il2cpp: constant recovery, decomp cleaning & symbol suggestion for Ghidra RE - #13
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… for Ghidra RE Adds a decompile-time RE layer on top of the existing Il2CppDumper-compatible package, ported from standalone Python helpers into the C# toolchain (CLI + MCP): - Il2CppConstantResolver / BinaryImage: decode packed float/double/int immediates Ghidra shows as raw hex (0x3f19999a3e99999a -> (0.3f, 0.6f)), and resolve DAT_<va> literal-pool loads by mapping VA -> file offset (PE and ELF, 32/64-bit). - Il2CppDecompCleaner: strip IL2CPP boilerplate (class-init guards, metadata-init thunks, ctor scaffolding, empty decls) by shape (survives a rebased binary) and annotate hidden constants inline. - Il2CppSymbolIndex: fuzzy name matching + Suggest() to map a feature/keywords (or a script file) to ranked Type$$ symbols worth decompiling. CLI (-m il2cpp): --il2cpp-decode, --il2cpp-data, --il2cpp-clean [--il2cpp-clean-raw], --il2cpp-suggest, --il2cpp-fuzzy (also applies to --il2cpp-lookup). MCP: il2cpp_decode, il2cpp_data, il2cpp_clean, il2cpp_suggest tools; use_fuzzy on il2cpp_lookup. Docs updated. Co-Authored-By: Clue <noreply@anthropic.com>
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What
Adds a decompile-time reverse-engineering layer on top of the existing Il2CppDumper-compatible Ghidra package. Ported three standalone Python helpers into the C# toolchain so they run in one place (CLI
-m il2cpp+ MCP), reusingIl2CppSymbolIndexand the game's resolved binary.Why
The existing exporter produces the static package (types, structs, symbols). What was missing is the iterative layer you actually use while decompiling in Ghidra: recovering the constants Ghidra hides as raw hex, cutting the IL2CPP boilerplate out of a function, and finding which symbols to look at. These fill that gap.
Changes
1. Constant recovery —
Il2CppConstantResolver.cs(new)0x3f19999a3e99999a→(0.3f, 0.6f);0x3f800000→1.0f).BinaryImage: VA→file-offset mapper readingDAT_<va>literal-pool loads — PE and ELF, 32/64-bit (the original Python was ELF64-only).--il2cpp-decode,--il2cpp-data; MCPil2cpp_decode,il2cpp_data.2. Decomp cleaner —
Il2CppDecompCleaner.cs(new)--il2cpp-clean [--il2cpp-clean-raw]; MCPil2cpp_clean.3. Fuzzy search / suggest —
Il2CppSymbolIndex.csRatio(Levenshtein),KeywordsFromText,Suggest(), and afuzzymode folded into the existingFindByNameso it enhancesil2cpp_lookuprather than duplicating it.--il2cpp-suggest,--il2cpp-fuzzy; MCPil2cpp_suggest+use_fuzzyonil2cpp_lookup.Docs updated (main README,
tools/mcp/README.md); MCP server bumped to 0.5.0.Notes for reviewer
UnityRiftFBXNative.dllpost-build copy step, so runnable binaries come from CI.(0.3f, 0.6f),1.0f).