TLA 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) 2007-2023, 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 CBC 2 : bits_to_text(bits8 *bits, int len)
63 : {
64 : int i;
65 : char *str;
66 :
67 2 : str = palloc(len + 1);
68 :
69 18 : for (i = 0; i < len; i++)
70 16 : str[i] = (bits[(i / 8)] & (1 << (i % 8))) ? '1' : '0';
71 :
72 2 : str[i] = '\0';
73 :
74 2 : 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 1 : text_to_bits(char *str, int len)
86 : {
87 : bits8 *bits;
88 1 : int off = 0;
89 1 : char byte = 0;
90 :
91 1 : bits = palloc(len + 1);
92 :
93 9 : while (off < len)
94 : {
95 8 : if (off % 8 == 0)
96 1 : byte = 0;
97 :
98 8 : if ((str[off] == '0') || (str[off] == '1'))
99 8 : byte = byte | ((str[off] - '0') << off % 8);
100 : else
101 UBC 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 CBC 8 : if (off % 8 == 7)
107 1 : bits[off / 8] = byte;
108 :
109 8 : off++;
110 : }
111 :
112 1 : 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 8 : 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 53 : heap_page_items(PG_FUNCTION_ARGS)
131 : {
132 53 : bytea *raw_page = PG_GETARG_BYTEA_P(0);
133 53 : heap_page_items_state *inter_call_data = NULL;
134 : FuncCallContext *fctx;
135 : int raw_page_size;
136 :
137 53 : if (!superuser())
138 UBC 0 : ereport(ERROR,
139 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
140 : errmsg("must be superuser to use raw page functions")));
141 :
142 CBC 53 : raw_page_size = VARSIZE(raw_page) - VARHDRSZ;
143 :
144 53 : if (SRF_IS_FIRSTCALL())
145 : {
146 : TupleDesc tupdesc;
147 : MemoryContext mctx;
148 :
149 5 : if (raw_page_size < SizeOfPageHeaderData)
150 UBC 0 : ereport(ERROR,
151 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
152 : errmsg("input page too small (%d bytes)", raw_page_size)));
153 :
154 CBC 5 : fctx = SRF_FIRSTCALL_INIT();
155 5 : mctx = MemoryContextSwitchTo(fctx->multi_call_memory_ctx);
156 :
157 5 : inter_call_data = palloc(sizeof(heap_page_items_state));
158 :
159 : /* Build a tuple descriptor for our result type */
160 5 : if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
161 UBC 0 : elog(ERROR, "return type must be a row type");
162 :
163 CBC 5 : inter_call_data->tupd = tupdesc;
164 :
165 5 : inter_call_data->offset = FirstOffsetNumber;
166 5 : inter_call_data->page = VARDATA(raw_page);
167 :
168 5 : fctx->max_calls = PageGetMaxOffsetNumber(inter_call_data->page);
169 5 : fctx->user_fctx = inter_call_data;
170 :
171 5 : MemoryContextSwitchTo(mctx);
172 : }
173 :
174 53 : fctx = SRF_PERCALL_SETUP();
175 53 : inter_call_data = fctx->user_fctx;
176 :
177 53 : if (fctx->call_cntr < fctx->max_calls)
178 : {
179 48 : 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 48 : memset(nulls, 0, sizeof(nulls));
190 :
191 : /* Extract information from the line pointer */
192 :
193 48 : id = PageGetItemId(page, inter_call_data->offset);
194 :
195 48 : lp_offset = ItemIdGetOffset(id);
196 48 : lp_flags = ItemIdGetFlags(id);
197 48 : lp_len = ItemIdGetLength(id);
198 :
199 48 : values[0] = UInt16GetDatum(inter_call_data->offset);
200 48 : values[1] = UInt16GetDatum(lp_offset);
201 48 : values[2] = UInt16GetDatum(lp_flags);
