PostgreSQL Source Code git master
Macros | Functions
tid.c File Reference
#include "postgres.h"
#include <math.h>
#include <limits.h>
#include "access/sysattr.h"
#include "access/table.h"
#include "access/tableam.h"
#include "catalog/namespace.h"
#include "catalog/pg_type.h"
#include "common/hashfn.h"
#include "libpq/pqformat.h"
#include "miscadmin.h"
#include "parser/parsetree.h"
#include "utils/acl.h"
#include "utils/fmgrprotos.h"
#include "utils/lsyscache.h"
#include "utils/rel.h"
#include "utils/snapmgr.h"
#include "utils/varlena.h"
Include dependency graph for tid.c:

Go to the source code of this file.

Macros

#define  LDELIM   '('
 
#define  RDELIM   ')'
 
#define  DELIM   ','
 
#define  NTIDARGS   2
 

Functions

static ItemPointer  currtid_for_view (Relation viewrel, ItemPointer tid)
 
Datum  tidin (PG_FUNCTION_ARGS)
 
Datum  tidout (PG_FUNCTION_ARGS)
 
Datum  tidrecv (PG_FUNCTION_ARGS)
 
Datum  tidsend (PG_FUNCTION_ARGS)
 
Datum  tideq (PG_FUNCTION_ARGS)
 
Datum  tidne (PG_FUNCTION_ARGS)
 
Datum  tidlt (PG_FUNCTION_ARGS)
 
Datum  tidle (PG_FUNCTION_ARGS)
 
Datum  tidgt (PG_FUNCTION_ARGS)
 
Datum  tidge (PG_FUNCTION_ARGS)
 
Datum  bttidcmp (PG_FUNCTION_ARGS)
 
Datum  tidlarger (PG_FUNCTION_ARGS)
 
Datum  tidsmaller (PG_FUNCTION_ARGS)
 
Datum  hashtid (PG_FUNCTION_ARGS)
 
Datum  hashtidextended (PG_FUNCTION_ARGS)
 
static ItemPointer  currtid_internal (Relation rel, ItemPointer tid)
 
Datum  currtid_byrelname (PG_FUNCTION_ARGS)
 

Macro Definition Documentation

◆ DELIM

#define DELIM   ','

Definition at line 42 of file tid.c.

◆ LDELIM

#define LDELIM   '('

Definition at line 40 of file tid.c.

◆ NTIDARGS

#define NTIDARGS   2

Definition at line 43 of file tid.c.

◆ RDELIM

#define RDELIM   ')'

Definition at line 41 of file tid.c.

Function Documentation

◆ bttidcmp()

Datum bttidcmp ( PG_FUNCTION_ARGS  )

Definition at line 230 of file tid.c.

231{
234
236}
#define PG_RETURN_INT32(x)
Definition: fmgr.h:354
int32 ItemPointerCompare(ItemPointer arg1, ItemPointer arg2)
Definition: itemptr.c:51
#define PG_GETARG_ITEMPOINTER(n)
Definition: itemptr.h:242

References ItemPointerCompare(), PG_GETARG_ITEMPOINTER, and PG_RETURN_INT32.

◆ currtid_byrelname()

Datum currtid_byrelname ( PG_FUNCTION_ARGS  )

Definition at line 418 of file tid.c.

419{
422 ItemPointer result;
423 RangeVar *relrv;
424 Relation rel;
425
427 rel = table_openrv(relrv, AccessShareLock);
428
429 /* grab the latest tuple version associated to this CTID */
430 result = currtid_internal(rel, tid);
431
433
434 PG_RETURN_ITEMPOINTER(result);
435}
#define PG_GETARG_TEXT_PP(n)
Definition: fmgr.h:309
#define PG_RETURN_ITEMPOINTER(x)
Definition: itemptr.h:243
#define AccessShareLock
Definition: lockdefs.h:36
RangeVar * makeRangeVarFromNameList(const List *names)
Definition: namespace.c:3624
NameData relname
Definition: pg_class.h:38
Definition: rel.h:56
Definition: c.h:692
void table_close(Relation relation, LOCKMODE lockmode)
Definition: table.c:126
Relation table_openrv(const RangeVar *relation, LOCKMODE lockmode)
Definition: table.c:83
static ItemPointer currtid_internal(Relation rel, ItemPointer tid)
Definition: tid.c:296
List * textToQualifiedNameList(text *textval)
Definition: varlena.c:2686

References AccessShareLock, currtid_internal(), makeRangeVarFromNameList(), PG_GETARG_ITEMPOINTER, PG_GETARG_TEXT_PP, PG_RETURN_ITEMPOINTER, relname, table_close(), table_openrv(), and textToQualifiedNameList().

