Get rid of a bunch of #ifdef HAVE_INT64_TIMESTAMP conditionals by inventing

a new typedef TimeOffset to represent an intermediate time value.  It's
either int64 or double as appropriate, and in most usages will be measured
in microseconds or seconds the same as Timestamp.  We don't call it
Timestamp, though, since the value doesn't necessarily represent an absolute
time instant.

Warren Turkal

src/backend/utils/adt/date.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/adt/date.c,v 1.139 2008/02/17 02:09:28 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/adt/date.c,v 1.140 2008/03/21 01:31:42 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1838,9 +1838,9 @@ timetztypmodout(PG_FUNCTION_ARGS)
 static int
 timetz2tm(TimeTzADT *time, struct pg_tm * tm, fsec_t *fsec, int *tzp)
 {
-#ifdef HAVE_INT64_TIMESTAMP
-	int64		trem = time->time;
+	TimeOffset	trem = time->time;
 
+#ifdef HAVE_INT64_TIMESTAMP
 	tm->tm_hour = trem / USECS_PER_HOUR;
 	trem -= tm->tm_hour * USECS_PER_HOUR;
 	tm->tm_min = trem / USECS_PER_MINUTE;
@@ -1848,8 +1848,6 @@ timetz2tm(TimeTzADT *time, struct pg_tm * tm, fsec_t *fsec, int *tzp)
 	tm->tm_sec = trem / USECS_PER_SEC;
 	*fsec = trem - tm->tm_sec * USECS_PER_SEC;
 #else
-	double		trem = time->time;
-
 recalc:
 	TMODULO(trem, tm->tm_hour, (double) SECS_PER_HOUR);
 	TMODULO(trem, tm->tm_min, (double) SECS_PER_MINUTE);
@@ -1895,17 +1893,14 @@ timetz_scale(PG_FUNCTION_ARGS)
 static int
 timetz_cmp_internal(TimeTzADT *time1, TimeTzADT *time2)
 {
-	/* Primary sort is by true (GMT-equivalent) time */
-#ifdef HAVE_INT64_TIMESTAMP
-	int64		t1,
+	TimeOffset	t1,
 				t2;
 
+	/* Primary sort is by true (GMT-equivalent) time */
+#ifdef HAVE_INT64_TIMESTAMP
 	t1 = time1->time + (time1->zone * USECS_PER_SEC);
 	t2 = time2->time + (time2->zone * USECS_PER_SEC);
 #else
-	double		t1,
-				t2;
-
 	t1 = time1->time + time1->zone;
 	t2 = time2->time + time2->zone;
 #endif

src/backend/utils/adt/nabstime.c

@@ -10,7 +10,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/adt/nabstime.c,v 1.153 2008/02/17 02:09:28 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/adt/nabstime.c,v 1.154 2008/03/21 01:31:42 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -831,12 +831,7 @@ interval_reltime(PG_FUNCTION_ARGS)
 	int			year,
 				month,
 				day;
-
-#ifdef HAVE_INT64_TIMESTAMP
-	int64		span;
-#else
-	double		span;
-#endif
+	TimeOffset	span;
 
 	year = interval->month / MONTHS_PER_YEAR;
 	month = interval->month % MONTHS_PER_YEAR;

src/backend/utils/adt/timestamp.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.185 2008/02/17 02:09:28 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.186 2008/03/21 01:31:42 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -44,11 +44,7 @@
 TimestampTz PgStartTime;
 
