gcc/cp/cp-lang.c

   1 /* Language-dependent hooks for C++.
   2    Copyright (C) 2001-2014 Free Software Foundation, Inc.
   3    Contributed by Alexandre Oliva  <aoliva@redhat.com>
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #include "config.h"
  22 #include "system.h"
  23 #include "coretypes.h"
  24 #include "tm.h"
  25 #include "tree.h"
  26 #include "cp-tree.h"
  27 #include "c-family/c-common.h"
  28 #include "langhooks.h"
  29 #include "langhooks-def.h"
  30 #include "debug.h"
  31 #include "cp-objcp-common.h"
  32 #include "hashtab.h"
  33 #include "target.h"
  34 #include "parser.h"
  35
  36 enum c_language_kind c_language = clk_cxx;
  37 static void cp_init_ts (void);
  38 static const char * cxx_dwarf_name (tree t, int verbosity);
  39 static enum classify_record cp_classify_record (tree type);
  40 static tree cp_eh_personality (void);
  41 static tree get_template_innermost_arguments_folded (const_tree);
  42 static tree get_template_argument_pack_elems_folded (const_tree);
  43
  44 /* Lang hooks common to C++ and ObjC++ are declared in cp/cp-objcp-common.h;
  45    consequently, there should be very few hooks below.  */
  46
  47 #undef LANG_HOOKS_NAME
  48 #define LANG_HOOKS_NAME "GNU C++"
  49 #undef LANG_HOOKS_INIT
  50 #define LANG_HOOKS_INIT cxx_init
  51 #undef LANG_HOOKS_CLASSIFY_RECORD
  52 #define LANG_HOOKS_CLASSIFY_RECORD cp_classify_record
  53 #undef LANG_HOOKS_GENERIC_TYPE_P
  54 #define LANG_HOOKS_GENERIC_TYPE_P class_tmpl_impl_spec_p
  55
  56 #undef LANG_HOOKS_GET_INNERMOST_GENERIC_PARMS
  57 #define LANG_HOOKS_GET_INNERMOST_GENERIC_PARMS \
  58         get_primary_template_innermost_parameters
  59 #undef LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS
  60 #define LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS \
  61         get_template_innermost_arguments_folded
  62 #undef LANG_HOOKS_FUNCTION_PARAMETER_PACK_P
  63 #define LANG_HOOKS_FUNCTION_PARAMETER_PACK_P \
  64         function_parameter_pack_p
  65 #undef LANG_HOOKS_GET_ARGUMENT_PACK_ELEMS
  66 #define LANG_HOOKS_GET_ARGUMENT_PACK_ELEMS \
  67         get_template_argument_pack_elems_folded
  68 #undef LANG_HOOKS_GENERIC_GENERIC_PARAMETER_DECL_P
  69 #define LANG_HOOKS_GENERIC_GENERIC_PARAMETER_DECL_P \
  70         template_template_parameter_p
  71 #undef LANG_HOOKS_FUNCTION_PARM_EXPANDED_FROM_PACK_P
  72 #define LANG_HOOKS_FUNCTION_PARM_EXPANDED_FROM_PACK_P \
  73         function_parameter_expanded_from_pack_p
  74 #undef LANG_HOOKS_GET_GENERIC_FUNCTION_DECL
  75 #define LANG_HOOKS_GET_GENERIC_FUNCTION_DECL get_function_template_decl
  76 #undef LANG_HOOKS_DWARF_NAME
  77 #define LANG_HOOKS_DWARF_NAME cxx_dwarf_name
  78 #undef LANG_HOOKS_INIT_TS
  79 #define LANG_HOOKS_INIT_TS cp_init_ts
  80 #undef LANG_HOOKS_EH_PERSONALITY
  81 #define LANG_HOOKS_EH_PERSONALITY cp_eh_personality
  82 #undef LANG_HOOKS_EH_RUNTIME_TYPE
  83 #define LANG_HOOKS_EH_RUNTIME_TYPE build_eh_type_type
  84
  85 /* Each front end provides its own lang hook initializer.  */
  86 struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;
  87
  88 /* Lang hook routines common to C++ and ObjC++ appear in cp/cp-objcp-common.c;
  89    there should be very few routines below.  */
  90
  91 /* The following function does something real, but only in Objective-C++.  */
  92
  93 tree
  94 objcp_tsubst_copy_and_build (tree /*t*/,
  95                              tree /*args*/,
  96                              tsubst_flags_t /*complain*/,
  97                              tree /*in_decl*/,
  98                              bool /*function_p*/)
  99 {
 100   return NULL_TREE;
 101 }
 102
 103 static void
 104 cp_init_ts (void)
 105 {
 106   cp_common_init_ts ();
