PR c++/58407 - deprecated implicit copy ops.
gcc/c-family/ * c.opt (Wdeprecated-copy): New flag. gcc/cp/ * call.c (build_over_call): Warn about deprecated trivial fns. * class.c (classtype_has_user_copy_or_dtor): New. (type_build_ctor_call): Check TREE_DEPRECATED. (type_build_dtor_call): Likewise. * decl2.c (cp_warn_deprecated_use): Move from tree.c. Add checks. Return bool. Handle -Wdeprecated-copy. (mark_used): Use it. * decl.c (grokdeclarator): Remove redundant checks. * typeck2.c (build_functional_cast): Likewise. * method.c (lazily_declare_fn): Mark deprecated copy ops. * init.c (build_aggr_init): Only set TREE_USED if there are side-effects. libitm/ * beginend.cc (save): Disable -Werror=deprecated-copy. From-SVN: r260381
This commit is contained in:
Jason Merrill
Jason Merrill
parent
f07c223768
commit
b46b715d5b
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@ -1,3 +1,7 @@
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2018-05-18 Jason Merrill <jason@redhat.com>
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* c.opt (Wdeprecated-copy): New flag.
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2018-05-17 Martin Liska <mliska@suse.cz>
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* c-warn.c (overflow_warning): Do not use
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@ -464,6 +464,11 @@ Wdeprecated
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C C++ ObjC ObjC++ CPP(cpp_warn_deprecated) CppReason(CPP_W_DEPRECATED) Var(warn_deprecated) Init(1) Warning
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Warn if a deprecated compiler feature, class, method, or field is used.
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Wdeprecated-copy
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C++ ObjC++ Var(warn_deprecated_copy) Warning LangEnabledBy(C++ ObjC++, Wall)
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Mark implicitly-declared copy operations as deprecated if the class has a
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user-provided copy operation or destructor.
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Wdesignated-init
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C ObjC Var(warn_designated_init) Init(1) Warning
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Warn about positional initialization of structs requiring designated initializers.
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@ -1,3 +1,19 @@
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2018-05-18 Jason Merrill <jason@redhat.com>
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PR c++/58407 - deprecated implicit copy ops.
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* call.c (build_over_call): Warn about deprecated trivial fns.
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* class.c (classtype_has_user_copy_or_dtor): New.
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(type_build_ctor_call): Check TREE_DEPRECATED.
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(type_build_dtor_call): Likewise.
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* decl2.c (cp_warn_deprecated_use): Move from tree.c.
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Add checks. Return bool. Handle -Wdeprecated-copy.
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(mark_used): Use it.
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* decl.c (grokdeclarator): Remove redundant checks.
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* typeck2.c (build_functional_cast): Likewise.
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* method.c (lazily_declare_fn): Mark deprecated copy ops.
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* init.c (build_aggr_init): Only set TREE_USED if there are
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side-effects.
