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postgresql/src/backend/bootstrap/bootparse.y

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%{
/*-------------------------------------------------------------------------
*
* bootparse.y
* yacc grammar for the "bootstrap" mode (BKI file format)
*
* Portions Copyright (c) 1996-2020, 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 "bootstrap/bootstrap.h"
#include "catalog/heap.h"
#include "catalog/namespace.h"
#include "catalog/pg_am.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 "utils/memutils.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;
const char *kw;
int ival;
Oid oidval;
}
%type <list> boot_index_params
%type <ielem> boot_index_param
%type <str> boot_ident
%type <ival> optbootstrap optsharedrelation boot_column_nullness
%type <oidval> oidspec optrowtypeoid
%token <str> ID
%token COMMA EQUALS LPAREN RPAREN
/* NULLVAL is a reserved keyword */
%token NULLVAL
/* All the rest are unreserved, and should be handled in boot_ident! */
%token <kw> OPEN XCLOSE XCREATE INSERT_TUPLE
%token <kw> XDECLARE INDEX ON USING XBUILD INDICES UNIQUE XTOAST
%token <kw> OBJ_ID XBOOTSTRAP XSHARED_RELATION XROWTYPE_OID
%token <kw> XFORCE XNOT XNULL
%start TopLevel
%%
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
{
do_start();
closerel($2);
do_end();
}
;
Boot_CreateStmt:
XCREATE boot_ident oidspec optbootstrap optsharedrelation 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, 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)
{
TransactionId relfrozenxid;
MultiXactId relminmxid;
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,
HEAP_TABLE_AM_OID,
tupdesc,
RELKIND_RELATION,
RELPERSISTENCE_PERMANENT,
shared_relation,
mapped_relation,
true,
&relfrozenxid,
&relminmxid);
elog(DEBUG4, "bootstrap relation created");
}
else
{
Oid id;
id = heap_create_with_catalog($2,
PG_CATALOG_NAMESPACE,
shared_relation ? GLOBALTABLESPACE_OID : 0,
$3,
$6,
InvalidOid,
BOOTSTRAP_SUPERUSERID,
HEAP_TABLE_AM_OID,
tupdesc,
NIL,
RELKIND_RELATION,
RELPERSISTENCE_PERMANENT,
shared_relation,
mapped_relation,
ONCOMMIT_NOOP,
(Datum) 0,
false,
true,
false,
InvalidOid,
NULL);
elog(DEBUG4, "relation created with OID %u", id);
}
do_end();
}
;
Boot_InsertStmt:
INSERT_TUPLE
{
do_start();
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();
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;
elog(DEBUG4, "creating index \"%s\"", $3);
do_start();
stmt->idxname = $3;
stmt->relation = makeRangeVar(NULL, $6, -1);
stmt->accessMethod = $8;
stmt->tableSpace = NULL;
stmt->indexParams = $10;
stmt->indexIncludingParams = NIL;
stmt->options = NIL;
stmt->whereClause = NULL;
stmt->excludeOpNames = NIL;
stmt->idxcomment = NULL;
stmt->indexOid = InvalidOid;
stmt->oldNode = InvalidOid;
stmt->oldCreateSubid = InvalidSubTransactionId;
stmt->oldFirstRelfilenodeSubid = InvalidSubTransactionId;
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;
stmt->reset_default_tblspc = false;
/* locks and races need not concern us in bootstrap mode */
relationId = RangeVarGetRelid(stmt->relation, NoLock,
false);
DefineIndex(relationId,
stmt,
$4,
InvalidOid,
InvalidOid,
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;
elog(DEBUG4, "creating unique index \"%s\"", $4);
do_start();
stmt->idxname = $4;
stmt->relation = makeRangeVar(NULL, $7, -1);
stmt->accessMethod = $9;
stmt->tableSpace = NULL;
stmt->indexParams = $11;
stmt->indexIncludingParams = NIL;
stmt->options = NIL;
stmt->whereClause = NULL;
stmt->excludeOpNames = NIL;
stmt->idxcomment = NULL;
stmt->indexOid = InvalidOid;
stmt->oldNode = InvalidOid;
stmt->oldCreateSubid = InvalidSubTransactionId;
stmt->oldFirstRelfilenodeSubid = InvalidSubTransactionId;
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;
stmt->reset_default_tblspc = false;
/* locks and races need not concern us in bootstrap mode */
relationId = RangeVarGetRelid(stmt->relation, NoLock,
false);
DefineIndex(relationId,
stmt,
$5,
InvalidOid,
InvalidOid,
false,
false,
false,
true, /* skip_build */
false);
do_end();
}
;
Boot_DeclareToastStmt:
XDECLARE XTOAST oidspec oidspec ON boot_ident
{
elog(DEBUG4, "creating toast table for table \"%s\"", $6);
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; }
| { $$ = 0; }
;
optrowtypeoid:
XROWTYPE_OID oidspec { $$ = $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 { $$ = atooid($1); }
;
boot_column_val_list:
boot_column_val
| boot_column_val_list boot_column_val
| boot_column_val_list COMMA boot_column_val
;
boot_column_val:
boot_ident
{ InsertOneValue($1, num_columns_read++); }
| NULLVAL
{ InsertOneNull(num_columns_read++); }
;
boot_ident:
ID { $$ = $1; }
| OPEN { $$ = pstrdup($1); }
| XCLOSE { $$ = pstrdup($1); }
| XCREATE { $$ = pstrdup($1); }
| INSERT_TUPLE { $$ = pstrdup($1); }
| XDECLARE { $$ = pstrdup($1); }
| INDEX { $$ = pstrdup($1); }
| ON { $$ = pstrdup($1); }
| USING { $$ = pstrdup($1); }
| XBUILD { $$ = pstrdup($1); }
| INDICES { $$ = pstrdup($1); }
| UNIQUE { $$ = pstrdup($1); }
| XTOAST { $$ = pstrdup($1); }
| OBJ_ID { $$ = pstrdup($1); }
| XBOOTSTRAP { $$ = pstrdup($1); }
| XSHARED_RELATION { $$ = pstrdup($1); }
| XROWTYPE_OID { $$ = pstrdup($1); }
| XFORCE { $$ = pstrdup($1); }
| XNOT { $$ = pstrdup($1); }
| XNULL { $$ = pstrdup($1); }
;
%%
#include "bootscanner.c"
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