src/backend/catalog/pg_proc.c

   1 /*-------------------------------------------------------------------------
   2  *
   3  * pg_proc.c
   4  *        routines to support manipulation of the pg_proc relation
   5  *
   6  * Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
   7  * Portions Copyright (c) 1994, Regents of the University of California
   8  *
   9  *
  10  * IDENTIFICATION
  11  *        src/backend/catalog/pg_proc.c
  12  *
  13  *-------------------------------------------------------------------------
  14  */
  15 #include "postgres.h"
  16
  17 #include "access/heapam.h"
  18 #include "access/xact.h"
  19 #include "catalog/dependency.h"
  20 #include "catalog/indexing.h"
  21 #include "catalog/objectaccess.h"
  22 #include "catalog/pg_language.h"
  23 #include "catalog/pg_namespace.h"
  24 #include "catalog/pg_proc.h"
  25 #include "catalog/pg_proc_fn.h"
  26 #include "catalog/pg_type.h"
  27 #include "executor/functions.h"
  28 #include "funcapi.h"
  29 #include "mb/pg_wchar.h"
  30 #include "miscadmin.h"
  31 #include "nodes/nodeFuncs.h"
  32 #include "parser/parse_type.h"
  33 #include "tcop/pquery.h"
  34 #include "tcop/tcopprot.h"
  35 #include "utils/acl.h"
  36 #include "utils/builtins.h"
  37 #include "utils/lsyscache.h"
  38 #include "utils/syscache.h"
  39
  40
  41 Datum           fmgr_internal_validator(PG_FUNCTION_ARGS);
  42 Datum           fmgr_c_validator(PG_FUNCTION_ARGS);
  43 Datum           fmgr_sql_validator(PG_FUNCTION_ARGS);
  44
  45 typedef struct
  46 {
  47         char       *proname;
  48         char       *prosrc;
  49 } parse_error_callback_arg;
  50
  51 static void sql_function_parse_error_callback(void *arg);
  52 static int match_prosrc_to_query(const char *prosrc, const char *queryText,
  53                                           int cursorpos);
  54 static bool match_prosrc_to_literal(const char *prosrc, const char *literal,
  55                                                 int cursorpos, int *newcursorpos);
  56
  57
  58 /* ----------------------------------------------------------------
  59  *              ProcedureCreate
  60  *
  61  * Note: allParameterTypes, parameterModes, parameterNames, and proconfig
  62  * are either arrays of the proper types or NULL.  We declare them Datum,
  63  * not "ArrayType *", to avoid importing array.h into pg_proc_fn.h.
  64  * ----------------------------------------------------------------
  65  */
  66 Oid
  67 ProcedureCreate(const char *procedureName,
  68                                 Oid procNamespace,
  69                                 bool replace,
  70                                 bool returnsSet,
  71                                 Oid returnType,
  72                                 Oid languageObjectId,
  73                                 Oid languageValidator,
  74                                 const char *prosrc,
  75                                 const char *probin,
  76                                 bool isAgg,
  77                                 bool isWindowFunc,
  78                                 bool security_definer,
  79                                 bool isStrict,
  80                                 char volatility,
  81                                 oidvector *parameterTypes,
  82                                 Datum allParameterTypes,
  83                                 Datum parameterModes,
  84                                 Datum parameterNames,
  85                                 List *parameterDefaults,
  86                                 Datum proconfig,
  87                                 float4 procost,
  88                                 float4 prorows)
  89 {
  90         Oid                     retval;
  91         int                     parameterCount;
  92         int                     allParamCount;
  93         Oid                *allParams;
  94         bool            genericInParam = false;
  95         bool            genericOutParam = false;
  96         bool            internalInParam = false;
  97         bool            internalOutParam = false;
  98         Oid                     variadicType = InvalidOid;
  99         Oid                     proowner = GetUserId();
 100         Acl                *proacl = NULL;
 101         Relation        rel;
 102         HeapTuple       tup;
 103         HeapTuple       oldtup;
 104         bool            nulls[Natts_pg_proc];
 105         Datum           values[Natts_pg_proc];
 106         bool            replaces[Natts_pg_proc];
 107         Oid                     relid;
 108         NameData        procname;
 109         TupleDesc       tupDesc;
 110         bool            is_update;
 111         ObjectAddress myself,
 112                                 referenced;
 113         int                     i;
 114
 115         /*
 116          * sanity checks
 117          */
 118         Assert(PointerIsValid(prosrc));
 119
 120         parameterCount = parameterTypes->dim1;
 121         if (parameterCount < 0 || parameterCount > FUNC_MAX_ARGS)
 122                 ereport(ERROR,
 123                                 (errcode(ERRCODE_TOO_MANY_ARGUMENTS),
 124                                  errmsg_plural("functions cannot have more than %d argument",
 125                                                            "functions cannot have more than %d arguments",
 126                                                            FUNC_MAX_ARGS,
 127                                                            FUNC_MAX_ARGS)));
 128         /* note: the above is correct, we do NOT count output arguments */
 129
 130         if (allParameterTypes != PointerGetDatum(NULL))
 131         {
 132                 /*
 133                  * We expect the array to be a 1-D OID array; verify that. We don't
 134                  * need to use deconstruct_array() since the array data is just going
 135                  * to look like a C array of OID values.
