Header And Logo
|
#include "postgres.h"#include "access/htup_details.h"#include "access/xact.h"#include "catalog/dependency.h"#include "catalog/heap.h"#include "catalog/index.h"#include "catalog/objectaccess.h"#include "catalog/pg_amop.h"#include "catalog/pg_amproc.h"#include "catalog/pg_attrdef.h"#include "catalog/pg_authid.h"#include "catalog/pg_cast.h"#include "catalog/pg_collation.h"#include "catalog/pg_collation_fn.h"#include "catalog/pg_constraint.h"#include "catalog/pg_conversion.h"#include "catalog/pg_conversion_fn.h"#include "catalog/pg_database.h"#include "catalog/pg_default_acl.h"#include "catalog/pg_depend.h"#include "catalog/pg_event_trigger.h"#include "catalog/pg_extension.h"#include "catalog/pg_foreign_data_wrapper.h"#include "catalog/pg_foreign_server.h"#include "catalog/pg_language.h"#include "catalog/pg_largeobject.h"#include "catalog/pg_namespace.h"#include "catalog/pg_opclass.h"#include "catalog/pg_operator.h"#include "catalog/pg_opfamily.h"#include "catalog/pg_proc.h"#include "catalog/pg_rewrite.h"#include "catalog/pg_tablespace.h"#include "catalog/pg_trigger.h"#include "catalog/pg_ts_config.h"#include "catalog/pg_ts_dict.h"#include "catalog/pg_ts_parser.h"#include "catalog/pg_ts_template.h"#include "catalog/pg_type.h"#include "catalog/pg_user_mapping.h"#include "commands/comment.h"#include "commands/defrem.h"#include "commands/event_trigger.h"#include "commands/extension.h"#include "commands/proclang.h"#include "commands/schemacmds.h"#include "commands/seclabel.h"#include "commands/trigger.h"#include "commands/typecmds.h"#include "nodes/nodeFuncs.h"#include "parser/parsetree.h"#include "rewrite/rewriteRemove.h"#include "storage/lmgr.h"#include "utils/fmgroids.h"#include "utils/guc.h"#include "utils/lsyscache.h"#include "utils/syscache.h"#include "utils/tqual.h"Go to the source code of this file.
| #define DEPFLAG_AUTO 0x0004 |
Definition at line 90 of file dependency.c.
Referenced by reportDependentObjects().
| #define DEPFLAG_EXTENSION 0x0010 |
Definition at line 92 of file dependency.c.
Referenced by reportDependentObjects().
| #define DEPFLAG_INTERNAL 0x0008 |
Definition at line 91 of file dependency.c.
Referenced by reportDependentObjects().
| #define DEPFLAG_NORMAL 0x0002 |
Definition at line 89 of file dependency.c.
| #define DEPFLAG_ORIGINAL 0x0001 |
Definition at line 88 of file dependency.c.
Referenced by deleteWhatDependsOn(), performDeletion(), performMultipleDeletions(), and reportDependentObjects().
| #define DEPFLAG_REVERSE 0x0020 |
Definition at line 93 of file dependency.c.
Referenced by findDependentObjects().
| #define MAX_REPORTED_DEPS 100 |
Referenced by checkSharedDependencies(), and reportDependentObjects().
| typedef struct ObjectAddressStack ObjectAddressStack |
| static void AcquireDeletionLock | ( | const ObjectAddress * | object, | |
| int | flags | |||
| ) | [static] |
Definition at line 1266 of file dependency.c.
References AccessExclusiveLock, ObjectAddress::classId, LockDatabaseObject(), LockRelationOid(), ObjectAddress::objectId, PERFORM_DELETION_CONCURRENTLY, RelationRelationId, and ShareUpdateExclusiveLock.
Referenced by deleteWhatDependsOn(), findDependentObjects(), performDeletion(), and performMultipleDeletions().
{
if (object->classId == RelationRelationId)
{
/*
* In DROP INDEX CONCURRENTLY, take only ShareUpdateExclusiveLock on
* the index for the moment. index_drop() will promote the lock once
* it's safe to do so. In all other cases we need full exclusive
* lock.
*/
if (flags & PERFORM_DELETION_CONCURRENTLY)
LockRelationOid(object->objectId, ShareUpdateExclusiveLock);
else
LockRelationOid(object->objectId, AccessExclusiveLock);
}
else
{
/* assume we should lock the whole object not a sub-object */
LockDatabaseObject(object->classId, object->objectId, 0,
AccessExclusiveLock);
}
}
| void add_exact_object_address | ( | const ObjectAddress * | object, | |
| ObjectAddresses * | addrs | |||
| ) |
Definition at line 2015 of file dependency.c.
References Assert, ObjectAddresses::extras, ObjectAddresses::maxrefs, ObjectAddresses::numrefs, ObjectAddresses::refs, and repalloc().
Referenced by AlterConstraintNamespaces(), AlterIndexNamespaces(), AlterRelationNamespaceInternal(), AlterTypeNamespaceInternal(), makeConfigurationDependencies(), recordDependencyOnSingleRelExpr(), RemoveObjects(), RemoveRelations(), and shdepDropOwned().
{
ObjectAddress *item;
/* enlarge array if needed */
if (addrs->numrefs >= addrs->maxrefs)
{
addrs->maxrefs *= 2;
addrs->refs = (ObjectAddress *)
repalloc(addrs->refs, addrs->maxrefs * sizeof(ObjectAddress));
Assert(!addrs->extras);
}
/* record this item */
item = addrs->refs + addrs->numrefs;
*item = *object;
addrs->numrefs++;
}
| static void add_exact_object_address_extra | ( | const ObjectAddress * | object, | |
| const ObjectAddressExtra * | extra, | |||
| ObjectAddresses * | addrs | |||
| ) | [static] |
Definition at line 2040 of file dependency.c.
References ObjectAddresses::extras, ObjectAddresses::maxrefs, ObjectAddresses::numrefs, palloc(), ObjectAddresses::refs, and repalloc().
Referenced by findDependentObjects().
{
ObjectAddress *item;
ObjectAddressExtra *itemextra;
/* allocate extra space if first time */
if (!addrs->extras)
addrs->extras = (ObjectAddressExtra *)
palloc(addrs->maxrefs * sizeof(ObjectAddressExtra));
/* enlarge array if needed */
if (addrs->numrefs >= addrs->maxrefs)
{
addrs->maxrefs *= 2;
addrs->refs = (ObjectAddress *)
repalloc(addrs->refs, addrs->maxrefs * sizeof(ObjectAddress));
addrs->extras = (ObjectAddressExtra *)
repalloc(addrs->extras, addrs->maxrefs * sizeof(ObjectAddressExtra));
}
/* record this item */
item = addrs->refs + addrs->numrefs;
*item = *object;
itemextra = addrs->extras + addrs->numrefs;
*itemextra = *extra;
addrs->numrefs++;
}
| static void add_object_address | ( | ObjectClass | oclass, | |
| Oid | objectId, | |||
| int32 | subId, | |||
| ObjectAddresses * | addrs | |||
| ) | [static] |
Definition at line 1988 of file dependency.c.
References Assert, ObjectAddress::classId, ObjectAddresses::extras, ObjectAddresses::maxrefs, ObjectAddresses::numrefs, object_classes, ObjectAddress::objectId, ObjectAddress::objectSubId, ObjectAddresses::refs, and repalloc().
Referenced by find_expr_references_walker().
{
ObjectAddress *item;
/* enlarge array if needed */
if (addrs->numrefs >= addrs->maxrefs)
{
addrs->maxrefs *= 2;
addrs->refs = (ObjectAddress *)
repalloc(addrs->refs, addrs->maxrefs * sizeof(ObjectAddress));
Assert(!addrs->extras);
}
/* record this item */
item = addrs->refs + addrs->numrefs;
item->classId = object_classes[oclass];
item->objectId = objectId;
item->objectSubId = subId;
addrs->numrefs++;
}
| static void deleteObjectsInList | ( | ObjectAddresses * | targetObjects, | |
| Relation * | depRel, | |||
| int | flags | |||
| ) | [static] |
Definition at line 198 of file dependency.c.
References deleteOneObject(), EventTriggerSQLDropAddObject(), EventTriggerSupportsObjectClass(), getObjectClass(), i, ObjectAddresses::numrefs, PERFORM_DELETION_INTERNAL, ObjectAddresses::refs, and trackDroppedObjectsNeeded().
Referenced by performDeletion(), and performMultipleDeletions().
{
int i;
/*
* Keep track of objects for event triggers, if necessary.
*/
if (trackDroppedObjectsNeeded())
{
for (i = 0; i < targetObjects->numrefs; i++)
{
ObjectAddress *thisobj = targetObjects->refs + i;
if ((!(flags & PERFORM_DELETION_INTERNAL)) &&
EventTriggerSupportsObjectClass(getObjectClass(thisobj)))
{
EventTriggerSQLDropAddObject(thisobj);
}
}
}
/*
* Delete all the objects in the proper order.
*/
for (i = 0; i < targetObjects->numrefs; i++)
{
ObjectAddress *thisobj = targetObjects->refs + i;
deleteOneObject(thisobj, depRel, flags);
}
}
| static void deleteOneObject | ( | const ObjectAddress * | object, | |
| Relation * | depRel, | |||
| int | flags | |||
| ) | [static] |
Definition at line 1009 of file dependency.c.
