path: root/cmd/evm/main.go

// 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"
    "io/ioutil"
    "os"
    goruntime "runtime"
    "time"

    "github.com/ethereum/go-ethereum/cmd/utils"
    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/core/state"
    "github.com/ethereum/go-ethereum/core/vm"
    "github.com/ethereum/go-ethereum/core/vm/runtime"
    "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",
    }
    CodeFlag = cli.StringFlag{
        Name:  "code",
        Usage: "EVM code",
    }
    CodeFileFlag = cli.StringFlag{
        Name:  "codefile",
        Usage: "file containing 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",
    }
    DisableGasMeteringFlag = cli.BoolFlag{
        Name:  "nogasmetering",
        Usage: "disable gas metering",
    }
)

func init() {
    app.Flags = []cli.Flag{
        CreateFlag,
        DebugFlag,
        VerbosityFlag,
        SysStatFlag,
        CodeFlag,
        CodeFileFlag,
        GasFlag,
        PriceFlag,
        ValueFlag,
        DumpFlag,
        InputFlag,
        DisableGasMeteringFlag,
    }
    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)

    tstart := time.Now()

    var (
        code []byte
        ret  []byte
        err  error
    )

    if ctx.GlobalString(CodeFlag.Name) != "" {
        code = common.Hex2Bytes(ctx.GlobalString(CodeFlag.Name))
    } else {
        var hexcode []byte
        if ctx.GlobalString(CodeFileFlag.Name) != "" {
            var err error
            hexcode, err = ioutil.ReadFile(ctx.GlobalString(CodeFileFlag.Name))
            if err != nil {
                fmt.Printf("Could not load code from file: %v\n", err)
                os.Exit(1)
            }
        } else {
            var err error
            hexcode, err = ioutil.ReadAll(os.Stdin)
            if err != nil {
                fmt.Printf("Could not load code from stdin: %v\n", err)
                os.Exit(1)
            }
        }
        code = common.Hex2Bytes(string(hexcode[:]))
    }

    if ctx.GlobalBool(CreateFlag.Name) {
        input := append(code, common.Hex2Bytes(ctx.GlobalString(InputFlag.Name))...)
        ret, _, err = runtime.Create(input, &runtime.Config{
            Origin:   sender.Address(),
            State:    statedb,
            GasLimit: common.Big(ctx.GlobalString(GasFlag.Name)),
            GasPrice: common.Big(ctx.GlobalString(PriceFlag.Name)),
            Value:    common.Big(ctx.GlobalString(ValueFlag.Name)),
            EVMConfig: vm.Config{
                Tracer:             logger,
                Debug:              ctx.GlobalBool(DebugFlag.Name),
                DisableGasMetering: ctx.GlobalBool(DisableGasMeteringFlag.Name),
            },
        })
    } else {
        receiver := statedb.CreateAccount(common.StringToAddress("receiver"))
        receiver.SetCode(crypto.Keccak256Hash(code), code)

        ret, err = runtime.Call(receiver.Address(), common.Hex2Bytes(ctx.GlobalString(InputFlag.Name)), &runtime.Config{
            Origin:   sender.Address(),
            State:    statedb,
            GasLimit: common.Big(ctx.GlobalString(GasFlag.Name)),
            GasPrice: common.Big(ctx.GlobalString(PriceFlag.Name)),
            Value:    common.Big(ctx.GlobalString(ValueFlag.Name)),
            EVMConfig: vm.Config{
                Tracer:             logger,
                Debug:              ctx.GlobalBool(DebugFlag.Name),
                DisableGasMetering: ctx.GlobalBool(DisableGasMeteringFlag.Name),
            },
        })
    }
    vmdone := time.Since(tstart)

    if ctx.GlobalBool(DumpFlag.Name) {
        statedb.Commit(true)
        fmt.Println(string(statedb.Dump()))
    }
    vm.StdErrFormat(logger.StructLogs())

    if ctx.GlobalBool(SysStatFlag.Name) {
        var mem goruntime.MemStats
        goruntime.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)
    }
}