 
-#ifdef HAVE_INT64_TIMESTAMP
-static int64 time2t(const int hour, const int min, const int sec, const fsec_t fsec);
-#else
-static double time2t(const int hour, const int min, const int sec, const fsec_t fsec);
-#endif
+static TimeOffset time2t(const int hour, const int min, const int sec, const fsec_t fsec);
 static int	EncodeSpecialTimestamp(Timestamp dt, char *str);
 static Timestamp dt2local(Timestamp dt, int timezone);
 static void AdjustTimestampForTypmod(Timestamp *time, int32 typmod);
@@ -977,11 +973,7 @@ AdjustIntervalForTypmod(Interval *interval, int32 typmod)
 		}
 		else if (range == INTERVAL_MASK(MINUTE))
 		{
-#ifdef HAVE_INT64_TIMESTAMP
-			int64		hour;
-#else
-			double		hour;
-#endif
+			TimeOffset	hour;
 
 			interval->month = 0;
 			interval->day = 0;
@@ -998,11 +990,7 @@ AdjustIntervalForTypmod(Interval *interval, int32 typmod)
 		}
 		else if (range == INTERVAL_MASK(SECOND))
 		{
-#ifdef HAVE_INT64_TIMESTAMP
-			int64		minute;
-#else
-			double		minute;
-#endif
+			TimeOffset	minute;
 
 			interval->month = 0;
 			interval->day = 0;
@@ -1076,11 +1064,7 @@ AdjustIntervalForTypmod(Interval *interval, int32 typmod)
 		else if (range == (INTERVAL_MASK(MINUTE) |
 						   INTERVAL_MASK(SECOND)))
 		{
-#ifdef HAVE_INT64_TIMESTAMP
-			int64		hour;
-#else
-			double		hour;
-#endif
+			TimeOffset	hour;
 
 			interval->month = 0;
 			interval->day = 0;
@@ -1342,11 +1326,7 @@ timestamptz_to_str(TimestampTz t)
 void
 dt2time(Timestamp jd, int *hour, int *min, int *sec, fsec_t *fsec)
 {
-#ifdef HAVE_INT64_TIMESTAMP
-	int64		time;
-#else
-	double		time;
-#endif
+	TimeOffset	time;
 
 	time = jd;
 
@@ -1547,13 +1527,8 @@ recalc_t:
 int
 tm2timestamp(struct pg_tm * tm, fsec_t fsec, int *tzp, Timestamp *result)
 {
-#ifdef HAVE_INT64_TIMESTAMP
-	int			date;
-	int64		time;
-#else
-	double		date,
-				time;
-#endif
+	TimeOffset	date;
+	TimeOffset	time;
 
 	/* Julian day routines are not correct for negative Julian days */
 	if (!IS_VALID_JULIAN(tm->tm_year, tm->tm_mon, tm->tm_mday))
@@ -1596,13 +1571,8 @@ tm2timestamp(struct pg_tm * tm, fsec_t fsec, int *tzp, Timestamp *result)
 int
 interval2tm(Interval span, struct pg_tm * tm, fsec_t *fsec)
 {
-#ifdef HAVE_INT64_TIMESTAMP
-	int64		time;
-	int64		tfrac;
-#else
-	double		time;
-	double		tfrac;
-#endif
+	TimeOffset	time;
+	TimeOffset	tfrac;
 
 	tm->tm_year = span.month / MONTHS_PER_YEAR;
 	tm->tm_mon = span.month % MONTHS_PER_YEAR;
@@ -1658,19 +1628,15 @@ tm2interval(struct pg_tm * tm, fsec_t fsec, Interval *span)
 	return 0;
 }
 
-#ifdef HAVE_INT64_TIMESTAMP
-static int64
+static TimeOffset
 time2t(const int hour, const int min, const int sec, const fsec_t fsec)
 {
+#ifdef HAVE_INT64_TIMESTAMP
 	return (((((hour * MINS_PER_HOUR) + min) * SECS_PER_MINUTE) + sec) * USECS_PER_SEC) + fsec;
-}	/* time2t() */
 #else
-static double
-time2t(const int hour, const int min, const int sec, const fsec_t fsec)
-{
 	return (((hour * MINS_PER_HOUR) + min) * SECS_PER_MINUTE) + sec + fsec;
-}	/* time2t() */
 #endif
+}
 
 static Timestamp
 dt2local(Timestamp dt, int tz)
@@ -1681,7 +1647,7 @@ dt2local(Timestamp dt, int tz)
 	dt -= tz;
 #endif
 	return dt;
-}	/* dt2local() */
+}
 