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2018-05-18 Cesar Philippidis <cesar@codesourcery.com>
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PR c++/85782
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@ -8168,21 +8168,30 @@ build_over_call (struct z_candidate *cand, int flags, tsubst_flags_t complain)
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/* See unsafe_copy_elision_p. */
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|| DECL_BASE_CONSTRUCTOR_P (fn));
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/* [class.copy]: the copy constructor is implicitly defined even if
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the implementation elided its use. */
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if (!trivial && !force_elide)
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fa = argarray[0];
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bool unsafe = unsafe_copy_elision_p (fa, arg);
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bool eliding_temp = (TREE_CODE (arg) == TARGET_EXPR && !unsafe);
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/* [class.copy]: the copy constructor is implicitly defined even if the
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implementation elided its use. But don't warn about deprecation when
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eliding a temporary, as then no copy is actually performed. */
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warning_sentinel s (warn_deprecated_copy, eliding_temp);
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if (force_elide)
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/* The language says this isn't called. */;
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else if (!trivial)
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{
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if (!mark_used (fn, complain) && !(complain & tf_error))
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return error_mark_node;
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already_used = true;
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}
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else
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cp_warn_deprecated_use (fn, complain);
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/* If we're creating a temp and we already have one, don't create a
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new one. If we're not creating a temp but we get one, use
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INIT_EXPR to collapse the temp into our target. Otherwise, if the
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ctor is trivial, do a bitwise copy with a simple TARGET_EXPR for a
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temp or an INIT_EXPR otherwise. */
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fa = argarray[0];
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if (is_dummy_object (fa))
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{
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if (TREE_CODE (arg) == TARGET_EXPR)
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@ -8191,7 +8200,7 @@ build_over_call (struct z_candidate *cand, int flags, tsubst_flags_t complain)
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return force_target_expr (DECL_CONTEXT (fn), arg, complain);
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}
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else if ((trivial || TREE_CODE (arg) == TARGET_EXPR)
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&& !unsafe_copy_elision_p (fa, arg))
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&& !unsafe)
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{
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tree to = cp_stabilize_reference (cp_build_fold_indirect_ref (fa));
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@ -8241,6 +8250,8 @@ build_over_call (struct z_candidate *cand, int flags, tsubst_flags_t complain)
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TREE_NO_WARNING (val) = 1;
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}
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cp_warn_deprecated_use (fn, complain);
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return val;
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}
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else if (trivial_fn_p (fn))
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@ -5171,6 +5171,40 @@ classtype_has_move_assign_or_move_ctor_p (tree t, bool user_p)
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return false;
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}
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/* If T, a class, has a user-provided copy constructor, copy assignment
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operator, or destructor, returns that function. Otherwise, null. */
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tree
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classtype_has_user_copy_or_dtor (tree t)
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{
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if (!CLASSTYPE_LAZY_COPY_CTOR (t))
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for (ovl_iterator iter (CLASSTYPE_CONSTRUCTORS (t)); iter; ++iter)
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{
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tree fn = *iter;
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if (user_provided_p (fn) && copy_fn_p (fn))
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return fn;
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}
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if (!CLASSTYPE_LAZY_COPY_ASSIGN (t))
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for (ovl_iterator iter (get_class_binding_direct
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(t, assign_op_identifier));
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iter; ++iter)
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{
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tree fn = *iter;
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if (user_provided_p (fn) && copy_fn_p (fn))
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return fn;
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}
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if (!CLASSTYPE_LAZY_DESTRUCTOR (t))
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{
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tree fn = CLASSTYPE_DESTRUCTOR (t);
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if (user_provided_p (fn))
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return fn;
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}
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return NULL_TREE;
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}
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/* Nonzero if we need to build up a constructor call when initializing an
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object of this class, either because it has a user-declared constructor
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or because it doesn't have a default constructor (so we need to give an
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@ -5201,6 +5235,7 @@ type_build_ctor_call (tree t)
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{
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tree fn = *iter;
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if (!DECL_ARTIFICIAL (fn)
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|| TREE_DEPRECATED (fn)
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|| DECL_DELETED_FN (fn))
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return true;
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}
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@ -5228,6 +5263,7 @@ type_build_dtor_call (tree t)
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{
