::Button::new("Automatic"))
                         .on_hover_text_at_pointer(
                             "Automatically download and replace the current build",
                         )
                         .clicked()
                 {
-                    jobs.push(start_update());
+                    state.queue_update = true;
                 }
                 if ui
                     .button("Manual")
@@ -162,9 +206,9 @@ pub fn config_ui(
         }
     });
 
-    if let (Some(base_dir), Some(target_dir)) = (base_obj_dir, target_obj_dir) {
-        let mut new_build_obj = obj_path.clone();
-        if units.is_empty() {
+    let mut new_selected_obj = selected_obj.clone();
+    if objects.is_empty() {
+        if let (Some(base_dir), Some(target_dir)) = (base_obj_dir, target_obj_dir) {
             if ui.button("Select object").clicked() {
                 if let Some(path) = rfd::FileDialog::new()
                     .set_directory(&target_dir)
@@ -172,116 +216,157 @@ pub fn config_ui(
                     .pick_file()
                 {
                     if let Ok(obj_path) = path.strip_prefix(&base_dir) {
-                        new_build_obj = Some(obj_path.display().to_string());
+                        let target_path = target_dir.join(obj_path);
+                        new_selected_obj = Some(ObjectConfig {
+                            name: obj_path.display().to_string(),
+                            target_path: Some(target_path),
+                            base_path: Some(path),
+                            reverse_fn_order: None,
+                            complete: None,
+                        });
                     } else if let Ok(obj_path) = path.strip_prefix(&target_dir) {
-                        new_build_obj = Some(obj_path.display().to_string());
+                        let base_path = base_dir.join(obj_path);
+                        new_selected_obj = Some(ObjectConfig {
+                            name: obj_path.display().to_string(),
+                            target_path: Some(path),
+                            base_path: Some(base_path),
+                            reverse_fn_order: None,
+                            complete: None,
+                        });
                     }
                 }
             }
-            if let Some(obj) = obj_path {
+            if let Some(obj) = selected_obj {
                 ui.label(
-                    RichText::new(&*obj)
+                    RichText::new(&obj.name)
                         .color(appearance.replace_color)
                         .family(FontFamily::Monospace),
                 );
             }
         } else {
-            let had_search = !state.unit_search.is_empty();
-            egui::TextEdit::singleline(&mut state.unit_search).hint_text("Filter").ui(ui);
+            ui.colored_label(appearance.delete_color, "Missing project settings");
+        }
+    } else {
+        let had_search = !state.object_search.is_empty();
+        egui::TextEdit::singleline(&mut state.object_search).hint_text("Filter").ui(ui);
 
-            let mut root_open = None;
-            let mut node_open = NodeOpen::Default;
-            ui.horizontal(|ui| {
-                if ui.small_button("⏶").on_hover_text_at_pointer("Collapse all").clicked() {
-                    root_open = Some(false);
-                    node_open = NodeOpen::Close;
-                }
-                if ui.small_button("⏷").on_hover_text_at_pointer("Expand all").clicked() {
-                    root_open = Some(true);
-                    node_open = NodeOpen::Open;
-                }
-                if ui
-                    .add_enabled(obj_path.is_some(), egui::Button::new("⌖").small())
-                    .on_hover_text_at_pointer("Current object")
-                    .clicked()
-                {
-                    root_open = Some(true);
-                    node_open = NodeOpen::Object;
-                }
-            });
-            if state.unit_search.is_empty() {
-                if had_search {
-                    root_open = Some(true);
-                    node_open = NodeOpen::Object;
-                }
-            } else if !had_search {
+        let mut root_open = None;
+        let mut node_open = NodeOpen::Default;
+        ui.horizontal(|ui| {
+            if ui.small_button("⏶").on_hover_text_at_pointer("Collapse all").clicked() {
+                root_open = Some(false);
+                node_open = NodeOpen::Close;
+            }
+            if ui.small_button("⏷").on_hover_text_at_pointer("Expand all").clicked() {
                 root_open = Some(true);
                 node_open = NodeOpen::Open;
             }
-
-            CollapsingHeader::new(RichText::new("🗀 Objects").font(FontId {
-                size: appearance.ui_font.size,
-                family: appearance.code_font.family.clone(),
-            }))
-            .open(root_open)
-            .default_open(true)
-            .show(ui, |ui| {
-                let mut nodes = Cow::Borrowed(unit_nodes);
-                if !state.unit_search.is_empty() {
-                    let search = state.unit_search.to_ascii_lowercase();
-                    nodes = Cow::Owned(
-                        unit_nodes.iter().filter_map(|node| filter_node(node, &search)).collect(),
-                    );
-                }
-
-                ui.style_mut().wrap = Some(false);
-                for node in nodes.iter() {
-                    display_node(ui, &mut new_build_obj, node, appearance, node_open);
-                }
-            });
-        }
-
-        if new_build_obj != *obj_path {
-            if let Some(obj) = new_build_obj {
-                // Will set obj_changed, which will trigger a rebuild
-                config_guard.set_obj_path(obj);
-                // TODO apply reverse_fn_order
+            if ui
+                .add_enabled(selected_obj.is_some(), egui::Button::new("⌖").small())
+                .on_hover_text_at_pointer("Current object")
+                .clicked()
+            {
+                root_open = Some(true);
+                node_open = NodeOpen::Object;
             }
+            if ui
+                .selectable_label(state.filter_diffable, "Diffable")
+                .on_hover_text_at_pointer("Only show objects with a source file")
+                .clicked()
+            {
+                state.filter_diffable = !state.filter_diffable;
+            }
+        });
+        if state.object_search.is_empty() {
+            if had_search {
+                root_open = Some(true);
+                node_open = NodeOpen::Object;
+            }
+        } else if !had_search {
+            root_open = Some(true);
+            node_open = NodeOpen::Open;
         }
-        if config_guard.obj_path.is_some() && ui.button("Build").clicked() {
-            // Rebuild immediately
-            jobs.push(start_build(config.clone()));
+
+        CollapsingHeader::new(RichText::new("🗀 Objects").font(FontId {
+            size: appearance.ui_font.size,
+            family: appearance.code_font.family.clone(),
+        }))
+        .open(root_open)
+        .default_open(true)
+        .show(ui, |ui| {
+            let mut nodes = Cow::Borrowed(object_nodes);
+            if !state.object_search.is_empty() || state.filter_diffable {
+                let search = state.object_search.to_ascii_lowercase();
+                nodes = Cow::Owned(
+                    object_nodes
+                        .iter()
+                        .filter_map(|node| filter_node(node, &search, state.filter_diffable))
+                        .collect(),
+                );
+            }
+
+            ui.style_mut().wrap = Some(false);
+            for node in nodes.iter() {
+                display_node(ui, &mut new_selected_obj, node, appearance, node_open);
+            }
+        });
+    }
+    if new_selected_obj != *selected_obj {
+        if let Some(obj) = new_selected_obj {
+            // Will set obj_changed, which will trigger a rebuild
+            config_guard.set_selected_obj(obj);
         }
-    } else {
-        ui.colored_label(appearance.delete_color, "Missing project settings");
+    }
+    if config_guard.selected_obj.is_some()
+        && ui.add_enabled(!state.build_running, egui::Button::new("Build")).clicked()
+    {
+        state.queue_build = true;
     }
 
-    // ui.checkbox(&mut view_config.reverse_fn_order, "Reverse function order (deferred)");
     ui.separator();
 }
 
