Tom Lane wrote:
> Alvaro Herrera <alvhe...@2ndquadrant.com> writes:
> > The
> > approach in the second patch is to turn these into "extern const RmgrId"
> > instead, and use a second inclusion of rmgrlist.h in rmgr.c that assigns
> > them the values as consts.
>
> ... but I don't especially like that implementation, as it will result
> in nonzero code bloat and runtime cost due to replacing all those
> constants with global-variable references. Couldn't you instead set it
> up as an enum definition?
That seems to work. I would like to have some way of specifying that
the enum members should be of type RmgrId, but I don't think there's any
way to do that.
Patch attached.
--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
*** a/src/backend/access/transam/rmgr.c
--- b/src/backend/access/transam/rmgr.c
***************
*** 24,46 ****
#include "storage/standby.h"
#include "utils/relmapper.h"
const RmgrData RmgrTable[RM_MAX_ID + 1] = {
! {"XLOG", xlog_redo, xlog_desc, NULL, NULL, NULL},
! {"Transaction", xact_redo, xact_desc, NULL, NULL, NULL},
! {"Storage", smgr_redo, smgr_desc, NULL, NULL, NULL},
! {"CLOG", clog_redo, clog_desc, NULL, NULL, NULL},
! {"Database", dbase_redo, dbase_desc, NULL, NULL, NULL},
! {"Tablespace", tblspc_redo, tblspc_desc, NULL, NULL, NULL},
! {"MultiXact", multixact_redo, multixact_desc, NULL, NULL, NULL},
! {"RelMap", relmap_redo, relmap_desc, NULL, NULL, NULL},
! {"Standby", standby_redo, standby_desc, NULL, NULL, NULL},
! {"Heap2", heap2_redo, heap2_desc, NULL, NULL, NULL},
! {"Heap", heap_redo, heap_desc, NULL, NULL, NULL},
! {"Btree", btree_redo, btree_desc, btree_xlog_startup, btree_xlog_cleanup, btree_safe_restartpoint},
! {"Hash", hash_redo, hash_desc, NULL, NULL, NULL},
! {"Gin", gin_redo, gin_desc, gin_xlog_startup, gin_xlog_cleanup, gin_safe_restartpoint},
! {"Gist", gist_redo, gist_desc, gist_xlog_startup, gist_xlog_cleanup, NULL},
! {"Sequence", seq_redo, seq_desc, NULL, NULL, NULL},
! {"SPGist", spg_redo, spg_desc, spg_xlog_startup, spg_xlog_cleanup, NULL}
};
--- 24,33 ----
#include "storage/standby.h"
#include "utils/relmapper.h"
+ /* must be kept in sync with RmgrData definition in xlog_internal.h */
+ #define PG_RMGR(symname,name,redo,desc,startup,cleanup,restartpoint) \
+ { name, redo, desc, startup, cleanup, restartpoint },
const RmgrData RmgrTable[RM_MAX_ID + 1] = {
! #include "access/rmgrlist.h"
};
*** a/src/include/access/rmgr.h
--- b/src/include/access/rmgr.h
***************
*** 13,39 **** typedef uint8 RmgrId;
/*
* Built-in resource managers
*
* Note: RM_MAX_ID could be as much as 255 without breaking the XLOG file
* format, but we keep it small to minimize the size of RmgrTable[].
*/
! #define RM_XLOG_ID 0
! #define RM_XACT_ID 1
! #define RM_SMGR_ID 2
! #define RM_CLOG_ID 3
! #define RM_DBASE_ID 4
! #define RM_TBLSPC_ID 5
! #define RM_MULTIXACT_ID 6
! #define RM_RELMAP_ID 7
! #define RM_STANDBY_ID 8
! #define RM_HEAP2_ID 9
! #define RM_HEAP_ID 10
! #define RM_BTREE_ID 11
! #define RM_HASH_ID 12
! #define RM_GIN_ID 13
! #define RM_GIST_ID 14
! #define RM_SEQ_ID 15
! #define RM_SPGIST_ID 16
! #define RM_MAX_ID RM_SPGIST_ID
#endif /* RMGR_H */
--- 13,35 ----
/*
* Built-in resource managers
*
+ * The actual numerical values for each rmgr ID are defined by the order
+ * of entries in rmgrlist.h.
+ *
* Note: RM_MAX_ID could be as much as 255 without breaking the XLOG file
* format, but we keep it small to minimize the size of RmgrTable[].
