1 | /* Definitions for C parsing and type checking. |
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2 | Copyright (C) 1987, 1993, 1994, 1995, 1997 Free Software Foundation, Inc. |
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3 | |
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4 | This file is part of GNU CC. |
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5 | |
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6 | GNU CC is free software; you can redistribute it and/or modify |
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7 | it under the terms of the GNU General Public License as published by |
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8 | the Free Software Foundation; either version 2, or (at your option) |
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9 | any later version. |
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10 | |
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11 | GNU CC is distributed in the hope that it will be useful, |
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12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | GNU General Public License 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 GNU CC; see the file COPYING. If not, write to |
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18 | the Free Software Foundation, 59 Temple Place - Suite 330, |
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19 | Boston, MA 02111-1307, USA. */ |
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20 | |
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21 | #ifndef _C_TREE_H |
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22 | #define _C_TREE_H |
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23 | |
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24 | /* Language-dependent contents of an identifier. */ |
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25 | |
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26 | /* The limbo_value is used for block level extern declarations, which need |
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27 | to be type checked against subsequent extern declarations. They can't |
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28 | be referenced after they fall out of scope, so they can't be global. */ |
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29 | |
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30 | struct lang_identifier |
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31 | { |
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32 | struct tree_identifier ignore; |
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33 | tree global_value, local_value, label_value, implicit_decl; |
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34 | tree error_locus, limbo_value; |
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35 | }; |
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36 | |
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37 | /* Macros for access to language-specific slots in an identifier. */ |
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38 | /* Each of these slots contains a DECL node or null. */ |
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39 | |
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40 | /* This represents the value which the identifier has in the |
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41 | file-scope namespace. */ |
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42 | #define IDENTIFIER_GLOBAL_VALUE(NODE) \ |
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43 | (((struct lang_identifier *) (NODE))->global_value) |
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44 | /* This represents the value which the identifier has in the current |
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45 | scope. */ |
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46 | #define IDENTIFIER_LOCAL_VALUE(NODE) \ |
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47 | (((struct lang_identifier *) (NODE))->local_value) |
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48 | /* This represents the value which the identifier has as a label in |
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49 | the current label scope. */ |
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50 | #define IDENTIFIER_LABEL_VALUE(NODE) \ |
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51 | (((struct lang_identifier *) (NODE))->label_value) |
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52 | /* This records the extern decl of this identifier, if it has had one |
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53 | at any point in this compilation. */ |
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54 | #define IDENTIFIER_LIMBO_VALUE(NODE) \ |
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55 | (((struct lang_identifier *) (NODE))->limbo_value) |
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56 | /* This records the implicit function decl of this identifier, if it |
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57 | has had one at any point in this compilation. */ |
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58 | #define IDENTIFIER_IMPLICIT_DECL(NODE) \ |
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59 | (((struct lang_identifier *) (NODE))->implicit_decl) |
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60 | /* This is the last function in which we printed an "undefined variable" |
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61 | message for this identifier. Value is a FUNCTION_DECL or null. */ |
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62 | #define IDENTIFIER_ERROR_LOCUS(NODE) \ |
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63 | (((struct lang_identifier *) (NODE))->error_locus) |
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64 | |
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65 | /* In identifiers, C uses the following fields in a special way: |
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66 | TREE_PUBLIC to record that there was a previous local extern decl. |
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67 | TREE_USED to record that such a decl was used. |
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68 | TREE_ADDRESSABLE to record that the address of such a decl was used. */ |
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69 | |
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70 | /* Nonzero means reject anything that ANSI standard C forbids. */ |
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71 | extern int pedantic; |
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72 | |
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73 | /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is read-only. */ |
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74 | #define C_TYPE_FIELDS_READONLY(type) TREE_LANG_FLAG_1 (type) |
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75 | |
