[gcc r12-8782] Fortran: error recovery on invalid ARRAY argument to FINDLOC [PR106986]

[Harald Anlauf]

https://gcc.gnu.org/g:84a34d76a76f27feabd4523e388068c90c2bb2e4

commit r12-8782-g84a34d76a76f27feabd4523e388068c90c2bb2e4
Author: Harald Anlauf <anlauf@gmx.de>
Date:   Tue Sep 20 22:41:48 2022 +0200

    Fortran: error recovery on invalid ARRAY argument to FINDLOC [PR106986]
    
    gcc/fortran/ChangeLog:
    
            PR fortran/106986
            * simplify.cc (gfc_simplify_findloc): Do not try to simplify
            intrinsic FINDLOC when the ARRAY argument has a NULL shape.
    
    gcc/testsuite/ChangeLog:
    
            PR fortran/106986
            * gfortran.dg/pr106986.f90: New test.
    
    (cherry picked from commit 5976fbf9d5dd9542fcb82eebb2185886fd52d000)

Diff:
---
 gcc/fortran/simplify.cc                | 1 +
 gcc/testsuite/gfortran.dg/pr106986.f90 | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/gcc/fortran/simplify.cc b/gcc/fortran/simplify.cc
index 0eff5a546cc..a6a3e94fbd9 100644
--- a/gcc/fortran/simplify.cc
+++ b/gcc/fortran/simplify.cc
@@ -5857,6 +5857,7 @@ gfc_simplify_findloc (gfc_expr *array, gfc_expr *value, gfc_expr *dim,
   bool back_val = false;
 
   if (!is_constant_array_expr (array)
+      || array->shape == NULL
       || !gfc_is_constant_expr (dim))
     return NULL;
 
diff --git a/gcc/testsuite/gfortran.dg/pr106986.f90 b/gcc/testsuite/gfortran.dg/pr106986.f90
new file mode 100644
index 00000000000..a309b25d181
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/pr106986.f90
@@ -0,0 +1,8 @@
+! { dg-do compile }
+! PR fortran/106986 - ICE in simplify_findloc_nodim
+! Contributed by G.Steinmetz
+
+program p
+  integer, parameter :: a(:) = [1] ! { dg-error "deferred shape" }
+  print *, findloc (a, 1)
+end