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pl_handler.c
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1 /*-------------------------------------------------------------------------
2  *
3  * pl_handler.c - Handler for the PL/pgSQL
4  * procedural language
5  *
6  * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
7  * Portions Copyright (c) 1994, Regents of the University of California
8  *
9  *
10  * IDENTIFICATION
11  * src/pl/plpgsql/src/pl_handler.c
12  *
13  *-------------------------------------------------------------------------
14  */
15 
16 #include "postgres.h"
17 
18 #include "access/htup_details.h"
19 #include "catalog/pg_proc.h"
20 #include "catalog/pg_type.h"
21 #include "funcapi.h"
22 #include "miscadmin.h"
23 #include "plpgsql.h"
24 #include "utils/builtins.h"
25 #include "utils/guc.h"
26 #include "utils/lsyscache.h"
27 #include "utils/syscache.h"
28 #include "utils/varlena.h"
29 
30 static bool plpgsql_extra_checks_check_hook(char **newvalue, void **extra, GucSource source);
31 static void plpgsql_extra_warnings_assign_hook(const char *newvalue, void *extra);
32 static void plpgsql_extra_errors_assign_hook(const char *newvalue, void *extra);
33 
35 
36 /* Custom GUC variable */
38  {"error", PLPGSQL_RESOLVE_ERROR, false},
39  {"use_variable", PLPGSQL_RESOLVE_VARIABLE, false},
40  {"use_column", PLPGSQL_RESOLVE_COLUMN, false},
41  {NULL, 0, false}
42 };
43 
45 
47 
49 
54 
55 /* Hook for plugins */
57 
58 
59 static bool
60 plpgsql_extra_checks_check_hook(char **newvalue, void **extra, GucSource source)
61 {
62  char *rawstring;
63  List *elemlist;
64  ListCell *l;
65  int extrachecks = 0;
66  int *myextra;
67 
68  if (pg_strcasecmp(*newvalue, "all") == 0)
69  extrachecks = PLPGSQL_XCHECK_ALL;
70  else if (pg_strcasecmp(*newvalue, "none") == 0)
71  extrachecks = PLPGSQL_XCHECK_NONE;
72  else
73  {
74  /* Need a modifiable copy of string */
75  rawstring = pstrdup(*newvalue);
76 
77  /* Parse string into list of identifiers */
78  if (!SplitIdentifierString(rawstring, ',', &elemlist))
79  {
80  /* syntax error in list */
81  GUC_check_errdetail("List syntax is invalid.");
82  pfree(rawstring);
83  list_free(elemlist);
84  return false;
85  }
86 
87  foreach(l, elemlist)
88  {
89  char *tok = (char *) lfirst(l);
90 
91  if (pg_strcasecmp(tok, "shadowed_variables") == 0)
92  extrachecks |= PLPGSQL_XCHECK_SHADOWVAR;
93  else if (pg_strcasecmp(tok, "too_many_rows") == 0)
94  extrachecks |= PLPGSQL_XCHECK_TOOMANYROWS;
95  else if (pg_strcasecmp(tok, "strict_multi_assignment") == 0)
97  else if (pg_strcasecmp(tok, "all") == 0 || pg_strcasecmp(tok, "none") == 0)
98  {
99  GUC_check_errdetail("Key word \"%s\" cannot be combined with other key words.", tok);
100  pfree(rawstring);
101  list_free(elemlist);
102  return false;
103  }
104  else
105  {
106  GUC_check_errdetail("Unrecognized key word: \"%s\".", tok);
107  pfree(rawstring);
108  list_free(elemlist);
109  return false;
110  }
111  }
112 
113  pfree(rawstring);
114  list_free(elemlist);
115  }
116 
117  myextra = (int *) malloc(sizeof(int));
118  if (!myextra)
119  return false;
120  *myextra = extrachecks;
121  *extra = (void *) myextra;
122 
123  return true;
124 }
125 
126 static void
127 plpgsql_extra_warnings_assign_hook(const char *newvalue, void *extra)
128 {
129  plpgsql_extra_warnings = *((int *) extra);
130 }
131 
132 static void
133 plpgsql_extra_errors_assign_hook(const char *newvalue, void *extra)
134 {
135  plpgsql_extra_errors = *((int *) extra);
136 }
137 
138 
139 /*
140  * _PG_init() - library load-time initialization
141  *
142  * DO NOT make this static nor change its name!
