254 lines
7.5 KiB
C
254 lines
7.5 KiB
C
/* Language-dependent hooks for C++.
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Copyright (C) 2001-2020 Free Software Foundation, Inc.
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Contributed by Alexandre Oliva <aoliva@redhat.com>
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "cp-tree.h"
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#include "stor-layout.h"
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#include "langhooks.h"
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#include "langhooks-def.h"
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#include "cp-objcp-common.h"
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enum c_language_kind c_language = clk_cxx;
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static const char * cxx_dwarf_name (tree t, int verbosity);
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static enum classify_record cp_classify_record (tree type);
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static tree cp_eh_personality (void);
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static tree get_template_innermost_arguments_folded (const_tree);
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static tree get_template_argument_pack_elems_folded (const_tree);
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static tree cxx_enum_underlying_base_type (const_tree);
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/* Lang hooks common to C++ and ObjC++ are declared in cp/cp-objcp-common.h;
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consequently, there should be very few hooks below. */
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#undef LANG_HOOKS_NAME
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#define LANG_HOOKS_NAME "GNU C++"
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#undef LANG_HOOKS_INIT
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#define LANG_HOOKS_INIT cxx_init
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#undef LANG_HOOKS_CLASSIFY_RECORD
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#define LANG_HOOKS_CLASSIFY_RECORD cp_classify_record
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#undef LANG_HOOKS_GENERIC_TYPE_P
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#define LANG_HOOKS_GENERIC_TYPE_P class_tmpl_impl_spec_p
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#undef LANG_HOOKS_GET_INNERMOST_GENERIC_PARMS
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#define LANG_HOOKS_GET_INNERMOST_GENERIC_PARMS \
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get_primary_template_innermost_parameters
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#undef LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS
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#define LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS \
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get_template_innermost_arguments_folded
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#undef LANG_HOOKS_FUNCTION_PARAMETER_PACK_P
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#define LANG_HOOKS_FUNCTION_PARAMETER_PACK_P \
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function_parameter_pack_p
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#undef LANG_HOOKS_GET_ARGUMENT_PACK_ELEMS
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#define LANG_HOOKS_GET_ARGUMENT_PACK_ELEMS \
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get_template_argument_pack_elems_folded
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#undef LANG_HOOKS_GENERIC_GENERIC_PARAMETER_DECL_P
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#define LANG_HOOKS_GENERIC_GENERIC_PARAMETER_DECL_P \
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template_template_parameter_p
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#undef LANG_HOOKS_FUNCTION_PARM_EXPANDED_FROM_PACK_P
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#define LANG_HOOKS_FUNCTION_PARM_EXPANDED_FROM_PACK_P \
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function_parameter_expanded_from_pack_p
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#undef LANG_HOOKS_GET_GENERIC_FUNCTION_DECL
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#define LANG_HOOKS_GET_GENERIC_FUNCTION_DECL get_function_template_decl
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#undef LANG_HOOKS_DWARF_NAME
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#define LANG_HOOKS_DWARF_NAME cxx_dwarf_name
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#undef LANG_HOOKS_INIT_TS
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#define LANG_HOOKS_INIT_TS cp_common_init_ts
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#undef LANG_HOOKS_EH_PERSONALITY
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#define LANG_HOOKS_EH_PERSONALITY cp_eh_personality
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#undef LANG_HOOKS_EH_RUNTIME_TYPE
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#define LANG_HOOKS_EH_RUNTIME_TYPE build_eh_type_type
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#undef LANG_HOOKS_ENUM_UNDERLYING_BASE_TYPE
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#define LANG_HOOKS_ENUM_UNDERLYING_BASE_TYPE cxx_enum_underlying_base_type
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#if CHECKING_P
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#undef LANG_HOOKS_RUN_LANG_SELFTESTS
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#define LANG_HOOKS_RUN_LANG_SELFTESTS selftest::run_cp_tests
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#endif /* #if CHECKING_P */
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#undef LANG_HOOKS_GET_SUBSTRING_LOCATION
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#define LANG_HOOKS_GET_SUBSTRING_LOCATION c_get_substring_location
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/* Each front end provides its own lang hook initializer. */
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struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;
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/* Lang hook routines common to C++ and ObjC++ appear in cp/cp-objcp-common.c;
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there should be very few routines below. */
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/* The following function does something real, but only in Objective-C++. */
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tree
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objcp_tsubst_copy_and_build (tree /*t*/,
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tree /*args*/,
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tsubst_flags_t /*complain*/,
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tree /*in_decl*/,
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bool /*function_p*/)
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{
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return NULL_TREE;
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}
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static const char *
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cxx_dwarf_name (tree t, int verbosity)
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{
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gcc_assert (DECL_P (t));
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if (DECL_NAME (t) && IDENTIFIER_ANON_P (DECL_NAME (t)))
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return NULL;
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if (verbosity >= 2)
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return decl_as_dwarf_string (t,
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TFF_DECL_SPECIFIERS | TFF_UNQUALIFIED_NAME
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| TFF_NO_OMIT_DEFAULT_TEMPLATE_ARGUMENTS);
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return lang_decl_dwarf_name (t, verbosity, false);
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}
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static enum classify_record
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cp_classify_record (tree type)
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{
