[CORE] Rule G015: Automated AST Storage Slot Re-Ordering Transformer

[mijinummi]

Labels: high-difficulty, rust, ast, gasguard
Difficulty: High
Module: gasguard-cli/src/transformers/

---

🧠 Concept

Develop an automated refactoring command in the GasGuard CLI that parses contract ASTs, detects un-packed storage variables, and automatically reorders variable declarations to minimize storage slot usage.

⚠️ Problem

Manually reordering state variables to optimize storage layout across large codebases is time-consuming and prone to human error.

📁 Implementation Scope

• gasguard-cli/src/transformers/storage_packer.rs
• gasguard-cli/test/fixtures/storage_packing_transform.sol

🛠️ Requirements

1. Calculate bit sizes for state variables declared in target contract ASTs.
2. Group sub-32-byte variables together sequentially to fill 256-bit slots.
3. Output updated Solidity contract source code while preserving inline comments and code formatting.

🎯 Acceptance Criteria

• Reorders state variable declarations to achieve minimal storage slot usage.
• Reordered output code compiles cleanly and passes unit tests.

[tecmalik]

@tecmalik has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

please assign this issue to me i wouldlove to work on it

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[quickweb-stack]

@quickweb-stack has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I've reviewed the task and have a clear implementation plan. Looking forward to contributing with a quality PR.

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[Danielobito009]

@Danielobito009 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I would love to work on this issue

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[zoffunjunior381-jpg]

@zoffunjunior381-jpg has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

What can I do for you to assign me this issue sir? I assure you completion of the issue on time with expected output.

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[drips-wave]

Congratulations, @zoffunjunior381-jpg! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

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