5d80a30674
2007-03-09 Douglas Gregor <doug.gregor@gmail.com> PR c++/20599 * typeck.c (check_return_expr): Check for bare parameter packs. (comptypes): Compare template parameter packs and type pack expansions. * decl.c (grokdeclarator): Deal with the declaration of function parameter packs. (grokparms): Verify that the (optional) function parameter pack is at the end of the parameter list. (xref_basetypes): Handle pack expansions in the base class. (cp_tree_node_structure): Handle ARGUMENT_PACK_SELECT. * cp-tree.def (TYPE_ARGUMENT_PACK): New. (NONTYPE_ARGUMENT_PACK): New. (TYPE_PACK_EXPANSION): New. (EXPR_PACK_EXPANSION): New. (ARGUMENT_PACK_SELECT): New. * cp-objcp-common.c (cp_tree_size): Compute size of (NON)TYPE_ARGUMENT_PACK, (TYPE|EXPR)_PACK_EXPANSION, and ARGUMENT_PACK_SELECT. * error.c (dump_template_argument): Print template argument packs. (dump_template_argument_list): Ditto. (dump_template_parameter): Dump `...' for template type parameter packs. (dump_type): Dump TYPE_PACK_EXPANSION nodes. (dump_parameters): Print function parameter packs. (dump_template_parms): Print template argument packs. (dump_expr): Dump EXPR_PACK_EXPANSION nodes. (maybe_warn_variadic_templates): New. * operators.def: Add ellipsis operator for EXPR_PACK_EXPANSION. * tree.c (cp_walk_subtrees): Walk BASELINK, TYPE_ARGUMENT_PACK, NONTYPE_ARGUMENT_PACK, TYPE_PACK_EXPANSION, EXPR_PACK_EXPANSION, CAST_EXPR. * mangle.c (write_type): Mangle TYPE_PACK_EXPANSION. (write_template_arg): Write argument packs as separate arguments. * cp-tree.h (struct template_parm_index_s): Add flag that indicates that the template parameter is actually a parameter pack. (struct tree_argument_pack_select): New. (enum cp_tree_node_structure_enum): Add TS_CP_ARGUMENT_PACK_SELECT. (union lang_tree_node): Add argument_pack_select. (FUNCTION_PARAMETER_PACK_P): New. (PACK_EXPANSION_P): New. (PACK_EXPANSION_PATTERN): New. (SET_PACK_EXPANSION_PATTERN): New. (PACK_EXPANSION_PARAMETER_PACKS): New. (ARGUMENT_PACK_P): New. (ARGUMENT_PACK_ARGS): New. (SET_ARGUMENT_PACK_ARGS): New. (ARGUMENT_PACK_INCOMPLETE_P): New. (ARGUMENT_PACK_EXPLICIT_ARGS): New. (TEMPLATE_PARM_PARAMETER_PACK): New. (TEMPLATE_TYPE_PARAMETER_PACK): New. (ARGUMENT_PACK_SELECT_FROM_PACK): New. (ARGUMENT_PACK_SELECT_INDEX): New. (ARGUMENT_PACK_SELECT_ARG): New. (struct cp_declarator): Add parameter_pack_p flag. (maybe_warn_variadic_templates): Declare. (process_template_parm): Add bool parameter IS_PARAMETER_PACK, to indicate a template parameter pack. (uses_parameter_packs): Declare. (template_parameter_pack_p): Declare. (template_parms_variadic_p): Declare. (make_pack_expansion): Declare. (check_for_bare_parameter_packs): Declare. * cxx-pretty-print.c (pp_cxx_unary_expression): Print sizeof... expressions. (pp_cxx_expression): Print pack expansions and non-type argument packs. (pp_cxx_exception_specification): Print pack expansions. (pp_cxx_direct_declarator): Print ellipsis for parameter packs. (pp_cxx_ctor_initializer): Print pack expansions. (pp_cxx_type_id): Print pack expansions. (pp_cxx_template_argument_list): Print argument packs. (pp_cxx_template_parameter): Print ellipsis for template parameter packs. * pt.c (comp_template_parms): Compare template parameter packs. (template_parameter_pack_p): New. (template_parms_variadic_p): New. (template_args_variadic_p): New. (make_ith_pack_parameter_name): New. (struct find_parameter_pack_data): New. (find_parameter_packs_r): New. (uses_parameter_packs): New. (make_pack_expansion): New. (check_for_bare_parameter_packs): New. (expand_template_argument_pack): New. (reduce_template_parm_level): Propagate parameter pack flag. (process_template_parm): Add is_parameter_pack parameter to state when the parameter is actually a parameter pack. Create template parameter packs when is_parameter_pack is true. (current_template_args): The argument for a template parameter pack is an argument pack containing a single pack expansion. (process_partial_specialization): When checking that non-type argument expressions do not involve template parameters, loop over the arguments in argument packs separately. (push_template_decl_real): Check that the type of the declaration does not have any bare parameter packs. Check that primary templates have no more than one parameter pack, and that it comes at the end of the template parameter list. (convert_template_argument): Handle coercions for pack expansion expressions by coercing the pattern then rebuilding the expansion. (coerce_template_parms): When coercing the arguments for a variadic template, pack "extra" arguments into an argument pack. (coerce_template_template_parms): Cannot coerce between parameter packs and non-pack parameters. (template_args_equal): Compare PACK_EXPANSION_P expressions. (comp_template_args): Expand all template arguments packs before comparing template argument