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heapfuncs.c
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1 /*-------------------------------------------------------------------------
2  *
3  * heapfuncs.c
4  * Functions to investigate heap pages
5  *
6  * We check the input to these functions for corrupt pointers etc. that
7  * might cause crashes, but at the same time we try to print out as much
8  * information as possible, even if it's nonsense. That's because if a
9  * page is corrupt, we don't know why and how exactly it is corrupt, so we
10  * let the user judge it.
11  *
12  * These functions are restricted to superusers for the fear of introducing
13  * security holes if the input checking isn't as water-tight as it should be.
14  * You'd need to be superuser to obtain a raw page image anyway, so
15  * there's hardly any use case for using these without superuser-rights
16  * anyway.
17  *
18  * Copyright (c) 2007-2020, PostgreSQL Global Development Group
19  *
20  * IDENTIFICATION
21  * contrib/pageinspect/heapfuncs.c
22  *
23  *-------------------------------------------------------------------------
24  */
25 
26 #include "postgres.h"
27 
28 #include "access/htup_details.h"
29 #include "access/relation.h"
30 #include "catalog/pg_am_d.h"
31 #include "catalog/pg_type.h"
32 #include "funcapi.h"
33 #include "mb/pg_wchar.h"
34 #include "miscadmin.h"
35 #include "pageinspect.h"
36 #include "port/pg_bitutils.h"
37 #include "utils/array.h"
38 #include "utils/builtins.h"
39 #include "utils/rel.h"
40 
41 /*
42  * It's not supported to create tuples with oids anymore, but when pg_upgrade
43  * was used to upgrade from an older version, tuples might still have an
44  * oid. Seems worthwhile to display that.
45  */
46 #define HeapTupleHeaderGetOidOld(tup) \
47 ( \
48  ((tup)->t_infomask & HEAP_HASOID_OLD) ? \
49  *((Oid *) ((char *)(tup) + (tup)->t_hoff - sizeof(Oid))) \
50  : \
51  InvalidOid \
52 )
53 
54 
55 /*
56  * bits_to_text
57  *
58  * Converts a bits8-array of 'len' bits to a human-readable
59  * c-string representation.
60  */
61 static char *
62 bits_to_text(bits8 *bits, int len)
63 {
64  int i;
65  char *str;
66 
67  str = palloc(len + 1);
68 
69  for (i = 0; i < len; i++)
70  str[i] = (bits[(i / 8)] & (1 << (i % 8))) ? '1' : '0';
71 
72  str[i] = '\0';
73 
74  return str;
75 }
76 
77 
78 /*
79  * text_to_bits
80  *
81  * Converts a c-string representation of bits into a bits8-array. This is
82  * the reverse operation of previous routine.
83  */
84 static bits8 *
85 text_to_bits(char *str, int len)
86 {
87  bits8 *bits;
88  int off = 0;
89  char byte = 0;
90 
91  bits = palloc(len + 1);
92 
93  while (off < len)
94  {
95  if (off % 8 == 0)
96  byte = 0;
97 
98  if ((str[off] == '0') || (str[off] == '1'))
99  byte = byte | ((str[off] - '0') << off % 8);
100  else
101  ereport(ERROR,
103  errmsg("invalid character \"%.*s\" in t_bits string",
104  pg_mblen(str + off), str + off)));
105 
106  if (off % 8 == 7)
107  bits[off / 8] = byte;
108 
109  off++;
110  }
111 
112  return bits;
113 }
114 
115 /*
116  * heap_page_items
117  *
118  * Allows inspection of line pointers and tuple headers of a heap page.
