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author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Mon, 25 May 2020 18:13:55 +0900
parents 1830386684a0
children
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1 /* Process source files and output type information.
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2 Copyright (C) 2002-2020 Free Software Foundation, Inc.
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4 This file is part of GCC.
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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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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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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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20 #ifndef GCC_GENGTYPE_H
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21 #define GCC_GENGTYPE_H
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23 #define obstack_chunk_alloc xmalloc
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24 #define obstack_chunk_free free
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25 #define OBSTACK_CHUNK_SIZE 0
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27 /* Sets of accepted source languages like C, C++, Ada... are
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28 represented by a bitmap. */
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29 typedef unsigned lang_bitmap;
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31 /* Variable length structure representing an input file. A hash table
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32 ensure uniqueness for a given input file name. The only function
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33 allocating input_file-s is input_file_by_name. */
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34 struct input_file_st
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35 {
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36 struct outf* inpoutf; /* Cached corresponding output file, computed
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37 in get_output_file_with_visibility. */
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38 lang_bitmap inpbitmap; /* The set of languages using this file. */
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39 bool inpisplugin; /* Flag set for plugin input files. */
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40 char inpname[1]; /* A variable-length array, ended by a null
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41 char. */
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42 };
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43 typedef struct input_file_st input_file;
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44
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45 /* A file position, mostly for error messages.
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46 The FILE element may be compared using pointer equality. */
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47 struct fileloc
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48 {
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49 const input_file *file;
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50 int line;
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51 };
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54 /* Table of all input files and its size. */
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55 extern const input_file** gt_files;
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56 extern size_t num_gt_files;
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58 /* A number of places use the name of this "gengtype.c" file for a
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59 location for things that we can't rely on the source to define. We
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60 also need to refer to the "system.h" file specifically. These two
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61 pointers are initialized early in main. */
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62 extern input_file* this_file;
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63 extern input_file* system_h_file;
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64
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65 /* Retrieve or create the input_file for a given name, which is a file
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66 path. This is the only function allocating input_file-s and it is
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67 hash-consing them. */
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68 input_file* input_file_by_name (const char* name);
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70 /* For F an input_file, return the relative path to F from $(srcdir)
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71 if the latter is a prefix in F, NULL otherwise. */
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72 const char *get_file_srcdir_relative_path (const input_file *inpf);
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73
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74 /* Get the name of an input file. */
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75 static inline const char*
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76 get_input_file_name (const input_file *inpf)
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77 {
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78 if (inpf)
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79 return inpf->inpname;
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80 return NULL;
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81 }
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82
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83 /* Return a bitmap which has bit `1 << BASE_FILE_<lang>' set iff
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84 INPUT_FILE is used by <lang>.
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85
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86 This function should be written to assume that a file _is_ used
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87 if the situation is unclear. If it wrongly assumes a file _is_ used,
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88 a linker error will result. If it wrongly assumes a file _is not_ used,
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89 some GC roots may be missed, which is a much harder-to-debug problem.
