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Message-ID: <4074365.1YlsYGzSFT@tacticalops>
Date: Thu, 13 Feb 2014 13:57:13 +0100
From: Martin Walch <walch.martin@....de>
To: linux-kbuild@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
"Yann E. MORIN" <yann.morin.1998@...e.fr>
Subject: [PATCH 1/2] kconfig: completely remove expr_eliminate_dups2() and related code
From: Martin Walch <walch.martin@....de>
Date: Thu, 13 Feb 2014 02:13:01 +0100
Subject: [PATCH 1/2] kconfig: completely remove expr_eliminate_dups2() and related code
this removes expr_eliminate_dups2(), expr_extract_eq_and(), expr_extract_eq_or(), and expr_extract_eq() from scripts/kconfig/expr.[ch]
As the comments in the code state, expr_eliminate_dups2 applies these two transformations:
(FOO || BAR) && (!FOO && !BAR) -> n
(FOO && BAR) || (!FOO || !BAR) -> y
At first glance, this may look like a good idea. On second thought, one should verify all possible values for FOO and BAR, finally leading to the assignment
FOO << 1
BAR << 1
which yields for both expressions the interpretation 1 (syntactically this corresponds to an m) when applying the evaluation rules from
Documentation/kbuild/kconfig-language.txt:
(FOO || BAR) && (!FOO && !BAR)
-> min(max(1, 1), min(2-1, 2-1)) = min(1, 1) = 1
(FOO && BAR) || (!FOO || !BAR)
-> max(min(1, 1), max(2-1, 2-1)) = max(1, 1) = 1
As n always evaluates to 0 and y to 2, this means that the transformation does not preserve semantics, which I guess is not intended here.
In particular, the expression m && !m expands to (m && MODULES) && !(m && MODULES), then to (m && MODULES) && (!m || !MODULES), and finally in
expr_eliminate_dups2 to n. I therefore think it is a bug which should be fixed.
This patch should fix the problem by just removing the corresponding code. Nothing should break: a quick check did not yield any expression in the
mainline kernel that the (bad) transformation currently applies to. Also, as far as I understand the code, expr_eliminate_dups2 does not do anything
except those two transformations that are to be removed.
As a positive side effect, this reduces code size in expr.c by roughly 10% and slightly improves startup time for all configuration frontends.
Signed-off-by: Martin Walch <walch.martin@....de>
---
scripts/kconfig/expr.c | 108 -------------------------------------------------
scripts/kconfig/expr.h | 3 --
2 files changed, 111 deletions(-)
diff --git a/scripts/kconfig/expr.c b/scripts/kconfig/expr.c
index d662652..4aa171b 100644
--- a/scripts/kconfig/expr.c
+++ b/scripts/kconfig/expr.c
@@ -553,62 +553,6 @@ static void expr_eliminate_dups1(enum expr_type type, struct expr **ep1, struct
#undef e2
}
-static void expr_eliminate_dups2(enum expr_type type, struct expr **ep1, struct expr **ep2)
-{
-#define e1 (*ep1)
-#define e2 (*ep2)
- struct expr *tmp, *tmp1, *tmp2;
-
- if (e1->type == type) {
- expr_eliminate_dups2(type, &e1->left.expr, &e2);
- expr_eliminate_dups2(type, &e1->right.expr, &e2);
- return;
- }
- if (e2->type == type) {
- expr_eliminate_dups2(type, &e1, &e2->left.expr);
- expr_eliminate_dups2(type, &e1, &e2->right.expr);
- }
- if (e1 == e2)
- return;
-
- switch (e1->type) {
- case E_OR:
- expr_eliminate_dups2(e1->type, &e1, &e1);
- // (FOO || BAR) && (!FOO && !BAR) -> n
- tmp1 = expr_transform(expr_alloc_one(E_NOT, expr_copy(e1)));
