config/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         char *name;
  22         int lineno;
  23         int flags;
  24 };
  25
  26 #define FILE_BUSY               0x0001
  27 #define FILE_SCANNED            0x0002
  28
  29 typedef enum tristate {
  30         no, mod, yes
  31 } tristate;
  32
  33 enum expr_type {
  34         E_NONE, E_OR, E_AND, E_NOT, E_EQUAL, E_UNEQUAL, E_LIST, E_SYMBOL, E_RANGE
  35 };
  36
  37 union expr_data {
  38         struct expr *expr;
  39         struct symbol *sym;
  40 };
  41
  42 struct expr {
  43         enum expr_type type;
  44         union expr_data left, right;
  45 };
  46
  47 #define EXPR_OR(dep1, dep2)     (((dep1)>(dep2))?(dep1):(dep2))
  48 #define EXPR_AND(dep1, dep2)    (((dep1)<(dep2))?(dep1):(dep2))
  49 #define EXPR_NOT(dep)           (2-(dep))
  50
  51 #define expr_list_for_each_sym(l, e, s) \
  52         for (e = (l); e && (s = e->right.sym); e = e->left.expr)
  53
  54 struct expr_value {
  55         struct expr *expr;
  56         tristate tri;
  57 };
  58
  59 struct symbol_value {
  60         void *val;
  61         tristate tri;
  62 };
  63
  64 enum symbol_type {
  65         S_UNKNOWN, S_BOOLEAN, S_TRISTATE, S_INT, S_HEX, S_STRING, S_OTHER
  66 };
  67
  68 /* enum values are used as index to symbol.def[] */
  69 enum {
  70         S_DEF_USER,             /* main user value */
  71         S_DEF_AUTO,             /* values read from auto.conf */
  72         S_DEF_DEF3,             /* Reserved for UI usage */
  73         S_DEF_DEF4,             /* Reserved for UI usage */
  74         S_DEF_COUNT
  75 };
  76
  77 struct symbol {
  78         struct symbol *next;
  79         char *name;
  80         enum symbol_type type;
  81         struct symbol_value curr;
  82         struct symbol_value def[S_DEF_COUNT];
  83         tristate visible;
  84         int flags;
  85         struct property *prop;
  86         struct expr_value rev_dep;
  87 };
  88
  89 #define for_all_symbols(i, sym) for (i = 0; i < 257; i++) for (sym = symbol_hash[i]; sym; sym = sym->next) if (sym->type != S_OTHER)
  90
  91 #define SYMBOL_CONST      0x0001  /* symbol is const */
  92 #define SYMBOL_CHECK      0x0008  /* used during dependency checking */
  93 #define SYMBOL_CHOICE     0x0010  /* start of a choice block (null name) */
  94 #define SYMBOL_CHOICEVAL  0x0020  /* used as a value in a choice block */
  95 #define SYMBOL_VALID      0x0080  /* set when symbol.curr is calculated */
  96 #define SYMBOL_OPTIONAL   0x0100  /* choice is optional - values can be 'n' */
  97 #define SYMBOL_WRITE      0x0200  /* ? */
  98 #define SYMBOL_CHANGED    0x0400  /* ? */
  99 #define SYMBOL_AUTO       0x1000  /* value from environment variable */
 100 #define SYMBOL_CHECKED    0x2000  /* used during dependency checking */
 101 #define SYMBOL_WARNED     0x8000  /* warning has been issued */
 102
 103 /* Set when symbol.def[] is used */
 104 #define SYMBOL_DEF        0x10000  /* First bit of SYMBOL_DEF */
 105 #define SYMBOL_DEF_USER   0x10000  /* symbol.def[S_DEF_USER] is valid */
 106 #define SYMBOL_DEF_AUTO   0x20000  /* symbol.def[S_DEF_AUTO] is valid */
 107 #define SYMBOL_DEF3       0x40000  /* symbol.def[S_DEF_3] is valid */
 108 #define SYMBOL_DEF4       0x80000  /* symbol.def[S_DEF_4] is valid */
 109
 110 #define SYMBOL_MAXLENGTH        256
 111 #define SYMBOL_HASHSIZE         257
 112 #define SYMBOL_HASHMASK         0xff
 113
 114 /* A property represent the config options that can be associated
 115  * with a config "symbol".