References Anum_pg_depend_classid, Anum_pg_depend_objid, Anum_pg_depend_objsubid, BTEqualStrategyNumber, ObjectAddress::classId, CommandCounterIncrement(), DeleteComments(), DeleteSecurityLabel(), deleteSharedDependencyRecordsFor(), DependDependerIndexId, DependRelationId, doDeletion(), heap_close, heap_open(), HeapTupleIsValid, Int32GetDatum, InvokeObjectDropHookArg, ObjectAddress::objectId, ObjectIdGetDatum, ObjectAddress::objectSubId, PERFORM_DELETION_CONCURRENTLY, RowExclusiveLock, ScanKeyInit(), simple_heap_delete(), SnapshotNow, systable_beginscan(), systable_endscan(), systable_getnext(), and HeapTupleData::t_self.
{
ScanKeyData key[3];
int nkeys;
SysScanDesc scan;
HeapTuple tup;
/* DROP hook of the objects being removed */
InvokeObjectDropHookArg(object->classId, object->objectId,
object->objectSubId, flags);
/*
* Close depRel if we are doing a drop concurrently. The object deletion
* subroutine will commit the current transaction, so we can't keep the
* relation open across doDeletion().
*/
if (flags & PERFORM_DELETION_CONCURRENTLY)
heap_close(*depRel, RowExclusiveLock);
/*
* Delete the object itself, in an object-type-dependent way.
*
* We used to do this after removing the outgoing dependency links, but it
* seems just as reasonable to do it beforehand. In the concurrent case
* we *must* do it in this order, because we can't make any transactional
* updates before calling doDeletion() --- they'd get committed right
* away, which is not cool if the deletion then fails.
*/
doDeletion(object, flags);
/*
* Reopen depRel if we closed it above
*/
if (flags & PERFORM_DELETION_CONCURRENTLY)
*depRel = heap_open(DependRelationId, RowExclusiveLock);
/*
* Now remove any pg_depend records that link from this object to others.
* (Any records linking to this object should be gone already.)
*
* When dropping a whole object (subId = 0), remove all pg_depend records
* for its sub-objects too.
*/
ScanKeyInit(&key[0],
Anum_pg_depend_classid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(object->classId));
ScanKeyInit(&key[1],
Anum_pg_depend_objid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(object->objectId));
if (object->objectSubId != 0)
{
ScanKeyInit(&key[2],
Anum_pg_depend_objsubid,
BTEqualStrategyNumber, F_INT4EQ,
Int32GetDatum(object->objectSubId));
nkeys = 3;
}
else
nkeys = 2;
scan = systable_beginscan(*depRel, DependDependerIndexId, true,
SnapshotNow, nkeys, key);
while (HeapTupleIsValid(tup = systable_getnext(scan)))
{
simple_heap_delete(*depRel, &tup->t_self);
}
systable_endscan(scan);
/*
* Delete shared dependency references related to this object. Again, if
* subId = 0, remove records for sub-objects too.
*/
deleteSharedDependencyRecordsFor(object->classId, object->objectId,
object->objectSubId);
/*
* Delete any comments or security labels associated with this object.
* (This is a convenient place to do these things, rather than having
* every object type know to do it.)
*/
DeleteComments(object->objectId, object->classId, object->objectSubId);
DeleteSecurityLabel(object);
/*
* CommandCounterIncrement here to ensure that preceding changes are all
* visible to the next deletion step.
*/
CommandCounterIncrement();
/*
* And we're done!
*/
}
| static void deleteOneObject | ( | const ObjectAddress * | object, | |
| Relation * | depRel, | |||
| int32 | flags | |||
| ) | [static] |
Referenced by deleteObjectsInList(), and deleteWhatDependsOn().
| void deleteWhatDependsOn | ( | const ObjectAddress * | object, | |
| bool | showNotices | |||
| ) |
Definition at line 388 of file dependency.c.
References AcquireDeletionLock(), DEBUG2, deleteOneObject(), DependRelationId, DEPFLAG_ORIGINAL, DROP_CASCADE, ObjectAddresses::extras, findDependentObjects(), ObjectAddressExtra::flags, free_object_addresses(), heap_close, heap_open(), i, new_object_addresses(), NOTICE, NULL, ObjectAddresses::numrefs, PERFORM_DELETION_INTERNAL, ObjectAddresses::refs, reportDependentObjects(), and RowExclusiveLock.
Referenced by RemoveTempRelations().
{
Relation depRel;
ObjectAddresses *targetObjects;
int i;
/*
* We save some cycles by opening pg_depend just once and passing the
* Relation pointer down to all the recursive deletion steps.
*/
depRel = heap_open(DependRelationId, RowExclusiveLock);
/*
* Acquire deletion lock on the target object. (Ideally the caller has
* done this already, but many places are sloppy about it.)
*/
AcquireDeletionLock(object, 0);
/*
* Construct a list of objects to delete (ie, the given object plus
* everything directly or indirectly dependent on it).
*/
targetObjects = new_object_addresses();
findDependentObjects(object,
DEPFLAG_ORIGINAL,
NULL, /* empty stack */
targetObjects,
NULL, /* no pendingObjects */
&depRel);
/*
* Check if deletion is allowed, and report about cascaded deletes.
*/
reportDependentObjects(targetObjects,
DROP_CASCADE,
showNotices ? NOTICE : DEBUG2,
object);
/*
* Delete all the objects in the proper order, except we skip the original
* object.
*/
for (i = 0; i < targetObjects->numrefs; i++)
{
ObjectAddress *thisobj = targetObjects->refs + i;
ObjectAddressExtra *thisextra = targetObjects->extras + i;
if (thisextra->flags & DEPFLAG_ORIGINAL)
continue;
/*
* Since this function is currently only used to clean out temporary
* schemas, we pass PERFORM_DELETION_INTERNAL here, indicating that
* the operation is an automatic system operation rather than a user
* action. If, in the future, this function is used for other
* purposes, we might need to revisit this.
*/
deleteOneObject(thisobj, &depRel, PERFORM_DELETION_INTERNAL);
}
/* And clean up */
free_object_addresses(targetObjects);
heap_close(depRel, RowExclusiveLock);
}
| static void doDeletion | ( | const ObjectAddress * | object, | |
| int | flags | |||
| ) | [static] |
Definition at line 1112 of file dependency.c.
References Assert, ObjectAddress::classId, DropCastById(), DropProceduralLanguageById(), elog, ERROR, get_rel_relkind(), getObjectClass(), heap_drop_with_catalog(), index_drop(), LargeObjectDrop(), ObjectAddress::objectId, ObjectAddress::objectSubId, OCLASS_AMOP, OCLASS_AMPROC, OCLASS_CAST, OCLASS_CLASS, OCLASS_COLLATION, OCLASS_CONSTRAINT, OCLASS_CONVERSION, OCLASS_DEFACL, OCLASS_DEFAULT, OCLASS_EVENT_TRIGGER, OCLASS_EXTENSION, OCLASS_FDW, OCLASS_FOREIGN_SERVER, OCLASS_LANGUAGE, OCLASS_LARGEOBJECT, OCLASS_OPCLASS, OCLASS_OPERATOR, OCLASS_OPFAMILY, OCLASS_PROC, OCLASS_REWRITE, OCLASS_SCHEMA, OCLASS_TRIGGER, OCLASS_TSCONFIG, OCLASS_TSDICT, OCLASS_TSPARSER, OCLASS_TSTEMPLATE, OCLASS_TYPE, OCLASS_USER_MAPPING, PERFORM_DELETION_CONCURRENTLY, RELKIND_INDEX, RemoveAmOpEntryById(), RemoveAmProcEntryById(), RemoveAttrDefaultById(), RemoveAttributeById(), RemoveCollationById(), RemoveConstraintById(), RemoveConversionById(), RemoveDefaultACLById(), RemoveEventTriggerById(), RemoveExtensionById(), RemoveForeignDataWrapperById(), RemoveForeignServerById(), RemoveFunctionById(), RemoveOpClassById(), RemoveOperatorById(), RemoveOpFamilyById(), RemoveRewriteRuleById(), RemoveSchemaById(), RemoveTriggerById(), RemoveTSConfigurationById(), RemoveTSDictionaryById(), RemoveTSParserById(), RemoveTSTemplateById(), RemoveTypeById(), and RemoveUserMappingById().
Referenced by deleteOneObject().