- tmp2 = expr_copy(e2);
- tmp = expr_extract_eq_and(&tmp1, &tmp2);
- if (expr_is_yes(tmp1)) {
- expr_free(e1);
- e1 = expr_alloc_symbol(&symbol_no);
- trans_count++;
- }
- expr_free(tmp2);
- expr_free(tmp1);
- expr_free(tmp);
- break;
- case E_AND:
- expr_eliminate_dups2(e1->type, &e1, &e1);
- // (FOO && BAR) || (!FOO || !BAR) -> y
- tmp1 = expr_transform(expr_alloc_one(E_NOT, expr_copy(e1)));
- tmp2 = expr_copy(e2);
- tmp = expr_extract_eq_or(&tmp1, &tmp2);
- if (expr_is_no(tmp1)) {
- expr_free(e1);
- e1 = expr_alloc_symbol(&symbol_yes);
- trans_count++;
- }
- expr_free(tmp2);
- expr_free(tmp1);
- expr_free(tmp);
- break;
- default:
- ;
- }
-#undef e1
-#undef e2
-}
-
struct expr *expr_eliminate_dups(struct expr *e)
{
int oldcount;
@@ -621,7 +565,6 @@ struct expr *expr_eliminate_dups(struct expr *e)
switch (e->type) {
case E_OR: case E_AND:
expr_eliminate_dups1(e->type, &e, &e);
- expr_eliminate_dups2(e->type, &e, &e);
default:
;
}
@@ -823,57 +766,6 @@ bool expr_depends_symbol(struct expr *dep, struct symbol *sym)
return false;
}
-struct expr *expr_extract_eq_and(struct expr **ep1, struct expr **ep2)
-{
- struct expr *tmp = NULL;
- expr_extract_eq(E_AND, &tmp, ep1, ep2);
- if (tmp) {
- *ep1 = expr_eliminate_yn(*ep1);
- *ep2 = expr_eliminate_yn(*ep2);
- }
- return tmp;
-}
-
-struct expr *expr_extract_eq_or(struct expr **ep1, struct expr **ep2)
-{
- struct expr *tmp = NULL;
- expr_extract_eq(E_OR, &tmp, ep1, ep2);
- if (tmp) {
- *ep1 = expr_eliminate_yn(*ep1);
- *ep2 = expr_eliminate_yn(*ep2);
- }
- return tmp;
-}
-
-void expr_extract_eq(enum expr_type type, struct expr **ep, struct expr **ep1, struct expr **ep2)
-{
-#define e1 (*ep1)
-#define e2 (*ep2)
- if (e1->type == type) {
- expr_extract_eq(type, ep, &e1->left.expr, &e2);
- expr_extract_eq(type, ep, &e1->right.expr, &e2);
- return;
- }
- if (e2->type == type) {
- expr_extract_eq(type, ep, ep1, &e2->left.expr);
- expr_extract_eq(type, ep, ep1, &e2->right.expr);
- return;
- }
- if (expr_eq(e1, e2)) {
- *ep = *ep ? expr_alloc_two(type, *ep, e1) : e1;
- expr_free(e2);
- if (type == E_AND) {
- e1 = expr_alloc_symbol(&symbol_yes);
- e2 = expr_alloc_symbol(&symbol_yes);
- } else if (type == E_OR) {
- e1 = expr_alloc_symbol(&symbol_no);
- e2 = expr_alloc_symbol(&symbol_no);
- }
- }
-#undef e1
-#undef e2
-}
-
struct expr *expr_trans_compare(struct expr *e, enum expr_type type, struct symbol *sym)
{
struct expr *e1, *e2;
diff --git a/scripts/kconfig/expr.h b/scripts/kconfig/expr.h
index ba663e1..fb9e470 100644
--- a/scripts/kconfig/expr.h
+++ b/scripts/kconfig/expr.h
@@ -211,9 +211,6 @@ struct expr *expr_eliminate_dups(struct expr *e);
struct expr *expr_transform(struct expr *e);
int expr_contains_symbol(struct expr *dep, struct symbol *sym);
bool expr_depends_symbol(struct expr *dep, struct symbol *sym);
-struct expr *expr_extract_eq_and(struct expr **ep1, struct expr **ep2);
-struct expr *expr_extract_eq_or(struct expr **ep1, struct expr **ep2);
-void expr_extract_eq(enum expr_type type, struct expr **ep, struct expr **ep1, struct expr **ep2);
struct expr *expr_trans_compare(struct expr *e, enum expr_type type, struct symbol *sym);
struct expr *expr_simplify_unmet_dep(struct expr *e1, struct expr *e2);
--
1.8.3.2
--
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