[PATCH v16 21/39] c++: Implement __is_reference built-in trait
Ken Matsui
kmatsui@gcc.gnu.org
Tue Oct 10 22:10:12 GMT 2023
This patch implements built-in trait for std::is_reference.
gcc/cp/ChangeLog:
* cp-trait.def: Define __is_reference.
* cp-trait.gperf: Reflect cp-trait.def change.
* cp-trait.h: Likewise.
* constraint.cc (diagnose_trait_expr): Handle CPTK_IS_REFERENCE.
* semantics.cc (trait_expr_value): Likewise.
(finish_trait_expr): Likewise.
gcc/testsuite/ChangeLog:
* g++.dg/ext/has-builtin-1.C: Test existence of __is_reference.
* g++.dg/ext/is_reference.C: New test.
Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
---
gcc/cp/constraint.cc | 3 +
gcc/cp/cp-trait.def | 1 +
gcc/cp/cp-trait.gperf | 1 +
gcc/cp/cp-trait.h | 113 ++++++++++++-----------
gcc/cp/semantics.cc | 4 +
gcc/testsuite/g++.dg/ext/has-builtin-1.C | 3 +
gcc/testsuite/g++.dg/ext/is_reference.C | 34 +++++++
7 files changed, 104 insertions(+), 55 deletions(-)
create mode 100644 gcc/testsuite/g++.dg/ext/is_reference.C
diff --git a/gcc/cp/constraint.cc b/gcc/cp/constraint.cc
index 98b1f004a68..5cdb59d174e 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_POLYMORPHIC:
inform (loc, " %qT is not a polymorphic type", t1);
break;
+ case CPTK_IS_REFERENCE:
+ inform (loc, " %qT is not a reference", t1);
+ break;
case CPTK_IS_SAME:
inform (loc, " %qT is not the same as %qT", t1, t2);
break;
diff --git a/gcc/cp/cp-trait.def b/gcc/cp/cp-trait.def
index 11fd70b3964..e867d9c4c47 100644
--- a/gcc/cp/cp-trait.def
+++ b/gcc/cp/cp-trait.def
@@ -81,6 +81,7 @@ 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_POLYMORPHIC, "__is_polymorphic", 1)
+DEFTRAIT_EXPR (IS_REFERENCE, "__is_reference", 1)
DEFTRAIT_EXPR (IS_SAME, "__is_same", 2)
DEFTRAIT_EXPR (IS_SCOPED_ENUM, "__is_scoped_enum", 1)
DEFTRAIT_EXPR (IS_STD_LAYOUT, "__is_standard_layout", 1)
diff --git a/gcc/cp/cp-trait.gperf b/gcc/cp/cp-trait.gperf
index 32199a1fe9a..5989b84727f 100644
--- a/gcc/cp/cp-trait.gperf
+++ b/gcc/cp/cp-trait.gperf
@@ -61,6 +61,7 @@ struct cp_trait {
"__is_pointer_interconvertible_base_of", CPTK_IS_POINTER_INTERCONVERTIBLE_BASE_OF, 2, false
"__is_pod", CPTK_IS_POD, 1, false
"__is_polymorphic", CPTK_IS_POLYMORPHIC, 1, false
+"__is_reference", CPTK_IS_REFERENCE, 1, false
"__is_same", CPTK_IS_SAME, 2, false
"__is_scoped_enum", CPTK_IS_SCOPED_ENUM, 1, false
"__is_standard_layout", CPTK_IS_STD_LAYOUT, 1, false
diff --git a/gcc/cp/cp-trait.h b/gcc/cp/cp-trait.h
index 799fe2b792f..f0b4f96d4a9 100644
--- a/gcc/cp/cp-trait.h
+++ b/gcc/cp/cp-trait.h
@@ -54,7 +54,7 @@ struct cp_trait {
short arity;
bool type;
};
-/* maximum key range = 89, duplicates = 0 */
+/* maximum key range = 94, duplicates = 0 */
class cp_trait_lookup
{
@@ -69,32 +69,32 @@ cp_trait_lookup::hash (const char *str, size_t len)
{
static const unsigned char asso_values[] =
{
