1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org> 4 */ 5 6 #ifndef EXPR_H 7 #define EXPR_H 8 9 #ifdef __cplusplus 10 extern "C" { 11 #endif 12 13 #include <assert.h> 14 #include <stdio.h> 15 #ifndef __cplusplus 16 #include <stdbool.h> 17 #endif 18 19 #include <list_types.h> 20 21 typedef enum tristate { 22 no, mod, yes 23 } tristate; 24 25 enum expr_type { 26 E_NONE, E_OR, E_AND, E_NOT, 27 E_EQUAL, E_UNEQUAL, E_LTH, E_LEQ, E_GTH, E_GEQ, 28 E_SYMBOL, E_RANGE 29 }; 30 31 union expr_data { 32 struct expr * const expr; 33 struct symbol * const sym; 34 void *_initdata; 35 }; 36 37 /** 38 * struct expr - expression 39 * 40 * @node: link node for the hash table 41 * @type: expressoin type 42 * @val: calculated tristate value 43 * @val_is_valid: indicate whether the value is valid 44 * @left: left node 45 * @right: right node 46 */ 47 struct expr { 48 struct hlist_node node; 49 enum expr_type type; 50 tristate val; 51 bool val_is_valid; 52 union expr_data left, right; 53 }; 54 55 #define EXPR_OR(dep1, dep2) (((dep1)>(dep2))?(dep1):(dep2)) 56 #define EXPR_AND(dep1, dep2) (((dep1)<(dep2))?(dep1):(dep2)) 57 #define EXPR_NOT(dep) (2-(dep)) 58 59 struct expr_value { 60 struct expr *expr; 61 tristate tri; 62 }; 63 64 struct symbol_value { 65 void *val; 66 tristate tri; 67 }; 68 69 enum symbol_type { 70 S_UNKNOWN, S_BOOLEAN, S_TRISTATE, S_INT, S_HEX, S_STRING 71 }; 72 73 /* enum values are used as index to symbol.def[] */ 74 enum { 75 S_DEF_USER, /* main user value */ 76 S_DEF_AUTO, /* values read from auto.conf */ 77 S_DEF_DEF3, /* Reserved for UI usage */ 78 S_DEF_DEF4, /* Reserved for UI usage */ 79 S_DEF_COUNT 80 }; 81 82 /* 83 * Represents a configuration symbol. 84 * 85 * Choices are represented as a special kind of symbol with null name. 86 * 87 * @choice_link: linked to menu::choice_members 88 */ 89 struct symbol { 90 /* link node for the hash table */ 91 struct hlist_node node; 92 93 /* The name of the symbol, e.g. "FOO" for 'config FOO' */ 94 char *name; 95 96 /* S_BOOLEAN, S_TRISTATE, ... */ 97 enum symbol_type type; 98 99 /* 100 * The calculated value of the symbol. The SYMBOL_VALID bit is set in 101 * 'flags' when this is up to date. Note that this value might differ 102 * from the user value set in e.g. a .config file, due to visibility. 103 */ 104 struct symbol_value curr; 105 106 /* 107 * Values for the symbol provided from outside. def[S_DEF_USER] holds 108 * the .config value. 109 */ 110 struct symbol_value def[S_DEF_COUNT]; 111 112 /* 113 * An upper bound on the tristate value the user can set for the symbol 114 * if it is a boolean or tristate. Calculated from prompt dependencies, 115 * which also inherit dependencies from enclosing menus, choices, and 116 * ifs. If 'n', the user value will be ignored. 117 * 118 * Symbols lacking prompts always have visibility 'n'. 119 */ 120 tristate visible; 121 122 /* config entries associated with this symbol */ 123 struct list_head menus; 124 125 struct list_head choice_link; 126 127 /* SYMBOL_* flags */ 128 int flags; 129 130 /* List of properties. See prop_type. */ 131 struct property *prop; 132 133 /* Dependencies from enclosing menus, choices, and ifs */ 134 struct expr_value dir_dep; 135 136 /* Reverse dependencies through being selected by other symbols */ 137 struct expr_value rev_dep; 138 139 /* 140 * "Weak" reverse dependencies through being implied by other symbols 141 */ 142 struct expr_value implied; 143 }; 144 145 #define SYMBOL_CONST 0x0001 /* symbol is const */ 146 #define SYMBOL_CHECK 0x0008 /* used during dependency checking */ 147 #define SYMBOL_VALID 0x0080 /* set when symbol.curr is calculated */ 148 #define SYMBOL_WRITE 0x0200 /* write symbol to file (KCONFIG_CONFIG) */ 149 #define SYMBOL_WRITTEN 0x0800 /* track info to avoid double-write to .config */ 150 #define SYMBOL_CHECKED 0x2000 /* used during dependency checking */ 151 #define SYMBOL_WARNED 0x8000 /* warning has been issued */ 152 153 /* Set when symbol.def[] is used */ 154 #define SYMBOL_DEF 0x10000 /* First bit of SYMBOL_DEF */ 155 #define SYMBOL_DEF_USER 0x10000 /* symbol.def[S_DEF_USER] is valid */ 156 #define SYMBOL_DEF_AUTO 0x20000 /* symbol.def[S_DEF_AUTO] is valid */ 157 #define SYMBOL_DEF3 0x40000 /* symbol.def[S_DEF_3] is valid */ 158 #define SYMBOL_DEF4 0x80000 /* symbol.def[S_DEF_4] is valid */ 159 160 #define SYMBOL_MAXLENGTH 256 161 162 /* A property represent the config options that can be associated 163 * with a config "symbol". 164 * Sample: 165 * config FOO 166 * default y 167 * prompt "foo prompt" 168 * select BAR 169 * config BAZ 170 * int "BAZ Value" 171 * range 1..255 172 * 173 * Please, also check parser.y:print_symbol() when modifying the 174 * list of property types! 