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fmgr.h
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/*------------------------------------------------------------------------- * * fmgr.h * Definitions for the Postgres function manager and function-call * interface. * * This file must be included by all Postgres modules that either define * or call fmgr-callable functions. * * * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/fmgr.h * *------------------------------------------------------------------------- */ #ifndef FMGR_H #define FMGR_H /* We don't want to include primnodes.h here, so make some stub references */ typedef struct Node *fmNodePtr; typedef struct Aggref *fmAggrefPtr; /* Likewise, avoid including execnodes.h here */ typedef void (*fmExprContextCallbackFunction) (Datum arg); /* Likewise, avoid including stringinfo.h here */ typedef struct StringInfoData *fmStringInfo; /* * All functions that can be called directly by fmgr must have this signature. * (Other functions can be called by using a handler that does have this * signature.) */ typedef struct FunctionCallInfoData *FunctionCallInfo; typedef Datum (*PGFunction) (FunctionCallInfo fcinfo); /* * This struct holds the system-catalog information that must be looked up * before a function can be called through fmgr. If the same function is * to be called multiple times, the lookup need be done only once and the * info struct saved for re-use. * * Note that fn_expr really is parse-time-determined information about the * arguments, rather than about the function itself. But it's convenient * to store it here rather than in FunctionCallInfoData, where it might more * logically belong. */ typedef struct FmgrInfo { PGFunction fn_addr; /* pointer to function or handler to be called */ Oid fn_oid; /* OID of function (NOT of handler, if any) */ short fn_nargs; /* number of input args (0..FUNC_MAX_ARGS) */ bool fn_strict; /* function is "strict" (NULL in => NULL out) */ bool fn_retset; /* function returns a set */ unsigned char fn_stats; /* collect stats if track_functions > this */ void *fn_extra; /* extra space for use by handler */ MemoryContext fn_mcxt; /* memory context to store fn_extra in */ fmNodePtr fn_expr; /* expression parse tree for call, or NULL */ } FmgrInfo; /* * This struct is the data actually passed to an fmgr-called function. */ typedef struct FunctionCallInfoData { FmgrInfo *flinfo; /* ptr to lookup info used for this call */ fmNodePtr context; /* pass info about context of call */ fmNodePtr resultinfo; /* pass or return extra info about result */ Oid fncollation; /* collation for function to use */ bool isnull; /* function must set true if result is NULL */ short nargs; /* # arguments actually passed */ Datum arg[FUNC_MAX_ARGS]; /* Arguments passed to function */ bool argnull[FUNC_MAX_ARGS]; /* T if arg[i] is actually NULL */ } FunctionCallInfoData; /* * This routine fills a FmgrInfo struct, given the OID * of the function to be called. */ extern void fmgr_info(Oid functionId, FmgrInfo *finfo); /* * Same, when the FmgrInfo struct is in a memory context longer-lived than * CurrentMemoryContext. The specified context will be set as fn_mcxt * and used to hold all subsidiary data of finfo. */ extern void fmgr_info_cxt(Oid functionId, FmgrInfo *finfo, MemoryContext mcxt); /* Convenience macro for setting the fn_expr field */ #define fmgr_info_set_expr(expr, finfo) \ ((finfo)->fn_expr = (expr)) /* * Copy an FmgrInfo struct */ extern void fmgr_info_copy(FmgrInfo *dstinfo, FmgrInfo *srcinfo, MemoryContext destcxt); /* * This macro initializes all the fields of a FunctionCallInfoData except * for the arg[] and argnull[] arrays. Performance testing has shown that * the fastest way to set up argnull[] for small numbers of arguments is to * explicitly set each required