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* PL/R - PostgreSQL support for R as a
* procedural language (PL)
* Copyright (c) 2003 by Joseph E. Conway
* Joe Conway <>
* Based on pltcl by Jan Wieck
* and inspired by REmbeddedPostgres by
* Duncan Temple Lang <>
* License: GPL version 2 or newer.
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
* plr.h
#ifndef PLR_H
#define PLR_H
#include <unistd.h>
#include <fcntl.h>
#include <setjmp.h>
#include <sys/stat.h>
#define ELOG_H
#include "postgres.h"
#include "access/heapam.h"
#include "catalog/pg_language.h"
#include "catalog/pg_proc.h"
#include "catalog/pg_type.h"
#include "commands/trigger.h"
#include "executor/spi.h"
#include "nodes/makefuncs.h"
#include "parser/parse_type.h"
#include "tcop/tcopprot.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
#include "utils/syscache.h"
#include "fmgr.h"
#include "R.h"
#include "Rinternals.h"
#include "Rdefines.h"
#ifdef ERROR
#undef ERROR
#ifdef WARNING
#undef WARNING
#undef ELOG_H
#include "utils/elog.h"
#undef PROTECT
#define PROTECT(s) \
do { \
elog(NOTICE, "\tPROTECT\t1\t%s\t%d", __FILE__, __LINE__); \
protect(s); \
} while (0)
#define UNPROTECT(n) \
do { \
elog(NOTICE, "\tUNPROTECT\t%d\t%s\t%d", n, __FILE__, __LINE__); \
unprotect(n); \
} while (0)
#endif /* DEBUGPROTECT */
#define xpfree(var_) \
do { \
if (var_ != NULL) \
{ \
pfree(var_); \
var_ = NULL; \
} \
} while (0)
#define freeStringInfo(mystr_) \
do { \
xpfree((mystr_)->data); \
xpfree(mystr_); \
} while (0)
#define resetStringInfo(mystr_) \
do { \
xpfree((mystr_)->data); \
initStringInfo(mystr_); \
} while (0)
#define NEXT_STR_ELEMENT " %s"
* structs
/* The information we cache about loaded procedures */
typedef struct plr_proc_desc
char *proname;
TransactionId fn_xmin;
CommandId fn_cmin;
bool lanpltrusted;
Oid result_typid;
bool result_istuple;
FmgrInfo result_in_func;
Oid result_elem;
FmgrInfo result_elem_in_func;
int result_elem_typlen;
bool result_elem_typbyval;
char result_elem_typalign;
int nargs;
Oid arg_typid[FUNC_MAX_ARGS];
FmgrInfo arg_out_func[FUNC_MAX_ARGS];
Oid arg_elem[FUNC_MAX_ARGS];
FmgrInfo arg_elem_out_func[FUNC_MAX_ARGS];
int arg_elem_typlen[FUNC_MAX_ARGS];
bool arg_elem_typbyval[FUNC_MAX_ARGS];
char arg_elem_typalign[FUNC_MAX_ARGS];
int arg_is_rel[FUNC_MAX_ARGS];
SEXP fun; /* compiled R function */
} plr_proc_desc;
* external declarations
/* libR interpreter initialization */
extern int Rf_initEmbeddedR(int argc, char **argv);
/* PL/R language handler */
extern Datum plr_call_handler(PG_FUNCTION_ARGS);
extern void start_interp(void);
extern void load_r_cmd(const char *cmd);
extern SEXP call_r_func(SEXP fun, SEXP rargs);
/* argument and return value conversion functions */
extern SEXP pg_scalar_get_r(Datum dvalue, Oid arg_typid, FmgrInfo arg_out_func);
extern SEXP pg_array_get_r(Datum dvalue, FmgrInfo out_func, int typlen, bool typbyval, char typalign);
extern SEXP pg_tuple_get_r_frame(int ntuples, HeapTuple *tuples, TupleDesc tupdesc);
extern Datum r_get_pg(SEXP rval, plr_proc_desc *prodesc, FunctionCallInfo fcinfo);
extern Datum get_scalar_datum(SEXP rval, FmgrInfo result_in_func, Oid result_elem, bool *isnull);
/* Postgres support functions installed into the R interpreter */
extern void throw_pg_notice(const char **msg);
extern void throw_pg_error(const char **msg);
extern SEXP plr_quote_literal(SEXP rawstr);
extern SEXP plr_quote_ident(SEXP rawstr);
extern SEXP plr_SPI_exec(SEXP rsql);
extern SEXP plr_SPI_prepare(SEXP rsql, SEXP rargtypes);
extern SEXP plr_SPI_execp(SEXP rsaved_plan, SEXP rargvalues);
extern SEXP plr_SPI_lastoid(void);
/* Postgres callable functions useful in conjunction with PL/R */
extern Datum install_rcmd(PG_FUNCTION_ARGS);
extern Datum array_push(PG_FUNCTION_ARGS);
extern Datum array(PG_FUNCTION_ARGS);
extern Datum array_accum(PG_FUNCTION_ARGS);
/* Postgres backend support functions */
extern char *get_load_self_ref_cmd(Oid funcid);
extern void perm_fmgr_info(Oid functionId, FmgrInfo *finfo);
extern void system_cache_lookup(Oid element_type, bool input, int *typlen,
bool *typbyval, char *typdelim, Oid *typelem,
Oid *proc, char *typalign);
extern Oid get_typelem(Oid element_type);
* See the no-exported header file ${R_HOME}/src/include/Defn.h
extern void R_PreserveObject(SEXP);
extern void R_ReleaseObject(SEXP);
* See the no-exported header file ${R_HOME}/src/include/Parse.h
extern SEXP R_ParseVector(SEXP, int, int *);
#define PARSE_NULL 0
#define PARSE_OK 1
#define PARSE_ERROR 3
#define PARSE_EOF 4
/* convert C string to text pointer */
#define PG_TEXT_GET_STR(textp_) \
DatumGetCString(DirectFunctionCall1(textout, PointerGetDatum(textp_)))
#define PG_STR_GET_TEXT(str_) \
DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(str_)))
#define PG_REPLACE_STR(str_, substr_, replacestr_) \
PG_TEXT_GET_STR(DirectFunctionCall3(replace_text, \
PG_STR_GET_TEXT(str_), \
PG_STR_GET_TEXT(substr_), \
#endif /* PLR_H */
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