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
  37 enum c_language_kind c_language = clk_cxx;
  38 static void cp_init_ts (void);
  39 static const char * cxx_dwarf_name (tree t, int verbosity);
  40 static enum classify_record cp_classify_record (tree type);
  41 static tree cp_eh_personality (void);
  42 static tree get_template_innermost_arguments_folded (const_tree);
  43 static tree get_template_argument_pack_elems_folded (const_tree);
  44
  45 /* Lang hooks common to C++ and ObjC++ are declared in cp/cp-objcp-common.h;
  46    consequently, there should be very few hooks below.  */
  47
  48 #undef LANG_HOOKS_NAME
  49 #define LANG_HOOKS_NAME "GNU C++"
  50 #undef LANG_HOOKS_INIT
  51 #define LANG_HOOKS_INIT cxx_init
  52 #undef LANG_HOOKS_CLASSIFY_RECORD
  53 #define LANG_HOOKS_CLASSIFY_RECORD cp_classify_record
  54 #undef LANG_HOOKS_GENERIC_TYPE_P
  55 #define LANG_HOOKS_GENERIC_TYPE_P class_tmpl_impl_spec_p
  56
  57 #undef LANG_HOOKS_GET_INNERMOST_GENERIC_PARMS
  58 #define LANG_HOOKS_GET_INNERMOST_GENERIC_PARMS \
  59         get_primary_template_innermost_parameters
  60 #undef LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS
  61 #define LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS \
  62         get_template_innermost_arguments_folded
  63 #undef LANG_HOOKS_FUNCTION_PARAMETER_PACK_P
  64 #define LANG_HOOKS_FUNCTION_PARAMETER_PACK_P \
  65         function_parameter_pack_p
  66 #undef LANG_HOOKS_GET_ARGUMENT_PACK_ELEMS
  67 #define LANG_HOOKS_GET_ARGUMENT_PACK_ELEMS \
  68         get_template_argument_pack_elems_folded
  69 #undef LANG_HOOKS_GENERIC_GENERIC_PARAMETER_DECL_P
  70 #define LANG_HOOKS_GENERIC_GENERIC_PARAMETER_DECL_P \
  71         template_template_parameter_p
  72 #undef LANG_HOOKS_FUNCTION_PARM_EXPANDED_FROM_PACK_P
  73 #define LANG_HOOKS_FUNCTION_PARM_EXPANDED_FROM_PACK_P \
  74         function_parameter_expanded_from_pack_p
  75 #undef LANG_HOOKS_GET_GENERIC_FUNCTION_DECL
  76 #define LANG_HOOKS_GET_GENERIC_FUNCTION_DECL get_function_template_decl
  77 #undef LANG_HOOKS_DWARF_NAME
  78 #define LANG_HOOKS_DWARF_NAME cxx_dwarf_name
  79 #undef LANG_HOOKS_INIT_TS
  80 #define LANG_HOOKS_INIT_TS cp_init_ts
  81 #undef LANG_HOOKS_EH_PERSONALITY
  82 #define LANG_HOOKS_EH_PERSONALITY cp_eh_personality
  83 #undef LANG_HOOKS_EH_RUNTIME_TYPE
  84 #define LANG_HOOKS_EH_RUNTIME_TYPE build_eh_type_type
  85
  86 /* Each front end provides its own lang hook initializer.  */
  87 struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;
  88
  89 /* Lang hook routines common to C++ and ObjC++ appear in cp/cp-objcp-common.c;
  90    there should be very few routines below.  */
  91
  92 /* The following function does something real, but only in Objective-C++.  */
  93
  94 tree
  95 objcp_tsubst_copy_and_build (tree t ATTRIBUTE_UNUSED,
  96                              tree args ATTRIBUTE_UNUSED,
  97                              tsubst_flags_t complain ATTRIBUTE_UNUSED,
  98                              tree in_decl ATTRIBUTE_UNUSED,
  99                              bool function_p ATTRIBUTE_UNUSED)
 100 {
 101   return NULL_TREE;
 102 }
 103
 104
 105 static void
 106 cp_init_ts (void)
 107 {
 108   tree_contains_struct[NAMESPACE_DECL][TS_DECL_NON_COMMON] = 1;
 109   tree_contains_struct[USING_DECL][TS_DECL_NON_COMMON] = 1;
 110   tree_contains_struct[TEMPLATE_DECL][TS_DECL_NON_COMMON] = 1;
 111
 112   tree_contains_struct[NAMESPACE_DECL][TS_DECL_WITH_VIS] = 1;
 113   tree_contains_struct[USING_DECL][TS_DECL_WITH_VIS] = 1;
 114   tree_contains_struct[TEMPLATE_DECL][TS_DECL_WITH_VIS] = 1;
 115
 116   tree_contains_struct[NAMESPACE_DECL][TS_DECL_WRTL] = 1;
 117   tree_contains_struct[USING_DECL][TS_DECL_WRTL] = 1;
 118   tree_contains_struct[TEMPLATE_DECL][TS_DECL_WRTL] = 1;
 119
 120   tree_contains_struct[NAMESPACE_DECL][TS_DECL_COMMON] = 1;
 121   tree_contains_struct[USING_DECL][TS_DECL_COMMON] = 1;
