linux/scripts/kconfig/expr.h
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   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
  10extern "C" {
  11#endif
  12
  13#include <assert.h>
  14#include <stdio.h>
  15#ifndef __cplusplus
  16#include <stdbool.h>
  17#endif
  18
  19struct file {
  20        struct file *next;
  21        struct file *parent;
  22        const char *name;
  23        int lineno;
  24};
  25
  26typedef enum tristate {
  27        no, mod, yes
  28} tristate;
  29
  30enum expr_type {
  31        E_NONE, E_OR, E_AND, E_NOT, E_EQUAL, E_UNEQUAL, E_LIST, E_SYMBOL, E_RANGE
  32};
  33
  34union expr_data {
  35        struct expr *expr;
  36        struct symbol *sym;
  37};
  38
  39struct expr {
  40        enum expr_type type;
  41        union expr_data left, right;
  42};
  43
  44#define EXPR_OR(dep1, dep2)     (((dep1)>(dep2))?(dep1):(dep2))
  45#define EXPR_AND(dep1, dep2)    (((dep1)<(dep2))?(dep1):(dep2))
  46#define EXPR_NOT(dep)           (2-(dep))
  47
  48#define expr_list_for_each_sym(l, e, s) \
  49        for (e = (l); e && (s = e->right.sym); e = e->left.expr)
  50
  51struct expr_value {
  52        struct expr *expr;
  53        tristate tri;
  54};
  55
  56struct symbol_value {
  57        void *val;
  58        tristate tri;
  59};
  60
  61enum symbol_type {
  62        S_UNKNOWN, S_BOOLEAN, S_TRISTATE, S_INT, S_HEX, S_STRING, S_OTHER
  63};
  64
  65/* enum values are used as index to symbol.def[] */
  66enum {
  67        S_DEF_USER,             /* main user value */
  68        S_DEF_AUTO,             /* values read from auto.conf */
  69        S_DEF_DEF3,             /* Reserved for UI usage */
  70        S_DEF_DEF4,             /* Reserved for UI usage */
  71        S_DEF_COUNT
  72};
  73
  74struct symbol {
  75        struct symbol *next;
  76        char *name;
  77        enum symbol_type type;
  78        struct symbol_value curr;
  79        struct symbol_value def[S_DEF_COUNT];
  80        tristate visible;
  81        int flags;
  82        struct property *prop;
  83        struct expr_value dir_dep;
  84        struct expr_value rev_dep;
  85};
  86
  87#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)
  88
  89#define SYMBOL_CONST      0x0001  /* symbol is const */
  90#define SYMBOL_CHECK      0x0008  /* used during dependency checking */
  91#define SYMBOL_CHOICE     0x0010  /* start of a choice block (null name) */
  92#define SYMBOL_CHOICEVAL  0x0020  /* used as a value in a choice block */
  93#define SYMBOL_VALID      0x0080  /* set when symbol.curr is calculated */
  94#define SYMBOL_OPTIONAL   0x0100  /* choice is optional - values can be 'n' */
  95#define SYMBOL_WRITE      0x0200  /* ? */
  96#define SYMBOL_CHANGED    0x0400  /* ? */
  97#define SYMBOL_AUTO       0x1000  /* value from environment variable */
  98#define SYMBOL_CHECKED    0x2000  /* used during dependency checking */
  99#define SYMBOL_WARNED     0x8000  /* warning has been issued */
 100
 101/* Set when symbol.def[] is used */
 102#define SYMBOL_DEF        0x10000  /* First bit of SYMBOL_DEF */
 103#define SYMBOL_DEF_USER   0x10000  /* symbol.def[S_DEF_USER] is valid */
 104#define SYMBOL_DEF_AUTO   0x20000  /* symbol.def[S_DEF_AUTO] is valid */
 105#define SYMBOL_DEF3       0x40000  /* symbol.def[S_DEF_3] is valid */
 106#define SYMBOL_DEF4       0x80000  /* symbol.def[S_DEF_4] is valid */
 107
 108#define SYMBOL_MAXLENGTH        256
 109#define SYMBOL_HASHSIZE         9973
 110
 111/* A property represent the config options that can be associated
 112 * with a config "symbol".
