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111
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1 /* Declarations and definitions dealing with attribute handling.
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2 Copyright (C) 2013-2017 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 #ifndef GCC_ATTRIBS_H
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21 #define GCC_ATTRIBS_H
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22
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23 extern const struct attribute_spec *lookup_attribute_spec (const_tree);
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24 extern void init_attributes (void);
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25
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26 /* Process the attributes listed in ATTRIBUTES and install them in *NODE,
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27 which is either a DECL (including a TYPE_DECL) or a TYPE. If a DECL,
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28 it should be modified in place; if a TYPE, a copy should be created
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29 unless ATTR_FLAG_TYPE_IN_PLACE is set in FLAGS. FLAGS gives further
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30 information, in the form of a bitwise OR of flags in enum attribute_flags
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31 from tree.h. Depending on these flags, some attributes may be
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32 returned to be applied at a later stage (for example, to apply
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33 a decl attribute to the declaration rather than to its type). */
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34 extern tree decl_attributes (tree *, tree, int);
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35
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36 extern bool cxx11_attribute_p (const_tree);
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37 extern tree get_attribute_name (const_tree);
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38 extern void apply_tm_attr (tree, tree);
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39 extern tree make_attribute (const char *, const char *, tree);
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40
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41 extern struct scoped_attributes* register_scoped_attributes (const struct attribute_spec *,
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42 const char *);
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43
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44 extern char *sorted_attr_string (tree);
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45 extern bool common_function_versions (tree, tree);
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46 extern char *make_unique_name (tree, const char *, bool);
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47 extern tree make_dispatcher_decl (const tree);
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48 extern bool is_function_default_version (const tree);
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49
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50 /* Return a type like TTYPE except that its TYPE_ATTRIBUTES
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51 is ATTRIBUTE.
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52
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53 Such modified types already made are recorded so that duplicates
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54 are not made. */
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55
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56 extern tree build_type_attribute_variant (tree, tree);
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57 extern tree build_decl_attribute_variant (tree, tree);
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58 extern tree build_type_attribute_qual_variant (tree, tree, int);
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59
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60 extern bool attribute_value_equal (const_tree, const_tree);
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61
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62 /* Return 0 if the attributes for two types are incompatible, 1 if they
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63 are compatible, and 2 if they are nearly compatible (which causes a
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64 warning to be generated). */
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65 extern int comp_type_attributes (const_tree, const_tree);
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66
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67 /* Default versions of target-overridable functions. */
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68 extern tree merge_decl_attributes (tree, tree);
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69 extern tree merge_type_attributes (tree, tree);
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70
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71 /* Remove any instances of attribute ATTR_NAME in LIST and return the
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72 modified list. */
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73
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74 extern tree remove_attribute (const char *, tree);
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75
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76 /* Given two attributes lists, return a list of their union. */
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77
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78 extern tree merge_attributes (tree, tree);
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79
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80 /* Duplicate all attributes with name NAME in ATTR list to *ATTRS if
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81 they are missing there. */
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82
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83 extern void duplicate_one_attribute (tree *, tree, const char *);
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84
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85 /* Duplicate all attributes from user DECL to the corresponding
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86 builtin that should be propagated. */
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87
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88 extern void copy_attributes_to_builtin (tree);
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89
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90 /* Given two Windows decl attributes lists, possibly including
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91 dllimport, return a list of their union . */
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92 extern tree merge_dllimport_decl_attributes (tree, tree);
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93
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94 /* Handle a "dllimport" or "dllexport" attribute. */
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95 extern tree handle_dll_attribute (tree *, tree, tree, int, bool *);
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96
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97 extern int attribute_list_equal (const_tree, const_tree);
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98 extern int attribute_list_contained (const_tree, const_tree);
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99
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100 /* The backbone of lookup_attribute(). ATTR_LEN is the string length
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101 of ATTR_NAME, and LIST is not NULL_TREE.