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90 */
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91
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92 static inline lang_bitmap
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93 get_lang_bitmap (const input_file* inpf)
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94 {
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95 if (inpf == NULL)
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96 return 0;
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97 return inpf->inpbitmap;
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98 }
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99
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100 /* Set the bitmap returned by get_lang_bitmap. The only legitimate
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101 callers of this function are read_input_list & read_state_*. */
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102 static inline void
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103 set_lang_bitmap (input_file* inpf, lang_bitmap n)
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104 {
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105 gcc_assert (inpf);
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106 inpf->inpbitmap = n;
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107 }
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108
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109 /* Vector of per-language directories. */
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110 extern const char **lang_dir_names;
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111 extern size_t num_lang_dirs;
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112
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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113 /* Data types handed around within, but opaque to, the lexer and parser. */
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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114 typedef struct pair *pair_p;
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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115 typedef struct type *type_p;
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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116 typedef const struct type *const_type_p;
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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117 typedef struct options *options_p;
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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118
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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119 /* Variables used to communicate between the lexer and the parser. */
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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120 extern int lexer_toplevel_done;
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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121 extern struct fileloc lexer_line;
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kent <kent@cr.ie.u-ryukyu.ac.jp>
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122
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123 /* Various things, organized as linked lists, needed both in
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124 gengtype.c & in gengtype-state.c files. */
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125 extern pair_p typedefs;
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126 extern type_p structures;
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127 extern pair_p variables;
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128
111
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129 /* An enum for distinguishing GGC vs PCH. */
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130
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131 enum write_types_kinds
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132 {
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133 WTK_GGC,
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134 WTK_PCH,
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135
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136 NUM_WTK
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137 };
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138
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139 /* Discrimating kind of types we can understand. */
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140
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141 enum typekind {
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142 TYPE_NONE=0, /* Never used, so zeroed memory is invalid. */
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143 TYPE_UNDEFINED, /* We have not yet seen a definition for this type.
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144 If a type is still undefined when generating code,
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145 an error will be generated. */
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146 TYPE_SCALAR, /* Scalar types like char. */
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147 TYPE_STRING, /* The string type. */
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148 TYPE_STRUCT, /* Type for GTY-ed structs. */
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149 TYPE_UNION, /* Type for GTY-ed discriminated unions. */
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150 TYPE_POINTER, /* Pointer type to GTY-ed type. */
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151 TYPE_ARRAY, /* Array of GTY-ed types. */
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152 TYPE_LANG_STRUCT, /* GCC front-end language specific structs.
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153 Various languages may have homonymous but
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154 different structs. */
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155 TYPE_USER_STRUCT /* User defined type. Walkers and markers for
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156 this type are assumed to be provided by the
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157 user. */
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158 };
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159
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160 /* Discriminating kind for options. */
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161 enum option_kind {
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162 OPTION_NONE=0, /* Never used, so zeroed memory is invalid. */
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163 OPTION_STRING, /* A string-valued option. Most options are
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164 strings. */
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165 OPTION_TYPE, /* A type-valued option. */
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166 OPTION_NESTED /* Option data for 'nested_ptr'. */
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167 };
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168
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169
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170 /* A way to pass data through to the output end. */
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171 struct options {
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172 struct options *next; /* next option of the same pair. */
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173 const char *name; /* GTY option name. */
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174 enum option_kind kind; /* discriminating option kind. */
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175 union {
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176 const char* string; /* When OPTION_STRING. */
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177 type_p type; /* When OPTION_TYPE. */
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178 struct nested_ptr_data* nested; /* when OPTION_NESTED. */
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179 } info;
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180 };
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181
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182
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183 /* Option data for the 'nested_ptr' option. */
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184 struct nested_ptr_data {
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185 type_p type;
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186 const char *convert_to;
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187 const char *convert_from;
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188 };
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189
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190 /* Some functions to create various options structures with name NAME
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191 and info INFO. NEXT is the next option in the chain. */
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192
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193 /* Create a string option. */
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194 options_p create_string_option (options_p next, const char* name,
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195 const char* info);
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196
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197 /* Create a type option. */
