Remove unused valDup (#443)

Remove the unused value duplicate API from dict. It's unused in the codebase and introduces unnecessary overhead. 

---------

Signed-off-by: Eran Liberty <eran.liberty@gmail.com>

src/cluster_legacy.c

@@ -144,7 +144,6 @@ static inline int defaultClientPort(void) {
 dictType clusterNodesDictType = {
     dictSdsHash,       /* hash function */
     NULL,              /* key dup */
-    NULL,              /* val dup */
     dictSdsKeyCompare, /* key compare */
     dictSdsDestructor, /* key destructor */
     NULL,              /* val destructor */
@@ -157,7 +156,6 @@ dictType clusterNodesDictType = {
 dictType clusterNodesBlackListDictType = {
     dictSdsCaseHash,       /* hash function */
     NULL,                  /* key dup */
-    NULL,                  /* val dup */
     dictSdsKeyCaseCompare, /* key compare */
     dictSdsDestructor,     /* key destructor */
     NULL,                  /* val destructor */
@@ -168,7 +166,6 @@ dictType clusterNodesBlackListDictType = {
 dictType clusterSdsToListType = {
     dictSdsHash,        /* hash function */
     NULL,               /* key dup */
-    NULL,               /* val dup */
     dictSdsKeyCompare,  /* key compare */
     dictSdsDestructor,  /* key destructor */
     dictListDestructor, /* val destructor */

src/config.c

@@ -986,7 +986,6 @@ void rewriteConfigSentinelOption(struct rewriteConfigState *state);
 dictType optionToLineDictType = {
     dictSdsCaseHash,       /* hash function */
     NULL,                  /* key dup */
-    NULL,                  /* val dup */
     dictSdsKeyCaseCompare, /* key compare */
     dictSdsDestructor,     /* key destructor */
     dictListDestructor,    /* val destructor */
@@ -996,7 +995,6 @@ dictType optionToLineDictType = {
 dictType optionSetDictType = {
     dictSdsCaseHash,       /* hash function */
     NULL,                  /* key dup */
-    NULL,                  /* val dup */
     dictSdsKeyCaseCompare, /* key compare */
     dictSdsDestructor,     /* key destructor */
     NULL,                  /* val destructor */

src/dict.c

@@ -48,6 +48,8 @@
 #include "serverassert.h"
 #include "monotonic.h"
 
+#define UNUSED(V) ((void)V)
+
 /* Using dictSetResizeEnabled() we make possible to disable
  * resizing and rehashing of the hash table as needed. This is very important
  * for us, as we use copy-on-write and don't want to move too much memory
@@ -800,8 +802,9 @@ void dictSetKey(dict *d, dictEntry *de, void *key) {
 }
 
 void dictSetVal(dict *d, dictEntry *de, void *val) {
+    UNUSED(d);
     assert(entryHasValue(de));
-    de->v.val = d->type->valDup ? d->type->valDup(d, val) : val;
+    de->v.val = val;
 }
 
 void dictSetSignedIntegerVal(dictEntry *de, int64_t val) {

src/dict.h

@@ -54,7 +54,6 @@ typedef struct dictType {
     /* Callbacks */
     uint64_t (*hashFunction)(const void *key);
     void *(*keyDup)(dict *d, const void *key);
-    void *(*valDup)(dict *d, const void *obj);
     int (*keyCompare)(dict *d, const void *key1, const void *key2);
     void (*keyDestructor)(dict *d, void *key);
     void (*valDestructor)(dict *d, void *obj);

src/eval.c

@@ -71,7 +71,6 @@ static uint64_t dictStrCaseHash(const void *key) {
 dictType shaScriptObjectDictType = {
     dictStrCaseHash,         /* hash function */
     NULL,                    /* key dup */
-    NULL,                    /* val dup */
     dictSdsKeyCaseCompare,   /* key compare */
     dictSdsDestructor,       /* key destructor */
     dictLuaScriptDestructor, /* val destructor */

src/expire.c

@@ -470,7 +470,6 @@ void rememberSlaveKeyWithExpire(serverDb *db, robj *key) {
         static dictType dt = {
             dictSdsHash,       /* hash function */
             NULL,              /* key dup */
-            NULL,              /* val dup */
             dictSdsKeyCompare, /* key compare */
             dictSdsDestructor, /* key destructor */
             NULL,              /* val destructor */

