1 /*-------------------------------------------------------------------------
4 * Definitions for the Postgres function manager and function-call
7 * This file must be included by all Postgres modules that either define
8 * or call fmgr-callable functions.
11 * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
12 * Portions Copyright (c) 1994, Regents of the University of California
14 * $PostgreSQL: pgsql/src/include/fmgr.h,v 1.61 2008/12/28 18:54:00 tgl Exp $
16 *-------------------------------------------------------------------------
21 /* We don't want to include primnodes.h here, so make a stub reference */
22 typedef struct Node *fmNodePtr;
24 /* Likewise, avoid including stringinfo.h here */
25 typedef struct StringInfoData *fmStringInfo;
29 * All functions that can be called directly by fmgr must have this signature.
30 * (Other functions can be called by using a handler that does have this
34 typedef struct FunctionCallInfoData *FunctionCallInfo;
36 typedef Datum (*PGFunction) (FunctionCallInfo fcinfo);
39 * This struct holds the system-catalog information that must be looked up
40 * before a function can be called through fmgr. If the same function is
41 * to be called multiple times, the lookup need be done only once and the
42 * info struct saved for re-use.
44 typedef struct FmgrInfo
46 PGFunction fn_addr; /* pointer to function or handler to be called */
47 Oid fn_oid; /* OID of function (NOT of handler, if any) */
48 short fn_nargs; /* 0..FUNC_MAX_ARGS, or -1 if variable arg
50 bool fn_strict; /* function is "strict" (NULL in => NULL out) */
51 bool fn_retset; /* function returns a set */
52 unsigned char fn_stats; /* collect stats if track_functions > this */
53 void *fn_extra; /* extra space for use by handler */
54 MemoryContext fn_mcxt; /* memory context to store fn_extra in */
55 fmNodePtr fn_expr; /* expression parse tree for call, or NULL */
59 * This struct is the data actually passed to an fmgr-called function.
61 typedef struct FunctionCallInfoData
63 FmgrInfo *flinfo; /* ptr to lookup info used for this call */
64 fmNodePtr context; /* pass info about context of call */
65 fmNodePtr resultinfo; /* pass or return extra info about result */
66 bool isnull; /* function must set true if result is NULL */
67 short nargs; /* # arguments actually passed */
68 Datum arg[FUNC_MAX_ARGS]; /* Arguments passed to function */
69 bool argnull[FUNC_MAX_ARGS]; /* T if arg[i] is actually NULL */
70 } FunctionCallInfoData;
73 * This routine fills a FmgrInfo struct, given the OID
74 * of the function to be called.
76 extern void fmgr_info(Oid functionId, FmgrInfo *finfo);
79 * Same, when the FmgrInfo struct is in a memory context longer-lived than
80 * CurrentMemoryContext. The specified context will be set as fn_mcxt
81 * and used to hold all subsidiary data of finfo.
83 extern void fmgr_info_cxt(Oid functionId, FmgrInfo *finfo,
87 * Copy an FmgrInfo struct
89 extern void fmgr_info_copy(FmgrInfo *dstinfo, FmgrInfo *srcinfo,
90 MemoryContext destcxt);
93 * This macro initializes all the fields of a FunctionCallInfoData except
94 * for the arg[] and argnull[] arrays. Performance testing has shown that
95 * the fastest way to set up argnull[] for small numbers of arguments is to
96 * explicitly set each required element to false, so we don't try to zero
97 * out the argnull[] array in the macro.
99 #define InitFunctionCallInfoData(Fcinfo, Flinfo, Nargs, Context, Resultinfo) \
101 (Fcinfo).flinfo = (Flinfo); \
102 (Fcinfo).context = (Context); \
103 (Fcinfo).resultinfo = (Resultinfo); \
104 (Fcinfo).isnull = false; \
105 (Fcinfo).nargs = (Nargs); \
109 * This macro invokes a function given a filled-in FunctionCallInfoData
110 * struct. The macro result is the returned Datum --- but note that
111 * caller must still check fcinfo->isnull! Also, if function is strict,
112 * it is caller's responsibility to verify that no null arguments are present
115 #define FunctionCallInvoke(fcinfo) ((* (fcinfo)->flinfo->fn_addr) (fcinfo))
118 /*-------------------------------------------------------------------------
119 * Support macros to ease writing fmgr-compatible functions
121 * A C-coded fmgr-compatible function should be declared as
124 * function_name(PG_FUNCTION_ARGS)
129 * It should access its arguments using appropriate PG_GETARG_xxx macros
130 * and should return its result using PG_RETURN_xxx.