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76 | /* In a RECORD_TYPE or UNION_TYPE, nonzero if any component is volatile. */ |
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77 | #define C_TYPE_FIELDS_VOLATILE(type) TREE_LANG_FLAG_2 (type) |
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78 | |
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79 | /* In a RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE |
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80 | nonzero if the definition of the type has already started. */ |
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81 | #define C_TYPE_BEING_DEFINED(type) TYPE_LANG_FLAG_0 (type) |
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82 | |
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83 | /* In a RECORD_TYPE, a sorted array of the fields of the type. */ |
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84 | struct lang_type |
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85 | { |
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86 | int len; |
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87 | tree elts[1]; |
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88 | }; |
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89 | |
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90 | /* Mark which labels are explicitly declared. |
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91 | These may be shadowed, and may be referenced from nested functions. */ |
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92 | #define C_DECLARED_LABEL_FLAG(label) TREE_LANG_FLAG_1 (label) |
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93 | |
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94 | /* Record whether a type or decl was written with nonconstant size. |
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95 | Note that TYPE_SIZE may have simplified to a constant. */ |
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96 | #define C_TYPE_VARIABLE_SIZE(type) TYPE_LANG_FLAG_1 (type) |
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97 | #define C_DECL_VARIABLE_SIZE(type) DECL_LANG_FLAG_0 (type) |
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98 | |
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99 | /* Record in each node resulting from a binary operator |
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100 | what operator was specified for it. */ |
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101 | #define C_EXP_ORIGINAL_CODE(exp) ((enum tree_code) TREE_COMPLEXITY (exp)) |
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102 | |
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103 | #if 0 /* Not used. */ |
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104 | /* Record whether a decl for a function or function pointer has |
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105 | already been mentioned (in a warning) because it was called |
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106 | but didn't have a prototype. */ |
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107 | #define C_MISSING_PROTOTYPE_WARNED(decl) DECL_LANG_FLAG_2(decl) |
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108 | #endif |
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109 | |
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110 | /* Store a value in that field. */ |
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111 | #define C_SET_EXP_ORIGINAL_CODE(exp, code) \ |
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112 | (TREE_COMPLEXITY (exp) = (int) (code)) |
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113 | |
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114 | /* Record whether a typedef for type `int' was actually `signed int'. */ |
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115 | #define C_TYPEDEF_EXPLICITLY_SIGNED(exp) DECL_LANG_FLAG_1 ((exp)) |
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116 | |
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117 | /* Nonzero for a declaration of a built in function if there has been no |
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118 | occasion that would declare the function in ordinary C. |
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119 | Using the function draws a pedantic warning in this case. */ |
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120 | #define C_DECL_ANTICIPATED(exp) DECL_LANG_FLAG_3 ((exp)) |
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121 | |
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122 | /* For FUNCTION_TYPE, a hidden list of types of arguments. The same as |
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123 | TYPE_ARG_TYPES for functions with prototypes, but created for functions |
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124 | without prototypes. */ |
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125 | #define TYPE_ACTUAL_ARG_TYPES(NODE) TYPE_NONCOPIED_PARTS (NODE) |
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126 | |
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127 | /* In a FIELD_DECL, nonzero if the decl was originally a bitfield. */ |
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128 | #define DECL_C_BIT_FIELD(NODE) DECL_LANG_FLAG_4 (NODE) |
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129 | |
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130 | /* Nonzero if the type T promotes to itself. |
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131 | ANSI C states explicitly the list of types that promote; |
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132 | in particular, short promotes to int even if they have the same width. */ |
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133 | #define C_PROMOTING_INTEGER_TYPE_P(t) \ |
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134 | (TREE_CODE ((t)) == INTEGER_TYPE \ |
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135 | && (TYPE_MAIN_VARIANT (t) == char_type_node \ |
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136 | || TYPE_MAIN_VARIANT (t) == signed_char_type_node \ |
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137 | || TYPE_MAIN_VARIANT (t) == unsigned_char_type_node \ |
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138 | || TYPE_MAIN_VARIANT (t) == short_integer_type_node \ |
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139 | || TYPE_MAIN_VARIANT (t) == short_unsigned_type_node)) |
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140 | |
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141 | /* In a VAR_DECL, means the variable is really an iterator. */ |
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142 | #define ITERATOR_P(D) (DECL_LANG_FLAG_4(D)) |
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143 | |
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144 | /* In a VAR_DECL for an iterator, means we are within |
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145 | an explicit loop over that iterator. */ |
