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Centralize definition of integer limits.

Browse source 
Several submitted and even committed patches have run into the problem
that C89, our baseline, does not provide minimum/maximum values for
various integer datatypes. C99's stdint.h does, but we can't rely on
it.

Several parts of the code defined limits locally, so instead centralize
the definitions to c.h.

This patch also changes the more obvious usages of literal limit values;
there's more places that could be changed, but it's less clear whether
it's beneficial to change those.

Author: Andrew Gierth
Discussion: 87619tc5wc.fsf@news-spur.riddles.org.uk
This commit is contained in:
Andres Freund 2015-03-25 22:39:42 +01:00
parent bdc3d7fa23
commit 83ff1618bc
18 changed files with 68 additions and 36 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
contrib/btree_gist/btree_ts.c
View file

@ -153,7 +153,7 @@ ts_dist(PG_FUNCTION_ARGS)
p->day = INT_MAX;
p->month = INT_MAX;
#ifdef HAVE_INT64_TIMESTAMP
p->time = INT64CONST(0x7FFFFFFFFFFFFFFF);
p->time = INT64_MAX;
#else
p->time = DBL_MAX;
#endif
@ -181,7 +181,7 @@ tstz_dist(PG_FUNCTION_ARGS)
p->day = INT_MAX;
p->month = INT_MAX;
#ifdef HAVE_INT64_TIMESTAMP
p->time = INT64CONST(0x7FFFFFFFFFFFFFFF);
p->time = INT64_MAX;
#else
p->time = DBL_MAX;
#endif

4
contrib/intarray/_int_gist.c
View file

@ -3,6 +3,8 @@
*/
#include "postgres.h"
#include <limits.h>
#include "access/gist.h"
#include "access/skey.h"
@ -191,7 +193,7 @@ g_int_compress(PG_FUNCTION_ARGS)
cand = 1;
while (len > MAXNUMRANGE * 2)
{
min = 0x7fffffff;
min = INT_MAX;
for (i = 2; i < len; i += 2)
if (min > (dr[i] - dr[i - 1]))
{

6
contrib/pgbench/pgbench.c
View file

@ -49,10 +49,6 @@
#include <sys/resource.h> /* for getrlimit */
#endif
#ifndef INT64_MAX
#define INT64_MAX INT64CONST(0x7FFFFFFFFFFFFFFF)
#endif
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
@ -453,7 +449,7 @@ strtoint64(const char *str)
*/
if (strncmp(ptr, "9223372036854775808", 19) == 0)
{
result = -INT64CONST(0x7fffffffffffffff) - 1;
result = INT64_MIN;
ptr += 19;
goto gotdigits;
}

2
src/backend/access/transam/xlog.c
View file

@ -1408,7 +1408,7 @@ WALInsertLockAcquireExclusive(void)
{
LWLockAcquireWithVar(&WALInsertLocks[i].l.lock,
&WALInsertLocks[i].l.insertingAt,
UINT64CONST(0xFFFFFFFFFFFFFFFF));
UINT64_MAX);
}
LWLockAcquireWithVar(&WALInsertLocks[i].l.lock,
&WALInsertLocks[i].l.insertingAt,

6
src/backend/tsearch/wparser_def.c
View file

@ -14,6 +14,8 @@
#include "postgres.h"
#include <limits.h>
#include "catalog/pg_collation.h"
#include "commands/defrem.h"
#include "tsearch/ts_locale.h"
@ -2047,7 +2049,7 @@ hlCover(HeadlineParsedText *prs, TSQuery query, int *p, int *q)
int pos = *p;
*q = -1;
*p = 0x7fffffff;
*p = INT_MAX;
for (j = 0; j < query->size; j++)
{
@ -2258,7 +2260,7 @@ mark_hl_fragments(HeadlineParsedText *prs, TSQuery query, int highlight,
for (f = 0; f < max_fragments; f++)
{
maxitems = 0;
minwords = 0x7fffffff;
minwords = INT32_MAX;
minI = -1;
/*

2
src/backend/utils/adt/int8.c
View file

@ -78,7 +78,7 @@ scanint8(const char *str, bool errorOK, int64 *result)
*/
if (strncmp(ptr, "9223372036854775808", 19) == 0)
{
tmp = -INT64CONST(0x7fffffffffffffff) - 1;
tmp = INT64_MIN;
ptr += 19;
goto gotdigits;
}

