1 /* Language-dependent hooks for C++. 2 Copyright (C) 2001-2019 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 const char * cxx_dwarf_name (tree t, int verbosity); 32 static enum classify_record cp_classify_record (tree type); 33 static tree cp_eh_personality (void); 34 static tree get_template_innermost_arguments_folded (const_tree); 35 static tree get_template_argument_pack_elems_folded (const_tree); 36 static tree cxx_enum_underlying_base_type (const_tree); 37 38 /* Lang hooks common to C++ and ObjC++ are declared in cp/cp-objcp-common.h; 39 consequently, there should be very few hooks below. */ 40 41 #undef LANG_HOOKS_NAME 42 #define LANG_HOOKS_NAME "GNU C++" 43 #undef LANG_HOOKS_INIT 44 #define LANG_HOOKS_INIT cxx_init 45 #undef LANG_HOOKS_CLASSIFY_RECORD 46 #define LANG_HOOKS_CLASSIFY_RECORD cp_classify_record 47 #undef LANG_HOOKS_GENERIC_TYPE_P 48 #define LANG_HOOKS_GENERIC_TYPE_P class_tmpl_impl_spec_p 49 50 #undef LANG_HOOKS_GET_INNERMOST_GENERIC_PARMS 51 #define LANG_HOOKS_GET_INNERMOST_GENERIC_PARMS \ 52 get_primary_template_innermost_parameters 53 #undef LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS 54 #define LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS \ 55 get_template_innermost_arguments_folded 56 #undef LANG_HOOKS_FUNCTION_PARAMETER_PACK_P 57 #define LANG_HOOKS_FUNCTION_PARAMETER_PACK_P \ 58 function_parameter_pack_p 59 #undef LANG_HOOKS_GET_ARGUMENT_PACK_ELEMS 60 #define LANG_HOOKS_GET_ARGUMENT_PACK_ELEMS \ 61 get_template_argument_pack_elems_folded 62 #undef LANG_HOOKS_GENERIC_GENERIC_PARAMETER_DECL_P 63 #define LANG_HOOKS_GENERIC_GENERIC_PARAMETER_DECL_P \ 64 template_template_parameter_p 65 #undef LANG_HOOKS_FUNCTION_PARM_EXPANDED_FROM_PACK_P 66 #define LANG_HOOKS_FUNCTION_PARM_EXPANDED_FROM_PACK_P \ 67 function_parameter_expanded_from_pack_p 68 #undef LANG_HOOKS_GET_GENERIC_FUNCTION_DECL 69 #define LANG_HOOKS_GET_GENERIC_FUNCTION_DECL get_function_template_decl 70 #undef LANG_HOOKS_DWARF_NAME 71 #define LANG_HOOKS_DWARF_NAME cxx_dwarf_name 72 #undef LANG_HOOKS_INIT_TS 73 #define LANG_HOOKS_INIT_TS cp_common_init_ts 74 #undef LANG_HOOKS_EH_PERSONALITY 75 #define LANG_HOOKS_EH_PERSONALITY cp_eh_personality 76 #undef LANG_HOOKS_EH_RUNTIME_TYPE 77 #define LANG_HOOKS_EH_RUNTIME_TYPE build_eh_type_type 78 #undef LANG_HOOKS_ENUM_UNDERLYING_BASE_TYPE 79 #define LANG_HOOKS_ENUM_UNDERLYING_BASE_TYPE cxx_enum_underlying_base_type 80 81 #if CHECKING_P 82 #undef LANG_HOOKS_RUN_LANG_SELFTESTS 83 #define LANG_HOOKS_RUN_LANG_SELFTESTS selftest::run_cp_tests 84 #endif /* #if CHECKING_P */ 85 86 #undef LANG_HOOKS_GET_SUBSTRING_LOCATION 87 #define LANG_HOOKS_GET_SUBSTRING_LOCATION c_get_substring_location 88 89 /* Each front end provides its own lang hook initializer. */ 90 struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER; 91 92 /* Lang hook routines common to C++ and ObjC++ appear in cp/cp-objcp-common.c; 93 there should be very few routines below. */ 94 95 /* The following function does something real, but only in Objective-C++. */ 96 97 tree 98 objcp_tsubst_copy_and_build (tree /*t*/, 99 tree /*args*/, 100 tsubst_flags_t /*complain*/, 101 tree /*in_decl*/, 102 bool /*function_p*/) 103 { 104 return NULL_TREE; 105 } 106 107 static const char * 108 cxx_dwarf_name (tree t, int verbosity) 109 { 110 gcc_assert (DECL_P (t)); 111 112 if (DECL_NAME (t) 113 && (anon_aggrname_p (DECL_NAME (t)) || LAMBDA_TYPE_P (t))) 114 return NULL; 115 if (verbosity >= 2) 116 return decl_as_dwarf_string (t, 117 TFF_DECL_SPECIFIERS | TFF_UNQUALIFIED_NAME 118 | TFF_NO_OMIT_DEFAULT_TEMPLATE_ARGUMENTS); 119 120 return lang_decl_dwarf_name (t, verbosity, false); 121 } 122 123 