// Copyright 2014 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 .
package core
import (
"fmt"
"math/big"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/params"
)
var (
Big0 = big.NewInt(0)
)
/*
The State Transitioning Model
A state transition is a change made when a transaction is applied to the current world state
The state transitioning model does all all the necessary work to work out a valid new state root.
1) Nonce handling
2) Pre pay gas
3) Create a new state object if the recipient is \0*32
4) Value transfer
== If contract creation ==
4a) Attempt to run transaction data
4b) If valid, use result as code for the new state object
== end ==
5) Run Script section
6) Derive new state root
*/
type StateTransition struct {
gp *GasPool
msg Message
gas, gasPrice *big.Int
initialGas *big.Int
value *big.Int
data []byte
state vm.StateDB
env *vm.EVM
}
// Message represents a message sent to a contract.
type Message interface {
From() common.Address
//FromFrontier() (common.Address, error)
To() *common.Address
GasPrice() *big.Int
Gas() *big.Int
Value() *big.Int
Nonce() uint64
CheckNonce() bool
Data() []byte
}
func MessageCreatesContract(msg Message) bool {
return msg.To() == nil
}
// IntrinsicGas computes the 'intrinsic gas' for a message
// with the given data.
func IntrinsicGas(data []byte, contractCreation, homestead bool) *big.Int {
igas := new(big.Int)
if contractCreation && homestead {
igas.Set(params.TxGasContractCreation)
} else {
igas.Set(params.TxGas)
}
if len(data) > 0 {
var nz int64
for _, byt := range data {
if byt != 0 {
nz++
}
}
m := big.NewInt(nz)
m.Mul(m, params.TxDataNonZeroGas)
igas.Add(igas, m)
m.SetInt64(int64(len(data)) - nz)
m.Mul(m, params.TxDataZeroGas)
igas.Add(igas, m)
}
return igas
}
// NewStateTransition initialises and returns a new state transition object.
func NewStateTransition(env *vm.EVM, msg Message, gp *GasPool) *StateTransition {
return &StateTransition{
gp: gp,
env: env,
msg: msg,
gas: new(big.Int),
gasPrice: msg.GasPrice(),
initialGas: new(big.Int),
value: msg.Value(),
data: msg.Data(),
state: env.StateDB,
}
}
// ApplyMessage computes the new state by applying the given message
// against the old state within the environment.
//
// ApplyMessage returns the bytes returned by any EVM execution (if it took place),
// the gas used (which includes gas refunds) and an error if it failed. An error always
// indicates a core error meaning that the message would always fail for that particular
// state and would never be accepted within a block.
func ApplyMessage(env *vm.EVM, msg Message, gp *GasPool) ([]byte, *big.Int, error) {
st := NewStateTransition(env, msg, gp)
ret, _, gasUsed, err := st.TransitionDb()
return ret, gasUsed, err
}
func (self *StateTransition) from() vm.Account {
f := self.msg.From()
if !self.state.Exist(f) {
return self.state.CreateAccount(f)
}
return self.state.GetAccount(f)
}
func (self *StateTransition) to() vm.Account {
if self.msg == nil {
return nil
}
to := self.msg.To()
if to == nil {
return nil // contract creation
}
if !self.state.Exist(*to) {
return self.state.CreateAccount(*to)
}
return self.state.GetAccount(*to)
}
func (self *StateTransition) useGas(amount *big.Int) error {
if self.gas.Cmp(amount) < 0 {
return vm.ErrOutOfGas
}
self.gas.Sub(self.gas, amount)
return nil
}
func (self *StateTransition) addGas(amount *big.Int) {
self.gas.Add(self.gas, amount)
}
func (self *StateTransition) buyGas() error {
mgas := self.msg.Gas()
mgval := new(big.Int).Mul(mgas, self.gasPrice)
sender := self.from()
if sender.Balance().Cmp(mgval) < 0 {
return fmt.Errorf("insufficient ETH for gas (%x). Req %v, has %v", sender.Address().Bytes()[:4], mgval, sender.Balance())
}
if err := self.gp.SubGas(mgas); err != nil {
return err
}
self.addGas(mgas)
self.initialGas.Set(mgas)
sender.SubBalance(mgval)
return nil
}
func (self *StateTransition) preCheck() (err error) {
msg := self.msg
sender := self.from()
// Make sure this transaction's nonce is correct
if msg.CheckNonce() {
if n := self.state.GetNonce(sender.Address()); n != msg.Nonce() {
return NonceError(msg.Nonce(), n)
}
}
// Pre-pay gas
if err = self.buyGas(); err != nil {
if IsGasLimitErr(err) {
return err
}
return InvalidTxError(err)
}
return nil
}
// TransitionDb will move the state by applying the message against the given environment.
func (self *StateTransition) TransitionDb() (ret []byte, requiredGas, usedGas *big.Int, err error) {
if err = self.preCheck(); err != nil {
return
}
msg := self.msg
sender := self.from() // err checked in preCheck
homestead := self.env.ChainConfig().IsHomestead(self.env.BlockNumber)
contractCreation := MessageCreatesContract(msg)
// Pay intrinsic gas
if err = self.useGas(IntrinsicGas(self.data, contractCreation, homestead)); err != nil {
return nil, nil, nil, InvalidTxError(err)
}
var (
vmenv = self.env
// vm errors do not effect consensus and are therefor
// not assigned to err, except for insufficient balance
// error.
