[DRAFT] EIP-3978: Introduce gas refunds on reverts (ethereum#3978)

* Introduce gas refunds on reverts * Update EIPS/eip-3978.md Co-authored-by: lightclient <14004106+lightclient@users.noreply.github.com> * Fixes * Update EIPS/eip-3978.md Co-authored-by: lightclient <14004106+lightclient@users.noreply.github.com> * Fix narrative * Update EIPS/eip-3978.md Co-authored-by: Micah Zoltu <micah@zoltu.net> * Update EIPS/eip-3978.md Co-authored-by: Micah Zoltu <micah@zoltu.net> Co-authored-by: lightclient <14004106+lightclient@users.noreply.github.com> Co-authored-by: Micah Zoltu <micah@zoltu.net>
PhABC · Jan 25, 2022 · 6f57901 · 6f57901
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+---
+eip: 3978
+title: Gas refunds on reverts
+description: Do not erase gas refunds on transaction subcall reverts, due users pay a lot of gas for storage non-modification.
+author: Anton Bukov (@k06a), Mikhail Melnik (@ZumZoom)
+discussions-to: https://ethereum-magicians.org/t/eip-3978-gas-refunds-on-reverts/7071/
+status: Draft
+type: Standards Track
+category: Core
+created: 2021-09-16
+---
+
+## Abstract
+
+ Since [EIP-3298](./eip-3298.md) gas refunds works for storage restores only inside the same transaction. For example [ERC-20](./eip-20.md) `approve` + `transferFrom` flow between 2 smart contracts according to [EIP-2200](./eip-2200.md) and [EIP-2929](./eip-2929.md) will cost nearly to `21600` gas with gas refund counter `20000`. But in case of reverting this subcall (containing both `approve` and `transferForm`) gas refund will be erased, while smart contract storage will remain unmodified. I think it should keep storage access costs, but still refund modification costs.
+
+## Motivation
+
+Сurrent full cancelling of gas refunds on internal reverts is too unfair. Users pay for non-modification same cost as for modification.
+
+## Specification
+
+Let's count all SSTORE gas costs within every subcall, excluding access costs. And on reverting any subcall let's not erase refund counter, but:
+```
+tx.gas_refund_counter = tx.gas_refund_counter - call.gas_refund_counter + MIN(call.gas_refund_counter, call.all_sstores_gas_cost)
+```
+
+## Rationale
+
+TBD
+
+## Backwards Compatibility
+
+No known backward incompatibilities.
+
+## Test Cases
+
+TBD
+
+## Reference Implementation
+
+TBD
+
+## Security Considerations
+
+TBD
+
+## Copyright
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).