TLA Line data Source code
1 : /**********************************************************************
2 : * pltcl.c - PostgreSQL support for Tcl as
3 : * procedural language (PL)
4 : *
5 : * src/pl/tcl/pltcl.c
6 : *
7 : **********************************************************************/
8 :
9 : #include "postgres.h"
10 :
11 : #include <tcl.h>
12 :
13 : #include <unistd.h>
14 : #include <fcntl.h>
15 :
16 : #include "access/htup_details.h"
17 : #include "access/xact.h"
18 : #include "catalog/objectaccess.h"
19 : #include "catalog/pg_proc.h"
20 : #include "catalog/pg_type.h"
21 : #include "commands/event_trigger.h"
22 : #include "commands/trigger.h"
23 : #include "executor/spi.h"
24 : #include "fmgr.h"
25 : #include "funcapi.h"
26 : #include "mb/pg_wchar.h"
27 : #include "miscadmin.h"
28 : #include "nodes/makefuncs.h"
29 : #include "parser/parse_func.h"
30 : #include "parser/parse_type.h"
31 : #include "pgstat.h"
32 : #include "tcop/tcopprot.h"
33 : #include "utils/acl.h"
34 : #include "utils/builtins.h"
35 : #include "utils/lsyscache.h"
36 : #include "utils/memutils.h"
37 : #include "utils/regproc.h"
38 : #include "utils/rel.h"
39 : #include "utils/syscache.h"
40 : #include "utils/typcache.h"
41 :
42 :
43 CBC 9 : PG_MODULE_MAGIC;
44 :
45 : #define HAVE_TCL_VERSION(maj,min) \
46 : ((TCL_MAJOR_VERSION > maj) || \
47 : (TCL_MAJOR_VERSION == maj && TCL_MINOR_VERSION >= min))
48 :
49 : /* Insist on Tcl >= 8.4 */
50 : #if !HAVE_TCL_VERSION(8,4)
51 : #error PostgreSQL only supports Tcl 8.4 or later.
52 : #endif
53 :
54 : /* Hack to deal with Tcl 8.6 const-ification without losing compatibility */
55 : #ifndef CONST86
56 : #define CONST86
57 : #endif
58 :
59 : /* define our text domain for translations */
60 : #undef TEXTDOMAIN
61 : #define TEXTDOMAIN PG_TEXTDOMAIN("pltcl")
62 :
63 :
64 : /*
65 : * Support for converting between UTF8 (which is what all strings going into
66 : * or out of Tcl should be) and the database encoding.
67 : *
68 : * If you just use utf_u2e() or utf_e2u() directly, they will leak some
69 : * palloc'd space when doing a conversion. This is not worth worrying about
70 : * if it only happens, say, once per PL/Tcl function call. If it does seem
71 : * worth worrying about, use the wrapper macros.
72 : */
73 :
74 : static inline char *
75 753 : utf_u2e(const char *src)
76 : {
77 753 : return pg_any_to_server(src, strlen(src), PG_UTF8);
78 : }
79 :
80 : static inline char *
81 1337 : utf_e2u(const char *src)
82 : {
83 1337 : return pg_server_to_any(src, strlen(src), PG_UTF8);
84 : }
85 :
86 : #define UTF_BEGIN \
87 : do { \
88 : const char *_pltcl_utf_src = NULL; \
89 : char *_pltcl_utf_dst = NULL
90 :
91 : #define UTF_END \
92 : if (_pltcl_utf_src != (const char *) _pltcl_utf_dst) \
93 : pfree(_pltcl_utf_dst); \
94 : } while (0)
95 :
96 : #define UTF_U2E(x) \
97 : (_pltcl_utf_dst = utf_u2e(_pltcl_utf_src = (x)))
98 :
99 : #define UTF_E2U(x) \
100 : (_pltcl_utf_dst = utf_e2u(_pltcl_utf_src = (x)))
101 :
102 :
103 : /**********************************************************************
104 : * Information associated with a Tcl interpreter. We have one interpreter
105 : * that is used for all pltclu (untrusted) functions. For pltcl (trusted)
106 : * functions, there is a separate interpreter for each effective SQL userid.
107 : * (This is needed to ensure that an unprivileged user can't inject Tcl code
108 : * that'll be executed with the privileges of some other SQL user.)
109 : *
110 : * The pltcl_interp_desc structs are kept in a Postgres hash table indexed
111 : * by userid OID, with OID 0 used for the single untrusted interpreter.
112 : **********************************************************************/
113 : typedef struct pltcl_interp_desc
114 : {
115 : Oid user_id; /* Hash key (must be first!) */
116 : Tcl_Interp *interp; /* The interpreter */
117 : Tcl_HashTable query_hash; /* pltcl_query_desc structs */
118 : } pltcl_interp_desc;
119 :
120 :
121 : /**********************************************************************
122 : * The information we cache about loaded procedures
123 : *
124 : * The pltcl_proc_desc struct itself, as well as all subsidiary data,
125 : * is stored in the memory context identified by the fn_cxt field.
126 : * We can reclaim all the data by deleting that context, and should do so
127 : * when the fn_refcount goes to zero. (But note that we do not bother
128 : * trying to clean up Tcl's copy of the procedure definition: it's Tcl's
129 : * problem to manage its memory when we replace a proc definition. We do
130 : * not clean up pltcl_proc_descs when a pg_proc row is deleted, only when
131 : * it is updated, and the same policy applies to Tcl's copy as well.)
132 : *
133 : * Note that the data in this struct is shared across all active calls;
134 : * nothing except the fn_refcount should be changed by a call instance.
135 : **********************************************************************/
136 : typedef struct pltcl_proc_desc
137 : {
138 : char *user_proname; /* user's name (from pg_proc.proname) */
139 : char *internal_proname; /* Tcl name (based on function OID) */
140 : MemoryContext fn_cxt; /* memory context for this procedure */
141 : unsigned long fn_refcount; /* number of active references */
142 : TransactionId fn_xmin; /* xmin of pg_proc row */
143 : ItemPointerData fn_tid; /* TID of pg_proc row */
144 : bool fn_readonly; /* is function readonly? */
145 : bool lanpltrusted; /* is it pltcl (vs. pltclu)? */
146 : pltcl_interp_desc *interp_desc; /* interpreter to use */
147 : Oid result_typid; /* OID of fn's result type */
148 : FmgrInfo result_in_func; /* input function for fn's result type */
149 : Oid result_typioparam; /* param to pass to same */
150 : bool fn_retisset; /* true if function returns a set */
151 : bool fn_retistuple; /* true if function returns composite */
152 : bool fn_retisdomain; /* true if function returns domain */
153 : void *domain_info; /* opaque cache for domain checks */
154 : int nargs; /* number of arguments */
155 : /* these arrays have nargs entries: */
156 : FmgrInfo *arg_out_func; /* output fns for arg types */
157 : bool *arg_is_rowtype; /* is each arg composite? */
158 : } pltcl_proc_desc;
159 :
160 :
161 : /**********************************************************************
162 : * The information we cache about prepared and saved plans
163 : **********************************************************************/
164 : typedef struct pltcl_query_desc
165 : {
166 : char qname[20];
167 : SPIPlanPtr plan;
168 : int nargs;
169 : Oid *argtypes;
170 : FmgrInfo *arginfuncs;
171 : Oid *argtypioparams;
172 : } pltcl_query_desc;
173 :
174 :
175 : /**********************************************************************
176 : * For speedy lookup, we maintain a hash table mapping from
177 : * function OID + trigger flag + user OID to pltcl_proc_desc pointers.
178 : * The reason the pltcl_proc_desc struct isn't directly part of the hash
179 : * entry is to simplify recovery from errors during compile_pltcl_function.
180 : *
181 : * Note: if the same function is called by multiple userIDs within a session,
182 : * there will be a separate pltcl_proc_desc entry for each userID in the case
183 : * of pltcl functions, but only one entry for pltclu functions, because we
184 : * set user_id = 0 for that case.
185 : **********************************************************************/
186 : typedef struct pltcl_proc_key
187 : {
188 : Oid proc_id; /* Function OID */
189 :
190 : /*
191 : * is_trigger is really a bool, but declare as Oid to ensure this struct
192 : * contains no padding
193 : */
194 : Oid is_trigger; /* is it a trigger function? */
195 : Oid user_id; /* User calling the function, or 0 */
196 : } pltcl_proc_key;
197 :
198 : typedef struct pltcl_proc_ptr
199 : {
200 : pltcl_proc_key proc_key; /* Hash key (must be first!) */
201 : pltcl_proc_desc *proc_ptr;
202 : } pltcl_proc_ptr;
203 :
204 :
205 : /**********************************************************************
206 : * Per-call state
207 : **********************************************************************/
208 : typedef struct pltcl_call_state
209 : {
210 : /* Call info struct, or NULL in a trigger */
211 : FunctionCallInfo fcinfo;
212 :
213 : /* Trigger data, if we're in a normal (not event) trigger; else NULL */
214 : TriggerData *trigdata;
215 :
216 : /* Function we're executing (NULL if not yet identified) */
217 : pltcl_proc_desc *prodesc;
218 :
219 : /*
220 : * Information for SRFs and functions returning composite types.
221 : * ret_tupdesc and attinmeta are set up if either fn_retistuple or
222 : * fn_retisset, since even a scalar-returning SRF needs a tuplestore.
223 : */
224 : TupleDesc ret_tupdesc; /* return rowtype, if retistuple or retisset */
225 : AttInMetadata *attinmeta; /* metadata for building tuples of that type */
226 :
227 : ReturnSetInfo *rsi; /* passed-in ReturnSetInfo, if any */
228 : Tuplestorestate *tuple_store; /* SRFs accumulate result here */
229 : MemoryContext tuple_store_cxt; /* context and resowner for tuplestore */
230 : ResourceOwner tuple_store_owner;
231 : } pltcl_call_state;
232 :
233 :
234 : /**********************************************************************
235 : * Global data
236 : **********************************************************************/
237 : static char *pltcl_start_proc = NULL;
238 : static char *pltclu_start_proc = NULL;
239 : static bool pltcl_pm_init_done = false;
240 : static Tcl_Interp *pltcl_hold_interp = NULL;
241 : static HTAB *pltcl_interp_htab = NULL;
242 : static HTAB *pltcl_proc_htab = NULL;
243 :
244 : /* this is saved and restored by pltcl_handler */
245 : static pltcl_call_state *pltcl_current_call_state = NULL;
246 :
247 : /**********************************************************************
248 : * Lookup table for SQLSTATE condition names
249 : **********************************************************************/
250 : typedef struct
251 : {
252 : const char *label;
253 : int sqlerrstate;
254 : } TclExceptionNameMap;
255 :
256 : static const TclExceptionNameMap exception_name_map[] = {
257 : #include "pltclerrcodes.h" /* pgrminclude ignore */
258 : {NULL, 0}
259 : };
260 :
261 : /**********************************************************************
262 : * Forward declarations
263 : **********************************************************************/
264 :
265 : static void pltcl_init_interp(pltcl_interp_desc *interp_desc,
266 : Oid prolang, bool pltrusted);
267 : static pltcl_interp_desc *pltcl_fetch_interp(Oid prolang, bool pltrusted);
268 : static void call_pltcl_start_proc(Oid prolang, bool pltrusted);
269 : static void start_proc_error_callback(void *arg);
270 :
271 : static Datum pltcl_handler(PG_FUNCTION_ARGS, bool pltrusted);
272 :
273 : static Datum pltcl_func_handler(PG_FUNCTION_ARGS, pltcl_call_state *call_state,
274 : bool pltrusted);
275 : static HeapTuple pltcl_trigger_handler(PG_FUNCTION_ARGS, pltcl_call_state *call_state,
276 : bool pltrusted);
277 : static void pltcl_event_trigger_handler(PG_FUNCTION_ARGS, pltcl_call_state *call_state,
278 : bool pltrusted);
279 :
280 : static void throw_tcl_error(Tcl_Interp *interp, const char *proname);
281 :
282 : static pltcl_proc_desc *compile_pltcl_function(Oid fn_oid, Oid tgreloid,
283 : bool is_event_trigger,
284 : bool pltrusted);
285 :
286 : static int pltcl_elog(ClientData cdata, Tcl_Interp *interp,
287 : int objc, Tcl_Obj *const objv[]);
288 : static void pltcl_construct_errorCode(Tcl_Interp *interp, ErrorData *edata);
289 : static const char *pltcl_get_condition_name(int sqlstate);
290 : static int pltcl_quote(ClientData cdata, Tcl_Interp *interp,
291 : int objc, Tcl_Obj *const objv[]);
292 : static int pltcl_argisnull(ClientData cdata, Tcl_Interp *interp,
293 : int objc, Tcl_Obj *const objv[]);
294 : static int pltcl_returnnull(ClientData cdata, Tcl_Interp *interp,
295 : int objc, Tcl_Obj *const objv[]);
296 : static int pltcl_returnnext(ClientData cdata, Tcl_Interp *interp,
297 : int objc, Tcl_Obj *const objv[]);
298 : static int pltcl_SPI_execute(ClientData cdata, Tcl_Interp *interp,
299 : int objc, Tcl_Obj *const objv[]);
300 : static int pltcl_process_SPI_result(Tcl_Interp *interp,
301 : const char *arrayname,
302 : Tcl_Obj *loop_body,
303 : int spi_rc,
304 : SPITupleTable *tuptable,
305 : uint64 ntuples);
306 : static int pltcl_SPI_prepare(ClientData cdata, Tcl_Interp *interp,
307 : int objc, Tcl_Obj *const objv[]);
308 : static int pltcl_SPI_execute_plan(ClientData cdata, Tcl_Interp *interp,
309 : int objc, Tcl_Obj *const objv[]);
310 : static int pltcl_subtransaction(ClientData cdata, Tcl_Interp *interp,
311 : int objc, Tcl_Obj *const objv[]);
312 : static int pltcl_commit(ClientData cdata, Tcl_Interp *interp,
313 : int objc, Tcl_Obj *const objv[]);
314 : static int pltcl_rollback(ClientData cdata, Tcl_Interp *interp,
315 : int objc, Tcl_Obj *const objv[]);
316 :
317 : static void pltcl_subtrans_begin(MemoryContext oldcontext,
318 : ResourceOwner oldowner);
319 : static void pltcl_subtrans_commit(MemoryContext oldcontext,
320 : ResourceOwner oldowner);
321 : static void pltcl_subtrans_abort(Tcl_Interp *interp,
322 : MemoryContext oldcontext,
323 : ResourceOwner oldowner);
324 :
325 : static void pltcl_set_tuple_values(Tcl_Interp *interp, const char *arrayname,
326 : uint64 tupno, HeapTuple tuple, TupleDesc tupdesc);
327 : static Tcl_Obj *pltcl_build_tuple_argument(HeapTuple tuple, TupleDesc tupdesc, bool include_generated);
328 : static HeapTuple pltcl_build_tuple_result(Tcl_Interp *interp,
329 : Tcl_Obj **kvObjv, int kvObjc,
330 : pltcl_call_state *call_state);
331 : static void pltcl_init_tuple_store(pltcl_call_state *call_state);
332 :
333 :
334 : /*
335 : * Hack to override Tcl's builtin Notifier subsystem. This prevents the
336 : * backend from becoming multithreaded, which breaks all sorts of things.
337 : * That happens in the default version of Tcl_InitNotifier if the TCL library
338 : * has been compiled with multithreading support (i.e. when TCL_THREADS is
339 : * defined under Unix, and in all cases under Windows).
340 : * It's okay to disable the notifier because we never enter the Tcl event loop
341 : * from Postgres, so the notifier capabilities are initialized, but never
342 : * used. Only InitNotifier and DeleteFileHandler ever seem to get called
343 : * within Postgres, but we implement all the functions for completeness.
344 : */
345 ECB : static ClientData
346 GIC 9 : pltcl_InitNotifier(void)
347 : {
348 : static int fakeThreadKey; /* To give valid address for ClientData */
349 ECB :
350 GIC 9 : return (ClientData) &(fakeThreadKey);
351 : }
352 :
353 EUB : static void
354 UIC 0 : pltcl_FinalizeNotifier(ClientData clientData)
355 EUB : {
356 UIC 0 : }
357 :
358 ECB : static void
359 GIC 1 : pltcl_SetTimer(CONST86 Tcl_Time *timePtr)
360 ECB : {
361 GIC 1 : }
362 :
363 EUB : static void
364 UIC 0 : pltcl_AlertNotifier(ClientData clientData)
365 EUB : {
366 UIC 0 : }
367 :
368 EUB : static void
369 UIC 0 : pltcl_CreateFileHandler(int fd, int mask,
370 : Tcl_FileProc *proc, ClientData clientData)
371 EUB : {
372 UIC 0 : }
373 :
374 ECB : static void
375 GIC 44 : pltcl_DeleteFileHandler(int fd)
376 ECB : {
377 GIC 44 : }
378 :
379 EUB : static void
380 UIC 0 : pltcl_ServiceModeHook(int mode)
381 EUB : {
382 UIC 0 : }
383 :
384 ECB : static int
385 GIC 214657 : pltcl_WaitForEvent(CONST86 Tcl_Time *timePtr)
386 ECB : {
387 GIC 214657 : return 0;
388 : }
389 :
390 :
391 : /*
392 : * _PG_init() - library load-time initialization
393 : *
394 : * DO NOT make this static nor change its name!
395 : *
396 : * The work done here must be safe to do in the postmaster process,
397 : * in case the pltcl library is preloaded in the postmaster.
398 : */
399 ECB : void
400 GIC 9 : _PG_init(void)
401 : {
402 : Tcl_NotifierProcs notifier;
403 : HASHCTL hash_ctl;
404 :
405 ECB : /* Be sure we do initialization only once (should be redundant now) */
406 GBC 9 : if (pltcl_pm_init_done)
407 UIC 0 : return;
408 ECB :
409 GIC 9 : pg_bindtextdomain(TEXTDOMAIN);
410 :
411 : #ifdef WIN32
412 : /* Required on win32 to prevent error loading init.tcl */
413 : Tcl_FindExecutable("");
414 : #endif
415 :
416 : /*
417 : * Override the functions in the Notifier subsystem. See comments above.