143  */
144 void
145 _PG_init(void)
146 {
147  /* Be sure we do initialization only once (should be redundant now) */
148  static bool inited = false;
149 
150  if (inited)
151  return;
152 
154 
155  DefineCustomEnumVariable("plpgsql.variable_conflict",
156  gettext_noop("Sets handling of conflicts between PL/pgSQL variable names and table column names."),
157  NULL,
160  variable_conflict_options,
161  PGC_SUSET, 0,
162  NULL, NULL, NULL);
163 
164  DefineCustomBoolVariable("plpgsql.print_strict_params",
165  gettext_noop("Print information about parameters in the DETAIL part of the error messages generated on INTO ... STRICT failures."),
166  NULL,
168  false,
169  PGC_USERSET, 0,
170  NULL, NULL, NULL);
171 
172  DefineCustomBoolVariable("plpgsql.check_asserts",
173  gettext_noop("Perform checks given in ASSERT statements."),
174  NULL,
176  true,
177  PGC_USERSET, 0,
178  NULL, NULL, NULL);
179 
180  DefineCustomStringVariable("plpgsql.extra_warnings",
181  gettext_noop("List of programming constructs that should produce a warning."),
182  NULL,
184  "none",
188  NULL);
189 
190  DefineCustomStringVariable("plpgsql.extra_errors",
191  gettext_noop("List of programming constructs that should produce an error."),
192  NULL,
194  "none",
198  NULL);
199 
200  EmitWarningsOnPlaceholders("plpgsql");
201 
205 
206  /* Set up a rendezvous point with optional instrumentation plugin */
207  plpgsql_plugin_ptr = (PLpgSQL_plugin **) find_rendezvous_variable("PLpgSQL_plugin");
208 
209  inited = true;
210 }
211 
212 /* ----------
213  * plpgsql_call_handler
214  *
215  * The PostgreSQL function manager and trigger manager
216  * call this function for execution of PL/pgSQL procedures.
217  * ----------
218  */
220 
221 Datum
223 {
224  bool nonatomic;
225  PLpgSQL_function *func;
226  PLpgSQL_execstate *save_cur_estate;
227  Datum retval;
228  int rc;
229 
230  nonatomic = fcinfo->context &&
231  IsA(fcinfo->context, CallContext) &&
232  !castNode(CallContext, fcinfo->context)->atomic;
233 
234  /*
235  * Connect to SPI manager
236  */
237  if ((rc = SPI_connect_ext(nonatomic ? SPI_OPT_NONATOMIC : 0)) != SPI_OK_CONNECT)
238  elog(ERROR, "SPI_connect failed: %s", SPI_result_code_string(rc));
239 
240  /* Find or compile the function */
241  func = plpgsql_compile(fcinfo, false);
242 
243  /* Must save and restore prior value of cur_estate */
244  save_cur_estate = func->cur_estate;
245 
246  /* Mark the function as busy, so it can't be deleted from under us */
247  func->use_count++;
248 
249  PG_TRY();
250  {
251  /*
252  * Determine if called as function or trigger and call appropriate
253  * subhandler
254  */
255  if (CALLED_AS_TRIGGER(fcinfo))
257  (TriggerData *) fcinfo->context));
258  else if (CALLED_AS_EVENT_TRIGGER(fcinfo))
259  {
261  (EventTriggerData *) fcinfo->context);
262  retval = (Datum) 0;
263  }
264  else
265  retval = plpgsql_exec_function(func, fcinfo,
266  NULL, NULL,
267  !nonatomic);
268  }
269  PG_FINALLY();
270  {
271  /* Decrement use-count, restore cur_estate */
272  func->use_count--;
273  func->cur_estate = save_cur_estate;
274  }
275  PG_END_TRY();
276 
277  /*
278  * Disconnect from SPI manager
279  */
280  if ((rc = SPI_finish()) != SPI_OK_FINISH)
281  elog(ERROR, "SPI_finish failed: %s", SPI_result_code_string(rc));
282 
283  return retval;
284 }
285 
286 /* ----------
287  * plpgsql_inline_handler
288  *
289  * Called by PostgreSQL to execute an anonymous code block
290  * ----------
291  */
293 
294 Datum
296 {
297  LOCAL_FCINFO(fake_fcinfo, 0);
299  PLpgSQL_function *func;
300  FmgrInfo flinfo;
301  EState *simple_eval_estate;
302  ResourceOwner simple_eval_resowner;
303  Datum retval;
304  int rc;
305 
306  /*
307  * Connect to SPI manager
308  */
309  if ((rc = SPI_connect_ext(codeblock->atomic ? 0 : SPI_OPT_NONATOMIC)) != SPI_OK_CONNECT)
310  elog(ERROR, "SPI_connect failed: %s", SPI_result_code_string(rc));
311 
312  /* Compile the anonymous code block */
313  func = plpgsql_compile_inline(codeblock->source_text);
314 
315  /* Mark the function as busy, just pro forma */
316  func->use_count++;
317 
318  /*
319  * Set up a fake fcinfo with just enough info to satisfy
320  * plpgsql_exec_function(). In particular note that this sets things up
321  * with no arguments passed.
