src/include/utils/fmgrtab.h

   1 /*-------------------------------------------------------------------------
   2  *
   3  * fmgrtab.h
   4  *        The function manager's table of internal functions.
   5  *
   6  * Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
   7  * Portions Copyright (c) 1994, Regents of the University of California
   8  *
   9  * src/include/utils/fmgrtab.h
  10  *
  11  *-------------------------------------------------------------------------
  12  */
  13 #ifndef FMGRTAB_H
  14 #define FMGRTAB_H
  15
  16 #include "access/transam.h"
  17 #include "fmgr.h"
  18
  19
  20 /*
  21  * This table stores info about all the built-in functions (ie, functions
  22  * that are compiled into the Postgres executable).
  23  */
  24
  25 typedef struct
  26 {
  27         Oid                     foid;                   /* OID of the function */
  28         short           nargs;                  /* 0..FUNC_MAX_ARGS, or -1 if variable count */
  29         bool            strict;                 /* T if function is "strict" */
  30         bool            retset;                 /* T if function returns a set */
  31         const char *funcName;           /* C name of the function */
  32         PGFunction      func;                   /* pointer to compiled function */
  33 } FmgrBuiltin;
  34
  35 extern PGDLLIMPORT const FmgrBuiltin fmgr_builtins[];
  36
  37 extern PGDLLIMPORT const int fmgr_nbuiltins;    /* number of entries in table */
  38
  39 extern PGDLLIMPORT const Oid fmgr_last_builtin_oid; /* highest function OID in
  40                                                                                                          * table */
  41
  42 /*
  43  * Mapping from a builtin function's OID to its index in the fmgr_builtins
  44  * array.  This is indexed from 0 through fmgr_last_builtin_oid.
  45  */
  46 #define InvalidOidBuiltinMapping PG_UINT16_MAX
  47 extern PGDLLIMPORT const uint16 fmgr_builtin_oid_index[];
  48
  49 #endif                                                  /* FMGRTAB_H */