418 ECB : */
419 CBC 9 : notifier.setTimerProc = pltcl_SetTimer;
420 9 : notifier.waitForEventProc = pltcl_WaitForEvent;
421 9 : notifier.createFileHandlerProc = pltcl_CreateFileHandler;
422 9 : notifier.deleteFileHandlerProc = pltcl_DeleteFileHandler;
423 9 : notifier.initNotifierProc = pltcl_InitNotifier;
424 9 : notifier.finalizeNotifierProc = pltcl_FinalizeNotifier;
425 9 : notifier.alertNotifierProc = pltcl_AlertNotifier;
426 9 : notifier.serviceModeHookProc = pltcl_ServiceModeHook;
427 GIC 9 : Tcl_SetNotifier(¬ifier);
428 :
429 : /************************************************************
430 : * Create the dummy hold interpreter to prevent close of
431 : * stdout and stderr on DeleteInterp
432 ECB : ************************************************************/
433 GBC 9 : if ((pltcl_hold_interp = Tcl_CreateInterp()) == NULL)
434 LBC 0 : elog(ERROR, "could not create dummy Tcl interpreter");
435 GBC 9 : if (Tcl_Init(pltcl_hold_interp) == TCL_ERROR)
436 UIC 0 : elog(ERROR, "could not initialize dummy Tcl interpreter");
437 :
438 : /************************************************************
439 : * Create the hash table for working interpreters
440 ECB : ************************************************************/
441 CBC 9 : hash_ctl.keysize = sizeof(Oid);
442 9 : hash_ctl.entrysize = sizeof(pltcl_interp_desc);
443 GIC 9 : pltcl_interp_htab = hash_create("PL/Tcl interpreters",
444 : 8,
445 : &hash_ctl,
446 : HASH_ELEM | HASH_BLOBS);
447 :
448 : /************************************************************
449 : * Create the hash table for function lookup
450 ECB : ************************************************************/
451 CBC 9 : hash_ctl.keysize = sizeof(pltcl_proc_key);
452 9 : hash_ctl.entrysize = sizeof(pltcl_proc_ptr);
453 GIC 9 : pltcl_proc_htab = hash_create("PL/Tcl functions",
454 : 100,
455 : &hash_ctl,
456 : HASH_ELEM | HASH_BLOBS);
457 :
458 : /************************************************************
459 : * Define PL/Tcl's custom GUCs
460 ECB : ************************************************************/
461 GIC 9 : DefineCustomStringVariable("pltcl.start_proc",
462 : gettext_noop("PL/Tcl function to call once when pltcl is first used."),
463 : NULL,
464 : &pltcl_start_proc,
465 : NULL,
466 : PGC_SUSET, 0,
467 ECB : NULL, NULL, NULL);
468 GIC 9 : DefineCustomStringVariable("pltclu.start_proc",
469 : gettext_noop("PL/TclU function to call once when pltclu is first used."),
470 : NULL,
471 : &pltclu_start_proc,
472 : NULL,
473 : PGC_SUSET, 0,
474 : NULL, NULL, NULL);
475 ECB :
476 CBC 9 : MarkGUCPrefixReserved("pltcl");
477 GIC 9 : MarkGUCPrefixReserved("pltclu");
478 ECB :
479 GIC 9 : pltcl_pm_init_done = true;
480 : }
481 :
482 : /**********************************************************************
483 : * pltcl_init_interp() - initialize a new Tcl interpreter
484 : **********************************************************************/
485 ECB : static void
486 GIC 11 : pltcl_init_interp(pltcl_interp_desc *interp_desc, Oid prolang, bool pltrusted)
487 : {
488 : Tcl_Interp *interp;
489 : char interpname[32];
490 :
491 : /************************************************************
492 : * Create the Tcl interpreter subsidiary to pltcl_hold_interp.
493 : * Note: Tcl automatically does Tcl_Init in the untrusted case,
494 : * and it's not wanted in the trusted case.
495 ECB : ************************************************************/
496 CBC 11 : snprintf(interpname, sizeof(interpname), "subsidiary_%u", interp_desc->user_id);
497 GIC 11 : if ((interp = Tcl_CreateSlave(pltcl_hold_interp, interpname,
498 EUB : pltrusted ? 1 : 0)) == NULL)
499 UIC 0 : elog(ERROR, "could not create subsidiary Tcl interpreter");
500 :
501 : /************************************************************
502 : * Initialize the query hash table associated with interpreter
503 ECB : ************************************************************/
504 GIC 11 : Tcl_InitHashTable(&interp_desc->query_hash, TCL_STRING_KEYS);
505 :
506 : /************************************************************
507 : * Install the commands for SPI support in the interpreter
508 ECB : ************************************************************/
509 GIC 11 : Tcl_CreateObjCommand(interp, "elog",
510 ECB : pltcl_elog, NULL, NULL);
511 GIC 11 : Tcl_CreateObjCommand(interp, "quote",
512 ECB : pltcl_quote, NULL, NULL);
513 GIC 11 : Tcl_CreateObjCommand(interp, "argisnull",
514 ECB : pltcl_argisnull, NULL, NULL);
515 GIC 11 : Tcl_CreateObjCommand(interp, "return_null",
516 ECB : pltcl_returnnull, NULL, NULL);
517 GIC 11 : Tcl_CreateObjCommand(interp, "return_next",
518 ECB : pltcl_returnnext, NULL, NULL);
519 GIC 11 : Tcl_CreateObjCommand(interp, "spi_exec",
520 ECB : pltcl_SPI_execute, NULL, NULL);
521 GIC 11 : Tcl_CreateObjCommand(interp, "spi_prepare",
522 ECB : pltcl_SPI_prepare, NULL, NULL);
523 GIC 11 : Tcl_CreateObjCommand(interp, "spi_execp",
524 ECB : pltcl_SPI_execute_plan, NULL, NULL);
525 GIC 11 : Tcl_CreateObjCommand(interp, "subtransaction",
526 ECB : pltcl_subtransaction, NULL, NULL);
527 GIC 11 : Tcl_CreateObjCommand(interp, "commit",
528 ECB : pltcl_commit, NULL, NULL);
529 GIC 11 : Tcl_CreateObjCommand(interp, "rollback",
530 : pltcl_rollback, NULL, NULL);
531 :
532 : /************************************************************
533 : * Call the appropriate start_proc, if there is one.
534 : *
535 : * We must set interp_desc->interp before the call, else the start_proc
536 : * won't find the interpreter it's supposed to use. But, if the
537 : * start_proc fails, we want to abandon use of the interpreter.
538 ECB : ************************************************************/
539 GIC 11 : PG_TRY();
540 ECB : {
541 CBC 11 : interp_desc->interp = interp;
542 GIC 11 : call_pltcl_start_proc(prolang, pltrusted);
543 ECB : }
544 GIC 3 : PG_CATCH();
545 ECB : {
546 CBC 3 : interp_desc->interp = NULL;
547 3 : Tcl_DeleteInterp(interp);
548 GIC 3 : PG_RE_THROW();
549 ECB : }
550 CBC 8 : PG_END_TRY();
551 GIC 8 : }
552 :
553 : /**********************************************************************
554 : * pltcl_fetch_interp() - fetch the Tcl interpreter to use for a function
555 : *
556 : * This also takes care of any on-first-use initialization required.
557 : **********************************************************************/
558 ECB : static pltcl_interp_desc *
559 GIC 60 : pltcl_fetch_interp(Oid prolang, bool pltrusted)
560 : {
561 : Oid user_id;
562 : pltcl_interp_desc *interp_desc;
563 : bool found;
564 :
565 ECB : /* Find or create the interpreter hashtable entry for this userid */
566 CBC 60 : if (pltrusted)
567 GIC 60 : user_id = GetUserId();
568 EUB : else
569 UIC 0 : user_id = InvalidOid;
570 ECB :
571 GIC 60 : interp_desc = hash_search(pltcl_interp_htab, &user_id,
572 : HASH_ENTER,
573 ECB : &found);
574 CBC 60 : if (!found)
575 GIC 8 : interp_desc->interp = NULL;
576 :
577 ECB : /* If we haven't yet successfully made an interpreter, try to do that */
578 CBC 60 : if (!interp_desc->interp)
579 GIC 11 : pltcl_init_interp(interp_desc, prolang, pltrusted);
580 ECB :
581 GIC 57 : return interp_desc;
582 : }
583 :
584 :
585 : /**********************************************************************
586 : * call_pltcl_start_proc() - Call user-defined initialization proc, if any
587 : **********************************************************************/
588 ECB : static void
589 GIC 11 : call_pltcl_start_proc(Oid prolang, bool pltrusted)
590 ECB : {
591 GIC 11 : LOCAL_FCINFO(fcinfo, 0);
592 : char *start_proc;
593 : const char *gucname;
594 : ErrorContextCallback errcallback;
595 : List *namelist;
596 : Oid procOid;
597 : HeapTuple procTup;
598 : Form_pg_proc procStruct;
599 : AclResult aclresult;
600 : FmgrInfo finfo;
601 : PgStat_FunctionCallUsage fcusage;
602 :
603 ECB : /* select appropriate GUC */
604 CBC 11 : start_proc = pltrusted ? pltcl_start_proc : pltclu_start_proc;
605 GIC 11 : gucname = pltrusted ? "pltcl.start_proc" : "pltclu.start_proc";
606 :
607 ECB : /* Nothing to do if it's empty or unset */
608 CBC 11 : if (start_proc == NULL || start_proc[0] == '\0')
609 GIC 7 : return;
610 :
611 ECB : /* Set up errcontext callback to make errors more helpful */
612 CBC 4 : errcallback.callback = start_proc_error_callback;
613 4 : errcallback.arg = unconstify(char *, gucname);
614 4 : errcallback.previous = error_context_stack;
615 GIC 4 : error_context_stack = &errcallback;
616 :
617 ECB : /* Parse possibly-qualified identifier and look up the function */
618 GNC 4 : namelist = stringToQualifiedNameList(start_proc, NULL);
619 GIC 4 : procOid = LookupFuncName(namelist, 0, NULL, false);
620 :
621 ECB : /* Current user must have permission to call function */
622 GNC 2 : aclresult = object_aclcheck(ProcedureRelationId, procOid, GetUserId(), ACL_EXECUTE);
623 GBC 2 : if (aclresult != ACLCHECK_OK)
624 UIC 0 : aclcheck_error(aclresult, OBJECT_FUNCTION, start_proc);
625 :
626 ECB : /* Get the function's pg_proc entry */
627 CBC 2 : procTup = SearchSysCache1(PROCOID, ObjectIdGetDatum(procOid));
628 GBC 2 : if (!HeapTupleIsValid(procTup))
629 LBC 0 : elog(ERROR, "cache lookup failed for function %u", procOid);
630 GIC 2 : procStruct = (Form_pg_proc) GETSTRUCT(procTup);
631 :
632 ECB : /* It must be same language as the function we're currently calling */
633 GBC 2 : if (procStruct->prolang != prolang)
634 UIC 0 : ereport(ERROR,
635 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
636 : errmsg("function \"%s\" is in the wrong language",
637 : start_proc)));
638 :
639 : /*
640 : * It must not be SECURITY DEFINER, either. This together with the
641 : * language match check ensures that the function will execute in the same
642 : * Tcl interpreter we just finished initializing.
643 ECB : */
644 CBC 2 : if (procStruct->prosecdef)
645 GIC 1 : ereport(ERROR,
646 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
647 : errmsg("function \"%s\" must not be SECURITY DEFINER",
648 : start_proc)));
649 :
650 ECB : /* A-OK */
651 GIC 1 : ReleaseSysCache(procTup);
652 :
653 : /*
654 : * Call the function using the normal SQL function call mechanism. We
655 : * could perhaps cheat and jump directly to pltcl_handler(), but it seems
656 : * better to do it this way so that the call is exposed to, eg, call
657 : * statistics collection.
658 ECB : */
659 CBC 1 : InvokeFunctionExecuteHook(procOid);
660 1 : fmgr_info(procOid, &finfo);
661 GIC 1 : InitFunctionCallInfoData(*fcinfo, &finfo,
662 : 0,
663 ECB : InvalidOid, NULL, NULL);
664 CBC 1 : pgstat_init_function_usage(fcinfo, &fcusage);
665 1 : (void) FunctionCallInvoke(fcinfo);
666 GIC 1 : pgstat_end_function_usage(&fcusage, true);
667 :
668 ECB : /* Pop the error context stack */
669 GIC 1 : error_context_stack = errcallback.previous;
670 : }
671 :
672 : /*
673 : * Error context callback for errors occurring during start_proc processing.
674 : */
675 ECB : static void
676 GIC 4 : start_proc_error_callback(void *arg)
677 ECB : {
678 GIC 4 : const char *gucname = (const char *) arg;
679 :
680 ECB : /* translator: %s is "pltcl.start_proc" or "pltclu.start_proc" */
681 CBC 4 : errcontext("processing %s parameter", gucname);
682 GIC 4 : }
683 :
684 :
685 : /**********************************************************************
686 : * pltcl_call_handler - This is the only visible function
687 : * of the PL interpreter. The PostgreSQL
688 : * function manager and trigger manager
689 : * call this function for execution of
690 : * PL/Tcl procedures.
691 ECB : **********************************************************************/
692 GIC 9 : PG_FUNCTION_INFO_V1(pltcl_call_handler);
693 :
694 : /* keep non-static */
695 ECB : Datum
696 GIC 216 : pltcl_call_handler(PG_FUNCTION_ARGS)
697 ECB : {
698 GIC 216 : return pltcl_handler(fcinfo, true);
699 : }
700 :
701 : /*
702 : * Alternative handler for unsafe functions
703 EUB : */
704 UIC 0 : PG_FUNCTION_INFO_V1(pltclu_call_handler);
705 :
706 : /* keep non-static */
707 EUB : Datum
708 UIC 0 : pltclu_call_handler(PG_FUNCTION_ARGS)
709 EUB : {
710 UIC 0 : return pltcl_handler(fcinfo, false);
711 : }
712 :
713 :
714 : /**********************************************************************
715 : * pltcl_handler() - Handler for function and trigger calls, for
716 : * both trusted and untrusted interpreters.
717 : **********************************************************************/
718 ECB : static Datum
719 GIC 216 : pltcl_handler(PG_FUNCTION_ARGS, bool pltrusted)
720 ECB : {
721 GIC 216 : Datum retval = (Datum) 0;
722 : pltcl_call_state current_call_state;
723 : pltcl_call_state *save_call_state;
724 :
725 : /*
726 : * Initialize current_call_state to nulls/zeroes; in particular, set its
727 : * prodesc pointer to null. Anything that sets it non-null should
728 : * increase the prodesc's fn_refcount at the same time. We'll decrease
729 : * the refcount, and then delete the prodesc if it's no longer referenced,
730 : * on the way out of this function. This ensures that prodescs live as
731 : * long as needed even if somebody replaces the originating pg_proc row
732 : * while they're executing.
733 ECB : */
734 GIC 216 : memset(¤t_call_state, 0, sizeof(current_call_state));
735 :
736 : /*
737 : * Ensure that static pointer is saved/restored properly
738 ECB : */
739 CBC 216 : save_call_state = pltcl_current_call_state;
740 GIC 216 : pltcl_current_call_state = ¤t_call_state;
741 ECB :
742 GIC 216 : PG_TRY();
743 : {
744 : /*
745 : * Determine if called as function or trigger and call appropriate
746 : * subhandler
747 ECB : */
748 GIC 216 : if (CALLED_AS_TRIGGER(fcinfo))
749 : {
750 ECB : /* invoke the trigger handler */
751 GIC 58 : retval = PointerGetDatum(pltcl_trigger_handler(fcinfo,
752 : ¤t_call_state,
753 : pltrusted));
754 ECB : }
755 GIC 158 : else if (CALLED_AS_EVENT_TRIGGER(fcinfo))
756 : {
757 ECB : /* invoke the event trigger handler */
758 CBC 10 : pltcl_event_trigger_handler(fcinfo, ¤t_call_state, pltrusted);
759 GIC 10 : retval = (Datum) 0;
760 : }
761 : else
762 : {
763 ECB : /* invoke the regular function handler */
764 CBC 148 : current_call_state.fcinfo = fcinfo;
765 GIC 148 : retval = pltcl_func_handler(fcinfo, ¤t_call_state, pltrusted);
766 : }
767 ECB : }
768 GIC 54 : PG_FINALLY();
769 : {
770 : /* Restore static pointer, then clean up the prodesc refcount if any */
771 : /*
772 : * (We're being paranoid in case an error is thrown in context
773 : * deletion)
774 ECB : */
775 CBC 216 : pltcl_current_call_state = save_call_state;
776 GIC 216 : if (current_call_state.prodesc != NULL)
777 ECB : {
778 CBC 213 : Assert(current_call_state.prodesc->fn_refcount > 0);
779 GBC 213 : if (--current_call_state.prodesc->fn_refcount == 0)
780 UIC 0 : MemoryContextDelete(current_call_state.prodesc->fn_cxt);
781 : }
782 ECB : }
783 GIC 216 : PG_END_TRY();
784 ECB :
785 GIC 162 : return retval;
786 : }
787 :
788 :
789 : /**********************************************************************
790 : * pltcl_func_handler() - Handler for regular function calls
791 : **********************************************************************/
792 ECB : static Datum
793 GIC 148 : pltcl_func_handler(PG_FUNCTION_ARGS, pltcl_call_state *call_state,
794 : bool pltrusted)
795 : {
796 : bool nonatomic;
797 : pltcl_proc_desc *prodesc;
798 : Tcl_Interp *volatile interp;
799 : Tcl_Obj *tcl_cmd;
800 : int i;
801 : int tcl_rc;
802 : Datum retval;
803 ECB :
804 CBC 331 : nonatomic = fcinfo->context &&
805 160 : IsA(fcinfo->context, CallContext) &&
806 GIC 12 : !castNode(CallContext, fcinfo->context)->atomic;
807 :
808 ECB : /* Connect to SPI manager */
809 GBC 148 : if (SPI_connect_ext(nonatomic ? SPI_OPT_NONATOMIC : 0) != SPI_OK_CONNECT)
810 UIC 0 : elog(ERROR, "could not connect to SPI manager");
811 :
812 ECB : /* Find or compile the function */
813 GIC 148 : prodesc = compile_pltcl_function(fcinfo->flinfo->fn_oid, InvalidOid,
814 : false, pltrusted);
815 ECB :
816 CBC 145 : call_state->prodesc = prodesc;
817 GIC 145 : prodesc->fn_refcount++;
818 ECB :
819 GIC 145 : interp = prodesc->interp_desc->interp;
820 :
821 : /*
822 : * If we're a SRF, check caller can handle materialize mode, and save
823 : * relevant info into call_state. We must ensure that the returned
824 : * tuplestore is owned by the caller's context, even if we first create it
825 : * inside a subtransaction.
