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pl_comp.c
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1 /*-------------------------------------------------------------------------
2  *
3  * pl_comp.c - Compiler part of the PL/pgSQL
4  * procedural language
5  *
6  * Portions Copyright (c) 1996-2023, 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_comp.c
12  *
13  *-------------------------------------------------------------------------
14  */
15 
16 #include "postgres.h"
17 
18 #include <ctype.h>
19 
20 #include "access/htup_details.h"
21 #include "catalog/namespace.h"
22 #include "catalog/pg_proc.h"
23 #include "catalog/pg_type.h"
24 #include "funcapi.h"
25 #include "nodes/makefuncs.h"
26 #include "parser/parse_type.h"
27 #include "plpgsql.h"
28 #include "utils/builtins.h"
29 #include "utils/fmgroids.h"
30 #include "utils/guc.h"
31 #include "utils/lsyscache.h"
32 #include "utils/memutils.h"
33 #include "utils/regproc.h"
34 #include "utils/rel.h"
35 #include "utils/syscache.h"
36 #include "utils/typcache.h"
37 
38 /* ----------
39  * Our own local and global variables
40  * ----------
41  */
42 PLpgSQL_stmt_block *plpgsql_parse_result;
43 
44 static int datums_alloc;
45 int plpgsql_nDatums;
46 PLpgSQL_datum **plpgsql_Datums;
47 static int datums_last;
48 
49 char *plpgsql_error_funcname;
50 bool plpgsql_DumpExecTree = false;
51 bool plpgsql_check_syntax = false;
52 
53 PLpgSQL_function *plpgsql_curr_compile;
54 
55 /* A context appropriate for short-term allocs during compilation */
56 MemoryContext plpgsql_compile_tmp_cxt;
57 
58 /* ----------
59  * Hash table for compiled functions
60  * ----------
61  */
62 static HTAB *plpgsql_HashTable = NULL;
63 
64 typedef struct plpgsql_hashent
65 {
66  PLpgSQL_func_hashkey key;
67  PLpgSQL_function *function;
68 } plpgsql_HashEnt;
69 
70 #define FUNCS_PER_USER 128 /* initial table size */
71 
72 /* ----------
73  * Lookup table for EXCEPTION condition names
74  * ----------
75  */
76 typedef struct
77 {
78  const char *label;
79  int sqlerrstate;
80 } ExceptionLabelMap;
81 
82 static const ExceptionLabelMap exception_label_map[] = {
83 #include "plerrcodes.h" /* pgrminclude ignore */
84  {NULL, 0}
85 };
86 
87 
88 /* ----------
89  * static prototypes
90  * ----------
91  */
92 static PLpgSQL_function *do_compile(FunctionCallInfo fcinfo,
93  HeapTuple procTup,
94  PLpgSQL_function *function,
95  PLpgSQL_func_hashkey *hashkey,
96  bool forValidator);
97 static void plpgsql_compile_error_callback(void *arg);
98 static void add_parameter_name(PLpgSQL_nsitem_type itemtype, int itemno, const char *name);
99 static void add_dummy_return(PLpgSQL_function *function);
100 static Node *plpgsql_pre_column_ref(ParseState *pstate, ColumnRef *cref);
101 static Node *plpgsql_post_column_ref(ParseState *pstate, ColumnRef *cref, Node *var);
102 static Node *plpgsql_param_ref(ParseState *pstate, ParamRef *pref);
103 static Node *resolve_column_ref(ParseState *pstate, PLpgSQL_expr *expr,
104  ColumnRef *cref, bool error_if_no_field);
105 static Node *make_datum_param(PLpgSQL_expr *expr, int dno, int location);
106 static PLpgSQL_row *build_row_from_vars(PLpgSQL_variable **vars, int numvars);
107 static PLpgSQL_type *build_datatype(HeapTuple typeTup, int32 typmod,
108  Oid collation, TypeName *origtypname);
109 static void plpgsql_start_datums(void);
110 static void plpgsql_finish_datums(PLpgSQL_function *function);
111 static void compute_function_hashkey(FunctionCallInfo fcinfo,
112  Form_pg_proc procStruct,
113  PLpgSQL_func_hashkey *hashkey,
114  bool forValidator);
115 static void plpgsql_resolve_polymorphic_argtypes(int numargs,
116  Oid *argtypes, char *argmodes,
117  Node *call_expr, bool forValidator,
118  const char *proname);
119 static PLpgSQL_function *plpgsql_HashTableLookup(PLpgSQL_func_hashkey *func_key);
120 static void plpgsql_HashTableInsert(PLpgSQL_function *function,
121  PLpgSQL_func_hashkey *func_key);
122 static void plpgsql_HashTableDelete(PLpgSQL_function *function);
123 static void delete_function(PLpgSQL_function *func);
124 
125 /* ----------
126  * plpgsql_compile Make an execution tree for a PL/pgSQL function.
127  *
128  * If forValidator is true, we're only compiling for validation purposes,
129  * and so some checks are skipped.
130  *
131  * Note: it's important for this to fall through quickly if the function
132  * has already been compiled.
133  * ----------
134  */
135 PLpgSQL_function *
136 plpgsql_compile(FunctionCallInfo fcinfo, bool forValidator)
137 {
138  Oid funcOid = fcinfo->flinfo->fn_oid;
139  HeapTuple procTup;
140  Form_pg_proc procStruct;
141  PLpgSQL_function *function;
142  PLpgSQL_func_hashkey hashkey;
143  bool function_valid = false;
144  bool hashkey_valid = false;
145 
146  /*
147  * Lookup the pg_proc tuple by Oid; we'll need it in any case
148  */
149  procTup = SearchSysCache1(PROCOID, ObjectIdGetDatum(funcOid));
150  if (!HeapTupleIsValid(procTup))
151  elog(ERROR, "cache lookup failed for function %u", funcOid);
152  procStruct = (Form_pg_proc) GETSTRUCT(procTup);
153 
154  /*
155  * See if there's already a cache entry for the current FmgrInfo. If not,
156  * try to find one in the hash table.
157  */
158  function = (PLpgSQL_function *) fcinfo->flinfo->fn_extra;
159 
160 recheck:
161  if (!function)
162  {
163  /* Compute hashkey using function signature and actual arg types */
164  compute_function_hashkey(fcinfo, procStruct, &hashkey, forValidator);
165  hashkey_valid = true;
166 
167  /* And do the lookup */
168  function = plpgsql_HashTableLookup(&hashkey);
169  }
170 
171  if (function)
172  {
173  /* We have a compiled function, but is it still valid? */
174  if (function->fn_xmin == HeapTupleHeaderGetRawXmin(procTup->t_data) &&
175  ItemPointerEquals(&function->fn_tid, &procTup->t_self))
176  function_valid = true;
177  else
178  {
179  /*
180  * Nope, so remove it from hashtable and try to drop associated
181  * storage (if not done already).
182  */
183  delete_function(function);
184 
185  /*
186  * If the function isn't in active use then we can overwrite the
187  * func struct with new data, allowing any other existing fn_extra
188  * pointers to make use of the new definition on their next use.
189  * If it is in use then just leave it alone and make a new one.
190  * (The active invocations will run to completion using the
191  * previous definition, and then the cache entry will just be
192  * leaked; doesn't seem worth adding code to clean it up, given
193  * what a corner case this is.)
194  *
195  * If we found the function struct via fn_extra then it's possible
196  * a replacement has already been made, so go back and recheck the
197  * hashtable.
198  */
199  if (function->use_count != 0)
200  {
201  function = NULL;
202  if (!hashkey_valid)
203  goto recheck;
204  }
205  }
206  }
207 
208  /*
209  * If the function wasn't found or was out-of-date, we have to compile it
210  */
211  if (!function_valid)
212  {
213  /*
214  * Calculate hashkey if we didn't already; we'll need it to store the
215  * completed function.
216  */
217  if (!hashkey_valid)
218  compute_function_hashkey(fcinfo, procStruct, &hashkey,
219  forValidator);
220 
221  /*
222  * Do the hard part.
223  */
224  function = do_compile(fcinfo, procTup, function,
225  &hashkey, forValidator);
226  }
227 
228  ReleaseSysCache(procTup);
229 
230  /*
231  * Save pointer in FmgrInfo to avoid search on subsequent calls
232  */
233  fcinfo->flinfo->fn_extra = (void *) function;
234 
235  /*
236  * Finally return the compiled function
237  */
238  return function;
239 }
240 
241 /*
242  * This is the slow part of plpgsql_compile().
243  *
244  * The passed-in "function" pointer is either NULL or an already-allocated
245  * function struct to overwrite.
246  *
247  * While compiling a function, the CurrentMemoryContext is the
248  * per-function memory context of the function we are compiling. That
249  * means a palloc() will allocate storage with the same lifetime as
250  * the function itself.
251  *
252  * Because palloc()'d storage will not be immediately freed, temporary
253  * allocations should either be performed in a short-lived memory
254  * context or explicitly pfree'd. Since not all backend functions are
255  * careful about pfree'ing their allocations, it is also wise to
256  * switch into a short-term context before calling into the
257  * backend. An appropriate context for performing short-term
258  * allocations is the plpgsql_compile_tmp_cxt.
259  *
260  * NB: this code is not re-entrant. We assume that nothing we do here could
261  * result in the invocation of another plpgsql function.
262  */
263 static PLpgSQL_function *
264 do_compile(FunctionCallInfo fcinfo,
265  HeapTuple procTup,
266  PLpgSQL_function *function,
267  PLpgSQL_func_hashkey *hashkey,
268  bool forValidator)
269 {
270  Form_pg_proc procStruct = (Form_pg_proc) GETSTRUCT(procTup);
271  bool is_dml_trigger = CALLED_AS_TRIGGER(fcinfo);
272  bool is_event_trigger = CALLED_AS_EVENT_TRIGGER(fcinfo);
273  Datum prosrcdatum;
274  bool isnull;
275  char *proc_source;
276  HeapTuple typeTup;
277  Form_pg_type typeStruct;
278  PLpgSQL_variable *var;
279  PLpgSQL_rec *rec;
280  int i;
281  ErrorContextCallback plerrcontext;
282  int parse_rc;
283  Oid rettypeid;
284  int numargs;
285  int num_in_args = 0;
286  int num_out_args = 0;
287  Oid *argtypes;
288  char **argnames;
289  char *argmodes;
290  int *in_arg_varnos = NULL;
291  PLpgSQL_variable **out_arg_variables;
292  MemoryContext func_cxt;
293 
294  /*
295  * Setup the scanner input and error info. We assume that this function
296  * cannot be invoked recursively, so there's no need to save and restore
297  * the static variables used here.
298  */
299  prosrcdatum = SysCacheGetAttr(PROCOID, procTup,
300  Anum_pg_proc_prosrc, &isnull);
301  if (isnull)
302  elog(ERROR, "null prosrc");
303  proc_source = TextDatumGetCString(prosrcdatum);
304  plpgsql_scanner_init(proc_source);
305 
306  plpgsql_error_funcname = pstrdup(NameStr(procStruct->proname));
307 
308  /*
309  * Setup error traceback support for ereport()
310  */
311  plerrcontext.callback = plpgsql_compile_error_callback;
312  plerrcontext.arg = forValidator ? proc_source : NULL;
313  plerrcontext.previous = error_context_stack;
314  error_context_stack = &plerrcontext;
315 
316  /*
317  * Do extra syntax checks when validating the function definition. We skip
318  * this when actually compiling functions for execution, for performance
319  * reasons.
320  */
321  plpgsql_check_syntax = forValidator;
322 
323  /*
324  * Create the new function struct, if not done already. The function
325  * structs are never thrown away, so keep them in TopMemoryContext.
326  */
327  if (function == NULL)
328  {
329  function = (PLpgSQL_function *)
330  MemoryContextAllocZero(TopMemoryContext, sizeof(PLpgSQL_function));
331  }
332  else
333  {
334  /* re-using a previously existing struct, so clear it out */
335  memset(function, 0, sizeof(PLpgSQL_function));
336  }
337  plpgsql_curr_compile = function;
338 
339  /*
340  * All the permanent output of compilation (e.g. parse tree) is kept in a
341  * per-function memory context, so it can be reclaimed easily.
342  */
343  func_cxt = AllocSetContextCreate(TopMemoryContext,
344  "PL/pgSQL function",
345  ALLOCSET_DEFAULT_SIZES);
346  plpgsql_compile_tmp_cxt = MemoryContextSwitchTo(func_cxt);
347 
348  function->fn_signature = format_procedure(fcinfo->flinfo->fn_oid);
349  MemoryContextSetIdentifier(func_cxt, function->fn_signature);
350  function->fn_oid = fcinfo->flinfo->fn_oid;
351  function->fn_xmin = HeapTupleHeaderGetRawXmin(procTup->t_data);
352  function->fn_tid = procTup->t_self;
353  function->fn_input_collation = fcinfo->fncollation;
354  function->fn_cxt = func_cxt;
355  function->out_param_varno = -1; /* set up for no OUT param */
356  function->resolve_option = plpgsql_variable_conflict;
357  function->print_strict_params = plpgsql_print_strict_params;
358  /* only promote extra warnings and errors at CREATE FUNCTION time */
359  function->extra_warnings = forValidator ? plpgsql_extra_warnings : 0;
360  function->extra_errors = forValidator ? plpgsql_extra_errors : 0;
361 
362  if (is_dml_trigger)
363  function->fn_is_trigger = PLPGSQL_DML_TRIGGER;
364  else if (is_event_trigger)
365  function->fn_is_trigger = PLPGSQL_EVENT_TRIGGER;
366  else
367  function->fn_is_trigger = PLPGSQL_NOT_TRIGGER;
368 
369  function->fn_prokind = procStruct->prokind;
370 
371  function->nstatements = 0;
372  function->requires_procedure_resowner = false;
373 
374  /*
375  * Initialize the compiler, particularly the namespace stack. The
376  * outermost namespace contains function parameters and other special
377  * variables (such as FOUND), and is named after the function itself.
378  */
379  plpgsql_ns_init();
380  plpgsql_ns_push(NameStr(procStruct->proname), PLPGSQL_LABEL_BLOCK);
381  plpgsql_DumpExecTree = false;
382  plpgsql_start_datums();
383 
384  switch (function->fn_is_trigger)
385  {
386  case PLPGSQL_NOT_TRIGGER:
387 
388  /*
389  * Fetch info about the procedure's parameters. Allocations aren't
390  * needed permanently, so make them in tmp cxt.
391  *
392  * We also need to resolve any polymorphic input or output
393  * argument types. In validation mode we won't be able to, so we
394  * arbitrarily assume we are dealing with integers.
395  */
396  MemoryContextSwitchTo(plpgsql_compile_tmp_cxt);
397 
398  numargs = get_func_arg_info(procTup,
399  &argtypes, &argnames, &argmodes);
400 
401  plpgsql_resolve_polymorphic_argtypes(numargs, argtypes, argmodes,
402  fcinfo->flinfo->fn_expr,
403  forValidator,
404  plpgsql_error_funcname);
405 
406  in_arg_varnos = (int *) palloc(numargs * sizeof(int));
407  out_arg_variables = (PLpgSQL_variable **) palloc(numargs * sizeof(PLpgSQL_variable *));
408 
409  MemoryContextSwitchTo(func_cxt);
410 
411  /*
412  * Create the variables for the procedure's parameters.
