On 2/28/24 11:26, Ken Matsui wrote:
This patch implements built-in trait for std::is_const.
OK.
gcc/cp/ChangeLog: * cp-trait.def: Define __is_const. * constraint.cc (diagnose_trait_expr): Handle CPTK_IS_CONST. * semantics.cc (trait_expr_value): Likewise. (finish_trait_expr): Likewise. gcc/testsuite/ChangeLog: * g++.dg/ext/has-builtin-1.C: Test existence of __is_const. * g++.dg/ext/is_const.C: New test. Signed-off-by: Ken Matsui <kmat...@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_const.C | 20 ++++++++++++++++++++ 5 files changed, 31 insertions(+) create mode 100644 gcc/testsuite/g++.dg/ext/is_const.C diff --git a/gcc/cp/constraint.cc b/gcc/cp/constraint.cc index 49de3211d4c..f32a1c78d63 100644 --- a/gcc/cp/constraint.cc +++ b/gcc/cp/constraint.cc @@ -3767,6 +3767,9 @@ diagnose_trait_expr (tree expr, tree args) case CPTK_IS_CLASS: inform (loc, " %qT is not a class", t1); break; + case CPTK_IS_CONST: + inform (loc, " %qT is not a const type", t1); + break; case CPTK_IS_CONSTRUCTIBLE: if (!t2) inform (loc, " %qT is not default constructible", t1); diff --git a/gcc/cp/cp-trait.def b/gcc/cp/cp-trait.def index 394f006f20f..36faed9c0b3 100644 --- a/gcc/cp/cp-trait.def +++ b/gcc/cp/cp-trait.def @@ -64,6 +64,7 @@ DEFTRAIT_EXPR (IS_ASSIGNABLE, "__is_assignable", 2) DEFTRAIT_EXPR (IS_BASE_OF, "__is_base_of", 2) DEFTRAIT_EXPR (IS_BOUNDED_ARRAY, "__is_bounded_array", 1) DEFTRAIT_EXPR (IS_CLASS, "__is_class", 1) +DEFTRAIT_EXPR (IS_CONST, "__is_const", 1) DEFTRAIT_EXPR (IS_CONSTRUCTIBLE, "__is_constructible", -1) DEFTRAIT_EXPR (IS_CONVERTIBLE, "__is_convertible", 2) DEFTRAIT_EXPR (IS_EMPTY, "__is_empty", 1) diff --git a/gcc/cp/semantics.cc b/gcc/cp/semantics.cc index 57840176863..0d08900492b 100644 --- a/gcc/cp/semantics.cc +++ b/gcc/cp/semantics.cc @@ -12446,6 +12446,9 @@ trait_expr_value (cp_trait_kind kind, tree type1, tree type2) case CPTK_IS_CLASS: return NON_UNION_CLASS_TYPE_P (type1);+ case CPTK_IS_CONST:+ return CP_TYPE_CONST_P (type1); + case CPTK_IS_CONSTRUCTIBLE: return is_xible (INIT_EXPR, type1, type2);@@ -12688,6 +12691,7 @@ finish_trait_expr (location_t loc, cp_trait_kind kind, tree type1, tree type2)case CPTK_IS_ARRAY: case CPTK_IS_BOUNDED_ARRAY: case CPTK_IS_CLASS: + case CPTK_IS_CONST: case CPTK_IS_ENUM: case CPTK_IS_FUNCTION: case CPTK_IS_MEMBER_FUNCTION_POINTER: diff --git a/gcc/testsuite/g++.dg/ext/has-builtin-1.C b/gcc/testsuite/g++.dg/ext/has-builtin-1.C index 02b4b4d745d..e3640faeb96 100644 --- a/gcc/testsuite/g++.dg/ext/has-builtin-1.C +++ b/gcc/testsuite/g++.dg/ext/has-builtin-1.C @@ -71,6 +71,9 @@ #if !__has_builtin (__is_class) # error "__has_builtin (__is_class) failed" #endif +#if !__has_builtin (__is_const) +# error "__has_builtin (__is_const) failed" +#endif #if !__has_builtin (__is_constructible) # error "__has_builtin (__is_constructible) failed" #endif diff --git a/gcc/testsuite/g++.dg/ext/is_const.C b/gcc/testsuite/g++.dg/ext/is_const.C new file mode 100644 index 00000000000..8a0e8df72a9 --- /dev/null +++ b/gcc/testsuite/g++.dg/ext/is_const.C @@ -0,0 +1,20 @@ +// { dg-do compile { target c++11 } } + +#define SA(X) static_assert((X),#X) + +class ClassType { }; +using cClassType = const ClassType; +using vClassType = volatile ClassType; +using cvClassType = const volatile ClassType; + +// Positive tests. +SA(__is_const(const int)); +SA(__is_const(const volatile int)); +SA(__is_const(cClassType)); +SA(__is_const(cvClassType)); + +// Negative tests. +SA(!__is_const(int)); +SA(!__is_const(volatile int)); +SA(!__is_const(ClassType)); +SA(!__is_const(vClassType));
