On-the-fly compilation and execution of C++ program

[Raxit]

Hi,
we are designing some stuff , that will generate c++ program(s)
What we want is we wanted to execute that generated code....

i.e.
1. Xml based language
2. C++ code generated from 1.[Its mapping between 1 & 2]
3. compilation
4. execution.

What we have got stucked at compilation, we want that our user should
not take care about compilation or c++ code generation etc...They just
write some xml "code" and it should execute !

[we are developing something like Event processor, reactor system etc]
-Raxit

[Kai-Uwe Bux]

Ra***@MyKavita. com wrote:

Hi,
we are designing some stuff , that will generate c++ program(s)
What we want is we wanted to execute that generated code....

i.e.
1. Xml based language
2. C++ code generated from 1.[Its mapping between 1 & 2]
3. compilation
4. execution.

What we have got stucked at compilation, we want that our user should
not take care about compilation or c++ code generation etc...They just
write some xml "code" and it should execute !

[snip]

Well, what about using a compiler? If you don't want to write your own,
which would take a while, you could contact a compiler vendor for the
target platform and obtain a license to include a compiler into your
package and call it from a script or something. Other than that, you could
document the need for a C++ compiler and test for it during installation of
your program.
Best

Kai-Uwe Bux

[gyakoo]

On 31 mayo, 22:51, Kai-Uwe Bux <jkherci...@gmx .netwrote:

Ra...@MyKavita. com wrote:

Hi,

we are designing some stuff , that will generate c++ program(s)
What we want is we wanted to execute that generated code....

i.e.
1. Xml based language
2. C++ code generated from 1.[Its mapping between 1 & 2]
3. compilation
4. execution.

What we have got stucked at compilation, we want that our user should
not take care about compilation or c++ code generation etc...They just
write some xml "code" and it should execute !

[snip]

Well, what about using a compiler? If you don't want to write your own,
which would take a while, you could contact a compiler vendor for the
target platform and obtain a license to include a compiler into your
package and call it from a script or something. Other than that, you could
document the need for a C++ compiler and test for it during installation of
your program.

Best

Kai-Uwe Bux

Well, I suppose that you have study .net alternative. If not, .net has
libraries to compile a code into common language code (something like
java bytecode, but in an exe or dll form), and to do a c++/c# parser
and compiler is pretty easy.
In a project I used c# as script language, which was compiled and
executed in runtime.

I hope that this help you.

[James Kanze]

On May 31, 10:51 pm, Kai-Uwe Bux <jkherci...@gmx .netwrote:

Ra...@MyKavita. com wrote:

we are designing some stuff , that will generate c++
program(s) What we want is we wanted to execute that
generated code....

i.e.
1. Xml based language
2. C++ code generated from 1.[Its mapping between 1 & 2]
3. compilation
4. execution.

What we have got stucked at compilation, we want that our
user should not take care about compilation or c++ code
generation etc...They just write some xml "code" and it
should execute !

[snip]

Well, what about using a compiler? If you don't want to write
your own, which would take a while, you could contact a
compiler vendor for the target platform and obtain a license
to include a compiler into your package and call it from a
script or something. Other than that, you could document the
need for a C++ compiler and test for it during installation of
your program.

The real question is why they would insist on C++ for step 2.
It seems highly unlikely that machine generated code from user
written XML would require all of the power of C++. Unless they
really needed the speed of an optimized compilation, I'd
probably just "invent" some sort of internal language that was
1) easy to generate from XML, 2) easy to parse, and 3) easy to
interpret effectively. (Said language might not even support
text as a source format.)

