// Copyright 2014 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
// evm executes EVM code snippets.
package main
import (
"fmt"
"math/big"
"os"
"runtime"
"time"
"github.com/ethereum/go-ethereum/cmd/utils"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/logger/glog"
"gopkg.in/urfave/cli.v1"
)
var gitCommit = "" // Git SHA1 commit hash of the release (set via linker flags)
var (
app = utils.NewApp(gitCommit, "the evm command line interface")
DebugFlag = cli.BoolFlag{
Name: "debug",
Usage: "output full trace logs",
}
ForceJitFlag = cli.BoolFlag{
Name: "forcejit",
Usage: "forces jit compilation",
}
DisableJitFlag = cli.BoolFlag{
Name: "nojit",
Usage: "disabled jit compilation",
}
CodeFlag = cli.StringFlag{
Name: "code",
Usage: "EVM code",
}
GasFlag = cli.StringFlag{
Name: "gas",
Usage: "gas limit for the evm",
Value: "10000000000",
}
PriceFlag = cli.StringFlag{
Name: "price",
Usage: "price set for the evm",
Value: "0",
}
ValueFlag = cli.StringFlag{
Name: "value",
Usage: "value set for the evm",
Value: "0",
}
DumpFlag = cli.BoolFlag{
Name: "dump",
Usage: "dumps the state after the run",
}
InputFlag = cli.StringFlag{
Name: "input",
Usage: "input for the EVM",
}
SysStatFlag = cli.BoolFlag{
Name: "sysstat",
Usage: "display system stats",
}
VerbosityFlag = cli.IntFlag{
Name: "verbosity",
Usage: "sets the verbosity level",
}
CreateFlag = cli.BoolFlag{
Name: "create",
Usage: "indicates the action should be create rather than call",
}
)
func init() {
app.Flags = []cli.Flag{
CreateFlag,
DebugFlag,
VerbosityFlag,
ForceJitFlag,
DisableJitFlag,
SysStatFlag,
CodeFlag,
GasFlag,
PriceFlag,
ValueFlag,
DumpFlag,
InputFlag,
}
app.Action = run
}
func run(ctx *cli.Context) error {
glog.SetToStderr(true)
glog.SetV(ctx.GlobalInt(VerbosityFlag.Name))
db, _ := ethdb.NewMemDatabase()
statedb, _ := state.New(common.Hash{}, db)
sender := statedb.CreateAccount(common.StringToAddress("sender"))
logger := vm.NewStructLogger(nil)
vmenv := NewEnv(statedb, common.StringToAddress("evmuser"), common.Big(ctx.GlobalString(ValueFlag.Name)), vm.Config{
Debug: ctx.GlobalBool(DebugFlag.Name),
ForceJit: ctx.GlobalBool(ForceJitFlag.Name),
EnableJit: !ctx.GlobalBool(DisableJitFlag.Name),
Tracer: logger,
})
tstart := time.Now()
var (
ret []byte
err error
)
if ctx.GlobalBool(CreateFlag.Name) {
input := append(common.Hex2Bytes(ctx.GlobalString(CodeFlag.Name)), common.Hex2Bytes(ctx.GlobalString(InputFlag.Name))...)