◆ currtid_for_view()

static ItemPointer currtid_for_view ( Relation  viewrel,
ItemPointer  tid 
)
static

Definition at line 338 of file tid.c.

339{
340 TupleDesc att = RelationGetDescr(viewrel);
341 RuleLock *rulelock;
342 RewriteRule *rewrite;
343 int i,
344 natts = att->natts,
345 tididx = -1;
346
347 for (i = 0; i < natts; i++)
348 {
349 Form_pg_attribute attr = TupleDescAttr(att, i);
350
351 if (strcmp(NameStr(attr->attname), "ctid") == 0)
352 {
353 if (attr->atttypid != TIDOID)
355 errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
356 errmsg("ctid isn't of type TID"));
357 tididx = i;
358 break;
359 }
360 }
361 if (tididx < 0)
363 errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
364 errmsg("currtid cannot handle views with no CTID"));
365 rulelock = viewrel->rd_rules;
366 if (!rulelock)
368 errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
369 errmsg("the view has no rules"));
370 for (i = 0; i < rulelock->numLocks; i++)
371 {
372 rewrite = rulelock->rules[i];
373 if (rewrite->event == CMD_SELECT)
374 {
375 Query *query;
376 TargetEntry *tle;
377
378 if (list_length(rewrite->actions) != 1)
380 errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
381 errmsg("only one select rule is allowed in views"));
382 query = (Query *) linitial(rewrite->actions);
383 tle = get_tle_by_resno(query->targetList, tididx + 1);
384 if (tle && tle->expr && IsA(tle->expr, Var))
385 {
386 Var *var = (Var *) tle->expr;
387 RangeTblEntry *rte;
388
389 if (!IS_SPECIAL_VARNO(var->varno) &&
391 {
392 rte = rt_fetch(var->varno, query->rtable);
393 if (rte)
394 {
395 ItemPointer result;
396 Relation rel;
397
398 rel = table_open(rte->relid, AccessShareLock);
399 result = currtid_internal(rel, tid);
401 return result;
402 }
403 }
404 }
405 break;
406 }
407 }
408 elog(ERROR, "currtid cannot handle this view");
409 return NULL;
410}
#define NameStr(name)
Definition: c.h:751
int errcode(int sqlerrcode)
Definition: elog.c:854
int errmsg(const char *fmt,...)
Definition: elog.c:1071
#define ERROR
Definition: elog.h:39
#define elog(elevel,...)
Definition: elog.h:226
#define ereport(elevel,...)
Definition: elog.h:150
i
int i
Definition: isn.c:77
if(TABLE==NULL||TABLE_index==NULL)
Definition: isn.c:81
#define IsA(nodeptr, _type_)
Definition: nodes.h:164
@ CMD_SELECT
Definition: nodes.h:275
TargetEntry * get_tle_by_resno(List *tlist, AttrNumber resno)
#define rt_fetch(rangetable_index, rangetable)
Definition: parsetree.h:31
FormData_pg_attribute * Form_pg_attribute
Definition: pg_attribute.h:202
static int list_length(const List *l)
Definition: pg_list.h:152
#define linitial(l)
Definition: pg_list.h:178
#define IS_SPECIAL_VARNO(varno)
Definition: primnodes.h:247
#define RelationGetDescr(relation)
Definition: rel.h:540
Definition: parsenodes.h:118
List * rtable
Definition: parsenodes.h:175
List * targetList
Definition: parsenodes.h:198
RuleLock * rd_rules
Definition: rel.h:115
CmdType event
Definition: prs2lock.h:27
List * actions
Definition: prs2lock.h:29
Definition: prs2lock.h:41
RewriteRule ** rules
Definition: prs2lock.h:43
int numLocks
Definition: prs2lock.h:42
Expr * expr
Definition: primnodes.h:2238
int natts
Definition: tupdesc.h:137
Definition: primnodes.h:262
AttrNumber varattno
Definition: primnodes.h:274
int varno
Definition: primnodes.h:269
#define SelfItemPointerAttributeNumber
Definition: sysattr.h:21
Relation table_open(Oid relationId, LOCKMODE lockmode)
Definition: table.c:40
static FormData_pg_attribute * TupleDescAttr(TupleDesc tupdesc, int i)
Definition: tupdesc.h:160