132 *-------------------------------------------------------------------------
135 /* Standard parameter list for fmgr-compatible functions */
136 #define PG_FUNCTION_ARGS FunctionCallInfo fcinfo
139 * Get number of arguments passed to function.
141 #define PG_NARGS() (fcinfo->nargs)
144 * If function is not marked "proisstrict" in pg_proc, it must check for
145 * null arguments using this macro. Do not try to GETARG a null argument!
147 #define PG_ARGISNULL(n) (fcinfo->argnull[n])
150 * Support for fetching detoasted copies of toastable datatypes (all of
151 * which are varlena types). pg_detoast_datum() gives you either the input
152 * datum (if not toasted) or a detoasted copy allocated with palloc().
153 * pg_detoast_datum_copy() always gives you a palloc'd copy --- use it
154 * if you need a modifiable copy of the input. Caller is expected to have
155 * checked for null inputs first, if necessary.
157 * pg_detoast_datum_packed() will return packed (1-byte header) datums
158 * unmodified. It will still expand an externally toasted or compressed datum.
159 * The resulting datum can be accessed using VARSIZE_ANY() and VARDATA_ANY()
160 * (beware of multiple evaluations in those macros!)
162 * WARNING: It is only safe to use pg_detoast_datum_packed() and
163 * VARDATA_ANY() if you really don't care about the alignment. Either because
164 * you're working with something like text where the alignment doesn't matter
165 * or because you're not going to access its constituent parts and just use
166 * things like memcpy on it anyways.
168 * Note: it'd be nice if these could be macros, but I see no way to do that
169 * without evaluating the arguments multiple times, which is NOT acceptable.
171 extern struct varlena *pg_detoast_datum(struct varlena * datum);
172 extern struct varlena *pg_detoast_datum_copy(struct varlena * datum);
173 extern struct varlena *pg_detoast_datum_slice(struct varlena * datum,
174 int32 first, int32 count);
175 extern struct varlena *pg_detoast_datum_packed(struct varlena * datum);
177 #define PG_DETOAST_DATUM(datum) \
178 pg_detoast_datum((struct varlena *) DatumGetPointer(datum))
179 #define PG_DETOAST_DATUM_COPY(datum) \
180 pg_detoast_datum_copy((struct varlena *) DatumGetPointer(datum))
181 #define PG_DETOAST_DATUM_SLICE(datum,f,c) \
182 pg_detoast_datum_slice((struct varlena *) DatumGetPointer(datum), \
183 (int32) (f), (int32) (c))
184 /* WARNING -- unaligned pointer */
185 #define PG_DETOAST_DATUM_PACKED(datum) \
186 pg_detoast_datum_packed((struct varlena *) DatumGetPointer(datum))
189 * Support for cleaning up detoasted copies of inputs. This must only
190 * be used for pass-by-ref datatypes, and normally would only be used
191 * for toastable types. If the given pointer is different from the
192 * original argument, assume it's a palloc'd detoasted copy, and pfree it.