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198 options_p create_type_option (options_p next, const char* name,
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199 type_p info);
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200
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201 /* Create a nested option. */
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202 options_p create_nested_option (options_p next, const char* name,
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203 struct nested_ptr_data* info);
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204
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205 /* Create a nested pointer option. */
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206 options_p create_nested_ptr_option (options_p next, type_p t,
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207 const char *to, const char *from);
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208
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209 /* A name and a type. */
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210 struct pair {
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211 pair_p next; /* The next pair in the linked list. */
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212 const char *name; /* The defined name. */
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213 type_p type; /* Its GTY-ed type. */
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214 struct fileloc line; /* The file location. */
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215 options_p opt; /* GTY options, as a linked list. */
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216 };
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217
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218 /* Usage information for GTY-ed types. Gengtype has to care only of
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219 used GTY-ed types. Types are initially unused, and their usage is
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220 computed by set_gc_used_type and set_gc_used functions. */
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221
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222 enum gc_used_enum {
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223
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224 /* We need that zeroed types are initially unused. */
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225 GC_UNUSED=0,
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226
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227 /* The GTY-ed type is used, e.g by a GTY-ed variable or a field
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228 inside a GTY-ed used type. */
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229 GC_USED,
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230
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231 /* For GTY-ed structures whose definitions we haven't seen so far
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232 when we encounter a pointer to it that is annotated with
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233 ``maybe_undef''. If after reading in everything we don't have
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234 source file information for it, we assume that it never has been
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235 defined. */
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236 GC_MAYBE_POINTED_TO,
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237
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238 /* For known GTY-ed structures which are pointed to by GTY-ed
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239 variables or fields. */
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240 GC_POINTED_TO
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241 };
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242
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243 /* Our type structure describes all types handled by gengtype. */
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244 struct type {
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245 /* Discriminating kind, cannot be TYPE_NONE. */
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246 enum typekind kind;
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247
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248 /* For top-level structs or unions, the 'next' field links the
111
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249 global list 'structures'; for lang_structs, their homonymous structs are
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250 linked using this 'next' field. The homonymous list starts at the
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251 s.lang_struct field of the lang_struct. See the new_structure function
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252 for details. This is tricky! */
67
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253 type_p next;
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254
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255 /* State number used when writing & reading the persistent state. A
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256 type with a positive number has already been written. For ease
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257 of debugging, newly allocated types have a unique negative
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258 number. */
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259 int state_number;
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260
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261 /* Each GTY-ed type which is pointed to by some GTY-ed type knows
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262 the GTY pointer type pointing to it. See create_pointer
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263 function. */
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264 type_p pointer_to;
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265
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266 /* Type usage information, computed by set_gc_used_type and
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267 set_gc_used functions. */
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268 enum gc_used_enum gc_used;
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269
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270 /* The following union is discriminated by the 'kind' field above. */
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271 union {
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272 /* TYPE__NONE is impossible. */
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273
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274 /* when TYPE_POINTER: */
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275 type_p p;
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276
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277 /* when TYPE_STRUCT or TYPE_UNION or TYPE_LANG_STRUCT, we have an
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278 aggregate type containing fields: */
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279 struct {
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280 const char *tag; /* the aggregate tag, if any. */
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281 struct fileloc line; /* the source location. */
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282 pair_p fields; /* the linked list of fields. */
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283 options_p opt; /* the GTY options if any. */
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284 lang_bitmap bitmap; /* the set of front-end languages
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285 using that GTY-ed aggregate. */
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286 /* For TYPE_LANG_STRUCT, the lang_struct field gives the first
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287 element of a linked list of homonymous struct or union types.
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288 Within this list, each homonymous type has as its lang_struct
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289 field the original TYPE_LANG_STRUCT type. This is a dirty
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290 trick, see the new_structure function for details. */
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291 type_p lang_struct;
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292
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293 type_p base_class; /* the parent class, if any. */
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294
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295 /* The following two fields are not serialized in state files, and
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296 are instead reconstructed on load. */
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297
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298 /* The head of a singly-linked list of immediate descendents in
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299 the inheritance hierarchy. */
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300 type_p first_subclass;
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301 /* The next in that list. */
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302 type_p next_sibling_class;
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303
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304 /* Have we already written ggc/pch user func for ptr to this?
