LCOV - code coverage report
Current view: top level - contrib/pageinspect - heapfuncs.c (source / functions) Hit Total Coverage
Test: PostgreSQL 17devel Lines: 211 238 88.7 %
Date: 2024-03-28 15:11:36 Functions: 9 9 100.0 %
Legend: Lines: hit not hit

          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) 2007-2024, 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           4 : bits_to_text(bits8 *bits, int len)
      63             : {
      64             :     int         i;
      65             :     char       *str;
      66             : 
      67           4 :     str = palloc(len + 1);
      68             : 
      69          36 :     for (i = 0; i < len; i++)
      70          32 :         str[i] = (bits[(i / 8)] & (1 << (i % 8))) ? '1' : '0';
      71             : 
      72           4 :     str[i] = '\0';
      73             : 
      74           4 :     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           2 : text_to_bits(char *str, int len)
      86             : {
      87             :     bits8      *bits;
      88           2 :     int         off = 0;
      89           2 :     char        byte = 0;
      90             : 
      91           2 :     bits = palloc(len + 1);
      92             : 
      93          18 :     while (off < len)
      94             :     {
      95          16 :         if (off % 8 == 0)
      96           2 :             byte = 0;
      97             : 
      98          16 :         if ((str[off] == '0') || (str[off] == '1'))
      99          16 :             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          16 :         if (off % 8 == 7)
     107           2 :             bits[off / 8] = byte;
     108             : 
     109          16 :         off++;
     110             :     }
     111             : 
     112           2 :     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         106 : heap_page_items(PG_FUNCTION_ARGS)
     131             : {
     132         106 :     bytea      *raw_page = PG_GETARG_BYTEA_P(0);
     133         106 :     heap_page_items_state *inter_call_data = NULL;
     134             :     FuncCallContext *fctx;
     135             :     int         raw_page_size;
     136             : 
     137         106 :     if (!superuser())
     138           0 :         ereport(ERROR,
     139             :                 (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
     140             :                  errmsg("must be superuser to use raw page functions")));
     141             : 
     142         106 :     raw_page_size = VARSIZE(raw_page) - VARHDRSZ;
     143             : 
     144         106 :     if (SRF_IS_FIRSTCALL())
     145             :     {
     146             :         TupleDesc   tupdesc;
     147             :         MemoryContext mctx;
     148             : 
     149          10 :         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          10 :         fctx = SRF_FIRSTCALL_INIT();
     155          10 :         mctx = MemoryContextSwitchTo(fctx->multi_call_memory_ctx);
     156             : 
     157          10 :         inter_call_data = palloc(sizeof(heap_page_items_state));
     158             : 
     159             :         /* Build a tuple descriptor for our result type */
     160          10 :         if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
     161           0 :             elog(ERROR, "return type must be a row type");
     162             : 
     163          10 :         inter_call_data->tupd = tupdesc;
     164             : 
     165          10 :         inter_call_data->offset = FirstOffsetNumber;
     166          10 :         inter_call_data->page = VARDATA(raw_page);
     167             : 
     168          10 :         fctx->max_calls = PageGetMaxOffsetNumber(inter_call_data->page);
     169          10 :         fctx->user_fctx = inter_call_data;
     170             : 
     171          10 :         MemoryContextSwitchTo(mctx);
     172             :     }
     173             : 
     174         106 :     fctx = SRF_PERCALL_SETUP();
     175         106 :     inter_call_data = fctx->user_fctx;
     176             : 
     177         106 :     if (fctx->call_cntr < fctx->max_calls)
     178             :     {
     179          96 :         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          96 :         memset(nulls, 0, sizeof(nulls));
     190             : 
     191             :         /* Extract information from the line pointer */
     192             : 
     193          96 :         id = PageGetItemId(page, inter_call_data->offset);
