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111
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1 /* Language-dependent hooks for C++.
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2 Copyright (C) 2001-2017 Free Software Foundation, Inc.
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3 Contributed by Alexandre Oliva <aoliva@redhat.com>
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify
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8 it under the terms of the GNU General Public License as published by
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9 the Free Software Foundation; either version 3, or (at your option)
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10 any later version.
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11
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12 GCC is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with GCC; see the file COPYING3. If not see
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19 <http://www.gnu.org/licenses/>. */
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20
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21 #include "config.h"
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22 #include "system.h"
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23 #include "coretypes.h"
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24 #include "cp-tree.h"
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25 #include "stor-layout.h"
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26 #include "langhooks.h"
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27 #include "langhooks-def.h"
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28 #include "cp-objcp-common.h"
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29
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30 enum c_language_kind c_language = clk_cxx;
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31 static void cp_init_ts (void);
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32 static const char * cxx_dwarf_name (tree t, int verbosity);
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33 static enum classify_record cp_classify_record (tree type);
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34 static tree cp_eh_personality (void);
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35 static tree get_template_innermost_arguments_folded (const_tree);
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36 static tree get_template_argument_pack_elems_folded (const_tree);
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37 static tree cxx_enum_underlying_base_type (const_tree);
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38
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39 /* Lang hooks common to C++ and ObjC++ are declared in cp/cp-objcp-common.h;
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40 consequently, there should be very few hooks below. */
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41
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42 #undef LANG_HOOKS_NAME
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43 #define LANG_HOOKS_NAME "GNU C++"
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44 #undef LANG_HOOKS_INIT
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45 #define LANG_HOOKS_INIT cxx_init
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46 #undef LANG_HOOKS_CLASSIFY_RECORD
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47 #define LANG_HOOKS_CLASSIFY_RECORD cp_classify_record
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48 #undef LANG_HOOKS_GENERIC_TYPE_P
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49 #define LANG_HOOKS_GENERIC_TYPE_P class_tmpl_impl_spec_p
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50
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51 #undef LANG_HOOKS_GET_INNERMOST_GENERIC_PARMS
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52 #define LANG_HOOKS_GET_INNERMOST_GENERIC_PARMS \
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53 get_primary_template_innermost_parameters
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54 #undef LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS
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55 #define LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS \
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56 get_template_innermost_arguments_folded
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57 #undef LANG_HOOKS_FUNCTION_PARAMETER_PACK_P
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58 #define LANG_HOOKS_FUNCTION_PARAMETER_PACK_P \
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59 function_parameter_pack_p
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60 #undef LANG_HOOKS_GET_ARGUMENT_PACK_ELEMS
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61 #define LANG_HOOKS_GET_ARGUMENT_PACK_ELEMS \
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62 get_template_argument_pack_elems_folded
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63 #undef LANG_HOOKS_GENERIC_GENERIC_PARAMETER_DECL_P
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64 #define LANG_HOOKS_GENERIC_GENERIC_PARAMETER_DECL_P \
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65 template_template_parameter_p
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66 #undef LANG_HOOKS_FUNCTION_PARM_EXPANDED_FROM_PACK_P
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67 #define LANG_HOOKS_FUNCTION_PARM_EXPANDED_FROM_PACK_P \
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68 function_parameter_expanded_from_pack_p
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69 #undef LANG_HOOKS_GET_GENERIC_FUNCTION_DECL
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70 #define LANG_HOOKS_GET_GENERIC_FUNCTION_DECL get_function_template_decl
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71 #undef LANG_HOOKS_DWARF_NAME
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72 #define LANG_HOOKS_DWARF_NAME cxx_dwarf_name
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73 #undef LANG_HOOKS_INIT_TS
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74 #define LANG_HOOKS_INIT_TS cp_init_ts
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75 #undef LANG_HOOKS_EH_PERSONALITY
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76 #define LANG_HOOKS_EH_PERSONALITY cp_eh_personality
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77 #undef LANG_HOOKS_EH_RUNTIME_TYPE
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78 #define LANG_HOOKS_EH_RUNTIME_TYPE build_eh_type_type
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79 #undef LANG_HOOKS_ENUM_UNDERLYING_BASE_TYPE
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80 #define LANG_HOOKS_ENUM_UNDERLYING_BASE_TYPE cxx_enum_underlying_base_type
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81
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82 #if CHECKING_P
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83 #undef LANG_HOOKS_RUN_LANG_SELFTESTS
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84 #define LANG_HOOKS_RUN_LANG_SELFTESTS selftest::run_cp_tests
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85 #endif /* #if CHECKING_P */
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86
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87 /* Each front end provides its own lang hook initializer. */
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88 struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;
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89
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90 /* Lang hook routines common to C++ and ObjC++ appear in cp/cp-objcp-common.c;
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91 there should be very few routines below. */
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92
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93 /* The following function does something real, but only in Objective-C++. */
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94
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95 tree
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96 objcp_tsubst_copy_and_build (tree /*t*/,
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97 tree /*args*/,
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98 tsubst_flags_t /*complain*/,
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99 tree /*in_decl*/,
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100 bool /*function_p*/)
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101 {
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102 return NULL_TREE;
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103 }
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104
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105 static void
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106 cp_init_ts (void)
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107 {
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108 cp_common_init_ts ();
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109
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110 init_shadowed_var_for_decl ();
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111 }
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112
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113 static const char *
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114 cxx_dwarf_name (tree t, int verbosity)
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115 {
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116 gcc_assert (DECL_P (t));
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117
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118 if (DECL_NAME (t)
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119 && (anon_aggrname_p (DECL_NAME (t)) || LAMBDA_TYPE_P (t)))
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120 return NULL;
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121 if (verbosity >= 2)
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122 return decl_as_dwarf_string (t,
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123 TFF_DECL_SPECIFIERS | TFF_UNQUALIFIED_NAME
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124 | TFF_NO_OMIT_DEFAULT_TEMPLATE_ARGUMENTS);
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125
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126 return lang_decl_dwarf_name (t, verbosity, false);
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127 }
