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) 1996-2013, PostgreSQL Global Development Group
12 * Portions Copyright (c) 1994, Regents of the University of California
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 * Note that fn_expr really is parse-time-determined information about the
45 * arguments, rather than about the function itself. But it's convenient
46 * to store it here rather than in FunctionCallInfoData, where it might more
49 typedef struct FmgrInfo
51 PGFunction fn_addr; /* pointer to function or handler to be called */
52 Oid fn_oid; /* OID of function (NOT of handler, if any) */
53 short fn_nargs; /* 0..FUNC_MAX_ARGS, or -1 if variable arg
55 bool fn_strict; /* function is "strict" (NULL in => NULL out) */
56 bool fn_retset; /* function returns a set */
57 unsigned char fn_stats; /* collect stats if track_functions > this */
58 void *fn_extra; /* extra space for use by handler */
59 MemoryContext fn_mcxt; /* memory context to store fn_extra in */
60 fmNodePtr fn_expr; /* expression parse tree for call, or NULL */
64 * This struct is the data actually passed to an fmgr-called function.
66 typedef struct FunctionCallInfoData
68 FmgrInfo *flinfo; /* ptr to lookup info used for this call */
69 fmNodePtr context; /* pass info about context of call */
70 fmNodePtr resultinfo; /* pass or return extra info about result */
71 Oid fncollation; /* collation for function to use */
72 bool isnull; /* function must set true if result is NULL */
73 short nargs; /* # arguments actually passed */
74 Datum arg[FUNC_MAX_ARGS]; /* Arguments passed to function */
75 bool argnull[FUNC_MAX_ARGS]; /* T if arg[i] is actually NULL */
76 } FunctionCallInfoData;
79 * This routine fills a FmgrInfo struct, given the OID
80 * of the function to be called.
82 extern void fmgr_info(Oid functionId, FmgrInfo *finfo);
85 * Same, when the FmgrInfo struct is in a memory context longer-lived than
86 * CurrentMemoryContext. The specified context will be set as fn_mcxt
87 * and used to hold all subsidiary data of finfo.
89 extern void fmgr_info_cxt(Oid functionId, FmgrInfo *finfo,
92 /* Convenience macro for setting the fn_expr field */
93 #define fmgr_info_set_expr(expr, finfo) \
94 ((finfo)->fn_expr = (expr))
97 * Copy an FmgrInfo struct
99 extern void fmgr_info_copy(FmgrInfo *dstinfo, FmgrInfo *srcinfo,
100 MemoryContext destcxt);
103 * This macro initializes all the fields of a FunctionCallInfoData except
104 * for the arg[] and argnull[] arrays. Performance testing has shown that
105 * the fastest way to set up argnull[] for small numbers of arguments is to
106 * explicitly set each required element to false, so we don't try to zero
107 * out the argnull[] array in the macro.
109 #define InitFunctionCallInfoData(Fcinfo, Flinfo, Nargs, Collation, Context, Resultinfo) \
111 (Fcinfo).flinfo = (Flinfo); \
112 (Fcinfo).context = (Context); \
113 (Fcinfo).resultinfo = (Resultinfo); \
114 (Fcinfo).fncollation = (Collation); \
115 (Fcinfo).isnull = false; \
116 (Fcinfo).nargs = (Nargs); \
120 * This macro invokes a function given a filled-in FunctionCallInfoData
121 * struct. The macro result is the returned Datum --- but note that
122 * caller must still check fcinfo->isnull! Also, if function is strict,
123 * it is caller's responsibility to verify that no null arguments are present
126 #define FunctionCallInvoke(fcinfo) ((* (fcinfo)->flinfo->fn_addr) (fcinfo))
129 /*-------------------------------------------------------------------------
130 * Support macros to ease writing fmgr-compatible functions
132 * A C-coded fmgr-compatible function should be declared as
135 * function_name(PG_FUNCTION_ARGS)
140 * It should access its arguments using appropriate PG_GETARG_xxx macros
141 * and should return its result using PG_RETURN_xxx.
143 *-------------------------------------------------------------------------
146 /* Standard parameter list for fmgr-compatible functions */
147 #define PG_FUNCTION_ARGS FunctionCallInfo fcinfo
150 * Get collation function should use.
152 #define PG_GET_COLLATION() (fcinfo->fncollation)
155 * Get number of arguments passed to function.
