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/* The vm object.
*
* This implements the rsyslog virtual machine. The initial implementation is
* done to support complex user-defined expressions, but it may evolve into a
* much more useful thing over time.
*
* The virtual machine uses rsyslog variables as its memory storage system.
* All computation is done on a stack (vmstk). The vm supports a given
* instruction set and executes programs of type vmprg, which consist of
* single operations defined in vmop (which hold the instruction and the
* data).
*
* Copyright 2008 Rainer Gerhards and Adiscon GmbH.
*
* This file is part of rsyslog.
*
* Rsyslog is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Rsyslog is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Rsyslog. If not, see <http://www.gnu.org/licenses/>.
*
* A copy of the GPL can be found in the file "COPYING" in this distribution.
*/
#ifndef INCLUDED_VM_H
#define INCLUDED_VM_H
#include "msg.h"
#include "vmstk.h"
#include "vmprg.h"
/* the vm object */
typedef struct vm_s {
BEGINobjInstance; /* Data to implement generic object - MUST be the first data element! */
vmstk_t *pStk; /* The stack */
msg_t *pMsg; /* the current message (or NULL, if we have none) */
} vm_t;
/* interfaces */
BEGINinterface(vm) /* name must also be changed in ENDinterface macro! */
INTERFACEObjDebugPrint(vm);
rsRetVal (*Construct)(vm_t **ppThis);
rsRetVal (*ConstructFinalize)(vm_t __attribute__((unused)) *pThis);
rsRetVal (*Destruct)(vm_t **ppThis);
rsRetVal (*ExecProg)(vm_t *pThis, vmprg_t *pProg);
rsRetVal (*PopBoolFromStack)(vm_t *pThis, var_t **ppVar); /* there are a few cases where we need this... */
rsRetVal (*PopVarFromStack)(vm_t *pThis, var_t **ppVar); /* there are a few cases where we need this... */
rsRetVal (*SetMsg)(vm_t *pThis, msg_t *pMsg); /* there are a few cases where we need this... */
ENDinterface(vm)
#define vmCURR_IF_VERSION 1 /* increment whenever you change the interface structure! */
/* prototypes */
PROTOTYPEObj(vm);
#endif /* #ifndef INCLUDED_VM_H */
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