{
switch (getObjectClass(object))
{
case OCLASS_CLASS:
{
char relKind = get_rel_relkind(object->objectId);
if (relKind == RELKIND_INDEX)
{
bool concurrent = ((flags & PERFORM_DELETION_CONCURRENTLY)
== PERFORM_DELETION_CONCURRENTLY);
Assert(object->objectSubId == 0);
index_drop(object->objectId, concurrent);
}
else
{
if (object->objectSubId != 0)
RemoveAttributeById(object->objectId,
object->objectSubId);
else
heap_drop_with_catalog(object->objectId);
}
break;
}
case OCLASS_PROC:
RemoveFunctionById(object->objectId);
break;
case OCLASS_TYPE:
RemoveTypeById(object->objectId);
break;
case OCLASS_CAST:
DropCastById(object->objectId);
break;
case OCLASS_COLLATION:
RemoveCollationById(object->objectId);
break;
case OCLASS_CONSTRAINT:
RemoveConstraintById(object->objectId);
break;
case OCLASS_CONVERSION:
RemoveConversionById(object->objectId);
break;
case OCLASS_DEFAULT:
RemoveAttrDefaultById(object->objectId);
break;
case OCLASS_LANGUAGE:
DropProceduralLanguageById(object->objectId);
break;
case OCLASS_LARGEOBJECT:
LargeObjectDrop(object->objectId);
break;
case OCLASS_OPERATOR:
RemoveOperatorById(object->objectId);
break;
case OCLASS_OPCLASS:
RemoveOpClassById(object->objectId);
break;
case OCLASS_OPFAMILY:
RemoveOpFamilyById(object->objectId);
break;
case OCLASS_AMOP:
RemoveAmOpEntryById(object->objectId);
break;
case OCLASS_AMPROC:
RemoveAmProcEntryById(object->objectId);
break;
case OCLASS_REWRITE:
RemoveRewriteRuleById(object->objectId);
break;
case OCLASS_TRIGGER:
RemoveTriggerById(object->objectId);
break;
case OCLASS_SCHEMA:
RemoveSchemaById(object->objectId);
break;
case OCLASS_TSPARSER:
RemoveTSParserById(object->objectId);
break;
case OCLASS_TSDICT:
RemoveTSDictionaryById(object->objectId);
break;
case OCLASS_TSTEMPLATE:
RemoveTSTemplateById(object->objectId);
break;
case OCLASS_TSCONFIG:
RemoveTSConfigurationById(object->objectId);
break;
/*
* OCLASS_ROLE, OCLASS_DATABASE, OCLASS_TBLSPACE intentionally not
* handled here
*/
case OCLASS_FDW:
RemoveForeignDataWrapperById(object->objectId);
break;
case OCLASS_FOREIGN_SERVER:
RemoveForeignServerById(object->objectId);
break;
case OCLASS_USER_MAPPING:
RemoveUserMappingById(object->objectId);
break;
case OCLASS_DEFACL:
RemoveDefaultACLById(object->objectId);
break;
case OCLASS_EXTENSION:
RemoveExtensionById(object->objectId);
break;
case OCLASS_EVENT_TRIGGER:
RemoveEventTriggerById(object->objectId);
break;
default:
elog(ERROR, "unrecognized object class: %u",
object->classId);
}
}
| static void eliminate_duplicate_dependencies | ( | ObjectAddresses * | addrs | ) | [static] |
Definition at line 1875 of file dependency.c.
References Assert, ObjectAddress::classId, ObjectAddresses::extras, ObjectAddresses::numrefs, object_address_comparator(), ObjectAddress::objectId, ObjectAddress::objectSubId, qsort, and ObjectAddresses::refs.
Referenced by record_object_address_dependencies(), recordDependencyOnExpr(), and recordDependencyOnSingleRelExpr().
{
ObjectAddress *priorobj;
int oldref,
newrefs;
/*
* We can't sort if the array has "extra" data, because there's no way to
* keep it in sync. Fortunately that combination of features is not
* needed.
*/
Assert(!addrs->extras);
if (addrs->numrefs <= 1)
return; /* nothing to do */
/* Sort the refs so that duplicates are adjacent */
qsort((void *) addrs->refs, addrs->numrefs, sizeof(ObjectAddress),
object_address_comparator);
/* Remove dups */
priorobj = addrs->refs;
newrefs = 1;
for (oldref = 1; oldref < addrs->numrefs; oldref++)
{
ObjectAddress *thisobj = addrs->refs + oldref;
if (priorobj->classId == thisobj->classId &&
priorobj->objectId == thisobj->objectId)
{
if (priorobj->objectSubId == thisobj->objectSubId)
continue; /* identical, so drop thisobj */
/*
* If we have a whole-object reference and a reference to a part
* of the same object, we don't need the whole-object reference
* (for example, we don't need to reference both table foo and
* column foo.bar). The whole-object reference will always appear
* first in the sorted list.
*/
if (priorobj->objectSubId == 0)
{
/* replace whole ref with partial */
priorobj->objectSubId = thisobj->objectSubId;
continue;
}
}
/* Not identical, so add thisobj to output set */
priorobj++;
*priorobj = *thisobj;
newrefs++;
}
addrs->numrefs = newrefs;
}
| static bool find_expr_references_walker | ( | Node * | node, | |
| find_expr_references_context * | context | |||
| ) | [static] |
Definition at line 1452 of file dependency.c.
References add_object_address(), find_expr_references_context::addrs, Aggref::aggfnoid, CMD_INSERT, CMD_UPDATE, CollateExpr::collOid, Query::commandType, Const::constcollid, Const::constisnull, Query::constraintDeps, Const::consttype, Const::constvalue, DatumGetObjectId, DEFAULT_COLLATION_OID, Query::distinctClause, ArrayCoerceExpr::elemfuncid, elog, SortGroupClause::eqop, ERROR, expression_tree_walker(), RangeTblEntry::funccolcollations, RangeTblEntry::funccoltypes, FuncExpr::funcid, Query::groupClause, SetOperationStmt::groupClauses, InvalidAttrNumber, IsA, RangeTblEntry::joinaliasvars, lcons(), lfirst, lfirst_oid, list_copy_tail(), list_delete_first(), list_free(), list_length(), list_nth(), NULL, ObjectIdGetDatum, OCLASS_CLASS, OCLASS_COLLATION, OCLASS_CONSTRAINT, OCLASS_OPERATOR, OCLASS_OPFAMILY, OCLASS_PROC, OCLASS_TSCONFIG, OCLASS_TSDICT, OCLASS_TYPE, OidIsValid, OPEROID, RowCompareExpr::opfamilies, ScalarArrayOpExpr::opno, OpExpr::opno, RowCompareExpr::opnos, Param::paramcollid, Param::paramtype, PROCOID, QTW_IGNORE_JOINALIASES, query_tree_walker(), REGCLASSOID, REGCONFIGOID, REGDICTIONARYOID, REGOPERATOROID, REGOPEROID, REGPROCEDUREOID, REGPROCOID, REGTYPEOID, RangeTblEntry::relid, RELOID, TargetEntry::resjunk, TargetEntry::resno, RelabelType::resultcollid, Query::resultRelation, CoerceToDomain::resulttype, ConvertRowtypeExpr::resulttype, ArrayCoerceExpr::resulttype, CoerceViaIO::resulttype, RelabelType::resulttype, RowExpr::row_typeid, rt_fetch, Query::rtable, find_expr_references_context::rtables, RTE_FUNCTION, RTE_JOIN, RTE_RELATION, RangeTblEntry::rtekind, SearchSysCacheExists1, Query::sortClause, SortGroupClause::sortop, Query::targetList, TSCONFIGOID, TSDICTOID, TYPEOID, Var::varattno, Var::varlevelsup, Var::varno, Query::windowClause, and WindowFunc::winfnoid.
Referenced by recordDependencyOnExpr(), and recordDependencyOnSingleRelExpr().
{
if (node == NULL)
return false;
if (IsA(node, Var))
{
Var *var = (Var *) node;
List *rtable;
RangeTblEntry *rte;
/* Find matching rtable entry, or complain if not found */
if (var->varlevelsup >= list_length(context->rtables))
elog(ERROR, "invalid varlevelsup %d", var->varlevelsup);
rtable = (List *) list_nth(context->rtables, var->varlevelsup);
if (var->varno <= 0 || var->varno > list_length(rtable))
elog(ERROR, "invalid varno %d", var->varno);
rte = rt_fetch(var->varno, rtable);
/*
* A whole-row Var references no specific columns, so adds no new
* dependency. (We assume that there is a whole-table dependency
* arising from each underlying rangetable entry. While we could
* record such a dependency when finding a whole-row Var that
* references a relation directly, it's quite unclear how to extend
* that to whole-row Vars for JOINs, so it seems better to leave the
* responsibility with the range table. Note that this poses some
* risks for identifying dependencies of stand-alone expressions:
* whole-table references may need to be created separately.)
*/
if (var->varattno == InvalidAttrNumber)
return false;
if (rte->rtekind == RTE_RELATION)
{
/* If it's a plain relation, reference this column */
add_object_address(OCLASS_CLASS, rte->relid, var->varattno,
context->addrs);
}
else if (rte->rtekind == RTE_JOIN)
{
/* Scan join output column to add references to join inputs */
List *save_rtables;
/* We must make the context appropriate for join's level */
save_rtables = context->rtables;
context->rtables = list_copy_tail(context->rtables,
var->varlevelsup);
if (var->varattno <= 0 ||
var->varattno > list_length(rte->joinaliasvars))
elog(ERROR, "invalid varattno %d", var->varattno);
find_expr_references_walker((Node *) list_nth(rte->joinaliasvars,
var->varattno - 1),
context);
list_free(context->rtables);
context->rtables = save_rtables;
}
return false;
}
else if (IsA(node, Const))
{
Const *con = (Const *) node;
Oid objoid;
/* A constant must depend on the constant's datatype */
add_object_address(OCLASS_TYPE, con->consttype, 0,
context->addrs);
/*
* We must also depend on the constant's collation: it could be
* different from the datatype's, if a CollateExpr was const-folded to
* a simple constant. However we can save work in the most common
* case where the collation is "default", since we know that's pinned.
