On 3/15/24 01:15, Ken Matsui wrote:
Added diagnostics for build_invoke.
Ok for 15?
Thanks, just a few tweaks needed. Will you have time to make them? Or
Patrick?
[...]
diff --git a/gcc/cp/method.cc b/gcc/cp/method.cc
index 98c10e6a8b5..2282ce71c06 100644
--- a/gcc/cp/method.cc
+++ b/gcc/cp/method.cc
@@ -1928,6 +1928,162 @@ build_trait_object (tree type)
return build_stub_object (type);
}
+/* [func.require] Build an expression of INVOKE(FN_TYPE, ARG_TYPES...). If the
+ given is not invocable, returns error_mark_node. */
+
+tree
+build_invoke (tree fn_type, const_tree arg_types, tsubst_flags_t complain)
+{
+ if (error_operand_p (fn_type) || error_operand_p (arg_types))
+ return error_mark_node;
+
+ gcc_assert (TYPE_P (fn_type));
+ gcc_assert (TREE_CODE (arg_types) == TREE_VEC);
+
+ /* Access check is required to determine if the given is invocable. */
+ deferring_access_check_sentinel acs (dk_no_deferred);
+
+ /* INVOKE is an unevaluated context. */
+ cp_unevaluated cp_uneval_guard;
+
+ bool is_ptrdatamem;
+ bool is_ptrmemfunc;
+ if (TREE_CODE (fn_type) == REFERENCE_TYPE)
+ {
+ tree deref_fn_type = TREE_TYPE (fn_type);
+ is_ptrdatamem = TYPE_PTRDATAMEM_P (deref_fn_type);
+ is_ptrmemfunc = TYPE_PTRMEMFUNC_P (deref_fn_type);
+
+ /* Dereference fn_type if it is a pointer to member. */
+ if (is_ptrdatamem || is_ptrmemfunc)
+ fn_type = deref_fn_type;
+ }
+ else
+ {
+ is_ptrdatamem = TYPE_PTRDATAMEM_P (fn_type);
+ is_ptrmemfunc = TYPE_PTRMEMFUNC_P (fn_type);
+ }
+
+ if (is_ptrdatamem && TREE_VEC_LENGTH (arg_types) != 1)
+ {
+ if (complain & tf_error)
+ error ("pointer to data member type %qT can only be invoked with "
+ "one argument", fn_type);
+ return error_mark_node;
+ }
+
+ if (is_ptrmemfunc && TREE_VEC_LENGTH (arg_types) == 0)
+ {
+ if (complain & tf_error)
+ error ("pointer to member function type %qT must be invoked with "
+ "at least one argument", fn_type);
+ return error_mark_node;
+ }
+
+ /* Construct an expression of a pointer to member. */
+ tree ptrmem_expr;
+ if (is_ptrdatamem || is_ptrmemfunc)
+ {
+ tree datum_type = TREE_VEC_ELT (arg_types, 0);
+
+ /* datum must be a class type or a reference/pointer to a class type. */
+ if (TYPE_REF_P (datum_type) || POINTER_TYPE_P (datum_type))
+ {
+ if (!CLASS_TYPE_P (TREE_TYPE (datum_type)))
+ {
+ if (complain & tf_error)
+ error ("datum type %qT of a pointer to member must be a class"
I don't see the term "datum" anywhere in [func.require], let's refer to
the "first argument" instead.
+ "type or a reference/pointer to a class type",
+ datum_type);
+ return error_mark_node;
+ }
+ }
+ else if (!CLASS_TYPE_P (datum_type))
+ {
+ if (complain & tf_error)
+ error ("datum type %qT of a pointer to member must be a class"
+ "type or a reference/pointer to a class type",
+ datum_type);
+ return error_mark_node;
+ }
+
+ bool is_refwrap = false;
+ if (CLASS_TYPE_P (datum_type))
+ {
+ /* 1.2 & 1.5: Handle std::reference_wrapper. */
+ tree datum_decl = TYPE_NAME (TYPE_MAIN_VARIANT (datum_type));
+ if (decl_in_std_namespace_p (datum_decl))
+ {
+ const_tree name = DECL_NAME (datum_decl);
+ if (name && (id_equal (name, "reference_wrapper")))
+ {
+ /* Retrieve T from std::reference_wrapper<T>,
+ i.e., decltype(datum.get()). */
+ datum_type = TREE_VEC_ELT (TYPE_TI_ARGS (datum_type), 0);
+ is_refwrap = true;
+ }
+ }
+ }
+
+ tree datum_expr = build_trait_object (datum_type);
+ tree fn_expr = build_trait_object (fn_type);
+ ptrmem_expr = build_m_component_ref (datum_expr, fn_expr, complain);
We should check same-or-base before trying this, not after.
+ if (error_operand_p (ptrmem_expr) && !is_refwrap)
+ {
+ tree ptrmem_class_type = TYPE_PTRMEM_CLASS_TYPE (fn_type);
+ const bool ptrmem_is_base_of_datum =
+ (NON_UNION_CLASS_TYPE_P (ptrmem_class_type)
+ && NON_UNION_CLASS_TYPE_P (datum_type)
+ && (same_type_ignoring_top_level_qualifiers_p (ptrmem_class_type,
+ datum_type)
+ || DERIVED_FROM_P (ptrmem_class_type, datum_type)));
+
+ if (!ptrmem_is_base_of_datum)
+ {
+ /* 1.3 & 1.6: Try to dereference datum_expr. */
+ datum_expr = build_x_indirect_ref (UNKNOWN_LOCATION, datum_expr,
+ RO_UNARY_STAR, NULL_TREE,
+ complain);
+ /* Rebuild ptrmem_expr. */
+ ptrmem_expr = build_m_component_ref (datum_expr, fn_expr,
+ complain);
+ }
+ }
+ /* 1.1 & 1.4: Otherwise. */
+
+ if (error_operand_p (ptrmem_expr))
+ {
+ if (complain & tf_error)
+ error ("cannot form an INVOKE expression of a pointer to member");
if (complain & tf_eror), we should have already given an error, this one
seems redundant.
Jason
+ return error_mark_node;
+ }
