scripts/kconfig/expr.h

   1 /*
   2  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
   3  * Released under the terms of the GNU GPL v2.0.
   4  */
   5
   6 #ifndef EXPR_H
   7 #define EXPR_H
   8
   9 #ifdef __cplusplus
  10 extern "C" {
  11 #endif
  12
  13 #include <stdio.h>
  14 #ifndef __cplusplus
  15 #include <stdbool.h>
  16 #endif
  17
  18 struct file {
  19         struct file *next;
  20         struct file *parent;
  21         const char *name;
  22         int lineno;
  23 };
  24
  25 typedef enum tristate {
  26         no, mod, yes
  27 } tristate;
  28
  29 enum expr_type {
  30         E_NONE, E_OR, E_AND, E_NOT, E_EQUAL, E_UNEQUAL, E_LIST, E_SYMBOL, E_RANGE
  31 };
  32
  33 union expr_data {
  34         struct expr *expr;
  35         struct symbol *sym;
  36 };
  37
  38 struct expr {
  39         enum expr_type type;
  40         union expr_data left, right;
  41 };
  42
  43 #define EXPR_OR(dep1, dep2)     (((dep1)>(dep2))?(dep1):(dep2))
  44 #define EXPR_AND(dep1, dep2)    (((dep1)<(dep2))?(dep1):(dep2))
  45 #define EXPR_NOT(dep)           (2-(dep))
  46
  47 #define expr_list_for_each_sym(l, e, s) \
  48         for (e = (l); e && (s = e->right.sym); e = e->left.expr)
  49
  50 struct expr_value {
  51         struct expr *expr;
  52         tristate tri;
  53 };
  54
  55 struct symbol_value {
  56         void *val;
  57         tristate tri;
  58 };
  59
  60 enum symbol_type {
  61         S_UNKNOWN, S_BOOLEAN, S_TRISTATE, S_INT, S_HEX, S_STRING, S_OTHER
  62 };
  63
  64 /* enum values are used as index to symbol.def[] */
  65 enum {
  66         S_DEF_USER,             /* main user value */
  67         S_DEF_AUTO,             /* values read from auto.conf */
  68         S_DEF_DEF3,             /* Reserved for UI usage */
  69         S_DEF_DEF4,             /* Reserved for UI usage */
  70         S_DEF_COUNT
  71 };
  72
  73 struct symbol {
  74         struct symbol *next;
  75         char *name;
  76         enum symbol_type type;
  77         struct symbol_value curr;
  78         struct symbol_value def[S_DEF_COUNT];
  79         tristate visible;
  80         int flags;
  81         struct property *prop;
  82         struct expr_value dir_dep;
  83         struct expr_value rev_dep;
  84 };
  85
  86 #define for_all_symbols(i, sym) for (i = 0; i < SYMBOL_HASHSIZE; i++) for (sym = symbol_hash[i]; sym; sym = sym->next) if (sym->type != S_OTHER)
  87
  88 #define SYMBOL_CONST      0x0001  /* symbol is const */
  89 #define SYMBOL_CHECK      0x0008  /* used during dependency checking */
  90 #define SYMBOL_CHOICE     0x0010  /* start of a choice block (null name) */
  91 #define SYMBOL_CHOICEVAL  0x0020  /* used as a value in a choice block */
  92 #define SYMBOL_VALID      0x0080  /* set when symbol.curr is calculated */
  93 #define SYMBOL_OPTIONAL   0x0100  /* choice is optional - values can be 'n' */
  94 #define SYMBOL_WRITE      0x0200  /* ? */
  95 #define SYMBOL_CHANGED    0x0400  /* ? */
  96 #define SYMBOL_AUTO       0x1000  /* value from environment variable */
  97 #define SYMBOL_CHECKED    0x2000  /* used during dependency checking */
  98 #define SYMBOL_WARNED     0x8000  /* warning has been issued */
  99
 100 /* Set when symbol.def[] is used */
 101 #define SYMBOL_DEF        0x10000  /* First bit of SYMBOL_DEF */
 102 #define SYMBOL_DEF_USER   0x10000  /* symbol.def[S_DEF_USER] is valid */
 103 #define SYMBOL_DEF_AUTO   0x20000  /* symbol.def[S_DEF_AUTO] is valid */
 104 #define SYMBOL_DEF3       0x40000  /* symbol.def[S_DEF_3] is valid */
 105 #define SYMBOL_DEF4       0x80000  /* symbol.def[S_DEF_4] is valid */
 106
 107 #define SYMBOL_MAXLENGTH        256
 108 #define SYMBOL_HASHSIZE         9973
 109
 110 /* A property represent the config options that can be associated
 111  * with a config "symbol".
