Add symbol mapping & diff UI improvements

2026-07-10 12:18:37 -07:00 · 2025-05-27 22:15:56 -06:00
parent 047c28560f
commit 3a86f14bfa
22 changed files with 2872 additions and 1330 deletions
@@ -24,34 +24,34 @@
    "@vscode/codicons": "^0.0.36",
    "clsx": "^2.1.1",
    "memoize-one": "^6.0.0",
-    "objdiff-wasm": "3.0.0-beta.8",
+    "objdiff-wasm": "3.0.0-beta.9",
    "picomatch": "^4.0.2",
    "react": "^18.3.1",
    "react-dom": "^18.3.1",
-    "react-tooltip": "^5.28.0",
-    "react-virtualized-auto-sizer": "^1.0.24",
-    "react-window": "^1.8.10",
-    "shescape": "^2.1.1",
-    "zustand": "^5.0.2"
+    "react-tooltip": "^5.28.1",
+    "react-virtualized-auto-sizer": "^1.0.26",
+    "react-window": "^1.8.11",
+    "shescape": "^2.1.3",
+    "zustand": "^5.0.4"
  },
  "devDependencies": {
-    "@biomejs/biome": "^1.9.3",
-    "@rsbuild/core": "^1.1.8",
-    "@rsbuild/plugin-react": "^1.0.7",
-    "@rsbuild/plugin-type-check": "^1.1.0",
+    "@biomejs/biome": "^1.9.4",
+    "@rsbuild/core": "^1.3.20",
+    "@rsbuild/plugin-react": "^1.3.1",
+    "@rsbuild/plugin-type-check": "^1.2.2",
    "@rsbuild/plugin-typed-css-modules": "^1.0.2",
-    "@types/node": "^22.10.2",
-    "@types/picomatch": "^3.0.1",
-    "@types/react": "^18.3.1",
-    "@types/react-dom": "^18.3.1",
+    "@types/node": "^22.15.18",
+    "@types/picomatch": "^3.0.2",
+    "@types/react": "^18.3.21",
+    "@types/react-dom": "^18.3.7",
    "@types/react-window": "^1.8.8",
-    "@types/vscode": "^1.96.0",
+    "@types/vscode": "^1.100.0",
    "@types/vscode-webview": "^1.57.5",
    "@vscode/test-cli": "^0.0.10",
-    "@vscode/test-electron": "^2.4.1",
-    "@vscode/vsce": "^3.2.2",
-    "tsx": "^4.19.2",
-    "typescript": "^5.7.2"
+    "@vscode/test-electron": "^2.5.2",
+    "@vscode/vsce": "^3.4.0",
+    "tsx": "^4.19.4",
+    "typescript": "^5.8.3"
  },
  "main": "./dist/extension.js",
  "files": [
@@ -27,6 +27,7 @@ export type StateMessage = {
  leftObject?: ArrayBuffer | null;
  rightObject?: ArrayBuffer | null;
  projectConfig?: ProjectConfig | null;
+  diffLabel?: string | null;
 };

 // decomp.me colors
@@ -15,9 +15,7 @@
    "allowImportingTsExtensions": true,

    /* type checking */
-    "strict": true,
-    "noUnusedLocals": true,
-    "noUnusedParameters": true
+    "strict": true
  },
  "include": ["src", "webview", "shared"]
 }
@@ -49,6 +49,14 @@
    --vscode-list-hoverBackground,
    light-dark(#f2f2f2, #2a2d2e)
  );
+  --list-row-selection-background: var(
+    --vscode-list-inactiveSelectionBackground,
+    light-dark(#e4e6f1, #37373d)
+  );
+  --list-row-highlight-background: var(
+    --vscode-list-activeSelectionBackground,
+    light-dark(#e8e8e8, #04395e)
+  );

  --line-number-foreground: var(--vscode-editorLineNumber-foreground, #6e7681);

@@ -1,50 +1,77 @@
 import './App.css';

-import type { diff, display } from 'objdiff-wasm';
+import type { diff } from 'objdiff-wasm';
+import { useMemo } from 'react';
 import { useShallow } from 'zustand/react/shallow';
+import { useDiff } from './diff';
 import { useAppStore, useExtensionStore } from './state';
-import type { SymbolRefByName } from './state';
-import FunctionView from './views/FunctionView';
+import DiffView from './views/DiffView';
 import SettingsView from './views/SettingsView';
-import SymbolsView from './views/SymbolsView';
 import UnitsView from './views/UnitsView';

-const findSymbol = (
-  obj: diff.ObjectDiff | undefined,
-  symbolRef: SymbolRefByName | null,
-): display.SectionDisplaySymbol | null => {
-  if (!obj || !symbolRef) {
-    return null;
-  }
-  const idx = obj.findSymbol(
-    symbolRef.symbolName,
-    symbolRef.sectionName ?? undefined,
-  );
-  if (idx !== undefined) {
-    return {
-      symbol: idx,
-      isMappingSymbol: false,
-    };
-  }
-  return null;
-};
-
 const App = () => {
-  const { buildRunning, result, config, ready } = useExtensionStore(
+  const {
+    buildRunning,
+    configProperties,
+    currentUnit,
+    leftStatus,
+    rightStatus,
+    leftObject,
+    rightObject,
+    config,
+    ready,
+  } = useExtensionStore(
    useShallow((state) => ({
      buildRunning: state.buildRunning,
-      result: state.result,
+      configProperties: state.configProperties,
+      currentUnit: state.currentUnit,
+      leftStatus: state.leftStatus,
+      rightStatus: state.rightStatus,
+      leftObject: state.leftObject,
+      rightObject: state.rightObject,
      config: state.projectConfig,
      ready: state.ready,
    })),
  );
-  const { leftSymbolRef, rightSymbolRef, currentView } = useAppStore(
-    useShallow((state) => ({
-      leftSymbolRef: state.leftSymbol,
-      rightSymbolRef: state.rightSymbol,
-      currentView: state.currentView,
-    })),
+  const { leftSymbolRef, rightSymbolRef, currentView, mappings } = useAppStore(
+    useShallow((state) => {
+      const unitState = state.getUnitState(currentUnit?.name ?? '');
+      return {
+        leftSymbolRef: state.leftSymbol,
+        rightSymbolRef: state.rightSymbol,
+        currentView: state.currentView,
+        mappings: unitState?.mappings,
+      };
+    }),
  );
+  const mappingConfig = useMemo(() => {
+    const result: diff.MappingConfig = {
+      mappings: mappings == null ? [] : Object.entries(mappings),
+      selectingLeft: undefined,
+      selectingRight: undefined,
+    };
+    if (leftSymbolRef && !rightSymbolRef) {
+      result.selectingRight = leftSymbolRef.symbolName;
+      result.mappings = result.mappings.filter(
+        ([left, _]) => left !== leftSymbolRef.symbolName,
+      );
+    }
+    if (!leftSymbolRef && rightSymbolRef) {
+      result.selectingLeft = rightSymbolRef.symbolName;
+      result.mappings = result.mappings.filter(
+        ([_, right]) => right !== rightSymbolRef.symbolName,
+      );
+    }
+    return result;
+  }, [leftSymbolRef, rightSymbolRef, mappings]);
+  const result = useDiff({
+    leftStatus,
+    rightStatus,
+    leftObject,
+    rightObject,
+    configProperties,
+    mappingConfig,
+  });