193 * NOTE: most functions on toastable types do not have to worry about this,
194 * but we currently require that support functions for indexes not leak
197 #define PG_FREE_IF_COPY(ptr,n) \
199 if ((Pointer) (ptr) != PG_GETARG_POINTER(n)) \
203 /* Macros for fetching arguments of standard types */
205 #define PG_GETARG_DATUM(n) (fcinfo->arg[n])
206 #define PG_GETARG_INT32(n) DatumGetInt32(PG_GETARG_DATUM(n))
207 #define PG_GETARG_UINT32(n) DatumGetUInt32(PG_GETARG_DATUM(n))
208 #define PG_GETARG_INT16(n) DatumGetInt16(PG_GETARG_DATUM(n))
209 #define PG_GETARG_UINT16(n) DatumGetUInt16(PG_GETARG_DATUM(n))
210 #define PG_GETARG_CHAR(n) DatumGetChar(PG_GETARG_DATUM(n))
211 #define PG_GETARG_BOOL(n) DatumGetBool(PG_GETARG_DATUM(n))
212 #define PG_GETARG_OID(n) DatumGetObjectId(PG_GETARG_DATUM(n))
213 #define PG_GETARG_POINTER(n) DatumGetPointer(PG_GETARG_DATUM(n))
214 #define PG_GETARG_CSTRING(n) DatumGetCString(PG_GETARG_DATUM(n))
215 #define PG_GETARG_NAME(n) DatumGetName(PG_GETARG_DATUM(n))
216 /* these macros hide the pass-by-reference-ness of the datatype: */
217 #define PG_GETARG_FLOAT4(n) DatumGetFloat4(PG_GETARG_DATUM(n))
218 #define PG_GETARG_FLOAT8(n) DatumGetFloat8(PG_GETARG_DATUM(n))
219 #define PG_GETARG_INT64(n) DatumGetInt64(PG_GETARG_DATUM(n))
220 /* use this if you want the raw, possibly-toasted input datum: */
221 #define PG_GETARG_RAW_VARLENA_P(n) ((struct varlena *) PG_GETARG_POINTER(n))
222 /* use this if you want the input datum de-toasted: */
223 #define PG_GETARG_VARLENA_P(n) PG_DETOAST_DATUM(PG_GETARG_DATUM(n))
224 /* and this if you can handle 1-byte-header datums: */
225 #define PG_GETARG_VARLENA_PP(n) PG_DETOAST_DATUM_PACKED(PG_GETARG_DATUM(n))
226 /* DatumGetFoo macros for varlena types will typically look like this: */
227 #define DatumGetByteaP(X) ((bytea *) PG_DETOAST_DATUM(X))
228 #define DatumGetByteaPP(X) ((bytea *) PG_DETOAST_DATUM_PACKED(X))
229 #define DatumGetTextP(X) ((text *) PG_DETOAST_DATUM(X))
230 #define DatumGetTextPP(X) ((text *) PG_DETOAST_DATUM_PACKED(X))
231 #define DatumGetBpCharP(X) ((BpChar *) PG_DETOAST_DATUM(X))
232 #define DatumGetBpCharPP(X) ((BpChar *) PG_DETOAST_DATUM_PACKED(X))
233 #define DatumGetVarCharP(X) ((VarChar *) PG_DETOAST_DATUM(X))
234 #define DatumGetVarCharPP(X) ((VarChar *) PG_DETOAST_DATUM_PACKED(X))
235 #define DatumGetHeapTupleHeader(X) ((HeapTupleHeader) PG_DETOAST_DATUM(X))
236 /* And we also offer variants that return an OK-to-write copy */
237 #define DatumGetByteaPCopy(X) ((bytea *) PG_DETOAST_DATUM_COPY(X))
238 #define DatumGetTextPCopy(X) ((text *) PG_DETOAST_DATUM_COPY(X))
239 #define DatumGetBpCharPCopy(X) ((BpChar *) PG_DETOAST_DATUM_COPY(X))
240 #define DatumGetVarCharPCopy(X) ((VarChar *) PG_DETOAST_DATUM_COPY(X))
241 #define DatumGetHeapTupleHeaderCopy(X) ((HeapTupleHeader) PG_DETOAST_DATUM_COPY(X))
242 /* Variants which return n bytes starting at pos. m */
243 #define DatumGetByteaPSlice(X,m,n) ((bytea *) PG_DETOAST_DATUM_SLICE(X,m,n))
