<Kena>
I'm a beginner, I'm not aware of all the jargon.
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<ifreund>
least significant bit
<Kena>
fengb, I'm planning to watch your youtube video regarding to memory allocators. Do you think it's still relevant in spite of it was published several months ago?
<ifreund>
yes it is
<Kena>
Thanks ifreund
<Kena>
The function now works but the initial goal was to learn alignment mechanism because I'm trying to read RISCV-V Assembly Language by Anthony J. Dos Reis. I regret nevertheless that Zig assumes the byte as the smallest addressable unit. It would have been nice to work with embedded devices and micro-controllers in Zig.
<ifreund>
you totally can
<Kena>
Verilog is C-syntax derived after all so Zig could have compete for a sort of backed for Hardware Description Language.
<Kena>
Really?
<Kena>
s/backed/back-end
<ifreund>
anything c can do zig can (or will be able to) do
<Snektron>
Kena: there are pointers to values which have bit offsets
<Snektron>
packed structs would also get you quite far (if they worked)
<ifreund>
they work great if you just fill them up with bools
<Snektron>
anything that results in byte aligned units
<Kena>
Allright :)
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<teratorn_>
hi all, anyone want to take a stab why my len variable is getting corrupted and printing a really big number? http://0x0.st/in3-.zig
<andrewrk>
damn the CI is erroring again
<teratorn_>
how can i find the asm code that corresponds to dereferencing out_len var? on godbolt.org??
<a92>
Godbolt is one good way, yes
<g-w1>
could it be returning 1 exit code because of the thing you added to fix the self-hosted compiler returning 0 if there were compile errors andrewrk?
<andrewrk>
g-w1, in this case it would be printing a compile error as well
<g-w1>
although it is weird that its only on sourcehut
<teratorn_>
a92, but how to isolate that specific asm code?
<a92>
I think Godbolt shows association; mouse over the assembly
<g-w1>
it has -Dskip-compile-errors, could that be triggering it?
<andrewrk>
g-w1, that skips the tests that cause compile errors and check the output; it does not silence stderr
<g-w1>
ah that is what i though.
<travv0>
teratorn_: the long series of letters and digits is your hexadecimal output from the while loop, not your length
<travv0>
if you put a newline after your length output it'll show what you'd expect
<teratorn_>
fugggggg
<teratorn_>
travv0, good catch
<travv0>
:P
<travv0>
lol it took me a few to figure it out
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<teratorn_>
great help here lol
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<teratorn>
want to just write my code for me it will go faster
<travv0>
if it's an interesting enough project :P
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<drefr3>
Hi. I want to ask why std.math.absCast use~@bitCast(Uint, x +% -1) instead of @bitCast(Uint, -%x) to get the abs of int?
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<daurnimator>
drefr3: corner cases around i0/i1 IIRC.
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<justin_smith>
for example, for signed byte the range is -128,127, asking for the negation of -128 would be an error (or require upgrade to a larger bit count)
<justin_smith>
absCast only takes ints, but I don't have that range memorized
<daurnimator>
justin_smith: we do upgrade it
<daurnimator>
justin_smith: absCast returns an unsigned integer with the same number of bits as the passed integer.
<justin_smith>
'm looking at old code, or misunderstanding the code, in that case...
<daurnimator>
unsigned you get an extra bit :)
<justin_smith>
but the math is done before the upgrade
<daurnimator>
yes. but it's done with wraparound arithmetic; and then a bitcast
<daurnimator>
The key reason it's written the way it is, is so that `@as(i1, -1)` becomes `@as(u1, 1)`
<justin_smith>
daurnimator: right, wraparound arithmatic is safe, negation isn't
<justin_smith>
where il is signed int and ul as unsigned int?
<daurnimator>
justin_smith: yes.... that's what the `i` and `u` mean in zig
<justin_smith>
daurnimator: I assumed the 'l' was long, which absCast can't process
<justin_smith>
oh, I see "Integer" isn't a specific width, it's an integral value of any number of bits
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<drefr3>
thanks, daurnimator. But I notice that -%x still work while the type is i0/1: in the case of i1, -1, and -%(-1) = -1(1, in binary) after @bitCast to Uint, we get 1.
<drefr3>
and tests still pass
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<drefr3>
in the case of i0, i0 can only represent 0, so if(x<0){...} won't be executed
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<daurnimator>
justin_smith: there was no l; you might need a font that makes it easier to disambiguate i,1,l,I :)
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<Core3159>
daurnimator, how do you think about it? Please correct me if i am wrong
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<Core3159>
em.. I'm drefr3
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<Kena>
Hello, when I try to build `const file = try std.fs.cwd().createFile("my_file.txt", .{ .read = true });` I got `error: expected type 'void', found 'std.fs.file.OpenError'`
<alexnask[m]>
Your function does not return an error union, just void
<Kena>
But OpenError is an Error set, how can I know the error value?
<alexnask[m]>
Make it !void
<alexnask[m]>
This is a confusing error message though I thought someone had fixed it a while ago :/ Probably just in specific circumstances
<hch>
how to pass args from cli to my main function?
<marler8997__>
grep for argsAllocator
<g-w1>
std.process.argsAlloc
<hch>
thanks
<g-w1>
it seems std.process.args() is better if you just want to iterate through them
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<hch>
that was helpful. the WASI section actually has an example
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<marler8997__>
ifruend, it looks like kakoune doesn't work on windows?