References AccessShareLock, RewriteRule::actions, CMD_SELECT, currtid_internal(), elog, ereport, errcode(), errmsg(), ERROR, RewriteRule::event, TargetEntry::expr, get_tle_by_resno(), i, if(), IS_SPECIAL_VARNO, IsA, linitial, list_length(), NameStr, TupleDescData::natts, RuleLock::numLocks, RelationData::rd_rules, RelationGetDescr, rt_fetch, Query::rtable, RuleLock::rules, SelfItemPointerAttributeNumber, table_close(), table_open(), Query::targetList, TupleDescAttr(), Var::varattno, and Var::varno.

Referenced by currtid_internal().

◆ currtid_internal()

static ItemPointer currtid_internal ( Relation  rel,
ItemPointer  tid 
)
static

Definition at line 296 of file tid.c.

297{
298 ItemPointer result;
299 AclResult aclresult;
300 Snapshot snapshot;
301 TableScanDesc scan;
302
303 result = (ItemPointer) palloc(sizeof(ItemPointerData));
304
305 aclresult = pg_class_aclcheck(RelationGetRelid(rel), GetUserId(),
306 ACL_SELECT);
307 if (aclresult != ACLCHECK_OK)
308 aclcheck_error(aclresult, get_relkind_objtype(rel->rd_rel->relkind),
310
311 if (rel->rd_rel->relkind == RELKIND_VIEW)
312 return currtid_for_view(rel, tid);
313
314 if (!RELKIND_HAS_STORAGE(rel->rd_rel->relkind))
316 errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
317 errmsg("cannot look at latest visible tid for relation \"%s.%s\"",
320
321 ItemPointerCopy(tid, result);
322
324 scan = table_beginscan_tid(rel, snapshot);
325 table_tuple_get_latest_tid(scan, result);
326 table_endscan(scan);
327 UnregisterSnapshot(snapshot);
328
329 return result;
330}
AclResult
Definition: acl.h:182
@ ACLCHECK_OK
Definition: acl.h:183
void aclcheck_error(AclResult aclerr, ObjectType objtype, const char *objectname)
Definition: aclchk.c:2652
AclResult pg_class_aclcheck(Oid table_oid, Oid roleid, AclMode mode)
Definition: aclchk.c:4037
ItemPointerData * ItemPointer
Definition: itemptr.h:49
static void ItemPointerCopy(const ItemPointerData *fromPointer, ItemPointerData *toPointer)
Definition: itemptr.h:172
char * get_namespace_name(Oid nspid)
Definition: lsyscache.c:3533
void * palloc(Size size)
Definition: mcxt.c:1365
Oid GetUserId(void)
Definition: miscinit.c:469
ObjectType get_relkind_objtype(char relkind)
#define ACL_SELECT
Definition: parsenodes.h:77
#define RelationGetRelid(relation)
Definition: rel.h:514
#define RelationGetRelationName(relation)
Definition: rel.h:548
#define RelationGetNamespace(relation)
Definition: rel.h:555
Snapshot GetLatestSnapshot(void)
Definition: snapmgr.c:353
void UnregisterSnapshot(Snapshot snapshot)
Definition: snapmgr.c:864
Snapshot RegisterSnapshot(Snapshot snapshot)
Definition: snapmgr.c:822
Form_pg_class rd_rel
Definition: rel.h:111
void table_tuple_get_latest_tid(TableScanDesc scan, ItemPointer tid)
Definition: tableam.c:236
static void table_endscan(TableScanDesc scan)
Definition: tableam.h:985
static TableScanDesc table_beginscan_tid(Relation rel, Snapshot snapshot)
Definition: tableam.h:961
static ItemPointer currtid_for_view(Relation viewrel, ItemPointer tid)
Definition: tid.c:338

