86 lines
2.5 KiB
Go
86 lines
2.5 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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"errors"
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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/core/state"
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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. For an example see `core.VMEnv`
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type Environment interface {
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State() *state.StateDB
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Origin() common.Address
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BlockNumber() *big.Int
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GetHash(n uint64) common.Hash
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Coinbase() common.Address
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Time() *big.Int
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Difficulty() *big.Int
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GasLimit() *big.Int
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CanTransfer(from Account, balance *big.Int) bool
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Transfer(from, to Account, amount *big.Int) error
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AddLog(*state.Log)
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AddStructLog(StructLog)
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StructLogs() []StructLog
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VmType() Type
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Depth() int
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SetDepth(i int)
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Call(me ContextRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error)
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CallCode(me ContextRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error)
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Create(me ContextRef, data []byte, gas, price, value *big.Int) ([]byte, error, ContextRef)
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}
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// StructLog is emited to the Environment each cycle and lists information about the curent 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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Balance() *big.Int
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Address() common.Address
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}
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// generic transfer method
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func Transfer(from, to Account, amount *big.Int) error {
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if from.Balance().Cmp(amount) < 0 {
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return errors.New("Insufficient balance in account")
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}
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from.SubBalance(amount)
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to.AddBalance(amount)
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return nil
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}
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