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64af2aafda
This implements 1b & 1c of EIP150 by adding a new GasTable which must be returned from the RuleSet config method. This table is used to determine the gas prices for the current epoch. Please note that when the CreateBySuicide gas price is set it is assumed that we're in the new epoch phase. In addition this PR will serve as temporary basis while refactorisation in being done in the EVM64 PR, which will substentially overhaul the gas price code.
133 lines
4.4 KiB
Go
133 lines
4.4 KiB
Go
// Copyright 2014 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package vm
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import (
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/params"
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)
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// RuleSet is an interface that defines the current rule set during the
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// execution of the EVM instructions (e.g. whether it's homestead)
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type RuleSet interface {
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IsHomestead(*big.Int) bool
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// GasTable returns the gas prices for this phase, which is based on
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// block number passed in.
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GasTable(*big.Int) params.GasTable
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}
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// Environment is an EVM requirement and helper which allows access to outside
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// information such as states.
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type Environment interface {
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// The current ruleset
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RuleSet() RuleSet
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// The state database
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Db() Database
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// Creates a restorable snapshot
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SnapshotDatabase() int
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// Set database to previous snapshot
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RevertToSnapshot(int)
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// Address of the original invoker (first occurrence of the VM invoker)
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Origin() common.Address
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// The block number this VM is invoked on
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BlockNumber() *big.Int
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// The n'th hash ago from this block number
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GetHash(uint64) common.Hash
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// The handler's address
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Coinbase() common.Address
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// The current time (block time)
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Time() *big.Int
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// Difficulty set on the current block
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Difficulty() *big.Int
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// The gas limit of the block
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GasLimit() *big.Int
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// Determines whether it's possible to transact
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CanTransfer(from common.Address, balance *big.Int) bool
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// Transfers amount from one account to the other
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Transfer(from, to Account, amount *big.Int)
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// Adds a LOG to the state
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AddLog(*Log)
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// Type of the VM
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Vm() Vm
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// Get the curret calling depth
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Depth() int
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// Set the current calling depth
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SetDepth(i int)
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// Call another contract
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Call(me ContractRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error)
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// Take another's contract code and execute within our own context
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CallCode(me ContractRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error)
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// Same as CallCode except sender and value is propagated from parent to child scope
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DelegateCall(me ContractRef, addr common.Address, data []byte, gas, price *big.Int) ([]byte, error)
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// Create a new contract
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Create(me ContractRef, data []byte, gas, price, value *big.Int) ([]byte, common.Address, error)
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}
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// Vm is the basic interface for an implementation of the EVM.
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type Vm interface {
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// Run should execute the given contract with the input given in in
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// and return the contract execution return bytes or an error if it
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// failed.
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Run(c *Contract, in []byte) ([]byte, error)
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}
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// Database is a EVM database for full state querying.
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type Database interface {
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GetAccount(common.Address) Account
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CreateAccount(common.Address) Account
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AddBalance(common.Address, *big.Int)
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GetBalance(common.Address) *big.Int
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GetNonce(common.Address) uint64
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SetNonce(common.Address, uint64)
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GetCodeHash(common.Address) common.Hash
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GetCodeSize(common.Address) int
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GetCode(common.Address) []byte
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SetCode(common.Address, []byte)
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AddRefund(*big.Int)
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GetRefund() *big.Int
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GetState(common.Address, common.Hash) common.Hash
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SetState(common.Address, common.Hash, common.Hash)
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Suicide(common.Address) bool
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HasSuicided(common.Address) bool
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// Exist reports whether the given account exists in state.
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// Notably this should also return true for suicided accounts.
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Exist(common.Address) bool
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}
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// Account represents a contract or basic ethereum account.
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type Account interface {
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SubBalance(amount *big.Int)
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AddBalance(amount *big.Int)
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SetBalance(*big.Int)
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SetNonce(uint64)
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Balance() *big.Int
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Address() common.Address
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ReturnGas(*big.Int, *big.Int)
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SetCode(common.Hash, []byte)
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ForEachStorage(cb func(key, value common.Hash) bool)
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Value() *big.Int
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}
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