* [Patch, fortran] PR99125 - [9/10/11 Regression] ICE: gimplification failed (gimplify.c:15068)
@ 2021-02-24 14:05 Paul Richard Thomas
2021-02-24 16:28 ` Tobias Burnus
0 siblings, 1 reply; 2+ messages in thread
From: Paul Richard Thomas @ 2021-02-24 14:05 UTC (permalink / raw)
To: fortran, gcc-patches; +Cc: gerhard.steinmetz.fortran
[-- Attachment #1: Type: text/plain, Size: 1047 bytes --]
This problem was caused by the compiler attempting to use 0 as an lvalue
and to assign 0 to it. Understandably, this upset the gimplifer quite a bit
:-) The fix is to use the ss_info string length for deferred length
character components, where the hidden string length component has been
used. The use of a constant as an lvalue is prevented by checking that the
expression string length is a variable.
Regtests on FC33/x86_64 - OK for all three branches?
Paul
Fortran: Fix for class defined operators [PR99125].
2021-02-23 Paul Thomas <pault@gcc.gnu.org>
gcc/fortran
PR fortran/99125
* trans-array.c (gfc_conv_expr_descriptor): For deferred length
length components use the ss_info string length instead of
gfc_get_expr_charlen. Make sure that the deferred string length
is a variable before assigning to it. Otherwise use the expr.
* trans-expr.c (gfc_conv_string_length): Make sure that the
deferred string length is a variable before assigning to it.
gcc/testsuite/
PR fortran/99125
* gfortran.dg/alloc_deferred_comp_1.f90: New test.
[-- Attachment #2: submit.diff --]
[-- Type: text/x-patch, Size: 1595 bytes --]
diff --git a/gcc/fortran/trans-array.c b/gcc/fortran/trans-array.c
index c6725659093..e85d63c3539 100644
--- a/gcc/fortran/trans-array.c
+++ b/gcc/fortran/trans-array.c
@@ -7670,15 +7670,21 @@ gfc_conv_expr_descriptor (gfc_se *se, gfc_expr *expr)
/* Set the string_length for a character array. */
if (expr->ts.type == BT_CHARACTER)
{
- se->string_length = gfc_get_expr_charlen (expr);
+ if (deferred_array_component)
+ se->string_length = ss_info->string_length;
+ else
+ se->string_length = gfc_get_expr_charlen (expr);
+
if (VAR_P (se->string_length)
&& expr->ts.u.cl->backend_decl == se->string_length)
tmp = ss_info->string_length;
else
tmp = se->string_length;
- if (expr->ts.deferred)
+ if (expr->ts.deferred && VAR_P (expr->ts.u.cl->backend_decl))
gfc_add_modify (&se->pre, expr->ts.u.cl->backend_decl, tmp);
+ else
+ expr->ts.u.cl->backend_decl = tmp;
}
/* If we have an array section, are assigning or passing an array
diff --git a/gcc/fortran/trans-expr.c b/gcc/fortran/trans-expr.c
index e61492485b8..9d178360fc3 100644
--- a/gcc/fortran/trans-expr.c
+++ b/gcc/fortran/trans-expr.c
@@ -2471,7 +2471,7 @@ gfc_conv_string_length (gfc_charlen * cl, gfc_expr * expr, stmtblock_t * pblock)
se.expr, build_zero_cst (TREE_TYPE (se.expr)));
gfc_add_block_to_block (pblock, &se.pre);
- if (cl->backend_decl)
+ if (cl->backend_decl && VAR_P (cl->backend_decl))
gfc_add_modify (pblock, cl->backend_decl, se.expr);
else
cl->backend_decl = gfc_evaluate_now (se.expr, pblock);
[-- Attachment #3: alloc_deferred_comp_1.f90 --]
[-- Type: text/x-fortran, Size: 542 bytes --]
! { dg-do run }
!
! Test the fix for PR99125, where the array reference in the print
! statement caused an ICE because the gimplifier complained about '0'
! being used as an lvalue.
!
! Contributed by Gerhard Steinmetz <gscfq@t-online.de>
!
program p
type t
character(:), allocatable :: a(:)
end type
type(t) :: x
character(8) :: c(3) = ['12 45 78','23 56 89','34 67 90']
x%a = c
if (any (x%a(2:3) .ne. ['23 56 89','34 67 90'])) stop 1
if (any (x%a(2:3)(4:5) .ne. ['56','67'])) stop 2 ! Bizarrely this worked.
end
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [Patch, fortran] PR99125 - [9/10/11 Regression] ICE: gimplification failed (gimplify.c:15068)
2021-02-24 14:05 [Patch, fortran] PR99125 - [9/10/11 Regression] ICE: gimplification failed (gimplify.c:15068) Paul Richard Thomas
@ 2021-02-24 16:28 ` Tobias Burnus
0 siblings, 0 replies; 2+ messages in thread
From: Tobias Burnus @ 2021-02-24 16:28 UTC (permalink / raw)
To: Paul Richard Thomas, fortran, gcc-patches; +Cc: gerhard.steinmetz.fortran
Hi Paul,
On 24.02.21 15:05, Paul Richard Thomas via Fortran wrote:
> This problem was caused by the compiler attempting to use 0 as an lvalue
> and to assign 0 to it.
I did recall the problem – and indeed: PR95868.
The trans-array.c patch does effectively the same as mine there, some
other use of 'tmp' but otherwise ...
The trans-expr patch, I didn't have; unfortunately, it does not solve
the other issues of my PR, either. (Thus, if you are interested in
continuing the len=: work ...)
[Once that PR is fixed, trans-openmp.c has to updated for it as well.]
> Understandably, this upset the gimplifer quite a bit
> :-) The fix is to use the ss_info string length for deferred length
> character components, where the hidden string length component has been
> used. The use of a constant as an lvalue is prevented by checking that the
> expression string length is a variable.
>
> Regtests on FC33/x86_64 - OK for all three branches?
LGTM.
Thanks for the patch!
Tobias
> Fortran: Fix for class defined operators [PR99125].
>
> 2021-02-23 Paul Thomas <pault@gcc.gnu.org>
>
> gcc/fortran
> PR fortran/99125
> * trans-array.c (gfc_conv_expr_descriptor): For deferred length
> length components use the ss_info string length instead of
> gfc_get_expr_charlen. Make sure that the deferred string length
> is a variable before assigning to it. Otherwise use the expr.
> * trans-expr.c (gfc_conv_string_length): Make sure that the
> deferred string length is a variable before assigning to it.
>
> gcc/testsuite/
> PR fortran/99125
> * gfortran.dg/alloc_deferred_comp_1.f90: New test.
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2021-02-24 14:05 [Patch, fortran] PR99125 - [9/10/11 Regression] ICE: gimplification failed (gimplify.c:15068) Paul Richard Thomas
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