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111
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1 /* Some code common to C and ObjC front ends.
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2 Copyright (C) 2001-2017 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #include "config.h"
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21 #include "system.h"
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22 #include "coretypes.h"
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23 #include "c-tree.h"
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24 #include "intl.h"
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25 #include "c-family/c-pretty-print.h"
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26 #include "tree-pretty-print.h"
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27 #include "gimple-pretty-print.h"
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28 #include "langhooks.h"
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29 #include "c-objc-common.h"
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30
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31 static bool c_tree_printer (pretty_printer *, text_info *, const char *,
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32 int, bool, bool, bool, bool, const char **);
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33
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34 bool
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35 c_missing_noreturn_ok_p (tree decl)
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36 {
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37 /* A missing noreturn is not ok for freestanding implementations and
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38 ok for the `main' function in hosted implementations. */
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39 return flag_hosted && MAIN_NAME_P (DECL_ASSEMBLER_NAME (decl));
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40 }
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41
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42 /* Called from check_global_declaration. */
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43
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44 bool
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45 c_warn_unused_global_decl (const_tree decl)
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46 {
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47 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl))
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48 return false;
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49 if (DECL_IN_SYSTEM_HEADER (decl))
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50 return false;
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51
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52 return true;
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53 }
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54
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55 /* Initialization common to C and Objective-C front ends. */
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56 bool
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57 c_objc_common_init (void)
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58 {
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59 c_init_decl_processing ();
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60
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61 return c_common_init ();
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62 }
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63
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64 /* Called during diagnostic message formatting process to print a
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65 source-level entity onto BUFFER. The meaning of the format specifiers
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66 is as follows:
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67 %D: a general decl,
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68 %E: an identifier or expression,
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69 %F: a function declaration,
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70 %G: a Gimple call statement,
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71 %K: a CALL_EXPR,
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72 %T: a type.
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73 %V: a list of type qualifiers from a tree.
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74 %v: an explicit list of type qualifiers
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75 %#v: an explicit list of type qualifiers of a function type.
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76
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77 Please notice when called, the `%' part was already skipped by the
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78 diagnostic machinery. */
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79 static bool
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80 c_tree_printer (pretty_printer *pp, text_info *text, const char *spec,
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81 int precision, bool wide, bool set_locus, bool hash,
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82 bool, const char **)
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83 {
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84 tree t = NULL_TREE;
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85 tree name;
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86 // FIXME: the next cast should be a dynamic_cast, when it is permitted.
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87 c_pretty_printer *cpp = (c_pretty_printer *) pp;
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88 pp->padding = pp_none;
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89
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90 if (precision != 0 || wide)
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91 return false;
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92
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93 if (*spec == 'G')
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94 {
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95 percent_G_format (text);
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96 return true;
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97 }
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98
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99 if (*spec == 'K')
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100 {
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101 t = va_arg (*text->args_ptr, tree);
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102 percent_K_format (text, t);
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103 return true;
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104 }
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105
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106 if (*spec != 'v')
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107 {
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108 t = va_arg (*text->args_ptr, tree);
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109 if (set_locus)
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110 text->set_location (0, DECL_SOURCE_LOCATION (t), true);
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111 }
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112
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113 switch (*spec)
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114 {
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115 case 'D':
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116 if (VAR_P (t) && DECL_HAS_DEBUG_EXPR_P (t))
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117 {
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118 t = DECL_DEBUG_EXPR (t);
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119 if (!DECL_P (t))
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120 {
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121 cpp->expression (t);
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122 return true;
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123 }
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124 }
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125 /* FALLTHRU */
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126
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127 case 'F':
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128 if (DECL_NAME (t))
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129 {
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130 pp_identifier (cpp, lang_hooks.decl_printable_name (t, 2));
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131 return true;
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132 }
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133 break;
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134
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135 case 'T':
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136 {
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137 gcc_assert (TYPE_P (t));
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138 struct obstack *ob = pp_buffer (cpp)->obstack;
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139 char *p = (char *) obstack_base (ob);
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140 /* Remember the end of the initial dump. */
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141 int len = obstack_object_size (ob);
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142
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143 name = TYPE_NAME (t);
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144 if (name && TREE_CODE (name) == TYPE_DECL && DECL_NAME (name))
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145 pp_identifier (cpp, lang_hooks.decl_printable_name (name, 2));
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146 else
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147 cpp->type_id (t);
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148
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149 /* If we're printing a type that involves typedefs, also print the
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150 stripped version. But sometimes the stripped version looks
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151 exactly the same, so we don't want it after all. To avoid
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152 printing it in that case, we play ugly obstack games. */
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153 if (TYPE_CANONICAL (t) && t != TYPE_CANONICAL (t))
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154 {
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155 c_pretty_printer cpp2;
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156 /* Print the stripped version into a temporary printer. */
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157 cpp2.type_id (TYPE_CANONICAL (t));
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158 struct obstack *ob2 = cpp2.buffer->obstack;
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159 /* Get the stripped version from the temporary printer. */
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160 const char *aka = (char *) obstack_base (ob2);
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161 int aka_len = obstack_object_size (ob2);
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162 int type1_len = obstack_object_size (ob) - len;
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163
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164 /* If they are identical, bail out. */
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165 if (aka_len == type1_len && memcmp (p + len, aka, aka_len) == 0)
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166 return true;
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167
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168 /* They're not, print the stripped version now. */
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169 pp_c_whitespace (cpp);
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170 pp_left_brace (cpp);
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171 pp_c_ws_string (cpp, _("aka"));
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172 pp_c_whitespace (cpp);
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173 cpp->type_id (TYPE_CANONICAL (t));
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174 pp_right_brace (cpp);
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175 }
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176 return true;
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177 }
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178
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179 case 'E':
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180 if (TREE_CODE (t) == IDENTIFIER_NODE)
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181 pp_identifier (cpp, IDENTIFIER_POINTER (t));
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182 else
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183 cpp->expression (t);
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184 return true;
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185
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186 case 'V':
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187 pp_c_type_qualifier_list (cpp, t);
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188 return true;
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189
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190 case 'v':
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191 pp_c_cv_qualifiers (cpp, va_arg (*text->args_ptr, int), hash);
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192 return true;
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193
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194 default:
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195 return false;
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196 }
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197
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198 pp_string (cpp, _("({anonymous})"));
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199 return true;
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200 }
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201
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202 /* In C and ObjC, all decls have "C" linkage. */
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203 bool
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204 has_c_linkage (const_tree decl ATTRIBUTE_UNUSED)
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205 {
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206 return true;
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207 }
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208
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209 void
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210 c_initialize_diagnostics (diagnostic_context *context)
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211 {
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212 pretty_printer *base = context->printer;
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213 c_pretty_printer *pp = XNEW (c_pretty_printer);
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214 context->printer = new (pp) c_pretty_printer ();
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215
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216 /* It is safe to free this object because it was previously XNEW()'d. */
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217 base->~pretty_printer ();
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218 XDELETE (base);
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219
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220 c_common_diagnostics_set_defaults (context);
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221 diagnostic_format_decoder (context) = &c_tree_printer;
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222 }
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223
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224 int
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225 c_types_compatible_p (tree x, tree y)
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226 {
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227 return comptypes (TYPE_MAIN_VARIANT (x), TYPE_MAIN_VARIANT (y));
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228 }
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229
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230 /* Determine if the type is a vla type for the backend. */
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231
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232 bool
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233 c_vla_unspec_p (tree x, tree fn ATTRIBUTE_UNUSED)
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234 {
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235 return c_vla_type_p (x);
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236 }
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