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672 lines
14 KiB
C
672 lines
14 KiB
C
/*-------------------------------------------------------------------------
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*
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* syscache.c--
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* System cache management routines
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/utils/cache/syscache.c,v 1.18 1998/06/15 19:29:40 momjian Exp $
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*
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* NOTES
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* These routines allow the parser/planner/executor to perform
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* rapid lookups on the contents of the system catalogs.
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*
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* see catalog/syscache.h for a list of the cache id's
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "access/heapam.h"
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#include "access/htup.h"
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#include "catalog/catname.h"
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#include "utils/catcache.h"
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#ifndef HAVE_MEMMOVE
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#include <regex/utils.h>
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#else
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#include <string.h>
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#endif
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/* ----------------
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* hardwired attribute information comes from system catalog files.
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* ----------------
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*/
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#include "catalog/pg_am.h"
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#include "catalog/pg_amop.h"
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#include "catalog/pg_attribute.h"
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#include "catalog/pg_group.h"
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#include "catalog/pg_index.h"
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#include "catalog/pg_inherits.h"
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#include "catalog/pg_language.h"
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#include "catalog/pg_opclass.h"
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#include "catalog/pg_operator.h"
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#include "catalog/pg_proc.h"
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#include "catalog/pg_class.h"
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#include "catalog/pg_type.h"
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#include "catalog/pg_rewrite.h"
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#include "catalog/pg_aggregate.h"
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#include "catalog/pg_shadow.h"
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#include "storage/large_object.h"
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#include "catalog/pg_listener.h"
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extern bool AMI_OVERRIDE; /* XXX style */
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#include "utils/syscache.h"
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#include "catalog/indexing.h"
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typedef HeapTuple (*ScanFunc) ();
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/* ----------------
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* Warning: cacheinfo[] below is changed, then be sure and
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* update the magic constants in syscache.h!
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* ----------------
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*/
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static struct cachedesc cacheinfo[] = {
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{AccessMethodOperatorRelationName, /* AMOPOPID */
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3,
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{Anum_pg_amop_amopclaid,
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Anum_pg_amop_amopopr,
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Anum_pg_amop_amopid,
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0},
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sizeof(FormData_pg_amop),
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NULL,
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(ScanFunc) NULL},
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{AccessMethodOperatorRelationName, /* AMOPSTRATEGY */
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3,
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{Anum_pg_amop_amopid,
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Anum_pg_amop_amopclaid,
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Anum_pg_amop_amopstrategy,
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0},
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sizeof(FormData_pg_amop),
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NULL,
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(ScanFunc) NULL},
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{AttributeRelationName, /* ATTNAME */
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2,
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{Anum_pg_attribute_attrelid,
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Anum_pg_attribute_attname,
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0,
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0},
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ATTRIBUTE_TUPLE_SIZE,
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AttributeNameIndex,
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(ScanFunc) AttributeNameIndexScan},
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{AttributeRelationName, /* ATTNUM */
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2,
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{Anum_pg_attribute_attrelid,
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Anum_pg_attribute_attnum,
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0,
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0},
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ATTRIBUTE_TUPLE_SIZE,
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AttributeNumIndex,
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(ScanFunc) AttributeNumIndexScan},
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{IndexRelationName, /* INDEXRELID */
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1,
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{Anum_pg_index_indexrelid,
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0,
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0,
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0},
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offsetof(FormData_pg_index, indpred),
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NULL,
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NULL},
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{LanguageRelationName, /* LANNAME */
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1,
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{Anum_pg_language_lanname,
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0,
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0,
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0},
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offsetof(FormData_pg_language, lancompiler),
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NULL,
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NULL},
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{OperatorRelationName, /* OPRNAME */
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4,
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{Anum_pg_operator_oprname,
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Anum_pg_operator_oprleft,
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Anum_pg_operator_oprright,
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Anum_pg_operator_oprkind},
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sizeof(FormData_pg_operator),
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NULL,
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NULL},
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{OperatorRelationName, /* OPROID */
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1,
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{ObjectIdAttributeNumber,
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0,
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0,
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0},
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sizeof(FormData_pg_operator),
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NULL,
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(ScanFunc) NULL},
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{ProcedureRelationName, /* PRONAME */
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3,
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{Anum_pg_proc_proname,
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Anum_pg_proc_pronargs,
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Anum_pg_proc_proargtypes,
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0},
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offsetof(FormData_pg_proc, prosrc),
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ProcedureNameIndex,
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(ScanFunc) ProcedureNameIndexScan},
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{ProcedureRelationName, /* PROOID */
