Dnia 19-08-2008 o 12:57:04 Davy <[EMAIL PROTECTED]> napisał:
> I am learning to write a assembly language parser.
> The assembly format is like:
> MOV R1, 0 //R1 = 0
> ADD R2, R3, R4 // R2 = R3 + R3
>
> The question is, how to define the comma (,) between registers? Shall
> I define it as token or literals or something else?
>
> Any suggestion are welcome:)
I think that this is up to you.
I personally will do somethink like this:
t_COMMA = ","
t_MOV = "mov"
t_REGS = "R[0-4]+"
t_NUM = "[0-9]+"
...
def p_mov(t):
'''mov : REGS COMMA NUM
| REGS COMMA REGS'''
...
def p_add(t):
'''add : REGS COMMA REGS COMMA REGS'''
...
But as far as I know ADD work in other way:
mov eax, 123h
mov ebx, 12h
add eax ; eax = eax+ebx
regards,
Marek
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