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itemptr.c File Reference

#include "postgres.h"
#include "storage/itemptr.h"

Include dependency graph for itemptr.c:

Go to the source code of this file.

Functions

StaticAssertDecl (sizeof(ItemPointerData)==3 *sizeof(uint16), "ItemPointerData struct is improperly padded")

bool ItemPointerEquals (ItemPointer pointer1, ItemPointer pointer2)

int32 ItemPointerCompare (ItemPointer arg1, ItemPointer arg2)

void ItemPointerInc (ItemPointer pointer)

void ItemPointerDec (ItemPointer pointer)

Function Documentation

◆ ItemPointerCompare()

int32 ItemPointerCompare ( ItemPointer arg1,

ItemPointer arg2

)

Definition at line 51 of file itemptr.c.

52{

53 /*

54 * Use ItemPointerGet{Offset,Block}NumberNoCheck to avoid asserting

55 * ip_posid != 0, which may not be true for a user-supplied TID.

56 */

57 BlockNumber b1 = ItemPointerGetBlockNumberNoCheck(arg1);

58 BlockNumber b2 = ItemPointerGetBlockNumberNoCheck(arg2);

59

60 if (b1 < b2)

61 return -1;

62 else if (b1 > b2)

63 return 1;

64 else if (ItemPointerGetOffsetNumberNoCheck(arg1) <

65 ItemPointerGetOffsetNumberNoCheck(arg2))

66 return -1;

67 else if (ItemPointerGetOffsetNumberNoCheck(arg1) >

68 ItemPointerGetOffsetNumberNoCheck(arg2))

69 return 1;

70 else

71 return 0;

72}

BlockNumber

uint32 BlockNumber

Definition: block.h:31

ItemPointerGetOffsetNumberNoCheck

static OffsetNumber ItemPointerGetOffsetNumberNoCheck(const ItemPointerData *pointer)

Definition: itemptr.h:114

ItemPointerGetBlockNumberNoCheck

static BlockNumber ItemPointerGetBlockNumberNoCheck(const ItemPointerData *pointer)

Definition: itemptr.h:93

References ItemPointerGetBlockNumberNoCheck(), and ItemPointerGetOffsetNumberNoCheck().

Referenced by _bt_binsrch_posting(), _bt_check_unique(), _bt_compare(), _bt_delitems_delete_check(), _bt_load(), _bt_split(), _bt_swap_posting(), _bt_truncate(), _gin_compare_tuples(), AssertCheckItemPointers(), brin_minmax_multi_distance_tid(), bt_target_page_check(), bttidcmp(), dataBeginPlaceToPageLeaf(), gin_check_posting_tree_parent_keys_consistency(), GinBufferStoreTuple(), ginBuildCallbackParallel(), heap_getnextslot_tidrange(), heap_set_tidrange(), heapam_index_validate_scan(), tidcmp(), tideq(), tidge(), tidgt(), tidlarger(), tidle(), tidlt(), tidne(), TidRangeEval(), TidRangeRecheck(), and tidsmaller().

◆ ItemPointerDec()

void ItemPointerDec ( ItemPointer pointer )

Definition at line 114 of file itemptr.c.

115{

116 BlockNumber blk = ItemPointerGetBlockNumberNoCheck(pointer);

117 OffsetNumber off = ItemPointerGetOffsetNumberNoCheck(pointer);

118

119 if (off == 0)

120 {

121 if (blk != 0)

122 {

123 off = PG_UINT16_MAX;

124 blk--;

125 }

126 }

127 else

128 off--;

129

130 ItemPointerSet(pointer, blk, off);

131}

PG_UINT16_MAX

#define PG_UINT16_MAX

Definition: c.h:592

ItemPointerSet

static void ItemPointerSet(ItemPointerData *pointer, BlockNumber blockNumber, OffsetNumber offNum)

Definition: itemptr.h:135

OffsetNumber

uint16 OffsetNumber

Definition: off.h:24

References ItemPointerGetBlockNumberNoCheck(), ItemPointerGetOffsetNumberNoCheck(), ItemPointerSet(), and PG_UINT16_MAX.

Referenced by TidRangeEval().

◆ ItemPointerEquals()

bool ItemPointerEquals ( ItemPointer pointer1,

ItemPointer pointer2

)

Definition at line 35 of file itemptr.c.

36{

37 if (ItemPointerGetBlockNumber(pointer1) ==

38 ItemPointerGetBlockNumber(pointer2) &&

39 ItemPointerGetOffsetNumber(pointer1) ==

40 ItemPointerGetOffsetNumber(pointer2))

41 return true;

42 else

43 return false;

44}

ItemPointerGetOffsetNumber

static OffsetNumber ItemPointerGetOffsetNumber(const ItemPointerData *pointer)

Definition: itemptr.h:124

ItemPointerGetBlockNumber

static BlockNumber ItemPointerGetBlockNumber(const ItemPointerData *pointer)

Definition: itemptr.h:103

References ItemPointerGetBlockNumber(), and ItemPointerGetOffsetNumber().

Referenced by _bt_delitems_delete_check(), _bt_killitems(), _hash_kill_items(), brinGetTupleForHeapBlock(), cached_function_compile(), check_exclusion_or_unique_constraint(), collectMatchesForHeapRow(), compile_pltcl_function(), gin_check_posting_tree_parent_keys_consistency(), gistplacetopage(), heap_delete(), heap_get_latest_tid(), heap_inplace_update_and_unlock(), heap_lock_tuple(), heap_lock_updated_tuple(), heap_lock_updated_tuple_rec(), heap_update(), heapam_tuple_lock(), HeapTupleSatisfiesUpdate(), index_getnext_slot(), lookup_C_func(), PLy_procedure_valid(), processPendingPage(), rewrite_heap_tuple(), scanGetCandidate(), SearchCatCacheList(), SearchSysCacheLocked1(), spgAddPendingTID(), test_itemptr_pair(), test_lockmode_for_conflict(), and validate_plperl_function().

◆ ItemPointerInc()

void ItemPointerInc ( ItemPointer pointer )

Definition at line 84 of file itemptr.c.

85{

86 BlockNumber blk = ItemPointerGetBlockNumberNoCheck(pointer);

87 OffsetNumber off = ItemPointerGetOffsetNumberNoCheck(pointer);

88

89 if (off == PG_UINT16_MAX)

90 {

91 if (blk != InvalidBlockNumber)

92 {

93 off = 0;

94 blk++;

95 }

96 }

97 else

98 off++;

99

100 ItemPointerSet(pointer, blk, off);

101}

InvalidBlockNumber

#define InvalidBlockNumber

Definition: block.h:33

References InvalidBlockNumber, ItemPointerGetBlockNumberNoCheck(), ItemPointerGetOffsetNumberNoCheck(), ItemPointerSet(), and PG_UINT16_MAX.

Referenced by TidRangeEval().

◆ StaticAssertDecl()

StaticAssertDecl ( sizeof(ItemPointerData) = =3 *sizeof(uint16),

"ItemPointerData struct is improperly padded"

)