1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
4  */
5 
6 #ifndef EXPR_H
7 #define EXPR_H
8 
9 #ifdef __cplusplus
10 extern "C" {
11 #endif
12 
13 #include <assert.h>
14 #include <stdio.h>
15 #include "list.h"
16 #ifndef __cplusplus
17 #include <stdbool.h>
18 #endif
19 
20 struct file {
21 	struct file *next;
22 	struct file *parent;
23 	const char *name;
24 	int lineno;
25 };
26 
27 typedef enum tristate {
28 	no, mod, yes
29 } tristate;
30 
31 enum expr_type {
32 	E_NONE, E_OR, E_AND, E_NOT,
33 	E_EQUAL, E_UNEQUAL, E_LTH, E_LEQ, E_GTH, E_GEQ,
34 	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
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 /*
78  * Represents a configuration symbol.
79  *
80  * Choices are represented as a special kind of symbol and have the
81  * SYMBOL_CHOICE bit set in 'flags'.
82  */
83 struct symbol {
84 	/* The next symbol in the same bucket in the symbol hash table */
85 	struct symbol *next;
86 
87 	/* The name of the symbol, e.g. "FOO" for 'config FOO' */
88 	char *name;
89 
90 	/* S_BOOLEAN, S_TRISTATE, ... */
91 	enum symbol_type type;
92 
93 	/*
94 	 * The calculated value of the symbol. The SYMBOL_VALID bit is set in
95 	 * 'flags' when this is up to date. Note that this value might differ
96 	 * from the user value set in e.g. a .config file, due to visibility.
97 	 */
98 	struct symbol_value curr;
99 
100 	/*
101 	 * Values for the symbol provided from outside. def[S_DEF_USER] holds
102 	 * the .config value.
103 	 */
104 	struct symbol_value def[S_DEF_COUNT];
105 
106 	/*
107 	 * An upper bound on the tristate value the user can set for the symbol
108 	 * if it is a boolean or tristate. Calculated from prompt dependencies,
109 	 * which also inherit dependencies from enclosing menus, choices, and
110 	 * ifs. If 'n', the user value will be ignored.
111 	 *
112 	 * Symbols lacking prompts always have visibility 'n'.
113 	 */
114 	tristate visible;
115 
116 	/* SYMBOL_* flags */
117 	int flags;
118 
119 	/* List of properties. See prop_type. */
120 	struct property *prop;
121 
122 	/* Dependencies from enclosing menus, choices, and ifs */
123 	struct expr_value dir_dep;
124 
125 	/* Reverse dependencies through being selected by other symbols */
126 	struct expr_value rev_dep;
127 
128 	/*
129 	 * "Weak" reverse dependencies through being implied by other symbols
130 	 */
131 	struct expr_value implied;
132 };
133 
134 #define for_all_symbols(i, sym) for (i = 0; i < SYMBOL_HASHSIZE; i++) for (sym = symbol_hash[i]; sym; sym = sym->next)
135 
136 #define SYMBOL_CONST      0x0001  /* symbol is const */
137 #define SYMBOL_CHECK      0x0008  /* used during dependency checking */
138 #define SYMBOL_CHOICE     0x0010  /* start of a choice block (null name) */
139 #define SYMBOL_CHOICEVAL  0x0020  /* used as a value in a choice block */
140 #define SYMBOL_VALID      0x0080  /* set when symbol.curr is calculated */
141 #define SYMBOL_OPTIONAL   0x0100  /* choice is optional - values can be 'n' */
142 #define SYMBOL_WRITE      0x0200  /* write symbol to file (KCONFIG_CONFIG) */
143 #define SYMBOL_CHANGED    0x0400  /* ? */
144 #define SYMBOL_WRITTEN    0x0800  /* track info to avoid double-write to .config */
145 #define SYMBOL_NO_WRITE   0x1000  /* Symbol for internal use only; it will not be written */
146 #define SYMBOL_CHECKED    0x2000  /* used during dependency checking */
147 #define SYMBOL_WARNED     0x8000  /* warning has been issued */
148 
149 /* Set when symbol.def[] is used */
150 #define SYMBOL_DEF        0x10000  /* First bit of SYMBOL_DEF */
151 #define SYMBOL_DEF_USER   0x10000  /* symbol.def[S_DEF_USER] is valid */
152 #define SYMBOL_DEF_AUTO   0x20000  /* symbol.def[S_DEF_AUTO] is valid */
153 #define SYMBOL_DEF3       0x40000  /* symbol.def[S_DEF_3] is valid */
154 #define SYMBOL_DEF4       0x80000  /* symbol.def[S_DEF_4] is valid */
155 
156 /* choice values need to be set before calculating this symbol value */
157 #define SYMBOL_NEED_SET_CHOICE_VALUES  0x100000
158 
159 #define SYMBOL_MAXLENGTH	256
160 #define SYMBOL_HASHSIZE		9973
161 
162 /* A property represent the config options that can be associated
163  * with a config "symbol".
164  * Sample:
165  * config FOO
166  *         default y
167  *         prompt "foo prompt"
168  *         select BAR
169  * config BAZ
170  *         int "BAZ Value"
171  *         range 1..255
172  *
173  * Please, also check parser.y:print_symbol() when modifying the
174  * list of property types!
