<< 14-11-2016 >>
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12:03:06SalewskiAraq, I have created next nimsuggest issue, one that creates a nimsuggest crash due to a typing error:
12:03:09Salewskihttps://github.com/nim-lang/nimsuggest/issues/40
12:03:24SalewskiI hope you can at lest reproduce it.
12:05:07Araqno --port PR?
12:05:47Araqlooks like I can push that right into my test suite, thanks a lot
12:09:52SalewskiBye...
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13:37:22arnetheduckAraq, in ccgtypes.getObjectInfo, field info is not generated for c++ types... any idea why it's generated for other imported types?
13:45:36flyxAraq: can you look over https://github.com/nim-lang/Nim/pull/5009 again soon? I recognized another error concerning daylight saving time and want to fix it after this PR gets merged
13:46:48flyxAraq: a comment on https://github.com/nim-lang/Nim/pull/4874 would also be nice so I can improve that
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14:05:46chemist69why does `var s = ""; echo s[0]` not give an 'index out of bound' error?
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14:14:35zevlgs[0] is valid '\0' char, is not it ?
14:17:03chemist69it just feels weird that I can extract the first element although the length is zero.
14:18:25flyxstrings are 0-terminated.
14:18:36flyxso it is always safe to access s[s.len]
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14:25:52chemist69ok, thanks.
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15:42:54Araqflyx: what kind of comment do you want? ;-) I said it's "convoluted"
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15:47:50Araqarnetheduck: because accessing private fields in C++ causes errors
15:47:58AraqC has no private fields.
15:54:46arnetheduckAraq, well, I changed it ;) instead of private fields, c has macro tricks where x->yyy is actually transformed to x->zzz.ttt and the like which messes with offsetof, and suddently lots of tests went green: https://github.com/nim-lang/Nim/pull/5018
15:56:05arnetheduckmy question was actually the other way around.. why would it be useful to generate field info for imported types (not why it's hard to do it for c++)?
15:57:08arnetheduckthe test suite works fine without it, but it's not like those parts are rigorously and methodically tested...
16:00:43Araqwell the clean solution is to embrace incompleteCstruct or whatever it's called
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16:01:33Araqso it's clearly communicated "compiler, we fucked it up, you cannot generate RTTI"
16:01:47Araqwhich btw affects the assignment operator too
16:01:58Araqincomplete structs cannot be copied
16:04:20arnetheduckhm that seems to be used only when the c type is an incomplete struct (like FILE)
16:04:38arnetheduckie when even the c compiler doesn't know the layout
16:05:32Araqhmm
16:06:53Araqbtw I now have the same problem as you. object type aliases cause a copy, not good :-)
16:07:36Araqquestion is whether we introduce tyAlias or simply make both types 'sym' field point to the same Symbol
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16:10:53arnetheduckthe latter will prevent some ast analysis and possibly render error messages less intuitive, I'd venture to guess
16:11:00arnetheduckie it drops information
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16:16:22arnetheduckwith either, you could get rid of large parts of the uniquedtype stuff simply by always skipping to the most raw definition.. nlvm does none of that stuff, but suffers from excessive casting because it cannot tell if two types alias
16:16:51Araqin my branch I removed uniqueType, yes
16:17:22Araqreplaced it by type signatures
16:17:42arnetheducklike.. mangled names?
16:18:13Araqyeah, but I hash everything to keep the mangled names short
16:19:23arnetheduckin c gen or earlier?
16:19:30AraqI like to use this mechanism later in the frontend too to determine type equality
16:19:40Araqright now it's backend only
16:21:32arnetheduckwell, tbh, I suspect backend can do without it by adding a few casts here and there, trusting that sem has done its work.. that's what nlvm does and I don't see why c gen should be different in this regard
16:22:16AraqI don't know when to generate these casts
16:22:28Araqand it seems an ugly solution
16:22:56arnetheduckno, but ast does .. whenever parent and child disagree, essentially.. mostly happens with arg passing
16:25:46flyxAraq: you said you don't like staticReadEx as name, so I wonder how you would like the procs to be named
16:27:19arnetheduckhttps://github.com/arnetheduck/nlvm/blob/master/nlvm/llgen.nim#L1435 - used with function calls and binops, that's it
16:28:42arnetheduckif type aliases are know, even that should go away I think...