2
src/backend/utils/adt/numutils.c
View file

@ -190,7 +190,7 @@ pg_lltoa(int64 value, char *a)
* Avoid problems with the most negative integer not being representable
* as a positive integer.
*/
if (value == (-INT64CONST(0x7FFFFFFFFFFFFFFF) - 1))
if (value == INT64_MIN)
{
memcpy(a, "-9223372036854775808", 21);
return;

8
src/backend/utils/adt/timestamp.c
View file

@ -44,14 +44,6 @@
#define SAMESIGN(a,b) (((a) < 0) == ((b) < 0))
#ifndef INT64_MAX
#define INT64_MAX INT64CONST(0x7FFFFFFFFFFFFFFF)
#endif
#ifndef INT64_MIN
#define INT64_MIN (-INT64CONST(0x7FFFFFFFFFFFFFFF) - 1)
#endif
/* Set at postmaster start */
TimestampTz PgStartTime;

3
src/backend/utils/adt/tsrank.c
View file

@ -13,6 +13,7 @@
*/
#include "postgres.h"
#include <limits.h>
#include <math.h>
#include "tsearch/ts_utils.h"
@ -555,7 +556,7 @@ Cover(DocRepresentation *doc, int len, QueryRepresentation *qr, CoverExt *ext)
memset(qr->operandexist, 0, sizeof(bool) * qr->query->size);
ext->p = 0x7fffffff;
ext->p = INT_MAX;
ext->q = 0;
ptr = doc + ext->pos;

2
src/backend/utils/adt/txid.c
View file

@ -34,7 +34,7 @@
/* txid will be signed int8 in database, so must limit to 63 bits */
#define MAX_TXID UINT64CONST(0x7FFFFFFFFFFFFFFF)
#define MAX_TXID ((uint64) INT64_MAX)
/* Use unsigned variant internally */
typedef uint64 txid;

41
src/include/c.h
View file

@ -249,6 +249,36 @@ typedef uint8 bits8; /* >= 8 bits */
typedef uint16 bits16; /* >= 16 bits */
typedef uint32 bits32; /* >= 32 bits */
/* should be defined in stdint.h, but we guarantee them here */
#ifndef INT8_MIN
#define INT8_MIN (-0x7F-1)
#endif
#ifndef INT8_MAX
#define INT8_MAX (0x7F)
#endif
#ifndef INT16_MIN
#define INT16_MIN (-0x7FFF-1)
#endif
#ifndef INT16_MAX
#define INT16_MAX (0x7FFF)
#endif
#ifndef INT32_MIN
#define INT32_MIN (-0x7FFFFFFF-1)
#endif
#ifndef INT32_MAX
#define INT32_MAX (0x7FFFFFFF)
#endif
#ifndef UINT8_MAX
#define UINT8_MAX (0xFF)
#endif
#ifndef UINT16_MAX
#define UINT16_MAX (0xFFFF)
#endif
#ifndef UINT32_MAX
#define UINT32_MAX (0xFFFFFFFF)
#endif
/*
* 64-bit integers
*/
@ -284,6 +314,17 @@ typedef unsigned long long int uint64;
#define UINT64CONST(x) ((uint64) x)
#endif
/* should be defined in stdint.h, but we guarantee them here */
#ifndef INT64_MIN
#define INT64_MIN (-INT64CONST(0x7FFFFFFFFFFFFFFF) - 1)
#endif
#ifndef INT64_MAX
#define INT64_MAX INT64CONST(0x7FFFFFFFFFFFFFFF)
#endif
#ifndef UINT64_MAX
#define UINT64_MAX UINT64CONST(0xFFFFFFFFFFFFFFFF)
#endif
/* snprintf format strings to use for 64-bit integers */
#define INT64_FORMAT "%" INT64_MODIFIER "d"
#define UINT64_FORMAT "%" INT64_MODIFIER "u"

4
src/include/datatype/timestamp.h
View file

@ -119,8 +119,8 @@ typedef struct
* DT_NOBEGIN represents timestamp -infinity; DT_NOEND represents +infinity
*/
#ifdef HAVE_INT64_TIMESTAMP
#define DT_NOBEGIN (-INT64CONST(0x7fffffffffffffff) - 1)
#define DT_NOEND (INT64CONST(0x7fffffffffffffff))
#define DT_NOBEGIN INT64_MIN
#define DT_NOEND INT64_MAX
#else /* !HAVE_INT64_TIMESTAMP */
#ifdef HUGE_VAL
#define DT_NOBEGIN (-HUGE_VAL)