202 48 : 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 48 : if (ItemIdHasStorage(id) &&
210 43 : lp_len >= MinHeapTupleSize &&
211 43 : lp_offset == MAXALIGN(lp_offset) &&
212 43 : lp_offset + lp_len <= raw_page_size)
213 43 : {
214 : HeapTupleHeader tuphdr;
215 : bytea *tuple_data_bytea;
216 : int tuple_data_len;
217 :
218 : /* Extract information from the tuple header */
219 :
220 43 : tuphdr = (HeapTupleHeader) PageGetItem(page, id);
221 :
222 43 : values[4] = UInt32GetDatum(HeapTupleHeaderGetRawXmin(tuphdr));
223 43 : values[5] = UInt32GetDatum(HeapTupleHeaderGetRawXmax(tuphdr));
224 : /* shared with xvac */
225 43 : values[6] = UInt32GetDatum(HeapTupleHeaderGetRawCommandId(tuphdr));
226 43 : values[7] = PointerGetDatum(&tuphdr->t_ctid);
227 43 : values[8] = UInt32GetDatum(tuphdr->t_infomask2);
228 43 : values[9] = UInt32GetDatum(tuphdr->t_infomask);
229 43 : values[10] = UInt8GetDatum(tuphdr->t_hoff);
230 :
231 : /* Copy raw tuple data into bytea attribute */
232 43 : tuple_data_len = lp_len - tuphdr->t_hoff;
233 43 : tuple_data_bytea = (bytea *) palloc(tuple_data_len + VARHDRSZ);
234 43 : SET_VARSIZE(tuple_data_bytea, tuple_data_len + VARHDRSZ);
235 43 : memcpy(VARDATA(tuple_data_bytea), (char *) tuphdr + tuphdr->t_hoff,
236 : tuple_data_len);
237 43 : 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 43 : if (tuphdr->t_hoff >= SizeofHeapTupleHeader &&
246 43 : tuphdr->t_hoff <= lp_len &&
247 43 : tuphdr->t_hoff == MAXALIGN(tuphdr->t_hoff))
248 : {
249 43 : if (tuphdr->t_infomask & HEAP_HASNULL)
250 : {
251 : int bits_len;
252 :
253 2 : bits_len =
254 2 : BITMAPLEN(HeapTupleHeaderGetNatts(tuphdr)) * BITS_PER_BYTE;
255 2 : values[11] = CStringGetTextDatum(bits_to_text(tuphdr->t_bits, bits_len));
256 : }
257 : else
258 41 : nulls[11] = true;
259 :
260 43 : if (tuphdr->t_infomask & HEAP_HASOID_OLD)
261 UBC 0 : values[12] = HeapTupleHeaderGetOidOld(tuphdr);
262 : else
263 CBC 43 : nulls[12] = true;
264 : }
265 : else
266 : {
267 UBC 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 CBC 55 : for (i = 4; i <= 13; i++)
280 50 : nulls[i] = true;
281 : }
282 :
283 : /* Build and return the result tuple. */
284 48 : resultTuple = heap_form_tuple(inter_call_data->tupd, values, nulls);
285 48 : result = HeapTupleGetDatum(resultTuple);
286 :
287 48 : inter_call_data->offset++;
288 :
289 48 : SRF_RETURN_NEXT(fctx, result);
290 : }
291 : else
292 5 : 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 2 : 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 2 : int off = 0;
313 : Relation rel;
314 : TupleDesc tupdesc;
315 :
316 : /* Get tuple descriptor from relation OID */
317 2 : rel = relation_open(relid, AccessShareLock);
318 2 : tupdesc = RelationGetDescr(rel);
319 :
320 2 : raw_attrs = initArrayResult(BYTEAOID, CurrentMemoryContext, false);
321 2 : nattrs = tupdesc->natts;
322 :
323 2 : if (rel->rd_rel->relam != HEAP_TABLE_AM_OID)
324 UBC 0 : ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
325 : errmsg("only heap AM is supported")));
326 :
327 CBC 2 : if (nattrs < (t_infomask2 & HEAP_NATTS_MASK))
328 UBC 0 : ereport(ERROR,
329 : (errcode(ERRCODE_DATA_CORRUPTED),
330 : errmsg("number of attributes in tuple header is greater than number of attributes in tuple descriptor")));