*/
if (OidIsValid(con->constcollid) &&
con->constcollid != DEFAULT_COLLATION_OID)
add_object_address(OCLASS_COLLATION, con->constcollid, 0,
context->addrs);
/*
* If it's a regclass or similar literal referring to an existing
* object, add a reference to that object. (Currently, only the
* regclass and regconfig cases have any likely use, but we may as
* well handle all the OID-alias datatypes consistently.)
*/
if (!con->constisnull)
{
switch (con->consttype)
{
case REGPROCOID:
case REGPROCEDUREOID:
objoid = DatumGetObjectId(con->constvalue);
if (SearchSysCacheExists1(PROCOID,
ObjectIdGetDatum(objoid)))
add_object_address(OCLASS_PROC, objoid, 0,
context->addrs);
break;
case REGOPEROID:
case REGOPERATOROID:
objoid = DatumGetObjectId(con->constvalue);
if (SearchSysCacheExists1(OPEROID,
ObjectIdGetDatum(objoid)))
add_object_address(OCLASS_OPERATOR, objoid, 0,
context->addrs);
break;
case REGCLASSOID:
objoid = DatumGetObjectId(con->constvalue);
if (SearchSysCacheExists1(RELOID,
ObjectIdGetDatum(objoid)))
add_object_address(OCLASS_CLASS, objoid, 0,
context->addrs);
break;
case REGTYPEOID:
objoid = DatumGetObjectId(con->constvalue);
if (SearchSysCacheExists1(TYPEOID,
ObjectIdGetDatum(objoid)))
add_object_address(OCLASS_TYPE, objoid, 0,
context->addrs);
break;
case REGCONFIGOID:
objoid = DatumGetObjectId(con->constvalue);
if (SearchSysCacheExists1(TSCONFIGOID,
ObjectIdGetDatum(objoid)))
add_object_address(OCLASS_TSCONFIG, objoid, 0,
context->addrs);
break;
case REGDICTIONARYOID:
objoid = DatumGetObjectId(con->constvalue);
if (SearchSysCacheExists1(TSDICTOID,
ObjectIdGetDatum(objoid)))
add_object_address(OCLASS_TSDICT, objoid, 0,
context->addrs);
break;
}
}
return false;
}
else if (IsA(node, Param))
{
Param *param = (Param *) node;
/* A parameter must depend on the parameter's datatype */
add_object_address(OCLASS_TYPE, param->paramtype, 0,
context->addrs);
/* and its collation, just as for Consts */
if (OidIsValid(param->paramcollid) &&
param->paramcollid != DEFAULT_COLLATION_OID)
add_object_address(OCLASS_COLLATION, param->paramcollid, 0,
context->addrs);
}
else if (IsA(node, FuncExpr))
{
FuncExpr *funcexpr = (FuncExpr *) node;
add_object_address(OCLASS_PROC, funcexpr->funcid, 0,
context->addrs);
/* fall through to examine arguments */
}
else if (IsA(node, OpExpr))
{
OpExpr *opexpr = (OpExpr *) node;
add_object_address(OCLASS_OPERATOR, opexpr->opno, 0,
context->addrs);
/* fall through to examine arguments */
}
else if (IsA(node, DistinctExpr))
{
DistinctExpr *distinctexpr = (DistinctExpr *) node;
add_object_address(OCLASS_OPERATOR, distinctexpr->opno, 0,
context->addrs);
/* fall through to examine arguments */
}
else if (IsA(node, NullIfExpr))
{
NullIfExpr *nullifexpr = (NullIfExpr *) node;
add_object_address(OCLASS_OPERATOR, nullifexpr->opno, 0,
context->addrs);
/* fall through to examine arguments */
}
else if (IsA(node, ScalarArrayOpExpr))
{
ScalarArrayOpExpr *opexpr = (ScalarArrayOpExpr *) node;
add_object_address(OCLASS_OPERATOR, opexpr->opno, 0,
context->addrs);
/* fall through to examine arguments */
}
else if (IsA(node, Aggref))
{
Aggref *aggref = (Aggref *) node;
add_object_address(OCLASS_PROC, aggref->aggfnoid, 0,
context->addrs);
/* fall through to examine arguments */
}
else if (IsA(node, WindowFunc))
{
WindowFunc *wfunc = (WindowFunc *) node;
add_object_address(OCLASS_PROC, wfunc->winfnoid, 0,
context->addrs);
/* fall through to examine arguments */
}
else if (IsA(node, SubPlan))
{
/* Extra work needed here if we ever need this case */
elog(ERROR, "already-planned subqueries not supported");
}
else if (IsA(node, RelabelType))
{
RelabelType *relab = (RelabelType *) node;
/* since there is no function dependency, need to depend on type */
add_object_address(OCLASS_TYPE, relab->resulttype, 0,
context->addrs);
/* the collation might not be referenced anywhere else, either */
if (OidIsValid(relab->resultcollid) &&
relab->resultcollid != DEFAULT_COLLATION_OID)
add_object_address(OCLASS_COLLATION, relab->resultcollid, 0,
context->addrs);
}
else if (IsA(node, CoerceViaIO))
{
CoerceViaIO *iocoerce = (CoerceViaIO *) node;
/* since there is no exposed function, need to depend on type */
add_object_address(OCLASS_TYPE, iocoerce->resulttype, 0,
context->addrs);
}
else if (IsA(node, ArrayCoerceExpr))
{
ArrayCoerceExpr *acoerce = (ArrayCoerceExpr *) node;
if (OidIsValid(acoerce->elemfuncid))
add_object_address(OCLASS_PROC, acoerce->elemfuncid, 0,
context->addrs);
add_object_address(OCLASS_TYPE, acoerce->resulttype, 0,
context->addrs);
/* fall through to examine arguments */
}
else if (IsA(node, ConvertRowtypeExpr))
{
ConvertRowtypeExpr *cvt = (ConvertRowtypeExpr *) node;
/* since there is no function dependency, need to depend on type */
add_object_address(OCLASS_TYPE, cvt->resulttype, 0,
context->addrs);
}
else if (IsA(node, CollateExpr))
{
CollateExpr *coll = (CollateExpr *) node;
add_object_address(OCLASS_COLLATION, coll->collOid, 0,
context->addrs);
}
else if (IsA(node, RowExpr))
{
RowExpr *rowexpr = (RowExpr *) node;
add_object_address(OCLASS_TYPE, rowexpr->row_typeid, 0,
context->addrs);
}
else if (IsA(node, RowCompareExpr))
{
RowCompareExpr *rcexpr = (RowCompareExpr *) node;
ListCell *l;
foreach(l, rcexpr->opnos)
{
add_object_address(OCLASS_OPERATOR, lfirst_oid(l), 0,
context->addrs);
}
foreach(l, rcexpr->opfamilies)
{
add_object_address(OCLASS_OPFAMILY, lfirst_oid(l), 0,
context->addrs);
}
/* fall through to examine arguments */
}
else if (IsA(node, CoerceToDomain))
{
CoerceToDomain *cd = (CoerceToDomain *) node;
add_object_address(OCLASS_TYPE, cd->resulttype, 0,
context->addrs);
}
else if (IsA(node, SortGroupClause))
{
SortGroupClause *sgc = (SortGroupClause *) node;
add_object_address(OCLASS_OPERATOR, sgc->eqop, 0,
context->addrs);
if (OidIsValid(sgc->sortop))
add_object_address(OCLASS_OPERATOR, sgc->sortop, 0,
context->addrs);
return false;
}
else if (IsA(node, Query))
{
/* Recurse into RTE subquery or not-yet-planned sublink subquery */
Query *query = (Query *) node;
ListCell *lc;
bool result;
/*
* Add whole-relation refs for each plain relation mentioned in the
* subquery's rtable, as well as refs for any datatypes and collations
* used in a RECORD function's output.
*
* Note: query_tree_walker takes care of recursing into RTE_FUNCTION
* RTEs, subqueries, etc, so no need to do that here. But keep it
* from looking at join alias lists.
*
* Note: we don't need to worry about collations mentioned in
* RTE_VALUES or RTE_CTE RTEs, because those must just duplicate
* collations referenced in other parts of the Query.
*/
foreach(lc, query->rtable)
{
RangeTblEntry *rte = (RangeTblEntry *) lfirst(lc);
ListCell *ct;
switch (rte->rtekind)
{
case RTE_RELATION:
add_object_address(OCLASS_CLASS, rte->relid, 0,
context->addrs);
break;
case RTE_FUNCTION:
foreach(ct, rte->funccoltypes)
{
add_object_address(OCLASS_TYPE, lfirst_oid(ct), 0,
context->addrs);
}
foreach(ct, rte->funccolcollations)
{
Oid collid = lfirst_oid(ct);
if (OidIsValid(collid) &&
collid != DEFAULT_COLLATION_OID)
add_object_address(OCLASS_COLLATION, collid, 0,
context->addrs);
}
break;
default:
break;
}
}
/*
* If the query is an INSERT or UPDATE, we should create a dependency
* on each target column, to prevent the specific target column from
* being dropped. Although we will visit the TargetEntry nodes again
* during query_tree_walker, we won't have enough context to do this
* conveniently, so do it here.