 122   tree_contains_struct[TEMPLATE_DECL][TS_DECL_COMMON] = 1;
 123
 124   tree_contains_struct[NAMESPACE_DECL][TS_DECL_MINIMAL] = 1;
 125   tree_contains_struct[USING_DECL][TS_DECL_MINIMAL] = 1;
 126   tree_contains_struct[TEMPLATE_DECL][TS_DECL_MINIMAL] = 1;
 127
 128   init_shadowed_var_for_decl ();
 129
 130 }
 131
 132 static const char *
 133 cxx_dwarf_name (tree t, int verbosity)
 134 {
 135   gcc_assert (DECL_P (t));
 136
 137   if (DECL_NAME (t)
 138       && (ANON_AGGRNAME_P (DECL_NAME (t)) || LAMBDANAME_P (DECL_NAME (t))))
 139     return NULL;
 140   if (verbosity >= 2)
 141     return decl_as_string (t,
 142                            TFF_DECL_SPECIFIERS | TFF_UNQUALIFIED_NAME
 143                            | TFF_NO_OMIT_DEFAULT_TEMPLATE_ARGUMENTS);
 144
 145   return cxx_printable_name (t, verbosity);
 146 }
 147
 148 static enum classify_record
 149 cp_classify_record (tree type)
 150 {
 151   if (CLASSTYPE_DECLARED_CLASS (type))
 152     return RECORD_IS_CLASS;
 153
 154   return RECORD_IS_STRUCT;
 155 }
 156
 157 static GTY(()) tree cp_eh_personality_decl;
 158
 159 static tree
 160 cp_eh_personality (void)
 161 {
 162   if (!cp_eh_personality_decl)
 163     {
 164       const char *lang = (pragma_java_exceptions ? "gcj" : "gxx");
 165       cp_eh_personality_decl = build_personality_function (lang);
 166     }
 167
 168   return cp_eh_personality_decl;
 169 }
 170
 171 /* This is a subroutine of fold_cplus_constants.  It returns TRUE if T
 172    is a C++ specific constant that needs to be folded further before
 173    being passed to the debug info emitter.  */
 174
 175 static bool
 176 template_arg_needs_folding (const_tree t)
 177 {
 178   /* For now only PTRMEM_CST nodes are to be folded further.  */
 179   if (TREE_CODE (t) == PTRMEM_CST)
 180     return true;
 181   return false;
 182 }
 183
 184 /* Fold the elements of the TREE_VEC C which are C++ specific nodes
 185    that would need folding so that they can be processed by the debug
 186    info emitter. This is a subroutine of
 187    get_template_innermost_arguments_folded and
 188    get_template_argument_pack_elems_folded.  */
 189
 190 static tree
 191 fold_cplus_constants (const_tree c)
 192 {
 193   tree folded_elems, elems = CONST_CAST_TREE (c);
 194   int vec_len, i;
 195
 196   if (elems == NULL_TREE || elems == error_mark_node)
 197     return elems;
 198
 199   vec_len = TREE_VEC_LENGTH (elems);
 200
 201   /* First check if there is at least one element that needs
 202      folding. If there is none, we just return ELEMS. Otherwise create
 203      and return a new tree vector that contains the folded versions of
 204      ELEMS. This is to avoid allocating memory if we don't need
 205      to.  */
 206   for (i = 0; i < vec_len; ++i)
 207     {
 208       if (template_arg_needs_folding (TREE_VEC_ELT (elems, i)))
 209         break;
 210     }
 211   if (i == vec_len)
 212     return elems;
 213
 214   folded_elems = make_tree_vec (vec_len);
 215   for (i = 0; i < vec_len; ++i)
 216     {
 217       tree elem = TREE_VEC_ELT (elems, i);
 218       TREE_VEC_ELT (folded_elems, i) =
 219         (elem && !TYPE_P (elem)) ? cplus_expand_constant (elem) : elem;
 220
 221     }
 222   return folded_elems;
 223 }
 224
 225 /* The C++ implementation of the LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS
 226    hook. It returns the innermost template arguments of type T, and
 227    makes sure those arguments are folded enough for the debug info
 228    emitter.  */
 229
 230 static tree
 231 get_template_innermost_arguments_folded (const_tree t)
 232 {
 233   return fold_cplus_constants (get_template_innermost_arguments (t));
 234 }
 235
 236 static tree
 237 get_template_argument_pack_elems_folded (const_tree t)
 238 {
 239   return fold_cplus_constants (get_template_argument_pack_elems (t));
 240 }
 241
 242 #include "gt-cp-cp-lang.h"
 243 #include "gtype-cp.h"