element to false, so we don't try to zero * out the argnull[] array in the macro. */ #define InitFunctionCallInfoData(Fcinfo, Flinfo, Nargs, Collation, Context, Resultinfo) \ do { \ (Fcinfo).flinfo = (Flinfo); \ (Fcinfo).context = (Context); \ (Fcinfo).resultinfo = (Resultinfo); \ (Fcinfo).fncollation = (Collation); \ (Fcinfo).isnull = false; \ (Fcinfo).nargs = (Nargs); \ } while (0) /* * This macro invokes a function given a filled-in FunctionCallInfoData * struct. The macro result is the returned Datum --- but note that * caller must still check fcinfo->isnull! Also, if function is strict, * it is caller's responsibility to verify that no null arguments are present * before calling. * * Some code performs multiple calls without redoing InitFunctionCallInfoData, * possibly altering the argument values. This is okay, but be sure to reset * the fcinfo->isnull flag before each call, since callees are permitted to * assume that starts out false. */ #define FunctionCallInvoke(fcinfo) ((* (fcinfo)->flinfo->fn_addr) (fcinfo)) /*------------------------------------------------------------------------- * Support macros to ease writing fmgr-compatible functions * * A C-coded fmgr-compatible function should be declared as * * Datum * function_name(PG_FUNCTION_ARGS) * { * ... * } * * It should access its arguments using appropriate PG_GETARG_xxx macros * and should return its result using PG_RETURN_xxx. * *------------------------------------------------------------------------- */ /* Standard parameter list for fmgr-compatible functions */ #define PG_FUNCTION_ARGS FunctionCallInfo fcinfo /* * Get collation function should use. */ #define PG_GET_COLLATION() (fcinfo->fncollation) /* * Get number of arguments passed to function. */ #define PG_NARGS() (fcinfo->nargs) /* * If function is not marked "proisstrict" in pg_proc, it must check for * null arguments using this macro. Do not try to GETARG a null argument! */ #define PG_ARGISNULL(n) (fcinfo->argnull[n]) /* * Support for fetching detoasted copies of toastable datatypes (all of * which are varlena types). pg_detoast_datum() gives you either the input * datum (if not toasted) or a detoasted copy allocated with palloc(). * pg_detoast_datum_copy() always gives you a palloc'd copy --- use it * if you need a modifiable copy of the input. Caller is expected to have * checked for null inputs first, if necessary. * * pg_detoast_datum_packed() will return packed (1-byte header) datums * unmodified. It will still expand an externally toasted or compressed datum. * The resulting datum can be accessed using VARSIZE_ANY() and VARDATA_ANY() * (beware of multiple evaluations in those macros!) * * WARNING: It is only safe to use pg_detoast_datum_packed() and * VARDATA_ANY() if you really don't care about the alignment. Either because * you're working with something like text where the alignment doesn't matter * or because you're not going to access its constituent parts and just use * things like memcpy on it anyways. * * Note: it'd be nice if these could be macros, but I see no way to do that * without evaluating the arguments multiple times, which is NOT acceptable. */ extern struct varlena *pg_detoast_datum(struct varlena * datum); extern struct varlena *pg_detoast_datum_copy(struct varlena * datum); extern struct varlena *pg_detoast_datum_slice(struct varlena * datum, int32 first, int32 count); extern struct varlena *pg_detoast_datum_packed(struct varlena * datum); #define PG_DETOAST_DATUM(datum) \ pg_detoast_datum((struct varlena *) DatumGetPointer(datum)) #define PG_DETOAST_DATUM_COPY(datum) \ pg_detoast_datum_copy((struct varlena *) DatumGetPointer(datum)) #define PG_DETOAST_DATUM_SLICE(datum,f,c) \ pg_detoast_datum_slice((struct varlena *) DatumGetPointer(datum), \ (int32) (f), (int32) (c)) /* WARNING -- unaligned pointer */ #define PG_DETOAST_DATUM_PACKED(datum) \ pg_detoast_datum_packed((struct varlena *) DatumGetPointer(datum)) /* * Support for cleaning up detoasted copies of inputs. This must only * be used for pass-by-ref datatypes, and normally would only be used * for toastable types. If the given pointer is different from the * original argument, assume it's a palloc'd detoasted copy, and pfree it. * NOTE: most functions on toastable types do not have to worry about this, * but we currently require that support functions for indexes not leak * memory. */ #define PG_FREE_IF_COPY(ptr,n) \ do { \ if ((Pointer) (ptr) != PG_GETARG_POINTER(n)) \ pfree(ptr); \ } while (0) /* Macros for fetching arguments of standard types */ #define PG_GETARG_DATUM(n) (fcinfo->arg[n]) #define PG_GETARG_INT32(n) DatumGetInt32(PG_GETARG_DATUM(n)) #define PG_GETARG_UINT32(n) DatumGetUInt32(PG_GETARG_DATUM(n)) #define PG_GETARG_INT16(n) DatumGetInt16(PG_GETARG_DATUM(n)) #define PG_GETARG_UINT16(n) DatumGetUInt16(PG_GETARG_DATUM(n)) #define PG_GETARG_CHAR(n) DatumGetChar(PG_GETARG_DATUM(n)) #define PG_GETARG_BOOL(n) DatumGetBool(PG_GETARG_DATUM(n)) #define PG_GETARG_OID(n) DatumGetObjectId(PG_GETARG_DATUM(n)) #define PG_GETARG_POINTER(n) DatumGetPointer(PG_GETARG_DATUM(n)) #define PG_GETARG_CSTRING(n) DatumGetCString(PG_GETARG_DATUM(n)) #define PG_GETARG_NAME(n) DatumGetName(PG_GETARG_DATUM(n)) /* these macros hide the pass-by-reference-ness of the datatype: */ #define PG_GETARG_FLOAT4(n) DatumGetFloat4(PG_GETARG_DATUM(n)) #define PG_GETARG_FLOAT8(n) DatumGetFloat8(PG_GETARG_DATUM(n)) #define PG_GETARG_INT64(n) DatumGetInt64(PG_GETARG_DATUM(n)) /* use this if you want the raw, possibly-toasted input datum: */ #define PG_GETARG_RAW_VARLENA_P(n) ((struct varlena *) PG_GETARG_POINTER(n)) /* use this if you want the input datum de-toasted: */ #define PG_GETARG_VARLENA_P(n) PG_DETOAST_DATUM(PG_GETARG_DATUM(n)) /* and this if you can handle 1-byte-header datums: */ #define PG_GETARG_VARLENA_PP(n) PG_DETOAST_DATUM_PACKED(PG_GETARG_DATUM(n)) /* DatumGetFoo macros for varlena types will typically look like this: */ #define DatumGetByteaP(X) ((bytea *) PG_DETOAST_DATUM(X)) #define DatumGetByteaPP(X) ((bytea *) PG_DETOAST_DATUM_PACKED(X)) #define DatumGetTextP(X) ((text *) PG_DETOAST_DATUM(X)) #define DatumGetTextPP(X) ((text *) PG_DETOAST_DATUM_PACKED(X)) #define DatumGetBpCharP(X) ((BpChar *) PG_DETOAST_DATUM(X)) #define DatumGetBpCharPP(X) ((BpChar *) PG_DETOAST_DATUM_PACKED(X)) #define DatumGetVarCharP(X) ((VarChar *) PG_DETOAST_DATUM(X)) #define DatumGetVarCharPP(X) ((VarChar *) PG_DETOAST_DATUM_PACKED(X)) #define DatumGetHeapTupleHeader(X) ((HeapTupleHeader) PG_DETOAST_DATUM(X)) /* And we also offer variants that return an OK-to-write copy */ #define DatumGetByteaPCopy(X) ((bytea *) PG_DETOAST_DATUM_COPY(X)) #define DatumGetTextPCopy(X) ((text *) PG_DETOAST_DATUM_COPY(X)) #define DatumGetBpCharPCopy(X) ((BpChar *) PG_DETOAST_DATUM_COPY(X)) #define DatumGetVarCharPCopy(X) ((VarChar *) PG_DETOAST_DATUM_COPY(X)) #define DatumGetHeapTupleHeaderCopy(X) ((HeapTupleHeader) PG_DETOAST_DATUM_COPY(X)) /* Variants which return n bytes starting at pos. m */ #define DatumGetByteaPSlice(X,m,n) ((bytea *) PG_DETOAST_DATUM_SLICE(X,m,n)) #define DatumGetTextPSlice(X,m,n) ((text *) PG_DETOAST_DATUM_SLICE(X,m,n)) #define DatumGetBpCharPSlice(X,m,n) ((BpChar *) PG_DETOAST_DATUM_SLICE(X,m,n)) #define DatumGetVarCharPSlice(X,m,n) ((VarChar *) PG_DETOAST_DATUM_SLICE(X,m,n)) /* GETARG macros for varlena types will typically look like this: */ #define PG_GETARG_BYTEA_P(n) DatumGetByteaP(PG_GETARG_DATUM(n)) #define PG_GETARG_BYTEA_PP(n) DatumGetByteaPP(PG_GETARG_DATUM(n)) #define PG_GETARG_TEXT_P(n) DatumGetTextP(PG_GETARG_DATUM(n)) #define PG_GETARG_TEXT_PP(n) DatumGetTextPP(PG_GETARG_DATUM(n)) #define