From: Harshvardhan Jha <harshvardhan.jha@oracle.com>
To: smatch@vger.kernel.org
Cc: dan.carpenter@oracle.com, Harshvardhan Jha <harshvardhan.jha@oracle.com>
Subject: [PATCH] extra: Fixed handle_bit_test so that null set condition is taken care of
Date: Sun, 11 Jul 2021 02:39:49 +0530 [thread overview]
Message-ID: <20210710210949.20264-1-harshvardhan.jha@oracle.com> (raw)
The handle_bit_test condition wasn't setting a false range_list for the
false state and hence the implied rl was coming out to be false. The
false and true rls have been calculating using rl_intersection and
rl_filter commands.
Signed-off-by: Harshvardhan Jha <harshvardhan.jha@oracle.com>
---
| 17 +++++++++--------
validation/sm_bits2.c | 28 ++++++++++++++++++++++++++++
2 files changed, 37 insertions(+), 8 deletions(-)
create mode 100644 validation/sm_bits2.c
--git a/smatch_extra.c b/smatch_extra.c
index e864646a..27bf5a02 100644
--- a/smatch_extra.c
+++ b/smatch_extra.c
@@ -2061,7 +2061,7 @@ static void match_comparison(struct expression *expr)
static bool handle_bit_test(struct expression *expr)
{
- struct range_list *orig_rl, *rl;
+ struct range_list *orig_rl, *rl, *true_rl, *false_rl;
struct expression *shift, *mask, *var;
struct bit_info *bit_info;
sval_t sval;
@@ -2083,23 +2083,24 @@ static bool handle_bit_test(struct expression *expr)
bit_info = get_bit_info(mask);
if (!bit_info)
return false;
- if (!bit_info->possible)
+ if (!bit_info->possible){
+ set_true_false_states_expr(my_id, var, alloc_estate_empty(), NULL);
return false;
+ }
get_absolute_rl(var, &orig_rl);
if (sval_is_negative(rl_min(orig_rl)) ||
rl_max(orig_rl).uvalue > type_bits(get_type(shift->left)))
return false;
- low.value = ffsll(bit_info->possible);
- high.value = sm_fls64(bit_info->possible);
+ low.value = ffsll(bit_info->possible) - 1;
+ high.value = sm_fls64(bit_info->possible) - 1;
rl = alloc_rl(low, high);
rl = cast_rl(get_type(var), rl);
- rl = rl_intersection(orig_rl, rl);
- if (!rl)
- return false;
+ true_rl = rl_intersection(orig_rl, rl);
+ false_rl = rl_filter(orig_rl, rl);
- set_extra_expr_true_false(shift->right, alloc_estate_rl(rl), NULL);
+ set_extra_expr_true_false(shift->right, alloc_estate_rl(true_rl), alloc_estate_rl(false_rl));
return true;
}
diff --git a/validation/sm_bits2.c b/validation/sm_bits2.c
new file mode 100644
index 00000000..1a43538a
--- /dev/null
+++ b/validation/sm_bits2.c
@@ -0,0 +1,28 @@
+#include "../check_debug.h"
+
+unsigned int frob();
+
+void test(void)
+{
+ unsigned int mask = 0xff0;
+ unsigned int x = frob();
+
+ if (x < 4 || x > 11)
+ return;
+
+ if ((1 << x) & mask) {
+ __smatch_implied(x);
+ return;
+ }
+ __smatch_implied(x);
+}
+
+/*
+ * check-name: smatch bits 2
+ * check-command: smatch sm_bits2.c
+ *
+ * check-output-start
+sm_bits2.c:14 test() implied: x = '4-11'
+sm_bits2.c:17 test() implied: x = ''
+ * check-output-end
+ */
--
2.32.0
next reply other threads:[~2021-07-10 21:12 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-10 21:09 Harshvardhan Jha [this message]
2021-07-12 6:21 ` [PATCH] extra: Fixed handle_bit_test so that null set condition is taken care of Dan Carpenter
2021-07-12 6:36 ` Dan Carpenter
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