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1,
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{ObjectIdAttributeNumber,
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0,
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0,
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0},
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offsetof(FormData_pg_proc, prosrc),
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ProcedureOidIndex,
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(ScanFunc) ProcedureOidIndexScan},
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{RelationRelationName, /* RELNAME */
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1,
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{Anum_pg_class_relname,
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0,
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0,
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0},
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CLASS_TUPLE_SIZE,
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ClassNameIndex,
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(ScanFunc) ClassNameIndexScan},
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{RelationRelationName, /* RELOID */
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1,
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{ObjectIdAttributeNumber,
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0,
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0,
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0},
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CLASS_TUPLE_SIZE,
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ClassOidIndex,
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(ScanFunc) ClassOidIndexScan},
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{TypeRelationName, /* TYPNAME */
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1,
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{Anum_pg_type_typname,
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0,
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0,
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0},
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offsetof(TypeTupleFormData, typalign) +sizeof(char),
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TypeNameIndex,
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TypeNameIndexScan},
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{TypeRelationName, /* TYPOID */
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1,
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{ObjectIdAttributeNumber,
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0,
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0,
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0},
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offsetof(TypeTupleFormData, typalign) +sizeof(char),
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TypeOidIndex,
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TypeOidIndexScan},
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{AccessMethodRelationName, /* AMNAME */
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1,
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{Anum_pg_am_amname,
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0,
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0,
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0},
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sizeof(FormData_pg_am),
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NULL,
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NULL},
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{OperatorClassRelationName, /* CLANAME */
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1,
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{Anum_pg_opclass_opcname,
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0,
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0,
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0},
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sizeof(FormData_pg_opclass),
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NULL,
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NULL},
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{IndexRelationName, /* INDRELIDKEY */
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2,
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{Anum_pg_index_indrelid,
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Anum_pg_index_indkey,
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0,
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0},
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offsetof(FormData_pg_index, indpred),
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NULL,
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(ScanFunc) NULL},
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{InheritsRelationName, /* INHRELID */
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2,
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{Anum_pg_inherits_inhrel,
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Anum_pg_inherits_inhseqno,
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0,
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0},
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sizeof(FormData_pg_inherits),
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NULL,
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(ScanFunc) NULL},
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{RewriteRelationName, /* RULOID */
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1,
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{ObjectIdAttributeNumber,
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0,
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0,
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0},
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offsetof(FormData_pg_rewrite, ev_qual),
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NULL,
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(ScanFunc) NULL},
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{AggregateRelationName, /* AGGNAME */
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2,
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{Anum_pg_aggregate_aggname,
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Anum_pg_aggregate_aggbasetype,
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0,
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0},
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offsetof(FormData_pg_aggregate, agginitval1),
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NULL,
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(ScanFunc) NULL},
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{ListenerRelationName, /* LISTENREL */
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2,
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{Anum_pg_listener_relname,
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Anum_pg_listener_pid,
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0,
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0},
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sizeof(FormData_pg_listener),
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NULL,
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(ScanFunc) NULL},
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{ShadowRelationName, /* USENAME */
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1,
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{Anum_pg_shadow_usename,
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0,
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0,
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0},
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sizeof(FormData_pg_shadow),
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NULL,
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(ScanFunc) NULL},
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{ShadowRelationName, /* USESYSID */
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1,
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{Anum_pg_shadow_usesysid,
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0,
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0,
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0},
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sizeof(FormData_pg_shadow),
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NULL,
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(ScanFunc) NULL},
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{GroupRelationName, /* GRONAME */
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1,
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{Anum_pg_group_groname,
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0,
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0,
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0},
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offsetof(FormData_pg_group, grolist[0]),
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NULL,
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(ScanFunc) NULL},
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{GroupRelationName, /* GROSYSID */
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1,
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{Anum_pg_group_grosysid,
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0,
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0,
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0},
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offsetof(FormData_pg_group, grolist[0]),
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NULL,
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(ScanFunc) NULL},
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{RewriteRelationName, /* REWRITENAME */
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1,
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{Anum_pg_rewrite_rulename,
