Support EIP-2929: Gas cost increases for state access opcodes #571
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yperbasis
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include/evmc/mocked_host.hpp
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| @@ -156,6 +156,15 @@ class MockedHost : public Host | |||
| return accounts.count(addr) != 0; | |||
| } | |||
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| /// Access an account (EIP-2929). | |||
| evmc_access_status access_account(const address&) noexcept override { return EVMC_COLD_ACCESS; } | |||
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For later: we should implement some basic map of access to also return "warm" status. This will help with code coverage in evmone.
chfast
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| EXPECT_EQ(b[OP_CALLCODE].gas_cost, 100); | ||
| EXPECT_EQ(b[OP_DELEGATECALL].gas_cost, 100); | ||
| EXPECT_EQ(b[OP_STATICCALL].gas_cost, 100); | ||
| EXPECT_EQ(b[OP_SLOAD].gas_cost, 100); | ||
| } |
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Would also add selfdestruct/sstore to this list. They are special cases.
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SELFDESTRUCT doesn't charge WARM_STORAGE_READ_COST (EIP-2929).
SSTORE had complicated pricing logic even prior to EIP-2929; I decided not to change the previous decision to assign 0 gas cost to it in evmc.
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Fine to add these though for clarity (i.e. to document what you have just written).
include/evmc/evmc.h
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| /** Access account callback function (EIP-2929). */ | ||
| evmc_access_account_fn access_account; | ||
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| /** Access storage callback function (EIP-2929). */ |
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Do we really need to state EIP-2929 in every place? I am fine with it for now, but perhaps in the long term we don't need it?
| * @param address The address of the account. | ||
| * @return 0 if cold access, 1 if warm access. | ||
| */ | ||
| int accessAccount(byte[] address); |
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Could use boolean if it is a bool. accountExists does that.
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I used enum for clarity. It's not immediately obvious whether true means cold access or warm access.
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In C yes, but in Java it seems to be only a number :)
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We can leave a todo here to change this to enum or bool.
| @@ -126,6 +126,8 @@ mod tests { | |||
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| let host = ::evmc_sys::evmc_host_interface { | |||
| account_exists: None, | |||
| access_account: None, | |||
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It just occurred to me account_exists should be after the accessing ones if we consider some lexical ordering?
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Well, the ordering here is not lexical, but loosely logical. In
account_exists
access_account
access_storage
get_storage
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access_account & access_storage are together between account and storage operations.
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I would vote for lexical ordering.
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I'm also not sure what is the point of bringing up "lexical" ordering. For logical ordering, they more belong to the transaction context, not state access (although name indicates otherwise). For me you can put them last after emit_log.
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The other entries seemed to be lexically ordered, in most cases. I don't really care, it was just a remark.
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I didn't notice that others are not ordered, then I don't care.
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Still putting them last for historical and weak ABI stability seems a good option. I can do that in the final rebase.
chfast
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Create new instruction metrics/costs table for Berlin EVM revision. Use warm access costs from EIP-2929 "Gas cost increases for state access opcodes": https://eips.ethereum.org/EIPS/eip-2929.
Add methods access_account() and access_storage() to evmc_host_interface. These are to support EIP-2929 "Gas cost increases for state access opcodes" https://eips.ethereum.org/EIPS/eip-2929. This also defines EVMC_ACCESS_{WARM,COLD} constants for access status representation. Adjustments to Go/Java/Rust bindings are to be done in consecutive commits. Co-authored-by: Paweł Bylica <chfast@gmail.com>
Implement Java bindings for access_account() and access_storage() Host methods.
Implement Go bindings for access_account() and access_storage() Host methods.
Implement Rust bindings for access_account() and access_storage() Host methods.
ethereum/evmone#289 & erigontech/silkworm#161 provide an example of EIP-2929 implementation.