*/
if (query->commandType == CMD_INSERT ||
query->commandType == CMD_UPDATE)
{
RangeTblEntry *rte;
if (query->resultRelation <= 0 ||
query->resultRelation > list_length(query->rtable))
elog(ERROR, "invalid resultRelation %d",
query->resultRelation);
rte = rt_fetch(query->resultRelation, query->rtable);
if (rte->rtekind == RTE_RELATION)
{
foreach(lc, query->targetList)
{
TargetEntry *tle = (TargetEntry *) lfirst(lc);
if (tle->resjunk)
continue; /* ignore junk tlist items */
add_object_address(OCLASS_CLASS, rte->relid, tle->resno,
context->addrs);
}
}
}
/*
* Add dependencies on constraints listed in query's constraintDeps
*/
foreach(lc, query->constraintDeps)
{
add_object_address(OCLASS_CONSTRAINT, lfirst_oid(lc), 0,
context->addrs);
}
/* query_tree_walker ignores ORDER BY etc, but we need those opers */
find_expr_references_walker((Node *) query->sortClause, context);
find_expr_references_walker((Node *) query->groupClause, context);
find_expr_references_walker((Node *) query->windowClause, context);
find_expr_references_walker((Node *) query->distinctClause, context);
/* Examine substructure of query */
context->rtables = lcons(query->rtable, context->rtables);
result = query_tree_walker(query,
find_expr_references_walker,
(void *) context,
QTW_IGNORE_JOINALIASES);
context->rtables = list_delete_first(context->rtables);
return result;
}
else if (IsA(node, SetOperationStmt))
{
SetOperationStmt *setop = (SetOperationStmt *) node;
/* we need to look at the groupClauses for operator references */
find_expr_references_walker((Node *) setop->groupClauses, context);
/* fall through to examine child nodes */
}
return expression_tree_walker(node, find_expr_references_walker,
(void *) context);
}
| static void findDependentObjects | ( | const ObjectAddress * | object, | |
| int | flags, | |||
| ObjectAddressStack * | stack, | |||
| ObjectAddresses * | targetObjects, | |||
| const ObjectAddresses * | pendingObjects, | |||
| Relation * | depRel | |||
| ) | [static] |
Definition at line 485 of file dependency.c.
References AcquireDeletionLock(), add_exact_object_address_extra(), Anum_pg_depend_classid, Anum_pg_depend_objid, Anum_pg_depend_objsubid, Anum_pg_depend_refclassid, Anum_pg_depend_refobjid, Anum_pg_depend_refobjsubid, BTEqualStrategyNumber, ObjectAddress::classId, creating_extension, CurrentExtensionObject, DependDependerIndexId, ObjectAddressExtra::dependee, DEPENDENCY_AUTO, DEPENDENCY_EXTENSION, DEPENDENCY_INTERNAL, DEPENDENCY_NORMAL, DEPENDENCY_PIN, DependReferenceIndexId, DEPFLAG_REVERSE, elog, ereport, errcode(), errhint(), errmsg(), ERROR, ExtensionRelationId, ObjectAddressExtra::flags, ObjectAddressStack::flags, getObjectDescription(), GETSTRUCT, HeapTupleIsValid, Int32GetDatum, ObjectAddressStack::next, NULL, ObjectAddressStack::object, object_address_present(), object_address_present_add_flags(), ObjectAddress::objectId, ObjectIdGetDatum, ObjectAddress::objectSubId, ReleaseDeletionLock(), ScanKeyInit(), SnapshotNow, stack_address_present_add_flags(), systable_beginscan(), systable_endscan(), systable_getnext(), and systable_recheck_tuple().
Referenced by deleteWhatDependsOn(), performDeletion(), and performMultipleDeletions().
{
ScanKeyData key[3];
int nkeys;
SysScanDesc scan;
HeapTuple tup;
ObjectAddress otherObject;
ObjectAddressStack mystack;
ObjectAddressExtra extra;
/*
* If the target object is already being visited in an outer recursion
* level, just report the current flags back to that level and exit. This
* is needed to avoid infinite recursion in the face of circular
* dependencies.
*
* The stack check alone would result in dependency loops being broken at
* an arbitrary point, ie, the first member object of the loop to be
* visited is the last one to be deleted. This is obviously unworkable.
* However, the check for internal dependency below guarantees that we
* will not break a loop at an internal dependency: if we enter the loop
* at an "owned" object we will switch and start at the "owning" object
* instead. We could probably hack something up to avoid breaking at an
* auto dependency, too, if we had to. However there are no known cases
* where that would be necessary.
*/
if (stack_address_present_add_flags(object, flags, stack))
return;
/*
* It's also possible that the target object has already been completely
* processed and put into targetObjects. If so, again we just add the
* specified flags to its entry and return.
*
* (Note: in these early-exit cases we could release the caller-taken
* lock, since the object is presumably now locked multiple times; but it
* seems not worth the cycles.)
*/
if (object_address_present_add_flags(object, flags, targetObjects))
return;
/*
* The target object might be internally dependent on some other object
* (its "owner"), and/or be a member of an extension (also considered its
* owner). If so, and if we aren't recursing from the owning object, we
* have to transform this deletion request into a deletion request of the
* owning object. (We'll eventually recurse back to this object, but the
* owning object has to be visited first so it will be deleted after.) The
* way to find out about this is to scan the pg_depend entries that show
* what this object depends on.
*/
ScanKeyInit(&key[0],
Anum_pg_depend_classid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(object->classId));
ScanKeyInit(&key[1],
Anum_pg_depend_objid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(object->objectId));
if (object->objectSubId != 0)
{
ScanKeyInit(&key[2],
Anum_pg_depend_objsubid,
BTEqualStrategyNumber, F_INT4EQ,
Int32GetDatum(object->objectSubId));
nkeys = 3;
}
else
nkeys = 2;
scan = systable_beginscan(*depRel, DependDependerIndexId, true,
SnapshotNow, nkeys, key);
while (HeapTupleIsValid(tup = systable_getnext(scan)))
{
Form_pg_depend foundDep = (Form_pg_depend) GETSTRUCT(tup);
otherObject.classId = foundDep->refclassid;
otherObject.objectId = foundDep->refobjid;
otherObject.objectSubId = foundDep->refobjsubid;
switch (foundDep->deptype)
{
case DEPENDENCY_NORMAL:
case DEPENDENCY_AUTO:
/* no problem */
break;
case DEPENDENCY_INTERNAL:
case DEPENDENCY_EXTENSION:
/*
* This object is part of the internal implementation of
* another object, or is part of the extension that is the
* other object. We have three cases:
*
* 1. At the outermost recursion level, we normally disallow
* the DROP. (We just ereport here, rather than proceeding,
* since no other dependencies are likely to be interesting.)
* However, there are exceptions.
*/
if (stack == NULL)
{
char *otherObjDesc;
/*
* Exception 1a: if the owning object is listed in
* pendingObjects, just release the caller's lock and
* return. We'll eventually complete the DROP when we
* reach that entry in the pending list.
*/
if (pendingObjects &&
object_address_present(&otherObject, pendingObjects))
{
systable_endscan(scan);
/* need to release caller's lock; see notes below */
ReleaseDeletionLock(object);
return;
}
/*
* Exception 1b: if the owning object is the extension
* currently being created/altered, it's okay to continue
* with the deletion. This allows dropping of an
* extension's objects within the extension's scripts, as
* well as corner cases such as dropping a transient
* object created within such a script.
*/
if (creating_extension &&
otherObject.classId == ExtensionRelationId &&
otherObject.objectId == CurrentExtensionObject)
break;
/* No exception applies, so throw the error */
otherObjDesc = getObjectDescription(&otherObject);
ereport(ERROR,
(errcode(ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST),
errmsg("cannot drop %s because %s requires it",
getObjectDescription(object),
otherObjDesc),
errhint("You can drop %s instead.",
otherObjDesc)));
}
/*
* 2. When recursing from the other end of this dependency,
* it's okay to continue with the deletion. This holds when
* recursing from a whole object that includes the nominal
* other end as a component, too. Since there can be more
* than one "owning" object, we have to allow matches that are
* more than one level down in the stack.
*/
if (stack_address_present_add_flags(&otherObject, 0, stack))
break;
/*
* 3. Not all the owning objects have been visited, so
* transform this deletion request into a delete of this
* owning object.
*
* First, release caller's lock on this object and get
* deletion lock on the owning object. (We must release
* caller's lock to avoid deadlock against a concurrent
* deletion of the owning object.)
*/
ReleaseDeletionLock(object);
AcquireDeletionLock(&otherObject, 0);
/*
* The owning object might have been deleted while we waited
* to lock it; if so, neither it nor the current object are
* interesting anymore. We test this by checking the
* pg_depend entry (see notes below).
*/
if (!systable_recheck_tuple(scan, tup))
{
systable_endscan(scan);
ReleaseDeletionLock(&otherObject);
return;
}
/*
* Okay, recurse to the owning object instead of proceeding.
*
* We do not need to stack the current object; we want the
* traversal order to be as if the original reference had
* linked to the owning object instead of this one.
*
* The dependency type is a "reverse" dependency: we need to
* delete the owning object if this one is to be deleted, but
* this linkage is never a reason for an automatic deletion.
*/
findDependentObjects(&otherObject,
DEPFLAG_REVERSE,
stack,
targetObjects,
pendingObjects,
depRel);
/* And we're done here. */
systable_endscan(scan);
return;
case DEPENDENCY_PIN:
/*
* Should not happen; PIN dependencies should have zeroes in
* the depender fields...