157 #define PG_NARGS() (fcinfo->nargs)
160 * If function is not marked "proisstrict" in pg_proc, it must check for
161 * null arguments using this macro. Do not try to GETARG a null argument!
163 #define PG_ARGISNULL(n) (fcinfo->argnull[n])
166 * Support for fetching detoasted copies of toastable datatypes (all of
167 * which are varlena types). pg_detoast_datum() gives you either the input
168 * datum (if not toasted) or a detoasted copy allocated with palloc().
169 * pg_detoast_datum_copy() always gives you a palloc'd copy --- use it
170 * if you need a modifiable copy of the input. Caller is expected to have
171 * checked for null inputs first, if necessary.
173 * pg_detoast_datum_packed() will return packed (1-byte header) datums
174 * unmodified. It will still expand an externally toasted or compressed datum.
175 * The resulting datum can be accessed using VARSIZE_ANY() and VARDATA_ANY()
176 * (beware of multiple evaluations in those macros!)
178 * WARNING: It is only safe to use pg_detoast_datum_packed() and
179 * VARDATA_ANY() if you really don't care about the alignment. Either because
180 * you're working with something like text where the alignment doesn't matter
181 * or because you're not going to access its constituent parts and just use
182 * things like memcpy on it anyways.
184 * Note: it'd be nice if these could be macros, but I see no way to do that
185 * without evaluating the arguments multiple times, which is NOT acceptable.
187 extern struct varlena *pg_detoast_datum(struct varlena * datum);
188 extern struct varlena *pg_detoast_datum_copy(struct varlena * datum);
189 extern struct varlena *pg_detoast_datum_slice(struct varlena * datum,
190 int32 first, int32 count);
191 extern struct varlena *pg_detoast_datum_packed(struct varlena * datum);
193 #define PG_DETOAST_DATUM(datum) \
194 pg_detoast_datum((struct varlena *) DatumGetPointer(datum))
195 #define PG_DETOAST_DATUM_COPY(datum) \
196 pg_detoast_datum_copy((struct varlena *) DatumGetPointer(datum))
197 #define PG_DETOAST_DATUM_SLICE(datum,f,c) \
198 pg_detoast_datum_slice((struct varlena *) DatumGetPointer(datum), \
199 (int32) (f), (int32) (c))
200 /* WARNING -- unaligned pointer */
201 #define PG_DETOAST_DATUM_PACKED(datum) \
202 pg_detoast_datum_packed((struct varlena *) DatumGetPointer(datum))
205 * Support for cleaning up detoasted copies of inputs. This must only
206 * be used for pass-by-ref datatypes, and normally would only be used
207 * for toastable types. If the given pointer is different from the
208 * original argument, assume it's a palloc'd detoasted copy, and pfree it.
209 * NOTE: most functions on toastable types do not have to worry about this,
210 * but we currently require that support functions for indexes not leak
213 #define PG_FREE_IF_COPY(ptr,n) \
215 if ((Pointer) (ptr) != PG_GETARG_POINTER(n)) \
219 /* Macros for fetching arguments of standard types */
221 #define PG_GETARG_DATUM(n) (fcinfo->arg[n])
222 #define PG_GETARG_INT32(n) DatumGetInt32(PG_GETARG_DATUM(n))
223 #define PG_GETARG_UINT32(n) DatumGetUInt32(PG_GETARG_DATUM(n))
224 #define PG_GETARG_INT16(n) DatumGetInt16(PG_GETARG_DATUM(n))
225 #define PG_GETARG_UINT16(n) DatumGetUInt16(PG_GETARG_DATUM(n))
226 #define PG_GETARG_CHAR(n) DatumGetChar(PG_GETARG_DATUM(n))
227 #define PG_GETARG_BOOL(n) DatumGetBool(PG_GETARG_DATUM(n))
