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/* vmop.c - abstracts an operation (instructed) supported by the
* rsyslog virtual machine
*
* Module begun 2008-02-20 by Rainer Gerhards
*
* Copyright 2007, 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.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include "rsyslog.h"
#include "obj.h"
#include "vmop.h"
/* static data */
DEFobjStaticHelpers
DEFobjCurrIf(var)
/* forward definitions */
static rsRetVal vmopOpcode2Str(vmop_t *pThis, uchar **ppName);
/* Standard-Constructor
*/
BEGINobjConstruct(vmop) /* be sure to specify the object type also in END macro! */
ENDobjConstruct(vmop)
/* ConstructionFinalizer
* rgerhards, 2008-01-09
*/
rsRetVal vmopConstructFinalize(vmop_t __attribute__((unused)) *pThis)
{
DEFiRet;
ISOBJ_TYPE_assert(pThis, vmop);
RETiRet;
}
/* destructor for the vmop object */
BEGINobjDestruct(vmop) /* be sure to specify the object type also in END and CODESTART macros! */
CODESTARTobjDestruct(vmop)
if(pThis->operand.pVar != NULL)
var.Destruct(&pThis->operand.pVar);
ENDobjDestruct(vmop)
/* DebugPrint support for the vmop object */
BEGINobjDebugPrint(vmop) /* be sure to specify the object type also in END and CODESTART macros! */
uchar *pOpcodeName;
cstr_t *pStrVar;
CODESTARTobjDebugPrint(vmop)
vmopOpcode2Str(pThis, &pOpcodeName);
CHKiRet(rsCStrConstruct(&pStrVar));
CHKiRet(rsCStrFinish(&pStrVar));
if(pThis->operand.pVar != NULL) {
CHKiRet(var.Obj2Str(pThis->operand.pVar, pStrVar));
}
dbgoprint((obj_t*) pThis, "%.12s\t%s\n", pOpcodeName, rsCStrGetSzStrNoNULL(pStrVar));
rsCStrDestruct(&pStrVar);
finalize_it:
ENDobjDebugPrint(vmop)
/* This function is similar to DebugPrint, but does not send its output to
* the debug log but instead to a caller-provided string. The idea here is that
* we can use this string to get a textual representation of an operation.
* Among others, this is useful for creating testbenches, our first use case for
* it. Here, it enables simple comparison of the resulting program to a
* reference program by simple string compare.
* Note that the caller must initialize the string object. We always add
* data to it. So, it can be easily combined into a chain of methods
* to generate the final string.
* rgerhards, 2008-07-04
*/
static rsRetVal
Obj2Str(vmop_t *pThis, cstr_t *pstrPrg)
{
uchar *pOpcodeName;
uchar szBuf[2048];
size_t lenBuf;
DEFiRet;
ISOBJ_TYPE_assert(pThis, vmop);
assert(pstrPrg != NULL);
vmopOpcode2Str(pThis, &pOpcodeName);
lenBuf = snprintf((char*) szBuf, sizeof(szBuf), "%s\t", pOpcodeName);
CHKiRet(rsCStrAppendStrWithLen(pstrPrg, szBuf, lenBuf));
if(pThis->operand.pVar != NULL)
CHKiRet(var.Obj2Str(pThis->operand.pVar, pstrPrg));
CHKiRet(rsCStrAppendChar(pstrPrg, '\n'));
finalize_it:
RETiRet;
}
/* set operand (variant case)
* rgerhards, 2008-02-20
*/
static rsRetVal
vmopSetVar(vmop_t *pThis, var_t *pVar)
{
DEFiRet;
ISOBJ_TYPE_assert(pThis, vmop);
ISOBJ_TYPE_assert(pVar, var);
pThis->operand.pVar = pVar;
RETiRet;
}
/* set operation
* rgerhards, 2008-02-20