175 */ 176 enum prop_type { 177 P_UNKNOWN, 178 P_PROMPT, /* prompt "foo prompt" or "BAZ Value" */ 179 P_COMMENT, /* text associated with a comment */ 180 P_MENU, /* prompt associated with a menu or menuconfig symbol */ 181 P_DEFAULT, /* default y */ 182 P_SELECT, /* select BAR */ 183 P_IMPLY, /* imply BAR */ 184 P_RANGE, /* range 7..100 (for a symbol) */ 185 }; 186 187 struct property { 188 struct property *next; /* next property - null if last */ 189 enum prop_type type; /* type of property */ 190 const char *text; /* the prompt value - P_PROMPT, P_MENU, P_COMMENT */ 191 struct expr_value visible; 192 struct expr *expr; /* the optional conditional part of the property */ 193 struct menu *menu; /* the menu the property are associated with 194 * valid for: P_SELECT, P_RANGE, 195 * P_PROMPT, P_DEFAULT, P_MENU, P_COMMENT */ 196 const char *filename; /* what file was this property defined */ 197 int lineno; /* what lineno was this property defined */ 198 }; 199 200 #define for_all_properties(sym, st, tok) \ 201 for (st = sym->prop; st; st = st->next) \ 202 if (st->type == (tok)) 203 #define for_all_defaults(sym, st) for_all_properties(sym, st, P_DEFAULT) 204 #define for_all_prompts(sym, st) \ 205 for (st = sym->prop; st; st = st->next) \ 206 if (st->text) 207 208 /* 209 * Represents a node in the menu tree, as seen in e.g. menuconfig (though used 210 * for all front ends). Each symbol, menu, etc. defined in the Kconfig files 211 * gets a node. A symbol defined in multiple locations gets one node at each 212 * location. 213 * 214 * @choice_members: list of choice members with priority. 215 */ 216 struct menu { 217 /* The next menu node at the same level */ 218 struct menu *next; 219 220 /* The parent menu node, corresponding to e.g. a menu or choice */ 221 struct menu *parent; 222 223 /* The first child menu node, for e.g. menus and choices */ 224 struct menu *list; 225 226 /* 227 * The symbol associated with the menu node. Choices are implemented as 228 * a special kind of symbol. NULL for menus, comments, and ifs. 229 */ 230 struct symbol *sym; 231 232 struct list_head link; /* link to symbol::menus */ 233 234 struct list_head choice_members; 235 236 /* 237 * The prompt associated with the node. This holds the prompt for a 238 * symbol as well as the text for a menu or comment, along with the 239 * type (P_PROMPT, P_MENU, etc.) 240 */ 241 struct property *prompt; 242 243 /* 244 * 'visible if' dependencies. If more than one is given, they will be 245 * ANDed together. 246 */ 247 struct expr *visibility; 248 249 /* 250 * Ordinary dependencies from e.g. 'depends on' and 'if', ANDed 251 * together 252 */ 253 struct expr *dep; 254 255 /* MENU_* flags */ 256 unsigned int flags; 257 258 /* Any help text associated with the node */ 259 char *help; 260 261 /* The location where the menu node appears in the Kconfig files */ 262 const char *filename; 263 int lineno; 264 265 /* For use by front ends that need to store auxiliary data */ 266 void *data; 267 }; 268 269 /* 270 * Set on a menu node when the corresponding symbol changes state in some way. 271 * Can be checked by front ends. 272 */ 273 #define MENU_CHANGED 0x0001 274 275 #define MENU_ROOT 0x0002 276 277 struct jump_key { 278 struct list_head entries; 279 size_t offset; 280 struct menu *target; 281 }; 282 283 extern struct symbol symbol_yes, symbol_no, symbol_mod; 284 extern struct symbol *modules_sym; 285 extern int cdebug; 286 struct expr *expr_alloc_symbol(struct symbol *sym); 287 struct expr *expr_alloc_one(enum expr_type type, struct expr *ce); 288 struct expr *expr_alloc_two(enum expr_type type, struct expr *e1, struct expr *e2); 289 struct expr *expr_alloc_comp(enum expr_type type, struct symbol *s1, struct symbol *s2); 290 struct expr *expr_alloc_and(struct expr *e1, struct expr *e2); 291 struct expr *expr_alloc_or(struct expr *e1, struct expr *e2); 292 void expr_eliminate_eq(struct expr **ep1, struct expr **ep2); 293 bool expr_eq(struct expr *e1, struct expr *e2); 294 tristate expr_calc_value(struct expr *e); 295 struct expr *expr_eliminate_dups(struct expr *e); 296 struct expr *expr_transform(struct expr *e); 297 bool expr_contains_symbol(struct expr *dep, struct symbol *sym); 298 bool expr_depends_symbol(struct expr *dep, struct symbol *sym); 299 struct expr *expr_trans_compare(struct expr *e, enum expr_type type, struct symbol *sym); 300 301 void expr_fprint(struct expr *e, FILE *out); 302 struct gstr; /* forward */ 303 void expr_gstr_print(const struct expr *e, struct gstr *gs); 304 void expr_gstr_print_revdep(struct expr *e, struct gstr *gs, 305 tristate pr_type, const char *title); 306 307 static inline bool expr_is_yes(const struct expr *e) 308 { 309 return !e || (e->type == E_SYMBOL && e->left.sym == &symbol_yes); 310 } 311 312 #ifdef __cplusplus 313 } 314 #endif 315 316 #endif /* EXPR_H */ 317