[PATCH v11 29/40] c++, libstdc++: Implement __is_pointer built-in trait

[Ken Matsui <kmatsui@gcc.gnu.org>]

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

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.
	* g++.dg/tm/pr46567.C (__is_pointer): Rename to ...
	(__is_ptr): ... this.
	* g++.dg/torture/20070621-1.C: Likewise.
	* g++.dg/torture/pr57107.C: Likewise.

libstdc++-v3/ChangeLog:

	* include/bits/cpp_type_traits.h (__is_pointer): Rename to ...
	(__is_ptr): ... this.
	* include/bits/deque.tcc: Use __is_ptr instead.
	* include/bits/stl_algobase.h: Likewise.

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 +++++++++++++++++++++
 gcc/testsuite/g++.dg/tm/pr46567.C           | 22 ++++-----
 gcc/testsuite/g++.dg/torture/20070621-1.C   |  4 +-
 gcc/testsuite/g++.dg/torture/pr57107.C      |  4 +-
 libstdc++-v3/include/bits/cpp_type_traits.h |  6 +--
 libstdc++-v3/include/bits/deque.tcc         |  6 +--
 libstdc++-v3/include/bits/stl_algobase.h    |  6 +--
 11 files changed, 86 insertions(+), 24 deletions(-)
 create mode 100644 gcc/testsuite/g++.dg/ext/is_pointer.C

diff --git a/gcc/cp/constraint.cc b/gcc/cp/constraint.cc
index 99a7e7247ce..c9d627fa782 100644
--- a/gcc/cp/constraint.cc
+++ b/gcc/cp/constraint.cc
@@ -3787,6 +3787,9 @@ 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 07cd14b6e85..bc2bb5e5abb 100644
--- a/gcc/cp/cp-trait.def
+++ b/gcc/cp/cp-trait.def
@@ -81,6 +81,7 @@ DEFTRAIT_EXPR (IS_NOTHROW_CONSTRUCTIBLE, "__is_nothrow_constructible", -1)
 DEFTRAIT_EXPR (IS_NOTHROW_CONVERTIBLE, "__is_nothrow_convertible", 2)
 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 4de2dbbf603..4b73863ec77 100644
--- a/gcc/cp/semantics.cc
+++ b/gcc/cp/semantics.cc
@@ -12196,6 +12196,9 @@ 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);
 
