Adjust "Diffable" to exclude missing target objects

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 = "0.4.1"
+version = "0.5.2"
 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"
@@ -22,46 +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 = "0.1.6"
 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']
-ron = "0.8.0"
-semver = "1.0.17"
+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"
@@ -83,5 +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"] }

src/app.rs

@@ -1,5 +1,6 @@
 use std::{
     default::Default,
+    fs,
     path::{Path, PathBuf},
     rc::Rc,
     sync::{
@@ -9,16 +10,18 @@ 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::{
     app_config::{deserialize_config, AppConfigVersion},
-    config::{
-        build_globset, load_project_config, ProjectObject, ProjectObjectNode, CONFIG_FILENAMES,
+    config::{build_globset, load_project_config, ProjectObject, ProjectObjectNode},
+    jobs::{
+        objdiff::{start_build, ObjDiffConfig},
+        Job, JobQueue, JobResult, JobStatus,
     },
-    jobs::{objdiff::start_build, Job, JobQueue, JobResult, JobStatus},
     views::{
         appearance::{appearance_window, Appearance},
         config::{config_ui, project_window, ConfigViewState, DEFAULT_WATCH_PATTERNS},
@@ -51,26 +54,50 @@ pub struct ObjectConfig {
     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>,
+    #[serde(default)]
     pub selected_obj: Option<ObjectConfig>,
+    #[serde(default = "bool_true")]
+    pub build_base: bool,
+    #[serde(default)]
     pub build_target: 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 objects: Vec<ProjectObject>,
@@ -85,7 +112,9 @@ pub struct AppConfig {
     #[serde(skip)]
     pub queue_build: bool,
     #[serde(skip)]
-    pub project_config_loaded: bool,
+    pub queue_reload: bool,
+    #[serde(skip)]
+    pub project_config_info: Option<ProjectConfigInfo>,
 }
 
 impl Default for AppConfig {
@@ -98,23 +127,31 @@ impl Default for AppConfig {
             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,
-            project_config_loaded: 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;
@@ -126,7 +163,7 @@ impl AppConfig {
         self.config_change = true;
         self.obj_change = true;
         self.queue_build = false;
-        self.project_config_loaded = false;
+        self.project_config_info = None;
     }
 
     pub fn set_target_obj_dir(&mut self, path: PathBuf) {
@@ -158,7 +195,6 @@ pub struct App {
     view_state: ViewState,
     config: AppConfigRef,
     modified: Arc<AtomicBool>,
-    config_modified: Arc<AtomicBool>,
     watcher: Option<notify::RecommendedWatcher>,
     relaunch_path: Rc<Mutex<Option<PathBuf>>>,
     should_relaunch: bool,
@@ -264,8 +300,10 @@ impl App {
         };
         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 {
@@ -283,21 +321,14 @@ 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;
             }
@@ -315,11 +346,32 @@ impl App {
             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(self.config.clone()));
+            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;
         }
     }
 }
@@ -351,6 +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();
@@ -365,6 +442,29 @@ 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",
+                    );
+                });
             });
         });
 
@@ -416,16 +516,9 @@ 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(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 {
@@ -440,9 +533,7 @@ fn create_watcher(
                         let Ok(path) = path.strip_prefix(&base_dir) else {
                             continue;
                         };
-                        if config_patterns.is_match(path) {
-                            config_modified.store(true, Ordering::Relaxed);
-                        } else if patterns.is_match(path) {
+                        if patterns.is_match(path) {
                             modified.store(true, Ordering::Relaxed);
                         }
                     }
@@ -453,3 +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/config.rs

@@ -1,33 +1,54 @@
 use std::{
     fs::File,
+    io::Read,
     path::{Component, Path, PathBuf},
 };
 
-use anyhow::{bail, Context, Result};
+use anyhow::{bail, Result};
+use filetime::FileTime;
 use globset::{Glob, GlobSet, GlobSetBuilder};
 
-use crate::{app::AppConfig, views::config::DEFAULT_WATCH_PATTERNS};
+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,
+    #[serde(default)]
     pub watch_patterns: Option<Vec<Glob>>,
-    #[serde(alias = "units")]
+    #[serde(default, alias = "units")]
     pub objects: Vec<ProjectObject>,
 }
 
 #[derive(Default, Clone, serde::Deserialize)]
 pub struct ProjectObject {
+    #[serde(default)]
     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>,
 }
 
@@ -120,7 +141,7 @@ 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");
@@ -133,6 +154,7 @@ pub fn load_project_config(config: &mut AppConfig) -> Result<()> {
         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.unwrap_or_else(|| {
             DEFAULT_WATCH_PATTERNS.iter().map(|s| Glob::new(s).unwrap()).collect()
@@ -141,34 +163,39 @@ pub fn load_project_config(config: &mut AppConfig) -> Result<()> {
         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_loaded = true;
+        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/jobs/objdiff.rs

