Line data Source code
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) 2007-2025, 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 "port/pg_bitutils.h"
36 : #include "utils/array.h"
37 : #include "utils/builtins.h"
38 : #include "utils/rel.h"
39 :
40 : /*
41 : * It's not supported to create tuples with oids anymore, but when pg_upgrade
42 : * was used to upgrade from an older version, tuples might still have an
43 : * oid. Seems worthwhile to display that.
44 : */
45 : static inline Oid
46 0 : HeapTupleHeaderGetOidOld(const HeapTupleHeaderData *tup)
47 : {
48 0 : if (tup->t_infomask & HEAP_HASOID_OLD)
49 0 : return *((Oid *) ((char *) (tup) + (tup)->t_hoff - sizeof(Oid)));
50 : else
51 0 : return 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 8 : bits_to_text(bits8 *bits, int len)
63 : {
64 : int i;
65 : char *str;
66 :
67 8 : str = palloc(len + 1);
68 :
69 72 : for (i = 0; i < len; i++)
70 64 : str[i] = (bits[(i / 8)] & (1 << (i % 8))) ? '1' : '0';
71 :
72 8 : str[i] = '\0';
73 :
74 8 : 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 4 : text_to_bits(char *str, int len)
86 : {
87 : bits8 *bits;
88 4 : int off = 0;
89 4 : char byte = 0;
90 :
91 4 : bits = palloc(len + 1);
92 :
93 36 : while (off < len)
94 : {
95 32 : if (off % 8 == 0)
96 4 : byte = 0;
97 :
98 32 : if ((str[off] == '0') || (str[off] == '1'))
99 32 : byte = byte | ((str[off] - '0') << off % 8);
100 : else
101 0 : ereport(ERROR,
102 : (errcode(ERRCODE_DATA_CORRUPTED),
103 : errmsg("invalid character \"%.*s\" in t_bits string",
104 : pg_mblen(str + off), str + off)));
105 :
106 32 : if (off % 8 == 7)
107 4 : bits[off / 8] = byte;
108 :
109 32 : off++;
110 : }
111 :
112 4 : return bits;
113 : }
114 :
115 : /*
116 : * heap_page_items
117 : *
118 : * Allows inspection of line pointers and tuple headers of a heap page.
119 : */
120 16 : PG_FUNCTION_INFO_V1(heap_page_items);
121 :
122 : typedef struct heap_page_items_state
123 : {
124 : TupleDesc tupd;
125 : Page page;
126 : uint16 offset;
127 : } heap_page_items_state;
128 :
129 : Datum
130 126 : heap_page_items(PG_FUNCTION_ARGS)
131 : {
132 126 : bytea *raw_page = PG_GETARG_BYTEA_P(0);
133 126 : heap_page_items_state *inter_call_data = NULL;
134 : FuncCallContext *fctx;
135 : int raw_page_size;
136 :
137 126 : if (!superuser())
138 0 : ereport(ERROR,
139 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
140 : errmsg("must be superuser to use raw page functions")));
141 :
142 126 : raw_page_size = VARSIZE(raw_page) - VARHDRSZ;
143 :
144 126 : if (SRF_IS_FIRSTCALL())
145 : {
146 : TupleDesc tupdesc;
147 : MemoryContext mctx;
148 :
149 20 : if (raw_page_size < SizeOfPageHeaderData)
150 0 : ereport(ERROR,
151 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
152 : errmsg("input page too small (%d bytes)", raw_page_size)));
153 :
154 20 : fctx = SRF_FIRSTCALL_INIT();
155 20 : mctx = MemoryContextSwitchTo(fctx->multi_call_memory_ctx);
156 :
157 20 : inter_call_data = palloc(sizeof(heap_page_items_state));
158 :
159 : /* Build a tuple descriptor for our result type */
160 20 : if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
161 0 : elog(ERROR, "return type must be a row type");
162 :
163 20 : inter_call_data->tupd = tupdesc;
164 :
165 20 : inter_call_data->offset = FirstOffsetNumber;
166 20 : inter_call_data->page = VARDATA(raw_page);
167 :
168 20 : fctx->max_calls = PageGetMaxOffsetNumber(inter_call_data->page);
169 20 : fctx->user_fctx = inter_call_data;
170 :
171 20 : MemoryContextSwitchTo(mctx);
172 : }
173 :
174 126 : fctx = SRF_PERCALL_SETUP();
175 126 : inter_call_data = fctx->user_fctx;