413  */
414  for (i = 0; i < numargs; i++)
415  {
416  char buf[32];
417  Oid argtypeid = argtypes[i];
418  char argmode = argmodes ? argmodes[i] : PROARGMODE_IN;
419  PLpgSQL_type *argdtype;
420  PLpgSQL_variable *argvariable;
421  PLpgSQL_nsitem_type argitemtype;
422 
423  /* Create $n name for variable */
424  snprintf(buf, sizeof(buf), "$%d", i + 1);
425 
426  /* Create datatype info */
427  argdtype = plpgsql_build_datatype(argtypeid,
428  -1,
429  function->fn_input_collation,
430  NULL);
431 
432  /* Disallow pseudotype argument */
433  /* (note we already replaced polymorphic types) */
434  /* (build_variable would do this, but wrong message) */
435  if (argdtype->ttype == PLPGSQL_TTYPE_PSEUDO)
436  ereport(ERROR,
437  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
438  errmsg("PL/pgSQL functions cannot accept type %s",
439  format_type_be(argtypeid))));
440 
441  /*
442  * Build variable and add to datum list. If there's a name
443  * for the argument, use that as refname, else use $n name.
444  */
445  argvariable = plpgsql_build_variable((argnames &&
446  argnames[i][0] != '\0') ?
447  argnames[i] : buf,
448  0, argdtype, false);
449 
450  if (argvariable->dtype == PLPGSQL_DTYPE_VAR)
451  {
452  argitemtype = PLPGSQL_NSTYPE_VAR;
453  }
454  else
455  {
456  Assert(argvariable->dtype == PLPGSQL_DTYPE_REC);
457  argitemtype = PLPGSQL_NSTYPE_REC;
458  }
459 
460  /* Remember arguments in appropriate arrays */
461  if (argmode == PROARGMODE_IN ||
462  argmode == PROARGMODE_INOUT ||
463  argmode == PROARGMODE_VARIADIC)
464  in_arg_varnos[num_in_args++] = argvariable->dno;
465  if (argmode == PROARGMODE_OUT ||
466  argmode == PROARGMODE_INOUT ||
467  argmode == PROARGMODE_TABLE)
468  out_arg_variables[num_out_args++] = argvariable;
469 
470  /* Add to namespace under the $n name */
471  add_parameter_name(argitemtype, argvariable->dno, buf);
472 
473  /* If there's a name for the argument, make an alias */
474  if (argnames && argnames[i][0] != '\0')
475  add_parameter_name(argitemtype, argvariable->dno,
476  argnames[i]);
477  }
478 
479  /*
480  * If there's just one OUT parameter, out_param_varno points
481  * directly to it. If there's more than one, build a row that
482  * holds all of them. Procedures return a row even for one OUT
483  * parameter.
484  */
485  if (num_out_args > 1 ||
486  (num_out_args == 1 && function->fn_prokind == PROKIND_PROCEDURE))
487  {
488  PLpgSQL_row *row = build_row_from_vars(out_arg_variables,
489  num_out_args);
490 
491  plpgsql_adddatum((PLpgSQL_datum *) row);
492  function->out_param_varno = row->dno;
493  }
494  else if (num_out_args == 1)
495  function->out_param_varno = out_arg_variables[0]->dno;
496 
497  /*
498  * Check for a polymorphic returntype. If found, use the actual
499  * returntype type from the caller's FuncExpr node, if we have
500  * one. (In validation mode we arbitrarily assume we are dealing
501  * with integers.)
502  *
503  * Note: errcode is FEATURE_NOT_SUPPORTED because it should always
504  * work; if it doesn't we're in some context that fails to make
505  * the info available.
506  */
507  rettypeid = procStruct->prorettype;
508  if (IsPolymorphicType(rettypeid))
509  {
510  if (forValidator)
511  {
512  if (rettypeid == ANYARRAYOID ||
513  rettypeid == ANYCOMPATIBLEARRAYOID)
514  rettypeid = INT4ARRAYOID;
515  else if (rettypeid == ANYRANGEOID ||
516  rettypeid == ANYCOMPATIBLERANGEOID)
517  rettypeid = INT4RANGEOID;
518  else if (rettypeid == ANYMULTIRANGEOID)
519  rettypeid = INT4MULTIRANGEOID;
520  else /* ANYELEMENT or ANYNONARRAY or ANYCOMPATIBLE */
521  rettypeid = INT4OID;
522  /* XXX what could we use for ANYENUM? */
523  }
524  else
525  {
526  rettypeid = get_fn_expr_rettype(fcinfo->flinfo);
527  if (!OidIsValid(rettypeid))
528  ereport(ERROR,
529  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
530  errmsg("could not determine actual return type "
531  "for polymorphic function \"%s\"",
532  plpgsql_error_funcname)));
533  }
534  }
535 
536  /*
537  * Normal function has a defined returntype
538  */
539  function->fn_rettype = rettypeid;
540  function->fn_retset = procStruct->proretset;
541 
542  /*
543  * Lookup the function's return type
544  */
545  typeTup = SearchSysCache1(TYPEOID, ObjectIdGetDatum(rettypeid));
546  if (!HeapTupleIsValid(typeTup))
547  elog(ERROR, "cache lookup failed for type %u", rettypeid);
548  typeStruct = (Form_pg_type) GETSTRUCT(typeTup);
549 
550  /* Disallow pseudotype result, except VOID or RECORD */
551  /* (note we already replaced polymorphic types) */
552  if (typeStruct->typtype == TYPTYPE_PSEUDO)
553  {
554  if (rettypeid == VOIDOID ||
555  rettypeid == RECORDOID)
556  /* okay */ ;
557  else if (rettypeid == TRIGGEROID || rettypeid == EVENT_TRIGGEROID)
558  ereport(ERROR,
559  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
560  errmsg("trigger functions can only be called as triggers")));
561  else
562  ereport(ERROR,
563  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
564  errmsg("PL/pgSQL functions cannot return type %s",
565  format_type_be(rettypeid))));
566  }
567 
568  function->fn_retistuple = type_is_rowtype(rettypeid);
569  function->fn_retisdomain = (typeStruct->typtype == TYPTYPE_DOMAIN);
570  function->fn_retbyval = typeStruct->typbyval;
571  function->fn_rettyplen = typeStruct->typlen;
572 
573  /*
574  * install $0 reference, but only for polymorphic return types,
575  * and not when the return is specified through an output
576  * parameter.
577  */
578  if (IsPolymorphicType(procStruct->prorettype) &&
579  num_out_args == 0)
580  {
581  (void) plpgsql_build_variable("$0", 0,
582  build_datatype(typeTup,
583  -1,
584  function->fn_input_collation,
585  NULL),
586  true);
587  }
588 
589  ReleaseSysCache(typeTup);
590  break;
591 
592  case PLPGSQL_DML_TRIGGER:
593  /* Trigger procedure's return type is unknown yet */
594  function->fn_rettype = InvalidOid;
595  function->fn_retbyval = false;
596  function->fn_retistuple = true;
597  function->fn_retisdomain = false;
598  function->fn_retset = false;
599 
600  /* shouldn't be any declared arguments */
601  if (procStruct->pronargs != 0)
602  ereport(ERROR,
603  (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
604  errmsg("trigger functions cannot have declared arguments"),
605  errhint("The arguments of the trigger can be accessed through TG_NARGS and TG_ARGV instead.")));
606 
607  /* Add the record for referencing NEW ROW */
608  rec = plpgsql_build_record("new", 0, NULL, RECORDOID, true);
609  function->new_varno = rec->dno;
610 
611  /* Add the record for referencing OLD ROW */
612  rec = plpgsql_build_record("old", 0, NULL, RECORDOID, true);
613  function->old_varno = rec->dno;
614 
615  /* Add the variable tg_name */
616  var = plpgsql_build_variable("tg_name", 0,
617  plpgsql_build_datatype(NAMEOID,
618  -1,
619  function->fn_input_collation,
620  NULL),
621  true);
622  Assert(var->dtype == PLPGSQL_DTYPE_VAR);
623  var->dtype = PLPGSQL_DTYPE_PROMISE;
624  ((PLpgSQL_var *) var)->promise = PLPGSQL_PROMISE_TG_NAME;
625 
626  /* Add the variable tg_when */
627  var = plpgsql_build_variable("tg_when", 0,
628  plpgsql_build_datatype(TEXTOID,
629  -1,
630  function->fn_input_collation,
631  NULL),
632  true);
633  Assert(var->dtype == PLPGSQL_DTYPE_VAR);
634  var->dtype = PLPGSQL_DTYPE_PROMISE;
635  ((PLpgSQL_var *) var)->promise = PLPGSQL_PROMISE_TG_WHEN;
636 
637  /* Add the variable tg_level */
638  var = plpgsql_build_variable("tg_level", 0,
639  plpgsql_build_datatype(TEXTOID,
640  -1,
641  function->fn_input_collation,
642  NULL),
643  true);
644  Assert(var->dtype == PLPGSQL_DTYPE_VAR);
645  var->dtype = PLPGSQL_DTYPE_PROMISE;
646  ((PLpgSQL_var *) var)->promise = PLPGSQL_PROMISE_TG_LEVEL;
647 
648  /* Add the variable tg_op */
649  var = plpgsql_build_variable("tg_op", 0,
650  plpgsql_build_datatype(TEXTOID,
651  -1,
652  function->fn_input_collation,
653  NULL),
654  true);
655  Assert(var->dtype == PLPGSQL_DTYPE_VAR);
656  var->dtype = PLPGSQL_DTYPE_PROMISE;
657  ((PLpgSQL_var *) var)->promise = PLPGSQL_PROMISE_TG_OP;
658 
659  /* Add the variable tg_relid */
660  var = plpgsql_build_variable("tg_relid", 0,
661  plpgsql_build_datatype(OIDOID,
662  -1,
663  InvalidOid,
664  NULL),
665  true);
666  Assert(var->dtype == PLPGSQL_DTYPE_VAR);
667  var->dtype = PLPGSQL_DTYPE_PROMISE;
668  ((PLpgSQL_var *) var)->promise = PLPGSQL_PROMISE_TG_RELID;
669 
670  /* Add the variable tg_relname */
671  var = plpgsql_build_variable("tg_relname", 0,
672  plpgsql_build_datatype(NAMEOID,
673  -1,
674  function->fn_input_collation,
675  NULL),
676  true);
677  Assert(var->dtype == PLPGSQL_DTYPE_VAR);
678  var->dtype = PLPGSQL_DTYPE_PROMISE;
679  ((PLpgSQL_var *) var)->promise = PLPGSQL_PROMISE_TG_TABLE_NAME;
680 
681  /* tg_table_name is now preferred to tg_relname */
682  var = plpgsql_build_variable("tg_table_name", 0,
683  plpgsql_build_datatype(NAMEOID,
684  -1,
685  function->fn_input_collation,
686  NULL),
687  true);
688  Assert(var->dtype == PLPGSQL_DTYPE_VAR);
689  var->dtype = PLPGSQL_DTYPE_PROMISE;
690  ((PLpgSQL_var *) var)->promise = PLPGSQL_PROMISE_TG_TABLE_NAME;
691 
692  /* add the variable tg_table_schema */
693  var = plpgsql_build_variable("tg_table_schema", 0,
694  plpgsql_build_datatype(NAMEOID,
695  -1,
696  function->fn_input_collation,
697  NULL),
698  true);
699  Assert(var->dtype == PLPGSQL_DTYPE_VAR);
700  var->dtype = PLPGSQL_DTYPE_PROMISE;
701  ((PLpgSQL_var *) var)->promise = PLPGSQL_PROMISE_TG_TABLE_SCHEMA;
702 
703  /* Add the variable tg_nargs */
704  var = plpgsql_build_variable("tg_nargs", 0,
705  plpgsql_build_datatype(INT4OID,
706  -1,
707  InvalidOid,
708  NULL),
709  true);
710  Assert(var->dtype == PLPGSQL_DTYPE_VAR);
711  var->dtype = PLPGSQL_DTYPE_PROMISE;
712  ((PLpgSQL_var *) var)->promise = PLPGSQL_PROMISE_TG_NARGS;
713 
714  /* Add the variable tg_argv */
715  var = plpgsql_build_variable("tg_argv", 0,
716  plpgsql_build_datatype(TEXTARRAYOID,
717  -1,
718  function->fn_input_collation,
719  NULL),
720  true);
721  Assert(var->dtype == PLPGSQL_DTYPE_VAR);
722  var->dtype = PLPGSQL_DTYPE_PROMISE;
723  ((PLpgSQL_var *) var)->promise = PLPGSQL_PROMISE_TG_ARGV;
724 
725  break;
726 
727  case PLPGSQL_EVENT_TRIGGER:
728  function->fn_rettype = VOIDOID;
729  function->fn_retbyval = false;
730  function->fn_retistuple = true;
731  function->fn_retisdomain = false;
732  function->fn_retset = false;
733 
734  /* shouldn't be any declared arguments */
735  if (procStruct->pronargs != 0)
736  ereport(ERROR,
737  (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
738  errmsg("event trigger functions cannot have declared arguments")));
739 
740  /* Add the variable tg_event */
741  var = plpgsql_build_variable("tg_event", 0,
742  plpgsql_build_datatype(TEXTOID,
743  -1,
744  function->fn_input_collation,
745  NULL),
746  true);
747  Assert(var->dtype == PLPGSQL_DTYPE_VAR);
748  var->dtype = PLPGSQL_DTYPE_PROMISE;
749  ((PLpgSQL_var *) var)->promise = PLPGSQL_PROMISE_TG_EVENT;
750 
751  /* Add the variable tg_tag */
752  var = plpgsql_build_variable("tg_tag", 0,
753  plpgsql_build_datatype(TEXTOID,
754  -1,
755  function->fn_input_collation,
756  NULL),
757  true);
758  Assert(var->dtype == PLPGSQL_DTYPE_VAR);
759  var->dtype = PLPGSQL_DTYPE_PROMISE;
760  ((PLpgSQL_var *) var)->promise = PLPGSQL_PROMISE_TG_TAG;
761 
762  break;
763 
764  default:
765  elog(ERROR, "unrecognized function typecode: %d",
766  (int) function->fn_is_trigger);
767  break;
768  }
769 
770  /* Remember if function is STABLE/IMMUTABLE */
771  function->fn_readonly = (procStruct->provolatile != PROVOLATILE_VOLATILE);
772 
773  /*
774  * Create the magic FOUND variable.
775  */
776  var = plpgsql_build_variable("found", 0,
777  plpgsql_build_datatype(BOOLOID,
778  -1,
779  InvalidOid,
780  NULL),
781  true);
782  function->found_varno = var->dno;
783 
784  /*
785  * Now parse the function's text
786  */
787  parse_rc = plpgsql_yyparse();
788  if (parse_rc != 0)
789  elog(ERROR, "plpgsql parser returned %d", parse_rc);
790  function->action = plpgsql_parse_result;
791 
792  plpgsql_scanner_finish();
793  pfree(proc_source);
794 
795  /*
796  * If it has OUT parameters or returns VOID or returns a set, we allow
797  * control to fall off the end without an explicit RETURN statement. The
798  * easiest way to implement this is to add a RETURN statement to the end
799  * of the statement list during parsing.