322  */
323  MemSet(fake_fcinfo, 0, SizeForFunctionCallInfo(0));
324  MemSet(&flinfo, 0, sizeof(flinfo));
325  fake_fcinfo->flinfo = &flinfo;
326  flinfo.fn_oid = InvalidOid;
327  flinfo.fn_mcxt = CurrentMemoryContext;
328 
329  /*
330  * Create a private EState and resowner for simple-expression execution.
331  * Notice that these are NOT tied to transaction-level resources; they
332  * must survive any COMMIT/ROLLBACK the DO block executes, since we will
333  * unconditionally try to clean them up below. (Hence, be wary of adding
334  * anything that could fail between here and the PG_TRY block.) See the
335  * comments for shared_simple_eval_estate.
336  */
337  simple_eval_estate = CreateExecutorState();
338  simple_eval_resowner =
339  ResourceOwnerCreate(NULL, "PL/pgSQL DO block simple expressions");
340 
341  /* And run the function */
342  PG_TRY();
343  {
344  retval = plpgsql_exec_function(func, fake_fcinfo,
345  simple_eval_estate,
346  simple_eval_resowner,
347  codeblock->atomic);
348  }
349  PG_CATCH();
350  {
351  /*
352  * We need to clean up what would otherwise be long-lived resources
353  * accumulated by the failed DO block, principally cached plans for
354  * statements (which can be flushed by plpgsql_free_function_memory),
355  * execution trees for simple expressions, which are in the private
356  * EState, and cached-plan refcounts held by the private resowner.
357  *
358  * Before releasing the private EState, we must clean up any
359  * simple_econtext_stack entries pointing into it, which we can do by
360  * invoking the subxact callback. (It will be called again later if
361  * some outer control level does a subtransaction abort, but no harm
362  * is done.) We cheat a bit knowing that plpgsql_subxact_cb does not
363  * pay attention to its parentSubid argument.
364  */
367  0, NULL);
368 
369  /* Clean up the private EState and resowner */
370  FreeExecutorState(simple_eval_estate);
371  ResourceOwnerReleaseAllPlanCacheRefs(simple_eval_resowner);
372  ResourceOwnerDelete(simple_eval_resowner);
373 
374  /* Function should now have no remaining use-counts ... */
375  func->use_count--;
376  Assert(func->use_count == 0);
377 
378  /* ... so we can free subsidiary storage */
380 
381  /* And propagate the error */
382  PG_RE_THROW();
383  }
384  PG_END_TRY();
385 
386  /* Clean up the private EState and resowner */
387  FreeExecutorState(simple_eval_estate);
388  ResourceOwnerReleaseAllPlanCacheRefs(simple_eval_resowner);
389  ResourceOwnerDelete(simple_eval_resowner);
390 
391  /* Function should now have no remaining use-counts ... */
392  func->use_count--;
393  Assert(func->use_count == 0);
394 
395  /* ... so we can free subsidiary storage */
397 
398  /*
399  * Disconnect from SPI manager
400  */
401  if ((rc = SPI_finish()) != SPI_OK_FINISH)
402  elog(ERROR, "SPI_finish failed: %s", SPI_result_code_string(rc));
403 
404  return retval;
405 }
406 
407 /* ----------
408  * plpgsql_validator
409  *
410  * This function attempts to validate a PL/pgSQL function at
411  * CREATE FUNCTION time.
