Adding upstream version 14.5.upstream/14.5upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1208 insertions, 0 deletions

diff --git a/src/test/regress/regress.c b/src/test/regress/regress.c
new file mode 100644
index 0000000..351d79e
--- /dev/null
+++ b/src/test/regress/regress.c
@@ -0,0 +1,1208 @@
+/*------------------------------------------------------------------------
+ *
+ * regress.c
+ *	 Code for various C-language functions defined as part of the
+ *	 regression tests.
+ *
+ * This code is released under the terms of the PostgreSQL License.
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/test/regress/regress.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <math.h>
+#include <signal.h>
+
+#include "access/detoast.h"
+#include "access/htup_details.h"
+#include "access/transam.h"
+#include "access/xact.h"
+#include "catalog/namespace.h"
+#include "catalog/pg_operator.h"
+#include "catalog/pg_type.h"
+#include "commands/sequence.h"
+#include "commands/trigger.h"
+#include "executor/executor.h"
+#include "executor/spi.h"
+#include "funcapi.h"
+#include "mb/pg_wchar.h"
+#include "miscadmin.h"
+#include "nodes/supportnodes.h"
+#include "optimizer/optimizer.h"
+#include "optimizer/plancat.h"
+#include "parser/parse_coerce.h"
+#include "port/atomics.h"
+#include "storage/spin.h"
+#include "utils/builtins.h"
+#include "utils/geo_decls.h"
+#include "utils/memutils.h"
+#include "utils/rel.h"
+#include "utils/typcache.h"
+
+#define EXPECT_TRUE(expr)	\
+	do { \
+		if (!(expr)) \
+			elog(ERROR, \
+				 "%s was unexpectedly false in file \"%s\" line %u", \
+				 #expr, __FILE__, __LINE__); \
+	} while (0)
+
+#define EXPECT_EQ_U32(result_expr, expected_expr)	\
+	do { \
+		uint32		result = (result_expr); \
+		uint32		expected = (expected_expr); \
+		if (result != expected) \
+			elog(ERROR, \
+				 "%s yielded %u, expected %s in file \"%s\" line %u", \
+				 #result_expr, result, #expected_expr, __FILE__, __LINE__); \
+	} while (0)
+
+#define EXPECT_EQ_U64(result_expr, expected_expr)	\
+	do { \
+		uint64		result = (result_expr); \
+		uint64		expected = (expected_expr); \
+		if (result != expected) \
+			elog(ERROR, \
+				 "%s yielded " UINT64_FORMAT ", expected %s in file \"%s\" line %u", \
+				 #result_expr, result, #expected_expr, __FILE__, __LINE__); \
+	} while (0)
+
+#define LDELIM			'('
+#define RDELIM			')'
+#define DELIM			','
+
+static void regress_lseg_construct(LSEG *lseg, Point *pt1, Point *pt2);
+
+PG_MODULE_MAGIC;
+
+
+/* return the point where two paths intersect, or NULL if no intersection. */
+PG_FUNCTION_INFO_V1(interpt_pp);
+
+Datum
+interpt_pp(PG_FUNCTION_ARGS)
+{
+	PATH	   *p1 = PG_GETARG_PATH_P(0);
+	PATH	   *p2 = PG_GETARG_PATH_P(1);
+	int			i,
+				j;
+	LSEG		seg1,
+				seg2;
+	bool		found;			/* We've found the intersection */
+
+	found = false;				/* Haven't found it yet */
+
+	for (i = 0; i < p1->npts - 1 && !found; i++)
+	{
+		regress_lseg_construct(&seg1, &p1->p[i], &p1->p[i + 1]);
+		for (j = 0; j < p2->npts - 1 && !found; j++)
+		{
+			regress_lseg_construct(&seg2, &p2->p[j], &p2->p[j + 1]);
+			if (DatumGetBool(DirectFunctionCall2(lseg_intersect,
+												 LsegPGetDatum(&seg1),
+												 LsegPGetDatum(&seg2))))
+				found = true;
+		}
+	}
+
+	if (!found)
+		PG_RETURN_NULL();
+
+	/*
+	 * Note: DirectFunctionCall2 will kick out an error if lseg_interpt()
+	 * returns NULL, but that should be impossible since we know the two
+	 * segments intersect.
