数据库系统

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bootparse.y：源码内容
							%{
/*-------------------------------------------------------------------------
 *
 * backendparse.y
 *	  yacc parser grammer for the "backend" initialization program.
 *
 * Copyright (c) 1994, Regents of the University of California
 *
 *
 * IDENTIFICATION
 *	  $Header: /usr/local/cvsroot/pgsql/src/backend/bootstrap/bootparse.y,v 1.25.2.1 1999/08/02 05:56:51 scrappy Exp $
 *
 *-------------------------------------------------------------------------
 */
#include <time.h>
#include "postgres.h"
#include "access/attnum.h"
#include "access/funcindex.h"
#include "access/htup.h"
#include "access/itup.h"
#include "access/skey.h"
#include "access/strat.h"
#include "access/tupdesc.h"
#include "access/xact.h"
#include "bootstrap/bootstrap.h"
#include "catalog/heap.h"
#include "catalog/pg_am.h"
#include "catalog/pg_attribute.h"
#include "catalog/pg_class.h"
#include "commands/defrem.h"
#include "miscadmin.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 "storage/spin.h"
#include "tcop/dest.h"
#include "utils/nabstime.h"
#include "utils/rel.h"
#define DO_START { 
					StartTransactionCommand();
				 }
#define DO_END	 { 
					CommitTransactionCommand();
					if (!Quiet) { EMITPROMPT; }
						fflush(stdout); 
				 }
int num_tuples_read = 0;
static Oid objectid;
%}
%union
{
	List		*list;
	IndexElem	*ielem;
	char		*str;
	int			ival;
}
%type <list>  boot_index_params
%type <ielem> boot_index_param
%type <ival> boot_const boot_ident
%type <ival> optbootstrap optoideq boot_tuple boot_tuplelist
%token <ival> CONST ID
%token OPEN XCLOSE XCREATE INSERT_TUPLE
%token STRING XDEFINE
%token XDECLARE INDEX ON USING XBUILD INDICES
%token COMMA EQUALS LPAREN RPAREN
%token OBJ_ID XBOOTSTRAP NULLVAL
%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_BuildIndsStmt
		;
Boot_OpenStmt:
		  OPEN boot_ident
				{
					DO_START;
					boot_openrel(LexIDStr($2));
					DO_END;
				}
		;
Boot_CloseStmt:
		  XCLOSE boot_ident %prec low
				{
					DO_START;
					closerel(LexIDStr($2));
					DO_END;
				}
		| XCLOSE %prec high
				{
					DO_START;
					closerel(NULL);
					DO_END;
				}
		;
Boot_CreateStmt:
		  XCREATE optbootstrap boot_ident LPAREN
				{
					DO_START;
					numattr=(int)0;
				}
		  boot_typelist
				{
					if (!Quiet)
						putchar('n');
					DO_END;
				}
		  RPAREN
				{
					DO_START;
					if ($2)
					{
						extern Relation reldesc;
						TupleDesc tupdesc;
						if (reldesc)
						{
							puts("create bootstrap: Warning, open relation");
							puts("exists, closing first");
							closerel(NULL);
						}
						if (DebugMode)
							puts("creating bootstrap relation");
						tupdesc = CreateTupleDesc(numattr,attrtypes);
						reldesc = heap_create(LexIDStr($3), tupdesc,
											  false, false);
						if (DebugMode)
							puts("bootstrap relation created ok");
					}
					else
					{
						Oid id;
						TupleDesc tupdesc;
						tupdesc = CreateTupleDesc(numattr,attrtypes);
						id = heap_create_with_catalog(LexIDStr($3),
											tupdesc, RELKIND_RELATION, false);
						if (!Quiet)
							printf("CREATED relation %s with OID %un",
								   LexIDStr($3), id);
					}
					DO_END;
					if (DebugMode)
						puts("Commit End");
				}
		;
Boot_InsertStmt:
		  INSERT_TUPLE optoideq
				{
					DO_START;
					if (DebugMode)
						printf("tuple %d<", $2);
					num_tuples_read = 0;
				}
		  LPAREN  boot_tuplelist RPAREN
				{
					if (num_tuples_read != numattr)
						elog(ERROR,"incorrect number of values for tuple");
					if (reldesc == (Relation)NULL)
					{
						elog(ERROR,"must OPEN RELATION before INSERTn");
						err_out();
					}
					if (DebugMode)
						puts("Insert Begin");
					objectid = $2;
					InsertOneTuple(objectid);
					if (DebugMode)
						puts("Insert End");
					if (!Quiet)
						putchar('n');
					DO_END;
					if (DebugMode)
						puts("Transaction End");
				}
		;
Boot_DeclareIndexStmt:
		  XDECLARE INDEX boot_ident ON boot_ident USING boot_ident LPAREN boot_index_params RPAREN
				{
					DO_START;
					DefineIndex(LexIDStr($5),
								LexIDStr($3),
								LexIDStr($7),
								$9, NIL, 0, 0, 0, NIL);
					DO_END;
				}
		;
Boot_BuildIndsStmt:
		  XBUILD INDICES		{ build_indices(); }
boot_index_params:
		boot_index_params COMMA boot_index_param	{ $$ = lappend($1, $3); }
		| boot_index_param							{ $$ = lcons($1, NIL); }
		;
boot_index_param:
		boot_ident boot_ident
				{
					IndexElem *n = makeNode(IndexElem);
					n->name = LexIDStr($1);
					n->class = LexIDStr($2);
					$$ = n;
				}
optbootstrap:
			XBOOTSTRAP	{ $$ = 1; }
		|				{ $$ = 0; }
		;
boot_typelist:
		  boot_type_thing
		| boot_typelist COMMA boot_type_thing
		;
boot_type_thing:
		  boot_ident EQUALS boot_ident
				{
				   if(++numattr > MAXATTR)
						elog(FATAL,"Too many attributesn");
				   DefineAttr(LexIDStr($1),LexIDStr($3),numattr-1);
				   if (DebugMode)
					   printf("n");
				}
		;
optoideq:
			OBJ_ID EQUALS boot_ident { $$ = atol(LexIDStr($3));				}
		|						{ extern Oid newoid(); $$ = newoid();	}
		;
boot_tuplelist:
		   boot_tuple
		|  boot_tuplelist boot_tuple
		|  boot_tuplelist COMMA boot_tuple
		;
boot_tuple:
		  boot_ident {InsertOneValue(objectid, LexIDStr($1), num_tuples_read++); }
		| boot_const {InsertOneValue(objectid, LexIDStr($1), num_tuples_read++); }
		| NULLVAL
			{ InsertOneNull(num_tuples_read++); }
		;
boot_const :
		  CONST { $$=yylval.ival; }
		;
boot_ident :
		  ID	{ $$=yylval.ival; }
		;
%%

						