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102
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103 The function is called from lookup_attribute in order to optimize
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104 for size. */
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105 extern tree private_lookup_attribute (const char *attr_name, size_t attr_len,
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106 tree list);
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107
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108 /* For a given IDENTIFIER_NODE, strip leading and trailing '_' characters
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109 so that we have a canonical form of attribute names. */
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110
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111 static inline tree
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112 canonicalize_attr_name (tree attr_name)
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113 {
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114 const size_t l = IDENTIFIER_LENGTH (attr_name);
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115 const char *s = IDENTIFIER_POINTER (attr_name);
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116
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117 if (l > 4 && s[0] == '_' && s[1] == '_' && s[l - 1] == '_' && s[l - 2] == '_')
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118 return get_identifier_with_length (s + 2, l - 4);
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119
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120 return attr_name;
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121 }
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122
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123 /* Compare attribute identifiers ATTR1 and ATTR2 with length ATTR1_LEN and
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124 ATTR2_LEN. */
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125
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126 static inline bool
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127 cmp_attribs (const char *attr1, size_t attr1_len,
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128 const char *attr2, size_t attr2_len)
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129 {
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130 return attr1_len == attr2_len && strncmp (attr1, attr2, attr1_len) == 0;
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131 }
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132
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133 /* Compare attribute identifiers ATTR1 and ATTR2. */
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134
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135 static inline bool
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136 cmp_attribs (const char *attr1, const char *attr2)
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137 {
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138 return cmp_attribs (attr1, strlen (attr1), attr2, strlen (attr2));
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139 }
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140
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141 /* Given an identifier node IDENT and a string ATTR_NAME, return true
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142 if the identifier node is a valid attribute name for the string. */
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143
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144 static inline bool
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145 is_attribute_p (const char *attr_name, const_tree ident)
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146 {
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147 return cmp_attribs (attr_name, strlen (attr_name),
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148 IDENTIFIER_POINTER (ident), IDENTIFIER_LENGTH (ident));
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149 }
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150
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151 /* Given an attribute name ATTR_NAME and a list of attributes LIST,
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152 return a pointer to the attribute's list element if the attribute
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153 is part of the list, or NULL_TREE if not found. If the attribute
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154 appears more than once, this only returns the first occurrence; the
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155 TREE_CHAIN of the return value should be passed back in if further
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156 occurrences are wanted. ATTR_NAME must be in the form 'text' (not
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157 '__text__'). */
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158
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159 static inline tree
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160 lookup_attribute (const char *attr_name, tree list)
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161 {
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162 gcc_checking_assert (attr_name[0] != '_');
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163 /* In most cases, list is NULL_TREE. */
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164 if (list == NULL_TREE)
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165 return NULL_TREE;
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166 else
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167 {
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168 size_t attr_len = strlen (attr_name);
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169 /* Do the strlen() before calling the out-of-line implementation.
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170 In most cases attr_name is a string constant, and the compiler
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171 will optimize the strlen() away. */
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172 return private_lookup_attribute (attr_name, attr_len, list);
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173 }
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174 }
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175
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176 /* Given an attribute name ATTR_NAME and a list of attributes LIST,
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177 return a pointer to the attribute's list first element if the attribute
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178 starts with ATTR_NAME. ATTR_NAME must be in the form 'text' (not
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179 '__text__'). */
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180
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181 static inline tree
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182 lookup_attribute_by_prefix (const char *attr_name, tree list)
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183 {
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184 gcc_checking_assert (attr_name[0] != '_');
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185 /* In most cases, list is NULL_TREE. */
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186 if (list == NULL_TREE)
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187 return NULL_TREE;
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188 else
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189 {
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190 size_t attr_len = strlen (attr_name);
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191 while (list)
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192 {
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193 size_t ident_len = IDENTIFIER_LENGTH (get_attribute_name (list));
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194
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195 if (attr_len > ident_len)
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196 {
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197 list = TREE_CHAIN (list);
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198 continue;
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199 }
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200
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201 const char *p = IDENTIFIER_POINTER (get_attribute_name (list));
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202 gcc_checking_assert (attr_len == 0 || p[0] != '_');
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203
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204 if (strncmp (attr_name, p, attr_len) == 0)
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205 break;
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206
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207 list = TREE_CHAIN (list);
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208 }
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209
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210 return list;
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211 }
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212 }
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213
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214 #endif // GCC_ATTRIBS_H
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