+	 */
+	PG_RETURN_DATUM(DirectFunctionCall2(lseg_interpt,
+										LsegPGetDatum(&seg1),
+										LsegPGetDatum(&seg2)));
+}
+
+
+/* like lseg_construct, but assume space already allocated */
+static void
+regress_lseg_construct(LSEG *lseg, Point *pt1, Point *pt2)
+{
+	lseg->p[0].x = pt1->x;
+	lseg->p[0].y = pt1->y;
+	lseg->p[1].x = pt2->x;
+	lseg->p[1].y = pt2->y;
+}
+
+PG_FUNCTION_INFO_V1(overpaid);
+
+Datum
+overpaid(PG_FUNCTION_ARGS)
+{
+	HeapTupleHeader tuple = PG_GETARG_HEAPTUPLEHEADER(0);
+	bool		isnull;
+	int32		salary;
+
+	salary = DatumGetInt32(GetAttributeByName(tuple, "salary", &isnull));
+	if (isnull)
+		PG_RETURN_NULL();
+	PG_RETURN_BOOL(salary > 699);
+}
+
+/* New type "widget"
+ * This used to be "circle", but I added circle to builtins,
+ *	so needed to make sure the names do not collide. - tgl 97/04/21
+ */
+
+typedef struct
+{
+	Point		center;
+	double		radius;
+} WIDGET;
+
+PG_FUNCTION_INFO_V1(widget_in);
+PG_FUNCTION_INFO_V1(widget_out);
+
+#define NARGS	3
+
+Datum
+widget_in(PG_FUNCTION_ARGS)
+{
+	char	   *str = PG_GETARG_CSTRING(0);
+	char	   *p,
+			   *coord[NARGS];
+	int			i;
+	WIDGET	   *result;
+
+	for (i = 0, p = str; *p && i < NARGS && *p != RDELIM; p++)
+	{
+		if (*p == DELIM || (*p == LDELIM && i == 0))
+			coord[i++] = p + 1;
+	}
+
+	if (i < NARGS)
+		ereport(ERROR,
+				(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
+				 errmsg("invalid input syntax for type %s: \"%s\"",
+						"widget", str)));
+
+	result = (WIDGET *) palloc(sizeof(WIDGET));
+	result->center.x = atof(coord[0]);
+	result->center.y = atof(coord[1]);
+	result->radius = atof(coord[2]);
+
+	PG_RETURN_POINTER(result);
+}
+
+Datum
+widget_out(PG_FUNCTION_ARGS)
+{
+	WIDGET	   *widget = (WIDGET *) PG_GETARG_POINTER(0);
+	char	   *str = psprintf("(%g,%g,%g)",
+							   widget->center.x, widget->center.y, widget->radius);
+
+	PG_RETURN_CSTRING(str);
+}
+
+PG_FUNCTION_INFO_V1(pt_in_widget);
+
+Datum
+pt_in_widget(PG_FUNCTION_ARGS)
+{
+	Point	   *point = PG_GETARG_POINT_P(0);
+	WIDGET	   *widget = (WIDGET *) PG_GETARG_POINTER(1);
+	float8		distance;
+
+	distance = DatumGetFloat8(DirectFunctionCall2(point_distance,
+												  PointPGetDatum(point),
+												  PointPGetDatum(&widget->center)));
+
+	PG_RETURN_BOOL(distance < widget->radius);
+}
+
+PG_FUNCTION_INFO_V1(reverse_name);
+
+Datum
+reverse_name(PG_FUNCTION_ARGS)
+{
+	char	   *string = PG_GETARG_CSTRING(0);
+	int			i;
+	int			len;
+	char	   *new_string;
+
+	new_string = palloc0(NAMEDATALEN);
+	for (i = 0; i < NAMEDATALEN && string[i]; ++i)
+		;
+	if (i == NAMEDATALEN || !string[i])
+		--i;
+	len = i;
+	for (; i >= 0; --i)
+		new_string[len - i] = string[i];
+	PG_RETURN_CSTRING(new_string);
+}
+
+PG_FUNCTION_INFO_V1(trigger_return_old);
+
+Datum
+trigger_return_old(PG_FUNCTION_ARGS)
+{
+	TriggerData *trigdata = (TriggerData *) fcinfo->context;
+	HeapTuple	tuple;
+
+	if (!CALLED_AS_TRIGGER(fcinfo))
+		elog(ERROR, "trigger_return_old: not fired by trigger manager");
+
+	tuple = trigdata->tg_trigtuple;
+
+	return PointerGetDatum(tuple);
+}
+
+#define TTDUMMY_INFINITY	999999
+
+static SPIPlanPtr splan = NULL;
+static bool ttoff = false;
+
+PG_FUNCTION_INFO_V1(ttdummy);
+
+Datum
+ttdummy(PG_FUNCTION_ARGS)
+{
+	TriggerData *trigdata = (TriggerData *) fcinfo->context;
+	Trigger    *trigger;		/* to get trigger name */
+	char	  **args;			/* arguments */
+	int			attnum[2];		/* fnumbers of start/stop columns */
+	Datum		oldon,
+				oldoff;
+	Datum		newon,
+				newoff;
+	Datum	   *cvals;			/* column values */
+	char	   *cnulls;			/* column nulls */
+	char	   *relname;		/* triggered relation name */
+	Relation	rel;			/* triggered relation */
+	HeapTuple	trigtuple;
+	HeapTuple	newtuple = NULL;
+	HeapTuple	rettuple;
+	TupleDesc	tupdesc;		/* tuple description */
+	int			natts;			/* # of attributes */
+	bool		isnull;			/* to know is some column NULL or not */
+	int			ret;
+	int			i;
+
+	if (!CALLED_AS_TRIGGER(fcinfo))
+		elog(ERROR, "ttdummy: not fired by trigger manager");
+	if (!TRIGGER_FIRED_FOR_ROW(trigdata->tg_event))
+		elog(ERROR, "ttdummy: must be fired for row");
+	if (!TRIGGER_FIRED_BEFORE(trigdata->tg_event))
+		elog(ERROR, "ttdummy: must be fired before event");
+	if (TRIGGER_FIRED_BY_INSERT(trigdata->tg_event))
+		elog(ERROR, "ttdummy: cannot process INSERT event");
+	if (TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
+		newtuple = trigdata->tg_newtuple;
+
+	trigtuple = trigdata->tg_trigtuple;
+
+	rel = trigdata->tg_relation;
+	relname = SPI_getrelname(rel);
+
+	/* check if TT is OFF for this relation */
+	if (ttoff)					/* OFF - nothing to do */
+	{
+		pfree(relname);
+		return PointerGetDatum((newtuple != NULL) ? newtuple : trigtuple);