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<waleee-cl>
marler8997__: not even the builtin-ui branch?
<waleee-cl>
ah, right, "no native Windows version is planned"
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<yZ5vlALg86lP>
is there somehow an example how to link some parts of a project into a static library and then link that static lib to one of the final executables? looking at build.zig, but its not immediately obvious
<Nypsie[m]>
Wouldn't it be better to directly use exe.addPackage() (If it's a Zig library)?
<yZ5vlALg86lP>
no actually the static lib is made of .c files
<Nypsie[m]>
Got it :)
<yZ5vlALg86lP>
but i did not specify that in my original question.
<Nypsie[m]>
Oh no worries. Now you know both ways if you'd create a Zig library :)
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<yZ5vlALg86lP>
this leads me to the question how to pass a bunch of c files to this addstaticlibrary()?
<Nypsie[m]>
lib.addCSourceFile()
<yZ5vlALg86lP>
in which case lib is the object that is returned by addstaticlibrary?
<Nypsie[m]>
Correct
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<yZ5vlALg86lP>
huh i get: > error: no member named 'addLibrary' in struct 'std.build.LibExeObjStep'
<g-w1>
will there ever be a comptime debugger?
<g-w1>
because right now gdb gets very confused when i try to use comptime stuff in it
<Nypsie[m]>
Hmm don't think so?
<Nypsie[m]>
Since the logic lives inside the compiler I guess
<g-w1>
will the compiler ever support it, i guess my question was
<Nypsie[m]>
Would be great, but I don't think it will
<Nypsie[m]>
Using @compileLog/Error is quite limited, I agree :P
<Nypsie[m]>
yZ5vlALg86lP: Use `exe.addObject(your_static_library_result_here)`
<Nypsie[m]>
or `linkLibrary`
<Nypsie[m]>
(which is being called by the above function)
<g-w1>
my use case was trying to view comptime arguments to a function at runtime. maybe the compiler/debugger could be smart enough to fill in the comptime args in the debuginfo
<yZ5vlALg86lP>
thx Nypsie[m] !
<Nypsie[m]>
g-w1: Aaah I see. I do believe though, that Stage 2 emits its own Dwarf files (which DWARF already supports I believe). However, that would also mean gdb needs to update their dwarf stuff.
<Nypsie[m]>
So maybe in stage2 that particular use case might just work
<alexnask[m]>
Yes it should be possible
<g-w1>
thats cool!
<TheLemonMan>
andrewrk, did you like the @setScopeOptions proposal? *finger guns*
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<marler8997__>
TheLemonMan, why was that issue closed?
<marler8997__>
I mean PR
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<TheLemonMan>
marler8997__, I fixed the unrolling problem in another PR
<marler8997__>
ok
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<hch>
is there atoi or simiar?
<frmdstryr>
std.fmt.charToDigit
<Nypsie[m]>
`std.fmt.parseInt`
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<Ristovski>
std docs still on 0.6.0 :(
<g-w1>
iirc they have to manually be updated
<Ristovski>
indeed, automation of that is on some todo iirc
<ikskuh>
huh
<ikskuh>
std.os.write triggers EFAUL
<ikskuh>
*EFAULT which is marked unreachable
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<Kena>
fengb I'm grateful for your "What's a memory allocator anyway?" video, you're brilliant dude.
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<Kena>
I hope you'll plan a round 2 or even an addendum to talk in more details about segments of memory on top/bottom of the buffer tactics, the benefits of using swapping into global space and the buffer overrun workaround consisting in writing in a additional buffer!
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<fengb>
Thanks
<fengb>
That talk was stretching my knowledge already :P
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<Kena>
You made me laugh when you declared that was a topic with which you're not particularly familiar with ^^ I wonder what your streams look like when you tame the topic.
<andrewrk>
TheLemonMan, gonna have to get back to you on that, I'm moving today
<andrewrk>
the good news is I'll be done and all set up with my own office by this weekend :)
<TheLemonMan>
no problemo, good luck with the move heh
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<Core3159>
Hello. math.absCast use ~@bitCast(....., x+% -1). but I think @bitCast(.....x-%1) works too. am I wrong
<Core3159>
sorry . I mean @bitCast(...,-%x)
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<justin_smith>
daurnimator: that reminds me of our convo yesterday - the case of 1 bit is the easiest example of what I was saying - the operation is done before the bitcast, x * -1 won't have the right answer for the minimum possible signed int (easiest to see the problem with 1 bit, but you get a similar problem with any bit count)
<fengb>
I definitely did not know anything about allocators before Zig
<Kena>
Did you implement randomizing pages for zee-aloc?
<Kena>
My bad, you do use slab instead of pages, so there is no overlapping data segments.
<Kena>
I wonder why did you stop its development, neither why nobody jumped in to help you as it is a public repository.
<fengb>
I have a slab branch and it works
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<fengb>
But it’s an extra 500 bytes in size so I haven’t merged it in yet
<fengb>
Also haven’t run tests to prove it’s faster either
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<Kena>
Understood :) I hope you'll achieve some progress on your project, as WebAssembly could gain some traction if and/or when emscripten is stabilized.