[U-Boot] [PATCH v3] Add assert() for debug assertions
Simon Glass
sjg at chromium.org
Wed Jun 29 21:49:34 CEST 2011
assert() is like BUG_ON() but compiles to nothing unless DEBUG is defined.
This is useful when a condition is an error but a board reset is unlikely
to fix it, so it is better to soldier on in hope. Assertion failures should
be caught during development/test.
It turns out that assert() is defined separately in a few places in U-Boot
with various meanings. This patch cleans up some of these.
Build errors exposed by this change (and defining DEBUG) are also fixed in
this patch.
Signed-off-by: Simon Glass <sjg at chromium.org>
---
Changes in v2:
- Changed macros so that all code is compiled even if DEBUG is disabled
Changes in v3:
- Use panic() instead of printf()
- Use separate __assert_fail() function to reduce memory footprint
- Changed output format to match assert(3)
common/dlmalloc.c | 7 -------
include/common.h | 21 +++++++++++++++++++++
include/malloc.h | 8 --------
lib/qsort.c | 5 -----
lib/vsprintf.c | 8 ++++++++
5 files changed, 29 insertions(+), 20 deletions(-)
diff --git a/common/dlmalloc.c b/common/dlmalloc.c
index e9bab09..f2080c6 100644
--- a/common/dlmalloc.c
+++ b/common/dlmalloc.c
@@ -286,13 +286,6 @@ extern "C" {
*/
-#ifdef DEBUG
-#include <assert.h>
-#else
-#define assert(x) ((void)0)
-#endif
-
-
/*
INTERNAL_SIZE_T is the word-size used for internal bookkeeping
of chunk sizes. On a 64-bit machine, you can reduce malloc
diff --git a/include/common.h b/include/common.h
index 1e21b7a..0956b93 100644
--- a/include/common.h
+++ b/include/common.h
@@ -124,6 +124,27 @@ typedef volatile unsigned char vu_char;
#define debugX(level,fmt,args...)
#endif /* DEBUG */
+#ifdef DEBUG
+# define _DEBUG 1
+#else
+# define _DEBUG 0
+#endif
+
+/*
+ * An assertion is run-time check done in debug mode only. If DEBUG is not
+ * defined then it is skipped. If DEBUG is defined and the assertion fails,
+ * then it calls panic*( which may or may not reset/halt U-Boot (see
+ * CONFIG_PANIC_HANG), It is hoped that all failing assertions are found
+ * before release, and after release it is hoped that they don't matter. But
+ * in any case these failing assertions cannot be fixed with a reset (which
+ * may just do the same assertion again).
+ */
+void __assert_fail(const char *assertion, const char *file, unsigned line,
+ const char *function);
+#define assert(x) \
+ ({ if (!(x) && _DEBUG) \
+ __assert_fail(#x, __FILE__, __LINE__, __func__); })
+
#define error(fmt, args...) do { \
printf("ERROR: " fmt "\nat %s:%d/%s()\n", \
##args, __FILE__, __LINE__, __func__); \
diff --git a/include/malloc.h b/include/malloc.h
index 3e145ad..ecf3c67 100644
--- a/include/malloc.h
+++ b/include/malloc.h
@@ -285,14 +285,6 @@ extern "C" {
*/
-#ifdef DEBUG
-/* #include <assert.h> */
-#define assert(x) ((void)0)
-#else
-#define assert(x) ((void)0)
-#endif
-
-
/*
INTERNAL_SIZE_T is the word-size used for internal bookkeeping
of chunk sizes. On a 64-bit machine, you can reduce malloc
diff --git a/lib/qsort.c b/lib/qsort.c
index 1cc0d31..86c392c 100644
--- a/lib/qsort.c
+++ b/lib/qsort.c
@@ -17,11 +17,6 @@
#include <linux/types.h>
#include <exports.h>
-#if 0
-#include <assert.h>
-#else
-#define assert(arg)
-#endif
void qsort(void *base,
size_t nel,
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 3b924ec..1f01b70 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -728,3 +728,11 @@ void panic(const char *fmt, ...)
do_reset (NULL, 0, 0, NULL);
#endif
}
+
+void __assert_fail(const char *assertion, const char *file, unsigned line,
+ const char *function)
+{
+ /* This will not return */
+ panic("%s:%u: %s: Assertion `%s' failed.", file, line, function,
+ assertion);
+}
--
1.7.3.1
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