bootstrap.c

PostgreSQL7.4.6 for Linux

		CreateDataDirLockFile(DataDir, false);
	}

	SetProcessingMode(BootstrapProcessing);
	IgnoreSystemIndexes(true);

	XLOGPathInit();

	BaseInit();

	if (IsUnderPostmaster)
		InitDummyProcess();		/* needed to get LWLocks */

	/*
	 * XLOG operations
	 */
	SetProcessingMode(NormalProcessing);

	switch (xlogop)
	{
		case BS_XLOG_NOP:
			break;

		case BS_XLOG_BOOTSTRAP:
			BootStrapXLOG();
			StartupXLOG();
			break;

		case BS_XLOG_CHECKPOINT:
			CreateDummyCaches();
			CreateCheckPoint(false, false);
			SetSavedRedoRecPtr();		/* pass redo ptr back to
										 * postmaster */
			proc_exit(0);		/* done */

		case BS_XLOG_STARTUP:
			StartupXLOG();
			LoadFreeSpaceMap();
			proc_exit(0);		/* done */

		case BS_XLOG_SHUTDOWN:
			ShutdownXLOG();
			DumpFreeSpaceMap();
			proc_exit(0);		/* done */

		default:
			elog(PANIC, "unrecognized XLOG op: %d", xlogop);
			proc_exit(0);
	}

	SetProcessingMode(BootstrapProcessing);

	/*
	 * backend initialization
	 */
	InitPostgres(dbname, NULL);

	/*
	 * In NOP mode, all we really want to do is create shared memory and
	 * semaphores (just to prove we can do it with the current GUC
	 * settings). So, quit now.
	 */
	if (xlogop == BS_XLOG_NOP)
		proc_exit(0);

	/* Initialize stuff for bootstrap-file processing */
	for (i = 0; i < MAXATTR; i++)
	{
		attrtypes[i] = (Form_pg_attribute) NULL;
		Blanks[i] = ' ';
	}
	for (i = 0; i < STRTABLESIZE; ++i)
		strtable[i] = NULL;
	for (i = 0; i < HASHTABLESIZE; ++i)
		hashtable[i] = NULL;

	/*
	 * abort processing resumes here (this is probably dead code?)
	 */
	if (sigsetjmp(Warn_restart, 1) != 0)
	{
		Warnings++;
		AbortCurrentTransaction();
	}

	/*
	 * Process bootstrap input.
	 *
	 * the sed script boot.sed renamed yyparse to Int_yyparse for the
	 * bootstrap parser to avoid conflicts with the normal SQL parser
	 */
	Int_yyparse();

	/* Perform a checkpoint to ensure everything's down to disk */
	SetProcessingMode(NormalProcessing);
	CreateCheckPoint(true, true);
	SetProcessingMode(BootstrapProcessing);

	/* Clean up and exit */
	StartTransactionCommand();
	cleanup();

	/* not reached, here to make compiler happy */
	return 0;

}

/* ----------------------------------------------------------------
 *				MANUAL BACKEND INTERACTIVE INTERFACE COMMANDS
 * ----------------------------------------------------------------
 */

/* ----------------
 *		boot_openrel
 * ----------------
 */
void
boot_openrel(char *relname)
{
	int			i;
	struct typmap **app;
	Relation	rel;
	HeapScanDesc scan;
	HeapTuple	tup;

	if (strlen(relname) >= NAMEDATALEN - 1)
		relname[NAMEDATALEN - 1] = '\0';

	if (Typ == (struct typmap **) NULL)
	{
		rel = heap_openr(TypeRelationName, NoLock);
		scan = heap_beginscan(rel, SnapshotNow, 0, (ScanKey) NULL);
		i = 0;
		while ((tup = heap_getnext(scan, ForwardScanDirection)) != NULL)
			++i;
		heap_endscan(scan);
		app = Typ = ALLOC(struct typmap *, i + 1);
		while (i-- > 0)
			*app++ = ALLOC(struct typmap, 1);
		*app = (struct typmap *) NULL;
		scan = heap_beginscan(rel, SnapshotNow, 0, (ScanKey) NULL);
		app = Typ;
		while ((tup = heap_getnext(scan, ForwardScanDirection)) != NULL)
		{
			(*app)->am_oid = HeapTupleGetOid(tup);
			memcpy((char *) &(*app)->am_typ,
				   (char *) GETSTRUCT(tup),
				   sizeof((*app)->am_typ));
			app++;
		}
		heap_endscan(scan);
		heap_close(rel, NoLock);
	}

