Inserting instrument calls before and after a function
Hi I am working on modifying gcc so that I can add custom functions before the start and after the end of every function call in gcc. Much liek __cyg_profile_func_enter and exit but not when the function call has already been made. Is there a easy way to do it? I was concentrating on modifying the gimplify_function_tree in gimplify.c but that isnt working good for me. Can somebody put a snippet on how I can go about doing it. Any help would be appreciated. Thank you. ps: I am seriously liking this challenging domain of working on gcc. Thanks to all you guys! -- Regards, Saleel Kudchadker Graduate Student School of Computing , Informatics and Decision Systems Arizona State University
Segfault inserting a pass
Hi I am working on calling the instrument function before every
function call automatically. I tried inserting this pass which would
add my function to every edge
//
static unsigned int spmm_insert(void){
struct cgraph_edge *e;
struct cgraph_node *node = cgraph_node (current_function_decl);
tree x, bind,spmm_type,spmm_decl,ctr_ptr;
x = implicit_built_in_decls[BUILT_IN_PROFILE_FUNC_ENTER];
x = build_call_expr (x, 0);
for (e = node->callees; e; e = e->next_callee){
bsi_insert_on_edge(e, x);
}
/***/
This throws me a Segfault error when compiling the code. i am applying
this pass before pass_apply_inline in passes.c
I am new to GCC, Can someone hint me documents or materials I can look
upon to insert this pass.
--
Regards,
Saleel Kudchadker
Graduate Student
School of Computing , Informatics and Decision Systems
Arizona State University
Adding a statement to statement list before pass_cfg_build
Hi
I've been trying to add a statement before the statement list before
the basic blocks are created. I am planning to add a function call
statement before a user function is called and I use the instrument
function definition as a statement . The code and the pass compiles
properly but no function is called when the actual program runs.
Can someone hint me where I am going wrong?
static void spmm_init_function(tree *tp)
{
tree func_decl;
tree x,spmm_decl,bind;
tree_stmt_iterator i = tsi_start (*tp);
tree_stmt_iterator last_i;
tree stmt=NULL;
enum tree_code code;
while (!tsi_end_p (i))
{
tree prev_stmt;
prev_stmt = stmt;
stmt = tsi_stmt (i);
code = TREE_CODE (stmt);
switch (code)
{
case CALL_EXPR:
print_
x = implicit_built_in_decls[BUILT_IN_PROFILE_FUNC_ENTER];
x = build_call_expr (x, 0);
tsi_link_after(&i,x,TSI_NEW_STMT);
break;
default:
break;
}
tsi_next(&i);
}
}
--
Regards,
Saleel Kudchadker
Graduate Student
School of Computing , Informatics and Decision Systems
Arizona State University
Re: Adding a statement to statement list before pass_cfg_build
Thank you Richard. I think I will try to add them on the edges once
the basic blocks are created.
On Fri, Feb 19, 2010 at 12:19 PM, Richard Guenther
wrote:
> On Fri, Feb 19, 2010 at 8:07 PM, Saleel Kudchadker wrote:
>> Hi
>>
>> I've been trying to add a statement before the statement list before
>> the basic blocks are created. I am planning to add a function call
>> statement before a user function is called and I use the instrument
>> function definition as a statement . The code and the pass compiles
>> properly but no function is called when the actual program runs.
>>
>> Can someone hint me where I am going wrong?
>
> Before CFG creation we are in gimple and inserting trees to the
> tree stmt list is useless.
>
>>
>> static void spmm_init_function(tree *tp)
>> {
>> tree func_decl;
>> tree x,spmm_decl,bind;
>> tree_stmt_iterator i = tsi_start (*tp);
>> tree_stmt_iterator last_i;
>> tree stmt=NULL;
>> enum tree_code code;
>>while (!tsi_end_p (i))
>>{
>> tree prev_stmt;
>>
>> prev_stmt = stmt;
>> stmt = tsi_stmt (i);
>> code = TREE_CODE (stmt);
>> switch (code)
>> {
>>case CALL_EXPR:
>>print_
>>x = implicit_built_in_decls[BUILT_IN_PROFILE_FUNC_ENTER];
>>x = build_call_expr (x, 0);
>> tsi_link_after(&i,x,TSI_NEW_STMT);
>>break;
>>
>>default:
>> break;
>>}
>>tsi_next(&i);
>> }
>>
>> }
>>
>> --
>> Regards,
>>
>> Saleel Kudchadker
>> Graduate Student
>> School of Computing , Informatics and Decision Systems
>> Arizona State University
>>
>
--
Regards,
Saleel Kudchadker
Graduate Teaching Assistant
School of Computing , Informatics and Decision Systems
Arizona State University
Adding function calls before and after a CALL_EXPR
Hi
I am trying to add two function calls before and after a CALL_EXPR
To do this I use bsi_insert_before and bsi_insert_after
But I am having an issue having both of these working in the same pass.
I can make bsi_insert_before or bsi_insert_after work independently.
To make them work together I use
if (fndecl)
{
bsi_insert_before (&block_iterator1, fndecl, BSI_SAME_STMT);
}
if (fndecl2)
{
bsi_insert_after (&block_iterator1, fndecl2, BSI_NEW_STMT);
}
in the basic block iterator loop
Can someone suggest what may be going wrong?
--
Regards,
Saleel Kudchadker
Graduate Student
School of Computing , Informatics and Decision Systems
Arizona State University
