mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-12-28 16:56:26 +00:00
kconfig: use hash table to reuse expressions
Currently, every expression in Kconfig files produces a new abstract
syntax tree (AST), even if it is identical to a previously encountered
one.
Consider the following code:
config FOO
bool "FOO"
depends on (A || B) && C
config BAR
bool "BAR"
depends on (A || B) && C
config BAZ
bool "BAZ"
depends on A || B
The "depends on" lines are similar, but currently a separate AST is
allocated for each one.
The current data structure looks like this:
FOO->dep ==> AND BAR->dep ==> AND BAZ->dep ==> OR
/ \ / \ / \
OR C OR C A B
/ \ / \
A B A B
This is redundant; FOO->dep and BAR->dep have identical ASTs but
different memory instances.
We can optimize this; FOO->dep and BAR->dep can share the same AST, and
BAZ->dep can reference its sub tree.
The optimized data structure looks like this:
FOO->dep, BAR->dep ==> AND
/ \
BAZ->dep ==> OR C
/ \
A B
This commit introduces a hash table to keep track of allocated
expressions. If an identical expression is found, it is reused.
This does not necessarily result in memory savings, as menu_finalize()
transforms expressions without freeing up stale ones. This will be
addressed later.
One optimization that can be easily implemented is caching the
expression's value. Once FOO's dependency, (A || B) && C, is calculated,
it can be cached, eliminating the need to recalculate it for BAR.
This commit also reverts commit e983b7b17a ("kconfig/menu.c: fix
multiple references to expressions in menu_add_prop()").
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Masahiro Yamada
parent
440f67ccdc
commit
f93d6bfbd2
@ -12,4 +12,17 @@ static inline unsigned int hash_str(const char *s)
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return hash;
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}
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/* simplified version of functions from include/linux/hash.h */
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#define GOLDEN_RATIO_32 0x61C88647
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static inline unsigned int hash_32(unsigned int val)
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{
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return 0x61C88647 * val;
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}
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static inline unsigned int hash_ptr(const void *ptr)
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{
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return hash_32((unsigned int)(unsigned long)ptr);
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}
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#endif /* HASH_H */
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@ -9,45 +9,68 @@
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#include <stdlib.h>
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#include <string.h>
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#include <hash.h>
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#include <xalloc.h>
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#include "internal.h"
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#include "lkc.h"
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#define DEBUG_EXPR 0
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HASHTABLE_DEFINE(expr_hashtable, EXPR_HASHSIZE);
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static struct expr *expr_eliminate_yn(struct expr *e);
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/**
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* expr_lookup - return the expression with the given type and sub-nodes
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* This looks up an expression with the specified type and sub-nodes. If such
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* an expression is found in the hash table, it is returned. Otherwise, a new
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* expression node is allocated and added to the hash table.
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* @type: expression type
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* @l: left node
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* @r: right node
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* return: expression
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*/
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static struct expr *expr_lookup(enum expr_type type, void *l, void *r)
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{
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struct expr *e;
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int hash;
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hash = hash_32((unsigned int)type ^ hash_ptr(l) ^ hash_ptr(r));
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hash_for_each_possible(expr_hashtable, e, node, hash) {
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if (e->type == type && e->left._initdata == l &&
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e->right._initdata == r)
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return e;
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}
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e = xmalloc(sizeof(*e));
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e->type = type;
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e->left._initdata = l;
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e->right._initdata = r;
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hash_add(expr_hashtable, &e->node, hash);
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return e;
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}
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struct expr *expr_alloc_symbol(struct symbol *sym)