lists. (mangle_class_name_for_template): Make argument packs as separate template arguments. (for_each_template_parm_r): No need to handle BASELINK. (instantiate_class_template): Handle pack expansions in the base class list. (tsubst_pack_expansion): New. (tsubst_template_args): Handle substitutions of argument packs and pack expansion into template argument lists. (tsubst_decl): Expand function parameter packs into separate function parameters. (tsubst_arg_types): Expand a type pack expansion into separate argument types. (tsubst_exception_specification): Handle pack expansions in exception specifiers. (tsubst): See through ARGUMENT_PACK_SELECT arguments when replacing a template parameter with its argument. If we encounter a substitution for an argument pack, just return the parameter itself. (tsubst_copy): sizeof(X...) returns the number of elements in parameter pack X. See through ARGUMENT_PACK_SELECT when the PARM_DECL is a parameter pack. (tsubst_expr): Expression pack expansions and argument packs cannot show up here; they will all be handled through function calls, sizeof, and template argument lists. (tsubst_copy_and_build): sizeof(X...) returns the number of elements in parameter pack X. Handle pack expansions in TREE_LIST and CONSTRUCTOR nodes. (fn_type_unification): Handle "incomplete" explicit template argument lists that specify some of the arguments for a template parameter pack. (type_unification_real): Unify arguments against pack expansions. (template_parm_level_and_index): New, helper function. (unify_pack_expansion): New. (unify): Unify argument packs on an argument-by-argument basis, handling variadic argument packs as well. (more_specialized_fn): Handle unification of function parameter packs. All things being equal, prefer non-variadic function templates to variadic function templates. (more_specialized_class): Prefer the variadic class template partial specialization that binds fewer arguments to a parameter pack. (regenerate_decl_from_template): Expand function parameter packs into separate parameters. (instantiate_decl): Ditto. (tsubst_initializer_list): Handle pack expansions for base-class initializers. (dependent_type_p_r): Determine dependent types in argument packs and pack expansions. (value_dependent_expression_p): Determine value-dependence of non-type argument packs. (dependent_template_arg_p): Handle argument packs. * semantics.c (finish_cond): Check for bare parameter packs. (finish_expr_stmt): Ditto. (finish_for_expr): Ditto. (finish_switch_cond): Ditto. (finish_mem_initializers): Ditto. * name-lookup.c (arg_assoc_type): Handle pack expansions and argument packs. * decl2.c (cp_build_parm_decl): Mark function parameter packs. * parser.c (make_declarator): Declarator is not an expansion. (make_pointer_declarator): Transfer parameter pack flag to outer declarator. (make_reference_declarator): Ditto. (make_ptrmem_declarator): Ditto. (make_call_declarator): Ditto. (make_array_declarator): Ditto. (cp_parser_postfix_expression): Allow pack expansion expressions in the argument list for a call expression. (cp_parser_parenthesized_expression_list): Add new parameter ALLOW_EXPANSION_P. When true, parse the ellipsis to mean "expand into separate arguments." (cp_parser_new_placement): Allow pack expansion expressions. (cp_parser_new_initializer): Ditto. (cp_parser_mem_initializer_list): Allow ellipsis to create a base-class initializer expansion. (cp_parser_mem_initializer): Ditto. (cp_parser_template_parameter_list): Keep track of whether the template parameter is a template parameter pack. (cp_parser_template_parameter): Parse the ellipsis to indicate a template parameter pack. (cp_parser_type_parameter): Ditto. (cp_parser_template_argument_list): Parse the ellipsis to indicate a pack expansion. (cp_parser_direct_declarator): Parse the ellipsis to indicate that this declarator is a parameter pack. (cp_parser_parameter_declaration): The ellipsis does not end the parameter declaration, because it might be a parameter pack. Parse the ellipsis to indicate a parameter pack. (cp_parser_initializer): Allow pack expansions. (cp_parser_initializer_list): Allow ellipsis to create an initializer expansion. (cp_parser_base_clause): Allow ellipsis to create a base specifier expansion. (cp_parser_type_id_list): Allow ellipsis to create an exception specifier expansion. (cp_parser_attribute_list): Don't allow pack expansions. (cp_parser_functional_cast): Allow pack expansions. (cp_parser_sizeof_operand): Allow ellipsis following "sizeof" to compute the length of a parameter pack. (cp_parser_next_token_ends_template_argument_p): An ellipsis can end a template argument. * tree.c (cp_walk_subtrees): Walk BASELINK, TYPE_ARGUMENT_PACK, NONTYPE_ARGUMENT_PACK, TYPE_PACK_EXPANSION, EXPR_PACK_EXPANSION, CAST_EXPR. From-SVN: r122788 |
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