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
 106 static void
 107 cp_init_ts (void)
 108 {
 109   tree_contains_struct[NAMESPACE_DECL][TS_DECL_NON_COMMON] = 1;
 110   tree_contains_struct[USING_DECL][TS_DECL_NON_COMMON] = 1;
 111   tree_contains_struct[TEMPLATE_DECL][TS_DECL_NON_COMMON] = 1;
 112
 113   tree_contains_struct[NAMESPACE_DECL][TS_DECL_WITH_VIS] = 1;
 114   tree_contains_struct[USING_DECL][TS_DECL_WITH_VIS] = 1;
 115   tree_contains_struct[TEMPLATE_DECL][TS_DECL_WITH_VIS] = 1;
 116
 117   tree_contains_struct[NAMESPACE_DECL][TS_DECL_WRTL] = 1;
 118   tree_contains_struct[USING_DECL][TS_DECL_WRTL] = 1;
 119   tree_contains_struct[TEMPLATE_DECL][TS_DECL_WRTL] = 1;
 120
 121   tree_contains_struct[NAMESPACE_DECL][TS_DECL_COMMON] = 1;
 122   tree_contains_struct[USING_DECL][TS_DECL_COMMON] = 1;
 123   tree_contains_struct[TEMPLATE_DECL][TS_DECL_COMMON] = 1;
 124
 125   tree_contains_struct[NAMESPACE_DECL][TS_DECL_MINIMAL] = 1;
 126   tree_contains_struct[USING_DECL][TS_DECL_MINIMAL] = 1;
 127   tree_contains_struct[TEMPLATE_DECL][TS_DECL_MINIMAL] = 1;
 128
 129   init_shadowed_var_for_decl ();
 130
 131 }
 132
 133 static const char *
 134 cxx_dwarf_name (tree t, int verbosity)
 135 {
 136   gcc_assert (DECL_P (t));
 137
 138   if (DECL_NAME (t)
 139       && (ANON_AGGRNAME_P (DECL_NAME (t)) || LAMBDANAME_P (DECL_NAME (t))))
 140     return NULL;
 141   if (verbosity >= 2)
 142     return decl_as_string (t,
 143                            TFF_DECL_SPECIFIERS | TFF_UNQUALIFIED_NAME
 144                            | TFF_NO_OMIT_DEFAULT_TEMPLATE_ARGUMENTS);
 145
 146   return cxx_printable_name (t, verbosity);
 147 }
 148
 149 static enum classify_record
 150 cp_classify_record (tree type)
 151 {
 152   if (CLASSTYPE_DECLARED_CLASS (type))
 153     return RECORD_IS_CLASS;
 154
 155   return RECORD_IS_STRUCT;
 156 }
 157
 158 static GTY(()) tree cp_eh_personality_decl;
 159
 160 static tree
 161 cp_eh_personality (void)
 162 {
 163   if (!cp_eh_personality_decl)
 164     {
 165       const char *lang = (pragma_java_exceptions ? "gcj" : "gxx");
 166       cp_eh_personality_decl = build_personality_function (lang);
 167     }
 168
 169   return cp_eh_personality_decl;
 170 }
 171
 172 /* This is a subroutine of fold_cplus_constants.  It returns TRUE if T
 173    is a C++ specific constant that needs to be folded further before
 174    being passed to the debug info emitter.  */
 175
 176 static bool
 177 template_arg_needs_folding (const_tree t)
 178 {
 179   /* For now only PTRMEM_CST nodes are to be folded further.  */
 180   if (TREE_CODE (t) == PTRMEM_CST)
 181     return true;
 182   return false;
 183 }
 184
 185 /* Fold the elements of the TREE_VEC C which are C++ specific nodes
 186    that would need folding so that they can be processed by the debug
 187    info emitter. This is a subroutine of
 188    get_template_innermost_arguments_folded and
 189    get_template_argument_pack_elems_folded.  */
 190
 191 static tree
 192 fold_cplus_constants (const_tree c)
 193 {
 194   tree folded_elems, elems = CONST_CAST_TREE (c);
 195   int vec_len, i;
 196
 197   if (elems == NULL_TREE || elems == error_mark_node)
 198     return elems;
 199
 200   vec_len = TREE_VEC_LENGTH (elems);
 201
 202   /* First check if there is at least one element that needs
 203      folding. If there is none, we just return ELEMS. Otherwise create
 204      and return a new tree vector that contains the folded versions of
 205      ELEMS. This is to avoid allocating memory if we don't need
 206      to.  */
 207   for (i = 0; i < vec_len; ++i)
 208     {
 209       if (template_arg_needs_folding (TREE_VEC_ELT (elems, i)))
 210         break;
 211     }
 212   if (i == vec_len)
 213     return elems;
 214
 215   folded_elems = make_tree_vec (vec_len);
 216   for (i = 0; i < vec_len; ++i)
 217     {
 218       tree elem = TREE_VEC_ELT (elems, i);
 219       TREE_VEC_ELT (folded_elems, i) =
 220         (elem && !TYPE_P (elem)) ? cplus_expand_constant (elem) : elem;
 221
 222     }
 223   return folded_elems;
 224 }
 225
 226 /* The C++ implementation of the LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS
 227    hook. It returns the innermost template arguments of type T, and
 228    makes sure those arguments are folded enough for the debug info
 229    emitter.  */
 230
 231 static tree
 232 get_template_innermost_arguments_folded (const_tree t)
 233 {
 234   return fold_cplus_constants (get_template_innermost_arguments (t));
 235 }
 236
 237 static tree
 238 get_template_argument_pack_elems_folded (const_tree t)
 239 {
 240   return fold_cplus_constants (get_template_argument_pack_elems (t));
 241 }
 242
 243 #include "gt-cp-cp-lang.h"
 244 #include "gtype-cp.h"