+	}
+
+	trigger = trigdata->tg_trigger;
+
+	if (trigger->tgnargs != 2)
+		elog(ERROR, "ttdummy (%s): invalid (!= 2) number of arguments %d",
+			 relname, trigger->tgnargs);
+
+	args = trigger->tgargs;
+	tupdesc = rel->rd_att;
+	natts = tupdesc->natts;
+
+	for (i = 0; i < 2; i++)
+	{
+		attnum[i] = SPI_fnumber(tupdesc, args[i]);
+		if (attnum[i] <= 0)
+			elog(ERROR, "ttdummy (%s): there is no attribute %s",
+				 relname, args[i]);
+		if (SPI_gettypeid(tupdesc, attnum[i]) != INT4OID)
+			elog(ERROR, "ttdummy (%s): attribute %s must be of integer type",
+				 relname, args[i]);
+	}
+
+	oldon = SPI_getbinval(trigtuple, tupdesc, attnum[0], &isnull);
+	if (isnull)
+		elog(ERROR, "ttdummy (%s): %s must be NOT NULL", relname, args[0]);
+
+	oldoff = SPI_getbinval(trigtuple, tupdesc, attnum[1], &isnull);
+	if (isnull)
+		elog(ERROR, "ttdummy (%s): %s must be NOT NULL", relname, args[1]);
+
+	if (newtuple != NULL)		/* UPDATE */
+	{
+		newon = SPI_getbinval(newtuple, tupdesc, attnum[0], &isnull);
+		if (isnull)
+			elog(ERROR, "ttdummy (%s): %s must be NOT NULL", relname, args[0]);
+		newoff = SPI_getbinval(newtuple, tupdesc, attnum[1], &isnull);
+		if (isnull)
+			elog(ERROR, "ttdummy (%s): %s must be NOT NULL", relname, args[1]);
+
+		if (oldon != newon || oldoff != newoff)
+			ereport(ERROR,
+					(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+					 errmsg("ttdummy (%s): you cannot change %s and/or %s columns (use set_ttdummy)",
+							relname, args[0], args[1])));
+
+		if (newoff != TTDUMMY_INFINITY)
+		{
+			pfree(relname);		/* allocated in upper executor context */
+			return PointerGetDatum(NULL);
+		}
+	}
+	else if (oldoff != TTDUMMY_INFINITY)	/* DELETE */
+	{
+		pfree(relname);
+		return PointerGetDatum(NULL);
+	}
+
+	newoff = DirectFunctionCall1(nextval, CStringGetTextDatum("ttdummy_seq"));
+	/* nextval now returns int64; coerce down to int32 */
+	newoff = Int32GetDatum((int32) DatumGetInt64(newoff));
+
+	/* Connect to SPI manager */
+	if ((ret = SPI_connect()) < 0)
+		elog(ERROR, "ttdummy (%s): SPI_connect returned %d", relname, ret);
+
+	/* Fetch tuple values and nulls */
+	cvals = (Datum *) palloc(natts * sizeof(Datum));
+	cnulls = (char *) palloc(natts * sizeof(char));
+	for (i = 0; i < natts; i++)
+	{
+		cvals[i] = SPI_getbinval((newtuple != NULL) ? newtuple : trigtuple,
+								 tupdesc, i + 1, &isnull);
+		cnulls[i] = (isnull) ? 'n' : ' ';
+	}
+
+	/* change date column(s) */
+	if (newtuple)				/* UPDATE */
+	{
+		cvals[attnum[0] - 1] = newoff;	/* start_date eq current date */
+		cnulls[attnum[0] - 1] = ' ';
+		cvals[attnum[1] - 1] = TTDUMMY_INFINITY;	/* stop_date eq INFINITY */
+		cnulls[attnum[1] - 1] = ' ';
+	}
+	else
+		/* DELETE */
+	{
+		cvals[attnum[1] - 1] = newoff;	/* stop_date eq current date */
+		cnulls[attnum[1] - 1] = ' ';
+	}
+
+	/* if there is no plan ... */
+	if (splan == NULL)
+	{
+		SPIPlanPtr	pplan;
+		Oid		   *ctypes;
+		char	   *query;
+
+		/* allocate space in preparation */
+		ctypes = (Oid *) palloc(natts * sizeof(Oid));
+		query = (char *) palloc(100 + 16 * natts);
+
+		/*
+		 * Construct query: INSERT INTO _relation_ VALUES ($1, ...)
+		 */
+		sprintf(query, "INSERT INTO %s VALUES (", relname);
+		for (i = 1; i <= natts; i++)
+		{
+			sprintf(query + strlen(query), "$%d%s",
+					i, (i < natts) ? ", " : ")");
+			ctypes[i - 1] = SPI_gettypeid(tupdesc, i);
+		}
+
+		/* Prepare plan for query */
+		pplan = SPI_prepare(query, natts, ctypes);
+		if (pplan == NULL)
+			elog(ERROR, "ttdummy (%s): SPI_prepare returned %s", relname, SPI_result_code_string(SPI_result));
+
+		if (SPI_keepplan(pplan))
+			elog(ERROR, "ttdummy (%s): SPI_keepplan failed", relname);
+
+		splan = pplan;
+	}
+
+	ret = SPI_execp(splan, cvals, cnulls, 0);
+
+	if (ret < 0)
+		elog(ERROR, "ttdummy (%s): SPI_execp returned %d", relname, ret);
+
+	/* Tuple to return to upper Executor ... */
+	if (newtuple)				/* UPDATE */
+		rettuple = SPI_modifytuple(rel, trigtuple, 1, &(attnum[1]), &newoff, NULL);
+	else						/* DELETE */
+		rettuple = trigtuple;
+
+	SPI_finish();				/* don't forget say Bye to SPI mgr */
+
+	pfree(relname);
+
+	return PointerGetDatum(rettuple);
+}
+
+PG_FUNCTION_INFO_V1(set_ttdummy);
+
+Datum
+set_ttdummy(PG_FUNCTION_ARGS)
+{
+	int32		on = PG_GETARG_INT32(0);
+
+	if (ttoff)					/* OFF currently */
+	{
+		if (on == 0)
+			PG_RETURN_INT32(0);
+
+		/* turn ON */
+		ttoff = false;
+		PG_RETURN_INT32(0);
+	}
+
+	/* ON currently */
+	if (on != 0)
+		PG_RETURN_INT32(1);
+
+	/* turn OFF */
+	ttoff = true;
+
+	PG_RETURN_INT32(1);
+}
+
+
+/*
+ * Type int44 has no real-world use, but the regression tests use it
+ * (under the alias "city_budget").  It's a four-element vector of int4's.
