github.com/codysnider/go-ethereum@v1.10.18-0.20220420071915-14f4ae99222a/cmd/evm/disasm.go (about)

     1  // Copyright 2017 The go-ethereum Authors
     2  // This file is part of go-ethereum.
     3  //
     4  // go-ethereum is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // go-ethereum is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU General Public License
    15  // along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package main
    18  
    19  import (
    20  	"errors"
    21  	"fmt"
    22  	"io/ioutil"
    23  	"strings"
    24  
    25  	"github.com/ethereum/go-ethereum/core/asm"
    26  	"gopkg.in/urfave/cli.v1"
    27  )
    28  
    29  var disasmCommand = cli.Command{
    30  	Action:    disasmCmd,
    31  	Name:      "disasm",
    32  	Usage:     "disassembles evm binary",
    33  	ArgsUsage: "<file>",
    34  }
    35  
    36  func disasmCmd(ctx *cli.Context) error {
    37  	var in string
    38  	switch {
    39  	case len(ctx.Args().First()) > 0:
    40  		fn := ctx.Args().First()
    41  		input, err := ioutil.ReadFile(fn)
    42  		if err != nil {
    43  			return err
    44  		}
    45  		in = string(input)
    46  	case ctx.GlobalIsSet(InputFlag.Name):
    47  		in = ctx.GlobalString(InputFlag.Name)
    48  	default:
    49  		return errors.New("missing filename or --input value")
    50  	}
    51  
    52  	code := strings.TrimSpace(in)
    53  	fmt.Printf("%v\n", code)
    54  	return asm.PrintDisassembled(code)
    55  }