	if (boot_reldesc != NULL)
		closerel(NULL);

	elog(DEBUG4, "open relation %s, attrsize %d",
		 relname ? relname : "(null)",
		 (int) ATTRIBUTE_TUPLE_SIZE);

	boot_reldesc = heap_openr(relname, NoLock);
	numattr = boot_reldesc->rd_rel->relnatts;
	for (i = 0; i < numattr; i++)
	{
		if (attrtypes[i] == NULL)
			attrtypes[i] = AllocateAttribute();
		memmove((char *) attrtypes[i],
				(char *) boot_reldesc->rd_att->attrs[i],
				ATTRIBUTE_TUPLE_SIZE);

		{
			Form_pg_attribute at = attrtypes[i];

			elog(DEBUG4, "create attribute %d name %s len %d num %d type %u",
				 i, NameStr(at->attname), at->attlen, at->attnum,
				 at->atttypid);
		}
	}
}

/* ----------------
 *		closerel
 * ----------------
 */
void
closerel(char *name)
{
	if (name)
	{
		if (boot_reldesc)
		{
			if (strcmp(RelationGetRelationName(boot_reldesc), name) != 0)
				elog(ERROR, "close of %s when %s was expected",
					 name, relname ? relname : "(null)");
		}
		else
			elog(ERROR, "close of %s before any relation was opened",
				 name);
	}

	if (boot_reldesc == NULL)
		elog(ERROR, "no open relation to close");
	else
	{
		elog(DEBUG4, "close relation %s", relname ? relname : "(null)");
		heap_close(boot_reldesc, NoLock);
		boot_reldesc = (Relation) NULL;
	}
}



/* ----------------
 * DEFINEATTR()
 *
 * define a <field,type> pair
 * if there are n fields in a relation to be created, this routine
 * will be called n times
 * ----------------
 */
void
DefineAttr(char *name, char *type, int attnum)
{
	int			attlen;
	Oid			typeoid;

	if (boot_reldesc != NULL)
	{
		elog(WARNING, "no open relations allowed with CREATE command");
		closerel(relname);
	}

	if (attrtypes[attnum] == (Form_pg_attribute) NULL)
		attrtypes[attnum] = AllocateAttribute();
	MemSet(attrtypes[attnum], 0, ATTRIBUTE_TUPLE_SIZE);

	namestrcpy(&attrtypes[attnum]->attname, name);
	elog(DEBUG4, "column %s %s", NameStr(attrtypes[attnum]->attname), type);
	attrtypes[attnum]->attnum = attnum + 1;		/* fillatt */

	typeoid = gettype(type);

	if (Typ != (struct typmap **) NULL)
	{
		attrtypes[attnum]->atttypid = Ap->am_oid;
		attlen = attrtypes[attnum]->attlen = Ap->am_typ.typlen;
		attrtypes[attnum]->attbyval = Ap->am_typ.typbyval;
		attrtypes[attnum]->attstorage = Ap->am_typ.typstorage;
		attrtypes[attnum]->attalign = Ap->am_typ.typalign;
	}
	else
	{
		attrtypes[attnum]->atttypid = Procid[typeoid].oid;
		attlen = attrtypes[attnum]->attlen = Procid[typeoid].len;

		/*
		 * Cheat like mad to fill in these items from the length only.
		 * This only has to work for types that appear in Procid[].
		 */
		switch (attlen)
		{
			case 1:
				attrtypes[attnum]->attbyval = true;
				attrtypes[attnum]->attstorage = 'p';
				attrtypes[attnum]->attalign = 'c';
				break;
			case 2:
				attrtypes[attnum]->attbyval = true;
				attrtypes[attnum]->attstorage = 'p';
				attrtypes[attnum]->attalign = 's';
				break;
			case 4:
				attrtypes[attnum]->attbyval = true;
				attrtypes[attnum]->attstorage = 'p';
				attrtypes[attnum]->attalign = 'i';
				break;
			case -1:
				attrtypes[attnum]->attbyval = false;
				attrtypes[attnum]->attstorage = 'x';
				attrtypes[attnum]->attalign = 'i';
				break;
			default:
				/* TID and fixed-length arrays, such as oidvector */
				attrtypes[attnum]->attbyval = false;
				attrtypes[attnum]->attstorage = 'p';
				attrtypes[attnum]->attalign = 'i';
				break;
		}
	}
	attrtypes[attnum]->attcacheoff = -1;
	attrtypes[attnum]->atttypmod = -1;
	attrtypes[attnum]->attislocal = true;