800  */
801  if (num_out_args > 0 || function->fn_rettype == VOIDOID ||
802  function->fn_retset)
803  add_dummy_return(function);
804 
805  /*
806  * Complete the function's info
807  */
808  function->fn_nargs = procStruct->pronargs;
809  for (i = 0; i < function->fn_nargs; i++)
810  function->fn_argvarnos[i] = in_arg_varnos[i];
811 
812  plpgsql_finish_datums(function);
813 
814  /* Debug dump for completed functions */
815  if (plpgsql_DumpExecTree)
816  plpgsql_dumptree(function);
817 
818  /*
819  * add it to the hash table
820  */
821  plpgsql_HashTableInsert(function, hashkey);
822 
823  /*
824  * Pop the error context stack
825  */
826  error_context_stack = plerrcontext.previous;
827  plpgsql_error_funcname = NULL;
828 
829  plpgsql_check_syntax = false;
830 
831  MemoryContextSwitchTo(plpgsql_compile_tmp_cxt);
832  plpgsql_compile_tmp_cxt = NULL;
833  return function;
834 }
835 
836 /* ----------
837  * plpgsql_compile_inline Make an execution tree for an anonymous code block.
838  *
839  * Note: this is generally parallel to do_compile(); is it worth trying to
840  * merge the two?
841  *
842  * Note: we assume the block will be thrown away so there is no need to build
843  * persistent data structures.
844  * ----------
845  */
846 PLpgSQL_function *
847 plpgsql_compile_inline(char *proc_source)
848 {
849  char *func_name = "inline_code_block";
850  PLpgSQL_function *function;
851  ErrorContextCallback plerrcontext;
852  PLpgSQL_variable *var;
853  int parse_rc;
854  MemoryContext func_cxt;
855 
856  /*
857  * Setup the scanner input and error info. We assume that this function
858  * cannot be invoked recursively, so there's no need to save and restore
859  * the static variables used here.
860  */
861  plpgsql_scanner_init(proc_source);
862 
863  plpgsql_error_funcname = func_name;
864 
865  /*
866  * Setup error traceback support for ereport()
867  */
868  plerrcontext.callback = plpgsql_compile_error_callback;
869  plerrcontext.arg = proc_source;
870  plerrcontext.previous = error_context_stack;
871  error_context_stack = &plerrcontext;
872 
873  /* Do extra syntax checking if check_function_bodies is on */
874  plpgsql_check_syntax = check_function_bodies;
875 
876  /* Function struct does not live past current statement */
877  function = (PLpgSQL_function *) palloc0(sizeof(PLpgSQL_function));
878 
879  plpgsql_curr_compile = function;
880 
881  /*
882  * All the rest of the compile-time storage (e.g. parse tree) is kept in
883  * its own memory context, so it can be reclaimed easily.
884  */
885  func_cxt = AllocSetContextCreate(CurrentMemoryContext,
886  "PL/pgSQL inline code context",
887  ALLOCSET_DEFAULT_SIZES);
888  plpgsql_compile_tmp_cxt = MemoryContextSwitchTo(func_cxt);
889 
890  function->fn_signature = pstrdup(func_name);
891  function->fn_is_trigger = PLPGSQL_NOT_TRIGGER;
892  function->fn_input_collation = InvalidOid;
893  function->fn_cxt = func_cxt;
894  function->out_param_varno = -1; /* set up for no OUT param */
895  function->resolve_option = plpgsql_variable_conflict;
896  function->print_strict_params = plpgsql_print_strict_params;
897 
898  /*
899  * don't do extra validation for inline code as we don't want to add spam
900  * at runtime
901  */
902  function->extra_warnings = 0;
903  function->extra_errors = 0;
904 
905  function->nstatements = 0;
906  function->requires_procedure_resowner = false;
907 
908  plpgsql_ns_init();
909  plpgsql_ns_push(func_name, PLPGSQL_LABEL_BLOCK);
910  plpgsql_DumpExecTree = false;
911  plpgsql_start_datums();
912 
913  /* Set up as though in a function returning VOID */
914  function->fn_rettype = VOIDOID;
915  function->fn_retset = false;
916  function->fn_retistuple = false;
917  function->fn_retisdomain = false;
918  function->fn_prokind = PROKIND_FUNCTION;
919  /* a bit of hardwired knowledge about type VOID here */
920  function->fn_retbyval = true;
921  function->fn_rettyplen = sizeof(int32);
922 
923  /*
924  * Remember if function is STABLE/IMMUTABLE. XXX would it be better to
925  * set this true inside a read-only transaction? Not clear.
926  */
927  function->fn_readonly = false;
928 
929  /*
930  * Create the magic FOUND variable.
931  */
932  var = plpgsql_build_variable("found", 0,
933  plpgsql_build_datatype(BOOLOID,
934  -1,
935  InvalidOid,
936  NULL),
937  true);
938  function->found_varno = var->dno;
939 
940  /*
941  * Now parse the function's text
942  */
943  parse_rc = plpgsql_yyparse();
944  if (parse_rc != 0)
945  elog(ERROR, "plpgsql parser returned %d", parse_rc);
946  function->action = plpgsql_parse_result;
947 
948  plpgsql_scanner_finish();
949 
950  /*
951  * If it returns VOID (always true at the moment), we allow control to
952  * fall off the end without an explicit RETURN statement.
953  */
954  if (function->fn_rettype == VOIDOID)
955  add_dummy_return(function);
956 
957  /*
958  * Complete the function's info
959  */
960  function->fn_nargs = 0;
961 
962  plpgsql_finish_datums(function);
963 
964  /*
965  * Pop the error context stack
966  */
967  error_context_stack = plerrcontext.previous;
968  plpgsql_error_funcname = NULL;
969 
970  plpgsql_check_syntax = false;
971 
972  MemoryContextSwitchTo(plpgsql_compile_tmp_cxt);
973  plpgsql_compile_tmp_cxt = NULL;
974  return function;
975 }
976 
977 
978 /*
979  * error context callback to let us supply a call-stack traceback.
980  * If we are validating or executing an anonymous code block, the function
981  * source text is passed as an argument.
982  */
983 static void
984 plpgsql_compile_error_callback(void *arg)
985 {
986  if (arg)
987  {
988  /*
989  * Try to convert syntax error position to reference text of original
990  * CREATE FUNCTION or DO command.
991  */
992  if (function_parse_error_transpose((const char *) arg))
993  return;
994 
995  /*
996  * Done if a syntax error position was reported; otherwise we have to
997  * fall back to a "near line N" report.
998  */
999  }
1000 
1001  if (plpgsql_error_funcname)
1002  errcontext("compilation of PL/pgSQL function \"%s\" near line %d",
1003  plpgsql_error_funcname, plpgsql_latest_lineno());
1004 }
1005 
1006 
1007 /*
1008  * Add a name for a function parameter to the function's namespace
1009  */
1010 static void
1011 add_parameter_name(PLpgSQL_nsitem_type itemtype, int itemno, const char *name)
1012 {
1013  /*
1014  * Before adding the name, check for duplicates. We need this even though
1015  * functioncmds.c has a similar check, because that code explicitly
1016  * doesn't complain about conflicting IN and OUT parameter names. In
1017  * plpgsql, such names are in the same namespace, so there is no way to
1018  * disambiguate.
1019  */
1020  if (plpgsql_ns_lookup(plpgsql_ns_top(), true,
1021  name, NULL, NULL,
1022  NULL) != NULL)
1023  ereport(ERROR,
1024  (errcode(ERRCODE_INVALID_FUNCTION_DEFINITION),
1025  errmsg("parameter name \"%s\" used more than once",
1026  name)));
1027 
1028  /* OK, add the name */
1029  plpgsql_ns_additem(itemtype, itemno, name);
1030 }
1031 
1032 /*
1033  * Add a dummy RETURN statement to the given function's body
1034  */
1035 static void
1036 add_dummy_return(PLpgSQL_function *function)
1037 {
1038  /*
1039  * If the outer block has an EXCEPTION clause, we need to make a new outer
1040  * block, since the added RETURN shouldn't act like it is inside the
1041  * EXCEPTION clause. Likewise, if it has a label, wrap it in a new outer
1042  * block so that EXIT doesn't skip the RETURN.
1043  */
1044  if (function->action->exceptions != NULL ||
1045  function->action->label != NULL)
1046  {
1047  PLpgSQL_stmt_block *new;
1048 
1049  new = palloc0(sizeof(PLpgSQL_stmt_block));
1050  new->cmd_type = PLPGSQL_STMT_BLOCK;
1051  new->stmtid = ++function->nstatements;
1052  new->body = list_make1(function->action);
1053 
1054  function->action = new;
1055  }
1056  if (function->action->body == NIL ||
1057  ((PLpgSQL_stmt *) llast(function->action->body))->cmd_type != PLPGSQL_STMT_RETURN)
1058  {
1059  PLpgSQL_stmt_return *new;
1060 
1061  new = palloc0(sizeof(PLpgSQL_stmt_return));
1062  new->cmd_type = PLPGSQL_STMT_RETURN;
1063  new->stmtid = ++function->nstatements;
1064  new->expr = NULL;
1065  new->retvarno = function->out_param_varno;
1066 
1067  function->action->body = lappend(function->action->body, new);
1068  }
1069 }
1070 
1071 
1072 /*
1073  * plpgsql_parser_setup set up parser hooks for dynamic parameters
1074  *
1075  * Note: this routine, and the hook functions it prepares for, are logically
1076  * part of plpgsql parsing. But they actually run during function execution,
1077  * when we are ready to evaluate a SQL query or expression that has not
1078  * previously been parsed and planned.
1079  */
1080 void
1081 plpgsql_parser_setup(struct ParseState *pstate, PLpgSQL_expr *expr)
1082 {
1083  pstate->p_pre_columnref_hook = plpgsql_pre_column_ref;
1084  pstate->p_post_columnref_hook = plpgsql_post_column_ref;
1085  pstate->p_paramref_hook = plpgsql_param_ref;
1086  /* no need to use p_coerce_param_hook */
1087  pstate->p_ref_hook_state = (void *) expr;
1088 }
1089 
1090 /*
1091  * plpgsql_pre_column_ref parser callback before parsing a ColumnRef
1092  */
1093 static Node *
1094 plpgsql_pre_column_ref(ParseState *pstate, ColumnRef *cref)
1095 {
1096  PLpgSQL_expr *expr = (PLpgSQL_expr *) pstate->p_ref_hook_state;
1097 
1098  if (expr->func->resolve_option == PLPGSQL_RESOLVE_VARIABLE)
1099  return resolve_column_ref(pstate, expr, cref, false);
1100  else
1101  return NULL;
1102 }
1103 
1104 /*
1105  * plpgsql_post_column_ref parser callback after parsing a ColumnRef
1106  */
1107 static Node *
1108 plpgsql_post_column_ref(ParseState *pstate, ColumnRef *cref, Node *var)
1109 {
1110  PLpgSQL_expr *expr = (PLpgSQL_expr *) pstate->p_ref_hook_state;
1111  Node *myvar;
1112 
1113  if (expr->func->resolve_option == PLPGSQL_RESOLVE_VARIABLE)
1114  return NULL; /* we already found there's no match */
1115 
1116  if (expr->func->resolve_option == PLPGSQL_RESOLVE_COLUMN && var != NULL)
1117  return NULL; /* there's a table column, prefer that */
1118 
1119  /*
1120  * If we find a record/row variable but can't match a field name, throw
1121  * error if there was no core resolution for the ColumnRef either. In
1122  * that situation, the reference is inevitably going to fail, and
1123  * complaining about the record/row variable is likely to be more on-point
1124  * than the core parser's error message. (It's too bad we don't have
1125  * access to transformColumnRef's internal crerr state here, as in case of
1126  * a conflict with a table name this could still be less than the most
1127  * helpful error message possible.)
1128  */
1129  myvar = resolve_column_ref(pstate, expr, cref, (var == NULL));
1130 
1131  if (myvar != NULL && var != NULL)
1132  {
1133  /*
1134  * We could leave it to the core parser to throw this error, but we
1135  * can add a more useful detail message than the core could.
1136  */
1137  ereport(ERROR,
1138  (errcode(ERRCODE_AMBIGUOUS_COLUMN),
1139  errmsg("column reference \"%s\" is ambiguous",
1140  NameListToString(cref->fields)),
1141  errdetail("It could refer to either a PL/pgSQL variable or a table column."),
1142  parser_errposition(pstate, cref->location)));
1143  }
1144 
1145  return myvar;
1146 }
1147 
1148 /*
1149  * plpgsql_param_ref parser callback for ParamRefs ($n symbols)
1150  */
1151 static Node *
1152 plpgsql_param_ref(ParseState *pstate, ParamRef *pref)
1153 {
1154  PLpgSQL_expr *expr = (PLpgSQL_expr *) pstate->p_ref_hook_state;
1155  char pname[32];
1156  PLpgSQL_nsitem *nse;
1157 
1158  snprintf(pname, sizeof(pname), "$%d", pref->number);
1159 
1160  nse = plpgsql_ns_lookup(expr->ns, false,
1161  pname, NULL, NULL,
1162  NULL);
1163 
1164  if (nse == NULL)
1165  return NULL; /* name not known to plpgsql */
1166 
1167  return make_datum_param(expr, nse->itemno, pref->location);
1168 }
1169 
1170 /*
1171  * resolve_column_ref attempt to resolve a ColumnRef as a plpgsql var
1172  *
1173  * Returns the translated node structure, or NULL if name not found
1174  *
1175  * error_if_no_field tells whether to throw error or quietly return NULL if
1176  * we are able to match a record/row name but don't find a field name match.
1177  */
1178 static Node *
1179 resolve_column_ref(ParseState *pstate, PLpgSQL_expr *expr,
1180  ColumnRef *cref, bool error_if_no_field)
1181 {
1182  PLpgSQL_execstate *estate;
1183  PLpgSQL_nsitem *nse;
1184  const char *name1;
1185  const char *name2 = NULL;
1186  const char *name3 = NULL;
1187  const char *colname = NULL;
1188  int nnames;
1189  int nnames_scalar = 0;
1190  int nnames_wholerow = 0;
1191  int nnames_field = 0;
1192 
1193  /*
1194  * We use the function's current estate to resolve parameter data types.
1195  * This is really pretty bogus because there is no provision for updating
1196  * plans when those types change ...
1197  */
1198  estate = expr->func->cur_estate;
1199 
1200  /*----------
1201  * The allowed syntaxes are:
1202  *
1203  * A Scalar variable reference, or whole-row record reference.
1204  * A.B Qualified scalar or whole-row reference, or field reference.
1205  * A.B.C Qualified record field reference.
1206  * A.* Whole-row record reference.
1207  * A.B.* Qualified whole-row record reference.