 136                  */
 137                 ArrayType  *allParamArray = (ArrayType *) DatumGetPointer(allParameterTypes);
 138
 139                 allParamCount = ARR_DIMS(allParamArray)[0];
 140                 if (ARR_NDIM(allParamArray) != 1 ||
 141                         allParamCount <= 0 ||
 142                         ARR_HASNULL(allParamArray) ||
 143                         ARR_ELEMTYPE(allParamArray) != OIDOID)
 144                         elog(ERROR, "allParameterTypes is not a 1-D Oid array");
 145                 allParams = (Oid *) ARR_DATA_PTR(allParamArray);
 146                 Assert(allParamCount >= parameterCount);
 147                 /* we assume caller got the contents right */
 148         }
 149         else
 150         {
 151                 allParamCount = parameterCount;
 152                 allParams = parameterTypes->values;
 153         }
 154
 155         /*
 156          * Do not allow polymorphic return type unless at least one input argument
 157          * is polymorphic.      Also, do not allow return type INTERNAL unless at
 158          * least one input argument is INTERNAL.
 159          */
 160         for (i = 0; i < parameterCount; i++)
 161         {
 162                 switch (parameterTypes->values[i])
 163                 {
 164                         case ANYARRAYOID:
 165                         case ANYELEMENTOID:
 166                         case ANYNONARRAYOID:
 167                         case ANYENUMOID:
 168                                 genericInParam = true;
 169                                 break;
 170                         case INTERNALOID:
 171                                 internalInParam = true;
 172                                 break;
 173                 }
 174         }
 175
 176         if (allParameterTypes != PointerGetDatum(NULL))
 177         {
 178                 for (i = 0; i < allParamCount; i++)
 179                 {
 180                         /*
 181                          * We don't bother to distinguish input and output params here, so
 182                          * if there is, say, just an input INTERNAL param then we will
 183                          * still set internalOutParam.  This is OK since we don't really
 184                          * care.
 185                          */
 186                         switch (allParams[i])
 187                         {
 188                                 case ANYARRAYOID:
 189                                 case ANYELEMENTOID:
 190                                 case ANYNONARRAYOID:
 191                                 case ANYENUMOID:
 192                                         genericOutParam = true;
 193                                         break;
 194                                 case INTERNALOID:
 195                                         internalOutParam = true;
 196                                         break;
 197                         }
 198                 }
 199         }
 200
 201         if ((IsPolymorphicType(returnType) || genericOutParam)
 202                 && !genericInParam)
 203                 ereport(ERROR,
 204                                 (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
 205                                  errmsg("cannot determine result data type"),
 206                                  errdetail("A function returning a polymorphic type must have at least one polymorphic argument.")));
 207
 208         if ((returnType == INTERNALOID || internalOutParam) && !internalInParam)
 209                 ereport(ERROR,
 210                                 (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
 211                                  errmsg("unsafe use of pseudo-type \"internal\""),
 212                                  errdetail("A function returning \"internal\" must have at least one \"internal\" argument.")));
 213
 214         /*
 215          * don't allow functions of complex types that have the same name as
 216          * existing attributes of the type
 217          */
 218         if (parameterCount == 1 &&
 219                 OidIsValid(parameterTypes->values[0]) &&
 220                 (relid = typeidTypeRelid(parameterTypes->values[0])) != InvalidOid &&
 221                 get_attnum(relid, procedureName) != InvalidAttrNumber)
 222                 ereport(ERROR,
 223                                 (errcode(ERRCODE_DUPLICATE_COLUMN),
 224                                  errmsg("\"%s\" is already an attribute of type %s",
 225                                                 procedureName,
 226                                                 format_type_be(parameterTypes->values[0]))));
 227
 228         if (parameterModes != PointerGetDatum(NULL))
 229         {
 230                 /*
 231                  * We expect the array to be a 1-D CHAR array; verify that. We don't
 232                  * need to use deconstruct_array() since the array data is just going
 233                  * to look like a C array of char values.
 234                  */
 235                 ArrayType  *modesArray = (ArrayType *) DatumGetPointer(parameterModes);
 236                 char       *modes;
 237
 238                 if (ARR_NDIM(modesArray) != 1 ||
 239                         ARR_DIMS(modesArray)[0] != allParamCount ||
 240                         ARR_HASNULL(modesArray) ||
 241                         ARR_ELEMTYPE(modesArray) != CHAROID)
 242                         elog(ERROR, "parameterModes is not a 1-D char array");
 243                 modes = (char *) ARR_DATA_PTR(modesArray);
 244
 245                 /*
 246                  * Only the last input parameter can be variadic; if it is, save its
 247                  * element type.  Errors here are just elog since caller should have
 248                  * checked this already.
 249                  */
 250                 for (i = 0; i < allParamCount; i++)
 251                 {
 252                         switch (modes[i])
 253                         {
 254                                 case PROARGMODE_IN:
 255                                 case PROARGMODE_INOUT:
 256                                         if (OidIsValid(variadicType))
 257                                                 elog(ERROR, "variadic parameter must be last");
 258                                         break;
 259                                 case PROARGMODE_OUT:
 260                                 case PROARGMODE_TABLE:
 261                                         /* okay */
 262                                         break;
 263                                 case PROARGMODE_VARIADIC:
 264                                         if (OidIsValid(variadicType))
 265                                                 elog(ERROR, "variadic parameter must be last");
 266                                         switch (allParams[i])
 267                                         {
 268                                                 case ANYOID:
 269                                                         variadicType = ANYOID;
 270                                                         break;
 271                                                 case ANYARRAYOID:
 272                                                         variadicType = ANYELEMENTOID;
 273                                                         break;
 274                                                 default:
 275                                                         variadicType = get_element_type(allParams[i]);
 276                                                         if (!OidIsValid(variadicType))
 277                                                                 elog(ERROR, "variadic parameter is not an array");
 278                                                         break;
 279                                         }
 280                                         break;
 281                                 default:
 282                                         elog(ERROR, "invalid parameter mode '%c'", modes[i]);
 283                                         break;
 284                         }
 285                 }
 286         }
 287
 288         /*
 289          * All seems OK; prepare the data to be inserted into pg_proc.