-fn display_unit(
+fn display_object(
     ui: &mut egui::Ui,
-    obj_path: &mut Option<String>,
+    selected_obj: &mut Option<ObjectConfig>,
     name: &str,
-    unit: &ProjectUnit,
+    object: &ProjectObject,
     appearance: &Appearance,
 ) {
-    let path_string = unit.path.to_string_lossy().to_string();
-    let selected = matches!(obj_path, Some(path) if path == &path_string);
-    if SelectableLabel::new(
+    let object_name = object.name();
+    let selected = matches!(selected_obj, Some(obj) if obj.name == object_name);
+    let color = if selected {
+        appearance.emphasized_text_color
+    } else if let Some(complete) = object.complete {
+        if complete {
+            appearance.insert_color
+        } else {
+            appearance.delete_color
+        }
+    } else {
+        appearance.text_color
+    };
+    let clicked = SelectableLabel::new(
         selected,
         RichText::new(name)
             .font(FontId {
                 size: appearance.ui_font.size,
                 family: appearance.code_font.family.clone(),
             })
-            .color(appearance.text_color),
+            .color(color),
     )
     .ui(ui)
-    .clicked()
-    {
-        *obj_path = Some(path_string);
+    .clicked();
+    // Always recreate ObjectConfig if selected, in case the project config changed.
+    // ObjectConfig is compared using equality, so this won't unnecessarily trigger a rebuild.
+    if selected || clicked {
+        *selected_obj = Some(ObjectConfig {
+            name: object_name.to_string(),
+            target_path: object.target_path.clone(),
+            base_path: object.base_path.clone(),
+            reverse_fn_order: object.reverse_fn_order,
+            complete: object.complete,
+        });
     }
 }
 
@@ -296,17 +381,17 @@ enum NodeOpen {
 
 fn display_node(
     ui: &mut egui::Ui,
-    obj_path: &mut Option<String>,
-    node: &ProjectUnitNode,
+    selected_obj: &mut Option<ObjectConfig>,
+    node: &ProjectObjectNode,
     appearance: &Appearance,
     node_open: NodeOpen,
 ) {
     match node {
-        ProjectUnitNode::File(name, unit) => {
-            display_unit(ui, obj_path, name, unit, appearance);
+        ProjectObjectNode::File(name, object) => {
+            display_object(ui, selected_obj, name, object, appearance);
         }
-        ProjectUnitNode::Dir(name, children) => {
-            let contains_obj = obj_path.as_ref().map(|path| contains_node(node, path));
+        ProjectObjectNode::Dir(name, children) => {
+            let contains_obj = selected_obj.as_ref().map(|path| contains_node(node, path));
             let open = match node_open {
                 NodeOpen::Default => None,
                 NodeOpen::Open => Some(true),
@@ -329,40 +414,48 @@ fn display_node(
             .open(open)
             .show(ui, |ui| {
                 for node in children {
-                    display_node(ui, obj_path, node, appearance, node_open);
+                    display_node(ui, selected_obj, node, appearance, node_open);
                 }
             });
         }
     }
 }
 
-fn contains_node(node: &ProjectUnitNode, path: &str) -> bool {
+fn contains_node(node: &ProjectObjectNode, selected_obj: &ObjectConfig) -> bool {
     match node {
-        ProjectUnitNode::File(_, unit) => {
-            let path_string = unit.path.to_string_lossy().to_string();
-            path == path_string
+        ProjectObjectNode::File(_, object) => object.name() == selected_obj.name,
+        ProjectObjectNode::Dir(_, children) => {
+            children.iter().any(|node| contains_node(node, selected_obj))
         }
-        ProjectUnitNode::Dir(_, children) => children.iter().any(|node| contains_node(node, path)),
     }
 }
 
-fn filter_node(node: &ProjectUnitNode, search: &str) -> Option<ProjectUnitNode> {
+fn filter_node(
+    node: &ProjectObjectNode,
+    search: &str,
+    filter_diffable: bool,
+) -> Option<ProjectObjectNode> {
     match node {
-        ProjectUnitNode::File(name, _) => {
-            if name.to_ascii_lowercase().contains(search) {
+        ProjectObjectNode::File(name, object) => {
+            if (search.is_empty() || name.to_ascii_lowercase().contains(search))
+                && (!filter_diffable || object.base_path.is_some())
+            {
                 Some(node.clone())
             } else {
                 None
             }
         }
-        ProjectUnitNode::Dir(name, children) => {
-            if name.to_ascii_lowercase().contains(search) {
+        ProjectObjectNode::Dir(name, children) => {
+            if (search.is_empty() || name.to_ascii_lowercase().contains(search)) && !filter_diffable
+            {
                 return Some(node.clone());
             }
-            let new_children =
-                children.iter().filter_map(|child| filter_node(child, search)).collect::<Vec<_>>();
+            let new_children = children
+                .iter()
+                .filter_map(|child| filter_node(child, search, filter_diffable))
+                .collect::<Vec<_>>();
             if !new_children.is_empty() {
-                Some(ProjectUnitNode::Dir(name.clone(), new_children))
+                Some(ProjectObjectNode::Dir(name.clone(), new_children))
             } else {
                 None
             }
@@ -399,11 +492,12 @@ fn pick_folder_ui(
     label: &str,
     tooltip: impl FnOnce(&mut egui::Ui),
     appearance: &Appearance,
+    enabled: bool,
 ) -> egui::Response {
     let response = ui.horizontal(|ui| {
         subheading(ui, label, appearance);
         ui.link(HELP_ICON).on_hover_ui(tooltip);
-        ui.button("Select")
+        ui.add_enabled(enabled, egui::Button::new("Select"))
     });
     ui.label(format_path(dir, appearance));
     response.inner
@@ -411,7 +505,7 @@ fn pick_folder_ui(
 
 pub fn project_window(
     ctx: &egui::Context,
-    config: &Arc<RwLock<AppConfig>>,
+    config: &AppConfigRef,
     show: &mut bool,
     state: &mut ConfigViewState,
     appearance: &Appearance,
@@ -461,6 +555,7 @@ fn split_obj_config_ui(
             ui.label(job);
         },
         appearance,
+        true,
     );
     if response.clicked() {
         if let Some(path) = rfd::FileDialog::new().pick_folder() {
@@ -521,6 +616,7 @@ fn split_obj_config_ui(
                 ui.label(job);
             },
             appearance,
+            config.project_config_info.is_none(),
         );
         if response.clicked() {
             if let Some(path) = rfd::FileDialog::new().set_directory(&project_dir).pick_folder() {
@@ -570,18 +666,42 @@ fn split_obj_config_ui(
                 ui.label(job);
             },
             appearance,
+            config.project_config_info.is_none(),
         );
         if response.clicked() {
             if let Some(path) = rfd::FileDialog::new().set_directory(&project_dir).pick_folder() {
                 config.set_base_obj_dir(path);
             }
         }
+        ui.checkbox(&mut config.build_base, "Build base objects").on_hover_ui(|ui| {
+            let mut job = LayoutJob::default();
+            job.append(
+                "Tells the build system to produce the base object.\n",
+                0.0,
+                text_format.clone(),
+            );
+            job.append("For example, this would call ", 0.0, text_format.clone());
+            job.append("make path/to/base.o", 0.0, code_format.clone());
+            job.append(".\n\n", 0.0, text_format.clone());
+            job.append(
+                "This can be disabled if you're running the build system\n",
+                0.0,
+                text_format.clone(),
+            );
+            job.append(
+                "externally, and just want objdiff to reload the files\n",
+                0.0,
+                text_format.clone(),
+            );
+            job.append("when they change.", 0.0, text_format.clone());
+            ui.label(job);
+        });
         ui.separator();
     }
 