176 :
177 126 : if (fctx->call_cntr < fctx->max_calls)
178 : {
179 106 : 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 :
189 106 : memset(nulls, 0, sizeof(nulls));
190 :
191 : /* Extract information from the line pointer */
192 :
193 106 : id = PageGetItemId(page, inter_call_data->offset);
194 :
195 106 : lp_offset = ItemIdGetOffset(id);
196 106 : lp_flags = ItemIdGetFlags(id);
197 106 : lp_len = ItemIdGetLength(id);
198 :
199 106 : values[0] = UInt16GetDatum(inter_call_data->offset);
200 106 : values[1] = UInt16GetDatum(lp_offset);
201 106 : values[2] = UInt16GetDatum(lp_flags);
202 106 : 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 : */
209 106 : if (ItemIdHasStorage(id) &&
210 96 : lp_len >= MinHeapTupleSize &&
211 96 : lp_offset == MAXALIGN(lp_offset) &&
212 96 : lp_offset + lp_len <= raw_page_size)
213 96 : {
214 : HeapTupleHeader tuphdr;
215 : bytea *tuple_data_bytea;
216 : int tuple_data_len;
217 :
218 : /* Extract information from the tuple header */
219 :
220 96 : tuphdr = (HeapTupleHeader) PageGetItem(page, id);
221 :
222 96 : values[4] = UInt32GetDatum(HeapTupleHeaderGetRawXmin(tuphdr));
223 96 : values[5] = UInt32GetDatum(HeapTupleHeaderGetRawXmax(tuphdr));
224 : /* shared with xvac */
225 96 : values[6] = UInt32GetDatum(HeapTupleHeaderGetRawCommandId(tuphdr));
226 96 : values[7] = PointerGetDatum(&tuphdr->t_ctid);
227 96 : values[8] = UInt32GetDatum(tuphdr->t_infomask2);
228 96 : values[9] = UInt32GetDatum(tuphdr->t_infomask);
229 96 : values[10] = UInt8GetDatum(tuphdr->t_hoff);
230 :
231 : /* Copy raw tuple data into bytea attribute */
232 96 : tuple_data_len = lp_len - tuphdr->t_hoff;
233 96 : tuple_data_bytea = (bytea *) palloc(tuple_data_len + VARHDRSZ);
234 96 : SET_VARSIZE(tuple_data_bytea, tuple_data_len + VARHDRSZ);
235 96 : memcpy(VARDATA(tuple_data_bytea), (char *) tuphdr + tuphdr->t_hoff,
236 : tuple_data_len);
237 96 : 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 96 : if (tuphdr->t_hoff >= SizeofHeapTupleHeader &&
246 96 : tuphdr->t_hoff <= lp_len &&
247 96 : tuphdr->t_hoff == MAXALIGN(tuphdr->t_hoff))
248 : {
249 96 : if (tuphdr->t_infomask & HEAP_HASNULL)
250 : {
251 : int bits_len;
252 :
253 8 : bits_len =
254 8 : BITMAPLEN(HeapTupleHeaderGetNatts(tuphdr)) * BITS_PER_BYTE;
255 8 : values[11] = CStringGetTextDatum(bits_to_text(tuphdr->t_bits, bits_len));
256 : }
257 : else
258 88 : nulls[11] = true;
259 :
260 96 : if (tuphdr->t_infomask & HEAP_HASOID_OLD)
261 0 : values[12] = HeapTupleHeaderGetOidOld(tuphdr);
262 : else
263 96 : nulls[12] = true;
264 : }
265 : else
266 : {
267 0 : nulls[11] = true;
268 0 : 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 :
279 110 : for (i = 4; i <= 13; i++)
280 100 : nulls[i] = true;
281 : }
282 :
283 : /* Build and return the result tuple. */
284 106 : resultTuple = heap_form_tuple(inter_call_data->tupd, values, nulls);
285 106 : result = HeapTupleGetDatum(resultTuple);
286 :
287 106 : inter_call_data->offset++;
288 :
289 106 : SRF_RETURN_NEXT(fctx, result);
290 : }
291 : else
292 20 : 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 10 : 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 10 : int off = 0;
313 : Relation rel;
314 : TupleDesc tupdesc;
315 :
316 : /* Get tuple descriptor from relation OID */
317 10 : rel = relation_open(relid, AccessShareLock);
318 10 : tupdesc = RelationGetDescr(rel);
319 :
320 10 : raw_attrs = initArrayResult(BYTEAOID, CurrentMemoryContext, false);
321 10 : nattrs = tupdesc->natts;
322 :
323 : /*
324 : * Sequences always use heap AM, but they don't show that in the catalogs.