@@ -1,10 +1,15 @@
-use std::{path::Path, process::Command, str::from_utf8, sync::mpsc::Receiver};
+use std::{
+    path::{Path, PathBuf},
+    process::Command,
+    str::from_utf8,
+    sync::mpsc::Receiver,
+};
 
 use anyhow::{anyhow, Context, Error, Result};
 use time::OffsetDateTime;
 
 use crate::{
-    app::{AppConfig, AppConfigRef},
+    app::{AppConfig, ObjectConfig},
     diff::diff_objs,
     jobs::{start_job, update_status, Job, JobResult, JobState, JobStatusRef},
     obj::{elf, ObjInfo},
@@ -15,6 +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,
@@ -23,7 +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))]
@@ -73,9 +100,8 @@ fn run_make(cwd: &Path, arg: &Path, config: &AppConfig) -> BuildStatus {
 fn run_build(
     status: &JobStatusRef,
     cancel: Receiver<()>,
-    config: AppConfigRef,
+    config: ObjDiffConfig,
 ) -> Result<Box<ObjDiffResult>> {
-    let config = config.read().map_err(|_| Error::msg("Failed to lock app config"))?.clone();
     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"))?;
@@ -106,7 +132,7 @@ fn run_build(
     if config.build_target && target_path_rel.is_some() {
         total += 1;
     }
-    if base_path_rel.is_some() {
+    if config.build_base && base_path_rel.is_some() {
         total += 1;
     }
     let first_status = match target_path_rel {
@@ -123,17 +149,18 @@ fn run_build(
         _ => BuildStatus { success: true, log: String::new() },
     };
 
-    let second_status = if let Some(base_path_rel) = base_path_rel {
-        update_status(
-            status,
-            format!("Building base {}", base_path_rel.display()),
-            1,
-            total,
-            &cancel,
-        )?;
-        run_make(project_dir, base_path_rel, &config)
-    } else {
-        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();
@@ -179,7 +206,7 @@ fn run_build(
     Ok(Box::new(ObjDiffResult { first_status, second_status, first_obj, second_obj, time }))
 }
 
-pub fn start_build(config: AppConfigRef) -> JobState {
+pub fn start_build(config: ObjDiffConfig) -> JobState {
     start_job("Object diff", Job::ObjDiff, move |status, cancel| {
         run_build(status, cancel, config).map(|result| JobResult::ObjDiff(Some(result)))
     })

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/config.rs

@@ -438,7 +438,8 @@ fn filter_node(
     match node {
         ProjectObjectNode::File(name, object) => {
             if (search.is_empty() || name.to_ascii_lowercase().contains(search))
-                && (!filter_diffable || object.base_path.is_some())
+                && (!filter_diffable
+                    || (object.base_path.is_some() && object.target_path.is_some()))
             {
                 Some(node.clone())
             } else {
@@ -616,7 +617,7 @@ fn split_obj_config_ui(
                 ui.label(job);
             },
             appearance,
-            !config.project_config_loaded,
+            config.project_config_info.is_none(),
         );
         if response.clicked() {
             if let Some(path) = rfd::FileDialog::new().set_directory(&project_dir).pick_folder() {
@@ -666,13 +667,36 @@ fn split_obj_config_ui(
                 ui.label(job);
             },
             appearance,
-            !config.project_config_loaded,
+            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();
     }
 

src/views/function_diff.rs

@@ -1,9 +1,12 @@
-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;
 
@@ -19,21 +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(),
+            );
         }
         _ => {}
     }
@@ -42,57 +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());
         }
     };
 }
@@ -102,8 +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 => {
@@ -113,49 +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,
                 );
             }
@@ -163,41 +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());
+            }
         }
     }
 }
@@ -209,6 +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 {
@@ -316,7 +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);
     }
@@ -345,34 +435,95 @@ 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(
@@ -381,22 +532,35 @@ fn asm_table_ui(
     right_obj: Option<&ObjInfo>,
     selected_symbol: &SymbolReference,
     appearance: &Appearance,
+    ins_view_state: &mut FunctionViewState,
 ) -> Option<()> {
     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(())
@@ -517,5 +681,6 @@ pub fn function_diff_ui(ui: &mut egui::Ui, state: &mut DiffViewState, appearance
         result.second_obj.as_ref(),
         selected_symbol,
         appearance,
+        &mut state.function_state,
     );
 }

src/views/symbol_diff.rs

@@ -13,7 +13,7 @@ use crate::{
         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 {
@@ -35,6 +35,7 @@ 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,
@@ -46,6 +47,7 @@ pub struct SymbolViewState {
     pub selected_symbol: Option<SymbolReference>,
     pub reverse_fn_order: bool,
     pub disable_reverse_fn_order: bool,
+    pub show_hidden_symbols: bool,
 }
 
 impl DiffViewState {
@@ -135,6 +137,9 @@ fn symbol_ui(
     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 =
@@ -154,6 +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());
@@ -335,13 +343,9 @@ pub fn symbol_diff_ui(ui: &mut Ui, state: &mut DiffViewState, appearance: &Appea
                         }
                     });
 
-                    ui.add_enabled(
-                        !symbol_state.disable_reverse_fn_order,
-                        egui::Checkbox::new(
-                            &mut symbol_state.reverse_fn_order,
-                            "Reverse function order (-inline deferred)",
-                        ),
-                    );
+                    if ui.add_enabled(!state.build_running, egui::Button::new("Build")).clicked() {
+                        state.queue_build = true;
+                    }
                 },
             );
         },