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0,
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0,
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0},
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offsetof(FormData_pg_rewrite, ev_qual),
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NULL,
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(ScanFunc) NULL},
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{ProcedureRelationName, /* PROSRC */
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1,
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{Anum_pg_proc_prosrc,
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0,
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0,
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0},
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offsetof(FormData_pg_proc, prosrc),
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ProcedureSrcIndex,
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(ScanFunc) ProcedureSrcIndexScan},
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{OperatorClassRelationName, /* CLADEFTYPE */
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1,
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{Anum_pg_opclass_opcdeftype,
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0,
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0,
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0},
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sizeof(FormData_pg_opclass),
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NULL,
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(ScanFunc) NULL},
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{LanguageRelationName, /* LANOID */
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1,
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{ObjectIdAttributeNumber,
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0,
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0,
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0},
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offsetof(FormData_pg_language, lancompiler),
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NULL,
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NULL}
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};
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static struct catcache *SysCache[
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lengthof(cacheinfo)];
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static int32 SysCacheSize = lengthof(cacheinfo);
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/*
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* zerocaches--
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*
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* Make sure the SysCache structure is zero'd.
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*/
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void
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zerocaches()
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{
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MemSet((char *) SysCache, 0, SysCacheSize * sizeof(struct catcache *));
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}
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/*
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* Note:
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* This function was written because the initialized catalog caches
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* are used to determine which caches may contain tuples which need
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* to be invalidated in other backends.
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*/
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void
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InitCatalogCache()
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{
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int cacheId; /* XXX type */
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if (!AMI_OVERRIDE)
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{
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for (cacheId = 0; cacheId < SysCacheSize; cacheId += 1)
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{
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Assert(!PointerIsValid((Pointer) SysCache[cacheId]));
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SysCache[cacheId] =
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InitSysCache(cacheinfo[cacheId].name,
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cacheinfo[cacheId].indname,
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cacheId,
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cacheinfo[cacheId].nkeys,
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cacheinfo[cacheId].key,
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cacheinfo[cacheId].iScanFunc);
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if (!PointerIsValid((char *) SysCache[cacheId]))
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{
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elog(ERROR,
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"InitCatalogCache: Can't init cache %.16s(%d)",
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cacheinfo[cacheId].name,
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cacheId);
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}
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}
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}
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}
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/*
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* SearchSysCacheTuple--
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*
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* A layer on top of SearchSysCache that does the initialization and
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* key-setting for you.
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*
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* Returns the tuple if one is found, NULL if not.
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*
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* XXX The tuple that is returned is NOT supposed to be pfree'd!
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*/
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HeapTuple
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SearchSysCacheTuple(int cacheId,/* cache selection code */
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Datum key1,
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Datum key2,
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Datum key3,
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Datum key4)
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{
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HeapTuple tp;
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if (cacheId < 0 || cacheId >= SysCacheSize)
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{
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elog(ERROR, "SearchSysCacheTuple: Bad cache id %d", cacheId);
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return ((HeapTuple) NULL);
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}
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Assert(AMI_OVERRIDE || PointerIsValid(SysCache[cacheId]));
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if (!PointerIsValid(SysCache[cacheId]))
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{
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SysCache[cacheId] =
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InitSysCache(cacheinfo[cacheId].name,
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cacheinfo[cacheId].indname,
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cacheId,
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cacheinfo[cacheId].nkeys,
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cacheinfo[cacheId].key,
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cacheinfo[cacheId].iScanFunc);
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if (!PointerIsValid(SysCache[cacheId]))
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elog(ERROR,
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"InitCatalogCache: Can't init cache %.16s(%d)",
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cacheinfo[cacheId].name,
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cacheId);
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}
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tp = SearchSysCache(SysCache[cacheId], key1, key2, key3, key4);
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if (!HeapTupleIsValid(tp))
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{
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#ifdef CACHEDEBUG
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elog(DEBUG,
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"SearchSysCacheTuple: Search %s(%d) %d %d %d %d failed",
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cacheinfo[cacheId].name,
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cacheId, key1, key2, key3, key4);
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#endif
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return ((HeapTuple) NULL);
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}
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return (tp);
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}
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/*
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* SearchSysCacheStruct--
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* Fills 's' with the information retrieved by calling SearchSysCache()
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* with arguments key1...key4. Retrieves only the portion of the tuple
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* which is not variable-length.