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if (TYPE_LANG_SPECIFIC (type)
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&& CLASSTYPE_DECLARED_CLASS (type))
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return RECORD_IS_CLASS;
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return RECORD_IS_STRUCT;
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}
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static GTY(()) tree cp_eh_personality_decl;
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static tree
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cp_eh_personality (void)
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{
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if (!cp_eh_personality_decl)
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cp_eh_personality_decl = build_personality_function ("gxx");
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return cp_eh_personality_decl;
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}
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/* This is a subroutine of fold_cplus_constants. It returns TRUE if T
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is a C++ specific constant that needs to be folded further before
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being passed to the debug info emitter. */
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static bool
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template_arg_needs_folding (const_tree t)
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{
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/* For now only PTRMEM_CST nodes are to be folded further. */
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if (TREE_CODE (t) == PTRMEM_CST)
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return true;
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return false;
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}
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/* Fold the elements of the TREE_VEC C which are C++ specific nodes
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that would need folding so that they can be processed by the debug
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info emitter. This is a subroutine of
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get_template_innermost_arguments_folded and
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get_template_argument_pack_elems_folded. */
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static tree
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fold_cplus_constants (const_tree c)
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{
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tree folded_elems, elems = CONST_CAST_TREE (c);
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int vec_len, i;
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if (elems == NULL_TREE || elems == error_mark_node)
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return elems;
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vec_len = TREE_VEC_LENGTH (elems);
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/* First check if there is at least one element that needs
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folding. If there is none, we just return ELEMS. Otherwise create
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and return a new tree vector that contains the folded versions of
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ELEMS. This is to avoid allocating memory if we don't need
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to. */
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for (i = 0; i < vec_len; ++i)
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{
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if (template_arg_needs_folding (TREE_VEC_ELT (elems, i)))
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break;
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}
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if (i == vec_len)
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return elems;
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folded_elems = make_tree_vec (vec_len);
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for (i = 0; i < vec_len; ++i)
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{
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tree elem = TREE_VEC_ELT (elems, i);
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TREE_VEC_ELT (folded_elems, i) =
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(elem && !TYPE_P (elem)) ? cplus_expand_constant (elem) : elem;
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}
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return folded_elems;
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}
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/* The C++ implementation of the LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS
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hook. It returns the innermost template arguments of type T, and
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makes sure those arguments are folded enough for the debug info
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emitter. */
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static tree
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get_template_innermost_arguments_folded (const_tree t)
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{
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return fold_cplus_constants (get_template_innermost_arguments (t));
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}
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static tree
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get_template_argument_pack_elems_folded (const_tree t)
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{
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return fold_cplus_constants (get_template_argument_pack_elems (t));
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}
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/* The C++ version of the enum_underlying_base_type langhook.
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See also cp/semantics.c (finish_underlying_type). */
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static
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tree cxx_enum_underlying_base_type (const_tree type)
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{
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tree underlying_type = ENUM_UNDERLYING_TYPE (type);
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if (! ENUM_FIXED_UNDERLYING_TYPE_P (type))
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underlying_type
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= c_common_type_for_mode (TYPE_MODE (underlying_type),
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TYPE_UNSIGNED (underlying_type));
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return underlying_type;
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}
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#if CHECKING_P
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namespace selftest {
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/* Implementation of LANG_HOOKS_RUN_LANG_SELFTESTS for the C++ frontend. */
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void
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run_cp_tests (void)
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{
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/* Run selftests shared within the C family. */
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c_family_tests ();
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/* Additional C++-specific tests. */
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cp_pt_c_tests ();
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cp_tree_c_tests ();
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}
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} // namespace selftest
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#endif /* #if CHECKING_P */
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#include "gt-cp-cp-lang.h"
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#include "gtype-cp.h"
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