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postgres/src/backend/bootstrap/bootparse.y
Tom Lane 0d18852666 Disallow CREATE INDEX if table is already in use in current session. 
If we allow this, whatever outer command has the table open will not know
about the new index and may fail to update it as needed, as shown in a
report from Laurenz Albe.  We already had such a prohibition in place for
ALTER TABLE, but the CREATE INDEX syntax missed the check.

Fixing it requires an API change for DefineIndex(), which conceivably
would break third-party extensions if we were to back-patch it.  Given
how long this problem has existed without being noticed, fixing it in
the back branches doesn't seem worth that risk.

Discussion: https://postgr.es/m/A737B7A37273E048B164557ADEF4A58B53A4DC9A@ntex2010i.host.magwien.gv.at
2017-06-04 12:02:41 -04:00

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%{
/*-------------------------------------------------------------------------
*
* bootparse.y
* yacc grammar for the "bootstrap" mode (BKI file format)
*
* Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/backend/bootstrap/bootparse.y
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <unistd.h>
#include "access/attnum.h"
#include "access/htup.h"
#include "access/itup.h"
#include "access/tupdesc.h"
#include "bootstrap/bootstrap.h"
#include "catalog/catalog.h"
#include "catalog/heap.h"
#include "catalog/namespace.h"
#include "catalog/pg_am.h"
#include "catalog/pg_attribute.h"
#include "catalog/pg_authid.h"
#include "catalog/pg_class.h"
#include "catalog/pg_namespace.h"
#include "catalog/pg_tablespace.h"
#include "catalog/toasting.h"
#include "commands/defrem.h"
#include "miscadmin.h"
#include "nodes/makefuncs.h"
#include "nodes/nodes.h"
#include "nodes/parsenodes.h"
#include "nodes/pg_list.h"
#include "nodes/primnodes.h"
#include "rewrite/prs2lock.h"
#include "storage/block.h"
#include "storage/fd.h"
#include "storage/ipc.h"
#include "storage/itemptr.h"
#include "storage/off.h"
#include "storage/smgr.h"
#include "tcop/dest.h"
#include "utils/memutils.h"
#include "utils/rel.h"
/*
* Bison doesn't allocate anything that needs to live across parser calls,
* so we can easily have it use palloc instead of malloc. This prevents
* memory leaks if we error out during parsing. Note this only works with
* bison >= 2.0. However, in bison 1.875 the default is to use alloca()
* if possible, so there's not really much problem anyhow, at least if
* you're building with gcc.
*/
#define YYMALLOC palloc
#define YYFREE pfree
static MemoryContext per_line_ctx = NULL;
static void
do_start(void)
{
Assert(CurrentMemoryContext == CurTransactionContext);
/* First time through, create the per-line working context */
if (per_line_ctx == NULL)
per_line_ctx = AllocSetContextCreate(CurTransactionContext,
"bootstrap per-line processing",
ALLOCSET_DEFAULT_SIZES);
MemoryContextSwitchTo(per_line_ctx);
}
static void
do_end(void)
{
/* Reclaim memory allocated while processing this line */
MemoryContextSwitchTo(CurTransactionContext);
MemoryContextReset(per_line_ctx);
CHECK_FOR_INTERRUPTS(); /* allow SIGINT to kill bootstrap run */
if (isatty(0))
{
printf("bootstrap> ");
fflush(stdout);
}
}
static int num_columns_read = 0;
%}
%expect 0
%name-prefix="boot_yy"
%union
{
List *list;
IndexElem *ielem;
char *str;
