Re: [PATCH] Refactor: Extract XLogRecord info

Steven Niu <niushiji(at)gmail(dot)com> 于2025年6月9日周一 14:46写道：

> Hi,
>
> I like the idea of your change as it saves me out of converting-in-my-mind.
>
> And I suggest to create a macro to do this job.
> #define getRmgrInfo(info) (info & XLR_RMGR_INFO_MASK)
>
> Then the code can become:
> XLogRecGetInfo(record) & ~XLR_INFO_MASK;
> -->
> getRmgrInfo(XLogRecGetInfo(record));
>

Good idea, found lots of 'XLogRecGetInfo(record) & ~XLR_INFO_MASK;'
in the code.

I add a macro XLogRecRmgrGetInfo(record) in patch 0002.

>
> Thanks,
> Steven
>
>
> 在 2025/6/9 14:23, Xiaoran Wang 写道:
> > Hi,
> > I refactored the code of extracting XLogRecord info.
> > In XLogRecord, the high 4 bits in xl_info is used by rmgr.
> >
> > typedef struct XLogRecord
> > {
> > uint32 xl_tot_len; /* total len of entire record */
> > TransactionId xl_xid; /* xact id */
> > XLogRecPtr xl_prev; /* ptr to previous record in log */
> > uint8 xl_info; /* flag bits, see below */
> > RmgrId xl_rmid; /* resource manager for this record */
> > /* 2 bytes of padding here, initialize to zero */
> > pg_crc32c xl_crc; /* CRC for this record */
> >
> > /* XLogRecordBlockHeaders and XLogRecordDataHeader follow, no
> > padding */
> >
> > } XLogRecord;
> >
> > I found lots of the code to get the info as below
> >
> > XLogRecGetInfo(record) & ~XLR_INFO_MASK
> >
> > Actually, we can directly use XLR_RMGR_INFO_MASK(0xF0)
> > instead of XLR_INFO_MASK(0x0F), which is easier to understand.
> > Remove XLR_INFO_MASK as it is not used any more.
> >
> >
> > --
> > Best regards !
> > Xiaoran Wang
>
>
>
>

--
Best regards !
Xiaoran Wang