PostgreSQL Source Code  git master
parse_node.c File Reference
#include "postgres.h"
#include "access/htup_details.h"
#include "access/table.h"
#include "catalog/pg_type.h"
#include "mb/pg_wchar.h"
#include "nodes/makefuncs.h"
#include "nodes/miscnodes.h"
#include "nodes/nodeFuncs.h"
#include "nodes/subscripting.h"
#include "parser/parse_node.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
Include dependency graph for parse_node.c:

Go to the source code of this file.

Functions

static void pcb_error_callback (void *arg)
 
ParseStatemake_parsestate (ParseState *parentParseState)
 
void free_parsestate (ParseState *pstate)
 
int parser_errposition (ParseState *pstate, int location)
 
void setup_parser_errposition_callback (ParseCallbackState *pcbstate, ParseState *pstate, int location)
 
void cancel_parser_errposition_callback (ParseCallbackState *pcbstate)
 
void transformContainerType (Oid *containerType, int32 *containerTypmod)
 
SubscriptingReftransformContainerSubscripts (ParseState *pstate, Node *containerBase, Oid containerType, int32 containerTypMod, List *indirection, bool isAssignment)
 
Constmake_const (ParseState *pstate, A_Const *aconst)
 

Function Documentation

◆ cancel_parser_errposition_callback()

void cancel_parser_errposition_callback ( ParseCallbackState pcbstate)

◆ free_parsestate()

void free_parsestate ( ParseState pstate)

Definition at line 72 of file parse_node.c.

73 {
74  /*
75  * Check that we did not produce too many resnos; at the very least we
76  * cannot allow more than 2^16, since that would exceed the range of a
77  * AttrNumber. It seems safest to use MaxTupleAttributeNumber.
78  */
79  if (pstate->p_next_resno - 1 > MaxTupleAttributeNumber)
80  ereport(ERROR,
81  (errcode(ERRCODE_TOO_MANY_COLUMNS),
82  errmsg("target lists can have at most %d entries",
84 
85  if (pstate->p_target_relation != NULL)
87 
88  pfree(pstate);
89 }
int errcode(int sqlerrcode)
Definition: elog.c:855
int errmsg(const char *fmt,...)
Definition: elog.c:1068
#define ERROR
Definition: elog.h:39
#define ereport(elevel,...)
Definition: elog.h:149
#define MaxTupleAttributeNumber
Definition: htup_details.h:34
#define NoLock
Definition: lockdefs.h:34
void pfree(void *pointer)
Definition: mcxt.c:1521
int p_next_resno
Definition: parse_node.h:212
Relation p_target_relation
Definition: parse_node.h:207
void table_close(Relation relation, LOCKMODE lockmode)
Definition: table.c:126

References ereport, errcode(), errmsg(), ERROR, MaxTupleAttributeNumber, NoLock, ParseState::p_next_resno, ParseState::p_target_relation, pfree(), and table_close().

Referenced by AlterPolicy(), CreatePolicy(), CreateTriggerFiringOn(), inline_function(), interpret_AS_clause(), parse_analyze_fixedparams(), parse_analyze_varparams(), parse_analyze_withcb(), parse_sub_analyze(), standard_ProcessUtility(), transformIndexStmt(), transformInsertStmt(), transformJsonArrayQueryConstructor(), TransformPubWhereClauses(), transformRuleStmt(), and transformStatsStmt().

◆ make_const()

Const* make_const ( ParseState pstate,
A_Const aconst 
)

Definition at line 347 of file parse_node.c.