  if (!ready) {
    // Uses panel background color to avoid flashing
@@ -53,15 +80,19 @@ const App = () => {

  switch (currentView) {
    case 'main':
-      if (result) {
-        const leftSymbol = findSymbol(result.left, leftSymbolRef);
-        const rightSymbol = findSymbol(result.right, rightSymbolRef);
-        if (leftSymbol || rightSymbol) {
-          return (
-            <FunctionView diff={result} left={leftSymbol} right={rightSymbol} />
-          );
-        }
-        return <SymbolsView diff={result} />;
+      if (
+        result.leftStatus ||
+        result.rightStatus ||
+        result.diff.left ||
+        result.diff.right
+      ) {
+        return (
+          <DiffView
+            result={result}
+            leftSymbolRef={leftSymbolRef}
+            rightSymbolRef={rightSymbolRef}
+          />
+        );
      }

      if (buildRunning) {
@@ -23,9 +23,14 @@ export type ContextMenuState<T> = Readonly<{
  data: T;
 }>;

-type ContextMenuProps<T> = React.PropsWithChildren<{
+export type ContextMenuRender<T> = (
+  state: ContextMenuState<T>,
+  close: () => void,
+) => React.ReactNode;
+
+export type ContextMenuProps<T> = React.PropsWithChildren<{
  className?: string;
-  render?: (state: ContextMenuState<T>, close: () => void) => React.ReactNode;
+  render?: ContextMenuRender<T>;
 }>;

 export function createContextMenu<T>(): {
@@ -55,9 +60,7 @@ export function createContextMenu<T>(): {
        });
      }, []);

-      const close = useCallback(() => {
-        setState(null);
-      }, []);
+      const close = useCallback(() => setState(null), []);

      const closeIfOutside = useCallback(
        (e: Event) => {
@@ -108,9 +111,7 @@ export function createContextMenu<T>(): {
          observer.observe(state.target.parentNode, {
            childList: true,
          });
-          return () => {
-            observer.disconnect();
-          };
+          return () => observer.disconnect();
        }
      }, [state?.target, close]);

@@ -186,12 +187,8 @@ export function renderContextItems(
            className={styles.contextMenuItem}
            onClick={() => {
              navigator.clipboard.writeText(item.val.value).then(
-                () => {
-                  close();
-                },
-                (e) => {
-                  console.warn('Failed to copy:', e);
-                },
+                () => close(),
+                (e) => console.warn('Failed to copy:', e),
              );
            }}
          >
@@ -42,3 +42,8 @@
 .spacer {
  flex: 1 1 0;
 }
+
+.input {
+  display: flex;
+  align-items: center;
+}
@@ -1,9 +1,52 @@
 import styles from './TooltipShared.module.css';

 import type { display } from 'objdiff-wasm';
-import React, { useMemo } from 'react';
+import React, { useCallback, useMemo } from 'react';
 import { Tooltip } from 'react-tooltip';

+type TooltipProps = {
+  'data-tooltip-id': string;
+  'data-tooltip-content': string;
+};
+
+export type TooltipCallback<T> = (content: T) => display.HoverItem[] | null;
+
+export function createTooltip<T>(): {
+  Tooltip: React.FC<{
+    callback: TooltipCallback<T>;
+  }>;
+  useTooltip: (content: T) => TooltipProps;
+} {
+  const id = generateRandomString(10);
+  return {
+    Tooltip: ({ callback }) => {
+      const callbackMemo = useCallback(
+        (content: string) => {
+          if (!content) {
+            return null;
+          }
+          const parsedContent = JSON.parse(content) as T;
+          return callback(parsedContent);
+        },
+        [callback],
+      );
+      return <TooltipShared id={id} callback={callbackMemo} />;
+    },
+    useTooltip: (content: T) =>
+      // useMemo(
+      //   () => ({
+      //     'data-tooltip-id': id,
+      //     'data-tooltip-content': JSON.stringify(content),
+      //   }),
+      //   [content],
+      // ),
+      ({
+        'data-tooltip-id': id,
+        'data-tooltip-content': JSON.stringify(content),
+      }),
+  };
+}
+
 const TooltipShared = ({
  id,
  callback,
@@ -74,4 +117,12 @@ const TooltipContent = ({ items }: { items: display.HoverItem[] }) => {

 const TooltipContentMemo = React.memo(TooltipContent);