826 ECB : */
827 GIC 145 : if (prodesc->fn_retisset)
828 ECB : {
829 GIC 5 : ReturnSetInfo *rsi = (ReturnSetInfo *) fcinfo->resultinfo;
830 ECB :
831 GBC 5 : if (!rsi || !IsA(rsi, ReturnSetInfo))
832 UIC 0 : ereport(ERROR,
833 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
834 : errmsg("set-valued function called in context that cannot accept a set")));
835 ECB :
836 GBC 5 : if (!(rsi->allowedModes & SFRM_Materialize))
837 UIC 0 : ereport(ERROR,
838 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
839 : errmsg("materialize mode required, but it is not allowed in this context")));
840 ECB :
841 CBC 5 : call_state->rsi = rsi;
842 5 : call_state->tuple_store_cxt = rsi->econtext->ecxt_per_query_memory;
843 GIC 5 : call_state->tuple_store_owner = CurrentResourceOwner;
844 : }
845 :
846 : /************************************************************
847 : * Create the tcl command to call the internal
848 : * proc in the Tcl interpreter
849 ECB : ************************************************************/
850 CBC 145 : tcl_cmd = Tcl_NewObj();
851 145 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
852 GIC 145 : Tcl_NewStringObj(prodesc->internal_proname, -1));
853 :
854 ECB : /* We hold a refcount on tcl_cmd just to be sure it stays around */
855 GIC 145 : Tcl_IncrRefCount(tcl_cmd);
856 :
857 : /************************************************************
858 : * Add all call arguments to the command
859 ECB : ************************************************************/
860 GIC 145 : PG_TRY();
861 ECB : {
862 GIC 336 : for (i = 0; i < prodesc->nargs; i++)
863 ECB : {
864 GIC 191 : if (prodesc->arg_is_rowtype[i])
865 : {
866 : /**************************************************
867 : * For tuple values, add a list for 'array set ...'
868 ECB : **************************************************/
869 GBC 7 : if (fcinfo->args[i].isnull)
870 UIC 0 : Tcl_ListObjAppendElement(NULL, tcl_cmd, Tcl_NewObj());
871 : else
872 : {
873 : HeapTupleHeader td;
874 : Oid tupType;
875 : int32 tupTypmod;
876 : TupleDesc tupdesc;
877 : HeapTupleData tmptup;
878 : Tcl_Obj *list_tmp;
879 ECB :
880 GIC 7 : td = DatumGetHeapTupleHeader(fcinfo->args[i].value);
881 ECB : /* Extract rowtype info and find a tupdesc */
882 CBC 7 : tupType = HeapTupleHeaderGetTypeId(td);
883 7 : tupTypmod = HeapTupleHeaderGetTypMod(td);
884 GIC 7 : tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
885 ECB : /* Build a temporary HeapTuple control structure */
886 CBC 7 : tmptup.t_len = HeapTupleHeaderGetDatumLength(td);
887 GIC 7 : tmptup.t_data = td;
888 ECB :
889 CBC 7 : list_tmp = pltcl_build_tuple_argument(&tmptup, tupdesc, true);
890 GIC 7 : Tcl_ListObjAppendElement(NULL, tcl_cmd, list_tmp);
891 ECB :
892 GIC 7 : ReleaseTupleDesc(tupdesc);
893 : }
894 : }
895 : else
896 : {
897 : /**************************************************
898 : * Single values are added as string element
899 : * of their external representation
900 ECB : **************************************************/
901 CBC 184 : if (fcinfo->args[i].isnull)
902 GIC 2 : Tcl_ListObjAppendElement(NULL, tcl_cmd, Tcl_NewObj());
903 : else
904 : {
905 : char *tmp;
906 ECB :
907 GIC 182 : tmp = OutputFunctionCall(&prodesc->arg_out_func[i],
908 ECB : fcinfo->args[i].value);
909 CBC 182 : UTF_BEGIN;
910 182 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
911 182 : Tcl_NewStringObj(UTF_E2U(tmp), -1));
912 182 : UTF_END;
913 GIC 182 : pfree(tmp);
914 : }
915 : }
916 : }
917 EUB : }
918 UIC 0 : PG_CATCH();
919 : {
920 EUB : /* Release refcount to free tcl_cmd */
921 UBC 0 : Tcl_DecrRefCount(tcl_cmd);
922 UIC 0 : PG_RE_THROW();
923 ECB : }
924 GIC 145 : PG_END_TRY();
925 :
926 : /************************************************************
927 : * Call the Tcl function
928 : *
929 : * We assume no PG error can be thrown directly from this call.
930 ECB : ************************************************************/
931 GIC 145 : tcl_rc = Tcl_EvalObjEx(interp, tcl_cmd, (TCL_EVAL_DIRECT | TCL_EVAL_GLOBAL));
932 :
933 ECB : /* Release refcount to free tcl_cmd (and all subsidiary objects) */
934 GIC 145 : Tcl_DecrRefCount(tcl_cmd);
935 :
936 : /************************************************************
937 : * Check for errors reported by Tcl.
938 ECB : ************************************************************/
939 CBC 145 : if (tcl_rc != TCL_OK)
940 GIC 38 : throw_tcl_error(interp, prodesc->user_proname);
941 :
942 : /************************************************************
943 : * Disconnect from SPI manager and then create the return
944 : * value datum (if the input function does a palloc for it
945 : * this must not be allocated in the SPI memory context
946 : * because SPI_finish would free it). But don't try to call
947 : * the result_in_func if we've been told to return a NULL;
948 : * the Tcl result may not be a valid value of the result type
949 : * in that case.
950 ECB : ************************************************************/
951 GBC 107 : if (SPI_finish() != SPI_OK_FINISH)
952 UIC 0 : elog(ERROR, "SPI_finish() failed");
953 ECB :
954 GIC 107 : if (prodesc->fn_retisset)
955 ECB : {
956 GIC 3 : ReturnSetInfo *rsi = call_state->rsi;
957 :
958 ECB : /* We already checked this is OK */
959 GIC 3 : rsi->returnMode = SFRM_Materialize;
960 :
961 ECB : /* If we produced any tuples, send back the result */
962 GIC 3 : if (call_state->tuple_store)
963 ECB : {
964 CBC 3 : rsi->setResult = call_state->tuple_store;
965 GIC 3 : if (call_state->ret_tupdesc)
966 : {
967 : MemoryContext oldcxt;
968 ECB :
969 CBC 3 : oldcxt = MemoryContextSwitchTo(call_state->tuple_store_cxt);
970 3 : rsi->setDesc = CreateTupleDescCopy(call_state->ret_tupdesc);
971 GIC 3 : MemoryContextSwitchTo(oldcxt);
972 : }
973 ECB : }
974 CBC 3 : retval = (Datum) 0;
975 GIC 3 : fcinfo->isnull = true;
976 ECB : }
977 GIC 104 : else if (fcinfo->isnull)
978 ECB : {
979 GIC 1 : retval = InputFunctionCall(&prodesc->result_in_func,
980 : NULL,
981 : prodesc->result_typioparam,
982 : -1);
983 ECB : }
984 GIC 103 : else if (prodesc->fn_retistuple)
985 : {
986 : TupleDesc td;
987 : HeapTuple tup;
988 : Tcl_Obj *resultObj;
989 : Tcl_Obj **resultObjv;
990 : int resultObjc;
991 :
992 : /*
993 : * Set up data about result type. XXX it's tempting to consider
994 : * caching this in the prodesc, in the common case where the rowtype
995 : * is determined by the function not the calling query. But we'd have
996 : * to be able to deal with ADD/DROP/ALTER COLUMN events when the
997 : * result type is a named composite type, so it's not exactly trivial.
998 : * Maybe worth improving someday.
999 ECB : */
1000 GIC 15 : switch (get_call_result_type(fcinfo, NULL, &td))
1001 ECB : {
1002 GIC 11 : case TYPEFUNC_COMPOSITE:
1003 ECB : /* success */
1004 CBC 11 : break;
1005 3 : case TYPEFUNC_COMPOSITE_DOMAIN:
1006 3 : Assert(prodesc->fn_retisdomain);
1007 3 : break;
1008 GIC 1 : case TYPEFUNC_RECORD:
1009 ECB : /* failed to determine actual type of RECORD */
1010 GIC 1 : ereport(ERROR,
1011 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1012 : errmsg("function returning record called in context "
1013 : "that cannot accept type record")));
1014 EUB : break;
1015 UIC 0 : default:
1016 EUB : /* result type isn't composite? */
1017 UIC 0 : elog(ERROR, "return type must be a row type");
1018 : break;
1019 : }
1020 ECB :
1021 CBC 14 : Assert(!call_state->ret_tupdesc);
1022 14 : Assert(!call_state->attinmeta);
1023 14 : call_state->ret_tupdesc = td;
1024 GIC 14 : call_state->attinmeta = TupleDescGetAttInMetadata(td);
1025 :
1026 ECB : /* Convert function result to tuple */
1027 CBC 14 : resultObj = Tcl_GetObjResult(interp);
1028 GBC 14 : if (Tcl_ListObjGetElements(interp, resultObj, &resultObjc, &resultObjv) == TCL_ERROR)
1029 UIC 0 : throw_tcl_error(interp, prodesc->user_proname);
1030 ECB :
1031 GIC 14 : tup = pltcl_build_tuple_result(interp, resultObjv, resultObjc,
1032 ECB : call_state);
1033 GIC 10 : retval = HeapTupleGetDatum(tup);
1034 : }
1035 ECB : else
1036 GIC 88 : retval = InputFunctionCall(&prodesc->result_in_func,
1037 : utf_u2e(Tcl_GetStringResult(interp)),
1038 : prodesc->result_typioparam,
1039 : -1);
1040 ECB :
1041 GIC 102 : return retval;
1042 : }
1043 :
1044 :
1045 : /**********************************************************************
1046 : * pltcl_trigger_handler() - Handler for trigger calls
1047 : **********************************************************************/
1048 ECB : static HeapTuple
1049 GIC 58 : pltcl_trigger_handler(PG_FUNCTION_ARGS, pltcl_call_state *call_state,
1050 : bool pltrusted)
1051 : {
1052 : pltcl_proc_desc *prodesc;
1053 ECB : Tcl_Interp *volatile interp;
1054 GIC 58 : TriggerData *trigdata = (TriggerData *) fcinfo->context;
1055 : char *stroid;
1056 : TupleDesc tupdesc;
1057 : volatile HeapTuple rettup;
1058 : Tcl_Obj *tcl_cmd;
1059 : Tcl_Obj *tcl_trigtup;
1060 : int tcl_rc;
1061 : int i;
1062 : const char *result;
1063 : int result_Objc;
1064 : Tcl_Obj **result_Objv;
1065 : int rc PG_USED_FOR_ASSERTS_ONLY;
1066 ECB :
1067 GIC 58 : call_state->trigdata = trigdata;
1068 :
1069 ECB : /* Connect to SPI manager */
1070 GBC 58 : if (SPI_connect() != SPI_OK_CONNECT)
1071 UIC 0 : elog(ERROR, "could not connect to SPI manager");
1072 :
1073 ECB : /* Make transition tables visible to this SPI connection */
1074 CBC 58 : rc = SPI_register_trigger_data(trigdata);
1075 GIC 58 : Assert(rc >= 0);
1076 :
1077 ECB : /* Find or compile the function */
1078 CBC 116 : prodesc = compile_pltcl_function(fcinfo->flinfo->fn_oid,
1079 GIC 58 : RelationGetRelid(trigdata->tg_relation),
1080 : false, /* not an event trigger */
1081 : pltrusted);
1082 ECB :
1083 CBC 58 : call_state->prodesc = prodesc;
1084 GIC 58 : prodesc->fn_refcount++;
1085 ECB :
1086 GIC 58 : interp = prodesc->interp_desc->interp;
1087 ECB :
1088 GIC 58 : tupdesc = RelationGetDescr(trigdata->tg_relation);
1089 :
1090 : /************************************************************
1091 : * Create the tcl command to call the internal
1092 : * proc in the interpreter
1093 ECB : ************************************************************/
1094 CBC 58 : tcl_cmd = Tcl_NewObj();
1095 GIC 58 : Tcl_IncrRefCount(tcl_cmd);
1096 ECB :
1097 GIC 58 : PG_TRY();
1098 : {
1099 ECB : /* The procedure name (note this is all ASCII, so no utf_e2u) */
1100 CBC 58 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1101 GIC 58 : Tcl_NewStringObj(prodesc->internal_proname, -1));
1102 :
1103 ECB : /* The trigger name for argument TG_name */
1104 CBC 58 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1105 GIC 58 : Tcl_NewStringObj(utf_e2u(trigdata->tg_trigger->tgname), -1));
1106 :
1107 : /* The oid of the trigger relation for argument TG_relid */
1108 ECB : /* Consider not converting to a string for more performance? */
1109 GIC 58 : stroid = DatumGetCString(DirectFunctionCall1(oidout,
1110 ECB : ObjectIdGetDatum(trigdata->tg_relation->rd_id)));
1111 GIC 58 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1112 ECB : Tcl_NewStringObj(stroid, -1));
1113 GIC 58 : pfree(stroid);
1114 :
1115 ECB : /* The name of the table the trigger is acting on: TG_table_name */
1116 CBC 58 : stroid = SPI_getrelname(trigdata->tg_relation);
1117 58 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1118 58 : Tcl_NewStringObj(utf_e2u(stroid), -1));
1119 GIC 58 : pfree(stroid);
1120 :
1121 ECB : /* The schema of the table the trigger is acting on: TG_table_schema */
1122 CBC 58 : stroid = SPI_getnspname(trigdata->tg_relation);
1123 58 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1124 58 : Tcl_NewStringObj(utf_e2u(stroid), -1));
1125 GIC 58 : pfree(stroid);
1126 :
1127 ECB : /* A list of attribute names for argument TG_relatts */
1128 CBC 58 : tcl_trigtup = Tcl_NewObj();
1129 58 : Tcl_ListObjAppendElement(NULL, tcl_trigtup, Tcl_NewObj());
1130 GIC 258 : for (i = 0; i < tupdesc->natts; i++)
1131 ECB : {
1132 GIC 200 : Form_pg_attribute att = TupleDescAttr(tupdesc, i);
1133 ECB :
1134 CBC 200 : if (att->attisdropped)
1135 GIC 13 : Tcl_ListObjAppendElement(NULL, tcl_trigtup, Tcl_NewObj());
1136 ECB : else
1137 CBC 187 : Tcl_ListObjAppendElement(NULL, tcl_trigtup,
1138 GIC 187 : Tcl_NewStringObj(utf_e2u(NameStr(att->attname)), -1));
1139 ECB : }
1140 GIC 58 : Tcl_ListObjAppendElement(NULL, tcl_cmd, tcl_trigtup);
1141 :
1142 ECB : /* The when part of the event for TG_when */
1143 CBC 58 : if (TRIGGER_FIRED_BEFORE(trigdata->tg_event))
1144 GIC 47 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1145 ECB : Tcl_NewStringObj("BEFORE", -1));
1146 CBC 11 : else if (TRIGGER_FIRED_AFTER(trigdata->tg_event))
1147 GIC 8 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1148 ECB : Tcl_NewStringObj("AFTER", -1));
1149 CBC 3 : else if (TRIGGER_FIRED_INSTEAD(trigdata->tg_event))
1150 GIC 3 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1151 : Tcl_NewStringObj("INSTEAD OF", -1));
1152 EUB : else
1153 UIC 0 : elog(ERROR, "unrecognized WHEN tg_event: %u", trigdata->tg_event);
1154 :
1155 ECB : /* The level part of the event for TG_level */
1156 GIC 58 : if (TRIGGER_FIRED_FOR_ROW(trigdata->tg_event))
1157 ECB : {
1158 GIC 50 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1159 : Tcl_NewStringObj("ROW", -1));
1160 :
1161 : /*
1162 : * Now the command part of the event for TG_op and data for NEW
1163 : * and OLD
1164 : *
1165 : * Note: In BEFORE trigger, stored generated columns are not
1166 : * computed yet, so don't make them accessible in NEW row.
1167 ECB : */
1168 GIC 50 : if (TRIGGER_FIRED_BY_INSERT(trigdata->tg_event))
1169 ECB : {
1170 GIC 30 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1171 : Tcl_NewStringObj("INSERT", -1));
1172 ECB :
1173 GIC 30 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1174 : pltcl_build_tuple_argument(trigdata->tg_trigtuple,
1175 ECB : tupdesc,
1176 CBC 30 : !TRIGGER_FIRED_BEFORE(trigdata->tg_event)));
1177 GIC 30 : Tcl_ListObjAppendElement(NULL, tcl_cmd, Tcl_NewObj());
1178 ECB :
1179 GIC 30 : rettup = trigdata->tg_trigtuple;
1180 ECB : }
1181 GIC 20 : else if (TRIGGER_FIRED_BY_DELETE(trigdata->tg_event))
1182 ECB : {
1183 GIC 8 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1184 : Tcl_NewStringObj("DELETE", -1));
1185 ECB :
1186 CBC 8 : Tcl_ListObjAppendElement(NULL, tcl_cmd, Tcl_NewObj());
1187 GIC 8 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1188 : pltcl_build_tuple_argument(trigdata->tg_trigtuple,
1189 : tupdesc,
1190 : true));
1191 ECB :
1192 GIC 8 : rettup = trigdata->tg_trigtuple;
1193 ECB : }
1194 GIC 12 : else if (TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
1195 ECB : {
1196 GIC 12 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1197 : Tcl_NewStringObj("UPDATE", -1));
1198 ECB :
1199 GIC 12 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1200 : pltcl_build_tuple_argument(trigdata->tg_newtuple,
1201 ECB : tupdesc,
1202 CBC 12 : !TRIGGER_FIRED_BEFORE(trigdata->tg_event)));
1203 GIC 12 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1204 : pltcl_build_tuple_argument(trigdata->tg_trigtuple,
1205 : tupdesc,
1206 : true));
1207 ECB :
1208 GIC 12 : rettup = trigdata->tg_newtuple;
1209 : }
1210 EUB : else
1211 UIC 0 : elog(ERROR, "unrecognized OP tg_event: %u", trigdata->tg_event);
1212 ECB : }
1213 GIC 8 : else if (TRIGGER_FIRED_FOR_STATEMENT(trigdata->tg_event))
1214 ECB : {
1215 GIC 8 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1216 : Tcl_NewStringObj("STATEMENT", -1));
1217 ECB :
1218 CBC 8 : if (TRIGGER_FIRED_BY_INSERT(trigdata->tg_event))
1219 GIC 3 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1220 ECB : Tcl_NewStringObj("INSERT", -1));
1221 CBC 5 : else if (TRIGGER_FIRED_BY_DELETE(trigdata->tg_event))
1222 GIC 1 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1223 ECB : Tcl_NewStringObj("DELETE", -1));
1224 CBC 4 : else if (TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
1225 GIC 3 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1226 ECB : Tcl_NewStringObj("UPDATE", -1));
1227 CBC 1 : else if (TRIGGER_FIRED_BY_TRUNCATE(trigdata->tg_event))
1228 GIC 1 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1229 : Tcl_NewStringObj("TRUNCATE", -1));
1230 EUB : else
1231 UIC 0 : elog(ERROR, "unrecognized OP tg_event: %u", trigdata->tg_event);
1232 ECB :
1233 CBC 8 : Tcl_ListObjAppendElement(NULL, tcl_cmd, Tcl_NewObj());
1234 GIC 8 : Tcl_ListObjAppendElement(NULL, tcl_cmd, Tcl_NewObj());
1235 ECB :
1236 GIC 8 : rettup = (HeapTuple) NULL;
1237 : }
1238 EUB : else
1239 UIC 0 : elog(ERROR, "unrecognized LEVEL tg_event: %u", trigdata->tg_event);
1240 :
1241 ECB : /* Finally append the arguments from CREATE TRIGGER */
1242 CBC 135 : for (i = 0; i < trigdata->tg_trigger->tgnargs; i++)
1243 77 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1244 GIC 77 : Tcl_NewStringObj(utf_e2u(trigdata->tg_trigger->tgargs[i]), -1));
1245 EUB : }
1246 UIC 0 : PG_CATCH();
1247 EUB : {
1248 UBC 0 : Tcl_DecrRefCount(tcl_cmd);
1249 UIC 0 : PG_RE_THROW();
1250 ECB : }
1251 GIC 58 : PG_END_TRY();
1252 :
1253 : /************************************************************
1254 : * Call the Tcl function
1255 : *
1256 : * We assume no PG error can be thrown directly from this call.