int ival;
Oid oidval;
}
%type <list> boot_index_params
%type <ielem> boot_index_param
%type <str> boot_ident
%type <ival> optbootstrap optsharedrelation optwithoutoids boot_column_nullness
%type <oidval> oidspec optoideq optrowtypeoid
%token <str> ID
%token OPEN XCLOSE XCREATE INSERT_TUPLE
%token XDECLARE INDEX ON USING XBUILD INDICES UNIQUE XTOAST
%token COMMA EQUALS LPAREN RPAREN
%token OBJ_ID XBOOTSTRAP XSHARED_RELATION XWITHOUT_OIDS XROWTYPE_OID NULLVAL
%token XFORCE XNOT XNULL
%start TopLevel
%nonassoc low
%nonassoc high
%%
TopLevel:
Boot_Queries
|
;
Boot_Queries:
Boot_Query
| Boot_Queries Boot_Query
;
Boot_Query :
Boot_OpenStmt
| Boot_CloseStmt
| Boot_CreateStmt
| Boot_InsertStmt
| Boot_DeclareIndexStmt
| Boot_DeclareUniqueIndexStmt
| Boot_DeclareToastStmt
| Boot_BuildIndsStmt
;
Boot_OpenStmt:
OPEN boot_ident
{
do_start();
boot_openrel($2);
do_end();
}
;
Boot_CloseStmt:
XCLOSE boot_ident %prec low
{
do_start();
closerel($2);
do_end();
}
| XCLOSE %prec high
{
do_start();
closerel(NULL);
do_end();
}
;
Boot_CreateStmt:
XCREATE boot_ident oidspec optbootstrap optsharedrelation optwithoutoids optrowtypeoid LPAREN
{
do_start();
numattr = 0;
elog(DEBUG4, "creating%s%s relation %s %u",
$4 ? " bootstrap" : "",
$5 ? " shared" : "",
$2,
$3);
}
boot_column_list
{
do_end();
}
RPAREN
{
TupleDesc tupdesc;
bool shared_relation;
bool mapped_relation;
do_start();
tupdesc = CreateTupleDesc(numattr, !($6), attrtypes);
shared_relation = $5;
/*
* The catalogs that use the relation mapper are the
* bootstrap catalogs plus the shared catalogs. If this
* ever gets more complicated, we should invent a BKI
* keyword to mark the mapped catalogs, but for now a
* quick hack seems the most appropriate thing. Note in
* particular that all "nailed" heap rels (see formrdesc
* in relcache.c) must be mapped.
*/
mapped_relation = ($4 || shared_relation);
if ($4)
{
if (boot_reldesc)
{
elog(DEBUG4, "create bootstrap: warning, open relation exists, closing first");
closerel(NULL);
}
boot_reldesc = heap_create($2,
PG_CATALOG_NAMESPACE,
shared_relation ? GLOBALTABLESPACE_OID : 0,
$3,
InvalidOid,
tupdesc,
RELKIND_RELATION,
RELPERSISTENCE_PERMANENT,
shared_relation,
mapped_relation,
true);
elog(DEBUG4, "bootstrap relation created");
}
else
{
Oid id;
id = heap_create_with_catalog($2,
PG_CATALOG_NAMESPACE,
shared_relation ? GLOBALTABLESPACE_OID : 0,
$3,
$7,
InvalidOid,
BOOTSTRAP_SUPERUSERID,
tupdesc,
NIL,
RELKIND_RELATION,
RELPERSISTENCE_PERMANENT,
shared_relation,
mapped_relation,
true,
0,
ONCOMMIT_NOOP,
(Datum) 0,
false,
true,
false,
NULL);
elog(DEBUG4, "relation created with OID %u", id);
}
do_end();
}
;
Boot_InsertStmt:
INSERT_TUPLE optoideq
{
do_start();
if ($2)
elog(DEBUG4, "inserting row with oid %u", $2);
else
elog(DEBUG4, "inserting row");
num_columns_read = 0;
}
LPAREN boot_column_val_list RPAREN
{
if (num_columns_read != numattr)
elog(ERROR, "incorrect number of columns in row (expected %d, got %d)",
numattr, num_columns_read);
if (boot_reldesc == NULL)
elog(FATAL, "relation not open");
InsertOneTuple($2);
do_end();
}
;
Boot_DeclareIndexStmt:
XDECLARE INDEX boot_ident oidspec ON boot_ident USING boot_ident LPAREN boot_index_params RPAREN
{
IndexStmt *stmt = makeNode(IndexStmt);
Oid relationId;
do_start();
stmt->idxname = $3;
stmt->relation = makeRangeVar(NULL, $6, -1);
stmt->accessMethod = $8;
