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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (C) 2002 Roman Zippel <[email protected]>
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
19#include <list_types.h>
20
21typedef enum tristate {
22 no, mod, yes
23} tristate;
24
25enum 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
31union 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: expression 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 */
47struct 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
59struct expr_value {
60 struct expr *expr;
61 tristate tri;
62};
63
64struct symbol_value {
65 void *val;
66 tristate tri;
67};
68
69enum 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[] */
74enum {
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 */
89struct 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_TRANS 0x0100 /* symbol is transitional only (not visible)*/
149#define SYMBOL_WRITE 0x0200 /* write symbol to file (KCONFIG_CONFIG) */
150#define SYMBOL_WRITTEN 0x0800 /* track info to avoid double-write to .config */
151#define SYMBOL_CHECKED 0x2000 /* used during dependency checking */
152#define SYMBOL_WARNED 0x8000 /* warning has been issued */
153
154/* Set when symbol.def[] is used */
155#define SYMBOL_DEF 0x10000 /* First bit of SYMBOL_DEF */
156#define SYMBOL_DEF_USER 0x10000 /* symbol.def[S_DEF_USER] is valid */
157#define SYMBOL_DEF_AUTO 0x20000 /* symbol.def[S_DEF_AUTO] is valid */
158#define SYMBOL_DEF3 0x40000 /* symbol.def[S_DEF_3] is valid */
159#define SYMBOL_DEF4 0x80000 /* symbol.def[S_DEF_4] is valid */
160
161#define SYMBOL_MAXLENGTH 256
162
163/* A property represents the config options that can be associated
164 * with a config "symbol".
165 * Sample:
166 * config FOO
167 * default y
168 * prompt "foo prompt"
169 * select BAR
170 * config BAZ
171 * int "BAZ Value"
172 * range 1..255
173 *
174 * Please, also check parser.y:print_symbol() when modifying the
175 * list of property types!
176 */
177enum prop_type {
178 P_UNKNOWN,
179 P_PROMPT, /* prompt "foo prompt" or "BAZ Value" */
180 P_COMMENT, /* text associated with a comment */
181 P_MENU, /* prompt associated with a menu or menuconfig symbol */
182 P_DEFAULT, /* default y */
183 P_SELECT, /* select BAR */
184 P_IMPLY, /* imply BAR */
185 P_RANGE, /* range 7..100 (for a symbol) */
186};
187
188struct property {
189 struct property *next; /* next property - null if last */
190 enum prop_type type; /* type of property */
191 const char *text; /* the prompt value - P_PROMPT, P_MENU, P_COMMENT */
192 struct expr_value visible;
193 struct expr *expr; /* the optional conditional part of the property */
194 struct menu *menu; /* the menu the property are associated with
195 * valid for: P_SELECT, P_RANGE,
196 * P_PROMPT, P_DEFAULT, P_MENU, P_COMMENT */
197 const char *filename; /* what file was this property defined */
198 int lineno; /* what lineno was this property defined */
199};
200
201#define for_all_properties(sym, st, tok) \
202 for (st = sym->prop; st; st = st->next) \
203 if (st->type == (tok))
204#define for_all_defaults(sym, st) for_all_properties(sym, st, P_DEFAULT)
205#define for_all_prompts(sym, st) \
206 for (st = sym->prop; st; st = st->next) \
207 if (st->text)
208
209enum menu_type {
210 M_CHOICE, // "choice"
211 M_COMMENT, // "comment"
212 M_IF, // "if"
213 M_MENU, // "mainmenu", "menu", "menuconfig"
214 M_NORMAL, // others, i.e., "config"
215};
216
217/*
218 * Represents a node in the menu tree, as seen in e.g. menuconfig (though used
219 * for all front ends). Each symbol, menu, etc. defined in the Kconfig files
220 * gets a node. A symbol defined in multiple locations gets one node at each
221 * location.
222 *
223 * @type: type of the menu entry
224 * @choice_members: list of choice members with priority.
225 */
226struct menu {
227 enum menu_type type;
228
229 /* The next menu node at the same level */
230 struct menu *next;
231
232 /* The parent menu node, corresponding to e.g. a menu or choice */
233 struct menu *parent;
234
235 /* The first child menu node, for e.g. menus and choices */
236 struct menu *list;
237
238 /*
239 * The symbol associated with the menu node. Choices are implemented as
240 * a special kind of symbol. NULL for menus, comments, and ifs.
241 */
242 struct symbol *sym;
243
244 struct list_head link; /* link to symbol::menus */
245
246 struct list_head choice_members;
247
248 /*
249 * The prompt associated with the node. This holds the prompt for a
250 * symbol as well as the text for a menu or comment, along with the
251 * type (P_PROMPT, P_MENU, etc.)
252 */
253 struct property *prompt;
254
255 /*
256 * 'visible if' dependencies. If more than one is given, they will be
257 * ANDed together.
258 */
259 struct expr *visibility;
260
261 /*
262 * Ordinary dependencies from e.g. 'depends on' and 'if', ANDed
263 * together
264 */
265 struct expr *dep;
266
267 /* MENU_* flags */
268 unsigned int flags;
269
270 /* Any help text associated with the node */
271 char *help;
272
273 /* The location where the menu node appears in the Kconfig files */
274 const char *filename;
275 int lineno;
276
277 /* For use by front ends that need to store auxiliary data */
278 void *data;
279};
280
281/*
282 * Set on a menu node when the corresponding symbol changes state in some way.
283 * Can be checked by front ends.
284 */
285#define MENU_CHANGED 0x0001
286
287#define MENU_ROOT 0x0002
288
289struct jump_key {
290 struct list_head entries;
291 size_t offset;
292 struct menu *target;
293};
294
295extern struct symbol symbol_yes, symbol_no, symbol_mod;
296extern struct symbol *modules_sym;
297extern int cdebug;
298struct expr *expr_alloc_symbol(struct symbol *sym);
299struct expr *expr_alloc_one(enum expr_type type, struct expr *ce);
300struct expr *expr_alloc_two(enum expr_type type, struct expr *e1, struct expr *e2);
301struct expr *expr_alloc_comp(enum expr_type type, struct symbol *s1, struct symbol *s2);
302struct expr *expr_alloc_and(struct expr *e1, struct expr *e2);
303struct expr *expr_alloc_or(struct expr *e1, struct expr *e2);
304void expr_eliminate_eq(struct expr **ep1, struct expr **ep2);
305bool expr_eq(struct expr *e1, struct expr *e2);
306tristate expr_calc_value(struct expr *e);
307struct expr *expr_eliminate_dups(struct expr *e);
308struct expr *expr_transform(struct expr *e);
309bool expr_contains_symbol(struct expr *dep, struct symbol *sym);
310bool expr_contains_symbol_negated(struct expr *dep, struct symbol *sym);
311bool expr_depends_symbol(struct expr *dep, struct symbol *sym);
312struct expr *expr_trans_compare(struct expr *e, enum expr_type type, struct symbol *sym);
313
314void expr_fprint(struct expr *e, FILE *out);
315struct gstr; /* forward */
316void expr_gstr_print(const struct expr *e, struct gstr *gs);
317void expr_gstr_print_revdep(struct expr *e, struct gstr *gs,
318 tristate pr_type, const char *title);
319
320static inline bool expr_is_yes(const struct expr *e)
321{
322 return !e || (e->type == E_SYMBOL && e->left.sym == &symbol_yes);
323}
324
325#ifdef __cplusplus
326}
327#endif
328
329#endif /* EXPR_H */