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146 | #define ITERATOR_BOUND_P(NODE) ((NODE)->common.readonly_flag) |
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147 | |
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148 | /* in c-lang.c and objc-act.c */ |
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149 | extern tree lookup_interface PROTO((tree)); |
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150 | extern tree is_class_name PROTO((tree)); |
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151 | extern void maybe_objc_check_decl PROTO((tree)); |
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152 | extern int maybe_objc_comptypes PROTO((tree, tree, int)); |
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153 | extern tree maybe_building_objc_message_expr PROTO((void)); |
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154 | extern tree maybe_objc_method_name PROTO((tree)); |
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155 | extern int recognize_objc_keyword PROTO((void)); |
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156 | extern tree build_objc_string PROTO((int, char *)); |
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157 | |
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158 | /* in c-aux-info.c */ |
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159 | extern void gen_aux_info_record PROTO((tree, int, int, int)); |
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160 | |
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161 | /* in c-common.c */ |
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162 | extern void declare_function_name PROTO((void)); |
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163 | extern void decl_attributes PROTO((tree, tree, tree)); |
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164 | extern void init_function_format_info PROTO((void)); |
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165 | extern void record_function_format PROTO((tree, tree, int, int, int)); |
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166 | extern void check_function_format PROTO((tree, tree, tree)); |
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167 | /* Print an error message for invalid operands to arith operation CODE. |
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168 | NOP_EXPR is used as a special case (see truthvalue_conversion). */ |
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169 | extern void binary_op_error PROTO((enum tree_code)); |
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170 | extern void c_expand_expr_stmt PROTO((tree)); |
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171 | /* Validate the expression after `case' and apply default promotions. */ |
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172 | extern tree check_case_value PROTO((tree)); |
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173 | /* Concatenate a list of STRING_CST nodes into one STRING_CST. */ |
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174 | extern tree combine_strings PROTO((tree)); |
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175 | extern void constant_expression_warning PROTO((tree)); |
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176 | extern tree convert_and_check PROTO((tree, tree)); |
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177 | extern void overflow_warning PROTO((tree)); |
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178 | extern void unsigned_conversion_warning PROTO((tree, tree)); |
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179 | /* Read the rest of the current #-directive line. */ |
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180 | extern char *get_directive_line PROTO((FILE *)); |
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181 | /* Subroutine of build_binary_op, used for comparison operations. |
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182 | See if the operands have both been converted from subword integer types |
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183 | and, if so, perhaps change them both back to their original type. */ |
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184 | extern tree shorten_compare PROTO((tree *, tree *, tree *, enum tree_code *)); |
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185 | /* Prepare expr to be an argument of a TRUTH_NOT_EXPR, |
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186 | or validate its data type for an `if' or `while' statement or ?..: exp. */ |
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187 | extern tree truthvalue_conversion PROTO((tree)); |
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188 | extern tree type_for_mode PROTO((enum machine_mode, int)); |
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189 | extern tree type_for_size PROTO((unsigned, int)); |
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190 | |
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191 | /* in c-convert.c */ |
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192 | extern tree convert PROTO((tree, tree)); |
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193 | |
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194 | /* in c-decl.c */ |
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195 | /* Standard named or nameless data types of the C compiler. */ |
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196 | extern tree char_array_type_node; |
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197 | extern tree char_type_node; |
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198 | extern tree const_ptr_type_node; |
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199 | extern tree const_string_type_node; |
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200 | extern tree default_function_type; |
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201 | extern tree double_ftype_double; |
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202 | extern tree double_ftype_double_double; |
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203 | extern tree double_type_node; |
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204 | extern tree float_type_node; |
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205 | extern tree intDI_type_node; |
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206 | extern tree intHI_type_node; |
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207 | extern tree intQI_type_node; |
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208 | extern tree intSI_type_node; |
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209 | extern tree int_array_type_node; |
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210 | extern tree int_ftype_cptr_cptr_sizet; |
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211 | extern tree int_ftype_int; |
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212 | extern tree int_ftype_ptr_ptr_int; |
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213 | extern tree int_ftype_string_string; |