- 96, 96, 96, 96, 96, 96, 96, 96, 96, 96,
- 96, 96, 96, 96, 96, 96, 96, 96, 96, 96,
- 96, 96, 96, 96, 96, 96, 96, 96, 96, 96,
- 96, 96, 96, 96, 96, 96, 96, 96, 96, 96,
- 96, 96, 96, 96, 96, 96, 96, 96, 96, 96,
- 96, 96, 96, 96, 96, 96, 96, 96, 96, 96,
- 96, 96, 96, 96, 96, 96, 96, 96, 96, 96,
- 96, 96, 96, 96, 96, 96, 96, 96, 96, 96,
- 96, 96, 96, 96, 96, 96, 96, 96, 96, 96,
- 96, 96, 96, 96, 96, 20, 96, 40, 5, 40,
- 40, 0, 25, 10, 96, 0, 96, 96, 5, 25,
- 30, 0, 5, 96, 10, 15, 5, 0, 25, 96,
- 96, 20, 96, 96, 96, 96, 96, 96, 96, 96,
- 96, 96, 96, 96, 96, 96, 96, 96, 96, 96,
- 96, 96, 96, 96, 96, 96, 96, 96, 96, 96,
- 96, 96, 96, 96, 96, 96, 96, 96, 96, 96,
- 96, 96, 96, 96, 96, 96, 96, 96, 96, 96,
- 96, 96, 96, 96, 96, 96, 96, 96, 96, 96,
- 96, 96, 96, 96, 96, 96, 96, 96, 96, 96,
- 96, 96, 96, 96, 96, 96, 96, 96, 96, 96,
- 96, 96, 96, 96, 96, 96, 96, 96, 96, 96,
- 96, 96, 96, 96, 96, 96, 96, 96, 96, 96,
- 96, 96, 96, 96, 96, 96, 96, 96, 96, 96,
- 96, 96, 96, 96, 96, 96, 96, 96, 96, 96,
- 96, 96, 96, 96, 96, 96, 96, 96, 96, 96,
- 96, 96, 96, 96, 96, 96
+ 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
+ 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
+ 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
+ 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
+ 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
+ 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
+ 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
+ 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
+ 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
+ 101, 101, 101, 101, 101, 20, 101, 40, 5, 40,
+ 40, 0, 60, 10, 101, 0, 101, 101, 5, 25,
+ 30, 0, 5, 101, 10, 15, 5, 0, 25, 101,
+ 101, 20, 101, 101, 101, 101, 101, 101, 101, 101,
+ 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
+ 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
+ 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
+ 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
+ 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
+ 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
+ 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
+ 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
+ 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
+ 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
+ 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
+ 101, 101, 101, 101, 101, 101, 101, 101, 101, 101,
+ 101, 101, 101, 101, 101, 101
};
unsigned int hval = len;
@@ -116,58 +116,58 @@ cp_trait_lookup::find (const char *str, size_t len)
{
enum
{
- TOTAL_KEYWORDS = 54,
+ TOTAL_KEYWORDS = 55,
MIN_WORD_LENGTH = 7,
MAX_WORD_LENGTH = 37,
MIN_HASH_VALUE = 7,
- MAX_HASH_VALUE = 95
+ MAX_HASH_VALUE = 100
};
static const struct cp_trait wordlist[] =
{
-#line 82 "../../gcc/cp/cp-trait.gperf"
+#line 83 "../../gcc/cp/cp-trait.gperf"