     subheading(ui, "Watch settings", appearance);
     let response =
-        ui.checkbox(&mut config.watcher_enabled, "Rebuild on changes").on_hover_ui(|ui| {
+        ui.checkbox(&mut config.rebuild_on_changes, "Rebuild on changes").on_hover_ui(|ui| {
             let mut job = LayoutJob::default();
             job.append(
                 "Automatically re-run the build & diff when files change.",

src/views/data_diff.rs

@@ -5,7 +5,6 @@ use egui_extras::{Column, TableBuilder};
 use time::format_description;
 
 use crate::{
-    jobs::{Job, JobQueue},
     obj::{ObjDataDiff, ObjDataDiffKind, ObjInfo, ObjSection},
     views::{
         appearance::Appearance,
@@ -133,46 +132,49 @@ fn split_diffs(diffs: &[ObjDataDiff]) -> Vec<Vec<ObjDataDiff>> {
 
 fn data_table_ui(
     table: TableBuilder<'_>,
-    left_obj: &ObjInfo,
-    right_obj: &ObjInfo,
+    left_obj: Option<&ObjInfo>,
+    right_obj: Option<&ObjInfo>,
     selected_symbol: &SymbolReference,
     config: &Appearance,
 ) -> Option<()> {
-    let left_section = find_section(left_obj, selected_symbol)?;
-    let right_section = find_section(right_obj, selected_symbol)?;
+    let left_section = left_obj.and_then(|obj| find_section(obj, selected_symbol));
+    let right_section = right_obj.and_then(|obj| find_section(obj, selected_symbol));
 
-    let total_bytes = left_section.data_diff.iter().fold(0usize, |accum, item| accum + item.len);
+    let total_bytes = left_section
+        .or(right_section)?
+        .data_diff
+        .iter()
+        .fold(0usize, |accum, item| accum + item.len);
     if total_bytes == 0 {
         return None;
     }
     let total_rows = (total_bytes - 1) / BYTES_PER_ROW + 1;
 
-    let left_diffs = split_diffs(&left_section.data_diff);
-    let right_diffs = split_diffs(&right_section.data_diff);
+    let left_diffs = left_section.map(|section| split_diffs(&section.data_diff));
+    let right_diffs = right_section.map(|section| split_diffs(&section.data_diff));
 
     table.body(|body| {
         body.rows(config.code_font.size, total_rows, |row_index, mut row| {
             let address = row_index * BYTES_PER_ROW;
             row.col(|ui| {
-                data_row_ui(ui, address, &left_diffs[row_index], config);
+                if let Some(left_diffs) = &left_diffs {
+                    data_row_ui(ui, address, &left_diffs[row_index], config);
+                }
             });
             row.col(|ui| {
-                data_row_ui(ui, address, &right_diffs[row_index], config);
+                if let Some(right_diffs) = &right_diffs {
+                    data_row_ui(ui, address, &right_diffs[row_index], config);
+                }
             });
         });
     });
     Some(())
 }
 
-pub fn data_diff_ui(
-    ui: &mut egui::Ui,
-    jobs: &JobQueue,
-    state: &mut DiffViewState,
-    appearance: &Appearance,
-) -> bool {
-    let mut rebuild = false;
-    let (Some(result), Some(selected_symbol)) = (&state.build, &state.selected_symbol) else {
-        return rebuild;
+pub fn data_diff_ui(ui: &mut egui::Ui, state: &mut DiffViewState, appearance: &Appearance) {
+    let (Some(result), Some(selected_symbol)) = (&state.build, &state.symbol_state.selected_symbol)
+    else {
+        return;
     };
 
     // Header
@@ -210,13 +212,16 @@ pub fn data_diff_ui(
                     ui.set_width(column_width);
 
                     ui.horizontal(|ui| {
-                        if ui.button("Build").clicked() {
-                            rebuild = true;
+                        if ui
+                            .add_enabled(!state.build_running, egui::Button::new("Build"))
+                            .clicked()
+                        {
+                            state.queue_build = true;
                         }
                         ui.scope(|ui| {
                             ui.style_mut().override_text_style = Some(egui::TextStyle::Monospace);
                             ui.style_mut().wrap = Some(false);
-                            if jobs.is_running(Job::ObjDiff) {
+                            if state.build_running {
                                 ui.colored_label(appearance.replace_color, "Building…");
                             } else {
                                 ui.label("Last built:");
@@ -246,17 +251,19 @@ pub fn data_diff_ui(
     ui.separator();
 
     // Table
-    if let (Some(left_obj), Some(right_obj)) = (&result.first_obj, &result.second_obj) {
-        let available_height = ui.available_height();
-        let table = TableBuilder::new(ui)
-            .striped(false)
-            .cell_layout(Layout::left_to_right(Align::Min))
-            .columns(Column::exact(column_width).clip(true), 2)
-            .resizable(false)
-            .auto_shrink([false, false])
-            .min_scrolled_height(available_height);
-        data_table_ui(table, left_obj, right_obj, selected_symbol, appearance);
-    }
-
-    rebuild
+    let available_height = ui.available_height();
+    let table = TableBuilder::new(ui)
+        .striped(false)
+        .cell_layout(Layout::left_to_right(Align::Min))
+        .columns(Column::exact(column_width).clip(true), 2)
+        .resizable(false)
+        .auto_shrink([false, false])
+        .min_scrolled_height(available_height);
+    data_table_ui(
+        table,
+        result.first_obj.as_ref(),
+        result.second_obj.as_ref(),
+        selected_symbol,
+        appearance,
+    );
 }

src/views/function_diff.rs

@@ -1,14 +1,16 @@
-use std::{cmp::Ordering, default::Default};
+use std::{
+    cmp::{max, Ordering},
+    default::Default,
+};
 
 use cwdemangle::demangle;
 use eframe::emath::Align;
-use egui::{text::LayoutJob, Color32, FontId, Label, Layout, Sense, Vec2};
-use egui_extras::{Column, TableBuilder};
+use egui::{text::LayoutJob, Color32, Label, Layout, RichText, Sense, TextFormat, Vec2};
+use egui_extras::{Column, TableBuilder, TableRow};
 use ppc750cl::Argument;
 use time::format_description;
 
 use crate::{
-    jobs::{Job, JobQueue},
     obj::{
         ObjInfo, ObjIns, ObjInsArg, ObjInsArgDiff, ObjInsDiff, ObjInsDiffKind, ObjReloc,
         ObjRelocKind, ObjSymbol,
@@ -20,21 +22,49 @@ use crate::{
     },
 };
 
