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queue(3): Enhance queue debugging macros 

Split the QUEUE_MACRO_DEBUG into QUEUE_MACRO_DEBUG_TRACE and
QUEUE_MACRO_DEBUG_TRASH.

Add the debug macrso QMD_IS_TRASHED() and QMD_SLIST_CHECK_PREVPTR().

Document these in queue.3.

Reviewed by:	emaste
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D3984
This commit is contained in:
cem 2017-04-04 12:00:29 +02:00 committed by Corinna Vinschen
parent 9998bd4b7c
commit 5e36b70104
1 changed files with 37 additions and 5 deletions
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42
newlib/libc/include/sys/queue.h
View File

@ -113,6 +113,12 @@
*
*/
#ifdef QUEUE_MACRO_DEBUG
#warn Use QUEUE_MACRO_DEBUG_TRACE and/or QUEUE_MACRO_DEBUG_TRASH
#define QUEUE_MACRO_DEBUG_TRACE
#define QUEUE_MACRO_DEBUG_TRASH
#endif
#ifdef QUEUE_MACRO_DEBUG_TRACE
/* Store the last 2 places the queue element or head was altered */
struct qm_trace {
unsigned long lastline;
@ -123,8 +129,6 @@ struct qm_trace {
#define TRACEBUF struct qm_trace trace;
#define TRACEBUF_INITIALIZER { __LINE__, 0, __FILE__, NULL } ,
#define TRASHIT(x) do {(x) = (void *)-1;} while (0)
#define QMD_SAVELINK(name, link) void **name = (void *)&(link)
#define QMD_TRACE_HEAD(head) do { \
(head)->trace.prevline = (head)->trace.lastline; \
@ -140,14 +144,26 @@ struct qm_trace {
(elem)->trace.lastfile = __FILE__; \
} while (0)
#else
#else /* !QUEUE_MACRO_DEBUG_TRACE */
#define QMD_TRACE_ELEM(elem)
#define QMD_TRACE_HEAD(head)
#define QMD_SAVELINK(name, link)
#define TRACEBUF
#define TRACEBUF_INITIALIZER
#endif /* QUEUE_MACRO_DEBUG_TRACE */
#ifdef QUEUE_MACRO_DEBUG_TRASH
#define TRASHIT(x) do {(x) = (void *)-1;} while (0)
#define QMD_IS_TRASHED(x) ((x) == (void *)(intptr_t)-1)
#else /* !QUEUE_MACRO_DEBUG_TRASH */
#define TRASHIT(x)
#endif /* QUEUE_MACRO_DEBUG */
#define QMD_IS_TRASHED(x) 0
#endif /* QUEUE_MACRO_DEBUG_TRASH */
#if defined(QUEUE_MACRO_DEBUG_TRACE) || defined(QUEUE_MACRO_DEBUG_TRASH)
#define QMD_SAVELINK(name, link) void **name = (void *)&(link)
#else /* !QUEUE_MACRO_DEBUG_TRACE && !QUEUE_MACRO_DEBUG_TRASH */
#define QMD_SAVELINK(name, link)
#endif /* QUEUE_MACRO_DEBUG_TRACE || QUEUE_MACRO_DEBUG_TRASH */
#ifdef __cplusplus
/*
@ -187,6 +203,16 @@ struct { \
/*
* Singly-linked List functions.
*/
#if (defined(_KERNEL) && defined(INVARIANTS))
#define QMD_SLIST_CHECK_PREVPTR(prevp, elm) do { \
if (*(prevp) != (elm)) \
panic("Bad prevptr *(%p) == %p != %p", \
(prevp), *(prevp), (elm)); \
} while (0)
#else
#define QMD_SLIST_CHECK_PREVPTR(prevp, elm)
#endif
#define SLIST_CONCAT(head1, head2, type, field) do { \
QUEUE_TYPEOF(type) *curelm = SLIST_FIRST(head1); \
if (curelm == NULL) { \
@ -268,6 +294,12 @@ struct { \
SLIST_FIRST((head)) = SLIST_NEXT(SLIST_FIRST((head)), field); \
} while (0)
#define SLIST_REMOVE_PREVPTR(prevp, elm, field) do { \
QMD_SLIST_CHECK_PREVPTR(prevp, elm); \
*(prevp) = SLIST_NEXT(elm, field); \
TRASHIT((elm)->field.sle_next); \
} while (0)
#define SLIST_SWAP(head1, head2, type) do { \
QUEUE_TYPEOF(type) *swap_first = SLIST_FIRST(head1); \
SLIST_FIRST(head1) = SLIST_FIRST(head2); \