rb2-class

name: rb2-class description: Get class layout from RB2 DWARF debug info. Shows member offsets, sizes, types, and inheritance. Ground truth for struct layouts when DC3 headers lack offset information. argument-hint: "[class-name] [offset]" allowed-tools: Bash(python3 -c *), Read, Grep, Glob

RB2 Class Info Skill

Query the RB2 DWARF dump for class layout ground truth.

Arguments

$ARGUMENTS - Class name (e.g., Character, RndDir). Optional offset to look up a specific member.

Steps

1. Parse the arguments. $0 is a class name. Optional $1 is an offset.

2. If an offset is given, look up the specific member:

   python3 -c "
   import sys
   sys.path.insert(0, 'scripts')
   from orchestrator.rb2_dwarf import RB2DwarfParser, DEFAULT_RB2_DUMP
   
   parser = RB2DwarfParser(DEFAULT_RB2_DUMP)
   result = parser.get_member_at_offset('$0', $1)
   if result:
       print(f\"{result['class']}::{result['member']}\")
       print(f\"  Type: {result['type']}\")
       print(f\"  Offset: 0x{result['offset']:x}\")
       print(f\"  Size: {result['size']} bytes\")
   else:
       print(f'No member at offset $1 in $0')
   "
   

3. Otherwise, show full class layout:

   python3 -c "
   import sys
   sys.path.insert(0, 'scripts')
   from orchestrator.rb2_dwarf import RB2DwarfParser, DEFAULT_RB2_DUMP
   
   parser = RB2DwarfParser(DEFAULT_RB2_DUMP)
   info = parser.get_class('$0')
   if not info:
       similar = parser.search_classes('$0')[:10]
       if similar:
           print(f\"Class '$0' not found. Similar:\")
           for c in similar:
               print(f'  - {c}')
       else:
           print(f\"Class '$0' not found in RB2 DWARF\")
   else:
       print(f\"{info['kind']} {info['name']} (RB2 DWARF)\")
       print(f\"Size: 0x{info['total_size']:x} ({info['total_size']} bytes)\")
       if info['parents']:
           print(f\"Parents: {', '.join(info['parents'])}\")
       chain = parser.get_inheritance_chain('$0')
       if len(chain) > 1:
           print(f\"Chain: {' -> '.join(chain)}\")
       if info['members']:
           print()
           print(f\"{'Offset':<10} {'Size':<8} {'Type':<30} Name\")
           print('-' * 80)
           for m in info['members']:
               print(f\"0x{m['offset']:<8x} 0x{m['size']:<6x} {m['type']:<30} {m['name']}\")
   "
   

4. Present the results clearly, noting any differences from DC3 headers.

Tips

• RB2 DWARF is ground truth for shared Milo engine classes (offset-accurate)
• DC3 may have additional members not in RB2 — compare carefully
• DWARF dump is at ~/code/milohax/rb3/doc/rb2_dump.cpp
• Use alongside /struct-info (DC3 headers) and /ghidra-struct (binary analysis) for three-way comparison