[gcc r15-371] c++: Implement __remove_all_extents built-in trait

[Ken Matsui via Gcc-cvs]

https://gcc.gnu.org/g:86812be98a129ac9923df5dfb6b457bfe28e9e8c

commit r15-371-g86812be98a129ac9923df5dfb6b457bfe28e9e8c
Author: Ken Matsui <kmat...@gcc.gnu.org>
Date:   Wed Feb 14 22:45:31 2024 -0800

    c++: Implement __remove_all_extents built-in trait
    
    This patch implements built-in trait for std::remove_all_extents.
    
    gcc/cp/ChangeLog:
    
            * cp-trait.def: Define __remove_all_extents.
            * semantics.cc (finish_trait_type): Handle
            CPTK_REMOVE_ALL_EXTENTS.
    
    gcc/testsuite/ChangeLog:
    
            * g++.dg/ext/has-builtin-1.C: Test existence of
            __remove_all_extents.
            * g++.dg/ext/remove_all_extents.C: New test.
    
    Signed-off-by: Ken Matsui <kmat...@gcc.gnu.org>
    Reviewed-by: Jason Merrill <ja...@redhat.com>

Diff:
---
 gcc/cp/cp-trait.def                           |  1 +
 gcc/cp/semantics.cc                           |  3 +++
 gcc/testsuite/g++.dg/ext/has-builtin-1.C      |  3 +++
 gcc/testsuite/g++.dg/ext/remove_all_extents.C | 16 ++++++++++++++++
 4 files changed, 23 insertions(+)

diff --git a/gcc/cp/cp-trait.def b/gcc/cp/cp-trait.def
index 577c96d579bf..933c8bcbe68e 100644
--- a/gcc/cp/cp-trait.def
+++ b/gcc/cp/cp-trait.def
@@ -98,6 +98,7 @@ 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)
 DEFTRAIT_EXPR (REF_CONVERTS_FROM_TEMPORARY, 
"__reference_converts_from_temporary", 2)
+DEFTRAIT_TYPE (REMOVE_ALL_EXTENTS, "__remove_all_extents", 1)
 DEFTRAIT_TYPE (REMOVE_CV, "__remove_cv", 1)
 DEFTRAIT_TYPE (REMOVE_CVREF, "__remove_cvref", 1)
 DEFTRAIT_TYPE (REMOVE_EXTENT, "__remove_extent", 1)
diff --git a/gcc/cp/semantics.cc b/gcc/cp/semantics.cc
index b2122cedff5e..c2ab08c56052 100644
--- a/gcc/cp/semantics.cc
+++ b/gcc/cp/semantics.cc
@@ -12934,6 +12934,9 @@ finish_trait_type (cp_trait_kind kind, tree type1, tree 
type2,
        }
       return type1;
 
+    case CPTK_REMOVE_ALL_EXTENTS:
+      return strip_array_types (type1);
+
     case CPTK_REMOVE_CV:
       return cv_unqualified (type1);
 
diff --git a/gcc/testsuite/g++.dg/ext/has-builtin-1.C 
b/gcc/testsuite/g++.dg/ext/has-builtin-1.C
index d58e41867049..f0b165e28916 100644
--- a/gcc/testsuite/g++.dg/ext/has-builtin-1.C
+++ b/gcc/testsuite/g++.dg/ext/has-builtin-1.C
@@ -176,6 +176,9 @@
 #if !__has_builtin (__reference_converts_from_temporary)
 # error "__has_builtin (__reference_converts_from_temporary) failed"
 #endif
+#if !__has_builtin (__remove_all_extents)
+# error "__has_builtin (__remove_all_extents) failed"
+#endif
 #if !__has_builtin (__remove_cv)
 # error "__has_builtin (__remove_cv) failed"
 #endif
diff --git a/gcc/testsuite/g++.dg/ext/remove_all_extents.C 
b/gcc/testsuite/g++.dg/ext/remove_all_extents.C
new file mode 100644
index 000000000000..60ade2ade7fc
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/remove_all_extents.C
@@ -0,0 +1,16 @@
+// { dg-do compile { target c++11 } }
+
+#define SA(X) static_assert((X),#X)
+
+class ClassType { };
+
+SA(__is_same(__remove_all_extents(int), int));
+SA(__is_same(__remove_all_extents(int[2]), int));
+SA(__is_same(__remove_all_extents(int[2][3]), int));
+SA(__is_same(__remove_all_extents(int[][3]), int));
+SA(__is_same(__remove_all_extents(const int[2][3]), const int));
+SA(__is_same(__remove_all_extents(ClassType), ClassType));
+SA(__is_same(__remove_all_extents(ClassType[2]), ClassType));
+SA(__is_same(__remove_all_extents(ClassType[2][3]), ClassType));
+SA(__is_same(__remove_all_extents(ClassType[][3]), ClassType));
+SA(__is_same(__remove_all_extents(const ClassType[2][3]), const ClassType));