I forgot to bump the Cargo.toml version, oops

- Support `completed` field for objects in project config. In object tree, displays red for incomplete, green for complete.
- Add support for one-sided diffs. A project can include objects without an associated source file for viewing.
- Add versioning to AppConfig, supporting upgrades without losing user configuration.

Cargo.lock

@@ -2457,7 +2457,7 @@ dependencies = [
 
 [[package]]
 name = "objdiff"
-version = "0.4.1"
+version = "0.4.3"
 dependencies = [
  "anyhow",
  "byteorder",
@@ -2483,7 +2483,9 @@ dependencies = [
  "rabbitizer",
  "reqwest",
  "rfd",
+ "ron",
  "self_update",
+ "semver",
  "serde",
  "serde_json",
  "serde_yaml",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "objdiff"
-version = "0.4.1"
+version = "0.4.3"
 edition = "2021"
 rust-version = "1.65"
 authors = ["Luke Street <luke@street.dev>"]
@@ -42,6 +42,8 @@ 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"
 serde = { version = "1", features = ["derive"] }
 serde_json = "1.0.104"
 serde_yaml = "0.9.25"

src/app.rs

@@ -14,13 +14,14 @@ use notify::{RecursiveMode, Watcher};
 use time::UtcOffset;
 
 use crate::{
+    app_config::{deserialize_config, AppConfigVersion},
     config::{
         build_globset, load_project_config, ProjectObject, ProjectObjectNode, CONFIG_FILENAMES,
     },
     jobs::{objdiff::start_build, 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,
@@ -44,16 +45,21 @@ pub struct ViewState {
 #[derive(Clone, Eq, PartialEq, serde::Deserialize, serde::Serialize)]
 pub struct ObjectConfig {
     pub name: String,
-    pub target_path: PathBuf,
-    pub base_path: PathBuf,
+    pub target_path: Option<PathBuf>,
+    pub base_path: Option<PathBuf>,
     pub reverse_fn_order: Option<bool>,
+    pub complete: Option<bool>,
 }
 
 #[inline]
 fn bool_true() -> bool { true }
 
-#[derive(Default, Clone, serde::Deserialize, serde::Serialize)]
+#[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,
     pub custom_make: Option<String>,
     pub selected_wsl_distro: Option<String>,
     pub project_dir: Option<PathBuf>,
@@ -82,6 +88,31 @@ pub struct AppConfig {
     pub project_config_loaded: bool,
 }
 
+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_target: false,
+            rebuild_on_changes: true,
+            auto_update_check: true,
+            watch_patterns: DEFAULT_WATCH_PATTERNS.iter().map(|s| Glob::new(s).unwrap()).collect(),
+            objects: vec![],
+            object_nodes: vec![],
+            watcher_change: false,
+            config_change: false,
+            obj_change: false,
+            queue_build: false,
+            project_config_loaded: false,
+        }
+    }
+}
+
 impl AppConfig {
     pub fn set_project_dir(&mut self, path: PathBuf) {
         self.project_dir = Some(path);
@@ -133,8 +164,8 @@ pub struct App {
     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.
@@ -153,7 +184,7 @@ 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;

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

@@ -3,7 +3,7 @@ use std::{
     path::{Component, Path, PathBuf},
 };
 
-use anyhow::{Context, Result};
+use anyhow::{bail, Context, Result};
 use globset::{Glob, GlobSet, GlobSetBuilder};
 
 use crate::{app::AppConfig, views::config::DEFAULT_WATCH_PATTERNS};
@@ -11,6 +11,7 @@ use crate::{app::AppConfig, views::config::DEFAULT_WATCH_PATTERNS};
 #[derive(Default, Clone, serde::Deserialize)]
 #[serde(default)]
 pub struct ProjectConfig {
+    pub min_version: Option<String>,
     pub custom_make: Option<String>,
     pub target_dir: Option<PathBuf>,
     pub base_dir: Option<PathBuf>,
@@ -27,6 +28,7 @@ pub struct ProjectObject {
     pub target_path: Option<PathBuf>,
     pub base_path: Option<PathBuf>,
     pub reverse_fn_order: Option<bool>,
+    pub complete: Option<bool>,
 }
 
 impl ProjectObject {
@@ -120,6 +122,14 @@ pub fn load_project_config(config: &mut AppConfig) -> Result<()> {
     };
     if let Some(result) = 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));

src/diff.rs

@@ -372,12 +372,15 @@ fn find_section_and_symbol(obj: &ObjInfo, name: &str) -> Option<(usize, usize)>
     None
 }
 