@@ -12397,6 +12400,7 @@ finish_trait_expr (location_t loc, cp_trait_kind kind, tree type1, tree type2)
     case CPTK_IS_MEMBER_FUNCTION_POINTER:
     case CPTK_IS_MEMBER_OBJECT_POINTER:
     case CPTK_IS_MEMBER_POINTER:
+    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 bcab0599d1a..efce04fd09d 100644
--- a/gcc/testsuite/g++.dg/ext/has-builtin-1.C
+++ b/gcc/testsuite/g++.dg/ext/has-builtin-1.C
@@ -122,6 +122,9 @@
 #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)));
diff --git a/gcc/testsuite/g++.dg/tm/pr46567.C b/gcc/testsuite/g++.dg/tm/pr46567.C
index 6d791484448..f08bbf6fd7b 100644
--- a/gcc/testsuite/g++.dg/tm/pr46567.C
+++ b/gcc/testsuite/g++.dg/tm/pr46567.C
@@ -192,13 +192,13 @@ namespace std __attribute__ ((__visibility__ ("default"))) {
       typedef __true_type __type;
     };
   template<typename _Tp>
-    struct __is_pointer
+    struct __is_ptr
     {
       enum { __value = 0 };
       typedef __false_type __type;
     };
   template<typename _Tp>
-    struct __is_pointer<_Tp*>
+    struct __is_ptr<_Tp*>
     {
       enum { __value = 1 };
       typedef __true_type __type;
@@ -226,7 +226,7 @@ namespace std __attribute__ ((__visibility__ ("default"))) {
     { };
   template<typename _Tp>
     struct __is_scalar
-    : public __traitor<__is_arithmetic<_Tp>, __is_pointer<_Tp> >
+    : public __traitor<__is_arithmetic<_Tp>, __is_ptr<_Tp> >
     { };
   template<typename _Tp>
     struct __is_char
@@ -1202,8 +1202,8 @@ namespace std __attribute__ ((__visibility__ ("default"))) {
       typedef typename iterator_traits<_OI>::value_type _ValueTypeO;
       typedef typename iterator_traits<_II>::iterator_category _Category;
       const bool __simple = (__is_pod(_ValueTypeI)
-		      && __is_pointer<_II>::__value
-		      && __is_pointer<_OI>::__value
+		      && __is_ptr<_II>::__value
+		      && __is_ptr<_OI>::__value
 	&& __are_same<_ValueTypeI, _ValueTypeO>::__value);
       return std::__copy_move<_IsMove, __simple,
 		       _Category>::__copy_m(__first, __last, __result);
@@ -1294,8 +1294,8 @@ namespace std __attribute__ ((__visibility__ ("default"))) {
       typedef typename iterator_traits<_BI2>::value_type _ValueType2;
       typedef typename iterator_traits<_BI1>::iterator_category _Category;
       const bool __simple = (__is_pod(_ValueType1)
-		      && __is_pointer<_BI1>::__value
-		      && __is_pointer<_BI2>::__value
+		      && __is_ptr<_BI1>::__value
+		      && __is_ptr<_BI2>::__value
 	&& __are_same<_ValueType1, _ValueType2>::__value);
       return std::__copy_move_backward<_IsMove, __simple,
 				_Category>::__copy_move_b(__first,
@@ -1426,8 +1426,8 @@ namespace std __attribute__ ((__visibility__ ("default"))) {
       typedef typename iterator_traits<_II1>::value_type _ValueType1;
       typedef typename iterator_traits<_II2>::value_type _ValueType2;
       const bool __simple = (__is_integer<_ValueType1>::__value
-		      && __is_pointer<_II1>::__value
-		      && __is_pointer<_II2>::__value
+		      && __is_ptr<_II1>::__value
+		      && __is_ptr<_II2>::__value
 	&& __are_same<_ValueType1, _ValueType2>::__value);
       return std::__equal<__simple>::equal(__first1, __last1, __first2);
     }
@@ -1515,8 +1515,8 @@ namespace std __attribute__ ((__visibility__ ("default"))) {
  (__is_byte<_ValueType1>::__value && __is_byte<_ValueType2>::__value
   && !__gnu_cxx::__numeric_traits<_ValueType1>::__is_signed
   && !__gnu_cxx::__numeric_traits<_ValueType2>::__is_signed
-  && __is_pointer<_II1>::__value
-  && __is_pointer<_II2>::__value);
+  && __is_ptr<_II1>::__value
+  && __is_ptr<_II2>::__value);
       return std::__lexicographical_compare<__simple>::__lc(__first1, __last1,
 	   __first2, __last2);
     }
diff --git a/gcc/testsuite/g++.dg/torture/20070621-1.C b/gcc/testsuite/g++.dg/torture/20070621-1.C
index d8a6a76b6b0..b05136163e8 100644
--- a/gcc/testsuite/g++.dg/torture/20070621-1.C
+++ b/gcc/testsuite/g++.dg/torture/20070621-1.C
@@ -18,7 +18,7 @@ namespace std __attribute__ ((__visibility__ ("default"))) {
         enum {
   __value = 0 };
       };
-    template<typename _Tp>     struct __is_pointer     {
+    template<typename _Tp>     struct __is_ptr     {
         enum {
   __value = 0 };
       };
@@ -49,7 +49,7 @@ namespace std __attribute__ ((__visibility__ ("default"))) {
     template<typename _II1, typename _II2>     inline bool     __equal_aux(_II1 __first1, _II1 __last1, _II2 __first2)     {
         typedef typename iterator_traits<_II1>::value_type _ValueType1;
         typedef typename iterator_traits<_II2>::value_type _ValueType2;
-        const bool __simple = (__is_integer<_ValueType1>::__value                       && __is_pointer<_II1>::__value                       && __is_pointer<_II2>::__value         && __are_same<_ValueType1, _ValueType2>::__value);
+        const bool __simple = (__is_integer<_ValueType1>::__value                       && __is_ptr<_II1>::__value                       && __is_ptr<_II2>::__value         && __are_same<_ValueType1, _ValueType2>::__value);
         return std::__equal<__simple>::equal(__first1, __last1, __first2);
       }
     template<typename _II1, typename _II2>     inline bool     equal(_II1 __first1, _II1 __last1, _II2 __first2)     {
diff --git a/gcc/testsuite/g++.dg/torture/pr57107.C b/gcc/testsuite/g++.dg/torture/pr57107.C
index 4dbd32bd298..be0689096fb 100644
--- a/gcc/testsuite/g++.dg/torture/pr57107.C
+++ b/gcc/testsuite/g++.dg/torture/pr57107.C
@@ -17,7 +17,7 @@ namespace std __attribute__ ((__visibility__ ("default"))) {
 	enum {
 	    __value = 0 };
     };
-    template<typename _Tp>     struct __is_pointer     {
+    template<typename _Tp>     struct __is_ptr     {
 	enum {
 	    __value = 0 };
     };
@@ -27,7 +27,7 @@ namespace std __attribute__ ((__visibility__ ("default"))) {
     };
     template<typename _Tp>     struct __is_arithmetic     : public __traitor<__is_integer<_Tp>, __is_floating<_Tp> >     {
     };
-    template<typename _Tp>     struct __is_scalar     : public __traitor<__is_arithmetic<_Tp>, __is_pointer<_Tp> >     {
+    template<typename _Tp>     struct __is_scalar     : public __traitor<__is_arithmetic<_Tp>, __is_ptr<_Tp> >     {
     };
 }
 namespace __gnu_cxx __attribute__ ((__visibility__ ("default"))) {
diff --git a/libstdc++-v3/include/bits/cpp_type_traits.h b/libstdc++-v3/include/bits/cpp_type_traits.h
index 4312f32a4e0..3711e4be526 100644
--- a/libstdc++-v3/include/bits/cpp_type_traits.h
+++ b/libstdc++-v3/include/bits/cpp_type_traits.h
@@ -364,14 +364,14 @@ __INT_N(__GLIBCXX_TYPE_INT_N_3)
   // Pointer types
   //
   template<typename _Tp>
-    struct __is_pointer
+    struct __is_ptr
     {
       enum { __value = 0 };
       typedef __false_type __type;
     };
 
