[v14,07/26] c++: Implement __is_unbounded_array built-in trait

  This patch implements built-in trait for std::is_unbounded_array.

gcc/cp/ChangeLog:

	* cp-trait.def: Define __is_unbounded_array.
	* constraint.cc (diagnose_trait_expr): Handle
	CPTK_IS_UNBOUNDED_ARRAY.
	* semantics.cc (trait_expr_value): Likewise.
	(finish_trait_expr): Likewise.

gcc/testsuite/ChangeLog:

	* g++.dg/ext/has-builtin-1.C: Test existence of
	__is_unbounded_array.
	* g++.dg/ext/is_unbounded_array.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_unbounded_array.C | 37 +++++++++++++++++++
 5 files changed, 48 insertions(+)
 create mode 100644 gcc/testsuite/g++.dg/ext/is_unbounded_array.C
  

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

OK.

> gcc/cp/ChangeLog:
> 
> 	* cp-trait.def: Define __is_unbounded_array.
> 	* constraint.cc (diagnose_trait_expr): Handle
> 	CPTK_IS_UNBOUNDED_ARRAY.
> 	* semantics.cc (trait_expr_value): Likewise.
> 	(finish_trait_expr): Likewise.
> 
> gcc/testsuite/ChangeLog:
> 
> 	* g++.dg/ext/has-builtin-1.C: Test existence of
> 	__is_unbounded_array.
> 	* g++.dg/ext/is_unbounded_array.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_unbounded_array.C | 37 +++++++++++++++++++
>   5 files changed, 48 insertions(+)
>   create mode 100644 gcc/testsuite/g++.dg/ext/is_unbounded_array.C
> 
> diff --git a/gcc/cp/constraint.cc b/gcc/cp/constraint.cc
> index 244070d93c2..000df847342 100644
> --- a/gcc/cp/constraint.cc
> +++ b/gcc/cp/constraint.cc
> @@ -3861,6 +3861,9 @@ diagnose_trait_expr (tree expr, tree args)
>       case CPTK_IS_TRIVIALLY_COPYABLE:
>         inform (loc, "  %qT is not trivially copyable", t1);
>         break;
> +    case CPTK_IS_UNBOUNDED_ARRAY:
> +      inform (loc, "  %qT is not an unbounded array", t1);
> +      break;
>       case CPTK_IS_UNION:
>         inform (loc, "  %qT is not a union", t1);
>         break;
> diff --git a/gcc/cp/cp-trait.def b/gcc/cp/cp-trait.def
> index 18e2d0f3480..05514a51c21 100644
> --- a/gcc/cp/cp-trait.def
> +++ b/gcc/cp/cp-trait.def
> @@ -92,6 +92,7 @@ DEFTRAIT_EXPR (IS_TRIVIAL, "__is_trivial", 1)
>   DEFTRAIT_EXPR (IS_TRIVIALLY_ASSIGNABLE, "__is_trivially_assignable", 2)
>   DEFTRAIT_EXPR (IS_TRIVIALLY_CONSTRUCTIBLE, "__is_trivially_constructible", -1)
>   DEFTRAIT_EXPR (IS_TRIVIALLY_COPYABLE, "__is_trivially_copyable", 1)
> +DEFTRAIT_EXPR (IS_UNBOUNDED_ARRAY, "__is_unbounded_array", 1)
>   DEFTRAIT_EXPR (IS_UNION, "__is_union", 1)
>   DEFTRAIT_EXPR (IS_VOLATILE, "__is_volatile", 1)
>   DEFTRAIT_EXPR (REF_CONSTRUCTS_FROM_TEMPORARY, "__reference_constructs_from_temporary", 2)
> diff --git a/gcc/cp/semantics.cc b/gcc/cp/semantics.cc
> index 9dcdb06191a..1794e83baa2 100644
> --- a/gcc/cp/semantics.cc
> +++ b/gcc/cp/semantics.cc
> @@ -12532,6 +12532,9 @@ trait_expr_value (cp_trait_kind kind, tree type1, tree type2)
>       case CPTK_IS_TRIVIALLY_COPYABLE:
>         return trivially_copyable_p (type1);
>   
> +    case CPTK_IS_UNBOUNDED_ARRAY:
> +      return array_of_unknown_bound_p (type1);