     194             : 
     195          96 :         lp_offset = ItemIdGetOffset(id);
     196          96 :         lp_flags = ItemIdGetFlags(id);
     197          96 :         lp_len = ItemIdGetLength(id);
     198             : 
     199          96 :         values[0] = UInt16GetDatum(inter_call_data->offset);
     200          96 :         values[1] = UInt16GetDatum(lp_offset);
     201          96 :         values[2] = UInt16GetDatum(lp_flags);
     202          96 :         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          96 :         if (ItemIdHasStorage(id) &&
     210          86 :             lp_len >= MinHeapTupleSize &&
     211          86 :             lp_offset == MAXALIGN(lp_offset) &&
     212          86 :             lp_offset + lp_len <= raw_page_size)
     213          86 :         {
     214             :             HeapTupleHeader tuphdr;
     215             :             bytea      *tuple_data_bytea;
     216             :             int         tuple_data_len;
     217             : 
     218             :             /* Extract information from the tuple header */
     219             : 
     220          86 :             tuphdr = (HeapTupleHeader) PageGetItem(page, id);
     221             : 
     222          86 :             values[4] = UInt32GetDatum(HeapTupleHeaderGetRawXmin(tuphdr));
     223          86 :             values[5] = UInt32GetDatum(HeapTupleHeaderGetRawXmax(tuphdr));
     224             :             /* shared with xvac */
     225          86 :             values[6] = UInt32GetDatum(HeapTupleHeaderGetRawCommandId(tuphdr));
     226          86 :             values[7] = PointerGetDatum(&tuphdr->t_ctid);
     227          86 :             values[8] = UInt32GetDatum(tuphdr->t_infomask2);
     228          86 :             values[9] = UInt32GetDatum(tuphdr->t_infomask);
     229          86 :             values[10] = UInt8GetDatum(tuphdr->t_hoff);
     230             : 
     231             :             /* Copy raw tuple data into bytea attribute */
     232          86 :             tuple_data_len = lp_len - tuphdr->t_hoff;
     233          86 :             tuple_data_bytea = (bytea *) palloc(tuple_data_len + VARHDRSZ);
     234          86 :             SET_VARSIZE(tuple_data_bytea, tuple_data_len + VARHDRSZ);
     235          86 :             memcpy(VARDATA(tuple_data_bytea), (char *) tuphdr + tuphdr->t_hoff,
     236             :                    tuple_data_len);
     237          86 :             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          86 :             if (tuphdr->t_hoff >= SizeofHeapTupleHeader &&
     246          86 :                 tuphdr->t_hoff <= lp_len &&
     247          86 :                 tuphdr->t_hoff == MAXALIGN(tuphdr->t_hoff))
     248             :             {
     249          86 :                 if (tuphdr->t_infomask & HEAP_HASNULL)
     250             :                 {
     251             :                     int         bits_len;
     252             : 
     253           4 :                     bits_len =
     254           4 :                         BITMAPLEN(HeapTupleHeaderGetNatts(tuphdr)) * BITS_PER_BYTE;
     255           4 :                     values[11] = CStringGetTextDatum(bits_to_text(tuphdr->t_bits, bits_len));
     256             :                 }
     257             :                 else
     258          82 :                     nulls[11] = true;
     259             : 
     260          86 :                 if (tuphdr->t_infomask & HEAP_HASOID_OLD)
     261           0 :                     values[12] = HeapTupleHeaderGetOidOld(tuphdr);
     262             :                 else
     263          86 :                     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          96 :         resultTuple = heap_form_tuple(inter_call_data->tupd, values, nulls);
     285          96 :         result = HeapTupleGetDatum(resultTuple);
     286             : 
     287          96 :         inter_call_data->offset++;
     288             : 
     289          96 :         SRF_RETURN_NEXT(fctx, result);
     290             :     }
     291             :     else
     292          10 :         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           4 : 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           4 :     int         off = 0;
     313             :     Relation    rel;
     314             :     TupleDesc   tupdesc;
     315             : 
     316             :     /* Get tuple descriptor from relation OID */
