plugeth/core/vm/jump_table_export.go
Martin Holst Swende b3f43c89b3
core/vm: expose jumptable constructors (#26880)
When interacting with geth as a library to e.g. produce state tests, it is desirable to obtain the consensus-correct jumptable definition for a given fork. This changes adds accessors so the instructionset can be obtained and characteristics about opcodes can be inspected.
2023-03-21 07:14:47 -04:00

75 lines
2.6 KiB
Go

// Copyright 2023 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package vm
import (
"errors"
"github.com/ethereum/go-ethereum/params"
)
// LookupInstructionSet returns the instructionset for the fork configured by
// the rules.
func LookupInstructionSet(rules params.Rules) (JumpTable, error) {
switch {
case rules.IsPrague:
return newShanghaiInstructionSet(), errors.New("prague-fork not defined yet")
case rules.IsCancun:
return newShanghaiInstructionSet(), errors.New("cancun-fork not defined yet")
case rules.IsShanghai:
return newShanghaiInstructionSet(), nil
case rules.IsMerge:
return newMergeInstructionSet(), nil
case rules.IsLondon:
return newLondonInstructionSet(), nil
case rules.IsBerlin:
return newBerlinInstructionSet(), nil
case rules.IsIstanbul:
return newIstanbulInstructionSet(), nil
case rules.IsConstantinople:
return newConstantinopleInstructionSet(), nil
case rules.IsByzantium:
return newByzantiumInstructionSet(), nil
case rules.IsEIP158:
return newSpuriousDragonInstructionSet(), nil
case rules.IsEIP150:
return newTangerineWhistleInstructionSet(), nil
case rules.IsHomestead:
return newHomesteadInstructionSet(), nil
}
return newFrontierInstructionSet(), nil
}
// Stack returns the mininum and maximum stack requirements.
func (op *operation) Stack() (int, int) {
return op.minStack, op.maxStack
}
// HasCost returns true if the opcode has a cost. Opcodes which do _not_ have
// a cost assigned are one of two things:
// - undefined, a.k.a invalid opcodes,
// - the STOP opcode.
// This method can thus be used to check if an opcode is "Invalid (or STOP)".
func (op *operation) HasCost() bool {
// Ideally, we'd check this:
// return op.execute == opUndefined
// However, go-lang does now allow that. So we'll just check some other
// 'indicators' that this is an invalid op. Alas, STOP is impossible to
// filter out
return op.dynamicGas != nil || op.constantGas != 0
}