 290          */
 291
 292         for (i = 0; i < Natts_pg_proc; ++i)
 293         {
 294                 nulls[i] = false;
 295                 values[i] = (Datum) 0;
 296                 replaces[i] = true;
 297         }
 298
 299         namestrcpy(&procname, procedureName);
 300         values[Anum_pg_proc_proname - 1] = NameGetDatum(&procname);
 301         values[Anum_pg_proc_pronamespace - 1] = ObjectIdGetDatum(procNamespace);
 302         values[Anum_pg_proc_proowner - 1] = ObjectIdGetDatum(proowner);
 303         values[Anum_pg_proc_prolang - 1] = ObjectIdGetDatum(languageObjectId);
 304         values[Anum_pg_proc_procost - 1] = Float4GetDatum(procost);
 305         values[Anum_pg_proc_prorows - 1] = Float4GetDatum(prorows);
 306         values[Anum_pg_proc_provariadic - 1] = ObjectIdGetDatum(variadicType);
 307         values[Anum_pg_proc_proisagg - 1] = BoolGetDatum(isAgg);
 308         values[Anum_pg_proc_proiswindow - 1] = BoolGetDatum(isWindowFunc);
 309         values[Anum_pg_proc_prosecdef - 1] = BoolGetDatum(security_definer);
 310         values[Anum_pg_proc_proisstrict - 1] = BoolGetDatum(isStrict);
 311         values[Anum_pg_proc_proretset - 1] = BoolGetDatum(returnsSet);
 312         values[Anum_pg_proc_provolatile - 1] = CharGetDatum(volatility);
 313         values[Anum_pg_proc_pronargs - 1] = UInt16GetDatum(parameterCount);
 314         values[Anum_pg_proc_pronargdefaults - 1] = UInt16GetDatum(list_length(parameterDefaults));
 315         values[Anum_pg_proc_prorettype - 1] = ObjectIdGetDatum(returnType);
 316         values[Anum_pg_proc_proargtypes - 1] = PointerGetDatum(parameterTypes);
 317         if (allParameterTypes != PointerGetDatum(NULL))
 318                 values[Anum_pg_proc_proallargtypes - 1] = allParameterTypes;
 319         else
 320                 nulls[Anum_pg_proc_proallargtypes - 1] = true;
 321         if (parameterModes != PointerGetDatum(NULL))
 322                 values[Anum_pg_proc_proargmodes - 1] = parameterModes;
 323         else
 324                 nulls[Anum_pg_proc_proargmodes - 1] = true;
 325         if (parameterNames != PointerGetDatum(NULL))
 326                 values[Anum_pg_proc_proargnames - 1] = parameterNames;
 327         else
 328                 nulls[Anum_pg_proc_proargnames - 1] = true;
 329         if (parameterDefaults != NIL)
 330                 values[Anum_pg_proc_proargdefaults - 1] = CStringGetTextDatum(nodeToString(parameterDefaults));
 331         else
 332                 nulls[Anum_pg_proc_proargdefaults - 1] = true;
 333         values[Anum_pg_proc_prosrc - 1] = CStringGetTextDatum(prosrc);
 334         if (probin)
 335                 values[Anum_pg_proc_probin - 1] = CStringGetTextDatum(probin);
 336         else
 337                 nulls[Anum_pg_proc_probin - 1] = true;
 338         if (proconfig != PointerGetDatum(NULL))
 339                 values[Anum_pg_proc_proconfig - 1] = proconfig;
 340         else
 341                 nulls[Anum_pg_proc_proconfig - 1] = true;
 342         /* proacl will be determined later */
 343
 344         rel = heap_open(ProcedureRelationId, RowExclusiveLock);
 345         tupDesc = RelationGetDescr(rel);
 346
 347         /* Check for pre-existing definition */
 348         oldtup = SearchSysCache3(PROCNAMEARGSNSP,
 349                                                          PointerGetDatum(procedureName),
 350                                                          PointerGetDatum(parameterTypes),
 351                                                          ObjectIdGetDatum(procNamespace));
 352
 353         if (HeapTupleIsValid(oldtup))
 354         {
 355                 /* There is one; okay to replace it? */
 356                 Form_pg_proc oldproc = (Form_pg_proc) GETSTRUCT(oldtup);
 357                 Datum           proargnames;
 358                 bool            isnull;
 359
 360                 if (!replace)
 361                         ereport(ERROR,
 362                                         (errcode(ERRCODE_DUPLICATE_FUNCTION),
 363                         errmsg("function \"%s\" already exists with same argument types",
 364                                    procedureName)));
 365                 if (!pg_proc_ownercheck(HeapTupleGetOid(oldtup), proowner))
 366                         aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_PROC,
 367                                                    procedureName);
 368
 369                 /*
 370                  * Not okay to change the return type of the existing proc, since
 371                  * existing rules, views, etc may depend on the return type.