*/
static rsRetVal
vmopSetOpcode(vmop_t *pThis, opcode_t opcode)
{
DEFiRet;
ISOBJ_TYPE_assert(pThis, vmop);
pThis->opcode = opcode;
RETiRet;
}
/* a way to turn an opcode into a readable string
*/
static rsRetVal
vmopOpcode2Str(vmop_t *pThis, uchar **ppName)
{
DEFiRet;
ISOBJ_TYPE_assert(pThis, vmop);
switch(pThis->opcode) {
case opcode_OR:
*ppName = (uchar*) "or";
break;
case opcode_AND:
*ppName = (uchar*) "and";
break;
case opcode_PLUS:
*ppName = (uchar*) "add";
break;
case opcode_MINUS:
*ppName = (uchar*) "sub";
break;
case opcode_TIMES:
*ppName = (uchar*) "mul";
break;
case opcode_DIV:
*ppName = (uchar*) "div";
break;
case opcode_MOD:
*ppName = (uchar*) "mod";
break;
case opcode_NOT:
*ppName = (uchar*) "not";
break;
case opcode_CMP_EQ:
*ppName = (uchar*) "cmp_==";
break;
case opcode_CMP_NEQ:
*ppName = (uchar*) "cmp_!=";
break;
case opcode_CMP_LT:
*ppName = (uchar*) "cmp_<";
break;
case opcode_CMP_GT:
*ppName = (uchar*) "cmp_>";
break;
case opcode_CMP_LTEQ:
*ppName = (uchar*) "cmp_<=";
break;
case opcode_CMP_CONTAINS:
*ppName = (uchar*) "contains";
break;
case opcode_CMP_STARTSWITH:
*ppName = (uchar*) "startswith";
break;
case opcode_CMP_GTEQ:
*ppName = (uchar*) "cmp_>=";
break;
case opcode_PUSHSYSVAR:
*ppName = (uchar*) "push_sysvar";
break;
case opcode_PUSHMSGVAR:
*ppName = (uchar*) "push_msgvar";
break;
case opcode_PUSHCONSTANT:
*ppName = (uchar*) "push_const";
break;
case opcode_POP:
*ppName = (uchar*) "pop";
break;
case opcode_UNARY_MINUS:
*ppName = (uchar*) "unary_minus";
break;
case opcode_STRADD:
*ppName = (uchar*) "strconcat";
break;
case opcode_FUNC_CALL:
*ppName = (uchar*) "func_call";
break;
default:
*ppName = (uchar*) "!invalid_opcode!";
break;
}
RETiRet;
}
/* queryInterface function
* rgerhards, 2008-02-21
*/
BEGINobjQueryInterface(vmop)
CODESTARTobjQueryInterface(vmop)
if(pIf->ifVersion != vmopCURR_IF_VERSION) { /* check for current version, increment on each change */
ABORT_FINALIZE(RS_RET_INTERFACE_NOT_SUPPORTED);
}
/* ok, we have the right interface, so let's fill it
* Please note that we may also do some backwards-compatibility
* work here (if we can support an older interface version - that,
* of course, also affects the "if" above).
*/
pIf->Construct = vmopConstruct;
pIf->ConstructFinalize = vmopConstructFinalize;
pIf->Destruct = vmopDestruct;
pIf->DebugPrint = vmopDebugPrint;
pIf->SetOpcode = vmopSetOpcode;
pIf->SetVar = vmopSetVar;
pIf->Opcode2Str = vmopOpcode2Str;
pIf->Obj2Str = Obj2Str;
finalize_it:
ENDobjQueryInterface(vmop)
/* Initialize the vmop class. Must be called as the very first method
* before anything else is called inside this class.
* rgerhards, 2008-02-19
*/
BEGINObjClassInit(vmop, 1, OBJ_IS_CORE_MODULE) /* class, version */
/* request objects we use */
CHKiRet(objUse(var, CORE_COMPONENT));
OBJSetMethodHandler(objMethod_DEBUGPRINT, vmopDebugPrint);
OBJSetMethodHandler(objMethod_CONSTRUCTION_FINALIZER, vmopConstructFinalize);
ENDObjClassInit(vmop)
/* vi:set ai:
*/
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