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{
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struct expr *e = xcalloc(1, sizeof(*e));
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e->type = E_SYMBOL;
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e->left.sym = sym;
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return e;
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return expr_lookup(E_SYMBOL, sym, NULL);
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}
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struct expr *expr_alloc_one(enum expr_type type, struct expr *ce)
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{
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struct expr *e = xcalloc(1, sizeof(*e));
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e->type = type;
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e->left.expr = ce;
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return e;
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return expr_lookup(type, ce, NULL);
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}
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struct expr *expr_alloc_two(enum expr_type type, struct expr *e1, struct expr *e2)
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{
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struct expr *e = xcalloc(1, sizeof(*e));
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e->type = type;
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e->left.expr = e1;
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e->right.expr = e2;
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return e;
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return expr_lookup(type, e1, e2);
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}
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struct expr *expr_alloc_comp(enum expr_type type, struct symbol *s1, struct symbol *s2)
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{
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struct expr *e = xcalloc(1, sizeof(*e));
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e->type = type;
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e->left.sym = s1;
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e->right.sym = s2;
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return e;
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return expr_lookup(type, s1, s2);
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}
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struct expr *expr_alloc_and(struct expr *e1, struct expr *e2)
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@ -64,76 +87,6 @@ struct expr *expr_alloc_or(struct expr *e1, struct expr *e2)
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return e2 ? expr_alloc_two(E_OR, e1, e2) : e1;
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}
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struct expr *expr_copy(const struct expr *org)
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{
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struct expr *e;
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if (!org)
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return NULL;
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e = xmalloc(sizeof(*org));
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memcpy(e, org, sizeof(*org));
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switch (org->type) {
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case E_SYMBOL:
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e->left = org->left;
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break;
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case E_NOT:
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e->left.expr = expr_copy(org->left.expr);
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break;
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case E_EQUAL:
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case E_GEQ:
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case E_GTH:
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case E_LEQ:
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case E_LTH:
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case E_UNEQUAL:
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e->left.sym = org->left.sym;
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e->right.sym = org->right.sym;
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break;
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case E_AND:
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case E_OR:
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e->left.expr = expr_copy(org->left.expr);
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e->right.expr = expr_copy(org->right.expr);
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break;
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default:
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fprintf(stderr, "can't copy type %d\n", e->type);
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free(e);
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e = NULL;
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break;
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}
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return e;
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}
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void expr_free(struct expr *e)
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{
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if (!e)
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return;
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switch (e->type) {
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case E_SYMBOL:
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break;
