-----Original Message-----
From: Axel Naumann [mailto:Axel.Naumann_at_cern.ch]
Sent: 05 December 2007 18:03
To: Borse, Ganesh
Cc: Rene Brun; roottalk_at_root.cern.ch; 'cint_at_root.cern.ch'
Subject: Re: [CINT] Re: [ROOT] Embedding CINT in C++ application
Hi,
the bytecode never goes to file - it is generated and stays in memory. The C++ code does, but the OS should cache it, so disk latency should not matter.
Cheers, Axel.
Borse, Ganesh wrote:
> What about disk latency when accessing the byte code from the file?
>
> -----Original Message-----
> From: owner-roottalk_at_root.cern.ch [mailto:owner-roottalk_at_root.cern.ch]
> On Behalf Of Axel Naumann
> Sent: 05 December 2007 17:46
> To: Borse, Ganesh
> Cc: Rene Brun; roottalk_at_root.cern.ch; 'cint_at_root.cern.ch'
> Subject: Re: [CINT] Re: [ROOT] Embedding CINT in C++ application
>
> Hi,
>
> you could write it to a temporary file. If you call it e.g.
> "tempAHGHJGJ.C" and wrap your code in a function "tempAHGHJGJ()" you can simply do gInterpreter->ProcessLine(".x tempAHGHJGJ.C"). This file will be run with bytecode optimization.
>
> Cheers, Axel.
>
> Borse, Ganesh wrote:
>> ProcessLine would be slower because every call to ProcessLine will parse the expression & then execute it.
>>
>> Is it possible to do the onetime parsing (& compile) of such expression & then execute that byte code later multiple times?
>>
>> E.g. I wrap this expression in a function like below:
>>
>> const char *myFuncSrc=\
>> "int MyFunction(int size, int vol, int ADV,char* prod, char*
>> ordClient)\ {\
>> if((size < 1000) && (vol < (0.001 * ADV)) && (prod == "Stock") && strstr("ABCD,EFGH,HIJK,NEWONE,song,JUNK,DONE",ordClient))\
>> return 1;\
>> else\
>> return 0;\
>> }"
>> // Parse & Compile this function
>> gInterpreter->ProcessLine(myFuncSrc);
>> while(1){
>> // --- data for variables come in from client application over a socket connection
>> char* argv[]=; // populate the input arguments....
>> Int result=0;
>> gInterpreter->Execute("MyFunction",argv,&result);
>> printf("result %d\n",result);
>> }
>>
>> How do we do this kind of actions with Tinterpreter or other APIs of cint?
>> Sorry for long list of questions.
>>
>> Thanks & Regards,
>> Ganesh
>> -----Original Message-----
>> From: Axel Naumann [mailto:Axel.Naumann_at_cern.ch]
>> Sent: 05 December 2007 17:09
>> To: Rene Brun
>> Cc: Borse, Ganesh; roottalk_at_root.cern.ch; 'cint_at_root.cern.ch'
>> Subject: Re: [CINT] Re: [ROOT] Embedding CINT in C++ application
>>
>> ...or, for more of C++ including variable declaration etc, pass your C++ code as a string to ROOT's gInterpreter>ProcessLine(). gInterpreter is ROOT's global TCint object; a high level interface to CINT. See <http://root.cern.ch/root/html/TCint#TCint:ProcessLine> If you weant to do the same with CINT stand-alone then please let us know.
>>
>> Cheers, Axel.
>>
>> Rene Brun wrote:
>>> ROOT provides two classes (TFormula and TTreeFormula) for doing
>>> exactly what you want to do.
>>> see examples of use with ROOT Trees in the Users Guide
>>> ftp://root.cern.ch/root/doc/12Trees.pdf
>>> at section "Simple Analysis using Trees" at page 213 and following
>>>
>>> Rene Brun
>>>
>>> Borse, Ganesh wrote:
>>>> Hi,
>>>> Is it possible to embed ROOT CINT in C++ application & use it for
>>>> doing dynamic expressions parsing, compilation and then multiple
>>>> run time evaluations those expressions?
>>>>
>>>> I can see the root/bin/cint has all its logic in
>>>> root/lib/libCint.so, with ldd command.
>>>>
>>>> E.g, I have the expressions as below:
>>>> ((size < 1000) && (vol < (0.001 * ADV)) && (prod == "Stock") &&
>>>> strstr("ABCD,EFGH,HIJK,NEWONE,song,JUNK,DONE",ordClient))
>>>>
>>>> The variables size, ADV, vol, etc. will be changing at runtime.
>>>> So, I would like to create function which will take these variables
>>>> as input arguments & return the result of evaluated expression.
>>>>
>>>> Since, these expressions, the number & type of these variables is
>>>> not at compilation time, I cannot create & compile these function
>>>> at compiling my application.
>>>>
>>>> Hence, I need to use some kind of interpreter which can take these
>>>> expressions, etc as source code & compile them.
>>>>
>>>> I tried to use Python & Perl interpreters for embedding them in C++
>>>> application. But they don't provide the required performance level.
>>>>
>>>> Also, the syntax of the expressions is to be same that in these
>>>> scripting languages. Hence, it is little tedious to use them.
>>>>
>>>> May you please guide me, if I can use cint for this?
>>>> What are the functions, APIs & include headers, etc. I need to use
>>>> for this?
>>>>
>>>> A sample program of the same thing which I am doing with Cpython
>>>> API (embedding Python in C) is attached here.
>>>>
>>>> Thanks and Regards,
>>>> Ganesh
>>>> <<testeval.cpp>>
>>>>
>>>> ===================================================================
>>>> =
>>>> =
>>>> =========
>>>>
>>>> Please access the attached hyperlink for an important electronic
>>>> communications disclaimer:
>>>> http://www.credit-suisse.com/legal/en/disclaimer_email_ib.html
>>>> ===================================================================
>>>> =
>>>> =
>>>> =========
>>>>
>>>>
>> =====================================================================
>> = ======== Please access the attached hyperlink for an important
>> electronic communications disclaimer:
>>
>> http://www.credit-suisse.com/legal/en/disclaimer_email_ib.html
>> =====================================================================
>> =
>> ========
>>
>>
http://www.credit-suisse.com/legal/en/disclaimer_email_ib.html
This archive was generated by hypermail 2.2.0 : Thu Dec 06 2007 - 11:50:02 CET