*/
elog(ERROR, "incorrect use of PIN dependency with %s",
getObjectDescription(object));
break;
default:
elog(ERROR, "unrecognized dependency type '%c' for %s",
foundDep->deptype, getObjectDescription(object));
break;
}
}
systable_endscan(scan);
/*
* Now recurse to any dependent objects. We must visit them first since
* they have to be deleted before the current object.
*/
mystack.object = object; /* set up a new stack level */
mystack.flags = flags;
mystack.next = stack;
ScanKeyInit(&key[0],
Anum_pg_depend_refclassid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(object->classId));
ScanKeyInit(&key[1],
Anum_pg_depend_refobjid,
BTEqualStrategyNumber, F_OIDEQ,
ObjectIdGetDatum(object->objectId));
if (object->objectSubId != 0)
{
ScanKeyInit(&key[2],
Anum_pg_depend_refobjsubid,
BTEqualStrategyNumber, F_INT4EQ,
Int32GetDatum(object->objectSubId));
nkeys = 3;
}
else
nkeys = 2;
scan = systable_beginscan(*depRel, DependReferenceIndexId, true,
SnapshotNow, nkeys, key);
while (HeapTupleIsValid(tup = systable_getnext(scan)))
{
Form_pg_depend foundDep = (Form_pg_depend) GETSTRUCT(tup);
int subflags;
otherObject.classId = foundDep->classid;
otherObject.objectId = foundDep->objid;
otherObject.objectSubId = foundDep->objsubid;
/*
* Must lock the dependent object before recursing to it.
*/
AcquireDeletionLock(&otherObject, 0);
/*
* The dependent object might have been deleted while we waited to
* lock it; if so, we don't need to do anything more with it. We can
* test this cheaply and independently of the object's type by seeing
* if the pg_depend tuple we are looking at is still live. (If the
* object got deleted, the tuple would have been deleted too.)
*/
if (!systable_recheck_tuple(scan, tup))
{
/* release the now-useless lock */
ReleaseDeletionLock(&otherObject);
/* and continue scanning for dependencies */
continue;
}
/* Recurse, passing flags indicating the dependency type */
switch (foundDep->deptype)
{
case DEPENDENCY_NORMAL:
subflags = DEPFLAG_NORMAL;
break;
case DEPENDENCY_AUTO:
subflags = DEPFLAG_AUTO;
break;
case DEPENDENCY_INTERNAL:
subflags = DEPFLAG_INTERNAL;
break;
case DEPENDENCY_EXTENSION:
subflags = DEPFLAG_EXTENSION;
break;
case DEPENDENCY_PIN:
/*
* For a PIN dependency we just ereport immediately; there
* won't be any others to report.
*/
ereport(ERROR,
(errcode(ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST),
errmsg("cannot drop %s because it is required by the database system",
getObjectDescription(object))));
subflags = 0; /* keep compiler quiet */
break;
default:
elog(ERROR, "unrecognized dependency type '%c' for %s",
foundDep->deptype, getObjectDescription(object));
subflags = 0; /* keep compiler quiet */
break;
}
findDependentObjects(&otherObject,
subflags,
&mystack,
targetObjects,
pendingObjects,
depRel);
}
systable_endscan(scan);
/*
* Finally, we can add the target object to targetObjects. Be careful to
* include any flags that were passed back down to us from inner recursion
* levels.
*/
extra.flags = mystack.flags;
if (stack)
extra.dependee = *stack->object;
else
memset(&extra.dependee, 0, sizeof(extra.dependee));
add_exact_object_address_extra(object, &extra, targetObjects);
}
| void free_object_addresses | ( | ObjectAddresses * | addrs | ) |
Definition at line 2193 of file dependency.c.
References ObjectAddresses::extras, pfree(), and ObjectAddresses::refs.
Referenced by AlterTableNamespace(), AlterTypeNamespace(), deleteWhatDependsOn(), makeConfigurationDependencies(), performDeletion(), performMultipleDeletions(), recordDependencyOnExpr(), recordDependencyOnSingleRelExpr(), RemoveObjects(), RemoveRelations(), and shdepDropOwned().
| ObjectClass getObjectClass | ( | const ObjectAddress * | object | ) |
Definition at line 2208 of file dependency.c.
References AccessMethodOperatorRelationId, AccessMethodProcedureRelationId, AttrDefaultRelationId, AuthIdRelationId, CastRelationId, ObjectAddress::classId, CollationRelationId, ConstraintRelationId, ConversionRelationId, DatabaseRelationId, DefaultAclRelationId, elog, ERROR, EventTriggerRelationId, ExtensionRelationId, ForeignDataWrapperRelationId, ForeignServerRelationId, LanguageRelationId, LargeObjectRelationId, NamespaceRelationId, ObjectAddress::objectSubId, OperatorClassRelationId, OperatorFamilyRelationId, OperatorRelationId, ProcedureRelationId, RelationRelationId, RewriteRelationId, TableSpaceRelationId, TriggerRelationId, TSConfigRelationId, TSDictionaryRelationId, TSParserRelationId, TSTemplateRelationId, TypeRelationId, and UserMappingRelationId.
Referenced by AlterObjectNamespace_oid(), ATExecAlterColumnType(), deleteObjectsInList(), doDeletion(), EventTriggerSQLDropAddObject(), getObjectDescription(), getObjectIdentity(), and getObjectTypeDescription().
{
/* only pg_class entries can have nonzero objectSubId */
if (object->classId != RelationRelationId &&
object->objectSubId != 0)
elog(ERROR, "invalid non-zero objectSubId for object class %u",
object->classId);
switch (object->classId)
{
case RelationRelationId:
/* caller must check objectSubId */
return OCLASS_CLASS;
case ProcedureRelationId:
return OCLASS_PROC;
case TypeRelationId:
return OCLASS_TYPE;
case CastRelationId:
return OCLASS_CAST;
case CollationRelationId:
return OCLASS_COLLATION;
case ConstraintRelationId:
return OCLASS_CONSTRAINT;
case ConversionRelationId:
return OCLASS_CONVERSION;
case AttrDefaultRelationId:
return OCLASS_DEFAULT;
case LanguageRelationId:
return OCLASS_LANGUAGE;
case LargeObjectRelationId:
return OCLASS_LARGEOBJECT;
case OperatorRelationId:
return OCLASS_OPERATOR;
case OperatorClassRelationId:
return OCLASS_OPCLASS;
case OperatorFamilyRelationId:
return OCLASS_OPFAMILY;
case AccessMethodOperatorRelationId:
return OCLASS_AMOP;
case AccessMethodProcedureRelationId:
return OCLASS_AMPROC;
case RewriteRelationId:
return OCLASS_REWRITE;
case TriggerRelationId:
return OCLASS_TRIGGER;
case NamespaceRelationId:
return OCLASS_SCHEMA;
case TSParserRelationId:
return OCLASS_TSPARSER;
case TSDictionaryRelationId:
return OCLASS_TSDICT;
case TSTemplateRelationId:
return OCLASS_TSTEMPLATE;
case TSConfigRelationId:
return OCLASS_TSCONFIG;
case AuthIdRelationId:
return OCLASS_ROLE;
case DatabaseRelationId:
return OCLASS_DATABASE;
case TableSpaceRelationId:
return OCLASS_TBLSPACE;
case ForeignDataWrapperRelationId:
return OCLASS_FDW;
case ForeignServerRelationId:
return OCLASS_FOREIGN_SERVER;
case UserMappingRelationId:
return OCLASS_USER_MAPPING;
case DefaultAclRelationId:
return OCLASS_DEFACL;
case ExtensionRelationId:
return OCLASS_EXTENSION;
case EventTriggerRelationId:
return OCLASS_EVENT_TRIGGER;
}
/* shouldn't get here */
elog(ERROR, "unrecognized object class: %u", object->classId);
return OCLASS_CLASS; /* keep compiler quiet */
}
| ObjectAddresses* new_object_addresses | ( | void | ) |
Definition at line 1966 of file dependency.c.
References ObjectAddresses::extras, ObjectAddresses::maxrefs, ObjectAddresses::numrefs, palloc(), and ObjectAddresses::refs.
Referenced by AlterExtensionNamespace(), AlterTableNamespace(), AlterTypeNamespace(), deleteWhatDependsOn(), makeConfigurationDependencies(), performDeletion(), performMultipleDeletions(), recordDependencyOnExpr(), recordDependencyOnSingleRelExpr(), RemoveObjects(), RemoveRelations(), and shdepDropOwned().
{
ObjectAddresses *addrs;
addrs = palloc(sizeof(ObjectAddresses));
addrs->numrefs = 0;
addrs->maxrefs = 32;
addrs->refs = (ObjectAddress *)
palloc(addrs->maxrefs * sizeof(ObjectAddress));
addrs->extras = NULL; /* until/unless needed */
return addrs;
}
| static int object_address_comparator | ( | const void * | a, | |
| const void * | b | |||
| ) | [static] |
Definition at line 1935 of file dependency.c.
References ObjectAddress::classId, ObjectAddress::objectId, and ObjectAddress::objectSubId.
Referenced by eliminate_duplicate_dependencies().
{
const ObjectAddress *obja = (const ObjectAddress *) a;
const ObjectAddress *objb = (const ObjectAddress *) b;
if (obja->classId < objb->classId)
return -1;
if (obja->classId > objb->classId)
return 1;
if (obja->objectId < objb->objectId)
return -1;
if (obja->objectId > objb->objectId)
return 1;
/*
* We sort the subId as an unsigned int so that 0 will come first. See
* logic in eliminate_duplicate_dependencies.