228 #define PG_GETARG_OID(n) DatumGetObjectId(PG_GETARG_DATUM(n))
229 #define PG_GETARG_POINTER(n) DatumGetPointer(PG_GETARG_DATUM(n))
230 #define PG_GETARG_CSTRING(n) DatumGetCString(PG_GETARG_DATUM(n))
231 #define PG_GETARG_NAME(n) DatumGetName(PG_GETARG_DATUM(n))
232 /* these macros hide the pass-by-reference-ness of the datatype: */
233 #define PG_GETARG_FLOAT4(n) DatumGetFloat4(PG_GETARG_DATUM(n))
234 #define PG_GETARG_FLOAT8(n) DatumGetFloat8(PG_GETARG_DATUM(n))
235 #define PG_GETARG_INT64(n) DatumGetInt64(PG_GETARG_DATUM(n))
236 /* use this if you want the raw, possibly-toasted input datum: */
237 #define PG_GETARG_RAW_VARLENA_P(n) ((struct varlena *) PG_GETARG_POINTER(n))
238 /* use this if you want the input datum de-toasted: */
239 #define PG_GETARG_VARLENA_P(n) PG_DETOAST_DATUM(PG_GETARG_DATUM(n))
240 /* and this if you can handle 1-byte-header datums: */
241 #define PG_GETARG_VARLENA_PP(n) PG_DETOAST_DATUM_PACKED(PG_GETARG_DATUM(n))
242 /* DatumGetFoo macros for varlena types will typically look like this: */
243 #define DatumGetByteaP(X) ((bytea *) PG_DETOAST_DATUM(X))
244 #define DatumGetByteaPP(X) ((bytea *) PG_DETOAST_DATUM_PACKED(X))
245 #define DatumGetTextP(X) ((text *) PG_DETOAST_DATUM(X))
246 #define DatumGetTextPP(X) ((text *) PG_DETOAST_DATUM_PACKED(X))
247 #define DatumGetBpCharP(X) ((BpChar *) PG_DETOAST_DATUM(X))
248 #define DatumGetBpCharPP(X) ((BpChar *) PG_DETOAST_DATUM_PACKED(X))
249 #define DatumGetVarCharP(X) ((VarChar *) PG_DETOAST_DATUM(X))
250 #define DatumGetVarCharPP(X) ((VarChar *) PG_DETOAST_DATUM_PACKED(X))
251 #define DatumGetHeapTupleHeader(X) ((HeapTupleHeader) PG_DETOAST_DATUM(X))
252 /* And we also offer variants that return an OK-to-write copy */
253 #define DatumGetByteaPCopy(X) ((bytea *) PG_DETOAST_DATUM_COPY(X))
254 #define DatumGetTextPCopy(X) ((text *) PG_DETOAST_DATUM_COPY(X))
255 #define DatumGetBpCharPCopy(X) ((BpChar *) PG_DETOAST_DATUM_COPY(X))
256 #define DatumGetVarCharPCopy(X) ((VarChar *) PG_DETOAST_DATUM_COPY(X))
257 #define DatumGetHeapTupleHeaderCopy(X) ((HeapTupleHeader) PG_DETOAST_DATUM_COPY(X))
258 /* Variants which return n bytes starting at pos. m */
259 #define DatumGetByteaPSlice(X,m,n) ((bytea *) PG_DETOAST_DATUM_SLICE(X,m,n))
260 #define DatumGetTextPSlice(X,m,n) ((text *) PG_DETOAST_DATUM_SLICE(X,m,n))
261 #define DatumGetBpCharPSlice(X,m,n) ((BpChar *) PG_DETOAST_DATUM_SLICE(X,m,n))
262 #define DatumGetVarCharPSlice(X,m,n) ((VarChar *) PG_DETOAST_DATUM_SLICE(X,m,n))
263 /* GETARG macros for varlena types will typically look like this: */
264 #define PG_GETARG_BYTEA_P(n) DatumGetByteaP(PG_GETARG_DATUM(n))
265 #define PG_GETARG_BYTEA_PP(n) DatumGetByteaPP(PG_GETARG_DATUM(n))
266 #define PG_GETARG_TEXT_P(n) DatumGetTextP(PG_GETARG_DATUM(n))
267 #define PG_GETARG_TEXT_PP(n) DatumGetTextPP(PG_GETARG_DATUM(n))
268 #define PG_GETARG_BPCHAR_P(n) DatumGetBpCharP(PG_GETARG_DATUM(n))
269 #define PG_GETARG_BPCHAR_PP(n) DatumGetBpCharPP(PG_GETARG_DATUM(n))
270 #define PG_GETARG_VARCHAR_P(n) DatumGetVarCharP(PG_GETARG_DATUM(n))
271 #define PG_GETARG_VARCHAR_PP(n) DatumGetVarCharPP(PG_GETARG_DATUM(n))
272 #define PG_GETARG_HEAPTUPLEHEADER(n) DatumGetHeapTupleHeader(PG_GETARG_DATUM(n))
273 /* And we also offer variants that return an OK-to-write copy */
274 #define PG_GETARG_BYTEA_P_COPY(n) DatumGetByteaPCopy(PG_GETARG_DATUM(n))