 372                  */
 373                 if (returnType != oldproc->prorettype ||
 374                         returnsSet != oldproc->proretset)
 375                         ereport(ERROR,
 376                                         (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
 377                                          errmsg("cannot change return type of existing function"),
 378                                          errhint("Use DROP FUNCTION first.")));
 379
 380                 /*
 381                  * If it returns RECORD, check for possible change of record type
 382                  * implied by OUT parameters
 383                  */
 384                 if (returnType == RECORDOID)
 385                 {
 386                         TupleDesc       olddesc;
 387                         TupleDesc       newdesc;
 388
 389                         olddesc = build_function_result_tupdesc_t(oldtup);
 390                         newdesc = build_function_result_tupdesc_d(allParameterTypes,
 391                                                                                                           parameterModes,
 392                                                                                                           parameterNames);
 393                         if (olddesc == NULL && newdesc == NULL)
 394                                  /* ok, both are runtime-defined RECORDs */ ;
 395                         else if (olddesc == NULL || newdesc == NULL ||
 396                                          !equalTupleDescs(olddesc, newdesc))
 397                                 ereport(ERROR,
 398                                                 (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
 399                                         errmsg("cannot change return type of existing function"),
 400                                 errdetail("Row type defined by OUT parameters is different."),
 401                                                  errhint("Use DROP FUNCTION first.")));
 402                 }
 403
 404                 /*
 405                  * If there were any named input parameters, check to make sure the
 406                  * names have not been changed, as this could break existing calls. We
 407                  * allow adding names to formerly unnamed parameters, though.
 408                  */
 409                 proargnames = SysCacheGetAttr(PROCNAMEARGSNSP, oldtup,
 410                                                                           Anum_pg_proc_proargnames,
 411                                                                           &isnull);
 412                 if (!isnull)
 413                 {
 414                         Datum           proargmodes;
 415                         char      **old_arg_names;
 416                         char      **new_arg_names;
 417                         int                     n_old_arg_names;
 418                         int                     n_new_arg_names;
 419                         int                     j;
 420
 421                         proargmodes = SysCacheGetAttr(PROCNAMEARGSNSP, oldtup,
 422                                                                                   Anum_pg_proc_proargmodes,
 423                                                                                   &isnull);
 424                         if (isnull)
 425                                 proargmodes = PointerGetDatum(NULL);    /* just to be sure */
 426
 427                         n_old_arg_names = get_func_input_arg_names(proargnames,
 428                                                                                                            proargmodes,
 429                                                                                                            &old_arg_names);
 430                         n_new_arg_names = get_func_input_arg_names(parameterNames,
 431                                                                                                            parameterModes,
 432                                                                                                            &new_arg_names);
 433                         for (j = 0; j < n_old_arg_names; j++)
 434                         {
 435                                 if (old_arg_names[j] == NULL)
 436                                         continue;
 437                                 if (j >= n_new_arg_names || new_arg_names[j] == NULL ||
 438                                         strcmp(old_arg_names[j], new_arg_names[j]) != 0)
 439                                         ereport(ERROR,
 440                                                         (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
 441                                            errmsg("cannot change name of input parameter \"%s\"",
 442                                                           old_arg_names[j]),
 443                                                          errhint("Use DROP FUNCTION first.")));
 444                         }
 445                 }
 446
 447                 /*
 448                  * If there are existing defaults, check compatibility: redefinition
 449                  * must not remove any defaults nor change their types.  (Removing a
 450                  * default might cause a function to fail to satisfy an existing call.
 451                  * Changing type would only be possible if the associated parameter is
 452                  * polymorphic, and in such cases a change of default type might alter
 453                  * the resolved output type of existing calls.)