--
James Kanze (GABI Software) email:ja******* **@gmail.com
Conseils en informatique orientée objet/
Beratung in objektorientier ter Datenverarbeitu ng
9 place Sémard, 78210 St.-Cyr-l'École, France, [phone]

[Raxit]

On Jun 1, 5:05 am, James Kanze <james.ka...@gm ail.comwrote:

On May 31, 10:51 pm, Kai-Uwe Bux <jkherci...@gmx .netwrote:

Ra...@MyKavita. com wrote:

we are designing some stuff , that will generate c++
program(s) What we want is we wanted to execute that
generated code....
i.e.
1. Xml based language
2. C++ code generated from 1.[Its mapping between 1 & 2]
3. compilation
4. execution.
What we have got stucked at compilation, we want that our
user should not take care about compilation or c++ code
generation etc...They just write some xml "code" and it
should execute !

[snip]
Well, what about using a compiler? If you don't want to write
your own, which would take a while, you could contact a
compiler vendor for the target platform and obtain a license
to include a compiler into your package and call it from a
script or something. Other than that, you could document the
need for a C++ compiler and test for it during installation of
your program.

The real question is why they would insist on C++ for step 2.

James, This is interesting point, we are at very early stage, and for
step 1 & 2, there is Boost library available (we know still it is not
very much straight forward job and it may require some dirty hacks, we
think it will be more easy.)

It seems highly unlikely that machine generated code from user
written XML would require all of the power of C++. Unless they

no, we may not require all the power of c++, you can say like XML is
like domain specific language that our developer want to execute, but C
++ code will be generated in middle, and finally bytecode/machinecode/
ELF32 etc...

really needed the speed of an optimized compilation, I'd
probably just "invent" some sort of internal language that was
1) easy to generate from XML, 2) easy to parse, and 3) easy to
interpret effectively. (Said language might not even support
text as a source format.)

We do think instead of generating new languages for optimized
compilation, its good idea not to re-invent wheel.(we may be wrong and
we are very early stage of poc, we may do something very much
diffenetly.)

>
--
James Kanze (GABI Software) email:james.ka. [e-mail]
Conseils en informatique orientée objet/
Beratung in objektorientier ter Datenverarbeitu ng
9 place Sémard, 78210 St.-Cyr-l'École, France, [phone]

-Raxit Sheth

[kwikius]

"Ra***@MyKavita .com" <ra************ @gmail.comwrote in message
news:20******** *************** ***********@p25 g2000pri.google groups.com...
On Jun 1, 5:05 am, James Kanze <james.ka...@gm ail.comwrote:

On May 31, 10:51 pm, Kai-Uwe Bux <jkherci...@gmx .netwrote:

Ra...@MyKavita. com wrote:

we are designing some stuff , that will generate c++
program(s) What we want is we wanted to execute that
generated code....
i.e.
1. Xml based language
2. C++ code generated from 1.[Its mapping between 1 & 2]
3. compilation
4. execution.
What we have got stucked at compilation, we want that our
user should not take care about compilation or c++ code
generation etc...They just write some xml "code" and it
should execute !

IMO I wouldnt worry about generating C++ code and use an intermediate
language :

JVM cross platform

http://en.wikipedia.org/wiki/Java_Virtual_Machine

For .Net (windows targets) use CLR :

http://en.wikipedia.org/wiki/Common_Language_Runtime

(See also LINQ which has AFAIK some nice XML facilities)
http://msdn.microsoft.com/en-gb/library/bb308960.aspx

Or LLVM cross platform

http://llvm.org/

regards
Andy Little

[James Kanze]

On Jun 1, 5:21 pm, "Ra...@MyKavita .com" <raxitsheth2... @gmail.com>
wrote:

On Jun 1, 5:05 am, James Kanze <james.ka...@gm ail.comwrote:

On May 31, 10:51 pm, Kai-Uwe Bux <jkherci...@gmx .netwrote:

Ra...@MyKavita. com wrote:
we are designing some stuff , that will generate c++
program(s) What we want is we wanted to execute that
generated code....
i.e.
1. Xml based language
2. C++ code generated from 1.[Its mapping between 1 & 2]
3. compilation
4. execution.
What we have got stucked at compilation, we want that our
user should not take care about compilation or c++ code
generation etc...They just write some xml "code" and it
should execute !
[snip]
Well, what about using a compiler? If you don't want to write
your own, which would take a while, you could contact a
compiler vendor for the target platform and obtain a license
to include a compiler into your package and call it from a
script or something. Other than that, you could document the
need for a C++ compiler and test for it during installation of
your program.