275 #define PG_GETARG_TEXT_P_COPY(n) DatumGetTextPCopy(PG_GETARG_DATUM(n))
276 #define PG_GETARG_BPCHAR_P_COPY(n) DatumGetBpCharPCopy(PG_GETARG_DATUM(n))
277 #define PG_GETARG_VARCHAR_P_COPY(n) DatumGetVarCharPCopy(PG_GETARG_DATUM(n))
278 #define PG_GETARG_HEAPTUPLEHEADER_COPY(n) DatumGetHeapTupleHeaderCopy(PG_GETARG_DATUM(n))
279 /* And a b-byte slice from position a -also OK to write */
280 #define PG_GETARG_BYTEA_P_SLICE(n,a,b) DatumGetByteaPSlice(PG_GETARG_DATUM(n),a,b)
281 #define PG_GETARG_TEXT_P_SLICE(n,a,b) DatumGetTextPSlice(PG_GETARG_DATUM(n),a,b)
282 #define PG_GETARG_BPCHAR_P_SLICE(n,a,b) DatumGetBpCharPSlice(PG_GETARG_DATUM(n),a,b)
283 #define PG_GETARG_VARCHAR_P_SLICE(n,a,b) DatumGetVarCharPSlice(PG_GETARG_DATUM(n),a,b)
285 /* To return a NULL do this: */
286 #define PG_RETURN_NULL() \
287 do { fcinfo->isnull = true; return (Datum) 0; } while (0)
289 /* A few internal functions return void (which is not the same as NULL!) */
290 #define PG_RETURN_VOID() return (Datum) 0
292 /* Macros for returning results of standard types */
294 #define PG_RETURN_DATUM(x) return (x)
295 #define PG_RETURN_INT32(x) return Int32GetDatum(x)
296 #define PG_RETURN_UINT32(x) return UInt32GetDatum(x)
297 #define PG_RETURN_INT16(x) return Int16GetDatum(x)
298 #define PG_RETURN_CHAR(x) return CharGetDatum(x)
299 #define PG_RETURN_BOOL(x) return BoolGetDatum(x)
300 #define PG_RETURN_OID(x) return ObjectIdGetDatum(x)
301 #define PG_RETURN_POINTER(x) return PointerGetDatum(x)
302 #define PG_RETURN_CSTRING(x) return CStringGetDatum(x)
303 #define PG_RETURN_NAME(x) return NameGetDatum(x)
304 /* these macros hide the pass-by-reference-ness of the datatype: */
305 #define PG_RETURN_FLOAT4(x) return Float4GetDatum(x)
306 #define PG_RETURN_FLOAT8(x) return Float8GetDatum(x)
307 #define PG_RETURN_INT64(x) return Int64GetDatum(x)
308 /* RETURN macros for other pass-by-ref types will typically look like this: */
309 #define PG_RETURN_BYTEA_P(x) PG_RETURN_POINTER(x)
310 #define PG_RETURN_TEXT_P(x) PG_RETURN_POINTER(x)
311 #define PG_RETURN_BPCHAR_P(x) PG_RETURN_POINTER(x)
312 #define PG_RETURN_VARCHAR_P(x) PG_RETURN_POINTER(x)
313 #define PG_RETURN_HEAPTUPLEHEADER(x) PG_RETURN_POINTER(x)
316 /*-------------------------------------------------------------------------
317 * Support for detecting call convention of dynamically-loaded functions
319 * Dynamically loaded functions may use either the version-1 ("new style")
320 * or version-0 ("old style") calling convention. Version 1 is the call
321 * convention defined in this header file; version 0 is the old "plain C"
322 * convention. A version-1 function must be accompanied by the macro call
324 * PG_FUNCTION_INFO_V1(function_name);
326 * Note that internal functions do not need this decoration since they are
327 * assumed to be version-1.
329 *-------------------------------------------------------------------------
334 int api_version; /* specifies call convention version number */
335 /* More fields may be added later, for version numbers > 1. */
338 /* Expected signature of an info function */
339 typedef const Pg_finfo_record *(*PGFInfoFunction) (void);
342 * Macro to build an info function associated with the given function name.
343 * Win32 loadable functions usually link with 'dlltool --export-all', but it
344 * doesn't hurt to add PGDLLIMPORT in case they don't.
