1 files changed, 117 insertions, 0 deletions
diff --git a/src/backend/access/rmgrdesc/gistdesc.c b/src/backend/access/rmgrdesc/gistdesc.c
new file mode 100644
index 0000000..8ae3112
--- /dev/null
+++ b/src/backend/access/rmgrdesc/gistdesc.c
@@ -0,0 +1,117 @@
+/*-------------------------------------------------------------------------
+ *
+ * gistdesc.c
+ *	  rmgr descriptor routines for access/gist/gistxlog.c
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ *
+ * IDENTIFICATION
+ *	  src/backend/access/rmgrdesc/gistdesc.c
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "postgres.h"
+
+#include "access/gistxlog.h"
+#include "lib/stringinfo.h"
+#include "storage/relfilenode.h"
+
+static void
+out_gistxlogPageUpdate(StringInfo buf, gistxlogPageUpdate *xlrec)
+{
+}
+
+static void
+out_gistxlogPageReuse(StringInfo buf, gistxlogPageReuse *xlrec)
+{
+	appendStringInfo(buf, "rel %u/%u/%u; blk %u; latestRemovedXid %u:%u",
+					 xlrec->node.spcNode, xlrec->node.dbNode,
+					 xlrec->node.relNode, xlrec->block,
+					 EpochFromFullTransactionId(xlrec->latestRemovedFullXid),
+					 XidFromFullTransactionId(xlrec->latestRemovedFullXid));
+}
+
+static void
+out_gistxlogDelete(StringInfo buf, gistxlogDelete *xlrec)
+{
+	appendStringInfo(buf, "delete: latestRemovedXid %u, nitems: %u",
+					 xlrec->latestRemovedXid, xlrec->ntodelete);
+
+}
+
+static void
+out_gistxlogPageSplit(StringInfo buf, gistxlogPageSplit *xlrec)
+{
+	appendStringInfo(buf, "page_split: splits to %d pages",
+					 xlrec->npage);
+}
+
+static void
+out_gistxlogPageDelete(StringInfo buf, gistxlogPageDelete *xlrec)
+{
+	appendStringInfo(buf, "deleteXid %u:%u; downlink %u",
+					 EpochFromFullTransactionId(xlrec->deleteXid),
+					 XidFromFullTransactionId(xlrec->deleteXid),
+					 xlrec->downlinkOffset);
+}
+
+void
+gist_desc(StringInfo buf, XLogReaderState *record)
+{
+	char	   *rec = XLogRecGetData(record);
+	uint8		info = XLogRecGetInfo(record) & ~XLR_INFO_MASK;
+
+	switch (info)
+	{
+		case XLOG_GIST_PAGE_UPDATE:
+			out_gistxlogPageUpdate(buf, (gistxlogPageUpdate *) rec);
+			break;
+		case XLOG_GIST_PAGE_REUSE:
+			out_gistxlogPageReuse(buf, (gistxlogPageReuse *) rec);
+			break;
+		case XLOG_GIST_DELETE:
+			out_gistxlogDelete(buf, (gistxlogDelete *) rec);
+			break;
+		case XLOG_GIST_PAGE_SPLIT:
+			out_gistxlogPageSplit(buf, (gistxlogPageSplit *) rec);
+			break;
+		case XLOG_GIST_PAGE_DELETE:
+			out_gistxlogPageDelete(buf, (gistxlogPageDelete *) rec);
+			break;
+		case XLOG_GIST_ASSIGN_LSN:
+			/* No details to write out */
+			break;
+	}
+}
+
+const char *
+gist_identify(uint8 info)
+{
+	const char *id = NULL;
+
+	switch (info & ~XLR_INFO_MASK)
+	{
+		case XLOG_GIST_PAGE_UPDATE:
+			id = "PAGE_UPDATE";
+			break;
+		case XLOG_GIST_DELETE:
+			id = "DELETE";
+			break;
+		case XLOG_GIST_PAGE_REUSE:
+			id = "PAGE_REUSE";
+			break;
+		case XLOG_GIST_PAGE_SPLIT:
+			id = "PAGE_SPLIT";
+			break;
+		case XLOG_GIST_PAGE_DELETE:
+			id = "PAGE_DELETE";
+			break;
+		case XLOG_GIST_ASSIGN_LSN:
+			id = "ASSIGN_LSN";
+			break;
+	}
+
+	return id;
+}