 454                  */
 455                 if (oldproc->pronargdefaults != 0)
 456                 {
 457                         Datum           proargdefaults;
 458                         List       *oldDefaults;
 459                         ListCell   *oldlc;
 460                         ListCell   *newlc;
 461
 462                         if (list_length(parameterDefaults) < oldproc->pronargdefaults)
 463                                 ereport(ERROR,
 464                                                 (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
 465                                                  errmsg("cannot remove parameter defaults from existing function"),
 466                                                  errhint("Use DROP FUNCTION first.")));
 467
 468                         proargdefaults = SysCacheGetAttr(PROCNAMEARGSNSP, oldtup,
 469                                                                                          Anum_pg_proc_proargdefaults,
 470                                                                                          &isnull);
 471                         Assert(!isnull);
 472                         oldDefaults = (List *) stringToNode(TextDatumGetCString(proargdefaults));
 473                         Assert(IsA(oldDefaults, List));
 474                         Assert(list_length(oldDefaults) == oldproc->pronargdefaults);
 475
 476                         /* new list can have more defaults than old, advance over 'em */
 477                         newlc = list_head(parameterDefaults);
 478                         for (i = list_length(parameterDefaults) - oldproc->pronargdefaults;
 479                                  i > 0;
 480                                  i--)
 481                                 newlc = lnext(newlc);
 482
 483                         foreach(oldlc, oldDefaults)
 484                         {
 485                                 Node       *oldDef = (Node *) lfirst(oldlc);
 486                                 Node       *newDef = (Node *) lfirst(newlc);
 487
 488                                 if (exprType(oldDef) != exprType(newDef))
 489                                         ereport(ERROR,
 490                                                         (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
 491                                                          errmsg("cannot change data type of existing parameter default value"),
 492                                                          errhint("Use DROP FUNCTION first.")));
 493                                 newlc = lnext(newlc);
 494                         }
 495                 }
 496
 497                 /* Can't change aggregate or window-function status, either */
 498                 if (oldproc->proisagg != isAgg)
 499                 {
 500                         if (oldproc->proisagg)
 501                                 ereport(ERROR,
 502                                                 (errcode(ERRCODE_WRONG_OBJECT_TYPE),
 503                                                  errmsg("function \"%s\" is an aggregate function",
 504                                                                 procedureName)));
 505                         else
 506                                 ereport(ERROR,
 507                                                 (errcode(ERRCODE_WRONG_OBJECT_TYPE),
 508                                            errmsg("function \"%s\" is not an aggregate function",
 509                                                           procedureName)));
 510                 }
 511                 if (oldproc->proiswindow != isWindowFunc)
 512                 {
 513                         if (oldproc->proiswindow)
 514                                 ereport(ERROR,
 515                                                 (errcode(ERRCODE_WRONG_OBJECT_TYPE),
 516                                                  errmsg("function \"%s\" is a window function",
 517                                                                 procedureName)));
 518                         else
 519                                 ereport(ERROR,
 520                                                 (errcode(ERRCODE_WRONG_OBJECT_TYPE),
 521                                                  errmsg("function \"%s\" is not a window function",
 522                                                                 procedureName)));
 523                 }
 524
 525                 /*
 526                  * Do not change existing ownership or permissions, either.  Note
 527                  * dependency-update code below has to agree with this decision.
 528                  */
 529                 replaces[Anum_pg_proc_proowner - 1] = false;
 530                 replaces[Anum_pg_proc_proacl - 1] = false;
 531
 532                 /* Okay, do it... */
 533                 tup = heap_modify_tuple(oldtup, tupDesc, values, nulls, replaces);
 534                 simple_heap_update(rel, &tup->t_self, tup);
 535
 536                 ReleaseSysCache(oldtup);
 537                 is_update = true;
 538         }
 539         else
 540         {
 541                 /* Creating a new procedure */
 542
 543                 /* First, get default permissions and set up proacl */
 544                 proacl = get_user_default_acl(ACL_OBJECT_FUNCTION, proowner,
 545                                                                           procNamespace);
 546                 if (proacl != NULL)
 547                         values[Anum_pg_proc_proacl - 1] = PointerGetDatum(proacl);
 548                 else
 549                         nulls[Anum_pg_proc_proacl - 1] = true;
 550
 551                 tup = heap_form_tuple(tupDesc, values, nulls);
 552                 simple_heap_insert(rel, tup);
 553                 is_update = false;
 554         }
 555
 556         /* Need to update indexes for either the insert or update case */
 557         CatalogUpdateIndexes(rel, tup);
 558
 559         retval = HeapTupleGetOid(tup);
 560
 561         /*
 562          * Create dependencies for the new function.  If we are updating an
 563          * existing function, first delete any existing pg_depend entries.
 564          * (However, since we are not changing ownership or permissions, the
 565          * shared dependencies do *not* need to change, and we leave them alone.)
 566          */
 567         if (is_update)
 568                 deleteDependencyRecordsFor(ProcedureRelationId, retval);
 569
 570         myself.classId = ProcedureRelationId;
 571         myself.objectId = retval;
 572         myself.objectSubId = 0;
 573
 574         /* dependency on namespace */
 575         referenced.classId = NamespaceRelationId;
 576         referenced.objectId = procNamespace;
 577         referenced.objectSubId = 0;
 578         recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
 579
 580         /* dependency on implementation language */
 581         referenced.classId = LanguageRelationId;
 582         referenced.objectId = languageObjectId;
 583         referenced.objectSubId = 0;
 584         recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
 585
 586         /* dependency on return type */
 587         referenced.classId = TypeRelationId;
 588         referenced.objectId = returnType;
 589         referenced.objectSubId = 0;
 590         recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
 591
 592         /* dependency on parameter types */
 593         for (i = 0; i < allParamCount; i++)
 594         {
 595                 referenced.classId = TypeRelationId;
 596                 referenced.objectId = allParams[i];
 597                 referenced.objectSubId = 0;
 598                 recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
 599         }
 600
 601         /* dependency on owner */
 602         if (!is_update)
 603                 recordDependencyOnOwner(ProcedureRelationId, retval, proowner);
 604
 605         /* dependency on any roles mentioned in ACL */
 606         if (!is_update && proacl != NULL)
 607         {
 608                 int                     nnewmembers;
 609                 Oid                *newmembers;
 610
 611                 nnewmembers = aclmembers(proacl, &newmembers);
 612                 updateAclDependencies(ProcedureRelationId, retval, 0,
 613                                                           proowner,
 614                                                           0, NULL,
 615                                                           nnewmembers, newmembers);
 616         }
 617
 618         heap_freetuple(tup);
 619
 620         /* Post creation hook for new function */
 621         InvokeObjectAccessHook(OAT_POST_CREATE, ProcedureRelationId, retval, 0);
 622
 623         heap_close(rel, RowExclusiveLock);
 624
 625         /* Verify function body */
 626         if (OidIsValid(languageValidator))
 627         {
 628                 ArrayType  *set_items;
 629                 int                     save_nestlevel;
 630
 631                 /* Advance command counter so new tuple can be seen by validator */
 632                 CommandCounterIncrement();
 633
 634                 /* Set per-function configuration parameters */
 635                 set_items = (ArrayType *) DatumGetPointer(proconfig);
 636                 if (set_items)                  /* Need a new GUC nesting level */
 637                 {
 638                         save_nestlevel = NewGUCNestLevel();
 639                         ProcessGUCArray(set_items,
 640                                                         (superuser() ? PGC_SUSET : PGC_USERSET),
 641                                                         PGC_S_SESSION,
 642                                                         GUC_ACTION_SAVE);
 643                 }
 644                 else
 645                         save_nestlevel = 0; /* keep compiler quiet */
 646
 647                 OidFunctionCall1(languageValidator, ObjectIdGetDatum(retval));
 648
 649                 if (set_items)
 650                         AtEOXact_GUC(true, save_nestlevel);
 651         }
 652
 653         return retval;
 654 }
 655
 656
 657
 658 /*
 659  * Validator for internal functions
 660  *
 661  * Check that the given internal function name (the "prosrc" value) is
 662  * a known builtin function.