{"__bases", CPTK_BASES, 1, true},
#line 51 "../../gcc/cp/cp-trait.gperf"
{"__is_enum", CPTK_IS_ENUM, 1, false},
-#line 72 "../../gcc/cp/cp-trait.gperf"
+#line 73 "../../gcc/cp/cp-trait.gperf"
{"__is_union", CPTK_IS_UNION, 1, false},
-#line 76 "../../gcc/cp/cp-trait.gperf"
- {"__remove_cv", CPTK_REMOVE_CV, 1, true},
#line 77 "../../gcc/cp/cp-trait.gperf"
+ {"__remove_cv", CPTK_REMOVE_CV, 1, true},
+#line 78 "../../gcc/cp/cp-trait.gperf"
{"__remove_cvref", CPTK_REMOVE_CVREF, 1, true},
#line 50 "../../gcc/cp/cp-trait.gperf"
{"__is_empty", CPTK_IS_EMPTY, 1, false},
-#line 67 "../../gcc/cp/cp-trait.gperf"
+#line 68 "../../gcc/cp/cp-trait.gperf"
{"__is_trivial", CPTK_IS_TRIVIAL, 1, false},
-#line 78 "../../gcc/cp/cp-trait.gperf"
+#line 79 "../../gcc/cp/cp-trait.gperf"
{"__remove_reference", CPTK_REMOVE_REFERENCE, 1, true},
-#line 83 "../../gcc/cp/cp-trait.gperf"
+#line 84 "../../gcc/cp/cp-trait.gperf"
{"__direct_bases", CPTK_DIRECT_BASES, 1, true},
-#line 80 "../../gcc/cp/cp-trait.gperf"
+#line 81 "../../gcc/cp/cp-trait.gperf"
{"__underlying_type", CPTK_UNDERLYING_TYPE, 1, true},
#line 45 "../../gcc/cp/cp-trait.gperf"
{"__is_bounded_array", CPTK_IS_BOUNDED_ARRAY, 1, false},
-#line 79 "../../gcc/cp/cp-trait.gperf"
+#line 80 "../../gcc/cp/cp-trait.gperf"
{"__type_pack_element", CPTK_TYPE_PACK_ELEMENT, -1, true},
-#line 71 "../../gcc/cp/cp-trait.gperf"
+#line 72 "../../gcc/cp/cp-trait.gperf"
{"__is_unbounded_array", CPTK_IS_UNBOUNDED_ARRAY, 1, false},
#line 63 "../../gcc/cp/cp-trait.gperf"
{"__is_polymorphic", CPTK_IS_POLYMORPHIC, 1, false},
#line 54 "../../gcc/cp/cp-trait.gperf"
{"__is_literal_type", CPTK_IS_LITERAL_TYPE, 1, false},
-#line 70 "../../gcc/cp/cp-trait.gperf"
+#line 71 "../../gcc/cp/cp-trait.gperf"
{"__is_trivially_copyable", CPTK_IS_TRIVIALLY_COPYABLE, 1, false},
-#line 68 "../../gcc/cp/cp-trait.gperf"
+#line 69 "../../gcc/cp/cp-trait.gperf"
{"__is_trivially_assignable", CPTK_IS_TRIVIALLY_ASSIGNABLE, 2, false},
-#line 65 "../../gcc/cp/cp-trait.gperf"
+#line 66 "../../gcc/cp/cp-trait.gperf"
{"__is_scoped_enum", CPTK_IS_SCOPED_ENUM, 1, false},
#line 44 "../../gcc/cp/cp-trait.gperf"
{"__is_base_of", CPTK_IS_BASE_OF, 2, false},
-#line 69 "../../gcc/cp/cp-trait.gperf"
+#line 70 "../../gcc/cp/cp-trait.gperf"
{"__is_trivially_constructible", CPTK_IS_TRIVIALLY_CONSTRUCTIBLE, -1, false},
-#line 75 "../../gcc/cp/cp-trait.gperf"
+#line 76 "../../gcc/cp/cp-trait.gperf"
{"__reference_converts_from_temporary", CPTK_REF_CONVERTS_FROM_TEMPORARY, 2, false},
-#line 74 "../../gcc/cp/cp-trait.gperf"
+#line 75 "../../gcc/cp/cp-trait.gperf"
{"__reference_constructs_from_temporary", CPTK_REF_CONSTRUCTS_FROM_TEMPORARY, 2, false},
#line 33 "../../gcc/cp/cp-trait.gperf"
{"__has_nothrow_copy", CPTK_HAS_NOTHROW_COPY, 1, false},
@@ -175,7 +175,7 @@ cp_trait_lookup::find (const char *str, size_t len)