1208  *----------
1209  */
1210  switch (list_length(cref->fields))
1211  {
1212  case 1:
1213  {
1214  Node *field1 = (Node *) linitial(cref->fields);
1215 
1216  name1 = strVal(field1);
1217  nnames_scalar = 1;
1218  nnames_wholerow = 1;
1219  break;
1220  }
1221  case 2:
1222  {
1223  Node *field1 = (Node *) linitial(cref->fields);
1224  Node *field2 = (Node *) lsecond(cref->fields);
1225 
1226  name1 = strVal(field1);
1227 
1228  /* Whole-row reference? */
1229  if (IsA(field2, A_Star))
1230  {
1231  /* Set name2 to prevent matches to scalar variables */
1232  name2 = "*";
1233  nnames_wholerow = 1;
1234  break;
1235  }
1236 
1237  name2 = strVal(field2);
1238  colname = name2;
1239  nnames_scalar = 2;
1240  nnames_wholerow = 2;
1241  nnames_field = 1;
1242  break;
1243  }
1244  case 3:
1245  {
1246  Node *field1 = (Node *) linitial(cref->fields);
1247  Node *field2 = (Node *) lsecond(cref->fields);
1248  Node *field3 = (Node *) lthird(cref->fields);
1249 
1250  name1 = strVal(field1);
1251  name2 = strVal(field2);
1252 
1253  /* Whole-row reference? */
1254  if (IsA(field3, A_Star))
1255  {
1256  /* Set name3 to prevent matches to scalar variables */
1257  name3 = "*";
1258  nnames_wholerow = 2;
1259  break;
1260  }
1261 
1262  name3 = strVal(field3);
1263  colname = name3;
1264  nnames_field = 2;
1265  break;
1266  }
1267  default:
1268  /* too many names, ignore */
1269  return NULL;
1270  }
1271 
1272  nse = plpgsql_ns_lookup(expr->ns, false,
1273  name1, name2, name3,
1274  &nnames);
1275 
1276  if (nse == NULL)
1277  return NULL; /* name not known to plpgsql */
1278 
1279  switch (nse->itemtype)
1280  {
1281  case PLPGSQL_NSTYPE_VAR:
1282  if (nnames == nnames_scalar)
1283  return make_datum_param(expr, nse->itemno, cref->location);
1284  break;
1285  case PLPGSQL_NSTYPE_REC:
1286  if (nnames == nnames_wholerow)
1287  return make_datum_param(expr, nse->itemno, cref->location);
1288  if (nnames == nnames_field)
1289  {
1290  /* colname could be a field in this record */
1291  PLpgSQL_rec *rec = (PLpgSQL_rec *) estate->datums[nse->itemno];
1292  int i;
1293 
1294  /* search for a datum referencing this field */
1295  i = rec->firstfield;
1296  while (i >= 0)
1297  {
1298  PLpgSQL_recfield *fld = (PLpgSQL_recfield *) estate->datums[i];
1299 
1300  Assert(fld->dtype == PLPGSQL_DTYPE_RECFIELD &&
1301  fld->recparentno == nse->itemno);
1302  if (strcmp(fld->fieldname, colname) == 0)
1303  {
1304  return make_datum_param(expr, i, cref->location);
1305  }
1306  i = fld->nextfield;
1307  }
1308 
1309  /*
1310  * We should not get here, because a RECFIELD datum should
1311  * have been built at parse time for every possible qualified
1312  * reference to fields of this record. But if we do, handle
1313  * it like field-not-found: throw error or return NULL.
1314  */
1315  if (error_if_no_field)
1316  ereport(ERROR,
1317  (errcode(ERRCODE_UNDEFINED_COLUMN),
1318  errmsg("record \"%s\" has no field \"%s\"",
1319  (nnames_field == 1) ? name1 : name2,
1320  colname),
1321  parser_errposition(pstate, cref->location)));
1322  }
1323  break;
1324  default:
1325  elog(ERROR, "unrecognized plpgsql itemtype: %d", nse->itemtype);
1326  }
1327 
1328  /* Name format doesn't match the plpgsql variable type */
1329  return NULL;
1330 }
1331 
1332 /*
1333  * Helper for columnref parsing: build a Param referencing a plpgsql datum,
1334  * and make sure that that datum is listed in the expression's paramnos.
1335  */
1336 static Node *
1337 make_datum_param(PLpgSQL_expr *expr, int dno, int location)
1338 {
1339  PLpgSQL_execstate *estate;
1340  PLpgSQL_datum *datum;
1341  Param *param;
1342  MemoryContext oldcontext;
1343 
1344  /* see comment in resolve_column_ref */
1345  estate = expr->func->cur_estate;
1346  Assert(dno >= 0 && dno < estate->ndatums);
1347  datum = estate->datums[dno];
1348 
1349  /*
1350  * Bitmapset must be allocated in function's permanent memory context
1351  */
1352  oldcontext = MemoryContextSwitchTo(expr->func->fn_cxt);
1353  expr->paramnos = bms_add_member(expr->paramnos, dno);
1354  MemoryContextSwitchTo(oldcontext);
1355 
1356  param = makeNode(Param);
1357  param->paramkind = PARAM_EXTERN;
1358  param->paramid = dno + 1;
1359  plpgsql_exec_get_datum_type_info(estate,
1360  datum,
1361  &param->paramtype,
1362  &param->paramtypmod,
1363  &param->paramcollid);
1364  param->location = location;
1365 
1366  return (Node *) param;
1367 }
1368 
1369 
1370 /* ----------
1371  * plpgsql_parse_word The scanner calls this to postparse
1372  * any single word that is not a reserved keyword.
1373  *
1374  * word1 is the downcased/dequoted identifier; it must be palloc'd in the
1375  * function's long-term memory context.
1376  *
1377  * yytxt is the original token text; we need this to check for quoting,
1378  * so that later checks for unreserved keywords work properly.
1379  *
1380  * We attempt to recognize the token as a variable only if lookup is true
1381  * and the plpgsql_IdentifierLookup context permits it.
1382  *
1383  * If recognized as a variable, fill in *wdatum and return true;
1384  * if not recognized, fill in *word and return false.
1385  * (Note: those two pointers actually point to members of the same union,
1386  * but for notational reasons we pass them separately.)
1387  * ----------
1388  */
1389 bool
1390 plpgsql_parse_word(char *word1, const char *yytxt, bool lookup,
1391  PLwdatum *wdatum, PLword *word)
1392 {
1393  PLpgSQL_nsitem *ns;
1394 
1395  /*
1396  * We should not lookup variables in DECLARE sections. In SQL
1397  * expressions, there's no need to do so either --- lookup will happen
1398  * when the expression is compiled.
1399  */
1400  if (lookup && plpgsql_IdentifierLookup == IDENTIFIER_LOOKUP_NORMAL)
1401  {
1402  /*
1403  * Do a lookup in the current namespace stack
1404  */
1405  ns = plpgsql_ns_lookup(plpgsql_ns_top(), false,
1406  word1, NULL, NULL,
1407  NULL);
1408 
1409  if (ns != NULL)
1410  {
1411  switch (ns->itemtype)
1412  {
1413  case PLPGSQL_NSTYPE_VAR:
1414  case PLPGSQL_NSTYPE_REC:
1415  wdatum->datum = plpgsql_Datums[ns->itemno];
1416  wdatum->ident = word1;
1417  wdatum->quoted = (yytxt[0] == '"');
1418  wdatum->idents = NIL;
1419  return true;
1420 
1421  default:
1422  /* plpgsql_ns_lookup should never return anything else */
1423  elog(ERROR, "unrecognized plpgsql itemtype: %d",
1424  ns->itemtype);
1425  }
1426  }
1427  }
1428 
1429  /*
1430  * Nothing found - up to now it's a word without any special meaning for
1431  * us.
1432  */
1433  word->ident = word1;
1434  word->quoted = (yytxt[0] == '"');
1435  return false;
1436 }
1437 
1438 
1439 /* ----------
1440  * plpgsql_parse_dblword Same lookup for two words
1441  * separated by a dot.
1442  * ----------
1443  */
1444 bool
1445 plpgsql_parse_dblword(char *word1, char *word2,
1446  PLwdatum *wdatum, PLcword *cword)
1447 {
1448  PLpgSQL_nsitem *ns;
1449  List *idents;
1450  int nnames;
1451 
1452  idents = list_make2(makeString(word1),
1453  makeString(word2));
1454 
1455  /*
1456  * We should do nothing in DECLARE sections. In SQL expressions, we
1457  * really only need to make sure that RECFIELD datums are created when
1458  * needed. In all the cases handled by this function, returning a T_DATUM
1459  * with a two-word idents string is the right thing.
1460  */
1461  if (plpgsql_IdentifierLookup != IDENTIFIER_LOOKUP_DECLARE)
1462  {
1463  /*
1464  * Do a lookup in the current namespace stack
1465  */
1466  ns = plpgsql_ns_lookup(plpgsql_ns_top(), false,
1467  word1, word2, NULL,
1468  &nnames);
1469  if (ns != NULL)
1470  {
1471  switch (ns->itemtype)
1472  {
1473  case PLPGSQL_NSTYPE_VAR:
1474  /* Block-qualified reference to scalar variable. */
1475  wdatum->datum = plpgsql_Datums[ns->itemno];
1476  wdatum->ident = NULL;
1477  wdatum->quoted = false; /* not used */
1478  wdatum->idents = idents;
1479  return true;
1480 
1481  case PLPGSQL_NSTYPE_REC:
1482  if (nnames == 1)
1483  {
1484  /*
1485  * First word is a record name, so second word could
1486  * be a field in this record. We build a RECFIELD
1487  * datum whether it is or not --- any error will be
1488  * detected later.
1489  */
1490  PLpgSQL_rec *rec;
1491  PLpgSQL_recfield *new;
1492 
1493  rec = (PLpgSQL_rec *) (plpgsql_Datums[ns->itemno]);
1494  new = plpgsql_build_recfield(rec, word2);
1495 
1496  wdatum->datum = (PLpgSQL_datum *) new;
1497  }
1498  else
1499  {
1500  /* Block-qualified reference to record variable. */
1501  wdatum->datum = plpgsql_Datums[ns->itemno];
1502  }
1503  wdatum->ident = NULL;
1504  wdatum->quoted = false; /* not used */
1505  wdatum->idents = idents;
1506  return true;
1507 
1508  default:
1509  break;
1510  }
1511  }
1512  }
1513 
1514  /* Nothing found */
1515  cword->idents = idents;
1516  return false;
1517 }
1518 
1519 
1520 /* ----------
1521  * plpgsql_parse_tripword Same lookup for three words
1522  * separated by dots.
1523  * ----------
1524  */
1525 bool
1526 plpgsql_parse_tripword(char *word1, char *word2, char *word3,
1527  PLwdatum *wdatum, PLcword *cword)
1528 {
1529  PLpgSQL_nsitem *ns;
1530  List *idents;
1531  int nnames;
1532 
1533  /*
1534  * We should do nothing in DECLARE sections. In SQL expressions, we need
1535  * to make sure that RECFIELD datums are created when needed, and we need
1536  * to be careful about how many names are reported as belonging to the
1537  * T_DATUM: the third word could be a sub-field reference, which we don't
1538  * care about here.
1539  */
1540  if (plpgsql_IdentifierLookup != IDENTIFIER_LOOKUP_DECLARE)
1541  {
1542  /*
1543  * Do a lookup in the current namespace stack. Must find a record
1544  * reference, else ignore.
1545  */
1546  ns = plpgsql_ns_lookup(plpgsql_ns_top(), false,
1547  word1, word2, word3,
1548  &nnames);
1549  if (ns != NULL)
1550  {
1551  switch (ns->itemtype)
1552  {
1553  case PLPGSQL_NSTYPE_REC:
1554  {
1555  PLpgSQL_rec *rec;
1556  PLpgSQL_recfield *new;
1557 
1558  rec = (PLpgSQL_rec *) (plpgsql_Datums[ns->itemno]);
1559  if (nnames == 1)
1560  {
1561  /*
1562  * First word is a record name, so second word
1563  * could be a field in this record (and the third,
1564  * a sub-field). We build a RECFIELD datum
1565  * whether it is or not --- any error will be
1566  * detected later.
1567  */
1568  new = plpgsql_build_recfield(rec, word2);
1569  idents = list_make2(makeString(word1),
1570  makeString(word2));
1571  }
1572  else
1573  {
1574  /* Block-qualified reference to record variable. */
1575  new = plpgsql_build_recfield(rec, word3);
1576  idents = list_make3(makeString(word1),
1577  makeString(word2),
1578  makeString(word3));
1579  }
1580  wdatum->datum = (PLpgSQL_datum *) new;
1581  wdatum->ident = NULL;
1582  wdatum->quoted = false; /* not used */
1583  wdatum->idents = idents;
1584  return true;
1585  }
1586 
1587  default:
1588  break;
1589  }
1590  }
1591  }
1592 
1593  /* Nothing found */
1594  idents = list_make3(makeString(word1),
1595  makeString(word2),
1596  makeString(word3));
1597  cword->idents = idents;
1598  return false;
1599 }
1600 
1601 
1602 /* ----------
1603  * plpgsql_parse_wordtype The scanner found word%TYPE. word can be
1604  * a variable name or a basetype.
1605  *
1606  * Returns datatype struct, or NULL if no match found for word.
1607  * ----------
1608  */
1609 PLpgSQL_type *
1610 plpgsql_parse_wordtype(char *ident)
1611 {
1612  PLpgSQL_type *dtype;
1613  PLpgSQL_nsitem *nse;
1614  TypeName *typeName;
1615  HeapTuple typeTup;
1616 
1617  /*
1618  * Do a lookup in the current namespace stack
1619  */
1620  nse = plpgsql_ns_lookup(plpgsql_ns_top(), false,
1621  ident, NULL, NULL,
1622  NULL);
1623 
1624  if (nse != NULL)
1625  {
1626  switch (nse->itemtype)
1627  {
1628  case PLPGSQL_NSTYPE_VAR:
1629  return ((PLpgSQL_var *) (plpgsql_Datums[nse->itemno]))->datatype;
1630 
1631  /* XXX perhaps allow REC/ROW here? */
1632 
1633  default:
1634  return NULL;
1635  }
1636  }
1637 
1638  /*
1639  * Word wasn't found in the namespace stack. Try to find a data type with
1640  * that name, but ignore shell types and complex types.
1641  */
1642  typeName = makeTypeName(ident);
1643  typeTup = LookupTypeName(NULL, typeName, NULL, false);
1644  if (typeTup)
1645  {
1646  Form_pg_type typeStruct = (Form_pg_type) GETSTRUCT(typeTup);
1647 
1648  if (!typeStruct->typisdefined ||
1649  typeStruct->typrelid != InvalidOid)
1650  {
1651  ReleaseSysCache(typeTup);
1652  return NULL;
1653  }
1654 
1655  dtype = build_datatype(typeTup, -1,
1656  plpgsql_curr_compile->fn_input_collation,
1657  typeName);
1658 
1659  ReleaseSysCache(typeTup);
1660  return dtype;
1661  }
1662 
1663  /*
1664  * Nothing found - up to now it's a word without any special meaning for
1665  * us.
