Btrfs: check for a null fs root when writing to the backup root log
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / scripts / kconfig / expr.h
blob80fce57080cc36787e01efc00fe8a111efa3d0ff
1 /*
2 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
3 * Released under the terms of the GNU GPL v2.0.
4 */
6 #ifndef EXPR_H
7 #define EXPR_H
9 #ifdef __cplusplus
10 extern "C" {
11 #endif
13 #include <stdio.h>
14 #ifndef __cplusplus
15 #include <stdbool.h>
16 #endif
18 struct file {
19 struct file *next;
20 struct file *parent;
21 const char *name;
22 int lineno;
25 typedef enum tristate {
26 no, mod, yes
27 } tristate;
29 enum expr_type {
30 E_NONE, E_OR, E_AND, E_NOT, E_EQUAL, E_UNEQUAL, E_LIST, E_SYMBOL, E_RANGE
33 union expr_data {
34 struct expr *expr;
35 struct symbol *sym;
38 struct expr {
39 enum expr_type type;
40 union expr_data left, right;
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))
47 #define expr_list_for_each_sym(l, e, s) \
48 for (e = (l); e && (s = e->right.sym); e = e->left.expr)
50 struct expr_value {
51 struct expr *expr;
52 tristate tri;
55 struct symbol_value {
56 void *val;
57 tristate tri;
60 enum symbol_type {
61 S_UNKNOWN, S_BOOLEAN, S_TRISTATE, S_INT, S_HEX, S_STRING, S_OTHER
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
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;
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)
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 */
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 */
107 #define SYMBOL_MAXLENGTH 256
108 #define SYMBOL_HASHSIZE 9973
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
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 */
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 */
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)
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;
172 #define MENU_CHANGED 0x0001
173 #define MENU_ROOT 0x0002
175 extern struct file *file_list;
176 extern struct file *current_file;
177 struct file *lookup_file(const char *name);
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);
206 void expr_fprint(struct expr *e, FILE *out);
207 struct gstr; /* forward */
208 void expr_gstr_print(struct expr *e, struct gstr *gs);
210 static inline int expr_is_yes(struct expr *e)
212 return !e || (e->type == E_SYMBOL && e->left.sym == &symbol_yes);
215 static inline int expr_is_no(struct expr *e)
217 return e && (e->type == E_SYMBOL && e->left.sym == &symbol_no);
220 #ifdef __cplusplus
222 #endif
224 #endif /* EXPR_H */