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case E_NOT:
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expr_free(e->left.expr);
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break;
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case E_EQUAL:
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case E_GEQ:
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case E_GTH:
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case E_LEQ:
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case E_LTH:
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case E_UNEQUAL:
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break;
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case E_OR:
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case E_AND:
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expr_free(e->left.expr);
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expr_free(e->right.expr);
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break;
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default:
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fprintf(stderr, "how to free type %d?\n", e->type);
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break;
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}
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free(e);
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}
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static int trans_count;
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/*
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@ -146,16 +99,24 @@ static int trans_count;
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*/
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static void __expr_eliminate_eq(enum expr_type type, struct expr **ep1, struct expr **ep2)
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{
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struct expr *l, *r;
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/* Recurse down to leaves */
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if ((*ep1)->type == type) {
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__expr_eliminate_eq(type, &(*ep1)->left.expr, ep2);
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__expr_eliminate_eq(type, &(*ep1)->right.expr, ep2);
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l = (*ep1)->left.expr;
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r = (*ep1)->right.expr;
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__expr_eliminate_eq(type, &l, ep2);
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__expr_eliminate_eq(type, &r, ep2);
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*ep1 = expr_alloc_two(type, l, r);
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return;
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}
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if ((*ep2)->type == type) {
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__expr_eliminate_eq(type, ep1, &(*ep2)->left.expr);
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__expr_eliminate_eq(type, ep1, &(*ep2)->right.expr);
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l = (*ep2)->left.expr;
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r = (*ep2)->right.expr;
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__expr_eliminate_eq(type, ep1, &l);
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__expr_eliminate_eq(type, ep1, &r);
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*ep2 = expr_alloc_two(type, l, r);
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return;
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}
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@ -171,7 +132,6 @@ static void __expr_eliminate_eq(enum expr_type type, struct expr **ep1, struct e
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/* *ep1 and *ep2 are equal leaves. Prepare them for elimination. */
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trans_count++;
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expr_free(*ep1); expr_free(*ep2);
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switch (type) {
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case E_OR:
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*ep1 = expr_alloc_symbol(&symbol_no);
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@ -271,14 +231,10 @@ bool expr_eq(struct expr *e1, struct expr *e2)
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return expr_eq(e1->left.expr, e2->left.expr);
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case E_AND:
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case E_OR:
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e1 = expr_copy(e1);
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e2 = expr_copy(e2);
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old_count = trans_count;
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expr_eliminate_eq(&e1, &e2);
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res = (e1->type == E_SYMBOL && e2->type == E_SYMBOL &&
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e1->left.sym == e2->left.sym);
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expr_free(e1);
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expr_free(e2);
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trans_count = old_count;
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return res;
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case E_RANGE:
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@ -297,7 +253,7 @@ bool expr_eq(struct expr *e1, struct expr *e2)
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}
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/*
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* Recursively performs the following simplifications in-place (as well as the
