<Raito_Bezarius>
is there a way to perform coercion to bool from u8?
<Raito_Bezarius>
@bitCast ?
<Raito_Bezarius>
ah maybe @truncate
<Raito_Bezarius>
hm not really
<g-w1>
@boolToInt(b)
<g-w1>
you can then upcast that to u8
<Raito_Bezarius>
I wanted the inverse
<Raito_Bezarius>
u8 → bool
<Raito_Bezarius>
but I guess this is just "!= 0"
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<g-w1>
ah yeah
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<mattnite>
hey I'm getting a segfault when I try to run zig cc on a hello world C program. I haven't dug into it yet but it's coming from linkWithLLD, anyone see this before?
<g-w1>
what zig version?
<mattnite>
master
<mattnite>
I also forgot to mention that this is a stage 2 build
<g-w1>
can you post a backtrace please?
<g-w1>
does this happen with downloaded tarball, or only with built from source?
<Raito_Bezarius>
does replacing the default panic handler makes assert working out of the box?
<g-w1>
assert just calls unreachable, so i should iirc
<mattnite>
built from source brb
<Raito_Bezarius>
thanks, also: to replace it, should I only expose panic in main.zig?
<g-w1>
expose it in the root file of the compilation
<Raito_Bezarius>
I have some "const panic = serial.panic;" but it does not seem to be called in my root file of compilation (i.e; main.zig)
<Raito_Bezarius>
oh I didn't know I could built slices like this!
<g-w1>
oh wait, you cant use the .{ } syntax, but you can just set it to undefined, then do slice.ptr = ... slice.len = ...
<Raito_Bezarius>
yeah just got the error
<Raito_Bezarius>
so I ended up using andrewrk's solution :)
<Raito_Bezarius>
thanks for the alternative though g-w1 !
<g-w1>
i feel like the .{ } syntax should work as slices are just structs 🤔
<g-w1>
andrewrk: that stdlib stuff looks sick! Im working on removing frontend zir support right now to address the TODO
<g-w1>
should i also delete -femit-zir at the same time, or are you keeping that in as a TODO?
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<g-w1>
wow, stage2 is really coming along
<mattnite>
yeah I figured now would be the time to jump in while there's still work to be done
<mattnite>
compiler FOMO
<g-w1>
exactly i can't let other people steal all those easy TODOs
<andrewrk>
mattnite, there's another fun one I forgot to mention: make the C backend lower add,addmul,sub,submul better for signed/unsigned ints
<andrewrk>
there are 2 fun problems to solve: 1. implement wrapping integer arithmetic for signed ints in C, and 2. implement non-wrapping (UB) integer arithmetic for unsigned ints in C
<andrewrk>
g-w1, mm go ahead and delete it
<g-w1>
ok, ill add that to my pr :)
<andrewrk>
yagni
<mattnite>
hmm that does sound hella fun
<g-w1>
yagni means we wont need emit-zir?
<andrewrk>
for (2) you would think that you could just use +, -, like normal, and you'd be right, but we can do better, by communicating to the optimizer that wrapping would be UB :D
<mattnite>
might jump on that one first since I think it would be a quicker win
<andrewrk>
g-w1, yes
<g-w1>
ok thanks
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<g-w1>
ahh just looked up yagni, thought it was some slang, but it is actually some programming thing. til
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<andrewrk>
:)
<andrewrk>
yagni is a programming super power
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<g-w1>
working on private decls rn
<g-w1>
its fun to see the tests fail with the correct error
<g-w1>
decl.is_pub gets set wrong somewhere
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<g-w1>
ah seems for file scopes it is always false
<g-w1>
wait nvm, but something is wrong
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<andrewrk>
there are a few instances of // TODO check is_pub
<g-w1>
yeah, doing those, getting a panic here: /home/jacob/dev/zig/src/test.zig:203:38: 0x2ebff0 in Case.addError (test) const msg = it.rest()[1..]; // skip over the space at end of "error: "
<g-w1>
see anything wrong with this? &.{"2:25: error: 'print' is private"},
<g-w1>
i dont think errors have been tried with multi-file, maybe that is the problem?
