Re: [PATCH] Fix some GC issues in the aarch64 back-end.

[Richard Sandiford <richard.sandiford@arm.com>]

apinski--- via Gcc-patches <gcc-patches@gcc.gnu.org> writes:
> From: Andrew Pinski <apinski@marvell.com>
>
> I got some ICEs in my latest testsing while running the libstdc++ testsuite.
> I had noticed the problem was connected to types and had just touched the
> builtins code but nothing which could have caused this and I looked for
> some types/variables that were not being marked with GTY.
>
> OK? Bootstrapped and tested on aarch64-linux-gnu with no regressions.

OK.  I'm a bit surprised this makes a difference, since I'd have
expected the builtin function definitions to keep the types live.

I agree the change is clearly correct though.  We shouldn't be relying
on indirect marking.

Thanks,
Richard

>
> gcc/ChangeLog:
>
> 	* config/aarch64/aarch64-builtins.c (struct aarch64_simd_type_info):
> 	Mark with GTY.
> 	(aarch64_simd_types): Likewise.
> 	(aarch64_simd_intOI_type_node): Likewise.
> 	(aarch64_simd_intCI_type_node): Likewise.
> 	(aarch64_simd_intXI_type_node): Likewise.
> 	* config/aarch64/aarch64.h (aarch64_fp16_type_node): Likewise.
> 	(aarch64_fp16_ptr_type_node): Likewise.
> 	(aarch64_bf16_type_node): Likewise.
> 	(aarch64_bf16_ptr_type_node): Likewise.
> ---
>  gcc/config/aarch64/aarch64-builtins.c | 10 +++++-----
>  gcc/config/aarch64/aarch64.h          |  8 ++++----
>  2 files changed, 9 insertions(+), 9 deletions(-)
>
> diff --git a/gcc/config/aarch64/aarch64-builtins.c b/gcc/config/aarch64/aarch64-builtins.c
> index d441437..9f37a71 100644
> --- a/gcc/config/aarch64/aarch64-builtins.c
> +++ b/gcc/config/aarch64/aarch64-builtins.c
> @@ -594,7 +594,7 @@ enum aarch64_simd_type
>  };
>  #undef ENTRY
>  
> -struct aarch64_simd_type_info
> +struct GTY(()) aarch64_simd_type_info
>  {
>    enum aarch64_simd_type type;
>  
> @@ -626,14 +626,14 @@ struct aarch64_simd_type_info
>  
>  #define ENTRY(E, M, Q, G)  \
>    {E, "__" #E, #G "__" #E, NULL_TREE, NULL_TREE, E_##M##mode, qualifier_##Q},
> -static struct aarch64_simd_type_info aarch64_simd_types [] = {
> +static GTY(()) struct aarch64_simd_type_info aarch64_simd_types [] = {
>  #include "aarch64-simd-builtin-types.def"
>  };
>  #undef ENTRY
>  
> -static tree aarch64_simd_intOI_type_node = NULL_TREE;
> -static tree aarch64_simd_intCI_type_node = NULL_TREE;
> -static tree aarch64_simd_intXI_type_node = NULL_TREE;
> +static GTY(()) tree aarch64_simd_intOI_type_node = NULL_TREE;
> +static GTY(()) tree aarch64_simd_intCI_type_node = NULL_TREE;
> +static GTY(()) tree aarch64_simd_intXI_type_node = NULL_TREE;
>  
>  /* The user-visible __fp16 type, and a pointer to that type.  Used
>     across the back-end.  */
> diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h
> index bfffbcd..a5ba6c2 100644
> --- a/gcc/config/aarch64/aarch64.h
> +++ b/gcc/config/aarch64/aarch64.h
> @@ -1262,13 +1262,13 @@ extern const char *host_detect_local_cpu (int argc, const char **argv);
>  
>  /* This type is the user-visible __fp16, and a pointer to that type.  We
>     need it in many places in the backend.  Defined in aarch64-builtins.c.  */
> -extern tree aarch64_fp16_type_node;
> -extern tree aarch64_fp16_ptr_type_node;
> +extern GTY(()) tree aarch64_fp16_type_node;
> +extern GTY(()) tree aarch64_fp16_ptr_type_node;
>  
>  /* This type is the user-visible __bf16, and a pointer to that type.  Defined
>     in aarch64-builtins.c.  */
> -extern tree aarch64_bf16_type_node;
> -extern tree aarch64_bf16_ptr_type_node;
> +extern GTY(()) tree aarch64_bf16_type_node;
> +extern GTY(()) tree aarch64_bf16_ptr_type_node;
>  
>  /* The generic unwind code in libgcc does not initialize the frame pointer.
>     So in order to unwind a function using a frame pointer, the very first