Re: [PATCH] jit: Add support for global rvalue initialization and ctors

["Marc Nieper-Wißkirchen" <marc.nieper+gnu@gmail.com>]

 Hi,

I would favor adding support for this kind of initialization to libgccjit.

Does it also support the libgccjit equivalent of the following C module,
which contains forward references in the struct initializers?

struct bar bar;
struct foo foo;

struct foo
{
  struct bar *b;
};

struct bar
{
  struct foo *f;
};

struct bar bar = {.f = &foo};
struct foo foo = {.b = &bar};

Thanks,

Marc

Am Mo., 29. Nov. 2021 um 21:04 Uhr schrieb Petter Tomner via Jit <
jit@gcc.gnu.org>:

> Hi!
>
> I have wrapped up the patch than adds support for initialization of global
> variables
> with rvalues aswell as rvalue constructors for structs, arrays and unions.
>
> New entrypoints are:
>
> gcc_jit_global_set_initializer_rvalue
>
> Which sets the initial value of a global to a rvalue.
>
> And:
>
> gcc_jit_context_new_array_constructor
> gcc_jit_context_new_struct_constructor
> gcc_jit_context_new_union_constructor
>
> Those three makes a constructor with a rvalue that e.g. can be assigned to
> a local or returned
> from a function, or most importantly used to set the initial value of
> global variables
> with gcc_jit_global_set_initializer_rvalue.
>
> If no fields are specified for a struct or union to the constructors,
> definition order is assumed.
>
> There can be gaps in the fields specified to the struct constructor, but
> they need to be in order.
>
> For pointer arithmetic to work with setting DECL_INITIAL, alot of folding
> is added.
>
> make check-jit runs fine on gnu-linux-x64 Debian.
>
> Regards,