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* Recursively performs the following simplifications (as well as the
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* corresponding simplifications with swapped operands):
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*
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* expr && n -> n
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@ -309,79 +265,39 @@ bool expr_eq(struct expr *e1, struct expr *e2)
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*/
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static struct expr *expr_eliminate_yn(struct expr *e)
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{
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struct expr *tmp;
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struct expr *l, *r;
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if (e) switch (e->type) {
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case E_AND:
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e->left.expr = expr_eliminate_yn(e->left.expr);
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e->right.expr = expr_eliminate_yn(e->right.expr);
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if (e->left.expr->type == E_SYMBOL) {
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if (e->left.expr->left.sym == &symbol_no) {
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expr_free(e->left.expr);
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expr_free(e->right.expr);
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e->type = E_SYMBOL;
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e->left.sym = &symbol_no;
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e->right.expr = NULL;
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return e;
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} else if (e->left.expr->left.sym == &symbol_yes) {
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free(e->left.expr);
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tmp = e->right.expr;
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*e = *(e->right.expr);
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free(tmp);
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return e;
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}
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l = expr_eliminate_yn(e->left.expr);
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r = expr_eliminate_yn(e->right.expr);
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if (l->type == E_SYMBOL) {
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if (l->left.sym == &symbol_no)
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return l;
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else if (l->left.sym == &symbol_yes)
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return r;
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}
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if (e->right.expr->type == E_SYMBOL) {
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if (e->right.expr->left.sym == &symbol_no) {
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expr_free(e->left.expr);
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expr_free(e->right.expr);
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e->type = E_SYMBOL;
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e->left.sym = &symbol_no;
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e->right.expr = NULL;
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return e;
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} else if (e->right.expr->left.sym == &symbol_yes) {
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free(e->right.expr);
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tmp = e->left.expr;
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*e = *(e->left.expr);
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free(tmp);
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return e;
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}
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if (r->type == E_SYMBOL) {
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if (r->left.sym == &symbol_no)
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return r;
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else if (r->left.sym == &symbol_yes)
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return l;
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}
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break;
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case E_OR:
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e->left.expr = expr_eliminate_yn(e->left.expr);
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e->right.expr = expr_eliminate_yn(e->right.expr);
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if (e->left.expr->type == E_SYMBOL) {
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if (e->left.expr->left.sym == &symbol_no) {
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free(e->left.expr);
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tmp = e->right.expr;
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*e = *(e->right.expr);
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free(tmp);
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return e;
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} else if (e->left.expr->left.sym == &symbol_yes) {
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expr_free(e->left.expr);
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expr_free(e->right.expr);
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e->type = E_SYMBOL;
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e->left.sym = &symbol_yes;
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e->right.expr = NULL;
