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EIP-7843: SLOTNUM opcode #2872

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EIP-7843: SLOTNUM opcode #2872

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fc091b1
kproj/{evm,schedule}.md: implement eip-7843 slotnum opcode
anvacaru Jul 16, 2026
1b0eb00
schedule.md: remove spacing
anvacaru Jul 24, 2026
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7 changes: 5 additions & 2 deletions kevm-pyk/src/kevm_pyk/kproj/evm-semantics/evm.md
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Original file line number Diff line number Diff line change
Expand Up @@ -1269,13 +1269,14 @@ These operators make queries about the current execution state.
rule <k> BASEFEE => BFEE ~> #push ... </k> <baseFee> BFEE </baseFee>
rule <k> BLOBBASEFEE => Cbasefeeperblob(SCHED, EXCESS_BLOB_GAS) ~> #push ... </k> <excessBlobGas> EXCESS_BLOB_GAS </excessBlobGas> <schedule> SCHED </schedule> requires notBool #rangeNegUInt64(EXCESS_BLOB_GAS)

syntax NullStackOp ::= "COINBASE" | "TIMESTAMP" | "NUMBER" | "DIFFICULTY" | "PREVRANDAO"
// ----------------------------------------------------------------------------------------
syntax NullStackOp ::= "COINBASE" | "TIMESTAMP" | "NUMBER" | "DIFFICULTY" | "PREVRANDAO" | "SLOTNUM"
// ---------------------------------------------------------------------------------------------------
rule <k> COINBASE => CB ~> #push ... </k> <coinbase> CB </coinbase>
rule <k> TIMESTAMP => TS ~> #push ... </k> <timestamp> TS </timestamp>
rule <k> NUMBER => NUMB ~> #push ... </k> <number> NUMB </number>
rule <k> DIFFICULTY => DIFF ~> #push ... </k> <difficulty> DIFF </difficulty>
rule <k> PREVRANDAO => RDAO ~> #push ... </k> <mixHash> RDAO </mixHash>
rule <k> SLOTNUM => SN ~> #push ... </k> <slotNumber> SN </slotNumber>

syntax NullStackOp ::= "ADDRESS" | "ORIGIN" | "CALLER" | "CALLVALUE" | "CHAINID" | "SELFBALANCE"
// ------------------------------------------------------------------------------------------------
Expand Down Expand Up @@ -2957,6 +2958,7 @@ The intrinsic gas calculation mirrors the style of the YellowPaper (appendix H).
rule <k> #gasExec(SCHED, COINBASE) => Gbase < SCHED > ... </k>
rule <k> #gasExec(SCHED, TIMESTAMP) => Gbase < SCHED > ... </k>
rule <k> #gasExec(SCHED, NUMBER) => Gbase < SCHED > ... </k>
rule <k> #gasExec(SCHED, SLOTNUM) => Gbase < SCHED > ... </k>
rule <k> #gasExec(SCHED, DIFFICULTY) => Gbase < SCHED > ... </k>
rule <k> #gasExec(SCHED, PREVRANDAO) => Gbase < SCHED > ... </k>
rule <k> #gasExec(SCHED, GASLIMIT) => Gbase < SCHED > ... </k>
Expand Down Expand Up @@ -3251,6 +3253,7 @@ After interpreting the strings representing programs as a `WordStack`, it should
rule #dasmOpCode( 72, SCHED ) => BASEFEE requires Ghasbasefee << SCHED >>
rule #dasmOpCode( 73, SCHED ) => BLOBHASH requires Ghasblobhash << SCHED >>
rule #dasmOpCode( 74, SCHED ) => BLOBBASEFEE requires Ghasblobbasefee << SCHED >>
rule #dasmOpCode( 75, SCHED ) => SLOTNUM requires Ghasslotnum << SCHED >>
rule #dasmOpCode( 80, _ ) => POP
rule #dasmOpCode( 81, _ ) => MLOAD
rule #dasmOpCode( 82, _ ) => MSTORE
Expand Down
9 changes: 6 additions & 3 deletions kevm-pyk/src/kevm_pyk/kproj/evm-semantics/schedule.md
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Expand Up @@ -31,8 +31,8 @@ module SCHEDULE
| "Ghaswarmcoinbase" | "Ghaswithdrawals" | "Ghastransient" | "Ghasmcopy"
| "Ghasbeaconroot" | "Ghaseip6780" | "Ghasblobbasefee" | "Ghasblobhash"
| "Ghasbls12msmdiscount" | "Ghashistory" | "Ghasrequests" | "Ghasauthority"
| "Ghasfloorcost" | "Ghasclz"
// -------------------------------------------------------------
| "Ghasfloorcost" | "Ghasclz" | "Ghasslotnum"
// ---------------------------------------------------------------------------------------
```

### Schedule Constants
Expand Down Expand Up @@ -183,6 +183,7 @@ A `ScheduleConst` is a constant determined by the fee schedule.
rule [GhasauthorityDefault]: Ghasauthority << DEFAULT >> => false
rule [GhasfloorcostDefault]: Ghasfloorcost << DEFAULT >> => false
rule [GhasclzDefault]: Ghasclz << DEFAULT >> => false
rule [GhasslotnumDefault]: Ghasslotnum << DEFAULT >> => false
```

### Frontier Schedule
Expand Down Expand Up @@ -526,7 +527,9 @@ A `ScheduleConst` is a constant determined by the fee schedule.
orBool SCHEDCONST ==K Blobbasefeeupdatefraction
)

rule [SCHEDFLAGAmsterdam]: SCHEDFLAG << AMSTERDAM >> => SCHEDFLAG << OSAKA >>
rule [GhasslotnumAmsterdam]: Ghasslotnum << AMSTERDAM >> => true
rule [SCHEDFLAGAmsterdam]: SCHEDFLAG << AMSTERDAM >> => SCHEDFLAG << OSAKA >>
requires notBool ( SCHEDFLAG ==K Ghasslotnum )
```

```k
Expand Down