119  */
121 
122 typedef struct heap_page_items_state
123 {
128 
129 Datum
131 {
132  bytea *raw_page = PG_GETARG_BYTEA_P(0);
133  heap_page_items_state *inter_call_data = NULL;
134  FuncCallContext *fctx;
135  int raw_page_size;
136 
137  if (!superuser())
138  ereport(ERROR,
139  (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
140  errmsg("must be superuser to use raw page functions")));
141 
142  raw_page_size = VARSIZE(raw_page) - VARHDRSZ;
143 
144  if (SRF_IS_FIRSTCALL())
145  {
146  TupleDesc tupdesc;
147  MemoryContext mctx;
148 
149  if (raw_page_size < SizeOfPageHeaderData)
150  ereport(ERROR,
151  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
152  errmsg("input page too small (%d bytes)", raw_page_size)));
153 
154  fctx = SRF_FIRSTCALL_INIT();
156 
157  inter_call_data = palloc(sizeof(heap_page_items_state));
158 
159  /* Build a tuple descriptor for our result type */
160  if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
161  elog(ERROR, "return type must be a row type");
162 
163  inter_call_data->tupd = tupdesc;
164 
165  inter_call_data->offset = FirstOffsetNumber;
166  inter_call_data->page = VARDATA(raw_page);
167 
168  fctx->max_calls = PageGetMaxOffsetNumber(inter_call_data->page);
169  fctx->user_fctx = inter_call_data;
170 
171  MemoryContextSwitchTo(mctx);
172  }
173 
174  fctx = SRF_PERCALL_SETUP();
175  inter_call_data = fctx->user_fctx;
176 
177  if (fctx->call_cntr < fctx->max_calls)
178  {
179  Page page = inter_call_data->page;
180  HeapTuple resultTuple;
181  Datum result;
182  ItemId id;
183  Datum values[14];
184  bool nulls[14];
185  uint16 lp_offset;
186  uint16 lp_flags;
187  uint16 lp_len;
188 
189  memset(nulls, 0, sizeof(nulls));
190 
191  /* Extract information from the line pointer */
192 
193  id = PageGetItemId(page, inter_call_data->offset);
194 
195  lp_offset = ItemIdGetOffset(id);
196  lp_flags = ItemIdGetFlags(id);
197  lp_len = ItemIdGetLength(id);
198 
199  values[0] = UInt16GetDatum(inter_call_data->offset);
200  values[1] = UInt16GetDatum(lp_offset);
201  values[2] = UInt16GetDatum(lp_flags);
202  values[3] = UInt16GetDatum(lp_len);
203 
204  /*
205  * We do just enough validity checking to make sure we don't reference
206  * data outside the page passed to us. The page could be corrupt in
207  * many other ways, but at least we won't crash.
208  */
209  if (ItemIdHasStorage(id) &&
210  lp_len >= MinHeapTupleSize &&
211  lp_offset == MAXALIGN(lp_offset) &&
212  lp_offset + lp_len <= raw_page_size)
213  {
214  HeapTupleHeader tuphdr;
215  bytea *tuple_data_bytea;
216  int tuple_data_len;
217 
218  /* Extract information from the tuple header */
219 
220  tuphdr = (HeapTupleHeader) PageGetItem(page, id);
221 
222  values[4] = UInt32GetDatum(HeapTupleHeaderGetRawXmin(tuphdr));
223  values[5] = UInt32GetDatum(HeapTupleHeaderGetRawXmax(tuphdr));
224  /* shared with xvac */
225  values[6] = UInt32GetDatum(HeapTupleHeaderGetRawCommandId(tuphdr));
226  values[7] = PointerGetDatum(&tuphdr->t_ctid);
227  values[8] = UInt32GetDatum(tuphdr->t_infomask2);
228  values[9] = UInt32GetDatum(tuphdr->t_infomask);
229  values[10] = UInt8GetDatum(tuphdr->t_hoff);
230 
231  /* Copy raw tuple data into bytea attribute */
232  tuple_data_len = lp_len - tuphdr->t_hoff;
233  tuple_data_bytea = (bytea *) palloc(tuple_data_len + VARHDRSZ);
234  SET_VARSIZE(tuple_data_bytea, tuple_data_len + VARHDRSZ);
235  memcpy(VARDATA(tuple_data_bytea), (char *) tuphdr + tuphdr->t_hoff,
236  tuple_data_len);
237  values[13] = PointerGetDatum(tuple_data_bytea);
238 
239  /*
240  * We already checked that the item is completely within the raw
241  * page passed to us, with the length given in the line pointer.
242  * Let's check that t_hoff doesn't point over lp_len, before using
243  * it to access t_bits and oid.
