Add assert() for debug assertions

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@chromium.org>

diff --git a/common/dlmalloc.c b/common/dlmalloc.c
index e9bab09..f2080c6 100644 (file)
--- 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 af8b154..d244bd4 100644 (file)
--- 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 (file)
--- 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 (file)
--- 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 c029fbb..79dead3 100644 (file)
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -730,3 +730,11 @@ void panic(const char *fmt, ...)
        while (1)
                ;
 }
+
+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);
+}