+ */
+
+/*
+ *		int44in			- converts "num, num, ..." to internal form
+ *
+ *		Note: Fills any missing positions with zeroes.
+ */
+PG_FUNCTION_INFO_V1(int44in);
+
+Datum
+int44in(PG_FUNCTION_ARGS)
+{
+	char	   *input_string = PG_GETARG_CSTRING(0);
+	int32	   *result = (int32 *) palloc(4 * sizeof(int32));
+	int			i;
+
+	i = sscanf(input_string,
+			   "%d, %d, %d, %d",
+			   &result[0],
+			   &result[1],
+			   &result[2],
+			   &result[3]);
+	while (i < 4)
+		result[i++] = 0;
+
+	PG_RETURN_POINTER(result);
+}
+
+/*
+ *		int44out		- converts internal form to "num, num, ..."
+ */
+PG_FUNCTION_INFO_V1(int44out);
+
+Datum
+int44out(PG_FUNCTION_ARGS)
+{
+	int32	   *an_array = (int32 *) PG_GETARG_POINTER(0);
+	char	   *result = (char *) palloc(16 * 4);
+
+	snprintf(result, 16 * 4, "%d,%d,%d,%d",
+			 an_array[0],
+			 an_array[1],
+			 an_array[2],
+			 an_array[3]);
+
+	PG_RETURN_CSTRING(result);
+}
+
+PG_FUNCTION_INFO_V1(make_tuple_indirect);
+Datum
+make_tuple_indirect(PG_FUNCTION_ARGS)
+{
+	HeapTupleHeader rec = PG_GETARG_HEAPTUPLEHEADER(0);
+	HeapTupleData tuple;
+	int			ncolumns;
+	Datum	   *values;
+	bool	   *nulls;
+
+	Oid			tupType;
+	int32		tupTypmod;
+	TupleDesc	tupdesc;
+
+	HeapTuple	newtup;
+
+	int			i;
+
+	MemoryContext old_context;
+
+	/* Extract type info from the tuple itself */
+	tupType = HeapTupleHeaderGetTypeId(rec);
+	tupTypmod = HeapTupleHeaderGetTypMod(rec);
+	tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
+	ncolumns = tupdesc->natts;
+
+	/* Build a temporary HeapTuple control structure */
+	tuple.t_len = HeapTupleHeaderGetDatumLength(rec);
+	ItemPointerSetInvalid(&(tuple.t_self));
+	tuple.t_tableOid = InvalidOid;
+	tuple.t_data = rec;
+
+	values = (Datum *) palloc(ncolumns * sizeof(Datum));
+	nulls = (bool *) palloc(ncolumns * sizeof(bool));
+
+	heap_deform_tuple(&tuple, tupdesc, values, nulls);
+
+	old_context = MemoryContextSwitchTo(TopTransactionContext);
+
+	for (i = 0; i < ncolumns; i++)
+	{
+		struct varlena *attr;
+		struct varlena *new_attr;
+		struct varatt_indirect redirect_pointer;
+
+		/* only work on existing, not-null varlenas */
+		if (TupleDescAttr(tupdesc, i)->attisdropped ||
+			nulls[i] ||
+			TupleDescAttr(tupdesc, i)->attlen != -1)
+			continue;
+
+		attr = (struct varlena *) DatumGetPointer(values[i]);
+
+		/* don't recursively indirect */
+		if (VARATT_IS_EXTERNAL_INDIRECT(attr))
+			continue;
+
+		/* copy datum, so it still lives later */
+		if (VARATT_IS_EXTERNAL_ONDISK(attr))
+			attr = detoast_external_attr(attr);
+		else
+		{
+			struct varlena *oldattr = attr;
+
+			attr = palloc0(VARSIZE_ANY(oldattr));
+			memcpy(attr, oldattr, VARSIZE_ANY(oldattr));
+		}
+
+		/* build indirection Datum */
+		new_attr = (struct varlena *) palloc0(INDIRECT_POINTER_SIZE);
+		redirect_pointer.pointer = attr;
+		SET_VARTAG_EXTERNAL(new_attr, VARTAG_INDIRECT);
+		memcpy(VARDATA_EXTERNAL(new_attr), &redirect_pointer,
+			   sizeof(redirect_pointer));
+
+		values[i] = PointerGetDatum(new_attr);
+	}
+
+	newtup = heap_form_tuple(tupdesc, values, nulls);
+	pfree(values);
+	pfree(nulls);
+	ReleaseTupleDesc(tupdesc);
+
+	MemoryContextSwitchTo(old_context);
+
+	/*
+	 * We intentionally don't use PG_RETURN_HEAPTUPLEHEADER here, because that
+	 * would cause the indirect toast pointers to be flattened out of the
+	 * tuple immediately, rendering subsequent testing irrelevant.  So just
+	 * return the HeapTupleHeader pointer as-is.  This violates the general
+	 * rule that composite Datums shouldn't contain toast pointers, but so
+	 * long as the regression test scripts don't insert the result of this
+	 * function into a container type (record, array, etc) it should be OK.