References ACL_SELECT, aclcheck_error(), ACLCHECK_OK, currtid_for_view(), ereport, errcode(), errmsg(), ERROR, get_namespace_name(), get_relkind_objtype(), GetLatestSnapshot(), GetUserId(), ItemPointerCopy(), palloc(), pg_class_aclcheck(), RelationData::rd_rel, RegisterSnapshot(), RelationGetNamespace, RelationGetRelationName, RelationGetRelid, table_beginscan_tid(), table_endscan(), table_tuple_get_latest_tid(), and UnregisterSnapshot().

Referenced by currtid_byrelname(), and currtid_for_view().

◆ hashtid()

Datum hashtid ( PG_FUNCTION_ARGS  )

Definition at line 257 of file tid.c.

258{
260
261 /*
262 * While you'll probably have a lot of trouble with a compiler that
263 * insists on appending pad space to struct ItemPointerData, we can at
264 * least make this code work, by not using sizeof(ItemPointerData).
265 * Instead rely on knowing the sizes of the component fields.
266 */
267 return hash_any((unsigned char *) key,
268 sizeof(BlockIdData) + sizeof(OffsetNumber));
269}
static Datum hash_any(const unsigned char *k, int keylen)
Definition: hashfn.h:31
uint16 OffsetNumber
Definition: off.h:24
Definition: block.h:54

References hash_any(), sort-test::key, and PG_GETARG_ITEMPOINTER.

◆ hashtidextended()

Datum hashtidextended ( PG_FUNCTION_ARGS  )

Definition at line 272 of file tid.c.

273{
275 uint64 seed = PG_GETARG_INT64(1);
276
277 /* As above */
278 return hash_any_extended((unsigned char *) key,
279 sizeof(BlockIdData) + sizeof(OffsetNumber),
280 seed);
281}
uint64_t uint64
Definition: c.h:539
#define PG_GETARG_INT64(n)
Definition: fmgr.h:283
static Datum hash_any_extended(const unsigned char *k, int keylen, uint64 seed)
Definition: hashfn.h:37

References hash_any_extended(), sort-test::key, PG_GETARG_INT64, and PG_GETARG_ITEMPOINTER.

◆ tideq()

Datum tideq ( PG_FUNCTION_ARGS  )

Definition at line 176 of file tid.c.

177{
180
181 PG_RETURN_BOOL(ItemPointerCompare(arg1, arg2) == 0);
182}
#define PG_RETURN_BOOL(x)
Definition: fmgr.h:359

References ItemPointerCompare(), PG_GETARG_ITEMPOINTER, and PG_RETURN_BOOL.

◆ tidge()

Datum tidge ( PG_FUNCTION_ARGS  )

Definition at line 221 of file tid.c.

222{
225
226 PG_RETURN_BOOL(ItemPointerCompare(arg1, arg2) >= 0);
227}

References ItemPointerCompare(), PG_GETARG_ITEMPOINTER, and PG_RETURN_BOOL.

◆ tidgt()

Datum tidgt ( PG_FUNCTION_ARGS  )

Definition at line 212 of file tid.c.

213{
216
217 PG_RETURN_BOOL(ItemPointerCompare(arg1, arg2) > 0);
218}

References ItemPointerCompare(), PG_GETARG_ITEMPOINTER, and PG_RETURN_BOOL.

◆ tidin()

Datum tidin ( PG_FUNCTION_ARGS  )

Definition at line 52 of file tid.c.