325 : */
326 10 : if (rel->rd_rel->relkind != RELKIND_SEQUENCE &&
327 8 : rel->rd_rel->relam != HEAP_TABLE_AM_OID)
328 0 : ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
329 : errmsg("only heap AM is supported")));
330 :
331 10 : if (nattrs < (t_infomask2 & HEAP_NATTS_MASK))
332 0 : ereport(ERROR,
333 : (errcode(ERRCODE_DATA_CORRUPTED),
334 : errmsg("number of attributes in tuple header is greater than number of attributes in tuple descriptor")));
335 :
336 44 : for (i = 0; i < nattrs; i++)
337 : {
338 : CompactAttribute *attr;
339 : bool is_null;
340 34 : bytea *attr_data = NULL;
341 :
342 34 : attr = TupleDescCompactAttr(tupdesc, i);
343 :
344 : /*
345 : * Tuple header can specify fewer attributes than tuple descriptor as
346 : * ALTER TABLE ADD COLUMN without DEFAULT keyword does not actually
347 : * change tuples in pages, so attributes with numbers greater than
348 : * (t_infomask2 & HEAP_NATTS_MASK) should be treated as NULL.
349 : */
350 34 : if (i >= (t_infomask2 & HEAP_NATTS_MASK))
351 0 : is_null = true;
352 : else
353 34 : is_null = (t_infomask & HEAP_HASNULL) && att_isnull(i, t_bits);
354 :
355 34 : if (!is_null)
356 : {
357 : int len;
358 :
359 20 : if (attr->attlen == -1)
360 : {
361 0 : off = att_pointer_alignby(off, attr->attalignby, -1,
362 : tupdata + off);
363 :
364 : /*
365 : * As VARSIZE_ANY throws an exception if it can't properly
366 : * detect the type of external storage in macros VARTAG_SIZE,
367 : * this check is repeated to have a nicer error handling.
