c++: Fix ICE in eval_annotations_of [PR123866]

eval_annotations_of throws if the passed in reflection handle is not
eval_is_function (and various others).  Now, eval_is_function uses
maybe_get_first_fn to look through BASELINK/OVERLOAD etc., but
eval_annotations_of wasn't doing that and ICEd on
  else if (TYPE_P (r))
    r = TYPE_ATTRIBUTES (r);
  else if (DECL_P (r))
    r = DECL_ATTRIBUTES (r);
  else
    gcc_unreachable ();
because r isn't a decl nor type (nor REFLECT_BASE earlier).

2026-01-29  Jakub Jelinek  <jakub@redhat.com>

	PR c++/123866
	* reflect.cc (eval_annotations_of): Use maybe_get_first_fn.

	* g++.dg/reflect/annotations10.C: New test.

diff --git a/gcc/cp/reflect.cc b/gcc/cp/reflect.cc
index bdeec2f0f38c850e41913d914a5f745d6998fb3e..8acac9f8f0ea8bc76e3caea79bd538d7703715b8 100644 (file)
--- a/gcc/cp/reflect.cc
+++ b/gcc/cp/reflect.cc
@@ -3768,6 +3768,7 @@ eval_annotations_of (location_t loc, const constexpr_ctx *ctx, tree r,
       type = remove_const (type);
     }
 
+  r = maybe_get_first_fn (r);
   if (kind == REFLECT_BASE)
     {
       gcc_assert (TREE_CODE (r) == TREE_BINFO);

diff --git a/gcc/testsuite/g++.dg/reflect/annotations10.C b/gcc/testsuite/g++.dg/reflect/annotations10.C
new file mode 100644 (file)
index 0000000..e78a7d4
--- /dev/null
+++ b/gcc/testsuite/g++.dg/reflect/annotations10.C
@@ -0,0 +1,12 @@
+// PR c++/123866
+// { dg-do compile { target c++26 } }
+// { dg-additional-options "-freflection" }
+
+#include <meta>
+
+struct A
+{
+  [[=1, =2]] void foo () {}
+};
+
+static_assert (annotations_of (^^A::foo).size () == 2);