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214 | extern tree integer_type_node; |
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215 | extern tree long_double_type_node; |
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216 | extern tree long_ftype_long; |
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217 | extern tree long_integer_type_node; |
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218 | extern tree long_long_integer_type_node; |
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219 | extern tree long_long_unsigned_type_node; |
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220 | extern tree long_unsigned_type_node; |
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221 | extern tree complex_integer_type_node; |
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222 | extern tree complex_float_type_node; |
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223 | extern tree complex_double_type_node; |
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224 | extern tree complex_long_double_type_node; |
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225 | extern tree ptr_type_node; |
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226 | extern tree ptrdiff_type_node; |
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227 | extern tree short_integer_type_node; |
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228 | extern tree short_unsigned_type_node; |
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229 | extern tree signed_char_type_node; |
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230 | extern tree signed_wchar_type_node; |
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231 | extern tree string_ftype_ptr_ptr; |
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232 | extern tree string_type_node; |
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233 | extern tree unsigned_char_type_node; |
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234 | extern tree unsigned_intDI_type_node; |
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235 | extern tree unsigned_intHI_type_node; |
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236 | extern tree unsigned_intQI_type_node; |
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237 | extern tree unsigned_intSI_type_node; |
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238 | extern tree unsigned_type_node; |
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239 | extern tree unsigned_wchar_type_node; |
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240 | extern tree void_ftype_ptr_int_int; |
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241 | extern tree void_ftype_ptr_ptr_int; |
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242 | extern tree void_type_node; |
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243 | extern tree wchar_array_type_node; |
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244 | extern tree wchar_type_node; |
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245 | extern tree boolean_type_node; |
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246 | extern tree boolean_true_node; |
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247 | extern tree boolean_false_node; |
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248 | |
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249 | extern tree build_enumerator PROTO((tree, tree)); |
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250 | /* Declare a predefined function. Return the declaration. */ |
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251 | extern tree builtin_function PROTO((char *, tree, enum built_in_function function_, char *)); |
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252 | /* Add qualifiers to a type, in the fashion for C. */ |
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253 | extern tree c_build_type_variant PROTO((tree, int, int)); |
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254 | extern int c_decode_option PROTO((char *)); |
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255 | extern void c_mark_varargs PROTO((void)); |
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256 | extern tree check_identifier PROTO((tree, tree)); |
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257 | extern void clear_parm_order PROTO((void)); |
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258 | extern tree combine_parm_decls PROTO((tree, tree, int)); |
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259 | extern int complete_array_type PROTO((tree, tree, int)); |
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260 | extern void declare_parm_level PROTO((int)); |
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261 | extern tree define_label PROTO((char *, int, tree)); |
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262 | extern void delete_block PROTO((tree)); |
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263 | extern void finish_decl PROTO((tree, tree, tree)); |
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264 | extern void finish_decl_top_level PROTO((tree, tree, tree)); |
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265 | extern tree finish_enum PROTO((tree, tree, tree)); |
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266 | extern void finish_function PROTO((int)); |
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267 | extern tree finish_struct PROTO((tree, tree, tree)); |
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268 | extern tree get_parm_info PROTO((int)); |
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269 | extern tree getdecls PROTO((void)); |
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270 | extern tree gettags PROTO((void)); |
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271 | extern int global_bindings_p PROTO((void)); |
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272 | extern tree grokfield PROTO((char *, int, tree, tree, tree)); |
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273 | extern tree groktypename PROTO((tree)); |
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274 | extern tree groktypename_in_parm_context PROTO((tree)); |
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275 | extern tree implicitly_declare PROTO((tree)); |
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276 | extern int in_parm_level_p PROTO((void)); |
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277 | extern void init_decl_processing PROTO((void)); |
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278 | extern void insert_block PROTO((tree)); |
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279 | extern void keep_next_level PROTO((void)); |
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280 | extern int kept_level_p PROTO((void)); |
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281 | extern tree lookup_label PROTO((tree)); |
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282 | extern tree lookup_name PROTO((tree)); |