PG_GETARG_BPCHAR_P(n) DatumGetBpCharP(PG_GETARG_DATUM(n)) #define PG_GETARG_BPCHAR_PP(n) DatumGetBpCharPP(PG_GETARG_DATUM(n)) #define PG_GETARG_VARCHAR_P(n) DatumGetVarCharP(PG_GETARG_DATUM(n)) #define PG_GETARG_VARCHAR_PP(n) DatumGetVarCharPP(PG_GETARG_DATUM(n)) #define PG_GETARG_HEAPTUPLEHEADER(n) DatumGetHeapTupleHeader(PG_GETARG_DATUM(n)) /* And we also offer variants that return an OK-to-write copy */ #define PG_GETARG_BYTEA_P_COPY(n) DatumGetByteaPCopy(PG_GETARG_DATUM(n)) #define PG_GETARG_TEXT_P_COPY(n) DatumGetTextPCopy(PG_GETARG_DATUM(n)) #define PG_GETARG_BPCHAR_P_COPY(n) DatumGetBpCharPCopy(PG_GETARG_DATUM(n)) #define PG_GETARG_VARCHAR_P_COPY(n) DatumGetVarCharPCopy(PG_GETARG_DATUM(n)) #define PG_GETARG_HEAPTUPLEHEADER_COPY(n) DatumGetHeapTupleHeaderCopy(PG_GETARG_DATUM(n)) /* And a b-byte slice from position a -also OK to write */ #define PG_GETARG_BYTEA_P_SLICE(n,a,b) DatumGetByteaPSlice(PG_GETARG_DATUM(n),a,b) #define PG_GETARG_TEXT_P_SLICE(n,a,b) DatumGetTextPSlice(PG_GETARG_DATUM(n),a,b) #define PG_GETARG_BPCHAR_P_SLICE(n,a,b) DatumGetBpCharPSlice(PG_GETARG_DATUM(n),a,b) #define PG_GETARG_VARCHAR_P_SLICE(n,a,b) DatumGetVarCharPSlice(PG_GETARG_DATUM(n),a,b) /* To return a NULL do this: */ #define PG_RETURN_NULL() \ do { fcinfo->isnull = true; return (Datum) 0; } while (0) /* A few internal functions return void (which is not the same as NULL!) */ #define PG_RETURN_VOID() return (Datum) 0 /* Macros for returning results of standard types */ #define PG_RETURN_DATUM(x) return (x) #define PG_RETURN_INT32(x) return Int32GetDatum(x) #define PG_RETURN_UINT32(x) return UInt32GetDatum(x) #define PG_RETURN_INT16(x) return Int16GetDatum(x) #define PG_RETURN_UINT16(x) return UInt16GetDatum(x) #define PG_RETURN_CHAR(x) return CharGetDatum(x) #define PG_RETURN_BOOL(x) return BoolGetDatum(x) #define PG_RETURN_OID(x) return ObjectIdGetDatum(x) #define PG_RETURN_POINTER(x) return PointerGetDatum(x) #define PG_RETURN_CSTRING(x) return CStringGetDatum(x) #define PG_RETURN_NAME(x) return NameGetDatum(x) /* these macros hide the pass-by-reference-ness of the datatype: */ #define PG_RETURN_FLOAT4(x) return Float4GetDatum(x) #define PG_RETURN_FLOAT8(x) return Float8GetDatum(x) #define PG_RETURN_INT64(x) return Int64GetDatum(x) /* RETURN macros for other pass-by-ref types will typically look like this: */ #define PG_RETURN_BYTEA_P(x) PG_RETURN_POINTER(x) #define PG_RETURN_TEXT_P(x) PG_RETURN_POINTER(x) #define PG_RETURN_BPCHAR_P(x) PG_RETURN_POINTER(x) #define PG_RETURN_VARCHAR_P(x) PG_RETURN_POINTER(x) #define PG_RETURN_HEAPTUPLEHEADER(x) return HeapTupleHeaderGetDatum(x) /*------------------------------------------------------------------------- * Support for detecting call convention of dynamically-loaded functions * * Dynamically loaded functions may use either the version-1 ("new style") * or version-0 ("old style") calling convention. Version 1 is the call * convention defined in this header file; version 0 is the old "plain C" * convention. A version-1 function must be accompanied by the macro call * * PG_FUNCTION_INFO_V1(function_name); * * Note that internal functions do not need this decoration since they are * assumed to be version-1. * *------------------------------------------------------------------------- */ typedef struct { int api_version; /* specifies call convention version number */ /* More fields may be added later, for version numbers > 1. */ } Pg_finfo_record; /* Expected signature of an info function */ typedef const Pg_finfo_record *(*PGFInfoFunction) (void); /* * Macro to build an info function associated with the given function name. * * As a convenience, also provide an "extern" declaration for the given * function name, so that writers of C functions need not write that too. * * On Windows, the function and info function must be exported. Our