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128
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129 static enum classify_record
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130 cp_classify_record (tree type)
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131 {
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132 if (TYPE_LANG_SPECIFIC (type)
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133 && CLASSTYPE_DECLARED_CLASS (type))
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134 return RECORD_IS_CLASS;
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135
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136 return RECORD_IS_STRUCT;
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137 }
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138
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139 static GTY(()) tree cp_eh_personality_decl;
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140
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141 static tree
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142 cp_eh_personality (void)
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143 {
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144 if (!cp_eh_personality_decl)
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145 cp_eh_personality_decl = build_personality_function ("gxx");
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146
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147 return cp_eh_personality_decl;
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148 }
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149
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150 /* This is a subroutine of fold_cplus_constants. It returns TRUE if T
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151 is a C++ specific constant that needs to be folded further before
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152 being passed to the debug info emitter. */
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153
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154 static bool
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155 template_arg_needs_folding (const_tree t)
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156 {
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157 /* For now only PTRMEM_CST nodes are to be folded further. */
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158 if (TREE_CODE (t) == PTRMEM_CST)
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159 return true;
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160 return false;
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161 }
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162
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163 /* Fold the elements of the TREE_VEC C which are C++ specific nodes
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164 that would need folding so that they can be processed by the debug
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165 info emitter. This is a subroutine of
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166 get_template_innermost_arguments_folded and
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167 get_template_argument_pack_elems_folded. */
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168
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169 static tree
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170 fold_cplus_constants (const_tree c)
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171 {
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172 tree folded_elems, elems = CONST_CAST_TREE (c);
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173 int vec_len, i;
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174
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175 if (elems == NULL_TREE || elems == error_mark_node)
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176 return elems;
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177
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178 vec_len = TREE_VEC_LENGTH (elems);
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179
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180 /* First check if there is at least one element that needs
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181 folding. If there is none, we just return ELEMS. Otherwise create
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182 and return a new tree vector that contains the folded versions of
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183 ELEMS. This is to avoid allocating memory if we don't need
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184 to. */
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185 for (i = 0; i < vec_len; ++i)
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186 {
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187 if (template_arg_needs_folding (TREE_VEC_ELT (elems, i)))
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188 break;
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189 }
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190 if (i == vec_len)
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191 return elems;
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192
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193 folded_elems = make_tree_vec (vec_len);
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194 for (i = 0; i < vec_len; ++i)
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195 {
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196 tree elem = TREE_VEC_ELT (elems, i);
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197 TREE_VEC_ELT (folded_elems, i) =
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198 (elem && !TYPE_P (elem)) ? cplus_expand_constant (elem) : elem;
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199
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200 }
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201 return folded_elems;
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202 }
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203
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204 /* The C++ implementation of the LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS
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205 hook. It returns the innermost template arguments of type T, and
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206 makes sure those arguments are folded enough for the debug info
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207 emitter. */
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208
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209 static tree
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210 get_template_innermost_arguments_folded (const_tree t)
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211 {
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212 return fold_cplus_constants (get_template_innermost_arguments (t));
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213 }
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214
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215 static tree
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216 get_template_argument_pack_elems_folded (const_tree t)
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217 {
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218 return fold_cplus_constants (get_template_argument_pack_elems (t));
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219 }
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220
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221 /* The C++ version of the enum_underlying_base_type langhook.
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222 See also cp/semantics.c (finish_underlying_type). */
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223
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224 static
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225 tree cxx_enum_underlying_base_type (const_tree type)
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226 {
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227 tree underlying_type = ENUM_UNDERLYING_TYPE (type);
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228
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229 if (! ENUM_FIXED_UNDERLYING_TYPE_P (type))
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230 underlying_type
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231 = c_common_type_for_mode (TYPE_MODE (underlying_type),
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232 TYPE_UNSIGNED (underlying_type));
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233
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234 return underlying_type;
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235 }
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236
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237 #if CHECKING_P
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238
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239 namespace selftest {
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240
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241 /* Implementation of LANG_HOOKS_RUN_LANG_SELFTESTS for the C++ frontend. */
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242
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243 void
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244 run_cp_tests (void)
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245 {
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246 /* Run selftests shared within the C family. */
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247 c_family_tests ();
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248
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249 /* Additional C++-specific tests. */
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250 }
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251
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252 } // namespace selftest
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253
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254 #endif /* #if CHECKING_P */
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255
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256
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257 #include "gt-cp-cp-lang.h"
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258 #include "gtype-cp.h"
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