Hi all,
the patch attached fixes the use of an uninitialized variable for the string
length in the declaration of the char[1:_len] type (the _len!). The type for
save'd deferred length char arrays is now char*, so that there is no need for
the length in the type declaration anymore. The length is of course still
provided and needed later on.
I hope this fixes the ICE in the IPA: inline phase, because I never saw it. Is
that what you had in mind @Richard?
Regtests ok on x86_64-pc-linux-gnu/Fedora 39. Ok for mainline?
Regards,
Andre
--
Andre Vehreschild * Email: vehre ad gmx dot de
From 48f0a67b4ea241567f660052302f6f021778b232 Mon Sep 17 00:00:00 2001
From: Andre Vehreschild <ve...@gcc.gnu.org>
Date: Wed, 10 Jul 2024 14:37:37 +0200
Subject: [PATCH] Fortran: Use char* for deferred length character arrays
[PR82904]
Randomly during compiling the pass IPA: inline would ICE. This was
caused by a saved deferred length string. The length variable was not
set, but the variable was used in the array's declaration. Now using a
character pointer to prevent this.
gcc/fortran/ChangeLog:
* trans-types.cc (gfc_sym_type): Use type `char*` for saved
deferred length char arrays.
* trans.cc (get_array_span): Get `.span` also for `char*` typed
arrays, i.e. for those that have INTEGER_TYPE instead of
ARRAY_TYPE.
gcc/testsuite/ChangeLog:
* gfortran.dg/deferred_character_38.f90: New test.
---
gcc/fortran/trans-types.cc | 6 ++++--
gcc/fortran/trans.cc | 4 +++-
.../gfortran.dg/deferred_character_38.f90 | 20 +++++++++++++++++++
3 files changed, 27 insertions(+), 3 deletions(-)
create mode 100644 gcc/testsuite/gfortran.dg/deferred_character_38.f90
diff --git a/gcc/fortran/trans-types.cc b/gcc/fortran/trans-types.cc
index 42a7934db9d..c76cdca4eae 100644
--- a/gcc/fortran/trans-types.cc
+++ b/gcc/fortran/trans-types.cc
@@ -2320,8 +2320,10 @@ gfc_sym_type (gfc_symbol * sym, bool is_bind_c)
|| ((sym->attr.result || sym->attr.value)
&& sym->ns->proc_name
&& sym->ns->proc_name->attr.is_bind_c)
- || (sym->ts.deferred && (!sym->ts.u.cl
- || !sym->ts.u.cl->backend_decl))
+ || (sym->ts.deferred
+ && (!sym->ts.u.cl
+ || !sym->ts.u.cl->backend_decl
+ || sym->attr.save))
|| (sym->attr.dummy
&& sym->attr.value
&& gfc_length_one_character_type_p (&sym->ts))))
diff --git a/gcc/fortran/trans.cc b/gcc/fortran/trans.cc
index 1067e032621..d4c54093cbc 100644
--- a/gcc/fortran/trans.cc
+++ b/gcc/fortran/trans.cc
@@ -398,7 +398,9 @@ get_array_span (tree type, tree decl)
return gfc_conv_descriptor_span_get (decl);
/* Return the span for deferred character length array references. */
- if (type && TREE_CODE (type) == ARRAY_TYPE && TYPE_STRING_FLAG (type))
+ if (type
+ && (TREE_CODE (type) == ARRAY_TYPE || TREE_CODE (type) == INTEGER_TYPE)
+ && TYPE_STRING_FLAG (type))
{
if (TREE_CODE (decl) == PARM_DECL)
decl = build_fold_indirect_ref_loc (input_location, decl);
diff --git a/gcc/testsuite/gfortran.dg/deferred_character_38.f90 b/gcc/testsuite/gfortran.dg/deferred_character_38.f90
new file mode 100644
index 00000000000..d5a6c0e5013
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/deferred_character_38.f90
@@ -0,0 +1,20 @@
+! { dg-do run }
+
+! Check for PR fortran/82904
+! Contributed by G.Steinmetz <gs...@t-online.de>
+
+! This test checks that 'IPA pass: inline' passes.
+! The initial version of the testcase contained coarrays, which does not work
+! yet.
+
+program p
+ save
+ character(:), allocatable :: x
+ character(:), allocatable :: y
+ allocate (character(3) :: y)
+ allocate (x, source='abc')
+ y = x
+
+ if (y /= 'abc') stop 1
+end
+
--
2.45.2
