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List: linux-sparse
Subject: [PATCH] Fix size calculation of unsized bool array
From: Luc Van Oostenryck <luc.vanoostenryck () gmail ! com>
Date: 2016-01-07 1:47:09
Message-ID: 1452131229-29756-1-git-send-email-luc.vanoostenryck () gmail ! com
[Download RAW message or body]
This stops sparse from issuing the error message
"error: cannot size expression"
for code like:
static _Bool boolarray[] = {
0,
1,
};
static int n = sizeof(boolarray);
The fix consists of using array_element_offset() for calculating
the size of unsized arrays, like it is done elsewhere for sized ones.
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
---
symbol.c | 2 +-
validation/bool-array.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 48 insertions(+), 1 deletion(-)
create mode 100644 validation/bool-array.c
diff --git a/symbol.c b/symbol.c
index 0ceff628..92a7a625 100644
--- a/symbol.c
+++ b/symbol.c
@@ -393,7 +393,7 @@ static struct symbol * examine_node_type(struct symbol *sym)
int count = count_array_initializer(node_type, initializer);
if (node_type && node_type->bit_size >= 0)
- bit_size = node_type->bit_size * count;
+ bit_size = array_element_offset(node_type->bit_size, count);
}
}
diff --git a/validation/bool-array.c b/validation/bool-array.c
new file mode 100644
index 00000000..6c4c8723
--- /dev/null
+++ b/validation/bool-array.c
@@ -0,0 +1,47 @@
+static _Bool boolarray_d1[1];
+static _Bool boolarray_d8[8];
+static _Bool boolarray_i2[2] = {
+ 0,
+ 1,
+};
+static int nd1 = sizeof(boolarray_d1);
+static int nd8 = sizeof(boolarray_d8);
+static int ni2 = sizeof(boolarray_i2);
+
+
+static long longarray_u2[] = {
+ 0,
+ 1,
+};
+static int nl2 = sizeof(longarray_u2);
+
+/*
+ * Used to get "warning: excessive elements in array initializer"
+ * for all elements but the first one.
+ * Note: only occurs if nbr of elements is a multiple of 8
+ * (if not, theer was another problem)
+ */
+static _Bool boolarray_u8[] = {
+ 0,
+ 1,
+ 0,
+ 1,
+ 0,
+ 1,
+ 0,
+ 1,
+};
+
+/*
+ * Used to get "error: cannot size expression" for the sizeof.
+ */
+static _Bool boolarray_u2[] = {
+ 0,
+ 1,
+};
+static int nu2 = sizeof(boolarray_u2);
+
+/*
+ * check-name: sizeof(bool array)
+ * check-command: sparse -Wno-sizeof-bool $file
+ */
--
2.7.0
--
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