forked from DecentralizedClimateFoundation/DCIPs
69 lines
2.8 KiB
Markdown
69 lines
2.8 KiB
Markdown
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---
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eip: 3322
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title: Account gas storage opcodes
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author: William Morriss (@wjmelements)
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discussions-to: https://ethereum-magicians.org/t/eip-3322-efficient-gas-storage/5470
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status: Stagnant
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type: Standards Track
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category: Core
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created: 2020-03-04
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---
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## Simple Summary
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Allows contract accounts to store gas that can be transferred to the refund counter.
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## Abstract
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Contracts can persist gas for later transfer to the refund counter.
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Three opcodes are introduced to read, add to, and use this gas counter.
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## Motivation
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The refund mechanism is currently being used by gas tokens to arbitrage gas price.
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This brings gas supply elasticity and price stability by moving gas from blocks with less demand to blocks with more demand.
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Unfortunately this rewards unnecessary state growth.
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By introducing a superior gas storage mechanism, the gas market will require less storage and computation.
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## Specification
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Contract accounts gain an unsigned gas refund counter, initially zero.
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Three new opcodes are introduced to manage this state.
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* `SELFGAS` (`0x49`): Pushes the current account's gas refund counter onto the stack.
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Shares gas pricing with `SELFBALANCE`.
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* `USEGAS` (`0x4a`): Pops `amount` from the stack.
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The minimum of `amount` and the current account's gas refund counter is transferred to the execution context's refund counter.
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Costs `5000` gas.
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* `STOREGAS` (`0x4b`): Pops `amount` from the stack.
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Costs `5000 + amount` gas.
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Increases the current account's gas refund counter by `amount`.
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## Rationale
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By reusing the execution context's refund counter we can reuse its 50% DoS protection, which limits its block elasticity contribution to 2x.
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The gas costs are based on similar opcodes `SELFBALANCE` and `SSTORE`.
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Most accounts will store no gas, so the per-account storage overhead should be minimal or even zero in the normal case.
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The opcode numbers chosen are in the same `0x4X` range as `SELFBALANCE` and `GASLIMIT`.
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## Backwards Compatibility
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Because the gas is added to the refund counter, no compatibility issues are anticipated.
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## Test Cases
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| Code | Used Gas | Refund | Original | Final |
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|------------------|----------|--------|----------|-------|
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| 0x60004900 | 5003 | 0 | 0 | 0 |
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| 0x60034900 | 5003 | 2 | 2 | 0 |
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| 0x60034900 | 5003 | 3 | 3 | 0 |
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| 0x60034900 | 5003 | 3 | 4 | 1 |
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| 0x60034960034900 | 10006 | 4 | 4 | 0 |
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| 0x60034960034900 | 10006 | 6 | 6 | 0 |
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| 0x484900 | 5010 | 100000 | 100000 | 0 |
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| 0x61ffff4a00 | 70538 | 0 | 0 | 65535 |
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## Security Considerations
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DoS is already limited by the 50% refund limit.
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## Copyright
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Copyright and related rights waived via [CC0](../LICENSE.md).
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