	/*
	 * Mark as "not null" if type is fixed-width and prior columns are
	 * too. This corresponds to case where column can be accessed directly
	 * via C struct declaration.
	 */
	if (attlen > 0)
	{
		int			i;

		for (i = 0; i < attnum; i++)
		{
			if (attrtypes[i]->attlen <= 0)
				break;
		}
		if (i == attnum)
			attrtypes[attnum]->attnotnull = true;
	}
}


/* ----------------
 *		InsertOneTuple
 *
 * If objectid is not zero, it is a specific OID to assign to the tuple.
 * Otherwise, an OID will be assigned (if necessary) by heap_insert.
 * ----------------
 */
void
InsertOneTuple(Oid objectid)
{
	HeapTuple	tuple;
	TupleDesc	tupDesc;
	int			i;

	elog(DEBUG4, "inserting row oid %u, %d columns", objectid, numattr);

	tupDesc = CreateTupleDesc(numattr,
							  RelationGetForm(boot_reldesc)->relhasoids,
							  attrtypes);
	tuple = heap_formtuple(tupDesc, values, Blanks);
	if (objectid != (Oid) 0)
		HeapTupleSetOid(tuple, objectid);
	pfree(tupDesc);				/* just free's tupDesc, not the attrtypes */

	simple_heap_insert(boot_reldesc, tuple);
	heap_freetuple(tuple);
	elog(DEBUG4, "row inserted");

	/*
	 * Reset blanks for next tuple
	 */
	for (i = 0; i < numattr; i++)
		Blanks[i] = ' ';
}

/* ----------------
 *		InsertOneValue
 * ----------------
 */
void
InsertOneValue(char *value, int i)
{
	int			typeindex;
	char	   *prt;
	struct typmap **app;

	AssertArg(i >= 0 || i < MAXATTR);

	elog(DEBUG4, "inserting column %d value \"%s\"", i, value);

	if (Typ != (struct typmap **) NULL)
	{
		struct typmap *ap;

		elog(DEBUG4, "Typ != NULL");
		app = Typ;
		while (*app && (*app)->am_oid != boot_reldesc->rd_att->attrs[i]->atttypid)
			++app;
		ap = *app;
		if (ap == NULL)
		{
			elog(FATAL, "could not find atttypid %u in Typ list",
				 boot_reldesc->rd_att->attrs[i]->atttypid);
		}
		values[i] = OidFunctionCall3(ap->am_typ.typinput,
									 CStringGetDatum(value),
									 ObjectIdGetDatum(ap->am_typ.typelem),
									 Int32GetDatum(-1));
		prt = DatumGetCString(OidFunctionCall3(ap->am_typ.typoutput,
											   values[i],
									ObjectIdGetDatum(ap->am_typ.typelem),
											   Int32GetDatum(-1)));
		elog(DEBUG4, " -> %s", prt);
		pfree(prt);
	}
	else
	{
		for (typeindex = 0; typeindex < n_types; typeindex++)
		{
			if (Procid[typeindex].oid == attrtypes[i]->atttypid)
				break;
		}
		if (typeindex >= n_types)
			elog(ERROR, "type oid %u not found", attrtypes[i]->atttypid);
		elog(DEBUG4, "Typ == NULL, typeindex = %u", typeindex);
		values[i] = OidFunctionCall3(Procid[typeindex].inproc,
									 CStringGetDatum(value),
								ObjectIdGetDatum(Procid[typeindex].elem),
									 Int32GetDatum(-1));
		prt = DatumGetCString(OidFunctionCall3(Procid[typeindex].outproc,
											   values[i],
								ObjectIdGetDatum(Procid[typeindex].elem),
											   Int32GetDatum(-1)));
		elog(DEBUG4, " -> %s", prt);
		pfree(prt);
	}
	elog(DEBUG4, "inserted");
}

/* ----------------
 *		InsertOneNull
 * ----------------
 */
void
InsertOneNull(int i)
{