 116  * Sample:
 117  * config FOO
 118  *         default y
 119  *         prompt "foo prompt"
 120  *         select BAR
 121  * config BAZ
 122  *         int "BAZ Value"
 123  *         range 1..255
 124  */
 125 enum prop_type {
 126         P_UNKNOWN,
 127         P_PROMPT,   /* prompt "foo prompt" or "BAZ Value" */
 128         P_COMMENT,  /* text associated with a comment */
 129         P_MENU,     /* prompt associated with a menuconfig option */
 130         P_DEFAULT,  /* default y */
 131         P_CHOICE,   /* choice value */
 132         P_SELECT,   /* select BAR */
 133         P_RANGE,    /* range 7..100 (for a symbol) */
 134         P_ENV,      /* value from environment variable */
 135 };
 136
 137 struct property {
 138         struct property *next;     /* next property - null if last */
 139         struct symbol *sym;        /* the symbol for which the property is associated */
 140         enum prop_type type;       /* type of property */
 141         const char *text;          /* the prompt value - P_PROMPT, P_MENU, P_COMMENT */
 142         struct expr_value visible;
 143         struct expr *expr;         /* the optional conditional part of the property */
 144         struct menu *menu;         /* the menu the property are associated with
 145                                     * valid for: P_SELECT, P_RANGE, P_CHOICE,
 146                                     * P_PROMPT, P_DEFAULT, P_MENU, P_COMMENT */
 147         struct file *file;         /* what file was this property defined */
 148         int lineno;                /* what lineno was this property defined */
 149 };
 150
 151 #define for_all_properties(sym, st, tok) \
 152         for (st = sym->prop; st; st = st->next) \
 153                 if (st->type == (tok))
 154 #define for_all_defaults(sym, st) for_all_properties(sym, st, P_DEFAULT)
 155 #define for_all_choices(sym, st) for_all_properties(sym, st, P_CHOICE)
 156 #define for_all_prompts(sym, st) \
 157         for (st = sym->prop; st; st = st->next) \
 158                 if (st->text)
 159
 160 struct menu {
 161         struct menu *next;
 162         struct menu *parent;
 163         struct menu *list;
 164         struct symbol *sym;
 165         struct property *prompt;
 166         struct expr *dep;
 167         unsigned int flags;
 168         char *help;
 169         struct file *file;
 170         int lineno;
 171         void *data;
 172 };
 173
 174 #define MENU_CHANGED            0x0001
 175 #define MENU_ROOT               0x0002
 176
 177 #ifndef SWIG
 178
 179 extern struct file *file_list;
 180 extern struct file *current_file;
 181 struct file *lookup_file(const char *name);
 182
 183 extern struct symbol symbol_yes, symbol_no, symbol_mod;
 184 extern struct symbol *modules_sym;
 185 extern struct symbol *sym_defconfig_list;
 186 extern int cdebug;
 187 struct expr *expr_alloc_symbol(struct symbol *sym);
 188 struct expr *expr_alloc_one(enum expr_type type, struct expr *ce);
 189 struct expr *expr_alloc_two(enum expr_type type, struct expr *e1, struct expr *e2);
 190 struct expr *expr_alloc_comp(enum expr_type type, struct symbol *s1, struct symbol *s2);
 191 struct expr *expr_alloc_and(struct expr *e1, struct expr *e2);
 192 struct expr *expr_alloc_or(struct expr *e1, struct expr *e2);
 193 struct expr *expr_copy(struct expr *org);
 194 void expr_free(struct expr *e);
 195 int expr_eq(struct expr *e1, struct expr *e2);
 196 void expr_eliminate_eq(struct expr **ep1, struct expr **ep2);
 197 tristate expr_calc_value(struct expr *e);
 198 struct expr *expr_eliminate_yn(struct expr *e);
 199 struct expr *expr_trans_bool(struct expr *e);
 200 struct expr *expr_eliminate_dups(struct expr *e);
 201 struct expr *expr_transform(struct expr *e);
 202 int expr_contains_symbol(struct expr *dep, struct symbol *sym);
 203 bool expr_depends_symbol(struct expr *dep, struct symbol *sym);
 204 struct expr *expr_extract_eq_and(struct expr **ep1, struct expr **ep2);
 205 struct expr *expr_extract_eq_or(struct expr **ep1, struct expr **ep2);
 206 void expr_extract_eq(enum expr_type type, struct expr **ep, struct expr **ep1, struct expr **ep2);
 207 struct expr *expr_trans_compare(struct expr *e, enum expr_type type, struct symbol *sym);
 208
 209 void expr_fprint(struct expr *e, FILE *out);
 210 struct gstr; /* forward */
 211 void expr_gstr_print(struct expr *e, struct gstr *gs);
 212
 213 static inline int expr_is_yes(struct expr *e)
 214 {
 215         return !e || (e->type == E_SYMBOL && e->left.sym == &symbol_yes);
 216 }
 217
 218 static inline int expr_is_no(struct expr *e)
 219 {
 220         return e && (e->type == E_SYMBOL && e->left.sym == &symbol_no);
 221 }
 222 #endif
 223
 224 #ifdef __cplusplus
 225 }
 226 #endif
 227
 228 #endif /* EXPR_H */