kono
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305 (in write_user_func_for_structure_ptr). */
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306 bool wrote_user_func_for_ptr[NUM_WTK];
67
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307 } s;
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308
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309 /* when TYPE_SCALAR: */
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310 bool scalar_is_char;
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311
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312 /* when TYPE_ARRAY: */
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313 struct {
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314 type_p p; /* The array component type. */
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315 const char *len; /* The string if any giving its length. */
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316 } a;
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317
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318 } u;
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319 };
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320
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321 /* The one and only TYPE_STRING. */
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322 extern struct type string_type;
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323
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324 /* The two and only TYPE_SCALARs. Their u.scalar_is_char flags are
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325 set early in main. */
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326 extern struct type scalar_nonchar;
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327 extern struct type scalar_char;
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328
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329 /* Test if a type is a union, either a plain one or a language
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330 specific one. */
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331 #define UNION_P(x) \
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332 ((x)->kind == TYPE_UNION \
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333 || ((x)->kind == TYPE_LANG_STRUCT \
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334 && (x)->u.s.lang_struct->kind == TYPE_UNION))
67
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335
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336 /* Test if a type is a union or a structure, perhaps a language
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337 specific one. */
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338 static inline bool
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339 union_or_struct_p (enum typekind kind)
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340 {
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341 return (kind == TYPE_UNION
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342 || kind == TYPE_STRUCT
kono
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343 || kind == TYPE_LANG_STRUCT
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344 || kind == TYPE_USER_STRUCT);
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345 }
67
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346
111
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347 static inline bool
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348 union_or_struct_p (const_type_p x)
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349 {
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350 return union_or_struct_p (x->kind);
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351 }
67
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352
111
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353 /* Give the file location of a type, if any. */
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354 static inline struct fileloc*
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355 type_fileloc (type_p t)
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356 {
kono
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357 if (!t)
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358 return NULL;
kono
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359 if (union_or_struct_p (t))
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360 return &t->u.s.line;
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361 return NULL;
kono
parents: 67
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362 }
67
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363
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364 /* Structure representing an output file. */
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365 struct outf
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366 {
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367 struct outf *next;
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368 const char *name;
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369 size_t buflength;
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370 size_t bufused;
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371 char *buf;
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372 };
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373 typedef struct outf *outf_p;
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374
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375 /* The list of output files. */
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376 extern outf_p output_files;
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377
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378 /* The output header file that is included into pretty much every
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379 source file. */
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380 extern outf_p header_file;
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381
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382 /* Print, like fprintf, to O. No-op if O is NULL. */
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383 void
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384 oprintf (outf_p o, const char *S, ...)
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385 ATTRIBUTE_PRINTF_2;
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386
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387 /* An output file, suitable for definitions, that can see declarations
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388 made in INPF and is linked into every language that uses INPF. May
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389 return NULL in plugin mode. The INPF argument is almost const, but
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390 since the result is cached in its inpoutf field it cannot be
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391 declared const. */
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392 outf_p get_output_file_with_visibility (input_file* inpf);
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393
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394 /* The name of an output file, suitable for definitions, that can see
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395 declarations made in INPF and is linked into every language that
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396 uses INPF. May return NULL. */
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397 const char *get_output_file_name (input_file *inpf);
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398
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399
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400 /* Source directory. */
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401 extern const char *srcdir; /* (-S) program argument. */
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402
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403 /* Length of srcdir name. */
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404 extern size_t srcdir_len;
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405
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406 /* Variable used for reading and writing the state. */
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407 extern const char *read_state_filename; /* (-r) program argument. */
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408 extern const char *write_state_filename; /* (-w) program argument. */
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409
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410 /* Functions reading and writing the entire gengtype state, called from
