[PATCH] Fortran: improve error recovery while simplifying size of bad array [PR103694]

[Tobias Burnus]

Dear Harald,

On 23.08.22 22:29, Harald Anlauf via Fortran wrote:

the simplification of the size of an array with a bad decl
should not be successful.  Improve the error recovery for
such a situation.

[...]

Regtested on x86_64-pc-linux-gnu.
The PR is marked as a 12/13 regression.  Will therefore
commit to both.


LGTM – and thanks for taking care of the Fortran bugs!

Tobias

[PATCH] Fortran: improve error recovery while simplifying size of bad array [PR103694]

gcc/fortran/ChangeLog:

        PR fortran/103694
        * simplify.cc (simplify_size): The size expression of an array cannot
        be simplified if an error occurs while resolving the array spec.

gcc/testsuite/ChangeLog:

        PR fortran/103694
        * gfortran.dg/pr103694.f90: New test.
---
 gcc/fortran/simplify.cc                |  5 +++--
 gcc/testsuite/gfortran.dg/pr103694.f90 | 11 +++++++++++
 2 files changed, 14 insertions(+), 2 deletions(-)
 create mode 100644 gcc/testsuite/gfortran.dg/pr103694.f90

diff --git a/gcc/fortran/simplify.cc b/gcc/fortran/simplify.cc
index f992c31e5d7..bc178d54891 100644
--- a/gcc/fortran/simplify.cc
+++ b/gcc/fortran/simplify.cc
@@ -7536,8 +7536,9 @@ simplify_size (gfc_expr *array, gfc_expr *dim, int k)
     }

   for (ref = array->ref; ref; ref = ref->next)
-    if (ref->type == REF_ARRAY && ref->u.ar.as)
-      gfc_resolve_array_spec (ref->u.ar.as, 0);
+    if (ref->type == REF_ARRAY && ref->u.ar.as
+       && !gfc_resolve_array_spec (ref->u.ar.as, 0))
+      return NULL;

   if (dim == NULL)
     {
diff --git a/gcc/testsuite/gfortran.dg/pr103694.f90 b/gcc/testsuite/gfortran.dg/pr103694.f90
new file mode 100644
index 00000000000..3ed8b2088da
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/pr103694.f90
@@ -0,0 +1,11 @@
+! { dg-do compile }
+! PR fortran/103694 - ICE in gfc_conv_expr_op
+! Contributed by G.Steinmetz
+
+subroutine s
+  type t
+     integer :: a(2)
+  end type
+  type(t) :: x((0.)/0)
+  integer :: n = size(x(1)%a) ! { dg-error "does not reduce to a constant expression" }
+end


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