-pub fn diff_objs(left: &mut ObjInfo, right: &mut ObjInfo) -> Result<()> {
+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_section_idx, right_symbol_idx)) =
-                    find_section_and_symbol(right, &left_symbol.name)
+                    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];
@@ -404,21 +407,24 @@ pub fn diff_objs(left: &mut ObjInfo, right: &mut ObjInfo) -> Result<()> {
                         )?;
                     }
                 }
-        } else {
-            let Some(right_section) =
-                right.sections.iter_mut().find(|s| s.name == left_section.name)
-            else {
-                continue;
-            };
+            } 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) {
+    }
+    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(
@@ -430,8 +436,16 @@ pub fn diff_objs(left: &mut ObjInfo, right: &mut ObjInfo) -> Result<()> {
                         )?;
                     }
                 }
+            } else if right_section.kind == ObjSectionKind::Data
+                && right_section.data_diff.is_empty()
+            {
+                no_diff_data(right_section);
             }
+        }
+    }
+    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/objdiff.rs

@@ -79,56 +79,101 @@ fn run_build(
     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 target_path_rel = obj_config.target_path.strip_prefix(project_dir).map_err(|_| {
+    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 '{}'",
-            obj_config.target_path.display(),
+                target_path.display(),
                 project_dir.display()
             )
-    })?;
-    let base_path_rel = obj_config.base_path.strip_prefix(project_dir).map_err(|_| {
+        })?)
+    } else {
+        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 '{}'",
-            obj_config.base_path.display(),
+                base_path.display(),
                 project_dir.display()
             )
-    })?;
+        })?)
+    } else {
+        None
+    };
 
-    let total = if config.build_target { 5 } else { 4 };
-    let first_status = if config.build_target {
-        update_status(status, format!("Building target {}", target_path_rel.display()), 0, total, &cancel)?;
+    let mut total = 3;
+    if config.build_target && target_path_rel.is_some() {
+        total += 1;
+    }
+    if 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 = 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() }
     };
 
-    update_status(status, format!("Building base {}", base_path_rel.display()), 1, total, &cancel)?;
-    let second_status = run_make(project_dir, base_path_rel, &config);
-
     let time = OffsetDateTime::now_utc();
 
-    let mut first_obj = if first_status.success {
-        update_status(status, format!("Loading target {}", target_path_rel.display()), 2, total, &cancel)?;
-        Some(elf::read(&obj_config.target_path).with_context(|| {
-            format!("Failed to read object '{}'", obj_config.target_path.display())
+    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())
                 })?)
-    } else {
-        None
-    };
-
-    let mut second_obj = if second_status.success {
-        update_status(status, format!("Loading base {}", base_path_rel.display()), 3, total, &cancel)?;
-        Some(elf::read(&obj_config.base_path).with_context(|| {
-            format!("Failed to read object '{}'", obj_config.base_path.display())
-        })?)
-    } 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)?;
             }
+            _ => 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,
+    };
+
+    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 }))

src/lib.rs

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

src/views/config.rs

@@ -40,6 +40,7 @@ pub struct ConfigViewState {
     pub watch_pattern_text: String,
     pub load_error: Option<String>,
     pub object_search: String,
+    pub filter_diffable: bool,
     #[cfg(windows)]
     pub available_wsl_distros: Option<Vec<String>>,
 }
@@ -218,17 +219,19 @@ pub fn config_ui(
                         let target_path = target_dir.join(obj_path);
                         new_selected_obj = Some(ObjectConfig {
                             name: obj_path.display().to_string(),
-                            target_path,
-                            base_path: path,
+                            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) {
                         let base_path = base_dir.join(obj_path);
                         new_selected_obj = Some(ObjectConfig {
                             name: obj_path.display().to_string(),
-                            target_path: path,
-                            base_path,
+                            target_path: Some(path),
+                            base_path: Some(base_path),
                             reverse_fn_order: None,
+                            complete: None,
                         });
                     }
                 }
@@ -266,6 +269,13 @@ pub fn config_ui(
                 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 {
@@ -285,10 +295,13 @@ pub fn config_ui(
         .default_open(true)
         .show(ui, |ui| {
             let mut nodes = Cow::Borrowed(object_nodes);
-            if !state.object_search.is_empty() {
+            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)).collect(),
+                    object_nodes
+                        .iter()
+                        .filter_map(|node| filter_node(node, &search, state.filter_diffable))
+                        .collect(),
                 );
             }
 
@@ -322,8 +335,18 @@ fn display_object(
 ) {
     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 { appearance.text_color };
-    if SelectableLabel::new(
+    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 {
@@ -333,13 +356,16 @@ fn display_object(
             .color(color),
     )
     .ui(ui)
-    .clicked()
-    {
+    .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().unwrap_or_default(),
-            base_path: object.base_path.clone().unwrap_or_default(),
+            target_path: object.target_path.clone(),
+            base_path: object.base_path.clone(),
             reverse_fn_order: object.reverse_fn_order,
+            complete: object.complete,
         });
     }
 }
@@ -404,21 +430,30 @@ fn contains_node(node: &ProjectObjectNode, selected_obj: &ObjectConfig) -> bool
     }
 }
 