{"__has_nothrow_assign", CPTK_HAS_NOTHROW_ASSIGN, 1, false},
#line 61 "../../gcc/cp/cp-trait.gperf"
{"__is_pointer_interconvertible_base_of", CPTK_IS_POINTER_INTERCONVERTIBLE_BASE_OF, 2, false},
-#line 73 "../../gcc/cp/cp-trait.gperf"
+#line 74 "../../gcc/cp/cp-trait.gperf"
{"__is_volatile", CPTK_IS_VOLATILE, 1, false},
#line 39 "../../gcc/cp/cp-trait.gperf"
{"__has_virtual_destructor", CPTK_HAS_VIRTUAL_DESTRUCTOR, 1, false},
@@ -185,7 +185,7 @@ cp_trait_lookup::find (const char *str, size_t len)
{"__is_layout_compatible", CPTK_IS_LAYOUT_COMPATIBLE, 2, false},
#line 36 "../../gcc/cp/cp-trait.gperf"
{"__has_trivial_copy", CPTK_HAS_TRIVIAL_COPY, 1, false},
-#line 64 "../../gcc/cp/cp-trait.gperf"
+#line 65 "../../gcc/cp/cp-trait.gperf"
{"__is_same", CPTK_IS_SAME, 2, false},
#line 34 "../../gcc/cp/cp-trait.gperf"
{"__has_trivial_assign", CPTK_HAS_TRIVIAL_ASSIGN, 1, false},
@@ -207,15 +207,13 @@ cp_trait_lookup::find (const char *str, size_t len)
{"__is_nothrow_constructible", CPTK_IS_NOTHROW_CONSTRUCTIBLE, -1, false},
#line 41 "../../gcc/cp/cp-trait.gperf"
{"__is_aggregate", CPTK_IS_AGGREGATE, 1, false},
-#line 52 "../../gcc/cp/cp-trait.gperf"
- {"__is_final", CPTK_IS_FINAL, 1, false},
#line 40 "../../gcc/cp/cp-trait.gperf"
{"__is_abstract", CPTK_IS_ABSTRACT, 1, false},
#line 57 "../../gcc/cp/cp-trait.gperf"
{"__is_member_pointer", CPTK_IS_MEMBER_POINTER, 1, false},
#line 43 "../../gcc/cp/cp-trait.gperf"
{"__is_assignable", CPTK_IS_ASSIGNABLE, 2, false},
-#line 66 "../../gcc/cp/cp-trait.gperf"
+#line 67 "../../gcc/cp/cp-trait.gperf"
{"__is_standard_layout", CPTK_IS_STD_LAYOUT, 1, false},
#line 56 "../../gcc/cp/cp-trait.gperf"
{"__is_member_object_pointer", CPTK_IS_MEMBER_OBJECT_POINTER, 1, false},
@@ -223,6 +221,8 @@ cp_trait_lookup::find (const char *str, size_t len)
{"__is_member_function_pointer", CPTK_IS_MEMBER_FUNCTION_POINTER, 1, false},
#line 47 "../../gcc/cp/cp-trait.gperf"
{"__is_const", CPTK_IS_CONST, 1, false},
+#line 64 "../../gcc/cp/cp-trait.gperf"
+ {"__is_reference", CPTK_IS_REFERENCE, 1, false},
#line 38 "../../gcc/cp/cp-trait.gperf"
{"__has_unique_object_representations", CPTK_HAS_UNIQUE_OBJ_REPRESENTATIONS, 1, false},
#line 49 "../../gcc/cp/cp-trait.gperf"
@@ -231,8 +231,10 @@ cp_trait_lookup::find (const char *str, size_t len)
{"__is_constructible", CPTK_IS_CONSTRUCTIBLE, -1, false},
#line 46 "../../gcc/cp/cp-trait.gperf"
{"__is_class", CPTK_IS_CLASS, 1, false},
-#line 81 "../../gcc/cp/cp-trait.gperf"
- {"__is_deducible ", CPTK_IS_DEDUCIBLE, 2, false}
+#line 82 "../../gcc/cp/cp-trait.gperf"
+ {"__is_deducible ", CPTK_IS_DEDUCIBLE, 2, false},
+#line 52 "../../gcc/cp/cp-trait.gperf"
+ {"__is_final", CPTK_IS_FINAL, 1, false}
};
static const signed char lookup[] =
@@ -241,9 +243,10 @@ cp_trait_lookup::find (const char *str, size_t len)
4, 5, -1, 6, 7, 8, -1, -1, 9, 10, 11, 12, 13, 14,
