[llvm-dev] Cast between struct

[Krzysztof Parzyszek via llvm-dev]

You can
1. extract individual elements of {i8*, i64},
2. bitcast the first to some_struct*,
3. insert them into a new struct of type {some_struct*, i64}.


--
Krzysztof Parzyszek  kparzysz at quicinc.com   AI tools development

> -----Original Message-----
> From: llvm-dev <llvm-dev-bounces at lists.llvm.org> On Behalf Of Jie Zhou via
> llvm-dev
> Sent: Wednesday, May 6, 2020 7:17 PM
> To: Joerg Sonnenberger via llvm-dev <llvm-dev at lists.llvm.org>
> Subject: [EXT] [llvm-dev] Cast between struct
>
> Dear All,
>
> In my development, a function returns a struct {i8*, i64}, and on the call
> site I need to assign the return value to a struct of type {some_struct*,
> i64}.
> One way to do it is to call the mutateType() method of llvm::Value on the
> return value of the function call; however, I’m concerned that this
> mutateType() method might be too disruptive (it’s discouraged to use it by
> the documentation).
> Since LLVM does not support cast between structs. Is there any way I can
> safely “cast” a value of one struct type to another?
>
> Thanks,
> - Jie
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