331 :
332 CBC 12 : for (i = 0; i < nattrs; i++)
333 : {
334 : Form_pg_attribute attr;
335 : bool is_null;
336 10 : bytea *attr_data = NULL;
337 :
338 10 : attr = TupleDescAttr(tupdesc, i);
339 :
340 : /*
341 : * Tuple header can specify fewer 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 10 : if (i >= (t_infomask2 & HEAP_NATTS_MASK))
347 UBC 0 : is_null = true;
348 : else
349 CBC 10 : is_null = (t_infomask & HEAP_HASNULL) && att_isnull(i, t_bits);
350 :
351 10 : if (!is_null)
352 : {
353 : int len;
354 :
355 4 : if (attr->attlen == -1)
356 : {
357 UBC 0 : 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 0 : if (VARATT_IS_EXTERNAL(tupdata + off) &&
366 0 : !VARATT_IS_EXTERNAL_ONDISK(tupdata + off) &&
367 0 : !VARATT_IS_EXTERNAL_INDIRECT(tupdata + off))
368 0 : ereport(ERROR,
369 : (errcode(ERRCODE_DATA_CORRUPTED),
370 : errmsg("first byte of varlena attribute is incorrect for attribute %d", i)));
371 :
372 0 : len = VARSIZE_ANY(tupdata + off);
373 : }
374 : else
375 : {
376 CBC 4 : off = att_align_nominal(off, attr->attalign);
377 4 : len = attr->attlen;
378 : }
379 :
380 4 : if (tupdata_len < off + len)
381 UBC 0 : ereport(ERROR,
382 : (errcode(ERRCODE_DATA_CORRUPTED),
383 : errmsg("unexpected end of tuple data")));
384 :
385 CBC 4 : if (attr->attlen == -1 && do_detoast)
386 UNC 0 : attr_data = pg_detoast_datum_copy((struct varlena *) (tupdata + off));
387 : else
388 : {
389 CBC 4 : attr_data = (bytea *) palloc(len + VARHDRSZ);
390 4 : SET_VARSIZE(attr_data, len + VARHDRSZ);
391 4 : memcpy(VARDATA(attr_data), tupdata + off, len);
392 : }
393 :
394 4 : off = att_addlength_pointer(off, attr->attlen,
395 : tupdata + off);
396 : }
397 :
398 10 : raw_attrs = accumArrayResult(raw_attrs, PointerGetDatum(attr_data),
399 : is_null, BYTEAOID, CurrentMemoryContext);
400 10 : if (attr_data)
401 4 : pfree(attr_data);
402 : }
403 :
404 2 : if (tupdata_len != off)
405 UBC 0 : ereport(ERROR,
406 : (errcode(ERRCODE_DATA_CORRUPTED),
407 : errmsg("end of tuple reached without looking at all its data")));
408 :
409 CBC 2 : relation_close(rel, AccessShareLock);
410 :
411 2 : 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 : */
420 13 : PG_FUNCTION_INFO_V1(tuple_data_split);
421 :
422 : Datum
423 2 : tuple_data_split(PG_FUNCTION_ARGS)
424 : {
425 : Oid relid;
426 : bytea *raw_data;
427 : uint16 t_infomask;
428 : uint16 t_infomask2;
429 : char *t_bits_str;
430 2 : bool do_detoast = false;
431 2 : bits8 *t_bits = NULL;
432 : Datum res;
433 :
434 2 : relid = PG_GETARG_OID(0);
435 2 : raw_data = PG_ARGISNULL(1) ? NULL : PG_GETARG_BYTEA_P(1);
436 2 : t_infomask = PG_GETARG_INT16(2);
437 2 : t_infomask2 = PG_GETARG_INT16(3);
438 2 : t_bits_str = PG_ARGISNULL(4) ? NULL :
439 1 : text_to_cstring(PG_GETARG_TEXT_PP(4));
440 :
441 2 : if (PG_NARGS() >= 6)
442 UBC 0 : do_detoast = PG_GETARG_BOOL(5);
443 :
444 CBC 2 : if (!superuser())
445 UBC 0 : ereport(ERROR,
446 : (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
447 : errmsg("must be superuser to use raw page functions")));
448 :
449 CBC 2 : if (!raw_data)
450 UBC 0 : PG_RETURN_NULL();
451 :
452 : /*
453 : * Convert t_bits string back to the bits8 array as represented in the
454 : * tuple header.