1257 ECB : ************************************************************/
1258 GIC 58 : tcl_rc = Tcl_EvalObjEx(interp, tcl_cmd, (TCL_EVAL_DIRECT | TCL_EVAL_GLOBAL));
1259 :
1260 ECB : /* Release refcount to free tcl_cmd (and all subsidiary objects) */
1261 GIC 58 : Tcl_DecrRefCount(tcl_cmd);
1262 :
1263 : /************************************************************
1264 : * Check for errors reported by Tcl.
1265 ECB : ************************************************************/
1266 CBC 58 : if (tcl_rc != TCL_OK)
1267 GIC 7 : throw_tcl_error(interp, prodesc->user_proname);
1268 :
1269 : /************************************************************
1270 : * Exit SPI environment.
1271 ECB : ************************************************************/
1272 GBC 51 : if (SPI_finish() != SPI_OK_FINISH)
1273 UIC 0 : elog(ERROR, "SPI_finish() failed");
1274 :
1275 : /************************************************************
1276 : * The return value from the procedure might be one of
1277 : * the magic strings OK or SKIP, or a list from array get.
1278 : * We can check for OK or SKIP without worrying about encoding.
1279 ECB : ************************************************************/
1280 GIC 51 : result = Tcl_GetStringResult(interp);
1281 ECB :
1282 CBC 51 : if (strcmp(result, "OK") == 0)
1283 40 : return rettup;
1284 11 : if (strcmp(result, "SKIP") == 0)
1285 GIC 1 : return (HeapTuple) NULL;
1286 :
1287 : /************************************************************
1288 : * Otherwise, the return value should be a column name/value list
1289 : * specifying the modified tuple to return.
1290 ECB : ************************************************************/
1291 GIC 10 : if (Tcl_ListObjGetElements(interp, Tcl_GetObjResult(interp),
1292 EUB : &result_Objc, &result_Objv) != TCL_OK)
1293 UIC 0 : ereport(ERROR,
1294 : (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
1295 : errmsg("could not split return value from trigger: %s",
1296 : utf_u2e(Tcl_GetStringResult(interp)))));
1297 :
1298 ECB : /* Convert function result to tuple */
1299 GIC 10 : rettup = pltcl_build_tuple_result(interp, result_Objv, result_Objc,
1300 : call_state);
1301 ECB :
1302 GIC 9 : return rettup;
1303 : }
1304 :
1305 : /**********************************************************************
1306 : * pltcl_event_trigger_handler() - Handler for event trigger calls
1307 : **********************************************************************/
1308 ECB : static void
1309 GIC 10 : pltcl_event_trigger_handler(PG_FUNCTION_ARGS, pltcl_call_state *call_state,
1310 : bool pltrusted)
1311 : {
1312 : pltcl_proc_desc *prodesc;
1313 ECB : Tcl_Interp *volatile interp;
1314 GIC 10 : EventTriggerData *tdata = (EventTriggerData *) fcinfo->context;
1315 : Tcl_Obj *tcl_cmd;
1316 : int tcl_rc;
1317 :
1318 ECB : /* Connect to SPI manager */
1319 GBC 10 : if (SPI_connect() != SPI_OK_CONNECT)
1320 UIC 0 : elog(ERROR, "could not connect to SPI manager");
1321 :
1322 ECB : /* Find or compile the function */
1323 GIC 10 : prodesc = compile_pltcl_function(fcinfo->flinfo->fn_oid,
1324 : InvalidOid, true, pltrusted);
1325 ECB :
1326 CBC 10 : call_state->prodesc = prodesc;
1327 GIC 10 : prodesc->fn_refcount++;
1328 ECB :
1329 GIC 10 : interp = prodesc->interp_desc->interp;
1330 :
1331 ECB : /* Create the tcl command and call the internal proc */
1332 CBC 10 : tcl_cmd = Tcl_NewObj();
1333 10 : Tcl_IncrRefCount(tcl_cmd);
1334 10 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1335 10 : Tcl_NewStringObj(prodesc->internal_proname, -1));
1336 10 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1337 10 : Tcl_NewStringObj(utf_e2u(tdata->event), -1));
1338 10 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1339 GIC 10 : Tcl_NewStringObj(utf_e2u(GetCommandTagName(tdata->tag)),
1340 : -1));
1341 ECB :
1342 GIC 10 : tcl_rc = Tcl_EvalObjEx(interp, tcl_cmd, (TCL_EVAL_DIRECT | TCL_EVAL_GLOBAL));
1343 :
1344 ECB : /* Release refcount to free tcl_cmd (and all subsidiary objects) */
1345 GIC 10 : Tcl_DecrRefCount(tcl_cmd);
1346 :
1347 ECB : /* Check for errors reported by Tcl. */
1348 GBC 10 : if (tcl_rc != TCL_OK)
1349 UIC 0 : throw_tcl_error(interp, prodesc->user_proname);
1350 ECB :
1351 GBC 10 : if (SPI_finish() != SPI_OK_FINISH)
1352 LBC 0 : elog(ERROR, "SPI_finish() failed");
1353 GIC 10 : }
1354 :
1355 :
1356 : /**********************************************************************
1357 : * throw_tcl_error - ereport an error returned from the Tcl interpreter
1358 : **********************************************************************/
1359 ECB : static void
1360 GIC 45 : throw_tcl_error(Tcl_Interp *interp, const char *proname)
1361 : {
1362 : /*
1363 : * Caution is needed here because Tcl_GetVar could overwrite the
1364 : * interpreter result (even though it's not really supposed to), and we
1365 : * can't control the order of evaluation of ereport arguments. Hence, make
1366 : * real sure we have our own copy of the result string before invoking
1367 : * Tcl_GetVar.
1368 : */
1369 : char *emsg;
1370 : char *econtext;
1371 ECB :
1372 CBC 45 : emsg = pstrdup(utf_u2e(Tcl_GetStringResult(interp)));
1373 45 : econtext = utf_u2e(Tcl_GetVar(interp, "errorInfo", TCL_GLOBAL_ONLY));
1374 GIC 45 : ereport(ERROR,
1375 : (errcode(ERRCODE_EXTERNAL_ROUTINE_EXCEPTION),
1376 : errmsg("%s", emsg),
1377 : errcontext("%s\nin PL/Tcl function \"%s\"",
1378 : econtext, proname)));
1379 : }
1380 :
1381 :
1382 : /**********************************************************************
1383 : * compile_pltcl_function - compile (or hopefully just look up) function
1384 : *
1385 : * tgreloid is the OID of the relation when compiling a trigger, or zero
1386 : * (InvalidOid) when compiling a plain function.
1387 : **********************************************************************/
1388 ECB : static pltcl_proc_desc *
1389 GIC 216 : compile_pltcl_function(Oid fn_oid, Oid tgreloid,
1390 : bool is_event_trigger, bool pltrusted)
1391 : {
1392 : HeapTuple procTup;
1393 : Form_pg_proc procStruct;
1394 : pltcl_proc_key proc_key;
1395 : pltcl_proc_ptr *proc_ptr;
1396 : bool found;
1397 : pltcl_proc_desc *prodesc;
1398 ECB : pltcl_proc_desc *old_prodesc;
1399 GIC 216 : volatile MemoryContext proc_cxt = NULL;
1400 : Tcl_DString proc_internal_def;
1401 : Tcl_DString proc_internal_body;
1402 :
1403 ECB : /* We'll need the pg_proc tuple in any case... */
1404 CBC 216 : procTup = SearchSysCache1(PROCOID, ObjectIdGetDatum(fn_oid));
1405 GBC 216 : if (!HeapTupleIsValid(procTup))
1406 LBC 0 : elog(ERROR, "cache lookup failed for function %u", fn_oid);
1407 GIC 216 : procStruct = (Form_pg_proc) GETSTRUCT(procTup);
1408 :
1409 : /*
1410 : * Look up function in pltcl_proc_htab; if it's not there, create an entry
1411 : * and set the entry's proc_ptr to NULL.
1412 ECB : */
1413 CBC 216 : proc_key.proc_id = fn_oid;
1414 216 : proc_key.is_trigger = OidIsValid(tgreloid);
1415 GIC 216 : proc_key.user_id = pltrusted ? GetUserId() : InvalidOid;
1416 ECB :
1417 GIC 216 : proc_ptr = hash_search(pltcl_proc_htab, &proc_key,
1418 : HASH_ENTER,
1419 ECB : &found);
1420 CBC 216 : if (!found)
1421 GIC 56 : proc_ptr->proc_ptr = NULL;
1422 ECB :
1423 GIC 216 : prodesc = proc_ptr->proc_ptr;
1424 :
1425 : /************************************************************
1426 : * If it's present, must check whether it's still up to date.
1427 : * This is needed because CREATE OR REPLACE FUNCTION can modify the
1428 : * function's pg_proc entry without changing its OID.
1429 ECB : ************************************************************/
1430 CBC 216 : if (prodesc != NULL &&
1431 157 : prodesc->fn_xmin == HeapTupleHeaderGetRawXmin(procTup->t_data) &&
1432 GIC 156 : ItemPointerEquals(&prodesc->fn_tid, &procTup->t_self))
1433 : {
1434 ECB : /* It's still up-to-date, so we can use it */
1435 CBC 156 : ReleaseSysCache(procTup);
1436 GIC 156 : return prodesc;
1437 : }
1438 :
1439 : /************************************************************
1440 : * If we haven't found it in the hashtable, we analyze
1441 : * the functions arguments and returntype and store
1442 : * the in-/out-functions in the prodesc block and create
1443 : * a new hashtable entry for it.
1444 : *
1445 : * Then we load the procedure into the Tcl interpreter.
1446 ECB : ************************************************************/
1447 CBC 60 : Tcl_DStringInit(&proc_internal_def);
1448 60 : Tcl_DStringInit(&proc_internal_body);
1449 GIC 60 : PG_TRY();
1450 ECB : {
1451 GIC 60 : bool is_trigger = OidIsValid(tgreloid);
1452 : char internal_proname[128];
1453 : HeapTuple typeTup;
1454 : Form_pg_type typeStruct;
1455 : char proc_internal_args[33 * FUNC_MAX_ARGS];
1456 : Datum prosrcdatum;
1457 : char *proc_source;
1458 : char buf[48];
1459 : Tcl_Interp *interp;
1460 : int i;
1461 : int tcl_rc;
1462 : MemoryContext oldcontext;
1463 :
1464 : /************************************************************
1465 : * Build our internal proc name from the function's Oid. Append
1466 : * "_trigger" when appropriate to ensure the normal and trigger
1467 ECB : * cases are kept separate. Note name must be all-ASCII.
1468 : ************************************************************/
1469 GIC 60 : if (is_event_trigger)
1470 CBC 1 : snprintf(internal_proname, sizeof(internal_proname),
1471 ECB : "__PLTcl_proc_%u_evttrigger", fn_oid);
1472 GIC 59 : else if (is_trigger)
1473 8 : snprintf(internal_proname, sizeof(internal_proname),
1474 ECB : "__PLTcl_proc_%u_trigger", fn_oid);
1475 : else
1476 GIC 51 : snprintf(internal_proname, sizeof(internal_proname),
1477 : "__PLTcl_proc_%u", fn_oid);
1478 :
1479 : /************************************************************
1480 ECB : * Allocate a context that will hold all PG data for the procedure.
1481 : ************************************************************/
1482 GIC 60 : proc_cxt = AllocSetContextCreate(TopMemoryContext,
1483 : "PL/Tcl function",
1484 : ALLOCSET_SMALL_SIZES);
1485 :
1486 : /************************************************************
1487 : * Allocate and fill a new procedure description block.
1488 ECB : * struct prodesc and subsidiary data must all live in proc_cxt.
1489 : ************************************************************/
1490 CBC 60 : oldcontext = MemoryContextSwitchTo(proc_cxt);
1491 60 : prodesc = (pltcl_proc_desc *) palloc0(sizeof(pltcl_proc_desc));
1492 60 : prodesc->user_proname = pstrdup(NameStr(procStruct->proname));
1493 60 : MemoryContextSetIdentifier(proc_cxt, prodesc->user_proname);
1494 60 : prodesc->internal_proname = pstrdup(internal_proname);
1495 60 : prodesc->fn_cxt = proc_cxt;
1496 60 : prodesc->fn_refcount = 0;
1497 60 : prodesc->fn_xmin = HeapTupleHeaderGetRawXmin(procTup->t_data);
1498 60 : prodesc->fn_tid = procTup->t_self;
1499 60 : prodesc->nargs = procStruct->pronargs;
1500 60 : prodesc->arg_out_func = (FmgrInfo *) palloc0(prodesc->nargs * sizeof(FmgrInfo));
1501 GIC 60 : prodesc->arg_is_rowtype = (bool *) palloc0(prodesc->nargs * sizeof(bool));
1502 60 : MemoryContextSwitchTo(oldcontext);
1503 ECB :
1504 : /* Remember if function is STABLE/IMMUTABLE */
1505 GIC 60 : prodesc->fn_readonly =
1506 CBC 60 : (procStruct->provolatile != PROVOLATILE_VOLATILE);
1507 : /* And whether it is trusted */
1508 GIC 60 : prodesc->lanpltrusted = pltrusted;
1509 :
1510 : /************************************************************
1511 ECB : * Identify the interpreter to use for the function
1512 : ************************************************************/
1513 CBC 117 : prodesc->interp_desc = pltcl_fetch_interp(procStruct->prolang,
1514 GIC 60 : prodesc->lanpltrusted);
1515 57 : interp = prodesc->interp_desc->interp;
1516 :
1517 : /************************************************************
1518 : * Get the required information for input conversion of the
1519 ECB : * return value.
1520 : ************************************************************/
1521 CBC 57 : if (!is_trigger && !is_event_trigger)
1522 : {
1523 48 : Oid rettype = procStruct->prorettype;
1524 ECB :
1525 GBC 48 : typeTup = SearchSysCache1(TYPEOID, ObjectIdGetDatum(rettype));
1526 CBC 48 : if (!HeapTupleIsValid(typeTup))
1527 UIC 0 : elog(ERROR, "cache lookup failed for type %u", rettype);
1528 GIC 48 : typeStruct = (Form_pg_type) GETSTRUCT(typeTup);
1529 ECB :
1530 : /* Disallow pseudotype result, except VOID and RECORD */
1531 CBC 48 : if (typeStruct->typtype == TYPTYPE_PSEUDO)
1532 : {
1533 GIC 23 : if (rettype == VOIDOID ||
1534 EUB : rettype == RECORDOID)
1535 : /* okay */ ;
1536 UBC 0 : else if (rettype == TRIGGEROID ||
1537 : rettype == EVENT_TRIGGEROID)
1538 UIC 0 : ereport(ERROR,
1539 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1540 EUB : errmsg("trigger functions can only be called as triggers")));
1541 : else
1542 UIC 0 : ereport(ERROR,
1543 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1544 : errmsg("PL/Tcl functions cannot return type %s",
1545 : format_type_be(rettype))));
1546 ECB : }
1547 :
1548 GIC 48 : prodesc->result_typid = rettype;
1549 48 : fmgr_info_cxt(typeStruct->typinput,
1550 ECB : &(prodesc->result_in_func),
1551 : proc_cxt);
1552 CBC 48 : prodesc->result_typioparam = getTypeIOParam(typeTup);
1553 ECB :
1554 CBC 48 : prodesc->fn_retisset = procStruct->proretset;
1555 48 : prodesc->fn_retistuple = type_is_rowtype(rettype);
1556 GIC 48 : prodesc->fn_retisdomain = (typeStruct->typtype == TYPTYPE_DOMAIN);
1557 CBC 48 : prodesc->domain_info = NULL;
1558 :
1559 GIC 48 : ReleaseSysCache(typeTup);
1560 : }
1561 :