244  */
245  if (tuphdr->t_hoff >= SizeofHeapTupleHeader &&
246  tuphdr->t_hoff <= lp_len &&
247  tuphdr->t_hoff == MAXALIGN(tuphdr->t_hoff))
248  {
249  if (tuphdr->t_infomask & HEAP_HASNULL)
250  {
251  int bits_len;
252 
253  bits_len =
255  values[11] = CStringGetTextDatum(bits_to_text(tuphdr->t_bits, bits_len));
256  }
257  else
258  nulls[11] = true;
259 
260  if (tuphdr->t_infomask & HEAP_HASOID_OLD)
261  values[12] = HeapTupleHeaderGetOidOld(tuphdr);
262  else
263  nulls[12] = true;
264  }
265  else
266  {
267  nulls[11] = true;
268  nulls[12] = true;
269  }
270  }
271  else
272  {
273  /*
274  * The line pointer is not used, or it's invalid. Set the rest of
275  * the fields to NULL
276  */
277  int i;
278 
279  for (i = 4; i <= 13; i++)
280  nulls[i] = true;
281  }
282 
283  /* Build and return the result tuple. */
284  resultTuple = heap_form_tuple(inter_call_data->tupd, values, nulls);
285  result = HeapTupleGetDatum(resultTuple);
286 
287  inter_call_data->offset++;
288 
289  SRF_RETURN_NEXT(fctx, result);
290  }
291  else
292  SRF_RETURN_DONE(fctx);
293 }
294 
295 /*
296  * tuple_data_split_internal
297  *
298  * Split raw tuple data taken directly from a page into an array of bytea
299  * elements. This routine does a lookup on NULL values and creates array
300  * elements accordingly. This is a reimplementation of nocachegetattr()
301  * in heaptuple.c simplified for educational purposes.
302  */
303 static Datum
304 tuple_data_split_internal(Oid relid, char *tupdata,
305  uint16 tupdata_len, uint16 t_infomask,
306  uint16 t_infomask2, bits8 *t_bits,
307  bool do_detoast)
308 {
309  ArrayBuildState *raw_attrs;
310  int nattrs;
311  int i;
312  int off = 0;
313  Relation rel;
314  TupleDesc tupdesc;
315 
316  /* Get tuple descriptor from relation OID */
317  rel = relation_open(relid, AccessShareLock);
318  tupdesc = RelationGetDescr(rel);
319 
320  raw_attrs = initArrayResult(BYTEAOID, CurrentMemoryContext, false);
321  nattrs = tupdesc->natts;
322 
323  if (rel->rd_rel->relam != HEAP_TABLE_AM_OID)
324  ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
325  errmsg("only heap AM is supported")));
326 
327  if (nattrs < (t_infomask2 & HEAP_NATTS_MASK))
328  ereport(ERROR,
330  errmsg("number of attributes in tuple header is greater than number of attributes in tuple descriptor")));
331 
332  for (i = 0; i < nattrs; i++)
333  {
334  Form_pg_attribute attr;
335  bool is_null;
336  bytea *attr_data = NULL;
337 
338  attr = TupleDescAttr(tupdesc, i);
339 
340  /*
341  * Tuple header can specify less attributes than tuple descriptor as
342  * ALTER TABLE ADD COLUMN without DEFAULT keyword does not actually
343  * change tuples in pages, so attributes with numbers greater than
344  * (t_infomask2 & HEAP_NATTS_MASK) should be treated as NULL.
345  */
346  if (i >= (t_infomask2 & HEAP_NATTS_MASK))
347  is_null = true;
348  else
349  is_null = (t_infomask & HEAP_HASNULL) && att_isnull(i, t_bits);
350 
351  if (!is_null)
352  {
353  int len;
354 
355  if (attr->attlen == -1)
356  {
357  off = att_align_pointer(off, attr->attalign, -1,
358  tupdata + off);
359 
360  /*
361  * As VARSIZE_ANY throws an exception if it can't properly
362  * detect the type of external storage in macros VARTAG_SIZE,
363  * this check is repeated to have a nicer error handling.