+#[derive(Default)]
+pub enum HighlightKind {
+    #[default]
+    None,
+    Opcode(u8),
+    Arg(ObjInsArg),
+    Symbol(String),
+    Address(u32),
+}
+
+#[derive(Default)]
+pub struct FunctionViewState {
+    pub highlight: HighlightKind,
+}
+
 fn write_reloc_name(
     reloc: &ObjReloc,
     color: Color32,
+    background_color: Color32,
     job: &mut LayoutJob,
-    font_id: FontId,
     appearance: &Appearance,
 ) {
     let name = reloc.target.demangled_name.as_ref().unwrap_or(&reloc.target.name);
-    write_text(name, appearance.emphasized_text_color, job, font_id.clone());
+    job.append(name, 0.0, TextFormat {
+        font_id: appearance.code_font.clone(),
+        color: appearance.emphasized_text_color,
+        background: background_color,
+        ..Default::default()
+    });
     match reloc.target.addend.cmp(&0i64) {
-        Ordering::Greater => {
-            write_text(&format!("+{:#X}", reloc.target.addend), color, job, font_id)
-        }
+        Ordering::Greater => write_text(
+            &format!("+{:#X}", reloc.target.addend),
+            color,
+            job,
+            appearance.code_font.clone(),
+        ),
         Ordering::Less => {
-            write_text(&format!("-{:#X}", -reloc.target.addend), color, job, font_id);
+            write_text(
+                &format!("-{:#X}", -reloc.target.addend),
+                color,
+                job,
+                appearance.code_font.clone(),
+            );
         }
         _ => {}
     }
@@ -43,57 +73,57 @@ fn write_reloc_name(
 fn write_reloc(
     reloc: &ObjReloc,
     color: Color32,
+    background_color: Color32,
     job: &mut LayoutJob,
-    font_id: FontId,
     appearance: &Appearance,
 ) {
     match reloc.kind {
         ObjRelocKind::PpcAddr16Lo => {
-            write_reloc_name(reloc, color, job, font_id.clone(), appearance);
-            write_text("@l", color, job, font_id);
+            write_reloc_name(reloc, color, background_color, job, appearance);
+            write_text("@l", color, job, appearance.code_font.clone());
         }
         ObjRelocKind::PpcAddr16Hi => {
-            write_reloc_name(reloc, color, job, font_id.clone(), appearance);
-            write_text("@h", color, job, font_id);
+            write_reloc_name(reloc, color, background_color, job, appearance);
+            write_text("@h", color, job, appearance.code_font.clone());
         }
         ObjRelocKind::PpcAddr16Ha => {
-            write_reloc_name(reloc, color, job, font_id.clone(), appearance);
-            write_text("@ha", color, job, font_id);
+            write_reloc_name(reloc, color, background_color, job, appearance);
+            write_text("@ha", color, job, appearance.code_font.clone());
         }
         ObjRelocKind::PpcEmbSda21 => {
-            write_reloc_name(reloc, color, job, font_id.clone(), appearance);
-            write_text("@sda21", color, job, font_id);
+            write_reloc_name(reloc, color, background_color, job, appearance);
+            write_text("@sda21", color, job, appearance.code_font.clone());
         }
         ObjRelocKind::MipsHi16 => {
-            write_text("%hi(", color, job, font_id.clone());
-            write_reloc_name(reloc, color, job, font_id.clone(), appearance);
-            write_text(")", color, job, font_id);
+            write_text("%hi(", color, job, appearance.code_font.clone());
+            write_reloc_name(reloc, color, background_color, job, appearance);
+            write_text(")", color, job, appearance.code_font.clone());
         }
         ObjRelocKind::MipsLo16 => {
-            write_text("%lo(", color, job, font_id.clone());
-            write_reloc_name(reloc, color, job, font_id.clone(), appearance);
-            write_text(")", color, job, font_id);
+            write_text("%lo(", color, job, appearance.code_font.clone());
+            write_reloc_name(reloc, color, background_color, job, appearance);
+            write_text(")", color, job, appearance.code_font.clone());
         }
         ObjRelocKind::MipsGot16 => {
-            write_text("%got(", color, job, font_id.clone());
-            write_reloc_name(reloc, color, job, font_id.clone(), appearance);
-            write_text(")", color, job, font_id);
+            write_text("%got(", color, job, appearance.code_font.clone());
+            write_reloc_name(reloc, color, background_color, job, appearance);
+            write_text(")", color, job, appearance.code_font.clone());
         }
         ObjRelocKind::MipsCall16 => {
-            write_text("%call16(", color, job, font_id.clone());
-            write_reloc_name(reloc, color, job, font_id.clone(), appearance);
-            write_text(")", color, job, font_id);
+            write_text("%call16(", color, job, appearance.code_font.clone());
+            write_reloc_name(reloc, color, background_color, job, appearance);
+            write_text(")", color, job, appearance.code_font.clone());
         }
         ObjRelocKind::MipsGpRel16 => {
-            write_text("%gp_rel(", color, job, font_id.clone());
-            write_reloc_name(reloc, color, job, font_id.clone(), appearance);
-            write_text(")", color, job, font_id);
+            write_text("%gp_rel(", color, job, appearance.code_font.clone());
+            write_reloc_name(reloc, color, background_color, job, appearance);
+            write_text(")", color, job, appearance.code_font.clone());
         }
         ObjRelocKind::PpcRel24 | ObjRelocKind::PpcRel14 | ObjRelocKind::Mips26 => {
-            write_reloc_name(reloc, color, job, font_id, appearance);
+            write_reloc_name(reloc, color, background_color, job, appearance);
         }
         ObjRelocKind::Absolute | ObjRelocKind::MipsGpRel32 => {
-            write_text("[INVALID]", color, job, font_id);
+            write_text("[INVALID]", color, job, appearance.code_font.clone());
         }
     };
 }
@@ -103,8 +133,9 @@ fn write_ins(
     diff_kind: &ObjInsDiffKind,
     args: &[Option<ObjInsArgDiff>],
     base_addr: u32,
-    job: &mut LayoutJob,
+    ui: &mut egui::Ui,
     appearance: &Appearance,
+    ins_view_state: &mut FunctionViewState,
 ) {
     let base_color = match diff_kind {
         ObjInsDiffKind::None | ObjInsDiffKind::OpMismatch | ObjInsDiffKind::ArgMismatch => {
@@ -114,49 +145,96 @@ fn write_ins(
         ObjInsDiffKind::Delete => appearance.delete_color,
         ObjInsDiffKind::Insert => appearance.insert_color,
     };
-    write_text(
-        &format!("{:<11}", ins.mnemonic),
-        match diff_kind {
-            ObjInsDiffKind::OpMismatch => appearance.replace_color,
-            _ => base_color,
-        },
-        job,
-        appearance.code_font.clone(),
-    );
+
+    let highlighted_op =
+        matches!(ins_view_state.highlight, HighlightKind::Opcode(op) if op == ins.op);
+    let op_label = RichText::new(ins.mnemonic.clone())
+        .font(appearance.code_font.clone())
+        .color(if highlighted_op {
+            appearance.emphasized_text_color
+        } else {
+            match diff_kind {
+                ObjInsDiffKind::OpMismatch => appearance.replace_color,