1562 : /************************************************************
1563 : * Get the required information for output conversion
1564 ECB : * of all procedure arguments, and set up argument naming info.
1565 : ************************************************************/
1566 CBC 57 : if (!is_trigger && !is_event_trigger)
1567 ECB : {
1568 GIC 48 : proc_internal_args[0] = '\0';
1569 CBC 91 : for (i = 0; i < prodesc->nargs; i++)
1570 : {
1571 43 : Oid argtype = procStruct->proargtypes.values[i];
1572 ECB :
1573 GBC 43 : typeTup = SearchSysCache1(TYPEOID, ObjectIdGetDatum(argtype));
1574 CBC 43 : if (!HeapTupleIsValid(typeTup))
1575 UIC 0 : elog(ERROR, "cache lookup failed for type %u", argtype);
1576 GIC 43 : typeStruct = (Form_pg_type) GETSTRUCT(typeTup);
1577 ECB :
1578 : /* Disallow pseudotype argument, except RECORD */
1579 GBC 43 : if (typeStruct->typtype == TYPTYPE_PSEUDO &&
1580 : argtype != RECORDOID)
1581 UIC 0 : ereport(ERROR,
1582 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1583 : errmsg("PL/Tcl functions cannot accept type %s",
1584 ECB : format_type_be(argtype))));
1585 :
1586 CBC 43 : if (type_is_rowtype(argtype))
1587 ECB : {
1588 GIC 4 : prodesc->arg_is_rowtype[i] = true;
1589 4 : snprintf(buf, sizeof(buf), "__PLTcl_Tup_%d", i + 1);
1590 : }
1591 ECB : else
1592 : {
1593 CBC 39 : prodesc->arg_is_rowtype[i] = false;
1594 GIC 39 : fmgr_info_cxt(typeStruct->typoutput,
1595 CBC 39 : &(prodesc->arg_out_func[i]),
1596 : proc_cxt);
1597 GIC 39 : snprintf(buf, sizeof(buf), "%d", i + 1);
1598 ECB : }
1599 :
1600 CBC 43 : if (i > 0)
1601 GIC 14 : strcat(proc_internal_args, " ");
1602 CBC 43 : strcat(proc_internal_args, buf);
1603 :
1604 GIC 43 : ReleaseSysCache(typeTup);
1605 ECB : }
1606 : }
1607 GIC 9 : else if (is_trigger)
1608 ECB : {
1609 : /* trigger procedure has fixed args */
1610 GIC 8 : strcpy(proc_internal_args,
1611 ECB : "TG_name TG_relid TG_table_name TG_table_schema TG_relatts TG_when TG_level TG_op __PLTcl_Tup_NEW __PLTcl_Tup_OLD args");
1612 : }
1613 GIC 1 : else if (is_event_trigger)
1614 ECB : {
1615 : /* event trigger procedure has fixed args */
1616 GIC 1 : strcpy(proc_internal_args, "TG_event TG_tag");
1617 : }
1618 :
1619 : /************************************************************
1620 : * Create the tcl command to define the internal
1621 : * procedure
1622 : *
1623 : * Leave this code as DString - performance is not critical here,
1624 : * and we don't want to duplicate the knowledge of the Tcl quoting
1625 ECB : * rules that's embedded in Tcl_DStringAppendElement.
1626 : ************************************************************/
1627 CBC 57 : Tcl_DStringAppendElement(&proc_internal_def, "proc");
1628 GIC 57 : Tcl_DStringAppendElement(&proc_internal_def, internal_proname);
1629 57 : Tcl_DStringAppendElement(&proc_internal_def, proc_internal_args);
1630 :
1631 : /************************************************************
1632 : * prefix procedure body with
1633 : * upvar #0 <internal_proname> GD
1634 ECB : * and with appropriate setting of arguments
1635 : ************************************************************/
1636 CBC 57 : Tcl_DStringAppend(&proc_internal_body, "upvar #0 ", -1);
1637 57 : Tcl_DStringAppend(&proc_internal_body, internal_proname, -1);
1638 GIC 57 : Tcl_DStringAppend(&proc_internal_body, " GD\n", -1);
1639 CBC 57 : if (is_trigger)
1640 : {
1641 8 : Tcl_DStringAppend(&proc_internal_body,
1642 : "array set NEW $__PLTcl_Tup_NEW\n", -1);
1643 8 : Tcl_DStringAppend(&proc_internal_body,
1644 : "array set OLD $__PLTcl_Tup_OLD\n", -1);
1645 GIC 8 : Tcl_DStringAppend(&proc_internal_body,
1646 : "set i 0\n"
1647 : "set v 0\n"
1648 : "foreach v $args {\n"
1649 : " incr i\n"
1650 : " set $i $v\n"
1651 : "}\n"
1652 ECB : "unset i v\n\n", -1);
1653 : }
1654 GIC 49 : else if (is_event_trigger)
1655 : {
1656 : /* no argument support for event triggers */
1657 : }
1658 ECB : else
1659 : {
1660 CBC 91 : for (i = 0; i < prodesc->nargs; i++)
1661 : {
1662 43 : if (prodesc->arg_is_rowtype[i])
1663 : {
1664 GIC 4 : snprintf(buf, sizeof(buf),
1665 ECB : "array set %d $__PLTcl_Tup_%d\n",
1666 : i + 1, i + 1);
1667 GIC 4 : Tcl_DStringAppend(&proc_internal_body, buf, -1);
1668 : }
1669 : }
1670 : }
1671 :
1672 : /************************************************************
1673 ECB : * Add user's function definition to proc body
1674 : ************************************************************/
1675 GNC 57 : prosrcdatum = SysCacheGetAttrNotNull(PROCOID, procTup,
1676 : Anum_pg_proc_prosrc);
1677 CBC 57 : proc_source = TextDatumGetCString(prosrcdatum);
1678 57 : UTF_BEGIN;
1679 57 : Tcl_DStringAppend(&proc_internal_body, UTF_E2U(proc_source), -1);
1680 GIC 57 : UTF_END;
1681 57 : pfree(proc_source);
1682 57 : Tcl_DStringAppendElement(&proc_internal_def,
1683 57 : Tcl_DStringValue(&proc_internal_body));
1684 ECB :
1685 : /************************************************************
1686 : * Create the procedure in the interpreter
1687 : ************************************************************/
1688 CBC 114 : tcl_rc = Tcl_EvalEx(interp,
1689 GBC 57 : Tcl_DStringValue(&proc_internal_def),
1690 : Tcl_DStringLength(&proc_internal_def),
1691 : TCL_EVAL_GLOBAL);
1692 GIC 57 : if (tcl_rc != TCL_OK)
1693 UIC 0 : ereport(ERROR,
1694 : (errcode(ERRCODE_EXTERNAL_ROUTINE_EXCEPTION),
1695 ECB : errmsg("could not create internal procedure \"%s\": %s",
1696 : internal_proname,
1697 : utf_u2e(Tcl_GetStringResult(interp)))));
1698 : }
1699 GIC 3 : PG_CATCH();
1700 : {
1701 ECB : /*
1702 : * If we failed anywhere above, clean up whatever got allocated. It
1703 : * should all be in the proc_cxt, except for the DStrings.
1704 : */
1705 CBC 3 : if (proc_cxt)
1706 GIC 3 : MemoryContextDelete(proc_cxt);
1707 CBC 3 : Tcl_DStringFree(&proc_internal_def);
1708 GIC 3 : Tcl_DStringFree(&proc_internal_body);
1709 3 : PG_RE_THROW();
1710 : }
1711 57 : PG_END_TRY();
1712 :
1713 : /*
1714 : * Install the new proc description block in the hashtable, incrementing
1715 : * its refcount (the hashtable link counts as a reference). Then, if
1716 : * there was a previous definition of the function, decrement that one's
1717 : * refcount, and delete it if no longer referenced. The order of
1718 : * operations here is important: if something goes wrong during the
1719 ECB : * MemoryContextDelete, leaking some memory for the old definition is OK,
1720 : * but we don't want to corrupt the live hashtable entry. (Likewise,
1721 : * freeing the DStrings is pretty low priority if that happens.)
1722 : */
1723 GIC 57 : old_prodesc = proc_ptr->proc_ptr;
1724 ECB :
1725 GIC 57 : proc_ptr->proc_ptr = prodesc;
1726 CBC 57 : prodesc->fn_refcount++;
1727 ECB :
1728 CBC 57 : if (old_prodesc != NULL)
1729 : {
1730 GIC 1 : Assert(old_prodesc->fn_refcount > 0);
1731 CBC 1 : if (--old_prodesc->fn_refcount == 0)
1732 1 : MemoryContextDelete(old_prodesc->fn_cxt);
1733 : }
1734 ECB :
1735 GIC 57 : Tcl_DStringFree(&proc_internal_def);
1736 CBC 57 : Tcl_DStringFree(&proc_internal_body);
1737 :
1738 GIC 57 : ReleaseSysCache(procTup);
1739 :
1740 57 : return prodesc;
1741 : }
1742 :
1743 :
1744 ECB : /**********************************************************************
1745 : * pltcl_elog() - elog() support for PLTcl
1746 : **********************************************************************/
1747 : static int
1748 GIC 266 : pltcl_elog(ClientData cdata, Tcl_Interp *interp,
1749 : int objc, Tcl_Obj *const objv[])
1750 : {
1751 : volatile int level;
1752 : MemoryContext oldcontext;
1753 : int priIndex;
1754 :
1755 : static const char *logpriorities[] = {
1756 : "DEBUG", "LOG", "INFO", "NOTICE",
1757 : "WARNING", "ERROR", "FATAL", (const char *) NULL
1758 : };
1759 :
1760 : static const int loglevels[] = {
1761 ECB : DEBUG2, LOG, INFO, NOTICE,
1762 : WARNING, ERROR, FATAL
1763 : };
1764 :
1765 GIC 266 : if (objc != 3)
1766 : {
1767 CBC 1 : Tcl_WrongNumArgs(interp, 1, objv, "level msg");
1768 GIC 1 : return TCL_ERROR;
1769 ECB : }
1770 :
1771 CBC 265 : if (Tcl_GetIndexFromObj(interp, objv[1], logpriorities, "priority",
1772 : TCL_EXACT, &priIndex) != TCL_OK)
1773 1 : return TCL_ERROR;
1774 :
1775 GIC 264 : level = loglevels[priIndex];
1776 :
1777 264 : if (level == ERROR)
1778 : {
1779 : /*
1780 ECB : * We just pass the error back to Tcl. If it's not caught, it'll
1781 : * eventually get converted to a PG error when we reach the call
1782 : * handler.
1783 : */
1784 GIC 6 : Tcl_SetObjResult(interp, objv[2]);
1785 6 : return TCL_ERROR;
1786 : }
1787 :
1788 : /*
1789 : * For non-error messages, just pass 'em to ereport(). We do not expect
1790 : * that this will fail, but just on the off chance it does, report the
1791 : * error back to Tcl. Note we are assuming that ereport() can't have any
1792 : * internal failures that are so bad as to require a transaction abort.
1793 ECB : *
1794 : * This path is also used for FATAL errors, which aren't going to come
1795 : * back to us at all.
1796 : */
1797 CBC 258 : oldcontext = CurrentMemoryContext;
1798 GIC 258 : PG_TRY();
1799 : {
1800 CBC 258 : UTF_BEGIN;
1801 GIC 258 : ereport(level,
1802 EUB : (errcode(ERRCODE_EXTERNAL_ROUTINE_EXCEPTION),
1803 : errmsg("%s", UTF_U2E(Tcl_GetString(objv[2])))));
1804 GIC 258 : UTF_END;
1805 : }
1806 UIC 0 : PG_CATCH();
1807 EUB : {
1808 : ErrorData *edata;
1809 :
1810 : /* Must reset elog.c's state */
1811 UIC 0 : MemoryContextSwitchTo(oldcontext);
1812 UBC 0 : edata = CopyErrorData();
1813 0 : FlushErrorState();
1814 EUB :
1815 : /* Pass the error data to Tcl */
1816 UBC 0 : pltcl_construct_errorCode(interp, edata);
1817 UIC 0 : UTF_BEGIN;
1818 UBC 0 : Tcl_SetObjResult(interp, Tcl_NewStringObj(UTF_E2U(edata->message), -1));
1819 UIC 0 : UTF_END;
1820 LBC 0 : FreeErrorData(edata);
1821 :
1822 0 : return TCL_ERROR;
1823 : }
1824 GIC 258 : PG_END_TRY();
1825 :
1826 258 : return TCL_OK;
1827 : }
1828 :
1829 :
1830 : /**********************************************************************
1831 ECB : * pltcl_construct_errorCode() - construct a Tcl errorCode
1832 : * list with detailed information from the PostgreSQL server
1833 : **********************************************************************/
1834 : static void
1835 CBC 18 : pltcl_construct_errorCode(Tcl_Interp *interp, ErrorData *edata)
1836 : {
1837 18 : Tcl_Obj *obj = Tcl_NewObj();
1838 :
1839 18 : Tcl_ListObjAppendElement(interp, obj,
1840 : Tcl_NewStringObj("POSTGRES", -1));
1841 18 : Tcl_ListObjAppendElement(interp, obj,
1842 ECB : Tcl_NewStringObj(PG_VERSION, -1));
1843 CBC 18 : Tcl_ListObjAppendElement(interp, obj,
1844 : Tcl_NewStringObj("SQLSTATE", -1));
1845 18 : Tcl_ListObjAppendElement(interp, obj,
1846 GIC 18 : Tcl_NewStringObj(unpack_sql_state(edata->sqlerrcode), -1));
1847 CBC 18 : Tcl_ListObjAppendElement(interp, obj,
1848 : Tcl_NewStringObj("condition", -1));
1849 18 : Tcl_ListObjAppendElement(interp, obj,
1850 ECB : Tcl_NewStringObj(pltcl_get_condition_name(edata->sqlerrcode), -1));
1851 CBC 18 : Tcl_ListObjAppendElement(interp, obj,
1852 ECB : Tcl_NewStringObj("message", -1));
1853 CBC 18 : UTF_BEGIN;
1854 GIC 18 : Tcl_ListObjAppendElement(interp, obj,
1855 CBC 18 : Tcl_NewStringObj(UTF_E2U(edata->message), -1));
1856 GIC 18 : UTF_END;
1857 CBC 18 : if (edata->detail)
1858 ECB : {
1859 CBC 3 : Tcl_ListObjAppendElement(interp, obj,
1860 ECB : Tcl_NewStringObj("detail", -1));
1861 GIC 3 : UTF_BEGIN;
1862 CBC 3 : Tcl_ListObjAppendElement(interp, obj,
1863 GIC 3 : Tcl_NewStringObj(UTF_E2U(edata->detail), -1));
1864 CBC 3 : UTF_END;
1865 : }
1866 18 : if (edata->hint)
1867 ECB : {
1868 CBC 1 : Tcl_ListObjAppendElement(interp, obj,
1869 ECB : Tcl_NewStringObj("hint", -1));
1870 GIC 1 : UTF_BEGIN;
1871 CBC 1 : Tcl_ListObjAppendElement(interp, obj,
1872 GIC 1 : Tcl_NewStringObj(UTF_E2U(edata->hint), -1));
1873 CBC 1 : UTF_END;
1874 : }
1875 18 : if (edata->context)
1876 ECB : {
1877 CBC 9 : Tcl_ListObjAppendElement(interp, obj,
1878 ECB : Tcl_NewStringObj("context", -1));
1879 GIC 9 : UTF_BEGIN;
1880 CBC 9 : Tcl_ListObjAppendElement(interp, obj,
1881 GIC 9 : Tcl_NewStringObj(UTF_E2U(edata->context), -1));
1882 CBC 9 : UTF_END;
1883 : }
1884 18 : if (edata->schema_name)
1885 ECB : {
1886 CBC 3 : Tcl_ListObjAppendElement(interp, obj,
1887 ECB : Tcl_NewStringObj("schema", -1));
1888 GIC 3 : UTF_BEGIN;
1889 CBC 3 : Tcl_ListObjAppendElement(interp, obj,
1890 GIC 3 : Tcl_NewStringObj(UTF_E2U(edata->schema_name), -1));
1891 CBC 3 : UTF_END;
1892 : }
1893 18 : if (edata->table_name)
1894 ECB : {
1895 CBC 3 : Tcl_ListObjAppendElement(interp, obj,
1896 ECB : Tcl_NewStringObj("table", -1));
1897 GIC 3 : UTF_BEGIN;
1898 CBC 3 : Tcl_ListObjAppendElement(interp, obj,
1899 GIC 3 : Tcl_NewStringObj(UTF_E2U(edata->table_name), -1));
1900 CBC 3 : UTF_END;
1901 : }
1902 18 : if (edata->column_name)
1903 ECB : {
1904 CBC 1 : Tcl_ListObjAppendElement(interp, obj,
1905 ECB : Tcl_NewStringObj("column", -1));
1906 GIC 1 : UTF_BEGIN;
1907 CBC 1 : Tcl_ListObjAppendElement(interp, obj,
1908 GIC 1 : Tcl_NewStringObj(UTF_E2U(edata->column_name), -1));
1909 CBC 1 : UTF_END;
1910 : }
1911 18 : if (edata->datatype_name)
1912 ECB : {
1913 CBC 1 : Tcl_ListObjAppendElement(interp, obj,
1914 ECB : Tcl_NewStringObj("datatype", -1));
1915 GIC 1 : UTF_BEGIN;
1916 CBC 1 : Tcl_ListObjAppendElement(interp, obj,
1917 GIC 1 : Tcl_NewStringObj(UTF_E2U(edata->datatype_name), -1));
1918 CBC 1 : UTF_END;
1919 : }
1920 18 : if (edata->constraint_name)
1921 ECB : {
1922 CBC 3 : Tcl_ListObjAppendElement(interp, obj,
1923 ECB : Tcl_NewStringObj("constraint", -1));
1924 GIC 3 : UTF_BEGIN;
1925 3 : Tcl_ListObjAppendElement(interp, obj,
1926 CBC 3 : Tcl_NewStringObj(UTF_E2U(edata->constraint_name), -1));
1927 GIC 3 : UTF_END;
1928 ECB : }
1929 : /* cursorpos is never interesting here; report internal query/pos */
1930 CBC 18 : if (edata->internalquery)
1931 ECB : {
1932 CBC 4 : Tcl_ListObjAppendElement(interp, obj,
1933 ECB : Tcl_NewStringObj("statement", -1));
1934 GIC 4 : UTF_BEGIN;
1935 CBC 4 : Tcl_ListObjAppendElement(interp, obj,
1936 GIC 4 : Tcl_NewStringObj(UTF_E2U(edata->internalquery), -1));
1937 CBC 4 : UTF_END;
1938 : }
1939 18 : if (edata->internalpos > 0)
1940 : {
1941 GIC 4 : Tcl_ListObjAppendElement(interp, obj,
1942 ECB : Tcl_NewStringObj("cursor_position", -1));
1943 GIC 4 : Tcl_ListObjAppendElement(interp, obj,
1944 ECB : Tcl_NewIntObj(edata->internalpos));
1945 : }
1946 CBC 18 : if (edata->filename)
1947 ECB : {
1948 CBC 18 : Tcl_ListObjAppendElement(interp, obj,
1949 ECB : Tcl_NewStringObj("filename", -1));
1950 GIC 18 : UTF_BEGIN;
1951 CBC 18 : Tcl_ListObjAppendElement(interp, obj,
1952 GIC 18 : Tcl_NewStringObj(UTF_E2U(edata->filename), -1));
1953 CBC 18 : UTF_END;
1954 : }
1955 18 : if (edata->lineno > 0)
1956 : {
1957 GIC 18 : Tcl_ListObjAppendElement(interp, obj,
1958 ECB : Tcl_NewStringObj("lineno", -1));
1959 GIC 18 : Tcl_ListObjAppendElement(interp, obj,
1960 ECB : Tcl_NewIntObj(edata->lineno));
1961 : }
1962 CBC 18 : if (edata->funcname)
1963 ECB : {
1964 CBC 18 : Tcl_ListObjAppendElement(interp, obj,
1965 ECB : Tcl_NewStringObj("funcname", -1));
1966 GIC 18 : UTF_BEGIN;
1967 18 : Tcl_ListObjAppendElement(interp, obj,
1968 CBC 18 : Tcl_NewStringObj(UTF_E2U(edata->funcname), -1));
1969 18 : UTF_END;
1970 : }
1971 :
1972 GIC 18 : Tcl_SetObjErrorCode(interp, obj);
1973 18 : }
1974 :
1975 :
1976 ECB : /**********************************************************************
1977 : * pltcl_get_condition_name() - find name for SQLSTATE
1978 : **********************************************************************/
1979 : static const char *
1980 CBC 18 : pltcl_get_condition_name(int sqlstate)
1981 : {
1982 ECB : int i;
1983 :
1984 GIC 2247 : for (i = 0; exception_name_map[i].label != NULL; i++)
1985 EUB : {
1986 GIC 2247 : if (exception_name_map[i].sqlerrstate == sqlstate)
1987 18 : return exception_name_map[i].label;
1988 : }
1989 UIC 0 : return "unrecognized_sqlstate";
1990 : }
1991 :
1992 :
1993 : /**********************************************************************
1994 ECB : * pltcl_quote() - quote literal strings that are to
1995 : * be used in SPI_execute query strings
1996 : **********************************************************************/
1997 : static int
1998 GIC 11 : pltcl_quote(ClientData cdata, Tcl_Interp *interp,
1999 : int objc, Tcl_Obj *const objv[])
2000 : {
2001 : char *tmp;
2002 : const char *cp1;
2003 : char *cp2;
2004 : int length;
2005 ECB :
2006 : /************************************************************
2007 : * Check call syntax
2008 : ************************************************************/
2009 GIC 11 : if (objc != 2)
2010 : {
2011 1 : Tcl_WrongNumArgs(interp, 1, objv, "string");
2012 1 : return TCL_ERROR;
2013 : }
2014 :
2015 ECB : /************************************************************
2016 : * Allocate space for the maximum the string can