346 #define PG_FUNCTION_INFO_V1(funcname) \
347 extern PGDLLEXPORT const Pg_finfo_record * CppConcat(pg_finfo_,funcname)(void); \
348 const Pg_finfo_record * \
349 CppConcat(pg_finfo_,funcname) (void) \
351 static const Pg_finfo_record my_finfo = { 1 }; \
354 extern int no_such_variable
357 /*-------------------------------------------------------------------------
358 * Support for verifying backend compatibility of loaded modules
360 * We require dynamically-loaded modules to include the macro call
362 * so that we can check for obvious incompatibility, such as being compiled
363 * for a different major PostgreSQL version.
365 * To compile with versions of PostgreSQL that do not support this,
366 * you may put an #ifdef/#endif test around it. Note that in a multiple-
367 * source-file module, the macro call should only appear once.
369 * The specific items included in the magic block are intended to be ones that
370 * are custom-configurable and especially likely to break dynamically loaded
371 * modules if they were compiled with other values. Also, the length field
372 * can be used to detect definition changes.
374 * Note: we compare magic blocks with memcmp(), so there had better not be
375 * any alignment pad bytes in them.
377 * Note: when changing the contents of magic blocks, be sure to adjust the
378 * incompatible_module_error() function in dfmgr.c.
379 *-------------------------------------------------------------------------
382 /* Definition of the magic block structure */
385 int len; /* sizeof(this struct) */
386 int version; /* PostgreSQL major version */
387 int funcmaxargs; /* FUNC_MAX_ARGS */
388 int indexmaxkeys; /* INDEX_MAX_KEYS */
389 int namedatalen; /* NAMEDATALEN */
390 int float4byval; /* FLOAT4PASSBYVAL */
391 int float8byval; /* FLOAT8PASSBYVAL */
394 /* The actual data block contents */
395 #define PG_MODULE_MAGIC_DATA \
397 sizeof(Pg_magic_struct), \
398 PG_VERSION_NUM / 100, \
407 * Declare the module magic function. It needs to be a function as the dlsym
408 * in the backend is only guaranteed to work on functions, not data
410 typedef const Pg_magic_struct *(*PGModuleMagicFunction) (void);
412 #define PG_MAGIC_FUNCTION_NAME Pg_magic_func
413 #define PG_MAGIC_FUNCTION_NAME_STRING "Pg_magic_func"
415 #define PG_MODULE_MAGIC \
416 extern PGDLLEXPORT const Pg_magic_struct *PG_MAGIC_FUNCTION_NAME(void); \
417 const Pg_magic_struct * \
418 PG_MAGIC_FUNCTION_NAME(void) \
420 static const Pg_magic_struct Pg_magic_data = PG_MODULE_MAGIC_DATA; \
421 return &Pg_magic_data; \
423 extern int no_such_variable
426 /*-------------------------------------------------------------------------
427 * Support routines and macros for callers of fmgr-compatible functions
428 *-------------------------------------------------------------------------
431 /* These are for invocation of a specifically named function with a
432 * directly-computed parameter list. Note that neither arguments nor result
433 * are allowed to be NULL.
435 extern Datum DirectFunctionCall1Coll(PGFunction func, Oid collation,
437 extern Datum DirectFunctionCall2Coll(PGFunction func, Oid collation,
438 Datum arg1, Datum arg2);
439 extern Datum DirectFunctionCall3Coll(PGFunction func, Oid collation,
440 Datum arg1, Datum arg2,
442 extern Datum DirectFunctionCall4Coll(PGFunction func, Oid collation,
443 Datum arg1, Datum arg2,
444 Datum arg3, Datum arg4);
445 extern Datum DirectFunctionCall5Coll(PGFunction func, Oid collation,
446 Datum arg1, Datum arg2,
447 Datum arg3, Datum arg4, Datum arg5);
448 extern Datum DirectFunctionCall6Coll(PGFunction func, Oid collation,
449 Datum arg1, Datum arg2,
450 Datum arg3, Datum arg4, Datum arg5,
452 extern Datum DirectFunctionCall7Coll(PGFunction func, Oid collation,
453 Datum arg1, Datum arg2,
454 Datum arg3, Datum arg4, Datum arg5,
455 Datum arg6, Datum arg7);
456 extern Datum DirectFunctionCall8Coll(PGFunction func, Oid collation,
457 Datum arg1, Datum arg2,
458 Datum arg3, Datum arg4, Datum arg5,
459 Datum arg6, Datum arg7, Datum arg8);
460 extern Datum DirectFunctionCall9Coll(PGFunction func, Oid collation,
461 Datum arg1, Datum arg2,
462 Datum arg3, Datum arg4, Datum arg5,
463 Datum arg6, Datum arg7, Datum arg8,
466 /* These are for invocation of a previously-looked-up function with a
467 * directly-computed parameter list. Note that neither arguments nor result
468 * are allowed to be NULL.