+                _ => base_color,
+            }
+        })
+        .background_color(if highlighted_op {
+            appearance.deemphasized_text_color
+        } else {
+            Color32::TRANSPARENT
+        });
+    if ui
+        .add(Label::new(op_label).sense(Sense::click()))
+        .context_menu(|ui| ins_context_menu(ui, ins))
+        .clicked()
+    {
+        if highlighted_op {
+            ins_view_state.highlight = HighlightKind::None;
+        } else {
+            ins_view_state.highlight = HighlightKind::Opcode(ins.op);
+        }
+    }
+    let space_width = ui.fonts(|f| f.glyph_width(&appearance.code_font, ' '));
+    ui.add_space(space_width * (max(11, ins.mnemonic.len()) - ins.mnemonic.len()) as f32);
+
     let mut writing_offset = false;
     for (i, arg) in ins.args.iter().enumerate() {
+        let mut job = LayoutJob::default();
         if i == 0 {
-            write_text(" ", base_color, job, appearance.code_font.clone());
+            write_text(" ", base_color, &mut job, appearance.code_font.clone());
         }
         if i > 0 && !writing_offset {
-            write_text(", ", base_color, job, appearance.code_font.clone());
+            write_text(", ", base_color, &mut job, appearance.code_font.clone());
         }
-        let color = if let Some(diff) = args.get(i).and_then(|a| a.as_ref()) {
+        let highlighted_arg = match &ins_view_state.highlight {
+            HighlightKind::Symbol(v) => {
+                matches!(arg, ObjInsArg::Reloc | ObjInsArg::RelocWithBase)
+                    && matches!(&ins.reloc, Some(reloc) if &reloc.target.name == v)
+            }
+            HighlightKind::Address(v) => {
+                matches!(arg, ObjInsArg::BranchOffset(offset) if (offset + ins.address as i32 - base_addr as i32) as u32 == *v)
+            }
+            HighlightKind::Arg(v) => v == arg,
+            _ => false,
+        };
+        let color = if highlighted_arg {
+            appearance.emphasized_text_color
+        } else if let Some(diff) = args.get(i).and_then(|a| a.as_ref()) {
             appearance.diff_colors[diff.idx % appearance.diff_colors.len()]
         } else {
             base_color
         };
+        let text_format = TextFormat {
+            font_id: appearance.code_font.clone(),
+            color,
+            background: if highlighted_arg {
+                appearance.deemphasized_text_color
+            } else {
+                Color32::TRANSPARENT
+            },
+            ..Default::default()
+        };
+        let mut new_writing_offset = false;
         match arg {
             ObjInsArg::PpcArg(arg) => match arg {
                 Argument::Offset(val) => {
-                    write_text(&format!("{val}"), color, job, appearance.code_font.clone());
-                    write_text("(", base_color, job, appearance.code_font.clone());
-                    writing_offset = true;
-                    continue;
+                    job.append(&format!("{val}"), 0.0, text_format);
+                    write_text("(", base_color, &mut job, appearance.code_font.clone());
+                    new_writing_offset = true;
                 }
                 Argument::Uimm(_) | Argument::Simm(_) => {
-                    write_text(&format!("{arg}"), color, job, appearance.code_font.clone());
+                    job.append(&format!("{arg}"), 0.0, text_format);
                 }
                 _ => {
-                    write_text(&format!("{arg}"), color, job, appearance.code_font.clone());
+                    job.append(&format!("{arg}"), 0.0, text_format);
                 }
             },
             ObjInsArg::Reloc => {
                 write_reloc(
                     ins.reloc.as_ref().unwrap(),
                     base_color,
-                    job,
-                    appearance.code_font.clone(),
+                    text_format.background,
+                    &mut job,
                     appearance,
                 );
             }
@@ -164,41 +242,46 @@ fn write_ins(
                 write_reloc(
                     ins.reloc.as_ref().unwrap(),
                     base_color,
-                    job,
-                    appearance.code_font.clone(),
+                    text_format.background,
+                    &mut job,
                     appearance,
                 );
-                write_text("(", base_color, job, appearance.code_font.clone());
-                writing_offset = true;
-                continue;
+                write_text("(", base_color, &mut job, appearance.code_font.clone());
+                new_writing_offset = true;
             }
             ObjInsArg::MipsArg(str) => {
-                write_text(
-                    str.strip_prefix('$').unwrap_or(str),
-                    color,
-                    job,
-                    appearance.code_font.clone(),
-                );
+                job.append(str.strip_prefix('$').unwrap_or(str), 0.0, text_format);
             }
             ObjInsArg::MipsArgWithBase(str) => {
-                write_text(
-                    str.strip_prefix('$').unwrap_or(str),
-                    color,
-                    job,
-                    appearance.code_font.clone(),
-                );
-                write_text("(", base_color, job, appearance.code_font.clone());
-                writing_offset = true;
-                continue;
+                job.append(str.strip_prefix('$').unwrap_or(str), 0.0, text_format);
+                write_text("(", base_color, &mut job, appearance.code_font.clone());
+                new_writing_offset = true;
             }
             ObjInsArg::BranchOffset(offset) => {
                 let addr = offset + ins.address as i32 - base_addr as i32;
-                write_text(&format!("{addr:x}"), color, job, appearance.code_font.clone());
+                job.append(&format!("{addr:x}"), 0.0, text_format);
             }
         }
         if writing_offset {
-            write_text(")", base_color, job, appearance.code_font.clone());
-            writing_offset = false;
+            write_text(")", base_color, &mut job, appearance.code_font.clone());
+        }
+        writing_offset = new_writing_offset;
+        if ui
+            .add(Label::new(job).sense(Sense::click()))
+            .context_menu(|ui| ins_context_menu(ui, ins))
+            .clicked()
+        {
+            if highlighted_arg {
+                ins_view_state.highlight = HighlightKind::None;
+            } else if matches!(arg, ObjInsArg::Reloc | ObjInsArg::RelocWithBase) {
+                ins_view_state.highlight =
+                    HighlightKind::Symbol(ins.reloc.as_ref().unwrap().target.name.clone());
+            } else if let ObjInsArg::BranchOffset(offset) = arg {
+                ins_view_state.highlight =
+                    HighlightKind::Address((offset + ins.address as i32 - base_addr as i32) as u32);
+            } else {
+                ins_view_state.highlight = HighlightKind::Arg(arg.clone());
+            }
         }
     }
 }
@@ -210,6 +293,10 @@ fn ins_hover_ui(ui: &mut egui::Ui, ins: &ObjIns, appearance: &Appearance) {
 