normal * build processes take care of that via .DEF files or --export-all-symbols. * Module authors using a different build process might need to manually * declare the function PGDLLEXPORT. We do that automatically here for the * info function, since authors shouldn't need to be explicitly aware of it. */ #define PG_FUNCTION_INFO_V1(funcname) \ extern Datum funcname(PG_FUNCTION_ARGS); \ extern PGDLLEXPORT const Pg_finfo_record * CppConcat(pg_finfo_,funcname)(void); \ const Pg_finfo_record * \ CppConcat(pg_finfo_,funcname) (void) \ { \ static const Pg_finfo_record my_finfo = { 1 }; \ return &my_finfo; \ } \ extern int no_such_variable /*------------------------------------------------------------------------- * Support for verifying backend compatibility of loaded modules * * We require dynamically-loaded modules to include the macro call * PG_MODULE_MAGIC; * so that we can check for obvious incompatibility, such as being compiled * for a different major PostgreSQL version. * * To compile with versions of PostgreSQL that do not support this, * you may put an #ifdef/#endif test around it. Note that in a multiple- * source-file module, the macro call should only appear once. * * The specific items included in the magic block are intended to be ones that * are custom-configurable and especially likely to break dynamically loaded * modules if they were compiled with other values. Also, the length field * can be used to detect definition changes. * * Note: we compare magic blocks with memcmp(), so there had better not be * any alignment pad bytes in them. * * Note: when changing the contents of magic blocks, be sure to adjust the * incompatible_module_error() function in dfmgr.c. *------------------------------------------------------------------------- */ /* Definition of the magic block structure */ typedef struct { int len; /* sizeof(this struct) */ int version; /* PostgreSQL major version */ int funcmaxargs; /* FUNC_MAX_ARGS */ int indexmaxkeys; /* INDEX_MAX_KEYS */ int namedatalen; /* NAMEDATALEN */ int float4byval; /* FLOAT4PASSBYVAL */ int float8byval; /* FLOAT8PASSBYVAL */ } Pg_magic_struct; /* The actual data block contents */ #define PG_MODULE_MAGIC_DATA \ { \ sizeof(Pg_magic_struct), \ PG_VERSION_NUM / 100, \ FUNC_MAX_ARGS, \ INDEX_MAX_KEYS, \ NAMEDATALEN, \ FLOAT4PASSBYVAL, \ FLOAT8PASSBYVAL \ } /* * Declare the module magic function. It needs to be a function as the dlsym * in the backend is only guaranteed to work on functions, not data */ typedef const Pg_magic_struct *(*PGModuleMagicFunction) (void); #define PG_MAGIC_FUNCTION_NAME Pg_magic_func #define PG_MAGIC_FUNCTION_NAME_STRING "Pg_magic_func" #define PG_MODULE_MAGIC \ extern PGDLLEXPORT const Pg_magic_struct *PG_MAGIC_FUNCTION_NAME(void); \ const Pg_magic_struct * \ PG_MAGIC_FUNCTION_NAME(void) \ { \ static const Pg_magic_struct Pg_magic_data = PG_MODULE_MAGIC_DATA; \ return &Pg_magic_data; \ } \ extern int no_such_variable /*------------------------------------------------------------------------- * Support routines and macros for callers of fmgr-compatible functions *------------------------------------------------------------------------- */ /* These are for invocation of a specifically named function with a * directly-computed parameter list. Note that neither arguments nor result * are allowed to be NULL. */ extern Datum DirectFunctionCall1Coll(PGFunction func, Oid collation, Datum arg1); extern Datum DirectFunctionCall2Coll(PGFunction func, Oid collation, Datum arg1, Datum arg2); extern Datum DirectFunctionCall3Coll(PGFunction func, Oid collation, Datum arg1, Datum arg2, Datum arg3); extern Datum DirectFunctionCall4Coll(PGFunction func, Oid collation, Datum arg1, Datum arg2, Datum arg3, Datum arg4); extern Datum DirectFunctionCall5Coll(PGFunction func, Oid collation, Datum arg1, Datum