cmd/disasm, cmd/evm: integrate disasm tool into evm tool. (#3729)

1 files changed, 53 insertions, 0 deletions

diff --git a/cmd/evm/disasm.go b/cmd/evm/disasm.go
new file mode 100644
index 000000000..01a8c60ba
--- /dev/null
+++ b/cmd/evm/disasm.go
@@ -0,0 +1,53 @@
+// Copyright 2017 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/>.
+
+package main
+
+import (
+	"errors"
+	"fmt"
+	"io/ioutil"
+
+	"github.com/ethereum/go-ethereum/core/asm"
+	cli "gopkg.in/urfave/cli.v1"
+	"strings"
+)
+
+var disasmCommand = cli.Command{
+	Action:    disasmCmd,
+	Name:      "disasm",
+	Usage:     "disassembles evm binary",
+	ArgsUsage: "<file>",
+}
+
+func disasmCmd(ctx *cli.Context) error {
+	if len(ctx.Args().First()) == 0 {
+		return errors.New("filename required")
+	}
+
+	fn := ctx.Args().First()
+	in, err := ioutil.ReadFile(fn)
+	if err != nil {
+		return err
+	}
+
+	code := strings.TrimSpace(string(in[:]))
+	fmt.Printf("%v\n", code)
+	if err = asm.PrintDisassembled(code); err != nil {
+		return err
+	}
+	return nil
+}