Re: [PATCH] Use error_mark_node after error in convert

[Richard Biener <richard.guenther@gmail.com>]

On Mon, Oct 23, 2023 at 12:22 AM Andrew Pinski <pinskia@gmail.com> wrote:
>
> While working on PR c/111903, I Noticed that
> convert will convert integer_zero_node to that
> type after an error instead of returning error_mark_node.
> From what I can tell this was the old way of not having
> error recovery since other places in this file does return
> error_mark_node and the places I am replacing date from
> when the file was imported into the repro (either via a gcc2 merge
> or earlier).
>
> I also had to update the objc front-end to allow for the error_mark_node
> change, I suspect you could hit the ICE without this change though.
>
> Bootstrapped and tested on x86_64-linux-gnu with no regressions.

OK.

> gcc/ChangeLog:
>
>         * convert.cc (convert_to_pointer_1): Return error_mark_node
>         after an error.
>         (convert_to_real_1): Likewise.
>         (convert_to_integer_1): Likewise.
>         (convert_to_complex_1): Likewise.
>
> gcc/objc/ChangeLog:
>
>         * objc-gnu-runtime-abi-01.cc (build_objc_method_call): Allow
>         for error_operand after call to build_c_cast.
>         * objc-next-runtime-abi-01.cc (build_objc_method_call): Likewise.
>         * objc-next-runtime-abi-02.cc (build_v2_build_objc_method_call): Likewise.
> ---
>  gcc/convert.cc                       | 12 ++++++------
>  gcc/objc/objc-gnu-runtime-abi-01.cc  |  3 +++
>  gcc/objc/objc-next-runtime-abi-01.cc |  3 +++
>  gcc/objc/objc-next-runtime-abi-02.cc |  3 +++
>  4 files changed, 15 insertions(+), 6 deletions(-)
>
> diff --git a/gcc/convert.cc b/gcc/convert.cc
> index 5357609d8f0..ac6af7026a7 100644
> --- a/gcc/convert.cc
> +++ b/gcc/convert.cc
> @@ -96,7 +96,7 @@ convert_to_pointer_1 (tree type, tree expr, bool fold_p)
>
>      default:
>        error ("cannot convert to a pointer type");
> -      return convert_to_pointer_1 (type, integer_zero_node, fold_p);
> +      return error_mark_node;
>      }
>  }
>
> @@ -332,11 +332,11 @@ convert_to_real_1 (tree type, tree expr, bool fold_p)
>      case POINTER_TYPE:
>      case REFERENCE_TYPE:
>        error ("pointer value used where a floating-point was expected");
> -      return convert_to_real_1 (type, integer_zero_node, fold_p);
> +      return error_mark_node;
>
>      default:
>        error ("aggregate value used where a floating-point was expected");
> -      return convert_to_real_1 (type, integer_zero_node, fold_p);
> +      return error_mark_node;
>      }
>  }
>
> @@ -959,7 +959,7 @@ convert_to_integer_1 (tree type, tree expr, bool dofold)
>
>      default:
>        error ("aggregate value used where an integer was expected");
> -      return convert (type, integer_zero_node);
> +      return error_mark_node;
>      }
>  }
>
> @@ -1053,11 +1053,11 @@ convert_to_complex_1 (tree type, tree expr, bool fold_p)
>      case POINTER_TYPE:
>      case REFERENCE_TYPE:
>        error ("pointer value used where a complex was expected");
> -      return convert_to_complex_1 (type, integer_zero_node, fold_p);
> +      return error_mark_node;
>
>      default:
>        error ("aggregate value used where a complex was expected");
> -      return convert_to_complex_1 (type, integer_zero_node, fold_p);
> +      return error_mark_node;
>      }
>  }
>
> diff --git a/gcc/objc/objc-gnu-runtime-abi-01.cc b/gcc/objc/objc-gnu-runtime-abi-01.cc
> index fbf8307297a..6f45283b307 100644
> --- a/gcc/objc/objc-gnu-runtime-abi-01.cc
> +++ b/gcc/objc/objc-gnu-runtime-abi-01.cc
> @@ -700,6 +700,9 @@ build_objc_method_call (location_t loc, int super_flag, tree method_prototype,
>
>    lookup_object = build_c_cast (loc, rcv_p, lookup_object);
>
> +  if (error_operand_p (lookup_object))
> +    return error_mark_node;
> +
>    /* Use SAVE_EXPR to avoid evaluating the receiver twice.  */
>    lookup_object = save_expr (lookup_object);
>
> diff --git a/gcc/objc/objc-next-runtime-abi-01.cc b/gcc/objc/objc-next-runtime-abi-01.cc
> index 70ab5262e17..9e28976043e 100644
> --- a/gcc/objc/objc-next-runtime-abi-01.cc
> +++ b/gcc/objc/objc-next-runtime-abi-01.cc
> @@ -846,6 +846,9 @@ build_objc_method_call (location_t loc, int super_flag, tree method_prototype,
>
>    lookup_object = build_c_cast (loc, rcv_p, lookup_object);
>
> +  if (error_operand_p (lookup_object))
> +    return error_mark_node;
> +
>    /* Use SAVE_EXPR to avoid evaluating the receiver twice.  */
>    lookup_object = save_expr (lookup_object);
>
> diff --git a/gcc/objc/objc-next-runtime-abi-02.cc b/gcc/objc/objc-next-runtime-abi-02.cc
> index 6548c0078e0..723b47c9cf6 100644
> --- a/gcc/objc/objc-next-runtime-abi-02.cc
> +++ b/gcc/objc/objc-next-runtime-abi-02.cc
> @@ -1729,6 +1729,9 @@ build_v2_build_objc_method_call (int super, tree method_prototype,
>
>    lookup_object = build_c_cast (loc, rcv_p, lookup_object);
>
> +  if (error_operand_p (lookup_object))
> +    return error_mark_node;
> +
>    /* Use SAVE_EXPR to avoid evaluating the receiver twice.  */
>    lookup_object = save_expr (lookup_object);
>
> --
> 2.39.3
>