1 /* Language-dependent hooks for C++. 2 Copyright (C) 2001-2013 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 (CLASSTYPE_DECLARED_CLASS (type)) 131 return RECORD_IS_CLASS; 132 133 return RECORD_IS_STRUCT; 134 } 135 136 static GTY(()) tree cp_eh_personality_decl; 137 138 static tree 139 cp_eh_personality (void) 140 { 141 if (!cp_eh_personality_decl) 142 { 143 const char *lang = (pragma_java_exceptions ? "gcj" : "gxx"); 144 cp_eh_personality_decl = build_personality_function (lang); 145 } 146 147 return cp_eh_personality_decl; 148 } 149 150 /* This is a subroutine of fold_cplus_constants. It returns TRUE if T 151 is a C++ specific constant that needs to be folded further before 152 being passed to the debug info emitter. */ 153 154 static bool 155 template_arg_needs_folding (const_tree t) 156 { 157 /* For now only PTRMEM_CST nodes are to be folded further. */ 158 if (TREE_CODE (t) == PTRMEM_CST) 159 return true; 160 return false; 161 } 162 163 /* Fold the elements of the TREE_VEC C which are C++ specific nodes 164 that would need folding so that they can be processed by the debug 165 info emitter. This is a subroutine of 166 get_template_innermost_arguments_folded and 167 get_template_argument_pack_elems_folded. */ 168 169 static tree 170 fold_cplus_constants (const_tree c) 171 { 172 tree folded_elems, elems = CONST_CAST_TREE (c); 173 int vec_len, i; 174 175 if (elems == NULL_TREE || elems == error_mark_node) 176 return elems; 177 178 vec_len = TREE_VEC_LENGTH (elems); 179 180 /* First check if there is at least one element that needs 181 folding. If there is none, we just return ELEMS. Otherwise create 182 and return a new tree vector that contains the folded versions of 183 ELEMS. This is to avoid allocating memory if we don't need 184 to. */ 185 for (i = 0; i < vec_len; ++i) 186 { 187 if (template_arg_needs_folding (TREE_VEC_ELT (elems, i))) 188 break; 189 } 190 if (i == vec_len) 191 return elems; 192 193 folded_elems = make_tree_vec (vec_len); 194 for (i = 0; i < vec_len; ++i) 195 { 196 tree elem = TREE_VEC_ELT (elems, i); 197 TREE_VEC_ELT (folded_elems, i) = 198 (elem && !TYPE_P (elem)) ? cplus_expand_constant (elem) : elem; 199 200 } 201 return folded_elems; 202 } 203 204 /* The C++ implementation of the LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS 205 hook. It returns the innermost template arguments of type T, and 206 makes sure those arguments are folded enough for the debug info 207 emitter. */ 208 209 static tree 210 get_template_innermost_arguments_folded (const_tree t) 211 { 212 return fold_cplus_constants (get_template_innermost_arguments (t)); 213 } 214 215 static tree 216 get_template_argument_pack_elems_folded (const_tree t) 217 { 218 return fold_cplus_constants (get_template_argument_pack_elems (t)); 219 } 220 221 #include "gt-cp-cp-lang.h" 222 #include "gtype-cp.h" 223