 113 * Sample:
 114 * config FOO
 115 *         default y
 116 *         prompt "foo prompt"
 117 *         select BAR
 118 * config BAZ
 119 *         int "BAZ Value"
 120 *         range 1..255
 121 */
 122enum prop_type {
 123        P_UNKNOWN,
 124        P_PROMPT,   /* prompt "foo prompt" or "BAZ Value" */
 125        P_COMMENT,  /* text associated with a comment */
 126        P_MENU,     /* prompt associated with a menuconfig option */
 127        P_DEFAULT,  /* default y */
 128        P_CHOICE,   /* choice value */
 129        P_SELECT,   /* select BAR */
 130        P_RANGE,    /* range 7..100 (for a symbol) */
 131        P_ENV,      /* value from environment variable */
 132        P_SYMBOL,   /* where a symbol is defined */
 133};
 134
 135struct property {
 136        struct property *next;     /* next property - null if last */
 137        struct symbol *sym;        /* the symbol for which the property is associated */
 138        enum prop_type type;       /* type of property */
 139        const char *text;          /* the prompt value - P_PROMPT, P_MENU, P_COMMENT */
 140        struct expr_value visible;
 141        struct expr *expr;         /* the optional conditional part of the property */
 142        struct menu *menu;         /* the menu the property are associated with
 143                                    * valid for: P_SELECT, P_RANGE, P_CHOICE,
 144                                    * P_PROMPT, P_DEFAULT, P_MENU, P_COMMENT */
 145        struct file *file;         /* what file was this property defined */
 146        int lineno;                /* what lineno was this property defined */
 147};
 148
 149#define for_all_properties(sym, st, tok) \
 150        for (st = sym->prop; st; st = st->next) \
 151                if (st->type == (tok))
 152#define for_all_defaults(sym, st) for_all_properties(sym, st, P_DEFAULT)
 153#define for_all_choices(sym, st) for_all_properties(sym, st, P_CHOICE)
 154#define for_all_prompts(sym, st) \
 155        for (st = sym->prop; st; st = st->next) \
 156                if (st->text)
 157
 158struct menu {
 159        struct menu *next;
 160        struct menu *parent;
 161        struct menu *list;
 162        struct symbol *sym;
 163        struct property *prompt;
 164        struct expr *visibility;
 165        struct expr *dep;
 166        unsigned int flags;
 167        char *help;
 168        struct file *file;
 169        int lineno;
 170        void *data;
 171};
 172
 173#define MENU_CHANGED            0x0001
 174#define MENU_ROOT               0x0002
 175
 176extern struct file *file_list;
 177extern struct file *current_file;
 178struct file *lookup_file(const char *name);
 179
 180extern struct symbol symbol_yes, symbol_no, symbol_mod;
 181extern struct symbol *modules_sym;
 182extern struct symbol *sym_defconfig_list;
 183extern int cdebug;
 184struct expr *expr_alloc_symbol(struct symbol *sym);
 185struct expr *expr_alloc_one(enum expr_type type, struct expr *ce);
 186struct expr *expr_alloc_two(enum expr_type type, struct expr *e1, struct expr *e2);
 187struct expr *expr_alloc_comp(enum expr_type type, struct symbol *s1, struct symbol *s2);
 188struct expr *expr_alloc_and(struct expr *e1, struct expr *e2);
 189struct expr *expr_alloc_or(struct expr *e1, struct expr *e2);
 190struct expr *expr_copy(const struct expr *org);
 191void expr_free(struct expr *e);
 192int expr_eq(struct expr *e1, struct expr *e2);
 193void expr_eliminate_eq(struct expr **ep1, struct expr **ep2);
 194tristate expr_calc_value(struct expr *e);
 195struct expr *expr_eliminate_yn(struct expr *e);
 196struct expr *expr_trans_bool(struct expr *e);
 197struct expr *expr_eliminate_dups(struct expr *e);
 198struct expr *expr_transform(struct expr *e);
 199int expr_contains_symbol(struct expr *dep, struct symbol *sym);
 200bool expr_depends_symbol(struct expr *dep, struct symbol *sym);
 201struct expr *expr_extract_eq_and(struct expr **ep1, struct expr **ep2);
 202struct expr *expr_extract_eq_or(struct expr **ep1, struct expr **ep2);
 203void expr_extract_eq(enum expr_type type, struct expr **ep, struct expr **ep1, struct expr **ep2);
 204struct expr *expr_trans_compare(struct expr *e, enum expr_type type, struct symbol *sym);
 205struct expr *expr_simplify_unmet_dep(struct expr *e1, struct expr *e2);
 206
 207void expr_fprint(struct expr *e, FILE *out);
 208struct gstr; /* forward */
 209void expr_gstr_print(struct expr *e, struct gstr *gs);
 210
 211static inline int expr_is_yes(struct expr *e)
 212{
 213        return !e || (e->type == E_SYMBOL && e->left.sym == &symbol_yes);
 214}
 215
 216static inline int expr_is_no(struct expr *e)
 217{
 218        return e && (e->type == E_SYMBOL && e->left.sym == &symbol_no);
 219}
 220
 221#ifdef __cplusplus
 222}
 223#endif
 224
 225#endif /* EXPR_H */
 226
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