348 {
349  Const *con;
350  Datum val;
351  Oid typeid;
352  int typelen;
353  bool typebyval;
354  ParseCallbackState pcbstate;
355 
356  if (aconst->isnull)
357  {
358  /* return a null const */
359  con = makeConst(UNKNOWNOID,
360  -1,
361  InvalidOid,
362  -2,
363  (Datum) 0,
364  true,
365  false);
366  con->location = aconst->location;
367  return con;
368  }
369 
370  switch (nodeTag(&aconst->val))
371  {
372  case T_Integer:
373  val = Int32GetDatum(intVal(&aconst->val));
374 
375  typeid = INT4OID;
376  typelen = sizeof(int32);
377  typebyval = true;
378  break;
379 
380  case T_Float:
381  {
382  /* could be an oversize integer as well as a float ... */
383 
384  ErrorSaveContext escontext = {T_ErrorSaveContext};
385  int64 val64;
386 
387  val64 = pg_strtoint64_safe(aconst->val.fval.fval, (Node *) &escontext);
388  if (!escontext.error_occurred)
389  {
390  /*
391  * It might actually fit in int32. Probably only INT_MIN
392  * can occur, but we'll code the test generally just to be
393  * sure.
394  */
395  int32 val32 = (int32) val64;
396 
397  if (val64 == (int64) val32)
398  {
399  val = Int32GetDatum(val32);
400 
401  typeid = INT4OID;
402  typelen = sizeof(int32);
403  typebyval = true;
404  }
405  else
406  {
407  val = Int64GetDatum(val64);
408 
409  typeid = INT8OID;
410  typelen = sizeof(int64);
411  typebyval = FLOAT8PASSBYVAL; /* int8 and float8 alike */
412  }
413  }
414  else
415  {
416  /* arrange to report location if numeric_in() fails */
417  setup_parser_errposition_callback(&pcbstate, pstate, aconst->location);
419  CStringGetDatum(aconst->val.fval.fval),
421  Int32GetDatum(-1));
423 
424  typeid = NUMERICOID;
425  typelen = -1; /* variable len */
426  typebyval = false;
427  }
428  break;
429  }
430 
431  case T_Boolean:
432  val = BoolGetDatum(boolVal(&aconst->val));
433 
434  typeid = BOOLOID;
435  typelen = 1;
436  typebyval = true;
437  break;
438 
439  case T_String:
440 
441  /*
442  * We assume here that UNKNOWN's internal representation is the
443  * same as CSTRING
444  */
445  val = CStringGetDatum(strVal(&aconst->val));
446 
447  typeid = UNKNOWNOID; /* will be coerced later */
448  typelen = -2; /* cstring-style varwidth type */
449  typebyval = false;
450  break;
451 
452  case T_BitString:
453  /* arrange to report location if bit_in() fails */
454  setup_parser_errposition_callback(&pcbstate, pstate, aconst->location);
456  CStringGetDatum(aconst->val.bsval.bsval),
458  Int32GetDatum(-1));
460  typeid = BITOID;
461  typelen = -1;
462  typebyval = false;
463  break;
464 
465  default:
466  elog(ERROR, "unrecognized node type: %d", (int) nodeTag(&aconst->val));
467  return NULL; /* keep compiler quiet */
468  }
469 
470  con = makeConst(typeid,
471  -1, /* typmod -1 is OK for all cases */
472  InvalidOid, /* all cases are uncollatable types */
473  typelen,
474  val,
475  false,
476  typebyval);
477  con->location = aconst->location;
478 
479  return con;
480 }
Datum numeric_in(PG_FUNCTION_ARGS)
Definition: numeric.c:637
signed int int32
Definition: c.h:494
#define FLOAT8PASSBYVAL
Definition: c.h:635
#define elog(elevel,...)
Definition: elog.h:224
Datum Int64GetDatum(int64 X)
Definition: fmgr.c:1807
#define DirectFunctionCall3(func, arg1, arg2, arg3)
Definition: fmgr.h:646
long val
Definition: informix.c:670
Const * makeConst(Oid consttype, int32 consttypmod, Oid constcollid, int constlen, Datum constvalue, bool constisnull, bool constbyval)
Definition: makefuncs.c:301
#define nodeTag(nodeptr)
Definition: nodes.h:133
int64 pg_strtoint64_safe(const char *s, Node *escontext)
Definition: numutils.c:651
void cancel_parser_errposition_callback(ParseCallbackState *pcbstate)
Definition: parse_node.c:156
void setup_parser_errposition_callback(ParseCallbackState *pcbstate, ParseState *pstate, int location)
Definition: parse_node.c:140
uintptr_t Datum
Definition: postgres.h:64
static Datum BoolGetDatum(bool X)
Definition: postgres.h:102
static Datum ObjectIdGetDatum(Oid X)
Definition: postgres.h:252
static Datum CStringGetDatum(const char *X)
Definition: postgres.h:350
static Datum Int32GetDatum(int32 X)
Definition: postgres.h:212
#define InvalidOid
Definition: postgres_ext.h:36
unsigned int Oid
Definition: postgres_ext.h:31
bool isnull
Definition: parsenodes.h:363
union ValUnion val
Definition: parsenodes.h:362
ParseLoc location
Definition: parsenodes.h:364
char * bsval
Definition: value.h:76
bool error_occurred
Definition: miscnodes.h:46
char * fval
Definition: value.h:52
Definition: nodes.h:129
BitString bsval
Definition: parsenodes.h:354
Float fval
Definition: parsenodes.h:351
#define boolVal(v)
Definition: value.h:81
#define intVal(v)
Definition: value.h:79
#define strVal(v)
Definition: value.h:82
Datum bit_in(PG_FUNCTION_ARGS)
Definition: varbit.c:147