+	 */
+	PG_RETURN_POINTER(newtup->t_data);
+}
+
+PG_FUNCTION_INFO_V1(regress_setenv);
+
+Datum
+regress_setenv(PG_FUNCTION_ARGS)
+{
+	char	   *envvar = text_to_cstring(PG_GETARG_TEXT_PP(0));
+	char	   *envval = text_to_cstring(PG_GETARG_TEXT_PP(1));
+
+	if (!superuser())
+		elog(ERROR, "must be superuser to change environment variables");
+
+	if (setenv(envvar, envval, 1) != 0)
+		elog(ERROR, "could not set environment variable: %m");
+
+	PG_RETURN_VOID();
+}
+
+/* Sleep until no process has a given PID. */
+PG_FUNCTION_INFO_V1(wait_pid);
+
+Datum
+wait_pid(PG_FUNCTION_ARGS)
+{
+	int			pid = PG_GETARG_INT32(0);
+
+	if (!superuser())
+		elog(ERROR, "must be superuser to check PID liveness");
+
+	while (kill(pid, 0) == 0)
+	{
+		CHECK_FOR_INTERRUPTS();
+		pg_usleep(50000);
+	}
+
+	if (errno != ESRCH)
+		elog(ERROR, "could not check PID %d liveness: %m", pid);
+
+	PG_RETURN_VOID();
+}
+
+static void
+test_atomic_flag(void)
+{
+	pg_atomic_flag flag;
+
+	pg_atomic_init_flag(&flag);
+	EXPECT_TRUE(pg_atomic_unlocked_test_flag(&flag));
+	EXPECT_TRUE(pg_atomic_test_set_flag(&flag));
+	EXPECT_TRUE(!pg_atomic_unlocked_test_flag(&flag));
+	EXPECT_TRUE(!pg_atomic_test_set_flag(&flag));
+	pg_atomic_clear_flag(&flag);
+	EXPECT_TRUE(pg_atomic_unlocked_test_flag(&flag));
+	EXPECT_TRUE(pg_atomic_test_set_flag(&flag));
+	pg_atomic_clear_flag(&flag);
+}
+
+static void
+test_atomic_uint32(void)
+{
+	pg_atomic_uint32 var;
+	uint32		expected;
+	int			i;
+
+	pg_atomic_init_u32(&var, 0);
+	EXPECT_EQ_U32(pg_atomic_read_u32(&var), 0);
+	pg_atomic_write_u32(&var, 3);
+	EXPECT_EQ_U32(pg_atomic_read_u32(&var), 3);
+	EXPECT_EQ_U32(pg_atomic_fetch_add_u32(&var, pg_atomic_read_u32(&var) - 2),
+				  3);
+	EXPECT_EQ_U32(pg_atomic_fetch_sub_u32(&var, 1), 4);
+	EXPECT_EQ_U32(pg_atomic_sub_fetch_u32(&var, 3), 0);
+	EXPECT_EQ_U32(pg_atomic_add_fetch_u32(&var, 10), 10);
+	EXPECT_EQ_U32(pg_atomic_exchange_u32(&var, 5), 10);
+	EXPECT_EQ_U32(pg_atomic_exchange_u32(&var, 0), 5);
+
+	/* test around numerical limits */
+	EXPECT_EQ_U32(pg_atomic_fetch_add_u32(&var, INT_MAX), 0);
+	EXPECT_EQ_U32(pg_atomic_fetch_add_u32(&var, INT_MAX), INT_MAX);
+	pg_atomic_fetch_add_u32(&var, 2);	/* wrap to 0 */
+	EXPECT_EQ_U32(pg_atomic_fetch_add_u32(&var, PG_INT16_MAX), 0);
+	EXPECT_EQ_U32(pg_atomic_fetch_add_u32(&var, PG_INT16_MAX + 1),
+				  PG_INT16_MAX);
+	EXPECT_EQ_U32(pg_atomic_fetch_add_u32(&var, PG_INT16_MIN),
+				  2 * PG_INT16_MAX + 1);
+	EXPECT_EQ_U32(pg_atomic_fetch_add_u32(&var, PG_INT16_MIN - 1),
+				  PG_INT16_MAX);
+	pg_atomic_fetch_add_u32(&var, 1);	/* top up to UINT_MAX */
+	EXPECT_EQ_U32(pg_atomic_read_u32(&var), UINT_MAX);
+	EXPECT_EQ_U32(pg_atomic_fetch_sub_u32(&var, INT_MAX), UINT_MAX);
+	EXPECT_EQ_U32(pg_atomic_read_u32(&var), (uint32) INT_MAX + 1);
+	EXPECT_EQ_U32(pg_atomic_sub_fetch_u32(&var, INT_MAX), 1);
+	pg_atomic_sub_fetch_u32(&var, 1);
+	expected = PG_INT16_MAX;
+	EXPECT_TRUE(!pg_atomic_compare_exchange_u32(&var, &expected, 1));
+	expected = PG_INT16_MAX + 1;
+	EXPECT_TRUE(!pg_atomic_compare_exchange_u32(&var, &expected, 1));
+	expected = PG_INT16_MIN;
+	EXPECT_TRUE(!pg_atomic_compare_exchange_u32(&var, &expected, 1));
+	expected = PG_INT16_MIN - 1;
+	EXPECT_TRUE(!pg_atomic_compare_exchange_u32(&var, &expected, 1));
+
+	/* fail exchange because of old expected */
+	expected = 10;
+	EXPECT_TRUE(!pg_atomic_compare_exchange_u32(&var, &expected, 1));
+
+	/* CAS is allowed to fail due to interrupts, try a couple of times */
+	for (i = 0; i < 1000; i++)
+	{
+		expected = 0;
+		if (!pg_atomic_compare_exchange_u32(&var, &expected, 1))
+			break;
+	}
+	if (i == 1000)
+		elog(ERROR, "atomic_compare_exchange_u32() never succeeded");
+	EXPECT_EQ_U32(pg_atomic_read_u32(&var), 1);
+	pg_atomic_write_u32(&var, 0);
+
+	/* try setting flagbits */
+	EXPECT_TRUE(!(pg_atomic_fetch_or_u32(&var, 1) & 1));
+	EXPECT_TRUE(pg_atomic_fetch_or_u32(&var, 2) & 1);
+	EXPECT_EQ_U32(pg_atomic_read_u32(&var), 3);
+	/* try clearing flagbits */
+	EXPECT_EQ_U32(pg_atomic_fetch_and_u32(&var, ~2) & 3, 3);
+	EXPECT_EQ_U32(pg_atomic_fetch_and_u32(&var, ~1), 1);
+	/* no bits set anymore */
