expr.h

/*
 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
 * Released under the terms of the GNU GPL v2.0.
 */

#ifndef EXPR_H
#define EXPR_H

#ifdef __cplusplus
extern "C" {
#endif

#include <stdio.h>
#ifndef __cplusplus
#include <stdbool.h>
#endif

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

#define FILE_BUSY		0x0001
#define FILE_SCANNED		0x0002

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

enum expr_type {
	E_NONE, E_OR, E_AND, E_NOT, E_EQUAL, E_UNEQUAL, 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, S_OTHER
};

/* enum values are used as index to symbol.def[] */
enum {
	S_DEF_USER,		/* main user value */