455 : */
456 CBC 2 : if (t_infomask & HEAP_HASNULL)
457 : {
458 : size_t bits_str_len;
459 : size_t bits_len;
460 :
461 1 : bits_len = BITMAPLEN(t_infomask2 & HEAP_NATTS_MASK) * BITS_PER_BYTE;
462 1 : if (!t_bits_str)
463 UBC 0 : ereport(ERROR,
464 : (errcode(ERRCODE_DATA_CORRUPTED),
465 : errmsg("t_bits string must not be NULL")));
466 :
467 CBC 1 : bits_str_len = strlen(t_bits_str);
468 1 : if (bits_len != bits_str_len)
469 UBC 0 : ereport(ERROR,
470 : (errcode(ERRCODE_DATA_CORRUPTED),
471 : errmsg("unexpected length of t_bits string: %zu, expected %zu",
472 : bits_str_len, bits_len)));
473 :
474 : /* do the conversion */
475 CBC 1 : t_bits = text_to_bits(t_bits_str, bits_str_len);
476 : }
477 : else
478 : {
479 1 : if (t_bits_str)
480 UBC 0 : ereport(ERROR,
481 : (errcode(ERRCODE_DATA_CORRUPTED),
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 CBC 2 : res = tuple_data_split_internal(relid, (char *) raw_data + VARHDRSZ,
488 2 : VARSIZE(raw_data) - VARHDRSZ,
489 : t_infomask, t_infomask2, t_bits,
490 : do_detoast);
491 :
492 2 : if (t_bits)
493 1 : pfree(t_bits);
494 :
495 GNC 2 : PG_RETURN_DATUM(res);
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 : */
504 CBC 7 : PG_FUNCTION_INFO_V1(heap_tuple_infomask_flags);
505 :
506 : Datum
507 9 : heap_tuple_infomask_flags(PG_FUNCTION_ARGS)
508 : {
509 : #define HEAP_TUPLE_INFOMASK_COLS 2
510 GNC 9 : Datum values[HEAP_TUPLE_INFOMASK_COLS] = {0};
511 9 : bool nulls[HEAP_TUPLE_INFOMASK_COLS] = {0};
512 CBC 9 : uint16 t_infomask = PG_GETARG_INT16(0);
513 9 : uint16 t_infomask2 = PG_GETARG_INT16(1);
514 9 : int cnt = 0;
515 : ArrayType *a;
516 : int bitcnt;
517 : Datum *flags;
518 : TupleDesc tupdesc;
519 : HeapTuple tuple;
520 :
521 9 : if (!superuser())
522 UBC 0 : 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 CBC 9 : if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
528 UBC 0 : elog(ERROR, "return type must be a row type");
529 :
530 CBC 9 : bitcnt = pg_popcount((const char *) &t_infomask, sizeof(uint16)) +
531 9 : pg_popcount((const char *) &t_infomask2, sizeof(uint16));
532 :
533 ECB : /* If no flags, return a set of empty arrays */
534 CBC 9 : if (bitcnt <= 0)
535 ECB : {
536 GIC 1 : values[0] = PointerGetDatum(construct_empty_array(TEXTOID));
537 1 : values[1] = PointerGetDatum(construct_empty_array(TEXTOID));
538 1 : tuple = heap_form_tuple(tupdesc, values, nulls);
539 CBC 1 : PG_RETURN_DATUM(HeapTupleGetDatum(tuple));
540 : }
541 :
542 ECB : /* build set of raw flags */
543 CBC 8 : flags = (Datum *) palloc0(sizeof(Datum) * bitcnt);
544 ECB :
545 : /* decode t_infomask */
546 CBC 8 : if ((t_infomask & HEAP_HASNULL) != 0)
547 2 : flags[cnt++] = CStringGetTextDatum("HEAP_HASNULL");
548 8 : if ((t_infomask & HEAP_HASVARWIDTH) != 0)
549 2 : flags[cnt++] = CStringGetTextDatum("HEAP_HASVARWIDTH");
550 8 : if ((t_infomask & HEAP_HASEXTERNAL) != 0)
551 2 : flags[cnt++] = CStringGetTextDatum("HEAP_HASEXTERNAL");
552 8 : if ((t_infomask & HEAP_HASOID_OLD) != 0)
553 2 : flags[cnt++] = CStringGetTextDatum("HEAP_HASOID_OLD");
554 8 : if ((t_infomask & HEAP_XMAX_KEYSHR_LOCK) != 0)