244 #define DatumGetTextPSlice(X,m,n) ((text *) PG_DETOAST_DATUM_SLICE(X,m,n))
245 #define DatumGetBpCharPSlice(X,m,n) ((BpChar *) PG_DETOAST_DATUM_SLICE(X,m,n))
246 #define DatumGetVarCharPSlice(X,m,n) ((VarChar *) PG_DETOAST_DATUM_SLICE(X,m,n))
247 /* GETARG macros for varlena types will typically look like this: */
248 #define PG_GETARG_BYTEA_P(n) DatumGetByteaP(PG_GETARG_DATUM(n))
249 #define PG_GETARG_BYTEA_PP(n) DatumGetByteaPP(PG_GETARG_DATUM(n))
250 #define PG_GETARG_TEXT_P(n) DatumGetTextP(PG_GETARG_DATUM(n))
251 #define PG_GETARG_TEXT_PP(n) DatumGetTextPP(PG_GETARG_DATUM(n))
252 #define PG_GETARG_BPCHAR_P(n) DatumGetBpCharP(PG_GETARG_DATUM(n))
253 #define PG_GETARG_BPCHAR_PP(n) DatumGetBpCharPP(PG_GETARG_DATUM(n))
254 #define PG_GETARG_VARCHAR_P(n) DatumGetVarCharP(PG_GETARG_DATUM(n))
255 #define PG_GETARG_VARCHAR_PP(n) DatumGetVarCharPP(PG_GETARG_DATUM(n))
256 #define PG_GETARG_HEAPTUPLEHEADER(n) DatumGetHeapTupleHeader(PG_GETARG_DATUM(n))
257 /* And we also offer variants that return an OK-to-write copy */
258 #define PG_GETARG_BYTEA_P_COPY(n) DatumGetByteaPCopy(PG_GETARG_DATUM(n))
259 #define PG_GETARG_TEXT_P_COPY(n) DatumGetTextPCopy(PG_GETARG_DATUM(n))
260 #define PG_GETARG_BPCHAR_P_COPY(n) DatumGetBpCharPCopy(PG_GETARG_DATUM(n))
261 #define PG_GETARG_VARCHAR_P_COPY(n) DatumGetVarCharPCopy(PG_GETARG_DATUM(n))
262 #define PG_GETARG_HEAPTUPLEHEADER_COPY(n) DatumGetHeapTupleHeaderCopy(PG_GETARG_DATUM(n))
263 /* And a b-byte slice from position a -also OK to write */
264 #define PG_GETARG_BYTEA_P_SLICE(n,a,b) DatumGetByteaPSlice(PG_GETARG_DATUM(n),a,b)
265 #define PG_GETARG_TEXT_P_SLICE(n,a,b) DatumGetTextPSlice(PG_GETARG_DATUM(n),a,b)
266 #define PG_GETARG_BPCHAR_P_SLICE(n,a,b) DatumGetBpCharPSlice(PG_GETARG_DATUM(n),a,b)
267 #define PG_GETARG_VARCHAR_P_SLICE(n,a,b) DatumGetVarCharPSlice(PG_GETARG_DATUM(n),a,b)
269 /* To return a NULL do this: */
270 #define PG_RETURN_NULL() \
271 do { fcinfo->isnull = true; return (Datum) 0; } while (0)
273 /* A few internal functions return void (which is not the same as NULL!) */
274 #define PG_RETURN_VOID() return (Datum) 0
276 /* Macros for returning results of standard types */
278 #define PG_RETURN_DATUM(x) return (x)
279 #define PG_RETURN_INT32(x) return Int32GetDatum(x)
280 #define PG_RETURN_UINT32(x) return UInt32GetDatum(x)
281 #define PG_RETURN_INT16(x) return Int16GetDatum(x)
282 #define PG_RETURN_CHAR(x) return CharGetDatum(x)
283 #define PG_RETURN_BOOL(x) return BoolGetDatum(x)
284 #define PG_RETURN_OID(x) return ObjectIdGetDatum(x)
285 #define PG_RETURN_POINTER(x) return PointerGetDatum(x)
286 #define PG_RETURN_CSTRING(x) return CStringGetDatum(x)
287 #define PG_RETURN_NAME(x) return NameGetDatum(x)
288 /* these macros hide the pass-by-reference-ness of the datatype: */
289 #define PG_RETURN_FLOAT4(x) return Float4GetDatum(x)
290 #define PG_RETURN_FLOAT8(x) return Float8GetDatum(x)