470 extern Datum FunctionCall1Coll(FmgrInfo *flinfo, Oid collation,
472 extern Datum FunctionCall2Coll(FmgrInfo *flinfo, Oid collation,
473 Datum arg1, Datum arg2);
474 extern Datum FunctionCall3Coll(FmgrInfo *flinfo, Oid collation,
475 Datum arg1, Datum arg2,
477 extern Datum FunctionCall4Coll(FmgrInfo *flinfo, Oid collation,
478 Datum arg1, Datum arg2,
479 Datum arg3, Datum arg4);
480 extern Datum FunctionCall5Coll(FmgrInfo *flinfo, Oid collation,
481 Datum arg1, Datum arg2,
482 Datum arg3, Datum arg4, Datum arg5);
483 extern Datum FunctionCall6Coll(FmgrInfo *flinfo, Oid collation,
484 Datum arg1, Datum arg2,
485 Datum arg3, Datum arg4, Datum arg5,
487 extern Datum FunctionCall7Coll(FmgrInfo *flinfo, Oid collation,
488 Datum arg1, Datum arg2,
489 Datum arg3, Datum arg4, Datum arg5,
490 Datum arg6, Datum arg7);
491 extern Datum FunctionCall8Coll(FmgrInfo *flinfo, Oid collation,
492 Datum arg1, Datum arg2,
493 Datum arg3, Datum arg4, Datum arg5,
494 Datum arg6, Datum arg7, Datum arg8);
495 extern Datum FunctionCall9Coll(FmgrInfo *flinfo, Oid collation,
496 Datum arg1, Datum arg2,
497 Datum arg3, Datum arg4, Datum arg5,
498 Datum arg6, Datum arg7, Datum arg8,
501 /* These are for invocation of a function identified by OID with a
502 * directly-computed parameter list. Note that neither arguments nor result
503 * are allowed to be NULL. These are essentially FunctionLookup() followed
504 * by FunctionCallN(). If the same function is to be invoked repeatedly,
505 * do the FunctionLookup() once and then use FunctionCallN().
507 extern Datum OidFunctionCall0Coll(Oid functionId, Oid collation);
508 extern Datum OidFunctionCall1Coll(Oid functionId, Oid collation,
510 extern Datum OidFunctionCall2Coll(Oid functionId, Oid collation,
511 Datum arg1, Datum arg2);
512 extern Datum OidFunctionCall3Coll(Oid functionId, Oid collation,
513 Datum arg1, Datum arg2,
515 extern Datum OidFunctionCall4Coll(Oid functionId, Oid collation,
516 Datum arg1, Datum arg2,
517 Datum arg3, Datum arg4);
518 extern Datum OidFunctionCall5Coll(Oid functionId, Oid collation,
519 Datum arg1, Datum arg2,
520 Datum arg3, Datum arg4, Datum arg5);
521 extern Datum OidFunctionCall6Coll(Oid functionId, Oid collation,
522 Datum arg1, Datum arg2,
523 Datum arg3, Datum arg4, Datum arg5,
525 extern Datum OidFunctionCall7Coll(Oid functionId, Oid collation,
526 Datum arg1, Datum arg2,
527 Datum arg3, Datum arg4, Datum arg5,
528 Datum arg6, Datum arg7);
529 extern Datum OidFunctionCall8Coll(Oid functionId, Oid collation,
530 Datum arg1, Datum arg2,
531 Datum arg3, Datum arg4, Datum arg5,
532 Datum arg6, Datum arg7, Datum arg8);
533 extern Datum OidFunctionCall9Coll(Oid functionId, Oid collation,
534 Datum arg1, Datum arg2,
535 Datum arg3, Datum arg4, Datum arg5,
536 Datum arg6, Datum arg7, Datum arg8,
539 /* These macros allow the collation argument to be omitted (with a default of
540 * InvalidOid, ie, no collation). They exist mostly for backwards
541 * compatibility of source code.
