func PrintOp()

in internal/compile/compile.go [861:901]

• 38 lines of code
• 12 McCabe index (conditional complexity)

func PrintOp(fn *Funcode, pc uint32, op Opcode, arg uint32) {
	if op < OpcodeArgMin {
		fmt.Fprintf(os.Stderr, "\t%d\t%s\n", pc, op)
		return
	}

	var comment string
	switch op {
	case CONSTANT:
		switch x := fn.Prog.Constants[arg].(type) {
		case string:
			comment = strconv.Quote(x)
		case Bytes:
			comment = "b" + strconv.Quote(string(x))
		default:
			comment = fmt.Sprint(x)
		}
	case MAKEFUNC:
		comment = fn.Prog.Functions[arg].Name
	case SETLOCAL, LOCAL:
		comment = fn.Locals[arg].Name
	case SETGLOBAL, GLOBAL:
		comment = fn.Prog.Globals[arg].Name
	case ATTR, SETFIELD, PREDECLARED, UNIVERSAL:
		comment = fn.Prog.Names[arg]
	case FREE:
		comment = fn.Freevars[arg].Name
	case CALL, CALL_VAR, CALL_KW, CALL_VAR_KW:
		comment = fmt.Sprintf("%d pos, %d named", arg>>8, arg&0xff)
	default:
		// JMP, CJMP, ITERJMP, MAKETUPLE, MAKELIST, LOAD, UNPACK:
		// arg is just a number
	}
	var buf bytes.Buffer
	fmt.Fprintf(&buf, "\t%d\t%-10s\t%d", pc, op, arg)
	if comment != "" {
		fmt.Fprint(&buf, "\t; ", comment)
	}
	fmt.Fprintln(&buf)
	os.Stderr.Write(buf.Bytes())
}