fmgrtab.h

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/*-------------------------------------------------------------------------
 *
 * fmgrtab.h
 *    The function manager's table of internal functions.
 *
 * Portions Copyright (c) 1996-2025, 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 */