127 lines
4.1 KiB
Go
127 lines
4.1 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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)
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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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}
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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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MakeSnapshot() Database
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// Set database to previous snapshot
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SetSnapshot(Database)
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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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// Mark the code hash that was executed
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MarkCodeHash(hash common.Hash)
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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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GetCode(common.Address) []byte
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SetCode(common.Address, []byte)
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GetCodeHash(common.Address) common.Hash
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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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Delete(common.Address) bool
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Exist(common.Address) bool
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IsDeleted(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([]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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