364  */
365  if (VARATT_IS_EXTERNAL(tupdata + off) &&
366  !VARATT_IS_EXTERNAL_ONDISK(tupdata + off) &&
367  !VARATT_IS_EXTERNAL_INDIRECT(tupdata + off))
368  ereport(ERROR,
370  errmsg("first byte of varlena attribute is incorrect for attribute %d", i)));
371 
372  len = VARSIZE_ANY(tupdata + off);
373  }
374  else
375  {
376  off = att_align_nominal(off, attr->attalign);
377  len = attr->attlen;
378  }
379 
380  if (tupdata_len < off + len)
381  ereport(ERROR,
383  errmsg("unexpected end of tuple data")));
384 
385  if (attr->attlen == -1 && do_detoast)
386  attr_data = DatumGetByteaPCopy(tupdata + off);
387  else
388  {
389  attr_data = (bytea *) palloc(len + VARHDRSZ);
390  SET_VARSIZE(attr_data, len + VARHDRSZ);
391  memcpy(VARDATA(attr_data), tupdata + off, len);
392  }
393 
394  off = att_addlength_pointer(off, attr->attlen,
395  tupdata + off);
396  }
397 
398  raw_attrs = accumArrayResult(raw_attrs, PointerGetDatum(attr_data),
399  is_null, BYTEAOID, CurrentMemoryContext);
400  if (attr_data)
401  pfree(attr_data);
402  }
403 
404  if (tupdata_len != off)
405  ereport(ERROR,
407  errmsg("end of tuple reached without looking at all its data")));
408 
410 
411  return makeArrayResult(raw_attrs, CurrentMemoryContext);
412 }
413 
414 /*
415  * tuple_data_split
416  *
417  * Split raw tuple data taken directly from page into distinct elements
418  * taking into account null values.
419  */
421 
422 Datum
424 {
425  Oid relid;
426  bytea *raw_data;
427  uint16 t_infomask;
428  uint16 t_infomask2;
429  char *t_bits_str;
430  bool do_detoast = false;
431  bits8 *t_bits = NULL;
432  Datum res;
433 
434  relid = PG_GETARG_OID(0);
435  raw_data = PG_ARGISNULL(1) ? NULL : PG_GETARG_BYTEA_P(1);
436  t_infomask = PG_GETARG_INT16(2);
437  t_infomask2 = PG_GETARG_INT16(3);
438  t_bits_str = PG_ARGISNULL(4) ? NULL :
440 
441  if (PG_NARGS() >= 6)
442  do_detoast = PG_GETARG_BOOL(5);
443 
444  if (!superuser())
445  ereport(ERROR,
446  (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
447  errmsg("must be superuser to use raw page functions")));
448 
449  if (!raw_data)
450  PG_RETURN_NULL();
451 
452  /*
453  * Convert t_bits string back to the bits8 array as represented in the
454  * tuple header.
455  */
456  if (t_infomask & HEAP_HASNULL)
457  {
458  int bits_str_len;
459  int bits_len;
460 
461  bits_len = BITMAPLEN(t_infomask2 & HEAP_NATTS_MASK) * BITS_PER_BYTE;
462  if (!t_bits_str)
463  ereport(ERROR,
465  errmsg("t_bits string must not be NULL")));
466 
467  bits_str_len = strlen(t_bits_str);
468  if (bits_len != bits_str_len)
469  ereport(ERROR,
471  errmsg("unexpected length of t_bits string: %u, expected %u",
472  bits_str_len, bits_len)));
473 
474  /* do the conversion */
475  t_bits = text_to_bits(t_bits_str, bits_str_len);
476  }
477  else
478  {
479  if (t_bits_str)
480  ereport(ERROR,
482  errmsg("t_bits string is expected to be NULL, but instead it is %zu bytes long",
483  strlen(t_bits_str))));
484  }
485 
486  /* Split tuple data */
487  res = tuple_data_split_internal(relid, (char *) raw_data + VARHDRSZ,
488  VARSIZE(raw_data) - VARHDRSZ,
489  t_infomask, t_infomask2, t_bits,
490  do_detoast);
491 
492  if (t_bits)
493  pfree(t_bits);
494 
496 }
497 
498 /*
499  * heap_tuple_infomask_flags
500  *
501  * Decode into a human-readable format t_infomask and t_infomask2 associated
502  * to a tuple. All the flags are described in access/htup_details.h.
