<teratorn>
can someone try to reproduce this hanging "bench" test? http://0x0.st/inVC.zig
<teratorn>
if you reduce the for-loop count to 1000 it works fine
<teratorn>
am i exploding an arraylist? and maybe the hash algo is putting them in the same bucket?
<teratorn>
windbg says in in a Wyhash function
<frmdstryr>
time per 10,000: 230.5134ns
<frmdstryr>
It is doing a ton of allocations
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<teratorn>
frmdstryr, well that would be expected
<teratorn>
but why the performance fall off?
<teratorn>
the hashmap and arraylists dont appear to be exploding
<teratorn>
and it doesnt peg cpu or mem usage
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<frmdstryr>
on linux it's not hanging and pegging one core at 100%
<frmdstryr>
memory goes up to about ~400MB
<frmdstryr>
teratorn: Did you try running in release-safe? A profiler shows its in zig_assert
<teratorn>
no
<frmdstryr>
it runs really quick with release safe
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<g-w1>
andrewrk: sorry to ping you about this but i spent a very long time trying to figure this out and no one else seems to know: in type.zig, how would I extract fields from a type.Type.Payload.ErrorSet? only the value.Value.Payload.ErrorSet has fields. I tried to do this but it didn't work: var a_fields = @fieldParentPtr(TypedValue, "ty", &a).val.cast(Value.Payload.ErrorSet).?.fields; (this is in the context of
<g-w1>
trying to impliment type equality checking for error sets/error unions) ~type.zig:229. thanks so much
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<andrewrk>
uhh no @fieldParentPtr here, not sure where that's coming from.
<g-w1>
I thought that `a` was a type that had a corresponding val that shared a TypedValue.
<g-w1>
Since only the val has fields, how else would you find the fields?
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<andrewrk>
you're talking about error { these, fields } right?
<g-w1>
yes, I am trying to compare 2 error sets, but to compare them I need to know the fields, right?
<andrewrk>
those fields are part of the error set type, so you'll get them through the Type, not through a Value
<g-w1>
the Type.Payload.ErrorSet only has decl, should I look for it there? in the typed_value of the decl?
<andrewrk>
for me to answer this question is the same thing as writing the code - I don't know until I try it
<g-w1>
ok :) ill try there
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<teratorn>
whats the diff between [*]u8 and []u8 and how do I get the former from the latter?
<g-w1>
thanks for being a rubber duck. in analyzeInstErrorSet -> createAnonymousDecl there is an anon struct creation of a TypedValue. the anonymous struct is what tripped me up. im so happy that i figured this out
<g-w1>
teratorn: [*]u8 is basically a c poiinter but you are telling zig that it has multiple items. I would reccomend the zig showtime talk by loris about pointers. he goes in-depth on how to convert all the types and what they are. its very good
<g-w1>
for reference, this is the code that got it: a.cast(Payload.ErrorSet).?.decl.typed_value.most_recent.typed_value.val.cast(Value.Payload.ErrorSet).?.fields;
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<marler8997__>
is there some way to tell at comptime if we are compiling with tests enabled?
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<daurnimator>
marler8997__: yes, look in builtin
<marler8997__>
thanks @import("builtin").is_test seems to work
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<daurnimator>
marler8997__: never import builtin directly; use `std.builtin`
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<teratorn>
what's the canonical way to compare two memory buffers ([]u8) ?
<teratorn>
for a unit test
<scientes>
mem.eql
<scientes>
but style questions are generally a waste of time
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<teratorn>
how about printing binary data with escapes?
<scientes>
somewhere in fmt
<scientes>
not sure if fmt has nidce documentation, but that would be nice
<ikskuh>
teratorn: you want to print a byte buffer as escaped ASCII or as hexadecimal?
<teratorn>
either way
<ikskuh>
{x} or {X} for hexadecimal
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<Kena>
Hello living on the edge computional people. Does someone know why bool type is 1 byte-aligned instead of u1? There are 7 bits lost each type a boolean expression is evaluated, and therefore increase the software's latency.
<Kena>
*computational
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<hch>
does `zig cc` have sth similar to `(clang|gcc) -dumpmachine` ?
<ugla>
Kena: a byte is often the smallest addressable unit of memory
<ifreund>
also usize is probably the fastest type to opreate on as it fits exactly in a register or whatever
<Kena>
Allright but I thought Zig was able to compete against C for low-level software. I think ignoring reduced instruction set architecture target would be a mistake
<ifreund>
really though this is microoptimization, you won't know anything for sure without benchmarking
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<ifreund>
Kena: bools are u1 when in packed structs by the way
<Kena>
How could you replace a bool by a usize?
