[PATCH] libgccjit: Add support for types used by atomic builtins [PR96066] [PR96067]

[Antoni Boucher]

Hi.
Here's the updated patch.
Thanks for the review!

Le jeudi 20 mai 2021 à 16:24 -0400, David Malcolm a écrit :
> On Mon, 2021-05-17 at 21:02 -0400, Antoni Boucher via Jit wrote:
> > Hello.
> > This patch fixes the issue with using atomic builtins in libgccjit.
> > Thanks to review it.
> 
> [...snip...]
>  
> > diff --git a/gcc/jit/jit-recording.c b/gcc/jit/jit-recording.c
> > index 117ff70114c..de876ff9fa6 100644
> > --- a/gcc/jit/jit-recording.c
> > +++ b/gcc/jit/jit-recording.c
> > @@ -2598,8 +2598,18 @@
> > recording::memento_of_get_pointer::accepts_writes_from (type
> > *rtype)
> >      return false;
> >  
> >    /* It's OK to assign to a (const T *) from a (T *).  */
> > -  return m_other_type->unqualified ()
> > -    ->accepts_writes_from (rtype_points_to);
> > +  if (m_other_type->unqualified ()
> > +    ->accepts_writes_from (rtype_points_to)) {
> > +      return true;
> > +  }
> > +
> > +  /* It's OK to assign to a (volatile const T *) from a (volatile
> > const T *). */
> > +  if (m_other_type->unqualified ()->unqualified ()
> > +    ->accepts_writes_from (rtype_points_to->unqualified ())) {
> > +      return true;
> > +  }
> 
> Presumably you need this to get the atomic builtins working?
> 
> If I'm reading the above correctly, the new test doesn't distinguish
> between the 3 different kinds of qualifiers (aligned, volatile, and
> const), it merely tries to strip some of them off.
> 
> It's not valid to e.g. assign to a (aligned T *) from a (const T *).
> 
> Maybe we need an internal enum to discriminate between different
> subclasses of decorated_type?
> 
> 
> > +
> > +  return false;
> >  }
> >  
> >  /* Implementation of pure virtual hook
> > recording::memento::replay_into
> > diff --git a/gcc/testsuite/jit.dg/all-non-failing-tests.h
> > b/gcc/testsuite/jit.dg/all-non-failing-tests.h
> > index 4202eb7798b..dfc6596358c 100644
> > --- a/gcc/testsuite/jit.dg/all-non-failing-tests.h
> > +++ b/gcc/testsuite/jit.dg/all-non-failing-tests.h
> > @@ -181,6 +181,13 @@
> >  #undef create_code
> >  #undef verify_code
> >  
> > +/* test-builtin-types.c */
> > +#define create_code create_code_builtin_types
> > +#define verify_code verify_code_builtin_types
> > +#include "test-builtin-types.c"
> > +#undef create_code
> > +#undef verify_code
> > +
> >  /* test-hello-world.c */
> >  #define create_code create_code_hello_world
> >  #define verify_code verify_code_hello_world
> 
> As with various other patches, this needs to also add a new entry to
> the "testcases" array making use of the new
> {create|verify}_code_builtin_types functions.
> 
> [...snip...]
> 
> Hope this is constructive
> Dave
> 

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