* How do I print the name of a variable created with create_tmp_var_raw
@ 2020-12-08 18:34 Thomas Koenig
2020-12-08 19:48 ` Tobias Burnus
0 siblings, 1 reply; 3+ messages in thread
From: Thomas Koenig @ 2020-12-08 18:34 UTC (permalink / raw)
To: gcc, fortran
Hi,
I would like to know the name of a variable created with
create_tmp_var_raw, but it is not clear to my how to do it.
gimple_decl_printable_name sounded like a likely candidate,
but that just returns a null pointer. Any combination of
IDENTIFIER_POINTER and DECL_NAME that I tried also led to
checking errors or segfaults.
More specifically,
diff --git a/gcc/fortran/trans.c b/gcc/fortran/trans.c
index f1c8f0ee17f..11043406840 100644
--- a/gcc/fortran/trans.c
+++ b/gcc/fortran/trans.c
@@ -96,7 +96,7 @@ gfc_create_var_np (tree type, const char *prefix)
tree t;
t = create_tmp_var_raw (type, prefix);
-
+ dprintf (2, "%s\n", IDENTIFIER_POINTER (DECL_NAME (t)));
/* No warnings for anonymous variables. */
if (prefix == NULL)
TREE_NO_WARNING (t) = 1;
which I thought should work according to the documentation I've
read resulted in a segfault.
Any pointers? Is there a magic incantation that I am missing?
Best regards
Thomas
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: How do I print the name of a variable created with create_tmp_var_raw
2020-12-08 18:34 How do I print the name of a variable created with create_tmp_var_raw Thomas Koenig
@ 2020-12-08 19:48 ` Tobias Burnus
2020-12-08 20:39 ` Thomas Koenig
0 siblings, 1 reply; 3+ messages in thread
From: Tobias Burnus @ 2020-12-08 19:48 UTC (permalink / raw)
To: Thomas Koenig, gcc, fortran
Hi Thomas,
On 08.12.20 19:34, Thomas Koenig via Fortran wrote:
> I would like to know the name of a variable created with
> create_tmp_var_raw, but it is not clear to my how to do it.
> ...
> t = create_tmp_var_raw (type, prefix);
> -
> + dprintf (2, "%s\n", IDENTIFIER_POINTER (DECL_NAME (t)));
I think that's okay. However:
Do you have a prefix or not?
If there is no prefix, DECL_NAME (t) == NULL.
If there is a prefix, the name is create_tmp_var_name (prefix),
which is (on most systems) "%s.%d", prefix, tmp_var_id_num++
Otherwise, the D.1234 you see in the dump is mostly the result of
"D.%u", DECL_UID (t).
I hope it helps,
Tobias
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: How do I print the name of a variable created with create_tmp_var_raw
2020-12-08 19:48 ` Tobias Burnus
@ 2020-12-08 20:39 ` Thomas Koenig
0 siblings, 0 replies; 3+ messages in thread
From: Thomas Koenig @ 2020-12-08 20:39 UTC (permalink / raw)
To: Tobias Burnus, gcc, fortran
Hi Tobias,
> On 08.12.20 19:34, Thomas Koenig via Fortran wrote:
>> I would like to know the name of a variable created with
>> create_tmp_var_raw, but it is not clear to my how to do it.
>> ...
>> t = create_tmp_var_raw (type, prefix);
>> -
>> + dprintf (2, "%s\n", IDENTIFIER_POINTER (DECL_NAME (t)));
>
> I think that's okay. However:
>
> Do you have a prefix or not?
>
> If there is no prefix, DECL_NAME (t) == NULL.
>
> If there is a prefix, the name is create_tmp_var_name (prefix),
> which is (on most systems) "%s.%d", prefix, tmp_var_id_num++
>
> Otherwise, the D.1234 you see in the dump is mostly the result of
> "D.%u", DECL_UID (t).
Yes, this clears up things. Thanks!
I am currently trying to figure out better ways of debugging
generated code (PR 90207) and one thing is to make intermediate
variables visible to the debugger, of course under control of
a special flag. The dot is of course not a good choice beause
gdb will not print a variable called S.0, but maybe a @ will work.
Or, less amitious, sometimes it is hard to see by which path a
certain variable is generated. Being able to set a breakpoint
where a certain variable is being generated can help a lot.
Best regards
Thomas
^ permalink raw reply [flat|nested] 3+ messages in thread
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