bug: No Objective-C support

[IronMan-2026]

What happened?

Title

No Objective-C support — all .m/.mm files produce empty summaries ("contains 0 function definitions")

Labels

bug, enhancement, language-support

Body

Description

Objective-C (.m) and Objective-C++ (.mm) files are not supported. The project scanner detects them by extension (language: "m"), but no Tree-sitter grammar or language config exists for them. As a result, the file-analyzer LLM subagent receives no structural information (functions, classes, methods) and falls back to a generic template summary.
This is a critical gap for any iOS project — Objective-C is the primary language for a large portion of the iOS ecosystem.

Steps to Reproduce

1. Run /understand on any iOS project containing .m or .mm files
2. Open the generated knowledge-graph.json
3. Search for "contains 0 function" (or localized equivalent) in the summary field

Expected Behavior

• .m files should be parsed like other source files
• Functions, classes (@interface/@implementation), methods, and properties should be extracted
• Summaries should describe the actual business logic, not just the module name + file type

Actual Behavior

100% of .m and .mm files produce empty summaries:

File extension	Result
.m	All files report "0 function definitions"
.mm	All files report "0 function definitions"
The only .m files that get meaningful summaries are main.m and AppDelegate.m — the LLM recognizes them as entry points without needing structural extraction.
Example of degraded output:

{
  "id": "file:path/to/SomeManager.m",
  "type": "file",
  "name": "SomeManager.m",
  "summary": "SomeModule module implementation file, containing 0 function definitions.",
  "tags": ["implementation"],
  "complexity": "complex"
}
A 1000+ line core class with dozens of methods — but the graph knows nothing about it.
Root Cause
1. packages/core/src/languages/configs/ contains no objectivec.ts (or objc.ts)
2. No tree-sitter-objc WASM grammar is bundled
3. No ObjC language extractor exists (no @interface/@implementation parsing)
4. The scanner classifies .m files as language: "m" instead of mapping to a known language config
5. Without structural extraction, the LLM file-analyzer subagent has no input context and generates a template summary
Impact
- The knowledge graph is effectively useless for iOS projects — the primary language is unsupported
- /understand-chat cannot answer questions about business logic because core classes have no semantic information in the graph
- A significant portion of all nodes in any iOS project's graph will be degraded
Suggested Fix
1. Add objectivec.ts language config in packages/core/src/languages/configs/
   - Extensions: .m, .h (when in ObjC context)
   - Tree-sitter grammar: tree-sitter-objc (https://github.com/tree-sitter-grammars/tree-sitter-objc)
2. Bundle tree-sitter-objc.wasm
3. Create an ObjC language extractor that handles:
   - @interface / @implementation → classes
   - - (void)methodName: / + (instancetype)sharedInstance → methods/functions
   - @property → properties
   - #import → imports
4. Map .m extension to objective-c in the scanner

### Minimal reproduction

_No response_

### Plugin version

2.7.4

### Platform / client

opencode

### OS + Node version

macOS arm64

### Primary language of the analyzed project

_No response_

### Approximate file count of the analyzed project

_No response_

### Relevant logs

```shell

[VBS2004]

A comprehensive fix for this has been implemented and submitted in PR #556

The PR addresses all the root causes identified in this issue:

Language Config: Added the objectivec.ts language config and registered it to correctly identify .m and .mm files.
Structural Extraction: Built a full ObjcExtractor powered by tree-sitter-objc to provide structural context to the LLM. It accurately extracts:
Classes (merging @interface and @implementation)
Protocols (@protocol)
Properties (@Property)
Instance and class methods (including multi-part selectors)
Imports (#import / #include)
Call graphs for both message sends ([recv selector:arg]) and C-style calls (NSLog, dispatch_*).
Scanner Mapping: Updated scan-project.mjs to properly map .m and .mm file extensions to the new objective-c language profile.
Dependencies & Tests: Bundled the tree-sitter-objc@3.0.2 grammar and added 51 tests across 4 suites (unit, regression, registry, and C++ compat), validated against 7 real iOS project fixtures covering typical patterns.
With these changes, the file-analyzer will now receive the proper structural context, and the knowledge graph will generate highly accurate summaries and call graphs for iOS projects instead of the generic fallback.