static enum classify_record 124 cp_classify_record (tree type) 125 { 126 if (TYPE_LANG_SPECIFIC (type) 127 && CLASSTYPE_DECLARED_CLASS (type)) 128 return RECORD_IS_CLASS; 129 130 return RECORD_IS_STRUCT; 131 } 132 133 static GTY(()) tree cp_eh_personality_decl; 134 135 static tree 136 cp_eh_personality (void) 137 { 138 if (!cp_eh_personality_decl) 139 cp_eh_personality_decl = build_personality_function ("gxx"); 140 141 return cp_eh_personality_decl; 142 } 143 144 /* This is a subroutine of fold_cplus_constants. It returns TRUE if T 145 is a C++ specific constant that needs to be folded further before 146 being passed to the debug info emitter. */ 147 148 static bool 149 template_arg_needs_folding (const_tree t) 150 { 151 /* For now only PTRMEM_CST nodes are to be folded further. */ 152 if (TREE_CODE (t) == PTRMEM_CST) 153 return true; 154 return false; 155 } 156 157 /* Fold the elements of the TREE_VEC C which are C++ specific nodes 158 that would need folding so that they can be processed by the debug 159 info emitter. This is a subroutine of 160 get_template_innermost_arguments_folded and 161 get_template_argument_pack_elems_folded. */ 162 163 static tree 164 fold_cplus_constants (const_tree c) 165 { 166 tree folded_elems, elems = CONST_CAST_TREE (c); 167 int vec_len, i; 168 169 if (elems == NULL_TREE || elems == error_mark_node) 170 return elems; 171 172 vec_len = TREE_VEC_LENGTH (elems); 173 174 /* First check if there is at least one element that needs 175 folding. If there is none, we just return ELEMS. Otherwise create 176 and return a new tree vector that contains the folded versions of 177 ELEMS. This is to avoid allocating memory if we don't need 178 to. */ 179 for (i = 0; i < vec_len; ++i) 180 { 181 if (template_arg_needs_folding (TREE_VEC_ELT (elems, i))) 182 break; 183 } 184 if (i == vec_len) 185 return elems; 186 187 folded_elems = make_tree_vec (vec_len); 188 for (i = 0; i < vec_len; ++i) 189 { 190 tree elem = TREE_VEC_ELT (elems, i); 191 TREE_VEC_ELT (folded_elems, i) = 192 (elem && !TYPE_P (elem)) ? cplus_expand_constant (elem) : elem; 193 194 } 195 return folded_elems; 196 } 197 198 /* The C++ implementation of the LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS 199 hook. It returns the innermost template arguments of type T, and 200 makes sure those arguments are folded enough for the debug info 201 emitter. */ 202 203 static tree 204 get_template_innermost_arguments_folded (const_tree t) 205 { 206 return fold_cplus_constants (get_template_innermost_arguments (t)); 207 } 208 209 static tree 210 get_template_argument_pack_elems_folded (const_tree t) 211 { 212 return fold_cplus_constants (get_template_argument_pack_elems (t)); 213 } 214 215 /* The C++ version of the enum_underlying_base_type langhook. 216 See also cp/semantics.c (finish_underlying_type). */ 217 218 static 219 tree cxx_enum_underlying_base_type (const_tree type) 220 { 221 tree underlying_type = ENUM_UNDERLYING_TYPE (type); 222 223 if (! ENUM_FIXED_UNDERLYING_TYPE_P (type)) 224 underlying_type 225 = c_common_type_for_mode (TYPE_MODE (underlying_type), 226 TYPE_UNSIGNED (underlying_type)); 227 228 return underlying_type; 229 } 230 231 #if CHECKING_P 232 233 namespace selftest { 234 235 /* Implementation of LANG_HOOKS_RUN_LANG_SELFTESTS for the C++ frontend. */ 236 237 void 238 run_cp_tests (void) 239 { 240 /* Run selftests shared within the C family. */ 241 c_family_tests (); 242 243 /* Additional C++-specific tests. */ 244 cp_pt_c_tests (); 245 cp_tree_c_tests (); 246 } 247 248 } // namespace selftest 249 250 #endif /* #if CHECKING_P */ 251 252 253 #include "gt-cp-cp-lang.h" 254 #include "gtype-cp.h" 255