gcc/cp/cp-lang.c

   1 /* Language-dependent hooks for C++.
   2    Copyright 2001, 2002, 2004, 2007, 2008, 2009, 2010
   3    Free Software Foundation, Inc.
   4    Contributed by Alexandre Oliva  <aoliva@redhat.com>
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 3, or (at your option)
  11 any later version.
  12
  13 GCC is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "tm.h"
  26 #include "tree.h"
  27 #include "cp-tree.h"
  28 #include "c-family/c-common.h"
  29 #include "langhooks.h"
  30 #include "langhooks-def.h"
  31 #include "debug.h"
  32 #include "cp-objcp-common.h"
  33 #include "hashtab.h"
  34 #include "target.h"
  35 #include "parser.h"
  36 #include "pph.h"
  37
  38 enum c_language_kind c_language = clk_cxx;
  39 static void cp_init_ts (void);
  40 static const char * cxx_dwarf_name (tree t, int verbosity);
  41 static enum classify_record cp_classify_record (tree type);
  42 static tree cp_eh_personality (void);
  43 static tree get_template_innermost_arguments_folded (const_tree);
  44 static tree get_template_argument_pack_elems_folded (const_tree);
  45
  46 /* Lang hooks common to C++ and ObjC++ are declared in cp/cp-objcp-common.h;
  47    consequently, there should be very few hooks below.  */
  48
  49 #undef LANG_HOOKS_NAME
  50 #define LANG_HOOKS_NAME "GNU C++"
  51 #undef LANG_HOOKS_INIT
  52 #define LANG_HOOKS_INIT cxx_init
  53 #undef LANG_HOOKS_CLASSIFY_RECORD
  54 #define LANG_HOOKS_CLASSIFY_RECORD cp_classify_record
  55 #undef LANG_HOOKS_GENERIC_TYPE_P
  56 #define LANG_HOOKS_GENERIC_TYPE_P class_tmpl_impl_spec_p
  57
  58 #undef LANG_HOOKS_GET_INNERMOST_GENERIC_PARMS
  59 #define LANG_HOOKS_GET_INNERMOST_GENERIC_PARMS \
  60         get_primary_template_innermost_parameters
  61 #undef LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS
  62 #define LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS \
  63         get_template_innermost_arguments_folded
  64 #undef LANG_HOOKS_FUNCTION_PARAMETER_PACK_P
  65 #define LANG_HOOKS_FUNCTION_PARAMETER_PACK_P \
  66         function_parameter_pack_p
  67 #undef LANG_HOOKS_GET_ARGUMENT_PACK_ELEMS
  68 #define LANG_HOOKS_GET_ARGUMENT_PACK_ELEMS \
  69         get_template_argument_pack_elems_folded
  70 #undef LANG_HOOKS_GENERIC_GENERIC_PARAMETER_DECL_P
  71 #define LANG_HOOKS_GENERIC_GENERIC_PARAMETER_DECL_P \
  72         template_template_parameter_p
  73 #undef LANG_HOOKS_FUNCTION_PARM_EXPANDED_FROM_PACK_P
  74 #define LANG_HOOKS_FUNCTION_PARM_EXPANDED_FROM_PACK_P \
  75         function_parameter_expanded_from_pack_p
  76 #undef LANG_HOOKS_GET_GENERIC_FUNCTION_DECL
  77 #define LANG_HOOKS_GET_GENERIC_FUNCTION_DECL get_function_template_decl
  78 #undef LANG_HOOKS_DWARF_NAME
  79 #define LANG_HOOKS_DWARF_NAME cxx_dwarf_name
  80 #undef LANG_HOOKS_INIT_TS
  81 #define LANG_HOOKS_INIT_TS cp_init_ts
  82 #undef LANG_HOOKS_EH_PERSONALITY
  83 #define LANG_HOOKS_EH_PERSONALITY cp_eh_personality
  84 #undef LANG_HOOKS_EH_RUNTIME_TYPE
  85 #define LANG_HOOKS_EH_RUNTIME_TYPE build_eh_type_type
  86
  87 /* Each front end provides its own lang hook initializer.  */
  88 struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;
  89
  90 /* Lang hook routines common to C++ and ObjC++ appear in cp/cp-objcp-common.c;
  91    there should be very few routines below.  */
  92
  93 /* The following function does something real, but only in Objective-C++.  */
  94
  95 tree
  96 objcp_tsubst_copy_and_build (tree t ATTRIBUTE_UNUSED,
  97                              tree args ATTRIBUTE_UNUSED,
  98                              tsubst_flags_t complain ATTRIBUTE_UNUSED,
  99                              tree in_decl ATTRIBUTE_UNUSED,
 100                              bool function_p ATTRIBUTE_UNUSED)
 101 {