stmt->tableSpace = NULL;
stmt->indexParams = $10;
stmt->options = NIL;
stmt->whereClause = NULL;
stmt->excludeOpNames = NIL;
stmt->idxcomment = NULL;
stmt->indexOid = InvalidOid;
stmt->oldNode = InvalidOid;
stmt->unique = false;
stmt->primary = false;
stmt->isconstraint = false;
stmt->deferrable = false;
stmt->initdeferred = false;
stmt->transformed = false;
stmt->concurrent = false;
stmt->if_not_exists = false;
/* locks and races need not concern us in bootstrap mode */
relationId = RangeVarGetRelid(stmt->relation, NoLock,
false);
DefineIndex(relationId,
stmt,
$4,
false,
false,
false,
true, /* skip_build */
false);
do_end();
}
;
Boot_DeclareUniqueIndexStmt:
XDECLARE UNIQUE INDEX boot_ident oidspec ON boot_ident USING boot_ident LPAREN boot_index_params RPAREN
{
IndexStmt *stmt = makeNode(IndexStmt);
Oid relationId;
do_start();
stmt->idxname = $4;
stmt->relation = makeRangeVar(NULL, $7, -1);
stmt->accessMethod = $9;
stmt->tableSpace = NULL;
stmt->indexParams = $11;
stmt->options = NIL;
stmt->whereClause = NULL;
stmt->excludeOpNames = NIL;
stmt->idxcomment = NULL;
stmt->indexOid = InvalidOid;
stmt->oldNode = InvalidOid;
stmt->unique = true;
stmt->primary = false;
stmt->isconstraint = false;
stmt->deferrable = false;
stmt->initdeferred = false;
stmt->transformed = false;
stmt->concurrent = false;
stmt->if_not_exists = false;
/* locks and races need not concern us in bootstrap mode */
relationId = RangeVarGetRelid(stmt->relation, NoLock,
false);
DefineIndex(relationId,
stmt,
$5,
false,
false,
false,
true, /* skip_build */
false);
do_end();
}
;
Boot_DeclareToastStmt:
XDECLARE XTOAST oidspec oidspec ON boot_ident
{
do_start();
BootstrapToastTable($6, $3, $4);
do_end();
}
;
Boot_BuildIndsStmt:
XBUILD INDICES
{
do_start();
build_indices();
do_end();
}
;
boot_index_params:
boot_index_params COMMA boot_index_param { $$ = lappend($1, $3); }
| boot_index_param { $$ = list_make1($1); }
;
boot_index_param:
boot_ident boot_ident
{
IndexElem *n = makeNode(IndexElem);
n->name = $1;
n->expr = NULL;
n->indexcolname = NULL;
n->collation = NIL;
n->opclass = list_make1(makeString($2));
n->ordering = SORTBY_DEFAULT;
n->nulls_ordering = SORTBY_NULLS_DEFAULT;
$$ = n;
}
;
optbootstrap:
XBOOTSTRAP { $$ = 1; }
| { $$ = 0; }
;
optsharedrelation:
XSHARED_RELATION { $$ = 1; }
| { $$ = 0; }
;
optwithoutoids:
XWITHOUT_OIDS { $$ = 1; }
| { $$ = 0; }
;
optrowtypeoid:
XROWTYPE_OID oidspec { $$ = $2; }
| { $$ = InvalidOid; }
;
boot_column_list:
boot_column_def
| boot_column_list COMMA boot_column_def
;
boot_column_def:
boot_ident EQUALS boot_ident boot_column_nullness
{
if (++numattr > MAXATTR)
elog(FATAL, "too many columns");
DefineAttr($1, $3, numattr-1, $4);
}
;
boot_column_nullness:
XFORCE XNOT XNULL { $$ = BOOTCOL_NULL_FORCE_NOT_NULL; }
| XFORCE XNULL { $$ = BOOTCOL_NULL_FORCE_NULL; }
| { $$ = BOOTCOL_NULL_AUTO; }
;
oidspec:
boot_ident { $$ = atooid($1); }
;
optoideq:
OBJ_ID EQUALS oidspec { $$ = $3; }
| { $$ = InvalidOid; }
;
boot_column_val_list:
boot_column_val
| boot_column_val_list boot_column_val
| boot_column_val_list COMMA boot_column_val
;
boot_column_val:
boot_ident
{ InsertOneValue($1, num_columns_read++); }
| NULLVAL
{ InsertOneNull(num_columns_read++); }
;
boot_ident :
ID { $$ = yylval.str; }
;
%%
#include "bootscanner.c"
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