1 /* Language-dependent hooks for C++. 2 Copyright (C) 2001-2016 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 "cp-tree.h" 25 #include "stor-layout.h" 26 #include "langhooks.h" 27 #include "langhooks-def.h" 28 #include "cp-objcp-common.h" 29 30 enum c_language_kind c_language = clk_cxx; 31 static void cp_init_ts (void); 32 static const char * cxx_dwarf_name (tree t, int verbosity); 33 static enum classify_record cp_classify_record (tree type); 34 static tree cp_eh_personality (void); 35 static tree get_template_innermost_arguments_folded (const_tree); 36 static tree get_template_argument_pack_elems_folded (const_tree); 37 static tree cxx_enum_underlying_base_type (const_tree); 38 39 /* Lang hooks common to C++ and ObjC++ are declared in cp/cp-objcp-common.h; 40 consequently, there should be very few hooks below. */ 41 42 #undef LANG_HOOKS_NAME 43 #define LANG_HOOKS_NAME "GNU C++" 44 #undef LANG_HOOKS_INIT 45 #define LANG_HOOKS_INIT cxx_init 46 #undef LANG_HOOKS_CLASSIFY_RECORD 47 #define LANG_HOOKS_CLASSIFY_RECORD cp_classify_record 48 #undef LANG_HOOKS_GENERIC_TYPE_P 49 #define LANG_HOOKS_GENERIC_TYPE_P class_tmpl_impl_spec_p 50 51 #undef LANG_HOOKS_GET_INNERMOST_GENERIC_PARMS 52 #define LANG_HOOKS_GET_INNERMOST_GENERIC_PARMS \ 53 get_primary_template_innermost_parameters 54 #undef LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS 55 #define LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS \ 56 get_template_innermost_arguments_folded 57 #undef LANG_HOOKS_FUNCTION_PARAMETER_PACK_P 58 #define LANG_HOOKS_FUNCTION_PARAMETER_PACK_P \ 59 function_parameter_pack_p 60 #undef LANG_HOOKS_GET_ARGUMENT_PACK_ELEMS 61 #define LANG_HOOKS_GET_ARGUMENT_PACK_ELEMS \ 62 get_template_argument_pack_elems_folded 63 #undef LANG_HOOKS_GENERIC_GENERIC_PARAMETER_DECL_P 64 #define LANG_HOOKS_GENERIC_GENERIC_PARAMETER_DECL_P \ 65 template_template_parameter_p 66 #undef LANG_HOOKS_FUNCTION_PARM_EXPANDED_FROM_PACK_P 67 #define LANG_HOOKS_FUNCTION_PARM_EXPANDED_FROM_PACK_P \ 68 function_parameter_expanded_from_pack_p 69 #undef LANG_HOOKS_GET_GENERIC_FUNCTION_DECL 70 #define LANG_HOOKS_GET_GENERIC_FUNCTION_DECL get_function_template_decl 71 #undef LANG_HOOKS_DWARF_NAME 72 #define LANG_HOOKS_DWARF_NAME cxx_dwarf_name 73 #undef LANG_HOOKS_INIT_TS 74 #define LANG_HOOKS_INIT_TS cp_init_ts 75 #undef LANG_HOOKS_EH_PERSONALITY 76 #define LANG_HOOKS_EH_PERSONALITY cp_eh_personality 77 #undef LANG_HOOKS_EH_RUNTIME_TYPE 78 #define LANG_HOOKS_EH_RUNTIME_TYPE build_eh_type_type 79 #undef LANG_HOOKS_ENUM_UNDERLYING_BASE_TYPE 80 #define LANG_HOOKS_ENUM_UNDERLYING_BASE_TYPE cxx_enum_underlying_base_type 81 82 /* Each front end provides its own lang hook initializer. */ 83 struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER; 84 85 /* Lang hook routines common to C++ and ObjC++ appear in cp/cp-objcp-common.c; 86 there should be very few routines below. */ 87 88 /* The following function does something real, but only in Objective-C++. */ 89 90 tree 91 objcp_tsubst_copy_and_build (tree /*t*/, 92 tree /*args*/, 93 tsubst_flags_t /*complain*/, 94 tree /*in_decl*/, 95 bool /*function_p*/) 96 { 97 return NULL_TREE; 98 } 99 100 static void 101 cp_init_ts (void) 102 { 103 cp_common_init_ts (); 104 105 init_shadowed_var_for_decl (); 106 } 107 108 static const char * 109 cxx_dwarf_name (tree t, int verbosity) 110 { 111 gcc_assert (DECL_P (t)); 112 113 if (DECL_NAME (t) 114 && (anon_aggrname_p (DECL_NAME (t)) || LAMBDA_TYPE_P (t))) 115 return NULL; 116 if (verbosity >= 2) 117 