 107
 108   init_shadowed_var_for_decl ();
 109 }
 110
 111 static const char *
 112 cxx_dwarf_name (tree t, int verbosity)
 113 {
 114   gcc_assert (DECL_P (t));
 115
 116   if (DECL_NAME (t)
 117       && (ANON_AGGRNAME_P (DECL_NAME (t)) || LAMBDA_TYPE_P (t)))
 118     return NULL;
 119   if (verbosity >= 2)
 120     return decl_as_dwarf_string (t,
 121                                  TFF_DECL_SPECIFIERS | TFF_UNQUALIFIED_NAME
 122                                  | TFF_NO_OMIT_DEFAULT_TEMPLATE_ARGUMENTS);
 123
 124   return lang_decl_dwarf_name (t, verbosity, false);
 125 }
 126
 127 static enum classify_record
 128 cp_classify_record (tree type)
 129 {
 130   if (TYPE_LANG_SPECIFIC (type)
 131       && CLASSTYPE_DECLARED_CLASS (type))
 132     return RECORD_IS_CLASS;
 133
 134   return RECORD_IS_STRUCT;
 135 }
 136
 137 static GTY(()) tree cp_eh_personality_decl;
 138
 139 static tree
 140 cp_eh_personality (void)
 141 {
 142   if (!cp_eh_personality_decl)
 143     {
 144       const char *lang = (pragma_java_exceptions ? "gcj" : "gxx");
 145       cp_eh_personality_decl = build_personality_function (lang);
 146     }
 147
 148   return cp_eh_personality_decl;
 149 }
 150
 151 /* This is a subroutine of fold_cplus_constants.  It returns TRUE if T
 152    is a C++ specific constant that needs to be folded further before
 153    being passed to the debug info emitter.  */
 154
 155 static bool
 156 template_arg_needs_folding (const_tree t)
 157 {
 158   /* For now only PTRMEM_CST nodes are to be folded further.  */
 159   if (TREE_CODE (t) == PTRMEM_CST)
 160     return true;
 161   return false;
 162 }
 163
 164 /* Fold the elements of the TREE_VEC C which are C++ specific nodes
 165    that would need folding so that they can be processed by the debug
 166    info emitter. This is a subroutine of
 167    get_template_innermost_arguments_folded and
 168    get_template_argument_pack_elems_folded.  */
 169
 170 static tree
 171 fold_cplus_constants (const_tree c)
 172 {
 173   tree folded_elems, elems = CONST_CAST_TREE (c);
 174   int vec_len, i;
 175
 176   if (elems == NULL_TREE || elems == error_mark_node)
 177     return elems;
 178
 179   vec_len = TREE_VEC_LENGTH (elems);
 180
 181   /* First check if there is at least one element that needs
 182      folding. If there is none, we just return ELEMS. Otherwise create
 183      and return a new tree vector that contains the folded versions of
 184      ELEMS. This is to avoid allocating memory if we don't need
 185      to.  */
 186   for (i = 0; i < vec_len; ++i)
 187     {
 188       if (template_arg_needs_folding (TREE_VEC_ELT (elems, i)))
 189         break;
 190     }
 191   if (i == vec_len)
 192     return elems;
 193
 194   folded_elems = make_tree_vec (vec_len);
 195   for (i = 0; i < vec_len; ++i)
 196     {
 197       tree elem = TREE_VEC_ELT (elems, i);
 198       TREE_VEC_ELT (folded_elems, i) =
 199         (elem && !TYPE_P (elem)) ? cplus_expand_constant (elem) : elem;
 200
 201     }
 202   return folded_elems;
 203 }
 204
 205 /* The C++ implementation of the LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS
 206    hook. It returns the innermost template arguments of type T, and
 207    makes sure those arguments are folded enough for the debug info
 208    emitter.  */
 209
 210 static tree
 211 get_template_innermost_arguments_folded (const_tree t)
 212 {
 213   return fold_cplus_constants (get_template_innermost_arguments (t));
 214 }
 215
 216 static tree
 217 get_template_argument_pack_elems_folded (const_tree t)
 218 {
 219   return fold_cplus_constants (get_template_argument_pack_elems (t));
 220 }
 221
 222 #include "gt-cp-cp-lang.h"
 223 #include "gtype-cp.h"