*/
if ((unsigned int) obja->objectSubId < (unsigned int) objb->objectSubId)
return -1;
if ((unsigned int) obja->objectSubId > (unsigned int) objb->objectSubId)
return 1;
return 0;
}
| bool object_address_present | ( | const ObjectAddress * | object, | |
| const ObjectAddresses * | addrs | |||
| ) |
Definition at line 2075 of file dependency.c.
References ObjectAddress::classId, i, ObjectAddresses::numrefs, ObjectAddress::objectId, ObjectAddress::objectSubId, and ObjectAddresses::refs.
Referenced by AlterConstraintNamespaces(), AlterIndexNamespaces(), AlterRelationNamespaceInternal(), AlterTypeNamespaceInternal(), and findDependentObjects().
{
int i;
for (i = addrs->numrefs - 1; i >= 0; i--)
{
const ObjectAddress *thisobj = addrs->refs + i;
if (object->classId == thisobj->classId &&
object->objectId == thisobj->objectId)
{
if (object->objectSubId == thisobj->objectSubId ||
thisobj->objectSubId == 0)
return true;
}
}
return false;
}
| static bool object_address_present_add_flags | ( | const ObjectAddress * | object, | |
| int | flags, | |||
| ObjectAddresses * | addrs | |||
| ) | [static] |
Definition at line 2101 of file dependency.c.
References ObjectAddress::classId, ObjectAddresses::extras, ObjectAddressExtra::flags, i, ObjectAddresses::numrefs, ObjectAddress::objectId, ObjectAddress::objectSubId, and ObjectAddresses::refs.
Referenced by findDependentObjects().
{
int i;
for (i = addrs->numrefs - 1; i >= 0; i--)
{
ObjectAddress *thisobj = addrs->refs + i;
if (object->classId == thisobj->classId &&
object->objectId == thisobj->objectId)
{
if (object->objectSubId == thisobj->objectSubId)
{
ObjectAddressExtra *thisextra = addrs->extras + i;
thisextra->flags |= flags;
return true;
}
if (thisobj->objectSubId == 0)
{
/*
* We get here if we find a need to delete a column after
* having already decided to drop its whole table. Obviously
* we no longer need to drop the column. But don't plaster
* its flags on the table.
*/
return true;
}
}
}
return false;
}
| void performDeletion | ( | const ObjectAddress * | object, | |
| DropBehavior | behavior, | |||
| int | flags | |||
| ) |
Definition at line 251 of file dependency.c.
References AcquireDeletionLock(), deleteObjectsInList(), DependRelationId, DEPFLAG_ORIGINAL, findDependentObjects(), free_object_addresses(), heap_close, heap_open(), new_object_addresses(), NOTICE, NULL, reportDependentObjects(), and RowExclusiveLock.
Referenced by AlterDomainDropConstraint(), ATExecDropColumn(), ATExecDropConstraint(), ATPostAlterTypeCleanup(), DefineQueryRewrite(), do_autovacuum(), dropOperators(), dropProcedures(), finish_heap_swap(), inv_drop(), PreCommit_on_commit_actions(), RemoveAttrDefault(), RemoveUserMapping(), and SetDefaultACL().
{
Relation depRel;
ObjectAddresses *targetObjects;
/*
* We save some cycles by opening pg_depend just once and passing the
* Relation pointer down to all the recursive deletion steps.
*/
depRel = heap_open(DependRelationId, RowExclusiveLock);
/*
* Acquire deletion lock on the target object. (Ideally the caller has
* done this already, but many places are sloppy about it.)
*/
AcquireDeletionLock(object, 0);
/*
* Construct a list of objects to delete (ie, the given object plus
* everything directly or indirectly dependent on it).
*/
targetObjects = new_object_addresses();
findDependentObjects(object,
DEPFLAG_ORIGINAL,
NULL, /* empty stack */
targetObjects,
NULL, /* no pendingObjects */
&depRel);
/*
* Check if deletion is allowed, and report about cascaded deletes.
*/
reportDependentObjects(targetObjects,
behavior,
NOTICE,
object);
/* do the deed */
deleteObjectsInList(targetObjects, &depRel, flags);
/* And clean up */
free_object_addresses(targetObjects);
heap_close(depRel, RowExclusiveLock);
}
| void performMultipleDeletions | ( | const ObjectAddresses * | objects, | |
| DropBehavior | behavior, | |||
| int | flags | |||
| ) |
Definition at line 309 of file dependency.c.
References AcquireDeletionLock(), deleteObjectsInList(), DependRelationId, DEPFLAG_ORIGINAL, findDependentObjects(), free_object_addresses(), heap_close, heap_open(), i, new_object_addresses(), NOTICE, NULL, ObjectAddresses::numrefs, ObjectAddresses::refs, reportDependentObjects(), and RowExclusiveLock.
Referenced by RemoveObjects(), RemoveRelations(), and shdepDropOwned().
{
Relation depRel;
ObjectAddresses *targetObjects;
int i;
/* No work if no objects... */
if (objects->numrefs <= 0)
return;
/*
* We save some cycles by opening pg_depend just once and passing the
* Relation pointer down to all the recursive deletion steps.
*/
depRel = heap_open(DependRelationId, RowExclusiveLock);
/*
* Construct a list of objects to delete (ie, the given objects plus
* everything directly or indirectly dependent on them). Note that
* because we pass the whole objects list as pendingObjects context, we
* won't get a failure from trying to delete an object that is internally
* dependent on another one in the list; we'll just skip that object and
* delete it when we reach its owner.
*/
targetObjects = new_object_addresses();
for (i = 0; i < objects->numrefs; i++)
{
const ObjectAddress *thisobj = objects->refs + i;
/*
* Acquire deletion lock on each target object. (Ideally the caller
* has done this already, but many places are sloppy about it.)
*/
AcquireDeletionLock(thisobj, flags);
findDependentObjects(thisobj,
DEPFLAG_ORIGINAL,
NULL, /* empty stack */
targetObjects,
objects,
&depRel);
}
/*
* Check if deletion is allowed, and report about cascaded deletes.
*
* If there's exactly one object being deleted, report it the same way as
* in performDeletion(), else we have to be vaguer.
*/
reportDependentObjects(targetObjects,
behavior,
NOTICE,
(objects->numrefs == 1 ? objects->refs : NULL));
/* do the deed */
deleteObjectsInList(targetObjects, &depRel, flags);
/* And clean up */
free_object_addresses(targetObjects);
heap_close(depRel, RowExclusiveLock);
}
| void record_object_address_dependencies | ( | const ObjectAddress * | depender, | |
| ObjectAddresses * | referenced, | |||
| DependencyType | behavior | |||
| ) |
Definition at line 2179 of file dependency.c.
References eliminate_duplicate_dependencies(), ObjectAddresses::numrefs, recordMultipleDependencies(), and ObjectAddresses::refs.
Referenced by makeConfigurationDependencies().
{
eliminate_duplicate_dependencies(referenced);
recordMultipleDependencies(depender,
referenced->refs, referenced->numrefs,
behavior);
}
| void recordDependencyOnExpr | ( | const ObjectAddress * | depender, | |
| Node * | expr, | |||
| List * | rtable, | |||
| DependencyType | behavior | |||
| ) |
Definition at line 1318 of file dependency.c.
References find_expr_references_context::addrs, eliminate_duplicate_dependencies(), find_expr_references_walker(), free_object_addresses(), list_make1, new_object_addresses(), ObjectAddresses::numrefs, recordMultipleDependencies(), ObjectAddresses::refs, and find_expr_references_context::rtables.
Referenced by CreateTrigger(), GenerateTypeDependencies(), InsertRule(), ProcedureCreate(), and StoreAttrDefault().
{
find_expr_references_context context;
context.addrs = new_object_addresses();
/* Set up interpretation for Vars at varlevelsup = 0 */
context.rtables = list_make1(rtable);
/* Scan the expression tree for referenceable objects */
find_expr_references_walker(expr, &context);
/* Remove any duplicates */
eliminate_duplicate_dependencies(context.addrs);
/* And record 'em */
recordMultipleDependencies(depender,
context.addrs->refs, context.addrs->numrefs,
behavior);
free_object_addresses(context.addrs);
}
| void recordDependencyOnSingleRelExpr | ( | const ObjectAddress * | depender, | |
| Node * | expr, | |||
| Oid | relId, | |||
| DependencyType | behavior, | |||
| DependencyType | self_behavior | |||
| ) |
Definition at line 1359 of file dependency.c.
References add_exact_object_address(), find_expr_references_context::addrs, ObjectAddress::classId, eliminate_duplicate_dependencies(), find_expr_references_walker(), free_object_addresses(), list_make1, MemSet, new_object_addresses(), ObjectAddresses::numrefs, ObjectAddress::objectId, recordMultipleDependencies(), ObjectAddresses::refs, RelationRelationId, RangeTblEntry::relid, RangeTblEntry::relkind, find_expr_references_context::rtables, RangeTblEntry::rtekind, and RangeTblEntry::type.
Referenced by CreateConstraintEntry(), and index_create().
