[LLVMdev] Accessing arguments in a caller

[Carlo Alberto Ferraris]

Nella citazione lunedì 22 agosto 2011 11:53:29, Duncan Sands ha scritto:
> Hi Carlo, rather than declaring individual stack variables
>     int x;
>     int y;
>     int z;
> and so on, which requires you to pass each one, or a pointer to each one,
> to your function, declare one stack variable of struct type that holds
> them all:
>     struct StackObjects {
>       int x;
>       int y;
>       int z;
>       ...
>     };
> ...
>     struct StackObjects stack;
> then pass the address of stack to your function, enabling it to access all
> of the objects on the callers stack.  This way you only need to copy a single
> pointer.  This is what GCC's nested function implementation does for example to
> enable child functions to access variables on the parent's stack.

Hi Duncan,
this is what I'm already doing (see 
http://stackoverflow.com/questions/7144733/argument-forwarding-in-llvm, 
the code I posted is in pseudo-C but I'm actually working on LLVM-IR in 
my pass) but this in
curs the boxing-unboxing penalty and I was 
wondering if there is a way to avoid it.
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