1666  */
1667  return NULL;
1668 }
1669 
1670 
1671 /* ----------
1672  * plpgsql_parse_cwordtype Same lookup for compositeword%TYPE
1673  * ----------
1674  */
1675 PLpgSQL_type *
1676 plpgsql_parse_cwordtype(List *idents)
1677 {
1678  PLpgSQL_type *dtype = NULL;
1679  PLpgSQL_nsitem *nse;
1680  const char *fldname;
1681  Oid classOid;
1682  HeapTuple classtup = NULL;
1683  HeapTuple attrtup = NULL;
1684  HeapTuple typetup = NULL;
1685  Form_pg_class classStruct;
1686  Form_pg_attribute attrStruct;
1687  MemoryContext oldCxt;
1688 
1689  /* Avoid memory leaks in the long-term function context */
1690  oldCxt = MemoryContextSwitchTo(plpgsql_compile_tmp_cxt);
1691 
1692  if (list_length(idents) == 2)
1693  {
1694  /*
1695  * Do a lookup in the current namespace stack. We don't need to check
1696  * number of names matched, because we will only consider scalar
1697  * variables.
1698  */
1699  nse = plpgsql_ns_lookup(plpgsql_ns_top(), false,
1700  strVal(linitial(idents)),
1701  strVal(lsecond(idents)),
1702  NULL,
1703  NULL);
1704 
1705  if (nse != NULL && nse->itemtype == PLPGSQL_NSTYPE_VAR)
1706  {
1707  dtype = ((PLpgSQL_var *) (plpgsql_Datums[nse->itemno]))->datatype;
1708  goto done;
1709  }
1710 
1711  /*
1712  * First word could also be a table name
1713  */
1714  classOid = RelnameGetRelid(strVal(linitial(idents)));
1715  if (!OidIsValid(classOid))
1716  goto done;
1717  fldname = strVal(lsecond(idents));
1718  }
1719  else if (list_length(idents) == 3)
1720  {
1721  RangeVar *relvar;
1722 
1723  relvar = makeRangeVar(strVal(linitial(idents)),
1724  strVal(lsecond(idents)),
1725  -1);
1726  /* Can't lock relation - we might not have privileges. */
1727  classOid = RangeVarGetRelid(relvar, NoLock, true);
1728  if (!OidIsValid(classOid))
1729  goto done;
1730  fldname = strVal(lthird(idents));
1731  }
1732  else
1733  goto done;
1734 
1735  classtup = SearchSysCache1(RELOID, ObjectIdGetDatum(classOid));
1736  if (!HeapTupleIsValid(classtup))
1737  goto done;
1738  classStruct = (Form_pg_class) GETSTRUCT(classtup);
1739 
1740  /*
1741  * It must be a relation, sequence, view, materialized view, composite
1742  * type, or foreign table
1743  */
1744  if (classStruct->relkind != RELKIND_RELATION &&
1745  classStruct->relkind != RELKIND_SEQUENCE &&
1746  classStruct->relkind != RELKIND_VIEW &&
1747  classStruct->relkind != RELKIND_MATVIEW &&
1748  classStruct->relkind != RELKIND_COMPOSITE_TYPE &&
1749  classStruct->relkind != RELKIND_FOREIGN_TABLE &&
1750  classStruct->relkind != RELKIND_PARTITIONED_TABLE)
1751  goto done;
1752 
1753  /*
1754  * Fetch the named table field and its type
1755  */
1756  attrtup = SearchSysCacheAttName(classOid, fldname);
1757  if (!HeapTupleIsValid(attrtup))
1758  goto done;
1759  attrStruct = (Form_pg_attribute) GETSTRUCT(attrtup);
1760 
1761  typetup = SearchSysCache1(TYPEOID,
1762  ObjectIdGetDatum(attrStruct->atttypid));
1763  if (!HeapTupleIsValid(typetup))
1764  elog(ERROR, "cache lookup failed for type %u", attrStruct->atttypid);
1765 
1766  /*
1767  * Found that - build a compiler type struct in the caller's cxt and
1768  * return it. Note that we treat the type as being found-by-OID; no
1769  * attempt to re-look-up the type name will happen during invalidations.
1770  */
1771  MemoryContextSwitchTo(oldCxt);
1772  dtype = build_datatype(typetup,
1773  attrStruct->atttypmod,
1774  attrStruct->attcollation,
1775  NULL);
1776  MemoryContextSwitchTo(plpgsql_compile_tmp_cxt);
1777 
1778 done:
1779  if (HeapTupleIsValid(classtup))
1780  ReleaseSysCache(classtup);
1781  if (HeapTupleIsValid(attrtup))
1782  ReleaseSysCache(attrtup);
1783  if (HeapTupleIsValid(typetup))
1784  ReleaseSysCache(typetup);
1785 
1786  MemoryContextSwitchTo(oldCxt);
1787  return dtype;
1788 }
1789 
1790 /* ----------
1791  * plpgsql_parse_wordrowtype Scanner found word%ROWTYPE.
1792  * So word must be a table name.
1793  * ----------
1794  */
1795 PLpgSQL_type *
1796 plpgsql_parse_wordrowtype(char *ident)
1797 {
1798  Oid classOid;
1799  Oid typOid;
1800 
1801  /*
1802  * Look up the relation. Note that because relation rowtypes have the
1803  * same names as their relations, this could be handled as a type lookup
1804  * equally well; we use the relation lookup code path only because the
1805  * errors thrown here have traditionally referred to relations not types.
1806  * But we'll make a TypeName in case we have to do re-look-up of the type.
1807  */
1808  classOid = RelnameGetRelid(ident);
1809  if (!OidIsValid(classOid))
1810  ereport(ERROR,
1811  (errcode(ERRCODE_UNDEFINED_TABLE),
1812  errmsg("relation \"%s\" does not exist", ident)));
1813 
1814  /* Some relkinds lack type OIDs */
1815  typOid = get_rel_type_id(classOid);
1816  if (!OidIsValid(typOid))
1817  ereport(ERROR,
1818  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
1819  errmsg("relation \"%s\" does not have a composite type",
1820  ident)));
1821 
1822  /* Build and return the row type struct */
1823  return plpgsql_build_datatype(typOid, -1, InvalidOid,
1824  makeTypeName(ident));
1825 }
1826 
1827 /* ----------
1828  * plpgsql_parse_cwordrowtype Scanner found compositeword%ROWTYPE.
1829  * So word must be a namespace qualified table name.
1830  * ----------
1831  */
1832 PLpgSQL_type *
1833 plpgsql_parse_cwordrowtype(List *idents)
1834 {
1835  Oid classOid;
1836  Oid typOid;
1837  RangeVar *relvar;
1838  MemoryContext oldCxt;
1839 
1840  /*
1841  * As above, this is a relation lookup but could be a type lookup if we
1842  * weren't being backwards-compatible about error wording.
1843  */
1844  if (list_length(idents) != 2)
1845  return NULL;
1846 
1847  /* Avoid memory leaks in long-term function context */
1848  oldCxt = MemoryContextSwitchTo(plpgsql_compile_tmp_cxt);
1849 
1850  /* Look up relation name. Can't lock it - we might not have privileges. */
1851  relvar = makeRangeVar(strVal(linitial(idents)),
1852  strVal(lsecond(idents)),
1853  -1);
1854  classOid = RangeVarGetRelid(relvar, NoLock, false);
1855 
1856  /* Some relkinds lack type OIDs */
1857  typOid = get_rel_type_id(classOid);
1858  if (!OidIsValid(typOid))
1859  ereport(ERROR,
1860  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
1861  errmsg("relation \"%s\" does not have a composite type",
1862  strVal(lsecond(idents)))));
1863 
1864  MemoryContextSwitchTo(oldCxt);
1865 
1866  /* Build and return the row type struct */
1867  return plpgsql_build_datatype(typOid, -1, InvalidOid,
1868  makeTypeNameFromNameList(idents));
1869 }
1870 
1871 /*
1872  * plpgsql_build_variable - build a datum-array entry of a given
1873  * datatype
1874  *
1875  * The returned struct may be a PLpgSQL_var or PLpgSQL_rec
1876  * depending on the given datatype, and is allocated via
1877  * palloc. The struct is automatically added to the current datum
1878  * array, and optionally to the current namespace.
1879  */
1880 PLpgSQL_variable *
1881 plpgsql_build_variable(const char *refname, int lineno, PLpgSQL_type *dtype,
1882  bool add2namespace)
1883 {
1884  PLpgSQL_variable *result;
1885 
1886  switch (dtype->ttype)
1887  {
1888  case PLPGSQL_TTYPE_SCALAR:
1889  {
1890  /* Ordinary scalar datatype */
1891  PLpgSQL_var *var;
1892 
1893  var = palloc0(sizeof(PLpgSQL_var));
1894  var->dtype = PLPGSQL_DTYPE_VAR;
1895  var->refname = pstrdup(refname);
1896  var->lineno = lineno;
1897  var->datatype = dtype;
1898  /* other fields are left as 0, might be changed by caller */
1899 
1900  /* preset to NULL */
1901  var->value = 0;
1902  var->isnull = true;
1903  var->freeval = false;
1904 
1905  plpgsql_adddatum((PLpgSQL_datum *) var);
1906  if (add2namespace)
1907  plpgsql_ns_additem(PLPGSQL_NSTYPE_VAR,
1908  var->dno,
1909  refname);
1910  result = (PLpgSQL_variable *) var;
1911  break;
1912  }
1913  case PLPGSQL_TTYPE_REC:
1914  {
1915  /* Composite type -- build a record variable */
1916  PLpgSQL_rec *rec;
1917 
1918  rec = plpgsql_build_record(refname, lineno,
1919  dtype, dtype->typoid,
1920  add2namespace);
1921  result = (PLpgSQL_variable *) rec;
1922  break;
1923  }
1924  case PLPGSQL_TTYPE_PSEUDO:
1925  ereport(ERROR,
1926  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1927  errmsg("variable \"%s\" has pseudo-type %s",
1928  refname, format_type_be(dtype->typoid))));
1929  result = NULL; /* keep compiler quiet */
1930  break;
1931  default:
1932  elog(ERROR, "unrecognized ttype: %d", dtype->ttype);
1933  result = NULL; /* keep compiler quiet */
1934  break;
1935  }
1936 
1937  return result;
1938 }
1939 
1940 /*
1941  * Build empty named record variable, and optionally add it to namespace
1942  */
1943 PLpgSQL_rec *
1944 plpgsql_build_record(const char *refname, int lineno,
1945  PLpgSQL_type *dtype, Oid rectypeid,
1946  bool add2namespace)
1947 {
1948  PLpgSQL_rec *rec;
1949 
1950  rec = palloc0(sizeof(PLpgSQL_rec));
1951  rec->dtype = PLPGSQL_DTYPE_REC;
1952  rec->refname = pstrdup(refname);
1953  rec->lineno = lineno;
1954  /* other fields are left as 0, might be changed by caller */
1955  rec->datatype = dtype;
1956  rec->rectypeid = rectypeid;
1957  rec->firstfield = -1;
1958  rec->erh = NULL;
1959  plpgsql_adddatum((PLpgSQL_datum *) rec);
1960  if (add2namespace)
1961  plpgsql_ns_additem(PLPGSQL_NSTYPE_REC, rec->dno, rec->refname);
1962 
1963  return rec;
1964 }
1965 
1966 /*
1967  * Build a row-variable data structure given the component variables.
1968  * Include a rowtupdesc, since we will need to materialize the row result.
1969  */
1970 static PLpgSQL_row *
1971 build_row_from_vars(PLpgSQL_variable **vars, int numvars)
1972 {
1973  PLpgSQL_row *row;
1974  int i;
1975 
1976  row = palloc0(sizeof(PLpgSQL_row));
1977  row->dtype = PLPGSQL_DTYPE_ROW;
1978  row->refname = "(unnamed row)";
1979  row->lineno = -1;
1980  row->rowtupdesc = CreateTemplateTupleDesc(numvars);
1981  row->nfields = numvars;
1982  row->fieldnames = palloc(numvars * sizeof(char *));
1983  row->varnos = palloc(numvars * sizeof(int));
1984 
1985  for (i = 0; i < numvars; i++)
1986  {
1987  PLpgSQL_variable *var = vars[i];
1988  Oid typoid;
1989  int32 typmod;
1990  Oid typcoll;
1991 
1992  /* Member vars of a row should never be const */
1993  Assert(!var->isconst);
1994 
1995  switch (var->dtype)
1996  {
1997  case PLPGSQL_DTYPE_VAR:
1998  case PLPGSQL_DTYPE_PROMISE:
1999  typoid = ((PLpgSQL_var *) var)->datatype->typoid;
2000  typmod = ((PLpgSQL_var *) var)->datatype->atttypmod;
2001  typcoll = ((PLpgSQL_var *) var)->datatype->collation;
2002  break;
2003 
2004  case PLPGSQL_DTYPE_REC:
2005  /* shouldn't need to revalidate rectypeid already... */
2006  typoid = ((PLpgSQL_rec *) var)->rectypeid;
2007  typmod = -1; /* don't know typmod, if it's used at all */
2008  typcoll = InvalidOid; /* composite types have no collation */
2009  break;
2010 
2011  default:
2012  elog(ERROR, "unrecognized dtype: %d", var->dtype);
2013  typoid = InvalidOid; /* keep compiler quiet */
2014  typmod = 0;
2015  typcoll = InvalidOid;
2016  break;
2017  }
2018 
2019  row->fieldnames[i] = var->refname;
2020  row->varnos[i] = var->dno;
2021 
2022  TupleDescInitEntry(row->rowtupdesc, i + 1,
2023  var->refname,
2024  typoid, typmod,
2025  0);
2026  TupleDescInitEntryCollation(row->rowtupdesc, i + 1, typcoll);
2027  }
2028 
2029  return row;
2030 }
2031 
2032 /*
2033  * Build a RECFIELD datum for the named field of the specified record variable
2034  *
2035  * If there's already such a datum, just return it; we don't need duplicates.
2036  */
2037 PLpgSQL_recfield *
2038 plpgsql_build_recfield(PLpgSQL_rec *rec, const char *fldname)
2039 {
2040  PLpgSQL_recfield *recfield;
2041  int i;
2042 
2043  /* search for an existing datum referencing this field */
2044  i = rec->firstfield;
2045  while (i >= 0)
2046  {
2047  PLpgSQL_recfield *fld = (PLpgSQL_recfield *) plpgsql_Datums[i];
2048 
2049  Assert(fld->dtype == PLPGSQL_DTYPE_RECFIELD &&
2050  fld->recparentno == rec->dno);
2051  if (strcmp(fld->fieldname, fldname) == 0)
2052  return fld;
2053  i = fld->nextfield;
2054  }
2055 
2056  /* nope, so make a new one */
2057  recfield = palloc0(sizeof(PLpgSQL_recfield));
2058  recfield->dtype = PLPGSQL_DTYPE_RECFIELD;
2059  recfield->fieldname = pstrdup(fldname);
2060  recfield->recparentno = rec->dno;
2061  recfield->rectupledescid = INVALID_TUPLEDESC_IDENTIFIER;
2062 
2063  plpgsql_adddatum((PLpgSQL_datum *) recfield);
2064 
2065  /* now we can link it into the parent's chain */
2066  recfield->nextfield = rec->firstfield;
2067  rec->firstfield = recfield->dno;
2068 
2069  return recfield;
2070 }
2071 
2072 /*
2073  * plpgsql_build_datatype
2074  * Build PLpgSQL_type struct given type OID, typmod, collation,
2075  * and type's parsed name.