2
src/include/executor/instrument.h
View file

@ -38,7 +38,7 @@ typedef enum InstrumentOption
INSTRUMENT_TIMER = 1 << 0, /* needs timer (and row counts) */
INSTRUMENT_BUFFERS = 1 << 1, /* needs buffer usage */
INSTRUMENT_ROWS = 1 << 2, /* needs row count */
INSTRUMENT_ALL = 0x7FFFFFFF
INSTRUMENT_ALL = INT32_MAX
} InstrumentOption;
typedef struct Instrumentation

2
src/include/nodes/parsenodes.h
View file

@ -587,7 +587,7 @@ typedef enum TableLikeOption
CREATE_TABLE_LIKE_INDEXES = 1 << 2,
CREATE_TABLE_LIKE_STORAGE = 1 << 3,
CREATE_TABLE_LIKE_COMMENTS = 1 << 4,
CREATE_TABLE_LIKE_ALL = 0x7FFFFFFF
CREATE_TABLE_LIKE_ALL = INT32_MAX
} TableLikeOption;
/*

4
src/include/pg_config_manual.h
View file

@ -48,7 +48,7 @@
/*
* Set the upper and lower bounds of sequence values.
*/
#define SEQ_MAXVALUE INT64CONST(0x7FFFFFFFFFFFFFFF)
#define SEQ_MAXVALUE INT64_MAX
#define SEQ_MINVALUE (-SEQ_MAXVALUE)
/*
@ -185,7 +185,7 @@
* the older rand() function, which is often different from --- and
* considerably inferior to --- random().
*/
#define MAX_RANDOM_VALUE (0x7FFFFFFF)
#define MAX_RANDOM_VALUE INT32_MAX
/*
* On PPC machines, decide whether to use the mutex hint bit in LWARX

4
src/include/port/atomics.h
View file

@ -489,7 +489,7 @@ STATIC_IF_INLINE uint64
pg_atomic_fetch_sub_u64(volatile pg_atomic_uint64 *ptr, int64 sub_)
{
AssertPointerAlignment(ptr, 8);
Assert(sub_ != -INT64CONST(0x7FFFFFFFFFFFFFFF) - 1);
Assert(sub_ != INT64_MIN);
return pg_atomic_fetch_sub_u64_impl(ptr, sub_);
}
@ -518,7 +518,7 @@ STATIC_IF_INLINE uint64
pg_atomic_sub_fetch_u64(volatile pg_atomic_uint64 *ptr, int64 sub_)
{
AssertPointerAlignment(ptr, 8);
Assert(sub_ != -INT64CONST(0x7FFFFFFFFFFFFFFF) - 1);
Assert(sub_ != INT64_MIN);
return pg_atomic_sub_fetch_u64_impl(ptr, sub_);
}

2
src/include/storage/predicate_internals.h
View file

@ -33,7 +33,7 @@ typedef uint64 SerCommitSeqNo;
* at that point. It's earlier than all normal sequence numbers,
* and is only used by recovered prepared transactions
*/
#define InvalidSerCommitSeqNo ((SerCommitSeqNo) UINT64CONST(0xFFFFFFFFFFFFFFFF))
#define InvalidSerCommitSeqNo ((SerCommitSeqNo) UINT64_MAX)
#define RecoverySerCommitSeqNo ((SerCommitSeqNo) 1)
#define FirstNormalSerCommitSeqNo ((SerCommitSeqNo) 2)

6
src/include/utils/date.h
View file

@ -35,11 +35,9 @@ typedef struct
/*
* Infinity and minus infinity must be the max and min values of DateADT.
* We could use INT_MIN and INT_MAX here, but seems better to not assume that
* int32 == int.
*/
#define DATEVAL_NOBEGIN ((DateADT) (-0x7fffffff - 1))
#define DATEVAL_NOEND ((DateADT) 0x7fffffff)
#define DATEVAL_NOBEGIN ((DateADT) INT32_MIN)
#define DATEVAL_NOEND ((DateADT) INT32_MAX)
#define DATE_NOBEGIN(j) ((j) = DATEVAL_NOBEGIN)
#define DATE_IS_NOBEGIN(j) ((j) == DATEVAL_NOBEGIN)