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/*-------------------------------------------------------------------------
*
* memnodes.h
* POSTGRES memory context node definitions.
*
*
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: memnodes.h,v 1.16 2000/01/26 05:58:16 momjian Exp $
*
* XXX the typedefs in this file are different from the other ???nodes.h;
* they are pointers to structures instead of the structures themselves.
* If you're wondering, this is plain laziness. I don't want to touch
* the memory context code which should be revamped altogether some day.
* - ay 10/94
*-------------------------------------------------------------------------
*/
#ifndef MEMNODES_H
#define MEMNODES_H
#include "lib/fstack.h"
#include "nodes/nodes.h"
#include "utils/memutils.h"
/*
* MemoryContext
* A logical context in which memory allocations occur.
*
* The types of memory contexts can be thought of as members of the
* following inheritance hierarchy with properties summarized below.
*
* Node
* |
* MemoryContext___
* / \
* GlobalMemory PortalMemoryContext
* / \
* PortalVariableMemory PortalHeapMemory
*
* Flushed at Flushed at Checkpoints
* Transaction Portal
* Commit Close
*
* GlobalMemory n n n
* PortalVariableMemory n y n
* PortalHeapMemory y y y
*/
typedef struct MemoryContextMethodsData
{
Pointer (*alloc) ();
void (*free_p) (); /* need to use free as a #define, so can't
* use free */
Pointer (*realloc) ();
char *(*getName) ();
void (*dump) ();
} *MemoryContextMethods;
typedef struct MemoryContextData
{
NodeTag type;
MemoryContextMethods method;
} MemoryContextData;
/* utils/mcxt.h contains typedef struct MemoryContextData *MemoryContext */
/* think about doing this right some time but we'll have explicit fields
for now -ay 10/94 */
typedef struct GlobalMemoryData
{
NodeTag type;
MemoryContextMethods method;
AllocSetData setData;
char *name;
OrderedElemData elemData;
} GlobalMemoryData;
/* utils/mcxt.h contains typedef struct GlobalMemoryData *GlobalMemory */
typedef struct MemoryContextData *PortalMemoryContext;
typedef struct PortalVariableMemoryData
{
NodeTag type;
MemoryContextMethods method;
AllocSetData setData;
} *PortalVariableMemory;
typedef struct PortalHeapMemoryData
{
NodeTag type;
MemoryContextMethods method;
Pointer block;
FixedStackData stackData;
} *PortalHeapMemory;
/*
* MemoryContextIsValid
* True iff memory context is valid.
*/
#define MemoryContextIsValid(context) \
(IsA(context,MemoryContext) || IsA(context,GlobalMemory) || \
IsA(context,PortalVariableMemory) || IsA(context,PortalHeapMemory))
#endif /* MEMNODES_H */
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