References bit_in(), BoolGetDatum(), boolVal, ValUnion::bsval, BitString::bsval, cancel_parser_errposition_callback(), CStringGetDatum(), DirectFunctionCall3, elog, ERROR, ErrorSaveContext::error_occurred, FLOAT8PASSBYVAL, ValUnion::fval, Float::fval, Int32GetDatum(), Int64GetDatum(), intVal, InvalidOid, A_Const::isnull, A_Const::location, makeConst(), nodeTag, numeric_in(), ObjectIdGetDatum(), pg_strtoint64_safe(), setup_parser_errposition_callback(), strVal, A_Const::val, and val.

Referenced by transformExprRecurse().

◆ make_parsestate()

ParseState* make_parsestate ( ParseState parentParseState)

Definition at line 39 of file parse_node.c.

40 {
41  ParseState *pstate;
42 
43  pstate = palloc0(sizeof(ParseState));
44 
45  pstate->parentParseState = parentParseState;
46 
47  /* Fill in fields that don't start at null/false/zero */
48  pstate->p_next_resno = 1;
49  pstate->p_resolve_unknowns = true;
50 
51  if (parentParseState)
52  {
53  pstate->p_sourcetext = parentParseState->p_sourcetext;
54  /* all hooks are copied from parent */
55  pstate->p_pre_columnref_hook = parentParseState->p_pre_columnref_hook;
56  pstate->p_post_columnref_hook = parentParseState->p_post_columnref_hook;
57  pstate->p_paramref_hook = parentParseState->p_paramref_hook;
58  pstate->p_coerce_param_hook = parentParseState->p_coerce_param_hook;
59  pstate->p_ref_hook_state = parentParseState->p_ref_hook_state;
60  /* query environment stays in context for the whole parse analysis */
61  pstate->p_queryEnv = parentParseState->p_queryEnv;
62  }
63 
64  return pstate;
65 }
void * palloc0(Size size)
Definition: mcxt.c:1347
ParseState * parentParseState
Definition: parse_node.h:192
void * p_ref_hook_state
Definition: parse_node.h:239
ParseParamRefHook p_paramref_hook
Definition: parse_node.h:237
PreParseColumnRefHook p_pre_columnref_hook
Definition: parse_node.h:235
QueryEnvironment * p_queryEnv
Definition: parse_node.h:220
const char * p_sourcetext
Definition: parse_node.h:193
bool p_resolve_unknowns
Definition: parse_node.h:217
CoerceParamHook p_coerce_param_hook
Definition: parse_node.h:238
PostParseColumnRefHook p_post_columnref_hook
Definition: parse_node.h:236

References ParseState::p_coerce_param_hook, ParseState::p_next_resno, ParseState::p_paramref_hook, ParseState::p_post_columnref_hook, ParseState::p_pre_columnref_hook, ParseState::p_queryEnv, ParseState::p_ref_hook_state, ParseState::p_resolve_unknowns, ParseState::p_sourcetext, palloc0(), and ParseState::parentParseState.