175  */
176 enum prop_type {
177 	P_UNKNOWN,
178 	P_PROMPT,   /* prompt "foo prompt" or "BAZ Value" */
179 	P_COMMENT,  /* text associated with a comment */
180 	P_MENU,     /* prompt associated with a menu or menuconfig symbol */
181 	P_DEFAULT,  /* default y */
182 	P_CHOICE,   /* choice value */
183 	P_SELECT,   /* select BAR */
184 	P_IMPLY,    /* imply BAR */
185 	P_RANGE,    /* range 7..100 (for a symbol) */
186 	P_SYMBOL,   /* where a symbol is defined */
187 };
188 
189 struct property {
190 	struct property *next;     /* next property - null if last */
191 	enum prop_type type;       /* type of property */
192 	const char *text;          /* the prompt value - P_PROMPT, P_MENU, P_COMMENT */
193 	struct expr_value visible;
194 	struct expr *expr;         /* the optional conditional part of the property */
195 	struct menu *menu;         /* the menu the property are associated with
196 	                            * valid for: P_SELECT, P_RANGE, P_CHOICE,
197 	                            * P_PROMPT, P_DEFAULT, P_MENU, P_COMMENT */
198 	struct file *file;         /* what file was this property defined */
199 	int lineno;                /* what lineno was this property defined */
200 };
201 
202 #define for_all_properties(sym, st, tok) \
203 	for (st = sym->prop; st; st = st->next) \
204 		if (st->type == (tok))
205 #define for_all_defaults(sym, st) for_all_properties(sym, st, P_DEFAULT)
206 #define for_all_choices(sym, st) for_all_properties(sym, st, P_CHOICE)
207 #define for_all_prompts(sym, st) \
208 	for (st = sym->prop; st; st = st->next) \
209 		if (st->text)
210 
211 /*
212  * Represents a node in the menu tree, as seen in e.g. menuconfig (though used
213  * for all front ends). Each symbol, menu, etc. defined in the Kconfig files
214  * gets a node. A symbol defined in multiple locations gets one node at each
215  * location.
216  */
217 struct menu {
218 	/* The next menu node at the same level */
219 	struct menu *next;
220 
221 	/* The parent menu node, corresponding to e.g. a menu or choice */
222 	struct menu *parent;
223 
224 	/* The first child menu node, for e.g. menus and choices */
225 	struct menu *list;
226 
227 	/*
228 	 * The symbol associated with the menu node. Choices are implemented as
229 	 * a special kind of symbol. NULL for menus, comments, and ifs.
230 	 */
231 	struct symbol *sym;
232 
233 	/*
234 	 * The prompt associated with the node. This holds the prompt for a
235 	 * symbol as well as the text for a menu or comment, along with the
236 	 * type (P_PROMPT, P_MENU, etc.)
237 	 */
238 	struct property *prompt;
239 
240 	/*
241 	 * 'visible if' dependencies. If more than one is given, they will be
242 	 * ANDed together.
243 	 */
244 	struct expr *visibility;
245 
246 	/*
247 	 * Ordinary dependencies from e.g. 'depends on' and 'if', ANDed
248 	 * together
249 	 */
250 	struct expr *dep;
251 
252 	/* MENU_* flags */
253 	unsigned int flags;
254 
255 	/* Any help text associated with the node */
256 	char *help;
257 
258 	/* The location where the menu node appears in the Kconfig files */
259 	struct file *file;
260 	int lineno;
261 
262 	/* For use by front ends that need to store auxiliary data */
263 	void *data;
264 };
265 
266 /*
267  * Set on a menu node when the corresponding symbol changes state in some way.
268  * Can be checked by front ends.
269  */
270 #define MENU_CHANGED		0x0001
271 
272 #define MENU_ROOT		0x0002
273 
274 struct jump_key {
275 	struct list_head entries;
276 	size_t offset;
277 	struct menu *target;
278 	int index;
279 };
280 
281 extern struct file *file_list;
282 extern struct file *current_file;
283 struct file *lookup_file(const char *name);
284 
285 extern struct symbol symbol_yes, symbol_no, symbol_mod;
286 extern struct symbol *modules_sym;
287 extern int cdebug;
288 struct expr *expr_alloc_symbol(struct symbol *sym);
289 struct expr *expr_alloc_one(enum expr_type type, struct expr *ce);
290 struct expr *expr_alloc_two(enum expr_type type, struct expr *e1, struct expr *e2);
291 struct expr *expr_alloc_comp(enum expr_type type, struct symbol *s1, struct symbol *s2);
292 struct expr *expr_alloc_and(struct expr *e1, struct expr *e2);
293 struct expr *expr_alloc_or(struct expr *e1, struct expr *e2);
294 struct expr *expr_copy(const struct expr *org);
295 void expr_free(struct expr *e);
296 void expr_eliminate_eq(struct expr **ep1, struct expr **ep2);
297 int expr_eq(struct expr *e1, struct expr *e2);
298 tristate expr_calc_value(struct expr *e);
299 struct expr *expr_trans_bool(struct expr *e);
300 struct expr *expr_eliminate_dups(struct expr *e);
301 struct expr *expr_transform(struct expr *e);
302 int expr_contains_symbol(struct expr *dep, struct symbol *sym);
303 bool expr_depends_symbol(struct expr *dep, struct symbol *sym);
304 struct expr *expr_trans_compare(struct expr *e, enum expr_type type, struct symbol *sym);
305 
306 void expr_fprint(struct expr *e, FILE *out);
307 struct gstr; /* forward */
308 void expr_gstr_print(struct expr *e, struct gstr *gs);
309 void expr_gstr_print_revdep(struct expr *e, struct gstr *gs,
310 			    tristate pr_type, const char *title);
311 
expr_is_yes(struct expr * e)312 static inline int expr_is_yes(struct expr *e)
313 {
314 	return !e || (e->type == E_SYMBOL && e->left.sym == &symbol_yes);
315 }
316 
expr_is_no(struct expr * e)317 static inline int expr_is_no(struct expr *e)
318 {
319 	return e && (e->type == E_SYMBOL && e->left.sym == &symbol_no);
320 }
321 
322 #ifdef __cplusplus
323 }
324 #endif
325 
326 #endif /* EXPR_H */
327