-export default TooltipShared;
+function generateRandomString(length: number): string {
+  const characters =
+    'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
+  let result = '';
+  for (let i = 0; i < length; i++) {
+    result += characters.charAt(Math.floor(Math.random() * characters.length));
+  }
+  return result;
+}
@@ -0,0 +1,82 @@
+import { diff } from 'objdiff-wasm';
+import { useMemo } from 'react';
+import type { ConfigProperties } from '../shared/config';
+import type { BuildStatus } from '../shared/messages';
+import { buildDiffConfig } from './state';
+
+export type DiffInput = {
+  leftStatus: BuildStatus | null;
+  rightStatus: BuildStatus | null;
+  leftObject: ArrayBuffer | null;
+  rightObject: ArrayBuffer | null;
+  configProperties: ConfigProperties;
+  mappingConfig: diff.MappingConfig;
+};
+
+export type DiffOutput = {
+  leftStatus: BuildStatus | null;
+  rightStatus: BuildStatus | null;
+  diff: diff.DiffResult | null;
+  lastBuilt: number | null;
+  isMapping: boolean;
+};
+
+export const useDiff = ({
+  leftStatus,
+  rightStatus,
+  leftObject,
+  rightObject,
+  configProperties,
+  mappingConfig,
+}: DiffInput) =>
+  useMemo(() => {
+    const start = performance.now();
+    const diffConfig = buildDiffConfig(configProperties);
+    let left: diff.Object | undefined;
+    let right: diff.Object | undefined;
+    try {
+      left =
+        leftObject?.byteLength && leftStatus?.success
+          ? diff.Object.parse(new Uint8Array(leftObject), diffConfig)
+          : undefined;
+    } catch (e) {
+      leftStatus = {
+        success: false,
+        cmdline: leftStatus?.cmdline ?? '',
+        stdout: '',
+        stderr: `Failed to parse left object: ${e}`,
+      };
+    }
+    try {
+      right =
+        rightObject?.byteLength && rightStatus?.success
+          ? diff.Object.parse(new Uint8Array(rightObject), diffConfig)
+          : undefined;
+    } catch (e) {
+      rightStatus = {
+        success: false,
+        cmdline: rightStatus?.cmdline ?? '',
+        stdout: '',
+        stderr: `Failed to parse right object: ${e}`,
+      };
+    }
+    const result = diff.runDiff(left, right, diffConfig, mappingConfig);
+    const end = performance.now();
+    console.debug('Diff time:', end - start, 'ms');
+    return {
+      leftStatus,
+      rightStatus,
+      diff: result,
+      lastBuilt: Date.now(),
+      isMapping:
+        mappingConfig.selectingLeft != null ||
+        mappingConfig.selectingRight != null,
+    };
+  }, [
+    leftStatus,
+    rightStatus,
+    leftObject,
+    rightObject,
+    configProperties,
+    mappingConfig,
+  ]);
@@ -36,6 +36,11 @@ function sendMessage(data: InboundMessage) {
 let resolvedProjectConfig: ProjectConfig | null = null;

 async function fetchFile(path: string): Promise<Response> {
+  if (!path) {
+    return Promise.resolve(
+      new Response(null, { status: 404, statusText: 'Not Found' }),
+    );
+  }
  const search = new URLSearchParams();
  search.set('path', path);
  const response = await fetch(`/api/get?${search.toString()}`);
@@ -59,6 +64,54 @@ if (serializedConfigProperties) {
  configProperties = JSON.parse(serializedConfigProperties);
 }

+async function fetchUnitFiles(unit: Unit, out: StateMessage): Promise<void> {
+  const leftPromise = fetchFile(unit.target_path ?? '')
+    .then((r) => r.arrayBuffer())
+    .then(
+      (o) => {
+        out.leftObject = o;
+        out.leftStatus = {
+          success: true,
+          cmdline: '',
+          stdout: '',
+          stderr: '',
+        };
+      },
+      (e) => {
+        out.leftObject = null;
+        out.leftStatus = {
+          success: false,
+          cmdline: '',
+          stdout: '',
+          stderr: `Failed to fetch object: ${e}`,
+        };
+      },
+    );
+  const rightPromise = fetchFile(unit.base_path ?? '')
+    .then((r) => r.arrayBuffer())
+    .then(
+      (o) => {
+        out.rightObject = o;
+        out.rightStatus = {
+          success: true,
+          cmdline: '',
+          stdout: '',
+          stderr: '',
+        };
+      },
+      (e) => {
+        out.rightObject = null;
+        out.rightStatus = {
+          success: false,
+          cmdline: '',
+          stdout: '',
+          stderr: `Failed to fetch object: ${e}`,
+        };
+      },
+    );
+  await Promise.all([leftPromise, rightPromise]);
+}
+
 async function handleMessage(msg: OutboundMessage): Promise<void> {
  switch (msg.type) {
    case 'ready': {
@@ -70,17 +123,14 @@ async function handleMessage(msg: OutboundMessage): Promise<void> {
        buildRunning: false,
        configProperties,
        currentUnit: null,
+        leftStatus: null,
+        rightStatus: null,
        leftObject: null,
        rightObject: null,
        projectConfig: resolvedProjectConfig,
      };
      if (lastUnit) {
-        out.leftObject = await fetchFile(lastUnit.target_path ?? '').then((r) =>
-          r.arrayBuffer(),
-        );
-        out.rightObject = await fetchFile(lastUnit.base_path ?? '').then((r) =>
-          r.arrayBuffer(),
-        );
+        await fetchUnitFiles(lastUnit, out);
      }
      sendMessage(out);
      break;
@@ -90,16 +140,13 @@ async function handleMessage(msg: OutboundMessage): Promise<void> {
      const out: StateMessage = {
        type: 'state',
        buildRunning: false,
+        leftStatus: null,
+        rightStatus: null,
        leftObject: null,
        rightObject: null,
      };
      if (lastUnit) {
-        out.leftObject = await fetchFile(lastUnit.target_path ?? '').then((r) =>
-          r.arrayBuffer(),
-        );
-        out.rightObject = await fetchFile(lastUnit.base_path ?? '').then((r) =>
-          r.arrayBuffer(),
-        );
+        await fetchUnitFiles(lastUnit, out);
      }
      sendMessage(out);
      break;
@@ -115,17 +162,14 @@ async function handleMessage(msg: OutboundMessage): Promise<void> {
        type: 'state',
        buildRunning: false,
        currentUnit: unit,
+        leftStatus: null,
+        rightStatus: null,
        leftObject: null,
        rightObject: null,
      };
      if (unit) {
        sendMessage({ type: 'state', buildRunning: true });
-        out.leftObject = await fetchFile(unit.target_path ?? '').then((r) =>
-          r.arrayBuffer(),
-        );
-        out.rightObject = await fetchFile(unit.base_path ?? '').then((r) =>
-          r.arrayBuffer(),
-        );
+        await fetchUnitFiles(unit, out);
      }
      lastUnit = unit;
      localStorage.setItem('lastUnit', JSON.stringify(unit));
@@ -33,20 +33,16 @@ export type SymbolRefByName = {
  sectionName: string | null;
 };