arg2, Datum arg3, Datum arg4, Datum arg5); extern Datum DirectFunctionCall6Coll(PGFunction func, Oid collation, Datum arg1, Datum arg2, Datum arg3, Datum arg4, Datum arg5, Datum arg6); extern Datum DirectFunctionCall7Coll(PGFunction func, Oid collation, Datum arg1, Datum arg2, Datum arg3, Datum arg4, Datum arg5, Datum arg6, Datum arg7); extern Datum DirectFunctionCall8Coll(PGFunction func, Oid collation, Datum arg1, Datum arg2, Datum arg3, Datum arg4, Datum arg5, Datum arg6, Datum arg7, Datum arg8); extern Datum DirectFunctionCall9Coll(PGFunction func, Oid collation, Datum arg1, Datum arg2, Datum arg3, Datum arg4, Datum arg5, Datum arg6, Datum arg7, Datum arg8, Datum arg9); /* These are for invocation of a previously-looked-up function with a * directly-computed parameter list. Note that neither arguments nor result * are allowed to be NULL. */ extern Datum FunctionCall1Coll(FmgrInfo *flinfo, Oid collation, Datum arg1); extern Datum FunctionCall2Coll(FmgrInfo *flinfo, Oid collation, Datum arg1, Datum arg2); extern Datum FunctionCall3Coll(FmgrInfo *flinfo, Oid collation, Datum arg1, Datum arg2, Datum arg3); extern Datum FunctionCall4Coll(FmgrInfo *flinfo, Oid collation, Datum arg1, Datum arg2, Datum arg3, Datum arg4); extern Datum FunctionCall5Coll(FmgrInfo *flinfo, Oid collation, Datum arg1, Datum arg2, Datum arg3, Datum arg4, Datum arg5); extern Datum FunctionCall6Coll(FmgrInfo *flinfo, Oid collation, Datum arg1, Datum arg2, Datum arg3, Datum arg4, Datum arg5, Datum arg6); extern Datum FunctionCall7Coll(FmgrInfo *flinfo, Oid collation, Datum arg1, Datum arg2, Datum arg3, Datum arg4, Datum arg5, Datum arg6, Datum arg7); extern Datum FunctionCall8Coll(FmgrInfo *flinfo, Oid collation, Datum arg1, Datum arg2, Datum arg3, Datum arg4, Datum arg5, Datum arg6, Datum arg7, Datum arg8); extern Datum FunctionCall9Coll(FmgrInfo *flinfo, Oid collation, Datum arg1, Datum arg2, Datum arg3, Datum arg4, Datum arg5, Datum arg6, Datum arg7, Datum arg8, Datum arg9); /* These are for invocation of a function identified by OID with a * directly-computed parameter list. Note that neither arguments nor result * are allowed to be NULL. These are essentially fmgr_info() followed by * FunctionCallN(). If the same function is to be invoked repeatedly, do the * fmgr_info() once and then use FunctionCallN(). */ extern Datum OidFunctionCall0Coll(Oid functionId, Oid collation); extern Datum OidFunctionCall1Coll(Oid functionId, Oid collation, Datum arg1); extern Datum OidFunctionCall2Coll(Oid functionId, Oid collation, Datum arg1, Datum arg2); extern Datum OidFunctionCall3Coll(Oid functionId, Oid collation, Datum arg1, Datum arg2, Datum arg3); extern Datum OidFunctionCall4Coll(Oid functionId, Oid collation, Datum arg1, Datum arg2, Datum arg3, Datum arg4); extern Datum OidFunctionCall5Coll(Oid functionId, Oid collation, Datum arg1, Datum arg2, Datum arg3, Datum arg4, Datum arg5); extern Datum OidFunctionCall6Coll(Oid functionId, Oid collation, Datum arg1, Datum arg2, Datum arg3, Datum arg4, Datum arg5, Datum arg6); extern Datum OidFunctionCall7Coll(Oid functionId, Oid collation, Datum arg1, Datum arg2, Datum arg3, Datum arg4, Datum arg5, Datum arg6, Datum arg7); extern Datum OidFunctionCall8Coll(Oid functionId, Oid collation, Datum arg1, Datum arg2, Datum arg3, Datum arg4, Datum arg5, Datum arg6, Datum arg7, Datum arg8); extern Datum OidFunctionCall9Coll(Oid functionId, Oid collation, Datum arg1, Datum arg2, Datum arg3, Datum arg4, Datum arg5, Datum arg6, Datum arg7, Datum arg8, Datum arg9); /* These macros allow the collation argument to be omitted (with a default of * InvalidOid, ie, no collation). They exist mostly for backwards * compatibility of source code. */ #define DirectFunctionCall1(func, arg1) \ DirectFunctionCall1Coll(func, InvalidOid, arg1) #define