291 #define PG_RETURN_INT64(x) return Int64GetDatum(x)
292 /* RETURN macros for other pass-by-ref types will typically look like this: */
293 #define PG_RETURN_BYTEA_P(x) PG_RETURN_POINTER(x)
294 #define PG_RETURN_TEXT_P(x) PG_RETURN_POINTER(x)
295 #define PG_RETURN_BPCHAR_P(x) PG_RETURN_POINTER(x)
296 #define PG_RETURN_VARCHAR_P(x) PG_RETURN_POINTER(x)
297 #define PG_RETURN_HEAPTUPLEHEADER(x) PG_RETURN_POINTER(x)
300 /*-------------------------------------------------------------------------
301 * Support for detecting call convention of dynamically-loaded functions
303 * Dynamically loaded functions may use either the version-1 ("new style")
304 * or version-0 ("old style") calling convention. Version 1 is the call
305 * convention defined in this header file; version 0 is the old "plain C"
306 * convention. A version-1 function must be accompanied by the macro call
308 * PG_FUNCTION_INFO_V1(function_name);
310 * Note that internal functions do not need this decoration since they are
311 * assumed to be version-1.
313 *-------------------------------------------------------------------------
318 int api_version; /* specifies call convention version number */
319 /* More fields may be added later, for version numbers > 1. */
322 /* Expected signature of an info function */
323 typedef const Pg_finfo_record *(*PGFInfoFunction) (void);
326 * Macro to build an info function associated with the given function name.
327 * Win32 loadable functions usually link with 'dlltool --export-all', but it
328 * doesn't hurt to add PGDLLIMPORT in case they don't.
330 #define PG_FUNCTION_INFO_V1(funcname) \
331 extern PGDLLIMPORT const Pg_finfo_record * CppConcat(pg_finfo_,funcname)(void); \
332 const Pg_finfo_record * \
333 CppConcat(pg_finfo_,funcname) (void) \
335 static const Pg_finfo_record my_finfo = { 1 }; \
338 extern int no_such_variable
341 /*-------------------------------------------------------------------------
342 * Support for verifying backend compatibility of loaded modules
344 * We require dynamically-loaded modules to include the macro call
346 * so that we can check for obvious incompatibility, such as being compiled
347 * for a different major PostgreSQL version.
349 * To compile with versions of PostgreSQL that do not support this,
350 * you may put an #ifdef/#endif test around it. Note that in a multiple-
351 * source-file module, the macro call should only appear once.
353 * The specific items included in the magic block are intended to be ones that
354 * are custom-configurable and especially likely to break dynamically loaded
355 * modules if they were compiled with other values. Also, the length field
356 * can be used to detect definition changes.
358 * Note: we compare magic blocks with memcmp(), so there had better not be
359 * any alignment pad bytes in them.
361 * Note: when changing the contents of magic blocks, be sure to adjust the
362 * incompatible_module_error() function in dfmgr.c.