-export type UnitScrollOffsets = {
-  left: number;
-  right: number;
-};
-export type UnitCollapsedSections = {
-  left: Record<string, boolean>;
-  right: Record<string, boolean>;
-};
+export type Side = 'left' | 'right';
+export type UnitScrollOffsets = { [key in Side]: number };
+export type UnitCollapsedSections = { [key in Side]: Record<string, boolean> };

 export type UnitState = {
  scrollOffsets: UnitScrollOffsets;
  symbolScrollOffsets: Record<string, number>;
  collapsedSections: UnitCollapsedSections;
  search: string | null;
+  mappings: Record<string, string>;
 };
 const defaultUnitState: UnitState = {
  scrollOffsets: { left: 0, right: 0 },
@@ -56,6 +52,7 @@ const defaultUnitState: UnitState = {
    right: {},
  },
  search: null,
+  mappings: {},
 };

 export type CurrentView = 'main' | 'settings';
@@ -68,7 +65,7 @@ export interface AppState {
  currentView: CurrentView;
  collapsedUnits: Record<string, boolean>;

-  getUnitState(unit: string): UnitState;
+  getUnitState(unit: string | null | undefined): UnitState;
  setSelectedSymbol: (
    leftSymbol: SymbolRefByName | null,
    rightSymbol: SymbolRefByName | null,
@@ -91,6 +88,11 @@ export interface AppState {
  ) => void;
  setUnitSearch: (unit: string, search: string | null) => void;
  setUnitsScrollOffset: (offset: number) => void;
+  setUnitMapping: (
+    unit: string,
+    left: string | null | undefined,
+    right: string | null | undefined,
+  ) => void;
  setHighlight: (highlight: HighlightState) => void;
  setCurrentView: (view: CurrentView) => void;
  setCollapsedUnit: (unit: string, collapsed: boolean) => void;
@@ -123,7 +125,9 @@ export const useAppStore = create<AppState>((set) => {
    collapsedUnits: {},

    getUnitState(unit) {
-      return this.unitStates[unit] ?? defaultUnitState;
+      return unit == null
+        ? defaultUnitState
+        : (this.unitStates[unit] ?? defaultUnitState);
    },
    setSelectedSymbol: (leftSymbol, rightSymbol) =>
      set({ leftSymbol, rightSymbol }),
@@ -160,6 +164,23 @@ export const useAppStore = create<AppState>((set) => {
        search,
      })),
    setUnitsScrollOffset: (offset) => set({ unitsScrollOffset: offset }),
+    setUnitMapping: (unit, left, right) =>
+      setUnitState(unit, (state) => {
+        const newMappings = Object.fromEntries(
+          Object.entries(state.mappings || {}).filter(
+            ([k, v]) =>
+              (left == null || k !== left) && (right == null || v !== right),
+          ),
+        );
+        if (left != null && right != null && left !== right) {
+          // Only add new mapping if both sides are defined and different
+          newMappings[left] = right;
+        }
+        return {
+          ...state,
+          mappings: newMappings,
+        };
+      }),
    setHighlight: (highlight: HighlightState) => set({ highlight }),
    setCurrentView: (currentView) => set({ currentView }),
    setCollapsedUnit: (unit, collapsed) =>
@@ -178,14 +199,11 @@ export type ExtensionState = {
  currentUnit: Unit | null;
  leftStatus: BuildStatus | null;
  rightStatus: BuildStatus | null;
-  leftObject: diff.Object | null;
-  rightObject: diff.Object | null;
-  result: diff.DiffResult | null;
-  lastBuilt: number | null;
+  leftObject: ArrayBuffer | null;
+  rightObject: ArrayBuffer | null;
  projectConfig: ProjectConfig | null;
+  diffLabel: string | null;
  ready: boolean;
-
-  setResult: (result: diff.DiffResult | null | undefined) => void;
 };
 export const useExtensionStore = create(
  subscribeWithSelector<ExtensionState>((set) => ({
@@ -197,18 +215,9 @@ export const useExtensionStore = create(
    rightStatus: null,
    leftObject: null,
    rightObject: null,
-    result: null,
-    lastBuilt: null,
    projectConfig: null,
+    diffLabel: null,
    ready: false,
-
-    setResult: (result: diff.DiffResult | null | undefined) => {
-      if (result === undefined) {
-        set({ lastBuilt: Date.now() });
-      } else {
-        set({ result, lastBuilt: Date.now() });
-      }
-    },
  })),
 );

@@ -275,7 +284,8 @@ subscriptions.push(
          k !== 'setUnitsScrollOffset' &&
          k !== 'setHighlight' &&
          k !== 'setCurrentView' &&
-          k !== 'setCollapsedUnit'
+          k !== 'setCollapsedUnit' &&
+          k !== 'setUnitMapping'
        ) {
          serialized[k] = state[k] as any;
        }
@@ -330,117 +340,30 @@ export function buildDiffConfig(
  return config;
 }

