67 lines
1.9 KiB
Go
67 lines
1.9 KiB
Go
// Copyright 2014 The go-ethereum Authors
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// This file is part of go-ethereum.
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//
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// go-ethereum is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// go-ethereum is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
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package core
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import (
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"fmt"
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/vm"
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)
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func Disassemble(script []byte) (asm []string) {
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pc := new(big.Int)
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for {
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if pc.Cmp(big.NewInt(int64(len(script)))) >= 0 {
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return
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}
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// Get the memory location of pc
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val := script[pc.Int64()]
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// Get the opcode (it must be an opcode!)
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op := vm.OpCode(val)
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asm = append(asm, fmt.Sprintf("%04v: %v", pc, op))
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switch op {
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case vm.PUSH1, vm.PUSH2, vm.PUSH3, vm.PUSH4, vm.PUSH5, vm.PUSH6, vm.PUSH7, vm.PUSH8,
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vm.PUSH9, vm.PUSH10, vm.PUSH11, vm.PUSH12, vm.PUSH13, vm.PUSH14, vm.PUSH15,
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vm.PUSH16, vm.PUSH17, vm.PUSH18, vm.PUSH19, vm.PUSH20, vm.PUSH21, vm.PUSH22,
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vm.PUSH23, vm.PUSH24, vm.PUSH25, vm.PUSH26, vm.PUSH27, vm.PUSH28, vm.PUSH29,
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vm.PUSH30, vm.PUSH31, vm.PUSH32:
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pc.Add(pc, common.Big1)
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a := int64(op) - int64(vm.PUSH1) + 1
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if int(pc.Int64()+a) > len(script) {
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return
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}
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data := script[pc.Int64() : pc.Int64()+a]
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if len(data) == 0 {
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data = []byte{0}
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}
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asm = append(asm, fmt.Sprintf("%04v: 0x%x", pc, data))
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pc.Add(pc, big.NewInt(a-1))
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}
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pc.Add(pc, common.Big1)
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}
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return asm
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}
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