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<ifreund>
in general
<ifreund>
let the optimizer worry about that
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<ugla>
Kena: a standard C bool is the same size, for what it's worth
<ifreund>
infact
<ifreund>
urgh, in fact that's probably why zigs bool is one byte
<ifreund>
otherwise we would need c_bool
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<Sahnvour>
byte-sized bools also do not require additional bit shifting to be used with typical cpu instructions
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<g-w1>
is there a way to compare 2 array hash maps, or subtract one from another, without cloning anything
<teratorn>
.\amp.zig:384:5: error: variable of type 'comptime_int' must be const or comptime
<teratorn>
var i = 0;
<teratorn>
^
<teratorn>
.\amp.zig:385:12: note: referenced here
<teratorn>
while (i < len) : (i += 1)
<teratorn>
^
<teratorn>
whyyy
<g-w1>
var i: u32
<dutchie>
probably usize tbh
<dutchie>
but yeah
<dutchie>
top zig papercut
<teratorn>
why does it pick a bad type?
<alexnask[m]>
Integer literals are of type `comptime_int` because they can be arbitrarily large
<ikskuh>
teratorn: which type should it pick?
<teratorn>
i dunno something that works in a for loop
<Kena>
Please what is the Zig equivalent for CHAR _BIT in C? Is it u8?
<ikskuh>
Kena: it does not exist
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<ikskuh>
@bitSizeOf(c_char) would be the explicit equivalent i think?
<ikskuh>
oh, c_char doesn't exist :O
<ikskuh>
zig assumes that a byte is always the smallest adressable unit
<ikskuh>
thus, @sizeOf(u8) == 1 and @bitSizeOf(u8) == 8
<Kena>
Thank you buddy you're kind.
<fengb>
c_char might be added due to C ambiguities :P
<ikskuh>
c_char == u6
<ikskuh>
:D
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<Kena>
Please How can I get the size of the size of a declared variable? `@sizeOf()` `@sizeOf(TypeOf())``@bitSizeOf()` and @typeInfo().Int.bits return each an error who message is beyond me.
<ikskuh>
@sizeOf(@TypeOf(xyz))
<ikskuh>
is the size in bytes for a var named "xyz"
<Kena>
error: expected type 'std.builtin'.TypeInfo', found 'i8'
<ikskuh>
huh
<ikskuh>
can you show me the full source?
<g-w1>
does error {Thing} coerce to anyerror?
<ikskuh>
yes, it does
<g-w1>
but with @as(anyerror, error{Thing}) doesn't work. im implimenting more error stuff in stage2, should I make it castable?
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<ikskuh>
error{Thing} is a type
<ikskuh>
error.Thing is the error of type error{Thing}
<ikskuh>
sorry
<g-w1>
ok
<g-w1>
and error.Thing can coerce to anyerror?
<alexnask[m]>
error{Thing} is a type
<fengb>
Do you mean error.Thing?
<alexnask[m]>
yeah
<g-w1>
yes i think
<g-w1>
so error{Thing} can coerce to type anyerror?
<g-w1>
or error.Thing can coerce to anyerror. all these types that are also values are confusing me
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<marler8997__>
daurnimator, why "never import builtin directly; use `std.builtin`" ?
<ifreund>
iirc importing directly is deprecated?
<travv0>
whoops i always import it directly
<marler8997__>
I'm not seeing where it has been deprecated, and the zig docs still use it
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<dutchie>
one day i'll remember which commands want -OReleaseSafe and which ones want -Drelease-safe
<dutchie>
probably by then the CLI will have been tidied up so they are all consistent
<alexnask[m]>
-D is a way of passing options to build scripts
<alexnask[m]>
So -D<some_mode> is always a build.zig thing
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<tsujp>
Congrats on 0.7.0! I'm a bit late to the party but none the less splendid work
<tsujp>
Hey I have a Q and please direct me to the right place if this is too general or likely to be missed: I want to contribute to Zig but right now contributions directly to the language are not yet feasible (still learning Zig so I am a beginner/intermediate there); is the Zig website something that is in scope for a change etc?
<tsujp>
I am a fullstack dev and web designer so I'd be keen to contribute to some FOSS, of course free
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<yZ5vlALg86lP>
specifically why is there a Dir.deleteTree and also a deleteTreeAbsolute, why this distinction? why not have one fn that deletestree irrespective of the path being absolute or relative?
<yZ5vlALg86lP>
s/specifically//
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<g-w1>
deleteTreeAbsolute is just a wrapper. it doesn't take a dir as an arg
<travv0>
the non-absolute path functions will also take an absolute path
<g-w1>
it is basically equalalent to std.fs.cwd().deleteTree
<g-w1>
read the source
<ifreund>
it asserts that the path is absolute no?
<yZ5vlALg86lP>
i actually read the source. and it confused me, that's why i asked here
<yZ5vlALg86lP>
the confusing part is why does the non absolute version need the Dir as a first parameter, i mean, why expose this to the dev? why not handle this transparently?
<g-w1>
it is so that they can pass whatever dir they want, it may not always be cwd(). cwd().openDir("thing").deleteTree("other")
<yZ5vlALg86lP>
there could be a wrapper that checks the path being absolute, and if not instantiates a std.fs.cwd() instead
<g-w1>
what if you dont want to use cwd
<yZ5vlALg86lP>
then i concat the path with the prefix i want instead of cwd
<yZ5vlALg86lP>
paths are strings, even if relative
<g-w1>
i feel like that would 1. use allocation 2. be more complex than just chaining a bunch of openDir
<yZ5vlALg86lP>
how frequent is the case that the path is neither absolute nor relative to cwd?