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283 | extern tree lookup_name_current_level PROTO((tree)); |
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284 | extern tree lookup_name_current_level_global PROTO((tree)); |
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285 | extern tree maybe_build_cleanup PROTO((tree)); |
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286 | extern void parmlist_tags_warning PROTO((void)); |
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287 | extern void pending_xref_error PROTO((void)); |
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288 | extern void pop_c_function_context PROTO((void)); |
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289 | extern void pop_label_level PROTO((void)); |
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290 | extern tree poplevel PROTO((int, int, int)); |
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291 | extern void print_lang_decl PROTO((FILE *, tree, int)); |
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292 | extern void print_lang_identifier PROTO((FILE *, tree, int)); |
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293 | extern void print_lang_type PROTO((FILE *, tree, int)); |
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294 | extern void push_c_function_context PROTO((void)); |
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295 | extern void push_label_level PROTO((void)); |
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296 | extern void push_parm_decl PROTO((tree)); |
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297 | extern tree pushdecl PROTO((tree)); |
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298 | extern tree pushdecl_top_level PROTO((tree)); |
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299 | extern void pushlevel PROTO((int)); |
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300 | extern void pushtag PROTO((tree, tree)); |
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301 | extern void set_block PROTO((tree)); |
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302 | extern tree shadow_label PROTO((tree)); |
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303 | extern void shadow_record_fields PROTO((tree)); |
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304 | extern void shadow_tag PROTO((tree)); |
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305 | extern void shadow_tag_warned PROTO((tree, int)); |
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306 | extern tree start_enum PROTO((tree)); |
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307 | extern int start_function PROTO((tree, tree, tree, |
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308 | tree, int)); |
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309 | extern tree start_decl PROTO((tree, tree, int, |
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310 | tree, tree)); |
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311 | extern tree start_struct PROTO((enum tree_code, tree)); |
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312 | extern void store_parm_decls PROTO((void)); |
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313 | extern tree xref_tag PROTO((enum tree_code, tree)); |
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314 | |
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315 | /* in c-typeck.c */ |
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316 | extern tree require_complete_type PROTO((tree)); |
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317 | extern void incomplete_type_error PROTO((tree, tree)); |
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318 | /* Given two integer or real types, return the type for their sum. |
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319 | Given two compatible ANSI C types, returns the merged type. */ |
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320 | extern tree common_type PROTO((tree, tree)); |
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321 | extern int comptypes PROTO((tree, tree)); |
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322 | extern int self_promoting_args_p PROTO((tree)); |
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323 | extern tree c_sizeof PROTO((tree)); |
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324 | extern tree c_sizeof_nowarn PROTO((tree)); |
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325 | extern tree c_size_in_bytes PROTO((tree)); |
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326 | extern tree c_alignof PROTO((tree)); |
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327 | extern tree c_alignof_expr PROTO((tree)); |
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328 | extern tree default_conversion PROTO((tree)); |
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329 | extern tree build_component_ref PROTO((tree, tree)); |
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330 | extern tree build_indirect_ref PROTO((tree, char *)); |
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331 | extern tree build_array_ref PROTO((tree, tree)); |
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332 | extern tree build_function_call PROTO((tree, tree)); |
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333 | extern tree parser_build_binary_op PROTO((enum tree_code, |
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334 | tree, tree)); |
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335 | extern tree build_binary_op PROTO((enum tree_code, |
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336 | tree, tree, int)); |
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337 | extern tree build_unary_op PROTO((enum tree_code, |
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338 | tree, int)); |
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339 | extern int lvalue_p PROTO((tree)); |
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340 | extern int lvalue_or_else PROTO((tree, char *)); |
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341 | extern void readonly_warning PROTO((tree, char *)); |
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342 | extern int mark_addressable PROTO((tree)); |
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343 | extern tree build_conditional_expr PROTO((tree, tree, tree)); |
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344 | extern tree build_compound_expr PROTO((tree)); |
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345 | extern tree build_c_cast PROTO((tree, tree)); |
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346 | extern tree build_modify_expr PROTO((tree, enum tree_code, |
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347 | tree)); |
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348 | extern tree initializer_constant_valid_p PROTO((tree, tree)); |
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349 | extern void store_init_value PROTO((tree, tree)); |