   template<typename _Tp>
-    struct __is_pointer<_Tp*>
+    struct __is_ptr<_Tp*>
     {
       enum { __value = 1 };
       typedef __true_type __type;
@@ -390,7 +390,7 @@ __INT_N(__GLIBCXX_TYPE_INT_N_3)
   // 
   template<typename _Tp>
     struct __is_scalar
-    : public __traitor<__is_arithmetic<_Tp>, __is_pointer<_Tp> >
+    : public __traitor<__is_arithmetic<_Tp>, __is_ptr<_Tp> >
     { };
 
   //
diff --git a/libstdc++-v3/include/bits/deque.tcc b/libstdc++-v3/include/bits/deque.tcc
index a212b8a6940..08d888ee8af 100644
--- a/libstdc++-v3/include/bits/deque.tcc
+++ b/libstdc++-v3/include/bits/deque.tcc
@@ -1273,7 +1273,7 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
     {
       const bool __simple =
 	(__is_memcmp_ordered_with<_Tp1, _Tp2>::__value
-	 && __is_pointer<_Ptr>::__value
+	 && __is_ptr<_Ptr>::__value
 #if __cplusplus > 201703L && __cpp_lib_concepts
 	 // For C++20 iterator_traits<volatile T*>::value_type is non-volatile
 	 // so __is_byte<T> could be true, but we can't use memcmp with
@@ -1329,8 +1329,8 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
     {
       const bool __simple =
 	(__is_memcmp_ordered_with<_Tp1, _Tp2>::__value
-	 && __is_pointer<_Ptr1>::__value
-	 && __is_pointer<_Ptr2>::__value
+	 && __is_ptr<_Ptr1>::__value
+	 && __is_ptr<_Ptr2>::__value
 #if __cplusplus > 201703L && __cpp_lib_concepts
 	 // For C++20 iterator_traits<volatile T*>::value_type is non-volatile
 	 // so __is_byte<T> could be true, but we can't use memcmp with
diff --git a/libstdc++-v3/include/bits/stl_algobase.h b/libstdc++-v3/include/bits/stl_algobase.h
index 2f5a4bd4fd4..d1438429487 100644
--- a/libstdc++-v3/include/bits/stl_algobase.h
+++ b/libstdc++-v3/include/bits/stl_algobase.h
@@ -1217,7 +1217,7 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
     {
       typedef typename iterator_traits<_II1>::value_type _ValueType1;
       const bool __simple = ((__is_integer<_ValueType1>::__value
-			      || __is_pointer<_ValueType1>::__value)
+			      || __is_ptr<_ValueType1>::__value)
 			     && __memcmpable<_II1, _II2>::__value);
       return std::__equal<__simple>::equal(__first1, __last1, __first2);
     }
@@ -1380,8 +1380,8 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
       typedef typename iterator_traits<_II2>::value_type _ValueType2;
       const bool __simple =
 	(__is_memcmp_ordered_with<_ValueType1, _ValueType2>::__value
-	 && __is_pointer<_II1>::__value
-	 && __is_pointer<_II2>::__value
+	 && __is_ptr<_II1>::__value
+	 && __is_ptr<_II2>::__value
 #if __cplusplus > 201703L && __cpp_lib_concepts
 	 // For C++20 iterator_traits<volatile T*>::value_type is non-volatile
 	 // so __is_byte<T> could be true, but we can't use memcmp with
-- 
2.42.0