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feat: remove codesize warm read #11

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lightclient merged 1 commit into from
Jul 3, 2025
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feat: remove codesize warm read #11

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7 changes: 3 additions & 4 deletions EIPS/eip-7907.md
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Expand Up @@ -29,15 +29,14 @@ The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "S

1. Update the [EIP-170](./eip-170.md) contract code size limit of 24KB (`0x6000` bytes) to 48KB (`0xc000` bytes).
2. Change the gas schedule for opcodes which load code. Specifically, the opcodes `CALL`, `STATICCALL`, `DELEGATECALL`, `CALLCODE` and `EXTCODECOPY` are modified so that `largeContractCost = ceil32(excess_contract_size) * GAS_CODE_LOAD_WORD_COST // 32` gas is added to the access cost if the code is cold, where `excess_contract_size = max(0, contract_size - 0x6000)`, and `GAS_CODE_LOAD_WORD_COST = 4`. (Cf. initcode metering: [EELS](https://github.com/ethereum/execution-specs/blob/1a587803e3e698407d204888b02342393f8b4fe5/src/ethereum/cancun/vm/gas.py#L269)). This introduces a new warm state for contract code - warm if the code has been loaded, cold if not.
3. The cost for `EXTCODESIZE` is updated to acknowlege the potential for two database reads: once for the code hash and once for the code size associated with the code hash.
3. The cost for `EXTCODESIZE` is updated to acknowlege the potential for two database reads: once for the account (making it warm) and second for code size if bytecode is marked as cold. Bytecode will not be marked as warm as only codesize is read.
with the hash. In addition to the current pricing scheme defined under [EIP-2929](./eip-2929.md), the instruction will also be subject to regular storage pricing, e.g. `COLD_SLOAD_COST` and `WARM_SLOAD_COST`.
4. Update the [EIP-3860](./eip-3860.md) contract initcode size limit of 48KB (`0xc000` bytes) to 96KB (`0x18000` bytes).

| Contract | Gas changes (only opcodes that load code) | How? |
| ----------------------- | ------------------------------------------------------------------ | -------------------------------------------------------------------------------------------------------------------------- |
| Cold account, size, and code | Add `COLD_SLOAD_COST=2300`, `largeContractCost`, and `COLD_ACCOUNT_ACCESS_COST=2600` | Contract not in access list nor accessed prior in the txn |
| Warm account, cold size and code | Add `COLD_SLOAD_COST=2300`, `largeContractCost`, and `WARM_STORAGE_READ_COST=100` | Already accessed balance, storage, or included in access list ([EIP-2930](./eip-2930.md)) |
| Warm account and size, cold code | Add `WARM_STORAGE_READ_COST=100`, `largeContractCost`, and `WARM_STORAGE_READ_COST=100` | Already accessed code size via `EXTCODESIZE` ([EIP-2930](./eip-2930.md)) |
| Cold account and code | Add `COLD_SLOAD_COST=2100`, `largeContractCost`, and `COLD_ACCOUNT_ACCESS_COST=2600` | Contract not in access list nor accessed prior in the txn |
| Warm account and cold code | Add `COLD_SLOAD_COST=2100`, `largeContractCost`, and `WARM_STORAGE_READ_COST=100` | Already accessed balance, storage, or included in access list ([EIP-2930](./eip-2930.md)) |
| Warm account and code | No change to existing gas schedule. `WARM_STORAGE_READ_COST=100` | Contract created with `CREATE`/`CREATE2`, or `CALL`, `STATICCALL`, `DELEGATECALL`, `CALLCODE` or `EXTCODECOPY` made on the contract, previously in the txn (opcodes that load contract code) |

`COLD_ACCOUNT_ACCESS_COST`, `COLD_SLOAD_COST`, and `WARM_STORAGE_READ_COST` are defined in [EIP-2929](./eip-2929.md#parameters).
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