github.com/ethereumproject/go-ethereum@v5.5.2+incompatible/cmd/disasm/main.go (about)

     1  // Copyright 2015 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  // disasm is a pretty-printer for EVM bytecode.
    18  package main
    19  
    20  import (
    21  	"flag"
    22  	"fmt"
    23  	"io/ioutil"
    24  	"os"
    25  
    26  	"github.com/ethereumproject/go-ethereum/common"
    27  	"github.com/ethereumproject/go-ethereum/core/vm"
    28  )
    29  
    30  // Version is the application revision identifier. It can be set with the linker
    31  // as in: go build -ldflags "-X main.Version="`git describe --tags`
    32  var Version = "unknown"
    33  
    34  var versionFlag = flag.Bool("version", false, "Prints the revision identifier and exit immediatily.")
    35  
    36  func main() {
    37  	flag.Parse()
    38  	if *versionFlag {
    39  		fmt.Println("disasm version", Version)
    40  		os.Exit(0)
    41  	}
    42  
    43  	code, err := ioutil.ReadAll(os.Stdin)
    44  	if err != nil {
    45  		fmt.Println(err)
    46  		os.Exit(1)
    47  	}
    48  	code = common.Hex2Bytes(string(code[:len(code)-1]))
    49  	fmt.Printf("%x\n", code)
    50  
    51  	for pc := uint64(0); pc < uint64(len(code)); pc++ {
    52  		op := vm.OpCode(code[pc])
    53  		fmt.Printf("%-5d  %v", pc, op)
    54  
    55  		switch op {
    56  		case vm.PUSH1, vm.PUSH2, vm.PUSH3, vm.PUSH4, vm.PUSH5, vm.PUSH6, vm.PUSH7, vm.PUSH8, vm.PUSH9, vm.PUSH10, vm.PUSH11, vm.PUSH12, vm.PUSH13, vm.PUSH14, vm.PUSH15, vm.PUSH16, vm.PUSH17, vm.PUSH18, vm.PUSH19, vm.PUSH20, vm.PUSH21, vm.PUSH22, vm.PUSH23, vm.PUSH24, vm.PUSH25, vm.PUSH26, vm.PUSH27, vm.PUSH28, vm.PUSH29, vm.PUSH30, vm.PUSH31, vm.PUSH32:
    57  			a := uint64(op) - uint64(vm.PUSH1) + 1
    58  			fmt.Printf("  => %x", code[pc+1:pc+1+a])
    59  
    60  			pc += a
    61  		}
    62  		fmt.Println()
    63  	}
    64  }