vmerr error
)
if contractCreation {
ret, _, vmerr = vmenv.Create(sender, self.data, self.gas, self.value)
if homestead && err == vm.ErrCodeStoreOutOfGas {
self.gas = Big0
}
} else {
// Increment the nonce for the next transaction
self.state.SetNonce(sender.Address(), self.state.GetNonce(sender.Address())+1)
ret, vmerr = vmenv.Call(sender, self.to().Address(), self.data, self.gas, self.value)
}
if vmerr != nil {
glog.V(logger.Core).Infoln("vm returned with error:", err)
// The only possible consensus-error would be if there wasn't
// sufficient balance to make the transfer happen. The first
// balance transfer may never fail.
if vmerr == vm.ErrInsufficientBalance {
return nil, nil, nil, InvalidTxError(vmerr)
}
}
requiredGas = new(big.Int).Set(self.gasUsed())
self.refundGas()
self.state.AddBalance(self.env.Coinbase, new(big.Int).Mul(self.gasUsed(), self.gasPrice))
return ret, requiredGas, self.gasUsed(), err
}
func (self *StateTransition) refundGas() {
// Return eth for remaining gas to the sender account,
// exchanged at the original rate.
sender := self.from() // err already checked
remaining := new(big.Int).Mul(self.gas, self.gasPrice)
sender.AddBalance(remaining)
// Apply refund counter, capped to half of the used gas.
uhalf := remaining.Div(self.gasUsed(), common.Big2)
refund := common.BigMin(uhalf, self.state.GetRefund())
self.gas.Add(self.gas, refund)
self.state.AddBalance(sender.Address(), refund.Mul(refund, self.gasPrice))
// Also return remaining gas to the block gas counter so it is
// available for the next transaction.
self.gp.AddGas(self.gas)
}
func (self *StateTransition) gasUsed() *big.Int {
return new(big.Int).Sub(self.initialGas, self.gas)
}
ons'>-2/+7
| * | converters/wkhtmltopdf: fix build on arm64/aarch64 | Kurt Jaeger | 2020-11-15 | 1 | -1/+0 |
| * | converters/wkhtmltopdf: fix build on GCC architectures | Piotr Kubaj | 2020-09-22 | 1 | -2/+1 |
| * | converters/wkhtmltopdf: update 0.12.5 -> 0.12.6, fix build | Kurt Jaeger | 2020-07-23 | 1 | -5/+3 |
| * | Add USES=xorg USES=gl, ports categories c | Niclas Zeising | 2019-11-05 | 1 | -1/+1 |
| * | converters/wkhtmltopdf: fix build by adding LIB_DEPENDS on www/qt5-webkit | Kurt Jaeger | 2019-10-19 | 1 | -2/+3 |
| * | Bump PORTREVISION for ports depending on the canonical version of GCC | Gerald Pfeifer | 2019-07-27 | 1 | -1/+1 |
| * | converters/wkhtmltopdf: unbreak with openssl111 | Kurt Jaeger | 2019-03-25 | 1 | -4/+2 |
| * | converters/wkhtmltopdf: fix build with openssl 1.1.1 | Kurt Jaeger | 2019-01-06 | 1 | -1/+1 |
| * | Bump PORTREVISION for ports depending on the canonical version of GCC | Gerald Pfeifer | 2018-12-12 | 1 | -2/+1 |
| * | security/openssl-devel was removed, but there is a security/openssl111 now. | Mathieu Arnold | 2018-11-10 | 1 | -2/+2 |
| * | converters/wkhtmltopdf: fix build on powerpc64 | Kurt Jaeger | 2018-10-02 | 1 | -2/+4 |
| * | multimedia/*phonon*: update and flavorize with @qt4/@qt5 | Tobias C. Berner | 2018-06-22 | 1 | -0/+1 |
| * | converters/wkhtmltopdf: add run-dependency on x11-fonts/webfonts | Kurt Jaeger | 2018-06-13 | 1 | -0/+2 |
| * | converters/wkhtmltopdf: update 0.12.4 -> 0.12.5, unbreak | Kurt Jaeger | 2018-06-13 | 1 | -20/+15 |
| * | Add more information to stub error messages. | Mark Linimon | 2018-03-10 | 1 | -8/+8 |
| * | Unbreak | Antoine Brodin | 2018-02-24 | 1 | -1/+1 |
| * | Mark wkhtmltopdf as broken for clang >= 6.0 until fixed | Martin Matuska | 2018-02-24 | 1 | -1/+9 |
| * | BROKEN_SSL: Add REASON for breakage | Bernard Spil | 2018-02-17 | 1 | -0/+1 |
| * | security/openssl-devel: Mark broken cat c* | Bernard Spil | 2018-02-16 | 1 | -0/+1 |
| * | For ports that are marked BROKEN on armv6, and also fail to build on | Mark Linimon | 2017-11-30 | 1 | -0/+1 |
| * | Update to 0.12.4 | Michael Gmelin | 2017-03-27 | 1 | -2/+7 |
| * | Mark as broken on various tier-2 archs. | Mark Linimon | 2016-11-14 | 1 | -2/+5 |
| * | converters/wkhtmltopdf: Document SSL build requirement | John Marino | 2016-09-10 | 1 | -1/+1 |
| * | Update converters/wkhtmltopdf to 0.12.3.2 | Martin Matuska | 2016-07-05 | 1 | -7/+10 |
| * | many ports: mark broken on powerpc64 | Steve Wills | 2016-04-22 | 1 | -0/+2 |
| * | Remove ${PORTSDIR}/ from dependencies, Mk and categories a, b, and c. | Mathieu Arnold | 2016-04-01 | 1 | -3/+3 |
| * | - Remove "BROKEN on powerpc" statement: the port builds and links fine | Alexey Dokuchaev | 2015-09-04 | 1 | -17/+10 |
| * | Convert to USES=jpeg | Antoine Brodin | 2015-06-23 | 1 | -2/+1 |
| * | MASTER_SITES cleanup. | Mathieu Arnold | 2015-05-14 |