The real question is why they would insist on C++ for step 2.

James, This is interesting point, we are at very early stage,
and for step 1 & 2, there is Boost library available (we know
still it is not very much straight forward job and it may
require some dirty hacks, we think it will be more easy.)It
seems highly unlikely that machine generated code from user

written XML would require all of the power of C++. Unless
they

no, we may not require all the power of c++, you can say like
XML is like domain specific language that our developer want
to execute, but C ++ code will be generated in middle, and
finally bytecode/machinecode/ ELF32 etc...

really needed the speed of an optimized compilation, I'd
probably just "invent" some sort of internal language that was
1) easy to generate from XML, 2) easy to parse, and 3) easy to
interpret effectively. (Said language might not even support
text as a source format.)

We do think instead of generating new languages for optimized
compilation, its good idea not to re-invent wheel.(we may be
wrong and we are very early stage of poc, we may do something
very much diffenetly.)

If you need the optimization, generating C or C++, then using an
optimizing compiler, is certainly a good solution. If you don't
need that much optimization, however: my point is that it is
probably just as easy to generate a simple byte code as it is
C++, and to execute that immediately.

--
James Kanze (GABI Software) email:ja******* **@gmail.com
Conseils en informatique orientée objet/
Beratung in objektorientier ter Datenverarbeitu ng
9 place Sémard, 78210 St.-Cyr-l'École, France, [phone]

[Walter Bright]

James Kanze wrote:

If you need the optimization, generating C or C++, then using an
optimizing compiler, is certainly a good solution. If you don't
need that much optimization, however: my point is that it is
probably just as easy to generate a simple byte code as it is
C++, and to execute that immediately.

Or you could just generate javascript source code, as you can get a
javascript engine that is inexpensive (free, even) and relatively small.

http://www.digitalmars.com/dscript/index.html

Yes, I wrote it.

-----------------
Walter Bright
Digital Mars
http://www.digitalmars.com C, C++, D programming language compilers

[James Kanze]

On Jun 2, 7:47 am, Walter Bright <wal...@digital mars-nospamm.com>
wrote:

James Kanze wrote:

If you need the optimization, generating C or C++, then
using an optimizing compiler, is certainly a good solution.
If you don't need that much optimization, however: my point
is that it is probably just as easy to generate a simple
byte code as it is C++, and to execute that immediately.

Or you could just generate javascript source code, as you can
get a javascript engine that is inexpensive (free, even) and
relatively small.

http://www.digitalmars.com/dscript/index.html

That's actually a very good suggestion. Javascript, perl,
python, and probably a couple of other languages have
interpreters which you can directly link into a C++ program.
Generating one of those languages is probably no more difficult
than generating C++, and you don't have to worry about the
interpreter. (Even Perl could be used here: readability isn't a
real consideration for machine generated code.)

--
James Kanze (GABI Software) email:ja******* **@gmail.com
Conseils en informatique orientée objet/
Beratung in objektorientier ter Datenverarbeitu ng
9 place Sémard, 78210 St.-Cyr-l'École, France, [phone]

[shazled]

On May 31, 9:34*pm, "Ra...@MyKavita .com" <raxitsheth2... @gmail.com>
wrote:

we are designing some stuff , that will generate c++ program(s)
What we want is we wanted to execute that generated code....

i.e.
1. Xml based language
2. C++ code generated from 1.[Its mapping between 1 & 2]

For these first two steps something like Cog could be used:
http://nedbatchelder.com/code/cog/
(unfortunately the website is down at the moment). I have used this
with Cheetah:
http://www.cheetahtemplate.org/
to generate C++ code from XML descriptions. Cheetah could also be used
on its own to generate C++ from XML.

Saul