-// Run diff when objects or config properties change
-subscriptions.push(
-  useExtensionStore.subscribe(
-    (state) => ({
-      leftObject: state.leftObject,
-      rightObject: state.rightObject,
-      configProperties: state.configProperties,
-      setResult: state.setResult,
-    }),
-    (
-      { leftObject, rightObject, configProperties, setResult },
-      {
-        leftObject: prevLeftObject,
-        rightObject: prevRightObject,
-        configProperties: prevConfigProperties,
-      },
-    ) => {
-      if (leftObject == null && rightObject == null) {
-        setResult(null);
-      } else if (
-        configProperties === prevConfigProperties &&
-        leftObject?.hash() === prevLeftObject?.hash() &&
-        rightObject?.hash() === prevRightObject?.hash()
-      ) {
-        // Nothing changed, but update build time
-        setResult(undefined);
-      } else {
-        const start = performance.now();
-        const diffConfig = buildDiffConfig(configProperties);
-        const result = diff.runDiff(
-          leftObject ?? undefined,
-          rightObject ?? undefined,
-          diffConfig,
-        );
-        const end = performance.now();
-        console.debug('Diff time:', end - start, 'ms');
-        setResult(result);
-      }
-    },
-    { equalityFn: shallow },
-  ),
-);
-
 const handleMessage = (event: MessageEvent) => {
  const message = event.data as InboundMessage;
  if (message.type === 'state') {
+    console.log('Received state message', message);
    const newState: Partial<ExtensionState> = {
      ...message,
-      leftObject: undefined,
-      rightObject: undefined,
-      result: undefined,
      ready: true,
    };
-    let diffConfig: diff.DiffConfig | null = null;
-    if (message.leftObject !== undefined) {
-      if (message.leftObject == null) {
-        newState.leftObject = null;
-      } else {
-        if (diffConfig == null) {
-          diffConfig = buildDiffConfig(message.configProperties);
-        }
-        try {
-          newState.leftObject = diff.Object.parse(
-            new Uint8Array(message.leftObject),
-            diffConfig,
-          );
-          newState.leftStatus = {
-            success: true,
-            cmdline: '',
-            stdout: '',
-            stderr: '',
-          };
-        } catch (e) {
-          newState.leftObject = null;
-          newState.leftStatus = {
-            success: false,
-            cmdline: '',
-            stdout: 'Failed to parse object',
-            stderr: e instanceof Error ? e.message : String(e),
-          };
-        }
-      }
+    // Backwards compatibility for decomp.me
+    if (message.leftObject && !message.leftStatus) {
+      newState.leftStatus = {
+        success: true,
+        cmdline: '',
+        stdout: '',
+        stderr: '',
+      };
    }
-    if (message.rightObject !== undefined) {
-      if (message.rightObject == null) {
-        newState.rightObject = null;
-      } else {
-        if (diffConfig == null) {
-          diffConfig = buildDiffConfig(message.configProperties);
-        }
-        try {
-          newState.rightObject = diff.Object.parse(
-            new Uint8Array(message.rightObject),
-            diffConfig,
-          );
-          newState.rightStatus = {
-            success: true,
-            cmdline: '',
-            stdout: '',
-            stderr: '',
-          };
-        } catch (e) {
-          newState.rightObject = null;
-          newState.rightStatus = {
-            success: false,
-            cmdline: '',
-            stdout: 'Failed to parse object',
-            stderr: e instanceof Error ? e.message : String(e),
-          };
-        }
-      }
+    if (message.rightObject && !message.rightStatus) {
+      newState.rightStatus = {
+        success: true,
+        cmdline: '',
+        stdout: '',
+        stderr: '',
+      };
    }
    for (const k in newState) {
      const key = k as keyof typeof newState;
@@ -0,0 +1,23 @@
+.content {
+  flex: 1 1 0;
+  display: flex;
+  flex-flow: row;
+}
+
+.column {
+  flex: 1 1 0;
+  margin: 0;
+  padding: 0;
+  overflow: auto;
+}
+
+.no-object {
+  color: var(--color-blue);
+
+  font-family: var(--code-font-family);
+  font-weight: var(--code-font-weight);
+  font-size: var(--code-font-size);
+  font-variant-ligatures: var(--code-font-variant-ligatures);
+  text-wrap: nowrap;
+  white-space: pre;
+}
@@ -5,8 +5,6 @@
 .instruction-row {
  display: flex;
  flex-direction: row;
-  gap: 0.5em;
-  height: var(--list-row-height);
 }

 .instruction-cell {
@@ -4,26 +4,20 @@ import styles from './FunctionView.module.css';
 import clsx from 'clsx';
 import memoizeOne from 'memoize-one';
 import { type diff, display } from 'objdiff-wasm';
-import { memo, useMemo } from 'react';
-import AutoSizer from 'react-virtualized-auto-sizer';
+import { memo, useCallback, useMemo } from 'react';
 import { FixedSizeList, areEqual } from 'react-window';
 import type { ListChildComponentProps } from 'react-window';
 import { useShallow } from 'zustand/react/shallow';
 import { createContextMenu, renderContextItems } from '../common/ContextMenu';
-import TooltipShared from '../common/TooltipShared';
-import {
-  buildDiffConfig,
-  runBuild,
-  useAppStore,
-  useExtensionStore,
-} from '../state';
+import { createTooltip } from '../common/TooltipShared';
+import { buildDiffConfig, useAppStore, useExtensionStore } from '../state';
 import {
  type HighlightState,
  highlightColumn,
  highlightMatches,
  updateHighlight,
 } from '../util/highlight';
-import { percentClass, useFontSize } from '../util/util';
+import { useFontSize } from '../util/util';

 const ROTATION_CLASSES = [
  styles.rotation0,
@@ -37,10 +31,20 @@ const ROTATION_CLASSES = [
  styles.rotation8,
 ];

-const { ContextMenuProvider, useContextMenu } = createContextMenu<{
+export type InstructionTooltipContent = {
  column: number;
  row: number;
-}>();
+};
+
+export const {
+  Tooltip: InstructionTooltip,
+  useTooltip: useInstructionTooltip,
+} = createTooltip<InstructionTooltipContent>();
+
+export const {
+  ContextMenuProvider: InstructionContextMenuProvider,
+  useContextMenu: useInstructionContextMenu,
+} = createContextMenu<InstructionTooltipContent>();

 const AsmCell = ({
  obj,
@@ -53,15 +57,28 @@ const AsmCell = ({
 }: {
  obj: diff.ObjectDiff | undefined;
  config: diff.DiffConfig;
-  symbol: display.SectionDisplaySymbol | null;
+  symbol: display.SymbolRef | null;
  row: number;
  column: number;
  highlight: HighlightState;
  setHighlight: (highlight: HighlightState) => void;
 }) => {
-  const onContextMenu = useContextMenu();
+  const onContextMenu = useInstructionContextMenu();
+  const tooltipContent: InstructionTooltipContent = useMemo(
+    () => ({
+      column,
+      row,
+    }),
+    [column, row],
+  );
+  const tooltipProps = useInstructionTooltip(tooltipContent);
+  const onContextMenuMemo = useCallback(
+    (e: React.MouseEvent<HTMLElement>) => onContextMenu(e, tooltipContent),
+    [onContextMenu, tooltipContent],
+  );
+
  if (!obj || !symbol) {
-    return <div className={styles.instructionCell} />;
+    return null;
  }

  const highlight = highlightColumn(highlightState, column);
@@ -198,33 +215,24 @@ const AsmCell = ({
    return <div className={clsx(classes)} />;
  }