ret, _, err = vmenv.Create(
sender,
input,
common.Big(ctx.GlobalString(GasFlag.Name)),
common.Big(ctx.GlobalString(PriceFlag.Name)),
common.Big(ctx.GlobalString(ValueFlag.Name)),
)
} else {
receiver := statedb.CreateAccount(common.StringToAddress("receiver"))
code := common.Hex2Bytes(ctx.GlobalString(CodeFlag.Name))
receiver.SetCode(crypto.Keccak256Hash(code), code)
ret, err = vmenv.Call(
sender,
receiver.Address(),
common.Hex2Bytes(ctx.GlobalString(InputFlag.Name)),
common.Big(ctx.GlobalString(GasFlag.Name)),
common.Big(ctx.GlobalString(PriceFlag.Name)),
common.Big(ctx.GlobalString(ValueFlag.Name)),
)
}
vmdone := time.Since(tstart)
if ctx.GlobalBool(DumpFlag.Name) {
statedb.Commit()
fmt.Println(string(statedb.Dump()))
}
vm.StdErrFormat(logger.StructLogs())
if ctx.GlobalBool(SysStatFlag.Name) {
var mem runtime.MemStats
runtime.ReadMemStats(&mem)
fmt.Printf("vm took %v\n", vmdone)
fmt.Printf(`alloc: %d
tot alloc: %d
no. malloc: %d
heap alloc: %d
heap objs: %d
num gc: %d
`, mem.Alloc, mem.TotalAlloc, mem.Mallocs, mem.HeapAlloc, mem.HeapObjects, mem.NumGC)
}
fmt.Printf("OUT: 0x%x", ret)
if err != nil {
fmt.Printf(" error: %v", err)
}
fmt.Println()
return nil
}
func main() {
if err := app.Run(os.Args); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
}
type VMEnv struct {
state *state.StateDB
block *types.Block
transactor *common.Address
value *big.Int
depth int
Gas *big.Int
time *big.Int
logs []vm.StructLog
evm *vm.EVM
}
func NewEnv(state *state.StateDB, transactor common.Address, value *big.Int, cfg vm.Config) *VMEnv {
env := &VMEnv{
state: state,
transactor: &transactor,
value: value,
time: big.NewInt(time.Now().Unix()),
}
env.evm = vm.New(env, cfg)
return env
}
// ruleSet implements vm.RuleSet and will always default to the homestead rule set.
type ruleSet struct{}
func (ruleSet) IsHomestead(*big.Int) bool { return true }
func (self *VMEnv) RuleSet() vm.RuleSet { return ruleSet{} }
func (self *VMEnv) Vm() vm.Vm { return self.evm }
func (self *VMEnv) Db() vm.Database { return self.state }
func (self *VMEnv) SnapshotDatabase() int { return self.state.Snapshot() }
func (self *VMEnv) RevertToSnapshot(snap int) { self.state.RevertToSnapshot(snap) }
func (self *VMEnv) Origin() common.Address { return *self.transactor }
func (self *VMEnv) BlockNumber() *big.Int { return common.Big0 }
func (self *VMEnv) Coinbase() common.Address { return *self.transactor }
func (self *VMEnv) Time() *big.Int { return self.time }
func (self *VMEnv) Difficulty() *big.Int { return common.Big1 }
func (self *VMEnv) BlockHash() []byte { return make([]byte, 32) }
func (self *VMEnv) Value() *big.Int { return self.value }
func (self *VMEnv) GasLimit() *big.Int { return big.NewInt(1000000000) }
func (self *VMEnv) VmType() vm.Type { return vm.StdVmTy }
func (self *VMEnv) Depth() int { return 0 }
func (self *VMEnv) SetDepth(i int) { self.depth = i }
func (self *VMEnv) GetHash(n uint64) common.Hash {
if self.block.Number().Cmp(big.NewInt(int64(n))) == 0 {
return self.block.Hash()
}
return common.Hash{}
}
func (self *VMEnv) AddLog(log *vm.Log) {
self.state.AddLog(log)
}
func (self *VMEnv) CanTransfer(from common.Address, balance *big.Int) bool {
return self.state.GetBalance(from).Cmp(balance) >= 0
}
func (self *VMEnv) Transfer(from, to vm.Account, amount *big.Int) {
core.Transfer(from, to, amount)
}
func (self *VMEnv) Call(caller vm.ContractRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error) {
self.Gas = gas
return core.Call(self, caller, addr, data, gas, price, value)
}
func (self *VMEnv) CallCode(caller vm.ContractRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error) {
return core.CallCode(self, caller, addr, data, gas, price, value)
}
func (self *VMEnv) DelegateCall(caller vm.ContractRef, addr common.Address, data []byte, gas, price *big.Int) ([]byte, error) {
return core.DelegateCall(self, caller, addr, data, gas, price)
}
func (self *VMEnv) Create(caller vm.ContractRef, data []byte, gas, price, value *big.Int) ([]byte, common.Address, error) {
return core.Create(self, caller, data, gas, price, value)
}
