129 lines
3.9 KiB
Go
129 lines
3.9 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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// Environment is is required by the virtual machine to get information from
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// it's own isolated environment.
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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 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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// Adds a structured log to the env
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AddStructLog(StructLog)
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// Returns all coalesced structured logs
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StructLogs() []StructLog
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// Type of the VM
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VmType() Type
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// Current calling depth
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Depth() int
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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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// 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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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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// StructLog is emitted to the Environment each cycle and lists information about the current internal state
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// prior to the execution of the statement.
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type StructLog struct {
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Pc uint64
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Op OpCode
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Gas *big.Int
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GasCost *big.Int
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Memory []byte
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Stack []*big.Int
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Storage map[common.Hash][]byte
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Err error
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}
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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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EachStorage(cb func(key, value []byte))
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Value() *big.Int
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}
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