2076  *
2077  * If collation is not InvalidOid then it overrides the type's default
2078  * collation. But collation is ignored if the datatype is non-collatable.
2079  *
2080  * origtypname is the parsed form of what the user wrote as the type name.
2081  * It can be NULL if the type could not be a composite type, or if it was
2082  * identified by OID to begin with (e.g., it's a function argument type).
2083  */
2084 PLpgSQL_type *
2085 plpgsql_build_datatype(Oid typeOid, int32 typmod,
2086  Oid collation, TypeName *origtypname)
2087 {
2088  HeapTuple typeTup;
2089  PLpgSQL_type *typ;
2090 
2091  typeTup = SearchSysCache1(TYPEOID, ObjectIdGetDatum(typeOid));
2092  if (!HeapTupleIsValid(typeTup))
2093  elog(ERROR, "cache lookup failed for type %u", typeOid);
2094 
2095  typ = build_datatype(typeTup, typmod, collation, origtypname);
2096 
2097  ReleaseSysCache(typeTup);
2098 
2099  return typ;
2100 }
2101 
2102 /*
2103  * Utility subroutine to make a PLpgSQL_type struct given a pg_type entry
2104  * and additional details (see comments for plpgsql_build_datatype).
2105  */
2106 static PLpgSQL_type *
2107 build_datatype(HeapTuple typeTup, int32 typmod,
2108  Oid collation, TypeName *origtypname)
2109 {
2110  Form_pg_type typeStruct = (Form_pg_type) GETSTRUCT(typeTup);
2111  PLpgSQL_type *typ;
2112 
2113  if (!typeStruct->typisdefined)
2114  ereport(ERROR,
2115  (errcode(ERRCODE_UNDEFINED_OBJECT),
2116  errmsg("type \"%s\" is only a shell",
2117  NameStr(typeStruct->typname))));
2118 
2119  typ = (PLpgSQL_type *) palloc(sizeof(PLpgSQL_type));
2120 
2121  typ->typname = pstrdup(NameStr(typeStruct->typname));
2122  typ->typoid = typeStruct->oid;
2123  switch (typeStruct->typtype)
2124  {
2125  case TYPTYPE_BASE:
2126  case TYPTYPE_ENUM:
2127  case TYPTYPE_RANGE:
2128  case TYPTYPE_MULTIRANGE:
2129  typ->ttype = PLPGSQL_TTYPE_SCALAR;
2130  break;
2131  case TYPTYPE_COMPOSITE:
2132  typ->ttype = PLPGSQL_TTYPE_REC;
2133  break;
2134  case TYPTYPE_DOMAIN:
2135  if (type_is_rowtype(typeStruct->typbasetype))
2136  typ->ttype = PLPGSQL_TTYPE_REC;
2137  else
2138  typ->ttype = PLPGSQL_TTYPE_SCALAR;
2139  break;
2140  case TYPTYPE_PSEUDO:
2141  if (typ->typoid == RECORDOID)
2142  typ->ttype = PLPGSQL_TTYPE_REC;
2143  else
2144  typ->ttype = PLPGSQL_TTYPE_PSEUDO;
2145  break;
2146  default:
2147  elog(ERROR, "unrecognized typtype: %d",
2148  (int) typeStruct->typtype);
2149  break;
2150  }
2151  typ->typlen = typeStruct->typlen;
2152  typ->typbyval = typeStruct->typbyval;
2153  typ->typtype = typeStruct->typtype;
2154  typ->collation = typeStruct->typcollation;
2155  if (OidIsValid(collation) && OidIsValid(typ->collation))
2156  typ->collation = collation;
2157  /* Detect if type is true array, or domain thereof */
2158  /* NB: this is only used to decide whether to apply expand_array */
2159  if (typeStruct->typtype == TYPTYPE_BASE)
2160  {
2161  /*
2162  * This test should include what get_element_type() checks. We also
2163  * disallow non-toastable array types (i.e. oidvector and int2vector).
2164  */
2165  typ->typisarray = (IsTrueArrayType(typeStruct) &&
2166  typeStruct->typstorage != TYPSTORAGE_PLAIN);
2167  }
2168  else if (typeStruct->typtype == TYPTYPE_DOMAIN)
2169  {
2170  /* we can short-circuit looking up base types if it's not varlena */
2171  typ->typisarray = (typeStruct->typlen == -1 &&
2172  typeStruct->typstorage != TYPSTORAGE_PLAIN &&
2173  OidIsValid(get_base_element_type(typeStruct->typbasetype)));
2174  }
2175  else
2176  typ->typisarray = false;
2177  typ->atttypmod = typmod;
2178 
2179  /*
2180  * If it's a named composite type (or domain over one), find the typcache
2181  * entry and record the current tupdesc ID, so we can detect changes
2182  * (including drops). We don't currently support on-the-fly replacement
2183  * of non-composite types, else we might want to do this for them too.
2184  */
2185  if (typ->ttype == PLPGSQL_TTYPE_REC && typ->typoid != RECORDOID)
2186  {
2187  TypeCacheEntry *typentry;
2188 
2189  typentry = lookup_type_cache(typ->typoid,
2190  TYPECACHE_TUPDESC |
2191  TYPECACHE_DOMAIN_BASE_INFO);
2192  if (typentry->typtype == TYPTYPE_DOMAIN)
2193  typentry = lookup_type_cache(typentry->domainBaseType,
2194  TYPECACHE_TUPDESC);
2195  if (typentry->tupDesc == NULL)
2196  ereport(ERROR,
2197  (errcode(ERRCODE_WRONG_OBJECT_TYPE),
2198  errmsg("type %s is not composite",
2199  format_type_be(typ->typoid))));
2200 
2201  typ->origtypname = origtypname;
2202  typ->tcache = typentry;
2203  typ->tupdesc_id = typentry->tupDesc_identifier;
2204  }
2205  else
2206  {
2207  typ->origtypname = NULL;
2208  typ->tcache = NULL;
2209  typ->tupdesc_id = 0;
2210  }
2211 
2212  return typ;
2213 }
2214 
2215 /*
2216  * plpgsql_recognize_err_condition
2217  * Check condition name and translate it to SQLSTATE.
2218  *
2219  * Note: there are some cases where the same condition name has multiple
2220  * entries in the table. We arbitrarily return the first match.
2221  */
2222 int
2223 plpgsql_recognize_err_condition(const char *condname, bool allow_sqlstate)
2224 {
2225  int i;
2226 
2227  if (allow_sqlstate)
2228  {
2229  if (strlen(condname) == 5 &&
2230  strspn(condname, "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ") == 5)
2231  return MAKE_SQLSTATE(condname[0],
2232  condname[1],
2233  condname[2],
2234  condname[3],
2235  condname[4]);
2236  }
2237 
2238  for (i = 0; exception_label_map[i].label != NULL; i++)
2239  {
2240  if (strcmp(condname, exception_label_map[i].label) == 0)
2241  return exception_label_map[i].sqlerrstate;
2242  }
2243 
2244  ereport(ERROR,
2245  (errcode(ERRCODE_UNDEFINED_OBJECT),
2246  errmsg("unrecognized exception condition \"%s\"",
2247  condname)));
2248  return 0; /* keep compiler quiet */
2249 }
2250 
2251 /*
2252  * plpgsql_parse_err_condition
2253  * Generate PLpgSQL_condition entry(s) for an exception condition name
2254  *
2255  * This has to be able to return a list because there are some duplicate
2256  * names in the table of error code names.
2257  */
2258 PLpgSQL_condition *
2259 plpgsql_parse_err_condition(char *condname)
2260 {
2261  int i;
2262  PLpgSQL_condition *new;
2263  PLpgSQL_condition *prev;
2264 
2265  /*
2266  * XXX Eventually we will want to look for user-defined exception names
2267  * here.
2268  */
2269 
2270  /*
2271  * OTHERS is represented as code 0 (which would map to '00000', but we
2272  * have no need to represent that as an exception condition).
2273  */
2274  if (strcmp(condname, "others") == 0)
2275  {
2276  new = palloc(sizeof(PLpgSQL_condition));
2277  new->sqlerrstate = 0;
2278  new->condname = condname;
2279  new->next = NULL;
2280  return new;
2281  }
2282 
2283  prev = NULL;
2284  for (i = 0; exception_label_map[i].label != NULL; i++)
2285  {
2286  if (strcmp(condname, exception_label_map[i].label) == 0)
2287  {
2288  new = palloc(sizeof(PLpgSQL_condition));
2289  new->sqlerrstate = exception_label_map[i].sqlerrstate;
2290  new->condname = condname;
2291  new->next = prev;
2292  prev = new;
2293  }
2294  }
2295 
2296  if (!prev)
2297  ereport(ERROR,
2298  (errcode(ERRCODE_UNDEFINED_OBJECT),
2299  errmsg("unrecognized exception condition \"%s\"",
2300  condname)));
2301 
2302  return prev;
2303 }
2304 
2305 /* ----------
2306  * plpgsql_start_datums Initialize datum list at compile startup.
2307  * ----------
2308  */
2309 static void
2310 plpgsql_start_datums(void)
2311 {
2312  datums_alloc = 128;
2313  plpgsql_nDatums = 0;
2314  /* This is short-lived, so needn't allocate in function's cxt */
2315  plpgsql_Datums = MemoryContextAlloc(plpgsql_compile_tmp_cxt,
2316  sizeof(PLpgSQL_datum *) * datums_alloc);
2317  /* datums_last tracks what's been seen by plpgsql_add_initdatums() */
2318  datums_last = 0;
2319 }
2320 
2321 /* ----------
2322  * plpgsql_adddatum Add a variable, record or row
2323  * to the compiler's datum list.
2324  * ----------
2325  */
2326 void
2327 plpgsql_adddatum(PLpgSQL_datum *newdatum)
2328 {
2329  if (plpgsql_nDatums == datums_alloc)
2330  {
2331  datums_alloc *= 2;
2332  plpgsql_Datums = repalloc(plpgsql_Datums, sizeof(PLpgSQL_datum *) * datums_alloc);
2333  }
2334 
2335  newdatum->dno = plpgsql_nDatums;
2336  plpgsql_Datums[plpgsql_nDatums++] = newdatum;
2337 }
2338 
2339 /* ----------
2340  * plpgsql_finish_datums Copy completed datum info into function struct.
2341  * ----------
2342  */
2343 static void
2344 plpgsql_finish_datums(PLpgSQL_function *function)
2345 {
2346  Size copiable_size = 0;
2347  int i;
2348 
2349  function->ndatums = plpgsql_nDatums;
2350  function->datums = palloc(sizeof(PLpgSQL_datum *) * plpgsql_nDatums);
2351  for (i = 0; i < plpgsql_nDatums; i++)
2352  {
2353  function->datums[i] = plpgsql_Datums[i];
2354 
2355  /* This must agree with copy_plpgsql_datums on what is copiable */
2356  switch (function->datums[i]->dtype)
2357  {
2358  case PLPGSQL_DTYPE_VAR:
2359  case PLPGSQL_DTYPE_PROMISE:
2360  copiable_size += MAXALIGN(sizeof(PLpgSQL_var));
2361  break;
2362  case PLPGSQL_DTYPE_REC:
2363  copiable_size += MAXALIGN(sizeof(PLpgSQL_rec));
2364  break;
2365  default:
2366  break;
2367  }
2368  }
2369  function->copiable_size = copiable_size;
2370 }
2371 
2372 
2373 /* ----------
2374  * plpgsql_add_initdatums Make an array of the datum numbers of
2375  * all the initializable datums created since the last call
2376  * to this function.
2377  *
2378  * If varnos is NULL, we just forget any datum entries created since the
2379  * last call.
2380  *
2381  * This is used around a DECLARE section to create a list of the datums
2382  * that have to be initialized at block entry. Note that datums can also
2383  * be created elsewhere than DECLARE, eg by a FOR-loop, but it is then
2384  * the responsibility of special-purpose code to initialize them.
2385  * ----------
2386  */
2387 int
2388 plpgsql_add_initdatums(int **varnos)
2389 {
2390  int i;
2391  int n = 0;
2392 
2393  /*
2394  * The set of dtypes recognized here must match what exec_stmt_block()
2395  * cares about (re)initializing at block entry.
2396  */
2397  for (i = datums_last; i < plpgsql_nDatums; i++)
2398  {
2399  switch (plpgsql_Datums[i]->dtype)
2400  {
2401  case PLPGSQL_DTYPE_VAR:
2402  case PLPGSQL_DTYPE_REC:
2403  n++;
2404  break;
2405 
2406  default:
2407  break;
2408  }
2409  }
2410 
2411  if (varnos != NULL)
2412  {
2413  if (n > 0)
2414  {
2415  *varnos = (int *) palloc(sizeof(int) * n);
2416 
2417  n = 0;
2418  for (i = datums_last; i < plpgsql_nDatums; i++)
2419  {
2420  switch (plpgsql_Datums[i]->dtype)
2421  {
2422  case PLPGSQL_DTYPE_VAR:
2423  case PLPGSQL_DTYPE_REC:
2424  (*varnos)[n++] = plpgsql_Datums[i]->dno;
2425 
2426  default:
2427  break;
2428  }
2429  }
2430  }
2431  else
2432  *varnos = NULL;
2433  }
2434 
2435  datums_last = plpgsql_nDatums;
2436  return n;
2437 }
2438 
2439 
2440 /*
2441  * Compute the hashkey for a given function invocation
2442  *
2443  * The hashkey is returned into the caller-provided storage at *hashkey.
2444  */
2445 static void
2446 compute_function_hashkey(FunctionCallInfo fcinfo,
2447  Form_pg_proc procStruct,
2448  PLpgSQL_func_hashkey *hashkey,
2449  bool forValidator)
2450 {
2451  /* Make sure any unused bytes of the struct are zero */
2452  MemSet(hashkey, 0, sizeof(PLpgSQL_func_hashkey));
2453 
2454  /* get function OID */
2455  hashkey->funcOid = fcinfo->flinfo->fn_oid;
2456 
2457  /* get call context */
2458  hashkey->isTrigger = CALLED_AS_TRIGGER(fcinfo);
2459  hashkey->isEventTrigger = CALLED_AS_EVENT_TRIGGER(fcinfo);
2460 
2461  /*
2462  * If DML trigger, include trigger's OID in the hash, so that each trigger
2463  * usage gets a different hash entry, allowing for e.g. different relation
2464  * rowtypes or transition table names. In validation mode we do not know
2465  * what relation or transition table names are intended to be used, so we
2466  * leave trigOid zero; the hash entry built in this case will never be
2467  * used for any actual calls.
2468  *
2469  * We don't currently need to distinguish different event trigger usages
2470  * in the same way, since the special parameter variables don't vary in
2471  * type in that case.
