diff options
| author | Ken Matsui <kmatsui@gcc.gnu.org> | 2024-02-15 04:43:41 -0800 |
|---|---|---|
| committer | Ken Matsui <kmatsui@gcc.gnu.org> | 2024-05-10 18:17:32 -0700 |
| commit | 142d1d8e057c0e6da7f4e6eba4cc265c556d2dd8 (patch) | |
| tree | a81c87d47383b0e745676e3e3ca8f78e213feb72 /gcc | |
| parent | 85c2ba4244196dcccdf0647ff49f376c52513f65 (diff) | |
| download | gcc-142d1d8e057c0e6da7f4e6eba4cc265c556d2dd8.zip gcc-142d1d8e057c0e6da7f4e6eba4cc265c556d2dd8.tar.gz gcc-142d1d8e057c0e6da7f4e6eba4cc265c556d2dd8.tar.bz2 | |
c++: Implement __decay built-in trait
This patch implements built-in trait for std::decay.
gcc/cp/ChangeLog:
* cp-trait.def: Define __decay.
* semantics.cc (finish_trait_type): Handle CPTK_DECAY.
gcc/testsuite/ChangeLog:
* g++.dg/ext/has-builtin-1.C: Test existence of __decay.
* g++.dg/ext/decay.C: New test.
Signed-off-by: Ken Matsui <kmatsui@gcc.gnu.org>
Reviewed-by: Jason Merrill <jason@redhat.com>
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/cp/cp-trait.def | 1 | ||||
| -rw-r--r-- | gcc/cp/semantics.cc | 12 | ||||
| -rw-r--r-- | gcc/testsuite/g++.dg/ext/decay.C | 22 | ||||
| -rw-r--r-- | gcc/testsuite/g++.dg/ext/has-builtin-1.C | 3 |
4 files changed, 38 insertions, 0 deletions
diff --git a/gcc/cp/cp-trait.def b/gcc/cp/cp-trait.def index 173818a..2d1cb7c 100644 --- a/gcc/cp/cp-trait.def +++ b/gcc/cp/cp-trait.def @@ -51,6 +51,7 @@ DEFTRAIT_TYPE (ADD_LVALUE_REFERENCE, "__add_lvalue_reference", 1) DEFTRAIT_TYPE (ADD_POINTER, "__add_pointer", 1) DEFTRAIT_TYPE (ADD_RVALUE_REFERENCE, "__add_rvalue_reference", 1) +DEFTRAIT_TYPE (DECAY, "__decay", 1) DEFTRAIT_EXPR (HAS_NOTHROW_ASSIGN, "__has_nothrow_assign", 1) DEFTRAIT_EXPR (HAS_NOTHROW_CONSTRUCTOR, "__has_nothrow_constructor", 1) DEFTRAIT_EXPR (HAS_NOTHROW_COPY, "__has_nothrow_copy", 1) diff --git a/gcc/cp/semantics.cc b/gcc/cp/semantics.cc index f6338f7..d499b85 100644 --- a/gcc/cp/semantics.cc +++ b/gcc/cp/semantics.cc @@ -12946,6 +12946,18 @@ finish_trait_type (cp_trait_kind kind, tree type1, tree type2, return cp_build_reference_type (type1, /*rval=*/true); return type1; + case CPTK_DECAY: + if (TYPE_REF_P (type1)) + type1 = TREE_TYPE (type1); + + if (TREE_CODE (type1) == ARRAY_TYPE) + return finish_trait_type (CPTK_ADD_POINTER, TREE_TYPE (type1), type2, + complain); + else if (TREE_CODE (type1) == FUNCTION_TYPE) + return finish_trait_type (CPTK_ADD_POINTER, type1, type2, complain); + else + return cv_unqualified (type1); + case CPTK_REMOVE_ALL_EXTENTS: return strip_array_types (type1); diff --git a/gcc/testsuite/g++.dg/ext/decay.C b/gcc/testsuite/g++.dg/ext/decay.C new file mode 100644 index 0000000..8adedfe --- /dev/null +++ b/gcc/testsuite/g++.dg/ext/decay.C @@ -0,0 +1,22 @@ +// { dg-do compile { target c++11 } } + +#define SA(X) static_assert((X),#X) + +// Positive tests. +using test1_type = __decay(bool); +SA(__is_same(test1_type, bool)); + +// NB: DR 705. +using test2_type = __decay(const int); +SA(__is_same(test2_type, int)); + +using test3_type = __decay(int[4]); +SA(__is_same(test3_type, __remove_extent(int[4])*)); + +using fn_type = void (); +using test4_type = __decay(fn_type); +SA(__is_same(test4_type, __add_pointer(fn_type))); + +using cfn_type = void () const; +using test5_type = __decay(cfn_type); +SA(__is_same(test5_type, cfn_type)); diff --git a/gcc/testsuite/g++.dg/ext/has-builtin-1.C b/gcc/testsuite/g++.dg/ext/has-builtin-1.C index 266cb35..d2e6a5b 100644 --- a/gcc/testsuite/g++.dg/ext/has-builtin-1.C +++ b/gcc/testsuite/g++.dg/ext/has-builtin-1.C @@ -32,6 +32,9 @@ #if !__has_builtin (__builtin_source_location) # error "__has_builtin (__builtin_source_location) failed" #endif +#if !__has_builtin (__decay) +# error "__has_builtin (__decay) failed" +#endif #if !__has_builtin (__has_nothrow_assign) # error "__has_builtin (__has_nothrow_assign) failed" #endif |