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Groups > comp.lang.c > #167163
| From | Keith Thompson <Keith.S.Thompson+u@gmail.com> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: How to optimize this search? |
| Date | 2022-08-23 13:40 -0700 |
| Organization | None to speak of |
| Message-ID | <87sflmy9qx.fsf@nosuchdomain.example.com> (permalink) |
| References | (1 earlier) <868rneuco0.fsf@linuxsc.com> <93c78669-e681-48bf-b421-ff199e5fcf7an@googlegroups.com> <d4424f70-b00d-4102-89b3-6e151cc54aa3n@googlegroups.com> <87wnayydld.fsf@nosuchdomain.example.com> <376a7c64-113a-46d3-bc81-664a6b7dd32cn@googlegroups.com> |
bart c <bart4858@gmail.com> writes:
> On Tuesday, 23 August 2022 at 20:17:18 UTC+1, Keith Thompson wrote:
[...]
>> And that's a *lot* of "define"s. It sounds like the code you're
>> looking at is not typical. Your numbers don't match what I see
>> in the latest sqlite3 sources.
>
> Yeah, that looked dodgy. I don't know what's going on there. If I
> compile only sqlite3.c, then I get more reasonable looking figures:
>
> 14010 define
> 08728 if
> 08543 int
> 03115 endif
> 03111 return
> 02658 void
> 02291 else
>
> Note that 10,000 of those defines are inside my windows.h. Also note
>that the same 'if' keyword is used for "'#if".
>
> This is specific to normal C however. We don't know exactly what the
> OP is doing, or what his inputs will be, whether they are already
> preprocessed or not.
Ah, so that's 14010 occurrences of "define" after preprocessing.
Except that after preprocessing there shouldn't be *any* occurrences of
"define" that result from macro definitions ("define" could be used as
an ordinary identifier). And if you're distinguishing between keywords
like "int" and identifiers like "foo" before translation phase 7, there
are likely to be some programs that you'll handle incorrectly. You
certainly don't have to implement the 8 translation phases as distinct
passes, but if you want a conforming implementation you must do
something that acts that way.
This:
#if int
#error "Error 1"
#endif
#if foo
#error "Error 2"
#endif
shouldn't produce any error messages.
The point is that if you're processing C source code and recognizing
whether tokens that look like identifiers are keywords or not, it
doesn't make sense to have "define" and "int" in the same table.
--
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
Working, but not speaking, for Philips
void Void(void) { Void(); } /* The recursive call of the void */
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Re: How to optimize this search? antispam@math.uni.wroc.pl - 2022-08-23 23:54 +0000
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