368 : */
369 0 : if (VARATT_IS_EXTERNAL(tupdata + off) &&
370 0 : !VARATT_IS_EXTERNAL_ONDISK(tupdata + off) &&
371 0 : !VARATT_IS_EXTERNAL_INDIRECT(tupdata + off))
372 0 : ereport(ERROR,
373 : (errcode(ERRCODE_DATA_CORRUPTED),
374 : errmsg("first byte of varlena attribute is incorrect for attribute %d", i)));
375 :
376 0 : len = VARSIZE_ANY(tupdata + off);
377 : }
378 : else
379 : {
380 20 : off = att_nominal_alignby(off, attr->attalignby);
381 20 : len = attr->attlen;
382 : }
383 :
384 20 : if (tupdata_len < off + len)
385 0 : ereport(ERROR,
386 : (errcode(ERRCODE_DATA_CORRUPTED),
387 : errmsg("unexpected end of tuple data")));
388 :
389 20 : if (attr->attlen == -1 && do_detoast)
390 0 : attr_data = pg_detoast_datum_copy((struct varlena *) (tupdata + off));
391 : else
392 : {
393 20 : attr_data = (bytea *) palloc(len + VARHDRSZ);
394 20 : SET_VARSIZE(attr_data, len + VARHDRSZ);
395 20 : memcpy(VARDATA(attr_data), tupdata + off, len);
396 : }
397 :
398 20 : off = att_addlength_pointer(off, attr->attlen,
399 : tupdata + off);
400 : }
401 :
402 34 : raw_attrs = accumArrayResult(raw_attrs, PointerGetDatum(attr_data),
403 : is_null, BYTEAOID, CurrentMemoryContext);
404 34 : if (attr_data)
405 20 : pfree(attr_data);
406 : }
407 :
408 10 : if (tupdata_len != off)
409 0 : ereport(ERROR,
410 : (errcode(ERRCODE_DATA_CORRUPTED),
411 : errmsg("end of tuple reached without looking at all its data")));
412 :
413 10 : relation_close(rel, AccessShareLock);
414 :
415 10 : return makeArrayResult(raw_attrs, CurrentMemoryContext);
416 : }
417 :
418 : /*
419 : * tuple_data_split
420 : *
421 : * Split raw tuple data taken directly from page into distinct elements
422 : * taking into account null values.
423 : */
424 26 : PG_FUNCTION_INFO_V1(tuple_data_split);
425 :
426 : Datum
427 10 : tuple_data_split(PG_FUNCTION_ARGS)
428 : {
429 : Oid relid;
430 : bytea *raw_data;
431 : uint16 t_infomask;
432 : uint16 t_infomask2;
433 : char *t_bits_str;
434 10 : bool do_detoast = false;
435 10 : bits8 *t_bits = NULL;
436 : Datum res;
437 :
438 10 : relid = PG_GETARG_OID(0);
439 10 : raw_data = PG_ARGISNULL(1) ? NULL : PG_GETARG_BYTEA_P(1);
440 10 : t_infomask = PG_GETARG_INT16(2);
441 10 : t_infomask2 = PG_GETARG_INT16(3);
442 10 : t_bits_str = PG_ARGISNULL(4) ? NULL :
443 4 : text_to_cstring(PG_GETARG_TEXT_PP(4));
444 :
445 10 : if (PG_NARGS() >= 6)
446 0 : do_detoast = PG_GETARG_BOOL(5);
447 :
448 10 : if (!superuser())
449 0 : ereport(ERROR,
450 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
451 : errmsg("must be superuser to use raw page functions")));
452 :
453 10 : if (!raw_data)
454 0 : PG_RETURN_NULL();
455 :
456 : /*
457 : * Convert t_bits string back to the bits8 array as represented in the
458 : * tuple header.
459 : */
460 10 : if (t_infomask & HEAP_HASNULL)
461 : {
462 : size_t bits_str_len;
463 : size_t bits_len;
464 :
465 4 : bits_len = BITMAPLEN(t_infomask2 & HEAP_NATTS_MASK) * BITS_PER_BYTE;
466 4 : if (!t_bits_str)
467 0 : ereport(ERROR,
468 : (errcode(ERRCODE_DATA_CORRUPTED),
469 : errmsg("t_bits string must not be NULL")));
470 :
471 4 : bits_str_len = strlen(t_bits_str);
472 4 : if (bits_len != bits_str_len)
473 0 : ereport(ERROR,
474 : (errcode(ERRCODE_DATA_CORRUPTED),
475 : errmsg("unexpected length of t_bits string: %zu, expected %zu",
476 : bits_str_len, bits_len)));
477 :
478 : /* do the conversion */
479 4 : t_bits = text_to_bits(t_bits_str, bits_str_len);
480 : }
481 : else
482 : {
483 6 : if (t_bits_str)
484 0 : ereport(ERROR,
485 : (errcode(ERRCODE_DATA_CORRUPTED),
486 : errmsg("t_bits string is expected to be NULL, but instead it is %zu bytes long",
487 : strlen(t_bits_str))));
488 : }
489 :
490 : /* Split tuple data */
491 10 : res = tuple_data_split_internal(relid, (char *) raw_data + VARHDRSZ,
492 10 : VARSIZE(raw_data) - VARHDRSZ,
493 : t_infomask, t_infomask2, t_bits,
494 : do_detoast);
495 :
496 10 : if (t_bits)
497 4 : pfree(t_bits);
498 :
499 10 : PG_RETURN_DATUM(res);
500 : }
501 :
502 : /*
503 : * heap_tuple_infomask_flags
504 : *
505 : * Decode into a human-readable format t_infomask and t_infomask2 associated
506 : * to a tuple. All the flags are described in access/htup_details.h.