     317           4 :     rel = relation_open(relid, AccessShareLock);
     318           4 :     tupdesc = RelationGetDescr(rel);
     319             : 
     320           4 :     raw_attrs = initArrayResult(BYTEAOID, CurrentMemoryContext, false);
     321           4 :     nattrs = tupdesc->natts;
     322             : 
     323           4 :     if (rel->rd_rel->relam != HEAP_TABLE_AM_OID)
     324           0 :         ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
     325             :                         errmsg("only heap AM is supported")));
     326             : 
     327           4 :     if (nattrs < (t_infomask2 & HEAP_NATTS_MASK))
     328           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          24 :     for (i = 0; i < nattrs; i++)
     333             :     {
     334             :         Form_pg_attribute attr;
     335             :         bool        is_null;
     336          20 :         bytea      *attr_data = NULL;
     337             : 
     338          20 :         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          20 :         if (i >= (t_infomask2 & HEAP_NATTS_MASK))
     347           0 :             is_null = true;
     348             :         else
     349          20 :             is_null = (t_infomask & HEAP_HASNULL) && att_isnull(i, t_bits);
     350             : 
     351          20 :         if (!is_null)
     352             :         {
     353             :             int         len;
     354             : 
     355           8 :             if (attr->attlen == -1)
     356             :             {
     357           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           8 :                 off = att_align_nominal(off, attr->attalign);
     377           8 :                 len = attr->attlen;
     378             :             }
     379             : 
     380           8 :             if (tupdata_len < off + len)
     381           0 :                 ereport(ERROR,
     382             :                         (errcode(ERRCODE_DATA_CORRUPTED),
     383             :                          errmsg("unexpected end of tuple data")));
     384             : 
     385           8 :             if (attr->attlen == -1 && do_detoast)
     386           0 :                 attr_data = pg_detoast_datum_copy((struct varlena *) (tupdata + off));
     387             :             else
     388             :             {
     389           8 :                 attr_data = (bytea *) palloc(len + VARHDRSZ);
     390           8 :                 SET_VARSIZE(attr_data, len + VARHDRSZ);
     391           8 :                 memcpy(VARDATA(attr_data), tupdata + off, len);
     392             :             }
     393             : 
     394           8 :             off = att_addlength_pointer(off, attr->attlen,
     395             :                                         tupdata + off);
     396             :         }
     397             : 
     398          20 :         raw_attrs = accumArrayResult(raw_attrs, PointerGetDatum(attr_data),
     399             :                                      is_null, BYTEAOID, CurrentMemoryContext);
     400          20 :         if (attr_data)
     401           8 :             pfree(attr_data);
     402             :     }
     403             : 
     404           4 :     if (tupdata_len != off)
     405           0 :         ereport(ERROR,
     406             :                 (errcode(ERRCODE_DATA_CORRUPTED),
     407             :                  errmsg("end of tuple reached without looking at all its data")));
     408             : 
     409           4 :     relation_close(rel, AccessShareLock);
     410             : 
     411           4 :     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          26 : PG_FUNCTION_INFO_V1(tuple_data_split);
     421             : 
     422             : Datum
     423           4 : 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           4 :     bool        do_detoast = false;
     431           4 :     bits8      *t_bits = NULL;
     432             :     Datum       res;
     433             : 
     434           4 :     relid = PG_GETARG_OID(0);
     435           4 :     raw_data = PG_ARGISNULL(1) ? NULL : PG_GETARG_BYTEA_P(1);
     436           4 :     t_infomask = PG_GETARG_INT16(2);
     437           4 :     t_infomask2 = PG_GETARG_INT16(3);
     438           4 :     t_bits_str = PG_ARGISNULL(4) ? NULL :
     439           2 :         text_to_cstring(PG_GETARG_TEXT_PP(4));
     440             : 
     441           4 :     if (PG_NARGS() >= 6)