363 *-------------------------------------------------------------------------
366 /* Definition of the magic block structure */
369 int len; /* sizeof(this struct) */
370 int version; /* PostgreSQL major version */
371 int funcmaxargs; /* FUNC_MAX_ARGS */
372 int indexmaxkeys; /* INDEX_MAX_KEYS */
373 int namedatalen; /* NAMEDATALEN */
374 int float4byval; /* FLOAT4PASSBYVAL */
375 int float8byval; /* FLOAT8PASSBYVAL */
378 /* The actual data block contents */
379 #define PG_MODULE_MAGIC_DATA \
381 sizeof(Pg_magic_struct), \
382 PG_VERSION_NUM / 100, \
391 * Declare the module magic function. It needs to be a function as the dlsym
392 * in the backend is only guaranteed to work on functions, not data
394 typedef const Pg_magic_struct *(*PGModuleMagicFunction) (void);
396 #define PG_MAGIC_FUNCTION_NAME Pg_magic_func
397 #define PG_MAGIC_FUNCTION_NAME_STRING "Pg_magic_func"
399 #define PG_MODULE_MAGIC \
400 extern PGDLLIMPORT const Pg_magic_struct *PG_MAGIC_FUNCTION_NAME(void); \
401 const Pg_magic_struct * \
402 PG_MAGIC_FUNCTION_NAME(void) \
404 static const Pg_magic_struct Pg_magic_data = PG_MODULE_MAGIC_DATA; \
405 return &Pg_magic_data; \
407 extern int no_such_variable
410 /*-------------------------------------------------------------------------
411 * Support routines and macros for callers of fmgr-compatible functions
412 *-------------------------------------------------------------------------
415 /* These are for invocation of a specifically named function with a
416 * directly-computed parameter list. Note that neither arguments nor result
417 * are allowed to be NULL.
419 extern Datum DirectFunctionCall1(PGFunction func, Datum arg1);
420 extern Datum DirectFunctionCall2(PGFunction func, Datum arg1, Datum arg2);
421 extern Datum DirectFunctionCall3(PGFunction func, Datum arg1, Datum arg2,
423 extern Datum DirectFunctionCall4(PGFunction func, Datum arg1, Datum arg2,
424 Datum arg3, Datum arg4);
425 extern Datum DirectFunctionCall5(PGFunction func, Datum arg1, Datum arg2,
426 Datum arg3, Datum arg4, Datum arg5);
427 extern Datum DirectFunctionCall6(PGFunction func, Datum arg1, Datum arg2,
428 Datum arg3, Datum arg4, Datum arg5,
430 extern Datum DirectFunctionCall7(PGFunction func, Datum arg1, Datum arg2,
431 Datum arg3, Datum arg4, Datum arg5,
432 Datum arg6, Datum arg7);
433 extern Datum DirectFunctionCall8(PGFunction func, Datum arg1, Datum arg2,
434 Datum arg3, Datum arg4, Datum arg5,
435 Datum arg6, Datum arg7, Datum arg8);
436 extern Datum DirectFunctionCall9(PGFunction func, Datum arg1, Datum arg2,
437 Datum arg3, Datum arg4, Datum arg5,
438 Datum arg6, Datum arg7, Datum arg8,
441 /* These are for invocation of a previously-looked-up function with a
442 * directly-computed parameter list. Note that neither arguments nor result
443 * are allowed to be NULL.
445 extern Datum FunctionCall1(FmgrInfo *flinfo, Datum arg1);
446 extern Datum FunctionCall2(FmgrInfo *flinfo, Datum arg1, Datum arg2);
447 extern Datum FunctionCall3(FmgrInfo *flinfo, Datum arg1, Datum arg2,
449 extern Datum FunctionCall4(FmgrInfo *flinfo, Datum arg1, Datum arg2,
450 Datum arg3, Datum arg4);
451 extern Datum FunctionCall5(FmgrInfo *flinfo, Datum arg1, Datum arg2,
452 Datum arg3, Datum arg4, Datum arg5);
453 extern Datum FunctionCall6(FmgrInfo *flinfo, Datum arg1, Datum arg2,
454 Datum arg3, Datum arg4, Datum arg5,
456 extern Datum FunctionCall7(FmgrInfo *flinfo, Datum arg1, Datum arg2,
457 Datum arg3, Datum arg4, Datum arg5,
458 Datum arg6, Datum arg7);
459 extern Datum FunctionCall8(FmgrInfo *flinfo, Datum arg1, Datum arg2,
460 Datum arg3, Datum arg4, Datum arg5,
461 Datum arg6, Datum arg7, Datum arg8);
462 extern Datum FunctionCall9(FmgrInfo *flinfo, Datum arg1, Datum arg2,
463 Datum arg3, Datum arg4, Datum arg5,
464 Datum arg6, Datum arg7, Datum arg8,
467 /* These are for invocation of a function identified by OID with a
468 * directly-computed parameter list. Note that neither arguments nor result
469 * are allowed to be NULL. These are essentially FunctionLookup() followed
470 * by FunctionCallN(). If the same function is to be invoked repeatedly,
471 * do the FunctionLookup() once and then use FunctionCallN().