53{
54 char *str = PG_GETARG_CSTRING(0);
55 Node *escontext = fcinfo->context;
56 char *p,
57 *coord[NTIDARGS];
58 int i;
59 ItemPointer result;
60 BlockNumber blockNumber;
61 OffsetNumber offsetNumber;
62 char *badp;
63 unsigned long cvt;
64
65 for (i = 0, p = str; *p && i < NTIDARGS && *p != RDELIM; p++)
66 if (*p == DELIM || (*p == LDELIM && i == 0))
67 coord[i++] = p + 1;
68
69 if (i < NTIDARGS)
70 ereturn(escontext, (Datum) 0,
71 (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
72 errmsg("invalid input syntax for type %s: \"%s\"",
73 "tid", str)));
74
75 errno = 0;
76 cvt = strtoul(coord[0], &badp, 10);
77 if (errno || *badp != DELIM)
78 ereturn(escontext, (Datum) 0,
79 (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
80 errmsg("invalid input syntax for type %s: \"%s\"",
81 "tid", str)));
82 blockNumber = (BlockNumber) cvt;
83
84 /*
85 * Cope with possibility that unsigned long is wider than BlockNumber, in
86 * which case strtoul will not raise an error for some values that are out
87 * of the range of BlockNumber. (See similar code in uint32in_subr().)
88 */
89#if SIZEOF_LONG > 4
90 if (cvt != (unsigned long) blockNumber &&
91 cvt != (unsigned long) ((int32) blockNumber))
92 ereturn(escontext, (Datum) 0,
93 (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
94 errmsg("invalid input syntax for type %s: \"%s\"",
95 "tid", str)));
96#endif
97
98 cvt = strtoul(coord[1], &badp, 10);
99 if (errno || *badp != RDELIM ||
100 cvt > USHRT_MAX)
101 ereturn(escontext, (Datum) 0,
102 (errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
103 errmsg("invalid input syntax for type %s: \"%s\"",
104 "tid", str)));
105 offsetNumber = (OffsetNumber) cvt;
106
107 result = (ItemPointer) palloc(sizeof(ItemPointerData));
108
109 ItemPointerSet(result, blockNumber, offsetNumber);
110
111 PG_RETURN_ITEMPOINTER(result);
112}
uint32 BlockNumber
Definition: block.h:31
int32_t int32
Definition: c.h:534
#define ereturn(context, dummy_value,...)
Definition: elog.h:278
#define PG_GETARG_CSTRING(n)
Definition: fmgr.h:277
const char * str
static void ItemPointerSet(ItemPointerData *pointer, BlockNumber blockNumber, OffsetNumber offNum)
Definition: itemptr.h:135
uint64_t Datum
Definition: postgres.h:70
Definition: nodes.h:135
#define DELIM
Definition: tid.c:42
#define NTIDARGS
Definition: tid.c:43
#define RDELIM
Definition: tid.c:41
#define LDELIM
Definition: tid.c:40

References DELIM, ereturn, errcode(), errmsg(), i, ItemPointerSet(), LDELIM, NTIDARGS, palloc(), PG_GETARG_CSTRING, PG_RETURN_ITEMPOINTER, RDELIM, and str.

Referenced by make_tuple_from_result_row().

◆ tidlarger()

Datum tidlarger ( PG_FUNCTION_ARGS  )

Definition at line 239 of file tid.c.

240{
243
244 PG_RETURN_ITEMPOINTER(ItemPointerCompare(arg1, arg2) >= 0 ? arg1 : arg2);
245}

References ItemPointerCompare(), PG_GETARG_ITEMPOINTER, and PG_RETURN_ITEMPOINTER.

◆ tidle()

Datum tidle ( PG_FUNCTION_ARGS  )

Definition at line 203 of file tid.c.

204{
207
208 PG_RETURN_BOOL(ItemPointerCompare(arg1, arg2) <= 0);
209}

References ItemPointerCompare(), PG_GETARG_ITEMPOINTER, and PG_RETURN_BOOL.

◆ tidlt()

Datum tidlt ( PG_FUNCTION_ARGS  )

Definition at line 194 of file tid.c.

195{
198
199 PG_RETURN_BOOL(ItemPointerCompare(arg1, arg2) < 0);
200}

References ItemPointerCompare(), PG_GETARG_ITEMPOINTER, and PG_RETURN_BOOL.