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tree fn = *iter;
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if (!DECL_ARTIFICIAL (fn)
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|| TREE_DEPRECATED (fn)
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|| DECL_DELETED_FN (fn))
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return true;
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}
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@ -6103,6 +6103,7 @@ extern bool is_std_init_list (tree);
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extern bool is_list_ctor (tree);
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extern void validate_conversion_obstack (void);
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extern void mark_versions_used (tree);
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extern bool cp_warn_deprecated_use (tree, tsubst_flags_t = tf_warning_or_error);
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extern tree get_function_version_dispatcher (tree);
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/* in class.c */
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@ -6164,6 +6165,7 @@ extern bool trivial_default_constructor_is_constexpr (tree);
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extern bool type_has_constexpr_default_constructor (tree);
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extern bool type_has_virtual_destructor (tree);
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extern bool classtype_has_move_assign_or_move_ctor_p (tree, bool user_declared);
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extern tree classtype_has_user_copy_or_dtor (tree);
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extern bool type_build_ctor_call (tree);
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extern bool type_build_dtor_call (tree);
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extern void explain_non_literal_class (tree);
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@ -7157,7 +7159,6 @@ extern tree cxx_copy_lang_qualifiers (const_tree, const_tree);
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extern void cxx_print_statistics (void);
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extern bool maybe_warn_zero_as_null_pointer_constant (tree, location_t);
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extern void cp_warn_deprecated_use (tree);
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/* in ptree.c */
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extern void cxx_print_xnode (FILE *, tree, int);
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@ -10388,18 +10388,12 @@ grokdeclarator (const cp_declarator *declarator,
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type = NULL_TREE;
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type_was_error_mark_node = true;
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}
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/* If the entire declaration is itself tagged as deprecated then
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suppress reports of deprecated items. */
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if (type && TREE_DEPRECATED (type)
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&& deprecated_state != DEPRECATED_SUPPRESS)
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cp_warn_deprecated_use (type);
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cp_warn_deprecated_use (type);
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if (type && TREE_CODE (type) == TYPE_DECL)
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{
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typedef_decl = type;
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type = TREE_TYPE (typedef_decl);
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if (TREE_DEPRECATED (type)
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&& DECL_ARTIFICIAL (typedef_decl)
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&& deprecated_state != DEPRECATED_SUPPRESS)
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if (DECL_ARTIFICIAL (typedef_decl))
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cp_warn_deprecated_use (type);
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}
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/* No type at all: default to `int', and set DEFAULTED_INT
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@ -5173,6 +5173,55 @@ maybe_instantiate_decl (tree decl)
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}
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}
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/* Maybe warn if DECL is deprecated, subject to COMPLAIN. Returns whether or
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not a warning was emitted. */
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bool
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cp_warn_deprecated_use (tree decl, tsubst_flags_t complain)
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{
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if (!(complain & tf_warning) || !decl
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|| deprecated_state == DEPRECATED_SUPPRESS)
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return false;
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if (!TREE_DEPRECATED (decl))
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{
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/* Perhaps this is a deprecated typedef. */
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if (TYPE_P (decl) && TYPE_NAME (decl))
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decl = TYPE_NAME (decl);
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if (!TREE_DEPRECATED (decl))
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return false;
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}
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/* Don't warn within members of a deprecated type. */
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if (TYPE_P (decl)
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&& currently_open_class (decl))
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return false;
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bool warned = false;
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if (cxx_dialect >= cxx11
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&& DECL_P (decl)
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&& DECL_ARTIFICIAL (decl)
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&& DECL_NONSTATIC_MEMBER_FUNCTION_P (decl)
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&& copy_fn_p (decl))
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{
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warned = warning (OPT_Wdeprecated_copy,
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"implicitly-declared %qD is deprecated", decl);
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if (warned)
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{
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tree ctx = DECL_CONTEXT (decl);
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tree other = classtype_has_user_copy_or_dtor (ctx);
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inform (DECL_SOURCE_LOCATION (other),
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"because %qT has user-provided %qD",
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ctx, other);
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}
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}
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else
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warned = warn_deprecated_use (decl, NULL_TREE);
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return warned;
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}
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/* Mark DECL (either a _DECL or a BASELINK) as "used" in the program.