src/functions.c

@@ -65,7 +65,6 @@ typedef struct functionsLibMetaData {
 dictType engineDictType = {
     dictSdsCaseHash,       /* hash function */
     dictSdsDup,            /* key dup */
-    NULL,                  /* val dup */
     dictSdsKeyCaseCompare, /* key compare */
     dictSdsDestructor,     /* key destructor */
     NULL,                  /* val destructor */
@@ -75,7 +74,6 @@ dictType engineDictType = {
 dictType functionDictType = {
     dictSdsCaseHash,       /* hash function */
     dictSdsDup,            /* key dup */
-    NULL,                  /* val dup */
     dictSdsKeyCaseCompare, /* key compare */
     dictSdsDestructor,     /* key destructor */
     NULL,                  /* val destructor */
@@ -85,7 +83,6 @@ dictType functionDictType = {
 dictType engineStatsDictType = {
     dictSdsCaseHash,       /* hash function */
     dictSdsDup,            /* key dup */
-    NULL,                  /* val dup */
     dictSdsKeyCaseCompare, /* key compare */
     dictSdsDestructor,     /* key destructor */
     engineStatsDispose,    /* val destructor */
@@ -95,7 +92,6 @@ dictType engineStatsDictType = {
 dictType libraryFunctionDictType = {
     dictSdsHash,           /* hash function */
     dictSdsDup,            /* key dup */
-    NULL,                  /* val dup */
     dictSdsKeyCompare,     /* key compare */
     dictSdsDestructor,     /* key destructor */
     engineFunctionDispose, /* val destructor */
@@ -105,7 +101,6 @@ dictType libraryFunctionDictType = {
 dictType librariesDictType = {
     dictSdsHash,          /* hash function */
     dictSdsDup,           /* key dup */
-    NULL,                 /* val dup */
     dictSdsKeyCompare,    /* key compare */
     dictSdsDestructor,    /* key destructor */
     engineLibraryDispose, /* val destructor */

src/kvstore.c

@@ -794,8 +794,9 @@ void kvstoreDictSetKey(kvstore *kvs, int didx, dictEntry *de, void *key) {
 }
 
 void kvstoreDictSetVal(kvstore *kvs, int didx, dictEntry *de, void *val) {
-    dict *d = kvstoreGetDict(kvs, didx);
+    UNUSED(kvs);
-    dictSetVal(d, de, val);
+    UNUSED(didx);
+    dictSetVal(NULL, de, val);
 }
 
 dictEntry *

src/latency.c

@@ -51,7 +51,6 @@ void dictVanillaFree(dict *d, void *val);
 dictType latencyTimeSeriesDictType = {
     dictStringHash,       /* hash function */
     NULL,                 /* key dup */
-    NULL,                 /* val dup */
     dictStringKeyCompare, /* key compare */
     dictVanillaFree,      /* key destructor */
     dictVanillaFree,      /* val destructor */

src/module.c

@@ -11780,7 +11780,6 @@ int dictCStringKeyCompare(dict *d, const void *key1, const void *key2) {
 dictType moduleAPIDictType = {
     dictCStringKeyHash,    /* hash function */
     NULL,                  /* key dup */
-    NULL,                  /* val dup */
     dictCStringKeyCompare, /* key compare */
     NULL,                  /* key destructor */
     NULL,                  /* val destructor */
@@ -11811,7 +11810,6 @@ void moduleInitModulesSystemLast(void) {
 dictType sdsKeyValueHashDictType = {
     dictSdsCaseHash,       /* hash function */
     NULL,                  /* key dup */
-    NULL,                  /* val dup */
     dictSdsKeyCaseCompare, /* key compare */
     dictSdsDestructor,     /* key destructor */
     dictSdsDestructor,     /* val destructor */

src/sentinel.c

@@ -430,7 +430,6 @@ void dictInstancesValDestructor(dict *d, void *obj) {
 dictType instancesDictType = {
     dictSdsHash,                /* hash function */
     NULL,                       /* key dup */
-    NULL,                       /* val dup */
     dictSdsKeyCompare,          /* key compare */
     NULL,                       /* key destructor */
     dictInstancesValDestructor, /* val destructor */
@@ -444,7 +443,6 @@ dictType instancesDictType = {
 dictType leaderVotesDictType = {
     dictSdsHash,       /* hash function */
     NULL,              /* key dup */
-    NULL,              /* val dup */
     dictSdsKeyCompare, /* key compare */
     NULL,              /* key destructor */
     NULL,              /* val destructor */
@@ -455,7 +453,6 @@ dictType leaderVotesDictType = {
 dictType renamedCommandsDictType = {
     dictSdsCaseHash,       /* hash function */
     NULL,                  /* key dup */
-    NULL,                  /* val dup */
     dictSdsKeyCaseCompare, /* key compare */
     dictSdsDestructor,     /* key destructor */
     dictSdsDestructor,     /* val destructor */