503  */
505 
506 Datum
508 {
509 #define HEAP_TUPLE_INFOMASK_COLS 2
511  bool nulls[HEAP_TUPLE_INFOMASK_COLS];
512  uint16 t_infomask = PG_GETARG_INT16(0);
513  uint16 t_infomask2 = PG_GETARG_INT16(1);
514  int cnt = 0;
515  ArrayType *a;
516  int bitcnt;
517  Datum *flags;
518  TupleDesc tupdesc;
519  HeapTuple tuple;
520 
521  if (!superuser())
522  ereport(ERROR,
523  (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
524  errmsg("must be superuser to use raw page functions")));
525 
526  /* Build a tuple descriptor for our result type */
527  if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
528  elog(ERROR, "return type must be a row type");
529 
530  bitcnt = pg_popcount((const char *) &t_infomask, sizeof(uint16)) +
531  pg_popcount((const char *) &t_infomask2, sizeof(uint16));
532 
533  /* Initialize values and NULL flags arrays */
534  MemSet(values, 0, sizeof(values));
535  MemSet(nulls, 0, sizeof(nulls));
536 
537  /* If no flags, return a set of empty arrays */
538  if (bitcnt <= 0)
539  {
540  values[0] = PointerGetDatum(construct_empty_array(TEXTOID));
541  values[1] = PointerGetDatum(construct_empty_array(TEXTOID));
542  tuple = heap_form_tuple(tupdesc, values, nulls);
544  }
545 
546  /* build set of raw flags */
547  flags = (Datum *) palloc0(sizeof(Datum) * bitcnt);
548 
549  /* decode t_infomask */
550  if ((t_infomask & HEAP_HASNULL) != 0)
551  flags[cnt++] = CStringGetTextDatum("HEAP_HASNULL");
552  if ((t_infomask & HEAP_HASVARWIDTH) != 0)
553  flags[cnt++] = CStringGetTextDatum("HEAP_HASVARWIDTH");
554  if ((t_infomask & HEAP_HASEXTERNAL) != 0)
555  flags[cnt++] = CStringGetTextDatum("HEAP_HASEXTERNAL");
556  if ((t_infomask & HEAP_HASOID_OLD) != 0)
557  flags[cnt++] = CStringGetTextDatum("HEAP_HASOID_OLD");
558  if ((t_infomask & HEAP_XMAX_KEYSHR_LOCK) != 0)
559  flags[cnt++] = CStringGetTextDatum("HEAP_XMAX_KEYSHR_LOCK");
560  if ((t_infomask & HEAP_COMBOCID) != 0)
561  flags[cnt++] = CStringGetTextDatum("HEAP_COMBOCID");
562  if ((t_infomask & HEAP_XMAX_EXCL_LOCK) != 0)
563  flags[cnt++] = CStringGetTextDatum("HEAP_XMAX_EXCL_LOCK");
564  if ((t_infomask & HEAP_XMAX_LOCK_ONLY) != 0)
565  flags[cnt++] = CStringGetTextDatum("HEAP_XMAX_LOCK_ONLY");
566  if ((t_infomask & HEAP_XMIN_COMMITTED) != 0)
567  flags[cnt++] = CStringGetTextDatum("HEAP_XMIN_COMMITTED");
568  if ((t_infomask & HEAP_XMIN_INVALID) != 0)
569  flags[cnt++] = CStringGetTextDatum("HEAP_XMIN_INVALID");
570  if ((t_infomask & HEAP_XMAX_COMMITTED) != 0)
571  flags[cnt++] = CStringGetTextDatum("HEAP_XMAX_COMMITTED");
572  if ((t_infomask & HEAP_XMAX_INVALID) != 0)
573  flags[cnt++] = CStringGetTextDatum("HEAP_XMAX_INVALID");
574  if ((t_infomask & HEAP_XMAX_IS_MULTI) != 0)
575  flags[cnt++] = CStringGetTextDatum("HEAP_XMAX_IS_MULTI");
576  if ((t_infomask & HEAP_UPDATED) != 0)
577  flags[cnt++] = CStringGetTextDatum("HEAP_UPDATED");
578  if ((t_infomask & HEAP_MOVED_OFF) != 0)
579  flags[cnt++] = CStringGetTextDatum("HEAP_MOVED_OFF");
580  if ((t_infomask & HEAP_MOVED_IN) != 0)
581  flags[cnt++] = CStringGetTextDatum("HEAP_MOVED_IN");
582 
583  /* decode t_infomask2 */
584  if ((t_infomask2 & HEAP_KEYS_UPDATED) != 0)
585  flags[cnt++] = CStringGetTextDatum("HEAP_KEYS_UPDATED");
586  if ((t_infomask2 & HEAP_HOT_UPDATED) != 0)
587  flags[cnt++] = CStringGetTextDatum("HEAP_HOT_UPDATED");
588  if ((t_infomask2 & HEAP_ONLY_TUPLE) != 0)
589  flags[cnt++] = CStringGetTextDatum("HEAP_ONLY_TUPLE");
590 
591  /* build value */
592  Assert(cnt <= bitcnt);
593  a = construct_array(flags, cnt, TEXTOID, -1, false, TYPALIGN_INT);
594  values[0] = PointerGetDatum(a);
595 
596  /*
597  * Build set of combined flags. Use the same array as previously, this
598  * keeps the code simple.