     442           0 :         do_detoast = PG_GETARG_BOOL(5);
     443             : 
     444           4 :     if (!superuser())
     445           0 :         ereport(ERROR,
     446             :                 (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
     447             :                  errmsg("must be superuser to use raw page functions")));
     448             : 
     449           4 :     if (!raw_data)
     450           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           4 :     if (t_infomask & HEAP_HASNULL)
     457             :     {
     458             :         size_t      bits_str_len;
     459             :         size_t      bits_len;
     460             : 
     461           2 :         bits_len = BITMAPLEN(t_infomask2 & HEAP_NATTS_MASK) * BITS_PER_BYTE;
     462           2 :         if (!t_bits_str)
     463           0 :             ereport(ERROR,
     464             :                     (errcode(ERRCODE_DATA_CORRUPTED),
     465             :                      errmsg("t_bits string must not be NULL")));
     466             : 
     467           2 :         bits_str_len = strlen(t_bits_str);
     468           2 :         if (bits_len != bits_str_len)
     469           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           2 :         t_bits = text_to_bits(t_bits_str, bits_str_len);
     476             :     }
     477             :     else
     478             :     {
     479           2 :         if (t_bits_str)
     480           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           4 :     res = tuple_data_split_internal(relid, (char *) raw_data + VARHDRSZ,
     488           4 :                                     VARSIZE(raw_data) - VARHDRSZ,
     489             :                                     t_infomask, t_infomask2, t_bits,
     490             :                                     do_detoast);
     491             : 
     492           4 :     if (t_bits)
     493           2 :         pfree(t_bits);
     494             : 
     495           4 :     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          14 : PG_FUNCTION_INFO_V1(heap_tuple_infomask_flags);
     505             : 
     506             : Datum
     507          18 : heap_tuple_infomask_flags(PG_FUNCTION_ARGS)
     508             : {
     509             : #define HEAP_TUPLE_INFOMASK_COLS 2
     510          18 :     Datum       values[HEAP_TUPLE_INFOMASK_COLS] = {0};
     511          18 :     bool        nulls[HEAP_TUPLE_INFOMASK_COLS] = {0};
     512          18 :     uint16      t_infomask = PG_GETARG_INT16(0);
     513          18 :     uint16      t_infomask2 = PG_GETARG_INT16(1);
     514          18 :     int         cnt = 0;
     515             :     ArrayType  *a;
     516             :     int         bitcnt;
     517             :     Datum      *flags;
     518             :     TupleDesc   tupdesc;
     519             :     HeapTuple   tuple;
     520             : 
     521          18 :     if (!superuser())
     522           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          18 :     if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
     528           0 :         elog(ERROR, "return type must be a row type");
     529             : 
     530          18 :     bitcnt = pg_popcount((const char *) &t_infomask, sizeof(uint16)) +
     531          18 :         pg_popcount((const char *) &t_infomask2, sizeof(uint16));
     532             : 
     533             :     /* If no flags, return a set of empty arrays */
     534          18 :     if (bitcnt <= 0)
     535             :     {
     536           2 :         values[0] = PointerGetDatum(construct_empty_array(TEXTOID));
     537           2 :         values[1] = PointerGetDatum(construct_empty_array(TEXTOID));
     538           2 :         tuple = heap_form_tuple(tupdesc, values, nulls);
     539           2 :         PG_RETURN_DATUM(HeapTupleGetDatum(tuple));
     540             :     }
     541             : 
     542             :     /* build set of raw flags */
     543          16 :     flags = (Datum *) palloc0(sizeof(Datum) * bitcnt);
     544             : 
     545             :     /* decode t_infomask */
     546          16 :     if ((t_infomask & HEAP_HASNULL) != 0)
     547           4 :         flags[cnt++] = CStringGetTextDatum("HEAP_HASNULL");
     548          16 :     if ((t_infomask & HEAP_HASVARWIDTH) != 0)
     549           4 :         flags[cnt++] = CStringGetTextDatum("HEAP_HASVARWIDTH");
     550          16 :     if ((t_infomask & HEAP_HASEXTERNAL) != 0)