{
find_expr_references_context context;
RangeTblEntry rte;
context.addrs = new_object_addresses();
/* We gin up a rather bogus rangetable list to handle Vars */
MemSet(&rte, 0, sizeof(rte));
rte.type = T_RangeTblEntry;
rte.rtekind = RTE_RELATION;
rte.relid = relId;
rte.relkind = RELKIND_RELATION; /* no need for exactness here */
context.rtables = list_make1(list_make1(&rte));
/* Scan the expression tree for referenceable objects */
find_expr_references_walker(expr, &context);
/* Remove any duplicates */
eliminate_duplicate_dependencies(context.addrs);
/* Separate self-dependencies if necessary */
if (behavior != self_behavior && context.addrs->numrefs > 0)
{
ObjectAddresses *self_addrs;
ObjectAddress *outobj;
int oldref,
outrefs;
self_addrs = new_object_addresses();
outobj = context.addrs->refs;
outrefs = 0;
for (oldref = 0; oldref < context.addrs->numrefs; oldref++)
{
ObjectAddress *thisobj = context.addrs->refs + oldref;
if (thisobj->classId == RelationRelationId &&
thisobj->objectId == relId)
{
/* Move this ref into self_addrs */
add_exact_object_address(thisobj, self_addrs);
}
else
{
/* Keep it in context.addrs */
*outobj = *thisobj;
outobj++;
outrefs++;
}
}
context.addrs->numrefs = outrefs;
/* Record the self-dependencies */
recordMultipleDependencies(depender,
self_addrs->refs, self_addrs->numrefs,
self_behavior);
free_object_addresses(self_addrs);
}
/* Record the external dependencies */
recordMultipleDependencies(depender,
context.addrs->refs, context.addrs->numrefs,
behavior);
free_object_addresses(context.addrs);
}
| static void ReleaseDeletionLock | ( | const ObjectAddress * | object | ) | [static] |
Definition at line 1293 of file dependency.c.
References AccessExclusiveLock, ObjectAddress::classId, ObjectAddress::objectId, RelationRelationId, UnlockDatabaseObject(), and UnlockRelationOid().
Referenced by findDependentObjects().
{
if (object->classId == RelationRelationId)
UnlockRelationOid(object->objectId, AccessExclusiveLock);
else
/* assume we should lock the whole object not a sub-object */
UnlockDatabaseObject(object->classId, object->objectId, 0,
AccessExclusiveLock);
}
| static void reportDependentObjects | ( | const ObjectAddresses * | targetObjects, | |
| DropBehavior | behavior, | |||
| int | msglevel, | |||
| const ObjectAddress * | origObject | |||
| ) | [static] |
Definition at line 838 of file dependency.c.
References _, appendStringInfo(), appendStringInfoChar(), client_min_messages, StringInfoData::data, DEBUG2, ObjectAddressExtra::dependee, DEPFLAG_AUTO, DEPFLAG_EXTENSION, DEPFLAG_INTERNAL, DEPFLAG_ORIGINAL, DROP_CASCADE, DROP_RESTRICT, ereport, errcode(), errdetail(), errdetail_log(), errhint(), errmsg(), errmsg_internal(), errmsg_plural(), ERROR, ObjectAddresses::extras, ObjectAddressExtra::flags, getObjectDescription(), i, initStringInfo(), StringInfoData::len, LOG, log_min_messages, MAX_REPORTED_DEPS, ngettext, ObjectAddresses::numrefs, pfree(), and ObjectAddresses::refs.
Referenced by deleteWhatDependsOn(), performDeletion(), and performMultipleDeletions().
{
bool ok = true;
StringInfoData clientdetail;
StringInfoData logdetail;
int numReportedClient = 0;
int numNotReportedClient = 0;
int i;
/*
* If no error is to be thrown, and the msglevel is too low to be shown to
* either client or server log, there's no need to do any of the work.
*
* Note: this code doesn't know all there is to be known about elog
* levels, but it works for NOTICE and DEBUG2, which are the only values
* msglevel can currently have. We also assume we are running in a normal
* operating environment.
*/
if (behavior == DROP_CASCADE &&
msglevel < client_min_messages &&
(msglevel < log_min_messages || log_min_messages == LOG))
return;
/*
* We limit the number of dependencies reported to the client to
* MAX_REPORTED_DEPS, since client software may not deal well with
* enormous error strings. The server log always gets a full report.
*/
#define MAX_REPORTED_DEPS 100
initStringInfo(&clientdetail);
initStringInfo(&logdetail);
/*
* We process the list back to front (ie, in dependency order not deletion
* order), since this makes for a more understandable display.
*/
for (i = targetObjects->numrefs - 1; i >= 0; i--)
{
const ObjectAddress *obj = &targetObjects->refs[i];
const ObjectAddressExtra *extra = &targetObjects->extras[i];
char *objDesc;
/* Ignore the original deletion target(s) */
if (extra->flags & DEPFLAG_ORIGINAL)
continue;
objDesc = getObjectDescription(obj);
/*
* If, at any stage of the recursive search, we reached the object via
* an AUTO, INTERNAL, or EXTENSION dependency, then it's okay to
* delete it even in RESTRICT mode.
*/
if (extra->flags & (DEPFLAG_AUTO |
DEPFLAG_INTERNAL |
DEPFLAG_EXTENSION))
{
/*
* auto-cascades are reported at DEBUG2, not msglevel. We don't
* try to combine them with the regular message because the
* results are too confusing when client_min_messages and
* log_min_messages are different.
*/
ereport(DEBUG2,
(errmsg("drop auto-cascades to %s",
objDesc)));
}
else if (behavior == DROP_RESTRICT)
{
char *otherDesc = getObjectDescription(&extra->dependee);
if (numReportedClient < MAX_REPORTED_DEPS)
{
/* separate entries with a newline */
if (clientdetail.len != 0)
appendStringInfoChar(&clientdetail, '\n');
appendStringInfo(&clientdetail, _("%s depends on %s"),
objDesc, otherDesc);
numReportedClient++;
}
else
numNotReportedClient++;
/* separate entries with a newline */
if (logdetail.len != 0)
appendStringInfoChar(&logdetail, '\n');
appendStringInfo(&logdetail, _("%s depends on %s"),
objDesc, otherDesc);
pfree(otherDesc);
ok = false;
}
else
{
if (numReportedClient < MAX_REPORTED_DEPS)
{
/* separate entries with a newline */
if (clientdetail.len != 0)
appendStringInfoChar(&clientdetail, '\n');
appendStringInfo(&clientdetail, _("drop cascades to %s"),
objDesc);
numReportedClient++;
}
else
numNotReportedClient++;
/* separate entries with a newline */
if (logdetail.len != 0)
appendStringInfoChar(&logdetail, '\n');
appendStringInfo(&logdetail, _("drop cascades to %s"),
objDesc);
}
pfree(objDesc);
}
if (numNotReportedClient > 0)
appendStringInfo(&clientdetail, ngettext("\nand %d other object "
"(see server log for list)",
"\nand %d other objects "
"(see server log for list)",
numNotReportedClient),
numNotReportedClient);
if (!ok)
{
if (origObject)
ereport(ERROR,
(errcode(ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST),
errmsg("cannot drop %s because other objects depend on it",
getObjectDescription(origObject)),
errdetail("%s", clientdetail.data),
errdetail_log("%s", logdetail.data),
errhint("Use DROP ... CASCADE to drop the dependent objects too.")));
else
ereport(ERROR,
(errcode(ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST),
errmsg("cannot drop desired object(s) because other objects depend on them"),
errdetail("%s", clientdetail.data),
errdetail_log("%s", logdetail.data),
errhint("Use DROP ... CASCADE to drop the dependent objects too.")));
}
else if (numReportedClient > 1)
{
ereport(msglevel,
/* translator: %d always has a value larger than 1 */
(errmsg_plural("drop cascades to %d other object",
"drop cascades to %d other objects",
numReportedClient + numNotReportedClient,
numReportedClient + numNotReportedClient),
errdetail("%s", clientdetail.data),
errdetail_log("%s", logdetail.data)));
}
else if (numReportedClient == 1)
{
/* we just use the single item as-is */
ereport(msglevel,
(errmsg_internal("%s", clientdetail.data)));
}
pfree(clientdetail.data);
pfree(logdetail.data);
}
| static bool stack_address_present_add_flags | ( | const ObjectAddress * | object, | |
| int | flags, | |||
| ObjectAddressStack * | stack | |||
| ) | [static] |
Definition at line 2141 of file dependency.c.
References ObjectAddress::classId, ObjectAddressStack::flags, ObjectAddressStack::next, ObjectAddressStack::object, ObjectAddress::objectId, and ObjectAddress::objectSubId.
Referenced by findDependentObjects().
{
ObjectAddressStack *stackptr;
for (stackptr = stack; stackptr; stackptr = stackptr->next)
{
const ObjectAddress *thisobj = stackptr->object;
if (object->classId == thisobj->classId &&
object->objectId == thisobj->objectId)
{
if (object->objectSubId == thisobj->objectSubId)
{
stackptr->flags |= flags;
return true;
}
/*
* Could visit column with whole table already on stack; this is
* the same case noted in object_address_present_add_flags(), and
* as in that case, we don't propagate flags for the component to
* the whole object.
*/
if (thisobj->objectSubId == 0)
return true;
}
}
return false;
}
const Oid object_classes[MAX_OCLASS] [static] |
Definition at line 126 of file dependency.c.
Referenced by add_object_address().
1.7.1