src/server.c

@@ -424,7 +424,6 @@ int dictResizeAllowed(size_t moreMem, double usedRatio) {
 dictType objectKeyPointerValueDictType = {
     dictEncObjHash,       /* hash function */
     NULL,                 /* key dup */
-    NULL,                 /* val dup */
     dictEncObjKeyCompare, /* key compare */
     dictObjectDestructor, /* key destructor */
     NULL,                 /* val destructor */
@@ -436,7 +435,6 @@ dictType objectKeyPointerValueDictType = {
 dictType objectKeyHeapPointerValueDictType = {
     dictEncObjHash,       /* hash function */
     NULL,                 /* key dup */
-    NULL,                 /* val dup */
     dictEncObjKeyCompare, /* key compare */
     dictObjectDestructor, /* key destructor */
     dictVanillaFree,      /* val destructor */
@@ -447,7 +445,6 @@ dictType objectKeyHeapPointerValueDictType = {
 dictType setDictType = {
     dictSdsHash,       /* hash function */
     NULL,              /* key dup */
-    NULL,              /* val dup */
     dictSdsKeyCompare, /* key compare */
     dictSdsDestructor, /* key destructor */
     NULL,              /* val destructor */
@@ -460,7 +457,6 @@ dictType setDictType = {
 dictType zsetDictType = {
     dictSdsHash,       /* hash function */
     NULL,              /* key dup */
-    NULL,              /* val dup */
     dictSdsKeyCompare, /* key compare */
     NULL,              /* Note: SDS string shared & freed by skiplist */
     NULL,              /* val destructor */
@@ -471,7 +467,6 @@ dictType zsetDictType = {
 dictType dbDictType = {
     dictSdsHash,          /* hash function */
     NULL,                 /* key dup */
-    NULL,                 /* val dup */
     dictSdsKeyCompare,    /* key compare */
     dictSdsDestructor,    /* key destructor */
     dictObjectDestructor, /* val destructor */
@@ -482,7 +477,6 @@ dictType dbDictType = {
 dictType dbExpiresDictType = {
     dictSdsHash,       /* hash function */
     NULL,              /* key dup */
-    NULL,              /* val dup */
     dictSdsKeyCompare, /* key compare */
     NULL,              /* key destructor */
     NULL,              /* val destructor */
@@ -493,7 +487,6 @@ dictType dbExpiresDictType = {
 dictType commandTableDictType = {
     dictSdsCaseHash,       /* hash function */
     NULL,                  /* key dup */
-    NULL,                  /* val dup */
     dictSdsKeyCaseCompare, /* key compare */
     dictSdsDestructor,     /* key destructor */
     NULL,                  /* val destructor */
@@ -504,7 +497,6 @@ dictType commandTableDictType = {
 dictType hashDictType = {
     dictSdsHash,       /* hash function */
     NULL,              /* key dup */
-    NULL,              /* val dup */
     dictSdsKeyCompare, /* key compare */
     dictSdsDestructor, /* key destructor */
     dictSdsDestructor, /* val destructor */
@@ -515,7 +507,6 @@ dictType hashDictType = {
 dictType sdsReplyDictType = {
     dictSdsHash,       /* hash function */
     NULL,              /* key dup */
-    NULL,              /* val dup */
     dictSdsKeyCompare, /* key compare */
     NULL,              /* key destructor */
     NULL,              /* val destructor */
@@ -528,7 +519,6 @@ dictType sdsReplyDictType = {
 dictType keylistDictType = {
     dictObjHash,          /* hash function */
     NULL,                 /* key dup */
-    NULL,                 /* val dup */
     dictObjKeyCompare,    /* key compare */
     dictObjectDestructor, /* key destructor */
     dictListDestructor,   /* val destructor */
@@ -540,7 +530,6 @@ dictType keylistDictType = {
 dictType objToDictDictType = {
     dictObjHash,          /* hash function */
     NULL,                 /* key dup */
-    NULL,                 /* val dup */
     dictObjKeyCompare,    /* key compare */
     dictObjectDestructor, /* key destructor */
     dictDictDestructor,   /* val destructor */
@@ -552,7 +541,6 @@ dictType objToDictDictType = {
 dictType modulesDictType = {
     dictSdsCaseHash,       /* hash function */
     NULL,                  /* key dup */
-    NULL,                  /* val dup */
     dictSdsKeyCaseCompare, /* key compare */
     dictSdsDestructor,     /* key destructor */
     NULL,                  /* val destructor */
@@ -563,7 +551,6 @@ dictType modulesDictType = {
 dictType migrateCacheDictType = {
     dictSdsHash,       /* hash function */
     NULL,              /* key dup */
-    NULL,              /* val dup */
     dictSdsKeyCompare, /* key compare */
     dictSdsDestructor, /* key destructor */
     NULL,              /* val destructor */
@@ -575,7 +562,6 @@ dictType migrateCacheDictType = {
 dictType stringSetDictType = {
     dictCStrCaseHash,       /* hash function */
     NULL,                   /* key dup */
-    NULL,                   /* val dup */
     dictCStrKeyCaseCompare, /* key compare */
     dictSdsDestructor,      /* key destructor */
     NULL,                   /* val destructor */
@@ -587,7 +573,6 @@ dictType stringSetDictType = {
 dictType externalStringType = {
     dictCStrCaseHash,       /* hash function */
     NULL,                   /* key dup */
-    NULL,                   /* val dup */
     dictCStrKeyCaseCompare, /* key compare */
     NULL,                   /* key destructor */
     NULL,                   /* val destructor */
@@ -599,7 +584,6 @@ dictType externalStringType = {
 dictType sdsHashDictType = {
     dictSdsCaseHash,       /* hash function */
     NULL,                  /* key dup */
-    NULL,                  /* val dup */
     dictSdsKeyCaseCompare, /* key compare */
     dictSdsDestructor,     /* key destructor */
     dictVanillaFree,       /* val destructor */
@@ -610,7 +594,6 @@ dictType sdsHashDictType = {
 dictType clientDictType = {
     dictClientHash,       /* hash function */
     NULL,                 /* key dup */
-    NULL,                 /* val dup */
     dictClientKeyCompare, /* key compare */
     .no_value = 1         /* no values in this dict */
 };

