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1 /* Some code common to C and ObjC front ends.
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2 Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007 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 "tm.h"
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24 #include "tree.h"
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25 #include "rtl.h"
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26 #include "insn-config.h"
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27 #include "integrate.h"
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28 #include "c-tree.h"
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29 #include "c-pretty-print.h"
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30 #include "function.h"
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31 #include "flags.h"
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32 #include "toplev.h"
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33 #include "diagnostic.h"
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34 #include "tree-inline.h"
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35 #include "varray.h"
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36 #include "ggc.h"
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37 #include "langhooks.h"
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38 #include "tree-mudflap.h"
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39 #include "target.h"
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40 #include "c-objc-common.h"
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41
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42 static bool c_tree_printer (pretty_printer *, text_info *, const char *,
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43 int, bool, bool, bool);
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44
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45 bool
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46 c_missing_noreturn_ok_p (tree decl)
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47 {
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48 /* A missing noreturn is not ok for freestanding implementations and
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49 ok for the `main' function in hosted implementations. */
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50 return flag_hosted && MAIN_NAME_P (DECL_ASSEMBLER_NAME (decl));
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51 }
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52
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53 /* Called from check_global_declarations. */
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54
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55 bool
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56 c_warn_unused_global_decl (const_tree decl)
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57 {
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58 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_DECLARED_INLINE_P (decl))
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59 return false;
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60 if (DECL_IN_SYSTEM_HEADER (decl))
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61 return false;
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62
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63 return true;
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64 }
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65
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66 /* Initialization common to C and Objective-C front ends. */
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67 bool
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68 c_objc_common_init (void)
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69 {
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70 c_init_decl_processing ();
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71
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72 if (c_common_init () == false)
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73 return false;
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74
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75 /* These were not defined in the Objective-C front end, but I'm
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76 putting them here anyway. The diagnostic format decoder might
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77 want an enhanced ObjC implementation. */
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78 diagnostic_format_decoder (global_dc) = &c_tree_printer;
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79
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80 return true;
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81 }
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82
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83 /* Called during diagnostic message formatting process to print a
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84 source-level entity onto BUFFER. The meaning of the format specifiers
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85 is as follows:
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86 %D: a general decl,
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87 %E: an identifier or expression,
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88 %F: a function declaration,
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89 %T: a type.
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90
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91 These format specifiers form a subset of the format specifiers set used
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92 by the C++ front-end.
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93 Please notice when called, the `%' part was already skipped by the
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94 diagnostic machinery. */
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95 static bool
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96 c_tree_printer (pretty_printer *pp, text_info *text, const char *spec,
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97 int precision, bool wide, bool set_locus, bool hash)
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98 {
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99 tree t = va_arg (*text->args_ptr, tree);
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100 tree name;
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101 const char *n = "({anonymous})";
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102 c_pretty_printer *cpp = (c_pretty_printer *) pp;
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103 pp->padding = pp_none;
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104
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105 if (precision != 0 || wide || hash)
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106 return false;
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107
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108 if (set_locus && text->locus)
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109 *text->locus = DECL_SOURCE_LOCATION (t);
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110
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111 switch (*spec)
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112 {
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113 case 'D':
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114 if (DECL_DEBUG_EXPR_IS_FROM (t) && DECL_DEBUG_EXPR (t))
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115 {
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116 t = DECL_DEBUG_EXPR (t);
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117 if (!DECL_P (t))
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118 {
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119 pp_c_expression (cpp, t);
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120 return true;
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121 }
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122 }
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123 /* FALLTHRU */
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124
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125 case 'F':
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126 if (DECL_NAME (t))
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127 n = lang_hooks.decl_printable_name (t, 2);
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128 break;
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129
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130 case 'T':
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131 gcc_assert (TYPE_P (t));
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132 name = TYPE_NAME (t);
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133
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134 if (name && TREE_CODE (name) == TYPE_DECL)
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135 {
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136 if (DECL_NAME (name))
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137 pp_string (cpp, lang_hooks.decl_printable_name (name, 2));
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138 else
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139 pp_type_id (cpp, t);
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140 return true;
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141 }
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142 else
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143 {
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144 pp_type_id (cpp, t);
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145 return true;
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146 }
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147 break;
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148
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149 case 'E':
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150 if (TREE_CODE (t) == IDENTIFIER_NODE)
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151 n = IDENTIFIER_POINTER (t);
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152 else
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153 {
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154 pp_expression (cpp, t);
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155 return true;
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156 }
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157 break;
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158
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159 default:
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160 return false;
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161 }
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162
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163 pp_string (cpp, n);
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164 return true;
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165 }
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166
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167 /* In C and ObjC, all decls have "C" linkage. */
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168 bool
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169 has_c_linkage (const_tree decl ATTRIBUTE_UNUSED)
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170 {
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171 return true;
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172 }
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173
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174 void
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175 c_initialize_diagnostics (diagnostic_context *context)
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176 {
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177 pretty_printer *base = context->printer;
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178 c_pretty_printer *pp = XNEW (c_pretty_printer);
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179 memcpy (pp_base (pp), base, sizeof (pretty_printer));
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180 pp_c_pretty_printer_init (pp);
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181 context->printer = (pretty_printer *) pp;
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182
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183 /* It is safe to free this object because it was previously XNEW()'d. */
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184 XDELETE (base);
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185 }
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186
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187 int
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188 c_types_compatible_p (tree x, tree y)
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189 {
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190 return comptypes (TYPE_MAIN_VARIANT (x), TYPE_MAIN_VARIANT (y));
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191 }
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192
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193 /* Determine if the type is a vla type for the backend. */
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194
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195 bool
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196 c_vla_unspec_p (tree x, tree fn ATTRIBUTE_UNUSED)
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197 {
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198 return c_vla_type_p (x);
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199 }
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