Use TAILQ macros instead of CIRCLEQ in libdb2

The optimizer in gcc 4.8.1 (but not the current gcc head revision)
breaks the queue.h CIRCLEQ macros, apparently due to an overzealous
strict aliasing deduction.  Use TAILQ macros in the libdb2 mpool code
instead.

(cherry picked from commit 26d874412983c4c9979a9f5e7bec51834ad4cda5)

ticket: 8116 (new)
version_fixed: 1.11.6
status: resolved

2 files changed, 24 insertions, 27 deletions

diff --git a/src/plugins/kdb/db2/libdb2/mpool/mpool.c b/src/plugins/kdb/db2/libdb2/mpool/mpool.c
index acdc1b8..7941a9f 100644
--- a/src/plugins/kdb/db2/libdb2/mpool/mpool.c
+++ b/src/plugins/kdb/db2/libdb2/mpool/mpool.c
@@ -81,9 +81,9 @@ mpool_open(key, fd, pagesize, maxcache)
 	/* Allocate and initialize the MPOOL cookie. */
 	if ((mp = (MPOOL *)calloc(1, sizeof(MPOOL))) == NULL)
 		return (NULL);
-	CIRCLEQ_INIT(&mp->lqh);
+	TAILQ_INIT(&mp->lqh);
 	for (entry = 0; entry < HASHSIZE; ++entry)
-		CIRCLEQ_INIT(&mp->hqh[entry]);
+		TAILQ_INIT(&mp->hqh[entry]);
 	mp->maxcache = maxcache;
 	mp->npages = sb.st_size / pagesize;
 	mp->pagesize = pagesize;
@@ -143,8 +143,8 @@ mpool_new(mp, pgnoaddr, flags)
 	bp->flags = MPOOL_PINNED | MPOOL_INUSE;
 
 	head = &mp->hqh[HASHKEY(bp->pgno)];
-	CIRCLEQ_INSERT_HEAD(head, bp, hq);
-	CIRCLEQ_INSERT_TAIL(&mp->lqh, bp, q);
+	TAILQ_INSERT_HEAD(head, bp, hq);
+	TAILQ_INSERT_TAIL(&mp->lqh, bp, q);
 	return (bp->page);
 }
 
@@ -168,8 +168,8 @@ mpool_delete(mp, page)
 
 	/* Remove from the hash and lru queues. */
 	head = &mp->hqh[HASHKEY(bp->pgno)];
-	CIRCLEQ_REMOVE(head, bp, hq);
-	CIRCLEQ_REMOVE(&mp->lqh, bp, q);
+	TAILQ_REMOVE(head, bp, hq);
+	TAILQ_REMOVE(&mp->lqh, bp, q);
 
 	free(bp);
 	return (RET_SUCCESS);
@@ -208,10 +208,10 @@ mpool_get(mp, pgno, flags)
 		 * of the lru chain.
 		 */
 		head = &mp->hqh[HASHKEY(bp->pgno)];
-		CIRCLEQ_REMOVE(head, bp, hq);
-		CIRCLEQ_INSERT_HEAD(head, bp, hq);
-		CIRCLEQ_REMOVE(&mp->lqh, bp, q);
-		CIRCLEQ_INSERT_TAIL(&mp->lqh, bp, q);
+		TAILQ_REMOVE(head, bp, hq);
+		TAILQ_INSERT_HEAD(head, bp, hq);
+		TAILQ_REMOVE(&mp->lqh, bp, q);
+		TAILQ_INSERT_TAIL(&mp->lqh, bp, q);
 
 		/* Return a pinned page. */
 		bp->flags |= MPOOL_PINNED;
@@ -261,8 +261,8 @@ mpool_get(mp, pgno, flags)
 	 * of the lru chain.
 	 */
 	head = &mp->hqh[HASHKEY(bp->pgno)];
-	CIRCLEQ_INSERT_HEAD(head, bp, hq);
-	CIRCLEQ_INSERT_TAIL(&mp->lqh, bp, q);
+	TAILQ_INSERT_HEAD(head, bp, hq);
+	TAILQ_INSERT_TAIL(&mp->lqh, bp, q);
 
 	/* Run through the user's filter. */
 	if (mp->pgin != NULL)
@@ -311,8 +311,8 @@ mpool_close(mp)
 	BKT *bp;
 
 	/* Free up any space allocated to the lru pages. */
-	while ((bp = mp->lqh.cqh_first) != (void *)&mp->lqh) {
-		CIRCLEQ_REMOVE(&mp->lqh, mp->lqh.cqh_first, q);
+	while ((bp = mp->lqh.tqh_first) != NULL) {
+		TAILQ_REMOVE(&mp->lqh, mp->lqh.tqh_first, q);
 		free(bp);
 	}
 