 663  */
 664 Datum
 665 fmgr_internal_validator(PG_FUNCTION_ARGS)
 666 {
 667         Oid                     funcoid = PG_GETARG_OID(0);
 668         HeapTuple       tuple;
 669         Form_pg_proc proc;
 670         bool            isnull;
 671         Datum           tmp;
 672         char       *prosrc;
 673
 674         /*
 675          * We do not honor check_function_bodies since it's unlikely the function
 676          * name will be found later if it isn't there now.
 677          */
 678
 679         tuple = SearchSysCache1(PROCOID, ObjectIdGetDatum(funcoid));
 680         if (!HeapTupleIsValid(tuple))
 681                 elog(ERROR, "cache lookup failed for function %u", funcoid);
 682         proc = (Form_pg_proc) GETSTRUCT(tuple);
 683
 684         tmp = SysCacheGetAttr(PROCOID, tuple, Anum_pg_proc_prosrc, &isnull);
 685         if (isnull)
 686                 elog(ERROR, "null prosrc");
 687         prosrc = TextDatumGetCString(tmp);
 688
 689         if (fmgr_internal_function(prosrc) == InvalidOid)
 690                 ereport(ERROR,
 691                                 (errcode(ERRCODE_UNDEFINED_FUNCTION),
 692                                  errmsg("there is no built-in function named \"%s\"",
 693                                                 prosrc)));
 694
 695         ReleaseSysCache(tuple);
 696
 697         PG_RETURN_VOID();
 698 }
 699
 700
 701
 702 /*
 703  * Validator for C language functions
 704  *
 705  * Make sure that the library file exists, is loadable, and contains
 706  * the specified link symbol. Also check for a valid function
 707  * information record.
 708  */
 709 Datum
 710 fmgr_c_validator(PG_FUNCTION_ARGS)
 711 {
 712         Oid                     funcoid = PG_GETARG_OID(0);
 713         void       *libraryhandle;
 714         HeapTuple       tuple;
 715         Form_pg_proc proc;
 716         bool            isnull;
 717         Datum           tmp;
 718         char       *prosrc;
 719         char       *probin;
 720
 721         /*
 722          * It'd be most consistent to skip the check if !check_function_bodies,
 723          * but the purpose of that switch is to be helpful for pg_dump loading,
 724          * and for pg_dump loading it's much better if we *do* check.
 725          */
 726
 727         tuple = SearchSysCache1(PROCOID, ObjectIdGetDatum(funcoid));
 728         if (!HeapTupleIsValid(tuple))
 729                 elog(ERROR, "cache lookup failed for function %u", funcoid);
 730         proc = (Form_pg_proc) GETSTRUCT(tuple);
 731
 732         tmp = SysCacheGetAttr(PROCOID, tuple, Anum_pg_proc_prosrc, &isnull);
 733         if (isnull)
 734                 elog(ERROR, "null prosrc for C function %u", funcoid);
 735         prosrc = TextDatumGetCString(tmp);
 736
 737         tmp = SysCacheGetAttr(PROCOID, tuple, Anum_pg_proc_probin, &isnull);
 738         if (isnull)
 739                 elog(ERROR, "null probin for C function %u", funcoid);
 740         probin = TextDatumGetCString(tmp);
 741
 742         (void) load_external_function(probin, prosrc, true, &libraryhandle);
 743         (void) fetch_finfo_record(libraryhandle, prosrc);
 744
 745         ReleaseSysCache(tuple);
 746
 747         PG_RETURN_VOID();
 748 }
 749
 750
 751 /*
 752  * Validator for SQL language functions
 753  *
 754  * Parse it here in order to be sure that it contains no syntax errors.