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If DECL is a specialization or implicitly declared class member,
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generate the actual definition. Return false if something goes
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@ -5237,9 +5286,7 @@ mark_used (tree decl, tsubst_flags_t complain)
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return false;
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}
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if (TREE_DEPRECATED (decl) && (complain & tf_warning)
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&& deprecated_state != DEPRECATED_SUPPRESS)
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warn_deprecated_use (decl, NULL_TREE);
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cp_warn_deprecated_use (decl, complain);
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/* We can only check DECL_ODR_USED on variables or functions with
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DECL_LANG_SPECIFIC set, and these are also the only decls that we
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@ -1733,11 +1733,6 @@ build_aggr_init (tree exp, tree init, int flags, tsubst_flags_t complain)
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&& !DIRECT_LIST_INIT_P (init))
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flags |= LOOKUP_ONLYCONVERTING;
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if ((VAR_P (exp) || TREE_CODE (exp) == PARM_DECL)
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&& !lookup_attribute ("warn_unused", TYPE_ATTRIBUTES (type)))
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/* Just know that we've seen something for this node. */
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TREE_USED (exp) = 1;
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is_global = begin_init_stmts (&stmt_expr, &compound_stmt);
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destroy_temps = stmts_are_full_exprs_p ();
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current_stmt_tree ()->stmts_are_full_exprs_p = 0;
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@ -1748,6 +1743,12 @@ build_aggr_init (tree exp, tree init, int flags, tsubst_flags_t complain)
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TREE_READONLY (exp) = was_const;
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TREE_THIS_VOLATILE (exp) = was_volatile;
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if ((VAR_P (exp) || TREE_CODE (exp) == PARM_DECL)
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&& TREE_SIDE_EFFECTS (stmt_expr)
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&& !lookup_attribute ("warn_unused", TYPE_ATTRIBUTES (type)))
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/* Just know that we've seen something for this node. */
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TREE_USED (exp) = 1;
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return stmt_expr;
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}
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@ -2394,8 +2394,19 @@ lazily_declare_fn (special_function_kind sfk, tree type)
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move assignment operator, the implicitly declared copy constructor is
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defined as deleted.... */
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if ((sfk == sfk_copy_assignment || sfk == sfk_copy_constructor)
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&& classtype_has_move_assign_or_move_ctor_p (type, true))
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DECL_DELETED_FN (fn) = true;
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&& cxx_dialect >= cxx11)
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{
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if (classtype_has_move_assign_or_move_ctor_p (type, true))
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DECL_DELETED_FN (fn) = true;
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else if (classtype_has_user_copy_or_dtor (type))
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/* The implicit definition of a copy constructor as defaulted is
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deprecated if the class has a user-declared copy assignment operator
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or a user-declared destructor. The implicit definition of a copy
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assignment operator as defaulted is deprecated if the class has a
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user-declared copy constructor or a user-declared destructor (15.4,
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15.8). */
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TREE_DEPRECATED (fn) = true;
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}
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/* Destructors and assignment operators may be virtual. */
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if (sfk == sfk_destructor
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@ -5398,19 +5398,6 @@ cp_tree_code_length (enum tree_code code)
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}
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}
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/* Wrapper around warn_deprecated_use that doesn't warn for
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current_class_type. */
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void
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cp_warn_deprecated_use (tree node)
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{
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if (TYPE_P (node)
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&& current_class_type
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&& TYPE_MAIN_VARIANT (node) == current_class_type)
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return;
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warn_deprecated_use (node, NULL_TREE);
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}
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/* Implement -Wzero_as_null_pointer_constant. Return true if the
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conditions for the warning hold, false otherwise. */
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bool
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@ -2064,9 +2064,7 @@ build_functional_cast (tree exp, tree parms, tsubst_flags_t complain)
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{
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type = TREE_TYPE (exp);
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if (complain & tf_warning
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&& TREE_DEPRECATED (type)
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&& DECL_ARTIFICIAL (exp))
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if (DECL_ARTIFICIAL (exp))
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cp_warn_deprecated_use (type);
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}
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else
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@ -213,7 +213,8 @@ in the following sections.