+	EXPECT_EQ_U32(pg_atomic_fetch_and_u32(&var, ~0), 0);
+}
+
+static void
+test_atomic_uint64(void)
+{
+	pg_atomic_uint64 var;
+	uint64		expected;
+	int			i;
+
+	pg_atomic_init_u64(&var, 0);
+	EXPECT_EQ_U64(pg_atomic_read_u64(&var), 0);
+	pg_atomic_write_u64(&var, 3);
+	EXPECT_EQ_U64(pg_atomic_read_u64(&var), 3);
+	EXPECT_EQ_U64(pg_atomic_fetch_add_u64(&var, pg_atomic_read_u64(&var) - 2),
+				  3);
+	EXPECT_EQ_U64(pg_atomic_fetch_sub_u64(&var, 1), 4);
+	EXPECT_EQ_U64(pg_atomic_sub_fetch_u64(&var, 3), 0);
+	EXPECT_EQ_U64(pg_atomic_add_fetch_u64(&var, 10), 10);
+	EXPECT_EQ_U64(pg_atomic_exchange_u64(&var, 5), 10);
+	EXPECT_EQ_U64(pg_atomic_exchange_u64(&var, 0), 5);
+
+	/* fail exchange because of old expected */
+	expected = 10;
+	EXPECT_TRUE(!pg_atomic_compare_exchange_u64(&var, &expected, 1));
+
+	/* CAS is allowed to fail due to interrupts, try a couple of times */
+	for (i = 0; i < 100; i++)
+	{
+		expected = 0;
+		if (!pg_atomic_compare_exchange_u64(&var, &expected, 1))
+			break;
+	}
+	if (i == 100)
+		elog(ERROR, "atomic_compare_exchange_u64() never succeeded");
+	EXPECT_EQ_U64(pg_atomic_read_u64(&var), 1);
+
+	pg_atomic_write_u64(&var, 0);
+
+	/* try setting flagbits */
+	EXPECT_TRUE(!(pg_atomic_fetch_or_u64(&var, 1) & 1));
+	EXPECT_TRUE(pg_atomic_fetch_or_u64(&var, 2) & 1);
+	EXPECT_EQ_U64(pg_atomic_read_u64(&var), 3);
+	/* try clearing flagbits */
+	EXPECT_EQ_U64((pg_atomic_fetch_and_u64(&var, ~2) & 3), 3);
+	EXPECT_EQ_U64(pg_atomic_fetch_and_u64(&var, ~1), 1);
+	/* no bits set anymore */
+	EXPECT_EQ_U64(pg_atomic_fetch_and_u64(&var, ~0), 0);
+}
+
+/*
+ * Perform, fairly minimal, testing of the spinlock implementation.
+ *
+ * It's likely worth expanding these to actually test concurrency etc, but
+ * having some regularly run tests is better than none.
+ */
+static void
+test_spinlock(void)
+{
+	/*
+	 * Basic tests for spinlocks, as well as the underlying operations.
+	 *
+	 * We embed the spinlock in a struct with other members to test that the
+	 * spinlock operations don't perform too wide writes.
+	 */
+	{
+		struct test_lock_struct
+		{
+			char		data_before[4];
+			slock_t		lock;
+			char		data_after[4];
+		}			struct_w_lock;
+
+		memcpy(struct_w_lock.data_before, "abcd", 4);
+		memcpy(struct_w_lock.data_after, "ef12", 4);
+
+		/* test basic operations via the SpinLock* API */
+		SpinLockInit(&struct_w_lock.lock);
+		SpinLockAcquire(&struct_w_lock.lock);
+		SpinLockRelease(&struct_w_lock.lock);
+
+		/* test basic operations via underlying S_* API */
+		S_INIT_LOCK(&struct_w_lock.lock);
+		S_LOCK(&struct_w_lock.lock);
+		S_UNLOCK(&struct_w_lock.lock);
+
+		/* and that "contended" acquisition works */
+		s_lock(&struct_w_lock.lock, "testfile", 17, "testfunc");
+		S_UNLOCK(&struct_w_lock.lock);
+
+		/*
+		 * Check, using TAS directly, that a single spin cycle doesn't block
+		 * when acquiring an already acquired lock.
+		 */
+#ifdef TAS
+		S_LOCK(&struct_w_lock.lock);
+
+		if (!TAS(&struct_w_lock.lock))
+			elog(ERROR, "acquired already held spinlock");
+
+#ifdef TAS_SPIN
+		if (!TAS_SPIN(&struct_w_lock.lock))
+			elog(ERROR, "acquired already held spinlock");
+#endif							/* defined(TAS_SPIN) */
+
+		S_UNLOCK(&struct_w_lock.lock);
+#endif							/* defined(TAS) */
+
+		/*
+		 * Verify that after all of this the non-lock contents are still
+		 * correct.
+		 */
+		if (memcmp(struct_w_lock.data_before, "abcd", 4) != 0)
+			elog(ERROR, "padding before spinlock modified");
+		if (memcmp(struct_w_lock.data_after, "ef12", 4) != 0)
+			elog(ERROR, "padding after spinlock modified");
+	}
+
+	/*
+	 * Ensure that allocating more than INT32_MAX emulated spinlocks works.
+	 * That's interesting because the spinlock emulation uses a 32bit integer
+	 * to map spinlocks onto semaphores. There've been bugs...
+	 */
+#ifndef HAVE_SPINLOCKS
+	{
+		/*
+		 * Initialize enough spinlocks to advance counter close to wraparound.
+		 * It's too expensive to perform acquire/release for each, as those
+		 * may be syscalls when the spinlock emulation is used (and even just
+		 * atomic TAS would be expensive).