 755  */
 756 Datum
 757 fmgr_sql_validator(PG_FUNCTION_ARGS)
 758 {
 759         Oid                     funcoid = PG_GETARG_OID(0);
 760         HeapTuple       tuple;
 761         Form_pg_proc proc;
 762         List       *querytree_list;
 763         bool            isnull;
 764         Datum           tmp;
 765         char       *prosrc;
 766         parse_error_callback_arg callback_arg;
 767         ErrorContextCallback sqlerrcontext;
 768         bool            haspolyarg;
 769         int                     i;
 770
 771         tuple = SearchSysCache1(PROCOID, ObjectIdGetDatum(funcoid));
 772         if (!HeapTupleIsValid(tuple))
 773                 elog(ERROR, "cache lookup failed for function %u", funcoid);
 774         proc = (Form_pg_proc) GETSTRUCT(tuple);
 775
 776         /* Disallow pseudotype result */
 777         /* except for RECORD, VOID, or polymorphic */
 778         if (get_typtype(proc->prorettype) == TYPTYPE_PSEUDO &&
 779                 proc->prorettype != RECORDOID &&
 780                 proc->prorettype != VOIDOID &&
 781                 !IsPolymorphicType(proc->prorettype))
 782                 ereport(ERROR,
 783                                 (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
 784                                  errmsg("SQL functions cannot return type %s",
 785                                                 format_type_be(proc->prorettype))));
 786
 787         /* Disallow pseudotypes in arguments */
 788         /* except for polymorphic */
 789         haspolyarg = false;
 790         for (i = 0; i < proc->pronargs; i++)
 791         {
 792                 if (get_typtype(proc->proargtypes.values[i]) == TYPTYPE_PSEUDO)
 793                 {
 794                         if (IsPolymorphicType(proc->proargtypes.values[i]))
 795                                 haspolyarg = true;
 796                         else
 797                                 ereport(ERROR,
 798                                                 (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
 799                                          errmsg("SQL functions cannot have arguments of type %s",
 800                                                         format_type_be(proc->proargtypes.values[i]))));
 801                 }
 802         }
 803
 804         /* Postpone body checks if !check_function_bodies */
 805         if (check_function_bodies)
 806         {
 807                 tmp = SysCacheGetAttr(PROCOID, tuple, Anum_pg_proc_prosrc, &isnull);
 808                 if (isnull)
 809                         elog(ERROR, "null prosrc");
 810
 811                 prosrc = TextDatumGetCString(tmp);
 812
 813                 /*
 814                  * Setup error traceback support for ereport().
 815                  */
 816                 callback_arg.proname = NameStr(proc->proname);
 817                 callback_arg.prosrc = prosrc;
 818
 819                 sqlerrcontext.callback = sql_function_parse_error_callback;
 820                 sqlerrcontext.arg = (void *) &callback_arg;
 821                 sqlerrcontext.previous = error_context_stack;
 822                 error_context_stack = &sqlerrcontext;
 823
 824                 /*
 825                  * We can't do full prechecking of the function definition if there
 826                  * are any polymorphic input types, because actual datatypes of
 827                  * expression results will be unresolvable.  The check will be done at
 828                  * runtime instead.
 829                  *
 830                  * We can run the text through the raw parser though; this will at
 831                  * least catch silly syntactic errors.
 832                  */
 833                 if (!haspolyarg)
 834                 {
 835                         querytree_list = pg_parse_and_rewrite(prosrc,
 836                                                                                                   proc->proargtypes.values,
 837                                                                                                   proc->pronargs);
 838                         (void) check_sql_fn_retval(funcoid, proc->prorettype,
 839                                                                            querytree_list,
 840                                                                            NULL, NULL);
 841                 }
 842                 else
 843                         querytree_list = pg_parse_query(prosrc);
 844
 845                 error_context_stack = sqlerrcontext.previous;
 846         }
 847
 848         ReleaseSysCache(tuple);
 849
 850         PG_RETURN_VOID();
 851 }
 852
 853 /*
 854  * Error context callback for handling errors in SQL function definitions
 855  */
 856 static void
 857 sql_function_parse_error_callback(void *arg)
 858 {
 859         parse_error_callback_arg *callback_arg = (parse_error_callback_arg *) arg;
 860
 861         /* See if it's a syntax error; if so, transpose to CREATE FUNCTION */
 862         if (!function_parse_error_transpose(callback_arg->prosrc))
 863         {
 864                 /* If it's not a syntax error, push info onto context stack */
 865                 errcontext("SQL function \"%s\"", callback_arg->proname);
 866         }
 867 }
 868
 869 /*
 870  * Adjust a syntax error occurring inside the function body of a CREATE
 871  * FUNCTION or DO command.      This can be used by any function validator or
 872  * anonymous-block handler, not only for SQL-language functions.
 873  * It is assumed that the syntax error position is initially relative to the
 874  * function body string (as passed in).  If possible, we adjust the position
 875  * to reference the original command text; if we can't manage that, we set
 876  * up an "internal query" syntax error instead.
 877  *
 878  * Returns true if a syntax error was processed, false if not.
 879  */
 880 bool
 881 function_parse_error_transpose(const char *prosrc)
 882 {
 883         int                     origerrposition;
 884         int                     newerrposition;
 885         const char *queryText;
 886
 887         /*
 888          * Nothing to do unless we are dealing with a syntax error that has a
 889          * cursor position.
 890          *
 891          * Some PLs may prefer to report the error position as an internal error
 892          * to begin with, so check that too.
