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/* Language-dependent hooks for C++.
Copyright (C) 2001-2015 Free Software Foundation, Inc.
Contributed by Alexandre Oliva <aoliva@redhat.com>
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "alias.h"
#include "tree.h"
#include "stor-layout.h"
#include "cp-tree.h"
#include "c-family/c-common.h"
#include "langhooks.h"
#include "langhooks-def.h"
#include "debug.h"
#include "cp-objcp-common.h"
#include "target.h"
#include "parser.h"
enum c_language_kind c_language = clk_cxx;
static void cp_init_ts (void);
static const char * cxx_dwarf_name (tree t, int verbosity);
static enum classify_record cp_classify_record (tree type);
static tree cp_eh_personality (void);
static tree get_template_innermost_arguments_folded (const_tree);
static tree get_template_argument_pack_elems_folded (const_tree);
static tree cxx_enum_underlying_base_type (const_tree);
/* Lang hooks common to C++ and ObjC++ are declared in cp/cp-objcp-common.h;
consequently, there should be very few hooks below. */
#undef LANG_HOOKS_NAME
#define LANG_HOOKS_NAME "GNU C++"
#undef LANG_HOOKS_INIT
#define LANG_HOOKS_INIT cxx_init
#undef LANG_HOOKS_CLASSIFY_RECORD
#define LANG_HOOKS_CLASSIFY_RECORD cp_classify_record
#undef LANG_HOOKS_GENERIC_TYPE_P
#define LANG_HOOKS_GENERIC_TYPE_P class_tmpl_impl_spec_p
#undef LANG_HOOKS_GET_INNERMOST_GENERIC_PARMS
#define LANG_HOOKS_GET_INNERMOST_GENERIC_PARMS \
get_primary_template_innermost_parameters
#undef LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS
#define LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS \
get_template_innermost_arguments_folded
#undef LANG_HOOKS_FUNCTION_PARAMETER_PACK_P
#define LANG_HOOKS_FUNCTION_PARAMETER_PACK_P \
function_parameter_pack_p
#undef LANG_HOOKS_GET_ARGUMENT_PACK_ELEMS
#define LANG_HOOKS_GET_ARGUMENT_PACK_ELEMS \
get_template_argument_pack_elems_folded
#undef LANG_HOOKS_GENERIC_GENERIC_PARAMETER_DECL_P
#define LANG_HOOKS_GENERIC_GENERIC_PARAMETER_DECL_P \
template_template_parameter_p
#undef LANG_HOOKS_FUNCTION_PARM_EXPANDED_FROM_PACK_P
#define LANG_HOOKS_FUNCTION_PARM_EXPANDED_FROM_PACK_P \
function_parameter_expanded_from_pack_p
#undef LANG_HOOKS_GET_GENERIC_FUNCTION_DECL
#define LANG_HOOKS_GET_GENERIC_FUNCTION_DECL get_function_template_decl
#undef LANG_HOOKS_DWARF_NAME
#define LANG_HOOKS_DWARF_NAME cxx_dwarf_name
#undef LANG_HOOKS_INIT_TS
#define LANG_HOOKS_INIT_TS cp_init_ts
#undef LANG_HOOKS_EH_PERSONALITY
#define LANG_HOOKS_EH_PERSONALITY cp_eh_personality
#undef LANG_HOOKS_EH_RUNTIME_TYPE
#define LANG_HOOKS_EH_RUNTIME_TYPE build_eh_type_type
#undef LANG_HOOKS_ENUM_UNDERLYING_BASE_TYPE
#define LANG_HOOKS_ENUM_UNDERLYING_BASE_TYPE cxx_enum_underlying_base_type
/* Each front end provides its own lang hook initializer. */
struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;
/* Lang hook routines common to C++ and ObjC++ appear in cp/cp-objcp-common.c;
there should be very few routines below. */
/* The following function does something real, but only in Objective-C++. */
tree
objcp_tsubst_copy_and_build (tree /*t*/,
tree /*args*/,
tsubst_flags_t /*complain*/,
tree /*in_decl*/,
bool /*function_p*/)
{
return NULL_TREE;
}
static void
cp_init_ts (void)
{
cp_common_init_ts ();
init_shadowed_var_for_decl ();
}