src/t_zset.c

@@ -2527,7 +2527,6 @@ static void zdiff(zsetopsrc *src, long setnum, zset *dstzset, size_t *maxelelen,
 dictType setAccumulatorDictType = {
     dictSdsHash,       /* hash function */
     NULL,              /* key dup */
-    NULL,              /* val dup */
     dictSdsKeyCompare, /* key compare */
     NULL,              /* key destructor */
     NULL,              /* val destructor */

src/unit/test_kvstore.c

@@ -10,7 +10,7 @@ void freeTestCallback(dict *d, void *val) {
     zfree(val);
 }
 
-dictType KvstoreDictTestType = {hashTestCallback, NULL, NULL, NULL, freeTestCallback, NULL, NULL};
+dictType KvstoreDictTestType = {hashTestCallback, NULL, NULL, freeTestCallback, NULL, NULL};
 
 char *stringFromInt(int value) {
     char buf[32];

src/valkey-benchmark.c

@@ -1243,7 +1243,6 @@ static int fetchClusterSlotsConfiguration(client c) {
     static dictType dtype = {
         dictSdsHash,       /* hash function */
         NULL,              /* key dup */
-        NULL,              /* val dup */
         dictSdsKeyCompare, /* key compare */
         NULL,              /* key destructor */
         NULL,              /* val destructor */

src/valkey-cli.c

@@ -882,7 +882,6 @@ static void cliInitHelp(void) {
     dictType groupsdt = {
         dictSdsHash,       /* hash function */
         NULL,              /* key dup */
-        NULL,              /* val dup */
         dictSdsKeyCompare, /* key compare */
         dictSdsDestructor, /* key destructor */
         NULL,              /* val destructor */
@@ -3544,7 +3543,6 @@ typedef struct clusterManagerLink {
 static dictType clusterManagerDictType = {
     dictSdsHash,       /* hash function */
     NULL,              /* key dup */
-    NULL,              /* val dup */
     dictSdsKeyCompare, /* key compare */
     NULL,              /* key destructor */
     dictSdsDestructor, /* val destructor */
@@ -3554,7 +3552,6 @@ static dictType clusterManagerDictType = {
 static dictType clusterManagerLinkDictType = {
     dictSdsHash,        /* hash function */
     NULL,               /* key dup */
-    NULL,               /* val dup */
     dictSdsKeyCompare,  /* key compare */
     dictSdsDestructor,  /* key destructor */
     dictListDestructor, /* val destructor */
@@ -8628,7 +8625,6 @@ void type_free(dict *d, void *val) {
 static dictType typeinfoDictType = {
     dictSdsHash,       /* hash function */
     NULL,              /* key dup */
-    NULL,              /* val dup */
     dictSdsKeyCompare, /* key compare */
     NULL,              /* key destructor (owned by the value)*/
     type_free,         /* val destructor */