Referenced by AddRelationNewConstraints(), AlterDomainDefault(), AlterPolicy(), ATExecAttachPartition(), ATPrepAlterColumnType(), convert_ANY_sublink_to_join(), copy_table(), CreatePolicy(), CreateTriggerFiringOn(), DefineDomain(), DefineRelation(), domainAddCheckConstraint(), ExplainExecuteQuery(), inline_function(), interpret_AS_clause(), parse_analyze_fixedparams(), parse_analyze_varparams(), parse_analyze_withcb(), parse_sub_analyze(), rewriteTargetView(), standard_ProcessUtility(), test_rls_hooks_permissive(), test_rls_hooks_restrictive(), transformAlterTableStmt(), transformCreateStmt(), transformIndexStmt(), transformInsertStmt(), transformJsonArrayQueryConstructor(), transformPartitionSpec(), TransformPubWhereClauses(), transformRuleStmt(), and transformStatsStmt().

◆ parser_errposition()

int parser_errposition ( ParseState pstate,
int  location 
)

Definition at line 106 of file parse_node.c.

107 {
108  int pos;
109 
110  /* No-op if location was not provided */
111  if (location < 0)
112  return 0;
113  /* Can't do anything if source text is not available */
114  if (pstate == NULL || pstate->p_sourcetext == NULL)
115  return 0;
116  /* Convert offset to character number */
117  pos = pg_mbstrlen_with_len(pstate->p_sourcetext, location) + 1;
118  /* And pass it to the ereport mechanism */
119  return errposition(pos);
120 }
int errposition(int cursorpos)
Definition: elog.c:1444
int pg_mbstrlen_with_len(const char *mbstr, int limit)
Definition: mbutils.c:1057

References errposition(), ParseState::p_sourcetext, and pg_mbstrlen_with_len().

Referenced by addRangeTableEntryForCTE(), addRangeTableEntryForFunction(), addRangeTableEntryForTableFunc(), AlterDatabase(), analyzeCTE(), analyzeCTETargetList(), array_subscript_transform(), assign_collations_walker(), assign_hypothetical_collations(), check_agg_arguments(), check_agg_arguments_walker(), check_agglevels_and_constraints(), check_lateral_ref_ok(), check_nested_generated_walker(), check_new_partition_bound(), check_parameter_resolution_walker(), check_partition_bounds_for_split_list(), check_partition_bounds_for_split_range(), check_partitions_for_split(), check_partitions_not_overlap_list(), check_simple_rowfilter_expr_walker(), check_srf_call_placement(), check_two_partitions_bounds_range(), check_ungrouped_columns_walker(), CheckDuplicateColumnOrPathNames(), checkExprIsVarFree(), checkInsertTargets(), checkJsonOutputFormat(), checkTargetlistEntrySQL92(), checkWellFormedRecursion(), checkWellFormedRecursionWalker(), cluster(), coerce_to_boolean(), coerce_to_common_type(), coerce_to_specific_type_typmod(), colNameToVar(), compatible_oper(), compute_common_attribute(), compute_function_attributes(), ComputePartitionAttrs(), createdb(), CreateTriggerFiringOn(), defGetCopyLogVerbosityChoice(), defGetCopyOnErrorChoice(), DefineCollation(), DefineType(), DropDatabase(), errorConflictingDefElem(), errorMissingColumn(), errorMissingRTE(), EvaluateParams(), ExecReindex(), ExecVacuum(), ExpandAllTables(), ExpandColumnRefStar(), ExplainQuery(), finalize_grouping_exprs_walker(), findTargetlistEntrySQL92(), fixed_paramref_hook(), GetColumnDefCollation(), GrantRole(), hstore_subscript_transform(), init_params(), jsonb_subscript_transform(), LookupOperName(), LookupTypeNameExtended(), LookupTypeNameOid(), make_distinct_op(), make_op(), make_row_comparison_op(), make_row_distinct_op(), make_scalar_array_op(), merge_collation_state(), op_error(), parseCheckAggregates(), ParseFuncOrColumn(), parser_coercion_errposition(), pcb_error_callback(), plpgsql_post_column_ref(), ProcessCopyOptions(), resolve_column_ref(), resolve_unique_index_expr(), scanNameSpaceForRefname(), scanNameSpaceForRelid(), scanNSItemForColumn(), scanRTEForColumn(), select_common_collation(), select_common_type(), TopologicalSort(), transformAExprNullIf(), transformAggregateCall(), transformArrayExpr(), transformAssignedExpr(), transformAssignmentIndirection(), transformAssignmentSubscripts(), transformCaseExpr(), transformCoalesceExpr(), transformCollateClause(), transformColumnDefinition(), transformColumnRef(), transformColumnType(), transformConstraintAttrs(), transformContainerSubscripts(), transformDistinctClause(), transformDistinctOnClause(), transformExprRecurse(), transformFrameOffset(), transformFromClauseItem(), transformGroupingFunc(), transformGroupingSet(), transformIndexConstraint(), transformIndirection(), transformInsertRow(), transformJsonAggConstructor(), transformJsonArrayQueryConstructor(), transformJsonBehavior(), transformJsonFuncExpr(), transformJsonParseArg(), transformJsonParseExpr(), transformJsonReturning(), transformJsonTable(), transformJsonTableColumns(), transformJsonValueExpr(), transformLockingClause(), transformMergeSupportFunc(), transformMultiAssignRef(), transformOnConflictArbiter(), transformParamRef(), transformPartitionBound(), transformPartitionBoundValue(), transformPartitionCmdForMerge(), transformPLAssignStmt(), transformRangeFunction(), transformRangeTableFunc(), transformRangeTableSample(), transformReturningList(), transformRowExpr(), transformSelectStmt(), transformSetOperationStmt(), transformSetOperationTree(), transformSubLink(), transformTableConstraint(), transformUpdateTargetList(), transformValuesClause(), transformWindowDefinitions(), transformWindowFuncCall(), transformWithClause(), transformXmlExpr(), transformXmlSerialize(), typenameType(), typenameTypeMod(), unknown_attribute(), validateInfiniteBounds(), variable_coerce_param_hook(), and variable_paramref_hook().