 
 /*****************************************************************************
@@ -2042,13 +2008,8 @@ timestamptz_cmp_timestamp(PG_FUNCTION_ARGS)
 static int
 interval_cmp_internal(Interval *interval1, Interval *interval2)
 {
-#ifdef HAVE_INT64_TIMESTAMP
-	int64		span1,
-				span2;
-#else
-	double		span1,
+	TimeOffset	span1,
 				span2;
-#endif
 
 	span1 = interval1->time;
 	span2 = interval2->time;
@@ -2387,12 +2348,7 @@ interval_justify_interval(PG_FUNCTION_ARGS)
 {
 	Interval   *span = PG_GETARG_INTERVAL_P(0);
 	Interval   *result;
-
-#ifdef HAVE_INT64_TIMESTAMP
-	int64		wholeday;
-#else
-	double		wholeday;
-#endif
+	TimeOffset	wholeday;
 	int32		wholemonth;
 
 	result = (Interval *) palloc(sizeof(Interval));
@@ -2459,12 +2415,7 @@ interval_justify_hours(PG_FUNCTION_ARGS)
 {
 	Interval   *span = PG_GETARG_INTERVAL_P(0);
 	Interval   *result;
-
-#ifdef HAVE_INT64_TIMESTAMP
-	int64		wholeday;
-#else
-	double		wholeday;
-#endif
+	TimeOffset	wholeday;
 
 	result = (Interval *) palloc(sizeof(Interval));
 	result->month = span->month;

src/include/utils/date.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/utils/date.h,v 1.39 2008/01/01 19:45:59 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/utils/date.h,v 1.40 2008/03/21 01:31:43 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -29,11 +29,7 @@ typedef float8 TimeADT;
 
 typedef struct
 {
-#ifdef HAVE_INT64_TIMESTAMP
-	int64		time;			/* all time units other than months and years */
-#else
-	double		time;			/* all time units other than months and years */
-#endif
+	TimeADT		time;			/* all time units other than months and years */
 	int32		zone;			/* numeric time zone, in seconds */
 } TimeTzADT;
 
@@ -54,7 +50,8 @@ typedef struct
 #define DateADTGetDatum(X)	  Int32GetDatum(X)
 #define TimeADTGetDatum(X)	  Int64GetDatum(X)
 #define TimeTzADTPGetDatum(X) PointerGetDatum(X)
-#else
+
+#else  /* !HAVE_INT64_TIMESTAMP */
 
 #define MAX_TIME_PRECISION 10
 
@@ -69,6 +66,7 @@ typedef struct
 #define DateADTGetDatum(X)	  Int32GetDatum(X)
 #define TimeADTGetDatum(X)	  Float8GetDatum(X)
 #define TimeTzADTPGetDatum(X) PointerGetDatum(X)
+
 #endif   /* HAVE_INT64_TIMESTAMP */
 
 #define PG_GETARG_DATEADT(n)	 DatumGetDateADT(PG_GETARG_DATUM(n))

src/include/utils/timestamp.h

@@ -6,7 +6,7 @@
  * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/utils/timestamp.h,v 1.75 2008/02/17 02:09:31 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/utils/timestamp.h,v 1.76 2008/03/21 01:31:43 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -25,31 +25,42 @@
 