-  const tooltipContent: InstructionTooltipContent = { column, row };
  return (
    <div
      className={clsx(classes)}
-      data-tooltip-id="instruction-tooltip"
-      data-tooltip-content={JSON.stringify(tooltipContent)}
-      onContextMenu={(e) => onContextMenu(e, { column, row })}
+      onContextMenu={onContextMenuMemo}
+      {...tooltipProps}
    >
      {out}
    </div>
  );
 };

-type InstructionTooltipContent = {
-  column: number;
-  row: number;
-};
-
 type ItemData = {
  itemCount: number;
  symbolName: string;
  result: diff.DiffResult;
  config: diff.DiffConfig;
  matchPercent?: number;
-  left: display.SectionDisplaySymbol | null;
  leftSymbol: display.SymbolDisplay | null;
-  right: display.SectionDisplaySymbol | null;
  rightSymbol: display.SymbolDisplay | null;
  highlight: HighlightState;
  setHighlight: (highlight: HighlightState) => void;
@@ -234,7 +242,7 @@ const AsmRow = memo(
  ({
    index,
    style,
-    data: { result, config, left, right, highlight, setHighlight },
+    data: { result, config, leftSymbol, rightSymbol, highlight, setHighlight },
  }: ListChildComponentProps<ItemData>) => {
    return (
      <div
@@ -254,7 +262,7 @@ const AsmRow = memo(
        <AsmCell
          obj={result.left}
          config={config}
-          symbol={left}
+          symbol={leftSymbol?.info.id ?? null}
          row={index}
          column={0}
          highlight={highlight}
@@ -263,7 +271,7 @@ const AsmRow = memo(
        <AsmCell
          obj={result.right}
          config={config}
-          symbol={right}
+          symbol={rightSymbol?.info.id ?? null}
          row={index}
          column={1}
          highlight={highlight}
@@ -278,20 +286,16 @@ const AsmRow = memo(
 const createItemData = memoizeOne(
  (
    result: diff.DiffResult,
-    left: display.SectionDisplaySymbol | null,
-    right: display.SectionDisplaySymbol | null,
+    leftSymbol: display.SymbolDisplay | null,
+    rightSymbol: display.SymbolDisplay | null,
    highlight: HighlightState,
    setHighlight: (highlight: HighlightState) => void,
  ): ItemData => {
-    const leftSymbol = left ? display.displaySymbol(result.left!, left) : null;
-    const rightSymbol = right
-      ? display.displaySymbol(result.right!, right)
-      : null;
    const itemCount = Math.max(
      leftSymbol?.rowCount || 0,
      rightSymbol?.rowCount || 0,
    );
-    const symbolName = leftSymbol?.name || rightSymbol?.name || '';
+    const symbolName = leftSymbol?.info.name || rightSymbol?.info.name || '';
    const config = buildDiffConfig(null);
    const matchPercent = rightSymbol?.matchPercent;
    return {
@@ -300,9 +304,7 @@ const createItemData = memoizeOne(
      result,
      config,
      matchPercent,
-      left,
      leftSymbol,
-      right,
      rightSymbol,
      highlight,
      setHighlight,
@@ -322,7 +324,7 @@ const SymbolLabel = ({
      </span>
    );
  }
-  const displayName = symbol.demangledName || symbol.name;
+  const displayName = symbol.info.demangledName || symbol.info.name;
  return (
    <span
      className={clsx(headerStyles.label, headerStyles.emphasized)}
@@ -333,36 +335,35 @@ const SymbolLabel = ({
  );
 };

