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111
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1 /* Some code common to C and ObjC front ends.
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131
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2 Copyright (C) 2001-2018 Free Software Foundation, Inc.
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111
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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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131
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30 #include "gcc-rich-location.h"
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111
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31
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32 static bool c_tree_printer (pretty_printer *, text_info *, const char *,
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131
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33 int, bool, bool, bool, bool *, const char **);
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111
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34
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35 bool
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36 c_missing_noreturn_ok_p (tree decl)
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37 {
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38 /* A missing noreturn is not ok for freestanding implementations and
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39 ok for the `main' function in hosted implementations. */
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40 return flag_hosted && MAIN_NAME_P (DECL_ASSEMBLER_NAME (decl));
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41 }
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42
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43 /* Called from check_global_declaration. */
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44
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45 bool
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46 c_warn_unused_global_decl (const_tree decl)
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47 {
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48 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl))
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49 return false;
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50 if (DECL_IN_SYSTEM_HEADER (decl))
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51 return false;
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52
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53 return true;
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54 }
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55
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56 /* Initialization common to C and Objective-C front ends. */
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57 bool
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58 c_objc_common_init (void)
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59 {
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60 c_init_decl_processing ();
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61
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62 return c_common_init ();
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63 }
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64
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131
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65 /* Print T to CPP. */
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66
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67 static void
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68 print_type (c_pretty_printer *cpp, tree t, bool *quoted)
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69 {
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70 gcc_assert (TYPE_P (t));
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71 struct obstack *ob = pp_buffer (cpp)->obstack;
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72 char *p = (char *) obstack_base (ob);
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73 /* Remember the end of the initial dump. */
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74 int len = obstack_object_size (ob);
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75
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76 tree name = TYPE_NAME (t);
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77 if (name && TREE_CODE (name) == TYPE_DECL && DECL_NAME (name))
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78 pp_identifier (cpp, lang_hooks.decl_printable_name (name, 2));
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79 else
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80 cpp->type_id (t);
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81
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82 /* If we're printing a type that involves typedefs, also print the
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83 stripped version. But sometimes the stripped version looks
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84 exactly the same, so we don't want it after all. To avoid
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85 printing it in that case, we play ugly obstack games. */
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86 if (TYPE_CANONICAL (t) && t != TYPE_CANONICAL (t))
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87 {
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88 c_pretty_printer cpp2;
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89 /* Print the stripped version into a temporary printer. */
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90 cpp2.type_id (TYPE_CANONICAL (t));
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91 struct obstack *ob2 = cpp2.buffer->obstack;
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92 /* Get the stripped version from the temporary printer. */
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93 const char *aka = (char *) obstack_base (ob2);
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94 int aka_len = obstack_object_size (ob2);
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95 int type1_len = obstack_object_size (ob) - len;
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96
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97 /* If they are identical, bail out. */
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98 if (aka_len == type1_len && memcmp (p + len, aka, aka_len) == 0)
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99 return;
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100
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101 /* They're not, print the stripped version now. */
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102 if (*quoted)
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103 pp_end_quote (cpp, pp_show_color (cpp));
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104 pp_c_whitespace (cpp);
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105 pp_left_brace (cpp);
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106 pp_c_ws_string (cpp, _("aka"));
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107 pp_c_whitespace (cpp);
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108 if (*quoted)
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109 pp_begin_quote (cpp, pp_show_color (cpp));
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110 cpp->type_id (TYPE_CANONICAL (t));
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111 if (*quoted)
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112 pp_end_quote (cpp, pp_show_color (cpp));
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113 pp_right_brace (cpp);
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114 /* No further closing quotes are needed. */
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115 *quoted = false;
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116 }
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117 }
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118
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111
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119 /* Called during diagnostic message formatting process to print a
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120 source-level entity onto BUFFER. The meaning of the format specifiers
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121 is as follows:
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122 %D: a general decl,
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123 %E: an identifier or expression,
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124 %F: a function declaration,
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131
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125 %G: a Gimple statement,
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126 %K: a CALL_EXPR,
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127 %T: a type.
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128 %V: a list of type qualifiers from a tree.
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129 %v: an explicit list of type qualifiers
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130 %#v: an explicit list of type qualifiers of a function type.