2472  */
2473  if (hashkey->isTrigger && !forValidator)
2474  {
2475  TriggerData *trigdata = (TriggerData *) fcinfo->context;
2476 
2477  hashkey->trigOid = trigdata->tg_trigger->tgoid;
2478  }
2479 
2480  /* get input collation, if known */
2481  hashkey->inputCollation = fcinfo->fncollation;
2482 
2483  if (procStruct->pronargs > 0)
2484  {
2485  /* get the argument types */
2486  memcpy(hashkey->argtypes, procStruct->proargtypes.values,
2487  procStruct->pronargs * sizeof(Oid));
2488 
2489  /* resolve any polymorphic argument types */
2490  plpgsql_resolve_polymorphic_argtypes(procStruct->pronargs,
2491  hashkey->argtypes,
2492  NULL,
2493  fcinfo->flinfo->fn_expr,
2494  forValidator,
2495  NameStr(procStruct->proname));
2496  }
2497 }
2498 
2499 /*
2500  * This is the same as the standard resolve_polymorphic_argtypes() function,
2501  * except that:
2502  * 1. We go ahead and report the error if we can't resolve the types.
2503  * 2. We treat RECORD-type input arguments (not output arguments) as if
2504  * they were polymorphic, replacing their types with the actual input
2505  * types if we can determine those. This allows us to create a separate
2506  * function cache entry for each named composite type passed to such an
2507  * argument.
2508  * 3. In validation mode, we have no inputs to look at, so assume that
2509  * polymorphic arguments are integer, integer-array or integer-range.
2510  */
2511 static void
2512 plpgsql_resolve_polymorphic_argtypes(int numargs,
2513  Oid *argtypes, char *argmodes,
2514  Node *call_expr, bool forValidator,
2515  const char *proname)
2516 {
2517  int i;
2518 
2519  if (!forValidator)
2520  {
2521  int inargno;
2522 
2523  /* normal case, pass to standard routine */
2524  if (!resolve_polymorphic_argtypes(numargs, argtypes, argmodes,
2525  call_expr))
2526  ereport(ERROR,
2527  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2528  errmsg("could not determine actual argument "
2529  "type for polymorphic function \"%s\"",
2530  proname)));
2531  /* also, treat RECORD inputs (but not outputs) as polymorphic */
2532  inargno = 0;
2533  for (i = 0; i < numargs; i++)
2534  {
2535  char argmode = argmodes ? argmodes[i] : PROARGMODE_IN;
2536 
2537  if (argmode == PROARGMODE_OUT || argmode == PROARGMODE_TABLE)
2538  continue;
2539  if (argtypes[i] == RECORDOID || argtypes[i] == RECORDARRAYOID)
2540  {
2541  Oid resolvedtype = get_call_expr_argtype(call_expr,
2542  inargno);
2543 
2544  if (OidIsValid(resolvedtype))
2545  argtypes[i] = resolvedtype;
2546  }
2547  inargno++;
2548  }
2549  }
2550  else
2551  {
2552  /* special validation case (no need to do anything for RECORD) */
2553  for (i = 0; i < numargs; i++)
2554  {
2555  switch (argtypes[i])
2556  {
2557  case ANYELEMENTOID:
2558  case ANYNONARRAYOID:
2559  case ANYENUMOID: /* XXX dubious */
2560  case ANYCOMPATIBLEOID:
2561  case ANYCOMPATIBLENONARRAYOID:
2562  argtypes[i] = INT4OID;
2563  break;
2564  case ANYARRAYOID:
2565  case ANYCOMPATIBLEARRAYOID:
2566  argtypes[i] = INT4ARRAYOID;
2567  break;
2568  case ANYRANGEOID:
2569  case ANYCOMPATIBLERANGEOID:
2570  argtypes[i] = INT4RANGEOID;
2571  break;
2572  case ANYMULTIRANGEOID:
2573  argtypes[i] = INT4MULTIRANGEOID;
2574  break;
2575  default:
2576  break;
2577  }
2578  }
2579  }
2580 }
2581 
2582 /*
2583  * delete_function - clean up as much as possible of a stale function cache
2584  *
2585  * We can't release the PLpgSQL_function struct itself, because of the
2586  * possibility that there are fn_extra pointers to it. We can release
2587  * the subsidiary storage, but only if there are no active evaluations
2588  * in progress. Otherwise we'll just leak that storage. Since the
2589  * case would only occur if a pg_proc update is detected during a nested
2590  * recursive call on the function, a leak seems acceptable.
2591  *
2592  * Note that this can be called more than once if there are multiple fn_extra
2593  * pointers to the same function cache. Hence be careful not to do things
2594  * twice.
2595  */
2596 static void
2597 delete_function(PLpgSQL_function *func)
2598 {
2599  /* remove function from hash table (might be done already) */
2600  plpgsql_HashTableDelete(func);
2601 
2602  /* release the function's storage if safe and not done already */
2603  if (func->use_count == 0)
2604  plpgsql_free_function_memory(func);
2605 }
2606 
2607 /* exported so we can call it from _PG_init() */
2608 void
2609 plpgsql_HashTableInit(void)
2610 {
2611  HASHCTL ctl;
2612 
2613  /* don't allow double-initialization */
2614  Assert(plpgsql_HashTable == NULL);
2615 
2616  ctl.keysize = sizeof(PLpgSQL_func_hashkey);
2617  ctl.entrysize = sizeof(plpgsql_HashEnt);
2618  plpgsql_HashTable = hash_create("PLpgSQL function hash",
2619  FUNCS_PER_USER,
2620  &ctl,
2621  HASH_ELEM | HASH_BLOBS);
2622 }
2623 
2624 static PLpgSQL_function *
2625 plpgsql_HashTableLookup(PLpgSQL_func_hashkey *func_key)
2626 {
2627  plpgsql_HashEnt *hentry;
2628 
2629  hentry = (plpgsql_HashEnt *) hash_search(plpgsql_HashTable,
2630  func_key,
2631  HASH_FIND,
2632  NULL);
2633  if (hentry)
2634  return hentry->function;
2635  else
2636  return NULL;
2637 }
2638 
2639 static void
2640 plpgsql_HashTableInsert(PLpgSQL_function *function,
2641  PLpgSQL_func_hashkey *func_key)
2642 {
2643  plpgsql_HashEnt *hentry;
2644  bool found;
2645 
2646  hentry = (plpgsql_HashEnt *) hash_search(plpgsql_HashTable,
2647  func_key,
2648  HASH_ENTER,
2649  &found);
2650  if (found)
2651  elog(WARNING, "trying to insert a function that already exists");
2652 
2653  hentry->function = function;
2654  /* prepare back link from function to hashtable key */
2655  function->fn_hashkey = &hentry->key;
2656 }
2657 
2658 static void
2659 plpgsql_HashTableDelete(PLpgSQL_function *function)
2660 {
2661  plpgsql_HashEnt *hentry;
2662 
2663  /* do nothing if not in table */
2664  if (function->fn_hashkey == NULL)
2665  return;
2666 
2667  hentry = (plpgsql_HashEnt *) hash_search(plpgsql_HashTable,
2668  function->fn_hashkey,
2669  HASH_REMOVE,
2670  NULL);
2671  if (hentry == NULL)
2672  elog(WARNING, "trying to delete function that does not exist");
2673 
2674  /* remove back link, which no longer points to allocated storage */
2675  function->fn_hashkey = NULL;
2676 }
bms_add_member
Bitmapset * bms_add_member(Bitmapset *a, int x)
Definition: bitmapset.c:755
TextDatumGetCString
#define TextDatumGetCString(d)
Definition: builtins.h:95
NameStr
#define NameStr(name)
Definition: c.h:730
MAXALIGN
#define MAXALIGN(LEN)
Definition: c.h:795
int32
signed int int32
Definition: c.h:478
MemSet
#define MemSet(start, val, len)
Definition: c.h:1004
OidIsValid
#define OidIsValid(objectId)
Definition: c.h:759
Size
size_t Size
Definition: c.h:589
hash_search
void * hash_search(HTAB *hashp, const void *keyPtr, HASHACTION action, bool *foundPtr)
Definition: dynahash.c:953
hash_create
HTAB * hash_create(const char *tabname, long nelem, const HASHCTL *info, int flags)
Definition: dynahash.c:350
errdetail
int errdetail(const char *fmt,...)
Definition: elog.c:1202
error_context_stack
ErrorContextCallback * error_context_stack
Definition: elog.c:95
errhint
int errhint(const char *fmt,...)
Definition: elog.c:1316
errcode
int errcode(int sqlerrcode)
Definition: elog.c:858
errmsg
int errmsg(const char *fmt,...)
Definition: elog.c:1069
errcontext
#define errcontext
Definition: elog.h:196
WARNING
#define WARNING
Definition: elog.h:36
ERROR
#define ERROR
Definition: elog.h:39
MAKE_SQLSTATE
#define MAKE_SQLSTATE(ch1, ch2, ch3, ch4, ch5)
Definition: elog.h:56
ereport
#define ereport(elevel,...)
Definition: elog.h:149
name
const char * name
Definition: encode.c:571
CALLED_AS_EVENT_TRIGGER
#define CALLED_AS_EVENT_TRIGGER(fcinfo)
Definition: event_trigger.h:41
get_call_expr_argtype
Oid get_call_expr_argtype(Node *expr, int argnum)
Definition: fmgr.c:1916
get_fn_expr_rettype
Oid get_fn_expr_rettype(FmgrInfo *flinfo)
Definition: fmgr.c:1875
format_type_be
char * format_type_be(Oid type_oid)
Definition: format_type.c:339
resolve_polymorphic_argtypes
bool resolve_polymorphic_argtypes(int numargs, Oid *argtypes, char *argmodes, Node *call_expr)
Definition: funcapi.c:1056
get_func_arg_info
int get_func_arg_info(HeapTuple procTup, Oid **p_argtypes, char ***p_argnames, char **p_argmodes)
Definition: funcapi.c:1371
check_function_bodies
bool check_function_bodies
Definition: guc_tables.c:483
HASH_FIND
@ HASH_FIND
Definition: hsearch.h:113
HASH_REMOVE
@ HASH_REMOVE
Definition: hsearch.h:115
HASH_ENTER
@ HASH_ENTER
Definition: hsearch.h:114
HASH_ELEM
#define HASH_ELEM
Definition: hsearch.h:95
HASH_BLOBS
#define HASH_BLOBS
Definition: hsearch.h:97
HeapTupleIsValid
#define HeapTupleIsValid(tuple)
Definition: htup.h:78
htup_details.h
HeapTupleHeaderGetRawXmin
#define HeapTupleHeaderGetRawXmin(tup)
Definition: htup_details.h:304
GETSTRUCT
#define GETSTRUCT(TUP)
Definition: htup_details.h:653
ident
#define ident
Definition: indent_codes.h:47
i
int i
Definition: isn.c:73
if
if(TABLE==NULL||TABLE_index==NULL)
Definition: isn.c:77
ItemPointerEquals
bool ItemPointerEquals(ItemPointer pointer1, ItemPointer pointer2)
Definition: itemptr.c:35
Assert
Assert(fmt[strlen(fmt) - 1] !='\n')
lappend
List * lappend(List *list, void *datum)
Definition: list.c:338
NoLock
#define NoLock
Definition: lockdefs.h:34
type_is_rowtype
bool type_is_rowtype(Oid typid)
Definition: lsyscache.c:2613
get_rel_type_id
Oid get_rel_type_id(Oid relid)
Definition: lsyscache.c:1961
get_base_element_type
Oid get_base_element_type(Oid typid)
Definition: lsyscache.c:2790
makeTypeName
TypeName * makeTypeName(char *typnam)
Definition: makefuncs.c:446
makeTypeNameFromNameList
TypeName * makeTypeNameFromNameList(List *names)
Definition: makefuncs.c:458
makeRangeVar
RangeVar * makeRangeVar(char *schemaname, char *relname, int location)
Definition: makefuncs.c:424
pstrdup
char * pstrdup(const char *in)
Definition: mcxt.c:1624
pfree
void pfree(void *pointer)
Definition: mcxt.c:1436
TopMemoryContext
MemoryContext TopMemoryContext
Definition: mcxt.c:141
palloc0
void * palloc0(Size size)
Definition: mcxt.c:1241
MemoryContextAllocZero
void * MemoryContextAllocZero(MemoryContext context, Size size)
Definition: mcxt.c:1048
CurrentMemoryContext
MemoryContext CurrentMemoryContext
Definition: mcxt.c:135
repalloc
void * repalloc(void *pointer, Size size)
Definition: mcxt.c:1456
MemoryContextAlloc
void * MemoryContextAlloc(MemoryContext context, Size size)
Definition: mcxt.c:1005
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void * palloc(Size size)
Definition: mcxt.c:1210
MemoryContextSetIdentifier
void MemoryContextSetIdentifier(MemoryContext context, const char *id)
Definition: mcxt.c:505
AllocSetContextCreate
#define AllocSetContextCreate
Definition: memutils.h:129
ALLOCSET_DEFAULT_SIZES
#define ALLOCSET_DEFAULT_SIZES
Definition: memutils.h:153
NameListToString
char * NameListToString(List *names)
Definition: namespace.c:3145
RelnameGetRelid
Oid RelnameGetRelid(const char *relname)
Definition: namespace.c:683
RangeVarGetRelid
#define RangeVarGetRelid(relation, lockmode, missing_ok)
Definition: namespace.h:79
IsA
#define IsA(nodeptr, _type_)
Definition: nodes.h:179
makeNode
#define makeNode(_type_)
Definition: nodes.h:176
MemoryContextSwitchTo
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:138
parser_errposition
int parser_errposition(ParseState *pstate, int location)
Definition: parse_node.c:111
LookupTypeName
Type LookupTypeName(ParseState *pstate, const TypeName *typeName, int32 *typmod_p, bool missing_ok)
Definition: parse_type.c:38
parse_type.h
Form_pg_attribute
FormData_pg_attribute * Form_pg_attribute
Definition: pg_attribute.h:207
function
on_exit_nicely_callback function
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arg
void * arg
Definition: pg_backup_utils.c:27
label
static char * label
Definition: pg_basebackup.c:129
Form_pg_class
