[PATCH 1/2] c++: implement __is_volatile built-in trait

[Ken Matsui via Gcc-patches]

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

gcc/cp/ChangeLog:

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

gcc/testsuite/ChangeLog:

        * g++.dg/ext/has-builtin-1.C: Test existence of __is_volatile.
        * g++.dg/ext/is_volatile.C: New test.
---
 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_volatile.C   | 19 +++++++++++++++++++
 5 files changed, 30 insertions(+)
 create mode 100644 gcc/testsuite/g++.dg/ext/is_volatile.C

diff --git a/gcc/cp/constraint.cc b/gcc/cp/constraint.cc
index 273d15ab097..1da8e8a9780 100644
--- a/gcc/cp/constraint.cc
+++ b/gcc/cp/constraint.cc
@@ -3747,6 +3747,9 @@ diagnose_trait_expr (tree expr, tree args)
     case CPTK_IS_UNION:
       inform (loc, "  %qT is not a union", t1);
       break;
+    case CPTK_IS_VOLATILE:
+      inform (loc, "  %qT is not a volatile type", t1);
+      break;
     case CPTK_IS_AGGREGATE:
       inform (loc, "  %qT is not an aggregate", t1);
       break;
diff --git a/gcc/cp/cp-trait.def b/gcc/cp/cp-trait.def
index bac593c0094..b89b82bb26b 100644
--- a/gcc/cp/cp-trait.def
+++ b/gcc/cp/cp-trait.def
@@ -82,6 +82,7 @@ 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_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)
 /* FIXME Added space to avoid direct usage in GCC 13.  */
diff --git a/gcc/cp/semantics.cc b/gcc/cp/semantics.cc
index 99a76e3ed65..70ea0e83abb 100644
--- a/gcc/cp/semantics.cc
+++ b/gcc/cp/semantics.cc
@@ -11993,6 +11993,9 @@ trait_expr_value (cp_trait_kind kind, tree type1, tree 
type2)
     case CPTK_IS_ENUM:
       return type_code1 == ENUMERAL_TYPE;
 
+    case CPTK_IS_VOLATILE:
+      return CP_TYPE_VOLATILE_P (type1);
+
     case CPTK_IS_FINAL:
       return CLASS_TYPE_P (type1) && CLASSTYPE_FINAL (type1);
 
@@ -12201,6 +12204,7 @@ finish_trait_expr (location_t loc, cp_trait_kind kind, 
tree type1, tree type2)
     case CPTK_IS_ENUM:
     case CPTK_IS_UNION:
     case CPTK_IS_SAME:
+    case CPTK_IS_VOLATILE:
       break;
 
     case CPTK_IS_LAYOUT_COMPATIBLE:
diff --git a/gcc/testsuite/g++.dg/ext/has-builtin-1.C 
b/gcc/testsuite/g++.dg/ext/has-builtin-1.C
index f343e153e56..7ad640f141b 100644
--- a/gcc/testsuite/g++.dg/ext/has-builtin-1.C
+++ b/gcc/testsuite/g++.dg/ext/has-builtin-1.C
@@ -146,3 +146,6 @@
 #if !__has_builtin (__remove_cvref)
 # error "__has_builtin (__remove_cvref) failed"
 #endif
+#if !__has_builtin (__is_volatile)
+# error "__has_builtin (__is_volatile) failed"
+#endif
diff --git a/gcc/testsuite/g++.dg/ext/is_volatile.C 
b/gcc/testsuite/g++.dg/ext/is_volatile.C
new file mode 100644
index 00000000000..004e397e5e7
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/is_volatile.C
@@ -0,0 +1,19 @@
+// { dg-do compile { target c++11 } }
+
+#include <testsuite_tr1.h>
+
+using namespace __gnu_test;
+
+#define SA(X) static_assert((X),#X)
+
+// Positive tests.
+SA(__is_volatile(volatile int));
+SA(__is_volatile(const volatile int));
+SA(__is_volatile(vClassType));
+SA(__is_volatile(cvClassType));
+
+// Negative tests.
+SA(!__is_volatile(int));
+SA(!__is_volatile(const int));
+SA(!__is_volatile(ClassType));
+SA(!__is_volatile(cClassType));
-- 
2.40.0