<yZ5vlALg86lP>
i feel that this case is quite rare
<g-w1>
im pretty sure this is because of the way openat works at the system level: it needs a fd pub fn openat(dirfd: i32, path: [*:0]const u8, flags: u32, mode: mode_t) usize {
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<g-w1>
std/os/linux.zig:568
<travv0>
if you tend to mostly want paths relative to the cwd it seems fs.cwd().function() isn't a lot to type, and then it still allows people that need things relative to other directories to do that using the same function
<travv0>
i think the current workaround is to pass some sort of error context argument that you populate if there's an error, i haven't personally done anything like that though so i could be wrong
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<danyspin97_>
travv0: thanks, I'll use that
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<danyspin97_>
dominikh: I see, still heavily discussed
<danyspin97_>
I guess we'll see it in 0.9.0
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<travv0>
it's unfortunately not even accepted yet but i believe it's a really popular proposal. i certainly would like to see it happen
<ifreund>
danyspin97_: logging inside a library function is an intended use case for std.log
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<ifreund>
just put all of your library's logging in a custom scope
<danyspin97_>
ifreund: what about a module with some functions?
<danyspin97_>
I have 3 binaries that reuse the same modules
<danyspin97_>
I don't want to expose the module name to the user (just the error msg should suffice)
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<ifreund>
sure, do whatever makes sense
<ifreund>
there's no hard and fast rules because 1. zig isn't mature and 2. hard rules aren't flexible
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<g-w1>
to go back to my question from earlier, should @typeOf(error.Thing) == error {Thing, Other}. I do not think this is the case, but if not, what operation could i do to @typeOf(error.Thing) (error {Thing}) to turn it into error { Thing, Other }? (thinking about this from a compiler type coerction perspective). should I just merge it with the other set to create a new set? i cant find a cast about this in
<g-w1>
ir.cpp~15241 (where all the casts are) so I assume that @typeOf(error.Thing) == error {Thing, Other}? although this is not true when trying it out. could someone point me in the right direction of how the semantics of this should work please?
<g-w1>
or should it be an exception that if an error is returned from a function that @typeOf(error.TheErorr) is in the return error set (talking about defined error return sets) it will automatically coerce to the larger set, but only in this example?
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<teratorn_>
whats wrong with this syntax? stdout.print("here: {} {}", .{pair.key.len, pair.value.len}) catch |err|{};
<ifreund>
what's the error you get?
<teratorn_>
whats wrong with this syntax? stdout.print("here: {} {}", .{pair.key.len, pair.value.len}) catch |err|{};
<teratorn_>
.\amp.zig:38:74: error: expected token '}', found 'catch'
<ifreund>
ok, well that's not the same code you pasted in the first message
<ifreund>
cool :)
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<teratorn_>
could anyone tell me why the last test case is printing len: <value> with a really huge corrupted number, when it is supposed to be stored to as an out variable, and be 23... ?
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<teratorn_>
ifreund, how does that affect len?
<ifreund>
teratorn_: that line is UB, what it does is undefined
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<ifreund>
use a real buffer instead of just hoping that it's ok to write over whatever is at address 1
<ifreund>
var buf:
<ifreund>
var buf:[4096]u8 = undefined;
<teratorn_>
its an out var
<teratorn_>
it should be set to a real address later
<teratorn_>
make sense?
<ifreund>
oh well in that case use undefined to initialize it
<teratorn_>
ifreund, ok i do it. still same issue though
<ifreund>
I'm very confused why this function doesn't just return a slice
<teratorn_>
it will be exported to C which informs the design significantly
<ifreund>
well, you can't return an error union either in that case
<novaskell>
teratorn_: try writing it for zig first and consider how to wrap it for C after you've got it working correctly. Also, avoid `[*]` everywhere that's not touching C directly as it should only live at the edge between the two
<ifreund>
novaskell: you're thinking of [*c], [*] is totally fine to use in pure zig
<teratorn_>
its virtually complete already so its not really worth having two API layers
<teratorn_>
its a very simple protocol, and the api is straight forward
<ifreund>
and [*c] is only for autogenerated bindings, if you're writing manual bindings you should figure out the correct zig pointer type
<teratorn_>
but ill take that advise under advisement for the future
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<teratorn_>
ok, but the issue remains
<teratorn_>
why cant i seem to assign to a usize out var?
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<ifreund>
try throwing a print statement the loop in the function you're testing
<teratorn_>
maybe it overwriting the stack
<teratorn_>
im assigning to a buffer... i think just the pointer but maybe not?
<novaskell>
`[*]` given a length should be a slice `[]` inside as soon as practical/possible unless there's a specific reason to keep `[*]`