Have LookupFuncName accept NULL argtypes for 0 args
Prior to this change, it requires to be passed a valid pointer just to
be able to pass it to a zero-byte memcmp, per 0a52d378b0
. Given the
strange resulting code in callsites, it seems better to test for the
case specifically and remove the requirement.
Reported-by: Ranier Vilela
Discussion: https://postgr.es/m/MN2PR18MB2927F24692485D754794F01BE3740@MN2PR18MB2927.namprd18.prod.outlook.com
Discussion: https://postgr.es/m/MN2PR18MB2927F6873DF2774A505AC298E3740@MN2PR18MB2927.namprd18.prod.outlook.com
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@ -171,7 +171,6 @@ CreateEventTrigger(CreateEventTrigStmt *stmt)
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HeapTuple tuple;
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Oid funcoid;
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Oid funcrettype;
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Oid fargtypes[1]; /* dummy */
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Oid evtowner = GetUserId();
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ListCell *lc;
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List *tags = NULL;
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@ -237,7 +236,7 @@ CreateEventTrigger(CreateEventTrigStmt *stmt)
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stmt->trigname)));
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/* Find and validate the trigger function. */
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funcoid = LookupFuncName(stmt->funcname, 0, fargtypes, false);
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funcoid = LookupFuncName(stmt->funcname, 0, NULL, false);
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funcrettype = get_func_rettype(funcoid);
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if (funcrettype != EVTTRIGGEROID)
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ereport(ERROR,
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@ -475,13 +475,12 @@ static Oid
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lookup_fdw_handler_func(DefElem *handler)
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{
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Oid handlerOid;
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Oid funcargtypes[1]; /* dummy */
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if (handler == NULL || handler->arg == NULL)
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return InvalidOid;
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/* handlers have no arguments */
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handlerOid = LookupFuncName((List *) handler->arg, 0, funcargtypes, false);
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handlerOid = LookupFuncName((List *) handler->arg, 0, NULL, false);
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/* check that handler has correct return type */
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if (get_func_rettype(handlerOid) != FDW_HANDLEROID)
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@ -105,7 +105,7 @@ CreateProceduralLanguage(CreatePLangStmt *stmt)
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* return type.
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*/
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funcname = SystemFuncName(pltemplate->tmplhandler);
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handlerOid = LookupFuncName(funcname, 0, funcargtypes, true);
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handlerOid = LookupFuncName(funcname, 0, NULL, true);
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if (OidIsValid(handlerOid))
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{
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funcrettype = get_func_rettype(handlerOid);
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@ -263,7 +263,7 @@ CreateProceduralLanguage(CreatePLangStmt *stmt)
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* Lookup the PL handler function and check that it is of the expected
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* return type
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*/
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handlerOid = LookupFuncName(stmt->plhandler, 0, funcargtypes, false);
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handlerOid = LookupFuncName(stmt->plhandler, 0, NULL, false);
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funcrettype = get_func_rettype(handlerOid);
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if (funcrettype != LANGUAGE_HANDLEROID)
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{
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@ -179,7 +179,6 @@ CreateTrigger(CreateTrigStmt *stmt, const char *queryString,
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ScanKeyData key;
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Relation pgrel;
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HeapTuple tuple;
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Oid fargtypes[1]; /* dummy */
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Oid funcrettype;
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Oid trigoid;
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char internaltrigname[NAMEDATALEN];
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@ -690,7 +689,7 @@ CreateTrigger(CreateTrigStmt *stmt, const char *queryString,
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* Find and validate the trigger function.
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*/
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if (!OidIsValid(funcoid))
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funcoid = LookupFuncName(stmt->funcname, 0, fargtypes, false);
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funcoid = LookupFuncName(stmt->funcname, 0, NULL, false);
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if (!isInternal)
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{
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aclresult = pg_proc_aclcheck(funcoid, GetUserId(), ACL_EXECUTE);
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@ -2035,8 +2035,8 @@ LookupFuncNameInternal(List *funcname, int nargs, const Oid *argtypes,
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{
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FuncCandidateList clist;
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/* Passing NULL for argtypes is no longer allowed */
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Assert(argtypes);
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/* NULL argtypes allowed for nullary functions only */
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Assert(argtypes != NULL || nargs == 0);
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/* Always set *lookupError, to forestall uninitialized-variable warnings */
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*lookupError = FUNCLOOKUP_NOSUCHFUNC;
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@ -2070,7 +2070,9 @@ LookupFuncNameInternal(List *funcname, int nargs, const Oid *argtypes,
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*/
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while (clist)
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{
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if (memcmp(argtypes, clist->args, nargs * sizeof(Oid)) == 0)
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/* if nargs==0, argtypes can be null; don't pass that to memcmp */
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if (nargs == 0 ||
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memcmp(argtypes, clist->args, nargs * sizeof(Oid)) == 0)
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return clist->oid;
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clist = clist->next;
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}
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@ -592,7 +592,6 @@ call_pltcl_start_proc(Oid prolang, bool pltrusted)
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const char *gucname;
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ErrorContextCallback errcallback;
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List *namelist;
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Oid fargtypes[1]; /* dummy */
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Oid procOid;
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HeapTuple procTup;
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Form_pg_proc procStruct;
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@ -616,7 +615,7 @@ call_pltcl_start_proc(Oid prolang, bool pltrusted)
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/* Parse possibly-qualified identifier and look up the function */
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namelist = stringToQualifiedNameList(start_proc);
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procOid = LookupFuncName(namelist, 0, fargtypes, false);
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procOid = LookupFuncName(namelist, 0, NULL, false);
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/* Current user must have permission to call function */
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aclresult = pg_proc_aclcheck(procOid, GetUserId(), ACL_EXECUTE);
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