599  */
600  cnt = 0;
601  MemSet(flags, 0, sizeof(Datum) * bitcnt);
602 
603  /* decode combined masks of t_infomask */
604  if ((t_infomask & HEAP_XMAX_SHR_LOCK) == HEAP_XMAX_SHR_LOCK)
605  flags[cnt++] = CStringGetTextDatum("HEAP_XMAX_SHR_LOCK");
606  if ((t_infomask & HEAP_XMIN_FROZEN) == HEAP_XMIN_FROZEN)
607  flags[cnt++] = CStringGetTextDatum("HEAP_XMIN_FROZEN");
608  if ((t_infomask & HEAP_MOVED) == HEAP_MOVED)
609  flags[cnt++] = CStringGetTextDatum("HEAP_MOVED");
610 
611  /* Build an empty array if there are no combined flags */
612  if (cnt == 0)
613  a = construct_empty_array(TEXTOID);
614  else
615  a = construct_array(flags, cnt, TEXTOID, -1, false, TYPALIGN_INT);
616  pfree(flags);
617  values[1] = PointerGetDatum(a);
618 
619  /* Returns the record as Datum */
620  tuple = heap_form_tuple(tupdesc, values, nulls);
622 }
#define DatumGetByteaPCopy(X)
Definition: fmgr.h:296
uint64 call_cntr
Definition: funcapi.h:65
#define VARATT_IS_EXTERNAL_ONDISK(PTR)
Definition: postgres.h:314
#define SizeofHeapTupleHeader
Definition: htup_details.h:184
#define HEAP_XMAX_KEYSHR_LOCK
Definition: htup_details.h:193
#define HEAP_ONLY_TUPLE
Definition: htup_details.h:281
TypeFuncClass get_call_result_type(FunctionCallInfo fcinfo, Oid *resultTypeId, TupleDesc *resultTupleDesc)
Definition: funcapi.c:205
#define VARDATA(PTR)
Definition: postgres.h:302
#define HEAP_XMAX_LOCK_ONLY
Definition: htup_details.h:196
#define att_align_nominal(cur_offset, attalign)
Definition: tupmacs.h:148
#define MinHeapTupleSize
Definition: htup_details.h:561
bits8 t_bits[FLEXIBLE_ARRAY_MEMBER]
Definition: htup_details.h:177
ArrayBuildState * initArrayResult(Oid element_type, MemoryContext rcontext, bool subcontext)
Definition: arrayfuncs.c:5041
#define RelationGetDescr(relation)
Definition: rel.h:482
#define BITS_PER_BYTE
#define HEAP_TUPLE_INFOMASK_COLS
#define VARSIZE(PTR)
Definition: postgres.h:303
#define att_isnull(ATT, BITS)
Definition: tupmacs.h:25
#define SRF_IS_FIRSTCALL()
Definition: funcapi.h:293
#define PointerGetDatum(X)
Definition: postgres.h:556
HeapTupleHeaderData * HeapTupleHeader
Definition: htup.h:23
#define TupleDescAttr(tupdesc, i)
Definition: tupdesc.h:92
#define VARHDRSZ
Definition: c.h:568
#define HEAP_XMIN_FROZEN
Definition: htup_details.h:205
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
ArrayType * construct_array(Datum *elems, int nelems, Oid elmtype, int elmlen, bool elmbyval, char elmalign)
Definition: arrayfuncs.c:3313
#define AccessShareLock
Definition: lockdefs.h:36
int errcode(int sqlerrcode)
Definition: elog.c:610
bool superuser(void)
Definition: superuser.c:46
#define MemSet(start, val, len)
Definition: c.h:949
#define BITMAPLEN(NATTS)
Definition: htup_details.h:547
#define HEAP_XMAX_COMMITTED
Definition: htup_details.h:206
HeapTuple heap_form_tuple(TupleDesc tupleDescriptor, Datum *values, bool *isnull)
Definition: heaptuple.c:1020
#define PG_GETARG_BOOL(n)
Definition: fmgr.h:274
ArrayType * construct_empty_array(Oid elmtype)
Definition: arrayfuncs.c:3432
#define HEAP_UPDATED
Definition: htup_details.h:209
#define SizeOfPageHeaderData
Definition: bufpage.h:216
Form_pg_class rd_rel
