Internal Representation

Internal Representation

[Nicolas COLLIN]

Hello,
I looked at the part of the documentation about function bodies and I 
wonder something : is there a way to get the function calls from it ? 
Because I'd like to make a call graph which represent function and the 
functions it calls.
Thank you.

Nicolas COLLIN

Re: Internal Representation

[Ian Lance Taylor]

Nicolas COLLIN <nicolas.collin@fr.thalesgroup.com> writes:

> I looked at the part of the documentation about function bodies and I
> wonder something : is there a way to get the function calls from it ?
> Because I'd like to make a call graph which represent function and the
> functions it calls.

gcc builds a call graph.  See cgraph.h.

Ian

Re: Internal Representation

[Daniel Berlin]

You must be looking at old documentation or something.
Call's are represented by GIMPLE_CALL_STMT (or CALL_EXPR in older GCC'en).
There has been a callgraph for quite a long time (see cgraph*.c and cgraph*.h)

On Tue, Jul 7, 2009 at 7:26 AM, Nicolas
COLLIN<nicolas.collin@fr.thalesgroup.com> wrote:
> Hello,
> I looked at the part of the documentation about function bodies and I wonder
> something : is there a way to get the function calls from it ? Because I'd
> like to make a call graph which represent function and the functions it
> calls.
> Thank you.
>
> Nicolas COLLIN
>

Internal Representation

[Nicolas COLLIN]

Hello,
my purpose is to write informations about a function by reading its body 
from internal representation. I got the body with DECL_SAVED_TREE and I 
succeed to get the name of functions and methods called from CALL_EXPR, 
using TREE_OPERAND, EXPR_STMT_EXPR, etc... But I can't get the object on 
which is called the method (for example in att.getX(); i would like to 
get the name :"att"). I tried in many ways but never got it.
Can you help me ?
Thank you.

Nicolas COLLIN

Re: Internal Representation

[Ian Lance Taylor]

Nicolas COLLIN <nicolas.collin@fr.thalesgroup.com> writes:

>> From internal representation. I got the body with DECL_SAVED_TREE
>> and I 
> succeed to get the name of functions and methods called from
> CALL_EXPR, using TREE_OPERAND, EXPR_STMT_EXPR, etc... But I can't get
> the object on which is called the method (for example in att.getX(); i
> would like to get the name :"att"). I tried in many ways but never got
> it.

There need not be any such name (f().getX()), or for a given call there
may be more than one such name (f ? a.getX() : b.getX() with the method
call factored out by the optimizers).  Assuming you are working in SSA
form, and assuming you have an SSA_VAR, the best you can do is look back
to the defining statement to see if you can find a VAR_DECL there.

Ian