Brian Paul wrote:
> Keith Whitwell wrote:
>> Micha? Król wrote:
>>> On 17/05/07, Brian Paul <[EMAIL PROTECTED]> wrote:
>>>> Ian Romanick wrote:
>>>>> Is there an easy way in this parser generator to change the grammar for
>>>>> the TXP instruction? Basically, I want it to be invalid to use TXP
>>>>> with
>>>>> the SHADOWARRAY2D target.
>>>> Michael would have to answer that. Michael?
>>>>
>>> I will look at it tomorrow.
>>>
>>>>> Alternately, is there a reason we're using this instead of lex & yacc?
>>>> I think Michael just used what was familiar to him.
>>>>
>>>>
>>>>> I used lex & yacc to write a unified parser for another project that
>>>>> handles ARB_{vertex,fragment}_program (up to vp3 and fp2), the various
>>>>> NV vertex and fragment programs, and ATI_text_fragment_shader. I could
>>>>> probably adapt it to work with Mesa without too much trouble.
>>>>>
>>>>> Opinions?
>>>> I guess I'd prefer using standard tools like lexx and yacc. Though, I'd
>>>> do research to see if there's anything newer/nicer nowadays.
>>>>
>>> If my memory serves me right, there was at least one attempt in the
>>> past to kill off those syn files, but they are still alive to this
>>> day.
>>>
>>> Ian, if this is no problem for you, feel free to replace it with yacc
>>> grammars, just please keep the old ones #ifdefed for a while, if
>>> possible. The reason I used custom grammar in the first place was that
>>> I wasn't aware of any (not only open source) compiler-compiler (lack
>>> of Internet!) so I just invented one.
>>>
>> I think the Zack/Roberto LLVM tree has done just this. Unfortunately
>> for this immediate problem, they target a whole new intermediate
>> representation.
>
> Zack, what tools did you use for the front-end/parser? I've been
> looking over LLVM but I haven't seen any sign of a parser generator.
In fact I think they've used Roberto's QLALR compiler-generator, which
in itself raises some issues about licensing.
QLALR is GPL'ed, what is the GPL-status of the sources it generates??
If they are GPL, that's a problem...
Keith
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