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95573cac25
Cache expression values to avoid recalculating them repeatedly. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
317 lines
8.7 KiB
C
317 lines
8.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
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*/
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#ifndef EXPR_H
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#define EXPR_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <assert.h>
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#include <stdio.h>
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#ifndef __cplusplus
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#include <stdbool.h>
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#endif
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#include <list_types.h>
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typedef enum tristate {
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no, mod, yes
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} tristate;
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enum expr_type {
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E_NONE, E_OR, E_AND, E_NOT,
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E_EQUAL, E_UNEQUAL, E_LTH, E_LEQ, E_GTH, E_GEQ,
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E_SYMBOL, E_RANGE
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};
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union expr_data {
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struct expr * const expr;
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struct symbol * const sym;
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void *_initdata;
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};
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/**
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* struct expr - expression
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*
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* @node: link node for the hash table
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* @type: expressoin type
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* @val: calculated tristate value
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* @val_is_valid: indicate whether the value is valid
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* @left: left node
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* @right: right node
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*/
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struct expr {
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struct hlist_node node;
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enum expr_type type;
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tristate val;
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bool val_is_valid;
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union expr_data left, right;
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};
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#define EXPR_OR(dep1, dep2) (((dep1)>(dep2))?(dep1):(dep2))
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#define EXPR_AND(dep1, dep2) (((dep1)<(dep2))?(dep1):(dep2))
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#define EXPR_NOT(dep) (2-(dep))
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struct expr_value {
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struct expr *expr;
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tristate tri;
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};
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struct symbol_value {
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void *val;
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tristate tri;
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};
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enum symbol_type {
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S_UNKNOWN, S_BOOLEAN, S_TRISTATE, S_INT, S_HEX, S_STRING
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};
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/* enum values are used as index to symbol.def[] */
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enum {
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S_DEF_USER, /* main user value */
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S_DEF_AUTO, /* values read from auto.conf */
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S_DEF_DEF3, /* Reserved for UI usage */
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S_DEF_DEF4, /* Reserved for UI usage */
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S_DEF_COUNT
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};
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/*
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* Represents a configuration symbol.
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*
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* Choices are represented as a special kind of symbol with null name.
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*
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* @choice_link: linked to menu::choice_members
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*/
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struct symbol {
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/* link node for the hash table */
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struct hlist_node node;
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/* The name of the symbol, e.g. "FOO" for 'config FOO' */
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char *name;
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/* S_BOOLEAN, S_TRISTATE, ... */
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enum symbol_type type;
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/*
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* The calculated value of the symbol. The SYMBOL_VALID bit is set in
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* 'flags' when this is up to date. Note that this value might differ
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* from the user value set in e.g. a .config file, due to visibility.
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*/
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struct symbol_value curr;
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/*
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* Values for the symbol provided from outside. def[S_DEF_USER] holds
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* the .config value.
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*/
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struct symbol_value def[S_DEF_COUNT];
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/*
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* An upper bound on the tristate value the user can set for the symbol
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* if it is a boolean or tristate. Calculated from prompt dependencies,
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* which also inherit dependencies from enclosing menus, choices, and
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* ifs. If 'n', the user value will be ignored.
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*
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* Symbols lacking prompts always have visibility 'n'.
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*/
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tristate visible;
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/* config entries associated with this symbol */
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struct list_head menus;
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struct list_head choice_link;
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/* SYMBOL_* flags */
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int flags;
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/* List of properties. See prop_type. */
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struct property *prop;
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/* Dependencies from enclosing menus, choices, and ifs */
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struct expr_value dir_dep;
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/* Reverse dependencies through being selected by other symbols */
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struct expr_value rev_dep;
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/*
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* "Weak" reverse dependencies through being implied by other symbols
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*/
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struct expr_value implied;
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};
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#define SYMBOL_CONST 0x0001 /* symbol is const */
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#define SYMBOL_CHECK 0x0008 /* used during dependency checking */
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#define SYMBOL_VALID 0x0080 /* set when symbol.curr is calculated */
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#define SYMBOL_WRITE 0x0200 /* write symbol to file (KCONFIG_CONFIG) */
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#define SYMBOL_WRITTEN 0x0800 /* track info to avoid double-write to .config */
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#define SYMBOL_CHECKED 0x2000 /* used during dependency checking */
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#define SYMBOL_WARNED 0x8000 /* warning has been issued */
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/* Set when symbol.def[] is used */
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#define SYMBOL_DEF 0x10000 /* First bit of SYMBOL_DEF */
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#define SYMBOL_DEF_USER 0x10000 /* symbol.def[S_DEF_USER] is valid */
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#define SYMBOL_DEF_AUTO 0x20000 /* symbol.def[S_DEF_AUTO] is valid */
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#define SYMBOL_DEF3 0x40000 /* symbol.def[S_DEF_3] is valid */
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#define SYMBOL_DEF4 0x80000 /* symbol.def[S_DEF_4] is valid */
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#define SYMBOL_MAXLENGTH 256
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/* A property represent the config options that can be associated
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* with a config "symbol".
