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Automatically merged updates to draft EIP(s) 1702 (#2141) 

Hi, I'm a bot! This change was automatically merged because:

 - It only modifies existing Draft or Last Call EIP(s)
 - The PR was approved or written by at least one author of each modified EIP
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Wei Tang 2019-06-24 17:58:19 +02:00 committed by EIP Automerge Bot
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EIPS/eip-1702.md
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@ -48,6 +48,11 @@ items: `nonce`, `balance`, `storageRoot`, `codeHash`, and
items. When `version` is not zero, the account is RLP-encoded with 5
items.
Account versions can also optionally define additional account state
RLP fields, whose meaning are specified through its `version`
field. In those cases, the parsing strategy is defined in "Additional
Fields in Account State RLP" section.
### Contract Execution
When fetching an account code from state, we always fetch the
@ -98,6 +103,23 @@ Precompiled contracts and externally-owned addresses do not have
`STATICCALL` / `DELEGATECALL` touches a new externally-owned address
or a non-existing precompiled contract address, it is always created
with `version` field being `0`.
### Additional Fields in Account State RLP
In the future we may need to associate more information into an
account, and we already have some EIPs that define new additional
fields in the account state RLP. In this section, we define the
parsing strategy when additional fields are added.
* Check the RLP list length, if it is 4, then set account version to
`0`, and do not parse any additional fields.
* If the RLP list length more than 4, set the account version to the
integer at position `4` (counting from `0`).
* Check version specification for the number of additional fields
defined `N`, if the RLP list length is not equal to `5 + N`,
return parse error.
* Parse RLP position `5` to `4 + N` as the meaning specified in
additional fields.
## Extensions
@ -137,6 +159,17 @@ for example, EVM and eWASM. For each of them, we define:
* **Features**: all additional features that are enabled upon this
version.
If a meta EIP includes EIPs that provide additional account state RLP
fields, we also define:
* **Account fields**: all account fields up to the end of this meta
EIP, excluding the basic 5 fields (`nonce`, `balance`,
`storageRoot`, `codeHash` and `version`). If EIPs included that are
specific to modifying account fields do not modify VM execution
logic, it is recommended that we specify an additional version whose
execution logic is the same as previous version, but only the
account fields are changed.
## Rationale
This introduces account versioning via a new RLP item in account