◆ tidne()

Datum tidne ( PG_FUNCTION_ARGS  )

Definition at line 185 of file tid.c.

186{
189
190 PG_RETURN_BOOL(ItemPointerCompare(arg1, arg2) != 0);
191}

References ItemPointerCompare(), PG_GETARG_ITEMPOINTER, and PG_RETURN_BOOL.

◆ tidout()

Datum tidout ( PG_FUNCTION_ARGS  )

Definition at line 119 of file tid.c.

120{
122 BlockNumber blockNumber;
123 OffsetNumber offsetNumber;
124 char buf[32];
125
126 blockNumber = ItemPointerGetBlockNumberNoCheck(itemPtr);
127 offsetNumber = ItemPointerGetOffsetNumberNoCheck(itemPtr);
128
129 /* Perhaps someday we should output this as a record. */
130 snprintf(buf, sizeof(buf), "(%u,%u)", blockNumber, offsetNumber);
131
133}
#define PG_RETURN_CSTRING(x)
Definition: fmgr.h:362
static OffsetNumber ItemPointerGetOffsetNumberNoCheck(const ItemPointerData *pointer)
Definition: itemptr.h:114
static BlockNumber ItemPointerGetBlockNumberNoCheck(const ItemPointerData *pointer)
Definition: itemptr.h:93
char * pstrdup(const char *in)
Definition: mcxt.c:1759
static char * buf
Definition: pg_test_fsync.c:72
#define snprintf
Definition: port.h:239

References buf, ItemPointerGetBlockNumberNoCheck(), ItemPointerGetOffsetNumberNoCheck(), PG_GETARG_ITEMPOINTER, PG_RETURN_CSTRING, pstrdup(), and snprintf.

Referenced by pgrowlocks().

◆ tidrecv()

Datum tidrecv ( PG_FUNCTION_ARGS  )

Definition at line 139 of file tid.c.

140{
142 ItemPointer result;
143 BlockNumber blockNumber;
144 OffsetNumber offsetNumber;
145
146 blockNumber = pq_getmsgint(buf, sizeof(blockNumber));
147 offsetNumber = pq_getmsgint(buf, sizeof(offsetNumber));
148
149 result = (ItemPointer) palloc(sizeof(ItemPointerData));
150
151 ItemPointerSet(result, blockNumber, offsetNumber);
152
153 PG_RETURN_ITEMPOINTER(result);
154}
#define PG_GETARG_POINTER(n)
Definition: fmgr.h:276
unsigned int pq_getmsgint(StringInfo msg, int b)
Definition: pqformat.c:415
struct StringInfoData * StringInfo
Definition: string.h:15

References buf, ItemPointerSet(), palloc(), PG_GETARG_POINTER, PG_RETURN_ITEMPOINTER, and pq_getmsgint().

◆ tidsend()

Datum tidsend ( PG_FUNCTION_ARGS  )

Definition at line 160 of file tid.c.

161{
164
169}
#define PG_RETURN_BYTEA_P(x)
Definition: fmgr.h:371
void pq_begintypsend(StringInfo buf)
Definition: pqformat.c:326
bytea * pq_endtypsend(StringInfo buf)
Definition: pqformat.c:346
static void pq_sendint32(StringInfo buf, uint32 i)
Definition: pqformat.h:144
static void pq_sendint16(StringInfo buf, uint16 i)
Definition: pqformat.h:136

References buf, ItemPointerGetBlockNumberNoCheck(), ItemPointerGetOffsetNumberNoCheck(), PG_GETARG_ITEMPOINTER, PG_RETURN_BYTEA_P, pq_begintypsend(), pq_endtypsend(), pq_sendint16(), and pq_sendint32().

◆ tidsmaller()

Datum tidsmaller ( PG_FUNCTION_ARGS  )

Definition at line 248 of file tid.c.

249{
252
253 PG_RETURN_ITEMPOINTER(ItemPointerCompare(arg1, arg2) <= 0 ? arg1 : arg2);
254}

References ItemPointerCompare(), PG_GETARG_ITEMPOINTER, and PG_RETURN_ITEMPOINTER.

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