543 #define DirectFunctionCall1(func, arg1) \
544 DirectFunctionCall1Coll(func, InvalidOid, arg1)
545 #define DirectFunctionCall2(func, arg1, arg2) \
546 DirectFunctionCall2Coll(func, InvalidOid, arg1, arg2)
547 #define DirectFunctionCall3(func, arg1, arg2, arg3) \
548 DirectFunctionCall3Coll(func, InvalidOid, arg1, arg2, arg3)
549 #define DirectFunctionCall4(func, arg1, arg2, arg3, arg4) \
550 DirectFunctionCall4Coll(func, InvalidOid, arg1, arg2, arg3, arg4)
551 #define DirectFunctionCall5(func, arg1, arg2, arg3, arg4, arg5) \
552 DirectFunctionCall5Coll(func, InvalidOid, arg1, arg2, arg3, arg4, arg5)
553 #define DirectFunctionCall6(func, arg1, arg2, arg3, arg4, arg5, arg6) \
554 DirectFunctionCall6Coll(func, InvalidOid, arg1, arg2, arg3, arg4, arg5, arg6)
555 #define DirectFunctionCall7(func, arg1, arg2, arg3, arg4, arg5, arg6, arg7) \
556 DirectFunctionCall7Coll(func, InvalidOid, arg1, arg2, arg3, arg4, arg5, arg6, arg7)
557 #define DirectFunctionCall8(func, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8) \
558 DirectFunctionCall8Coll(func, InvalidOid, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8)
559 #define DirectFunctionCall9(func, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9) \
560 DirectFunctionCall9Coll(func, InvalidOid, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9)
561 #define FunctionCall1(flinfo, arg1) \
562 FunctionCall1Coll(flinfo, InvalidOid, arg1)
563 #define FunctionCall2(flinfo, arg1, arg2) \
564 FunctionCall2Coll(flinfo, InvalidOid, arg1, arg2)
565 #define FunctionCall3(flinfo, arg1, arg2, arg3) \
566 FunctionCall3Coll(flinfo, InvalidOid, arg1, arg2, arg3)
567 #define FunctionCall4(flinfo, arg1, arg2, arg3, arg4) \
568 FunctionCall4Coll(flinfo, InvalidOid, arg1, arg2, arg3, arg4)
569 #define FunctionCall5(flinfo, arg1, arg2, arg3, arg4, arg5) \
570 FunctionCall5Coll(flinfo, InvalidOid, arg1, arg2, arg3, arg4, arg5)
571 #define FunctionCall6(flinfo, arg1, arg2, arg3, arg4, arg5, arg6) \
572 FunctionCall6Coll(flinfo, InvalidOid, arg1, arg2, arg3, arg4, arg5, arg6)
573 #define FunctionCall7(flinfo, arg1, arg2, arg3, arg4, arg5, arg6, arg7) \
574 FunctionCall7Coll(flinfo, InvalidOid, arg1, arg2, arg3, arg4, arg5, arg6, arg7)
575 #define FunctionCall8(flinfo, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8) \
576 FunctionCall8Coll(flinfo, InvalidOid, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8)
577 #define FunctionCall9(flinfo, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9) \
578 FunctionCall9Coll(flinfo, InvalidOid, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9)
579 #define OidFunctionCall0(functionId) \
580 OidFunctionCall0Coll(functionId, InvalidOid)
581 #define OidFunctionCall1(functionId, arg1) \
582 OidFunctionCall1Coll(functionId, InvalidOid, arg1)
583 #define OidFunctionCall2(functionId, arg1, arg2) \
584 OidFunctionCall2Coll(functionId, InvalidOid, arg1, arg2)
585 #define OidFunctionCall3(functionId, arg1, arg2, arg3) \
586 OidFunctionCall3Coll(functionId, InvalidOid, arg1, arg2, arg3)
587 #define OidFunctionCall4(functionId, arg1, arg2, arg3, arg4) \
588 OidFunctionCall4Coll(functionId, InvalidOid, arg1, arg2, arg3, arg4)
589 #define OidFunctionCall5(functionId, arg1, arg2, arg3, arg4, arg5) \
590 OidFunctionCall5Coll(functionId, InvalidOid, arg1, arg2, arg3, arg4, arg5)
591 #define OidFunctionCall6(functionId, arg1, arg2, arg3, arg4, arg5, arg6) \
592 OidFunctionCall6Coll(functionId, InvalidOid, arg1, arg2, arg3, arg4, arg5, arg6)
593 #define OidFunctionCall7(functionId, arg1, arg2, arg3, arg4, arg5, arg6, arg7) \
594 OidFunctionCall7Coll(functionId, InvalidOid, arg1, arg2, arg3, arg4, arg5, arg6, arg7)
595 #define OidFunctionCall8(functionId, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8) \