2017 : * grow to and initialize pointers
2018 : ************************************************************/
2019 GIC 10 : cp1 = Tcl_GetStringFromObj(objv[1], &length);
2020 10 : tmp = palloc(length * 2 + 1);
2021 10 : cp2 = tmp;
2022 ECB :
2023 : /************************************************************
2024 : * Walk through string and double every quote and backslash
2025 : ************************************************************/
2026 GIC 56 : while (*cp1)
2027 : {
2028 CBC 46 : if (*cp1 == '\'')
2029 1 : *cp2++ = '\'';
2030 : else
2031 ECB : {
2032 GIC 45 : if (*cp1 == '\\')
2033 1 : *cp2++ = '\\';
2034 : }
2035 46 : *cp2++ = *cp1++;
2036 : }
2037 ECB :
2038 : /************************************************************
2039 : * Terminate the string and set it as result
2040 : ************************************************************/
2041 GIC 10 : *cp2 = '\0';
2042 10 : Tcl_SetObjResult(interp, Tcl_NewStringObj(tmp, -1));
2043 10 : pfree(tmp);
2044 10 : return TCL_OK;
2045 : }
2046 :
2047 :
2048 ECB : /**********************************************************************
2049 : * pltcl_argisnull() - determine if a specific argument is NULL
2050 : **********************************************************************/
2051 : static int
2052 CBC 7 : pltcl_argisnull(ClientData cdata, Tcl_Interp *interp,
2053 : int objc, Tcl_Obj *const objv[])
2054 : {
2055 : int argno;
2056 GIC 7 : FunctionCallInfo fcinfo = pltcl_current_call_state->fcinfo;
2057 ECB :
2058 : /************************************************************
2059 : * Check call syntax
2060 : ************************************************************/
2061 GIC 7 : if (objc != 2)
2062 : {
2063 1 : Tcl_WrongNumArgs(interp, 1, objv, "argno");
2064 1 : return TCL_ERROR;
2065 : }
2066 ECB :
2067 : /************************************************************
2068 : * Check that we're called as a normal function
2069 : ************************************************************/
2070 CBC 6 : if (fcinfo == NULL)
2071 : {
2072 GIC 1 : Tcl_SetObjResult(interp,
2073 : Tcl_NewStringObj("argisnull cannot be used in triggers", -1));
2074 1 : return TCL_ERROR;
2075 : }
2076 ECB :
2077 : /************************************************************
2078 : * Get the argument number
2079 : ************************************************************/
2080 GIC 5 : if (Tcl_GetIntFromObj(interp, objv[1], &argno) != TCL_OK)
2081 1 : return TCL_ERROR;
2082 ECB :
2083 : /************************************************************
2084 : * Check that the argno is valid
2085 : ************************************************************/
2086 GIC 4 : argno--;
2087 CBC 4 : if (argno < 0 || argno >= fcinfo->nargs)
2088 : {
2089 GIC 1 : Tcl_SetObjResult(interp,
2090 : Tcl_NewStringObj("argno out of range", -1));
2091 1 : return TCL_ERROR;
2092 : }
2093 ECB :
2094 : /************************************************************
2095 : * Get the requested NULL state
2096 : ************************************************************/
2097 GIC 3 : Tcl_SetObjResult(interp, Tcl_NewBooleanObj(PG_ARGISNULL(argno)));
2098 3 : return TCL_OK;
2099 : }
2100 :
2101 :
2102 ECB : /**********************************************************************
2103 : * pltcl_returnnull() - Cause a NULL return from the current function
2104 : **********************************************************************/
2105 : static int
2106 GIC 3 : pltcl_returnnull(ClientData cdata, Tcl_Interp *interp,
2107 : int objc, Tcl_Obj *const objv[])
2108 : {
2109 3 : FunctionCallInfo fcinfo = pltcl_current_call_state->fcinfo;
2110 ECB :
2111 : /************************************************************
2112 : * Check call syntax
2113 : ************************************************************/
2114 GIC 3 : if (objc != 1)
2115 : {
2116 1 : Tcl_WrongNumArgs(interp, 1, objv, "");
2117 1 : return TCL_ERROR;
2118 : }
2119 ECB :
2120 : /************************************************************
2121 : * Check that we're called as a normal function
2122 : ************************************************************/
2123 CBC 2 : if (fcinfo == NULL)
2124 : {
2125 GIC 1 : Tcl_SetObjResult(interp,
2126 : Tcl_NewStringObj("return_null cannot be used in triggers", -1));
2127 1 : return TCL_ERROR;
2128 : }
2129 :
2130 ECB : /************************************************************
2131 : * Set the NULL return flag and cause Tcl to return from the
2132 : * procedure.
2133 : ************************************************************/
2134 GIC 1 : fcinfo->isnull = true;
2135 :
2136 1 : return TCL_RETURN;
2137 : }
2138 :
2139 :
2140 ECB : /**********************************************************************
2141 : * pltcl_returnnext() - Add a row to the result tuplestore in a SRF.
2142 : **********************************************************************/
2143 : static int
2144 CBC 18 : pltcl_returnnext(ClientData cdata, Tcl_Interp *interp,
2145 ECB : int objc, Tcl_Obj *const objv[])
2146 : {
2147 CBC 18 : pltcl_call_state *call_state = pltcl_current_call_state;
2148 18 : FunctionCallInfo fcinfo = call_state->fcinfo;
2149 GIC 18 : pltcl_proc_desc *prodesc = call_state->prodesc;
2150 18 : MemoryContext oldcontext = CurrentMemoryContext;
2151 18 : ResourceOwner oldowner = CurrentResourceOwner;
2152 18 : volatile int result = TCL_OK;
2153 ECB :
2154 : /*
2155 EUB : * Check that we're called as a set-returning function
2156 : */
2157 GBC 18 : if (fcinfo == NULL)
2158 : {
2159 UIC 0 : Tcl_SetObjResult(interp,
2160 ECB : Tcl_NewStringObj("return_next cannot be used in triggers", -1));
2161 UIC 0 : return TCL_ERROR;
2162 ECB : }
2163 :
2164 CBC 18 : if (!prodesc->fn_retisset)
2165 : {
2166 GIC 1 : Tcl_SetObjResult(interp,
2167 : Tcl_NewStringObj("return_next cannot be used in non-set-returning functions", -1));
2168 1 : return TCL_ERROR;
2169 : }
2170 ECB :
2171 : /*
2172 EUB : * Check call syntax
2173 : */
2174 GIC 17 : if (objc != 2)
2175 : {
2176 UIC 0 : Tcl_WrongNumArgs(interp, 1, objv, "result");
2177 0 : return TCL_ERROR;
2178 : }
2179 :
2180 : /*
2181 : * The rest might throw elog(ERROR), so must run in a subtransaction.
2182 : *
2183 : * A small advantage of using a subtransaction is that it provides a
2184 ECB : * short-lived memory context for free, so we needn't worry about leaking
2185 : * memory here. To use that context, call BeginInternalSubTransaction
2186 : * directly instead of going through pltcl_subtrans_begin.
2187 : */
2188 CBC 17 : BeginInternalSubTransaction(NULL);
2189 17 : PG_TRY();
2190 : {
2191 ECB : /* Set up tuple store if first output row */
2192 GIC 17 : if (call_state->tuple_store == NULL)
2193 5 : pltcl_init_tuple_store(call_state);
2194 :
2195 17 : if (prodesc->fn_retistuple)
2196 : {
2197 ECB : Tcl_Obj **rowObjv;
2198 EUB : int rowObjc;
2199 :
2200 : /* result should be a list, so break it down */
2201 GIC 7 : if (Tcl_ListObjGetElements(interp, objv[1], &rowObjc, &rowObjv) == TCL_ERROR)
2202 UIC 0 : result = TCL_ERROR;
2203 ECB : else
2204 : {
2205 : HeapTuple tuple;
2206 :
2207 GIC 7 : tuple = pltcl_build_tuple_result(interp, rowObjv, rowObjc,
2208 : call_state);
2209 5 : tuplestore_puttuple(call_state->tuple_store, tuple);
2210 : }
2211 ECB : }
2212 : else
2213 : {
2214 : Datum retval;
2215 GBC 10 : bool isNull = false;
2216 :
2217 ECB : /* for paranoia's sake, check that tupdesc has exactly one column */
2218 CBC 10 : if (call_state->ret_tupdesc->natts != 1)
2219 UIC 0 : elog(ERROR, "wrong result type supplied in return_next");
2220 :
2221 CBC 10 : retval = InputFunctionCall(&prodesc->result_in_func,
2222 GIC 10 : utf_u2e((char *) Tcl_GetString(objv[1])),
2223 : prodesc->result_typioparam,
2224 : -1);
2225 CBC 10 : tuplestore_putvalues(call_state->tuple_store, call_state->ret_tupdesc,
2226 : &retval, &isNull);
2227 ECB : }
2228 :
2229 CBC 15 : pltcl_subtrans_commit(oldcontext, oldowner);
2230 ECB : }
2231 GIC 2 : PG_CATCH();
2232 ECB : {
2233 GIC 2 : pltcl_subtrans_abort(interp, oldcontext, oldowner);
2234 CBC 2 : return TCL_ERROR;
2235 : }
2236 GIC 15 : PG_END_TRY();
2237 :
2238 15 : return result;
2239 : }
2240 :
2241 :
2242 : /*----------
2243 : * Support for running SPI operations inside subtransactions
2244 : *
2245 : * Intended usage pattern is:
2246 : *
2247 : * MemoryContext oldcontext = CurrentMemoryContext;
2248 : * ResourceOwner oldowner = CurrentResourceOwner;
2249 : *
2250 : * ...
2251 : * pltcl_subtrans_begin(oldcontext, oldowner);
2252 : * PG_TRY();
2253 : * {
2254 : * do something risky;
2255 : * pltcl_subtrans_commit(oldcontext, oldowner);
2256 : * }
2257 : * PG_CATCH();
2258 : * {
2259 : * pltcl_subtrans_abort(interp, oldcontext, oldowner);
2260 : * return TCL_ERROR;
2261 : * }
2262 : * PG_END_TRY();
2263 ECB : * return TCL_OK;
2264 : *----------
2265 : */
2266 : static void
2267 GIC 122 : pltcl_subtrans_begin(MemoryContext oldcontext, ResourceOwner oldowner)
2268 ECB : {
2269 CBC 122 : BeginInternalSubTransaction(NULL);
2270 :
2271 : /* Want to run inside function's memory context */
2272 122 : MemoryContextSwitchTo(oldcontext);
2273 GIC 122 : }
2274 :
2275 ECB : static void
2276 CBC 127 : pltcl_subtrans_commit(MemoryContext oldcontext, ResourceOwner oldowner)
2277 ECB : {
2278 : /* Commit the inner transaction, return to outer xact context */
2279 GIC 127 : ReleaseCurrentSubTransaction();
2280 127 : MemoryContextSwitchTo(oldcontext);
2281 CBC 127 : CurrentResourceOwner = oldowner;
2282 GIC 127 : }
2283 :
2284 : static void
2285 12 : pltcl_subtrans_abort(Tcl_Interp *interp,
2286 : MemoryContext oldcontext, ResourceOwner oldowner)
2287 ECB : {
2288 : ErrorData *edata;
2289 :
2290 : /* Save error info */
2291 GIC 12 : MemoryContextSwitchTo(oldcontext);
2292 CBC 12 : edata = CopyErrorData();
2293 12 : FlushErrorState();
2294 ECB :
2295 : /* Abort the inner transaction */
2296 GIC 12 : RollbackAndReleaseCurrentSubTransaction();
2297 CBC 12 : MemoryContextSwitchTo(oldcontext);
2298 12 : CurrentResourceOwner = oldowner;
2299 ECB :
2300 : /* Pass the error data to Tcl */
2301 CBC 12 : pltcl_construct_errorCode(interp, edata);
2302 12 : UTF_BEGIN;
2303 GIC 12 : Tcl_SetObjResult(interp, Tcl_NewStringObj(UTF_E2U(edata->message), -1));
2304 12 : UTF_END;
2305 12 : FreeErrorData(edata);
2306 12 : }
2307 :
2308 :
2309 : /**********************************************************************
2310 ECB : * pltcl_SPI_execute() - The builtin SPI_execute command
2311 : * for the Tcl interpreter
2312 : **********************************************************************/
2313 : static int
2314 GIC 63 : pltcl_SPI_execute(ClientData cdata, Tcl_Interp *interp,
2315 : int objc, Tcl_Obj *const objv[])
2316 : {
2317 : int my_rc;
2318 ECB : int spi_rc;
2319 : int query_idx;
2320 : int i;
2321 : int optIndex;
2322 CBC 63 : int count = 0;
2323 GIC 63 : const char *volatile arrayname = NULL;
2324 63 : Tcl_Obj *volatile loop_body = NULL;
2325 63 : MemoryContext oldcontext = CurrentMemoryContext;
2326 63 : ResourceOwner oldowner = CurrentResourceOwner;
2327 :
2328 : enum options
2329 : {
2330 : OPT_ARRAY, OPT_COUNT
2331 : };
2332 :
2333 : static const char *options[] = {
2334 : "-array", "-count", (const char *) NULL
2335 : };
2336 ECB :
2337 : /************************************************************
2338 : * Check the call syntax and get the options
2339 : ************************************************************/
2340 CBC 63 : if (objc < 2)
2341 : {
2342 GIC 1 : Tcl_WrongNumArgs(interp, 1, objv,
2343 ECB : "?-count n? ?-array name? query ?loop body?");
2344 CBC 1 : return TCL_ERROR;
2345 : }
2346 ECB :
2347 GIC 62 : i = 1;
2348 CBC 132 : while (i < objc)
2349 : {
2350 70 : if (Tcl_GetIndexFromObj(NULL, objv[i], options, NULL,
2351 : TCL_EXACT, &optIndex) != TCL_OK)
2352 59 : break;
2353 :
2354 11 : if (++i >= objc)
2355 : {
2356 GIC 2 : Tcl_SetObjResult(interp,
2357 ECB : Tcl_NewStringObj("missing argument to -count or -array", -1));
2358 GIC 2 : return TCL_ERROR;
2359 ECB : }
2360 :
2361 CBC 9 : switch ((enum options) optIndex)
2362 : {
2363 8 : case OPT_ARRAY:
2364 8 : arrayname = Tcl_GetString(objv[i++]);
2365 8 : break;
2366 EUB :
2367 GIC 1 : case OPT_COUNT:
2368 1 : if (Tcl_GetIntFromObj(interp, objv[i++], &count) != TCL_OK)
2369 1 : return TCL_ERROR;
2370 LBC 0 : break;
2371 ECB : }
2372 : }
2373 :
2374 CBC 59 : query_idx = i;
2375 GIC 59 : if (query_idx >= objc || query_idx + 2 < objc)
2376 : {
2377 CBC 1 : Tcl_WrongNumArgs(interp, query_idx - 1, objv, "query ?loop body?");
2378 1 : return TCL_ERROR;
2379 : }
2380 :
2381 GIC 58 : if (query_idx + 1 < objc)
2382 8 : loop_body = objv[query_idx + 1];
2383 :
2384 : /************************************************************
2385 ECB : * Execute the query inside a sub-transaction, so we can cope with
2386 : * errors sanely
2387 : ************************************************************/
2388 :
2389 CBC 58 : pltcl_subtrans_begin(oldcontext, oldowner);
2390 ECB :
2391 CBC 58 : PG_TRY();
2392 ECB : {
2393 GIC 58 : UTF_BEGIN;
2394 CBC 58 : spi_rc = SPI_execute(UTF_U2E(Tcl_GetString(objv[query_idx])),
2395 GIC 58 : pltcl_current_call_state->prodesc->fn_readonly, count);
2396 50 : UTF_END;
2397 :
2398 50 : my_rc = pltcl_process_SPI_result(interp,
2399 : arrayname,
2400 : loop_body,
2401 ECB : spi_rc,
2402 : SPI_tuptable,
2403 : SPI_processed);
2404 :
2405 CBC 50 : pltcl_subtrans_commit(oldcontext, oldowner);
2406 ECB : }
2407 GIC 8 : PG_CATCH();
2408 ECB : {
2409 GIC 8 : pltcl_subtrans_abort(interp, oldcontext, oldowner);
2410 CBC 8 : return TCL_ERROR;
2411 : }
2412 GIC 50 : PG_END_TRY();
2413 :
2414 50 : return my_rc;
2415 : }
2416 :
2417 : /*
2418 : * Process the result from SPI_execute or SPI_execute_plan
2419 ECB : *
2420 : * Shared code between pltcl_SPI_execute and pltcl_SPI_execute_plan
2421 : */
2422 : static int
2423 GIC 99 : pltcl_process_SPI_result(Tcl_Interp *interp,
2424 : const char *arrayname,
2425 : Tcl_Obj *loop_body,
2426 ECB : int spi_rc,
2427 : SPITupleTable *tuptable,
2428 : uint64 ntuples)
2429 : {
2430 GIC 99 : int my_rc = TCL_OK;
2431 ECB : int loop_rc;
2432 : HeapTuple *tuples;
2433 : TupleDesc tupdesc;
2434 :
2435 GIC 99 : switch (spi_rc)
2436 : {
2437 37 : case SPI_OK_SELINTO:
2438 ECB : case SPI_OK_INSERT:
2439 : case SPI_OK_DELETE:
2440 : case SPI_OK_UPDATE:
2441 EUB : case SPI_OK_MERGE:
2442 GIC 37 : Tcl_SetObjResult(interp, Tcl_NewWideIntObj(ntuples));
2443 GBC 37 : break;
2444 :
2445 UBC 0 : case SPI_OK_UTILITY:
2446 EUB : case SPI_OK_REWRITTEN:
2447 UIC 0 : if (tuptable == NULL)
2448 : {
2449 0 : Tcl_SetObjResult(interp, Tcl_NewIntObj(0));
2450 0 : break;
2451 : }
2452 : /* fall through for utility returning tuples */
2453 : /* FALLTHROUGH */
2454 :
2455 : case SPI_OK_SELECT:
2456 : case SPI_OK_INSERT_RETURNING:
2457 : case SPI_OK_DELETE_RETURNING:
2458 : case SPI_OK_UPDATE_RETURNING:
2459 ECB :
2460 : /*
2461 : * Process the tuples we got
2462 : */
2463 GIC 61 : tuples = tuptable->vals;
2464 61 : tupdesc = tuptable->tupdesc;
2465 :
2466 61 : if (loop_body == NULL)
2467 : {
2468 ECB : /*
2469 : * If there is no loop body given, just set the variables from
2470 : * the first tuple (if any)
2471 : */
2472 GIC 49 : if (ntuples > 0)
2473 28 : pltcl_set_tuple_values(interp, arrayname, 0,
2474 : tuples[0], tupdesc);
2475 : }
2476 : else
2477 : {
2478 : /*
2479 : * There is a loop body - process all tuples and evaluate the
2480 ECB : * body on each
2481 : */
2482 : uint64 i;
2483 :
2484 GIC 26 : for (i = 0; i < ntuples; i++)
2485 ECB : {
2486 GIC 22 : pltcl_set_tuple_values(interp, arrayname, i,
2487 CBC 22 : tuples[i], tupdesc);
2488 ECB :
2489 CBC 22 : loop_rc = Tcl_EvalObjEx(interp, loop_body, 0);
2490 ECB :
2491 CBC 22 : if (loop_rc == TCL_OK)
2492 GIC 12 : continue;
2493 CBC 10 : if (loop_rc == TCL_CONTINUE)
2494 2 : continue;
2495 GIC 8 : if (loop_rc == TCL_RETURN)
2496 ECB : {
2497 CBC 2 : my_rc = TCL_RETURN;
2498 2 : break;
2499 ECB : }
2500 GIC 6 : if (loop_rc == TCL_BREAK)
2501 2 : break;
2502 4 : my_rc = TCL_ERROR;
2503 CBC 4 : break;
2504 : }
2505 ECB : }
2506 :
2507 CBC 61 : if (my_rc == TCL_OK)
2508 : {
2509 55 : Tcl_SetObjResult(interp, Tcl_NewWideIntObj(ntuples));
2510 ECB : }
2511 GIC 61 : break;
2512 ECB :
2513 CBC 1 : default:
2514 GIC 1 : Tcl_AppendResult(interp, "pltcl: SPI_execute failed: ",
2515 : SPI_result_code_string(spi_rc), NULL);
2516 CBC 1 : my_rc = TCL_ERROR;
2517 GIC 1 : break;
2518 ECB : }
2519 :
2520 GIC 99 : SPI_freetuptable(tuptable);
2521 :
2522 99 : return my_rc;
2523 : }
2524 :
2525 :
2526 : /**********************************************************************
2527 : * pltcl_SPI_prepare() - Builtin support for prepared plans
2528 : * The Tcl command SPI_prepare
2529 : * always saves the plan using
2530 : * SPI_keepplan and returns a key for
2531 ECB : * access. There is no chance to prepare
2532 : * and not save the plan currently.