         ui.label(format!("{:02X?}", ins.code.to_be_bytes()));
 
+        if let Some(orig) = &ins.orig {
+            ui.label(format!("Original: {}", orig));
+        }
+
         for arg in &ins.args {
             if let ObjInsArg::PpcArg(arg) = arg {
                 match arg {
@@ -317,7 +404,9 @@ fn asm_row_ui(
     ins_diff: &ObjInsDiff,
     symbol: &ObjSymbol,
     appearance: &Appearance,
+    ins_view_state: &mut FunctionViewState,
 ) {
+    ui.spacing_mut().item_spacing.x = 0.0;
     if ins_diff.kind != ObjInsDiffKind::None {
         ui.painter().rect_filled(ui.available_rect_before_wrap(), 0.0, ui.visuals().faint_bg_color);
     }
@@ -346,72 +435,141 @@ fn asm_row_ui(
         );
         pad = 12 - line_str.len();
     }
-    write_text(
-        &format!("{:<1$}", format!("{:x}: ", ins.address - symbol.address as u32), pad),
-        base_color,
-        &mut job,
-        appearance.code_font.clone(),
+    let base_addr = symbol.address as u32;
+    let addr_highlight = matches!(
+        &ins_view_state.highlight,
+        HighlightKind::Address(v) if *v == (ins.address - base_addr)
     );
-    if let Some(branch) = &ins_diff.branch_from {
-        write_text(
-            "~> ",
-            appearance.diff_colors[branch.branch_idx % appearance.diff_colors.len()],
-            &mut job,
-            appearance.code_font.clone(),
-        );
-    } else {
-        write_text("   ", base_color, &mut job, appearance.code_font.clone());
+    let addr_string = format!("{:x}", ins.address - symbol.address as u32);
+    pad -= addr_string.len();
+    job.append(&addr_string, 0.0, TextFormat {
+        font_id: appearance.code_font.clone(),
+        color: if addr_highlight { appearance.emphasized_text_color } else { base_color },
+        background: if addr_highlight {
+            appearance.deemphasized_text_color
+        } else {
+            Color32::TRANSPARENT
+        },
+        ..Default::default()
+    });
+    if ui
+        .add(Label::new(job).sense(Sense::click()))
+        .context_menu(|ui| ins_context_menu(ui, ins))
+        .clicked()
+    {
+        if addr_highlight {
+            ins_view_state.highlight = HighlightKind::None;
+        } else {
+            ins_view_state.highlight = HighlightKind::Address(ins.address - base_addr);
+        }
     }
-    write_ins(ins, &ins_diff.kind, &ins_diff.arg_diff, symbol.address as u32, &mut job, appearance);
+
+    let mut job = LayoutJob::default();
+    let space_width = ui.fonts(|f| f.glyph_width(&appearance.code_font, ' '));
+    let spacing = space_width * pad as f32;
+    job.append(": ", 0.0, TextFormat {
+        font_id: appearance.code_font.clone(),
+        color: base_color,
+        ..Default::default()
+    });
+    if let Some(branch) = &ins_diff.branch_from {
+        job.append("~> ", spacing, TextFormat {
+            font_id: appearance.code_font.clone(),
+            color: appearance.diff_colors[branch.branch_idx % appearance.diff_colors.len()],
+            ..Default::default()
+        });
+    } else {
+        job.append("   ", spacing, TextFormat {
+            font_id: appearance.code_font.clone(),
+            color: base_color,
+            ..Default::default()
+        });
+    }
+    ui.add(Label::new(job));
+    write_ins(ins, &ins_diff.kind, &ins_diff.arg_diff, base_addr, ui, appearance, ins_view_state);
     if let Some(branch) = &ins_diff.branch_to {
+        let mut job = LayoutJob::default();
         write_text(
             " ~>",
             appearance.diff_colors[branch.branch_idx % appearance.diff_colors.len()],
             &mut job,
             appearance.code_font.clone(),
         );
+        ui.add(Label::new(job));
     }
-    ui.add(Label::new(job).sense(Sense::click()))
-        .on_hover_ui_at_pointer(|ui| ins_hover_ui(ui, ins, appearance))
-        .context_menu(|ui| ins_context_menu(ui, ins));
+}
+
+fn asm_col_ui(
+    row: &mut TableRow<'_, '_>,
+    ins_diff: &ObjInsDiff,
+    symbol: &ObjSymbol,
+    appearance: &Appearance,
+    ins_view_state: &mut FunctionViewState,
+) {
+    let (_, response) = row.col(|ui| {
+        asm_row_ui(ui, ins_diff, symbol, appearance, ins_view_state);
+    });
+    if let Some(ins) = &ins_diff.ins {
+        response
+            .on_hover_ui_at_pointer(|ui| {
+                ins_hover_ui(ui, ins, appearance);
+            })
+            .context_menu(|ui| {
+                ins_context_menu(ui, ins);
+            });
+    }
+}
+
+fn empty_col_ui(row: &mut TableRow<'_, '_>) {
+    row.col(|ui| {
+        ui.label("");
+    });
 }
 
 fn asm_table_ui(
     table: TableBuilder<'_>,
-    left_obj: &ObjInfo,
-    right_obj: &ObjInfo,
+    left_obj: Option<&ObjInfo>,
+    right_obj: Option<&ObjInfo>,
     selected_symbol: &SymbolReference,
     appearance: &Appearance,
+    ins_view_state: &mut FunctionViewState,
 ) -> Option<()> {
-    let left_symbol = find_symbol(left_obj, selected_symbol);
-    let right_symbol = find_symbol(right_obj, selected_symbol);
+    let left_symbol = left_obj.and_then(|obj| find_symbol(obj, selected_symbol));
+    let right_symbol = right_obj.and_then(|obj| find_symbol(obj, selected_symbol));
     let instructions_len = left_symbol.or(right_symbol).map(|s| s.instructions.len())?;
     table.body(|body| {
         body.rows(appearance.code_font.size, instructions_len, |row_index, mut row| {
-            row.col(|ui| {
-                if let Some(symbol) = left_symbol {
-                    asm_row_ui(ui, &symbol.instructions[row_index], symbol, appearance);
-                }
-            });
-            row.col(|ui| {
-                if let Some(symbol) = right_symbol {
-                    asm_row_ui(ui, &symbol.instructions[row_index], symbol, appearance);
-                }
-            });
+            if let Some(symbol) = left_symbol {
+                asm_col_ui(
+                    &mut row,
+                    &symbol.instructions[row_index],
+                    symbol,
+                    appearance,
+                    ins_view_state,
+                );
+            } else {
+                empty_col_ui(&mut row);
+            }
+            if let Some(symbol) = right_symbol {
+                asm_col_ui(
+                    &mut row,
+                    &symbol.instructions[row_index],
+                    symbol,
+                    appearance,
+                    ins_view_state,
+                );
+            } else {
+                empty_col_ui(&mut row);
+            }
         });
     });
     Some(())
 }
 
-pub fn function_diff_ui(
-    ui: &mut egui::Ui,
-    jobs: &JobQueue,
-    state: &mut DiffViewState,
-    appearance: &Appearance,
-) -> bool {
-    let mut rebuild = false;
-    let (Some(result), Some(selected_symbol)) = (&state.build, &state.selected_symbol) else {
-        return rebuild;
+pub fn function_diff_ui(ui: &mut egui::Ui, state: &mut DiffViewState, appearance: &Appearance) {
+    let (Some(result), Some(selected_symbol)) = (&state.build, &state.symbol_state.selected_symbol)
+    else {
+        return;
     };
 
     // Header
@@ -459,13 +617,16 @@ pub fn function_diff_ui(
                     ui.set_width(column_width);
 
                     ui.horizontal(|ui| {
-                        if ui.button("Build").clicked() {
-                            rebuild = true;
+                        if ui
+                            .add_enabled(!state.build_running, egui::Button::new("Build"))
+                            .clicked()
+                        {
+                            state.queue_build = true;
                         }
                         ui.scope(|ui| {
                             ui.style_mut().override_text_style = Some(egui::TextStyle::Monospace);
                             ui.style_mut().wrap = Some(false);
-                            if jobs.is_running(Job::ObjDiff) {
+                            if state.build_running {
                                 ui.colored_label(appearance.replace_color, "Building…");
                             } else {
                                 ui.label("Last built:");
@@ -495,7 +656,7 @@ pub fn function_diff_ui(
                                 &format!("{match_percent:.0}%"),
                             );
                         } else {
-                            ui.label("");
+                            ui.colored_label(appearance.replace_color, "Missing");
                         }
                         ui.label("Diff base:");
                     });
@@ -506,16 +667,20 @@ pub fn function_diff_ui(
     ui.separator();
 
     // Table
-    if let (Some(left_obj), Some(right_obj)) = (&result.first_obj, &result.second_obj) {
-        let available_height = ui.available_height();
-        let table = TableBuilder::new(ui)
-            .striped(false)
-            .cell_layout(Layout::left_to_right(Align::Min))
-            .columns(Column::exact(column_width).clip(true), 2)
-            .resizable(false)
-            .auto_shrink([false, false])
-            .min_scrolled_height(available_height);
-        asm_table_ui(table, left_obj, right_obj, selected_symbol, appearance);
-    }
-    rebuild
+    let available_height = ui.available_height();
+    let table = TableBuilder::new(ui)
+        .striped(false)
+        .cell_layout(Layout::left_to_right(Align::Min))
+        .columns(Column::exact(column_width).clip(true), 2)
+        .resizable(false)
+        .auto_shrink([false, false])
+        .min_scrolled_height(available_height);
+    asm_table_ui(
+        table,
+        result.first_obj.as_ref(),
+        result.second_obj.as_ref(),
+        selected_symbol,
+        appearance,
+        &mut state.function_state,
+    );
 }

src/views/jobs.rs

@@ -1,4 +1,4 @@
-use egui::{ProgressBar, Widget};
+use egui::{ProgressBar, RichText, Widget};
 
 use crate::{jobs::JobQueue, views::appearance::Appearance};
 