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return e;
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}
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l = expr_eliminate_yn(e->left.expr);
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r = expr_eliminate_yn(e->right.expr);
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if (l->type == E_SYMBOL) {
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if (l->left.sym == &symbol_no)
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return r;
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else if (l->left.sym == &symbol_yes)
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return l;
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}
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if (e->right.expr->type == E_SYMBOL) {
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if (e->right.expr->left.sym == &symbol_no) {
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free(e->right.expr);
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tmp = e->left.expr;
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*e = *(e->left.expr);
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free(tmp);
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return e;
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} else if (e->right.expr->left.sym == &symbol_yes) {
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expr_free(e->left.expr);
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expr_free(e->right.expr);
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e->type = E_SYMBOL;
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e->left.sym = &symbol_yes;
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e->right.expr = NULL;
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return e;
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}
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if (r->type == E_SYMBOL) {
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if (r->left.sym == &symbol_no)
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return l;
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else if (r->left.sym == &symbol_yes)
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return r;
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}
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break;
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default:
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@ -399,7 +315,7 @@ static struct expr *expr_join_or(struct expr *e1, struct expr *e2)
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struct symbol *sym1, *sym2;
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if (expr_eq(e1, e2))
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return expr_copy(e1);
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return e1;
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if (e1->type != E_EQUAL && e1->type != E_UNEQUAL && e1->type != E_SYMBOL && e1->type != E_NOT)
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return NULL;
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if (e2->type != E_EQUAL && e2->type != E_UNEQUAL && e2->type != E_SYMBOL && e2->type != E_NOT)
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@ -464,7 +380,7 @@ static struct expr *expr_join_and(struct expr *e1, struct expr *e2)
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struct symbol *sym1, *sym2;
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if (expr_eq(e1, e2))
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return expr_copy(e1);
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return e1;
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if (e1->type != E_EQUAL && e1->type != E_UNEQUAL && e1->type != E_SYMBOL && e1->type != E_NOT)
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return NULL;
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if (e2->type != E_EQUAL && e2->type != E_UNEQUAL && e2->type != E_SYMBOL && e2->type != E_NOT)
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@ -561,18 +477,24 @@ static struct expr *expr_join_and(struct expr *e1, struct expr *e2)
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*/
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static void expr_eliminate_dups1(enum expr_type type, struct expr **ep1, struct expr **ep2)
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{
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struct expr *tmp;
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struct expr *tmp, *l, *r;
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/* Recurse down to leaves */
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if ((*ep1)->type == type) {
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expr_eliminate_dups1(type, &(*ep1)->left.expr, ep2);
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expr_eliminate_dups1(type, &(*ep1)->right.expr, ep2);
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l = (*ep1)->left.expr;
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r = (*ep1)->right.expr;
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expr_eliminate_dups1(type, &l, ep2);
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expr_eliminate_dups1(type, &r, ep2);
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*ep1 = expr_alloc_two(type, l, r);
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return;
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}
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if ((*ep2)->type == type) {
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expr_eliminate_dups1(type, ep1, &(*ep2)->left.expr);
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expr_eliminate_dups1(type, ep1, &(*ep2)->right.expr);
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l = (*ep2)->left.expr;
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r = (*ep2)->right.expr;
