auto
     €ЖЕѓ}ЗЯДГВ %г    /* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
 */

#ifndef EXPR_H
#define EXPR_H

#ifdef __cplusplus
extern "C" {
#endif

#include <assert.h>
#include <stdio.h>
#include "list.h"
#ifndef __cplusplus
#include <stdbool.h>
#endif

struct file {
	struct file *next;
	struct file *parent;
	const char *name;
	int lineno;
};

typedef enum tristate {
	no, mod, yes
} tristate;

enum expr_type {
	E_NONE, E_OR, E_AND, E_NOT,
	E_EQUAL, E_UNEQUAL, E_LTH, E_LEQ, E_GTH, E_GEQ,
	E_LIST, E_SYMBOL, E_RANGE
};

union expr_data {
	struct expr *expr;
	struct symbol *sym;
};

struct expr {
	enum expr_type type;
	union expr_data left, right;
};

#define EXPR_OR(dep1, dep2)	(((dep1)>(dep2))?(dep1):(dep2))
#define EXPR_AND(dep1, dep2)	(((dep1)<(dep2))?(dep1):(dep2))
#define EXPR_NOT(dep)		(2-(dep))

#define expr_list_for_each_sym(l, e, s) \
	for (e = (l); e && (s = e->right.sym); e = e->left.expr)

struct expr_value {
	struct expr *expr;
	tristate tri;
};

struct symbol_value {
	void *val;
	tristate tri;
};

enum symbol_type {
	S_UNKNOWN, S_BOOLEAN, S_TRISTATE, S_INT, S_HEX, S_STRING
};

/* enum values are used as index to symbol.def[] */
enum {
	S_DEF_USER,		/* main user value */
	S_DEF_AUTO,		/* values read from auto.conf */
	S_DEF_DEF3,		/* Reserved for UI usage */
	S_DEF_DEF4,		/* Reserved for UI usage */
	S_DEF_COUNT
};

/*
 * Represents a configuration symbol.
 *
 * Choices are represented as a special kind of symbol and have the
 * SYMBOL_CHOICE bit set in 'flags'.
 */
struct symbol {
	/* The next symbol in the same bucket in the symbol hash table */
	struct symbol *next;

	/* The name of the symbol, e.g. "FOO" for 'config FOO' */
	char *name;

	/* S_BOOLEAN, S_TRISTATE, ... */
	enum symbol_type type;

	/*
	 * The calculated value of the symbol. The SYMBOL_VALID bit is set in
	 * 'flags' when this is up to date. Note that this value might differ
	 * from the user value set in e.g. a .config file, due to visibility.
	 */
	struct symbol_value curr;

	/*
	 * Values for the symbol provided from outside. def[S_DEF_USER] holds
	 * the .config value.
	 */
	struct symbol_value def[S_DEF_COUNT];

	/*
	 * An upper bound on the tristate value the user can set for the symbol
	 * if it is a boolean or tristate. Calculated from prompt dependencies,
	 * which also inherit dependencies from enclosing menus, choices, and
	 * ifs. If 'n', the user value will be ignored.
	 *
	 * Symbols lacking prompts always have visibility 'n'.
	 */
	tristate visible;

	/* SYMBOL_* flags */
	int flags;

	/* List of properties. See prop_type. */
	struct property *prop;

	/* Dependencies from enclosing menus, choices, and ifs */
	struct expr_value dir_dep;

	/* Reverse dependencies through being selected by other symbols */
	struct expr_value rev_dep;

	/*
	 * "Weak" reverse dependencies through being implied by other symbols
	 */
	struct expr_value implied;
};

#define for_all_symbols(i, sym) for (i = 0; i < SYMBOL_HASHSIZE; i++) for (sym = symbol_hash[i]; sym; sym = sym->next)

#define SYMBOL_CONST      0x0001  /* symbol is const */
#define SYMBOL_CHECK      0x0008  /* used during dependency checking */
#define SYMBOL_CHOICE     0x0010  /* start of a choice block (null name) */
#define SYMBOL_CHOICEVAL  0x0020  /* used as a value in a choice block */
#define SYMBOL_VALID      0x0080  /* set when symbol.curr is calculated */
#define SYMBOL_OPTIONAL   0x0100  /* choice is optional - values can be 'n' */
#define SYMBOL_WRITE      0x0200  /* write symbol to file (KCONFIG_CONFIG) */
#define SYMBOL_CHANGED    0x0400  /* ? */
#define SYMBOL_WRITTEN    0x0800  /* track info to avoid double-write to .config */
#define SYMBOL_NO_WRITE   0x1000  /* Symbol for internal use only; it will not be written */
#define SYMBOL_CHECKED    0x2000  /* used during dependency checking */
#define SYMBOL_WARNED     0x8000  /* warning has been issued */

/* Set when symbol.def[] is used */
#define SYMBOL_DEF        0x10000  /* First bit of SYMBOL_DEF */
#define SYMBOL_DEF_USER   0x10000  /* symbol.def[S_DEF_USER