507 : */
508 14 : PG_FUNCTION_INFO_V1(heap_tuple_infomask_flags);
509 :
510 : Datum
511 22 : heap_tuple_infomask_flags(PG_FUNCTION_ARGS)
512 : {
513 : #define HEAP_TUPLE_INFOMASK_COLS 2
514 22 : Datum values[HEAP_TUPLE_INFOMASK_COLS] = {0};
515 22 : bool nulls[HEAP_TUPLE_INFOMASK_COLS] = {0};
516 22 : uint16 t_infomask = PG_GETARG_INT16(0);
517 22 : uint16 t_infomask2 = PG_GETARG_INT16(1);
518 22 : int cnt = 0;
519 : ArrayType *a;
520 : int bitcnt;
521 : Datum *flags;
522 : TupleDesc tupdesc;
523 : HeapTuple tuple;
524 :
525 22 : if (!superuser())
526 0 : ereport(ERROR,
527 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
528 : errmsg("must be superuser to use raw page functions")));
529 :
530 : /* Build a tuple descriptor for our result type */
531 22 : if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
532 0 : elog(ERROR, "return type must be a row type");
533 :
534 22 : bitcnt = pg_popcount((const char *) &t_infomask, sizeof(uint16)) +
535 22 : pg_popcount((const char *) &t_infomask2, sizeof(uint16));
536 :
537 : /* If no flags, return a set of empty arrays */
538 22 : if (bitcnt <= 0)
539 : {
540 2 : values[0] = PointerGetDatum(construct_empty_array(TEXTOID));
541 2 : values[1] = PointerGetDatum(construct_empty_array(TEXTOID));
542 2 : tuple = heap_form_tuple(tupdesc, values, nulls);
543 2 : PG_RETURN_DATUM(HeapTupleGetDatum(tuple));
544 : }
545 :
546 : /* build set of raw flags */
547 20 : flags = (Datum *) palloc0(sizeof(Datum) * bitcnt);
548 :
549 : /* decode t_infomask */
550 20 : if ((t_infomask & HEAP_HASNULL) != 0)
551 6 : flags[cnt++] = CStringGetTextDatum("HEAP_HASNULL");
552 20 : if ((t_infomask & HEAP_HASVARWIDTH) != 0)
553 4 : flags[cnt++] = CStringGetTextDatum("HEAP_HASVARWIDTH");
554 20 : if ((t_infomask & HEAP_HASEXTERNAL) != 0)
555 4 : flags[cnt++] = CStringGetTextDatum("HEAP_HASEXTERNAL");
556 20 : if ((t_infomask & HEAP_HASOID_OLD) != 0)
557 4 : flags[cnt++] = CStringGetTextDatum("HEAP_HASOID_OLD");
558 20 : if ((t_infomask & HEAP_XMAX_KEYSHR_LOCK) != 0)
559 8 : flags[cnt++] = CStringGetTextDatum("HEAP_XMAX_KEYSHR_LOCK");
560 20 : if ((t_infomask & HEAP_COMBOCID) != 0)
561 4 : flags[cnt++] = CStringGetTextDatum("HEAP_COMBOCID");
562 20 : if ((t_infomask & HEAP_XMAX_EXCL_LOCK) != 0)
563 6 : flags[cnt++] = CStringGetTextDatum("HEAP_XMAX_EXCL_LOCK");
564 20 : if ((t_infomask & HEAP_XMAX_LOCK_ONLY) != 0)
565 4 : flags[cnt++] = CStringGetTextDatum("HEAP_XMAX_LOCK_ONLY");
