[PATCH v14 05/26] c++: Implement __is_pointer built-in trait

[Jason Merrill]

On 2/28/24 11:26, Ken Matsui wrote:
> This patch implements built-in trait for std::is_pointer.

OK.

> gcc/cp/ChangeLog:
> 
> 	* cp-trait.def: Define __is_pointer.
> 	* constraint.cc (diagnose_trait_expr): Handle CPTK_IS_POINTER.
> 	* semantics.cc (trait_expr_value): Likewise.
> 	(finish_trait_expr): Likewise.
> 
> gcc/testsuite/ChangeLog:
> 
> 	* g++.dg/ext/has-builtin-1.C: Test existence of __is_pointer.
> 	* g++.dg/ext/is_pointer.C: New test.
> 
> Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
> ---
>   gcc/cp/constraint.cc                     |  3 ++
>   gcc/cp/cp-trait.def                      |  1 +
>   gcc/cp/semantics.cc                      |  4 ++
>   gcc/testsuite/g++.dg/ext/has-builtin-1.C |  3 ++
>   gcc/testsuite/g++.dg/ext/is_pointer.C    | 51 ++++++++++++++++++++++++
>   5 files changed, 62 insertions(+)
>   create mode 100644 gcc/testsuite/g++.dg/ext/is_pointer.C
> 
> diff --git a/gcc/cp/constraint.cc b/gcc/cp/constraint.cc
> index 9a7a12629e7..244070d93c2 100644
> --- a/gcc/cp/constraint.cc
> +++ b/gcc/cp/constraint.cc
> @@ -3828,6 +3828,9 @@ diagnose_trait_expr (tree expr, tree args)
>       case CPTK_IS_POD:
>         inform (loc, "  %qT is not a POD type", t1);
>         break;
> +    case CPTK_IS_POINTER:
> +      inform (loc, "  %qT is not a pointer", t1);
> +      break;
>       case CPTK_IS_POLYMORPHIC:
>         inform (loc, "  %qT is not a polymorphic type", t1);
>         break;
> diff --git a/gcc/cp/cp-trait.def b/gcc/cp/cp-trait.def
> index e9347453829..18e2d0f3480 100644
> --- a/gcc/cp/cp-trait.def
> +++ b/gcc/cp/cp-trait.def
> @@ -82,6 +82,7 @@ DEFTRAIT_EXPR (IS_NOTHROW_CONVERTIBLE, "__is_nothrow_convertible", 2)
>   DEFTRAIT_EXPR (IS_OBJECT, "__is_object", 1)
>   DEFTRAIT_EXPR (IS_POINTER_INTERCONVERTIBLE_BASE_OF, "__is_pointer_interconvertible_base_of", 2)
>   DEFTRAIT_EXPR (IS_POD, "__is_pod", 1)
> +DEFTRAIT_EXPR (IS_POINTER, "__is_pointer", 1)
>   DEFTRAIT_EXPR (IS_POLYMORPHIC, "__is_polymorphic", 1)
>   DEFTRAIT_EXPR (IS_REFERENCE, "__is_reference", 1)
>   DEFTRAIT_EXPR (IS_SAME, "__is_same", 2)
> diff --git a/gcc/cp/semantics.cc b/gcc/cp/semantics.cc
> index 41c25f43d27..9dcdb06191a 100644
> --- a/gcc/cp/semantics.cc
> +++ b/gcc/cp/semantics.cc
> @@ -12502,6 +12502,9 @@ trait_expr_value (cp_trait_kind kind, tree type1, tree type2)
>       case CPTK_IS_POD:
>         return pod_type_p (type1);
>   
> +    case CPTK_IS_POINTER:
> +      return TYPE_PTR_P (type1);
> +
>       case CPTK_IS_POLYMORPHIC:
>         return CLASS_TYPE_P (type1) && TYPE_POLYMORPHIC_P (type1);
>   
> @@ -12701,6 +12704,7 @@ finish_trait_expr (location_t loc, cp_trait_kind kind, tree type1, tree type2)
>       case CPTK_IS_MEMBER_OBJECT_POINTER:
>       case CPTK_IS_MEMBER_POINTER:
>       case CPTK_IS_OBJECT:
> +    case CPTK_IS_POINTER:
>       case CPTK_IS_REFERENCE:
>       case CPTK_IS_SAME:
>       case CPTK_IS_SCOPED_ENUM:
> diff --git a/gcc/testsuite/g++.dg/ext/has-builtin-1.C b/gcc/testsuite/g++.dg/ext/has-builtin-1.C
> index b2e2f2f694d..96b7a89e4f1 100644
> --- a/gcc/testsuite/g++.dg/ext/has-builtin-1.C
> +++ b/gcc/testsuite/g++.dg/ext/has-builtin-1.C
> @@ -125,6 +125,9 @@
>   #if !__has_builtin (__is_pod)
>   # error "__has_builtin (__is_pod) failed"
>   #endif
> +#if !__has_builtin (__is_pointer)
> +# error "__has_builtin (__is_pointer) failed"
> +#endif
>   #if !__has_builtin (__is_polymorphic)
>   # error "__has_builtin (__is_polymorphic) failed"
>   #endif
> diff --git a/gcc/testsuite/g++.dg/ext/is_pointer.C b/gcc/testsuite/g++.dg/ext/is_pointer.C
> new file mode 100644
> index 00000000000..d6e39565950
> --- /dev/null
> +++ b/gcc/testsuite/g++.dg/ext/is_pointer.C
> @@ -0,0 +1,51 @@
> +// { dg-do compile { target c++11 } }
> +
> +#define SA(X) static_assert((X),#X)
> +
> +SA(!__is_pointer(int));
> +SA(__is_pointer(int*));
> +SA(__is_pointer(int**));
> +
> +SA(__is_pointer(const int*));
> +SA(__is_pointer(const int**));
> +SA(__is_pointer(int* const));
> +SA(__is_pointer(int** const));
> +SA(__is_pointer(int* const* const));
> +
> +SA(__is_pointer(volatile int*));
> +SA(__is_pointer(volatile int**));
> +SA(__is_pointer(int* volatile));
> +SA(__is_pointer(int** volatile));
> +SA(__is_pointer(int* volatile* volatile));
> +
> +SA(__is_pointer(const volatile int*));
> +SA(__is_pointer(const volatile int**));
> +SA(__is_pointer(const int* volatile));
> +SA(__is_pointer(volatile int* const));
> +SA(__is_pointer(int* const volatile));
> +SA(__is_pointer(const int** volatile));
> +SA(__is_pointer(volatile int** const));
> +SA(__is_pointer(int** const volatile));
> +SA(__is_pointer(int* const* const volatile));
> +SA(__is_pointer(int* volatile* const volatile));
> +SA(__is_pointer(int* const volatile* const volatile));
> +
> +SA(!__is_pointer(int&));
> +SA(!__is_pointer(const int&));
> +SA(!__is_pointer(volatile int&));
> +SA(!__is_pointer(const volatile int&));
> +
> +SA(!__is_pointer(int&&));
> +SA(!__is_pointer(const int&&));
> +SA(!__is_pointer(volatile int&&));
> +SA(!__is_pointer(const volatile int&&));
> +
> +SA(!__is_pointer(int[3]));
> +SA(!__is_pointer(const int[3]));
> +SA(!__is_pointer(volatile int[3]));
> +SA(!__is_pointer(const volatile int[3]));
> +
> +SA(!__is_pointer(int(int)));
> +SA(__is_pointer(int(*const)(int)));
> +SA(__is_pointer(int(*volatile)(int)));
> +SA(__is_pointer(int(*const volatile)(int)));