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* Sample:
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* config FOO
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* default y
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* prompt "foo prompt"
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* select BAR
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* config BAZ
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* int "BAZ Value"
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* range 1..255
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*
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* Please, also check parser.y:print_symbol() when modifying the
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* list of property types!
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*/
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enum prop_type {
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P_UNKNOWN,
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P_PROMPT, /* prompt "foo prompt" or "BAZ Value" */
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P_COMMENT, /* text associated with a comment */
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P_MENU, /* prompt associated with a menu or menuconfig symbol */
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P_DEFAULT, /* default y */
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P_SELECT, /* select BAR */
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P_IMPLY, /* imply BAR */
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P_RANGE, /* range 7..100 (for a symbol) */
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};
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struct property {
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struct property *next; /* next property - null if last */
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enum prop_type type; /* type of property */
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const char *text; /* the prompt value - P_PROMPT, P_MENU, P_COMMENT */
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struct expr_value visible;
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struct expr *expr; /* the optional conditional part of the property */
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struct menu *menu; /* the menu the property are associated with
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* valid for: P_SELECT, P_RANGE,
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* P_PROMPT, P_DEFAULT, P_MENU, P_COMMENT */
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const char *filename; /* what file was this property defined */
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int lineno; /* what lineno was this property defined */
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};
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#define for_all_properties(sym, st, tok) \
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for (st = sym->prop; st; st = st->next) \
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if (st->type == (tok))
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#define for_all_defaults(sym, st) for_all_properties(sym, st, P_DEFAULT)
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#define for_all_prompts(sym, st) \
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for (st = sym->prop; st; st = st->next) \
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if (st->text)
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/*
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* Represents a node in the menu tree, as seen in e.g. menuconfig (though used
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* for all front ends). Each symbol, menu, etc. defined in the Kconfig files
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* gets a node. A symbol defined in multiple locations gets one node at each
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* location.
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*
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* @choice_members: list of choice members with priority.
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*/
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struct menu {
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/* The next menu node at the same level */
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struct menu *next;
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/* The parent menu node, corresponding to e.g. a menu or choice */
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struct menu *parent;
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/* The first child menu node, for e.g. menus and choices */
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struct menu *list;
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/*
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* The symbol associated with the menu node. Choices are implemented as
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* a special kind of symbol. NULL for menus, comments, and ifs.
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*/
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struct symbol *sym;
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struct list_head link; /* link to symbol::menus */
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struct list_head choice_members;
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/*
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* The prompt associated with the node. This holds the prompt for a
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* symbol as well as the text for a menu or comment, along with the
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* type (P_PROMPT, P_MENU, etc.)
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*/
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struct property *prompt;
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/*
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* 'visible if' dependencies. If more than one is given, they will be
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* ANDed together.
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*/
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struct expr *visibility;
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/*
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* Ordinary dependencies from e.g. 'depends on' and 'if', ANDed
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* together
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*/
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struct expr *dep;
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/* MENU_* flags */
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unsigned int flags;
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/* Any help text associated with the node */
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char *help;
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/* The location where the menu node appears in the Kconfig files */
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const char *filename;
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int lineno;
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/* For use by front ends that need to store auxiliary data */
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void *data;
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};
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/*
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* Set on a menu node when the corresponding symbol changes state in some way.
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* Can be checked by front ends.
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*/
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#define MENU_CHANGED 0x0001
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#define MENU_ROOT 0x0002
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struct jump_key {
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struct list_head entries;
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size_t offset;
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struct menu *target;
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};
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extern struct symbol symbol_yes, symbol_no, symbol_mod;
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extern struct symbol *modules_sym;
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extern int cdebug;
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struct expr *expr_alloc_symbol(struct symbol *sym);
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struct expr *expr_alloc_one(enum expr_type type, struct expr *ce);
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struct expr *expr_alloc_two(enum expr_type type, struct expr *e1, struct expr *e2);
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struct expr *expr_alloc_comp(enum expr_type type, struct symbol *s1, struct symbol *s2);
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struct expr *expr_alloc_and(struct expr *e1, struct expr *e2);
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struct expr *expr_alloc_or(struct expr *e1, struct expr *e2);
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void expr_eliminate_eq(struct expr **ep1, struct expr **ep2);
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bool expr_eq(struct expr *e1, struct expr *e2);
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tristate expr_calc_value(struct expr *e);
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struct expr *expr_eliminate_dups(struct expr *e);
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struct expr *expr_transform(struct expr *e);
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bool expr_contains_symbol(struct expr *dep, struct symbol *sym);
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bool expr_depends_symbol(struct expr *dep, struct symbol *sym);
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struct expr *expr_trans_compare(struct expr *e, enum expr_type type, struct symbol *sym);
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void expr_fprint(struct expr *e, FILE *out);
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struct gstr; /* forward */
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void expr_gstr_print(const struct expr *e, struct gstr *gs);
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void expr_gstr_print_revdep(struct expr *e, struct gstr *gs,
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tristate pr_type, const char *title);
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static inline bool expr_is_yes(const struct expr *e)
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{
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return !e || (e->type == E_SYMBOL && e->left.sym == &symbol_yes);
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* EXPR_H */
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