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131
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132 Please notice when called, the `%' part was already skipped by the
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133 diagnostic machinery. */
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134 static bool
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135 c_tree_printer (pretty_printer *pp, text_info *text, const char *spec,
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136 int precision, bool wide, bool set_locus, bool hash,
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131
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137 bool *quoted, const char **)
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138 {
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139 tree t = NULL_TREE;
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140 // FIXME: the next cast should be a dynamic_cast, when it is permitted.
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141 c_pretty_printer *cpp = (c_pretty_printer *) pp;
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142 pp->padding = pp_none;
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143
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144 if (precision != 0 || wide)
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145 return false;
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146
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147 if (*spec == 'G')
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148 {
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149 percent_G_format (text);
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150 return true;
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151 }
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152
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153 if (*spec == 'K')
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154 {
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155 t = va_arg (*text->args_ptr, tree);
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131
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156 percent_K_format (text, EXPR_LOCATION (t), TREE_BLOCK (t));
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157 return true;
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158 }
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159
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160 if (*spec != 'v')
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161 {
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162 t = va_arg (*text->args_ptr, tree);
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163 if (set_locus)
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131
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164 text->set_location (0, DECL_SOURCE_LOCATION (t),
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165 SHOW_RANGE_WITH_CARET);
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111
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166 }
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167
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168 switch (*spec)
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169 {
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170 case 'D':
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171 if (VAR_P (t) && DECL_HAS_DEBUG_EXPR_P (t))
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172 {
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173 t = DECL_DEBUG_EXPR (t);
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174 if (!DECL_P (t))
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175 {
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176 cpp->expression (t);
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177 return true;
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178 }
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179 }
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180 /* FALLTHRU */
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181
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182 case 'F':
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183 if (DECL_NAME (t))
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184 {
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185 pp_identifier (cpp, lang_hooks.decl_printable_name (t, 2));
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186 return true;
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187 }
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188 break;
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189
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190 case 'T':
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191 print_type (cpp, t, quoted);
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192 return true;
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111
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193
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194 case 'E':
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195 if (TREE_CODE (t) == IDENTIFIER_NODE)
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196 pp_identifier (cpp, IDENTIFIER_POINTER (t));
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197 else
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198 cpp->expression (t);
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199 return true;
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200
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201 case 'V':
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202 pp_c_type_qualifier_list (cpp, t);
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203 return true;
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204
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205 case 'v':
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206 pp_c_cv_qualifiers (cpp, va_arg (*text->args_ptr, int), hash);
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207 return true;
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208
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209 default:
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210 return false;
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211 }
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212
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213 pp_string (cpp, _("({anonymous})"));
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214 return true;
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215 }
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216
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131
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217 /* C-specific implementation of range_label::get_text () vfunc for
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218 range_label_for_type_mismatch. */
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219
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220 label_text
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221 range_label_for_type_mismatch::get_text (unsigned /*range_idx*/) const
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222 {
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223 if (m_labelled_type == NULL_TREE)
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224 return label_text (NULL, false);
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225
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226 c_pretty_printer cpp;
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227 bool quoted = false;
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228 print_type (&cpp, m_labelled_type, "ed);
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229 return label_text (xstrdup (pp_formatted_text (&cpp)), true);
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230 }
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231
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232
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233 /* In C and ObjC, all decls have "C" linkage. */
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234 bool
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235 has_c_linkage (const_tree decl ATTRIBUTE_UNUSED)
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236 {
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237 return true;
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238 }
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239
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240 void
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241 c_initialize_diagnostics (diagnostic_context *context)
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242 {
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243 pretty_printer *base = context->printer;
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244 c_pretty_printer *pp = XNEW (c_pretty_printer);
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245 context->printer = new (pp) c_pretty_printer ();
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246
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247 /* It is safe to free this object because it was previously XNEW()'d. */
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248 base->~pretty_printer ();
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249 XDELETE (base);
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250
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251 c_common_diagnostics_set_defaults (context);
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252 diagnostic_format_decoder (context) = &c_tree_printer;
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253 }
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254
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255 int
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256 c_types_compatible_p (tree x, tree y)
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257 {
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258 return comptypes (TYPE_MAIN_VARIANT (x), TYPE_MAIN_VARIANT (y));
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259 }
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260
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261 /* Determine if the type is a vla type for the backend. */
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262
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263 bool
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264 c_vla_unspec_p (tree x, tree fn ATTRIBUTE_UNUSED)
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265 {
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266 return c_vla_type_p (x);
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267 }
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