github.com/ethxdao/go-ethereum@v0.0.0-20221218102228-5ae34a9cc189/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  	"os"
    23  	"strings"
    24  
    25  	"github.com/ethxdao/go-ethereum/core/asm"
    26  )
    27  
    28  var disasmCommand = &cli.Command{
    29  	Action:    disasmCmd,
    30  	Name:      "disasm",
    31  	Usage:     "disassembles evm binary",
    32  	ArgsUsage: "<file>",
    33  }
    34  
    35  func disasmCmd(ctx *cli.Context) error {
    36  	var in string
    37  	switch {
    38  	case len(ctx.Args().First()) > 0:
    39  		fn := ctx.Args().First()
    40  		input, err := os.ReadFile(fn)
    41  		if err != nil {
    42  			return err
    43  		}
    44  		in = string(input)
    45  	case ctx.IsSet(InputFlag.Name):
    46  		in = ctx.String(InputFlag.Name)
    47  	default:
    48  		return errors.New("missing filename or --input value")
    49  	}
    50  
    51  	code := strings.TrimSpace(in)
    52  	fmt.Printf("%v\n", code)
    53  	return asm.PrintDisassembled(code)
    54  }