FormData_pg_class * Form_pg_class
Definition: pg_class.h:153
while
while(p+4<=pend)
Definition: pg_crc32c_sse42.c:54
llast
#define llast(l)
Definition: pg_list.h:198
list_length
static int list_length(const List *l)
Definition: pg_list.h:152
NIL
#define NIL
Definition: pg_list.h:68
lthird
#define lthird(l)
Definition: pg_list.h:188
list_make1
#define list_make1(x1)
Definition: pg_list.h:212
linitial
#define linitial(l)
Definition: pg_list.h:178
list_make3
#define list_make3(x1, x2, x3)
Definition: pg_list.h:216
lsecond
#define lsecond(l)
Definition: pg_list.h:183
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#define list_make2(x1, x2)
Definition: pg_list.h:214
function_parse_error_transpose
bool function_parse_error_transpose(const char *prosrc)
Definition: pg_proc.c:1017
pg_proc.h
Form_pg_proc
FormData_pg_proc * Form_pg_proc
Definition: pg_proc.h:136
proname
NameData proname
Definition: pg_proc.h:35
buf
static char * buf
Definition: pg_test_fsync.c:67
pg_type.h
Form_pg_type
FormData_pg_type * Form_pg_type
Definition: pg_type.h:261
ERRCODE_UNDEFINED_TABLE
#define ERRCODE_UNDEFINED_TABLE
Definition: pgbench.c:78
plpgsql_build_recfield
PLpgSQL_recfield * plpgsql_build_recfield(PLpgSQL_rec *rec, const char *fldname)
Definition: pl_comp.c:2038
add_dummy_return
static void add_dummy_return(PLpgSQL_function *function)
Definition: pl_comp.c:1036
build_row_from_vars
static PLpgSQL_row * build_row_from_vars(PLpgSQL_variable **vars, int numvars)
Definition: pl_comp.c:1971
FUNCS_PER_USER
#define FUNCS_PER_USER
Definition: pl_comp.c:70
plpgsql_parser_setup
void plpgsql_parser_setup(struct ParseState *pstate, PLpgSQL_expr *expr)
Definition: pl_comp.c:1081
plpgsql_add_initdatums
int plpgsql_add_initdatums(int **varnos)
Definition: pl_comp.c:2388
plpgsql_compile_tmp_cxt
MemoryContext plpgsql_compile_tmp_cxt
Definition: pl_comp.c:56
plpgsql_build_record
PLpgSQL_rec * plpgsql_build_record(const char *refname, int lineno, PLpgSQL_type *dtype, Oid rectypeid, bool add2namespace)
Definition: pl_comp.c:1944
make_datum_param
static Node * make_datum_param(PLpgSQL_expr *expr, int dno, int location)
Definition: pl_comp.c:1337
plpgsql_HashTableInsert
static void plpgsql_HashTableInsert(PLpgSQL_function *function, PLpgSQL_func_hashkey *func_key)
Definition: pl_comp.c:2640
plpgsql_parse_wordrowtype
PLpgSQL_type * plpgsql_parse_wordrowtype(char *ident)
Definition: pl_comp.c:1796
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int plpgsql_recognize_err_condition(const char *condname, bool allow_sqlstate)
Definition: pl_comp.c:2223
plpgsql_HashEnt
struct plpgsql_hashent plpgsql_HashEnt
plpgsql_compile_error_callback
static void plpgsql_compile_error_callback(void *arg)
Definition: pl_comp.c:984
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PLpgSQL_type * plpgsql_parse_cwordrowtype(List *idents)
Definition: pl_comp.c:1833
plpgsql_build_variable
PLpgSQL_variable * plpgsql_build_variable(const char *refname, int lineno, PLpgSQL_type *dtype, bool add2namespace)
Definition: pl_comp.c:1881
compute_function_hashkey
static void compute_function_hashkey(FunctionCallInfo fcinfo, Form_pg_proc procStruct, PLpgSQL_func_hashkey *hashkey, bool forValidator)
Definition: pl_comp.c:2446
plpgsql_HashTableInit
void plpgsql_HashTableInit(void)
Definition: pl_comp.c:2609
plpgsql_param_ref
static Node * plpgsql_param_ref(ParseState *pstate, ParamRef *pref)
Definition: pl_comp.c:1152
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static void plpgsql_start_datums(void)
Definition: pl_comp.c:2310
plpgsql_error_funcname
char * plpgsql_error_funcname
Definition: pl_comp.c:49
plpgsql_HashTableLookup
static PLpgSQL_function * plpgsql_HashTableLookup(PLpgSQL_func_hashkey *func_key)
Definition: pl_comp.c:2625
plpgsql_parse_result
PLpgSQL_stmt_block * plpgsql_parse_result
Definition: pl_comp.c:42
plpgsql_check_syntax
bool plpgsql_check_syntax
Definition: pl_comp.c:51
plpgsql_parse_err_condition
PLpgSQL_condition * plpgsql_parse_err_condition(char *condname)
Definition: pl_comp.c:2259
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static const ExceptionLabelMap exception_label_map[]
Definition: pl_comp.c:82
plpgsql_compile
PLpgSQL_function * plpgsql_compile(FunctionCallInfo fcinfo, bool forValidator)
Definition: pl_comp.c:136
do_compile
static PLpgSQL_function * do_compile(FunctionCallInfo fcinfo, HeapTuple procTup, PLpgSQL_function *function, PLpgSQL_func_hashkey *hashkey, bool forValidator)
Definition: pl_comp.c:264
plpgsql_finish_datums
static void plpgsql_finish_datums(PLpgSQL_function *function)
Definition: pl_comp.c:2344
plpgsql_curr_compile
PLpgSQL_function * plpgsql_curr_compile
Definition: pl_comp.c:53
plpgsql_parse_wordtype
PLpgSQL_type * plpgsql_parse_wordtype(char *ident)
Definition: pl_comp.c:1610
plpgsql_parse_dblword
bool plpgsql_parse_dblword(char *word1, char *word2, PLwdatum *wdatum, PLcword *cword)
Definition: pl_comp.c:1445
plpgsql_adddatum
void plpgsql_adddatum(PLpgSQL_datum *newdatum)
Definition: pl_comp.c:2327
plpgsql_Datums
PLpgSQL_datum ** plpgsql_Datums
Definition: pl_comp.c:46
plpgsql_parse_word
bool plpgsql_parse_word(char *word1, const char *yytxt, bool lookup, PLwdatum *wdatum, PLword *word)
Definition: pl_comp.c:1390
plpgsql_DumpExecTree
bool plpgsql_DumpExecTree
Definition: pl_comp.c:50
datums_last
static int datums_last
Definition: pl_comp.c:47
plpgsql_resolve_polymorphic_argtypes
static void plpgsql_resolve_polymorphic_argtypes(int numargs, Oid *argtypes, char *argmodes, Node *call_expr, bool forValidator, const char *proname)
Definition: pl_comp.c:2512
resolve_column_ref
static Node * resolve_column_ref(ParseState *pstate, PLpgSQL_expr *expr, ColumnRef *cref, bool error_if_no_field)
Definition: pl_comp.c:1179
datums_alloc
static int datums_alloc
Definition: pl_comp.c:44
add_parameter_name
static void add_parameter_name(PLpgSQL_nsitem_type itemtype, int itemno, const char *name)
Definition: pl_comp.c:1011
plpgsql_compile_inline
PLpgSQL_function * plpgsql_compile_inline(char *proc_source)
Definition: pl_comp.c:847
plpgsql_HashTableDelete
static void plpgsql_HashTableDelete(PLpgSQL_function *function)
Definition: pl_comp.c:2659
plpgsql_parse_tripword
bool plpgsql_parse_tripword(char *word1, char *word2, char *word3, PLwdatum *wdatum, PLcword *cword)
Definition: pl_comp.c:1526
build_datatype
static PLpgSQL_type * build_datatype(HeapTuple typeTup, int32 typmod, Oid collation, TypeName *origtypname)
Definition: pl_comp.c:2107
plpgsql_pre_column_ref
static Node * plpgsql_pre_column_ref(ParseState *pstate, ColumnRef *cref)
Definition: pl_comp.c:1094
delete_function
static void delete_function(PLpgSQL_function *func)
Definition: pl_comp.c:2597
plpgsql_post_column_ref
static Node * plpgsql_post_column_ref(ParseState *pstate, ColumnRef *cref, Node *var)
Definition: pl_comp.c:1108
plpgsql_parse_cwordtype
PLpgSQL_type * plpgsql_parse_cwordtype(List *idents)
Definition: pl_comp.c:1676
plpgsql_HashTable
static HTAB * plpgsql_HashTable
Definition: pl_comp.c:62
plpgsql_nDatums
int plpgsql_nDatums
Definition: pl_comp.c:45
plpgsql_build_datatype
PLpgSQL_type * plpgsql_build_datatype(Oid typeOid, int32 typmod, Oid collation, TypeName *origtypname)
Definition: pl_comp.c:2085
plpgsql_exec_get_datum_type_info
void plpgsql_exec_get_datum_type_info(PLpgSQL_execstate *estate, PLpgSQL_datum *datum, Oid *typeId, int32 *typMod, Oid *collation)
Definition: pl_exec.c:5520
plpgsql_ns_init
void plpgsql_ns_init(void)
Definition: pl_funcs.c:43
plpgsql_dumptree
void plpgsql_dumptree(PLpgSQL_function *func)
Definition: pl_funcs.c:1598
plpgsql_free_function_memory
void plpgsql_free_function_memory(PLpgSQL_function *func)
Definition: pl_funcs.c:725
plpgsql_ns_additem
void plpgsql_ns_additem(PLpgSQL_nsitem_type itemtype, int itemno, const char *name)
Definition: pl_funcs.c:92
plpgsql_ns_top
PLpgSQL_nsitem * plpgsql_ns_top(void)
Definition: pl_funcs.c:81
plpgsql_ns_push
void plpgsql_ns_push(const char *label, PLpgSQL_label_type label_type)
Definition: pl_funcs.c:54
plpgsql_ns_lookup
PLpgSQL_nsitem * plpgsql_ns_lookup(PLpgSQL_nsitem *ns_cur, bool localmode, const char *name1, const char *name2, const char *name3, int *names_used)
Definition: pl_funcs.c:130
plpgsql_variable_conflict
int plpgsql_variable_conflict
Definition: pl_handler.c:44
plpgsql_extra_warnings
int plpgsql_extra_warnings
Definition: pl_handler.c:52
plpgsql_print_strict_params
bool plpgsql_print_strict_params
Definition: pl_handler.c:46
plpgsql_extra_errors
int plpgsql_extra_errors
Definition: pl_handler.c:53
plpgsql_scanner_finish
void plpgsql_scanner_finish(void)
Definition: pl_scanner.c:613
plpgsql_IdentifierLookup
IdentifierLookup plpgsql_IdentifierLookup
Definition: pl_scanner.c:26
plpgsql_latest_lineno
int plpgsql_latest_lineno(void)
Definition: pl_scanner.c:572
plpgsql_scanner_init
void plpgsql_scanner_init(const char *str)
Definition: pl_scanner.c:586
PLPGSQL_RESOLVE_COLUMN
@ PLPGSQL_RESOLVE_COLUMN
Definition: plpgsql.h:186
PLPGSQL_RESOLVE_VARIABLE
@ PLPGSQL_RESOLVE_VARIABLE
Definition: plpgsql.h:185
PLPGSQL_DML_TRIGGER
@ PLPGSQL_DML_TRIGGER
Definition: plpgsql.h:957
PLPGSQL_NOT_TRIGGER
@ PLPGSQL_NOT_TRIGGER
Definition: plpgsql.h:959
PLPGSQL_EVENT_TRIGGER
@ PLPGSQL_EVENT_TRIGGER
Definition: plpgsql.h:958
PLpgSQL_func_hashkey
struct PLpgSQL_func_hashkey PLpgSQL_func_hashkey
PLPGSQL_STMT_RETURN
@ PLPGSQL_STMT_RETURN
Definition: plpgsql.h:115
PLPGSQL_STMT_BLOCK
@ PLPGSQL_STMT_BLOCK
Definition: plpgsql.h:104
PLPGSQL_TTYPE_PSEUDO
@ PLPGSQL_TTYPE_PSEUDO
Definition: plpgsql.h:96
PLPGSQL_TTYPE_REC
@ PLPGSQL_TTYPE_REC
Definition: plpgsql.h:95
PLPGSQL_TTYPE_SCALAR
@ PLPGSQL_TTYPE_SCALAR
Definition: plpgsql.h:94
IDENTIFIER_LOOKUP_DECLARE
@ IDENTIFIER_LOOKUP_DECLARE
Definition: plpgsql.h:1190
IDENTIFIER_LOOKUP_NORMAL
@ IDENTIFIER_LOOKUP_NORMAL
Definition: plpgsql.h:1189
PLPGSQL_PROMISE_TG_RELID
@ PLPGSQL_PROMISE_TG_RELID
Definition: plpgsql.h:80
PLPGSQL_PROMISE_TG_WHEN
@ PLPGSQL_PROMISE_TG_WHEN
Definition: plpgsql.h:77
PLPGSQL_PROMISE_TG_ARGV
@ PLPGSQL_PROMISE_TG_ARGV
Definition: plpgsql.h:84
PLPGSQL_PROMISE_TG_TABLE_SCHEMA
@ PLPGSQL_PROMISE_TG_TABLE_SCHEMA
Definition: plpgsql.h:82
PLPGSQL_PROMISE_TG_EVENT
@ PLPGSQL_PROMISE_TG_EVENT
Definition: plpgsql.h:85
PLPGSQL_PROMISE_TG_TABLE_NAME
@ PLPGSQL_PROMISE_TG_TABLE_NAME
Definition: plpgsql.h:81
PLPGSQL_PROMISE_TG_TAG
@ PLPGSQL_PROMISE_TG_TAG
Definition: plpgsql.h:86
PLPGSQL_PROMISE_TG_OP
@ PLPGSQL_PROMISE_TG_OP
Definition: plpgsql.h:79
PLPGSQL_PROMISE_TG_LEVEL
@ PLPGSQL_PROMISE_TG_LEVEL
Definition: plpgsql.h:78
PLPGSQL_PROMISE_TG_NARGS
@ PLPGSQL_PROMISE_TG_NARGS
Definition: plpgsql.h:83
PLPGSQL_PROMISE_TG_NAME
@ PLPGSQL_PROMISE_TG_NAME
Definition: plpgsql.h:76
plpgsql_yyparse
int plpgsql_yyparse(void)
PLPGSQL_LABEL_BLOCK
@ PLPGSQL_LABEL_BLOCK
Definition: plpgsql.h:53
PLPGSQL_DTYPE_ROW
@ PLPGSQL_DTYPE_ROW
Definition: plpgsql.h:64
PLPGSQL_DTYPE_PROMISE
@ PLPGSQL_DTYPE_PROMISE
Definition: plpgsql.h:67
PLPGSQL_DTYPE_RECFIELD
@ PLPGSQL_DTYPE_RECFIELD
Definition: plpgsql.h:66
PLPGSQL_DTYPE_REC
@ PLPGSQL_DTYPE_REC
Definition: plpgsql.h:65
PLPGSQL_DTYPE_VAR
@ PLPGSQL_DTYPE_VAR
Definition: plpgsql.h:63
PLpgSQL_nsitem_type
PLpgSQL_nsitem_type
Definition: plpgsql.h:42
PLPGSQL_NSTYPE_VAR
@ PLPGSQL_NSTYPE_VAR
Definition: plpgsql.h:44
PLPGSQL_NSTYPE_REC
@ PLPGSQL_NSTYPE_REC
Definition: plpgsql.h:45
snprintf
#define snprintf
Definition: port.h:238
Datum
uintptr_t Datum
Definition: postgres.h:64
ObjectIdGetDatum
static Datum ObjectIdGetDatum(Oid X)
Definition: postgres.h:252
InvalidOid
#define InvalidOid
Definition: postgres_ext.h:36
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unsigned int Oid
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Definition: syscache.h:114
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Definition: syscache.h:79
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Definition: syscache.h:89
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