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expr_eliminate_dups1(type, ep1, &l);
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expr_eliminate_dups1(type, ep1, &r);
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*ep2 = expr_alloc_two(type, l, r);
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return;
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}
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@ -582,7 +504,6 @@ static void expr_eliminate_dups1(enum expr_type type, struct expr **ep1, struct
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case E_OR:
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tmp = expr_join_or(*ep1, *ep2);
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if (tmp) {
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expr_free(*ep1); expr_free(*ep2);
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*ep1 = expr_alloc_symbol(&symbol_no);
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*ep2 = tmp;
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trans_count++;
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@ -591,7 +512,6 @@ static void expr_eliminate_dups1(enum expr_type type, struct expr **ep1, struct
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case E_AND:
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tmp = expr_join_and(*ep1, *ep2);
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if (tmp) {
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expr_free(*ep1); expr_free(*ep2);
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*ep1 = expr_alloc_symbol(&symbol_yes);
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*ep2 = tmp;
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trans_count++;
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@ -621,12 +541,15 @@ struct expr *expr_eliminate_dups(struct expr *e)
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oldcount = trans_count;
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do {
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struct expr *l, *r;
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trans_count = 0;
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switch (e->type) {
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case E_OR: case E_AND:
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e->left.expr = expr_eliminate_dups(e->left.expr);
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e->right.expr = expr_eliminate_dups(e->right.expr);
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expr_eliminate_dups1(e->type, &e->left.expr, &e->right.expr);
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l = expr_eliminate_dups(e->left.expr);
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r = expr_eliminate_dups(e->right.expr);
|
||||
expr_eliminate_dups1(e->type, &l, &r);
|
||||
e = expr_alloc_two(e->type, l, r);
|
||||
default:
|
||||
;
|
||||
}
|
||||
@ -668,8 +591,6 @@ struct expr *expr_eliminate_dups(struct expr *e)
|
||||
*/
|
||||
struct expr *expr_transform(struct expr *e)
|
||||
{
|
||||
struct expr *tmp;
|
||||
|
||||
if (!e)
|
||||
return NULL;
|
||||
switch (e->type) {
|
||||
@ -682,8 +603,9 @@ struct expr *expr_transform(struct expr *e)
|
||||
case E_SYMBOL:
|
||||
break;
|
||||
default:
|
||||
e->left.expr = expr_transform(e->left.expr);
|
||||
e->right.expr = expr_transform(e->right.expr);
|
||||
e = expr_alloc_two(e->type,
|
||||
expr_transform(e->left.expr),
|
||||
expr_transform(e->right.expr));
|
||||
}
|
||||
|
||||
switch (e->type) {
|
||||
@ -692,23 +614,18 @@ struct expr *expr_transform(struct expr *e)
|
||||
break;
|
||||
if (e->right.sym == &symbol_no) {
|
||||
// A=n -> !A
|
||||
e->type = E_NOT;
|
||||
e->left.expr = expr_alloc_symbol(e->left.sym);
|
||||
e->right.sym = NULL;
|
||||
e = expr_alloc_one(E_NOT, expr_alloc_symbol(e->left.sym));
|
||||
break;
|
||||
}
|
||||
if (e->right.sym == &symbol_mod) {
|
||||
// A=m -> n
|
||||
printf("boolean symbol %s tested for 'm'? test forced to 'n'\n", e->left.sym->name);
|
||||
e->type = E_SYMBOL;
|
||||
e->left.sym = &symbol_no;
|
||||
e->right.sym = NULL;
|
||||
e = expr_alloc_symbol(&symbol_no);
|
||||
break;
|
||||
}
|
||||
if (e->right.sym == &symbol_yes) {
|
||||
// A=y -> A
|
||||
e->type = E_SYMBOL;
|
||||
e->right.sym = NULL;
|
||||
e = expr_alloc_symbol(e->left.sym);
|
||||
break;
|
||||
}
|
||||
break;
|
||||
@ -717,23 +634,18 @@ struct expr *expr_transform(struct expr *e)
|
||||
break;
|
||||
if (e->right.sym == &symbol_no) {
|
||||
// A!=n -> A
|
||||
e->type = E_SYMBOL;
|
||||
e->right.sym = NULL;
|
||||
e = expr_alloc_symbol(e->left.sym);
|
||||
break;
|
||||
}
|
||||
if (e->right.sym == &symbol_mod) {
|
||||
// A!=m -> y
|
||||
printf("boolean symbol %s tested for 'm'? test forced to 'y'\n", e->left.sym->name);
|
||||
e->type = E_SYMBOL;
|
||||
e->left.sym = &symbol_yes;
|
||||
e->right.sym = NULL;
|
||||
e = expr_alloc_symbol(&symbol_yes);
|
||||
break;
|
||||
}
|
||||
if (e->right.sym == &symbol_yes) {
|
||||
// A!=y -> !A
|
||||
e->type = E_NOT;
|
||||
e->left.expr = expr_alloc_symbol(e->left.sym);
|
||||
e->right.sym = NULL;
|
||||
e = expr_alloc_one(E_NOT, e->left.expr);
|
||||
break;
|
||||
}
|
||||
break;
|
||||
@ -741,82 +653,51 @@ struct expr *expr_transform(struct expr *e)
|
||||
switch (e->left.expr->type) {
|
||||
case E_NOT:
|
||||
// !!A -> A
|
||||
tmp = e->left.expr->left.expr;
|
||||
free(e->left.expr);
|
||||
free(e);
|
||||
e = tmp;
|
||||
e = expr_transform(e);
|
||||
e = e->left.expr->left.expr;
|
||||
break;
|
||||
case E_EQUAL:
|
||||
case E_UNEQUAL:
|
||||
// !(A=B) -> A!=B
|
||||
tmp = e->left.expr;
|
||||
free(e);
|
||||
e = tmp;
|
||||
e->type = e->type == E_EQUAL ? E_UNEQUAL : E_EQUAL;
|
||||
e = expr_alloc_comp(e->left.expr->type == E_EQUAL ? E_UNEQUAL : E_EQUAL,
|
||||
e->left.expr->left.sym,
|
||||
e->left.expr->right.sym);
|
||||
break;