2533 : **********************************************************************/
2534 : static int
2535 GIC 17 : pltcl_SPI_prepare(ClientData cdata, Tcl_Interp *interp,
2536 : int objc, Tcl_Obj *const objv[])
2537 : {
2538 17 : volatile MemoryContext plan_cxt = NULL;
2539 : int nargs;
2540 : Tcl_Obj **argsObj;
2541 : pltcl_query_desc *qdesc;
2542 ECB : int i;
2543 : Tcl_HashEntry *hashent;
2544 : int hashnew;
2545 : Tcl_HashTable *query_hash;
2546 GIC 17 : MemoryContext oldcontext = CurrentMemoryContext;
2547 17 : ResourceOwner oldowner = CurrentResourceOwner;
2548 ECB :
2549 : /************************************************************
2550 : * Check the call syntax
2551 : ************************************************************/
2552 GIC 17 : if (objc != 3)
2553 : {
2554 1 : Tcl_WrongNumArgs(interp, 1, objv, "query argtypes");
2555 1 : return TCL_ERROR;
2556 : }
2557 ECB :
2558 : /************************************************************
2559 : * Split the argument type list
2560 : ************************************************************/
2561 GIC 16 : if (Tcl_ListObjGetElements(interp, objv[2], &nargs, &argsObj) != TCL_OK)
2562 1 : return TCL_ERROR;
2563 :
2564 : /************************************************************
2565 : * Allocate the new querydesc structure
2566 : *
2567 ECB : * struct qdesc and subsidiary data all live in plan_cxt. Note that if the
2568 : * function is recompiled for whatever reason, permanent memory leaks
2569 : * occur. FIXME someday.
2570 : ************************************************************/
2571 CBC 15 : plan_cxt = AllocSetContextCreate(TopMemoryContext,
2572 ECB : "PL/Tcl spi_prepare query",
2573 : ALLOCSET_SMALL_SIZES);
2574 CBC 15 : MemoryContextSwitchTo(plan_cxt);
2575 15 : qdesc = (pltcl_query_desc *) palloc0(sizeof(pltcl_query_desc));
2576 15 : snprintf(qdesc->qname, sizeof(qdesc->qname), "%p", qdesc);
2577 15 : qdesc->nargs = nargs;
2578 GIC 15 : qdesc->argtypes = (Oid *) palloc(nargs * sizeof(Oid));
2579 15 : qdesc->arginfuncs = (FmgrInfo *) palloc(nargs * sizeof(FmgrInfo));
2580 15 : qdesc->argtypioparams = (Oid *) palloc(nargs * sizeof(Oid));
2581 15 : MemoryContextSwitchTo(oldcontext);
2582 :
2583 : /************************************************************
2584 ECB : * Execute the prepare inside a sub-transaction, so we can cope with
2585 : * errors sanely
2586 : ************************************************************/
2587 :
2588 GIC 15 : pltcl_subtrans_begin(oldcontext, oldowner);
2589 :
2590 15 : PG_TRY();
2591 : {
2592 : /************************************************************
2593 ECB : * Resolve argument type names and then look them up by oid
2594 : * in the system cache, and remember the required information
2595 : * for input conversion.
2596 : ************************************************************/
2597 GIC 34 : for (i = 0; i < nargs; i++)
2598 : {
2599 : Oid typId,
2600 ECB : typInput,
2601 : typIOParam;
2602 : int32 typmod;
2603 :
2604 GNC 20 : (void) parseTypeString(Tcl_GetString(argsObj[i]),
2605 : &typId, &typmod, NULL);
2606 ECB :
2607 CBC 19 : getTypeInputInfo(typId, &typInput, &typIOParam);
2608 ECB :
2609 GIC 19 : qdesc->argtypes[i] = typId;
2610 19 : fmgr_info_cxt(typInput, &(qdesc->arginfuncs[i]), plan_cxt);
2611 19 : qdesc->argtypioparams[i] = typIOParam;
2612 : }
2613 :
2614 ECB : /************************************************************
2615 : * Prepare the plan and check for errors
2616 : ************************************************************/
2617 CBC 14 : UTF_BEGIN;
2618 GIC 14 : qdesc->plan = SPI_prepare(UTF_U2E(Tcl_GetString(objv[1])),
2619 ECB : nargs, qdesc->argtypes);
2620 GBC 13 : UTF_END;
2621 :
2622 GIC 13 : if (qdesc->plan == NULL)
2623 UIC 0 : elog(ERROR, "SPI_prepare() failed");
2624 :
2625 : /************************************************************
2626 ECB : * Save the plan into permanent memory (right now it's in the
2627 EUB : * SPI procCxt, which will go away at function end).
2628 : ************************************************************/
2629 CBC 13 : if (SPI_keepplan(qdesc->plan))
2630 UIC 0 : elog(ERROR, "SPI_keepplan() failed");
2631 ECB :
2632 GIC 13 : pltcl_subtrans_commit(oldcontext, oldowner);
2633 ECB : }
2634 GIC 2 : PG_CATCH();
2635 ECB : {
2636 GIC 2 : pltcl_subtrans_abort(interp, oldcontext, oldowner);
2637 ECB :
2638 GIC 2 : MemoryContextDelete(plan_cxt);
2639 ECB :
2640 GIC 2 : return TCL_ERROR;
2641 : }
2642 13 : PG_END_TRY();
2643 :
2644 : /************************************************************
2645 ECB : * Insert a hashtable entry for the plan and return
2646 : * the key to the caller
2647 : ************************************************************/
2648 CBC 13 : query_hash = &pltcl_current_call_state->prodesc->interp_desc->query_hash;
2649 :
2650 GIC 13 : hashent = Tcl_CreateHashEntry(query_hash, qdesc->qname, &hashnew);
2651 CBC 13 : Tcl_SetHashValue(hashent, (ClientData) qdesc);
2652 ECB :
2653 : /* qname is ASCII, so no need for encoding conversion */
2654 GIC 13 : Tcl_SetObjResult(interp, Tcl_NewStringObj(qdesc->qname, -1));
2655 13 : return TCL_OK;
2656 : }
2657 :
2658 :
2659 : /**********************************************************************
2660 ECB : * pltcl_SPI_execute_plan() - Execute a prepared plan
2661 : **********************************************************************/
2662 : static int
2663 GIC 55 : pltcl_SPI_execute_plan(ClientData cdata, Tcl_Interp *interp,
2664 : int objc, Tcl_Obj *const objv[])
2665 : {
2666 : int my_rc;
2667 : int spi_rc;
2668 : int i;
2669 : int j;
2670 ECB : int optIndex;
2671 : Tcl_HashEntry *hashent;
2672 : pltcl_query_desc *qdesc;
2673 CBC 55 : const char *nulls = NULL;
2674 GIC 55 : const char *arrayname = NULL;
2675 CBC 55 : Tcl_Obj *loop_body = NULL;
2676 GIC 55 : int count = 0;
2677 ECB : int callObjc;
2678 CBC 55 : Tcl_Obj **callObjv = NULL;
2679 : Datum *argvalues;
2680 GIC 55 : MemoryContext oldcontext = CurrentMemoryContext;
2681 55 : ResourceOwner oldowner = CurrentResourceOwner;
2682 : Tcl_HashTable *query_hash;
2683 :
2684 : enum options
2685 : {
2686 : OPT_ARRAY, OPT_COUNT, OPT_NULLS
2687 : };
2688 :
2689 : static const char *options[] = {
2690 : "-array", "-count", "-nulls", (const char *) NULL
2691 : };
2692 :
2693 ECB : /************************************************************
2694 : * Get the options and check syntax
2695 : ************************************************************/
2696 CBC 55 : i = 1;
2697 GIC 154 : while (i < objc)
2698 ECB : {
2699 GIC 98 : if (Tcl_GetIndexFromObj(NULL, objv[i], options, NULL,
2700 ECB : TCL_EXACT, &optIndex) != TCL_OK)
2701 GIC 50 : break;
2702 ECB :
2703 GIC 48 : if (++i >= objc)
2704 ECB : {
2705 GIC 3 : Tcl_SetObjResult(interp,
2706 : Tcl_NewStringObj("missing argument to -array, -count or -nulls", -1));
2707 CBC 3 : return TCL_ERROR;
2708 : }
2709 ECB :
2710 CBC 45 : switch ((enum options) optIndex)
2711 ECB : {
2712 GIC 4 : case OPT_ARRAY:
2713 CBC 4 : arrayname = Tcl_GetString(objv[i++]);
2714 4 : break;
2715 ECB :
2716 CBC 41 : case OPT_COUNT:
2717 GIC 41 : if (Tcl_GetIntFromObj(interp, objv[i++], &count) != TCL_OK)
2718 GBC 1 : return TCL_ERROR;
2719 40 : break;
2720 EUB :
2721 UIC 0 : case OPT_NULLS:
2722 0 : nulls = Tcl_GetString(objv[i++]);
2723 0 : break;
2724 : }
2725 : }
2726 :
2727 ECB : /************************************************************
2728 : * Get the prepared plan descriptor by its key
2729 : ************************************************************/
2730 GIC 51 : if (i >= objc)
2731 ECB : {
2732 GIC 1 : Tcl_SetObjResult(interp,
2733 : Tcl_NewStringObj("missing argument to -count or -array", -1));
2734 CBC 1 : return TCL_ERROR;
2735 : }
2736 ECB :
2737 CBC 50 : query_hash = &pltcl_current_call_state->prodesc->interp_desc->query_hash;
2738 :
2739 50 : hashent = Tcl_FindHashEntry(query_hash, Tcl_GetString(objv[i]));
2740 50 : if (hashent == NULL)
2741 : {
2742 1 : Tcl_AppendResult(interp, "invalid queryid '", Tcl_GetString(objv[i]), "'", NULL);
2743 1 : return TCL_ERROR;
2744 : }
2745 GIC 49 : qdesc = (pltcl_query_desc *) Tcl_GetHashValue(hashent);
2746 49 : i++;
2747 :
2748 ECB : /************************************************************
2749 : * If a nulls string is given, check for correct length
2750 EUB : ************************************************************/
2751 GIC 49 : if (nulls != NULL)
2752 EUB : {
2753 UIC 0 : if (strlen(nulls) != qdesc->nargs)
2754 : {
2755 UBC 0 : Tcl_SetObjResult(interp,
2756 : Tcl_NewStringObj("length of nulls string doesn't match number of arguments",
2757 : -1));
2758 UIC 0 : return TCL_ERROR;
2759 : }
2760 : }
2761 :
2762 : /************************************************************
2763 ECB : * If there was an argtype list on preparation, we need
2764 : * an argument value list now
2765 : ************************************************************/
2766 GIC 49 : if (qdesc->nargs > 0)
2767 EUB : {
2768 GIC 45 : if (i >= objc)
2769 : {
2770 UBC 0 : Tcl_SetObjResult(interp,
2771 : Tcl_NewStringObj("argument list length doesn't match number of arguments for query",
2772 : -1));
2773 UIC 0 : return TCL_ERROR;
2774 : }
2775 :
2776 ECB : /************************************************************
2777 EUB : * Split the argument values
2778 : ************************************************************/
2779 GIC 45 : if (Tcl_ListObjGetElements(interp, objv[i++], &callObjc, &callObjv) != TCL_OK)
2780 UIC 0 : return TCL_ERROR;
2781 :
2782 ECB : /************************************************************
2783 : * Check that the number of arguments matches
2784 EUB : ************************************************************/
2785 GIC 45 : if (callObjc != qdesc->nargs)
2786 : {
2787 UBC 0 : Tcl_SetObjResult(interp,
2788 : Tcl_NewStringObj("argument list length doesn't match number of arguments for query",
2789 : -1));
2790 UIC 0 : return TCL_ERROR;
2791 ECB : }
2792 : }
2793 : else
2794 GIC 4 : callObjc = 0;
2795 :
2796 ECB : /************************************************************
2797 : * Get loop body if present
2798 : ************************************************************/
2799 CBC 49 : if (i < objc)
2800 GIC 4 : loop_body = objv[i++];
2801 EUB :
2802 GIC 49 : if (i != objc)
2803 : {
2804 UBC 0 : Tcl_WrongNumArgs(interp, 1, objv,
2805 : "?-count n? ?-array name? ?-nulls string? "
2806 : "query ?args? ?loop body?");
2807 UIC 0 : return TCL_ERROR;
2808 : }
2809 :
2810 : /************************************************************
2811 : * Execute the plan inside a sub-transaction, so we can cope with
2812 ECB : * errors sanely
2813 : ************************************************************/
2814 :
2815 GIC 49 : pltcl_subtrans_begin(oldcontext, oldowner);
2816 :
2817 49 : PG_TRY();
2818 : {
2819 : /************************************************************
2820 ECB : * Setup the value array for SPI_execute_plan() using
2821 : * the type specific input functions
2822 : ************************************************************/
2823 GIC 49 : argvalues = (Datum *) palloc(callObjc * sizeof(Datum));
2824 ECB :
2825 GIC 142 : for (j = 0; j < callObjc; j++)
2826 EUB : {
2827 GIC 93 : if (nulls && nulls[j] == 'n')
2828 EUB : {
2829 UIC 0 : argvalues[j] = InputFunctionCall(&qdesc->arginfuncs[j],
2830 : NULL,
2831 0 : qdesc->argtypioparams[j],
2832 : -1);
2833 ECB : }
2834 : else
2835 : {
2836 CBC 93 : UTF_BEGIN;
2837 GIC 279 : argvalues[j] = InputFunctionCall(&qdesc->arginfuncs[j],
2838 CBC 93 : UTF_U2E(Tcl_GetString(callObjv[j])),
2839 GIC 93 : qdesc->argtypioparams[j],
2840 : -1);
2841 93 : UTF_END;
2842 : }
2843 : }
2844 :
2845 ECB : /************************************************************
2846 : * Execute the plan
2847 : ************************************************************/
2848 GIC 98 : spi_rc = SPI_execute_plan(qdesc->plan, argvalues, nulls,
2849 CBC 49 : pltcl_current_call_state->prodesc->fn_readonly,
2850 : count);
2851 :
2852 GIC 49 : my_rc = pltcl_process_SPI_result(interp,
2853 : arrayname,
2854 : loop_body,
2855 : spi_rc,
2856 ECB : SPI_tuptable,
2857 : SPI_processed);
2858 EUB :
2859 GIC 49 : pltcl_subtrans_commit(oldcontext, oldowner);
2860 EUB : }
2861 UBC 0 : PG_CATCH();
2862 : {
2863 LBC 0 : pltcl_subtrans_abort(interp, oldcontext, oldowner);
2864 UIC 0 : return TCL_ERROR;
2865 ECB : }
2866 GIC 49 : PG_END_TRY();
2867 :
2868 49 : return my_rc;
2869 : }
2870 :
2871 :
2872 : /**********************************************************************
2873 : * pltcl_subtransaction() - Execute some Tcl code in a subtransaction
2874 : *
2875 : * The subtransaction is aborted if the Tcl code fragment returns TCL_ERROR,
2876 ECB : * otherwise it's subcommitted.
2877 : **********************************************************************/
2878 : static int
2879 CBC 8 : pltcl_subtransaction(ClientData cdata, Tcl_Interp *interp,
2880 ECB : int objc, Tcl_Obj *const objv[])
2881 : {
2882 GIC 8 : MemoryContext oldcontext = CurrentMemoryContext;
2883 CBC 8 : ResourceOwner oldowner = CurrentResourceOwner;
2884 : int retcode;
2885 EUB :
2886 GBC 8 : if (objc != 2)
2887 : {
2888 UIC 0 : Tcl_WrongNumArgs(interp, 1, objv, "command");
2889 0 : return TCL_ERROR;
2890 : }
2891 :
2892 : /*
2893 : * Note: we don't use pltcl_subtrans_begin and friends here because we
2894 ECB : * don't want the error handling in pltcl_subtrans_abort. But otherwise
2895 : * the processing should be about the same as in those functions.
