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Diffstat (limited to 'runtime/vm.h')
-rw-r--r-- | runtime/vm.h | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/runtime/vm.h b/runtime/vm.h new file mode 100644 index 00000000..d2458220 --- /dev/null +++ b/runtime/vm.h @@ -0,0 +1,65 @@ +/* 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 the rsyslog runtime library. + * + * The rsyslog runtime library is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * The rsyslog runtime library 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 Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with the rsyslog runtime library. If not, see <http://www.gnu.org/licenses/>. + * + * A copy of the GPL can be found in the file "COPYING" in this distribution. + * A copy of the LGPL can be found in the file "COPYING.LESSER" 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 */ |