1 /* Language-dependent hooks for C++. 2 Copyright (C) 2001-2018 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 #if CHECKING_P 83 #undef LANG_HOOKS_RUN_LANG_SELFTESTS 84 #define LANG_HOOKS_RUN_LANG_SELFTESTS selftest::run_cp_tests 85 #endif /* #if CHECKING_P */ 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*/, 97 tree /*args*/, 98 tsubst_flags_t /*complain*/, 99 tree /*in_decl*/, 100 bool /*function_p*/) 101 { 102 return NULL_TREE; 103 } 104 105 static void 106 cp_init_ts (void) 107 { 108 cp_common_init_ts (); 109 110 init_shadowed_var_for_decl (); 111 } 112 113 static const char * 114 cxx_dwarf_name (tree t, int verbosity) 115 { 116 gcc_assert (DECL_P (t)); 117 118 if (DECL_NAME (t) 119 && (anon_aggrname_p (DECL_NAME (t)) || LAMBDA_TYPE_P (t))) 120 return NULL; 121 if (verbosity >= 2) 122 return decl_as_dwarf_string (t, 123 TFF_DECL_SPECIFIERS | TFF_UNQUALIFIED_NAME 124 | TFF_NO_OMIT_DEFAULT_TEMPLATE_ARGUMENTS); 125 126 return lang_decl_dwarf_name (t, verbosity, false); 127 } 128 129 static enum classify_record 130 cp_classify_record (tree type) 131 { 132 if (TYPE_LANG_SPECIFIC (type) 133 && CLASSTYPE_DECLARED_CLASS (type)) 134 return RECORD_IS_CLASS; 135 136 return RECORD_IS_STRUCT; 137 } 138 139 static GTY(()) tree cp_eh_personality_decl; 140 141 static tree 142 cp_eh_personality (void) 143 { 144 if (!cp_eh_personality_decl) 145 cp_eh_personality_decl = build_personality_function ("gxx"); 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 /* The C++ version of the enum_underlying_base_type langhook. 222 See also cp/semantics.c (finish_underlying_type). */ 223 224 static 225 tree cxx_enum_underlying_base_type (const_tree type) 226 { 227 tree underlying_type = ENUM_UNDERLYING_TYPE (type); 228 229 if (! ENUM_FIXED_UNDERLYING_TYPE_P (type)) 230 underlying_type 231 = c_common_type_for_mode (TYPE_MODE (underlying_type), 232 TYPE_UNSIGNED (underlying_type)); 233 234 return underlying_type; 235 } 236 237 #if CHECKING_P 238 239 namespace selftest { 240 241 /* Implementation of LANG_HOOKS_RUN_LANG_SELFTESTS for the C++ frontend. */ 242 243 void 244 run_cp_tests (void) 245 { 246 /* Run selftests shared within the C family. */ 247 c_family_tests (); 248 249 /* Additional C++-specific tests. */ 250 cp_pt_c_tests (); 251 cp_tree_c_tests (); 252 } 253 254 } // namespace selftest 255 256 #endif /* #if CHECKING_P */ 257 258 259 #include "gt-cp-cp-lang.h" 260 #include "gtype-cp.h" 261