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*
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* NOTE: we are assuming that non-variable-length fields in the system
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* catalogs will always be defined!
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*
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* Returns 1L if a tuple was found, 0L if not.
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*/
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int32
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SearchSysCacheStruct(int cacheId, /* cache selection code */
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char *returnStruct, /* (preallocated!) */
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Datum key1,
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Datum key2,
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Datum key3,
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Datum key4)
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{
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HeapTuple tp;
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if (!PointerIsValid(returnStruct))
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{
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elog(ERROR, "SearchSysCacheStruct: No receiving struct");
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return (0);
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}
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tp = SearchSysCacheTuple(cacheId, key1, key2, key3, key4);
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if (!HeapTupleIsValid(tp))
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return (0);
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memmove(returnStruct, (char *) GETSTRUCT(tp), cacheinfo[cacheId].size);
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return (1);
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}
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/*
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* SearchSysCacheGetAttribute--
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* Returns the attribute corresponding to 'attributeNumber' for
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* a given cached tuple.
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*
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* XXX This re-opens a relation, so this is slower.
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*
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* [callers all assume this returns a (struct varlena *). -ay 10/94]
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*/
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void *
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SearchSysCacheGetAttribute(int cacheId,
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AttrNumber attributeNumber,
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Datum key1,
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Datum key2,
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Datum key3,
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Datum key4)
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{
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HeapTuple tp;
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char *cacheName;
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Relation relation;
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int32 attributeLength,
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attributeByValue;
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bool isNull;
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Datum attributeValue;
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void *returnValue;
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tp = SearchSysCacheTuple(cacheId, key1, key2, key3, key4);
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cacheName = cacheinfo[cacheId].name;
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if (!HeapTupleIsValid(tp))
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{
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#ifdef CACHEDEBUG
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elog(DEBUG,
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"SearchSysCacheGetAttribute: Lookup in %s(%d) failed",
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cacheName, cacheId);
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#endif /* defined(CACHEDEBUG) */
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return (NULL);
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}
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relation = heap_openr(cacheName);
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if (attributeNumber < 0 &&
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attributeNumber > FirstLowInvalidHeapAttributeNumber)
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{
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attributeLength = heap_sysattrlen(attributeNumber);
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attributeByValue = heap_sysattrbyval(attributeNumber);
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}
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else if (attributeNumber > 0 &&
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attributeNumber <= relation->rd_rel->relnatts)
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{
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attributeLength =
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relation->rd_att->attrs[attributeNumber - 1]->attlen;
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attributeByValue =
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relation->rd_att->attrs[attributeNumber - 1]->attbyval;
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}
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else
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{
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elog(ERROR,
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"SearchSysCacheGetAttribute: Bad attr # %d in %s(%d)",
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attributeNumber, cacheName, cacheId);
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return (NULL);
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}
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attributeValue = heap_getattr(tp,
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attributeNumber,
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RelationGetTupleDescriptor(relation),
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&isNull);
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if (isNull)
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{
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/*
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* Used to be an elog(DEBUG, ...) here and a claim that it should
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* be a FATAL error, I don't think either is warranted -mer 6/9/92
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*/
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return (NULL);
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}
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if (attributeByValue)
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returnValue = (void *) attributeValue;
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else
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{
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char *tmp;
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int size = (attributeLength < 0)
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? VARSIZE((struct varlena *) attributeValue) /* variable length */
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: attributeLength; /* fixed length */
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tmp = (char *) palloc(size);
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memmove(tmp, (void *) attributeValue, size);
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returnValue = (void *) tmp;
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}
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heap_close(relation);
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return (returnValue);
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}
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/*
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* TypeDefaultRetrieve--
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*
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|
* Given a type OID, return the typdefault field associated with that
|
|
* type. The typdefault is returned as the car of a dotted pair which
|
|
* is passed to TypeDefaultRetrieve by the calling routine.