     551           4 :         flags[cnt++] = CStringGetTextDatum("HEAP_HASEXTERNAL");
     552          16 :     if ((t_infomask & HEAP_HASOID_OLD) != 0)
     553           4 :         flags[cnt++] = CStringGetTextDatum("HEAP_HASOID_OLD");
     554          16 :     if ((t_infomask & HEAP_XMAX_KEYSHR_LOCK) != 0)
     555           8 :         flags[cnt++] = CStringGetTextDatum("HEAP_XMAX_KEYSHR_LOCK");
     556          16 :     if ((t_infomask & HEAP_COMBOCID) != 0)
     557           4 :         flags[cnt++] = CStringGetTextDatum("HEAP_COMBOCID");
     558          16 :     if ((t_infomask & HEAP_XMAX_EXCL_LOCK) != 0)
     559           6 :         flags[cnt++] = CStringGetTextDatum("HEAP_XMAX_EXCL_LOCK");
     560          16 :     if ((t_infomask & HEAP_XMAX_LOCK_ONLY) != 0)
     561           4 :         flags[cnt++] = CStringGetTextDatum("HEAP_XMAX_LOCK_ONLY");
     562          16 :     if ((t_infomask & HEAP_XMIN_COMMITTED) != 0)
     563           8 :         flags[cnt++] = CStringGetTextDatum("HEAP_XMIN_COMMITTED");
     564          16 :     if ((t_infomask & HEAP_XMIN_INVALID) != 0)
     565           8 :         flags[cnt++] = CStringGetTextDatum("HEAP_XMIN_INVALID");
     566          16 :     if ((t_infomask & HEAP_XMAX_COMMITTED) != 0)
     567           4 :         flags[cnt++] = CStringGetTextDatum("HEAP_XMAX_COMMITTED");
     568          16 :     if ((t_infomask & HEAP_XMAX_INVALID) != 0)
     569           6 :         flags[cnt++] = CStringGetTextDatum("HEAP_XMAX_INVALID");
     570          16 :     if ((t_infomask & HEAP_XMAX_IS_MULTI) != 0)
     571           4 :         flags[cnt++] = CStringGetTextDatum("HEAP_XMAX_IS_MULTI");
     572          16 :     if ((t_infomask & HEAP_UPDATED) != 0)
     573           4 :         flags[cnt++] = CStringGetTextDatum("HEAP_UPDATED");
     574          16 :     if ((t_infomask & HEAP_MOVED_OFF) != 0)
     575           8 :         flags[cnt++] = CStringGetTextDatum("HEAP_MOVED_OFF");
     576          16 :     if ((t_infomask & HEAP_MOVED_IN) != 0)
     577           8 :         flags[cnt++] = CStringGetTextDatum("HEAP_MOVED_IN");
     578             : 
     579             :     /* decode t_infomask2 */
     580          16 :     if ((t_infomask2 & HEAP_KEYS_UPDATED) != 0)
     581           4 :         flags[cnt++] = CStringGetTextDatum("HEAP_KEYS_UPDATED");
     582          16 :     if ((t_infomask2 & HEAP_HOT_UPDATED) != 0)
     583           4 :         flags[cnt++] = CStringGetTextDatum("HEAP_HOT_UPDATED");
     584          16 :     if ((t_infomask2 & HEAP_ONLY_TUPLE) != 0)
     585           4 :         flags[cnt++] = CStringGetTextDatum("HEAP_ONLY_TUPLE");
     586             : 
     587             :     /* build value */
     588             :     Assert(cnt <= bitcnt);
     589          16 :     a = construct_array_builtin(flags, cnt, TEXTOID);
     590          16 :     values[0] = PointerGetDatum(a);
     591             : 
     592             :     /*
     593             :      * Build set of combined flags.  Use the same array as previously, this
     594             :      * keeps the code simple.
     595             :      */
     596          16 :     cnt = 0;
     597         170 :     MemSet(flags, 0, sizeof(Datum) * bitcnt);
     598             : 
     599             :     /* decode combined masks of t_infomask */
     600          16 :     if ((t_infomask & HEAP_XMAX_SHR_LOCK) == HEAP_XMAX_SHR_LOCK)
     601           6 :         flags[cnt++] = CStringGetTextDatum("HEAP_XMAX_SHR_LOCK");
     602          16 :     if ((t_infomask & HEAP_XMIN_FROZEN) == HEAP_XMIN_FROZEN)
     603           8 :         flags[cnt++] = CStringGetTextDatum("HEAP_XMIN_FROZEN");
     604          16 :     if ((t_infomask & HEAP_MOVED) == HEAP_MOVED)
     605           8 :         flags[cnt++] = CStringGetTextDatum("HEAP_MOVED");
     606             : 
     607             :     /* Build an empty array if there are no combined flags */
     608          16 :     if (cnt == 0)
     609           2 :         a = construct_empty_array(TEXTOID);
     610             :     else
     611          14 :         a = construct_array_builtin(flags, cnt, TEXTOID);
     612          16 :     pfree(flags);
     613          16 :     values[1] = PointerGetDatum(a);
     614             : 
     615             :     /* Returns the record as Datum */
     616          16 :     tuple = heap_form_tuple(tupdesc, values, nulls);
     617          16 :     PG_RETURN_DATUM(HeapTupleGetDatum(tuple));
     618             : }

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