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411 main, and implemented in file gengtype-state.c. */
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412 void read_state (const char* path);
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413 /* Write the state, and update the state_number field in types. */
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414 void write_state (const char* path);
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415
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416
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417 /* Print an error message. */
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418 extern void error_at_line
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419 (const struct fileloc *pos, const char *msg, ...) ATTRIBUTE_PRINTF_2;
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420
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421 /* Constructor routines for types. */
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422 extern void do_typedef (const char *s, type_p t, struct fileloc *pos);
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423 extern void do_scalar_typedef (const char *s, struct fileloc *pos);
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424 extern type_p resolve_typedef (const char *s, struct fileloc *pos);
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425 extern void add_subclass (type_p base, type_p subclass);
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426 extern type_p new_structure (const char *name, enum typekind kind,
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427 struct fileloc *pos, pair_p fields,
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428 options_p o, type_p base);
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429 type_p create_user_defined_type (const char *, struct fileloc *);
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430 extern type_p find_structure (const char *s, enum typekind kind);
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431 extern type_p create_scalar_type (const char *name);
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432 extern type_p create_pointer (type_p t);
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433 extern type_p create_array (type_p t, const char *len);
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434 extern pair_p create_field_at (pair_p next, type_p type,
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435 const char *name, options_p opt,
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436 struct fileloc *pos);
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437 extern pair_p nreverse_pairs (pair_p list);
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438 extern type_p adjust_field_type (type_p, options_p);
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439 extern void note_variable (const char *s, type_p t, options_p o,
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440 struct fileloc *pos);
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441
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442 /* Lexer and parser routines. */
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443 extern int yylex (const char **yylval);
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444 extern void yybegin (const char *fname);
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445 extern void yyend (void);
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446 extern void parse_file (const char *name);
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447 extern bool hit_error;
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448
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449 /* Token codes. */
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450 enum gty_token
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451 {
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452 EOF_TOKEN = 0,
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453
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454 /* Per standard convention, codes in the range (0, UCHAR_MAX]
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455 represent single characters with those character codes. */
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456 CHAR_TOKEN_OFFSET = UCHAR_MAX + 1,
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457 GTY_TOKEN = CHAR_TOKEN_OFFSET,
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458 TYPEDEF,
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459 EXTERN,
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460 STATIC,
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461 UNION,
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462 STRUCT,
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463 ENUM,
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464 ELLIPSIS,
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465 PTR_ALIAS,
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466 NESTED_PTR,
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467 USER_GTY,
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468 NUM,
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469 SCALAR,
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470 ID,
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471 STRING,
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472 CHAR,
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473 ARRAY,
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474 IGNORABLE_CXX_KEYWORD,
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475
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476 /* print_token assumes that any token >= FIRST_TOKEN_WITH_VALUE may have
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477 a meaningful value to be printed. */
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478 FIRST_TOKEN_WITH_VALUE = USER_GTY
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479 };
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480
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481
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482 /* Level for verbose messages, e.g. output file generation... */
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483 extern int verbosity_level; /* (-v) program argument. */
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484
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485 /* For debugging purposes we provide two flags. */
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486
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487 /* Dump everything to understand gengtype's state. Might be useful to
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488 gengtype users. */
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489 extern int do_dump; /* (-d) program argument. */
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490
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491 /* Trace the execution by many DBGPRINTF (with the position inside
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492 gengtype source code). Only useful to debug gengtype itself. */
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493 extern int do_debug; /* (-D) program argument. */
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494
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495 #define DBGPRINTF(Fmt,...) do {if (do_debug) \
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496 fprintf (stderr, "%s:%d: " Fmt "\n", \
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497 lbasename (__FILE__),__LINE__, ##__VA_ARGS__);} while (0)
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498 void dbgprint_count_type_at (const char *, int, const char *, type_p);
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499 #define DBGPRINT_COUNT_TYPE(Msg,Ty) do {if (do_debug) \
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500 dbgprint_count_type_at (__FILE__, __LINE__, Msg, Ty);}while (0)
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501
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502 #define FOR_ALL_INHERITED_FIELDS(TYPE, FIELD_VAR) \
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503 for (type_p sub = (TYPE); sub; sub = sub->u.s.base_class) \
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504 for (FIELD_VAR = sub->u.s.fields; FIELD_VAR; FIELD_VAR = FIELD_VAR->next)
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505
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506 extern bool
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507 opts_have (options_p opts, const char *str);
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508
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509
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510 #endif