@@ -31,7 +31,7 @@ pub fn jobs_ui(ui: &mut egui::Ui, jobs: &mut JobQueue, appearance: &Appearance)
             bar.ui(ui);
             const STATUS_LENGTH: usize = 80;
             if let Some(err) = &status.error {
-                let err_string = err.to_string();
+                let err_string = format!("{:#}", err);
                 ui.colored_label(
                     appearance.delete_color,
                     if err_string.len() > STATUS_LENGTH - 10 {
@@ -39,13 +39,15 @@ pub fn jobs_ui(ui: &mut egui::Ui, jobs: &mut JobQueue, appearance: &Appearance)
                     } else {
                         format!("Error: {:width$}", err_string, width = STATUS_LENGTH - 7)
                     },
-                );
+                )
+                .on_hover_text_at_pointer(RichText::new(err_string).color(appearance.delete_color));
             } else {
                 ui.label(if status.status.len() > STATUS_LENGTH - 3 {
                     format!("{}…", &status.status[0..STATUS_LENGTH - 3])
                 } else {
                     format!("{:width$}", &status.status, width = STATUS_LENGTH)
-                });
+                })
+                .on_hover_text_at_pointer(&status.status);
             }
         });
     }

src/views/symbol_diff.rs

@@ -1,13 +1,19 @@
+use std::mem::take;
+
 use egui::{
-    text::LayoutJob, Align, CollapsingHeader, Color32, Layout, Rgba, ScrollArea, SelectableLabel,
+    text::LayoutJob, Align, CollapsingHeader, Color32, Layout, ScrollArea, SelectableLabel,
     TextEdit, Ui, Vec2, Widget,
 };
 use egui_extras::{Size, StripBuilder};
 
 use crate::{
-    jobs::objdiff::{BuildStatus, ObjDiffResult},
+    app::AppConfigRef,
+    jobs::{
+        objdiff::{BuildStatus, ObjDiffResult},
+        Job, JobQueue, JobResult,
+    },
     obj::{ObjInfo, ObjSection, ObjSectionKind, ObjSymbol, ObjSymbolFlags},
-    views::{appearance::Appearance, write_text},
+    views::{appearance::Appearance, function_diff::FunctionViewState, write_text},
 };
 
 pub struct SymbolReference {
@@ -16,7 +22,7 @@ pub struct SymbolReference {
 }
 
 #[allow(clippy::enum_variant_names)]
-#[derive(Default, Eq, PartialEq)]
+#[derive(Default, Eq, PartialEq, Copy, Clone)]
 pub enum View {
     #[default]
     SymbolDiff,
@@ -28,9 +34,53 @@ pub enum View {
 pub struct DiffViewState {
     pub build: Option<Box<ObjDiffResult>>,
     pub current_view: View,
+    pub symbol_state: SymbolViewState,
+    pub function_state: FunctionViewState,
+    pub search: String,
+    pub queue_build: bool,
+    pub build_running: bool,
+}
+
+#[derive(Default)]
+pub struct SymbolViewState {
     pub highlighted_symbol: Option<String>,
     pub selected_symbol: Option<SymbolReference>,
-    pub search: String,
+    pub reverse_fn_order: bool,
+    pub disable_reverse_fn_order: bool,
+    pub show_hidden_symbols: bool,
+}
+
+impl DiffViewState {
+    pub fn pre_update(&mut self, jobs: &mut JobQueue, config: &AppConfigRef) {
+        jobs.results.retain_mut(|result| {
+            if let JobResult::ObjDiff(result) = result {
+                self.build = take(result);
+                false
+            } else {
+                true
+            }
+        });
+        self.build_running = jobs.is_running(Job::ObjDiff);
+
+        self.symbol_state.disable_reverse_fn_order = false;
+        if let Ok(config) = config.read() {
+            if let Some(obj_config) = &config.selected_obj {
+                if let Some(value) = obj_config.reverse_fn_order {
+                    self.symbol_state.reverse_fn_order = value;
+                    self.symbol_state.disable_reverse_fn_order = true;
+                }
+            }
+        }
+    }
+
+    pub fn post_update(&mut self, _jobs: &mut JobQueue, config: &AppConfigRef) {
+        if self.queue_build {
+            self.queue_build = false;
+            if let Ok(mut config) = config.write() {
+                config.queue_build = true;
+            }
+        }
+    }
 }
 
 pub fn match_color_for_symbol(match_percent: f32, appearance: &Appearance) -> Color32 {
@@ -79,30 +129,28 @@ fn symbol_hover_ui(ui: &mut Ui, symbol: &ObjSymbol, appearance: &Appearance) {
     });
 }
 
+#[must_use]
 fn symbol_ui(
     ui: &mut Ui,
     symbol: &ObjSymbol,
     section: Option<&ObjSection>,
-    highlighted_symbol: &mut Option<String>,
-    selected_symbol: &mut Option<SymbolReference>,
-    current_view: &mut View,
+    state: &mut SymbolViewState,
     appearance: &Appearance,
-) {
+) -> Option<View> {
+    if symbol.flags.0.contains(ObjSymbolFlags::Hidden) && !state.show_hidden_symbols {
+        return None;
+    }
+    let mut ret = None;
     let mut job = LayoutJob::default();
     let name: &str =
         if let Some(demangled) = &symbol.demangled_name { demangled } else { &symbol.name };
     let mut selected = false;
-    if let Some(sym) = highlighted_symbol {
+    if let Some(sym) = &state.highlighted_symbol {
         selected = sym == &symbol.name;
     }
     write_text("[", appearance.text_color, &mut job, appearance.code_font.clone());
     if symbol.flags.0.contains(ObjSymbolFlags::Common) {
-        write_text(
-            "c",
-            appearance.replace_color, /* Color32::from_rgb(0, 255, 255) */
-            &mut job,
-            appearance.code_font.clone(),
-        );
+        write_text("c", appearance.replace_color, &mut job, appearance.code_font.clone());
     } else if symbol.flags.0.contains(ObjSymbolFlags::Global) {
         write_text("g", appearance.insert_color, &mut job, appearance.code_font.clone());
     } else if symbol.flags.0.contains(ObjSymbolFlags::Local) {
@@ -111,6 +159,9 @@ fn symbol_ui(
     if symbol.flags.0.contains(ObjSymbolFlags::Weak) {
         write_text("w", appearance.text_color, &mut job, appearance.code_font.clone());
     }
+    if symbol.flags.0.contains(ObjSymbolFlags::Hidden) {
+        write_text("h", appearance.deemphasized_text_color, &mut job, appearance.code_font.clone());
+    }
     write_text("] ", appearance.text_color, &mut job, appearance.code_font.clone());
     if let Some(match_percent) = symbol.match_percent {
         write_text("(", appearance.text_color, &mut job, appearance.code_font.clone());
@@ -130,22 +181,23 @@ fn symbol_ui(
     if response.clicked() {
         if let Some(section) = section {
             if section.kind == ObjSectionKind::Code {
-                *selected_symbol = Some(SymbolReference {
+                state.selected_symbol = Some(SymbolReference {
                     symbol_name: symbol.name.clone(),
                     section_name: section.name.clone(),
                 });
-                *current_view = View::FunctionDiff;
+                ret = Some(View::FunctionDiff);
             } else if section.kind == ObjSectionKind::Data {
-                *selected_symbol = Some(SymbolReference {
+                state.selected_symbol = Some(SymbolReference {
                     symbol_name: section.name.clone(),
                     section_name: section.name.clone(),
                 });
-                *current_view = View::DataDiff;
+                ret = Some(View::DataDiff);
             }
         }
     } else if response.hovered() {
-        *highlighted_symbol = Some(symbol.name.clone());
+        state.highlighted_symbol = Some(symbol.name.clone());
     }
+    ret
 }
 
 fn symbol_matches_search(symbol: &ObjSymbol, search_str: &str) -> bool {
@@ -158,16 +210,15 @@ fn symbol_matches_search(symbol: &ObjSymbol, search_str: &str) -> bool {
             .unwrap_or(false)
 }
 