|
||||
case E_LEQ:
|
||||
case E_GEQ:
|
||||
// !(A<=B) -> A>B
|
||||
tmp = e->left.expr;
|
||||
free(e);
|
||||
e = tmp;
|
||||
e->type = e->type == E_LEQ ? E_GTH : E_LTH;
|
||||
e = expr_alloc_comp(e->left.expr->type == E_LEQ ? E_GTH : E_LTH,
|
||||
e->left.expr->left.sym,
|
||||
e->left.expr->right.sym);
|
||||
break;
|
||||
case E_LTH:
|
||||
case E_GTH:
|
||||
// !(A<B) -> A>=B
|
||||
tmp = e->left.expr;
|
||||
free(e);
|
||||
e = tmp;
|
||||
e->type = e->type == E_LTH ? E_GEQ : E_LEQ;
|
||||
e = expr_alloc_comp(e->left.expr->type == E_LTH ? E_GEQ : E_LEQ,
|
||||
e->left.expr->left.sym,
|
||||
e->left.expr->right.sym);
|
||||
break;
|
||||
case E_OR:
|
||||
// !(A || B) -> !A && !B
|
||||
tmp = e->left.expr;
|
||||
e->type = E_AND;
|
||||
e->right.expr = expr_alloc_one(E_NOT, tmp->right.expr);
|
||||
tmp->type = E_NOT;
|
||||
tmp->right.expr = NULL;
|
||||
e = expr_alloc_and(expr_alloc_one(E_NOT, e->left.expr->left.expr),
|
||||
expr_alloc_one(E_NOT, e->left.expr->right.expr));
|
||||
e = expr_transform(e);
|
||||
break;
|
||||
case E_AND:
|
||||
// !(A && B) -> !A || !B
|
||||
tmp = e->left.expr;
|
||||
e->type = E_OR;
|
||||
e->right.expr = expr_alloc_one(E_NOT, tmp->right.expr);
|
||||
tmp->type = E_NOT;
|
||||
tmp->right.expr = NULL;
|
||||
e = expr_alloc_or(expr_alloc_one(E_NOT, e->left.expr->left.expr),
|
||||
expr_alloc_one(E_NOT, e->left.expr->right.expr));
|
||||
e = expr_transform(e);
|
||||
break;
|
||||
case E_SYMBOL:
|
||||
if (e->left.expr->left.sym == &symbol_yes) {
|
||||
if (e->left.expr->left.sym == &symbol_yes)
|
||||
// !'y' -> 'n'
|
||||
tmp = e->left.expr;
|
||||
free(e);
|
||||
e = tmp;
|
||||
e->type = E_SYMBOL;
|
||||
e->left.sym = &symbol_no;
|
||||
break;
|
||||
}
|
||||
if (e->left.expr->left.sym == &symbol_mod) {
|
||||
e = expr_alloc_symbol(&symbol_no);
|
||||
else if (e->left.expr->left.sym == &symbol_mod)
|
||||
// !'m' -> 'm'
|
||||
tmp = e->left.expr;
|
||||
free(e);
|
||||
e = tmp;
|
||||
e->type = E_SYMBOL;
|
||||
e->left.sym = &symbol_mod;
|
||||
break;
|
||||
}
|
||||
if (e->left.expr->left.sym == &symbol_no) {
|
||||
e = expr_alloc_symbol(&symbol_mod);
|
||||
else if (e->left.expr->left.sym == &symbol_no)
|
||||
// !'n' -> 'y'
|
||||
tmp = e->left.expr;
|
||||
free(e);
|
||||
e = tmp;
|
||||
e->type = E_SYMBOL;
|
||||
e->left.sym = &symbol_yes;
|
||||
break;
|
||||
}
|
||||
e = expr_alloc_symbol(&symbol_yes);
|
||||
break;
|
||||
default:
|
||||
;
|
||||
@ -940,18 +821,18 @@ struct expr *expr_trans_compare(struct expr *e, enum expr_type type, struct symb
|
||||
case E_EQUAL:
|
||||
if (type == E_EQUAL) {
|
||||
if (sym == &symbol_yes)
|
||||
return expr_copy(e);
|
||||
return e;
|
||||
if (sym == &symbol_mod)
|
||||
return expr_alloc_symbol(&symbol_no);
|
||||
if (sym == &symbol_no)
|
||||
return expr_alloc_one(E_NOT, expr_copy(e));
|
||||
return expr_alloc_one(E_NOT, e);
|
||||
} else {
|
||||
if (sym == &symbol_yes)
|
||||
return expr_alloc_one(E_NOT, expr_copy(e));
|
||||
return expr_alloc_one(E_NOT, e);
|
||||
if (sym == &symbol_mod)
|
||||
return expr_alloc_symbol(&symbol_yes);
|
||||
if (sym == &symbol_no)
|
||||
return expr_copy(e);
|
||||
return e;
|
||||
}
|
||||
break;
|
||||
case E_SYMBOL:
|
||||
|
||||
@ -29,11 +29,21 @@ enum expr_type {
|
||||
};
|
||||
|
||||
union expr_data {
|
||||
struct expr *expr;
|
||||
struct symbol *sym;
|
||||
struct expr * const expr;
|
||||
struct symbol * const sym;
|
||||
void *_initdata;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct expr - expression
|
||||
*
|
||||
* @node: link node for the hash table
|
||||
* @type: expressoin type
|
||||
* @left: left node
|
||||
* @right: right node
|
||||
*/
|
||||
struct expr {
|
||||
struct hlist_node node;
|
||||
enum expr_type type;
|
||||
union expr_data left, right;
|
||||
};
|
||||
@ -275,8 +285,6 @@ struct expr *expr_alloc_two(enum expr_type type, struct expr *e1, struct expr *e
|
||||
struct expr *expr_alloc_comp(enum expr_type type, struct symbol *s1, struct symbol *s2);
|
||||
struct expr *expr_alloc_and(struct expr *e1, struct expr *e2);
|
||||
struct expr *expr_alloc_or(struct expr *e1, struct expr *e2);
|
||||
struct expr *expr_copy(const struct expr *org);
|
||||
void expr_free(struct expr *e);
|
||||
void expr_eliminate_eq(struct expr **ep1, struct expr **ep2);
|
||||
bool expr_eq(struct expr *e1, struct expr *e2);
|
||||
tristate expr_calc_value(struct expr *e);
|
||||
|
||||
@ -11,6 +11,10 @@ extern HASHTABLE_DECLARE(sym_hashtable, SYMBOL_HASHSIZE);
|
||||
#define for_all_symbols(sym) \
|
||||
hash_for_each(sym_hashtable, sym, node)
|
||||
|
||||
#define EXPR_HASHSIZE (1U << 14)
|
||||
|
||||
extern HASHTABLE_DECLARE(expr_hashtable, EXPR_HASHSIZE);
|
||||
|
||||
struct menu;
|
||||
|
||||
extern struct menu *current_menu, *current_entry;
|
||||
|
||||
@ -107,12 +107,13 @@ static struct expr *rewrite_m(struct expr *e)
|
||||
|
||||
switch (e->type) {
|
||||
case E_NOT:
|
||||
e->left.expr = rewrite_m(e->left.expr);
|
||||
e = expr_alloc_one(E_NOT, rewrite_m(e->left.expr));
|
||||
break;
|
||||
case E_OR:
|
||||
case E_AND:
|
||||
e->left.expr = rewrite_m(e->left.expr);
|
||||
e->right.expr = rewrite_m(e->right.expr);
|
||||
e = expr_alloc_two(e->type,
|
||||
rewrite_m(e->left.expr),
|
||||
rewrite_m(e->right.expr));
|
||||
break;
|
||||
case E_SYMBOL:
|
||||
/* change 'm' into 'm' && MODULES */
|
||||
@ -192,21 +193,11 @@ struct property *menu_add_prompt(enum prop_type type, const char *prompt,
|
||||
struct menu *menu = current_entry;
|
||||
|
||||
while ((menu = menu->parent) != NULL) {
|
||||
struct expr *dup_expr;
|
||||
|
||||
if (!menu->visibility)
|
||||
continue;
|
||||
/*
|
||||
* Do not add a reference to the menu's visibility
|
||||
* expression but use a copy of it. Otherwise the
|
||||
* expression reduction functions will modify
|
||||
* expressions that have multiple references which
|
||||
* can cause unwanted side effects.