-const FunctionView = ({
+export const InstructionList = ({
+  height,
+  width,
  diff,
-  left,
-  right,
+  leftSymbol,
+  rightSymbol,
 }: {
+  height: number;
+  width: number;
  diff: diff.DiffResult;
-  left: display.SectionDisplaySymbol | null;
-  right: display.SectionDisplaySymbol | null;
+  leftSymbol: display.SymbolDisplay | null;
+  rightSymbol: display.SymbolDisplay | null;
 }) => {
-  const { buildRunning, currentUnit, lastBuilt, hasProjectConfig } =
-    useExtensionStore(
-      useShallow((state) => ({
-        buildRunning: state.buildRunning,
-        currentUnit: state.currentUnit,
-        lastBuilt: state.lastBuilt,
-        hasProjectConfig: state.projectConfig != null,
-      })),
-    );
+  const currentUnit = useExtensionStore((state) => state.currentUnit);
+  const { highlight, setSymbolScrollOffset, setHighlight } = useAppStore(
+    useShallow((state) => ({
+      highlight: state.highlight,
+      setSymbolScrollOffset: state.setSymbolScrollOffset,
+      setHighlight: state.setHighlight,
+    })),
+  );
+  const itemData = createItemData(
+    diff,
+    leftSymbol,
+    rightSymbol,
+    highlight,
+    setHighlight,
+  );
  const currentUnitName = currentUnit?.name || '';
-  const { highlight, setSelectedSymbol, setSymbolScrollOffset, setHighlight } =
-    useAppStore(
-      useShallow((state) => ({
-        highlight: state.highlight,
-        setSelectedSymbol: state.setSelectedSymbol,
-        setSymbolScrollOffset: state.setSymbolScrollOffset,
-        setHighlight: state.setHighlight,
-      })),
-    );
-
-  const itemData = createItemData(diff, left, right, highlight, setHighlight);
  const initialScrollOffset = useMemo(
    () =>
      useAppStore.getState().getUnitState(currentUnitName).symbolScrollOffsets[
@@ -370,140 +371,25 @@ const FunctionView = ({
      ] || 0,
    [currentUnitName, itemData.symbolName],
  );
-
  const itemSize = useFontSize() * 1.33;
  return (
-    <>
-      <div className={headerStyles.header}>
-        <div className={headerStyles.column}>
-          <div className={headerStyles.row}>
-            <button title="Back" onClick={() => setSelectedSymbol(null, null)}>
-              <span className="codicon codicon-chevron-left" />
-            </button>
-          </div>
-          <div className={headerStyles.row}>
-            <SymbolLabel symbol={itemData.leftSymbol} />
-          </div>
-        </div>
-        <div className={headerStyles.column}>
-          <div className={headerStyles.row}>
-            {hasProjectConfig && (
-              <button
-                title="Build"
-                onClick={() => runBuild()}
-                disabled={buildRunning}
-              >
-                <span className="codicon codicon-refresh" />
-              </button>
-            )}
-            {lastBuilt && (
-              <span className={headerStyles.label}>
-                Last built: {new Date(lastBuilt).toLocaleTimeString('en-US')}
-              </span>
-            )}
-          </div>
-          <div className={headerStyles.row}>
-            {itemData.matchPercent !== undefined && (
-              <>
-                <span
-                  className={clsx(
-                    headerStyles.label,
-                    percentClass(itemData.matchPercent),
-                  )}
-                >
-                  {Math.floor(itemData.matchPercent).toFixed(0)}%
-                </span>
-                {' | '}
-              </>
-            )}
-            <SymbolLabel symbol={itemData.rightSymbol} />
-          </div>
-        </div>
-      </div>
-      <div className={styles.instructionList}>
-        <ContextMenuProvider
-          render={({ data }, close) => {
-            let obj: diff.ObjectDiff | undefined;
-            let symbol: display.SectionDisplaySymbol | undefined;
-            switch (data.column) {
-              case 0:
-                obj = diff.left;
-                symbol = itemData.left ?? undefined;
-                break;
-              case 1:
-                obj = diff.right;
-                symbol = itemData.right ?? undefined;
-                break;
-              default:
-                break;
-            }
-            if (!obj || !symbol) {
-              return null;
-            }
-            const items = display.instructionContext(
-              obj,
-              symbol,
-              data.row,
-              itemData.config,
-            );
-            return renderContextItems(items, close);
-          }}
-        >
-          <AutoSizer>
-            {({ height, width }) => (
-              <FixedSizeList
-                height={height}
-                itemCount={itemData.itemCount}
-                itemSize={itemSize}
-                width={width}
-                itemData={itemData}
-                overscanCount={20}
-                onScroll={(e) => {
-                  setSymbolScrollOffset(
-                    currentUnitName,
-                    itemData.symbolName,
-                    e.scrollOffset,
-                  );
-                }}
-                initialScrollOffset={initialScrollOffset}
-              >
-                {AsmRow}
-              </FixedSizeList>
-            )}
-          </AutoSizer>
-        </ContextMenuProvider>
-      </div>
-      <TooltipShared
-        id="instruction-tooltip"
-        callback={(content) => {
-          const data: InstructionTooltipContent = JSON.parse(content);
-          let obj: diff.ObjectDiff | undefined;
-          let symbol: display.SectionDisplaySymbol | undefined;
-          switch (data.column) {
-            case 0:
-              obj = diff.left;
-              symbol = itemData.left ?? undefined;
-              break;
-            case 1:
-              obj = diff.right;
-              symbol = itemData.right ?? undefined;
-              break;
-            default:
-              break;
-          }
-          if (!obj || !symbol) {
-            return null;
-          }
-          return display.instructionHover(
-            obj,
-            symbol,
-            data.row,
-            itemData.config,
-          );
-        }}
-      />
-    </>
+    <FixedSizeList
+      height={height}
+      itemCount={itemData.itemCount}
+      itemSize={itemSize}
+      width={width}
+      itemData={itemData}
+      overscanCount={20}
+      onScroll={(e) => {
+        setSymbolScrollOffset(
+          currentUnitName,
+          itemData.symbolName,
+          e.scrollOffset,
+        );
+      }}
+      initialScrollOffset={initialScrollOffset}
+    >
+      {AsmRow}
+    </FixedSizeList>
  );
 };
-
-export default FunctionView;
@@ -11,41 +11,6 @@
  padding: 0;
 }

-.symbol-list-row {
-  cursor: pointer;
-  user-select: none;
-  height: var(--list-row-height);
-
-  font-family: var(--code-font-family);
-  font-weight: var(--code-font-weight);
-  font-size: var(--code-font-size);
-  font-variant-ligatures: var(--code-font-variant-ligatures);
-  text-wrap: nowrap;
-  white-space: pre;
-
-  &:hover {
-    background-color: var(--list-row-hover-background);
-  }
-}
-
-.section {
-  padding-left: 0.5em;
-
-  &::before {
-    content: "▼ ";
-  }
-  &.collapsed {
-    opacity: 0.75;
-    &::before {
-      content: "▶ ";
-    }
-  }
-}
-
-.symbol {
-  padding-left: 2em;
-}
-
 .flag-local {
  color: inherit;
 }
@@ -62,6 +27,10 @@
  color: var(--color-blue);
 }