+		 */
+		for (uint32 i = 0; i < INT32_MAX - 100000; i++)
+		{
+			slock_t		lock;
+
+			SpinLockInit(&lock);
+		}
+
+		for (uint32 i = 0; i < 200000; i++)
+		{
+			slock_t		lock;
+
+			SpinLockInit(&lock);
+
+			SpinLockAcquire(&lock);
+			SpinLockRelease(&lock);
+			SpinLockAcquire(&lock);
+			SpinLockRelease(&lock);
+		}
+	}
+#endif
+}
+
+/*
+ * Verify that performing atomic ops inside a spinlock isn't a
+ * problem. Realistically that's only going to be a problem when both
+ * --disable-spinlocks and --disable-atomics are used, but it's cheap enough
+ * to just always test.
+ *
+ * The test works by initializing enough atomics that we'd conflict if there
+ * were an overlap between a spinlock and an atomic by holding a spinlock
+ * while manipulating more than NUM_SPINLOCK_SEMAPHORES atomics.
+ *
+ * NUM_TEST_ATOMICS doesn't really need to be more than
+ * NUM_SPINLOCK_SEMAPHORES, but it seems better to test a bit more
+ * extensively.
+ */
+static void
+test_atomic_spin_nest(void)
+{
+	slock_t		lock;
+#define NUM_TEST_ATOMICS (NUM_SPINLOCK_SEMAPHORES + NUM_ATOMICS_SEMAPHORES + 27)
+	pg_atomic_uint32 atomics32[NUM_TEST_ATOMICS];
+	pg_atomic_uint64 atomics64[NUM_TEST_ATOMICS];
+
+	SpinLockInit(&lock);
+
+	for (int i = 0; i < NUM_TEST_ATOMICS; i++)
+	{
+		pg_atomic_init_u32(&atomics32[i], 0);
+		pg_atomic_init_u64(&atomics64[i], 0);
+	}
+
+	/* just so it's not all zeroes */
+	for (int i = 0; i < NUM_TEST_ATOMICS; i++)
+	{
+		EXPECT_EQ_U32(pg_atomic_fetch_add_u32(&atomics32[i], i), 0);
+		EXPECT_EQ_U64(pg_atomic_fetch_add_u64(&atomics64[i], i), 0);
+	}
+
+	/* test whether we can do atomic op with lock held */
+	SpinLockAcquire(&lock);
+	for (int i = 0; i < NUM_TEST_ATOMICS; i++)
+	{
+		EXPECT_EQ_U32(pg_atomic_fetch_sub_u32(&atomics32[i], i), i);
+		EXPECT_EQ_U32(pg_atomic_read_u32(&atomics32[i]), 0);
+		EXPECT_EQ_U64(pg_atomic_fetch_sub_u64(&atomics64[i], i), i);
+		EXPECT_EQ_U64(pg_atomic_read_u64(&atomics64[i]), 0);
+	}
+	SpinLockRelease(&lock);
+}
+#undef NUM_TEST_ATOMICS
+
+PG_FUNCTION_INFO_V1(test_atomic_ops);
+Datum
+test_atomic_ops(PG_FUNCTION_ARGS)
+{
+	test_atomic_flag();
+
+	test_atomic_uint32();
+
+	test_atomic_uint64();
+
+	/*
+	 * Arguably this shouldn't be tested as part of this function, but it's
+	 * closely enough related that that seems ok for now.
+	 */
+	test_spinlock();
+
+	test_atomic_spin_nest();
+
+	PG_RETURN_BOOL(true);
+}
+
+PG_FUNCTION_INFO_V1(test_fdw_handler);
+Datum
+test_fdw_handler(PG_FUNCTION_ARGS)
+{
+	elog(ERROR, "test_fdw_handler is not implemented");
+	PG_RETURN_NULL();
+}
+
+PG_FUNCTION_INFO_V1(test_support_func);
+Datum
+test_support_func(PG_FUNCTION_ARGS)
+{
+	Node	   *rawreq = (Node *) PG_GETARG_POINTER(0);
+	Node	   *ret = NULL;
+
+	if (IsA(rawreq, SupportRequestSelectivity))
+	{
+		/*
+		 * Assume that the target is int4eq; that's safe as long as we don't
+		 * attach this to any other boolean-returning function.
+		 */
+		SupportRequestSelectivity *req = (SupportRequestSelectivity *) rawreq;
+		Selectivity s1;
+
+		if (req->is_join)
+			s1 = join_selectivity(req->root, Int4EqualOperator,
+								  req->args,
+								  req->inputcollid,
+								  req->jointype,
+								  req->sjinfo);
+		else
+			s1 = restriction_selectivity(req->root, Int4EqualOperator,
+										 req->args,
+										 req->inputcollid,
+										 req->varRelid);
+
+		req->selectivity = s1;
+		ret = (Node *) req;
+	}
+
+	if (IsA(rawreq, SupportRequestCost))
+	{
+		/* Provide some generic estimate */
+		SupportRequestCost *req = (SupportRequestCost *) rawreq;
+
+		req->startup = 0;
+		req->per_tuple = 2 * cpu_operator_cost;
+		ret = (Node *) req;
+	}
+
+	if (IsA(rawreq, SupportRequestRows))
+	{
+		/*
+		 * Assume that the target is generate_series_int4; that's safe as long
+		 * as we don't attach this to any other set-returning function.