-fn filter_node(node: &ProjectObjectNode, search: &str) -> Option<ProjectObjectNode> {
+fn filter_node(
+    node: &ProjectObjectNode,
+    search: &str,
+    filter_diffable: bool,
+) -> Option<ProjectObjectNode> {
     match node {
-        ProjectObjectNode::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
             }
         }
         ProjectObjectNode::Dir(name, children) => {
-            if name.to_ascii_lowercase().contains(search) {
+            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(ProjectObjectNode::Dir(name.clone(), new_children))
             } else {

src/views/data_diff.rs

@@ -132,31 +132,39 @@ 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| {
+                if let Some(left_diffs) = &left_diffs {
                     data_row_ui(ui, address, &left_diffs[row_index], config);
+                }
             });
             row.col(|ui| {
+                if let Some(right_diffs) = &right_diffs {
                     data_row_ui(ui, address, &right_diffs[row_index], config);
+                }
             });
         });
     });
@@ -243,7 +251,6 @@ pub fn data_diff_ui(ui: &mut egui::Ui, state: &mut DiffViewState, appearance: &A
     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)
@@ -252,6 +259,11 @@ pub fn data_diff_ui(ui: &mut egui::Ui, state: &mut DiffViewState, appearance: &A
         .resizable(false)
         .auto_shrink([false, false])
         .min_scrolled_height(available_height);
-        data_table_ui(table, left_obj, right_obj, selected_symbol, appearance);
-    }
+    data_table_ui(
+        table,
+        result.first_obj.as_ref(),
+        result.second_obj.as_ref(),
+        selected_symbol,
+        appearance,
+    );
 }

src/views/function_diff.rs

@@ -377,13 +377,13 @@ fn asm_row_ui(
 
 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,
 ) -> 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| {
@@ -492,7 +492,7 @@ pub fn function_diff_ui(ui: &mut egui::Ui, state: &mut DiffViewState, appearance
                                 &format!("{match_percent:.0}%"),
                             );
                         } else {
-                            ui.label("");
+                            ui.colored_label(appearance.replace_color, "Missing");
                         }
                         ui.label("Diff base:");
                     });
@@ -503,7 +503,6 @@ pub fn function_diff_ui(ui: &mut egui::Ui, state: &mut DiffViewState, appearance
     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)
@@ -512,6 +511,11 @@ pub fn function_diff_ui(ui: &mut egui::Ui, state: &mut DiffViewState, appearance
         .resizable(false)
         .auto_shrink([false, false])
         .min_scrolled_height(available_height);
-        asm_table_ui(table, left_obj, right_obj, selected_symbol, appearance);
-    }
+    asm_table_ui(
+        table,
+        result.first_obj.as_ref(),
+        result.second_obj.as_ref(),
+        selected_symbol,
+        appearance,
+    );
 }

src/views/symbol_diff.rs

@@ -1,7 +1,7 @@
 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};
@@ -263,6 +263,15 @@ 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, symbol_state, search, .. } = state;
     let Some(result) = build else {
@@ -289,9 +298,13 @@ 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.colored_label(Rgba::from_rgb(1.0, 0.0, 0.0), "Fail");
+                                ui.label("OK");
+                            }
+                        } else {
+                            ui.colored_label(appearance.delete_color, "Fail");
                         }
                     });
 
@@ -312,9 +325,13 @@ 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.colored_label(Rgba::from_rgb(1.0, 0.0, 0.0), "Fail");
+                                ui.label("OK");
+                            }
+                        } else {
+                            ui.colored_label(appearance.delete_color, "Fail");
                         }
                     });
 
@@ -348,6 +365,8 @@ pub fn symbol_diff_ui(ui: &mut Ui, state: &mut DiffViewState, appearance: &Appea
                                     &lower_search,
                                     appearance,
                                 ));
+                            } else {
+                                missing_obj_ui(ui, appearance);
                             }
                         } else {
                             build_log_ui(ui, &result.first_status, appearance);
@@ -365,6 +384,8 @@ pub fn symbol_diff_ui(ui: &mut Ui, state: &mut DiffViewState, appearance: &Appea
                                     &lower_search,
                                     appearance,
                                 ));
+                            } else {
+                                missing_obj_ui(ui, appearance);
                             }
                         } else {
                             build_log_ui(ui, &result.second_status, appearance);