473 extern Datum OidFunctionCall1(Oid functionId, Datum arg1);
474 extern Datum OidFunctionCall2(Oid functionId, Datum arg1, Datum arg2);
475 extern Datum OidFunctionCall3(Oid functionId, Datum arg1, Datum arg2,
477 extern Datum OidFunctionCall4(Oid functionId, Datum arg1, Datum arg2,
478 Datum arg3, Datum arg4);
479 extern Datum OidFunctionCall5(Oid functionId, Datum arg1, Datum arg2,
480 Datum arg3, Datum arg4, Datum arg5);
481 extern Datum OidFunctionCall6(Oid functionId, Datum arg1, Datum arg2,
482 Datum arg3, Datum arg4, Datum arg5,
484 extern Datum OidFunctionCall7(Oid functionId, Datum arg1, Datum arg2,
485 Datum arg3, Datum arg4, Datum arg5,
486 Datum arg6, Datum arg7);
487 extern Datum OidFunctionCall8(Oid functionId, Datum arg1, Datum arg2,
488 Datum arg3, Datum arg4, Datum arg5,
489 Datum arg6, Datum arg7, Datum arg8);
490 extern Datum OidFunctionCall9(Oid functionId, Datum arg1, Datum arg2,
491 Datum arg3, Datum arg4, Datum arg5,
492 Datum arg6, Datum arg7, Datum arg8,
495 /* Special cases for convenient invocation of datatype I/O functions. */
496 extern Datum InputFunctionCall(FmgrInfo *flinfo, char *str,
497 Oid typioparam, int32 typmod);
498 extern Datum OidInputFunctionCall(Oid functionId, char *str,
499 Oid typioparam, int32 typmod);
500 extern char *OutputFunctionCall(FmgrInfo *flinfo, Datum val);
501 extern char *OidOutputFunctionCall(Oid functionId, Datum val);
502 extern Datum ReceiveFunctionCall(FmgrInfo *flinfo, fmStringInfo buf,
503 Oid typioparam, int32 typmod);
504 extern Datum OidReceiveFunctionCall(Oid functionId, fmStringInfo buf,
505 Oid typioparam, int32 typmod);
506 extern bytea *SendFunctionCall(FmgrInfo *flinfo, Datum val);
507 extern bytea *OidSendFunctionCall(Oid functionId, Datum val);
513 extern const Pg_finfo_record *fetch_finfo_record(void *filehandle, char *funcname);
514 extern void clear_external_function_hash(void *filehandle);
515 extern Oid fmgr_internal_function(const char *proname);
516 extern Oid get_fn_expr_rettype(FmgrInfo *flinfo);
517 extern Oid get_fn_expr_argtype(FmgrInfo *flinfo, int argnum);
518 extern Oid get_call_expr_argtype(fmNodePtr expr, int argnum);
519 extern bool get_fn_expr_arg_stable(FmgrInfo *flinfo, int argnum);
520 extern bool get_call_expr_arg_stable(fmNodePtr expr, int argnum);
523 * Routines in dfmgr.c
525 extern char *Dynamic_library_path;
527 extern PGFunction load_external_function(char *filename, char *funcname,
528 bool signalNotFound, void **filehandle);
529 extern PGFunction lookup_external_function(void *filehandle, char *funcname);
530 extern void load_file(const char *filename, bool restricted);
531 extern void **find_rendezvous_variable(const char *varName);
535 * !!! OLD INTERFACE !!!
537 * fmgr() is the only remaining vestige of the old-style caller support
538 * functions. It's no longer used anywhere in the Postgres distribution,
539 * but we should leave it around for a release or two to ease the transition
540 * for user-supplied C functions. OidFunctionCallN() replaces it for new
545 * DEPRECATED, DO NOT USE IN NEW CODE
547 extern char *fmgr(Oid procedureId,...);