-#[allow(clippy::too_many_arguments)]
+#[must_use]
 fn symbol_list_ui(
     ui: &mut Ui,
     obj: &ObjInfo,
-    highlighted_symbol: &mut Option<String>,
-    selected_symbol: &mut Option<SymbolReference>,
-    current_view: &mut View,
+    state: &mut SymbolViewState,
     lower_search: &str,
     appearance: &Appearance,
-) {
+) -> Option<View> {
+    let mut ret = None;
     ScrollArea::both().auto_shrink([false, false]).show(ui, |ui| {
         ui.scope(|ui| {
             ui.style_mut().override_text_style = Some(egui::TextStyle::Monospace);
@@ -176,15 +227,7 @@ fn symbol_list_ui(
             if !obj.common.is_empty() {
                 CollapsingHeader::new(".comm").default_open(true).show(ui, |ui| {
                     for symbol in &obj.common {
-                        symbol_ui(
-                            ui,
-                            symbol,
-                            None,
-                            highlighted_symbol,
-                            selected_symbol,
-                            current_view,
-                            appearance,
-                        );
+                        ret = ret.or(symbol_ui(ui, symbol, None, state, appearance));
                     }
                 });
             }
@@ -193,41 +236,28 @@ fn symbol_list_ui(
                 CollapsingHeader::new(format!("{} ({:x})", section.name, section.size))
                     .default_open(true)
                     .show(ui, |ui| {
-                        if section.kind == ObjSectionKind::Code && appearance.reverse_fn_order {
+                        if section.kind == ObjSectionKind::Code && state.reverse_fn_order {
                             for symbol in section.symbols.iter().rev() {
                                 if !symbol_matches_search(symbol, lower_search) {
                                     continue;
                                 }
-                                symbol_ui(
-                                    ui,
-                                    symbol,
-                                    Some(section),
-                                    highlighted_symbol,
-                                    selected_symbol,
-                                    current_view,
-                                    appearance,
-                                );
+                                ret =
+                                    ret.or(symbol_ui(ui, symbol, Some(section), state, appearance));
                             }
                         } else {
                             for symbol in &section.symbols {
                                 if !symbol_matches_search(symbol, lower_search) {
                                     continue;
                                 }
-                                symbol_ui(
-                                    ui,
-                                    symbol,
-                                    Some(section),
-                                    highlighted_symbol,
-                                    selected_symbol,
-                                    current_view,
-                                    appearance,
-                                );
+                                ret =
+                                    ret.or(symbol_ui(ui, symbol, Some(section), state, appearance));
                             }
                         }
                     });
             }
         });
     });
+    ret
 }
 
 fn build_log_ui(ui: &mut Ui, status: &BuildStatus, appearance: &Appearance) {
@@ -241,8 +271,17 @@ fn build_log_ui(ui: &mut Ui, status: &BuildStatus, appearance: &Appearance) {
     });
 }
 
+fn missing_obj_ui(ui: &mut Ui, appearance: &Appearance) {
+    ui.scope(|ui| {
+        ui.style_mut().override_text_style = Some(egui::TextStyle::Monospace);
+        ui.style_mut().wrap = Some(false);
+
+        ui.colored_label(appearance.replace_color, "No object configured");
+    });
+}
+
 pub fn symbol_diff_ui(ui: &mut Ui, state: &mut DiffViewState, appearance: &Appearance) {
-    let DiffViewState { build, current_view, highlighted_symbol, selected_symbol, search } = state;
+    let DiffViewState { build, current_view, symbol_state, search, .. } = state;
     let Some(result) = build else {
         return;
     };
@@ -267,9 +306,13 @@ pub fn symbol_diff_ui(ui: &mut Ui, state: &mut DiffViewState, appearance: &Appea
 
                         ui.label("Build target:");
                         if result.first_status.success {
-                            ui.label("OK");
+                            if result.first_obj.is_none() {
+                                ui.colored_label(appearance.replace_color, "Missing");
+                            } else {
+                                ui.label("OK");
+                            }
                         } else {
-                            ui.colored_label(Rgba::from_rgb(1.0, 0.0, 0.0), "Fail");
+                            ui.colored_label(appearance.delete_color, "Fail");
                         }
                     });
 
@@ -290,11 +333,19 @@ pub fn symbol_diff_ui(ui: &mut Ui, state: &mut DiffViewState, appearance: &Appea
 
                         ui.label("Build base:");
                         if result.second_status.success {
-                            ui.label("OK");
+                            if result.second_obj.is_none() {
+                                ui.colored_label(appearance.replace_color, "Missing");
+                            } else {
+                                ui.label("OK");
+                            }
                         } else {
-                            ui.colored_label(Rgba::from_rgb(1.0, 0.0, 0.0), "Fail");
+                            ui.colored_label(appearance.delete_color, "Fail");
                         }
                     });
+
+                    if ui.add_enabled(!state.build_running, egui::Button::new("Build")).clicked() {
+                        state.queue_build = true;
+                    }
                 },
             );
         },
@@ -302,6 +353,7 @@ pub fn symbol_diff_ui(ui: &mut Ui, state: &mut DiffViewState, appearance: &Appea
     ui.separator();
 
     // Table
+    let mut ret = None;
     let lower_search = search.to_ascii_lowercase();
     StripBuilder::new(ui).size(Size::remainder()).vertical(|mut strip| {
         strip.strip(|builder| {
@@ -310,15 +362,15 @@ pub fn symbol_diff_ui(ui: &mut Ui, state: &mut DiffViewState, appearance: &Appea
                     ui.push_id("left", |ui| {
                         if result.first_status.success {
                             if let Some(obj) = &result.first_obj {
-                                symbol_list_ui(
+                                ret = ret.or(symbol_list_ui(
                                     ui,
                                     obj,
-                                    highlighted_symbol,
-                                    selected_symbol,
-                                    current_view,
+                                    symbol_state,
                                     &lower_search,
                                     appearance,
-                                );
+                                ));
+                            } else {
+                                missing_obj_ui(ui, appearance);
                             }
                         } else {
                             build_log_ui(ui, &result.first_status, appearance);
@@ -329,15 +381,15 @@ pub fn symbol_diff_ui(ui: &mut Ui, state: &mut DiffViewState, appearance: &Appea
                     ui.push_id("right", |ui| {
                         if result.second_status.success {
                             if let Some(obj) = &result.second_obj {
-                                symbol_list_ui(
+                                ret = ret.or(symbol_list_ui(
                                     ui,
                                     obj,
-                                    highlighted_symbol,
-                                    selected_symbol,
-                                    current_view,
+                                    symbol_state,
                                     &lower_search,
                                     appearance,
-                                );
+                                ));
+                            } else {
+                                missing_obj_ui(ui, appearance);
                             }
                         } else {
                             build_log_ui(ui, &result.second_status, appearance);
@@ -347,4 +399,8 @@ pub fn symbol_diff_ui(ui: &mut Ui, state: &mut DiffViewState, appearance: &Appea
             });
         });
     });
+
+    if let Some(view) = ret {
+        *current_view = view;
+    }
 }