@@ -332,8 +332,7 @@ mpool_sync(mp)
 	BKT *bp;
 
 	/* Walk the lru chain, flushing any dirty pages to disk. */
-	for (bp = mp->lqh.cqh_first;
-	    bp != (void *)&mp->lqh; bp = bp->q.cqe_next)
+	for (bp = mp->lqh.tqh_first; bp != NULL; bp = bp->q.tqe_next)
 		if (bp->flags & MPOOL_DIRTY &&
 		    mpool_write(mp, bp) == RET_ERROR)
 			return (RET_ERROR);
@@ -363,8 +362,7 @@ mpool_bkt(mp)
 	 * off any lists.  If we don't find anything we grow the cache anyway.
 	 * The cache never shrinks.
 	 */
-	for (bp = mp->lqh.cqh_first;
-	    bp != (void *)&mp->lqh; bp = bp->q.cqe_next)
+	for (bp = mp->lqh.tqh_first; bp != NULL; bp = bp->q.tqe_next)
 		if (!(bp->flags & MPOOL_PINNED)) {
 			/* Flush if dirty. */
 			if (bp->flags & MPOOL_DIRTY &&
@@ -375,8 +373,8 @@ mpool_bkt(mp)
 #endif
 			/* Remove from the hash and lru queues. */
 			head = &mp->hqh[HASHKEY(bp->pgno)];
-			CIRCLEQ_REMOVE(head, bp, hq);
-			CIRCLEQ_REMOVE(&mp->lqh, bp, q);
+			TAILQ_REMOVE(head, bp, hq);
+			TAILQ_REMOVE(&mp->lqh, bp, q);
 #if defined(DEBUG) && !defined(DEBUG_IDX0SPLIT)
 			{ void *spage;
 				spage = bp->page;
@@ -450,7 +448,7 @@ mpool_look(mp, pgno)
 	BKT *bp;
 
 	head = &mp->hqh[HASHKEY(pgno)];
-	for (bp = head->cqh_first; bp != (void *)head; bp = bp->hq.cqe_next)
+	for (bp = head->tqh_first; bp != NULL; bp = bp->hq.tqe_next)
 		if ((bp->pgno == pgno) && (bp->flags & MPOOL_INUSE)) {
 #ifdef STATISTICS
 			++mp->cachehit;
@@ -494,8 +492,7 @@ mpool_stat(mp)
 
 	sep = "";
 	cnt = 0;
-	for (bp = mp->lqh.cqh_first;
-	    bp != (void *)&mp->lqh; bp = bp->q.cqe_next) {
+	for (bp = mp->lqh.tqh_first; bp != NULL; bp = bp->q.tqe_next) {
 		(void)fprintf(stderr, "%s%d", sep, bp->pgno);
 		if (bp->flags & MPOOL_DIRTY)
 			(void)fprintf(stderr, "d");
diff --git a/src/plugins/kdb/db2/libdb2/mpool/mpool.h b/src/plugins/kdb/db2/libdb2/mpool/mpool.h
index 627ad5b..bed5ed3 100644
--- a/src/plugins/kdb/db2/libdb2/mpool/mpool.h
+++ b/src/plugins/kdb/db2/libdb2/mpool/mpool.h
@@ -47,8 +47,8 @@
 
 /* The BKT structures are the elements of the queues. */
 typedef struct _bkt {
-	CIRCLEQ_ENTRY(_bkt) hq;		/* hash queue */
-	CIRCLEQ_ENTRY(_bkt) q;		/* lru queue */
+	TAILQ_ENTRY(_bkt) hq;		/* hash queue */
+	TAILQ_ENTRY(_bkt) q;		/* lru queue */
 	void    *page;			/* page */
 	db_pgno_t   pgno;			/* page number */
 
@@ -59,9 +59,9 @@ typedef struct _bkt {
 } BKT;
 
 typedef struct MPOOL {
-	CIRCLEQ_HEAD(_lqh, _bkt) lqh;	/* lru queue head */
+	TAILQ_HEAD(_lqh, _bkt) lqh;	/* lru queue head */
 					/* hash queue array */
-	CIRCLEQ_HEAD(_hqh, _bkt) hqh[HASHSIZE];
+	TAILQ_HEAD(_hqh, _bkt) hqh[HASHSIZE];
 	db_pgno_t	curcache;		/* current number of cached pages */
 	db_pgno_t	maxcache;		/* max number of cached pages */
 	db_pgno_t	npages;			/* number of pages in the file */