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/* The vmop object.
*
* Copyright 2008-2012 Rainer Gerhards and Adiscon GmbH.
*
* This file is part of rsyslog.
*
* This file is part of the rsyslog runtime library.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
* -or-
* see COPYING.ASL20 in the source distribution
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef INCLUDED_VMOP_H
#define INCLUDED_VMOP_H
#include "ctok_token.h"
#include "vmstk.h"
#include "stringbuf.h"
/* machine instructions types */
typedef enum { /* do NOT start at 0 to detect uninitialized types after calloc() */
opcode_INVALID = 0,
/* for simplicity of debugging and reading dumps, we use the same IDs
* that the tokenizer uses where this applicable.
*/
opcode_OR = ctok_OR,
opcode_AND = ctok_AND,
opcode_STRADD= ctok_STRADD,
opcode_PLUS = ctok_PLUS,
opcode_MINUS = ctok_MINUS,
opcode_TIMES = ctok_TIMES, /* "*" */
opcode_DIV = ctok_DIV,
opcode_MOD = ctok_MOD,
opcode_NOT = ctok_NOT,
opcode_CMP_EQ = ctok_CMP_EQ, /* all compare operations must be in a row */
opcode_CMP_NEQ = ctok_CMP_NEQ,
opcode_CMP_LT = ctok_CMP_LT,
opcode_CMP_GT = ctok_CMP_GT,
opcode_CMP_LTEQ = ctok_CMP_LTEQ,
opcode_CMP_CONTAINS = ctok_CMP_CONTAINS,
opcode_CMP_STARTSWITH = ctok_CMP_STARTSWITH,
opcode_CMP_CONTAINSI = ctok_CMP_CONTAINSI,
opcode_CMP_STARTSWITHI = ctok_CMP_STARTSWITHI,
opcode_CMP_GTEQ = ctok_CMP_GTEQ, /* end compare operations */
/* here we start our own codes */
opcode_POP = 1000, /* requires var operand to receive result */
opcode_PUSHSYSVAR = 1001, /* requires var operand */
opcode_PUSHMSGVAR = 1002, /* requires var operand */
opcode_PUSHCONSTANT = 1003, /* requires var operand */
opcode_UNARY_MINUS = 1010,
opcode_FUNC_CALL = 1012,
opcode_END_PROG = 2000
} opcode_t;
/* Additional doc, operation specific
FUNC_CALL
All parameter passing is via the stack. Parameters are placed onto the stack in reverse order,
that means the last parameter is on top of the stack, the first at the bottom location.
At the actual top of the stack is the number of parameters. This permits functions to be
called with variable number of arguments. The function itself is responsible for poping
the right number of parameters of the stack and complaining if the number is incorrect.
On exit, a single return value must be pushed onto the stack. The FUNC_CALL operation
is generic. Its pVar argument contains the function name string (TODO: very slow, make
faster in later releases).
Sample Function call: sampleFunc(p1, p2, p3) ; returns number 4711 (sample)
Stacklayout on entry (order is top to bottom):
3
p3
p2
p1
... other vars ...
Stack on exit
4711
... other vars ...
*/
/* the vmop object */
typedef struct vmop_s {
BEGINobjInstance; /* Data to implement generic object - MUST be the first data element! */
opcode_t opcode;
union {
var_t *pVar;
prsf_t rsf; /* pointer to function for "call" instruction */
} operand;
struct vmop_s *pNext; /* next operation or NULL, if end of program (logically this belongs to vmprg) */
} vmop_t;
/* interfaces */
BEGINinterface(vmop) /* name must also be changed in ENDinterface macro! */
INTERFACEObjDebugPrint(vmop);
rsRetVal (*Construct)(vmop_t **ppThis);
rsRetVal (*ConstructFinalize)(vmop_t __attribute__((unused)) *pThis);
rsRetVal (*Destruct)(vmop_t **ppThis);
rsRetVal (*SetOpcode)(vmop_t *pThis, opcode_t opcode);
rsRetVal (*SetVar)(vmop_t *pThis, var_t *pVar);
rsRetVal (*Opcode2Str)(vmop_t *pThis, uchar **ppName);
rsRetVal (*Obj2Str)(vmop_t *pThis, cstr_t *pstr);
/* v2 */
rsRetVal (*SetFunc)(vmop_t *pThis, cstr_t *pcsFuncName);
ENDinterface(vmop)
#define vmopCURR_IF_VERSION 2 /* increment whenever you change the interface structure! */
/* interface changes, v1 -> v2
* added SetFuct after existing function pointers -- rgerhards, 2009-04-06
*/
/* the remaining prototypes */
PROTOTYPEObj(vmop);
#endif /* #ifndef INCLUDED_VMOP_H */
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