 112  * Sample:
 113  * config FOO
 114  *         default y
 115  *         prompt "foo prompt"
 116  *         select BAR
 117  * config BAZ
 118  *         int "BAZ Value"
 119  *         range 1..255
 120  */
 121 enum prop_type {
 122         P_UNKNOWN,
 123         P_PROMPT,   /* prompt "foo prompt" or "BAZ Value" */
 124         P_COMMENT,  /* text associated with a comment */
 125         P_MENU,     /* prompt associated with a menuconfig option */
 126         P_DEFAULT,  /* default y */
 127         P_CHOICE,   /* choice value */
 128         P_SELECT,   /* select BAR */
 129         P_RANGE,    /* range 7..100 (for a symbol) */
 130         P_ENV,      /* value from environment variable */
 131         P_SYMBOL,   /* where a symbol is defined */
 132 };
 133
 134 struct property {
 135         struct property *next;     /* next property - null if last */
 136         struct symbol *sym;        /* the symbol for which the property is associated */
 137         enum prop_type type;       /* type of property */
 138         const char *text;          /* the prompt value - P_PROMPT, P_MENU, P_COMMENT */
 139         struct expr_value visible;
 140         struct expr *expr;         /* the optional conditional part of the property */
 141         struct menu *menu;         /* the menu the property are associated with
 142                                     * valid for: P_SELECT, P_RANGE, P_CHOICE,
 143                                     * P_PROMPT, P_DEFAULT, P_MENU, P_COMMENT */
 144         struct file *file;         /* what file was this property defined */
 145         int lineno;                /* what lineno was this property defined */
 146 };
 147
 148 #define for_all_properties(sym, st, tok) \
 149         for (st = sym->prop; st; st = st->next) \
 150                 if (st->type == (tok))
 151 #define for_all_defaults(sym, st) for_all_properties(sym, st, P_DEFAULT)
 152 #define for_all_choices(sym, st) for_all_properties(sym, st, P_CHOICE)
 153 #define for_all_prompts(sym, st) \
 154         for (st = sym->prop; st; st = st->next) \
 155                 if (st->text)
 156
 157 struct menu {
 158         struct menu *next;
 159         struct menu *parent;
 160         struct menu *list;
 161         struct symbol *sym;
 162         struct property *prompt;
 163         struct expr *visibility;
 164         struct expr *dep;
 165         unsigned int flags;
 166         char *help;
 167         struct file *file;
 168         int lineno;
 169         void *data;
 170 };
 171
 172 #define MENU_CHANGED            0x0001
 173 #define MENU_ROOT               0x0002
 174
 175 extern struct file *file_list;
 176 extern struct file *current_file;
 177 struct file *lookup_file(const char *name);
 178
 179 extern struct symbol symbol_yes, symbol_no, symbol_mod;
 180 extern struct symbol *modules_sym;
 181 extern struct symbol *sym_defconfig_list;
 182 extern int cdebug;
 183 struct expr *expr_alloc_symbol(struct symbol *sym);
 184 struct expr *expr_alloc_one(enum expr_type type, struct expr *ce);
 185 struct expr *expr_alloc_two(enum expr_type type, struct expr *e1, struct expr *e2);
 186 struct expr *expr_alloc_comp(enum expr_type type, struct symbol *s1, struct symbol *s2);
 187 struct expr *expr_alloc_and(struct expr *e1, struct expr *e2);
 188 struct expr *expr_alloc_or(struct expr *e1, struct expr *e2);
 189 struct expr *expr_copy(const struct expr *org);
 190 void expr_free(struct expr *e);
 191 int expr_eq(struct expr *e1, struct expr *e2);
 192 void expr_eliminate_eq(struct expr **ep1, struct expr **ep2);
 193 tristate expr_calc_value(struct expr *e);
 194 struct expr *expr_eliminate_yn(struct expr *e);
 195 struct expr *expr_trans_bool(struct expr *e);
 196 struct expr *expr_eliminate_dups(struct expr *e);
 197 struct expr *expr_transform(struct expr *e);
 198 int expr_contains_symbol(struct expr *dep, struct symbol *sym);
 199 bool expr_depends_symbol(struct expr *dep, struct symbol *sym);
 200 struct expr *expr_extract_eq_and(struct expr **ep1, struct expr **ep2);
 201 struct expr *expr_extract_eq_or(struct expr **ep1, struct expr **ep2);
 202 void expr_extract_eq(enum expr_type type, struct expr **ep, struct expr **ep1, struct expr **ep2);
 203 struct expr *expr_trans_compare(struct expr *e, enum expr_type type, struct symbol *sym);
 204 struct expr *expr_simplify_unmet_dep(struct expr *e1, struct expr *e2);
 205
 206 void expr_fprint(struct expr *e, FILE *out);
 207 struct gstr; /* forward */
 208 void expr_gstr_print(struct expr *e, struct gstr *gs);
 209
 210 static inline int expr_is_yes(struct expr *e)
 211 {
 212         return !e || (e->type == E_SYMBOL && e->left.sym == &symbol_yes);
 213 }
 214
 215 static inline int expr_is_no(struct expr *e)
 216 {
 217         return e && (e->type == E_SYMBOL && e->left.sym == &symbol_no);
 218 }
 219
 220 #ifdef __cplusplus
 221 }
 222 #endif
 223
 224 #endif /* EXPR_H */