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350 | extern void error_init PROTO((char *, char *, |
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351 | char *)); |
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352 | extern void pedwarn_init PROTO((char *, char *, |
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353 | char *)); |
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354 | extern void start_init PROTO((tree, tree, int)); |
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355 | extern void finish_init PROTO((void)); |
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356 | extern void really_start_incremental_init PROTO((tree)); |
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357 | extern void push_init_level PROTO((int)); |
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358 | extern tree pop_init_level PROTO((int)); |
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359 | extern void set_init_index PROTO((tree, tree)); |
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360 | extern void set_init_label PROTO((tree)); |
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361 | extern void process_init_element PROTO((tree)); |
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362 | extern void c_expand_asm_operands PROTO((tree, tree, tree, tree, |
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363 | int, char *, int)); |
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364 | extern void c_expand_return PROTO((tree)); |
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365 | extern tree c_expand_start_case PROTO((tree)); |
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366 | |
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367 | /* in c-iterate.c */ |
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368 | extern void iterator_expand PROTO((tree)); |
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369 | extern void iterator_for_loop_start PROTO((tree)); |
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370 | extern void iterator_for_loop_end PROTO((tree)); |
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371 | extern void iterator_for_loop_record PROTO((tree)); |
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372 | extern void push_iterator_stack PROTO((void)); |
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373 | extern void pop_iterator_stack PROTO((void)); |
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374 | |
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375 | /* Set to 0 at beginning of a function definition, set to 1 if |
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376 | a return statement that specifies a return value is seen. */ |
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377 | |
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378 | extern int current_function_returns_value; |
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379 | |
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380 | /* Set to 0 at beginning of a function definition, set to 1 if |
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381 | a return statement with no argument is seen. */ |
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382 | |
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383 | extern int current_function_returns_null; |
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384 | |
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385 | /* Nonzero means the expression being parsed will never be evaluated. |
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386 | This is a count, since unevaluated expressions can nest. */ |
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387 | |
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388 | extern int skip_evaluation; |
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389 | |
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390 | /* Nonzero means `$' can be in an identifier. */ |
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391 | |
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392 | extern int dollars_in_ident; |
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393 | |
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394 | /* Nonzero means allow type mismatches in conditional expressions; |
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395 | just make their values `void'. */ |
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396 | |
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397 | extern int flag_cond_mismatch; |
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398 | |
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399 | /* Nonzero means don't recognize the keyword `asm'. */ |
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400 | |
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401 | extern int flag_no_asm; |
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402 | |
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403 | /* Nonzero means environment is hosted (i.e., not freestanding) */ |
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404 | |
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405 | extern int flag_hosted; |
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406 | |
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407 | /* Nonzero means ignore `#ident' directives. */ |
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408 | |
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409 | extern int flag_no_ident; |
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410 | |
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411 | /* Nonzero means warn about implicit declarations. */ |
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412 | |
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413 | extern int warn_implicit; |
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414 | |
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415 | /* Nonzero means give string constants the type `const char *' |
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416 | to get extra warnings from them. These warnings will be too numerous |
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417 | to be useful, except in thoroughly ANSIfied programs. */ |
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418 | |
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419 | extern int warn_write_strings; |
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420 | |
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421 | /* Nonzero means warn about sizeof (function) or addition/subtraction |
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422 | of function pointers. */ |
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423 | |
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424 | extern int warn_pointer_arith; |
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425 | |
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426 | /* Nonzero means warn for all old-style non-prototype function decls. */ |