15, -1, 16, 17, 18, 19, -1, 20, -1, 21, 22, -1, 23, -1,
24, 25, 26, 27, -1, 28, 29, 30, 31, -1, 32, 33, 34, 35,
- -1, -1, 36, 37, 38, 39, -1, -1, 40, 41, -1, -1, 42, 43,
- 44, -1, -1, -1, -1, 45, 46, -1, 47, -1, 48, -1, -1, -1,
- -1, 49, 50, -1, 51, -1, 52, -1, -1, -1, -1, 53
+ -1, -1, 36, 37, 38, 39, -1, -1, 40, -1, -1, -1, 41, 42,
+ 43, -1, -1, -1, -1, 44, 45, -1, 46, -1, 47, -1, -1, -1,
+ 48, 49, 50, -1, 51, -1, 52, -1, -1, -1, -1, 53, -1, -1,
+ -1, -1, 54
};
if (len <= MAX_WORD_LENGTH && len >= MIN_WORD_LENGTH)
diff --git a/gcc/cp/semantics.cc b/gcc/cp/semantics.cc
index 9cbb434d4c2..df720459458 100644
--- a/gcc/cp/semantics.cc
+++ b/gcc/cp/semantics.cc
@@ -12211,6 +12211,9 @@ trait_expr_value (cp_trait_kind kind, tree type1, tree type2)
case CPTK_IS_POLYMORPHIC:
return CLASS_TYPE_P (type1) && TYPE_POLYMORPHIC_P (type1);
+ case CPTK_IS_REFERENCE:
+ return type_code1 == REFERENCE_TYPE;
+
case CPTK_IS_SAME:
return same_type_p (type1, type2);
@@ -12405,6 +12408,7 @@ 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_REFERENCE:
case CPTK_IS_SAME:
case CPTK_IS_SCOPED_ENUM:
case CPTK_IS_UNBOUNDED_ARRAY:
diff --git a/gcc/testsuite/g++.dg/ext/has-builtin-1.C b/gcc/testsuite/g++.dg/ext/has-builtin-1.C
index 8d9cdc528cd..e112d317657 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_polymorphic)
# error "__has_builtin (__is_polymorphic) failed"
#endif
+#if !__has_builtin (__is_reference)
+# error "__has_builtin (__is_reference) failed"
+#endif
#if !__has_builtin (__is_same)
# error "__has_builtin (__is_same) failed"
#endif
diff --git a/gcc/testsuite/g++.dg/ext/is_reference.C b/gcc/testsuite/g++.dg/ext/is_reference.C
new file mode 100644
index 00000000000..b5ce4db7afd
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/is_reference.C
@@ -0,0 +1,34 @@
+// { dg-do compile { target c++11 } }
+
+#include <testsuite_tr1.h>
+
+using namespace __gnu_test;
+
+#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)
+
+// Positive tests.
+SA_TEST_CATEGORY(__is_reference, int&, true);
+SA_TEST_CATEGORY(__is_reference, ClassType&, true);
+SA(__is_reference(int(&)(int)));
+SA_TEST_CATEGORY(__is_reference, int&&, true);
+SA_TEST_CATEGORY(__is_reference, ClassType&&, true);
+SA(__is_reference(int(&&)(int)));
+SA_TEST_CATEGORY(__is_reference, IncompleteClass&, true);
+
+// Negative tests
+SA_TEST_CATEGORY(__is_reference, void, false);
+SA_TEST_CATEGORY(__is_reference, int*, false);
+SA_TEST_CATEGORY(__is_reference, int[3], false);
+SA(!__is_reference(int(int)));
+SA(!__is_reference(int(*const)(int)));
+SA(!__is_reference(int(*volatile)(int)));
+SA(!__is_reference(int(*const volatile)(int)));
+
+// Sanity check.
+SA_TEST_CATEGORY(__is_reference, ClassType, false);
+SA_TEST_CATEGORY(__is_reference, IncompleteClass, false);
--
2.42.0
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