static const char *
cxx_dwarf_name (tree t, int verbosity)
{
gcc_assert (DECL_P (t));
if (DECL_NAME (t)
&& (anon_aggrname_p (DECL_NAME (t)) || LAMBDA_TYPE_P (t)))
return NULL;
if (verbosity >= 2)
return decl_as_dwarf_string (t,
TFF_DECL_SPECIFIERS | TFF_UNQUALIFIED_NAME
| TFF_NO_OMIT_DEFAULT_TEMPLATE_ARGUMENTS);
return lang_decl_dwarf_name (t, verbosity, false);
}
static enum classify_record
cp_classify_record (tree type)
{
if (TYPE_LANG_SPECIFIC (type)
&& CLASSTYPE_DECLARED_CLASS (type))
return RECORD_IS_CLASS;
return RECORD_IS_STRUCT;
}
static GTY(()) tree cp_eh_personality_decl;
static tree
cp_eh_personality (void)
{
if (!cp_eh_personality_decl)
{
const char *lang = (pragma_java_exceptions ? "gcj" : "gxx");
cp_eh_personality_decl = build_personality_function (lang);
}
return cp_eh_personality_decl;
}
/* This is a subroutine of fold_cplus_constants. It returns TRUE if T
is a C++ specific constant that needs to be folded further before
being passed to the debug info emitter. */
static bool
template_arg_needs_folding (const_tree t)
{
/* For now only PTRMEM_CST nodes are to be folded further. */
if (TREE_CODE (t) == PTRMEM_CST)
return true;
return false;
}
/* Fold the elements of the TREE_VEC C which are C++ specific nodes
that would need folding so that they can be processed by the debug
info emitter. This is a subroutine of
get_template_innermost_arguments_folded and
get_template_argument_pack_elems_folded. */
static tree
fold_cplus_constants (const_tree c)
{
tree folded_elems, elems = CONST_CAST_TREE (c);
int vec_len, i;
if (elems == NULL_TREE || elems == error_mark_node)
return elems;
vec_len = TREE_VEC_LENGTH (elems);
/* First check if there is at least one element that needs
folding. If there is none, we just return ELEMS. Otherwise create
and return a new tree vector that contains the folded versions of
ELEMS. This is to avoid allocating memory if we don't need
to. */
for (i = 0; i < vec_len; ++i)
{
if (template_arg_needs_folding (TREE_VEC_ELT (elems, i)))
break;
}
if (i == vec_len)
return elems;
folded_elems = make_tree_vec (vec_len);
for (i = 0; i < vec_len; ++i)
{
tree elem = TREE_VEC_ELT (elems, i);
TREE_VEC_ELT (folded_elems, i) =
(elem && !TYPE_P (elem)) ? cplus_expand_constant (elem) : elem;
}
return folded_elems;
}
/* The C++ implementation of the LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS
hook. It returns the innermost template arguments of type T, and
makes sure those arguments are folded enough for the debug info
emitter. */
static tree
get_template_innermost_arguments_folded (const_tree t)
{
return fold_cplus_constants (get_template_innermost_arguments (t));
}
static tree
get_template_argument_pack_elems_folded (const_tree t)
{
return fold_cplus_constants (get_template_argument_pack_elems (t));
}
/* The C++ version of the enum_underlying_base_type langhook.
See also cp/semantics.c (finish_underlying_type). */
static
tree cxx_enum_underlying_base_type (const_tree type)
{
tree underlying_type = ENUM_UNDERLYING_TYPE (type);
if (! ENUM_FIXED_UNDERLYING_TYPE_P (type))
underlying_type
= c_common_type_for_mode (TYPE_MODE (underlying_type),
TYPE_UNSIGNED (underlying_type));
return underlying_type;
}
#include "gt-cp-cp-lang.h"
#include "gtype-cp.h"
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