[llvm-dev] [lldb-dev] LLVM-C

Isaac Hier via llvm-dev llvm-dev at lists.llvm.org
Wed Jun 6 04:43:13 PDT 2018

Why are you passing a zero sized array? Pass a pointer and perhaps a length
argument instead. My understanding is that VLAs are not the equivalent of a
Java array or a Go slice. There is no way to determine the length at
runtime. The type of the array is determined by its size. IIRC, C99 VLAs
use alloca and pointers to implement the same functionality.

On Tue, Jun 5, 2018, 5:13 AM Pavel Labath via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> This doesn't look like an lldb question. Did you mean to send it to
> llvm-dev instead?
> On Tue, 5 Jun 2018 at 03:13, Giannis Zamanis via lldb-dev
> <lldb-dev at lists.llvm.org> wrote:
> >
> > Hello,
> >
> > I am writing a compiler using llvm-c api and  i want to have
> variable-length arrays as arguments in functions.I have tried using
> zero-sized type array as the typical parameter in the function definition,
> but when i call the function with a normal-sized array as argument it
> throws error due to mismatch in types. I can't find a workaround for this.
> > Example:
> > define i32 @ha([0 x i32]*)
> > %funccall = call i32 @ha([20 x i32]* %only_l)
> >
> > Thank you for your time,
> > John
> > _______________________________________________
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> > lldb-dev at lists.llvm.org
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