kconfig: show '?' prompt even if no help text is available

[carl9170fw.git] / config / expr.h

diff --git a/config/expr.h b/config/expr.h
index a2fc96a2bd2cf84115b8009b097ea772ab53dcdf..c16e82e302a2de32d0101cb4fb535894f1fc0ec2 100644 (file)
--- a/config/expr.h
+++ b/config/expr.h
@@ -29,7 +29,9 @@ typedef enum tristate {
 } tristate;
 
 enum expr_type {
-       E_NONE, E_OR, E_AND, E_NOT, E_EQUAL, E_UNEQUAL, E_LIST, E_SYMBOL, E_RANGE
+       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 {
@@ -72,17 +74,61 @@ enum {
        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) if (sym->type != S_OTHER)
@@ -130,10 +176,11 @@ enum prop_type {
        P_UNKNOWN,
        P_PROMPT,   /* prompt "foo prompt" or "BAZ Value" */
        P_COMMENT,  /* text associated with a comment */
-       P_MENU,     /* prompt associated with a menuconfig option */
+       P_MENU,     /* prompt associated with a menu or menuconfig symbol */
        P_DEFAULT,  /* default y */
        P_CHOICE,   /* choice value */
        P_SELECT,   /* select BAR */
+       P_IMPLY,    /* imply BAR */
        P_RANGE,    /* range 7..100 (for a symbol) */
        P_ENV,      /* value from environment variable */
        P_SYMBOL,   /* where a symbol is defined */
@@ -162,22 +209,67 @@ struct property {
        for (st = sym->prop; st; st = st->next) \
                if (st->text)
 
+/*
+ * Represents a node in the menu tree, as seen in e.g. menuconfig (though used
+ * for all front ends). Each symbol, menu, etc. defined in the Kconfig files
+ * gets a node. A symbol defined in multiple locations gets one node at each
+ * location.
+ */
 struct menu {
+       /* The next menu node at the same level */
        struct menu *next;
+
+       /* The parent menu node, corresponding to e.g. a menu or choice */
        struct menu *parent;
+
+       /* The first child menu node, for e.g. menus and choices */
        struct menu *list;
+
+       /*
+        * The symbol associated with the menu node. Choices are implemented as
+        * a special kind of symbol. NULL for menus, comments, and ifs.
+        */
        struct symbol *sym;
+
+       /*
+        * The prompt associated with the node. This holds the prompt for a
+        * symbol as well as the text for a menu or comment, along with the
+        * type (P_PROMPT, P_MENU, etc.)
+        */
        struct property *prompt;
+
+       /*
+        * 'visible if' dependencies. If more than one is given, they will be
+        * ANDed together.
+        */
        struct expr *visibility;
+
+       /*
+        * Ordinary dependencies from e.g. 'depends on' and 'if', ANDed
+        * together
+        */
        struct expr *dep;
+
+       /* MENU_* flags */
        unsigned int flags;
+
+       /* Any help text associated with the node */
        char *help;
+
+       /* The location where the menu node appears in the Kconfig files */
        struct file *file;
        int lineno;
+
+       /* For use by front ends that need to store auxiliary data */
        void *data;
 };
 
+/*
+ * Set on a menu node when the corresponding symbol changes state in some way.
+ * Can be checked by front ends.
+ */
 #define MENU_CHANGED           0x0001
+
 #define MENU_ROOT              0x0002
 
 struct jump_key {
@@ -218,6 +310,7 @@ struct expr *expr_simplify_unmet_dep(struct expr *e1, struct expr *e2);
 void expr_fprint(struct expr *e, FILE *out);
 struct gstr; /* forward */
 void expr_gstr_print(struct expr *e, struct gstr *gs);
+void expr_gstr_print_revdep(struct expr *e, struct gstr *gs);
 
 static inline int expr_is_yes(struct expr *e)
 {