[PATCH] c++: Small incremental tweak to source_location::current() folding

Jason Merrill jason@redhat.com
Mon Nov 29 22:45:11 GMT 2021


On 11/27/21 03:52, Jakub Jelinek wrote:
> On Wed, Nov 24, 2021 at 11:42:28PM +0100, Jakub Jelinek via Gcc-patches wrote:
>>> I'm surprised the source_location::current handling would be needed; why do
>>> calls to that function live long enough for us to walk into the ADDR_EXPR
>>> here?  Maybe we should fold it in cp_fold instead of cp_genericize_r.
> 
> I've already committed the patch, but perhaps we shouldn't do it in cp_fold
> where it will be folded even for warnings etc. and the locations might not
> be the final yet.  This patch moves it to cp_fold_r so that it is done just
> once for each function and just once for each static initializer.
> 
> Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?

OK.

> 2021-11-27  Jakub Jelinek  <jakub@redhat.com>
> 
> 	* cp-gimplify.c (cp_fold_r): Perform folding of
> 	std::source_location::current() calls here...
> 	(cp_fold): ... rather than here.
> 
> --- gcc/cp/cp-gimplify.c.jj	2021-11-26 10:10:53.227121384 +0100
> +++ gcc/cp/cp-gimplify.c	2021-11-26 11:51:50.945204127 +0100
> @@ -930,6 +930,13 @@ cp_fold_r (tree *stmt_p, int *walk_subtr
>   	}
>         break;
>   
> +    case CALL_EXPR:
> +      if (tree fndecl = cp_get_callee_fndecl_nofold (stmt))
> +	if (DECL_IMMEDIATE_FUNCTION_P (fndecl)
> +	    && source_location_current_p (fndecl))
> +	  *stmt_p = stmt = cxx_constant_value (stmt);
> +      break;
> +
>       default:
>         break;
>       }
> @@ -2672,14 +2679,6 @@ cp_fold (tree x)
>   	int sv = optimize, nw = sv;
>   	tree callee = get_callee_fndecl (x);
>   
> -	if (tree fndecl = cp_get_callee_fndecl_nofold (x))
> -	  if (DECL_IMMEDIATE_FUNCTION_P (fndecl)
> -	      && source_location_current_p (fndecl))
> -	    {
> -	      x = cxx_constant_value (x);
> -	      break;
> -	    }
> -
>   	/* Some built-in function calls will be evaluated at compile-time in
>   	   fold ().  Set optimize to 1 when folding __builtin_constant_p inside
>   	   a constexpr function so that fold_builtin_1 doesn't fold it to 0.  */
> 
> 
> 	Jakub
> 



More information about the Gcc-patches mailing list