16:29:00arnetheduckoh well, bbl.. +1 for tyAlias
16:36:00Araqflyx: slurpOutputAndExitCode ... meh
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16:52:06Araqflyx: staticReadEx is fine, cannot come up with something better
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16:53:27Araqarnetheduck: btw your code is full of duplications, use more templates :-)
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19:02:48corecodecan a template that creates a proc add a (custom) documentation comment? i guess i need to check it out
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19:03:49Araqnah, you need a macro for that, I think
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19:03:57corecodeokay
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19:04:16Araqthere is no substitution mechanism for comments
19:04:43AraqI would write the comment in a general fashion instead :P
19:04:59corecodethis is for generated code
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19:05:14Araqyes, I got it.
19:05:20corecodeconverting xml that describes memory-mapped hardware registers into accessor procs
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19:05:46corecodei thought about adding the "description" node as documentation comment
19:05:56Araqwhy would I want to read 10x the same comment?
19:06:06corecodeyea you wouldn't
19:06:15Araqor slightly variations of the comment for that matter
19:07:06Araqproc getFoo(): Foo ## Get the foo.
19:07:15corecodelolno
19:07:22Araq--> just leave it out instead :P
19:08:17corecodemore like proc ALERT(r: CR1type): bool ## SMBus alert; proc PEC(r: CR1type): bool ## Packet error checking
19:11:10Araqah, so the doc comment is in the XML?
19:12:17corecodethe content comes from the xml
19:12:26corecodei'm still playing with the interfaces
19:13:04corecodehow to do abstract memory-mapped register access
19:13:17corecodeand how this API is generated
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19:22:23FromGitter<kteza1> Is there any documentation which clearly tells the difference between `var` for creating a variable and `var` in proc parameters?
19:29:06flyxkteza1: http://nim-lang.org/docs/manual.html#statements-and-expressions-var-statement http://nim-lang.org/docs/manual.html#procedures-var-parameters
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19:33:54SalewskiVar for creating a variable, and var for proc parameters are fully unrelated and have nothing in common I think.
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19:34:34SalewskiBoth is from Pacal family -- as keyword static in C which is used with totally different meanings.
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19:41:23FromGitter<kteza1> Salewski: When I was a C beginner, I found static very confusing. Why didn't nim go with a different keyword here? @dom96 Maybe this point should be stressed in Nim In Action? I couldn't recollect reading about this
19:41:27SalewskiOK, when thinking about it, both indicate a nutable value
19:42:19SalewskiIt is bad to waste too many keywords
19:44:45SalewskiAnd it is from Pascal family and makes sense in the sense of mutable. But still both is very different.
19:45:48SalewskiBye...
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20:22:47yglukhovCan macro be somehow limited on node kinds it can be applied to during overload resolution?
20:28:28Araqyglukhov: yes indeed, via type parameter constraints
20:29:01Araqmacro m(a: typed{lit})
20:30:16Araqkteza1: I never found a better keyword for it, plus you need to pass a variable to a 'var T' param, so it makes lots of sense
20:30:27AraqI also liked the ptr/ref/var trinity
20:31:40yglukhovAraq: theres smth wrong with this code: macro toBson*(x: untyped{nnkTableConstr}): Bson = ...
20:31:53yglukhovError: Error: illformed AST: nnkTableConstr
20:32:15Araqtry nkTableConstr instead
20:32:33Araqor just TableConstr, I don't remember, check the manual
20:33:35yglukhovAraq: got it. that moved me a bit further. thanks.
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20:45:53FromGitter<kteza1> Araq: Ok. Thanks :). This might be one of the frequent confusing concepts for newbies. Better documentation explaining the differences would be great
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20:50:33corecodeVM is not allowed to 'cast' :(
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21:02:19Araqcorecode: what do you do at compile-time? :-)
21:02:40Araqcheck my lexim project of how to use staticExec for much faster compiletime voodoo
21:02:44corecodetrying to learn nim :)
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22:44:02shashlickhello all
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22:51:55Araqhi shashlick welcome
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22:54:04shashlickhello Araq - honored :)
22:55:39shashlickI'm new to Nim, still twiddling around to find my way, but find it very interesting
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