return decl_as_dwarf_string (t, 118 TFF_DECL_SPECIFIERS | TFF_UNQUALIFIED_NAME 119 | TFF_NO_OMIT_DEFAULT_TEMPLATE_ARGUMENTS); 120 121 return lang_decl_dwarf_name (t, verbosity, false); 122 } 123 124 static enum classify_record 125 cp_classify_record (tree type) 126 { 127 if (TYPE_LANG_SPECIFIC (type) 128 && CLASSTYPE_DECLARED_CLASS (type)) 129 return RECORD_IS_CLASS; 130 131 return RECORD_IS_STRUCT; 132 } 133 134 static GTY(()) tree cp_eh_personality_decl; 135 136 static tree 137 cp_eh_personality (void) 138 { 139 if (!cp_eh_personality_decl) 140 { 141 const char *lang = (pragma_java_exceptions ? "gcj" : "gxx"); 142 cp_eh_personality_decl = build_personality_function (lang); 143 } 144 145 return cp_eh_personality_decl; 146 } 147 148 /* This is a subroutine of fold_cplus_constants. It returns TRUE if T 149 is a C++ specific constant that needs to be folded further before 150 being passed to the debug info emitter. */ 151 152 static bool 153 template_arg_needs_folding (const_tree t) 154 { 155 /* For now only PTRMEM_CST nodes are to be folded further. */ 156 if (TREE_CODE (t) == PTRMEM_CST) 157 return true; 158 return false; 159 } 160 161 /* Fold the elements of the TREE_VEC C which are C++ specific nodes 162 that would need folding so that they can be processed by the debug 163 info emitter. This is a subroutine of 164 get_template_innermost_arguments_folded and 165 get_template_argument_pack_elems_folded. */ 166 167 static tree 168 fold_cplus_constants (const_tree c) 169 { 170 tree folded_elems, elems = CONST_CAST_TREE (c); 171 int vec_len, i; 172 173 if (elems == NULL_TREE || elems == error_mark_node) 174 return elems; 175 176 vec_len = TREE_VEC_LENGTH (elems); 177 178 /* First check if there is at least one element that needs 179 folding. If there is none, we just return ELEMS. Otherwise create 180 and return a new tree vector that contains the folded versions of 181 ELEMS. This is to avoid allocating memory if we don't need 182 to. */ 183 for (i = 0; i < vec_len; ++i) 184 { 185 if (template_arg_needs_folding (TREE_VEC_ELT (elems, i))) 186 break; 187 } 188 if (i == vec_len) 189 return elems; 190 191 folded_elems = make_tree_vec (vec_len); 192 for (i = 0; i < vec_len; ++i) 193 { 194 tree elem = TREE_VEC_ELT (elems, i); 195 TREE_VEC_ELT (folded_elems, i) = 196 (elem && !TYPE_P (elem)) ? cplus_expand_constant (elem) : elem; 197 198 } 199 return folded_elems; 200 } 201 202 /* The C++ implementation of the LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS 203 hook. It returns the innermost template arguments of type T, and 204 makes sure those arguments are folded enough for the debug info 205 emitter. */ 206 207 static tree 208 get_template_innermost_arguments_folded (const_tree t) 209 { 210 return fold_cplus_constants (get_template_innermost_arguments (t)); 211 } 212 213 static tree 214 get_template_argument_pack_elems_folded (const_tree t) 215 { 216 return fold_cplus_constants (get_template_argument_pack_elems (t)); 217 } 218 219 /* The C++ version of the enum_underlying_base_type langhook. 220 See also cp/semantics.c (finish_underlying_type). */ 221 222 static 223 tree cxx_enum_underlying_base_type (const_tree type) 224 { 225 tree underlying_type = ENUM_UNDERLYING_TYPE (type); 226 227 if (! ENUM_FIXED_UNDERLYING_TYPE_P (type)) 228 underlying_type 229 = c_common_type_for_mode (TYPE_MODE (underlying_type), 230 TYPE_UNSIGNED (underlying_type)); 231 232 return underlying_type; 233 } 234 235 #include "gt-cp-cp-lang.h" 236 #include "gtype-cp.h" 237