<g-w1>
ooh, seems like a miscompilation type of thing where it compiles with invalid types
<andrewrk>
missing a colon in the front
<andrewrk>
can you make the test harness print a better message?
<g-w1>
oh interesting, then i guess &[_][]const u8 is not needed
<g-w1>
i can update the test harness, yes
<andrewrk>
":2:25: error: ..."
<g-w1>
ok, private errors support added
<g-w1>
i reabsed on stage2-start getting this? /home/jacob/dev/zig/src/test.zig:622:34: error: missing field: 'namespace_hash'. interestinly only on ./zig build test-stage2, but not on `ninja` 🤔
<g-w1>
ahh it has not been tested with the test runner lol
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<Raito_Bezarius>
given x and a mask, is there an easy way to do something like bool(x & mask) which is the bitwise and which returns true if all(a[i] & b[i]) and false otherwise?
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<ShockTohp>
do a[] and b[] contain distinc x's and masks or are you trying to get if x == mask bitwise?
<Raito_Bezarius>
I'm trying to do in C "(x & mask) ? then : else" where x and mask are the same length
<g-w1>
oh thats actually cool that it works like that
<g-w1>
it didn't prevent a bug in this case, but could have
<andrewrk>
TheLemonMan, I wasn't able to get it to repro with llc but we are hitting it in zig_llvm.cpp
<andrewrk>
I wonder what clang is doing that llc is not
<andrewrk>
mm maybe the cpu features
<g-w1>
you forgot a try stderr.print and i think you probably want to reset the tty bold before going to ttyconf.setColor(stderr, color);
<andrewrk>
huh did I forget to build?
<andrewrk>
whoops
<g-w1>
unless error: is supposed to be bold
<TheLemonMan>
hmm, try adding `-debug-pass=Arguments` to the clang invocation, that'll dump the set of optimization passes it uses
<andrewrk>
bold and color are exclusive, but also if you look closely the color is also bold
<g-w1>
ok, interesting
<andrewrk>
TheLemonMan, does llc accept -target-feature args somehow?
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<TheLemonMan>
andrewrk, -mattr
<andrewrk>
TheLemonMan, sorry I can't get llc to repro it
<andrewrk>
TheLemonMan, idk why you can't repro it, the assertion trips in valgrind without any UB happening
<andrewrk>
are you suuuuuuure assertions are enabled? :)
<TheLemonMan>
yeah, it's the usual debug build :(
<andrewrk>
very strange. we need scooby doo & the gang
<mikdusan>
fyi llc takes -mtriple, is that equiv to clang's -target ?
<mikdusan>
but yeah second time I've seen llc not quite in sync with reproducing things
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<g-w1>
andrewrk: there is another case of decl.is_pub being set wrong, std.builtin is private, and in gdb it says decl.is_pub is false, ill try to debug this :)
<TheLemonMan>
well, somebody is already on that, let's move on
<andrewrk>
g-w1, thanks. I'm working on usingnamespace
<TheLemonMan>
I have a patch for the mips problem with lld but it's definitely not release material
<andrewrk>
ah bummer
<TheLemonMan>
and it's not really a lld regression, our test bins became bigger in between releases and started triggering this problem
<andrewrk>
ahh I see
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<TheLemonMan>
ELF linkers are all fun and games until you start supporting MIPS heh
<g-w1>
whats so bad about mips?
<mikdusan>
bigger is probably what #6408 is about too. I think our std.zig passed a threshold
<TheLemonMan>
g-w1, it's full of quirks and slightly different ways of doing the same thing
<g-w1>
interesting
<mikdusan>
mips, mipsel, mips64, mips64el, oh my. and speaking of archs, el=endian_little except when ppc64le then it's le=little_endian
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<TheLemonMan>
there's also the -eb/-be pair of suffixes
<mikdusan>
yeah thanks for piling on :P
<mikdusan>
amd wtf was intel thinking making `ia64` mean itanium. they did it just so we couldn't have a nice ia32 vs ia64
<mikdusan>
s/amd/and/
<TheLemonMan>
that's because AMD introduced x86_64 while Intel was developing Itanium
<TheLemonMan>
rip Itanium (and PA-RISC)
<mikdusan>
gawd I remember $20K hppa workstation days. and c-front based c++ compiler. just no!
