https://gcc.gnu.org/g:06d64eb96cd9faf7e725bd4fbe5b859d23c5ecb5
commit r15-368-g06d64eb96cd9faf7e725bd4fbe5b859d23c5ecb5
Author: Ken Matsui <kmat...@gcc.gnu.org>
Date: Mon Sep 11 13:54:39 2023 -0700
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 <kmat...@gcc.gnu.org>
Reviewed-by: Jason Merrill <ja...@redhat.com>
Diff:
---
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(+)
diff --git a/gcc/cp/constraint.cc b/gcc/cp/constraint.cc
index 5a8aaa70fa60..d4cc88504863 100644
--- a/gcc/cp/constraint.cc
+++ b/gcc/cp/constraint.cc
@@ -3862,6 +3862,9 @@ 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 18e2d0f3480c..05514a51c21f 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 71520dcd4fa9..e49d3e35e8b5 100644
--- a/gcc/cp/semantics.cc
+++ b/gcc/cp/semantics.cc
@@ -12620,6 +12620,9 @@ 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;
@@ -12836,6 +12839,7 @@ 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 4cbe6fe8cea4..1e10c87754a3 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 000000000000..283a74e1a0a7
--- /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);
