c++: ICE with __has_unique_object_representations [PR115476]releases/gcc-14

Here we started to ICE with r13-25: in check_trait_type, for "X[]" we
return true here:

  if (kind == 1 && TREE_CODE (type) == ARRAY_TYPE && !TYPE_DOMAIN (type))
    return true; // Array of unknown bound. Don't care about completeness.

and then end up crashing in record_has_unique_obj_representations:

4836	  if (cur != wi::to_offset (sz))

because sz is null.

https://eel.is/c++draft/type.traits#tab:meta.unary.prop-row-47-column-3-sentence-1
says that the preconditions for __has_unique_object_representations are:
"T shall be a complete type, cv void, or an array of unknown bound" and
that "For an array type T, the same result as
has_unique_object_representations_v<remove_all_extents_t<T>>" so T[]
should be treated as T.  So we should use kind==2 for the trait.

	PR c++/115476

gcc/cp/ChangeLog:

	* semantics.cc (finish_trait_expr)
	<case CPTK_HAS_UNIQUE_OBJ_REPRESENTATIONS>: Move below to call
	check_trait_type with kind==2.

gcc/testsuite/ChangeLog:

	* g++.dg/cpp1z/has-unique-obj-representations4.C: New test.

(cherry picked from commit fc382a373e6824bb998007d1dcb0805b0cf4b8e8)

0 files changed, 0 insertions, 0 deletions