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<g-w1>
now --watch is actually becoming useful! I think we might need some aliases, for example u for update and <CR> to do the previous command as it is annoying to re-type
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<andrewrk>
sounds good :)
<andrewrk>
the ultimate flex is going to be IDE integration with --watch
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<g-w1>
it seems to me that --watch regressed with the recent stuff too
<jeregrine>
is there a issue or thread I should be following on mac arm support in zig?
<jeregrine>
I know i can build from source but a tool I want to use (zigler in elixir) uses release build zips.
<andrewrk>
jeregrine, it's pretty well supported, so just look for issues labeled "os-macos" or "arch-aarch64"
<jeregrine>
k I will probably need to update the tool to let me build from source or let me use the "system" version of it.
<andrewrk>
ah right mikdusan did you have a plan for getting the aarch64-macos builds to the download page?
<mikdusan>
andrewrk: there was a weird thing about our scripts for sending json and uploading 2 copies, 1 with seemingly bogus name so I need to pick your brain. but yeah, the tarball is being produced already so shouldn't be too much to put it on ziglang.org
<mikdusan>
i have to run out for an appointment will ping you when i get back
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<andrewrk>
g-w1, it might be nice to submit such an issue in the form of a new test case
<andrewrk>
our stage2 test cases express updates
<andrewrk>
this terminal dump is kind of hard to read
<g-w1>
ah yeah sorry, ill add a test case ;)
<g-w1>
can cases @import("std") yet?
<g-w1>
i can try to add that to the test harness if not
<g-w1>
in the meantime i updated the terminal dump to be a little more readable
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<g-w1>
ahh adding a failing test case wasn't hard, added that to the issue
<g-w1>
i think this exact error will go away with usingnamespace, but the idea will stay
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<g-w1>
does deleteDecl need to delete the decls it references too? im not that antiquated with this part of the compiler
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<andrewrk>
g-w1, not yet, I'm trying to add the very first passing test case that does @import("std")
<andrewrk>
no, deleteDecl deletes only 1 decl, however it will populate deletion_set as appropriate for any dependencies
<andrewrk>
grep for deletion_set and read all the surrounding comments for more context :)
<g-w1>
ok, thanks
<andrewrk>
note that there are only 2 callsites to deleteDecl
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<andrewrk>
I bit off a lot to chew today, let's see if I can handle it
<g-w1>
what did you do besides the usingnamespace?
<andrewrk>
proper outdated file detection on update (of all files in the entire compilation), fixing the mixups between Scope.File and Scope.Container, making the main entry point be std.zig not the root source file (this is correct and is what stage1 does), implement usingnamespace
<andrewrk>
these things are all related
<andrewrk>
uh and adding support for other files to compile error test cases in the test harness (e.g. "foo.zig:1:5: note: declared here")
<g-w1>
ah yea, they are all related in subtle ways. i assume the first one will fix the bug I found.
<Raito_Bezarius>
given a value v: u32, if I want to get a [4]u8, can I just do @bitCast ?
<fengb>
If you want native endian bytes, yeah that's fine
<Raito_Bezarius>
also, I'm wondering where does Zig writes the metadata for the PE files ; I think some fields are wrong with respect to UEFI specs (e.g. architecture, etc.)
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<andrewrk>
that would be in LLD
<Raito_Bezarius>
so it's a linking phase?
<Raito_Bezarius>
it's at*
<andrewrk>
yeah that's where the PE metadata is written
<Raito_Bezarius>
alright, thank you!
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<Raito_Bezarius>
if I do something like this:
<Raito_Bezarius>
var glyph: [*]const u8 = (@bitCast([8]u8, @as(u64, 0xb9a5b9817e000000)))[0..];
<Raito_Bezarius>
if I read beyond the actual size glyph, I can get UB right?
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<andrewrk>
right. that particular construct is going to become a compile error according to the latest spec (no taking address of temporary like that)
<andrewrk>
but same idea if you stuffed it into a const and then used &
<fengb>
I can't tell if this is a bug. I'm trying to add support for powerpc and inside `posixCallMainAndExit`, there's a store ($SP+4) but no decrements
<fengb>
So it's clobbering argv[0]
<fengb>
Do I need to manually decrement the stackpointer?