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427 | |
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428 | extern int warn_strict_prototypes; |
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429 | |
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430 | /* Nonzero means warn about multiple (redundant) decls for the same single |
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431 | variable or function. */ |
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432 | |
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433 | extern int warn_redundant_decls; |
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434 | |
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435 | /* Nonzero means warn about extern declarations of objects not at |
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436 | file-scope level and about *all* declarations of functions (whether |
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437 | extern or static) not at file-scope level. Note that we exclude |
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438 | implicit function declarations. To get warnings about those, use |
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439 | -Wimplicit. */ |
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440 | |
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441 | extern int warn_nested_externs; |
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442 | |
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443 | /* Nonzero means warn about pointer casts that can drop a type qualifier |
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444 | from the pointer target type. */ |
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445 | |
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446 | extern int warn_cast_qual; |
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447 | |
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448 | /* Nonzero means warn when casting a function call to a type that does |
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449 | not match the return type (e.g. (float)sqrt() or (anything*)malloc() |
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450 | when there is no previous declaration of sqrt or malloc. */ |
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451 | |
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452 | extern int warn_bad_function_cast; |
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453 | |
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454 | /* Warn about traditional constructs whose meanings changed in ANSI C. */ |
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455 | |
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456 | extern int warn_traditional; |
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457 | |
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458 | /* Warn about *printf or *scanf format/argument anomalies. */ |
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459 | |
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460 | extern int warn_format; |
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461 | |
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462 | /* Warn about a subscript that has type char. */ |
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463 | |
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464 | extern int warn_char_subscripts; |
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465 | |
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466 | /* Warn if a type conversion is done that might have confusing results. */ |
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467 | |
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468 | extern int warn_conversion; |
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469 | |
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470 | /* Warn if main is suspicious. */ |
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471 | |
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472 | extern int warn_main; |
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473 | |
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474 | /* Nonzero means do some things the same way PCC does. */ |
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475 | |
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476 | extern int flag_traditional; |
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477 | |
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478 | /* Nonzero means to allow single precision math even if we're generally |
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479 | being traditional. */ |
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480 | extern int flag_allow_single_precision; |
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481 | |
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482 | /* Nonzero means warn about suggesting putting in ()'s. */ |
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483 | |
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484 | extern int warn_parentheses; |
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485 | |
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486 | /* Warn if initializer is not completely bracketed. */ |
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487 | |
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488 | extern int warn_missing_braces; |
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489 | |
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490 | /* Warn about comparison of signed and unsigned values. */ |
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491 | |
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492 | extern int warn_sign_compare; |
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493 | |
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494 | /* Nonzero means this is a function to call to perform comptypes |
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495 | on two record types. */ |
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496 | |
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497 | extern int (*comptypes_record_hook) (); |
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498 | |
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499 | /* Nonzero means we are reading code that came from a system header file. */ |
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500 | |
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501 | extern int system_header_p; |
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502 | |
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503 | /* Nonzero enables objc features. */ |
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504 | |
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505 | extern int doing_objc_thang; |
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506 | |
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507 | #endif /* not _C_TREE_H */ |
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