+.flag-hidden {
+  color: var(--color-muted);
+}
+
 .symbol-name {
  color: var(--color-bright);
 }
@@ -76,3 +45,19 @@
  text-wrap: nowrap;
  white-space: pre;
 }
+
+.selected {
+  background-color: var(--list-row-selection-background) !important;
+}
+
+.highlighted {
+  background-color: var(--list-row-highlight-background) !important;
+}
+
+.selected.highlighted {
+  background-color: color-mix(
+    in srgb,
+    var(--list-row-selection-background) 50%,
+    var(--list-row-highlight-background) 50%
+  ) !important;
+}
@@ -0,0 +1,42 @@
+.row {
+  display: flex;
+  cursor: pointer;
+  user-select: none;
+  height: var(--list-row-height);
+  padding-left: 0.5em;
+
+  font-family: var(--code-font-family);
+  font-weight: var(--code-font-weight);
+  font-size: var(--code-font-size);
+  font-variant-ligatures: var(--code-font-variant-ligatures);
+  text-wrap: nowrap;
+  white-space: pre;
+
+  &:hover {
+    background-color: var(--list-row-hover-background);
+  }
+}
+
+.indent {
+  display: inline-block;
+  height: var(--list-row-height);
+  width: 0;
+  border-right: 1px solid var(--panel-separator);
+  margin-left: 0.5em;
+  margin-right: 0.5em;
+}
+
+.indent-highlighted {
+  border-right-color: var(--color-muted);
+}
+
+.toggle {
+  display: inline-block;
+  height: var(--list-row-height);
+  width: 1em;
+  margin-right: 0.25em;
+}
+
+.collapsed {
+  color: color-mix(in srgb, var(--foreground) 75%, transparent);
+}
@@ -0,0 +1,215 @@
+import clsx from 'clsx';
+import type { ListChildComponentProps } from 'react-window';
+import styles from './TreeView.module.css';
+
+export type NodeInner<T> = {
+  id: string;
+  indent: number;
+  path: string[];
+  data: T;
+};
+
+export type BranchNode<T> = NodeInner<T> & {
+  type: 'branch';
+  collapsed: boolean;
+};
+
+export type LeafNode<T> = NodeInner<T> & {
+  type: 'leaf';
+};
+
+export type Node<B, L> = BranchNode<B> | LeafNode<L>;
+
+export type TreeData<B, L> = {
+  leafCount: number;
+  nodes: Node<B, L>[];
+  highlightedPath: string | null;
+  setHighlightedPath: (id: string | null) => void;
+};
+
+export type TreeRowProps<B, L> = ListChildComponentProps<TreeData<B, L>> & {
+  rowProps?: React.HTMLProps<HTMLDivElement> | null;
+  render: (item: Node<B, L>) => React.ReactNode;
+  getClasses?: (item: Node<B, L>) => string[];
+  onLeafClick?: (item: LeafNode<L>) => void;
+  onHover?: (item: Node<B, L>) => void;
+  setBranchCollapsed?: (id: string, collapsed: boolean) => void;
+};
+
+export function TreeRow<B, L>({
+  index,
+  style,
+  data: { nodes, highlightedPath, setHighlightedPath },
+  rowProps,
+  render,
+  getClasses,
+  onLeafClick,
+  onHover,
+  setBranchCollapsed,
+}: TreeRowProps<B, L>) {
+  const node = nodes[index];
+  const classes = [styles.row];
+  if (node.type === 'branch' && node.collapsed) {
+    classes.push(styles.collapsed);
+  }
+  classes.push(...(getClasses?.(node) ?? []));
+  const indentItems = [];
+  for (let i = 0; i < node.indent; i++) {
+    indentItems.push(
+      <span
+        key={i}
+        className={clsx(
+          styles.indent,
+          node.path[i] === highlightedPath && styles.indentHighlighted,
+        )}
+      />,
+    );
+  }
+  if (node.type === 'branch') {
+    indentItems.push(
+      <span
+        key="toggle"
+        className={clsx(
+          styles.toggle,
+          'codicon',
+          node.collapsed ? 'codicon-chevron-right' : 'codicon-chevron-down',
+        )}
+      />,
+    );
+  }
+  return (
+    <div
+      className={clsx(classes)}
+      style={style}
+      {...rowProps}
+      onClick={() => {
+        if (node.type === 'leaf') {
+          onLeafClick?.(node);
+        } else {
+          const collapsed = !node.collapsed;
+          setBranchCollapsed?.(node.id, collapsed);
+          setHighlightedPath(
+            collapsed ? node.path[node.path.length - 1] : node.id,
+          );
+        }
+      }}
+      onMouseEnter={() => {
+        onHover?.(node);
+        setHighlightedPath(
+          node.type === 'leaf' || node.collapsed
+            ? node.path[node.path.length - 1]
+            : node.id,
+        );
+      }}
+    >
+      {indentItems}
+      {render(node)}
+    </div>
+  );
+}
+
+type NodeWithChildren<B, L> = BranchNode<B> & {
+  children: (NodeWithChildren<B, L> | LeafNode<L>)[];
+};
+
+export type SimpleTreeNodeData = { label: string };
+export type SimpleTreeData<L> = TreeData<
+  SimpleTreeNodeData,
+  L & SimpleTreeNodeData
+>;
+
+// Build a simple tree structure by splitting the path of each item
+// into components (splitting on '/') and creating a tree node for
+// each component.
+export function buildSimpleTree<L>(
+  items: L[],
+  getPath: (item: L) => string,
+  collapsed: Record<string, boolean>,
+  highlightedPath: string | null,
+  setHighlightedPath: (id: string | null) => void,
+): SimpleTreeData<L> {
+  type SimpleTreeNode = NodeWithChildren<
+    SimpleTreeNodeData,
+    L & SimpleTreeNodeData
+  >;
+  const map = new Map<string, SimpleTreeNode>();
+  const rootNodes = [];
+  for (const item of items) {
+    const path = getPath(item);
+    const split = path.split('/');
+    let parent: SimpleTreeNode | null = null;
+    for (let i = 0; i < split.length - 1; i++) {
+      const name = split[i];
+      const dirPath = split.slice(0, i + 1);
+      const key = dirPath.join('/');
+      let node = map.get(key);
+      if (!node) {
+        node = {
+          type: 'branch',
+          id: key,
+          indent: i,
+          collapsed: !!collapsed[key],
+          children: [],
+          path: buildPath(dirPath),
+          data: { label: name },
+        };
+        if (parent) {
+          parent.children.push(node);
+        } else {
+          rootNodes.push(node);
+        }
+        map.set(key, node);
+      }
+      parent = node;
+    }
+    const node: LeafNode<L & SimpleTreeNodeData> = {
+      type: 'leaf',
+      id: path,
+      indent: split.length - 1,
+      path: buildPath(split),
+      data: {
+        ...item,
+        label: split[split.length - 1],
+      },
+    };
+    if (parent) {
+      parent.children.push(node);
+    } else {
+      rootNodes.push(node);
+    }
+  }
+  const nodes: SimpleTreeData<L>['nodes'] = [];
+  for (const node of rootNodes) {
+    pushNodes(node, nodes);
+  }
+  return {
+    leafCount: items.length,
+    nodes,
+    highlightedPath,
+    setHighlightedPath,
+  };
+}
+
+function pushNodes<B, L>(
+  item: NodeWithChildren<B, L> | LeafNode<L>,
+  out: Node<B, L>[],
+) {
+  if (item.type === 'branch') {
+    out.push(item);
+    if (!item.collapsed) {
+      for (const child of item.children) {
+        pushNodes(child, out);
+      }
+    }
+  } else if (item.type === 'leaf') {
+    out.push(item);
+  }
+}
+
+function buildPath(split: string[]) {
+  const path = [];
+  for (let i = 0; i < split.length - 1; i++) {
+    path.push(split.slice(0, i + 1).join('/'));
+  }
+  return path;
+}
--- a/Show More
+++ b/Show More