412  * ----------
413  */
415 
416 Datum
418 {
419  Oid funcoid = PG_GETARG_OID(0);
420  HeapTuple tuple;
421  Form_pg_proc proc;
422  char functyptype;
423  int numargs;
424  Oid *argtypes;
425  char **argnames;
426  char *argmodes;
427  bool is_dml_trigger = false;
428  bool is_event_trigger = false;
429  int i;
430 
431  if (!CheckFunctionValidatorAccess(fcinfo->flinfo->fn_oid, funcoid))
432  PG_RETURN_VOID();
433 
434  /* Get the new function's pg_proc entry */
435  tuple = SearchSysCache1(PROCOID, ObjectIdGetDatum(funcoid));
436  if (!HeapTupleIsValid(tuple))
437  elog(ERROR, "cache lookup failed for function %u", funcoid);
438  proc = (Form_pg_proc) GETSTRUCT(tuple);
439 
440  functyptype = get_typtype(proc->prorettype);
441 
442  /* Disallow pseudotype result */
443  /* except for TRIGGER, EVTTRIGGER, RECORD, VOID, or polymorphic */
444  if (functyptype == TYPTYPE_PSEUDO)
445  {
446  if (proc->prorettype == TRIGGEROID)
447  is_dml_trigger = true;
448  else if (proc->prorettype == EVTTRIGGEROID)
449  is_event_trigger = true;
450  else if (proc->prorettype != RECORDOID &&
451  proc->prorettype != VOIDOID &&
452  !IsPolymorphicType(proc->prorettype))
453  ereport(ERROR,
454  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
455  errmsg("PL/pgSQL functions cannot return type %s",
456  format_type_be(proc->prorettype))));
457  }
458 
459  /* Disallow pseudotypes in arguments (either IN or OUT) */
460  /* except for RECORD and polymorphic */
461  numargs = get_func_arg_info(tuple,
462  &argtypes, &argnames, &argmodes);
463  for (i = 0; i < numargs; i++)
464  {
465  if (get_typtype(argtypes[i]) == TYPTYPE_PSEUDO)
466  {
467  if (argtypes[i] != RECORDOID &&
468  !IsPolymorphicType(argtypes[i]))
469  ereport(ERROR,
470  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
471  errmsg("PL/pgSQL functions cannot accept type %s",
472  format_type_be(argtypes[i]))));
473  }
474  }
475 
476  /* Postpone body checks if !check_function_bodies */
478  {
479  LOCAL_FCINFO(fake_fcinfo, 0);
480  FmgrInfo flinfo;
481  int rc;
482  TriggerData trigdata;
483  EventTriggerData etrigdata;
484 
485  /*
486  * Connect to SPI manager (is this needed for compilation?)
487  */
488  if ((rc = SPI_connect()) != SPI_OK_CONNECT)
489  elog(ERROR, "SPI_connect failed: %s", SPI_result_code_string(rc));
490 
491  /*
492  * Set up a fake fcinfo with just enough info to satisfy
493  * plpgsql_compile().
494  */
495  MemSet(fake_fcinfo, 0, SizeForFunctionCallInfo(0));
496  MemSet(&flinfo, 0, sizeof(flinfo));
497  fake_fcinfo->flinfo = &flinfo;
498  flinfo.fn_oid = funcoid;
499  flinfo.fn_mcxt = CurrentMemoryContext;
500  if (is_dml_trigger)
501  {
502  MemSet(&trigdata, 0, sizeof(trigdata));
503  trigdata.type = T_TriggerData;
504  fake_fcinfo->context = (Node *) &trigdata;
505  }
506  else if (is_event_trigger)
507  {
508  MemSet(&etrigdata, 0, sizeof(etrigdata));
509  etrigdata.type = T_EventTriggerData;
510  fake_fcinfo->context = (Node *) &etrigdata;
511  }
512 
513  /* Test-compile the function */
514  plpgsql_compile(fake_fcinfo, true);
515 
516  /*
517  * Disconnect from SPI manager
518  */
519  if ((rc = SPI_finish()) != SPI_OK_FINISH)
520  elog(ERROR, "SPI_finish failed: %s", SPI_result_code_string(rc));
521  }
522 
523  ReleaseSysCache(tuple);
524 
525  PG_RETURN_VOID();
526 }
PLpgSQL_function * plpgsql_compile_inline(char *proc_source)
Definition: pl_comp.c:843
#define SPI_OK_CONNECT
Definition: spi.h:53
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Definition: pl_funcs.c:737
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#define PG_FUNCTION_ARGS
Definition: fmgr.h:193
HeapTuple plpgsql_exec_trigger(PLpgSQL_function *func, TriggerData *trigdata)
Definition: pl_exec.c:901
bool plpgsql_check_asserts
Definition: pl_handler.c:48
#define PG_TRY()
Definition: elog.h:295
void DefineCustomBoolVariable(const char *name, const char *short_desc, const char *long_desc, bool *valueAddr, bool bootValue, GucContext context, int flags, GucBoolCheckHook check_hook, GucBoolAssignHook assign_hook, GucShowHook show_hook)
Definition: guc.c:8800
Definition: pg_list.h:50
Datum plpgsql_call_handler(PG_FUNCTION_ARGS)
Definition: pl_handler.c:222
#define PG_END_TRY()
Definition: elog.h:320
#define GUC_LIST_INPUT
Definition: guc.h:204
#define PLPGSQL_XCHECK_ALL
Definition: plpgsql.h:1210
void plpgsql_xact_cb(XactEvent event, void *arg)
Definition: pl_exec.c:8473
ResourceOwner ResourceOwnerCreate(ResourceOwner parent, const char *name)
Definition: resowner.c:422