Group iOS treemap by known libraries

[trevor-e]

The iOS main-binary treemap breaks the executable into per-Swift-module and per-ObjC-class nodes, all flat alongside segments/metadata — with no way to tell the app's own code apart from statically-linked third-party SDKs. This is the iOS analog of EME-108 (group dex by known libraries).

This adds a curated catalog of well-known iOS libraries (known_libraries.py) keyed by Swift module name and distinctive ObjC class prefixes (Sentry, Firebase, Alamofire, Lottie, GoogleMaps, Realm, etc.). In MachOElementBuilder, recognized module/class nodes are pulled out and grouped under a single Libraries node; the app's own modules stay as direct children. Sizes are preserved (nodes are only re-parented), so the existing size-accounting check still holds, and no new TreemapType/frontend changes are needed.

Example:

MainBinary
├─ Libraries
│  ├─ Firebase        ← FirebaseCore + FirebaseAnalytics
│  ├─ Sentry
│  └─ Alamofire
├─ MyApp              ← first-party module, stays flat
├─ __TEXT, __DATA …

The catalog is intentionally conservative and easy to extend.

Testing

• New unit tests for resolve_known_library and for the grouping behavior (Swift-module breakdown depends on the macOS-only cwl-demangle, so grouping is unit-tested with synthetic symbol data rather than via the Darwin-only integration tests).
• make check passes (lint/format/types).

[linear-code]

EME-139

[sentry]

📲 Install Builds

iOS

🔗 App Name	App ID	Version	Configuration
HackerNews	com.emergetools.hackernews	3.8 (1)	Release

Android

🔗 App Name	App ID	Version	Configuration
Hacker News	com.emergetools.hackernews	1.0.2 (13)	Release

⚙️ launchpad-test-android Build Distribution Settings

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[cursor]

Prefix matching mislabels modules

Medium Severity

resolve_known_library runs Objective-C prefix checks on every symbol child name, including Swift module nodes, so first-party modules that only share a prefix (for example Branch or SentryUI) can be grouped under third-party Libraries. The Datadog DD prefix is two characters and matches unrelated ObjC types such as CocoaLumberjack’s DDLog, despite the catalog comment requiring 3+ character prefixes.

Additional Locations (1)

• src/launchpad/size/treemap/macho_element_builder.py#L190-L196

 

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