* Re: Problem with instrumenting GIMPLE for adding a global variable
@ 2005-08-20 23:53 Prateek Saxena
0 siblings, 0 replies; 2+ messages in thread
From: Prateek Saxena @ 2005-08-20 23:53 UTC (permalink / raw)
To: gcc
Sorry, my mistake. I initialized it with a value, and it appeared in
the .data. :)
> Hi,
>
> I am trying to implement a prototype pass that instruments a function
> to check for safe memory accesses. As a starting point I looked at
> mudflap1 pass, in tree-mudflap.c and decided that I should write a
> dummy pass ( very simple, but similar to mudflap) that instruments the
> code to count the number of functions in the source file.
>
> I am unable to add a global variable in the file scope. The global
> VAR_DECL building function looks like this:
>
> {
> tree decl = build_decl (VAR_DECL, get_identifier ("my_var"),
> integer_type_node);
> TREE_PUBLIC (decl) = 0;
> DECL_EXTERNAL (decl) = 0;
> TREE_STATIC (decl) = 1;
> gimplify_stmt (my_variable);
> lang_hooks.decls.pushdecl (decl);
> return decl;
> }
>
> It is called from within my call-back function "execute_my_pass" ( as
> specified by me in the tree_opt_pass structure ).
>
> I increment "my_var" in every function. But, the instrumented object
> file doesnot have a storage allocated for this variable in the .data
> section. The problem is that DECL_CONTEXT of this VAR_DECL is always
> getting assigned to a function, and not to global file scope. Why is
> that?
>
> Any help would be appreciated.
>
> Thanks,
> Prateek.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Problem with instrumenting GIMPLE for adding a global variable
@ 2005-08-20 23:20 Prateek Saxena
0 siblings, 0 replies; 2+ messages in thread
From: Prateek Saxena @ 2005-08-20 23:20 UTC (permalink / raw)
To: gcc
Hi,
I am trying to implement a prototype pass that instruments a function
to check for safe memory accesses. As a starting point I looked at
mudflap1 pass, in tree-mudflap.c and decided that I should write a
dummy pass ( very simple, but similar to mudflap) that instruments the
code to count the number of functions in the source file.
I am unable to add a global variable in the file scope. The global
VAR_DECL building function looks like this:
{
tree decl = build_decl (VAR_DECL, get_identifier ("my_var"),
integer_type_node);
TREE_PUBLIC (decl) = 0;
DECL_EXTERNAL (decl) = 0;
TREE_STATIC (decl) = 1;
gimplify_stmt (my_variable);
lang_hooks.decls.pushdecl (decl);
return decl;
}
It is called from within my call-back function "execute_my_pass" ( as
specified by me in the tree_opt_pass structure ).
I increment "my_var" in every function. But, the instrumented object
file doesnot have a storage allocated for this variable in the .data
section. The problem is that DECL_CONTEXT of this VAR_DECL is always
getting assigned to a function, and not to global file scope. Why is
that?
Any help would be appreciated.
Thanks,
Prateek.
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