Definition: rel.h:109
unsigned int Oid
Definition: postgres_ext.h:31
#define HEAP_XMAX_SHR_LOCK
Definition: htup_details.h:199
#define PageGetMaxOffsetNumber(page)
Definition: bufpage.h:357
#define SRF_PERCALL_SETUP()
Definition: funcapi.h:297
uint64 pg_popcount(const char *buf, int bytes)
Definition: pg_bitutils.c:282
#define PG_GETARG_TEXT_PP(n)
Definition: fmgr.h:308
#define HEAP_XMIN_INVALID
Definition: htup_details.h:204
#define SRF_RETURN_NEXT(_funcctx, _result)
Definition: funcapi.h:299
#define VARATT_IS_EXTERNAL(PTR)
Definition: postgres.h:313
#define PG_GETARG_BYTEA_P(n)
Definition: fmgr.h:334
#define HeapTupleHeaderGetRawXmax(tup)
Definition: htup_details.h:375
unsigned short uint16
Definition: c.h:373
void pfree(void *pointer)
Definition: mcxt.c:1057
#define ItemIdGetLength(itemId)
Definition: itemid.h:59
#define VARATT_IS_EXTERNAL_INDIRECT(PTR)
Definition: postgres.h:316
#define HEAP_HASNULL
Definition: htup_details.h:189
#define UInt8GetDatum(X)
Definition: postgres.h:437
#define ERROR
Definition: elog.h:43
#define HEAP_XMAX_INVALID
Definition: htup_details.h:207
#define HeapTupleHeaderGetNatts(tup)
Definition: htup_details.h:531
Relation relation_open(Oid relationId, LOCKMODE lockmode)
Definition: relation.c:48
ItemPointerData t_ctid
Definition: htup_details.h:160
Datum heap_tuple_infomask_flags(PG_FUNCTION_ARGS)
Definition: heapfuncs.c:507
#define PG_GETARG_OID(n)
Definition: fmgr.h:275
#define FirstOffsetNumber
Definition: off.h:27
#define HEAP_XMAX_EXCL_LOCK
Definition: htup_details.h:195
static bits8 * text_to_bits(char *str, int len)
Definition: heapfuncs.c:85
FormData_pg_attribute * Form_pg_attribute
Definition: pg_attribute.h:193
struct heap_page_items_state heap_page_items_state
#define UInt32GetDatum(X)
Definition: postgres.h:493
#define ItemIdGetOffset(itemId)
Definition: itemid.h:65
MemoryContext CurrentMemoryContext
Definition: mcxt.c:38
#define HEAP_MOVED_IN
Definition: htup_details.h:213
#define HEAP_HASVARWIDTH
Definition: htup_details.h:190
#define HeapTupleHeaderGetOidOld(tup)
Definition: heapfuncs.c:46
#define PG_RETURN_ARRAYTYPE_P(x)
Definition: array.h:253
#define att_addlength_pointer(cur_offset, attlen, attptr)
Definition: tupmacs.h:176
Datum makeArrayResult(ArrayBuildState *astate, MemoryContext rcontext)
Definition: arrayfuncs.c:5144
#define byte(x, n)
Definition: rijndael.c:68
#define ERRCODE_DATA_CORRUPTED
Definition: pg_basebackup.c:45
#define PageGetItemId(page, offsetNumber)
Definition: bufpage.h:235
uint8 bits8
Definition: c.h:381
#define ItemIdGetFlags(itemId)
Definition: itemid.h:71
void * palloc0(Size size)
Definition: mcxt.c:981
uintptr_t Datum
Definition: postgres.h:367
#define PG_RETURN_DATUM(x)
Definition: fmgr.h:352
#define HEAP_KEYS_UPDATED
Definition: htup_details.h:278
#define att_align_pointer(cur_offset, attalign, attlen, attptr)
Definition: tupmacs.h:126
#define PG_GETARG_INT16(n)
Definition: fmgr.h:271
#define HEAP_XMAX_IS_MULTI
Definition: htup_details.h:208
#define VARSIZE_ANY(PTR)
Definition: postgres.h:335
#define HEAP_XMIN_COMMITTED
Definition: htup_details.h:203
#define HEAP_MOVED
Definition: htup_details.h:216
#define ereport(elevel,...)