596 OidFunctionCall8Coll(functionId, InvalidOid, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8)
597 #define OidFunctionCall9(functionId, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9) \
598 OidFunctionCall9Coll(functionId, InvalidOid, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9)
601 /* Special cases for convenient invocation of datatype I/O functions. */
602 extern Datum InputFunctionCall(FmgrInfo *flinfo, char *str,
603 Oid typioparam, int32 typmod);
604 extern Datum OidInputFunctionCall(Oid functionId, char *str,
605 Oid typioparam, int32 typmod);
606 extern char *OutputFunctionCall(FmgrInfo *flinfo, Datum val);
607 extern char *OidOutputFunctionCall(Oid functionId, Datum val);
608 extern Datum ReceiveFunctionCall(FmgrInfo *flinfo, fmStringInfo buf,
609 Oid typioparam, int32 typmod);
610 extern Datum OidReceiveFunctionCall(Oid functionId, fmStringInfo buf,
611 Oid typioparam, int32 typmod);
612 extern bytea *SendFunctionCall(FmgrInfo *flinfo, Datum val);
613 extern bytea *OidSendFunctionCall(Oid functionId, Datum val);
619 extern const Pg_finfo_record *fetch_finfo_record(void *filehandle, char *funcname);
620 extern void clear_external_function_hash(void *filehandle);
621 extern Oid fmgr_internal_function(const char *proname);
622 extern Oid get_fn_expr_rettype(FmgrInfo *flinfo);
623 extern Oid get_fn_expr_argtype(FmgrInfo *flinfo, int argnum);
624 extern Oid get_call_expr_argtype(fmNodePtr expr, int argnum);
625 extern bool get_fn_expr_arg_stable(FmgrInfo *flinfo, int argnum);
626 extern bool get_call_expr_arg_stable(fmNodePtr expr, int argnum);
627 extern bool get_fn_expr_variadic(FmgrInfo *flinfo);
630 * Routines in dfmgr.c
632 extern char *Dynamic_library_path;
634 extern PGFunction load_external_function(char *filename, char *funcname,
635 bool signalNotFound, void **filehandle);
636 extern PGFunction lookup_external_function(void *filehandle, char *funcname);
637 extern void load_file(const char *filename, bool restricted);
638 extern void **find_rendezvous_variable(const char *varName);
641 * Support for aggregate functions
643 * This is actually in executor/nodeAgg.c, but we declare it here since the
644 * whole point is for callers of it to not be overly friendly with nodeAgg.
647 /* AggCheckCallContext can return one of the following codes, or 0: */
648 #define AGG_CONTEXT_AGGREGATE 1 /* regular aggregate */
649 #define AGG_CONTEXT_WINDOW 2 /* window function */
651 extern int AggCheckCallContext(FunctionCallInfo fcinfo,
652 MemoryContext *aggcontext);
655 * We allow plugin modules to hook function entry/exit. This is intended
656 * as support for loadable security policy modules, which may want to
657 * perform additional privilege checks on function entry or exit, or to do
658 * other internal bookkeeping. To make this possible, such modules must be
659 * able not only to support normal function entry and exit, but also to trap
660 * the case where we bail out due to an error; and they must also be able to
663 typedef enum FmgrHookEventType
670 typedef bool (*needs_fmgr_hook_type) (Oid fn_oid);
672 typedef void (*fmgr_hook_type) (FmgrHookEventType event,
673 FmgrInfo *flinfo, Datum *arg);
675 extern PGDLLIMPORT needs_fmgr_hook_type needs_fmgr_hook;
676 extern PGDLLIMPORT fmgr_hook_type fmgr_hook;
678 #define FmgrHookIsNeeded(fn_oid) \
679 (!needs_fmgr_hook ? false : (*needs_fmgr_hook)(fn_oid))
682 * !!! OLD INTERFACE !!!
684 * fmgr() is the only remaining vestige of the old-style caller support
685 * functions. It's no longer used anywhere in the Postgres distribution,
686 * but we should leave it around for a release or two to ease the transition
687 * for user-supplied C functions. OidFunctionCallN() replaces it for new
692 * DEPRECATED, DO NOT USE IN NEW CODE
694 extern char *fmgr(Oid procedureId,...);