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-fvisibility-ms-compat @gol
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-fext-numeric-literals @gol
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-Wabi=@var{n} -Wabi-tag -Wconversion-null -Wctor-dtor-privacy @gol
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-Wdelete-non-virtual-dtor -Wliteral-suffix -Wmultiple-inheritance @gol
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-Wdelete-non-virtual-dtor -Wdeprecated-copy -Wliteral-suffix @gol
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-Wmultiple-inheritance @gol
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-Wnamespaces -Wnarrowing @gol
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-Wnoexcept -Wnoexcept-type -Wclass-memaccess @gol
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-Wnon-virtual-dtor -Wreorder -Wregister @gol
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@ -2900,6 +2901,14 @@ an instance of a derived class through a pointer to a base class if the
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base class does not have a virtual destructor. This warning is enabled
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by @option{-Wall}.
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@item -Wdeprecated-copy @r{(C++ and Objective-C++ only)}
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@opindex Wdeprecated-copy
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@opindex Wno-deprecated-copy
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Warn that the implicit declaration of a copy constructor or copy
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assignment operator is deprecated if the class has a user-provided
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copy constructor, copy assignment operator, or destructor, in C++11
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and up. This warning is enabled by @option{-Wall}.
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@item -Wliteral-suffix @r{(C++ and Objective-C++ only)}
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@opindex Wliteral-suffix
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@opindex Wno-literal-suffix
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|
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@ -0,0 +1,29 @@
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/* [depr.impldec] The implicit definition of a copy constructor as defaulted is
|
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deprecated if the class has a user-declared copy assignment operator or a
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user-declared destructor. The implicit definition of a copy assignment
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operator as defaulted is deprecated if the class has a user-declared copy
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constructor or a user-declared destructor (15.4, 15.8). In a future revision
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of this International Standard, these implicit definitions could become
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deleted (11.4). */
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// { dg-additional-options -Wdeprecated-copy }
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struct X
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{
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X();
|
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X(const X&);
|
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};
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struct A
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||||
{
|
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X x;
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~A();
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};
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|
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void f(bool b)
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{
|
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A a;
|
||||
if (b)
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throw A(); // Don't warn about elided copy
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A a2 = A(); // Here either.
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A a3 (a); // { dg-warning "deprecated" "" { target c++11 } }
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}
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@ -1,5 +1,5 @@
|
|||
// { dg-do assemble }
|
||||
// { dg-options "-W -Wall" }
|
||||
// { dg-options "-W -Wall -Wno-deprecated-copy" }
|
||||
|
||||
// Copyright (C) 2001 Free Software Foundation, Inc.
|
||||
// Contributed by Nathan Sidwell 2 Mar 2001 <nathan@codesourcery.com>
|
||||
|
|
|
|||
|
|
@ -1,3 +1,7 @@
|
|||
2018-05-17 Jason Merrill <jason@redhat.com>
|
||||
|
||||
* beginend.cc (save): Disable -Werror=deprecated-copy.
|
||||
|
||||
2018-05-02 Tom de Vries <tom@codesourcery.com>
|
||||
|
||||
PR testsuite/85106
|
||||
|
|
|
|||
|
|
@ -431,7 +431,12 @@ GTM::gtm_transaction_cp::save(gtm_thread* tx)
|
|||
// Save everything that we might have to restore on restarts or aborts.
|
||||
jb = tx->jb;
|
||||
undolog_size = tx->undolog.size();
|
||||
|
||||
/* FIXME! Assignment of an aatree like alloc_actions is unsafe; if either
|
||||
*this or *tx is destroyed, the other ends up pointing to a freed node. */
|
||||
#pragma GCC diagnostic warning "-Wdeprecated-copy"
|
||||
alloc_actions = tx->alloc_actions;
|
||||
|
||||
user_actions_size = tx->user_actions.size();
|
||||
id = tx->id;
|
||||
prop = tx->prop;
|
||||
|
|
|
|||
Loading…
Reference in New Issue