*/
! #define PG_RMGR(symname,name,redo,desc,startup,cleanup,restartpoint) \
! symname,
!
! typedef enum RmgrIds
! {
! #include "access/rmgrlist.h"
! RM_NEXT_ID
! } RmgrIds;
!
! #undef PG_RMGR
! #define RM_MAX_ID (RM_NEXT_ID - 1)
#endif /* RMGR_H */
*** /dev/null
--- b/src/include/access/rmgrlist.h
***************
*** 0 ****
--- 1,42 ----
+ /*---------------------------------------------------------------------------
+ * rmgrlist.h
+ *
+ * The resource manager list is kept in its own source file for possible
+ * use by automatic tools. The exact representation of a rmgr is determined
+ * by the PG_RMGR macro, which is not defined in this file; it can be
+ * defined by the caller for special purposes.
+ *
+ * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/access/rmgrlist.h
+ *---------------------------------------------------------------------------
+ */
+
+ /* there is deliberately not an #ifndef RMGRLIST_H here */
+
+ /*
+ * List of resource manager entries. Note that order of entries defines the
+ * numerical values of each rmgr's ID.
+ *
+ * Changes to this list possibly need a XLOG_PAGE_MAGIC bump.
+ */
+
+ /* symname, name, redo, desc, startup, cleanup, restartpoint */
+ PG_RMGR(RM_XLOG_ID, "XLOG", xlog_redo, xlog_desc, NULL, NULL, NULL)
+ PG_RMGR(RM_XACT_ID, "Transaction", xact_redo, xact_desc, NULL, NULL, NULL)
+ PG_RMGR(RM_SMGR_ID, "Storage", smgr_redo, smgr_desc, NULL, NULL, NULL)
+ PG_RMGR(RM_CLOG_ID, "CLOG", clog_redo, clog_desc, NULL, NULL, NULL)
+ PG_RMGR(RM_DBASE_ID, "Database", dbase_redo, dbase_desc, NULL, NULL, NULL)
+ PG_RMGR(RM_TBLSPC_ID, "Tablespace", tblspc_redo, tblspc_desc, NULL, NULL, NULL)
+ PG_RMGR(RM_MULTIXACT_ID, "MultiXact", multixact_redo, multixact_desc, NULL, NULL, NULL)
+ PG_RMGR(RM_RELMAP_ID, "RelMap", relmap_redo, relmap_desc, NULL, NULL, NULL)
+ PG_RMGR(RM_STANDBY_ID, "Standby", standby_redo, standby_desc, NULL, NULL, NULL)
+ PG_RMGR(RM_HEAP2_ID, "Heap2", heap2_redo, heap2_desc, NULL, NULL, NULL)
+ PG_RMGR(RM_HEAP_ID, "Heap", heap_redo, heap_desc, NULL, NULL, NULL)
+ PG_RMGR(RM_BTREE_ID, "Btree", btree_redo, btree_desc, btree_xlog_startup, btree_xlog_cleanup, btree_safe_restartpoint)
+ PG_RMGR(RM_HASH_ID, "Hash", hash_redo, hash_desc, NULL, NULL, NULL)
+ PG_RMGR(RM_GIN_ID, "Gin", gin_redo, gin_desc, gin_xlog_startup, gin_xlog_cleanup, gin_safe_restartpoint)
+ PG_RMGR(RM_GIST_ID, "Gist", gist_redo, gist_desc, gist_xlog_startup, gist_xlog_cleanup, NULL)
+ PG_RMGR(RM_SEQ_ID, "Sequence", seq_redo, seq_desc, NULL, NULL, NULL)
+ PG_RMGR(RM_SPGIST_ID, "SPGist", spg_redo, spg_desc, spg_xlog_startup, spg_xlog_cleanup, NULL)
*** a/src/include/access/xlog_internal.h
--- b/src/include/access/xlog_internal.h
***************
*** 233,239 **** struct XLogRecord;
/*
* Method table for resource managers.
*
! * RmgrTable[] is indexed by RmgrId values (see rmgr.h).
*/
typedef struct RmgrData
{
--- 233,242 ----
/*
* Method table for resource managers.
*
! * This struct must be kept in sync with the PG_RMGR definition in
! * rmgr.c.
! *
! * RmgrTable[] is indexed by RmgrId values (see rmgrlist.h).
*/
typedef struct RmgrData
{
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