DirectFunctionCall2(func, arg1, arg2) \ DirectFunctionCall2Coll(func, InvalidOid, arg1, arg2) #define DirectFunctionCall3(func, arg1, arg2, arg3) \ DirectFunctionCall3Coll(func, InvalidOid, arg1, arg2, arg3) #define DirectFunctionCall4(func, arg1, arg2, arg3, arg4) \ DirectFunctionCall4Coll(func, InvalidOid, arg1, arg2, arg3, arg4) #define DirectFunctionCall5(func, arg1, arg2, arg3, arg4, arg5) \ DirectFunctionCall5Coll(func, InvalidOid, arg1, arg2, arg3, arg4, arg5) #define DirectFunctionCall6(func, arg1, arg2, arg3, arg4, arg5, arg6) \ DirectFunctionCall6Coll(func, InvalidOid, arg1, arg2, arg3, arg4, arg5, arg6) #define DirectFunctionCall7(func, arg1, arg2, arg3, arg4, arg5, arg6, arg7) \ DirectFunctionCall7Coll(func, InvalidOid, arg1, arg2, arg3, arg4, arg5, arg6, arg7) #define DirectFunctionCall8(func, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8) \ DirectFunctionCall8Coll(func, InvalidOid, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8) #define DirectFunctionCall9(func, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9) \ DirectFunctionCall9Coll(func, InvalidOid, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9) #define FunctionCall1(flinfo, arg1) \ FunctionCall1Coll(flinfo, InvalidOid, arg1) #define FunctionCall2(flinfo, arg1, arg2) \ FunctionCall2Coll(flinfo, InvalidOid, arg1, arg2) #define FunctionCall3(flinfo, arg1, arg2, arg3) \ FunctionCall3Coll(flinfo, InvalidOid, arg1, arg2, arg3) #define FunctionCall4(flinfo, arg1, arg2, arg3, arg4) \ FunctionCall4Coll(flinfo, InvalidOid, arg1, arg2, arg3, arg4) #define FunctionCall5(flinfo, arg1, arg2, arg3, arg4, arg5) \ FunctionCall5Coll(flinfo, InvalidOid, arg1, arg2, arg3, arg4, arg5) #define FunctionCall6(flinfo, arg1, arg2, arg3, arg4, arg5, arg6) \ FunctionCall6Coll(flinfo, InvalidOid, arg1, arg2, arg3, arg4, arg5, arg6) #define FunctionCall7(flinfo, arg1, arg2, arg3, arg4, arg5, arg6, arg7) \ FunctionCall7Coll(flinfo, InvalidOid, arg1, arg2, arg3, arg4, arg5, arg6, arg7) #define FunctionCall8(flinfo, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8) \ FunctionCall8Coll(flinfo, InvalidOid, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8) #define FunctionCall9(flinfo, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9) \ FunctionCall9Coll(flinfo, InvalidOid, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9) #define OidFunctionCall0(functionId) \ OidFunctionCall0Coll(functionId, InvalidOid) #define OidFunctionCall1(functionId, arg1) \ OidFunctionCall1Coll(functionId, InvalidOid, arg1) #define OidFunctionCall2(functionId, arg1, arg2) \ OidFunctionCall2Coll(functionId, InvalidOid, arg1, arg2) #define OidFunctionCall3(functionId, arg1, arg2, arg3) \ OidFunctionCall3Coll(functionId, InvalidOid, arg1, arg2, arg3) #define OidFunctionCall4(functionId, arg1, arg2, arg3, arg4) \ OidFunctionCall4Coll(functionId, InvalidOid, arg1, arg2, arg3, arg4) #define OidFunctionCall5(functionId, arg1, arg2, arg3, arg4, arg5) \ OidFunctionCall5Coll(functionId, InvalidOid, arg1, arg2, arg3, arg4, arg5) #define OidFunctionCall6(functionId, arg1, arg2, arg3, arg4, arg5, arg6) \ OidFunctionCall6Coll(functionId, InvalidOid, arg1, arg2, arg3, arg4, arg5, arg6) #define OidFunctionCall7(functionId, arg1, arg2, arg3, arg4, arg5, arg6, arg7) \ OidFunctionCall7Coll(functionId, InvalidOid, arg1, arg2, arg3, arg4, arg5, arg6, arg7) #define OidFunctionCall8(functionId, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8) \ OidFunctionCall8Coll(functionId, InvalidOid, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8) #define OidFunctionCall9(functionId, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9) \ OidFunctionCall9Coll(functionId, InvalidOid, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9) /* Special cases for convenient invocation of datatype I/O functions. */ extern Datum