◆ pcb_error_callback()

static void pcb_error_callback ( void *  arg)
static

Definition at line 170 of file parse_node.c.

171 {
172  ParseCallbackState *pcbstate = (ParseCallbackState *) arg;
173 
174  if (geterrcode() != ERRCODE_QUERY_CANCELED)
175  (void) parser_errposition(pcbstate->pstate, pcbstate->location);
176 }
int geterrcode(void)
Definition: elog.c:1559
int parser_errposition(ParseState *pstate, int location)
Definition: parse_node.c:106
void * arg
ParseState * pstate
Definition: parse_node.h:334

References arg, geterrcode(), ParseCallbackState::location, parser_errposition(), and ParseCallbackState::pstate.

Referenced by setup_parser_errposition_callback().

◆ setup_parser_errposition_callback()

void setup_parser_errposition_callback ( ParseCallbackState pcbstate,
ParseState pstate,
int  location 
)

◆ transformContainerSubscripts()

SubscriptingRef* transformContainerSubscripts ( ParseState pstate,
Node containerBase,
Oid  containerType,
int32  containerTypMod,
List indirection,
bool  isAssignment 
)

Definition at line 243 of file parse_node.c.

249 {
250  SubscriptingRef *sbsref;
251  const SubscriptRoutines *sbsroutines;
252  Oid elementType;
253  bool isSlice = false;
254  ListCell *idx;
255 
256  /*
257  * Determine the actual container type, smashing any domain. In the
258  * assignment case the caller already did this, since it also needs to
259  * know the actual container type.
260  */
261  if (!isAssignment)
262  transformContainerType(&containerType, &containerTypMod);
263 
264  /*
265  * Verify that the container type is subscriptable, and get its support
266  * functions and typelem.
267  */
268  sbsroutines = getSubscriptingRoutines(containerType, &elementType);
269  if (!sbsroutines)
270  ereport(ERROR,
271  (errcode(ERRCODE_DATATYPE_MISMATCH),
272  errmsg("cannot subscript type %s because it does not support subscripting",
273  format_type_be(containerType)),
274  parser_errposition(pstate, exprLocation(containerBase))));
275 
276  /*
277  * Detect whether any of the indirection items are slice specifiers.
278  *
279  * A list containing only simple subscripts refers to a single container
280  * element. If any of the items are slice specifiers (lower:upper), then
281  * the subscript expression means a container slice operation.
282  */
283  foreach(idx, indirection)
284  {
286 
287  if (ai->is_slice)
288  {
289  isSlice = true;
290  break;
291  }
292  }
293 
294  /*
295  * Ready to build the SubscriptingRef node.
296  */
297  sbsref = makeNode(SubscriptingRef);
298 
299  sbsref->refcontainertype = containerType;
300  sbsref->refelemtype = elementType;
301  /* refrestype is to be set by container-specific logic */
302  sbsref->reftypmod = containerTypMod;
303  /* refcollid will be set by parse_collate.c */
304  /* refupperindexpr, reflowerindexpr are to be set by container logic */
305  sbsref->refexpr = (Expr *) containerBase;
306  sbsref->refassgnexpr = NULL; /* caller will fill if it's an assignment */
307 
308  /*
309  * Call the container-type-specific logic to transform the subscripts and
