package chain import ( "fmt" "math/big" "github.com/ethereum/go-ethereum/ethutil" "github.com/ethereum/go-ethereum/vm" ) func Disassemble(script []byte) (asm []string) { pc := new(big.Int) for { if pc.Cmp(big.NewInt(int64(len(script)))) >= 0 { return } // Get the memory location of pc val := script[pc.Int64()] // Get the opcode (it must be an opcode!) op := vm.OpCode(val) asm = append(asm, fmt.Sprintf("%04v: %v", pc, op)) switch op { 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: pc.Add(pc, ethutil.Big1) a := int64(op) - int64(vm.PUSH1) + 1 if int(pc.Int64()+a) > len(script) { return } data := script[pc.Int64() : pc.Int64()+a] if len(data) == 0 { data = []byte{0} } asm = append(asm, fmt.Sprintf("%04v: 0x%x", pc, data)) pc.Add(pc, big.NewInt(a-1)) } pc.Add(pc, ethutil.Big1) } return asm }