Re: How to insert external global variable declarations and pointer assignment statements through GCC plugin GIMPLE pass

["Abhijit Nandy" <abhijit dot nandy at gmail dot com>]

Yes you are right I am looking at a dump file.

My C input file is testcode.c and after I compile with the plugin enabled as 
:

gcc -fplugin=./test_plugin.so -Wall -fdump-tree-gimple -fdump-tree-all 
testcode.c molen_htx.c -o testcode

The molen_htx.c has the molen_elfset()

I get the following linker error :

root@slax:/mnt/f/Thesis/gcc-pluginelf# make testcode
cc -I/usr/lib/gcc/i486-slackware-linux/4.5.2/plugin/include -fPIC -Wall   -c 
-o test_plugin.o test_plugin.c
gcc -shared test_plugin.o -o test_plugin.so
gcc -fplugin=./test_plugin.so -Wall -fdump-tree-gimple -fdump-tree-all 
testcode.c molen_htx.c -o testcode
plugin init test_plugin
testcode.c: In function 'main':
testcode.c:26:7: warning: unused variable 'q'
plugin init test_plugin
/tmp/ccLUccsU.o: In function `main':
testcode.c:(.text+0x82): undefined reference to `_binary_ccu_start' 
<---------------
collect2: ld returned 1 exit status
make: *** [testcode] Error 1


A dump file called testcode.c.220t.replace is produced which does not show 
the global declaration(if it is being inserted at all)

But the undefined reference implies that the global extern declaration was 
not inserted.

Thanks,
Abhi

-----Original Message----- 
From: Ian Lance Taylor
Sent: Tuesday, June 14, 2011 7:18 PM
To: Abhijit Nandy
Cc: gcc
Subject: Re: How to insert external global variable declarations and pointer 
assignment statements through GCC plugin GIMPLE pass

"Abhijit Nandy" <abhijit.nandy@gmail.com> writes:

> I get the following output from it :
>
> ;; Function main (main)
>
> main ()
> {
>  char * p.1;
>
> <bb 2>:
> .....
>  p.1 = &_binary_ccu_start;
>  molen_elfset (p.1);
> ....
> }
> ------------------------------------------------------------------------------------
>
> To recall I am trying to insert the following in a C program :
>
> extern char _binary_ccu_start;
>
> int main (int argc, char **argv)
> {
> ....
>    char *p = &_binary_ccu_start;
>    molen_elfset(p);
> ...
> }

If you are looking at a dump file, then it seems to me that you are
getting what you want.  A dump file is not a C file; it doesn't list the
extern declarations explicitly.

Let me know if I'm missing something.

Ian