> +
>       case CPTK_IS_UNION:
>         return type_code1 == UNION_TYPE;
>   
> @@ -12708,6 +12711,7 @@ finish_trait_expr (location_t loc, cp_trait_kind kind, tree type1, tree type2)
>       case CPTK_IS_REFERENCE:
>       case CPTK_IS_SAME:
>       case CPTK_IS_SCOPED_ENUM:
> +    case CPTK_IS_UNBOUNDED_ARRAY:
>       case CPTK_IS_UNION:
>       case CPTK_IS_VOLATILE:
>         break;
> diff --git a/gcc/testsuite/g++.dg/ext/has-builtin-1.C b/gcc/testsuite/g++.dg/ext/has-builtin-1.C
> index 96b7a89e4f1..b1430e9bd8b 100644
> --- a/gcc/testsuite/g++.dg/ext/has-builtin-1.C
> +++ b/gcc/testsuite/g++.dg/ext/has-builtin-1.C
> @@ -158,6 +158,9 @@
>   #if !__has_builtin (__is_trivially_copyable)
>   # error "__has_builtin (__is_trivially_copyable) failed"
>   #endif
> +#if !__has_builtin (__is_unbounded_array)
> +# error "__has_builtin (__is_unbounded_array) failed"
> +#endif
>   #if !__has_builtin (__is_union)
>   # error "__has_builtin (__is_union) failed"
>   #endif
> diff --git a/gcc/testsuite/g++.dg/ext/is_unbounded_array.C b/gcc/testsuite/g++.dg/ext/is_unbounded_array.C
> new file mode 100644
> index 00000000000..283a74e1a0a
> --- /dev/null
> +++ b/gcc/testsuite/g++.dg/ext/is_unbounded_array.C
> @@ -0,0 +1,37 @@
> +// { dg-do compile { target c++11 } }
> +
> +#define SA(X) static_assert((X),#X)
> +
> +#define SA_TEST_CATEGORY(TRAIT, TYPE, EXPECT)	\
> +  SA(TRAIT(TYPE) == EXPECT);					\
> +  SA(TRAIT(const TYPE) == EXPECT);				\
> +  SA(TRAIT(volatile TYPE) == EXPECT);			\
> +  SA(TRAIT(const volatile TYPE) == EXPECT)
> +
> +class ClassType { };
> +class IncompleteClass;
> +union IncompleteUnion;
> +
> +SA_TEST_CATEGORY(__is_unbounded_array, int[2], false);
> +SA_TEST_CATEGORY(__is_unbounded_array, int[], true);
> +SA_TEST_CATEGORY(__is_unbounded_array, int[2][3], false);
> +SA_TEST_CATEGORY(__is_unbounded_array, int[][3], true);
> +SA_TEST_CATEGORY(__is_unbounded_array, float*[2], false);
> +SA_TEST_CATEGORY(__is_unbounded_array, float*[], true);
> +SA_TEST_CATEGORY(__is_unbounded_array, float*[2][3], false);
> +SA_TEST_CATEGORY(__is_unbounded_array, float*[][3], true);
> +SA_TEST_CATEGORY(__is_unbounded_array, ClassType[2], false);
> +SA_TEST_CATEGORY(__is_unbounded_array, ClassType[], true);
> +SA_TEST_CATEGORY(__is_unbounded_array, ClassType[2][3], false);
> +SA_TEST_CATEGORY(__is_unbounded_array, ClassType[][3], true);
> +SA_TEST_CATEGORY(__is_unbounded_array, IncompleteClass[2][3], false);
> +SA_TEST_CATEGORY(__is_unbounded_array, IncompleteClass[][3], true);
> +SA_TEST_CATEGORY(__is_unbounded_array, int(*)[2], false);
> +SA_TEST_CATEGORY(__is_unbounded_array, int(*)[], false);
> +SA_TEST_CATEGORY(__is_unbounded_array, int(&)[2], false);
> +SA_TEST_CATEGORY(__is_unbounded_array, int(&)[], false);
> +
> +// Sanity check.
> +SA_TEST_CATEGORY(__is_unbounded_array, ClassType, false);
> +SA_TEST_CATEGORY(__is_unbounded_array, IncompleteClass, false);
> +SA_TEST_CATEGORY(__is_unbounded_array, IncompleteUnion, false);