Silence compiler warnings
Rearrange a bit of code to ensure that 'mode' in LWLockRelease is obviously always set, which seems a bit cleaner and avoids a compiler warning (thanks to Robert for the suggestion!). In GetCachedPlan(), initialize 'plan' to silence a compiler warning, but also add an Assert() to make sure we don't ever actually fall through with 'plan' still being set to NULL, since we are about to dereference it. Neither of these appear to be live bugs but at least gcc 5.4.0-6ubuntu1~16.04.4 doesn't quite have the smarts to realize that. Discussion: https://www.postgresql.org/message-id/20161129152102.GR13284%40tamriel.snowman.net
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@ -1780,15 +1780,14 @@ LWLockRelease(LWLock *lock)
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* be the latest-acquired lock; so search array backwards.
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*/
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for (i = num_held_lwlocks; --i >= 0;)
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{
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if (lock == held_lwlocks[i].lock)
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{
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mode = held_lwlocks[i].mode;
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break;
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}
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}
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if (i < 0)
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elog(ERROR, "lock %s %d is not held", T_NAME(lock), T_ID(lock));
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mode = held_lwlocks[i].mode;
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num_held_lwlocks--;
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for (; i < num_held_lwlocks; i++)
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held_lwlocks[i] = held_lwlocks[i + 1];
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@ -1128,7 +1128,7 @@ CachedPlan *
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GetCachedPlan(CachedPlanSource *plansource, ParamListInfo boundParams,
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bool useResOwner)
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{
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CachedPlan *plan;
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CachedPlan *plan = NULL;
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List *qlist;
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bool customplan;
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@ -1210,6 +1210,8 @@ GetCachedPlan(CachedPlanSource *plansource, ParamListInfo boundParams,
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}
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}
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Assert(plan != NULL);
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/* Flag the plan as in use by caller */
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if (useResOwner)
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ResourceOwnerEnlargePlanCacheRefs(CurrentResourceOwner);
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