2896 : */
2897 CBC 8 : BeginInternalSubTransaction(NULL);
2898 GIC 8 : MemoryContextSwitchTo(oldcontext);
2899 ECB :
2900 GIC 8 : retcode = Tcl_EvalObjEx(interp, objv[1], 0);
2901 :
2902 CBC 8 : if (retcode == TCL_ERROR)
2903 : {
2904 : /* Rollback the subtransaction */
2905 GIC 5 : RollbackAndReleaseCurrentSubTransaction();
2906 : }
2907 ECB : else
2908 : {
2909 : /* Commit the subtransaction */
2910 GIC 3 : ReleaseCurrentSubTransaction();
2911 ECB : }
2912 :
2913 : /* In either case, restore previous memory context and resource owner */
2914 CBC 8 : MemoryContextSwitchTo(oldcontext);
2915 GIC 8 : CurrentResourceOwner = oldowner;
2916 :
2917 8 : return retcode;
2918 : }
2919 :
2920 :
2921 : /**********************************************************************
2922 : * pltcl_commit()
2923 : *
2924 ECB : * Commit the transaction and start a new one.
2925 : **********************************************************************/
2926 : static int
2927 CBC 10 : pltcl_commit(ClientData cdata, Tcl_Interp *interp,
2928 : int objc, Tcl_Obj *const objv[])
2929 ECB : {
2930 GIC 10 : MemoryContext oldcontext = CurrentMemoryContext;
2931 ECB :
2932 GIC 10 : PG_TRY();
2933 ECB : {
2934 GIC 10 : SPI_commit();
2935 : }
2936 5 : PG_CATCH();
2937 : {
2938 ECB : ErrorData *edata;
2939 :
2940 : /* Save error info */
2941 GIC 5 : MemoryContextSwitchTo(oldcontext);
2942 5 : edata = CopyErrorData();
2943 CBC 5 : FlushErrorState();
2944 ECB :
2945 : /* Pass the error data to Tcl */
2946 CBC 5 : pltcl_construct_errorCode(interp, edata);
2947 5 : UTF_BEGIN;
2948 GIC 5 : Tcl_SetObjResult(interp, Tcl_NewStringObj(UTF_E2U(edata->message), -1));
2949 CBC 5 : UTF_END;
2950 GIC 5 : FreeErrorData(edata);
2951 ECB :
2952 GIC 5 : return TCL_ERROR;
2953 ECB : }
2954 GIC 5 : PG_END_TRY();
2955 :
2956 5 : return TCL_OK;
2957 : }
2958 :
2959 :
2960 : /**********************************************************************
2961 : * pltcl_rollback()
2962 : *
2963 ECB : * Abort the transaction and start a new one.
2964 : **********************************************************************/
2965 : static int
2966 CBC 6 : pltcl_rollback(ClientData cdata, Tcl_Interp *interp,
2967 : int objc, Tcl_Obj *const objv[])
2968 ECB : {
2969 GIC 6 : MemoryContext oldcontext = CurrentMemoryContext;
2970 ECB :
2971 GIC 6 : PG_TRY();
2972 ECB : {
2973 GIC 6 : SPI_rollback();
2974 : }
2975 1 : PG_CATCH();
2976 : {
2977 ECB : ErrorData *edata;
2978 :
2979 : /* Save error info */
2980 GIC 1 : MemoryContextSwitchTo(oldcontext);
2981 1 : edata = CopyErrorData();
2982 CBC 1 : FlushErrorState();
2983 ECB :
2984 : /* Pass the error data to Tcl */
2985 CBC 1 : pltcl_construct_errorCode(interp, edata);
2986 1 : UTF_BEGIN;
2987 GIC 1 : Tcl_SetObjResult(interp, Tcl_NewStringObj(UTF_E2U(edata->message), -1));
2988 CBC 1 : UTF_END;
2989 GIC 1 : FreeErrorData(edata);
2990 ECB :
2991 GIC 1 : return TCL_ERROR;
2992 ECB : }
2993 GIC 5 : PG_END_TRY();
2994 :
2995 5 : return TCL_OK;
2996 : }
2997 :
2998 :
2999 : /**********************************************************************
3000 : * pltcl_set_tuple_values() - Set variables for all attributes
3001 : * of a given tuple
3002 : *
3003 ECB : * Note: arrayname is presumed to be UTF8; it usually came from Tcl
3004 : **********************************************************************/
3005 : static void
3006 GIC 50 : pltcl_set_tuple_values(Tcl_Interp *interp, const char *arrayname,
3007 : uint64 tupno, HeapTuple tuple, TupleDesc tupdesc)
3008 : {
3009 : int i;
3010 : char *outputstr;
3011 : Datum attr;
3012 : bool isnull;
3013 : const char *attname;
3014 : Oid typoutput;
3015 ECB : bool typisvarlena;
3016 : const char **arrptr;
3017 : const char **nameptr;
3018 GIC 50 : const char *nullname = NULL;
3019 :
3020 ECB : /************************************************************
3021 : * Prepare pointers for Tcl_SetVar2Ex() below
3022 : ************************************************************/
3023 CBC 50 : if (arrayname == NULL)
3024 : {
3025 GIC 28 : arrptr = &attname;
3026 28 : nameptr = &nullname;
3027 ECB : }
3028 : else
3029 : {
3030 GIC 22 : arrptr = &arrayname;
3031 22 : nameptr = &attname;
3032 :
3033 : /*
3034 : * When outputting to an array, fill the ".tupno" element with the
3035 ECB : * current tuple number. This will be overridden below if ".tupno" is
3036 : * in use as an actual field name in the rowtype.
3037 : */
3038 CBC 22 : Tcl_SetVar2Ex(interp, arrayname, ".tupno", Tcl_NewWideIntObj(tupno), 0);
3039 : }
3040 ECB :
3041 GIC 120 : for (i = 0; i < tupdesc->natts; i++)
3042 : {
3043 CBC 70 : Form_pg_attribute att = TupleDescAttr(tupdesc, i);
3044 EUB :
3045 : /* ignore dropped attributes */
3046 GIC 70 : if (att->attisdropped)
3047 UIC 0 : continue;
3048 :
3049 ECB : /************************************************************
3050 : * Get the attribute name
3051 : ************************************************************/
3052 GIC 70 : UTF_BEGIN;
3053 70 : attname = pstrdup(UTF_E2U(NameStr(att->attname)));
3054 70 : UTF_END;
3055 :
3056 ECB : /************************************************************
3057 : * Get the attributes value
3058 : ************************************************************/
3059 GIC 70 : attr = heap_getattr(tuple, i + 1, tupdesc, &isnull);
3060 :
3061 : /************************************************************
3062 : * If there is a value, set the variable
3063 : * If not, unset it
3064 : *
3065 : * Hmmm - Null attributes will cause functions to
3066 ECB : * crash if they don't expect them - need something
3067 : * smarter here.
3068 : ************************************************************/
3069 CBC 70 : if (!isnull)
3070 ECB : {
3071 CBC 70 : getTypeOutputInfo(att->atttypid, &typoutput, &typisvarlena);
3072 70 : outputstr = OidOutputFunctionCall(typoutput, attr);
3073 70 : UTF_BEGIN;
3074 70 : Tcl_SetVar2Ex(interp, *arrptr, *nameptr,
3075 GIC 70 : Tcl_NewStringObj(UTF_E2U(outputstr), -1), 0);
3076 70 : UTF_END;
3077 GBC 70 : pfree(outputstr);
3078 : }
3079 ECB : else
3080 UIC 0 : Tcl_UnsetVar2(interp, *arrptr, *nameptr, 0);
3081 ECB :
3082 GIC 70 : pfree(unconstify(char *, attname));
3083 : }
3084 50 : }
3085 :
3086 :
3087 : /**********************************************************************
3088 : * pltcl_build_tuple_argument() - Build a list object usable for 'array set'
3089 ECB : * from all attributes of a given tuple
3090 : **********************************************************************/
3091 : static Tcl_Obj *
3092 GIC 69 : pltcl_build_tuple_argument(HeapTuple tuple, TupleDesc tupdesc, bool include_generated)
3093 : {
3094 69 : Tcl_Obj *retobj = Tcl_NewObj();
3095 : int i;
3096 : char *outputstr;
3097 : Datum attr;
3098 : bool isnull;
3099 : char *attname;
3100 ECB : Oid typoutput;
3101 : bool typisvarlena;
3102 :
3103 GIC 284 : for (i = 0; i < tupdesc->natts; i++)
3104 : {
3105 CBC 215 : Form_pg_attribute att = TupleDescAttr(tupdesc, i);
3106 ECB :
3107 : /* ignore dropped attributes */
3108 CBC 215 : if (att->attisdropped)
3109 GIC 8 : continue;
3110 :
3111 CBC 207 : if (att->attgenerated)
3112 ECB : {
3113 : /* don't include unless requested */
3114 GIC 9 : if (!include_generated)
3115 3 : continue;
3116 : }
3117 :
3118 ECB : /************************************************************
3119 : * Get the attribute name
3120 : ************************************************************/
3121 GIC 204 : attname = NameStr(att->attname);
3122 :
3123 ECB : /************************************************************
3124 : * Get the attributes value
3125 : ************************************************************/
3126 GIC 204 : attr = heap_getattr(tuple, i + 1, tupdesc, &isnull);
3127 :
3128 : /************************************************************
3129 : * If there is a value, append the attribute name and the
3130 : * value to the list
3131 : *
3132 : * Hmmm - Null attributes will cause functions to
3133 ECB : * crash if they don't expect them - need something
3134 : * smarter here.
3135 : ************************************************************/
3136 GIC 204 : if (!isnull)
3137 ECB : {
3138 CBC 200 : getTypeOutputInfo(att->atttypid,
3139 ECB : &typoutput, &typisvarlena);
3140 CBC 200 : outputstr = OidOutputFunctionCall(typoutput, attr);
3141 200 : UTF_BEGIN;
3142 200 : Tcl_ListObjAppendElement(NULL, retobj,
3143 200 : Tcl_NewStringObj(UTF_E2U(attname), -1));
3144 200 : UTF_END;
3145 200 : UTF_BEGIN;
3146 200 : Tcl_ListObjAppendElement(NULL, retobj,
3147 GIC 200 : Tcl_NewStringObj(UTF_E2U(outputstr), -1));
3148 200 : UTF_END;
3149 200 : pfree(outputstr);
3150 ECB : }
3151 : }
3152 :
3153 GIC 69 : return retobj;
3154 : }
3155 :
3156 : /**********************************************************************
3157 : * pltcl_build_tuple_result() - Build a tuple of function's result rowtype
3158 : * from a Tcl list of column names and values
3159 : *
3160 : * In a trigger function, we build a tuple of the trigger table's rowtype.
3161 : *
3162 : * Note: this function leaks memory. Even if we made it clean up its own
3163 : * mess, there's no way to prevent the datatype input functions it calls
3164 : * from leaking. Run it in a short-lived context, unless we're about to
3165 ECB : * exit the procedure anyway.
3166 : **********************************************************************/
3167 : static HeapTuple
3168 GIC 31 : pltcl_build_tuple_result(Tcl_Interp *interp, Tcl_Obj **kvObjv, int kvObjc,
3169 : pltcl_call_state *call_state)
3170 : {
3171 : HeapTuple tuple;
3172 : TupleDesc tupdesc;
3173 : AttInMetadata *attinmeta;
3174 ECB : char **values;
3175 : int i;
3176 :
3177 CBC 31 : if (call_state->ret_tupdesc)
3178 : {
3179 21 : tupdesc = call_state->ret_tupdesc;
3180 GIC 21 : attinmeta = call_state->attinmeta;
3181 ECB : }
3182 CBC 10 : else if (call_state->trigdata)
3183 : {
3184 GIC 10 : tupdesc = RelationGetDescr(call_state->trigdata->tg_relation);
3185 10 : attinmeta = TupleDescGetAttInMetadata(tupdesc);
3186 EUB : }
3187 : else
3188 : {
3189 UIC 0 : elog(ERROR, "PL/Tcl function does not return a tuple");
3190 : tupdesc = NULL; /* keep compiler quiet */
3191 ECB : attinmeta = NULL;
3192 : }
3193 :
3194 CBC 31 : values = (char **) palloc0(tupdesc->natts * sizeof(char *));
3195 :
3196 GIC 31 : if (kvObjc % 2 != 0)
3197 2 : ereport(ERROR,
3198 ECB : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
3199 : errmsg("column name/value list must have even number of elements")));
3200 :
3201 CBC 98 : for (i = 0; i < kvObjc; i += 2)
3202 : {
3203 GIC 73 : char *fieldName = utf_u2e(Tcl_GetString(kvObjv[i]));
3204 73 : int attn = SPI_fnumber(tupdesc, fieldName);
3205 :
3206 : /*
3207 : * We silently ignore ".tupno", if it's present but doesn't match any
3208 ECB : * actual output column. This allows direct use of a row returned by
3209 : * pltcl_set_tuple_values().
3210 : */
3211 GBC 73 : if (attn == SPI_ERROR_NOATTRIBUTE)
3212 ECB : {
3213 GIC 3 : if (strcmp(fieldName, ".tupno") == 0)
3214 UIC 0 : continue;
3215 GIC 3 : ereport(ERROR,
3216 : (errcode(ERRCODE_UNDEFINED_COLUMN),
3217 : errmsg("column name/value list contains nonexistent column name \"%s\"",
3218 ECB : fieldName)));
3219 EUB : }
3220 :
3221 GIC 70 : if (attn <= 0)
3222 UIC 0 : ereport(ERROR,
3223 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3224 ECB : errmsg("cannot set system attribute \"%s\"",
3225 : fieldName)));
3226 :
3227 GIC 70 : if (TupleDescAttr(tupdesc, attn - 1)->attgenerated)
3228 1 : ereport(ERROR,
3229 : (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
3230 ECB : errmsg("cannot set generated column \"%s\"",
3231 : fieldName)));
3232 :
3233 CBC 69 : values[attn - 1] = utf_u2e(Tcl_GetString(kvObjv[i + 1]));
3234 : }
3235 :
3236 25 : tuple = BuildTupleFromCStrings(attinmeta, values);
3237 ECB :
3238 : /* if result type is domain-over-composite, check domain constraints */
3239 CBC 25 : if (call_state->prodesc->fn_retisdomain)
3240 3 : domain_check(HeapTupleGetDatum(tuple), false,
3241 GIC 3 : call_state->prodesc->result_typid,
3242 CBC 3 : &call_state->prodesc->domain_info,
3243 GIC 3 : call_state->prodesc->fn_cxt);
3244 :
3245 24 : return tuple;
3246 : }
3247 :
3248 : /**********************************************************************
3249 ECB : * pltcl_init_tuple_store() - Initialize the result tuplestore for a SRF
3250 : **********************************************************************/
3251 : static void
3252 GIC 5 : pltcl_init_tuple_store(pltcl_call_state *call_state)
3253 : {
3254 5 : ReturnSetInfo *rsi = call_state->rsi;
3255 : MemoryContext oldcxt;
3256 ECB : ResourceOwner oldowner;
3257 :
3258 : /* Should be in a SRF */
3259 CBC 5 : Assert(rsi);
3260 : /* Should be first time through */
3261 GIC 5 : Assert(!call_state->tuple_store);
3262 CBC 5 : Assert(!call_state->attinmeta);
3263 ECB :
3264 : /* We expect caller to provide an appropriate result tupdesc */
3265 GIC 5 : Assert(rsi->expectedDesc);
3266 5 : call_state->ret_tupdesc = rsi->expectedDesc;
3267 :
3268 : /*
3269 : * Switch to the right memory context and resource owner for storing the
3270 : * tuplestore. If we're within a subtransaction opened for an exception
3271 : * block, for example, we must still create the tuplestore in the resource
3272 ECB : * owner that was active when this function was entered, and not in the
3273 : * subtransaction's resource owner.
3274 : */
3275 GIC 5 : oldcxt = MemoryContextSwitchTo(call_state->tuple_store_cxt);
3276 CBC 5 : oldowner = CurrentResourceOwner;
3277 5 : CurrentResourceOwner = call_state->tuple_store_owner;
3278 :
3279 GIC 5 : call_state->tuple_store =
3280 5 : tuplestore_begin_heap(rsi->allowedModes & SFRM_Materialize_Random,
3281 ECB : false, work_mem);
3282 :
3283 : /* Build attinmeta in this context, too */
3284 CBC 5 : call_state->attinmeta = TupleDescGetAttInMetadata(call_state->ret_tupdesc);
3285 ECB :
3286 GIC 5 : CurrentResourceOwner = oldowner;
3287 5 : MemoryContextSwitchTo(oldcxt);
3288 5 : }
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