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[Frama-c-discuss] how to modify stmt in AST by using a visitor

  • Subject: [Frama-c-discuss] how to modify stmt in AST by using a visitor
  • From: Guillaume.PETIOT at cea.fr (PETIOT Guillaume)
  • Date: Tue, 10 Dec 2013 07:44:53 +0000
  • In-reply-to: <CAA1cxujRpWor=nBKyTdgsCvejLeMgFi+sLqUKbYKvVJQeiWYiA@mail.gmail.com>
  • References: <CAA1cxujRpWor=nBKyTdgsCvejLeMgFi+sLqUKbYKvVJQeiWYiA@mail.gmail.com>
Hi,

You applied your transformation on the AST of project prj (called "transfer") when you did
                 Project.on prj transform()

but you call the Printer on the current project ("default"). So you have to replace the call to the Printer by something like
                Project.on prj (fun () ->
                   Format.printf "\n\nAfter transfering:\n%a" Printer.pp_file (Ast.get ())
                ) ()
So that the Ast.Get() will return the AST of project "transfer".


You can also print the AST by invoking frama-c like this: frama-c -load-script transfer.ml pfunc.c -then-on transfer -print


Regards.
--
Guillaume Petiot, PhD student
CEA LIST

________________________________________
From: frama-c-discuss-bounces at lists.gforge.inria.fr [frama-c-discuss-bounces at lists.gforge.inria.fr] on behalf of David Yang [abiao.yang at gmail.com]
Sent: Tuesday, December 10, 2013 3:47 AM
To: Frama-C public discussion
Subject: [Frama-c-discuss] how to modify stmt in AST by using a visitor

Dear all,

Inspired by Virgile 's insert_stmt script in this mailing list:
http://lists.gforge.inria.fr/pipermail/frama-c-discuss/2012-March/003141.html

I am writing a similar script to transform all call stmt of using
function pointer to a regular call stmt.

For example, in file "pfunc.c":
/* --------------pfunc.c--------------------- */
typedef int p_func (int *, int);

int main (p_func* func, int *arg1, int arg2)
{
  int result;

  result = (*func)(arg1, arg2);

  return result;
}
/*-------------end----------------*/

the func variable is a function pointer type. I want transform this
call to a regular call statement.

The command I used here is :
frama-c -load-script transfer.ml pfunc.c

You could download this two files and then run these script directly
as long as you has frama-c in your computer.

Attached please find these two files for this command.

But the ast file is not changed by this script.

Is there anybody could help me fixing this problem?
Thank you very much.

PS: The frama-c version I used here is: Fluorine-20130601

All the best,
-david