|
||||
*/
|
||||
dup_expr = expr_copy(menu->visibility);
|
||||
|
||||
prop->visible.expr = expr_alloc_and(prop->visible.expr,
|
||||
dup_expr);
|
||||
menu->visibility);
|
||||
}
|
||||
}
|
||||
|
||||
@ -322,7 +313,7 @@ static void _menu_finalize(struct menu *parent, bool inside_choice)
|
||||
*/
|
||||
basedep = rewrite_m(menu->dep);
|
||||
basedep = expr_transform(basedep);
|
||||
basedep = expr_alloc_and(expr_copy(parent->dep), basedep);
|
||||
basedep = expr_alloc_and(parent->dep, basedep);
|
||||
basedep = expr_eliminate_dups(basedep);
|
||||
menu->dep = basedep;
|
||||
|
||||
@ -366,7 +357,7 @@ static void _menu_finalize(struct menu *parent, bool inside_choice)
|
||||
*/
|
||||
dep = rewrite_m(prop->visible.expr);
|
||||
dep = expr_transform(dep);
|
||||
dep = expr_alloc_and(expr_copy(basedep), dep);
|
||||
dep = expr_alloc_and(basedep, dep);
|
||||
dep = expr_eliminate_dups(dep);
|
||||
prop->visible.expr = dep;
|
||||
|
||||
@ -377,11 +368,11 @@ static void _menu_finalize(struct menu *parent, bool inside_choice)
|
||||
if (prop->type == P_SELECT) {
|
||||
struct symbol *es = prop_get_symbol(prop);
|
||||
es->rev_dep.expr = expr_alloc_or(es->rev_dep.expr,
|
||||
expr_alloc_and(expr_alloc_symbol(menu->sym), expr_copy(dep)));
|
||||
expr_alloc_and(expr_alloc_symbol(menu->sym), dep));
|
||||
} else if (prop->type == P_IMPLY) {
|
||||
struct symbol *es = prop_get_symbol(prop);
|
||||
es->implied.expr = expr_alloc_or(es->implied.expr,
|
||||
expr_alloc_and(expr_alloc_symbol(menu->sym), expr_copy(dep)));
|
||||
expr_alloc_and(expr_alloc_symbol(menu->sym), dep));
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -441,22 +432,18 @@ static void _menu_finalize(struct menu *parent, bool inside_choice)
|
||||
*/
|
||||
dep = expr_trans_compare(dep, E_UNEQUAL, &symbol_no);
|
||||
dep = expr_eliminate_dups(expr_transform(dep));
|
||||
dep2 = expr_copy(basedep);
|
||||
dep2 = basedep;
|
||||
expr_eliminate_eq(&dep, &dep2);
|
||||
expr_free(dep);
|
||||
if (!expr_is_yes(dep2)) {
|
||||
/* Not superset, quit */
|
||||
expr_free(dep2);
|
||||
break;
|
||||
}
|
||||
/* Superset, put in submenu */
|
||||
expr_free(dep2);
|
||||
next:
|
||||
_menu_finalize(menu, false);
|
||||
menu->parent = parent;
|
||||
last_menu = menu;
|
||||
}
|
||||
expr_free(basedep);
|
||||
if (last_menu) {
|
||||
parent->list = parent->next;
|
||||
parent->next = last_menu->next;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user