555 4 : flags[cnt++] = CStringGetTextDatum("HEAP_XMAX_KEYSHR_LOCK");
556 8 : if ((t_infomask & HEAP_COMBOCID) != 0)
557 2 : flags[cnt++] = CStringGetTextDatum("HEAP_COMBOCID");
558 8 : if ((t_infomask & HEAP_XMAX_EXCL_LOCK) != 0)
559 3 : flags[cnt++] = CStringGetTextDatum("HEAP_XMAX_EXCL_LOCK");
560 8 : if ((t_infomask & HEAP_XMAX_LOCK_ONLY) != 0)
561 2 : flags[cnt++] = CStringGetTextDatum("HEAP_XMAX_LOCK_ONLY");
562 8 : if ((t_infomask & HEAP_XMIN_COMMITTED) != 0)
563 4 : flags[cnt++] = CStringGetTextDatum("HEAP_XMIN_COMMITTED");
564 8 : if ((t_infomask & HEAP_XMIN_INVALID) != 0)
565 4 : flags[cnt++] = CStringGetTextDatum("HEAP_XMIN_INVALID");
566 8 : if ((t_infomask & HEAP_XMAX_COMMITTED) != 0)
567 2 : flags[cnt++] = CStringGetTextDatum("HEAP_XMAX_COMMITTED");
568 8 : if ((t_infomask & HEAP_XMAX_INVALID) != 0)
569 3 : flags[cnt++] = CStringGetTextDatum("HEAP_XMAX_INVALID");
570 8 : if ((t_infomask & HEAP_XMAX_IS_MULTI) != 0)
571 2 : flags[cnt++] = CStringGetTextDatum("HEAP_XMAX_IS_MULTI");
572 8 : if ((t_infomask & HEAP_UPDATED) != 0)
573 2 : flags[cnt++] = CStringGetTextDatum("HEAP_UPDATED");
574 GIC 8 : if ((t_infomask & HEAP_MOVED_OFF) != 0)
575 4 : flags[cnt++] = CStringGetTextDatum("HEAP_MOVED_OFF");
576 CBC 8 : if ((t_infomask & HEAP_MOVED_IN) != 0)
577 4 : flags[cnt++] = CStringGetTextDatum("HEAP_MOVED_IN");
578 ECB :
579 : /* decode t_infomask2 */
580 CBC 8 : if ((t_infomask2 & HEAP_KEYS_UPDATED) != 0)
581 2 : flags[cnt++] = CStringGetTextDatum("HEAP_KEYS_UPDATED");
582 GIC 8 : if ((t_infomask2 & HEAP_HOT_UPDATED) != 0)
583 2 : flags[cnt++] = CStringGetTextDatum("HEAP_HOT_UPDATED");
584 CBC 8 : if ((t_infomask2 & HEAP_ONLY_TUPLE) != 0)
585 2 : flags[cnt++] = CStringGetTextDatum("HEAP_ONLY_TUPLE");
586 ECB :
587 : /* build value */
588 GIC 8 : Assert(cnt <= bitcnt);
589 GNC 8 : a = construct_array_builtin(flags, cnt, TEXTOID);
590 GIC 8 : values[0] = PointerGetDatum(a);
591 :
592 ECB : /*
593 : * Build set of combined flags. Use the same array as previously, this
594 : * keeps the code simple.
595 : */
596 CBC 8 : cnt = 0;
597 85 : MemSet(flags, 0, sizeof(Datum) * bitcnt);
598 ECB :
599 : /* decode combined masks of t_infomask */
600 CBC 8 : if ((t_infomask & HEAP_XMAX_SHR_LOCK) == HEAP_XMAX_SHR_LOCK)
601 3 : flags[cnt++] = CStringGetTextDatum("HEAP_XMAX_SHR_LOCK");
602 GIC 8 : if ((t_infomask & HEAP_XMIN_FROZEN) == HEAP_XMIN_FROZEN)
603 4 : flags[cnt++] = CStringGetTextDatum("HEAP_XMIN_FROZEN");
604 CBC 8 : if ((t_infomask & HEAP_MOVED) == HEAP_MOVED)
605 4 : flags[cnt++] = CStringGetTextDatum("HEAP_MOVED");
606 :
607 ECB : /* Build an empty array if there are no combined flags */
608 CBC 8 : if (cnt == 0)
609 1 : a = construct_empty_array(TEXTOID);
610 : else
611 GNC 7 : a = construct_array_builtin(flags, cnt, TEXTOID);
612 CBC 8 : pfree(flags);
613 8 : values[1] = PointerGetDatum(a);
614 :
615 : /* Returns the record as Datum */
616 GIC 8 : tuple = heap_form_tuple(tupdesc, values, nulls);
617 8 : PG_RETURN_DATUM(HeapTupleGetDatum(tuple));
618 : }
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