1 files changed, 49 insertions, 0 deletions
diff --git a/src/include/utils/fmgrtab.h b/src/include/utils/fmgrtab.h
new file mode 100644
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--- /dev/null
+++ b/src/include/utils/fmgrtab.h
@@ -0,0 +1,49 @@
+/*-------------------------------------------------------------------------
+ *
+ * fmgrtab.h
+ *	  The function manager's table of internal functions.
+ *
+ * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/utils/fmgrtab.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef FMGRTAB_H
+#define FMGRTAB_H
+
+#include "access/transam.h"
+#include "fmgr.h"
+
+
+/*
+ * This table stores info about all the built-in functions (ie, functions
+ * that are compiled into the Postgres executable).
+ */
+
+typedef struct
+{
+	Oid			foid;			/* OID of the function */
+	short		nargs;			/* 0..FUNC_MAX_ARGS, or -1 if variable count */
+	bool		strict;			/* T if function is "strict" */
+	bool		retset;			/* T if function returns a set */
+	const char *funcName;		/* C name of the function */
+	PGFunction	func;			/* pointer to compiled function */
+} FmgrBuiltin;
+
+extern PGDLLIMPORT const FmgrBuiltin fmgr_builtins[];
+
+extern PGDLLIMPORT const int fmgr_nbuiltins;	/* number of entries in table */
+
+extern PGDLLIMPORT const Oid fmgr_last_builtin_oid; /* highest function OID in
+													 * table */
+
+/*
+ * Mapping from a builtin function's OID to its index in the fmgr_builtins
+ * array.  This is indexed from 0 through fmgr_last_builtin_oid.
+ */
+#define InvalidOidBuiltinMapping PG_UINT16_MAX
+extern PGDLLIMPORT const uint16 fmgr_builtin_oid_index[];
+
+#endif							/* FMGRTAB_H */