InputFunctionCall(FmgrInfo *flinfo, char *str, Oid typioparam, int32 typmod); extern Datum OidInputFunctionCall(Oid functionId, char *str, Oid typioparam, int32 typmod); extern char *OutputFunctionCall(FmgrInfo *flinfo, Datum val); extern char *OidOutputFunctionCall(Oid functionId, Datum val); extern Datum ReceiveFunctionCall(FmgrInfo *flinfo, fmStringInfo buf, Oid typioparam, int32 typmod); extern Datum OidReceiveFunctionCall(Oid functionId, fmStringInfo buf, Oid typioparam, int32 typmod); extern bytea *SendFunctionCall(FmgrInfo *flinfo, Datum val); extern bytea *OidSendFunctionCall(Oid functionId, Datum val); /* * Routines in fmgr.c */ extern const Pg_finfo_record *fetch_finfo_record(void *filehandle, char *funcname); extern void clear_external_function_hash(void *filehandle); extern Oid fmgr_internal_function(const char *proname); extern Oid get_fn_expr_rettype(FmgrInfo *flinfo); extern Oid get_fn_expr_argtype(FmgrInfo *flinfo, int argnum); extern Oid get_call_expr_argtype(fmNodePtr expr, int argnum); extern bool get_fn_expr_arg_stable(FmgrInfo *flinfo, int argnum); extern bool get_call_expr_arg_stable(fmNodePtr expr, int argnum); extern bool get_fn_expr_variadic(FmgrInfo *flinfo); extern bool CheckFunctionValidatorAccess(Oid validatorOid, Oid functionOid); /* * Routines in dfmgr.c */ extern char *Dynamic_library_path; extern PGFunction load_external_function(char *filename, char *funcname, bool signalNotFound, void **filehandle); extern PGFunction lookup_external_function(void *filehandle, char *funcname); extern void load_file(const char *filename, bool restricted); extern void **find_rendezvous_variable(const char *varName); extern Size EstimateLibraryStateSpace(void); extern void SerializeLibraryState(Size maxsize, char *start_address); extern void RestoreLibraryState(char *start_address); /* * Support for aggregate functions * * These are actually in executor/nodeAgg.c, but we declare them here since * the whole point is for callers to not be overly friendly with nodeAgg. */ /* AggCheckCallContext can return one of the following codes, or 0: */ #define AGG_CONTEXT_AGGREGATE 1 /* regular aggregate */ #define AGG_CONTEXT_WINDOW 2 /* window function */ extern int AggCheckCallContext(FunctionCallInfo fcinfo, MemoryContext *aggcontext); extern fmAggrefPtr AggGetAggref(FunctionCallInfo fcinfo); extern MemoryContext AggGetTempMemoryContext(FunctionCallInfo fcinfo); extern void AggRegisterCallback(FunctionCallInfo fcinfo, fmExprContextCallbackFunction func, Datum arg); /* * We allow plugin modules to hook function entry/exit. This is intended * as support for loadable security policy modules, which may want to * perform additional privilege checks on function entry or exit, or to do * other internal bookkeeping. To make this possible, such modules must be * able not only to support normal function entry and exit, but also to trap * the case where we bail out due to an error; and they must also be able to * prevent inlining. */ typedef enum FmgrHookEventType { FHET_START, FHET_END, FHET_ABORT } FmgrHookEventType; typedef bool (*needs_fmgr_hook_type) (Oid fn_oid); typedef void (*fmgr_hook_type) (FmgrHookEventType event, FmgrInfo *flinfo, Datum *arg); extern PGDLLIMPORT needs_fmgr_hook_type needs_fmgr_hook; extern PGDLLIMPORT fmgr_hook_type fmgr_hook; #define FmgrHookIsNeeded(fn_oid) \ (!needs_fmgr_hook ? false : (*needs_fmgr_hook)(fn_oid)) /* * !!! OLD INTERFACE !!! * * fmgr() is the only remaining vestige of the old-style caller support * functions. It's no longer used anywhere in the Postgres distribution, * but we should leave it around for a release or two to ease the transition * for user-supplied C functions. OidFunctionCallN() replaces it for new * code. */ /* * DEPRECATED, DO NOT USE IN NEW CODE */ extern char *fmgr(Oid procedureId,...); #endif /* FMGR_H */