|
|
*
|
|
* Returns a fixnum for types which are passed by value and a ppreserve'd
|
|
* vectori for types which are not.
|
|
*
|
|
* [identical to get_typdefault, expecting a (struct varlena *) as ret val.
|
|
* some day, either of the functions should be removed -ay 10/94]
|
|
*/
|
|
void *
|
|
TypeDefaultRetrieve(Oid typId)
|
|
{
|
|
HeapTuple typeTuple;
|
|
TypeTupleForm type;
|
|
int32 typByVal,
|
|
typLen;
|
|
struct varlena *typDefault;
|
|
int32 dataSize;
|
|
void *returnValue;
|
|
|
|
typeTuple = SearchSysCacheTuple(TYPOID,
|
|
ObjectIdGetDatum(typId),
|
|
0, 0, 0);
|
|
|
|
if (!HeapTupleIsValid(typeTuple))
|
|
{
|
|
#ifdef CACHEDEBUG
|
|
elog(DEBUG, "TypeDefaultRetrieve: Lookup in %s(%d) failed",
|
|
cacheinfo[TYPOID].name, TYPOID);
|
|
#endif /* defined(CACHEDEBUG) */
|
|
return (NULL);
|
|
}
|
|
|
|
type = (TypeTupleForm) GETSTRUCT(typeTuple);
|
|
typByVal = type->typbyval;
|
|
typLen = type->typlen;
|
|
|
|
typDefault = (struct varlena *)
|
|
SearchSysCacheGetAttribute(TYPOID,
|
|
Anum_pg_type_typdefault,
|
|
ObjectIdGetDatum(typId),
|
|
0, 0, 0);
|
|
|
|
if (typDefault == (struct varlena *) NULL)
|
|
{
|
|
#ifdef CACHEDEBUG
|
|
elog(DEBUG, "TypeDefaultRetrieve: No extractable typdefault in %s(%d)",
|
|
cacheinfo[TYPOID].name, TYPOID);
|
|
#endif /* defined(CACHEDEBUG) */
|
|
return (NULL);
|
|
|
|
}
|
|
|
|
dataSize = VARSIZE(typDefault) - VARHDRSZ;
|
|
|
|
if (typByVal)
|
|
{
|
|
int8 i8;
|
|
int16 i16;
|
|
int32 i32;
|
|
|
|
if (dataSize == typLen)
|
|
{
|
|
switch (typLen)
|
|
{
|
|
case sizeof(int8):
|
|
memmove((char *) &i8, VARDATA(typDefault), sizeof(int8));
|
|
i32 = i8;
|
|
break;
|
|
case sizeof(int16):
|
|
memmove((char *) &i16, VARDATA(typDefault), sizeof(int16));
|
|
i32 = i16;
|
|
break;
|
|
case sizeof(int32):
|
|
memmove((char *) &i32, VARDATA(typDefault), sizeof(int32));
|
|
break;
|
|
}
|
|
returnValue = (void *) i32;
|
|
}
|
|
else
|
|
returnValue = NULL;
|
|
}
|
|
else
|
|
{
|
|
if ((typLen < 0 && dataSize < 0) || dataSize != typLen)
|
|
returnValue = NULL;
|
|
else
|
|
{
|
|
returnValue = (void *) palloc(VARSIZE(typDefault));
|
|
memmove((char *) returnValue,
|
|
(char *) typDefault,
|
|
(int) VARSIZE(typDefault));
|
|
}
|
|
}
|
|
|
|
return (returnValue);
|
|
}
|