* [Patch, fortran] PR96624 - A segment fault occurred when using the reshape function result to assign a variable
@ 2020-08-27 6:17 Paul Richard Thomas
2020-08-27 7:46 ` Tobias Burnus
0 siblings, 1 reply; 2+ messages in thread
From: Paul Richard Thomas @ 2020-08-27 6:17 UTC (permalink / raw)
To: fortran, gcc-patches
[-- Attachment #1: Type: text/plain, Size: 739 bytes --]
Hi All,
Here is another of Steve Kargl's patches.
Before the patch is applied, the following code is generated:
atmp.0.span = 4;
atmp.0.data = 0B;
atmp.0.offset = 0;
(*(integer(kind=4)[0] * restrict) atmp.0.data)[0] = 1;
(*(integer(kind=4)[0] * restrict) atmp.0.data)[1] = 2;
which causes a segfault at run time. The test case counts the number of
occurrences of 'data' to check that the bad assignments have gone.
Regtests OK on FC31/x86_64 - OK for aster?
This patch fixes PR96624.
2020-08-27 Paul Thomas <pault@gcc.gnu.org>
gcc/fortran
PR fortran/96624
* simplify.c (gfc_simplify_reshape): Detect zero shape and
clear index if found.
gcc/testsuite/
PR fortran/96624
* gfortran.dg/reshape_8.f90 : New test.
[-- Attachment #2: submit.diff --]
[-- Type: text/x-patch, Size: 1172 bytes --]
diff --git a/gcc/fortran/simplify.c b/gcc/fortran/simplify.c
index 074b50c2e68..8e0d2f97a60 100644
--- a/gcc/fortran/simplify.c
+++ b/gcc/fortran/simplify.c
@@ -6398,7 +6398,7 @@ gfc_simplify_is_contiguous (gfc_expr *array)
if (gfc_is_not_contiguous (array))
return gfc_get_logical_expr (gfc_default_logical_kind, &array->where, 0);
-
+
return NULL;
}
@@ -6725,6 +6725,7 @@ gfc_simplify_reshape (gfc_expr *source, gfc_expr *shape_exp,
unsigned long j;
size_t nsource;
gfc_expr *e, *result;
+ bool zerosize = false;
/* Check that argument expression types are OK. */
if (!is_constant_array_expr (source)
@@ -6847,7 +6848,14 @@ gfc_simplify_reshape (gfc_expr *source, gfc_expr *shape_exp,
result->rank = rank;
result->shape = gfc_get_shape (rank);
for (i = 0; i < rank; i++)
- mpz_init_set_ui (result->shape[i], shape[i]);
+ {
+ mpz_init_set_ui (result->shape[i], shape[i]);
+ if (shape[i] == 0)
+ zerosize = true;
+ }
+
+ if (zerosize)
+ goto sizezero;
while (nsource > 0 || npad > 0)
{
@@ -6897,6 +6905,8 @@ inc:
break;
}
+sizezero:
+
mpz_clear (index);
return result;
[-- Attachment #3: pr96624.f90 --]
[-- Type: text/x-fortran, Size: 411 bytes --]
! { dg-do compile }
! { dg-options "-fdump-tree-original" }
!
! Test the fix for PR96624 in which an attempt was made to assign
! to the zero length temporary created by reshape, resulting in a segfault.
!
! Contributed by Dong Shenpo <shenpo.dong@compiler-dev.com>
!
program test
integer :: a(2,0)
a = reshape([1,2,3,4], [2,0])
print *, a
end
! { dg-final { scan-tree-dump-times "data" 3 "original" } }
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [Patch, fortran] PR96624 - A segment fault occurred when using the reshape function result to assign a variable
2020-08-27 6:17 [Patch, fortran] PR96624 - A segment fault occurred when using the reshape function result to assign a variable Paul Richard Thomas
@ 2020-08-27 7:46 ` Tobias Burnus
0 siblings, 0 replies; 2+ messages in thread
From: Tobias Burnus @ 2020-08-27 7:46 UTC (permalink / raw)
To: Paul Richard Thomas, fortran, gcc-patches
Looks good to me.
Thanks for the patch!
Tobias
On 8/27/20 8:17 AM, Paul Richard Thomas via Fortran wrote:
> Hi All,
>
> Here is another of Steve Kargl's patches.
>
> Before the patch is applied, the following code is generated:
> atmp.0.span = 4;
> atmp.0.data = 0B;
> atmp.0.offset = 0;
> (*(integer(kind=4)[0] * restrict) atmp.0.data)[0] = 1;
> (*(integer(kind=4)[0] * restrict) atmp.0.data)[1] = 2;
>
> which causes a segfault at run time. The test case counts the number of
> occurrences of 'data' to check that the bad assignments have gone.
>
> Regtests OK on FC31/x86_64 - OK for aster?
>
> This patch fixes PR96624.
>
> 2020-08-27 Paul Thomas <pault@gcc.gnu.org>
>
> gcc/fortran
> PR fortran/96624
> * simplify.c (gfc_simplify_reshape): Detect zero shape and
> clear index if found.
>
> gcc/testsuite/
> PR fortran/96624
> * gfortran.dg/reshape_8.f90 : New test.
-----------------
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