566 20 : if ((t_infomask & HEAP_XMIN_COMMITTED) != 0)
567 8 : flags[cnt++] = CStringGetTextDatum("HEAP_XMIN_COMMITTED");
568 20 : if ((t_infomask & HEAP_XMIN_INVALID) != 0)
569 8 : flags[cnt++] = CStringGetTextDatum("HEAP_XMIN_INVALID");
570 20 : if ((t_infomask & HEAP_XMAX_COMMITTED) != 0)
571 4 : flags[cnt++] = CStringGetTextDatum("HEAP_XMAX_COMMITTED");
572 20 : if ((t_infomask & HEAP_XMAX_INVALID) != 0)
573 10 : flags[cnt++] = CStringGetTextDatum("HEAP_XMAX_INVALID");
574 20 : if ((t_infomask & HEAP_XMAX_IS_MULTI) != 0)
575 4 : flags[cnt++] = CStringGetTextDatum("HEAP_XMAX_IS_MULTI");
576 20 : if ((t_infomask & HEAP_UPDATED) != 0)
577 4 : flags[cnt++] = CStringGetTextDatum("HEAP_UPDATED");
578 20 : if ((t_infomask & HEAP_MOVED_OFF) != 0)
579 8 : flags[cnt++] = CStringGetTextDatum("HEAP_MOVED_OFF");
580 20 : if ((t_infomask & HEAP_MOVED_IN) != 0)
581 8 : flags[cnt++] = CStringGetTextDatum("HEAP_MOVED_IN");
582 :
583 : /* decode t_infomask2 */
584 20 : if ((t_infomask2 & HEAP_KEYS_UPDATED) != 0)
585 4 : flags[cnt++] = CStringGetTextDatum("HEAP_KEYS_UPDATED");
586 20 : if ((t_infomask2 & HEAP_HOT_UPDATED) != 0)
587 4 : flags[cnt++] = CStringGetTextDatum("HEAP_HOT_UPDATED");
588 20 : if ((t_infomask2 & HEAP_ONLY_TUPLE) != 0)
589 4 : flags[cnt++] = CStringGetTextDatum("HEAP_ONLY_TUPLE");
590 :
591 : /* build value */
592 : Assert(cnt <= bitcnt);
593 20 : a = construct_array_builtin(flags, cnt, TEXTOID);
594 20 : 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 20 : cnt = 0;
601 184 : MemSet(flags, 0, sizeof(Datum) * bitcnt);
602 :
603 : /* decode combined masks of t_infomask */
604 20 : if ((t_infomask & HEAP_XMAX_SHR_LOCK) == HEAP_XMAX_SHR_LOCK)
605 6 : flags[cnt++] = CStringGetTextDatum("HEAP_XMAX_SHR_LOCK");
606 20 : if ((t_infomask & HEAP_XMIN_FROZEN) == HEAP_XMIN_FROZEN)
607 8 : flags[cnt++] = CStringGetTextDatum("HEAP_XMIN_FROZEN");
608 20 : if ((t_infomask & HEAP_MOVED) == HEAP_MOVED)
609 8 : flags[cnt++] = CStringGetTextDatum("HEAP_MOVED");
610 :
611 : /* Build an empty array if there are no combined flags */
612 20 : if (cnt == 0)
613 6 : a = construct_empty_array(TEXTOID);
614 : else
615 14 : a = construct_array_builtin(flags, cnt, TEXTOID);
616 20 : pfree(flags);
617 20 : values[1] = PointerGetDatum(a);
618 :
619 : /* Returns the record as Datum */
620 20 : tuple = heap_form_tuple(tupdesc, values, nulls);
621 20 : PG_RETURN_DATUM(HeapTupleGetDatum(tuple));
622 : }
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