 893          */
 894         origerrposition = geterrposition();
 895         if (origerrposition <= 0)
 896         {
 897                 origerrposition = getinternalerrposition();
 898                 if (origerrposition <= 0)
 899                         return false;
 900         }
 901
 902         /* We can get the original query text from the active portal (hack...) */
 903         Assert(ActivePortal && ActivePortal->status == PORTAL_ACTIVE);
 904         queryText = ActivePortal->sourceText;
 905
 906         /* Try to locate the prosrc in the original text */
 907         newerrposition = match_prosrc_to_query(prosrc, queryText, origerrposition);
 908
 909         if (newerrposition > 0)
 910         {
 911                 /* Successful, so fix error position to reference original query */
 912                 errposition(newerrposition);
 913                 /* Get rid of any report of the error as an "internal query" */
 914                 internalerrposition(0);
 915                 internalerrquery(NULL);
 916         }
 917         else
 918         {
 919                 /*
 920                  * If unsuccessful, convert the position to an internal position
 921                  * marker and give the function text as the internal query.
 922                  */
 923                 errposition(0);
 924                 internalerrposition(origerrposition);
 925                 internalerrquery(prosrc);
 926         }
 927
 928         return true;
 929 }
 930
 931 /*
 932  * Try to locate the string literal containing the function body in the
 933  * given text of the CREATE FUNCTION or DO command.  If successful, return
 934  * the character (not byte) index within the command corresponding to the
 935  * given character index within the literal.  If not successful, return 0.
 936  */
 937 static int
 938 match_prosrc_to_query(const char *prosrc, const char *queryText,
 939                                           int cursorpos)
 940 {
 941         /*
 942          * Rather than fully parsing the original command, we just scan the
 943          * command looking for $prosrc$ or 'prosrc'.  This could be fooled (though
 944          * not in any very probable scenarios), so fail if we find more than one
 945          * match.
 946          */
 947         int                     prosrclen = strlen(prosrc);
 948         int                     querylen = strlen(queryText);
 949         int                     matchpos = 0;
 950         int                     curpos;
 951         int                     newcursorpos;
 952
 953         for (curpos = 0; curpos < querylen - prosrclen; curpos++)
 954         {
 955                 if (queryText[curpos] == '$' &&
 956                         strncmp(prosrc, &queryText[curpos + 1], prosrclen) == 0 &&
 957                         queryText[curpos + 1 + prosrclen] == '$')
 958                 {
 959                         /*
 960                          * Found a $foo$ match.  Since there are no embedded quoting
 961                          * characters in a dollar-quoted literal, we don't have to do any
 962                          * fancy arithmetic; just offset by the starting position.
 963                          */
 964                         if (matchpos)
 965                                 return 0;               /* multiple matches, fail */
 966                         matchpos = pg_mbstrlen_with_len(queryText, curpos + 1)
 967                                 + cursorpos;
 968                 }
 969                 else if (queryText[curpos] == '\'' &&
 970                                  match_prosrc_to_literal(prosrc, &queryText[curpos + 1],
 971                                                                                  cursorpos, &newcursorpos))
 972                 {
 973                         /*
 974                          * Found a 'foo' match.  match_prosrc_to_literal() has adjusted
 975                          * for any quotes or backslashes embedded in the literal.
 976                          */
 977                         if (matchpos)
 978                                 return 0;               /* multiple matches, fail */
 979                         matchpos = pg_mbstrlen_with_len(queryText, curpos + 1)
 980                                 + newcursorpos;
 981                 }
 982         }
 983
 984         return matchpos;
 985 }
 986
 987 /*
 988  * Try to match the given source text to a single-quoted literal.
 989  * If successful, adjust newcursorpos to correspond to the character
 990  * (not byte) index corresponding to cursorpos in the source text.
 991  *
 992  * At entry, literal points just past a ' character.  We must check for the
 993  * trailing quote.
 994  */
 995 static bool
 996 match_prosrc_to_literal(const char *prosrc, const char *literal,
 997                                                 int cursorpos, int *newcursorpos)
 998 {
 999         int                     newcp = cursorpos;
1000         int                     chlen;
1001
1002         /*
1003          * This implementation handles backslashes and doubled quotes in the
1004          * string literal.      It does not handle the SQL syntax for literals
1005          * continued across line boundaries.
1006          *
1007          * We do the comparison a character at a time, not a byte at a time, so
1008          * that we can do the correct cursorpos math.
1009          */
1010         while (*prosrc)
1011         {
1012                 cursorpos--;                    /* characters left before cursor */
1013
1014                 /*
1015                  * Check for backslashes and doubled quotes in the literal; adjust
1016                  * newcp when one is found before the cursor.
1017                  */
1018                 if (*literal == '\\')
1019                 {
1020                         literal++;
1021                         if (cursorpos > 0)
1022                                 newcp++;
1023                 }
1024                 else if (*literal == '\'')
1025                 {
1026                         if (literal[1] != '\'')
1027                                 goto fail;
1028                         literal++;
1029                         if (cursorpos > 0)
1030                                 newcp++;
1031                 }
1032                 chlen = pg_mblen(prosrc);
1033                 if (strncmp(prosrc, literal, chlen) != 0)
1034                         goto fail;
1035                 prosrc += chlen;
1036                 literal += chlen;
1037         }
1038
1039         if (*literal == '\'' && literal[1] != '\'')
1040         {
1041                 /* success */
1042                 *newcursorpos = newcp;
1043                 return true;
1044         }
1045
1046 fail:
1047         /* Must set *newcursorpos to suppress compiler warning */
1048         *newcursorpos = newcp;
1049         return false;
1050 }