310  * determine the subscripting result type.
311  */
312  sbsroutines->transform(sbsref, indirection, pstate,
313  isSlice, isAssignment);
314 
315  /*
316  * Verify we got a valid type (this defends, for example, against someone
317  * using array_subscript_handler as typsubscript without setting typelem).
318  */
319  if (!OidIsValid(sbsref->refrestype))
320  ereport(ERROR,
321  (errcode(ERRCODE_DATATYPE_MISMATCH),
322  errmsg("cannot subscript type %s because it does not support subscripting",
323  format_type_be(containerType))));
324 
325  return sbsref;
326 }
Datum idx(PG_FUNCTION_ARGS)
Definition: _int_op.c:259
#define OidIsValid(objectId)
Definition: c.h:775
char * format_type_be(Oid type_oid)
Definition: format_type.c:343
const struct SubscriptRoutines * getSubscriptingRoutines(Oid typid, Oid *typelemp)
Definition: lsyscache.c:3130
int exprLocation(const Node *expr)
Definition: nodeFuncs.c:1380
#define makeNode(_type_)
Definition: nodes.h:155
void transformContainerType(Oid *containerType, int32 *containerTypmod)
Definition: parse_node.c:189
#define lfirst_node(type, lc)
Definition: pg_list.h:176
bool is_slice
Definition: parsenodes.h:459
SubscriptTransform transform
Definition: subscripting.h:160
Expr * refassgnexpr
Definition: primnodes.h:703
Expr * refexpr
Definition: primnodes.h:701

References ereport, errcode(), errmsg(), ERROR, exprLocation(), format_type_be(), getSubscriptingRoutines(), idx(), A_Indices::is_slice, lfirst_node, makeNode, OidIsValid, parser_errposition(), SubscriptingRef::refassgnexpr, SubscriptingRef::refexpr, SubscriptRoutines::transform, and transformContainerType().

Referenced by transformAssignmentSubscripts(), and transformIndirection().

◆ transformContainerType()

void transformContainerType ( Oid containerType,
int32 containerTypmod 
)

Definition at line 189 of file parse_node.c.

190 {
191  /*
192  * If the input is a domain, smash to base type, and extract the actual
193  * typmod to be applied to the base type. Subscripting a domain is an
194  * operation that necessarily works on the base container type, not the
195  * domain itself. (Note that we provide no method whereby the creator of a
196  * domain over a container type could hide its ability to be subscripted.)
197  */
198  *containerType = getBaseTypeAndTypmod(*containerType, containerTypmod);
199 
200  /*
201  * We treat int2vector and oidvector as though they were domains over
202  * int2[] and oid[]. This is needed because array slicing could create an
203  * array that doesn't satisfy the dimensionality constraints of the
204  * xxxvector type; so we want the result of a slice operation to be
205  * considered to be of the more general type.
206  */
207  if (*containerType == INT2VECTOROID)
208  *containerType = INT2ARRAYOID;
209  else if (*containerType == OIDVECTOROID)
210  *containerType = OIDARRAYOID;
211 }
Oid getBaseTypeAndTypmod(Oid typid, int32 *typmod)
Definition: lsyscache.c:2538

References getBaseTypeAndTypmod().

Referenced by transformAssignmentSubscripts(), and transformContainerSubscripts().