Definition: elog.h:144
#define ItemIdHasStorage(itemId)
Definition: itemid.h:120
Datum tuple_data_split(PG_FUNCTION_ARGS)
Definition: heapfuncs.c:423
PG_FUNCTION_INFO_V1(heap_page_items)
#define PG_ARGISNULL(n)
Definition: fmgr.h:209
#define HEAP_NATTS_MASK
Definition: htup_details.h:276
#define HEAP_COMBOCID
Definition: htup_details.h:194
void relation_close(Relation relation, LOCKMODE lockmode)
Definition: relation.c:206
#define HEAP_MOVED_OFF
Definition: htup_details.h:210
#define Assert(condition)
Definition: c.h:745
MemoryContext multi_call_memory_ctx
Definition: funcapi.h:101
#define MAXALIGN(LEN)
Definition: c.h:698
#define HeapTupleHeaderGetRawXmin(tup)
Definition: htup_details.h:308
#define PG_NARGS()
Definition: fmgr.h:203
int pg_mblen(const char *mbstr)
Definition: mbutils.c:907
#define HeapTupleGetDatum(tuple)
Definition: funcapi.h:220
static Datum tuple_data_split_internal(Oid relid, char *tupdata, uint16 tupdata_len, uint16 t_infomask, uint16 t_infomask2, bits8 *t_bits, bool do_detoast)
Definition: heapfuncs.c:304
static Datum values[MAXATTR]
Definition: bootstrap.c:165
char * text_to_cstring(const text *t)
Definition: varlena.c:221
ArrayBuildState * accumArrayResult(ArrayBuildState *astate, Datum dvalue, bool disnull, Oid element_type, MemoryContext rcontext)
Definition: arrayfuncs.c:5080
#define HeapTupleHeaderGetRawCommandId(tup)
Definition: htup_details.h:391
void * user_fctx
Definition: funcapi.h:82
void * palloc(Size size)
Definition: mcxt.c:950
int errmsg(const char *fmt,...)
Definition: elog.c:824
#define elog(elevel,...)
Definition: elog.h:214
int i
#define HEAP_HOT_UPDATED
Definition: htup_details.h:280
#define CStringGetTextDatum(s)
Definition: builtins.h:86
#define HEAP_HASEXTERNAL
Definition: htup_details.h:191
#define HEAP_HASOID_OLD
Definition: htup_details.h:192
Definition: c.h:562
#define PG_FUNCTION_ARGS
Definition: fmgr.h:193
#define SET_VARSIZE(PTR, len)
Definition: postgres.h:329
Datum heap_page_items(PG_FUNCTION_ARGS)
Definition: heapfuncs.c:130
static char * bits_to_text(bits8 *bits, int len)
Definition: heapfuncs.c:62
#define UInt16GetDatum(X)
Definition: postgres.h:465
#define PG_RETURN_NULL()
Definition: fmgr.h:344
uint64 max_calls
Definition: funcapi.h:74
#define PageGetItem(page, itemId)
Definition: bufpage.h:340
Pointer Page
Definition: bufpage.h:78
#define SRF_RETURN_DONE(_funcctx)
Definition: funcapi.h:317
#define SRF_FIRSTCALL_INIT()
Definition: funcapi.h:295