+		 */
+		SupportRequestRows *req = (SupportRequestRows *) rawreq;
+
+		if (req->node && IsA(req->node, FuncExpr))	/* be paranoid */
+		{
+			List	   *args = ((FuncExpr *) req->node)->args;
+			Node	   *arg1 = linitial(args);
+			Node	   *arg2 = lsecond(args);
+
+			if (IsA(arg1, Const) &&
+				!((Const *) arg1)->constisnull &&
+				IsA(arg2, Const) &&
+				!((Const *) arg2)->constisnull)
+			{
+				int32		val1 = DatumGetInt32(((Const *) arg1)->constvalue);
+				int32		val2 = DatumGetInt32(((Const *) arg2)->constvalue);
+
+				req->rows = val2 - val1 + 1;
+				ret = (Node *) req;
+			}
+		}
+	}
+
+	PG_RETURN_POINTER(ret);
+}
+
+PG_FUNCTION_INFO_V1(test_opclass_options_func);
+Datum
+test_opclass_options_func(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+
+/*
+ * Call an encoding conversion or verification function.
+ *
+ * Arguments:
+ *	string	  bytea -- string to convert
+ *	src_enc	  name  -- source encoding
+ *	dest_enc  name  -- destination encoding
+ *	noError	  bool  -- if set, don't ereport() on invalid or untranslatable
+ *					   input
+ *
+ * Result is a tuple with two attributes:
+ *  int4	-- number of input bytes successfully converted
+ *  bytea	-- converted string
+ */
+PG_FUNCTION_INFO_V1(test_enc_conversion);
+Datum
+test_enc_conversion(PG_FUNCTION_ARGS)
+{
+	bytea	   *string = PG_GETARG_BYTEA_PP(0);
+	char	   *src_encoding_name = NameStr(*PG_GETARG_NAME(1));
+	int			src_encoding = pg_char_to_encoding(src_encoding_name);
+	char	   *dest_encoding_name = NameStr(*PG_GETARG_NAME(2));
+	int			dest_encoding = pg_char_to_encoding(dest_encoding_name);
+	bool		noError = PG_GETARG_BOOL(3);
+	TupleDesc	tupdesc;
+	char	   *src;
+	char	   *dst;
+	bytea	   *retval;
+	Size		srclen;
+	Size		dstsize;
+	Oid			proc;
+	int			convertedbytes;
+	int			dstlen;
+	Datum		values[2];
+	bool		nulls[2];
+	HeapTuple	tuple;
+
+	if (src_encoding < 0)
+		ereport(ERROR,
+				(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+				 errmsg("invalid source encoding name \"%s\"",
+						src_encoding_name)));
+	if (dest_encoding < 0)
+		ereport(ERROR,
+				(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+				 errmsg("invalid destination encoding name \"%s\"",
+						dest_encoding_name)));
+
+	/* Build a tuple descriptor for our result type */
+	if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
+		elog(ERROR, "return type must be a row type");
+	tupdesc = BlessTupleDesc(tupdesc);
+
+	srclen = VARSIZE_ANY_EXHDR(string);
+	src = VARDATA_ANY(string);
+
+	if (src_encoding == dest_encoding)
+	{
+		/* just check that the source string is valid */
+		int			oklen;
+
+		oklen = pg_encoding_verifymbstr(src_encoding, src, srclen);
+
+		if (oklen == srclen)
+		{
+			convertedbytes = oklen;
+			retval = string;
+		}
+		else if (!noError)
+		{
+			report_invalid_encoding(src_encoding, src + oklen, srclen - oklen);
+		}
+		else
+		{
+			/*
+			 * build bytea data type structure.
+			 */
+			Assert(oklen < srclen);
+			convertedbytes = oklen;
+			retval = (bytea *) palloc(oklen + VARHDRSZ);
+			SET_VARSIZE(retval, oklen + VARHDRSZ);
+			memcpy(VARDATA(retval), src, oklen);
+		}
+	}
+	else
+	{
+		proc = FindDefaultConversionProc(src_encoding, dest_encoding);
+		if (!OidIsValid(proc))
+			ereport(ERROR,
+					(errcode(ERRCODE_UNDEFINED_FUNCTION),
+					 errmsg("default conversion function for encoding \"%s\" to \"%s\" does not exist",
+							pg_encoding_to_char(src_encoding),
+							pg_encoding_to_char(dest_encoding))));
+
+		if (srclen >= (MaxAllocSize / (Size) MAX_CONVERSION_GROWTH))
+			ereport(ERROR,
+					(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
+					 errmsg("out of memory"),
+					 errdetail("String of %d bytes is too long for encoding conversion.",
+							   (int) srclen)));
+
+		dstsize = (Size) srclen * MAX_CONVERSION_GROWTH + 1;
+		dst = MemoryContextAlloc(CurrentMemoryContext, dstsize);
+
+		/* perform conversion */
+		convertedbytes = pg_do_encoding_conversion_buf(proc,
+													   src_encoding,
+													   dest_encoding,
+													   (unsigned char *) src, srclen,
+													   (unsigned char *) dst, dstsize,
+													   noError);
+		dstlen = strlen(dst);
+
+		/*
+		 * build bytea data type structure.
+		 */
+		retval = (bytea *) palloc(dstlen + VARHDRSZ);
+		SET_VARSIZE(retval, dstlen + VARHDRSZ);
+		memcpy(VARDATA(retval), dst, dstlen);
+
+		pfree(dst);
+	}
+
+	MemSet(nulls, 0, sizeof(nulls));
+	values[0] = Int32GetDatum(convertedbytes);
+	values[1] = PointerGetDatum(retval);
+	tuple = heap_form_tuple(tupdesc, values, nulls);
+
+	PG_RETURN_DATUM(HeapTupleGetDatum(tuple));
+}
+
+/* Provide SQL access to IsBinaryCoercible() */
+PG_FUNCTION_INFO_V1(binary_coercible);
+Datum
+binary_coercible(PG_FUNCTION_ARGS)
+{
+	Oid			srctype = PG_GETARG_OID(0);
+	Oid			targettype = PG_GETARG_OID(1);
+
+	PG_RETURN_BOOL(IsBinaryCoercible(srctype, targettype));
+}