 /*
  * Timestamp represents absolute time.
+ *
  * Interval represents delta time. Keep track of months (and years), days,
- *	and time separately since the elapsed time spanned is unknown until
- *	instantiated relative to an absolute time.
+ * and hours/minutes/seconds separately since the elapsed time spanned is
+ * unknown until instantiated relative to an absolute time.
  *
  * Note that Postgres uses "time interval" to mean a bounded interval,
  * consisting of a beginning and ending time, not a time span - thomas 97/03/20
+ *
+ * We have two implementations, one that uses int64 values with units of
+ * microseconds, and one that uses double values with units of seconds.
+ *
+ * TimeOffset and fsec_t are convenience typedefs for temporary variables
+ * that are of different types in the two cases.  Do not use fsec_t in values
+ * stored on-disk, since it is not the same size in both implementations.
  */
 
 #ifdef HAVE_INT64_TIMESTAMP
+
 typedef int64 Timestamp;
 typedef int64 TimestampTz;
+typedef int64 TimeOffset;
+typedef int32 fsec_t;			/* fractional seconds (in microseconds) */
+
 #else
+
 typedef double Timestamp;
 typedef double TimestampTz;
+typedef double TimeOffset;
+typedef double fsec_t;			/* fractional seconds (in seconds) */
+
 #endif
 
 typedef struct
 {
-#ifdef HAVE_INT64_TIMESTAMP
-	int64		time;			/* all time units other than days, months and
-								 * years */
-#else
-	double		time;			/* all time units other than days, months and
+	TimeOffset	time;			/* all time units other than days, months and
 								 * years */
-#endif
 	int32		day;			/* days, after time for alignment */
 	int32		month;			/* months and years, after time for alignment */
 } Interval;
@@ -106,17 +117,18 @@ typedef struct
 #define TimestampTzGetDatum(X) Int64GetDatum(X)
 #define IntervalPGetDatum(X) PointerGetDatum(X)
 
-#define PG_GETARG_TIMESTAMP(n) PG_GETARG_INT64(n)
-#define PG_GETARG_TIMESTAMPTZ(n) PG_GETARG_INT64(n)
+#define PG_GETARG_TIMESTAMP(n) DatumGetTimestamp(PG_GETARG_DATUM(n))
+#define PG_GETARG_TIMESTAMPTZ(n) DatumGetTimestampTz(PG_GETARG_DATUM(n))
 #define PG_GETARG_INTERVAL_P(n) DatumGetIntervalP(PG_GETARG_DATUM(n))
 
-#define PG_RETURN_TIMESTAMP(x) PG_RETURN_INT64(x)
-#define PG_RETURN_TIMESTAMPTZ(x) PG_RETURN_INT64(x)
+#define PG_RETURN_TIMESTAMP(x) return TimestampGetDatum(x)
+#define PG_RETURN_TIMESTAMPTZ(x) return TimestampTzGetDatum(x)
 #define PG_RETURN_INTERVAL_P(x) return IntervalPGetDatum(x)
 
 #define DT_NOBEGIN		(-INT64CONST(0x7fffffffffffffff) - 1)
 #define DT_NOEND		(INT64CONST(0x7fffffffffffffff))
-#else
+
+#else  /* !HAVE_INT64_TIMESTAMP */
 
 #define DatumGetTimestamp(X)  ((Timestamp) DatumGetFloat8(X))
 #define DatumGetTimestampTz(X)	((TimestampTz) DatumGetFloat8(X))
@@ -141,6 +153,7 @@ typedef struct
 #define DT_NOBEGIN		(-DBL_MAX)
 #define DT_NOEND		(DBL_MAX)
 #endif
+
 #endif   /* HAVE_INT64_TIMESTAMP */
 
 
@@ -154,14 +167,6 @@ typedef struct
 
 #define TIMESTAMP_NOT_FINITE(j) (TIMESTAMP_IS_NOBEGIN(j) || TIMESTAMP_IS_NOEND(j))
 
-#ifdef HAVE_INT64_TIMESTAMP
-
-typedef int32 fsec_t;
-#else
-
-typedef double fsec_t;
-#endif
-
 /*
  *	Round off to MAX_TIMESTAMP_PRECISION decimal places.
  *	Note: this is also used for rounding off intervals.