 102   return NULL_TREE;
 103 }
 104
 105 static void
 106 cp_init_ts (void)
 107 {
 108   cp_common_init_ts ();
 109
 110   init_shadowed_var_for_decl ();
 111 }
 112
 113 static const char *
 114 cxx_dwarf_name (tree t, int verbosity)
 115 {
 116   gcc_assert (DECL_P (t));
 117
 118   if (DECL_NAME (t)
 119       && (ANON_AGGRNAME_P (DECL_NAME (t)) || LAMBDANAME_P (DECL_NAME (t))))
 120     return NULL;
 121   if (verbosity >= 2)
 122     return decl_as_string (t,
 123                            TFF_DECL_SPECIFIERS | TFF_UNQUALIFIED_NAME
 124                            | TFF_NO_OMIT_DEFAULT_TEMPLATE_ARGUMENTS);
 125
 126   return cxx_printable_name (t, verbosity);
 127 }
 128
 129 static enum classify_record
 130 cp_classify_record (tree type)
 131 {
 132   if (CLASSTYPE_DECLARED_CLASS (type))
 133     return RECORD_IS_CLASS;
 134
 135   return RECORD_IS_STRUCT;
 136 }
 137
 138 static GTY(()) tree cp_eh_personality_decl;
 139
 140 static tree
 141 cp_eh_personality (void)
 142 {
 143   if (!cp_eh_personality_decl)
 144     {
 145       const char *lang = (pragma_java_exceptions ? "gcj" : "gxx");
 146       cp_eh_personality_decl = build_personality_function (lang);
 147     }
 148
 149   return cp_eh_personality_decl;
 150 }
 151
 152 /* This is a subroutine of fold_cplus_constants.  It returns TRUE if T
 153    is a C++ specific constant that needs to be folded further before
 154    being passed to the debug info emitter.  */
 155
 156 static bool
 157 template_arg_needs_folding (const_tree t)
 158 {
 159   /* For now only PTRMEM_CST nodes are to be folded further.  */
 160   if (TREE_CODE (t) == PTRMEM_CST)
 161     return true;
 162   return false;
 163 }
 164
 165 /* Fold the elements of the TREE_VEC C which are C++ specific nodes
 166    that would need folding so that they can be processed by the debug
 167    info emitter. This is a subroutine of
 168    get_template_innermost_arguments_folded and
 169    get_template_argument_pack_elems_folded.  */
 170
 171 static tree
 172 fold_cplus_constants (const_tree c)
 173 {
 174   tree folded_elems, elems = CONST_CAST_TREE (c);
 175   int vec_len, i;
 176
 177   if (elems == NULL_TREE || elems == error_mark_node)
 178     return elems;
 179
 180   vec_len = TREE_VEC_LENGTH (elems);
 181
 182   /* First check if there is at least one element that needs
 183      folding. If there is none, we just return ELEMS. Otherwise create
 184      and return a new tree vector that contains the folded versions of
 185      ELEMS. This is to avoid allocating memory if we don't need
 186      to.  */
 187   for (i = 0; i < vec_len; ++i)
 188     {
 189       if (template_arg_needs_folding (TREE_VEC_ELT (elems, i)))
 190         break;
 191     }
 192   if (i == vec_len)
 193     return elems;
 194
 195   folded_elems = make_tree_vec (vec_len);
 196   for (i = 0; i < vec_len; ++i)
 197     {
 198       tree elem = TREE_VEC_ELT (elems, i);
 199       TREE_VEC_ELT (folded_elems, i) =
 200         (elem && !TYPE_P (elem)) ? cplus_expand_constant (elem) : elem;
 201
 202     }
 203   return folded_elems;
 204 }
 205
 206 /* The C++ implementation of the LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS
 207    hook. It returns the innermost template arguments of type T, and
 208    makes sure those arguments are folded enough for the debug info
 209    emitter.  */
 210
 211 static tree
 212 get_template_innermost_arguments_folded (const_tree t)
 213 {
 214   return fold_cplus_constants (get_template_innermost_arguments (t));
 215 }
 216
 217 static tree
 218 get_template_argument_pack_elems_folded (const_tree t)
 219 {
 220   return fold_cplus_constants (get_template_argument_pack_elems (t));
 221 }
 222
 223 #include "gt-cp-cp-lang.h"
 224 #include "gtype-cp.h"